Commit | Line | Data |
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ed9a39eb | 1 | /* Common target dependent code for GDB on ARM systems. |
0fd88904 | 2 | |
28e7fd62 | 3 | Copyright (C) 1988-2013 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" | |
26 | #include "gdbcmd.h" | |
27 | #include "gdbcore.h" | |
c906108c | 28 | #include "gdb_string.h" |
0963b4bd | 29 | #include "dis-asm.h" /* For register styles. */ |
4e052eda | 30 | #include "regcache.h" |
54483882 | 31 | #include "reggroups.h" |
d16aafd8 | 32 | #include "doublest.h" |
fd0407d6 | 33 | #include "value.h" |
34e8f22d | 34 | #include "arch-utils.h" |
4be87837 | 35 | #include "osabi.h" |
eb5492fa DJ |
36 | #include "frame-unwind.h" |
37 | #include "frame-base.h" | |
38 | #include "trad-frame.h" | |
842e1f1e DJ |
39 | #include "objfiles.h" |
40 | #include "dwarf2-frame.h" | |
e4c16157 | 41 | #include "gdbtypes.h" |
29d73ae4 | 42 | #include "prologue-value.h" |
25f8c692 | 43 | #include "remote.h" |
123dc839 DJ |
44 | #include "target-descriptions.h" |
45 | #include "user-regs.h" | |
0e9e9abd | 46 | #include "observer.h" |
34e8f22d RE |
47 | |
48 | #include "arm-tdep.h" | |
26216b98 | 49 | #include "gdb/sim-arm.h" |
34e8f22d | 50 | |
082fc60d RE |
51 | #include "elf-bfd.h" |
52 | #include "coff/internal.h" | |
97e03143 | 53 | #include "elf/arm.h" |
c906108c | 54 | |
26216b98 | 55 | #include "gdb_assert.h" |
60c5725c | 56 | #include "vec.h" |
26216b98 | 57 | |
72508ac0 PO |
58 | #include "record.h" |
59 | ||
9779414d | 60 | #include "features/arm-with-m.c" |
25f8c692 | 61 | #include "features/arm-with-m-fpa-layout.c" |
3184d3f9 | 62 | #include "features/arm-with-m-vfp-d16.c" |
ef7e8358 UW |
63 | #include "features/arm-with-iwmmxt.c" |
64 | #include "features/arm-with-vfpv2.c" | |
65 | #include "features/arm-with-vfpv3.c" | |
66 | #include "features/arm-with-neon.c" | |
9779414d | 67 | |
6529d2dd AC |
68 | static int arm_debug; |
69 | ||
082fc60d RE |
70 | /* Macros for setting and testing a bit in a minimal symbol that marks |
71 | it as Thumb function. The MSB of the minimal symbol's "info" field | |
f594e5e9 | 72 | is used for this purpose. |
082fc60d RE |
73 | |
74 | MSYMBOL_SET_SPECIAL Actually sets the "special" bit. | |
f594e5e9 | 75 | MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */ |
082fc60d | 76 | |
0963b4bd | 77 | #define MSYMBOL_SET_SPECIAL(msym) \ |
b887350f | 78 | MSYMBOL_TARGET_FLAG_1 (msym) = 1 |
082fc60d RE |
79 | |
80 | #define MSYMBOL_IS_SPECIAL(msym) \ | |
b887350f | 81 | MSYMBOL_TARGET_FLAG_1 (msym) |
082fc60d | 82 | |
60c5725c DJ |
83 | /* Per-objfile data used for mapping symbols. */ |
84 | static const struct objfile_data *arm_objfile_data_key; | |
85 | ||
86 | struct arm_mapping_symbol | |
87 | { | |
88 | bfd_vma value; | |
89 | char type; | |
90 | }; | |
91 | typedef struct arm_mapping_symbol arm_mapping_symbol_s; | |
92 | DEF_VEC_O(arm_mapping_symbol_s); | |
93 | ||
94 | struct arm_per_objfile | |
95 | { | |
96 | VEC(arm_mapping_symbol_s) **section_maps; | |
97 | }; | |
98 | ||
afd7eef0 RE |
99 | /* The list of available "set arm ..." and "show arm ..." commands. */ |
100 | static struct cmd_list_element *setarmcmdlist = NULL; | |
101 | static struct cmd_list_element *showarmcmdlist = NULL; | |
102 | ||
fd50bc42 RE |
103 | /* The type of floating-point to use. Keep this in sync with enum |
104 | arm_float_model, and the help string in _initialize_arm_tdep. */ | |
40478521 | 105 | static const char *const fp_model_strings[] = |
fd50bc42 RE |
106 | { |
107 | "auto", | |
108 | "softfpa", | |
109 | "fpa", | |
110 | "softvfp", | |
28e97307 DJ |
111 | "vfp", |
112 | NULL | |
fd50bc42 RE |
113 | }; |
114 | ||
115 | /* A variable that can be configured by the user. */ | |
116 | static enum arm_float_model arm_fp_model = ARM_FLOAT_AUTO; | |
117 | static const char *current_fp_model = "auto"; | |
118 | ||
28e97307 | 119 | /* The ABI to use. Keep this in sync with arm_abi_kind. */ |
40478521 | 120 | static const char *const arm_abi_strings[] = |
28e97307 DJ |
121 | { |
122 | "auto", | |
123 | "APCS", | |
124 | "AAPCS", | |
125 | NULL | |
126 | }; | |
127 | ||
128 | /* A variable that can be configured by the user. */ | |
129 | static enum arm_abi_kind arm_abi_global = ARM_ABI_AUTO; | |
130 | static const char *arm_abi_string = "auto"; | |
131 | ||
0428b8f5 | 132 | /* The execution mode to assume. */ |
40478521 | 133 | static const char *const arm_mode_strings[] = |
0428b8f5 DJ |
134 | { |
135 | "auto", | |
136 | "arm", | |
68770265 MGD |
137 | "thumb", |
138 | NULL | |
0428b8f5 DJ |
139 | }; |
140 | ||
141 | static const char *arm_fallback_mode_string = "auto"; | |
142 | static const char *arm_force_mode_string = "auto"; | |
143 | ||
18819fa6 UW |
144 | /* Internal override of the execution mode. -1 means no override, |
145 | 0 means override to ARM mode, 1 means override to Thumb mode. | |
146 | The effect is the same as if arm_force_mode has been set by the | |
147 | user (except the internal override has precedence over a user's | |
148 | arm_force_mode override). */ | |
149 | static int arm_override_mode = -1; | |
150 | ||
94c30b78 | 151 | /* Number of different reg name sets (options). */ |
afd7eef0 | 152 | static int num_disassembly_options; |
bc90b915 | 153 | |
f32bf4a4 YQ |
154 | /* The standard register names, and all the valid aliases for them. Note |
155 | that `fp', `sp' and `pc' are not added in this alias list, because they | |
156 | have been added as builtin user registers in | |
157 | std-regs.c:_initialize_frame_reg. */ | |
123dc839 DJ |
158 | static const struct |
159 | { | |
160 | const char *name; | |
161 | int regnum; | |
162 | } arm_register_aliases[] = { | |
163 | /* Basic register numbers. */ | |
164 | { "r0", 0 }, | |
165 | { "r1", 1 }, | |
166 | { "r2", 2 }, | |
167 | { "r3", 3 }, | |
168 | { "r4", 4 }, | |
169 | { "r5", 5 }, | |
170 | { "r6", 6 }, | |
171 | { "r7", 7 }, | |
172 | { "r8", 8 }, | |
173 | { "r9", 9 }, | |
174 | { "r10", 10 }, | |
175 | { "r11", 11 }, | |
176 | { "r12", 12 }, | |
177 | { "r13", 13 }, | |
178 | { "r14", 14 }, | |
179 | { "r15", 15 }, | |
180 | /* Synonyms (argument and variable registers). */ | |
181 | { "a1", 0 }, | |
182 | { "a2", 1 }, | |
183 | { "a3", 2 }, | |
184 | { "a4", 3 }, | |
185 | { "v1", 4 }, | |
186 | { "v2", 5 }, | |
187 | { "v3", 6 }, | |
188 | { "v4", 7 }, | |
189 | { "v5", 8 }, | |
190 | { "v6", 9 }, | |
191 | { "v7", 10 }, | |
192 | { "v8", 11 }, | |
193 | /* Other platform-specific names for r9. */ | |
194 | { "sb", 9 }, | |
195 | { "tr", 9 }, | |
196 | /* Special names. */ | |
197 | { "ip", 12 }, | |
123dc839 | 198 | { "lr", 14 }, |
123dc839 DJ |
199 | /* Names used by GCC (not listed in the ARM EABI). */ |
200 | { "sl", 10 }, | |
123dc839 DJ |
201 | /* A special name from the older ATPCS. */ |
202 | { "wr", 7 }, | |
203 | }; | |
bc90b915 | 204 | |
123dc839 | 205 | static const char *const arm_register_names[] = |
da59e081 JM |
206 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
207 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ | |
208 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ | |
209 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ | |
210 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ | |
211 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ | |
94c30b78 | 212 | "fps", "cpsr" }; /* 24 25 */ |
ed9a39eb | 213 | |
afd7eef0 RE |
214 | /* Valid register name styles. */ |
215 | static const char **valid_disassembly_styles; | |
ed9a39eb | 216 | |
afd7eef0 RE |
217 | /* Disassembly style to use. Default to "std" register names. */ |
218 | static const char *disassembly_style; | |
96baa820 | 219 | |
ed9a39eb | 220 | /* This is used to keep the bfd arch_info in sync with the disassembly |
afd7eef0 RE |
221 | style. */ |
222 | static void set_disassembly_style_sfunc(char *, int, | |
ed9a39eb | 223 | struct cmd_list_element *); |
afd7eef0 | 224 | static void set_disassembly_style (void); |
ed9a39eb | 225 | |
b508a996 | 226 | static void convert_from_extended (const struct floatformat *, const void *, |
be8626e0 | 227 | void *, int); |
b508a996 | 228 | static void convert_to_extended (const struct floatformat *, void *, |
be8626e0 | 229 | const void *, int); |
ed9a39eb | 230 | |
05d1431c PA |
231 | static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch, |
232 | struct regcache *regcache, | |
233 | int regnum, gdb_byte *buf); | |
58d6951d DJ |
234 | static void arm_neon_quad_write (struct gdbarch *gdbarch, |
235 | struct regcache *regcache, | |
236 | int regnum, const gdb_byte *buf); | |
237 | ||
db24da6d YQ |
238 | static int thumb_insn_size (unsigned short inst1); |
239 | ||
9b8d791a | 240 | struct arm_prologue_cache |
c3b4394c | 241 | { |
eb5492fa DJ |
242 | /* The stack pointer at the time this frame was created; i.e. the |
243 | caller's stack pointer when this function was called. It is used | |
244 | to identify this frame. */ | |
245 | CORE_ADDR prev_sp; | |
246 | ||
4be43953 DJ |
247 | /* The frame base for this frame is just prev_sp - frame size. |
248 | FRAMESIZE is the distance from the frame pointer to the | |
249 | initial stack pointer. */ | |
eb5492fa | 250 | |
c3b4394c | 251 | int framesize; |
eb5492fa DJ |
252 | |
253 | /* The register used to hold the frame pointer for this frame. */ | |
c3b4394c | 254 | int framereg; |
eb5492fa DJ |
255 | |
256 | /* Saved register offsets. */ | |
257 | struct trad_frame_saved_reg *saved_regs; | |
c3b4394c | 258 | }; |
ed9a39eb | 259 | |
0d39a070 DJ |
260 | static CORE_ADDR arm_analyze_prologue (struct gdbarch *gdbarch, |
261 | CORE_ADDR prologue_start, | |
262 | CORE_ADDR prologue_end, | |
263 | struct arm_prologue_cache *cache); | |
264 | ||
cca44b1b JB |
265 | /* Architecture version for displaced stepping. This effects the behaviour of |
266 | certain instructions, and really should not be hard-wired. */ | |
267 | ||
268 | #define DISPLACED_STEPPING_ARCH_VERSION 5 | |
269 | ||
bc90b915 FN |
270 | /* Addresses for calling Thumb functions have the bit 0 set. |
271 | Here are some macros to test, set, or clear bit 0 of addresses. */ | |
272 | #define IS_THUMB_ADDR(addr) ((addr) & 1) | |
273 | #define MAKE_THUMB_ADDR(addr) ((addr) | 1) | |
274 | #define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1) | |
275 | ||
94c30b78 | 276 | /* Set to true if the 32-bit mode is in use. */ |
c906108c SS |
277 | |
278 | int arm_apcs_32 = 1; | |
279 | ||
9779414d DJ |
280 | /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */ |
281 | ||
478fd957 | 282 | int |
9779414d DJ |
283 | arm_psr_thumb_bit (struct gdbarch *gdbarch) |
284 | { | |
285 | if (gdbarch_tdep (gdbarch)->is_m) | |
286 | return XPSR_T; | |
287 | else | |
288 | return CPSR_T; | |
289 | } | |
290 | ||
b39cc962 DJ |
291 | /* Determine if FRAME is executing in Thumb mode. */ |
292 | ||
25b41d01 | 293 | int |
b39cc962 DJ |
294 | arm_frame_is_thumb (struct frame_info *frame) |
295 | { | |
296 | CORE_ADDR cpsr; | |
9779414d | 297 | ULONGEST t_bit = arm_psr_thumb_bit (get_frame_arch (frame)); |
b39cc962 DJ |
298 | |
299 | /* Every ARM frame unwinder can unwind the T bit of the CPSR, either | |
300 | directly (from a signal frame or dummy frame) or by interpreting | |
301 | the saved LR (from a prologue or DWARF frame). So consult it and | |
302 | trust the unwinders. */ | |
303 | cpsr = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
304 | ||
9779414d | 305 | return (cpsr & t_bit) != 0; |
b39cc962 DJ |
306 | } |
307 | ||
60c5725c DJ |
308 | /* Callback for VEC_lower_bound. */ |
309 | ||
310 | static inline int | |
311 | arm_compare_mapping_symbols (const struct arm_mapping_symbol *lhs, | |
312 | const struct arm_mapping_symbol *rhs) | |
313 | { | |
314 | return lhs->value < rhs->value; | |
315 | } | |
316 | ||
f9d67f43 DJ |
317 | /* Search for the mapping symbol covering MEMADDR. If one is found, |
318 | return its type. Otherwise, return 0. If START is non-NULL, | |
319 | set *START to the location of the mapping symbol. */ | |
c906108c | 320 | |
f9d67f43 DJ |
321 | static char |
322 | arm_find_mapping_symbol (CORE_ADDR memaddr, CORE_ADDR *start) | |
c906108c | 323 | { |
60c5725c | 324 | struct obj_section *sec; |
0428b8f5 | 325 | |
60c5725c DJ |
326 | /* If there are mapping symbols, consult them. */ |
327 | sec = find_pc_section (memaddr); | |
328 | if (sec != NULL) | |
329 | { | |
330 | struct arm_per_objfile *data; | |
331 | VEC(arm_mapping_symbol_s) *map; | |
aded6f54 PA |
332 | struct arm_mapping_symbol map_key = { memaddr - obj_section_addr (sec), |
333 | 0 }; | |
60c5725c DJ |
334 | unsigned int idx; |
335 | ||
336 | data = objfile_data (sec->objfile, arm_objfile_data_key); | |
337 | if (data != NULL) | |
338 | { | |
339 | map = data->section_maps[sec->the_bfd_section->index]; | |
340 | if (!VEC_empty (arm_mapping_symbol_s, map)) | |
341 | { | |
342 | struct arm_mapping_symbol *map_sym; | |
343 | ||
344 | idx = VEC_lower_bound (arm_mapping_symbol_s, map, &map_key, | |
345 | arm_compare_mapping_symbols); | |
346 | ||
347 | /* VEC_lower_bound finds the earliest ordered insertion | |
348 | point. If the following symbol starts at this exact | |
349 | address, we use that; otherwise, the preceding | |
350 | mapping symbol covers this address. */ | |
351 | if (idx < VEC_length (arm_mapping_symbol_s, map)) | |
352 | { | |
353 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx); | |
354 | if (map_sym->value == map_key.value) | |
f9d67f43 DJ |
355 | { |
356 | if (start) | |
357 | *start = map_sym->value + obj_section_addr (sec); | |
358 | return map_sym->type; | |
359 | } | |
60c5725c DJ |
360 | } |
361 | ||
362 | if (idx > 0) | |
363 | { | |
364 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx - 1); | |
f9d67f43 DJ |
365 | if (start) |
366 | *start = map_sym->value + obj_section_addr (sec); | |
367 | return map_sym->type; | |
60c5725c DJ |
368 | } |
369 | } | |
370 | } | |
371 | } | |
372 | ||
f9d67f43 DJ |
373 | return 0; |
374 | } | |
375 | ||
376 | /* Determine if the program counter specified in MEMADDR is in a Thumb | |
377 | function. This function should be called for addresses unrelated to | |
378 | any executing frame; otherwise, prefer arm_frame_is_thumb. */ | |
379 | ||
e3039479 | 380 | int |
9779414d | 381 | arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr) |
f9d67f43 | 382 | { |
f9d67f43 DJ |
383 | struct minimal_symbol *sym; |
384 | char type; | |
a42244db YQ |
385 | struct displaced_step_closure* dsc |
386 | = get_displaced_step_closure_by_addr(memaddr); | |
387 | ||
388 | /* If checking the mode of displaced instruction in copy area, the mode | |
389 | should be determined by instruction on the original address. */ | |
390 | if (dsc) | |
391 | { | |
392 | if (debug_displaced) | |
393 | fprintf_unfiltered (gdb_stdlog, | |
394 | "displaced: check mode of %.8lx instead of %.8lx\n", | |
395 | (unsigned long) dsc->insn_addr, | |
396 | (unsigned long) memaddr); | |
397 | memaddr = dsc->insn_addr; | |
398 | } | |
f9d67f43 DJ |
399 | |
400 | /* If bit 0 of the address is set, assume this is a Thumb address. */ | |
401 | if (IS_THUMB_ADDR (memaddr)) | |
402 | return 1; | |
403 | ||
18819fa6 UW |
404 | /* Respect internal mode override if active. */ |
405 | if (arm_override_mode != -1) | |
406 | return arm_override_mode; | |
407 | ||
f9d67f43 DJ |
408 | /* If the user wants to override the symbol table, let him. */ |
409 | if (strcmp (arm_force_mode_string, "arm") == 0) | |
410 | return 0; | |
411 | if (strcmp (arm_force_mode_string, "thumb") == 0) | |
412 | return 1; | |
413 | ||
9779414d DJ |
414 | /* ARM v6-M and v7-M are always in Thumb mode. */ |
415 | if (gdbarch_tdep (gdbarch)->is_m) | |
416 | return 1; | |
417 | ||
f9d67f43 DJ |
418 | /* If there are mapping symbols, consult them. */ |
419 | type = arm_find_mapping_symbol (memaddr, NULL); | |
420 | if (type) | |
421 | return type == 't'; | |
422 | ||
ed9a39eb | 423 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
c906108c SS |
424 | sym = lookup_minimal_symbol_by_pc (memaddr); |
425 | if (sym) | |
0428b8f5 DJ |
426 | return (MSYMBOL_IS_SPECIAL (sym)); |
427 | ||
428 | /* If the user wants to override the fallback mode, let them. */ | |
429 | if (strcmp (arm_fallback_mode_string, "arm") == 0) | |
430 | return 0; | |
431 | if (strcmp (arm_fallback_mode_string, "thumb") == 0) | |
432 | return 1; | |
433 | ||
434 | /* If we couldn't find any symbol, but we're talking to a running | |
435 | target, then trust the current value of $cpsr. This lets | |
436 | "display/i $pc" always show the correct mode (though if there is | |
437 | a symbol table we will not reach here, so it still may not be | |
18819fa6 | 438 | displayed in the mode it will be executed). */ |
0428b8f5 | 439 | if (target_has_registers) |
18819fa6 | 440 | return arm_frame_is_thumb (get_current_frame ()); |
0428b8f5 DJ |
441 | |
442 | /* Otherwise we're out of luck; we assume ARM. */ | |
443 | return 0; | |
c906108c SS |
444 | } |
445 | ||
181c1381 | 446 | /* Remove useless bits from addresses in a running program. */ |
34e8f22d | 447 | static CORE_ADDR |
24568a2c | 448 | arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val) |
c906108c | 449 | { |
2ae28aa9 YQ |
450 | /* On M-profile devices, do not strip the low bit from EXC_RETURN |
451 | (the magic exception return address). */ | |
452 | if (gdbarch_tdep (gdbarch)->is_m | |
453 | && (val & 0xfffffff0) == 0xfffffff0) | |
454 | return val; | |
455 | ||
a3a2ee65 | 456 | if (arm_apcs_32) |
dd6be234 | 457 | return UNMAKE_THUMB_ADDR (val); |
c906108c | 458 | else |
a3a2ee65 | 459 | return (val & 0x03fffffc); |
c906108c SS |
460 | } |
461 | ||
0d39a070 | 462 | /* Return 1 if PC is the start of a compiler helper function which |
e0634ccf UW |
463 | can be safely ignored during prologue skipping. IS_THUMB is true |
464 | if the function is known to be a Thumb function due to the way it | |
465 | is being called. */ | |
0d39a070 | 466 | static int |
e0634ccf | 467 | skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb) |
0d39a070 | 468 | { |
e0634ccf | 469 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
0d39a070 | 470 | struct minimal_symbol *msym; |
0d39a070 DJ |
471 | |
472 | msym = lookup_minimal_symbol_by_pc (pc); | |
e0634ccf UW |
473 | if (msym != NULL |
474 | && SYMBOL_VALUE_ADDRESS (msym) == pc | |
475 | && SYMBOL_LINKAGE_NAME (msym) != NULL) | |
476 | { | |
477 | const char *name = SYMBOL_LINKAGE_NAME (msym); | |
0d39a070 | 478 | |
e0634ccf UW |
479 | /* The GNU linker's Thumb call stub to foo is named |
480 | __foo_from_thumb. */ | |
481 | if (strstr (name, "_from_thumb") != NULL) | |
482 | name += 2; | |
0d39a070 | 483 | |
e0634ccf UW |
484 | /* On soft-float targets, __truncdfsf2 is called to convert promoted |
485 | arguments to their argument types in non-prototyped | |
486 | functions. */ | |
487 | if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0) | |
488 | return 1; | |
489 | if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0) | |
490 | return 1; | |
0d39a070 | 491 | |
e0634ccf UW |
492 | /* Internal functions related to thread-local storage. */ |
493 | if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0) | |
494 | return 1; | |
495 | if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0) | |
496 | return 1; | |
497 | } | |
498 | else | |
499 | { | |
500 | /* If we run against a stripped glibc, we may be unable to identify | |
501 | special functions by name. Check for one important case, | |
502 | __aeabi_read_tp, by comparing the *code* against the default | |
503 | implementation (this is hand-written ARM assembler in glibc). */ | |
504 | ||
505 | if (!is_thumb | |
506 | && read_memory_unsigned_integer (pc, 4, byte_order_for_code) | |
507 | == 0xe3e00a0f /* mov r0, #0xffff0fff */ | |
508 | && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code) | |
509 | == 0xe240f01f) /* sub pc, r0, #31 */ | |
510 | return 1; | |
511 | } | |
ec3d575a | 512 | |
0d39a070 DJ |
513 | return 0; |
514 | } | |
515 | ||
516 | /* Support routines for instruction parsing. */ | |
517 | #define submask(x) ((1L << ((x) + 1)) - 1) | |
518 | #define bit(obj,st) (((obj) >> (st)) & 1) | |
519 | #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) | |
520 | #define sbits(obj,st,fn) \ | |
521 | ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st)))) | |
522 | #define BranchDest(addr,instr) \ | |
523 | ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2))) | |
524 | ||
621c6d5b YQ |
525 | /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is |
526 | the first 16-bit of instruction, and INSN2 is the second 16-bit of | |
527 | instruction. */ | |
528 | #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \ | |
529 | ((bits ((insn1), 0, 3) << 12) \ | |
530 | | (bits ((insn1), 10, 10) << 11) \ | |
531 | | (bits ((insn2), 12, 14) << 8) \ | |
532 | | bits ((insn2), 0, 7)) | |
533 | ||
534 | /* Extract the immediate from instruction movw/movt of encoding A. INSN is | |
535 | the 32-bit instruction. */ | |
536 | #define EXTRACT_MOVW_MOVT_IMM_A(insn) \ | |
537 | ((bits ((insn), 16, 19) << 12) \ | |
538 | | bits ((insn), 0, 11)) | |
539 | ||
ec3d575a UW |
540 | /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */ |
541 | ||
542 | static unsigned int | |
543 | thumb_expand_immediate (unsigned int imm) | |
544 | { | |
545 | unsigned int count = imm >> 7; | |
546 | ||
547 | if (count < 8) | |
548 | switch (count / 2) | |
549 | { | |
550 | case 0: | |
551 | return imm & 0xff; | |
552 | case 1: | |
553 | return (imm & 0xff) | ((imm & 0xff) << 16); | |
554 | case 2: | |
555 | return ((imm & 0xff) << 8) | ((imm & 0xff) << 24); | |
556 | case 3: | |
557 | return (imm & 0xff) | ((imm & 0xff) << 8) | |
558 | | ((imm & 0xff) << 16) | ((imm & 0xff) << 24); | |
559 | } | |
560 | ||
561 | return (0x80 | (imm & 0x7f)) << (32 - count); | |
562 | } | |
563 | ||
564 | /* Return 1 if the 16-bit Thumb instruction INST might change | |
565 | control flow, 0 otherwise. */ | |
566 | ||
567 | static int | |
568 | thumb_instruction_changes_pc (unsigned short inst) | |
569 | { | |
570 | if ((inst & 0xff00) == 0xbd00) /* pop {rlist, pc} */ | |
571 | return 1; | |
572 | ||
573 | if ((inst & 0xf000) == 0xd000) /* conditional branch */ | |
574 | return 1; | |
575 | ||
576 | if ((inst & 0xf800) == 0xe000) /* unconditional branch */ | |
577 | return 1; | |
578 | ||
579 | if ((inst & 0xff00) == 0x4700) /* bx REG, blx REG */ | |
580 | return 1; | |
581 | ||
ad8b5167 UW |
582 | if ((inst & 0xff87) == 0x4687) /* mov pc, REG */ |
583 | return 1; | |
584 | ||
ec3d575a UW |
585 | if ((inst & 0xf500) == 0xb100) /* CBNZ or CBZ. */ |
586 | return 1; | |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
591 | /* Return 1 if the 32-bit Thumb instruction in INST1 and INST2 | |
592 | might change control flow, 0 otherwise. */ | |
593 | ||
594 | static int | |
595 | thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2) | |
596 | { | |
597 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
598 | { | |
599 | /* Branches and miscellaneous control instructions. */ | |
600 | ||
601 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
602 | { | |
603 | /* B, BL, BLX. */ | |
604 | return 1; | |
605 | } | |
606 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
607 | { | |
608 | /* SUBS PC, LR, #imm8. */ | |
609 | return 1; | |
610 | } | |
611 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) | |
612 | { | |
613 | /* Conditional branch. */ | |
614 | return 1; | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | if ((inst1 & 0xfe50) == 0xe810) | |
621 | { | |
622 | /* Load multiple or RFE. */ | |
623 | ||
624 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
625 | { | |
626 | /* LDMIA or POP */ | |
627 | if (bit (inst2, 15)) | |
628 | return 1; | |
629 | } | |
630 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
631 | { | |
632 | /* LDMDB */ | |
633 | if (bit (inst2, 15)) | |
634 | return 1; | |
635 | } | |
636 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
637 | { | |
638 | /* RFEIA */ | |
639 | return 1; | |
640 | } | |
641 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
642 | { | |
643 | /* RFEDB */ | |
644 | return 1; | |
645 | } | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
651 | { | |
652 | /* MOV PC or MOVS PC. */ | |
653 | return 1; | |
654 | } | |
655 | ||
656 | if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
657 | { | |
658 | /* LDR PC. */ | |
659 | if (bits (inst1, 0, 3) == 15) | |
660 | return 1; | |
661 | if (bit (inst1, 7)) | |
662 | return 1; | |
663 | if (bit (inst2, 11)) | |
664 | return 1; | |
665 | if ((inst2 & 0x0fc0) == 0x0000) | |
666 | return 1; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
672 | { | |
673 | /* TBB. */ | |
674 | return 1; | |
675 | } | |
676 | ||
677 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) | |
678 | { | |
679 | /* TBH. */ | |
680 | return 1; | |
681 | } | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
29d73ae4 DJ |
686 | /* Analyze a Thumb prologue, looking for a recognizable stack frame |
687 | and frame pointer. Scan until we encounter a store that could | |
0d39a070 DJ |
688 | clobber the stack frame unexpectedly, or an unknown instruction. |
689 | Return the last address which is definitely safe to skip for an | |
690 | initial breakpoint. */ | |
c906108c SS |
691 | |
692 | static CORE_ADDR | |
29d73ae4 DJ |
693 | thumb_analyze_prologue (struct gdbarch *gdbarch, |
694 | CORE_ADDR start, CORE_ADDR limit, | |
695 | struct arm_prologue_cache *cache) | |
c906108c | 696 | { |
0d39a070 | 697 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
e17a4113 | 698 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
29d73ae4 DJ |
699 | int i; |
700 | pv_t regs[16]; | |
701 | struct pv_area *stack; | |
702 | struct cleanup *back_to; | |
703 | CORE_ADDR offset; | |
ec3d575a | 704 | CORE_ADDR unrecognized_pc = 0; |
da3c6d4a | 705 | |
29d73ae4 DJ |
706 | for (i = 0; i < 16; i++) |
707 | regs[i] = pv_register (i, 0); | |
55f960e1 | 708 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
29d73ae4 DJ |
709 | back_to = make_cleanup_free_pv_area (stack); |
710 | ||
29d73ae4 | 711 | while (start < limit) |
c906108c | 712 | { |
29d73ae4 DJ |
713 | unsigned short insn; |
714 | ||
e17a4113 | 715 | insn = read_memory_unsigned_integer (start, 2, byte_order_for_code); |
9d4fde75 | 716 | |
94c30b78 | 717 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
da59e081 | 718 | { |
29d73ae4 DJ |
719 | int regno; |
720 | int mask; | |
4be43953 DJ |
721 | |
722 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) | |
723 | break; | |
29d73ae4 DJ |
724 | |
725 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says | |
726 | whether to save LR (R14). */ | |
727 | mask = (insn & 0xff) | ((insn & 0x100) << 6); | |
728 | ||
729 | /* Calculate offsets of saved R0-R7 and LR. */ | |
730 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
731 | if (mask & (1 << regno)) | |
732 | { | |
29d73ae4 DJ |
733 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
734 | -4); | |
735 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); | |
736 | } | |
da59e081 | 737 | } |
da3c6d4a MS |
738 | else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR |
739 | sub sp, #simm */ | |
da59e081 | 740 | { |
29d73ae4 DJ |
741 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
742 | if (insn & 0x80) /* Check for SUB. */ | |
743 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], | |
744 | -offset); | |
da59e081 | 745 | else |
29d73ae4 DJ |
746 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
747 | offset); | |
da59e081 | 748 | } |
0d39a070 DJ |
749 | else if ((insn & 0xf800) == 0xa800) /* add Rd, sp, #imm */ |
750 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM], | |
751 | (insn & 0xff) << 2); | |
752 | else if ((insn & 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */ | |
753 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
754 | regs[bits (insn, 0, 2)] = pv_add_constant (regs[bits (insn, 3, 5)], | |
755 | bits (insn, 6, 8)); | |
756 | else if ((insn & 0xf800) == 0x3000 /* add Rd, #imm */ | |
757 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
758 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[bits (insn, 8, 10)], | |
759 | bits (insn, 0, 7)); | |
760 | else if ((insn & 0xfe00) == 0x1800 /* add Rd, Rn, Rm */ | |
761 | && pv_is_register (regs[bits (insn, 6, 8)], ARM_SP_REGNUM) | |
762 | && pv_is_constant (regs[bits (insn, 3, 5)])) | |
763 | regs[bits (insn, 0, 2)] = pv_add (regs[bits (insn, 3, 5)], | |
764 | regs[bits (insn, 6, 8)]); | |
765 | else if ((insn & 0xff00) == 0x4400 /* add Rd, Rm */ | |
766 | && pv_is_constant (regs[bits (insn, 3, 6)])) | |
767 | { | |
768 | int rd = (bit (insn, 7) << 3) + bits (insn, 0, 2); | |
769 | int rm = bits (insn, 3, 6); | |
770 | regs[rd] = pv_add (regs[rd], regs[rm]); | |
771 | } | |
29d73ae4 | 772 | else if ((insn & 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */ |
da59e081 | 773 | { |
29d73ae4 DJ |
774 | int dst_reg = (insn & 0x7) + ((insn & 0x80) >> 4); |
775 | int src_reg = (insn & 0x78) >> 3; | |
776 | regs[dst_reg] = regs[src_reg]; | |
da59e081 | 777 | } |
29d73ae4 | 778 | else if ((insn & 0xf800) == 0x9000) /* str rd, [sp, #off] */ |
da59e081 | 779 | { |
29d73ae4 DJ |
780 | /* Handle stores to the stack. Normally pushes are used, |
781 | but with GCC -mtpcs-frame, there may be other stores | |
782 | in the prologue to create the frame. */ | |
783 | int regno = (insn >> 8) & 0x7; | |
784 | pv_t addr; | |
785 | ||
786 | offset = (insn & 0xff) << 2; | |
787 | addr = pv_add_constant (regs[ARM_SP_REGNUM], offset); | |
788 | ||
789 | if (pv_area_store_would_trash (stack, addr)) | |
790 | break; | |
791 | ||
792 | pv_area_store (stack, addr, 4, regs[regno]); | |
da59e081 | 793 | } |
0d39a070 DJ |
794 | else if ((insn & 0xf800) == 0x6000) /* str rd, [rn, #off] */ |
795 | { | |
796 | int rd = bits (insn, 0, 2); | |
797 | int rn = bits (insn, 3, 5); | |
798 | pv_t addr; | |
799 | ||
800 | offset = bits (insn, 6, 10) << 2; | |
801 | addr = pv_add_constant (regs[rn], offset); | |
802 | ||
803 | if (pv_area_store_would_trash (stack, addr)) | |
804 | break; | |
805 | ||
806 | pv_area_store (stack, addr, 4, regs[rd]); | |
807 | } | |
808 | else if (((insn & 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */ | |
809 | || (insn & 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */ | |
810 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
811 | /* Ignore stores of argument registers to the stack. */ | |
812 | ; | |
813 | else if ((insn & 0xf800) == 0xc800 /* ldmia Rn!, { registers } */ | |
814 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
815 | /* Ignore block loads from the stack, potentially copying | |
816 | parameters from memory. */ | |
817 | ; | |
818 | else if ((insn & 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */ | |
819 | || ((insn & 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */ | |
820 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM))) | |
821 | /* Similarly ignore single loads from the stack. */ | |
822 | ; | |
823 | else if ((insn & 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */ | |
824 | || (insn & 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */ | |
825 | /* Skip register copies, i.e. saves to another register | |
826 | instead of the stack. */ | |
827 | ; | |
828 | else if ((insn & 0xf800) == 0x2000) /* movs Rd, #imm */ | |
829 | /* Recognize constant loads; even with small stacks these are necessary | |
830 | on Thumb. */ | |
831 | regs[bits (insn, 8, 10)] = pv_constant (bits (insn, 0, 7)); | |
832 | else if ((insn & 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */ | |
833 | { | |
834 | /* Constant pool loads, for the same reason. */ | |
835 | unsigned int constant; | |
836 | CORE_ADDR loc; | |
837 | ||
838 | loc = start + 4 + bits (insn, 0, 7) * 4; | |
839 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
840 | regs[bits (insn, 8, 10)] = pv_constant (constant); | |
841 | } | |
db24da6d | 842 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instructions. */ |
0d39a070 | 843 | { |
0d39a070 DJ |
844 | unsigned short inst2; |
845 | ||
846 | inst2 = read_memory_unsigned_integer (start + 2, 2, | |
847 | byte_order_for_code); | |
848 | ||
849 | if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800) | |
850 | { | |
851 | /* BL, BLX. Allow some special function calls when | |
852 | skipping the prologue; GCC generates these before | |
853 | storing arguments to the stack. */ | |
854 | CORE_ADDR nextpc; | |
855 | int j1, j2, imm1, imm2; | |
856 | ||
857 | imm1 = sbits (insn, 0, 10); | |
858 | imm2 = bits (inst2, 0, 10); | |
859 | j1 = bit (inst2, 13); | |
860 | j2 = bit (inst2, 11); | |
861 | ||
862 | offset = ((imm1 << 12) + (imm2 << 1)); | |
863 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
864 | ||
865 | nextpc = start + 4 + offset; | |
866 | /* For BLX make sure to clear the low bits. */ | |
867 | if (bit (inst2, 12) == 0) | |
868 | nextpc = nextpc & 0xfffffffc; | |
869 | ||
e0634ccf UW |
870 | if (!skip_prologue_function (gdbarch, nextpc, |
871 | bit (inst2, 12) != 0)) | |
0d39a070 DJ |
872 | break; |
873 | } | |
ec3d575a | 874 | |
0963b4bd MS |
875 | else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, |
876 | { registers } */ | |
ec3d575a UW |
877 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
878 | { | |
879 | pv_t addr = regs[bits (insn, 0, 3)]; | |
880 | int regno; | |
881 | ||
882 | if (pv_area_store_would_trash (stack, addr)) | |
883 | break; | |
884 | ||
885 | /* Calculate offsets of saved registers. */ | |
886 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
887 | if (inst2 & (1 << regno)) | |
888 | { | |
889 | addr = pv_add_constant (addr, -4); | |
890 | pv_area_store (stack, addr, 4, regs[regno]); | |
891 | } | |
892 | ||
893 | if (insn & 0x0020) | |
894 | regs[bits (insn, 0, 3)] = addr; | |
895 | } | |
896 | ||
0963b4bd MS |
897 | else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, |
898 | [Rn, #+/-imm]{!} */ | |
ec3d575a UW |
899 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
900 | { | |
901 | int regno1 = bits (inst2, 12, 15); | |
902 | int regno2 = bits (inst2, 8, 11); | |
903 | pv_t addr = regs[bits (insn, 0, 3)]; | |
904 | ||
905 | offset = inst2 & 0xff; | |
906 | if (insn & 0x0080) | |
907 | addr = pv_add_constant (addr, offset); | |
908 | else | |
909 | addr = pv_add_constant (addr, -offset); | |
910 | ||
911 | if (pv_area_store_would_trash (stack, addr)) | |
912 | break; | |
913 | ||
914 | pv_area_store (stack, addr, 4, regs[regno1]); | |
915 | pv_area_store (stack, pv_add_constant (addr, 4), | |
916 | 4, regs[regno2]); | |
917 | ||
918 | if (insn & 0x0020) | |
919 | regs[bits (insn, 0, 3)] = addr; | |
920 | } | |
921 | ||
922 | else if ((insn & 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */ | |
923 | && (inst2 & 0x0c00) == 0x0c00 | |
924 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
925 | { | |
926 | int regno = bits (inst2, 12, 15); | |
927 | pv_t addr = regs[bits (insn, 0, 3)]; | |
928 | ||
929 | offset = inst2 & 0xff; | |
930 | if (inst2 & 0x0200) | |
931 | addr = pv_add_constant (addr, offset); | |
932 | else | |
933 | addr = pv_add_constant (addr, -offset); | |
934 | ||
935 | if (pv_area_store_would_trash (stack, addr)) | |
936 | break; | |
937 | ||
938 | pv_area_store (stack, addr, 4, regs[regno]); | |
939 | ||
940 | if (inst2 & 0x0100) | |
941 | regs[bits (insn, 0, 3)] = addr; | |
942 | } | |
943 | ||
944 | else if ((insn & 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */ | |
945 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
946 | { | |
947 | int regno = bits (inst2, 12, 15); | |
948 | pv_t addr; | |
949 | ||
950 | offset = inst2 & 0xfff; | |
951 | addr = pv_add_constant (regs[bits (insn, 0, 3)], offset); | |
952 | ||
953 | if (pv_area_store_would_trash (stack, addr)) | |
954 | break; | |
955 | ||
956 | pv_area_store (stack, addr, 4, regs[regno]); | |
957 | } | |
958 | ||
959 | else if ((insn & 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */ | |
0d39a070 | 960 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 961 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 962 | ; |
ec3d575a UW |
963 | |
964 | else if ((insn & 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */ | |
965 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 966 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 967 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 968 | ; |
ec3d575a | 969 | |
0963b4bd MS |
970 | else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], |
971 | { registers } */ | |
ec3d575a UW |
972 | && (inst2 & 0x8000) == 0x0000 |
973 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
974 | /* Ignore block loads from the stack, potentially copying | |
975 | parameters from memory. */ | |
0d39a070 | 976 | ; |
ec3d575a | 977 | |
0963b4bd MS |
978 | else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2, |
979 | [Rn, #+/-imm] */ | |
0d39a070 | 980 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 981 | /* Similarly ignore dual loads from the stack. */ |
0d39a070 | 982 | ; |
ec3d575a UW |
983 | |
984 | else if ((insn & 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */ | |
985 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 986 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 987 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 988 | ; |
ec3d575a UW |
989 | |
990 | else if ((insn & 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */ | |
0d39a070 | 991 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 992 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 993 | ; |
ec3d575a UW |
994 | |
995 | else if ((insn & 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */ | |
996 | && (inst2 & 0x8000) == 0x0000) | |
997 | { | |
998 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
999 | | (bits (inst2, 12, 14) << 8) | |
1000 | | bits (inst2, 0, 7)); | |
1001 | ||
1002 | regs[bits (inst2, 8, 11)] | |
1003 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1004 | thumb_expand_immediate (imm)); | |
1005 | } | |
1006 | ||
1007 | else if ((insn & 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */ | |
1008 | && (inst2 & 0x8000) == 0x0000) | |
0d39a070 | 1009 | { |
ec3d575a UW |
1010 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
1011 | | (bits (inst2, 12, 14) << 8) | |
1012 | | bits (inst2, 0, 7)); | |
1013 | ||
1014 | regs[bits (inst2, 8, 11)] | |
1015 | = pv_add_constant (regs[bits (insn, 0, 3)], imm); | |
1016 | } | |
1017 | ||
1018 | else if ((insn & 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */ | |
1019 | && (inst2 & 0x8000) == 0x0000) | |
1020 | { | |
1021 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1022 | | (bits (inst2, 12, 14) << 8) | |
1023 | | bits (inst2, 0, 7)); | |
1024 | ||
1025 | regs[bits (inst2, 8, 11)] | |
1026 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1027 | - (CORE_ADDR) thumb_expand_immediate (imm)); | |
1028 | } | |
1029 | ||
1030 | else if ((insn & 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */ | |
1031 | && (inst2 & 0x8000) == 0x0000) | |
1032 | { | |
1033 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1034 | | (bits (inst2, 12, 14) << 8) | |
1035 | | bits (inst2, 0, 7)); | |
1036 | ||
1037 | regs[bits (inst2, 8, 11)] | |
1038 | = pv_add_constant (regs[bits (insn, 0, 3)], - (CORE_ADDR) imm); | |
1039 | } | |
1040 | ||
1041 | else if ((insn & 0xfbff) == 0xf04f) /* mov.w Rd, #const */ | |
1042 | { | |
1043 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1044 | | (bits (inst2, 12, 14) << 8) | |
1045 | | bits (inst2, 0, 7)); | |
1046 | ||
1047 | regs[bits (inst2, 8, 11)] | |
1048 | = pv_constant (thumb_expand_immediate (imm)); | |
1049 | } | |
1050 | ||
1051 | else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1052 | { | |
621c6d5b YQ |
1053 | unsigned int imm |
1054 | = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2); | |
ec3d575a UW |
1055 | |
1056 | regs[bits (inst2, 8, 11)] = pv_constant (imm); | |
1057 | } | |
1058 | ||
1059 | else if (insn == 0xea5f /* mov.w Rd,Rm */ | |
1060 | && (inst2 & 0xf0f0) == 0) | |
1061 | { | |
1062 | int dst_reg = (inst2 & 0x0f00) >> 8; | |
1063 | int src_reg = inst2 & 0xf; | |
1064 | regs[dst_reg] = regs[src_reg]; | |
1065 | } | |
1066 | ||
1067 | else if ((insn & 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */ | |
1068 | { | |
1069 | /* Constant pool loads. */ | |
1070 | unsigned int constant; | |
1071 | CORE_ADDR loc; | |
1072 | ||
1073 | offset = bits (insn, 0, 11); | |
1074 | if (insn & 0x0080) | |
1075 | loc = start + 4 + offset; | |
1076 | else | |
1077 | loc = start + 4 - offset; | |
1078 | ||
1079 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1080 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1081 | } | |
1082 | ||
1083 | else if ((insn & 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */ | |
1084 | { | |
1085 | /* Constant pool loads. */ | |
1086 | unsigned int constant; | |
1087 | CORE_ADDR loc; | |
1088 | ||
1089 | offset = bits (insn, 0, 7) << 2; | |
1090 | if (insn & 0x0080) | |
1091 | loc = start + 4 + offset; | |
1092 | else | |
1093 | loc = start + 4 - offset; | |
1094 | ||
1095 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1096 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1097 | ||
1098 | constant = read_memory_unsigned_integer (loc + 4, 4, byte_order); | |
1099 | regs[bits (inst2, 8, 11)] = pv_constant (constant); | |
1100 | } | |
1101 | ||
1102 | else if (thumb2_instruction_changes_pc (insn, inst2)) | |
1103 | { | |
1104 | /* Don't scan past anything that might change control flow. */ | |
0d39a070 DJ |
1105 | break; |
1106 | } | |
ec3d575a UW |
1107 | else |
1108 | { | |
1109 | /* The optimizer might shove anything into the prologue, | |
1110 | so we just skip what we don't recognize. */ | |
1111 | unrecognized_pc = start; | |
1112 | } | |
0d39a070 DJ |
1113 | |
1114 | start += 2; | |
1115 | } | |
ec3d575a | 1116 | else if (thumb_instruction_changes_pc (insn)) |
3d74b771 | 1117 | { |
ec3d575a | 1118 | /* Don't scan past anything that might change control flow. */ |
da3c6d4a | 1119 | break; |
3d74b771 | 1120 | } |
ec3d575a UW |
1121 | else |
1122 | { | |
1123 | /* The optimizer might shove anything into the prologue, | |
1124 | so we just skip what we don't recognize. */ | |
1125 | unrecognized_pc = start; | |
1126 | } | |
29d73ae4 DJ |
1127 | |
1128 | start += 2; | |
c906108c SS |
1129 | } |
1130 | ||
0d39a070 DJ |
1131 | if (arm_debug) |
1132 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1133 | paddress (gdbarch, start)); | |
1134 | ||
ec3d575a UW |
1135 | if (unrecognized_pc == 0) |
1136 | unrecognized_pc = start; | |
1137 | ||
29d73ae4 DJ |
1138 | if (cache == NULL) |
1139 | { | |
1140 | do_cleanups (back_to); | |
ec3d575a | 1141 | return unrecognized_pc; |
29d73ae4 DJ |
1142 | } |
1143 | ||
29d73ae4 DJ |
1144 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
1145 | { | |
1146 | /* Frame pointer is fp. Frame size is constant. */ | |
1147 | cache->framereg = ARM_FP_REGNUM; | |
1148 | cache->framesize = -regs[ARM_FP_REGNUM].k; | |
1149 | } | |
1150 | else if (pv_is_register (regs[THUMB_FP_REGNUM], ARM_SP_REGNUM)) | |
1151 | { | |
1152 | /* Frame pointer is r7. Frame size is constant. */ | |
1153 | cache->framereg = THUMB_FP_REGNUM; | |
1154 | cache->framesize = -regs[THUMB_FP_REGNUM].k; | |
1155 | } | |
72a2e3dc | 1156 | else |
29d73ae4 DJ |
1157 | { |
1158 | /* Try the stack pointer... this is a bit desperate. */ | |
1159 | cache->framereg = ARM_SP_REGNUM; | |
1160 | cache->framesize = -regs[ARM_SP_REGNUM].k; | |
1161 | } | |
29d73ae4 DJ |
1162 | |
1163 | for (i = 0; i < 16; i++) | |
1164 | if (pv_area_find_reg (stack, gdbarch, i, &offset)) | |
1165 | cache->saved_regs[i].addr = offset; | |
1166 | ||
1167 | do_cleanups (back_to); | |
ec3d575a | 1168 | return unrecognized_pc; |
c906108c SS |
1169 | } |
1170 | ||
621c6d5b YQ |
1171 | |
1172 | /* Try to analyze the instructions starting from PC, which load symbol | |
1173 | __stack_chk_guard. Return the address of instruction after loading this | |
1174 | symbol, set the dest register number to *BASEREG, and set the size of | |
1175 | instructions for loading symbol in OFFSET. Return 0 if instructions are | |
1176 | not recognized. */ | |
1177 | ||
1178 | static CORE_ADDR | |
1179 | arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch, | |
1180 | unsigned int *destreg, int *offset) | |
1181 | { | |
1182 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1183 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1184 | unsigned int low, high, address; | |
1185 | ||
1186 | address = 0; | |
1187 | if (is_thumb) | |
1188 | { | |
1189 | unsigned short insn1 | |
1190 | = read_memory_unsigned_integer (pc, 2, byte_order_for_code); | |
1191 | ||
1192 | if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */ | |
1193 | { | |
1194 | *destreg = bits (insn1, 8, 10); | |
1195 | *offset = 2; | |
1196 | address = bits (insn1, 0, 7); | |
1197 | } | |
1198 | else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1199 | { | |
1200 | unsigned short insn2 | |
1201 | = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
1202 | ||
1203 | low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1204 | ||
1205 | insn1 | |
1206 | = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code); | |
1207 | insn2 | |
1208 | = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code); | |
1209 | ||
1210 | /* movt Rd, #const */ | |
1211 | if ((insn1 & 0xfbc0) == 0xf2c0) | |
1212 | { | |
1213 | high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1214 | *destreg = bits (insn2, 8, 11); | |
1215 | *offset = 8; | |
1216 | address = (high << 16 | low); | |
1217 | } | |
1218 | } | |
1219 | } | |
1220 | else | |
1221 | { | |
2e9e421f UW |
1222 | unsigned int insn |
1223 | = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
1224 | ||
1225 | if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, #immed */ | |
1226 | { | |
1227 | address = bits (insn, 0, 11); | |
1228 | *destreg = bits (insn, 12, 15); | |
1229 | *offset = 4; | |
1230 | } | |
1231 | else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */ | |
1232 | { | |
1233 | low = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1234 | ||
1235 | insn | |
1236 | = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code); | |
1237 | ||
1238 | if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */ | |
1239 | { | |
1240 | high = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1241 | *destreg = bits (insn, 12, 15); | |
1242 | *offset = 8; | |
1243 | address = (high << 16 | low); | |
1244 | } | |
1245 | } | |
621c6d5b YQ |
1246 | } |
1247 | ||
1248 | return address; | |
1249 | } | |
1250 | ||
1251 | /* Try to skip a sequence of instructions used for stack protector. If PC | |
0963b4bd MS |
1252 | points to the first instruction of this sequence, return the address of |
1253 | first instruction after this sequence, otherwise, return original PC. | |
621c6d5b YQ |
1254 | |
1255 | On arm, this sequence of instructions is composed of mainly three steps, | |
1256 | Step 1: load symbol __stack_chk_guard, | |
1257 | Step 2: load from address of __stack_chk_guard, | |
1258 | Step 3: store it to somewhere else. | |
1259 | ||
1260 | Usually, instructions on step 2 and step 3 are the same on various ARM | |
1261 | architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and | |
1262 | on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However, | |
1263 | instructions in step 1 vary from different ARM architectures. On ARMv7, | |
1264 | they are, | |
1265 | ||
1266 | movw Rn, #:lower16:__stack_chk_guard | |
1267 | movt Rn, #:upper16:__stack_chk_guard | |
1268 | ||
1269 | On ARMv5t, it is, | |
1270 | ||
1271 | ldr Rn, .Label | |
1272 | .... | |
1273 | .Lable: | |
1274 | .word __stack_chk_guard | |
1275 | ||
1276 | Since ldr/str is a very popular instruction, we can't use them as | |
1277 | 'fingerprint' or 'signature' of stack protector sequence. Here we choose | |
1278 | sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not | |
1279 | stripped, as the 'fingerprint' of a stack protector cdoe sequence. */ | |
1280 | ||
1281 | static CORE_ADDR | |
1282 | arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch) | |
1283 | { | |
1284 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
22e048c9 | 1285 | unsigned int basereg; |
621c6d5b YQ |
1286 | struct minimal_symbol *stack_chk_guard; |
1287 | int offset; | |
