Commit | Line | Data |
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ed9a39eb | 1 | /* Common target dependent code for GDB on ARM systems. |
0fd88904 | 2 | |
ecd75fc8 | 3 | Copyright (C) 1988-2014 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 | ||
0963b4bd | 22 | #include <ctype.h> /* XXX for isupper (). */ |
34e8f22d | 23 | |
c906108c SS |
24 | #include "frame.h" |
25 | #include "inferior.h" | |
45741a9c | 26 | #include "infrun.h" |
c906108c SS |
27 | #include "gdbcmd.h" |
28 | #include "gdbcore.h" | |
0e9f083f | 29 | #include <string.h> |
0963b4bd | 30 | #include "dis-asm.h" /* For register styles. */ |
4e052eda | 31 | #include "regcache.h" |
54483882 | 32 | #include "reggroups.h" |
d16aafd8 | 33 | #include "doublest.h" |
fd0407d6 | 34 | #include "value.h" |
34e8f22d | 35 | #include "arch-utils.h" |
4be87837 | 36 | #include "osabi.h" |
eb5492fa DJ |
37 | #include "frame-unwind.h" |
38 | #include "frame-base.h" | |
39 | #include "trad-frame.h" | |
842e1f1e DJ |
40 | #include "objfiles.h" |
41 | #include "dwarf2-frame.h" | |
e4c16157 | 42 | #include "gdbtypes.h" |
29d73ae4 | 43 | #include "prologue-value.h" |
25f8c692 | 44 | #include "remote.h" |
123dc839 DJ |
45 | #include "target-descriptions.h" |
46 | #include "user-regs.h" | |
0e9e9abd | 47 | #include "observer.h" |
34e8f22d RE |
48 | |
49 | #include "arm-tdep.h" | |
26216b98 | 50 | #include "gdb/sim-arm.h" |
34e8f22d | 51 | |
082fc60d RE |
52 | #include "elf-bfd.h" |
53 | #include "coff/internal.h" | |
97e03143 | 54 | #include "elf/arm.h" |
c906108c | 55 | |
26216b98 | 56 | #include "gdb_assert.h" |
60c5725c | 57 | #include "vec.h" |
26216b98 | 58 | |
72508ac0 | 59 | #include "record.h" |
d02ed0bb | 60 | #include "record-full.h" |
72508ac0 | 61 | |
9779414d | 62 | #include "features/arm-with-m.c" |
25f8c692 | 63 | #include "features/arm-with-m-fpa-layout.c" |
3184d3f9 | 64 | #include "features/arm-with-m-vfp-d16.c" |
ef7e8358 UW |
65 | #include "features/arm-with-iwmmxt.c" |
66 | #include "features/arm-with-vfpv2.c" | |
67 | #include "features/arm-with-vfpv3.c" | |
68 | #include "features/arm-with-neon.c" | |
9779414d | 69 | |
6529d2dd AC |
70 | static int arm_debug; |
71 | ||
082fc60d RE |
72 | /* Macros for setting and testing a bit in a minimal symbol that marks |
73 | it as Thumb function. The MSB of the minimal symbol's "info" field | |
f594e5e9 | 74 | is used for this purpose. |
082fc60d RE |
75 | |
76 | MSYMBOL_SET_SPECIAL Actually sets the "special" bit. | |
f594e5e9 | 77 | MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */ |
082fc60d | 78 | |
0963b4bd | 79 | #define MSYMBOL_SET_SPECIAL(msym) \ |
b887350f | 80 | MSYMBOL_TARGET_FLAG_1 (msym) = 1 |
082fc60d RE |
81 | |
82 | #define MSYMBOL_IS_SPECIAL(msym) \ | |
b887350f | 83 | MSYMBOL_TARGET_FLAG_1 (msym) |
082fc60d | 84 | |
60c5725c DJ |
85 | /* Per-objfile data used for mapping symbols. */ |
86 | static const struct objfile_data *arm_objfile_data_key; | |
87 | ||
88 | struct arm_mapping_symbol | |
89 | { | |
90 | bfd_vma value; | |
91 | char type; | |
92 | }; | |
93 | typedef struct arm_mapping_symbol arm_mapping_symbol_s; | |
94 | DEF_VEC_O(arm_mapping_symbol_s); | |
95 | ||
96 | struct arm_per_objfile | |
97 | { | |
98 | VEC(arm_mapping_symbol_s) **section_maps; | |
99 | }; | |
100 | ||
afd7eef0 RE |
101 | /* The list of available "set arm ..." and "show arm ..." commands. */ |
102 | static struct cmd_list_element *setarmcmdlist = NULL; | |
103 | static struct cmd_list_element *showarmcmdlist = NULL; | |
104 | ||
fd50bc42 RE |
105 | /* The type of floating-point to use. Keep this in sync with enum |
106 | arm_float_model, and the help string in _initialize_arm_tdep. */ | |
40478521 | 107 | static const char *const fp_model_strings[] = |
fd50bc42 RE |
108 | { |
109 | "auto", | |
110 | "softfpa", | |
111 | "fpa", | |
112 | "softvfp", | |
28e97307 DJ |
113 | "vfp", |
114 | NULL | |
fd50bc42 RE |
115 | }; |
116 | ||
117 | /* A variable that can be configured by the user. */ | |
118 | static enum arm_float_model arm_fp_model = ARM_FLOAT_AUTO; | |
119 | static const char *current_fp_model = "auto"; | |
120 | ||
28e97307 | 121 | /* The ABI to use. Keep this in sync with arm_abi_kind. */ |
40478521 | 122 | static const char *const arm_abi_strings[] = |
28e97307 DJ |
123 | { |
124 | "auto", | |
125 | "APCS", | |
126 | "AAPCS", | |
127 | NULL | |
128 | }; | |
129 | ||
130 | /* A variable that can be configured by the user. */ | |
131 | static enum arm_abi_kind arm_abi_global = ARM_ABI_AUTO; | |
132 | static const char *arm_abi_string = "auto"; | |
133 | ||
0428b8f5 | 134 | /* The execution mode to assume. */ |
40478521 | 135 | static const char *const arm_mode_strings[] = |
0428b8f5 DJ |
136 | { |
137 | "auto", | |
138 | "arm", | |
68770265 MGD |
139 | "thumb", |
140 | NULL | |
0428b8f5 DJ |
141 | }; |
142 | ||
143 | static const char *arm_fallback_mode_string = "auto"; | |
144 | static const char *arm_force_mode_string = "auto"; | |
145 | ||
18819fa6 UW |
146 | /* Internal override of the execution mode. -1 means no override, |
147 | 0 means override to ARM mode, 1 means override to Thumb mode. | |
148 | The effect is the same as if arm_force_mode has been set by the | |
149 | user (except the internal override has precedence over a user's | |
150 | arm_force_mode override). */ | |
151 | static int arm_override_mode = -1; | |
152 | ||
94c30b78 | 153 | /* Number of different reg name sets (options). */ |
afd7eef0 | 154 | static int num_disassembly_options; |
bc90b915 | 155 | |
f32bf4a4 YQ |
156 | /* The standard register names, and all the valid aliases for them. Note |
157 | that `fp', `sp' and `pc' are not added in this alias list, because they | |
158 | have been added as builtin user registers in | |
159 | std-regs.c:_initialize_frame_reg. */ | |
123dc839 DJ |
160 | static const struct |
161 | { | |
162 | const char *name; | |
163 | int regnum; | |
164 | } arm_register_aliases[] = { | |
165 | /* Basic register numbers. */ | |
166 | { "r0", 0 }, | |
167 | { "r1", 1 }, | |
168 | { "r2", 2 }, | |
169 | { "r3", 3 }, | |
170 | { "r4", 4 }, | |
171 | { "r5", 5 }, | |
172 | { "r6", 6 }, | |
173 | { "r7", 7 }, | |
174 | { "r8", 8 }, | |
175 | { "r9", 9 }, | |
176 | { "r10", 10 }, | |
177 | { "r11", 11 }, | |
178 | { "r12", 12 }, | |
179 | { "r13", 13 }, | |
180 | { "r14", 14 }, | |
181 | { "r15", 15 }, | |
182 | /* Synonyms (argument and variable registers). */ | |
183 | { "a1", 0 }, | |
184 | { "a2", 1 }, | |
185 | { "a3", 2 }, | |
186 | { "a4", 3 }, | |
187 | { "v1", 4 }, | |
188 | { "v2", 5 }, | |
189 | { "v3", 6 }, | |
190 | { "v4", 7 }, | |
191 | { "v5", 8 }, | |
192 | { "v6", 9 }, | |
193 | { "v7", 10 }, | |
194 | { "v8", 11 }, | |
195 | /* Other platform-specific names for r9. */ | |
196 | { "sb", 9 }, | |
197 | { "tr", 9 }, | |
198 | /* Special names. */ | |
199 | { "ip", 12 }, | |
123dc839 | 200 | { "lr", 14 }, |
123dc839 DJ |
201 | /* Names used by GCC (not listed in the ARM EABI). */ |
202 | { "sl", 10 }, | |
123dc839 DJ |
203 | /* A special name from the older ATPCS. */ |
204 | { "wr", 7 }, | |
205 | }; | |
bc90b915 | 206 | |
123dc839 | 207 | static const char *const arm_register_names[] = |
da59e081 JM |
208 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
209 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ | |
210 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ | |
211 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ | |
212 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ | |
213 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ | |
94c30b78 | 214 | "fps", "cpsr" }; /* 24 25 */ |
ed9a39eb | 215 | |
afd7eef0 RE |
216 | /* Valid register name styles. */ |
217 | static const char **valid_disassembly_styles; | |
ed9a39eb | 218 | |
afd7eef0 RE |
219 | /* Disassembly style to use. Default to "std" register names. */ |
220 | static const char *disassembly_style; | |
96baa820 | 221 | |
ed9a39eb | 222 | /* This is used to keep the bfd arch_info in sync with the disassembly |
afd7eef0 RE |
223 | style. */ |
224 | static void set_disassembly_style_sfunc(char *, int, | |
ed9a39eb | 225 | struct cmd_list_element *); |
afd7eef0 | 226 | static void set_disassembly_style (void); |
ed9a39eb | 227 | |
b508a996 | 228 | static void convert_from_extended (const struct floatformat *, const void *, |
be8626e0 | 229 | void *, int); |
b508a996 | 230 | static void convert_to_extended (const struct floatformat *, void *, |
be8626e0 | 231 | const void *, int); |
ed9a39eb | 232 | |
05d1431c PA |
233 | static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch, |
234 | struct regcache *regcache, | |
235 | int regnum, gdb_byte *buf); | |
58d6951d DJ |
236 | static void arm_neon_quad_write (struct gdbarch *gdbarch, |
237 | struct regcache *regcache, | |
238 | int regnum, const gdb_byte *buf); | |
239 | ||
db24da6d YQ |
240 | static int thumb_insn_size (unsigned short inst1); |
241 | ||
9b8d791a | 242 | struct arm_prologue_cache |
c3b4394c | 243 | { |
eb5492fa DJ |
244 | /* The stack pointer at the time this frame was created; i.e. the |
245 | caller's stack pointer when this function was called. It is used | |
246 | to identify this frame. */ | |
247 | CORE_ADDR prev_sp; | |
248 | ||
4be43953 DJ |
249 | /* The frame base for this frame is just prev_sp - frame size. |
250 | FRAMESIZE is the distance from the frame pointer to the | |
251 | initial stack pointer. */ | |
eb5492fa | 252 | |
c3b4394c | 253 | int framesize; |
eb5492fa DJ |
254 | |
255 | /* The register used to hold the frame pointer for this frame. */ | |
c3b4394c | 256 | int framereg; |
eb5492fa DJ |
257 | |
258 | /* Saved register offsets. */ | |
259 | struct trad_frame_saved_reg *saved_regs; | |
c3b4394c | 260 | }; |
ed9a39eb | 261 | |
0d39a070 DJ |
262 | static CORE_ADDR arm_analyze_prologue (struct gdbarch *gdbarch, |
263 | CORE_ADDR prologue_start, | |
264 | CORE_ADDR prologue_end, | |
265 | struct arm_prologue_cache *cache); | |
266 | ||
cca44b1b JB |
267 | /* Architecture version for displaced stepping. This effects the behaviour of |
268 | certain instructions, and really should not be hard-wired. */ | |
269 | ||
270 | #define DISPLACED_STEPPING_ARCH_VERSION 5 | |
271 | ||
bc90b915 FN |
272 | /* Addresses for calling Thumb functions have the bit 0 set. |
273 | Here are some macros to test, set, or clear bit 0 of addresses. */ | |
274 | #define IS_THUMB_ADDR(addr) ((addr) & 1) | |
275 | #define MAKE_THUMB_ADDR(addr) ((addr) | 1) | |
276 | #define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1) | |
277 | ||
94c30b78 | 278 | /* Set to true if the 32-bit mode is in use. */ |
c906108c SS |
279 | |
280 | int arm_apcs_32 = 1; | |
281 | ||
9779414d DJ |
282 | /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */ |
283 | ||
478fd957 | 284 | int |
9779414d DJ |
285 | arm_psr_thumb_bit (struct gdbarch *gdbarch) |
286 | { | |
287 | if (gdbarch_tdep (gdbarch)->is_m) | |
288 | return XPSR_T; | |
289 | else | |
290 | return CPSR_T; | |
291 | } | |
292 | ||
b39cc962 DJ |
293 | /* Determine if FRAME is executing in Thumb mode. */ |
294 | ||
25b41d01 | 295 | int |
b39cc962 DJ |
296 | arm_frame_is_thumb (struct frame_info *frame) |
297 | { | |
298 | CORE_ADDR cpsr; | |
9779414d | 299 | ULONGEST t_bit = arm_psr_thumb_bit (get_frame_arch (frame)); |
b39cc962 DJ |
300 | |
301 | /* Every ARM frame unwinder can unwind the T bit of the CPSR, either | |
302 | directly (from a signal frame or dummy frame) or by interpreting | |
303 | the saved LR (from a prologue or DWARF frame). So consult it and | |
304 | trust the unwinders. */ | |
305 | cpsr = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
306 | ||
9779414d | 307 | return (cpsr & t_bit) != 0; |
b39cc962 DJ |
308 | } |
309 | ||
60c5725c DJ |
310 | /* Callback for VEC_lower_bound. */ |
311 | ||
312 | static inline int | |
313 | arm_compare_mapping_symbols (const struct arm_mapping_symbol *lhs, | |
314 | const struct arm_mapping_symbol *rhs) | |
315 | { | |
316 | return lhs->value < rhs->value; | |
317 | } | |
318 | ||
f9d67f43 DJ |
319 | /* Search for the mapping symbol covering MEMADDR. If one is found, |
320 | return its type. Otherwise, return 0. If START is non-NULL, | |
321 | set *START to the location of the mapping symbol. */ | |
c906108c | 322 | |
f9d67f43 DJ |
323 | static char |
324 | arm_find_mapping_symbol (CORE_ADDR memaddr, CORE_ADDR *start) | |
c906108c | 325 | { |
60c5725c | 326 | struct obj_section *sec; |
0428b8f5 | 327 | |
60c5725c DJ |
328 | /* If there are mapping symbols, consult them. */ |
329 | sec = find_pc_section (memaddr); | |
330 | if (sec != NULL) | |
331 | { | |
332 | struct arm_per_objfile *data; | |
333 | VEC(arm_mapping_symbol_s) *map; | |
aded6f54 PA |
334 | struct arm_mapping_symbol map_key = { memaddr - obj_section_addr (sec), |
335 | 0 }; | |
60c5725c DJ |
336 | unsigned int idx; |
337 | ||
338 | data = objfile_data (sec->objfile, arm_objfile_data_key); | |
339 | if (data != NULL) | |
340 | { | |
341 | map = data->section_maps[sec->the_bfd_section->index]; | |
342 | if (!VEC_empty (arm_mapping_symbol_s, map)) | |
343 | { | |
344 | struct arm_mapping_symbol *map_sym; | |
345 | ||
346 | idx = VEC_lower_bound (arm_mapping_symbol_s, map, &map_key, | |
347 | arm_compare_mapping_symbols); | |
348 | ||
349 | /* VEC_lower_bound finds the earliest ordered insertion | |
350 | point. If the following symbol starts at this exact | |
351 | address, we use that; otherwise, the preceding | |
352 | mapping symbol covers this address. */ | |
353 | if (idx < VEC_length (arm_mapping_symbol_s, map)) | |
354 | { | |
355 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx); | |
356 | if (map_sym->value == map_key.value) | |
f9d67f43 DJ |
357 | { |
358 | if (start) | |
359 | *start = map_sym->value + obj_section_addr (sec); | |
360 | return map_sym->type; | |
361 | } | |
60c5725c DJ |
362 | } |
363 | ||
364 | if (idx > 0) | |
365 | { | |
366 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx - 1); | |
f9d67f43 DJ |
367 | if (start) |
368 | *start = map_sym->value + obj_section_addr (sec); | |
369 | return map_sym->type; | |
60c5725c DJ |
370 | } |
371 | } | |
372 | } | |
373 | } | |
374 | ||
f9d67f43 DJ |
375 | return 0; |
376 | } | |
377 | ||
378 | /* Determine if the program counter specified in MEMADDR is in a Thumb | |
379 | function. This function should be called for addresses unrelated to | |
380 | any executing frame; otherwise, prefer arm_frame_is_thumb. */ | |
381 | ||
e3039479 | 382 | int |
9779414d | 383 | arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr) |
f9d67f43 | 384 | { |
7cbd4a93 | 385 | struct bound_minimal_symbol sym; |
f9d67f43 | 386 | char type; |
a42244db YQ |
387 | struct displaced_step_closure* dsc |
388 | = get_displaced_step_closure_by_addr(memaddr); | |
389 | ||
390 | /* If checking the mode of displaced instruction in copy area, the mode | |
391 | should be determined by instruction on the original address. */ | |
392 | if (dsc) | |
393 | { | |
394 | if (debug_displaced) | |
395 | fprintf_unfiltered (gdb_stdlog, | |
396 | "displaced: check mode of %.8lx instead of %.8lx\n", | |
397 | (unsigned long) dsc->insn_addr, | |
398 | (unsigned long) memaddr); | |
399 | memaddr = dsc->insn_addr; | |
400 | } | |
f9d67f43 DJ |
401 | |
402 | /* If bit 0 of the address is set, assume this is a Thumb address. */ | |
403 | if (IS_THUMB_ADDR (memaddr)) | |
404 | return 1; | |
405 | ||
18819fa6 UW |
406 | /* Respect internal mode override if active. */ |
407 | if (arm_override_mode != -1) | |
408 | return arm_override_mode; | |
409 | ||
f9d67f43 DJ |
410 | /* If the user wants to override the symbol table, let him. */ |
411 | if (strcmp (arm_force_mode_string, "arm") == 0) | |
412 | return 0; | |
413 | if (strcmp (arm_force_mode_string, "thumb") == 0) | |
414 | return 1; | |
415 | ||
9779414d DJ |
416 | /* ARM v6-M and v7-M are always in Thumb mode. */ |
417 | if (gdbarch_tdep (gdbarch)->is_m) | |
418 | return 1; | |
419 | ||
f9d67f43 DJ |
420 | /* If there are mapping symbols, consult them. */ |
421 | type = arm_find_mapping_symbol (memaddr, NULL); | |
422 | if (type) | |
423 | return type == 't'; | |
424 | ||
ed9a39eb | 425 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
c906108c | 426 | sym = lookup_minimal_symbol_by_pc (memaddr); |
7cbd4a93 TT |
427 | if (sym.minsym) |
428 | return (MSYMBOL_IS_SPECIAL (sym.minsym)); | |
0428b8f5 DJ |
429 | |
430 | /* If the user wants to override the fallback mode, let them. */ | |
431 | if (strcmp (arm_fallback_mode_string, "arm") == 0) | |
432 | return 0; | |
433 | if (strcmp (arm_fallback_mode_string, "thumb") == 0) | |
434 | return 1; | |
435 | ||
436 | /* If we couldn't find any symbol, but we're talking to a running | |
437 | target, then trust the current value of $cpsr. This lets | |
438 | "display/i $pc" always show the correct mode (though if there is | |
439 | a symbol table we will not reach here, so it still may not be | |
18819fa6 | 440 | displayed in the mode it will be executed). */ |
0428b8f5 | 441 | if (target_has_registers) |
18819fa6 | 442 | return arm_frame_is_thumb (get_current_frame ()); |
0428b8f5 DJ |
443 | |
444 | /* Otherwise we're out of luck; we assume ARM. */ | |
445 | return 0; | |
c906108c SS |
446 | } |
447 | ||
181c1381 | 448 | /* Remove useless bits from addresses in a running program. */ |
34e8f22d | 449 | static CORE_ADDR |
24568a2c | 450 | arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val) |
c906108c | 451 | { |
2ae28aa9 YQ |
452 | /* On M-profile devices, do not strip the low bit from EXC_RETURN |
453 | (the magic exception return address). */ | |
454 | if (gdbarch_tdep (gdbarch)->is_m | |
455 | && (val & 0xfffffff0) == 0xfffffff0) | |
456 | return val; | |
457 | ||
a3a2ee65 | 458 | if (arm_apcs_32) |
dd6be234 | 459 | return UNMAKE_THUMB_ADDR (val); |
c906108c | 460 | else |
a3a2ee65 | 461 | return (val & 0x03fffffc); |
c906108c SS |
462 | } |
463 | ||
0d39a070 | 464 | /* Return 1 if PC is the start of a compiler helper function which |
e0634ccf UW |
465 | can be safely ignored during prologue skipping. IS_THUMB is true |
466 | if the function is known to be a Thumb function due to the way it | |
467 | is being called. */ | |
0d39a070 | 468 | static int |
e0634ccf | 469 | skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb) |
0d39a070 | 470 | { |
e0634ccf | 471 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
7cbd4a93 | 472 | struct bound_minimal_symbol msym; |
0d39a070 DJ |
473 | |
474 | msym = lookup_minimal_symbol_by_pc (pc); | |
7cbd4a93 | 475 | if (msym.minsym != NULL |
77e371c0 | 476 | && BMSYMBOL_VALUE_ADDRESS (msym) == pc |
efd66ac6 | 477 | && MSYMBOL_LINKAGE_NAME (msym.minsym) != NULL) |
e0634ccf | 478 | { |
efd66ac6 | 479 | const char *name = MSYMBOL_LINKAGE_NAME (msym.minsym); |
0d39a070 | 480 | |
e0634ccf UW |
481 | /* The GNU linker's Thumb call stub to foo is named |
482 | __foo_from_thumb. */ | |
483 | if (strstr (name, "_from_thumb") != NULL) | |
484 | name += 2; | |
0d39a070 | 485 | |
e0634ccf UW |
486 | /* On soft-float targets, __truncdfsf2 is called to convert promoted |
487 | arguments to their argument types in non-prototyped | |
488 | functions. */ | |
489 | if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0) | |
490 | return 1; | |
491 | if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0) | |
492 | return 1; | |
0d39a070 | 493 | |
e0634ccf UW |
494 | /* Internal functions related to thread-local storage. */ |
495 | if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0) | |
496 | return 1; | |
497 | if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0) | |
498 | return 1; | |
499 | } | |
500 | else | |
501 | { | |
502 | /* If we run against a stripped glibc, we may be unable to identify | |
503 | special functions by name. Check for one important case, | |
504 | __aeabi_read_tp, by comparing the *code* against the default | |
505 | implementation (this is hand-written ARM assembler in glibc). */ | |
506 | ||
507 | if (!is_thumb | |
508 | && read_memory_unsigned_integer (pc, 4, byte_order_for_code) | |
509 | == 0xe3e00a0f /* mov r0, #0xffff0fff */ | |
510 | && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code) | |
511 | == 0xe240f01f) /* sub pc, r0, #31 */ | |
512 | return 1; | |
513 | } | |
ec3d575a | 514 | |
0d39a070 DJ |
515 | return 0; |
516 | } | |
517 | ||
518 | /* Support routines for instruction parsing. */ | |
519 | #define submask(x) ((1L << ((x) + 1)) - 1) | |
520 | #define bit(obj,st) (((obj) >> (st)) & 1) | |
521 | #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) | |
522 | #define sbits(obj,st,fn) \ | |
523 | ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st)))) | |
524 | #define BranchDest(addr,instr) \ | |
9991b207 | 525 | ((CORE_ADDR) (((unsigned long) (addr)) + 8 + (sbits (instr, 0, 23) << 2))) |
0d39a070 | 526 | |
621c6d5b YQ |
527 | /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is |
528 | the first 16-bit of instruction, and INSN2 is the second 16-bit of | |
529 | instruction. */ | |
530 | #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \ | |
531 | ((bits ((insn1), 0, 3) << 12) \ | |
532 | | (bits ((insn1), 10, 10) << 11) \ | |
533 | | (bits ((insn2), 12, 14) << 8) \ | |
534 | | bits ((insn2), 0, 7)) | |
535 | ||
536 | /* Extract the immediate from instruction movw/movt of encoding A. INSN is | |
537 | the 32-bit instruction. */ | |
538 | #define EXTRACT_MOVW_MOVT_IMM_A(insn) \ | |
539 | ((bits ((insn), 16, 19) << 12) \ | |
540 | | bits ((insn), 0, 11)) | |
541 | ||
ec3d575a UW |
542 | /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */ |
543 | ||
544 | static unsigned int | |
545 | thumb_expand_immediate (unsigned int imm) | |
546 | { | |
547 | unsigned int count = imm >> 7; | |
548 | ||
549 | if (count < 8) | |
550 | switch (count / 2) | |
551 | { | |
552 | case 0: | |
553 | return imm & 0xff; | |
554 | case 1: | |
555 | return (imm & 0xff) | ((imm & 0xff) << 16); | |
556 | case 2: | |
557 | return ((imm & 0xff) << 8) | ((imm & 0xff) << 24); | |
558 | case 3: | |
559 | return (imm & 0xff) | ((imm & 0xff) << 8) | |
560 | | ((imm & 0xff) << 16) | ((imm & 0xff) << 24); | |
561 | } | |
562 | ||
563 | return (0x80 | (imm & 0x7f)) << (32 - count); | |
564 | } | |
565 | ||
566 | /* Return 1 if the 16-bit Thumb instruction INST might change | |
567 | control flow, 0 otherwise. */ | |
568 | ||
569 | static int | |
570 | thumb_instruction_changes_pc (unsigned short inst) | |
571 | { | |
572 | if ((inst & 0xff00) == 0xbd00) /* pop {rlist, pc} */ | |
573 | return 1; | |
574 | ||
575 | if ((inst & 0xf000) == 0xd000) /* conditional branch */ | |
576 | return 1; | |
577 | ||
578 | if ((inst & 0xf800) == 0xe000) /* unconditional branch */ | |
579 | return 1; | |
580 | ||
581 | if ((inst & 0xff00) == 0x4700) /* bx REG, blx REG */ | |
582 | return 1; | |
583 | ||
ad8b5167 UW |
584 | if ((inst & 0xff87) == 0x4687) /* mov pc, REG */ |
585 | return 1; | |
586 | ||
ec3d575a UW |
587 | if ((inst & 0xf500) == 0xb100) /* CBNZ or CBZ. */ |
588 | return 1; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | /* Return 1 if the 32-bit Thumb instruction in INST1 and INST2 | |
594 | might change control flow, 0 otherwise. */ | |
595 | ||
596 | static int | |
597 | thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2) | |
598 | { | |
599 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
600 | { | |
601 | /* Branches and miscellaneous control instructions. */ | |
602 | ||
603 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
604 | { | |
605 | /* B, BL, BLX. */ | |
606 | return 1; | |
607 | } | |
608 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
609 | { | |
610 | /* SUBS PC, LR, #imm8. */ | |
611 | return 1; | |
612 | } | |
613 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) | |
614 | { | |
615 | /* Conditional branch. */ | |
616 | return 1; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | if ((inst1 & 0xfe50) == 0xe810) | |
623 | { | |
624 | /* Load multiple or RFE. */ | |
625 | ||
626 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
627 | { | |
628 | /* LDMIA or POP */ | |
629 | if (bit (inst2, 15)) | |
630 | return 1; | |
631 | } | |
632 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
633 | { | |
634 | /* LDMDB */ | |
635 | if (bit (inst2, 15)) | |
636 | return 1; | |
637 | } | |
638 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
639 | { | |
640 | /* RFEIA */ | |
641 | return 1; | |
642 | } | |
643 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
644 | { | |
645 | /* RFEDB */ | |
646 | return 1; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
653 | { | |
654 | /* MOV PC or MOVS PC. */ | |
655 | return 1; | |
656 | } | |
657 | ||
658 | if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
659 | { | |
660 | /* LDR PC. */ | |
661 | if (bits (inst1, 0, 3) == 15) | |
662 | return 1; | |
663 | if (bit (inst1, 7)) | |
664 | return 1; | |
665 | if (bit (inst2, 11)) | |
666 | return 1; | |
667 | if ((inst2 & 0x0fc0) == 0x0000) | |
668 | return 1; | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
674 | { | |
675 | /* TBB. */ | |
676 | return 1; | |
677 | } | |
678 | ||
679 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) | |
680 | { | |
681 | /* TBH. */ | |
682 | return 1; | |
683 | } | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
540314bd YQ |
688 | /* Return 1 if the 16-bit Thumb instruction INSN restores SP in |
689 | epilogue, 0 otherwise. */ | |
690 | ||
691 | static int | |
692 | thumb_instruction_restores_sp (unsigned short insn) | |
693 | { | |
694 | return (insn == 0x46bd /* mov sp, r7 */ | |
695 | || (insn & 0xff80) == 0xb000 /* add sp, imm */ | |
696 | || (insn & 0xfe00) == 0xbc00); /* pop <registers> */ | |
697 | } | |
698 | ||
29d73ae4 DJ |
699 | /* Analyze a Thumb prologue, looking for a recognizable stack frame |
700 | and frame pointer. Scan until we encounter a store that could | |
0d39a070 DJ |
701 | clobber the stack frame unexpectedly, or an unknown instruction. |
702 | Return the last address which is definitely safe to skip for an | |
703 | initial breakpoint. */ | |
c906108c SS |
704 | |
705 | static CORE_ADDR | |
29d73ae4 DJ |
706 | thumb_analyze_prologue (struct gdbarch *gdbarch, |
707 | CORE_ADDR start, CORE_ADDR limit, | |
708 | struct arm_prologue_cache *cache) | |
c906108c | 709 | { |
0d39a070 | 710 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
e17a4113 | 711 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
29d73ae4 DJ |
712 | int i; |
713 | pv_t regs[16]; | |
714 | struct pv_area *stack; | |
715 | struct cleanup *back_to; | |
716 | CORE_ADDR offset; | |
ec3d575a | 717 | CORE_ADDR unrecognized_pc = 0; |
da3c6d4a | 718 | |
29d73ae4 DJ |
719 | for (i = 0; i < 16; i++) |
720 | regs[i] = pv_register (i, 0); | |
55f960e1 | 721 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
29d73ae4 DJ |
722 | back_to = make_cleanup_free_pv_area (stack); |
723 | ||
29d73ae4 | 724 | while (start < limit) |
c906108c | 725 | { |
29d73ae4 DJ |
726 | unsigned short insn; |
727 | ||
e17a4113 | 728 | insn = read_memory_unsigned_integer (start, 2, byte_order_for_code); |
9d4fde75 | 729 | |
94c30b78 | 730 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
da59e081 | 731 | { |
29d73ae4 DJ |
732 | int regno; |
733 | int mask; | |
4be43953 DJ |
734 | |
735 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) | |
736 | break; | |
29d73ae4 DJ |
737 | |
738 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says | |
739 | whether to save LR (R14). */ | |
740 | mask = (insn & 0xff) | ((insn & 0x100) << 6); | |
741 | ||
742 | /* Calculate offsets of saved R0-R7 and LR. */ | |
743 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
744 | if (mask & (1 << regno)) | |
745 | { | |
29d73ae4 DJ |
746 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
747 | -4); | |
748 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); | |
749 | } | |
da59e081 | 750 | } |
1db01f22 | 751 | else if ((insn & 0xff80) == 0xb080) /* sub sp, #imm */ |
da59e081 | 752 | { |
29d73ae4 | 753 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
1db01f22 YQ |
754 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
755 | -offset); | |
da59e081 | 756 | } |
0d39a070 DJ |
757 | else if ((insn & 0xf800) == 0xa800) /* add Rd, sp, #imm */ |
758 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM], | |
759 | (insn & 0xff) << 2); | |
760 | else if ((insn & 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */ | |
761 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
762 | regs[bits (insn, 0, 2)] = pv_add_constant (regs[bits (insn, 3, 5)], | |
763 | bits (insn, 6, 8)); | |
764 | else if ((insn & 0xf800) == 0x3000 /* add Rd, #imm */ | |
765 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
766 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[bits (insn, 8, 10)], | |
767 | bits (insn, 0, 7)); | |
768 | else if ((insn & 0xfe00) == 0x1800 /* add Rd, Rn, Rm */ | |
769 | && pv_is_register (regs[bits (insn, 6, 8)], ARM_SP_REGNUM) | |
770 | && pv_is_constant (regs[bits (insn, 3, 5)])) | |
771 | regs[bits (insn, 0, 2)] = pv_add (regs[bits (insn, 3, 5)], | |
772 | regs[bits (insn, 6, 8)]); | |
773 | else if ((insn & 0xff00) == 0x4400 /* add Rd, Rm */ | |
774 | && pv_is_constant (regs[bits (insn, 3, 6)])) | |
775 | { | |
776 | int rd = (bit (insn, 7) << 3) + bits (insn, 0, 2); | |
777 | int rm = bits (insn, 3, 6); | |
778 | regs[rd] = pv_add (regs[rd], regs[rm]); | |
779 | } | |
29d73ae4 | 780 | else if ((insn & 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */ |
da59e081 | 781 | { |
29d73ae4 DJ |
782 | int dst_reg = (insn & 0x7) + ((insn & 0x80) >> 4); |
783 | int src_reg = (insn & 0x78) >> 3; | |
784 | regs[dst_reg] = regs[src_reg]; | |
da59e081 | 785 | } |
29d73ae4 | 786 | else if ((insn & 0xf800) == 0x9000) /* str rd, [sp, #off] */ |
da59e081 | 787 | { |
29d73ae4 DJ |
788 | /* Handle stores to the stack. Normally pushes are used, |
789 | but with GCC -mtpcs-frame, there may be other stores | |
790 | in the prologue to create the frame. */ | |
791 | int regno = (insn >> 8) & 0x7; | |
792 | pv_t addr; | |
793 | ||
794 | offset = (insn & 0xff) << 2; | |
795 | addr = pv_add_constant (regs[ARM_SP_REGNUM], offset); | |
796 | ||
797 | if (pv_area_store_would_trash (stack, addr)) | |
798 | break; | |
799 | ||
800 | pv_area_store (stack, addr, 4, regs[regno]); | |
da59e081 | 801 | } |
0d39a070 DJ |
802 | else if ((insn & 0xf800) == 0x6000) /* str rd, [rn, #off] */ |
803 | { | |
804 | int rd = bits (insn, 0, 2); | |
805 | int rn = bits (insn, 3, 5); | |
806 | pv_t addr; | |
807 | ||
808 | offset = bits (insn, 6, 10) << 2; | |
809 | addr = pv_add_constant (regs[rn], offset); | |
810 | ||
811 | if (pv_area_store_would_trash (stack, addr)) | |
812 | break; | |
813 | ||
814 | pv_area_store (stack, addr, 4, regs[rd]); | |
815 | } | |
816 | else if (((insn & 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */ | |
817 | || (insn & 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */ | |
818 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
819 | /* Ignore stores of argument registers to the stack. */ | |
820 | ; | |
821 | else if ((insn & 0xf800) == 0xc800 /* ldmia Rn!, { registers } */ | |
822 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
823 | /* Ignore block loads from the stack, potentially copying | |
824 | parameters from memory. */ | |
825 | ; | |
826 | else if ((insn & 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */ | |
827 | || ((insn & 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */ | |
828 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM))) | |
829 | /* Similarly ignore single loads from the stack. */ | |
830 | ; | |
831 | else if ((insn & 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */ | |
832 | || (insn & 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */ | |
833 | /* Skip register copies, i.e. saves to another register | |
834 | instead of the stack. */ | |
835 | ; | |
836 | else if ((insn & 0xf800) == 0x2000) /* movs Rd, #imm */ | |
837 | /* Recognize constant loads; even with small stacks these are necessary | |
838 | on Thumb. */ | |
839 | regs[bits (insn, 8, 10)] = pv_constant (bits (insn, 0, 7)); | |
840 | else if ((insn & 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */ | |
841 | { | |
842 | /* Constant pool loads, for the same reason. */ | |
843 | unsigned int constant; | |
844 | CORE_ADDR loc; | |
845 | ||
846 | loc = start + 4 + bits (insn, 0, 7) * 4; | |
847 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
848 | regs[bits (insn, 8, 10)] = pv_constant (constant); | |
849 | } | |
db24da6d | 850 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instructions. */ |
0d39a070 | 851 | { |
0d39a070 DJ |
852 | unsigned short inst2; |
853 | ||
854 | inst2 = read_memory_unsigned_integer (start + 2, 2, | |
855 | byte_order_for_code); | |
856 | ||
857 | if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800) | |
858 | { | |
859 | /* BL, BLX. Allow some special function calls when | |
860 | skipping the prologue; GCC generates these before | |
861 | storing arguments to the stack. */ | |
862 | CORE_ADDR nextpc; | |
863 | int j1, j2, imm1, imm2; | |
864 | ||
865 | imm1 = sbits (insn, 0, 10); | |
866 | imm2 = bits (inst2, 0, 10); | |
867 | j1 = bit (inst2, 13); | |
868 | j2 = bit (inst2, 11); | |
869 | ||
870 | offset = ((imm1 << 12) + (imm2 << 1)); | |
871 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
872 | ||
873 | nextpc = start + 4 + offset; | |
874 | /* For BLX make sure to clear the low bits. */ | |
875 | if (bit (inst2, 12) == 0) | |
876 | nextpc = nextpc & 0xfffffffc; | |
877 | ||
e0634ccf UW |
878 | if (!skip_prologue_function (gdbarch, nextpc, |
879 | bit (inst2, 12) != 0)) | |
0d39a070 DJ |
880 | break; |
881 | } | |
ec3d575a | 882 | |
0963b4bd MS |
883 | else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, |
884 | { registers } */ | |
ec3d575a UW |
885 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
886 | { | |
887 | pv_t addr = regs[bits (insn, 0, 3)]; | |
888 | int regno; | |
889 | ||
890 | if (pv_area_store_would_trash (stack, addr)) | |
891 | break; | |
892 | ||
893 | /* Calculate offsets of saved registers. */ | |
894 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
895 | if (inst2 & (1 << regno)) | |
896 | { | |
897 | addr = pv_add_constant (addr, -4); | |
898 | pv_area_store (stack, addr, 4, regs[regno]); | |
899 | } | |
900 | ||
901 | if (insn & 0x0020) | |
902 | regs[bits (insn, 0, 3)] = addr; | |
903 | } | |
904 | ||
0963b4bd MS |
905 | else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, |
906 | [Rn, #+/-imm]{!} */ | |
ec3d575a UW |
907 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
908 | { | |
909 | int regno1 = bits (inst2, 12, 15); | |
910 | int regno2 = bits (inst2, 8, 11); | |
911 | pv_t addr = regs[bits (insn, 0, 3)]; | |
912 | ||
913 | offset = inst2 & 0xff; | |
914 | if (insn & 0x0080) | |
915 | addr = pv_add_constant (addr, offset); | |
916 | else | |
917 | addr = pv_add_constant (addr, -offset); | |
918 | ||
919 | if (pv_area_store_would_trash (stack, addr)) | |
920 | break; | |
921 | ||
922 | pv_area_store (stack, addr, 4, regs[regno1]); | |
923 | pv_area_store (stack, pv_add_constant (addr, 4), | |
924 | 4, regs[regno2]); | |
925 | ||
926 | if (insn & 0x0020) | |
927 | regs[bits (insn, 0, 3)] = addr; | |
928 | } | |
929 | ||
930 | else if ((insn & 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */ | |
931 | && (inst2 & 0x0c00) == 0x0c00 | |
932 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
933 | { | |
934 | int regno = bits (inst2, 12, 15); | |
935 | pv_t addr = regs[bits (insn, 0, 3)]; | |
936 | ||
937 | offset = inst2 & 0xff; | |
938 | if (inst2 & 0x0200) | |
939 | addr = pv_add_constant (addr, offset); | |
940 | else | |
941 | addr = pv_add_constant (addr, -offset); | |
942 | ||
943 | if (pv_area_store_would_trash (stack, addr)) | |
944 | break; | |
945 | ||
946 | pv_area_store (stack, addr, 4, regs[regno]); | |
947 | ||
948 | if (inst2 & 0x0100) | |
949 | regs[bits (insn, 0, 3)] = addr; | |
950 | } | |
951 | ||
952 | else if ((insn & 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */ | |
953 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
954 | { | |
955 | int regno = bits (inst2, 12, 15); | |
956 | pv_t addr; | |
957 | ||
958 | offset = inst2 & 0xfff; | |
959 | addr = pv_add_constant (regs[bits (insn, 0, 3)], offset); | |
960 | ||
961 | if (pv_area_store_would_trash (stack, addr)) | |
962 | break; | |
963 | ||
964 | pv_area_store (stack, addr, 4, regs[regno]); | |
965 | } | |
966 | ||
967 | else if ((insn & 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */ | |
0d39a070 | 968 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 969 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 970 | ; |
ec3d575a UW |
971 | |
972 | else if ((insn & 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */ | |
973 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 974 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 975 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 976 | ; |
ec3d575a | 977 | |
0963b4bd MS |
978 | else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], |
979 | { registers } */ | |
ec3d575a UW |
980 | && (inst2 & 0x8000) == 0x0000 |
981 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
982 | /* Ignore block loads from the stack, potentially copying | |
983 | parameters from memory. */ | |
0d39a070 | 984 | ; |
ec3d575a | 985 | |
0963b4bd MS |
986 | else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2, |
987 | [Rn, #+/-imm] */ | |
0d39a070 | 988 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 989 | /* Similarly ignore dual loads from the stack. */ |
0d39a070 | 990 | ; |
ec3d575a UW |
991 | |
992 | else if ((insn & 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */ | |
993 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 994 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 995 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 996 | ; |
ec3d575a UW |
997 | |
998 | else if ((insn & 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */ | |
0d39a070 | 999 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 1000 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 1001 | ; |
ec3d575a UW |
1002 | |
1003 | else if ((insn & 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */ | |
1004 | && (inst2 & 0x8000) == 0x0000) | |
1005 | { | |
1006 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1007 | | (bits (inst2, 12, 14) << 8) | |
1008 | | bits (inst2, 0, 7)); | |
1009 | ||
1010 | regs[bits (inst2, 8, 11)] | |
1011 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1012 | thumb_expand_immediate (imm)); | |
1013 | } | |
1014 | ||
1015 | else if ((insn & 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */ | |
1016 | && (inst2 & 0x8000) == 0x0000) | |
0d39a070 | 1017 | { |
ec3d575a UW |
1018 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
1019 | | (bits (inst2, 12, 14) << 8) | |
1020 | | bits (inst2, 0, 7)); | |
1021 | ||
1022 | regs[bits (inst2, 8, 11)] | |
1023 | = pv_add_constant (regs[bits (insn, 0, 3)], imm); | |
1024 | } | |
1025 | ||
1026 | else if ((insn & 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */ | |
1027 | && (inst2 & 0x8000) == 0x0000) | |
1028 | { | |
1029 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1030 | | (bits (inst2, 12, 14) << 8) | |
1031 | | bits (inst2, 0, 7)); | |
1032 | ||
1033 | regs[bits (inst2, 8, 11)] | |
1034 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1035 | - (CORE_ADDR) thumb_expand_immediate (imm)); | |
1036 | } | |
1037 | ||
1038 | else if ((insn & 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */ | |
1039 | && (inst2 & 0x8000) == 0x0000) | |
1040 | { | |
1041 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1042 | | (bits (inst2, 12, 14) << 8) | |
1043 | | bits (inst2, 0, 7)); | |
1044 | ||
1045 | regs[bits (inst2, 8, 11)] | |
1046 | = pv_add_constant (regs[bits (insn, 0, 3)], - (CORE_ADDR) imm); | |
1047 | } | |
1048 | ||
1049 | else if ((insn & 0xfbff) == 0xf04f) /* mov.w Rd, #const */ | |
1050 | { | |
1051 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1052 | | (bits (inst2, 12, 14) << 8) | |
1053 | | bits (inst2, 0, 7)); | |
1054 | ||
1055 | regs[bits (inst2, 8, 11)] | |
1056 | = pv_constant (thumb_expand_immediate (imm)); | |
1057 | } | |
1058 | ||
1059 | else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1060 | { | |
621c6d5b YQ |
1061 | unsigned int imm |
1062 | = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2); | |
ec3d575a UW |
1063 | |
1064 | regs[bits (inst2, 8, 11)] = pv_constant (imm); | |
1065 | } | |
1066 | ||
1067 | else if (insn == 0xea5f /* mov.w Rd,Rm */ | |
1068 | && (inst2 & 0xf0f0) == 0) | |
1069 | { | |
1070 | int dst_reg = (inst2 & 0x0f00) >> 8; | |
1071 | int src_reg = inst2 & 0xf; | |
1072 | regs[dst_reg] = regs[src_reg]; | |
1073 | } | |
1074 | ||
1075 | else if ((insn & 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */ | |
1076 | { | |
1077 | /* Constant pool loads. */ | |
1078 | unsigned int constant; | |
1079 | CORE_ADDR loc; | |
1080 | ||
cac395ea | 1081 | offset = bits (inst2, 0, 11); |
ec3d575a UW |
1082 | if (insn & 0x0080) |
1083 | loc = start + 4 + offset; | |
1084 | else | |
1085 | loc = start + 4 - offset; | |
1086 | ||
1087 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1088 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1089 | } | |
1090 | ||
1091 | else if ((insn & 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */ | |
1092 | { | |
1093 | /* Constant pool loads. */ | |
1094 | unsigned int constant; | |
1095 | CORE_ADDR loc; | |
1096 | ||
cac395ea | 1097 | offset = bits (inst2, 0, 7) << 2; |
ec3d575a UW |
1098 | if (insn & 0x0080) |
1099 | loc = start + 4 + offset; | |
1100 | else | |
1101 | loc = start + 4 - offset; | |
1102 | ||
1103 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1104 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1105 | ||
1106 | constant = read_memory_unsigned_integer (loc + 4, 4, byte_order); | |
1107 | regs[bits (inst2, 8, 11)] = pv_constant (constant); | |
1108 | } | |
1109 | ||
1110 | else if (thumb2_instruction_changes_pc (insn, inst2)) | |
1111 | { | |
1112 | /* Don't scan past anything that might change control flow. */ | |
0d39a070 DJ |
1113 | break; |
1114 | } | |
ec3d575a UW |
1115 | else |
1116 | { | |
1117 | /* The optimizer might shove anything into the prologue, | |
1118 | so we just skip what we don't recognize. */ | |
1119 | unrecognized_pc = start; | |
1120 | } | |
0d39a070 DJ |
1121 | |
1122 | start += 2; | |
1123 | } | |
ec3d575a | 1124 | else if (thumb_instruction_changes_pc (insn)) |
3d74b771 | 1125 | { |
ec3d575a | 1126 | /* Don't scan past anything that might change control flow. */ |
da3c6d4a | 1127 | break; |
3d74b771 | 1128 | } |
ec3d575a UW |
1129 | else |
1130 | { | |
1131 | /* The optimizer might shove anything into the prologue, | |
1132 | so we just skip what we don't recognize. */ | |
1133 | unrecognized_pc = start; | |
1134 | } | |
29d73ae4 DJ |
1135 | |
1136 | start += 2; | |
c906108c SS |
1137 | } |
1138 | ||
0d39a070 DJ |
1139 | if (arm_debug) |
1140 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1141 | paddress (gdbarch, start)); | |
1142 | ||
ec3d575a UW |
1143 | if (unrecognized_pc == 0) |
1144 | unrecognized_pc = start; | |
1145 | ||
29d73ae4 DJ |
1146 | if (cache == NULL) |
1147 | { | |
1148 | do_cleanups (back_to); | |
ec3d575a | 1149 | return unrecognized_pc; |
29d73ae4 DJ |
1150 | } |
1151 | ||
29d73ae4 DJ |
1152 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
1153 | { | |
1154 | /* Frame pointer is fp. Frame size is constant. */ | |
1155 | cache->framereg = ARM_FP_REGNUM; | |
1156 | cache->framesize = -regs[ARM_FP_REGNUM].k; | |
1157 | } | |
1158 | else if (pv_is_register (regs[THUMB_FP_REGNUM], ARM_SP_REGNUM)) | |
1159 | { | |
1160 | /* Frame pointer is r7. Frame size is constant. */ | |
1161 | cache->framereg = THUMB_FP_REGNUM; | |
1162 | cache->framesize = -regs[THUMB_FP_REGNUM].k; | |
1163 | } | |
72a2e3dc | 1164 | else |
29d73ae4 DJ |
1165 | { |
1166 | /* Try the stack pointer... this is a bit desperate. */ | |
1167 | cache->framereg = ARM_SP_REGNUM; | |
1168 | cache->framesize = -regs[ARM_SP_REGNUM].k; | |
1169 | } | |
29d73ae4 DJ |
1170 | |
1171 | for (i = 0; i < 16; i++) | |
1172 | if (pv_area_find_reg (stack, gdbarch, i, &offset)) | |
1173 | cache->saved_regs[i].addr = offset; | |
1174 | ||
1175 | do_cleanups (back_to); | |
ec3d575a | 1176 | return unrecognized_pc; |
c906108c SS |
1177 | } |
1178 | ||
621c6d5b YQ |
1179 | |
1180 | /* Try to analyze the instructions starting from PC, which load symbol | |
1181 | __stack_chk_guard. Return the address of instruction after loading this | |
1182 | symbol, set the dest register number to *BASEREG, and set the size of | |
1183 | instructions for loading symbol in OFFSET. Return 0 if instructions are | |
1184 | not recognized. */ | |
1185 | ||
1186 | static CORE_ADDR | |
1187 | arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch, | |
1188 | unsigned int *destreg, int *offset) | |
1189 | { | |
1190 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1191 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1192 | unsigned int low, high, address; | |
1193 | ||
1194 | address = 0; | |
1195 | if (is_thumb) | |
1196 | { | |
1197 | unsigned short insn1 | |
1198 | = read_memory_unsigned_integer (pc, 2, byte_order_for_code); | |
1199 | ||
1200 | if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */ | |
1201 | { | |
1202 | *destreg = bits (insn1, 8, 10); | |
1203 | *offset = 2; | |
1204 | address = bits (insn1, 0, 7); | |
1205 | } | |
1206 | else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1207 | { | |
1208 | unsigned short insn2 | |
1209 | = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
1210 | ||
1211 | low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1212 | ||
1213 | insn1 | |
1214 | = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code); | |
1215 | insn2 | |
1216 | = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code); | |
1217 | ||
1218 | /* movt Rd, #const */ | |
1219 | if ((insn1 & 0xfbc0) == 0xf2c0) | |
1220 | { | |
1221 | high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1222 | *destreg = bits (insn2, 8, 11); | |
1223 | *offset = 8; | |
1224 | address = (high << 16 | low); | |
1225 | } | |
1226 | } | |
1227 | } | |
1228 | else | |
1229 | { | |
2e9e421f UW |
1230 | unsigned int insn |
1231 | = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
1232 | ||
1233 | if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, #immed */ | |
1234 | { | |
1235 | address = bits (insn, 0, 11); | |
1236 | *destreg = bits (insn, 12, 15); | |
1237 | *offset = 4; | |
1238 | } | |
1239 | else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */ | |
1240 | { | |
1241 | low = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1242 | ||
1243 | insn | |
1244 | = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code); | |
1245 | ||
1246 | if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */ | |
1247 | { | |
1248 | high = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1249 | *destreg = bits (insn, 12, 15); | |
1250 | *offset = 8; | |
1251 | address = (high << 16 | low); | |
1252 | } | |
1253 | } | |
621c6d5b YQ |
1254 | } |
1255 | ||
1256 | return address; | |
1257 | } | |
1258 | ||
1259 | /* Try to skip a sequence of instructions used for stack protector. If PC | |
0963b4bd MS |
1260 | points to the first instruction of this sequence, return the address of |
1261 | first instruction after this sequence, otherwise, return original PC. | |
621c6d5b YQ |
1262 | |
1263 | On arm, this sequence of instructions is composed of mainly three steps, | |
1264 | Step 1: load symbol __stack_chk_guard, | |
1265 | Step 2: load from address of __stack_chk_guard, | |
1266 | Step 3: store it to somewhere else. | |
1267 | ||
1268 | Usually, instructions on step 2 and step 3 are the same on various ARM | |
1269 | architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and | |
1270 | on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However, | |
1271 | instructions in step 1 vary from different ARM architectures. On ARMv7, | |
1272 | they are, | |
1273 | ||
1274 | movw Rn, #:lower16:__stack_chk_guard | |
1275 | movt Rn, #:upper16:__stack_chk_guard | |
1276 | ||
1277 | On ARMv5t, it is, | |
1278 | ||
1279 | ldr Rn, .Label | |
1280 | .... | |
1281 | .Lable: | |
1282 | .word __stack_chk_guard | |
1283 | ||
1284 | Since ldr/str is a very popular instruction, we can't use them as | |
1285 | 'fingerprint' or 'signature' of stack protector sequence. Here we choose | |
1286 | sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not | |
1287 | stripped, as the 'fingerprint' of a stack protector cdoe sequence. */ | |
1288 | ||
1289 | static CORE_ADDR | |
1290 | arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch) | |
1291 | { | |
1292 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
22e048c9 | 1293 | unsigned int basereg; |
7cbd4a93 | 1294 | struct bound_minimal_symbol stack_chk_guard; |
621c6d5b YQ |
1295 | int offset; |
1296 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1297 | CORE_ADDR addr; | |
1298 | ||
1299 | /* Try to parse the instructions in Step 1. */ | |
1300 | addr = arm_analyze_load_stack_chk_guard (pc, gdbarch, | |
1301 | &basereg, &offset); | |
1302 | if (!addr) | |
1303 | return pc; | |
1304 | ||
1305 | stack_chk_guard = lookup_minimal_symbol_by_pc (addr); | |
1306 | /* If name of symbol doesn't start with '__stack_chk_guard', this | |
1307 | instruction sequence is not for stack protector. If symbol is | |
1308 | removed, we conservatively think this sequence is for stack protector. */ | |
7cbd4a93 | 1309 | if (stack_chk_guard.minsym |
efd66ac6 | 1310 | && strncmp (MSYMBOL_LINKAGE_NAME (stack_chk_guard.minsym), |
7cbd4a93 | 1311 | "__stack_chk_guard", |
c1c2ab58 | 1312 | strlen ("__stack_chk_guard")) != 0) |
621c6d5b YQ |
1313 | return pc; |
1314 | ||
1315 | if (is_thumb) | |
1316 | { | |
1317 | unsigned int destreg; | |
1318 | unsigned short insn | |
1319 | = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code); | |
1320 | ||
1321 | /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */ | |
1322 | if ((insn & 0xf800) != 0x6800) | |
1323 | return pc; | |
1324 | if (bits (insn, 3, 5) != basereg) | |
1325 | return pc; | |
1326 | destreg = bits (insn, 0, 2); | |
1327 | ||
1328 | insn = read_memory_unsigned_integer (pc + offset + 2, 2, | |
1329 | byte_order_for_code); | |
1330 | /* Step 3: str Rd, [Rn, #immed], encoding T1. */ | |
1331 | if ((insn & 0xf800) != 0x6000) | |
1332 | return pc; | |
1333 | if (destreg != bits (insn, 0, 2)) | |
1334 | return pc; | |
1335 | } | |
1336 | else | |
1337 | { | |
1338 | unsigned int destreg; | |
1339 | unsigned int insn | |
1340 | = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code); | |
1341 | ||
1342 | /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */ | |
1343 | if ((insn & 0x0e500000) != 0x04100000) | |
1344 | return pc; | |
1345 | if (bits (insn, 16, 19) != basereg) | |
1346 | return pc; | |
1347 | destreg = bits (insn, 12, 15); | |
1348 | /* Step 3: str Rd, [Rn, #immed], encoding A1. */ | |
1349 | insn = read_memory_unsigned_integer (pc + offset + 4, | |
1350 | 4, byte_order_for_code); | |
1351 | if ((insn & 0x0e500000) != 0x04000000) | |
1352 | return pc; | |
1353 | if (bits (insn, 12, 15) != destreg) | |
1354 | return pc; | |
1355 | } | |
1356 | /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8 | |
1357 | on arm. */ | |
1358 | if (is_thumb) | |
1359 | return pc + offset + 4; | |
1360 | else | |
1361 | return pc + offset + 8; | |
1362 | } | |
1363 | ||
da3c6d4a MS |
1364 | /* Advance the PC across any function entry prologue instructions to |
1365 | reach some "real" code. | |
34e8f22d RE |
1366 | |
1367 | The APCS (ARM Procedure Call Standard) defines the following | |
ed9a39eb | 1368 | prologue: |
c906108c | 1369 | |
c5aa993b JM |
1370 | mov ip, sp |
1371 | [stmfd sp!, {a1,a2,a3,a4}] | |
1372 | stmfd sp!, {...,fp,ip,lr,pc} | |
ed9a39eb JM |
1373 | [stfe f7, [sp, #-12]!] |
1374 | [stfe f6, [sp, #-12]!] | |
1375 | [stfe f5, [sp, #-12]!] | |
1376 | [stfe f4, [sp, #-12]!] | |
0963b4bd | 1377 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */ |
c906108c | 1378 | |
34e8f22d | 1379 | static CORE_ADDR |
6093d2eb | 1380 | arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
c906108c | 1381 | { |
e17a4113 | 1382 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
c906108c SS |
1383 | unsigned long inst; |
1384 | CORE_ADDR skip_pc; | |
a89fea3c | 1385 | CORE_ADDR func_addr, limit_pc; |
c906108c | 1386 | |
a89fea3c JL |
1387 | /* See if we can determine the end of the prologue via the symbol table. |
1388 | If so, then return either PC, or the PC after the prologue, whichever | |
1389 | is greater. */ | |
1390 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
c906108c | 1391 | { |
d80b854b UW |
1392 | CORE_ADDR post_prologue_pc |
1393 | = skip_prologue_using_sal (gdbarch, func_addr); | |
0d39a070 DJ |
1394 | struct symtab *s = find_pc_symtab (func_addr); |
1395 | ||
621c6d5b YQ |
1396 | if (post_prologue_pc) |
1397 | post_prologue_pc | |
1398 | = arm_skip_stack_protector (post_prologue_pc, gdbarch); | |
1399 | ||
1400 | ||
0d39a070 DJ |
1401 | /* GCC always emits a line note before the prologue and another |
1402 | one after, even if the two are at the same address or on the | |
1403 | same line. Take advantage of this so that we do not need to | |
1404 | know every instruction that might appear in the prologue. We | |
1405 | will have producer information for most binaries; if it is | |
1406 | missing (e.g. for -gstabs), assuming the GNU tools. */ | |
1407 | if (post_prologue_pc | |
1408 | && (s == NULL | |
1409 | || s->producer == NULL | |
9ead7ae4 KB |
1410 | || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0 |
1411 | || strncmp (s->producer, "clang ", sizeof ("clang ") - 1) == 0)) | |
0d39a070 DJ |
1412 | return post_prologue_pc; |
1413 | ||
a89fea3c | 1414 | if (post_prologue_pc != 0) |
0d39a070 DJ |
1415 | { |
1416 | CORE_ADDR analyzed_limit; | |
1417 | ||
1418 | /* For non-GCC compilers, make sure the entire line is an | |
1419 | acceptable prologue; GDB will round this function's | |
1420 | return value up to the end of the following line so we | |
1421 | can not skip just part of a line (and we do not want to). | |
1422 | ||
1423 | RealView does not treat the prologue specially, but does | |
1424 | associate prologue code with the opening brace; so this | |
1425 | lets us skip the first line if we think it is the opening | |
1426 | brace. */ | |
9779414d | 1427 | if (arm_pc_is_thumb (gdbarch, func_addr)) |
0d39a070 DJ |
1428 | analyzed_limit = thumb_analyze_prologue (gdbarch, func_addr, |
1429 | post_prologue_pc, NULL); | |
1430 | else | |
1431 | analyzed_limit = arm_analyze_prologue (gdbarch, func_addr, | |
1432 | post_prologue_pc, NULL); | |
1433 | ||
1434 | if (analyzed_limit != post_prologue_pc) | |
1435 | return func_addr; | |
1436 | ||
1437 | return post_prologue_pc; | |
1438 | } | |
c906108c SS |
1439 | } |
1440 | ||
a89fea3c JL |
1441 | /* Can't determine prologue from the symbol table, need to examine |
1442 | instructions. */ | |
c906108c | 1443 | |
a89fea3c JL |
1444 | /* Find an upper limit on the function prologue using the debug |
1445 | information. If the debug information could not be used to provide | |
1446 | that bound, then use an arbitrary large number as the upper bound. */ | |
0963b4bd | 1447 | /* Like arm_scan_prologue, stop no later than pc + 64. */ |
d80b854b | 1448 | limit_pc = skip_prologue_using_sal (gdbarch, pc); |
a89fea3c JL |
1449 | if (limit_pc == 0) |
1450 | limit_pc = pc + 64; /* Magic. */ | |
1451 | ||
c906108c | 1452 | |
29d73ae4 | 1453 | /* Check if this is Thumb code. */ |
9779414d | 1454 | if (arm_pc_is_thumb (gdbarch, pc)) |
a89fea3c | 1455 | return thumb_analyze_prologue (gdbarch, pc, limit_pc, NULL); |
29d73ae4 | 1456 | |
a89fea3c | 1457 | for (skip_pc = pc; skip_pc < limit_pc; skip_pc += 4) |
f43845b3 | 1458 | { |
e17a4113 | 1459 | inst = read_memory_unsigned_integer (skip_pc, 4, byte_order_for_code); |
9d4fde75 | 1460 | |
b8d5e71d MS |
1461 | /* "mov ip, sp" is no longer a required part of the prologue. */ |
1462 | if (inst == 0xe1a0c00d) /* mov ip, sp */ | |
1463 | continue; | |
c906108c | 1464 | |
28cd8767 JG |
1465 | if ((inst & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */ |
1466 | continue; | |
1467 | ||
1468 | if ((inst & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */ | |
1469 | continue; | |
1470 | ||
b8d5e71d MS |
1471 | /* Some prologues begin with "str lr, [sp, #-4]!". */ |
1472 | if (inst == 0xe52de004) /* str lr, [sp, #-4]! */ | |
1473 | continue; | |
c906108c | 1474 | |
b8d5e71d MS |
1475 | if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */ |
1476 | continue; | |
c906108c | 1477 | |
b8d5e71d MS |
1478 | if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */ |
1479 | continue; | |
11d3b27d | 1480 | |
b8d5e71d MS |
1481 | /* Any insns after this point may float into the code, if it makes |
1482 | for better instruction scheduling, so we skip them only if we | |
1483 | find them, but still consider the function to be frame-ful. */ | |
f43845b3 | 1484 | |
b8d5e71d MS |
1485 | /* We may have either one sfmfd instruction here, or several stfe |
1486 | insns, depending on the version of floating point code we | |
1487 | support. */ | |
1488 | if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */ | |
1489 | continue; | |
1490 | ||
1491 | if ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */ | |
1492 | continue; | |
1493 | ||
1494 | if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */ | |
1495 | continue; | |
1496 | ||
1497 | if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */ | |
1498 | continue; | |
1499 | ||
f8bf5763 PM |
1500 | if ((inst & 0xffffc000) == 0xe54b0000 /* strb r(0123),[r11,#-nn] */ |
1501 | || (inst & 0xffffc0f0) == 0xe14b00b0 /* strh r(0123),[r11,#-nn] */ | |
1502 | || (inst & 0xffffc000) == 0xe50b0000) /* str r(0123),[r11,#-nn] */ | |
b8d5e71d MS |
1503 | continue; |
1504 | ||
f8bf5763 PM |
1505 | if ((inst & 0xffffc000) == 0xe5cd0000 /* strb r(0123),[sp,#nn] */ |
1506 | || (inst & 0xffffc0f0) == 0xe1cd00b0 /* strh r(0123),[sp,#nn] */ | |
1507 | || (inst & 0xffffc000) == 0xe58d0000) /* str r(0123),[sp,#nn] */ | |
b8d5e71d MS |
1508 | continue; |
1509 | ||
1510 | /* Un-recognized instruction; stop scanning. */ | |
1511 | break; | |
f43845b3 | 1512 | } |
c906108c | 1513 | |
0963b4bd | 1514 | return skip_pc; /* End of prologue. */ |
c906108c | 1515 | } |
94c30b78 | 1516 | |
c5aa993b | 1517 | /* *INDENT-OFF* */ |
c906108c SS |
1518 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
1519 | This function decodes a Thumb function prologue to determine: | |
1520 | 1) the size of the stack frame | |
1521 | 2) which registers are saved on it | |
1522 | 3) the offsets of saved regs | |
1523 | 4) the offset from the stack pointer to the frame pointer | |
c906108c | 1524 | |
da59e081 JM |
1525 | A typical Thumb function prologue would create this stack frame |
1526 | (offsets relative to FP) | |
c906108c SS |
1527 | old SP -> 24 stack parameters |
1528 | 20 LR | |
1529 | 16 R7 | |
1530 | R7 -> 0 local variables (16 bytes) | |
1531 | SP -> -12 additional stack space (12 bytes) | |
1532 | The frame size would thus be 36 bytes, and the frame offset would be | |
0963b4bd | 1533 | 12 bytes. The frame register is R7. |
da59e081 | 1534 | |
da3c6d4a MS |
1535 | The comments for thumb_skip_prolog() describe the algorithm we use |
1536 | to detect the end of the prolog. */ | |
c5aa993b JM |
1537 | /* *INDENT-ON* */ |
1538 | ||
c906108c | 1539 | static void |
be8626e0 | 1540 | thumb_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR prev_pc, |
b39cc962 | 1541 | CORE_ADDR block_addr, struct arm_prologue_cache *cache) |
c906108c SS |
1542 | { |
1543 | CORE_ADDR prologue_start; | |
1544 | CORE_ADDR prologue_end; | |
c906108c | 1545 | |
b39cc962 DJ |
1546 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
1547 | &prologue_end)) | |
c906108c | 1548 | { |
ec3d575a UW |
1549 | /* See comment in arm_scan_prologue for an explanation of |
1550 | this heuristics. */ | |
1551 | if (prologue_end > prologue_start + 64) | |
1552 | { | |
1553 | prologue_end = prologue_start + 64; | |
1554 | } | |
c906108c SS |
1555 | } |
1556 | else | |
f7060f85 DJ |
1557 | /* We're in the boondocks: we have no idea where the start of the |
1558 | function is. */ | |
1559 | return; | |
c906108c | 1560 | |
eb5492fa | 1561 | prologue_end = min (prologue_end, prev_pc); |
c906108c | 1562 | |
be8626e0 | 1563 | thumb_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); |
c906108c SS |
1564 | } |
1565 | ||
0d39a070 | 1566 | /* Return 1 if THIS_INSTR might change control flow, 0 otherwise. */ |
c906108c | 1567 | |
0d39a070 DJ |
1568 | static int |
1569 | arm_instruction_changes_pc (uint32_t this_instr) | |
c906108c | 1570 | { |
0d39a070 DJ |
1571 | if (bits (this_instr, 28, 31) == INST_NV) |
1572 | /* Unconditional instructions. */ | |
1573 | switch (bits (this_instr, 24, 27)) | |
1574 | { | |
1575 | case 0xa: | |
1576 | case 0xb: | |
1577 | /* Branch with Link and change to Thumb. */ | |
1578 | return 1; | |
1579 | case 0xc: | |
1580 | case 0xd: | |
1581 | case 0xe: | |
1582 | /* Coprocessor register transfer. */ | |
1583 | if (bits (this_instr, 12, 15) == 15) | |
1584 | error (_("Invalid update to pc in instruction")); | |
1585 | return 0; | |
1586 | default: | |
1587 | return 0; | |
1588 | } | |
1589 | else | |
1590 | switch (bits (this_instr, 25, 27)) | |
1591 | { | |
1592 | case 0x0: | |
1593 | if (bits (this_instr, 23, 24) == 2 && bit (this_instr, 20) == 0) | |
1594 | { | |
1595 | /* Multiplies and extra load/stores. */ | |
1596 | if (bit (this_instr, 4) == 1 && bit (this_instr, 7) == 1) | |
1597 | /* Neither multiplies nor extension load/stores are allowed | |
1598 | to modify PC. */ | |
1599 | return 0; | |
1600 | ||
1601 | /* Otherwise, miscellaneous instructions. */ | |
1602 | ||
1603 | /* BX <reg>, BXJ <reg>, BLX <reg> */ | |
1604 | if (bits (this_instr, 4, 27) == 0x12fff1 | |
1605 | || bits (this_instr, 4, 27) == 0x12fff2 | |
1606 | || bits (this_instr, 4, 27) == 0x12fff3) | |
1607 | return 1; | |
1608 | ||
1609 | /* Other miscellaneous instructions are unpredictable if they | |
1610 | modify PC. */ | |
1611 | return 0; | |
1612 | } | |
1613 | /* Data processing instruction. Fall through. */ | |
c906108c | 1614 | |
0d39a070 DJ |
1615 | case 0x1: |
1616 | if (bits (this_instr, 12, 15) == 15) | |
1617 | return 1; | |
1618 | else | |
1619 | return 0; | |
c906108c | 1620 | |
0d39a070 DJ |
1621 | case 0x2: |
1622 | case 0x3: | |
1623 | /* Media instructions and architecturally undefined instructions. */ | |
1624 | if (bits (this_instr, 25, 27) == 3 && bit (this_instr, 4) == 1) | |
1625 | return 0; | |
c906108c | 1626 | |
0d39a070 DJ |
1627 | /* Stores. */ |
1628 | if (bit (this_instr, 20) == 0) | |
1629 | return 0; | |
2a451106 | 1630 | |
0d39a070 DJ |
1631 | /* Loads. */ |
1632 | if (bits (this_instr, 12, 15) == ARM_PC_REGNUM) | |
1633 | return 1; | |
1634 | else | |
1635 | return 0; | |
2a451106 | 1636 | |
0d39a070 DJ |
1637 | case 0x4: |
1638 | /* Load/store multiple. */ | |
1639 | if (bit (this_instr, 20) == 1 && bit (this_instr, 15) == 1) | |
1640 | return 1; | |
1641 | else | |
1642 | return 0; | |
2a451106 | 1643 | |
0d39a070 DJ |
1644 | case 0x5: |
1645 | /* Branch and branch with link. */ | |
1646 | return 1; | |
2a451106 | 1647 | |
0d39a070 DJ |
1648 | case 0x6: |
1649 | case 0x7: | |
1650 | /* Coprocessor transfers or SWIs can not affect PC. */ | |
