Commit | Line | Data |
---|---|---|
ed9a39eb | 1 | /* Common target dependent code for GDB on ARM systems. |
0fd88904 | 2 | |
b811d2c2 | 3 | Copyright (C) 1988-2020 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 19 | |
0baeab03 PA |
20 | #include "defs.h" |
21 | ||
4de283e4 | 22 | #include <ctype.h> /* XXX for isupper (). */ |
34e8f22d | 23 | |
4de283e4 TT |
24 | #include "frame.h" |
25 | #include "inferior.h" | |
26 | #include "infrun.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
29 | #include "dis-asm.h" /* For register styles. */ | |
30 | #include "disasm.h" | |
31 | #include "regcache.h" | |
32 | #include "reggroups.h" | |
33 | #include "target-float.h" | |
34 | #include "value.h" | |
d55e5aa6 | 35 | #include "arch-utils.h" |
4de283e4 TT |
36 | #include "osabi.h" |
37 | #include "frame-unwind.h" | |
38 | #include "frame-base.h" | |
39 | #include "trad-frame.h" | |
40 | #include "objfiles.h" | |
82ca8957 | 41 | #include "dwarf2/frame.h" |
4de283e4 TT |
42 | #include "gdbtypes.h" |
43 | #include "prologue-value.h" | |
44 | #include "remote.h" | |
45 | #include "target-descriptions.h" | |
46 | #include "user-regs.h" | |
47 | #include "observable.h" | |
5f661e03 | 48 | #include "count-one-bits.h" |
4de283e4 | 49 | |
d55e5aa6 | 50 | #include "arch/arm.h" |
4de283e4 | 51 | #include "arch/arm-get-next-pcs.h" |
34e8f22d | 52 | #include "arm-tdep.h" |
4de283e4 TT |
53 | #include "gdb/sim-arm.h" |
54 | ||
d55e5aa6 | 55 | #include "elf-bfd.h" |
4de283e4 | 56 | #include "coff/internal.h" |
d55e5aa6 | 57 | #include "elf/arm.h" |
4de283e4 | 58 | |
4de283e4 TT |
59 | #include "record.h" |
60 | #include "record-full.h" | |
61 | #include <algorithm> | |
62 | ||
c2fd7fae AKS |
63 | #include "producer.h" |
64 | ||
b121eeb9 | 65 | #if GDB_SELF_TEST |
268a13a5 | 66 | #include "gdbsupport/selftest.h" |
b121eeb9 YQ |
67 | #endif |
68 | ||
491144b5 | 69 | static bool arm_debug; |
6529d2dd | 70 | |
082fc60d RE |
71 | /* Macros for setting and testing a bit in a minimal symbol that marks |
72 | it as Thumb function. The MSB of the minimal symbol's "info" field | |
f594e5e9 | 73 | is used for this purpose. |
082fc60d RE |
74 | |
75 | MSYMBOL_SET_SPECIAL Actually sets the "special" bit. | |
f594e5e9 | 76 | MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */ |
082fc60d | 77 | |
0963b4bd | 78 | #define MSYMBOL_SET_SPECIAL(msym) \ |
b887350f | 79 | MSYMBOL_TARGET_FLAG_1 (msym) = 1 |
082fc60d RE |
80 | |
81 | #define MSYMBOL_IS_SPECIAL(msym) \ | |
b887350f | 82 | MSYMBOL_TARGET_FLAG_1 (msym) |
082fc60d | 83 | |
60c5725c DJ |
84 | struct arm_mapping_symbol |
85 | { | |
227031b2 | 86 | CORE_ADDR value; |
60c5725c | 87 | char type; |
54cc7474 SM |
88 | |
89 | bool operator< (const arm_mapping_symbol &other) const | |
90 | { return this->value < other.value; } | |
60c5725c | 91 | }; |
54cc7474 SM |
92 | |
93 | typedef std::vector<arm_mapping_symbol> arm_mapping_symbol_vec; | |
60c5725c | 94 | |
bd5766ec | 95 | struct arm_per_bfd |
60c5725c | 96 | { |
bd5766ec | 97 | explicit arm_per_bfd (size_t num_sections) |
4838e44c SM |
98 | : section_maps (new arm_mapping_symbol_vec[num_sections]), |
99 | section_maps_sorted (new bool[num_sections] ()) | |
54cc7474 SM |
100 | {} |
101 | ||
bd5766ec | 102 | DISABLE_COPY_AND_ASSIGN (arm_per_bfd); |
54cc7474 SM |
103 | |
104 | /* Information about mapping symbols ($a, $d, $t) in the objfile. | |
105 | ||
106 | The format is an array of vectors of arm_mapping_symbols, there is one | |
107 | vector for each section of the objfile (the array is index by BFD section | |
108 | index). | |
109 | ||
110 | For each section, the vector of arm_mapping_symbol is sorted by | |
111 | symbol value (address). */ | |
112 | std::unique_ptr<arm_mapping_symbol_vec[]> section_maps; | |
4838e44c SM |
113 | |
114 | /* For each corresponding element of section_maps above, is this vector | |
115 | sorted. */ | |
116 | std::unique_ptr<bool[]> section_maps_sorted; | |
60c5725c DJ |
117 | }; |
118 | ||
bd5766ec LM |
119 | /* Per-bfd data used for mapping symbols. */ |
120 | static bfd_key<arm_per_bfd> arm_bfd_data_key; | |
1b7f24cd | 121 | |
afd7eef0 RE |
122 | /* The list of available "set arm ..." and "show arm ..." commands. */ |
123 | static struct cmd_list_element *setarmcmdlist = NULL; | |
124 | static struct cmd_list_element *showarmcmdlist = NULL; | |
125 | ||
fd50bc42 RE |
126 | /* The type of floating-point to use. Keep this in sync with enum |
127 | arm_float_model, and the help string in _initialize_arm_tdep. */ | |
40478521 | 128 | static const char *const fp_model_strings[] = |
fd50bc42 RE |
129 | { |
130 | "auto", | |
131 | "softfpa", | |
132 | "fpa", | |
133 | "softvfp", | |
28e97307 DJ |
134 | "vfp", |
135 | NULL | |
fd50bc42 RE |
136 | }; |
137 | ||
138 | /* A variable that can be configured by the user. */ | |
139 | static enum arm_float_model arm_fp_model = ARM_FLOAT_AUTO; | |
140 | static const char *current_fp_model = "auto"; | |
141 | ||
28e97307 | 142 | /* The ABI to use. Keep this in sync with arm_abi_kind. */ |
40478521 | 143 | static const char *const arm_abi_strings[] = |
28e97307 DJ |
144 | { |
145 | "auto", | |
146 | "APCS", | |
147 | "AAPCS", | |
148 | NULL | |
149 | }; | |
150 | ||
151 | /* A variable that can be configured by the user. */ | |
152 | static enum arm_abi_kind arm_abi_global = ARM_ABI_AUTO; | |
153 | static const char *arm_abi_string = "auto"; | |
154 | ||
0428b8f5 | 155 | /* The execution mode to assume. */ |
40478521 | 156 | static const char *const arm_mode_strings[] = |
0428b8f5 DJ |
157 | { |
158 | "auto", | |
159 | "arm", | |
68770265 MGD |
160 | "thumb", |
161 | NULL | |
0428b8f5 DJ |
162 | }; |
163 | ||
164 | static const char *arm_fallback_mode_string = "auto"; | |
165 | static const char *arm_force_mode_string = "auto"; | |
166 | ||
f32bf4a4 YQ |
167 | /* The standard register names, and all the valid aliases for them. Note |
168 | that `fp', `sp' and `pc' are not added in this alias list, because they | |
169 | have been added as builtin user registers in | |
170 | std-regs.c:_initialize_frame_reg. */ | |
123dc839 DJ |
171 | static const struct |
172 | { | |
173 | const char *name; | |
174 | int regnum; | |
175 | } arm_register_aliases[] = { | |
176 | /* Basic register numbers. */ | |
177 | { "r0", 0 }, | |
178 | { "r1", 1 }, | |
179 | { "r2", 2 }, | |
180 | { "r3", 3 }, | |
181 | { "r4", 4 }, | |
182 | { "r5", 5 }, | |
183 | { "r6", 6 }, | |
184 | { "r7", 7 }, | |
185 | { "r8", 8 }, | |
186 | { "r9", 9 }, | |
187 | { "r10", 10 }, | |
188 | { "r11", 11 }, | |
189 | { "r12", 12 }, | |
190 | { "r13", 13 }, | |
191 | { "r14", 14 }, | |
192 | { "r15", 15 }, | |
193 | /* Synonyms (argument and variable registers). */ | |
194 | { "a1", 0 }, | |
195 | { "a2", 1 }, | |
196 | { "a3", 2 }, | |
197 | { "a4", 3 }, | |
198 | { "v1", 4 }, | |
199 | { "v2", 5 }, | |
200 | { "v3", 6 }, | |
201 | { "v4", 7 }, | |
202 | { "v5", 8 }, | |
203 | { "v6", 9 }, | |
204 | { "v7", 10 }, | |
205 | { "v8", 11 }, | |
206 | /* Other platform-specific names for r9. */ | |
207 | { "sb", 9 }, | |
208 | { "tr", 9 }, | |
209 | /* Special names. */ | |
210 | { "ip", 12 }, | |
123dc839 | 211 | { "lr", 14 }, |
123dc839 DJ |
212 | /* Names used by GCC (not listed in the ARM EABI). */ |
213 | { "sl", 10 }, | |
123dc839 DJ |
214 | /* A special name from the older ATPCS. */ |
215 | { "wr", 7 }, | |
216 | }; | |
bc90b915 | 217 | |
123dc839 | 218 | static const char *const arm_register_names[] = |
da59e081 JM |
219 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
220 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ | |
221 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ | |
222 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ | |
223 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ | |
224 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ | |
94c30b78 | 225 | "fps", "cpsr" }; /* 24 25 */ |
ed9a39eb | 226 | |
65b48a81 PB |
227 | /* Holds the current set of options to be passed to the disassembler. */ |
228 | static char *arm_disassembler_options; | |
229 | ||
afd7eef0 RE |
230 | /* Valid register name styles. */ |
231 | static const char **valid_disassembly_styles; | |
ed9a39eb | 232 | |
afd7eef0 RE |
233 | /* Disassembly style to use. Default to "std" register names. */ |
234 | static const char *disassembly_style; | |
96baa820 | 235 | |
d105cce5 AH |
236 | /* All possible arm target descriptors. */ |
237 | static struct target_desc *tdesc_arm_list[ARM_FP_TYPE_INVALID]; | |
238 | static struct target_desc *tdesc_arm_mprofile_list[ARM_M_TYPE_INVALID]; | |
239 | ||
ed9a39eb | 240 | /* This is used to keep the bfd arch_info in sync with the disassembly |
afd7eef0 | 241 | style. */ |
eb4c3f4a | 242 | static void set_disassembly_style_sfunc (const char *, int, |
ed9a39eb | 243 | struct cmd_list_element *); |
65b48a81 PB |
244 | static void show_disassembly_style_sfunc (struct ui_file *, int, |
245 | struct cmd_list_element *, | |
246 | const char *); | |
ed9a39eb | 247 | |
05d1431c | 248 | static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch, |
849d0ba8 | 249 | readable_regcache *regcache, |
05d1431c | 250 | int regnum, gdb_byte *buf); |
58d6951d DJ |
251 | static void arm_neon_quad_write (struct gdbarch *gdbarch, |
252 | struct regcache *regcache, | |
253 | int regnum, const gdb_byte *buf); | |
254 | ||
e7cf25a8 | 255 | static CORE_ADDR |
553cb527 | 256 | arm_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self); |
e7cf25a8 YQ |
257 | |
258 | ||
d9311bfa AT |
259 | /* get_next_pcs operations. */ |
260 | static struct arm_get_next_pcs_ops arm_get_next_pcs_ops = { | |
261 | arm_get_next_pcs_read_memory_unsigned_integer, | |
262 | arm_get_next_pcs_syscall_next_pc, | |
263 | arm_get_next_pcs_addr_bits_remove, | |
ed443b61 YQ |
264 | arm_get_next_pcs_is_thumb, |
265 | NULL, | |
d9311bfa AT |
266 | }; |
267 | ||
9b8d791a | 268 | struct arm_prologue_cache |
c3b4394c | 269 | { |
eb5492fa DJ |
270 | /* The stack pointer at the time this frame was created; i.e. the |
271 | caller's stack pointer when this function was called. It is used | |
272 | to identify this frame. */ | |
273 | CORE_ADDR prev_sp; | |
274 | ||
4be43953 DJ |
275 | /* The frame base for this frame is just prev_sp - frame size. |
276 | FRAMESIZE is the distance from the frame pointer to the | |
277 | initial stack pointer. */ | |
eb5492fa | 278 | |
c3b4394c | 279 | int framesize; |
eb5492fa DJ |
280 | |
281 | /* The register used to hold the frame pointer for this frame. */ | |
c3b4394c | 282 | int framereg; |
eb5492fa DJ |
283 | |
284 | /* Saved register offsets. */ | |
285 | struct trad_frame_saved_reg *saved_regs; | |
c3b4394c | 286 | }; |
ed9a39eb | 287 | |
0d39a070 DJ |
288 | static CORE_ADDR arm_analyze_prologue (struct gdbarch *gdbarch, |
289 | CORE_ADDR prologue_start, | |
290 | CORE_ADDR prologue_end, | |
291 | struct arm_prologue_cache *cache); | |
292 | ||
cca44b1b JB |
293 | /* Architecture version for displaced stepping. This effects the behaviour of |
294 | certain instructions, and really should not be hard-wired. */ | |
295 | ||
296 | #define DISPLACED_STEPPING_ARCH_VERSION 5 | |
297 | ||
c7ae7675 | 298 | /* See arm-tdep.h. */ |
c906108c | 299 | |
491144b5 | 300 | bool arm_apcs_32 = true; |
c906108c | 301 | |
9779414d DJ |
302 | /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */ |
303 | ||
478fd957 | 304 | int |
9779414d DJ |
305 | arm_psr_thumb_bit (struct gdbarch *gdbarch) |
306 | { | |
307 | if (gdbarch_tdep (gdbarch)->is_m) | |
308 | return XPSR_T; | |
309 | else | |
310 | return CPSR_T; | |
311 | } | |
312 | ||
d0e59a68 AT |
313 | /* Determine if the processor is currently executing in Thumb mode. */ |
314 | ||
315 | int | |
316 | arm_is_thumb (struct regcache *regcache) | |
317 | { | |
318 | ULONGEST cpsr; | |
ac7936df | 319 | ULONGEST t_bit = arm_psr_thumb_bit (regcache->arch ()); |
d0e59a68 AT |
320 | |
321 | cpsr = regcache_raw_get_unsigned (regcache, ARM_PS_REGNUM); | |
322 | ||
323 | return (cpsr & t_bit) != 0; | |
324 | } | |
325 | ||
b39cc962 DJ |
326 | /* Determine if FRAME is executing in Thumb mode. */ |
327 | ||
25b41d01 | 328 | int |
b39cc962 DJ |
329 | arm_frame_is_thumb (struct frame_info *frame) |
330 | { | |
331 | CORE_ADDR cpsr; | |
9779414d | 332 | ULONGEST t_bit = arm_psr_thumb_bit (get_frame_arch (frame)); |
b39cc962 DJ |
333 | |
334 | /* Every ARM frame unwinder can unwind the T bit of the CPSR, either | |
335 | directly (from a signal frame or dummy frame) or by interpreting | |
336 | the saved LR (from a prologue or DWARF frame). So consult it and | |
337 | trust the unwinders. */ | |
338 | cpsr = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
339 | ||
9779414d | 340 | return (cpsr & t_bit) != 0; |
b39cc962 DJ |
341 | } |
342 | ||
f9d67f43 DJ |
343 | /* Search for the mapping symbol covering MEMADDR. If one is found, |
344 | return its type. Otherwise, return 0. If START is non-NULL, | |
345 | set *START to the location of the mapping symbol. */ | |
c906108c | 346 | |
f9d67f43 DJ |
347 | static char |
348 | arm_find_mapping_symbol (CORE_ADDR memaddr, CORE_ADDR *start) | |
c906108c | 349 | { |
60c5725c | 350 | struct obj_section *sec; |
0428b8f5 | 351 | |
60c5725c DJ |
352 | /* If there are mapping symbols, consult them. */ |
353 | sec = find_pc_section (memaddr); | |
354 | if (sec != NULL) | |
355 | { | |
bd5766ec | 356 | arm_per_bfd *data = arm_bfd_data_key.get (sec->objfile->obfd); |
60c5725c DJ |
357 | if (data != NULL) |
358 | { | |
4838e44c SM |
359 | unsigned int section_idx = sec->the_bfd_section->index; |
360 | arm_mapping_symbol_vec &map | |
361 | = data->section_maps[section_idx]; | |
362 | ||
363 | /* Sort the vector on first use. */ | |
364 | if (!data->section_maps_sorted[section_idx]) | |
365 | { | |
366 | std::sort (map.begin (), map.end ()); | |
367 | data->section_maps_sorted[section_idx] = true; | |
368 | } | |
369 | ||
54cc7474 SM |
370 | struct arm_mapping_symbol map_key |
371 | = { memaddr - obj_section_addr (sec), 0 }; | |
54cc7474 SM |
372 | arm_mapping_symbol_vec::const_iterator it |
373 | = std::lower_bound (map.begin (), map.end (), map_key); | |
374 | ||
375 | /* std::lower_bound finds the earliest ordered insertion | |
376 | point. If the symbol at this position starts at this exact | |
377 | address, we use that; otherwise, the preceding | |
378 | mapping symbol covers this address. */ | |
379 | if (it < map.end ()) | |
60c5725c | 380 | { |
54cc7474 | 381 | if (it->value == map_key.value) |
60c5725c | 382 | { |
f9d67f43 | 383 | if (start) |
54cc7474 SM |
384 | *start = it->value + obj_section_addr (sec); |
385 | return it->type; | |
60c5725c DJ |
386 | } |
387 | } | |
54cc7474 SM |
388 | |
389 | if (it > map.begin ()) | |
390 | { | |
391 | arm_mapping_symbol_vec::const_iterator prev_it | |
392 | = it - 1; | |
393 | ||
394 | if (start) | |
395 | *start = prev_it->value + obj_section_addr (sec); | |
396 | return prev_it->type; | |
397 | } | |
60c5725c DJ |
398 | } |
399 | } | |
400 | ||
f9d67f43 DJ |
401 | return 0; |
402 | } | |
403 | ||
404 | /* Determine if the program counter specified in MEMADDR is in a Thumb | |
405 | function. This function should be called for addresses unrelated to | |
406 | any executing frame; otherwise, prefer arm_frame_is_thumb. */ | |
407 | ||
e3039479 | 408 | int |
9779414d | 409 | arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr) |
f9d67f43 | 410 | { |
7cbd4a93 | 411 | struct bound_minimal_symbol sym; |
f9d67f43 | 412 | char type; |
cfba9872 SM |
413 | arm_displaced_step_closure *dsc |
414 | = ((arm_displaced_step_closure * ) | |
415 | get_displaced_step_closure_by_addr (memaddr)); | |
a42244db YQ |
416 | |
417 | /* If checking the mode of displaced instruction in copy area, the mode | |
418 | should be determined by instruction on the original address. */ | |
419 | if (dsc) | |
420 | { | |
421 | if (debug_displaced) | |
422 | fprintf_unfiltered (gdb_stdlog, | |
423 | "displaced: check mode of %.8lx instead of %.8lx\n", | |
424 | (unsigned long) dsc->insn_addr, | |
425 | (unsigned long) memaddr); | |
426 | memaddr = dsc->insn_addr; | |
427 | } | |
f9d67f43 DJ |
428 | |
429 | /* If bit 0 of the address is set, assume this is a Thumb address. */ | |
430 | if (IS_THUMB_ADDR (memaddr)) | |
431 | return 1; | |
432 | ||
433 | /* If the user wants to override the symbol table, let him. */ | |
434 | if (strcmp (arm_force_mode_string, "arm") == 0) | |
435 | return 0; | |
436 | if (strcmp (arm_force_mode_string, "thumb") == 0) | |
437 | return 1; | |
438 | ||
9779414d DJ |
439 | /* ARM v6-M and v7-M are always in Thumb mode. */ |
440 | if (gdbarch_tdep (gdbarch)->is_m) | |
441 | return 1; | |
442 | ||
f9d67f43 DJ |
443 | /* If there are mapping symbols, consult them. */ |
444 | type = arm_find_mapping_symbol (memaddr, NULL); | |
445 | if (type) | |
446 | return type == 't'; | |
447 | ||
ed9a39eb | 448 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
c906108c | 449 | sym = lookup_minimal_symbol_by_pc (memaddr); |
7cbd4a93 TT |
450 | if (sym.minsym) |
451 | return (MSYMBOL_IS_SPECIAL (sym.minsym)); | |
0428b8f5 DJ |
452 | |
453 | /* If the user wants to override the fallback mode, let them. */ | |
454 | if (strcmp (arm_fallback_mode_string, "arm") == 0) | |
455 | return 0; | |
456 | if (strcmp (arm_fallback_mode_string, "thumb") == 0) | |
457 | return 1; | |
458 | ||
459 | /* If we couldn't find any symbol, but we're talking to a running | |
460 | target, then trust the current value of $cpsr. This lets | |
461 | "display/i $pc" always show the correct mode (though if there is | |
462 | a symbol table we will not reach here, so it still may not be | |
18819fa6 | 463 | displayed in the mode it will be executed). */ |
0428b8f5 | 464 | if (target_has_registers) |
18819fa6 | 465 | return arm_frame_is_thumb (get_current_frame ()); |
0428b8f5 DJ |
466 | |
467 | /* Otherwise we're out of luck; we assume ARM. */ | |
468 | return 0; | |
c906108c SS |
469 | } |
470 | ||
ca90e760 | 471 | /* Determine if the address specified equals any of these magic return |
55ea94da | 472 | values, called EXC_RETURN, defined by the ARM v6-M, v7-M and v8-M |
ca90e760 FH |
473 | architectures. |
474 | ||
475 | From ARMv6-M Reference Manual B1.5.8 | |
476 | Table B1-5 Exception return behavior | |
477 | ||
478 | EXC_RETURN Return To Return Stack | |
479 | 0xFFFFFFF1 Handler mode Main | |
480 | 0xFFFFFFF9 Thread mode Main | |
481 | 0xFFFFFFFD Thread mode Process | |
482 | ||
483 | From ARMv7-M Reference Manual B1.5.8 | |
484 | Table B1-8 EXC_RETURN definition of exception return behavior, no FP | |
485 | ||
486 | EXC_RETURN Return To Return Stack | |
487 | 0xFFFFFFF1 Handler mode Main | |
488 | 0xFFFFFFF9 Thread mode Main | |
489 | 0xFFFFFFFD Thread mode Process | |
490 | ||
491 | Table B1-9 EXC_RETURN definition of exception return behavior, with | |
492 | FP | |
493 | ||
494 | EXC_RETURN Return To Return Stack Frame Type | |
495 | 0xFFFFFFE1 Handler mode Main Extended | |
496 | 0xFFFFFFE9 Thread mode Main Extended | |
497 | 0xFFFFFFED Thread mode Process Extended | |
498 | 0xFFFFFFF1 Handler mode Main Basic | |
499 | 0xFFFFFFF9 Thread mode Main Basic | |
500 | 0xFFFFFFFD Thread mode Process Basic | |
501 | ||
502 | For more details see "B1.5.8 Exception return behavior" | |
55ea94da FH |
503 | in both ARMv6-M and ARMv7-M Architecture Reference Manuals. |
504 | ||
505 | In the ARMv8-M Architecture Technical Reference also adds | |
506 | for implementations without the Security Extension: | |
507 | ||
508 | EXC_RETURN Condition | |
509 | 0xFFFFFFB0 Return to Handler mode. | |
510 | 0xFFFFFFB8 Return to Thread mode using the main stack. | |
511 | 0xFFFFFFBC Return to Thread mode using the process stack. */ | |
ca90e760 FH |
512 | |
513 | static int | |
514 | arm_m_addr_is_magic (CORE_ADDR addr) | |
515 | { | |
516 | switch (addr) | |
517 | { | |
55ea94da FH |
518 | /* Values from ARMv8-M Architecture Technical Reference. */ |
519 | case 0xffffffb0: | |
520 | case 0xffffffb8: | |
521 | case 0xffffffbc: | |
ca90e760 FH |
522 | /* Values from Tables in B1.5.8 the EXC_RETURN definitions of |
523 | the exception return behavior. */ | |
524 | case 0xffffffe1: | |
525 | case 0xffffffe9: | |
526 | case 0xffffffed: | |
527 | case 0xfffffff1: | |
528 | case 0xfffffff9: | |
529 | case 0xfffffffd: | |
530 | /* Address is magic. */ | |
531 | return 1; | |
532 | ||
533 | default: | |
534 | /* Address is not magic. */ | |
535 | return 0; | |
536 | } | |
537 | } | |
538 | ||
181c1381 | 539 | /* Remove useless bits from addresses in a running program. */ |
34e8f22d | 540 | static CORE_ADDR |
24568a2c | 541 | arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val) |
c906108c | 542 | { |
2ae28aa9 YQ |
543 | /* On M-profile devices, do not strip the low bit from EXC_RETURN |
544 | (the magic exception return address). */ | |
545 | if (gdbarch_tdep (gdbarch)->is_m | |
ca90e760 | 546 | && arm_m_addr_is_magic (val)) |
2ae28aa9 YQ |
547 | return val; |
548 | ||
a3a2ee65 | 549 | if (arm_apcs_32) |
dd6be234 | 550 | return UNMAKE_THUMB_ADDR (val); |
c906108c | 551 | else |
a3a2ee65 | 552 | return (val & 0x03fffffc); |
c906108c SS |
553 | } |
554 | ||
0d39a070 | 555 | /* Return 1 if PC is the start of a compiler helper function which |
e0634ccf UW |
556 | can be safely ignored during prologue skipping. IS_THUMB is true |
557 | if the function is known to be a Thumb function due to the way it | |
558 | is being called. */ | |
0d39a070 | 559 | static int |
e0634ccf | 560 | skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb) |
0d39a070 | 561 | { |
e0634ccf | 562 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
7cbd4a93 | 563 | struct bound_minimal_symbol msym; |
0d39a070 DJ |
564 | |
565 | msym = lookup_minimal_symbol_by_pc (pc); | |
7cbd4a93 | 566 | if (msym.minsym != NULL |
77e371c0 | 567 | && BMSYMBOL_VALUE_ADDRESS (msym) == pc |
c9d95fa3 | 568 | && msym.minsym->linkage_name () != NULL) |
e0634ccf | 569 | { |
c9d95fa3 | 570 | const char *name = msym.minsym->linkage_name (); |
0d39a070 | 571 | |
e0634ccf UW |
572 | /* The GNU linker's Thumb call stub to foo is named |
573 | __foo_from_thumb. */ | |
574 | if (strstr (name, "_from_thumb") != NULL) | |
575 | name += 2; | |
0d39a070 | 576 | |
e0634ccf UW |
577 | /* On soft-float targets, __truncdfsf2 is called to convert promoted |
578 | arguments to their argument types in non-prototyped | |
579 | functions. */ | |
61012eef | 580 | if (startswith (name, "__truncdfsf2")) |
e0634ccf | 581 | return 1; |
61012eef | 582 | if (startswith (name, "__aeabi_d2f")) |
e0634ccf | 583 | return 1; |
0d39a070 | 584 | |
e0634ccf | 585 | /* Internal functions related to thread-local storage. */ |
61012eef | 586 | if (startswith (name, "__tls_get_addr")) |
e0634ccf | 587 | return 1; |
61012eef | 588 | if (startswith (name, "__aeabi_read_tp")) |
e0634ccf UW |
589 | return 1; |
590 | } | |
591 | else | |
592 | { | |
593 | /* If we run against a stripped glibc, we may be unable to identify | |
594 | special functions by name. Check for one important case, | |
595 | __aeabi_read_tp, by comparing the *code* against the default | |
596 | implementation (this is hand-written ARM assembler in glibc). */ | |
597 | ||
598 | if (!is_thumb | |
198cd59d | 599 | && read_code_unsigned_integer (pc, 4, byte_order_for_code) |
e0634ccf | 600 | == 0xe3e00a0f /* mov r0, #0xffff0fff */ |
198cd59d | 601 | && read_code_unsigned_integer (pc + 4, 4, byte_order_for_code) |
e0634ccf UW |
602 | == 0xe240f01f) /* sub pc, r0, #31 */ |
603 | return 1; | |
604 | } | |
ec3d575a | 605 | |
0d39a070 DJ |
606 | return 0; |
607 | } | |
608 | ||
621c6d5b YQ |
609 | /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is |
610 | the first 16-bit of instruction, and INSN2 is the second 16-bit of | |
611 | instruction. */ | |
612 | #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \ | |
613 | ((bits ((insn1), 0, 3) << 12) \ | |
614 | | (bits ((insn1), 10, 10) << 11) \ | |
615 | | (bits ((insn2), 12, 14) << 8) \ | |
616 | | bits ((insn2), 0, 7)) | |
617 | ||
618 | /* Extract the immediate from instruction movw/movt of encoding A. INSN is | |
619 | the 32-bit instruction. */ | |
620 | #define EXTRACT_MOVW_MOVT_IMM_A(insn) \ | |
621 | ((bits ((insn), 16, 19) << 12) \ | |
622 | | bits ((insn), 0, 11)) | |
623 | ||
ec3d575a UW |
624 | /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */ |
625 | ||
626 | static unsigned int | |
627 | thumb_expand_immediate (unsigned int imm) | |
628 | { | |
629 | unsigned int count = imm >> 7; | |
630 | ||
631 | if (count < 8) | |
632 | switch (count / 2) | |
633 | { | |
634 | case 0: | |
635 | return imm & 0xff; | |
636 | case 1: | |
637 | return (imm & 0xff) | ((imm & 0xff) << 16); | |
638 | case 2: | |
639 | return ((imm & 0xff) << 8) | ((imm & 0xff) << 24); | |
640 | case 3: | |
641 | return (imm & 0xff) | ((imm & 0xff) << 8) | |
642 | | ((imm & 0xff) << 16) | ((imm & 0xff) << 24); | |
643 | } | |
644 | ||
645 | return (0x80 | (imm & 0x7f)) << (32 - count); | |
646 | } | |
647 | ||
540314bd YQ |
648 | /* Return 1 if the 16-bit Thumb instruction INSN restores SP in |
649 | epilogue, 0 otherwise. */ | |
650 | ||
651 | static int | |
652 | thumb_instruction_restores_sp (unsigned short insn) | |
653 | { | |
654 | return (insn == 0x46bd /* mov sp, r7 */ | |
655 | || (insn & 0xff80) == 0xb000 /* add sp, imm */ | |
656 | || (insn & 0xfe00) == 0xbc00); /* pop <registers> */ | |
657 | } | |
658 | ||
29d73ae4 DJ |
659 | /* Analyze a Thumb prologue, looking for a recognizable stack frame |
660 | and frame pointer. Scan until we encounter a store that could | |
0d39a070 DJ |
661 | clobber the stack frame unexpectedly, or an unknown instruction. |
662 | Return the last address which is definitely safe to skip for an | |
663 | initial breakpoint. */ | |
c906108c SS |
664 | |
665 | static CORE_ADDR | |
29d73ae4 DJ |
666 | thumb_analyze_prologue (struct gdbarch *gdbarch, |
667 | CORE_ADDR start, CORE_ADDR limit, | |
668 | struct arm_prologue_cache *cache) | |
c906108c | 669 | { |
0d39a070 | 670 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
e17a4113 | 671 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
29d73ae4 DJ |
672 | int i; |
673 | pv_t regs[16]; | |
29d73ae4 | 674 | CORE_ADDR offset; |
ec3d575a | 675 | CORE_ADDR unrecognized_pc = 0; |
da3c6d4a | 676 | |
29d73ae4 DJ |
677 | for (i = 0; i < 16; i++) |
678 | regs[i] = pv_register (i, 0); | |
f7b7ed97 | 679 | pv_area stack (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
29d73ae4 | 680 | |
29d73ae4 | 681 | while (start < limit) |
c906108c | 682 | { |
29d73ae4 DJ |
683 | unsigned short insn; |
684 | ||
198cd59d | 685 | insn = read_code_unsigned_integer (start, 2, byte_order_for_code); |
9d4fde75 | 686 | |
94c30b78 | 687 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
da59e081 | 688 | { |
29d73ae4 DJ |
689 | int regno; |
690 | int mask; | |
4be43953 | 691 | |
f7b7ed97 | 692 | if (stack.store_would_trash (regs[ARM_SP_REGNUM])) |
4be43953 | 693 | break; |
29d73ae4 DJ |
694 | |
695 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says | |
696 | whether to save LR (R14). */ | |
697 | mask = (insn & 0xff) | ((insn & 0x100) << 6); | |
698 | ||
699 | /* Calculate offsets of saved R0-R7 and LR. */ | |
700 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
701 | if (mask & (1 << regno)) | |
702 | { | |
29d73ae4 DJ |
703 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
704 | -4); | |
f7b7ed97 | 705 | stack.store (regs[ARM_SP_REGNUM], 4, regs[regno]); |
29d73ae4 | 706 | } |
da59e081 | 707 | } |
1db01f22 | 708 | else if ((insn & 0xff80) == 0xb080) /* sub sp, #imm */ |
da59e081 | 709 | { |
29d73ae4 | 710 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
1db01f22 YQ |
711 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
712 | -offset); | |
da59e081 | 713 | } |
808f7ab1 YQ |
714 | else if (thumb_instruction_restores_sp (insn)) |
715 | { | |
716 | /* Don't scan past the epilogue. */ | |
717 | break; | |
718 | } | |
0d39a070 DJ |
719 | else if ((insn & 0xf800) == 0xa800) /* add Rd, sp, #imm */ |
720 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM], | |
721 | (insn & 0xff) << 2); | |
722 | else if ((insn & 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */ | |
723 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
724 | regs[bits (insn, 0, 2)] = pv_add_constant (regs[bits (insn, 3, 5)], | |
725 | bits (insn, 6, 8)); | |
726 | else if ((insn & 0xf800) == 0x3000 /* add Rd, #imm */ | |
727 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
728 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[bits (insn, 8, 10)], | |
729 | bits (insn, 0, 7)); | |
730 | else if ((insn & 0xfe00) == 0x1800 /* add Rd, Rn, Rm */ | |
731 | && pv_is_register (regs[bits (insn, 6, 8)], ARM_SP_REGNUM) | |
732 | && pv_is_constant (regs[bits (insn, 3, 5)])) | |
733 | regs[bits (insn, 0, 2)] = pv_add (regs[bits (insn, 3, 5)], | |
734 | regs[bits (insn, 6, 8)]); | |
735 | else if ((insn & 0xff00) == 0x4400 /* add Rd, Rm */ | |
736 | && pv_is_constant (regs[bits (insn, 3, 6)])) | |
737 | { | |
738 | int rd = (bit (insn, 7) << 3) + bits (insn, 0, 2); | |
739 | int rm = bits (insn, 3, 6); | |
740 | regs[rd] = pv_add (regs[rd], regs[rm]); | |
741 | } | |
29d73ae4 | 742 | else if ((insn & 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */ |
da59e081 | 743 | { |
29d73ae4 DJ |
744 | int dst_reg = (insn & 0x7) + ((insn & 0x80) >> 4); |
745 | int src_reg = (insn & 0x78) >> 3; | |
746 | regs[dst_reg] = regs[src_reg]; | |
da59e081 | 747 | } |
29d73ae4 | 748 | else if ((insn & 0xf800) == 0x9000) /* str rd, [sp, #off] */ |
da59e081 | 749 | { |
29d73ae4 DJ |
750 | /* Handle stores to the stack. Normally pushes are used, |
751 | but with GCC -mtpcs-frame, there may be other stores | |
752 | in the prologue to create the frame. */ | |
753 | int regno = (insn >> 8) & 0x7; | |
754 | pv_t addr; | |
755 | ||
756 | offset = (insn & 0xff) << 2; | |
757 | addr = pv_add_constant (regs[ARM_SP_REGNUM], offset); | |
758 | ||
f7b7ed97 | 759 | if (stack.store_would_trash (addr)) |
29d73ae4 DJ |
760 | break; |
761 | ||
f7b7ed97 | 762 | stack.store (addr, 4, regs[regno]); |
da59e081 | 763 | } |
0d39a070 DJ |
764 | else if ((insn & 0xf800) == 0x6000) /* str rd, [rn, #off] */ |
765 | { | |
766 | int rd = bits (insn, 0, 2); | |
767 | int rn = bits (insn, 3, 5); | |
768 | pv_t addr; | |
769 | ||
770 | offset = bits (insn, 6, 10) << 2; | |
771 | addr = pv_add_constant (regs[rn], offset); | |
772 | ||
f7b7ed97 | 773 | if (stack.store_would_trash (addr)) |
0d39a070 DJ |
774 | break; |
775 | ||
f7b7ed97 | 776 | stack.store (addr, 4, regs[rd]); |
0d39a070 DJ |
777 | } |
778 | else if (((insn & 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */ | |
779 | || (insn & 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */ | |
780 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
781 | /* Ignore stores of argument registers to the stack. */ | |
782 | ; | |
783 | else if ((insn & 0xf800) == 0xc800 /* ldmia Rn!, { registers } */ | |
784 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
785 | /* Ignore block loads from the stack, potentially copying | |
786 | parameters from memory. */ | |
787 | ; | |
788 | else if ((insn & 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */ | |
789 | || ((insn & 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */ | |
790 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM))) | |
791 | /* Similarly ignore single loads from the stack. */ | |
792 | ; | |
793 | else if ((insn & 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */ | |
794 | || (insn & 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */ | |
795 | /* Skip register copies, i.e. saves to another register | |
796 | instead of the stack. */ | |
797 | ; | |
798 | else if ((insn & 0xf800) == 0x2000) /* movs Rd, #imm */ | |
799 | /* Recognize constant loads; even with small stacks these are necessary | |
800 | on Thumb. */ | |
801 | regs[bits (insn, 8, 10)] = pv_constant (bits (insn, 0, 7)); | |
802 | else if ((insn & 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */ | |
803 | { | |
804 | /* Constant pool loads, for the same reason. */ | |
805 | unsigned int constant; | |
806 | CORE_ADDR loc; | |
807 | ||
808 | loc = start + 4 + bits (insn, 0, 7) * 4; | |
809 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
810 | regs[bits (insn, 8, 10)] = pv_constant (constant); | |
811 | } | |
db24da6d | 812 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instructions. */ |
0d39a070 | 813 | { |
0d39a070 DJ |
814 | unsigned short inst2; |
815 | ||
198cd59d YQ |
816 | inst2 = read_code_unsigned_integer (start + 2, 2, |
817 | byte_order_for_code); | |
0d39a070 DJ |
818 | |
819 | if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800) | |
820 | { | |
821 | /* BL, BLX. Allow some special function calls when | |
822 | skipping the prologue; GCC generates these before | |
823 | storing arguments to the stack. */ | |
824 | CORE_ADDR nextpc; | |
825 | int j1, j2, imm1, imm2; | |
826 | ||
827 | imm1 = sbits (insn, 0, 10); | |
828 | imm2 = bits (inst2, 0, 10); | |
829 | j1 = bit (inst2, 13); | |
830 | j2 = bit (inst2, 11); | |
831 | ||
832 | offset = ((imm1 << 12) + (imm2 << 1)); | |
833 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
834 | ||
835 | nextpc = start + 4 + offset; | |
836 | /* For BLX make sure to clear the low bits. */ | |
837 | if (bit (inst2, 12) == 0) | |
838 | nextpc = nextpc & 0xfffffffc; | |
839 | ||
e0634ccf UW |
840 | if (!skip_prologue_function (gdbarch, nextpc, |
841 | bit (inst2, 12) != 0)) | |
0d39a070 DJ |
842 | break; |
843 | } | |
ec3d575a | 844 | |
0963b4bd MS |
845 | else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, |
846 | { registers } */ | |
ec3d575a UW |
847 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
848 | { | |
849 | pv_t addr = regs[bits (insn, 0, 3)]; | |
850 | int regno; | |
851 | ||
f7b7ed97 | 852 | if (stack.store_would_trash (addr)) |
ec3d575a UW |
853 | break; |
854 | ||
855 | /* Calculate offsets of saved registers. */ | |
856 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
857 | if (inst2 & (1 << regno)) | |
858 | { | |
859 | addr = pv_add_constant (addr, -4); | |
f7b7ed97 | 860 | stack.store (addr, 4, regs[regno]); |
ec3d575a UW |
861 | } |
862 | ||
863 | if (insn & 0x0020) | |
864 | regs[bits (insn, 0, 3)] = addr; | |
865 | } | |
866 | ||
0963b4bd MS |
867 | else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, |
868 | [Rn, #+/-imm]{!} */ | |
ec3d575a UW |
869 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
870 | { | |
871 | int regno1 = bits (inst2, 12, 15); | |
872 | int regno2 = bits (inst2, 8, 11); | |
873 | pv_t addr = regs[bits (insn, 0, 3)]; | |
874 | ||
875 | offset = inst2 & 0xff; | |
876 | if (insn & 0x0080) | |
877 | addr = pv_add_constant (addr, offset); | |
878 | else | |
879 | addr = pv_add_constant (addr, -offset); | |
880 | ||
f7b7ed97 | 881 | if (stack.store_would_trash (addr)) |
ec3d575a UW |
882 | break; |
883 | ||
f7b7ed97 TT |
884 | stack.store (addr, 4, regs[regno1]); |
885 | stack.store (pv_add_constant (addr, 4), | |
886 | 4, regs[regno2]); | |
ec3d575a UW |
887 | |
888 | if (insn & 0x0020) | |
889 | regs[bits (insn, 0, 3)] = addr; | |
890 | } | |
891 | ||
892 | else if ((insn & 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */ | |
893 | && (inst2 & 0x0c00) == 0x0c00 | |
894 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
895 | { | |
896 | int regno = bits (inst2, 12, 15); | |
897 | pv_t addr = regs[bits (insn, 0, 3)]; | |
898 | ||
899 | offset = inst2 & 0xff; | |
900 | if (inst2 & 0x0200) | |
901 | addr = pv_add_constant (addr, offset); | |
902 | else | |
903 | addr = pv_add_constant (addr, -offset); | |
904 | ||
f7b7ed97 | 905 | if (stack.store_would_trash (addr)) |
ec3d575a UW |
906 | break; |
907 | ||
f7b7ed97 | 908 | stack.store (addr, 4, regs[regno]); |
ec3d575a UW |
909 | |
910 | if (inst2 & 0x0100) | |
911 | regs[bits (insn, 0, 3)] = addr; | |
912 | } | |
913 | ||
914 | else if ((insn & 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */ | |
915 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
916 | { | |
917 | int regno = bits (inst2, 12, 15); | |
918 | pv_t addr; | |
919 | ||
920 | offset = inst2 & 0xfff; | |
921 | addr = pv_add_constant (regs[bits (insn, 0, 3)], offset); | |
922 | ||
f7b7ed97 | 923 | if (stack.store_would_trash (addr)) |
ec3d575a UW |
924 | break; |
925 | ||
f7b7ed97 | 926 | stack.store (addr, 4, regs[regno]); |
ec3d575a UW |
927 | } |
928 | ||
929 | else if ((insn & 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */ | |
0d39a070 | 930 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 931 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 932 | ; |
ec3d575a UW |
933 | |
934 | else if ((insn & 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */ | |
935 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 936 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 937 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 938 | ; |
ec3d575a | 939 | |
0963b4bd MS |
940 | else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], |
941 | { registers } */ | |
ec3d575a UW |
942 | && (inst2 & 0x8000) == 0x0000 |
943 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
944 | /* Ignore block loads from the stack, potentially copying | |
945 | parameters from memory. */ | |
0d39a070 | 946 | ; |
ec3d575a | 947 | |
f8c6d152 | 948 | else if ((insn & 0xff70) == 0xe950 /* ldrd Rt, Rt2, |
0963b4bd | 949 | [Rn, #+/-imm] */ |
0d39a070 | 950 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 951 | /* Similarly ignore dual loads from the stack. */ |
0d39a070 | 952 | ; |
ec3d575a UW |
953 | |
954 | else if ((insn & 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */ | |
955 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 956 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 957 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 958 | ; |
ec3d575a UW |
959 | |
960 | else if ((insn & 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */ | |
0d39a070 | 961 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 962 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 963 | ; |
ec3d575a UW |
964 | |
965 | else if ((insn & 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */ | |
966 | && (inst2 & 0x8000) == 0x0000) | |
967 | { | |
968 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
969 | | (bits (inst2, 12, 14) << 8) | |
970 | | bits (inst2, 0, 7)); | |
971 | ||
972 | regs[bits (inst2, 8, 11)] | |
973 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
974 | thumb_expand_immediate (imm)); | |
975 | } | |
976 | ||
977 | else if ((insn & 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */ | |
978 | && (inst2 & 0x8000) == 0x0000) | |
0d39a070 | 979 | { |
ec3d575a UW |
980 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
981 | | (bits (inst2, 12, 14) << 8) | |
982 | | bits (inst2, 0, 7)); | |
983 | ||
984 | regs[bits (inst2, 8, 11)] | |
985 | = pv_add_constant (regs[bits (insn, 0, 3)], imm); | |
986 | } | |
987 | ||
988 | else if ((insn & 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */ | |
989 | && (inst2 & 0x8000) == 0x0000) | |
990 | { | |
991 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
992 | | (bits (inst2, 12, 14) << 8) | |
993 | | bits (inst2, 0, 7)); | |
994 | ||
995 | regs[bits (inst2, 8, 11)] | |
996 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
997 | - (CORE_ADDR) thumb_expand_immediate (imm)); | |
998 | } | |
999 | ||
1000 | else if ((insn & 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */ | |
1001 | && (inst2 & 0x8000) == 0x0000) | |
1002 | { | |
1003 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1004 | | (bits (inst2, 12, 14) << 8) | |
1005 | | bits (inst2, 0, 7)); | |
1006 | ||
1007 | regs[bits (inst2, 8, 11)] | |
1008 | = pv_add_constant (regs[bits (insn, 0, 3)], - (CORE_ADDR) imm); | |
1009 | } | |
1010 | ||
1011 | else if ((insn & 0xfbff) == 0xf04f) /* mov.w Rd, #const */ | |
1012 | { | |
1013 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1014 | | (bits (inst2, 12, 14) << 8) | |
1015 | | bits (inst2, 0, 7)); | |
1016 | ||
1017 | regs[bits (inst2, 8, 11)] | |
1018 | = pv_constant (thumb_expand_immediate (imm)); | |
1019 | } | |
1020 | ||
1021 | else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1022 | { | |
621c6d5b YQ |
1023 | unsigned int imm |
1024 | = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2); | |
ec3d575a UW |
1025 | |
1026 | regs[bits (inst2, 8, 11)] = pv_constant (imm); | |
1027 | } | |
1028 | ||
1029 | else if (insn == 0xea5f /* mov.w Rd,Rm */ | |
1030 | && (inst2 & 0xf0f0) == 0) | |
1031 | { | |
1032 | int dst_reg = (inst2 & 0x0f00) >> 8; | |
1033 | int src_reg = inst2 & 0xf; | |
1034 | regs[dst_reg] = regs[src_reg]; | |
1035 | } | |
1036 | ||
1037 | else if ((insn & 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */ | |
1038 | { | |
1039 | /* Constant pool loads. */ | |
1040 | unsigned int constant; | |
1041 | CORE_ADDR loc; | |
1042 | ||
cac395ea | 1043 | offset = bits (inst2, 0, 11); |
ec3d575a UW |
1044 | if (insn & 0x0080) |
1045 | loc = start + 4 + offset; | |
1046 | else | |
1047 | loc = start + 4 - offset; | |
1048 | ||
1049 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1050 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1051 | } | |
1052 | ||
1053 | else if ((insn & 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */ | |
1054 | { | |
1055 | /* Constant pool loads. */ | |
1056 | unsigned int constant; | |
1057 | CORE_ADDR loc; | |
1058 | ||
cac395ea | 1059 | offset = bits (inst2, 0, 7) << 2; |
ec3d575a UW |
1060 | if (insn & 0x0080) |
1061 | loc = start + 4 + offset; | |
1062 | else | |
1063 | loc = start + 4 - offset; | |
1064 | ||
1065 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1066 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1067 | ||
1068 | constant = read_memory_unsigned_integer (loc + 4, 4, byte_order); | |
1069 | regs[bits (inst2, 8, 11)] = pv_constant (constant); | |
1070 | } | |
1071 | ||
1072 | else if (thumb2_instruction_changes_pc (insn, inst2)) | |
1073 | { | |
1074 | /* Don't scan past anything that might change control flow. */ | |
0d39a070 DJ |
1075 | break; |
1076 | } | |
ec3d575a UW |
1077 | else |
1078 | { | |
1079 | /* The optimizer might shove anything into the prologue, | |
1080 | so we just skip what we don't recognize. */ | |
1081 | unrecognized_pc = start; | |
1082 | } | |
0d39a070 DJ |
1083 | |
1084 | start += 2; | |
1085 | } | |
ec3d575a | 1086 | else if (thumb_instruction_changes_pc (insn)) |
3d74b771 | 1087 | { |
ec3d575a | 1088 | /* Don't scan past anything that might change control flow. */ |
da3c6d4a | 1089 | break; |
3d74b771 | 1090 | } |
ec3d575a UW |
1091 | else |
1092 | { | |
1093 | /* The optimizer might shove anything into the prologue, | |
1094 | so we just skip what we don't recognize. */ | |
1095 | unrecognized_pc = start; | |
1096 | } | |
29d73ae4 DJ |
1097 | |
1098 | start += 2; | |
c906108c SS |
1099 | } |
1100 | ||
0d39a070 DJ |
1101 | if (arm_debug) |
1102 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1103 | paddress (gdbarch, start)); | |
1104 | ||
ec3d575a UW |
1105 | if (unrecognized_pc == 0) |
1106 | unrecognized_pc = start; | |
1107 | ||
29d73ae4 | 1108 | if (cache == NULL) |
f7b7ed97 | 1109 | return unrecognized_pc; |
29d73ae4 | 1110 | |
29d73ae4 DJ |
1111 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
1112 | { | |
1113 | /* Frame pointer is fp. Frame size is constant. */ | |
1114 | cache->framereg = ARM_FP_REGNUM; | |
1115 | cache->framesize = -regs[ARM_FP_REGNUM].k; | |
1116 | } | |
1117 | else if (pv_is_register (regs[THUMB_FP_REGNUM], ARM_SP_REGNUM)) | |
1118 | { | |
1119 | /* Frame pointer is r7. Frame size is constant. */ | |
1120 | cache->framereg = THUMB_FP_REGNUM; | |
1121 | cache->framesize = -regs[THUMB_FP_REGNUM].k; | |
1122 | } | |
72a2e3dc | 1123 | else |
29d73ae4 DJ |
1124 | { |
1125 | /* Try the stack pointer... this is a bit desperate. */ | |
1126 | cache->framereg = ARM_SP_REGNUM; | |
1127 | cache->framesize = -regs[ARM_SP_REGNUM].k; | |
1128 | } | |
29d73ae4 DJ |
1129 | |
1130 | for (i = 0; i < 16; i++) | |
f7b7ed97 | 1131 | if (stack.find_reg (gdbarch, i, &offset)) |
29d73ae4 DJ |
1132 | cache->saved_regs[i].addr = offset; |
1133 | ||
ec3d575a | 1134 | return unrecognized_pc; |
c906108c SS |
1135 | } |
1136 | ||
621c6d5b YQ |
1137 | |
1138 | /* Try to analyze the instructions starting from PC, which load symbol | |
1139 | __stack_chk_guard. Return the address of instruction after loading this | |
1140 | symbol, set the dest register number to *BASEREG, and set the size of | |
1141 | instructions for loading symbol in OFFSET. Return 0 if instructions are | |
1142 | not recognized. */ | |
1143 | ||
1144 | static CORE_ADDR | |
1145 | arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch, | |
1146 | unsigned int *destreg, int *offset) | |
1147 | { | |
1148 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1149 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1150 | unsigned int low, high, address; | |
1151 | ||
1152 | address = 0; | |
1153 | if (is_thumb) | |
1154 | { | |
1155 | unsigned short insn1 | |
198cd59d | 1156 | = read_code_unsigned_integer (pc, 2, byte_order_for_code); |
621c6d5b YQ |
1157 | |
1158 | if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */ | |
1159 | { | |
1160 | *destreg = bits (insn1, 8, 10); | |
1161 | *offset = 2; | |
6ae274b7 YQ |
1162 | address = (pc & 0xfffffffc) + 4 + (bits (insn1, 0, 7) << 2); |
1163 | address = read_memory_unsigned_integer (address, 4, | |
1164 | byte_order_for_code); | |
621c6d5b YQ |
1165 | } |
1166 | else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1167 | { | |
1168 | unsigned short insn2 | |
198cd59d | 1169 | = read_code_unsigned_integer (pc + 2, 2, byte_order_for_code); |
621c6d5b YQ |
1170 | |
1171 | low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1172 | ||
1173 | insn1 | |
198cd59d | 1174 | = read_code_unsigned_integer (pc + 4, 2, byte_order_for_code); |
621c6d5b | 1175 | insn2 |
198cd59d | 1176 | = read_code_unsigned_integer (pc + 6, 2, byte_order_for_code); |
621c6d5b YQ |
1177 | |
1178 | /* movt Rd, #const */ | |
1179 | if ((insn1 & 0xfbc0) == 0xf2c0) | |
1180 | { | |
1181 | high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1182 | *destreg = bits (insn2, 8, 11); | |
1183 | *offset = 8; | |
1184 | address = (high << 16 | low); | |
1185 | } | |
1186 | } | |
1187 | } | |
1188 | else | |
1189 | { | |
2e9e421f | 1190 | unsigned int insn |
198cd59d | 1191 | = read_code_unsigned_integer (pc, 4, byte_order_for_code); |
2e9e421f | 1192 | |
6ae274b7 | 1193 | if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, [PC, #immed] */ |
2e9e421f | 1194 | { |
6ae274b7 YQ |
1195 | address = bits (insn, 0, 11) + pc + 8; |
1196 | address = read_memory_unsigned_integer (address, 4, | |
1197 | byte_order_for_code); | |
1198 | ||
2e9e421f UW |
1199 | *destreg = bits (insn, 12, 15); |
1200 | *offset = 4; | |
1201 | } | |
1202 | else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */ | |
1203 | { | |
1204 | low = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1205 | ||
1206 | insn | |
198cd59d | 1207 | = read_code_unsigned_integer (pc + 4, 4, byte_order_for_code); |
2e9e421f UW |
1208 | |
1209 | if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */ | |
1210 | { | |
1211 | high = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1212 | *destreg = bits (insn, 12, 15); | |
1213 | *offset = 8; | |
1214 | address = (high << 16 | low); | |
1215 | } | |
1216 | } | |
621c6d5b YQ |
1217 | } |
1218 | ||
1219 | return address; | |
1220 | } | |
1221 | ||
1222 | /* Try to skip a sequence of instructions used for stack protector. If PC | |
0963b4bd MS |
1223 | points to the first instruction of this sequence, return the address of |
1224 | first instruction after this sequence, otherwise, return original PC. | |
621c6d5b YQ |
1225 | |
1226 | On arm, this sequence of instructions is composed of mainly three steps, | |
1227 | Step 1: load symbol __stack_chk_guard, | |
1228 | Step 2: load from address of __stack_chk_guard, | |
1229 | Step 3: store it to somewhere else. | |
1230 | ||
1231 | Usually, instructions on step 2 and step 3 are the same on various ARM | |
1232 | architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and | |
1233 | on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However, | |
1234 | instructions in step 1 vary from different ARM architectures. On ARMv7, | |
1235 | they are, | |
1236 | ||
1237 | movw Rn, #:lower16:__stack_chk_guard | |
1238 | movt Rn, #:upper16:__stack_chk_guard | |
1239 | ||
1240 | On ARMv5t, it is, | |
1241 | ||
1242 | ldr Rn, .Label | |
1243 | .... | |
1244 | .Lable: | |
1245 | .word __stack_chk_guard | |
1246 | ||
1247 | Since ldr/str is a very popular instruction, we can't use them as | |
1248 | 'fingerprint' or 'signature' of stack protector sequence. Here we choose | |
1249 | sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not | |
1250 | stripped, as the 'fingerprint' of a stack protector cdoe sequence. */ | |
1251 | ||
1252 | static CORE_ADDR | |
1253 | arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch) | |
1254 | { | |
1255 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
22e048c9 | 1256 | unsigned int basereg; |
7cbd4a93 | 1257 | struct bound_minimal_symbol stack_chk_guard; |
621c6d5b YQ |
1258 | int offset; |
1259 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1260 | CORE_ADDR addr; | |
1261 | ||
1262 | /* Try to parse the instructions in Step 1. */ | |
1263 | addr = arm_analyze_load_stack_chk_guard (pc, gdbarch, | |
1264 | &basereg, &offset); | |
1265 | if (!addr) | |
1266 | return pc; | |
1267 | ||
1268 | stack_chk_guard = lookup_minimal_symbol_by_pc (addr); | |
6041179a JB |
1269 | /* ADDR must correspond to a symbol whose name is __stack_chk_guard. |
1270 | Otherwise, this sequence cannot be for stack protector. */ | |
1271 | if (stack_chk_guard.minsym == NULL | |
c9d95fa3 | 1272 | || !startswith (stack_chk_guard.minsym->linkage_name (), "__stack_chk_guard")) |
621c6d5b YQ |
1273 | return pc; |
1274 | ||
1275 | if (is_thumb) | |
1276 | { | |
1277 | unsigned int destreg; | |
1278 | unsigned short insn | |
198cd59d | 1279 | = read_code_unsigned_integer (pc + offset, 2, byte_order_for_code); |
621c6d5b YQ |
1280 | |
1281 | /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */ | |
1282 | if ((insn & 0xf800) != 0x6800) | |
1283 | return pc; | |
1284 | if (bits (insn, 3, 5) != basereg) | |
1285 | return pc; | |
1286 | destreg = bits (insn, 0, 2); | |
1287 | ||
198cd59d YQ |
1288 | insn = read_code_unsigned_integer (pc + offset + 2, 2, |
1289 | byte_order_for_code); | |
621c6d5b YQ |
1290 | /* Step 3: str Rd, [Rn, #immed], encoding T1. */ |
1291 | if ((insn & 0xf800) != 0x6000) | |
1292 | return pc; | |
1293 | if (destreg != bits (insn, 0, 2)) | |
1294 | return pc; | |
1295 | } | |
1296 | else | |
1297 | { | |
1298 | unsigned int destreg; | |
1299 | unsigned int insn | |
198cd59d | 1300 | = read_code_unsigned_integer (pc + offset, 4, byte_order_for_code); |
621c6d5b YQ |
1301 | |
1302 | /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */ | |
1303 | if ((insn & 0x0e500000) != 0x04100000) | |
1304 | return pc; | |
1305 | if (bits (insn, 16, 19) != basereg) | |
1306 | return pc; | |
1307 | destreg = bits (insn, 12, 15); | |
1308 | /* Step 3: str Rd, [Rn, #immed], encoding A1. */ | |
198cd59d | 1309 | insn = read_code_unsigned_integer (pc + offset + 4, |
621c6d5b YQ |
1310 | 4, byte_order_for_code); |
1311 | if ((insn & 0x0e500000) != 0x04000000) | |
1312 | return pc; | |
1313 | if (bits (insn, 12, 15) != destreg) | |
1314 | return pc; | |
1315 | } | |
1316 | /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8 | |
1317 | on arm. */ | |
1318 | if (is_thumb) | |
1319 | return pc + offset + 4; | |
1320 | else | |
1321 | return pc + offset + 8; | |
1322 | } | |
1323 | ||
da3c6d4a MS |
1324 | /* Advance the PC across any function entry prologue instructions to |
1325 | reach some "real" code. | |
34e8f22d RE |
1326 | |
1327 | The APCS (ARM Procedure Call Standard) defines the following | |
ed9a39eb | 1328 | prologue: |
c906108c | 1329 | |
c5aa993b JM |
1330 | mov ip, sp |
1331 | [stmfd sp!, {a1,a2,a3,a4}] | |
1332 | stmfd sp!, {...,fp,ip,lr,pc} | |
ed9a39eb JM |
1333 | [stfe f7, [sp, #-12]!] |
1334 | [stfe f6, [sp, #-12]!] | |
1335 | [stfe f5, [sp, #-12]!] | |
1336 | [stfe f4, [sp, #-12]!] | |
0963b4bd | 1337 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */ |
c906108c | 1338 | |
34e8f22d | 1339 | static CORE_ADDR |
6093d2eb | 1340 | arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
c906108c | 1341 | { |
a89fea3c | 1342 | CORE_ADDR func_addr, limit_pc; |
c906108c | 1343 | |
a89fea3c JL |
1344 | /* See if we can determine the end of the prologue via the symbol table. |
1345 | If so, then return either PC, or the PC after the prologue, whichever | |
1346 | is greater. */ | |
1347 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
c906108c | 1348 | { |
d80b854b UW |
1349 | CORE_ADDR post_prologue_pc |
1350 | = skip_prologue_using_sal (gdbarch, func_addr); | |
43f3e411 | 1351 | struct compunit_symtab *cust = find_pc_compunit_symtab (func_addr); |
0d39a070 | 1352 | |
621c6d5b YQ |
1353 | if (post_prologue_pc) |
1354 | post_prologue_pc | |
1355 | = arm_skip_stack_protector (post_prologue_pc, gdbarch); | |
1356 | ||
1357 | ||
0d39a070 DJ |
1358 | /* GCC always emits a line note before the prologue and another |
1359 | one after, even if the two are at the same address or on the | |
1360 | same line. Take advantage of this so that we do not need to | |
1361 | know every instruction that might appear in the prologue. We | |
1362 | will have producer information for most binaries; if it is | |
1363 | missing (e.g. for -gstabs), assuming the GNU tools. */ | |
1364 | if (post_prologue_pc | |
43f3e411 DE |
1365 | && (cust == NULL |
1366 | || COMPUNIT_PRODUCER (cust) == NULL | |
61012eef | 1367 | || startswith (COMPUNIT_PRODUCER (cust), "GNU ") |
c2fd7fae | 1368 | || producer_is_llvm (COMPUNIT_PRODUCER (cust)))) |
0d39a070 DJ |
1369 | return post_prologue_pc; |
1370 | ||
a89fea3c | 1371 | if (post_prologue_pc != 0) |
0d39a070 DJ |
1372 | { |
1373 | CORE_ADDR analyzed_limit; | |
1374 | ||
1375 | /* For non-GCC compilers, make sure the entire line is an | |
1376 | acceptable prologue; GDB will round this function's | |
1377 | return value up to the end of the following line so we | |
1378 | can not skip just part of a line (and we do not want to). | |
1379 | ||
1380 | RealView does not treat the prologue specially, but does | |
1381 | associate prologue code with the opening brace; so this | |
1382 | lets us skip the first line if we think it is the opening | |
1383 | brace. */ | |
9779414d | 1384 | if (arm_pc_is_thumb (gdbarch, func_addr)) |
0d39a070 DJ |
1385 | analyzed_limit = thumb_analyze_prologue (gdbarch, func_addr, |
1386 | post_prologue_pc, NULL); | |
1387 | else | |
1388 | analyzed_limit = arm_analyze_prologue (gdbarch, func_addr, | |
1389 | post_prologue_pc, NULL); | |
1390 | ||
1391 | if (analyzed_limit != post_prologue_pc) | |
1392 | return func_addr; | |
1393 | ||
1394 | return post_prologue_pc; | |
1395 | } | |
c906108c SS |
1396 | } |
1397 | ||
a89fea3c JL |
1398 | /* Can't determine prologue from the symbol table, need to examine |
1399 | instructions. */ | |
c906108c | 1400 | |
a89fea3c JL |
1401 | /* Find an upper limit on the function prologue using the debug |
1402 | information. If the debug information could not be used to provide | |
1403 | that bound, then use an arbitrary large number as the upper bound. */ | |
0963b4bd | 1404 | /* Like arm_scan_prologue, stop no later than pc + 64. */ |
d80b854b | 1405 | limit_pc = skip_prologue_using_sal (gdbarch, pc); |
a89fea3c JL |
1406 | if (limit_pc == 0) |
1407 | limit_pc = pc + 64; /* Magic. */ | |
1408 | ||
c906108c | 1409 | |
29d73ae4 | 1410 | /* Check if this is Thumb code. */ |
9779414d | 1411 | if (arm_pc_is_thumb (gdbarch, pc)) |
a89fea3c | 1412 | return thumb_analyze_prologue (gdbarch, pc, limit_pc, NULL); |
21daaaaf YQ |
1413 | else |
1414 | return arm_analyze_prologue (gdbarch, pc, limit_pc, NULL); | |
c906108c | 1415 | } |
94c30b78 | 1416 | |
c5aa993b | 1417 | /* *INDENT-OFF* */ |
c906108c SS |
1418 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
1419 | This function decodes a Thumb function prologue to determine: | |
1420 | 1) the size of the stack frame | |
1421 | 2) which registers are saved on it | |
1422 | 3) the offsets of saved regs | |
1423 | 4) the offset from the stack pointer to the frame pointer | |
c906108c | 1424 | |
da59e081 JM |
1425 | A typical Thumb function prologue would create this stack frame |
1426 | (offsets relative to FP) | |
c906108c SS |
1427 | old SP -> 24 stack parameters |
1428 | 20 LR | |
1429 | 16 R7 | |
1430 | R7 -> 0 local variables (16 bytes) | |
1431 | SP -> -12 additional stack space (12 bytes) | |
1432 | The frame size would thus be 36 bytes, and the frame offset would be | |
0963b4bd | 1433 | 12 bytes. The frame register is R7. |
da59e081 | 1434 | |
da3c6d4a MS |
1435 | The comments for thumb_skip_prolog() describe the algorithm we use |
1436 | to detect the end of the prolog. */ | |
c5aa993b JM |
1437 | /* *INDENT-ON* */ |
1438 | ||
c906108c | 1439 | static void |
be8626e0 | 1440 | thumb_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR prev_pc, |
b39cc962 | 1441 | CORE_ADDR block_addr, struct arm_prologue_cache *cache) |
c906108c SS |
1442 | { |
1443 | CORE_ADDR prologue_start; | |
1444 | CORE_ADDR prologue_end; | |
c906108c | 1445 | |
b39cc962 DJ |
1446 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
1447 | &prologue_end)) | |
c906108c | 1448 | { |
ec3d575a UW |
1449 | /* See comment in arm_scan_prologue for an explanation of |
1450 | this heuristics. */ | |
1451 | if (prologue_end > prologue_start + 64) | |
1452 | { | |
1453 | prologue_end = prologue_start + 64; | |
1454 | } | |
c906108c SS |
1455 | } |
1456 | else | |
f7060f85 DJ |
1457 | /* We're in the boondocks: we have no idea where the start of the |
1458 | function is. */ | |
1459 | return; | |
c906108c | 1460 | |
325fac50 | 1461 | prologue_end = std::min (prologue_end, prev_pc); |
c906108c | 1462 | |
be8626e0 | 1463 | thumb_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); |
c906108c SS |
1464 | } |
1465 | ||
f303bc3e YQ |
1466 | /* Return 1 if the ARM instruction INSN restores SP in epilogue, 0 |
1467 | otherwise. */ | |
1468 | ||
1469 | static int | |
1470 | arm_instruction_restores_sp (unsigned int insn) | |
1471 | { | |
1472 | if (bits (insn, 28, 31) != INST_NV) | |
1473 | { | |
1474 | if ((insn & 0x0df0f000) == 0x0080d000 | |
1475 | /* ADD SP (register or immediate). */ | |
1476 | || (insn & 0x0df0f000) == 0x0040d000 | |
1477 | /* SUB SP (register or immediate). */ | |
1478 | || (insn & 0x0ffffff0) == 0x01a0d000 | |
1479 | /* MOV SP. */ | |
1480 | || (insn & 0x0fff0000) == 0x08bd0000 | |
1481 | /* POP (LDMIA). */ | |
1482 | || (insn & 0x0fff0000) == 0x049d0000) | |
1483 | /* POP of a single register. */ | |
1484 | return 1; | |
1485 | } | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
0d39a070 DJ |
1490 | /* Analyze an ARM mode prologue starting at PROLOGUE_START and |
1491 | continuing no further than PROLOGUE_END. If CACHE is non-NULL, | |
1492 | fill it in. Return the first address not recognized as a prologue | |
1493 | instruction. | |
eb5492fa | 1494 | |
0d39a070 DJ |
1495 | We recognize all the instructions typically found in ARM prologues, |
1496 | plus harmless instructions which can be skipped (either for analysis | |
1497 | purposes, or a more restrictive set that can be skipped when finding | |
1498 | the end of the prologue). */ | |
1499 | ||
1500 | static CORE_ADDR | |
1501 | arm_analyze_prologue (struct gdbarch *gdbarch, | |
1502 | CORE_ADDR prologue_start, CORE_ADDR prologue_end, | |
1503 | struct arm_prologue_cache *cache) | |
1504 | { | |
0d39a070 DJ |
1505 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
1506 | int regno; | |
1507 | CORE_ADDR offset, current_pc; | |
1508 | pv_t regs[ARM_FPS_REGNUM]; | |
0d39a070 DJ |
1509 | CORE_ADDR unrecognized_pc = 0; |
1510 | ||
1511 | /* Search the prologue looking for instructions that set up the | |
96baa820 | 1512 | frame pointer, adjust the stack pointer, and save registers. |
ed9a39eb | 1513 | |
96baa820 JM |
1514 | Be careful, however, and if it doesn't look like a prologue, |
1515 | don't try to scan it. If, for instance, a frameless function | |
1516 | begins with stmfd sp!, then we will tell ourselves there is | |
b8d5e71d | 1517 | a frame, which will confuse stack traceback, as well as "finish" |
96baa820 | 1518 | and other operations that rely on a knowledge of the stack |
0d39a070 | 1519 | traceback. */ |
d4473757 | 1520 | |
4be43953 DJ |
1521 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) |
1522 | regs[regno] = pv_register (regno, 0); | |
f7b7ed97 | 1523 | pv_area stack (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
4be43953 | 1524 | |
94c30b78 MS |
1525 | for (current_pc = prologue_start; |
1526 | current_pc < prologue_end; | |
f43845b3 | 1527 | current_pc += 4) |
96baa820 | 1528 | { |
e17a4113 | 1529 | unsigned int insn |
198cd59d | 1530 | = read_code_unsigned_integer (current_pc, 4, byte_order_for_code); |
9d4fde75 | 1531 | |
94c30b78 | 1532 | if (insn == 0xe1a0c00d) /* mov ip, sp */ |
f43845b3 | 1533 | { |
4be43953 | 1534 | regs[ARM_IP_REGNUM] = regs[ARM_SP_REGNUM]; |
28cd8767 JG |
1535 | continue; |
1536 | } | |
0d39a070 DJ |
1537 | else if ((insn & 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */ |
1538 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1539 | { |
1540 | unsigned imm = insn & 0xff; /* immediate value */ | |
1541 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1542 | int rd = bits (insn, 12, 15); |
28cd8767 | 1543 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1544 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], imm); |
28cd8767 JG |
1545 | continue; |
1546 | } | |
0d39a070 DJ |
1547 | else if ((insn & 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */ |
1548 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1549 | { |
1550 | unsigned imm = insn & 0xff; /* immediate value */ | |
1551 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1552 | int rd = bits (insn, 12, 15); |
28cd8767 | 1553 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1554 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], -imm); |
f43845b3 MS |
1555 | continue; |
1556 | } | |
0963b4bd MS |
1557 | else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd, |
1558 | [sp, #-4]! */ | |
f43845b3 | 1559 | { |
f7b7ed97 | 1560 | if (stack.store_would_trash (regs[ARM_SP_REGNUM])) |
4be43953 DJ |
1561 | break; |
1562 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
f7b7ed97 TT |
1563 | stack.store (regs[ARM_SP_REGNUM], 4, |
1564 | regs[bits (insn, 12, 15)]); | |
f43845b3 MS |
1565 | continue; |
1566 | } | |
1567 | else if ((insn & 0xffff0000) == 0xe92d0000) | |
d4473757 KB |
1568 | /* stmfd sp!, {..., fp, ip, lr, pc} |
1569 | or | |
1570 | stmfd sp!, {a1, a2, a3, a4} */ | |
c906108c | 1571 | { |
d4473757 | 1572 | int mask = insn & 0xffff; |
ed9a39eb | 1573 | |
f7b7ed97 | 1574 | if (stack.store_would_trash (regs[ARM_SP_REGNUM])) |
4be43953 DJ |
1575 | break; |
1576 | ||
94c30b78 | 1577 | /* Calculate offsets of saved registers. */ |
34e8f22d | 1578 | for (regno = ARM_PC_REGNUM; regno >= 0; regno--) |
d4473757 KB |
1579 | if (mask & (1 << regno)) |
1580 | { | |
0963b4bd MS |
1581 | regs[ARM_SP_REGNUM] |
1582 | = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
f7b7ed97 | 1583 | stack.store (regs[ARM_SP_REGNUM], 4, regs[regno]); |
d4473757 KB |
1584 | } |
1585 | } | |
0d39a070 DJ |
1586 | else if ((insn & 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */ |
1587 | || (insn & 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */ | |
f8bf5763 | 1588 | || (insn & 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */ |
b8d5e71d MS |
1589 | { |
1590 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1591 | continue; | |
1592 | } | |
0d39a070 DJ |
1593 | else if ((insn & 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */ |
1594 | || (insn & 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */ | |
f8bf5763 | 1595 | || (insn & 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */ |
f43845b3 MS |
1596 | { |
1597 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1598 | continue; | |
1599 | } | |
0963b4bd MS |
1600 | else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn, |
1601 | { registers } */ | |
0d39a070 DJ |
1602 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
1603 | { | |
1604 | /* No need to add this to saved_regs -- it's just arg regs. */ | |
1605 | continue; | |
1606 | } | |
d4473757 KB |
1607 | else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */ |
1608 | { | |
94c30b78 MS |
1609 | unsigned imm = insn & 0xff; /* immediate value */ |
1610 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1611 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1612 | regs[ARM_FP_REGNUM] = pv_add_constant (regs[ARM_IP_REGNUM], -imm); |
d4473757 KB |
1613 | } |
1614 | else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */ | |
1615 | { | |
94c30b78 MS |
1616 | unsigned imm = insn & 0xff; /* immediate value */ |