1288 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1289 | CORE_ADDR addr; | |
1290 | ||
1291 | /* Try to parse the instructions in Step 1. */ | |
1292 | addr = arm_analyze_load_stack_chk_guard (pc, gdbarch, | |
1293 | &basereg, &offset); | |
1294 | if (!addr) | |
1295 | return pc; | |
1296 | ||
1297 | stack_chk_guard = lookup_minimal_symbol_by_pc (addr); | |
1298 | /* If name of symbol doesn't start with '__stack_chk_guard', this | |
1299 | instruction sequence is not for stack protector. If symbol is | |
1300 | removed, we conservatively think this sequence is for stack protector. */ | |
1301 | if (stack_chk_guard | |
c1c2ab58 UW |
1302 | && strncmp (SYMBOL_LINKAGE_NAME (stack_chk_guard), "__stack_chk_guard", |
1303 | strlen ("__stack_chk_guard")) != 0) | |
621c6d5b YQ |
1304 | return pc; |
1305 | ||
1306 | if (is_thumb) | |
1307 | { | |
1308 | unsigned int destreg; | |
1309 | unsigned short insn | |
1310 | = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code); | |
1311 | ||
1312 | /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */ | |
1313 | if ((insn & 0xf800) != 0x6800) | |
1314 | return pc; | |
1315 | if (bits (insn, 3, 5) != basereg) | |
1316 | return pc; | |
1317 | destreg = bits (insn, 0, 2); | |
1318 | ||
1319 | insn = read_memory_unsigned_integer (pc + offset + 2, 2, | |
1320 | byte_order_for_code); | |
1321 | /* Step 3: str Rd, [Rn, #immed], encoding T1. */ | |
1322 | if ((insn & 0xf800) != 0x6000) | |
1323 | return pc; | |
1324 | if (destreg != bits (insn, 0, 2)) | |
1325 | return pc; | |
1326 | } | |
1327 | else | |
1328 | { | |
1329 | unsigned int destreg; | |
1330 | unsigned int insn | |
1331 | = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code); | |
1332 | ||
1333 | /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */ | |
1334 | if ((insn & 0x0e500000) != 0x04100000) | |
1335 | return pc; | |
1336 | if (bits (insn, 16, 19) != basereg) | |
1337 | return pc; | |
1338 | destreg = bits (insn, 12, 15); | |
1339 | /* Step 3: str Rd, [Rn, #immed], encoding A1. */ | |
1340 | insn = read_memory_unsigned_integer (pc + offset + 4, | |
1341 | 4, byte_order_for_code); | |
1342 | if ((insn & 0x0e500000) != 0x04000000) | |
1343 | return pc; | |
1344 | if (bits (insn, 12, 15) != destreg) | |
1345 | return pc; | |
1346 | } | |
1347 | /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8 | |
1348 | on arm. */ | |
1349 | if (is_thumb) | |
1350 | return pc + offset + 4; | |
1351 | else | |
1352 | return pc + offset + 8; | |
1353 | } | |
1354 | ||
da3c6d4a MS |
1355 | /* Advance the PC across any function entry prologue instructions to |
1356 | reach some "real" code. | |
34e8f22d RE |
1357 | |
1358 | The APCS (ARM Procedure Call Standard) defines the following | |
ed9a39eb | 1359 | prologue: |
c906108c | 1360 | |
c5aa993b JM |
1361 | mov ip, sp |
1362 | [stmfd sp!, {a1,a2,a3,a4}] | |
1363 | stmfd sp!, {...,fp,ip,lr,pc} | |
ed9a39eb JM |
1364 | [stfe f7, [sp, #-12]!] |
1365 | [stfe f6, [sp, #-12]!] | |
1366 | [stfe f5, [sp, #-12]!] | |
1367 | [stfe f4, [sp, #-12]!] | |
0963b4bd | 1368 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */ |
c906108c | 1369 | |
34e8f22d | 1370 | static CORE_ADDR |
6093d2eb | 1371 | arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
c906108c | 1372 | { |
e17a4113 | 1373 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
c906108c SS |
1374 | unsigned long inst; |
1375 | CORE_ADDR skip_pc; | |
a89fea3c | 1376 | CORE_ADDR func_addr, limit_pc; |
c906108c | 1377 | |
a89fea3c JL |
1378 | /* See if we can determine the end of the prologue via the symbol table. |
1379 | If so, then return either PC, or the PC after the prologue, whichever | |
1380 | is greater. */ | |
1381 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
c906108c | 1382 | { |
d80b854b UW |
1383 | CORE_ADDR post_prologue_pc |
1384 | = skip_prologue_using_sal (gdbarch, func_addr); | |
0d39a070 DJ |
1385 | struct symtab *s = find_pc_symtab (func_addr); |
1386 | ||
621c6d5b YQ |
1387 | if (post_prologue_pc) |
1388 | post_prologue_pc | |
1389 | = arm_skip_stack_protector (post_prologue_pc, gdbarch); | |
1390 | ||
1391 | ||
0d39a070 DJ |
1392 | /* GCC always emits a line note before the prologue and another |
1393 | one after, even if the two are at the same address or on the | |
1394 | same line. Take advantage of this so that we do not need to | |
1395 | know every instruction that might appear in the prologue. We | |
1396 | will have producer information for most binaries; if it is | |
1397 | missing (e.g. for -gstabs), assuming the GNU tools. */ | |
1398 | if (post_prologue_pc | |
1399 | && (s == NULL | |
1400 | || s->producer == NULL | |
9ead7ae4 KB |
1401 | || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0 |
1402 | || strncmp (s->producer, "clang ", sizeof ("clang ") - 1) == 0)) | |
0d39a070 DJ |
1403 | return post_prologue_pc; |
1404 | ||
a89fea3c | 1405 | if (post_prologue_pc != 0) |
0d39a070 DJ |
1406 | { |
1407 | CORE_ADDR analyzed_limit; | |
1408 | ||
1409 | /* For non-GCC compilers, make sure the entire line is an | |
1410 | acceptable prologue; GDB will round this function's | |
1411 | return value up to the end of the following line so we | |
1412 | can not skip just part of a line (and we do not want to). | |
1413 | ||
1414 | RealView does not treat the prologue specially, but does | |
1415 | associate prologue code with the opening brace; so this | |
1416 | lets us skip the first line if we think it is the opening | |
1417 | brace. */ | |
9779414d | 1418 | if (arm_pc_is_thumb (gdbarch, func_addr)) |
0d39a070 DJ |
1419 | analyzed_limit = thumb_analyze_prologue (gdbarch, func_addr, |
1420 | post_prologue_pc, NULL); | |
1421 | else | |
1422 | analyzed_limit = arm_analyze_prologue (gdbarch, func_addr, | |
1423 | post_prologue_pc, NULL); | |
1424 | ||
1425 | if (analyzed_limit != post_prologue_pc) | |
1426 | return func_addr; | |
1427 | ||
1428 | return post_prologue_pc; | |
1429 | } | |
c906108c SS |
1430 | } |
1431 | ||
a89fea3c JL |
1432 | /* Can't determine prologue from the symbol table, need to examine |
1433 | instructions. */ | |
c906108c | 1434 | |
a89fea3c JL |
1435 | /* Find an upper limit on the function prologue using the debug |
1436 | information. If the debug information could not be used to provide | |
1437 | that bound, then use an arbitrary large number as the upper bound. */ | |
0963b4bd | 1438 | /* Like arm_scan_prologue, stop no later than pc + 64. */ |
d80b854b | 1439 | limit_pc = skip_prologue_using_sal (gdbarch, pc); |
a89fea3c JL |
1440 | if (limit_pc == 0) |
1441 | limit_pc = pc + 64; /* Magic. */ | |
1442 | ||
c906108c | 1443 | |
29d73ae4 | 1444 | /* Check if this is Thumb code. */ |
9779414d | 1445 | if (arm_pc_is_thumb (gdbarch, pc)) |
a89fea3c | 1446 | return thumb_analyze_prologue (gdbarch, pc, limit_pc, NULL); |
29d73ae4 | 1447 | |
a89fea3c | 1448 | for (skip_pc = pc; skip_pc < limit_pc; skip_pc += 4) |
f43845b3 | 1449 | { |
e17a4113 | 1450 | inst = read_memory_unsigned_integer (skip_pc, 4, byte_order_for_code); |
9d4fde75 | 1451 | |
b8d5e71d MS |
1452 | /* "mov ip, sp" is no longer a required part of the prologue. */ |
1453 | if (inst == 0xe1a0c00d) /* mov ip, sp */ | |
1454 | continue; | |
c906108c | 1455 | |
28cd8767 JG |
1456 | if ((inst & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */ |
1457 | continue; | |
1458 | ||
1459 | if ((inst & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */ | |
1460 | continue; | |
1461 | ||
b8d5e71d MS |
1462 | /* Some prologues begin with "str lr, [sp, #-4]!". */ |
1463 | if (inst == 0xe52de004) /* str lr, [sp, #-4]! */ | |
1464 | continue; | |
c906108c | 1465 | |
b8d5e71d MS |
1466 | if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */ |
1467 | continue; | |
c906108c | 1468 | |
b8d5e71d MS |
1469 | if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */ |
1470 | continue; | |
11d3b27d | 1471 | |
b8d5e71d MS |
1472 | /* Any insns after this point may float into the code, if it makes |
1473 | for better instruction scheduling, so we skip them only if we | |
1474 | find them, but still consider the function to be frame-ful. */ | |
f43845b3 | 1475 | |
b8d5e71d MS |
1476 | /* We may have either one sfmfd instruction here, or several stfe |
1477 | insns, depending on the version of floating point code we | |
1478 | support. */ | |
1479 | if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */ | |
1480 | continue; | |
1481 | ||
1482 | if ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */ | |
1483 | continue; | |
1484 | ||
1485 | if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */ | |
1486 | continue; | |
1487 | ||
1488 | if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */ | |
1489 | continue; | |
1490 | ||
f8bf5763 PM |
1491 | if ((inst & 0xffffc000) == 0xe54b0000 /* strb r(0123),[r11,#-nn] */ |
1492 | || (inst & 0xffffc0f0) == 0xe14b00b0 /* strh r(0123),[r11,#-nn] */ | |
1493 | || (inst & 0xffffc000) == 0xe50b0000) /* str r(0123),[r11,#-nn] */ | |
b8d5e71d MS |
1494 | continue; |
1495 | ||
f8bf5763 PM |
1496 | if ((inst & 0xffffc000) == 0xe5cd0000 /* strb r(0123),[sp,#nn] */ |
1497 | || (inst & 0xffffc0f0) == 0xe1cd00b0 /* strh r(0123),[sp,#nn] */ | |
1498 | || (inst & 0xffffc000) == 0xe58d0000) /* str r(0123),[sp,#nn] */ | |
b8d5e71d MS |
1499 | continue; |
1500 | ||
1501 | /* Un-recognized instruction; stop scanning. */ | |
1502 | break; | |
f43845b3 | 1503 | } |
c906108c | 1504 | |
0963b4bd | 1505 | return skip_pc; /* End of prologue. */ |
c906108c | 1506 | } |
94c30b78 | 1507 | |
c5aa993b | 1508 | /* *INDENT-OFF* */ |
c906108c SS |
1509 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
1510 | This function decodes a Thumb function prologue to determine: | |
1511 | 1) the size of the stack frame | |
1512 | 2) which registers are saved on it | |
1513 | 3) the offsets of saved regs | |
1514 | 4) the offset from the stack pointer to the frame pointer | |
c906108c | 1515 | |
da59e081 JM |
1516 | A typical Thumb function prologue would create this stack frame |
1517 | (offsets relative to FP) | |
c906108c SS |
1518 | old SP -> 24 stack parameters |
1519 | 20 LR | |
1520 | 16 R7 | |
1521 | R7 -> 0 local variables (16 bytes) | |
1522 | SP -> -12 additional stack space (12 bytes) | |
1523 | The frame size would thus be 36 bytes, and the frame offset would be | |
0963b4bd | 1524 | 12 bytes. The frame register is R7. |
da59e081 | 1525 | |
da3c6d4a MS |
1526 | The comments for thumb_skip_prolog() describe the algorithm we use |
1527 | to detect the end of the prolog. */ | |
c5aa993b JM |
1528 | /* *INDENT-ON* */ |
1529 | ||
c906108c | 1530 | static void |
be8626e0 | 1531 | thumb_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR prev_pc, |
b39cc962 | 1532 | CORE_ADDR block_addr, struct arm_prologue_cache *cache) |
c906108c SS |
1533 | { |
1534 | CORE_ADDR prologue_start; | |
1535 | CORE_ADDR prologue_end; | |
c906108c | 1536 | |
b39cc962 DJ |
1537 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
1538 | &prologue_end)) | |
c906108c | 1539 | { |
ec3d575a UW |
1540 | /* See comment in arm_scan_prologue for an explanation of |
1541 | this heuristics. */ | |
1542 | if (prologue_end > prologue_start + 64) | |
1543 | { | |
1544 | prologue_end = prologue_start + 64; | |
1545 | } | |
c906108c SS |
1546 | } |
1547 | else | |
f7060f85 DJ |
1548 | /* We're in the boondocks: we have no idea where the start of the |
1549 | function is. */ | |
1550 | return; | |
c906108c | 1551 | |
eb5492fa | 1552 | prologue_end = min (prologue_end, prev_pc); |
c906108c | 1553 | |
be8626e0 | 1554 | thumb_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); |
c906108c SS |
1555 | } |
1556 | ||
0d39a070 | 1557 | /* Return 1 if THIS_INSTR might change control flow, 0 otherwise. */ |
c906108c | 1558 | |
0d39a070 DJ |
1559 | static int |
1560 | arm_instruction_changes_pc (uint32_t this_instr) | |
c906108c | 1561 | { |
0d39a070 DJ |
1562 | if (bits (this_instr, 28, 31) == INST_NV) |
1563 | /* Unconditional instructions. */ | |
1564 | switch (bits (this_instr, 24, 27)) | |
1565 | { | |
1566 | case 0xa: | |
1567 | case 0xb: | |
1568 | /* Branch with Link and change to Thumb. */ | |
1569 | return 1; | |
1570 | case 0xc: | |
1571 | case 0xd: | |
1572 | case 0xe: | |
1573 | /* Coprocessor register transfer. */ | |
1574 | if (bits (this_instr, 12, 15) == 15) | |
1575 | error (_("Invalid update to pc in instruction")); | |
1576 | return 0; | |
1577 | default: | |
1578 | return 0; | |
1579 | } | |
1580 | else | |
1581 | switch (bits (this_instr, 25, 27)) | |
1582 | { | |
1583 | case 0x0: | |
1584 | if (bits (this_instr, 23, 24) == 2 && bit (this_instr, 20) == 0) | |
1585 | { | |
1586 | /* Multiplies and extra load/stores. */ | |
1587 | if (bit (this_instr, 4) == 1 && bit (this_instr, 7) == 1) | |
1588 | /* Neither multiplies nor extension load/stores are allowed | |
1589 | to modify PC. */ | |
1590 | return 0; | |
1591 | ||
1592 | /* Otherwise, miscellaneous instructions. */ | |
1593 | ||
1594 | /* BX <reg>, BXJ <reg>, BLX <reg> */ | |
1595 | if (bits (this_instr, 4, 27) == 0x12fff1 | |
1596 | || bits (this_instr, 4, 27) == 0x12fff2 | |
1597 | || bits (this_instr, 4, 27) == 0x12fff3) | |
1598 | return 1; | |
1599 | ||
1600 | /* Other miscellaneous instructions are unpredictable if they | |
1601 | modify PC. */ | |
1602 | return 0; | |
1603 | } | |
1604 | /* Data processing instruction. Fall through. */ | |
c906108c | 1605 | |
0d39a070 DJ |
1606 | case 0x1: |
1607 | if (bits (this_instr, 12, 15) == 15) | |
1608 | return 1; | |
1609 | else | |
1610 | return 0; | |
c906108c | 1611 | |
0d39a070 DJ |
1612 | case 0x2: |
1613 | case 0x3: | |
1614 | /* Media instructions and architecturally undefined instructions. */ | |
1615 | if (bits (this_instr, 25, 27) == 3 && bit (this_instr, 4) == 1) | |
1616 | return 0; | |
c906108c | 1617 | |
0d39a070 DJ |
1618 | /* Stores. */ |
1619 | if (bit (this_instr, 20) == 0) | |
1620 | return 0; | |
2a451106 | 1621 | |
0d39a070 DJ |
1622 | /* Loads. */ |
1623 | if (bits (this_instr, 12, 15) == ARM_PC_REGNUM) | |
1624 | return 1; | |
1625 | else | |
1626 | return 0; | |
2a451106 | 1627 | |
0d39a070 DJ |
1628 | case 0x4: |
1629 | /* Load/store multiple. */ | |
1630 | if (bit (this_instr, 20) == 1 && bit (this_instr, 15) == 1) | |
1631 | return 1; | |
1632 | else | |
1633 | return 0; | |
2a451106 | 1634 | |
0d39a070 DJ |
1635 | case 0x5: |
1636 | /* Branch and branch with link. */ | |
1637 | return 1; | |
2a451106 | 1638 | |
0d39a070 DJ |
1639 | case 0x6: |
1640 | case 0x7: | |
1641 | /* Coprocessor transfers or SWIs can not affect PC. */ | |
1642 | return 0; | |
eb5492fa | 1643 | |
0d39a070 | 1644 | default: |
9b20d036 | 1645 | internal_error (__FILE__, __LINE__, _("bad value in switch")); |
0d39a070 DJ |
1646 | } |
1647 | } | |
c906108c | 1648 | |
0d39a070 DJ |
1649 | /* Analyze an ARM mode prologue starting at PROLOGUE_START and |
1650 | continuing no further than PROLOGUE_END. If CACHE is non-NULL, | |
1651 | fill it in. Return the first address not recognized as a prologue | |
1652 | instruction. | |
eb5492fa | 1653 | |
0d39a070 DJ |
1654 | We recognize all the instructions typically found in ARM prologues, |
1655 | plus harmless instructions which can be skipped (either for analysis | |
1656 | purposes, or a more restrictive set that can be skipped when finding | |
1657 | the end of the prologue). */ | |
1658 | ||
1659 | static CORE_ADDR | |
1660 | arm_analyze_prologue (struct gdbarch *gdbarch, | |
1661 | CORE_ADDR prologue_start, CORE_ADDR prologue_end, | |
1662 | struct arm_prologue_cache *cache) | |
1663 | { | |
1664 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1665 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1666 | int regno; | |
1667 | CORE_ADDR offset, current_pc; | |
1668 | pv_t regs[ARM_FPS_REGNUM]; | |
1669 | struct pv_area *stack; | |
1670 | struct cleanup *back_to; | |
1671 | int framereg, framesize; | |
1672 | CORE_ADDR unrecognized_pc = 0; | |
1673 | ||
1674 | /* Search the prologue looking for instructions that set up the | |
96baa820 | 1675 | frame pointer, adjust the stack pointer, and save registers. |
ed9a39eb | 1676 | |
96baa820 JM |
1677 | Be careful, however, and if it doesn't look like a prologue, |
1678 | don't try to scan it. If, for instance, a frameless function | |
1679 | begins with stmfd sp!, then we will tell ourselves there is | |
b8d5e71d | 1680 | a frame, which will confuse stack traceback, as well as "finish" |
96baa820 | 1681 | and other operations that rely on a knowledge of the stack |
0d39a070 | 1682 | traceback. */ |
d4473757 | 1683 | |
4be43953 DJ |
1684 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) |
1685 | regs[regno] = pv_register (regno, 0); | |
55f960e1 | 1686 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
4be43953 DJ |
1687 | back_to = make_cleanup_free_pv_area (stack); |
1688 | ||
94c30b78 MS |
1689 | for (current_pc = prologue_start; |
1690 | current_pc < prologue_end; | |
f43845b3 | 1691 | current_pc += 4) |
96baa820 | 1692 | { |
e17a4113 UW |
1693 | unsigned int insn |
1694 | = read_memory_unsigned_integer (current_pc, 4, byte_order_for_code); | |
9d4fde75 | 1695 | |
94c30b78 | 1696 | if (insn == 0xe1a0c00d) /* mov ip, sp */ |
f43845b3 | 1697 | { |
4be43953 | 1698 | regs[ARM_IP_REGNUM] = regs[ARM_SP_REGNUM]; |
28cd8767 JG |
1699 | continue; |
1700 | } | |
0d39a070 DJ |
1701 | else if ((insn & 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */ |
1702 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1703 | { |
1704 | unsigned imm = insn & 0xff; /* immediate value */ | |
1705 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1706 | int rd = bits (insn, 12, 15); |
28cd8767 | 1707 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1708 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], imm); |
28cd8767 JG |
1709 | continue; |
1710 | } | |
0d39a070 DJ |
1711 | else if ((insn & 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */ |
1712 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
28cd8767 JG |
1713 | { |
1714 | unsigned imm = insn & 0xff; /* immediate value */ | |
1715 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
0d39a070 | 1716 | int rd = bits (insn, 12, 15); |
28cd8767 | 1717 | imm = (imm >> rot) | (imm << (32 - rot)); |
0d39a070 | 1718 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], -imm); |
f43845b3 MS |
1719 | continue; |
1720 | } | |
0963b4bd MS |
1721 | else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd, |
1722 | [sp, #-4]! */ | |
f43845b3 | 1723 | { |
4be43953 DJ |
1724 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1725 | break; | |
1726 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
0d39a070 DJ |
1727 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, |
1728 | regs[bits (insn, 12, 15)]); | |
f43845b3 MS |
1729 | continue; |
1730 | } | |
1731 | else if ((insn & 0xffff0000) == 0xe92d0000) | |
d4473757 KB |
1732 | /* stmfd sp!, {..., fp, ip, lr, pc} |
1733 | or | |
1734 | stmfd sp!, {a1, a2, a3, a4} */ | |
c906108c | 1735 | { |
d4473757 | 1736 | int mask = insn & 0xffff; |
ed9a39eb | 1737 | |
4be43953 DJ |
1738 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1739 | break; | |
1740 | ||
94c30b78 | 1741 | /* Calculate offsets of saved registers. */ |
34e8f22d | 1742 | for (regno = ARM_PC_REGNUM; regno >= 0; regno--) |
d4473757 KB |
1743 | if (mask & (1 << regno)) |
1744 | { | |
0963b4bd MS |
1745 | regs[ARM_SP_REGNUM] |
1746 | = pv_add_constant (regs[ARM_SP_REGNUM], -4); | |
4be43953 | 1747 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); |
d4473757 KB |
1748 | } |
1749 | } | |
0d39a070 DJ |
1750 | else if ((insn & 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */ |
1751 | || (insn & 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */ | |
f8bf5763 | 1752 | || (insn & 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */ |
b8d5e71d MS |
1753 | { |
1754 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1755 | continue; | |
1756 | } | |
0d39a070 DJ |
1757 | else if ((insn & 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */ |
1758 | || (insn & 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */ | |
f8bf5763 | 1759 | || (insn & 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */ |
f43845b3 MS |
1760 | { |
1761 | /* No need to add this to saved_regs -- it's just an arg reg. */ | |
1762 | continue; | |
1763 | } | |
0963b4bd MS |
1764 | else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn, |
1765 | { registers } */ | |
0d39a070 DJ |
1766 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
1767 | { | |
1768 | /* No need to add this to saved_regs -- it's just arg regs. */ | |
1769 | continue; | |
1770 | } | |
d4473757 KB |
1771 | else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */ |
1772 | { | |
94c30b78 MS |
1773 | unsigned imm = insn & 0xff; /* immediate value */ |
1774 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1775 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1776 | regs[ARM_FP_REGNUM] = pv_add_constant (regs[ARM_IP_REGNUM], -imm); |
d4473757 KB |
1777 | } |
1778 | else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */ | |
1779 | { | |
94c30b78 MS |
1780 | unsigned imm = insn & 0xff; /* immediate value */ |
1781 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ | |
d4473757 | 1782 | imm = (imm >> rot) | (imm << (32 - rot)); |
4be43953 | 1783 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm); |
d4473757 | 1784 | } |
0963b4bd MS |
1785 | else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, |
1786 | [sp, -#c]! */ | |
2af46ca0 | 1787 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 | 1788 | { |
4be43953 DJ |
1789 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1790 | break; | |
1791 | ||
1792 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); | |
34e8f22d | 1793 | regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07); |
4be43953 | 1794 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, regs[regno]); |
d4473757 | 1795 | } |
0963b4bd MS |
1796 | else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, |
1797 | [sp!] */ | |
2af46ca0 | 1798 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
d4473757 KB |
1799 | { |
1800 | int n_saved_fp_regs; | |
1801 | unsigned int fp_start_reg, fp_bound_reg; | |
1802 | ||
4be43953 DJ |
1803 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
1804 | break; | |
1805 | ||
94c30b78 | 1806 | if ((insn & 0x800) == 0x800) /* N0 is set */ |
96baa820 | 1807 | { |
d4473757 KB |
1808 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1809 | n_saved_fp_regs = 3; | |
1810 | else | |
1811 | n_saved_fp_regs = 1; | |
96baa820 | 1812 | } |
d4473757 | 1813 | else |
96baa820 | 1814 | { |
d4473757 KB |
1815 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
1816 | n_saved_fp_regs = 2; | |
1817 | else | |
1818 | n_saved_fp_regs = 4; | |
96baa820 | 1819 | } |
d4473757 | 1820 | |
34e8f22d | 1821 | fp_start_reg = ARM_F0_REGNUM + ((insn >> 12) & 0x7); |
d4473757 KB |
1822 | fp_bound_reg = fp_start_reg + n_saved_fp_regs; |
1823 | for (; fp_start_reg < fp_bound_reg; fp_start_reg++) | |
96baa820 | 1824 | { |
4be43953 DJ |
1825 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); |
1826 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, | |
1827 | regs[fp_start_reg++]); | |
96baa820 | 1828 | } |
c906108c | 1829 | } |
0d39a070 DJ |
1830 | else if ((insn & 0xff000000) == 0xeb000000 && cache == NULL) /* bl */ |
1831 | { | |
1832 | /* Allow some special function calls when skipping the | |
1833 | prologue; GCC generates these before storing arguments to | |
1834 | the stack. */ | |
1835 | CORE_ADDR dest = BranchDest (current_pc, insn); | |
1836 | ||
e0634ccf | 1837 | if (skip_prologue_function (gdbarch, dest, 0)) |
0d39a070 DJ |
1838 | continue; |
1839 | else | |
1840 | break; | |
1841 | } | |
d4473757 | 1842 | else if ((insn & 0xf0000000) != 0xe0000000) |
0963b4bd | 1843 | break; /* Condition not true, exit early. */ |
0d39a070 DJ |
1844 | else if (arm_instruction_changes_pc (insn)) |
1845 | /* Don't scan past anything that might change control flow. */ | |
1846 | break; | |
d19f7eee UW |
1847 | else if ((insn & 0xfe500000) == 0xe8100000 /* ldm */ |
1848 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1849 | /* Ignore block loads from the stack, potentially copying | |
1850 | parameters from memory. */ | |
1851 | continue; | |
1852 | else if ((insn & 0xfc500000) == 0xe4100000 | |
1853 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) | |
1854 | /* Similarly ignore single loads from the stack. */ | |
1855 | continue; | |
0d39a070 DJ |
1856 | else if ((insn & 0xffff0ff0) == 0xe1a00000) |
1857 | /* MOV Rd, Rm. Skip register copies, i.e. saves to another | |
1858 | register instead of the stack. */ | |
d4473757 | 1859 | continue; |
0d39a070 DJ |
1860 | else |
1861 | { | |
1862 | /* The optimizer might shove anything into the prologue, | |
1863 | so we just skip what we don't recognize. */ | |
1864 | unrecognized_pc = current_pc; | |
1865 | continue; | |
1866 | } | |
c906108c SS |
1867 | } |
1868 | ||
0d39a070 DJ |
1869 | if (unrecognized_pc == 0) |
1870 | unrecognized_pc = current_pc; | |
1871 | ||
4be43953 DJ |
1872 | /* The frame size is just the distance from the frame register |
1873 | to the original stack pointer. */ | |
1874 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) | |
1875 | { | |
1876 | /* Frame pointer is fp. */ | |
0d39a070 DJ |
1877 | framereg = ARM_FP_REGNUM; |
1878 | framesize = -regs[ARM_FP_REGNUM].k; | |
4be43953 | 1879 | } |
72a2e3dc | 1880 | else |
4be43953 DJ |
1881 | { |
1882 | /* Try the stack pointer... this is a bit desperate. */ | |
0d39a070 DJ |
1883 | framereg = ARM_SP_REGNUM; |
1884 | framesize = -regs[ARM_SP_REGNUM].k; | |
4be43953 | 1885 | } |
4be43953 | 1886 | |
0d39a070 DJ |
1887 | if (cache) |
1888 | { | |
1889 | cache->framereg = framereg; | |
1890 | cache->framesize = framesize; | |
1891 | ||
1892 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) | |
1893 | if (pv_area_find_reg (stack, gdbarch, regno, &offset)) | |
1894 | cache->saved_regs[regno].addr = offset; | |
1895 | } | |
1896 | ||
1897 | if (arm_debug) | |
1898 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1899 | paddress (gdbarch, unrecognized_pc)); | |
4be43953 DJ |
1900 | |
1901 | do_cleanups (back_to); | |
0d39a070 DJ |
1902 | return unrecognized_pc; |
1903 | } | |
1904 | ||
1905 | static void | |
1906 | arm_scan_prologue (struct frame_info *this_frame, | |
1907 | struct arm_prologue_cache *cache) | |
1908 | { | |
1909 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1910 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1911 | int regno; | |
1912 | CORE_ADDR prologue_start, prologue_end, current_pc; | |
1913 | CORE_ADDR prev_pc = get_frame_pc (this_frame); | |
1914 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
1915 | pv_t regs[ARM_FPS_REGNUM]; | |
1916 | struct pv_area *stack; | |
1917 | struct cleanup *back_to; | |
1918 | CORE_ADDR offset; | |
1919 | ||
1920 | /* Assume there is no frame until proven otherwise. */ | |
1921 | cache->framereg = ARM_SP_REGNUM; | |
1922 | cache->framesize = 0; | |
1923 | ||
1924 | /* Check for Thumb prologue. */ | |
1925 | if (arm_frame_is_thumb (this_frame)) | |
1926 | { | |
1927 | thumb_scan_prologue (gdbarch, prev_pc, block_addr, cache); | |
1928 | return; | |
1929 | } | |
1930 | ||
1931 | /* Find the function prologue. If we can't find the function in | |
1932 | the symbol table, peek in the stack frame to find the PC. */ | |
1933 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, | |
1934 | &prologue_end)) | |
1935 | { | |
1936 | /* One way to find the end of the prologue (which works well | |
1937 | for unoptimized code) is to do the following: | |
1938 | ||
1939 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
1940 | ||
1941 | if (sal.line == 0) | |
1942 | prologue_end = prev_pc; | |
1943 | else if (sal.end < prologue_end) | |
1944 | prologue_end = sal.end; | |
1945 | ||
1946 | This mechanism is very accurate so long as the optimizer | |
1947 | doesn't move any instructions from the function body into the | |
1948 | prologue. If this happens, sal.end will be the last | |
1949 | instruction in the first hunk of prologue code just before | |
1950 | the first instruction that the scheduler has moved from | |
1951 | the body to the prologue. | |
1952 | ||
1953 | In order to make sure that we scan all of the prologue | |
1954 | instructions, we use a slightly less accurate mechanism which | |
1955 | may scan more than necessary. To help compensate for this | |
1956 | lack of accuracy, the prologue scanning loop below contains | |
1957 | several clauses which'll cause the loop to terminate early if | |
1958 | an implausible prologue instruction is encountered. | |
1959 | ||
1960 | The expression | |
1961 | ||
1962 | prologue_start + 64 | |
1963 | ||
1964 | is a suitable endpoint since it accounts for the largest | |
1965 | possible prologue plus up to five instructions inserted by | |
1966 | the scheduler. */ | |
1967 | ||
1968 | if (prologue_end > prologue_start + 64) | |
1969 | { | |
1970 | prologue_end = prologue_start + 64; /* See above. */ | |
1971 | } | |
1972 | } | |
1973 | else | |
1974 | { | |
1975 | /* We have no symbol information. Our only option is to assume this | |
1976 | function has a standard stack frame and the normal frame register. | |
1977 | Then, we can find the value of our frame pointer on entrance to | |
1978 | the callee (or at the present moment if this is the innermost frame). | |
1979 | The value stored there should be the address of the stmfd + 8. */ | |
1980 | CORE_ADDR frame_loc; | |
1981 | LONGEST return_value; | |
1982 | ||
1983 | frame_loc = get_frame_register_unsigned (this_frame, ARM_FP_REGNUM); | |
1984 | if (!safe_read_memory_integer (frame_loc, 4, byte_order, &return_value)) | |
1985 | return; | |
1986 | else | |
1987 | { | |
1988 | prologue_start = gdbarch_addr_bits_remove | |
1989 | (gdbarch, return_value) - 8; | |
1990 | prologue_end = prologue_start + 64; /* See above. */ | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | if (prev_pc < prologue_end) | |
1995 | prologue_end = prev_pc; | |
1996 | ||
1997 | arm_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); | |
c906108c SS |
1998 | } |
1999 | ||
eb5492fa | 2000 | static struct arm_prologue_cache * |
a262aec2 | 2001 | arm_make_prologue_cache (struct frame_info *this_frame) |
c906108c | 2002 | { |
eb5492fa DJ |
2003 | int reg; |
2004 | struct arm_prologue_cache *cache; | |
2005 | CORE_ADDR unwound_fp; | |
c5aa993b | 2006 | |
35d5d4ee | 2007 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2008 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
c906108c | 2009 | |
a262aec2 | 2010 | arm_scan_prologue (this_frame, cache); |
848cfffb | 2011 | |
a262aec2 | 2012 | unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); |
eb5492fa DJ |
2013 | if (unwound_fp == 0) |
2014 | return cache; | |
c906108c | 2015 | |
4be43953 | 2016 | cache->prev_sp = unwound_fp + cache->framesize; |
c906108c | 2017 | |
eb5492fa DJ |
2018 | /* Calculate actual addresses of saved registers using offsets |
2019 | determined by arm_scan_prologue. */ | |
a262aec2 | 2020 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) |
e28a332c | 2021 | if (trad_frame_addr_p (cache->saved_regs, reg)) |
eb5492fa DJ |
2022 | cache->saved_regs[reg].addr += cache->prev_sp; |
2023 | ||
2024 | return cache; | |
c906108c SS |
2025 | } |
2026 | ||
eb5492fa DJ |
2027 | /* Our frame ID for a normal frame is the current function's starting PC |
2028 | and the caller's SP when we were called. */ | |
c906108c | 2029 | |
148754e5 | 2030 | static void |
a262aec2 | 2031 | arm_prologue_this_id (struct frame_info *this_frame, |
eb5492fa DJ |
2032 | void **this_cache, |
2033 | struct frame_id *this_id) | |
c906108c | 2034 | { |
eb5492fa DJ |
2035 | struct arm_prologue_cache *cache; |
2036 | struct frame_id id; | |
2c404490 | 2037 | CORE_ADDR pc, func; |
f079148d | 2038 | |
eb5492fa | 2039 | if (*this_cache == NULL) |
a262aec2 | 2040 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2041 | cache = *this_cache; |
2a451106 | 2042 | |
2c404490 DJ |
2043 | /* This is meant to halt the backtrace at "_start". */ |
2044 | pc = get_frame_pc (this_frame); | |
2045 | if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) | |
eb5492fa | 2046 | return; |
5a203e44 | 2047 | |
eb5492fa DJ |
2048 | /* If we've hit a wall, stop. */ |
2049 | if (cache->prev_sp == 0) | |
2050 | return; | |
24de872b | 2051 | |
0e9e9abd UW |
2052 | /* Use function start address as part of the frame ID. If we cannot |
2053 | identify the start address (due to missing symbol information), | |
2054 | fall back to just using the current PC. */ | |
2c404490 | 2055 | func = get_frame_func (this_frame); |
0e9e9abd UW |
2056 | if (!func) |
2057 | func = pc; | |
2058 | ||
eb5492fa | 2059 | id = frame_id_build (cache->prev_sp, func); |
eb5492fa | 2060 | *this_id = id; |
c906108c SS |
2061 | } |
2062 | ||
a262aec2 DJ |
2063 | static struct value * |
2064 | arm_prologue_prev_register (struct frame_info *this_frame, | |
eb5492fa | 2065 | void **this_cache, |
a262aec2 | 2066 | int prev_regnum) |
24de872b | 2067 | { |
24568a2c | 2068 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
24de872b DJ |
2069 | struct arm_prologue_cache *cache; |
2070 | ||
eb5492fa | 2071 | if (*this_cache == NULL) |
a262aec2 | 2072 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2073 | cache = *this_cache; |
24de872b | 2074 | |
eb5492fa | 2075 | /* If we are asked to unwind the PC, then we need to return the LR |
b39cc962 DJ |
2076 | instead. The prologue may save PC, but it will point into this |
2077 | frame's prologue, not the next frame's resume location. Also | |
2078 | strip the saved T bit. A valid LR may have the low bit set, but | |
2079 | a valid PC never does. */ | |
eb5492fa | 2080 | if (prev_regnum == ARM_PC_REGNUM) |
b39cc962 DJ |
2081 | { |
2082 | CORE_ADDR lr; | |
2083 | ||
2084 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2085 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
24568a2c | 2086 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 | 2087 | } |
24de872b | 2088 | |
eb5492fa | 2089 | /* SP is generally not saved to the stack, but this frame is |
a262aec2 | 2090 | identified by the next frame's stack pointer at the time of the call. |
eb5492fa DJ |
2091 | The value was already reconstructed into PREV_SP. */ |
2092 | if (prev_regnum == ARM_SP_REGNUM) | |
a262aec2 | 2093 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
eb5492fa | 2094 | |
b39cc962 DJ |
2095 | /* The CPSR may have been changed by the call instruction and by the |
2096 | called function. The only bit we can reconstruct is the T bit, | |
2097 | by checking the low bit of LR as of the call. This is a reliable | |
2098 | indicator of Thumb-ness except for some ARM v4T pre-interworking | |
2099 | Thumb code, which could get away with a clear low bit as long as | |
2100 | the called function did not use bx. Guess that all other | |
2101 | bits are unchanged; the condition flags are presumably lost, | |
2102 | but the processor status is likely valid. */ | |
2103 | if (prev_regnum == ARM_PS_REGNUM) | |
2104 | { | |
2105 | CORE_ADDR lr, cpsr; | |
9779414d | 2106 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
2107 | |
2108 | cpsr = get_frame_register_unsigned (this_frame, prev_regnum); | |
2109 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2110 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 2111 | cpsr |= t_bit; |
b39cc962 | 2112 | else |
9779414d | 2113 | cpsr &= ~t_bit; |
b39cc962 DJ |
2114 | return frame_unwind_got_constant (this_frame, prev_regnum, cpsr); |
2115 | } | |
2116 | ||
a262aec2 DJ |
2117 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
2118 | prev_regnum); | |
eb5492fa DJ |
2119 | } |
2120 | ||
2121 | struct frame_unwind arm_prologue_unwind = { | |
2122 | NORMAL_FRAME, | |
8fbca658 | 2123 | default_frame_unwind_stop_reason, |
eb5492fa | 2124 | arm_prologue_this_id, |
a262aec2 DJ |
2125 | arm_prologue_prev_register, |
2126 | NULL, | |
2127 | default_frame_sniffer | |
eb5492fa DJ |
2128 | }; |
2129 | ||
0e9e9abd UW |
2130 | /* Maintain a list of ARM exception table entries per objfile, similar to the |
2131 | list of mapping symbols. We only cache entries for standard ARM-defined | |
2132 | personality routines; the cache will contain only the frame unwinding | |
2133 | instructions associated with the entry (not the descriptors). */ | |
2134 | ||
2135 | static const struct objfile_data *arm_exidx_data_key; | |
2136 | ||
2137 | struct arm_exidx_entry | |
2138 | { | |
2139 | bfd_vma addr; | |
2140 | gdb_byte *entry; | |
2141 | }; | |
2142 | typedef struct arm_exidx_entry arm_exidx_entry_s; | |
2143 | DEF_VEC_O(arm_exidx_entry_s); | |
2144 | ||
2145 | struct arm_exidx_data | |
2146 | { | |
2147 | VEC(arm_exidx_entry_s) **section_maps; | |
2148 | }; | |
2149 | ||
2150 | static void | |
2151 | arm_exidx_data_free (struct objfile *objfile, void *arg) | |
2152 | { | |
2153 | struct arm_exidx_data *data = arg; | |
2154 | unsigned int i; | |
2155 | ||
2156 | for (i = 0; i < objfile->obfd->section_count; i++) | |
2157 | VEC_free (arm_exidx_entry_s, data->section_maps[i]); | |
2158 | } | |
2159 | ||
2160 | static inline int | |
2161 | arm_compare_exidx_entries (const struct arm_exidx_entry *lhs, | |
2162 | const struct arm_exidx_entry *rhs) | |
2163 | { | |
2164 | return lhs->addr < rhs->addr; | |
2165 | } | |
2166 | ||
2167 | static struct obj_section * | |
2168 | arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma) | |
2169 | { | |
2170 | struct obj_section *osect; | |
2171 | ||
2172 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
2173 | if (bfd_get_section_flags (objfile->obfd, | |
2174 | osect->the_bfd_section) & SEC_ALLOC) | |
2175 | { | |
2176 | bfd_vma start, size; | |
2177 | start = bfd_get_section_vma (objfile->obfd, osect->the_bfd_section); | |
2178 | size = bfd_get_section_size (osect->the_bfd_section); | |
2179 | ||
2180 | if (start <= vma && vma < start + size) | |
2181 | return osect; | |
2182 | } | |
2183 | ||
2184 | return NULL; | |
2185 | } | |
2186 | ||
2187 | /* Parse contents of exception table and exception index sections | |
2188 | of OBJFILE, and fill in the exception table entry cache. | |
2189 | ||
2190 | For each entry that refers to a standard ARM-defined personality | |
2191 | routine, extract the frame unwinding instructions (from either | |
2192 | the index or the table section). The unwinding instructions | |
2193 | are normalized by: | |
2194 | - extracting them from the rest of the table data | |
2195 | - converting to host endianness | |
2196 | - appending the implicit 0xb0 ("Finish") code | |
2197 | ||
2198 | The extracted and normalized instructions are stored for later | |
2199 | retrieval by the arm_find_exidx_entry routine. */ | |
2200 | ||
2201 | static void | |
2202 | arm_exidx_new_objfile (struct objfile *objfile) | |
2203 | { | |
3bb47e8b | 2204 | struct cleanup *cleanups; |
0e9e9abd UW |
2205 | struct arm_exidx_data *data; |
2206 | asection *exidx, *extab; | |
2207 | bfd_vma exidx_vma = 0, extab_vma = 0; | |
2208 | bfd_size_type exidx_size = 0, extab_size = 0; | |
2209 | gdb_byte *exidx_data = NULL, *extab_data = NULL; | |
2210 | LONGEST i; | |
2211 | ||
2212 | /* If we've already touched this file, do nothing. */ | |
2213 | if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL) | |
2214 | return; | |
3bb47e8b | 2215 | cleanups = make_cleanup (null_cleanup, NULL); |
0e9e9abd UW |
2216 | |
2217 | /* Read contents of exception table and index. */ | |
2218 | exidx = bfd_get_section_by_name (objfile->obfd, ".ARM.exidx"); | |
2219 | if (exidx) | |
2220 | { | |
2221 | exidx_vma = bfd_section_vma (objfile->obfd, exidx); | |
2222 | exidx_size = bfd_get_section_size (exidx); | |
2223 | exidx_data = xmalloc (exidx_size); | |
2224 | make_cleanup (xfree, exidx_data); | |
2225 | ||
2226 | if (!bfd_get_section_contents (objfile->obfd, exidx, | |
2227 | exidx_data, 0, exidx_size)) | |
2228 | { | |
2229 | do_cleanups (cleanups); | |
2230 | return; | |
2231 | } | |
2232 | } | |
2233 | ||
2234 | extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab"); | |
2235 | if (extab) | |
2236 | { | |
2237 | extab_vma = bfd_section_vma (objfile->obfd, extab); | |
2238 | extab_size = bfd_get_section_size (extab); | |
2239 | extab_data = xmalloc (extab_size); | |
2240 | make_cleanup (xfree, extab_data); | |
2241 | ||
2242 | if (!bfd_get_section_contents (objfile->obfd, extab, | |
2243 | extab_data, 0, extab_size)) | |
2244 | { | |
2245 | do_cleanups (cleanups); | |
2246 | return; | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | /* Allocate exception table data structure. */ | |
2251 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct arm_exidx_data); | |
2252 | set_objfile_data (objfile, arm_exidx_data_key, data); | |
2253 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
2254 | objfile->obfd->section_count, | |
2255 | VEC(arm_exidx_entry_s) *); | |
2256 | ||
2257 | /* Fill in exception table. */ | |
2258 | for (i = 0; i < exidx_size / 8; i++) | |
2259 | { | |
2260 | struct arm_exidx_entry new_exidx_entry; | |
2261 | bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8); | |
2262 | bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4); | |
2263 | bfd_vma addr = 0, word = 0; | |
2264 | int n_bytes = 0, n_words = 0; | |
2265 | struct obj_section *sec; | |
2266 | gdb_byte *entry = NULL; | |
2267 | ||
2268 | /* Extract address of start of function. */ | |
2269 | idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2270 | idx += exidx_vma + i * 8; | |
2271 | ||
2272 | /* Find section containing function and compute section offset. */ | |
2273 | sec = arm_obj_section_from_vma (objfile, idx); | |
2274 | if (sec == NULL) | |
2275 | continue; | |
2276 | idx -= bfd_get_section_vma (objfile->obfd, sec->the_bfd_section); | |
2277 | ||
2278 | /* Determine address of exception table entry. */ | |
2279 | if (val == 1) | |
2280 | { | |
2281 | /* EXIDX_CANTUNWIND -- no exception table entry present. */ | |
2282 | } | |
2283 | else if ((val & 0xff000000) == 0x80000000) | |
2284 | { | |
2285 | /* Exception table entry embedded in .ARM.exidx | |
2286 | -- must be short form. */ | |
2287 | word = val; | |
2288 | n_bytes = 3; | |
2289 | } | |
2290 | else if (!(val & 0x80000000)) | |
2291 | { | |
2292 | /* Exception table entry in .ARM.extab. */ | |
2293 | addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2294 | addr += exidx_vma + i * 8 + 4; | |
2295 | ||
2296 | if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size) | |
2297 | { | |
2298 | word = bfd_h_get_32 (objfile->obfd, | |
2299 | extab_data + addr - extab_vma); | |
2300 | addr += 4; | |
2301 | ||
2302 | if ((word & 0xff000000) == 0x80000000) | |
2303 | { | |
2304 | /* Short form. */ | |
2305 | n_bytes = 3; | |
2306 | } | |
2307 | else if ((word & 0xff000000) == 0x81000000 | |
2308 | || (word & 0xff000000) == 0x82000000) | |
2309 | { | |
2310 | /* Long form. */ | |
2311 | n_bytes = 2; | |
2312 | n_words = ((word >> 16) & 0xff); | |
2313 | } | |
2314 | else if (!(word & 0x80000000)) | |
2315 | { | |
2316 | bfd_vma pers; | |
2317 | struct obj_section *pers_sec; | |
2318 | int gnu_personality = 0; | |
2319 | ||
2320 | /* Custom personality routine. */ | |
2321 | pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2322 | pers = UNMAKE_THUMB_ADDR (pers + addr - 4); | |
2323 | ||
2324 | /* Check whether we've got one of the variants of the | |
2325 | GNU personality routines. */ | |
2326 | pers_sec = arm_obj_section_from_vma (objfile, pers); | |
2327 | if (pers_sec) | |
2328 | { | |
2329 | static const char *personality[] = | |
2330 | { | |
2331 | "__gcc_personality_v0", | |
2332 | "__gxx_personality_v0", | |
2333 | "__gcj_personality_v0", | |
2334 | "__gnu_objc_personality_v0", | |
2335 | NULL | |
2336 | }; | |
2337 | ||
2338 | CORE_ADDR pc = pers + obj_section_offset (pers_sec); | |
2339 | int k; | |
2340 | ||
2341 | for (k = 0; personality[k]; k++) | |
2342 | if (lookup_minimal_symbol_by_pc_name | |
2343 | (pc, personality[k], objfile)) | |
2344 | { | |
2345 | gnu_personality = 1; | |
2346 | break; | |
2347 | } | |
2348 | } | |
2349 | ||
2350 | /* If so, the next word contains a word count in the high | |
2351 | byte, followed by the same unwind instructions as the | |
2352 | pre-defined forms. */ | |
2353 | if (gnu_personality | |
2354 | && addr + 4 <= extab_vma + extab_size) | |
2355 | { | |
2356 | word = bfd_h_get_32 (objfile->obfd, | |
2357 | extab_data + addr - extab_vma); | |
2358 | addr += 4; | |
2359 | n_bytes = 3; | |
2360 | n_words = ((word >> 24) & 0xff); | |
2361 | } | |
2362 | } | |
2363 | } | |
2364 | } | |
2365 | ||
2366 | /* Sanity check address. */ | |
2367 | if (n_words) | |
2368 | if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size) | |
2369 | n_words = n_bytes = 0; | |
2370 | ||
2371 | /* The unwind instructions reside in WORD (only the N_BYTES least | |
2372 | significant bytes are valid), followed by N_WORDS words in the | |
2373 | extab section starting at ADDR. */ | |
2374 | if (n_bytes || n_words) | |
2375 | { | |
2376 | gdb_byte *p = entry = obstack_alloc (&objfile->objfile_obstack, | |
2377 | n_bytes + n_words * 4 + 1); | |
2378 | ||
2379 | while (n_bytes--) | |
2380 | *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff); | |
2381 | ||
2382 | while (n_words--) | |
2383 | { | |
2384 | word = bfd_h_get_32 (objfile->obfd, | |
2385 | extab_data + addr - extab_vma); | |
2386 | addr += 4; | |
2387 | ||
2388 | *p++ = (gdb_byte) ((word >> 24) & 0xff); | |
2389 | *p++ = (gdb_byte) ((word >> 16) & 0xff); | |
2390 | *p++ = (gdb_byte) ((word >> 8) & 0xff); | |
2391 | *p++ = (gdb_byte) (word & 0xff); | |
2392 | } | |
2393 | ||
2394 | /* Implied "Finish" to terminate the list. */ | |
2395 | *p++ = 0xb0; | |
2396 | } | |
2397 | ||
2398 | /* Push entry onto vector. They are guaranteed to always | |
2399 | appear in order of increasing addresses. */ | |
2400 | new_exidx_entry.addr = idx; | |
2401 | new_exidx_entry.entry = entry; | |
2402 | VEC_safe_push (arm_exidx_entry_s, | |
2403 | data->section_maps[sec->the_bfd_section->index], | |
2404 | &new_exidx_entry); | |
2405 | } | |
2406 | ||
2407 | do_cleanups (cleanups); | |
2408 | } | |
2409 | ||
2410 | /* Search for the exception table entry covering MEMADDR. If one is found, | |
2411 | return a pointer to its data. Otherwise, return 0. If START is non-NULL, | |
2412 | set *START to the start of the region covered by this entry. */ | |
2413 | ||
2414 | static gdb_byte * | |
2415 | arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start) | |
2416 | { | |
2417 | struct obj_section *sec; | |
2418 | ||
2419 | sec = find_pc_section (memaddr); | |
2420 | if (sec != NULL) | |
2421 | { | |
2422 | struct arm_exidx_data *data; | |
2423 | VEC(arm_exidx_entry_s) *map; | |
2424 | struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 }; | |
2425 | unsigned int idx; | |
2426 | ||
2427 | data = objfile_data (sec->objfile, arm_exidx_data_key); | |
2428 | if (data != NULL) | |
2429 | { | |
2430 | map = data->section_maps[sec->the_bfd_section->index]; | |
2431 | if (!VEC_empty (arm_exidx_entry_s, map)) | |
2432 | { | |
2433 | struct arm_exidx_entry *map_sym; | |
2434 | ||
2435 | idx = VEC_lower_bound (arm_exidx_entry_s, map, &map_key, | |
2436 | arm_compare_exidx_entries); | |
2437 | ||
2438 | /* VEC_lower_bound finds the earliest ordered insertion | |
2439 | point. If the following symbol starts at this exact | |
2440 | address, we use that; otherwise, the preceding | |
2441 | exception table entry covers this address. */ | |
2442 | if (idx < VEC_length (arm_exidx_entry_s, map)) | |
2443 | { | |
2444 | map_sym = VEC_index (arm_exidx_entry_s, map, idx); | |
2445 | if (map_sym->addr == map_key.addr) | |
2446 | { | |
2447 | if (start) | |
2448 | *start = map_sym->addr + obj_section_addr (sec); | |
2449 | return map_sym->entry; | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | if (idx > 0) | |
2454 | { | |
2455 | map_sym = VEC_index (arm_exidx_entry_s, map, idx - 1); | |
2456 | if (start) | |
2457 | *start = map_sym->addr + obj_section_addr (sec); | |
2458 | return map_sym->entry; | |
2459 | } | |
2460 | } | |
2461 | } | |
2462 | } | |
2463 | ||
2464 | return NULL; | |
2465 | } | |
2466 | ||
2467 | /* Given the current frame THIS_FRAME, and its associated frame unwinding | |
2468 | instruction list from the ARM exception table entry ENTRY, allocate and | |