1651 | return 0; | |
eb5492fa | 1652 | |
0d39a070 | 1653 | default: |
9b20d036 | 1654 | internal_error (__FILE__, __LINE__, _("bad value in switch")); |
0d39a070 DJ |
1655 | } |
1656 | } | |
c906108c | 1657 | |
0d39a070 DJ |
1658 | /* Analyze an ARM mode prologue starting at PROLOGUE_START and |
1659 | continuing no further than PROLOGUE_END. If CACHE is non-NULL, | |
1660 | fill it in. Return the first address not recognized as a prologue | |
1661 | instruction. | |
eb5492fa | 1662 | |
0d39a070 DJ |
1663 | We recognize all the instructions typically found in ARM prologues, |
1664 | plus harmless instructions which can be skipped (either for analysis | |
1665 | purposes, or a more restrictive set that can be skipped when finding | |
1666 | the end of the prologue). */ | |
1667 | ||
1668 | static CORE_ADDR | |
1669 | arm_analyze_prologue (struct gdbarch *gdbarch, | |
1670 | CORE_ADDR prologue_start, CORE_ADDR prologue_end, | |
1671 | struct arm_prologue_cache *cache) | |
1672 | { | |
1673 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1674 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1675 | int regno; | |
1676 | CORE_ADDR offset, current_pc; | |
1677 | pv_t regs[ARM_FPS_REGNUM]; | |
1678 | struct pv_area *stack; | |
1679 | struct cleanup *back_to; | |
1680 | int framereg, framesize; | |
1681 | CORE_ADDR unrecognized_pc = 0; | |
1682 | ||
1683 | /* Search the prologue looking for instructions that set up the | |
96baa820 | 1684 | frame pointer, adjust the stack pointer, and save registers. |
ed9a39eb | 1685 | |
96baa820 JM |
1686 | Be careful, however, and if it doesn't look like a prologue, |
1687 | don't try to scan it. If, for instance, a frameless function | |
1688 | begins with stmfd sp!, then we will tell ourselves there is | |
b8d5e71d | 1689 | a frame, which will confuse stack traceback, as well as "finish" |
96baa820 | 1690 | and other operations that rely on a knowledge of the stack |
0d39a070 | 1691 | traceback. */ |
d4473757 | 1692 | |
4be43953 DJ |
1693 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) |
1694 | regs[regno] = pv_register (regno, 0); | |
55f960e1 | 1695 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
4be43953 DJ |
1696 | back_to = make_cleanup_free_pv_area (stack); |
1697 | ||
94c30b78 MS |
1698 | for (current_pc = prologue_start; |
1699 | current_pc < prologue_end; | |
f43845b3 | 1700 | current_pc += 4) |
96baa820 | 1701 | { |
e17a4113 UW |
1702 | unsigned int insn |
1703 | = read_memory_unsigned_integer (current_pc, 4, byte_order_for_code); | |
9d4fde75 | 1704 | |
94c30b78 | 1705 | if (insn == 0xe1a0c00d) /* mov ip, sp */ |
f43845b3 | 1706 | { |
4be43953 | 1707 | regs[ARM_IP_REGNUM] = regs[ARM_SP_REGNUM]; |
28cd8767 JG |
1708 | continue; |
1709 | } | |
0d39a070 DJ |
1710 | else if ((insn & 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */ |
1711 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1712 | { |
1713 | unsigned imm = insn & 0xff; /* immediate value */ | |
1714 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1715 | int rd = bits (insn, 12, 15); |
28cd8767 | 1716 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1717 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], imm); |
28cd8767 JG |
1718 | continue; |
1719 | } | |
0d39a070 DJ |
1720 | else if ((insn & 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */ |
1721 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1722 | { |
1723 | unsigned imm = insn & 0xff; /* immediate value */ | |
1724 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1725 | int rd = bits (insn, 12, 15); |
28cd8767 | 1726 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1727 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], -imm); |
f43845b3 MS |
1728 | continue; |
1729 | } | |
0963b4bd MS |
1730 | else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd, |
1731 | [sp, #-4]! */ | |
f43845b3 | 1732 | { |
4be43953 DJ |
1733 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1734 | break; | |
1735 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
0d39a070 DJ |
1736 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, |
1737 | regs[bits (insn, 12, 15)]); | |
f43845b3 MS |
1738 | continue; |
1739 | } | |
1740 | else if ((insn & 0xffff0000) == 0xe92d0000) | |
d4473757 KB |
1741 | /* stmfd sp!, {..., fp, ip, lr, pc} |
1742 | or | |
1743 | stmfd sp!, {a1, a2, a3, a4} */ | |
c906108c | 1744 | { |
d4473757 | 1745 | int mask = insn & 0xffff; |
ed9a39eb | 1746 | |
4be43953 DJ |
1747 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1748 | break; | |
1749 | ||
94c30b78 | 1750 | /* Calculate offsets of saved registers. */ |
34e8f22d | 1751 | for (regno = ARM_PC_REGNUM; regno >= 0; regno--) |
d4473757 KB |
1752 | if (mask & (1 << regno)) |
1753 | { | |
0963b4bd MS |
1754 | regs[ARM_SP_REGNUM] |
1755 | = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
4be43953 | 1756 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); |
d4473757 KB |
1757 | } |
1758 | } | |
0d39a070 DJ |
1759 | else if ((insn & 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */ |
1760 | || (insn & 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */ | |
f8bf5763 | 1761 | || (insn & 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */ |
b8d5e71d MS |
1762 | { |
1763 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1764 | continue; | |
1765 | } | |
0d39a070 DJ |
1766 | else if ((insn & 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */ |
1767 | || (insn & 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */ | |
f8bf5763 | 1768 | || (insn & 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */ |
f43845b3 MS |
1769 | { |
1770 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1771 | continue; | |
1772 | } | |
0963b4bd MS |
1773 | else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn, |
1774 | { registers } */ | |
0d39a070 DJ |
1775 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
1776 | { | |
1777 | /* No need to add this to saved_regs -- it's just arg regs. */ | |
1778 | continue; | |
1779 | } | |
d4473757 KB |
1780 | else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */ |
1781 | { | |
94c30b78 MS |
1782 | unsigned imm = insn & 0xff; /* immediate value */ |
1783 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1784 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1785 | regs[ARM_FP_REGNUM] = pv_add_constant (regs[ARM_IP_REGNUM], -imm); |
d4473757 KB |
1786 | } |
1787 | else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */ | |
1788 | { | |
94c30b78 MS |
1789 | unsigned imm = insn & 0xff; /* immediate value */ |
1790 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1791 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1792 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm); |
d4473757 | 1793 | } |
0963b4bd MS |
1794 | else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, |
1795 | [sp, -#c]! */ | |
2af46ca0 | 1796 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 | 1797 | { |
4be43953 DJ |
1798 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1799 | break; | |
1800 | ||
1801 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); | |
34e8f22d | 1802 | regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07); |
4be43953 | 1803 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, regs[regno]); |
d4473757 | 1804 | } |
0963b4bd MS |
1805 | else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, |
1806 | [sp!] */ | |
2af46ca0 | 1807 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 KB |
1808 | { |
1809 | int n_saved_fp_regs; | |
1810 | unsigned int fp_start_reg, fp_bound_reg; | |
1811 | ||
4be43953 DJ |
1812 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1813 | break; | |
1814 | ||
94c30b78 | 1815 | if ((insn & 0x800) == 0x800) /* N0 is set */ |
96baa820 | 1816 | { |
d4473757 KB |
1817 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1818 | n_saved_fp_regs = 3; | |
1819 | else | |
1820 | n_saved_fp_regs = 1; | |
96baa820 | 1821 | } |
d4473757 | 1822 | else |
96baa820 | 1823 | { |
d4473757 KB |
1824 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1825 | n_saved_fp_regs = 2; | |
1826 | else | |
1827 | n_saved_fp_regs = 4; | |
96baa820 | 1828 | } |
d4473757 | 1829 | |
34e8f22d | 1830 | fp_start_reg = ARM_F0_REGNUM + ((insn >> 12) & 0x7); |
d4473757 KB |
1831 | fp_bound_reg = fp_start_reg + n_saved_fp_regs; |
1832 | for (; fp_start_reg < fp_bound_reg; fp_start_reg++) | |
96baa820 | 1833 | { |
4be43953 DJ |
1834 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); |
1835 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, | |
1836 | regs[fp_start_reg++]); | |
96baa820 | 1837 | } |
c906108c | 1838 | } |
0d39a070 DJ |
1839 | else if ((insn & 0xff000000) == 0xeb000000 && cache == NULL) /* bl */ |
1840 | { | |
1841 | /* Allow some special function calls when skipping the | |
1842 | prologue; GCC generates these before storing arguments to | |
1843 | the stack. */ | |
1844 | CORE_ADDR dest = BranchDest (current_pc, insn); | |
1845 | ||
e0634ccf | 1846 | if (skip_prologue_function (gdbarch, dest, 0)) |
0d39a070 DJ |
1847 | continue; |
1848 | else | |
1849 | break; | |
1850 | } | |
d4473757 | 1851 | else if ((insn & 0xf0000000) != 0xe0000000) |
0963b4bd | 1852 | break; /* Condition not true, exit early. */ |
0d39a070 DJ |
1853 | else if (arm_instruction_changes_pc (insn)) |
1854 | /* Don't scan past anything that might change control flow. */ | |
1855 | break; | |
d19f7eee UW |
1856 | else if ((insn & 0xfe500000) == 0xe8100000 /* ldm */ |
1857 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1858 | /* Ignore block loads from the stack, potentially copying | |
1859 | parameters from memory. */ | |
1860 | continue; | |
1861 | else if ((insn & 0xfc500000) == 0xe4100000 | |
1862 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1863 | /* Similarly ignore single loads from the stack. */ | |
1864 | continue; | |
0d39a070 DJ |
1865 | else if ((insn & 0xffff0ff0) == 0xe1a00000) |
1866 | /* MOV Rd, Rm. Skip register copies, i.e. saves to another | |
1867 | register instead of the stack. */ | |
d4473757 | 1868 | continue; |
0d39a070 DJ |
1869 | else |
1870 | { | |
1871 | /* The optimizer might shove anything into the prologue, | |
1872 | so we just skip what we don't recognize. */ | |
1873 | unrecognized_pc = current_pc; | |
1874 | continue; | |
1875 | } | |
c906108c SS |
1876 | } |
1877 | ||
0d39a070 DJ |
1878 | if (unrecognized_pc == 0) |
1879 | unrecognized_pc = current_pc; | |
1880 | ||
4be43953 DJ |
1881 | /* The frame size is just the distance from the frame register |
1882 | to the original stack pointer. */ | |
1883 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) | |
1884 | { | |
1885 | /* Frame pointer is fp. */ | |
0d39a070 DJ |
1886 | framereg = ARM_FP_REGNUM; |
1887 | framesize = -regs[ARM_FP_REGNUM].k; | |
4be43953 | 1888 | } |
72a2e3dc | 1889 | else |
4be43953 DJ |
1890 | { |
1891 | /* Try the stack pointer... this is a bit desperate. */ | |
0d39a070 DJ |
1892 | framereg = ARM_SP_REGNUM; |
1893 | framesize = -regs[ARM_SP_REGNUM].k; | |
4be43953 | 1894 | } |
4be43953 | 1895 | |
0d39a070 DJ |
1896 | if (cache) |
1897 | { | |
1898 | cache->framereg = framereg; | |
1899 | cache->framesize = framesize; | |
1900 | ||
1901 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) | |
1902 | if (pv_area_find_reg (stack, gdbarch, regno, &offset)) | |
1903 | cache->saved_regs[regno].addr = offset; | |
1904 | } | |
1905 | ||
1906 | if (arm_debug) | |
1907 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1908 | paddress (gdbarch, unrecognized_pc)); | |
4be43953 DJ |
1909 | |
1910 | do_cleanups (back_to); | |
0d39a070 DJ |
1911 | return unrecognized_pc; |
1912 | } | |
1913 | ||
1914 | static void | |
1915 | arm_scan_prologue (struct frame_info *this_frame, | |
1916 | struct arm_prologue_cache *cache) | |
1917 | { | |
1918 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1919 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1920 | int regno; | |
1921 | CORE_ADDR prologue_start, prologue_end, current_pc; | |
1922 | CORE_ADDR prev_pc = get_frame_pc (this_frame); | |
1923 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
1924 | pv_t regs[ARM_FPS_REGNUM]; | |
1925 | struct pv_area *stack; | |
1926 | struct cleanup *back_to; | |
1927 | CORE_ADDR offset; | |
1928 | ||
1929 | /* Assume there is no frame until proven otherwise. */ | |
1930 | cache->framereg = ARM_SP_REGNUM; | |
1931 | cache->framesize = 0; | |
1932 | ||
1933 | /* Check for Thumb prologue. */ | |
1934 | if (arm_frame_is_thumb (this_frame)) | |
1935 | { | |
1936 | thumb_scan_prologue (gdbarch, prev_pc, block_addr, cache); | |
1937 | return; | |
1938 | } | |
1939 | ||
1940 | /* Find the function prologue. If we can't find the function in | |
1941 | the symbol table, peek in the stack frame to find the PC. */ | |
1942 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, | |
1943 | &prologue_end)) | |
1944 | { | |
1945 | /* One way to find the end of the prologue (which works well | |
1946 | for unoptimized code) is to do the following: | |
1947 | ||
1948 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
1949 | ||
1950 | if (sal.line == 0) | |
1951 | prologue_end = prev_pc; | |
1952 | else if (sal.end < prologue_end) | |
1953 | prologue_end = sal.end; | |
1954 | ||
1955 | This mechanism is very accurate so long as the optimizer | |
1956 | doesn't move any instructions from the function body into the | |
1957 | prologue. If this happens, sal.end will be the last | |
1958 | instruction in the first hunk of prologue code just before | |
1959 | the first instruction that the scheduler has moved from | |
1960 | the body to the prologue. | |
1961 | ||
1962 | In order to make sure that we scan all of the prologue | |
1963 | instructions, we use a slightly less accurate mechanism which | |
1964 | may scan more than necessary. To help compensate for this | |
1965 | lack of accuracy, the prologue scanning loop below contains | |
1966 | several clauses which'll cause the loop to terminate early if | |
1967 | an implausible prologue instruction is encountered. | |
1968 | ||
1969 | The expression | |
1970 | ||
1971 | prologue_start + 64 | |
1972 | ||
1973 | is a suitable endpoint since it accounts for the largest | |
1974 | possible prologue plus up to five instructions inserted by | |
1975 | the scheduler. */ | |
1976 | ||
1977 | if (prologue_end > prologue_start + 64) | |
1978 | { | |
1979 | prologue_end = prologue_start + 64; /* See above. */ | |
1980 | } | |
1981 | } | |
1982 | else | |
1983 | { | |
1984 | /* We have no symbol information. Our only option is to assume this | |
1985 | function has a standard stack frame and the normal frame register. | |
1986 | Then, we can find the value of our frame pointer on entrance to | |
1987 | the callee (or at the present moment if this is the innermost frame). | |
1988 | The value stored there should be the address of the stmfd + 8. */ | |
1989 | CORE_ADDR frame_loc; | |
1990 | LONGEST return_value; | |
1991 | ||
1992 | frame_loc = get_frame_register_unsigned (this_frame, ARM_FP_REGNUM); | |
1993 | if (!safe_read_memory_integer (frame_loc, 4, byte_order, &return_value)) | |
1994 | return; | |
1995 | else | |
1996 | { | |
1997 | prologue_start = gdbarch_addr_bits_remove | |
1998 | (gdbarch, return_value) - 8; | |
1999 | prologue_end = prologue_start + 64; /* See above. */ | |
2000 | } | |
2001 | } | |
2002 | ||
2003 | if (prev_pc < prologue_end) | |
2004 | prologue_end = prev_pc; | |
2005 | ||
2006 | arm_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); | |
c906108c SS |
2007 | } |
2008 | ||
eb5492fa | 2009 | static struct arm_prologue_cache * |
a262aec2 | 2010 | arm_make_prologue_cache (struct frame_info *this_frame) |
c906108c | 2011 | { |
eb5492fa DJ |
2012 | int reg; |
2013 | struct arm_prologue_cache *cache; | |
2014 | CORE_ADDR unwound_fp; | |
c5aa993b | 2015 | |
35d5d4ee | 2016 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2017 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
c906108c | 2018 | |
a262aec2 | 2019 | arm_scan_prologue (this_frame, cache); |
848cfffb | 2020 | |
a262aec2 | 2021 | unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); |
eb5492fa DJ |
2022 | if (unwound_fp == 0) |
2023 | return cache; | |
c906108c | 2024 | |
4be43953 | 2025 | cache->prev_sp = unwound_fp + cache->framesize; |
c906108c | 2026 | |
eb5492fa DJ |
2027 | /* Calculate actual addresses of saved registers using offsets |
2028 | determined by arm_scan_prologue. */ | |
a262aec2 | 2029 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) |
e28a332c | 2030 | if (trad_frame_addr_p (cache->saved_regs, reg)) |
eb5492fa DJ |
2031 | cache->saved_regs[reg].addr += cache->prev_sp; |
2032 | ||
2033 | return cache; | |
c906108c SS |
2034 | } |
2035 | ||
eb5492fa DJ |
2036 | /* Our frame ID for a normal frame is the current function's starting PC |
2037 | and the caller's SP when we were called. */ | |
c906108c | 2038 | |
148754e5 | 2039 | static void |
a262aec2 | 2040 | arm_prologue_this_id (struct frame_info *this_frame, |
eb5492fa DJ |
2041 | void **this_cache, |
2042 | struct frame_id *this_id) | |
c906108c | 2043 | { |
eb5492fa DJ |
2044 | struct arm_prologue_cache *cache; |
2045 | struct frame_id id; | |
2c404490 | 2046 | CORE_ADDR pc, func; |
f079148d | 2047 | |
eb5492fa | 2048 | if (*this_cache == NULL) |
a262aec2 | 2049 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2050 | cache = *this_cache; |
2a451106 | 2051 | |
2c404490 DJ |
2052 | /* This is meant to halt the backtrace at "_start". */ |
2053 | pc = get_frame_pc (this_frame); | |
2054 | if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) | |
eb5492fa | 2055 | return; |
5a203e44 | 2056 | |
eb5492fa DJ |
2057 | /* If we've hit a wall, stop. */ |
2058 | if (cache->prev_sp == 0) | |
2059 | return; | |
24de872b | 2060 | |
0e9e9abd UW |
2061 | /* Use function start address as part of the frame ID. If we cannot |
2062 | identify the start address (due to missing symbol information), | |
2063 | fall back to just using the current PC. */ | |
2c404490 | 2064 | func = get_frame_func (this_frame); |
0e9e9abd UW |
2065 | if (!func) |
2066 | func = pc; | |
2067 | ||
eb5492fa | 2068 | id = frame_id_build (cache->prev_sp, func); |
eb5492fa | 2069 | *this_id = id; |
c906108c SS |
2070 | } |
2071 | ||
a262aec2 DJ |
2072 | static struct value * |
2073 | arm_prologue_prev_register (struct frame_info *this_frame, | |
eb5492fa | 2074 | void **this_cache, |
a262aec2 | 2075 | int prev_regnum) |
24de872b | 2076 | { |
24568a2c | 2077 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
24de872b DJ |
2078 | struct arm_prologue_cache *cache; |
2079 | ||
eb5492fa | 2080 | if (*this_cache == NULL) |
a262aec2 | 2081 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2082 | cache = *this_cache; |
24de872b | 2083 | |
eb5492fa | 2084 | /* If we are asked to unwind the PC, then we need to return the LR |
b39cc962 DJ |
2085 | instead. The prologue may save PC, but it will point into this |
2086 | frame's prologue, not the next frame's resume location. Also | |
2087 | strip the saved T bit. A valid LR may have the low bit set, but | |
2088 | a valid PC never does. */ | |
eb5492fa | 2089 | if (prev_regnum == ARM_PC_REGNUM) |
b39cc962 DJ |
2090 | { |
2091 | CORE_ADDR lr; | |
2092 | ||
2093 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2094 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
24568a2c | 2095 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 | 2096 | } |
24de872b | 2097 | |
eb5492fa | 2098 | /* SP is generally not saved to the stack, but this frame is |
a262aec2 | 2099 | identified by the next frame's stack pointer at the time of the call. |
eb5492fa DJ |
2100 | The value was already reconstructed into PREV_SP. */ |
2101 | if (prev_regnum == ARM_SP_REGNUM) | |
a262aec2 | 2102 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
eb5492fa | 2103 | |
b39cc962 DJ |
2104 | /* The CPSR may have been changed by the call instruction and by the |
2105 | called function. The only bit we can reconstruct is the T bit, | |
2106 | by checking the low bit of LR as of the call. This is a reliable | |
2107 | indicator of Thumb-ness except for some ARM v4T pre-interworking | |
2108 | Thumb code, which could get away with a clear low bit as long as | |
2109 | the called function did not use bx. Guess that all other | |
2110 | bits are unchanged; the condition flags are presumably lost, | |
2111 | but the processor status is likely valid. */ | |
2112 | if (prev_regnum == ARM_PS_REGNUM) | |
2113 | { | |
2114 | CORE_ADDR lr, cpsr; | |
9779414d | 2115 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
2116 | |
2117 | cpsr = get_frame_register_unsigned (this_frame, prev_regnum); | |
2118 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2119 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 2120 | cpsr |= t_bit; |
b39cc962 | 2121 | else |
9779414d | 2122 | cpsr &= ~t_bit; |
b39cc962 DJ |
2123 | return frame_unwind_got_constant (this_frame, prev_regnum, cpsr); |
2124 | } | |
2125 | ||
a262aec2 DJ |
2126 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
2127 | prev_regnum); | |
eb5492fa DJ |
2128 | } |
2129 | ||
2130 | struct frame_unwind arm_prologue_unwind = { | |
2131 | NORMAL_FRAME, | |
8fbca658 | 2132 | default_frame_unwind_stop_reason, |
eb5492fa | 2133 | arm_prologue_this_id, |
a262aec2 DJ |
2134 | arm_prologue_prev_register, |
2135 | NULL, | |
2136 | default_frame_sniffer | |
eb5492fa DJ |
2137 | }; |
2138 | ||
0e9e9abd UW |
2139 | /* Maintain a list of ARM exception table entries per objfile, similar to the |
2140 | list of mapping symbols. We only cache entries for standard ARM-defined | |
2141 | personality routines; the cache will contain only the frame unwinding | |
2142 | instructions associated with the entry (not the descriptors). */ | |
2143 | ||
2144 | static const struct objfile_data *arm_exidx_data_key; | |
2145 | ||
2146 | struct arm_exidx_entry | |
2147 | { | |
2148 | bfd_vma addr; | |
2149 | gdb_byte *entry; | |
2150 | }; | |
2151 | typedef struct arm_exidx_entry arm_exidx_entry_s; | |
2152 | DEF_VEC_O(arm_exidx_entry_s); | |
2153 | ||
2154 | struct arm_exidx_data | |
2155 | { | |
2156 | VEC(arm_exidx_entry_s) **section_maps; | |
2157 | }; | |
2158 | ||
2159 | static void | |
2160 | arm_exidx_data_free (struct objfile *objfile, void *arg) | |
2161 | { | |
2162 | struct arm_exidx_data *data = arg; | |
2163 | unsigned int i; | |
2164 | ||
2165 | for (i = 0; i < objfile->obfd->section_count; i++) | |
2166 | VEC_free (arm_exidx_entry_s, data->section_maps[i]); | |
2167 | } | |
2168 | ||
2169 | static inline int | |
2170 | arm_compare_exidx_entries (const struct arm_exidx_entry *lhs, | |
2171 | const struct arm_exidx_entry *rhs) | |
2172 | { | |
2173 | return lhs->addr < rhs->addr; | |
2174 | } | |
2175 | ||
2176 | static struct obj_section * | |
2177 | arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma) | |
2178 | { | |
2179 | struct obj_section *osect; | |
2180 | ||
2181 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
2182 | if (bfd_get_section_flags (objfile->obfd, | |
2183 | osect->the_bfd_section) & SEC_ALLOC) | |
2184 | { | |
2185 | bfd_vma start, size; | |
2186 | start = bfd_get_section_vma (objfile->obfd, osect->the_bfd_section); | |
2187 | size = bfd_get_section_size (osect->the_bfd_section); | |
2188 | ||
2189 | if (start <= vma && vma < start + size) | |
2190 | return osect; | |
2191 | } | |
2192 | ||
2193 | return NULL; | |
2194 | } | |
2195 | ||
2196 | /* Parse contents of exception table and exception index sections | |
2197 | of OBJFILE, and fill in the exception table entry cache. | |
2198 | ||
2199 | For each entry that refers to a standard ARM-defined personality | |
2200 | routine, extract the frame unwinding instructions (from either | |
2201 | the index or the table section). The unwinding instructions | |
2202 | are normalized by: | |
2203 | - extracting them from the rest of the table data | |
2204 | - converting to host endianness | |
2205 | - appending the implicit 0xb0 ("Finish") code | |
2206 | ||
2207 | The extracted and normalized instructions are stored for later | |
2208 | retrieval by the arm_find_exidx_entry routine. */ | |
2209 | ||
2210 | static void | |
2211 | arm_exidx_new_objfile (struct objfile *objfile) | |
2212 | { | |
3bb47e8b | 2213 | struct cleanup *cleanups; |
0e9e9abd UW |
2214 | struct arm_exidx_data *data; |
2215 | asection *exidx, *extab; | |
2216 | bfd_vma exidx_vma = 0, extab_vma = 0; | |
2217 | bfd_size_type exidx_size = 0, extab_size = 0; | |
2218 | gdb_byte *exidx_data = NULL, *extab_data = NULL; | |
2219 | LONGEST i; | |
2220 | ||
2221 | /* If we've already touched this file, do nothing. */ | |
2222 | if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL) | |
2223 | return; | |
3bb47e8b | 2224 | cleanups = make_cleanup (null_cleanup, NULL); |
0e9e9abd UW |
2225 | |
2226 | /* Read contents of exception table and index. */ | |
2227 | exidx = bfd_get_section_by_name (objfile->obfd, ".ARM.exidx"); | |
2228 | if (exidx) | |
2229 | { | |
2230 | exidx_vma = bfd_section_vma (objfile->obfd, exidx); | |
2231 | exidx_size = bfd_get_section_size (exidx); | |
2232 | exidx_data = xmalloc (exidx_size); | |
2233 | make_cleanup (xfree, exidx_data); | |
2234 | ||
2235 | if (!bfd_get_section_contents (objfile->obfd, exidx, | |
2236 | exidx_data, 0, exidx_size)) | |
2237 | { | |
2238 | do_cleanups (cleanups); | |
2239 | return; | |
2240 | } | |
2241 | } | |
2242 | ||
2243 | extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab"); | |
2244 | if (extab) | |
2245 | { | |
2246 | extab_vma = bfd_section_vma (objfile->obfd, extab); | |
2247 | extab_size = bfd_get_section_size (extab); | |
2248 | extab_data = xmalloc (extab_size); | |
2249 | make_cleanup (xfree, extab_data); | |
2250 | ||
2251 | if (!bfd_get_section_contents (objfile->obfd, extab, | |
2252 | extab_data, 0, extab_size)) | |
2253 | { | |
2254 | do_cleanups (cleanups); | |
2255 | return; | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | /* Allocate exception table data structure. */ | |
2260 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct arm_exidx_data); | |
2261 | set_objfile_data (objfile, arm_exidx_data_key, data); | |
2262 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
2263 | objfile->obfd->section_count, | |
2264 | VEC(arm_exidx_entry_s) *); | |
2265 | ||
2266 | /* Fill in exception table. */ | |
2267 | for (i = 0; i < exidx_size / 8; i++) | |
2268 | { | |
2269 | struct arm_exidx_entry new_exidx_entry; | |
2270 | bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8); | |
2271 | bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4); | |
2272 | bfd_vma addr = 0, word = 0; | |
2273 | int n_bytes = 0, n_words = 0; | |
2274 | struct obj_section *sec; | |
2275 | gdb_byte *entry = NULL; | |
2276 | ||
2277 | /* Extract address of start of function. */ | |
2278 | idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2279 | idx += exidx_vma + i * 8; | |
2280 | ||
2281 | /* Find section containing function and compute section offset. */ | |
2282 | sec = arm_obj_section_from_vma (objfile, idx); | |
2283 | if (sec == NULL) | |
2284 | continue; | |
2285 | idx -= bfd_get_section_vma (objfile->obfd, sec->the_bfd_section); | |
2286 | ||
2287 | /* Determine address of exception table entry. */ | |
2288 | if (val == 1) | |
2289 | { | |
2290 | /* EXIDX_CANTUNWIND -- no exception table entry present. */ | |
2291 | } | |
2292 | else if ((val & 0xff000000) == 0x80000000) | |
2293 | { | |
2294 | /* Exception table entry embedded in .ARM.exidx | |
2295 | -- must be short form. */ | |
2296 | word = val; | |
2297 | n_bytes = 3; | |
2298 | } | |
2299 | else if (!(val & 0x80000000)) | |
2300 | { | |
2301 | /* Exception table entry in .ARM.extab. */ | |
2302 | addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2303 | addr += exidx_vma + i * 8 + 4; | |
2304 | ||
2305 | if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size) | |
2306 | { | |
2307 | word = bfd_h_get_32 (objfile->obfd, | |
2308 | extab_data + addr - extab_vma); | |
2309 | addr += 4; | |
2310 | ||
2311 | if ((word & 0xff000000) == 0x80000000) | |
2312 | { | |
2313 | /* Short form. */ | |
2314 | n_bytes = 3; | |
2315 | } | |
2316 | else if ((word & 0xff000000) == 0x81000000 | |
2317 | || (word & 0xff000000) == 0x82000000) | |
2318 | { | |
2319 | /* Long form. */ | |
2320 | n_bytes = 2; | |
2321 | n_words = ((word >> 16) & 0xff); | |
2322 | } | |
2323 | else if (!(word & 0x80000000)) | |
2324 | { | |
2325 | bfd_vma pers; | |
2326 | struct obj_section *pers_sec; | |
2327 | int gnu_personality = 0; | |
2328 | ||
2329 | /* Custom personality routine. */ | |
2330 | pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2331 | pers = UNMAKE_THUMB_ADDR (pers + addr - 4); | |
2332 | ||
2333 | /* Check whether we've got one of the variants of the | |
2334 | GNU personality routines. */ | |
2335 | pers_sec = arm_obj_section_from_vma (objfile, pers); | |
2336 | if (pers_sec) | |
2337 | { | |
2338 | static const char *personality[] = | |
2339 | { | |
2340 | "__gcc_personality_v0", | |
2341 | "__gxx_personality_v0", | |
2342 | "__gcj_personality_v0", | |
2343 | "__gnu_objc_personality_v0", | |
2344 | NULL | |
2345 | }; | |
2346 | ||
2347 | CORE_ADDR pc = pers + obj_section_offset (pers_sec); | |
2348 | int k; | |
2349 | ||
2350 | for (k = 0; personality[k]; k++) | |
2351 | if (lookup_minimal_symbol_by_pc_name | |
2352 | (pc, personality[k], objfile)) | |
2353 | { | |
2354 | gnu_personality = 1; | |
2355 | break; | |
2356 | } | |
2357 | } | |
2358 | ||
2359 | /* If so, the next word contains a word count in the high | |
2360 | byte, followed by the same unwind instructions as the | |
2361 | pre-defined forms. */ | |
2362 | if (gnu_personality | |
2363 | && addr + 4 <= extab_vma + extab_size) | |
2364 | { | |
2365 | word = bfd_h_get_32 (objfile->obfd, | |
2366 | extab_data + addr - extab_vma); | |
2367 | addr += 4; | |
2368 | n_bytes = 3; | |
2369 | n_words = ((word >> 24) & 0xff); | |
2370 | } | |
2371 | } | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | /* Sanity check address. */ | |
2376 | if (n_words) | |
2377 | if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size) | |
2378 | n_words = n_bytes = 0; | |
2379 | ||
2380 | /* The unwind instructions reside in WORD (only the N_BYTES least | |
2381 | significant bytes are valid), followed by N_WORDS words in the | |
2382 | extab section starting at ADDR. */ | |
2383 | if (n_bytes || n_words) | |
2384 | { | |
2385 | gdb_byte *p = entry = obstack_alloc (&objfile->objfile_obstack, | |
2386 | n_bytes + n_words * 4 + 1); | |
2387 | ||
2388 | while (n_bytes--) | |
2389 | *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff); | |
2390 | ||
2391 | while (n_words--) | |
2392 | { | |
2393 | word = bfd_h_get_32 (objfile->obfd, | |
2394 | extab_data + addr - extab_vma); | |
2395 | addr += 4; | |
2396 | ||
2397 | *p++ = (gdb_byte) ((word >> 24) & 0xff); | |
2398 | *p++ = (gdb_byte) ((word >> 16) & 0xff); | |
2399 | *p++ = (gdb_byte) ((word >> 8) & 0xff); | |
2400 | *p++ = (gdb_byte) (word & 0xff); | |
2401 | } | |
2402 | ||
2403 | /* Implied "Finish" to terminate the list. */ | |
2404 | *p++ = 0xb0; | |
2405 | } | |
2406 | ||
2407 | /* Push entry onto vector. They are guaranteed to always | |
2408 | appear in order of increasing addresses. */ | |
2409 | new_exidx_entry.addr = idx; | |
2410 | new_exidx_entry.entry = entry; | |
2411 | VEC_safe_push (arm_exidx_entry_s, | |
2412 | data->section_maps[sec->the_bfd_section->index], | |
2413 | &new_exidx_entry); | |
2414 | } | |
2415 | ||
2416 | do_cleanups (cleanups); | |
2417 | } | |
2418 | ||
2419 | /* Search for the exception table entry covering MEMADDR. If one is found, | |
2420 | return a pointer to its data. Otherwise, return 0. If START is non-NULL, | |
2421 | set *START to the start of the region covered by this entry. */ | |
2422 | ||
2423 | static gdb_byte * | |
2424 | arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start) | |
2425 | { | |
2426 | struct obj_section *sec; | |
2427 | ||
2428 | sec = find_pc_section (memaddr); | |
2429 | if (sec != NULL) | |
2430 | { | |
2431 | struct arm_exidx_data *data; | |
2432 | VEC(arm_exidx_entry_s) *map; | |
2433 | struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 }; | |
2434 | unsigned int idx; | |
2435 | ||
2436 | data = objfile_data (sec->objfile, arm_exidx_data_key); | |
2437 | if (data != NULL) | |
2438 | { | |
2439 | map = data->section_maps[sec->the_bfd_section->index]; | |
2440 | if (!VEC_empty (arm_exidx_entry_s, map)) | |
2441 | { | |
2442 | struct arm_exidx_entry *map_sym; | |
2443 | ||
2444 | idx = VEC_lower_bound (arm_exidx_entry_s, map, &map_key, | |
2445 | arm_compare_exidx_entries); | |
2446 | ||
2447 | /* VEC_lower_bound finds the earliest ordered insertion | |
2448 | point. If the following symbol starts at this exact | |
2449 | address, we use that; otherwise, the preceding | |
2450 | exception table entry covers this address. */ | |
2451 | if (idx < VEC_length (arm_exidx_entry_s, map)) | |
2452 | { | |
2453 | map_sym = VEC_index (arm_exidx_entry_s, map, idx); | |
2454 | if (map_sym->addr == map_key.addr) | |
2455 | { | |
2456 | if (start) | |
2457 | *start = map_sym->addr + obj_section_addr (sec); | |
2458 | return map_sym->entry; | |
2459 | } | |
2460 | } | |
2461 | ||
2462 | if (idx > 0) | |
2463 | { | |
2464 | map_sym = VEC_index (arm_exidx_entry_s, map, idx - 1); | |
2465 | if (start) | |
2466 | *start = map_sym->addr + obj_section_addr (sec); | |
2467 | return map_sym->entry; | |
2468 | } | |
2469 | } | |
2470 | } | |
2471 | } | |
2472 | ||
2473 | return NULL; | |
2474 | } | |
2475 | ||
2476 | /* Given the current frame THIS_FRAME, and its associated frame unwinding | |
2477 | instruction list from the ARM exception table entry ENTRY, allocate and | |
2478 | return a prologue cache structure describing how to unwind this frame. | |
2479 | ||
2480 | Return NULL if the unwinding instruction list contains a "spare", | |
2481 | "reserved" or "refuse to unwind" instruction as defined in section | |
2482 | "9.3 Frame unwinding instructions" of the "Exception Handling ABI | |
2483 | for the ARM Architecture" document. */ | |
2484 | ||
2485 | static struct arm_prologue_cache * | |
2486 | arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry) | |
2487 | { | |
2488 | CORE_ADDR vsp = 0; | |
2489 | int vsp_valid = 0; | |
2490 | ||
2491 | struct arm_prologue_cache *cache; | |
2492 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2493 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2494 | ||
2495 | for (;;) | |
2496 | { | |
2497 | gdb_byte insn; | |
2498 | ||
2499 | /* Whenever we reload SP, we actually have to retrieve its | |
2500 | actual value in the current frame. */ | |
2501 | if (!vsp_valid) | |
2502 | { | |
2503 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2504 | { | |
2505 | int reg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2506 | vsp = get_frame_register_unsigned (this_frame, reg); | |
2507 | } | |
2508 | else | |
2509 | { | |
2510 | CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr; | |
2511 | vsp = get_frame_memory_unsigned (this_frame, addr, 4); | |
2512 | } | |
2513 | ||
2514 | vsp_valid = 1; | |
2515 | } | |
2516 | ||
2517 | /* Decode next unwind instruction. */ | |
2518 | insn = *entry++; | |
2519 | ||
2520 | if ((insn & 0xc0) == 0) | |
2521 | { | |
2522 | int offset = insn & 0x3f; | |
2523 | vsp += (offset << 2) + 4; | |
2524 | } | |
2525 | else if ((insn & 0xc0) == 0x40) | |
2526 | { | |
2527 | int offset = insn & 0x3f; | |
2528 | vsp -= (offset << 2) + 4; | |
2529 | } | |
2530 | else if ((insn & 0xf0) == 0x80) | |
2531 | { | |
2532 | int mask = ((insn & 0xf) << 8) | *entry++; | |
2533 | int i; | |
2534 | ||
2535 | /* The special case of an all-zero mask identifies | |
2536 | "Refuse to unwind". We return NULL to fall back | |
2537 | to the prologue analyzer. */ | |
2538 | if (mask == 0) | |
2539 | return NULL; | |
2540 | ||
2541 | /* Pop registers r4..r15 under mask. */ | |
2542 | for (i = 0; i < 12; i++) | |
2543 | if (mask & (1 << i)) | |
2544 | { | |
2545 | cache->saved_regs[4 + i].addr = vsp; | |
2546 | vsp += 4; | |
2547 | } | |
2548 | ||
2549 | /* Special-case popping SP -- we need to reload vsp. */ | |
2550 | if (mask & (1 << (ARM_SP_REGNUM - 4))) | |
2551 | vsp_valid = 0; | |
2552 | } | |
2553 | else if ((insn & 0xf0) == 0x90) | |
2554 | { | |
2555 | int reg = insn & 0xf; | |
2556 | ||
2557 | /* Reserved cases. */ | |
2558 | if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM) | |
2559 | return NULL; | |
2560 | ||
2561 | /* Set SP from another register and mark VSP for reload. */ | |
2562 | cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg]; | |
2563 | vsp_valid = 0; | |
2564 | } | |
2565 | else if ((insn & 0xf0) == 0xa0) | |
2566 | { | |
2567 | int count = insn & 0x7; | |
2568 | int pop_lr = (insn & 0x8) != 0; | |
2569 | int i; | |
2570 | ||
2571 | /* Pop r4..r[4+count]. */ | |
2572 | for (i = 0; i <= count; i++) | |
2573 | { | |
2574 | cache->saved_regs[4 + i].addr = vsp; | |
2575 | vsp += 4; | |
2576 | } | |
2577 | ||
2578 | /* If indicated by flag, pop LR as well. */ | |
2579 | if (pop_lr) | |
2580 | { | |
2581 | cache->saved_regs[ARM_LR_REGNUM].addr = vsp; | |
2582 | vsp += 4; | |
2583 | } | |
2584 | } | |
2585 | else if (insn == 0xb0) | |
2586 | { | |
2587 | /* We could only have updated PC by popping into it; if so, it | |
2588 | will show up as address. Otherwise, copy LR into PC. */ | |
2589 | if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM)) | |
2590 | cache->saved_regs[ARM_PC_REGNUM] | |
2591 | = cache->saved_regs[ARM_LR_REGNUM]; | |
2592 | ||
2593 | /* We're done. */ | |
2594 | break; | |
2595 | } | |
2596 | else if (insn == 0xb1) | |
2597 | { | |
2598 | int mask = *entry++; | |
2599 | int i; | |
2600 | ||
2601 | /* All-zero mask and mask >= 16 is "spare". */ | |
2602 | if (mask == 0 || mask >= 16) | |
2603 | return NULL; | |
2604 | ||
2605 | /* Pop r0..r3 under mask. */ | |
2606 | for (i = 0; i < 4; i++) | |
2607 | if (mask & (1 << i)) | |
2608 | { | |
2609 | cache->saved_regs[i].addr = vsp; | |
2610 | vsp += 4; | |
2611 | } | |
2612 | } | |
2613 | else if (insn == 0xb2) | |
2614 | { | |
2615 | ULONGEST offset = 0; | |
2616 | unsigned shift = 0; | |
2617 | ||
2618 | do | |
2619 | { | |
2620 | offset |= (*entry & 0x7f) << shift; | |
2621 | shift += 7; | |
2622 | } | |
2623 | while (*entry++ & 0x80); | |
2624 | ||
2625 | vsp += 0x204 + (offset << 2); | |
2626 | } | |
2627 | else if (insn == 0xb3) | |
2628 | { | |
2629 | int start = *entry >> 4; | |
2630 | int count = (*entry++) & 0xf; | |
2631 | int i; | |
2632 | ||
2633 | /* Only registers D0..D15 are valid here. */ | |
2634 | if (start + count >= 16) | |
2635 | return NULL; | |
2636 | ||
2637 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2638 | for (i = 0; i <= count; i++) | |
2639 | { | |
2640 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2641 | vsp += 8; | |
2642 | } | |
2643 | ||
2644 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2645 | vsp += 4; | |
2646 | } | |
2647 | else if ((insn & 0xf8) == 0xb8) | |
2648 | { | |
2649 | int count = insn & 0x7; | |
2650 | int i; | |
2651 | ||
2652 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2653 | for (i = 0; i <= count; i++) | |
2654 | { | |
2655 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2656 | vsp += 8; | |
2657 | } | |
2658 | ||
2659 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2660 | vsp += 4; | |
2661 | } | |
2662 | else if (insn == 0xc6) | |
2663 | { | |
2664 | int start = *entry >> 4; | |
2665 | int count = (*entry++) & 0xf; | |
2666 | int i; | |
2667 | ||
2668 | /* Only registers WR0..WR15 are valid. */ | |
2669 | if (start + count >= 16) | |
2670 | return NULL; | |
2671 | ||
2672 | /* Pop iwmmx registers WR[start]..WR[start+count]. */ | |
2673 | for (i = 0; i <= count; i++) | |
2674 | { | |
2675 | cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp; | |
2676 | vsp += 8; | |
2677 | } | |
2678 | } | |
2679 | else if (insn == 0xc7) | |
2680 | { | |
2681 | int mask = *entry++; | |
2682 | int i; | |
2683 | ||
2684 | /* All-zero mask and mask >= 16 is "spare". */ | |
2685 | if (mask == 0 || mask >= 16) | |
2686 | return NULL; | |
2687 | ||
2688 | /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */ | |
2689 | for (i = 0; i < 4; i++) | |
2690 | if (mask & (1 << i)) | |
2691 | { | |
2692 | cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp; | |
2693 | vsp += 4; | |
2694 | } | |
2695 | } | |
2696 | else if ((insn & 0xf8) == 0xc0) | |
2697 | { | |
2698 | int count = insn & 0x7; | |
2699 | int i; | |
2700 | ||
2701 | /* Pop iwmmx registers WR[10]..WR[10+count]. */ | |
2702 | for (i = 0; i <= count; i++) | |
2703 | { | |
2704 | cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp; | |
2705 | vsp += 8; | |
2706 | } | |
2707 | } | |
2708 | else if (insn == 0xc8) | |
2709 | { | |
2710 | int start = *entry >> 4; | |
2711 | int count = (*entry++) & 0xf; | |
2712 | int i; | |
2713 | ||
2714 | /* Only registers D0..D31 are valid. */ | |
2715 | if (start + count >= 16) | |
2716 | return NULL; | |
2717 | ||
2718 | /* Pop VFP double-precision registers | |
2719 | D[16+start]..D[16+start+count]. */ | |
2720 | for (i = 0; i <= count; i++) | |
2721 | { | |
2722 | cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp; | |
2723 | vsp += 8; | |
2724 | } | |
2725 | } | |
2726 | else if (insn == 0xc9) | |
2727 | { | |
2728 | int start = *entry >> 4; | |
2729 | int count = (*entry++) & 0xf; | |
2730 | int i; | |
2731 | ||
2732 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2733 | for (i = 0; i <= count; i++) | |
2734 | { | |
2735 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2736 | vsp += 8; | |
2737 | } | |
2738 | } | |
2739 | else if ((insn & 0xf8) == 0xd0) | |
2740 | { | |
2741 | int count = insn & 0x7; | |
2742 | int i; | |
2743 | ||
2744 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2745 | for (i = 0; i <= count; i++) | |
2746 | { | |
2747 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2748 | vsp += 8; | |
2749 | } | |
2750 | } | |
2751 | else | |
2752 | { | |
2753 | /* Everything else is "spare". */ | |
2754 | return NULL; | |
2755 | } | |
2756 | } | |
2757 | ||
2758 | /* If we restore SP from a register, assume this was the frame register. | |
2759 | Otherwise just fall back to SP as frame register. */ | |
2760 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2761 | cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2762 | else | |
2763 | cache->framereg = ARM_SP_REGNUM; | |
2764 | ||
2765 | /* Determine offset to previous frame. */ | |
2766 | cache->framesize | |
2767 | = vsp - get_frame_register_unsigned (this_frame, cache->framereg); | |
2768 | ||
2769 | /* We already got the previous SP. */ | |
2770 | cache->prev_sp = vsp; | |
2771 | ||
2772 | return cache; | |
2773 | } | |
2774 | ||
2775 | /* Unwinding via ARM exception table entries. Note that the sniffer | |
2776 | already computes a filled-in prologue cache, which is then used | |
2777 | with the same arm_prologue_this_id and arm_prologue_prev_register | |
2778 | routines also used for prologue-parsing based unwinding. */ | |
2779 | ||
2780 | static int | |
2781 | arm_exidx_unwind_sniffer (const struct frame_unwind *self, | |
2782 | struct frame_info *this_frame, | |
2783 | void **this_prologue_cache) | |
2784 | { | |
2785 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2786 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
2787 | CORE_ADDR addr_in_block, exidx_region, func_start; | |
2788 | struct arm_prologue_cache *cache; | |
2789 | gdb_byte *entry; | |
2790 | ||
2791 | /* See if we have an ARM exception table entry covering this address. */ | |
2792 | addr_in_block = get_frame_address_in_block (this_frame); | |
2793 | entry = arm_find_exidx_entry (addr_in_block, &exidx_region); | |
2794 | if (!entry) | |
2795 | return 0; | |
2796 | ||
2797 | /* The ARM exception table does not describe unwind information | |
2798 | for arbitrary PC values, but is guaranteed to be correct only | |
2799 | at call sites. We have to decide here whether we want to use | |
2800 | ARM exception table information for this frame, or fall back | |
2801 | to using prologue parsing. (Note that if we have DWARF CFI, | |
2802 | this sniffer isn't even called -- CFI is always preferred.) | |
2803 | ||
2804 | Before we make this decision, however, we check whether we | |
2805 | actually have *symbol* information for the current frame. | |
2806 | If not, prologue parsing would not work anyway, so we might | |
2807 | as well use the exception table and hope for the best. */ | |
2808 | if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL)) | |
2809 | { | |
2810 | int exc_valid = 0; | |
2811 | ||
2812 | /* If the next frame is "normal", we are at a call site in this | |
2813 | frame, so exception information is guaranteed to be valid. */ | |
2814 | if (get_next_frame (this_frame) | |
2815 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) | |
2816 | exc_valid = 1; | |
2817 | ||
2818 | /* We also assume exception information is valid if we're currently | |
2819 | blocked in a system call. The system library is supposed to | |
2820 | ensure this, so that e.g. pthread cancellation works. */ | |
2821 | if (arm_frame_is_thumb (this_frame)) | |
2822 | { | |
2823 | LONGEST insn; | |
2824 | ||
2825 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 2, 2, | |
2826 | byte_order_for_code, &insn) | |
2827 | && (insn & 0xff00) == 0xdf00 /* svc */) | |
2828 | exc_valid = 1; | |
2829 | } | |
2830 | else | |
2831 | { | |
2832 | LONGEST insn; | |
2833 | ||
2834 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 4, 4, | |
2835 | byte_order_for_code, &insn) | |
2836 | && (insn & 0x0f000000) == 0x0f000000 /* svc */) | |
2837 | exc_valid = 1; | |
2838 | } | |
2839 | ||
2840 | /* Bail out if we don't know that exception information is valid. */ | |
2841 | if (!exc_valid) | |
2842 | return 0; | |
2843 | ||
2844 | /* The ARM exception index does not mark the *end* of the region | |
2845 | covered by the entry, and some functions will not have any entry. | |
2846 | To correctly recognize the end of the covered region, the linker | |
2847 | should have inserted dummy records with a CANTUNWIND marker. | |
2848 | ||
2849 | Unfortunately, current versions of GNU ld do not reliably do | |
2850 | this, and thus we may have found an incorrect entry above. | |
2851 | As a (temporary) sanity check, we only use the entry if it | |
2852 | lies *within* the bounds of the function. Note that this check | |
2853 | might reject perfectly valid entries that just happen to cover | |
2854 | multiple functions; therefore this check ought to be removed | |
2855 | once the linker is fixed. */ | |
2856 | if (func_start > exidx_region) | |
2857 | return 0; | |
2858 | } | |
2859 | ||
2860 | /* Decode the list of unwinding instructions into a prologue cache. | |
2861 | Note that this may fail due to e.g. a "refuse to unwind" code. */ | |
2862 | cache = arm_exidx_fill_cache (this_frame, entry); | |
2863 | if (!cache) | |
2864 | return 0; | |
2865 | ||
2866 | *this_prologue_cache = cache; | |
2867 | return 1; | |
2868 | } | |
2869 | ||
2870 | struct frame_unwind arm_exidx_unwind = { | |
2871 | NORMAL_FRAME, | |
8fbca658 | 2872 | default_frame_unwind_stop_reason, |
0e9e9abd UW |
2873 | arm_prologue_this_id, |
2874 | arm_prologue_prev_register, | |
2875 | NULL, | |
2876 | arm_exidx_unwind_sniffer | |
2877 | }; | |
2878 | ||
80d8d390 YQ |
2879 | /* Recognize GCC's trampoline for thumb call-indirect. If we are in a |
2880 | trampoline, return the target PC. Otherwise return 0. | |
2881 | ||
2882 | void call0a (char c, short s, int i, long l) {} | |
2883 | ||
2884 | int main (void) | |
2885 | { | |
2886 | (*pointer_to_call0a) (c, s, i, l); | |
2887 | } | |
2888 | ||
2889 | Instead of calling a stub library function _call_via_xx (xx is | |
2890 | the register name), GCC may inline the trampoline in the object | |
2891 | file as below (register r2 has the address of call0a). | |
2892 | ||
2893 | .global main | |
2894 | .type main, %function | |
2895 | ... | |
2896 | bl .L1 | |
2897 | ... | |
2898 | .size main, .-main | |
2899 | ||
2900 | .L1: | |
2901 | bx r2 | |
2902 | ||
2903 | The trampoline 'bx r2' doesn't belong to main. */ | |
2904 | ||
2905 | static CORE_ADDR | |
2906 | arm_skip_bx_reg (struct frame_info *frame, CORE_ADDR pc) | |
2907 | { | |
2908 | /* The heuristics of recognizing such trampoline is that FRAME is | |
2909 | executing in Thumb mode and the instruction on PC is 'bx Rm'. */ | |
2910 | if (arm_frame_is_thumb (frame)) | |
2911 | { | |
2912 | gdb_byte buf[2]; | |
2913 | ||
2914 | if (target_read_memory (pc, buf, 2) == 0) | |
2915 | { | |
2916 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
2917 | enum bfd_endian byte_order_for_code | |
2918 | = gdbarch_byte_order_for_code (gdbarch); | |
2919 | uint16_t insn | |
2920 | = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
2921 | ||
2922 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
2923 | { | |
2924 | CORE_ADDR dest | |
2925 | = get_frame_register_unsigned (frame, bits (insn, 3, 6)); | |
2926 | ||
2927 | /* Clear the LSB so that gdb core sets step-resume | |
2928 | breakpoint at the right address. */ | |
2929 | return UNMAKE_THUMB_ADDR (dest); | |
2930 | } | |
2931 | } | |
2932 | } | |
2933 | ||
2934 | return 0; | |
2935 | } | |
2936 | ||
909cf6ea | 2937 | static struct arm_prologue_cache * |
a262aec2 | 2938 | arm_make_stub_cache (struct frame_info *this_frame) |
909cf6ea | 2939 | { |
909cf6ea | 2940 | struct arm_prologue_cache *cache; |
909cf6ea | 2941 | |
35d5d4ee | 2942 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2943 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
909cf6ea | 2944 | |
a262aec2 | 2945 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); |
909cf6ea DJ |
2946 | |
2947 | return cache; | |
2948 | } | |
2949 | ||
2950 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2951 | ||
2952 | static void | |
a262aec2 | 2953 | arm_stub_this_id (struct frame_info *this_frame, |
909cf6ea DJ |
2954 | void **this_cache, |
2955 | struct frame_id *this_id) | |
2956 | { | |
2957 | struct arm_prologue_cache *cache; | |
2958 | ||
2959 | if (*this_cache == NULL) | |
a262aec2 | 2960 | *this_cache = arm_make_stub_cache (this_frame); |
909cf6ea DJ |
2961 | cache = *this_cache; |
2962 | ||
a262aec2 | 2963 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
909cf6ea DJ |
2964 | } |
2965 | ||
a262aec2 DJ |
2966 | static int |
2967 | arm_stub_unwind_sniffer (const struct frame_unwind *self, | |
2968 | struct frame_info *this_frame, | |
2969 | void **this_prologue_cache) | |
909cf6ea | 2970 | { |
93d42b30 | 2971 | CORE_ADDR addr_in_block; |
948f8e3d | 2972 | gdb_byte dummy[4]; |
18d18ac8 YQ |
2973 | CORE_ADDR pc, start_addr; |
2974 | const char *name; | |
909cf6ea | 2975 | |
a262aec2 | 2976 | addr_in_block = get_frame_address_in_block (this_frame); |
18d18ac8 | 2977 | pc = get_frame_pc (this_frame); |
3e5d3a5a | 2978 | if (in_plt_section (addr_in_block) |
fc36e839 DE |
2979 | /* We also use the stub winder if the target memory is unreadable |
2980 | to avoid having the prologue unwinder trying to read it. */ | |
18d18ac8 YQ |
2981 | || target_read_memory (pc, dummy, 4) != 0) |
2982 | return 1; | |
2983 | ||
2984 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0 | |
2985 | && arm_skip_bx_reg (this_frame, pc) != 0) | |
a262aec2 | 2986 | return 1; |
909cf6ea | 2987 | |
a262aec2 | 2988 | return 0; |
909cf6ea DJ |
2989 | } |
2990 | ||
a262aec2 DJ |
2991 | struct frame_unwind arm_stub_unwind = { |
2992 | NORMAL_FRAME, | |
8fbca658 | 2993 | default_frame_unwind_stop_reason, |
a262aec2 DJ |
2994 | arm_stub_this_id, |
2995 | arm_prologue_prev_register, | |
2996 | NULL, | |
2997 | arm_stub_unwind_sniffer | |
2998 | }; | |
2999 | ||
2ae28aa9 YQ |
3000 | /* Put here the code to store, into CACHE->saved_regs, the addresses |
3001 | of the saved registers of frame described by THIS_FRAME. CACHE is | |
3002 | returned. */ | |
3003 | ||
3004 | static struct arm_prologue_cache * | |
3005 | arm_m_exception_cache (struct frame_info *this_frame) | |
3006 | { | |
3007 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
3008 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
3009 | struct arm_prologue_cache *cache; | |
3010 | CORE_ADDR unwound_sp; | |
3011 | LONGEST xpsr; | |
3012 | ||
3013 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
3014 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
3015 | ||
3016 | unwound_sp = get_frame_register_unsigned (this_frame, | |
3017 | ARM_SP_REGNUM); | |
3018 | ||
3019 | /* The hardware saves eight 32-bit words, comprising xPSR, | |
3020 | ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in | |
3021 | "B1.5.6 Exception entry behavior" in | |
3022 | "ARMv7-M Architecture Reference Manual". */ | |
3023 | cache->saved_regs[0].addr = unwound_sp; | |
3024 | cache->saved_regs[1].addr = unwound_sp + 4; | |
3025 | cache->saved_regs[2].addr = unwound_sp + 8; | |
3026 | cache->saved_regs[3].addr = unwound_sp + 12; | |
3027 | cache->saved_regs[12].addr = unwound_sp + 16; | |
3028 | cache->saved_regs[14].addr = unwound_sp + 20; | |
3029 | cache->saved_regs[15].addr = unwound_sp + 24; | |
3030 | cache->saved_regs[ARM_PS_REGNUM].addr = unwound_sp + 28; | |
3031 | ||
3032 | /* If bit 9 of the saved xPSR is set, then there is a four-byte | |
3033 | aligner between the top of the 32-byte stack frame and the | |
3034 | previous context's stack pointer. */ | |
3035 | cache->prev_sp = unwound_sp + 32; | |
3036 | if (safe_read_memory_integer (unwound_sp + 28, 4, byte_order, &xpsr) | |
3037 | && (xpsr & (1 << 9)) != 0) | |
3038 | cache->prev_sp += 4; | |
3039 | ||
3040 | return cache; | |
3041 | } | |
3042 | ||
3043 | /* Implementation of function hook 'this_id' in | |
3044 | 'struct frame_uwnind'. */ | |
3045 | ||
3046 | static void | |
3047 | arm_m_exception_this_id (struct frame_info *this_frame, | |
3048 | void **this_cache, | |
3049 | struct frame_id *this_id) | |
3050 | { | |
3051 | struct arm_prologue_cache *cache; | |
3052 | ||
3053 | if (*this_cache == NULL) | |
3054 | *this_cache = arm_m_exception_cache (this_frame); | |
3055 | cache = *this_cache; | |
3056 | ||
3057 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
3058 | *this_id = frame_id_build (cache->prev_sp, | |
3059 | get_frame_pc (this_frame)); | |
3060 | } | |
3061 | ||
3062 | /* Implementation of function hook 'prev_register' in | |
3063 | 'struct frame_uwnind'. */ | |
3064 | ||
3065 | static struct value * | |
3066 | arm_m_exception_prev_register (struct frame_info *this_frame, | |
3067 | void **this_cache, | |
3068 | int prev_regnum) | |
3069 | { | |
3070 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
3071 | struct arm_prologue_cache *cache; | |
3072 | ||
3073 | if (*this_cache == NULL) | |
3074 | *this_cache = arm_m_exception_cache (this_frame); | |
3075 | cache = *this_cache; | |
3076 | ||
3077 | /* The value was already reconstructed into PREV_SP. */ | |
3078 | if (prev_regnum == ARM_SP_REGNUM) | |
3079 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
3080 | cache->prev_sp); | |
3081 | ||
3082 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, | |
3083 | prev_regnum); | |
3084 | } | |
3085 | ||
3086 | /* Implementation of function hook 'sniffer' in | |
3087 | 'struct frame_uwnind'. */ | |
3088 | ||
3089 | static int | |
3090 | arm_m_exception_unwind_sniffer (const struct frame_unwind *self, | |
3091 | struct frame_info *this_frame, | |
3092 | void **this_prologue_cache) | |
3093 | { | |
3094 | CORE_ADDR this_pc = get_frame_pc (this_frame); | |
3095 | ||
3096 | /* No need to check is_m; this sniffer is only registered for | |
3097 | M-profile architectures. */ | |
3098 | ||
3099 | /* Exception frames return to one of these magic PCs. Other values | |
3100 | are not defined as of v7-M. See details in "B1.5.8 Exception | |
3101 | return behavior" in "ARMv7-M Architecture Reference Manual". */ | |
3102 | if (this_pc == 0xfffffff1 || this_pc == 0xfffffff9 | |
3103 | || this_pc == 0xfffffffd) | |
3104 | return 1; | |
3105 | ||
3106 | return 0; | |
3107 | } | |
3108 | ||
3109 | /* Frame unwinder for M-profile exceptions. */ | |
3110 | ||
3111 | struct frame_unwind arm_m_exception_unwind = | |
3112 | { | |
3113 | SIGTRAMP_FRAME, | |
3114 | default_frame_unwind_stop_reason, | |
3115 | arm_m_exception_this_id, | |
3116 | arm_m_exception_prev_register, | |
3117 | NULL, | |
3118 | arm_m_exception_unwind_sniffer | |
3119 | }; | |
3120 | ||
24de872b | 3121 | static CORE_ADDR |
a262aec2 | 3122 | arm_normal_frame_base (struct frame_info *this_frame, void **this_cache) |
24de872b DJ |
3123 | { |
3124 | struct arm_prologue_cache *cache; | |
3125 | ||
eb5492fa | 3126 | if (*this_cache == NULL) |
a262aec2 | 3127 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa DJ |
3128 | cache = *this_cache; |
3129 | ||
4be43953 | 3130 | return cache->prev_sp - cache->framesize; |
24de872b DJ |
3131 | } |
3132 | ||
eb5492fa DJ |
3133 | struct frame_base arm_normal_base = { |
3134 | &arm_prologue_unwind, | |
3135 | arm_normal_frame_base, | |
3136 | arm_normal_frame_base, | |
3137 | arm_normal_frame_base | |
3138 | }; | |
3139 | ||
a262aec2 | 3140 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that |
eb5492fa DJ |
3141 | dummy frame. The frame ID's base needs to match the TOS value |
3142 | saved by save_dummy_frame_tos() and returned from | |
3143 | arm_push_dummy_call, and the PC needs to match the dummy frame's | |
3144 | breakpoint. */ | |
c906108c | 3145 | |
eb5492fa | 3146 | static struct frame_id |
a262aec2 | 3147 | arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
c906108c | 3148 | { |
0963b4bd MS |
3149 | return frame_id_build (get_frame_register_unsigned (this_frame, |
3150 | ARM_SP_REGNUM), | |
a262aec2 | 3151 | get_frame_pc (this_frame)); |
eb5492fa | 3152 | } |
c3b4394c | 3153 | |
eb5492fa DJ |
3154 | /* Given THIS_FRAME, find the previous frame's resume PC (which will |
3155 | be used to construct the previous frame's ID, after looking up the | |
3156 | containing function). */ | |
c3b4394c | 3157 | |
eb5492fa DJ |
3158 | static CORE_ADDR |
3159 | arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
3160 | { | |
3161 | CORE_ADDR pc; | |
3162 | pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM); | |
24568a2c | 3163 | return arm_addr_bits_remove (gdbarch, pc); |
eb5492fa DJ |
3164 | } |
3165 | ||
3166 | static CORE_ADDR | |
3167 | arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
3168 | { | |
3169 | return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM); | |
c906108c SS |
3170 | } |
3171 | ||
b39cc962 DJ |
3172 | static struct value * |
3173 | arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, | |
3174 | int regnum) | |
3175 | { | |
24568a2c | 3176 | struct gdbarch * gdbarch = get_frame_arch (this_frame); |
b39cc962 | 3177 | CORE_ADDR lr, cpsr; |
9779414d | 3178 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
3179 | |
3180 | switch (regnum) | |
3181 | { | |
3182 | case ARM_PC_REGNUM: | |
3183 | /* The PC is normally copied from the return column, which | |
3184 | describes saves of LR. However, that version may have an | |
3185 | extra bit set to indicate Thumb state. The bit is not | |
3186 | part of the PC. */ | |
3187 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
3188 | return frame_unwind_got_constant (this_frame, regnum, | |
24568a2c | 3189 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 DJ |
3190 | |
3191 | case ARM_PS_REGNUM: | |
3192 | /* Reconstruct the T bit; see arm_prologue_prev_register for details. */ | |
ca38c58e | 3193 | cpsr = get_frame_register_unsigned (this_frame, regnum); |
b39cc962 DJ |
3194 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
3195 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 3196 | cpsr |= t_bit; |
b39cc962 | 3197 | else |
9779414d | 3198 | cpsr &= ~t_bit; |
ca38c58e | 3199 | return frame_unwind_got_constant (this_frame, regnum, cpsr); |
b39cc962 DJ |
3200 | |
3201 | default: | |
3202 | internal_error (__FILE__, __LINE__, | |
3203 | _("Unexpected register %d"), regnum); | |
3204 | } | |
3205 | } | |
3206 | ||
3207 | static void | |
3208 | arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
3209 | struct dwarf2_frame_state_reg *reg, | |
3210 | struct frame_info *this_frame) | |
3211 | { | |
3212 | switch (regnum) | |
3213 | { | |
3214 | case ARM_PC_REGNUM: | |
3215 | case ARM_PS_REGNUM: | |
3216 | reg->how = DWARF2_FRAME_REG_FN; | |
3217 | reg->loc.fn = arm_dwarf2_prev_register; | |
3218 | break; | |
3219 | case ARM_SP_REGNUM: | |
3220 | reg->how = DWARF2_FRAME_REG_CFA; | |
3221 | break; | |
3222 | } | |
3223 | } | |
3224 | ||
4024ca99 UW |
3225 | /* Return true if we are in the function's epilogue, i.e. after the |
3226 | instruction that destroyed the function's stack frame. */ | |
3227 | ||
3228 | static int | |
3229 | thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3230 | { | |
3231 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3232 | unsigned int insn, insn2; | |
3233 | int found_return = 0, found_stack_adjust = 0; | |
3234 | CORE_ADDR func_start, func_end; | |
3235 | CORE_ADDR scan_pc; | |
3236 | gdb_byte buf[4]; | |
3237 | ||
3238 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3239 | return 0; | |
3240 | ||
3241 | /* The epilogue is a sequence of instructions along the following lines: | |
3242 | ||
3243 | - add stack frame size to SP or FP | |
3244 | - [if frame pointer used] restore SP from FP | |
3245 | - restore registers from SP [may include PC] | |
3246 | - a return-type instruction [if PC wasn't already restored] | |
3247 | ||
3248 | In a first pass, we scan forward from the current PC and verify the | |
3249 | instructions we find as compatible with this sequence, ending in a | |
3250 | return instruction. | |
3251 | ||
3252 | However, this is not sufficient to distinguish indirect function calls | |
3253 | within a function from indirect tail calls in the epilogue in some cases. | |
3254 | Therefore, if we didn't already find any SP-changing instruction during | |
3255 | forward scan, we add a backward scanning heuristic to ensure we actually | |
3256 | are in the epilogue. */ | |
3257 | ||
3258 | scan_pc = pc; | |
3259 | while (scan_pc < func_end && !found_return) | |
3260 | { | |
3261 | if (target_read_memory (scan_pc, buf, 2)) | |
3262 | break; | |
3263 | ||
3264 | scan_pc += 2; | |
3265 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3266 | ||
3267 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
3268 | found_return = 1; | |
3269 | else if (insn == 0x46f7) /* mov pc, lr */ | |
3270 | found_return = 1; | |
540314bd | 3271 | else if (thumb_instruction_restores_sp (insn)) |
4024ca99 UW |
3272 | { |
3273 | found_stack_adjust = 1; | |
540314bd | 3274 | if ((insn & 0xfe00) == 0xbd00) /* pop <registers, PC> */ |
4024ca99 UW |
3275 | found_return = 1; |
3276 | } | |
db24da6d | 3277 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instruction */ |
4024ca99 UW |
3278 | { |
3279 | if (target_read_memory (scan_pc, buf, 2)) | |
3280 | break; | |
3281 | ||
3282 | scan_pc += 2; | |
3283 | insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3284 | ||
3285 | if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3286 | { | |
3287 | found_stack_adjust = 1; | |
3288 | if (insn2 & 0x8000) /* <registers> include PC. */ | |
3289 | found_return = 1; | |
3290 | } | |
3291 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3292 | && (insn2 & 0x0fff) == 0x0b04) | |