1617 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1618 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1619 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm); |
d4473757 | 1620 | } |
0963b4bd MS |
1621 | else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, |
1622 | [sp, -#c]! */ | |
2af46ca0 | 1623 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 | 1624 | { |
f7b7ed97 | 1625 | if (stack.store_would_trash (regs[ARM_SP_REGNUM])) |
4be43953 DJ |
1626 | break; |
1627 | ||
1628 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); | |
34e8f22d | 1629 | regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07); |
f7b7ed97 | 1630 | stack.store (regs[ARM_SP_REGNUM], 12, regs[regno]); |
d4473757 | 1631 | } |
0963b4bd MS |
1632 | else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, |
1633 | [sp!] */ | |
2af46ca0 | 1634 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 KB |
1635 | { |
1636 | int n_saved_fp_regs; | |
1637 | unsigned int fp_start_reg, fp_bound_reg; | |
1638 | ||
f7b7ed97 | 1639 | if (stack.store_would_trash (regs[ARM_SP_REGNUM])) |
4be43953 DJ |
1640 | break; |
1641 | ||
94c30b78 | 1642 | if ((insn & 0x800) == 0x800) /* N0 is set */ |
96baa820 | 1643 | { |
d4473757 KB |
1644 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1645 | n_saved_fp_regs = 3; | |
1646 | else | |
1647 | n_saved_fp_regs = 1; | |
96baa820 | 1648 | } |
d4473757 | 1649 | else |
96baa820 | 1650 | { |
d4473757 KB |
1651 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1652 | n_saved_fp_regs = 2; | |
1653 | else | |
1654 | n_saved_fp_regs = 4; | |
96baa820 | 1655 | } |
d4473757 | 1656 | |
34e8f22d | 1657 | fp_start_reg = ARM_F0_REGNUM + ((insn >> 12) & 0x7); |
d4473757 KB |
1658 | fp_bound_reg = fp_start_reg + n_saved_fp_regs; |
1659 | for (; fp_start_reg < fp_bound_reg; fp_start_reg++) | |
96baa820 | 1660 | { |
4be43953 | 1661 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); |
f7b7ed97 TT |
1662 | stack.store (regs[ARM_SP_REGNUM], 12, |
1663 | regs[fp_start_reg++]); | |
96baa820 | 1664 | } |
c906108c | 1665 | } |
0d39a070 DJ |
1666 | else if ((insn & 0xff000000) == 0xeb000000 && cache == NULL) /* bl */ |
1667 | { | |
1668 | /* Allow some special function calls when skipping the | |
1669 | prologue; GCC generates these before storing arguments to | |
1670 | the stack. */ | |
1671 | CORE_ADDR dest = BranchDest (current_pc, insn); | |
1672 | ||
e0634ccf | 1673 | if (skip_prologue_function (gdbarch, dest, 0)) |
0d39a070 DJ |
1674 | continue; |
1675 | else | |
1676 | break; | |
1677 | } | |
d4473757 | 1678 | else if ((insn & 0xf0000000) != 0xe0000000) |
0963b4bd | 1679 | break; /* Condition not true, exit early. */ |
0d39a070 DJ |
1680 | else if (arm_instruction_changes_pc (insn)) |
1681 | /* Don't scan past anything that might change control flow. */ | |
1682 | break; | |
f303bc3e YQ |
1683 | else if (arm_instruction_restores_sp (insn)) |
1684 | { | |
1685 | /* Don't scan past the epilogue. */ | |
1686 | break; | |
1687 | } | |
d19f7eee UW |
1688 | else if ((insn & 0xfe500000) == 0xe8100000 /* ldm */ |
1689 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1690 | /* Ignore block loads from the stack, potentially copying | |
1691 | parameters from memory. */ | |
1692 | continue; | |
1693 | else if ((insn & 0xfc500000) == 0xe4100000 | |
1694 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1695 | /* Similarly ignore single loads from the stack. */ | |
1696 | continue; | |
0d39a070 DJ |
1697 | else if ((insn & 0xffff0ff0) == 0xe1a00000) |
1698 | /* MOV Rd, Rm. Skip register copies, i.e. saves to another | |
1699 | register instead of the stack. */ | |
d4473757 | 1700 | continue; |
0d39a070 DJ |
1701 | else |
1702 | { | |
21daaaaf YQ |
1703 | /* The optimizer might shove anything into the prologue, if |
1704 | we build up cache (cache != NULL) from scanning prologue, | |
1705 | we just skip what we don't recognize and scan further to | |
1706 | make cache as complete as possible. However, if we skip | |
1707 | prologue, we'll stop immediately on unrecognized | |
1708 | instruction. */ | |
0d39a070 | 1709 | unrecognized_pc = current_pc; |
21daaaaf YQ |
1710 | if (cache != NULL) |
1711 | continue; | |
1712 | else | |
1713 | break; | |
0d39a070 | 1714 | } |
c906108c SS |
1715 | } |
1716 | ||
0d39a070 DJ |
1717 | if (unrecognized_pc == 0) |
1718 | unrecognized_pc = current_pc; | |
1719 | ||
0d39a070 DJ |
1720 | if (cache) |
1721 | { | |
4072f920 YQ |
1722 | int framereg, framesize; |
1723 | ||
1724 | /* The frame size is just the distance from the frame register | |
1725 | to the original stack pointer. */ | |
1726 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) | |
1727 | { | |
1728 | /* Frame pointer is fp. */ | |
1729 | framereg = ARM_FP_REGNUM; | |
1730 | framesize = -regs[ARM_FP_REGNUM].k; | |
1731 | } | |
1732 | else | |
1733 | { | |
1734 | /* Try the stack pointer... this is a bit desperate. */ | |
1735 | framereg = ARM_SP_REGNUM; | |
1736 | framesize = -regs[ARM_SP_REGNUM].k; | |
1737 | } | |
1738 | ||
0d39a070 DJ |
1739 | cache->framereg = framereg; |
1740 | cache->framesize = framesize; | |
1741 | ||
1742 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) | |
f7b7ed97 | 1743 | if (stack.find_reg (gdbarch, regno, &offset)) |
0d39a070 DJ |
1744 | cache->saved_regs[regno].addr = offset; |
1745 | } | |
1746 | ||
1747 | if (arm_debug) | |
1748 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1749 | paddress (gdbarch, unrecognized_pc)); | |
4be43953 | 1750 | |
0d39a070 DJ |
1751 | return unrecognized_pc; |
1752 | } | |
1753 | ||
1754 | static void | |
1755 | arm_scan_prologue (struct frame_info *this_frame, | |
1756 | struct arm_prologue_cache *cache) | |
1757 | { | |
1758 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1759 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
bec2ab5a | 1760 | CORE_ADDR prologue_start, prologue_end; |
0d39a070 DJ |
1761 | CORE_ADDR prev_pc = get_frame_pc (this_frame); |
1762 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
0d39a070 DJ |
1763 | |
1764 | /* Assume there is no frame until proven otherwise. */ | |
1765 | cache->framereg = ARM_SP_REGNUM; | |
1766 | cache->framesize = 0; | |
1767 | ||
1768 | /* Check for Thumb prologue. */ | |
1769 | if (arm_frame_is_thumb (this_frame)) | |
1770 | { | |
1771 | thumb_scan_prologue (gdbarch, prev_pc, block_addr, cache); | |
1772 | return; | |
1773 | } | |
1774 | ||
1775 | /* Find the function prologue. If we can't find the function in | |
1776 | the symbol table, peek in the stack frame to find the PC. */ | |
1777 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, | |
1778 | &prologue_end)) | |
1779 | { | |
1780 | /* One way to find the end of the prologue (which works well | |
1781 | for unoptimized code) is to do the following: | |
1782 | ||
1783 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
1784 | ||
1785 | if (sal.line == 0) | |
1786 | prologue_end = prev_pc; | |
1787 | else if (sal.end < prologue_end) | |
1788 | prologue_end = sal.end; | |
1789 | ||
1790 | This mechanism is very accurate so long as the optimizer | |
1791 | doesn't move any instructions from the function body into the | |
1792 | prologue. If this happens, sal.end will be the last | |
1793 | instruction in the first hunk of prologue code just before | |
1794 | the first instruction that the scheduler has moved from | |
1795 | the body to the prologue. | |
1796 | ||
1797 | In order to make sure that we scan all of the prologue | |
1798 | instructions, we use a slightly less accurate mechanism which | |
1799 | may scan more than necessary. To help compensate for this | |
1800 | lack of accuracy, the prologue scanning loop below contains | |
1801 | several clauses which'll cause the loop to terminate early if | |
1802 | an implausible prologue instruction is encountered. | |
1803 | ||
1804 | The expression | |
1805 | ||
1806 | prologue_start + 64 | |
1807 | ||
1808 | is a suitable endpoint since it accounts for the largest | |
1809 | possible prologue plus up to five instructions inserted by | |
1810 | the scheduler. */ | |
1811 | ||
1812 | if (prologue_end > prologue_start + 64) | |
1813 | { | |
1814 | prologue_end = prologue_start + 64; /* See above. */ | |
1815 | } | |
1816 | } | |
1817 | else | |
1818 | { | |
1819 | /* We have no symbol information. Our only option is to assume this | |
1820 | function has a standard stack frame and the normal frame register. | |
1821 | Then, we can find the value of our frame pointer on entrance to | |
1822 | the callee (or at the present moment if this is the innermost frame). | |
1823 | The value stored there should be the address of the stmfd + 8. */ | |
1824 | CORE_ADDR frame_loc; | |
7913a64c | 1825 | ULONGEST return_value; |
0d39a070 | 1826 | |
9e237747 MM |
1827 | /* AAPCS does not use a frame register, so we can abort here. */ |
1828 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_AAPCS) | |
1829 | return; | |
1830 | ||
0d39a070 | 1831 | frame_loc = get_frame_register_unsigned (this_frame, ARM_FP_REGNUM); |
7913a64c YQ |
1832 | if (!safe_read_memory_unsigned_integer (frame_loc, 4, byte_order, |
1833 | &return_value)) | |
0d39a070 DJ |
1834 | return; |
1835 | else | |
1836 | { | |
1837 | prologue_start = gdbarch_addr_bits_remove | |
1838 | (gdbarch, return_value) - 8; | |
1839 | prologue_end = prologue_start + 64; /* See above. */ | |
1840 | } | |
1841 | } | |
1842 | ||
1843 | if (prev_pc < prologue_end) | |
1844 | prologue_end = prev_pc; | |
1845 | ||
1846 | arm_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); | |
c906108c SS |
1847 | } |
1848 | ||
eb5492fa | 1849 | static struct arm_prologue_cache * |
a262aec2 | 1850 | arm_make_prologue_cache (struct frame_info *this_frame) |
c906108c | 1851 | { |
eb5492fa DJ |
1852 | int reg; |
1853 | struct arm_prologue_cache *cache; | |
1854 | CORE_ADDR unwound_fp; | |
c5aa993b | 1855 | |
35d5d4ee | 1856 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 1857 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
c906108c | 1858 | |
a262aec2 | 1859 | arm_scan_prologue (this_frame, cache); |
848cfffb | 1860 | |
a262aec2 | 1861 | unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); |
eb5492fa DJ |
1862 | if (unwound_fp == 0) |
1863 | return cache; | |
c906108c | 1864 | |
4be43953 | 1865 | cache->prev_sp = unwound_fp + cache->framesize; |
c906108c | 1866 | |
eb5492fa DJ |
1867 | /* Calculate actual addresses of saved registers using offsets |
1868 | determined by arm_scan_prologue. */ | |
a262aec2 | 1869 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) |
e28a332c | 1870 | if (trad_frame_addr_p (cache->saved_regs, reg)) |
eb5492fa DJ |
1871 | cache->saved_regs[reg].addr += cache->prev_sp; |
1872 | ||
1873 | return cache; | |
c906108c SS |
1874 | } |
1875 | ||
c1ee9414 LM |
1876 | /* Implementation of the stop_reason hook for arm_prologue frames. */ |
1877 | ||
1878 | static enum unwind_stop_reason | |
1879 | arm_prologue_unwind_stop_reason (struct frame_info *this_frame, | |
1880 | void **this_cache) | |
1881 | { | |
1882 | struct arm_prologue_cache *cache; | |
1883 | CORE_ADDR pc; | |
1884 | ||
1885 | if (*this_cache == NULL) | |
1886 | *this_cache = arm_make_prologue_cache (this_frame); | |
9a3c8263 | 1887 | cache = (struct arm_prologue_cache *) *this_cache; |
c1ee9414 LM |
1888 | |
1889 | /* This is meant to halt the backtrace at "_start". */ | |
1890 | pc = get_frame_pc (this_frame); | |
1891 | if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) | |
1892 | return UNWIND_OUTERMOST; | |
1893 | ||
1894 | /* If we've hit a wall, stop. */ | |
1895 | if (cache->prev_sp == 0) | |
1896 | return UNWIND_OUTERMOST; | |
1897 | ||
1898 | return UNWIND_NO_REASON; | |
1899 | } | |
1900 | ||
eb5492fa DJ |
1901 | /* Our frame ID for a normal frame is the current function's starting PC |
1902 | and the caller's SP when we were called. */ | |
c906108c | 1903 | |
148754e5 | 1904 | static void |
a262aec2 | 1905 | arm_prologue_this_id (struct frame_info *this_frame, |
eb5492fa DJ |
1906 | void **this_cache, |
1907 | struct frame_id *this_id) | |
c906108c | 1908 | { |
eb5492fa DJ |
1909 | struct arm_prologue_cache *cache; |
1910 | struct frame_id id; | |
2c404490 | 1911 | CORE_ADDR pc, func; |
f079148d | 1912 | |
eb5492fa | 1913 | if (*this_cache == NULL) |
a262aec2 | 1914 | *this_cache = arm_make_prologue_cache (this_frame); |
9a3c8263 | 1915 | cache = (struct arm_prologue_cache *) *this_cache; |
2a451106 | 1916 | |
0e9e9abd UW |
1917 | /* Use function start address as part of the frame ID. If we cannot |
1918 | identify the start address (due to missing symbol information), | |
1919 | fall back to just using the current PC. */ | |
c1ee9414 | 1920 | pc = get_frame_pc (this_frame); |
2c404490 | 1921 | func = get_frame_func (this_frame); |
0e9e9abd UW |
1922 | if (!func) |
1923 | func = pc; | |
1924 | ||
eb5492fa | 1925 | id = frame_id_build (cache->prev_sp, func); |
eb5492fa | 1926 | *this_id = id; |
c906108c SS |
1927 | } |
1928 | ||
a262aec2 DJ |
1929 | static struct value * |
1930 | arm_prologue_prev_register (struct frame_info *this_frame, | |
eb5492fa | 1931 | void **this_cache, |
a262aec2 | 1932 | int prev_regnum) |
24de872b | 1933 | { |
24568a2c | 1934 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
24de872b DJ |
1935 | struct arm_prologue_cache *cache; |
1936 | ||
eb5492fa | 1937 | if (*this_cache == NULL) |
a262aec2 | 1938 | *this_cache = arm_make_prologue_cache (this_frame); |
9a3c8263 | 1939 | cache = (struct arm_prologue_cache *) *this_cache; |
24de872b | 1940 | |
eb5492fa | 1941 | /* If we are asked to unwind the PC, then we need to return the LR |
b39cc962 DJ |
1942 | instead. The prologue may save PC, but it will point into this |
1943 | frame's prologue, not the next frame's resume location. Also | |
1944 | strip the saved T bit. A valid LR may have the low bit set, but | |
1945 | a valid PC never does. */ | |
eb5492fa | 1946 | if (prev_regnum == ARM_PC_REGNUM) |
b39cc962 DJ |
1947 | { |
1948 | CORE_ADDR lr; | |
1949 | ||
1950 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
1951 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
24568a2c | 1952 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 | 1953 | } |
24de872b | 1954 | |
eb5492fa | 1955 | /* SP is generally not saved to the stack, but this frame is |
a262aec2 | 1956 | identified by the next frame's stack pointer at the time of the call. |
eb5492fa DJ |
1957 | The value was already reconstructed into PREV_SP. */ |
1958 | if (prev_regnum == ARM_SP_REGNUM) | |
a262aec2 | 1959 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
eb5492fa | 1960 | |
b39cc962 DJ |
1961 | /* The CPSR may have been changed by the call instruction and by the |
1962 | called function. The only bit we can reconstruct is the T bit, | |
1963 | by checking the low bit of LR as of the call. This is a reliable | |
1964 | indicator of Thumb-ness except for some ARM v4T pre-interworking | |
1965 | Thumb code, which could get away with a clear low bit as long as | |
1966 | the called function did not use bx. Guess that all other | |
1967 | bits are unchanged; the condition flags are presumably lost, | |
1968 | but the processor status is likely valid. */ | |
1969 | if (prev_regnum == ARM_PS_REGNUM) | |
1970 | { | |
1971 | CORE_ADDR lr, cpsr; | |
9779414d | 1972 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
1973 | |
1974 | cpsr = get_frame_register_unsigned (this_frame, prev_regnum); | |
1975 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
1976 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 1977 | cpsr |= t_bit; |
b39cc962 | 1978 | else |
9779414d | 1979 | cpsr &= ~t_bit; |
b39cc962 DJ |
1980 | return frame_unwind_got_constant (this_frame, prev_regnum, cpsr); |
1981 | } | |
1982 | ||
a262aec2 DJ |
1983 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
1984 | prev_regnum); | |
eb5492fa DJ |
1985 | } |
1986 | ||
1987 | struct frame_unwind arm_prologue_unwind = { | |
1988 | NORMAL_FRAME, | |
c1ee9414 | 1989 | arm_prologue_unwind_stop_reason, |
eb5492fa | 1990 | arm_prologue_this_id, |
a262aec2 DJ |
1991 | arm_prologue_prev_register, |
1992 | NULL, | |
1993 | default_frame_sniffer | |
eb5492fa DJ |
1994 | }; |
1995 | ||
0e9e9abd UW |
1996 | /* Maintain a list of ARM exception table entries per objfile, similar to the |
1997 | list of mapping symbols. We only cache entries for standard ARM-defined | |
1998 | personality routines; the cache will contain only the frame unwinding | |
1999 | instructions associated with the entry (not the descriptors). */ | |
2000 | ||
0e9e9abd UW |
2001 | struct arm_exidx_entry |
2002 | { | |
227031b2 | 2003 | CORE_ADDR addr; |
0e9e9abd | 2004 | gdb_byte *entry; |
7a5d944b TT |
2005 | |
2006 | bool operator< (const arm_exidx_entry &other) const | |
2007 | { | |
2008 | return addr < other.addr; | |
2009 | } | |
0e9e9abd | 2010 | }; |
0e9e9abd UW |
2011 | |
2012 | struct arm_exidx_data | |
2013 | { | |
7a5d944b | 2014 | std::vector<std::vector<arm_exidx_entry>> section_maps; |
0e9e9abd UW |
2015 | }; |
2016 | ||
a2726d4f LM |
2017 | /* Per-BFD key to store exception handling information. */ |
2018 | static const struct bfd_key<arm_exidx_data> arm_exidx_data_key; | |
0e9e9abd UW |
2019 | |
2020 | static struct obj_section * | |
2021 | arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma) | |
2022 | { | |
2023 | struct obj_section *osect; | |
2024 | ||
2025 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
fd361982 | 2026 | if (bfd_section_flags (osect->the_bfd_section) & SEC_ALLOC) |
0e9e9abd UW |
2027 | { |
2028 | bfd_vma start, size; | |
fd361982 AM |
2029 | start = bfd_section_vma (osect->the_bfd_section); |
2030 | size = bfd_section_size (osect->the_bfd_section); | |
0e9e9abd UW |
2031 | |
2032 | if (start <= vma && vma < start + size) | |
2033 | return osect; | |
2034 | } | |
2035 | ||
2036 | return NULL; | |
2037 | } | |
2038 | ||
2039 | /* Parse contents of exception table and exception index sections | |
2040 | of OBJFILE, and fill in the exception table entry cache. | |
2041 | ||
2042 | For each entry that refers to a standard ARM-defined personality | |
2043 | routine, extract the frame unwinding instructions (from either | |
2044 | the index or the table section). The unwinding instructions | |
2045 | are normalized by: | |
2046 | - extracting them from the rest of the table data | |
2047 | - converting to host endianness | |
2048 | - appending the implicit 0xb0 ("Finish") code | |
2049 | ||
2050 | The extracted and normalized instructions are stored for later | |
2051 | retrieval by the arm_find_exidx_entry routine. */ | |
2052 | ||
2053 | static void | |
2054 | arm_exidx_new_objfile (struct objfile *objfile) | |
2055 | { | |
0e9e9abd UW |
2056 | struct arm_exidx_data *data; |
2057 | asection *exidx, *extab; | |
2058 | bfd_vma exidx_vma = 0, extab_vma = 0; | |
0e9e9abd UW |
2059 | LONGEST i; |
2060 | ||
2061 | /* If we've already touched this file, do nothing. */ | |
a2726d4f | 2062 | if (!objfile || arm_exidx_data_key.get (objfile->obfd) != NULL) |
0e9e9abd UW |
2063 | return; |
2064 | ||
2065 | /* Read contents of exception table and index. */ | |
a5eda10c | 2066 | exidx = bfd_get_section_by_name (objfile->obfd, ELF_STRING_ARM_unwind); |
984c7238 | 2067 | gdb::byte_vector exidx_data; |
0e9e9abd UW |
2068 | if (exidx) |
2069 | { | |
fd361982 AM |
2070 | exidx_vma = bfd_section_vma (exidx); |
2071 | exidx_data.resize (bfd_section_size (exidx)); | |
0e9e9abd UW |
2072 | |
2073 | if (!bfd_get_section_contents (objfile->obfd, exidx, | |
984c7238 TT |
2074 | exidx_data.data (), 0, |
2075 | exidx_data.size ())) | |
2076 | return; | |
0e9e9abd UW |
2077 | } |
2078 | ||
2079 | extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab"); | |
984c7238 | 2080 | gdb::byte_vector extab_data; |
0e9e9abd UW |
2081 | if (extab) |
2082 | { | |
fd361982 AM |
2083 | extab_vma = bfd_section_vma (extab); |
2084 | extab_data.resize (bfd_section_size (extab)); | |
0e9e9abd UW |
2085 | |
2086 | if (!bfd_get_section_contents (objfile->obfd, extab, | |
984c7238 TT |
2087 | extab_data.data (), 0, |
2088 | extab_data.size ())) | |
2089 | return; | |
0e9e9abd UW |
2090 | } |
2091 | ||
2092 | /* Allocate exception table data structure. */ | |
a2726d4f | 2093 | data = arm_exidx_data_key.emplace (objfile->obfd); |
7a5d944b | 2094 | data->section_maps.resize (objfile->obfd->section_count); |
0e9e9abd UW |
2095 | |
2096 | /* Fill in exception table. */ | |
984c7238 | 2097 | for (i = 0; i < exidx_data.size () / 8; i++) |
0e9e9abd UW |
2098 | { |
2099 | struct arm_exidx_entry new_exidx_entry; | |
984c7238 TT |
2100 | bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data.data () + i * 8); |
2101 | bfd_vma val = bfd_h_get_32 (objfile->obfd, | |
2102 | exidx_data.data () + i * 8 + 4); | |
0e9e9abd UW |
2103 | bfd_vma addr = 0, word = 0; |
2104 | int n_bytes = 0, n_words = 0; | |
2105 | struct obj_section *sec; | |
2106 | gdb_byte *entry = NULL; | |
2107 | ||
2108 | /* Extract address of start of function. */ | |
2109 | idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2110 | idx += exidx_vma + i * 8; | |
2111 | ||
2112 | /* Find section containing function and compute section offset. */ | |
2113 | sec = arm_obj_section_from_vma (objfile, idx); | |
2114 | if (sec == NULL) | |
2115 | continue; | |
fd361982 | 2116 | idx -= bfd_section_vma (sec->the_bfd_section); |
0e9e9abd UW |
2117 | |
2118 | /* Determine address of exception table entry. */ | |
2119 | if (val == 1) | |
2120 | { | |
2121 | /* EXIDX_CANTUNWIND -- no exception table entry present. */ | |
2122 | } | |
2123 | else if ((val & 0xff000000) == 0x80000000) | |
2124 | { | |
2125 | /* Exception table entry embedded in .ARM.exidx | |
2126 | -- must be short form. */ | |
2127 | word = val; | |
2128 | n_bytes = 3; | |
2129 | } | |
2130 | else if (!(val & 0x80000000)) | |
2131 | { | |
2132 | /* Exception table entry in .ARM.extab. */ | |
2133 | addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2134 | addr += exidx_vma + i * 8 + 4; | |
2135 | ||
984c7238 | 2136 | if (addr >= extab_vma && addr + 4 <= extab_vma + extab_data.size ()) |
0e9e9abd UW |
2137 | { |
2138 | word = bfd_h_get_32 (objfile->obfd, | |
984c7238 | 2139 | extab_data.data () + addr - extab_vma); |
0e9e9abd UW |
2140 | addr += 4; |
2141 | ||
2142 | if ((word & 0xff000000) == 0x80000000) | |
2143 | { | |
2144 | /* Short form. */ | |
2145 | n_bytes = 3; | |
2146 | } | |
2147 | else if ((word & 0xff000000) == 0x81000000 | |
2148 | || (word & 0xff000000) == 0x82000000) | |
2149 | { | |
2150 | /* Long form. */ | |
2151 | n_bytes = 2; | |
2152 | n_words = ((word >> 16) & 0xff); | |
2153 | } | |
2154 | else if (!(word & 0x80000000)) | |
2155 | { | |
2156 | bfd_vma pers; | |
2157 | struct obj_section *pers_sec; | |
2158 | int gnu_personality = 0; | |
2159 | ||
2160 | /* Custom personality routine. */ | |
2161 | pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2162 | pers = UNMAKE_THUMB_ADDR (pers + addr - 4); | |
2163 | ||
2164 | /* Check whether we've got one of the variants of the | |
2165 | GNU personality routines. */ | |
2166 | pers_sec = arm_obj_section_from_vma (objfile, pers); | |
2167 | if (pers_sec) | |
2168 | { | |
2169 | static const char *personality[] = | |
2170 | { | |
2171 | "__gcc_personality_v0", | |
2172 | "__gxx_personality_v0", | |
2173 | "__gcj_personality_v0", | |
2174 | "__gnu_objc_personality_v0", | |
2175 | NULL | |
2176 | }; | |
2177 | ||
2178 | CORE_ADDR pc = pers + obj_section_offset (pers_sec); | |
2179 | int k; | |
2180 | ||
2181 | for (k = 0; personality[k]; k++) | |
2182 | if (lookup_minimal_symbol_by_pc_name | |
2183 | (pc, personality[k], objfile)) | |
2184 | { | |
2185 | gnu_personality = 1; | |
2186 | break; | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | /* If so, the next word contains a word count in the high | |
2191 | byte, followed by the same unwind instructions as the | |
2192 | pre-defined forms. */ | |
2193 | if (gnu_personality | |
984c7238 | 2194 | && addr + 4 <= extab_vma + extab_data.size ()) |
0e9e9abd UW |
2195 | { |
2196 | word = bfd_h_get_32 (objfile->obfd, | |
984c7238 TT |
2197 | (extab_data.data () |
2198 | + addr - extab_vma)); | |
0e9e9abd UW |
2199 | addr += 4; |
2200 | n_bytes = 3; | |
2201 | n_words = ((word >> 24) & 0xff); | |
2202 | } | |
2203 | } | |
2204 | } | |
2205 | } | |
2206 | ||
2207 | /* Sanity check address. */ | |
2208 | if (n_words) | |
984c7238 TT |
2209 | if (addr < extab_vma |
2210 | || addr + 4 * n_words > extab_vma + extab_data.size ()) | |
0e9e9abd UW |
2211 | n_words = n_bytes = 0; |
2212 | ||
2213 | /* The unwind instructions reside in WORD (only the N_BYTES least | |
2214 | significant bytes are valid), followed by N_WORDS words in the | |
2215 | extab section starting at ADDR. */ | |
2216 | if (n_bytes || n_words) | |
2217 | { | |
224c3ddb SM |
2218 | gdb_byte *p = entry |
2219 | = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, | |
2220 | n_bytes + n_words * 4 + 1); | |
0e9e9abd UW |
2221 | |
2222 | while (n_bytes--) | |
2223 | *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff); | |
2224 | ||
2225 | while (n_words--) | |
2226 | { | |
2227 | word = bfd_h_get_32 (objfile->obfd, | |
984c7238 | 2228 | extab_data.data () + addr - extab_vma); |
0e9e9abd UW |
2229 | addr += 4; |
2230 | ||
2231 | *p++ = (gdb_byte) ((word >> 24) & 0xff); | |
2232 | *p++ = (gdb_byte) ((word >> 16) & 0xff); | |
2233 | *p++ = (gdb_byte) ((word >> 8) & 0xff); | |
2234 | *p++ = (gdb_byte) (word & 0xff); | |
2235 | } | |
2236 | ||
2237 | /* Implied "Finish" to terminate the list. */ | |
2238 | *p++ = 0xb0; | |
2239 | } | |
2240 | ||
2241 | /* Push entry onto vector. They are guaranteed to always | |
2242 | appear in order of increasing addresses. */ | |
2243 | new_exidx_entry.addr = idx; | |
2244 | new_exidx_entry.entry = entry; | |
7a5d944b TT |
2245 | data->section_maps[sec->the_bfd_section->index].push_back |
2246 | (new_exidx_entry); | |
0e9e9abd | 2247 | } |
0e9e9abd UW |
2248 | } |
2249 | ||
2250 | /* Search for the exception table entry covering MEMADDR. If one is found, | |
2251 | return a pointer to its data. Otherwise, return 0. If START is non-NULL, | |
2252 | set *START to the start of the region covered by this entry. */ | |
2253 | ||
2254 | static gdb_byte * | |
2255 | arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start) | |
2256 | { | |
2257 | struct obj_section *sec; | |
2258 | ||
2259 | sec = find_pc_section (memaddr); | |
2260 | if (sec != NULL) | |
2261 | { | |
2262 | struct arm_exidx_data *data; | |
0e9e9abd | 2263 | struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 }; |
0e9e9abd | 2264 | |
a2726d4f | 2265 | data = arm_exidx_data_key.get (sec->objfile->obfd); |
0e9e9abd UW |
2266 | if (data != NULL) |
2267 | { | |
7a5d944b TT |
2268 | std::vector<arm_exidx_entry> &map |
2269 | = data->section_maps[sec->the_bfd_section->index]; | |
2270 | if (!map.empty ()) | |
0e9e9abd | 2271 | { |
7a5d944b | 2272 | auto idx = std::lower_bound (map.begin (), map.end (), map_key); |
0e9e9abd | 2273 | |
7a5d944b | 2274 | /* std::lower_bound finds the earliest ordered insertion |
0e9e9abd UW |
2275 | point. If the following symbol starts at this exact |
2276 | address, we use that; otherwise, the preceding | |
2277 | exception table entry covers this address. */ | |
7a5d944b | 2278 | if (idx < map.end ()) |
0e9e9abd | 2279 | { |
7a5d944b | 2280 | if (idx->addr == map_key.addr) |
0e9e9abd UW |
2281 | { |
2282 | if (start) | |
7a5d944b TT |
2283 | *start = idx->addr + obj_section_addr (sec); |
2284 | return idx->entry; | |
0e9e9abd UW |
2285 | } |
2286 | } | |
2287 | ||
7a5d944b | 2288 | if (idx > map.begin ()) |
0e9e9abd | 2289 | { |
7a5d944b | 2290 | idx = idx - 1; |
0e9e9abd | 2291 | if (start) |
7a5d944b TT |
2292 | *start = idx->addr + obj_section_addr (sec); |
2293 | return idx->entry; | |
0e9e9abd UW |
2294 | } |
2295 | } | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | return NULL; | |
2300 | } | |
2301 | ||
2302 | /* Given the current frame THIS_FRAME, and its associated frame unwinding | |
2303 | instruction list from the ARM exception table entry ENTRY, allocate and | |
2304 | return a prologue cache structure describing how to unwind this frame. | |
2305 | ||
2306 | Return NULL if the unwinding instruction list contains a "spare", | |
2307 | "reserved" or "refuse to unwind" instruction as defined in section | |
2308 | "9.3 Frame unwinding instructions" of the "Exception Handling ABI | |
2309 | for the ARM Architecture" document. */ | |
2310 | ||
2311 | static struct arm_prologue_cache * | |
2312 | arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry) | |
2313 | { | |
2314 | CORE_ADDR vsp = 0; | |
2315 | int vsp_valid = 0; | |
2316 | ||
2317 | struct arm_prologue_cache *cache; | |
2318 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2319 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2320 | ||
2321 | for (;;) | |
2322 | { | |
2323 | gdb_byte insn; | |
2324 | ||
2325 | /* Whenever we reload SP, we actually have to retrieve its | |
2326 | actual value in the current frame. */ | |
2327 | if (!vsp_valid) | |
2328 | { | |
2329 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2330 | { | |
2331 | int reg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2332 | vsp = get_frame_register_unsigned (this_frame, reg); | |
2333 | } | |
2334 | else | |
2335 | { | |
2336 | CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr; | |
2337 | vsp = get_frame_memory_unsigned (this_frame, addr, 4); | |
2338 | } | |
2339 | ||
2340 | vsp_valid = 1; | |
2341 | } | |
2342 | ||
2343 | /* Decode next unwind instruction. */ | |
2344 | insn = *entry++; | |
2345 | ||
2346 | if ((insn & 0xc0) == 0) | |
2347 | { | |
2348 | int offset = insn & 0x3f; | |
2349 | vsp += (offset << 2) + 4; | |
2350 | } | |
2351 | else if ((insn & 0xc0) == 0x40) | |
2352 | { | |
2353 | int offset = insn & 0x3f; | |
2354 | vsp -= (offset << 2) + 4; | |
2355 | } | |
2356 | else if ((insn & 0xf0) == 0x80) | |
2357 | { | |
2358 | int mask = ((insn & 0xf) << 8) | *entry++; | |
2359 | int i; | |
2360 | ||
2361 | /* The special case of an all-zero mask identifies | |
2362 | "Refuse to unwind". We return NULL to fall back | |
2363 | to the prologue analyzer. */ | |
2364 | if (mask == 0) | |
2365 | return NULL; | |
2366 | ||
2367 | /* Pop registers r4..r15 under mask. */ | |
2368 | for (i = 0; i < 12; i++) | |
2369 | if (mask & (1 << i)) | |
2370 | { | |
2371 | cache->saved_regs[4 + i].addr = vsp; | |
2372 | vsp += 4; | |
2373 | } | |
2374 | ||
2375 | /* Special-case popping SP -- we need to reload vsp. */ | |
2376 | if (mask & (1 << (ARM_SP_REGNUM - 4))) | |
2377 | vsp_valid = 0; | |
2378 | } | |
2379 | else if ((insn & 0xf0) == 0x90) | |
2380 | { | |
2381 | int reg = insn & 0xf; | |
2382 | ||
2383 | /* Reserved cases. */ | |
2384 | if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM) | |
2385 | return NULL; | |
2386 | ||
2387 | /* Set SP from another register and mark VSP for reload. */ | |
2388 | cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg]; | |
2389 | vsp_valid = 0; | |
2390 | } | |
2391 | else if ((insn & 0xf0) == 0xa0) | |
2392 | { | |
2393 | int count = insn & 0x7; | |
2394 | int pop_lr = (insn & 0x8) != 0; | |
2395 | int i; | |
2396 | ||
2397 | /* Pop r4..r[4+count]. */ | |
2398 | for (i = 0; i <= count; i++) | |
2399 | { | |
2400 | cache->saved_regs[4 + i].addr = vsp; | |
2401 | vsp += 4; | |
2402 | } | |
2403 | ||
2404 | /* If indicated by flag, pop LR as well. */ | |
2405 | if (pop_lr) | |
2406 | { | |
2407 | cache->saved_regs[ARM_LR_REGNUM].addr = vsp; | |
2408 | vsp += 4; | |
2409 | } | |
2410 | } | |
2411 | else if (insn == 0xb0) | |
2412 | { | |
2413 | /* We could only have updated PC by popping into it; if so, it | |
2414 | will show up as address. Otherwise, copy LR into PC. */ | |
2415 | if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM)) | |
2416 | cache->saved_regs[ARM_PC_REGNUM] | |
2417 | = cache->saved_regs[ARM_LR_REGNUM]; | |
2418 | ||
2419 | /* We're done. */ | |
2420 | break; | |
2421 | } | |
2422 | else if (insn == 0xb1) | |
2423 | { | |
2424 | int mask = *entry++; | |
2425 | int i; | |
2426 | ||
2427 | /* All-zero mask and mask >= 16 is "spare". */ | |
2428 | if (mask == 0 || mask >= 16) | |
2429 | return NULL; | |
2430 | ||
2431 | /* Pop r0..r3 under mask. */ | |
2432 | for (i = 0; i < 4; i++) | |
2433 | if (mask & (1 << i)) | |
2434 | { | |
2435 | cache->saved_regs[i].addr = vsp; | |
2436 | vsp += 4; | |
2437 | } | |
2438 | } | |
2439 | else if (insn == 0xb2) | |
2440 | { | |
2441 | ULONGEST offset = 0; | |
2442 | unsigned shift = 0; | |
2443 | ||
2444 | do | |
2445 | { | |
2446 | offset |= (*entry & 0x7f) << shift; | |
2447 | shift += 7; | |
2448 | } | |
2449 | while (*entry++ & 0x80); | |
2450 | ||
2451 | vsp += 0x204 + (offset << 2); | |
2452 | } | |
2453 | else if (insn == 0xb3) | |
2454 | { | |
2455 | int start = *entry >> 4; | |
2456 | int count = (*entry++) & 0xf; | |
2457 | int i; | |
2458 | ||
2459 | /* Only registers D0..D15 are valid here. */ | |
2460 | if (start + count >= 16) | |
2461 | return NULL; | |
2462 | ||
2463 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2464 | for (i = 0; i <= count; i++) | |
2465 | { | |
2466 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2467 | vsp += 8; | |
2468 | } | |
2469 | ||
2470 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2471 | vsp += 4; | |
2472 | } | |
2473 | else if ((insn & 0xf8) == 0xb8) | |
2474 | { | |
2475 | int count = insn & 0x7; | |
2476 | int i; | |
2477 | ||
2478 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2479 | for (i = 0; i <= count; i++) | |
2480 | { | |
2481 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2482 | vsp += 8; | |
2483 | } | |
2484 | ||
2485 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2486 | vsp += 4; | |
2487 | } | |
2488 | else if (insn == 0xc6) | |
2489 | { | |
2490 | int start = *entry >> 4; | |
2491 | int count = (*entry++) & 0xf; | |
2492 | int i; | |
2493 | ||
2494 | /* Only registers WR0..WR15 are valid. */ | |
2495 | if (start + count >= 16) | |
2496 | return NULL; | |
2497 | ||
2498 | /* Pop iwmmx registers WR[start]..WR[start+count]. */ | |
2499 | for (i = 0; i <= count; i++) | |
2500 | { | |
2501 | cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp; | |
2502 | vsp += 8; | |
2503 | } | |
2504 | } | |
2505 | else if (insn == 0xc7) | |
2506 | { | |
2507 | int mask = *entry++; | |
2508 | int i; | |
2509 | ||
2510 | /* All-zero mask and mask >= 16 is "spare". */ | |
2511 | if (mask == 0 || mask >= 16) | |
2512 | return NULL; | |
2513 | ||
2514 | /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */ | |
2515 | for (i = 0; i < 4; i++) | |
2516 | if (mask & (1 << i)) | |
2517 | { | |
2518 | cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp; | |
2519 | vsp += 4; | |
2520 | } | |
2521 | } | |
2522 | else if ((insn & 0xf8) == 0xc0) | |
2523 | { | |
2524 | int count = insn & 0x7; | |
2525 | int i; | |
2526 | ||
2527 | /* Pop iwmmx registers WR[10]..WR[10+count]. */ | |
2528 | for (i = 0; i <= count; i++) | |
2529 | { | |
2530 | cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp; | |
2531 | vsp += 8; | |
2532 | } | |
2533 | } | |
2534 | else if (insn == 0xc8) | |
2535 | { | |
2536 | int start = *entry >> 4; | |
2537 | int count = (*entry++) & 0xf; | |
2538 | int i; | |
2539 | ||
2540 | /* Only registers D0..D31 are valid. */ | |
2541 | if (start + count >= 16) | |
2542 | return NULL; | |
2543 | ||
2544 | /* Pop VFP double-precision registers | |
2545 | D[16+start]..D[16+start+count]. */ | |
2546 | for (i = 0; i <= count; i++) | |
2547 | { | |
2548 | cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp; | |
2549 | vsp += 8; | |
2550 | } | |
2551 | } | |
2552 | else if (insn == 0xc9) | |
2553 | { | |
2554 | int start = *entry >> 4; | |
2555 | int count = (*entry++) & 0xf; | |
2556 | int i; | |
2557 | ||
2558 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2559 | for (i = 0; i <= count; i++) | |
2560 | { | |
2561 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2562 | vsp += 8; | |
2563 | } | |
2564 | } | |
2565 | else if ((insn & 0xf8) == 0xd0) | |
2566 | { | |
2567 | int count = insn & 0x7; | |
2568 | int i; | |
2569 | ||
2570 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2571 | for (i = 0; i <= count; i++) | |
2572 | { | |
2573 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2574 | vsp += 8; | |
2575 | } | |
2576 | } | |
2577 | else | |
2578 | { | |
2579 | /* Everything else is "spare". */ | |
2580 | return NULL; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | /* If we restore SP from a register, assume this was the frame register. | |
2585 | Otherwise just fall back to SP as frame register. */ | |
2586 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2587 | cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2588 | else | |
2589 | cache->framereg = ARM_SP_REGNUM; | |
2590 | ||
2591 | /* Determine offset to previous frame. */ | |
2592 | cache->framesize | |
2593 | = vsp - get_frame_register_unsigned (this_frame, cache->framereg); | |
2594 | ||
2595 | /* We already got the previous SP. */ | |
2596 | cache->prev_sp = vsp; | |
2597 | ||
2598 | return cache; | |
2599 | } | |
2600 | ||
2601 | /* Unwinding via ARM exception table entries. Note that the sniffer | |
2602 | already computes a filled-in prologue cache, which is then used | |
2603 | with the same arm_prologue_this_id and arm_prologue_prev_register | |
2604 | routines also used for prologue-parsing based unwinding. */ | |
2605 | ||
2606 | static int | |
2607 | arm_exidx_unwind_sniffer (const struct frame_unwind *self, | |
2608 | struct frame_info *this_frame, | |
2609 | void **this_prologue_cache) | |
2610 | { | |
2611 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2612 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
2613 | CORE_ADDR addr_in_block, exidx_region, func_start; | |
2614 | struct arm_prologue_cache *cache; | |
2615 | gdb_byte *entry; | |
2616 | ||
2617 | /* See if we have an ARM exception table entry covering this address. */ | |
2618 | addr_in_block = get_frame_address_in_block (this_frame); | |
2619 | entry = arm_find_exidx_entry (addr_in_block, &exidx_region); | |
2620 | if (!entry) | |
2621 | return 0; | |
2622 | ||
2623 | /* The ARM exception table does not describe unwind information | |
2624 | for arbitrary PC values, but is guaranteed to be correct only | |
2625 | at call sites. We have to decide here whether we want to use | |
2626 | ARM exception table information for this frame, or fall back | |
2627 | to using prologue parsing. (Note that if we have DWARF CFI, | |
2628 | this sniffer isn't even called -- CFI is always preferred.) | |
2629 | ||
2630 | Before we make this decision, however, we check whether we | |
2631 | actually have *symbol* information for the current frame. | |
2632 | If not, prologue parsing would not work anyway, so we might | |
2633 | as well use the exception table and hope for the best. */ | |
2634 | if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL)) | |
2635 | { | |
2636 | int exc_valid = 0; | |
2637 | ||
2638 | /* If the next frame is "normal", we are at a call site in this | |
2639 | frame, so exception information is guaranteed to be valid. */ | |
2640 | if (get_next_frame (this_frame) | |
2641 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) | |
2642 | exc_valid = 1; | |
2643 | ||
2644 | /* We also assume exception information is valid if we're currently | |
2645 | blocked in a system call. The system library is supposed to | |
d9311bfa AT |
2646 | ensure this, so that e.g. pthread cancellation works. */ |
2647 | if (arm_frame_is_thumb (this_frame)) | |
0e9e9abd | 2648 | { |
7913a64c | 2649 | ULONGEST insn; |
416dc9c6 | 2650 | |
7913a64c YQ |
2651 | if (safe_read_memory_unsigned_integer (get_frame_pc (this_frame) - 2, |
2652 | 2, byte_order_for_code, &insn) | |
d9311bfa AT |
2653 | && (insn & 0xff00) == 0xdf00 /* svc */) |
2654 | exc_valid = 1; | |
0e9e9abd | 2655 | } |
d9311bfa AT |
2656 | else |
2657 | { | |
7913a64c | 2658 | ULONGEST insn; |
416dc9c6 | 2659 | |
7913a64c YQ |
2660 | if (safe_read_memory_unsigned_integer (get_frame_pc (this_frame) - 4, |
2661 | 4, byte_order_for_code, &insn) | |
d9311bfa AT |
2662 | && (insn & 0x0f000000) == 0x0f000000 /* svc */) |
2663 | exc_valid = 1; | |
2664 | } | |
2665 | ||
0e9e9abd UW |
2666 | /* Bail out if we don't know that exception information is valid. */ |
2667 | if (!exc_valid) | |
2668 | return 0; | |
2669 | ||
2670 | /* The ARM exception index does not mark the *end* of the region | |
2671 | covered by the entry, and some functions will not have any entry. | |
2672 | To correctly recognize the end of the covered region, the linker | |
2673 | should have inserted dummy records with a CANTUNWIND marker. | |
2674 | ||
2675 | Unfortunately, current versions of GNU ld do not reliably do | |
2676 | this, and thus we may have found an incorrect entry above. | |
2677 | As a (temporary) sanity check, we only use the entry if it | |
2678 | lies *within* the bounds of the function. Note that this check | |
2679 | might reject perfectly valid entries that just happen to cover | |
2680 | multiple functions; therefore this check ought to be removed | |
2681 | once the linker is fixed. */ | |
2682 | if (func_start > exidx_region) | |
2683 | return 0; | |
2684 | } | |
2685 | ||
2686 | /* Decode the list of unwinding instructions into a prologue cache. | |
2687 | Note that this may fail due to e.g. a "refuse to unwind" code. */ | |
2688 | cache = arm_exidx_fill_cache (this_frame, entry); | |
2689 | if (!cache) | |
2690 | return 0; | |
2691 | ||
2692 | *this_prologue_cache = cache; | |
2693 | return 1; | |
2694 | } | |
2695 | ||
2696 | struct frame_unwind arm_exidx_unwind = { | |
2697 | NORMAL_FRAME, | |
8fbca658 | 2698 | default_frame_unwind_stop_reason, |
0e9e9abd UW |
2699 | arm_prologue_this_id, |
2700 | arm_prologue_prev_register, | |
2701 | NULL, | |
2702 | arm_exidx_unwind_sniffer | |
2703 | }; | |
2704 | ||
779aa56f YQ |
2705 | static struct arm_prologue_cache * |
2706 | arm_make_epilogue_frame_cache (struct frame_info *this_frame) | |
2707 | { | |
2708 | struct arm_prologue_cache *cache; | |
779aa56f YQ |
2709 | int reg; |
2710 | ||
2711 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2712 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2713 | ||
2714 | /* Still rely on the offset calculated from prologue. */ | |
2715 | arm_scan_prologue (this_frame, cache); | |
2716 | ||
2717 | /* Since we are in epilogue, the SP has been restored. */ | |
2718 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); | |
2719 | ||
2720 | /* Calculate actual addresses of saved registers using offsets | |
2721 | determined by arm_scan_prologue. */ | |
2722 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) | |
2723 | if (trad_frame_addr_p (cache->saved_regs, reg)) | |
2724 | cache->saved_regs[reg].addr += cache->prev_sp; | |
2725 | ||
2726 | return cache; | |
2727 | } | |
2728 | ||
2729 | /* Implementation of function hook 'this_id' in | |
2730 | 'struct frame_uwnind' for epilogue unwinder. */ | |
2731 | ||
2732 | static void | |
2733 | arm_epilogue_frame_this_id (struct frame_info *this_frame, | |
2734 | void **this_cache, | |
2735 | struct frame_id *this_id) | |
2736 | { | |
2737 | struct arm_prologue_cache *cache; | |
2738 | CORE_ADDR pc, func; | |
2739 | ||
2740 | if (*this_cache == NULL) | |
2741 | *this_cache = arm_make_epilogue_frame_cache (this_frame); | |
2742 | cache = (struct arm_prologue_cache *) *this_cache; | |
2743 | ||
2744 | /* Use function start address as part of the frame ID. If we cannot | |
2745 | identify the start address (due to missing symbol information), | |
2746 | fall back to just using the current PC. */ | |
2747 | pc = get_frame_pc (this_frame); | |
2748 | func = get_frame_func (this_frame); | |
fb3f3d25 | 2749 | if (func == 0) |
779aa56f YQ |
2750 | func = pc; |
2751 | ||
2752 | (*this_id) = frame_id_build (cache->prev_sp, pc); | |
2753 | } | |
2754 | ||
2755 | /* Implementation of function hook 'prev_register' in | |
2756 | 'struct frame_uwnind' for epilogue unwinder. */ | |
2757 | ||
2758 | static struct value * | |
2759 | arm_epilogue_frame_prev_register (struct frame_info *this_frame, | |
2760 | void **this_cache, int regnum) | |
2761 | { | |
779aa56f YQ |
2762 | if (*this_cache == NULL) |
2763 | *this_cache = arm_make_epilogue_frame_cache (this_frame); | |
779aa56f YQ |
2764 | |
2765 | return arm_prologue_prev_register (this_frame, this_cache, regnum); | |
2766 | } | |
2767 | ||
2768 | static int arm_stack_frame_destroyed_p_1 (struct gdbarch *gdbarch, | |
2769 | CORE_ADDR pc); | |
2770 | static int thumb_stack_frame_destroyed_p (struct gdbarch *gdbarch, | |
2771 | CORE_ADDR pc); | |
2772 | ||
2773 | /* Implementation of function hook 'sniffer' in | |
2774 | 'struct frame_uwnind' for epilogue unwinder. */ | |
2775 | ||
2776 | static int | |
2777 | arm_epilogue_frame_sniffer (const struct frame_unwind *self, | |
2778 | struct frame_info *this_frame, | |
2779 | void **this_prologue_cache) | |
2780 | { | |
2781 | if (frame_relative_level (this_frame) == 0) | |
2782 | { | |
2783 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2784 | CORE_ADDR pc = get_frame_pc (this_frame); | |
2785 | ||
2786 | if (arm_frame_is_thumb (this_frame)) | |
2787 | return thumb_stack_frame_destroyed_p (gdbarch, pc); | |
2788 | else | |
2789 | return arm_stack_frame_destroyed_p_1 (gdbarch, pc); | |
2790 | } | |
2791 | else | |
2792 | return 0; | |
2793 | } | |
2794 | ||
2795 | /* Frame unwinder from epilogue. */ | |
2796 | ||
2797 | static const struct frame_unwind arm_epilogue_frame_unwind = | |
2798 | { | |
2799 | NORMAL_FRAME, | |
2800 | default_frame_unwind_stop_reason, | |
2801 | arm_epilogue_frame_this_id, | |
2802 | arm_epilogue_frame_prev_register, | |
2803 | NULL, | |
2804 | arm_epilogue_frame_sniffer, | |
2805 | }; | |
2806 | ||
80d8d390 YQ |
2807 | /* Recognize GCC's trampoline for thumb call-indirect. If we are in a |
2808 | trampoline, return the target PC. Otherwise return 0. | |
2809 | ||
2810 | void call0a (char c, short s, int i, long l) {} | |
2811 | ||
2812 | int main (void) | |
2813 | { | |
2814 | (*pointer_to_call0a) (c, s, i, l); | |
2815 | } | |
2816 | ||
2817 | Instead of calling a stub library function _call_via_xx (xx is | |
2818 | the register name), GCC may inline the trampoline in the object | |
2819 | file as below (register r2 has the address of call0a). | |
2820 | ||
2821 | .global main | |
2822 | .type main, %function | |
2823 | ... | |
2824 | bl .L1 | |
2825 | ... | |
2826 | .size main, .-main | |
2827 | ||
2828 | .L1: | |
2829 | bx r2 | |
2830 | ||
2831 | The trampoline 'bx r2' doesn't belong to main. */ | |
2832 | ||
2833 | static CORE_ADDR | |
2834 | arm_skip_bx_reg (struct frame_info *frame, CORE_ADDR pc) | |
2835 | { | |
2836 | /* The heuristics of recognizing such trampoline is that FRAME is | |
2837 | executing in Thumb mode and the instruction on PC is 'bx Rm'. */ | |
2838 | if (arm_frame_is_thumb (frame)) | |
2839 | { | |
2840 | gdb_byte buf[2]; | |
2841 | ||
2842 | if (target_read_memory (pc, buf, 2) == 0) | |
2843 | { | |
2844 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
2845 | enum bfd_endian byte_order_for_code | |
2846 | = gdbarch_byte_order_for_code (gdbarch); | |
2847 | uint16_t insn | |
2848 | = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
2849 | ||
2850 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
2851 | { | |
2852 | CORE_ADDR dest | |
2853 | = get_frame_register_unsigned (frame, bits (insn, 3, 6)); | |
2854 | ||
2855 | /* Clear the LSB so that gdb core sets step-resume | |
2856 | breakpoint at the right address. */ | |
2857 | return UNMAKE_THUMB_ADDR (dest); | |
2858 | } | |
2859 | } | |
2860 | } | |
2861 | ||
2862 | return 0; | |
2863 | } | |
2864 | ||
909cf6ea | 2865 | static struct arm_prologue_cache * |
a262aec2 | 2866 | arm_make_stub_cache (struct frame_info *this_frame) |
909cf6ea | 2867 | { |
909cf6ea | 2868 | struct arm_prologue_cache *cache; |
909cf6ea | 2869 | |
35d5d4ee | 2870 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2871 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
909cf6ea | 2872 | |
a262aec2 | 2873 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); |
909cf6ea DJ |
2874 | |
2875 | return cache; | |
2876 | } | |
2877 | ||
2878 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2879 | ||
2880 | static void | |
a262aec2 | 2881 | arm_stub_this_id (struct frame_info *this_frame, |
909cf6ea DJ |
2882 | void **this_cache, |
2883 | struct frame_id *this_id) | |
2884 | { | |
2885 | struct arm_prologue_cache *cache; | |
2886 | ||
2887 | if (*this_cache == NULL) | |
a262aec2 | 2888 | *this_cache = arm_make_stub_cache (this_frame); |
9a3c8263 | 2889 | cache = (struct arm_prologue_cache *) *this_cache; |
909cf6ea | 2890 | |
a262aec2 | 2891 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
909cf6ea DJ |
2892 | } |
2893 | ||
a262aec2 DJ |
2894 | static int |
2895 | arm_stub_unwind_sniffer (const struct frame_unwind *self, | |
2896 | struct frame_info *this_frame, | |
2897 | void **this_prologue_cache) | |
909cf6ea | 2898 | { |
93d42b30 | 2899 | CORE_ADDR addr_in_block; |
948f8e3d | 2900 | gdb_byte dummy[4]; |
18d18ac8 YQ |
2901 | CORE_ADDR pc, start_addr; |
2902 | const char *name; | |
909cf6ea | 2903 | |
a262aec2 | 2904 | addr_in_block = get_frame_address_in_block (this_frame); |
18d18ac8 | 2905 | pc = get_frame_pc (this_frame); |
3e5d3a5a | 2906 | if (in_plt_section (addr_in_block) |
fc36e839 DE |
2907 | /* We also use the stub winder if the target memory is unreadable |
2908 | to avoid having the prologue unwinder trying to read it. */ | |
18d18ac8 YQ |
2909 | || target_read_memory (pc, dummy, 4) != 0) |
2910 | return 1; | |
2911 | ||
2912 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0 | |
2913 | && arm_skip_bx_reg (this_frame, pc) != 0) | |
a262aec2 | 2914 | return 1; |
909cf6ea | 2915 | |
a262aec2 | 2916 | return 0; |
909cf6ea DJ |
2917 | } |
2918 | ||
a262aec2 DJ |
2919 | struct frame_unwind arm_stub_unwind = { |
2920 | NORMAL_FRAME, | |
8fbca658 | 2921 | default_frame_unwind_stop_reason, |
a262aec2 DJ |
2922 | arm_stub_this_id, |
2923 | arm_prologue_prev_register, | |
2924 | NULL, | |
2925 | arm_stub_unwind_sniffer | |
2926 | }; | |
2927 | ||
2ae28aa9 YQ |
2928 | /* Put here the code to store, into CACHE->saved_regs, the addresses |
2929 | of the saved registers of frame described by THIS_FRAME. CACHE is | |
2930 | returned. */ | |
2931 | ||
2932 | static struct arm_prologue_cache * | |
2933 | arm_m_exception_cache (struct frame_info *this_frame) | |
2934 | { | |
2935 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2936 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
2937 | struct arm_prologue_cache *cache; | |
55ea94da FH |
2938 | CORE_ADDR lr; |
2939 | CORE_ADDR sp; | |
2ae28aa9 YQ |
2940 | CORE_ADDR unwound_sp; |
2941 | LONGEST xpsr; | |
55ea94da FH |
2942 | uint32_t exc_return; |
2943 | uint32_t process_stack_used; | |
2944 | uint32_t extended_frame_used; | |
2945 | uint32_t secure_stack_used; | |
2ae28aa9 YQ |
2946 | |
2947 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2948 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2949 | ||
55ea94da FH |
2950 | /* ARMv7-M Architecture Reference "B1.5.6 Exception entry behavior" |
2951 | describes which bits in LR that define which stack was used prior | |
2952 | to the exception and if FPU is used (causing extended stack frame). */ | |
2953 | ||
2954 | lr = get_frame_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2955 | sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); | |
2956 | ||
2957 | /* Check EXC_RETURN indicator bits. */ | |
2958 | exc_return = (((lr >> 28) & 0xf) == 0xf); | |
2959 | ||
2960 | /* Check EXC_RETURN bit SPSEL if Main or Thread (process) stack used. */ | |
2961 | process_stack_used = ((lr & (1 << 2)) != 0); | |
2962 | if (exc_return && process_stack_used) | |
2963 | { | |
2964 | /* Thread (process) stack used. | |
2965 | Potentially this could be other register defined by target, but PSP | |
2966 | can be considered a standard name for the "Process Stack Pointer". | |
2967 | To be fully aware of system registers like MSP and PSP, these could | |
2968 | be added to a separate XML arm-m-system-profile that is valid for | |
2969 | ARMv6-M and ARMv7-M architectures. Also to be able to debug eg a | |
2970 | corefile off-line, then these registers must be defined by GDB, | |
2971 | and also be included in the corefile regsets. */ | |
2972 | ||
2973 | int psp_regnum = user_reg_map_name_to_regnum (gdbarch, "psp", -1); | |
2974 | if (psp_regnum == -1) | |
2975 | { | |
2976 | /* Thread (process) stack could not be fetched, | |
2977 | give warning and exit. */ | |
2978 | ||
2979 | warning (_("no PSP thread stack unwinding supported.")); | |
2980 | ||
2981 | /* Terminate any further stack unwinding by refer to self. */ | |
2982 | cache->prev_sp = sp; | |
2983 | return cache; | |
2984 | } | |
2985 | else | |
2986 | { | |
2987 | /* Thread (process) stack used, use PSP as SP. */ | |
2988 | unwound_sp = get_frame_register_unsigned (this_frame, psp_regnum); | |
2989 | } | |
2990 | } | |
2991 | else | |
2992 | { | |
2993 | /* Main stack used, use MSP as SP. */ | |
2994 | unwound_sp = sp; | |
2995 | } | |
2ae28aa9 YQ |
2996 | |
2997 | /* The hardware saves eight 32-bit words, comprising xPSR, | |
2998 | ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in | |
2999 | "B1.5.6 Exception entry behavior" in | |
3000 | "ARMv7-M Architecture Reference Manual". */ | |
3001 | cache->saved_regs[0].addr = unwound_sp; | |
3002 | cache->saved_regs[1].addr = unwound_sp + 4; | |
3003 | cache->saved_regs[2].addr = unwound_sp + 8; | |
3004 | cache->saved_regs[3].addr = unwound_sp + 12; | |
55ea94da FH |
3005 | cache->saved_regs[ARM_IP_REGNUM].addr = unwound_sp + 16; |
3006 | cache->saved_regs[ARM_LR_REGNUM].addr = unwound_sp + 20; | |
3007 | cache->saved_regs[ARM_PC_REGNUM].addr = unwound_sp + 24; | |
2ae28aa9 YQ |
3008 | cache->saved_regs[ARM_PS_REGNUM].addr = unwound_sp + 28; |
3009 | ||
55ea94da FH |
3010 | /* Check EXC_RETURN bit FTYPE if extended stack frame (FPU regs stored) |
3011 | type used. */ | |
3012 | extended_frame_used = ((lr & (1 << 4)) == 0); | |
3013 | if (exc_return && extended_frame_used) | |
3014 | { | |
3015 | int i; | |
3016 | int fpu_regs_stack_offset; | |
3017 | ||
3018 | /* This code does not take into account the lazy stacking, see "Lazy | |
3019 | context save of FP state", in B1.5.7, also ARM AN298, supported | |
3020 | by Cortex-M4F architecture. | |
3021 | To fully handle this the FPCCR register (Floating-point Context | |
3022 | Control Register) needs to be read out and the bits ASPEN and LSPEN | |
3023 | could be checked to setup correct lazy stacked FP registers. | |
3024 | This register is located at address 0xE000EF34. */ | |
3025 | ||
3026 | /* Extended stack frame type used. */ | |
3027 | fpu_regs_stack_offset = unwound_sp + 0x20; | |
3028 | for (i = 0; i < 16; i++) | |
3029 | { | |
3030 | cache->saved_regs[ARM_D0_REGNUM + i].addr = fpu_regs_stack_offset; | |
3031 | fpu_regs_stack_offset += 4; | |
3032 | } | |
3033 | cache->saved_regs[ARM_FPSCR_REGNUM].addr = unwound_sp + 0x60; | |
3034 | ||
3035 | /* Offset 0x64 is reserved. */ | |
3036 | cache->prev_sp = unwound_sp + 0x68; | |
3037 | } | |
3038 | else | |
3039 | { | |
3040 | /* Standard stack frame type used. */ | |
3041 | cache->prev_sp = unwound_sp + 0x20; | |
3042 | } | |
3043 | ||
3044 | /* Check EXC_RETURN bit S if Secure or Non-secure stack used. */ | |
3045 | secure_stack_used = ((lr & (1 << 6)) != 0); | |
3046 | if (exc_return && secure_stack_used) | |
3047 | { | |
3048 | /* ARMv8-M Exception and interrupt handling is not considered here. | |
3049 | In the ARMv8-M architecture also EXC_RETURN bit S is controlling if | |
3050 | the Secure or Non-secure stack was used. To separate Secure and | |
3051 | Non-secure stacks, processors that are based on the ARMv8-M | |
3052 | architecture support 4 stack pointers: MSP_S, PSP_S, MSP_NS, PSP_NS. | |
3053 | In addition, a stack limit feature is provided using stack limit | |
3054 | registers (accessible using MSR and MRS instructions) in Privileged | |
3055 | level. */ | |
3056 | } | |
3057 | ||
2ae28aa9 YQ |
3058 | /* If bit 9 of the saved xPSR is set, then there is a four-byte |
3059 | aligner between the top of the 32-byte stack frame and the | |
3060 | previous context's stack pointer. */ | |
2ae28aa9 YQ |
3061 | if (safe_read_memory_integer (unwound_sp + 28, 4, byte_order, &xpsr) |
3062 | && (xpsr & (1 << 9)) != 0) | |
3063 | cache->prev_sp += 4; | |
3064 | ||
3065 | return cache; | |
3066 | } | |
3067 | ||
3068 | /* Implementation of function hook 'this_id' in | |
3069 | 'struct frame_uwnind'. */ | |
3070 | ||
3071 | static void | |
3072 | arm_m_exception_this_id (struct frame_info *this_frame, | |
3073 | void **this_cache, | |
3074 | struct frame_id *this_id) | |
3075 | { | |
3076 | struct arm_prologue_cache *cache; | |
3077 | ||
3078 | if (*this_cache == NULL) | |
3079 | *this_cache = arm_m_exception_cache (this_frame); | |
9a3c8263 | 3080 | cache = (struct arm_prologue_cache *) *this_cache; |
2ae28aa9 YQ |
3081 | |
3082 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
3083 | *this_id = frame_id_build (cache->prev_sp, | |
3084 | get_frame_pc (this_frame)); | |
3085 | } | |
3086 | ||
3087 | /* Implementation of function hook 'prev_register' in | |
3088 | 'struct frame_uwnind'. */ | |
3089 | ||
3090 | static struct value * | |
3091 | arm_m_exception_prev_register (struct frame_info *this_frame, | |
3092 | void **this_cache, | |
3093 | int prev_regnum) | |
3094 | { | |
2ae28aa9 YQ |
3095 | struct arm_prologue_cache *cache; |
3096 | ||
3097 | if (*this_cache == NULL) | |
3098 | *this_cache = arm_m_exception_cache (this_frame); | |
9a3c8263 | 3099 | cache = (struct arm_prologue_cache *) *this_cache; |
2ae28aa9 YQ |
3100 | |
3101 | /* The value was already reconstructed into PREV_SP. */ | |
3102 | if (prev_regnum == ARM_SP_REGNUM) | |
3103 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
3104 | cache->prev_sp); | |
3105 | ||
3106 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, | |
3107 | prev_regnum); | |
3108 | } | |
3109 | ||
3110 | /* Implementation of function hook 'sniffer' in | |
3111 | 'struct frame_uwnind'. */ | |
3112 | ||
3113 | static int | |
3114 | arm_m_exception_unwind_sniffer (const struct frame_unwind *self, | |
3115 | struct frame_info *this_frame, | |
3116 | void **this_prologue_cache) | |
3117 | { | |
3118 | CORE_ADDR this_pc = get_frame_pc (this_frame); | |
3119 | ||
3120 | /* No need to check is_m; this sniffer is only registered for | |
3121 | M-profile architectures. */ | |
3122 | ||
ca90e760 FH |
3123 | /* Check if exception frame returns to a magic PC value. */ |
3124 | return arm_m_addr_is_magic (this_pc); | |
2ae28aa9 YQ |
3125 | } |
3126 | ||
3127 | /* Frame unwinder for M-profile exceptions. */ | |
3128 | ||
3129 | struct frame_unwind arm_m_exception_unwind = | |
3130 | { | |
3131 | SIGTRAMP_FRAME, | |
3132 | default_frame_unwind_stop_reason, | |
3133 | arm_m_exception_this_id, | |
3134 | arm_m_exception_prev_register, | |
3135 | NULL, | |
3136 | arm_m_exception_unwind_sniffer | |
3137 | }; | |
3138 | ||
24de872b | 3139 | static CORE_ADDR |
a262aec2 | 3140 | arm_normal_frame_base (struct frame_info *this_frame, void **this_cache) |
24de872b DJ |
3141 | { |
3142 | struct arm_prologue_cache *cache; | |
3143 | ||
eb5492fa | 3144 | if (*this_cache == NULL) |
a262aec2 | 3145 | *this_cache = arm_make_prologue_cache (this_frame); |
9a3c8263 | 3146 | cache = (struct arm_prologue_cache *) *this_cache; |
eb5492fa | 3147 | |
4be43953 | 3148 | return cache->prev_sp - cache->framesize; |
24de872b DJ |
3149 | } |
3150 | ||
eb5492fa DJ |
3151 | struct frame_base arm_normal_base = { |
3152 | &arm_prologue_unwind, | |
3153 | arm_normal_frame_base, | |
3154 | arm_normal_frame_base, | |
3155 | arm_normal_frame_base | |
3156 | }; | |
3157 | ||
b39cc962 DJ |
3158 | static struct value * |
3159 | arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, | |
3160 | int regnum) | |
3161 | { | |
24568a2c | 3162 | struct gdbarch * gdbarch = get_frame_arch (this_frame); |
b39cc962 | 3163 | CORE_ADDR lr, cpsr; |
9779414d | 3164 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
3165 | |
3166 | switch (regnum) | |
3167 | { | |
3168 | case ARM_PC_REGNUM: | |
3169 | /* The PC is normally copied from the return column, which | |
3170 | describes saves of LR. However, that version may have an | |
3171 | extra bit set to indicate Thumb state. The bit is not | |
3172 | part of the PC. */ | |
3173 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
3174 | return frame_unwind_got_constant (this_frame, regnum, | |
24568a2c | 3175 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 DJ |
3176 | |
3177 | case ARM_PS_REGNUM: | |
3178 | /* Reconstruct the T bit; see arm_prologue_prev_register for details. */ | |
ca38c58e | 3179 | cpsr = get_frame_register_unsigned (this_frame, regnum); |
b39cc962 DJ |
3180 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
3181 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 3182 | cpsr |= t_bit; |
b39cc962 | 3183 | else |
9779414d | 3184 | cpsr &= ~t_bit; |
ca38c58e | 3185 | return frame_unwind_got_constant (this_frame, regnum, cpsr); |
b39cc962 DJ |
3186 | |
3187 | default: | |
3188 | internal_error (__FILE__, __LINE__, | |
3189 | _("Unexpected register %d"), regnum); | |
3190 | } | |
3191 | } | |
3192 | ||
3193 | static void | |
3194 | arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
3195 | struct dwarf2_frame_state_reg *reg, | |
3196 | struct frame_info *this_frame) | |
3197 | { | |
3198 | switch (regnum) | |
3199 | { | |
3200 | case ARM_PC_REGNUM: | |
3201 | case ARM_PS_REGNUM: | |
3202 | reg->how = DWARF2_FRAME_REG_FN; | |
3203 | reg->loc.fn = arm_dwarf2_prev_register; | |
3204 | break; | |
3205 | case ARM_SP_REGNUM: | |
3206 | reg->how = DWARF2_FRAME_REG_CFA; | |
3207 | break; | |
3208 | } | |
3209 | } | |
3210 | ||
c9cf6e20 | 3211 | /* Implement the stack_frame_destroyed_p gdbarch method. */ |
4024ca99 UW |
3212 | |
3213 | static int | |
c9cf6e20 | 3214 | thumb_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
4024ca99 UW |
3215 | { |
3216 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3217 | unsigned int insn, insn2; | |
3218 | int found_return = 0, found_stack_adjust = 0; | |
3219 | CORE_ADDR func_start, func_end; | |
3220 | CORE_ADDR scan_pc; | |
3221 | gdb_byte buf[4]; | |
3222 | ||
3223 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3224 | return 0; | |
3225 | ||
3226 | /* The epilogue is a sequence of instructions along the following lines: | |
3227 | ||
3228 | - add stack frame size to SP or FP | |
3229 | - [if frame pointer used] restore SP from FP | |
3230 | - restore registers from SP [may include PC] | |
3231 | - a return-type instruction [if PC wasn't already restored] | |
3232 | ||
3233 | In a first pass, we scan forward from the current PC and verify the | |
3234 | instructions we find as compatible with this sequence, ending in a | |
3235 | return instruction. | |
3236 | ||
3237 | However, this is not sufficient to distinguish indirect function calls | |
3238 | within a function from indirect tail calls in the epilogue in some cases. | |
3239 | Therefore, if we didn't already find any SP-changing instruction during | |
3240 | forward scan, we add a backward scanning heuristic to ensure we actually | |
3241 | are in the epilogue. */ | |
3242 | ||
3243 | scan_pc = pc; | |
3244 | while (scan_pc < func_end && !found_return) | |
3245 | { | |
3246 | if (target_read_memory (scan_pc, buf, 2)) | |
3247 | break; | |
3248 | ||
3249 | scan_pc += 2; | |
3250 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3251 | ||
3252 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
3253 | found_return = 1; | |
3254 | else if (insn == 0x46f7) /* mov pc, lr */ | |
3255 | found_return = 1; | |
540314bd | 3256 | else if (thumb_instruction_restores_sp (insn)) |
4024ca99 | 3257 | { |
b7576e5c | 3258 | if ((insn & 0xff00) == 0xbd00) /* pop <registers, PC> */ |
4024ca99 UW |
3259 | found_return = 1; |
3260 | } | |
db24da6d | 3261 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instruction */ |
4024ca99 UW |
3262 | { |
3263 | if (target_read_memory (scan_pc, buf, 2)) | |
3264 | break; | |
3265 | ||
3266 | scan_pc += 2; | |
3267 | insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3268 | ||
3269 | if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3270 | { | |
4024ca99 UW |
3271 | if (insn2 & 0x8000) /* <registers> include PC. */ |
3272 | found_return = 1; | |
3273 | } | |
3274 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3275 | && (insn2 & 0x0fff) == 0x0b04) | |
3276 | { | |
4024ca99 UW |
3277 | if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */ |
3278 | found_return = 1; | |
3279 | } | |
3280 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3281 | && (insn2 & 0x0e00) == 0x0a00) | |
6b65d1b6 | 3282 | ; |
4024ca99 UW |
3283 | else |
3284 | break; | |
3285 | } | |
3286 | else | |
3287 | break; | |
3288 | } | |
3289 | ||
3290 | if (!found_return) | |
3291 | return 0; | |
3292 | ||
3293 | /* Since any instruction in the epilogue sequence, with the possible | |
3294 | exception of return itself, updates the stack pointer, we need to | |