2469 | return a prologue cache structure describing how to unwind this frame. | |
2470 | ||
2471 | Return NULL if the unwinding instruction list contains a "spare", | |
2472 | "reserved" or "refuse to unwind" instruction as defined in section | |
2473 | "9.3 Frame unwinding instructions" of the "Exception Handling ABI | |
2474 | for the ARM Architecture" document. */ | |
2475 | ||
2476 | static struct arm_prologue_cache * | |
2477 | arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry) | |
2478 | { | |
2479 | CORE_ADDR vsp = 0; | |
2480 | int vsp_valid = 0; | |
2481 | ||
2482 | struct arm_prologue_cache *cache; | |
2483 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2484 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2485 | ||
2486 | for (;;) | |
2487 | { | |
2488 | gdb_byte insn; | |
2489 | ||
2490 | /* Whenever we reload SP, we actually have to retrieve its | |
2491 | actual value in the current frame. */ | |
2492 | if (!vsp_valid) | |
2493 | { | |
2494 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2495 | { | |
2496 | int reg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2497 | vsp = get_frame_register_unsigned (this_frame, reg); | |
2498 | } | |
2499 | else | |
2500 | { | |
2501 | CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr; | |
2502 | vsp = get_frame_memory_unsigned (this_frame, addr, 4); | |
2503 | } | |
2504 | ||
2505 | vsp_valid = 1; | |
2506 | } | |
2507 | ||
2508 | /* Decode next unwind instruction. */ | |
2509 | insn = *entry++; | |
2510 | ||
2511 | if ((insn & 0xc0) == 0) | |
2512 | { | |
2513 | int offset = insn & 0x3f; | |
2514 | vsp += (offset << 2) + 4; | |
2515 | } | |
2516 | else if ((insn & 0xc0) == 0x40) | |
2517 | { | |
2518 | int offset = insn & 0x3f; | |
2519 | vsp -= (offset << 2) + 4; | |
2520 | } | |
2521 | else if ((insn & 0xf0) == 0x80) | |
2522 | { | |
2523 | int mask = ((insn & 0xf) << 8) | *entry++; | |
2524 | int i; | |
2525 | ||
2526 | /* The special case of an all-zero mask identifies | |
2527 | "Refuse to unwind". We return NULL to fall back | |
2528 | to the prologue analyzer. */ | |
2529 | if (mask == 0) | |
2530 | return NULL; | |
2531 | ||
2532 | /* Pop registers r4..r15 under mask. */ | |
2533 | for (i = 0; i < 12; i++) | |
2534 | if (mask & (1 << i)) | |
2535 | { | |
2536 | cache->saved_regs[4 + i].addr = vsp; | |
2537 | vsp += 4; | |
2538 | } | |
2539 | ||
2540 | /* Special-case popping SP -- we need to reload vsp. */ | |
2541 | if (mask & (1 << (ARM_SP_REGNUM - 4))) | |
2542 | vsp_valid = 0; | |
2543 | } | |
2544 | else if ((insn & 0xf0) == 0x90) | |
2545 | { | |
2546 | int reg = insn & 0xf; | |
2547 | ||
2548 | /* Reserved cases. */ | |
2549 | if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM) | |
2550 | return NULL; | |
2551 | ||
2552 | /* Set SP from another register and mark VSP for reload. */ | |
2553 | cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg]; | |
2554 | vsp_valid = 0; | |
2555 | } | |
2556 | else if ((insn & 0xf0) == 0xa0) | |
2557 | { | |
2558 | int count = insn & 0x7; | |
2559 | int pop_lr = (insn & 0x8) != 0; | |
2560 | int i; | |
2561 | ||
2562 | /* Pop r4..r[4+count]. */ | |
2563 | for (i = 0; i <= count; i++) | |
2564 | { | |
2565 | cache->saved_regs[4 + i].addr = vsp; | |
2566 | vsp += 4; | |
2567 | } | |
2568 | ||
2569 | /* If indicated by flag, pop LR as well. */ | |
2570 | if (pop_lr) | |
2571 | { | |
2572 | cache->saved_regs[ARM_LR_REGNUM].addr = vsp; | |
2573 | vsp += 4; | |
2574 | } | |
2575 | } | |
2576 | else if (insn == 0xb0) | |
2577 | { | |
2578 | /* We could only have updated PC by popping into it; if so, it | |
2579 | will show up as address. Otherwise, copy LR into PC. */ | |
2580 | if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM)) | |
2581 | cache->saved_regs[ARM_PC_REGNUM] | |
2582 | = cache->saved_regs[ARM_LR_REGNUM]; | |
2583 | ||
2584 | /* We're done. */ | |
2585 | break; | |
2586 | } | |
2587 | else if (insn == 0xb1) | |
2588 | { | |
2589 | int mask = *entry++; | |
2590 | int i; | |
2591 | ||
2592 | /* All-zero mask and mask >= 16 is "spare". */ | |
2593 | if (mask == 0 || mask >= 16) | |
2594 | return NULL; | |
2595 | ||
2596 | /* Pop r0..r3 under mask. */ | |
2597 | for (i = 0; i < 4; i++) | |
2598 | if (mask & (1 << i)) | |
2599 | { | |
2600 | cache->saved_regs[i].addr = vsp; | |
2601 | vsp += 4; | |
2602 | } | |
2603 | } | |
2604 | else if (insn == 0xb2) | |
2605 | { | |
2606 | ULONGEST offset = 0; | |
2607 | unsigned shift = 0; | |
2608 | ||
2609 | do | |
2610 | { | |
2611 | offset |= (*entry & 0x7f) << shift; | |
2612 | shift += 7; | |
2613 | } | |
2614 | while (*entry++ & 0x80); | |
2615 | ||
2616 | vsp += 0x204 + (offset << 2); | |
2617 | } | |
2618 | else if (insn == 0xb3) | |
2619 | { | |
2620 | int start = *entry >> 4; | |
2621 | int count = (*entry++) & 0xf; | |
2622 | int i; | |
2623 | ||
2624 | /* Only registers D0..D15 are valid here. */ | |
2625 | if (start + count >= 16) | |
2626 | return NULL; | |
2627 | ||
2628 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2629 | for (i = 0; i <= count; i++) | |
2630 | { | |
2631 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2632 | vsp += 8; | |
2633 | } | |
2634 | ||
2635 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2636 | vsp += 4; | |
2637 | } | |
2638 | else if ((insn & 0xf8) == 0xb8) | |
2639 | { | |
2640 | int count = insn & 0x7; | |
2641 | int i; | |
2642 | ||
2643 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2644 | for (i = 0; i <= count; i++) | |
2645 | { | |
2646 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2647 | vsp += 8; | |
2648 | } | |
2649 | ||
2650 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2651 | vsp += 4; | |
2652 | } | |
2653 | else if (insn == 0xc6) | |
2654 | { | |
2655 | int start = *entry >> 4; | |
2656 | int count = (*entry++) & 0xf; | |
2657 | int i; | |
2658 | ||
2659 | /* Only registers WR0..WR15 are valid. */ | |
2660 | if (start + count >= 16) | |
2661 | return NULL; | |
2662 | ||
2663 | /* Pop iwmmx registers WR[start]..WR[start+count]. */ | |
2664 | for (i = 0; i <= count; i++) | |
2665 | { | |
2666 | cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp; | |
2667 | vsp += 8; | |
2668 | } | |
2669 | } | |
2670 | else if (insn == 0xc7) | |
2671 | { | |
2672 | int mask = *entry++; | |
2673 | int i; | |
2674 | ||
2675 | /* All-zero mask and mask >= 16 is "spare". */ | |
2676 | if (mask == 0 || mask >= 16) | |
2677 | return NULL; | |
2678 | ||
2679 | /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */ | |
2680 | for (i = 0; i < 4; i++) | |
2681 | if (mask & (1 << i)) | |
2682 | { | |
2683 | cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp; | |
2684 | vsp += 4; | |
2685 | } | |
2686 | } | |
2687 | else if ((insn & 0xf8) == 0xc0) | |
2688 | { | |
2689 | int count = insn & 0x7; | |
2690 | int i; | |
2691 | ||
2692 | /* Pop iwmmx registers WR[10]..WR[10+count]. */ | |
2693 | for (i = 0; i <= count; i++) | |
2694 | { | |
2695 | cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp; | |
2696 | vsp += 8; | |
2697 | } | |
2698 | } | |
2699 | else if (insn == 0xc8) | |
2700 | { | |
2701 | int start = *entry >> 4; | |
2702 | int count = (*entry++) & 0xf; | |
2703 | int i; | |
2704 | ||
2705 | /* Only registers D0..D31 are valid. */ | |
2706 | if (start + count >= 16) | |
2707 | return NULL; | |
2708 | ||
2709 | /* Pop VFP double-precision registers | |
2710 | D[16+start]..D[16+start+count]. */ | |
2711 | for (i = 0; i <= count; i++) | |
2712 | { | |
2713 | cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp; | |
2714 | vsp += 8; | |
2715 | } | |
2716 | } | |
2717 | else if (insn == 0xc9) | |
2718 | { | |
2719 | int start = *entry >> 4; | |
2720 | int count = (*entry++) & 0xf; | |
2721 | int i; | |
2722 | ||
2723 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2724 | for (i = 0; i <= count; i++) | |
2725 | { | |
2726 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2727 | vsp += 8; | |
2728 | } | |
2729 | } | |
2730 | else if ((insn & 0xf8) == 0xd0) | |
2731 | { | |
2732 | int count = insn & 0x7; | |
2733 | int i; | |
2734 | ||
2735 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2736 | for (i = 0; i <= count; i++) | |
2737 | { | |
2738 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2739 | vsp += 8; | |
2740 | } | |
2741 | } | |
2742 | else | |
2743 | { | |
2744 | /* Everything else is "spare". */ | |
2745 | return NULL; | |
2746 | } | |
2747 | } | |
2748 | ||
2749 | /* If we restore SP from a register, assume this was the frame register. | |
2750 | Otherwise just fall back to SP as frame register. */ | |
2751 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2752 | cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2753 | else | |
2754 | cache->framereg = ARM_SP_REGNUM; | |
2755 | ||
2756 | /* Determine offset to previous frame. */ | |
2757 | cache->framesize | |
2758 | = vsp - get_frame_register_unsigned (this_frame, cache->framereg); | |
2759 | ||
2760 | /* We already got the previous SP. */ | |
2761 | cache->prev_sp = vsp; | |
2762 | ||
2763 | return cache; | |
2764 | } | |
2765 | ||
2766 | /* Unwinding via ARM exception table entries. Note that the sniffer | |
2767 | already computes a filled-in prologue cache, which is then used | |
2768 | with the same arm_prologue_this_id and arm_prologue_prev_register | |
2769 | routines also used for prologue-parsing based unwinding. */ | |
2770 | ||
2771 | static int | |
2772 | arm_exidx_unwind_sniffer (const struct frame_unwind *self, | |
2773 | struct frame_info *this_frame, | |
2774 | void **this_prologue_cache) | |
2775 | { | |
2776 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2777 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
2778 | CORE_ADDR addr_in_block, exidx_region, func_start; | |
2779 | struct arm_prologue_cache *cache; | |
2780 | gdb_byte *entry; | |
2781 | ||
2782 | /* See if we have an ARM exception table entry covering this address. */ | |
2783 | addr_in_block = get_frame_address_in_block (this_frame); | |
2784 | entry = arm_find_exidx_entry (addr_in_block, &exidx_region); | |
2785 | if (!entry) | |
2786 | return 0; | |
2787 | ||
2788 | /* The ARM exception table does not describe unwind information | |
2789 | for arbitrary PC values, but is guaranteed to be correct only | |
2790 | at call sites. We have to decide here whether we want to use | |
2791 | ARM exception table information for this frame, or fall back | |
2792 | to using prologue parsing. (Note that if we have DWARF CFI, | |
2793 | this sniffer isn't even called -- CFI is always preferred.) | |
2794 | ||
2795 | Before we make this decision, however, we check whether we | |
2796 | actually have *symbol* information for the current frame. | |
2797 | If not, prologue parsing would not work anyway, so we might | |
2798 | as well use the exception table and hope for the best. */ | |
2799 | if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL)) | |
2800 | { | |
2801 | int exc_valid = 0; | |
2802 | ||
2803 | /* If the next frame is "normal", we are at a call site in this | |
2804 | frame, so exception information is guaranteed to be valid. */ | |
2805 | if (get_next_frame (this_frame) | |
2806 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) | |
2807 | exc_valid = 1; | |
2808 | ||
2809 | /* We also assume exception information is valid if we're currently | |
2810 | blocked in a system call. The system library is supposed to | |
2811 | ensure this, so that e.g. pthread cancellation works. */ | |
2812 | if (arm_frame_is_thumb (this_frame)) | |
2813 | { | |
2814 | LONGEST insn; | |
2815 | ||
2816 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 2, 2, | |
2817 | byte_order_for_code, &insn) | |
2818 | && (insn & 0xff00) == 0xdf00 /* svc */) | |
2819 | exc_valid = 1; | |
2820 | } | |
2821 | else | |
2822 | { | |
2823 | LONGEST insn; | |
2824 | ||
2825 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 4, 4, | |
2826 | byte_order_for_code, &insn) | |
2827 | && (insn & 0x0f000000) == 0x0f000000 /* svc */) | |
2828 | exc_valid = 1; | |
2829 | } | |
2830 | ||
2831 | /* Bail out if we don't know that exception information is valid. */ | |
2832 | if (!exc_valid) | |
2833 | return 0; | |
2834 | ||
2835 | /* The ARM exception index does not mark the *end* of the region | |
2836 | covered by the entry, and some functions will not have any entry. | |
2837 | To correctly recognize the end of the covered region, the linker | |
2838 | should have inserted dummy records with a CANTUNWIND marker. | |
2839 | ||
2840 | Unfortunately, current versions of GNU ld do not reliably do | |
2841 | this, and thus we may have found an incorrect entry above. | |
2842 | As a (temporary) sanity check, we only use the entry if it | |
2843 | lies *within* the bounds of the function. Note that this check | |
2844 | might reject perfectly valid entries that just happen to cover | |
2845 | multiple functions; therefore this check ought to be removed | |
2846 | once the linker is fixed. */ | |
2847 | if (func_start > exidx_region) | |
2848 | return 0; | |
2849 | } | |
2850 | ||
2851 | /* Decode the list of unwinding instructions into a prologue cache. | |
2852 | Note that this may fail due to e.g. a "refuse to unwind" code. */ | |
2853 | cache = arm_exidx_fill_cache (this_frame, entry); | |
2854 | if (!cache) | |
2855 | return 0; | |
2856 | ||
2857 | *this_prologue_cache = cache; | |
2858 | return 1; | |
2859 | } | |
2860 | ||
2861 | struct frame_unwind arm_exidx_unwind = { | |
2862 | NORMAL_FRAME, | |
8fbca658 | 2863 | default_frame_unwind_stop_reason, |
0e9e9abd UW |
2864 | arm_prologue_this_id, |
2865 | arm_prologue_prev_register, | |
2866 | NULL, | |
2867 | arm_exidx_unwind_sniffer | |
2868 | }; | |
2869 | ||
909cf6ea | 2870 | static struct arm_prologue_cache * |
a262aec2 | 2871 | arm_make_stub_cache (struct frame_info *this_frame) |
909cf6ea | 2872 | { |
909cf6ea | 2873 | struct arm_prologue_cache *cache; |
909cf6ea | 2874 | |
35d5d4ee | 2875 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2876 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
909cf6ea | 2877 | |
a262aec2 | 2878 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); |
909cf6ea DJ |
2879 | |
2880 | return cache; | |
2881 | } | |
2882 | ||
2883 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2884 | ||
2885 | static void | |
a262aec2 | 2886 | arm_stub_this_id (struct frame_info *this_frame, |
909cf6ea DJ |
2887 | void **this_cache, |
2888 | struct frame_id *this_id) | |
2889 | { | |
2890 | struct arm_prologue_cache *cache; | |
2891 | ||
2892 | if (*this_cache == NULL) | |
a262aec2 | 2893 | *this_cache = arm_make_stub_cache (this_frame); |
909cf6ea DJ |
2894 | cache = *this_cache; |
2895 | ||
a262aec2 | 2896 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
909cf6ea DJ |
2897 | } |
2898 | ||
a262aec2 DJ |
2899 | static int |
2900 | arm_stub_unwind_sniffer (const struct frame_unwind *self, | |
2901 | struct frame_info *this_frame, | |
2902 | void **this_prologue_cache) | |
909cf6ea | 2903 | { |
93d42b30 | 2904 | CORE_ADDR addr_in_block; |
909cf6ea DJ |
2905 | char dummy[4]; |
2906 | ||
a262aec2 | 2907 | addr_in_block = get_frame_address_in_block (this_frame); |
93d42b30 | 2908 | if (in_plt_section (addr_in_block, NULL) |
fc36e839 DE |
2909 | /* We also use the stub winder if the target memory is unreadable |
2910 | to avoid having the prologue unwinder trying to read it. */ | |
a262aec2 DJ |
2911 | || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0) |
2912 | return 1; | |
909cf6ea | 2913 | |
a262aec2 | 2914 | return 0; |
909cf6ea DJ |
2915 | } |
2916 | ||
a262aec2 DJ |
2917 | struct frame_unwind arm_stub_unwind = { |
2918 | NORMAL_FRAME, | |
8fbca658 | 2919 | default_frame_unwind_stop_reason, |
a262aec2 DJ |
2920 | arm_stub_this_id, |
2921 | arm_prologue_prev_register, | |
2922 | NULL, | |
2923 | arm_stub_unwind_sniffer | |
2924 | }; | |
2925 | ||
2ae28aa9 YQ |
2926 | /* Put here the code to store, into CACHE->saved_regs, the addresses |
2927 | of the saved registers of frame described by THIS_FRAME. CACHE is | |
2928 | returned. */ | |
2929 | ||
2930 | static struct arm_prologue_cache * | |
2931 | arm_m_exception_cache (struct frame_info *this_frame) | |
2932 | { | |
2933 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2934 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
2935 | struct arm_prologue_cache *cache; | |
2936 | CORE_ADDR unwound_sp; | |
2937 | LONGEST xpsr; | |
2938 | ||
2939 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2940 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2941 | ||
2942 | unwound_sp = get_frame_register_unsigned (this_frame, | |
2943 | ARM_SP_REGNUM); | |
2944 | ||
2945 | /* The hardware saves eight 32-bit words, comprising xPSR, | |
2946 | ReturnAddress, LR (R14), R12, R3, R2, R1, R0. See details in | |
2947 | "B1.5.6 Exception entry behavior" in | |
2948 | "ARMv7-M Architecture Reference Manual". */ | |
2949 | cache->saved_regs[0].addr = unwound_sp; | |
2950 | cache->saved_regs[1].addr = unwound_sp + 4; | |
2951 | cache->saved_regs[2].addr = unwound_sp + 8; | |
2952 | cache->saved_regs[3].addr = unwound_sp + 12; | |
2953 | cache->saved_regs[12].addr = unwound_sp + 16; | |
2954 | cache->saved_regs[14].addr = unwound_sp + 20; | |
2955 | cache->saved_regs[15].addr = unwound_sp + 24; | |
2956 | cache->saved_regs[ARM_PS_REGNUM].addr = unwound_sp + 28; | |
2957 | ||
2958 | /* If bit 9 of the saved xPSR is set, then there is a four-byte | |
2959 | aligner between the top of the 32-byte stack frame and the | |
2960 | previous context's stack pointer. */ | |
2961 | cache->prev_sp = unwound_sp + 32; | |
2962 | if (safe_read_memory_integer (unwound_sp + 28, 4, byte_order, &xpsr) | |
2963 | && (xpsr & (1 << 9)) != 0) | |
2964 | cache->prev_sp += 4; | |
2965 | ||
2966 | return cache; | |
2967 | } | |
2968 | ||
2969 | /* Implementation of function hook 'this_id' in | |
2970 | 'struct frame_uwnind'. */ | |
2971 | ||
2972 | static void | |
2973 | arm_m_exception_this_id (struct frame_info *this_frame, | |
2974 | void **this_cache, | |
2975 | struct frame_id *this_id) | |
2976 | { | |
2977 | struct arm_prologue_cache *cache; | |
2978 | ||
2979 | if (*this_cache == NULL) | |
2980 | *this_cache = arm_m_exception_cache (this_frame); | |
2981 | cache = *this_cache; | |
2982 | ||
2983 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2984 | *this_id = frame_id_build (cache->prev_sp, | |
2985 | get_frame_pc (this_frame)); | |
2986 | } | |
2987 | ||
2988 | /* Implementation of function hook 'prev_register' in | |
2989 | 'struct frame_uwnind'. */ | |
2990 | ||
2991 | static struct value * | |
2992 | arm_m_exception_prev_register (struct frame_info *this_frame, | |
2993 | void **this_cache, | |
2994 | int prev_regnum) | |
2995 | { | |
2996 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2997 | struct arm_prologue_cache *cache; | |
2998 | ||
2999 | if (*this_cache == NULL) | |
3000 | *this_cache = arm_m_exception_cache (this_frame); | |
3001 | cache = *this_cache; | |
3002 | ||
3003 | /* The value was already reconstructed into PREV_SP. */ | |
3004 | if (prev_regnum == ARM_SP_REGNUM) | |
3005 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
3006 | cache->prev_sp); | |
3007 | ||
3008 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, | |
3009 | prev_regnum); | |
3010 | } | |
3011 | ||
3012 | /* Implementation of function hook 'sniffer' in | |
3013 | 'struct frame_uwnind'. */ | |
3014 | ||
3015 | static int | |
3016 | arm_m_exception_unwind_sniffer (const struct frame_unwind *self, | |
3017 | struct frame_info *this_frame, | |
3018 | void **this_prologue_cache) | |
3019 | { | |
3020 | CORE_ADDR this_pc = get_frame_pc (this_frame); | |
3021 | ||
3022 | /* No need to check is_m; this sniffer is only registered for | |
3023 | M-profile architectures. */ | |
3024 | ||
3025 | /* Exception frames return to one of these magic PCs. Other values | |
3026 | are not defined as of v7-M. See details in "B1.5.8 Exception | |
3027 | return behavior" in "ARMv7-M Architecture Reference Manual". */ | |
3028 | if (this_pc == 0xfffffff1 || this_pc == 0xfffffff9 | |
3029 | || this_pc == 0xfffffffd) | |
3030 | return 1; | |
3031 | ||
3032 | return 0; | |
3033 | } | |
3034 | ||
3035 | /* Frame unwinder for M-profile exceptions. */ | |
3036 | ||
3037 | struct frame_unwind arm_m_exception_unwind = | |
3038 | { | |
3039 | SIGTRAMP_FRAME, | |
3040 | default_frame_unwind_stop_reason, | |
3041 | arm_m_exception_this_id, | |
3042 | arm_m_exception_prev_register, | |
3043 | NULL, | |
3044 | arm_m_exception_unwind_sniffer | |
3045 | }; | |
3046 | ||
24de872b | 3047 | static CORE_ADDR |
a262aec2 | 3048 | arm_normal_frame_base (struct frame_info *this_frame, void **this_cache) |
24de872b DJ |
3049 | { |
3050 | struct arm_prologue_cache *cache; | |
3051 | ||
eb5492fa | 3052 | if (*this_cache == NULL) |
a262aec2 | 3053 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa DJ |
3054 | cache = *this_cache; |
3055 | ||
4be43953 | 3056 | return cache->prev_sp - cache->framesize; |
24de872b DJ |
3057 | } |
3058 | ||
eb5492fa DJ |
3059 | struct frame_base arm_normal_base = { |
3060 | &arm_prologue_unwind, | |
3061 | arm_normal_frame_base, | |
3062 | arm_normal_frame_base, | |
3063 | arm_normal_frame_base | |
3064 | }; | |
3065 | ||
a262aec2 | 3066 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that |
eb5492fa DJ |
3067 | dummy frame. The frame ID's base needs to match the TOS value |
3068 | saved by save_dummy_frame_tos() and returned from | |
3069 | arm_push_dummy_call, and the PC needs to match the dummy frame's | |
3070 | breakpoint. */ | |
c906108c | 3071 | |
eb5492fa | 3072 | static struct frame_id |
a262aec2 | 3073 | arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
c906108c | 3074 | { |
0963b4bd MS |
3075 | return frame_id_build (get_frame_register_unsigned (this_frame, |
3076 | ARM_SP_REGNUM), | |
a262aec2 | 3077 | get_frame_pc (this_frame)); |
eb5492fa | 3078 | } |
c3b4394c | 3079 | |
eb5492fa DJ |
3080 | /* Given THIS_FRAME, find the previous frame's resume PC (which will |
3081 | be used to construct the previous frame's ID, after looking up the | |
3082 | containing function). */ | |
c3b4394c | 3083 | |
eb5492fa DJ |
3084 | static CORE_ADDR |
3085 | arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
3086 | { | |
3087 | CORE_ADDR pc; | |
3088 | pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM); | |
24568a2c | 3089 | return arm_addr_bits_remove (gdbarch, pc); |
eb5492fa DJ |
3090 | } |
3091 | ||
3092 | static CORE_ADDR | |
3093 | arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
3094 | { | |
3095 | return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM); | |
c906108c SS |
3096 | } |
3097 | ||
b39cc962 DJ |
3098 | static struct value * |
3099 | arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, | |
3100 | int regnum) | |
3101 | { | |
24568a2c | 3102 | struct gdbarch * gdbarch = get_frame_arch (this_frame); |
b39cc962 | 3103 | CORE_ADDR lr, cpsr; |
9779414d | 3104 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
3105 | |
3106 | switch (regnum) | |
3107 | { | |
3108 | case ARM_PC_REGNUM: | |
3109 | /* The PC is normally copied from the return column, which | |
3110 | describes saves of LR. However, that version may have an | |
3111 | extra bit set to indicate Thumb state. The bit is not | |
3112 | part of the PC. */ | |
3113 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
3114 | return frame_unwind_got_constant (this_frame, regnum, | |
24568a2c | 3115 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 DJ |
3116 | |
3117 | case ARM_PS_REGNUM: | |
3118 | /* Reconstruct the T bit; see arm_prologue_prev_register for details. */ | |
ca38c58e | 3119 | cpsr = get_frame_register_unsigned (this_frame, regnum); |
b39cc962 DJ |
3120 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
3121 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 3122 | cpsr |= t_bit; |
b39cc962 | 3123 | else |
9779414d | 3124 | cpsr &= ~t_bit; |
ca38c58e | 3125 | return frame_unwind_got_constant (this_frame, regnum, cpsr); |
b39cc962 DJ |
3126 | |
3127 | default: | |
3128 | internal_error (__FILE__, __LINE__, | |
3129 | _("Unexpected register %d"), regnum); | |
3130 | } | |
3131 | } | |
3132 | ||
3133 | static void | |
3134 | arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
3135 | struct dwarf2_frame_state_reg *reg, | |
3136 | struct frame_info *this_frame) | |
3137 | { | |
3138 | switch (regnum) | |
3139 | { | |
3140 | case ARM_PC_REGNUM: | |
3141 | case ARM_PS_REGNUM: | |
3142 | reg->how = DWARF2_FRAME_REG_FN; | |
3143 | reg->loc.fn = arm_dwarf2_prev_register; | |
3144 | break; | |
3145 | case ARM_SP_REGNUM: | |
3146 | reg->how = DWARF2_FRAME_REG_CFA; | |
3147 | break; | |
3148 | } | |
3149 | } | |
3150 | ||
4024ca99 UW |
3151 | /* Return true if we are in the function's epilogue, i.e. after the |
3152 | instruction that destroyed the function's stack frame. */ | |
3153 | ||
3154 | static int | |
3155 | thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3156 | { | |
3157 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3158 | unsigned int insn, insn2; | |
3159 | int found_return = 0, found_stack_adjust = 0; | |
3160 | CORE_ADDR func_start, func_end; | |
3161 | CORE_ADDR scan_pc; | |
3162 | gdb_byte buf[4]; | |
3163 | ||
3164 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3165 | return 0; | |
3166 | ||
3167 | /* The epilogue is a sequence of instructions along the following lines: | |
3168 | ||
3169 | - add stack frame size to SP or FP | |
3170 | - [if frame pointer used] restore SP from FP | |
3171 | - restore registers from SP [may include PC] | |
3172 | - a return-type instruction [if PC wasn't already restored] | |
3173 | ||
3174 | In a first pass, we scan forward from the current PC and verify the | |
3175 | instructions we find as compatible with this sequence, ending in a | |
3176 | return instruction. | |
3177 | ||
3178 | However, this is not sufficient to distinguish indirect function calls | |
3179 | within a function from indirect tail calls in the epilogue in some cases. | |
3180 | Therefore, if we didn't already find any SP-changing instruction during | |
3181 | forward scan, we add a backward scanning heuristic to ensure we actually | |
3182 | are in the epilogue. */ | |
3183 | ||
3184 | scan_pc = pc; | |
3185 | while (scan_pc < func_end && !found_return) | |
3186 | { | |
3187 | if (target_read_memory (scan_pc, buf, 2)) | |
3188 | break; | |
3189 | ||
3190 | scan_pc += 2; | |
3191 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3192 | ||
3193 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
3194 | found_return = 1; | |
3195 | else if (insn == 0x46f7) /* mov pc, lr */ | |
3196 | found_return = 1; | |
3197 | else if (insn == 0x46bd) /* mov sp, r7 */ | |
3198 | found_stack_adjust = 1; | |
3199 | else if ((insn & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ | |
3200 | found_stack_adjust = 1; | |
3201 | else if ((insn & 0xfe00) == 0xbc00) /* pop <registers> */ | |
3202 | { | |
3203 | found_stack_adjust = 1; | |
3204 | if (insn & 0x0100) /* <registers> include PC. */ | |
3205 | found_return = 1; | |
3206 | } | |
db24da6d | 3207 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instruction */ |
4024ca99 UW |
3208 | { |
3209 | if (target_read_memory (scan_pc, buf, 2)) | |
3210 | break; | |
3211 | ||
3212 | scan_pc += 2; | |
3213 | insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3214 | ||
3215 | if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3216 | { | |
3217 | found_stack_adjust = 1; | |
3218 | if (insn2 & 0x8000) /* <registers> include PC. */ | |
3219 | found_return = 1; | |
3220 | } | |
3221 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3222 | && (insn2 & 0x0fff) == 0x0b04) | |
3223 | { | |
3224 | found_stack_adjust = 1; | |
3225 | if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */ | |
3226 | found_return = 1; | |
3227 | } | |
3228 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3229 | && (insn2 & 0x0e00) == 0x0a00) | |
3230 | found_stack_adjust = 1; | |
3231 | else | |
3232 | break; | |
3233 | } | |
3234 | else | |
3235 | break; | |
3236 | } | |
3237 | ||
3238 | if (!found_return) | |
3239 | return 0; | |
3240 | ||
3241 | /* Since any instruction in the epilogue sequence, with the possible | |
3242 | exception of return itself, updates the stack pointer, we need to | |
3243 | scan backwards for at most one instruction. Try either a 16-bit or | |
3244 | a 32-bit instruction. This is just a heuristic, so we do not worry | |
0963b4bd | 3245 | too much about false positives. */ |
4024ca99 UW |
3246 | |
3247 | if (!found_stack_adjust) | |
3248 | { | |
3249 | if (pc - 4 < func_start) | |
3250 | return 0; | |
3251 | if (target_read_memory (pc - 4, buf, 4)) | |
3252 | return 0; | |
3253 | ||
3254 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3255 | insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code); | |
3256 | ||
3257 | if (insn2 == 0x46bd) /* mov sp, r7 */ | |
3258 | found_stack_adjust = 1; | |
3259 | else if ((insn2 & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ | |
3260 | found_stack_adjust = 1; | |
3261 | else if ((insn2 & 0xff00) == 0xbc00) /* pop <registers> without PC */ | |
3262 | found_stack_adjust = 1; | |
3263 | else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3264 | found_stack_adjust = 1; | |
3265 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3266 | && (insn2 & 0x0fff) == 0x0b04) | |
3267 | found_stack_adjust = 1; | |
3268 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3269 | && (insn2 & 0x0e00) == 0x0a00) | |
3270 | found_stack_adjust = 1; | |
3271 | } | |
3272 | ||
3273 | return found_stack_adjust; | |
3274 | } | |
3275 | ||
3276 | /* Return true if we are in the function's epilogue, i.e. after the | |
3277 | instruction that destroyed the function's stack frame. */ | |
3278 | ||
3279 | static int | |
3280 | arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3281 | { | |
3282 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3283 | unsigned int insn; | |
3284 | int found_return, found_stack_adjust; | |
3285 | CORE_ADDR func_start, func_end; | |
3286 | ||
3287 | if (arm_pc_is_thumb (gdbarch, pc)) | |
3288 | return thumb_in_function_epilogue_p (gdbarch, pc); | |
3289 | ||
3290 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3291 | return 0; | |
3292 | ||
3293 | /* We are in the epilogue if the previous instruction was a stack | |
3294 | adjustment and the next instruction is a possible return (bx, mov | |
3295 | pc, or pop). We could have to scan backwards to find the stack | |
3296 | adjustment, or forwards to find the return, but this is a decent | |
3297 | approximation. First scan forwards. */ | |
3298 | ||
3299 | found_return = 0; | |
3300 | insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
3301 | if (bits (insn, 28, 31) != INST_NV) | |
3302 | { | |
3303 | if ((insn & 0x0ffffff0) == 0x012fff10) | |
3304 | /* BX. */ | |
3305 | found_return = 1; | |
3306 | else if ((insn & 0x0ffffff0) == 0x01a0f000) | |
3307 | /* MOV PC. */ | |
3308 | found_return = 1; | |
3309 | else if ((insn & 0x0fff0000) == 0x08bd0000 | |
3310 | && (insn & 0x0000c000) != 0) | |
3311 | /* POP (LDMIA), including PC or LR. */ | |
3312 | found_return = 1; | |
3313 | } | |
3314 | ||
3315 | if (!found_return) | |
3316 | return 0; | |
3317 | ||
3318 | /* Scan backwards. This is just a heuristic, so do not worry about | |
3319 | false positives from mode changes. */ | |
3320 | ||
3321 | if (pc < func_start + 4) | |
3322 | return 0; | |
3323 | ||
73c964d6 | 3324 | found_stack_adjust = 0; |
4024ca99 UW |
3325 | insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); |
3326 | if (bits (insn, 28, 31) != INST_NV) | |
3327 | { | |
3328 | if ((insn & 0x0df0f000) == 0x0080d000) | |
3329 | /* ADD SP (register or immediate). */ | |
3330 | found_stack_adjust = 1; | |
3331 | else if ((insn & 0x0df0f000) == 0x0040d000) | |
3332 | /* SUB SP (register or immediate). */ | |
3333 | found_stack_adjust = 1; | |
3334 | else if ((insn & 0x0ffffff0) == 0x01a0d000) | |
3335 | /* MOV SP. */ | |
77bc0675 | 3336 | found_stack_adjust = 1; |
4024ca99 UW |
3337 | else if ((insn & 0x0fff0000) == 0x08bd0000) |
3338 | /* POP (LDMIA). */ | |
3339 | found_stack_adjust = 1; | |
fc51cce1 MGD |
3340 | else if ((insn & 0x0fff0000) == 0x049d0000) |
3341 | /* POP of a single register. */ | |
3342 | found_stack_adjust = 1; | |
4024ca99 UW |
3343 | } |
3344 | ||
3345 | if (found_stack_adjust) | |
3346 | return 1; | |
3347 | ||
3348 | return 0; | |
3349 | } | |
3350 | ||
3351 | ||
2dd604e7 RE |
3352 | /* When arguments must be pushed onto the stack, they go on in reverse |
3353 | order. The code below implements a FILO (stack) to do this. */ | |
3354 | ||
3355 | struct stack_item | |
3356 | { | |
3357 | int len; | |
3358 | struct stack_item *prev; | |
3359 | void *data; | |
3360 | }; | |
3361 | ||
3362 | static struct stack_item * | |
8c6363cf | 3363 | push_stack_item (struct stack_item *prev, const void *contents, int len) |
2dd604e7 RE |
3364 | { |
3365 | struct stack_item *si; | |
3366 | si = xmalloc (sizeof (struct stack_item)); | |
226c7fbc | 3367 | si->data = xmalloc (len); |
2dd604e7 RE |
3368 | si->len = len; |
3369 | si->prev = prev; | |
3370 | memcpy (si->data, contents, len); | |
3371 | return si; | |
3372 | } | |
3373 | ||
3374 | static struct stack_item * | |
3375 | pop_stack_item (struct stack_item *si) | |
3376 | { | |
3377 | struct stack_item *dead = si; | |
3378 | si = si->prev; | |
3379 | xfree (dead->data); | |
3380 | xfree (dead); | |
3381 | return si; | |
3382 | } | |
3383 | ||
2af48f68 PB |
3384 | |
3385 | /* Return the alignment (in bytes) of the given type. */ | |
3386 | ||
3387 | static int | |
3388 | arm_type_align (struct type *t) | |
3389 | { | |
3390 | int n; | |
3391 | int align; | |
3392 | int falign; | |
3393 | ||
3394 | t = check_typedef (t); | |
3395 | switch (TYPE_CODE (t)) | |
3396 | { | |
3397 | default: | |
3398 | /* Should never happen. */ | |
3399 | internal_error (__FILE__, __LINE__, _("unknown type alignment")); | |
3400 | return 4; | |
3401 | ||
3402 | case TYPE_CODE_PTR: | |
3403 | case TYPE_CODE_ENUM: | |
3404 | case TYPE_CODE_INT: | |
3405 | case TYPE_CODE_FLT: | |
3406 | case TYPE_CODE_SET: | |
3407 | case TYPE_CODE_RANGE: | |
2af48f68 PB |
3408 | case TYPE_CODE_REF: |
3409 | case TYPE_CODE_CHAR: | |
3410 | case TYPE_CODE_BOOL: | |
3411 | return TYPE_LENGTH (t); | |
3412 | ||
3413 | case TYPE_CODE_ARRAY: | |
3414 | case TYPE_CODE_COMPLEX: | |
3415 | /* TODO: What about vector types? */ | |
3416 | return arm_type_align (TYPE_TARGET_TYPE (t)); | |
3417 | ||
3418 | case TYPE_CODE_STRUCT: | |
3419 | case TYPE_CODE_UNION: | |
3420 | align = 1; | |
3421 | for (n = 0; n < TYPE_NFIELDS (t); n++) | |
3422 | { | |
3423 | falign = arm_type_align (TYPE_FIELD_TYPE (t, n)); | |
3424 | if (falign > align) | |
3425 | align = falign; | |
3426 | } | |
3427 | return align; | |
3428 | } | |
3429 | } | |
3430 | ||
90445bd3 DJ |
3431 | /* Possible base types for a candidate for passing and returning in |
3432 | VFP registers. */ | |
3433 | ||
3434 | enum arm_vfp_cprc_base_type | |
3435 | { | |
3436 | VFP_CPRC_UNKNOWN, | |
3437 | VFP_CPRC_SINGLE, | |
3438 | VFP_CPRC_DOUBLE, | |
3439 | VFP_CPRC_VEC64, | |
3440 | VFP_CPRC_VEC128 | |
3441 | }; | |
3442 | ||
3443 | /* The length of one element of base type B. */ | |
3444 | ||
3445 | static unsigned | |
3446 | arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b) | |
3447 | { | |
3448 | switch (b) | |
3449 | { | |
3450 | case VFP_CPRC_SINGLE: | |
3451 | return 4; | |
3452 | case VFP_CPRC_DOUBLE: | |
3453 | return 8; | |
3454 | case VFP_CPRC_VEC64: | |
3455 | return 8; | |
3456 | case VFP_CPRC_VEC128: | |
3457 | return 16; | |
3458 | default: | |
3459 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3460 | (int) b); | |
3461 | } | |
3462 | } | |
3463 | ||
3464 | /* The character ('s', 'd' or 'q') for the type of VFP register used | |
3465 | for passing base type B. */ | |
3466 | ||
3467 | static int | |
3468 | arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b) | |
3469 | { | |
3470 | switch (b) | |
3471 | { | |
3472 | case VFP_CPRC_SINGLE: | |
3473 | return 's'; | |
3474 | case VFP_CPRC_DOUBLE: | |
3475 | return 'd'; | |
3476 | case VFP_CPRC_VEC64: | |
3477 | return 'd'; | |
3478 | case VFP_CPRC_VEC128: | |
3479 | return 'q'; | |
3480 | default: | |
3481 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3482 | (int) b); | |
3483 | } | |
3484 | } | |
3485 | ||
3486 | /* Determine whether T may be part of a candidate for passing and | |
3487 | returning in VFP registers, ignoring the limit on the total number | |
3488 | of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the | |
3489 | classification of the first valid component found; if it is not | |
3490 | VFP_CPRC_UNKNOWN, all components must have the same classification | |
3491 | as *BASE_TYPE. If it is found that T contains a type not permitted | |
3492 | for passing and returning in VFP registers, a type differently | |
3493 | classified from *BASE_TYPE, or two types differently classified | |
3494 | from each other, return -1, otherwise return the total number of | |
3495 | base-type elements found (possibly 0 in an empty structure or | |
3496 | array). Vectors and complex types are not currently supported, | |
3497 | matching the generic AAPCS support. */ | |
3498 | ||
3499 | static int | |
3500 | arm_vfp_cprc_sub_candidate (struct type *t, | |
3501 | enum arm_vfp_cprc_base_type *base_type) | |
3502 | { | |
3503 | t = check_typedef (t); | |
3504 | switch (TYPE_CODE (t)) | |
3505 | { | |
3506 | case TYPE_CODE_FLT: | |
3507 | switch (TYPE_LENGTH (t)) | |
3508 | { | |
3509 | case 4: | |
3510 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3511 | *base_type = VFP_CPRC_SINGLE; | |
3512 | else if (*base_type != VFP_CPRC_SINGLE) | |
3513 | return -1; | |
3514 | return 1; | |
3515 | ||
3516 | case 8: | |
3517 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3518 | *base_type = VFP_CPRC_DOUBLE; | |
3519 | else if (*base_type != VFP_CPRC_DOUBLE) | |
3520 | return -1; | |
3521 | return 1; | |
3522 | ||
3523 | default: | |
3524 | return -1; | |
3525 | } | |
3526 | break; | |
3527 | ||
3528 | case TYPE_CODE_ARRAY: | |
3529 | { | |
3530 | int count; | |
3531 | unsigned unitlen; | |
3532 | count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type); | |
3533 | if (count == -1) | |
3534 | return -1; | |
3535 | if (TYPE_LENGTH (t) == 0) | |
3536 | { | |
3537 | gdb_assert (count == 0); | |
3538 | return 0; | |
3539 | } | |
3540 | else if (count == 0) | |
3541 | return -1; | |
3542 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3543 | gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0); | |
3544 | return TYPE_LENGTH (t) / unitlen; | |
3545 | } | |
3546 | break; | |
3547 | ||
3548 | case TYPE_CODE_STRUCT: | |
3549 | { | |
3550 | int count = 0; | |
3551 | unsigned unitlen; | |
3552 | int i; | |
3553 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3554 | { | |
3555 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3556 | base_type); | |
3557 | if (sub_count == -1) | |
3558 | return -1; | |
3559 | count += sub_count; | |
3560 | } | |
3561 | if (TYPE_LENGTH (t) == 0) | |
3562 | { | |
3563 | gdb_assert (count == 0); | |
3564 | return 0; | |
3565 | } | |
3566 | else if (count == 0) | |
3567 | return -1; | |
3568 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3569 | if (TYPE_LENGTH (t) != unitlen * count) | |
3570 | return -1; | |
3571 | return count; | |
3572 | } | |
3573 | ||
3574 | case TYPE_CODE_UNION: | |
3575 | { | |
3576 | int count = 0; | |
3577 | unsigned unitlen; | |
3578 | int i; | |
3579 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3580 | { | |
3581 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3582 | base_type); | |
3583 | if (sub_count == -1) | |
3584 | return -1; | |
3585 | count = (count > sub_count ? count : sub_count); | |
3586 | } | |
3587 | if (TYPE_LENGTH (t) == 0) | |
3588 | { | |
3589 | gdb_assert (count == 0); | |
3590 | return 0; | |
3591 | } | |
3592 | else if (count == 0) | |
3593 | return -1; | |
3594 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3595 | if (TYPE_LENGTH (t) != unitlen * count) | |
3596 | return -1; | |
3597 | return count; | |
3598 | } | |
3599 | ||
3600 | default: | |
3601 | break; | |
3602 | } | |
3603 | ||
3604 | return -1; | |
3605 | } | |
3606 | ||
3607 | /* Determine whether T is a VFP co-processor register candidate (CPRC) | |
3608 | if passed to or returned from a non-variadic function with the VFP | |
3609 | ABI in effect. Return 1 if it is, 0 otherwise. If it is, set | |
3610 | *BASE_TYPE to the base type for T and *COUNT to the number of | |
3611 | elements of that base type before returning. */ | |
3612 | ||
3613 | static int | |
3614 | arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type, | |
3615 | int *count) | |
3616 | { | |
3617 | enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN; | |
3618 | int c = arm_vfp_cprc_sub_candidate (t, &b); | |
3619 | if (c <= 0 || c > 4) | |
3620 | return 0; | |
3621 | *base_type = b; | |
3622 | *count = c; | |
3623 | return 1; | |
3624 | } | |
3625 | ||
3626 | /* Return 1 if the VFP ABI should be used for passing arguments to and | |
3627 | returning values from a function of type FUNC_TYPE, 0 | |
3628 | otherwise. */ | |
3629 | ||
3630 | static int | |
3631 | arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type) | |
3632 | { | |
3633 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3634 | /* Variadic functions always use the base ABI. Assume that functions | |
3635 | without debug info are not variadic. */ | |
3636 | if (func_type && TYPE_VARARGS (check_typedef (func_type))) | |
3637 | return 0; | |
3638 | /* The VFP ABI is only supported as a variant of AAPCS. */ | |
3639 | if (tdep->arm_abi != ARM_ABI_AAPCS) | |
3640 | return 0; | |
3641 | return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP; | |
3642 | } | |
3643 | ||
3644 | /* We currently only support passing parameters in integer registers, which | |
3645 | conforms with GCC's default model, and VFP argument passing following | |
3646 | the VFP variant of AAPCS. Several other variants exist and | |
2dd604e7 RE |
3647 | we should probably support some of them based on the selected ABI. */ |
3648 | ||
3649 | static CORE_ADDR | |
7d9b040b | 3650 | arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
6a65450a AC |
3651 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
3652 | struct value **args, CORE_ADDR sp, int struct_return, | |
3653 | CORE_ADDR struct_addr) | |
2dd604e7 | 3654 | { |
e17a4113 | 3655 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
2dd604e7 RE |
3656 | int argnum; |
3657 | int argreg; | |
3658 | int nstack; | |
3659 | struct stack_item *si = NULL; | |
90445bd3 DJ |
3660 | int use_vfp_abi; |
3661 | struct type *ftype; | |
3662 | unsigned vfp_regs_free = (1 << 16) - 1; | |
3663 | ||
3664 | /* Determine the type of this function and whether the VFP ABI | |
3665 | applies. */ | |
3666 | ftype = check_typedef (value_type (function)); | |
3667 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
3668 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
3669 | use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype); | |
2dd604e7 | 3670 | |
6a65450a AC |
3671 | /* Set the return address. For the ARM, the return breakpoint is |
3672 | always at BP_ADDR. */ | |
9779414d | 3673 | if (arm_pc_is_thumb (gdbarch, bp_addr)) |
9dca5578 | 3674 | bp_addr |= 1; |
6a65450a | 3675 | regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr); |
2dd604e7 RE |
3676 | |
3677 | /* Walk through the list of args and determine how large a temporary | |
3678 | stack is required. Need to take care here as structs may be | |
7a9dd1b2 | 3679 | passed on the stack, and we have to push them. */ |
2dd604e7 RE |
3680 | nstack = 0; |
3681 | ||
3682 | argreg = ARM_A1_REGNUM; | |
3683 | nstack = 0; | |
3684 | ||
2dd604e7 RE |
3685 | /* The struct_return pointer occupies the first parameter |
3686 | passing register. */ | |
3687 | if (struct_return) | |
3688 | { | |
3689 | if (arm_debug) | |
5af949e3 | 3690 | fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n", |
2af46ca0 | 3691 | gdbarch_register_name (gdbarch, argreg), |
5af949e3 | 3692 | paddress (gdbarch, struct_addr)); |
2dd604e7 RE |
3693 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
3694 | argreg++; | |
3695 | } | |
3696 | ||
3697 | for (argnum = 0; argnum < nargs; argnum++) | |
3698 | { | |
3699 | int len; | |
3700 | struct type *arg_type; | |
3701 | struct type *target_type; | |
3702 | enum type_code typecode; | |
8c6363cf | 3703 | const bfd_byte *val; |
2af48f68 | 3704 | int align; |
90445bd3 DJ |
3705 | enum arm_vfp_cprc_base_type vfp_base_type; |
3706 | int vfp_base_count; | |
3707 | int may_use_core_reg = 1; | |
2dd604e7 | 3708 | |
df407dfe | 3709 | arg_type = check_typedef (value_type (args[argnum])); |
2dd604e7 RE |
3710 | len = TYPE_LENGTH (arg_type); |
3711 | target_type = TYPE_TARGET_TYPE (arg_type); | |
3712 | typecode = TYPE_CODE (arg_type); | |
8c6363cf | 3713 | val = value_contents (args[argnum]); |
2dd604e7 | 3714 | |
2af48f68 PB |
3715 | align = arm_type_align (arg_type); |
3716 | /* Round alignment up to a whole number of words. */ | |
3717 | align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1); | |
3718 | /* Different ABIs have different maximum alignments. */ | |
3719 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS) | |
3720 | { | |
3721 | /* The APCS ABI only requires word alignment. */ | |
3722 | align = INT_REGISTER_SIZE; | |
3723 | } | |
3724 | else | |
3725 | { | |
3726 | /* The AAPCS requires at most doubleword alignment. */ | |
3727 | if (align > INT_REGISTER_SIZE * 2) | |
3728 | align = INT_REGISTER_SIZE * 2; | |
3729 | } | |
3730 | ||
90445bd3 DJ |
3731 | if (use_vfp_abi |
3732 | && arm_vfp_call_candidate (arg_type, &vfp_base_type, | |
3733 | &vfp_base_count)) | |
3734 | { | |
3735 | int regno; | |
3736 | int unit_length; | |
3737 | int shift; | |
3738 | unsigned mask; | |
3739 | ||
3740 | /* Because this is a CPRC it cannot go in a core register or | |
3741 | cause a core register to be skipped for alignment. | |
3742 | Either it goes in VFP registers and the rest of this loop | |
3743 | iteration is skipped for this argument, or it goes on the | |
3744 | stack (and the stack alignment code is correct for this | |
3745 | case). */ | |
3746 | may_use_core_reg = 0; | |
3747 | ||
3748 | unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
3749 | shift = unit_length / 4; | |
3750 | mask = (1 << (shift * vfp_base_count)) - 1; | |
3751 | for (regno = 0; regno < 16; regno += shift) | |
3752 | if (((vfp_regs_free >> regno) & mask) == mask) | |
3753 | break; | |
3754 | ||
3755 | if (regno < 16) | |
3756 | { | |
3757 | int reg_char; | |
3758 | int reg_scaled; | |
3759 | int i; | |
3760 | ||
3761 | vfp_regs_free &= ~(mask << regno); | |
3762 | reg_scaled = regno / shift; | |
3763 | reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
3764 | for (i = 0; i < vfp_base_count; i++) | |
3765 | { | |
3766 | char name_buf[4]; | |
3767 | int regnum; | |
58d6951d DJ |
3768 | if (reg_char == 'q') |
3769 | arm_neon_quad_write (gdbarch, regcache, reg_scaled + i, | |
90445bd3 | 3770 | val + i * unit_length); |
58d6951d DJ |
3771 | else |
3772 | { | |
8c042590 PM |
3773 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", |
3774 | reg_char, reg_scaled + i); | |
58d6951d DJ |
3775 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
3776 | strlen (name_buf)); | |
3777 | regcache_cooked_write (regcache, regnum, | |
3778 | val + i * unit_length); | |
3779 | } | |
90445bd3 DJ |
3780 | } |
3781 | continue; | |
3782 | } | |
3783 | else | |
3784 | { | |
3785 | /* This CPRC could not go in VFP registers, so all VFP | |
3786 | registers are now marked as used. */ | |
3787 | vfp_regs_free = 0; | |
3788 | } | |
3789 | } | |
3790 | ||
2af48f68 PB |
3791 | /* Push stack padding for dowubleword alignment. */ |
3792 | if (nstack & (align - 1)) | |
3793 | { | |
3794 | si = push_stack_item (si, val, INT_REGISTER_SIZE); | |
3795 | nstack += INT_REGISTER_SIZE; | |
3796 | } | |
3797 | ||
3798 | /* Doubleword aligned quantities must go in even register pairs. */ | |
90445bd3 DJ |
3799 | if (may_use_core_reg |
3800 | && argreg <= ARM_LAST_ARG_REGNUM | |
2af48f68 PB |
3801 | && align > INT_REGISTER_SIZE |
3802 | && argreg & 1) | |
3803 | argreg++; | |