3293 | { | |
3294 | found_stack_adjust = 1; | |
3295 | if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */ | |
3296 | found_return = 1; | |
3297 | } | |
3298 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3299 | && (insn2 & 0x0e00) == 0x0a00) | |
3300 | found_stack_adjust = 1; | |
3301 | else | |
3302 | break; | |
3303 | } | |
3304 | else | |
3305 | break; | |
3306 | } | |
3307 | ||
3308 | if (!found_return) | |
3309 | return 0; | |
3310 | ||
3311 | /* Since any instruction in the epilogue sequence, with the possible | |
3312 | exception of return itself, updates the stack pointer, we need to | |
3313 | scan backwards for at most one instruction. Try either a 16-bit or | |
3314 | a 32-bit instruction. This is just a heuristic, so we do not worry | |
0963b4bd | 3315 | too much about false positives. */ |
4024ca99 UW |
3316 | |
3317 | if (!found_stack_adjust) | |
3318 | { | |
3319 | if (pc - 4 < func_start) | |
3320 | return 0; | |
3321 | if (target_read_memory (pc - 4, buf, 4)) | |
3322 | return 0; | |
3323 | ||
3324 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3325 | insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code); | |
3326 | ||
540314bd | 3327 | if (thumb_instruction_restores_sp (insn2)) |
4024ca99 UW |
3328 | found_stack_adjust = 1; |
3329 | else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3330 | found_stack_adjust = 1; | |
3331 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3332 | && (insn2 & 0x0fff) == 0x0b04) | |
3333 | found_stack_adjust = 1; | |
3334 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3335 | && (insn2 & 0x0e00) == 0x0a00) | |
3336 | found_stack_adjust = 1; | |
3337 | } | |
3338 | ||
3339 | return found_stack_adjust; | |
3340 | } | |
3341 | ||
3342 | /* Return true if we are in the function's epilogue, i.e. after the | |
3343 | instruction that destroyed the function's stack frame. */ | |
3344 | ||
3345 | static int | |
3346 | arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3347 | { | |
3348 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3349 | unsigned int insn; | |
3350 | int found_return, found_stack_adjust; | |
3351 | CORE_ADDR func_start, func_end; | |
3352 | ||
3353 | if (arm_pc_is_thumb (gdbarch, pc)) | |
3354 | return thumb_in_function_epilogue_p (gdbarch, pc); | |
3355 | ||
3356 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3357 | return 0; | |
3358 | ||
3359 | /* We are in the epilogue if the previous instruction was a stack | |
3360 | adjustment and the next instruction is a possible return (bx, mov | |
3361 | pc, or pop). We could have to scan backwards to find the stack | |
3362 | adjustment, or forwards to find the return, but this is a decent | |
3363 | approximation. First scan forwards. */ | |
3364 | ||
3365 | found_return = 0; | |
3366 | insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
3367 | if (bits (insn, 28, 31) != INST_NV) | |
3368 | { | |
3369 | if ((insn & 0x0ffffff0) == 0x012fff10) | |
3370 | /* BX. */ | |
3371 | found_return = 1; | |
3372 | else if ((insn & 0x0ffffff0) == 0x01a0f000) | |
3373 | /* MOV PC. */ | |
3374 | found_return = 1; | |
3375 | else if ((insn & 0x0fff0000) == 0x08bd0000 | |
3376 | && (insn & 0x0000c000) != 0) | |
3377 | /* POP (LDMIA), including PC or LR. */ | |
3378 | found_return = 1; | |
3379 | } | |
3380 | ||
3381 | if (!found_return) | |
3382 | return 0; | |
3383 | ||
3384 | /* Scan backwards. This is just a heuristic, so do not worry about | |
3385 | false positives from mode changes. */ | |
3386 | ||
3387 | if (pc < func_start + 4) | |
3388 | return 0; | |
3389 | ||
73c964d6 | 3390 | found_stack_adjust = 0; |
4024ca99 UW |
3391 | insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); |
3392 | if (bits (insn, 28, 31) != INST_NV) | |
3393 | { | |
3394 | if ((insn & 0x0df0f000) == 0x0080d000) | |
3395 | /* ADD SP (register or immediate). */ | |
3396 | found_stack_adjust = 1; | |
3397 | else if ((insn & 0x0df0f000) == 0x0040d000) | |
3398 | /* SUB SP (register or immediate). */ | |
3399 | found_stack_adjust = 1; | |
3400 | else if ((insn & 0x0ffffff0) == 0x01a0d000) | |
3401 | /* MOV SP. */ | |
77bc0675 | 3402 | found_stack_adjust = 1; |
4024ca99 UW |
3403 | else if ((insn & 0x0fff0000) == 0x08bd0000) |
3404 | /* POP (LDMIA). */ | |
3405 | found_stack_adjust = 1; | |
fc51cce1 MGD |
3406 | else if ((insn & 0x0fff0000) == 0x049d0000) |
3407 | /* POP of a single register. */ | |
3408 | found_stack_adjust = 1; | |
4024ca99 UW |
3409 | } |
3410 | ||
3411 | if (found_stack_adjust) | |
3412 | return 1; | |
3413 | ||
3414 | return 0; | |
3415 | } | |
3416 | ||
3417 | ||
2dd604e7 RE |
3418 | /* When arguments must be pushed onto the stack, they go on in reverse |
3419 | order. The code below implements a FILO (stack) to do this. */ | |
3420 | ||
3421 | struct stack_item | |
3422 | { | |
3423 | int len; | |
3424 | struct stack_item *prev; | |
3425 | void *data; | |
3426 | }; | |
3427 | ||
3428 | static struct stack_item * | |
8c6363cf | 3429 | push_stack_item (struct stack_item *prev, const void *contents, int len) |
2dd604e7 RE |
3430 | { |
3431 | struct stack_item *si; | |
3432 | si = xmalloc (sizeof (struct stack_item)); | |
226c7fbc | 3433 | si->data = xmalloc (len); |
2dd604e7 RE |
3434 | si->len = len; |
3435 | si->prev = prev; | |
3436 | memcpy (si->data, contents, len); | |
3437 | return si; | |
3438 | } | |
3439 | ||
3440 | static struct stack_item * | |
3441 | pop_stack_item (struct stack_item *si) | |
3442 | { | |
3443 | struct stack_item *dead = si; | |
3444 | si = si->prev; | |
3445 | xfree (dead->data); | |
3446 | xfree (dead); | |
3447 | return si; | |
3448 | } | |
3449 | ||
2af48f68 PB |
3450 | |
3451 | /* Return the alignment (in bytes) of the given type. */ | |
3452 | ||
3453 | static int | |
3454 | arm_type_align (struct type *t) | |
3455 | { | |
3456 | int n; | |
3457 | int align; | |
3458 | int falign; | |
3459 | ||
3460 | t = check_typedef (t); | |
3461 | switch (TYPE_CODE (t)) | |
3462 | { | |
3463 | default: | |
3464 | /* Should never happen. */ | |
3465 | internal_error (__FILE__, __LINE__, _("unknown type alignment")); | |
3466 | return 4; | |
3467 | ||
3468 | case TYPE_CODE_PTR: | |
3469 | case TYPE_CODE_ENUM: | |
3470 | case TYPE_CODE_INT: | |
3471 | case TYPE_CODE_FLT: | |
3472 | case TYPE_CODE_SET: | |
3473 | case TYPE_CODE_RANGE: | |
2af48f68 PB |
3474 | case TYPE_CODE_REF: |
3475 | case TYPE_CODE_CHAR: | |
3476 | case TYPE_CODE_BOOL: | |
3477 | return TYPE_LENGTH (t); | |
3478 | ||
3479 | case TYPE_CODE_ARRAY: | |
3480 | case TYPE_CODE_COMPLEX: | |
3481 | /* TODO: What about vector types? */ | |
3482 | return arm_type_align (TYPE_TARGET_TYPE (t)); | |
3483 | ||
3484 | case TYPE_CODE_STRUCT: | |
3485 | case TYPE_CODE_UNION: | |
3486 | align = 1; | |
3487 | for (n = 0; n < TYPE_NFIELDS (t); n++) | |
3488 | { | |
3489 | falign = arm_type_align (TYPE_FIELD_TYPE (t, n)); | |
3490 | if (falign > align) | |
3491 | align = falign; | |
3492 | } | |
3493 | return align; | |
3494 | } | |
3495 | } | |
3496 | ||
90445bd3 DJ |
3497 | /* Possible base types for a candidate for passing and returning in |
3498 | VFP registers. */ | |
3499 | ||
3500 | enum arm_vfp_cprc_base_type | |
3501 | { | |
3502 | VFP_CPRC_UNKNOWN, | |
3503 | VFP_CPRC_SINGLE, | |
3504 | VFP_CPRC_DOUBLE, | |
3505 | VFP_CPRC_VEC64, | |
3506 | VFP_CPRC_VEC128 | |
3507 | }; | |
3508 | ||
3509 | /* The length of one element of base type B. */ | |
3510 | ||
3511 | static unsigned | |
3512 | arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b) | |
3513 | { | |
3514 | switch (b) | |
3515 | { | |
3516 | case VFP_CPRC_SINGLE: | |
3517 | return 4; | |
3518 | case VFP_CPRC_DOUBLE: | |
3519 | return 8; | |
3520 | case VFP_CPRC_VEC64: | |
3521 | return 8; | |
3522 | case VFP_CPRC_VEC128: | |
3523 | return 16; | |
3524 | default: | |
3525 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3526 | (int) b); | |
3527 | } | |
3528 | } | |
3529 | ||
3530 | /* The character ('s', 'd' or 'q') for the type of VFP register used | |
3531 | for passing base type B. */ | |
3532 | ||
3533 | static int | |
3534 | arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b) | |
3535 | { | |
3536 | switch (b) | |
3537 | { | |
3538 | case VFP_CPRC_SINGLE: | |
3539 | return 's'; | |
3540 | case VFP_CPRC_DOUBLE: | |
3541 | return 'd'; | |
3542 | case VFP_CPRC_VEC64: | |
3543 | return 'd'; | |
3544 | case VFP_CPRC_VEC128: | |
3545 | return 'q'; | |
3546 | default: | |
3547 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3548 | (int) b); | |
3549 | } | |
3550 | } | |
3551 | ||
3552 | /* Determine whether T may be part of a candidate for passing and | |
3553 | returning in VFP registers, ignoring the limit on the total number | |
3554 | of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the | |
3555 | classification of the first valid component found; if it is not | |
3556 | VFP_CPRC_UNKNOWN, all components must have the same classification | |
3557 | as *BASE_TYPE. If it is found that T contains a type not permitted | |
3558 | for passing and returning in VFP registers, a type differently | |
3559 | classified from *BASE_TYPE, or two types differently classified | |
3560 | from each other, return -1, otherwise return the total number of | |
3561 | base-type elements found (possibly 0 in an empty structure or | |
3562 | array). Vectors and complex types are not currently supported, | |
3563 | matching the generic AAPCS support. */ | |
3564 | ||
3565 | static int | |
3566 | arm_vfp_cprc_sub_candidate (struct type *t, | |
3567 | enum arm_vfp_cprc_base_type *base_type) | |
3568 | { | |
3569 | t = check_typedef (t); | |
3570 | switch (TYPE_CODE (t)) | |
3571 | { | |
3572 | case TYPE_CODE_FLT: | |
3573 | switch (TYPE_LENGTH (t)) | |
3574 | { | |
3575 | case 4: | |
3576 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3577 | *base_type = VFP_CPRC_SINGLE; | |
3578 | else if (*base_type != VFP_CPRC_SINGLE) | |
3579 | return -1; | |
3580 | return 1; | |
3581 | ||
3582 | case 8: | |
3583 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3584 | *base_type = VFP_CPRC_DOUBLE; | |
3585 | else if (*base_type != VFP_CPRC_DOUBLE) | |
3586 | return -1; | |
3587 | return 1; | |
3588 | ||
3589 | default: | |
3590 | return -1; | |
3591 | } | |
3592 | break; | |
3593 | ||
3594 | case TYPE_CODE_ARRAY: | |
3595 | { | |
3596 | int count; | |
3597 | unsigned unitlen; | |
3598 | count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type); | |
3599 | if (count == -1) | |
3600 | return -1; | |
3601 | if (TYPE_LENGTH (t) == 0) | |
3602 | { | |
3603 | gdb_assert (count == 0); | |
3604 | return 0; | |
3605 | } | |
3606 | else if (count == 0) | |
3607 | return -1; | |
3608 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3609 | gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0); | |
3610 | return TYPE_LENGTH (t) / unitlen; | |
3611 | } | |
3612 | break; | |
3613 | ||
3614 | case TYPE_CODE_STRUCT: | |
3615 | { | |
3616 | int count = 0; | |
3617 | unsigned unitlen; | |
3618 | int i; | |
3619 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3620 | { | |
3621 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3622 | base_type); | |
3623 | if (sub_count == -1) | |
3624 | return -1; | |
3625 | count += sub_count; | |
3626 | } | |
3627 | if (TYPE_LENGTH (t) == 0) | |
3628 | { | |
3629 | gdb_assert (count == 0); | |
3630 | return 0; | |
3631 | } | |
3632 | else if (count == 0) | |
3633 | return -1; | |
3634 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3635 | if (TYPE_LENGTH (t) != unitlen * count) | |
3636 | return -1; | |
3637 | return count; | |
3638 | } | |
3639 | ||
3640 | case TYPE_CODE_UNION: | |
3641 | { | |
3642 | int count = 0; | |
3643 | unsigned unitlen; | |
3644 | int i; | |
3645 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3646 | { | |
3647 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3648 | base_type); | |
3649 | if (sub_count == -1) | |
3650 | return -1; | |
3651 | count = (count > sub_count ? count : sub_count); | |
3652 | } | |
3653 | if (TYPE_LENGTH (t) == 0) | |
3654 | { | |
3655 | gdb_assert (count == 0); | |
3656 | return 0; | |
3657 | } | |
3658 | else if (count == 0) | |
3659 | return -1; | |
3660 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3661 | if (TYPE_LENGTH (t) != unitlen * count) | |
3662 | return -1; | |
3663 | return count; | |
3664 | } | |
3665 | ||
3666 | default: | |
3667 | break; | |
3668 | } | |
3669 | ||
3670 | return -1; | |
3671 | } | |
3672 | ||
3673 | /* Determine whether T is a VFP co-processor register candidate (CPRC) | |
3674 | if passed to or returned from a non-variadic function with the VFP | |
3675 | ABI in effect. Return 1 if it is, 0 otherwise. If it is, set | |
3676 | *BASE_TYPE to the base type for T and *COUNT to the number of | |
3677 | elements of that base type before returning. */ | |
3678 | ||
3679 | static int | |
3680 | arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type, | |
3681 | int *count) | |
3682 | { | |
3683 | enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN; | |
3684 | int c = arm_vfp_cprc_sub_candidate (t, &b); | |
3685 | if (c <= 0 || c > 4) | |
3686 | return 0; | |
3687 | *base_type = b; | |
3688 | *count = c; | |
3689 | return 1; | |
3690 | } | |
3691 | ||
3692 | /* Return 1 if the VFP ABI should be used for passing arguments to and | |
3693 | returning values from a function of type FUNC_TYPE, 0 | |
3694 | otherwise. */ | |
3695 | ||
3696 | static int | |
3697 | arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type) | |
3698 | { | |
3699 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3700 | /* Variadic functions always use the base ABI. Assume that functions | |
3701 | without debug info are not variadic. */ | |
3702 | if (func_type && TYPE_VARARGS (check_typedef (func_type))) | |
3703 | return 0; | |
3704 | /* The VFP ABI is only supported as a variant of AAPCS. */ | |
3705 | if (tdep->arm_abi != ARM_ABI_AAPCS) | |
3706 | return 0; | |
3707 | return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP; | |
3708 | } | |
3709 | ||
3710 | /* We currently only support passing parameters in integer registers, which | |
3711 | conforms with GCC's default model, and VFP argument passing following | |
3712 | the VFP variant of AAPCS. Several other variants exist and | |
2dd604e7 RE |
3713 | we should probably support some of them based on the selected ABI. */ |
3714 | ||
3715 | static CORE_ADDR | |
7d9b040b | 3716 | arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
6a65450a AC |
3717 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
3718 | struct value **args, CORE_ADDR sp, int struct_return, | |
3719 | CORE_ADDR struct_addr) | |
2dd604e7 | 3720 | { |
e17a4113 | 3721 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
2dd604e7 RE |
3722 | int argnum; |
3723 | int argreg; | |
3724 | int nstack; | |
3725 | struct stack_item *si = NULL; | |
90445bd3 DJ |
3726 | int use_vfp_abi; |
3727 | struct type *ftype; | |
3728 | unsigned vfp_regs_free = (1 << 16) - 1; | |
3729 | ||
3730 | /* Determine the type of this function and whether the VFP ABI | |
3731 | applies. */ | |
3732 | ftype = check_typedef (value_type (function)); | |
3733 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
3734 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
3735 | use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype); | |
2dd604e7 | 3736 | |
6a65450a AC |
3737 | /* Set the return address. For the ARM, the return breakpoint is |
3738 | always at BP_ADDR. */ | |
9779414d | 3739 | if (arm_pc_is_thumb (gdbarch, bp_addr)) |
9dca5578 | 3740 | bp_addr |= 1; |
6a65450a | 3741 | regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr); |
2dd604e7 RE |
3742 | |
3743 | /* Walk through the list of args and determine how large a temporary | |
3744 | stack is required. Need to take care here as structs may be | |
7a9dd1b2 | 3745 | passed on the stack, and we have to push them. */ |
2dd604e7 RE |
3746 | nstack = 0; |
3747 | ||
3748 | argreg = ARM_A1_REGNUM; | |
3749 | nstack = 0; | |
3750 | ||
2dd604e7 RE |
3751 | /* The struct_return pointer occupies the first parameter |
3752 | passing register. */ | |
3753 | if (struct_return) | |
3754 | { | |
3755 | if (arm_debug) | |
5af949e3 | 3756 | fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n", |
2af46ca0 | 3757 | gdbarch_register_name (gdbarch, argreg), |
5af949e3 | 3758 | paddress (gdbarch, struct_addr)); |
2dd604e7 RE |
3759 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
3760 | argreg++; | |
3761 | } | |
3762 | ||
3763 | for (argnum = 0; argnum < nargs; argnum++) | |
3764 | { | |
3765 | int len; | |
3766 | struct type *arg_type; | |
3767 | struct type *target_type; | |
3768 | enum type_code typecode; | |
8c6363cf | 3769 | const bfd_byte *val; |
2af48f68 | 3770 | int align; |
90445bd3 DJ |
3771 | enum arm_vfp_cprc_base_type vfp_base_type; |
3772 | int vfp_base_count; | |
3773 | int may_use_core_reg = 1; | |
2dd604e7 | 3774 | |
df407dfe | 3775 | arg_type = check_typedef (value_type (args[argnum])); |
2dd604e7 RE |
3776 | len = TYPE_LENGTH (arg_type); |
3777 | target_type = TYPE_TARGET_TYPE (arg_type); | |
3778 | typecode = TYPE_CODE (arg_type); | |
8c6363cf | 3779 | val = value_contents (args[argnum]); |
2dd604e7 | 3780 | |
2af48f68 PB |
3781 | align = arm_type_align (arg_type); |
3782 | /* Round alignment up to a whole number of words. */ | |
3783 | align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1); | |
3784 | /* Different ABIs have different maximum alignments. */ | |
3785 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS) | |
3786 | { | |
3787 | /* The APCS ABI only requires word alignment. */ | |
3788 | align = INT_REGISTER_SIZE; | |
3789 | } | |
3790 | else | |
3791 | { | |
3792 | /* The AAPCS requires at most doubleword alignment. */ | |
3793 | if (align > INT_REGISTER_SIZE * 2) | |
3794 | align = INT_REGISTER_SIZE * 2; | |
3795 | } | |
3796 | ||
90445bd3 DJ |
3797 | if (use_vfp_abi |
3798 | && arm_vfp_call_candidate (arg_type, &vfp_base_type, | |
3799 | &vfp_base_count)) | |
3800 | { | |
3801 | int regno; | |
3802 | int unit_length; | |
3803 | int shift; | |
3804 | unsigned mask; | |
3805 | ||
3806 | /* Because this is a CPRC it cannot go in a core register or | |
3807 | cause a core register to be skipped for alignment. | |
3808 | Either it goes in VFP registers and the rest of this loop | |
3809 | iteration is skipped for this argument, or it goes on the | |
3810 | stack (and the stack alignment code is correct for this | |
3811 | case). */ | |
3812 | may_use_core_reg = 0; | |
3813 | ||
3814 | unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
3815 | shift = unit_length / 4; | |
3816 | mask = (1 << (shift * vfp_base_count)) - 1; | |
3817 | for (regno = 0; regno < 16; regno += shift) | |
3818 | if (((vfp_regs_free >> regno) & mask) == mask) | |
3819 | break; | |
3820 | ||
3821 | if (regno < 16) | |
3822 | { | |
3823 | int reg_char; | |
3824 | int reg_scaled; | |
3825 | int i; | |
3826 | ||
3827 | vfp_regs_free &= ~(mask << regno); | |
3828 | reg_scaled = regno / shift; | |
3829 | reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
3830 | for (i = 0; i < vfp_base_count; i++) | |
3831 | { | |
3832 | char name_buf[4]; | |
3833 | int regnum; | |
58d6951d DJ |
3834 | if (reg_char == 'q') |
3835 | arm_neon_quad_write (gdbarch, regcache, reg_scaled + i, | |
90445bd3 | 3836 | val + i * unit_length); |
58d6951d DJ |
3837 | else |
3838 | { | |
8c042590 PM |
3839 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", |
3840 | reg_char, reg_scaled + i); | |
58d6951d DJ |
3841 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
3842 | strlen (name_buf)); | |
3843 | regcache_cooked_write (regcache, regnum, | |
3844 | val + i * unit_length); | |
3845 | } | |
90445bd3 DJ |
3846 | } |
3847 | continue; | |
3848 | } | |
3849 | else | |
3850 | { | |
3851 | /* This CPRC could not go in VFP registers, so all VFP | |
3852 | registers are now marked as used. */ | |
3853 | vfp_regs_free = 0; | |
3854 | } | |
3855 | } | |
3856 | ||
2af48f68 PB |
3857 | /* Push stack padding for dowubleword alignment. */ |
3858 | if (nstack & (align - 1)) | |
3859 | { | |
3860 | si = push_stack_item (si, val, INT_REGISTER_SIZE); | |
3861 | nstack += INT_REGISTER_SIZE; | |
3862 | } | |
3863 | ||
3864 | /* Doubleword aligned quantities must go in even register pairs. */ | |
90445bd3 DJ |
3865 | if (may_use_core_reg |
3866 | && argreg <= ARM_LAST_ARG_REGNUM | |
2af48f68 PB |
3867 | && align > INT_REGISTER_SIZE |
3868 | && argreg & 1) | |
3869 | argreg++; | |
3870 | ||
2dd604e7 RE |
3871 | /* If the argument is a pointer to a function, and it is a |
3872 | Thumb function, create a LOCAL copy of the value and set | |
3873 | the THUMB bit in it. */ | |
3874 | if (TYPE_CODE_PTR == typecode | |
3875 | && target_type != NULL | |
f96b8fa0 | 3876 | && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type))) |
2dd604e7 | 3877 | { |
e17a4113 | 3878 | CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order); |
9779414d | 3879 | if (arm_pc_is_thumb (gdbarch, regval)) |
2dd604e7 | 3880 | { |
8c6363cf TT |
3881 | bfd_byte *copy = alloca (len); |
3882 | store_unsigned_integer (copy, len, byte_order, | |
e17a4113 | 3883 | MAKE_THUMB_ADDR (regval)); |
8c6363cf | 3884 | val = copy; |
2dd604e7 RE |
3885 | } |
3886 | } | |
3887 | ||
3888 | /* Copy the argument to general registers or the stack in | |
3889 | register-sized pieces. Large arguments are split between | |
3890 | registers and stack. */ | |
3891 | while (len > 0) | |
3892 | { | |
f0c9063c | 3893 | int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE; |
2dd604e7 | 3894 | |
90445bd3 | 3895 | if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM) |
2dd604e7 RE |
3896 | { |
3897 | /* The argument is being passed in a general purpose | |
3898 | register. */ | |
e17a4113 UW |
3899 | CORE_ADDR regval |
3900 | = extract_unsigned_integer (val, partial_len, byte_order); | |
3901 | if (byte_order == BFD_ENDIAN_BIG) | |
8bf8793c | 3902 | regval <<= (INT_REGISTER_SIZE - partial_len) * 8; |
2dd604e7 RE |
3903 | if (arm_debug) |
3904 | fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", | |
c9f4d572 UW |
3905 | argnum, |
3906 | gdbarch_register_name | |
2af46ca0 | 3907 | (gdbarch, argreg), |
f0c9063c | 3908 | phex (regval, INT_REGISTER_SIZE)); |
2dd604e7 RE |
3909 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
3910 | argreg++; | |
3911 | } | |
3912 | else | |
3913 | { | |
3914 | /* Push the arguments onto the stack. */ | |
3915 | if (arm_debug) | |
3916 | fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n", | |
3917 | argnum, nstack); | |
f0c9063c UW |
3918 | si = push_stack_item (si, val, INT_REGISTER_SIZE); |
3919 | nstack += INT_REGISTER_SIZE; | |
2dd604e7 RE |
3920 | } |
3921 | ||
3922 | len -= partial_len; | |
3923 | val += partial_len; | |
3924 | } | |
3925 | } | |
3926 | /* If we have an odd number of words to push, then decrement the stack | |
3927 | by one word now, so first stack argument will be dword aligned. */ | |
3928 | if (nstack & 4) | |
3929 | sp -= 4; | |
3930 | ||
3931 | while (si) | |
3932 | { | |
3933 | sp -= si->len; | |
3934 | write_memory (sp, si->data, si->len); | |
3935 | si = pop_stack_item (si); | |
3936 | } | |
3937 | ||
3938 | /* Finally, update teh SP register. */ | |
3939 | regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp); | |
3940 | ||
3941 | return sp; | |
3942 | } | |
3943 | ||
f53f0d0b PB |
3944 | |
3945 | /* Always align the frame to an 8-byte boundary. This is required on | |
3946 | some platforms and harmless on the rest. */ | |
3947 | ||
3948 | static CORE_ADDR | |
3949 | arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
3950 | { | |
3951 | /* Align the stack to eight bytes. */ | |
3952 | return sp & ~ (CORE_ADDR) 7; | |
3953 | } | |
3954 | ||
c906108c | 3955 | static void |
12b27276 | 3956 | print_fpu_flags (struct ui_file *file, int flags) |
c906108c | 3957 | { |
c5aa993b | 3958 | if (flags & (1 << 0)) |
12b27276 | 3959 | fputs_filtered ("IVO ", file); |
c5aa993b | 3960 | if (flags & (1 << 1)) |
12b27276 | 3961 | fputs_filtered ("DVZ ", file); |
c5aa993b | 3962 | if (flags & (1 << 2)) |
12b27276 | 3963 | fputs_filtered ("OFL ", file); |
c5aa993b | 3964 | if (flags & (1 << 3)) |
12b27276 | 3965 | fputs_filtered ("UFL ", file); |
c5aa993b | 3966 | if (flags & (1 << 4)) |
12b27276 WN |
3967 | fputs_filtered ("INX ", file); |
3968 | fputc_filtered ('\n', file); | |
c906108c SS |
3969 | } |
3970 | ||
5e74b15c RE |
3971 | /* Print interesting information about the floating point processor |
3972 | (if present) or emulator. */ | |
34e8f22d | 3973 | static void |
d855c300 | 3974 | arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
23e3a7ac | 3975 | struct frame_info *frame, const char *args) |
c906108c | 3976 | { |
9c9acae0 | 3977 | unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM); |
c5aa993b JM |
3978 | int type; |
3979 | ||
3980 | type = (status >> 24) & 127; | |
edefbb7c | 3981 | if (status & (1 << 31)) |
12b27276 | 3982 | fprintf_filtered (file, _("Hardware FPU type %d\n"), type); |
edefbb7c | 3983 | else |
12b27276 | 3984 | fprintf_filtered (file, _("Software FPU type %d\n"), type); |
edefbb7c | 3985 | /* i18n: [floating point unit] mask */ |
12b27276 WN |
3986 | fputs_filtered (_("mask: "), file); |
3987 | print_fpu_flags (file, status >> 16); | |
edefbb7c | 3988 | /* i18n: [floating point unit] flags */ |
12b27276 WN |
3989 | fputs_filtered (_("flags: "), file); |
3990 | print_fpu_flags (file, status); | |
c906108c SS |
3991 | } |
3992 | ||
27067745 UW |
3993 | /* Construct the ARM extended floating point type. */ |
3994 | static struct type * | |
3995 | arm_ext_type (struct gdbarch *gdbarch) | |
3996 | { | |
3997 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3998 | ||
3999 | if (!tdep->arm_ext_type) | |
4000 | tdep->arm_ext_type | |
e9bb382b | 4001 | = arch_float_type (gdbarch, -1, "builtin_type_arm_ext", |
27067745 UW |
4002 | floatformats_arm_ext); |
4003 | ||
4004 | return tdep->arm_ext_type; | |
4005 | } | |
4006 | ||
58d6951d DJ |
4007 | static struct type * |
4008 | arm_neon_double_type (struct gdbarch *gdbarch) | |
4009 | { | |
4010 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4011 | ||
4012 | if (tdep->neon_double_type == NULL) | |
4013 | { | |
4014 | struct type *t, *elem; | |
4015 | ||
4016 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d", | |
4017 | TYPE_CODE_UNION); | |
4018 | elem = builtin_type (gdbarch)->builtin_uint8; | |
4019 | append_composite_type_field (t, "u8", init_vector_type (elem, 8)); | |
4020 | elem = builtin_type (gdbarch)->builtin_uint16; | |
4021 | append_composite_type_field (t, "u16", init_vector_type (elem, 4)); | |
4022 | elem = builtin_type (gdbarch)->builtin_uint32; | |
4023 | append_composite_type_field (t, "u32", init_vector_type (elem, 2)); | |
4024 | elem = builtin_type (gdbarch)->builtin_uint64; | |
4025 | append_composite_type_field (t, "u64", elem); | |
4026 | elem = builtin_type (gdbarch)->builtin_float; | |
4027 | append_composite_type_field (t, "f32", init_vector_type (elem, 2)); | |
4028 | elem = builtin_type (gdbarch)->builtin_double; | |
4029 | append_composite_type_field (t, "f64", elem); | |
4030 | ||
4031 | TYPE_VECTOR (t) = 1; | |
4032 | TYPE_NAME (t) = "neon_d"; | |
4033 | tdep->neon_double_type = t; | |
4034 | } | |
4035 | ||
4036 | return tdep->neon_double_type; | |
4037 | } | |
4038 | ||
4039 | /* FIXME: The vector types are not correctly ordered on big-endian | |
4040 | targets. Just as s0 is the low bits of d0, d0[0] is also the low | |
4041 | bits of d0 - regardless of what unit size is being held in d0. So | |
4042 | the offset of the first uint8 in d0 is 7, but the offset of the | |
4043 | first float is 4. This code works as-is for little-endian | |
4044 | targets. */ | |
4045 | ||
4046 | static struct type * | |
4047 | arm_neon_quad_type (struct gdbarch *gdbarch) | |
4048 | { | |
4049 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4050 | ||
4051 | if (tdep->neon_quad_type == NULL) | |
4052 | { | |
4053 | struct type *t, *elem; | |
4054 | ||
4055 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q", | |
4056 | TYPE_CODE_UNION); | |
4057 | elem = builtin_type (gdbarch)->builtin_uint8; | |
4058 | append_composite_type_field (t, "u8", init_vector_type (elem, 16)); | |
4059 | elem = builtin_type (gdbarch)->builtin_uint16; | |
4060 | append_composite_type_field (t, "u16", init_vector_type (elem, 8)); | |
4061 | elem = builtin_type (gdbarch)->builtin_uint32; | |
4062 | append_composite_type_field (t, "u32", init_vector_type (elem, 4)); | |
4063 | elem = builtin_type (gdbarch)->builtin_uint64; | |
4064 | append_composite_type_field (t, "u64", init_vector_type (elem, 2)); | |
4065 | elem = builtin_type (gdbarch)->builtin_float; | |
4066 | append_composite_type_field (t, "f32", init_vector_type (elem, 4)); | |
4067 | elem = builtin_type (gdbarch)->builtin_double; | |
4068 | append_composite_type_field (t, "f64", init_vector_type (elem, 2)); | |
4069 | ||
4070 | TYPE_VECTOR (t) = 1; | |
4071 | TYPE_NAME (t) = "neon_q"; | |
4072 | tdep->neon_quad_type = t; | |
4073 | } | |
4074 | ||
4075 | return tdep->neon_quad_type; | |
4076 | } | |
4077 | ||
34e8f22d RE |
4078 | /* Return the GDB type object for the "standard" data type of data in |
4079 | register N. */ | |
4080 | ||
4081 | static struct type * | |
7a5ea0d4 | 4082 | arm_register_type (struct gdbarch *gdbarch, int regnum) |
032758dc | 4083 | { |
58d6951d DJ |
4084 | int num_regs = gdbarch_num_regs (gdbarch); |
4085 | ||
4086 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
4087 | && regnum >= num_regs && regnum < num_regs + 32) | |
4088 | return builtin_type (gdbarch)->builtin_float; | |
4089 | ||
4090 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
4091 | && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16) | |
4092 | return arm_neon_quad_type (gdbarch); | |
4093 | ||
4094 | /* If the target description has register information, we are only | |
4095 | in this function so that we can override the types of | |
4096 | double-precision registers for NEON. */ | |
4097 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
4098 | { | |
4099 | struct type *t = tdesc_register_type (gdbarch, regnum); | |
4100 | ||
4101 | if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32 | |
4102 | && TYPE_CODE (t) == TYPE_CODE_FLT | |
4103 | && gdbarch_tdep (gdbarch)->have_neon) | |
4104 | return arm_neon_double_type (gdbarch); | |
4105 | else | |
4106 | return t; | |
4107 | } | |
4108 | ||
34e8f22d | 4109 | if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS) |
58d6951d DJ |
4110 | { |
4111 | if (!gdbarch_tdep (gdbarch)->have_fpa_registers) | |
4112 | return builtin_type (gdbarch)->builtin_void; | |
4113 | ||
4114 | return arm_ext_type (gdbarch); | |
4115 | } | |
e4c16157 | 4116 | else if (regnum == ARM_SP_REGNUM) |
0dfff4cb | 4117 | return builtin_type (gdbarch)->builtin_data_ptr; |
e4c16157 | 4118 | else if (regnum == ARM_PC_REGNUM) |
0dfff4cb | 4119 | return builtin_type (gdbarch)->builtin_func_ptr; |
ff6f572f DJ |
4120 | else if (regnum >= ARRAY_SIZE (arm_register_names)) |
4121 | /* These registers are only supported on targets which supply | |
4122 | an XML description. */ | |
df4df182 | 4123 | return builtin_type (gdbarch)->builtin_int0; |
032758dc | 4124 | else |
df4df182 | 4125 | return builtin_type (gdbarch)->builtin_uint32; |
032758dc AC |
4126 | } |
4127 | ||
ff6f572f DJ |
4128 | /* Map a DWARF register REGNUM onto the appropriate GDB register |
4129 | number. */ | |
4130 | ||
4131 | static int | |
d3f73121 | 4132 | arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
ff6f572f DJ |
4133 | { |
4134 | /* Core integer regs. */ | |
4135 | if (reg >= 0 && reg <= 15) | |
4136 | return reg; | |
4137 | ||
4138 | /* Legacy FPA encoding. These were once used in a way which | |
4139 | overlapped with VFP register numbering, so their use is | |
4140 | discouraged, but GDB doesn't support the ARM toolchain | |
4141 | which used them for VFP. */ | |
4142 | if (reg >= 16 && reg <= 23) | |
4143 | return ARM_F0_REGNUM + reg - 16; | |
4144 | ||
4145 | /* New assignments for the FPA registers. */ | |
4146 | if (reg >= 96 && reg <= 103) | |
4147 | return ARM_F0_REGNUM + reg - 96; | |
4148 | ||
4149 | /* WMMX register assignments. */ | |
4150 | if (reg >= 104 && reg <= 111) | |
4151 | return ARM_WCGR0_REGNUM + reg - 104; | |
4152 | ||
4153 | if (reg >= 112 && reg <= 127) | |
4154 | return ARM_WR0_REGNUM + reg - 112; | |
4155 | ||
4156 | if (reg >= 192 && reg <= 199) | |
4157 | return ARM_WC0_REGNUM + reg - 192; | |
4158 | ||
58d6951d DJ |
4159 | /* VFP v2 registers. A double precision value is actually |
4160 | in d1 rather than s2, but the ABI only defines numbering | |
4161 | for the single precision registers. This will "just work" | |
4162 | in GDB for little endian targets (we'll read eight bytes, | |
4163 | starting in s0 and then progressing to s1), but will be | |
4164 | reversed on big endian targets with VFP. This won't | |
4165 | be a problem for the new Neon quad registers; you're supposed | |
4166 | to use DW_OP_piece for those. */ | |
4167 | if (reg >= 64 && reg <= 95) | |
4168 | { | |
4169 | char name_buf[4]; | |
4170 | ||
8c042590 | 4171 | xsnprintf (name_buf, sizeof (name_buf), "s%d", reg - 64); |
58d6951d DJ |
4172 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4173 | strlen (name_buf)); | |
4174 | } | |
4175 | ||
4176 | /* VFP v3 / Neon registers. This range is also used for VFP v2 | |
4177 | registers, except that it now describes d0 instead of s0. */ | |
4178 | if (reg >= 256 && reg <= 287) | |
4179 | { | |
4180 | char name_buf[4]; | |
4181 | ||
8c042590 | 4182 | xsnprintf (name_buf, sizeof (name_buf), "d%d", reg - 256); |
58d6951d DJ |
4183 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4184 | strlen (name_buf)); | |
4185 | } | |
4186 | ||
ff6f572f DJ |
4187 | return -1; |
4188 | } | |
4189 | ||
26216b98 AC |
4190 | /* Map GDB internal REGNUM onto the Arm simulator register numbers. */ |
4191 | static int | |
e7faf938 | 4192 | arm_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
26216b98 AC |
4193 | { |
4194 | int reg = regnum; | |
e7faf938 | 4195 | gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch)); |
26216b98 | 4196 | |
ff6f572f DJ |
4197 | if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM) |
4198 | return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM; | |
4199 | ||
4200 | if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM) | |
4201 | return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM; | |
4202 | ||
4203 | if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM) | |
4204 | return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM; | |
4205 | ||
26216b98 AC |
4206 | if (reg < NUM_GREGS) |
4207 | return SIM_ARM_R0_REGNUM + reg; | |
4208 | reg -= NUM_GREGS; | |
4209 | ||
4210 | if (reg < NUM_FREGS) | |
4211 | return SIM_ARM_FP0_REGNUM + reg; | |
4212 | reg -= NUM_FREGS; | |
4213 | ||
4214 | if (reg < NUM_SREGS) | |
4215 | return SIM_ARM_FPS_REGNUM + reg; | |
4216 | reg -= NUM_SREGS; | |
4217 | ||
edefbb7c | 4218 | internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum); |
26216b98 | 4219 | } |
34e8f22d | 4220 | |
a37b3cc0 AC |
4221 | /* NOTE: cagney/2001-08-20: Both convert_from_extended() and |
4222 | convert_to_extended() use floatformat_arm_ext_littlebyte_bigword. | |
4223 | It is thought that this is is the floating-point register format on | |
4224 | little-endian systems. */ | |
c906108c | 4225 | |
ed9a39eb | 4226 | static void |
b508a996 | 4227 | convert_from_extended (const struct floatformat *fmt, const void *ptr, |
be8626e0 | 4228 | void *dbl, int endianess) |
c906108c | 4229 | { |
a37b3cc0 | 4230 | DOUBLEST d; |
be8626e0 MD |
4231 | |
4232 | if (endianess == BFD_ENDIAN_BIG) | |
a37b3cc0 AC |
4233 | floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d); |
4234 | else | |
4235 | floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4236 | ptr, &d); | |
b508a996 | 4237 | floatformat_from_doublest (fmt, &d, dbl); |
c906108c SS |
4238 | } |
4239 | ||
34e8f22d | 4240 | static void |
be8626e0 MD |
4241 | convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr, |
4242 | int endianess) | |
c906108c | 4243 | { |
a37b3cc0 | 4244 | DOUBLEST d; |
be8626e0 | 4245 | |
b508a996 | 4246 | floatformat_to_doublest (fmt, ptr, &d); |
be8626e0 | 4247 | if (endianess == BFD_ENDIAN_BIG) |
a37b3cc0 AC |
4248 | floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl); |
4249 | else | |
4250 | floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4251 | &d, dbl); | |
c906108c | 4252 | } |
ed9a39eb | 4253 | |
c906108c | 4254 | static int |
ed9a39eb | 4255 | condition_true (unsigned long cond, unsigned long status_reg) |
c906108c SS |
4256 | { |
4257 | if (cond == INST_AL || cond == INST_NV) | |
4258 | return 1; | |
4259 | ||
4260 | switch (cond) | |
4261 | { | |
4262 | case INST_EQ: | |
4263 | return ((status_reg & FLAG_Z) != 0); | |
4264 | case INST_NE: | |
4265 | return ((status_reg & FLAG_Z) == 0); | |
4266 | case INST_CS: | |
4267 | return ((status_reg & FLAG_C) != 0); | |
4268 | case INST_CC: | |
4269 | return ((status_reg & FLAG_C) == 0); | |
4270 | case INST_MI: | |
4271 | return ((status_reg & FLAG_N) != 0); | |
4272 | case INST_PL: | |
4273 | return ((status_reg & FLAG_N) == 0); | |
4274 | case INST_VS: | |
4275 | return ((status_reg & FLAG_V) != 0); | |
4276 | case INST_VC: | |
4277 | return ((status_reg & FLAG_V) == 0); | |
4278 | case INST_HI: | |
4279 | return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C); | |
4280 | case INST_LS: | |
4281 | return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C); | |
4282 | case INST_GE: | |
4283 | return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)); | |
4284 | case INST_LT: | |
4285 | return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)); | |
4286 | case INST_GT: | |
f8bf5763 PM |
4287 | return (((status_reg & FLAG_Z) == 0) |
4288 | && (((status_reg & FLAG_N) == 0) | |
4289 | == ((status_reg & FLAG_V) == 0))); | |
c906108c | 4290 | case INST_LE: |
f8bf5763 PM |
4291 | return (((status_reg & FLAG_Z) != 0) |
4292 | || (((status_reg & FLAG_N) == 0) | |
4293 | != ((status_reg & FLAG_V) == 0))); | |
c906108c SS |
4294 | } |
4295 | return 1; | |
4296 | } | |
4297 | ||
c906108c | 4298 | static unsigned long |
0b1b3e42 UW |
4299 | shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry, |
4300 | unsigned long pc_val, unsigned long status_reg) | |
c906108c SS |
4301 | { |
4302 | unsigned long res, shift; | |
4303 | int rm = bits (inst, 0, 3); | |
4304 | unsigned long shifttype = bits (inst, 5, 6); | |
c5aa993b JM |
4305 | |
4306 | if (bit (inst, 4)) | |
c906108c SS |
4307 | { |
4308 | int rs = bits (inst, 8, 11); | |
0b1b3e42 UW |
4309 | shift = (rs == 15 ? pc_val + 8 |
4310 | : get_frame_register_unsigned (frame, rs)) & 0xFF; | |
c906108c SS |
4311 | } |
4312 | else | |
4313 | shift = bits (inst, 7, 11); | |
c5aa993b | 4314 | |
bf9f652a | 4315 | res = (rm == ARM_PC_REGNUM |
0d39a070 | 4316 | ? (pc_val + (bit (inst, 4) ? 12 : 8)) |
0b1b3e42 | 4317 | : get_frame_register_unsigned (frame, rm)); |
c906108c SS |
4318 | |
4319 | switch (shifttype) | |
4320 | { | |
c5aa993b | 4321 | case 0: /* LSL */ |
c906108c SS |
4322 | res = shift >= 32 ? 0 : res << shift; |
4323 | break; | |
c5aa993b JM |
4324 | |
4325 | case 1: /* LSR */ | |
c906108c SS |
4326 | res = shift >= 32 ? 0 : res >> shift; |
4327 | break; | |
4328 | ||
c5aa993b JM |
4329 | case 2: /* ASR */ |
4330 | if (shift >= 32) | |
4331 | shift = 31; | |
c906108c SS |
4332 | res = ((res & 0x80000000L) |
4333 | ? ~((~res) >> shift) : res >> shift); | |
4334 | break; | |
4335 | ||
c5aa993b | 4336 | case 3: /* ROR/RRX */ |
c906108c SS |
4337 | shift &= 31; |
4338 | if (shift == 0) | |
4339 | res = (res >> 1) | (carry ? 0x80000000L : 0); | |
4340 | else | |
c5aa993b | 4341 | res = (res >> shift) | (res << (32 - shift)); |
c906108c SS |
4342 | break; |
4343 | } | |
4344 | ||
4345 | return res & 0xffffffff; | |
4346 | } | |
4347 | ||
c906108c SS |
4348 | /* Return number of 1-bits in VAL. */ |
4349 | ||
4350 | static int | |
ed9a39eb | 4351 | bitcount (unsigned long val) |
c906108c SS |
4352 | { |
4353 | int nbits; | |
4354 | for (nbits = 0; val != 0; nbits++) | |
0963b4bd | 4355 | val &= val - 1; /* Delete rightmost 1-bit in val. */ |
c906108c SS |
4356 | return nbits; |
4357 | } | |
4358 | ||
177321bd DJ |
4359 | /* Return the size in bytes of the complete Thumb instruction whose |
4360 | first halfword is INST1. */ | |
4361 | ||
4362 | static int | |
4363 | thumb_insn_size (unsigned short inst1) | |
4364 | { | |
4365 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) | |
4366 | return 4; | |
4367 | else | |
4368 | return 2; | |
4369 | } | |
4370 | ||
4371 | static int | |
4372 | thumb_advance_itstate (unsigned int itstate) | |
4373 | { | |
4374 | /* Preserve IT[7:5], the first three bits of the condition. Shift | |
4375 | the upcoming condition flags left by one bit. */ | |
4376 | itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f); | |
4377 | ||
4378 | /* If we have finished the IT block, clear the state. */ | |
4379 | if ((itstate & 0x0f) == 0) | |
4380 | itstate = 0; | |
4381 | ||
4382 | return itstate; | |
4383 | } | |
4384 | ||
4385 | /* Find the next PC after the current instruction executes. In some | |
4386 | cases we can not statically determine the answer (see the IT state | |
4387 | handling in this function); in that case, a breakpoint may be | |
4388 | inserted in addition to the returned PC, which will be used to set | |
4389 | another breakpoint by our caller. */ | |
4390 | ||
ad527d2e | 4391 | static CORE_ADDR |
18819fa6 | 4392 | thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4393 | { |
2af46ca0 | 4394 | struct gdbarch *gdbarch = get_frame_arch (frame); |
177321bd | 4395 | struct address_space *aspace = get_frame_address_space (frame); |
e17a4113 UW |
4396 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4397 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c5aa993b | 4398 | unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */ |
e17a4113 | 4399 | unsigned short inst1; |
0963b4bd | 4400 | CORE_ADDR nextpc = pc + 2; /* Default is next instruction. */ |
c906108c | 4401 | unsigned long offset; |
177321bd | 4402 | ULONGEST status, itstate; |
c906108c | 4403 | |
50e98be4 DJ |
4404 | nextpc = MAKE_THUMB_ADDR (nextpc); |
4405 | pc_val = MAKE_THUMB_ADDR (pc_val); | |
4406 | ||
e17a4113 | 4407 | inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code); |
9d4fde75 | 4408 | |
9dca5578 DJ |
4409 | /* Thumb-2 conditional execution support. There are eight bits in |
4410 | the CPSR which describe conditional execution state. Once | |
4411 | reconstructed (they're in a funny order), the low five bits | |
4412 | describe the low bit of the condition for each instruction and | |
4413 | how many instructions remain. The high three bits describe the | |
4414 | base condition. One of the low four bits will be set if an IT | |
4415 | block is active. These bits read as zero on earlier | |
4416 | processors. */ | |
4417 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
177321bd | 4418 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); |
9dca5578 | 4419 | |
177321bd DJ |
4420 | /* If-Then handling. On GNU/Linux, where this routine is used, we |
4421 | use an undefined instruction as a breakpoint. Unlike BKPT, IT | |
4422 | can disable execution of the undefined instruction. So we might | |
4423 | miss the breakpoint if we set it on a skipped conditional | |
4424 | instruction. Because conditional instructions can change the | |
4425 | flags, affecting the execution of further instructions, we may | |
4426 | need to set two breakpoints. */ | |
9dca5578 | 4427 | |
177321bd DJ |
4428 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL) |
4429 | { | |
4430 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
4431 | { | |
4432 | /* An IT instruction. Because this instruction does not | |
4433 | modify the flags, we can accurately predict the next | |
4434 | executed instruction. */ | |
4435 | itstate = inst1 & 0x00ff; | |
4436 | pc += thumb_insn_size (inst1); | |
4437 | ||
4438 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4439 | { | |
0963b4bd MS |
4440 | inst1 = read_memory_unsigned_integer (pc, 2, |
4441 | byte_order_for_code); | |
177321bd DJ |
4442 | pc += thumb_insn_size (inst1); |
4443 | itstate = thumb_advance_itstate (itstate); | |
4444 | } | |
4445 | ||
50e98be4 | 4446 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4447 | } |
4448 | else if (itstate != 0) | |
4449 | { | |
4450 | /* We are in a conditional block. Check the condition. */ | |
4451 | if (! condition_true (itstate >> 4, status)) | |
4452 | { | |
4453 | /* Advance to the next executed instruction. */ | |
4454 | pc += thumb_insn_size (inst1); | |
4455 | itstate = thumb_advance_itstate (itstate); | |
4456 | ||
4457 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4458 | { | |
0963b4bd MS |
4459 | inst1 = read_memory_unsigned_integer (pc, 2, |
4460 | byte_order_for_code); | |
177321bd DJ |
4461 | pc += thumb_insn_size (inst1); |
4462 | itstate = thumb_advance_itstate (itstate); | |
4463 | } | |
4464 | ||
50e98be4 | 4465 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4466 | } |
4467 | else if ((itstate & 0x0f) == 0x08) | |
4468 | { | |
4469 | /* This is the last instruction of the conditional | |
4470 | block, and it is executed. We can handle it normally | |
4471 | because the following instruction is not conditional, | |
4472 | and we must handle it normally because it is | |
4473 | permitted to branch. Fall through. */ | |
4474 | } | |
4475 | else | |
4476 | { | |
4477 | int cond_negated; | |
4478 | ||
4479 | /* There are conditional instructions after this one. | |
4480 | If this instruction modifies the flags, then we can | |
4481 | not predict what the next executed instruction will | |
4482 | be. Fortunately, this instruction is architecturally | |
4483 | forbidden to branch; we know it will fall through. | |
4484 | Start by skipping past it. */ | |
4485 | pc += thumb_insn_size (inst1); | |
4486 | itstate = thumb_advance_itstate (itstate); | |
4487 | ||
4488 | /* Set a breakpoint on the following instruction. */ | |
4489 | gdb_assert ((itstate & 0x0f) != 0); | |
18819fa6 UW |
4490 | arm_insert_single_step_breakpoint (gdbarch, aspace, |
4491 | MAKE_THUMB_ADDR (pc)); | |
177321bd DJ |
4492 | cond_negated = (itstate >> 4) & 1; |
4493 | ||
4494 | /* Skip all following instructions with the same | |
4495 | condition. If there is a later instruction in the IT | |
4496 | block with the opposite condition, set the other | |
4497 | breakpoint there. If not, then set a breakpoint on | |
4498 | the instruction after the IT block. */ | |
4499 | do | |
4500 | { | |
0963b4bd MS |
4501 | inst1 = read_memory_unsigned_integer (pc, 2, |
4502 | byte_order_for_code); | |
177321bd DJ |
4503 | pc += thumb_insn_size (inst1); |
4504 | itstate = thumb_advance_itstate (itstate); | |
4505 | } | |
4506 | while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated); | |
4507 | ||
50e98be4 | 4508 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4509 | } |
4510 | } | |
4511 | } | |
4512 | else if (itstate & 0x0f) | |
9dca5578 DJ |
4513 | { |
4514 | /* We are in a conditional block. Check the condition. */ | |
177321bd | 4515 | int cond = itstate >> 4; |
9dca5578 DJ |
4516 | |
4517 | if (! condition_true (cond, status)) | |
db24da6d YQ |
4518 | /* Advance to the next instruction. All the 32-bit |
4519 | instructions share a common prefix. */ | |
4520 | return MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1)); | |
177321bd DJ |
4521 | |
4522 | /* Otherwise, handle the instruction normally. */ | |
9dca5578 DJ |
4523 | } |
4524 | ||
c906108c SS |
4525 | if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */ |
4526 | { | |
4527 | CORE_ADDR sp; | |
4528 | ||
4529 | /* Fetch the saved PC from the stack. It's stored above | |
4530 | all of the other registers. */ | |
f0c9063c | 4531 | offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE; |
0b1b3e42 | 4532 | sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM); |
e17a4113 | 4533 | nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order); |
c906108c SS |
4534 | } |
4535 | else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */ | |
4536 | { | |
c5aa993b | 4537 | unsigned long cond = bits (inst1, 8, 11); |
25b41d01 YQ |
4538 | if (cond == 0x0f) /* 0x0f = SWI */ |
4539 | { | |
4540 | struct gdbarch_tdep *tdep; | |
4541 | tdep = gdbarch_tdep (gdbarch); | |
4542 | ||
4543 | if (tdep->syscall_next_pc != NULL) | |
4544 | nextpc = tdep->syscall_next_pc (frame); | |
4545 | ||
4546 | } | |
4547 | else if (cond != 0x0f && condition_true (cond, status)) | |
c906108c SS |
4548 | nextpc = pc_val + (sbits (inst1, 0, 7) << 1); |
4549 | } | |
4550 | else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */ | |
4551 | { | |
4552 | nextpc = pc_val + (sbits (inst1, 0, 10) << 1); | |
4553 | } | |
db24da6d | 4554 | else if (thumb_insn_size (inst1) == 4) /* 32-bit instruction */ |
c906108c | 4555 | { |
e17a4113 UW |
4556 | unsigned short inst2; |
4557 | inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
9dca5578 DJ |
4558 | |
4559 | /* Default to the next instruction. */ | |
4560 | nextpc = pc + 4; | |
50e98be4 | 4561 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4562 | |
4563 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
4564 | { | |
4565 | /* Branches and miscellaneous control instructions. */ | |
4566 | ||
4567 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
4568 | { | |
4569 | /* B, BL, BLX. */ | |
4570 | int j1, j2, imm1, imm2; | |
4571 | ||
4572 | imm1 = sbits (inst1, 0, 10); | |
4573 | imm2 = bits (inst2, 0, 10); | |
4574 | j1 = bit (inst2, 13); | |
4575 | j2 = bit (inst2, 11); | |
4576 | ||
4577 | offset = ((imm1 << 12) + (imm2 << 1)); | |
4578 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
4579 | ||
4580 | nextpc = pc_val + offset; | |
4581 | /* For BLX make sure to clear the low bits. */ | |
4582 | if (bit (inst2, 12) == 0) | |
4583 | nextpc = nextpc & 0xfffffffc; | |
4584 | } | |
4585 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
4586 | { | |
4587 | /* SUBS PC, LR, #imm8. */ | |
4588 | nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM); | |
4589 | nextpc -= inst2 & 0x00ff; | |
4590 | } | |
4069ebbe | 4591 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) |
9dca5578 DJ |
4592 | { |
4593 | /* Conditional branch. */ | |
4594 | if (condition_true (bits (inst1, 6, 9), status)) | |
4595 | { | |
4596 | int sign, j1, j2, imm1, imm2; | |
4597 | ||
4598 | sign = sbits (inst1, 10, 10); | |
4599 | imm1 = bits (inst1, 0, 5); | |
4600 | imm2 = bits (inst2, 0, 10); | |
4601 | j1 = bit (inst2, 13); | |
4602 | j2 = bit (inst2, 11); | |
4603 | ||
4604 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
4605 | offset += (imm1 << 12) + (imm2 << 1); | |
4606 | ||
4607 | nextpc = pc_val + offset; | |
4608 | } | |
4609 | } | |
4610 | } | |
4611 | else if ((inst1 & 0xfe50) == 0xe810) | |
4612 | { | |
4613 | /* Load multiple or RFE. */ | |
4614 | int rn, offset, load_pc = 1; | |
4615 | ||
4616 | rn = bits (inst1, 0, 3); | |
4617 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
4618 | { | |
4619 | /* LDMIA or POP */ | |
4620 | if (!bit (inst2, 15)) | |
4621 | load_pc = 0; | |
4622 | offset = bitcount (inst2) * 4 - 4; | |
4623 | } | |
4624 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
4625 | { | |
4626 | /* LDMDB */ | |
4627 | if (!bit (inst2, 15)) | |
4628 | load_pc = 0; | |
4629 | offset = -4; | |
4630 | } | |
4631 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
4632 | { | |
4633 | /* RFEIA */ | |
4634 | offset = 0; | |
4635 | } | |
4636 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
4637 | { | |
4638 | /* RFEDB */ | |
4639 | offset = -8; | |
4640 | } | |
4641 | else | |
4642 | load_pc = 0; | |
4643 | ||
4644 | if (load_pc) | |
4645 | { | |
4646 | CORE_ADDR addr = get_frame_register_unsigned (frame, rn); | |
4647 | nextpc = get_frame_memory_unsigned (frame, addr + offset, 4); | |
4648 | } | |
4649 | } | |
4650 | else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
4651 | { | |
4652 | /* MOV PC or MOVS PC. */ | |
4653 | nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); | |
50e98be4 | 4654 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4655 | } |
4656 | else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
4657 | { | |
4658 | /* LDR PC. */ | |
4659 | CORE_ADDR base; | |
4660 | int rn, load_pc = 1; | |
4661 | ||
4662 | rn = bits (inst1, 0, 3); | |
4663 | base = get_frame_register_unsigned (frame, rn); | |
bf9f652a | 4664 | if (rn == ARM_PC_REGNUM) |
9dca5578 DJ |
4665 | { |
4666 | base = (base + 4) & ~(CORE_ADDR) 0x3; | |
4667 | if (bit (inst1, 7)) | |
4668 | base += bits (inst2, 0, 11); | |
4669 | else | |
4670 | base -= bits (inst2, 0, 11); | |
4671 | } | |
4672 | else if (bit (inst1, 7)) | |
4673 | base += bits (inst2, 0, 11); | |
4674 | else if (bit (inst2, 11)) | |
4675 | { | |
4676 | if (bit (inst2, 10)) | |
4677 | { | |
4678 | if (bit (inst2, 9)) | |
4679 | base += bits (inst2, 0, 7); | |
4680 | else | |
4681 | base -= bits (inst2, 0, 7); | |
4682 | } | |
4683 | } | |
4684 | else if ((inst2 & 0x0fc0) == 0x0000) | |
4685 | { | |
4686 | int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3); | |
4687 | base += get_frame_register_unsigned (frame, rm) << shift; | |
4688 | } | |
4689 | else | |
4690 | /* Reserved. */ | |
4691 | load_pc = 0; | |
4692 | ||
4693 | if (load_pc) | |
4694 | nextpc = get_frame_memory_unsigned (frame, base, 4); | |
4695 | } | |
4696 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
4697 | { | |
4698 | /* TBB. */ | |
d476da0e RE |
4699 | CORE_ADDR tbl_reg, table, offset, length; |
4700 | ||
4701 | tbl_reg = bits (inst1, 0, 3); | |
4702 | if (tbl_reg == 0x0f) | |
4703 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4704 | else | |
4705 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4706 | |
9dca5578 DJ |
4707 | offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4708 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 1); | |
4709 | nextpc = pc_val + length; | |
4710 | } | |
d476da0e | 4711 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) |
9dca5578 DJ |
4712 | { |
4713 | /* TBH. */ | |
d476da0e RE |
4714 | CORE_ADDR tbl_reg, table, offset, length; |
4715 | ||
4716 | tbl_reg = bits (inst1, 0, 3); | |
4717 | if (tbl_reg == 0x0f) | |
4718 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4719 | else | |
4720 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4721 | |
9dca5578 DJ |
4722 | offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4723 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 2); | |
4724 | nextpc = pc_val + length; | |
4725 | } | |
c906108c | 4726 | } |
aa17d93e | 4727 | else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */ |
9498281f DJ |
4728 | { |
4729 | if (bits (inst1, 3, 6) == 0x0f) | |
6ca1b147 | 4730 | nextpc = UNMAKE_THUMB_ADDR (pc_val); |
9498281f | 4731 | else |
0b1b3e42 | 4732 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); |
9498281f | 4733 | } |
ad8b5167 UW |
4734 | else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */ |
4735 | { | |
4736 | if (bits (inst1, 3, 6) == 0x0f) | |
4737 | nextpc = pc_val; | |
4738 | else | |
4739 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); | |
4740 | ||
4741 | nextpc = MAKE_THUMB_ADDR (nextpc); | |
4742 | } | |
9dca5578 DJ |
4743 | else if ((inst1 & 0xf500) == 0xb100) |
4744 | { | |
4745 | /* CBNZ or CBZ. */ | |
4746 | int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1); | |
4747 | ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2)); | |
4748 | ||
4749 | if (bit (inst1, 11) && reg != 0) | |
4750 | nextpc = pc_val + imm; | |
4751 | else if (!bit (inst1, 11) && reg == 0) | |
4752 | nextpc = pc_val + imm; | |
4753 | } | |
c906108c SS |
4754 | return nextpc; |
4755 | } | |
4756 | ||
50e98be4 | 4757 | /* Get the raw next address. PC is the current program counter, in |
18819fa6 | 4758 | FRAME, which is assumed to be executing in ARM mode. |
50e98be4 DJ |
4759 | |
4760 | The value returned has the execution state of the next instruction | |
4761 | encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is | |
4762 | in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory | |
0963b4bd MS |
4763 | address. */ |
4764 | ||
50e98be4 | 4765 | static CORE_ADDR |
18819fa6 | 4766 | arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4767 | { |
2af46ca0 | 4768 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
4769 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4770 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c906108c SS |
4771 | unsigned long pc_val; |
4772 | unsigned long this_instr; | |
4773 | unsigned long status; | |
4774 | CORE_ADDR nextpc; | |
4775 | ||
c906108c | 4776 | pc_val = (unsigned long) pc; |
e17a4113 | 4777 | this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
9d4fde75 | 4778 | |
0b1b3e42 | 4779 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
c5aa993b | 4780 | nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */ |
c906108c | 4781 | |
daddc3c1 DJ |
4782 | if (bits (this_instr, 28, 31) == INST_NV) |
4783 | switch (bits (this_instr, 24, 27)) | |
4784 | { | |
4785 | case 0xa: | |
4786 | case 0xb: | |
4787 | { | |
4788 | /* Branch with Link and change to Thumb. */ | |
4789 | nextpc = BranchDest (pc, this_instr); | |
4790 | nextpc |= bit (this_instr, 24) << 1; | |
50e98be4 | 4791 | nextpc = MAKE_THUMB_ADDR (nextpc); |
daddc3c1 DJ |
4792 | break; |
4793 | } | |
4794 | case 0xc: | |
4795 | case 0xd: | |
4796 | case 0xe: | |
4797 | /* Coprocessor register transfer. */ | |
4798 | if (bits (this_instr, 12, 15) == 15) | |
4799 | error (_("Invalid update to pc in instruction")); | |
4800 | break; | |
4801 | } | |
4802 | else if (condition_true (bits (this_instr, 28, 31), status)) | |
c906108c SS |
4803 | { |
4804 | switch (bits (this_instr, 24, 27)) | |
4805 | { | |
c5aa993b | 4806 | case 0x0: |
94c30b78 | 4807 | case 0x1: /* data processing */ |
c5aa993b JM |
4808 | case 0x2: |
4809 | case 0x3: | |
c906108c SS |
4810 | { |
4811 | unsigned long operand1, operand2, result = 0; | |
4812 | unsigned long rn; | |
4813 | int c; | |
c5aa993b | 4814 | |
c906108c SS |
4815 | if (bits (this_instr, 12, 15) != 15) |
4816 | break; | |
4817 | ||
4818 | if (bits (this_instr, 22, 25) == 0 | |
c5aa993b | 4819 | && bits (this_instr, 4, 7) == 9) /* multiply */ |
edefbb7c | 4820 | error (_("Invalid update to pc in instruction")); |
c906108c | 4821 | |
9498281f | 4822 | /* BX <reg>, BLX <reg> */ |
e150acc7 PB |
4823 | if (bits (this_instr, 4, 27) == 0x12fff1 |
4824 | || bits (this_instr, 4, 27) == 0x12fff3) | |
9498281f DJ |
4825 | { |
4826 | rn = bits (this_instr, 0, 3); | |
bf9f652a YQ |
4827 | nextpc = ((rn == ARM_PC_REGNUM) |
4828 | ? (pc_val + 8) | |
4829 | : get_frame_register_unsigned (frame, rn)); | |
4830 | ||
9498281f DJ |
4831 | return nextpc; |
4832 | } | |
4833 | ||
0963b4bd | 4834 | /* Multiply into PC. */ |
c906108c SS |
4835 | c = (status & FLAG_C) ? 1 : 0; |
4836 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4837 | operand1 = ((rn == ARM_PC_REGNUM) |
4838 | ? (pc_val + 8) | |
4839 | : get_frame_register_unsigned (frame, rn)); | |
c5aa993b | 4840 | |
c906108c SS |
4841 | if (bit (this_instr, 25)) |
4842 | { | |
4843 | unsigned long immval = bits (this_instr, 0, 7); | |
4844 | unsigned long rotate = 2 * bits (this_instr, 8, 11); | |
c5aa993b JM |
4845 | operand2 = ((immval >> rotate) | (immval << (32 - rotate))) |
4846 | & 0xffffffff; | |
c906108c | 4847 | } |
0963b4bd MS |
4848 | else /* operand 2 is a shifted register. */ |
4849 | operand2 = shifted_reg_val (frame, this_instr, c, | |
4850 | pc_val, status); | |
c5aa993b | 4851 | |
c906108c SS |
4852 | switch (bits (this_instr, 21, 24)) |
4853 | { | |
c5aa993b | 4854 | case 0x0: /*and */ |
c906108c SS |
4855 | result = operand1 & operand2; |
4856 | break; | |
4857 | ||
c5aa993b | 4858 | case 0x1: /*eor */ |
c906108c SS |
4859 | result = operand1 ^ operand2; |
4860 | break; | |
4861 | ||
c5aa993b | 4862 | case 0x2: /*sub */ |
c906108c SS |
4863 | result = operand1 - operand2; |
4864 | break; | |
4865 | ||
c5aa993b | 4866 | case 0x3: /*rsb */ |
c906108c SS |
4867 | result = operand2 - operand1; |
4868 | break; | |
4869 | ||
c5aa993b | 4870 | case 0x4: /*add */ |
c906108c SS |
4871 | result = operand1 + operand2; |
4872 | break; | |
4873 | ||
c5aa993b | 4874 | case 0x5: /*adc */ |
c906108c SS |
4875 | result = operand1 + operand2 + c; |
4876 | break; | |
4877 | ||
c5aa993b | 4878 | case 0x6: /*sbc */ |
c906108c SS |
4879 | result = operand1 - operand2 + c; |
4880 | break; | |
4881 | ||
c5aa993b | 4882 | case 0x7: /*rsc */ |
c906108c SS |
4883 | result = operand2 - operand1 + c; |
4884 | break; | |
4885 | ||
c5aa993b JM |
4886 | case 0x8: |
4887 | case 0x9: | |
4888 | case 0xa: | |
4889 | case 0xb: /* tst, teq, cmp, cmn */ | |
c906108c SS |
4890 | result = (unsigned long) nextpc; |
4891 | break; | |
4892 | ||
c5aa993b | 4893 | case 0xc: /*orr */ |
c906108c SS |
4894 | result = operand1 | operand2; |
4895 | break; | |
4896 | ||
c5aa993b | 4897 | case 0xd: /*mov */ |
c906108c SS |
4898 | /* Always step into a function. */ |
4899 | result = operand2; | |
c5aa993b | 4900 | break; |
c906108c | 4901 | |
c5aa993b | 4902 | case 0xe: /*bic */ |
c906108c SS |
4903 | result = operand1 & ~operand2; |
4904 | break; | |
4905 | ||
c5aa993b | 4906 | case 0xf: /*mvn */ |
c906108c SS |
4907 | result = ~operand2; |
4908 | break; | |
4909 | } | |
c906108c | 4910 | |
50e98be4 DJ |
4911 | /* In 26-bit APCS the bottom two bits of the result are |
4912 | ignored, and we always end up in ARM state. */ | |
4913 | if (!arm_apcs_32) | |
4914 | nextpc = arm_addr_bits_remove (gdbarch, result); | |
4915 | else | |
4916 | nextpc = result; | |
4917 | ||
c906108c SS |
4918 | break; |
4919 | } | |
c5aa993b JM |
4920 | |
4921 | case 0x4: | |
4922 | case 0x5: /* data transfer */ | |
4923 | case 0x6: | |
4924 | case 0x7: | |
c906108c SS |
4925 | if (bit (this_instr, 20)) |
4926 | { | |
4927 | /* load */ | |
4928 | if (bits (this_instr, 12, 15) == 15) | |
4929 | { | |
4930 | /* rd == pc */ | |
c5aa993b | 4931 | unsigned long rn; |
c906108c | 4932 | unsigned long base; |
c5aa993b | 4933 | |
c906108c | 4934 | if (bit (this_instr, 22)) |
edefbb7c | 4935 | error (_("Invalid update to pc in instruction")); |
c906108c SS |
4936 | |
4937 | /* byte write to PC */ | |
4938 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4939 | base = ((rn == ARM_PC_REGNUM) |
4940 | ? (pc_val + 8) | |
4941 | : get_frame_register_unsigned (frame, rn)); | |
4942 | ||
c906108c SS |
4943 | if (bit (this_instr, 24)) |
4944 | { | |
4945 | /* pre-indexed */ | |
4946 | int c = (status & FLAG_C) ? 1 : 0; | |
4947 | unsigned long offset = | |
c5aa993b | 4948 | (bit (this_instr, 25) |
0b1b3e42 | 4949 | ? shifted_reg_val (frame, this_instr, c, pc_val, status) |
c5aa993b | 4950 | : bits (this_instr, 0, 11)); |
c906108c SS |
4951 | |
4952 | if (bit (this_instr, 23)) | |
4953 | base += offset; | |
4954 | else | |
4955 | base -= offset; | |
4956 | } | |
51370a33 YQ |
4957 | nextpc = |
4958 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) base, | |
4959 | 4, byte_order); | |
c906108c SS |
4960 | } |
4961 | } | |
4962 | break; | |
c5aa993b JM |
4963 | |
4964 | case 0x8: | |
4965 | case 0x9: /* block transfer */ | |
c906108c SS |
4966 | if (bit (this_instr, 20)) |
4967 | { | |
4968 | /* LDM */ | |
4969 | if (bit (this_instr, 15)) | |
4970 | { | |
4971 | /* loading pc */ | |