3295 | scan backwards for at most one instruction. Try either a 16-bit or | |
3296 | a 32-bit instruction. This is just a heuristic, so we do not worry | |
0963b4bd | 3297 | too much about false positives. */ |
4024ca99 | 3298 | |
6b65d1b6 YQ |
3299 | if (pc - 4 < func_start) |
3300 | return 0; | |
3301 | if (target_read_memory (pc - 4, buf, 4)) | |
3302 | return 0; | |
4024ca99 | 3303 | |
6b65d1b6 YQ |
3304 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); |
3305 | insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code); | |
3306 | ||
3307 | if (thumb_instruction_restores_sp (insn2)) | |
3308 | found_stack_adjust = 1; | |
3309 | else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3310 | found_stack_adjust = 1; | |
3311 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3312 | && (insn2 & 0x0fff) == 0x0b04) | |
3313 | found_stack_adjust = 1; | |
3314 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3315 | && (insn2 & 0x0e00) == 0x0a00) | |
3316 | found_stack_adjust = 1; | |
4024ca99 UW |
3317 | |
3318 | return found_stack_adjust; | |
3319 | } | |
3320 | ||
4024ca99 | 3321 | static int |
c58b006a | 3322 | arm_stack_frame_destroyed_p_1 (struct gdbarch *gdbarch, CORE_ADDR pc) |
4024ca99 UW |
3323 | { |
3324 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3325 | unsigned int insn; | |
f303bc3e | 3326 | int found_return; |
4024ca99 UW |
3327 | CORE_ADDR func_start, func_end; |
3328 | ||
4024ca99 UW |
3329 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) |
3330 | return 0; | |
3331 | ||
3332 | /* We are in the epilogue if the previous instruction was a stack | |
3333 | adjustment and the next instruction is a possible return (bx, mov | |
3334 | pc, or pop). We could have to scan backwards to find the stack | |
3335 | adjustment, or forwards to find the return, but this is a decent | |
3336 | approximation. First scan forwards. */ | |
3337 | ||
3338 | found_return = 0; | |
3339 | insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
3340 | if (bits (insn, 28, 31) != INST_NV) | |
3341 | { | |
3342 | if ((insn & 0x0ffffff0) == 0x012fff10) | |
3343 | /* BX. */ | |
3344 | found_return = 1; | |
3345 | else if ((insn & 0x0ffffff0) == 0x01a0f000) | |
3346 | /* MOV PC. */ | |
3347 | found_return = 1; | |
3348 | else if ((insn & 0x0fff0000) == 0x08bd0000 | |
3349 | && (insn & 0x0000c000) != 0) | |
3350 | /* POP (LDMIA), including PC or LR. */ | |
3351 | found_return = 1; | |
3352 | } | |
3353 | ||
3354 | if (!found_return) | |
3355 | return 0; | |
3356 | ||
3357 | /* Scan backwards. This is just a heuristic, so do not worry about | |
3358 | false positives from mode changes. */ | |
3359 | ||
3360 | if (pc < func_start + 4) | |
3361 | return 0; | |
3362 | ||
3363 | insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); | |
f303bc3e | 3364 | if (arm_instruction_restores_sp (insn)) |
4024ca99 UW |
3365 | return 1; |
3366 | ||
3367 | return 0; | |
3368 | } | |
3369 | ||
c58b006a YQ |
3370 | /* Implement the stack_frame_destroyed_p gdbarch method. */ |
3371 | ||
3372 | static int | |
3373 | arm_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3374 | { | |
3375 | if (arm_pc_is_thumb (gdbarch, pc)) | |
3376 | return thumb_stack_frame_destroyed_p (gdbarch, pc); | |
3377 | else | |
3378 | return arm_stack_frame_destroyed_p_1 (gdbarch, pc); | |
3379 | } | |
4024ca99 | 3380 | |
2dd604e7 RE |
3381 | /* When arguments must be pushed onto the stack, they go on in reverse |
3382 | order. The code below implements a FILO (stack) to do this. */ | |
3383 | ||
3384 | struct stack_item | |
3385 | { | |
3386 | int len; | |
3387 | struct stack_item *prev; | |
7c543f7b | 3388 | gdb_byte *data; |
2dd604e7 RE |
3389 | }; |
3390 | ||
3391 | static struct stack_item * | |
df3b6708 | 3392 | push_stack_item (struct stack_item *prev, const gdb_byte *contents, int len) |
2dd604e7 RE |
3393 | { |
3394 | struct stack_item *si; | |
8d749320 | 3395 | si = XNEW (struct stack_item); |
7c543f7b | 3396 | si->data = (gdb_byte *) xmalloc (len); |
2dd604e7 RE |
3397 | si->len = len; |
3398 | si->prev = prev; | |
3399 | memcpy (si->data, contents, len); | |
3400 | return si; | |
3401 | } | |
3402 | ||
3403 | static struct stack_item * | |
3404 | pop_stack_item (struct stack_item *si) | |
3405 | { | |
3406 | struct stack_item *dead = si; | |
3407 | si = si->prev; | |
3408 | xfree (dead->data); | |
3409 | xfree (dead); | |
3410 | return si; | |
3411 | } | |
3412 | ||
030197b4 AB |
3413 | /* Implement the gdbarch type alignment method, overrides the generic |
3414 | alignment algorithm for anything that is arm specific. */ | |
2af48f68 | 3415 | |
030197b4 AB |
3416 | static ULONGEST |
3417 | arm_type_align (gdbarch *gdbarch, struct type *t) | |
2af48f68 | 3418 | { |
2af48f68 | 3419 | t = check_typedef (t); |
bd63c870 | 3420 | if (t->code () == TYPE_CODE_ARRAY && t->is_vector ()) |
2af48f68 | 3421 | { |
030197b4 AB |
3422 | /* Use the natural alignment for vector types (the same for |
3423 | scalar type), but the maximum alignment is 64-bit. */ | |
3424 | if (TYPE_LENGTH (t) > 8) | |
3425 | return 8; | |
c4312b19 | 3426 | else |
030197b4 | 3427 | return TYPE_LENGTH (t); |
2af48f68 | 3428 | } |
030197b4 AB |
3429 | |
3430 | /* Allow the common code to calculate the alignment. */ | |
3431 | return 0; | |
2af48f68 PB |
3432 | } |
3433 | ||
90445bd3 DJ |
3434 | /* Possible base types for a candidate for passing and returning in |
3435 | VFP registers. */ | |
3436 | ||
3437 | enum arm_vfp_cprc_base_type | |
3438 | { | |
3439 | VFP_CPRC_UNKNOWN, | |
3440 | VFP_CPRC_SINGLE, | |
3441 | VFP_CPRC_DOUBLE, | |
3442 | VFP_CPRC_VEC64, | |
3443 | VFP_CPRC_VEC128 | |
3444 | }; | |
3445 | ||
3446 | /* The length of one element of base type B. */ | |
3447 | ||
3448 | static unsigned | |
3449 | arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b) | |
3450 | { | |
3451 | switch (b) | |
3452 | { | |
3453 | case VFP_CPRC_SINGLE: | |
3454 | return 4; | |
3455 | case VFP_CPRC_DOUBLE: | |
3456 | return 8; | |
3457 | case VFP_CPRC_VEC64: | |
3458 | return 8; | |
3459 | case VFP_CPRC_VEC128: | |
3460 | return 16; | |
3461 | default: | |
3462 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3463 | (int) b); | |
3464 | } | |
3465 | } | |
3466 | ||
3467 | /* The character ('s', 'd' or 'q') for the type of VFP register used | |
3468 | for passing base type B. */ | |
3469 | ||
3470 | static int | |
3471 | arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b) | |
3472 | { | |
3473 | switch (b) | |
3474 | { | |
3475 | case VFP_CPRC_SINGLE: | |
3476 | return 's'; | |
3477 | case VFP_CPRC_DOUBLE: | |
3478 | return 'd'; | |
3479 | case VFP_CPRC_VEC64: | |
3480 | return 'd'; | |
3481 | case VFP_CPRC_VEC128: | |
3482 | return 'q'; | |
3483 | default: | |
3484 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3485 | (int) b); | |
3486 | } | |
3487 | } | |
3488 | ||
3489 | /* Determine whether T may be part of a candidate for passing and | |
3490 | returning in VFP registers, ignoring the limit on the total number | |
3491 | of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the | |
3492 | classification of the first valid component found; if it is not | |
3493 | VFP_CPRC_UNKNOWN, all components must have the same classification | |
3494 | as *BASE_TYPE. If it is found that T contains a type not permitted | |
3495 | for passing and returning in VFP registers, a type differently | |
3496 | classified from *BASE_TYPE, or two types differently classified | |
3497 | from each other, return -1, otherwise return the total number of | |
3498 | base-type elements found (possibly 0 in an empty structure or | |
817e0957 YQ |
3499 | array). Vector types are not currently supported, matching the |
3500 | generic AAPCS support. */ | |
90445bd3 DJ |
3501 | |
3502 | static int | |
3503 | arm_vfp_cprc_sub_candidate (struct type *t, | |
3504 | enum arm_vfp_cprc_base_type *base_type) | |
3505 | { | |
3506 | t = check_typedef (t); | |
78134374 | 3507 | switch (t->code ()) |
90445bd3 DJ |
3508 | { |
3509 | case TYPE_CODE_FLT: | |
3510 | switch (TYPE_LENGTH (t)) | |
3511 | { | |
3512 | case 4: | |
3513 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3514 | *base_type = VFP_CPRC_SINGLE; | |
3515 | else if (*base_type != VFP_CPRC_SINGLE) | |
3516 | return -1; | |
3517 | return 1; | |
3518 | ||
3519 | case 8: | |
3520 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3521 | *base_type = VFP_CPRC_DOUBLE; | |
3522 | else if (*base_type != VFP_CPRC_DOUBLE) | |
3523 | return -1; | |
3524 | return 1; | |
3525 | ||
3526 | default: | |
3527 | return -1; | |
3528 | } | |
3529 | break; | |
3530 | ||
817e0957 YQ |
3531 | case TYPE_CODE_COMPLEX: |
3532 | /* Arguments of complex T where T is one of the types float or | |
3533 | double get treated as if they are implemented as: | |
3534 | ||
3535 | struct complexT | |
3536 | { | |
3537 | T real; | |
3538 | T imag; | |
5f52445b YQ |
3539 | }; |
3540 | ||
3541 | */ | |
817e0957 YQ |
3542 | switch (TYPE_LENGTH (t)) |
3543 | { | |
3544 | case 8: | |
3545 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3546 | *base_type = VFP_CPRC_SINGLE; | |
3547 | else if (*base_type != VFP_CPRC_SINGLE) | |
3548 | return -1; | |
3549 | return 2; | |
3550 | ||
3551 | case 16: | |
3552 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3553 | *base_type = VFP_CPRC_DOUBLE; | |
3554 | else if (*base_type != VFP_CPRC_DOUBLE) | |
3555 | return -1; | |
3556 | return 2; | |
3557 | ||
3558 | default: | |
3559 | return -1; | |
3560 | } | |
3561 | break; | |
3562 | ||
90445bd3 DJ |
3563 | case TYPE_CODE_ARRAY: |
3564 | { | |
bd63c870 | 3565 | if (t->is_vector ()) |
90445bd3 | 3566 | { |
c4312b19 YQ |
3567 | /* A 64-bit or 128-bit containerized vector type are VFP |
3568 | CPRCs. */ | |
3569 | switch (TYPE_LENGTH (t)) | |
3570 | { | |
3571 | case 8: | |
3572 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3573 | *base_type = VFP_CPRC_VEC64; | |
3574 | return 1; | |
3575 | case 16: | |
3576 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3577 | *base_type = VFP_CPRC_VEC128; | |
3578 | return 1; | |
3579 | default: | |
3580 | return -1; | |
3581 | } | |
3582 | } | |
3583 | else | |
3584 | { | |
3585 | int count; | |
3586 | unsigned unitlen; | |
3587 | ||
3588 | count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), | |
3589 | base_type); | |
3590 | if (count == -1) | |
3591 | return -1; | |
3592 | if (TYPE_LENGTH (t) == 0) | |
3593 | { | |
3594 | gdb_assert (count == 0); | |
3595 | return 0; | |
3596 | } | |
3597 | else if (count == 0) | |
3598 | return -1; | |
3599 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3600 | gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0); | |
3601 | return TYPE_LENGTH (t) / unitlen; | |
90445bd3 | 3602 | } |
90445bd3 DJ |
3603 | } |
3604 | break; | |
3605 | ||
3606 | case TYPE_CODE_STRUCT: | |
3607 | { | |
3608 | int count = 0; | |
3609 | unsigned unitlen; | |
3610 | int i; | |
1f704f76 | 3611 | for (i = 0; i < t->num_fields (); i++) |
90445bd3 | 3612 | { |
1040b979 YQ |
3613 | int sub_count = 0; |
3614 | ||
ceacbf6e | 3615 | if (!field_is_static (&t->field (i))) |
940da03e | 3616 | sub_count = arm_vfp_cprc_sub_candidate (t->field (i).type (), |
1040b979 | 3617 | base_type); |
90445bd3 DJ |
3618 | if (sub_count == -1) |
3619 | return -1; | |
3620 | count += sub_count; | |
3621 | } | |
3622 | if (TYPE_LENGTH (t) == 0) | |
3623 | { | |
3624 | gdb_assert (count == 0); | |
3625 | return 0; | |
3626 | } | |
3627 | else if (count == 0) | |
3628 | return -1; | |
3629 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3630 | if (TYPE_LENGTH (t) != unitlen * count) | |
3631 | return -1; | |
3632 | return count; | |
3633 | } | |
3634 | ||
3635 | case TYPE_CODE_UNION: | |
3636 | { | |
3637 | int count = 0; | |
3638 | unsigned unitlen; | |
3639 | int i; | |
1f704f76 | 3640 | for (i = 0; i < t->num_fields (); i++) |
90445bd3 | 3641 | { |
940da03e | 3642 | int sub_count = arm_vfp_cprc_sub_candidate (t->field (i).type (), |
90445bd3 DJ |
3643 | base_type); |
3644 | if (sub_count == -1) | |
3645 | return -1; | |
3646 | count = (count > sub_count ? count : sub_count); | |
3647 | } | |
3648 | if (TYPE_LENGTH (t) == 0) | |
3649 | { | |
3650 | gdb_assert (count == 0); | |
3651 | return 0; | |
3652 | } | |
3653 | else if (count == 0) | |
3654 | return -1; | |
3655 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3656 | if (TYPE_LENGTH (t) != unitlen * count) | |
3657 | return -1; | |
3658 | return count; | |
3659 | } | |
3660 | ||
3661 | default: | |
3662 | break; | |
3663 | } | |
3664 | ||
3665 | return -1; | |
3666 | } | |
3667 | ||
3668 | /* Determine whether T is a VFP co-processor register candidate (CPRC) | |
3669 | if passed to or returned from a non-variadic function with the VFP | |
3670 | ABI in effect. Return 1 if it is, 0 otherwise. If it is, set | |
3671 | *BASE_TYPE to the base type for T and *COUNT to the number of | |
3672 | elements of that base type before returning. */ | |
3673 | ||
3674 | static int | |
3675 | arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type, | |
3676 | int *count) | |
3677 | { | |
3678 | enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN; | |
3679 | int c = arm_vfp_cprc_sub_candidate (t, &b); | |
3680 | if (c <= 0 || c > 4) | |
3681 | return 0; | |
3682 | *base_type = b; | |
3683 | *count = c; | |
3684 | return 1; | |
3685 | } | |
3686 | ||
3687 | /* Return 1 if the VFP ABI should be used for passing arguments to and | |
3688 | returning values from a function of type FUNC_TYPE, 0 | |
3689 | otherwise. */ | |
3690 | ||
3691 | static int | |
3692 | arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type) | |
3693 | { | |
3694 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3695 | /* Variadic functions always use the base ABI. Assume that functions | |
3696 | without debug info are not variadic. */ | |
a409645d | 3697 | if (func_type && check_typedef (func_type)->has_varargs ()) |
90445bd3 DJ |
3698 | return 0; |
3699 | /* The VFP ABI is only supported as a variant of AAPCS. */ | |
3700 | if (tdep->arm_abi != ARM_ABI_AAPCS) | |
3701 | return 0; | |
3702 | return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP; | |
3703 | } | |
3704 | ||
3705 | /* We currently only support passing parameters in integer registers, which | |
3706 | conforms with GCC's default model, and VFP argument passing following | |
3707 | the VFP variant of AAPCS. Several other variants exist and | |
2dd604e7 RE |
3708 | we should probably support some of them based on the selected ABI. */ |
3709 | ||
3710 | static CORE_ADDR | |
7d9b040b | 3711 | arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
6a65450a | 3712 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
cf84fa6b AH |
3713 | struct value **args, CORE_ADDR sp, |
3714 | function_call_return_method return_method, | |
6a65450a | 3715 | CORE_ADDR struct_addr) |
2dd604e7 | 3716 | { |
e17a4113 | 3717 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
2dd604e7 RE |
3718 | int argnum; |
3719 | int argreg; | |
3720 | int nstack; | |
3721 | struct stack_item *si = NULL; | |
90445bd3 DJ |
3722 | int use_vfp_abi; |
3723 | struct type *ftype; | |
3724 | unsigned vfp_regs_free = (1 << 16) - 1; | |
3725 | ||
3726 | /* Determine the type of this function and whether the VFP ABI | |
3727 | applies. */ | |
3728 | ftype = check_typedef (value_type (function)); | |
78134374 | 3729 | if (ftype->code () == TYPE_CODE_PTR) |
90445bd3 DJ |
3730 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
3731 | use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype); | |
2dd604e7 | 3732 | |
6a65450a AC |
3733 | /* Set the return address. For the ARM, the return breakpoint is |
3734 | always at BP_ADDR. */ | |
9779414d | 3735 | if (arm_pc_is_thumb (gdbarch, bp_addr)) |
9dca5578 | 3736 | bp_addr |= 1; |
6a65450a | 3737 | regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr); |
2dd604e7 RE |
3738 | |
3739 | /* Walk through the list of args and determine how large a temporary | |
3740 | stack is required. Need to take care here as structs may be | |
7a9dd1b2 | 3741 | passed on the stack, and we have to push them. */ |
2dd604e7 RE |
3742 | nstack = 0; |
3743 | ||
3744 | argreg = ARM_A1_REGNUM; | |
3745 | nstack = 0; | |
3746 | ||
2dd604e7 RE |
3747 | /* The struct_return pointer occupies the first parameter |
3748 | passing register. */ | |
cf84fa6b | 3749 | if (return_method == return_method_struct) |
2dd604e7 RE |
3750 | { |
3751 | if (arm_debug) | |
5af949e3 | 3752 | fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n", |
2af46ca0 | 3753 | gdbarch_register_name (gdbarch, argreg), |
5af949e3 | 3754 | paddress (gdbarch, struct_addr)); |
2dd604e7 RE |
3755 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
3756 | argreg++; | |
3757 | } | |
3758 | ||
3759 | for (argnum = 0; argnum < nargs; argnum++) | |
3760 | { | |
3761 | int len; | |
3762 | struct type *arg_type; | |
3763 | struct type *target_type; | |
3764 | enum type_code typecode; | |
8c6363cf | 3765 | const bfd_byte *val; |
2af48f68 | 3766 | int align; |
90445bd3 DJ |
3767 | enum arm_vfp_cprc_base_type vfp_base_type; |
3768 | int vfp_base_count; | |
3769 | int may_use_core_reg = 1; | |
2dd604e7 | 3770 | |
df407dfe | 3771 | arg_type = check_typedef (value_type (args[argnum])); |
2dd604e7 RE |
3772 | len = TYPE_LENGTH (arg_type); |
3773 | target_type = TYPE_TARGET_TYPE (arg_type); | |
78134374 | 3774 | typecode = arg_type->code (); |
8c6363cf | 3775 | val = value_contents (args[argnum]); |
2dd604e7 | 3776 | |
030197b4 | 3777 | align = type_align (arg_type); |
2af48f68 | 3778 | /* Round alignment up to a whole number of words. */ |
f0452268 AH |
3779 | align = (align + ARM_INT_REGISTER_SIZE - 1) |
3780 | & ~(ARM_INT_REGISTER_SIZE - 1); | |
2af48f68 PB |
3781 | /* Different ABIs have different maximum alignments. */ |
3782 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS) | |
3783 | { | |
3784 | /* The APCS ABI only requires word alignment. */ | |
f0452268 | 3785 | align = ARM_INT_REGISTER_SIZE; |
2af48f68 PB |
3786 | } |
3787 | else | |
3788 | { | |
3789 | /* The AAPCS requires at most doubleword alignment. */ | |
f0452268 AH |
3790 | if (align > ARM_INT_REGISTER_SIZE * 2) |
3791 | align = ARM_INT_REGISTER_SIZE * 2; | |
2af48f68 PB |
3792 | } |
3793 | ||
90445bd3 DJ |
3794 | if (use_vfp_abi |
3795 | && arm_vfp_call_candidate (arg_type, &vfp_base_type, | |
3796 | &vfp_base_count)) | |
3797 | { | |
3798 | int regno; | |
3799 | int unit_length; | |
3800 | int shift; | |
3801 | unsigned mask; | |
3802 | ||
3803 | /* Because this is a CPRC it cannot go in a core register or | |
3804 | cause a core register to be skipped for alignment. | |
3805 | Either it goes in VFP registers and the rest of this loop | |
3806 | iteration is skipped for this argument, or it goes on the | |
3807 | stack (and the stack alignment code is correct for this | |
3808 | case). */ | |
3809 | may_use_core_reg = 0; | |
3810 | ||
3811 | unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
3812 | shift = unit_length / 4; | |
3813 | mask = (1 << (shift * vfp_base_count)) - 1; | |
3814 | for (regno = 0; regno < 16; regno += shift) | |
3815 | if (((vfp_regs_free >> regno) & mask) == mask) | |
3816 | break; | |
3817 | ||
3818 | if (regno < 16) | |
3819 | { | |
3820 | int reg_char; | |
3821 | int reg_scaled; | |
3822 | int i; | |
3823 | ||
3824 | vfp_regs_free &= ~(mask << regno); | |
3825 | reg_scaled = regno / shift; | |
3826 | reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
3827 | for (i = 0; i < vfp_base_count; i++) | |
3828 | { | |
3829 | char name_buf[4]; | |
3830 | int regnum; | |
58d6951d DJ |
3831 | if (reg_char == 'q') |
3832 | arm_neon_quad_write (gdbarch, regcache, reg_scaled + i, | |
90445bd3 | 3833 | val + i * unit_length); |
58d6951d DJ |
3834 | else |
3835 | { | |
8c042590 PM |
3836 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", |
3837 | reg_char, reg_scaled + i); | |
58d6951d DJ |
3838 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
3839 | strlen (name_buf)); | |
b66f5587 | 3840 | regcache->cooked_write (regnum, val + i * unit_length); |
58d6951d | 3841 | } |
90445bd3 DJ |
3842 | } |
3843 | continue; | |
3844 | } | |
3845 | else | |
3846 | { | |
3847 | /* This CPRC could not go in VFP registers, so all VFP | |
3848 | registers are now marked as used. */ | |
3849 | vfp_regs_free = 0; | |
3850 | } | |
3851 | } | |
3852 | ||
85102364 | 3853 | /* Push stack padding for doubleword alignment. */ |
2af48f68 PB |
3854 | if (nstack & (align - 1)) |
3855 | { | |
f0452268 AH |
3856 | si = push_stack_item (si, val, ARM_INT_REGISTER_SIZE); |
3857 | nstack += ARM_INT_REGISTER_SIZE; | |
2af48f68 PB |
3858 | } |
3859 | ||
3860 | /* Doubleword aligned quantities must go in even register pairs. */ | |
90445bd3 DJ |
3861 | if (may_use_core_reg |
3862 | && argreg <= ARM_LAST_ARG_REGNUM | |
f0452268 | 3863 | && align > ARM_INT_REGISTER_SIZE |
2af48f68 PB |
3864 | && argreg & 1) |
3865 | argreg++; | |
3866 | ||
2dd604e7 RE |
3867 | /* If the argument is a pointer to a function, and it is a |
3868 | Thumb function, create a LOCAL copy of the value and set | |
3869 | the THUMB bit in it. */ | |
3870 | if (TYPE_CODE_PTR == typecode | |
3871 | && target_type != NULL | |
78134374 | 3872 | && TYPE_CODE_FUNC == check_typedef (target_type)->code ()) |
2dd604e7 | 3873 | { |
e17a4113 | 3874 | CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order); |
9779414d | 3875 | if (arm_pc_is_thumb (gdbarch, regval)) |
2dd604e7 | 3876 | { |
224c3ddb | 3877 | bfd_byte *copy = (bfd_byte *) alloca (len); |
8c6363cf | 3878 | store_unsigned_integer (copy, len, byte_order, |
e17a4113 | 3879 | MAKE_THUMB_ADDR (regval)); |
8c6363cf | 3880 | val = copy; |
2dd604e7 RE |
3881 | } |
3882 | } | |
3883 | ||
3884 | /* Copy the argument to general registers or the stack in | |
3885 | register-sized pieces. Large arguments are split between | |
3886 | registers and stack. */ | |
3887 | while (len > 0) | |
3888 | { | |
f0452268 AH |
3889 | int partial_len = len < ARM_INT_REGISTER_SIZE |
3890 | ? len : ARM_INT_REGISTER_SIZE; | |
ef9bd0b8 YQ |
3891 | CORE_ADDR regval |
3892 | = extract_unsigned_integer (val, partial_len, byte_order); | |
2dd604e7 | 3893 | |
90445bd3 | 3894 | if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM) |
2dd604e7 RE |
3895 | { |
3896 | /* The argument is being passed in a general purpose | |
3897 | register. */ | |
e17a4113 | 3898 | if (byte_order == BFD_ENDIAN_BIG) |
f0452268 | 3899 | regval <<= (ARM_INT_REGISTER_SIZE - partial_len) * 8; |
2dd604e7 RE |
3900 | if (arm_debug) |
3901 | fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", | |
c9f4d572 UW |
3902 | argnum, |
3903 | gdbarch_register_name | |
2af46ca0 | 3904 | (gdbarch, argreg), |
f0452268 | 3905 | phex (regval, ARM_INT_REGISTER_SIZE)); |
2dd604e7 RE |
3906 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
3907 | argreg++; | |
3908 | } | |
3909 | else | |
3910 | { | |
f0452268 | 3911 | gdb_byte buf[ARM_INT_REGISTER_SIZE]; |
ef9bd0b8 YQ |
3912 | |
3913 | memset (buf, 0, sizeof (buf)); | |
3914 | store_unsigned_integer (buf, partial_len, byte_order, regval); | |
3915 | ||
2dd604e7 RE |
3916 | /* Push the arguments onto the stack. */ |
3917 | if (arm_debug) | |
3918 | fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n", | |
3919 | argnum, nstack); | |
f0452268 AH |
3920 | si = push_stack_item (si, buf, ARM_INT_REGISTER_SIZE); |
3921 | nstack += ARM_INT_REGISTER_SIZE; | |
2dd604e7 RE |
3922 | } |
3923 | ||
3924 | len -= partial_len; | |
3925 | val += partial_len; | |
3926 | } | |
3927 | } | |
3928 | /* If we have an odd number of words to push, then decrement the stack | |
3929 | by one word now, so first stack argument will be dword aligned. */ | |
3930 | if (nstack & 4) | |
3931 | sp -= 4; | |
3932 | ||
3933 | while (si) | |
3934 | { | |
3935 | sp -= si->len; | |
3936 | write_memory (sp, si->data, si->len); | |
3937 | si = pop_stack_item (si); | |
3938 | } | |
3939 | ||
3940 | /* Finally, update teh SP register. */ | |
3941 | regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp); | |
3942 | ||
3943 | return sp; | |
3944 | } | |
3945 | ||
f53f0d0b PB |
3946 | |
3947 | /* Always align the frame to an 8-byte boundary. This is required on | |
3948 | some platforms and harmless on the rest. */ | |
3949 | ||
3950 | static CORE_ADDR | |
3951 | arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
3952 | { | |
3953 | /* Align the stack to eight bytes. */ | |
3954 | return sp & ~ (CORE_ADDR) 7; | |
3955 | } | |
3956 | ||
c906108c | 3957 | static void |
12b27276 | 3958 | print_fpu_flags (struct ui_file *file, int flags) |
c906108c | 3959 | { |
c5aa993b | 3960 | if (flags & (1 << 0)) |
12b27276 | 3961 | fputs_filtered ("IVO ", file); |
c5aa993b | 3962 | if (flags & (1 << 1)) |
12b27276 | 3963 | fputs_filtered ("DVZ ", file); |
c5aa993b | 3964 | if (flags & (1 << 2)) |
12b27276 | 3965 | fputs_filtered ("OFL ", file); |
c5aa993b | 3966 | if (flags & (1 << 3)) |
12b27276 | 3967 | fputs_filtered ("UFL ", file); |
c5aa993b | 3968 | if (flags & (1 << 4)) |
12b27276 WN |
3969 | fputs_filtered ("INX ", file); |
3970 | fputc_filtered ('\n', file); | |
c906108c SS |
3971 | } |
3972 | ||
5e74b15c RE |
3973 | /* Print interesting information about the floating point processor |
3974 | (if present) or emulator. */ | |
34e8f22d | 3975 | static void |
d855c300 | 3976 | arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
23e3a7ac | 3977 | struct frame_info *frame, const char *args) |
c906108c | 3978 | { |
9c9acae0 | 3979 | unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM); |
c5aa993b JM |
3980 | int type; |
3981 | ||
3982 | type = (status >> 24) & 127; | |
edefbb7c | 3983 | if (status & (1 << 31)) |
12b27276 | 3984 | fprintf_filtered (file, _("Hardware FPU type %d\n"), type); |
edefbb7c | 3985 | else |
12b27276 | 3986 | fprintf_filtered (file, _("Software FPU type %d\n"), type); |
edefbb7c | 3987 | /* i18n: [floating point unit] mask */ |
12b27276 WN |
3988 | fputs_filtered (_("mask: "), file); |
3989 | print_fpu_flags (file, status >> 16); | |
edefbb7c | 3990 | /* i18n: [floating point unit] flags */ |
12b27276 WN |
3991 | fputs_filtered (_("flags: "), file); |
3992 | print_fpu_flags (file, status); | |
c906108c SS |
3993 | } |
3994 | ||
27067745 UW |
3995 | /* Construct the ARM extended floating point type. */ |
3996 | static struct type * | |
3997 | arm_ext_type (struct gdbarch *gdbarch) | |
3998 | { | |
3999 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4000 | ||
4001 | if (!tdep->arm_ext_type) | |
4002 | tdep->arm_ext_type | |
e9bb382b | 4003 | = arch_float_type (gdbarch, -1, "builtin_type_arm_ext", |
27067745 UW |
4004 | floatformats_arm_ext); |
4005 | ||
4006 | return tdep->arm_ext_type; | |
4007 | } | |
4008 | ||
58d6951d DJ |
4009 | static struct type * |
4010 | arm_neon_double_type (struct gdbarch *gdbarch) | |
4011 | { | |
4012 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4013 | ||
4014 | if (tdep->neon_double_type == NULL) | |
4015 | { | |
4016 | struct type *t, *elem; | |
4017 | ||
4018 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d", | |
4019 | TYPE_CODE_UNION); | |
4020 | elem = builtin_type (gdbarch)->builtin_uint8; | |
4021 | append_composite_type_field (t, "u8", init_vector_type (elem, 8)); | |
4022 | elem = builtin_type (gdbarch)->builtin_uint16; | |
4023 | append_composite_type_field (t, "u16", init_vector_type (elem, 4)); | |
4024 | elem = builtin_type (gdbarch)->builtin_uint32; | |
4025 | append_composite_type_field (t, "u32", init_vector_type (elem, 2)); | |
4026 | elem = builtin_type (gdbarch)->builtin_uint64; | |
4027 | append_composite_type_field (t, "u64", elem); | |
4028 | elem = builtin_type (gdbarch)->builtin_float; | |
4029 | append_composite_type_field (t, "f32", init_vector_type (elem, 2)); | |
4030 | elem = builtin_type (gdbarch)->builtin_double; | |
4031 | append_composite_type_field (t, "f64", elem); | |
4032 | ||
2062087b | 4033 | t->set_is_vector (true); |
d0e39ea2 | 4034 | t->set_name ("neon_d"); |
58d6951d DJ |
4035 | tdep->neon_double_type = t; |
4036 | } | |
4037 | ||
4038 | return tdep->neon_double_type; | |
4039 | } | |
4040 | ||
4041 | /* FIXME: The vector types are not correctly ordered on big-endian | |
4042 | targets. Just as s0 is the low bits of d0, d0[0] is also the low | |
4043 | bits of d0 - regardless of what unit size is being held in d0. So | |
4044 | the offset of the first uint8 in d0 is 7, but the offset of the | |
4045 | first float is 4. This code works as-is for little-endian | |
4046 | targets. */ | |
4047 | ||
4048 | static struct type * | |
4049 | arm_neon_quad_type (struct gdbarch *gdbarch) | |
4050 | { | |
4051 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4052 | ||
4053 | if (tdep->neon_quad_type == NULL) | |
4054 | { | |
4055 | struct type *t, *elem; | |
4056 | ||
4057 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q", | |
4058 | TYPE_CODE_UNION); | |
4059 | elem = builtin_type (gdbarch)->builtin_uint8; | |
4060 | append_composite_type_field (t, "u8", init_vector_type (elem, 16)); | |
4061 | elem = builtin_type (gdbarch)->builtin_uint16; | |
4062 | append_composite_type_field (t, "u16", init_vector_type (elem, 8)); | |
4063 | elem = builtin_type (gdbarch)->builtin_uint32; | |
4064 | append_composite_type_field (t, "u32", init_vector_type (elem, 4)); | |
4065 | elem = builtin_type (gdbarch)->builtin_uint64; | |
4066 | append_composite_type_field (t, "u64", init_vector_type (elem, 2)); | |
4067 | elem = builtin_type (gdbarch)->builtin_float; | |
4068 | append_composite_type_field (t, "f32", init_vector_type (elem, 4)); | |
4069 | elem = builtin_type (gdbarch)->builtin_double; | |
4070 | append_composite_type_field (t, "f64", init_vector_type (elem, 2)); | |
4071 | ||
2062087b | 4072 | t->set_is_vector (true); |
d0e39ea2 | 4073 | t->set_name ("neon_q"); |
58d6951d DJ |
4074 | tdep->neon_quad_type = t; |
4075 | } | |
4076 | ||
4077 | return tdep->neon_quad_type; | |
4078 | } | |
4079 | ||
34e8f22d RE |
4080 | /* Return the GDB type object for the "standard" data type of data in |
4081 | register N. */ | |
4082 | ||
4083 | static struct type * | |
7a5ea0d4 | 4084 | arm_register_type (struct gdbarch *gdbarch, int regnum) |
032758dc | 4085 | { |
58d6951d DJ |
4086 | int num_regs = gdbarch_num_regs (gdbarch); |
4087 | ||
4088 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
4089 | && regnum >= num_regs && regnum < num_regs + 32) | |
4090 | return builtin_type (gdbarch)->builtin_float; | |
4091 | ||
4092 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
4093 | && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16) | |
4094 | return arm_neon_quad_type (gdbarch); | |
4095 | ||
4096 | /* If the target description has register information, we are only | |
4097 | in this function so that we can override the types of | |
4098 | double-precision registers for NEON. */ | |
4099 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
4100 | { | |
4101 | struct type *t = tdesc_register_type (gdbarch, regnum); | |
4102 | ||
4103 | if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32 | |
78134374 | 4104 | && t->code () == TYPE_CODE_FLT |
58d6951d DJ |
4105 | && gdbarch_tdep (gdbarch)->have_neon) |
4106 | return arm_neon_double_type (gdbarch); | |
4107 | else | |
4108 | return t; | |
4109 | } | |
4110 | ||
34e8f22d | 4111 | if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS) |
58d6951d DJ |
4112 | { |
4113 | if (!gdbarch_tdep (gdbarch)->have_fpa_registers) | |
4114 | return builtin_type (gdbarch)->builtin_void; | |
4115 | ||
4116 | return arm_ext_type (gdbarch); | |
4117 | } | |
e4c16157 | 4118 | else if (regnum == ARM_SP_REGNUM) |
0dfff4cb | 4119 | return builtin_type (gdbarch)->builtin_data_ptr; |
e4c16157 | 4120 | else if (regnum == ARM_PC_REGNUM) |
0dfff4cb | 4121 | return builtin_type (gdbarch)->builtin_func_ptr; |
ff6f572f DJ |
4122 | else if (regnum >= ARRAY_SIZE (arm_register_names)) |
4123 | /* These registers are only supported on targets which supply | |
4124 | an XML description. */ | |
df4df182 | 4125 | return builtin_type (gdbarch)->builtin_int0; |
032758dc | 4126 | else |
df4df182 | 4127 | return builtin_type (gdbarch)->builtin_uint32; |
032758dc AC |
4128 | } |
4129 | ||
ff6f572f DJ |
4130 | /* Map a DWARF register REGNUM onto the appropriate GDB register |
4131 | number. */ | |
4132 | ||
4133 | static int | |
d3f73121 | 4134 | arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
ff6f572f DJ |
4135 | { |
4136 | /* Core integer regs. */ | |
4137 | if (reg >= 0 && reg <= 15) | |
4138 | return reg; | |
4139 | ||
4140 | /* Legacy FPA encoding. These were once used in a way which | |
4141 | overlapped with VFP register numbering, so their use is | |
4142 | discouraged, but GDB doesn't support the ARM toolchain | |
4143 | which used them for VFP. */ | |
4144 | if (reg >= 16 && reg <= 23) | |
4145 | return ARM_F0_REGNUM + reg - 16; | |
4146 | ||
4147 | /* New assignments for the FPA registers. */ | |
4148 | if (reg >= 96 && reg <= 103) | |
4149 | return ARM_F0_REGNUM + reg - 96; | |
4150 | ||
4151 | /* WMMX register assignments. */ | |
4152 | if (reg >= 104 && reg <= 111) | |
4153 | return ARM_WCGR0_REGNUM + reg - 104; | |
4154 | ||
4155 | if (reg >= 112 && reg <= 127) | |
4156 | return ARM_WR0_REGNUM + reg - 112; | |
4157 | ||
4158 | if (reg >= 192 && reg <= 199) | |
4159 | return ARM_WC0_REGNUM + reg - 192; | |
4160 | ||
58d6951d DJ |
4161 | /* VFP v2 registers. A double precision value is actually |
4162 | in d1 rather than s2, but the ABI only defines numbering | |
4163 | for the single precision registers. This will "just work" | |
4164 | in GDB for little endian targets (we'll read eight bytes, | |
4165 | starting in s0 and then progressing to s1), but will be | |
4166 | reversed on big endian targets with VFP. This won't | |
4167 | be a problem for the new Neon quad registers; you're supposed | |
4168 | to use DW_OP_piece for those. */ | |
4169 | if (reg >= 64 && reg <= 95) | |
4170 | { | |
4171 | char name_buf[4]; | |
4172 | ||
8c042590 | 4173 | xsnprintf (name_buf, sizeof (name_buf), "s%d", reg - 64); |
58d6951d DJ |
4174 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4175 | strlen (name_buf)); | |
4176 | } | |
4177 | ||
4178 | /* VFP v3 / Neon registers. This range is also used for VFP v2 | |
4179 | registers, except that it now describes d0 instead of s0. */ | |
4180 | if (reg >= 256 && reg <= 287) | |
4181 | { | |
4182 | char name_buf[4]; | |
4183 | ||
8c042590 | 4184 | xsnprintf (name_buf, sizeof (name_buf), "d%d", reg - 256); |
58d6951d DJ |
4185 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4186 | strlen (name_buf)); | |
4187 | } | |
4188 | ||
ff6f572f DJ |
4189 | return -1; |
4190 | } | |
4191 | ||
26216b98 AC |
4192 | /* Map GDB internal REGNUM onto the Arm simulator register numbers. */ |
4193 | static int | |
e7faf938 | 4194 | arm_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
26216b98 AC |
4195 | { |
4196 | int reg = regnum; | |
e7faf938 | 4197 | gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch)); |
26216b98 | 4198 | |
ff6f572f DJ |
4199 | if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM) |
4200 | return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM; | |
4201 | ||
4202 | if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM) | |
4203 | return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM; | |
4204 | ||
4205 | if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM) | |
4206 | return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM; | |
4207 | ||
26216b98 AC |
4208 | if (reg < NUM_GREGS) |
4209 | return SIM_ARM_R0_REGNUM + reg; | |
4210 | reg -= NUM_GREGS; | |
4211 | ||
4212 | if (reg < NUM_FREGS) | |
4213 | return SIM_ARM_FP0_REGNUM + reg; | |
4214 | reg -= NUM_FREGS; | |
4215 | ||
4216 | if (reg < NUM_SREGS) | |
4217 | return SIM_ARM_FPS_REGNUM + reg; | |
4218 | reg -= NUM_SREGS; | |
4219 | ||
edefbb7c | 4220 | internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum); |
26216b98 | 4221 | } |
34e8f22d | 4222 | |
d9311bfa AT |
4223 | /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand |
4224 | the buffer to be NEW_LEN bytes ending at ENDADDR. Return | |
4225 | NULL if an error occurs. BUF is freed. */ | |
c906108c | 4226 | |
d9311bfa AT |
4227 | static gdb_byte * |
4228 | extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr, | |
4229 | int old_len, int new_len) | |
4230 | { | |
4231 | gdb_byte *new_buf; | |
4232 | int bytes_to_read = new_len - old_len; | |
c906108c | 4233 | |
d9311bfa AT |
4234 | new_buf = (gdb_byte *) xmalloc (new_len); |
4235 | memcpy (new_buf + bytes_to_read, buf, old_len); | |
4236 | xfree (buf); | |
198cd59d | 4237 | if (target_read_code (endaddr - new_len, new_buf, bytes_to_read) != 0) |
d9311bfa AT |
4238 | { |
4239 | xfree (new_buf); | |
4240 | return NULL; | |
c906108c | 4241 | } |
d9311bfa | 4242 | return new_buf; |
c906108c SS |
4243 | } |
4244 | ||
d9311bfa AT |
4245 | /* An IT block is at most the 2-byte IT instruction followed by |
4246 | four 4-byte instructions. The furthest back we must search to | |
4247 | find an IT block that affects the current instruction is thus | |
4248 | 2 + 3 * 4 == 14 bytes. */ | |
4249 | #define MAX_IT_BLOCK_PREFIX 14 | |
177321bd | 4250 | |
d9311bfa AT |
4251 | /* Use a quick scan if there are more than this many bytes of |
4252 | code. */ | |
4253 | #define IT_SCAN_THRESHOLD 32 | |
177321bd | 4254 | |
d9311bfa AT |
4255 | /* Adjust a breakpoint's address to move breakpoints out of IT blocks. |
4256 | A breakpoint in an IT block may not be hit, depending on the | |
4257 | condition flags. */ | |
ad527d2e | 4258 | static CORE_ADDR |
d9311bfa | 4259 | arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr) |
c906108c | 4260 | { |
d9311bfa AT |
4261 | gdb_byte *buf; |
4262 | char map_type; | |
4263 | CORE_ADDR boundary, func_start; | |
4264 | int buf_len; | |
4265 | enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch); | |
4266 | int i, any, last_it, last_it_count; | |
177321bd | 4267 | |
d9311bfa AT |
4268 | /* If we are using BKPT breakpoints, none of this is necessary. */ |
4269 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL) | |
4270 | return bpaddr; | |
177321bd | 4271 | |
d9311bfa AT |
4272 | /* ARM mode does not have this problem. */ |
4273 | if (!arm_pc_is_thumb (gdbarch, bpaddr)) | |
4274 | return bpaddr; | |
177321bd | 4275 | |
d9311bfa AT |
4276 | /* We are setting a breakpoint in Thumb code that could potentially |
4277 | contain an IT block. The first step is to find how much Thumb | |
4278 | code there is; we do not need to read outside of known Thumb | |
4279 | sequences. */ | |
4280 | map_type = arm_find_mapping_symbol (bpaddr, &boundary); | |
4281 | if (map_type == 0) | |
4282 | /* Thumb-2 code must have mapping symbols to have a chance. */ | |
4283 | return bpaddr; | |
9dca5578 | 4284 | |
d9311bfa | 4285 | bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr); |
177321bd | 4286 | |
d9311bfa AT |
4287 | if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL) |
4288 | && func_start > boundary) | |
4289 | boundary = func_start; | |
9dca5578 | 4290 | |
d9311bfa AT |
4291 | /* Search for a candidate IT instruction. We have to do some fancy |
4292 | footwork to distinguish a real IT instruction from the second | |
4293 | half of a 32-bit instruction, but there is no need for that if | |
4294 | there's no candidate. */ | |
325fac50 | 4295 | buf_len = std::min (bpaddr - boundary, (CORE_ADDR) MAX_IT_BLOCK_PREFIX); |
d9311bfa AT |
4296 | if (buf_len == 0) |
4297 | /* No room for an IT instruction. */ | |
4298 | return bpaddr; | |
c906108c | 4299 | |
d9311bfa | 4300 | buf = (gdb_byte *) xmalloc (buf_len); |
198cd59d | 4301 | if (target_read_code (bpaddr - buf_len, buf, buf_len) != 0) |
d9311bfa AT |
4302 | return bpaddr; |
4303 | any = 0; | |
4304 | for (i = 0; i < buf_len; i += 2) | |
c906108c | 4305 | { |
d9311bfa AT |
4306 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); |
4307 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
25b41d01 | 4308 | { |
d9311bfa AT |
4309 | any = 1; |
4310 | break; | |
25b41d01 | 4311 | } |
c906108c | 4312 | } |
d9311bfa AT |
4313 | |
4314 | if (any == 0) | |
c906108c | 4315 | { |
d9311bfa AT |
4316 | xfree (buf); |
4317 | return bpaddr; | |
f9d67f43 DJ |
4318 | } |
4319 | ||
4320 | /* OK, the code bytes before this instruction contain at least one | |
4321 | halfword which resembles an IT instruction. We know that it's | |
4322 | Thumb code, but there are still two possibilities. Either the | |
4323 | halfword really is an IT instruction, or it is the second half of | |
4324 | a 32-bit Thumb instruction. The only way we can tell is to | |
4325 | scan forwards from a known instruction boundary. */ | |
4326 | if (bpaddr - boundary > IT_SCAN_THRESHOLD) | |
4327 | { | |
4328 | int definite; | |
4329 | ||
4330 | /* There's a lot of code before this instruction. Start with an | |
4331 | optimistic search; it's easy to recognize halfwords that can | |
4332 | not be the start of a 32-bit instruction, and use that to | |
4333 | lock on to the instruction boundaries. */ | |
4334 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD); | |
4335 | if (buf == NULL) | |
4336 | return bpaddr; | |
4337 | buf_len = IT_SCAN_THRESHOLD; | |
4338 | ||
4339 | definite = 0; | |
4340 | for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2) | |
4341 | { | |
4342 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
4343 | if (thumb_insn_size (inst1) == 2) | |
4344 | { | |
4345 | definite = 1; | |
4346 | break; | |
4347 | } | |
4348 | } | |
4349 | ||
4350 | /* At this point, if DEFINITE, BUF[I] is the first place we | |
4351 | are sure that we know the instruction boundaries, and it is far | |
4352 | enough from BPADDR that we could not miss an IT instruction | |
4353 | affecting BPADDR. If ! DEFINITE, give up - start from a | |
4354 | known boundary. */ | |
4355 | if (! definite) | |
4356 | { | |
0963b4bd MS |
4357 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, |
4358 | bpaddr - boundary); | |
f9d67f43 DJ |
4359 | if (buf == NULL) |
4360 | return bpaddr; | |
4361 | buf_len = bpaddr - boundary; | |
4362 | i = 0; | |
4363 | } | |
4364 | } | |
4365 | else | |
4366 | { | |
4367 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary); | |
4368 | if (buf == NULL) | |
4369 | return bpaddr; | |
4370 | buf_len = bpaddr - boundary; | |
4371 | i = 0; | |
4372 | } | |
4373 | ||
4374 | /* Scan forwards. Find the last IT instruction before BPADDR. */ | |
4375 | last_it = -1; | |
4376 | last_it_count = 0; | |
4377 | while (i < buf_len) | |
4378 | { | |
4379 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
4380 | last_it_count--; | |
4381 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
4382 | { | |
4383 | last_it = i; | |
4384 | if (inst1 & 0x0001) | |
4385 | last_it_count = 4; | |
4386 | else if (inst1 & 0x0002) | |
4387 | last_it_count = 3; | |
4388 | else if (inst1 & 0x0004) | |
4389 | last_it_count = 2; | |
4390 | else | |
4391 | last_it_count = 1; | |
4392 | } | |
4393 | i += thumb_insn_size (inst1); | |
4394 | } | |
4395 | ||
4396 | xfree (buf); | |
4397 | ||
4398 | if (last_it == -1) | |
4399 | /* There wasn't really an IT instruction after all. */ | |
4400 | return bpaddr; | |
4401 | ||
4402 | if (last_it_count < 1) | |
4403 | /* It was too far away. */ | |
4404 | return bpaddr; | |
4405 | ||
4406 | /* This really is a trouble spot. Move the breakpoint to the IT | |
4407 | instruction. */ | |
4408 | return bpaddr - buf_len + last_it; | |
4409 | } | |
4410 | ||
cca44b1b | 4411 | /* ARM displaced stepping support. |
c906108c | 4412 | |
cca44b1b | 4413 | Generally ARM displaced stepping works as follows: |
c906108c | 4414 | |
cca44b1b | 4415 | 1. When an instruction is to be single-stepped, it is first decoded by |
2ba163c8 SM |
4416 | arm_process_displaced_insn. Depending on the type of instruction, it is |
4417 | then copied to a scratch location, possibly in a modified form. The | |
4418 | copy_* set of functions performs such modification, as necessary. A | |
4419 | breakpoint is placed after the modified instruction in the scratch space | |
4420 | to return control to GDB. Note in particular that instructions which | |
4421 | modify the PC will no longer do so after modification. | |
c5aa993b | 4422 | |
cca44b1b JB |
4423 | 2. The instruction is single-stepped, by setting the PC to the scratch |
4424 | location address, and resuming. Control returns to GDB when the | |
4425 | breakpoint is hit. | |
c5aa993b | 4426 | |
cca44b1b JB |
4427 | 3. A cleanup function (cleanup_*) is called corresponding to the copy_* |
4428 | function used for the current instruction. This function's job is to | |
4429 | put the CPU/memory state back to what it would have been if the | |
4430 | instruction had been executed unmodified in its original location. */ | |
c5aa993b | 4431 | |
cca44b1b JB |
4432 | /* NOP instruction (mov r0, r0). */ |
4433 | #define ARM_NOP 0xe1a00000 | |
34518530 | 4434 | #define THUMB_NOP 0x4600 |
cca44b1b JB |
4435 | |
4436 | /* Helper for register reads for displaced stepping. In particular, this | |
4437 | returns the PC as it would be seen by the instruction at its original | |
4438 | location. */ | |
4439 | ||
4440 | ULONGEST | |
cfba9872 | 4441 | displaced_read_reg (struct regcache *regs, arm_displaced_step_closure *dsc, |
36073a92 | 4442 | int regno) |
cca44b1b JB |
4443 | { |
4444 | ULONGEST ret; | |
36073a92 | 4445 | CORE_ADDR from = dsc->insn_addr; |
cca44b1b | 4446 | |
bf9f652a | 4447 | if (regno == ARM_PC_REGNUM) |
cca44b1b | 4448 | { |
4db71c0b YQ |
4449 | /* Compute pipeline offset: |
4450 | - When executing an ARM instruction, PC reads as the address of the | |
4451 | current instruction plus 8. | |
4452 | - When executing a Thumb instruction, PC reads as the address of the | |
4453 | current instruction plus 4. */ | |
4454 | ||
36073a92 | 4455 | if (!dsc->is_thumb) |
4db71c0b YQ |
4456 | from += 8; |
4457 | else | |
4458 | from += 4; | |
4459 | ||
cca44b1b JB |
4460 | if (debug_displaced) |
4461 | fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n", | |
4db71c0b YQ |
4462 | (unsigned long) from); |
4463 | return (ULONGEST) from; | |
cca44b1b | 4464 | } |
c906108c | 4465 | else |
cca44b1b JB |
4466 | { |
4467 | regcache_cooked_read_unsigned (regs, regno, &ret); | |
4468 | if (debug_displaced) | |
4469 | fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n", | |
4470 | regno, (unsigned long) ret); | |
4471 | return ret; | |
4472 | } | |
c906108c SS |
4473 | } |
4474 | ||
cca44b1b JB |
4475 | static int |
4476 | displaced_in_arm_mode (struct regcache *regs) | |
4477 | { | |
4478 | ULONGEST ps; | |
ac7936df | 4479 | ULONGEST t_bit = arm_psr_thumb_bit (regs->arch ()); |
66e810cd | 4480 | |
cca44b1b | 4481 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
66e810cd | 4482 | |
9779414d | 4483 | return (ps & t_bit) == 0; |
cca44b1b | 4484 | } |
66e810cd | 4485 | |
cca44b1b | 4486 | /* Write to the PC as from a branch instruction. */ |
c906108c | 4487 | |
cca44b1b | 4488 | static void |
cfba9872 | 4489 | branch_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc, |
36073a92 | 4490 | ULONGEST val) |
c906108c | 4491 | { |
36073a92 | 4492 | if (!dsc->is_thumb) |
cca44b1b JB |
4493 | /* Note: If bits 0/1 are set, this branch would be unpredictable for |
4494 | architecture versions < 6. */ | |
0963b4bd MS |
4495 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
4496 | val & ~(ULONGEST) 0x3); | |
cca44b1b | 4497 | else |
0963b4bd MS |
4498 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
4499 | val & ~(ULONGEST) 0x1); | |
cca44b1b | 4500 | } |
66e810cd | 4501 | |
cca44b1b JB |
4502 | /* Write to the PC as from a branch-exchange instruction. */ |
4503 | ||
4504 | static void | |
4505 | bx_write_pc (struct regcache *regs, ULONGEST val) | |
4506 | { | |
4507 | ULONGEST ps; | |
ac7936df | 4508 | ULONGEST t_bit = arm_psr_thumb_bit (regs->arch ()); |
cca44b1b JB |
4509 | |
4510 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); | |
4511 | ||
4512 | if ((val & 1) == 1) | |
c906108c | 4513 | { |
9779414d | 4514 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit); |
cca44b1b JB |
4515 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe); |
4516 | } | |
4517 | else if ((val & 2) == 0) | |
4518 | { | |
9779414d | 4519 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 4520 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val); |
c906108c SS |
4521 | } |
4522 | else | |
4523 | { | |
cca44b1b JB |
4524 | /* Unpredictable behaviour. Try to do something sensible (switch to ARM |
4525 | mode, align dest to 4 bytes). */ | |
4526 | warning (_("Single-stepping BX to non-word-aligned ARM instruction.")); | |
9779414d | 4527 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 4528 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc); |
c906108c SS |
4529 | } |
4530 | } | |
ed9a39eb | 4531 | |
cca44b1b | 4532 | /* Write to the PC as if from a load instruction. */ |
ed9a39eb | 4533 | |
34e8f22d | 4534 | static void |
cfba9872 | 4535 | load_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc, |
36073a92 | 4536 | ULONGEST val) |
ed9a39eb | 4537 | { |
cca44b1b JB |
4538 | if (DISPLACED_STEPPING_ARCH_VERSION >= 5) |
4539 | bx_write_pc (regs, val); | |
4540 | else | |
36073a92 | 4541 | branch_write_pc (regs, dsc, val); |
cca44b1b | 4542 | } |
be8626e0 | 4543 | |
cca44b1b JB |
4544 | /* Write to the PC as if from an ALU instruction. */ |
4545 | ||
4546 | static void | |
cfba9872 | 4547 | alu_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc, |
36073a92 | 4548 | ULONGEST val) |
cca44b1b | 4549 | { |
36073a92 | 4550 | if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb) |
cca44b1b JB |
4551 | bx_write_pc (regs, val); |
4552 | else | |
36073a92 | 4553 | branch_write_pc (regs, dsc, val); |
cca44b1b JB |
4554 | } |
4555 | ||
4556 | /* Helper for writing to registers for displaced stepping. Writing to the PC | |
4557 | has a varying effects depending on the instruction which does the write: | |
4558 | this is controlled by the WRITE_PC argument. */ | |
4559 | ||
4560 | void | |
cfba9872 | 4561 | displaced_write_reg (struct regcache *regs, arm_displaced_step_closure *dsc, |
cca44b1b JB |
4562 | int regno, ULONGEST val, enum pc_write_style write_pc) |
4563 | { | |
bf9f652a | 4564 | if (regno == ARM_PC_REGNUM) |
08216dd7 | 4565 | { |
cca44b1b JB |
4566 | if (debug_displaced) |
4567 | fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n", | |
4568 | (unsigned long) val); | |
4569 | switch (write_pc) | |
08216dd7 | 4570 | { |
cca44b1b | 4571 | case BRANCH_WRITE_PC: |
36073a92 | 4572 | branch_write_pc (regs, dsc, val); |
08216dd7 RE |
4573 | break; |
4574 | ||
cca44b1b JB |
4575 | case BX_WRITE_PC: |
4576 | bx_write_pc (regs, val); | |
4577 | break; | |
4578 | ||
4579 | case LOAD_WRITE_PC: | |
36073a92 | 4580 | load_write_pc (regs, dsc, val); |
cca44b1b JB |
4581 | break; |
4582 | ||
4583 | case ALU_WRITE_PC: | |
36073a92 | 4584 | alu_write_pc (regs, dsc, val); |
cca44b1b JB |
4585 | break; |
4586 | ||
4587 | case CANNOT_WRITE_PC: | |
4588 | warning (_("Instruction wrote to PC in an unexpected way when " | |
4589 | "single-stepping")); | |
08216dd7 RE |
4590 | break; |
4591 | ||
4592 | default: | |
97b9747c JB |
4593 | internal_error (__FILE__, __LINE__, |
4594 | _("Invalid argument to displaced_write_reg")); | |
08216dd7 | 4595 | } |
b508a996 | 4596 | |
cca44b1b | 4597 | dsc->wrote_to_pc = 1; |
b508a996 | 4598 | } |
ed9a39eb | 4599 | else |
b508a996 | 4600 | { |
cca44b1b JB |
4601 | if (debug_displaced) |
4602 | fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n", | |
4603 | regno, (unsigned long) val); | |
4604 | regcache_cooked_write_unsigned (regs, regno, val); | |
b508a996 | 4605 | } |
34e8f22d RE |
4606 | } |
4607 | ||
cca44b1b JB |
4608 | /* This function is used to concisely determine if an instruction INSN |
4609 | references PC. Register fields of interest in INSN should have the | |
0963b4bd MS |
4610 | corresponding fields of BITMASK set to 0b1111. The function |
4611 | returns return 1 if any of these fields in INSN reference the PC | |
4612 | (also 0b1111, r15), else it returns 0. */ | |
67255d04 RE |
4613 | |
4614 | static int | |
cca44b1b | 4615 | insn_references_pc (uint32_t insn, uint32_t bitmask) |
67255d04 | 4616 | { |
cca44b1b | 4617 | uint32_t lowbit = 1; |
67255d04 | 4618 | |
cca44b1b JB |
4619 | while (bitmask != 0) |
4620 | { | |
4621 | uint32_t mask; | |
44e1a9eb | 4622 | |
cca44b1b JB |
4623 | for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1) |
4624 | ; | |
67255d04 | 4625 | |
cca44b1b JB |
4626 | if (!lowbit) |
4627 | break; | |
67255d04 | 4628 | |
cca44b1b | 4629 | mask = lowbit * 0xf; |
67255d04 | 4630 | |
cca44b1b JB |
4631 | if ((insn & mask) == mask) |
4632 | return 1; | |
4633 | ||
4634 | bitmask &= ~mask; | |
67255d04 RE |
4635 | } |
4636 | ||
cca44b1b JB |
4637 | return 0; |
4638 | } | |
2af48f68 | 4639 | |
cca44b1b JB |
4640 | /* The simplest copy function. Many instructions have the same effect no |
4641 | matter what address they are executed at: in those cases, use this. */ | |
67255d04 | 4642 | |
cca44b1b | 4643 | static int |
7ff120b4 | 4644 | arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, |
cfba9872 | 4645 | const char *iname, arm_displaced_step_closure *dsc) |
cca44b1b JB |
4646 | { |
4647 | if (debug_displaced) | |
4648 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, " | |
4649 | "opcode/class '%s' unmodified\n", (unsigned long) insn, | |
4650 | iname); | |
67255d04 | 4651 | |
cca44b1b | 4652 | dsc->modinsn[0] = insn; |
67255d04 | 4653 | |
cca44b1b JB |
4654 | return 0; |
4655 | } | |
4656 | ||
34518530 YQ |
4657 | static int |
4658 | thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
4659 | uint16_t insn2, const char *iname, | |
cfba9872 | 4660 | arm_displaced_step_closure *dsc) |
34518530 YQ |
4661 | { |
4662 | if (debug_displaced) | |
4663 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x %.4x, " | |
4664 | "opcode/class '%s' unmodified\n", insn1, insn2, | |
4665 | iname); | |
4666 | ||
4667 | dsc->modinsn[0] = insn1; | |
4668 | dsc->modinsn[1] = insn2; | |
4669 | dsc->numinsns = 2; | |
4670 | ||
4671 | return 0; | |
4672 | } | |
4673 | ||
4674 | /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any | |
4675 | modification. */ | |
4676 | static int | |
615234c1 | 4677 | thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, uint16_t insn, |
34518530 | 4678 | const char *iname, |
cfba9872 | 4679 | arm_displaced_step_closure *dsc) |
34518530 YQ |
4680 | { |
4681 | if (debug_displaced) | |
4682 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x, " | |
4683 | "opcode/class '%s' unmodified\n", insn, | |
4684 | iname); | |
4685 | ||
4686 | dsc->modinsn[0] = insn; | |
4687 | ||
4688 | return 0; | |
4689 | } | |
4690 | ||
cca44b1b JB |
4691 | /* Preload instructions with immediate offset. */ |
4692 | ||
4693 | static void | |
6e39997a | 4694 | cleanup_preload (struct gdbarch *gdbarch, |
cfba9872 | 4695 | struct regcache *regs, arm_displaced_step_closure *dsc) |
cca44b1b JB |
4696 | { |
4697 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
4698 | if (!dsc->u.preload.immed) | |
4699 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
4700 | } | |
4701 | ||
7ff120b4 YQ |
4702 | static void |
4703 | install_preload (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 4704 | arm_displaced_step_closure *dsc, unsigned int rn) |
cca44b1b | 4705 | { |
cca44b1b | 4706 | ULONGEST rn_val; |
cca44b1b JB |
4707 | /* Preload instructions: |
4708 | ||
4709 | {pli/pld} [rn, #+/-imm] | |
4710 | -> | |
4711 | {pli/pld} [r0, #+/-imm]. */ | |
4712 | ||
36073a92 YQ |
4713 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
4714 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 4715 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
cca44b1b JB |
4716 | dsc->u.preload.immed = 1; |
4717 | ||
cca44b1b | 4718 | dsc->cleanup = &cleanup_preload; |
cca44b1b JB |
4719 | } |
4720 | ||
cca44b1b | 4721 | static int |
7ff120b4 | 4722 | arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
cfba9872 | 4723 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
4724 | { |
4725 | unsigned int rn = bits (insn, 16, 19); | |
cca44b1b | 4726 | |
7ff120b4 YQ |
4727 | if (!insn_references_pc (insn, 0x000f0000ul)) |
4728 | return arm_copy_unmodified (gdbarch, insn, "preload", dsc); | |
cca44b1b JB |
4729 | |
4730 | if (debug_displaced) | |
4731 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
4732 | (unsigned long) insn); | |
4733 | ||
7ff120b4 YQ |
4734 | dsc->modinsn[0] = insn & 0xfff0ffff; |
4735 | ||
4736 | install_preload (gdbarch, regs, dsc, rn); | |
4737 | ||
4738 | return 0; | |
4739 | } | |
4740 | ||
34518530 YQ |
4741 | static int |
4742 | thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
cfba9872 | 4743 | struct regcache *regs, arm_displaced_step_closure *dsc) |
34518530 YQ |
4744 | { |
4745 | unsigned int rn = bits (insn1, 0, 3); | |
4746 | unsigned int u_bit = bit (insn1, 7); | |
4747 | int imm12 = bits (insn2, 0, 11); | |
4748 | ULONGEST pc_val; | |
4749 | ||
4750 | if (rn != ARM_PC_REGNUM) | |
4751 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "preload", dsc); | |
4752 | ||
4753 | /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and | |
4754 | PLD (literal) Encoding T1. */ | |
4755 | if (debug_displaced) | |
4756 | fprintf_unfiltered (gdb_stdlog, | |
4757 | "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n", | |
4758 | (unsigned int) dsc->insn_addr, u_bit ? '+' : '-', | |
4759 | imm12); | |
4760 | ||
4761 | if (!u_bit) | |
4762 | imm12 = -1 * imm12; | |
4763 | ||
4764 | /* Rewrite instruction {pli/pld} PC imm12 into: | |
4765 | Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12 | |
4766 | ||
4767 | {pli/pld} [r0, r1] | |
4768 | ||
4769 | Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */ | |
4770 | ||
4771 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
4772 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
4773 | ||
4774 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
4775 | ||
4776 | displaced_write_reg (regs, dsc, 0, pc_val, CANNOT_WRITE_PC); | |
4777 | displaced_write_reg (regs, dsc, 1, imm12, CANNOT_WRITE_PC); | |
4778 | dsc->u.preload.immed = 0; | |
4779 | ||
4780 | /* {pli/pld} [r0, r1] */ | |
4781 | dsc->modinsn[0] = insn1 & 0xfff0; | |
4782 | dsc->modinsn[1] = 0xf001; | |
4783 | dsc->numinsns = 2; | |
4784 | ||
4785 | dsc->cleanup = &cleanup_preload; | |
4786 | return 0; | |
4787 | } | |
4788 | ||
7ff120b4 YQ |
4789 | /* Preload instructions with register offset. */ |
4790 | ||
4791 | static void | |
4792 | install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 4793 | arm_displaced_step_closure *dsc, unsigned int rn, |
7ff120b4 YQ |
4794 | unsigned int rm) |
4795 | { | |
4796 | ULONGEST rn_val, rm_val; | |
4797 | ||
cca44b1b JB |
4798 | /* Preload register-offset instructions: |
4799 | ||
4800 | {pli/pld} [rn, rm {, shift}] | |
4801 | -> | |
4802 | {pli/pld} [r0, r1 {, shift}]. */ | |
4803 | ||
36073a92 YQ |
4804 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
4805 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
4806 | rn_val = displaced_read_reg (regs, dsc, rn); | |
4807 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
4808 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
4809 | displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC); | |
cca44b1b JB |
4810 | dsc->u.preload.immed = 0; |
4811 | ||
cca44b1b | 4812 | dsc->cleanup = &cleanup_preload; |
7ff120b4 YQ |
4813 | } |
4814 | ||
4815 | static int | |
4816 | arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, | |
4817 | struct regcache *regs, | |
cfba9872 | 4818 | arm_displaced_step_closure *dsc) |
7ff120b4 YQ |
4819 | { |
4820 | unsigned int rn = bits (insn, 16, 19); | |
4821 | unsigned int rm = bits (insn, 0, 3); | |
4822 | ||
4823 | ||
4824 | if (!insn_references_pc (insn, 0x000f000ful)) | |
4825 | return arm_copy_unmodified (gdbarch, insn, "preload reg", dsc); | |
4826 | ||
4827 | if (debug_displaced) | |
4828 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
4829 | (unsigned long) insn); | |
4830 | ||
4831 | dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1; | |
cca44b1b | 4832 | |
7ff120b4 | 4833 | install_preload_reg (gdbarch, regs, dsc, rn, rm); |
cca44b1b JB |
4834 | return 0; |
4835 | } | |
4836 | ||
4837 | /* Copy/cleanup coprocessor load and store instructions. */ | |
4838 | ||
4839 | static void | |
6e39997a | 4840 | cleanup_copro_load_store (struct gdbarch *gdbarch, |
cca44b1b | 4841 | struct regcache *regs, |
cfba9872 | 4842 | arm_displaced_step_closure *dsc) |
cca44b1b | 4843 | { |
36073a92 | 4844 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
4845 | |
4846 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
4847 | ||
4848 | if (dsc->u.ldst.writeback) | |
4849 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC); | |
4850 | } | |
4851 | ||
7ff120b4 YQ |
4852 | static void |
4853 | install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 4854 | arm_displaced_step_closure *dsc, |
7ff120b4 | 4855 | int writeback, unsigned int rn) |
cca44b1b | 4856 | { |
cca44b1b | 4857 | ULONGEST rn_val; |
cca44b1b | 4858 | |
cca44b1b JB |
4859 | /* Coprocessor load/store instructions: |
4860 | ||
4861 | {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes) | |
4862 | -> | |
4863 | {stc/stc2} [r0, #+/-imm]. | |
4864 | ||
4865 | ldc/ldc2 are handled identically. */ | |
4866 | ||
36073a92 YQ |
4867 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
4868 | rn_val = displaced_read_reg (regs, dsc, rn); | |
2b16b2e3 YQ |
4869 | /* PC should be 4-byte aligned. */ |
4870 | rn_val = rn_val & 0xfffffffc; | |
cca44b1b JB |
4871 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
4872 | ||
7ff120b4 | 4873 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
4874 | dsc->u.ldst.rn = rn; |
4875 | ||
7ff120b4 YQ |
4876 | dsc->cleanup = &cleanup_copro_load_store; |
4877 | } | |
4878 | ||
4879 | static int | |
4880 | arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn, | |
4881 | struct regcache *regs, | |
cfba9872 | 4882 | arm_displaced_step_closure *dsc) |
7ff120b4 YQ |
4883 | { |
4884 | unsigned int rn = bits (insn, 16, 19); | |
4885 | ||
4886 | if (!insn_references_pc (insn, 0x000f0000ul)) | |
4887 | return arm_copy_unmodified (gdbarch, insn, "copro load/store", dsc); | |
4888 | ||
4889 | if (debug_displaced) | |
4890 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
4891 | "load/store insn %.8lx\n", (unsigned long) insn); | |
4892 | ||
cca44b1b JB |
4893 | dsc->modinsn[0] = insn & 0xfff0ffff; |
4894 | ||
7ff120b4 | 4895 | install_copro_load_store (gdbarch, regs, dsc, bit (insn, 25), rn); |
cca44b1b JB |
4896 | |
4897 | return 0; | |
4898 | } | |
4899 | ||
34518530 YQ |
4900 | static int |
4901 | thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1, | |
4902 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 4903 | arm_displaced_step_closure *dsc) |
34518530 YQ |
4904 | { |
4905 | unsigned int rn = bits (insn1, 0, 3); | |
4906 | ||
4907 | if (rn != ARM_PC_REGNUM) | |
4908 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
4909 | "copro load/store", dsc); | |
4910 | ||
4911 | if (debug_displaced) | |
4912 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
4913 | "load/store insn %.4x%.4x\n", insn1, insn2); | |
4914 | ||
4915 | dsc->modinsn[0] = insn1 & 0xfff0; | |
4916 | dsc->modinsn[1] = insn2; | |
4917 | dsc->numinsns = 2; | |
4918 | ||
4919 | /* This function is called for copying instruction LDC/LDC2/VLDR, which | |
4920 | doesn't support writeback, so pass 0. */ | |
4921 | install_copro_load_store (gdbarch, regs, dsc, 0, rn); | |
4922 | ||
4923 | return 0; | |
4924 | } | |
4925 | ||
cca44b1b JB |
4926 | /* Clean up branch instructions (actually perform the branch, by setting |
4927 | PC). */ | |
4928 | ||
4929 | static void | |
6e39997a | 4930 | cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs, |
cfba9872 | 4931 | arm_displaced_step_closure *dsc) |
cca44b1b | 4932 | { |
36073a92 | 4933 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
4934 | int branch_taken = condition_true (dsc->u.branch.cond, status); |
4935 | enum pc_write_style write_pc = dsc->u.branch.exchange | |
4936 | ? BX_WRITE_PC : BRANCH_WRITE_PC; | |
4937 | ||
4938 | if (!branch_taken) | |
4939 | return; | |
4940 | ||
4941 | if (dsc->u.branch.link) | |
4942 | { | |
8c8dba6d | 4943 | /* The value of LR should be the next insn of current one. In order |
85102364 | 4944 | not to confuse logic handling later insn `bx lr', if current insn mode |
8c8dba6d YQ |
4945 | is Thumb, the bit 0 of LR value should be set to 1. */ |
4946 | ULONGEST next_insn_addr = dsc->insn_addr + dsc->insn_size; | |
4947 | ||
4948 | if (dsc->is_thumb) | |
4949 | next_insn_addr |= 0x1; | |
4950 | ||
4951 | displaced_write_reg (regs, dsc, ARM_LR_REGNUM, next_insn_addr, | |
4952 | CANNOT_WRITE_PC); | |
cca44b1b JB |
4953 | } |
4954 | ||
bf9f652a | 4955 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc); |
cca44b1b JB |
4956 | } |
4957 | ||
4958 | /* Copy B/BL/BLX instructions with immediate destinations. */ | |
4959 | ||
7ff120b4 YQ |
4960 | static void |
4961 | install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 4962 | arm_displaced_step_closure *dsc, |
7ff120b4 YQ |
4963 | unsigned int cond, int exchange, int link, long offset) |
4964 | { | |
4965 | /* Implement "BL<cond> <label>" as: | |