3804 | ||
2dd604e7 RE |
3805 | /* If the argument is a pointer to a function, and it is a |
3806 | Thumb function, create a LOCAL copy of the value and set | |
3807 | the THUMB bit in it. */ | |
3808 | if (TYPE_CODE_PTR == typecode | |
3809 | && target_type != NULL | |
f96b8fa0 | 3810 | && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type))) |
2dd604e7 | 3811 | { |
e17a4113 | 3812 | CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order); |
9779414d | 3813 | if (arm_pc_is_thumb (gdbarch, regval)) |
2dd604e7 | 3814 | { |
8c6363cf TT |
3815 | bfd_byte *copy = alloca (len); |
3816 | store_unsigned_integer (copy, len, byte_order, | |
e17a4113 | 3817 | MAKE_THUMB_ADDR (regval)); |
8c6363cf | 3818 | val = copy; |
2dd604e7 RE |
3819 | } |
3820 | } | |
3821 | ||
3822 | /* Copy the argument to general registers or the stack in | |
3823 | register-sized pieces. Large arguments are split between | |
3824 | registers and stack. */ | |
3825 | while (len > 0) | |
3826 | { | |
f0c9063c | 3827 | int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE; |
2dd604e7 | 3828 | |
90445bd3 | 3829 | if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM) |
2dd604e7 RE |
3830 | { |
3831 | /* The argument is being passed in a general purpose | |
3832 | register. */ | |
e17a4113 UW |
3833 | CORE_ADDR regval |
3834 | = extract_unsigned_integer (val, partial_len, byte_order); | |
3835 | if (byte_order == BFD_ENDIAN_BIG) | |
8bf8793c | 3836 | regval <<= (INT_REGISTER_SIZE - partial_len) * 8; |
2dd604e7 RE |
3837 | if (arm_debug) |
3838 | fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", | |
c9f4d572 UW |
3839 | argnum, |
3840 | gdbarch_register_name | |
2af46ca0 | 3841 | (gdbarch, argreg), |
f0c9063c | 3842 | phex (regval, INT_REGISTER_SIZE)); |
2dd604e7 RE |
3843 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
3844 | argreg++; | |
3845 | } | |
3846 | else | |
3847 | { | |
3848 | /* Push the arguments onto the stack. */ | |
3849 | if (arm_debug) | |
3850 | fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n", | |
3851 | argnum, nstack); | |
f0c9063c UW |
3852 | si = push_stack_item (si, val, INT_REGISTER_SIZE); |
3853 | nstack += INT_REGISTER_SIZE; | |
2dd604e7 RE |
3854 | } |
3855 | ||
3856 | len -= partial_len; | |
3857 | val += partial_len; | |
3858 | } | |
3859 | } | |
3860 | /* If we have an odd number of words to push, then decrement the stack | |
3861 | by one word now, so first stack argument will be dword aligned. */ | |
3862 | if (nstack & 4) | |
3863 | sp -= 4; | |
3864 | ||
3865 | while (si) | |
3866 | { | |
3867 | sp -= si->len; | |
3868 | write_memory (sp, si->data, si->len); | |
3869 | si = pop_stack_item (si); | |
3870 | } | |
3871 | ||
3872 | /* Finally, update teh SP register. */ | |
3873 | regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp); | |
3874 | ||
3875 | return sp; | |
3876 | } | |
3877 | ||
f53f0d0b PB |
3878 | |
3879 | /* Always align the frame to an 8-byte boundary. This is required on | |
3880 | some platforms and harmless on the rest. */ | |
3881 | ||
3882 | static CORE_ADDR | |
3883 | arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
3884 | { | |
3885 | /* Align the stack to eight bytes. */ | |
3886 | return sp & ~ (CORE_ADDR) 7; | |
3887 | } | |
3888 | ||
c906108c | 3889 | static void |
ed9a39eb | 3890 | print_fpu_flags (int flags) |
c906108c | 3891 | { |
c5aa993b JM |
3892 | if (flags & (1 << 0)) |
3893 | fputs ("IVO ", stdout); | |
3894 | if (flags & (1 << 1)) | |
3895 | fputs ("DVZ ", stdout); | |
3896 | if (flags & (1 << 2)) | |
3897 | fputs ("OFL ", stdout); | |
3898 | if (flags & (1 << 3)) | |
3899 | fputs ("UFL ", stdout); | |
3900 | if (flags & (1 << 4)) | |
3901 | fputs ("INX ", stdout); | |
3902 | putchar ('\n'); | |
c906108c SS |
3903 | } |
3904 | ||
5e74b15c RE |
3905 | /* Print interesting information about the floating point processor |
3906 | (if present) or emulator. */ | |
34e8f22d | 3907 | static void |
d855c300 | 3908 | arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
23e3a7ac | 3909 | struct frame_info *frame, const char *args) |
c906108c | 3910 | { |
9c9acae0 | 3911 | unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM); |
c5aa993b JM |
3912 | int type; |
3913 | ||
3914 | type = (status >> 24) & 127; | |
edefbb7c AC |
3915 | if (status & (1 << 31)) |
3916 | printf (_("Hardware FPU type %d\n"), type); | |
3917 | else | |
3918 | printf (_("Software FPU type %d\n"), type); | |
3919 | /* i18n: [floating point unit] mask */ | |
3920 | fputs (_("mask: "), stdout); | |
c5aa993b | 3921 | print_fpu_flags (status >> 16); |
edefbb7c AC |
3922 | /* i18n: [floating point unit] flags */ |
3923 | fputs (_("flags: "), stdout); | |
c5aa993b | 3924 | print_fpu_flags (status); |
c906108c SS |
3925 | } |
3926 | ||
27067745 UW |
3927 | /* Construct the ARM extended floating point type. */ |
3928 | static struct type * | |
3929 | arm_ext_type (struct gdbarch *gdbarch) | |
3930 | { | |
3931 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3932 | ||
3933 | if (!tdep->arm_ext_type) | |
3934 | tdep->arm_ext_type | |
e9bb382b | 3935 | = arch_float_type (gdbarch, -1, "builtin_type_arm_ext", |
27067745 UW |
3936 | floatformats_arm_ext); |
3937 | ||
3938 | return tdep->arm_ext_type; | |
3939 | } | |
3940 | ||
58d6951d DJ |
3941 | static struct type * |
3942 | arm_neon_double_type (struct gdbarch *gdbarch) | |
3943 | { | |
3944 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3945 | ||
3946 | if (tdep->neon_double_type == NULL) | |
3947 | { | |
3948 | struct type *t, *elem; | |
3949 | ||
3950 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d", | |
3951 | TYPE_CODE_UNION); | |
3952 | elem = builtin_type (gdbarch)->builtin_uint8; | |
3953 | append_composite_type_field (t, "u8", init_vector_type (elem, 8)); | |
3954 | elem = builtin_type (gdbarch)->builtin_uint16; | |
3955 | append_composite_type_field (t, "u16", init_vector_type (elem, 4)); | |
3956 | elem = builtin_type (gdbarch)->builtin_uint32; | |
3957 | append_composite_type_field (t, "u32", init_vector_type (elem, 2)); | |
3958 | elem = builtin_type (gdbarch)->builtin_uint64; | |
3959 | append_composite_type_field (t, "u64", elem); | |
3960 | elem = builtin_type (gdbarch)->builtin_float; | |
3961 | append_composite_type_field (t, "f32", init_vector_type (elem, 2)); | |
3962 | elem = builtin_type (gdbarch)->builtin_double; | |
3963 | append_composite_type_field (t, "f64", elem); | |
3964 | ||
3965 | TYPE_VECTOR (t) = 1; | |
3966 | TYPE_NAME (t) = "neon_d"; | |
3967 | tdep->neon_double_type = t; | |
3968 | } | |
3969 | ||
3970 | return tdep->neon_double_type; | |
3971 | } | |
3972 | ||
3973 | /* FIXME: The vector types are not correctly ordered on big-endian | |
3974 | targets. Just as s0 is the low bits of d0, d0[0] is also the low | |
3975 | bits of d0 - regardless of what unit size is being held in d0. So | |
3976 | the offset of the first uint8 in d0 is 7, but the offset of the | |
3977 | first float is 4. This code works as-is for little-endian | |
3978 | targets. */ | |
3979 | ||
3980 | static struct type * | |
3981 | arm_neon_quad_type (struct gdbarch *gdbarch) | |
3982 | { | |
3983 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3984 | ||
3985 | if (tdep->neon_quad_type == NULL) | |
3986 | { | |
3987 | struct type *t, *elem; | |
3988 | ||
3989 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q", | |
3990 | TYPE_CODE_UNION); | |
3991 | elem = builtin_type (gdbarch)->builtin_uint8; | |
3992 | append_composite_type_field (t, "u8", init_vector_type (elem, 16)); | |
3993 | elem = builtin_type (gdbarch)->builtin_uint16; | |
3994 | append_composite_type_field (t, "u16", init_vector_type (elem, 8)); | |
3995 | elem = builtin_type (gdbarch)->builtin_uint32; | |
3996 | append_composite_type_field (t, "u32", init_vector_type (elem, 4)); | |
3997 | elem = builtin_type (gdbarch)->builtin_uint64; | |
3998 | append_composite_type_field (t, "u64", init_vector_type (elem, 2)); | |
3999 | elem = builtin_type (gdbarch)->builtin_float; | |
4000 | append_composite_type_field (t, "f32", init_vector_type (elem, 4)); | |
4001 | elem = builtin_type (gdbarch)->builtin_double; | |
4002 | append_composite_type_field (t, "f64", init_vector_type (elem, 2)); | |
4003 | ||
4004 | TYPE_VECTOR (t) = 1; | |
4005 | TYPE_NAME (t) = "neon_q"; | |
4006 | tdep->neon_quad_type = t; | |
4007 | } | |
4008 | ||
4009 | return tdep->neon_quad_type; | |
4010 | } | |
4011 | ||
34e8f22d RE |
4012 | /* Return the GDB type object for the "standard" data type of data in |
4013 | register N. */ | |
4014 | ||
4015 | static struct type * | |
7a5ea0d4 | 4016 | arm_register_type (struct gdbarch *gdbarch, int regnum) |
032758dc | 4017 | { |
58d6951d DJ |
4018 | int num_regs = gdbarch_num_regs (gdbarch); |
4019 | ||
4020 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
4021 | && regnum >= num_regs && regnum < num_regs + 32) | |
4022 | return builtin_type (gdbarch)->builtin_float; | |
4023 | ||
4024 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
4025 | && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16) | |
4026 | return arm_neon_quad_type (gdbarch); | |
4027 | ||
4028 | /* If the target description has register information, we are only | |
4029 | in this function so that we can override the types of | |
4030 | double-precision registers for NEON. */ | |
4031 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
4032 | { | |
4033 | struct type *t = tdesc_register_type (gdbarch, regnum); | |
4034 | ||
4035 | if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32 | |
4036 | && TYPE_CODE (t) == TYPE_CODE_FLT | |
4037 | && gdbarch_tdep (gdbarch)->have_neon) | |
4038 | return arm_neon_double_type (gdbarch); | |
4039 | else | |
4040 | return t; | |
4041 | } | |
4042 | ||
34e8f22d | 4043 | if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS) |
58d6951d DJ |
4044 | { |
4045 | if (!gdbarch_tdep (gdbarch)->have_fpa_registers) | |
4046 | return builtin_type (gdbarch)->builtin_void; | |
4047 | ||
4048 | return arm_ext_type (gdbarch); | |
4049 | } | |
e4c16157 | 4050 | else if (regnum == ARM_SP_REGNUM) |
0dfff4cb | 4051 | return builtin_type (gdbarch)->builtin_data_ptr; |
e4c16157 | 4052 | else if (regnum == ARM_PC_REGNUM) |
0dfff4cb | 4053 | return builtin_type (gdbarch)->builtin_func_ptr; |
ff6f572f DJ |
4054 | else if (regnum >= ARRAY_SIZE (arm_register_names)) |
4055 | /* These registers are only supported on targets which supply | |
4056 | an XML description. */ | |
df4df182 | 4057 | return builtin_type (gdbarch)->builtin_int0; |
032758dc | 4058 | else |
df4df182 | 4059 | return builtin_type (gdbarch)->builtin_uint32; |
032758dc AC |
4060 | } |
4061 | ||
ff6f572f DJ |
4062 | /* Map a DWARF register REGNUM onto the appropriate GDB register |
4063 | number. */ | |
4064 | ||
4065 | static int | |
d3f73121 | 4066 | arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
ff6f572f DJ |
4067 | { |
4068 | /* Core integer regs. */ | |
4069 | if (reg >= 0 && reg <= 15) | |
4070 | return reg; | |
4071 | ||
4072 | /* Legacy FPA encoding. These were once used in a way which | |
4073 | overlapped with VFP register numbering, so their use is | |
4074 | discouraged, but GDB doesn't support the ARM toolchain | |
4075 | which used them for VFP. */ | |
4076 | if (reg >= 16 && reg <= 23) | |
4077 | return ARM_F0_REGNUM + reg - 16; | |
4078 | ||
4079 | /* New assignments for the FPA registers. */ | |
4080 | if (reg >= 96 && reg <= 103) | |
4081 | return ARM_F0_REGNUM + reg - 96; | |
4082 | ||
4083 | /* WMMX register assignments. */ | |
4084 | if (reg >= 104 && reg <= 111) | |
4085 | return ARM_WCGR0_REGNUM + reg - 104; | |
4086 | ||
4087 | if (reg >= 112 && reg <= 127) | |
4088 | return ARM_WR0_REGNUM + reg - 112; | |
4089 | ||
4090 | if (reg >= 192 && reg <= 199) | |
4091 | return ARM_WC0_REGNUM + reg - 192; | |
4092 | ||
58d6951d DJ |
4093 | /* VFP v2 registers. A double precision value is actually |
4094 | in d1 rather than s2, but the ABI only defines numbering | |
4095 | for the single precision registers. This will "just work" | |
4096 | in GDB for little endian targets (we'll read eight bytes, | |
4097 | starting in s0 and then progressing to s1), but will be | |
4098 | reversed on big endian targets with VFP. This won't | |
4099 | be a problem for the new Neon quad registers; you're supposed | |
4100 | to use DW_OP_piece for those. */ | |
4101 | if (reg >= 64 && reg <= 95) | |
4102 | { | |
4103 | char name_buf[4]; | |
4104 | ||
8c042590 | 4105 | xsnprintf (name_buf, sizeof (name_buf), "s%d", reg - 64); |
58d6951d DJ |
4106 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4107 | strlen (name_buf)); | |
4108 | } | |
4109 | ||
4110 | /* VFP v3 / Neon registers. This range is also used for VFP v2 | |
4111 | registers, except that it now describes d0 instead of s0. */ | |
4112 | if (reg >= 256 && reg <= 287) | |
4113 | { | |
4114 | char name_buf[4]; | |
4115 | ||
8c042590 | 4116 | xsnprintf (name_buf, sizeof (name_buf), "d%d", reg - 256); |
58d6951d DJ |
4117 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
4118 | strlen (name_buf)); | |
4119 | } | |
4120 | ||
ff6f572f DJ |
4121 | return -1; |
4122 | } | |
4123 | ||
26216b98 AC |
4124 | /* Map GDB internal REGNUM onto the Arm simulator register numbers. */ |
4125 | static int | |
e7faf938 | 4126 | arm_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
26216b98 AC |
4127 | { |
4128 | int reg = regnum; | |
e7faf938 | 4129 | gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch)); |
26216b98 | 4130 | |
ff6f572f DJ |
4131 | if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM) |
4132 | return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM; | |
4133 | ||
4134 | if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM) | |
4135 | return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM; | |
4136 | ||
4137 | if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM) | |
4138 | return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM; | |
4139 | ||
26216b98 AC |
4140 | if (reg < NUM_GREGS) |
4141 | return SIM_ARM_R0_REGNUM + reg; | |
4142 | reg -= NUM_GREGS; | |
4143 | ||
4144 | if (reg < NUM_FREGS) | |
4145 | return SIM_ARM_FP0_REGNUM + reg; | |
4146 | reg -= NUM_FREGS; | |
4147 | ||
4148 | if (reg < NUM_SREGS) | |
4149 | return SIM_ARM_FPS_REGNUM + reg; | |
4150 | reg -= NUM_SREGS; | |
4151 | ||
edefbb7c | 4152 | internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum); |
26216b98 | 4153 | } |
34e8f22d | 4154 | |
a37b3cc0 AC |
4155 | /* NOTE: cagney/2001-08-20: Both convert_from_extended() and |
4156 | convert_to_extended() use floatformat_arm_ext_littlebyte_bigword. | |
4157 | It is thought that this is is the floating-point register format on | |
4158 | little-endian systems. */ | |
c906108c | 4159 | |
ed9a39eb | 4160 | static void |
b508a996 | 4161 | convert_from_extended (const struct floatformat *fmt, const void *ptr, |
be8626e0 | 4162 | void *dbl, int endianess) |
c906108c | 4163 | { |
a37b3cc0 | 4164 | DOUBLEST d; |
be8626e0 MD |
4165 | |
4166 | if (endianess == BFD_ENDIAN_BIG) | |
a37b3cc0 AC |
4167 | floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d); |
4168 | else | |
4169 | floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4170 | ptr, &d); | |
b508a996 | 4171 | floatformat_from_doublest (fmt, &d, dbl); |
c906108c SS |
4172 | } |
4173 | ||
34e8f22d | 4174 | static void |
be8626e0 MD |
4175 | convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr, |
4176 | int endianess) | |
c906108c | 4177 | { |
a37b3cc0 | 4178 | DOUBLEST d; |
be8626e0 | 4179 | |
b508a996 | 4180 | floatformat_to_doublest (fmt, ptr, &d); |
be8626e0 | 4181 | if (endianess == BFD_ENDIAN_BIG) |
a37b3cc0 AC |
4182 | floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl); |
4183 | else | |
4184 | floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4185 | &d, dbl); | |
c906108c | 4186 | } |
ed9a39eb | 4187 | |
c906108c | 4188 | static int |
ed9a39eb | 4189 | condition_true (unsigned long cond, unsigned long status_reg) |
c906108c SS |
4190 | { |
4191 | if (cond == INST_AL || cond == INST_NV) | |
4192 | return 1; | |
4193 | ||
4194 | switch (cond) | |
4195 | { | |
4196 | case INST_EQ: | |
4197 | return ((status_reg & FLAG_Z) != 0); | |
4198 | case INST_NE: | |
4199 | return ((status_reg & FLAG_Z) == 0); | |
4200 | case INST_CS: | |
4201 | return ((status_reg & FLAG_C) != 0); | |
4202 | case INST_CC: | |
4203 | return ((status_reg & FLAG_C) == 0); | |
4204 | case INST_MI: | |
4205 | return ((status_reg & FLAG_N) != 0); | |
4206 | case INST_PL: | |
4207 | return ((status_reg & FLAG_N) == 0); | |
4208 | case INST_VS: | |
4209 | return ((status_reg & FLAG_V) != 0); | |
4210 | case INST_VC: | |
4211 | return ((status_reg & FLAG_V) == 0); | |
4212 | case INST_HI: | |
4213 | return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C); | |
4214 | case INST_LS: | |
4215 | return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C); | |
4216 | case INST_GE: | |
4217 | return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)); | |
4218 | case INST_LT: | |
4219 | return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)); | |
4220 | case INST_GT: | |
f8bf5763 PM |
4221 | return (((status_reg & FLAG_Z) == 0) |
4222 | && (((status_reg & FLAG_N) == 0) | |
4223 | == ((status_reg & FLAG_V) == 0))); | |
c906108c | 4224 | case INST_LE: |
f8bf5763 PM |
4225 | return (((status_reg & FLAG_Z) != 0) |
4226 | || (((status_reg & FLAG_N) == 0) | |
4227 | != ((status_reg & FLAG_V) == 0))); | |
c906108c SS |
4228 | } |
4229 | return 1; | |
4230 | } | |
4231 | ||
c906108c | 4232 | static unsigned long |
0b1b3e42 UW |
4233 | shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry, |
4234 | unsigned long pc_val, unsigned long status_reg) | |
c906108c SS |
4235 | { |
4236 | unsigned long res, shift; | |
4237 | int rm = bits (inst, 0, 3); | |
4238 | unsigned long shifttype = bits (inst, 5, 6); | |
c5aa993b JM |
4239 | |
4240 | if (bit (inst, 4)) | |
c906108c SS |
4241 | { |
4242 | int rs = bits (inst, 8, 11); | |
0b1b3e42 UW |
4243 | shift = (rs == 15 ? pc_val + 8 |
4244 | : get_frame_register_unsigned (frame, rs)) & 0xFF; | |
c906108c SS |
4245 | } |
4246 | else | |
4247 | shift = bits (inst, 7, 11); | |
c5aa993b | 4248 | |
bf9f652a | 4249 | res = (rm == ARM_PC_REGNUM |
0d39a070 | 4250 | ? (pc_val + (bit (inst, 4) ? 12 : 8)) |
0b1b3e42 | 4251 | : get_frame_register_unsigned (frame, rm)); |
c906108c SS |
4252 | |
4253 | switch (shifttype) | |
4254 | { | |
c5aa993b | 4255 | case 0: /* LSL */ |
c906108c SS |
4256 | res = shift >= 32 ? 0 : res << shift; |
4257 | break; | |
c5aa993b JM |
4258 | |
4259 | case 1: /* LSR */ | |
c906108c SS |
4260 | res = shift >= 32 ? 0 : res >> shift; |
4261 | break; | |
4262 | ||
c5aa993b JM |
4263 | case 2: /* ASR */ |
4264 | if (shift >= 32) | |
4265 | shift = 31; | |
c906108c SS |
4266 | res = ((res & 0x80000000L) |
4267 | ? ~((~res) >> shift) : res >> shift); | |
4268 | break; | |
4269 | ||
c5aa993b | 4270 | case 3: /* ROR/RRX */ |
c906108c SS |
4271 | shift &= 31; |
4272 | if (shift == 0) | |
4273 | res = (res >> 1) | (carry ? 0x80000000L : 0); | |
4274 | else | |
c5aa993b | 4275 | res = (res >> shift) | (res << (32 - shift)); |
c906108c SS |
4276 | break; |
4277 | } | |
4278 | ||
4279 | return res & 0xffffffff; | |
4280 | } | |
4281 | ||
c906108c SS |
4282 | /* Return number of 1-bits in VAL. */ |
4283 | ||
4284 | static int | |
ed9a39eb | 4285 | bitcount (unsigned long val) |
c906108c SS |
4286 | { |
4287 | int nbits; | |
4288 | for (nbits = 0; val != 0; nbits++) | |
0963b4bd | 4289 | val &= val - 1; /* Delete rightmost 1-bit in val. */ |
c906108c SS |
4290 | return nbits; |
4291 | } | |
4292 | ||
177321bd DJ |
4293 | /* Return the size in bytes of the complete Thumb instruction whose |
4294 | first halfword is INST1. */ | |
4295 | ||
4296 | static int | |
4297 | thumb_insn_size (unsigned short inst1) | |
4298 | { | |
4299 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) | |
4300 | return 4; | |
4301 | else | |
4302 | return 2; | |
4303 | } | |
4304 | ||
4305 | static int | |
4306 | thumb_advance_itstate (unsigned int itstate) | |
4307 | { | |
4308 | /* Preserve IT[7:5], the first three bits of the condition. Shift | |
4309 | the upcoming condition flags left by one bit. */ | |
4310 | itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f); | |
4311 | ||
4312 | /* If we have finished the IT block, clear the state. */ | |
4313 | if ((itstate & 0x0f) == 0) | |
4314 | itstate = 0; | |
4315 | ||
4316 | return itstate; | |
4317 | } | |
4318 | ||
4319 | /* Find the next PC after the current instruction executes. In some | |
4320 | cases we can not statically determine the answer (see the IT state | |
4321 | handling in this function); in that case, a breakpoint may be | |
4322 | inserted in addition to the returned PC, which will be used to set | |
4323 | another breakpoint by our caller. */ | |
4324 | ||
ad527d2e | 4325 | static CORE_ADDR |
18819fa6 | 4326 | thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4327 | { |
2af46ca0 | 4328 | struct gdbarch *gdbarch = get_frame_arch (frame); |
177321bd | 4329 | struct address_space *aspace = get_frame_address_space (frame); |
e17a4113 UW |
4330 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4331 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c5aa993b | 4332 | unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */ |
e17a4113 | 4333 | unsigned short inst1; |
0963b4bd | 4334 | CORE_ADDR nextpc = pc + 2; /* Default is next instruction. */ |
c906108c | 4335 | unsigned long offset; |
177321bd | 4336 | ULONGEST status, itstate; |
c906108c | 4337 | |
50e98be4 DJ |
4338 | nextpc = MAKE_THUMB_ADDR (nextpc); |
4339 | pc_val = MAKE_THUMB_ADDR (pc_val); | |
4340 | ||
e17a4113 | 4341 | inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code); |
9d4fde75 | 4342 | |
9dca5578 DJ |
4343 | /* Thumb-2 conditional execution support. There are eight bits in |
4344 | the CPSR which describe conditional execution state. Once | |
4345 | reconstructed (they're in a funny order), the low five bits | |
4346 | describe the low bit of the condition for each instruction and | |
4347 | how many instructions remain. The high three bits describe the | |
4348 | base condition. One of the low four bits will be set if an IT | |
4349 | block is active. These bits read as zero on earlier | |
4350 | processors. */ | |
4351 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
177321bd | 4352 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); |
9dca5578 | 4353 | |
177321bd DJ |
4354 | /* If-Then handling. On GNU/Linux, where this routine is used, we |
4355 | use an undefined instruction as a breakpoint. Unlike BKPT, IT | |
4356 | can disable execution of the undefined instruction. So we might | |
4357 | miss the breakpoint if we set it on a skipped conditional | |
4358 | instruction. Because conditional instructions can change the | |
4359 | flags, affecting the execution of further instructions, we may | |
4360 | need to set two breakpoints. */ | |
9dca5578 | 4361 | |
177321bd DJ |
4362 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL) |
4363 | { | |
4364 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
4365 | { | |
4366 | /* An IT instruction. Because this instruction does not | |
4367 | modify the flags, we can accurately predict the next | |
4368 | executed instruction. */ | |
4369 | itstate = inst1 & 0x00ff; | |
4370 | pc += thumb_insn_size (inst1); | |
4371 | ||
4372 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4373 | { | |
0963b4bd MS |
4374 | inst1 = read_memory_unsigned_integer (pc, 2, |
4375 | byte_order_for_code); | |
177321bd DJ |
4376 | pc += thumb_insn_size (inst1); |
4377 | itstate = thumb_advance_itstate (itstate); | |
4378 | } | |
4379 | ||
50e98be4 | 4380 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4381 | } |
4382 | else if (itstate != 0) | |
4383 | { | |
4384 | /* We are in a conditional block. Check the condition. */ | |
4385 | if (! condition_true (itstate >> 4, status)) | |
4386 | { | |
4387 | /* Advance to the next executed instruction. */ | |
4388 | pc += thumb_insn_size (inst1); | |
4389 | itstate = thumb_advance_itstate (itstate); | |
4390 | ||
4391 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4392 | { | |
0963b4bd MS |
4393 | inst1 = read_memory_unsigned_integer (pc, 2, |
4394 | byte_order_for_code); | |
177321bd DJ |
4395 | pc += thumb_insn_size (inst1); |
4396 | itstate = thumb_advance_itstate (itstate); | |
4397 | } | |
4398 | ||
50e98be4 | 4399 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4400 | } |
4401 | else if ((itstate & 0x0f) == 0x08) | |
4402 | { | |
4403 | /* This is the last instruction of the conditional | |
4404 | block, and it is executed. We can handle it normally | |
4405 | because the following instruction is not conditional, | |
4406 | and we must handle it normally because it is | |
4407 | permitted to branch. Fall through. */ | |
4408 | } | |
4409 | else | |
4410 | { | |
4411 | int cond_negated; | |
4412 | ||
4413 | /* There are conditional instructions after this one. | |
4414 | If this instruction modifies the flags, then we can | |
4415 | not predict what the next executed instruction will | |
4416 | be. Fortunately, this instruction is architecturally | |
4417 | forbidden to branch; we know it will fall through. | |
4418 | Start by skipping past it. */ | |
4419 | pc += thumb_insn_size (inst1); | |
4420 | itstate = thumb_advance_itstate (itstate); | |
4421 | ||
4422 | /* Set a breakpoint on the following instruction. */ | |
4423 | gdb_assert ((itstate & 0x0f) != 0); | |
18819fa6 UW |
4424 | arm_insert_single_step_breakpoint (gdbarch, aspace, |
4425 | MAKE_THUMB_ADDR (pc)); | |
177321bd DJ |
4426 | cond_negated = (itstate >> 4) & 1; |
4427 | ||
4428 | /* Skip all following instructions with the same | |
4429 | condition. If there is a later instruction in the IT | |
4430 | block with the opposite condition, set the other | |
4431 | breakpoint there. If not, then set a breakpoint on | |
4432 | the instruction after the IT block. */ | |
4433 | do | |
4434 | { | |
0963b4bd MS |
4435 | inst1 = read_memory_unsigned_integer (pc, 2, |
4436 | byte_order_for_code); | |
177321bd DJ |
4437 | pc += thumb_insn_size (inst1); |
4438 | itstate = thumb_advance_itstate (itstate); | |
4439 | } | |
4440 | while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated); | |
4441 | ||
50e98be4 | 4442 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4443 | } |
4444 | } | |
4445 | } | |
4446 | else if (itstate & 0x0f) | |
9dca5578 DJ |
4447 | { |
4448 | /* We are in a conditional block. Check the condition. */ | |
177321bd | 4449 | int cond = itstate >> 4; |
9dca5578 DJ |
4450 | |
4451 | if (! condition_true (cond, status)) | |
db24da6d YQ |
4452 | /* Advance to the next instruction. All the 32-bit |
4453 | instructions share a common prefix. */ | |
4454 | return MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1)); | |
177321bd DJ |
4455 | |
4456 | /* Otherwise, handle the instruction normally. */ | |
9dca5578 DJ |
4457 | } |
4458 | ||
c906108c SS |
4459 | if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */ |
4460 | { | |
4461 | CORE_ADDR sp; | |
4462 | ||
4463 | /* Fetch the saved PC from the stack. It's stored above | |
4464 | all of the other registers. */ | |
f0c9063c | 4465 | offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE; |
0b1b3e42 | 4466 | sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM); |
e17a4113 | 4467 | nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order); |
c906108c SS |
4468 | } |
4469 | else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */ | |
4470 | { | |
c5aa993b | 4471 | unsigned long cond = bits (inst1, 8, 11); |
25b41d01 YQ |
4472 | if (cond == 0x0f) /* 0x0f = SWI */ |
4473 | { | |
4474 | struct gdbarch_tdep *tdep; | |
4475 | tdep = gdbarch_tdep (gdbarch); | |
4476 | ||
4477 | if (tdep->syscall_next_pc != NULL) | |
4478 | nextpc = tdep->syscall_next_pc (frame); | |
4479 | ||
4480 | } | |
4481 | else if (cond != 0x0f && condition_true (cond, status)) | |
c906108c SS |
4482 | nextpc = pc_val + (sbits (inst1, 0, 7) << 1); |
4483 | } | |
4484 | else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */ | |
4485 | { | |
4486 | nextpc = pc_val + (sbits (inst1, 0, 10) << 1); | |
4487 | } | |
db24da6d | 4488 | else if (thumb_insn_size (inst1) == 4) /* 32-bit instruction */ |
c906108c | 4489 | { |
e17a4113 UW |
4490 | unsigned short inst2; |
4491 | inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
9dca5578 DJ |
4492 | |
4493 | /* Default to the next instruction. */ | |
4494 | nextpc = pc + 4; | |
50e98be4 | 4495 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4496 | |
4497 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
4498 | { | |
4499 | /* Branches and miscellaneous control instructions. */ | |
4500 | ||
4501 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
4502 | { | |
4503 | /* B, BL, BLX. */ | |
4504 | int j1, j2, imm1, imm2; | |
4505 | ||
4506 | imm1 = sbits (inst1, 0, 10); | |
4507 | imm2 = bits (inst2, 0, 10); | |
4508 | j1 = bit (inst2, 13); | |
4509 | j2 = bit (inst2, 11); | |
4510 | ||
4511 | offset = ((imm1 << 12) + (imm2 << 1)); | |
4512 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
4513 | ||
4514 | nextpc = pc_val + offset; | |
4515 | /* For BLX make sure to clear the low bits. */ | |
4516 | if (bit (inst2, 12) == 0) | |
4517 | nextpc = nextpc & 0xfffffffc; | |
4518 | } | |
4519 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
4520 | { | |
4521 | /* SUBS PC, LR, #imm8. */ | |
4522 | nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM); | |
4523 | nextpc -= inst2 & 0x00ff; | |
4524 | } | |
4069ebbe | 4525 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) |
9dca5578 DJ |
4526 | { |
4527 | /* Conditional branch. */ | |
4528 | if (condition_true (bits (inst1, 6, 9), status)) | |
4529 | { | |
4530 | int sign, j1, j2, imm1, imm2; | |
4531 | ||
4532 | sign = sbits (inst1, 10, 10); | |
4533 | imm1 = bits (inst1, 0, 5); | |
4534 | imm2 = bits (inst2, 0, 10); | |
4535 | j1 = bit (inst2, 13); | |
4536 | j2 = bit (inst2, 11); | |
4537 | ||
4538 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
4539 | offset += (imm1 << 12) + (imm2 << 1); | |
4540 | ||
4541 | nextpc = pc_val + offset; | |
4542 | } | |
4543 | } | |
4544 | } | |
4545 | else if ((inst1 & 0xfe50) == 0xe810) | |
4546 | { | |
4547 | /* Load multiple or RFE. */ | |
4548 | int rn, offset, load_pc = 1; | |
4549 | ||
4550 | rn = bits (inst1, 0, 3); | |
4551 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
4552 | { | |
4553 | /* LDMIA or POP */ | |
4554 | if (!bit (inst2, 15)) | |
4555 | load_pc = 0; | |
4556 | offset = bitcount (inst2) * 4 - 4; | |
4557 | } | |
4558 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
4559 | { | |
4560 | /* LDMDB */ | |
4561 | if (!bit (inst2, 15)) | |
4562 | load_pc = 0; | |
4563 | offset = -4; | |
4564 | } | |
4565 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
4566 | { | |
4567 | /* RFEIA */ | |
4568 | offset = 0; | |
4569 | } | |
4570 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
4571 | { | |
4572 | /* RFEDB */ | |
4573 | offset = -8; | |
4574 | } | |
4575 | else | |
4576 | load_pc = 0; | |
4577 | ||
4578 | if (load_pc) | |
4579 | { | |
4580 | CORE_ADDR addr = get_frame_register_unsigned (frame, rn); | |
4581 | nextpc = get_frame_memory_unsigned (frame, addr + offset, 4); | |
4582 | } | |
4583 | } | |
4584 | else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
4585 | { | |
4586 | /* MOV PC or MOVS PC. */ | |
4587 | nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); | |
50e98be4 | 4588 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4589 | } |
4590 | else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
4591 | { | |
4592 | /* LDR PC. */ | |
4593 | CORE_ADDR base; | |
4594 | int rn, load_pc = 1; | |
4595 | ||
4596 | rn = bits (inst1, 0, 3); | |
4597 | base = get_frame_register_unsigned (frame, rn); | |
bf9f652a | 4598 | if (rn == ARM_PC_REGNUM) |
9dca5578 DJ |
4599 | { |
4600 | base = (base + 4) & ~(CORE_ADDR) 0x3; | |
4601 | if (bit (inst1, 7)) | |
4602 | base += bits (inst2, 0, 11); | |
4603 | else | |
4604 | base -= bits (inst2, 0, 11); | |
4605 | } | |
4606 | else if (bit (inst1, 7)) | |
4607 | base += bits (inst2, 0, 11); | |
4608 | else if (bit (inst2, 11)) | |
4609 | { | |
4610 | if (bit (inst2, 10)) | |
4611 | { | |
4612 | if (bit (inst2, 9)) | |
4613 | base += bits (inst2, 0, 7); | |
4614 | else | |
4615 | base -= bits (inst2, 0, 7); | |
4616 | } | |
4617 | } | |
4618 | else if ((inst2 & 0x0fc0) == 0x0000) | |
4619 | { | |
4620 | int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3); | |
4621 | base += get_frame_register_unsigned (frame, rm) << shift; | |
4622 | } | |
4623 | else | |
4624 | /* Reserved. */ | |
4625 | load_pc = 0; | |
4626 | ||
4627 | if (load_pc) | |
4628 | nextpc = get_frame_memory_unsigned (frame, base, 4); | |
4629 | } | |
4630 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
4631 | { | |
4632 | /* TBB. */ | |
d476da0e RE |
4633 | CORE_ADDR tbl_reg, table, offset, length; |
4634 | ||
4635 | tbl_reg = bits (inst1, 0, 3); | |
4636 | if (tbl_reg == 0x0f) | |
4637 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4638 | else | |
4639 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4640 | |
9dca5578 DJ |
4641 | offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4642 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 1); | |
4643 | nextpc = pc_val + length; | |
4644 | } | |
d476da0e | 4645 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) |
9dca5578 DJ |
4646 | { |
4647 | /* TBH. */ | |
d476da0e RE |
4648 | CORE_ADDR tbl_reg, table, offset, length; |
4649 | ||
4650 | tbl_reg = bits (inst1, 0, 3); | |
4651 | if (tbl_reg == 0x0f) | |
4652 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4653 | else | |
4654 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4655 | |
9dca5578 DJ |
4656 | offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4657 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 2); | |
4658 | nextpc = pc_val + length; | |
4659 | } | |
c906108c | 4660 | } |
aa17d93e | 4661 | else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */ |
9498281f DJ |
4662 | { |
4663 | if (bits (inst1, 3, 6) == 0x0f) | |
6ca1b147 | 4664 | nextpc = UNMAKE_THUMB_ADDR (pc_val); |
9498281f | 4665 | else |
0b1b3e42 | 4666 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); |
9498281f | 4667 | } |
ad8b5167 UW |
4668 | else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */ |
4669 | { | |
4670 | if (bits (inst1, 3, 6) == 0x0f) | |
4671 | nextpc = pc_val; | |
4672 | else | |
4673 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); | |
4674 | ||
4675 | nextpc = MAKE_THUMB_ADDR (nextpc); | |
4676 | } | |
9dca5578 DJ |
4677 | else if ((inst1 & 0xf500) == 0xb100) |
4678 | { | |
4679 | /* CBNZ or CBZ. */ | |
4680 | int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1); | |
4681 | ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2)); | |
4682 | ||
4683 | if (bit (inst1, 11) && reg != 0) | |
4684 | nextpc = pc_val + imm; | |
4685 | else if (!bit (inst1, 11) && reg == 0) | |
4686 | nextpc = pc_val + imm; | |
4687 | } | |
c906108c SS |
4688 | return nextpc; |
4689 | } | |
4690 | ||
50e98be4 | 4691 | /* Get the raw next address. PC is the current program counter, in |
18819fa6 | 4692 | FRAME, which is assumed to be executing in ARM mode. |
50e98be4 DJ |
4693 | |
4694 | The value returned has the execution state of the next instruction | |
4695 | encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is | |
4696 | in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory | |
0963b4bd MS |
4697 | address. */ |
4698 | ||
50e98be4 | 4699 | static CORE_ADDR |
18819fa6 | 4700 | arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4701 | { |
2af46ca0 | 4702 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
4703 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4704 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c906108c SS |
4705 | unsigned long pc_val; |
4706 | unsigned long this_instr; | |
4707 | unsigned long status; | |
4708 | CORE_ADDR nextpc; | |
4709 | ||
c906108c | 4710 | pc_val = (unsigned long) pc; |
e17a4113 | 4711 | this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
9d4fde75 | 4712 | |
0b1b3e42 | 4713 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
c5aa993b | 4714 | nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */ |
c906108c | 4715 | |
daddc3c1 DJ |
4716 | if (bits (this_instr, 28, 31) == INST_NV) |
4717 | switch (bits (this_instr, 24, 27)) | |
4718 | { | |
4719 | case 0xa: | |
4720 | case 0xb: | |
4721 | { | |
4722 | /* Branch with Link and change to Thumb. */ | |
4723 | nextpc = BranchDest (pc, this_instr); | |
4724 | nextpc |= bit (this_instr, 24) << 1; | |
50e98be4 | 4725 | nextpc = MAKE_THUMB_ADDR (nextpc); |
daddc3c1 DJ |
4726 | break; |
4727 | } | |
4728 | case 0xc: | |
4729 | case 0xd: | |
4730 | case 0xe: | |
4731 | /* Coprocessor register transfer. */ | |
4732 | if (bits (this_instr, 12, 15) == 15) | |
4733 | error (_("Invalid update to pc in instruction")); | |
4734 | break; | |
4735 | } | |
4736 | else if (condition_true (bits (this_instr, 28, 31), status)) | |
c906108c SS |
4737 | { |
4738 | switch (bits (this_instr, 24, 27)) | |
4739 | { | |
c5aa993b | 4740 | case 0x0: |
94c30b78 | 4741 | case 0x1: /* data processing */ |
c5aa993b JM |
4742 | case 0x2: |
4743 | case 0x3: | |
c906108c SS |
4744 | { |
4745 | unsigned long operand1, operand2, result = 0; | |
4746 | unsigned long rn; | |
4747 | int c; | |
c5aa993b | 4748 | |
c906108c SS |
4749 | if (bits (this_instr, 12, 15) != 15) |
4750 | break; | |
4751 | ||
4752 | if (bits (this_instr, 22, 25) == 0 | |
c5aa993b | 4753 | && bits (this_instr, 4, 7) == 9) /* multiply */ |
edefbb7c | 4754 | error (_("Invalid update to pc in instruction")); |
c906108c | 4755 | |
9498281f | 4756 | /* BX <reg>, BLX <reg> */ |
e150acc7 PB |
4757 | if (bits (this_instr, 4, 27) == 0x12fff1 |
4758 | || bits (this_instr, 4, 27) == 0x12fff3) | |
9498281f DJ |
4759 | { |
4760 | rn = bits (this_instr, 0, 3); | |
bf9f652a YQ |
4761 | nextpc = ((rn == ARM_PC_REGNUM) |
4762 | ? (pc_val + 8) | |
4763 | : get_frame_register_unsigned (frame, rn)); | |
4764 | ||
9498281f DJ |
4765 | return nextpc; |
4766 | } | |
4767 | ||
0963b4bd | 4768 | /* Multiply into PC. */ |
c906108c SS |
4769 | c = (status & FLAG_C) ? 1 : 0; |
4770 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4771 | operand1 = ((rn == ARM_PC_REGNUM) |
4772 | ? (pc_val + 8) | |
4773 | : get_frame_register_unsigned (frame, rn)); | |
c5aa993b | 4774 | |
c906108c SS |
4775 | if (bit (this_instr, 25)) |
4776 | { | |
4777 | unsigned long immval = bits (this_instr, 0, 7); | |
4778 | unsigned long rotate = 2 * bits (this_instr, 8, 11); | |
c5aa993b JM |
4779 | operand2 = ((immval >> rotate) | (immval << (32 - rotate))) |
4780 | & 0xffffffff; | |
c906108c | 4781 | } |
0963b4bd MS |
4782 | else /* operand 2 is a shifted register. */ |
4783 | operand2 = shifted_reg_val (frame, this_instr, c, | |
4784 | pc_val, status); | |
c5aa993b | 4785 | |
c906108c SS |
4786 | switch (bits (this_instr, 21, 24)) |
4787 | { | |
c5aa993b | 4788 | case 0x0: /*and */ |
c906108c SS |
4789 | result = operand1 & operand2; |
4790 | break; | |
4791 | ||
c5aa993b | 4792 | case 0x1: /*eor */ |
c906108c SS |
4793 | result = operand1 ^ operand2; |
4794 | break; | |
4795 | ||
c5aa993b | 4796 | case 0x2: /*sub */ |
c906108c SS |
4797 | result = operand1 - operand2; |
4798 | break; | |
4799 | ||
c5aa993b | 4800 | case 0x3: /*rsb */ |
c906108c SS |
4801 | result = operand2 - operand1; |
4802 | break; | |
4803 | ||
c5aa993b | 4804 | case 0x4: /*add */ |
c906108c SS |
4805 | result = operand1 + operand2; |
4806 | break; | |
4807 | ||
c5aa993b | 4808 | case 0x5: /*adc */ |
c906108c SS |
4809 | result = operand1 + operand2 + c; |
4810 | break; | |
4811 | ||
c5aa993b | 4812 | case 0x6: /*sbc */ |
c906108c SS |
4813 | result = operand1 - operand2 + c; |
4814 | break; | |
4815 | ||
c5aa993b | 4816 | case 0x7: /*rsc */ |
c906108c SS |
4817 | result = operand2 - operand1 + c; |
4818 | break; | |
4819 | ||
c5aa993b JM |
4820 | case 0x8: |
4821 | case 0x9: | |
4822 | case 0xa: | |
4823 | case 0xb: /* tst, teq, cmp, cmn */ | |
c906108c SS |
4824 | result = (unsigned long) nextpc; |
4825 | break; | |
4826 | ||
c5aa993b | 4827 | case 0xc: /*orr */ |
c906108c SS |
4828 | result = operand1 | operand2; |
4829 | break; | |
4830 | ||
c5aa993b | 4831 | case 0xd: /*mov */ |
c906108c SS |
4832 | /* Always step into a function. */ |
4833 | result = operand2; | |
c5aa993b | 4834 | break; |
c906108c | 4835 | |
c5aa993b | 4836 | case 0xe: /*bic */ |
c906108c SS |
4837 | result = operand1 & ~operand2; |
4838 | break; | |
4839 | ||
c5aa993b | 4840 | case 0xf: /*mvn */ |
c906108c SS |
4841 | result = ~operand2; |
4842 | break; | |
4843 | } | |
c906108c | 4844 | |
50e98be4 DJ |
4845 | /* In 26-bit APCS the bottom two bits of the result are |
4846 | ignored, and we always end up in ARM state. */ | |
4847 | if (!arm_apcs_32) | |
4848 | nextpc = arm_addr_bits_remove (gdbarch, result); | |
4849 | else | |
4850 | nextpc = result; | |
4851 | ||
c906108c SS |
4852 | break; |
4853 | } | |
c5aa993b JM |
4854 | |
4855 | case 0x4: | |
4856 | case 0x5: /* data transfer */ | |
4857 | case 0x6: | |
4858 | case 0x7: | |
c906108c SS |
4859 | if (bit (this_instr, 20)) |
4860 | { | |
4861 | /* load */ | |
4862 | if (bits (this_instr, 12, 15) == 15) | |
4863 | { | |
4864 | /* rd == pc */ | |
c5aa993b | 4865 | unsigned long rn; |
c906108c | 4866 | unsigned long base; |
c5aa993b | 4867 | |
c906108c | 4868 | if (bit (this_instr, 22)) |
edefbb7c | 4869 | error (_("Invalid update to pc in instruction")); |
c906108c SS |
4870 | |
4871 | /* byte write to PC */ | |
4872 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4873 | base = ((rn == ARM_PC_REGNUM) |
4874 | ? (pc_val + 8) | |
4875 | : get_frame_register_unsigned (frame, rn)); | |
4876 | ||
c906108c SS |
4877 | if (bit (this_instr, 24)) |
4878 | { | |
4879 | /* pre-indexed */ | |
4880 | int c = (status & FLAG_C) ? 1 : 0; | |
4881 | unsigned long offset = | |
c5aa993b | 4882 | (bit (this_instr, 25) |
0b1b3e42 | 4883 | ? shifted_reg_val (frame, this_instr, c, pc_val, status) |
c5aa993b | 4884 | : bits (this_instr, 0, 11)); |
c906108c SS |
4885 | |
4886 | if (bit (this_instr, 23)) | |
4887 | base += offset; | |
4888 | else | |
4889 | base -= offset; | |
4890 | } | |
51370a33 YQ |
4891 | nextpc = |
4892 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) base, | |
4893 | 4, byte_order); | |
c906108c SS |
4894 | } |
4895 | } | |
4896 | break; | |
c5aa993b JM |
4897 | |
4898 | case 0x8: | |
4899 | case 0x9: /* block transfer */ | |
c906108c SS |
4900 | if (bit (this_instr, 20)) |
4901 | { | |
4902 | /* LDM */ | |
4903 | if (bit (this_instr, 15)) | |
4904 | { | |
4905 | /* loading pc */ | |
4906 | int offset = 0; | |
51370a33 YQ |
4907 | unsigned long rn_val |
4908 | = get_frame_register_unsigned (frame, | |
4909 | bits (this_instr, 16, 19)); | |
c906108c SS |
4910 | |
4911 | if (bit (this_instr, 23)) | |
4912 | { | |
4913 | /* up */ | |
4914 | unsigned long reglist = bits (this_instr, 0, 14); | |
4915 | offset = bitcount (reglist) * 4; | |
c5aa993b | 4916 | if (bit (this_instr, 24)) /* pre */ |
c906108c SS |
4917 | offset += 4; |
4918 | } | |
4919 | else if (bit (this_instr, 24)) | |
4920 | offset = -4; | |
c5aa993b | 4921 | |
51370a33 YQ |
4922 | nextpc = |
4923 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) | |
4924 | (rn_val + offset), | |
4925 | 4, byte_order); | |
c906108c SS |
4926 | } |
4927 | } | |
4928 | break; | |
c5aa993b JM |
4929 | |
4930 | case 0xb: /* branch & link */ | |
4931 | case 0xa: /* branch */ | |
c906108c SS |
4932 | { |
4933 | nextpc = BranchDest (pc, this_instr); | |
c906108c SS |
4934 | break; |
4935 | } | |
c5aa993b JM |
4936 | |
4937 | case 0xc: | |
4938 | case 0xd: | |
4939 | case 0xe: /* coproc ops */ | |
25b41d01 | 4940 | break; |
c5aa993b | 4941 | case 0xf: /* SWI */ |
25b41d01 YQ |
4942 | { |
4943 | struct gdbarch_tdep *tdep; | |
4944 | tdep = gdbarch_tdep (gdbarch); | |
4945 | ||
4946 | if (tdep->syscall_next_pc != NULL) | |
4947 | nextpc = tdep->syscall_next_pc (frame); | |
4948 | ||
4949 | } | |
c906108c SS |
4950 | break; |
4951 | ||
4952 | default: | |
edefbb7c | 4953 | fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n")); |
c906108c SS |
4954 | return (pc); |
4955 | } | |
4956 | } | |
4957 | ||
4958 | return nextpc; | |
4959 | } | |
4960 | ||
18819fa6 UW |
4961 | /* Determine next PC after current instruction executes. Will call either |
4962 | arm_get_next_pc_raw or thumb_get_next_pc_raw. Error out if infinite | |
4963 | loop is detected. */ | |
4964 | ||
50e98be4 DJ |
4965 | CORE_ADDR |
4966 | arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc) | |
4967 | { | |
18819fa6 UW |
4968 | CORE_ADDR nextpc; |
4969 | ||
4970 | if (arm_frame_is_thumb (frame)) | |
4971 | { | |
4972 | nextpc = thumb_get_next_pc_raw (frame, pc); | |
4973 | if (nextpc == MAKE_THUMB_ADDR (pc)) | |
4974 | error (_("Infinite loop detected")); | |
4975 | } | |
4976 | else | |
4977 | { | |
4978 | nextpc = arm_get_next_pc_raw (frame, pc); | |
4979 | if (nextpc == pc) | |
4980 | error (_("Infinite loop detected")); | |
4981 | } | |
4982 | ||
50e98be4 DJ |
4983 | return nextpc; |
4984 | } | |
4985 | ||
18819fa6 UW |
4986 | /* Like insert_single_step_breakpoint, but make sure we use a breakpoint |
4987 | of the appropriate mode (as encoded in the PC value), even if this | |
4988 | differs from what would be expected according to the symbol tables. */ | |
4989 | ||
4990 | void | |
4991 | arm_insert_single_step_breakpoint (struct gdbarch *gdbarch, | |
4992 | struct address_space *aspace, | |
4993 | CORE_ADDR pc) | |
4994 | { | |
4995 | struct cleanup *old_chain | |
4996 | = make_cleanup_restore_integer (&arm_override_mode); | |
4997 | ||
4998 | arm_override_mode = IS_THUMB_ADDR (pc); | |
4999 | pc = gdbarch_addr_bits_remove (gdbarch, pc); | |
5000 | ||
5001 | insert_single_step_breakpoint (gdbarch, aspace, pc); | |
5002 | ||
5003 | do_cleanups (old_chain); | |
5004 | } | |
5005 | ||
35f73cfc UW |
5006 | /* Checks for an atomic sequence of instructions beginning with a LDREX{,B,H,D} |
5007 | instruction and ending with a STREX{,B,H,D} instruction. If such a sequence | |
5008 | is found, attempt to step through it. A breakpoint is placed at the end of | |
5009 | the sequence. */ | |
5010 | ||
5011 | static int | |
5012 | thumb_deal_with_atomic_sequence_raw (struct frame_info *frame) | |
5013 | { | |
5014 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
5015 | struct address_space *aspace = get_frame_address_space (frame); | |
5016 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
5017 | CORE_ADDR pc = get_frame_pc (frame); | |
5018 | CORE_ADDR breaks[2] = {-1, -1}; | |
5019 | CORE_ADDR loc = pc; | |
5020 | unsigned short insn1, insn2; | |
5021 | int insn_count; | |
5022 | int index; | |
5023 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ | |
5024 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ | |
5025 | ULONGEST status, itstate; | |
5026 | ||
5027 | /* We currently do not support atomic sequences within an IT block. */ | |
5028 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
5029 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); | |
5030 | if (itstate & 0x0f) | |
5031 | return 0; | |
5032 | ||
5033 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. */ | |
5034 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5035 | loc += 2; | |
5036 | if (thumb_insn_size (insn1) != 4) | |
5037 | return 0; | |
5038 | ||
5039 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5040 | loc += 2; | |
5041 | if (!((insn1 & 0xfff0) == 0xe850 | |
5042 | || ((insn1 & 0xfff0) == 0xe8d0 && (insn2 & 0x00c0) == 0x0040))) | |
5043 | return 0; | |
5044 | ||
5045 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" | |
5046 | instructions. */ | |
5047 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) | |
5048 | { | |
5049 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5050 | loc += 2; | |
5051 | ||
5052 | if (thumb_insn_size (insn1) != 4) | |
5053 | { | |
5054 | /* Assume that there is at most one conditional branch in the | |
5055 | atomic sequence. If a conditional branch is found, put a | |
5056 | breakpoint in its destination address. */ | |