4972 | int offset = 0; | |
51370a33 YQ |
4973 | unsigned long rn_val |
4974 | = get_frame_register_unsigned (frame, | |
4975 | bits (this_instr, 16, 19)); | |
c906108c SS |
4976 | |
4977 | if (bit (this_instr, 23)) | |
4978 | { | |
4979 | /* up */ | |
4980 | unsigned long reglist = bits (this_instr, 0, 14); | |
4981 | offset = bitcount (reglist) * 4; | |
c5aa993b | 4982 | if (bit (this_instr, 24)) /* pre */ |
c906108c SS |
4983 | offset += 4; |
4984 | } | |
4985 | else if (bit (this_instr, 24)) | |
4986 | offset = -4; | |
c5aa993b | 4987 | |
51370a33 YQ |
4988 | nextpc = |
4989 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) | |
4990 | (rn_val + offset), | |
4991 | 4, byte_order); | |
c906108c SS |
4992 | } |
4993 | } | |
4994 | break; | |
c5aa993b JM |
4995 | |
4996 | case 0xb: /* branch & link */ | |
4997 | case 0xa: /* branch */ | |
c906108c SS |
4998 | { |
4999 | nextpc = BranchDest (pc, this_instr); | |
c906108c SS |
5000 | break; |
5001 | } | |
c5aa993b JM |
5002 | |
5003 | case 0xc: | |
5004 | case 0xd: | |
5005 | case 0xe: /* coproc ops */ | |
25b41d01 | 5006 | break; |
c5aa993b | 5007 | case 0xf: /* SWI */ |
25b41d01 YQ |
5008 | { |
5009 | struct gdbarch_tdep *tdep; | |
5010 | tdep = gdbarch_tdep (gdbarch); | |
5011 | ||
5012 | if (tdep->syscall_next_pc != NULL) | |
5013 | nextpc = tdep->syscall_next_pc (frame); | |
5014 | ||
5015 | } | |
c906108c SS |
5016 | break; |
5017 | ||
5018 | default: | |
edefbb7c | 5019 | fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n")); |
c906108c SS |
5020 | return (pc); |
5021 | } | |
5022 | } | |
5023 | ||
5024 | return nextpc; | |
5025 | } | |
5026 | ||
18819fa6 UW |
5027 | /* Determine next PC after current instruction executes. Will call either |
5028 | arm_get_next_pc_raw or thumb_get_next_pc_raw. Error out if infinite | |
5029 | loop is detected. */ | |
5030 | ||
50e98be4 DJ |
5031 | CORE_ADDR |
5032 | arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc) | |
5033 | { | |
18819fa6 UW |
5034 | CORE_ADDR nextpc; |
5035 | ||
5036 | if (arm_frame_is_thumb (frame)) | |
2b59118e | 5037 | nextpc = thumb_get_next_pc_raw (frame, pc); |
18819fa6 | 5038 | else |
2b59118e | 5039 | nextpc = arm_get_next_pc_raw (frame, pc); |
18819fa6 | 5040 | |
50e98be4 DJ |
5041 | return nextpc; |
5042 | } | |
5043 | ||
18819fa6 UW |
5044 | /* Like insert_single_step_breakpoint, but make sure we use a breakpoint |
5045 | of the appropriate mode (as encoded in the PC value), even if this | |
5046 | differs from what would be expected according to the symbol tables. */ | |
5047 | ||
5048 | void | |
5049 | arm_insert_single_step_breakpoint (struct gdbarch *gdbarch, | |
5050 | struct address_space *aspace, | |
5051 | CORE_ADDR pc) | |
5052 | { | |
5053 | struct cleanup *old_chain | |
5054 | = make_cleanup_restore_integer (&arm_override_mode); | |
5055 | ||
5056 | arm_override_mode = IS_THUMB_ADDR (pc); | |
5057 | pc = gdbarch_addr_bits_remove (gdbarch, pc); | |
5058 | ||
5059 | insert_single_step_breakpoint (gdbarch, aspace, pc); | |
5060 | ||
5061 | do_cleanups (old_chain); | |
5062 | } | |
5063 | ||
35f73cfc UW |
5064 | /* Checks for an atomic sequence of instructions beginning with a LDREX{,B,H,D} |
5065 | instruction and ending with a STREX{,B,H,D} instruction. If such a sequence | |
5066 | is found, attempt to step through it. A breakpoint is placed at the end of | |
5067 | the sequence. */ | |
5068 | ||
5069 | static int | |
5070 | thumb_deal_with_atomic_sequence_raw (struct frame_info *frame) | |
5071 | { | |
5072 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
5073 | struct address_space *aspace = get_frame_address_space (frame); | |
5074 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
5075 | CORE_ADDR pc = get_frame_pc (frame); | |
5076 | CORE_ADDR breaks[2] = {-1, -1}; | |
5077 | CORE_ADDR loc = pc; | |
5078 | unsigned short insn1, insn2; | |
5079 | int insn_count; | |
5080 | int index; | |
5081 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ | |
5082 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ | |
5083 | ULONGEST status, itstate; | |
5084 | ||
5085 | /* We currently do not support atomic sequences within an IT block. */ | |
5086 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
5087 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); | |
5088 | if (itstate & 0x0f) | |
5089 | return 0; | |
5090 | ||
5091 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. */ | |
5092 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5093 | loc += 2; | |
5094 | if (thumb_insn_size (insn1) != 4) | |
5095 | return 0; | |
5096 | ||
5097 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5098 | loc += 2; | |
5099 | if (!((insn1 & 0xfff0) == 0xe850 | |
5100 | || ((insn1 & 0xfff0) == 0xe8d0 && (insn2 & 0x00c0) == 0x0040))) | |
5101 | return 0; | |
5102 | ||
5103 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" | |
5104 | instructions. */ | |
5105 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) | |
5106 | { | |
5107 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5108 | loc += 2; | |
5109 | ||
5110 | if (thumb_insn_size (insn1) != 4) | |
5111 | { | |
5112 | /* Assume that there is at most one conditional branch in the | |
5113 | atomic sequence. If a conditional branch is found, put a | |
5114 | breakpoint in its destination address. */ | |
5115 | if ((insn1 & 0xf000) == 0xd000 && bits (insn1, 8, 11) != 0x0f) | |
5116 | { | |
5117 | if (last_breakpoint > 0) | |
5118 | return 0; /* More than one conditional branch found, | |
5119 | fallback to the standard code. */ | |
5120 | ||
5121 | breaks[1] = loc + 2 + (sbits (insn1, 0, 7) << 1); | |
5122 | last_breakpoint++; | |
5123 | } | |
5124 | ||
5125 | /* We do not support atomic sequences that use any *other* | |
5126 | instructions but conditional branches to change the PC. | |
5127 | Fall back to standard code to avoid losing control of | |
5128 | execution. */ | |
5129 | else if (thumb_instruction_changes_pc (insn1)) | |
5130 | return 0; | |
5131 | } | |
5132 | else | |
5133 | { | |
5134 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5135 | loc += 2; | |
5136 | ||
5137 | /* Assume that there is at most one conditional branch in the | |
5138 | atomic sequence. If a conditional branch is found, put a | |
5139 | breakpoint in its destination address. */ | |
5140 | if ((insn1 & 0xf800) == 0xf000 | |
5141 | && (insn2 & 0xd000) == 0x8000 | |
5142 | && (insn1 & 0x0380) != 0x0380) | |
5143 | { | |
5144 | int sign, j1, j2, imm1, imm2; | |
5145 | unsigned int offset; | |
5146 | ||
5147 | sign = sbits (insn1, 10, 10); | |
5148 | imm1 = bits (insn1, 0, 5); | |
5149 | imm2 = bits (insn2, 0, 10); | |
5150 | j1 = bit (insn2, 13); | |
5151 | j2 = bit (insn2, 11); | |
5152 | ||
5153 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
5154 | offset += (imm1 << 12) + (imm2 << 1); | |
5155 | ||
5156 | if (last_breakpoint > 0) | |
5157 | return 0; /* More than one conditional branch found, | |
5158 | fallback to the standard code. */ | |
5159 | ||
5160 | breaks[1] = loc + offset; | |
5161 | last_breakpoint++; | |
5162 | } | |
5163 | ||
5164 | /* We do not support atomic sequences that use any *other* | |
5165 | instructions but conditional branches to change the PC. | |
5166 | Fall back to standard code to avoid losing control of | |
5167 | execution. */ | |
5168 | else if (thumb2_instruction_changes_pc (insn1, insn2)) | |
5169 | return 0; | |
5170 | ||
5171 | /* If we find a strex{,b,h,d}, we're done. */ | |
5172 | if ((insn1 & 0xfff0) == 0xe840 | |
5173 | || ((insn1 & 0xfff0) == 0xe8c0 && (insn2 & 0x00c0) == 0x0040)) | |
5174 | break; | |
5175 | } | |
5176 | } | |
5177 | ||
5178 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ | |
5179 | if (insn_count == atomic_sequence_length) | |
5180 | return 0; | |
5181 | ||
5182 | /* Insert a breakpoint right after the end of the atomic sequence. */ | |
5183 | breaks[0] = loc; | |
5184 | ||
5185 | /* Check for duplicated breakpoints. Check also for a breakpoint | |
5186 | placed (branch instruction's destination) anywhere in sequence. */ | |
5187 | if (last_breakpoint | |
5188 | && (breaks[1] == breaks[0] | |
5189 | || (breaks[1] >= pc && breaks[1] < loc))) | |
5190 | last_breakpoint = 0; | |
5191 | ||
5192 | /* Effectively inserts the breakpoints. */ | |
5193 | for (index = 0; index <= last_breakpoint; index++) | |
5194 | arm_insert_single_step_breakpoint (gdbarch, aspace, | |
5195 | MAKE_THUMB_ADDR (breaks[index])); | |
5196 | ||
5197 | return 1; | |
5198 | } | |
5199 | ||
5200 | static int | |
5201 | arm_deal_with_atomic_sequence_raw (struct frame_info *frame) | |
5202 | { | |
5203 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
5204 | struct address_space *aspace = get_frame_address_space (frame); | |
5205 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
5206 | CORE_ADDR pc = get_frame_pc (frame); | |
5207 | CORE_ADDR breaks[2] = {-1, -1}; | |
5208 | CORE_ADDR loc = pc; | |
5209 | unsigned int insn; | |
5210 | int insn_count; | |
5211 | int index; | |
5212 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ | |
5213 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ | |
5214 | ||
5215 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. | |
5216 | Note that we do not currently support conditionally executed atomic | |
5217 | instructions. */ | |
5218 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); | |
5219 | loc += 4; | |
5220 | if ((insn & 0xff9000f0) != 0xe1900090) | |
5221 | return 0; | |
5222 | ||
5223 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" | |
5224 | instructions. */ | |
5225 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) | |
5226 | { | |
5227 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); | |
5228 | loc += 4; | |
5229 | ||
5230 | /* Assume that there is at most one conditional branch in the atomic | |
5231 | sequence. If a conditional branch is found, put a breakpoint in | |
5232 | its destination address. */ | |
5233 | if (bits (insn, 24, 27) == 0xa) | |
5234 | { | |
5235 | if (last_breakpoint > 0) | |
5236 | return 0; /* More than one conditional branch found, fallback | |
5237 | to the standard single-step code. */ | |
5238 | ||
5239 | breaks[1] = BranchDest (loc - 4, insn); | |
5240 | last_breakpoint++; | |
5241 | } | |
5242 | ||
5243 | /* We do not support atomic sequences that use any *other* instructions | |
5244 | but conditional branches to change the PC. Fall back to standard | |
5245 | code to avoid losing control of execution. */ | |
5246 | else if (arm_instruction_changes_pc (insn)) | |
5247 | return 0; | |
5248 | ||
5249 | /* If we find a strex{,b,h,d}, we're done. */ | |
5250 | if ((insn & 0xff9000f0) == 0xe1800090) | |
5251 | break; | |
5252 | } | |
5253 | ||
5254 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ | |
5255 | if (insn_count == atomic_sequence_length) | |
5256 | return 0; | |
5257 | ||
5258 | /* Insert a breakpoint right after the end of the atomic sequence. */ | |
5259 | breaks[0] = loc; | |
5260 | ||
5261 | /* Check for duplicated breakpoints. Check also for a breakpoint | |
5262 | placed (branch instruction's destination) anywhere in sequence. */ | |
5263 | if (last_breakpoint | |
5264 | && (breaks[1] == breaks[0] | |
5265 | || (breaks[1] >= pc && breaks[1] < loc))) | |
5266 | last_breakpoint = 0; | |
5267 | ||
5268 | /* Effectively inserts the breakpoints. */ | |
5269 | for (index = 0; index <= last_breakpoint; index++) | |
5270 | arm_insert_single_step_breakpoint (gdbarch, aspace, breaks[index]); | |
5271 | ||
5272 | return 1; | |
5273 | } | |
5274 | ||
5275 | int | |
5276 | arm_deal_with_atomic_sequence (struct frame_info *frame) | |
5277 | { | |
5278 | if (arm_frame_is_thumb (frame)) | |
5279 | return thumb_deal_with_atomic_sequence_raw (frame); | |
5280 | else | |
5281 | return arm_deal_with_atomic_sequence_raw (frame); | |
5282 | } | |
5283 | ||
9512d7fd FN |
5284 | /* single_step() is called just before we want to resume the inferior, |
5285 | if we want to single-step it but there is no hardware or kernel | |
5286 | single-step support. We find the target of the coming instruction | |
e0cd558a | 5287 | and breakpoint it. */ |
9512d7fd | 5288 | |
190dce09 | 5289 | int |
0b1b3e42 | 5290 | arm_software_single_step (struct frame_info *frame) |
9512d7fd | 5291 | { |
a6d9a66e | 5292 | struct gdbarch *gdbarch = get_frame_arch (frame); |
6c95b8df | 5293 | struct address_space *aspace = get_frame_address_space (frame); |
35f73cfc UW |
5294 | CORE_ADDR next_pc; |
5295 | ||
5296 | if (arm_deal_with_atomic_sequence (frame)) | |
5297 | return 1; | |
18819fa6 | 5298 | |
35f73cfc | 5299 | next_pc = arm_get_next_pc (frame, get_frame_pc (frame)); |
18819fa6 | 5300 | arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc); |
e6590a1b UW |
5301 | |
5302 | return 1; | |
9512d7fd | 5303 | } |
9512d7fd | 5304 | |
f9d67f43 DJ |
5305 | /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand |
5306 | the buffer to be NEW_LEN bytes ending at ENDADDR. Return | |
5307 | NULL if an error occurs. BUF is freed. */ | |
5308 | ||
5309 | static gdb_byte * | |
5310 | extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr, | |
5311 | int old_len, int new_len) | |
5312 | { | |
22e048c9 | 5313 | gdb_byte *new_buf; |
f9d67f43 DJ |
5314 | int bytes_to_read = new_len - old_len; |
5315 | ||
5316 | new_buf = xmalloc (new_len); | |
5317 | memcpy (new_buf + bytes_to_read, buf, old_len); | |
5318 | xfree (buf); | |
5319 | if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0) | |
5320 | { | |
5321 | xfree (new_buf); | |
5322 | return NULL; | |
5323 | } | |
5324 | return new_buf; | |
5325 | } | |
5326 | ||
5327 | /* An IT block is at most the 2-byte IT instruction followed by | |
5328 | four 4-byte instructions. The furthest back we must search to | |
5329 | find an IT block that affects the current instruction is thus | |
5330 | 2 + 3 * 4 == 14 bytes. */ | |
5331 | #define MAX_IT_BLOCK_PREFIX 14 | |
5332 | ||
5333 | /* Use a quick scan if there are more than this many bytes of | |
5334 | code. */ | |
5335 | #define IT_SCAN_THRESHOLD 32 | |
5336 | ||
5337 | /* Adjust a breakpoint's address to move breakpoints out of IT blocks. | |
5338 | A breakpoint in an IT block may not be hit, depending on the | |
5339 | condition flags. */ | |
5340 | static CORE_ADDR | |
5341 | arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr) | |
5342 | { | |
5343 | gdb_byte *buf; | |
5344 | char map_type; | |
5345 | CORE_ADDR boundary, func_start; | |
22e048c9 | 5346 | int buf_len; |
f9d67f43 DJ |
5347 | enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch); |
5348 | int i, any, last_it, last_it_count; | |
5349 | ||
5350 | /* If we are using BKPT breakpoints, none of this is necessary. */ | |
5351 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL) | |
5352 | return bpaddr; | |
5353 | ||
5354 | /* ARM mode does not have this problem. */ | |
9779414d | 5355 | if (!arm_pc_is_thumb (gdbarch, bpaddr)) |
f9d67f43 DJ |
5356 | return bpaddr; |
5357 | ||
5358 | /* We are setting a breakpoint in Thumb code that could potentially | |
5359 | contain an IT block. The first step is to find how much Thumb | |
5360 | code there is; we do not need to read outside of known Thumb | |
5361 | sequences. */ | |
5362 | map_type = arm_find_mapping_symbol (bpaddr, &boundary); | |
5363 | if (map_type == 0) | |
5364 | /* Thumb-2 code must have mapping symbols to have a chance. */ | |
5365 | return bpaddr; | |
5366 | ||
5367 | bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr); | |
5368 | ||
5369 | if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL) | |
5370 | && func_start > boundary) | |
5371 | boundary = func_start; | |
5372 | ||
5373 | /* Search for a candidate IT instruction. We have to do some fancy | |
5374 | footwork to distinguish a real IT instruction from the second | |
5375 | half of a 32-bit instruction, but there is no need for that if | |
5376 | there's no candidate. */ | |
5377 | buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX); | |
5378 | if (buf_len == 0) | |
5379 | /* No room for an IT instruction. */ | |
5380 | return bpaddr; | |
5381 | ||
5382 | buf = xmalloc (buf_len); | |
5383 | if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0) | |
5384 | return bpaddr; | |
5385 | any = 0; | |
5386 | for (i = 0; i < buf_len; i += 2) | |
5387 | { | |
5388 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5389 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5390 | { | |
5391 | any = 1; | |
5392 | break; | |
5393 | } | |
5394 | } | |
5395 | if (any == 0) | |
5396 | { | |
5397 | xfree (buf); | |
5398 | return bpaddr; | |
5399 | } | |
5400 | ||
5401 | /* OK, the code bytes before this instruction contain at least one | |
5402 | halfword which resembles an IT instruction. We know that it's | |
5403 | Thumb code, but there are still two possibilities. Either the | |
5404 | halfword really is an IT instruction, or it is the second half of | |
5405 | a 32-bit Thumb instruction. The only way we can tell is to | |
5406 | scan forwards from a known instruction boundary. */ | |
5407 | if (bpaddr - boundary > IT_SCAN_THRESHOLD) | |
5408 | { | |
5409 | int definite; | |
5410 | ||
5411 | /* There's a lot of code before this instruction. Start with an | |
5412 | optimistic search; it's easy to recognize halfwords that can | |
5413 | not be the start of a 32-bit instruction, and use that to | |
5414 | lock on to the instruction boundaries. */ | |
5415 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD); | |
5416 | if (buf == NULL) | |
5417 | return bpaddr; | |
5418 | buf_len = IT_SCAN_THRESHOLD; | |
5419 | ||
5420 | definite = 0; | |
5421 | for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2) | |
5422 | { | |
5423 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5424 | if (thumb_insn_size (inst1) == 2) | |
5425 | { | |
5426 | definite = 1; | |
5427 | break; | |
5428 | } | |
5429 | } | |
5430 | ||
5431 | /* At this point, if DEFINITE, BUF[I] is the first place we | |
5432 | are sure that we know the instruction boundaries, and it is far | |
5433 | enough from BPADDR that we could not miss an IT instruction | |
5434 | affecting BPADDR. If ! DEFINITE, give up - start from a | |
5435 | known boundary. */ | |
5436 | if (! definite) | |
5437 | { | |
0963b4bd MS |
5438 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, |
5439 | bpaddr - boundary); | |
f9d67f43 DJ |
5440 | if (buf == NULL) |
5441 | return bpaddr; | |
5442 | buf_len = bpaddr - boundary; | |
5443 | i = 0; | |
5444 | } | |
5445 | } | |
5446 | else | |
5447 | { | |
5448 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary); | |
5449 | if (buf == NULL) | |
5450 | return bpaddr; | |
5451 | buf_len = bpaddr - boundary; | |
5452 | i = 0; | |
5453 | } | |
5454 | ||
5455 | /* Scan forwards. Find the last IT instruction before BPADDR. */ | |
5456 | last_it = -1; | |
5457 | last_it_count = 0; | |
5458 | while (i < buf_len) | |
5459 | { | |
5460 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5461 | last_it_count--; | |
5462 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5463 | { | |
5464 | last_it = i; | |
5465 | if (inst1 & 0x0001) | |
5466 | last_it_count = 4; | |
5467 | else if (inst1 & 0x0002) | |
5468 | last_it_count = 3; | |
5469 | else if (inst1 & 0x0004) | |
5470 | last_it_count = 2; | |
5471 | else | |
5472 | last_it_count = 1; | |
5473 | } | |
5474 | i += thumb_insn_size (inst1); | |
5475 | } | |
5476 | ||
5477 | xfree (buf); | |
5478 | ||
5479 | if (last_it == -1) | |
5480 | /* There wasn't really an IT instruction after all. */ | |
5481 | return bpaddr; | |
5482 | ||
5483 | if (last_it_count < 1) | |
5484 | /* It was too far away. */ | |
5485 | return bpaddr; | |
5486 | ||
5487 | /* This really is a trouble spot. Move the breakpoint to the IT | |
5488 | instruction. */ | |
5489 | return bpaddr - buf_len + last_it; | |
5490 | } | |
5491 | ||
cca44b1b | 5492 | /* ARM displaced stepping support. |
c906108c | 5493 | |
cca44b1b | 5494 | Generally ARM displaced stepping works as follows: |
c906108c | 5495 | |
cca44b1b JB |
5496 | 1. When an instruction is to be single-stepped, it is first decoded by |
5497 | arm_process_displaced_insn (called from arm_displaced_step_copy_insn). | |
5498 | Depending on the type of instruction, it is then copied to a scratch | |
5499 | location, possibly in a modified form. The copy_* set of functions | |
0963b4bd | 5500 | performs such modification, as necessary. A breakpoint is placed after |
cca44b1b JB |
5501 | the modified instruction in the scratch space to return control to GDB. |
5502 | Note in particular that instructions which modify the PC will no longer | |
5503 | do so after modification. | |
c5aa993b | 5504 | |
cca44b1b JB |
5505 | 2. The instruction is single-stepped, by setting the PC to the scratch |
5506 | location address, and resuming. Control returns to GDB when the | |
5507 | breakpoint is hit. | |
c5aa993b | 5508 | |
cca44b1b JB |
5509 | 3. A cleanup function (cleanup_*) is called corresponding to the copy_* |
5510 | function used for the current instruction. This function's job is to | |
5511 | put the CPU/memory state back to what it would have been if the | |
5512 | instruction had been executed unmodified in its original location. */ | |
c5aa993b | 5513 | |
cca44b1b JB |
5514 | /* NOP instruction (mov r0, r0). */ |
5515 | #define ARM_NOP 0xe1a00000 | |
34518530 | 5516 | #define THUMB_NOP 0x4600 |
cca44b1b JB |
5517 | |
5518 | /* Helper for register reads for displaced stepping. In particular, this | |
5519 | returns the PC as it would be seen by the instruction at its original | |
5520 | location. */ | |
5521 | ||
5522 | ULONGEST | |
36073a92 YQ |
5523 | displaced_read_reg (struct regcache *regs, struct displaced_step_closure *dsc, |
5524 | int regno) | |
cca44b1b JB |
5525 | { |
5526 | ULONGEST ret; | |
36073a92 | 5527 | CORE_ADDR from = dsc->insn_addr; |
cca44b1b | 5528 | |
bf9f652a | 5529 | if (regno == ARM_PC_REGNUM) |
cca44b1b | 5530 | { |
4db71c0b YQ |
5531 | /* Compute pipeline offset: |
5532 | - When executing an ARM instruction, PC reads as the address of the | |
5533 | current instruction plus 8. | |
5534 | - When executing a Thumb instruction, PC reads as the address of the | |
5535 | current instruction plus 4. */ | |
5536 | ||
36073a92 | 5537 | if (!dsc->is_thumb) |
4db71c0b YQ |
5538 | from += 8; |
5539 | else | |
5540 | from += 4; | |
5541 | ||
cca44b1b JB |
5542 | if (debug_displaced) |
5543 | fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n", | |
4db71c0b YQ |
5544 | (unsigned long) from); |
5545 | return (ULONGEST) from; | |
cca44b1b | 5546 | } |
c906108c | 5547 | else |
cca44b1b JB |
5548 | { |
5549 | regcache_cooked_read_unsigned (regs, regno, &ret); | |
5550 | if (debug_displaced) | |
5551 | fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n", | |
5552 | regno, (unsigned long) ret); | |
5553 | return ret; | |
5554 | } | |
c906108c SS |
5555 | } |
5556 | ||
cca44b1b JB |
5557 | static int |
5558 | displaced_in_arm_mode (struct regcache *regs) | |
5559 | { | |
5560 | ULONGEST ps; | |
9779414d | 5561 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
66e810cd | 5562 | |
cca44b1b | 5563 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
66e810cd | 5564 | |
9779414d | 5565 | return (ps & t_bit) == 0; |
cca44b1b | 5566 | } |
66e810cd | 5567 | |
cca44b1b | 5568 | /* Write to the PC as from a branch instruction. */ |
c906108c | 5569 | |
cca44b1b | 5570 | static void |
36073a92 YQ |
5571 | branch_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5572 | ULONGEST val) | |
c906108c | 5573 | { |
36073a92 | 5574 | if (!dsc->is_thumb) |
cca44b1b JB |
5575 | /* Note: If bits 0/1 are set, this branch would be unpredictable for |
5576 | architecture versions < 6. */ | |
0963b4bd MS |
5577 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5578 | val & ~(ULONGEST) 0x3); | |
cca44b1b | 5579 | else |
0963b4bd MS |
5580 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5581 | val & ~(ULONGEST) 0x1); | |
cca44b1b | 5582 | } |
66e810cd | 5583 | |
cca44b1b JB |
5584 | /* Write to the PC as from a branch-exchange instruction. */ |
5585 | ||
5586 | static void | |
5587 | bx_write_pc (struct regcache *regs, ULONGEST val) | |
5588 | { | |
5589 | ULONGEST ps; | |
9779414d | 5590 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
cca44b1b JB |
5591 | |
5592 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); | |
5593 | ||
5594 | if ((val & 1) == 1) | |
c906108c | 5595 | { |
9779414d | 5596 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit); |
cca44b1b JB |
5597 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe); |
5598 | } | |
5599 | else if ((val & 2) == 0) | |
5600 | { | |
9779414d | 5601 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5602 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val); |
c906108c SS |
5603 | } |
5604 | else | |
5605 | { | |
cca44b1b JB |
5606 | /* Unpredictable behaviour. Try to do something sensible (switch to ARM |
5607 | mode, align dest to 4 bytes). */ | |
5608 | warning (_("Single-stepping BX to non-word-aligned ARM instruction.")); | |
9779414d | 5609 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5610 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc); |
c906108c SS |
5611 | } |
5612 | } | |
ed9a39eb | 5613 | |
cca44b1b | 5614 | /* Write to the PC as if from a load instruction. */ |
ed9a39eb | 5615 | |
34e8f22d | 5616 | static void |
36073a92 YQ |
5617 | load_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5618 | ULONGEST val) | |
ed9a39eb | 5619 | { |
cca44b1b JB |
5620 | if (DISPLACED_STEPPING_ARCH_VERSION >= 5) |
5621 | bx_write_pc (regs, val); | |
5622 | else | |
36073a92 | 5623 | branch_write_pc (regs, dsc, val); |
cca44b1b | 5624 | } |
be8626e0 | 5625 | |
cca44b1b JB |
5626 | /* Write to the PC as if from an ALU instruction. */ |
5627 | ||
5628 | static void | |
36073a92 YQ |
5629 | alu_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5630 | ULONGEST val) | |
cca44b1b | 5631 | { |
36073a92 | 5632 | if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb) |
cca44b1b JB |
5633 | bx_write_pc (regs, val); |
5634 | else | |
36073a92 | 5635 | branch_write_pc (regs, dsc, val); |
cca44b1b JB |
5636 | } |
5637 | ||
5638 | /* Helper for writing to registers for displaced stepping. Writing to the PC | |
5639 | has a varying effects depending on the instruction which does the write: | |
5640 | this is controlled by the WRITE_PC argument. */ | |
5641 | ||
5642 | void | |
5643 | displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc, | |
5644 | int regno, ULONGEST val, enum pc_write_style write_pc) | |
5645 | { | |
bf9f652a | 5646 | if (regno == ARM_PC_REGNUM) |
08216dd7 | 5647 | { |
cca44b1b JB |
5648 | if (debug_displaced) |
5649 | fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n", | |
5650 | (unsigned long) val); | |
5651 | switch (write_pc) | |
08216dd7 | 5652 | { |
cca44b1b | 5653 | case BRANCH_WRITE_PC: |
36073a92 | 5654 | branch_write_pc (regs, dsc, val); |
08216dd7 RE |
5655 | break; |
5656 | ||
cca44b1b JB |
5657 | case BX_WRITE_PC: |
5658 | bx_write_pc (regs, val); | |
5659 | break; | |
5660 | ||
5661 | case LOAD_WRITE_PC: | |
36073a92 | 5662 | load_write_pc (regs, dsc, val); |
cca44b1b JB |
5663 | break; |
5664 | ||
5665 | case ALU_WRITE_PC: | |
36073a92 | 5666 | alu_write_pc (regs, dsc, val); |
cca44b1b JB |
5667 | break; |
5668 | ||
5669 | case CANNOT_WRITE_PC: | |
5670 | warning (_("Instruction wrote to PC in an unexpected way when " | |
5671 | "single-stepping")); | |
08216dd7 RE |
5672 | break; |
5673 | ||
5674 | default: | |
97b9747c JB |
5675 | internal_error (__FILE__, __LINE__, |
5676 | _("Invalid argument to displaced_write_reg")); | |
08216dd7 | 5677 | } |
b508a996 | 5678 | |
cca44b1b | 5679 | dsc->wrote_to_pc = 1; |
b508a996 | 5680 | } |
ed9a39eb | 5681 | else |
b508a996 | 5682 | { |
cca44b1b JB |
5683 | if (debug_displaced) |
5684 | fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n", | |
5685 | regno, (unsigned long) val); | |
5686 | regcache_cooked_write_unsigned (regs, regno, val); | |
b508a996 | 5687 | } |
34e8f22d RE |
5688 | } |
5689 | ||
cca44b1b JB |
5690 | /* This function is used to concisely determine if an instruction INSN |
5691 | references PC. Register fields of interest in INSN should have the | |
0963b4bd MS |
5692 | corresponding fields of BITMASK set to 0b1111. The function |
5693 | returns return 1 if any of these fields in INSN reference the PC | |
5694 | (also 0b1111, r15), else it returns 0. */ | |
67255d04 RE |
5695 | |
5696 | static int | |
cca44b1b | 5697 | insn_references_pc (uint32_t insn, uint32_t bitmask) |
67255d04 | 5698 | { |
cca44b1b | 5699 | uint32_t lowbit = 1; |
67255d04 | 5700 | |
cca44b1b JB |
5701 | while (bitmask != 0) |
5702 | { | |
5703 | uint32_t mask; | |
44e1a9eb | 5704 | |
cca44b1b JB |
5705 | for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1) |
5706 | ; | |
67255d04 | 5707 | |
cca44b1b JB |
5708 | if (!lowbit) |
5709 | break; | |
67255d04 | 5710 | |
cca44b1b | 5711 | mask = lowbit * 0xf; |
67255d04 | 5712 | |
cca44b1b JB |
5713 | if ((insn & mask) == mask) |
5714 | return 1; | |
5715 | ||
5716 | bitmask &= ~mask; | |
67255d04 RE |
5717 | } |
5718 | ||
cca44b1b JB |
5719 | return 0; |
5720 | } | |
2af48f68 | 5721 | |
cca44b1b JB |
5722 | /* The simplest copy function. Many instructions have the same effect no |
5723 | matter what address they are executed at: in those cases, use this. */ | |
67255d04 | 5724 | |
cca44b1b | 5725 | static int |
7ff120b4 YQ |
5726 | arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, |
5727 | const char *iname, struct displaced_step_closure *dsc) | |
cca44b1b JB |
5728 | { |
5729 | if (debug_displaced) | |
5730 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, " | |
5731 | "opcode/class '%s' unmodified\n", (unsigned long) insn, | |
5732 | iname); | |
67255d04 | 5733 | |
cca44b1b | 5734 | dsc->modinsn[0] = insn; |
67255d04 | 5735 | |
cca44b1b JB |
5736 | return 0; |
5737 | } | |
5738 | ||
34518530 YQ |
5739 | static int |
5740 | thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
5741 | uint16_t insn2, const char *iname, | |
5742 | struct displaced_step_closure *dsc) | |
5743 | { | |
5744 | if (debug_displaced) | |
5745 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x %.4x, " | |
5746 | "opcode/class '%s' unmodified\n", insn1, insn2, | |
5747 | iname); | |
5748 | ||
5749 | dsc->modinsn[0] = insn1; | |
5750 | dsc->modinsn[1] = insn2; | |
5751 | dsc->numinsns = 2; | |
5752 | ||
5753 | return 0; | |
5754 | } | |
5755 | ||
5756 | /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any | |
5757 | modification. */ | |
5758 | static int | |
5759 | thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, unsigned int insn, | |
5760 | const char *iname, | |
5761 | struct displaced_step_closure *dsc) | |
5762 | { | |
5763 | if (debug_displaced) | |
5764 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x, " | |
5765 | "opcode/class '%s' unmodified\n", insn, | |
5766 | iname); | |
5767 | ||
5768 | dsc->modinsn[0] = insn; | |
5769 | ||
5770 | return 0; | |
5771 | } | |
5772 | ||
cca44b1b JB |
5773 | /* Preload instructions with immediate offset. */ |
5774 | ||
5775 | static void | |
6e39997a | 5776 | cleanup_preload (struct gdbarch *gdbarch, |
cca44b1b JB |
5777 | struct regcache *regs, struct displaced_step_closure *dsc) |
5778 | { | |
5779 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5780 | if (!dsc->u.preload.immed) | |
5781 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5782 | } | |
5783 | ||
7ff120b4 YQ |
5784 | static void |
5785 | install_preload (struct gdbarch *gdbarch, struct regcache *regs, | |
5786 | struct displaced_step_closure *dsc, unsigned int rn) | |
cca44b1b | 5787 | { |
cca44b1b | 5788 | ULONGEST rn_val; |
cca44b1b JB |
5789 | /* Preload instructions: |
5790 | ||
5791 | {pli/pld} [rn, #+/-imm] | |
5792 | -> | |
5793 | {pli/pld} [r0, #+/-imm]. */ | |
5794 | ||
36073a92 YQ |
5795 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5796 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5797 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
cca44b1b JB |
5798 | dsc->u.preload.immed = 1; |
5799 | ||
cca44b1b | 5800 | dsc->cleanup = &cleanup_preload; |
cca44b1b JB |
5801 | } |
5802 | ||
cca44b1b | 5803 | static int |
7ff120b4 | 5804 | arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
cca44b1b JB |
5805 | struct displaced_step_closure *dsc) |
5806 | { | |
5807 | unsigned int rn = bits (insn, 16, 19); | |
cca44b1b | 5808 | |
7ff120b4 YQ |
5809 | if (!insn_references_pc (insn, 0x000f0000ul)) |
5810 | return arm_copy_unmodified (gdbarch, insn, "preload", dsc); | |
cca44b1b JB |
5811 | |
5812 | if (debug_displaced) | |
5813 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5814 | (unsigned long) insn); | |
5815 | ||
7ff120b4 YQ |
5816 | dsc->modinsn[0] = insn & 0xfff0ffff; |
5817 | ||
5818 | install_preload (gdbarch, regs, dsc, rn); | |
5819 | ||
5820 | return 0; | |
5821 | } | |
5822 | ||
34518530 YQ |
5823 | static int |
5824 | thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
5825 | struct regcache *regs, struct displaced_step_closure *dsc) | |
5826 | { | |
5827 | unsigned int rn = bits (insn1, 0, 3); | |
5828 | unsigned int u_bit = bit (insn1, 7); | |
5829 | int imm12 = bits (insn2, 0, 11); | |
5830 | ULONGEST pc_val; | |
5831 | ||
5832 | if (rn != ARM_PC_REGNUM) | |
5833 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "preload", dsc); | |
5834 | ||
5835 | /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and | |
5836 | PLD (literal) Encoding T1. */ | |
5837 | if (debug_displaced) | |
5838 | fprintf_unfiltered (gdb_stdlog, | |
5839 | "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n", | |
5840 | (unsigned int) dsc->insn_addr, u_bit ? '+' : '-', | |
5841 | imm12); | |
5842 | ||
5843 | if (!u_bit) | |
5844 | imm12 = -1 * imm12; | |
5845 | ||
5846 | /* Rewrite instruction {pli/pld} PC imm12 into: | |
5847 | Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12 | |
5848 | ||
5849 | {pli/pld} [r0, r1] | |
5850 | ||
5851 | Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */ | |
5852 | ||
5853 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
5854 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5855 | ||
5856 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
5857 | ||
5858 | displaced_write_reg (regs, dsc, 0, pc_val, CANNOT_WRITE_PC); | |
5859 | displaced_write_reg (regs, dsc, 1, imm12, CANNOT_WRITE_PC); | |
5860 | dsc->u.preload.immed = 0; | |
5861 | ||
5862 | /* {pli/pld} [r0, r1] */ | |
5863 | dsc->modinsn[0] = insn1 & 0xfff0; | |
5864 | dsc->modinsn[1] = 0xf001; | |
5865 | dsc->numinsns = 2; | |
5866 | ||
5867 | dsc->cleanup = &cleanup_preload; | |
5868 | return 0; | |
5869 | } | |
5870 | ||
7ff120b4 YQ |
5871 | /* Preload instructions with register offset. */ |
5872 | ||
5873 | static void | |
5874 | install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs, | |
5875 | struct displaced_step_closure *dsc, unsigned int rn, | |
5876 | unsigned int rm) | |
5877 | { | |
5878 | ULONGEST rn_val, rm_val; | |
5879 | ||
cca44b1b JB |
5880 | /* Preload register-offset instructions: |
5881 | ||
5882 | {pli/pld} [rn, rm {, shift}] | |
5883 | -> | |
5884 | {pli/pld} [r0, r1 {, shift}]. */ | |
5885 | ||
36073a92 YQ |
5886 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5887 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5888 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5889 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
5890 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5891 | displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC); | |
cca44b1b JB |
5892 | dsc->u.preload.immed = 0; |
5893 | ||
cca44b1b | 5894 | dsc->cleanup = &cleanup_preload; |
7ff120b4 YQ |
5895 | } |
5896 | ||
5897 | static int | |
5898 | arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, | |
5899 | struct regcache *regs, | |
5900 | struct displaced_step_closure *dsc) | |
5901 | { | |
5902 | unsigned int rn = bits (insn, 16, 19); | |
5903 | unsigned int rm = bits (insn, 0, 3); | |
5904 | ||
5905 | ||
5906 | if (!insn_references_pc (insn, 0x000f000ful)) | |
5907 | return arm_copy_unmodified (gdbarch, insn, "preload reg", dsc); | |
5908 | ||
5909 | if (debug_displaced) | |
5910 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5911 | (unsigned long) insn); | |
5912 | ||
5913 | dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1; | |
cca44b1b | 5914 | |
7ff120b4 | 5915 | install_preload_reg (gdbarch, regs, dsc, rn, rm); |
cca44b1b JB |
5916 | return 0; |
5917 | } | |
5918 | ||
5919 | /* Copy/cleanup coprocessor load and store instructions. */ | |
5920 | ||
5921 | static void | |
6e39997a | 5922 | cleanup_copro_load_store (struct gdbarch *gdbarch, |
cca44b1b JB |
5923 | struct regcache *regs, |
5924 | struct displaced_step_closure *dsc) | |
5925 | { | |
36073a92 | 5926 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5927 | |
5928 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5929 | ||
5930 | if (dsc->u.ldst.writeback) | |
5931 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC); | |
5932 | } | |
5933 | ||
7ff120b4 YQ |
5934 | static void |
5935 | install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs, | |
5936 | struct displaced_step_closure *dsc, | |
5937 | int writeback, unsigned int rn) | |
cca44b1b | 5938 | { |
cca44b1b | 5939 | ULONGEST rn_val; |
cca44b1b | 5940 | |
cca44b1b JB |
5941 | /* Coprocessor load/store instructions: |
5942 | ||
5943 | {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes) | |
5944 | -> | |
5945 | {stc/stc2} [r0, #+/-imm]. | |
5946 | ||
5947 | ldc/ldc2 are handled identically. */ | |
5948 | ||
36073a92 YQ |
5949 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5950 | rn_val = displaced_read_reg (regs, dsc, rn); | |
2b16b2e3 YQ |
5951 | /* PC should be 4-byte aligned. */ |
5952 | rn_val = rn_val & 0xfffffffc; | |
cca44b1b JB |
5953 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5954 | ||
7ff120b4 | 5955 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
5956 | dsc->u.ldst.rn = rn; |
5957 | ||
7ff120b4 YQ |
5958 | dsc->cleanup = &cleanup_copro_load_store; |
5959 | } | |
5960 | ||
5961 | static int | |
5962 | arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn, | |
5963 | struct regcache *regs, | |
5964 | struct displaced_step_closure *dsc) | |
5965 | { | |
5966 | unsigned int rn = bits (insn, 16, 19); | |
5967 | ||
5968 | if (!insn_references_pc (insn, 0x000f0000ul)) | |
5969 | return arm_copy_unmodified (gdbarch, insn, "copro load/store", dsc); | |
5970 | ||
5971 | if (debug_displaced) | |
5972 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5973 | "load/store insn %.8lx\n", (unsigned long) insn); | |
5974 | ||
cca44b1b JB |
5975 | dsc->modinsn[0] = insn & 0xfff0ffff; |
5976 | ||
7ff120b4 | 5977 | install_copro_load_store (gdbarch, regs, dsc, bit (insn, 25), rn); |
cca44b1b JB |
5978 | |
5979 | return 0; | |
5980 | } | |
5981 | ||
34518530 YQ |
5982 | static int |
5983 | thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1, | |
5984 | uint16_t insn2, struct regcache *regs, | |
5985 | struct displaced_step_closure *dsc) | |
5986 | { | |
5987 | unsigned int rn = bits (insn1, 0, 3); | |
5988 | ||
5989 | if (rn != ARM_PC_REGNUM) | |
5990 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
5991 | "copro load/store", dsc); | |
5992 | ||
5993 | if (debug_displaced) | |
5994 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5995 | "load/store insn %.4x%.4x\n", insn1, insn2); | |
5996 | ||
5997 | dsc->modinsn[0] = insn1 & 0xfff0; | |
5998 | dsc->modinsn[1] = insn2; | |
5999 | dsc->numinsns = 2; | |
6000 | ||
6001 | /* This function is called for copying instruction LDC/LDC2/VLDR, which | |
6002 | doesn't support writeback, so pass 0. */ | |
6003 | install_copro_load_store (gdbarch, regs, dsc, 0, rn); | |
6004 | ||
6005 | return 0; | |
6006 | } | |
6007 | ||
cca44b1b JB |
6008 | /* Clean up branch instructions (actually perform the branch, by setting |
6009 | PC). */ | |
6010 | ||
6011 | static void | |
6e39997a | 6012 | cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6013 | struct displaced_step_closure *dsc) |
6014 | { | |
36073a92 | 6015 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6016 | int branch_taken = condition_true (dsc->u.branch.cond, status); |
6017 | enum pc_write_style write_pc = dsc->u.branch.exchange | |
6018 | ? BX_WRITE_PC : BRANCH_WRITE_PC; | |
6019 | ||
6020 | if (!branch_taken) | |
6021 | return; | |
6022 | ||
6023 | if (dsc->u.branch.link) | |
6024 | { | |
8c8dba6d YQ |
6025 | /* The value of LR should be the next insn of current one. In order |
6026 | not to confuse logic hanlding later insn `bx lr', if current insn mode | |
6027 | is Thumb, the bit 0 of LR value should be set to 1. */ | |
6028 | ULONGEST next_insn_addr = dsc->insn_addr + dsc->insn_size; | |
6029 | ||
6030 | if (dsc->is_thumb) | |
6031 | next_insn_addr |= 0x1; | |
6032 | ||
6033 | displaced_write_reg (regs, dsc, ARM_LR_REGNUM, next_insn_addr, | |
6034 | CANNOT_WRITE_PC); | |
cca44b1b JB |
6035 | } |
6036 | ||
bf9f652a | 6037 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc); |
cca44b1b JB |
6038 | } |
6039 | ||
6040 | /* Copy B/BL/BLX instructions with immediate destinations. */ | |
6041 | ||
7ff120b4 YQ |
6042 | static void |
6043 | install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs, | |
6044 | struct displaced_step_closure *dsc, | |
6045 | unsigned int cond, int exchange, int link, long offset) | |
6046 | { | |
6047 | /* Implement "BL<cond> <label>" as: | |
6048 | ||
6049 | Preparation: cond <- instruction condition | |
6050 | Insn: mov r0, r0 (nop) | |
6051 | Cleanup: if (condition true) { r14 <- pc; pc <- label }. | |
6052 | ||
6053 | B<cond> similar, but don't set r14 in cleanup. */ | |
6054 | ||
6055 | dsc->u.branch.cond = cond; | |
6056 | dsc->u.branch.link = link; | |
6057 | dsc->u.branch.exchange = exchange; | |
6058 | ||
2b16b2e3 YQ |
6059 | dsc->u.branch.dest = dsc->insn_addr; |
6060 | if (link && exchange) | |
6061 | /* For BLX, offset is computed from the Align (PC, 4). */ | |
6062 | dsc->u.branch.dest = dsc->u.branch.dest & 0xfffffffc; | |
6063 | ||
7ff120b4 | 6064 | if (dsc->is_thumb) |
2b16b2e3 | 6065 | dsc->u.branch.dest += 4 + offset; |
7ff120b4 | 6066 | else |
2b16b2e3 | 6067 | dsc->u.branch.dest += 8 + offset; |
7ff120b4 YQ |
6068 | |
6069 | dsc->cleanup = &cleanup_branch; | |
6070 | } | |
cca44b1b | 6071 | static int |
7ff120b4 YQ |
6072 | arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn, |
6073 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
6074 | { |
6075 | unsigned int cond = bits (insn, 28, 31); | |
6076 | int exchange = (cond == 0xf); | |
6077 | int link = exchange || bit (insn, 24); | |
cca44b1b JB |
6078 | long offset; |
6079 | ||
6080 | if (debug_displaced) | |
6081 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn " | |
6082 | "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b", | |
6083 | (unsigned long) insn); | |
cca44b1b JB |
6084 | if (exchange) |
6085 | /* For BLX, set bit 0 of the destination. The cleanup_branch function will | |
6086 | then arrange the switch into Thumb mode. */ | |
6087 | offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1; | |
6088 | else | |
6089 | offset = bits (insn, 0, 23) << 2; | |
6090 | ||
6091 | if (bit (offset, 25)) | |
6092 | offset = offset | ~0x3ffffff; | |
6093 | ||
cca44b1b JB |
6094 | dsc->modinsn[0] = ARM_NOP; |
6095 | ||
7ff120b4 | 6096 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); |
cca44b1b JB |
6097 | return 0; |
6098 | } | |
6099 | ||
34518530 YQ |
6100 | static int |
6101 | thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1, | |
6102 | uint16_t insn2, struct regcache *regs, | |
6103 | struct displaced_step_closure *dsc) | |
6104 | { | |
6105 | int link = bit (insn2, 14); | |
6106 | int exchange = link && !bit (insn2, 12); | |
6107 | int cond = INST_AL; | |
6108 | long offset = 0; | |
6109 | int j1 = bit (insn2, 13); | |
6110 | int j2 = bit (insn2, 11); | |
6111 | int s = sbits (insn1, 10, 10); | |
6112 | int i1 = !(j1 ^ bit (insn1, 10)); | |
6113 | int i2 = !(j2 ^ bit (insn1, 10)); | |
6114 | ||
6115 | if (!link && !exchange) /* B */ | |
6116 | { | |
6117 | offset = (bits (insn2, 0, 10) << 1); | |
6118 | if (bit (insn2, 12)) /* Encoding T4 */ | |
6119 | { | |
6120 | offset |= (bits (insn1, 0, 9) << 12) | |
6121 | | (i2 << 22) | |
6122 | | (i1 << 23) | |
6123 | | (s << 24); | |
6124 | cond = INST_AL; | |
6125 | } | |
6126 | else /* Encoding T3 */ | |
6127 | { | |
6128 | offset |= (bits (insn1, 0, 5) << 12) | |
6129 | | (j1 << 18) | |
6130 | | (j2 << 19) | |
6131 | | (s << 20); | |
6132 | cond = bits (insn1, 6, 9); | |
6133 | } | |
6134 | } | |
6135 | else | |
6136 | { | |
6137 | offset = (bits (insn1, 0, 9) << 12); | |
6138 | offset |= ((i2 << 22) | (i1 << 23) | (s << 24)); | |
6139 | offset |= exchange ? | |
6140 | (bits (insn2, 1, 10) << 2) : (bits (insn2, 0, 10) << 1); | |
6141 | } | |
6142 | ||
6143 | if (debug_displaced) | |
6144 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s insn " | |
6145 | "%.4x %.4x with offset %.8lx\n", | |
6146 | link ? (exchange) ? "blx" : "bl" : "b", | |
6147 | insn1, insn2, offset); | |
6148 | ||
6149 | dsc->modinsn[0] = THUMB_NOP; | |
6150 | ||
6151 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); | |
6152 | return 0; | |
6153 | } | |
6154 | ||
6155 | /* Copy B Thumb instructions. */ | |
6156 | static int | |
6157 | thumb_copy_b (struct gdbarch *gdbarch, unsigned short insn, | |
6158 | struct displaced_step_closure *dsc) | |
6159 | { | |
6160 | unsigned int cond = 0; | |
6161 | int offset = 0; | |
6162 | unsigned short bit_12_15 = bits (insn, 12, 15); | |
6163 | CORE_ADDR from = dsc->insn_addr; | |
6164 | ||
6165 | if (bit_12_15 == 0xd) | |
6166 | { | |
6167 | /* offset = SignExtend (imm8:0, 32) */ | |
6168 | offset = sbits ((insn << 1), 0, 8); | |
6169 | cond = bits (insn, 8, 11); | |
6170 | } | |
6171 | else if (bit_12_15 == 0xe) /* Encoding T2 */ | |
6172 | { | |
6173 | offset = sbits ((insn << 1), 0, 11); | |
6174 | cond = INST_AL; | |
6175 | } | |
6176 | ||
6177 | if (debug_displaced) | |
6178 | fprintf_unfiltered (gdb_stdlog, | |
6179 | "displaced: copying b immediate insn %.4x " | |
6180 | "with offset %d\n", insn, offset); | |
6181 | ||
6182 | dsc->u.branch.cond = cond; | |
6183 | dsc->u.branch.link = 0; | |
6184 | dsc->u.branch.exchange = 0; | |
6185 | dsc->u.branch.dest = from + 4 + offset; | |
6186 | ||
6187 | dsc->modinsn[0] = THUMB_NOP; | |
6188 | ||
6189 | dsc->cleanup = &cleanup_branch; | |
6190 | ||
6191 | return 0; | |
6192 | } | |
6193 | ||
cca44b1b JB |
6194 | /* Copy BX/BLX with register-specified destinations. */ |
6195 | ||
7ff120b4 YQ |
6196 | static void |
6197 | install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6198 | struct displaced_step_closure *dsc, int link, | |
6199 | unsigned int cond, unsigned int rm) | |
cca44b1b | 6200 | { |
cca44b1b JB |
6201 | /* Implement {BX,BLX}<cond> <reg>" as: |
6202 | ||
6203 | Preparation: cond <- instruction condition | |
6204 | Insn: mov r0, r0 (nop) | |
6205 | Cleanup: if (condition true) { r14 <- pc; pc <- dest; }. | |
6206 | ||
6207 | Don't set r14 in cleanup for BX. */ | |
6208 | ||
36073a92 | 6209 | dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6210 | |
6211 | dsc->u.branch.cond = cond; | |
6212 | dsc->u.branch.link = link; | |
cca44b1b | 6213 | |
7ff120b4 | 6214 | dsc->u.branch.exchange = 1; |
cca44b1b JB |
6215 | |
6216 | dsc->cleanup = &cleanup_branch; | |
7ff120b4 | 6217 | } |
cca44b1b | 6218 | |
7ff120b4 YQ |
6219 | static int |
6220 | arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn, | |
6221 | struct regcache *regs, struct displaced_step_closure *dsc) | |
6222 | { | |
6223 | unsigned int cond = bits (insn, 28, 31); | |
6224 | /* BX: x12xxx1x | |
6225 | BLX: x12xxx3x. */ | |
6226 | int link = bit (insn, 5); | |
6227 | unsigned int rm = bits (insn, 0, 3); | |
6228 | ||
6229 | if (debug_displaced) | |
6230 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx", | |
6231 | (unsigned long) insn); | |
6232 | ||
6233 | dsc->modinsn[0] = ARM_NOP; | |
6234 | ||
6235 | install_bx_blx_reg (gdbarch, regs, dsc, link, cond, rm); | |
cca44b1b JB |
6236 | return 0; |
6237 | } | |
6238 | ||
34518530 YQ |
6239 | static int |
6240 | thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn, | |
6241 | struct regcache *regs, | |
6242 | struct displaced_step_closure *dsc) | |
6243 | { | |
6244 | int link = bit (insn, 7); | |
6245 | unsigned int rm = bits (insn, 3, 6); | |
6246 | ||
6247 | if (debug_displaced) | |
6248 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x", | |
6249 | (unsigned short) insn); | |
6250 | ||
6251 | dsc->modinsn[0] = THUMB_NOP; | |
6252 | ||
6253 | install_bx_blx_reg (gdbarch, regs, dsc, link, INST_AL, rm); | |
6254 | ||
6255 | return 0; | |
6256 | } | |
6257 | ||
6258 | ||
0963b4bd | 6259 | /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */ |
cca44b1b JB |
6260 | |
6261 | static void | |
6e39997a | 6262 | cleanup_alu_imm (struct gdbarch *gdbarch, |
cca44b1b JB |
6263 | struct regcache *regs, struct displaced_step_closure *dsc) |
6264 | { | |
36073a92 | 6265 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6266 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
6267 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6268 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6269 | } | |
6270 | ||
6271 | static int | |
7ff120b4 YQ |
6272 | arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
6273 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
6274 | { |
6275 | unsigned int rn = bits (insn, 16, 19); | |
6276 | unsigned int rd = bits (insn, 12, 15); | |
6277 | unsigned int op = bits (insn, 21, 24); | |
6278 | int is_mov = (op == 0xd); | |
6279 | ULONGEST rd_val, rn_val; | |
cca44b1b JB |
6280 | |
6281 | if (!insn_references_pc (insn, 0x000ff000ul)) | |
7ff120b4 | 6282 | return arm_copy_unmodified (gdbarch, insn, "ALU immediate", dsc); |
cca44b1b JB |
6283 | |
6284 | if (debug_displaced) | |
6285 | fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn " | |
6286 | "%.8lx\n", is_mov ? "move" : "ALU", | |
6287 | (unsigned long) insn); | |
6288 | ||
6289 | /* Instruction is of form: | |
6290 | ||
6291 | <op><cond> rd, [rn,] #imm | |
6292 | ||
6293 | Rewrite as: | |
6294 | ||
6295 | Preparation: tmp1, tmp2 <- r0, r1; | |
6296 | r0, r1 <- rd, rn | |
6297 | Insn: <op><cond> r0, r1, #imm | |
6298 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
6299 | */ | |
6300 | ||
36073a92 YQ |
6301 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6302 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6303 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6304 | rd_val = displaced_read_reg (regs, dsc, rd); | |
cca44b1b JB |
6305 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6306 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6307 | dsc->rd = rd; | |
6308 | ||
6309 | if (is_mov) | |
6310 | dsc->modinsn[0] = insn & 0xfff00fff; | |
6311 | else | |
6312 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000; | |
6313 | ||
6314 | dsc->cleanup = &cleanup_alu_imm; | |
6315 | ||
6316 | return 0; | |
6317 | } | |
6318 | ||
34518530 YQ |
6319 | static int |
6320 | thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
6321 | uint16_t insn2, struct regcache *regs, | |
6322 | struct displaced_step_closure *dsc) | |
6323 | { | |
6324 | unsigned int op = bits (insn1, 5, 8); | |
6325 | unsigned int rn, rm, rd; | |
6326 | ULONGEST rd_val, rn_val; | |
6327 | ||
6328 | rn = bits (insn1, 0, 3); /* Rn */ | |
6329 | rm = bits (insn2, 0, 3); /* Rm */ | |
6330 | rd = bits (insn2, 8, 11); /* Rd */ | |
6331 | ||
6332 | /* This routine is only called for instruction MOV. */ | |
6333 | gdb_assert (op == 0x2 && rn == 0xf); | |
6334 | ||
6335 | if (rm != ARM_PC_REGNUM && rd != ARM_PC_REGNUM) | |
6336 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ALU imm", dsc); | |
6337 | ||
6338 | if (debug_displaced) | |
6339 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x%.4x\n", | |
6340 | "ALU", insn1, insn2); | |
6341 | ||
6342 | /* Instruction is of form: | |
6343 | ||
6344 | <op><cond> rd, [rn,] #imm | |
6345 | ||
6346 | Rewrite as: | |
6347 | ||
6348 | Preparation: tmp1, tmp2 <- r0, r1; | |
6349 | r0, r1 <- rd, rn | |
6350 | Insn: <op><cond> r0, r1, #imm | |
6351 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
6352 | */ | |
6353 | ||
6354 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
6355 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6356 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6357 | rd_val = displaced_read_reg (regs, dsc, rd); | |
6358 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); | |
6359 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6360 | dsc->rd = rd; | |
6361 | ||
6362 | dsc->modinsn[0] = insn1; | |
6363 | dsc->modinsn[1] = ((insn2 & 0xf0f0) | 0x1); | |
6364 | dsc->numinsns = 2; | |
6365 | ||
6366 | dsc->cleanup = &cleanup_alu_imm; | |
6367 | ||
6368 | return 0; | |
6369 | } | |
6370 | ||
cca44b1b JB |
6371 | /* Copy/cleanup arithmetic/logic insns with register RHS. */ |
6372 | ||
6373 | static void | |
6e39997a | 6374 | cleanup_alu_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
6375 | struct regcache *regs, struct displaced_step_closure *dsc) |
6376 | { | |
6377 | ULONGEST rd_val; | |
6378 | int i; | |
6379 | ||
36073a92 | 6380 | rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6381 | |
6382 | for (i = 0; i < 3; i++) | |
6383 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
6384 | ||
6385 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6386 | } | |
6387 | ||
7ff120b4 YQ |
6388 | static void |
6389 | install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6390 | struct displaced_step_closure *dsc, | |
6391 | unsigned int rd, unsigned int rn, unsigned int rm) | |
cca44b1b | 6392 | { |
cca44b1b | 6393 | ULONGEST rd_val, rn_val, rm_val; |
cca44b1b | 6394 | |
cca44b1b JB |
6395 | /* Instruction is of form: |
6396 | ||
6397 | <op><cond> rd, [rn,] rm [, <shift>] | |
6398 | ||
6399 | Rewrite as: | |
6400 | ||
6401 | Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2; | |
6402 | r0, r1, r2 <- rd, rn, rm | |
6403 | Insn: <op><cond> r0, r1, r2 [, <shift>] | |
6404 | Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3 | |
6405 | */ | |
6406 | ||
36073a92 YQ |
6407 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6408 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6409 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
6410 | rd_val = displaced_read_reg (regs, dsc, rd); | |
6411 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6412 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
6413 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6414 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6415 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
6416 | dsc->rd = rd; | |
6417 | ||
7ff120b4 YQ |
6418 | dsc->cleanup = &cleanup_alu_reg; |
6419 | } | |
6420 | ||
6421 | static int | |
6422 | arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
6423 | struct displaced_step_closure *dsc) | |
6424 | { | |
6425 | unsigned int op = bits (insn, 21, 24); | |
6426 | int is_mov = (op == 0xd); | |
6427 | ||
6428 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
6429 | return arm_copy_unmodified (gdbarch, insn, "ALU reg", dsc); | |
6430 | ||
6431 | if (debug_displaced) | |
6432 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n", | |
6433 | is_mov ? "move" : "ALU", (unsigned long) insn); | |
6434 | ||
cca44b1b JB |
6435 | if (is_mov) |
6436 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2; | |
6437 | else | |
6438 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002; | |
6439 | ||
7ff120b4 YQ |
6440 | install_alu_reg (gdbarch, regs, dsc, bits (insn, 12, 15), bits (insn, 16, 19), |
6441 | bits (insn, 0, 3)); | |
cca44b1b JB |
6442 | return 0; |
6443 | } | |
6444 | ||
34518530 YQ |
6445 | static int |
6446 | thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn, | |
6447 | struct regcache *regs, | |
6448 | struct displaced_step_closure *dsc) | |
6449 | { | |
6450 | unsigned rn, rm, rd; | |
6451 | ||
6452 | rd = bits (insn, 3, 6); | |
6453 | rn = (bit (insn, 7) << 3) | bits (insn, 0, 2); | |
6454 | rm = 2; | |
6455 | ||
6456 | if (rd != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
6457 | return thumb_copy_unmodified_16bit (gdbarch, insn, "ALU reg", dsc); | |
6458 | ||
6459 | if (debug_displaced) | |
6460 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x\n", | |
6461 | "ALU", (unsigned short) insn); | |
6462 | ||
6463 | dsc->modinsn[0] = ((insn & 0xff00) | 0x08); | |
6464 | ||
6465 | install_alu_reg (gdbarch, regs, dsc, rd, rn, rm); | |
6466 | ||
6467 | return 0; | |
6468 | } | |
6469 | ||
cca44b1b JB |
6470 | /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */ |
6471 | ||
6472 | static void | |
6e39997a | 6473 | cleanup_alu_shifted_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
6474 | struct regcache *regs, |
6475 | struct displaced_step_closure *dsc) | |
6476 | { | |
36073a92 | 6477 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6478 | int i; |
6479 | ||
6480 | for (i = 0; i < 4; i++) | |
6481 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
6482 | ||
6483 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6484 | } | |
6485 | ||
7ff120b4 YQ |
6486 | static void |
6487 | install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6488 | struct displaced_step_closure *dsc, | |
6489 | unsigned int rd, unsigned int rn, unsigned int rm, | |
6490 | unsigned rs) | |
cca44b1b | 6491 | { |
7ff120b4 | 6492 | int i; |
cca44b1b | 6493 | ULONGEST rd_val, rn_val, rm_val, rs_val; |
cca44b1b | 6494 | |
cca44b1b JB |
6495 | /* Instruction is of form: |
6496 | ||
6497 | <op><cond> rd, [rn,] rm, <shift> rs | |
6498 | ||
6499 | Rewrite as: | |
6500 | ||
6501 | Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3 | |
6502 | r0, r1, r2, r3 <- rd, rn, rm, rs | |
6503 | Insn: <op><cond> r0, r1, r2, <shift> r3 | |
6504 | Cleanup: tmp5 <- r0 | |
6505 | r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4 | |
6506 | rd <- tmp5 | |
6507 | */ | |
6508 | ||
6509 | for (i = 0; i < 4; i++) | |
36073a92 | 6510 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b | 6511 | |
36073a92 YQ |
6512 | rd_val = displaced_read_reg (regs, dsc, rd); |
6513 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6514 | rm_val = displaced_read_reg (regs, dsc, rm); | |
6515 | rs_val = displaced_read_reg (regs, dsc, rs); | |
cca44b1b JB |
6516 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6517 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6518 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
6519 | displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC); | |
6520 | dsc->rd = rd; | |
7ff120b4 YQ |
6521 | dsc->cleanup = &cleanup_alu_shifted_reg; |
6522 | } | |
6523 | ||
6524 | static int | |
6525 | arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn, | |
6526 | struct regcache *regs, | |
6527 | struct displaced_step_closure *dsc) | |
6528 | { | |
6529 | unsigned int op = bits (insn, 21, 24); | |
6530 | int is_mov = (op == 0xd); | |
6531 | unsigned int rd, rn, rm, rs; | |
6532 | ||
6533 | if (!insn_references_pc (insn, 0x000fff0ful)) | |
6534 | return arm_copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc); | |
6535 | ||
6536 | if (debug_displaced) | |
6537 | fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn " | |
6538 | "%.8lx\n", is_mov ? "move" : "ALU", | |
6539 | (unsigned long) insn); | |
6540 | ||
6541 | rn = bits (insn, 16, 19); | |
6542 | rm = bits (insn, 0, 3); | |
6543 | rs = bits (insn, 8, 11); | |
6544 | rd = bits (insn, 12, 15); | |
cca44b1b JB |
6545 | |
6546 | if (is_mov) | |
6547 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302; | |
6548 | else | |
6549 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302; | |
6550 | ||
7ff120b4 | 6551 | install_alu_shifted_reg (gdbarch, regs, dsc, rd, rn, rm, rs); |
cca44b1b JB |
6552 | |
6553 | return 0; | |
6554 | } | |
6555 | ||
6556 | /* Clean up load instructions. */ | |
6557 | ||
6558 | static void | |
6e39997a | 6559 | cleanup_load (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6560 | struct displaced_step_closure *dsc) |
6561 | { | |
6562 | ULONGEST rt_val, rt_val2 = 0, rn_val; | |
cca44b1b | 6563 | |
36073a92 | 6564 | rt_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b | 6565 | if (dsc->u.ldst.xfersize == 8) |
36073a92 YQ |
6566 | rt_val2 = displaced_read_reg (regs, dsc, 1); |
6567 | rn_val = displaced_read_reg (regs, dsc, 2); | |
cca44b1b JB |
6568 | |
6569 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
6570 | if (dsc->u.ldst.xfersize > 4) | |
6571 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6572 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
6573 | if (!dsc->u.ldst.immed) | |
6574 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
6575 | ||
6576 | /* Handle register writeback. */ | |
6577 | if (dsc->u.ldst.writeback) | |
6578 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
6579 | /* Put result in right place. */ | |
6580 | displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC); | |
6581 | if (dsc->u.ldst.xfersize == 8) | |
6582 | displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC); | |
6583 | } | |
6584 | ||
6585 | /* Clean up store instructions. */ | |
6586 | ||
6587 | static void | |
6e39997a | 6588 | cleanup_store (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6589 | struct displaced_step_closure *dsc) |
6590 | { | |
36073a92 | 6591 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 2); |
cca44b1b JB |
6592 | |
6593 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
6594 | if (dsc->u.ldst.xfersize > 4) | |
6595 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6596 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
6597 | if (!dsc->u.ldst.immed) | |
6598 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
6599 | if (!dsc->u.ldst.restore_r4) | |
6600 | displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC); | |
6601 | ||
6602 | /* Writeback. */ | |
6603 | if (dsc->u.ldst.writeback) | |
6604 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
6605 | } | |
6606 | ||
6607 | /* Copy "extra" load/store instructions. These are halfword/doubleword | |
6608 | transfers, which have a different encoding to byte/word transfers. */ | |
6609 | ||
6610 | static int | |
7ff120b4 YQ |
6611 | arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged, |
6612 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
6613 | { |
6614 | unsigned int op1 = bits (insn, 20, 24); | |
6615 | unsigned int op2 = bits (insn, 5, 6); | |
6616 | unsigned int rt = bits (insn, 12, 15); | |
6617 | unsigned int rn = bits (insn, 16, 19); | |
6618 | unsigned int rm = bits (insn, 0, 3); | |
6619 | char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1}; | |
6620 | char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2}; | |
6621 | int immed = (op1 & 0x4) != 0; | |
6622 | int opcode; | |
6623 | ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0; | |
cca44b1b JB |
6624 | |
6625 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
7ff120b4 | 6626 | return arm_copy_unmodified (gdbarch, insn, "extra load/store", dsc); |
cca44b1b JB |
6627 | |
6628 | if (debug_displaced) | |
6629 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store " | |
6630 | "insn %.8lx\n", unpriveleged ? "unpriveleged " : "", | |
6631 | (unsigned long) insn); | |
6632 | ||
6633 | opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4; | |
6634 | ||
6635 | if (opcode < 0) | |