4966 | ||
4967 | Preparation: cond <- instruction condition | |
4968 | Insn: mov r0, r0 (nop) | |
4969 | Cleanup: if (condition true) { r14 <- pc; pc <- label }. | |
4970 | ||
4971 | B<cond> similar, but don't set r14 in cleanup. */ | |
4972 | ||
4973 | dsc->u.branch.cond = cond; | |
4974 | dsc->u.branch.link = link; | |
4975 | dsc->u.branch.exchange = exchange; | |
4976 | ||
2b16b2e3 YQ |
4977 | dsc->u.branch.dest = dsc->insn_addr; |
4978 | if (link && exchange) | |
4979 | /* For BLX, offset is computed from the Align (PC, 4). */ | |
4980 | dsc->u.branch.dest = dsc->u.branch.dest & 0xfffffffc; | |
4981 | ||
7ff120b4 | 4982 | if (dsc->is_thumb) |
2b16b2e3 | 4983 | dsc->u.branch.dest += 4 + offset; |
7ff120b4 | 4984 | else |
2b16b2e3 | 4985 | dsc->u.branch.dest += 8 + offset; |
7ff120b4 YQ |
4986 | |
4987 | dsc->cleanup = &cleanup_branch; | |
4988 | } | |
cca44b1b | 4989 | static int |
7ff120b4 | 4990 | arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn, |
cfba9872 | 4991 | struct regcache *regs, arm_displaced_step_closure *dsc) |
cca44b1b JB |
4992 | { |
4993 | unsigned int cond = bits (insn, 28, 31); | |
4994 | int exchange = (cond == 0xf); | |
4995 | int link = exchange || bit (insn, 24); | |
cca44b1b JB |
4996 | long offset; |
4997 | ||
4998 | if (debug_displaced) | |
4999 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn " | |
5000 | "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b", | |
5001 | (unsigned long) insn); | |
cca44b1b JB |
5002 | if (exchange) |
5003 | /* For BLX, set bit 0 of the destination. The cleanup_branch function will | |
5004 | then arrange the switch into Thumb mode. */ | |
5005 | offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1; | |
5006 | else | |
5007 | offset = bits (insn, 0, 23) << 2; | |
5008 | ||
5009 | if (bit (offset, 25)) | |
5010 | offset = offset | ~0x3ffffff; | |
5011 | ||
cca44b1b JB |
5012 | dsc->modinsn[0] = ARM_NOP; |
5013 | ||
7ff120b4 | 5014 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); |
cca44b1b JB |
5015 | return 0; |
5016 | } | |
5017 | ||
34518530 YQ |
5018 | static int |
5019 | thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1, | |
5020 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 5021 | arm_displaced_step_closure *dsc) |
34518530 YQ |
5022 | { |
5023 | int link = bit (insn2, 14); | |
5024 | int exchange = link && !bit (insn2, 12); | |
5025 | int cond = INST_AL; | |
5026 | long offset = 0; | |
5027 | int j1 = bit (insn2, 13); | |
5028 | int j2 = bit (insn2, 11); | |
5029 | int s = sbits (insn1, 10, 10); | |
5030 | int i1 = !(j1 ^ bit (insn1, 10)); | |
5031 | int i2 = !(j2 ^ bit (insn1, 10)); | |
5032 | ||
5033 | if (!link && !exchange) /* B */ | |
5034 | { | |
5035 | offset = (bits (insn2, 0, 10) << 1); | |
5036 | if (bit (insn2, 12)) /* Encoding T4 */ | |
5037 | { | |
5038 | offset |= (bits (insn1, 0, 9) << 12) | |
5039 | | (i2 << 22) | |
5040 | | (i1 << 23) | |
5041 | | (s << 24); | |
5042 | cond = INST_AL; | |
5043 | } | |
5044 | else /* Encoding T3 */ | |
5045 | { | |
5046 | offset |= (bits (insn1, 0, 5) << 12) | |
5047 | | (j1 << 18) | |
5048 | | (j2 << 19) | |
5049 | | (s << 20); | |
5050 | cond = bits (insn1, 6, 9); | |
5051 | } | |
5052 | } | |
5053 | else | |
5054 | { | |
5055 | offset = (bits (insn1, 0, 9) << 12); | |
5056 | offset |= ((i2 << 22) | (i1 << 23) | (s << 24)); | |
5057 | offset |= exchange ? | |
5058 | (bits (insn2, 1, 10) << 2) : (bits (insn2, 0, 10) << 1); | |
5059 | } | |
5060 | ||
5061 | if (debug_displaced) | |
5062 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s insn " | |
5063 | "%.4x %.4x with offset %.8lx\n", | |
5064 | link ? (exchange) ? "blx" : "bl" : "b", | |
5065 | insn1, insn2, offset); | |
5066 | ||
5067 | dsc->modinsn[0] = THUMB_NOP; | |
5068 | ||
5069 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); | |
5070 | return 0; | |
5071 | } | |
5072 | ||
5073 | /* Copy B Thumb instructions. */ | |
5074 | static int | |
615234c1 | 5075 | thumb_copy_b (struct gdbarch *gdbarch, uint16_t insn, |
cfba9872 | 5076 | arm_displaced_step_closure *dsc) |
34518530 YQ |
5077 | { |
5078 | unsigned int cond = 0; | |
5079 | int offset = 0; | |
5080 | unsigned short bit_12_15 = bits (insn, 12, 15); | |
5081 | CORE_ADDR from = dsc->insn_addr; | |
5082 | ||
5083 | if (bit_12_15 == 0xd) | |
5084 | { | |
5085 | /* offset = SignExtend (imm8:0, 32) */ | |
5086 | offset = sbits ((insn << 1), 0, 8); | |
5087 | cond = bits (insn, 8, 11); | |
5088 | } | |
5089 | else if (bit_12_15 == 0xe) /* Encoding T2 */ | |
5090 | { | |
5091 | offset = sbits ((insn << 1), 0, 11); | |
5092 | cond = INST_AL; | |
5093 | } | |
5094 | ||
5095 | if (debug_displaced) | |
5096 | fprintf_unfiltered (gdb_stdlog, | |
5097 | "displaced: copying b immediate insn %.4x " | |
5098 | "with offset %d\n", insn, offset); | |
5099 | ||
5100 | dsc->u.branch.cond = cond; | |
5101 | dsc->u.branch.link = 0; | |
5102 | dsc->u.branch.exchange = 0; | |
5103 | dsc->u.branch.dest = from + 4 + offset; | |
5104 | ||
5105 | dsc->modinsn[0] = THUMB_NOP; | |
5106 | ||
5107 | dsc->cleanup = &cleanup_branch; | |
5108 | ||
5109 | return 0; | |
5110 | } | |
5111 | ||
cca44b1b JB |
5112 | /* Copy BX/BLX with register-specified destinations. */ |
5113 | ||
7ff120b4 YQ |
5114 | static void |
5115 | install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 5116 | arm_displaced_step_closure *dsc, int link, |
7ff120b4 | 5117 | unsigned int cond, unsigned int rm) |
cca44b1b | 5118 | { |
cca44b1b JB |
5119 | /* Implement {BX,BLX}<cond> <reg>" as: |
5120 | ||
5121 | Preparation: cond <- instruction condition | |
5122 | Insn: mov r0, r0 (nop) | |
5123 | Cleanup: if (condition true) { r14 <- pc; pc <- dest; }. | |
5124 | ||
5125 | Don't set r14 in cleanup for BX. */ | |
5126 | ||
36073a92 | 5127 | dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
5128 | |
5129 | dsc->u.branch.cond = cond; | |
5130 | dsc->u.branch.link = link; | |
cca44b1b | 5131 | |
7ff120b4 | 5132 | dsc->u.branch.exchange = 1; |
cca44b1b JB |
5133 | |
5134 | dsc->cleanup = &cleanup_branch; | |
7ff120b4 | 5135 | } |
cca44b1b | 5136 | |
7ff120b4 YQ |
5137 | static int |
5138 | arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn, | |
cfba9872 | 5139 | struct regcache *regs, arm_displaced_step_closure *dsc) |
7ff120b4 YQ |
5140 | { |
5141 | unsigned int cond = bits (insn, 28, 31); | |
5142 | /* BX: x12xxx1x | |
5143 | BLX: x12xxx3x. */ | |
5144 | int link = bit (insn, 5); | |
5145 | unsigned int rm = bits (insn, 0, 3); | |
5146 | ||
5147 | if (debug_displaced) | |
5148 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx", | |
5149 | (unsigned long) insn); | |
5150 | ||
5151 | dsc->modinsn[0] = ARM_NOP; | |
5152 | ||
5153 | install_bx_blx_reg (gdbarch, regs, dsc, link, cond, rm); | |
cca44b1b JB |
5154 | return 0; |
5155 | } | |
5156 | ||
34518530 YQ |
5157 | static int |
5158 | thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn, | |
5159 | struct regcache *regs, | |
cfba9872 | 5160 | arm_displaced_step_closure *dsc) |
34518530 YQ |
5161 | { |
5162 | int link = bit (insn, 7); | |
5163 | unsigned int rm = bits (insn, 3, 6); | |
5164 | ||
5165 | if (debug_displaced) | |
5166 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x", | |
5167 | (unsigned short) insn); | |
5168 | ||
5169 | dsc->modinsn[0] = THUMB_NOP; | |
5170 | ||
5171 | install_bx_blx_reg (gdbarch, regs, dsc, link, INST_AL, rm); | |
5172 | ||
5173 | return 0; | |
5174 | } | |
5175 | ||
5176 | ||
0963b4bd | 5177 | /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */ |
cca44b1b JB |
5178 | |
5179 | static void | |
6e39997a | 5180 | cleanup_alu_imm (struct gdbarch *gdbarch, |
cfba9872 | 5181 | struct regcache *regs, arm_displaced_step_closure *dsc) |
cca44b1b | 5182 | { |
36073a92 | 5183 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5184 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
5185 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5186 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
5187 | } | |
5188 | ||
5189 | static int | |
7ff120b4 | 5190 | arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
cfba9872 | 5191 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
5192 | { |
5193 | unsigned int rn = bits (insn, 16, 19); | |
5194 | unsigned int rd = bits (insn, 12, 15); | |
5195 | unsigned int op = bits (insn, 21, 24); | |
5196 | int is_mov = (op == 0xd); | |
5197 | ULONGEST rd_val, rn_val; | |
cca44b1b JB |
5198 | |
5199 | if (!insn_references_pc (insn, 0x000ff000ul)) | |
7ff120b4 | 5200 | return arm_copy_unmodified (gdbarch, insn, "ALU immediate", dsc); |
cca44b1b JB |
5201 | |
5202 | if (debug_displaced) | |
5203 | fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn " | |
5204 | "%.8lx\n", is_mov ? "move" : "ALU", | |
5205 | (unsigned long) insn); | |
5206 | ||
5207 | /* Instruction is of form: | |
5208 | ||
5209 | <op><cond> rd, [rn,] #imm | |
5210 | ||
5211 | Rewrite as: | |
5212 | ||
5213 | Preparation: tmp1, tmp2 <- r0, r1; | |
5214 | r0, r1 <- rd, rn | |
5215 | Insn: <op><cond> r0, r1, #imm | |
5216 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
5217 | */ | |
5218 | ||
36073a92 YQ |
5219 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5220 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5221 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5222 | rd_val = displaced_read_reg (regs, dsc, rd); | |
cca44b1b JB |
5223 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
5224 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5225 | dsc->rd = rd; | |
5226 | ||
5227 | if (is_mov) | |
5228 | dsc->modinsn[0] = insn & 0xfff00fff; | |
5229 | else | |
5230 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000; | |
5231 | ||
5232 | dsc->cleanup = &cleanup_alu_imm; | |
5233 | ||
5234 | return 0; | |
5235 | } | |
5236 | ||
34518530 YQ |
5237 | static int |
5238 | thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
5239 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 5240 | arm_displaced_step_closure *dsc) |
34518530 YQ |
5241 | { |
5242 | unsigned int op = bits (insn1, 5, 8); | |
5243 | unsigned int rn, rm, rd; | |
5244 | ULONGEST rd_val, rn_val; | |
5245 | ||
5246 | rn = bits (insn1, 0, 3); /* Rn */ | |
5247 | rm = bits (insn2, 0, 3); /* Rm */ | |
5248 | rd = bits (insn2, 8, 11); /* Rd */ | |
5249 | ||
5250 | /* This routine is only called for instruction MOV. */ | |
5251 | gdb_assert (op == 0x2 && rn == 0xf); | |
5252 | ||
5253 | if (rm != ARM_PC_REGNUM && rd != ARM_PC_REGNUM) | |
5254 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ALU imm", dsc); | |
5255 | ||
5256 | if (debug_displaced) | |
5257 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x%.4x\n", | |
5258 | "ALU", insn1, insn2); | |
5259 | ||
5260 | /* Instruction is of form: | |
5261 | ||
5262 | <op><cond> rd, [rn,] #imm | |
5263 | ||
5264 | Rewrite as: | |
5265 | ||
5266 | Preparation: tmp1, tmp2 <- r0, r1; | |
5267 | r0, r1 <- rd, rn | |
5268 | Insn: <op><cond> r0, r1, #imm | |
5269 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
5270 | */ | |
5271 | ||
5272 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
5273 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5274 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5275 | rd_val = displaced_read_reg (regs, dsc, rd); | |
5276 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); | |
5277 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5278 | dsc->rd = rd; | |
5279 | ||
5280 | dsc->modinsn[0] = insn1; | |
5281 | dsc->modinsn[1] = ((insn2 & 0xf0f0) | 0x1); | |
5282 | dsc->numinsns = 2; | |
5283 | ||
5284 | dsc->cleanup = &cleanup_alu_imm; | |
5285 | ||
5286 | return 0; | |
5287 | } | |
5288 | ||
cca44b1b JB |
5289 | /* Copy/cleanup arithmetic/logic insns with register RHS. */ |
5290 | ||
5291 | static void | |
6e39997a | 5292 | cleanup_alu_reg (struct gdbarch *gdbarch, |
cfba9872 | 5293 | struct regcache *regs, arm_displaced_step_closure *dsc) |
cca44b1b JB |
5294 | { |
5295 | ULONGEST rd_val; | |
5296 | int i; | |
5297 | ||
36073a92 | 5298 | rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5299 | |
5300 | for (i = 0; i < 3; i++) | |
5301 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
5302 | ||
5303 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
5304 | } | |
5305 | ||
7ff120b4 YQ |
5306 | static void |
5307 | install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 5308 | arm_displaced_step_closure *dsc, |
7ff120b4 | 5309 | unsigned int rd, unsigned int rn, unsigned int rm) |
cca44b1b | 5310 | { |
cca44b1b | 5311 | ULONGEST rd_val, rn_val, rm_val; |
cca44b1b | 5312 | |
cca44b1b JB |
5313 | /* Instruction is of form: |
5314 | ||
5315 | <op><cond> rd, [rn,] rm [, <shift>] | |
5316 | ||
5317 | Rewrite as: | |
5318 | ||
5319 | Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2; | |
5320 | r0, r1, r2 <- rd, rn, rm | |
ef713951 | 5321 | Insn: <op><cond> r0, [r1,] r2 [, <shift>] |
cca44b1b JB |
5322 | Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3 |
5323 | */ | |
5324 | ||
36073a92 YQ |
5325 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5326 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5327 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
5328 | rd_val = displaced_read_reg (regs, dsc, rd); | |
5329 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5330 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
5331 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
5332 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5333 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
5334 | dsc->rd = rd; | |
5335 | ||
7ff120b4 YQ |
5336 | dsc->cleanup = &cleanup_alu_reg; |
5337 | } | |
5338 | ||
5339 | static int | |
5340 | arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
cfba9872 | 5341 | arm_displaced_step_closure *dsc) |
7ff120b4 YQ |
5342 | { |
5343 | unsigned int op = bits (insn, 21, 24); | |
5344 | int is_mov = (op == 0xd); | |
5345 | ||
5346 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
5347 | return arm_copy_unmodified (gdbarch, insn, "ALU reg", dsc); | |
5348 | ||
5349 | if (debug_displaced) | |
5350 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n", | |
5351 | is_mov ? "move" : "ALU", (unsigned long) insn); | |
5352 | ||
cca44b1b JB |
5353 | if (is_mov) |
5354 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2; | |
5355 | else | |
5356 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002; | |
5357 | ||
7ff120b4 YQ |
5358 | install_alu_reg (gdbarch, regs, dsc, bits (insn, 12, 15), bits (insn, 16, 19), |
5359 | bits (insn, 0, 3)); | |
cca44b1b JB |
5360 | return 0; |
5361 | } | |
5362 | ||
34518530 YQ |
5363 | static int |
5364 | thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn, | |
5365 | struct regcache *regs, | |
cfba9872 | 5366 | arm_displaced_step_closure *dsc) |
34518530 | 5367 | { |
ef713951 | 5368 | unsigned rm, rd; |
34518530 | 5369 | |
ef713951 YQ |
5370 | rm = bits (insn, 3, 6); |
5371 | rd = (bit (insn, 7) << 3) | bits (insn, 0, 2); | |
34518530 | 5372 | |
ef713951 | 5373 | if (rd != ARM_PC_REGNUM && rm != ARM_PC_REGNUM) |
34518530 YQ |
5374 | return thumb_copy_unmodified_16bit (gdbarch, insn, "ALU reg", dsc); |
5375 | ||
5376 | if (debug_displaced) | |
ef713951 YQ |
5377 | fprintf_unfiltered (gdb_stdlog, "displaced: copying ALU reg insn %.4x\n", |
5378 | (unsigned short) insn); | |
34518530 | 5379 | |
ef713951 | 5380 | dsc->modinsn[0] = ((insn & 0xff00) | 0x10); |
34518530 | 5381 | |
ef713951 | 5382 | install_alu_reg (gdbarch, regs, dsc, rd, rd, rm); |
34518530 YQ |
5383 | |
5384 | return 0; | |
5385 | } | |
5386 | ||
cca44b1b JB |
5387 | /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */ |
5388 | ||
5389 | static void | |
6e39997a | 5390 | cleanup_alu_shifted_reg (struct gdbarch *gdbarch, |
cca44b1b | 5391 | struct regcache *regs, |
cfba9872 | 5392 | arm_displaced_step_closure *dsc) |
cca44b1b | 5393 | { |
36073a92 | 5394 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5395 | int i; |
5396 | ||
5397 | for (i = 0; i < 4; i++) | |
5398 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
5399 | ||
5400 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
5401 | } | |
5402 | ||
7ff120b4 YQ |
5403 | static void |
5404 | install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 5405 | arm_displaced_step_closure *dsc, |
7ff120b4 YQ |
5406 | unsigned int rd, unsigned int rn, unsigned int rm, |
5407 | unsigned rs) | |
cca44b1b | 5408 | { |
7ff120b4 | 5409 | int i; |
cca44b1b | 5410 | ULONGEST rd_val, rn_val, rm_val, rs_val; |
cca44b1b | 5411 | |
cca44b1b JB |
5412 | /* Instruction is of form: |
5413 | ||
5414 | <op><cond> rd, [rn,] rm, <shift> rs | |
5415 | ||
5416 | Rewrite as: | |
5417 | ||
5418 | Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3 | |
5419 | r0, r1, r2, r3 <- rd, rn, rm, rs | |
5420 | Insn: <op><cond> r0, r1, r2, <shift> r3 | |
5421 | Cleanup: tmp5 <- r0 | |
5422 | r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4 | |
5423 | rd <- tmp5 | |
5424 | */ | |
5425 | ||
5426 | for (i = 0; i < 4; i++) | |
36073a92 | 5427 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b | 5428 | |
36073a92 YQ |
5429 | rd_val = displaced_read_reg (regs, dsc, rd); |
5430 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5431 | rm_val = displaced_read_reg (regs, dsc, rm); | |
5432 | rs_val = displaced_read_reg (regs, dsc, rs); | |
cca44b1b JB |
5433 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
5434 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5435 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
5436 | displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC); | |
5437 | dsc->rd = rd; | |
7ff120b4 YQ |
5438 | dsc->cleanup = &cleanup_alu_shifted_reg; |
5439 | } | |
5440 | ||
5441 | static int | |
5442 | arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn, | |
5443 | struct regcache *regs, | |
cfba9872 | 5444 | arm_displaced_step_closure *dsc) |
7ff120b4 YQ |
5445 | { |
5446 | unsigned int op = bits (insn, 21, 24); | |
5447 | int is_mov = (op == 0xd); | |
5448 | unsigned int rd, rn, rm, rs; | |
5449 | ||
5450 | if (!insn_references_pc (insn, 0x000fff0ful)) | |
5451 | return arm_copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc); | |
5452 | ||
5453 | if (debug_displaced) | |
5454 | fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn " | |
5455 | "%.8lx\n", is_mov ? "move" : "ALU", | |
5456 | (unsigned long) insn); | |
5457 | ||
5458 | rn = bits (insn, 16, 19); | |
5459 | rm = bits (insn, 0, 3); | |
5460 | rs = bits (insn, 8, 11); | |
5461 | rd = bits (insn, 12, 15); | |
cca44b1b JB |
5462 | |
5463 | if (is_mov) | |
5464 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302; | |
5465 | else | |
5466 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302; | |
5467 | ||
7ff120b4 | 5468 | install_alu_shifted_reg (gdbarch, regs, dsc, rd, rn, rm, rs); |
cca44b1b JB |
5469 | |
5470 | return 0; | |
5471 | } | |
5472 | ||
5473 | /* Clean up load instructions. */ | |
5474 | ||
5475 | static void | |
6e39997a | 5476 | cleanup_load (struct gdbarch *gdbarch, struct regcache *regs, |
cfba9872 | 5477 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
5478 | { |
5479 | ULONGEST rt_val, rt_val2 = 0, rn_val; | |
cca44b1b | 5480 | |
36073a92 | 5481 | rt_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b | 5482 | if (dsc->u.ldst.xfersize == 8) |
36073a92 YQ |
5483 | rt_val2 = displaced_read_reg (regs, dsc, 1); |
5484 | rn_val = displaced_read_reg (regs, dsc, 2); | |
cca44b1b JB |
5485 | |
5486 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5487 | if (dsc->u.ldst.xfersize > 4) | |
5488 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5489 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
5490 | if (!dsc->u.ldst.immed) | |
5491 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
5492 | ||
5493 | /* Handle register writeback. */ | |
5494 | if (dsc->u.ldst.writeback) | |
5495 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
5496 | /* Put result in right place. */ | |
5497 | displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC); | |
5498 | if (dsc->u.ldst.xfersize == 8) | |
5499 | displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC); | |
5500 | } | |
5501 | ||
5502 | /* Clean up store instructions. */ | |
5503 | ||
5504 | static void | |
6e39997a | 5505 | cleanup_store (struct gdbarch *gdbarch, struct regcache *regs, |
cfba9872 | 5506 | arm_displaced_step_closure *dsc) |
cca44b1b | 5507 | { |
36073a92 | 5508 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 2); |
cca44b1b JB |
5509 | |
5510 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5511 | if (dsc->u.ldst.xfersize > 4) | |
5512 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5513 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
5514 | if (!dsc->u.ldst.immed) | |
5515 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
5516 | if (!dsc->u.ldst.restore_r4) | |
5517 | displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC); | |
5518 | ||
5519 | /* Writeback. */ | |
5520 | if (dsc->u.ldst.writeback) | |
5521 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
5522 | } | |
5523 | ||
5524 | /* Copy "extra" load/store instructions. These are halfword/doubleword | |
5525 | transfers, which have a different encoding to byte/word transfers. */ | |
5526 | ||
5527 | static int | |
550dc4e2 | 5528 | arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unprivileged, |
cfba9872 | 5529 | struct regcache *regs, arm_displaced_step_closure *dsc) |
cca44b1b JB |
5530 | { |
5531 | unsigned int op1 = bits (insn, 20, 24); | |
5532 | unsigned int op2 = bits (insn, 5, 6); | |
5533 | unsigned int rt = bits (insn, 12, 15); | |
5534 | unsigned int rn = bits (insn, 16, 19); | |
5535 | unsigned int rm = bits (insn, 0, 3); | |
5536 | char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1}; | |
5537 | char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2}; | |
5538 | int immed = (op1 & 0x4) != 0; | |
5539 | int opcode; | |
5540 | ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0; | |
cca44b1b JB |
5541 | |
5542 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
7ff120b4 | 5543 | return arm_copy_unmodified (gdbarch, insn, "extra load/store", dsc); |
cca44b1b JB |
5544 | |
5545 | if (debug_displaced) | |
5546 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store " | |
550dc4e2 | 5547 | "insn %.8lx\n", unprivileged ? "unprivileged " : "", |
cca44b1b JB |
5548 | (unsigned long) insn); |
5549 | ||
5550 | opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4; | |
5551 | ||
5552 | if (opcode < 0) | |
5553 | internal_error (__FILE__, __LINE__, | |
5554 | _("copy_extra_ld_st: instruction decode error")); | |
5555 | ||
36073a92 YQ |
5556 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5557 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5558 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 5559 | if (!immed) |
36073a92 | 5560 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 5561 | |
36073a92 | 5562 | rt_val = displaced_read_reg (regs, dsc, rt); |
cca44b1b | 5563 | if (bytesize[opcode] == 8) |
36073a92 YQ |
5564 | rt_val2 = displaced_read_reg (regs, dsc, rt + 1); |
5565 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5566 | if (!immed) |
36073a92 | 5567 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
5568 | |
5569 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
5570 | if (bytesize[opcode] == 8) | |
5571 | displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC); | |
5572 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
5573 | if (!immed) | |
5574 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
5575 | ||
5576 | dsc->rd = rt; | |
5577 | dsc->u.ldst.xfersize = bytesize[opcode]; | |
5578 | dsc->u.ldst.rn = rn; | |
5579 | dsc->u.ldst.immed = immed; | |
5580 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; | |
5581 | dsc->u.ldst.restore_r4 = 0; | |
5582 | ||
5583 | if (immed) | |
5584 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm] | |
5585 | -> | |
5586 | {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */ | |
5587 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
5588 | else | |
5589 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm] | |
5590 | -> | |
5591 | {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */ | |
5592 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
5593 | ||
5594 | dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store; | |
5595 | ||
5596 | return 0; | |
5597 | } | |
5598 | ||
0f6f04ba | 5599 | /* Copy byte/half word/word loads and stores. */ |
cca44b1b | 5600 | |
7ff120b4 | 5601 | static void |
0f6f04ba | 5602 | install_load_store (struct gdbarch *gdbarch, struct regcache *regs, |
cfba9872 | 5603 | arm_displaced_step_closure *dsc, int load, |
0f6f04ba YQ |
5604 | int immed, int writeback, int size, int usermode, |
5605 | int rt, int rm, int rn) | |
cca44b1b | 5606 | { |
cca44b1b | 5607 | ULONGEST rt_val, rn_val, rm_val = 0; |
cca44b1b | 5608 | |
36073a92 YQ |
5609 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5610 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 5611 | if (!immed) |
36073a92 | 5612 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 5613 | if (!load) |
36073a92 | 5614 | dsc->tmp[4] = displaced_read_reg (regs, dsc, 4); |
cca44b1b | 5615 | |
36073a92 YQ |
5616 | rt_val = displaced_read_reg (regs, dsc, rt); |
5617 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5618 | if (!immed) |
36073a92 | 5619 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
5620 | |
5621 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
5622 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
5623 | if (!immed) | |
5624 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
cca44b1b | 5625 | dsc->rd = rt; |
0f6f04ba | 5626 | dsc->u.ldst.xfersize = size; |
cca44b1b JB |
5627 | dsc->u.ldst.rn = rn; |
5628 | dsc->u.ldst.immed = immed; | |
7ff120b4 | 5629 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
5630 | |
5631 | /* To write PC we can do: | |
5632 | ||
494e194e YQ |
5633 | Before this sequence of instructions: |
5634 | r0 is the PC value got from displaced_read_reg, so r0 = from + 8; | |
85102364 | 5635 | r2 is the Rn value got from displaced_read_reg. |
494e194e YQ |
5636 | |
5637 | Insn1: push {pc} Write address of STR instruction + offset on stack | |
5638 | Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset | |
5639 | Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc | |
5640 | = addr(Insn1) + offset - addr(Insn3) - 8 | |
5641 | = offset - 16 | |
5642 | Insn4: add r4, r4, #8 r4 = offset - 8 | |
5643 | Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8 | |
5644 | = from + offset | |
5645 | Insn6: str r0, [r2, #imm] (or str r0, [r2, r3]) | |
cca44b1b JB |
5646 | |
5647 | Otherwise we don't know what value to write for PC, since the offset is | |
494e194e YQ |
5648 | architecture-dependent (sometimes PC+8, sometimes PC+12). More details |
5649 | of this can be found in Section "Saving from r15" in | |
5650 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */ | |
cca44b1b | 5651 | |
7ff120b4 YQ |
5652 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; |
5653 | } | |
5654 | ||
34518530 YQ |
5655 | |
5656 | static int | |
5657 | thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1, | |
5658 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 5659 | arm_displaced_step_closure *dsc, int size) |
34518530 YQ |
5660 | { |
5661 | unsigned int u_bit = bit (insn1, 7); | |
5662 | unsigned int rt = bits (insn2, 12, 15); | |
5663 | int imm12 = bits (insn2, 0, 11); | |
5664 | ULONGEST pc_val; | |
5665 | ||
5666 | if (debug_displaced) | |
5667 | fprintf_unfiltered (gdb_stdlog, | |
5668 | "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n", | |
5669 | (unsigned int) dsc->insn_addr, rt, u_bit ? '+' : '-', | |
5670 | imm12); | |
5671 | ||
5672 | if (!u_bit) | |
5673 | imm12 = -1 * imm12; | |
5674 | ||
5675 | /* Rewrite instruction LDR Rt imm12 into: | |
5676 | ||
5677 | Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12 | |
5678 | ||
5679 | LDR R0, R2, R3, | |
5680 | ||
5681 | Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */ | |
5682 | ||
5683 | ||
5684 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
5685 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
5686 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
5687 | ||
5688 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
5689 | ||
5690 | pc_val = pc_val & 0xfffffffc; | |
5691 | ||
5692 | displaced_write_reg (regs, dsc, 2, pc_val, CANNOT_WRITE_PC); | |
5693 | displaced_write_reg (regs, dsc, 3, imm12, CANNOT_WRITE_PC); | |
5694 | ||
5695 | dsc->rd = rt; | |
5696 | ||
5697 | dsc->u.ldst.xfersize = size; | |
5698 | dsc->u.ldst.immed = 0; | |
5699 | dsc->u.ldst.writeback = 0; | |
5700 | dsc->u.ldst.restore_r4 = 0; | |
5701 | ||
5702 | /* LDR R0, R2, R3 */ | |
5703 | dsc->modinsn[0] = 0xf852; | |
5704 | dsc->modinsn[1] = 0x3; | |
5705 | dsc->numinsns = 2; | |
5706 | ||
5707 | dsc->cleanup = &cleanup_load; | |
5708 | ||
5709 | return 0; | |
5710 | } | |
5711 | ||
5712 | static int | |
5713 | thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
5714 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 5715 | arm_displaced_step_closure *dsc, |
34518530 YQ |
5716 | int writeback, int immed) |
5717 | { | |
5718 | unsigned int rt = bits (insn2, 12, 15); | |
5719 | unsigned int rn = bits (insn1, 0, 3); | |
5720 | unsigned int rm = bits (insn2, 0, 3); /* Only valid if !immed. */ | |
5721 | /* In LDR (register), there is also a register Rm, which is not allowed to | |
5722 | be PC, so we don't have to check it. */ | |
5723 | ||
5724 | if (rt != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
5725 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "load", | |
5726 | dsc); | |
5727 | ||
5728 | if (debug_displaced) | |
5729 | fprintf_unfiltered (gdb_stdlog, | |
5730 | "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n", | |
5731 | rt, rn, insn1, insn2); | |
5732 | ||
5733 | install_load_store (gdbarch, regs, dsc, 1, immed, writeback, 4, | |
5734 | 0, rt, rm, rn); | |
5735 | ||
5736 | dsc->u.ldst.restore_r4 = 0; | |
5737 | ||
5738 | if (immed) | |
5739 | /* ldr[b]<cond> rt, [rn, #imm], etc. | |
5740 | -> | |
5741 | ldr[b]<cond> r0, [r2, #imm]. */ | |
5742 | { | |
5743 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
5744 | dsc->modinsn[1] = insn2 & 0x0fff; | |
5745 | } | |
5746 | else | |
5747 | /* ldr[b]<cond> rt, [rn, rm], etc. | |
5748 | -> | |
5749 | ldr[b]<cond> r0, [r2, r3]. */ | |
5750 | { | |
5751 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
5752 | dsc->modinsn[1] = (insn2 & 0x0ff0) | 0x3; | |
5753 | } | |
5754 | ||
5755 | dsc->numinsns = 2; | |
5756 | ||
5757 | return 0; | |
5758 | } | |
5759 | ||
5760 | ||
7ff120b4 YQ |
5761 | static int |
5762 | arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn, | |
5763 | struct regcache *regs, | |
cfba9872 | 5764 | arm_displaced_step_closure *dsc, |
0f6f04ba | 5765 | int load, int size, int usermode) |
7ff120b4 YQ |
5766 | { |
5767 | int immed = !bit (insn, 25); | |
5768 | int writeback = (bit (insn, 24) == 0 || bit (insn, 21) != 0); | |
5769 | unsigned int rt = bits (insn, 12, 15); | |
5770 | unsigned int rn = bits (insn, 16, 19); | |
5771 | unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */ | |
5772 | ||
5773 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
5774 | return arm_copy_unmodified (gdbarch, insn, "load/store", dsc); | |
5775 | ||
5776 | if (debug_displaced) | |
5777 | fprintf_unfiltered (gdb_stdlog, | |
5778 | "displaced: copying %s%s r%d [r%d] insn %.8lx\n", | |
0f6f04ba YQ |
5779 | load ? (size == 1 ? "ldrb" : "ldr") |
5780 | : (size == 1 ? "strb" : "str"), usermode ? "t" : "", | |
7ff120b4 YQ |
5781 | rt, rn, |
5782 | (unsigned long) insn); | |
5783 | ||
0f6f04ba YQ |
5784 | install_load_store (gdbarch, regs, dsc, load, immed, writeback, size, |
5785 | usermode, rt, rm, rn); | |
7ff120b4 | 5786 | |
bf9f652a | 5787 | if (load || rt != ARM_PC_REGNUM) |
cca44b1b JB |
5788 | { |
5789 | dsc->u.ldst.restore_r4 = 0; | |
5790 | ||
5791 | if (immed) | |
5792 | /* {ldr,str}[b]<cond> rt, [rn, #imm], etc. | |
5793 | -> | |
5794 | {ldr,str}[b]<cond> r0, [r2, #imm]. */ | |
5795 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
5796 | else | |
5797 | /* {ldr,str}[b]<cond> rt, [rn, rm], etc. | |
5798 | -> | |
5799 | {ldr,str}[b]<cond> r0, [r2, r3]. */ | |
5800 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
5801 | } | |
5802 | else | |
5803 | { | |
5804 | /* We need to use r4 as scratch. Make sure it's restored afterwards. */ | |
5805 | dsc->u.ldst.restore_r4 = 1; | |
494e194e YQ |
5806 | dsc->modinsn[0] = 0xe92d8000; /* push {pc} */ |
5807 | dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */ | |
cca44b1b JB |
5808 | dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */ |
5809 | dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */ | |
5810 | dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */ | |
5811 | ||
5812 | /* As above. */ | |
5813 | if (immed) | |
5814 | dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000; | |
5815 | else | |
5816 | dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003; | |
5817 | ||
cca44b1b JB |
5818 | dsc->numinsns = 6; |
5819 | } | |
5820 | ||
5821 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; | |
5822 | ||
5823 | return 0; | |
5824 | } | |
5825 | ||
5826 | /* Cleanup LDM instructions with fully-populated register list. This is an | |
5827 | unfortunate corner case: it's impossible to implement correctly by modifying | |
5828 | the instruction. The issue is as follows: we have an instruction, | |
5829 | ||
5830 | ldm rN, {r0-r15} | |
5831 | ||
5832 | which we must rewrite to avoid loading PC. A possible solution would be to | |
5833 | do the load in two halves, something like (with suitable cleanup | |
5834 | afterwards): | |
5835 | ||
5836 | mov r8, rN | |
5837 | ldm[id][ab] r8!, {r0-r7} | |
5838 | str r7, <temp> | |
5839 | ldm[id][ab] r8, {r7-r14} | |
5840 | <bkpt> | |
5841 | ||
5842 | but at present there's no suitable place for <temp>, since the scratch space | |
5843 | is overwritten before the cleanup routine is called. For now, we simply | |
5844 | emulate the instruction. */ | |
5845 | ||
5846 | static void | |
5847 | cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 5848 | arm_displaced_step_closure *dsc) |
cca44b1b | 5849 | { |
cca44b1b JB |
5850 | int inc = dsc->u.block.increment; |
5851 | int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0; | |
5852 | int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4); | |
5853 | uint32_t regmask = dsc->u.block.regmask; | |
5854 | int regno = inc ? 0 : 15; | |
5855 | CORE_ADDR xfer_addr = dsc->u.block.xfer_addr; | |
5856 | int exception_return = dsc->u.block.load && dsc->u.block.user | |
5857 | && (regmask & 0x8000) != 0; | |
36073a92 | 5858 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
5859 | int do_transfer = condition_true (dsc->u.block.cond, status); |
5860 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
5861 | ||
5862 | if (!do_transfer) | |
5863 | return; | |
5864 | ||
5865 | /* If the instruction is ldm rN, {...pc}^, I don't think there's anything | |
5866 | sensible we can do here. Complain loudly. */ | |
5867 | if (exception_return) | |
5868 | error (_("Cannot single-step exception return")); | |
5869 | ||
5870 | /* We don't handle any stores here for now. */ | |
5871 | gdb_assert (dsc->u.block.load != 0); | |
5872 | ||
5873 | if (debug_displaced) | |
5874 | fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: " | |
5875 | "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm", | |
5876 | dsc->u.block.increment ? "inc" : "dec", | |
5877 | dsc->u.block.before ? "before" : "after"); | |
5878 | ||
5879 | while (regmask) | |
5880 | { | |
5881 | uint32_t memword; | |
5882 | ||
5883 | if (inc) | |
bf9f652a | 5884 | while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0) |
cca44b1b JB |
5885 | regno++; |
5886 | else | |
5887 | while (regno >= 0 && (regmask & (1 << regno)) == 0) | |
5888 | regno--; | |
5889 | ||
5890 | xfer_addr += bump_before; | |
5891 | ||
5892 | memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order); | |
5893 | displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC); | |
5894 | ||
5895 | xfer_addr += bump_after; | |
5896 | ||
5897 | regmask &= ~(1 << regno); | |
5898 | } | |
5899 | ||
5900 | if (dsc->u.block.writeback) | |
5901 | displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr, | |
5902 | CANNOT_WRITE_PC); | |
5903 | } | |
5904 | ||
5905 | /* Clean up an STM which included the PC in the register list. */ | |
5906 | ||
5907 | static void | |
5908 | cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 5909 | arm_displaced_step_closure *dsc) |
cca44b1b | 5910 | { |
36073a92 | 5911 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b | 5912 | int store_executed = condition_true (dsc->u.block.cond, status); |
5f661e03 SM |
5913 | CORE_ADDR pc_stored_at, transferred_regs |
5914 | = count_one_bits (dsc->u.block.regmask); | |
cca44b1b JB |
5915 | CORE_ADDR stm_insn_addr; |
5916 | uint32_t pc_val; | |
5917 | long offset; | |
5918 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
5919 | ||
5920 | /* If condition code fails, there's nothing else to do. */ | |
5921 | if (!store_executed) | |
5922 | return; | |
5923 | ||
5924 | if (dsc->u.block.increment) | |
5925 | { | |
5926 | pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs; | |
5927 | ||
5928 | if (dsc->u.block.before) | |
5929 | pc_stored_at += 4; | |
5930 | } | |
5931 | else | |
5932 | { | |
5933 | pc_stored_at = dsc->u.block.xfer_addr; | |
5934 | ||
5935 | if (dsc->u.block.before) | |
5936 | pc_stored_at -= 4; | |
5937 | } | |
5938 | ||
5939 | pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order); | |
5940 | stm_insn_addr = dsc->scratch_base; | |
5941 | offset = pc_val - stm_insn_addr; | |
5942 | ||
5943 | if (debug_displaced) | |
5944 | fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for " | |
5945 | "STM instruction\n", offset); | |
5946 | ||
5947 | /* Rewrite the stored PC to the proper value for the non-displaced original | |
5948 | instruction. */ | |
5949 | write_memory_unsigned_integer (pc_stored_at, 4, byte_order, | |
5950 | dsc->insn_addr + offset); | |
5951 | } | |
5952 | ||
5953 | /* Clean up an LDM which includes the PC in the register list. We clumped all | |
5954 | the registers in the transferred list into a contiguous range r0...rX (to | |
5955 | avoid loading PC directly and losing control of the debugged program), so we | |
5956 | must undo that here. */ | |
5957 | ||
5958 | static void | |
6e39997a | 5959 | cleanup_block_load_pc (struct gdbarch *gdbarch, |
cca44b1b | 5960 | struct regcache *regs, |
cfba9872 | 5961 | arm_displaced_step_closure *dsc) |
cca44b1b | 5962 | { |
36073a92 | 5963 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
22e048c9 | 5964 | int load_executed = condition_true (dsc->u.block.cond, status); |
bf9f652a | 5965 | unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM; |
5f661e03 | 5966 | unsigned int regs_loaded = count_one_bits (mask); |
cca44b1b JB |
5967 | unsigned int num_to_shuffle = regs_loaded, clobbered; |
5968 | ||
5969 | /* The method employed here will fail if the register list is fully populated | |
5970 | (we need to avoid loading PC directly). */ | |
5971 | gdb_assert (num_to_shuffle < 16); | |
5972 | ||
5973 | if (!load_executed) | |
5974 | return; | |
5975 | ||
5976 | clobbered = (1 << num_to_shuffle) - 1; | |
5977 | ||
5978 | while (num_to_shuffle > 0) | |
5979 | { | |
5980 | if ((mask & (1 << write_reg)) != 0) | |
5981 | { | |
5982 | unsigned int read_reg = num_to_shuffle - 1; | |
5983 | ||
5984 | if (read_reg != write_reg) | |
5985 | { | |
36073a92 | 5986 | ULONGEST rval = displaced_read_reg (regs, dsc, read_reg); |
cca44b1b JB |
5987 | displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC); |
5988 | if (debug_displaced) | |
5989 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move " | |
5990 | "loaded register r%d to r%d\n"), read_reg, | |
5991 | write_reg); | |
5992 | } | |
5993 | else if (debug_displaced) | |
5994 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register " | |
5995 | "r%d already in the right place\n"), | |
5996 | write_reg); | |
5997 | ||
5998 | clobbered &= ~(1 << write_reg); | |
5999 | ||
6000 | num_to_shuffle--; | |
6001 | } | |
6002 | ||
6003 | write_reg--; | |
6004 | } | |
6005 | ||
6006 | /* Restore any registers we scribbled over. */ | |
6007 | for (write_reg = 0; clobbered != 0; write_reg++) | |
6008 | { | |
6009 | if ((clobbered & (1 << write_reg)) != 0) | |
6010 | { | |
6011 | displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg], | |
6012 | CANNOT_WRITE_PC); | |
6013 | if (debug_displaced) | |
6014 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored " | |
6015 | "clobbered register r%d\n"), write_reg); | |
6016 | clobbered &= ~(1 << write_reg); | |
6017 | } | |
6018 | } | |
6019 | ||
6020 | /* Perform register writeback manually. */ | |
6021 | if (dsc->u.block.writeback) | |
6022 | { | |
6023 | ULONGEST new_rn_val = dsc->u.block.xfer_addr; | |
6024 | ||
6025 | if (dsc->u.block.increment) | |
6026 | new_rn_val += regs_loaded * 4; | |
6027 | else | |
6028 | new_rn_val -= regs_loaded * 4; | |
6029 | ||
6030 | displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val, | |
6031 | CANNOT_WRITE_PC); | |
6032 | } | |
6033 | } | |
6034 | ||
6035 | /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur | |
6036 | in user-level code (in particular exception return, ldm rn, {...pc}^). */ | |
6037 | ||
6038 | static int | |
7ff120b4 YQ |
6039 | arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, |
6040 | struct regcache *regs, | |
cfba9872 | 6041 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6042 | { |
6043 | int load = bit (insn, 20); | |
6044 | int user = bit (insn, 22); | |
6045 | int increment = bit (insn, 23); | |
6046 | int before = bit (insn, 24); | |
6047 | int writeback = bit (insn, 21); | |
6048 | int rn = bits (insn, 16, 19); | |
cca44b1b | 6049 | |
0963b4bd MS |
6050 | /* Block transfers which don't mention PC can be run directly |
6051 | out-of-line. */ | |
bf9f652a | 6052 | if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0) |
7ff120b4 | 6053 | return arm_copy_unmodified (gdbarch, insn, "ldm/stm", dsc); |
cca44b1b | 6054 | |
bf9f652a | 6055 | if (rn == ARM_PC_REGNUM) |
cca44b1b | 6056 | { |
0963b4bd MS |
6057 | warning (_("displaced: Unpredictable LDM or STM with " |
6058 | "base register r15")); | |
7ff120b4 | 6059 | return arm_copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc); |
cca44b1b JB |
6060 | } |
6061 | ||
6062 | if (debug_displaced) | |
6063 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " | |
6064 | "%.8lx\n", (unsigned long) insn); | |
6065 | ||
36073a92 | 6066 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
cca44b1b JB |
6067 | dsc->u.block.rn = rn; |
6068 | ||
6069 | dsc->u.block.load = load; | |
6070 | dsc->u.block.user = user; | |
6071 | dsc->u.block.increment = increment; | |
6072 | dsc->u.block.before = before; | |
6073 | dsc->u.block.writeback = writeback; | |
6074 | dsc->u.block.cond = bits (insn, 28, 31); | |
6075 | ||
6076 | dsc->u.block.regmask = insn & 0xffff; | |
6077 | ||
6078 | if (load) | |
6079 | { | |
6080 | if ((insn & 0xffff) == 0xffff) | |
6081 | { | |
6082 | /* LDM with a fully-populated register list. This case is | |
6083 | particularly tricky. Implement for now by fully emulating the | |
6084 | instruction (which might not behave perfectly in all cases, but | |
6085 | these instructions should be rare enough for that not to matter | |
6086 | too much). */ | |
6087 | dsc->modinsn[0] = ARM_NOP; | |
6088 | ||
6089 | dsc->cleanup = &cleanup_block_load_all; | |
6090 | } | |
6091 | else | |
6092 | { | |
6093 | /* LDM of a list of registers which includes PC. Implement by | |
6094 | rewriting the list of registers to be transferred into a | |
6095 | contiguous chunk r0...rX before doing the transfer, then shuffling | |
6096 | registers into the correct places in the cleanup routine. */ | |
6097 | unsigned int regmask = insn & 0xffff; | |
5f661e03 | 6098 | unsigned int num_in_list = count_one_bits (regmask), new_regmask; |
bec2ab5a | 6099 | unsigned int i; |
cca44b1b JB |
6100 | |
6101 | for (i = 0; i < num_in_list; i++) | |
36073a92 | 6102 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b JB |
6103 | |
6104 | /* Writeback makes things complicated. We need to avoid clobbering | |
6105 | the base register with one of the registers in our modified | |
6106 | register list, but just using a different register can't work in | |
6107 | all cases, e.g.: | |
6108 | ||
6109 | ldm r14!, {r0-r13,pc} | |
6110 | ||
6111 | which would need to be rewritten as: | |
6112 | ||
6113 | ldm rN!, {r0-r14} | |
6114 | ||
6115 | but that can't work, because there's no free register for N. | |
6116 | ||
6117 | Solve this by turning off the writeback bit, and emulating | |
6118 | writeback manually in the cleanup routine. */ | |
6119 | ||
6120 | if (writeback) | |
6121 | insn &= ~(1 << 21); | |
6122 | ||
6123 | new_regmask = (1 << num_in_list) - 1; | |
6124 | ||
6125 | if (debug_displaced) | |
6126 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
6127 | "{..., pc}: original reg list %.4x, modified " | |
6128 | "list %.4x\n"), rn, writeback ? "!" : "", | |
6129 | (int) insn & 0xffff, new_regmask); | |
6130 | ||
6131 | dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff); | |
6132 | ||
6133 | dsc->cleanup = &cleanup_block_load_pc; | |
6134 | } | |
6135 | } | |
6136 | else | |
6137 | { | |
6138 | /* STM of a list of registers which includes PC. Run the instruction | |
6139 | as-is, but out of line: this will store the wrong value for the PC, | |
6140 | so we must manually fix up the memory in the cleanup routine. | |
6141 | Doing things this way has the advantage that we can auto-detect | |
6142 | the offset of the PC write (which is architecture-dependent) in | |
6143 | the cleanup routine. */ | |
6144 | dsc->modinsn[0] = insn; | |
6145 | ||
6146 | dsc->cleanup = &cleanup_block_store_pc; | |
6147 | } | |
6148 | ||
6149 | return 0; | |
6150 | } | |
6151 | ||
34518530 YQ |
6152 | static int |
6153 | thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
6154 | struct regcache *regs, | |
cfba9872 | 6155 | arm_displaced_step_closure *dsc) |
cca44b1b | 6156 | { |
34518530 YQ |
6157 | int rn = bits (insn1, 0, 3); |
6158 | int load = bit (insn1, 4); | |
6159 | int writeback = bit (insn1, 5); | |
cca44b1b | 6160 | |
34518530 YQ |
6161 | /* Block transfers which don't mention PC can be run directly |
6162 | out-of-line. */ | |
6163 | if (rn != ARM_PC_REGNUM && (insn2 & 0x8000) == 0) | |
6164 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ldm/stm", dsc); | |
7ff120b4 | 6165 | |
34518530 YQ |
6166 | if (rn == ARM_PC_REGNUM) |
6167 | { | |
6168 | warning (_("displaced: Unpredictable LDM or STM with " | |
6169 | "base register r15")); | |
6170 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6171 | "unpredictable ldm/stm", dsc); | |
6172 | } | |
cca44b1b JB |
6173 | |
6174 | if (debug_displaced) | |
34518530 YQ |
6175 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " |
6176 | "%.4x%.4x\n", insn1, insn2); | |
cca44b1b | 6177 | |
34518530 YQ |
6178 | /* Clear bit 13, since it should be always zero. */ |
6179 | dsc->u.block.regmask = (insn2 & 0xdfff); | |
6180 | dsc->u.block.rn = rn; | |
cca44b1b | 6181 | |
34518530 YQ |
6182 | dsc->u.block.load = load; |
6183 | dsc->u.block.user = 0; | |
6184 | dsc->u.block.increment = bit (insn1, 7); | |
6185 | dsc->u.block.before = bit (insn1, 8); | |
6186 | dsc->u.block.writeback = writeback; | |
6187 | dsc->u.block.cond = INST_AL; | |
6188 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6189 | |
34518530 YQ |
6190 | if (load) |
6191 | { | |
6192 | if (dsc->u.block.regmask == 0xffff) | |
6193 | { | |
6194 | /* This branch is impossible to happen. */ | |
6195 | gdb_assert (0); | |
6196 | } | |
6197 | else | |
6198 | { | |
6199 | unsigned int regmask = dsc->u.block.regmask; | |
5f661e03 | 6200 | unsigned int num_in_list = count_one_bits (regmask), new_regmask; |
bec2ab5a | 6201 | unsigned int i; |
34518530 YQ |
6202 | |
6203 | for (i = 0; i < num_in_list; i++) | |
6204 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
6205 | ||
6206 | if (writeback) | |
6207 | insn1 &= ~(1 << 5); | |
6208 | ||
6209 | new_regmask = (1 << num_in_list) - 1; | |
6210 | ||
6211 | if (debug_displaced) | |
6212 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
6213 | "{..., pc}: original reg list %.4x, modified " | |
6214 | "list %.4x\n"), rn, writeback ? "!" : "", | |
6215 | (int) dsc->u.block.regmask, new_regmask); | |
6216 | ||
6217 | dsc->modinsn[0] = insn1; | |
6218 | dsc->modinsn[1] = (new_regmask & 0xffff); | |
6219 | dsc->numinsns = 2; | |
6220 | ||
6221 | dsc->cleanup = &cleanup_block_load_pc; | |
6222 | } | |
6223 | } | |
6224 | else | |
6225 | { | |
6226 | dsc->modinsn[0] = insn1; | |
6227 | dsc->modinsn[1] = insn2; | |
6228 | dsc->numinsns = 2; | |
6229 | dsc->cleanup = &cleanup_block_store_pc; | |
6230 | } | |
6231 | return 0; | |
6232 | } | |
6233 | ||
d9311bfa AT |
6234 | /* Wrapper over read_memory_unsigned_integer for use in arm_get_next_pcs. |
6235 | This is used to avoid a dependency on BFD's bfd_endian enum. */ | |
6236 | ||
6237 | ULONGEST | |
6238 | arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr, int len, | |
6239 | int byte_order) | |
6240 | { | |
5f2dfcfd AT |
6241 | return read_memory_unsigned_integer (memaddr, len, |
6242 | (enum bfd_endian) byte_order); | |
d9311bfa AT |
6243 | } |
6244 | ||
6245 | /* Wrapper over gdbarch_addr_bits_remove for use in arm_get_next_pcs. */ | |
6246 | ||
6247 | CORE_ADDR | |
6248 | arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs *self, | |
6249 | CORE_ADDR val) | |
6250 | { | |
ac7936df | 6251 | return gdbarch_addr_bits_remove (self->regcache->arch (), val); |
d9311bfa AT |
6252 | } |
6253 | ||
6254 | /* Wrapper over syscall_next_pc for use in get_next_pcs. */ | |
6255 | ||
e7cf25a8 | 6256 | static CORE_ADDR |
553cb527 | 6257 | arm_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self) |
d9311bfa | 6258 | { |
d9311bfa AT |
6259 | return 0; |
6260 | } | |
6261 | ||
6262 | /* Wrapper over arm_is_thumb for use in arm_get_next_pcs. */ | |
6263 | ||
6264 | int | |
6265 | arm_get_next_pcs_is_thumb (struct arm_get_next_pcs *self) | |
6266 | { | |
6267 | return arm_is_thumb (self->regcache); | |
6268 | } | |
6269 | ||
6270 | /* single_step() is called just before we want to resume the inferior, | |
6271 | if we want to single-step it but there is no hardware or kernel | |
6272 | single-step support. We find the target of the coming instructions | |
6273 | and breakpoint them. */ | |
6274 | ||
a0ff9e1a | 6275 | std::vector<CORE_ADDR> |
f5ea389a | 6276 | arm_software_single_step (struct regcache *regcache) |
d9311bfa | 6277 | { |
ac7936df | 6278 | struct gdbarch *gdbarch = regcache->arch (); |
d9311bfa | 6279 | struct arm_get_next_pcs next_pcs_ctx; |
d9311bfa AT |
6280 | |
6281 | arm_get_next_pcs_ctor (&next_pcs_ctx, | |
6282 | &arm_get_next_pcs_ops, | |
6283 | gdbarch_byte_order (gdbarch), | |
6284 | gdbarch_byte_order_for_code (gdbarch), | |
1b451dda | 6285 | 0, |
d9311bfa AT |
6286 | regcache); |
6287 | ||
a0ff9e1a | 6288 | std::vector<CORE_ADDR> next_pcs = arm_get_next_pcs (&next_pcs_ctx); |
d9311bfa | 6289 | |
a0ff9e1a SM |
6290 | for (CORE_ADDR &pc_ref : next_pcs) |
6291 | pc_ref = gdbarch_addr_bits_remove (gdbarch, pc_ref); | |
d9311bfa | 6292 | |
93f9a11f | 6293 | return next_pcs; |
d9311bfa AT |
6294 | } |
6295 | ||
34518530 YQ |
6296 | /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden |
6297 | for Linux, where some SVC instructions must be treated specially. */ | |
6298 | ||
6299 | static void | |
6300 | cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 6301 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6302 | { |
6303 | CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size; | |
6304 | ||
6305 | if (debug_displaced) | |
6306 | fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at " | |
6307 | "%.8lx\n", (unsigned long) resume_addr); | |
6308 | ||
6309 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC); | |
6310 | } | |
6311 | ||
6312 | ||
85102364 | 6313 | /* Common copy routine for svc instruction. */ |
34518530 YQ |
6314 | |
6315 | static int | |
6316 | install_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 6317 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6318 | { |
6319 | /* Preparation: none. | |
6320 | Insn: unmodified svc. | |
6321 | Cleanup: pc <- insn_addr + insn_size. */ | |
6322 | ||
6323 | /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next | |
6324 | instruction. */ | |
6325 | dsc->wrote_to_pc = 1; | |
6326 | ||
6327 | /* Allow OS-specific code to override SVC handling. */ | |
bd18283a YQ |
6328 | if (dsc->u.svc.copy_svc_os) |
6329 | return dsc->u.svc.copy_svc_os (gdbarch, regs, dsc); | |
6330 | else | |
6331 | { | |
6332 | dsc->cleanup = &cleanup_svc; | |
6333 | return 0; | |
6334 | } | |
34518530 YQ |
6335 | } |
6336 | ||
6337 | static int | |
6338 | arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn, | |
cfba9872 | 6339 | struct regcache *regs, arm_displaced_step_closure *dsc) |
34518530 YQ |
6340 | { |
6341 | ||
6342 | if (debug_displaced) | |
6343 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n", | |
6344 | (unsigned long) insn); | |
6345 | ||
6346 | dsc->modinsn[0] = insn; | |
6347 | ||
6348 | return install_svc (gdbarch, regs, dsc); | |
6349 | } | |
6350 | ||
6351 | static int | |
6352 | thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn, | |
cfba9872 | 6353 | struct regcache *regs, arm_displaced_step_closure *dsc) |
34518530 YQ |
6354 | { |
6355 | ||
6356 | if (debug_displaced) | |
6357 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.4x\n", | |
6358 | insn); | |
bd18283a | 6359 | |
34518530 YQ |
6360 | dsc->modinsn[0] = insn; |
6361 | ||
6362 | return install_svc (gdbarch, regs, dsc); | |
cca44b1b JB |
6363 | } |
6364 | ||
6365 | /* Copy undefined instructions. */ | |
6366 | ||
6367 | static int | |
7ff120b4 | 6368 | arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn, |
cfba9872 | 6369 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6370 | { |
6371 | if (debug_displaced) | |
0963b4bd MS |
6372 | fprintf_unfiltered (gdb_stdlog, |
6373 | "displaced: copying undefined insn %.8lx\n", | |
cca44b1b JB |
6374 | (unsigned long) insn); |
6375 | ||
6376 | dsc->modinsn[0] = insn; | |
6377 | ||
6378 | return 0; | |
6379 | } | |
6380 | ||
34518530 YQ |
6381 | static int |
6382 | thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
cfba9872 | 6383 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6384 | { |
6385 | ||
6386 | if (debug_displaced) | |
6387 | fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn " | |
6388 | "%.4x %.4x\n", (unsigned short) insn1, | |
6389 | (unsigned short) insn2); | |
6390 | ||
6391 | dsc->modinsn[0] = insn1; | |
6392 | dsc->modinsn[1] = insn2; | |
6393 | dsc->numinsns = 2; | |
6394 | ||
6395 | return 0; | |
6396 | } | |
6397 | ||
cca44b1b JB |
6398 | /* Copy unpredictable instructions. */ |
6399 | ||
6400 | static int | |
7ff120b4 | 6401 | arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn, |
cfba9872 | 6402 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6403 | { |
6404 | if (debug_displaced) | |
6405 | fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn " | |
6406 | "%.8lx\n", (unsigned long) insn); | |
6407 | ||
6408 | dsc->modinsn[0] = insn; | |
6409 | ||
6410 | return 0; | |
6411 | } | |
6412 | ||
6413 | /* The decode_* functions are instruction decoding helpers. They mostly follow | |
6414 | the presentation in the ARM ARM. */ | |
6415 | ||
6416 | static int | |
7ff120b4 YQ |
6417 | arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn, |
6418 | struct regcache *regs, | |
cfba9872 | 6419 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6420 | { |
6421 | unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7); | |
6422 | unsigned int rn = bits (insn, 16, 19); | |
6423 | ||
2f924de6 | 6424 | if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0x1) == 0x0) |
7ff120b4 | 6425 | return arm_copy_unmodified (gdbarch, insn, "cps", dsc); |
2f924de6 | 6426 | else if (op1 == 0x10 && op2 == 0x0 && (rn & 0x1) == 0x1) |
7ff120b4 | 6427 | return arm_copy_unmodified (gdbarch, insn, "setend", dsc); |
cca44b1b | 6428 | else if ((op1 & 0x60) == 0x20) |
7ff120b4 | 6429 | return arm_copy_unmodified (gdbarch, insn, "neon dataproc", dsc); |
cca44b1b | 6430 | else if ((op1 & 0x71) == 0x40) |
7ff120b4 YQ |
6431 | return arm_copy_unmodified (gdbarch, insn, "neon elt/struct load/store", |
6432 | dsc); | |
cca44b1b | 6433 | else if ((op1 & 0x77) == 0x41) |
7ff120b4 | 6434 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 6435 | else if ((op1 & 0x77) == 0x45) |
7ff120b4 | 6436 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pli. */ |
cca44b1b JB |
6437 | else if ((op1 & 0x77) == 0x51) |
6438 | { | |
6439 | if (rn != 0xf) | |
7ff120b4 | 6440 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b | 6441 | else |
7ff120b4 | 6442 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
6443 | } |
6444 | else if ((op1 & 0x77) == 0x55) | |
7ff120b4 | 6445 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b JB |
6446 | else if (op1 == 0x57) |
6447 | switch (op2) | |
6448 | { | |
7ff120b4 YQ |
6449 | case 0x1: return arm_copy_unmodified (gdbarch, insn, "clrex", dsc); |
6450 | case 0x4: return arm_copy_unmodified (gdbarch, insn, "dsb", dsc); | |
6451 | case 0x5: return arm_copy_unmodified (gdbarch, insn, "dmb", dsc); | |
6452 | case 0x6: return arm_copy_unmodified (gdbarch, insn, "isb", dsc); | |
6453 | default: return arm_copy_unpred (gdbarch, insn, dsc); | |
cca44b1b JB |
6454 | } |
6455 | else if ((op1 & 0x63) == 0x43) | |
7ff120b4 | 6456 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
6457 | else if ((op2 & 0x1) == 0x0) |
6458 | switch (op1 & ~0x80) | |
6459 | { | |
6460 | case 0x61: | |
7ff120b4 | 6461 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 6462 | case 0x65: |
7ff120b4 | 6463 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */ |
cca44b1b JB |
6464 | case 0x71: case 0x75: |
6465 | /* pld/pldw reg. */ | |
7ff120b4 | 6466 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 6467 | case 0x63: case 0x67: case 0x73: case 0x77: |
7ff120b4 | 6468 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b | 6469 | default: |
7ff120b4 | 6470 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6471 | } |
6472 | else | |
7ff120b4 | 6473 | return arm_copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */ |
cca44b1b JB |
6474 | } |
6475 | ||
6476 | static int | |
7ff120b4 YQ |
6477 | arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn, |
6478 | struct regcache *regs, | |
cfba9872 | 6479 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6480 | { |
6481 | if (bit (insn, 27) == 0) | |
7ff120b4 | 6482 | return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6483 | /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */ |
6484 | else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20)) | |
6485 | { | |
6486 | case 0x0: case 0x2: | |
7ff120b4 | 6487 | return arm_copy_unmodified (gdbarch, insn, "srs", dsc); |
cca44b1b JB |
6488 | |
6489 | case 0x1: case 0x3: | |
7ff120b4 | 6490 | return arm_copy_unmodified (gdbarch, insn, "rfe", dsc); |
cca44b1b JB |
6491 | |
6492 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7ff120b4 | 6493 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6494 | |
6495 | case 0x8: | |
6496 | switch ((insn & 0xe00000) >> 21) | |
6497 | { | |
6498 | case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7: | |
6499 | /* stc/stc2. */ | |
7ff120b4 | 6500 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6501 | |
6502 | case 0x2: | |
7ff120b4 | 6503 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b JB |
6504 | |
6505 | default: | |
7ff120b4 | 6506 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6507 | } |
6508 | ||
6509 | case 0x9: | |
6510 | { | |
6511 | int rn_f = (bits (insn, 16, 19) == 0xf); | |
6512 | switch ((insn & 0xe00000) >> 21) | |
6513 | { | |
6514 | case 0x1: case 0x3: | |
6515 | /* ldc/ldc2 imm (undefined for rn == pc). */ | |
7ff120b4 YQ |
6516 | return rn_f ? arm_copy_undef (gdbarch, insn, dsc) |
6517 | : arm_copy_copro_load_store (gdbarch, insn, regs, dsc); | |
cca44b1b JB |
6518 | |
6519 | case 0x2: | |
7ff120b4 | 6520 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
6521 | |
6522 | case 0x4: case 0x5: case 0x6: case 0x7: | |
6523 | /* ldc/ldc2 lit (undefined for rn != pc). */ | |
7ff120b4 YQ |
6524 | return rn_f ? arm_copy_copro_load_store (gdbarch, insn, regs, dsc) |
6525 | : arm_copy_undef (gdbarch, insn, dsc); | |
cca44b1b JB |
6526 | |
6527 | default: | |
7ff120b4 | 6528 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6529 | } |
6530 | } | |
6531 | ||
6532 | case 0xa: | |
7ff120b4 | 6533 | return arm_copy_unmodified (gdbarch, insn, "stc/stc2", dsc); |
cca44b1b JB |
6534 | |
6535 | case 0xb: | |
6536 | if (bits (insn, 16, 19) == 0xf) | |
6537 | /* ldc/ldc2 lit. */ | |
7ff120b4 | 6538 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 6539 | else |
7ff120b4 | 6540 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6541 | |
6542 | case 0xc: | |
6543 | if (bit (insn, 4)) | |
7ff120b4 | 6544 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 6545 | else |
7ff120b4 | 6546 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
6547 | |
6548 | case 0xd: | |
6549 | if (bit (insn, 4)) | |
7ff120b4 | 6550 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 6551 | else |
7ff120b4 | 6552 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
6553 | |
6554 | default: | |
7ff120b4 | 6555 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6556 | } |
6557 | } | |
6558 | ||
6559 | /* Decode miscellaneous instructions in dp/misc encoding space. */ | |
6560 | ||
6561 | static int | |
7ff120b4 YQ |
6562 | arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn, |
6563 | struct regcache *regs, | |
cfba9872 | 6564 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6565 | { |
6566 | unsigned int op2 = bits (insn, 4, 6); | |
6567 | unsigned int op = bits (insn, 21, 22); | |
cca44b1b JB |
6568 | |
6569 | switch (op2) | |
6570 | { | |
6571 | case 0x0: | |
7ff120b4 | 6572 | return arm_copy_unmodified (gdbarch, insn, "mrs/msr", dsc); |
cca44b1b JB |
6573 | |
6574 | case 0x1: | |
6575 | if (op == 0x1) /* bx. */ | |
7ff120b4 | 6576 | return arm_copy_bx_blx_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 6577 | else if (op == 0x3) |
7ff120b4 | 6578 | return arm_copy_unmodified (gdbarch, insn, "clz", dsc); |
cca44b1b | 6579 | else |
7ff120b4 | 6580 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6581 | |
6582 | case 0x2: | |
6583 | if (op == 0x1) | |
6584 | /* Not really supported. */ | |
7ff120b4 | 6585 | return arm_copy_unmodified (gdbarch, insn, "bxj", dsc); |
cca44b1b | 6586 | else |
7ff120b4 | 6587 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6588 | |
6589 | case 0x3: | |
6590 | if (op == 0x1) | |
7ff120b4 | 6591 | return arm_copy_bx_blx_reg (gdbarch, insn, |
0963b4bd | 6592 | regs, dsc); /* blx register. */ |
cca44b1b | 6593 | else |
7ff120b4 | 6594 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6595 | |
6596 | case 0x5: | |
7ff120b4 | 6597 | return arm_copy_unmodified (gdbarch, insn, "saturating add/sub", dsc); |
cca44b1b JB |
6598 | |
6599 | case 0x7: | |
6600 | if (op == 0x1) | |
7ff120b4 | 6601 | return arm_copy_unmodified (gdbarch, insn, "bkpt", dsc); |
cca44b1b JB |
6602 | else if (op == 0x3) |
6603 | /* Not really supported. */ | |
7ff120b4 | 6604 | return arm_copy_unmodified (gdbarch, insn, "smc", dsc); |
86a73007 | 6605 | /* Fall through. */ |
cca44b1b JB |
6606 | |
6607 | default: | |
7ff120b4 | 6608 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6609 | } |
6610 | } | |
6611 | ||
6612 | static int | |
7ff120b4 YQ |
6613 | arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, |
6614 | struct regcache *regs, | |
cfba9872 | 6615 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6616 | { |
6617 | if (bit (insn, 25)) | |
6618 | switch (bits (insn, 20, 24)) | |
6619 | { | |
6620 | case 0x10: | |
7ff120b4 | 6621 | return arm_copy_unmodified (gdbarch, insn, "movw", dsc); |
cca44b1b JB |
6622 | |
6623 | case 0x14: | |
7ff120b4 | 6624 | return arm_copy_unmodified (gdbarch, insn, "movt", dsc); |
cca44b1b JB |
6625 | |
6626 | case 0x12: case 0x16: | |
7ff120b4 | 6627 | return arm_copy_unmodified (gdbarch, insn, "msr imm", dsc); |
cca44b1b JB |
6628 | |
6629 | default: | |
7ff120b4 | 6630 | return arm_copy_alu_imm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6631 | } |
6632 | else | |
6633 | { | |
6634 | uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7); | |
6635 | ||
6636 | if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0) | |
7ff120b4 | 6637 | return arm_copy_alu_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 6638 | else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1) |
7ff120b4 | 6639 | return arm_copy_alu_shifted_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 6640 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0) |
7ff120b4 | 6641 | return arm_decode_miscellaneous (gdbarch, insn, regs, dsc); |