5057 | if ((insn1 & 0xf000) == 0xd000 && bits (insn1, 8, 11) != 0x0f) | |
5058 | { | |
5059 | if (last_breakpoint > 0) | |
5060 | return 0; /* More than one conditional branch found, | |
5061 | fallback to the standard code. */ | |
5062 | ||
5063 | breaks[1] = loc + 2 + (sbits (insn1, 0, 7) << 1); | |
5064 | last_breakpoint++; | |
5065 | } | |
5066 | ||
5067 | /* We do not support atomic sequences that use any *other* | |
5068 | instructions but conditional branches to change the PC. | |
5069 | Fall back to standard code to avoid losing control of | |
5070 | execution. */ | |
5071 | else if (thumb_instruction_changes_pc (insn1)) | |
5072 | return 0; | |
5073 | } | |
5074 | else | |
5075 | { | |
5076 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); | |
5077 | loc += 2; | |
5078 | ||
5079 | /* Assume that there is at most one conditional branch in the | |
5080 | atomic sequence. If a conditional branch is found, put a | |
5081 | breakpoint in its destination address. */ | |
5082 | if ((insn1 & 0xf800) == 0xf000 | |
5083 | && (insn2 & 0xd000) == 0x8000 | |
5084 | && (insn1 & 0x0380) != 0x0380) | |
5085 | { | |
5086 | int sign, j1, j2, imm1, imm2; | |
5087 | unsigned int offset; | |
5088 | ||
5089 | sign = sbits (insn1, 10, 10); | |
5090 | imm1 = bits (insn1, 0, 5); | |
5091 | imm2 = bits (insn2, 0, 10); | |
5092 | j1 = bit (insn2, 13); | |
5093 | j2 = bit (insn2, 11); | |
5094 | ||
5095 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
5096 | offset += (imm1 << 12) + (imm2 << 1); | |
5097 | ||
5098 | if (last_breakpoint > 0) | |
5099 | return 0; /* More than one conditional branch found, | |
5100 | fallback to the standard code. */ | |
5101 | ||
5102 | breaks[1] = loc + offset; | |
5103 | last_breakpoint++; | |
5104 | } | |
5105 | ||
5106 | /* We do not support atomic sequences that use any *other* | |
5107 | instructions but conditional branches to change the PC. | |
5108 | Fall back to standard code to avoid losing control of | |
5109 | execution. */ | |
5110 | else if (thumb2_instruction_changes_pc (insn1, insn2)) | |
5111 | return 0; | |
5112 | ||
5113 | /* If we find a strex{,b,h,d}, we're done. */ | |
5114 | if ((insn1 & 0xfff0) == 0xe840 | |
5115 | || ((insn1 & 0xfff0) == 0xe8c0 && (insn2 & 0x00c0) == 0x0040)) | |
5116 | break; | |
5117 | } | |
5118 | } | |
5119 | ||
5120 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ | |
5121 | if (insn_count == atomic_sequence_length) | |
5122 | return 0; | |
5123 | ||
5124 | /* Insert a breakpoint right after the end of the atomic sequence. */ | |
5125 | breaks[0] = loc; | |
5126 | ||
5127 | /* Check for duplicated breakpoints. Check also for a breakpoint | |
5128 | placed (branch instruction's destination) anywhere in sequence. */ | |
5129 | if (last_breakpoint | |
5130 | && (breaks[1] == breaks[0] | |
5131 | || (breaks[1] >= pc && breaks[1] < loc))) | |
5132 | last_breakpoint = 0; | |
5133 | ||
5134 | /* Effectively inserts the breakpoints. */ | |
5135 | for (index = 0; index <= last_breakpoint; index++) | |
5136 | arm_insert_single_step_breakpoint (gdbarch, aspace, | |
5137 | MAKE_THUMB_ADDR (breaks[index])); | |
5138 | ||
5139 | return 1; | |
5140 | } | |
5141 | ||
5142 | static int | |
5143 | arm_deal_with_atomic_sequence_raw (struct frame_info *frame) | |
5144 | { | |
5145 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
5146 | struct address_space *aspace = get_frame_address_space (frame); | |
5147 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
5148 | CORE_ADDR pc = get_frame_pc (frame); | |
5149 | CORE_ADDR breaks[2] = {-1, -1}; | |
5150 | CORE_ADDR loc = pc; | |
5151 | unsigned int insn; | |
5152 | int insn_count; | |
5153 | int index; | |
5154 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ | |
5155 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ | |
5156 | ||
5157 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. | |
5158 | Note that we do not currently support conditionally executed atomic | |
5159 | instructions. */ | |
5160 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); | |
5161 | loc += 4; | |
5162 | if ((insn & 0xff9000f0) != 0xe1900090) | |
5163 | return 0; | |
5164 | ||
5165 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" | |
5166 | instructions. */ | |
5167 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) | |
5168 | { | |
5169 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); | |
5170 | loc += 4; | |
5171 | ||
5172 | /* Assume that there is at most one conditional branch in the atomic | |
5173 | sequence. If a conditional branch is found, put a breakpoint in | |
5174 | its destination address. */ | |
5175 | if (bits (insn, 24, 27) == 0xa) | |
5176 | { | |
5177 | if (last_breakpoint > 0) | |
5178 | return 0; /* More than one conditional branch found, fallback | |
5179 | to the standard single-step code. */ | |
5180 | ||
5181 | breaks[1] = BranchDest (loc - 4, insn); | |
5182 | last_breakpoint++; | |
5183 | } | |
5184 | ||
5185 | /* We do not support atomic sequences that use any *other* instructions | |
5186 | but conditional branches to change the PC. Fall back to standard | |
5187 | code to avoid losing control of execution. */ | |
5188 | else if (arm_instruction_changes_pc (insn)) | |
5189 | return 0; | |
5190 | ||
5191 | /* If we find a strex{,b,h,d}, we're done. */ | |
5192 | if ((insn & 0xff9000f0) == 0xe1800090) | |
5193 | break; | |
5194 | } | |
5195 | ||
5196 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ | |
5197 | if (insn_count == atomic_sequence_length) | |
5198 | return 0; | |
5199 | ||
5200 | /* Insert a breakpoint right after the end of the atomic sequence. */ | |
5201 | breaks[0] = loc; | |
5202 | ||
5203 | /* Check for duplicated breakpoints. Check also for a breakpoint | |
5204 | placed (branch instruction's destination) anywhere in sequence. */ | |
5205 | if (last_breakpoint | |
5206 | && (breaks[1] == breaks[0] | |
5207 | || (breaks[1] >= pc && breaks[1] < loc))) | |
5208 | last_breakpoint = 0; | |
5209 | ||
5210 | /* Effectively inserts the breakpoints. */ | |
5211 | for (index = 0; index <= last_breakpoint; index++) | |
5212 | arm_insert_single_step_breakpoint (gdbarch, aspace, breaks[index]); | |
5213 | ||
5214 | return 1; | |
5215 | } | |
5216 | ||
5217 | int | |
5218 | arm_deal_with_atomic_sequence (struct frame_info *frame) | |
5219 | { | |
5220 | if (arm_frame_is_thumb (frame)) | |
5221 | return thumb_deal_with_atomic_sequence_raw (frame); | |
5222 | else | |
5223 | return arm_deal_with_atomic_sequence_raw (frame); | |
5224 | } | |
5225 | ||
9512d7fd FN |
5226 | /* single_step() is called just before we want to resume the inferior, |
5227 | if we want to single-step it but there is no hardware or kernel | |
5228 | single-step support. We find the target of the coming instruction | |
e0cd558a | 5229 | and breakpoint it. */ |
9512d7fd | 5230 | |
190dce09 | 5231 | int |
0b1b3e42 | 5232 | arm_software_single_step (struct frame_info *frame) |
9512d7fd | 5233 | { |
a6d9a66e | 5234 | struct gdbarch *gdbarch = get_frame_arch (frame); |
6c95b8df | 5235 | struct address_space *aspace = get_frame_address_space (frame); |
35f73cfc UW |
5236 | CORE_ADDR next_pc; |
5237 | ||
5238 | if (arm_deal_with_atomic_sequence (frame)) | |
5239 | return 1; | |
18819fa6 | 5240 | |
35f73cfc | 5241 | next_pc = arm_get_next_pc (frame, get_frame_pc (frame)); |
18819fa6 | 5242 | arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc); |
e6590a1b UW |
5243 | |
5244 | return 1; | |
9512d7fd | 5245 | } |
9512d7fd | 5246 | |
f9d67f43 DJ |
5247 | /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand |
5248 | the buffer to be NEW_LEN bytes ending at ENDADDR. Return | |
5249 | NULL if an error occurs. BUF is freed. */ | |
5250 | ||
5251 | static gdb_byte * | |
5252 | extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr, | |
5253 | int old_len, int new_len) | |
5254 | { | |
22e048c9 | 5255 | gdb_byte *new_buf; |
f9d67f43 DJ |
5256 | int bytes_to_read = new_len - old_len; |
5257 | ||
5258 | new_buf = xmalloc (new_len); | |
5259 | memcpy (new_buf + bytes_to_read, buf, old_len); | |
5260 | xfree (buf); | |
5261 | if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0) | |
5262 | { | |
5263 | xfree (new_buf); | |
5264 | return NULL; | |
5265 | } | |
5266 | return new_buf; | |
5267 | } | |
5268 | ||
5269 | /* An IT block is at most the 2-byte IT instruction followed by | |
5270 | four 4-byte instructions. The furthest back we must search to | |
5271 | find an IT block that affects the current instruction is thus | |
5272 | 2 + 3 * 4 == 14 bytes. */ | |
5273 | #define MAX_IT_BLOCK_PREFIX 14 | |
5274 | ||
5275 | /* Use a quick scan if there are more than this many bytes of | |
5276 | code. */ | |
5277 | #define IT_SCAN_THRESHOLD 32 | |
5278 | ||
5279 | /* Adjust a breakpoint's address to move breakpoints out of IT blocks. | |
5280 | A breakpoint in an IT block may not be hit, depending on the | |
5281 | condition flags. */ | |
5282 | static CORE_ADDR | |
5283 | arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr) | |
5284 | { | |
5285 | gdb_byte *buf; | |
5286 | char map_type; | |
5287 | CORE_ADDR boundary, func_start; | |
22e048c9 | 5288 | int buf_len; |
f9d67f43 DJ |
5289 | enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch); |
5290 | int i, any, last_it, last_it_count; | |
5291 | ||
5292 | /* If we are using BKPT breakpoints, none of this is necessary. */ | |
5293 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL) | |
5294 | return bpaddr; | |
5295 | ||
5296 | /* ARM mode does not have this problem. */ | |
9779414d | 5297 | if (!arm_pc_is_thumb (gdbarch, bpaddr)) |
f9d67f43 DJ |
5298 | return bpaddr; |
5299 | ||
5300 | /* We are setting a breakpoint in Thumb code that could potentially | |
5301 | contain an IT block. The first step is to find how much Thumb | |
5302 | code there is; we do not need to read outside of known Thumb | |
5303 | sequences. */ | |
5304 | map_type = arm_find_mapping_symbol (bpaddr, &boundary); | |
5305 | if (map_type == 0) | |
5306 | /* Thumb-2 code must have mapping symbols to have a chance. */ | |
5307 | return bpaddr; | |
5308 | ||
5309 | bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr); | |
5310 | ||
5311 | if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL) | |
5312 | && func_start > boundary) | |
5313 | boundary = func_start; | |
5314 | ||
5315 | /* Search for a candidate IT instruction. We have to do some fancy | |
5316 | footwork to distinguish a real IT instruction from the second | |
5317 | half of a 32-bit instruction, but there is no need for that if | |
5318 | there's no candidate. */ | |
5319 | buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX); | |
5320 | if (buf_len == 0) | |
5321 | /* No room for an IT instruction. */ | |
5322 | return bpaddr; | |
5323 | ||
5324 | buf = xmalloc (buf_len); | |
5325 | if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0) | |
5326 | return bpaddr; | |
5327 | any = 0; | |
5328 | for (i = 0; i < buf_len; i += 2) | |
5329 | { | |
5330 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5331 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5332 | { | |
5333 | any = 1; | |
5334 | break; | |
5335 | } | |
5336 | } | |
5337 | if (any == 0) | |
5338 | { | |
5339 | xfree (buf); | |
5340 | return bpaddr; | |
5341 | } | |
5342 | ||
5343 | /* OK, the code bytes before this instruction contain at least one | |
5344 | halfword which resembles an IT instruction. We know that it's | |
5345 | Thumb code, but there are still two possibilities. Either the | |
5346 | halfword really is an IT instruction, or it is the second half of | |
5347 | a 32-bit Thumb instruction. The only way we can tell is to | |
5348 | scan forwards from a known instruction boundary. */ | |
5349 | if (bpaddr - boundary > IT_SCAN_THRESHOLD) | |
5350 | { | |
5351 | int definite; | |
5352 | ||
5353 | /* There's a lot of code before this instruction. Start with an | |
5354 | optimistic search; it's easy to recognize halfwords that can | |
5355 | not be the start of a 32-bit instruction, and use that to | |
5356 | lock on to the instruction boundaries. */ | |
5357 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD); | |
5358 | if (buf == NULL) | |
5359 | return bpaddr; | |
5360 | buf_len = IT_SCAN_THRESHOLD; | |
5361 | ||
5362 | definite = 0; | |
5363 | for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2) | |
5364 | { | |
5365 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5366 | if (thumb_insn_size (inst1) == 2) | |
5367 | { | |
5368 | definite = 1; | |
5369 | break; | |
5370 | } | |
5371 | } | |
5372 | ||
5373 | /* At this point, if DEFINITE, BUF[I] is the first place we | |
5374 | are sure that we know the instruction boundaries, and it is far | |
5375 | enough from BPADDR that we could not miss an IT instruction | |
5376 | affecting BPADDR. If ! DEFINITE, give up - start from a | |
5377 | known boundary. */ | |
5378 | if (! definite) | |
5379 | { | |
0963b4bd MS |
5380 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, |
5381 | bpaddr - boundary); | |
f9d67f43 DJ |
5382 | if (buf == NULL) |
5383 | return bpaddr; | |
5384 | buf_len = bpaddr - boundary; | |
5385 | i = 0; | |
5386 | } | |
5387 | } | |
5388 | else | |
5389 | { | |
5390 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary); | |
5391 | if (buf == NULL) | |
5392 | return bpaddr; | |
5393 | buf_len = bpaddr - boundary; | |
5394 | i = 0; | |
5395 | } | |
5396 | ||
5397 | /* Scan forwards. Find the last IT instruction before BPADDR. */ | |
5398 | last_it = -1; | |
5399 | last_it_count = 0; | |
5400 | while (i < buf_len) | |
5401 | { | |
5402 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5403 | last_it_count--; | |
5404 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5405 | { | |
5406 | last_it = i; | |
5407 | if (inst1 & 0x0001) | |
5408 | last_it_count = 4; | |
5409 | else if (inst1 & 0x0002) | |
5410 | last_it_count = 3; | |
5411 | else if (inst1 & 0x0004) | |
5412 | last_it_count = 2; | |
5413 | else | |
5414 | last_it_count = 1; | |
5415 | } | |
5416 | i += thumb_insn_size (inst1); | |
5417 | } | |
5418 | ||
5419 | xfree (buf); | |
5420 | ||
5421 | if (last_it == -1) | |
5422 | /* There wasn't really an IT instruction after all. */ | |
5423 | return bpaddr; | |
5424 | ||
5425 | if (last_it_count < 1) | |
5426 | /* It was too far away. */ | |
5427 | return bpaddr; | |
5428 | ||
5429 | /* This really is a trouble spot. Move the breakpoint to the IT | |
5430 | instruction. */ | |
5431 | return bpaddr - buf_len + last_it; | |
5432 | } | |
5433 | ||
cca44b1b | 5434 | /* ARM displaced stepping support. |
c906108c | 5435 | |
cca44b1b | 5436 | Generally ARM displaced stepping works as follows: |
c906108c | 5437 | |
cca44b1b JB |
5438 | 1. When an instruction is to be single-stepped, it is first decoded by |
5439 | arm_process_displaced_insn (called from arm_displaced_step_copy_insn). | |
5440 | Depending on the type of instruction, it is then copied to a scratch | |
5441 | location, possibly in a modified form. The copy_* set of functions | |
0963b4bd | 5442 | performs such modification, as necessary. A breakpoint is placed after |
cca44b1b JB |
5443 | the modified instruction in the scratch space to return control to GDB. |
5444 | Note in particular that instructions which modify the PC will no longer | |
5445 | do so after modification. | |
c5aa993b | 5446 | |
cca44b1b JB |
5447 | 2. The instruction is single-stepped, by setting the PC to the scratch |
5448 | location address, and resuming. Control returns to GDB when the | |
5449 | breakpoint is hit. | |
c5aa993b | 5450 | |
cca44b1b JB |
5451 | 3. A cleanup function (cleanup_*) is called corresponding to the copy_* |
5452 | function used for the current instruction. This function's job is to | |
5453 | put the CPU/memory state back to what it would have been if the | |
5454 | instruction had been executed unmodified in its original location. */ | |
c5aa993b | 5455 | |
cca44b1b JB |
5456 | /* NOP instruction (mov r0, r0). */ |
5457 | #define ARM_NOP 0xe1a00000 | |
34518530 | 5458 | #define THUMB_NOP 0x4600 |
cca44b1b JB |
5459 | |
5460 | /* Helper for register reads for displaced stepping. In particular, this | |
5461 | returns the PC as it would be seen by the instruction at its original | |
5462 | location. */ | |
5463 | ||
5464 | ULONGEST | |
36073a92 YQ |
5465 | displaced_read_reg (struct regcache *regs, struct displaced_step_closure *dsc, |
5466 | int regno) | |
cca44b1b JB |
5467 | { |
5468 | ULONGEST ret; | |
36073a92 | 5469 | CORE_ADDR from = dsc->insn_addr; |
cca44b1b | 5470 | |
bf9f652a | 5471 | if (regno == ARM_PC_REGNUM) |
cca44b1b | 5472 | { |
4db71c0b YQ |
5473 | /* Compute pipeline offset: |
5474 | - When executing an ARM instruction, PC reads as the address of the | |
5475 | current instruction plus 8. | |
5476 | - When executing a Thumb instruction, PC reads as the address of the | |
5477 | current instruction plus 4. */ | |
5478 | ||
36073a92 | 5479 | if (!dsc->is_thumb) |
4db71c0b YQ |
5480 | from += 8; |
5481 | else | |
5482 | from += 4; | |
5483 | ||
cca44b1b JB |
5484 | if (debug_displaced) |
5485 | fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n", | |
4db71c0b YQ |
5486 | (unsigned long) from); |
5487 | return (ULONGEST) from; | |
cca44b1b | 5488 | } |
c906108c | 5489 | else |
cca44b1b JB |
5490 | { |
5491 | regcache_cooked_read_unsigned (regs, regno, &ret); | |
5492 | if (debug_displaced) | |
5493 | fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n", | |
5494 | regno, (unsigned long) ret); | |
5495 | return ret; | |
5496 | } | |
c906108c SS |
5497 | } |
5498 | ||
cca44b1b JB |
5499 | static int |
5500 | displaced_in_arm_mode (struct regcache *regs) | |
5501 | { | |
5502 | ULONGEST ps; | |
9779414d | 5503 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
66e810cd | 5504 | |
cca44b1b | 5505 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
66e810cd | 5506 | |
9779414d | 5507 | return (ps & t_bit) == 0; |
cca44b1b | 5508 | } |
66e810cd | 5509 | |
cca44b1b | 5510 | /* Write to the PC as from a branch instruction. */ |
c906108c | 5511 | |
cca44b1b | 5512 | static void |
36073a92 YQ |
5513 | branch_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5514 | ULONGEST val) | |
c906108c | 5515 | { |
36073a92 | 5516 | if (!dsc->is_thumb) |
cca44b1b JB |
5517 | /* Note: If bits 0/1 are set, this branch would be unpredictable for |
5518 | architecture versions < 6. */ | |
0963b4bd MS |
5519 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5520 | val & ~(ULONGEST) 0x3); | |
cca44b1b | 5521 | else |
0963b4bd MS |
5522 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5523 | val & ~(ULONGEST) 0x1); | |
cca44b1b | 5524 | } |
66e810cd | 5525 | |
cca44b1b JB |
5526 | /* Write to the PC as from a branch-exchange instruction. */ |
5527 | ||
5528 | static void | |
5529 | bx_write_pc (struct regcache *regs, ULONGEST val) | |
5530 | { | |
5531 | ULONGEST ps; | |
9779414d | 5532 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
cca44b1b JB |
5533 | |
5534 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); | |
5535 | ||
5536 | if ((val & 1) == 1) | |
c906108c | 5537 | { |
9779414d | 5538 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit); |
cca44b1b JB |
5539 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe); |
5540 | } | |
5541 | else if ((val & 2) == 0) | |
5542 | { | |
9779414d | 5543 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5544 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val); |
c906108c SS |
5545 | } |
5546 | else | |
5547 | { | |
cca44b1b JB |
5548 | /* Unpredictable behaviour. Try to do something sensible (switch to ARM |
5549 | mode, align dest to 4 bytes). */ | |
5550 | warning (_("Single-stepping BX to non-word-aligned ARM instruction.")); | |
9779414d | 5551 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5552 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc); |
c906108c SS |
5553 | } |
5554 | } | |
ed9a39eb | 5555 | |
cca44b1b | 5556 | /* Write to the PC as if from a load instruction. */ |
ed9a39eb | 5557 | |
34e8f22d | 5558 | static void |
36073a92 YQ |
5559 | load_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5560 | ULONGEST val) | |
ed9a39eb | 5561 | { |
cca44b1b JB |
5562 | if (DISPLACED_STEPPING_ARCH_VERSION >= 5) |
5563 | bx_write_pc (regs, val); | |
5564 | else | |
36073a92 | 5565 | branch_write_pc (regs, dsc, val); |
cca44b1b | 5566 | } |
be8626e0 | 5567 | |
cca44b1b JB |
5568 | /* Write to the PC as if from an ALU instruction. */ |
5569 | ||
5570 | static void | |
36073a92 YQ |
5571 | alu_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5572 | ULONGEST val) | |
cca44b1b | 5573 | { |
36073a92 | 5574 | if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb) |
cca44b1b JB |
5575 | bx_write_pc (regs, val); |
5576 | else | |
36073a92 | 5577 | branch_write_pc (regs, dsc, val); |
cca44b1b JB |
5578 | } |
5579 | ||
5580 | /* Helper for writing to registers for displaced stepping. Writing to the PC | |
5581 | has a varying effects depending on the instruction which does the write: | |
5582 | this is controlled by the WRITE_PC argument. */ | |
5583 | ||
5584 | void | |
5585 | displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc, | |
5586 | int regno, ULONGEST val, enum pc_write_style write_pc) | |
5587 | { | |
bf9f652a | 5588 | if (regno == ARM_PC_REGNUM) |
08216dd7 | 5589 | { |
cca44b1b JB |
5590 | if (debug_displaced) |
5591 | fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n", | |
5592 | (unsigned long) val); | |
5593 | switch (write_pc) | |
08216dd7 | 5594 | { |
cca44b1b | 5595 | case BRANCH_WRITE_PC: |
36073a92 | 5596 | branch_write_pc (regs, dsc, val); |
08216dd7 RE |
5597 | break; |
5598 | ||
cca44b1b JB |
5599 | case BX_WRITE_PC: |
5600 | bx_write_pc (regs, val); | |
5601 | break; | |
5602 | ||
5603 | case LOAD_WRITE_PC: | |
36073a92 | 5604 | load_write_pc (regs, dsc, val); |
cca44b1b JB |
5605 | break; |
5606 | ||
5607 | case ALU_WRITE_PC: | |
36073a92 | 5608 | alu_write_pc (regs, dsc, val); |
cca44b1b JB |
5609 | break; |
5610 | ||
5611 | case CANNOT_WRITE_PC: | |
5612 | warning (_("Instruction wrote to PC in an unexpected way when " | |
5613 | "single-stepping")); | |
08216dd7 RE |
5614 | break; |
5615 | ||
5616 | default: | |
97b9747c JB |
5617 | internal_error (__FILE__, __LINE__, |
5618 | _("Invalid argument to displaced_write_reg")); | |
08216dd7 | 5619 | } |
b508a996 | 5620 | |
cca44b1b | 5621 | dsc->wrote_to_pc = 1; |
b508a996 | 5622 | } |
ed9a39eb | 5623 | else |
b508a996 | 5624 | { |
cca44b1b JB |
5625 | if (debug_displaced) |
5626 | fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n", | |
5627 | regno, (unsigned long) val); | |
5628 | regcache_cooked_write_unsigned (regs, regno, val); | |
b508a996 | 5629 | } |
34e8f22d RE |
5630 | } |
5631 | ||
cca44b1b JB |
5632 | /* This function is used to concisely determine if an instruction INSN |
5633 | references PC. Register fields of interest in INSN should have the | |
0963b4bd MS |
5634 | corresponding fields of BITMASK set to 0b1111. The function |
5635 | returns return 1 if any of these fields in INSN reference the PC | |
5636 | (also 0b1111, r15), else it returns 0. */ | |
67255d04 RE |
5637 | |
5638 | static int | |
cca44b1b | 5639 | insn_references_pc (uint32_t insn, uint32_t bitmask) |
67255d04 | 5640 | { |
cca44b1b | 5641 | uint32_t lowbit = 1; |
67255d04 | 5642 | |
cca44b1b JB |
5643 | while (bitmask != 0) |
5644 | { | |
5645 | uint32_t mask; | |
44e1a9eb | 5646 | |
cca44b1b JB |
5647 | for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1) |
5648 | ; | |
67255d04 | 5649 | |
cca44b1b JB |
5650 | if (!lowbit) |
5651 | break; | |
67255d04 | 5652 | |
cca44b1b | 5653 | mask = lowbit * 0xf; |
67255d04 | 5654 | |
cca44b1b JB |
5655 | if ((insn & mask) == mask) |
5656 | return 1; | |
5657 | ||
5658 | bitmask &= ~mask; | |
67255d04 RE |
5659 | } |
5660 | ||
cca44b1b JB |
5661 | return 0; |
5662 | } | |
2af48f68 | 5663 | |
cca44b1b JB |
5664 | /* The simplest copy function. Many instructions have the same effect no |
5665 | matter what address they are executed at: in those cases, use this. */ | |
67255d04 | 5666 | |
cca44b1b | 5667 | static int |
7ff120b4 YQ |
5668 | arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, |
5669 | const char *iname, struct displaced_step_closure *dsc) | |
cca44b1b JB |
5670 | { |
5671 | if (debug_displaced) | |
5672 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, " | |
5673 | "opcode/class '%s' unmodified\n", (unsigned long) insn, | |
5674 | iname); | |
67255d04 | 5675 | |
cca44b1b | 5676 | dsc->modinsn[0] = insn; |
67255d04 | 5677 | |
cca44b1b JB |
5678 | return 0; |
5679 | } | |
5680 | ||
34518530 YQ |
5681 | static int |
5682 | thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
5683 | uint16_t insn2, const char *iname, | |
5684 | struct displaced_step_closure *dsc) | |
5685 | { | |
5686 | if (debug_displaced) | |
5687 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x %.4x, " | |
5688 | "opcode/class '%s' unmodified\n", insn1, insn2, | |
5689 | iname); | |
5690 | ||
5691 | dsc->modinsn[0] = insn1; | |
5692 | dsc->modinsn[1] = insn2; | |
5693 | dsc->numinsns = 2; | |
5694 | ||
5695 | return 0; | |
5696 | } | |
5697 | ||
5698 | /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any | |
5699 | modification. */ | |
5700 | static int | |
5701 | thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, unsigned int insn, | |
5702 | const char *iname, | |
5703 | struct displaced_step_closure *dsc) | |
5704 | { | |
5705 | if (debug_displaced) | |
5706 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x, " | |
5707 | "opcode/class '%s' unmodified\n", insn, | |
5708 | iname); | |
5709 | ||
5710 | dsc->modinsn[0] = insn; | |
5711 | ||
5712 | return 0; | |
5713 | } | |
5714 | ||
cca44b1b JB |
5715 | /* Preload instructions with immediate offset. */ |
5716 | ||
5717 | static void | |
6e39997a | 5718 | cleanup_preload (struct gdbarch *gdbarch, |
cca44b1b JB |
5719 | struct regcache *regs, struct displaced_step_closure *dsc) |
5720 | { | |
5721 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5722 | if (!dsc->u.preload.immed) | |
5723 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5724 | } | |
5725 | ||
7ff120b4 YQ |
5726 | static void |
5727 | install_preload (struct gdbarch *gdbarch, struct regcache *regs, | |
5728 | struct displaced_step_closure *dsc, unsigned int rn) | |
cca44b1b | 5729 | { |
cca44b1b | 5730 | ULONGEST rn_val; |
cca44b1b JB |
5731 | /* Preload instructions: |
5732 | ||
5733 | {pli/pld} [rn, #+/-imm] | |
5734 | -> | |
5735 | {pli/pld} [r0, #+/-imm]. */ | |
5736 | ||
36073a92 YQ |
5737 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5738 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5739 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
cca44b1b JB |
5740 | dsc->u.preload.immed = 1; |
5741 | ||
cca44b1b | 5742 | dsc->cleanup = &cleanup_preload; |
cca44b1b JB |
5743 | } |
5744 | ||
cca44b1b | 5745 | static int |
7ff120b4 | 5746 | arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
cca44b1b JB |
5747 | struct displaced_step_closure *dsc) |
5748 | { | |
5749 | unsigned int rn = bits (insn, 16, 19); | |
cca44b1b | 5750 | |
7ff120b4 YQ |
5751 | if (!insn_references_pc (insn, 0x000f0000ul)) |
5752 | return arm_copy_unmodified (gdbarch, insn, "preload", dsc); | |
cca44b1b JB |
5753 | |
5754 | if (debug_displaced) | |
5755 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5756 | (unsigned long) insn); | |
5757 | ||
7ff120b4 YQ |
5758 | dsc->modinsn[0] = insn & 0xfff0ffff; |
5759 | ||
5760 | install_preload (gdbarch, regs, dsc, rn); | |
5761 | ||
5762 | return 0; | |
5763 | } | |
5764 | ||
34518530 YQ |
5765 | static int |
5766 | thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
5767 | struct regcache *regs, struct displaced_step_closure *dsc) | |
5768 | { | |
5769 | unsigned int rn = bits (insn1, 0, 3); | |
5770 | unsigned int u_bit = bit (insn1, 7); | |
5771 | int imm12 = bits (insn2, 0, 11); | |
5772 | ULONGEST pc_val; | |
5773 | ||
5774 | if (rn != ARM_PC_REGNUM) | |
5775 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "preload", dsc); | |
5776 | ||
5777 | /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and | |
5778 | PLD (literal) Encoding T1. */ | |
5779 | if (debug_displaced) | |
5780 | fprintf_unfiltered (gdb_stdlog, | |
5781 | "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n", | |
5782 | (unsigned int) dsc->insn_addr, u_bit ? '+' : '-', | |
5783 | imm12); | |
5784 | ||
5785 | if (!u_bit) | |
5786 | imm12 = -1 * imm12; | |
5787 | ||
5788 | /* Rewrite instruction {pli/pld} PC imm12 into: | |
5789 | Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12 | |
5790 | ||
5791 | {pli/pld} [r0, r1] | |
5792 | ||
5793 | Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */ | |
5794 | ||
5795 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
5796 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5797 | ||
5798 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
5799 | ||
5800 | displaced_write_reg (regs, dsc, 0, pc_val, CANNOT_WRITE_PC); | |
5801 | displaced_write_reg (regs, dsc, 1, imm12, CANNOT_WRITE_PC); | |
5802 | dsc->u.preload.immed = 0; | |
5803 | ||
5804 | /* {pli/pld} [r0, r1] */ | |
5805 | dsc->modinsn[0] = insn1 & 0xfff0; | |
5806 | dsc->modinsn[1] = 0xf001; | |
5807 | dsc->numinsns = 2; | |
5808 | ||
5809 | dsc->cleanup = &cleanup_preload; | |
5810 | return 0; | |
5811 | } | |
5812 | ||
7ff120b4 YQ |
5813 | /* Preload instructions with register offset. */ |
5814 | ||
5815 | static void | |
5816 | install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs, | |
5817 | struct displaced_step_closure *dsc, unsigned int rn, | |
5818 | unsigned int rm) | |
5819 | { | |
5820 | ULONGEST rn_val, rm_val; | |
5821 | ||
cca44b1b JB |
5822 | /* Preload register-offset instructions: |
5823 | ||
5824 | {pli/pld} [rn, rm {, shift}] | |
5825 | -> | |
5826 | {pli/pld} [r0, r1 {, shift}]. */ | |
5827 | ||
36073a92 YQ |
5828 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5829 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5830 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5831 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
5832 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5833 | displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC); | |
cca44b1b JB |
5834 | dsc->u.preload.immed = 0; |
5835 | ||
cca44b1b | 5836 | dsc->cleanup = &cleanup_preload; |
7ff120b4 YQ |
5837 | } |
5838 | ||
5839 | static int | |
5840 | arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, | |
5841 | struct regcache *regs, | |
5842 | struct displaced_step_closure *dsc) | |
5843 | { | |
5844 | unsigned int rn = bits (insn, 16, 19); | |
5845 | unsigned int rm = bits (insn, 0, 3); | |
5846 | ||
5847 | ||
5848 | if (!insn_references_pc (insn, 0x000f000ful)) | |
5849 | return arm_copy_unmodified (gdbarch, insn, "preload reg", dsc); | |
5850 | ||
5851 | if (debug_displaced) | |
5852 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5853 | (unsigned long) insn); | |
5854 | ||
5855 | dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1; | |
cca44b1b | 5856 | |
7ff120b4 | 5857 | install_preload_reg (gdbarch, regs, dsc, rn, rm); |
cca44b1b JB |
5858 | return 0; |
5859 | } | |
5860 | ||
5861 | /* Copy/cleanup coprocessor load and store instructions. */ | |
5862 | ||
5863 | static void | |
6e39997a | 5864 | cleanup_copro_load_store (struct gdbarch *gdbarch, |
cca44b1b JB |
5865 | struct regcache *regs, |
5866 | struct displaced_step_closure *dsc) | |
5867 | { | |
36073a92 | 5868 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5869 | |
5870 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5871 | ||
5872 | if (dsc->u.ldst.writeback) | |
5873 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC); | |
5874 | } | |
5875 | ||
7ff120b4 YQ |
5876 | static void |
5877 | install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs, | |
5878 | struct displaced_step_closure *dsc, | |
5879 | int writeback, unsigned int rn) | |
cca44b1b | 5880 | { |
cca44b1b | 5881 | ULONGEST rn_val; |
cca44b1b | 5882 | |
cca44b1b JB |
5883 | /* Coprocessor load/store instructions: |
5884 | ||
5885 | {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes) | |
5886 | -> | |
5887 | {stc/stc2} [r0, #+/-imm]. | |
5888 | ||
5889 | ldc/ldc2 are handled identically. */ | |
5890 | ||
36073a92 YQ |
5891 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5892 | rn_val = displaced_read_reg (regs, dsc, rn); | |
2b16b2e3 YQ |
5893 | /* PC should be 4-byte aligned. */ |
5894 | rn_val = rn_val & 0xfffffffc; | |
cca44b1b JB |
5895 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5896 | ||
7ff120b4 | 5897 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
5898 | dsc->u.ldst.rn = rn; |
5899 | ||
7ff120b4 YQ |
5900 | dsc->cleanup = &cleanup_copro_load_store; |
5901 | } | |
5902 | ||
5903 | static int | |
5904 | arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn, | |
5905 | struct regcache *regs, | |
5906 | struct displaced_step_closure *dsc) | |
5907 | { | |
5908 | unsigned int rn = bits (insn, 16, 19); | |
5909 | ||
5910 | if (!insn_references_pc (insn, 0x000f0000ul)) | |
5911 | return arm_copy_unmodified (gdbarch, insn, "copro load/store", dsc); | |
5912 | ||
5913 | if (debug_displaced) | |
5914 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5915 | "load/store insn %.8lx\n", (unsigned long) insn); | |
5916 | ||
cca44b1b JB |
5917 | dsc->modinsn[0] = insn & 0xfff0ffff; |
5918 | ||
7ff120b4 | 5919 | install_copro_load_store (gdbarch, regs, dsc, bit (insn, 25), rn); |
cca44b1b JB |
5920 | |
5921 | return 0; | |
5922 | } | |
5923 | ||
34518530 YQ |
5924 | static int |
5925 | thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1, | |
5926 | uint16_t insn2, struct regcache *regs, | |
5927 | struct displaced_step_closure *dsc) | |
5928 | { | |
5929 | unsigned int rn = bits (insn1, 0, 3); | |
5930 | ||
5931 | if (rn != ARM_PC_REGNUM) | |
5932 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
5933 | "copro load/store", dsc); | |
5934 | ||
5935 | if (debug_displaced) | |
5936 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5937 | "load/store insn %.4x%.4x\n", insn1, insn2); | |
5938 | ||
5939 | dsc->modinsn[0] = insn1 & 0xfff0; | |
5940 | dsc->modinsn[1] = insn2; | |
5941 | dsc->numinsns = 2; | |
5942 | ||
5943 | /* This function is called for copying instruction LDC/LDC2/VLDR, which | |
5944 | doesn't support writeback, so pass 0. */ | |
5945 | install_copro_load_store (gdbarch, regs, dsc, 0, rn); | |
5946 | ||
5947 | return 0; | |
5948 | } | |
5949 | ||
cca44b1b JB |
5950 | /* Clean up branch instructions (actually perform the branch, by setting |
5951 | PC). */ | |
5952 | ||
5953 | static void | |
6e39997a | 5954 | cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
5955 | struct displaced_step_closure *dsc) |
5956 | { | |
36073a92 | 5957 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
5958 | int branch_taken = condition_true (dsc->u.branch.cond, status); |
5959 | enum pc_write_style write_pc = dsc->u.branch.exchange | |
5960 | ? BX_WRITE_PC : BRANCH_WRITE_PC; | |
5961 | ||
5962 | if (!branch_taken) | |
5963 | return; | |
5964 | ||
5965 | if (dsc->u.branch.link) | |
5966 | { | |
8c8dba6d YQ |
5967 | /* The value of LR should be the next insn of current one. In order |
5968 | not to confuse logic hanlding later insn `bx lr', if current insn mode | |
5969 | is Thumb, the bit 0 of LR value should be set to 1. */ | |
5970 | ULONGEST next_insn_addr = dsc->insn_addr + dsc->insn_size; | |
5971 | ||
5972 | if (dsc->is_thumb) | |
5973 | next_insn_addr |= 0x1; | |
5974 | ||
5975 | displaced_write_reg (regs, dsc, ARM_LR_REGNUM, next_insn_addr, | |
5976 | CANNOT_WRITE_PC); | |
cca44b1b JB |
5977 | } |
5978 | ||
bf9f652a | 5979 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc); |
cca44b1b JB |
5980 | } |
5981 | ||
5982 | /* Copy B/BL/BLX instructions with immediate destinations. */ | |
5983 | ||
7ff120b4 YQ |
5984 | static void |
5985 | install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs, | |
5986 | struct displaced_step_closure *dsc, | |
5987 | unsigned int cond, int exchange, int link, long offset) | |
5988 | { | |
5989 | /* Implement "BL<cond> <label>" as: | |
5990 | ||
5991 | Preparation: cond <- instruction condition | |
5992 | Insn: mov r0, r0 (nop) | |
5993 | Cleanup: if (condition true) { r14 <- pc; pc <- label }. | |
5994 | ||
5995 | B<cond> similar, but don't set r14 in cleanup. */ | |
5996 | ||
5997 | dsc->u.branch.cond = cond; | |
5998 | dsc->u.branch.link = link; | |
5999 | dsc->u.branch.exchange = exchange; | |
6000 | ||
2b16b2e3 YQ |
6001 | dsc->u.branch.dest = dsc->insn_addr; |
6002 | if (link && exchange) | |
6003 | /* For BLX, offset is computed from the Align (PC, 4). */ | |
6004 | dsc->u.branch.dest = dsc->u.branch.dest & 0xfffffffc; | |
6005 | ||
7ff120b4 | 6006 | if (dsc->is_thumb) |
2b16b2e3 | 6007 | dsc->u.branch.dest += 4 + offset; |
7ff120b4 | 6008 | else |
2b16b2e3 | 6009 | dsc->u.branch.dest += 8 + offset; |
7ff120b4 YQ |
6010 | |
6011 | dsc->cleanup = &cleanup_branch; | |
6012 | } | |
cca44b1b | 6013 | static int |
7ff120b4 YQ |
6014 | arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn, |
6015 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
6016 | { |
6017 | unsigned int cond = bits (insn, 28, 31); | |
6018 | int exchange = (cond == 0xf); | |
6019 | int link = exchange || bit (insn, 24); | |
cca44b1b JB |
6020 | long offset; |
6021 | ||
6022 | if (debug_displaced) | |
6023 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn " | |
6024 | "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b", | |
6025 | (unsigned long) insn); | |
cca44b1b JB |
6026 | if (exchange) |
6027 | /* For BLX, set bit 0 of the destination. The cleanup_branch function will | |
6028 | then arrange the switch into Thumb mode. */ | |
6029 | offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1; | |
6030 | else | |
6031 | offset = bits (insn, 0, 23) << 2; | |
6032 | ||
6033 | if (bit (offset, 25)) | |
6034 | offset = offset | ~0x3ffffff; | |
6035 | ||
cca44b1b JB |
6036 | dsc->modinsn[0] = ARM_NOP; |
6037 | ||
7ff120b4 | 6038 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); |
cca44b1b JB |
6039 | return 0; |
6040 | } | |
6041 | ||
34518530 YQ |
6042 | static int |
6043 | thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1, | |
6044 | uint16_t insn2, struct regcache *regs, | |
6045 | struct displaced_step_closure *dsc) | |
6046 | { | |
6047 | int link = bit (insn2, 14); | |
6048 | int exchange = link && !bit (insn2, 12); | |
6049 | int cond = INST_AL; | |
6050 | long offset = 0; | |
6051 | int j1 = bit (insn2, 13); | |
6052 | int j2 = bit (insn2, 11); | |
6053 | int s = sbits (insn1, 10, 10); | |
6054 | int i1 = !(j1 ^ bit (insn1, 10)); | |
6055 | int i2 = !(j2 ^ bit (insn1, 10)); | |
6056 | ||
6057 | if (!link && !exchange) /* B */ | |
6058 | { | |
6059 | offset = (bits (insn2, 0, 10) << 1); | |
6060 | if (bit (insn2, 12)) /* Encoding T4 */ | |
6061 | { | |
6062 | offset |= (bits (insn1, 0, 9) << 12) | |
6063 | | (i2 << 22) | |
6064 | | (i1 << 23) | |
6065 | | (s << 24); | |
6066 | cond = INST_AL; | |
6067 | } | |
6068 | else /* Encoding T3 */ | |
6069 | { | |
6070 | offset |= (bits (insn1, 0, 5) << 12) | |
6071 | | (j1 << 18) | |
6072 | | (j2 << 19) | |
6073 | | (s << 20); | |
6074 | cond = bits (insn1, 6, 9); | |
6075 | } | |
6076 | } | |
6077 | else | |
6078 | { | |
6079 | offset = (bits (insn1, 0, 9) << 12); | |
6080 | offset |= ((i2 << 22) | (i1 << 23) | (s << 24)); | |
6081 | offset |= exchange ? | |
6082 | (bits (insn2, 1, 10) << 2) : (bits (insn2, 0, 10) << 1); | |
6083 | } | |
6084 | ||
6085 | if (debug_displaced) | |
6086 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s insn " | |
6087 | "%.4x %.4x with offset %.8lx\n", | |
6088 | link ? (exchange) ? "blx" : "bl" : "b", | |
6089 | insn1, insn2, offset); | |
6090 | ||
6091 | dsc->modinsn[0] = THUMB_NOP; | |
6092 | ||
6093 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); | |
6094 | return 0; | |
6095 | } | |
6096 | ||
6097 | /* Copy B Thumb instructions. */ | |
6098 | static int | |
6099 | thumb_copy_b (struct gdbarch *gdbarch, unsigned short insn, | |
6100 | struct displaced_step_closure *dsc) | |
6101 | { | |
6102 | unsigned int cond = 0; | |
6103 | int offset = 0; | |
6104 | unsigned short bit_12_15 = bits (insn, 12, 15); | |
6105 | CORE_ADDR from = dsc->insn_addr; | |
6106 | ||
6107 | if (bit_12_15 == 0xd) | |
6108 | { | |
6109 | /* offset = SignExtend (imm8:0, 32) */ | |
6110 | offset = sbits ((insn << 1), 0, 8); | |
6111 | cond = bits (insn, 8, 11); | |
6112 | } | |
6113 | else if (bit_12_15 == 0xe) /* Encoding T2 */ | |
6114 | { | |
6115 | offset = sbits ((insn << 1), 0, 11); | |
6116 | cond = INST_AL; | |
6117 | } | |
6118 | ||
6119 | if (debug_displaced) | |
6120 | fprintf_unfiltered (gdb_stdlog, | |
6121 | "displaced: copying b immediate insn %.4x " | |
6122 | "with offset %d\n", insn, offset); | |
6123 | ||
6124 | dsc->u.branch.cond = cond; | |
6125 | dsc->u.branch.link = 0; | |
6126 | dsc->u.branch.exchange = 0; | |
6127 | dsc->u.branch.dest = from + 4 + offset; | |
6128 | ||
6129 | dsc->modinsn[0] = THUMB_NOP; | |
6130 | ||
6131 | dsc->cleanup = &cleanup_branch; | |
6132 | ||
6133 | return 0; | |
6134 | } | |
6135 | ||
cca44b1b JB |
6136 | /* Copy BX/BLX with register-specified destinations. */ |
6137 | ||
7ff120b4 YQ |
6138 | static void |
6139 | install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6140 | struct displaced_step_closure *dsc, int link, | |
6141 | unsigned int cond, unsigned int rm) | |
cca44b1b | 6142 | { |
cca44b1b JB |
6143 | /* Implement {BX,BLX}<cond> <reg>" as: |
6144 | ||
6145 | Preparation: cond <- instruction condition | |
6146 | Insn: mov r0, r0 (nop) | |
6147 | Cleanup: if (condition true) { r14 <- pc; pc <- dest; }. | |
6148 | ||
6149 | Don't set r14 in cleanup for BX. */ | |
6150 | ||
36073a92 | 6151 | dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6152 | |
6153 | dsc->u.branch.cond = cond; | |
6154 | dsc->u.branch.link = link; | |
cca44b1b | 6155 | |
7ff120b4 | 6156 | dsc->u.branch.exchange = 1; |
cca44b1b JB |
6157 | |
6158 | dsc->cleanup = &cleanup_branch; | |
7ff120b4 | 6159 | } |
cca44b1b | 6160 | |
7ff120b4 YQ |
6161 | static int |
6162 | arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn, | |
6163 | struct regcache *regs, struct displaced_step_closure *dsc) | |
6164 | { | |
6165 | unsigned int cond = bits (insn, 28, 31); | |
6166 | /* BX: x12xxx1x | |
6167 | BLX: x12xxx3x. */ | |
6168 | int link = bit (insn, 5); | |
6169 | unsigned int rm = bits (insn, 0, 3); | |
6170 | ||
6171 | if (debug_displaced) | |
6172 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx", | |
6173 | (unsigned long) insn); | |
6174 | ||
6175 | dsc->modinsn[0] = ARM_NOP; | |
6176 | ||
6177 | install_bx_blx_reg (gdbarch, regs, dsc, link, cond, rm); | |
cca44b1b JB |
6178 | return 0; |
6179 | } | |
6180 | ||
34518530 YQ |
6181 | static int |
6182 | thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn, | |
6183 | struct regcache *regs, | |
6184 | struct displaced_step_closure *dsc) | |
6185 | { | |
6186 | int link = bit (insn, 7); | |
6187 | unsigned int rm = bits (insn, 3, 6); | |
6188 | ||
6189 | if (debug_displaced) | |
6190 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x", | |
6191 | (unsigned short) insn); | |
6192 | ||
6193 | dsc->modinsn[0] = THUMB_NOP; | |
6194 | ||
6195 | install_bx_blx_reg (gdbarch, regs, dsc, link, INST_AL, rm); | |
6196 | ||
6197 | return 0; | |
6198 | } | |
6199 | ||
6200 | ||
0963b4bd | 6201 | /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */ |
cca44b1b JB |
6202 | |
6203 | static void | |
6e39997a | 6204 | cleanup_alu_imm (struct gdbarch *gdbarch, |
cca44b1b JB |
6205 | struct regcache *regs, struct displaced_step_closure *dsc) |
6206 | { | |
36073a92 | 6207 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6208 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
6209 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6210 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6211 | } | |
6212 | ||
6213 | static int | |
7ff120b4 YQ |
6214 | arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
6215 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
6216 | { |
6217 | unsigned int rn = bits (insn, 16, 19); | |
6218 | unsigned int rd = bits (insn, 12, 15); | |
6219 | unsigned int op = bits (insn, 21, 24); | |
6220 | int is_mov = (op == 0xd); | |
6221 | ULONGEST rd_val, rn_val; | |
cca44b1b JB |
6222 | |
6223 | if (!insn_references_pc (insn, 0x000ff000ul)) | |
7ff120b4 | 6224 | return arm_copy_unmodified (gdbarch, insn, "ALU immediate", dsc); |
cca44b1b JB |
6225 | |
6226 | if (debug_displaced) | |
6227 | fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn " | |
6228 | "%.8lx\n", is_mov ? "move" : "ALU", | |
6229 | (unsigned long) insn); | |
6230 | ||
6231 | /* Instruction is of form: | |
6232 | ||
6233 | <op><cond> rd, [rn,] #imm | |
6234 | ||
6235 | Rewrite as: | |
6236 | ||
6237 | Preparation: tmp1, tmp2 <- r0, r1; | |
6238 | r0, r1 <- rd, rn | |
6239 | Insn: <op><cond> r0, r1, #imm | |
6240 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
6241 | */ | |
6242 | ||
36073a92 YQ |
6243 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6244 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6245 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6246 | rd_val = displaced_read_reg (regs, dsc, rd); | |
cca44b1b JB |
6247 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6248 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6249 | dsc->rd = rd; | |
6250 | ||
6251 | if (is_mov) | |
6252 | dsc->modinsn[0] = insn & 0xfff00fff; | |
6253 | else | |
6254 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000; | |
6255 | ||
6256 | dsc->cleanup = &cleanup_alu_imm; | |
6257 | ||
6258 | return 0; | |
6259 | } | |
6260 | ||
34518530 YQ |
6261 | static int |
6262 | thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
6263 | uint16_t insn2, struct regcache *regs, | |
6264 | struct displaced_step_closure *dsc) | |
6265 | { | |
6266 | unsigned int op = bits (insn1, 5, 8); | |
6267 | unsigned int rn, rm, rd; | |
6268 | ULONGEST rd_val, rn_val; | |
6269 | ||
6270 | rn = bits (insn1, 0, 3); /* Rn */ | |
6271 | rm = bits (insn2, 0, 3); /* Rm */ | |
6272 | rd = bits (insn2, 8, 11); /* Rd */ | |
6273 | ||
6274 | /* This routine is only called for instruction MOV. */ | |
6275 | gdb_assert (op == 0x2 && rn == 0xf); | |
6276 | ||
6277 | if (rm != ARM_PC_REGNUM && rd != ARM_PC_REGNUM) | |
6278 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ALU imm", dsc); | |
6279 | ||
6280 | if (debug_displaced) | |
6281 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x%.4x\n", | |
6282 | "ALU", insn1, insn2); | |
6283 | ||
6284 | /* Instruction is of form: | |
6285 | ||
6286 | <op><cond> rd, [rn,] #imm | |
6287 | ||
6288 | Rewrite as: | |
6289 | ||
6290 | Preparation: tmp1, tmp2 <- r0, r1; | |
6291 | r0, r1 <- rd, rn | |
6292 | Insn: <op><cond> r0, r1, #imm | |
6293 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
6294 | */ | |
6295 | ||
6296 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
6297 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6298 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6299 | rd_val = displaced_read_reg (regs, dsc, rd); | |
6300 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); | |
6301 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6302 | dsc->rd = rd; | |
6303 | ||
6304 | dsc->modinsn[0] = insn1; | |
6305 | dsc->modinsn[1] = ((insn2 & 0xf0f0) | 0x1); | |
6306 | dsc->numinsns = 2; | |
6307 | ||
6308 | dsc->cleanup = &cleanup_alu_imm; | |
6309 | ||
6310 | return 0; | |
6311 | } | |
6312 | ||
cca44b1b JB |
6313 | /* Copy/cleanup arithmetic/logic insns with register RHS. */ |
6314 | ||
6315 | static void | |
6e39997a | 6316 | cleanup_alu_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
6317 | struct regcache *regs, struct displaced_step_closure *dsc) |
6318 | { | |
6319 | ULONGEST rd_val; | |
6320 | int i; | |
6321 | ||
36073a92 | 6322 | rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6323 | |
6324 | for (i = 0; i < 3; i++) | |
6325 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
6326 | ||
6327 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6328 | } | |
6329 | ||
7ff120b4 YQ |
6330 | static void |
6331 | install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6332 | struct displaced_step_closure *dsc, | |