6636 | internal_error (__FILE__, __LINE__, | |
6637 | _("copy_extra_ld_st: instruction decode error")); | |
6638 | ||
36073a92 YQ |
6639 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6640 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6641 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 6642 | if (!immed) |
36073a92 | 6643 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 6644 | |
36073a92 | 6645 | rt_val = displaced_read_reg (regs, dsc, rt); |
cca44b1b | 6646 | if (bytesize[opcode] == 8) |
36073a92 YQ |
6647 | rt_val2 = displaced_read_reg (regs, dsc, rt + 1); |
6648 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6649 | if (!immed) |
36073a92 | 6650 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6651 | |
6652 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
6653 | if (bytesize[opcode] == 8) | |
6654 | displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC); | |
6655 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
6656 | if (!immed) | |
6657 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
6658 | ||
6659 | dsc->rd = rt; | |
6660 | dsc->u.ldst.xfersize = bytesize[opcode]; | |
6661 | dsc->u.ldst.rn = rn; | |
6662 | dsc->u.ldst.immed = immed; | |
6663 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; | |
6664 | dsc->u.ldst.restore_r4 = 0; | |
6665 | ||
6666 | if (immed) | |
6667 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm] | |
6668 | -> | |
6669 | {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */ | |
6670 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
6671 | else | |
6672 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm] | |
6673 | -> | |
6674 | {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */ | |
6675 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
6676 | ||
6677 | dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store; | |
6678 | ||
6679 | return 0; | |
6680 | } | |
6681 | ||
0f6f04ba | 6682 | /* Copy byte/half word/word loads and stores. */ |
cca44b1b | 6683 | |
7ff120b4 | 6684 | static void |
0f6f04ba YQ |
6685 | install_load_store (struct gdbarch *gdbarch, struct regcache *regs, |
6686 | struct displaced_step_closure *dsc, int load, | |
6687 | int immed, int writeback, int size, int usermode, | |
6688 | int rt, int rm, int rn) | |
cca44b1b | 6689 | { |
cca44b1b | 6690 | ULONGEST rt_val, rn_val, rm_val = 0; |
cca44b1b | 6691 | |
36073a92 YQ |
6692 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6693 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 6694 | if (!immed) |
36073a92 | 6695 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 6696 | if (!load) |
36073a92 | 6697 | dsc->tmp[4] = displaced_read_reg (regs, dsc, 4); |
cca44b1b | 6698 | |
36073a92 YQ |
6699 | rt_val = displaced_read_reg (regs, dsc, rt); |
6700 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6701 | if (!immed) |
36073a92 | 6702 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6703 | |
6704 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
6705 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
6706 | if (!immed) | |
6707 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
cca44b1b | 6708 | dsc->rd = rt; |
0f6f04ba | 6709 | dsc->u.ldst.xfersize = size; |
cca44b1b JB |
6710 | dsc->u.ldst.rn = rn; |
6711 | dsc->u.ldst.immed = immed; | |
7ff120b4 | 6712 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
6713 | |
6714 | /* To write PC we can do: | |
6715 | ||
494e194e YQ |
6716 | Before this sequence of instructions: |
6717 | r0 is the PC value got from displaced_read_reg, so r0 = from + 8; | |
6718 | r2 is the Rn value got from dispalced_read_reg. | |
6719 | ||
6720 | Insn1: push {pc} Write address of STR instruction + offset on stack | |
6721 | Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset | |
6722 | Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc | |
6723 | = addr(Insn1) + offset - addr(Insn3) - 8 | |
6724 | = offset - 16 | |
6725 | Insn4: add r4, r4, #8 r4 = offset - 8 | |
6726 | Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8 | |
6727 | = from + offset | |
6728 | Insn6: str r0, [r2, #imm] (or str r0, [r2, r3]) | |
cca44b1b JB |
6729 | |
6730 | Otherwise we don't know what value to write for PC, since the offset is | |
494e194e YQ |
6731 | architecture-dependent (sometimes PC+8, sometimes PC+12). More details |
6732 | of this can be found in Section "Saving from r15" in | |
6733 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */ | |
cca44b1b | 6734 | |
7ff120b4 YQ |
6735 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; |
6736 | } | |
6737 | ||
34518530 YQ |
6738 | |
6739 | static int | |
6740 | thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1, | |
6741 | uint16_t insn2, struct regcache *regs, | |
6742 | struct displaced_step_closure *dsc, int size) | |
6743 | { | |
6744 | unsigned int u_bit = bit (insn1, 7); | |
6745 | unsigned int rt = bits (insn2, 12, 15); | |
6746 | int imm12 = bits (insn2, 0, 11); | |
6747 | ULONGEST pc_val; | |
6748 | ||
6749 | if (debug_displaced) | |
6750 | fprintf_unfiltered (gdb_stdlog, | |
6751 | "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n", | |
6752 | (unsigned int) dsc->insn_addr, rt, u_bit ? '+' : '-', | |
6753 | imm12); | |
6754 | ||
6755 | if (!u_bit) | |
6756 | imm12 = -1 * imm12; | |
6757 | ||
6758 | /* Rewrite instruction LDR Rt imm12 into: | |
6759 | ||
6760 | Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12 | |
6761 | ||
6762 | LDR R0, R2, R3, | |
6763 | ||
6764 | Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */ | |
6765 | ||
6766 | ||
6767 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
6768 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
6769 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
6770 | ||
6771 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
6772 | ||
6773 | pc_val = pc_val & 0xfffffffc; | |
6774 | ||
6775 | displaced_write_reg (regs, dsc, 2, pc_val, CANNOT_WRITE_PC); | |
6776 | displaced_write_reg (regs, dsc, 3, imm12, CANNOT_WRITE_PC); | |
6777 | ||
6778 | dsc->rd = rt; | |
6779 | ||
6780 | dsc->u.ldst.xfersize = size; | |
6781 | dsc->u.ldst.immed = 0; | |
6782 | dsc->u.ldst.writeback = 0; | |
6783 | dsc->u.ldst.restore_r4 = 0; | |
6784 | ||
6785 | /* LDR R0, R2, R3 */ | |
6786 | dsc->modinsn[0] = 0xf852; | |
6787 | dsc->modinsn[1] = 0x3; | |
6788 | dsc->numinsns = 2; | |
6789 | ||
6790 | dsc->cleanup = &cleanup_load; | |
6791 | ||
6792 | return 0; | |
6793 | } | |
6794 | ||
6795 | static int | |
6796 | thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
6797 | uint16_t insn2, struct regcache *regs, | |
6798 | struct displaced_step_closure *dsc, | |
6799 | int writeback, int immed) | |
6800 | { | |
6801 | unsigned int rt = bits (insn2, 12, 15); | |
6802 | unsigned int rn = bits (insn1, 0, 3); | |
6803 | unsigned int rm = bits (insn2, 0, 3); /* Only valid if !immed. */ | |
6804 | /* In LDR (register), there is also a register Rm, which is not allowed to | |
6805 | be PC, so we don't have to check it. */ | |
6806 | ||
6807 | if (rt != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
6808 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "load", | |
6809 | dsc); | |
6810 | ||
6811 | if (debug_displaced) | |
6812 | fprintf_unfiltered (gdb_stdlog, | |
6813 | "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n", | |
6814 | rt, rn, insn1, insn2); | |
6815 | ||
6816 | install_load_store (gdbarch, regs, dsc, 1, immed, writeback, 4, | |
6817 | 0, rt, rm, rn); | |
6818 | ||
6819 | dsc->u.ldst.restore_r4 = 0; | |
6820 | ||
6821 | if (immed) | |
6822 | /* ldr[b]<cond> rt, [rn, #imm], etc. | |
6823 | -> | |
6824 | ldr[b]<cond> r0, [r2, #imm]. */ | |
6825 | { | |
6826 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
6827 | dsc->modinsn[1] = insn2 & 0x0fff; | |
6828 | } | |
6829 | else | |
6830 | /* ldr[b]<cond> rt, [rn, rm], etc. | |
6831 | -> | |
6832 | ldr[b]<cond> r0, [r2, r3]. */ | |
6833 | { | |
6834 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
6835 | dsc->modinsn[1] = (insn2 & 0x0ff0) | 0x3; | |
6836 | } | |
6837 | ||
6838 | dsc->numinsns = 2; | |
6839 | ||
6840 | return 0; | |
6841 | } | |
6842 | ||
6843 | ||
7ff120b4 YQ |
6844 | static int |
6845 | arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn, | |
6846 | struct regcache *regs, | |
6847 | struct displaced_step_closure *dsc, | |
0f6f04ba | 6848 | int load, int size, int usermode) |
7ff120b4 YQ |
6849 | { |
6850 | int immed = !bit (insn, 25); | |
6851 | int writeback = (bit (insn, 24) == 0 || bit (insn, 21) != 0); | |
6852 | unsigned int rt = bits (insn, 12, 15); | |
6853 | unsigned int rn = bits (insn, 16, 19); | |
6854 | unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */ | |
6855 | ||
6856 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
6857 | return arm_copy_unmodified (gdbarch, insn, "load/store", dsc); | |
6858 | ||
6859 | if (debug_displaced) | |
6860 | fprintf_unfiltered (gdb_stdlog, | |
6861 | "displaced: copying %s%s r%d [r%d] insn %.8lx\n", | |
0f6f04ba YQ |
6862 | load ? (size == 1 ? "ldrb" : "ldr") |
6863 | : (size == 1 ? "strb" : "str"), usermode ? "t" : "", | |
7ff120b4 YQ |
6864 | rt, rn, |
6865 | (unsigned long) insn); | |
6866 | ||
0f6f04ba YQ |
6867 | install_load_store (gdbarch, regs, dsc, load, immed, writeback, size, |
6868 | usermode, rt, rm, rn); | |
7ff120b4 | 6869 | |
bf9f652a | 6870 | if (load || rt != ARM_PC_REGNUM) |
cca44b1b JB |
6871 | { |
6872 | dsc->u.ldst.restore_r4 = 0; | |
6873 | ||
6874 | if (immed) | |
6875 | /* {ldr,str}[b]<cond> rt, [rn, #imm], etc. | |
6876 | -> | |
6877 | {ldr,str}[b]<cond> r0, [r2, #imm]. */ | |
6878 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
6879 | else | |
6880 | /* {ldr,str}[b]<cond> rt, [rn, rm], etc. | |
6881 | -> | |
6882 | {ldr,str}[b]<cond> r0, [r2, r3]. */ | |
6883 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
6884 | } | |
6885 | else | |
6886 | { | |
6887 | /* We need to use r4 as scratch. Make sure it's restored afterwards. */ | |
6888 | dsc->u.ldst.restore_r4 = 1; | |
494e194e YQ |
6889 | dsc->modinsn[0] = 0xe92d8000; /* push {pc} */ |
6890 | dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */ | |
cca44b1b JB |
6891 | dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */ |
6892 | dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */ | |
6893 | dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */ | |
6894 | ||
6895 | /* As above. */ | |
6896 | if (immed) | |
6897 | dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000; | |
6898 | else | |
6899 | dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003; | |
6900 | ||
cca44b1b JB |
6901 | dsc->numinsns = 6; |
6902 | } | |
6903 | ||
6904 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; | |
6905 | ||
6906 | return 0; | |
6907 | } | |
6908 | ||
6909 | /* Cleanup LDM instructions with fully-populated register list. This is an | |
6910 | unfortunate corner case: it's impossible to implement correctly by modifying | |
6911 | the instruction. The issue is as follows: we have an instruction, | |
6912 | ||
6913 | ldm rN, {r0-r15} | |
6914 | ||
6915 | which we must rewrite to avoid loading PC. A possible solution would be to | |
6916 | do the load in two halves, something like (with suitable cleanup | |
6917 | afterwards): | |
6918 | ||
6919 | mov r8, rN | |
6920 | ldm[id][ab] r8!, {r0-r7} | |
6921 | str r7, <temp> | |
6922 | ldm[id][ab] r8, {r7-r14} | |
6923 | <bkpt> | |
6924 | ||
6925 | but at present there's no suitable place for <temp>, since the scratch space | |
6926 | is overwritten before the cleanup routine is called. For now, we simply | |
6927 | emulate the instruction. */ | |
6928 | ||
6929 | static void | |
6930 | cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs, | |
6931 | struct displaced_step_closure *dsc) | |
6932 | { | |
cca44b1b JB |
6933 | int inc = dsc->u.block.increment; |
6934 | int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0; | |
6935 | int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4); | |
6936 | uint32_t regmask = dsc->u.block.regmask; | |
6937 | int regno = inc ? 0 : 15; | |
6938 | CORE_ADDR xfer_addr = dsc->u.block.xfer_addr; | |
6939 | int exception_return = dsc->u.block.load && dsc->u.block.user | |
6940 | && (regmask & 0x8000) != 0; | |
36073a92 | 6941 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6942 | int do_transfer = condition_true (dsc->u.block.cond, status); |
6943 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6944 | ||
6945 | if (!do_transfer) | |
6946 | return; | |
6947 | ||
6948 | /* If the instruction is ldm rN, {...pc}^, I don't think there's anything | |
6949 | sensible we can do here. Complain loudly. */ | |
6950 | if (exception_return) | |
6951 | error (_("Cannot single-step exception return")); | |
6952 | ||
6953 | /* We don't handle any stores here for now. */ | |
6954 | gdb_assert (dsc->u.block.load != 0); | |
6955 | ||
6956 | if (debug_displaced) | |
6957 | fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: " | |
6958 | "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm", | |
6959 | dsc->u.block.increment ? "inc" : "dec", | |
6960 | dsc->u.block.before ? "before" : "after"); | |
6961 | ||
6962 | while (regmask) | |
6963 | { | |
6964 | uint32_t memword; | |
6965 | ||
6966 | if (inc) | |
bf9f652a | 6967 | while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0) |
cca44b1b JB |
6968 | regno++; |
6969 | else | |
6970 | while (regno >= 0 && (regmask & (1 << regno)) == 0) | |
6971 | regno--; | |
6972 | ||
6973 | xfer_addr += bump_before; | |
6974 | ||
6975 | memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order); | |
6976 | displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC); | |
6977 | ||
6978 | xfer_addr += bump_after; | |
6979 | ||
6980 | regmask &= ~(1 << regno); | |
6981 | } | |
6982 | ||
6983 | if (dsc->u.block.writeback) | |
6984 | displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr, | |
6985 | CANNOT_WRITE_PC); | |
6986 | } | |
6987 | ||
6988 | /* Clean up an STM which included the PC in the register list. */ | |
6989 | ||
6990 | static void | |
6991 | cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs, | |
6992 | struct displaced_step_closure *dsc) | |
6993 | { | |
36073a92 | 6994 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6995 | int store_executed = condition_true (dsc->u.block.cond, status); |
6996 | CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask); | |
6997 | CORE_ADDR stm_insn_addr; | |
6998 | uint32_t pc_val; | |
6999 | long offset; | |
7000 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7001 | ||
7002 | /* If condition code fails, there's nothing else to do. */ | |
7003 | if (!store_executed) | |
7004 | return; | |
7005 | ||
7006 | if (dsc->u.block.increment) | |
7007 | { | |
7008 | pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs; | |
7009 | ||
7010 | if (dsc->u.block.before) | |
7011 | pc_stored_at += 4; | |
7012 | } | |
7013 | else | |
7014 | { | |
7015 | pc_stored_at = dsc->u.block.xfer_addr; | |
7016 | ||
7017 | if (dsc->u.block.before) | |
7018 | pc_stored_at -= 4; | |
7019 | } | |
7020 | ||
7021 | pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order); | |
7022 | stm_insn_addr = dsc->scratch_base; | |
7023 | offset = pc_val - stm_insn_addr; | |
7024 | ||
7025 | if (debug_displaced) | |
7026 | fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for " | |
7027 | "STM instruction\n", offset); | |
7028 | ||
7029 | /* Rewrite the stored PC to the proper value for the non-displaced original | |
7030 | instruction. */ | |
7031 | write_memory_unsigned_integer (pc_stored_at, 4, byte_order, | |
7032 | dsc->insn_addr + offset); | |
7033 | } | |
7034 | ||
7035 | /* Clean up an LDM which includes the PC in the register list. We clumped all | |
7036 | the registers in the transferred list into a contiguous range r0...rX (to | |
7037 | avoid loading PC directly and losing control of the debugged program), so we | |
7038 | must undo that here. */ | |
7039 | ||
7040 | static void | |
6e39997a | 7041 | cleanup_block_load_pc (struct gdbarch *gdbarch, |
cca44b1b JB |
7042 | struct regcache *regs, |
7043 | struct displaced_step_closure *dsc) | |
7044 | { | |
36073a92 | 7045 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
22e048c9 | 7046 | int load_executed = condition_true (dsc->u.block.cond, status); |
bf9f652a | 7047 | unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM; |
cca44b1b JB |
7048 | unsigned int regs_loaded = bitcount (mask); |
7049 | unsigned int num_to_shuffle = regs_loaded, clobbered; | |
7050 | ||
7051 | /* The method employed here will fail if the register list is fully populated | |
7052 | (we need to avoid loading PC directly). */ | |
7053 | gdb_assert (num_to_shuffle < 16); | |
7054 | ||
7055 | if (!load_executed) | |
7056 | return; | |
7057 | ||
7058 | clobbered = (1 << num_to_shuffle) - 1; | |
7059 | ||
7060 | while (num_to_shuffle > 0) | |
7061 | { | |
7062 | if ((mask & (1 << write_reg)) != 0) | |
7063 | { | |
7064 | unsigned int read_reg = num_to_shuffle - 1; | |
7065 | ||
7066 | if (read_reg != write_reg) | |
7067 | { | |
36073a92 | 7068 | ULONGEST rval = displaced_read_reg (regs, dsc, read_reg); |
cca44b1b JB |
7069 | displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC); |
7070 | if (debug_displaced) | |
7071 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move " | |
7072 | "loaded register r%d to r%d\n"), read_reg, | |
7073 | write_reg); | |
7074 | } | |
7075 | else if (debug_displaced) | |
7076 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register " | |
7077 | "r%d already in the right place\n"), | |
7078 | write_reg); | |
7079 | ||
7080 | clobbered &= ~(1 << write_reg); | |
7081 | ||
7082 | num_to_shuffle--; | |
7083 | } | |
7084 | ||
7085 | write_reg--; | |
7086 | } | |
7087 | ||
7088 | /* Restore any registers we scribbled over. */ | |
7089 | for (write_reg = 0; clobbered != 0; write_reg++) | |
7090 | { | |
7091 | if ((clobbered & (1 << write_reg)) != 0) | |
7092 | { | |
7093 | displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg], | |
7094 | CANNOT_WRITE_PC); | |
7095 | if (debug_displaced) | |
7096 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored " | |
7097 | "clobbered register r%d\n"), write_reg); | |
7098 | clobbered &= ~(1 << write_reg); | |
7099 | } | |
7100 | } | |
7101 | ||
7102 | /* Perform register writeback manually. */ | |
7103 | if (dsc->u.block.writeback) | |
7104 | { | |
7105 | ULONGEST new_rn_val = dsc->u.block.xfer_addr; | |
7106 | ||
7107 | if (dsc->u.block.increment) | |
7108 | new_rn_val += regs_loaded * 4; | |
7109 | else | |
7110 | new_rn_val -= regs_loaded * 4; | |
7111 | ||
7112 | displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val, | |
7113 | CANNOT_WRITE_PC); | |
7114 | } | |
7115 | } | |
7116 | ||
7117 | /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur | |
7118 | in user-level code (in particular exception return, ldm rn, {...pc}^). */ | |
7119 | ||
7120 | static int | |
7ff120b4 YQ |
7121 | arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, |
7122 | struct regcache *regs, | |
7123 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7124 | { |
7125 | int load = bit (insn, 20); | |
7126 | int user = bit (insn, 22); | |
7127 | int increment = bit (insn, 23); | |
7128 | int before = bit (insn, 24); | |
7129 | int writeback = bit (insn, 21); | |
7130 | int rn = bits (insn, 16, 19); | |
cca44b1b | 7131 | |
0963b4bd MS |
7132 | /* Block transfers which don't mention PC can be run directly |
7133 | out-of-line. */ | |
bf9f652a | 7134 | if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0) |
7ff120b4 | 7135 | return arm_copy_unmodified (gdbarch, insn, "ldm/stm", dsc); |
cca44b1b | 7136 | |
bf9f652a | 7137 | if (rn == ARM_PC_REGNUM) |
cca44b1b | 7138 | { |
0963b4bd MS |
7139 | warning (_("displaced: Unpredictable LDM or STM with " |
7140 | "base register r15")); | |
7ff120b4 | 7141 | return arm_copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc); |
cca44b1b JB |
7142 | } |
7143 | ||
7144 | if (debug_displaced) | |
7145 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " | |
7146 | "%.8lx\n", (unsigned long) insn); | |
7147 | ||
36073a92 | 7148 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
cca44b1b JB |
7149 | dsc->u.block.rn = rn; |
7150 | ||
7151 | dsc->u.block.load = load; | |
7152 | dsc->u.block.user = user; | |
7153 | dsc->u.block.increment = increment; | |
7154 | dsc->u.block.before = before; | |
7155 | dsc->u.block.writeback = writeback; | |
7156 | dsc->u.block.cond = bits (insn, 28, 31); | |
7157 | ||
7158 | dsc->u.block.regmask = insn & 0xffff; | |
7159 | ||
7160 | if (load) | |
7161 | { | |
7162 | if ((insn & 0xffff) == 0xffff) | |
7163 | { | |
7164 | /* LDM with a fully-populated register list. This case is | |
7165 | particularly tricky. Implement for now by fully emulating the | |
7166 | instruction (which might not behave perfectly in all cases, but | |
7167 | these instructions should be rare enough for that not to matter | |
7168 | too much). */ | |
7169 | dsc->modinsn[0] = ARM_NOP; | |
7170 | ||
7171 | dsc->cleanup = &cleanup_block_load_all; | |
7172 | } | |
7173 | else | |
7174 | { | |
7175 | /* LDM of a list of registers which includes PC. Implement by | |
7176 | rewriting the list of registers to be transferred into a | |
7177 | contiguous chunk r0...rX before doing the transfer, then shuffling | |
7178 | registers into the correct places in the cleanup routine. */ | |
7179 | unsigned int regmask = insn & 0xffff; | |
7180 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
7181 | unsigned int to = 0, from = 0, i, new_rn; | |
7182 | ||
7183 | for (i = 0; i < num_in_list; i++) | |
36073a92 | 7184 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b JB |
7185 | |
7186 | /* Writeback makes things complicated. We need to avoid clobbering | |
7187 | the base register with one of the registers in our modified | |
7188 | register list, but just using a different register can't work in | |
7189 | all cases, e.g.: | |
7190 | ||
7191 | ldm r14!, {r0-r13,pc} | |
7192 | ||
7193 | which would need to be rewritten as: | |
7194 | ||
7195 | ldm rN!, {r0-r14} | |
7196 | ||
7197 | but that can't work, because there's no free register for N. | |
7198 | ||
7199 | Solve this by turning off the writeback bit, and emulating | |
7200 | writeback manually in the cleanup routine. */ | |
7201 | ||
7202 | if (writeback) | |
7203 | insn &= ~(1 << 21); | |
7204 | ||
7205 | new_regmask = (1 << num_in_list) - 1; | |
7206 | ||
7207 | if (debug_displaced) | |
7208 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
7209 | "{..., pc}: original reg list %.4x, modified " | |
7210 | "list %.4x\n"), rn, writeback ? "!" : "", | |
7211 | (int) insn & 0xffff, new_regmask); | |
7212 | ||
7213 | dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff); | |
7214 | ||
7215 | dsc->cleanup = &cleanup_block_load_pc; | |
7216 | } | |
7217 | } | |
7218 | else | |
7219 | { | |
7220 | /* STM of a list of registers which includes PC. Run the instruction | |
7221 | as-is, but out of line: this will store the wrong value for the PC, | |
7222 | so we must manually fix up the memory in the cleanup routine. | |
7223 | Doing things this way has the advantage that we can auto-detect | |
7224 | the offset of the PC write (which is architecture-dependent) in | |
7225 | the cleanup routine. */ | |
7226 | dsc->modinsn[0] = insn; | |
7227 | ||
7228 | dsc->cleanup = &cleanup_block_store_pc; | |
7229 | } | |
7230 | ||
7231 | return 0; | |
7232 | } | |
7233 | ||
34518530 YQ |
7234 | static int |
7235 | thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
7236 | struct regcache *regs, | |
7237 | struct displaced_step_closure *dsc) | |
cca44b1b | 7238 | { |
34518530 YQ |
7239 | int rn = bits (insn1, 0, 3); |
7240 | int load = bit (insn1, 4); | |
7241 | int writeback = bit (insn1, 5); | |
cca44b1b | 7242 | |
34518530 YQ |
7243 | /* Block transfers which don't mention PC can be run directly |
7244 | out-of-line. */ | |
7245 | if (rn != ARM_PC_REGNUM && (insn2 & 0x8000) == 0) | |
7246 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ldm/stm", dsc); | |
7ff120b4 | 7247 | |
34518530 YQ |
7248 | if (rn == ARM_PC_REGNUM) |
7249 | { | |
7250 | warning (_("displaced: Unpredictable LDM or STM with " | |
7251 | "base register r15")); | |
7252 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7253 | "unpredictable ldm/stm", dsc); | |
7254 | } | |
cca44b1b JB |
7255 | |
7256 | if (debug_displaced) | |
34518530 YQ |
7257 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " |
7258 | "%.4x%.4x\n", insn1, insn2); | |
cca44b1b | 7259 | |
34518530 YQ |
7260 | /* Clear bit 13, since it should be always zero. */ |
7261 | dsc->u.block.regmask = (insn2 & 0xdfff); | |
7262 | dsc->u.block.rn = rn; | |
cca44b1b | 7263 | |
34518530 YQ |
7264 | dsc->u.block.load = load; |
7265 | dsc->u.block.user = 0; | |
7266 | dsc->u.block.increment = bit (insn1, 7); | |
7267 | dsc->u.block.before = bit (insn1, 8); | |
7268 | dsc->u.block.writeback = writeback; | |
7269 | dsc->u.block.cond = INST_AL; | |
7270 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 7271 | |
34518530 YQ |
7272 | if (load) |
7273 | { | |
7274 | if (dsc->u.block.regmask == 0xffff) | |
7275 | { | |
7276 | /* This branch is impossible to happen. */ | |
7277 | gdb_assert (0); | |
7278 | } | |
7279 | else | |
7280 | { | |
7281 | unsigned int regmask = dsc->u.block.regmask; | |
7282 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
7283 | unsigned int to = 0, from = 0, i, new_rn; | |
7284 | ||
7285 | for (i = 0; i < num_in_list; i++) | |
7286 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
7287 | ||
7288 | if (writeback) | |
7289 | insn1 &= ~(1 << 5); | |
7290 | ||
7291 | new_regmask = (1 << num_in_list) - 1; | |
7292 | ||
7293 | if (debug_displaced) | |
7294 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
7295 | "{..., pc}: original reg list %.4x, modified " | |
7296 | "list %.4x\n"), rn, writeback ? "!" : "", | |
7297 | (int) dsc->u.block.regmask, new_regmask); | |
7298 | ||
7299 | dsc->modinsn[0] = insn1; | |
7300 | dsc->modinsn[1] = (new_regmask & 0xffff); | |
7301 | dsc->numinsns = 2; | |
7302 | ||
7303 | dsc->cleanup = &cleanup_block_load_pc; | |
7304 | } | |
7305 | } | |
7306 | else | |
7307 | { | |
7308 | dsc->modinsn[0] = insn1; | |
7309 | dsc->modinsn[1] = insn2; | |
7310 | dsc->numinsns = 2; | |
7311 | dsc->cleanup = &cleanup_block_store_pc; | |
7312 | } | |
7313 | return 0; | |
7314 | } | |
7315 | ||
7316 | /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden | |
7317 | for Linux, where some SVC instructions must be treated specially. */ | |
7318 | ||
7319 | static void | |
7320 | cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
7321 | struct displaced_step_closure *dsc) | |
7322 | { | |
7323 | CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size; | |
7324 | ||
7325 | if (debug_displaced) | |
7326 | fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at " | |
7327 | "%.8lx\n", (unsigned long) resume_addr); | |
7328 | ||
7329 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC); | |
7330 | } | |
7331 | ||
7332 | ||
7333 | /* Common copy routine for svc instruciton. */ | |
7334 | ||
7335 | static int | |
7336 | install_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
7337 | struct displaced_step_closure *dsc) | |
7338 | { | |
7339 | /* Preparation: none. | |
7340 | Insn: unmodified svc. | |
7341 | Cleanup: pc <- insn_addr + insn_size. */ | |
7342 | ||
7343 | /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next | |
7344 | instruction. */ | |
7345 | dsc->wrote_to_pc = 1; | |
7346 | ||
7347 | /* Allow OS-specific code to override SVC handling. */ | |
bd18283a YQ |
7348 | if (dsc->u.svc.copy_svc_os) |
7349 | return dsc->u.svc.copy_svc_os (gdbarch, regs, dsc); | |
7350 | else | |
7351 | { | |
7352 | dsc->cleanup = &cleanup_svc; | |
7353 | return 0; | |
7354 | } | |
34518530 YQ |
7355 | } |
7356 | ||
7357 | static int | |
7358 | arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn, | |
7359 | struct regcache *regs, struct displaced_step_closure *dsc) | |
7360 | { | |
7361 | ||
7362 | if (debug_displaced) | |
7363 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n", | |
7364 | (unsigned long) insn); | |
7365 | ||
7366 | dsc->modinsn[0] = insn; | |
7367 | ||
7368 | return install_svc (gdbarch, regs, dsc); | |
7369 | } | |
7370 | ||
7371 | static int | |
7372 | thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn, | |
7373 | struct regcache *regs, struct displaced_step_closure *dsc) | |
7374 | { | |
7375 | ||
7376 | if (debug_displaced) | |
7377 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.4x\n", | |
7378 | insn); | |
bd18283a | 7379 | |
34518530 YQ |
7380 | dsc->modinsn[0] = insn; |
7381 | ||
7382 | return install_svc (gdbarch, regs, dsc); | |
cca44b1b JB |
7383 | } |
7384 | ||
7385 | /* Copy undefined instructions. */ | |
7386 | ||
7387 | static int | |
7ff120b4 YQ |
7388 | arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn, |
7389 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7390 | { |
7391 | if (debug_displaced) | |
0963b4bd MS |
7392 | fprintf_unfiltered (gdb_stdlog, |
7393 | "displaced: copying undefined insn %.8lx\n", | |
cca44b1b JB |
7394 | (unsigned long) insn); |
7395 | ||
7396 | dsc->modinsn[0] = insn; | |
7397 | ||
7398 | return 0; | |
7399 | } | |
7400 | ||
34518530 YQ |
7401 | static int |
7402 | thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
7403 | struct displaced_step_closure *dsc) | |
7404 | { | |
7405 | ||
7406 | if (debug_displaced) | |
7407 | fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn " | |
7408 | "%.4x %.4x\n", (unsigned short) insn1, | |
7409 | (unsigned short) insn2); | |
7410 | ||
7411 | dsc->modinsn[0] = insn1; | |
7412 | dsc->modinsn[1] = insn2; | |
7413 | dsc->numinsns = 2; | |
7414 | ||
7415 | return 0; | |
7416 | } | |
7417 | ||
cca44b1b JB |
7418 | /* Copy unpredictable instructions. */ |
7419 | ||
7420 | static int | |
7ff120b4 YQ |
7421 | arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn, |
7422 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7423 | { |
7424 | if (debug_displaced) | |
7425 | fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn " | |
7426 | "%.8lx\n", (unsigned long) insn); | |
7427 | ||
7428 | dsc->modinsn[0] = insn; | |
7429 | ||
7430 | return 0; | |
7431 | } | |
7432 | ||
7433 | /* The decode_* functions are instruction decoding helpers. They mostly follow | |
7434 | the presentation in the ARM ARM. */ | |
7435 | ||
7436 | static int | |
7ff120b4 YQ |
7437 | arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn, |
7438 | struct regcache *regs, | |
7439 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7440 | { |
7441 | unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7); | |
7442 | unsigned int rn = bits (insn, 16, 19); | |
7443 | ||
7444 | if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0) | |
7ff120b4 | 7445 | return arm_copy_unmodified (gdbarch, insn, "cps", dsc); |
cca44b1b | 7446 | else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1) |
7ff120b4 | 7447 | return arm_copy_unmodified (gdbarch, insn, "setend", dsc); |
cca44b1b | 7448 | else if ((op1 & 0x60) == 0x20) |
7ff120b4 | 7449 | return arm_copy_unmodified (gdbarch, insn, "neon dataproc", dsc); |
cca44b1b | 7450 | else if ((op1 & 0x71) == 0x40) |
7ff120b4 YQ |
7451 | return arm_copy_unmodified (gdbarch, insn, "neon elt/struct load/store", |
7452 | dsc); | |
cca44b1b | 7453 | else if ((op1 & 0x77) == 0x41) |
7ff120b4 | 7454 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 7455 | else if ((op1 & 0x77) == 0x45) |
7ff120b4 | 7456 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pli. */ |
cca44b1b JB |
7457 | else if ((op1 & 0x77) == 0x51) |
7458 | { | |
7459 | if (rn != 0xf) | |
7ff120b4 | 7460 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b | 7461 | else |
7ff120b4 | 7462 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
7463 | } |
7464 | else if ((op1 & 0x77) == 0x55) | |
7ff120b4 | 7465 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b JB |
7466 | else if (op1 == 0x57) |
7467 | switch (op2) | |
7468 | { | |
7ff120b4 YQ |
7469 | case 0x1: return arm_copy_unmodified (gdbarch, insn, "clrex", dsc); |
7470 | case 0x4: return arm_copy_unmodified (gdbarch, insn, "dsb", dsc); | |
7471 | case 0x5: return arm_copy_unmodified (gdbarch, insn, "dmb", dsc); | |
7472 | case 0x6: return arm_copy_unmodified (gdbarch, insn, "isb", dsc); | |
7473 | default: return arm_copy_unpred (gdbarch, insn, dsc); | |
cca44b1b JB |
7474 | } |
7475 | else if ((op1 & 0x63) == 0x43) | |
7ff120b4 | 7476 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
7477 | else if ((op2 & 0x1) == 0x0) |
7478 | switch (op1 & ~0x80) | |
7479 | { | |
7480 | case 0x61: | |
7ff120b4 | 7481 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 7482 | case 0x65: |
7ff120b4 | 7483 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */ |
cca44b1b JB |
7484 | case 0x71: case 0x75: |
7485 | /* pld/pldw reg. */ | |
7ff120b4 | 7486 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7487 | case 0x63: case 0x67: case 0x73: case 0x77: |
7ff120b4 | 7488 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b | 7489 | default: |
7ff120b4 | 7490 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7491 | } |
7492 | else | |
7ff120b4 | 7493 | return arm_copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */ |
cca44b1b JB |
7494 | } |
7495 | ||
7496 | static int | |
7ff120b4 YQ |
7497 | arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn, |
7498 | struct regcache *regs, | |
7499 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7500 | { |
7501 | if (bit (insn, 27) == 0) | |
7ff120b4 | 7502 | return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7503 | /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */ |
7504 | else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20)) | |
7505 | { | |
7506 | case 0x0: case 0x2: | |
7ff120b4 | 7507 | return arm_copy_unmodified (gdbarch, insn, "srs", dsc); |
cca44b1b JB |
7508 | |
7509 | case 0x1: case 0x3: | |
7ff120b4 | 7510 | return arm_copy_unmodified (gdbarch, insn, "rfe", dsc); |
cca44b1b JB |
7511 | |
7512 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7ff120b4 | 7513 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7514 | |
7515 | case 0x8: | |
7516 | switch ((insn & 0xe00000) >> 21) | |
7517 | { | |
7518 | case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7: | |
7519 | /* stc/stc2. */ | |
7ff120b4 | 7520 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7521 | |
7522 | case 0x2: | |
7ff120b4 | 7523 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b JB |
7524 | |
7525 | default: | |
7ff120b4 | 7526 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7527 | } |
7528 | ||
7529 | case 0x9: | |
7530 | { | |
7531 | int rn_f = (bits (insn, 16, 19) == 0xf); | |
7532 | switch ((insn & 0xe00000) >> 21) | |
7533 | { | |
7534 | case 0x1: case 0x3: | |
7535 | /* ldc/ldc2 imm (undefined for rn == pc). */ | |
7ff120b4 YQ |
7536 | return rn_f ? arm_copy_undef (gdbarch, insn, dsc) |
7537 | : arm_copy_copro_load_store (gdbarch, insn, regs, dsc); | |
cca44b1b JB |
7538 | |
7539 | case 0x2: | |
7ff120b4 | 7540 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
7541 | |
7542 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7543 | /* ldc/ldc2 lit (undefined for rn != pc). */ | |
7ff120b4 YQ |
7544 | return rn_f ? arm_copy_copro_load_store (gdbarch, insn, regs, dsc) |
7545 | : arm_copy_undef (gdbarch, insn, dsc); | |
cca44b1b JB |
7546 | |
7547 | default: | |
7ff120b4 | 7548 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7549 | } |
7550 | } | |
7551 | ||
7552 | case 0xa: | |
7ff120b4 | 7553 | return arm_copy_unmodified (gdbarch, insn, "stc/stc2", dsc); |
cca44b1b JB |
7554 | |
7555 | case 0xb: | |
7556 | if (bits (insn, 16, 19) == 0xf) | |
7557 | /* ldc/ldc2 lit. */ | |
7ff120b4 | 7558 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 7559 | else |
7ff120b4 | 7560 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7561 | |
7562 | case 0xc: | |
7563 | if (bit (insn, 4)) | |
7ff120b4 | 7564 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 7565 | else |
7ff120b4 | 7566 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7567 | |
7568 | case 0xd: | |
7569 | if (bit (insn, 4)) | |
7ff120b4 | 7570 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 7571 | else |
7ff120b4 | 7572 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7573 | |
7574 | default: | |
7ff120b4 | 7575 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7576 | } |
7577 | } | |
7578 | ||
7579 | /* Decode miscellaneous instructions in dp/misc encoding space. */ | |
7580 | ||
7581 | static int | |
7ff120b4 YQ |
7582 | arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn, |
7583 | struct regcache *regs, | |
7584 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7585 | { |
7586 | unsigned int op2 = bits (insn, 4, 6); | |
7587 | unsigned int op = bits (insn, 21, 22); | |
7588 | unsigned int op1 = bits (insn, 16, 19); | |
7589 | ||
7590 | switch (op2) | |
7591 | { | |
7592 | case 0x0: | |
7ff120b4 | 7593 | return arm_copy_unmodified (gdbarch, insn, "mrs/msr", dsc); |
cca44b1b JB |
7594 | |
7595 | case 0x1: | |
7596 | if (op == 0x1) /* bx. */ | |
7ff120b4 | 7597 | return arm_copy_bx_blx_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7598 | else if (op == 0x3) |
7ff120b4 | 7599 | return arm_copy_unmodified (gdbarch, insn, "clz", dsc); |
cca44b1b | 7600 | else |
7ff120b4 | 7601 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7602 | |
7603 | case 0x2: | |
7604 | if (op == 0x1) | |
7605 | /* Not really supported. */ | |
7ff120b4 | 7606 | return arm_copy_unmodified (gdbarch, insn, "bxj", dsc); |
cca44b1b | 7607 | else |
7ff120b4 | 7608 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7609 | |
7610 | case 0x3: | |
7611 | if (op == 0x1) | |
7ff120b4 | 7612 | return arm_copy_bx_blx_reg (gdbarch, insn, |
0963b4bd | 7613 | regs, dsc); /* blx register. */ |
cca44b1b | 7614 | else |
7ff120b4 | 7615 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7616 | |
7617 | case 0x5: | |
7ff120b4 | 7618 | return arm_copy_unmodified (gdbarch, insn, "saturating add/sub", dsc); |
cca44b1b JB |
7619 | |
7620 | case 0x7: | |
7621 | if (op == 0x1) | |
7ff120b4 | 7622 | return arm_copy_unmodified (gdbarch, insn, "bkpt", dsc); |
cca44b1b JB |
7623 | else if (op == 0x3) |
7624 | /* Not really supported. */ | |
7ff120b4 | 7625 | return arm_copy_unmodified (gdbarch, insn, "smc", dsc); |
cca44b1b JB |
7626 | |
7627 | default: | |
7ff120b4 | 7628 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7629 | } |
7630 | } | |
7631 | ||
7632 | static int | |
7ff120b4 YQ |
7633 | arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, |
7634 | struct regcache *regs, | |
7635 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7636 | { |
7637 | if (bit (insn, 25)) | |
7638 | switch (bits (insn, 20, 24)) | |
7639 | { | |
7640 | case 0x10: | |
7ff120b4 | 7641 | return arm_copy_unmodified (gdbarch, insn, "movw", dsc); |
cca44b1b JB |
7642 | |
7643 | case 0x14: | |
7ff120b4 | 7644 | return arm_copy_unmodified (gdbarch, insn, "movt", dsc); |
cca44b1b JB |
7645 | |
7646 | case 0x12: case 0x16: | |
7ff120b4 | 7647 | return arm_copy_unmodified (gdbarch, insn, "msr imm", dsc); |
cca44b1b JB |
7648 | |
7649 | default: | |
7ff120b4 | 7650 | return arm_copy_alu_imm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7651 | } |
7652 | else | |
7653 | { | |
7654 | uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7); | |
7655 | ||
7656 | if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0) | |
7ff120b4 | 7657 | return arm_copy_alu_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7658 | else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1) |
7ff120b4 | 7659 | return arm_copy_alu_shifted_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7660 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0) |
7ff120b4 | 7661 | return arm_decode_miscellaneous (gdbarch, insn, regs, dsc); |
cca44b1b | 7662 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8) |
7ff120b4 | 7663 | return arm_copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc); |
cca44b1b | 7664 | else if ((op1 & 0x10) == 0x00 && op2 == 0x9) |
7ff120b4 | 7665 | return arm_copy_unmodified (gdbarch, insn, "mul/mla", dsc); |
cca44b1b | 7666 | else if ((op1 & 0x10) == 0x10 && op2 == 0x9) |
7ff120b4 | 7667 | return arm_copy_unmodified (gdbarch, insn, "synch", dsc); |
cca44b1b JB |
7668 | else if (op2 == 0xb || (op2 & 0xd) == 0xd) |
7669 | /* 2nd arg means "unpriveleged". */ | |
7ff120b4 YQ |
7670 | return arm_copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs, |
7671 | dsc); | |
cca44b1b JB |
7672 | } |
7673 | ||
7674 | /* Should be unreachable. */ | |
7675 | return 1; | |
7676 | } | |
7677 | ||
7678 | static int | |
7ff120b4 YQ |
7679 | arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn, |
7680 | struct regcache *regs, | |
7681 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7682 | { |
7683 | int a = bit (insn, 25), b = bit (insn, 4); | |
7684 | uint32_t op1 = bits (insn, 20, 24); | |
7685 | int rn_f = bits (insn, 16, 19) == 0xf; | |
7686 | ||
7687 | if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02) | |
7688 | || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b)) | |
0f6f04ba | 7689 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 0); |
cca44b1b JB |
7690 | else if ((!a && (op1 & 0x17) == 0x02) |
7691 | || (a && (op1 & 0x17) == 0x02 && !b)) | |
0f6f04ba | 7692 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 1); |
cca44b1b JB |
7693 | else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03) |
7694 | || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b)) | |
0f6f04ba | 7695 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 0); |
cca44b1b JB |
7696 | else if ((!a && (op1 & 0x17) == 0x03) |
7697 | || (a && (op1 & 0x17) == 0x03 && !b)) | |
0f6f04ba | 7698 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 1); |
cca44b1b JB |
7699 | else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06) |
7700 | || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b)) | |
7ff120b4 | 7701 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0); |
cca44b1b JB |
7702 | else if ((!a && (op1 & 0x17) == 0x06) |
7703 | || (a && (op1 & 0x17) == 0x06 && !b)) | |
7ff120b4 | 7704 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1); |
cca44b1b JB |
7705 | else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07) |
7706 | || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b)) | |
7ff120b4 | 7707 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0); |
cca44b1b JB |
7708 | else if ((!a && (op1 & 0x17) == 0x07) |
7709 | || (a && (op1 & 0x17) == 0x07 && !b)) | |
7ff120b4 | 7710 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1); |
cca44b1b JB |
7711 | |
7712 | /* Should be unreachable. */ | |
7713 | return 1; | |
7714 | } | |
7715 | ||
7716 | static int | |
7ff120b4 YQ |
7717 | arm_decode_media (struct gdbarch *gdbarch, uint32_t insn, |
7718 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7719 | { |
7720 | switch (bits (insn, 20, 24)) | |
7721 | { | |
7722 | case 0x00: case 0x01: case 0x02: case 0x03: | |
7ff120b4 | 7723 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc); |
cca44b1b JB |
7724 | |
7725 | case 0x04: case 0x05: case 0x06: case 0x07: | |
7ff120b4 | 7726 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc); |
cca44b1b JB |
7727 | |
7728 | case 0x08: case 0x09: case 0x0a: case 0x0b: | |
7729 | case 0x0c: case 0x0d: case 0x0e: case 0x0f: | |
7ff120b4 | 7730 | return arm_copy_unmodified (gdbarch, insn, |
cca44b1b JB |
7731 | "decode/pack/unpack/saturate/reverse", dsc); |
7732 | ||
7733 | case 0x18: | |
7734 | if (bits (insn, 5, 7) == 0) /* op2. */ | |
7735 | { | |
7736 | if (bits (insn, 12, 15) == 0xf) | |
7ff120b4 | 7737 | return arm_copy_unmodified (gdbarch, insn, "usad8", dsc); |
cca44b1b | 7738 | else |
7ff120b4 | 7739 | return arm_copy_unmodified (gdbarch, insn, "usada8", dsc); |
cca44b1b JB |
7740 | } |
7741 | else | |
7ff120b4 | 7742 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7743 | |
7744 | case 0x1a: case 0x1b: | |
7745 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 7746 | return arm_copy_unmodified (gdbarch, insn, "sbfx", dsc); |
cca44b1b | 7747 | else |
7ff120b4 | 7748 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7749 | |
7750 | case 0x1c: case 0x1d: | |
7751 | if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */ | |
7752 | { | |
7753 | if (bits (insn, 0, 3) == 0xf) | |
7ff120b4 | 7754 | return arm_copy_unmodified (gdbarch, insn, "bfc", dsc); |
cca44b1b | 7755 | else |
7ff120b4 | 7756 | return arm_copy_unmodified (gdbarch, insn, "bfi", dsc); |
cca44b1b JB |
7757 | } |
7758 | else | |
7ff120b4 | 7759 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7760 | |
7761 | case 0x1e: case 0x1f: | |
7762 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 7763 | return arm_copy_unmodified (gdbarch, insn, "ubfx", dsc); |
cca44b1b | 7764 | else |
7ff120b4 | 7765 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7766 | } |
7767 | ||
7768 | /* Should be unreachable. */ | |
7769 | return 1; | |
7770 | } | |
7771 | ||
7772 | static int | |
7ff120b4 YQ |
7773 | arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn, |
7774 | struct regcache *regs, | |
7775 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7776 | { |
7777 | if (bit (insn, 25)) | |
7ff120b4 | 7778 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b | 7779 | else |
7ff120b4 | 7780 | return arm_copy_block_xfer (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7781 | } |
7782 | ||
7783 | static int | |
7ff120b4 YQ |
7784 | arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn, |
7785 | struct regcache *regs, | |
7786 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7787 | { |
7788 | unsigned int opcode = bits (insn, 20, 24); | |
7789 | ||
7790 | switch (opcode) | |
7791 | { | |
7792 | case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */ | |
7ff120b4 | 7793 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc); |
cca44b1b JB |
7794 | |
7795 | case 0x08: case 0x0a: case 0x0c: case 0x0e: | |
7796 | case 0x12: case 0x16: | |
7ff120b4 | 7797 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc); |
cca44b1b JB |
7798 | |
7799 | case 0x09: case 0x0b: case 0x0d: case 0x0f: | |
7800 | case 0x13: case 0x17: | |
7ff120b4 | 7801 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc); |
cca44b1b JB |
7802 | |
7803 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
7804 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
7805 | /* Note: no writeback for these instructions. Bit 25 will always be | |
7806 | zero though (via caller), so the following works OK. */ | |
7ff120b4 | 7807 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7808 | } |
7809 | ||
7810 | /* Should be unreachable. */ | |
7811 | return 1; | |
7812 | } | |
7813 | ||
34518530 YQ |
7814 | /* Decode shifted register instructions. */ |
7815 | ||
7816 | static int | |
7817 | thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1, | |
7818 | uint16_t insn2, struct regcache *regs, | |
7819 | struct displaced_step_closure *dsc) | |
7820 | { | |
7821 | /* PC is only allowed to be used in instruction MOV. */ | |
7822 | ||
7823 | unsigned int op = bits (insn1, 5, 8); | |
7824 | unsigned int rn = bits (insn1, 0, 3); | |
7825 | ||
7826 | if (op == 0x2 && rn == 0xf) /* MOV */ | |
7827 | return thumb2_copy_alu_imm (gdbarch, insn1, insn2, regs, dsc); | |
7828 | else | |
7829 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7830 | "dp (shift reg)", dsc); | |
7831 | } | |
7832 | ||
7833 | ||
7834 | /* Decode extension register load/store. Exactly the same as | |
7835 | arm_decode_ext_reg_ld_st. */ | |
7836 | ||
7837 | static int | |
7838 | thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1, | |
7839 | uint16_t insn2, struct regcache *regs, | |
7840 | struct displaced_step_closure *dsc) | |
7841 | { | |
7842 | unsigned int opcode = bits (insn1, 4, 8); | |
7843 | ||
7844 | switch (opcode) | |
7845 | { | |
7846 | case 0x04: case 0x05: | |
7847 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7848 | "vfp/neon vmov", dsc); | |
7849 | ||
7850 | case 0x08: case 0x0c: /* 01x00 */ | |
7851 | case 0x0a: case 0x0e: /* 01x10 */ | |
7852 | case 0x12: case 0x16: /* 10x10 */ | |
7853 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7854 | "vfp/neon vstm/vpush", dsc); | |
7855 | ||
7856 | case 0x09: case 0x0d: /* 01x01 */ | |
7857 | case 0x0b: case 0x0f: /* 01x11 */ | |
7858 | case 0x13: case 0x17: /* 10x11 */ | |
7859 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7860 | "vfp/neon vldm/vpop", dsc); | |
7861 | ||
7862 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
7863 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7864 | "vstr", dsc); | |
7865 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
7866 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, regs, dsc); | |
7867 | } | |
7868 | ||
7869 | /* Should be unreachable. */ | |
7870 | return 1; | |
7871 | } | |
7872 | ||
cca44b1b | 7873 | static int |
7ff120b4 YQ |
7874 | arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to, |
7875 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
7876 | { |
7877 | unsigned int op1 = bits (insn, 20, 25); | |
7878 | int op = bit (insn, 4); | |
7879 | unsigned int coproc = bits (insn, 8, 11); | |
7880 | unsigned int rn = bits (insn, 16, 19); | |
7881 | ||
7882 | if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa) | |
7ff120b4 | 7883 | return arm_decode_ext_reg_ld_st (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7884 | else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00 |
7885 | && (coproc & 0xe) != 0xa) | |
7886 | /* stc/stc2. */ | |
7ff120b4 | 7887 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7888 | else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00 |
7889 | && (coproc & 0xe) != 0xa) | |
7890 | /* ldc/ldc2 imm/lit. */ | |
7ff120b4 | 7891 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 7892 | else if ((op1 & 0x3e) == 0x00) |
7ff120b4 | 7893 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b | 7894 | else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa) |
7ff120b4 | 7895 | return arm_copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc); |
cca44b1b | 7896 | else if (op1 == 0x04 && (coproc & 0xe) != 0xa) |
7ff120b4 | 7897 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b | 7898 | else if (op1 == 0x05 && (coproc & 0xe) != 0xa) |
7ff120b4 | 7899 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
7900 | else if ((op1 & 0x30) == 0x20 && !op) |
7901 | { | |
7902 | if ((coproc & 0xe) == 0xa) | |
7ff120b4 | 7903 | return arm_copy_unmodified (gdbarch, insn, "vfp dataproc", dsc); |
cca44b1b | 7904 | else |
7ff120b4 | 7905 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7906 | } |
7907 | else if ((op1 & 0x30) == 0x20 && op) | |
7ff120b4 | 7908 | return arm_copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc); |
cca44b1b | 7909 | else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 7910 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 7911 | else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 7912 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 7913 | else if ((op1 & 0x30) == 0x30) |
7ff120b4 | 7914 | return arm_copy_svc (gdbarch, insn, regs, dsc); |
cca44b1b | 7915 | else |
7ff120b4 | 7916 | return arm_copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */ |
cca44b1b JB |
7917 | } |
7918 | ||
34518530 YQ |
7919 | static int |
7920 | thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1, | |
7921 | uint16_t insn2, struct regcache *regs, | |
7922 | struct displaced_step_closure *dsc) | |
7923 | { | |
7924 | unsigned int coproc = bits (insn2, 8, 11); | |
7925 | unsigned int op1 = bits (insn1, 4, 9); | |
7926 | unsigned int bit_5_8 = bits (insn1, 5, 8); | |
7927 | unsigned int bit_9 = bit (insn1, 9); | |
7928 | unsigned int bit_4 = bit (insn1, 4); | |
7929 | unsigned int rn = bits (insn1, 0, 3); | |
7930 | ||
7931 | if (bit_9 == 0) | |
7932 | { | |
7933 | if (bit_5_8 == 2) | |
7934 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7935 | "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2", | |
7936 | dsc); | |
7937 | else if (bit_5_8 == 0) /* UNDEFINED. */ | |
7938 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
7939 | else | |
7940 | { | |
7941 | /*coproc is 101x. SIMD/VFP, ext registers load/store. */ | |
7942 | if ((coproc & 0xe) == 0xa) | |
7943 | return thumb2_decode_ext_reg_ld_st (gdbarch, insn1, insn2, regs, | |
7944 | dsc); | |
7945 | else /* coproc is not 101x. */ | |
7946 | { | |
7947 | if (bit_4 == 0) /* STC/STC2. */ | |
7948 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7949 | "stc/stc2", dsc); | |
7950 | else /* LDC/LDC2 {literal, immeidate}. */ | |
7951 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, | |
7952 | regs, dsc); | |
7953 | } | |
7954 | } | |
7955 | } | |
7956 | else | |
7957 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "coproc", dsc); | |
7958 | ||
7959 | return 0; | |
7960 | } | |
7961 | ||
7962 | static void | |
7963 | install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs, | |
7964 | struct displaced_step_closure *dsc, int rd) | |
7965 | { | |
7966 | /* ADR Rd, #imm | |
7967 | ||
7968 | Rewrite as: | |
7969 | ||
7970 | Preparation: Rd <- PC | |
7971 | Insn: ADD Rd, #imm | |
7972 | Cleanup: Null. | |
7973 | */ | |
7974 | ||
7975 | /* Rd <- PC */ | |
7976 | int val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
7977 | displaced_write_reg (regs, dsc, rd, val, CANNOT_WRITE_PC); | |
7978 | } | |
7979 | ||
7980 | static int | |
7981 | thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs, | |
7982 | struct displaced_step_closure *dsc, | |
7983 | int rd, unsigned int imm) | |
7984 | { | |
7985 | ||
7986 | /* Encoding T2: ADDS Rd, #imm */ | |
7987 | dsc->modinsn[0] = (0x3000 | (rd << 8) | imm); | |
7988 | ||
7989 | install_pc_relative (gdbarch, regs, dsc, rd); | |
7990 | ||
7991 | return 0; | |
7992 | } | |
7993 | ||
7994 | static int | |
7995 | thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn, | |
7996 | struct regcache *regs, | |
7997 | struct displaced_step_closure *dsc) | |
7998 | { | |
7999 | unsigned int rd = bits (insn, 8, 10); | |
8000 | unsigned int imm8 = bits (insn, 0, 7); | |
8001 | ||
8002 | if (debug_displaced) | |
8003 | fprintf_unfiltered (gdb_stdlog, | |
8004 | "displaced: copying thumb adr r%d, #%d insn %.4x\n", | |
8005 | rd, imm8, insn); | |
8006 | ||
8007 | return thumb_copy_pc_relative_16bit (gdbarch, regs, dsc, rd, imm8); | |
8008 | } | |
8009 | ||
8010 | static int | |
8011 | thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
8012 | uint16_t insn2, struct regcache *regs, | |
8013 | struct displaced_step_closure *dsc) | |
8014 | { | |
8015 | unsigned int rd = bits (insn2, 8, 11); | |
8016 | /* Since immediate has the same encoding in ADR ADD and SUB, so we simply | |
8017 | extract raw immediate encoding rather than computing immediate. When | |
8018 | generating ADD or SUB instruction, we can simply perform OR operation to | |
8019 | set immediate into ADD. */ | |
8020 | unsigned int imm_3_8 = insn2 & 0x70ff; | |
8021 | unsigned int imm_i = insn1 & 0x0400; /* Clear all bits except bit 10. */ | |
8022 | ||
8023 | if (debug_displaced) | |
8024 | fprintf_unfiltered (gdb_stdlog, | |
8025 | "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n", | |
8026 | rd, imm_i, imm_3_8, insn1, insn2); | |
8027 | ||
8028 | if (bit (insn1, 7)) /* Encoding T2 */ | |
8029 | { | |
8030 | /* Encoding T3: SUB Rd, Rd, #imm */ | |
8031 | dsc->modinsn[0] = (0xf1a0 | rd | imm_i); | |
8032 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
8033 | } | |
8034 | else /* Encoding T3 */ | |
8035 | { | |
8036 | /* Encoding T3: ADD Rd, Rd, #imm */ | |
8037 | dsc->modinsn[0] = (0xf100 | rd | imm_i); | |
8038 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
8039 | } | |
8040 | dsc->numinsns = 2; | |
8041 | ||
8042 | install_pc_relative (gdbarch, regs, dsc, rd); | |
8043 | ||
8044 | return 0; | |
8045 | } | |
8046 | ||
8047 | static int | |
8048 | thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, unsigned short insn1, | |
8049 | struct regcache *regs, | |
8050 | struct displaced_step_closure *dsc) | |
8051 | { | |
8052 | unsigned int rt = bits (insn1, 8, 10); | |
8053 | unsigned int pc; | |
8054 | int imm8 = (bits (insn1, 0, 7) << 2); | |
8055 | CORE_ADDR from = dsc->insn_addr; | |
8056 | ||
8057 | /* LDR Rd, #imm8 | |
8058 | ||
8059 | Rwrite as: | |
8060 | ||
8061 | Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8; | |
8062 | ||
8063 | Insn: LDR R0, [R2, R3]; | |
8064 | Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */ | |
8065 | ||
8066 | if (debug_displaced) | |
8067 | fprintf_unfiltered (gdb_stdlog, | |
8068 | "displaced: copying thumb ldr r%d [pc #%d]\n" | |
8069 | , rt, imm8); | |
8070 | ||
8071 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
8072 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
8073 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
8074 | pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
8075 | /* The assembler calculates the required value of the offset from the | |
8076 | Align(PC,4) value of this instruction to the label. */ | |
8077 | pc = pc & 0xfffffffc; | |
8078 | ||
8079 | displaced_write_reg (regs, dsc, 2, pc, CANNOT_WRITE_PC); | |
8080 | displaced_write_reg (regs, dsc, 3, imm8, CANNOT_WRITE_PC); | |
8081 | ||
8082 | dsc->rd = rt; | |
8083 | dsc->u.ldst.xfersize = 4; | |
8084 | dsc->u.ldst.rn = 0; | |
8085 | dsc->u.ldst.immed = 0; | |
8086 | dsc->u.ldst.writeback = 0; | |
8087 | dsc->u.ldst.restore_r4 = 0; | |
8088 | ||
8089 | dsc->modinsn[0] = 0x58d0; /* ldr r0, [r2, r3]*/ | |
8090 | ||
8091 | dsc->cleanup = &cleanup_load; | |
8092 | ||
8093 | return 0; | |
8094 | } | |
8095 | ||
8096 | /* Copy Thumb cbnz/cbz insruction. */ | |
8097 | ||
8098 | static int | |
8099 | thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1, | |
8100 | struct regcache *regs, | |
8101 | struct displaced_step_closure *dsc) | |
8102 | { | |
8103 | int non_zero = bit (insn1, 11); | |
8104 | unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1); | |
8105 | CORE_ADDR from = dsc->insn_addr; | |
8106 | int rn = bits (insn1, 0, 2); | |
8107 | int rn_val = displaced_read_reg (regs, dsc, rn); | |
8108 | ||
8109 | dsc->u.branch.cond = (rn_val && non_zero) || (!rn_val && !non_zero); | |
8110 | /* CBNZ and CBZ do not affect the condition flags. If condition is true, | |
8111 | set it INST_AL, so cleanup_branch will know branch is taken, otherwise, | |
8112 | condition is false, let it be, cleanup_branch will do nothing. */ | |
8113 | if (dsc->u.branch.cond) | |
8114 | { | |
8115 | dsc->u.branch.cond = INST_AL; | |
8116 | dsc->u.branch.dest = from + 4 + imm5; | |
8117 | } | |
8118 | else | |
8119 | dsc->u.branch.dest = from + 2; | |
8120 | ||
8121 | dsc->u.branch.link = 0; | |
8122 | dsc->u.branch.exchange = 0; | |
8123 | ||
8124 | if (debug_displaced) | |
8125 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s [r%d = 0x%x]" | |
8126 | " insn %.4x to %.8lx\n", non_zero ? "cbnz" : "cbz", | |
8127 | rn, rn_val, insn1, dsc->u.branch.dest); | |
8128 | ||
8129 | dsc->modinsn[0] = THUMB_NOP; | |
8130 | ||
8131 | dsc->cleanup = &cleanup_branch; | |
8132 | return 0; | |
8133 | } | |
8134 | ||
8135 | /* Copy Table Branch Byte/Halfword */ | |
8136 | static int | |
8137 | thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1, | |
8138 | uint16_t insn2, struct regcache *regs, | |
8139 | struct displaced_step_closure *dsc) | |
8140 | { | |
8141 | ULONGEST rn_val, rm_val; | |
8142 | int is_tbh = bit (insn2, 4); | |
8143 | CORE_ADDR halfwords = 0; | |
8144 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8145 | ||
8146 | rn_val = displaced_read_reg (regs, dsc, bits (insn1, 0, 3)); | |
8147 | rm_val = displaced_read_reg (regs, dsc, bits (insn2, 0, 3)); | |
8148 | ||
8149 | if (is_tbh) | |
8150 | { | |
8151 | gdb_byte buf[2]; | |
8152 | ||
8153 | target_read_memory (rn_val + 2 * rm_val, buf, 2); | |
8154 | halfwords = extract_unsigned_integer (buf, 2, byte_order); | |
8155 | } | |
8156 | else | |
8157 | { | |
8158 | gdb_byte buf[1]; | |
8159 | ||
8160 | target_read_memory (rn_val + rm_val, buf, 1); | |
8161 | halfwords = extract_unsigned_integer (buf, 1, byte_order); | |
8162 | } | |
8163 | ||
8164 | if (debug_displaced) | |
8165 | fprintf_unfiltered (gdb_stdlog, "displaced: %s base 0x%x offset 0x%x" | |
8166 | " offset 0x%x\n", is_tbh ? "tbh" : "tbb", | |
8167 | (unsigned int) rn_val, (unsigned int) rm_val, | |
8168 | (unsigned int) halfwords); | |
8169 | ||
8170 | dsc->u.branch.cond = INST_AL; | |
8171 | dsc->u.branch.link = 0; | |
8172 | dsc->u.branch.exchange = 0; | |
8173 | dsc->u.branch.dest = dsc->insn_addr + 4 + 2 * halfwords; | |
8174 | ||
8175 | dsc->cleanup = &cleanup_branch; | |
8176 | ||
8177 | return 0; | |
8178 | } | |
8179 | ||
8180 | static void | |
8181 | cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs, | |
8182 | struct displaced_step_closure *dsc) | |
8183 | { | |
8184 | /* PC <- r7 */ | |
8185 | int val = displaced_read_reg (regs, dsc, 7); | |
8186 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, val, BX_WRITE_PC); | |
8187 | ||
8188 | /* r7 <- r8 */ | |
8189 | val = displaced_read_reg (regs, dsc, 8); | |
8190 | displaced_write_reg (regs, dsc, 7, val, CANNOT_WRITE_PC); | |
8191 | ||
8192 | /* r8 <- tmp[0] */ | |
8193 | displaced_write_reg (regs, dsc, 8, dsc->tmp[0], CANNOT_WRITE_PC); | |
8194 | ||
8195 | } | |
8196 | ||
8197 | static int | |
8198 | thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, unsigned short insn1, | |
8199 | struct regcache *regs, | |
8200 | struct displaced_step_closure *dsc) | |
8201 | { | |
8202 | dsc->u.block.regmask = insn1 & 0x00ff; | |
8203 | ||
8204 | /* Rewrite instruction: POP {rX, rY, ...,rZ, PC} | |
8205 | to : | |
8206 | ||
8207 | (1) register list is full, that is, r0-r7 are used. | |
8208 | Prepare: tmp[0] <- r8 | |
8209 | ||
8210 | POP {r0, r1, ...., r6, r7}; remove PC from reglist | |
8211 | MOV r8, r7; Move value of r7 to r8; | |
8212 | POP {r7}; Store PC value into r7. | |
8213 | ||
8214 | Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0] | |
8215 | ||
8216 | (2) register list is not full, supposing there are N registers in | |
8217 | register list (except PC, 0 <= N <= 7). | |
8218 | Prepare: for each i, 0 - N, tmp[i] <- ri. | |
8219 | ||
8220 | POP {r0, r1, ...., rN}; | |
8221 | ||
8222 | Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN | |
8223 | from tmp[] properly. | |
8224 | */ | |
8225 | if (debug_displaced) | |
8226 | fprintf_unfiltered (gdb_stdlog, | |
8227 | "displaced: copying thumb pop {%.8x, pc} insn %.4x\n", | |
8228 | dsc->u.block.regmask, insn1); | |
8229 | ||
8230 | if (dsc->u.block.regmask == 0xff) | |
8231 | { | |
8232 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 8); | |
8233 | ||
8234 | dsc->modinsn[0] = (insn1 & 0xfeff); /* POP {r0,r1,...,r6, r7} */ | |
8235 | dsc->modinsn[1] = 0x46b8; /* MOV r8, r7 */ | |
8236 | dsc->modinsn[2] = 0xbc80; /* POP {r7} */ | |
8237 | ||
8238 | dsc->numinsns = 3; | |
8239 | dsc->cleanup = &cleanup_pop_pc_16bit_all; | |
8240 | } | |
8241 | else | |
8242 | { | |
8243 | unsigned int num_in_list = bitcount (dsc->u.block.regmask); | |
8244 | unsigned int new_regmask, bit = 1; | |
8245 | unsigned int to = 0, from = 0, i, new_rn; | |
8246 | ||
8247 | for (i = 0; i < num_in_list + 1; i++) | |
8248 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
8249 | ||
8250 | new_regmask = (1 << (num_in_list + 1)) - 1; | |