cca44b1b | 6642 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8) |
7ff120b4 | 6643 | return arm_copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc); |
cca44b1b | 6644 | else if ((op1 & 0x10) == 0x00 && op2 == 0x9) |
7ff120b4 | 6645 | return arm_copy_unmodified (gdbarch, insn, "mul/mla", dsc); |
cca44b1b | 6646 | else if ((op1 & 0x10) == 0x10 && op2 == 0x9) |
7ff120b4 | 6647 | return arm_copy_unmodified (gdbarch, insn, "synch", dsc); |
cca44b1b | 6648 | else if (op2 == 0xb || (op2 & 0xd) == 0xd) |
550dc4e2 | 6649 | /* 2nd arg means "unprivileged". */ |
7ff120b4 YQ |
6650 | return arm_copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs, |
6651 | dsc); | |
cca44b1b JB |
6652 | } |
6653 | ||
6654 | /* Should be unreachable. */ | |
6655 | return 1; | |
6656 | } | |
6657 | ||
6658 | static int | |
7ff120b4 YQ |
6659 | arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn, |
6660 | struct regcache *regs, | |
cfba9872 | 6661 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6662 | { |
6663 | int a = bit (insn, 25), b = bit (insn, 4); | |
6664 | uint32_t op1 = bits (insn, 20, 24); | |
cca44b1b JB |
6665 | |
6666 | if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02) | |
6667 | || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b)) | |
0f6f04ba | 6668 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 0); |
cca44b1b JB |
6669 | else if ((!a && (op1 & 0x17) == 0x02) |
6670 | || (a && (op1 & 0x17) == 0x02 && !b)) | |
0f6f04ba | 6671 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 1); |
cca44b1b JB |
6672 | else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03) |
6673 | || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b)) | |
0f6f04ba | 6674 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 0); |
cca44b1b JB |
6675 | else if ((!a && (op1 & 0x17) == 0x03) |
6676 | || (a && (op1 & 0x17) == 0x03 && !b)) | |
0f6f04ba | 6677 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 1); |
cca44b1b JB |
6678 | else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06) |
6679 | || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b)) | |
7ff120b4 | 6680 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0); |
cca44b1b JB |
6681 | else if ((!a && (op1 & 0x17) == 0x06) |
6682 | || (a && (op1 & 0x17) == 0x06 && !b)) | |
7ff120b4 | 6683 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1); |
cca44b1b JB |
6684 | else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07) |
6685 | || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b)) | |
7ff120b4 | 6686 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0); |
cca44b1b JB |
6687 | else if ((!a && (op1 & 0x17) == 0x07) |
6688 | || (a && (op1 & 0x17) == 0x07 && !b)) | |
7ff120b4 | 6689 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1); |
cca44b1b JB |
6690 | |
6691 | /* Should be unreachable. */ | |
6692 | return 1; | |
6693 | } | |
6694 | ||
6695 | static int | |
7ff120b4 | 6696 | arm_decode_media (struct gdbarch *gdbarch, uint32_t insn, |
cfba9872 | 6697 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6698 | { |
6699 | switch (bits (insn, 20, 24)) | |
6700 | { | |
6701 | case 0x00: case 0x01: case 0x02: case 0x03: | |
7ff120b4 | 6702 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc); |
cca44b1b JB |
6703 | |
6704 | case 0x04: case 0x05: case 0x06: case 0x07: | |
7ff120b4 | 6705 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc); |
cca44b1b JB |
6706 | |
6707 | case 0x08: case 0x09: case 0x0a: case 0x0b: | |
6708 | case 0x0c: case 0x0d: case 0x0e: case 0x0f: | |
7ff120b4 | 6709 | return arm_copy_unmodified (gdbarch, insn, |
cca44b1b JB |
6710 | "decode/pack/unpack/saturate/reverse", dsc); |
6711 | ||
6712 | case 0x18: | |
6713 | if (bits (insn, 5, 7) == 0) /* op2. */ | |
6714 | { | |
6715 | if (bits (insn, 12, 15) == 0xf) | |
7ff120b4 | 6716 | return arm_copy_unmodified (gdbarch, insn, "usad8", dsc); |
cca44b1b | 6717 | else |
7ff120b4 | 6718 | return arm_copy_unmodified (gdbarch, insn, "usada8", dsc); |
cca44b1b JB |
6719 | } |
6720 | else | |
7ff120b4 | 6721 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6722 | |
6723 | case 0x1a: case 0x1b: | |
6724 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 6725 | return arm_copy_unmodified (gdbarch, insn, "sbfx", dsc); |
cca44b1b | 6726 | else |
7ff120b4 | 6727 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6728 | |
6729 | case 0x1c: case 0x1d: | |
6730 | if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */ | |
6731 | { | |
6732 | if (bits (insn, 0, 3) == 0xf) | |
7ff120b4 | 6733 | return arm_copy_unmodified (gdbarch, insn, "bfc", dsc); |
cca44b1b | 6734 | else |
7ff120b4 | 6735 | return arm_copy_unmodified (gdbarch, insn, "bfi", dsc); |
cca44b1b JB |
6736 | } |
6737 | else | |
7ff120b4 | 6738 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6739 | |
6740 | case 0x1e: case 0x1f: | |
6741 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 6742 | return arm_copy_unmodified (gdbarch, insn, "ubfx", dsc); |
cca44b1b | 6743 | else |
7ff120b4 | 6744 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
6745 | } |
6746 | ||
6747 | /* Should be unreachable. */ | |
6748 | return 1; | |
6749 | } | |
6750 | ||
6751 | static int | |
615234c1 | 6752 | arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, uint32_t insn, |
7ff120b4 | 6753 | struct regcache *regs, |
cfba9872 | 6754 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6755 | { |
6756 | if (bit (insn, 25)) | |
7ff120b4 | 6757 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b | 6758 | else |
7ff120b4 | 6759 | return arm_copy_block_xfer (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6760 | } |
6761 | ||
6762 | static int | |
7ff120b4 YQ |
6763 | arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn, |
6764 | struct regcache *regs, | |
cfba9872 | 6765 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
6766 | { |
6767 | unsigned int opcode = bits (insn, 20, 24); | |
6768 | ||
6769 | switch (opcode) | |
6770 | { | |
6771 | case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */ | |
7ff120b4 | 6772 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc); |
cca44b1b JB |
6773 | |
6774 | case 0x08: case 0x0a: case 0x0c: case 0x0e: | |
6775 | case 0x12: case 0x16: | |
7ff120b4 | 6776 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc); |
cca44b1b JB |
6777 | |
6778 | case 0x09: case 0x0b: case 0x0d: case 0x0f: | |
6779 | case 0x13: case 0x17: | |
7ff120b4 | 6780 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc); |
cca44b1b JB |
6781 | |
6782 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
6783 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
6784 | /* Note: no writeback for these instructions. Bit 25 will always be | |
6785 | zero though (via caller), so the following works OK. */ | |
7ff120b4 | 6786 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6787 | } |
6788 | ||
6789 | /* Should be unreachable. */ | |
6790 | return 1; | |
6791 | } | |
6792 | ||
34518530 YQ |
6793 | /* Decode shifted register instructions. */ |
6794 | ||
6795 | static int | |
6796 | thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1, | |
6797 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 6798 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6799 | { |
6800 | /* PC is only allowed to be used in instruction MOV. */ | |
6801 | ||
6802 | unsigned int op = bits (insn1, 5, 8); | |
6803 | unsigned int rn = bits (insn1, 0, 3); | |
6804 | ||
6805 | if (op == 0x2 && rn == 0xf) /* MOV */ | |
6806 | return thumb2_copy_alu_imm (gdbarch, insn1, insn2, regs, dsc); | |
6807 | else | |
6808 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6809 | "dp (shift reg)", dsc); | |
6810 | } | |
6811 | ||
6812 | ||
6813 | /* Decode extension register load/store. Exactly the same as | |
6814 | arm_decode_ext_reg_ld_st. */ | |
6815 | ||
6816 | static int | |
6817 | thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1, | |
6818 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 6819 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6820 | { |
6821 | unsigned int opcode = bits (insn1, 4, 8); | |
6822 | ||
6823 | switch (opcode) | |
6824 | { | |
6825 | case 0x04: case 0x05: | |
6826 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6827 | "vfp/neon vmov", dsc); | |
6828 | ||
6829 | case 0x08: case 0x0c: /* 01x00 */ | |
6830 | case 0x0a: case 0x0e: /* 01x10 */ | |
6831 | case 0x12: case 0x16: /* 10x10 */ | |
6832 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6833 | "vfp/neon vstm/vpush", dsc); | |
6834 | ||
6835 | case 0x09: case 0x0d: /* 01x01 */ | |
6836 | case 0x0b: case 0x0f: /* 01x11 */ | |
6837 | case 0x13: case 0x17: /* 10x11 */ | |
6838 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6839 | "vfp/neon vldm/vpop", dsc); | |
6840 | ||
6841 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
6842 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6843 | "vstr", dsc); | |
6844 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
6845 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, regs, dsc); | |
6846 | } | |
6847 | ||
6848 | /* Should be unreachable. */ | |
6849 | return 1; | |
6850 | } | |
6851 | ||
cca44b1b | 6852 | static int |
12545665 | 6853 | arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, |
cfba9872 | 6854 | struct regcache *regs, arm_displaced_step_closure *dsc) |
cca44b1b JB |
6855 | { |
6856 | unsigned int op1 = bits (insn, 20, 25); | |
6857 | int op = bit (insn, 4); | |
6858 | unsigned int coproc = bits (insn, 8, 11); | |
cca44b1b JB |
6859 | |
6860 | if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa) | |
7ff120b4 | 6861 | return arm_decode_ext_reg_ld_st (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6862 | else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00 |
6863 | && (coproc & 0xe) != 0xa) | |
6864 | /* stc/stc2. */ | |
7ff120b4 | 6865 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
6866 | else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00 |
6867 | && (coproc & 0xe) != 0xa) | |
6868 | /* ldc/ldc2 imm/lit. */ | |
7ff120b4 | 6869 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 6870 | else if ((op1 & 0x3e) == 0x00) |
7ff120b4 | 6871 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b | 6872 | else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa) |
7ff120b4 | 6873 | return arm_copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc); |
cca44b1b | 6874 | else if (op1 == 0x04 && (coproc & 0xe) != 0xa) |
7ff120b4 | 6875 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b | 6876 | else if (op1 == 0x05 && (coproc & 0xe) != 0xa) |
7ff120b4 | 6877 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
6878 | else if ((op1 & 0x30) == 0x20 && !op) |
6879 | { | |
6880 | if ((coproc & 0xe) == 0xa) | |
7ff120b4 | 6881 | return arm_copy_unmodified (gdbarch, insn, "vfp dataproc", dsc); |
cca44b1b | 6882 | else |
7ff120b4 | 6883 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
6884 | } |
6885 | else if ((op1 & 0x30) == 0x20 && op) | |
7ff120b4 | 6886 | return arm_copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc); |
cca44b1b | 6887 | else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 6888 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 6889 | else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 6890 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 6891 | else if ((op1 & 0x30) == 0x30) |
7ff120b4 | 6892 | return arm_copy_svc (gdbarch, insn, regs, dsc); |
cca44b1b | 6893 | else |
7ff120b4 | 6894 | return arm_copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */ |
cca44b1b JB |
6895 | } |
6896 | ||
34518530 YQ |
6897 | static int |
6898 | thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1, | |
6899 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 6900 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6901 | { |
6902 | unsigned int coproc = bits (insn2, 8, 11); | |
34518530 YQ |
6903 | unsigned int bit_5_8 = bits (insn1, 5, 8); |
6904 | unsigned int bit_9 = bit (insn1, 9); | |
6905 | unsigned int bit_4 = bit (insn1, 4); | |
34518530 YQ |
6906 | |
6907 | if (bit_9 == 0) | |
6908 | { | |
6909 | if (bit_5_8 == 2) | |
6910 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6911 | "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2", | |
6912 | dsc); | |
6913 | else if (bit_5_8 == 0) /* UNDEFINED. */ | |
6914 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
6915 | else | |
6916 | { | |
6917 | /*coproc is 101x. SIMD/VFP, ext registers load/store. */ | |
6918 | if ((coproc & 0xe) == 0xa) | |
6919 | return thumb2_decode_ext_reg_ld_st (gdbarch, insn1, insn2, regs, | |
6920 | dsc); | |
6921 | else /* coproc is not 101x. */ | |
6922 | { | |
6923 | if (bit_4 == 0) /* STC/STC2. */ | |
6924 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
6925 | "stc/stc2", dsc); | |
405feb71 | 6926 | else /* LDC/LDC2 {literal, immediate}. */ |
34518530 YQ |
6927 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, |
6928 | regs, dsc); | |
6929 | } | |
6930 | } | |
6931 | } | |
6932 | else | |
6933 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "coproc", dsc); | |
6934 | ||
6935 | return 0; | |
6936 | } | |
6937 | ||
6938 | static void | |
6939 | install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 6940 | arm_displaced_step_closure *dsc, int rd) |
34518530 YQ |
6941 | { |
6942 | /* ADR Rd, #imm | |
6943 | ||
6944 | Rewrite as: | |
6945 | ||
6946 | Preparation: Rd <- PC | |
6947 | Insn: ADD Rd, #imm | |
6948 | Cleanup: Null. | |
6949 | */ | |
6950 | ||
6951 | /* Rd <- PC */ | |
6952 | int val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
6953 | displaced_write_reg (regs, dsc, rd, val, CANNOT_WRITE_PC); | |
6954 | } | |
6955 | ||
6956 | static int | |
6957 | thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 6958 | arm_displaced_step_closure *dsc, |
34518530 YQ |
6959 | int rd, unsigned int imm) |
6960 | { | |
6961 | ||
6962 | /* Encoding T2: ADDS Rd, #imm */ | |
6963 | dsc->modinsn[0] = (0x3000 | (rd << 8) | imm); | |
6964 | ||
6965 | install_pc_relative (gdbarch, regs, dsc, rd); | |
6966 | ||
6967 | return 0; | |
6968 | } | |
6969 | ||
6970 | static int | |
6971 | thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn, | |
6972 | struct regcache *regs, | |
cfba9872 | 6973 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6974 | { |
6975 | unsigned int rd = bits (insn, 8, 10); | |
6976 | unsigned int imm8 = bits (insn, 0, 7); | |
6977 | ||
6978 | if (debug_displaced) | |
6979 | fprintf_unfiltered (gdb_stdlog, | |
6980 | "displaced: copying thumb adr r%d, #%d insn %.4x\n", | |
6981 | rd, imm8, insn); | |
6982 | ||
6983 | return thumb_copy_pc_relative_16bit (gdbarch, regs, dsc, rd, imm8); | |
6984 | } | |
6985 | ||
6986 | static int | |
6987 | thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
6988 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 6989 | arm_displaced_step_closure *dsc) |
34518530 YQ |
6990 | { |
6991 | unsigned int rd = bits (insn2, 8, 11); | |
6992 | /* Since immediate has the same encoding in ADR ADD and SUB, so we simply | |
6993 | extract raw immediate encoding rather than computing immediate. When | |
6994 | generating ADD or SUB instruction, we can simply perform OR operation to | |
6995 | set immediate into ADD. */ | |
6996 | unsigned int imm_3_8 = insn2 & 0x70ff; | |
6997 | unsigned int imm_i = insn1 & 0x0400; /* Clear all bits except bit 10. */ | |
6998 | ||
6999 | if (debug_displaced) | |
7000 | fprintf_unfiltered (gdb_stdlog, | |
7001 | "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n", | |
7002 | rd, imm_i, imm_3_8, insn1, insn2); | |
7003 | ||
7004 | if (bit (insn1, 7)) /* Encoding T2 */ | |
7005 | { | |
7006 | /* Encoding T3: SUB Rd, Rd, #imm */ | |
7007 | dsc->modinsn[0] = (0xf1a0 | rd | imm_i); | |
7008 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
7009 | } | |
7010 | else /* Encoding T3 */ | |
7011 | { | |
7012 | /* Encoding T3: ADD Rd, Rd, #imm */ | |
7013 | dsc->modinsn[0] = (0xf100 | rd | imm_i); | |
7014 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
7015 | } | |
7016 | dsc->numinsns = 2; | |
7017 | ||
7018 | install_pc_relative (gdbarch, regs, dsc, rd); | |
7019 | ||
7020 | return 0; | |
7021 | } | |
7022 | ||
7023 | static int | |
615234c1 | 7024 | thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, uint16_t insn1, |
34518530 | 7025 | struct regcache *regs, |
cfba9872 | 7026 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7027 | { |
7028 | unsigned int rt = bits (insn1, 8, 10); | |
7029 | unsigned int pc; | |
7030 | int imm8 = (bits (insn1, 0, 7) << 2); | |
34518530 YQ |
7031 | |
7032 | /* LDR Rd, #imm8 | |
7033 | ||
7034 | Rwrite as: | |
7035 | ||
7036 | Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8; | |
7037 | ||
7038 | Insn: LDR R0, [R2, R3]; | |
7039 | Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */ | |
7040 | ||
7041 | if (debug_displaced) | |
7042 | fprintf_unfiltered (gdb_stdlog, | |
7043 | "displaced: copying thumb ldr r%d [pc #%d]\n" | |
7044 | , rt, imm8); | |
7045 | ||
7046 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
7047 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
7048 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
7049 | pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
7050 | /* The assembler calculates the required value of the offset from the | |
7051 | Align(PC,4) value of this instruction to the label. */ | |
7052 | pc = pc & 0xfffffffc; | |
7053 | ||
7054 | displaced_write_reg (regs, dsc, 2, pc, CANNOT_WRITE_PC); | |
7055 | displaced_write_reg (regs, dsc, 3, imm8, CANNOT_WRITE_PC); | |
7056 | ||
7057 | dsc->rd = rt; | |
7058 | dsc->u.ldst.xfersize = 4; | |
7059 | dsc->u.ldst.rn = 0; | |
7060 | dsc->u.ldst.immed = 0; | |
7061 | dsc->u.ldst.writeback = 0; | |
7062 | dsc->u.ldst.restore_r4 = 0; | |
7063 | ||
7064 | dsc->modinsn[0] = 0x58d0; /* ldr r0, [r2, r3]*/ | |
7065 | ||
7066 | dsc->cleanup = &cleanup_load; | |
7067 | ||
7068 | return 0; | |
7069 | } | |
7070 | ||
405feb71 | 7071 | /* Copy Thumb cbnz/cbz instruction. */ |
34518530 YQ |
7072 | |
7073 | static int | |
7074 | thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1, | |
7075 | struct regcache *regs, | |
cfba9872 | 7076 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7077 | { |
7078 | int non_zero = bit (insn1, 11); | |
7079 | unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1); | |
7080 | CORE_ADDR from = dsc->insn_addr; | |
7081 | int rn = bits (insn1, 0, 2); | |
7082 | int rn_val = displaced_read_reg (regs, dsc, rn); | |
7083 | ||
7084 | dsc->u.branch.cond = (rn_val && non_zero) || (!rn_val && !non_zero); | |
7085 | /* CBNZ and CBZ do not affect the condition flags. If condition is true, | |
7086 | set it INST_AL, so cleanup_branch will know branch is taken, otherwise, | |
7087 | condition is false, let it be, cleanup_branch will do nothing. */ | |
7088 | if (dsc->u.branch.cond) | |
7089 | { | |
7090 | dsc->u.branch.cond = INST_AL; | |
7091 | dsc->u.branch.dest = from + 4 + imm5; | |
7092 | } | |
7093 | else | |
7094 | dsc->u.branch.dest = from + 2; | |
7095 | ||
7096 | dsc->u.branch.link = 0; | |
7097 | dsc->u.branch.exchange = 0; | |
7098 | ||
7099 | if (debug_displaced) | |
7100 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s [r%d = 0x%x]" | |
7101 | " insn %.4x to %.8lx\n", non_zero ? "cbnz" : "cbz", | |
7102 | rn, rn_val, insn1, dsc->u.branch.dest); | |
7103 | ||
7104 | dsc->modinsn[0] = THUMB_NOP; | |
7105 | ||
7106 | dsc->cleanup = &cleanup_branch; | |
7107 | return 0; | |
7108 | } | |
7109 | ||
7110 | /* Copy Table Branch Byte/Halfword */ | |
7111 | static int | |
7112 | thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1, | |
7113 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 7114 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7115 | { |
7116 | ULONGEST rn_val, rm_val; | |
7117 | int is_tbh = bit (insn2, 4); | |
7118 | CORE_ADDR halfwords = 0; | |
7119 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7120 | ||
7121 | rn_val = displaced_read_reg (regs, dsc, bits (insn1, 0, 3)); | |
7122 | rm_val = displaced_read_reg (regs, dsc, bits (insn2, 0, 3)); | |
7123 | ||
7124 | if (is_tbh) | |
7125 | { | |
7126 | gdb_byte buf[2]; | |
7127 | ||
7128 | target_read_memory (rn_val + 2 * rm_val, buf, 2); | |
7129 | halfwords = extract_unsigned_integer (buf, 2, byte_order); | |
7130 | } | |
7131 | else | |
7132 | { | |
7133 | gdb_byte buf[1]; | |
7134 | ||
7135 | target_read_memory (rn_val + rm_val, buf, 1); | |
7136 | halfwords = extract_unsigned_integer (buf, 1, byte_order); | |
7137 | } | |
7138 | ||
7139 | if (debug_displaced) | |
7140 | fprintf_unfiltered (gdb_stdlog, "displaced: %s base 0x%x offset 0x%x" | |
7141 | " offset 0x%x\n", is_tbh ? "tbh" : "tbb", | |
7142 | (unsigned int) rn_val, (unsigned int) rm_val, | |
7143 | (unsigned int) halfwords); | |
7144 | ||
7145 | dsc->u.branch.cond = INST_AL; | |
7146 | dsc->u.branch.link = 0; | |
7147 | dsc->u.branch.exchange = 0; | |
7148 | dsc->u.branch.dest = dsc->insn_addr + 4 + 2 * halfwords; | |
7149 | ||
7150 | dsc->cleanup = &cleanup_branch; | |
7151 | ||
7152 | return 0; | |
7153 | } | |
7154 | ||
7155 | static void | |
7156 | cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs, | |
cfba9872 | 7157 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7158 | { |
7159 | /* PC <- r7 */ | |
7160 | int val = displaced_read_reg (regs, dsc, 7); | |
7161 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, val, BX_WRITE_PC); | |
7162 | ||
7163 | /* r7 <- r8 */ | |
7164 | val = displaced_read_reg (regs, dsc, 8); | |
7165 | displaced_write_reg (regs, dsc, 7, val, CANNOT_WRITE_PC); | |
7166 | ||
7167 | /* r8 <- tmp[0] */ | |
7168 | displaced_write_reg (regs, dsc, 8, dsc->tmp[0], CANNOT_WRITE_PC); | |
7169 | ||
7170 | } | |
7171 | ||
7172 | static int | |
615234c1 | 7173 | thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, uint16_t insn1, |
34518530 | 7174 | struct regcache *regs, |
cfba9872 | 7175 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7176 | { |
7177 | dsc->u.block.regmask = insn1 & 0x00ff; | |
7178 | ||
7179 | /* Rewrite instruction: POP {rX, rY, ...,rZ, PC} | |
7180 | to : | |
7181 | ||
7182 | (1) register list is full, that is, r0-r7 are used. | |
7183 | Prepare: tmp[0] <- r8 | |
7184 | ||
7185 | POP {r0, r1, ...., r6, r7}; remove PC from reglist | |
7186 | MOV r8, r7; Move value of r7 to r8; | |
7187 | POP {r7}; Store PC value into r7. | |
7188 | ||
7189 | Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0] | |
7190 | ||
7191 | (2) register list is not full, supposing there are N registers in | |
7192 | register list (except PC, 0 <= N <= 7). | |
7193 | Prepare: for each i, 0 - N, tmp[i] <- ri. | |
7194 | ||
7195 | POP {r0, r1, ...., rN}; | |
7196 | ||
7197 | Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN | |
7198 | from tmp[] properly. | |
7199 | */ | |
7200 | if (debug_displaced) | |
7201 | fprintf_unfiltered (gdb_stdlog, | |
7202 | "displaced: copying thumb pop {%.8x, pc} insn %.4x\n", | |
7203 | dsc->u.block.regmask, insn1); | |
7204 | ||
7205 | if (dsc->u.block.regmask == 0xff) | |
7206 | { | |
7207 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 8); | |
7208 | ||
7209 | dsc->modinsn[0] = (insn1 & 0xfeff); /* POP {r0,r1,...,r6, r7} */ | |
7210 | dsc->modinsn[1] = 0x46b8; /* MOV r8, r7 */ | |
7211 | dsc->modinsn[2] = 0xbc80; /* POP {r7} */ | |
7212 | ||
7213 | dsc->numinsns = 3; | |
7214 | dsc->cleanup = &cleanup_pop_pc_16bit_all; | |
7215 | } | |
7216 | else | |
7217 | { | |
5f661e03 | 7218 | unsigned int num_in_list = count_one_bits (dsc->u.block.regmask); |
bec2ab5a SM |
7219 | unsigned int i; |
7220 | unsigned int new_regmask; | |
34518530 YQ |
7221 | |
7222 | for (i = 0; i < num_in_list + 1; i++) | |
7223 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
7224 | ||
7225 | new_regmask = (1 << (num_in_list + 1)) - 1; | |
7226 | ||
7227 | if (debug_displaced) | |
7228 | fprintf_unfiltered (gdb_stdlog, _("displaced: POP " | |
7229 | "{..., pc}: original reg list %.4x," | |
7230 | " modified list %.4x\n"), | |
7231 | (int) dsc->u.block.regmask, new_regmask); | |
7232 | ||
7233 | dsc->u.block.regmask |= 0x8000; | |
7234 | dsc->u.block.writeback = 0; | |
7235 | dsc->u.block.cond = INST_AL; | |
7236 | ||
7237 | dsc->modinsn[0] = (insn1 & ~0x1ff) | (new_regmask & 0xff); | |
7238 | ||
7239 | dsc->cleanup = &cleanup_block_load_pc; | |
7240 | } | |
7241 | ||
7242 | return 0; | |
7243 | } | |
7244 | ||
7245 | static void | |
7246 | thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
7247 | struct regcache *regs, | |
cfba9872 | 7248 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7249 | { |
7250 | unsigned short op_bit_12_15 = bits (insn1, 12, 15); | |
7251 | unsigned short op_bit_10_11 = bits (insn1, 10, 11); | |
7252 | int err = 0; | |
7253 | ||
7254 | /* 16-bit thumb instructions. */ | |
7255 | switch (op_bit_12_15) | |
7256 | { | |
7257 | /* Shift (imme), add, subtract, move and compare. */ | |
7258 | case 0: case 1: case 2: case 3: | |
7259 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
7260 | "shift/add/sub/mov/cmp", | |
7261 | dsc); | |
7262 | break; | |
7263 | case 4: | |
7264 | switch (op_bit_10_11) | |
7265 | { | |
7266 | case 0: /* Data-processing */ | |
7267 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
7268 | "data-processing", | |
7269 | dsc); | |
7270 | break; | |
7271 | case 1: /* Special data instructions and branch and exchange. */ | |
7272 | { | |
7273 | unsigned short op = bits (insn1, 7, 9); | |
7274 | if (op == 6 || op == 7) /* BX or BLX */ | |
7275 | err = thumb_copy_bx_blx_reg (gdbarch, insn1, regs, dsc); | |
7276 | else if (bits (insn1, 6, 7) != 0) /* ADD/MOV/CMP high registers. */ | |
7277 | err = thumb_copy_alu_reg (gdbarch, insn1, regs, dsc); | |
7278 | else | |
7279 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "special data", | |
7280 | dsc); | |
7281 | } | |
7282 | break; | |
7283 | default: /* LDR (literal) */ | |
7284 | err = thumb_copy_16bit_ldr_literal (gdbarch, insn1, regs, dsc); | |
7285 | } | |
7286 | break; | |
7287 | case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */ | |
7288 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldr/str", dsc); | |
7289 | break; | |
7290 | case 10: | |
7291 | if (op_bit_10_11 < 2) /* Generate PC-relative address */ | |
7292 | err = thumb_decode_pc_relative_16bit (gdbarch, insn1, regs, dsc); | |
7293 | else /* Generate SP-relative address */ | |
7294 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "sp-relative", dsc); | |
7295 | break; | |
7296 | case 11: /* Misc 16-bit instructions */ | |
7297 | { | |
7298 | switch (bits (insn1, 8, 11)) | |
7299 | { | |
7300 | case 1: case 3: case 9: case 11: /* CBNZ, CBZ */ | |
7301 | err = thumb_copy_cbnz_cbz (gdbarch, insn1, regs, dsc); | |
7302 | break; | |
7303 | case 12: case 13: /* POP */ | |
7304 | if (bit (insn1, 8)) /* PC is in register list. */ | |
7305 | err = thumb_copy_pop_pc_16bit (gdbarch, insn1, regs, dsc); | |
7306 | else | |
7307 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "pop", dsc); | |
7308 | break; | |
7309 | case 15: /* If-Then, and hints */ | |
7310 | if (bits (insn1, 0, 3)) | |
7311 | /* If-Then makes up to four following instructions conditional. | |
7312 | IT instruction itself is not conditional, so handle it as a | |
7313 | common unmodified instruction. */ | |
7314 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "If-Then", | |
7315 | dsc); | |
7316 | else | |
7317 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "hints", dsc); | |
7318 | break; | |
7319 | default: | |
7320 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "misc", dsc); | |
7321 | } | |
7322 | } | |
7323 | break; | |
7324 | case 12: | |
7325 | if (op_bit_10_11 < 2) /* Store multiple registers */ | |
7326 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "stm", dsc); | |
7327 | else /* Load multiple registers */ | |
7328 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldm", dsc); | |
7329 | break; | |
7330 | case 13: /* Conditional branch and supervisor call */ | |
7331 | if (bits (insn1, 9, 11) != 7) /* conditional branch */ | |
7332 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
7333 | else | |
7334 | err = thumb_copy_svc (gdbarch, insn1, regs, dsc); | |
7335 | break; | |
7336 | case 14: /* Unconditional branch */ | |
7337 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
7338 | break; | |
7339 | default: | |
7340 | err = 1; | |
7341 | } | |
7342 | ||
7343 | if (err) | |
7344 | internal_error (__FILE__, __LINE__, | |
7345 | _("thumb_process_displaced_16bit_insn: Instruction decode error")); | |
7346 | } | |
7347 | ||
7348 | static int | |
7349 | decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch, | |
7350 | uint16_t insn1, uint16_t insn2, | |
7351 | struct regcache *regs, | |
cfba9872 | 7352 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7353 | { |
7354 | int rt = bits (insn2, 12, 15); | |
7355 | int rn = bits (insn1, 0, 3); | |
7356 | int op1 = bits (insn1, 7, 8); | |
34518530 YQ |
7357 | |
7358 | switch (bits (insn1, 5, 6)) | |
7359 | { | |
7360 | case 0: /* Load byte and memory hints */ | |
7361 | if (rt == 0xf) /* PLD/PLI */ | |
7362 | { | |
7363 | if (rn == 0xf) | |
7364 | /* PLD literal or Encoding T3 of PLI(immediate, literal). */ | |
7365 | return thumb2_copy_preload (gdbarch, insn1, insn2, regs, dsc); | |
7366 | else | |
7367 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7368 | "pli/pld", dsc); | |
7369 | } | |
7370 | else | |
7371 | { | |
7372 | if (rn == 0xf) /* LDRB/LDRSB (literal) */ | |
7373 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
7374 | 1); | |
7375 | else | |
7376 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7377 | "ldrb{reg, immediate}/ldrbt", | |
7378 | dsc); | |
7379 | } | |
7380 | ||
7381 | break; | |
7382 | case 1: /* Load halfword and memory hints. */ | |
7383 | if (rt == 0xf) /* PLD{W} and Unalloc memory hint. */ | |
7384 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7385 | "pld/unalloc memhint", dsc); | |
7386 | else | |
7387 | { | |
7388 | if (rn == 0xf) | |
7389 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
7390 | 2); | |
7391 | else | |
7392 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7393 | "ldrh/ldrht", dsc); | |
7394 | } | |
7395 | break; | |
7396 | case 2: /* Load word */ | |
7397 | { | |
7398 | int insn2_bit_8_11 = bits (insn2, 8, 11); | |
7399 | ||
7400 | if (rn == 0xf) | |
7401 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, 4); | |
7402 | else if (op1 == 0x1) /* Encoding T3 */ | |
7403 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, dsc, | |
7404 | 0, 1); | |
7405 | else /* op1 == 0x0 */ | |
7406 | { | |
7407 | if (insn2_bit_8_11 == 0xc || (insn2_bit_8_11 & 0x9) == 0x9) | |
7408 | /* LDR (immediate) */ | |
7409 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
7410 | dsc, bit (insn2, 8), 1); | |
7411 | else if (insn2_bit_8_11 == 0xe) /* LDRT */ | |
7412 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7413 | "ldrt", dsc); | |
7414 | else | |
7415 | /* LDR (register) */ | |
7416 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
7417 | dsc, 0, 0); | |
7418 | } | |
7419 | break; | |
7420 | } | |
7421 | default: | |
7422 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
7423 | break; | |
7424 | } | |
7425 | return 0; | |
7426 | } | |
7427 | ||
7428 | static void | |
7429 | thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
7430 | uint16_t insn2, struct regcache *regs, | |
cfba9872 | 7431 | arm_displaced_step_closure *dsc) |
34518530 YQ |
7432 | { |
7433 | int err = 0; | |
7434 | unsigned short op = bit (insn2, 15); | |
7435 | unsigned int op1 = bits (insn1, 11, 12); | |
7436 | ||
7437 | switch (op1) | |
7438 | { | |
7439 | case 1: | |
7440 | { | |
7441 | switch (bits (insn1, 9, 10)) | |
7442 | { | |
7443 | case 0: | |
7444 | if (bit (insn1, 6)) | |
7445 | { | |
405feb71 | 7446 | /* Load/store {dual, exclusive}, table branch. */ |
34518530 YQ |
7447 | if (bits (insn1, 7, 8) == 1 && bits (insn1, 4, 5) == 1 |
7448 | && bits (insn2, 5, 7) == 0) | |
7449 | err = thumb2_copy_table_branch (gdbarch, insn1, insn2, regs, | |
7450 | dsc); | |
7451 | else | |
7452 | /* PC is not allowed to use in load/store {dual, exclusive} | |
7453 | instructions. */ | |
7454 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7455 | "load/store dual/ex", dsc); | |
7456 | } | |
7457 | else /* load/store multiple */ | |
7458 | { | |
7459 | switch (bits (insn1, 7, 8)) | |
7460 | { | |
7461 | case 0: case 3: /* SRS, RFE */ | |
7462 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7463 | "srs/rfe", dsc); | |
7464 | break; | |
7465 | case 1: case 2: /* LDM/STM/PUSH/POP */ | |
7466 | err = thumb2_copy_block_xfer (gdbarch, insn1, insn2, regs, dsc); | |
7467 | break; | |
7468 | } | |
7469 | } | |
7470 | break; | |
7471 | ||
7472 | case 1: | |
7473 | /* Data-processing (shift register). */ | |
7474 | err = thumb2_decode_dp_shift_reg (gdbarch, insn1, insn2, regs, | |
7475 | dsc); | |
7476 | break; | |
7477 | default: /* Coprocessor instructions. */ | |
7478 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
7479 | break; | |
7480 | } | |
7481 | break; | |
7482 | } | |
7483 | case 2: /* op1 = 2 */ | |
7484 | if (op) /* Branch and misc control. */ | |
7485 | { | |
7486 | if (bit (insn2, 14) /* BLX/BL */ | |
7487 | || bit (insn2, 12) /* Unconditional branch */ | |
7488 | || (bits (insn1, 7, 9) != 0x7)) /* Conditional branch */ | |
7489 | err = thumb2_copy_b_bl_blx (gdbarch, insn1, insn2, regs, dsc); | |
7490 | else | |
7491 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7492 | "misc ctrl", dsc); | |
7493 | } | |
7494 | else | |
7495 | { | |
7496 | if (bit (insn1, 9)) /* Data processing (plain binary imm). */ | |
7497 | { | |
b926417a | 7498 | int dp_op = bits (insn1, 4, 8); |
34518530 | 7499 | int rn = bits (insn1, 0, 3); |
b926417a | 7500 | if ((dp_op == 0 || dp_op == 0xa) && rn == 0xf) |
34518530 YQ |
7501 | err = thumb_copy_pc_relative_32bit (gdbarch, insn1, insn2, |
7502 | regs, dsc); | |
7503 | else | |
7504 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7505 | "dp/pb", dsc); | |
7506 | } | |
405feb71 | 7507 | else /* Data processing (modified immediate) */ |
34518530 YQ |
7508 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
7509 | "dp/mi", dsc); | |
7510 | } | |
7511 | break; | |
7512 | case 3: /* op1 = 3 */ | |
7513 | switch (bits (insn1, 9, 10)) | |
7514 | { | |
7515 | case 0: | |
7516 | if (bit (insn1, 4)) | |
7517 | err = decode_thumb_32bit_ld_mem_hints (gdbarch, insn1, insn2, | |
7518 | regs, dsc); | |
7519 | else /* NEON Load/Store and Store single data item */ | |
7520 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7521 | "neon elt/struct load/store", | |
7522 | dsc); | |
7523 | break; | |
7524 | case 1: /* op1 = 3, bits (9, 10) == 1 */ | |
7525 | switch (bits (insn1, 7, 8)) | |
7526 | { | |
7527 | case 0: case 1: /* Data processing (register) */ | |
7528 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7529 | "dp(reg)", dsc); | |
7530 | break; | |
7531 | case 2: /* Multiply and absolute difference */ | |
7532 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7533 | "mul/mua/diff", dsc); | |
7534 | break; | |
7535 | case 3: /* Long multiply and divide */ | |
7536 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7537 | "lmul/lmua", dsc); | |
7538 | break; | |
7539 | } | |
7540 | break; | |
7541 | default: /* Coprocessor instructions */ | |
7542 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
7543 | break; | |
7544 | } | |
7545 | break; | |
7546 | default: | |
7547 | err = 1; | |
7548 | } | |
7549 | ||
7550 | if (err) | |
7551 | internal_error (__FILE__, __LINE__, | |
7552 | _("thumb_process_displaced_32bit_insn: Instruction decode error")); | |
7553 | ||
7554 | } | |
7555 | ||
b434a28f YQ |
7556 | static void |
7557 | thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, | |
12545665 | 7558 | struct regcache *regs, |
cfba9872 | 7559 | arm_displaced_step_closure *dsc) |
b434a28f | 7560 | { |
34518530 YQ |
7561 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
7562 | uint16_t insn1 | |
7563 | = read_memory_unsigned_integer (from, 2, byte_order_for_code); | |
7564 | ||
7565 | if (debug_displaced) | |
7566 | fprintf_unfiltered (gdb_stdlog, "displaced: process thumb insn %.4x " | |
7567 | "at %.8lx\n", insn1, (unsigned long) from); | |
7568 | ||
7569 | dsc->is_thumb = 1; | |
7570 | dsc->insn_size = thumb_insn_size (insn1); | |
7571 | if (thumb_insn_size (insn1) == 4) | |
7572 | { | |
7573 | uint16_t insn2 | |
7574 | = read_memory_unsigned_integer (from + 2, 2, byte_order_for_code); | |
7575 | thumb_process_displaced_32bit_insn (gdbarch, insn1, insn2, regs, dsc); | |
7576 | } | |
7577 | else | |
7578 | thumb_process_displaced_16bit_insn (gdbarch, insn1, regs, dsc); | |
b434a28f YQ |
7579 | } |
7580 | ||
cca44b1b | 7581 | void |
b434a28f YQ |
7582 | arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
7583 | CORE_ADDR to, struct regcache *regs, | |
cfba9872 | 7584 | arm_displaced_step_closure *dsc) |
cca44b1b JB |
7585 | { |
7586 | int err = 0; | |
b434a28f YQ |
7587 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
7588 | uint32_t insn; | |
cca44b1b JB |
7589 | |
7590 | /* Most displaced instructions use a 1-instruction scratch space, so set this | |
7591 | here and override below if/when necessary. */ | |
7592 | dsc->numinsns = 1; | |
7593 | dsc->insn_addr = from; | |
7594 | dsc->scratch_base = to; | |
7595 | dsc->cleanup = NULL; | |
7596 | dsc->wrote_to_pc = 0; | |
7597 | ||
b434a28f | 7598 | if (!displaced_in_arm_mode (regs)) |
12545665 | 7599 | return thumb_process_displaced_insn (gdbarch, from, regs, dsc); |
b434a28f | 7600 | |
4db71c0b YQ |
7601 | dsc->is_thumb = 0; |
7602 | dsc->insn_size = 4; | |
b434a28f YQ |
7603 | insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); |
7604 | if (debug_displaced) | |
7605 | fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx " | |
7606 | "at %.8lx\n", (unsigned long) insn, | |
7607 | (unsigned long) from); | |
7608 | ||
cca44b1b | 7609 | if ((insn & 0xf0000000) == 0xf0000000) |
7ff120b4 | 7610 | err = arm_decode_unconditional (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7611 | else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24)) |
7612 | { | |
7613 | case 0x0: case 0x1: case 0x2: case 0x3: | |
7ff120b4 | 7614 | err = arm_decode_dp_misc (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7615 | break; |
7616 | ||
7617 | case 0x4: case 0x5: case 0x6: | |
7ff120b4 | 7618 | err = arm_decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7619 | break; |
7620 | ||
7621 | case 0x7: | |
7ff120b4 | 7622 | err = arm_decode_media (gdbarch, insn, dsc); |
cca44b1b JB |
7623 | break; |
7624 | ||
7625 | case 0x8: case 0x9: case 0xa: case 0xb: | |
7ff120b4 | 7626 | err = arm_decode_b_bl_ldmstm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7627 | break; |
7628 | ||
7629 | case 0xc: case 0xd: case 0xe: case 0xf: | |
12545665 | 7630 | err = arm_decode_svc_copro (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7631 | break; |
7632 | } | |
7633 | ||
7634 | if (err) | |
7635 | internal_error (__FILE__, __LINE__, | |
7636 | _("arm_process_displaced_insn: Instruction decode error")); | |
7637 | } | |
7638 | ||
7639 | /* Actually set up the scratch space for a displaced instruction. */ | |
7640 | ||
7641 | void | |
7642 | arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from, | |
cfba9872 | 7643 | CORE_ADDR to, arm_displaced_step_closure *dsc) |
cca44b1b JB |
7644 | { |
7645 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4db71c0b | 7646 | unsigned int i, len, offset; |
cca44b1b | 7647 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
4db71c0b | 7648 | int size = dsc->is_thumb? 2 : 4; |
948f8e3d | 7649 | const gdb_byte *bkp_insn; |
cca44b1b | 7650 | |
4db71c0b | 7651 | offset = 0; |
cca44b1b JB |
7652 | /* Poke modified instruction(s). */ |
7653 | for (i = 0; i < dsc->numinsns; i++) | |
7654 | { | |
7655 | if (debug_displaced) | |
4db71c0b YQ |
7656 | { |
7657 | fprintf_unfiltered (gdb_stdlog, "displaced: writing insn "); | |
7658 | if (size == 4) | |
7659 | fprintf_unfiltered (gdb_stdlog, "%.8lx", | |
7660 | dsc->modinsn[i]); | |
7661 | else if (size == 2) | |
7662 | fprintf_unfiltered (gdb_stdlog, "%.4x", | |
7663 | (unsigned short)dsc->modinsn[i]); | |
7664 | ||
7665 | fprintf_unfiltered (gdb_stdlog, " at %.8lx\n", | |
7666 | (unsigned long) to + offset); | |
7667 | ||
7668 | } | |
7669 | write_memory_unsigned_integer (to + offset, size, | |
7670 | byte_order_for_code, | |
cca44b1b | 7671 | dsc->modinsn[i]); |
4db71c0b YQ |
7672 | offset += size; |
7673 | } | |
7674 | ||
7675 | /* Choose the correct breakpoint instruction. */ | |
7676 | if (dsc->is_thumb) | |
7677 | { | |
7678 | bkp_insn = tdep->thumb_breakpoint; | |
7679 | len = tdep->thumb_breakpoint_size; | |
7680 | } | |
7681 | else | |
7682 | { | |
7683 | bkp_insn = tdep->arm_breakpoint; | |
7684 | len = tdep->arm_breakpoint_size; | |
cca44b1b JB |
7685 | } |
7686 | ||
7687 | /* Put breakpoint afterwards. */ | |
4db71c0b | 7688 | write_memory (to + offset, bkp_insn, len); |
cca44b1b JB |
7689 | |
7690 | if (debug_displaced) | |
7691 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", | |
7692 | paddress (gdbarch, from), paddress (gdbarch, to)); | |
7693 | } | |
7694 | ||
cca44b1b JB |
7695 | /* Entry point for cleaning things up after a displaced instruction has been |
7696 | single-stepped. */ | |
7697 | ||
7698 | void | |
7699 | arm_displaced_step_fixup (struct gdbarch *gdbarch, | |
cfba9872 | 7700 | struct displaced_step_closure *dsc_, |
cca44b1b JB |
7701 | CORE_ADDR from, CORE_ADDR to, |
7702 | struct regcache *regs) | |
7703 | { | |
cfba9872 SM |
7704 | arm_displaced_step_closure *dsc = (arm_displaced_step_closure *) dsc_; |
7705 | ||
cca44b1b JB |
7706 | if (dsc->cleanup) |
7707 | dsc->cleanup (gdbarch, regs, dsc); | |
7708 | ||
7709 | if (!dsc->wrote_to_pc) | |
4db71c0b YQ |
7710 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
7711 | dsc->insn_addr + dsc->insn_size); | |
7712 | ||
cca44b1b JB |
7713 | } |
7714 | ||
7715 | #include "bfd-in2.h" | |
7716 | #include "libcoff.h" | |
7717 | ||
7718 | static int | |
7719 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) | |
7720 | { | |
e47ad6c0 YQ |
7721 | gdb_disassembler *di |
7722 | = static_cast<gdb_disassembler *>(info->application_data); | |
7723 | struct gdbarch *gdbarch = di->arch (); | |
9779414d DJ |
7724 | |
7725 | if (arm_pc_is_thumb (gdbarch, memaddr)) | |
cca44b1b JB |
7726 | { |
7727 | static asymbol *asym; | |
7728 | static combined_entry_type ce; | |
7729 | static struct coff_symbol_struct csym; | |
7730 | static struct bfd fake_bfd; | |
7731 | static bfd_target fake_target; | |
7732 | ||
7733 | if (csym.native == NULL) | |
7734 | { | |
7735 | /* Create a fake symbol vector containing a Thumb symbol. | |
7736 | This is solely so that the code in print_insn_little_arm() | |
7737 | and print_insn_big_arm() in opcodes/arm-dis.c will detect | |
7738 | the presence of a Thumb symbol and switch to decoding | |
7739 | Thumb instructions. */ | |
7740 | ||
7741 | fake_target.flavour = bfd_target_coff_flavour; | |
7742 | fake_bfd.xvec = &fake_target; | |
7743 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; | |
7744 | csym.native = &ce; | |
7745 | csym.symbol.the_bfd = &fake_bfd; | |
7746 | csym.symbol.name = "fake"; | |
7747 | asym = (asymbol *) & csym; | |
7748 | } | |
7749 | ||
7750 | memaddr = UNMAKE_THUMB_ADDR (memaddr); | |
7751 | info->symbols = &asym; | |
7752 | } | |
7753 | else | |
7754 | info->symbols = NULL; | |
7755 | ||
e60eb288 YQ |
7756 | /* GDB is able to get bfd_mach from the exe_bfd, info->mach is |
7757 | accurate, so mark USER_SPECIFIED_MACHINE_TYPE bit. Otherwise, | |
7758 | opcodes/arm-dis.c:print_insn reset info->mach, and it will trigger | |
7759 | the assert on the mismatch of info->mach and bfd_get_mach (exec_bfd) | |
7760 | in default_print_insn. */ | |
7761 | if (exec_bfd != NULL) | |
7762 | info->flags |= USER_SPECIFIED_MACHINE_TYPE; | |
7763 | ||
6394c606 | 7764 | return default_print_insn (memaddr, info); |
cca44b1b JB |
7765 | } |
7766 | ||
7767 | /* The following define instruction sequences that will cause ARM | |
7768 | cpu's to take an undefined instruction trap. These are used to | |
7769 | signal a breakpoint to GDB. | |
7770 | ||
7771 | The newer ARMv4T cpu's are capable of operating in ARM or Thumb | |
7772 | modes. A different instruction is required for each mode. The ARM | |
7773 | cpu's can also be big or little endian. Thus four different | |
7774 | instructions are needed to support all cases. | |
7775 | ||
7776 | Note: ARMv4 defines several new instructions that will take the | |
7777 | undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does | |
7778 | not in fact add the new instructions. The new undefined | |
7779 | instructions in ARMv4 are all instructions that had no defined | |
7780 | behaviour in earlier chips. There is no guarantee that they will | |
7781 | raise an exception, but may be treated as NOP's. In practice, it | |
7782 | may only safe to rely on instructions matching: | |
7783 | ||
7784 | 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
7785 | 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 | |
7786 | C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x | |
7787 | ||
0963b4bd | 7788 | Even this may only true if the condition predicate is true. The |
cca44b1b JB |
7789 | following use a condition predicate of ALWAYS so it is always TRUE. |
7790 | ||
7791 | There are other ways of forcing a breakpoint. GNU/Linux, RISC iX, | |
7792 | and NetBSD all use a software interrupt rather than an undefined | |
7793 | instruction to force a trap. This can be handled by by the | |
7794 | abi-specific code during establishment of the gdbarch vector. */ | |
7795 | ||
7796 | #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7} | |
7797 | #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE} | |
7798 | #define THUMB_LE_BREAKPOINT {0xbe,0xbe} | |
7799 | #define THUMB_BE_BREAKPOINT {0xbe,0xbe} | |
7800 | ||
948f8e3d PA |
7801 | static const gdb_byte arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT; |
7802 | static const gdb_byte arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT; | |
7803 | static const gdb_byte arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT; | |
7804 | static const gdb_byte arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT; | |
cca44b1b | 7805 | |
cd6c3b4f YQ |
7806 | /* Implement the breakpoint_kind_from_pc gdbarch method. */ |
7807 | ||
d19280ad YQ |
7808 | static int |
7809 | arm_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) | |
cca44b1b JB |
7810 | { |
7811 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
177321bd | 7812 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
cca44b1b | 7813 | |
9779414d | 7814 | if (arm_pc_is_thumb (gdbarch, *pcptr)) |
cca44b1b JB |
7815 | { |
7816 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
177321bd DJ |
7817 | |
7818 | /* If we have a separate 32-bit breakpoint instruction for Thumb-2, | |
7819 | check whether we are replacing a 32-bit instruction. */ | |
7820 | if (tdep->thumb2_breakpoint != NULL) | |
7821 | { | |
7822 | gdb_byte buf[2]; | |
d19280ad | 7823 | |
177321bd DJ |
7824 | if (target_read_memory (*pcptr, buf, 2) == 0) |
7825 | { | |
7826 | unsigned short inst1; | |
d19280ad | 7827 | |
177321bd | 7828 | inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code); |
db24da6d | 7829 | if (thumb_insn_size (inst1) == 4) |
d19280ad | 7830 | return ARM_BP_KIND_THUMB2; |
177321bd DJ |
7831 | } |
7832 | } | |
7833 | ||
d19280ad | 7834 | return ARM_BP_KIND_THUMB; |
cca44b1b JB |
7835 | } |
7836 | else | |
d19280ad YQ |
7837 | return ARM_BP_KIND_ARM; |
7838 | ||
7839 | } | |
7840 | ||
cd6c3b4f YQ |
7841 | /* Implement the sw_breakpoint_from_kind gdbarch method. */ |
7842 | ||
d19280ad YQ |
7843 | static const gdb_byte * |
7844 | arm_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size) | |
7845 | { | |
7846 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
7847 | ||
7848 | switch (kind) | |
cca44b1b | 7849 | { |
d19280ad YQ |
7850 | case ARM_BP_KIND_ARM: |
7851 | *size = tdep->arm_breakpoint_size; | |
cca44b1b | 7852 | return tdep->arm_breakpoint; |
d19280ad YQ |
7853 | case ARM_BP_KIND_THUMB: |
7854 | *size = tdep->thumb_breakpoint_size; | |
7855 | return tdep->thumb_breakpoint; | |
7856 | case ARM_BP_KIND_THUMB2: | |
7857 | *size = tdep->thumb2_breakpoint_size; | |
7858 | return tdep->thumb2_breakpoint; | |
7859 | default: | |
7860 | gdb_assert_not_reached ("unexpected arm breakpoint kind"); | |
cca44b1b JB |
7861 | } |
7862 | } | |
7863 | ||
833b7ab5 YQ |
7864 | /* Implement the breakpoint_kind_from_current_state gdbarch method. */ |
7865 | ||
7866 | static int | |
7867 | arm_breakpoint_kind_from_current_state (struct gdbarch *gdbarch, | |
7868 | struct regcache *regcache, | |
7869 | CORE_ADDR *pcptr) | |
7870 | { | |
7871 | gdb_byte buf[4]; | |
7872 | ||
7873 | /* Check the memory pointed by PC is readable. */ | |
7874 | if (target_read_memory (regcache_read_pc (regcache), buf, 4) == 0) | |
7875 | { | |
7876 | struct arm_get_next_pcs next_pcs_ctx; | |
833b7ab5 YQ |
7877 | |
7878 | arm_get_next_pcs_ctor (&next_pcs_ctx, | |
7879 | &arm_get_next_pcs_ops, | |
7880 | gdbarch_byte_order (gdbarch), | |
7881 | gdbarch_byte_order_for_code (gdbarch), | |
7882 | 0, | |
7883 | regcache); | |
7884 | ||
a0ff9e1a | 7885 | std::vector<CORE_ADDR> next_pcs = arm_get_next_pcs (&next_pcs_ctx); |
833b7ab5 YQ |
7886 | |
7887 | /* If MEMADDR is the next instruction of current pc, do the | |
7888 | software single step computation, and get the thumb mode by | |
7889 | the destination address. */ | |
a0ff9e1a | 7890 | for (CORE_ADDR pc : next_pcs) |
833b7ab5 YQ |
7891 | { |
7892 | if (UNMAKE_THUMB_ADDR (pc) == *pcptr) | |
7893 | { | |
833b7ab5 YQ |
7894 | if (IS_THUMB_ADDR (pc)) |
7895 | { | |
7896 | *pcptr = MAKE_THUMB_ADDR (*pcptr); | |
7897 | return arm_breakpoint_kind_from_pc (gdbarch, pcptr); | |
7898 | } | |
7899 | else | |
7900 | return ARM_BP_KIND_ARM; | |
7901 | } | |
7902 | } | |
833b7ab5 YQ |
7903 | } |
7904 | ||
7905 | return arm_breakpoint_kind_from_pc (gdbarch, pcptr); | |
7906 | } | |
7907 | ||
cca44b1b JB |
7908 | /* Extract from an array REGBUF containing the (raw) register state a |
7909 | function return value of type TYPE, and copy that, in virtual | |
7910 | format, into VALBUF. */ | |
7911 | ||
7912 | static void | |
7913 | arm_extract_return_value (struct type *type, struct regcache *regs, | |
7914 | gdb_byte *valbuf) | |
7915 | { | |
ac7936df | 7916 | struct gdbarch *gdbarch = regs->arch (); |
cca44b1b JB |
7917 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
7918 | ||
78134374 | 7919 | if (TYPE_CODE_FLT == type->code ()) |
cca44b1b JB |
7920 | { |
7921 | switch (gdbarch_tdep (gdbarch)->fp_model) | |
7922 | { | |
7923 | case ARM_FLOAT_FPA: | |
7924 | { | |
7925 | /* The value is in register F0 in internal format. We need to | |
7926 | extract the raw value and then convert it to the desired | |
7927 | internal type. */ | |
f0452268 | 7928 | bfd_byte tmpbuf[ARM_FP_REGISTER_SIZE]; |
cca44b1b | 7929 | |
dca08e1f | 7930 | regs->cooked_read (ARM_F0_REGNUM, tmpbuf); |
3b2ca824 UW |
7931 | target_float_convert (tmpbuf, arm_ext_type (gdbarch), |
7932 | valbuf, type); | |
cca44b1b JB |
7933 | } |
7934 | break; | |
7935 | ||
7936 | case ARM_FLOAT_SOFT_FPA: | |
7937 | case ARM_FLOAT_SOFT_VFP: | |
7938 | /* ARM_FLOAT_VFP can arise if this is a variadic function so | |
7939 | not using the VFP ABI code. */ | |
7940 | case ARM_FLOAT_VFP: | |
dca08e1f | 7941 | regs->cooked_read (ARM_A1_REGNUM, valbuf); |
cca44b1b | 7942 | if (TYPE_LENGTH (type) > 4) |
f0452268 AH |
7943 | regs->cooked_read (ARM_A1_REGNUM + 1, |
7944 | valbuf + ARM_INT_REGISTER_SIZE); | |
cca44b1b JB |
7945 | break; |
7946 | ||
7947 | default: | |
0963b4bd MS |
7948 | internal_error (__FILE__, __LINE__, |
7949 | _("arm_extract_return_value: " | |
7950 | "Floating point model not supported")); | |
cca44b1b JB |
7951 | break; |
7952 | } | |
7953 | } | |
78134374 SM |
7954 | else if (type->code () == TYPE_CODE_INT |
7955 | || type->code () == TYPE_CODE_CHAR | |
7956 | || type->code () == TYPE_CODE_BOOL | |
7957 | || type->code () == TYPE_CODE_PTR | |
aa006118 | 7958 | || TYPE_IS_REFERENCE (type) |
78134374 | 7959 | || type->code () == TYPE_CODE_ENUM) |
cca44b1b | 7960 | { |
b021a221 MS |
7961 | /* If the type is a plain integer, then the access is |
7962 | straight-forward. Otherwise we have to play around a bit | |
7963 | more. */ | |
cca44b1b JB |
7964 | int len = TYPE_LENGTH (type); |
7965 | int regno = ARM_A1_REGNUM; | |
7966 | ULONGEST tmp; | |
7967 | ||
7968 | while (len > 0) | |
7969 | { | |
7970 | /* By using store_unsigned_integer we avoid having to do | |
7971 | anything special for small big-endian values. */ | |
7972 | regcache_cooked_read_unsigned (regs, regno++, &tmp); | |
7973 | store_unsigned_integer (valbuf, | |
f0452268 AH |
7974 | (len > ARM_INT_REGISTER_SIZE |
7975 | ? ARM_INT_REGISTER_SIZE : len), | |
cca44b1b | 7976 | byte_order, tmp); |
f0452268 AH |
7977 | len -= ARM_INT_REGISTER_SIZE; |
7978 | valbuf += ARM_INT_REGISTER_SIZE; | |
cca44b1b JB |
7979 | } |
7980 | } | |
7981 | else | |
7982 | { | |
7983 | /* For a structure or union the behaviour is as if the value had | |
7984 | been stored to word-aligned memory and then loaded into | |
7985 | registers with 32-bit load instruction(s). */ | |
7986 | int len = TYPE_LENGTH (type); | |
7987 | int regno = ARM_A1_REGNUM; | |
f0452268 | 7988 | bfd_byte tmpbuf[ARM_INT_REGISTER_SIZE]; |
cca44b1b JB |
7989 | |
7990 | while (len > 0) | |
7991 | { | |
dca08e1f | 7992 | regs->cooked_read (regno++, tmpbuf); |
cca44b1b | 7993 | memcpy (valbuf, tmpbuf, |
f0452268 AH |
7994 | len > ARM_INT_REGISTER_SIZE ? ARM_INT_REGISTER_SIZE : len); |
7995 | len -= ARM_INT_REGISTER_SIZE; | |
7996 | valbuf += ARM_INT_REGISTER_SIZE; | |
cca44b1b JB |
7997 | } |
7998 | } | |
7999 | } | |
8000 | ||
8001 | ||
8002 | /* Will a function return an aggregate type in memory or in a | |
8003 | register? Return 0 if an aggregate type can be returned in a | |
8004 | register, 1 if it must be returned in memory. */ | |
8005 | ||
8006 | static int | |
8007 | arm_return_in_memory (struct gdbarch *gdbarch, struct type *type) | |
8008 | { | |
cca44b1b JB |
8009 | enum type_code code; |
8010 | ||
f168693b | 8011 | type = check_typedef (type); |
cca44b1b | 8012 | |
b13c8ab2 YQ |
8013 | /* Simple, non-aggregate types (ie not including vectors and |
8014 | complex) are always returned in a register (or registers). */ | |
78134374 | 8015 | code = type->code (); |
b13c8ab2 YQ |
8016 | if (TYPE_CODE_STRUCT != code && TYPE_CODE_UNION != code |
8017 | && TYPE_CODE_ARRAY != code && TYPE_CODE_COMPLEX != code) | |
8018 | return 0; | |
cca44b1b | 8019 | |
bd63c870 | 8020 | if (TYPE_CODE_ARRAY == code && type->is_vector ()) |
c4312b19 YQ |
8021 | { |
8022 | /* Vector values should be returned using ARM registers if they | |
8023 | are not over 16 bytes. */ | |
8024 | return (TYPE_LENGTH (type) > 16); | |
8025 | } | |
8026 | ||
b13c8ab2 | 8027 | if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS) |
cca44b1b | 8028 | { |
b13c8ab2 YQ |
8029 | /* The AAPCS says all aggregates not larger than a word are returned |
8030 | in a register. */ | |
f0452268 | 8031 | if (TYPE_LENGTH (type) <= ARM_INT_REGISTER_SIZE) |
b13c8ab2 YQ |
8032 | return 0; |
8033 | ||
cca44b1b JB |
8034 | return 1; |
8035 | } | |
b13c8ab2 YQ |
8036 | else |
8037 | { | |
8038 | int nRc; | |
cca44b1b | 8039 | |
b13c8ab2 YQ |
8040 | /* All aggregate types that won't fit in a register must be returned |
8041 | in memory. */ | |
f0452268 | 8042 | if (TYPE_LENGTH (type) > ARM_INT_REGISTER_SIZE) |
b13c8ab2 | 8043 | return 1; |
cca44b1b | 8044 | |
b13c8ab2 YQ |
8045 | /* In the ARM ABI, "integer" like aggregate types are returned in |
8046 | registers. For an aggregate type to be integer like, its size | |
f0452268 | 8047 | must be less than or equal to ARM_INT_REGISTER_SIZE and the |
b13c8ab2 YQ |
8048 | offset of each addressable subfield must be zero. Note that bit |
8049 | fields are not addressable, and all addressable subfields of | |
8050 | unions always start at offset zero. | |
cca44b1b | 8051 | |
b13c8ab2 YQ |
8052 | This function is based on the behaviour of GCC 2.95.1. |
8053 | See: gcc/arm.c: arm_return_in_memory() for details. | |
cca44b1b | 8054 | |
b13c8ab2 YQ |
8055 | Note: All versions of GCC before GCC 2.95.2 do not set up the |
8056 | parameters correctly for a function returning the following | |
8057 | structure: struct { float f;}; This should be returned in memory, | |
8058 | not a register. Richard Earnshaw sent me a patch, but I do not | |
8059 | know of any way to detect if a function like the above has been | |
8060 | compiled with the correct calling convention. */ | |
8061 | ||
8062 | /* Assume all other aggregate types can be returned in a register. | |
8063 | Run a check for structures, unions and arrays. */ | |
8064 | nRc = 0; | |
67255d04 | 8065 | |
b13c8ab2 YQ |
8066 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) |
8067 | { | |
8068 | int i; | |
8069 | /* Need to check if this struct/union is "integer" like. For | |
8070 | this to be true, its size must be less than or equal to | |
f0452268 | 8071 | ARM_INT_REGISTER_SIZE and the offset of each addressable |
b13c8ab2 YQ |
8072 | subfield must be zero. Note that bit fields are not |
8073 | addressable, and unions always start at offset zero. If any | |
8074 | of the subfields is a floating point type, the struct/union | |
8075 | cannot be an integer type. */ | |
8076 | ||
8077 | /* For each field in the object, check: | |
8078 | 1) Is it FP? --> yes, nRc = 1; | |
8079 | 2) Is it addressable (bitpos != 0) and | |
8080 | not packed (bitsize == 0)? | |
8081 | --> yes, nRc = 1 | |
8082 | */ | |
8083 | ||
1f704f76 | 8084 | for (i = 0; i < type->num_fields (); i++) |
67255d04 | 8085 | { |
b13c8ab2 YQ |
8086 | enum type_code field_type_code; |
8087 | ||
8088 | field_type_code | |
940da03e | 8089 | = check_typedef (type->field (i).type ())->code (); |
b13c8ab2 YQ |
8090 | |
8091 | /* Is it a floating point type field? */ | |
8092 | if (field_type_code == TYPE_CODE_FLT) | |
67255d04 RE |
8093 | { |
8094 | nRc = 1; | |
8095 | break; | |
8096 | } | |
b13c8ab2 YQ |
8097 | |
8098 | /* If bitpos != 0, then we have to care about it. */ | |
8099 | if (TYPE_FIELD_BITPOS (type, i) != 0) | |
8100 | { | |
8101 | /* Bitfields are not addressable. If the field bitsize is | |
8102 | zero, then the field is not packed. Hence it cannot be | |
8103 | a bitfield or any other packed type. */ | |
8104 | if (TYPE_FIELD_BITSIZE (type, i) == 0) | |
8105 | { | |
8106 | nRc = 1; | |
8107 | break; | |
8108 | } | |
8109 | } | |
67255d04 RE |
8110 | } |
8111 | } | |
67255d04 | 8112 | |
b13c8ab2 YQ |
8113 | return nRc; |
8114 | } | |
67255d04 RE |
8115 | } |
8116 | ||
34e8f22d RE |
8117 | /* Write into appropriate registers a function return value of type |
8118 | TYPE, given in virtual format. */ | |
8119 | ||
8120 | static void | |
b508a996 | 8121 | arm_store_return_value (struct type *type, struct regcache *regs, |
5238cf52 | 8122 | const gdb_byte *valbuf) |
34e8f22d | 8123 | { |
ac7936df | 8124 | struct gdbarch *gdbarch = regs->arch (); |
e17a4113 | 8125 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
be8626e0 | 8126 | |
78134374 | 8127 | if (type->code () == TYPE_CODE_FLT) |
34e8f22d | 8128 | { |
f0452268 | 8129 | gdb_byte buf[ARM_FP_REGISTER_SIZE]; |
34e8f22d | 8130 | |
be8626e0 | 8131 | switch (gdbarch_tdep (gdbarch)->fp_model) |
08216dd7 RE |
8132 | { |
8133 | case ARM_FLOAT_FPA: | |
8134 | ||
3b2ca824 | 8135 | target_float_convert (valbuf, type, buf, arm_ext_type (gdbarch)); |
b66f5587 | 8136 | regs->cooked_write (ARM_F0_REGNUM, buf); |
08216dd7 RE |
8137 | break; |
8138 | ||
fd50bc42 | 8139 | case ARM_FLOAT_SOFT_FPA: |
08216dd7 | 8140 | case ARM_FLOAT_SOFT_VFP: |
90445bd3 DJ |
8141 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
8142 | not using the VFP ABI code. */ | |
8143 | case ARM_FLOAT_VFP: | |
b66f5587 | 8144 | regs->cooked_write (ARM_A1_REGNUM, valbuf); |
b508a996 | 8145 | if (TYPE_LENGTH (type) > 4) |
f0452268 AH |
8146 | regs->cooked_write (ARM_A1_REGNUM + 1, |
8147 | valbuf + ARM_INT_REGISTER_SIZE); | |
08216dd7 RE |
8148 | break; |
8149 | ||
8150 | default: | |
9b20d036 MS |
8151 | internal_error (__FILE__, __LINE__, |
8152 | _("arm_store_return_value: Floating " | |
8153 | "point model not supported")); | |
08216dd7 RE |
8154 | break; |
8155 | } | |
34e8f22d | 8156 | } |
78134374 SM |
8157 | else if (type->code () == TYPE_CODE_INT |
8158 | || type->code () == TYPE_CODE_CHAR | |
8159 | || type->code () == TYPE_CODE_BOOL | |
8160 | || type->code () == TYPE_CODE_PTR | |
aa006118 | 8161 | || TYPE_IS_REFERENCE (type) |
78134374 | 8162 | || type->code () == TYPE_CODE_ENUM) |
b508a996 RE |
8163 | { |
8164 | if (TYPE_LENGTH (type) <= 4) | |
8165 | { | |
8166 | /* Values of one word or less are zero/sign-extended and | |
8167 | returned in r0. */ | |
f0452268 | 8168 | bfd_byte tmpbuf[ARM_INT_REGISTER_SIZE]; |
b508a996 RE |
8169 | LONGEST val = unpack_long (type, valbuf); |
8170 | ||
f0452268 | 8171 | store_signed_integer (tmpbuf, ARM_INT_REGISTER_SIZE, byte_order, val); |
b66f5587 | 8172 | regs->cooked_write (ARM_A1_REGNUM, tmpbuf); |
b508a996 RE |
8173 | } |
8174 | else | |
8175 | { | |
8176 | /* Integral values greater than one word are stored in consecutive | |
8177 | registers starting with r0. This will always be a multiple of | |
8178 | the regiser size. */ | |
8179 | int len = TYPE_LENGTH (type); | |
8180 | int regno = ARM_A1_REGNUM; | |
8181 | ||
8182 | while (len > 0) | |
8183 | { | |
b66f5587 | 8184 | regs->cooked_write (regno++, valbuf); |
f0452268 AH |
8185 | len -= ARM_INT_REGISTER_SIZE; |
8186 | valbuf += ARM_INT_REGISTER_SIZE; | |
b508a996 RE |
8187 | } |
8188 | } | |
8189 | } | |
34e8f22d | 8190 | else |
b508a996 RE |
8191 | { |
8192 | /* For a structure or union the behaviour is as if the value had | |
8193 | been stored to word-aligned memory and then loaded into | |
8194 | registers with 32-bit load instruction(s). */ | |
8195 | int len = TYPE_LENGTH (type); | |
8196 | int regno = ARM_A1_REGNUM; | |
f0452268 | 8197 | bfd_byte tmpbuf[ARM_INT_REGISTER_SIZE]; |
b508a996 RE |
8198 | |
8199 | while (len > 0) | |
8200 | { | |
8201 | memcpy (tmpbuf, valbuf, | |
f0452268 | 8202 | len > ARM_INT_REGISTER_SIZE ? ARM_INT_REGISTER_SIZE : len); |
b66f5587 | 8203 | regs->cooked_write (regno++, tmpbuf); |
f0452268 AH |
8204 | len -= ARM_INT_REGISTER_SIZE; |
8205 | valbuf += ARM_INT_REGISTER_SIZE; | |
b508a996 RE |
8206 | } |
8207 | } | |
34e8f22d RE |
8208 | } |
8209 | ||
2af48f68 PB |
8210 | |
8211 | /* Handle function return values. */ | |
8212 | ||
8213 | static enum return_value_convention | |
6a3a010b | 8214 | arm_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
8215 | struct type *valtype, struct regcache *regcache, |
8216 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2af48f68 | 8217 | { |
7c00367c | 8218 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
6a3a010b | 8219 | struct type *func_type = function ? value_type (function) : NULL; |
90445bd3 DJ |
8220 | enum arm_vfp_cprc_base_type vfp_base_type; |
8221 | int vfp_base_count; | |
8222 | ||
8223 | if (arm_vfp_abi_for_function (gdbarch, func_type) | |
8224 | && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count)) | |
8225 | { | |
8226 | int reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
8227 | int unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
8228 | int i; | |
8229 | for (i = 0; i < vfp_base_count; i++) | |
8230 | { | |
58d6951d DJ |
8231 | if (reg_char == 'q') |
8232 | { | |
8233 | if (writebuf) | |
8234 | arm_neon_quad_write (gdbarch, regcache, i, | |
8235 | writebuf + i * unit_length); | |
8236 | ||
8237 | if (readbuf) | |
8238 | arm_neon_quad_read (gdbarch, regcache, i, | |
8239 | readbuf + i * unit_length); | |
8240 | } | |
8241 | else | |
8242 | { | |
8243 | char name_buf[4]; | |
8244 | int regnum; | |
8245 | ||
8c042590 | 8246 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", reg_char, i); |
58d6951d DJ |
8247 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
8248 | strlen (name_buf)); | |
8249 | if (writebuf) | |
b66f5587 | 8250 | regcache->cooked_write (regnum, writebuf + i * unit_length); |
58d6951d | 8251 | if (readbuf) |
dca08e1f | 8252 | regcache->cooked_read (regnum, readbuf + i * unit_length); |
58d6951d | 8253 | } |
90445bd3 DJ |
8254 | } |
8255 | return RETURN_VALUE_REGISTER_CONVENTION; | |
8256 | } | |
7c00367c | 8257 | |
78134374 SM |
8258 | if (valtype->code () == TYPE_CODE_STRUCT |
8259 | || valtype->code () == TYPE_CODE_UNION | |
8260 | || valtype->code () == TYPE_CODE_ARRAY) | |
2af48f68 | 8261 | { |
7c00367c MK |
8262 | if (tdep->struct_return == pcc_struct_return |
8263 | || arm_return_in_memory (gdbarch, valtype)) | |
2af48f68 PB |
8264 | return RETURN_VALUE_STRUCT_CONVENTION; |
8265 | } | |
78134374 | 8266 | else if (valtype->code () == TYPE_CODE_COMPLEX) |
b13c8ab2 YQ |
8267 | { |
8268 | if (arm_return_in_memory (gdbarch, valtype)) | |
8269 | return RETURN_VALUE_STRUCT_CONVENTION; | |
8270 | } | |
7052e42c | 8271 | |
2af48f68 PB |
8272 | if (writebuf) |
8273 | arm_store_return_value (valtype, regcache, writebuf); | |