6333 | unsigned int rd, unsigned int rn, unsigned int rm) | |
cca44b1b | 6334 | { |
cca44b1b | 6335 | ULONGEST rd_val, rn_val, rm_val; |
cca44b1b | 6336 | |
cca44b1b JB |
6337 | /* Instruction is of form: |
6338 | ||
6339 | <op><cond> rd, [rn,] rm [, <shift>] | |
6340 | ||
6341 | Rewrite as: | |
6342 | ||
6343 | Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2; | |
6344 | r0, r1, r2 <- rd, rn, rm | |
6345 | Insn: <op><cond> r0, r1, r2 [, <shift>] | |
6346 | Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3 | |
6347 | */ | |
6348 | ||
36073a92 YQ |
6349 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6350 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6351 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
6352 | rd_val = displaced_read_reg (regs, dsc, rd); | |
6353 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6354 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
6355 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6356 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6357 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
6358 | dsc->rd = rd; | |
6359 | ||
7ff120b4 YQ |
6360 | dsc->cleanup = &cleanup_alu_reg; |
6361 | } | |
6362 | ||
6363 | static int | |
6364 | arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
6365 | struct displaced_step_closure *dsc) | |
6366 | { | |
6367 | unsigned int op = bits (insn, 21, 24); | |
6368 | int is_mov = (op == 0xd); | |
6369 | ||
6370 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
6371 | return arm_copy_unmodified (gdbarch, insn, "ALU reg", dsc); | |
6372 | ||
6373 | if (debug_displaced) | |
6374 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n", | |
6375 | is_mov ? "move" : "ALU", (unsigned long) insn); | |
6376 | ||
cca44b1b JB |
6377 | if (is_mov) |
6378 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2; | |
6379 | else | |
6380 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002; | |
6381 | ||
7ff120b4 YQ |
6382 | install_alu_reg (gdbarch, regs, dsc, bits (insn, 12, 15), bits (insn, 16, 19), |
6383 | bits (insn, 0, 3)); | |
cca44b1b JB |
6384 | return 0; |
6385 | } | |
6386 | ||
34518530 YQ |
6387 | static int |
6388 | thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn, | |
6389 | struct regcache *regs, | |
6390 | struct displaced_step_closure *dsc) | |
6391 | { | |
6392 | unsigned rn, rm, rd; | |
6393 | ||
6394 | rd = bits (insn, 3, 6); | |
6395 | rn = (bit (insn, 7) << 3) | bits (insn, 0, 2); | |
6396 | rm = 2; | |
6397 | ||
6398 | if (rd != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
6399 | return thumb_copy_unmodified_16bit (gdbarch, insn, "ALU reg", dsc); | |
6400 | ||
6401 | if (debug_displaced) | |
6402 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x\n", | |
6403 | "ALU", (unsigned short) insn); | |
6404 | ||
6405 | dsc->modinsn[0] = ((insn & 0xff00) | 0x08); | |
6406 | ||
6407 | install_alu_reg (gdbarch, regs, dsc, rd, rn, rm); | |
6408 | ||
6409 | return 0; | |
6410 | } | |
6411 | ||
cca44b1b JB |
6412 | /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */ |
6413 | ||
6414 | static void | |
6e39997a | 6415 | cleanup_alu_shifted_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
6416 | struct regcache *regs, |
6417 | struct displaced_step_closure *dsc) | |
6418 | { | |
36073a92 | 6419 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
6420 | int i; |
6421 | ||
6422 | for (i = 0; i < 4; i++) | |
6423 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
6424 | ||
6425 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
6426 | } | |
6427 | ||
7ff120b4 YQ |
6428 | static void |
6429 | install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs, | |
6430 | struct displaced_step_closure *dsc, | |
6431 | unsigned int rd, unsigned int rn, unsigned int rm, | |
6432 | unsigned rs) | |
cca44b1b | 6433 | { |
7ff120b4 | 6434 | int i; |
cca44b1b | 6435 | ULONGEST rd_val, rn_val, rm_val, rs_val; |
cca44b1b | 6436 | |
cca44b1b JB |
6437 | /* Instruction is of form: |
6438 | ||
6439 | <op><cond> rd, [rn,] rm, <shift> rs | |
6440 | ||
6441 | Rewrite as: | |
6442 | ||
6443 | Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3 | |
6444 | r0, r1, r2, r3 <- rd, rn, rm, rs | |
6445 | Insn: <op><cond> r0, r1, r2, <shift> r3 | |
6446 | Cleanup: tmp5 <- r0 | |
6447 | r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4 | |
6448 | rd <- tmp5 | |
6449 | */ | |
6450 | ||
6451 | for (i = 0; i < 4; i++) | |
36073a92 | 6452 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b | 6453 | |
36073a92 YQ |
6454 | rd_val = displaced_read_reg (regs, dsc, rd); |
6455 | rn_val = displaced_read_reg (regs, dsc, rn); | |
6456 | rm_val = displaced_read_reg (regs, dsc, rm); | |
6457 | rs_val = displaced_read_reg (regs, dsc, rs); | |
cca44b1b JB |
6458 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
6459 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
6460 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
6461 | displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC); | |
6462 | dsc->rd = rd; | |
7ff120b4 YQ |
6463 | dsc->cleanup = &cleanup_alu_shifted_reg; |
6464 | } | |
6465 | ||
6466 | static int | |
6467 | arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn, | |
6468 | struct regcache *regs, | |
6469 | struct displaced_step_closure *dsc) | |
6470 | { | |
6471 | unsigned int op = bits (insn, 21, 24); | |
6472 | int is_mov = (op == 0xd); | |
6473 | unsigned int rd, rn, rm, rs; | |
6474 | ||
6475 | if (!insn_references_pc (insn, 0x000fff0ful)) | |
6476 | return arm_copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc); | |
6477 | ||
6478 | if (debug_displaced) | |
6479 | fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn " | |
6480 | "%.8lx\n", is_mov ? "move" : "ALU", | |
6481 | (unsigned long) insn); | |
6482 | ||
6483 | rn = bits (insn, 16, 19); | |
6484 | rm = bits (insn, 0, 3); | |
6485 | rs = bits (insn, 8, 11); | |
6486 | rd = bits (insn, 12, 15); | |
cca44b1b JB |
6487 | |
6488 | if (is_mov) | |
6489 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302; | |
6490 | else | |
6491 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302; | |
6492 | ||
7ff120b4 | 6493 | install_alu_shifted_reg (gdbarch, regs, dsc, rd, rn, rm, rs); |
cca44b1b JB |
6494 | |
6495 | return 0; | |
6496 | } | |
6497 | ||
6498 | /* Clean up load instructions. */ | |
6499 | ||
6500 | static void | |
6e39997a | 6501 | cleanup_load (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6502 | struct displaced_step_closure *dsc) |
6503 | { | |
6504 | ULONGEST rt_val, rt_val2 = 0, rn_val; | |
cca44b1b | 6505 | |
36073a92 | 6506 | rt_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b | 6507 | if (dsc->u.ldst.xfersize == 8) |
36073a92 YQ |
6508 | rt_val2 = displaced_read_reg (regs, dsc, 1); |
6509 | rn_val = displaced_read_reg (regs, dsc, 2); | |
cca44b1b JB |
6510 | |
6511 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
6512 | if (dsc->u.ldst.xfersize > 4) | |
6513 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6514 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
6515 | if (!dsc->u.ldst.immed) | |
6516 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
6517 | ||
6518 | /* Handle register writeback. */ | |
6519 | if (dsc->u.ldst.writeback) | |
6520 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
6521 | /* Put result in right place. */ | |
6522 | displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC); | |
6523 | if (dsc->u.ldst.xfersize == 8) | |
6524 | displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC); | |
6525 | } | |
6526 | ||
6527 | /* Clean up store instructions. */ | |
6528 | ||
6529 | static void | |
6e39997a | 6530 | cleanup_store (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6531 | struct displaced_step_closure *dsc) |
6532 | { | |
36073a92 | 6533 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 2); |
cca44b1b JB |
6534 | |
6535 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
6536 | if (dsc->u.ldst.xfersize > 4) | |
6537 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
6538 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
6539 | if (!dsc->u.ldst.immed) | |
6540 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
6541 | if (!dsc->u.ldst.restore_r4) | |
6542 | displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC); | |
6543 | ||
6544 | /* Writeback. */ | |
6545 | if (dsc->u.ldst.writeback) | |
6546 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
6547 | } | |
6548 | ||
6549 | /* Copy "extra" load/store instructions. These are halfword/doubleword | |
6550 | transfers, which have a different encoding to byte/word transfers. */ | |
6551 | ||
6552 | static int | |
7ff120b4 YQ |
6553 | arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged, |
6554 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
6555 | { |
6556 | unsigned int op1 = bits (insn, 20, 24); | |
6557 | unsigned int op2 = bits (insn, 5, 6); | |
6558 | unsigned int rt = bits (insn, 12, 15); | |
6559 | unsigned int rn = bits (insn, 16, 19); | |
6560 | unsigned int rm = bits (insn, 0, 3); | |
6561 | char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1}; | |
6562 | char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2}; | |
6563 | int immed = (op1 & 0x4) != 0; | |
6564 | int opcode; | |
6565 | ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0; | |
cca44b1b JB |
6566 | |
6567 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
7ff120b4 | 6568 | return arm_copy_unmodified (gdbarch, insn, "extra load/store", dsc); |
cca44b1b JB |
6569 | |
6570 | if (debug_displaced) | |
6571 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store " | |
6572 | "insn %.8lx\n", unpriveleged ? "unpriveleged " : "", | |
6573 | (unsigned long) insn); | |
6574 | ||
6575 | opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4; | |
6576 | ||
6577 | if (opcode < 0) | |
6578 | internal_error (__FILE__, __LINE__, | |
6579 | _("copy_extra_ld_st: instruction decode error")); | |
6580 | ||
36073a92 YQ |
6581 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6582 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
6583 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 6584 | if (!immed) |
36073a92 | 6585 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 6586 | |
36073a92 | 6587 | rt_val = displaced_read_reg (regs, dsc, rt); |
cca44b1b | 6588 | if (bytesize[opcode] == 8) |
36073a92 YQ |
6589 | rt_val2 = displaced_read_reg (regs, dsc, rt + 1); |
6590 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6591 | if (!immed) |
36073a92 | 6592 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6593 | |
6594 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
6595 | if (bytesize[opcode] == 8) | |
6596 | displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC); | |
6597 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
6598 | if (!immed) | |
6599 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
6600 | ||
6601 | dsc->rd = rt; | |
6602 | dsc->u.ldst.xfersize = bytesize[opcode]; | |
6603 | dsc->u.ldst.rn = rn; | |
6604 | dsc->u.ldst.immed = immed; | |
6605 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; | |
6606 | dsc->u.ldst.restore_r4 = 0; | |
6607 | ||
6608 | if (immed) | |
6609 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm] | |
6610 | -> | |
6611 | {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */ | |
6612 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
6613 | else | |
6614 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm] | |
6615 | -> | |
6616 | {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */ | |
6617 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
6618 | ||
6619 | dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store; | |
6620 | ||
6621 | return 0; | |
6622 | } | |
6623 | ||
0f6f04ba | 6624 | /* Copy byte/half word/word loads and stores. */ |
cca44b1b | 6625 | |
7ff120b4 | 6626 | static void |
0f6f04ba YQ |
6627 | install_load_store (struct gdbarch *gdbarch, struct regcache *regs, |
6628 | struct displaced_step_closure *dsc, int load, | |
6629 | int immed, int writeback, int size, int usermode, | |
6630 | int rt, int rm, int rn) | |
cca44b1b | 6631 | { |
cca44b1b | 6632 | ULONGEST rt_val, rn_val, rm_val = 0; |
cca44b1b | 6633 | |
36073a92 YQ |
6634 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
6635 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 6636 | if (!immed) |
36073a92 | 6637 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 6638 | if (!load) |
36073a92 | 6639 | dsc->tmp[4] = displaced_read_reg (regs, dsc, 4); |
cca44b1b | 6640 | |
36073a92 YQ |
6641 | rt_val = displaced_read_reg (regs, dsc, rt); |
6642 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 6643 | if (!immed) |
36073a92 | 6644 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
6645 | |
6646 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
6647 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
6648 | if (!immed) | |
6649 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
cca44b1b | 6650 | dsc->rd = rt; |
0f6f04ba | 6651 | dsc->u.ldst.xfersize = size; |
cca44b1b JB |
6652 | dsc->u.ldst.rn = rn; |
6653 | dsc->u.ldst.immed = immed; | |
7ff120b4 | 6654 | dsc->u.ldst.writeback = writeback; |
cca44b1b JB |
6655 | |
6656 | /* To write PC we can do: | |
6657 | ||
494e194e YQ |
6658 | Before this sequence of instructions: |
6659 | r0 is the PC value got from displaced_read_reg, so r0 = from + 8; | |
6660 | r2 is the Rn value got from dispalced_read_reg. | |
6661 | ||
6662 | Insn1: push {pc} Write address of STR instruction + offset on stack | |
6663 | Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset | |
6664 | Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc | |
6665 | = addr(Insn1) + offset - addr(Insn3) - 8 | |
6666 | = offset - 16 | |
6667 | Insn4: add r4, r4, #8 r4 = offset - 8 | |
6668 | Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8 | |
6669 | = from + offset | |
6670 | Insn6: str r0, [r2, #imm] (or str r0, [r2, r3]) | |
cca44b1b JB |
6671 | |
6672 | Otherwise we don't know what value to write for PC, since the offset is | |
494e194e YQ |
6673 | architecture-dependent (sometimes PC+8, sometimes PC+12). More details |
6674 | of this can be found in Section "Saving from r15" in | |
6675 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */ | |
cca44b1b | 6676 | |
7ff120b4 YQ |
6677 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; |
6678 | } | |
6679 | ||
34518530 YQ |
6680 | |
6681 | static int | |
6682 | thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1, | |
6683 | uint16_t insn2, struct regcache *regs, | |
6684 | struct displaced_step_closure *dsc, int size) | |
6685 | { | |
6686 | unsigned int u_bit = bit (insn1, 7); | |
6687 | unsigned int rt = bits (insn2, 12, 15); | |
6688 | int imm12 = bits (insn2, 0, 11); | |
6689 | ULONGEST pc_val; | |
6690 | ||
6691 | if (debug_displaced) | |
6692 | fprintf_unfiltered (gdb_stdlog, | |
6693 | "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n", | |
6694 | (unsigned int) dsc->insn_addr, rt, u_bit ? '+' : '-', | |
6695 | imm12); | |
6696 | ||
6697 | if (!u_bit) | |
6698 | imm12 = -1 * imm12; | |
6699 | ||
6700 | /* Rewrite instruction LDR Rt imm12 into: | |
6701 | ||
6702 | Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12 | |
6703 | ||
6704 | LDR R0, R2, R3, | |
6705 | ||
6706 | Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */ | |
6707 | ||
6708 | ||
6709 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
6710 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
6711 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
6712 | ||
6713 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
6714 | ||
6715 | pc_val = pc_val & 0xfffffffc; | |
6716 | ||
6717 | displaced_write_reg (regs, dsc, 2, pc_val, CANNOT_WRITE_PC); | |
6718 | displaced_write_reg (regs, dsc, 3, imm12, CANNOT_WRITE_PC); | |
6719 | ||
6720 | dsc->rd = rt; | |
6721 | ||
6722 | dsc->u.ldst.xfersize = size; | |
6723 | dsc->u.ldst.immed = 0; | |
6724 | dsc->u.ldst.writeback = 0; | |
6725 | dsc->u.ldst.restore_r4 = 0; | |
6726 | ||
6727 | /* LDR R0, R2, R3 */ | |
6728 | dsc->modinsn[0] = 0xf852; | |
6729 | dsc->modinsn[1] = 0x3; | |
6730 | dsc->numinsns = 2; | |
6731 | ||
6732 | dsc->cleanup = &cleanup_load; | |
6733 | ||
6734 | return 0; | |
6735 | } | |
6736 | ||
6737 | static int | |
6738 | thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1, | |
6739 | uint16_t insn2, struct regcache *regs, | |
6740 | struct displaced_step_closure *dsc, | |
6741 | int writeback, int immed) | |
6742 | { | |
6743 | unsigned int rt = bits (insn2, 12, 15); | |
6744 | unsigned int rn = bits (insn1, 0, 3); | |
6745 | unsigned int rm = bits (insn2, 0, 3); /* Only valid if !immed. */ | |
6746 | /* In LDR (register), there is also a register Rm, which is not allowed to | |
6747 | be PC, so we don't have to check it. */ | |
6748 | ||
6749 | if (rt != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) | |
6750 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "load", | |
6751 | dsc); | |
6752 | ||
6753 | if (debug_displaced) | |
6754 | fprintf_unfiltered (gdb_stdlog, | |
6755 | "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n", | |
6756 | rt, rn, insn1, insn2); | |
6757 | ||
6758 | install_load_store (gdbarch, regs, dsc, 1, immed, writeback, 4, | |
6759 | 0, rt, rm, rn); | |
6760 | ||
6761 | dsc->u.ldst.restore_r4 = 0; | |
6762 | ||
6763 | if (immed) | |
6764 | /* ldr[b]<cond> rt, [rn, #imm], etc. | |
6765 | -> | |
6766 | ldr[b]<cond> r0, [r2, #imm]. */ | |
6767 | { | |
6768 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
6769 | dsc->modinsn[1] = insn2 & 0x0fff; | |
6770 | } | |
6771 | else | |
6772 | /* ldr[b]<cond> rt, [rn, rm], etc. | |
6773 | -> | |
6774 | ldr[b]<cond> r0, [r2, r3]. */ | |
6775 | { | |
6776 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; | |
6777 | dsc->modinsn[1] = (insn2 & 0x0ff0) | 0x3; | |
6778 | } | |
6779 | ||
6780 | dsc->numinsns = 2; | |
6781 | ||
6782 | return 0; | |
6783 | } | |
6784 | ||
6785 | ||
7ff120b4 YQ |
6786 | static int |
6787 | arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn, | |
6788 | struct regcache *regs, | |
6789 | struct displaced_step_closure *dsc, | |
0f6f04ba | 6790 | int load, int size, int usermode) |
7ff120b4 YQ |
6791 | { |
6792 | int immed = !bit (insn, 25); | |
6793 | int writeback = (bit (insn, 24) == 0 || bit (insn, 21) != 0); | |
6794 | unsigned int rt = bits (insn, 12, 15); | |
6795 | unsigned int rn = bits (insn, 16, 19); | |
6796 | unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */ | |
6797 | ||
6798 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
6799 | return arm_copy_unmodified (gdbarch, insn, "load/store", dsc); | |
6800 | ||
6801 | if (debug_displaced) | |
6802 | fprintf_unfiltered (gdb_stdlog, | |
6803 | "displaced: copying %s%s r%d [r%d] insn %.8lx\n", | |
0f6f04ba YQ |
6804 | load ? (size == 1 ? "ldrb" : "ldr") |
6805 | : (size == 1 ? "strb" : "str"), usermode ? "t" : "", | |
7ff120b4 YQ |
6806 | rt, rn, |
6807 | (unsigned long) insn); | |
6808 | ||
0f6f04ba YQ |
6809 | install_load_store (gdbarch, regs, dsc, load, immed, writeback, size, |
6810 | usermode, rt, rm, rn); | |
7ff120b4 | 6811 | |
bf9f652a | 6812 | if (load || rt != ARM_PC_REGNUM) |
cca44b1b JB |
6813 | { |
6814 | dsc->u.ldst.restore_r4 = 0; | |
6815 | ||
6816 | if (immed) | |
6817 | /* {ldr,str}[b]<cond> rt, [rn, #imm], etc. | |
6818 | -> | |
6819 | {ldr,str}[b]<cond> r0, [r2, #imm]. */ | |
6820 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
6821 | else | |
6822 | /* {ldr,str}[b]<cond> rt, [rn, rm], etc. | |
6823 | -> | |
6824 | {ldr,str}[b]<cond> r0, [r2, r3]. */ | |
6825 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
6826 | } | |
6827 | else | |
6828 | { | |
6829 | /* We need to use r4 as scratch. Make sure it's restored afterwards. */ | |
6830 | dsc->u.ldst.restore_r4 = 1; | |
494e194e YQ |
6831 | dsc->modinsn[0] = 0xe92d8000; /* push {pc} */ |
6832 | dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */ | |
cca44b1b JB |
6833 | dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */ |
6834 | dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */ | |
6835 | dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */ | |
6836 | ||
6837 | /* As above. */ | |
6838 | if (immed) | |
6839 | dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000; | |
6840 | else | |
6841 | dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003; | |
6842 | ||
cca44b1b JB |
6843 | dsc->numinsns = 6; |
6844 | } | |
6845 | ||
6846 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; | |
6847 | ||
6848 | return 0; | |
6849 | } | |
6850 | ||
6851 | /* Cleanup LDM instructions with fully-populated register list. This is an | |
6852 | unfortunate corner case: it's impossible to implement correctly by modifying | |
6853 | the instruction. The issue is as follows: we have an instruction, | |
6854 | ||
6855 | ldm rN, {r0-r15} | |
6856 | ||
6857 | which we must rewrite to avoid loading PC. A possible solution would be to | |
6858 | do the load in two halves, something like (with suitable cleanup | |
6859 | afterwards): | |
6860 | ||
6861 | mov r8, rN | |
6862 | ldm[id][ab] r8!, {r0-r7} | |
6863 | str r7, <temp> | |
6864 | ldm[id][ab] r8, {r7-r14} | |
6865 | <bkpt> | |
6866 | ||
6867 | but at present there's no suitable place for <temp>, since the scratch space | |
6868 | is overwritten before the cleanup routine is called. For now, we simply | |
6869 | emulate the instruction. */ | |
6870 | ||
6871 | static void | |
6872 | cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs, | |
6873 | struct displaced_step_closure *dsc) | |
6874 | { | |
cca44b1b JB |
6875 | int inc = dsc->u.block.increment; |
6876 | int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0; | |
6877 | int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4); | |
6878 | uint32_t regmask = dsc->u.block.regmask; | |
6879 | int regno = inc ? 0 : 15; | |
6880 | CORE_ADDR xfer_addr = dsc->u.block.xfer_addr; | |
6881 | int exception_return = dsc->u.block.load && dsc->u.block.user | |
6882 | && (regmask & 0x8000) != 0; | |
36073a92 | 6883 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6884 | int do_transfer = condition_true (dsc->u.block.cond, status); |
6885 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6886 | ||
6887 | if (!do_transfer) | |
6888 | return; | |
6889 | ||
6890 | /* If the instruction is ldm rN, {...pc}^, I don't think there's anything | |
6891 | sensible we can do here. Complain loudly. */ | |
6892 | if (exception_return) | |
6893 | error (_("Cannot single-step exception return")); | |
6894 | ||
6895 | /* We don't handle any stores here for now. */ | |
6896 | gdb_assert (dsc->u.block.load != 0); | |
6897 | ||
6898 | if (debug_displaced) | |
6899 | fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: " | |
6900 | "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm", | |
6901 | dsc->u.block.increment ? "inc" : "dec", | |
6902 | dsc->u.block.before ? "before" : "after"); | |
6903 | ||
6904 | while (regmask) | |
6905 | { | |
6906 | uint32_t memword; | |
6907 | ||
6908 | if (inc) | |
bf9f652a | 6909 | while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0) |
cca44b1b JB |
6910 | regno++; |
6911 | else | |
6912 | while (regno >= 0 && (regmask & (1 << regno)) == 0) | |
6913 | regno--; | |
6914 | ||
6915 | xfer_addr += bump_before; | |
6916 | ||
6917 | memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order); | |
6918 | displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC); | |
6919 | ||
6920 | xfer_addr += bump_after; | |
6921 | ||
6922 | regmask &= ~(1 << regno); | |
6923 | } | |
6924 | ||
6925 | if (dsc->u.block.writeback) | |
6926 | displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr, | |
6927 | CANNOT_WRITE_PC); | |
6928 | } | |
6929 | ||
6930 | /* Clean up an STM which included the PC in the register list. */ | |
6931 | ||
6932 | static void | |
6933 | cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs, | |
6934 | struct displaced_step_closure *dsc) | |
6935 | { | |
36073a92 | 6936 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6937 | int store_executed = condition_true (dsc->u.block.cond, status); |
6938 | CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask); | |
6939 | CORE_ADDR stm_insn_addr; | |
6940 | uint32_t pc_val; | |
6941 | long offset; | |
6942 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6943 | ||
6944 | /* If condition code fails, there's nothing else to do. */ | |
6945 | if (!store_executed) | |
6946 | return; | |
6947 | ||
6948 | if (dsc->u.block.increment) | |
6949 | { | |
6950 | pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs; | |
6951 | ||
6952 | if (dsc->u.block.before) | |
6953 | pc_stored_at += 4; | |
6954 | } | |
6955 | else | |
6956 | { | |
6957 | pc_stored_at = dsc->u.block.xfer_addr; | |
6958 | ||
6959 | if (dsc->u.block.before) | |
6960 | pc_stored_at -= 4; | |
6961 | } | |
6962 | ||
6963 | pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order); | |
6964 | stm_insn_addr = dsc->scratch_base; | |
6965 | offset = pc_val - stm_insn_addr; | |
6966 | ||
6967 | if (debug_displaced) | |
6968 | fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for " | |
6969 | "STM instruction\n", offset); | |
6970 | ||
6971 | /* Rewrite the stored PC to the proper value for the non-displaced original | |
6972 | instruction. */ | |
6973 | write_memory_unsigned_integer (pc_stored_at, 4, byte_order, | |
6974 | dsc->insn_addr + offset); | |
6975 | } | |
6976 | ||
6977 | /* Clean up an LDM which includes the PC in the register list. We clumped all | |
6978 | the registers in the transferred list into a contiguous range r0...rX (to | |
6979 | avoid loading PC directly and losing control of the debugged program), so we | |
6980 | must undo that here. */ | |
6981 | ||
6982 | static void | |
6e39997a | 6983 | cleanup_block_load_pc (struct gdbarch *gdbarch, |
cca44b1b JB |
6984 | struct regcache *regs, |
6985 | struct displaced_step_closure *dsc) | |
6986 | { | |
36073a92 | 6987 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
22e048c9 | 6988 | int load_executed = condition_true (dsc->u.block.cond, status); |
bf9f652a | 6989 | unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM; |
cca44b1b JB |
6990 | unsigned int regs_loaded = bitcount (mask); |
6991 | unsigned int num_to_shuffle = regs_loaded, clobbered; | |
6992 | ||
6993 | /* The method employed here will fail if the register list is fully populated | |
6994 | (we need to avoid loading PC directly). */ | |
6995 | gdb_assert (num_to_shuffle < 16); | |
6996 | ||
6997 | if (!load_executed) | |
6998 | return; | |
6999 | ||
7000 | clobbered = (1 << num_to_shuffle) - 1; | |
7001 | ||
7002 | while (num_to_shuffle > 0) | |
7003 | { | |
7004 | if ((mask & (1 << write_reg)) != 0) | |
7005 | { | |
7006 | unsigned int read_reg = num_to_shuffle - 1; | |
7007 | ||
7008 | if (read_reg != write_reg) | |
7009 | { | |
36073a92 | 7010 | ULONGEST rval = displaced_read_reg (regs, dsc, read_reg); |
cca44b1b JB |
7011 | displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC); |
7012 | if (debug_displaced) | |
7013 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move " | |
7014 | "loaded register r%d to r%d\n"), read_reg, | |
7015 | write_reg); | |
7016 | } | |
7017 | else if (debug_displaced) | |
7018 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register " | |
7019 | "r%d already in the right place\n"), | |
7020 | write_reg); | |
7021 | ||
7022 | clobbered &= ~(1 << write_reg); | |
7023 | ||
7024 | num_to_shuffle--; | |
7025 | } | |
7026 | ||
7027 | write_reg--; | |
7028 | } | |
7029 | ||
7030 | /* Restore any registers we scribbled over. */ | |
7031 | for (write_reg = 0; clobbered != 0; write_reg++) | |
7032 | { | |
7033 | if ((clobbered & (1 << write_reg)) != 0) | |
7034 | { | |
7035 | displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg], | |
7036 | CANNOT_WRITE_PC); | |
7037 | if (debug_displaced) | |
7038 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored " | |
7039 | "clobbered register r%d\n"), write_reg); | |
7040 | clobbered &= ~(1 << write_reg); | |
7041 | } | |
7042 | } | |
7043 | ||
7044 | /* Perform register writeback manually. */ | |
7045 | if (dsc->u.block.writeback) | |
7046 | { | |
7047 | ULONGEST new_rn_val = dsc->u.block.xfer_addr; | |
7048 | ||
7049 | if (dsc->u.block.increment) | |
7050 | new_rn_val += regs_loaded * 4; | |
7051 | else | |
7052 | new_rn_val -= regs_loaded * 4; | |
7053 | ||
7054 | displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val, | |
7055 | CANNOT_WRITE_PC); | |
7056 | } | |
7057 | } | |
7058 | ||
7059 | /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur | |
7060 | in user-level code (in particular exception return, ldm rn, {...pc}^). */ | |
7061 | ||
7062 | static int | |
7ff120b4 YQ |
7063 | arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, |
7064 | struct regcache *regs, | |
7065 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7066 | { |
7067 | int load = bit (insn, 20); | |
7068 | int user = bit (insn, 22); | |
7069 | int increment = bit (insn, 23); | |
7070 | int before = bit (insn, 24); | |
7071 | int writeback = bit (insn, 21); | |
7072 | int rn = bits (insn, 16, 19); | |
cca44b1b | 7073 | |
0963b4bd MS |
7074 | /* Block transfers which don't mention PC can be run directly |
7075 | out-of-line. */ | |
bf9f652a | 7076 | if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0) |
7ff120b4 | 7077 | return arm_copy_unmodified (gdbarch, insn, "ldm/stm", dsc); |
cca44b1b | 7078 | |
bf9f652a | 7079 | if (rn == ARM_PC_REGNUM) |
cca44b1b | 7080 | { |
0963b4bd MS |
7081 | warning (_("displaced: Unpredictable LDM or STM with " |
7082 | "base register r15")); | |
7ff120b4 | 7083 | return arm_copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc); |
cca44b1b JB |
7084 | } |
7085 | ||
7086 | if (debug_displaced) | |
7087 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " | |
7088 | "%.8lx\n", (unsigned long) insn); | |
7089 | ||
36073a92 | 7090 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
cca44b1b JB |
7091 | dsc->u.block.rn = rn; |
7092 | ||
7093 | dsc->u.block.load = load; | |
7094 | dsc->u.block.user = user; | |
7095 | dsc->u.block.increment = increment; | |
7096 | dsc->u.block.before = before; | |
7097 | dsc->u.block.writeback = writeback; | |
7098 | dsc->u.block.cond = bits (insn, 28, 31); | |
7099 | ||
7100 | dsc->u.block.regmask = insn & 0xffff; | |
7101 | ||
7102 | if (load) | |
7103 | { | |
7104 | if ((insn & 0xffff) == 0xffff) | |
7105 | { | |
7106 | /* LDM with a fully-populated register list. This case is | |
7107 | particularly tricky. Implement for now by fully emulating the | |
7108 | instruction (which might not behave perfectly in all cases, but | |
7109 | these instructions should be rare enough for that not to matter | |
7110 | too much). */ | |
7111 | dsc->modinsn[0] = ARM_NOP; | |
7112 | ||
7113 | dsc->cleanup = &cleanup_block_load_all; | |
7114 | } | |
7115 | else | |
7116 | { | |
7117 | /* LDM of a list of registers which includes PC. Implement by | |
7118 | rewriting the list of registers to be transferred into a | |
7119 | contiguous chunk r0...rX before doing the transfer, then shuffling | |
7120 | registers into the correct places in the cleanup routine. */ | |
7121 | unsigned int regmask = insn & 0xffff; | |
7122 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
7123 | unsigned int to = 0, from = 0, i, new_rn; | |
7124 | ||
7125 | for (i = 0; i < num_in_list; i++) | |
36073a92 | 7126 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b JB |
7127 | |
7128 | /* Writeback makes things complicated. We need to avoid clobbering | |
7129 | the base register with one of the registers in our modified | |
7130 | register list, but just using a different register can't work in | |
7131 | all cases, e.g.: | |
7132 | ||
7133 | ldm r14!, {r0-r13,pc} | |
7134 | ||
7135 | which would need to be rewritten as: | |
7136 | ||
7137 | ldm rN!, {r0-r14} | |
7138 | ||
7139 | but that can't work, because there's no free register for N. | |
7140 | ||
7141 | Solve this by turning off the writeback bit, and emulating | |
7142 | writeback manually in the cleanup routine. */ | |
7143 | ||
7144 | if (writeback) | |
7145 | insn &= ~(1 << 21); | |
7146 | ||
7147 | new_regmask = (1 << num_in_list) - 1; | |
7148 | ||
7149 | if (debug_displaced) | |
7150 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
7151 | "{..., pc}: original reg list %.4x, modified " | |
7152 | "list %.4x\n"), rn, writeback ? "!" : "", | |
7153 | (int) insn & 0xffff, new_regmask); | |
7154 | ||
7155 | dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff); | |
7156 | ||
7157 | dsc->cleanup = &cleanup_block_load_pc; | |
7158 | } | |
7159 | } | |
7160 | else | |
7161 | { | |
7162 | /* STM of a list of registers which includes PC. Run the instruction | |
7163 | as-is, but out of line: this will store the wrong value for the PC, | |
7164 | so we must manually fix up the memory in the cleanup routine. | |
7165 | Doing things this way has the advantage that we can auto-detect | |
7166 | the offset of the PC write (which is architecture-dependent) in | |
7167 | the cleanup routine. */ | |
7168 | dsc->modinsn[0] = insn; | |
7169 | ||
7170 | dsc->cleanup = &cleanup_block_store_pc; | |
7171 | } | |
7172 | ||
7173 | return 0; | |
7174 | } | |
7175 | ||
34518530 YQ |
7176 | static int |
7177 | thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
7178 | struct regcache *regs, | |
7179 | struct displaced_step_closure *dsc) | |
cca44b1b | 7180 | { |
34518530 YQ |
7181 | int rn = bits (insn1, 0, 3); |
7182 | int load = bit (insn1, 4); | |
7183 | int writeback = bit (insn1, 5); | |
cca44b1b | 7184 | |
34518530 YQ |
7185 | /* Block transfers which don't mention PC can be run directly |
7186 | out-of-line. */ | |
7187 | if (rn != ARM_PC_REGNUM && (insn2 & 0x8000) == 0) | |
7188 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ldm/stm", dsc); | |
7ff120b4 | 7189 | |
34518530 YQ |
7190 | if (rn == ARM_PC_REGNUM) |
7191 | { | |
7192 | warning (_("displaced: Unpredictable LDM or STM with " | |
7193 | "base register r15")); | |
7194 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7195 | "unpredictable ldm/stm", dsc); | |
7196 | } | |
cca44b1b JB |
7197 | |
7198 | if (debug_displaced) | |
34518530 YQ |
7199 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " |
7200 | "%.4x%.4x\n", insn1, insn2); | |
cca44b1b | 7201 | |
34518530 YQ |
7202 | /* Clear bit 13, since it should be always zero. */ |
7203 | dsc->u.block.regmask = (insn2 & 0xdfff); | |
7204 | dsc->u.block.rn = rn; | |
cca44b1b | 7205 | |
34518530 YQ |
7206 | dsc->u.block.load = load; |
7207 | dsc->u.block.user = 0; | |
7208 | dsc->u.block.increment = bit (insn1, 7); | |
7209 | dsc->u.block.before = bit (insn1, 8); | |
7210 | dsc->u.block.writeback = writeback; | |
7211 | dsc->u.block.cond = INST_AL; | |
7212 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 7213 | |
34518530 YQ |
7214 | if (load) |
7215 | { | |
7216 | if (dsc->u.block.regmask == 0xffff) | |
7217 | { | |
7218 | /* This branch is impossible to happen. */ | |
7219 | gdb_assert (0); | |
7220 | } | |
7221 | else | |
7222 | { | |
7223 | unsigned int regmask = dsc->u.block.regmask; | |
7224 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
7225 | unsigned int to = 0, from = 0, i, new_rn; | |
7226 | ||
7227 | for (i = 0; i < num_in_list; i++) | |
7228 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
7229 | ||
7230 | if (writeback) | |
7231 | insn1 &= ~(1 << 5); | |
7232 | ||
7233 | new_regmask = (1 << num_in_list) - 1; | |
7234 | ||
7235 | if (debug_displaced) | |
7236 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
7237 | "{..., pc}: original reg list %.4x, modified " | |
7238 | "list %.4x\n"), rn, writeback ? "!" : "", | |
7239 | (int) dsc->u.block.regmask, new_regmask); | |
7240 | ||
7241 | dsc->modinsn[0] = insn1; | |
7242 | dsc->modinsn[1] = (new_regmask & 0xffff); | |
7243 | dsc->numinsns = 2; | |
7244 | ||
7245 | dsc->cleanup = &cleanup_block_load_pc; | |
7246 | } | |
7247 | } | |
7248 | else | |
7249 | { | |
7250 | dsc->modinsn[0] = insn1; | |
7251 | dsc->modinsn[1] = insn2; | |
7252 | dsc->numinsns = 2; | |
7253 | dsc->cleanup = &cleanup_block_store_pc; | |
7254 | } | |
7255 | return 0; | |
7256 | } | |
7257 | ||
7258 | /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden | |
7259 | for Linux, where some SVC instructions must be treated specially. */ | |
7260 | ||
7261 | static void | |
7262 | cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
7263 | struct displaced_step_closure *dsc) | |
7264 | { | |
7265 | CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size; | |
7266 | ||
7267 | if (debug_displaced) | |
7268 | fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at " | |
7269 | "%.8lx\n", (unsigned long) resume_addr); | |
7270 | ||
7271 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC); | |
7272 | } | |
7273 | ||
7274 | ||
7275 | /* Common copy routine for svc instruciton. */ | |
7276 | ||
7277 | static int | |
7278 | install_svc (struct gdbarch *gdbarch, struct regcache *regs, | |
7279 | struct displaced_step_closure *dsc) | |
7280 | { | |
7281 | /* Preparation: none. | |
7282 | Insn: unmodified svc. | |
7283 | Cleanup: pc <- insn_addr + insn_size. */ | |
7284 | ||
7285 | /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next | |
7286 | instruction. */ | |
7287 | dsc->wrote_to_pc = 1; | |
7288 | ||
7289 | /* Allow OS-specific code to override SVC handling. */ | |
bd18283a YQ |
7290 | if (dsc->u.svc.copy_svc_os) |
7291 | return dsc->u.svc.copy_svc_os (gdbarch, regs, dsc); | |
7292 | else | |
7293 | { | |
7294 | dsc->cleanup = &cleanup_svc; | |
7295 | return 0; | |
7296 | } | |
34518530 YQ |
7297 | } |
7298 | ||
7299 | static int | |
7300 | arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn, | |
7301 | struct regcache *regs, struct displaced_step_closure *dsc) | |
7302 | { | |
7303 | ||
7304 | if (debug_displaced) | |
7305 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n", | |
7306 | (unsigned long) insn); | |
7307 | ||
7308 | dsc->modinsn[0] = insn; | |
7309 | ||
7310 | return install_svc (gdbarch, regs, dsc); | |
7311 | } | |
7312 | ||
7313 | static int | |
7314 | thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn, | |
7315 | struct regcache *regs, struct displaced_step_closure *dsc) | |
7316 | { | |
7317 | ||
7318 | if (debug_displaced) | |
7319 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.4x\n", | |
7320 | insn); | |
bd18283a | 7321 | |
34518530 YQ |
7322 | dsc->modinsn[0] = insn; |
7323 | ||
7324 | return install_svc (gdbarch, regs, dsc); | |
cca44b1b JB |
7325 | } |
7326 | ||
7327 | /* Copy undefined instructions. */ | |
7328 | ||
7329 | static int | |
7ff120b4 YQ |
7330 | arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn, |
7331 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7332 | { |
7333 | if (debug_displaced) | |
0963b4bd MS |
7334 | fprintf_unfiltered (gdb_stdlog, |
7335 | "displaced: copying undefined insn %.8lx\n", | |
cca44b1b JB |
7336 | (unsigned long) insn); |
7337 | ||
7338 | dsc->modinsn[0] = insn; | |
7339 | ||
7340 | return 0; | |
7341 | } | |
7342 | ||
34518530 YQ |
7343 | static int |
7344 | thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, | |
7345 | struct displaced_step_closure *dsc) | |
7346 | { | |
7347 | ||
7348 | if (debug_displaced) | |
7349 | fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn " | |
7350 | "%.4x %.4x\n", (unsigned short) insn1, | |
7351 | (unsigned short) insn2); | |
7352 | ||
7353 | dsc->modinsn[0] = insn1; | |
7354 | dsc->modinsn[1] = insn2; | |
7355 | dsc->numinsns = 2; | |
7356 | ||
7357 | return 0; | |
7358 | } | |
7359 | ||
cca44b1b JB |
7360 | /* Copy unpredictable instructions. */ |
7361 | ||
7362 | static int | |
7ff120b4 YQ |
7363 | arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn, |
7364 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7365 | { |
7366 | if (debug_displaced) | |
7367 | fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn " | |
7368 | "%.8lx\n", (unsigned long) insn); | |
7369 | ||
7370 | dsc->modinsn[0] = insn; | |
7371 | ||
7372 | return 0; | |
7373 | } | |
7374 | ||
7375 | /* The decode_* functions are instruction decoding helpers. They mostly follow | |
7376 | the presentation in the ARM ARM. */ | |
7377 | ||
7378 | static int | |
7ff120b4 YQ |
7379 | arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn, |
7380 | struct regcache *regs, | |
7381 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7382 | { |
7383 | unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7); | |
7384 | unsigned int rn = bits (insn, 16, 19); | |
7385 | ||
7386 | if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0) | |
7ff120b4 | 7387 | return arm_copy_unmodified (gdbarch, insn, "cps", dsc); |
cca44b1b | 7388 | else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1) |
7ff120b4 | 7389 | return arm_copy_unmodified (gdbarch, insn, "setend", dsc); |
cca44b1b | 7390 | else if ((op1 & 0x60) == 0x20) |
7ff120b4 | 7391 | return arm_copy_unmodified (gdbarch, insn, "neon dataproc", dsc); |
cca44b1b | 7392 | else if ((op1 & 0x71) == 0x40) |
7ff120b4 YQ |
7393 | return arm_copy_unmodified (gdbarch, insn, "neon elt/struct load/store", |
7394 | dsc); | |
cca44b1b | 7395 | else if ((op1 & 0x77) == 0x41) |
7ff120b4 | 7396 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 7397 | else if ((op1 & 0x77) == 0x45) |
7ff120b4 | 7398 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pli. */ |
cca44b1b JB |
7399 | else if ((op1 & 0x77) == 0x51) |
7400 | { | |
7401 | if (rn != 0xf) | |
7ff120b4 | 7402 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b | 7403 | else |
7ff120b4 | 7404 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
7405 | } |
7406 | else if ((op1 & 0x77) == 0x55) | |
7ff120b4 | 7407 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
cca44b1b JB |
7408 | else if (op1 == 0x57) |
7409 | switch (op2) | |
7410 | { | |
7ff120b4 YQ |
7411 | case 0x1: return arm_copy_unmodified (gdbarch, insn, "clrex", dsc); |
7412 | case 0x4: return arm_copy_unmodified (gdbarch, insn, "dsb", dsc); | |
7413 | case 0x5: return arm_copy_unmodified (gdbarch, insn, "dmb", dsc); | |
7414 | case 0x6: return arm_copy_unmodified (gdbarch, insn, "isb", dsc); | |
7415 | default: return arm_copy_unpred (gdbarch, insn, dsc); | |
cca44b1b JB |
7416 | } |
7417 | else if ((op1 & 0x63) == 0x43) | |
7ff120b4 | 7418 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b JB |
7419 | else if ((op2 & 0x1) == 0x0) |
7420 | switch (op1 & ~0x80) | |
7421 | { | |
7422 | case 0x61: | |
7ff120b4 | 7423 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
cca44b1b | 7424 | case 0x65: |
7ff120b4 | 7425 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */ |
cca44b1b JB |
7426 | case 0x71: case 0x75: |
7427 | /* pld/pldw reg. */ | |
7ff120b4 | 7428 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7429 | case 0x63: case 0x67: case 0x73: case 0x77: |
7ff120b4 | 7430 | return arm_copy_unpred (gdbarch, insn, dsc); |
cca44b1b | 7431 | default: |
7ff120b4 | 7432 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7433 | } |
7434 | else | |
7ff120b4 | 7435 | return arm_copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */ |
cca44b1b JB |
7436 | } |
7437 | ||
7438 | static int | |
7ff120b4 YQ |
7439 | arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn, |
7440 | struct regcache *regs, | |
7441 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7442 | { |
7443 | if (bit (insn, 27) == 0) | |
7ff120b4 | 7444 | return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7445 | /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */ |
7446 | else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20)) | |
7447 | { | |
7448 | case 0x0: case 0x2: | |
7ff120b4 | 7449 | return arm_copy_unmodified (gdbarch, insn, "srs", dsc); |
cca44b1b JB |
7450 | |
7451 | case 0x1: case 0x3: | |
7ff120b4 | 7452 | return arm_copy_unmodified (gdbarch, insn, "rfe", dsc); |
cca44b1b JB |
7453 | |
7454 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7ff120b4 | 7455 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7456 | |
7457 | case 0x8: | |
7458 | switch ((insn & 0xe00000) >> 21) | |
7459 | { | |
7460 | case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7: | |
7461 | /* stc/stc2. */ | |
7ff120b4 | 7462 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7463 | |
7464 | case 0x2: | |
7ff120b4 | 7465 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b JB |
7466 | |
7467 | default: | |
7ff120b4 | 7468 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7469 | } |
7470 | ||
7471 | case 0x9: | |
7472 | { | |
7473 | int rn_f = (bits (insn, 16, 19) == 0xf); | |
7474 | switch ((insn & 0xe00000) >> 21) | |
7475 | { | |
7476 | case 0x1: case 0x3: | |
7477 | /* ldc/ldc2 imm (undefined for rn == pc). */ | |
7ff120b4 YQ |
7478 | return rn_f ? arm_copy_undef (gdbarch, insn, dsc) |
7479 | : arm_copy_copro_load_store (gdbarch, insn, regs, dsc); | |
cca44b1b JB |
7480 | |
7481 | case 0x2: | |
7ff120b4 | 7482 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
7483 | |
7484 | case 0x4: case 0x5: case 0x6: case 0x7: | |
7485 | /* ldc/ldc2 lit (undefined for rn != pc). */ | |
7ff120b4 YQ |
7486 | return rn_f ? arm_copy_copro_load_store (gdbarch, insn, regs, dsc) |
7487 | : arm_copy_undef (gdbarch, insn, dsc); | |
cca44b1b JB |
7488 | |
7489 | default: | |
7ff120b4 | 7490 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7491 | } |
7492 | } | |
7493 | ||
7494 | case 0xa: | |
7ff120b4 | 7495 | return arm_copy_unmodified (gdbarch, insn, "stc/stc2", dsc); |
cca44b1b JB |
7496 | |
7497 | case 0xb: | |
7498 | if (bits (insn, 16, 19) == 0xf) | |
7499 | /* ldc/ldc2 lit. */ | |
7ff120b4 | 7500 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 7501 | else |
7ff120b4 | 7502 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7503 | |
7504 | case 0xc: | |
7505 | if (bit (insn, 4)) | |
7ff120b4 | 7506 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 7507 | else |
7ff120b4 | 7508 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7509 | |
7510 | case 0xd: | |
7511 | if (bit (insn, 4)) | |
7ff120b4 | 7512 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 7513 | else |
7ff120b4 | 7514 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7515 | |
7516 | default: | |
7ff120b4 | 7517 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7518 | } |
7519 | } | |
7520 | ||
7521 | /* Decode miscellaneous instructions in dp/misc encoding space. */ | |
7522 | ||
7523 | static int | |
7ff120b4 YQ |
7524 | arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn, |
7525 | struct regcache *regs, | |
7526 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7527 | { |
7528 | unsigned int op2 = bits (insn, 4, 6); | |
7529 | unsigned int op = bits (insn, 21, 22); | |
7530 | unsigned int op1 = bits (insn, 16, 19); | |
7531 | ||
7532 | switch (op2) | |
7533 | { | |
7534 | case 0x0: | |
7ff120b4 | 7535 | return arm_copy_unmodified (gdbarch, insn, "mrs/msr", dsc); |
cca44b1b JB |
7536 | |
7537 | case 0x1: | |
7538 | if (op == 0x1) /* bx. */ | |
7ff120b4 | 7539 | return arm_copy_bx_blx_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7540 | else if (op == 0x3) |
7ff120b4 | 7541 | return arm_copy_unmodified (gdbarch, insn, "clz", dsc); |
cca44b1b | 7542 | else |
7ff120b4 | 7543 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7544 | |
7545 | case 0x2: | |
7546 | if (op == 0x1) | |
7547 | /* Not really supported. */ | |
7ff120b4 | 7548 | return arm_copy_unmodified (gdbarch, insn, "bxj", dsc); |
cca44b1b | 7549 | else |
7ff120b4 | 7550 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7551 | |
7552 | case 0x3: | |
7553 | if (op == 0x1) | |
7ff120b4 | 7554 | return arm_copy_bx_blx_reg (gdbarch, insn, |
0963b4bd | 7555 | regs, dsc); /* blx register. */ |
cca44b1b | 7556 | else |
7ff120b4 | 7557 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7558 | |
7559 | case 0x5: | |
7ff120b4 | 7560 | return arm_copy_unmodified (gdbarch, insn, "saturating add/sub", dsc); |
cca44b1b JB |
7561 | |
7562 | case 0x7: | |
7563 | if (op == 0x1) | |
7ff120b4 | 7564 | return arm_copy_unmodified (gdbarch, insn, "bkpt", dsc); |
cca44b1b JB |
7565 | else if (op == 0x3) |
7566 | /* Not really supported. */ | |
7ff120b4 | 7567 | return arm_copy_unmodified (gdbarch, insn, "smc", dsc); |
cca44b1b JB |
7568 | |
7569 | default: | |