8251 | ||
8252 | if (debug_displaced) | |
8253 | fprintf_unfiltered (gdb_stdlog, _("displaced: POP " | |
8254 | "{..., pc}: original reg list %.4x," | |
8255 | " modified list %.4x\n"), | |
8256 | (int) dsc->u.block.regmask, new_regmask); | |
8257 | ||
8258 | dsc->u.block.regmask |= 0x8000; | |
8259 | dsc->u.block.writeback = 0; | |
8260 | dsc->u.block.cond = INST_AL; | |
8261 | ||
8262 | dsc->modinsn[0] = (insn1 & ~0x1ff) | (new_regmask & 0xff); | |
8263 | ||
8264 | dsc->cleanup = &cleanup_block_load_pc; | |
8265 | } | |
8266 | ||
8267 | return 0; | |
8268 | } | |
8269 | ||
8270 | static void | |
8271 | thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
8272 | struct regcache *regs, | |
8273 | struct displaced_step_closure *dsc) | |
8274 | { | |
8275 | unsigned short op_bit_12_15 = bits (insn1, 12, 15); | |
8276 | unsigned short op_bit_10_11 = bits (insn1, 10, 11); | |
8277 | int err = 0; | |
8278 | ||
8279 | /* 16-bit thumb instructions. */ | |
8280 | switch (op_bit_12_15) | |
8281 | { | |
8282 | /* Shift (imme), add, subtract, move and compare. */ | |
8283 | case 0: case 1: case 2: case 3: | |
8284 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
8285 | "shift/add/sub/mov/cmp", | |
8286 | dsc); | |
8287 | break; | |
8288 | case 4: | |
8289 | switch (op_bit_10_11) | |
8290 | { | |
8291 | case 0: /* Data-processing */ | |
8292 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
8293 | "data-processing", | |
8294 | dsc); | |
8295 | break; | |
8296 | case 1: /* Special data instructions and branch and exchange. */ | |
8297 | { | |
8298 | unsigned short op = bits (insn1, 7, 9); | |
8299 | if (op == 6 || op == 7) /* BX or BLX */ | |
8300 | err = thumb_copy_bx_blx_reg (gdbarch, insn1, regs, dsc); | |
8301 | else if (bits (insn1, 6, 7) != 0) /* ADD/MOV/CMP high registers. */ | |
8302 | err = thumb_copy_alu_reg (gdbarch, insn1, regs, dsc); | |
8303 | else | |
8304 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "special data", | |
8305 | dsc); | |
8306 | } | |
8307 | break; | |
8308 | default: /* LDR (literal) */ | |
8309 | err = thumb_copy_16bit_ldr_literal (gdbarch, insn1, regs, dsc); | |
8310 | } | |
8311 | break; | |
8312 | case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */ | |
8313 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldr/str", dsc); | |
8314 | break; | |
8315 | case 10: | |
8316 | if (op_bit_10_11 < 2) /* Generate PC-relative address */ | |
8317 | err = thumb_decode_pc_relative_16bit (gdbarch, insn1, regs, dsc); | |
8318 | else /* Generate SP-relative address */ | |
8319 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "sp-relative", dsc); | |
8320 | break; | |
8321 | case 11: /* Misc 16-bit instructions */ | |
8322 | { | |
8323 | switch (bits (insn1, 8, 11)) | |
8324 | { | |
8325 | case 1: case 3: case 9: case 11: /* CBNZ, CBZ */ | |
8326 | err = thumb_copy_cbnz_cbz (gdbarch, insn1, regs, dsc); | |
8327 | break; | |
8328 | case 12: case 13: /* POP */ | |
8329 | if (bit (insn1, 8)) /* PC is in register list. */ | |
8330 | err = thumb_copy_pop_pc_16bit (gdbarch, insn1, regs, dsc); | |
8331 | else | |
8332 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "pop", dsc); | |
8333 | break; | |
8334 | case 15: /* If-Then, and hints */ | |
8335 | if (bits (insn1, 0, 3)) | |
8336 | /* If-Then makes up to four following instructions conditional. | |
8337 | IT instruction itself is not conditional, so handle it as a | |
8338 | common unmodified instruction. */ | |
8339 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "If-Then", | |
8340 | dsc); | |
8341 | else | |
8342 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "hints", dsc); | |
8343 | break; | |
8344 | default: | |
8345 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "misc", dsc); | |
8346 | } | |
8347 | } | |
8348 | break; | |
8349 | case 12: | |
8350 | if (op_bit_10_11 < 2) /* Store multiple registers */ | |
8351 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "stm", dsc); | |
8352 | else /* Load multiple registers */ | |
8353 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldm", dsc); | |
8354 | break; | |
8355 | case 13: /* Conditional branch and supervisor call */ | |
8356 | if (bits (insn1, 9, 11) != 7) /* conditional branch */ | |
8357 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
8358 | else | |
8359 | err = thumb_copy_svc (gdbarch, insn1, regs, dsc); | |
8360 | break; | |
8361 | case 14: /* Unconditional branch */ | |
8362 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
8363 | break; | |
8364 | default: | |
8365 | err = 1; | |
8366 | } | |
8367 | ||
8368 | if (err) | |
8369 | internal_error (__FILE__, __LINE__, | |
8370 | _("thumb_process_displaced_16bit_insn: Instruction decode error")); | |
8371 | } | |
8372 | ||
8373 | static int | |
8374 | decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch, | |
8375 | uint16_t insn1, uint16_t insn2, | |
8376 | struct regcache *regs, | |
8377 | struct displaced_step_closure *dsc) | |
8378 | { | |
8379 | int rt = bits (insn2, 12, 15); | |
8380 | int rn = bits (insn1, 0, 3); | |
8381 | int op1 = bits (insn1, 7, 8); | |
8382 | int err = 0; | |
8383 | ||
8384 | switch (bits (insn1, 5, 6)) | |
8385 | { | |
8386 | case 0: /* Load byte and memory hints */ | |
8387 | if (rt == 0xf) /* PLD/PLI */ | |
8388 | { | |
8389 | if (rn == 0xf) | |
8390 | /* PLD literal or Encoding T3 of PLI(immediate, literal). */ | |
8391 | return thumb2_copy_preload (gdbarch, insn1, insn2, regs, dsc); | |
8392 | else | |
8393 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8394 | "pli/pld", dsc); | |
8395 | } | |
8396 | else | |
8397 | { | |
8398 | if (rn == 0xf) /* LDRB/LDRSB (literal) */ | |
8399 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
8400 | 1); | |
8401 | else | |
8402 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8403 | "ldrb{reg, immediate}/ldrbt", | |
8404 | dsc); | |
8405 | } | |
8406 | ||
8407 | break; | |
8408 | case 1: /* Load halfword and memory hints. */ | |
8409 | if (rt == 0xf) /* PLD{W} and Unalloc memory hint. */ | |
8410 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8411 | "pld/unalloc memhint", dsc); | |
8412 | else | |
8413 | { | |
8414 | if (rn == 0xf) | |
8415 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
8416 | 2); | |
8417 | else | |
8418 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8419 | "ldrh/ldrht", dsc); | |
8420 | } | |
8421 | break; | |
8422 | case 2: /* Load word */ | |
8423 | { | |
8424 | int insn2_bit_8_11 = bits (insn2, 8, 11); | |
8425 | ||
8426 | if (rn == 0xf) | |
8427 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, 4); | |
8428 | else if (op1 == 0x1) /* Encoding T3 */ | |
8429 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, dsc, | |
8430 | 0, 1); | |
8431 | else /* op1 == 0x0 */ | |
8432 | { | |
8433 | if (insn2_bit_8_11 == 0xc || (insn2_bit_8_11 & 0x9) == 0x9) | |
8434 | /* LDR (immediate) */ | |
8435 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
8436 | dsc, bit (insn2, 8), 1); | |
8437 | else if (insn2_bit_8_11 == 0xe) /* LDRT */ | |
8438 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8439 | "ldrt", dsc); | |
8440 | else | |
8441 | /* LDR (register) */ | |
8442 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
8443 | dsc, 0, 0); | |
8444 | } | |
8445 | break; | |
8446 | } | |
8447 | default: | |
8448 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
8449 | break; | |
8450 | } | |
8451 | return 0; | |
8452 | } | |
8453 | ||
8454 | static void | |
8455 | thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
8456 | uint16_t insn2, struct regcache *regs, | |
8457 | struct displaced_step_closure *dsc) | |
8458 | { | |
8459 | int err = 0; | |
8460 | unsigned short op = bit (insn2, 15); | |
8461 | unsigned int op1 = bits (insn1, 11, 12); | |
8462 | ||
8463 | switch (op1) | |
8464 | { | |
8465 | case 1: | |
8466 | { | |
8467 | switch (bits (insn1, 9, 10)) | |
8468 | { | |
8469 | case 0: | |
8470 | if (bit (insn1, 6)) | |
8471 | { | |
8472 | /* Load/store {dual, execlusive}, table branch. */ | |
8473 | if (bits (insn1, 7, 8) == 1 && bits (insn1, 4, 5) == 1 | |
8474 | && bits (insn2, 5, 7) == 0) | |
8475 | err = thumb2_copy_table_branch (gdbarch, insn1, insn2, regs, | |
8476 | dsc); | |
8477 | else | |
8478 | /* PC is not allowed to use in load/store {dual, exclusive} | |
8479 | instructions. */ | |
8480 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8481 | "load/store dual/ex", dsc); | |
8482 | } | |
8483 | else /* load/store multiple */ | |
8484 | { | |
8485 | switch (bits (insn1, 7, 8)) | |
8486 | { | |
8487 | case 0: case 3: /* SRS, RFE */ | |
8488 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8489 | "srs/rfe", dsc); | |
8490 | break; | |
8491 | case 1: case 2: /* LDM/STM/PUSH/POP */ | |
8492 | err = thumb2_copy_block_xfer (gdbarch, insn1, insn2, regs, dsc); | |
8493 | break; | |
8494 | } | |
8495 | } | |
8496 | break; | |
8497 | ||
8498 | case 1: | |
8499 | /* Data-processing (shift register). */ | |
8500 | err = thumb2_decode_dp_shift_reg (gdbarch, insn1, insn2, regs, | |
8501 | dsc); | |
8502 | break; | |
8503 | default: /* Coprocessor instructions. */ | |
8504 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
8505 | break; | |
8506 | } | |
8507 | break; | |
8508 | } | |
8509 | case 2: /* op1 = 2 */ | |
8510 | if (op) /* Branch and misc control. */ | |
8511 | { | |
8512 | if (bit (insn2, 14) /* BLX/BL */ | |
8513 | || bit (insn2, 12) /* Unconditional branch */ | |
8514 | || (bits (insn1, 7, 9) != 0x7)) /* Conditional branch */ | |
8515 | err = thumb2_copy_b_bl_blx (gdbarch, insn1, insn2, regs, dsc); | |
8516 | else | |
8517 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8518 | "misc ctrl", dsc); | |
8519 | } | |
8520 | else | |
8521 | { | |
8522 | if (bit (insn1, 9)) /* Data processing (plain binary imm). */ | |
8523 | { | |
8524 | int op = bits (insn1, 4, 8); | |
8525 | int rn = bits (insn1, 0, 3); | |
8526 | if ((op == 0 || op == 0xa) && rn == 0xf) | |
8527 | err = thumb_copy_pc_relative_32bit (gdbarch, insn1, insn2, | |
8528 | regs, dsc); | |
8529 | else | |
8530 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8531 | "dp/pb", dsc); | |
8532 | } | |
8533 | else /* Data processing (modified immeidate) */ | |
8534 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8535 | "dp/mi", dsc); | |
8536 | } | |
8537 | break; | |
8538 | case 3: /* op1 = 3 */ | |
8539 | switch (bits (insn1, 9, 10)) | |
8540 | { | |
8541 | case 0: | |
8542 | if (bit (insn1, 4)) | |
8543 | err = decode_thumb_32bit_ld_mem_hints (gdbarch, insn1, insn2, | |
8544 | regs, dsc); | |
8545 | else /* NEON Load/Store and Store single data item */ | |
8546 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8547 | "neon elt/struct load/store", | |
8548 | dsc); | |
8549 | break; | |
8550 | case 1: /* op1 = 3, bits (9, 10) == 1 */ | |
8551 | switch (bits (insn1, 7, 8)) | |
8552 | { | |
8553 | case 0: case 1: /* Data processing (register) */ | |
8554 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8555 | "dp(reg)", dsc); | |
8556 | break; | |
8557 | case 2: /* Multiply and absolute difference */ | |
8558 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8559 | "mul/mua/diff", dsc); | |
8560 | break; | |
8561 | case 3: /* Long multiply and divide */ | |
8562 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8563 | "lmul/lmua", dsc); | |
8564 | break; | |
8565 | } | |
8566 | break; | |
8567 | default: /* Coprocessor instructions */ | |
8568 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
8569 | break; | |
8570 | } | |
8571 | break; | |
8572 | default: | |
8573 | err = 1; | |
8574 | } | |
8575 | ||
8576 | if (err) | |
8577 | internal_error (__FILE__, __LINE__, | |
8578 | _("thumb_process_displaced_32bit_insn: Instruction decode error")); | |
8579 | ||
8580 | } | |
8581 | ||
b434a28f YQ |
8582 | static void |
8583 | thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, | |
8584 | CORE_ADDR to, struct regcache *regs, | |
8585 | struct displaced_step_closure *dsc) | |
8586 | { | |
34518530 YQ |
8587 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
8588 | uint16_t insn1 | |
8589 | = read_memory_unsigned_integer (from, 2, byte_order_for_code); | |
8590 | ||
8591 | if (debug_displaced) | |
8592 | fprintf_unfiltered (gdb_stdlog, "displaced: process thumb insn %.4x " | |
8593 | "at %.8lx\n", insn1, (unsigned long) from); | |
8594 | ||
8595 | dsc->is_thumb = 1; | |
8596 | dsc->insn_size = thumb_insn_size (insn1); | |
8597 | if (thumb_insn_size (insn1) == 4) | |
8598 | { | |
8599 | uint16_t insn2 | |
8600 | = read_memory_unsigned_integer (from + 2, 2, byte_order_for_code); | |
8601 | thumb_process_displaced_32bit_insn (gdbarch, insn1, insn2, regs, dsc); | |
8602 | } | |
8603 | else | |
8604 | thumb_process_displaced_16bit_insn (gdbarch, insn1, regs, dsc); | |
b434a28f YQ |
8605 | } |
8606 | ||
cca44b1b | 8607 | void |
b434a28f YQ |
8608 | arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
8609 | CORE_ADDR to, struct regcache *regs, | |
cca44b1b JB |
8610 | struct displaced_step_closure *dsc) |
8611 | { | |
8612 | int err = 0; | |
b434a28f YQ |
8613 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
8614 | uint32_t insn; | |
cca44b1b JB |
8615 | |
8616 | /* Most displaced instructions use a 1-instruction scratch space, so set this | |
8617 | here and override below if/when necessary. */ | |
8618 | dsc->numinsns = 1; | |
8619 | dsc->insn_addr = from; | |
8620 | dsc->scratch_base = to; | |
8621 | dsc->cleanup = NULL; | |
8622 | dsc->wrote_to_pc = 0; | |
8623 | ||
b434a28f YQ |
8624 | if (!displaced_in_arm_mode (regs)) |
8625 | return thumb_process_displaced_insn (gdbarch, from, to, regs, dsc); | |
8626 | ||
4db71c0b YQ |
8627 | dsc->is_thumb = 0; |
8628 | dsc->insn_size = 4; | |
b434a28f YQ |
8629 | insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); |
8630 | if (debug_displaced) | |
8631 | fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx " | |
8632 | "at %.8lx\n", (unsigned long) insn, | |
8633 | (unsigned long) from); | |
8634 | ||
cca44b1b | 8635 | if ((insn & 0xf0000000) == 0xf0000000) |
7ff120b4 | 8636 | err = arm_decode_unconditional (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8637 | else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24)) |
8638 | { | |
8639 | case 0x0: case 0x1: case 0x2: case 0x3: | |
7ff120b4 | 8640 | err = arm_decode_dp_misc (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8641 | break; |
8642 | ||
8643 | case 0x4: case 0x5: case 0x6: | |
7ff120b4 | 8644 | err = arm_decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8645 | break; |
8646 | ||
8647 | case 0x7: | |
7ff120b4 | 8648 | err = arm_decode_media (gdbarch, insn, dsc); |
cca44b1b JB |
8649 | break; |
8650 | ||
8651 | case 0x8: case 0x9: case 0xa: case 0xb: | |
7ff120b4 | 8652 | err = arm_decode_b_bl_ldmstm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8653 | break; |
8654 | ||
8655 | case 0xc: case 0xd: case 0xe: case 0xf: | |
7ff120b4 | 8656 | err = arm_decode_svc_copro (gdbarch, insn, to, regs, dsc); |
cca44b1b JB |
8657 | break; |
8658 | } | |
8659 | ||
8660 | if (err) | |
8661 | internal_error (__FILE__, __LINE__, | |
8662 | _("arm_process_displaced_insn: Instruction decode error")); | |
8663 | } | |
8664 | ||
8665 | /* Actually set up the scratch space for a displaced instruction. */ | |
8666 | ||
8667 | void | |
8668 | arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from, | |
8669 | CORE_ADDR to, struct displaced_step_closure *dsc) | |
8670 | { | |
8671 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4db71c0b | 8672 | unsigned int i, len, offset; |
cca44b1b | 8673 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
4db71c0b | 8674 | int size = dsc->is_thumb? 2 : 4; |
948f8e3d | 8675 | const gdb_byte *bkp_insn; |
cca44b1b | 8676 | |
4db71c0b | 8677 | offset = 0; |
cca44b1b JB |
8678 | /* Poke modified instruction(s). */ |
8679 | for (i = 0; i < dsc->numinsns; i++) | |
8680 | { | |
8681 | if (debug_displaced) | |
4db71c0b YQ |
8682 | { |
8683 | fprintf_unfiltered (gdb_stdlog, "displaced: writing insn "); | |
8684 | if (size == 4) | |
8685 | fprintf_unfiltered (gdb_stdlog, "%.8lx", | |
8686 | dsc->modinsn[i]); | |
8687 | else if (size == 2) | |
8688 | fprintf_unfiltered (gdb_stdlog, "%.4x", | |
8689 | (unsigned short)dsc->modinsn[i]); | |
8690 | ||
8691 | fprintf_unfiltered (gdb_stdlog, " at %.8lx\n", | |
8692 | (unsigned long) to + offset); | |
8693 | ||
8694 | } | |
8695 | write_memory_unsigned_integer (to + offset, size, | |
8696 | byte_order_for_code, | |
cca44b1b | 8697 | dsc->modinsn[i]); |
4db71c0b YQ |
8698 | offset += size; |
8699 | } | |
8700 | ||
8701 | /* Choose the correct breakpoint instruction. */ | |
8702 | if (dsc->is_thumb) | |
8703 | { | |
8704 | bkp_insn = tdep->thumb_breakpoint; | |
8705 | len = tdep->thumb_breakpoint_size; | |
8706 | } | |
8707 | else | |
8708 | { | |
8709 | bkp_insn = tdep->arm_breakpoint; | |
8710 | len = tdep->arm_breakpoint_size; | |
cca44b1b JB |
8711 | } |
8712 | ||
8713 | /* Put breakpoint afterwards. */ | |
4db71c0b | 8714 | write_memory (to + offset, bkp_insn, len); |
cca44b1b JB |
8715 | |
8716 | if (debug_displaced) | |
8717 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", | |
8718 | paddress (gdbarch, from), paddress (gdbarch, to)); | |
8719 | } | |
8720 | ||
8721 | /* Entry point for copying an instruction into scratch space for displaced | |
8722 | stepping. */ | |
8723 | ||
8724 | struct displaced_step_closure * | |
8725 | arm_displaced_step_copy_insn (struct gdbarch *gdbarch, | |
8726 | CORE_ADDR from, CORE_ADDR to, | |
8727 | struct regcache *regs) | |
8728 | { | |
8729 | struct displaced_step_closure *dsc | |
8730 | = xmalloc (sizeof (struct displaced_step_closure)); | |
b434a28f | 8731 | arm_process_displaced_insn (gdbarch, from, to, regs, dsc); |
cca44b1b JB |
8732 | arm_displaced_init_closure (gdbarch, from, to, dsc); |
8733 | ||
8734 | return dsc; | |
8735 | } | |
8736 | ||
8737 | /* Entry point for cleaning things up after a displaced instruction has been | |
8738 | single-stepped. */ | |
8739 | ||
8740 | void | |
8741 | arm_displaced_step_fixup (struct gdbarch *gdbarch, | |
8742 | struct displaced_step_closure *dsc, | |
8743 | CORE_ADDR from, CORE_ADDR to, | |
8744 | struct regcache *regs) | |
8745 | { | |
8746 | if (dsc->cleanup) | |
8747 | dsc->cleanup (gdbarch, regs, dsc); | |
8748 | ||
8749 | if (!dsc->wrote_to_pc) | |
4db71c0b YQ |
8750 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
8751 | dsc->insn_addr + dsc->insn_size); | |
8752 | ||
cca44b1b JB |
8753 | } |
8754 | ||
8755 | #include "bfd-in2.h" | |
8756 | #include "libcoff.h" | |
8757 | ||
8758 | static int | |
8759 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) | |
8760 | { | |
9779414d DJ |
8761 | struct gdbarch *gdbarch = info->application_data; |
8762 | ||
8763 | if (arm_pc_is_thumb (gdbarch, memaddr)) | |
cca44b1b JB |
8764 | { |
8765 | static asymbol *asym; | |
8766 | static combined_entry_type ce; | |
8767 | static struct coff_symbol_struct csym; | |
8768 | static struct bfd fake_bfd; | |
8769 | static bfd_target fake_target; | |
8770 | ||
8771 | if (csym.native == NULL) | |
8772 | { | |
8773 | /* Create a fake symbol vector containing a Thumb symbol. | |
8774 | This is solely so that the code in print_insn_little_arm() | |
8775 | and print_insn_big_arm() in opcodes/arm-dis.c will detect | |
8776 | the presence of a Thumb symbol and switch to decoding | |
8777 | Thumb instructions. */ | |
8778 | ||
8779 | fake_target.flavour = bfd_target_coff_flavour; | |
8780 | fake_bfd.xvec = &fake_target; | |
8781 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; | |
8782 | csym.native = &ce; | |
8783 | csym.symbol.the_bfd = &fake_bfd; | |
8784 | csym.symbol.name = "fake"; | |
8785 | asym = (asymbol *) & csym; | |
8786 | } | |
8787 | ||
8788 | memaddr = UNMAKE_THUMB_ADDR (memaddr); | |
8789 | info->symbols = &asym; | |
8790 | } | |
8791 | else | |
8792 | info->symbols = NULL; | |
8793 | ||
8794 | if (info->endian == BFD_ENDIAN_BIG) | |
8795 | return print_insn_big_arm (memaddr, info); | |
8796 | else | |
8797 | return print_insn_little_arm (memaddr, info); | |
8798 | } | |
8799 | ||
8800 | /* The following define instruction sequences that will cause ARM | |
8801 | cpu's to take an undefined instruction trap. These are used to | |
8802 | signal a breakpoint to GDB. | |
8803 | ||
8804 | The newer ARMv4T cpu's are capable of operating in ARM or Thumb | |
8805 | modes. A different instruction is required for each mode. The ARM | |
8806 | cpu's can also be big or little endian. Thus four different | |
8807 | instructions are needed to support all cases. | |
8808 | ||
8809 | Note: ARMv4 defines several new instructions that will take the | |
8810 | undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does | |
8811 | not in fact add the new instructions. The new undefined | |
8812 | instructions in ARMv4 are all instructions that had no defined | |
8813 | behaviour in earlier chips. There is no guarantee that they will | |
8814 | raise an exception, but may be treated as NOP's. In practice, it | |
8815 | may only safe to rely on instructions matching: | |
8816 | ||
8817 | 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
8818 | 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 | |
8819 | 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 | |
8820 | ||
0963b4bd | 8821 | Even this may only true if the condition predicate is true. The |
cca44b1b JB |
8822 | following use a condition predicate of ALWAYS so it is always TRUE. |
8823 | ||
8824 | There are other ways of forcing a breakpoint. GNU/Linux, RISC iX, | |
8825 | and NetBSD all use a software interrupt rather than an undefined | |
8826 | instruction to force a trap. This can be handled by by the | |
8827 | abi-specific code during establishment of the gdbarch vector. */ | |
8828 | ||
8829 | #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7} | |
8830 | #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE} | |
8831 | #define THUMB_LE_BREAKPOINT {0xbe,0xbe} | |
8832 | #define THUMB_BE_BREAKPOINT {0xbe,0xbe} | |
8833 | ||
948f8e3d PA |
8834 | static const gdb_byte arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT; |
8835 | static const gdb_byte arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT; | |
8836 | static const gdb_byte arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT; | |
8837 | static const gdb_byte arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT; | |
cca44b1b JB |
8838 | |
8839 | /* Determine the type and size of breakpoint to insert at PCPTR. Uses | |
8840 | the program counter value to determine whether a 16-bit or 32-bit | |
8841 | breakpoint should be used. It returns a pointer to a string of | |
8842 | bytes that encode a breakpoint instruction, stores the length of | |
8843 | the string to *lenptr, and adjusts the program counter (if | |
8844 | necessary) to point to the actual memory location where the | |
8845 | breakpoint should be inserted. */ | |
8846 | ||
8847 | static const unsigned char * | |
8848 | arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) | |
8849 | { | |
8850 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
177321bd | 8851 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
cca44b1b | 8852 | |
9779414d | 8853 | if (arm_pc_is_thumb (gdbarch, *pcptr)) |
cca44b1b JB |
8854 | { |
8855 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
177321bd DJ |
8856 | |
8857 | /* If we have a separate 32-bit breakpoint instruction for Thumb-2, | |
8858 | check whether we are replacing a 32-bit instruction. */ | |
8859 | if (tdep->thumb2_breakpoint != NULL) | |
8860 | { | |
8861 | gdb_byte buf[2]; | |
8862 | if (target_read_memory (*pcptr, buf, 2) == 0) | |
8863 | { | |
8864 | unsigned short inst1; | |
8865 | inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
db24da6d | 8866 | if (thumb_insn_size (inst1) == 4) |
177321bd DJ |
8867 | { |
8868 | *lenptr = tdep->thumb2_breakpoint_size; | |
8869 | return tdep->thumb2_breakpoint; | |
8870 | } | |
8871 | } | |
8872 | } | |
8873 | ||
cca44b1b JB |
8874 | *lenptr = tdep->thumb_breakpoint_size; |
8875 | return tdep->thumb_breakpoint; | |
8876 | } | |
8877 | else | |
8878 | { | |
8879 | *lenptr = tdep->arm_breakpoint_size; | |
8880 | return tdep->arm_breakpoint; | |
8881 | } | |
8882 | } | |
8883 | ||
177321bd DJ |
8884 | static void |
8885 | arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, | |
8886 | int *kindptr) | |
8887 | { | |
177321bd DJ |
8888 | arm_breakpoint_from_pc (gdbarch, pcptr, kindptr); |
8889 | ||
9779414d | 8890 | if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4) |
177321bd DJ |
8891 | /* The documented magic value for a 32-bit Thumb-2 breakpoint, so |
8892 | that this is not confused with a 32-bit ARM breakpoint. */ | |
8893 | *kindptr = 3; | |
8894 | } | |
8895 | ||
cca44b1b JB |
8896 | /* Extract from an array REGBUF containing the (raw) register state a |
8897 | function return value of type TYPE, and copy that, in virtual | |
8898 | format, into VALBUF. */ | |
8899 | ||
8900 | static void | |
8901 | arm_extract_return_value (struct type *type, struct regcache *regs, | |
8902 | gdb_byte *valbuf) | |
8903 | { | |
8904 | struct gdbarch *gdbarch = get_regcache_arch (regs); | |
8905 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8906 | ||
8907 | if (TYPE_CODE_FLT == TYPE_CODE (type)) | |
8908 | { | |
8909 | switch (gdbarch_tdep (gdbarch)->fp_model) | |
8910 | { | |
8911 | case ARM_FLOAT_FPA: | |
8912 | { | |
8913 | /* The value is in register F0 in internal format. We need to | |
8914 | extract the raw value and then convert it to the desired | |
8915 | internal type. */ | |
8916 | bfd_byte tmpbuf[FP_REGISTER_SIZE]; | |
8917 | ||
8918 | regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf); | |
8919 | convert_from_extended (floatformat_from_type (type), tmpbuf, | |
8920 | valbuf, gdbarch_byte_order (gdbarch)); | |
8921 | } | |
8922 | break; | |
8923 | ||
8924 | case ARM_FLOAT_SOFT_FPA: | |
8925 | case ARM_FLOAT_SOFT_VFP: | |
8926 | /* ARM_FLOAT_VFP can arise if this is a variadic function so | |
8927 | not using the VFP ABI code. */ | |
8928 | case ARM_FLOAT_VFP: | |
8929 | regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf); | |
8930 | if (TYPE_LENGTH (type) > 4) | |
8931 | regcache_cooked_read (regs, ARM_A1_REGNUM + 1, | |
8932 | valbuf + INT_REGISTER_SIZE); | |
8933 | break; | |
8934 | ||
8935 | default: | |
0963b4bd MS |
8936 | internal_error (__FILE__, __LINE__, |
8937 | _("arm_extract_return_value: " | |
8938 | "Floating point model not supported")); | |
cca44b1b JB |
8939 | break; |
8940 | } | |
8941 | } | |
8942 | else if (TYPE_CODE (type) == TYPE_CODE_INT | |
8943 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
8944 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
8945 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
8946 | || TYPE_CODE (type) == TYPE_CODE_REF | |
8947 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
8948 | { | |
b021a221 MS |
8949 | /* If the type is a plain integer, then the access is |
8950 | straight-forward. Otherwise we have to play around a bit | |
8951 | more. */ | |
cca44b1b JB |
8952 | int len = TYPE_LENGTH (type); |
8953 | int regno = ARM_A1_REGNUM; | |
8954 | ULONGEST tmp; | |
8955 | ||
8956 | while (len > 0) | |
8957 | { | |
8958 | /* By using store_unsigned_integer we avoid having to do | |
8959 | anything special for small big-endian values. */ | |
8960 | regcache_cooked_read_unsigned (regs, regno++, &tmp); | |
8961 | store_unsigned_integer (valbuf, | |
8962 | (len > INT_REGISTER_SIZE | |
8963 | ? INT_REGISTER_SIZE : len), | |
8964 | byte_order, tmp); | |
8965 | len -= INT_REGISTER_SIZE; | |
8966 | valbuf += INT_REGISTER_SIZE; | |
8967 | } | |
8968 | } | |
8969 | else | |
8970 | { | |
8971 | /* For a structure or union the behaviour is as if the value had | |
8972 | been stored to word-aligned memory and then loaded into | |
8973 | registers with 32-bit load instruction(s). */ | |
8974 | int len = TYPE_LENGTH (type); | |
8975 | int regno = ARM_A1_REGNUM; | |
8976 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; | |
8977 | ||
8978 | while (len > 0) | |
8979 | { | |
8980 | regcache_cooked_read (regs, regno++, tmpbuf); | |
8981 | memcpy (valbuf, tmpbuf, | |
8982 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); | |
8983 | len -= INT_REGISTER_SIZE; | |
8984 | valbuf += INT_REGISTER_SIZE; | |
8985 | } | |
8986 | } | |
8987 | } | |
8988 | ||
8989 | ||
8990 | /* Will a function return an aggregate type in memory or in a | |
8991 | register? Return 0 if an aggregate type can be returned in a | |
8992 | register, 1 if it must be returned in memory. */ | |
8993 | ||
8994 | static int | |
8995 | arm_return_in_memory (struct gdbarch *gdbarch, struct type *type) | |
8996 | { | |
8997 | int nRc; | |
8998 | enum type_code code; | |
8999 | ||
9000 | CHECK_TYPEDEF (type); | |
9001 | ||
9002 | /* In the ARM ABI, "integer" like aggregate types are returned in | |
9003 | registers. For an aggregate type to be integer like, its size | |
9004 | must be less than or equal to INT_REGISTER_SIZE and the | |
9005 | offset of each addressable subfield must be zero. Note that bit | |
9006 | fields are not addressable, and all addressable subfields of | |
9007 | unions always start at offset zero. | |
9008 | ||
9009 | This function is based on the behaviour of GCC 2.95.1. | |
9010 | See: gcc/arm.c: arm_return_in_memory() for details. | |
9011 | ||
9012 | Note: All versions of GCC before GCC 2.95.2 do not set up the | |
9013 | parameters correctly for a function returning the following | |
9014 | structure: struct { float f;}; This should be returned in memory, | |
9015 | not a register. Richard Earnshaw sent me a patch, but I do not | |
9016 | know of any way to detect if a function like the above has been | |
9017 | compiled with the correct calling convention. */ | |
9018 | ||
9019 | /* All aggregate types that won't fit in a register must be returned | |
9020 | in memory. */ | |
9021 | if (TYPE_LENGTH (type) > INT_REGISTER_SIZE) | |
9022 | { | |
9023 | return 1; | |
9024 | } | |
9025 | ||
9026 | /* The AAPCS says all aggregates not larger than a word are returned | |
9027 | in a register. */ | |
9028 | if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS) | |
9029 | return 0; | |
9030 | ||
9031 | /* The only aggregate types that can be returned in a register are | |
9032 | structs and unions. Arrays must be returned in memory. */ | |
9033 | code = TYPE_CODE (type); | |
9034 | if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code)) | |
9035 | { | |
9036 | return 1; | |
9037 | } | |
9038 | ||
9039 | /* Assume all other aggregate types can be returned in a register. | |
9040 | Run a check for structures, unions and arrays. */ | |
9041 | nRc = 0; | |
9042 | ||
9043 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) | |
9044 | { | |
9045 | int i; | |
9046 | /* Need to check if this struct/union is "integer" like. For | |
9047 | this to be true, its size must be less than or equal to | |
9048 | INT_REGISTER_SIZE and the offset of each addressable | |
9049 | subfield must be zero. Note that bit fields are not | |
9050 | addressable, and unions always start at offset zero. If any | |
9051 | of the subfields is a floating point type, the struct/union | |
9052 | cannot be an integer type. */ | |
9053 | ||
9054 | /* For each field in the object, check: | |
9055 | 1) Is it FP? --> yes, nRc = 1; | |
67255d04 RE |
9056 | 2) Is it addressable (bitpos != 0) and |
9057 | not packed (bitsize == 0)? | |
9058 | --> yes, nRc = 1 | |
9059 | */ | |
9060 | ||
9061 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
9062 | { | |
9063 | enum type_code field_type_code; | |
0963b4bd MS |
9064 | field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, |
9065 | i))); | |
67255d04 RE |
9066 | |
9067 | /* Is it a floating point type field? */ | |
9068 | if (field_type_code == TYPE_CODE_FLT) | |
9069 | { | |
9070 | nRc = 1; | |
9071 | break; | |
9072 | } | |
9073 | ||
9074 | /* If bitpos != 0, then we have to care about it. */ | |
9075 | if (TYPE_FIELD_BITPOS (type, i) != 0) | |
9076 | { | |
9077 | /* Bitfields are not addressable. If the field bitsize is | |
9078 | zero, then the field is not packed. Hence it cannot be | |
9079 | a bitfield or any other packed type. */ | |
9080 | if (TYPE_FIELD_BITSIZE (type, i) == 0) | |
9081 | { | |
9082 | nRc = 1; | |
9083 | break; | |
9084 | } | |
9085 | } | |
9086 | } | |
9087 | } | |
9088 | ||
9089 | return nRc; | |
9090 | } | |
9091 | ||
34e8f22d RE |
9092 | /* Write into appropriate registers a function return value of type |
9093 | TYPE, given in virtual format. */ | |
9094 | ||
9095 | static void | |
b508a996 | 9096 | arm_store_return_value (struct type *type, struct regcache *regs, |
5238cf52 | 9097 | const gdb_byte *valbuf) |
34e8f22d | 9098 | { |
be8626e0 | 9099 | struct gdbarch *gdbarch = get_regcache_arch (regs); |
e17a4113 | 9100 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
be8626e0 | 9101 | |
34e8f22d RE |
9102 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
9103 | { | |
e362b510 | 9104 | gdb_byte buf[MAX_REGISTER_SIZE]; |
34e8f22d | 9105 | |
be8626e0 | 9106 | switch (gdbarch_tdep (gdbarch)->fp_model) |
08216dd7 RE |
9107 | { |
9108 | case ARM_FLOAT_FPA: | |
9109 | ||
be8626e0 MD |
9110 | convert_to_extended (floatformat_from_type (type), buf, valbuf, |
9111 | gdbarch_byte_order (gdbarch)); | |
b508a996 | 9112 | regcache_cooked_write (regs, ARM_F0_REGNUM, buf); |
08216dd7 RE |
9113 | break; |
9114 | ||
fd50bc42 | 9115 | case ARM_FLOAT_SOFT_FPA: |
08216dd7 | 9116 | case ARM_FLOAT_SOFT_VFP: |
90445bd3 DJ |
9117 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
9118 | not using the VFP ABI code. */ | |
9119 | case ARM_FLOAT_VFP: | |
b508a996 RE |
9120 | regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf); |
9121 | if (TYPE_LENGTH (type) > 4) | |
9122 | regcache_cooked_write (regs, ARM_A1_REGNUM + 1, | |
7a5ea0d4 | 9123 | valbuf + INT_REGISTER_SIZE); |
08216dd7 RE |
9124 | break; |
9125 | ||
9126 | default: | |
9b20d036 MS |
9127 | internal_error (__FILE__, __LINE__, |
9128 | _("arm_store_return_value: Floating " | |
9129 | "point model not supported")); | |
08216dd7 RE |
9130 | break; |
9131 | } | |
34e8f22d | 9132 | } |
b508a996 RE |
9133 | else if (TYPE_CODE (type) == TYPE_CODE_INT |
9134 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
9135 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
9136 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
9137 | || TYPE_CODE (type) == TYPE_CODE_REF | |
9138 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
9139 | { | |
9140 | if (TYPE_LENGTH (type) <= 4) | |
9141 | { | |
9142 | /* Values of one word or less are zero/sign-extended and | |
9143 | returned in r0. */ | |
7a5ea0d4 | 9144 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
9145 | LONGEST val = unpack_long (type, valbuf); |
9146 | ||
e17a4113 | 9147 | store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val); |
b508a996 RE |
9148 | regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf); |
9149 | } | |
9150 | else | |
9151 | { | |
9152 | /* Integral values greater than one word are stored in consecutive | |
9153 | registers starting with r0. This will always be a multiple of | |
9154 | the regiser size. */ | |
9155 | int len = TYPE_LENGTH (type); | |
9156 | int regno = ARM_A1_REGNUM; | |
9157 | ||
9158 | while (len > 0) | |
9159 | { | |
9160 | regcache_cooked_write (regs, regno++, valbuf); | |
7a5ea0d4 DJ |
9161 | len -= INT_REGISTER_SIZE; |
9162 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
9163 | } |
9164 | } | |
9165 | } | |
34e8f22d | 9166 | else |
b508a996 RE |
9167 | { |
9168 | /* For a structure or union the behaviour is as if the value had | |
9169 | been stored to word-aligned memory and then loaded into | |
9170 | registers with 32-bit load instruction(s). */ | |
9171 | int len = TYPE_LENGTH (type); | |
9172 | int regno = ARM_A1_REGNUM; | |
7a5ea0d4 | 9173 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
9174 | |
9175 | while (len > 0) | |
9176 | { | |
9177 | memcpy (tmpbuf, valbuf, | |
7a5ea0d4 | 9178 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); |
b508a996 | 9179 | regcache_cooked_write (regs, regno++, tmpbuf); |
7a5ea0d4 DJ |
9180 | len -= INT_REGISTER_SIZE; |
9181 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
9182 | } |
9183 | } | |
34e8f22d RE |
9184 | } |
9185 | ||
2af48f68 PB |
9186 | |
9187 | /* Handle function return values. */ | |
9188 | ||
9189 | static enum return_value_convention | |
6a3a010b | 9190 | arm_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
9191 | struct type *valtype, struct regcache *regcache, |
9192 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2af48f68 | 9193 | { |
7c00367c | 9194 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
6a3a010b | 9195 | struct type *func_type = function ? value_type (function) : NULL; |
90445bd3 DJ |
9196 | enum arm_vfp_cprc_base_type vfp_base_type; |
9197 | int vfp_base_count; | |
9198 | ||
9199 | if (arm_vfp_abi_for_function (gdbarch, func_type) | |
9200 | && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count)) | |
9201 | { | |
9202 | int reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
9203 | int unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
9204 | int i; | |
9205 | for (i = 0; i < vfp_base_count; i++) | |
9206 | { | |
58d6951d DJ |
9207 | if (reg_char == 'q') |
9208 | { | |
9209 | if (writebuf) | |
9210 | arm_neon_quad_write (gdbarch, regcache, i, | |
9211 | writebuf + i * unit_length); | |
9212 | ||
9213 | if (readbuf) | |
9214 | arm_neon_quad_read (gdbarch, regcache, i, | |
9215 | readbuf + i * unit_length); | |
9216 | } | |
9217 | else | |
9218 | { | |
9219 | char name_buf[4]; | |
9220 | int regnum; | |
9221 | ||
8c042590 | 9222 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", reg_char, i); |
58d6951d DJ |
9223 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9224 | strlen (name_buf)); | |
9225 | if (writebuf) | |
9226 | regcache_cooked_write (regcache, regnum, | |
9227 | writebuf + i * unit_length); | |
9228 | if (readbuf) | |
9229 | regcache_cooked_read (regcache, regnum, | |
9230 | readbuf + i * unit_length); | |
9231 | } | |
90445bd3 DJ |
9232 | } |
9233 | return RETURN_VALUE_REGISTER_CONVENTION; | |
9234 | } | |
7c00367c | 9235 | |
2af48f68 PB |
9236 | if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
9237 | || TYPE_CODE (valtype) == TYPE_CODE_UNION | |
9238 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
9239 | { | |
7c00367c MK |
9240 | if (tdep->struct_return == pcc_struct_return |
9241 | || arm_return_in_memory (gdbarch, valtype)) | |
2af48f68 PB |
9242 | return RETURN_VALUE_STRUCT_CONVENTION; |
9243 | } | |
9244 | ||
7052e42c UW |
9245 | /* AAPCS returns complex types longer than a register in memory. */ |
9246 | if (tdep->arm_abi != ARM_ABI_APCS | |
9247 | && TYPE_CODE (valtype) == TYPE_CODE_COMPLEX | |
9248 | && TYPE_LENGTH (valtype) > INT_REGISTER_SIZE) | |
9249 | return RETURN_VALUE_STRUCT_CONVENTION; | |
9250 | ||
2af48f68 PB |
9251 | if (writebuf) |
9252 | arm_store_return_value (valtype, regcache, writebuf); | |
9253 | ||
9254 | if (readbuf) | |
9255 | arm_extract_return_value (valtype, regcache, readbuf); | |
9256 | ||
9257 | return RETURN_VALUE_REGISTER_CONVENTION; | |
9258 | } | |
9259 | ||
9260 | ||
9df628e0 | 9261 | static int |
60ade65d | 9262 | arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
9df628e0 | 9263 | { |
e17a4113 UW |
9264 | struct gdbarch *gdbarch = get_frame_arch (frame); |
9265 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
9266 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
9df628e0 | 9267 | CORE_ADDR jb_addr; |
e362b510 | 9268 | gdb_byte buf[INT_REGISTER_SIZE]; |
9df628e0 | 9269 | |
60ade65d | 9270 | jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM); |
9df628e0 RE |
9271 | |
9272 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, | |
7a5ea0d4 | 9273 | INT_REGISTER_SIZE)) |
9df628e0 RE |
9274 | return 0; |
9275 | ||
e17a4113 | 9276 | *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order); |
9df628e0 RE |
9277 | return 1; |
9278 | } | |
9279 | ||
faa95490 DJ |
9280 | /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, |
9281 | return the target PC. Otherwise return 0. */ | |
c906108c SS |
9282 | |
9283 | CORE_ADDR | |
52f729a7 | 9284 | arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 9285 | { |
2c02bd72 | 9286 | const char *name; |
faa95490 | 9287 | int namelen; |
c906108c SS |
9288 | CORE_ADDR start_addr; |
9289 | ||
9290 | /* Find the starting address and name of the function containing the PC. */ | |
9291 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) | |
80d8d390 YQ |
9292 | { |
9293 | /* Trampoline 'bx reg' doesn't belong to any functions. Do the | |
9294 | check here. */ | |
9295 | start_addr = arm_skip_bx_reg (frame, pc); | |
9296 | if (start_addr != 0) | |
9297 | return start_addr; | |
9298 | ||
9299 | return 0; | |
9300 | } | |
c906108c | 9301 | |
faa95490 DJ |
9302 | /* If PC is in a Thumb call or return stub, return the address of the |
9303 | target PC, which is in a register. The thunk functions are called | |
9304 | _call_via_xx, where x is the register name. The possible names | |
3d8d5e79 DJ |
9305 | are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar |
9306 | functions, named __ARM_call_via_r[0-7]. */ | |
9307 | if (strncmp (name, "_call_via_", 10) == 0 | |
9308 | || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0) | |
c906108c | 9309 | { |
ed9a39eb JM |
9310 | /* Use the name suffix to determine which register contains the |
9311 | target PC. */ | |
c5aa993b JM |
9312 | static char *table[15] = |
9313 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
9314 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" | |
9315 | }; | |
c906108c | 9316 | int regno; |
faa95490 | 9317 | int offset = strlen (name) - 2; |
c906108c SS |
9318 | |
9319 | for (regno = 0; regno <= 14; regno++) | |
faa95490 | 9320 | if (strcmp (&name[offset], table[regno]) == 0) |
52f729a7 | 9321 | return get_frame_register_unsigned (frame, regno); |
c906108c | 9322 | } |
ed9a39eb | 9323 | |
faa95490 DJ |
9324 | /* GNU ld generates __foo_from_arm or __foo_from_thumb for |
9325 | non-interworking calls to foo. We could decode the stubs | |
9326 | to find the target but it's easier to use the symbol table. */ | |
9327 | namelen = strlen (name); | |
9328 | if (name[0] == '_' && name[1] == '_' | |
9329 | && ((namelen > 2 + strlen ("_from_thumb") | |
9330 | && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb", | |
9331 | strlen ("_from_thumb")) == 0) | |
9332 | || (namelen > 2 + strlen ("_from_arm") | |
9333 | && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm", | |
9334 | strlen ("_from_arm")) == 0))) | |
9335 | { | |
9336 | char *target_name; | |
9337 | int target_len = namelen - 2; | |
3b7344d5 | 9338 | struct bound_minimal_symbol minsym; |
faa95490 DJ |
9339 | struct objfile *objfile; |
9340 | struct obj_section *sec; | |
9341 | ||
9342 | if (name[namelen - 1] == 'b') | |
9343 | target_len -= strlen ("_from_thumb"); | |
9344 | else | |
9345 | target_len -= strlen ("_from_arm"); | |
9346 | ||
9347 | target_name = alloca (target_len + 1); | |
9348 | memcpy (target_name, name + 2, target_len); | |
9349 | target_name[target_len] = '\0'; | |
9350 | ||
9351 | sec = find_pc_section (pc); | |
9352 | objfile = (sec == NULL) ? NULL : sec->objfile; | |
9353 | minsym = lookup_minimal_symbol (target_name, NULL, objfile); | |
3b7344d5 | 9354 | if (minsym.minsym != NULL) |
77e371c0 | 9355 | return BMSYMBOL_VALUE_ADDRESS (minsym); |
faa95490 DJ |
9356 | else |
9357 | return 0; | |
9358 | } | |
9359 | ||
c5aa993b | 9360 | return 0; /* not a stub */ |
c906108c SS |
9361 | } |
9362 | ||
afd7eef0 RE |
9363 | static void |
9364 | set_arm_command (char *args, int from_tty) | |
9365 | { | |
edefbb7c AC |
9366 | printf_unfiltered (_("\ |
9367 | \"set arm\" must be followed by an apporpriate subcommand.\n")); | |
afd7eef0 RE |
9368 | help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout); |
9369 | } | |
9370 | ||
9371 | static void | |
9372 | show_arm_command (char *args, int from_tty) | |
9373 | { | |
26304000 | 9374 | cmd_show_list (showarmcmdlist, from_tty, ""); |
afd7eef0 RE |
9375 | } |
9376 | ||
28e97307 DJ |
9377 | static void |
9378 | arm_update_current_architecture (void) | |
fd50bc42 | 9379 | { |
28e97307 | 9380 | struct gdbarch_info info; |
fd50bc42 | 9381 | |
28e97307 | 9382 | /* If the current architecture is not ARM, we have nothing to do. */ |
f5656ead | 9383 | if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_arm) |
28e97307 | 9384 | return; |
fd50bc42 | 9385 | |
28e97307 DJ |
9386 | /* Update the architecture. */ |
9387 | gdbarch_info_init (&info); | |
fd50bc42 | 9388 | |
28e97307 | 9389 | if (!gdbarch_update_p (info)) |
9b20d036 | 9390 | internal_error (__FILE__, __LINE__, _("could not update architecture")); |
fd50bc42 RE |
9391 | } |
9392 | ||
9393 | static void | |
9394 | set_fp_model_sfunc (char *args, int from_tty, | |
9395 | struct cmd_list_element *c) | |
9396 | { | |
9397 | enum arm_float_model fp_model; | |
9398 | ||
9399 | for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++) | |
9400 | if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0) | |
9401 | { | |
9402 | arm_fp_model = fp_model; | |
9403 | break; | |
9404 | } | |
9405 | ||
9406 | if (fp_model == ARM_FLOAT_LAST) | |
edefbb7c | 9407 | internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."), |
fd50bc42 RE |
9408 | current_fp_model); |
9409 | ||
28e97307 | 9410 | arm_update_current_architecture (); |
fd50bc42 RE |
9411 | } |
9412 | ||
9413 | static void | |
08546159 AC |
9414 | show_fp_model (struct ui_file *file, int from_tty, |
9415 | struct cmd_list_element *c, const char *value) | |
fd50bc42 | 9416 | { |
f5656ead | 9417 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
fd50bc42 | 9418 | |
28e97307 | 9419 | if (arm_fp_model == ARM_FLOAT_AUTO |
f5656ead | 9420 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
9421 | fprintf_filtered (file, _("\ |
9422 | The current ARM floating point model is \"auto\" (currently \"%s\").\n"), | |
9423 | fp_model_strings[tdep->fp_model]); | |
9424 | else | |
9425 | fprintf_filtered (file, _("\ | |
9426 | The current ARM floating point model is \"%s\".\n"), | |
9427 | fp_model_strings[arm_fp_model]); | |
9428 | } | |
9429 | ||
9430 | static void | |
9431 | arm_set_abi (char *args, int from_tty, | |
9432 | struct cmd_list_element *c) | |
9433 | { | |
9434 | enum arm_abi_kind arm_abi; | |
9435 | ||
9436 | for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++) | |
9437 | if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0) | |
9438 | { | |
9439 | arm_abi_global = arm_abi; | |
9440 | break; | |
9441 | } | |
9442 | ||
9443 | if (arm_abi == ARM_ABI_LAST) | |
9444 | internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."), | |
9445 | arm_abi_string); | |
9446 | ||
9447 | arm_update_current_architecture (); | |
9448 | } | |
9449 | ||
9450 | static void | |
9451 | arm_show_abi (struct ui_file *file, int from_tty, | |
9452 | struct cmd_list_element *c, const char *value) | |
9453 | { | |
f5656ead | 9454 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
28e97307 DJ |
9455 | |
9456 | if (arm_abi_global == ARM_ABI_AUTO | |
f5656ead | 9457 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
9458 | fprintf_filtered (file, _("\ |
9459 | The current ARM ABI is \"auto\" (currently \"%s\").\n"), | |
9460 | arm_abi_strings[tdep->arm_abi]); | |
9461 | else | |
9462 | fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"), | |
9463 | arm_abi_string); | |
fd50bc42 RE |
9464 | } |
9465 | ||
0428b8f5 DJ |
9466 | static void |
9467 | arm_show_fallback_mode (struct ui_file *file, int from_tty, | |
9468 | struct cmd_list_element *c, const char *value) | |
9469 | { | |
0963b4bd MS |
9470 | fprintf_filtered (file, |
9471 | _("The current execution mode assumed " | |
9472 | "(when symbols are unavailable) is \"%s\".\n"), | |
0428b8f5 DJ |
9473 | arm_fallback_mode_string); |
9474 | } | |
9475 | ||
9476 | static void | |
9477 | arm_show_force_mode (struct ui_file *file, int from_tty, | |
9478 | struct cmd_list_element *c, const char *value) | |
9479 | { | |
f5656ead | 9480 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
0428b8f5 | 9481 | |
0963b4bd MS |
9482 | fprintf_filtered (file, |
9483 | _("The current execution mode assumed " | |
9484 | "(even when symbols are available) is \"%s\".\n"), | |
0428b8f5 DJ |
9485 | arm_force_mode_string); |
9486 | } | |
9487 | ||
afd7eef0 RE |
9488 | /* If the user changes the register disassembly style used for info |
9489 | register and other commands, we have to also switch the style used | |
9490 | in opcodes for disassembly output. This function is run in the "set | |
9491 | arm disassembly" command, and does that. */ | |
bc90b915 FN |
9492 | |
9493 | static void | |
afd7eef0 | 9494 | set_disassembly_style_sfunc (char *args, int from_tty, |
bc90b915 FN |
9495 | struct cmd_list_element *c) |
9496 | { | |
afd7eef0 | 9497 | set_disassembly_style (); |
bc90b915 FN |
9498 | } |
9499 | \f | |
966fbf70 | 9500 | /* Return the ARM register name corresponding to register I. */ |
a208b0cb | 9501 | static const char * |
d93859e2 | 9502 | arm_register_name (struct gdbarch *gdbarch, int i) |
966fbf70 | 9503 | { |
58d6951d DJ |
9504 | const int num_regs = gdbarch_num_regs (gdbarch); |
9505 | ||
9506 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
9507 | && i >= num_regs && i < num_regs + 32) | |
9508 | { | |
9509 | static const char *const vfp_pseudo_names[] = { | |
9510 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", | |
9511 | "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", | |
9512 | "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", | |
9513 | "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", | |
9514 | }; | |
9515 | ||
9516 | return vfp_pseudo_names[i - num_regs]; | |
9517 | } | |
9518 | ||
9519 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
9520 | && i >= num_regs + 32 && i < num_regs + 32 + 16) | |
9521 | { | |
9522 | static const char *const neon_pseudo_names[] = { | |
9523 | "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", | |
9524 | "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15", | |
9525 | }; | |
9526 | ||
9527 | return neon_pseudo_names[i - num_regs - 32]; | |
9528 | } | |
9529 | ||
ff6f572f DJ |
9530 | if (i >= ARRAY_SIZE (arm_register_names)) |
9531 | /* These registers are only supported on targets which supply | |
9532 | an XML description. */ | |
9533 | return ""; | |
9534 | ||
966fbf70 RE |
9535 | return arm_register_names[i]; |
9536 | } | |
9537 | ||
bc90b915 | 9538 | static void |
afd7eef0 | 9539 | set_disassembly_style (void) |
bc90b915 | 9540 | { |
123dc839 | 9541 | int current; |
bc90b915 | 9542 | |
123dc839 DJ |
9543 | /* Find the style that the user wants. */ |
9544 | for (current = 0; current < num_disassembly_options; current++) | |
9545 | if (disassembly_style == valid_disassembly_styles[current]) | |
9546 | break; | |
9547 | gdb_assert (current < num_disassembly_options); | |
bc90b915 | 9548 | |
94c30b78 | 9549 | /* Synchronize the disassembler. */ |
bc90b915 FN |
9550 | set_arm_regname_option (current); |
9551 | } | |
9552 | ||
082fc60d RE |
9553 | /* Test whether the coff symbol specific value corresponds to a Thumb |
9554 | function. */ | |
9555 | ||
9556 | static int | |
9557 | coff_sym_is_thumb (int val) | |
9558 | { | |
f8bf5763 PM |
9559 | return (val == C_THUMBEXT |
9560 | || val == C_THUMBSTAT | |
9561 | || val == C_THUMBEXTFUNC | |
9562 | || val == C_THUMBSTATFUNC | |
9563 | || val == C_THUMBLABEL); | |
082fc60d RE |
9564 | } |
9565 | ||
9566 | /* arm_coff_make_msymbol_special() | |
9567 | arm_elf_make_msymbol_special() | |
9568 | ||
9569 | These functions test whether the COFF or ELF symbol corresponds to | |
9570 | an address in thumb code, and set a "special" bit in a minimal | |
9571 | symbol to indicate that it does. */ | |
9572 | ||
34e8f22d | 9573 | static void |
082fc60d RE |
9574 | arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym) |
9575 | { | |
467d42c4 UW |
9576 | if (ARM_SYM_BRANCH_TYPE (&((elf_symbol_type *)sym)->internal_elf_sym) |
9577 | == ST_BRANCH_TO_THUMB) | |
082fc60d RE |
9578 | MSYMBOL_SET_SPECIAL (msym); |
9579 | } | |
9580 | ||
34e8f22d | 9581 | static void |
082fc60d RE |
9582 | arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym) |
9583 | { | |
9584 | if (coff_sym_is_thumb (val)) | |
9585 | MSYMBOL_SET_SPECIAL (msym); | |
9586 | } | |
9587 | ||
60c5725c | 9588 | static void |
c1bd65d0 | 9589 | arm_objfile_data_free (struct objfile *objfile, void *arg) |
60c5725c DJ |
9590 | { |
9591 | struct arm_per_objfile *data = arg; | |
9592 | unsigned int i; | |
9593 | ||
9594 | for (i = 0; i < objfile->obfd->section_count; i++) | |
9595 | VEC_free (arm_mapping_symbol_s, data->section_maps[i]); | |
9596 | } | |
9597 | ||
9598 | static void | |
9599 | arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile, | |
9600 | asymbol *sym) | |
9601 | { | |
9602 | const char *name = bfd_asymbol_name (sym); | |
9603 | struct arm_per_objfile *data; | |
9604 | VEC(arm_mapping_symbol_s) **map_p; | |
9605 | struct arm_mapping_symbol new_map_sym; | |
9606 | ||
9607 | gdb_assert (name[0] == '$'); | |
9608 | if (name[1] != 'a' && name[1] != 't' && name[1] != 'd') | |
9609 | return; | |
9610 | ||
9611 | data = objfile_data (objfile, arm_objfile_data_key); | |
9612 | if (data == NULL) | |
9613 | { | |
9614 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, | |
9615 | struct arm_per_objfile); | |
9616 | set_objfile_data (objfile, arm_objfile_data_key, data); | |
9617 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
9618 | objfile->obfd->section_count, | |
9619 | VEC(arm_mapping_symbol_s) *); | |
9620 | } | |
9621 | map_p = &data->section_maps[bfd_get_section (sym)->index]; | |
9622 | ||
9623 | new_map_sym.value = sym->value; | |
9624 | new_map_sym.type = name[1]; | |
9625 | ||
9626 | /* Assume that most mapping symbols appear in order of increasing | |
9627 | value. If they were randomly distributed, it would be faster to | |
9628 | always push here and then sort at first use. */ | |
9629 | if (!VEC_empty (arm_mapping_symbol_s, *map_p)) | |
9630 | { | |
9631 | struct arm_mapping_symbol *prev_map_sym; | |
9632 | ||
9633 | prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p); | |
9634 | if (prev_map_sym->value >= sym->value) | |
9635 | { | |
9636 | unsigned int idx; | |
9637 | idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym, | |
9638 | arm_compare_mapping_symbols); | |
9639 | VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym); | |
9640 | return; | |
9641 | } | |
9642 | } | |
9643 | ||
9644 | VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym); | |
9645 | } | |
9646 | ||
756fe439 | 9647 | static void |
61a1198a | 9648 | arm_write_pc (struct regcache *regcache, CORE_ADDR pc) |
756fe439 | 9649 | { |
9779414d | 9650 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
61a1198a | 9651 | regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc); |
756fe439 DJ |
9652 | |
9653 | /* If necessary, set the T bit. */ | |
9654 | if (arm_apcs_32) | |
9655 | { | |
9779414d | 9656 | ULONGEST val, t_bit; |
61a1198a | 9657 | regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val); |
9779414d DJ |
9658 | t_bit = arm_psr_thumb_bit (gdbarch); |
9659 | if (arm_pc_is_thumb (gdbarch, pc)) | |
9660 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, | |
9661 | val | t_bit); | |
756fe439 | 9662 | else |
61a1198a | 9663 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
9779414d | 9664 | val & ~t_bit); |
756fe439 DJ |
9665 | } |
9666 | } | |
123dc839 | 9667 | |
58d6951d DJ |
9668 | /* Read the contents of a NEON quad register, by reading from two |
9669 | double registers. This is used to implement the quad pseudo | |
9670 | registers, and for argument passing in case the quad registers are | |
9671 | missing; vectors are passed in quad registers when using the VFP | |
9672 | ABI, even if a NEON unit is not present. REGNUM is the index of | |
9673 | the quad register, in [0, 15]. */ | |
9674 | ||
05d1431c | 9675 | static enum register_status |
58d6951d DJ |
9676 | arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache, |
9677 | int regnum, gdb_byte *buf) | |
9678 | { | |
9679 | char name_buf[4]; | |
9680 | gdb_byte reg_buf[8]; | |
9681 | int offset, double_regnum; | |
05d1431c | 9682 | enum register_status status; |
58d6951d | 9683 | |
8c042590 | 9684 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
9685 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9686 | strlen (name_buf)); | |
9687 | ||
9688 | /* d0 is always the least significant half of q0. */ | |
9689 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9690 | offset = 8; | |
9691 | else | |
9692 | offset = 0; | |
9693 | ||
05d1431c PA |
9694 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
9695 | if (status != REG_VALID) | |
9696 | return status; | |
58d6951d DJ |
9697 | memcpy (buf + offset, reg_buf, 8); |
9698 | ||
9699 | offset = 8 - offset; | |
05d1431c PA |
9700 | status = regcache_raw_read (regcache, double_regnum + 1, reg_buf); |
9701 | if (status != REG_VALID) | |
9702 | return status; | |
58d6951d | 9703 | memcpy (buf + offset, reg_buf, 8); |
05d1431c PA |
9704 | |
9705 | return REG_VALID; | |
58d6951d DJ |
9706 | } |
9707 | ||
05d1431c | 9708 | static enum register_status |
58d6951d DJ |
9709 | arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache, |
9710 | int regnum, gdb_byte *buf) | |
9711 | { | |
9712 | const int num_regs = gdbarch_num_regs (gdbarch); | |
9713 | char name_buf[4]; | |
9714 | gdb_byte reg_buf[8]; | |
9715 | int offset, double_regnum; | |
9716 | ||
9717 | gdb_assert (regnum >= num_regs); | |
9718 | regnum -= num_regs; | |
9719 | ||
9720 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
9721 | /* Quad-precision register. */ | |
05d1431c | 9722 | return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf); |
58d6951d DJ |
9723 | else |
9724 | { | |
05d1431c PA |
9725 | enum register_status status; |
9726 | ||
58d6951d DJ |
9727 | /* Single-precision register. */ |
9728 | gdb_assert (regnum < 32); | |
9729 | ||
9730 | /* s0 is always the least significant half of d0. */ | |
9731 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9732 | offset = (regnum & 1) ? 0 : 4; | |
9733 | else | |
9734 | offset = (regnum & 1) ? 4 : 0; | |
9735 | ||
8c042590 | 9736 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
9737 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9738 | strlen (name_buf)); | |
9739 | ||
05d1431c PA |
9740 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
9741 | if (status == REG_VALID) | |
9742 | memcpy (buf, reg_buf + offset, 4); | |
9743 | return status; | |
58d6951d DJ |
9744 | } |
9745 | } | |
9746 | ||
9747 | /* Store the contents of BUF to a NEON quad register, by writing to | |
9748 | two double registers. This is used to implement the quad pseudo | |
9749 | registers, and for argument passing in case the quad registers are | |
9750 | missing; vectors are passed in quad registers when using the VFP | |
9751 | ABI, even if a NEON unit is not present. REGNUM is the index | |
9752 | of the quad register, in [0, 15]. */ | |
9753 | ||
9754 | static void | |
9755 | arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
9756 | int regnum, const gdb_byte *buf) | |
9757 | { | |
9758 | char name_buf[4]; | |
58d6951d DJ |
9759 | int offset, double_regnum; |
9760 | ||
8c042590 | 9761 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
9762 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9763 | strlen (name_buf)); | |
9764 | ||
9765 | /* d0 is always the least significant half of q0. */ | |
9766 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9767 | offset = 8; | |
9768 | else | |
9769 | offset = 0; | |
9770 | ||
9771 | regcache_raw_write (regcache, double_regnum, buf + offset); | |
9772 | offset = 8 - offset; | |
9773 | regcache_raw_write (regcache, double_regnum + 1, buf + offset); | |
9774 | } | |
9775 | ||
9776 | static void | |
9777 | arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
9778 | int regnum, const gdb_byte *buf) | |
9779 | { | |
9780 | const int num_regs = gdbarch_num_regs (gdbarch); | |
9781 | char name_buf[4]; | |
9782 | gdb_byte reg_buf[8]; | |
9783 | int offset, double_regnum; | |
9784 | ||
9785 | gdb_assert (regnum >= num_regs); | |
9786 | regnum -= num_regs; | |
9787 | ||
9788 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
9789 | /* Quad-precision register. */ | |
9790 | arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf); | |
9791 | else | |
9792 | { | |
9793 | /* Single-precision register. */ | |
9794 | gdb_assert (regnum < 32); | |
9795 | ||
9796 | /* s0 is always the least significant half of d0. */ | |
9797 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9798 | offset = (regnum & 1) ? 0 : 4; | |
9799 | else | |
9800 | offset = (regnum & 1) ? 4 : 0; | |
9801 | ||
8c042590 | 9802 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
9803 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9804 | strlen (name_buf)); | |
9805 | ||
9806 | regcache_raw_read (regcache, double_regnum, reg_buf); | |
9807 | memcpy (reg_buf + offset, buf, 4); | |
9808 | regcache_raw_write (regcache, double_regnum, reg_buf); | |
9809 | } | |
9810 | } | |
9811 | ||
123dc839 DJ |
9812 | static struct value * |
9813 | value_of_arm_user_reg (struct frame_info *frame, const void *baton) | |
9814 | { | |
9815 | const int *reg_p = baton; | |
9816 | return value_of_register (*reg_p, frame); | |
9817 | } | |
97e03143 | 9818 | \f |
70f80edf JT |
9819 | static enum gdb_osabi |
9820 | arm_elf_osabi_sniffer (bfd *abfd) | |
97e03143 | 9821 | { |
2af48f68 | 9822 | unsigned int elfosabi; |
70f80edf | 9823 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
97e03143 | 9824 | |
70f80edf | 9825 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
97e03143 | 9826 | |
28e97307 DJ |
9827 | if (elfosabi == ELFOSABI_ARM) |
9828 | /* GNU tools use this value. Check note sections in this case, | |
9829 | as well. */ | |
9830 | bfd_map_over_sections (abfd, | |
9831 | generic_elf_osabi_sniff_abi_tag_sections, | |
9832 | &osabi); | |
97e03143 | 9833 | |
28e97307 | 9834 | /* Anything else will be handled by the generic ELF sniffer. */ |
70f80edf | 9835 | return osabi; |
97e03143 RE |
9836 | } |
9837 | ||
54483882 YQ |
9838 | static int |
9839 | arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
9840 | struct reggroup *group) | |
9841 | { | |
2c291032 YQ |
9842 | /* FPS register's type is INT, but belongs to float_reggroup. Beside |
9843 | this, FPS register belongs to save_regroup, restore_reggroup, and | |
9844 | all_reggroup, of course. */ | |
54483882 | 9845 | if (regnum == ARM_FPS_REGNUM) |
2c291032 YQ |
9846 | return (group == float_reggroup |
9847 | || group == save_reggroup | |
9848 | || group == restore_reggroup | |
9849 | || group == all_reggroup); | |
54483882 YQ |
9850 | else |
9851 | return default_register_reggroup_p (gdbarch, regnum, group); | |
9852 | } | |
9853 | ||
25f8c692 JL |
9854 | \f |
9855 | /* For backward-compatibility we allow two 'g' packet lengths with | |
9856 | the remote protocol depending on whether FPA registers are | |
9857 | supplied. M-profile targets do not have FPA registers, but some | |
9858 | stubs already exist in the wild which use a 'g' packet which | |
9859 | supplies them albeit with dummy values. The packet format which | |