8274 | ||
8275 | if (readbuf) | |
8276 | arm_extract_return_value (valtype, regcache, readbuf); | |
8277 | ||
8278 | return RETURN_VALUE_REGISTER_CONVENTION; | |
8279 | } | |
8280 | ||
8281 | ||
9df628e0 | 8282 | static int |
60ade65d | 8283 | arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
9df628e0 | 8284 | { |
e17a4113 UW |
8285 | struct gdbarch *gdbarch = get_frame_arch (frame); |
8286 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
8287 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
9df628e0 | 8288 | CORE_ADDR jb_addr; |
f0452268 | 8289 | gdb_byte buf[ARM_INT_REGISTER_SIZE]; |
9df628e0 | 8290 | |
60ade65d | 8291 | jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM); |
9df628e0 RE |
8292 | |
8293 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, | |
f0452268 | 8294 | ARM_INT_REGISTER_SIZE)) |
9df628e0 RE |
8295 | return 0; |
8296 | ||
f0452268 | 8297 | *pc = extract_unsigned_integer (buf, ARM_INT_REGISTER_SIZE, byte_order); |
9df628e0 RE |
8298 | return 1; |
8299 | } | |
40eadf04 SP |
8300 | /* A call to cmse secure entry function "foo" at "a" is modified by |
8301 | GNU ld as "b". | |
8302 | a) bl xxxx <foo> | |
8303 | ||
8304 | <foo> | |
8305 | xxxx: | |
8306 | ||
8307 | b) bl yyyy <__acle_se_foo> | |
8308 | ||
8309 | section .gnu.sgstubs: | |
8310 | <foo> | |
8311 | yyyy: sg // secure gateway | |
8312 | b.w xxxx <__acle_se_foo> // original_branch_dest | |
8313 | ||
8314 | <__acle_se_foo> | |
8315 | xxxx: | |
8316 | ||
8317 | When the control at "b", the pc contains "yyyy" (sg address) which is a | |
8318 | trampoline and does not exist in source code. This function returns the | |
8319 | target pc "xxxx". For more details please refer to section 5.4 | |
8320 | (Entry functions) and section 3.4.4 (C level development flow of secure code) | |
8321 | of "armv8-m-security-extensions-requirements-on-development-tools-engineering-specification" | |
8322 | document on www.developer.arm.com. */ | |
8323 | ||
8324 | static CORE_ADDR | |
8325 | arm_skip_cmse_entry (CORE_ADDR pc, const char *name, struct objfile *objfile) | |
8326 | { | |
8327 | int target_len = strlen (name) + strlen ("__acle_se_") + 1; | |
8328 | char *target_name = (char *) alloca (target_len); | |
8329 | xsnprintf (target_name, target_len, "%s%s", "__acle_se_", name); | |
8330 | ||
8331 | struct bound_minimal_symbol minsym | |
8332 | = lookup_minimal_symbol (target_name, NULL, objfile); | |
8333 | ||
8334 | if (minsym.minsym != nullptr) | |
8335 | return BMSYMBOL_VALUE_ADDRESS (minsym); | |
8336 | ||
8337 | return 0; | |
8338 | } | |
8339 | ||
8340 | /* Return true when SEC points to ".gnu.sgstubs" section. */ | |
8341 | ||
8342 | static bool | |
8343 | arm_is_sgstubs_section (struct obj_section *sec) | |
8344 | { | |
8345 | return (sec != nullptr | |
8346 | && sec->the_bfd_section != nullptr | |
8347 | && sec->the_bfd_section->name != nullptr | |
8348 | && streq (sec->the_bfd_section->name, ".gnu.sgstubs")); | |
8349 | } | |
9df628e0 | 8350 | |
faa95490 DJ |
8351 | /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, |
8352 | return the target PC. Otherwise return 0. */ | |
c906108c SS |
8353 | |
8354 | CORE_ADDR | |
52f729a7 | 8355 | arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 8356 | { |
2c02bd72 | 8357 | const char *name; |
faa95490 | 8358 | int namelen; |
c906108c SS |
8359 | CORE_ADDR start_addr; |
8360 | ||
8361 | /* Find the starting address and name of the function containing the PC. */ | |
8362 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) | |
80d8d390 YQ |
8363 | { |
8364 | /* Trampoline 'bx reg' doesn't belong to any functions. Do the | |
8365 | check here. */ | |
8366 | start_addr = arm_skip_bx_reg (frame, pc); | |
8367 | if (start_addr != 0) | |
8368 | return start_addr; | |
8369 | ||
8370 | return 0; | |
8371 | } | |
c906108c | 8372 | |
faa95490 DJ |
8373 | /* If PC is in a Thumb call or return stub, return the address of the |
8374 | target PC, which is in a register. The thunk functions are called | |
8375 | _call_via_xx, where x is the register name. The possible names | |
3d8d5e79 DJ |
8376 | are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar |
8377 | functions, named __ARM_call_via_r[0-7]. */ | |
61012eef GB |
8378 | if (startswith (name, "_call_via_") |
8379 | || startswith (name, "__ARM_call_via_")) | |
c906108c | 8380 | { |
ed9a39eb JM |
8381 | /* Use the name suffix to determine which register contains the |
8382 | target PC. */ | |
a121b7c1 | 8383 | static const char *table[15] = |
c5aa993b JM |
8384 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
8385 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" | |
8386 | }; | |
c906108c | 8387 | int regno; |
faa95490 | 8388 | int offset = strlen (name) - 2; |
c906108c SS |
8389 | |
8390 | for (regno = 0; regno <= 14; regno++) | |
faa95490 | 8391 | if (strcmp (&name[offset], table[regno]) == 0) |
52f729a7 | 8392 | return get_frame_register_unsigned (frame, regno); |
c906108c | 8393 | } |
ed9a39eb | 8394 | |
faa95490 DJ |
8395 | /* GNU ld generates __foo_from_arm or __foo_from_thumb for |
8396 | non-interworking calls to foo. We could decode the stubs | |
8397 | to find the target but it's easier to use the symbol table. */ | |
8398 | namelen = strlen (name); | |
8399 | if (name[0] == '_' && name[1] == '_' | |
8400 | && ((namelen > 2 + strlen ("_from_thumb") | |
61012eef | 8401 | && startswith (name + namelen - strlen ("_from_thumb"), "_from_thumb")) |
faa95490 | 8402 | || (namelen > 2 + strlen ("_from_arm") |
61012eef | 8403 | && startswith (name + namelen - strlen ("_from_arm"), "_from_arm")))) |
faa95490 DJ |
8404 | { |
8405 | char *target_name; | |
8406 | int target_len = namelen - 2; | |
3b7344d5 | 8407 | struct bound_minimal_symbol minsym; |
faa95490 DJ |
8408 | struct objfile *objfile; |
8409 | struct obj_section *sec; | |
8410 | ||
8411 | if (name[namelen - 1] == 'b') | |
8412 | target_len -= strlen ("_from_thumb"); | |
8413 | else | |
8414 | target_len -= strlen ("_from_arm"); | |
8415 | ||
224c3ddb | 8416 | target_name = (char *) alloca (target_len + 1); |
faa95490 DJ |
8417 | memcpy (target_name, name + 2, target_len); |
8418 | target_name[target_len] = '\0'; | |
8419 | ||
8420 | sec = find_pc_section (pc); | |
8421 | objfile = (sec == NULL) ? NULL : sec->objfile; | |
8422 | minsym = lookup_minimal_symbol (target_name, NULL, objfile); | |
3b7344d5 | 8423 | if (minsym.minsym != NULL) |
77e371c0 | 8424 | return BMSYMBOL_VALUE_ADDRESS (minsym); |
faa95490 DJ |
8425 | else |
8426 | return 0; | |
8427 | } | |
8428 | ||
40eadf04 SP |
8429 | struct obj_section *section = find_pc_section (pc); |
8430 | ||
8431 | /* Check whether SECTION points to the ".gnu.sgstubs" section. */ | |
8432 | if (arm_is_sgstubs_section (section)) | |
8433 | return arm_skip_cmse_entry (pc, name, section->objfile); | |
8434 | ||
c5aa993b | 8435 | return 0; /* not a stub */ |
c906108c SS |
8436 | } |
8437 | ||
28e97307 DJ |
8438 | static void |
8439 | arm_update_current_architecture (void) | |
fd50bc42 | 8440 | { |
28e97307 | 8441 | struct gdbarch_info info; |
fd50bc42 | 8442 | |
28e97307 | 8443 | /* If the current architecture is not ARM, we have nothing to do. */ |
f5656ead | 8444 | if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_arm) |
28e97307 | 8445 | return; |
fd50bc42 | 8446 | |
28e97307 DJ |
8447 | /* Update the architecture. */ |
8448 | gdbarch_info_init (&info); | |
fd50bc42 | 8449 | |
28e97307 | 8450 | if (!gdbarch_update_p (info)) |
9b20d036 | 8451 | internal_error (__FILE__, __LINE__, _("could not update architecture")); |
fd50bc42 RE |
8452 | } |
8453 | ||
8454 | static void | |
eb4c3f4a | 8455 | set_fp_model_sfunc (const char *args, int from_tty, |
fd50bc42 RE |
8456 | struct cmd_list_element *c) |
8457 | { | |
570dc176 | 8458 | int fp_model; |
fd50bc42 RE |
8459 | |
8460 | for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++) | |
8461 | if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0) | |
8462 | { | |
aead7601 | 8463 | arm_fp_model = (enum arm_float_model) fp_model; |
fd50bc42 RE |
8464 | break; |
8465 | } | |
8466 | ||
8467 | if (fp_model == ARM_FLOAT_LAST) | |
edefbb7c | 8468 | internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."), |
fd50bc42 RE |
8469 | current_fp_model); |
8470 | ||
28e97307 | 8471 | arm_update_current_architecture (); |
fd50bc42 RE |
8472 | } |
8473 | ||
8474 | static void | |
08546159 AC |
8475 | show_fp_model (struct ui_file *file, int from_tty, |
8476 | struct cmd_list_element *c, const char *value) | |
fd50bc42 | 8477 | { |
f5656ead | 8478 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
fd50bc42 | 8479 | |
28e97307 | 8480 | if (arm_fp_model == ARM_FLOAT_AUTO |
f5656ead | 8481 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
8482 | fprintf_filtered (file, _("\ |
8483 | The current ARM floating point model is \"auto\" (currently \"%s\").\n"), | |
8484 | fp_model_strings[tdep->fp_model]); | |
8485 | else | |
8486 | fprintf_filtered (file, _("\ | |
8487 | The current ARM floating point model is \"%s\".\n"), | |
8488 | fp_model_strings[arm_fp_model]); | |
8489 | } | |
8490 | ||
8491 | static void | |
eb4c3f4a | 8492 | arm_set_abi (const char *args, int from_tty, |
28e97307 DJ |
8493 | struct cmd_list_element *c) |
8494 | { | |
570dc176 | 8495 | int arm_abi; |
28e97307 DJ |
8496 | |
8497 | for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++) | |
8498 | if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0) | |
8499 | { | |
aead7601 | 8500 | arm_abi_global = (enum arm_abi_kind) arm_abi; |
28e97307 DJ |
8501 | break; |
8502 | } | |
8503 | ||
8504 | if (arm_abi == ARM_ABI_LAST) | |
8505 | internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."), | |
8506 | arm_abi_string); | |
8507 | ||
8508 | arm_update_current_architecture (); | |
8509 | } | |
8510 | ||
8511 | static void | |
8512 | arm_show_abi (struct ui_file *file, int from_tty, | |
8513 | struct cmd_list_element *c, const char *value) | |
8514 | { | |
f5656ead | 8515 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
28e97307 DJ |
8516 | |
8517 | if (arm_abi_global == ARM_ABI_AUTO | |
f5656ead | 8518 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
8519 | fprintf_filtered (file, _("\ |
8520 | The current ARM ABI is \"auto\" (currently \"%s\").\n"), | |
8521 | arm_abi_strings[tdep->arm_abi]); | |
8522 | else | |
8523 | fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"), | |
8524 | arm_abi_string); | |
fd50bc42 RE |
8525 | } |
8526 | ||
0428b8f5 DJ |
8527 | static void |
8528 | arm_show_fallback_mode (struct ui_file *file, int from_tty, | |
8529 | struct cmd_list_element *c, const char *value) | |
8530 | { | |
0963b4bd MS |
8531 | fprintf_filtered (file, |
8532 | _("The current execution mode assumed " | |
8533 | "(when symbols are unavailable) is \"%s\".\n"), | |
0428b8f5 DJ |
8534 | arm_fallback_mode_string); |
8535 | } | |
8536 | ||
8537 | static void | |
8538 | arm_show_force_mode (struct ui_file *file, int from_tty, | |
8539 | struct cmd_list_element *c, const char *value) | |
8540 | { | |
0963b4bd MS |
8541 | fprintf_filtered (file, |
8542 | _("The current execution mode assumed " | |
8543 | "(even when symbols are available) is \"%s\".\n"), | |
0428b8f5 DJ |
8544 | arm_force_mode_string); |
8545 | } | |
8546 | ||
afd7eef0 RE |
8547 | /* If the user changes the register disassembly style used for info |
8548 | register and other commands, we have to also switch the style used | |
8549 | in opcodes for disassembly output. This function is run in the "set | |
8550 | arm disassembly" command, and does that. */ | |
bc90b915 FN |
8551 | |
8552 | static void | |
eb4c3f4a | 8553 | set_disassembly_style_sfunc (const char *args, int from_tty, |
65b48a81 | 8554 | struct cmd_list_element *c) |
bc90b915 | 8555 | { |
65b48a81 PB |
8556 | /* Convert the short style name into the long style name (eg, reg-names-*) |
8557 | before calling the generic set_disassembler_options() function. */ | |
8558 | std::string long_name = std::string ("reg-names-") + disassembly_style; | |
8559 | set_disassembler_options (&long_name[0]); | |
8560 | } | |
8561 | ||
8562 | static void | |
8563 | show_disassembly_style_sfunc (struct ui_file *file, int from_tty, | |
8564 | struct cmd_list_element *c, const char *value) | |
8565 | { | |
8566 | struct gdbarch *gdbarch = get_current_arch (); | |
8567 | char *options = get_disassembler_options (gdbarch); | |
8568 | const char *style = ""; | |
8569 | int len = 0; | |
f995bbe8 | 8570 | const char *opt; |
65b48a81 PB |
8571 | |
8572 | FOR_EACH_DISASSEMBLER_OPTION (opt, options) | |
8573 | if (CONST_STRNEQ (opt, "reg-names-")) | |
8574 | { | |
8575 | style = &opt[strlen ("reg-names-")]; | |
8576 | len = strcspn (style, ","); | |
8577 | } | |
8578 | ||
8579 | fprintf_unfiltered (file, "The disassembly style is \"%.*s\".\n", len, style); | |
bc90b915 FN |
8580 | } |
8581 | \f | |
966fbf70 | 8582 | /* Return the ARM register name corresponding to register I. */ |
a208b0cb | 8583 | static const char * |
d93859e2 | 8584 | arm_register_name (struct gdbarch *gdbarch, int i) |
966fbf70 | 8585 | { |
58d6951d DJ |
8586 | const int num_regs = gdbarch_num_regs (gdbarch); |
8587 | ||
8588 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
8589 | && i >= num_regs && i < num_regs + 32) | |
8590 | { | |
8591 | static const char *const vfp_pseudo_names[] = { | |
8592 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", | |
8593 | "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", | |
8594 | "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", | |
8595 | "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", | |
8596 | }; | |
8597 | ||
8598 | return vfp_pseudo_names[i - num_regs]; | |
8599 | } | |
8600 | ||
8601 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
8602 | && i >= num_regs + 32 && i < num_regs + 32 + 16) | |
8603 | { | |
8604 | static const char *const neon_pseudo_names[] = { | |
8605 | "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", | |
8606 | "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15", | |
8607 | }; | |
8608 | ||
8609 | return neon_pseudo_names[i - num_regs - 32]; | |
8610 | } | |
8611 | ||
ff6f572f DJ |
8612 | if (i >= ARRAY_SIZE (arm_register_names)) |
8613 | /* These registers are only supported on targets which supply | |
8614 | an XML description. */ | |
8615 | return ""; | |
8616 | ||
966fbf70 RE |
8617 | return arm_register_names[i]; |
8618 | } | |
8619 | ||
082fc60d RE |
8620 | /* Test whether the coff symbol specific value corresponds to a Thumb |
8621 | function. */ | |
8622 | ||
8623 | static int | |
8624 | coff_sym_is_thumb (int val) | |
8625 | { | |
f8bf5763 PM |
8626 | return (val == C_THUMBEXT |
8627 | || val == C_THUMBSTAT | |
8628 | || val == C_THUMBEXTFUNC | |
8629 | || val == C_THUMBSTATFUNC | |
8630 | || val == C_THUMBLABEL); | |
082fc60d RE |
8631 | } |
8632 | ||
8633 | /* arm_coff_make_msymbol_special() | |
8634 | arm_elf_make_msymbol_special() | |
8635 | ||
8636 | These functions test whether the COFF or ELF symbol corresponds to | |
8637 | an address in thumb code, and set a "special" bit in a minimal | |
8638 | symbol to indicate that it does. */ | |
8639 | ||
34e8f22d | 8640 | static void |
082fc60d RE |
8641 | arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym) |
8642 | { | |
39d911fc TP |
8643 | elf_symbol_type *elfsym = (elf_symbol_type *) sym; |
8644 | ||
8645 | if (ARM_GET_SYM_BRANCH_TYPE (elfsym->internal_elf_sym.st_target_internal) | |
467d42c4 | 8646 | == ST_BRANCH_TO_THUMB) |
082fc60d RE |
8647 | MSYMBOL_SET_SPECIAL (msym); |
8648 | } | |
8649 | ||
34e8f22d | 8650 | static void |
082fc60d RE |
8651 | arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym) |
8652 | { | |
8653 | if (coff_sym_is_thumb (val)) | |
8654 | MSYMBOL_SET_SPECIAL (msym); | |
8655 | } | |
8656 | ||
60c5725c DJ |
8657 | static void |
8658 | arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile, | |
8659 | asymbol *sym) | |
8660 | { | |
8661 | const char *name = bfd_asymbol_name (sym); | |
bd5766ec | 8662 | struct arm_per_bfd *data; |
60c5725c DJ |
8663 | struct arm_mapping_symbol new_map_sym; |
8664 | ||
8665 | gdb_assert (name[0] == '$'); | |
8666 | if (name[1] != 'a' && name[1] != 't' && name[1] != 'd') | |
8667 | return; | |
8668 | ||
bd5766ec | 8669 | data = arm_bfd_data_key.get (objfile->obfd); |
60c5725c | 8670 | if (data == NULL) |
bd5766ec LM |
8671 | data = arm_bfd_data_key.emplace (objfile->obfd, |
8672 | objfile->obfd->section_count); | |
54cc7474 | 8673 | arm_mapping_symbol_vec &map |
e6f7f6d1 | 8674 | = data->section_maps[bfd_asymbol_section (sym)->index]; |
60c5725c DJ |
8675 | |
8676 | new_map_sym.value = sym->value; | |
8677 | new_map_sym.type = name[1]; | |
8678 | ||
4838e44c SM |
8679 | /* Insert at the end, the vector will be sorted on first use. */ |
8680 | map.push_back (new_map_sym); | |
60c5725c DJ |
8681 | } |
8682 | ||
756fe439 | 8683 | static void |
61a1198a | 8684 | arm_write_pc (struct regcache *regcache, CORE_ADDR pc) |
756fe439 | 8685 | { |
ac7936df | 8686 | struct gdbarch *gdbarch = regcache->arch (); |
61a1198a | 8687 | regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc); |
756fe439 DJ |
8688 | |
8689 | /* If necessary, set the T bit. */ | |
8690 | if (arm_apcs_32) | |
8691 | { | |
9779414d | 8692 | ULONGEST val, t_bit; |
61a1198a | 8693 | regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val); |
9779414d DJ |
8694 | t_bit = arm_psr_thumb_bit (gdbarch); |
8695 | if (arm_pc_is_thumb (gdbarch, pc)) | |
8696 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, | |
8697 | val | t_bit); | |
756fe439 | 8698 | else |
61a1198a | 8699 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
9779414d | 8700 | val & ~t_bit); |
756fe439 DJ |
8701 | } |
8702 | } | |
123dc839 | 8703 | |
58d6951d DJ |
8704 | /* Read the contents of a NEON quad register, by reading from two |
8705 | double registers. This is used to implement the quad pseudo | |
8706 | registers, and for argument passing in case the quad registers are | |
8707 | missing; vectors are passed in quad registers when using the VFP | |
8708 | ABI, even if a NEON unit is not present. REGNUM is the index of | |
8709 | the quad register, in [0, 15]. */ | |
8710 | ||
05d1431c | 8711 | static enum register_status |
849d0ba8 | 8712 | arm_neon_quad_read (struct gdbarch *gdbarch, readable_regcache *regcache, |
58d6951d DJ |
8713 | int regnum, gdb_byte *buf) |
8714 | { | |
8715 | char name_buf[4]; | |
8716 | gdb_byte reg_buf[8]; | |
8717 | int offset, double_regnum; | |
05d1431c | 8718 | enum register_status status; |
58d6951d | 8719 | |
8c042590 | 8720 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
8721 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
8722 | strlen (name_buf)); | |
8723 | ||
8724 | /* d0 is always the least significant half of q0. */ | |
8725 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
8726 | offset = 8; | |
8727 | else | |
8728 | offset = 0; | |
8729 | ||
03f50fc8 | 8730 | status = regcache->raw_read (double_regnum, reg_buf); |
05d1431c PA |
8731 | if (status != REG_VALID) |
8732 | return status; | |
58d6951d DJ |
8733 | memcpy (buf + offset, reg_buf, 8); |
8734 | ||
8735 | offset = 8 - offset; | |
03f50fc8 | 8736 | status = regcache->raw_read (double_regnum + 1, reg_buf); |
05d1431c PA |
8737 | if (status != REG_VALID) |
8738 | return status; | |
58d6951d | 8739 | memcpy (buf + offset, reg_buf, 8); |
05d1431c PA |
8740 | |
8741 | return REG_VALID; | |
58d6951d DJ |
8742 | } |
8743 | ||
05d1431c | 8744 | static enum register_status |
849d0ba8 | 8745 | arm_pseudo_read (struct gdbarch *gdbarch, readable_regcache *regcache, |
58d6951d DJ |
8746 | int regnum, gdb_byte *buf) |
8747 | { | |
8748 | const int num_regs = gdbarch_num_regs (gdbarch); | |
8749 | char name_buf[4]; | |
8750 | gdb_byte reg_buf[8]; | |
8751 | int offset, double_regnum; | |
8752 | ||
8753 | gdb_assert (regnum >= num_regs); | |
8754 | regnum -= num_regs; | |
8755 | ||
8756 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
8757 | /* Quad-precision register. */ | |
05d1431c | 8758 | return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf); |
58d6951d DJ |
8759 | else |
8760 | { | |
05d1431c PA |
8761 | enum register_status status; |
8762 | ||
58d6951d DJ |
8763 | /* Single-precision register. */ |
8764 | gdb_assert (regnum < 32); | |
8765 | ||
8766 | /* s0 is always the least significant half of d0. */ | |
8767 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
8768 | offset = (regnum & 1) ? 0 : 4; | |
8769 | else | |
8770 | offset = (regnum & 1) ? 4 : 0; | |
8771 | ||
8c042590 | 8772 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
8773 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
8774 | strlen (name_buf)); | |
8775 | ||
03f50fc8 | 8776 | status = regcache->raw_read (double_regnum, reg_buf); |
05d1431c PA |
8777 | if (status == REG_VALID) |
8778 | memcpy (buf, reg_buf + offset, 4); | |
8779 | return status; | |
58d6951d DJ |
8780 | } |
8781 | } | |
8782 | ||
8783 | /* Store the contents of BUF to a NEON quad register, by writing to | |
8784 | two double registers. This is used to implement the quad pseudo | |
8785 | registers, and for argument passing in case the quad registers are | |
8786 | missing; vectors are passed in quad registers when using the VFP | |
8787 | ABI, even if a NEON unit is not present. REGNUM is the index | |
8788 | of the quad register, in [0, 15]. */ | |
8789 | ||
8790 | static void | |
8791 | arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
8792 | int regnum, const gdb_byte *buf) | |
8793 | { | |
8794 | char name_buf[4]; | |
58d6951d DJ |
8795 | int offset, double_regnum; |
8796 | ||
8c042590 | 8797 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
8798 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
8799 | strlen (name_buf)); | |
8800 | ||
8801 | /* d0 is always the least significant half of q0. */ | |
8802 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
8803 | offset = 8; | |
8804 | else | |
8805 | offset = 0; | |
8806 | ||
10eaee5f | 8807 | regcache->raw_write (double_regnum, buf + offset); |
58d6951d | 8808 | offset = 8 - offset; |
10eaee5f | 8809 | regcache->raw_write (double_regnum + 1, buf + offset); |
58d6951d DJ |
8810 | } |
8811 | ||
8812 | static void | |
8813 | arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
8814 | int regnum, const gdb_byte *buf) | |
8815 | { | |
8816 | const int num_regs = gdbarch_num_regs (gdbarch); | |
8817 | char name_buf[4]; | |
8818 | gdb_byte reg_buf[8]; | |
8819 | int offset, double_regnum; | |
8820 | ||
8821 | gdb_assert (regnum >= num_regs); | |
8822 | regnum -= num_regs; | |
8823 | ||
8824 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
8825 | /* Quad-precision register. */ | |
8826 | arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf); | |
8827 | else | |
8828 | { | |
8829 | /* Single-precision register. */ | |
8830 | gdb_assert (regnum < 32); | |
8831 | ||
8832 | /* s0 is always the least significant half of d0. */ | |
8833 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
8834 | offset = (regnum & 1) ? 0 : 4; | |
8835 | else | |
8836 | offset = (regnum & 1) ? 4 : 0; | |
8837 | ||
8c042590 | 8838 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
8839 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
8840 | strlen (name_buf)); | |
8841 | ||
0b883586 | 8842 | regcache->raw_read (double_regnum, reg_buf); |
58d6951d | 8843 | memcpy (reg_buf + offset, buf, 4); |
10eaee5f | 8844 | regcache->raw_write (double_regnum, reg_buf); |
58d6951d DJ |
8845 | } |
8846 | } | |
8847 | ||
123dc839 DJ |
8848 | static struct value * |
8849 | value_of_arm_user_reg (struct frame_info *frame, const void *baton) | |
8850 | { | |
9a3c8263 | 8851 | const int *reg_p = (const int *) baton; |
123dc839 DJ |
8852 | return value_of_register (*reg_p, frame); |
8853 | } | |
97e03143 | 8854 | \f |
70f80edf JT |
8855 | static enum gdb_osabi |
8856 | arm_elf_osabi_sniffer (bfd *abfd) | |
97e03143 | 8857 | { |
2af48f68 | 8858 | unsigned int elfosabi; |
70f80edf | 8859 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
97e03143 | 8860 | |
70f80edf | 8861 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
97e03143 | 8862 | |
28e97307 DJ |
8863 | if (elfosabi == ELFOSABI_ARM) |
8864 | /* GNU tools use this value. Check note sections in this case, | |
8865 | as well. */ | |
b35c1d1c TT |
8866 | { |
8867 | for (asection *sect : gdb_bfd_sections (abfd)) | |
8868 | generic_elf_osabi_sniff_abi_tag_sections (abfd, sect, &osabi); | |
8869 | } | |
97e03143 | 8870 | |
28e97307 | 8871 | /* Anything else will be handled by the generic ELF sniffer. */ |
70f80edf | 8872 | return osabi; |
97e03143 RE |
8873 | } |
8874 | ||
54483882 YQ |
8875 | static int |
8876 | arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
8877 | struct reggroup *group) | |
8878 | { | |
2c291032 YQ |
8879 | /* FPS register's type is INT, but belongs to float_reggroup. Beside |
8880 | this, FPS register belongs to save_regroup, restore_reggroup, and | |
8881 | all_reggroup, of course. */ | |
54483882 | 8882 | if (regnum == ARM_FPS_REGNUM) |
2c291032 YQ |
8883 | return (group == float_reggroup |
8884 | || group == save_reggroup | |
8885 | || group == restore_reggroup | |
8886 | || group == all_reggroup); | |
54483882 YQ |
8887 | else |
8888 | return default_register_reggroup_p (gdbarch, regnum, group); | |
8889 | } | |
8890 | ||
25f8c692 JL |
8891 | /* For backward-compatibility we allow two 'g' packet lengths with |
8892 | the remote protocol depending on whether FPA registers are | |
8893 | supplied. M-profile targets do not have FPA registers, but some | |
8894 | stubs already exist in the wild which use a 'g' packet which | |
8895 | supplies them albeit with dummy values. The packet format which | |
8896 | includes FPA registers should be considered deprecated for | |
8897 | M-profile targets. */ | |
8898 | ||
8899 | static void | |
8900 | arm_register_g_packet_guesses (struct gdbarch *gdbarch) | |
8901 | { | |
8902 | if (gdbarch_tdep (gdbarch)->is_m) | |
8903 | { | |
d105cce5 AH |
8904 | const target_desc *tdesc; |
8905 | ||
25f8c692 JL |
8906 | /* If we know from the executable this is an M-profile target, |
8907 | cater for remote targets whose register set layout is the | |
8908 | same as the FPA layout. */ | |
d105cce5 | 8909 | tdesc = arm_read_mprofile_description (ARM_M_TYPE_WITH_FPA); |
25f8c692 | 8910 | register_remote_g_packet_guess (gdbarch, |
350fab54 | 8911 | ARM_CORE_REGS_SIZE + ARM_FP_REGS_SIZE, |
d105cce5 | 8912 | tdesc); |
25f8c692 JL |
8913 | |
8914 | /* The regular M-profile layout. */ | |
d105cce5 | 8915 | tdesc = arm_read_mprofile_description (ARM_M_TYPE_M_PROFILE); |
350fab54 | 8916 | register_remote_g_packet_guess (gdbarch, ARM_CORE_REGS_SIZE, |
d105cce5 | 8917 | tdesc); |
3184d3f9 JL |
8918 | |
8919 | /* M-profile plus M4F VFP. */ | |
d105cce5 | 8920 | tdesc = arm_read_mprofile_description (ARM_M_TYPE_VFP_D16); |
3184d3f9 | 8921 | register_remote_g_packet_guess (gdbarch, |
350fab54 | 8922 | ARM_CORE_REGS_SIZE + ARM_VFP2_REGS_SIZE, |
d105cce5 | 8923 | tdesc); |
25f8c692 JL |
8924 | } |
8925 | ||
8926 | /* Otherwise we don't have a useful guess. */ | |
8927 | } | |
8928 | ||
7eb89530 YQ |
8929 | /* Implement the code_of_frame_writable gdbarch method. */ |
8930 | ||
8931 | static int | |
8932 | arm_code_of_frame_writable (struct gdbarch *gdbarch, struct frame_info *frame) | |
8933 | { | |
8934 | if (gdbarch_tdep (gdbarch)->is_m | |
8935 | && get_frame_type (frame) == SIGTRAMP_FRAME) | |
8936 | { | |
8937 | /* M-profile exception frames return to some magic PCs, where | |
8938 | isn't writable at all. */ | |
8939 | return 0; | |
8940 | } | |
8941 | else | |
8942 | return 1; | |
8943 | } | |
8944 | ||
3426ae57 AH |
8945 | /* Implement gdbarch_gnu_triplet_regexp. If the arch name is arm then allow it |
8946 | to be postfixed by a version (eg armv7hl). */ | |
8947 | ||
8948 | static const char * | |
8949 | arm_gnu_triplet_regexp (struct gdbarch *gdbarch) | |
8950 | { | |
8951 | if (strcmp (gdbarch_bfd_arch_info (gdbarch)->arch_name, "arm") == 0) | |
8952 | return "arm(v[^- ]*)?"; | |
8953 | return gdbarch_bfd_arch_info (gdbarch)->arch_name; | |
8954 | } | |
8955 | ||
da3c6d4a MS |
8956 | /* Initialize the current architecture based on INFO. If possible, |
8957 | re-use an architecture from ARCHES, which is a list of | |
8958 | architectures already created during this debugging session. | |
97e03143 | 8959 | |
da3c6d4a MS |
8960 | Called e.g. at program startup, when reading a core file, and when |
8961 | reading a binary file. */ | |
97e03143 | 8962 | |
39bbf761 RE |
8963 | static struct gdbarch * |
8964 | arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
8965 | { | |
97e03143 | 8966 | struct gdbarch_tdep *tdep; |
39bbf761 | 8967 | struct gdbarch *gdbarch; |
28e97307 DJ |
8968 | struct gdbarch_list *best_arch; |
8969 | enum arm_abi_kind arm_abi = arm_abi_global; | |
8970 | enum arm_float_model fp_model = arm_fp_model; | |
c1e1314d | 8971 | tdesc_arch_data_up tdesc_data; |
7559c217 CB |
8972 | int i; |
8973 | bool is_m = false; | |
8974 | int vfp_register_count = 0; | |
8975 | bool have_vfp_pseudos = false, have_neon_pseudos = false; | |
8976 | bool have_wmmx_registers = false; | |
8977 | bool have_neon = false; | |
8978 | bool have_fpa_registers = true; | |
9779414d DJ |
8979 | const struct target_desc *tdesc = info.target_desc; |
8980 | ||
8981 | /* If we have an object to base this architecture on, try to determine | |
8982 | its ABI. */ | |
8983 | ||
8984 | if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL) | |
8985 | { | |
8986 | int ei_osabi, e_flags; | |
8987 | ||
8988 | switch (bfd_get_flavour (info.abfd)) | |
8989 | { | |
9779414d DJ |
8990 | case bfd_target_coff_flavour: |
8991 | /* Assume it's an old APCS-style ABI. */ | |
8992 | /* XXX WinCE? */ | |
8993 | arm_abi = ARM_ABI_APCS; | |
8994 | break; | |
8995 | ||
8996 | case bfd_target_elf_flavour: | |
8997 | ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI]; | |
8998 | e_flags = elf_elfheader (info.abfd)->e_flags; | |
8999 | ||
9000 | if (ei_osabi == ELFOSABI_ARM) | |
9001 | { | |
9002 | /* GNU tools used to use this value, but do not for EABI | |
9003 | objects. There's nowhere to tag an EABI version | |
9004 | anyway, so assume APCS. */ | |
9005 | arm_abi = ARM_ABI_APCS; | |
9006 | } | |
d403db27 | 9007 | else if (ei_osabi == ELFOSABI_NONE || ei_osabi == ELFOSABI_GNU) |
9779414d DJ |
9008 | { |
9009 | int eabi_ver = EF_ARM_EABI_VERSION (e_flags); | |
9779414d DJ |
9010 | |
9011 | switch (eabi_ver) | |
9012 | { | |
9013 | case EF_ARM_EABI_UNKNOWN: | |
9014 | /* Assume GNU tools. */ | |
9015 | arm_abi = ARM_ABI_APCS; | |
9016 | break; | |
9017 | ||
9018 | case EF_ARM_EABI_VER4: | |
9019 | case EF_ARM_EABI_VER5: | |
9020 | arm_abi = ARM_ABI_AAPCS; | |
9021 | /* EABI binaries default to VFP float ordering. | |
9022 | They may also contain build attributes that can | |
9023 | be used to identify if the VFP argument-passing | |
9024 | ABI is in use. */ | |
9025 | if (fp_model == ARM_FLOAT_AUTO) | |
9026 | { | |
9027 | #ifdef HAVE_ELF | |
9028 | switch (bfd_elf_get_obj_attr_int (info.abfd, | |
9029 | OBJ_ATTR_PROC, | |
9030 | Tag_ABI_VFP_args)) | |
9031 | { | |
b35b0298 | 9032 | case AEABI_VFP_args_base: |
9779414d DJ |
9033 | /* "The user intended FP parameter/result |
9034 | passing to conform to AAPCS, base | |
9035 | variant". */ | |
9036 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9037 | break; | |
b35b0298 | 9038 | case AEABI_VFP_args_vfp: |
9779414d DJ |
9039 | /* "The user intended FP parameter/result |
9040 | passing to conform to AAPCS, VFP | |
9041 | variant". */ | |
9042 | fp_model = ARM_FLOAT_VFP; | |
9043 | break; | |
b35b0298 | 9044 | case AEABI_VFP_args_toolchain: |
9779414d DJ |
9045 | /* "The user intended FP parameter/result |
9046 | passing to conform to tool chain-specific | |
9047 | conventions" - we don't know any such | |
9048 | conventions, so leave it as "auto". */ | |
9049 | break; | |
b35b0298 | 9050 | case AEABI_VFP_args_compatible: |
5c294fee TG |
9051 | /* "Code is compatible with both the base |
9052 | and VFP variants; the user did not permit | |
9053 | non-variadic functions to pass FP | |
9054 | parameters/results" - leave it as | |
9055 | "auto". */ | |
9056 | break; | |
9779414d DJ |
9057 | default: |
9058 | /* Attribute value not mentioned in the | |
5c294fee | 9059 | November 2012 ABI, so leave it as |
9779414d DJ |
9060 | "auto". */ |
9061 | break; | |
9062 | } | |
9063 | #else | |
9064 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9065 | #endif | |
9066 | } | |
9067 | break; | |
9068 | ||
9069 | default: | |
9070 | /* Leave it as "auto". */ | |
9071 | warning (_("unknown ARM EABI version 0x%x"), eabi_ver); | |
9072 | break; | |
9073 | } | |
9074 | ||
9075 | #ifdef HAVE_ELF | |
9076 | /* Detect M-profile programs. This only works if the | |
9077 | executable file includes build attributes; GCC does | |
9078 | copy them to the executable, but e.g. RealView does | |
9079 | not. */ | |
17cbafdb SM |
9080 | int attr_arch |
9081 | = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, | |
9082 | Tag_CPU_arch); | |
9083 | int attr_profile | |
9084 | = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, | |
9085 | Tag_CPU_arch_profile); | |
9086 | ||
9779414d DJ |
9087 | /* GCC specifies the profile for v6-M; RealView only |
9088 | specifies the profile for architectures starting with | |
9089 | V7 (as opposed to architectures with a tag | |
9090 | numerically greater than TAG_CPU_ARCH_V7). */ | |
9091 | if (!tdesc_has_registers (tdesc) | |
9092 | && (attr_arch == TAG_CPU_ARCH_V6_M | |
9093 | || attr_arch == TAG_CPU_ARCH_V6S_M | |
9094 | || attr_profile == 'M')) | |
7559c217 | 9095 | is_m = true; |
9779414d DJ |
9096 | #endif |
9097 | } | |
9098 | ||
9099 | if (fp_model == ARM_FLOAT_AUTO) | |
9100 | { | |
9779414d DJ |
9101 | switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT)) |
9102 | { | |
9103 | case 0: | |
9104 | /* Leave it as "auto". Strictly speaking this case | |
9105 | means FPA, but almost nobody uses that now, and | |
9106 | many toolchains fail to set the appropriate bits | |
9107 | for the floating-point model they use. */ | |
9108 | break; | |
9109 | case EF_ARM_SOFT_FLOAT: | |
9110 | fp_model = ARM_FLOAT_SOFT_FPA; | |
9111 | break; | |
9112 | case EF_ARM_VFP_FLOAT: | |
9113 | fp_model = ARM_FLOAT_VFP; | |
9114 | break; | |
9115 | case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT: | |
9116 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9117 | break; | |
9118 | } | |
9119 | } | |
9120 | ||
9121 | if (e_flags & EF_ARM_BE8) | |
9122 | info.byte_order_for_code = BFD_ENDIAN_LITTLE; | |
9123 | ||
9124 | break; | |
9125 | ||
9126 | default: | |
9127 | /* Leave it as "auto". */ | |
9128 | break; | |
9129 | } | |
9130 | } | |
123dc839 DJ |
9131 | |
9132 | /* Check any target description for validity. */ | |
9779414d | 9133 | if (tdesc_has_registers (tdesc)) |
123dc839 DJ |
9134 | { |
9135 | /* For most registers we require GDB's default names; but also allow | |
9136 | the numeric names for sp / lr / pc, as a convenience. */ | |
9137 | static const char *const arm_sp_names[] = { "r13", "sp", NULL }; | |
9138 | static const char *const arm_lr_names[] = { "r14", "lr", NULL }; | |
9139 | static const char *const arm_pc_names[] = { "r15", "pc", NULL }; | |
9140 | ||
9141 | const struct tdesc_feature *feature; | |
58d6951d | 9142 | int valid_p; |
123dc839 | 9143 | |
9779414d | 9144 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
9145 | "org.gnu.gdb.arm.core"); |
9146 | if (feature == NULL) | |
9779414d DJ |
9147 | { |
9148 | feature = tdesc_find_feature (tdesc, | |
9149 | "org.gnu.gdb.arm.m-profile"); | |
9150 | if (feature == NULL) | |
9151 | return NULL; | |
9152 | else | |
7559c217 | 9153 | is_m = true; |
9779414d | 9154 | } |
123dc839 DJ |
9155 | |
9156 | tdesc_data = tdesc_data_alloc (); | |
9157 | ||
9158 | valid_p = 1; | |
9159 | for (i = 0; i < ARM_SP_REGNUM; i++) | |
c1e1314d | 9160 | valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), i, |
123dc839 | 9161 | arm_register_names[i]); |
c1e1314d | 9162 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data.get (), |
123dc839 DJ |
9163 | ARM_SP_REGNUM, |
9164 | arm_sp_names); | |
c1e1314d | 9165 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data.get (), |
123dc839 DJ |
9166 | ARM_LR_REGNUM, |
9167 | arm_lr_names); | |
c1e1314d | 9168 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data.get (), |
123dc839 DJ |
9169 | ARM_PC_REGNUM, |
9170 | arm_pc_names); | |
9779414d | 9171 | if (is_m) |
c1e1314d | 9172 | valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), |
9779414d DJ |
9173 | ARM_PS_REGNUM, "xpsr"); |
9174 | else | |
c1e1314d | 9175 | valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), |
9779414d | 9176 | ARM_PS_REGNUM, "cpsr"); |
123dc839 DJ |
9177 | |
9178 | if (!valid_p) | |
c1e1314d | 9179 | return NULL; |
123dc839 | 9180 | |
9779414d | 9181 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
9182 | "org.gnu.gdb.arm.fpa"); |
9183 | if (feature != NULL) | |
9184 | { | |
9185 | valid_p = 1; | |
9186 | for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++) | |
c1e1314d | 9187 | valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), i, |
123dc839 DJ |
9188 | arm_register_names[i]); |
9189 | if (!valid_p) | |
c1e1314d | 9190 | return NULL; |
123dc839 | 9191 | } |
ff6f572f | 9192 | else |
7559c217 | 9193 | have_fpa_registers = false; |
ff6f572f | 9194 | |
9779414d | 9195 | feature = tdesc_find_feature (tdesc, |
ff6f572f DJ |
9196 | "org.gnu.gdb.xscale.iwmmxt"); |
9197 | if (feature != NULL) | |
9198 | { | |
9199 | static const char *const iwmmxt_names[] = { | |
9200 | "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7", | |
9201 | "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15", | |
9202 | "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "", | |
9203 | "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "", | |
9204 | }; | |
9205 | ||
9206 | valid_p = 1; | |
9207 | for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++) | |
9208 | valid_p | |
c1e1314d | 9209 | &= tdesc_numbered_register (feature, tdesc_data.get (), i, |
ff6f572f DJ |
9210 | iwmmxt_names[i - ARM_WR0_REGNUM]); |
9211 | ||
9212 | /* Check for the control registers, but do not fail if they | |
9213 | are missing. */ | |
9214 | for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++) | |
c1e1314d | 9215 | tdesc_numbered_register (feature, tdesc_data.get (), i, |
ff6f572f DJ |
9216 | iwmmxt_names[i - ARM_WR0_REGNUM]); |
9217 | ||
9218 | for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++) | |
9219 | valid_p | |
c1e1314d | 9220 | &= tdesc_numbered_register (feature, tdesc_data.get (), i, |
ff6f572f DJ |
9221 | iwmmxt_names[i - ARM_WR0_REGNUM]); |
9222 | ||
9223 | if (!valid_p) | |
c1e1314d | 9224 | return NULL; |
a56cc1ce | 9225 | |
7559c217 | 9226 | have_wmmx_registers = true; |
ff6f572f | 9227 | } |
58d6951d DJ |
9228 | |
9229 | /* If we have a VFP unit, check whether the single precision registers | |
9230 | are present. If not, then we will synthesize them as pseudo | |
9231 | registers. */ | |
9779414d | 9232 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
9233 | "org.gnu.gdb.arm.vfp"); |
9234 | if (feature != NULL) | |
9235 | { | |
9236 | static const char *const vfp_double_names[] = { | |
9237 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
9238 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", | |
9239 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", | |
9240 | "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", | |
9241 | }; | |
9242 | ||
9243 | /* Require the double precision registers. There must be either | |
9244 | 16 or 32. */ | |
9245 | valid_p = 1; | |
9246 | for (i = 0; i < 32; i++) | |
9247 | { | |
c1e1314d | 9248 | valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), |
58d6951d DJ |
9249 | ARM_D0_REGNUM + i, |
9250 | vfp_double_names[i]); | |
9251 | if (!valid_p) | |
9252 | break; | |
9253 | } | |
2b9e5ea6 UW |
9254 | if (!valid_p && i == 16) |
9255 | valid_p = 1; | |
58d6951d | 9256 | |
2b9e5ea6 | 9257 | /* Also require FPSCR. */ |
c1e1314d | 9258 | valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), |
2b9e5ea6 UW |
9259 | ARM_FPSCR_REGNUM, "fpscr"); |
9260 | if (!valid_p) | |
c1e1314d | 9261 | return NULL; |
58d6951d DJ |
9262 | |
9263 | if (tdesc_unnumbered_register (feature, "s0") == 0) | |
7559c217 | 9264 | have_vfp_pseudos = true; |
58d6951d | 9265 | |
330c6ca9 | 9266 | vfp_register_count = i; |
58d6951d DJ |
9267 | |
9268 | /* If we have VFP, also check for NEON. The architecture allows | |
9269 | NEON without VFP (integer vector operations only), but GDB | |
9270 | does not support that. */ | |
9779414d | 9271 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
9272 | "org.gnu.gdb.arm.neon"); |
9273 | if (feature != NULL) | |
9274 | { | |
9275 | /* NEON requires 32 double-precision registers. */ | |
9276 | if (i != 32) | |
c1e1314d | 9277 | return NULL; |
58d6951d DJ |
9278 | |
9279 | /* If there are quad registers defined by the stub, use | |
9280 | their type; otherwise (normally) provide them with | |
9281 | the default type. */ | |
9282 | if (tdesc_unnumbered_register (feature, "q0") == 0) | |
7559c217 | 9283 | have_neon_pseudos = true; |
58d6951d | 9284 | |
7559c217 | 9285 | have_neon = true; |
58d6951d DJ |
9286 | } |
9287 | } | |
123dc839 | 9288 | } |
39bbf761 | 9289 | |
28e97307 DJ |
9290 | /* If there is already a candidate, use it. */ |
9291 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
9292 | best_arch != NULL; | |
9293 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
9294 | { | |
b8926edc DJ |
9295 | if (arm_abi != ARM_ABI_AUTO |
9296 | && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi) | |
28e97307 DJ |
9297 | continue; |
9298 | ||
b8926edc DJ |
9299 | if (fp_model != ARM_FLOAT_AUTO |
9300 | && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model) | |
28e97307 DJ |
9301 | continue; |
9302 | ||
58d6951d DJ |
9303 | /* There are various other properties in tdep that we do not |
9304 | need to check here: those derived from a target description, | |
9305 | since gdbarches with a different target description are | |
9306 | automatically disqualified. */ | |
9307 | ||
9779414d DJ |
9308 | /* Do check is_m, though, since it might come from the binary. */ |
9309 | if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m) | |
9310 | continue; | |
9311 | ||
28e97307 DJ |
9312 | /* Found a match. */ |
9313 | break; | |
9314 | } | |
97e03143 | 9315 | |
28e97307 | 9316 | if (best_arch != NULL) |
c1e1314d | 9317 | return best_arch->gdbarch; |
28e97307 | 9318 | |
8d749320 | 9319 | tdep = XCNEW (struct gdbarch_tdep); |
97e03143 RE |
9320 | gdbarch = gdbarch_alloc (&info, tdep); |
9321 | ||
28e97307 DJ |
9322 | /* Record additional information about the architecture we are defining. |
9323 | These are gdbarch discriminators, like the OSABI. */ | |
9324 | tdep->arm_abi = arm_abi; | |
9325 | tdep->fp_model = fp_model; | |
9779414d | 9326 | tdep->is_m = is_m; |
ff6f572f | 9327 | tdep->have_fpa_registers = have_fpa_registers; |
a56cc1ce | 9328 | tdep->have_wmmx_registers = have_wmmx_registers; |
330c6ca9 YQ |
9329 | gdb_assert (vfp_register_count == 0 |
9330 | || vfp_register_count == 16 | |
9331 | || vfp_register_count == 32); | |
9332 | tdep->vfp_register_count = vfp_register_count; | |
58d6951d DJ |
9333 | tdep->have_vfp_pseudos = have_vfp_pseudos; |
9334 | tdep->have_neon_pseudos = have_neon_pseudos; | |
9335 | tdep->have_neon = have_neon; | |
08216dd7 | 9336 | |
25f8c692 JL |
9337 | arm_register_g_packet_guesses (gdbarch); |
9338 | ||
08216dd7 | 9339 | /* Breakpoints. */ |
9d4fde75 | 9340 | switch (info.byte_order_for_code) |
67255d04 RE |
9341 | { |
9342 | case BFD_ENDIAN_BIG: | |
66e810cd RE |
9343 | tdep->arm_breakpoint = arm_default_arm_be_breakpoint; |
9344 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint); | |
9345 | tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint; | |
9346 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint); | |
9347 | ||
67255d04 RE |
9348 | break; |
9349 | ||
9350 | case BFD_ENDIAN_LITTLE: | |
66e810cd RE |
9351 | tdep->arm_breakpoint = arm_default_arm_le_breakpoint; |
9352 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint); | |
9353 | tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint; | |
9354 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint); | |
9355 | ||
67255d04 RE |
9356 | break; |
9357 | ||
9358 | default: | |
9359 | internal_error (__FILE__, __LINE__, | |
edefbb7c | 9360 | _("arm_gdbarch_init: bad byte order for float format")); |
67255d04 RE |
9361 | } |
9362 | ||
d7b486e7 RE |
9363 | /* On ARM targets char defaults to unsigned. */ |
9364 | set_gdbarch_char_signed (gdbarch, 0); | |
9365 | ||
53375380 PA |
9366 | /* wchar_t is unsigned under the AAPCS. */ |
9367 | if (tdep->arm_abi == ARM_ABI_AAPCS) | |
9368 | set_gdbarch_wchar_signed (gdbarch, 0); | |
9369 | else | |
9370 | set_gdbarch_wchar_signed (gdbarch, 1); | |
53375380 | 9371 | |
030197b4 AB |
9372 | /* Compute type alignment. */ |
9373 | set_gdbarch_type_align (gdbarch, arm_type_align); | |
9374 | ||
cca44b1b JB |
9375 | /* Note: for displaced stepping, this includes the breakpoint, and one word |
9376 | of additional scratch space. This setting isn't used for anything beside | |
9377 | displaced stepping at present. */ | |
e935475c | 9378 | set_gdbarch_max_insn_length (gdbarch, 4 * ARM_DISPLACED_MODIFIED_INSNS); |
cca44b1b | 9379 | |
9df628e0 | 9380 | /* This should be low enough for everything. */ |
97e03143 | 9381 | tdep->lowest_pc = 0x20; |
94c30b78 | 9382 | tdep->jb_pc = -1; /* Longjump support not enabled by default. */ |
97e03143 | 9383 | |
7c00367c MK |
9384 | /* The default, for both APCS and AAPCS, is to return small |
9385 | structures in registers. */ | |
9386 | tdep->struct_return = reg_struct_return; | |
9387 | ||
2dd604e7 | 9388 | set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call); |
f53f0d0b | 9389 | set_gdbarch_frame_align (gdbarch, arm_frame_align); |
39bbf761 | 9390 | |
7eb89530 YQ |
9391 | if (is_m) |
9392 | set_gdbarch_code_of_frame_writable (gdbarch, arm_code_of_frame_writable); | |
9393 | ||
756fe439 DJ |
9394 | set_gdbarch_write_pc (gdbarch, arm_write_pc); |
9395 | ||
eb5492fa | 9396 | frame_base_set_default (gdbarch, &arm_normal_base); |
148754e5 | 9397 | |
34e8f22d | 9398 | /* Address manipulation. */ |
34e8f22d RE |
9399 | set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove); |
9400 | ||
34e8f22d RE |
9401 | /* Advance PC across function entry code. */ |
9402 | set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue); | |
9403 | ||
c9cf6e20 MG |
9404 | /* Detect whether PC is at a point where the stack has been destroyed. */ |
9405 | set_gdbarch_stack_frame_destroyed_p (gdbarch, arm_stack_frame_destroyed_p); | |
4024ca99 | 9406 | |
190dce09 UW |
9407 | /* Skip trampolines. */ |
9408 | set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub); | |
9409 | ||
34e8f22d RE |
9410 | /* The stack grows downward. */ |
9411 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
9412 | ||
9413 | /* Breakpoint manipulation. */ | |
04180708 YQ |
9414 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, arm_breakpoint_kind_from_pc); |
9415 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, arm_sw_breakpoint_from_kind); | |
833b7ab5 YQ |
9416 | set_gdbarch_breakpoint_kind_from_current_state (gdbarch, |
9417 | arm_breakpoint_kind_from_current_state); | |
34e8f22d RE |
9418 | |
9419 | /* Information about registers, etc. */ | |
34e8f22d RE |
9420 | set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM); |
9421 | set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM); | |
ff6f572f | 9422 | set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS); |
7a5ea0d4 | 9423 | set_gdbarch_register_type (gdbarch, arm_register_type); |
54483882 | 9424 | set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p); |
34e8f22d | 9425 | |
ff6f572f DJ |
9426 | /* This "info float" is FPA-specific. Use the generic version if we |
9427 | do not have FPA. */ | |
9428 | if (gdbarch_tdep (gdbarch)->have_fpa_registers) | |
9429 | set_gdbarch_print_float_info (gdbarch, arm_print_float_info); | |
9430 | ||
26216b98 | 9431 | /* Internal <-> external register number maps. */ |
ff6f572f | 9432 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum); |
26216b98 AC |
9433 | set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno); |
9434 | ||
34e8f22d RE |
9435 | set_gdbarch_register_name (gdbarch, arm_register_name); |
9436 | ||
9437 | /* Returning results. */ | |
2af48f68 | 9438 | set_gdbarch_return_value (gdbarch, arm_return_value); |
34e8f22d | 9439 | |
03d48a7d RE |
9440 | /* Disassembly. */ |
9441 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm); | |
9442 | ||
34e8f22d RE |
9443 | /* Minsymbol frobbing. */ |
9444 | set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special); | |
9445 | set_gdbarch_coff_make_msymbol_special (gdbarch, | |
9446 | arm_coff_make_msymbol_special); | |
60c5725c | 9447 | set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol); |
34e8f22d | 9448 | |
f9d67f43 DJ |
9449 | /* Thumb-2 IT block support. */ |
9450 | set_gdbarch_adjust_breakpoint_address (gdbarch, | |
9451 | arm_adjust_breakpoint_address); | |
9452 | ||
0d5de010 DJ |
9453 | /* Virtual tables. */ |
9454 | set_gdbarch_vbit_in_delta (gdbarch, 1); | |
9455 | ||
97e03143 | 9456 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
4be87837 | 9457 | gdbarch_init_osabi (info, gdbarch); |
97e03143 | 9458 | |
b39cc962 DJ |
9459 | dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg); |
9460 | ||
eb5492fa | 9461 | /* Add some default predicates. */ |
2ae28aa9 YQ |
9462 | if (is_m) |
9463 | frame_unwind_append_unwinder (gdbarch, &arm_m_exception_unwind); | |
a262aec2 DJ |
9464 | frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind); |
9465 | dwarf2_append_unwinders (gdbarch); | |
0e9e9abd | 9466 | frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind); |
779aa56f | 9467 | frame_unwind_append_unwinder (gdbarch, &arm_epilogue_frame_unwind); |
a262aec2 | 9468 | frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind); |
eb5492fa | 9469 | |
97e03143 RE |
9470 | /* Now we have tuned the configuration, set a few final things, |
9471 | based on what the OS ABI has told us. */ | |
9472 | ||
b8926edc DJ |
9473 | /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI |
9474 | binaries are always marked. */ | |
9475 | if (tdep->arm_abi == ARM_ABI_AUTO) | |
9476 | tdep->arm_abi = ARM_ABI_APCS; | |
9477 | ||
e3039479 UW |
9478 | /* Watchpoints are not steppable. */ |
9479 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); | |
9480 | ||
b8926edc DJ |
9481 | /* We used to default to FPA for generic ARM, but almost nobody |
9482 | uses that now, and we now provide a way for the user to force | |
9483 | the model. So default to the most useful variant. */ | |
9484 | if (tdep->fp_model == ARM_FLOAT_AUTO) | |
9485 | tdep->fp_model = ARM_FLOAT_SOFT_FPA; | |
9486 | ||
9df628e0 RE |
9487 | if (tdep->jb_pc >= 0) |
9488 | set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target); | |
9489 | ||
08216dd7 | 9490 | /* Floating point sizes and format. */ |
8da61cc4 | 9491 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
b8926edc | 9492 | if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA) |
08216dd7 | 9493 | { |
8da61cc4 DJ |
9494 | set_gdbarch_double_format |
9495 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
9496 | set_gdbarch_long_double_format | |
9497 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
9498 | } | |
9499 | else | |
9500 | { | |
9501 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
9502 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
08216dd7 RE |
9503 | } |
9504 | ||
58d6951d DJ |
9505 | if (have_vfp_pseudos) |
9506 | { | |
9507 | /* NOTE: These are the only pseudo registers used by | |
9508 | the ARM target at the moment. If more are added, a | |
9509 | little more care in numbering will be needed. */ | |
9510 | ||
9511 | int num_pseudos = 32; | |
9512 | if (have_neon_pseudos) | |
9513 | num_pseudos += 16; | |
9514 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos); | |
9515 | set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read); | |
9516 | set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write); | |
9517 | } | |
9518 | ||
c1e1314d | 9519 | if (tdesc_data != nullptr) |
58d6951d DJ |
9520 | { |
9521 | set_tdesc_pseudo_register_name (gdbarch, arm_register_name); | |
9522 | ||
c1e1314d | 9523 | tdesc_use_registers (gdbarch, tdesc, std::move (tdesc_data)); |
58d6951d DJ |
9524 | |
9525 | /* Override tdesc_register_type to adjust the types of VFP | |
9526 | registers for NEON. */ | |
9527 | set_gdbarch_register_type (gdbarch, arm_register_type); | |
9528 | } | |
123dc839 DJ |
9529 | |
9530 | /* Add standard register aliases. We add aliases even for those | |
85102364 | 9531 | names which are used by the current architecture - it's simpler, |
123dc839 DJ |
9532 | and does no harm, since nothing ever lists user registers. */ |
9533 | for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++) | |
9534 | user_reg_add (gdbarch, arm_register_aliases[i].name, | |
9535 | value_of_arm_user_reg, &arm_register_aliases[i].regnum); | |
9536 | ||
65b48a81 PB |
9537 | set_gdbarch_disassembler_options (gdbarch, &arm_disassembler_options); |
9538 | set_gdbarch_valid_disassembler_options (gdbarch, disassembler_options_arm ()); | |
9539 | ||
3426ae57 AH |
9540 | set_gdbarch_gnu_triplet_regexp (gdbarch, arm_gnu_triplet_regexp); |
9541 | ||
39bbf761 RE |
9542 | return gdbarch; |
9543 | } | |
9544 | ||
97e03143 | 9545 | static void |
2af46ca0 | 9546 | arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
97e03143 | 9547 | { |
2af46ca0 | 9548 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
97e03143 RE |
9549 | |
9550 | if (tdep == NULL) | |
9551 | return; | |
9552 | ||
aeefc73c CB |
9553 | fprintf_unfiltered (file, _("arm_dump_tdep: fp_model = %i\n"), |
9554 | (int) tdep->fp_model); | |
9555 | fprintf_unfiltered (file, _("arm_dump_tdep: have_fpa_registers = %i\n"), | |
9556 | (int) tdep->have_fpa_registers); | |
9557 | fprintf_unfiltered (file, _("arm_dump_tdep: have_wmmx_registers = %i\n"), | |
9558 | (int) tdep->have_wmmx_registers); | |
9559 | fprintf_unfiltered (file, _("arm_dump_tdep: vfp_register_count = %i\n"), | |
9560 | (int) tdep->vfp_register_count); | |
9561 | fprintf_unfiltered (file, _("arm_dump_tdep: have_vfp_pseudos = %i\n"), | |
9562 | (int) tdep->have_vfp_pseudos); | |
9563 | fprintf_unfiltered (file, _("arm_dump_tdep: have_neon_pseudos = %i\n"), | |
9564 | (int) tdep->have_neon_pseudos); | |
9565 | fprintf_unfiltered (file, _("arm_dump_tdep: have_neon = %i\n"), | |
9566 | (int) tdep->have_neon); | |
754e1564 | 9567 | fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx\n"), |
97e03143 RE |
9568 | (unsigned long) tdep->lowest_pc); |
9569 | } | |
9570 | ||
0d4c07af | 9571 | #if GDB_SELF_TEST |
b121eeb9 YQ |
9572 | namespace selftests |
9573 | { | |
9574 | static void arm_record_test (void); | |
9575 | } | |
0d4c07af | 9576 | #endif |
b121eeb9 | 9577 | |
6c265988 | 9578 | void _initialize_arm_tdep (); |
c906108c | 9579 | void |
6c265988 | 9580 | _initialize_arm_tdep () |
c906108c | 9581 | { |
bc90b915 | 9582 | long length; |
65b48a81 | 9583 | int i, j; |
edefbb7c AC |
9584 | char regdesc[1024], *rdptr = regdesc; |
9585 | size_t rest = sizeof (regdesc); | |
085dd6e6 | 9586 | |
42cf1509 | 9587 | gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep); |
97e03143 | 9588 | |
0e9e9abd | 9589 | /* Add ourselves to objfile event chain. */ |
76727919 | 9590 | gdb::observers::new_objfile.attach (arm_exidx_new_objfile); |
0e9e9abd | 9591 | |
70f80edf JT |
9592 | /* Register an ELF OS ABI sniffer for ARM binaries. */ |
9593 | gdbarch_register_osabi_sniffer (bfd_arch_arm, | |
9594 | bfd_target_elf_flavour, | |
9595 | arm_elf_osabi_sniffer); | |
9596 | ||
afd7eef0 | 9597 | /* Add root prefix command for all "set arm"/"show arm" commands. */ |
0743fc83 TT |
9598 | add_basic_prefix_cmd ("arm", no_class, |
9599 | _("Various ARM-specific commands."), | |
9600 | &setarmcmdlist, "set arm ", 0, &setlist); | |
afd7eef0 | 9601 | |
0743fc83 TT |
9602 | add_show_prefix_cmd ("arm", no_class, |
9603 | _("Various ARM-specific commands."), | |
9604 | &showarmcmdlist, "show arm ", 0, &showlist); | |
bc90b915 | 9605 | |
c5aa993b | 9606 | |
65b48a81 | 9607 | arm_disassembler_options = xstrdup ("reg-names-std"); |
471b9d15 MR |
9608 | const disasm_options_t *disasm_options |
9609 | = &disassembler_options_arm ()->options; | |
65b48a81 PB |
9610 | int num_disassembly_styles = 0; |
9611 | for (i = 0; disasm_options->name[i] != NULL; i++) | |
9612 | if (CONST_STRNEQ (disasm_options->name[i], "reg-names-")) | |
9613 | num_disassembly_styles++; | |
9614 | ||
9615 | /* Initialize the array that will be passed to add_setshow_enum_cmd(). */ | |
8d749320 | 9616 | valid_disassembly_styles = XNEWVEC (const char *, |
65b48a81 PB |
9617 | num_disassembly_styles + 1); |
9618 | for (i = j = 0; disasm_options->name[i] != NULL; i++) | |
9619 | if (CONST_STRNEQ (disasm_options->name[i], "reg-names-")) | |
9620 | { | |
9621 | size_t offset = strlen ("reg-names-"); | |
9622 | const char *style = disasm_options->name[i]; | |
9623 | valid_disassembly_styles[j++] = &style[offset]; | |
9624 | length = snprintf (rdptr, rest, "%s - %s\n", &style[offset], | |
9625 | disasm_options->description[i]); | |
9626 | rdptr += length; | |
9627 | rest -= length; | |
9628 | } | |
94c30b78 | 9629 | /* Mark the end of valid options. */ |
65b48a81 | 9630 | valid_disassembly_styles[num_disassembly_styles] = NULL; |
c906108c | 9631 | |
edefbb7c | 9632 | /* Create the help text. */ |
d7e74731 PA |
9633 | std::string helptext = string_printf ("%s%s%s", |
9634 | _("The valid values are:\n"), | |
9635 | regdesc, | |
9636 | _("The default is \"std\".")); | |
ed9a39eb | 9637 | |
edefbb7c AC |
9638 | add_setshow_enum_cmd("disassembler", no_class, |
9639 | valid_disassembly_styles, &disassembly_style, | |
9640 | _("Set the disassembly style."), | |
9641 | _("Show the disassembly style."), | |
09b0e4b0 | 9642 | helptext.c_str (), |
2c5b56ce | 9643 | set_disassembly_style_sfunc, |
65b48a81 | 9644 | show_disassembly_style_sfunc, |
7376b4c2 | 9645 | &setarmcmdlist, &showarmcmdlist); |
edefbb7c AC |
9646 | |
9647 | add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32, | |
9648 | _("Set usage of ARM 32-bit mode."), | |
9649 | _("Show usage of ARM 32-bit mode."), | |
9650 | _("When off, a 26-bit PC will be used."), | |
2c5b56ce | 9651 | NULL, |
0963b4bd MS |
9652 | NULL, /* FIXME: i18n: Usage of ARM 32-bit |
9653 | mode is %s. */ | |
26304000 | 9654 | &setarmcmdlist, &showarmcmdlist); |
c906108c | 9655 | |
fd50bc42 | 9656 | /* Add a command to allow the user to force the FPU model. */ |
edefbb7c AC |
9657 | add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model, |
9658 | _("Set the floating point type."), | |
9659 | _("Show the floating point type."), | |
9660 | _("auto - Determine the FP typefrom the OS-ABI.\n\ | |
9661 | softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\ | |
9662 | fpa - FPA co-processor (GCC compiled).\n\ | |
9663 | softvfp - Software FP with pure-endian doubles.\n\ | |
9664 | vfp - VFP co-processor."), | |
edefbb7c | 9665 | set_fp_model_sfunc, show_fp_model, |
7376b4c2 | 9666 | &setarmcmdlist, &showarmcmdlist); |
fd50bc42 | 9667 | |
28e97307 DJ |
9668 | /* Add a command to allow the user to force the ABI. */ |
9669 | add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string, | |
9670 | _("Set the ABI."), | |
9671 | _("Show the ABI."), | |
9672 | NULL, arm_set_abi, arm_show_abi, | |
9673 | &setarmcmdlist, &showarmcmdlist); | |
9674 | ||
0428b8f5 DJ |
9675 | /* Add two commands to allow the user to force the assumed |
9676 | execution mode. */ | |
9677 | add_setshow_enum_cmd ("fallback-mode", class_support, | |
9678 | arm_mode_strings, &arm_fallback_mode_string, | |
9679 | _("Set the mode assumed when symbols are unavailable."), | |
9680 | _("Show the mode assumed when symbols are unavailable."), | |
9681 | NULL, NULL, arm_show_fallback_mode, | |
9682 | &setarmcmdlist, &showarmcmdlist); | |
9683 | add_setshow_enum_cmd ("force-mode", class_support, | |
9684 | arm_mode_strings, &arm_force_mode_string, | |
9685 | _("Set the mode assumed even when symbols are available."), | |
9686 | _("Show the mode assumed even when symbols are available."), | |
9687 | NULL, NULL, arm_show_force_mode, | |
9688 | &setarmcmdlist, &showarmcmdlist); | |
9689 | ||
6529d2dd | 9690 | /* Debugging flag. */ |
edefbb7c AC |
9691 | add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug, |
9692 | _("Set ARM debugging."), | |
9693 | _("Show ARM debugging."), | |
9694 | _("When on, arm-specific debugging is enabled."), | |
2c5b56ce | 9695 | NULL, |
7915a72c | 9696 | NULL, /* FIXME: i18n: "ARM debugging is %s. */ |
26304000 | 9697 | &setdebuglist, &showdebuglist); |
b121eeb9 YQ |
9698 | |
9699 | #if GDB_SELF_TEST | |
1526853e | 9700 | selftests::register_test ("arm-record", selftests::arm_record_test); |
b121eeb9 YQ |
9701 | #endif |
9702 | ||
c906108c | 9703 | } |
72508ac0 PO |
9704 | |
9705 | /* ARM-reversible process record data structures. */ | |
9706 | ||
9707 | #define ARM_INSN_SIZE_BYTES 4 | |
9708 | #define THUMB_INSN_SIZE_BYTES 2 | |
9709 | #define THUMB2_INSN_SIZE_BYTES 4 | |
9710 | ||
9711 | ||
71e396f9 LM |
9712 | /* Position of the bit within a 32-bit ARM instruction |
9713 | that defines whether the instruction is a load or store. */ | |
72508ac0 PO |
9714 | #define INSN_S_L_BIT_NUM 20 |
9715 | ||
9716 | #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \ | |
9717 | do \ | |
9718 | { \ | |
9719 | unsigned int reg_len = LENGTH; \ | |
9720 | if (reg_len) \ | |
9721 | { \ | |
9722 | REGS = XNEWVEC (uint32_t, reg_len); \ | |
9723 | memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \ | |
9724 | } \ | |
9725 | } \ | |
9726 | while (0) | |
9727 | ||
9728 | #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \ | |
9729 | do \ | |
9730 | { \ | |
9731 | unsigned int mem_len = LENGTH; \ | |
9732 | if (mem_len) \ | |
9733 | { \ | |
9734 | MEMS = XNEWVEC (struct arm_mem_r, mem_len); \ | |
9735 | memcpy(&MEMS->len, &RECORD_BUF[0], \ | |
9736 | sizeof(struct arm_mem_r) * LENGTH); \ | |
9737 | } \ | |
9738 | } \ | |
9739 | while (0) | |
9740 | ||
9741 | /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */ | |
9742 | #define INSN_RECORDED(ARM_RECORD) \ | |
9743 | (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count) | |
9744 | ||
9745 | /* ARM memory record structure. */ | |
9746 | struct arm_mem_r | |
9747 | { | |
9748 | uint32_t len; /* Record length. */ | |
bfbbec00 | 9749 | uint32_t addr; /* Memory address. */ |
72508ac0 PO |
9750 | }; |
9751 | ||
9752 | /* ARM instruction record contains opcode of current insn | |
9753 | and execution state (before entry to decode_insn()), | |
9754 | contains list of to-be-modified registers and | |
9755 | memory blocks (on return from decode_insn()). */ | |
9756 | ||
9757 | typedef struct insn_decode_record_t | |
9758 | { | |
9759 | struct gdbarch *gdbarch; | |
9760 | struct regcache *regcache; | |
9761 | CORE_ADDR this_addr; /* Address of the insn being decoded. */ | |
9762 | uint32_t arm_insn; /* Should accommodate thumb. */ | |
9763 | uint32_t cond; /* Condition code. */ | |
9764 | uint32_t opcode; /* Insn opcode. */ | |
9765 | uint32_t decode; /* Insn decode bits. */ | |
9766 | uint32_t mem_rec_count; /* No of mem records. */ | |
9767 | uint32_t reg_rec_count; /* No of reg records. */ | |
9768 | uint32_t *arm_regs; /* Registers to be saved for this record. */ | |
9769 | struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */ | |
9770 | } insn_decode_record; | |
9771 | ||
9772 | ||
9773 | /* Checks ARM SBZ and SBO mandatory fields. */ | |
9774 | ||
9775 | static int | |
9776 | sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo) | |
9777 | { | |
9778 | uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1)); | |
9779 | ||
9780 | if (!len) | |
9781 | return 1; | |
9782 | ||
9783 | if (!sbo) | |
9784 | ones = ~ones; | |
9785 | ||
9786 | while (ones) | |
9787 | { | |
9788 | if (!(ones & sbo)) | |
9789 | { | |
9790 | return 0; | |
9791 | } | |
9792 | ones = ones >> 1; | |
9793 | } | |
9794 | return 1; | |
9795 | } | |
9796 | ||
c6ec2b30 OJ |
9797 | enum arm_record_result |
9798 | { | |
9799 | ARM_RECORD_SUCCESS = 0, | |
9800 | ARM_RECORD_FAILURE = 1 | |
9801 | }; | |
9802 | ||
72508ac0 PO |
9803 | typedef enum |
9804 | { | |
9805 | ARM_RECORD_STRH=1, | |
9806 | ARM_RECORD_STRD | |
9807 | } arm_record_strx_t; | |
9808 | ||
9809 | typedef enum | |
9810 | { | |
9811 | ARM_RECORD=1, | |
9812 | THUMB_RECORD, | |
9813 | THUMB2_RECORD | |
9814 | } record_type_t; | |
9815 | ||
9816 | ||
9817 | static int | |
9818 | arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf, | |
9819 | uint32_t *record_buf_mem, arm_record_strx_t str_type) | |
9820 | { | |
9821 | ||
9822 | struct regcache *reg_cache = arm_insn_r->regcache; | |
9823 | ULONGEST u_regval[2]= {0}; | |
9824 | ||
9825 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