7ff120b4 | 7570 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7571 | } |
7572 | } | |
7573 | ||
7574 | static int | |
7ff120b4 YQ |
7575 | arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, |
7576 | struct regcache *regs, | |
7577 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7578 | { |
7579 | if (bit (insn, 25)) | |
7580 | switch (bits (insn, 20, 24)) | |
7581 | { | |
7582 | case 0x10: | |
7ff120b4 | 7583 | return arm_copy_unmodified (gdbarch, insn, "movw", dsc); |
cca44b1b JB |
7584 | |
7585 | case 0x14: | |
7ff120b4 | 7586 | return arm_copy_unmodified (gdbarch, insn, "movt", dsc); |
cca44b1b JB |
7587 | |
7588 | case 0x12: case 0x16: | |
7ff120b4 | 7589 | return arm_copy_unmodified (gdbarch, insn, "msr imm", dsc); |
cca44b1b JB |
7590 | |
7591 | default: | |
7ff120b4 | 7592 | return arm_copy_alu_imm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7593 | } |
7594 | else | |
7595 | { | |
7596 | uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7); | |
7597 | ||
7598 | if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0) | |
7ff120b4 | 7599 | return arm_copy_alu_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7600 | else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1) |
7ff120b4 | 7601 | return arm_copy_alu_shifted_reg (gdbarch, insn, regs, dsc); |
cca44b1b | 7602 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0) |
7ff120b4 | 7603 | return arm_decode_miscellaneous (gdbarch, insn, regs, dsc); |
cca44b1b | 7604 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8) |
7ff120b4 | 7605 | return arm_copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc); |
cca44b1b | 7606 | else if ((op1 & 0x10) == 0x00 && op2 == 0x9) |
7ff120b4 | 7607 | return arm_copy_unmodified (gdbarch, insn, "mul/mla", dsc); |
cca44b1b | 7608 | else if ((op1 & 0x10) == 0x10 && op2 == 0x9) |
7ff120b4 | 7609 | return arm_copy_unmodified (gdbarch, insn, "synch", dsc); |
cca44b1b JB |
7610 | else if (op2 == 0xb || (op2 & 0xd) == 0xd) |
7611 | /* 2nd arg means "unpriveleged". */ | |
7ff120b4 YQ |
7612 | return arm_copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs, |
7613 | dsc); | |
cca44b1b JB |
7614 | } |
7615 | ||
7616 | /* Should be unreachable. */ | |
7617 | return 1; | |
7618 | } | |
7619 | ||
7620 | static int | |
7ff120b4 YQ |
7621 | arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn, |
7622 | struct regcache *regs, | |
7623 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7624 | { |
7625 | int a = bit (insn, 25), b = bit (insn, 4); | |
7626 | uint32_t op1 = bits (insn, 20, 24); | |
7627 | int rn_f = bits (insn, 16, 19) == 0xf; | |
7628 | ||
7629 | if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02) | |
7630 | || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b)) | |
0f6f04ba | 7631 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 0); |
cca44b1b JB |
7632 | else if ((!a && (op1 & 0x17) == 0x02) |
7633 | || (a && (op1 & 0x17) == 0x02 && !b)) | |
0f6f04ba | 7634 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 1); |
cca44b1b JB |
7635 | else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03) |
7636 | || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b)) | |
0f6f04ba | 7637 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 0); |
cca44b1b JB |
7638 | else if ((!a && (op1 & 0x17) == 0x03) |
7639 | || (a && (op1 & 0x17) == 0x03 && !b)) | |
0f6f04ba | 7640 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 1); |
cca44b1b JB |
7641 | else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06) |
7642 | || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b)) | |
7ff120b4 | 7643 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0); |
cca44b1b JB |
7644 | else if ((!a && (op1 & 0x17) == 0x06) |
7645 | || (a && (op1 & 0x17) == 0x06 && !b)) | |
7ff120b4 | 7646 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1); |
cca44b1b JB |
7647 | else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07) |
7648 | || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b)) | |
7ff120b4 | 7649 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0); |
cca44b1b JB |
7650 | else if ((!a && (op1 & 0x17) == 0x07) |
7651 | || (a && (op1 & 0x17) == 0x07 && !b)) | |
7ff120b4 | 7652 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1); |
cca44b1b JB |
7653 | |
7654 | /* Should be unreachable. */ | |
7655 | return 1; | |
7656 | } | |
7657 | ||
7658 | static int | |
7ff120b4 YQ |
7659 | arm_decode_media (struct gdbarch *gdbarch, uint32_t insn, |
7660 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7661 | { |
7662 | switch (bits (insn, 20, 24)) | |
7663 | { | |
7664 | case 0x00: case 0x01: case 0x02: case 0x03: | |
7ff120b4 | 7665 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc); |
cca44b1b JB |
7666 | |
7667 | case 0x04: case 0x05: case 0x06: case 0x07: | |
7ff120b4 | 7668 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc); |
cca44b1b JB |
7669 | |
7670 | case 0x08: case 0x09: case 0x0a: case 0x0b: | |
7671 | case 0x0c: case 0x0d: case 0x0e: case 0x0f: | |
7ff120b4 | 7672 | return arm_copy_unmodified (gdbarch, insn, |
cca44b1b JB |
7673 | "decode/pack/unpack/saturate/reverse", dsc); |
7674 | ||
7675 | case 0x18: | |
7676 | if (bits (insn, 5, 7) == 0) /* op2. */ | |
7677 | { | |
7678 | if (bits (insn, 12, 15) == 0xf) | |
7ff120b4 | 7679 | return arm_copy_unmodified (gdbarch, insn, "usad8", dsc); |
cca44b1b | 7680 | else |
7ff120b4 | 7681 | return arm_copy_unmodified (gdbarch, insn, "usada8", dsc); |
cca44b1b JB |
7682 | } |
7683 | else | |
7ff120b4 | 7684 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7685 | |
7686 | case 0x1a: case 0x1b: | |
7687 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 7688 | return arm_copy_unmodified (gdbarch, insn, "sbfx", dsc); |
cca44b1b | 7689 | else |
7ff120b4 | 7690 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7691 | |
7692 | case 0x1c: case 0x1d: | |
7693 | if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */ | |
7694 | { | |
7695 | if (bits (insn, 0, 3) == 0xf) | |
7ff120b4 | 7696 | return arm_copy_unmodified (gdbarch, insn, "bfc", dsc); |
cca44b1b | 7697 | else |
7ff120b4 | 7698 | return arm_copy_unmodified (gdbarch, insn, "bfi", dsc); |
cca44b1b JB |
7699 | } |
7700 | else | |
7ff120b4 | 7701 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7702 | |
7703 | case 0x1e: case 0x1f: | |
7704 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
7ff120b4 | 7705 | return arm_copy_unmodified (gdbarch, insn, "ubfx", dsc); |
cca44b1b | 7706 | else |
7ff120b4 | 7707 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b JB |
7708 | } |
7709 | ||
7710 | /* Should be unreachable. */ | |
7711 | return 1; | |
7712 | } | |
7713 | ||
7714 | static int | |
7ff120b4 YQ |
7715 | arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn, |
7716 | struct regcache *regs, | |
7717 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7718 | { |
7719 | if (bit (insn, 25)) | |
7ff120b4 | 7720 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
cca44b1b | 7721 | else |
7ff120b4 | 7722 | return arm_copy_block_xfer (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7723 | } |
7724 | ||
7725 | static int | |
7ff120b4 YQ |
7726 | arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn, |
7727 | struct regcache *regs, | |
7728 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
7729 | { |
7730 | unsigned int opcode = bits (insn, 20, 24); | |
7731 | ||
7732 | switch (opcode) | |
7733 | { | |
7734 | case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */ | |
7ff120b4 | 7735 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc); |
cca44b1b JB |
7736 | |
7737 | case 0x08: case 0x0a: case 0x0c: case 0x0e: | |
7738 | case 0x12: case 0x16: | |
7ff120b4 | 7739 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc); |
cca44b1b JB |
7740 | |
7741 | case 0x09: case 0x0b: case 0x0d: case 0x0f: | |
7742 | case 0x13: case 0x17: | |
7ff120b4 | 7743 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc); |
cca44b1b JB |
7744 | |
7745 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
7746 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
7747 | /* Note: no writeback for these instructions. Bit 25 will always be | |
7748 | zero though (via caller), so the following works OK. */ | |
7ff120b4 | 7749 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7750 | } |
7751 | ||
7752 | /* Should be unreachable. */ | |
7753 | return 1; | |
7754 | } | |
7755 | ||
34518530 YQ |
7756 | /* Decode shifted register instructions. */ |
7757 | ||
7758 | static int | |
7759 | thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1, | |
7760 | uint16_t insn2, struct regcache *regs, | |
7761 | struct displaced_step_closure *dsc) | |
7762 | { | |
7763 | /* PC is only allowed to be used in instruction MOV. */ | |
7764 | ||
7765 | unsigned int op = bits (insn1, 5, 8); | |
7766 | unsigned int rn = bits (insn1, 0, 3); | |
7767 | ||
7768 | if (op == 0x2 && rn == 0xf) /* MOV */ | |
7769 | return thumb2_copy_alu_imm (gdbarch, insn1, insn2, regs, dsc); | |
7770 | else | |
7771 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7772 | "dp (shift reg)", dsc); | |
7773 | } | |
7774 | ||
7775 | ||
7776 | /* Decode extension register load/store. Exactly the same as | |
7777 | arm_decode_ext_reg_ld_st. */ | |
7778 | ||
7779 | static int | |
7780 | thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1, | |
7781 | uint16_t insn2, struct regcache *regs, | |
7782 | struct displaced_step_closure *dsc) | |
7783 | { | |
7784 | unsigned int opcode = bits (insn1, 4, 8); | |
7785 | ||
7786 | switch (opcode) | |
7787 | { | |
7788 | case 0x04: case 0x05: | |
7789 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7790 | "vfp/neon vmov", dsc); | |
7791 | ||
7792 | case 0x08: case 0x0c: /* 01x00 */ | |
7793 | case 0x0a: case 0x0e: /* 01x10 */ | |
7794 | case 0x12: case 0x16: /* 10x10 */ | |
7795 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7796 | "vfp/neon vstm/vpush", dsc); | |
7797 | ||
7798 | case 0x09: case 0x0d: /* 01x01 */ | |
7799 | case 0x0b: case 0x0f: /* 01x11 */ | |
7800 | case 0x13: case 0x17: /* 10x11 */ | |
7801 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7802 | "vfp/neon vldm/vpop", dsc); | |
7803 | ||
7804 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
7805 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7806 | "vstr", dsc); | |
7807 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
7808 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, regs, dsc); | |
7809 | } | |
7810 | ||
7811 | /* Should be unreachable. */ | |
7812 | return 1; | |
7813 | } | |
7814 | ||
cca44b1b | 7815 | static int |
7ff120b4 YQ |
7816 | arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to, |
7817 | struct regcache *regs, struct displaced_step_closure *dsc) | |
cca44b1b JB |
7818 | { |
7819 | unsigned int op1 = bits (insn, 20, 25); | |
7820 | int op = bit (insn, 4); | |
7821 | unsigned int coproc = bits (insn, 8, 11); | |
7822 | unsigned int rn = bits (insn, 16, 19); | |
7823 | ||
7824 | if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa) | |
7ff120b4 | 7825 | return arm_decode_ext_reg_ld_st (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7826 | else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00 |
7827 | && (coproc & 0xe) != 0xa) | |
7828 | /* stc/stc2. */ | |
7ff120b4 | 7829 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b JB |
7830 | else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00 |
7831 | && (coproc & 0xe) != 0xa) | |
7832 | /* ldc/ldc2 imm/lit. */ | |
7ff120b4 | 7833 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
cca44b1b | 7834 | else if ((op1 & 0x3e) == 0x00) |
7ff120b4 | 7835 | return arm_copy_undef (gdbarch, insn, dsc); |
cca44b1b | 7836 | else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa) |
7ff120b4 | 7837 | return arm_copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc); |
cca44b1b | 7838 | else if (op1 == 0x04 && (coproc & 0xe) != 0xa) |
7ff120b4 | 7839 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
cca44b1b | 7840 | else if (op1 == 0x05 && (coproc & 0xe) != 0xa) |
7ff120b4 | 7841 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
cca44b1b JB |
7842 | else if ((op1 & 0x30) == 0x20 && !op) |
7843 | { | |
7844 | if ((coproc & 0xe) == 0xa) | |
7ff120b4 | 7845 | return arm_copy_unmodified (gdbarch, insn, "vfp dataproc", dsc); |
cca44b1b | 7846 | else |
7ff120b4 | 7847 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
cca44b1b JB |
7848 | } |
7849 | else if ((op1 & 0x30) == 0x20 && op) | |
7ff120b4 | 7850 | return arm_copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc); |
cca44b1b | 7851 | else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 7852 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
cca44b1b | 7853 | else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa) |
7ff120b4 | 7854 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
cca44b1b | 7855 | else if ((op1 & 0x30) == 0x30) |
7ff120b4 | 7856 | return arm_copy_svc (gdbarch, insn, regs, dsc); |
cca44b1b | 7857 | else |
7ff120b4 | 7858 | return arm_copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */ |
cca44b1b JB |
7859 | } |
7860 | ||
34518530 YQ |
7861 | static int |
7862 | thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1, | |
7863 | uint16_t insn2, struct regcache *regs, | |
7864 | struct displaced_step_closure *dsc) | |
7865 | { | |
7866 | unsigned int coproc = bits (insn2, 8, 11); | |
7867 | unsigned int op1 = bits (insn1, 4, 9); | |
7868 | unsigned int bit_5_8 = bits (insn1, 5, 8); | |
7869 | unsigned int bit_9 = bit (insn1, 9); | |
7870 | unsigned int bit_4 = bit (insn1, 4); | |
7871 | unsigned int rn = bits (insn1, 0, 3); | |
7872 | ||
7873 | if (bit_9 == 0) | |
7874 | { | |
7875 | if (bit_5_8 == 2) | |
7876 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7877 | "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2", | |
7878 | dsc); | |
7879 | else if (bit_5_8 == 0) /* UNDEFINED. */ | |
7880 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
7881 | else | |
7882 | { | |
7883 | /*coproc is 101x. SIMD/VFP, ext registers load/store. */ | |
7884 | if ((coproc & 0xe) == 0xa) | |
7885 | return thumb2_decode_ext_reg_ld_st (gdbarch, insn1, insn2, regs, | |
7886 | dsc); | |
7887 | else /* coproc is not 101x. */ | |
7888 | { | |
7889 | if (bit_4 == 0) /* STC/STC2. */ | |
7890 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
7891 | "stc/stc2", dsc); | |
7892 | else /* LDC/LDC2 {literal, immeidate}. */ | |
7893 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, | |
7894 | regs, dsc); | |
7895 | } | |
7896 | } | |
7897 | } | |
7898 | else | |
7899 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "coproc", dsc); | |
7900 | ||
7901 | return 0; | |
7902 | } | |
7903 | ||
7904 | static void | |
7905 | install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs, | |
7906 | struct displaced_step_closure *dsc, int rd) | |
7907 | { | |
7908 | /* ADR Rd, #imm | |
7909 | ||
7910 | Rewrite as: | |
7911 | ||
7912 | Preparation: Rd <- PC | |
7913 | Insn: ADD Rd, #imm | |
7914 | Cleanup: Null. | |
7915 | */ | |
7916 | ||
7917 | /* Rd <- PC */ | |
7918 | int val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
7919 | displaced_write_reg (regs, dsc, rd, val, CANNOT_WRITE_PC); | |
7920 | } | |
7921 | ||
7922 | static int | |
7923 | thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs, | |
7924 | struct displaced_step_closure *dsc, | |
7925 | int rd, unsigned int imm) | |
7926 | { | |
7927 | ||
7928 | /* Encoding T2: ADDS Rd, #imm */ | |
7929 | dsc->modinsn[0] = (0x3000 | (rd << 8) | imm); | |
7930 | ||
7931 | install_pc_relative (gdbarch, regs, dsc, rd); | |
7932 | ||
7933 | return 0; | |
7934 | } | |
7935 | ||
7936 | static int | |
7937 | thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn, | |
7938 | struct regcache *regs, | |
7939 | struct displaced_step_closure *dsc) | |
7940 | { | |
7941 | unsigned int rd = bits (insn, 8, 10); | |
7942 | unsigned int imm8 = bits (insn, 0, 7); | |
7943 | ||
7944 | if (debug_displaced) | |
7945 | fprintf_unfiltered (gdb_stdlog, | |
7946 | "displaced: copying thumb adr r%d, #%d insn %.4x\n", | |
7947 | rd, imm8, insn); | |
7948 | ||
7949 | return thumb_copy_pc_relative_16bit (gdbarch, regs, dsc, rd, imm8); | |
7950 | } | |
7951 | ||
7952 | static int | |
7953 | thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1, | |
7954 | uint16_t insn2, struct regcache *regs, | |
7955 | struct displaced_step_closure *dsc) | |
7956 | { | |
7957 | unsigned int rd = bits (insn2, 8, 11); | |
7958 | /* Since immediate has the same encoding in ADR ADD and SUB, so we simply | |
7959 | extract raw immediate encoding rather than computing immediate. When | |
7960 | generating ADD or SUB instruction, we can simply perform OR operation to | |
7961 | set immediate into ADD. */ | |
7962 | unsigned int imm_3_8 = insn2 & 0x70ff; | |
7963 | unsigned int imm_i = insn1 & 0x0400; /* Clear all bits except bit 10. */ | |
7964 | ||
7965 | if (debug_displaced) | |
7966 | fprintf_unfiltered (gdb_stdlog, | |
7967 | "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n", | |
7968 | rd, imm_i, imm_3_8, insn1, insn2); | |
7969 | ||
7970 | if (bit (insn1, 7)) /* Encoding T2 */ | |
7971 | { | |
7972 | /* Encoding T3: SUB Rd, Rd, #imm */ | |
7973 | dsc->modinsn[0] = (0xf1a0 | rd | imm_i); | |
7974 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
7975 | } | |
7976 | else /* Encoding T3 */ | |
7977 | { | |
7978 | /* Encoding T3: ADD Rd, Rd, #imm */ | |
7979 | dsc->modinsn[0] = (0xf100 | rd | imm_i); | |
7980 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); | |
7981 | } | |
7982 | dsc->numinsns = 2; | |
7983 | ||
7984 | install_pc_relative (gdbarch, regs, dsc, rd); | |
7985 | ||
7986 | return 0; | |
7987 | } | |
7988 | ||
7989 | static int | |
7990 | thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, unsigned short insn1, | |
7991 | struct regcache *regs, | |
7992 | struct displaced_step_closure *dsc) | |
7993 | { | |
7994 | unsigned int rt = bits (insn1, 8, 10); | |
7995 | unsigned int pc; | |
7996 | int imm8 = (bits (insn1, 0, 7) << 2); | |
7997 | CORE_ADDR from = dsc->insn_addr; | |
7998 | ||
7999 | /* LDR Rd, #imm8 | |
8000 | ||
8001 | Rwrite as: | |
8002 | ||
8003 | Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8; | |
8004 | ||
8005 | Insn: LDR R0, [R2, R3]; | |
8006 | Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */ | |
8007 | ||
8008 | if (debug_displaced) | |
8009 | fprintf_unfiltered (gdb_stdlog, | |
8010 | "displaced: copying thumb ldr r%d [pc #%d]\n" | |
8011 | , rt, imm8); | |
8012 | ||
8013 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); | |
8014 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
8015 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); | |
8016 | pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); | |
8017 | /* The assembler calculates the required value of the offset from the | |
8018 | Align(PC,4) value of this instruction to the label. */ | |
8019 | pc = pc & 0xfffffffc; | |
8020 | ||
8021 | displaced_write_reg (regs, dsc, 2, pc, CANNOT_WRITE_PC); | |
8022 | displaced_write_reg (regs, dsc, 3, imm8, CANNOT_WRITE_PC); | |
8023 | ||
8024 | dsc->rd = rt; | |
8025 | dsc->u.ldst.xfersize = 4; | |
8026 | dsc->u.ldst.rn = 0; | |
8027 | dsc->u.ldst.immed = 0; | |
8028 | dsc->u.ldst.writeback = 0; | |
8029 | dsc->u.ldst.restore_r4 = 0; | |
8030 | ||
8031 | dsc->modinsn[0] = 0x58d0; /* ldr r0, [r2, r3]*/ | |
8032 | ||
8033 | dsc->cleanup = &cleanup_load; | |
8034 | ||
8035 | return 0; | |
8036 | } | |
8037 | ||
8038 | /* Copy Thumb cbnz/cbz insruction. */ | |
8039 | ||
8040 | static int | |
8041 | thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1, | |
8042 | struct regcache *regs, | |
8043 | struct displaced_step_closure *dsc) | |
8044 | { | |
8045 | int non_zero = bit (insn1, 11); | |
8046 | unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1); | |
8047 | CORE_ADDR from = dsc->insn_addr; | |
8048 | int rn = bits (insn1, 0, 2); | |
8049 | int rn_val = displaced_read_reg (regs, dsc, rn); | |
8050 | ||
8051 | dsc->u.branch.cond = (rn_val && non_zero) || (!rn_val && !non_zero); | |
8052 | /* CBNZ and CBZ do not affect the condition flags. If condition is true, | |
8053 | set it INST_AL, so cleanup_branch will know branch is taken, otherwise, | |
8054 | condition is false, let it be, cleanup_branch will do nothing. */ | |
8055 | if (dsc->u.branch.cond) | |
8056 | { | |
8057 | dsc->u.branch.cond = INST_AL; | |
8058 | dsc->u.branch.dest = from + 4 + imm5; | |
8059 | } | |
8060 | else | |
8061 | dsc->u.branch.dest = from + 2; | |
8062 | ||
8063 | dsc->u.branch.link = 0; | |
8064 | dsc->u.branch.exchange = 0; | |
8065 | ||
8066 | if (debug_displaced) | |
8067 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s [r%d = 0x%x]" | |
8068 | " insn %.4x to %.8lx\n", non_zero ? "cbnz" : "cbz", | |
8069 | rn, rn_val, insn1, dsc->u.branch.dest); | |
8070 | ||
8071 | dsc->modinsn[0] = THUMB_NOP; | |
8072 | ||
8073 | dsc->cleanup = &cleanup_branch; | |
8074 | return 0; | |
8075 | } | |
8076 | ||
8077 | /* Copy Table Branch Byte/Halfword */ | |
8078 | static int | |
8079 | thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1, | |
8080 | uint16_t insn2, struct regcache *regs, | |
8081 | struct displaced_step_closure *dsc) | |
8082 | { | |
8083 | ULONGEST rn_val, rm_val; | |
8084 | int is_tbh = bit (insn2, 4); | |
8085 | CORE_ADDR halfwords = 0; | |
8086 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8087 | ||
8088 | rn_val = displaced_read_reg (regs, dsc, bits (insn1, 0, 3)); | |
8089 | rm_val = displaced_read_reg (regs, dsc, bits (insn2, 0, 3)); | |
8090 | ||
8091 | if (is_tbh) | |
8092 | { | |
8093 | gdb_byte buf[2]; | |
8094 | ||
8095 | target_read_memory (rn_val + 2 * rm_val, buf, 2); | |
8096 | halfwords = extract_unsigned_integer (buf, 2, byte_order); | |
8097 | } | |
8098 | else | |
8099 | { | |
8100 | gdb_byte buf[1]; | |
8101 | ||
8102 | target_read_memory (rn_val + rm_val, buf, 1); | |
8103 | halfwords = extract_unsigned_integer (buf, 1, byte_order); | |
8104 | } | |
8105 | ||
8106 | if (debug_displaced) | |
8107 | fprintf_unfiltered (gdb_stdlog, "displaced: %s base 0x%x offset 0x%x" | |
8108 | " offset 0x%x\n", is_tbh ? "tbh" : "tbb", | |
8109 | (unsigned int) rn_val, (unsigned int) rm_val, | |
8110 | (unsigned int) halfwords); | |
8111 | ||
8112 | dsc->u.branch.cond = INST_AL; | |
8113 | dsc->u.branch.link = 0; | |
8114 | dsc->u.branch.exchange = 0; | |
8115 | dsc->u.branch.dest = dsc->insn_addr + 4 + 2 * halfwords; | |
8116 | ||
8117 | dsc->cleanup = &cleanup_branch; | |
8118 | ||
8119 | return 0; | |
8120 | } | |
8121 | ||
8122 | static void | |
8123 | cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs, | |
8124 | struct displaced_step_closure *dsc) | |
8125 | { | |
8126 | /* PC <- r7 */ | |
8127 | int val = displaced_read_reg (regs, dsc, 7); | |
8128 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, val, BX_WRITE_PC); | |
8129 | ||
8130 | /* r7 <- r8 */ | |
8131 | val = displaced_read_reg (regs, dsc, 8); | |
8132 | displaced_write_reg (regs, dsc, 7, val, CANNOT_WRITE_PC); | |
8133 | ||
8134 | /* r8 <- tmp[0] */ | |
8135 | displaced_write_reg (regs, dsc, 8, dsc->tmp[0], CANNOT_WRITE_PC); | |
8136 | ||
8137 | } | |
8138 | ||
8139 | static int | |
8140 | thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, unsigned short insn1, | |
8141 | struct regcache *regs, | |
8142 | struct displaced_step_closure *dsc) | |
8143 | { | |
8144 | dsc->u.block.regmask = insn1 & 0x00ff; | |
8145 | ||
8146 | /* Rewrite instruction: POP {rX, rY, ...,rZ, PC} | |
8147 | to : | |
8148 | ||
8149 | (1) register list is full, that is, r0-r7 are used. | |
8150 | Prepare: tmp[0] <- r8 | |
8151 | ||
8152 | POP {r0, r1, ...., r6, r7}; remove PC from reglist | |
8153 | MOV r8, r7; Move value of r7 to r8; | |
8154 | POP {r7}; Store PC value into r7. | |
8155 | ||
8156 | Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0] | |
8157 | ||
8158 | (2) register list is not full, supposing there are N registers in | |
8159 | register list (except PC, 0 <= N <= 7). | |
8160 | Prepare: for each i, 0 - N, tmp[i] <- ri. | |
8161 | ||
8162 | POP {r0, r1, ...., rN}; | |
8163 | ||
8164 | Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN | |
8165 | from tmp[] properly. | |
8166 | */ | |
8167 | if (debug_displaced) | |
8168 | fprintf_unfiltered (gdb_stdlog, | |
8169 | "displaced: copying thumb pop {%.8x, pc} insn %.4x\n", | |
8170 | dsc->u.block.regmask, insn1); | |
8171 | ||
8172 | if (dsc->u.block.regmask == 0xff) | |
8173 | { | |
8174 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 8); | |
8175 | ||
8176 | dsc->modinsn[0] = (insn1 & 0xfeff); /* POP {r0,r1,...,r6, r7} */ | |
8177 | dsc->modinsn[1] = 0x46b8; /* MOV r8, r7 */ | |
8178 | dsc->modinsn[2] = 0xbc80; /* POP {r7} */ | |
8179 | ||
8180 | dsc->numinsns = 3; | |
8181 | dsc->cleanup = &cleanup_pop_pc_16bit_all; | |
8182 | } | |
8183 | else | |
8184 | { | |
8185 | unsigned int num_in_list = bitcount (dsc->u.block.regmask); | |
8186 | unsigned int new_regmask, bit = 1; | |
8187 | unsigned int to = 0, from = 0, i, new_rn; | |
8188 | ||
8189 | for (i = 0; i < num_in_list + 1; i++) | |
8190 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); | |
8191 | ||
8192 | new_regmask = (1 << (num_in_list + 1)) - 1; | |
8193 | ||
8194 | if (debug_displaced) | |
8195 | fprintf_unfiltered (gdb_stdlog, _("displaced: POP " | |
8196 | "{..., pc}: original reg list %.4x," | |
8197 | " modified list %.4x\n"), | |
8198 | (int) dsc->u.block.regmask, new_regmask); | |
8199 | ||
8200 | dsc->u.block.regmask |= 0x8000; | |
8201 | dsc->u.block.writeback = 0; | |
8202 | dsc->u.block.cond = INST_AL; | |
8203 | ||
8204 | dsc->modinsn[0] = (insn1 & ~0x1ff) | (new_regmask & 0xff); | |
8205 | ||
8206 | dsc->cleanup = &cleanup_block_load_pc; | |
8207 | } | |
8208 | ||
8209 | return 0; | |
8210 | } | |
8211 | ||
8212 | static void | |
8213 | thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
8214 | struct regcache *regs, | |
8215 | struct displaced_step_closure *dsc) | |
8216 | { | |
8217 | unsigned short op_bit_12_15 = bits (insn1, 12, 15); | |
8218 | unsigned short op_bit_10_11 = bits (insn1, 10, 11); | |
8219 | int err = 0; | |
8220 | ||
8221 | /* 16-bit thumb instructions. */ | |
8222 | switch (op_bit_12_15) | |
8223 | { | |
8224 | /* Shift (imme), add, subtract, move and compare. */ | |
8225 | case 0: case 1: case 2: case 3: | |
8226 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
8227 | "shift/add/sub/mov/cmp", | |
8228 | dsc); | |
8229 | break; | |
8230 | case 4: | |
8231 | switch (op_bit_10_11) | |
8232 | { | |
8233 | case 0: /* Data-processing */ | |
8234 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, | |
8235 | "data-processing", | |
8236 | dsc); | |
8237 | break; | |
8238 | case 1: /* Special data instructions and branch and exchange. */ | |
8239 | { | |
8240 | unsigned short op = bits (insn1, 7, 9); | |
8241 | if (op == 6 || op == 7) /* BX or BLX */ | |
8242 | err = thumb_copy_bx_blx_reg (gdbarch, insn1, regs, dsc); | |
8243 | else if (bits (insn1, 6, 7) != 0) /* ADD/MOV/CMP high registers. */ | |
8244 | err = thumb_copy_alu_reg (gdbarch, insn1, regs, dsc); | |
8245 | else | |
8246 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "special data", | |
8247 | dsc); | |
8248 | } | |
8249 | break; | |
8250 | default: /* LDR (literal) */ | |
8251 | err = thumb_copy_16bit_ldr_literal (gdbarch, insn1, regs, dsc); | |
8252 | } | |
8253 | break; | |
8254 | case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */ | |
8255 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldr/str", dsc); | |
8256 | break; | |
8257 | case 10: | |
8258 | if (op_bit_10_11 < 2) /* Generate PC-relative address */ | |
8259 | err = thumb_decode_pc_relative_16bit (gdbarch, insn1, regs, dsc); | |
8260 | else /* Generate SP-relative address */ | |
8261 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "sp-relative", dsc); | |
8262 | break; | |
8263 | case 11: /* Misc 16-bit instructions */ | |
8264 | { | |
8265 | switch (bits (insn1, 8, 11)) | |
8266 | { | |
8267 | case 1: case 3: case 9: case 11: /* CBNZ, CBZ */ | |
8268 | err = thumb_copy_cbnz_cbz (gdbarch, insn1, regs, dsc); | |
8269 | break; | |
8270 | case 12: case 13: /* POP */ | |
8271 | if (bit (insn1, 8)) /* PC is in register list. */ | |
8272 | err = thumb_copy_pop_pc_16bit (gdbarch, insn1, regs, dsc); | |
8273 | else | |
8274 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "pop", dsc); | |
8275 | break; | |
8276 | case 15: /* If-Then, and hints */ | |
8277 | if (bits (insn1, 0, 3)) | |
8278 | /* If-Then makes up to four following instructions conditional. | |
8279 | IT instruction itself is not conditional, so handle it as a | |
8280 | common unmodified instruction. */ | |
8281 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "If-Then", | |
8282 | dsc); | |
8283 | else | |
8284 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "hints", dsc); | |
8285 | break; | |
8286 | default: | |
8287 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "misc", dsc); | |
8288 | } | |
8289 | } | |
8290 | break; | |
8291 | case 12: | |
8292 | if (op_bit_10_11 < 2) /* Store multiple registers */ | |
8293 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "stm", dsc); | |
8294 | else /* Load multiple registers */ | |
8295 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldm", dsc); | |
8296 | break; | |
8297 | case 13: /* Conditional branch and supervisor call */ | |
8298 | if (bits (insn1, 9, 11) != 7) /* conditional branch */ | |
8299 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
8300 | else | |
8301 | err = thumb_copy_svc (gdbarch, insn1, regs, dsc); | |
8302 | break; | |
8303 | case 14: /* Unconditional branch */ | |
8304 | err = thumb_copy_b (gdbarch, insn1, dsc); | |
8305 | break; | |
8306 | default: | |
8307 | err = 1; | |
8308 | } | |
8309 | ||
8310 | if (err) | |
8311 | internal_error (__FILE__, __LINE__, | |
8312 | _("thumb_process_displaced_16bit_insn: Instruction decode error")); | |
8313 | } | |
8314 | ||
8315 | static int | |
8316 | decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch, | |
8317 | uint16_t insn1, uint16_t insn2, | |
8318 | struct regcache *regs, | |
8319 | struct displaced_step_closure *dsc) | |
8320 | { | |
8321 | int rt = bits (insn2, 12, 15); | |
8322 | int rn = bits (insn1, 0, 3); | |
8323 | int op1 = bits (insn1, 7, 8); | |
8324 | int err = 0; | |
8325 | ||
8326 | switch (bits (insn1, 5, 6)) | |
8327 | { | |
8328 | case 0: /* Load byte and memory hints */ | |
8329 | if (rt == 0xf) /* PLD/PLI */ | |
8330 | { | |
8331 | if (rn == 0xf) | |
8332 | /* PLD literal or Encoding T3 of PLI(immediate, literal). */ | |
8333 | return thumb2_copy_preload (gdbarch, insn1, insn2, regs, dsc); | |
8334 | else | |
8335 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8336 | "pli/pld", dsc); | |
8337 | } | |
8338 | else | |
8339 | { | |
8340 | if (rn == 0xf) /* LDRB/LDRSB (literal) */ | |
8341 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
8342 | 1); | |
8343 | else | |
8344 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8345 | "ldrb{reg, immediate}/ldrbt", | |
8346 | dsc); | |
8347 | } | |
8348 | ||
8349 | break; | |
8350 | case 1: /* Load halfword and memory hints. */ | |
8351 | if (rt == 0xf) /* PLD{W} and Unalloc memory hint. */ | |
8352 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8353 | "pld/unalloc memhint", dsc); | |
8354 | else | |
8355 | { | |
8356 | if (rn == 0xf) | |
8357 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, | |
8358 | 2); | |
8359 | else | |
8360 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8361 | "ldrh/ldrht", dsc); | |
8362 | } | |
8363 | break; | |
8364 | case 2: /* Load word */ | |
8365 | { | |
8366 | int insn2_bit_8_11 = bits (insn2, 8, 11); | |
8367 | ||
8368 | if (rn == 0xf) | |
8369 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, 4); | |
8370 | else if (op1 == 0x1) /* Encoding T3 */ | |
8371 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, dsc, | |
8372 | 0, 1); | |
8373 | else /* op1 == 0x0 */ | |
8374 | { | |
8375 | if (insn2_bit_8_11 == 0xc || (insn2_bit_8_11 & 0x9) == 0x9) | |
8376 | /* LDR (immediate) */ | |
8377 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
8378 | dsc, bit (insn2, 8), 1); | |
8379 | else if (insn2_bit_8_11 == 0xe) /* LDRT */ | |
8380 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8381 | "ldrt", dsc); | |
8382 | else | |
8383 | /* LDR (register) */ | |
8384 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, | |
8385 | dsc, 0, 0); | |
8386 | } | |
8387 | break; | |
8388 | } | |
8389 | default: | |
8390 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); | |
8391 | break; | |
8392 | } | |
8393 | return 0; | |
8394 | } | |
8395 | ||
8396 | static void | |
8397 | thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1, | |
8398 | uint16_t insn2, struct regcache *regs, | |
8399 | struct displaced_step_closure *dsc) | |
8400 | { | |
8401 | int err = 0; | |
8402 | unsigned short op = bit (insn2, 15); | |
8403 | unsigned int op1 = bits (insn1, 11, 12); | |
8404 | ||
8405 | switch (op1) | |
8406 | { | |
8407 | case 1: | |
8408 | { | |
8409 | switch (bits (insn1, 9, 10)) | |
8410 | { | |
8411 | case 0: | |
8412 | if (bit (insn1, 6)) | |
8413 | { | |
8414 | /* Load/store {dual, execlusive}, table branch. */ | |
8415 | if (bits (insn1, 7, 8) == 1 && bits (insn1, 4, 5) == 1 | |
8416 | && bits (insn2, 5, 7) == 0) | |
8417 | err = thumb2_copy_table_branch (gdbarch, insn1, insn2, regs, | |
8418 | dsc); | |
8419 | else | |
8420 | /* PC is not allowed to use in load/store {dual, exclusive} | |
8421 | instructions. */ | |
8422 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8423 | "load/store dual/ex", dsc); | |
8424 | } | |
8425 | else /* load/store multiple */ | |
8426 | { | |
8427 | switch (bits (insn1, 7, 8)) | |
8428 | { | |
8429 | case 0: case 3: /* SRS, RFE */ | |
8430 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8431 | "srs/rfe", dsc); | |
8432 | break; | |
8433 | case 1: case 2: /* LDM/STM/PUSH/POP */ | |
8434 | err = thumb2_copy_block_xfer (gdbarch, insn1, insn2, regs, dsc); | |
8435 | break; | |
8436 | } | |
8437 | } | |
8438 | break; | |
8439 | ||
8440 | case 1: | |
8441 | /* Data-processing (shift register). */ | |
8442 | err = thumb2_decode_dp_shift_reg (gdbarch, insn1, insn2, regs, | |
8443 | dsc); | |
8444 | break; | |
8445 | default: /* Coprocessor instructions. */ | |
8446 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
8447 | break; | |
8448 | } | |
8449 | break; | |
8450 | } | |
8451 | case 2: /* op1 = 2 */ | |
8452 | if (op) /* Branch and misc control. */ | |
8453 | { | |
8454 | if (bit (insn2, 14) /* BLX/BL */ | |
8455 | || bit (insn2, 12) /* Unconditional branch */ | |
8456 | || (bits (insn1, 7, 9) != 0x7)) /* Conditional branch */ | |
8457 | err = thumb2_copy_b_bl_blx (gdbarch, insn1, insn2, regs, dsc); | |
8458 | else | |
8459 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8460 | "misc ctrl", dsc); | |
8461 | } | |
8462 | else | |
8463 | { | |
8464 | if (bit (insn1, 9)) /* Data processing (plain binary imm). */ | |
8465 | { | |
8466 | int op = bits (insn1, 4, 8); | |
8467 | int rn = bits (insn1, 0, 3); | |
8468 | if ((op == 0 || op == 0xa) && rn == 0xf) | |
8469 | err = thumb_copy_pc_relative_32bit (gdbarch, insn1, insn2, | |
8470 | regs, dsc); | |
8471 | else | |
8472 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8473 | "dp/pb", dsc); | |
8474 | } | |
8475 | else /* Data processing (modified immeidate) */ | |
8476 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8477 | "dp/mi", dsc); | |
8478 | } | |
8479 | break; | |
8480 | case 3: /* op1 = 3 */ | |
8481 | switch (bits (insn1, 9, 10)) | |
8482 | { | |
8483 | case 0: | |
8484 | if (bit (insn1, 4)) | |
8485 | err = decode_thumb_32bit_ld_mem_hints (gdbarch, insn1, insn2, | |
8486 | regs, dsc); | |
8487 | else /* NEON Load/Store and Store single data item */ | |
8488 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8489 | "neon elt/struct load/store", | |
8490 | dsc); | |
8491 | break; | |
8492 | case 1: /* op1 = 3, bits (9, 10) == 1 */ | |
8493 | switch (bits (insn1, 7, 8)) | |
8494 | { | |
8495 | case 0: case 1: /* Data processing (register) */ | |
8496 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8497 | "dp(reg)", dsc); | |
8498 | break; | |
8499 | case 2: /* Multiply and absolute difference */ | |
8500 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8501 | "mul/mua/diff", dsc); | |
8502 | break; | |
8503 | case 3: /* Long multiply and divide */ | |
8504 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, | |
8505 | "lmul/lmua", dsc); | |
8506 | break; | |
8507 | } | |
8508 | break; | |
8509 | default: /* Coprocessor instructions */ | |
8510 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); | |
8511 | break; | |
8512 | } | |
8513 | break; | |
8514 | default: | |
8515 | err = 1; | |
8516 | } | |
8517 | ||
8518 | if (err) | |
8519 | internal_error (__FILE__, __LINE__, | |
8520 | _("thumb_process_displaced_32bit_insn: Instruction decode error")); | |
8521 | ||
8522 | } | |
8523 | ||
b434a28f YQ |
8524 | static void |
8525 | thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, | |
8526 | CORE_ADDR to, struct regcache *regs, | |
8527 | struct displaced_step_closure *dsc) | |
8528 | { | |
34518530 YQ |
8529 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
8530 | uint16_t insn1 | |
8531 | = read_memory_unsigned_integer (from, 2, byte_order_for_code); | |
8532 | ||
8533 | if (debug_displaced) | |
8534 | fprintf_unfiltered (gdb_stdlog, "displaced: process thumb insn %.4x " | |
8535 | "at %.8lx\n", insn1, (unsigned long) from); | |
8536 | ||
8537 | dsc->is_thumb = 1; | |
8538 | dsc->insn_size = thumb_insn_size (insn1); | |
8539 | if (thumb_insn_size (insn1) == 4) | |
8540 | { | |
8541 | uint16_t insn2 | |
8542 | = read_memory_unsigned_integer (from + 2, 2, byte_order_for_code); | |
8543 | thumb_process_displaced_32bit_insn (gdbarch, insn1, insn2, regs, dsc); | |
8544 | } | |
8545 | else | |
8546 | thumb_process_displaced_16bit_insn (gdbarch, insn1, regs, dsc); | |
b434a28f YQ |
8547 | } |
8548 | ||
cca44b1b | 8549 | void |
b434a28f YQ |
8550 | arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
8551 | CORE_ADDR to, struct regcache *regs, | |
cca44b1b JB |
8552 | struct displaced_step_closure *dsc) |
8553 | { | |
8554 | int err = 0; | |
b434a28f YQ |
8555 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
8556 | uint32_t insn; | |
cca44b1b JB |
8557 | |
8558 | /* Most displaced instructions use a 1-instruction scratch space, so set this | |
8559 | here and override below if/when necessary. */ | |
8560 | dsc->numinsns = 1; | |
8561 | dsc->insn_addr = from; | |
8562 | dsc->scratch_base = to; | |
8563 | dsc->cleanup = NULL; | |
8564 | dsc->wrote_to_pc = 0; | |
8565 | ||
b434a28f YQ |
8566 | if (!displaced_in_arm_mode (regs)) |
8567 | return thumb_process_displaced_insn (gdbarch, from, to, regs, dsc); | |
8568 | ||
4db71c0b YQ |
8569 | dsc->is_thumb = 0; |
8570 | dsc->insn_size = 4; | |
b434a28f YQ |
8571 | insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); |
8572 | if (debug_displaced) | |
8573 | fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx " | |
8574 | "at %.8lx\n", (unsigned long) insn, | |
8575 | (unsigned long) from); | |
8576 | ||
cca44b1b | 8577 | if ((insn & 0xf0000000) == 0xf0000000) |
7ff120b4 | 8578 | err = arm_decode_unconditional (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8579 | else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24)) |
8580 | { | |
8581 | case 0x0: case 0x1: case 0x2: case 0x3: | |
7ff120b4 | 8582 | err = arm_decode_dp_misc (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8583 | break; |
8584 | ||
8585 | case 0x4: case 0x5: case 0x6: | |
7ff120b4 | 8586 | err = arm_decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8587 | break; |
8588 | ||
8589 | case 0x7: | |
7ff120b4 | 8590 | err = arm_decode_media (gdbarch, insn, dsc); |
cca44b1b JB |
8591 | break; |
8592 | ||
8593 | case 0x8: case 0x9: case 0xa: case 0xb: | |
7ff120b4 | 8594 | err = arm_decode_b_bl_ldmstm (gdbarch, insn, regs, dsc); |
cca44b1b JB |
8595 | break; |
8596 | ||
8597 | case 0xc: case 0xd: case 0xe: case 0xf: | |
7ff120b4 | 8598 | err = arm_decode_svc_copro (gdbarch, insn, to, regs, dsc); |
cca44b1b JB |
8599 | break; |
8600 | } | |
8601 | ||
8602 | if (err) | |
8603 | internal_error (__FILE__, __LINE__, | |
8604 | _("arm_process_displaced_insn: Instruction decode error")); | |
8605 | } | |
8606 | ||
8607 | /* Actually set up the scratch space for a displaced instruction. */ | |
8608 | ||
8609 | void | |
8610 | arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from, | |
8611 | CORE_ADDR to, struct displaced_step_closure *dsc) | |
8612 | { | |
8613 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4db71c0b | 8614 | unsigned int i, len, offset; |
cca44b1b | 8615 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
4db71c0b YQ |
8616 | int size = dsc->is_thumb? 2 : 4; |
8617 | const unsigned char *bkp_insn; | |
cca44b1b | 8618 | |
4db71c0b | 8619 | offset = 0; |
cca44b1b JB |
8620 | /* Poke modified instruction(s). */ |
8621 | for (i = 0; i < dsc->numinsns; i++) | |
8622 | { | |
8623 | if (debug_displaced) | |
4db71c0b YQ |
8624 | { |
8625 | fprintf_unfiltered (gdb_stdlog, "displaced: writing insn "); | |
8626 | if (size == 4) | |
8627 | fprintf_unfiltered (gdb_stdlog, "%.8lx", | |
8628 | dsc->modinsn[i]); | |
8629 | else if (size == 2) | |
8630 | fprintf_unfiltered (gdb_stdlog, "%.4x", | |
8631 | (unsigned short)dsc->modinsn[i]); | |
8632 | ||
8633 | fprintf_unfiltered (gdb_stdlog, " at %.8lx\n", | |
8634 | (unsigned long) to + offset); | |
8635 | ||
8636 | } | |
8637 | write_memory_unsigned_integer (to + offset, size, | |
8638 | byte_order_for_code, | |
cca44b1b | 8639 | dsc->modinsn[i]); |
4db71c0b YQ |
8640 | offset += size; |
8641 | } | |
8642 | ||
8643 | /* Choose the correct breakpoint instruction. */ | |
8644 | if (dsc->is_thumb) | |
8645 | { | |
8646 | bkp_insn = tdep->thumb_breakpoint; | |
8647 | len = tdep->thumb_breakpoint_size; | |
8648 | } | |
8649 | else | |
8650 | { | |
8651 | bkp_insn = tdep->arm_breakpoint; | |
8652 | len = tdep->arm_breakpoint_size; | |
cca44b1b JB |
8653 | } |
8654 | ||
8655 | /* Put breakpoint afterwards. */ | |
4db71c0b | 8656 | write_memory (to + offset, bkp_insn, len); |
cca44b1b JB |
8657 | |
8658 | if (debug_displaced) | |
8659 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", | |
8660 | paddress (gdbarch, from), paddress (gdbarch, to)); | |
8661 | } | |
8662 | ||
8663 | /* Entry point for copying an instruction into scratch space for displaced | |
8664 | stepping. */ | |
8665 | ||
8666 | struct displaced_step_closure * | |
8667 | arm_displaced_step_copy_insn (struct gdbarch *gdbarch, | |
8668 | CORE_ADDR from, CORE_ADDR to, | |
8669 | struct regcache *regs) | |
8670 | { | |
8671 | struct displaced_step_closure *dsc | |
8672 | = xmalloc (sizeof (struct displaced_step_closure)); | |
b434a28f | 8673 | arm_process_displaced_insn (gdbarch, from, to, regs, dsc); |
cca44b1b JB |
8674 | arm_displaced_init_closure (gdbarch, from, to, dsc); |
8675 | ||
8676 | return dsc; | |
8677 | } | |
8678 | ||
8679 | /* Entry point for cleaning things up after a displaced instruction has been | |
8680 | single-stepped. */ | |
8681 | ||
8682 | void | |
8683 | arm_displaced_step_fixup (struct gdbarch *gdbarch, | |
8684 | struct displaced_step_closure *dsc, | |
8685 | CORE_ADDR from, CORE_ADDR to, | |
8686 | struct regcache *regs) | |
8687 | { | |
8688 | if (dsc->cleanup) | |
8689 | dsc->cleanup (gdbarch, regs, dsc); | |
8690 | ||
8691 | if (!dsc->wrote_to_pc) | |
4db71c0b YQ |
8692 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
8693 | dsc->insn_addr + dsc->insn_size); | |
8694 | ||
cca44b1b JB |
8695 | } |
8696 | ||
8697 | #include "bfd-in2.h" | |
8698 | #include "libcoff.h" | |
8699 | ||
8700 | static int | |
8701 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) | |
8702 | { | |
9779414d DJ |
8703 | struct gdbarch *gdbarch = info->application_data; |
8704 | ||
8705 | if (arm_pc_is_thumb (gdbarch, memaddr)) | |
cca44b1b JB |
8706 | { |
8707 | static asymbol *asym; | |
8708 | static combined_entry_type ce; | |
8709 | static struct coff_symbol_struct csym; | |
8710 | static struct bfd fake_bfd; | |
8711 | static bfd_target fake_target; | |
8712 | ||
8713 | if (csym.native == NULL) | |
8714 | { | |
8715 | /* Create a fake symbol vector containing a Thumb symbol. | |
8716 | This is solely so that the code in print_insn_little_arm() | |
8717 | and print_insn_big_arm() in opcodes/arm-dis.c will detect | |
8718 | the presence of a Thumb symbol and switch to decoding | |
8719 | Thumb instructions. */ | |
8720 | ||
8721 | fake_target.flavour = bfd_target_coff_flavour; | |
8722 | fake_bfd.xvec = &fake_target; | |
8723 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; | |
8724 | csym.native = &ce; | |
8725 | csym.symbol.the_bfd = &fake_bfd; | |
8726 | csym.symbol.name = "fake"; | |
8727 | asym = (asymbol *) & csym; | |
8728 | } | |
8729 | ||
8730 | memaddr = UNMAKE_THUMB_ADDR (memaddr); | |
8731 | info->symbols = &asym; | |
8732 | } | |
8733 | else | |
8734 | info->symbols = NULL; | |
8735 | ||
8736 | if (info->endian == BFD_ENDIAN_BIG) | |
8737 | return print_insn_big_arm (memaddr, info); | |
8738 | else | |
8739 | return print_insn_little_arm (memaddr, info); | |
8740 | } | |
8741 | ||
8742 | /* The following define instruction sequences that will cause ARM | |
8743 | cpu's to take an undefined instruction trap. These are used to | |
8744 | signal a breakpoint to GDB. | |
8745 | ||
8746 | The newer ARMv4T cpu's are capable of operating in ARM or Thumb | |
8747 | modes. A different instruction is required for each mode. The ARM | |
8748 | cpu's can also be big or little endian. Thus four different | |
8749 | instructions are needed to support all cases. | |
8750 | ||
8751 | Note: ARMv4 defines several new instructions that will take the | |
8752 | undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does | |
8753 | not in fact add the new instructions. The new undefined | |
8754 | instructions in ARMv4 are all instructions that had no defined | |
8755 | behaviour in earlier chips. There is no guarantee that they will | |
8756 | raise an exception, but may be treated as NOP's. In practice, it | |
8757 | may only safe to rely on instructions matching: | |
8758 | ||
8759 | 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
8760 | 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 | |
8761 | 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 | |
8762 | ||
0963b4bd | 8763 | Even this may only true if the condition predicate is true. The |
cca44b1b JB |
8764 | following use a condition predicate of ALWAYS so it is always TRUE. |
8765 | ||
8766 | There are other ways of forcing a breakpoint. GNU/Linux, RISC iX, | |
8767 | and NetBSD all use a software interrupt rather than an undefined | |
8768 | instruction to force a trap. This can be handled by by the | |
8769 | abi-specific code during establishment of the gdbarch vector. */ | |
8770 | ||
8771 | #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7} | |
8772 | #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE} | |
8773 | #define THUMB_LE_BREAKPOINT {0xbe,0xbe} | |
8774 | #define THUMB_BE_BREAKPOINT {0xbe,0xbe} | |
8775 | ||
8776 | static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT; | |
8777 | static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT; | |
8778 | static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT; | |
8779 | static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT; | |
8780 | ||
8781 | /* Determine the type and size of breakpoint to insert at PCPTR. Uses | |
8782 | the program counter value to determine whether a 16-bit or 32-bit | |
8783 | breakpoint should be used. It returns a pointer to a string of | |
8784 | bytes that encode a breakpoint instruction, stores the length of | |
8785 | the string to *lenptr, and adjusts the program counter (if | |
8786 | necessary) to point to the actual memory location where the | |
8787 | breakpoint should be inserted. */ | |
8788 | ||
8789 | static const unsigned char * | |
8790 | arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) | |
8791 | { | |
8792 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
177321bd | 8793 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