9860 | includes FPA registers should be considered deprecated for | |
9861 | M-profile targets. */ | |
9862 | ||
9863 | static void | |
9864 | arm_register_g_packet_guesses (struct gdbarch *gdbarch) | |
9865 | { | |
9866 | if (gdbarch_tdep (gdbarch)->is_m) | |
9867 | { | |
9868 | /* If we know from the executable this is an M-profile target, | |
9869 | cater for remote targets whose register set layout is the | |
9870 | same as the FPA layout. */ | |
9871 | register_remote_g_packet_guess (gdbarch, | |
03145bf4 | 9872 | /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */ |
25f8c692 JL |
9873 | (16 * INT_REGISTER_SIZE) |
9874 | + (8 * FP_REGISTER_SIZE) | |
9875 | + (2 * INT_REGISTER_SIZE), | |
9876 | tdesc_arm_with_m_fpa_layout); | |
9877 | ||
9878 | /* The regular M-profile layout. */ | |
9879 | register_remote_g_packet_guess (gdbarch, | |
9880 | /* r0-r12,sp,lr,pc; xpsr */ | |
9881 | (16 * INT_REGISTER_SIZE) | |
9882 | + INT_REGISTER_SIZE, | |
9883 | tdesc_arm_with_m); | |
3184d3f9 JL |
9884 | |
9885 | /* M-profile plus M4F VFP. */ | |
9886 | register_remote_g_packet_guess (gdbarch, | |
9887 | /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */ | |
9888 | (16 * INT_REGISTER_SIZE) | |
9889 | + (16 * VFP_REGISTER_SIZE) | |
9890 | + (2 * INT_REGISTER_SIZE), | |
9891 | tdesc_arm_with_m_vfp_d16); | |
25f8c692 JL |
9892 | } |
9893 | ||
9894 | /* Otherwise we don't have a useful guess. */ | |
9895 | } | |
9896 | ||
70f80edf | 9897 | \f |
da3c6d4a MS |
9898 | /* Initialize the current architecture based on INFO. If possible, |
9899 | re-use an architecture from ARCHES, which is a list of | |
9900 | architectures already created during this debugging session. | |
97e03143 | 9901 | |
da3c6d4a MS |
9902 | Called e.g. at program startup, when reading a core file, and when |
9903 | reading a binary file. */ | |
97e03143 | 9904 | |
39bbf761 RE |
9905 | static struct gdbarch * |
9906 | arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
9907 | { | |
97e03143 | 9908 | struct gdbarch_tdep *tdep; |
39bbf761 | 9909 | struct gdbarch *gdbarch; |
28e97307 DJ |
9910 | struct gdbarch_list *best_arch; |
9911 | enum arm_abi_kind arm_abi = arm_abi_global; | |
9912 | enum arm_float_model fp_model = arm_fp_model; | |
123dc839 | 9913 | struct tdesc_arch_data *tdesc_data = NULL; |
9779414d | 9914 | int i, is_m = 0; |
58d6951d DJ |
9915 | int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0; |
9916 | int have_neon = 0; | |
ff6f572f | 9917 | int have_fpa_registers = 1; |
9779414d DJ |
9918 | const struct target_desc *tdesc = info.target_desc; |
9919 | ||
9920 | /* If we have an object to base this architecture on, try to determine | |
9921 | its ABI. */ | |
9922 | ||
9923 | if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL) | |
9924 | { | |
9925 | int ei_osabi, e_flags; | |
9926 | ||
9927 | switch (bfd_get_flavour (info.abfd)) | |
9928 | { | |
9929 | case bfd_target_aout_flavour: | |
9930 | /* Assume it's an old APCS-style ABI. */ | |
9931 | arm_abi = ARM_ABI_APCS; | |
9932 | break; | |
9933 | ||
9934 | case bfd_target_coff_flavour: | |
9935 | /* Assume it's an old APCS-style ABI. */ | |
9936 | /* XXX WinCE? */ | |
9937 | arm_abi = ARM_ABI_APCS; | |
9938 | break; | |
9939 | ||
9940 | case bfd_target_elf_flavour: | |
9941 | ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI]; | |
9942 | e_flags = elf_elfheader (info.abfd)->e_flags; | |
9943 | ||
9944 | if (ei_osabi == ELFOSABI_ARM) | |
9945 | { | |
9946 | /* GNU tools used to use this value, but do not for EABI | |
9947 | objects. There's nowhere to tag an EABI version | |
9948 | anyway, so assume APCS. */ | |
9949 | arm_abi = ARM_ABI_APCS; | |
9950 | } | |
9951 | else if (ei_osabi == ELFOSABI_NONE) | |
9952 | { | |
9953 | int eabi_ver = EF_ARM_EABI_VERSION (e_flags); | |
9954 | int attr_arch, attr_profile; | |
9955 | ||
9956 | switch (eabi_ver) | |
9957 | { | |
9958 | case EF_ARM_EABI_UNKNOWN: | |
9959 | /* Assume GNU tools. */ | |
9960 | arm_abi = ARM_ABI_APCS; | |
9961 | break; | |
9962 | ||
9963 | case EF_ARM_EABI_VER4: | |
9964 | case EF_ARM_EABI_VER5: | |
9965 | arm_abi = ARM_ABI_AAPCS; | |
9966 | /* EABI binaries default to VFP float ordering. | |
9967 | They may also contain build attributes that can | |
9968 | be used to identify if the VFP argument-passing | |
9969 | ABI is in use. */ | |
9970 | if (fp_model == ARM_FLOAT_AUTO) | |
9971 | { | |
9972 | #ifdef HAVE_ELF | |
9973 | switch (bfd_elf_get_obj_attr_int (info.abfd, | |
9974 | OBJ_ATTR_PROC, | |
9975 | Tag_ABI_VFP_args)) | |
9976 | { | |
9977 | case 0: | |
9978 | /* "The user intended FP parameter/result | |
9979 | passing to conform to AAPCS, base | |
9980 | variant". */ | |
9981 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9982 | break; | |
9983 | case 1: | |
9984 | /* "The user intended FP parameter/result | |
9985 | passing to conform to AAPCS, VFP | |
9986 | variant". */ | |
9987 | fp_model = ARM_FLOAT_VFP; | |
9988 | break; | |
9989 | case 2: | |
9990 | /* "The user intended FP parameter/result | |
9991 | passing to conform to tool chain-specific | |
9992 | conventions" - we don't know any such | |
9993 | conventions, so leave it as "auto". */ | |
9994 | break; | |
9995 | default: | |
9996 | /* Attribute value not mentioned in the | |
9997 | October 2008 ABI, so leave it as | |
9998 | "auto". */ | |
9999 | break; | |
10000 | } | |
10001 | #else | |
10002 | fp_model = ARM_FLOAT_SOFT_VFP; | |
10003 | #endif | |
10004 | } | |
10005 | break; | |
10006 | ||
10007 | default: | |
10008 | /* Leave it as "auto". */ | |
10009 | warning (_("unknown ARM EABI version 0x%x"), eabi_ver); | |
10010 | break; | |
10011 | } | |
10012 | ||
10013 | #ifdef HAVE_ELF | |
10014 | /* Detect M-profile programs. This only works if the | |
10015 | executable file includes build attributes; GCC does | |
10016 | copy them to the executable, but e.g. RealView does | |
10017 | not. */ | |
10018 | attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, | |
10019 | Tag_CPU_arch); | |
0963b4bd MS |
10020 | attr_profile = bfd_elf_get_obj_attr_int (info.abfd, |
10021 | OBJ_ATTR_PROC, | |
9779414d DJ |
10022 | Tag_CPU_arch_profile); |
10023 | /* GCC specifies the profile for v6-M; RealView only | |
10024 | specifies the profile for architectures starting with | |
10025 | V7 (as opposed to architectures with a tag | |
10026 | numerically greater than TAG_CPU_ARCH_V7). */ | |
10027 | if (!tdesc_has_registers (tdesc) | |
10028 | && (attr_arch == TAG_CPU_ARCH_V6_M | |
10029 | || attr_arch == TAG_CPU_ARCH_V6S_M | |
10030 | || attr_profile == 'M')) | |
25f8c692 | 10031 | is_m = 1; |
9779414d DJ |
10032 | #endif |
10033 | } | |
10034 | ||
10035 | if (fp_model == ARM_FLOAT_AUTO) | |
10036 | { | |
10037 | int e_flags = elf_elfheader (info.abfd)->e_flags; | |
10038 | ||
10039 | switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT)) | |
10040 | { | |
10041 | case 0: | |
10042 | /* Leave it as "auto". Strictly speaking this case | |
10043 | means FPA, but almost nobody uses that now, and | |
10044 | many toolchains fail to set the appropriate bits | |
10045 | for the floating-point model they use. */ | |
10046 | break; | |
10047 | case EF_ARM_SOFT_FLOAT: | |
10048 | fp_model = ARM_FLOAT_SOFT_FPA; | |
10049 | break; | |
10050 | case EF_ARM_VFP_FLOAT: | |
10051 | fp_model = ARM_FLOAT_VFP; | |
10052 | break; | |
10053 | case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT: | |
10054 | fp_model = ARM_FLOAT_SOFT_VFP; | |
10055 | break; | |
10056 | } | |
10057 | } | |
10058 | ||
10059 | if (e_flags & EF_ARM_BE8) | |
10060 | info.byte_order_for_code = BFD_ENDIAN_LITTLE; | |
10061 | ||
10062 | break; | |
10063 | ||
10064 | default: | |
10065 | /* Leave it as "auto". */ | |
10066 | break; | |
10067 | } | |
10068 | } | |
123dc839 DJ |
10069 | |
10070 | /* Check any target description for validity. */ | |
9779414d | 10071 | if (tdesc_has_registers (tdesc)) |
123dc839 DJ |
10072 | { |
10073 | /* For most registers we require GDB's default names; but also allow | |
10074 | the numeric names for sp / lr / pc, as a convenience. */ | |
10075 | static const char *const arm_sp_names[] = { "r13", "sp", NULL }; | |
10076 | static const char *const arm_lr_names[] = { "r14", "lr", NULL }; | |
10077 | static const char *const arm_pc_names[] = { "r15", "pc", NULL }; | |
10078 | ||
10079 | const struct tdesc_feature *feature; | |
58d6951d | 10080 | int valid_p; |
123dc839 | 10081 | |
9779414d | 10082 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
10083 | "org.gnu.gdb.arm.core"); |
10084 | if (feature == NULL) | |
9779414d DJ |
10085 | { |
10086 | feature = tdesc_find_feature (tdesc, | |
10087 | "org.gnu.gdb.arm.m-profile"); | |
10088 | if (feature == NULL) | |
10089 | return NULL; | |
10090 | else | |
10091 | is_m = 1; | |
10092 | } | |
123dc839 DJ |
10093 | |
10094 | tdesc_data = tdesc_data_alloc (); | |
10095 | ||
10096 | valid_p = 1; | |
10097 | for (i = 0; i < ARM_SP_REGNUM; i++) | |
10098 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
10099 | arm_register_names[i]); | |
10100 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10101 | ARM_SP_REGNUM, | |
10102 | arm_sp_names); | |
10103 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10104 | ARM_LR_REGNUM, | |
10105 | arm_lr_names); | |
10106 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10107 | ARM_PC_REGNUM, | |
10108 | arm_pc_names); | |
9779414d DJ |
10109 | if (is_m) |
10110 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10111 | ARM_PS_REGNUM, "xpsr"); | |
10112 | else | |
10113 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10114 | ARM_PS_REGNUM, "cpsr"); | |
123dc839 DJ |
10115 | |
10116 | if (!valid_p) | |
10117 | { | |
10118 | tdesc_data_cleanup (tdesc_data); | |
10119 | return NULL; | |
10120 | } | |
10121 | ||
9779414d | 10122 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
10123 | "org.gnu.gdb.arm.fpa"); |
10124 | if (feature != NULL) | |
10125 | { | |
10126 | valid_p = 1; | |
10127 | for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++) | |
10128 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
10129 | arm_register_names[i]); | |
10130 | if (!valid_p) | |
10131 | { | |
10132 | tdesc_data_cleanup (tdesc_data); | |
10133 | return NULL; | |
10134 | } | |
10135 | } | |
ff6f572f DJ |
10136 | else |
10137 | have_fpa_registers = 0; | |
10138 | ||
9779414d | 10139 | feature = tdesc_find_feature (tdesc, |
ff6f572f DJ |
10140 | "org.gnu.gdb.xscale.iwmmxt"); |
10141 | if (feature != NULL) | |
10142 | { | |
10143 | static const char *const iwmmxt_names[] = { | |
10144 | "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7", | |
10145 | "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15", | |
10146 | "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "", | |
10147 | "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "", | |
10148 | }; | |
10149 | ||
10150 | valid_p = 1; | |
10151 | for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++) | |
10152 | valid_p | |
10153 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
10154 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10155 | ||
10156 | /* Check for the control registers, but do not fail if they | |
10157 | are missing. */ | |
10158 | for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++) | |
10159 | tdesc_numbered_register (feature, tdesc_data, i, | |
10160 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10161 | ||
10162 | for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++) | |
10163 | valid_p | |
10164 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
10165 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10166 | ||
10167 | if (!valid_p) | |
10168 | { | |
10169 | tdesc_data_cleanup (tdesc_data); | |
10170 | return NULL; | |
10171 | } | |
10172 | } | |
58d6951d DJ |
10173 | |
10174 | /* If we have a VFP unit, check whether the single precision registers | |
10175 | are present. If not, then we will synthesize them as pseudo | |
10176 | registers. */ | |
9779414d | 10177 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
10178 | "org.gnu.gdb.arm.vfp"); |
10179 | if (feature != NULL) | |
10180 | { | |
10181 | static const char *const vfp_double_names[] = { | |
10182 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
10183 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", | |
10184 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", | |
10185 | "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", | |
10186 | }; | |
10187 | ||
10188 | /* Require the double precision registers. There must be either | |
10189 | 16 or 32. */ | |
10190 | valid_p = 1; | |
10191 | for (i = 0; i < 32; i++) | |
10192 | { | |
10193 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10194 | ARM_D0_REGNUM + i, | |
10195 | vfp_double_names[i]); | |
10196 | if (!valid_p) | |
10197 | break; | |
10198 | } | |
2b9e5ea6 UW |
10199 | if (!valid_p && i == 16) |
10200 | valid_p = 1; | |
58d6951d | 10201 | |
2b9e5ea6 UW |
10202 | /* Also require FPSCR. */ |
10203 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10204 | ARM_FPSCR_REGNUM, "fpscr"); | |
10205 | if (!valid_p) | |
58d6951d DJ |
10206 | { |
10207 | tdesc_data_cleanup (tdesc_data); | |
10208 | return NULL; | |
10209 | } | |
10210 | ||
10211 | if (tdesc_unnumbered_register (feature, "s0") == 0) | |
10212 | have_vfp_pseudos = 1; | |
10213 | ||
10214 | have_vfp_registers = 1; | |
10215 | ||
10216 | /* If we have VFP, also check for NEON. The architecture allows | |
10217 | NEON without VFP (integer vector operations only), but GDB | |
10218 | does not support that. */ | |
9779414d | 10219 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
10220 | "org.gnu.gdb.arm.neon"); |
10221 | if (feature != NULL) | |
10222 | { | |
10223 | /* NEON requires 32 double-precision registers. */ | |
10224 | if (i != 32) | |
10225 | { | |
10226 | tdesc_data_cleanup (tdesc_data); | |
10227 | return NULL; | |
10228 | } | |
10229 | ||
10230 | /* If there are quad registers defined by the stub, use | |
10231 | their type; otherwise (normally) provide them with | |
10232 | the default type. */ | |
10233 | if (tdesc_unnumbered_register (feature, "q0") == 0) | |
10234 | have_neon_pseudos = 1; | |
10235 | ||
10236 | have_neon = 1; | |
10237 | } | |
10238 | } | |
123dc839 | 10239 | } |
39bbf761 | 10240 | |
28e97307 DJ |
10241 | /* If there is already a candidate, use it. */ |
10242 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
10243 | best_arch != NULL; | |
10244 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
10245 | { | |
b8926edc DJ |
10246 | if (arm_abi != ARM_ABI_AUTO |
10247 | && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi) | |
28e97307 DJ |
10248 | continue; |
10249 | ||
b8926edc DJ |
10250 | if (fp_model != ARM_FLOAT_AUTO |
10251 | && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model) | |
28e97307 DJ |
10252 | continue; |
10253 | ||
58d6951d DJ |
10254 | /* There are various other properties in tdep that we do not |
10255 | need to check here: those derived from a target description, | |
10256 | since gdbarches with a different target description are | |
10257 | automatically disqualified. */ | |
10258 | ||
9779414d DJ |
10259 | /* Do check is_m, though, since it might come from the binary. */ |
10260 | if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m) | |
10261 | continue; | |
10262 | ||
28e97307 DJ |
10263 | /* Found a match. */ |
10264 | break; | |
10265 | } | |
97e03143 | 10266 | |
28e97307 | 10267 | if (best_arch != NULL) |
123dc839 DJ |
10268 | { |
10269 | if (tdesc_data != NULL) | |
10270 | tdesc_data_cleanup (tdesc_data); | |
10271 | return best_arch->gdbarch; | |
10272 | } | |
28e97307 DJ |
10273 | |
10274 | tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); | |
97e03143 RE |
10275 | gdbarch = gdbarch_alloc (&info, tdep); |
10276 | ||
28e97307 DJ |
10277 | /* Record additional information about the architecture we are defining. |
10278 | These are gdbarch discriminators, like the OSABI. */ | |
10279 | tdep->arm_abi = arm_abi; | |
10280 | tdep->fp_model = fp_model; | |
9779414d | 10281 | tdep->is_m = is_m; |
ff6f572f | 10282 | tdep->have_fpa_registers = have_fpa_registers; |
58d6951d DJ |
10283 | tdep->have_vfp_registers = have_vfp_registers; |
10284 | tdep->have_vfp_pseudos = have_vfp_pseudos; | |
10285 | tdep->have_neon_pseudos = have_neon_pseudos; | |
10286 | tdep->have_neon = have_neon; | |
08216dd7 | 10287 | |
25f8c692 JL |
10288 | arm_register_g_packet_guesses (gdbarch); |
10289 | ||
08216dd7 | 10290 | /* Breakpoints. */ |
9d4fde75 | 10291 | switch (info.byte_order_for_code) |
67255d04 RE |
10292 | { |
10293 | case BFD_ENDIAN_BIG: | |
66e810cd RE |
10294 | tdep->arm_breakpoint = arm_default_arm_be_breakpoint; |
10295 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint); | |
10296 | tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint; | |
10297 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint); | |
10298 | ||
67255d04 RE |
10299 | break; |
10300 | ||
10301 | case BFD_ENDIAN_LITTLE: | |
66e810cd RE |
10302 | tdep->arm_breakpoint = arm_default_arm_le_breakpoint; |
10303 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint); | |
10304 | tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint; | |
10305 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint); | |
10306 | ||
67255d04 RE |
10307 | break; |
10308 | ||
10309 | default: | |
10310 | internal_error (__FILE__, __LINE__, | |
edefbb7c | 10311 | _("arm_gdbarch_init: bad byte order for float format")); |
67255d04 RE |
10312 | } |
10313 | ||
d7b486e7 RE |
10314 | /* On ARM targets char defaults to unsigned. */ |
10315 | set_gdbarch_char_signed (gdbarch, 0); | |
10316 | ||
cca44b1b JB |
10317 | /* Note: for displaced stepping, this includes the breakpoint, and one word |
10318 | of additional scratch space. This setting isn't used for anything beside | |
10319 | displaced stepping at present. */ | |
10320 | set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS); | |
10321 | ||
9df628e0 | 10322 | /* This should be low enough for everything. */ |
97e03143 | 10323 | tdep->lowest_pc = 0x20; |
94c30b78 | 10324 | tdep->jb_pc = -1; /* Longjump support not enabled by default. */ |
97e03143 | 10325 | |
7c00367c MK |
10326 | /* The default, for both APCS and AAPCS, is to return small |
10327 | structures in registers. */ | |
10328 | tdep->struct_return = reg_struct_return; | |
10329 | ||
2dd604e7 | 10330 | set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call); |
f53f0d0b | 10331 | set_gdbarch_frame_align (gdbarch, arm_frame_align); |
39bbf761 | 10332 | |
756fe439 DJ |
10333 | set_gdbarch_write_pc (gdbarch, arm_write_pc); |
10334 | ||
148754e5 | 10335 | /* Frame handling. */ |
a262aec2 | 10336 | set_gdbarch_dummy_id (gdbarch, arm_dummy_id); |
eb5492fa DJ |
10337 | set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc); |
10338 | set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp); | |
10339 | ||
eb5492fa | 10340 | frame_base_set_default (gdbarch, &arm_normal_base); |
148754e5 | 10341 | |
34e8f22d | 10342 | /* Address manipulation. */ |
34e8f22d RE |
10343 | set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove); |
10344 | ||
34e8f22d RE |
10345 | /* Advance PC across function entry code. */ |
10346 | set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue); | |
10347 | ||
4024ca99 UW |
10348 | /* Detect whether PC is in function epilogue. */ |
10349 | set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p); | |
10350 | ||
190dce09 UW |
10351 | /* Skip trampolines. */ |
10352 | set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub); | |
10353 | ||
34e8f22d RE |
10354 | /* The stack grows downward. */ |
10355 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
10356 | ||
10357 | /* Breakpoint manipulation. */ | |
10358 | set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc); | |
177321bd DJ |
10359 | set_gdbarch_remote_breakpoint_from_pc (gdbarch, |
10360 | arm_remote_breakpoint_from_pc); | |
34e8f22d RE |
10361 | |
10362 | /* Information about registers, etc. */ | |
34e8f22d RE |
10363 | set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM); |
10364 | set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM); | |
ff6f572f | 10365 | set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS); |
7a5ea0d4 | 10366 | set_gdbarch_register_type (gdbarch, arm_register_type); |
54483882 | 10367 | set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p); |
34e8f22d | 10368 | |
ff6f572f DJ |
10369 | /* This "info float" is FPA-specific. Use the generic version if we |
10370 | do not have FPA. */ | |
10371 | if (gdbarch_tdep (gdbarch)->have_fpa_registers) | |
10372 | set_gdbarch_print_float_info (gdbarch, arm_print_float_info); | |
10373 | ||
26216b98 | 10374 | /* Internal <-> external register number maps. */ |
ff6f572f | 10375 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum); |
26216b98 AC |
10376 | set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno); |
10377 | ||
34e8f22d RE |
10378 | set_gdbarch_register_name (gdbarch, arm_register_name); |
10379 | ||
10380 | /* Returning results. */ | |
2af48f68 | 10381 | set_gdbarch_return_value (gdbarch, arm_return_value); |
34e8f22d | 10382 | |
03d48a7d RE |
10383 | /* Disassembly. */ |
10384 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm); | |
10385 | ||
34e8f22d RE |
10386 | /* Minsymbol frobbing. */ |
10387 | set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special); | |
10388 | set_gdbarch_coff_make_msymbol_special (gdbarch, | |
10389 | arm_coff_make_msymbol_special); | |
60c5725c | 10390 | set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol); |
34e8f22d | 10391 | |
f9d67f43 DJ |
10392 | /* Thumb-2 IT block support. */ |
10393 | set_gdbarch_adjust_breakpoint_address (gdbarch, | |
10394 | arm_adjust_breakpoint_address); | |
10395 | ||
0d5de010 DJ |
10396 | /* Virtual tables. */ |
10397 | set_gdbarch_vbit_in_delta (gdbarch, 1); | |
10398 | ||
97e03143 | 10399 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
4be87837 | 10400 | gdbarch_init_osabi (info, gdbarch); |
97e03143 | 10401 | |
b39cc962 DJ |
10402 | dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg); |
10403 | ||
eb5492fa | 10404 | /* Add some default predicates. */ |
2ae28aa9 YQ |
10405 | if (is_m) |
10406 | frame_unwind_append_unwinder (gdbarch, &arm_m_exception_unwind); | |
a262aec2 DJ |
10407 | frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind); |
10408 | dwarf2_append_unwinders (gdbarch); | |
0e9e9abd | 10409 | frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind); |
a262aec2 | 10410 | frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind); |
eb5492fa | 10411 | |
97e03143 RE |
10412 | /* Now we have tuned the configuration, set a few final things, |
10413 | based on what the OS ABI has told us. */ | |
10414 | ||
b8926edc DJ |
10415 | /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI |
10416 | binaries are always marked. */ | |
10417 | if (tdep->arm_abi == ARM_ABI_AUTO) | |
10418 | tdep->arm_abi = ARM_ABI_APCS; | |
10419 | ||
e3039479 UW |
10420 | /* Watchpoints are not steppable. */ |
10421 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); | |
10422 | ||
b8926edc DJ |
10423 | /* We used to default to FPA for generic ARM, but almost nobody |
10424 | uses that now, and we now provide a way for the user to force | |
10425 | the model. So default to the most useful variant. */ | |
10426 | if (tdep->fp_model == ARM_FLOAT_AUTO) | |
10427 | tdep->fp_model = ARM_FLOAT_SOFT_FPA; | |
10428 | ||
9df628e0 RE |
10429 | if (tdep->jb_pc >= 0) |
10430 | set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target); | |
10431 | ||
08216dd7 | 10432 | /* Floating point sizes and format. */ |
8da61cc4 | 10433 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
b8926edc | 10434 | if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA) |
08216dd7 | 10435 | { |
8da61cc4 DJ |
10436 | set_gdbarch_double_format |
10437 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
10438 | set_gdbarch_long_double_format | |
10439 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
10440 | } | |
10441 | else | |
10442 | { | |
10443 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
10444 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
08216dd7 RE |
10445 | } |
10446 | ||
58d6951d DJ |
10447 | if (have_vfp_pseudos) |
10448 | { | |
10449 | /* NOTE: These are the only pseudo registers used by | |
10450 | the ARM target at the moment. If more are added, a | |
10451 | little more care in numbering will be needed. */ | |
10452 | ||
10453 | int num_pseudos = 32; | |
10454 | if (have_neon_pseudos) | |
10455 | num_pseudos += 16; | |
10456 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos); | |
10457 | set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read); | |
10458 | set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write); | |
10459 | } | |
10460 | ||
123dc839 | 10461 | if (tdesc_data) |
58d6951d DJ |
10462 | { |
10463 | set_tdesc_pseudo_register_name (gdbarch, arm_register_name); | |
10464 | ||
9779414d | 10465 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
58d6951d DJ |
10466 | |
10467 | /* Override tdesc_register_type to adjust the types of VFP | |
10468 | registers for NEON. */ | |
10469 | set_gdbarch_register_type (gdbarch, arm_register_type); | |
10470 | } | |
123dc839 DJ |
10471 | |
10472 | /* Add standard register aliases. We add aliases even for those | |
10473 | nanes which are used by the current architecture - it's simpler, | |
10474 | and does no harm, since nothing ever lists user registers. */ | |
10475 | for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++) | |
10476 | user_reg_add (gdbarch, arm_register_aliases[i].name, | |
10477 | value_of_arm_user_reg, &arm_register_aliases[i].regnum); | |
10478 | ||
39bbf761 RE |
10479 | return gdbarch; |
10480 | } | |
10481 | ||
97e03143 | 10482 | static void |
2af46ca0 | 10483 | arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
97e03143 | 10484 | { |
2af46ca0 | 10485 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
97e03143 RE |
10486 | |
10487 | if (tdep == NULL) | |
10488 | return; | |
10489 | ||
edefbb7c | 10490 | fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"), |
97e03143 RE |
10491 | (unsigned long) tdep->lowest_pc); |
10492 | } | |
10493 | ||
a78f21af AC |
10494 | extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */ |
10495 | ||
c906108c | 10496 | void |
ed9a39eb | 10497 | _initialize_arm_tdep (void) |
c906108c | 10498 | { |
bc90b915 FN |
10499 | struct ui_file *stb; |
10500 | long length; | |
26304000 | 10501 | struct cmd_list_element *new_set, *new_show; |
53904c9e AC |
10502 | const char *setname; |
10503 | const char *setdesc; | |
4bd7b427 | 10504 | const char *const *regnames; |
bc90b915 FN |
10505 | int numregs, i, j; |
10506 | static char *helptext; | |
edefbb7c AC |
10507 | char regdesc[1024], *rdptr = regdesc; |
10508 | size_t rest = sizeof (regdesc); | |
085dd6e6 | 10509 | |
42cf1509 | 10510 | gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep); |
97e03143 | 10511 | |
60c5725c | 10512 | arm_objfile_data_key |
c1bd65d0 | 10513 | = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free); |
60c5725c | 10514 | |
0e9e9abd UW |
10515 | /* Add ourselves to objfile event chain. */ |
10516 | observer_attach_new_objfile (arm_exidx_new_objfile); | |
10517 | arm_exidx_data_key | |
10518 | = register_objfile_data_with_cleanup (NULL, arm_exidx_data_free); | |
10519 | ||
70f80edf JT |
10520 | /* Register an ELF OS ABI sniffer for ARM binaries. */ |
10521 | gdbarch_register_osabi_sniffer (bfd_arch_arm, | |
10522 | bfd_target_elf_flavour, | |
10523 | arm_elf_osabi_sniffer); | |
10524 | ||
9779414d DJ |
10525 | /* Initialize the standard target descriptions. */ |
10526 | initialize_tdesc_arm_with_m (); | |
25f8c692 | 10527 | initialize_tdesc_arm_with_m_fpa_layout (); |
3184d3f9 | 10528 | initialize_tdesc_arm_with_m_vfp_d16 (); |
ef7e8358 UW |
10529 | initialize_tdesc_arm_with_iwmmxt (); |
10530 | initialize_tdesc_arm_with_vfpv2 (); | |
10531 | initialize_tdesc_arm_with_vfpv3 (); | |
10532 | initialize_tdesc_arm_with_neon (); | |
9779414d | 10533 | |
94c30b78 | 10534 | /* Get the number of possible sets of register names defined in opcodes. */ |
afd7eef0 RE |
10535 | num_disassembly_options = get_arm_regname_num_options (); |
10536 | ||
10537 | /* Add root prefix command for all "set arm"/"show arm" commands. */ | |
10538 | add_prefix_cmd ("arm", no_class, set_arm_command, | |
edefbb7c | 10539 | _("Various ARM-specific commands."), |
afd7eef0 RE |
10540 | &setarmcmdlist, "set arm ", 0, &setlist); |
10541 | ||
10542 | add_prefix_cmd ("arm", no_class, show_arm_command, | |
edefbb7c | 10543 | _("Various ARM-specific commands."), |
afd7eef0 | 10544 | &showarmcmdlist, "show arm ", 0, &showlist); |
bc90b915 | 10545 | |
94c30b78 | 10546 | /* Sync the opcode insn printer with our register viewer. */ |
bc90b915 | 10547 | parse_arm_disassembler_option ("reg-names-std"); |
c5aa993b | 10548 | |
eefe576e AC |
10549 | /* Initialize the array that will be passed to |
10550 | add_setshow_enum_cmd(). */ | |
afd7eef0 RE |
10551 | valid_disassembly_styles |
10552 | = xmalloc ((num_disassembly_options + 1) * sizeof (char *)); | |
10553 | for (i = 0; i < num_disassembly_options; i++) | |
bc90b915 FN |
10554 | { |
10555 | numregs = get_arm_regnames (i, &setname, &setdesc, ®names); | |
afd7eef0 | 10556 | valid_disassembly_styles[i] = setname; |
edefbb7c AC |
10557 | length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc); |
10558 | rdptr += length; | |
10559 | rest -= length; | |
123dc839 DJ |
10560 | /* When we find the default names, tell the disassembler to use |
10561 | them. */ | |
bc90b915 FN |
10562 | if (!strcmp (setname, "std")) |
10563 | { | |
afd7eef0 | 10564 | disassembly_style = setname; |
bc90b915 FN |
10565 | set_arm_regname_option (i); |
10566 | } | |
10567 | } | |
94c30b78 | 10568 | /* Mark the end of valid options. */ |
afd7eef0 | 10569 | valid_disassembly_styles[num_disassembly_options] = NULL; |
c906108c | 10570 | |
edefbb7c AC |
10571 | /* Create the help text. */ |
10572 | stb = mem_fileopen (); | |
10573 | fprintf_unfiltered (stb, "%s%s%s", | |
10574 | _("The valid values are:\n"), | |
10575 | regdesc, | |
10576 | _("The default is \"std\".")); | |
759ef836 | 10577 | helptext = ui_file_xstrdup (stb, NULL); |
bc90b915 | 10578 | ui_file_delete (stb); |
ed9a39eb | 10579 | |
edefbb7c AC |
10580 | add_setshow_enum_cmd("disassembler", no_class, |
10581 | valid_disassembly_styles, &disassembly_style, | |
10582 | _("Set the disassembly style."), | |
10583 | _("Show the disassembly style."), | |
10584 | helptext, | |
2c5b56ce | 10585 | set_disassembly_style_sfunc, |
0963b4bd MS |
10586 | NULL, /* FIXME: i18n: The disassembly style is |
10587 | \"%s\". */ | |
7376b4c2 | 10588 | &setarmcmdlist, &showarmcmdlist); |
edefbb7c AC |
10589 | |
10590 | add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32, | |
10591 | _("Set usage of ARM 32-bit mode."), | |
10592 | _("Show usage of ARM 32-bit mode."), | |
10593 | _("When off, a 26-bit PC will be used."), | |
2c5b56ce | 10594 | NULL, |
0963b4bd MS |
10595 | NULL, /* FIXME: i18n: Usage of ARM 32-bit |
10596 | mode is %s. */ | |
26304000 | 10597 | &setarmcmdlist, &showarmcmdlist); |
c906108c | 10598 | |
fd50bc42 | 10599 | /* Add a command to allow the user to force the FPU model. */ |
edefbb7c AC |
10600 | add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model, |
10601 | _("Set the floating point type."), | |
10602 | _("Show the floating point type."), | |
10603 | _("auto - Determine the FP typefrom the OS-ABI.\n\ | |
10604 | softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\ | |
10605 | fpa - FPA co-processor (GCC compiled).\n\ | |
10606 | softvfp - Software FP with pure-endian doubles.\n\ | |
10607 | vfp - VFP co-processor."), | |
edefbb7c | 10608 | set_fp_model_sfunc, show_fp_model, |
7376b4c2 | 10609 | &setarmcmdlist, &showarmcmdlist); |
fd50bc42 | 10610 | |
28e97307 DJ |
10611 | /* Add a command to allow the user to force the ABI. */ |
10612 | add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string, | |
10613 | _("Set the ABI."), | |
10614 | _("Show the ABI."), | |
10615 | NULL, arm_set_abi, arm_show_abi, | |
10616 | &setarmcmdlist, &showarmcmdlist); | |
10617 | ||
0428b8f5 DJ |
10618 | /* Add two commands to allow the user to force the assumed |
10619 | execution mode. */ | |
10620 | add_setshow_enum_cmd ("fallback-mode", class_support, | |
10621 | arm_mode_strings, &arm_fallback_mode_string, | |
10622 | _("Set the mode assumed when symbols are unavailable."), | |
10623 | _("Show the mode assumed when symbols are unavailable."), | |
10624 | NULL, NULL, arm_show_fallback_mode, | |
10625 | &setarmcmdlist, &showarmcmdlist); | |
10626 | add_setshow_enum_cmd ("force-mode", class_support, | |
10627 | arm_mode_strings, &arm_force_mode_string, | |
10628 | _("Set the mode assumed even when symbols are available."), | |
10629 | _("Show the mode assumed even when symbols are available."), | |
10630 | NULL, NULL, arm_show_force_mode, | |
10631 | &setarmcmdlist, &showarmcmdlist); | |
10632 | ||
6529d2dd | 10633 | /* Debugging flag. */ |
edefbb7c AC |
10634 | add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug, |
10635 | _("Set ARM debugging."), | |
10636 | _("Show ARM debugging."), | |
10637 | _("When on, arm-specific debugging is enabled."), | |
2c5b56ce | 10638 | NULL, |
7915a72c | 10639 | NULL, /* FIXME: i18n: "ARM debugging is %s. */ |
26304000 | 10640 | &setdebuglist, &showdebuglist); |
c906108c | 10641 | } |
72508ac0 PO |
10642 | |
10643 | /* ARM-reversible process record data structures. */ | |
10644 | ||
10645 | #define ARM_INSN_SIZE_BYTES 4 | |
10646 | #define THUMB_INSN_SIZE_BYTES 2 | |
10647 | #define THUMB2_INSN_SIZE_BYTES 4 | |
10648 | ||
10649 | ||
10650 | #define INSN_S_L_BIT_NUM 20 | |
10651 | ||
10652 | #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \ | |
10653 | do \ | |
10654 | { \ | |
10655 | unsigned int reg_len = LENGTH; \ | |
10656 | if (reg_len) \ | |
10657 | { \ | |
10658 | REGS = XNEWVEC (uint32_t, reg_len); \ | |
10659 | memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \ | |
10660 | } \ | |
10661 | } \ | |
10662 | while (0) | |
10663 | ||
10664 | #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \ | |
10665 | do \ | |
10666 | { \ | |
10667 | unsigned int mem_len = LENGTH; \ | |
10668 | if (mem_len) \ | |
10669 | { \ | |
10670 | MEMS = XNEWVEC (struct arm_mem_r, mem_len); \ | |
10671 | memcpy(&MEMS->len, &RECORD_BUF[0], \ | |
10672 | sizeof(struct arm_mem_r) * LENGTH); \ | |
10673 | } \ | |
10674 | } \ | |
10675 | while (0) | |
10676 | ||
10677 | /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */ | |
10678 | #define INSN_RECORDED(ARM_RECORD) \ | |
10679 | (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count) | |
10680 | ||
10681 | /* ARM memory record structure. */ | |
10682 | struct arm_mem_r | |
10683 | { | |
10684 | uint32_t len; /* Record length. */ | |
bfbbec00 | 10685 | uint32_t addr; /* Memory address. */ |
72508ac0 PO |
10686 | }; |
10687 | ||
10688 | /* ARM instruction record contains opcode of current insn | |
10689 | and execution state (before entry to decode_insn()), | |
10690 | contains list of to-be-modified registers and | |
10691 | memory blocks (on return from decode_insn()). */ | |
10692 | ||
10693 | typedef struct insn_decode_record_t | |
10694 | { | |
10695 | struct gdbarch *gdbarch; | |
10696 | struct regcache *regcache; | |
10697 | CORE_ADDR this_addr; /* Address of the insn being decoded. */ | |
10698 | uint32_t arm_insn; /* Should accommodate thumb. */ | |
10699 | uint32_t cond; /* Condition code. */ | |
10700 | uint32_t opcode; /* Insn opcode. */ | |
10701 | uint32_t decode; /* Insn decode bits. */ | |
10702 | uint32_t mem_rec_count; /* No of mem records. */ | |
10703 | uint32_t reg_rec_count; /* No of reg records. */ | |
10704 | uint32_t *arm_regs; /* Registers to be saved for this record. */ | |
10705 | struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */ | |
10706 | } insn_decode_record; | |
10707 | ||
10708 | ||
10709 | /* Checks ARM SBZ and SBO mandatory fields. */ | |
10710 | ||
10711 | static int | |
10712 | sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo) | |
10713 | { | |
10714 | uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1)); | |
10715 | ||
10716 | if (!len) | |
10717 | return 1; | |
10718 | ||
10719 | if (!sbo) | |
10720 | ones = ~ones; | |
10721 | ||
10722 | while (ones) | |
10723 | { | |
10724 | if (!(ones & sbo)) | |
10725 | { | |
10726 | return 0; | |
10727 | } | |
10728 | ones = ones >> 1; | |
10729 | } | |
10730 | return 1; | |
10731 | } | |
10732 | ||
c6ec2b30 OJ |
10733 | enum arm_record_result |
10734 | { | |
10735 | ARM_RECORD_SUCCESS = 0, | |
10736 | ARM_RECORD_FAILURE = 1 | |
10737 | }; | |
10738 | ||
72508ac0 PO |
10739 | typedef enum |
10740 | { | |
10741 | ARM_RECORD_STRH=1, | |
10742 | ARM_RECORD_STRD | |
10743 | } arm_record_strx_t; | |
10744 | ||
10745 | typedef enum | |
10746 | { | |
10747 | ARM_RECORD=1, | |
10748 | THUMB_RECORD, | |
10749 | THUMB2_RECORD | |
10750 | } record_type_t; | |
10751 | ||
10752 | ||
10753 | static int | |
10754 | arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf, | |
10755 | uint32_t *record_buf_mem, arm_record_strx_t str_type) | |
10756 | { | |
10757 | ||
10758 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10759 | ULONGEST u_regval[2]= {0}; | |
10760 | ||
10761 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
10762 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
10763 | uint32_t opcode1 = 0; | |
10764 | ||
10765 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
10766 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
10767 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
10768 | ||
10769 | ||
10770 | if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
10771 | { | |
10772 | /* 1) Handle misc store, immediate offset. */ | |
10773 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
10774 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
10775 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10776 | regcache_raw_read_unsigned (reg_cache, reg_src1, | |
10777 | &u_regval[0]); | |
10778 | if (ARM_PC_REGNUM == reg_src1) | |
10779 | { | |
10780 | /* If R15 was used as Rn, hence current PC+8. */ | |
10781 | u_regval[0] = u_regval[0] + 8; | |
10782 | } | |
10783 | offset_8 = (immed_high << 4) | immed_low; | |
10784 | /* Calculate target store address. */ | |
10785 | if (14 == arm_insn_r->opcode) | |
10786 | { | |
10787 | tgt_mem_addr = u_regval[0] + offset_8; | |
10788 | } | |
10789 | else | |
10790 | { | |
10791 | tgt_mem_addr = u_regval[0] - offset_8; | |
10792 | } | |
10793 | if (ARM_RECORD_STRH == str_type) | |
10794 | { | |
10795 | record_buf_mem[0] = 2; | |
10796 | record_buf_mem[1] = tgt_mem_addr; | |
10797 | arm_insn_r->mem_rec_count = 1; | |
10798 | } | |
10799 | else if (ARM_RECORD_STRD == str_type) | |
10800 | { | |
10801 | record_buf_mem[0] = 4; | |
10802 | record_buf_mem[1] = tgt_mem_addr; | |
10803 | record_buf_mem[2] = 4; | |
10804 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10805 | arm_insn_r->mem_rec_count = 2; | |
10806 | } | |
10807 | } | |
10808 | else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode) | |
10809 | { | |
10810 | /* 2) Store, register offset. */ | |
10811 | /* Get Rm. */ | |
10812 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10813 | /* Get Rn. */ | |
10814 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10815 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10816 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10817 | if (15 == reg_src2) | |
10818 | { | |
10819 | /* If R15 was used as Rn, hence current PC+8. */ | |
10820 | u_regval[0] = u_regval[0] + 8; | |
10821 | } | |
10822 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10823 | if (12 == arm_insn_r->opcode) | |
10824 | { | |
10825 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10826 | } | |
10827 | else | |
10828 | { | |
10829 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10830 | } | |
10831 | if (ARM_RECORD_STRH == str_type) | |
10832 | { | |
10833 | record_buf_mem[0] = 2; | |
10834 | record_buf_mem[1] = tgt_mem_addr; | |
10835 | arm_insn_r->mem_rec_count = 1; | |
10836 | } | |
10837 | else if (ARM_RECORD_STRD == str_type) | |
10838 | { | |
10839 | record_buf_mem[0] = 4; | |
10840 | record_buf_mem[1] = tgt_mem_addr; | |
10841 | record_buf_mem[2] = 4; | |
10842 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10843 | arm_insn_r->mem_rec_count = 2; | |
10844 | } | |
10845 | } | |
10846 | else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
10847 | || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
10848 | { | |
10849 | /* 3) Store, immediate pre-indexed. */ | |
10850 | /* 5) Store, immediate post-indexed. */ | |
10851 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
10852 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
10853 | offset_8 = (immed_high << 4) | immed_low; | |
10854 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10855 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10856 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10857 | if (15 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
10858 | { | |
10859 | tgt_mem_addr = u_regval[0] + offset_8; | |
10860 | } | |
10861 | else | |
10862 | { | |
10863 | tgt_mem_addr = u_regval[0] - offset_8; | |
10864 | } | |
10865 | if (ARM_RECORD_STRH == str_type) | |
10866 | { | |
10867 | record_buf_mem[0] = 2; | |
10868 | record_buf_mem[1] = tgt_mem_addr; | |
10869 | arm_insn_r->mem_rec_count = 1; | |
10870 | } | |
10871 | else if (ARM_RECORD_STRD == str_type) | |
10872 | { | |
10873 | record_buf_mem[0] = 4; | |
10874 | record_buf_mem[1] = tgt_mem_addr; | |
10875 | record_buf_mem[2] = 4; | |
10876 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10877 | arm_insn_r->mem_rec_count = 2; | |
10878 | } | |
10879 | /* Record Rn also as it changes. */ | |
10880 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
10881 | arm_insn_r->reg_rec_count = 1; | |
10882 | } | |
10883 | else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode | |
10884 | || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
10885 | { | |
10886 | /* 4) Store, register pre-indexed. */ | |
10887 | /* 6) Store, register post -indexed. */ | |
10888 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10889 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10890 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10891 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10892 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10893 | if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
10894 | { | |
10895 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10896 | } | |
10897 | else | |
10898 | { | |
10899 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10900 | } | |
10901 | if (ARM_RECORD_STRH == str_type) | |
10902 | { | |
10903 | record_buf_mem[0] = 2; | |
10904 | record_buf_mem[1] = tgt_mem_addr; | |
10905 | arm_insn_r->mem_rec_count = 1; | |
10906 | } | |
10907 | else if (ARM_RECORD_STRD == str_type) | |
10908 | { | |
10909 | record_buf_mem[0] = 4; | |
10910 | record_buf_mem[1] = tgt_mem_addr; | |
10911 | record_buf_mem[2] = 4; | |
10912 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10913 | arm_insn_r->mem_rec_count = 2; | |
10914 | } | |
10915 | /* Record Rn also as it changes. */ | |
10916 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
10917 | arm_insn_r->reg_rec_count = 1; | |
10918 | } | |
10919 | return 0; | |
10920 | } | |
10921 | ||
10922 | /* Handling ARM extension space insns. */ | |
10923 | ||
10924 | static int | |
10925 | arm_record_extension_space (insn_decode_record *arm_insn_r) | |
10926 | { | |
10927 | uint32_t ret = 0; /* Return value: -1:record failure ; 0:success */ | |
10928 | uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0; | |
10929 | uint32_t record_buf[8], record_buf_mem[8]; | |
10930 | uint32_t reg_src1 = 0; | |
10931 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
10932 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10933 | ULONGEST u_regval = 0; | |
10934 | ||
10935 | gdb_assert (!INSN_RECORDED(arm_insn_r)); | |
10936 | /* Handle unconditional insn extension space. */ | |
10937 | ||
10938 | opcode1 = bits (arm_insn_r->arm_insn, 20, 27); | |
10939 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10940 | if (arm_insn_r->cond) | |
10941 | { | |
10942 | /* PLD has no affect on architectural state, it just affects | |
10943 | the caches. */ | |
10944 | if (5 == ((opcode1 & 0xE0) >> 5)) | |
10945 | { | |
10946 | /* BLX(1) */ | |
10947 | record_buf[0] = ARM_PS_REGNUM; | |
10948 | record_buf[1] = ARM_LR_REGNUM; | |
10949 | arm_insn_r->reg_rec_count = 2; | |
10950 | } | |
10951 | /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */ | |
10952 | } | |
10953 | ||
10954 | ||
10955 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
10956 | if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4)) | |
10957 | { | |
10958 | ret = -1; | |
10959 | /* Undefined instruction on ARM V5; need to handle if later | |
10960 | versions define it. */ | |
10961 | } | |
10962 | ||
10963 | opcode1 = bits (arm_insn_r->arm_insn, 24, 27); | |
10964 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10965 | insn_op1 = bits (arm_insn_r->arm_insn, 20, 23); | |
10966 | ||
10967 | /* Handle arithmetic insn extension space. */ | |
10968 | if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond | |
10969 | && !INSN_RECORDED(arm_insn_r)) | |
10970 | { | |
10971 | /* Handle MLA(S) and MUL(S). */ | |
10972 | if (0 <= insn_op1 && 3 >= insn_op1) | |
10973 | { | |
10974 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10975 | record_buf[1] = ARM_PS_REGNUM; | |
10976 | arm_insn_r->reg_rec_count = 2; | |
10977 | } | |
10978 | else if (4 <= insn_op1 && 15 >= insn_op1) | |
10979 | { | |
10980 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ | |
10981 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
10982 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10983 | record_buf[2] = ARM_PS_REGNUM; | |
10984 | arm_insn_r->reg_rec_count = 3; | |
10985 | } | |
10986 | } | |
10987 | ||
10988 | opcode1 = bits (arm_insn_r->arm_insn, 26, 27); | |
10989 | opcode2 = bits (arm_insn_r->arm_insn, 23, 24); | |
10990 | insn_op1 = bits (arm_insn_r->arm_insn, 21, 22); | |
10991 | ||
10992 | /* Handle control insn extension space. */ | |
10993 | ||
10994 | if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20) | |
10995 | && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r)) | |
10996 | { | |
10997 | if (!bit (arm_insn_r->arm_insn,25)) | |
10998 | { | |
10999 | if (!bits (arm_insn_r->arm_insn, 4, 7)) | |
11000 | { | |
11001 | if ((0 == insn_op1) || (2 == insn_op1)) | |
11002 | { | |
11003 | /* MRS. */ | |
11004 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11005 | arm_insn_r->reg_rec_count = 1; | |
11006 | } | |
11007 | else if (1 == insn_op1) | |
11008 | { | |
11009 | /* CSPR is going to be changed. */ | |
11010 | record_buf[0] = ARM_PS_REGNUM; | |
11011 | arm_insn_r->reg_rec_count = 1; | |
11012 | } | |
11013 | else if (3 == insn_op1) | |
11014 | { | |
11015 | /* SPSR is going to be changed. */ | |
11016 | /* We need to get SPSR value, which is yet to be done. */ | |
11017 | printf_unfiltered (_("Process record does not support " | |
11018 | "instruction 0x%0x at address %s.\n"), | |
11019 | arm_insn_r->arm_insn, | |
11020 | paddress (arm_insn_r->gdbarch, | |
11021 | arm_insn_r->this_addr)); | |
11022 | return -1; | |
11023 | } | |
11024 | } | |
11025 | else if (1 == bits (arm_insn_r->arm_insn, 4, 7)) | |
11026 | { | |
11027 | if (1 == insn_op1) | |
11028 | { | |
11029 | /* BX. */ | |
11030 | record_buf[0] = ARM_PS_REGNUM; | |
11031 | arm_insn_r->reg_rec_count = 1; | |
11032 | } | |
11033 | else if (3 == insn_op1) | |
11034 | { | |
11035 | /* CLZ. */ | |
11036 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11037 | arm_insn_r->reg_rec_count = 1; | |
11038 | } | |
11039 | } | |
11040 | else if (3 == bits (arm_insn_r->arm_insn, 4, 7)) | |
11041 | { | |
11042 | /* BLX. */ | |
11043 | record_buf[0] = ARM_PS_REGNUM; | |
11044 | record_buf[1] = ARM_LR_REGNUM; | |
11045 | arm_insn_r->reg_rec_count = 2; | |
11046 | } | |
11047 | else if (5 == bits (arm_insn_r->arm_insn, 4, 7)) | |
11048 | { | |
11049 | /* QADD, QSUB, QDADD, QDSUB */ | |
11050 | record_buf[0] = ARM_PS_REGNUM; | |
11051 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
11052 | arm_insn_r->reg_rec_count = 2; | |
11053 | } | |
11054 | else if (7 == bits (arm_insn_r->arm_insn, 4, 7)) | |
11055 | { | |
11056 | /* BKPT. */ | |
11057 | record_buf[0] = ARM_PS_REGNUM; | |
11058 | record_buf[1] = ARM_LR_REGNUM; | |
11059 | arm_insn_r->reg_rec_count = 2; | |
11060 | ||
11061 | /* Save SPSR also;how? */ | |
11062 | printf_unfiltered (_("Process record does not support " | |
11063 | "instruction 0x%0x at address %s.\n"), | |
11064 | arm_insn_r->arm_insn, | |
11065 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11066 | return -1; | |
11067 | } | |
11068 | else if(8 == bits (arm_insn_r->arm_insn, 4, 7) | |
11069 | || 10 == bits (arm_insn_r->arm_insn, 4, 7) | |
11070 | || 12 == bits (arm_insn_r->arm_insn, 4, 7) | |
11071 | || 14 == bits (arm_insn_r->arm_insn, 4, 7) | |
11072 | ) | |
11073 | { | |
11074 | if (0 == insn_op1 || 1 == insn_op1) | |
11075 | { | |
11076 | /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */ | |
11077 | /* We dont do optimization for SMULW<y> where we | |
11078 | need only Rd. */ | |
11079 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11080 | record_buf[1] = ARM_PS_REGNUM; | |
11081 | arm_insn_r->reg_rec_count = 2; | |
11082 | } | |
11083 | else if (2 == insn_op1) | |
11084 | { | |
11085 | /* SMLAL<x><y>. */ | |
11086 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11087 | record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19); | |
11088 | arm_insn_r->reg_rec_count = 2; | |
11089 | } | |
11090 | else if (3 == insn_op1) | |
11091 | { | |
11092 | /* SMUL<x><y>. */ | |
11093 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11094 | arm_insn_r->reg_rec_count = 1; | |
11095 | } | |
11096 | } | |
11097 | } | |
11098 | else | |
11099 | { | |
11100 | /* MSR : immediate form. */ | |
11101 | if (1 == insn_op1) | |
11102 | { | |
11103 | /* CSPR is going to be changed. */ | |
11104 | record_buf[0] = ARM_PS_REGNUM; | |
11105 | arm_insn_r->reg_rec_count = 1; | |
11106 | } | |
11107 | else if (3 == insn_op1) | |
11108 | { | |
11109 | /* SPSR is going to be changed. */ | |
11110 | /* we need to get SPSR value, which is yet to be done */ | |
11111 | printf_unfiltered (_("Process record does not support " | |
11112 | "instruction 0x%0x at address %s.\n"), | |
11113 | arm_insn_r->arm_insn, | |
11114 | paddress (arm_insn_r->gdbarch, | |
11115 | arm_insn_r->this_addr)); | |
11116 | return -1; | |
11117 | } | |
11118 | } | |
11119 | } | |
11120 | ||
11121 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
11122 | opcode2 = bits (arm_insn_r->arm_insn, 20, 24); | |
11123 | insn_op1 = bits (arm_insn_r->arm_insn, 5, 6); | |
11124 | ||
11125 | /* Handle load/store insn extension space. */ | |
11126 | ||
11127 | if (!opcode1 && bit (arm_insn_r->arm_insn, 7) | |
11128 | && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond | |
11129 | && !INSN_RECORDED(arm_insn_r)) | |
11130 | { | |
11131 | /* SWP/SWPB. */ | |
11132 | if (0 == insn_op1) | |
11133 | { | |
11134 | /* These insn, changes register and memory as well. */ | |
11135 | /* SWP or SWPB insn. */ | |
11136 | /* Get memory address given by Rn. */ | |
11137 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11138 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11139 | /* SWP insn ?, swaps word. */ | |
11140 | if (8 == arm_insn_r->opcode) | |
11141 | { | |
11142 | record_buf_mem[0] = 4; | |
11143 | } | |
11144 | else | |
11145 | { | |
11146 | /* SWPB insn, swaps only byte. */ | |
11147 | record_buf_mem[0] = 1; | |
11148 | } | |
11149 | record_buf_mem[1] = u_regval; | |
11150 | arm_insn_r->mem_rec_count = 1; | |
11151 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11152 | arm_insn_r->reg_rec_count = 1; | |
11153 | } | |
11154 | else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11155 | { | |
11156 | /* STRH. */ | |
11157 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11158 | ARM_RECORD_STRH); | |
11159 | } | |
11160 | else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11161 | { | |
11162 | /* LDRD. */ | |
11163 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11164 | record_buf[1] = record_buf[0] + 1; | |
11165 | arm_insn_r->reg_rec_count = 2; | |
11166 | } | |
11167 | else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11168 | { | |
11169 | /* STRD. */ | |
11170 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11171 | ARM_RECORD_STRD); | |
11172 | } | |
11173 | else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3) | |
11174 | { | |
11175 | /* LDRH, LDRSB, LDRSH. */ | |
11176 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11177 | arm_insn_r->reg_rec_count = 1; | |
11178 | } | |
11179 | ||
11180 | } | |
11181 | ||
11182 | opcode1 = bits (arm_insn_r->arm_insn, 23, 27); | |
11183 | if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21) | |
11184 | && !INSN_RECORDED(arm_insn_r)) | |
11185 | { | |
11186 | ret = -1; | |
11187 | /* Handle coprocessor insn extension space. */ | |
11188 | } | |
11189 | ||
11190 | /* To be done for ARMv5 and later; as of now we return -1. */ | |
11191 | if (-1 == ret) | |
11192 | printf_unfiltered (_("Process record does not support instruction x%0x " | |
11193 | "at address %s.\n"),arm_insn_r->arm_insn, | |
11194 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11195 | ||
11196 | ||
11197 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11198 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11199 | ||
11200 | return ret; | |
11201 | } | |
11202 | ||
11203 | /* Handling opcode 000 insns. */ | |
11204 | ||
11205 | static int | |
11206 | arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r) | |
11207 | { | |
11208 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11209 | uint32_t record_buf[8], record_buf_mem[8]; | |
11210 | ULONGEST u_regval[2] = {0}; | |
11211 | ||
11212 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
11213 | uint32_t immed_high = 0, immed_low = 0, offset_8 = 0, tgt_mem_addr = 0; | |
11214 | uint32_t opcode1 = 0; | |
11215 | ||
11216 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11217 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11218 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
11219 | ||
11220 | /* Data processing insn /multiply insn. */ | |
11221 | if (9 == arm_insn_r->decode | |
11222 | && ((4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
11223 | || (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode))) | |
11224 | { | |
11225 | /* Handle multiply instructions. */ | |
11226 | /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */ | |
11227 | if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode) | |
11228 | { | |
11229 | /* Handle MLA and MUL. */ | |
11230 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
11231 | record_buf[1] = ARM_PS_REGNUM; | |
11232 | arm_insn_r->reg_rec_count = 2; | |
11233 | } | |
11234 | else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
11235 | { | |
11236 | /* Handle SMLAL, SMULL, UMLAL, UMULL. */ | |
11237 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
11238 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
11239 | record_buf[2] = ARM_PS_REGNUM; | |
11240 | arm_insn_r->reg_rec_count = 3; | |
11241 | } | |
11242 | } | |
11243 | else if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
11244 | && (11 == arm_insn_r->decode || 13 == arm_insn_r->decode)) | |
11245 | { | |
11246 | /* Handle misc load insns, as 20th bit (L = 1). */ | |
11247 | /* LDR insn has a capability to do branching, if | |
11248 | MOV LR, PC is precceded by LDR insn having Rn as R15 | |
11249 | in that case, it emulates branch and link insn, and hence we | |
11250 | need to save CSPR and PC as well. I am not sure this is right | |
11251 | place; as opcode = 010 LDR insn make this happen, if R15 was | |
11252 | used. */ | |
11253 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11254 | if (15 != reg_dest) | |
11255 | { | |
11256 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11257 | arm_insn_r->reg_rec_count = 1; | |
11258 | } | |
11259 | else | |
11260 | { | |
11261 | record_buf[0] = reg_dest; | |
11262 | record_buf[1] = ARM_PS_REGNUM; | |
11263 | arm_insn_r->reg_rec_count = 2; | |
11264 | } | |
11265 | } | |
11266 | else if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
11267 | && sbo_sbz (arm_insn_r->arm_insn, 5, 12, 0) | |
11268 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
11269 | && 2 == bits (arm_insn_r->arm_insn, 20, 21)) | |
11270 | { | |
11271 | /* Handle MSR insn. */ | |
11272 | if (9 == arm_insn_r->opcode) | |
11273 | { | |
11274 | /* CSPR is going to be changed. */ | |
11275 | record_buf[0] = ARM_PS_REGNUM; | |
11276 | arm_insn_r->reg_rec_count = 1; | |
11277 | } | |
11278 | else | |
11279 | { | |
11280 | /* SPSR is going to be changed. */ | |
11281 | /* How to read SPSR value? */ | |
11282 | printf_unfiltered (_("Process record does not support instruction " | |
11283 | "0x%0x at address %s.\n"), | |
11284 | arm_insn_r->arm_insn, | |
11285 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11286 | return -1; | |
11287 | } | |
11288 | } | |
11289 | else if (9 == arm_insn_r->decode | |
11290 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
11291 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11292 | { | |
11293 | /* Handling SWP, SWPB. */ | |
11294 | /* These insn, changes register and memory as well. */ | |
11295 | /* SWP or SWPB insn. */ | |
11296 | ||
11297 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11298 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11299 | /* SWP insn ?, swaps word. */ | |
11300 | if (8 == arm_insn_r->opcode) | |
11301 | { | |
11302 | record_buf_mem[0] = 4; | |
11303 | } | |
11304 | else | |
11305 | { | |
11306 | /* SWPB insn, swaps only byte. */ | |
11307 | record_buf_mem[0] = 1; | |
11308 | } | |
11309 | record_buf_mem[1] = u_regval[0]; | |
11310 | arm_insn_r->mem_rec_count = 1; | |
11311 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11312 | arm_insn_r->reg_rec_count = 1; | |
11313 | } | |
11314 | else if (3 == arm_insn_r->decode && 0x12 == opcode1 | |
11315 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
11316 | { | |
11317 | /* Handle BLX, branch and link/exchange. */ | |
11318 | if (9 == arm_insn_r->opcode) | |
11319 | { | |
11320 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm, | |
11321 | and R14 stores the return address. */ | |
11322 | record_buf[0] = ARM_PS_REGNUM; | |
11323 | record_buf[1] = ARM_LR_REGNUM; | |
11324 | arm_insn_r->reg_rec_count = 2; | |
11325 | } | |
11326 | } | |
11327 | else if (7 == arm_insn_r->decode && 0x12 == opcode1) | |
11328 | { | |
11329 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
11330 | /* CPSR is changed to be executed in ARM state, disabling normal | |
11331 | interrupts, entering abort mode. */ | |
11332 | /* According to high vector configuration PC is set. */ | |
11333 | /* user hit breakpoint and type reverse, in | |
11334 | that case, we need to go back with previous CPSR and | |
11335 | Program Counter. */ | |
11336 | record_buf[0] = ARM_PS_REGNUM; | |
11337 | record_buf[1] = ARM_LR_REGNUM; | |
11338 | arm_insn_r->reg_rec_count = 2; | |
11339 | ||
11340 | /* Save SPSR also; how? */ | |
11341 | printf_unfiltered (_("Process record does not support instruction " | |
11342 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11343 | paddress (arm_insn_r->gdbarch, | |
11344 | arm_insn_r->this_addr)); | |
11345 | return -1; | |
11346 | } | |
11347 | else if (11 == arm_insn_r->decode | |
11348 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11349 | { | |
11350 | /* Handle enhanced store insns and DSP insns (e.g. LDRD). */ | |
11351 | ||
11352 | /* Handle str(x) insn */ | |
11353 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11354 | ARM_RECORD_STRH); | |
11355 | } | |
11356 | else if (1 == arm_insn_r->decode && 0x12 == opcode1 | |
11357 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
11358 | { | |
11359 | /* Handle BX, branch and link/exchange. */ | |
11360 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */ | |
11361 | record_buf[0] = ARM_PS_REGNUM; | |
11362 | arm_insn_r->reg_rec_count = 1; | |
11363 | } | |
11364 | else if (1 == arm_insn_r->decode && 0x16 == opcode1 | |
11365 | && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1) | |
11366 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)) | |
11367 | { | |
11368 | /* Count leading zeros: CLZ. */ | |
11369 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11370 | arm_insn_r->reg_rec_count = 1; | |
11371 | } | |
11372 | else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
11373 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
11374 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1) | |
11375 | && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0) | |
11376 | ) | |
11377 | { | |
11378 | /* Handle MRS insn. */ | |
11379 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11380 | arm_insn_r->reg_rec_count = 1; | |
11381 | } | |
11382 | else if (arm_insn_r->opcode <= 15) | |
11383 | { | |
11384 | /* Normal data processing insns. */ | |
11385 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
11386 | register, which is specified by 13-16 decode. */ | |
11387 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11388 | record_buf[1] = ARM_PS_REGNUM; | |
11389 | arm_insn_r->reg_rec_count = 2; | |
11390 | } | |
11391 | else | |
11392 | { | |
11393 | return -1; | |
11394 | } | |
11395 | ||
11396 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11397 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11398 | return 0; | |
11399 | } | |
11400 | ||
11401 | /* Handling opcode 001 insns. */ | |
11402 | ||
11403 | static int | |
11404 | arm_record_data_proc_imm (insn_decode_record *arm_insn_r) | |
11405 | { | |
11406 | uint32_t record_buf[8], record_buf_mem[8]; | |
11407 | ||
11408 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11409 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11410 | ||
11411 | if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
11412 | && 2 == bits (arm_insn_r->arm_insn, 20, 21) | |
11413 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
11414 | ) | |
11415 | { | |
11416 | /* Handle MSR insn. */ | |
11417 | if (9 == arm_insn_r->opcode) | |
11418 | { | |
11419 | /* CSPR is going to be changed. */ | |
11420 | record_buf[0] = ARM_PS_REGNUM; | |
11421 | arm_insn_r->reg_rec_count = 1; | |
11422 | } | |
11423 | else | |
11424 | { | |
11425 | /* SPSR is going to be changed. */ | |
11426 | } | |
11427 | } | |
11428 | else if (arm_insn_r->opcode <= 15) | |
11429 | { | |
11430 | /* Normal data processing insns. */ | |
11431 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
11432 | register, which is specified by 13-16 decode. */ | |
11433 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11434 | record_buf[1] = ARM_PS_REGNUM; | |
11435 | arm_insn_r->reg_rec_count = 2; | |
11436 | } | |
11437 | else | |
11438 | { | |
11439 | return -1; | |
11440 | } | |
11441 | ||
11442 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11443 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11444 | return 0; | |