9826 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
72508ac0 PO |
9827 | |
9828 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
9829 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
72508ac0 PO |
9830 | |
9831 | if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
9832 | { | |
9833 | /* 1) Handle misc store, immediate offset. */ | |
9834 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
9835 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
9836 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
9837 | regcache_raw_read_unsigned (reg_cache, reg_src1, | |
9838 | &u_regval[0]); | |
9839 | if (ARM_PC_REGNUM == reg_src1) | |
9840 | { | |
9841 | /* If R15 was used as Rn, hence current PC+8. */ | |
9842 | u_regval[0] = u_regval[0] + 8; | |
9843 | } | |
9844 | offset_8 = (immed_high << 4) | immed_low; | |
9845 | /* Calculate target store address. */ | |
9846 | if (14 == arm_insn_r->opcode) | |
9847 | { | |
9848 | tgt_mem_addr = u_regval[0] + offset_8; | |
9849 | } | |
9850 | else | |
9851 | { | |
9852 | tgt_mem_addr = u_regval[0] - offset_8; | |
9853 | } | |
9854 | if (ARM_RECORD_STRH == str_type) | |
9855 | { | |
9856 | record_buf_mem[0] = 2; | |
9857 | record_buf_mem[1] = tgt_mem_addr; | |
9858 | arm_insn_r->mem_rec_count = 1; | |
9859 | } | |
9860 | else if (ARM_RECORD_STRD == str_type) | |
9861 | { | |
9862 | record_buf_mem[0] = 4; | |
9863 | record_buf_mem[1] = tgt_mem_addr; | |
9864 | record_buf_mem[2] = 4; | |
9865 | record_buf_mem[3] = tgt_mem_addr + 4; | |
9866 | arm_insn_r->mem_rec_count = 2; | |
9867 | } | |
9868 | } | |
9869 | else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode) | |
9870 | { | |
9871 | /* 2) Store, register offset. */ | |
9872 | /* Get Rm. */ | |
9873 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
9874 | /* Get Rn. */ | |
9875 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
9876 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
9877 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
9878 | if (15 == reg_src2) | |
9879 | { | |
9880 | /* If R15 was used as Rn, hence current PC+8. */ | |
9881 | u_regval[0] = u_regval[0] + 8; | |
9882 | } | |
9883 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
9884 | if (12 == arm_insn_r->opcode) | |
9885 | { | |
9886 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
9887 | } | |
9888 | else | |
9889 | { | |
9890 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
9891 | } | |
9892 | if (ARM_RECORD_STRH == str_type) | |
9893 | { | |
9894 | record_buf_mem[0] = 2; | |
9895 | record_buf_mem[1] = tgt_mem_addr; | |
9896 | arm_insn_r->mem_rec_count = 1; | |
9897 | } | |
9898 | else if (ARM_RECORD_STRD == str_type) | |
9899 | { | |
9900 | record_buf_mem[0] = 4; | |
9901 | record_buf_mem[1] = tgt_mem_addr; | |
9902 | record_buf_mem[2] = 4; | |
9903 | record_buf_mem[3] = tgt_mem_addr + 4; | |
9904 | arm_insn_r->mem_rec_count = 2; | |
9905 | } | |
9906 | } | |
9907 | else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
9908 | || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
9909 | { | |
9910 | /* 3) Store, immediate pre-indexed. */ | |
9911 | /* 5) Store, immediate post-indexed. */ | |
9912 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
9913 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
9914 | offset_8 = (immed_high << 4) | immed_low; | |
9915 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
9916 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
9917 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
9918 | if (15 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
9919 | { | |
9920 | tgt_mem_addr = u_regval[0] + offset_8; | |
9921 | } | |
9922 | else | |
9923 | { | |
9924 | tgt_mem_addr = u_regval[0] - offset_8; | |
9925 | } | |
9926 | if (ARM_RECORD_STRH == str_type) | |
9927 | { | |
9928 | record_buf_mem[0] = 2; | |
9929 | record_buf_mem[1] = tgt_mem_addr; | |
9930 | arm_insn_r->mem_rec_count = 1; | |
9931 | } | |
9932 | else if (ARM_RECORD_STRD == str_type) | |
9933 | { | |
9934 | record_buf_mem[0] = 4; | |
9935 | record_buf_mem[1] = tgt_mem_addr; | |
9936 | record_buf_mem[2] = 4; | |
9937 | record_buf_mem[3] = tgt_mem_addr + 4; | |
9938 | arm_insn_r->mem_rec_count = 2; | |
9939 | } | |
9940 | /* Record Rn also as it changes. */ | |
9941 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
9942 | arm_insn_r->reg_rec_count = 1; | |
9943 | } | |
9944 | else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode | |
9945 | || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
9946 | { | |
9947 | /* 4) Store, register pre-indexed. */ | |
9948 | /* 6) Store, register post -indexed. */ | |
9949 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
9950 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
9951 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
9952 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
9953 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
9954 | if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
9955 | { | |
9956 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
9957 | } | |
9958 | else | |
9959 | { | |
9960 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
9961 | } | |
9962 | if (ARM_RECORD_STRH == str_type) | |
9963 | { | |
9964 | record_buf_mem[0] = 2; | |
9965 | record_buf_mem[1] = tgt_mem_addr; | |
9966 | arm_insn_r->mem_rec_count = 1; | |
9967 | } | |
9968 | else if (ARM_RECORD_STRD == str_type) | |
9969 | { | |
9970 | record_buf_mem[0] = 4; | |
9971 | record_buf_mem[1] = tgt_mem_addr; | |
9972 | record_buf_mem[2] = 4; | |
9973 | record_buf_mem[3] = tgt_mem_addr + 4; | |
9974 | arm_insn_r->mem_rec_count = 2; | |
9975 | } | |
9976 | /* Record Rn also as it changes. */ | |
9977 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
9978 | arm_insn_r->reg_rec_count = 1; | |
9979 | } | |
9980 | return 0; | |
9981 | } | |
9982 | ||
9983 | /* Handling ARM extension space insns. */ | |
9984 | ||
9985 | static int | |
9986 | arm_record_extension_space (insn_decode_record *arm_insn_r) | |
9987 | { | |
df95a9cf | 9988 | int ret = 0; /* Return value: -1:record failure ; 0:success */ |
72508ac0 PO |
9989 | uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0; |
9990 | uint32_t record_buf[8], record_buf_mem[8]; | |
9991 | uint32_t reg_src1 = 0; | |
72508ac0 PO |
9992 | struct regcache *reg_cache = arm_insn_r->regcache; |
9993 | ULONGEST u_regval = 0; | |
9994 | ||
9995 | gdb_assert (!INSN_RECORDED(arm_insn_r)); | |
9996 | /* Handle unconditional insn extension space. */ | |
9997 | ||
9998 | opcode1 = bits (arm_insn_r->arm_insn, 20, 27); | |
9999 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10000 | if (arm_insn_r->cond) | |
10001 | { | |
10002 | /* PLD has no affect on architectural state, it just affects | |
10003 | the caches. */ | |
10004 | if (5 == ((opcode1 & 0xE0) >> 5)) | |
10005 | { | |
10006 | /* BLX(1) */ | |
10007 | record_buf[0] = ARM_PS_REGNUM; | |
10008 | record_buf[1] = ARM_LR_REGNUM; | |
10009 | arm_insn_r->reg_rec_count = 2; | |
10010 | } | |
10011 | /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */ | |
10012 | } | |
10013 | ||
10014 | ||
10015 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
10016 | if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4)) | |
10017 | { | |
10018 | ret = -1; | |
10019 | /* Undefined instruction on ARM V5; need to handle if later | |
10020 | versions define it. */ | |
10021 | } | |
10022 | ||
10023 | opcode1 = bits (arm_insn_r->arm_insn, 24, 27); | |
10024 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10025 | insn_op1 = bits (arm_insn_r->arm_insn, 20, 23); | |
10026 | ||
10027 | /* Handle arithmetic insn extension space. */ | |
10028 | if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond | |
10029 | && !INSN_RECORDED(arm_insn_r)) | |
10030 | { | |
10031 | /* Handle MLA(S) and MUL(S). */ | |
b020ff80 | 10032 | if (in_inclusive_range (insn_op1, 0U, 3U)) |
72508ac0 PO |
10033 | { |
10034 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10035 | record_buf[1] = ARM_PS_REGNUM; | |
10036 | arm_insn_r->reg_rec_count = 2; | |
10037 | } | |
b020ff80 | 10038 | else if (in_inclusive_range (insn_op1, 4U, 15U)) |
72508ac0 PO |
10039 | { |
10040 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ | |
10041 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
10042 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10043 | record_buf[2] = ARM_PS_REGNUM; | |
10044 | arm_insn_r->reg_rec_count = 3; | |
10045 | } | |
10046 | } | |
10047 | ||
10048 | opcode1 = bits (arm_insn_r->arm_insn, 26, 27); | |
10049 | opcode2 = bits (arm_insn_r->arm_insn, 23, 24); | |
10050 | insn_op1 = bits (arm_insn_r->arm_insn, 21, 22); | |
10051 | ||
10052 | /* Handle control insn extension space. */ | |
10053 | ||
10054 | if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20) | |
10055 | && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r)) | |
10056 | { | |
10057 | if (!bit (arm_insn_r->arm_insn,25)) | |
10058 | { | |
10059 | if (!bits (arm_insn_r->arm_insn, 4, 7)) | |
10060 | { | |
10061 | if ((0 == insn_op1) || (2 == insn_op1)) | |
10062 | { | |
10063 | /* MRS. */ | |
10064 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10065 | arm_insn_r->reg_rec_count = 1; | |
10066 | } | |
10067 | else if (1 == insn_op1) | |
10068 | { | |
10069 | /* CSPR is going to be changed. */ | |
10070 | record_buf[0] = ARM_PS_REGNUM; | |
10071 | arm_insn_r->reg_rec_count = 1; | |
10072 | } | |
10073 | else if (3 == insn_op1) | |
10074 | { | |
10075 | /* SPSR is going to be changed. */ | |
10076 | /* We need to get SPSR value, which is yet to be done. */ | |
72508ac0 PO |
10077 | return -1; |
10078 | } | |
10079 | } | |
10080 | else if (1 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10081 | { | |
10082 | if (1 == insn_op1) | |
10083 | { | |
10084 | /* BX. */ | |
10085 | record_buf[0] = ARM_PS_REGNUM; | |
10086 | arm_insn_r->reg_rec_count = 1; | |
10087 | } | |
10088 | else if (3 == insn_op1) | |
10089 | { | |
10090 | /* CLZ. */ | |
10091 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10092 | arm_insn_r->reg_rec_count = 1; | |
10093 | } | |
10094 | } | |
10095 | else if (3 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10096 | { | |
10097 | /* BLX. */ | |
10098 | record_buf[0] = ARM_PS_REGNUM; | |
10099 | record_buf[1] = ARM_LR_REGNUM; | |
10100 | arm_insn_r->reg_rec_count = 2; | |
10101 | } | |
10102 | else if (5 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10103 | { | |
10104 | /* QADD, QSUB, QDADD, QDSUB */ | |
10105 | record_buf[0] = ARM_PS_REGNUM; | |
10106 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10107 | arm_insn_r->reg_rec_count = 2; | |
10108 | } | |
10109 | else if (7 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10110 | { | |
10111 | /* BKPT. */ | |
10112 | record_buf[0] = ARM_PS_REGNUM; | |
10113 | record_buf[1] = ARM_LR_REGNUM; | |
10114 | arm_insn_r->reg_rec_count = 2; | |
10115 | ||
10116 | /* Save SPSR also;how? */ | |
72508ac0 PO |
10117 | return -1; |
10118 | } | |
10119 | else if(8 == bits (arm_insn_r->arm_insn, 4, 7) | |
10120 | || 10 == bits (arm_insn_r->arm_insn, 4, 7) | |
10121 | || 12 == bits (arm_insn_r->arm_insn, 4, 7) | |
10122 | || 14 == bits (arm_insn_r->arm_insn, 4, 7) | |
10123 | ) | |
10124 | { | |
10125 | if (0 == insn_op1 || 1 == insn_op1) | |
10126 | { | |
10127 | /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */ | |
10128 | /* We dont do optimization for SMULW<y> where we | |
10129 | need only Rd. */ | |
10130 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10131 | record_buf[1] = ARM_PS_REGNUM; | |
10132 | arm_insn_r->reg_rec_count = 2; | |
10133 | } | |
10134 | else if (2 == insn_op1) | |
10135 | { | |
10136 | /* SMLAL<x><y>. */ | |
10137 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10138 | record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19); | |
10139 | arm_insn_r->reg_rec_count = 2; | |
10140 | } | |
10141 | else if (3 == insn_op1) | |
10142 | { | |
10143 | /* SMUL<x><y>. */ | |
10144 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10145 | arm_insn_r->reg_rec_count = 1; | |
10146 | } | |
10147 | } | |
10148 | } | |
10149 | else | |
10150 | { | |
10151 | /* MSR : immediate form. */ | |
10152 | if (1 == insn_op1) | |
10153 | { | |
10154 | /* CSPR is going to be changed. */ | |
10155 | record_buf[0] = ARM_PS_REGNUM; | |
10156 | arm_insn_r->reg_rec_count = 1; | |
10157 | } | |
10158 | else if (3 == insn_op1) | |
10159 | { | |
10160 | /* SPSR is going to be changed. */ | |
10161 | /* we need to get SPSR value, which is yet to be done */ | |
72508ac0 PO |
10162 | return -1; |
10163 | } | |
10164 | } | |
10165 | } | |
10166 | ||
10167 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
10168 | opcode2 = bits (arm_insn_r->arm_insn, 20, 24); | |
10169 | insn_op1 = bits (arm_insn_r->arm_insn, 5, 6); | |
10170 | ||
10171 | /* Handle load/store insn extension space. */ | |
10172 | ||
10173 | if (!opcode1 && bit (arm_insn_r->arm_insn, 7) | |
10174 | && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond | |
10175 | && !INSN_RECORDED(arm_insn_r)) | |
10176 | { | |
10177 | /* SWP/SWPB. */ | |
10178 | if (0 == insn_op1) | |
10179 | { | |
10180 | /* These insn, changes register and memory as well. */ | |
10181 | /* SWP or SWPB insn. */ | |
10182 | /* Get memory address given by Rn. */ | |
10183 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10184 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
10185 | /* SWP insn ?, swaps word. */ | |
10186 | if (8 == arm_insn_r->opcode) | |
10187 | { | |
10188 | record_buf_mem[0] = 4; | |
10189 | } | |
10190 | else | |
10191 | { | |
10192 | /* SWPB insn, swaps only byte. */ | |
10193 | record_buf_mem[0] = 1; | |
10194 | } | |
10195 | record_buf_mem[1] = u_regval; | |
10196 | arm_insn_r->mem_rec_count = 1; | |
10197 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10198 | arm_insn_r->reg_rec_count = 1; | |
10199 | } | |
10200 | else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
10201 | { | |
10202 | /* STRH. */ | |
10203 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
10204 | ARM_RECORD_STRH); | |
10205 | } | |
10206 | else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
10207 | { | |
10208 | /* LDRD. */ | |
10209 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10210 | record_buf[1] = record_buf[0] + 1; | |
10211 | arm_insn_r->reg_rec_count = 2; | |
10212 | } | |
10213 | else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
10214 | { | |
10215 | /* STRD. */ | |
10216 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
10217 | ARM_RECORD_STRD); | |
10218 | } | |
10219 | else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3) | |
10220 | { | |
10221 | /* LDRH, LDRSB, LDRSH. */ | |
10222 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10223 | arm_insn_r->reg_rec_count = 1; | |
10224 | } | |
10225 | ||
10226 | } | |
10227 | ||
10228 | opcode1 = bits (arm_insn_r->arm_insn, 23, 27); | |
10229 | if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21) | |
10230 | && !INSN_RECORDED(arm_insn_r)) | |
10231 | { | |
10232 | ret = -1; | |
10233 | /* Handle coprocessor insn extension space. */ | |
10234 | } | |
10235 | ||
10236 | /* To be done for ARMv5 and later; as of now we return -1. */ | |
10237 | if (-1 == ret) | |
ca92db2d | 10238 | return ret; |
72508ac0 PO |
10239 | |
10240 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
10241 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
10242 | ||
10243 | return ret; | |
10244 | } | |
10245 | ||
10246 | /* Handling opcode 000 insns. */ | |
10247 | ||
10248 | static int | |
10249 | arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r) | |
10250 | { | |
10251 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10252 | uint32_t record_buf[8], record_buf_mem[8]; | |
10253 | ULONGEST u_regval[2] = {0}; | |
10254 | ||
8d49165d | 10255 | uint32_t reg_src1 = 0; |
72508ac0 PO |
10256 | uint32_t opcode1 = 0; |
10257 | ||
10258 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
10259 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
10260 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
10261 | ||
2d9e6acb | 10262 | if (!((opcode1 & 0x19) == 0x10)) |
72508ac0 | 10263 | { |
2d9e6acb YQ |
10264 | /* Data-processing (register) and Data-processing (register-shifted |
10265 | register */ | |
10266 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
10267 | register, which is specified by 13-16 decode. */ | |
10268 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10269 | record_buf[1] = ARM_PS_REGNUM; | |
10270 | arm_insn_r->reg_rec_count = 2; | |
72508ac0 | 10271 | } |
2d9e6acb | 10272 | else if ((arm_insn_r->decode < 8) && ((opcode1 & 0x19) == 0x10)) |
72508ac0 | 10273 | { |
2d9e6acb YQ |
10274 | /* Miscellaneous instructions */ |
10275 | ||
10276 | if (3 == arm_insn_r->decode && 0x12 == opcode1 | |
10277 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
10278 | { | |
10279 | /* Handle BLX, branch and link/exchange. */ | |
10280 | if (9 == arm_insn_r->opcode) | |
10281 | { | |
10282 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm, | |
10283 | and R14 stores the return address. */ | |
10284 | record_buf[0] = ARM_PS_REGNUM; | |
10285 | record_buf[1] = ARM_LR_REGNUM; | |
10286 | arm_insn_r->reg_rec_count = 2; | |
10287 | } | |
10288 | } | |
10289 | else if (7 == arm_insn_r->decode && 0x12 == opcode1) | |
10290 | { | |
10291 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
10292 | /* CPSR is changed to be executed in ARM state, disabling normal | |
10293 | interrupts, entering abort mode. */ | |
10294 | /* According to high vector configuration PC is set. */ | |
10295 | /* user hit breakpoint and type reverse, in | |
10296 | that case, we need to go back with previous CPSR and | |
10297 | Program Counter. */ | |
10298 | record_buf[0] = ARM_PS_REGNUM; | |
10299 | record_buf[1] = ARM_LR_REGNUM; | |
10300 | arm_insn_r->reg_rec_count = 2; | |
10301 | ||
10302 | /* Save SPSR also; how? */ | |
10303 | return -1; | |
10304 | } | |
10305 | else if (1 == arm_insn_r->decode && 0x12 == opcode1 | |
10306 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
10307 | { | |
10308 | /* Handle BX, branch and link/exchange. */ | |
10309 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */ | |
10310 | record_buf[0] = ARM_PS_REGNUM; | |
10311 | arm_insn_r->reg_rec_count = 1; | |
10312 | } | |
10313 | else if (1 == arm_insn_r->decode && 0x16 == opcode1 | |
10314 | && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1) | |
10315 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)) | |
10316 | { | |
10317 | /* Count leading zeros: CLZ. */ | |
10318 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10319 | arm_insn_r->reg_rec_count = 1; | |
10320 | } | |
10321 | else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
10322 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
10323 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1) | |
10324 | && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0)) | |
10325 | { | |
10326 | /* Handle MRS insn. */ | |
10327 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10328 | arm_insn_r->reg_rec_count = 1; | |
10329 | } | |
72508ac0 | 10330 | } |
2d9e6acb | 10331 | else if (9 == arm_insn_r->decode && opcode1 < 0x10) |
72508ac0 | 10332 | { |
2d9e6acb YQ |
10333 | /* Multiply and multiply-accumulate */ |
10334 | ||
10335 | /* Handle multiply instructions. */ | |
10336 | /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */ | |
10337 | if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode) | |
10338 | { | |
10339 | /* Handle MLA and MUL. */ | |
10340 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
10341 | record_buf[1] = ARM_PS_REGNUM; | |
10342 | arm_insn_r->reg_rec_count = 2; | |
10343 | } | |
10344 | else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
10345 | { | |
10346 | /* Handle SMLAL, SMULL, UMLAL, UMULL. */ | |
10347 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
10348 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10349 | record_buf[2] = ARM_PS_REGNUM; | |
10350 | arm_insn_r->reg_rec_count = 3; | |
10351 | } | |
10352 | } | |
10353 | else if (9 == arm_insn_r->decode && opcode1 > 0x10) | |
10354 | { | |
10355 | /* Synchronization primitives */ | |
10356 | ||
72508ac0 PO |
10357 | /* Handling SWP, SWPB. */ |
10358 | /* These insn, changes register and memory as well. */ | |
10359 | /* SWP or SWPB insn. */ | |
10360 | ||
10361 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10362 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10363 | /* SWP insn ?, swaps word. */ | |
10364 | if (8 == arm_insn_r->opcode) | |
2d9e6acb YQ |
10365 | { |
10366 | record_buf_mem[0] = 4; | |
10367 | } | |
10368 | else | |
10369 | { | |
10370 | /* SWPB insn, swaps only byte. */ | |
10371 | record_buf_mem[0] = 1; | |
10372 | } | |
72508ac0 PO |
10373 | record_buf_mem[1] = u_regval[0]; |
10374 | arm_insn_r->mem_rec_count = 1; | |
10375 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10376 | arm_insn_r->reg_rec_count = 1; | |
10377 | } | |
2d9e6acb YQ |
10378 | else if (11 == arm_insn_r->decode || 13 == arm_insn_r->decode |
10379 | || 15 == arm_insn_r->decode) | |
72508ac0 | 10380 | { |
2d9e6acb YQ |
10381 | if ((opcode1 & 0x12) == 2) |
10382 | { | |
10383 | /* Extra load/store (unprivileged) */ | |
10384 | return -1; | |
10385 | } | |
10386 | else | |
10387 | { | |
10388 | /* Extra load/store */ | |
10389 | switch (bits (arm_insn_r->arm_insn, 5, 6)) | |
10390 | { | |
10391 | case 1: | |
10392 | if ((opcode1 & 0x05) == 0x0 || (opcode1 & 0x05) == 0x4) | |
10393 | { | |
10394 | /* STRH (register), STRH (immediate) */ | |
10395 | arm_record_strx (arm_insn_r, &record_buf[0], | |
10396 | &record_buf_mem[0], ARM_RECORD_STRH); | |
10397 | } | |
10398 | else if ((opcode1 & 0x05) == 0x1) | |
10399 | { | |
10400 | /* LDRH (register) */ | |
10401 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10402 | arm_insn_r->reg_rec_count = 1; | |
72508ac0 | 10403 | |
2d9e6acb YQ |
10404 | if (bit (arm_insn_r->arm_insn, 21)) |
10405 | { | |
10406 | /* Write back to Rn. */ | |
10407 | record_buf[arm_insn_r->reg_rec_count++] | |
10408 | = bits (arm_insn_r->arm_insn, 16, 19); | |
10409 | } | |
10410 | } | |
10411 | else if ((opcode1 & 0x05) == 0x5) | |
10412 | { | |
10413 | /* LDRH (immediate), LDRH (literal) */ | |
10414 | int rn = bits (arm_insn_r->arm_insn, 16, 19); | |
72508ac0 | 10415 | |
2d9e6acb YQ |
10416 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
10417 | arm_insn_r->reg_rec_count = 1; | |
10418 | ||
10419 | if (rn != 15) | |
10420 | { | |
10421 | /*LDRH (immediate) */ | |
10422 | if (bit (arm_insn_r->arm_insn, 21)) | |
10423 | { | |
10424 | /* Write back to Rn. */ | |
10425 | record_buf[arm_insn_r->reg_rec_count++] = rn; | |
10426 | } | |
10427 | } | |
10428 | } | |
10429 | else | |
10430 | return -1; | |
10431 | break; | |
10432 | case 2: | |
10433 | if ((opcode1 & 0x05) == 0x0) | |
10434 | { | |
10435 | /* LDRD (register) */ | |
10436 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10437 | record_buf[1] = record_buf[0] + 1; | |
10438 | arm_insn_r->reg_rec_count = 2; | |
10439 | ||
10440 | if (bit (arm_insn_r->arm_insn, 21)) | |
10441 | { | |
10442 | /* Write back to Rn. */ | |
10443 | record_buf[arm_insn_r->reg_rec_count++] | |
10444 | = bits (arm_insn_r->arm_insn, 16, 19); | |
10445 | } | |
10446 | } | |
10447 | else if ((opcode1 & 0x05) == 0x1) | |
10448 | { | |
10449 | /* LDRSB (register) */ | |
10450 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10451 | arm_insn_r->reg_rec_count = 1; | |
10452 | ||
10453 | if (bit (arm_insn_r->arm_insn, 21)) | |
10454 | { | |
10455 | /* Write back to Rn. */ | |
10456 | record_buf[arm_insn_r->reg_rec_count++] | |
10457 | = bits (arm_insn_r->arm_insn, 16, 19); | |
10458 | } | |
10459 | } | |
10460 | else if ((opcode1 & 0x05) == 0x4 || (opcode1 & 0x05) == 0x5) | |
10461 | { | |
10462 | /* LDRD (immediate), LDRD (literal), LDRSB (immediate), | |
10463 | LDRSB (literal) */ | |
10464 | int rn = bits (arm_insn_r->arm_insn, 16, 19); | |
10465 | ||
10466 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10467 | arm_insn_r->reg_rec_count = 1; | |
10468 | ||
10469 | if (rn != 15) | |
10470 | { | |
10471 | /*LDRD (immediate), LDRSB (immediate) */ | |
10472 | if (bit (arm_insn_r->arm_insn, 21)) | |
10473 | { | |
10474 | /* Write back to Rn. */ | |
10475 | record_buf[arm_insn_r->reg_rec_count++] = rn; | |
10476 | } | |
10477 | } | |
10478 | } | |
10479 | else | |
10480 | return -1; | |
10481 | break; | |
10482 | case 3: | |
10483 | if ((opcode1 & 0x05) == 0x0) | |
10484 | { | |
10485 | /* STRD (register) */ | |
10486 | arm_record_strx (arm_insn_r, &record_buf[0], | |
10487 | &record_buf_mem[0], ARM_RECORD_STRD); | |
10488 | } | |
10489 | else if ((opcode1 & 0x05) == 0x1) | |
10490 | { | |
10491 | /* LDRSH (register) */ | |
10492 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10493 | arm_insn_r->reg_rec_count = 1; | |
10494 | ||
10495 | if (bit (arm_insn_r->arm_insn, 21)) | |
10496 | { | |
10497 | /* Write back to Rn. */ | |
10498 | record_buf[arm_insn_r->reg_rec_count++] | |
10499 | = bits (arm_insn_r->arm_insn, 16, 19); | |
10500 | } | |
10501 | } | |
10502 | else if ((opcode1 & 0x05) == 0x4) | |
10503 | { | |
10504 | /* STRD (immediate) */ | |
10505 | arm_record_strx (arm_insn_r, &record_buf[0], | |
10506 | &record_buf_mem[0], ARM_RECORD_STRD); | |
10507 | } | |
10508 | else if ((opcode1 & 0x05) == 0x5) | |
10509 | { | |
10510 | /* LDRSH (immediate), LDRSH (literal) */ | |
10511 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10512 | arm_insn_r->reg_rec_count = 1; | |
10513 | ||
10514 | if (bit (arm_insn_r->arm_insn, 21)) | |
10515 | { | |
10516 | /* Write back to Rn. */ | |
10517 | record_buf[arm_insn_r->reg_rec_count++] | |
10518 | = bits (arm_insn_r->arm_insn, 16, 19); | |
10519 | } | |
10520 | } | |
10521 | else | |
10522 | return -1; | |
10523 | break; | |
10524 | default: | |
10525 | return -1; | |
10526 | } | |
10527 | } | |
72508ac0 PO |
10528 | } |
10529 | else | |
10530 | { | |
10531 | return -1; | |
10532 | } | |
10533 | ||
10534 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
10535 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
10536 | return 0; | |
10537 | } | |
10538 | ||
10539 | /* Handling opcode 001 insns. */ | |
10540 | ||
10541 | static int | |
10542 | arm_record_data_proc_imm (insn_decode_record *arm_insn_r) | |
10543 | { | |
10544 | uint32_t record_buf[8], record_buf_mem[8]; | |
10545 | ||
10546 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
10547 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
10548 | ||
10549 | if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
10550 | && 2 == bits (arm_insn_r->arm_insn, 20, 21) | |
10551 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
10552 | ) | |
10553 | { | |
10554 | /* Handle MSR insn. */ | |
10555 | if (9 == arm_insn_r->opcode) | |
10556 | { | |
10557 | /* CSPR is going to be changed. */ | |
10558 | record_buf[0] = ARM_PS_REGNUM; | |
10559 | arm_insn_r->reg_rec_count = 1; | |
10560 | } | |
10561 | else | |
10562 | { | |
10563 | /* SPSR is going to be changed. */ | |
10564 | } | |
10565 | } | |
10566 | else if (arm_insn_r->opcode <= 15) | |
10567 | { | |
10568 | /* Normal data processing insns. */ | |
10569 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
10570 | register, which is specified by 13-16 decode. */ | |
10571 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10572 | record_buf[1] = ARM_PS_REGNUM; | |
10573 | arm_insn_r->reg_rec_count = 2; | |
10574 | } | |
10575 | else | |
10576 | { | |
10577 | return -1; | |
10578 | } | |
10579 | ||
10580 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
10581 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
10582 | return 0; | |
10583 | } | |
10584 | ||
c55978a6 YQ |
10585 | static int |
10586 | arm_record_media (insn_decode_record *arm_insn_r) | |
10587 | { | |
10588 | uint32_t record_buf[8]; | |
10589 | ||
10590 | switch (bits (arm_insn_r->arm_insn, 22, 24)) | |
10591 | { | |
10592 | case 0: | |
10593 | /* Parallel addition and subtraction, signed */ | |
10594 | case 1: | |
10595 | /* Parallel addition and subtraction, unsigned */ | |
10596 | case 2: | |
10597 | case 3: | |
10598 | /* Packing, unpacking, saturation and reversal */ | |
10599 | { | |
10600 | int rd = bits (arm_insn_r->arm_insn, 12, 15); | |
10601 | ||
10602 | record_buf[arm_insn_r->reg_rec_count++] = rd; | |
10603 | } | |
10604 | break; | |
10605 | ||
10606 | case 4: | |
10607 | case 5: | |
10608 | /* Signed multiplies */ | |
10609 | { | |
10610 | int rd = bits (arm_insn_r->arm_insn, 16, 19); | |
10611 | unsigned int op1 = bits (arm_insn_r->arm_insn, 20, 22); | |
10612 | ||
10613 | record_buf[arm_insn_r->reg_rec_count++] = rd; | |
10614 | if (op1 == 0x0) | |
10615 | record_buf[arm_insn_r->reg_rec_count++] = ARM_PS_REGNUM; | |
10616 | else if (op1 == 0x4) | |
10617 | record_buf[arm_insn_r->reg_rec_count++] | |
10618 | = bits (arm_insn_r->arm_insn, 12, 15); | |
10619 | } | |
10620 | break; | |
10621 | ||
10622 | case 6: | |
10623 | { | |
10624 | if (bit (arm_insn_r->arm_insn, 21) | |
10625 | && bits (arm_insn_r->arm_insn, 5, 6) == 0x2) | |
10626 | { | |
10627 | /* SBFX */ | |
10628 | record_buf[arm_insn_r->reg_rec_count++] | |
10629 | = bits (arm_insn_r->arm_insn, 12, 15); | |
10630 | } | |
10631 | else if (bits (arm_insn_r->arm_insn, 20, 21) == 0x0 | |
10632 | && bits (arm_insn_r->arm_insn, 5, 7) == 0x0) | |
10633 | { | |
10634 | /* USAD8 and USADA8 */ | |
10635 | record_buf[arm_insn_r->reg_rec_count++] | |
10636 | = bits (arm_insn_r->arm_insn, 16, 19); | |
10637 | } | |
10638 | } | |
10639 | break; | |
10640 | ||
10641 | case 7: | |
10642 | { | |
10643 | if (bits (arm_insn_r->arm_insn, 20, 21) == 0x3 | |
10644 | && bits (arm_insn_r->arm_insn, 5, 7) == 0x7) | |
10645 | { | |
10646 | /* Permanently UNDEFINED */ | |
10647 | return -1; | |
10648 | } | |
10649 | else | |
10650 | { | |
10651 | /* BFC, BFI and UBFX */ | |
10652 | record_buf[arm_insn_r->reg_rec_count++] | |
10653 | = bits (arm_insn_r->arm_insn, 12, 15); | |
10654 | } | |
10655 | } | |
10656 | break; | |
10657 | ||
10658 | default: | |
10659 | return -1; | |
10660 | } | |
10661 | ||
10662 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
10663 | ||
10664 | return 0; | |
10665 | } | |
10666 | ||
71e396f9 | 10667 | /* Handle ARM mode instructions with opcode 010. */ |
72508ac0 PO |
10668 | |
10669 | static int | |
10670 | arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r) | |
10671 | { | |
10672 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10673 | ||
71e396f9 LM |
10674 | uint32_t reg_base , reg_dest; |
10675 | uint32_t offset_12, tgt_mem_addr; | |
72508ac0 | 10676 | uint32_t record_buf[8], record_buf_mem[8]; |
71e396f9 LM |
10677 | unsigned char wback; |
10678 | ULONGEST u_regval; | |
72508ac0 | 10679 | |
71e396f9 LM |
10680 | /* Calculate wback. */ |
10681 | wback = (bit (arm_insn_r->arm_insn, 24) == 0) | |
10682 | || (bit (arm_insn_r->arm_insn, 21) == 1); | |
72508ac0 | 10683 | |
71e396f9 LM |
10684 | arm_insn_r->reg_rec_count = 0; |
10685 | reg_base = bits (arm_insn_r->arm_insn, 16, 19); | |
72508ac0 PO |
10686 | |
10687 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
10688 | { | |
71e396f9 LM |
10689 | /* LDR (immediate), LDR (literal), LDRB (immediate), LDRB (literal), LDRBT |
10690 | and LDRT. */ | |
10691 | ||
72508ac0 | 10692 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); |
71e396f9 LM |
10693 | record_buf[arm_insn_r->reg_rec_count++] = reg_dest; |
10694 | ||
10695 | /* The LDR instruction is capable of doing branching. If MOV LR, PC | |
10696 | preceeds a LDR instruction having R15 as reg_base, it | |
10697 | emulates a branch and link instruction, and hence we need to save | |
10698 | CPSR and PC as well. */ | |
10699 | if (ARM_PC_REGNUM == reg_dest) | |
10700 | record_buf[arm_insn_r->reg_rec_count++] = ARM_PS_REGNUM; | |
10701 | ||
10702 | /* If wback is true, also save the base register, which is going to be | |
10703 | written to. */ | |
10704 | if (wback) | |
10705 | record_buf[arm_insn_r->reg_rec_count++] = reg_base; | |
72508ac0 PO |
10706 | } |
10707 | else | |
10708 | { | |
71e396f9 LM |
10709 | /* STR (immediate), STRB (immediate), STRBT and STRT. */ |
10710 | ||
72508ac0 | 10711 | offset_12 = bits (arm_insn_r->arm_insn, 0, 11); |
71e396f9 LM |
10712 | regcache_raw_read_unsigned (reg_cache, reg_base, &u_regval); |
10713 | ||
10714 | /* Handle bit U. */ | |
72508ac0 | 10715 | if (bit (arm_insn_r->arm_insn, 23)) |
71e396f9 LM |
10716 | { |
10717 | /* U == 1: Add the offset. */ | |
10718 | tgt_mem_addr = (uint32_t) u_regval + offset_12; | |
10719 | } | |
72508ac0 | 10720 | else |
71e396f9 LM |
10721 | { |
10722 | /* U == 0: subtract the offset. */ | |
10723 | tgt_mem_addr = (uint32_t) u_regval - offset_12; | |
10724 | } | |
10725 | ||
10726 | /* Bit 22 tells us whether the store instruction writes 1 byte or 4 | |
10727 | bytes. */ | |
10728 | if (bit (arm_insn_r->arm_insn, 22)) | |
10729 | { | |
10730 | /* STRB and STRBT: 1 byte. */ | |
10731 | record_buf_mem[0] = 1; | |
10732 | } | |
10733 | else | |
10734 | { | |
10735 | /* STR and STRT: 4 bytes. */ | |
10736 | record_buf_mem[0] = 4; | |
10737 | } | |
10738 | ||
10739 | /* Handle bit P. */ | |
10740 | if (bit (arm_insn_r->arm_insn, 24)) | |
10741 | record_buf_mem[1] = tgt_mem_addr; | |
10742 | else | |
10743 | record_buf_mem[1] = (uint32_t) u_regval; | |
72508ac0 | 10744 | |
72508ac0 PO |
10745 | arm_insn_r->mem_rec_count = 1; |
10746 | ||
71e396f9 LM |
10747 | /* If wback is true, also save the base register, which is going to be |
10748 | written to. */ | |
10749 | if (wback) | |
10750 | record_buf[arm_insn_r->reg_rec_count++] = reg_base; | |
72508ac0 PO |
10751 | } |
10752 | ||
10753 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
10754 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
10755 | return 0; | |
10756 | } | |
10757 | ||
10758 | /* Handling opcode 011 insns. */ | |
10759 | ||
10760 | static int | |
10761 | arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r) | |
10762 | { | |
10763 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10764 | ||
10765 | uint32_t shift_imm = 0; | |
10766 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
10767 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
10768 | uint32_t record_buf[8], record_buf_mem[8]; | |
10769 | ||
10770 | LONGEST s_word; | |
10771 | ULONGEST u_regval[2]; | |
10772 | ||
c55978a6 YQ |
10773 | if (bit (arm_insn_r->arm_insn, 4)) |
10774 | return arm_record_media (arm_insn_r); | |
10775 | ||
72508ac0 PO |
10776 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); |
10777 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
10778 | ||
10779 | /* Handle enhanced store insns and LDRD DSP insn, | |
10780 | order begins according to addressing modes for store insns | |
10781 | STRH insn. */ | |
10782 | ||
10783 | /* LDR or STR? */ | |
10784 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
10785 | { | |
10786 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
10787 | /* LDR insn has a capability to do branching, if | |
85102364 | 10788 | MOV LR, PC is preceded by LDR insn having Rn as R15 |
72508ac0 PO |
10789 | in that case, it emulates branch and link insn, and hence we |
10790 | need to save CSPR and PC as well. */ | |
10791 | if (15 != reg_dest) | |
10792 | { | |
10793 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10794 | arm_insn_r->reg_rec_count = 1; | |
10795 | } | |
10796 | else | |
10797 | { | |
10798 | record_buf[0] = reg_dest; | |
10799 | record_buf[1] = ARM_PS_REGNUM; | |
10800 | arm_insn_r->reg_rec_count = 2; | |
10801 | } | |
10802 | } | |
10803 | else | |
10804 | { | |
10805 | if (! bits (arm_insn_r->arm_insn, 4, 11)) | |
10806 | { | |
10807 | /* Store insn, register offset and register pre-indexed, | |
10808 | register post-indexed. */ | |
10809 | /* Get Rm. */ | |
10810 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10811 | /* Get Rn. */ | |
10812 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10813 | regcache_raw_read_unsigned (reg_cache, reg_src1 | |
10814 | , &u_regval[0]); | |
10815 | regcache_raw_read_unsigned (reg_cache, reg_src2 | |
10816 | , &u_regval[1]); | |
10817 | if (15 == reg_src2) | |
10818 | { | |
10819 | /* If R15 was used as Rn, hence current PC+8. */ | |
10820 | /* Pre-indexed mode doesnt reach here ; illegal insn. */ | |
10821 | u_regval[0] = u_regval[0] + 8; | |
10822 | } | |
10823 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10824 | /* U == 1. */ | |
10825 | if (bit (arm_insn_r->arm_insn, 23)) | |
10826 | { | |
10827 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10828 | } | |
10829 | else | |
10830 | { | |
10831 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10832 | } | |
10833 | ||
10834 | switch (arm_insn_r->opcode) | |
10835 | { | |
10836 | /* STR. */ | |
10837 | case 8: | |
10838 | case 12: | |
10839 | /* STR. */ | |
10840 | case 9: | |
10841 | case 13: | |
10842 | /* STRT. */ | |
10843 | case 1: | |
10844 | case 5: | |
10845 | /* STR. */ | |
10846 | case 0: | |
10847 | case 4: | |
10848 | record_buf_mem[0] = 4; | |
10849 | break; | |
10850 | ||
10851 | /* STRB. */ | |
10852 | case 10: | |
10853 | case 14: | |
10854 | /* STRB. */ | |
10855 | case 11: | |
10856 | case 15: | |
10857 | /* STRBT. */ | |
10858 | case 3: | |
10859 | case 7: | |
10860 | /* STRB. */ | |
10861 | case 2: | |
10862 | case 6: | |
10863 | record_buf_mem[0] = 1; | |
10864 | break; | |
10865 | ||
10866 | default: | |
10867 | gdb_assert_not_reached ("no decoding pattern found"); | |
10868 | break; | |
10869 | } | |
10870 | record_buf_mem[1] = tgt_mem_addr; | |
10871 | arm_insn_r->mem_rec_count = 1; | |
10872 | ||
10873 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
10874 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
10875 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
10876 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
10877 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
10878 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
10879 | ) | |
10880 | { | |
10881 | /* Rn is going to be changed in pre-indexed mode and | |
10882 | post-indexed mode as well. */ | |
10883 | record_buf[0] = reg_src2; | |
10884 | arm_insn_r->reg_rec_count = 1; | |
10885 | } | |
10886 | } | |
10887 | else | |
10888 | { | |
10889 | /* Store insn, scaled register offset; scaled pre-indexed. */ | |
10890 | offset_12 = bits (arm_insn_r->arm_insn, 5, 6); | |
10891 | /* Get Rm. */ | |
10892 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10893 | /* Get Rn. */ | |
10894 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10895 | /* Get shift_imm. */ | |
10896 | shift_imm = bits (arm_insn_r->arm_insn, 7, 11); | |
10897 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10898 | regcache_raw_read_signed (reg_cache, reg_src1, &s_word); | |
10899 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10900 | /* Offset_12 used as shift. */ | |
10901 | switch (offset_12) | |
10902 | { | |
10903 | case 0: | |
10904 | /* Offset_12 used as index. */ | |
10905 | offset_12 = u_regval[0] << shift_imm; | |
10906 | break; | |
10907 | ||
10908 | case 1: | |
10909 | offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm; | |
10910 | break; | |
10911 | ||
10912 | case 2: | |
10913 | if (!shift_imm) | |
10914 | { | |
10915 | if (bit (u_regval[0], 31)) | |
10916 | { | |
10917 | offset_12 = 0xFFFFFFFF; | |
10918 | } | |
10919 | else | |
10920 | { | |
10921 | offset_12 = 0; | |
10922 | } | |
10923 | } | |
10924 | else | |
10925 | { | |
10926 | /* This is arithmetic shift. */ | |
10927 | offset_12 = s_word >> shift_imm; | |
10928 | } | |
10929 | break; | |
10930 | ||
10931 | case 3: | |
10932 | if (!shift_imm) | |
10933 | { | |
10934 | regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM, | |
10935 | &u_regval[1]); | |
10936 | /* Get C flag value and shift it by 31. */ | |
10937 | offset_12 = (((bit (u_regval[1], 29)) << 31) \ | |
10938 | | (u_regval[0]) >> 1); | |
10939 | } | |
10940 | else | |
10941 | { | |
10942 | offset_12 = (u_regval[0] >> shift_imm) \ | |
10943 | | (u_regval[0] << | |
10944 | (sizeof(uint32_t) - shift_imm)); | |
10945 | } | |
10946 | break; | |
10947 | ||
10948 | default: | |
10949 | gdb_assert_not_reached ("no decoding pattern found"); | |
10950 | break; | |
10951 | } | |
10952 | ||
10953 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10954 | /* bit U set. */ | |
10955 | if (bit (arm_insn_r->arm_insn, 23)) | |
10956 | { | |
10957 | tgt_mem_addr = u_regval[1] + offset_12; | |
10958 | } | |
10959 | else | |
10960 | { | |
10961 | tgt_mem_addr = u_regval[1] - offset_12; | |
10962 | } | |
10963 | ||
10964 | switch (arm_insn_r->opcode) | |
10965 | { | |
10966 | /* STR. */ | |
10967 | case 8: | |
10968 | case 12: | |
10969 | /* STR. */ | |
10970 | case 9: | |
10971 | case 13: | |
10972 | /* STRT. */ | |
10973 | case 1: | |
10974 | case 5: | |
10975 | /* STR. */ | |
10976 | case 0: | |
10977 | case 4: | |
10978 | record_buf_mem[0] = 4; | |
10979 | break; | |
10980 | ||
10981 | /* STRB. */ | |
10982 | case 10: | |
10983 | case 14: | |
10984 | /* STRB. */ | |
10985 | case 11: | |
10986 | case 15: | |
10987 | /* STRBT. */ | |
10988 | case 3: | |
10989 | case 7: | |
10990 | /* STRB. */ | |
10991 | case 2: | |
10992 | case 6: | |
10993 | record_buf_mem[0] = 1; | |
10994 | break; | |
10995 | ||
10996 | default: | |
10997 | gdb_assert_not_reached ("no decoding pattern found"); | |
10998 | break; | |
10999 | } | |
11000 | record_buf_mem[1] = tgt_mem_addr; | |
11001 | arm_insn_r->mem_rec_count = 1; | |
11002 | ||
11003 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11004 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11005 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11006 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11007 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11008 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11009 | ) | |
11010 | { | |
11011 | /* Rn is going to be changed in register scaled pre-indexed | |
11012 | mode,and scaled post indexed mode. */ | |
11013 | record_buf[0] = reg_src2; | |
11014 | arm_insn_r->reg_rec_count = 1; | |
11015 | } | |
11016 | } | |
11017 | } | |
11018 | ||
11019 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11020 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11021 | return 0; | |
11022 | } | |
11023 | ||
71e396f9 | 11024 | /* Handle ARM mode instructions with opcode 100. */ |
72508ac0 PO |
11025 | |
11026 | static int | |
11027 | arm_record_ld_st_multiple (insn_decode_record *arm_insn_r) | |
11028 | { | |
11029 | struct regcache *reg_cache = arm_insn_r->regcache; | |
71e396f9 LM |
11030 | uint32_t register_count = 0, register_bits; |
11031 | uint32_t reg_base, addr_mode; | |
72508ac0 | 11032 | uint32_t record_buf[24], record_buf_mem[48]; |
71e396f9 LM |
11033 | uint32_t wback; |
11034 | ULONGEST u_regval; | |
72508ac0 | 11035 | |
71e396f9 LM |
11036 | /* Fetch the list of registers. */ |
11037 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11038 | arm_insn_r->reg_rec_count = 0; | |
11039 | ||
11040 | /* Fetch the base register that contains the address we are loading data | |
11041 | to. */ | |
11042 | reg_base = bits (arm_insn_r->arm_insn, 16, 19); | |
72508ac0 | 11043 | |
71e396f9 LM |
11044 | /* Calculate wback. */ |
11045 | wback = (bit (arm_insn_r->arm_insn, 21) == 1); | |
72508ac0 PO |
11046 | |
11047 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11048 | { | |
71e396f9 | 11049 | /* LDM/LDMIA/LDMFD, LDMDA/LDMFA, LDMDB and LDMIB. */ |
72508ac0 | 11050 | |
71e396f9 | 11051 | /* Find out which registers are going to be loaded from memory. */ |
72508ac0 | 11052 | while (register_bits) |
71e396f9 LM |
11053 | { |
11054 | if (register_bits & 0x00000001) | |
11055 | record_buf[arm_insn_r->reg_rec_count++] = register_count; | |
11056 | register_bits = register_bits >> 1; | |
11057 | register_count++; | |
11058 | } | |
72508ac0 | 11059 | |
71e396f9 LM |
11060 | |
11061 | /* If wback is true, also save the base register, which is going to be | |
11062 | written to. */ | |
11063 | if (wback) | |
11064 | record_buf[arm_insn_r->reg_rec_count++] = reg_base; | |
11065 | ||
11066 | /* Save the CPSR register. */ | |
11067 | record_buf[arm_insn_r->reg_rec_count++] = ARM_PS_REGNUM; | |
72508ac0 PO |
11068 | } |
11069 | else | |
11070 | { | |
71e396f9 | 11071 | /* STM (STMIA, STMEA), STMDA (STMED), STMDB (STMFD) and STMIB (STMFA). */ |
72508ac0 | 11072 | |
71e396f9 LM |
11073 | addr_mode = bits (arm_insn_r->arm_insn, 23, 24); |
11074 | ||
11075 | regcache_raw_read_unsigned (reg_cache, reg_base, &u_regval); | |
11076 | ||
11077 | /* Find out how many registers are going to be stored to memory. */ | |
72508ac0 | 11078 | while (register_bits) |
71e396f9 LM |
11079 | { |
11080 | if (register_bits & 0x00000001) | |
11081 | register_count++; | |
11082 | register_bits = register_bits >> 1; | |
11083 | } | |
72508ac0 PO |
11084 | |
11085 | switch (addr_mode) | |
71e396f9 LM |
11086 | { |
11087 | /* STMDA (STMED): Decrement after. */ | |
11088 | case 0: | |
11089 | record_buf_mem[1] = (uint32_t) u_regval | |
f0452268 | 11090 | - register_count * ARM_INT_REGISTER_SIZE + 4; |
71e396f9 LM |
11091 | break; |
11092 | /* STM (STMIA, STMEA): Increment after. */ | |
11093 | case 1: | |
11094 | record_buf_mem[1] = (uint32_t) u_regval; | |
11095 | break; | |
11096 | /* STMDB (STMFD): Decrement before. */ | |
11097 | case 2: | |
11098 | record_buf_mem[1] = (uint32_t) u_regval | |
f0452268 | 11099 | - register_count * ARM_INT_REGISTER_SIZE; |
71e396f9 LM |
11100 | break; |
11101 | /* STMIB (STMFA): Increment before. */ | |
11102 | case 3: | |
f0452268 | 11103 | record_buf_mem[1] = (uint32_t) u_regval + ARM_INT_REGISTER_SIZE; |
71e396f9 LM |
11104 | break; |
11105 | default: | |
11106 | gdb_assert_not_reached ("no decoding pattern found"); | |
11107 | break; | |
11108 | } | |
72508ac0 | 11109 | |
f0452268 | 11110 | record_buf_mem[0] = register_count * ARM_INT_REGISTER_SIZE; |
71e396f9 LM |
11111 | arm_insn_r->mem_rec_count = 1; |
11112 | ||
11113 | /* If wback is true, also save the base register, which is going to be | |
11114 | written to. */ | |
11115 | if (wback) | |
11116 | record_buf[arm_insn_r->reg_rec_count++] = reg_base; | |
72508ac0 PO |
11117 | } |
11118 | ||
11119 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11120 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11121 | return 0; | |
11122 | } | |
11123 | ||
11124 | /* Handling opcode 101 insns. */ | |
11125 | ||
11126 | static int | |
11127 | arm_record_b_bl (insn_decode_record *arm_insn_r) | |
11128 | { | |
11129 | uint32_t record_buf[8]; | |
11130 | ||
11131 | /* Handle B, BL, BLX(1) insns. */ | |
11132 | /* B simply branches so we do nothing here. */ | |
11133 | /* Note: BLX(1) doesnt fall here but instead it falls into | |
11134 | extension space. */ | |
11135 | if (bit (arm_insn_r->arm_insn, 24)) | |
11136 | { | |
11137 | record_buf[0] = ARM_LR_REGNUM; | |
11138 | arm_insn_r->reg_rec_count = 1; | |
11139 | } | |
11140 | ||
11141 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11142 | ||
11143 | return 0; | |
11144 | } | |
11145 | ||
72508ac0 | 11146 | static int |
c6ec2b30 | 11147 | arm_record_unsupported_insn (insn_decode_record *arm_insn_r) |
72508ac0 PO |
11148 | { |
11149 | printf_unfiltered (_("Process record does not support instruction " | |
01e57735 YQ |
11150 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, |
11151 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
72508ac0 PO |
11152 | |
11153 | return -1; | |
11154 | } | |
11155 | ||
5a578da5 OJ |
11156 | /* Record handler for vector data transfer instructions. */ |
11157 | ||
11158 | static int | |
11159 | arm_record_vdata_transfer_insn (insn_decode_record *arm_insn_r) | |
11160 | { | |
11161 | uint32_t bits_a, bit_c, bit_l, reg_t, reg_v; | |
11162 | uint32_t record_buf[4]; | |
11163 | ||
5a578da5 OJ |
11164 | reg_t = bits (arm_insn_r->arm_insn, 12, 15); |
11165 | reg_v = bits (arm_insn_r->arm_insn, 21, 23); | |
11166 | bits_a = bits (arm_insn_r->arm_insn, 21, 23); | |
11167 | bit_l = bit (arm_insn_r->arm_insn, 20); | |
11168 | bit_c = bit (arm_insn_r->arm_insn, 8); | |
11169 | ||
11170 | /* Handle VMOV instruction. */ | |
11171 | if (bit_l && bit_c) | |
11172 | { | |
11173 | record_buf[0] = reg_t; | |
11174 | arm_insn_r->reg_rec_count = 1; | |
11175 | } | |
11176 | else if (bit_l && !bit_c) | |
11177 | { | |
11178 | /* Handle VMOV instruction. */ | |
11179 | if (bits_a == 0x00) | |
11180 | { | |
f1771dce | 11181 | record_buf[0] = reg_t; |
5a578da5 OJ |
11182 | arm_insn_r->reg_rec_count = 1; |
11183 | } | |
11184 | /* Handle VMRS instruction. */ | |
11185 | else if (bits_a == 0x07) | |
11186 | { | |
11187 | if (reg_t == 15) | |
11188 | reg_t = ARM_PS_REGNUM; | |
11189 | ||
11190 | record_buf[0] = reg_t; | |
11191 | arm_insn_r->reg_rec_count = 1; | |
11192 | } | |
11193 | } | |
11194 | else if (!bit_l && !bit_c) | |
11195 | { | |
11196 | /* Handle VMOV instruction. */ | |
11197 | if (bits_a == 0x00) | |
11198 | { | |
f1771dce | 11199 | record_buf[0] = ARM_D0_REGNUM + reg_v; |
5a578da5 OJ |
11200 | |
11201 | arm_insn_r->reg_rec_count = 1; | |
11202 | } | |
11203 | /* Handle VMSR instruction. */ | |
11204 | else if (bits_a == 0x07) | |
11205 | { | |
11206 | record_buf[0] = ARM_FPSCR_REGNUM; | |
11207 | arm_insn_r->reg_rec_count = 1; | |
11208 | } | |
11209 | } | |
11210 | else if (!bit_l && bit_c) | |
11211 | { | |
11212 | /* Handle VMOV instruction. */ | |
11213 | if (!(bits_a & 0x04)) | |
11214 | { | |
11215 | record_buf[0] = (reg_v | (bit (arm_insn_r->arm_insn, 7) << 4)) | |
11216 | + ARM_D0_REGNUM; | |
11217 | arm_insn_r->reg_rec_count = 1; | |
11218 | } | |
11219 | /* Handle VDUP instruction. */ | |
11220 | else | |
11221 | { | |
11222 | if (bit (arm_insn_r->arm_insn, 21)) | |
11223 | { | |
11224 | reg_v = reg_v | (bit (arm_insn_r->arm_insn, 7) << 4); | |
11225 | record_buf[0] = reg_v + ARM_D0_REGNUM; | |
11226 | record_buf[1] = reg_v + ARM_D0_REGNUM + 1; | |
11227 | arm_insn_r->reg_rec_count = 2; | |
11228 | } | |
11229 | else | |
11230 | { | |
11231 | reg_v = reg_v | (bit (arm_insn_r->arm_insn, 7) << 4); | |
11232 | record_buf[0] = reg_v + ARM_D0_REGNUM; | |
11233 | arm_insn_r->reg_rec_count = 1; | |
11234 | } | |
11235 | } | |
11236 | } | |
11237 | ||
11238 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11239 | return 0; | |
11240 | } | |
11241 | ||
f20f80dd OJ |
11242 | /* Record handler for extension register load/store instructions. */ |
11243 | ||
11244 | static int | |
11245 | arm_record_exreg_ld_st_insn (insn_decode_record *arm_insn_r) | |
11246 | { | |
11247 | uint32_t opcode, single_reg; | |
11248 | uint8_t op_vldm_vstm; | |
11249 | uint32_t record_buf[8], record_buf_mem[128]; | |
11250 | ULONGEST u_regval = 0; | |
11251 | ||
11252 | struct regcache *reg_cache = arm_insn_r->regcache; | |
f20f80dd OJ |
11253 | |
11254 | opcode = bits (arm_insn_r->arm_insn, 20, 24); | |
9fde51ed | 11255 | single_reg = !bit (arm_insn_r->arm_insn, 8); |
f20f80dd OJ |
11256 | op_vldm_vstm = opcode & 0x1b; |
11257 | ||
11258 | /* Handle VMOV instructions. */ | |
11259 | if ((opcode & 0x1e) == 0x04) | |
11260 | { | |
9fde51ed | 11261 | if (bit (arm_insn_r->arm_insn, 20)) /* to_arm_registers bit 20? */ |
01e57735 YQ |
11262 | { |
11263 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11264 | record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19); | |
11265 | arm_insn_r->reg_rec_count = 2; | |
11266 | } | |
f20f80dd | 11267 | else |
01e57735 | 11268 | { |
9fde51ed YQ |
11269 | uint8_t reg_m = bits (arm_insn_r->arm_insn, 0, 3); |
11270 | uint8_t bit_m = bit (arm_insn_r->arm_insn, 5); | |
f20f80dd | 11271 | |
9fde51ed | 11272 | if (single_reg) |
01e57735 | 11273 | { |
9fde51ed YQ |
11274 | /* The first S register number m is REG_M:M (M is bit 5), |
11275 | the corresponding D register number is REG_M:M / 2, which | |
11276 | is REG_M. */ | |
11277 | record_buf[arm_insn_r->reg_rec_count++] = ARM_D0_REGNUM + reg_m; | |
11278 | /* The second S register number is REG_M:M + 1, the | |
11279 | corresponding D register number is (REG_M:M + 1) / 2. | |
11280 | IOW, if bit M is 1, the first and second S registers | |
11281 | are mapped to different D registers, otherwise, they are | |
11282 | in the same D register. */ | |
11283 | if (bit_m) | |
11284 | { | |
11285 | record_buf[arm_insn_r->reg_rec_count++] | |
11286 | = ARM_D0_REGNUM + reg_m + 1; | |
11287 | } | |
01e57735 YQ |
11288 | } |
11289 | else | |
11290 | { | |
9fde51ed | 11291 | record_buf[0] = ((bit_m << 4) + reg_m + ARM_D0_REGNUM); |
01e57735 YQ |
11292 | arm_insn_r->reg_rec_count = 1; |
11293 | } | |
11294 | } | |
f20f80dd OJ |
11295 | } |
11296 | /* Handle VSTM and VPUSH instructions. */ | |
11297 | else if (op_vldm_vstm == 0x08 || op_vldm_vstm == 0x0a | |
01e57735 | 11298 | || op_vldm_vstm == 0x12) |
f20f80dd OJ |
11299 | { |
11300 | uint32_t start_address, reg_rn, imm_off32, imm_off8, memory_count; | |
11301 | uint32_t memory_index = 0; | |
11302 | ||
11303 | reg_rn = bits (arm_insn_r->arm_insn, 16, 19); | |
11304 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval); | |
11305 | imm_off8 = bits (arm_insn_r->arm_insn, 0, 7); | |
9fde51ed | 11306 | imm_off32 = imm_off8 << 2; |
f20f80dd OJ |
11307 | memory_count = imm_off8; |
11308 | ||
11309 | if (bit (arm_insn_r->arm_insn, 23)) | |
01e57735 | 11310 | start_address = u_regval; |
f20f80dd | 11311 | else |
01e57735 | 11312 | start_address = u_regval - imm_off32; |
f20f80dd OJ |
11313 | |
11314 | if (bit (arm_insn_r->arm_insn, 21)) | |
01e57735 YQ |
11315 | { |
11316 | record_buf[0] = reg_rn; | |
11317 | arm_insn_r->reg_rec_count = 1; | |
11318 | } | |
f20f80dd OJ |
11319 | |
11320 | while (memory_count > 0) | |
01e57735 | 11321 | { |
9fde51ed | 11322 | if (single_reg) |
01e57735 | 11323 | { |
9fde51ed YQ |
11324 | record_buf_mem[memory_index] = 4; |
11325 | record_buf_mem[memory_index + 1] = start_address; | |
01e57735 YQ |
11326 | start_address = start_address + 4; |
11327 | memory_index = memory_index + 2; | |
11328 | } | |
11329 | else | |
11330 | { | |
9fde51ed YQ |
11331 | record_buf_mem[memory_index] = 4; |
11332 | record_buf_mem[memory_index + 1] = start_address; | |
11333 | record_buf_mem[memory_index + 2] = 4; | |
11334 | record_buf_mem[memory_index + 3] = start_address + 4; | |
01e57735 YQ |
11335 | start_address = start_address + 8; |
11336 | memory_index = memory_index + 4; | |
11337 | } | |
11338 | memory_count--; | |
11339 | } | |
f20f80dd OJ |
11340 | arm_insn_r->mem_rec_count = (memory_index >> 1); |
11341 | } | |
11342 | /* Handle VLDM instructions. */ | |
11343 | else if (op_vldm_vstm == 0x09 || op_vldm_vstm == 0x0b | |
01e57735 | 11344 | || op_vldm_vstm == 0x13) |
f20f80dd OJ |
11345 | { |
11346 | uint32_t reg_count, reg_vd; | |
11347 | uint32_t reg_index = 0; | |
9fde51ed | 11348 | uint32_t bit_d = bit (arm_insn_r->arm_insn, 22); |
f20f80dd OJ |
11349 | |
11350 | reg_vd = bits (arm_insn_r->arm_insn, 12, 15); | |
11351 | reg_count = bits (arm_insn_r->arm_insn, 0, 7); | |
11352 | ||
9fde51ed YQ |
11353 | /* REG_VD is the first D register number. If the instruction |
11354 | loads memory to S registers (SINGLE_REG is TRUE), the register | |
11355 | number is (REG_VD << 1 | bit D), so the corresponding D | |
11356 | register number is (REG_VD << 1 | bit D) / 2 = REG_VD. */ | |
11357 | if (!single_reg) | |
11358 | reg_vd = reg_vd | (bit_d << 4); | |
f20f80dd | 11359 | |
9fde51ed | 11360 | if (bit (arm_insn_r->arm_insn, 21) /* write back */) |
01e57735 | 11361 | record_buf[reg_index++] = bits (arm_insn_r->arm_insn, 16, 19); |
f20f80dd | 11362 | |
9fde51ed YQ |
11363 | /* If the instruction loads memory to D register, REG_COUNT should |
11364 | be divided by 2, according to the ARM Architecture Reference | |
11365 | Manual. If the instruction loads memory to S register, divide by | |
11366 | 2 as well because two S registers are mapped to D register. */ | |
11367 | reg_count = reg_count / 2; | |
11368 | if (single_reg && bit_d) | |
01e57735 | 11369 | { |
9fde51ed YQ |
11370 | /* Increase the register count if S register list starts from |
11371 | an odd number (bit d is one). */ | |
11372 | reg_count++; | |
11373 | } | |
f20f80dd | 11374 | |
9fde51ed YQ |
11375 | while (reg_count > 0) |
11376 | { | |
11377 | record_buf[reg_index++] = ARM_D0_REGNUM + reg_vd + reg_count - 1; | |
01e57735 YQ |
11378 | reg_count--; |
11379 | } | |
f20f80dd OJ |
11380 | arm_insn_r->reg_rec_count = reg_index; |
11381 | } | |
11382 | /* VSTR Vector store register. */ | |
11383 | else if ((opcode & 0x13) == 0x10) | |
11384 | { | |
bec2ab5a | 11385 | uint32_t start_address, reg_rn, imm_off32, imm_off8; |
f20f80dd OJ |
11386 | uint32_t memory_index = 0; |
11387 | ||
11388 | reg_rn = bits (arm_insn_r->arm_insn, 16, 19); | |
11389 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval); | |
11390 | imm_off8 = bits (arm_insn_r->arm_insn, 0, 7); | |
9fde51ed | 11391 | imm_off32 = imm_off8 << 2; |
f20f80dd OJ |
11392 | |
11393 | if (bit (arm_insn_r->arm_insn, 23)) | |
01e57735 | 11394 | start_address = u_regval + imm_off32; |
f20f80dd | 11395 | else |
01e57735 | 11396 | start_address = u_regval - imm_off32; |
f20f80dd OJ |
11397 | |
11398 | if (single_reg) | |
01e57735 | 11399 | { |
9fde51ed YQ |
11400 | record_buf_mem[memory_index] = 4; |
11401 | record_buf_mem[memory_index + 1] = start_address; | |
01e57735 YQ |
11402 | arm_insn_r->mem_rec_count = 1; |
11403 | } | |
f20f80dd | 11404 | else |
01e57735 | 11405 | { |
9fde51ed YQ |
11406 | record_buf_mem[memory_index] = 4; |
11407 | record_buf_mem[memory_index + 1] = start_address; | |
11408 | record_buf_mem[memory_index + 2] = 4; | |
11409 | record_buf_mem[memory_index + 3] = start_address + 4; | |
01e57735 YQ |
11410 | arm_insn_r->mem_rec_count = 2; |
11411 | } | |
f20f80dd OJ |
11412 | } |
11413 | /* VLDR Vector load register. */ | |
11414 | else if ((opcode & 0x13) == 0x11) | |
11415 | { | |
11416 | uint32_t reg_vd = bits (arm_insn_r->arm_insn, 12, 15); | |
11417 | ||
11418 | if (!single_reg) | |
01e57735 YQ |
11419 | { |
11420 | reg_vd = reg_vd | (bit (arm_insn_r->arm_insn, 22) << 4); | |
11421 | record_buf[0] = ARM_D0_REGNUM + reg_vd; | |
11422 | } | |
f20f80dd | 11423 | else |
01e57735 YQ |
11424 | { |
11425 | reg_vd = (reg_vd << 1) | bit (arm_insn_r->arm_insn, 22); | |
9fde51ed YQ |
11426 | /* Record register D rather than pseudo register S. */ |
11427 | record_buf[0] = ARM_D0_REGNUM + reg_vd / 2; | |
01e57735 | 11428 | } |
f20f80dd OJ |
11429 | arm_insn_r->reg_rec_count = 1; |
11430 | } | |
11431 | ||
11432 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11433 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11434 | return 0; | |
11435 | } | |
11436 | ||
851f26ae OJ |
11437 | /* Record handler for arm/thumb mode VFP data processing instructions. */ |
11438 | ||
11439 | static int | |
11440 | arm_record_vfp_data_proc_insn (insn_decode_record *arm_insn_r) | |
11441 | { | |
11442 | uint32_t opc1, opc2, opc3, dp_op_sz, bit_d, reg_vd; | |
11443 | uint32_t record_buf[4]; | |
11444 | enum insn_types {INSN_T0, INSN_T1, INSN_T2, INSN_T3, INSN_INV}; | |
11445 | enum insn_types curr_insn_type = INSN_INV; | |
11446 | ||
11447 | reg_vd = bits (arm_insn_r->arm_insn, 12, 15); | |
11448 | opc1 = bits (arm_insn_r->arm_insn, 20, 23); | |
11449 | opc2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11450 | opc3 = bits (arm_insn_r->arm_insn, 6, 7); | |
11451 | dp_op_sz = bit (arm_insn_r->arm_insn, 8); | |
11452 | bit_d = bit (arm_insn_r->arm_insn, 22); | |
ce887586 TT |
11453 | /* Mask off the "D" bit. */ |
11454 | opc1 = opc1 & ~0x04; | |
851f26ae OJ |
11455 | |
11456 | /* Handle VMLA, VMLS. */ | |
11457 | if (opc1 == 0x00) | |
11458 | { | |
11459 | if (bit (arm_insn_r->arm_insn, 10)) | |
11460 | { | |
11461 | if (bit (arm_insn_r->arm_insn, 6)) | |
11462 | curr_insn_type = INSN_T0; | |
11463 | else | |
11464 | curr_insn_type = INSN_T1; | |
11465 | } | |
11466 | else | |
11467 | { | |
11468 | if (dp_op_sz) | |
11469 | curr_insn_type = INSN_T1; | |
11470 | else | |
11471 | curr_insn_type = INSN_T2; | |
11472 | } | |
11473 | } | |
11474 | /* Handle VNMLA, VNMLS, VNMUL. */ | |
11475 | else if (opc1 == 0x01) | |
11476 | { | |
11477 | if (dp_op_sz) | |
11478 | curr_insn_type = INSN_T1; | |
11479 | else | |
11480 | curr_insn_type = INSN_T2; | |
11481 | } | |
11482 | /* Handle VMUL. */ | |
11483 | else if (opc1 == 0x02 && !(opc3 & 0x01)) | |
11484 | { | |
11485 | if (bit (arm_insn_r->arm_insn, 10)) | |
11486 | { | |
11487 | if (bit (arm_insn_r->arm_insn, 6)) | |
11488 | curr_insn_type = INSN_T0; | |
11489 | else | |
11490 | curr_insn_type = INSN_T1; | |
11491 | } | |
11492 | else | |
11493 | { | |
11494 | if (dp_op_sz) | |
11495 | curr_insn_type = INSN_T1; | |
11496 | else | |
11497 | curr_insn_type = INSN_T2; | |
11498 | } | |
11499 | } | |
11500 | /* Handle VADD, VSUB. */ | |
11501 | else if (opc1 == 0x03) | |
11502 | { | |
11503 | if (!bit (arm_insn_r->arm_insn, 9)) | |
11504 | { | |
11505 | if (bit (arm_insn_r->arm_insn, 6)) | |
11506 | curr_insn_type = INSN_T0; | |
11507 | else | |
11508 | curr_insn_type = INSN_T1; | |
11509 | } | |
11510 | else | |
11511 | { | |
11512 | if (dp_op_sz) | |
11513 | curr_insn_type = INSN_T1; | |
11514 | else | |
11515 | curr_insn_type = INSN_T2; | |
11516 | } | |
11517 | } | |
11518 | /* Handle VDIV. */ | |
ce887586 | 11519 | else if (opc1 == 0x08) |
851f26ae OJ |
11520 | { |
11521 | if (dp_op_sz) | |
11522 | curr_insn_type = INSN_T1; | |
11523 | else | |
11524 | curr_insn_type = INSN_T2; | |
11525 | } | |
11526 | /* Handle all other vfp data processing instructions. */ | |
11527 | else if (opc1 == 0x0b) | |
11528 | { | |
11529 | /* Handle VMOV. */ | |
11530 | if (!(opc3 & 0x01) || (opc2 == 0x00 && opc3 == 0x01)) | |
11531 | { | |
11532 | if (bit (arm_insn_r->arm_insn, 4)) | |
11533 | { | |
11534 | if (bit (arm_insn_r->arm_insn, 6)) | |
11535 | curr_insn_type = INSN_T0; | |
11536 | else | |
11537 | curr_insn_type = INSN_T1; | |
11538 | } | |
11539 | else | |
11540 | { | |
11541 | if (dp_op_sz) | |
11542 | curr_insn_type = INSN_T1; | |
11543 | else | |
11544 | curr_insn_type = INSN_T2; | |
11545 | } | |
11546 | } | |
11547 | /* Handle VNEG and VABS. */ | |
11548 | else if ((opc2 == 0x01 && opc3 == 0x01) | |
11549 | || (opc2 == 0x00 && opc3 == 0x03)) | |
11550 | { | |
11551 | if (!bit (arm_insn_r->arm_insn, 11)) | |
11552 | { | |
11553 | if (bit (arm_insn_r->arm_insn, 6)) | |
11554 | curr_insn_type = INSN_T0; | |
11555 | else | |
11556 | curr_insn_type = INSN_T1; | |
11557 | } | |
11558 | else | |
11559 | { | |
11560 | if (dp_op_sz) | |
11561 | curr_insn_type = INSN_T1; | |
11562 | else | |
11563 | curr_insn_type = INSN_T2; | |
11564 | } | |
11565 | } | |
11566 | /* Handle VSQRT. */ | |
11567 | else if (opc2 == 0x01 && opc3 == 0x03) | |
11568 | { | |
11569 | if (dp_op_sz) | |
11570 | curr_insn_type = INSN_T1; | |
11571 | else | |
11572 | curr_insn_type = INSN_T2; | |
11573 | } | |
11574 | /* Handle VCVT. */ | |
11575 | else if (opc2 == 0x07 && opc3 == 0x03) | |
11576 | { | |
11577 | if (!dp_op_sz) | |
11578 | curr_insn_type = INSN_T1; | |
11579 | else | |
11580 | curr_insn_type = INSN_T2; | |
11581 | } | |
11582 | else if (opc3 & 0x01) | |
11583 | { | |
11584 | /* Handle VCVT. */ | |
11585 | if ((opc2 == 0x08) || (opc2 & 0x0e) == 0x0c) | |
11586 | { | |
11587 | if (!bit (arm_insn_r->arm_insn, 18)) | |
11588 | curr_insn_type = INSN_T2; | |
11589 | else | |
11590 | { | |
11591 | if (dp_op_sz) | |
11592 | curr_insn_type = INSN_T1; | |
11593 | else | |
11594 | curr_insn_type = INSN_T2; | |
11595 | } | |
11596 | } | |
11597 | /* Handle VCVT. */ | |
11598 | else if ((opc2 & 0x0e) == 0x0a || (opc2 & 0x0e) == 0x0e) | |
11599 | { | |
11600 | if (dp_op_sz) | |
11601 | curr_insn_type = INSN_T1; | |
11602 | else | |
11603 | curr_insn_type = INSN_T2; | |
11604 | } | |
11605 | /* Handle VCVTB, VCVTT. */ | |
11606 | else if ((opc2 & 0x0e) == 0x02) | |
11607 | curr_insn_type = INSN_T2; | |
11608 | /* Handle VCMP, VCMPE. */ | |
11609 | else if ((opc2 & 0x0e) == 0x04) | |
11610 | curr_insn_type = INSN_T3; | |
11611 | } | |
11612 | } | |
11613 | ||
11614 | switch (curr_insn_type) | |
11615 | { | |
11616 | case INSN_T0: | |
11617 | reg_vd = reg_vd | (bit_d << 4); | |
11618 | record_buf[0] = reg_vd + ARM_D0_REGNUM; | |
11619 | record_buf[1] = reg_vd + ARM_D0_REGNUM + 1; | |
11620 | arm_insn_r->reg_rec_count = 2; | |
11621 | break; | |
11622 | ||
11623 | case INSN_T1: | |
11624 | reg_vd = reg_vd | (bit_d << 4); | |
11625 | record_buf[0] = reg_vd + ARM_D0_REGNUM; | |
11626 | arm_insn_r->reg_rec_count = 1; | |
11627 | break; | |
11628 | ||
11629 | case INSN_T2: | |
11630 | reg_vd = (reg_vd << 1) | bit_d; | |
11631 | record_buf[0] = reg_vd + ARM_D0_REGNUM; | |
11632 | arm_insn_r->reg_rec_count = 1; | |
11633 | break; | |
11634 | ||
11635 | case INSN_T3: | |
11636 | record_buf[0] = ARM_FPSCR_REGNUM; | |
11637 | arm_insn_r->reg_rec_count = 1; | |
11638 | break; | |
11639 | ||
11640 | default: | |
11641 | gdb_assert_not_reached ("no decoding pattern found"); | |
11642 | break; | |
11643 | } | |
11644 | ||
11645 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11646 | return 0; | |
11647 | } | |
11648 | ||
60cc5e93 OJ |
11649 | /* Handling opcode 110 insns. */ |
11650 | ||
11651 | static int | |
11652 | arm_record_asimd_vfp_coproc (insn_decode_record *arm_insn_r) | |
11653 | { | |
bec2ab5a | 11654 | uint32_t op1, op1_ebit, coproc; |
60cc5e93 OJ |
11655 | |
11656 | coproc = bits (arm_insn_r->arm_insn, 8, 11); | |
11657 | op1 = bits (arm_insn_r->arm_insn, 20, 25); | |
11658 | op1_ebit = bit (arm_insn_r->arm_insn, 20); | |
11659 | ||
11660 | if ((coproc & 0x0e) == 0x0a) | |
11661 | { | |
11662 | /* Handle extension register ld/st instructions. */ | |
11663 | if (!(op1 & 0x20)) | |
f20f80dd | 11664 | return arm_record_exreg_ld_st_insn (arm_insn_r); |
60cc5e93 OJ |
11665 | |
11666 | /* 64-bit transfers between arm core and extension registers. */ | |
11667 | if ((op1 & 0x3e) == 0x04) | |
f20f80dd | 11668 | return arm_record_exreg_ld_st_insn (arm_insn_r); |
60cc5e93 OJ |
11669 | } |
11670 | else | |
11671 | { | |
11672 | /* Handle coprocessor ld/st instructions. */ | |
11673 | if (!(op1 & 0x3a)) | |
11674 | { | |
11675 | /* Store. */ | |
11676 | if (!op1_ebit) | |
11677 | return arm_record_unsupported_insn (arm_insn_r); | |
11678 | else | |
11679 | /* Load. */ | |
11680 | return arm_record_unsupported_insn (arm_insn_r); | |
11681 | } | |
11682 | ||
11683 | /* Move to coprocessor from two arm core registers. */ | |
11684 | if (op1 == 0x4) | |
11685 | return arm_record_unsupported_insn (arm_insn_r); | |
11686 | ||
11687 | /* Move to two arm core registers from coprocessor. */ | |
11688 | if (op1 == 0x5) | |
11689 | { | |
11690 | uint32_t reg_t[2]; | |
11691 | ||
11692 | reg_t[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11693 | reg_t[1] = bits (arm_insn_r->arm_insn, 16, 19); | |
11694 | arm_insn_r->reg_rec_count = 2; | |
11695 | ||
11696 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, reg_t); | |
11697 | return 0; | |
11698 | } | |
11699 | } | |
11700 | return arm_record_unsupported_insn (arm_insn_r); | |
11701 | } | |
11702 | ||
72508ac0 PO |
11703 | /* Handling opcode 111 insns. */ |
11704 | ||
11705 | static int | |
11706 | arm_record_coproc_data_proc (insn_decode_record *arm_insn_r) | |
11707 | { | |
2d9e6acb | 11708 | uint32_t op, op1_ebit, coproc, bits_24_25; |
72508ac0 PO |
11709 | struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch); |
11710 | struct regcache *reg_cache = arm_insn_r->regcache; | |
72508ac0 PO |
11711 | |
11712 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27); | |
60cc5e93 | 11713 | coproc = bits (arm_insn_r->arm_insn, 8, 11); |
60cc5e93 OJ |
11714 | op1_ebit = bit (arm_insn_r->arm_insn, 20); |
11715 | op = bit (arm_insn_r->arm_insn, 4); | |
2d9e6acb | 11716 | bits_24_25 = bits (arm_insn_r->arm_insn, 24, 25); |
97dfe206 OJ |
11717 | |
11718 | /* Handle arm SWI/SVC system call instructions. */ | |
2d9e6acb | 11719 | if (bits_24_25 == 0x3) |
97dfe206 OJ |
11720 | { |
11721 | if (tdep->arm_syscall_record != NULL) | |
11722 | { | |
11723 | ULONGEST svc_operand, svc_number; | |
11724 | ||
11725 | svc_operand = (0x00ffffff & arm_insn_r->arm_insn); | |
11726 | ||
11727 | if (svc_operand) /* OABI. */ | |
11728 | svc_number = svc_operand - 0x900000; | |
11729 | else /* EABI. */ | |
11730 | regcache_raw_read_unsigned (reg_cache, 7, &svc_number); | |
11731 | ||
60cc5e93 | 11732 | return tdep->arm_syscall_record (reg_cache, svc_number); |
97dfe206 OJ |
11733 | } |
11734 | else | |
11735 | { | |
11736 | printf_unfiltered (_("no syscall record support\n")); | |
60cc5e93 | 11737 | return -1; |
97dfe206 OJ |
11738 | } |
11739 | } | |
2d9e6acb | 11740 | else if (bits_24_25 == 0x02) |
60cc5e93 | 11741 | { |
2d9e6acb YQ |
11742 | if (op) |
11743 | { | |
11744 | if ((coproc & 0x0e) == 0x0a) | |
11745 | { | |
11746 | /* 8, 16, and 32-bit transfer */ | |
11747 | return arm_record_vdata_transfer_insn (arm_insn_r); | |
11748 | } | |
11749 | else | |
11750 | { | |
11751 | if (op1_ebit) | |
11752 | { | |
11753 | /* MRC, MRC2 */ | |
11754 | uint32_t record_buf[1]; | |
11755 | ||
11756 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11757 | if (record_buf[0] == 15) | |
11758 | record_buf[0] = ARM_PS_REGNUM; | |
60cc5e93 | 11759 | |
2d9e6acb YQ |
11760 | arm_insn_r->reg_rec_count = 1; |
11761 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, | |
11762 | record_buf); | |
11763 | return 0; | |
11764 | } | |
11765 | else | |
11766 | { | |
11767 | /* MCR, MCR2 */ | |
11768 | return -1; | |
11769 | } | |
11770 | } | |
11771 | } | |
11772 | else | |
11773 | { | |
11774 | if ((coproc & 0x0e) == 0x0a) | |
11775 | { | |
11776 | /* VFP data-processing instructions. */ | |
11777 | return arm_record_vfp_data_proc_insn (arm_insn_r); | |
11778 | } | |
11779 | else | |
11780 | { | |
11781 | /* CDP, CDP2 */ | |
11782 | return -1; | |
11783 | } | |
11784 | } | |
60cc5e93 | 11785 | } |
97dfe206 OJ |
11786 | else |
11787 | { | |
2d9e6acb | 11788 | unsigned int op1 = bits (arm_insn_r->arm_insn, 20, 25); |
60cc5e93 | 11789 | |
2d9e6acb YQ |
11790 | if (op1 == 5) |
11791 | { | |
11792 | if ((coproc & 0x0e) != 0x0a) | |
11793 | { | |
11794 | /* MRRC, MRRC2 */ | |
11795 | return -1; | |
11796 | } | |
11797 | } | |
11798 | else if (op1 == 4 || op1 == 5) | |
11799 | { | |
11800 | if ((coproc & 0x0e) == 0x0a) | |
11801 | { | |
11802 | /* 64-bit transfers between ARM core and extension */ | |
11803 | return -1; | |
11804 | } | |
11805 | else if (op1 == 4) | |
11806 | { | |
11807 | /* MCRR, MCRR2 */ | |
11808 | return -1; | |
11809 | } | |
11810 | } | |
11811 | else if (op1 == 0 || op1 == 1) | |
11812 | { | |
11813 | /* UNDEFINED */ | |
11814 | return -1; | |
11815 | } | |
11816 | else | |
11817 | { | |
11818 | if ((coproc & 0x0e) == 0x0a) | |
11819 | { | |
11820 | /* Extension register load/store */ | |
11821 | } | |
11822 | else | |
11823 | { | |
11824 | /* STC, STC2, LDC, LDC2 */ | |
11825 | } | |
11826 | return -1; | |
11827 | } | |
97dfe206 | 11828 | } |
72508ac0 | 11829 | |
2d9e6acb | 11830 | return -1; |
72508ac0 PO |
11831 | } |
11832 | ||
11833 | /* Handling opcode 000 insns. */ | |
11834 | ||
11835 | static int | |
11836 | thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r) | |
11837 | { | |
11838 | uint32_t record_buf[8]; | |
11839 | uint32_t reg_src1 = 0; | |
11840 | ||
11841 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
11842 | ||
11843 | record_buf[0] = ARM_PS_REGNUM; | |
11844 | record_buf[1] = reg_src1; | |
11845 | thumb_insn_r->reg_rec_count = 2; | |
11846 | ||
11847 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11848 | ||
11849 | return 0; | |
11850 | } | |
11851 | ||
11852 | ||
11853 | /* Handling opcode 001 insns. */ | |
11854 | ||
11855 | static int | |
11856 | thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r) | |
11857 | { | |
11858 | uint32_t record_buf[8]; | |
11859 | uint32_t reg_src1 = 0; | |
11860 | ||
11861 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
11862 | ||
11863 | record_buf[0] = ARM_PS_REGNUM; | |
11864 | record_buf[1] = reg_src1; | |
11865 | thumb_insn_r->reg_rec_count = 2; | |
11866 | ||
11867 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11868 | ||
11869 | return 0; | |
11870 | } | |
11871 | ||
11872 | /* Handling opcode 010 insns. */ | |
11873 | ||
11874 | static int | |
11875 | thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r) | |
11876 | { | |
11877 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
11878 | uint32_t record_buf[8], record_buf_mem[8]; | |
11879 | ||
11880 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
11881 | uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0; | |
11882 | ||
11883 | ULONGEST u_regval[2] = {0}; | |
11884 | ||
11885 | opcode1 = bits (thumb_insn_r->arm_insn, 10, 12); | |
11886 | ||
11887 | if (bit (thumb_insn_r->arm_insn, 12)) | |
11888 | { | |
11889 | /* Handle load/store register offset. */ | |
b121eeb9 YQ |
11890 | uint32_t opB = bits (thumb_insn_r->arm_insn, 9, 11); |
11891 | ||
b020ff80 | 11892 | if (in_inclusive_range (opB, 4U, 7U)) |
72508ac0 PO |
11893 | { |
11894 | /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */ | |
11895 | reg_src1 = bits (thumb_insn_r->arm_insn,0, 2); | |
11896 | record_buf[0] = reg_src1; | |
11897 | thumb_insn_r->reg_rec_count = 1; | |
11898 | } | |
b020ff80 | 11899 | else if (in_inclusive_range (opB, 0U, 2U)) |
72508ac0 PO |
11900 | { |
11901 | /* STR(2), STRB(2), STRH(2) . */ | |
11902 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
11903 | reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8); | |
11904 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11905 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
b121eeb9 | 11906 | if (0 == opB) |
72508ac0 | 11907 | record_buf_mem[0] = 4; /* STR (2). */ |
b121eeb9 | 11908 | else if (2 == opB) |
72508ac0 | 11909 | record_buf_mem[0] = 1; /* STRB (2). */ |
b121eeb9 | 11910 | else if (1 == opB) |
72508ac0 PO |
11911 | record_buf_mem[0] = 2; /* STRH (2). */ |
11912 | record_buf_mem[1] = u_regval[0] + u_regval[1]; | |
11913 | thumb_insn_r->mem_rec_count = 1; | |
11914 | } | |
11915 | } | |
11916 | else if (bit (thumb_insn_r->arm_insn, 11)) | |
11917 | { | |
11918 | /* Handle load from literal pool. */ | |
11919 | /* LDR(3). */ | |
11920 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
11921 | record_buf[0] = reg_src1; | |
11922 | thumb_insn_r->reg_rec_count = 1; | |
11923 | } | |
11924 | else if (opcode1) | |
11925 | { | |
b121eeb9 | 11926 | /* Special data instructions and branch and exchange */ |
72508ac0 PO |
11927 | opcode2 = bits (thumb_insn_r->arm_insn, 8, 9); |
11928 | opcode3 = bits (thumb_insn_r->arm_insn, 0, 2); | |
11929 | if ((3 == opcode2) && (!opcode3)) | |
11930 | { | |
11931 | /* Branch with exchange. */ | |
11932 | record_buf[0] = ARM_PS_REGNUM; | |
11933 | thumb_insn_r->reg_rec_count = 1; | |
11934 | } | |
11935 | else | |
11936 | { | |
1f33efec YQ |
11937 | /* Format 8; special data processing insns. */ |
11938 | record_buf[0] = ARM_PS_REGNUM; | |
11939 | record_buf[1] = (bit (thumb_insn_r->arm_insn, 7) << 3 | |
11940 | | bits (thumb_insn_r->arm_insn, 0, 2)); | |
72508ac0 PO |
11941 | thumb_insn_r->reg_rec_count = 2; |
11942 | } | |
11943 | } | |
11944 | else | |
11945 | { | |
11946 | /* Format 5; data processing insns. */ | |
11947 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
11948 | if (bit (thumb_insn_r->arm_insn, 7)) | |
11949 | { | |
11950 | reg_src1 = reg_src1 + 8; | |
11951 | } | |
11952 | record_buf[0] = ARM_PS_REGNUM; | |
11953 | record_buf[1] = reg_src1; | |
11954 | thumb_insn_r->reg_rec_count = 2; | |
11955 | } | |
11956 | ||
11957 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11958 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
11959 | record_buf_mem); | |
11960 | ||
11961 | return 0; | |
11962 | } | |
11963 | ||
11964 | /* Handling opcode 001 insns. */ | |
11965 | ||
11966 | static int | |
11967 | thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r) | |
11968 | { | |
11969 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
11970 | uint32_t record_buf[8], record_buf_mem[8]; | |
11971 | ||
11972 | uint32_t reg_src1 = 0; | |
11973 | uint32_t opcode = 0, immed_5 = 0; | |
11974 | ||
11975 | ULONGEST u_regval = 0; | |
11976 | ||
11977 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
11978 | ||
11979 | if (opcode) | |
11980 | { | |
11981 | /* LDR(1). */ | |
11982 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
11983 | record_buf[0] = reg_src1; | |
11984 | thumb_insn_r->reg_rec_count = 1; | |
11985 | } | |
11986 | else | |
11987 | { | |
11988 | /* STR(1). */ | |
11989 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
11990 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
11991 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11992 | record_buf_mem[0] = 4; | |
11993 | record_buf_mem[1] = u_regval + (immed_5 * 4); | |
11994 | thumb_insn_r->mem_rec_count = 1; | |
11995 | } | |
11996 | ||
11997 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11998 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
11999 | record_buf_mem); | |
12000 | ||
12001 | return 0; | |
12002 | } | |
12003 | ||
12004 | /* Handling opcode 100 insns. */ | |
12005 | ||
12006 | static int | |
12007 | thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r) | |
12008 | { | |
12009 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12010 | uint32_t record_buf[8], record_buf_mem[8]; | |
12011 | ||
12012 | uint32_t reg_src1 = 0; | |
12013 | uint32_t opcode = 0, immed_8 = 0, immed_5 = 0; | |
12014 | ||
12015 | ULONGEST u_regval = 0; | |
12016 | ||
12017 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12018 | ||
12019 | if (3 == opcode) | |
12020 | { | |
12021 | /* LDR(4). */ | |
12022 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12023 | record_buf[0] = reg_src1; | |
12024 | thumb_insn_r->reg_rec_count = 1; | |
12025 | } | |
12026 | else if (1 == opcode) | |
12027 | { | |
12028 | /* LDRH(1). */ | |
12029 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12030 | record_buf[0] = reg_src1; | |
12031 | thumb_insn_r->reg_rec_count = 1; | |
12032 | } | |
12033 | else if (2 == opcode) | |
12034 | { | |
12035 | /* STR(3). */ | |
12036 | immed_8 = bits (thumb_insn_r->arm_insn, 0, 7); | |
12037 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); | |
12038 | record_buf_mem[0] = 4; | |
12039 | record_buf_mem[1] = u_regval + (immed_8 * 4); | |
12040 | thumb_insn_r->mem_rec_count = 1; | |
12041 | } | |
12042 | else if (0 == opcode) | |
12043 | { | |
12044 | /* STRH(1). */ | |
12045 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12046 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12047 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12048 | record_buf_mem[0] = 2; | |
12049 | record_buf_mem[1] = u_regval + (immed_5 * 2); | |
12050 | thumb_insn_r->mem_rec_count = 1; | |
12051 | } | |
12052 | ||
12053 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12054 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12055 | record_buf_mem); | |
12056 | ||
12057 | return 0; | |
12058 | } | |
12059 | ||
12060 | /* Handling opcode 101 insns. */ | |
12061 | ||
12062 | static int | |
12063 | thumb_record_misc (insn_decode_record *thumb_insn_r) | |
12064 | { | |
12065 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12066 | ||
b121eeb9 | 12067 | uint32_t opcode = 0; |
72508ac0 | 12068 | uint32_t register_bits = 0, register_count = 0; |
bec2ab5a | 12069 | uint32_t index = 0, start_address = 0; |
72508ac0 PO |
12070 | uint32_t record_buf[24], record_buf_mem[48]; |
12071 | uint32_t reg_src1; | |
12072 | ||
12073 | ULONGEST u_regval = 0; | |
12074 | ||
12075 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
72508ac0 | 12076 | |
b121eeb9 | 12077 | if (opcode == 0 || opcode == 1) |
72508ac0 | 12078 | { |
b121eeb9 YQ |
12079 | /* ADR and ADD (SP plus immediate) */ |
12080 | ||
72508ac0 PO |
12081 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
12082 | record_buf[0] = reg_src1; | |
12083 | thumb_insn_r->reg_rec_count = 1; | |
12084 | } | |
b121eeb9 | 12085 | else |
72508ac0 | 12086 | { |
b121eeb9 YQ |
12087 | /* Miscellaneous 16-bit instructions */ |
12088 | uint32_t opcode2 = bits (thumb_insn_r->arm_insn, 8, 11); | |
12089 | ||
12090 | switch (opcode2) | |
12091 | { | |
12092 | case 6: | |
12093 | /* SETEND and CPS */ | |
12094 | break; | |
12095 | case 0: | |
12096 | /* ADD/SUB (SP plus immediate) */ | |
12097 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12098 | record_buf[0] = ARM_SP_REGNUM; | |
12099 | thumb_insn_r->reg_rec_count = 1; | |
12100 | break; | |
12101 | case 1: /* fall through */ | |
12102 | case 3: /* fall through */ | |
12103 | case 9: /* fall through */ | |
12104 | case 11: | |
12105 | /* CBNZ, CBZ */ | |
b121eeb9 YQ |
12106 | break; |
12107 | case 2: | |
12108 | /* SXTH, SXTB, UXTH, UXTB */ | |
12109 | record_buf[0] = bits (thumb_insn_r->arm_insn, 0, 2); | |
12110 | thumb_insn_r->reg_rec_count = 1; | |
12111 | break; | |
12112 | case 4: /* fall through */ | |
12113 | case 5: | |
12114 | /* PUSH. */ | |
12115 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12116 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); | |
12117 | while (register_bits) | |
12118 | { | |
12119 | if (register_bits & 0x00000001) | |
12120 | register_count++; | |
12121 | register_bits = register_bits >> 1; | |
12122 | } | |
12123 | start_address = u_regval - \ | |
12124 | (4 * (bit (thumb_insn_r->arm_insn, 8) + register_count)); | |
12125 | thumb_insn_r->mem_rec_count = register_count; | |
12126 | while (register_count) | |
12127 | { | |
12128 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12129 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12130 | start_address = start_address + 4; | |
12131 | register_count--; | |
12132 | } | |
12133 | record_buf[0] = ARM_SP_REGNUM; | |
12134 | thumb_insn_r->reg_rec_count = 1; | |
12135 | break; | |
12136 | case 10: | |
12137 | /* REV, REV16, REVSH */ | |
ba14f379 YQ |
12138 | record_buf[0] = bits (thumb_insn_r->arm_insn, 0, 2); |
12139 | thumb_insn_r->reg_rec_count = 1; | |
b121eeb9 YQ |
12140 | break; |
12141 | case 12: /* fall through */ | |
12142 | case 13: | |
12143 | /* POP. */ | |
12144 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12145 | while (register_bits) | |
12146 | { | |
12147 | if (register_bits & 0x00000001) | |
12148 | record_buf[index++] = register_count; | |
12149 | register_bits = register_bits >> 1; | |
12150 | register_count++; | |
12151 | } | |
12152 | record_buf[index++] = ARM_PS_REGNUM; | |
12153 | record_buf[index++] = ARM_SP_REGNUM; | |
12154 | thumb_insn_r->reg_rec_count = index; | |
12155 | break; | |
12156 | case 0xe: | |
12157 | /* BKPT insn. */ | |
12158 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
12159 | /* CPSR is changed to be executed in ARM state, disabling normal | |
12160 | interrupts, entering abort mode. */ | |
12161 | /* According to high vector configuration PC is set. */ | |
12162 | /* User hits breakpoint and type reverse, in that case, we need to go back with | |
12163 | previous CPSR and Program Counter. */ | |
12164 | record_buf[0] = ARM_PS_REGNUM; | |
12165 | record_buf[1] = ARM_LR_REGNUM; | |
12166 | thumb_insn_r->reg_rec_count = 2; | |
12167 | /* We need to save SPSR value, which is not yet done. */ | |
12168 | printf_unfiltered (_("Process record does not support instruction " | |
12169 | "0x%0x at address %s.\n"), | |
12170 | thumb_insn_r->arm_insn, | |
12171 | paddress (thumb_insn_r->gdbarch, | |
12172 | thumb_insn_r->this_addr)); | |
12173 | return -1; | |
12174 | ||
12175 | case 0xf: | |
12176 | /* If-Then, and hints */ | |
12177 | break; | |
12178 | default: | |
12179 | return -1; | |
12180 | }; | |
72508ac0 PO |
12181 | } |
12182 | ||
12183 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12184 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12185 | record_buf_mem); | |
12186 | ||
12187 | return 0; | |
12188 | } | |
12189 | ||
12190 | /* Handling opcode 110 insns. */ | |
12191 | ||
12192 | static int | |
12193 | thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r) | |
12194 | { | |
12195 | struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch); | |
12196 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12197 | ||
12198 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
12199 | uint32_t reg_src1 = 0; | |
12200 | uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count = 0; | |
bec2ab5a | 12201 | uint32_t index = 0, start_address = 0; |
72508ac0 PO |
12202 | uint32_t record_buf[24], record_buf_mem[48]; |
12203 | ||
12204 | ULONGEST u_regval = 0; | |
12205 | ||
12206 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12207 | opcode2 = bits (thumb_insn_r->arm_insn, 11, 12); | |
12208 | ||
12209 | if (1 == opcode2) | |
12210 | { | |
12211 | ||
12212 | /* LDMIA. */ | |
12213 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12214 | /* Get Rn. */ | |
12215 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12216 | while (register_bits) | |
12217 | { | |
12218 | if (register_bits & 0x00000001) | |
f969241e | 12219 | record_buf[index++] = register_count; |
72508ac0 | 12220 | register_bits = register_bits >> 1; |
f969241e | 12221 | register_count++; |
72508ac0 | 12222 | } |
f969241e OJ |
12223 | record_buf[index++] = reg_src1; |
12224 | thumb_insn_r->reg_rec_count = index; | |
72508ac0 PO |
12225 | } |
12226 | else if (0 == opcode2) | |
12227 | { | |
12228 | /* It handles both STMIA. */ | |
12229 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12230 | /* Get Rn. */ | |
12231 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12232 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12233 | while (register_bits) | |
12234 | { | |
12235 | if (register_bits & 0x00000001) | |
12236 | register_count++; | |
12237 | register_bits = register_bits >> 1; | |
12238 | } | |
12239 | start_address = u_regval; | |
12240 | thumb_insn_r->mem_rec_count = register_count; | |
12241 | while (register_count) | |
12242 | { | |
12243 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12244 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12245 | start_address = start_address + 4; | |
12246 | register_count--; | |
12247 | } | |
12248 | } | |
12249 | else if (0x1F == opcode1) | |
12250 | { | |
12251 | /* Handle arm syscall insn. */ | |
97dfe206 | 12252 | if (tdep->arm_syscall_record != NULL) |
72508ac0 | 12253 | { |
97dfe206 OJ |
12254 | regcache_raw_read_unsigned (reg_cache, 7, &u_regval); |
12255 | ret = tdep->arm_syscall_record (reg_cache, u_regval); | |
72508ac0 PO |
12256 | } |
12257 | else | |
12258 | { | |
12259 | printf_unfiltered (_("no syscall record support\n")); | |
12260 | return -1; | |
12261 | } | |
12262 | } | |
12263 | ||
12264 | /* B (1), conditional branch is automatically taken care in process_record, | |
12265 | as PC is saved there. */ | |
12266 | ||
12267 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12268 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12269 | record_buf_mem); | |
12270 | ||
12271 | return ret; | |
12272 | } | |
12273 | ||
12274 | /* Handling opcode 111 insns. */ | |
12275 | ||
12276 | static int | |
12277 | thumb_record_branch (insn_decode_record *thumb_insn_r) | |
12278 | { | |
12279 | uint32_t record_buf[8]; | |
12280 | uint32_t bits_h = 0; | |
12281 | ||
12282 | bits_h = bits (thumb_insn_r->arm_insn, 11, 12); | |
12283 | ||
12284 | if (2 == bits_h || 3 == bits_h) | |
12285 | { | |
12286 | /* BL */ | |
12287 | record_buf[0] = ARM_LR_REGNUM; | |
12288 | thumb_insn_r->reg_rec_count = 1; | |
12289 | } | |
12290 | else if (1 == bits_h) | |
12291 | { | |
12292 | /* BLX(1). */ | |
12293 | record_buf[0] = ARM_PS_REGNUM; | |
12294 | record_buf[1] = ARM_LR_REGNUM; | |
12295 | thumb_insn_r->reg_rec_count = 2; | |
12296 | } | |
12297 | ||
12298 | /* B(2) is automatically taken care in process_record, as PC is | |
12299 | saved there. */ | |
12300 | ||
12301 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12302 | ||
12303 | return 0; | |
12304 | } | |
12305 | ||
c6ec2b30 OJ |
12306 | /* Handler for thumb2 load/store multiple instructions. */ |
12307 | ||
12308 | static int | |
12309 | thumb2_record_ld_st_multiple (insn_decode_record *thumb2_insn_r) | |
12310 | { | |
12311 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12312 | ||
12313 | uint32_t reg_rn, op; | |
12314 | uint32_t register_bits = 0, register_count = 0; | |
12315 | uint32_t index = 0, start_address = 0; | |
12316 | uint32_t record_buf[24], record_buf_mem[48]; | |
12317 | ||
12318 | ULONGEST u_regval = 0; | |
12319 | ||
12320 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12321 | op = bits (thumb2_insn_r->arm_insn, 23, 24); | |
12322 | ||
12323 | if (0 == op || 3 == op) | |
12324 | { | |
12325 | if (bit (thumb2_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
12326 | { | |
12327 | /* Handle RFE instruction. */ | |
12328 | record_buf[0] = ARM_PS_REGNUM; | |
12329 | thumb2_insn_r->reg_rec_count = 1; | |
12330 | } | |
12331 | else | |
12332 | { | |
12333 | /* Handle SRS instruction after reading banked SP. */ | |
12334 | return arm_record_unsupported_insn (thumb2_insn_r); | |
12335 | } | |
12336 | } | |
12337 | else if (1 == op || 2 == op) | |
12338 | { | |
12339 | if (bit (thumb2_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
12340 | { | |
12341 | /* Handle LDM/LDMIA/LDMFD and LDMDB/LDMEA instructions. */ | |
12342 | register_bits = bits (thumb2_insn_r->arm_insn, 0, 15); | |
12343 | while (register_bits) | |
12344 | { | |
12345 | if (register_bits & 0x00000001) | |
12346 | record_buf[index++] = register_count; | |
12347 | ||
12348 | register_count++; | |
12349 | register_bits = register_bits >> 1; | |
12350 | } | |
12351 | record_buf[index++] = reg_rn; | |
12352 | record_buf[index++] = ARM_PS_REGNUM; | |
12353 | thumb2_insn_r->reg_rec_count = index; | |
12354 | } | |
12355 | else | |
12356 | { | |
12357 | /* Handle STM/STMIA/STMEA and STMDB/STMFD. */ | |
12358 | register_bits = bits (thumb2_insn_r->arm_insn, 0, 15); | |
12359 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval); | |
12360 | while (register_bits) | |
12361 | { | |
12362 | if (register_bits & 0x00000001) | |
12363 | register_count++; | |
12364 | ||
12365 | register_bits = register_bits >> 1; | |
12366 | } | |
12367 | ||
12368 | if (1 == op) | |
12369 | { | |
12370 | /* Start address calculation for LDMDB/LDMEA. */ | |
12371 | start_address = u_regval; | |
12372 | } | |
12373 | else if (2 == op) | |
12374 | { | |
12375 | /* Start address calculation for LDMDB/LDMEA. */ | |
12376 | start_address = u_regval - register_count * 4; | |
12377 | } | |
12378 | ||
12379 | thumb2_insn_r->mem_rec_count = register_count; | |
12380 | while (register_count) | |
12381 | { | |
12382 | record_buf_mem[register_count * 2 - 1] = start_address; | |
12383 | record_buf_mem[register_count * 2 - 2] = 4; | |
12384 | start_address = start_address + 4; | |
12385 | register_count--; | |
12386 | } | |
12387 | record_buf[0] = reg_rn; | |
12388 | record_buf[1] = ARM_PS_REGNUM; | |
12389 | thumb2_insn_r->reg_rec_count = 2; | |
12390 | } | |
12391 | } | |
12392 | ||
12393 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12394 | record_buf_mem); | |
12395 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12396 | record_buf); | |
12397 | return ARM_RECORD_SUCCESS; | |
12398 | } | |
12399 | ||
12400 | /* Handler for thumb2 load/store (dual/exclusive) and table branch | |
12401 | instructions. */ | |
12402 | ||
12403 | static int | |
12404 | thumb2_record_ld_st_dual_ex_tbb (insn_decode_record *thumb2_insn_r) | |
12405 | { | |
12406 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12407 | ||
12408 | uint32_t reg_rd, reg_rn, offset_imm; | |
12409 | uint32_t reg_dest1, reg_dest2; | |
12410 | uint32_t address, offset_addr; | |
12411 | uint32_t record_buf[8], record_buf_mem[8]; | |
12412 | uint32_t op1, op2, op3; | |
c6ec2b30 OJ |
12413 | |
12414 | ULONGEST u_regval[2]; | |
12415 | ||
12416 | op1 = bits (thumb2_insn_r->arm_insn, 23, 24); | |
12417 | op2 = bits (thumb2_insn_r->arm_insn, 20, 21); | |
12418 | op3 = bits (thumb2_insn_r->arm_insn, 4, 7); | |
12419 | ||
12420 | if (bit (thumb2_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
12421 | { | |
12422 | if(!(1 == op1 && 1 == op2 && (0 == op3 || 1 == op3))) | |
12423 | { | |
12424 | reg_dest1 = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12425 | record_buf[0] = reg_dest1; | |
12426 | record_buf[1] = ARM_PS_REGNUM; | |
12427 | thumb2_insn_r->reg_rec_count = 2; | |
12428 | } | |
12429 | ||
12430 | if (3 == op2 || (op1 & 2) || (1 == op1 && 1 == op2 && 7 == op3)) | |
12431 | { | |
12432 | reg_dest2 = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12433 | record_buf[2] = reg_dest2; | |
12434 | thumb2_insn_r->reg_rec_count = 3; | |
12435 | } | |
12436 | } | |
12437 | else | |
12438 | { | |
12439 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12440 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval[0]); | |
12441 | ||
12442 | if (0 == op1 && 0 == op2) | |
12443 | { | |
12444 | /* Handle STREX. */ | |
12445 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 7); | |
12446 | address = u_regval[0] + (offset_imm * 4); | |
12447 | record_buf_mem[0] = 4; | |
12448 | record_buf_mem[1] = address; | |
12449 | thumb2_insn_r->mem_rec_count = 1; | |
12450 | reg_rd = bits (thumb2_insn_r->arm_insn, 0, 3); | |
12451 | record_buf[0] = reg_rd; | |
12452 | thumb2_insn_r->reg_rec_count = 1; | |
12453 | } | |
12454 | else if (1 == op1 && 0 == op2) | |
12455 | { | |
12456 | reg_rd = bits (thumb2_insn_r->arm_insn, 0, 3); | |
12457 | record_buf[0] = reg_rd; | |
12458 | thumb2_insn_r->reg_rec_count = 1; | |
12459 | address = u_regval[0]; | |
12460 | record_buf_mem[1] = address; | |
12461 | ||
12462 | if (4 == op3) | |
12463 | { | |
12464 | /* Handle STREXB. */ | |
12465 | record_buf_mem[0] = 1; | |
12466 | thumb2_insn_r->mem_rec_count = 1; | |
12467 | } | |
12468 | else if (5 == op3) | |
12469 | { | |
12470 | /* Handle STREXH. */ | |
12471 | record_buf_mem[0] = 2 ; | |
12472 | thumb2_insn_r->mem_rec_count = 1; | |
12473 | } | |
12474 | else if (7 == op3) | |
12475 | { | |
12476 | /* Handle STREXD. */ | |
12477 | address = u_regval[0]; | |
12478 | record_buf_mem[0] = 4; | |
12479 | record_buf_mem[2] = 4; | |
12480 | record_buf_mem[3] = address + 4; | |
12481 | thumb2_insn_r->mem_rec_count = 2; | |
12482 | } | |
12483 | } | |
12484 | else | |
12485 | { | |
12486 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 7); | |
12487 | ||
12488 | if (bit (thumb2_insn_r->arm_insn, 24)) | |
12489 | { | |
12490 | if (bit (thumb2_insn_r->arm_insn, 23)) | |
12491 | offset_addr = u_regval[0] + (offset_imm * 4); | |
12492 | else | |
12493 | offset_addr = u_regval[0] - (offset_imm * 4); | |
12494 | ||
12495 | address = offset_addr; | |
12496 | } | |
12497 | else | |
12498 | address = u_regval[0]; | |
12499 | ||
12500 | record_buf_mem[0] = 4; | |
12501 | record_buf_mem[1] = address; | |
12502 | record_buf_mem[2] = 4; | |
12503 | record_buf_mem[3] = address + 4; | |
12504 | thumb2_insn_r->mem_rec_count = 2; | |
12505 | record_buf[0] = reg_rn; | |
12506 | thumb2_insn_r->reg_rec_count = 1; | |
12507 | } | |
12508 | } | |
12509 | ||
12510 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12511 | record_buf); | |
12512 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12513 | record_buf_mem); | |
12514 | return ARM_RECORD_SUCCESS; | |
12515 | } | |
12516 | ||
12517 | /* Handler for thumb2 data processing (shift register and modified immediate) | |
12518 | instructions. */ | |
12519 | ||
12520 | static int | |
12521 | thumb2_record_data_proc_sreg_mimm (insn_decode_record *thumb2_insn_r) | |
12522 | { | |
12523 | uint32_t reg_rd, op; | |
12524 | uint32_t record_buf[8]; | |
12525 | ||
12526 | op = bits (thumb2_insn_r->arm_insn, 21, 24); | |
12527 | reg_rd = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12528 | ||
12529 | if ((0 == op || 4 == op || 8 == op || 13 == op) && 15 == reg_rd) | |
12530 | { | |
12531 | record_buf[0] = ARM_PS_REGNUM; | |
12532 | thumb2_insn_r->reg_rec_count = 1; | |
12533 | } | |
12534 | else | |
12535 | { | |
12536 | record_buf[0] = reg_rd; | |
12537 | record_buf[1] = ARM_PS_REGNUM; | |
12538 | thumb2_insn_r->reg_rec_count = 2; | |
12539 | } | |
12540 | ||
12541 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12542 | record_buf); | |
12543 | return ARM_RECORD_SUCCESS; | |
12544 | } | |
12545 | ||
12546 | /* Generic handler for thumb2 instructions which effect destination and PS | |
12547 | registers. */ | |
12548 | ||
12549 | static int | |
12550 | thumb2_record_ps_dest_generic (insn_decode_record *thumb2_insn_r) | |
12551 | { | |
12552 | uint32_t reg_rd; | |
12553 | uint32_t record_buf[8]; | |
12554 | ||
12555 | reg_rd = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12556 | ||
12557 | record_buf[0] = reg_rd; | |
12558 | record_buf[1] = ARM_PS_REGNUM; | |
12559 | thumb2_insn_r->reg_rec_count = 2; | |
12560 | ||
12561 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12562 | record_buf); | |
12563 | return ARM_RECORD_SUCCESS; | |
12564 | } | |
12565 | ||
12566 | /* Handler for thumb2 branch and miscellaneous control instructions. */ | |
12567 | ||
12568 | static int | |
12569 | thumb2_record_branch_misc_cntrl (insn_decode_record *thumb2_insn_r) | |
12570 | { | |
12571 | uint32_t op, op1, op2; | |
12572 | uint32_t record_buf[8]; | |
12573 | ||
12574 | op = bits (thumb2_insn_r->arm_insn, 20, 26); | |
12575 | op1 = bits (thumb2_insn_r->arm_insn, 12, 14); | |
12576 | op2 = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12577 | ||
12578 | /* Handle MSR insn. */ | |
12579 | if (!(op1 & 0x2) && 0x38 == op) | |
12580 | { | |
12581 | if (!(op2 & 0x3)) | |
12582 | { | |
12583 | /* CPSR is going to be changed. */ | |
12584 | record_buf[0] = ARM_PS_REGNUM; | |
12585 | thumb2_insn_r->reg_rec_count = 1; | |
12586 | } | |
12587 | else | |
12588 | { | |
12589 | arm_record_unsupported_insn(thumb2_insn_r); | |
12590 | return -1; | |
12591 | } | |
12592 | } | |
12593 | else if (4 == (op1 & 0x5) || 5 == (op1 & 0x5)) | |
12594 | { | |
12595 | /* BLX. */ | |
12596 | record_buf[0] = ARM_PS_REGNUM; | |
12597 | record_buf[1] = ARM_LR_REGNUM; | |
12598 | thumb2_insn_r->reg_rec_count = 2; | |
12599 | } | |
12600 | ||
12601 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12602 | record_buf); | |
12603 | return ARM_RECORD_SUCCESS; | |
12604 | } | |
12605 | ||
12606 | /* Handler for thumb2 store single data item instructions. */ | |
12607 | ||
12608 | static int | |
12609 | thumb2_record_str_single_data (insn_decode_record *thumb2_insn_r) | |
12610 | { | |
12611 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12612 | ||
12613 | uint32_t reg_rn, reg_rm, offset_imm, shift_imm; | |
12614 | uint32_t address, offset_addr; | |
12615 | uint32_t record_buf[8], record_buf_mem[8]; | |
12616 | uint32_t op1, op2; | |
12617 | ||
12618 | ULONGEST u_regval[2]; | |
12619 | ||
12620 | op1 = bits (thumb2_insn_r->arm_insn, 21, 23); | |
12621 | op2 = bits (thumb2_insn_r->arm_insn, 6, 11); | |
12622 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12623 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval[0]); | |
12624 | ||
12625 | if (bit (thumb2_insn_r->arm_insn, 23)) | |
12626 | { | |
12627 | /* T2 encoding. */ | |
12628 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 11); | |
12629 | offset_addr = u_regval[0] + offset_imm; | |
12630 | address = offset_addr; | |
12631 | } | |
12632 | else | |
12633 | { | |
12634 | /* T3 encoding. */ | |
12635 | if ((0 == op1 || 1 == op1 || 2 == op1) && !(op2 & 0x20)) | |
12636 | { | |
12637 | /* Handle STRB (register). */ | |
12638 | reg_rm = bits (thumb2_insn_r->arm_insn, 0, 3); | |
12639 | regcache_raw_read_unsigned (reg_cache, reg_rm, &u_regval[1]); | |
12640 | shift_imm = bits (thumb2_insn_r->arm_insn, 4, 5); | |
12641 | offset_addr = u_regval[1] << shift_imm; | |
12642 | address = u_regval[0] + offset_addr; | |
12643 | } | |
12644 | else | |
12645 | { | |
12646 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 7); | |
12647 | if (bit (thumb2_insn_r->arm_insn, 10)) | |
12648 | { | |
12649 | if (bit (thumb2_insn_r->arm_insn, 9)) | |
12650 | offset_addr = u_regval[0] + offset_imm; | |
12651 | else | |
12652 | offset_addr = u_regval[0] - offset_imm; | |
12653 | ||
12654 | address = offset_addr; | |
12655 | } | |
12656 | else | |
12657 | address = u_regval[0]; | |
12658 | } | |
12659 | } | |
12660 | ||
12661 | switch (op1) | |
12662 | { | |
12663 | /* Store byte instructions. */ | |
12664 | case 4: | |
12665 | case 0: | |
12666 | record_buf_mem[0] = 1; | |
12667 | break; | |
12668 | /* Store half word instructions. */ | |
12669 | case 1: | |
12670 | case 5: | |
12671 | record_buf_mem[0] = 2; | |
12672 | break; | |
12673 | /* Store word instructions. */ | |
12674 | case 2: | |
12675 | case 6: | |
12676 | record_buf_mem[0] = 4; | |
12677 | break; | |
12678 | ||
12679 | default: | |
12680 | gdb_assert_not_reached ("no decoding pattern found"); | |
12681 | break; | |
12682 | } | |
12683 | ||
12684 | record_buf_mem[1] = address; | |
12685 | thumb2_insn_r->mem_rec_count = 1; | |
12686 | record_buf[0] = reg_rn; | |
12687 | thumb2_insn_r->reg_rec_count = 1; | |
12688 | ||
12689 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12690 | record_buf); | |
12691 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12692 | record_buf_mem); | |
12693 | return ARM_RECORD_SUCCESS; | |
12694 | } | |
12695 | ||
12696 | /* Handler for thumb2 load memory hints instructions. */ | |
12697 | ||
12698 | static int | |
12699 | thumb2_record_ld_mem_hints (insn_decode_record *thumb2_insn_r) | |
12700 | { | |
12701 | uint32_t record_buf[8]; | |
12702 | uint32_t reg_rt, reg_rn; | |
12703 | ||
12704 | reg_rt = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12705 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12706 | ||
12707 | if (ARM_PC_REGNUM != reg_rt) | |
12708 | { | |
12709 | record_buf[0] = reg_rt; | |
12710 | record_buf[1] = reg_rn; | |
12711 | record_buf[2] = ARM_PS_REGNUM; | |
12712 | thumb2_insn_r->reg_rec_count = 3; | |
12713 | ||
12714 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12715 | record_buf); | |
12716 | return ARM_RECORD_SUCCESS; | |
12717 | } | |
12718 | ||
12719 | return ARM_RECORD_FAILURE; | |
12720 | } | |
12721 | ||
12722 | /* Handler for thumb2 load word instructions. */ | |
12723 | ||
12724 | static int | |
12725 | thumb2_record_ld_word (insn_decode_record *thumb2_insn_r) | |
12726 | { | |
c6ec2b30 OJ |
12727 | uint32_t record_buf[8]; |
12728 | ||
12729 | record_buf[0] = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12730 | record_buf[1] = ARM_PS_REGNUM; | |
12731 | thumb2_insn_r->reg_rec_count = 2; | |
12732 | ||
12733 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12734 | record_buf); | |
12735 | return ARM_RECORD_SUCCESS; | |
12736 | } | |
12737 | ||
12738 | /* Handler for thumb2 long multiply, long multiply accumulate, and | |
12739 | divide instructions. */ | |
12740 | ||
12741 | static int | |
12742 | thumb2_record_lmul_lmla_div (insn_decode_record *thumb2_insn_r) | |
12743 | { | |
12744 | uint32_t opcode1 = 0, opcode2 = 0; | |
12745 | uint32_t record_buf[8]; | |
c6ec2b30 OJ |
12746 | |
12747 | opcode1 = bits (thumb2_insn_r->arm_insn, 20, 22); | |
12748 | opcode2 = bits (thumb2_insn_r->arm_insn, 4, 7); | |
12749 | ||
12750 | if (0 == opcode1 || 2 == opcode1 || (opcode1 >= 4 && opcode1 <= 6)) | |
12751 | { | |
12752 | /* Handle SMULL, UMULL, SMULAL. */ | |
12753 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ | |
12754 | record_buf[0] = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12755 | record_buf[1] = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12756 | record_buf[2] = ARM_PS_REGNUM; | |
12757 | thumb2_insn_r->reg_rec_count = 3; | |
12758 | } | |
12759 | else if (1 == opcode1 || 3 == opcode2) | |
12760 | { | |
12761 | /* Handle SDIV and UDIV. */ | |
12762 | record_buf[0] = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12763 | record_buf[1] = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12764 | record_buf[2] = ARM_PS_REGNUM; | |
12765 | thumb2_insn_r->reg_rec_count = 3; | |
12766 | } | |
12767 | else | |
12768 | return ARM_RECORD_FAILURE; | |
12769 | ||
12770 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12771 | record_buf); | |
12772 | return ARM_RECORD_SUCCESS; | |
12773 | } | |
12774 | ||
60cc5e93 OJ |
12775 | /* Record handler for thumb32 coprocessor instructions. */ |
12776 | ||
12777 | static int | |
12778 | thumb2_record_coproc_insn (insn_decode_record *thumb2_insn_r) | |
12779 | { | |
12780 | if (bit (thumb2_insn_r->arm_insn, 25)) | |
12781 | return arm_record_coproc_data_proc (thumb2_insn_r); | |
12782 | else | |
12783 | return arm_record_asimd_vfp_coproc (thumb2_insn_r); | |
12784 | } | |
12785 | ||
1e1b6563 OJ |
12786 | /* Record handler for advance SIMD structure load/store instructions. */ |
12787 | ||
12788 | static int | |
12789 | thumb2_record_asimd_struct_ld_st (insn_decode_record *thumb2_insn_r) | |
12790 | { | |
12791 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12792 | uint32_t l_bit, a_bit, b_bits; | |
12793 | uint32_t record_buf[128], record_buf_mem[128]; | |
bec2ab5a | 12794 | uint32_t reg_rn, reg_vd, address, f_elem; |
1e1b6563 OJ |
12795 | uint32_t index_r = 0, index_e = 0, bf_regs = 0, index_m = 0, loop_t = 0; |
12796 | uint8_t f_ebytes; | |
12797 | ||
12798 | l_bit = bit (thumb2_insn_r->arm_insn, 21); | |
12799 | a_bit = bit (thumb2_insn_r->arm_insn, 23); | |
12800 | b_bits = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12801 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12802 | reg_vd = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12803 | reg_vd = (bit (thumb2_insn_r->arm_insn, 22) << 4) | reg_vd; | |
12804 | f_ebytes = (1 << bits (thumb2_insn_r->arm_insn, 6, 7)); | |
1e1b6563 OJ |
12805 | f_elem = 8 / f_ebytes; |
12806 | ||
12807 | if (!l_bit) | |
12808 | { | |
12809 | ULONGEST u_regval = 0; | |
12810 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval); | |
12811 | address = u_regval; | |
12812 | ||
12813 | if (!a_bit) | |
12814 | { | |
12815 | /* Handle VST1. */ | |
12816 | if (b_bits == 0x02 || b_bits == 0x0a || (b_bits & 0x0e) == 0x06) | |
12817 | { | |
12818 | if (b_bits == 0x07) | |
12819 | bf_regs = 1; | |
12820 | else if (b_bits == 0x0a) | |
12821 | bf_regs = 2; | |
12822 | else if (b_bits == 0x06) | |
12823 | bf_regs = 3; | |
12824 | else if (b_bits == 0x02) | |
12825 | bf_regs = 4; | |
12826 | else | |
12827 | bf_regs = 0; | |
12828 | ||
12829 | for (index_r = 0; index_r < bf_regs; index_r++) | |
12830 | { | |
12831 | for (index_e = 0; index_e < f_elem; index_e++) | |
12832 | { | |
12833 | record_buf_mem[index_m++] = f_ebytes; | |
12834 | record_buf_mem[index_m++] = address; | |
12835 | address = address + f_ebytes; | |
12836 | thumb2_insn_r->mem_rec_count += 1; | |
12837 | } | |
12838 | } | |
12839 | } | |
12840 | /* Handle VST2. */ | |
12841 | else if (b_bits == 0x03 || (b_bits & 0x0e) == 0x08) | |
12842 | { | |
12843 | if (b_bits == 0x09 || b_bits == 0x08) | |
12844 | bf_regs = 1; | |
12845 | else if (b_bits == 0x03) | |
12846 | bf_regs = 2; | |
12847 | else | |
12848 | bf_regs = 0; | |
12849 | ||
12850 | for (index_r = 0; index_r < bf_regs; index_r++) | |
12851 | for (index_e = 0; index_e < f_elem; index_e++) | |
12852 | { | |
12853 | for (loop_t = 0; loop_t < 2; loop_t++) | |
12854 | { | |
12855 | record_buf_mem[index_m++] = f_ebytes; | |
12856 | record_buf_mem[index_m++] = address + (loop_t * f_ebytes); | |
12857 | thumb2_insn_r->mem_rec_count += 1; | |
12858 | } | |
12859 | address = address + (2 * f_ebytes); | |
12860 | } | |
12861 | } | |
12862 | /* Handle VST3. */ | |
12863 | else if ((b_bits & 0x0e) == 0x04) | |
12864 | { | |
12865 | for (index_e = 0; index_e < f_elem; index_e++) | |
12866 | { | |
12867 | for (loop_t = 0; loop_t < 3; loop_t++) | |
12868 | { | |
12869 | record_buf_mem[index_m++] = f_ebytes; | |
12870 | record_buf_mem[index_m++] = address + (loop_t * f_ebytes); | |
12871 | thumb2_insn_r->mem_rec_count += 1; | |
12872 | } | |
12873 | address = address + (3 * f_ebytes); | |
12874 | } | |
12875 | } | |
12876 | /* Handle VST4. */ | |
12877 | else if (!(b_bits & 0x0e)) | |
12878 | { | |
12879 | for (index_e = 0; index_e < f_elem; index_e++) | |
12880 | { | |
12881 | for (loop_t = 0; loop_t < 4; loop_t++) | |
12882 | { | |
12883 | record_buf_mem[index_m++] = f_ebytes; | |
12884 | record_buf_mem[index_m++] = address + (loop_t * f_ebytes); | |
12885 | thumb2_insn_r->mem_rec_count += 1; | |
12886 | } | |
12887 | address = address + (4 * f_ebytes); | |
12888 | } | |
12889 | } | |
12890 | } | |
12891 | else | |
12892 | { | |
12893 | uint8_t bft_size = bits (thumb2_insn_r->arm_insn, 10, 11); | |
12894 | ||
12895 | if (bft_size == 0x00) | |
12896 | f_ebytes = 1; | |
12897 | else if (bft_size == 0x01) | |
12898 | f_ebytes = 2; | |
12899 | else if (bft_size == 0x02) | |
12900 | f_ebytes = 4; | |
12901 | else | |
12902 | f_ebytes = 0; | |
12903 | ||
12904 | /* Handle VST1. */ | |
12905 | if (!(b_bits & 0x0b) || b_bits == 0x08) | |
12906 | thumb2_insn_r->mem_rec_count = 1; | |
12907 | /* Handle VST2. */ | |
12908 | else if ((b_bits & 0x0b) == 0x01 || b_bits == 0x09) | |
12909 | thumb2_insn_r->mem_rec_count = 2; | |
12910 | /* Handle VST3. */ | |
12911 | else if ((b_bits & 0x0b) == 0x02 || b_bits == 0x0a) | |
12912 | thumb2_insn_r->mem_rec_count = 3; | |
12913 | /* Handle VST4. */ | |
12914 | else if ((b_bits & 0x0b) == 0x03 || b_bits == 0x0b) | |
12915 | thumb2_insn_r->mem_rec_count = 4; | |
12916 | ||
12917 | for (index_m = 0; index_m < thumb2_insn_r->mem_rec_count; index_m++) | |
12918 | { | |
12919 | record_buf_mem[index_m] = f_ebytes; | |
12920 | record_buf_mem[index_m] = address + (index_m * f_ebytes); | |
12921 | } | |
12922 | } | |
12923 | } | |
12924 | else | |
12925 | { | |
12926 | if (!a_bit) | |
12927 | { | |
12928 | /* Handle VLD1. */ | |
12929 | if (b_bits == 0x02 || b_bits == 0x0a || (b_bits & 0x0e) == 0x06) | |
12930 | thumb2_insn_r->reg_rec_count = 1; | |
12931 | /* Handle VLD2. */ | |
12932 | else if (b_bits == 0x03 || (b_bits & 0x0e) == 0x08) | |
12933 | thumb2_insn_r->reg_rec_count = 2; | |
12934 | /* Handle VLD3. */ | |
12935 | else if ((b_bits & 0x0e) == 0x04) | |
12936 | thumb2_insn_r->reg_rec_count = 3; | |
12937 | /* Handle VLD4. */ | |
12938 | else if (!(b_bits & 0x0e)) | |
12939 | thumb2_insn_r->reg_rec_count = 4; | |
12940 | } | |
12941 | else | |
12942 | { | |
12943 | /* Handle VLD1. */ | |
12944 | if (!(b_bits & 0x0b) || b_bits == 0x08 || b_bits == 0x0c) | |
12945 | thumb2_insn_r->reg_rec_count = 1; | |
12946 | /* Handle VLD2. */ | |
12947 | else if ((b_bits & 0x0b) == 0x01 || b_bits == 0x09 || b_bits == 0x0d) | |
12948 | thumb2_insn_r->reg_rec_count = 2; | |
12949 | /* Handle VLD3. */ | |
12950 | else if ((b_bits & 0x0b) == 0x02 || b_bits == 0x0a || b_bits == 0x0e) | |
12951 | thumb2_insn_r->reg_rec_count = 3; | |
12952 | /* Handle VLD4. */ | |
12953 | else if ((b_bits & 0x0b) == 0x03 || b_bits == 0x0b || b_bits == 0x0f) | |
12954 | thumb2_insn_r->reg_rec_count = 4; | |
12955 | ||
12956 | for (index_r = 0; index_r < thumb2_insn_r->reg_rec_count; index_r++) | |
12957 | record_buf[index_r] = reg_vd + ARM_D0_REGNUM + index_r; | |
12958 | } | |
12959 | } | |
12960 | ||
12961 | if (bits (thumb2_insn_r->arm_insn, 0, 3) != 15) | |
12962 | { | |
12963 | record_buf[index_r] = reg_rn; | |
12964 | thumb2_insn_r->reg_rec_count += 1; | |
12965 | } | |
12966 | ||
12967 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12968 | record_buf); | |
12969 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12970 | record_buf_mem); | |
12971 | return 0; | |
12972 | } | |
12973 | ||
c6ec2b30 OJ |
12974 | /* Decodes thumb2 instruction type and invokes its record handler. */ |
12975 | ||
12976 | static unsigned int | |
12977 | thumb2_record_decode_insn_handler (insn_decode_record *thumb2_insn_r) | |
12978 | { | |
12979 | uint32_t op, op1, op2; | |
12980 | ||
12981 | op = bit (thumb2_insn_r->arm_insn, 15); | |
12982 | op1 = bits (thumb2_insn_r->arm_insn, 27, 28); | |
12983 | op2 = bits (thumb2_insn_r->arm_insn, 20, 26); | |
12984 | ||
12985 | if (op1 == 0x01) | |
12986 | { | |
12987 | if (!(op2 & 0x64 )) | |
12988 | { | |
12989 | /* Load/store multiple instruction. */ | |
12990 | return thumb2_record_ld_st_multiple (thumb2_insn_r); | |
12991 | } | |
b121eeb9 | 12992 | else if ((op2 & 0x64) == 0x4) |
c6ec2b30 OJ |
12993 | { |
12994 | /* Load/store (dual/exclusive) and table branch instruction. */ | |
12995 | return thumb2_record_ld_st_dual_ex_tbb (thumb2_insn_r); | |
12996 | } | |
b121eeb9 | 12997 | else if ((op2 & 0x60) == 0x20) |
c6ec2b30 OJ |
12998 | { |
12999 | /* Data-processing (shifted register). */ | |
13000 | return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r); | |
13001 | } | |
13002 | else if (op2 & 0x40) | |
13003 | { | |
13004 | /* Co-processor instructions. */ | |
60cc5e93 | 13005 | return thumb2_record_coproc_insn (thumb2_insn_r); |
c6ec2b30 OJ |
13006 | } |
13007 | } | |
13008 | else if (op1 == 0x02) | |
13009 | { | |
13010 | if (op) | |
13011 | { | |
13012 | /* Branches and miscellaneous control instructions. */ | |
13013 | return thumb2_record_branch_misc_cntrl (thumb2_insn_r); | |
13014 | } | |
13015 | else if (op2 & 0x20) | |
13016 | { | |
13017 | /* Data-processing (plain binary immediate) instruction. */ | |
13018 | return thumb2_record_ps_dest_generic (thumb2_insn_r); | |
13019 | } | |
13020 | else | |
13021 | { | |
13022 | /* Data-processing (modified immediate). */ | |
13023 | return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r); | |
13024 | } | |
13025 | } | |
13026 | else if (op1 == 0x03) | |
13027 | { | |
13028 | if (!(op2 & 0x71 )) | |
13029 | { | |
13030 | /* Store single data item. */ | |
13031 | return thumb2_record_str_single_data (thumb2_insn_r); | |
13032 | } | |
13033 | else if (!((op2 & 0x71) ^ 0x10)) | |
13034 | { | |
13035 | /* Advanced SIMD or structure load/store instructions. */ | |
1e1b6563 | 13036 | return thumb2_record_asimd_struct_ld_st (thumb2_insn_r); |
c6ec2b30 OJ |
13037 | } |
13038 | else if (!((op2 & 0x67) ^ 0x01)) | |
13039 | { | |
13040 | /* Load byte, memory hints instruction. */ | |
13041 | return thumb2_record_ld_mem_hints (thumb2_insn_r); | |
13042 | } | |
13043 | else if (!((op2 & 0x67) ^ 0x03)) | |
13044 | { | |
13045 | /* Load halfword, memory hints instruction. */ | |
13046 | return thumb2_record_ld_mem_hints (thumb2_insn_r); | |
13047 | } | |
13048 | else if (!((op2 & 0x67) ^ 0x05)) | |
13049 | { | |
13050 | /* Load word instruction. */ | |
13051 | return thumb2_record_ld_word (thumb2_insn_r); | |
13052 | } | |
13053 | else if (!((op2 & 0x70) ^ 0x20)) | |
13054 | { | |
13055 | /* Data-processing (register) instruction. */ | |
13056 | return thumb2_record_ps_dest_generic (thumb2_insn_r); | |
13057 | } | |
13058 | else if (!((op2 & 0x78) ^ 0x30)) | |
13059 | { | |
13060 | /* Multiply, multiply accumulate, abs diff instruction. */ | |
13061 | return thumb2_record_ps_dest_generic (thumb2_insn_r); | |
13062 | } | |
13063 | else if (!((op2 & 0x78) ^ 0x38)) | |
13064 | { | |
13065 | /* Long multiply, long multiply accumulate, and divide. */ | |
13066 | return thumb2_record_lmul_lmla_div (thumb2_insn_r); | |
13067 | } | |
13068 | else if (op2 & 0x40) | |
13069 | { | |
13070 | /* Co-processor instructions. */ | |
60cc5e93 | 13071 | return thumb2_record_coproc_insn (thumb2_insn_r); |
c6ec2b30 OJ |
13072 | } |
13073 | } | |
13074 | ||
13075 | return -1; | |
13076 | } | |
72508ac0 | 13077 | |
ffdbe864 | 13078 | namespace { |
728a7913 YQ |
13079 | /* Abstract memory reader. */ |
13080 | ||
13081 | class abstract_memory_reader | |
13082 | { | |
13083 | public: | |
13084 | /* Read LEN bytes of target memory at address MEMADDR, placing the | |
13085 | results in GDB's memory at BUF. Return true on success. */ | |
13086 | ||
13087 | virtual bool read (CORE_ADDR memaddr, gdb_byte *buf, const size_t len) = 0; | |
13088 | }; | |
13089 | ||
13090 | /* Instruction reader from real target. */ | |
13091 | ||
13092 | class instruction_reader : public abstract_memory_reader | |
13093 | { | |
13094 | public: | |
632e107b | 13095 | bool read (CORE_ADDR memaddr, gdb_byte *buf, const size_t len) override |
728a7913 YQ |
13096 | { |
13097 | if (target_read_memory (memaddr, buf, len)) | |
13098 | return false; | |
13099 | else | |
13100 | return true; | |
13101 | } | |
13102 | }; | |
13103 | ||
ffdbe864 YQ |
13104 | } // namespace |
13105 | ||
72508ac0 | 13106 | /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success |
85102364 | 13107 | and positive val on failure. */ |
72508ac0 PO |
13108 | |
13109 | static int | |
728a7913 YQ |
13110 | extract_arm_insn (abstract_memory_reader& reader, |
13111 | insn_decode_record *insn_record, uint32_t insn_size) | |
72508ac0 PO |
13112 | { |
13113 | gdb_byte buf[insn_size]; | |
13114 | ||
13115 | memset (&buf[0], 0, insn_size); | |
13116 | ||
728a7913 | 13117 | if (!reader.read (insn_record->this_addr, buf, insn_size)) |
72508ac0 PO |
13118 | return 1; |
13119 | insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0], | |
13120 | insn_size, | |
2959fed9 | 13121 | gdbarch_byte_order_for_code (insn_record->gdbarch)); |
72508ac0 PO |
13122 | return 0; |
13123 | } | |
13124 | ||
13125 | typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*); | |
13126 | ||
13127 | /* Decode arm/thumb insn depending on condition cods and opcodes; and | |
13128 | dispatch it. */ | |
13129 | ||
13130 | static int | |
728a7913 YQ |
13131 | decode_insn (abstract_memory_reader &reader, insn_decode_record *arm_record, |
13132 | record_type_t record_type, uint32_t insn_size) | |
72508ac0 PO |
13133 | { |
13134 | ||
01e57735 YQ |
13135 | /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm |
13136 | instruction. */ | |
0fa9c223 | 13137 | static const sti_arm_hdl_fp_t arm_handle_insn[8] = |
72508ac0 PO |
13138 | { |
13139 | arm_record_data_proc_misc_ld_str, /* 000. */ | |
13140 | arm_record_data_proc_imm, /* 001. */ | |
13141 | arm_record_ld_st_imm_offset, /* 010. */ | |
13142 | arm_record_ld_st_reg_offset, /* 011. */ | |
13143 | arm_record_ld_st_multiple, /* 100. */ | |
13144 | arm_record_b_bl, /* 101. */ | |
60cc5e93 | 13145 | arm_record_asimd_vfp_coproc, /* 110. */ |
72508ac0 PO |
13146 | arm_record_coproc_data_proc /* 111. */ |
13147 | }; | |
13148 | ||
01e57735 YQ |
13149 | /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb |
13150 | instruction. */ | |
0fa9c223 | 13151 | static const sti_arm_hdl_fp_t thumb_handle_insn[8] = |
72508ac0 PO |
13152 | { \ |
13153 | thumb_record_shift_add_sub, /* 000. */ | |
13154 | thumb_record_add_sub_cmp_mov, /* 001. */ | |
13155 | thumb_record_ld_st_reg_offset, /* 010. */ | |
13156 | thumb_record_ld_st_imm_offset, /* 011. */ | |
13157 | thumb_record_ld_st_stack, /* 100. */ | |
13158 | thumb_record_misc, /* 101. */ | |
13159 | thumb_record_ldm_stm_swi, /* 110. */ | |
13160 | thumb_record_branch /* 111. */ | |
13161 | }; | |
13162 | ||
13163 | uint32_t ret = 0; /* return value: negative:failure 0:success. */ | |
13164 | uint32_t insn_id = 0; | |
13165 | ||
728a7913 | 13166 | if (extract_arm_insn (reader, arm_record, insn_size)) |
72508ac0 PO |
13167 | { |
13168 | if (record_debug) | |
01e57735 YQ |
13169 | { |
13170 | printf_unfiltered (_("Process record: error reading memory at " | |
13171 | "addr %s len = %d.\n"), | |
13172 | paddress (arm_record->gdbarch, | |
13173 | arm_record->this_addr), insn_size); | |
13174 | } | |
72508ac0 PO |
13175 | return -1; |
13176 | } | |
13177 | else if (ARM_RECORD == record_type) | |
13178 | { | |
13179 | arm_record->cond = bits (arm_record->arm_insn, 28, 31); | |
13180 | insn_id = bits (arm_record->arm_insn, 25, 27); | |
ca92db2d YQ |
13181 | |
13182 | if (arm_record->cond == 0xf) | |
13183 | ret = arm_record_extension_space (arm_record); | |
13184 | else | |
01e57735 | 13185 | { |
ca92db2d YQ |
13186 | /* If this insn has fallen into extension space |
13187 | then we need not decode it anymore. */ | |
01e57735 YQ |
13188 | ret = arm_handle_insn[insn_id] (arm_record); |
13189 | } | |
ca92db2d YQ |
13190 | if (ret != ARM_RECORD_SUCCESS) |
13191 | { | |
13192 | arm_record_unsupported_insn (arm_record); | |
13193 | ret = -1; | |
13194 | } | |
72508ac0 PO |
13195 | } |
13196 | else if (THUMB_RECORD == record_type) | |
13197 | { | |
13198 | /* As thumb does not have condition codes, we set negative. */ | |
13199 | arm_record->cond = -1; | |
13200 | insn_id = bits (arm_record->arm_insn, 13, 15); | |
13201 | ret = thumb_handle_insn[insn_id] (arm_record); | |
ca92db2d YQ |
13202 | if (ret != ARM_RECORD_SUCCESS) |
13203 | { | |
13204 | arm_record_unsupported_insn (arm_record); | |
13205 | ret = -1; | |
13206 | } | |
72508ac0 PO |
13207 | } |
13208 | else if (THUMB2_RECORD == record_type) | |
13209 | { | |
c6ec2b30 OJ |
13210 | /* As thumb does not have condition codes, we set negative. */ |
13211 | arm_record->cond = -1; | |
13212 | ||
13213 | /* Swap first half of 32bit thumb instruction with second half. */ | |
13214 | arm_record->arm_insn | |
01e57735 | 13215 | = (arm_record->arm_insn >> 16) | (arm_record->arm_insn << 16); |
c6ec2b30 | 13216 | |
ca92db2d | 13217 | ret = thumb2_record_decode_insn_handler (arm_record); |
c6ec2b30 | 13218 | |
ca92db2d | 13219 | if (ret != ARM_RECORD_SUCCESS) |
01e57735 YQ |
13220 | { |
13221 | arm_record_unsupported_insn (arm_record); | |
13222 | ret = -1; | |
13223 | } | |
72508ac0 PO |
13224 | } |
13225 | else | |
13226 | { | |
13227 | /* Throw assertion. */ | |
13228 | gdb_assert_not_reached ("not a valid instruction, could not decode"); | |
13229 | } | |
13230 | ||
13231 | return ret; | |
13232 | } | |
13233 | ||
b121eeb9 YQ |
13234 | #if GDB_SELF_TEST |
13235 | namespace selftests { | |
13236 | ||
13237 | /* Provide both 16-bit and 32-bit thumb instructions. */ | |
13238 | ||
13239 | class instruction_reader_thumb : public abstract_memory_reader | |
13240 | { | |
13241 | public: | |
13242 | template<size_t SIZE> | |
13243 | instruction_reader_thumb (enum bfd_endian endian, | |
13244 | const uint16_t (&insns)[SIZE]) | |
13245 | : m_endian (endian), m_insns (insns), m_insns_size (SIZE) | |
13246 | {} | |
13247 | ||
632e107b | 13248 | bool read (CORE_ADDR memaddr, gdb_byte *buf, const size_t len) override |
b121eeb9 YQ |
13249 | { |
13250 | SELF_CHECK (len == 4 || len == 2); | |
13251 | SELF_CHECK (memaddr % 2 == 0); | |
13252 | SELF_CHECK ((memaddr / 2) < m_insns_size); | |
13253 | ||
13254 | store_unsigned_integer (buf, 2, m_endian, m_insns[memaddr / 2]); | |
13255 | if (len == 4) | |
13256 | { | |
13257 | store_unsigned_integer (&buf[2], 2, m_endian, | |
13258 | m_insns[memaddr / 2 + 1]); | |
13259 | } | |
13260 | return true; | |
13261 | } | |
13262 | ||
13263 | private: | |
13264 | enum bfd_endian m_endian; | |
13265 | const uint16_t *m_insns; | |
13266 | size_t m_insns_size; | |
13267 | }; | |
13268 | ||
13269 | static void | |
13270 | arm_record_test (void) | |
13271 | { | |
13272 | struct gdbarch_info info; | |
13273 | gdbarch_info_init (&info); | |
13274 | info.bfd_arch_info = bfd_scan_arch ("arm"); | |
13275 | ||
13276 | struct gdbarch *gdbarch = gdbarch_find_by_info (info); | |
13277 | ||
13278 | SELF_CHECK (gdbarch != NULL); | |
13279 | ||
13280 | /* 16-bit Thumb instructions. */ | |
13281 | { | |
13282 | insn_decode_record arm_record; | |
13283 | ||
13284 | memset (&arm_record, 0, sizeof (insn_decode_record)); | |
13285 | arm_record.gdbarch = gdbarch; | |
13286 | ||
13287 | static const uint16_t insns[] = { | |
13288 | /* db b2 uxtb r3, r3 */ | |
13289 | 0xb2db, | |
13290 | /* cd 58 ldr r5, [r1, r3] */ | |
13291 | 0x58cd, | |
13292 | }; | |
13293 | ||
13294 | enum bfd_endian endian = gdbarch_byte_order_for_code (arm_record.gdbarch); | |
13295 | instruction_reader_thumb reader (endian, insns); | |
13296 | int ret = decode_insn (reader, &arm_record, THUMB_RECORD, | |
13297 | THUMB_INSN_SIZE_BYTES); | |
13298 | ||
13299 | SELF_CHECK (ret == 0); | |
13300 | SELF_CHECK (arm_record.mem_rec_count == 0); | |
13301 | SELF_CHECK (arm_record.reg_rec_count == 1); | |
13302 | SELF_CHECK (arm_record.arm_regs[0] == 3); | |
13303 | ||
13304 | arm_record.this_addr += 2; | |
13305 | ret = decode_insn (reader, &arm_record, THUMB_RECORD, | |
13306 | THUMB_INSN_SIZE_BYTES); | |
13307 | ||
13308 | SELF_CHECK (ret == 0); | |
13309 | SELF_CHECK (arm_record.mem_rec_count == 0); | |
13310 | SELF_CHECK (arm_record.reg_rec_count == 1); | |
13311 | SELF_CHECK (arm_record.arm_regs[0] == 5); | |
13312 | } | |
13313 | ||
13314 | /* 32-bit Thumb-2 instructions. */ | |
13315 | { | |
13316 | insn_decode_record arm_record; | |
13317 | ||
13318 | memset (&arm_record, 0, sizeof (insn_decode_record)); | |
13319 | arm_record.gdbarch = gdbarch; | |
13320 | ||
13321 | static const uint16_t insns[] = { | |
13322 | /* 1d ee 70 7f mrc 15, 0, r7, cr13, cr0, {3} */ | |
13323 | 0xee1d, 0x7f70, | |
13324 | }; | |
13325 | ||
13326 | enum bfd_endian endian = gdbarch_byte_order_for_code (arm_record.gdbarch); | |
13327 | instruction_reader_thumb reader (endian, insns); | |
13328 | int ret = decode_insn (reader, &arm_record, THUMB2_RECORD, | |
13329 | THUMB2_INSN_SIZE_BYTES); | |
13330 | ||
13331 | SELF_CHECK (ret == 0); | |
13332 | SELF_CHECK (arm_record.mem_rec_count == 0); | |
13333 | SELF_CHECK (arm_record.reg_rec_count == 1); | |
13334 | SELF_CHECK (arm_record.arm_regs[0] == 7); | |
13335 | } | |
13336 | } | |
13337 | } // namespace selftests | |
13338 | #endif /* GDB_SELF_TEST */ | |
72508ac0 PO |
13339 | |
13340 | /* Cleans up local record registers and memory allocations. */ | |
13341 | ||
13342 | static void | |
13343 | deallocate_reg_mem (insn_decode_record *record) | |
13344 | { | |
13345 | xfree (record->arm_regs); | |
13346 | xfree (record->arm_mems); | |
13347 | } | |
13348 | ||
13349 | ||
01e57735 | 13350 | /* Parse the current instruction and record the values of the registers and |
72508ac0 PO |
13351 | memory that will be changed in current instruction to record_arch_list". |
13352 | Return -1 if something is wrong. */ | |
13353 | ||
13354 | int | |
01e57735 YQ |
13355 | arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache, |
13356 | CORE_ADDR insn_addr) | |
72508ac0 PO |
13357 | { |
13358 | ||
72508ac0 PO |
13359 | uint32_t no_of_rec = 0; |
13360 | uint32_t ret = 0; /* return value: -1:record failure ; 0:success */ | |
13361 | ULONGEST t_bit = 0, insn_id = 0; | |
13362 | ||
13363 | ULONGEST u_regval = 0; | |
13364 | ||
13365 | insn_decode_record arm_record; | |
13366 | ||
13367 | memset (&arm_record, 0, sizeof (insn_decode_record)); | |
13368 | arm_record.regcache = regcache; | |
13369 | arm_record.this_addr = insn_addr; | |
13370 | arm_record.gdbarch = gdbarch; | |
13371 | ||
13372 | ||
13373 | if (record_debug > 1) | |
13374 | { | |
13375 | fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record " | |
01e57735 | 13376 | "addr = %s\n", |
72508ac0 PO |
13377 | paddress (gdbarch, arm_record.this_addr)); |
13378 | } | |
13379 | ||
728a7913 YQ |
13380 | instruction_reader reader; |
13381 | if (extract_arm_insn (reader, &arm_record, 2)) | |
72508ac0 PO |
13382 | { |
13383 | if (record_debug) | |
01e57735 YQ |
13384 | { |
13385 | printf_unfiltered (_("Process record: error reading memory at " | |
13386 | "addr %s len = %d.\n"), | |
13387 | paddress (arm_record.gdbarch, | |
13388 | arm_record.this_addr), 2); | |
13389 | } | |
72508ac0 PO |
13390 | return -1; |
13391 | } | |
13392 | ||
13393 | /* Check the insn, whether it is thumb or arm one. */ | |
13394 | ||
13395 | t_bit = arm_psr_thumb_bit (arm_record.gdbarch); | |
13396 | regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM, &u_regval); | |
13397 | ||
13398 | ||
13399 | if (!(u_regval & t_bit)) | |
13400 | { | |
13401 | /* We are decoding arm insn. */ | |
728a7913 | 13402 | ret = decode_insn (reader, &arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES); |
72508ac0 PO |
13403 | } |
13404 | else | |
13405 | { | |
13406 | insn_id = bits (arm_record.arm_insn, 11, 15); | |
13407 | /* is it thumb2 insn? */ | |
13408 | if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id)) | |
01e57735 | 13409 | { |
728a7913 | 13410 | ret = decode_insn (reader, &arm_record, THUMB2_RECORD, |
01e57735 YQ |
13411 | THUMB2_INSN_SIZE_BYTES); |
13412 | } | |
72508ac0 | 13413 | else |
01e57735 YQ |
13414 | { |
13415 | /* We are decoding thumb insn. */ | |
728a7913 YQ |
13416 | ret = decode_insn (reader, &arm_record, THUMB_RECORD, |
13417 | THUMB_INSN_SIZE_BYTES); | |
01e57735 | 13418 | } |
72508ac0 PO |
13419 | } |
13420 | ||
13421 | if (0 == ret) | |
13422 | { | |
13423 | /* Record registers. */ | |
25ea693b | 13424 | record_full_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM); |
72508ac0 | 13425 | if (arm_record.arm_regs) |
01e57735 YQ |
13426 | { |
13427 | for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count; no_of_rec++) | |
13428 | { | |
13429 | if (record_full_arch_list_add_reg | |
25ea693b | 13430 | (arm_record.regcache , arm_record.arm_regs[no_of_rec])) |
01e57735 YQ |
13431 | ret = -1; |
13432 | } | |
13433 | } | |
72508ac0 PO |
13434 | /* Record memories. */ |
13435 | if (arm_record.arm_mems) | |
01e57735 YQ |
13436 | { |
13437 | for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count; no_of_rec++) | |
13438 | { | |
13439 | if (record_full_arch_list_add_mem | |
13440 | ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr, | |
25ea693b | 13441 | arm_record.arm_mems[no_of_rec].len)) |
01e57735 YQ |
13442 | ret = -1; |
13443 | } | |
13444 | } | |
72508ac0 | 13445 | |
25ea693b | 13446 | if (record_full_arch_list_add_end ()) |
01e57735 | 13447 | ret = -1; |
72508ac0 PO |
13448 | } |
13449 | ||
13450 | ||
13451 | deallocate_reg_mem (&arm_record); | |
13452 | ||
13453 | return ret; | |
13454 | } | |
d105cce5 AH |
13455 | |
13456 | /* See arm-tdep.h. */ | |
13457 | ||
13458 | const target_desc * | |
13459 | arm_read_description (arm_fp_type fp_type) | |
13460 | { | |
13461 | struct target_desc *tdesc = tdesc_arm_list[fp_type]; | |
13462 | ||
13463 | if (tdesc == nullptr) | |
13464 | { | |
13465 | tdesc = arm_create_target_description (fp_type); | |
13466 | tdesc_arm_list[fp_type] = tdesc; | |
13467 | } | |
13468 | ||
13469 | return tdesc; | |
13470 | } | |
13471 | ||
13472 | /* See arm-tdep.h. */ | |
13473 | ||
13474 | const target_desc * | |
13475 | arm_read_mprofile_description (arm_m_profile_type m_type) | |
13476 | { | |
13477 | struct target_desc *tdesc = tdesc_arm_mprofile_list[m_type]; | |
13478 | ||
13479 | if (tdesc == nullptr) | |
13480 | { | |
13481 | tdesc = arm_create_mprofile_target_description (m_type); | |
13482 | tdesc_arm_mprofile_list[m_type] = tdesc; | |
13483 | } | |
13484 | ||
13485 | return tdesc; | |
13486 | } |