11445 | } | |
11446 | ||
11447 | /* Handling opcode 010 insns. */ | |
11448 | ||
11449 | static int | |
11450 | arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r) | |
11451 | { | |
11452 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11453 | ||
11454 | uint32_t reg_src1 = 0 , reg_dest = 0; | |
11455 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
11456 | uint32_t record_buf[8], record_buf_mem[8]; | |
11457 | ||
11458 | ULONGEST u_regval = 0; | |
11459 | ||
11460 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11461 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11462 | ||
11463 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11464 | { | |
11465 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11466 | /* LDR insn has a capability to do branching, if | |
11467 | MOV LR, PC is precedded by LDR insn having Rn as R15 | |
11468 | in that case, it emulates branch and link insn, and hence we | |
11469 | need to save CSPR and PC as well. */ | |
11470 | if (ARM_PC_REGNUM != reg_dest) | |
11471 | { | |
11472 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11473 | arm_insn_r->reg_rec_count = 1; | |
11474 | } | |
11475 | else | |
11476 | { | |
11477 | record_buf[0] = reg_dest; | |
11478 | record_buf[1] = ARM_PS_REGNUM; | |
11479 | arm_insn_r->reg_rec_count = 2; | |
11480 | } | |
11481 | } | |
11482 | else | |
11483 | { | |
11484 | /* Store, immediate offset, immediate pre-indexed, | |
11485 | immediate post-indexed. */ | |
11486 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11487 | offset_12 = bits (arm_insn_r->arm_insn, 0, 11); | |
11488 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11489 | /* U == 1 */ | |
11490 | if (bit (arm_insn_r->arm_insn, 23)) | |
11491 | { | |
11492 | tgt_mem_addr = u_regval + offset_12; | |
11493 | } | |
11494 | else | |
11495 | { | |
11496 | tgt_mem_addr = u_regval - offset_12; | |
11497 | } | |
11498 | ||
11499 | switch (arm_insn_r->opcode) | |
11500 | { | |
11501 | /* STR. */ | |
11502 | case 8: | |
11503 | case 12: | |
11504 | /* STR. */ | |
11505 | case 9: | |
11506 | case 13: | |
11507 | /* STRT. */ | |
11508 | case 1: | |
11509 | case 5: | |
11510 | /* STR. */ | |
11511 | case 4: | |
11512 | case 0: | |
11513 | record_buf_mem[0] = 4; | |
11514 | break; | |
11515 | ||
11516 | /* STRB. */ | |
11517 | case 10: | |
11518 | case 14: | |
11519 | /* STRB. */ | |
11520 | case 11: | |
11521 | case 15: | |
11522 | /* STRBT. */ | |
11523 | case 3: | |
11524 | case 7: | |
11525 | /* STRB. */ | |
11526 | case 2: | |
11527 | case 6: | |
11528 | record_buf_mem[0] = 1; | |
11529 | break; | |
11530 | ||
11531 | default: | |
11532 | gdb_assert_not_reached ("no decoding pattern found"); | |
11533 | break; | |
11534 | } | |
11535 | record_buf_mem[1] = tgt_mem_addr; | |
11536 | arm_insn_r->mem_rec_count = 1; | |
11537 | ||
11538 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11539 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11540 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11541 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11542 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11543 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11544 | ) | |
11545 | { | |
11546 | /* We are handling pre-indexed mode; post-indexed mode; | |
11547 | where Rn is going to be changed. */ | |
11548 | record_buf[0] = reg_src1; | |
11549 | arm_insn_r->reg_rec_count = 1; | |
11550 | } | |
11551 | } | |
11552 | ||
11553 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11554 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11555 | return 0; | |
11556 | } | |
11557 | ||
11558 | /* Handling opcode 011 insns. */ | |
11559 | ||
11560 | static int | |
11561 | arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r) | |
11562 | { | |
11563 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11564 | ||
11565 | uint32_t shift_imm = 0; | |
11566 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
11567 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
11568 | uint32_t record_buf[8], record_buf_mem[8]; | |
11569 | ||
11570 | LONGEST s_word; | |
11571 | ULONGEST u_regval[2]; | |
11572 | ||
11573 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11574 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11575 | ||
11576 | /* Handle enhanced store insns and LDRD DSP insn, | |
11577 | order begins according to addressing modes for store insns | |
11578 | STRH insn. */ | |
11579 | ||
11580 | /* LDR or STR? */ | |
11581 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11582 | { | |
11583 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11584 | /* LDR insn has a capability to do branching, if | |
11585 | MOV LR, PC is precedded by LDR insn having Rn as R15 | |
11586 | in that case, it emulates branch and link insn, and hence we | |
11587 | need to save CSPR and PC as well. */ | |
11588 | if (15 != reg_dest) | |
11589 | { | |
11590 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11591 | arm_insn_r->reg_rec_count = 1; | |
11592 | } | |
11593 | else | |
11594 | { | |
11595 | record_buf[0] = reg_dest; | |
11596 | record_buf[1] = ARM_PS_REGNUM; | |
11597 | arm_insn_r->reg_rec_count = 2; | |
11598 | } | |
11599 | } | |
11600 | else | |
11601 | { | |
11602 | if (! bits (arm_insn_r->arm_insn, 4, 11)) | |
11603 | { | |
11604 | /* Store insn, register offset and register pre-indexed, | |
11605 | register post-indexed. */ | |
11606 | /* Get Rm. */ | |
11607 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
11608 | /* Get Rn. */ | |
11609 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11610 | regcache_raw_read_unsigned (reg_cache, reg_src1 | |
11611 | , &u_regval[0]); | |
11612 | regcache_raw_read_unsigned (reg_cache, reg_src2 | |
11613 | , &u_regval[1]); | |
11614 | if (15 == reg_src2) | |
11615 | { | |
11616 | /* If R15 was used as Rn, hence current PC+8. */ | |
11617 | /* Pre-indexed mode doesnt reach here ; illegal insn. */ | |
11618 | u_regval[0] = u_regval[0] + 8; | |
11619 | } | |
11620 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
11621 | /* U == 1. */ | |
11622 | if (bit (arm_insn_r->arm_insn, 23)) | |
11623 | { | |
11624 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
11625 | } | |
11626 | else | |
11627 | { | |
11628 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
11629 | } | |
11630 | ||
11631 | switch (arm_insn_r->opcode) | |
11632 | { | |
11633 | /* STR. */ | |
11634 | case 8: | |
11635 | case 12: | |
11636 | /* STR. */ | |
11637 | case 9: | |
11638 | case 13: | |
11639 | /* STRT. */ | |
11640 | case 1: | |
11641 | case 5: | |
11642 | /* STR. */ | |
11643 | case 0: | |
11644 | case 4: | |
11645 | record_buf_mem[0] = 4; | |
11646 | break; | |
11647 | ||
11648 | /* STRB. */ | |
11649 | case 10: | |
11650 | case 14: | |
11651 | /* STRB. */ | |
11652 | case 11: | |
11653 | case 15: | |
11654 | /* STRBT. */ | |
11655 | case 3: | |
11656 | case 7: | |
11657 | /* STRB. */ | |
11658 | case 2: | |
11659 | case 6: | |
11660 | record_buf_mem[0] = 1; | |
11661 | break; | |
11662 | ||
11663 | default: | |
11664 | gdb_assert_not_reached ("no decoding pattern found"); | |
11665 | break; | |
11666 | } | |
11667 | record_buf_mem[1] = tgt_mem_addr; | |
11668 | arm_insn_r->mem_rec_count = 1; | |
11669 | ||
11670 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11671 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11672 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11673 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11674 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11675 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11676 | ) | |
11677 | { | |
11678 | /* Rn is going to be changed in pre-indexed mode and | |
11679 | post-indexed mode as well. */ | |
11680 | record_buf[0] = reg_src2; | |
11681 | arm_insn_r->reg_rec_count = 1; | |
11682 | } | |
11683 | } | |
11684 | else | |
11685 | { | |
11686 | /* Store insn, scaled register offset; scaled pre-indexed. */ | |
11687 | offset_12 = bits (arm_insn_r->arm_insn, 5, 6); | |
11688 | /* Get Rm. */ | |
11689 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
11690 | /* Get Rn. */ | |
11691 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11692 | /* Get shift_imm. */ | |
11693 | shift_imm = bits (arm_insn_r->arm_insn, 7, 11); | |
11694 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11695 | regcache_raw_read_signed (reg_cache, reg_src1, &s_word); | |
11696 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
11697 | /* Offset_12 used as shift. */ | |
11698 | switch (offset_12) | |
11699 | { | |
11700 | case 0: | |
11701 | /* Offset_12 used as index. */ | |
11702 | offset_12 = u_regval[0] << shift_imm; | |
11703 | break; | |
11704 | ||
11705 | case 1: | |
11706 | offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm; | |
11707 | break; | |
11708 | ||
11709 | case 2: | |
11710 | if (!shift_imm) | |
11711 | { | |
11712 | if (bit (u_regval[0], 31)) | |
11713 | { | |
11714 | offset_12 = 0xFFFFFFFF; | |
11715 | } | |
11716 | else | |
11717 | { | |
11718 | offset_12 = 0; | |
11719 | } | |
11720 | } | |
11721 | else | |
11722 | { | |
11723 | /* This is arithmetic shift. */ | |
11724 | offset_12 = s_word >> shift_imm; | |
11725 | } | |
11726 | break; | |
11727 | ||
11728 | case 3: | |
11729 | if (!shift_imm) | |
11730 | { | |
11731 | regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM, | |
11732 | &u_regval[1]); | |
11733 | /* Get C flag value and shift it by 31. */ | |
11734 | offset_12 = (((bit (u_regval[1], 29)) << 31) \ | |
11735 | | (u_regval[0]) >> 1); | |
11736 | } | |
11737 | else | |
11738 | { | |
11739 | offset_12 = (u_regval[0] >> shift_imm) \ | |
11740 | | (u_regval[0] << | |
11741 | (sizeof(uint32_t) - shift_imm)); | |
11742 | } | |
11743 | break; | |
11744 | ||
11745 | default: | |
11746 | gdb_assert_not_reached ("no decoding pattern found"); | |
11747 | break; | |
11748 | } | |
11749 | ||
11750 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
11751 | /* bit U set. */ | |
11752 | if (bit (arm_insn_r->arm_insn, 23)) | |
11753 | { | |
11754 | tgt_mem_addr = u_regval[1] + offset_12; | |
11755 | } | |
11756 | else | |
11757 | { | |
11758 | tgt_mem_addr = u_regval[1] - offset_12; | |
11759 | } | |
11760 | ||
11761 | switch (arm_insn_r->opcode) | |
11762 | { | |
11763 | /* STR. */ | |
11764 | case 8: | |
11765 | case 12: | |
11766 | /* STR. */ | |
11767 | case 9: | |
11768 | case 13: | |
11769 | /* STRT. */ | |
11770 | case 1: | |
11771 | case 5: | |
11772 | /* STR. */ | |
11773 | case 0: | |
11774 | case 4: | |
11775 | record_buf_mem[0] = 4; | |
11776 | break; | |
11777 | ||
11778 | /* STRB. */ | |
11779 | case 10: | |
11780 | case 14: | |
11781 | /* STRB. */ | |
11782 | case 11: | |
11783 | case 15: | |
11784 | /* STRBT. */ | |
11785 | case 3: | |
11786 | case 7: | |
11787 | /* STRB. */ | |
11788 | case 2: | |
11789 | case 6: | |
11790 | record_buf_mem[0] = 1; | |
11791 | break; | |
11792 | ||
11793 | default: | |
11794 | gdb_assert_not_reached ("no decoding pattern found"); | |
11795 | break; | |
11796 | } | |
11797 | record_buf_mem[1] = tgt_mem_addr; | |
11798 | arm_insn_r->mem_rec_count = 1; | |
11799 | ||
11800 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11801 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11802 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11803 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11804 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11805 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11806 | ) | |
11807 | { | |
11808 | /* Rn is going to be changed in register scaled pre-indexed | |
11809 | mode,and scaled post indexed mode. */ | |
11810 | record_buf[0] = reg_src2; | |
11811 | arm_insn_r->reg_rec_count = 1; | |
11812 | } | |
11813 | } | |
11814 | } | |
11815 | ||
11816 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11817 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11818 | return 0; | |
11819 | } | |
11820 | ||
11821 | /* Handling opcode 100 insns. */ | |
11822 | ||
11823 | static int | |
11824 | arm_record_ld_st_multiple (insn_decode_record *arm_insn_r) | |
11825 | { | |
11826 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11827 | ||
11828 | uint32_t register_list[16] = {0}, register_count = 0, register_bits = 0; | |
11829 | uint32_t reg_src1 = 0, addr_mode = 0, no_of_regs = 0; | |
11830 | uint32_t start_address = 0, index = 0; | |
11831 | uint32_t record_buf[24], record_buf_mem[48]; | |
11832 | ||
11833 | ULONGEST u_regval[2] = {0}; | |
11834 | ||
11835 | /* This mode is exclusively for load and store multiple. */ | |
11836 | /* Handle incremenrt after/before and decrment after.before mode; | |
11837 | Rn is changing depending on W bit, but as of now we store Rn too | |
11838 | without optimization. */ | |
11839 | ||
11840 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11841 | { | |
11842 | /* LDM (1,2,3) where LDM (3) changes CPSR too. */ | |
11843 | ||
11844 | if (bit (arm_insn_r->arm_insn, 20) && !bit (arm_insn_r->arm_insn, 22)) | |
11845 | { | |
11846 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11847 | no_of_regs = 15; | |
11848 | } | |
11849 | else | |
11850 | { | |
11851 | register_bits = bits (arm_insn_r->arm_insn, 0, 14); | |
11852 | no_of_regs = 14; | |
11853 | } | |
11854 | /* Get Rn. */ | |
11855 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11856 | while (register_bits) | |
11857 | { | |
11858 | if (register_bits & 0x00000001) | |
f969241e | 11859 | record_buf[index++] = register_count; |
72508ac0 | 11860 | register_bits = register_bits >> 1; |
f969241e | 11861 | register_count++; |
72508ac0 PO |
11862 | } |
11863 | ||
11864 | /* Extra space for Base Register and CPSR; wihtout optimization. */ | |
f969241e OJ |
11865 | record_buf[index++] = reg_src1; |
11866 | record_buf[index++] = ARM_PS_REGNUM; | |
11867 | arm_insn_r->reg_rec_count = index; | |
72508ac0 PO |
11868 | } |
11869 | else | |
11870 | { | |
11871 | /* It handles both STM(1) and STM(2). */ | |
11872 | addr_mode = bits (arm_insn_r->arm_insn, 23, 24); | |
11873 | ||
11874 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11875 | /* Get Rn. */ | |
11876 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11877 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11878 | while (register_bits) | |
11879 | { | |
11880 | if (register_bits & 0x00000001) | |
11881 | register_count++; | |
11882 | register_bits = register_bits >> 1; | |
11883 | } | |
11884 | ||
11885 | switch (addr_mode) | |
11886 | { | |
11887 | /* Decrement after. */ | |
11888 | case 0: | |
11889 | start_address = (u_regval[0]) - (register_count * 4) + 4; | |
11890 | arm_insn_r->mem_rec_count = register_count; | |
11891 | while (register_count) | |
11892 | { | |
11893 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11894 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11895 | start_address = start_address + 4; | |
11896 | register_count--; | |
11897 | } | |
11898 | break; | |
11899 | ||
11900 | /* Increment after. */ | |
11901 | case 1: | |
11902 | start_address = u_regval[0]; | |
11903 | arm_insn_r->mem_rec_count = register_count; | |
11904 | while (register_count) | |
11905 | { | |
11906 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11907 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11908 | start_address = start_address + 4; | |
11909 | register_count--; | |
11910 | } | |
11911 | break; | |
11912 | ||
11913 | /* Decrement before. */ | |
11914 | case 2: | |
11915 | ||
11916 | start_address = (u_regval[0]) - (register_count * 4); | |
11917 | arm_insn_r->mem_rec_count = register_count; | |
11918 | while (register_count) | |
11919 | { | |
11920 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11921 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11922 | start_address = start_address + 4; | |
11923 | register_count--; | |
11924 | } | |
11925 | break; | |
11926 | ||
11927 | /* Increment before. */ | |
11928 | case 3: | |
11929 | start_address = u_regval[0] + 4; | |
11930 | arm_insn_r->mem_rec_count = register_count; | |
11931 | while (register_count) | |
11932 | { | |
11933 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11934 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11935 | start_address = start_address + 4; | |
11936 | register_count--; | |
11937 | } | |
11938 | break; | |
11939 | ||
11940 | default: | |
11941 | gdb_assert_not_reached ("no decoding pattern found"); | |
11942 | break; | |
11943 | } | |
11944 | ||
11945 | /* Base register also changes; based on condition and W bit. */ | |
11946 | /* We save it anyway without optimization. */ | |
11947 | record_buf[0] = reg_src1; | |
11948 | arm_insn_r->reg_rec_count = 1; | |
11949 | } | |
11950 | ||
11951 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11952 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11953 | return 0; | |
11954 | } | |
11955 | ||
11956 | /* Handling opcode 101 insns. */ | |
11957 | ||
11958 | static int | |
11959 | arm_record_b_bl (insn_decode_record *arm_insn_r) | |
11960 | { | |
11961 | uint32_t record_buf[8]; | |
11962 | ||
11963 | /* Handle B, BL, BLX(1) insns. */ | |
11964 | /* B simply branches so we do nothing here. */ | |
11965 | /* Note: BLX(1) doesnt fall here but instead it falls into | |
11966 | extension space. */ | |
11967 | if (bit (arm_insn_r->arm_insn, 24)) | |
11968 | { | |
11969 | record_buf[0] = ARM_LR_REGNUM; | |
11970 | arm_insn_r->reg_rec_count = 1; | |
11971 | } | |
11972 | ||
11973 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11974 | ||
11975 | return 0; | |
11976 | } | |
11977 | ||
11978 | /* Handling opcode 110 insns. */ | |
11979 | ||
11980 | static int | |
c6ec2b30 | 11981 | arm_record_unsupported_insn (insn_decode_record *arm_insn_r) |
72508ac0 PO |
11982 | { |
11983 | printf_unfiltered (_("Process record does not support instruction " | |
11984 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11985 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11986 | ||
11987 | return -1; | |
11988 | } | |
11989 | ||
11990 | /* Handling opcode 111 insns. */ | |
11991 | ||
11992 | static int | |
11993 | arm_record_coproc_data_proc (insn_decode_record *arm_insn_r) | |
11994 | { | |
11995 | struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch); | |
11996 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11997 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
97dfe206 | 11998 | ULONGEST u_regval = 0; |
72508ac0 PO |
11999 | |
12000 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27); | |
97dfe206 OJ |
12001 | |
12002 | /* Handle arm SWI/SVC system call instructions. */ | |
72508ac0 | 12003 | if (15 == arm_insn_r->opcode) |
97dfe206 OJ |
12004 | { |
12005 | if (tdep->arm_syscall_record != NULL) | |
12006 | { | |
12007 | ULONGEST svc_operand, svc_number; | |
12008 | ||
12009 | svc_operand = (0x00ffffff & arm_insn_r->arm_insn); | |
12010 | ||
12011 | if (svc_operand) /* OABI. */ | |
12012 | svc_number = svc_operand - 0x900000; | |
12013 | else /* EABI. */ | |
12014 | regcache_raw_read_unsigned (reg_cache, 7, &svc_number); | |
12015 | ||
12016 | ret = tdep->arm_syscall_record (reg_cache, svc_number); | |
12017 | } | |
12018 | else | |
12019 | { | |
12020 | printf_unfiltered (_("no syscall record support\n")); | |
12021 | ret = -1; | |
12022 | } | |
12023 | } | |
12024 | else | |
12025 | { | |
12026 | arm_record_unsupported_insn (arm_insn_r); | |
12027 | ret = -1; | |
12028 | } | |
72508ac0 | 12029 | |
72508ac0 PO |
12030 | return ret; |
12031 | } | |
12032 | ||
12033 | /* Handling opcode 000 insns. */ | |
12034 | ||
12035 | static int | |
12036 | thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r) | |
12037 | { | |
12038 | uint32_t record_buf[8]; | |
12039 | uint32_t reg_src1 = 0; | |
12040 | ||
12041 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12042 | ||
12043 | record_buf[0] = ARM_PS_REGNUM; | |
12044 | record_buf[1] = reg_src1; | |
12045 | thumb_insn_r->reg_rec_count = 2; | |
12046 | ||
12047 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12048 | ||
12049 | return 0; | |
12050 | } | |
12051 | ||
12052 | ||
12053 | /* Handling opcode 001 insns. */ | |
12054 | ||
12055 | static int | |
12056 | thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r) | |
12057 | { | |
12058 | uint32_t record_buf[8]; | |
12059 | uint32_t reg_src1 = 0; | |
12060 | ||
12061 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12062 | ||
12063 | record_buf[0] = ARM_PS_REGNUM; | |
12064 | record_buf[1] = reg_src1; | |
12065 | thumb_insn_r->reg_rec_count = 2; | |
12066 | ||
12067 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12068 | ||
12069 | return 0; | |
12070 | } | |
12071 | ||
12072 | /* Handling opcode 010 insns. */ | |
12073 | ||
12074 | static int | |
12075 | thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r) | |
12076 | { | |
12077 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12078 | uint32_t record_buf[8], record_buf_mem[8]; | |
12079 | ||
12080 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
12081 | uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0; | |
12082 | ||
12083 | ULONGEST u_regval[2] = {0}; | |
12084 | ||
12085 | opcode1 = bits (thumb_insn_r->arm_insn, 10, 12); | |
12086 | ||
12087 | if (bit (thumb_insn_r->arm_insn, 12)) | |
12088 | { | |
12089 | /* Handle load/store register offset. */ | |
12090 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 10); | |
12091 | if (opcode2 >= 12 && opcode2 <= 15) | |
12092 | { | |
12093 | /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */ | |
12094 | reg_src1 = bits (thumb_insn_r->arm_insn,0, 2); | |
12095 | record_buf[0] = reg_src1; | |
12096 | thumb_insn_r->reg_rec_count = 1; | |
12097 | } | |
12098 | else if (opcode2 >= 8 && opcode2 <= 10) | |
12099 | { | |
12100 | /* STR(2), STRB(2), STRH(2) . */ | |
12101 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12102 | reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8); | |
12103 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
12104 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
12105 | if (8 == opcode2) | |
12106 | record_buf_mem[0] = 4; /* STR (2). */ | |
12107 | else if (10 == opcode2) | |
12108 | record_buf_mem[0] = 1; /* STRB (2). */ | |
12109 | else if (9 == opcode2) | |
12110 | record_buf_mem[0] = 2; /* STRH (2). */ | |
12111 | record_buf_mem[1] = u_regval[0] + u_regval[1]; | |
12112 | thumb_insn_r->mem_rec_count = 1; | |
12113 | } | |
12114 | } | |
12115 | else if (bit (thumb_insn_r->arm_insn, 11)) | |
12116 | { | |
12117 | /* Handle load from literal pool. */ | |
12118 | /* LDR(3). */ | |
12119 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12120 | record_buf[0] = reg_src1; | |
12121 | thumb_insn_r->reg_rec_count = 1; | |
12122 | } | |
12123 | else if (opcode1) | |
12124 | { | |
12125 | opcode2 = bits (thumb_insn_r->arm_insn, 8, 9); | |
12126 | opcode3 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12127 | if ((3 == opcode2) && (!opcode3)) | |
12128 | { | |
12129 | /* Branch with exchange. */ | |
12130 | record_buf[0] = ARM_PS_REGNUM; | |
12131 | thumb_insn_r->reg_rec_count = 1; | |
12132 | } | |
12133 | else | |
12134 | { | |
12135 | /* Format 8; special data processing insns. */ | |
12136 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12137 | record_buf[0] = ARM_PS_REGNUM; | |
12138 | record_buf[1] = reg_src1; | |
12139 | thumb_insn_r->reg_rec_count = 2; | |
12140 | } | |
12141 | } | |
12142 | else | |
12143 | { | |
12144 | /* Format 5; data processing insns. */ | |
12145 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12146 | if (bit (thumb_insn_r->arm_insn, 7)) | |
12147 | { | |
12148 | reg_src1 = reg_src1 + 8; | |
12149 | } | |
12150 | record_buf[0] = ARM_PS_REGNUM; | |
12151 | record_buf[1] = reg_src1; | |
12152 | thumb_insn_r->reg_rec_count = 2; | |
12153 | } | |
12154 | ||
12155 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12156 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12157 | record_buf_mem); | |
12158 | ||
12159 | return 0; | |
12160 | } | |
12161 | ||
12162 | /* Handling opcode 001 insns. */ | |
12163 | ||
12164 | static int | |
12165 | thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r) | |
12166 | { | |
12167 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12168 | uint32_t record_buf[8], record_buf_mem[8]; | |
12169 | ||
12170 | uint32_t reg_src1 = 0; | |
12171 | uint32_t opcode = 0, immed_5 = 0; | |
12172 | ||
12173 | ULONGEST u_regval = 0; | |
12174 | ||
12175 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12176 | ||
12177 | if (opcode) | |
12178 | { | |
12179 | /* LDR(1). */ | |
12180 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12181 | record_buf[0] = reg_src1; | |
12182 | thumb_insn_r->reg_rec_count = 1; | |
12183 | } | |
12184 | else | |
12185 | { | |
12186 | /* STR(1). */ | |
12187 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12188 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12189 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12190 | record_buf_mem[0] = 4; | |
12191 | record_buf_mem[1] = u_regval + (immed_5 * 4); | |
12192 | thumb_insn_r->mem_rec_count = 1; | |
12193 | } | |
12194 | ||
12195 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12196 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12197 | record_buf_mem); | |
12198 | ||
12199 | return 0; | |
12200 | } | |
12201 | ||
12202 | /* Handling opcode 100 insns. */ | |
12203 | ||
12204 | static int | |
12205 | thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r) | |
12206 | { | |
12207 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12208 | uint32_t record_buf[8], record_buf_mem[8]; | |
12209 | ||
12210 | uint32_t reg_src1 = 0; | |
12211 | uint32_t opcode = 0, immed_8 = 0, immed_5 = 0; | |
12212 | ||
12213 | ULONGEST u_regval = 0; | |
12214 | ||
12215 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12216 | ||
12217 | if (3 == opcode) | |
12218 | { | |
12219 | /* LDR(4). */ | |
12220 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12221 | record_buf[0] = reg_src1; | |
12222 | thumb_insn_r->reg_rec_count = 1; | |
12223 | } | |
12224 | else if (1 == opcode) | |
12225 | { | |
12226 | /* LDRH(1). */ | |
12227 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12228 | record_buf[0] = reg_src1; | |
12229 | thumb_insn_r->reg_rec_count = 1; | |
12230 | } | |
12231 | else if (2 == opcode) | |
12232 | { | |
12233 | /* STR(3). */ | |
12234 | immed_8 = bits (thumb_insn_r->arm_insn, 0, 7); | |
12235 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); | |
12236 | record_buf_mem[0] = 4; | |
12237 | record_buf_mem[1] = u_regval + (immed_8 * 4); | |
12238 | thumb_insn_r->mem_rec_count = 1; | |
12239 | } | |
12240 | else if (0 == opcode) | |
12241 | { | |
12242 | /* STRH(1). */ | |
12243 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12244 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12245 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12246 | record_buf_mem[0] = 2; | |
12247 | record_buf_mem[1] = u_regval + (immed_5 * 2); | |
12248 | thumb_insn_r->mem_rec_count = 1; | |
12249 | } | |
12250 | ||
12251 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12252 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12253 | record_buf_mem); | |
12254 | ||
12255 | return 0; | |
12256 | } | |
12257 | ||
12258 | /* Handling opcode 101 insns. */ | |
12259 | ||
12260 | static int | |
12261 | thumb_record_misc (insn_decode_record *thumb_insn_r) | |
12262 | { | |
12263 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12264 | ||
12265 | uint32_t opcode = 0, opcode1 = 0, opcode2 = 0; | |
12266 | uint32_t register_bits = 0, register_count = 0; | |
12267 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; | |
12268 | uint32_t record_buf[24], record_buf_mem[48]; | |
12269 | uint32_t reg_src1; | |
12270 | ||
12271 | ULONGEST u_regval = 0; | |
12272 | ||
12273 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12274 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12275 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 12); | |
12276 | ||
12277 | if (14 == opcode2) | |
12278 | { | |
12279 | /* POP. */ | |
12280 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12281 | while (register_bits) | |
f969241e OJ |
12282 | { |
12283 | if (register_bits & 0x00000001) | |
12284 | record_buf[index++] = register_count; | |
12285 | register_bits = register_bits >> 1; | |
12286 | register_count++; | |
12287 | } | |
12288 | record_buf[index++] = ARM_PS_REGNUM; | |
12289 | record_buf[index++] = ARM_SP_REGNUM; | |
12290 | thumb_insn_r->reg_rec_count = index; | |
72508ac0 PO |
12291 | } |
12292 | else if (10 == opcode2) | |
12293 | { | |
12294 | /* PUSH. */ | |
12295 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
9904a494 | 12296 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); |
72508ac0 PO |
12297 | while (register_bits) |
12298 | { | |
12299 | if (register_bits & 0x00000001) | |
12300 | register_count++; | |
12301 | register_bits = register_bits >> 1; | |
12302 | } | |
12303 | start_address = u_regval - \ | |
12304 | (4 * (bit (thumb_insn_r->arm_insn, 8) + register_count)); | |
12305 | thumb_insn_r->mem_rec_count = register_count; | |
12306 | while (register_count) | |
12307 | { | |
12308 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12309 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12310 | start_address = start_address + 4; | |
12311 | register_count--; | |
12312 | } | |
12313 | record_buf[0] = ARM_SP_REGNUM; | |
12314 | thumb_insn_r->reg_rec_count = 1; | |
12315 | } | |
12316 | else if (0x1E == opcode1) | |
12317 | { | |
12318 | /* BKPT insn. */ | |
12319 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
12320 | /* CPSR is changed to be executed in ARM state, disabling normal | |
12321 | interrupts, entering abort mode. */ | |
12322 | /* According to high vector configuration PC is set. */ | |
12323 | /* User hits breakpoint and type reverse, in that case, we need to go back with | |
12324 | previous CPSR and Program Counter. */ | |
12325 | record_buf[0] = ARM_PS_REGNUM; | |
12326 | record_buf[1] = ARM_LR_REGNUM; | |
12327 | thumb_insn_r->reg_rec_count = 2; | |
12328 | /* We need to save SPSR value, which is not yet done. */ | |
12329 | printf_unfiltered (_("Process record does not support instruction " | |
12330 | "0x%0x at address %s.\n"), | |
12331 | thumb_insn_r->arm_insn, | |
12332 | paddress (thumb_insn_r->gdbarch, | |
12333 | thumb_insn_r->this_addr)); | |
12334 | return -1; | |
12335 | } | |
12336 | else if ((0 == opcode) || (1 == opcode)) | |
12337 | { | |
12338 | /* ADD(5), ADD(6). */ | |
12339 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12340 | record_buf[0] = reg_src1; | |
12341 | thumb_insn_r->reg_rec_count = 1; | |
12342 | } | |
12343 | else if (2 == opcode) | |
12344 | { | |
12345 | /* ADD(7), SUB(4). */ | |
12346 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12347 | record_buf[0] = ARM_SP_REGNUM; | |
12348 | thumb_insn_r->reg_rec_count = 1; | |
12349 | } | |
12350 | ||
12351 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12352 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12353 | record_buf_mem); | |
12354 | ||
12355 | return 0; | |
12356 | } | |
12357 | ||
12358 | /* Handling opcode 110 insns. */ | |
12359 | ||
12360 | static int | |
12361 | thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r) | |
12362 | { | |
12363 | struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch); | |
12364 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12365 | ||
12366 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
12367 | uint32_t reg_src1 = 0; | |
12368 | uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count = 0; | |
12369 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; | |
12370 | uint32_t record_buf[24], record_buf_mem[48]; | |
12371 | ||
12372 | ULONGEST u_regval = 0; | |
12373 | ||
12374 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12375 | opcode2 = bits (thumb_insn_r->arm_insn, 11, 12); | |
12376 | ||
12377 | if (1 == opcode2) | |
12378 | { | |
12379 | ||
12380 | /* LDMIA. */ | |
12381 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12382 | /* Get Rn. */ | |
12383 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12384 | while (register_bits) | |
12385 | { | |
12386 | if (register_bits & 0x00000001) | |
f969241e | 12387 | record_buf[index++] = register_count; |
72508ac0 | 12388 | register_bits = register_bits >> 1; |
f969241e | 12389 | register_count++; |
72508ac0 | 12390 | } |
f969241e OJ |
12391 | record_buf[index++] = reg_src1; |
12392 | thumb_insn_r->reg_rec_count = index; | |
72508ac0 PO |
12393 | } |
12394 | else if (0 == opcode2) | |
12395 | { | |
12396 | /* It handles both STMIA. */ | |
12397 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12398 | /* Get Rn. */ | |
12399 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12400 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12401 | while (register_bits) | |
12402 | { | |
12403 | if (register_bits & 0x00000001) | |
12404 | register_count++; | |
12405 | register_bits = register_bits >> 1; | |
12406 | } | |
12407 | start_address = u_regval; | |
12408 | thumb_insn_r->mem_rec_count = register_count; | |
12409 | while (register_count) | |
12410 | { | |
12411 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12412 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12413 | start_address = start_address + 4; | |
12414 | register_count--; | |
12415 | } | |
12416 | } | |
12417 | else if (0x1F == opcode1) | |
12418 | { | |
12419 | /* Handle arm syscall insn. */ | |
97dfe206 | 12420 | if (tdep->arm_syscall_record != NULL) |
72508ac0 | 12421 | { |
97dfe206 OJ |
12422 | regcache_raw_read_unsigned (reg_cache, 7, &u_regval); |
12423 | ret = tdep->arm_syscall_record (reg_cache, u_regval); | |
72508ac0 PO |
12424 | } |
12425 | else | |
12426 | { | |
12427 | printf_unfiltered (_("no syscall record support\n")); | |
12428 | return -1; | |
12429 | } | |
12430 | } | |
12431 | ||
12432 | /* B (1), conditional branch is automatically taken care in process_record, | |
12433 | as PC is saved there. */ | |
12434 | ||
12435 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12436 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12437 | record_buf_mem); | |
12438 | ||
12439 | return ret; | |
12440 | } | |
12441 | ||
12442 | /* Handling opcode 111 insns. */ | |
12443 | ||
12444 | static int | |
12445 | thumb_record_branch (insn_decode_record *thumb_insn_r) | |
12446 | { | |
12447 | uint32_t record_buf[8]; | |
12448 | uint32_t bits_h = 0; | |
12449 | ||
12450 | bits_h = bits (thumb_insn_r->arm_insn, 11, 12); | |
12451 | ||
12452 | if (2 == bits_h || 3 == bits_h) | |
12453 | { | |
12454 | /* BL */ | |
12455 | record_buf[0] = ARM_LR_REGNUM; | |
12456 | thumb_insn_r->reg_rec_count = 1; | |
12457 | } | |
12458 | else if (1 == bits_h) | |
12459 | { | |
12460 | /* BLX(1). */ | |
12461 | record_buf[0] = ARM_PS_REGNUM; | |
12462 | record_buf[1] = ARM_LR_REGNUM; | |
12463 | thumb_insn_r->reg_rec_count = 2; | |
12464 | } | |
12465 | ||
12466 | /* B(2) is automatically taken care in process_record, as PC is | |
12467 | saved there. */ | |
12468 | ||
12469 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12470 | ||
12471 | return 0; | |
12472 | } | |
12473 | ||
c6ec2b30 OJ |
12474 | /* Handler for thumb2 load/store multiple instructions. */ |
12475 | ||
12476 | static int | |
12477 | thumb2_record_ld_st_multiple (insn_decode_record *thumb2_insn_r) | |
12478 | { | |
12479 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12480 | ||
12481 | uint32_t reg_rn, op; | |
12482 | uint32_t register_bits = 0, register_count = 0; | |
12483 | uint32_t index = 0, start_address = 0; | |
12484 | uint32_t record_buf[24], record_buf_mem[48]; | |
12485 | ||
12486 | ULONGEST u_regval = 0; | |
12487 | ||
12488 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12489 | op = bits (thumb2_insn_r->arm_insn, 23, 24); | |
12490 | ||
12491 | if (0 == op || 3 == op) | |
12492 | { | |
12493 | if (bit (thumb2_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
12494 | { | |
12495 | /* Handle RFE instruction. */ | |
12496 | record_buf[0] = ARM_PS_REGNUM; | |
12497 | thumb2_insn_r->reg_rec_count = 1; | |
12498 | } | |
12499 | else | |
12500 | { | |
12501 | /* Handle SRS instruction after reading banked SP. */ | |
12502 | return arm_record_unsupported_insn (thumb2_insn_r); | |
12503 | } | |
12504 | } | |
12505 | else if (1 == op || 2 == op) | |
12506 | { | |
12507 | if (bit (thumb2_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
12508 | { | |
12509 | /* Handle LDM/LDMIA/LDMFD and LDMDB/LDMEA instructions. */ | |
12510 | register_bits = bits (thumb2_insn_r->arm_insn, 0, 15); | |
12511 | while (register_bits) | |
12512 | { | |
12513 | if (register_bits & 0x00000001) | |
12514 | record_buf[index++] = register_count; | |
12515 | ||
12516 | register_count++; | |
12517 | register_bits = register_bits >> 1; | |
12518 | } | |
12519 | record_buf[index++] = reg_rn; | |
12520 | record_buf[index++] = ARM_PS_REGNUM; | |
12521 | thumb2_insn_r->reg_rec_count = index; | |
12522 | } | |
12523 | else | |
12524 | { | |
12525 | /* Handle STM/STMIA/STMEA and STMDB/STMFD. */ | |
12526 | register_bits = bits (thumb2_insn_r->arm_insn, 0, 15); | |
12527 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval); | |
12528 | while (register_bits) | |
12529 | { | |
12530 | if (register_bits & 0x00000001) | |
12531 | register_count++; | |
12532 | ||
12533 | register_bits = register_bits >> 1; | |
12534 | } | |
12535 | ||
12536 | if (1 == op) | |
12537 | { | |
12538 | /* Start address calculation for LDMDB/LDMEA. */ | |
12539 | start_address = u_regval; | |
12540 | } | |
12541 | else if (2 == op) | |
12542 | { | |
12543 | /* Start address calculation for LDMDB/LDMEA. */ | |
12544 | start_address = u_regval - register_count * 4; | |
12545 | } | |
12546 | ||
12547 | thumb2_insn_r->mem_rec_count = register_count; | |
12548 | while (register_count) | |
12549 | { | |
12550 | record_buf_mem[register_count * 2 - 1] = start_address; | |
12551 | record_buf_mem[register_count * 2 - 2] = 4; | |
12552 | start_address = start_address + 4; | |
12553 | register_count--; | |
12554 | } | |
12555 | record_buf[0] = reg_rn; | |
12556 | record_buf[1] = ARM_PS_REGNUM; | |
12557 | thumb2_insn_r->reg_rec_count = 2; | |
12558 | } | |
12559 | } | |
12560 | ||
12561 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12562 | record_buf_mem); | |
12563 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12564 | record_buf); | |
12565 | return ARM_RECORD_SUCCESS; | |
12566 | } | |
12567 | ||
12568 | /* Handler for thumb2 load/store (dual/exclusive) and table branch | |
12569 | instructions. */ | |
12570 | ||
12571 | static int | |
12572 | thumb2_record_ld_st_dual_ex_tbb (insn_decode_record *thumb2_insn_r) | |
12573 | { | |
12574 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12575 | ||
12576 | uint32_t reg_rd, reg_rn, offset_imm; | |
12577 | uint32_t reg_dest1, reg_dest2; | |
12578 | uint32_t address, offset_addr; | |
12579 | uint32_t record_buf[8], record_buf_mem[8]; | |
12580 | uint32_t op1, op2, op3; | |
12581 | LONGEST s_word; | |
12582 | ||
12583 | ULONGEST u_regval[2]; | |
12584 | ||
12585 | op1 = bits (thumb2_insn_r->arm_insn, 23, 24); | |
12586 | op2 = bits (thumb2_insn_r->arm_insn, 20, 21); | |
12587 | op3 = bits (thumb2_insn_r->arm_insn, 4, 7); | |
12588 | ||
12589 | if (bit (thumb2_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
12590 | { | |
12591 | if(!(1 == op1 && 1 == op2 && (0 == op3 || 1 == op3))) | |
12592 | { | |
12593 | reg_dest1 = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12594 | record_buf[0] = reg_dest1; | |
12595 | record_buf[1] = ARM_PS_REGNUM; | |
12596 | thumb2_insn_r->reg_rec_count = 2; | |
12597 | } | |
12598 | ||
12599 | if (3 == op2 || (op1 & 2) || (1 == op1 && 1 == op2 && 7 == op3)) | |
12600 | { | |
12601 | reg_dest2 = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12602 | record_buf[2] = reg_dest2; | |
12603 | thumb2_insn_r->reg_rec_count = 3; | |
12604 | } | |
12605 | } | |
12606 | else | |
12607 | { | |
12608 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12609 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval[0]); | |
12610 | ||
12611 | if (0 == op1 && 0 == op2) | |
12612 | { | |
12613 | /* Handle STREX. */ | |
12614 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 7); | |
12615 | address = u_regval[0] + (offset_imm * 4); | |
12616 | record_buf_mem[0] = 4; | |
12617 | record_buf_mem[1] = address; | |
12618 | thumb2_insn_r->mem_rec_count = 1; | |
12619 | reg_rd = bits (thumb2_insn_r->arm_insn, 0, 3); | |
12620 | record_buf[0] = reg_rd; | |
12621 | thumb2_insn_r->reg_rec_count = 1; | |
12622 | } | |
12623 | else if (1 == op1 && 0 == op2) | |
12624 | { | |
12625 | reg_rd = bits (thumb2_insn_r->arm_insn, 0, 3); | |
12626 | record_buf[0] = reg_rd; | |
12627 | thumb2_insn_r->reg_rec_count = 1; | |
12628 | address = u_regval[0]; | |
12629 | record_buf_mem[1] = address; | |
12630 | ||
12631 | if (4 == op3) | |
12632 | { | |
12633 | /* Handle STREXB. */ | |
12634 | record_buf_mem[0] = 1; | |
12635 | thumb2_insn_r->mem_rec_count = 1; | |
12636 | } | |
12637 | else if (5 == op3) | |
12638 | { | |
12639 | /* Handle STREXH. */ | |
12640 | record_buf_mem[0] = 2 ; | |
12641 | thumb2_insn_r->mem_rec_count = 1; | |
12642 | } | |
12643 | else if (7 == op3) | |
12644 | { | |
12645 | /* Handle STREXD. */ | |
12646 | address = u_regval[0]; | |
12647 | record_buf_mem[0] = 4; | |
12648 | record_buf_mem[2] = 4; | |
12649 | record_buf_mem[3] = address + 4; | |
12650 | thumb2_insn_r->mem_rec_count = 2; | |
12651 | } | |
12652 | } | |
12653 | else | |
12654 | { | |
12655 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 7); | |
12656 | ||
12657 | if (bit (thumb2_insn_r->arm_insn, 24)) | |
12658 | { | |
12659 | if (bit (thumb2_insn_r->arm_insn, 23)) | |
12660 | offset_addr = u_regval[0] + (offset_imm * 4); | |
12661 | else | |
12662 | offset_addr = u_regval[0] - (offset_imm * 4); | |
12663 | ||
12664 | address = offset_addr; | |
12665 | } | |
12666 | else | |
12667 | address = u_regval[0]; | |
12668 | ||
12669 | record_buf_mem[0] = 4; | |
12670 | record_buf_mem[1] = address; | |
12671 | record_buf_mem[2] = 4; | |
12672 | record_buf_mem[3] = address + 4; | |
12673 | thumb2_insn_r->mem_rec_count = 2; | |
12674 | record_buf[0] = reg_rn; | |
12675 | thumb2_insn_r->reg_rec_count = 1; | |
12676 | } | |
12677 | } | |
12678 | ||
12679 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12680 | record_buf); | |
12681 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12682 | record_buf_mem); | |
12683 | return ARM_RECORD_SUCCESS; | |
12684 | } | |
12685 | ||
12686 | /* Handler for thumb2 data processing (shift register and modified immediate) | |
12687 | instructions. */ | |
12688 | ||
12689 | static int | |
12690 | thumb2_record_data_proc_sreg_mimm (insn_decode_record *thumb2_insn_r) | |
12691 | { | |
12692 | uint32_t reg_rd, op; | |
12693 | uint32_t record_buf[8]; | |
12694 | ||
12695 | op = bits (thumb2_insn_r->arm_insn, 21, 24); | |
12696 | reg_rd = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12697 | ||
12698 | if ((0 == op || 4 == op || 8 == op || 13 == op) && 15 == reg_rd) | |
12699 | { | |
12700 | record_buf[0] = ARM_PS_REGNUM; | |
12701 | thumb2_insn_r->reg_rec_count = 1; | |
12702 | } | |
12703 | else | |
12704 | { | |
12705 | record_buf[0] = reg_rd; | |
12706 | record_buf[1] = ARM_PS_REGNUM; | |
12707 | thumb2_insn_r->reg_rec_count = 2; | |
12708 | } | |
12709 | ||
12710 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12711 | record_buf); | |
12712 | return ARM_RECORD_SUCCESS; | |
12713 | } | |
12714 | ||
12715 | /* Generic handler for thumb2 instructions which effect destination and PS | |
12716 | registers. */ | |
12717 | ||
12718 | static int | |
12719 | thumb2_record_ps_dest_generic (insn_decode_record *thumb2_insn_r) | |
12720 | { | |
12721 | uint32_t reg_rd; | |
12722 | uint32_t record_buf[8]; | |
12723 | ||
12724 | reg_rd = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12725 | ||
12726 | record_buf[0] = reg_rd; | |
12727 | record_buf[1] = ARM_PS_REGNUM; | |
12728 | thumb2_insn_r->reg_rec_count = 2; | |
12729 | ||
12730 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12731 | record_buf); | |
12732 | return ARM_RECORD_SUCCESS; | |
12733 | } | |
12734 | ||
12735 | /* Handler for thumb2 branch and miscellaneous control instructions. */ | |
12736 | ||
12737 | static int | |
12738 | thumb2_record_branch_misc_cntrl (insn_decode_record *thumb2_insn_r) | |
12739 | { | |
12740 | uint32_t op, op1, op2; | |
12741 | uint32_t record_buf[8]; | |
12742 | ||
12743 | op = bits (thumb2_insn_r->arm_insn, 20, 26); | |
12744 | op1 = bits (thumb2_insn_r->arm_insn, 12, 14); | |
12745 | op2 = bits (thumb2_insn_r->arm_insn, 8, 11); | |
12746 | ||
12747 | /* Handle MSR insn. */ | |
12748 | if (!(op1 & 0x2) && 0x38 == op) | |
12749 | { | |
12750 | if (!(op2 & 0x3)) | |
12751 | { | |
12752 | /* CPSR is going to be changed. */ | |
12753 | record_buf[0] = ARM_PS_REGNUM; | |
12754 | thumb2_insn_r->reg_rec_count = 1; | |
12755 | } | |
12756 | else | |
12757 | { | |
12758 | arm_record_unsupported_insn(thumb2_insn_r); | |
12759 | return -1; | |
12760 | } | |
12761 | } | |
12762 | else if (4 == (op1 & 0x5) || 5 == (op1 & 0x5)) | |
12763 | { | |
12764 | /* BLX. */ | |
12765 | record_buf[0] = ARM_PS_REGNUM; | |
12766 | record_buf[1] = ARM_LR_REGNUM; | |
12767 | thumb2_insn_r->reg_rec_count = 2; | |
12768 | } | |
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 | ||
12775 | /* Handler for thumb2 store single data item instructions. */ | |
12776 | ||
12777 | static int | |
12778 | thumb2_record_str_single_data (insn_decode_record *thumb2_insn_r) | |
12779 | { | |
12780 | struct regcache *reg_cache = thumb2_insn_r->regcache; | |
12781 | ||
12782 | uint32_t reg_rn, reg_rm, offset_imm, shift_imm; | |
12783 | uint32_t address, offset_addr; | |
12784 | uint32_t record_buf[8], record_buf_mem[8]; | |
12785 | uint32_t op1, op2; | |
12786 | ||
12787 | ULONGEST u_regval[2]; | |
12788 | ||
12789 | op1 = bits (thumb2_insn_r->arm_insn, 21, 23); | |
12790 | op2 = bits (thumb2_insn_r->arm_insn, 6, 11); | |
12791 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12792 | regcache_raw_read_unsigned (reg_cache, reg_rn, &u_regval[0]); | |
12793 | ||
12794 | if (bit (thumb2_insn_r->arm_insn, 23)) | |
12795 | { | |
12796 | /* T2 encoding. */ | |
12797 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 11); | |
12798 | offset_addr = u_regval[0] + offset_imm; | |
12799 | address = offset_addr; | |
12800 | } | |
12801 | else | |
12802 | { | |
12803 | /* T3 encoding. */ | |
12804 | if ((0 == op1 || 1 == op1 || 2 == op1) && !(op2 & 0x20)) | |
12805 | { | |
12806 | /* Handle STRB (register). */ | |
12807 | reg_rm = bits (thumb2_insn_r->arm_insn, 0, 3); | |
12808 | regcache_raw_read_unsigned (reg_cache, reg_rm, &u_regval[1]); | |
12809 | shift_imm = bits (thumb2_insn_r->arm_insn, 4, 5); | |
12810 | offset_addr = u_regval[1] << shift_imm; | |
12811 | address = u_regval[0] + offset_addr; | |
12812 | } | |
12813 | else | |
12814 | { | |
12815 | offset_imm = bits (thumb2_insn_r->arm_insn, 0, 7); | |
12816 | if (bit (thumb2_insn_r->arm_insn, 10)) | |
12817 | { | |
12818 | if (bit (thumb2_insn_r->arm_insn, 9)) | |
12819 | offset_addr = u_regval[0] + offset_imm; | |
12820 | else | |
12821 | offset_addr = u_regval[0] - offset_imm; | |
12822 | ||
12823 | address = offset_addr; | |
12824 | } | |
12825 | else | |
12826 | address = u_regval[0]; | |
12827 | } | |
12828 | } | |
12829 | ||
12830 | switch (op1) | |
12831 | { | |
12832 | /* Store byte instructions. */ | |
12833 | case 4: | |
12834 | case 0: | |
12835 | record_buf_mem[0] = 1; | |
12836 | break; | |
12837 | /* Store half word instructions. */ | |
12838 | case 1: | |
12839 | case 5: | |
12840 | record_buf_mem[0] = 2; | |
12841 | break; | |
12842 | /* Store word instructions. */ | |
12843 | case 2: | |
12844 | case 6: | |
12845 | record_buf_mem[0] = 4; | |
12846 | break; | |
12847 | ||
12848 | default: | |
12849 | gdb_assert_not_reached ("no decoding pattern found"); | |
12850 | break; | |
12851 | } | |
12852 | ||
12853 | record_buf_mem[1] = address; | |
12854 | thumb2_insn_r->mem_rec_count = 1; | |
12855 | record_buf[0] = reg_rn; | |
12856 | thumb2_insn_r->reg_rec_count = 1; | |
12857 | ||
12858 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12859 | record_buf); | |
12860 | MEM_ALLOC (thumb2_insn_r->arm_mems, thumb2_insn_r->mem_rec_count, | |
12861 | record_buf_mem); | |
12862 | return ARM_RECORD_SUCCESS; | |
12863 | } | |
12864 | ||
12865 | /* Handler for thumb2 load memory hints instructions. */ | |
12866 | ||
12867 | static int | |
12868 | thumb2_record_ld_mem_hints (insn_decode_record *thumb2_insn_r) | |
12869 | { | |
12870 | uint32_t record_buf[8]; | |
12871 | uint32_t reg_rt, reg_rn; | |
12872 | ||
12873 | reg_rt = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12874 | reg_rn = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12875 | ||
12876 | if (ARM_PC_REGNUM != reg_rt) | |
12877 | { | |
12878 | record_buf[0] = reg_rt; | |
12879 | record_buf[1] = reg_rn; | |
12880 | record_buf[2] = ARM_PS_REGNUM; | |
12881 | thumb2_insn_r->reg_rec_count = 3; | |
12882 | ||
12883 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12884 | record_buf); | |
12885 | return ARM_RECORD_SUCCESS; | |
12886 | } | |
12887 | ||
12888 | return ARM_RECORD_FAILURE; | |
12889 | } | |
12890 | ||
12891 | /* Handler for thumb2 load word instructions. */ | |
12892 | ||
12893 | static int | |
12894 | thumb2_record_ld_word (insn_decode_record *thumb2_insn_r) | |
12895 | { | |
12896 | uint32_t opcode1 = 0, opcode2 = 0; | |
12897 | uint32_t record_buf[8]; | |
12898 | ||
12899 | record_buf[0] = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12900 | record_buf[1] = ARM_PS_REGNUM; | |
12901 | thumb2_insn_r->reg_rec_count = 2; | |
12902 | ||
12903 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12904 | record_buf); | |
12905 | return ARM_RECORD_SUCCESS; | |
12906 | } | |
12907 | ||
12908 | /* Handler for thumb2 long multiply, long multiply accumulate, and | |
12909 | divide instructions. */ | |
12910 | ||
12911 | static int | |
12912 | thumb2_record_lmul_lmla_div (insn_decode_record *thumb2_insn_r) | |
12913 | { | |
12914 | uint32_t opcode1 = 0, opcode2 = 0; | |
12915 | uint32_t record_buf[8]; | |
12916 | uint32_t reg_src1 = 0; | |
12917 | ||
12918 | opcode1 = bits (thumb2_insn_r->arm_insn, 20, 22); | |
12919 | opcode2 = bits (thumb2_insn_r->arm_insn, 4, 7); | |
12920 | ||
12921 | if (0 == opcode1 || 2 == opcode1 || (opcode1 >= 4 && opcode1 <= 6)) | |
12922 | { | |
12923 | /* Handle SMULL, UMULL, SMULAL. */ | |
12924 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ | |
12925 | record_buf[0] = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12926 | record_buf[1] = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12927 | record_buf[2] = ARM_PS_REGNUM; | |
12928 | thumb2_insn_r->reg_rec_count = 3; | |
12929 | } | |
12930 | else if (1 == opcode1 || 3 == opcode2) | |
12931 | { | |
12932 | /* Handle SDIV and UDIV. */ | |
12933 | record_buf[0] = bits (thumb2_insn_r->arm_insn, 16, 19); | |
12934 | record_buf[1] = bits (thumb2_insn_r->arm_insn, 12, 15); | |
12935 | record_buf[2] = ARM_PS_REGNUM; | |
12936 | thumb2_insn_r->reg_rec_count = 3; | |
12937 | } | |
12938 | else | |
12939 | return ARM_RECORD_FAILURE; | |
12940 | ||
12941 | REG_ALLOC (thumb2_insn_r->arm_regs, thumb2_insn_r->reg_rec_count, | |
12942 | record_buf); | |
12943 | return ARM_RECORD_SUCCESS; | |
12944 | } | |
12945 | ||
12946 | /* Decodes thumb2 instruction type and invokes its record handler. */ | |
12947 | ||
12948 | static unsigned int | |
12949 | thumb2_record_decode_insn_handler (insn_decode_record *thumb2_insn_r) | |
12950 | { | |
12951 | uint32_t op, op1, op2; | |
12952 | ||
12953 | op = bit (thumb2_insn_r->arm_insn, 15); | |
12954 | op1 = bits (thumb2_insn_r->arm_insn, 27, 28); | |
12955 | op2 = bits (thumb2_insn_r->arm_insn, 20, 26); | |
12956 | ||
12957 | if (op1 == 0x01) | |
12958 | { | |
12959 | if (!(op2 & 0x64 )) | |
12960 | { | |
12961 | /* Load/store multiple instruction. */ | |
12962 | return thumb2_record_ld_st_multiple (thumb2_insn_r); | |
12963 | } | |
12964 | else if (!((op2 & 0x64) ^ 0x04)) | |
12965 | { | |
12966 | /* Load/store (dual/exclusive) and table branch instruction. */ | |
12967 | return thumb2_record_ld_st_dual_ex_tbb (thumb2_insn_r); | |
12968 | } | |
12969 | else if (!((op2 & 0x20) ^ 0x20)) | |
12970 | { | |
12971 | /* Data-processing (shifted register). */ | |
12972 | return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r); | |
12973 | } | |
12974 | else if (op2 & 0x40) | |
12975 | { | |
12976 | /* Co-processor instructions. */ | |
12977 | arm_record_unsupported_insn (thumb2_insn_r); | |
12978 | } | |
12979 | } | |
12980 | else if (op1 == 0x02) | |
12981 | { | |
12982 | if (op) | |
12983 | { | |
12984 | /* Branches and miscellaneous control instructions. */ | |
12985 | return thumb2_record_branch_misc_cntrl (thumb2_insn_r); | |
12986 | } | |
12987 | else if (op2 & 0x20) | |
12988 | { | |
12989 | /* Data-processing (plain binary immediate) instruction. */ | |
12990 | return thumb2_record_ps_dest_generic (thumb2_insn_r); | |
12991 | } | |
12992 | else | |
12993 | { | |
12994 | /* Data-processing (modified immediate). */ | |
12995 | return thumb2_record_data_proc_sreg_mimm (thumb2_insn_r); | |
12996 | } | |
12997 | } | |
12998 | else if (op1 == 0x03) | |
12999 | { | |
13000 | if (!(op2 & 0x71 )) | |
13001 | { | |
13002 | /* Store single data item. */ | |
13003 | return thumb2_record_str_single_data (thumb2_insn_r); | |
13004 | } | |
13005 | else if (!((op2 & 0x71) ^ 0x10)) | |
13006 | { | |
13007 | /* Advanced SIMD or structure load/store instructions. */ | |
13008 | return arm_record_unsupported_insn (thumb2_insn_r); | |
13009 | } | |
13010 | else if (!((op2 & 0x67) ^ 0x01)) | |
13011 | { | |
13012 | /* Load byte, memory hints instruction. */ | |
13013 | return thumb2_record_ld_mem_hints (thumb2_insn_r); | |
13014 | } | |
13015 | else if (!((op2 & 0x67) ^ 0x03)) | |
13016 | { | |
13017 | /* Load halfword, memory hints instruction. */ | |
13018 | return thumb2_record_ld_mem_hints (thumb2_insn_r); | |
13019 | } | |
13020 | else if (!((op2 & 0x67) ^ 0x05)) | |
13021 | { | |
13022 | /* Load word instruction. */ | |
13023 | return thumb2_record_ld_word (thumb2_insn_r); | |
13024 | } | |
13025 | else if (!((op2 & 0x70) ^ 0x20)) | |
13026 | { | |
13027 | /* Data-processing (register) instruction. */ | |
13028 | return thumb2_record_ps_dest_generic (thumb2_insn_r); | |
13029 | } | |
13030 | else if (!((op2 & 0x78) ^ 0x30)) | |
13031 | { | |
13032 | /* Multiply, multiply accumulate, abs diff instruction. */ | |
13033 | return thumb2_record_ps_dest_generic (thumb2_insn_r); | |
13034 | } | |
13035 | else if (!((op2 & 0x78) ^ 0x38)) | |
13036 | { | |
13037 | /* Long multiply, long multiply accumulate, and divide. */ | |
13038 | return thumb2_record_lmul_lmla_div (thumb2_insn_r); | |
13039 | } | |
13040 | else if (op2 & 0x40) | |
13041 | { | |
13042 | /* Co-processor instructions. */ | |
13043 | return arm_record_unsupported_insn (thumb2_insn_r); | |
13044 | } | |
13045 | } | |
13046 | ||
13047 | return -1; | |
13048 | } | |
72508ac0 PO |
13049 | |
13050 | /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success | |
13051 | and positive val on fauilure. */ | |
13052 | ||
13053 | static int | |
13054 | extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size) | |
13055 | { | |
13056 | gdb_byte buf[insn_size]; | |
13057 | ||
13058 | memset (&buf[0], 0, insn_size); | |
13059 | ||
13060 | if (target_read_memory (insn_record->this_addr, &buf[0], insn_size)) | |
13061 | return 1; | |
13062 | insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0], | |
13063 | insn_size, | |
13064 | gdbarch_byte_order (insn_record->gdbarch)); | |
13065 | return 0; | |
13066 | } | |
13067 | ||
13068 | typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*); | |
13069 | ||
13070 | /* Decode arm/thumb insn depending on condition cods and opcodes; and | |
13071 | dispatch it. */ | |
13072 | ||
13073 | static int | |
13074 | decode_insn (insn_decode_record *arm_record, record_type_t record_type, | |
13075 | uint32_t insn_size) | |
13076 | { | |
13077 | ||
13078 | /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm instruction. */ | |
13079 | static const sti_arm_hdl_fp_t const arm_handle_insn[8] = | |
13080 | { | |
13081 | arm_record_data_proc_misc_ld_str, /* 000. */ | |
13082 | arm_record_data_proc_imm, /* 001. */ | |
13083 | arm_record_ld_st_imm_offset, /* 010. */ | |
13084 | arm_record_ld_st_reg_offset, /* 011. */ | |
13085 | arm_record_ld_st_multiple, /* 100. */ | |
13086 | arm_record_b_bl, /* 101. */ | |
c6ec2b30 | 13087 | arm_record_unsupported_insn, /* 110. */ |
72508ac0 PO |
13088 | arm_record_coproc_data_proc /* 111. */ |
13089 | }; | |
13090 | ||
13091 | /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb instruction. */ | |
13092 | static const sti_arm_hdl_fp_t const thumb_handle_insn[8] = | |
13093 | { \ | |
13094 | thumb_record_shift_add_sub, /* 000. */ | |
13095 | thumb_record_add_sub_cmp_mov, /* 001. */ | |
13096 | thumb_record_ld_st_reg_offset, /* 010. */ | |
13097 | thumb_record_ld_st_imm_offset, /* 011. */ | |
13098 | thumb_record_ld_st_stack, /* 100. */ | |
13099 | thumb_record_misc, /* 101. */ | |
13100 | thumb_record_ldm_stm_swi, /* 110. */ | |
13101 | thumb_record_branch /* 111. */ | |
13102 | }; | |
13103 | ||
13104 | uint32_t ret = 0; /* return value: negative:failure 0:success. */ | |
13105 | uint32_t insn_id = 0; | |
13106 | ||
13107 | if (extract_arm_insn (arm_record, insn_size)) | |
13108 | { | |
13109 | if (record_debug) | |
13110 | { | |
13111 | printf_unfiltered (_("Process record: error reading memory at " | |
13112 | "addr %s len = %d.\n"), | |
13113 | paddress (arm_record->gdbarch, arm_record->this_addr), insn_size); | |
13114 | } | |
13115 | return -1; | |
13116 | } | |
13117 | else if (ARM_RECORD == record_type) | |
13118 | { | |
13119 | arm_record->cond = bits (arm_record->arm_insn, 28, 31); | |
13120 | insn_id = bits (arm_record->arm_insn, 25, 27); | |
13121 | ret = arm_record_extension_space (arm_record); | |
13122 | /* If this insn has fallen into extension space | |
13123 | then we need not decode it anymore. */ | |
13124 | if (ret != -1 && !INSN_RECORDED(arm_record)) | |
13125 | { | |
13126 | ret = arm_handle_insn[insn_id] (arm_record); | |
13127 | } | |
13128 | } | |
13129 | else if (THUMB_RECORD == record_type) | |
13130 | { | |
13131 | /* As thumb does not have condition codes, we set negative. */ | |
13132 | arm_record->cond = -1; | |
13133 | insn_id = bits (arm_record->arm_insn, 13, 15); | |
13134 | ret = thumb_handle_insn[insn_id] (arm_record); | |
13135 | } | |
13136 | else if (THUMB2_RECORD == record_type) | |
13137 | { | |
c6ec2b30 OJ |
13138 | /* As thumb does not have condition codes, we set negative. */ |
13139 | arm_record->cond = -1; | |
13140 | ||
13141 | /* Swap first half of 32bit thumb instruction with second half. */ | |
13142 | arm_record->arm_insn | |
13143 | = (arm_record->arm_insn >> 16) | (arm_record->arm_insn << 16); | |
13144 | ||
13145 | insn_id = thumb2_record_decode_insn_handler (arm_record); | |
13146 | ||
13147 | if (insn_id != ARM_RECORD_SUCCESS) | |
13148 | { | |
13149 | arm_record_unsupported_insn (arm_record); | |
13150 | ret = -1; | |
13151 | } | |
72508ac0 PO |
13152 | } |
13153 | else | |
13154 | { | |
13155 | /* Throw assertion. */ | |
13156 | gdb_assert_not_reached ("not a valid instruction, could not decode"); | |
13157 | } | |
13158 | ||
13159 | return ret; | |
13160 | } | |
13161 | ||
13162 | ||
13163 | /* Cleans up local record registers and memory allocations. */ | |
13164 | ||
13165 | static void | |
13166 | deallocate_reg_mem (insn_decode_record *record) | |
13167 | { | |
13168 | xfree (record->arm_regs); | |
13169 | xfree (record->arm_mems); | |
13170 | } | |
13171 | ||
13172 | ||
13173 | /* Parse the current instruction and record the values of the registers and | |
13174 | memory that will be changed in current instruction to record_arch_list". | |
13175 | Return -1 if something is wrong. */ | |
13176 | ||
13177 | int | |
13178 | arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache, | |
13179 | CORE_ADDR insn_addr) | |
13180 | { | |
13181 | ||
13182 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
13183 | uint32_t no_of_rec = 0; | |
13184 | uint32_t ret = 0; /* return value: -1:record failure ; 0:success */ | |
13185 | ULONGEST t_bit = 0, insn_id = 0; | |
13186 | ||
13187 | ULONGEST u_regval = 0; | |
13188 | ||
13189 | insn_decode_record arm_record; | |
13190 | ||
13191 | memset (&arm_record, 0, sizeof (insn_decode_record)); | |
13192 | arm_record.regcache = regcache; | |
13193 | arm_record.this_addr = insn_addr; | |
13194 | arm_record.gdbarch = gdbarch; | |
13195 | ||
13196 | ||
13197 | if (record_debug > 1) | |
13198 | { | |
13199 | fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record " | |
13200 | "addr = %s\n", | |
13201 | paddress (gdbarch, arm_record.this_addr)); | |
13202 | } | |
13203 | ||
13204 | if (extract_arm_insn (&arm_record, 2)) | |
13205 | { | |
13206 | if (record_debug) | |
13207 | { | |
13208 | printf_unfiltered (_("Process record: error reading memory at " | |
13209 | "addr %s len = %d.\n"), | |
13210 | paddress (arm_record.gdbarch, | |
13211 | arm_record.this_addr), 2); | |
13212 | } | |
13213 | return -1; | |
13214 | } | |
13215 | ||
13216 | /* Check the insn, whether it is thumb or arm one. */ | |
13217 | ||
13218 | t_bit = arm_psr_thumb_bit (arm_record.gdbarch); | |
13219 | regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM, &u_regval); | |
13220 | ||
13221 | ||
13222 | if (!(u_regval & t_bit)) | |
13223 | { | |
13224 | /* We are decoding arm insn. */ | |
13225 | ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES); | |
13226 | } | |
13227 | else | |
13228 | { | |
13229 | insn_id = bits (arm_record.arm_insn, 11, 15); | |
13230 | /* is it thumb2 insn? */ | |
13231 | if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id)) | |
13232 | { | |
13233 | ret = decode_insn (&arm_record, THUMB2_RECORD, | |
13234 | THUMB2_INSN_SIZE_BYTES); | |
13235 | } | |
13236 | else | |
13237 | { | |
13238 | /* We are decoding thumb insn. */ | |
13239 | ret = decode_insn (&arm_record, THUMB_RECORD, THUMB_INSN_SIZE_BYTES); | |
13240 | } | |
13241 | } | |
13242 | ||
13243 | if (0 == ret) | |
13244 | { | |
13245 | /* Record registers. */ | |
25ea693b | 13246 | record_full_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM); |
72508ac0 PO |
13247 | if (arm_record.arm_regs) |
13248 | { | |
13249 | for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count; no_of_rec++) | |
13250 | { | |
25ea693b MM |
13251 | if (record_full_arch_list_add_reg |
13252 | (arm_record.regcache , arm_record.arm_regs[no_of_rec])) | |
72508ac0 PO |
13253 | ret = -1; |
13254 | } | |
13255 | } | |
13256 | /* Record memories. */ | |
13257 | if (arm_record.arm_mems) | |
13258 | { | |
13259 | for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count; no_of_rec++) | |
13260 | { | |
25ea693b | 13261 | if (record_full_arch_list_add_mem |
72508ac0 | 13262 | ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr, |
25ea693b | 13263 | arm_record.arm_mems[no_of_rec].len)) |
72508ac0 PO |
13264 | ret = -1; |
13265 | } | |
13266 | } | |
13267 | ||
25ea693b | 13268 | if (record_full_arch_list_add_end ()) |
72508ac0 PO |
13269 | ret = -1; |
13270 | } | |
13271 | ||
13272 | ||
13273 | deallocate_reg_mem (&arm_record); | |
13274 | ||
13275 | return ret; | |
13276 | } | |
13277 |