cca44b1b | 8794 | |
9779414d | 8795 | if (arm_pc_is_thumb (gdbarch, *pcptr)) |
cca44b1b JB |
8796 | { |
8797 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
177321bd DJ |
8798 | |
8799 | /* If we have a separate 32-bit breakpoint instruction for Thumb-2, | |
8800 | check whether we are replacing a 32-bit instruction. */ | |
8801 | if (tdep->thumb2_breakpoint != NULL) | |
8802 | { | |
8803 | gdb_byte buf[2]; | |
8804 | if (target_read_memory (*pcptr, buf, 2) == 0) | |
8805 | { | |
8806 | unsigned short inst1; | |
8807 | inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
db24da6d | 8808 | if (thumb_insn_size (inst1) == 4) |
177321bd DJ |
8809 | { |
8810 | *lenptr = tdep->thumb2_breakpoint_size; | |
8811 | return tdep->thumb2_breakpoint; | |
8812 | } | |
8813 | } | |
8814 | } | |
8815 | ||
cca44b1b JB |
8816 | *lenptr = tdep->thumb_breakpoint_size; |
8817 | return tdep->thumb_breakpoint; | |
8818 | } | |
8819 | else | |
8820 | { | |
8821 | *lenptr = tdep->arm_breakpoint_size; | |
8822 | return tdep->arm_breakpoint; | |
8823 | } | |
8824 | } | |
8825 | ||
177321bd DJ |
8826 | static void |
8827 | arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, | |
8828 | int *kindptr) | |
8829 | { | |
177321bd DJ |
8830 | arm_breakpoint_from_pc (gdbarch, pcptr, kindptr); |
8831 | ||
9779414d | 8832 | if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4) |
177321bd DJ |
8833 | /* The documented magic value for a 32-bit Thumb-2 breakpoint, so |
8834 | that this is not confused with a 32-bit ARM breakpoint. */ | |
8835 | *kindptr = 3; | |
8836 | } | |
8837 | ||
cca44b1b JB |
8838 | /* Extract from an array REGBUF containing the (raw) register state a |
8839 | function return value of type TYPE, and copy that, in virtual | |
8840 | format, into VALBUF. */ | |
8841 | ||
8842 | static void | |
8843 | arm_extract_return_value (struct type *type, struct regcache *regs, | |
8844 | gdb_byte *valbuf) | |
8845 | { | |
8846 | struct gdbarch *gdbarch = get_regcache_arch (regs); | |
8847 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8848 | ||
8849 | if (TYPE_CODE_FLT == TYPE_CODE (type)) | |
8850 | { | |
8851 | switch (gdbarch_tdep (gdbarch)->fp_model) | |
8852 | { | |
8853 | case ARM_FLOAT_FPA: | |
8854 | { | |
8855 | /* The value is in register F0 in internal format. We need to | |
8856 | extract the raw value and then convert it to the desired | |
8857 | internal type. */ | |
8858 | bfd_byte tmpbuf[FP_REGISTER_SIZE]; | |
8859 | ||
8860 | regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf); | |
8861 | convert_from_extended (floatformat_from_type (type), tmpbuf, | |
8862 | valbuf, gdbarch_byte_order (gdbarch)); | |
8863 | } | |
8864 | break; | |
8865 | ||
8866 | case ARM_FLOAT_SOFT_FPA: | |
8867 | case ARM_FLOAT_SOFT_VFP: | |
8868 | /* ARM_FLOAT_VFP can arise if this is a variadic function so | |
8869 | not using the VFP ABI code. */ | |
8870 | case ARM_FLOAT_VFP: | |
8871 | regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf); | |
8872 | if (TYPE_LENGTH (type) > 4) | |
8873 | regcache_cooked_read (regs, ARM_A1_REGNUM + 1, | |
8874 | valbuf + INT_REGISTER_SIZE); | |
8875 | break; | |
8876 | ||
8877 | default: | |
0963b4bd MS |
8878 | internal_error (__FILE__, __LINE__, |
8879 | _("arm_extract_return_value: " | |
8880 | "Floating point model not supported")); | |
cca44b1b JB |
8881 | break; |
8882 | } | |
8883 | } | |
8884 | else if (TYPE_CODE (type) == TYPE_CODE_INT | |
8885 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
8886 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
8887 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
8888 | || TYPE_CODE (type) == TYPE_CODE_REF | |
8889 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
8890 | { | |
b021a221 MS |
8891 | /* If the type is a plain integer, then the access is |
8892 | straight-forward. Otherwise we have to play around a bit | |
8893 | more. */ | |
cca44b1b JB |
8894 | int len = TYPE_LENGTH (type); |
8895 | int regno = ARM_A1_REGNUM; | |
8896 | ULONGEST tmp; | |
8897 | ||
8898 | while (len > 0) | |
8899 | { | |
8900 | /* By using store_unsigned_integer we avoid having to do | |
8901 | anything special for small big-endian values. */ | |
8902 | regcache_cooked_read_unsigned (regs, regno++, &tmp); | |
8903 | store_unsigned_integer (valbuf, | |
8904 | (len > INT_REGISTER_SIZE | |
8905 | ? INT_REGISTER_SIZE : len), | |
8906 | byte_order, tmp); | |
8907 | len -= INT_REGISTER_SIZE; | |
8908 | valbuf += INT_REGISTER_SIZE; | |
8909 | } | |
8910 | } | |
8911 | else | |
8912 | { | |
8913 | /* For a structure or union the behaviour is as if the value had | |
8914 | been stored to word-aligned memory and then loaded into | |
8915 | registers with 32-bit load instruction(s). */ | |
8916 | int len = TYPE_LENGTH (type); | |
8917 | int regno = ARM_A1_REGNUM; | |
8918 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; | |
8919 | ||
8920 | while (len > 0) | |
8921 | { | |
8922 | regcache_cooked_read (regs, regno++, tmpbuf); | |
8923 | memcpy (valbuf, tmpbuf, | |
8924 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); | |
8925 | len -= INT_REGISTER_SIZE; | |
8926 | valbuf += INT_REGISTER_SIZE; | |
8927 | } | |
8928 | } | |
8929 | } | |
8930 | ||
8931 | ||
8932 | /* Will a function return an aggregate type in memory or in a | |
8933 | register? Return 0 if an aggregate type can be returned in a | |
8934 | register, 1 if it must be returned in memory. */ | |
8935 | ||
8936 | static int | |
8937 | arm_return_in_memory (struct gdbarch *gdbarch, struct type *type) | |
8938 | { | |
8939 | int nRc; | |
8940 | enum type_code code; | |
8941 | ||
8942 | CHECK_TYPEDEF (type); | |
8943 | ||
8944 | /* In the ARM ABI, "integer" like aggregate types are returned in | |
8945 | registers. For an aggregate type to be integer like, its size | |
8946 | must be less than or equal to INT_REGISTER_SIZE and the | |
8947 | offset of each addressable subfield must be zero. Note that bit | |
8948 | fields are not addressable, and all addressable subfields of | |
8949 | unions always start at offset zero. | |
8950 | ||
8951 | This function is based on the behaviour of GCC 2.95.1. | |
8952 | See: gcc/arm.c: arm_return_in_memory() for details. | |
8953 | ||
8954 | Note: All versions of GCC before GCC 2.95.2 do not set up the | |
8955 | parameters correctly for a function returning the following | |
8956 | structure: struct { float f;}; This should be returned in memory, | |
8957 | not a register. Richard Earnshaw sent me a patch, but I do not | |
8958 | know of any way to detect if a function like the above has been | |
8959 | compiled with the correct calling convention. */ | |
8960 | ||
8961 | /* All aggregate types that won't fit in a register must be returned | |
8962 | in memory. */ | |
8963 | if (TYPE_LENGTH (type) > INT_REGISTER_SIZE) | |
8964 | { | |
8965 | return 1; | |
8966 | } | |
8967 | ||
8968 | /* The AAPCS says all aggregates not larger than a word are returned | |
8969 | in a register. */ | |
8970 | if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS) | |
8971 | return 0; | |
8972 | ||
8973 | /* The only aggregate types that can be returned in a register are | |
8974 | structs and unions. Arrays must be returned in memory. */ | |
8975 | code = TYPE_CODE (type); | |
8976 | if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code)) | |
8977 | { | |
8978 | return 1; | |
8979 | } | |
8980 | ||
8981 | /* Assume all other aggregate types can be returned in a register. | |
8982 | Run a check for structures, unions and arrays. */ | |
8983 | nRc = 0; | |
8984 | ||
8985 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) | |
8986 | { | |
8987 | int i; | |
8988 | /* Need to check if this struct/union is "integer" like. For | |
8989 | this to be true, its size must be less than or equal to | |
8990 | INT_REGISTER_SIZE and the offset of each addressable | |
8991 | subfield must be zero. Note that bit fields are not | |
8992 | addressable, and unions always start at offset zero. If any | |
8993 | of the subfields is a floating point type, the struct/union | |
8994 | cannot be an integer type. */ | |
8995 | ||
8996 | /* For each field in the object, check: | |
8997 | 1) Is it FP? --> yes, nRc = 1; | |
67255d04 RE |
8998 | 2) Is it addressable (bitpos != 0) and |
8999 | not packed (bitsize == 0)? | |
9000 | --> yes, nRc = 1 | |
9001 | */ | |
9002 | ||
9003 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
9004 | { | |
9005 | enum type_code field_type_code; | |
0963b4bd MS |
9006 | field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, |
9007 | i))); | |
67255d04 RE |
9008 | |
9009 | /* Is it a floating point type field? */ | |
9010 | if (field_type_code == TYPE_CODE_FLT) | |
9011 | { | |
9012 | nRc = 1; | |
9013 | break; | |
9014 | } | |
9015 | ||
9016 | /* If bitpos != 0, then we have to care about it. */ | |
9017 | if (TYPE_FIELD_BITPOS (type, i) != 0) | |
9018 | { | |
9019 | /* Bitfields are not addressable. If the field bitsize is | |
9020 | zero, then the field is not packed. Hence it cannot be | |
9021 | a bitfield or any other packed type. */ | |
9022 | if (TYPE_FIELD_BITSIZE (type, i) == 0) | |
9023 | { | |
9024 | nRc = 1; | |
9025 | break; | |
9026 | } | |
9027 | } | |
9028 | } | |
9029 | } | |
9030 | ||
9031 | return nRc; | |
9032 | } | |
9033 | ||
34e8f22d RE |
9034 | /* Write into appropriate registers a function return value of type |
9035 | TYPE, given in virtual format. */ | |
9036 | ||
9037 | static void | |
b508a996 | 9038 | arm_store_return_value (struct type *type, struct regcache *regs, |
5238cf52 | 9039 | const gdb_byte *valbuf) |
34e8f22d | 9040 | { |
be8626e0 | 9041 | struct gdbarch *gdbarch = get_regcache_arch (regs); |
e17a4113 | 9042 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
be8626e0 | 9043 | |
34e8f22d RE |
9044 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
9045 | { | |
7a5ea0d4 | 9046 | char buf[MAX_REGISTER_SIZE]; |
34e8f22d | 9047 | |
be8626e0 | 9048 | switch (gdbarch_tdep (gdbarch)->fp_model) |
08216dd7 RE |
9049 | { |
9050 | case ARM_FLOAT_FPA: | |
9051 | ||
be8626e0 MD |
9052 | convert_to_extended (floatformat_from_type (type), buf, valbuf, |
9053 | gdbarch_byte_order (gdbarch)); | |
b508a996 | 9054 | regcache_cooked_write (regs, ARM_F0_REGNUM, buf); |
08216dd7 RE |
9055 | break; |
9056 | ||
fd50bc42 | 9057 | case ARM_FLOAT_SOFT_FPA: |
08216dd7 | 9058 | case ARM_FLOAT_SOFT_VFP: |
90445bd3 DJ |
9059 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
9060 | not using the VFP ABI code. */ | |
9061 | case ARM_FLOAT_VFP: | |
b508a996 RE |
9062 | regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf); |
9063 | if (TYPE_LENGTH (type) > 4) | |
9064 | regcache_cooked_write (regs, ARM_A1_REGNUM + 1, | |
7a5ea0d4 | 9065 | valbuf + INT_REGISTER_SIZE); |
08216dd7 RE |
9066 | break; |
9067 | ||
9068 | default: | |
9b20d036 MS |
9069 | internal_error (__FILE__, __LINE__, |
9070 | _("arm_store_return_value: Floating " | |
9071 | "point model not supported")); | |
08216dd7 RE |
9072 | break; |
9073 | } | |
34e8f22d | 9074 | } |
b508a996 RE |
9075 | else if (TYPE_CODE (type) == TYPE_CODE_INT |
9076 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
9077 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
9078 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
9079 | || TYPE_CODE (type) == TYPE_CODE_REF | |
9080 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
9081 | { | |
9082 | if (TYPE_LENGTH (type) <= 4) | |
9083 | { | |
9084 | /* Values of one word or less are zero/sign-extended and | |
9085 | returned in r0. */ | |
7a5ea0d4 | 9086 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
9087 | LONGEST val = unpack_long (type, valbuf); |
9088 | ||
e17a4113 | 9089 | store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val); |
b508a996 RE |
9090 | regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf); |
9091 | } | |
9092 | else | |
9093 | { | |
9094 | /* Integral values greater than one word are stored in consecutive | |
9095 | registers starting with r0. This will always be a multiple of | |
9096 | the regiser size. */ | |
9097 | int len = TYPE_LENGTH (type); | |
9098 | int regno = ARM_A1_REGNUM; | |
9099 | ||
9100 | while (len > 0) | |
9101 | { | |
9102 | regcache_cooked_write (regs, regno++, valbuf); | |
7a5ea0d4 DJ |
9103 | len -= INT_REGISTER_SIZE; |
9104 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
9105 | } |
9106 | } | |
9107 | } | |
34e8f22d | 9108 | else |
b508a996 RE |
9109 | { |
9110 | /* For a structure or union the behaviour is as if the value had | |
9111 | been stored to word-aligned memory and then loaded into | |
9112 | registers with 32-bit load instruction(s). */ | |
9113 | int len = TYPE_LENGTH (type); | |
9114 | int regno = ARM_A1_REGNUM; | |
7a5ea0d4 | 9115 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
9116 | |
9117 | while (len > 0) | |
9118 | { | |
9119 | memcpy (tmpbuf, valbuf, | |
7a5ea0d4 | 9120 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); |
b508a996 | 9121 | regcache_cooked_write (regs, regno++, tmpbuf); |
7a5ea0d4 DJ |
9122 | len -= INT_REGISTER_SIZE; |
9123 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
9124 | } |
9125 | } | |
34e8f22d RE |
9126 | } |
9127 | ||
2af48f68 PB |
9128 | |
9129 | /* Handle function return values. */ | |
9130 | ||
9131 | static enum return_value_convention | |
6a3a010b | 9132 | arm_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
9133 | struct type *valtype, struct regcache *regcache, |
9134 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2af48f68 | 9135 | { |
7c00367c | 9136 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
6a3a010b | 9137 | struct type *func_type = function ? value_type (function) : NULL; |
90445bd3 DJ |
9138 | enum arm_vfp_cprc_base_type vfp_base_type; |
9139 | int vfp_base_count; | |
9140 | ||
9141 | if (arm_vfp_abi_for_function (gdbarch, func_type) | |
9142 | && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count)) | |
9143 | { | |
9144 | int reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
9145 | int unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
9146 | int i; | |
9147 | for (i = 0; i < vfp_base_count; i++) | |
9148 | { | |
58d6951d DJ |
9149 | if (reg_char == 'q') |
9150 | { | |
9151 | if (writebuf) | |
9152 | arm_neon_quad_write (gdbarch, regcache, i, | |
9153 | writebuf + i * unit_length); | |
9154 | ||
9155 | if (readbuf) | |
9156 | arm_neon_quad_read (gdbarch, regcache, i, | |
9157 | readbuf + i * unit_length); | |
9158 | } | |
9159 | else | |
9160 | { | |
9161 | char name_buf[4]; | |
9162 | int regnum; | |
9163 | ||
8c042590 | 9164 | xsnprintf (name_buf, sizeof (name_buf), "%c%d", reg_char, i); |
58d6951d DJ |
9165 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9166 | strlen (name_buf)); | |
9167 | if (writebuf) | |
9168 | regcache_cooked_write (regcache, regnum, | |
9169 | writebuf + i * unit_length); | |
9170 | if (readbuf) | |
9171 | regcache_cooked_read (regcache, regnum, | |
9172 | readbuf + i * unit_length); | |
9173 | } | |
90445bd3 DJ |
9174 | } |
9175 | return RETURN_VALUE_REGISTER_CONVENTION; | |
9176 | } | |
7c00367c | 9177 | |
2af48f68 PB |
9178 | if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
9179 | || TYPE_CODE (valtype) == TYPE_CODE_UNION | |
9180 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
9181 | { | |
7c00367c MK |
9182 | if (tdep->struct_return == pcc_struct_return |
9183 | || arm_return_in_memory (gdbarch, valtype)) | |
2af48f68 PB |
9184 | return RETURN_VALUE_STRUCT_CONVENTION; |
9185 | } | |
9186 | ||
7052e42c UW |
9187 | /* AAPCS returns complex types longer than a register in memory. */ |
9188 | if (tdep->arm_abi != ARM_ABI_APCS | |
9189 | && TYPE_CODE (valtype) == TYPE_CODE_COMPLEX | |
9190 | && TYPE_LENGTH (valtype) > INT_REGISTER_SIZE) | |
9191 | return RETURN_VALUE_STRUCT_CONVENTION; | |
9192 | ||
2af48f68 PB |
9193 | if (writebuf) |
9194 | arm_store_return_value (valtype, regcache, writebuf); | |
9195 | ||
9196 | if (readbuf) | |
9197 | arm_extract_return_value (valtype, regcache, readbuf); | |
9198 | ||
9199 | return RETURN_VALUE_REGISTER_CONVENTION; | |
9200 | } | |
9201 | ||
9202 | ||
9df628e0 | 9203 | static int |
60ade65d | 9204 | arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
9df628e0 | 9205 | { |
e17a4113 UW |
9206 | struct gdbarch *gdbarch = get_frame_arch (frame); |
9207 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
9208 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
9df628e0 | 9209 | CORE_ADDR jb_addr; |
7a5ea0d4 | 9210 | char buf[INT_REGISTER_SIZE]; |
9df628e0 | 9211 | |
60ade65d | 9212 | jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM); |
9df628e0 RE |
9213 | |
9214 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, | |
7a5ea0d4 | 9215 | INT_REGISTER_SIZE)) |
9df628e0 RE |
9216 | return 0; |
9217 | ||
e17a4113 | 9218 | *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order); |
9df628e0 RE |
9219 | return 1; |
9220 | } | |
9221 | ||
faa95490 DJ |
9222 | /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, |
9223 | return the target PC. Otherwise return 0. */ | |
c906108c SS |
9224 | |
9225 | CORE_ADDR | |
52f729a7 | 9226 | arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 9227 | { |
2c02bd72 | 9228 | const char *name; |
faa95490 | 9229 | int namelen; |
c906108c SS |
9230 | CORE_ADDR start_addr; |
9231 | ||
9232 | /* Find the starting address and name of the function containing the PC. */ | |
9233 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) | |
9234 | return 0; | |
9235 | ||
faa95490 DJ |
9236 | /* If PC is in a Thumb call or return stub, return the address of the |
9237 | target PC, which is in a register. The thunk functions are called | |
9238 | _call_via_xx, where x is the register name. The possible names | |
3d8d5e79 DJ |
9239 | are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar |
9240 | functions, named __ARM_call_via_r[0-7]. */ | |
9241 | if (strncmp (name, "_call_via_", 10) == 0 | |
9242 | || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0) | |
c906108c | 9243 | { |
ed9a39eb JM |
9244 | /* Use the name suffix to determine which register contains the |
9245 | target PC. */ | |
c5aa993b JM |
9246 | static char *table[15] = |
9247 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
9248 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" | |
9249 | }; | |
c906108c | 9250 | int regno; |
faa95490 | 9251 | int offset = strlen (name) - 2; |
c906108c SS |
9252 | |
9253 | for (regno = 0; regno <= 14; regno++) | |
faa95490 | 9254 | if (strcmp (&name[offset], table[regno]) == 0) |
52f729a7 | 9255 | return get_frame_register_unsigned (frame, regno); |
c906108c | 9256 | } |
ed9a39eb | 9257 | |
faa95490 DJ |
9258 | /* GNU ld generates __foo_from_arm or __foo_from_thumb for |
9259 | non-interworking calls to foo. We could decode the stubs | |
9260 | to find the target but it's easier to use the symbol table. */ | |
9261 | namelen = strlen (name); | |
9262 | if (name[0] == '_' && name[1] == '_' | |
9263 | && ((namelen > 2 + strlen ("_from_thumb") | |
9264 | && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb", | |
9265 | strlen ("_from_thumb")) == 0) | |
9266 | || (namelen > 2 + strlen ("_from_arm") | |
9267 | && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm", | |
9268 | strlen ("_from_arm")) == 0))) | |
9269 | { | |
9270 | char *target_name; | |
9271 | int target_len = namelen - 2; | |
9272 | struct minimal_symbol *minsym; | |
9273 | struct objfile *objfile; | |
9274 | struct obj_section *sec; | |
9275 | ||
9276 | if (name[namelen - 1] == 'b') | |
9277 | target_len -= strlen ("_from_thumb"); | |
9278 | else | |
9279 | target_len -= strlen ("_from_arm"); | |
9280 | ||
9281 | target_name = alloca (target_len + 1); | |
9282 | memcpy (target_name, name + 2, target_len); | |
9283 | target_name[target_len] = '\0'; | |
9284 | ||
9285 | sec = find_pc_section (pc); | |
9286 | objfile = (sec == NULL) ? NULL : sec->objfile; | |
9287 | minsym = lookup_minimal_symbol (target_name, NULL, objfile); | |
9288 | if (minsym != NULL) | |
9289 | return SYMBOL_VALUE_ADDRESS (minsym); | |
9290 | else | |
9291 | return 0; | |
9292 | } | |
9293 | ||
c5aa993b | 9294 | return 0; /* not a stub */ |
c906108c SS |
9295 | } |
9296 | ||
afd7eef0 RE |
9297 | static void |
9298 | set_arm_command (char *args, int from_tty) | |
9299 | { | |
edefbb7c AC |
9300 | printf_unfiltered (_("\ |
9301 | \"set arm\" must be followed by an apporpriate subcommand.\n")); | |
afd7eef0 RE |
9302 | help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout); |
9303 | } | |
9304 | ||
9305 | static void | |
9306 | show_arm_command (char *args, int from_tty) | |
9307 | { | |
26304000 | 9308 | cmd_show_list (showarmcmdlist, from_tty, ""); |
afd7eef0 RE |
9309 | } |
9310 | ||
28e97307 DJ |
9311 | static void |
9312 | arm_update_current_architecture (void) | |
fd50bc42 | 9313 | { |
28e97307 | 9314 | struct gdbarch_info info; |
fd50bc42 | 9315 | |
28e97307 | 9316 | /* If the current architecture is not ARM, we have nothing to do. */ |
f5656ead | 9317 | if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_arm) |
28e97307 | 9318 | return; |
fd50bc42 | 9319 | |
28e97307 DJ |
9320 | /* Update the architecture. */ |
9321 | gdbarch_info_init (&info); | |
fd50bc42 | 9322 | |
28e97307 | 9323 | if (!gdbarch_update_p (info)) |
9b20d036 | 9324 | internal_error (__FILE__, __LINE__, _("could not update architecture")); |
fd50bc42 RE |
9325 | } |
9326 | ||
9327 | static void | |
9328 | set_fp_model_sfunc (char *args, int from_tty, | |
9329 | struct cmd_list_element *c) | |
9330 | { | |
9331 | enum arm_float_model fp_model; | |
9332 | ||
9333 | for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++) | |
9334 | if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0) | |
9335 | { | |
9336 | arm_fp_model = fp_model; | |
9337 | break; | |
9338 | } | |
9339 | ||
9340 | if (fp_model == ARM_FLOAT_LAST) | |
edefbb7c | 9341 | internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."), |
fd50bc42 RE |
9342 | current_fp_model); |
9343 | ||
28e97307 | 9344 | arm_update_current_architecture (); |
fd50bc42 RE |
9345 | } |
9346 | ||
9347 | static void | |
08546159 AC |
9348 | show_fp_model (struct ui_file *file, int from_tty, |
9349 | struct cmd_list_element *c, const char *value) | |
fd50bc42 | 9350 | { |
f5656ead | 9351 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
fd50bc42 | 9352 | |
28e97307 | 9353 | if (arm_fp_model == ARM_FLOAT_AUTO |
f5656ead | 9354 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
9355 | fprintf_filtered (file, _("\ |
9356 | The current ARM floating point model is \"auto\" (currently \"%s\").\n"), | |
9357 | fp_model_strings[tdep->fp_model]); | |
9358 | else | |
9359 | fprintf_filtered (file, _("\ | |
9360 | The current ARM floating point model is \"%s\".\n"), | |
9361 | fp_model_strings[arm_fp_model]); | |
9362 | } | |
9363 | ||
9364 | static void | |
9365 | arm_set_abi (char *args, int from_tty, | |
9366 | struct cmd_list_element *c) | |
9367 | { | |
9368 | enum arm_abi_kind arm_abi; | |
9369 | ||
9370 | for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++) | |
9371 | if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0) | |
9372 | { | |
9373 | arm_abi_global = arm_abi; | |
9374 | break; | |
9375 | } | |
9376 | ||
9377 | if (arm_abi == ARM_ABI_LAST) | |
9378 | internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."), | |
9379 | arm_abi_string); | |
9380 | ||
9381 | arm_update_current_architecture (); | |
9382 | } | |
9383 | ||
9384 | static void | |
9385 | arm_show_abi (struct ui_file *file, int from_tty, | |
9386 | struct cmd_list_element *c, const char *value) | |
9387 | { | |
f5656ead | 9388 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
28e97307 DJ |
9389 | |
9390 | if (arm_abi_global == ARM_ABI_AUTO | |
f5656ead | 9391 | && gdbarch_bfd_arch_info (target_gdbarch ())->arch == bfd_arch_arm) |
28e97307 DJ |
9392 | fprintf_filtered (file, _("\ |
9393 | The current ARM ABI is \"auto\" (currently \"%s\").\n"), | |
9394 | arm_abi_strings[tdep->arm_abi]); | |
9395 | else | |
9396 | fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"), | |
9397 | arm_abi_string); | |
fd50bc42 RE |
9398 | } |
9399 | ||
0428b8f5 DJ |
9400 | static void |
9401 | arm_show_fallback_mode (struct ui_file *file, int from_tty, | |
9402 | struct cmd_list_element *c, const char *value) | |
9403 | { | |
0963b4bd MS |
9404 | fprintf_filtered (file, |
9405 | _("The current execution mode assumed " | |
9406 | "(when symbols are unavailable) is \"%s\".\n"), | |
0428b8f5 DJ |
9407 | arm_fallback_mode_string); |
9408 | } | |
9409 | ||
9410 | static void | |
9411 | arm_show_force_mode (struct ui_file *file, int from_tty, | |
9412 | struct cmd_list_element *c, const char *value) | |
9413 | { | |
f5656ead | 9414 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch ()); |
0428b8f5 | 9415 | |
0963b4bd MS |
9416 | fprintf_filtered (file, |
9417 | _("The current execution mode assumed " | |
9418 | "(even when symbols are available) is \"%s\".\n"), | |
0428b8f5 DJ |
9419 | arm_force_mode_string); |
9420 | } | |
9421 | ||
afd7eef0 RE |
9422 | /* If the user changes the register disassembly style used for info |
9423 | register and other commands, we have to also switch the style used | |
9424 | in opcodes for disassembly output. This function is run in the "set | |
9425 | arm disassembly" command, and does that. */ | |
bc90b915 FN |
9426 | |
9427 | static void | |
afd7eef0 | 9428 | set_disassembly_style_sfunc (char *args, int from_tty, |
bc90b915 FN |
9429 | struct cmd_list_element *c) |
9430 | { | |
afd7eef0 | 9431 | set_disassembly_style (); |
bc90b915 FN |
9432 | } |
9433 | \f | |
966fbf70 | 9434 | /* Return the ARM register name corresponding to register I. */ |
a208b0cb | 9435 | static const char * |
d93859e2 | 9436 | arm_register_name (struct gdbarch *gdbarch, int i) |
966fbf70 | 9437 | { |
58d6951d DJ |
9438 | const int num_regs = gdbarch_num_regs (gdbarch); |
9439 | ||
9440 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
9441 | && i >= num_regs && i < num_regs + 32) | |
9442 | { | |
9443 | static const char *const vfp_pseudo_names[] = { | |
9444 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", | |
9445 | "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", | |
9446 | "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", | |
9447 | "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", | |
9448 | }; | |
9449 | ||
9450 | return vfp_pseudo_names[i - num_regs]; | |
9451 | } | |
9452 | ||
9453 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
9454 | && i >= num_regs + 32 && i < num_regs + 32 + 16) | |
9455 | { | |
9456 | static const char *const neon_pseudo_names[] = { | |
9457 | "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", | |
9458 | "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15", | |
9459 | }; | |
9460 | ||
9461 | return neon_pseudo_names[i - num_regs - 32]; | |
9462 | } | |
9463 | ||
ff6f572f DJ |
9464 | if (i >= ARRAY_SIZE (arm_register_names)) |
9465 | /* These registers are only supported on targets which supply | |
9466 | an XML description. */ | |
9467 | return ""; | |
9468 | ||
966fbf70 RE |
9469 | return arm_register_names[i]; |
9470 | } | |
9471 | ||
bc90b915 | 9472 | static void |
afd7eef0 | 9473 | set_disassembly_style (void) |
bc90b915 | 9474 | { |
123dc839 | 9475 | int current; |
bc90b915 | 9476 | |
123dc839 DJ |
9477 | /* Find the style that the user wants. */ |
9478 | for (current = 0; current < num_disassembly_options; current++) | |
9479 | if (disassembly_style == valid_disassembly_styles[current]) | |
9480 | break; | |
9481 | gdb_assert (current < num_disassembly_options); | |
bc90b915 | 9482 | |
94c30b78 | 9483 | /* Synchronize the disassembler. */ |
bc90b915 FN |
9484 | set_arm_regname_option (current); |
9485 | } | |
9486 | ||
082fc60d RE |
9487 | /* Test whether the coff symbol specific value corresponds to a Thumb |
9488 | function. */ | |
9489 | ||
9490 | static int | |
9491 | coff_sym_is_thumb (int val) | |
9492 | { | |
f8bf5763 PM |
9493 | return (val == C_THUMBEXT |
9494 | || val == C_THUMBSTAT | |
9495 | || val == C_THUMBEXTFUNC | |
9496 | || val == C_THUMBSTATFUNC | |
9497 | || val == C_THUMBLABEL); | |
082fc60d RE |
9498 | } |
9499 | ||
9500 | /* arm_coff_make_msymbol_special() | |
9501 | arm_elf_make_msymbol_special() | |
9502 | ||
9503 | These functions test whether the COFF or ELF symbol corresponds to | |
9504 | an address in thumb code, and set a "special" bit in a minimal | |
9505 | symbol to indicate that it does. */ | |
9506 | ||
34e8f22d | 9507 | static void |
082fc60d RE |
9508 | arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym) |
9509 | { | |
467d42c4 UW |
9510 | if (ARM_SYM_BRANCH_TYPE (&((elf_symbol_type *)sym)->internal_elf_sym) |
9511 | == ST_BRANCH_TO_THUMB) | |
082fc60d RE |
9512 | MSYMBOL_SET_SPECIAL (msym); |
9513 | } | |
9514 | ||
34e8f22d | 9515 | static void |
082fc60d RE |
9516 | arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym) |
9517 | { | |
9518 | if (coff_sym_is_thumb (val)) | |
9519 | MSYMBOL_SET_SPECIAL (msym); | |
9520 | } | |
9521 | ||
60c5725c | 9522 | static void |
c1bd65d0 | 9523 | arm_objfile_data_free (struct objfile *objfile, void *arg) |
60c5725c DJ |
9524 | { |
9525 | struct arm_per_objfile *data = arg; | |
9526 | unsigned int i; | |
9527 | ||
9528 | for (i = 0; i < objfile->obfd->section_count; i++) | |
9529 | VEC_free (arm_mapping_symbol_s, data->section_maps[i]); | |
9530 | } | |
9531 | ||
9532 | static void | |
9533 | arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile, | |
9534 | asymbol *sym) | |
9535 | { | |
9536 | const char *name = bfd_asymbol_name (sym); | |
9537 | struct arm_per_objfile *data; | |
9538 | VEC(arm_mapping_symbol_s) **map_p; | |
9539 | struct arm_mapping_symbol new_map_sym; | |
9540 | ||
9541 | gdb_assert (name[0] == '$'); | |
9542 | if (name[1] != 'a' && name[1] != 't' && name[1] != 'd') | |
9543 | return; | |
9544 | ||
9545 | data = objfile_data (objfile, arm_objfile_data_key); | |
9546 | if (data == NULL) | |
9547 | { | |
9548 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, | |
9549 | struct arm_per_objfile); | |
9550 | set_objfile_data (objfile, arm_objfile_data_key, data); | |
9551 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
9552 | objfile->obfd->section_count, | |
9553 | VEC(arm_mapping_symbol_s) *); | |
9554 | } | |
9555 | map_p = &data->section_maps[bfd_get_section (sym)->index]; | |
9556 | ||
9557 | new_map_sym.value = sym->value; | |
9558 | new_map_sym.type = name[1]; | |
9559 | ||
9560 | /* Assume that most mapping symbols appear in order of increasing | |
9561 | value. If they were randomly distributed, it would be faster to | |
9562 | always push here and then sort at first use. */ | |
9563 | if (!VEC_empty (arm_mapping_symbol_s, *map_p)) | |
9564 | { | |
9565 | struct arm_mapping_symbol *prev_map_sym; | |
9566 | ||
9567 | prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p); | |
9568 | if (prev_map_sym->value >= sym->value) | |
9569 | { | |
9570 | unsigned int idx; | |
9571 | idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym, | |
9572 | arm_compare_mapping_symbols); | |
9573 | VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym); | |
9574 | return; | |
9575 | } | |
9576 | } | |
9577 | ||
9578 | VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym); | |
9579 | } | |
9580 | ||
756fe439 | 9581 | static void |
61a1198a | 9582 | arm_write_pc (struct regcache *regcache, CORE_ADDR pc) |
756fe439 | 9583 | { |
9779414d | 9584 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
61a1198a | 9585 | regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc); |
756fe439 DJ |
9586 | |
9587 | /* If necessary, set the T bit. */ | |
9588 | if (arm_apcs_32) | |
9589 | { | |
9779414d | 9590 | ULONGEST val, t_bit; |
61a1198a | 9591 | regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val); |
9779414d DJ |
9592 | t_bit = arm_psr_thumb_bit (gdbarch); |
9593 | if (arm_pc_is_thumb (gdbarch, pc)) | |
9594 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, | |
9595 | val | t_bit); | |
756fe439 | 9596 | else |
61a1198a | 9597 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
9779414d | 9598 | val & ~t_bit); |
756fe439 DJ |
9599 | } |
9600 | } | |
123dc839 | 9601 | |
58d6951d DJ |
9602 | /* Read the contents of a NEON quad register, by reading from two |
9603 | double registers. This is used to implement the quad pseudo | |
9604 | registers, and for argument passing in case the quad registers are | |
9605 | missing; vectors are passed in quad registers when using the VFP | |
9606 | ABI, even if a NEON unit is not present. REGNUM is the index of | |
9607 | the quad register, in [0, 15]. */ | |
9608 | ||
05d1431c | 9609 | static enum register_status |
58d6951d DJ |
9610 | arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache, |
9611 | int regnum, gdb_byte *buf) | |
9612 | { | |
9613 | char name_buf[4]; | |
9614 | gdb_byte reg_buf[8]; | |
9615 | int offset, double_regnum; | |
05d1431c | 9616 | enum register_status status; |
58d6951d | 9617 | |
8c042590 | 9618 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
9619 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9620 | strlen (name_buf)); | |
9621 | ||
9622 | /* d0 is always the least significant half of q0. */ | |
9623 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9624 | offset = 8; | |
9625 | else | |
9626 | offset = 0; | |
9627 | ||
05d1431c PA |
9628 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
9629 | if (status != REG_VALID) | |
9630 | return status; | |
58d6951d DJ |
9631 | memcpy (buf + offset, reg_buf, 8); |
9632 | ||
9633 | offset = 8 - offset; | |
05d1431c PA |
9634 | status = regcache_raw_read (regcache, double_regnum + 1, reg_buf); |
9635 | if (status != REG_VALID) | |
9636 | return status; | |
58d6951d | 9637 | memcpy (buf + offset, reg_buf, 8); |
05d1431c PA |
9638 | |
9639 | return REG_VALID; | |
58d6951d DJ |
9640 | } |
9641 | ||
05d1431c | 9642 | static enum register_status |
58d6951d DJ |
9643 | arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache, |
9644 | int regnum, gdb_byte *buf) | |
9645 | { | |
9646 | const int num_regs = gdbarch_num_regs (gdbarch); | |
9647 | char name_buf[4]; | |
9648 | gdb_byte reg_buf[8]; | |
9649 | int offset, double_regnum; | |
9650 | ||
9651 | gdb_assert (regnum >= num_regs); | |
9652 | regnum -= num_regs; | |
9653 | ||
9654 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
9655 | /* Quad-precision register. */ | |
05d1431c | 9656 | return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf); |
58d6951d DJ |
9657 | else |
9658 | { | |
05d1431c PA |
9659 | enum register_status status; |
9660 | ||
58d6951d DJ |
9661 | /* Single-precision register. */ |
9662 | gdb_assert (regnum < 32); | |
9663 | ||
9664 | /* s0 is always the least significant half of d0. */ | |
9665 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9666 | offset = (regnum & 1) ? 0 : 4; | |
9667 | else | |
9668 | offset = (regnum & 1) ? 4 : 0; | |
9669 | ||
8c042590 | 9670 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum >> 1); |
58d6951d DJ |
9671 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9672 | strlen (name_buf)); | |
9673 | ||
05d1431c PA |
9674 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
9675 | if (status == REG_VALID) | |
9676 | memcpy (buf, reg_buf + offset, 4); | |
9677 | return status; | |
58d6951d DJ |
9678 | } |
9679 | } | |
9680 | ||
9681 | /* Store the contents of BUF to a NEON quad register, by writing to | |
9682 | two double registers. This is used to implement the quad pseudo | |
9683 | registers, and for argument passing in case the quad registers are | |
9684 | missing; vectors are passed in quad registers when using the VFP | |
9685 | ABI, even if a NEON unit is not present. REGNUM is the index | |
9686 | of the quad register, in [0, 15]. */ | |
9687 | ||
9688 | static void | |
9689 | arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
9690 | int regnum, const gdb_byte *buf) | |
9691 | { | |
9692 | char name_buf[4]; | |
58d6951d DJ |
9693 | int offset, double_regnum; |
9694 | ||
8c042590 | 9695 | xsnprintf (name_buf, sizeof (name_buf), "d%d", regnum << 1); |
58d6951d DJ |
9696 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
9697 | strlen (name_buf)); | |
9698 | ||
9699 | /* d0 is always the least significant half of q0. */ | |
9700 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
9701 | offset = 8; | |
9702 | else | |
9703 | offset = 0; | |
9704 | ||
9705 | regcache_raw_write (regcache, double_regnum, buf + offset); | |
9706 | offset = 8 - offset; | |
9707 | regcache_raw_write (regcache, double_regnum + 1, buf + offset); | |
9708 | } | |
9709 | ||
9710 | static void | |
9711 | arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
9712 | int regnum, const gdb_byte *buf) | |
9713 | { | |
9714 | const int num_regs = gdbarch_num_regs (gdbarch); | |
9715 | char name_buf[4]; | |
9716 | gdb_byte reg_buf[8]; | |
9717 | int offset, double_regnum; | |
9718 | ||
9719 | gdb_assert (regnum >= num_regs); | |
9720 | regnum -= num_regs; | |
9721 | ||
9722 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
9723 | /* Quad-precision register. */ | |
9724 | arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf); | |
9725 | else | |
9726 | { | |
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 | ||
9740 | regcache_raw_read (regcache, double_regnum, reg_buf); | |
9741 | memcpy (reg_buf + offset, buf, 4); | |
9742 | regcache_raw_write (regcache, double_regnum, reg_buf); | |
9743 | } | |
9744 | } | |
9745 | ||
123dc839 DJ |
9746 | static struct value * |
9747 | value_of_arm_user_reg (struct frame_info *frame, const void *baton) | |
9748 | { | |
9749 | const int *reg_p = baton; | |
9750 | return value_of_register (*reg_p, frame); | |
9751 | } | |
97e03143 | 9752 | \f |
70f80edf JT |
9753 | static enum gdb_osabi |
9754 | arm_elf_osabi_sniffer (bfd *abfd) | |
97e03143 | 9755 | { |
2af48f68 | 9756 | unsigned int elfosabi; |
70f80edf | 9757 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
97e03143 | 9758 | |
70f80edf | 9759 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
97e03143 | 9760 | |
28e97307 DJ |
9761 | if (elfosabi == ELFOSABI_ARM) |
9762 | /* GNU tools use this value. Check note sections in this case, | |
9763 | as well. */ | |
9764 | bfd_map_over_sections (abfd, | |
9765 | generic_elf_osabi_sniff_abi_tag_sections, | |
9766 | &osabi); | |
97e03143 | 9767 | |
28e97307 | 9768 | /* Anything else will be handled by the generic ELF sniffer. */ |
70f80edf | 9769 | return osabi; |
97e03143 RE |
9770 | } |
9771 | ||
54483882 YQ |
9772 | static int |
9773 | arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
9774 | struct reggroup *group) | |
9775 | { | |
2c291032 YQ |
9776 | /* FPS register's type is INT, but belongs to float_reggroup. Beside |
9777 | this, FPS register belongs to save_regroup, restore_reggroup, and | |
9778 | all_reggroup, of course. */ | |
54483882 | 9779 | if (regnum == ARM_FPS_REGNUM) |
2c291032 YQ |
9780 | return (group == float_reggroup |
9781 | || group == save_reggroup | |
9782 | || group == restore_reggroup | |
9783 | || group == all_reggroup); | |
54483882 YQ |
9784 | else |
9785 | return default_register_reggroup_p (gdbarch, regnum, group); | |
9786 | } | |
9787 | ||
25f8c692 JL |
9788 | \f |
9789 | /* For backward-compatibility we allow two 'g' packet lengths with | |
9790 | the remote protocol depending on whether FPA registers are | |
9791 | supplied. M-profile targets do not have FPA registers, but some | |
9792 | stubs already exist in the wild which use a 'g' packet which | |
9793 | supplies them albeit with dummy values. The packet format which | |
9794 | includes FPA registers should be considered deprecated for | |
9795 | M-profile targets. */ | |
9796 | ||
9797 | static void | |
9798 | arm_register_g_packet_guesses (struct gdbarch *gdbarch) | |
9799 | { | |
9800 | if (gdbarch_tdep (gdbarch)->is_m) | |
9801 | { | |
9802 | /* If we know from the executable this is an M-profile target, | |
9803 | cater for remote targets whose register set layout is the | |
9804 | same as the FPA layout. */ | |
9805 | register_remote_g_packet_guess (gdbarch, | |
03145bf4 | 9806 | /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */ |
25f8c692 JL |
9807 | (16 * INT_REGISTER_SIZE) |
9808 | + (8 * FP_REGISTER_SIZE) | |
9809 | + (2 * INT_REGISTER_SIZE), | |
9810 | tdesc_arm_with_m_fpa_layout); | |
9811 | ||
9812 | /* The regular M-profile layout. */ | |
9813 | register_remote_g_packet_guess (gdbarch, | |
9814 | /* r0-r12,sp,lr,pc; xpsr */ | |
9815 | (16 * INT_REGISTER_SIZE) | |
9816 | + INT_REGISTER_SIZE, | |
9817 | tdesc_arm_with_m); | |
3184d3f9 JL |
9818 | |
9819 | /* M-profile plus M4F VFP. */ | |
9820 | register_remote_g_packet_guess (gdbarch, | |
9821 | /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */ | |
9822 | (16 * INT_REGISTER_SIZE) | |
9823 | + (16 * VFP_REGISTER_SIZE) | |
9824 | + (2 * INT_REGISTER_SIZE), | |
9825 | tdesc_arm_with_m_vfp_d16); | |
25f8c692 JL |
9826 | } |
9827 | ||
9828 | /* Otherwise we don't have a useful guess. */ | |
9829 | } | |
9830 | ||
70f80edf | 9831 | \f |
da3c6d4a MS |
9832 | /* Initialize the current architecture based on INFO. If possible, |
9833 | re-use an architecture from ARCHES, which is a list of | |
9834 | architectures already created during this debugging session. | |
97e03143 | 9835 | |
da3c6d4a MS |
9836 | Called e.g. at program startup, when reading a core file, and when |
9837 | reading a binary file. */ | |
97e03143 | 9838 | |
39bbf761 RE |
9839 | static struct gdbarch * |
9840 | arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
9841 | { | |
97e03143 | 9842 | struct gdbarch_tdep *tdep; |
39bbf761 | 9843 | struct gdbarch *gdbarch; |
28e97307 DJ |
9844 | struct gdbarch_list *best_arch; |
9845 | enum arm_abi_kind arm_abi = arm_abi_global; | |
9846 | enum arm_float_model fp_model = arm_fp_model; | |
123dc839 | 9847 | struct tdesc_arch_data *tdesc_data = NULL; |
9779414d | 9848 | int i, is_m = 0; |
58d6951d DJ |
9849 | int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0; |
9850 | int have_neon = 0; | |
ff6f572f | 9851 | int have_fpa_registers = 1; |
9779414d DJ |
9852 | const struct target_desc *tdesc = info.target_desc; |
9853 | ||
9854 | /* If we have an object to base this architecture on, try to determine | |
9855 | its ABI. */ | |
9856 | ||
9857 | if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL) | |
9858 | { | |
9859 | int ei_osabi, e_flags; | |
9860 | ||
9861 | switch (bfd_get_flavour (info.abfd)) | |
9862 | { | |
9863 | case bfd_target_aout_flavour: | |
9864 | /* Assume it's an old APCS-style ABI. */ | |
9865 | arm_abi = ARM_ABI_APCS; | |
9866 | break; | |
9867 | ||
9868 | case bfd_target_coff_flavour: | |
9869 | /* Assume it's an old APCS-style ABI. */ | |
9870 | /* XXX WinCE? */ | |
9871 | arm_abi = ARM_ABI_APCS; | |
9872 | break; | |
9873 | ||
9874 | case bfd_target_elf_flavour: | |
9875 | ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI]; | |
9876 | e_flags = elf_elfheader (info.abfd)->e_flags; | |
9877 | ||
9878 | if (ei_osabi == ELFOSABI_ARM) | |
9879 | { | |
9880 | /* GNU tools used to use this value, but do not for EABI | |
9881 | objects. There's nowhere to tag an EABI version | |
9882 | anyway, so assume APCS. */ | |
9883 | arm_abi = ARM_ABI_APCS; | |
9884 | } | |
9885 | else if (ei_osabi == ELFOSABI_NONE) | |
9886 | { | |
9887 | int eabi_ver = EF_ARM_EABI_VERSION (e_flags); | |
9888 | int attr_arch, attr_profile; | |
9889 | ||
9890 | switch (eabi_ver) | |
9891 | { | |
9892 | case EF_ARM_EABI_UNKNOWN: | |
9893 | /* Assume GNU tools. */ | |
9894 | arm_abi = ARM_ABI_APCS; | |
9895 | break; | |
9896 | ||
9897 | case EF_ARM_EABI_VER4: | |
9898 | case EF_ARM_EABI_VER5: | |
9899 | arm_abi = ARM_ABI_AAPCS; | |
9900 | /* EABI binaries default to VFP float ordering. | |
9901 | They may also contain build attributes that can | |
9902 | be used to identify if the VFP argument-passing | |
9903 | ABI is in use. */ | |
9904 | if (fp_model == ARM_FLOAT_AUTO) | |
9905 | { | |
9906 | #ifdef HAVE_ELF | |
9907 | switch (bfd_elf_get_obj_attr_int (info.abfd, | |
9908 | OBJ_ATTR_PROC, | |
9909 | Tag_ABI_VFP_args)) | |
9910 | { | |
9911 | case 0: | |
9912 | /* "The user intended FP parameter/result | |
9913 | passing to conform to AAPCS, base | |
9914 | variant". */ | |
9915 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9916 | break; | |
9917 | case 1: | |
9918 | /* "The user intended FP parameter/result | |
9919 | passing to conform to AAPCS, VFP | |
9920 | variant". */ | |
9921 | fp_model = ARM_FLOAT_VFP; | |
9922 | break; | |
9923 | case 2: | |
9924 | /* "The user intended FP parameter/result | |
9925 | passing to conform to tool chain-specific | |
9926 | conventions" - we don't know any such | |
9927 | conventions, so leave it as "auto". */ | |
9928 | break; | |
9929 | default: | |
9930 | /* Attribute value not mentioned in the | |
9931 | October 2008 ABI, so leave it as | |
9932 | "auto". */ | |
9933 | break; | |
9934 | } | |
9935 | #else | |
9936 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9937 | #endif | |
9938 | } | |
9939 | break; | |
9940 | ||
9941 | default: | |
9942 | /* Leave it as "auto". */ | |
9943 | warning (_("unknown ARM EABI version 0x%x"), eabi_ver); | |
9944 | break; | |
9945 | } | |
9946 | ||
9947 | #ifdef HAVE_ELF | |
9948 | /* Detect M-profile programs. This only works if the | |
9949 | executable file includes build attributes; GCC does | |
9950 | copy them to the executable, but e.g. RealView does | |
9951 | not. */ | |
9952 | attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, | |
9953 | Tag_CPU_arch); | |
0963b4bd MS |
9954 | attr_profile = bfd_elf_get_obj_attr_int (info.abfd, |
9955 | OBJ_ATTR_PROC, | |
9779414d DJ |
9956 | Tag_CPU_arch_profile); |
9957 | /* GCC specifies the profile for v6-M; RealView only | |
9958 | specifies the profile for architectures starting with | |
9959 | V7 (as opposed to architectures with a tag | |
9960 | numerically greater than TAG_CPU_ARCH_V7). */ | |
9961 | if (!tdesc_has_registers (tdesc) | |
9962 | && (attr_arch == TAG_CPU_ARCH_V6_M | |
9963 | || attr_arch == TAG_CPU_ARCH_V6S_M | |
9964 | || attr_profile == 'M')) | |
25f8c692 | 9965 | is_m = 1; |
9779414d DJ |
9966 | #endif |
9967 | } | |
9968 | ||
9969 | if (fp_model == ARM_FLOAT_AUTO) | |
9970 | { | |
9971 | int e_flags = elf_elfheader (info.abfd)->e_flags; | |
9972 | ||
9973 | switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT)) | |
9974 | { | |
9975 | case 0: | |
9976 | /* Leave it as "auto". Strictly speaking this case | |
9977 | means FPA, but almost nobody uses that now, and | |
9978 | many toolchains fail to set the appropriate bits | |
9979 | for the floating-point model they use. */ | |
9980 | break; | |
9981 | case EF_ARM_SOFT_FLOAT: | |
9982 | fp_model = ARM_FLOAT_SOFT_FPA; | |
9983 | break; | |
9984 | case EF_ARM_VFP_FLOAT: | |
9985 | fp_model = ARM_FLOAT_VFP; | |
9986 | break; | |
9987 | case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT: | |
9988 | fp_model = ARM_FLOAT_SOFT_VFP; | |
9989 | break; | |
9990 | } | |
9991 | } | |
9992 | ||
9993 | if (e_flags & EF_ARM_BE8) | |
9994 | info.byte_order_for_code = BFD_ENDIAN_LITTLE; | |
9995 | ||
9996 | break; | |
9997 | ||
9998 | default: | |
9999 | /* Leave it as "auto". */ | |
10000 | break; | |
10001 | } | |
10002 | } | |
123dc839 DJ |
10003 | |
10004 | /* Check any target description for validity. */ | |
9779414d | 10005 | if (tdesc_has_registers (tdesc)) |
123dc839 DJ |
10006 | { |
10007 | /* For most registers we require GDB's default names; but also allow | |
10008 | the numeric names for sp / lr / pc, as a convenience. */ | |
10009 | static const char *const arm_sp_names[] = { "r13", "sp", NULL }; | |
10010 | static const char *const arm_lr_names[] = { "r14", "lr", NULL }; | |
10011 | static const char *const arm_pc_names[] = { "r15", "pc", NULL }; | |
10012 | ||
10013 | const struct tdesc_feature *feature; | |
58d6951d | 10014 | int valid_p; |
123dc839 | 10015 | |
9779414d | 10016 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
10017 | "org.gnu.gdb.arm.core"); |
10018 | if (feature == NULL) | |
9779414d DJ |
10019 | { |
10020 | feature = tdesc_find_feature (tdesc, | |
10021 | "org.gnu.gdb.arm.m-profile"); | |
10022 | if (feature == NULL) | |
10023 | return NULL; | |
10024 | else | |
10025 | is_m = 1; | |
10026 | } | |
123dc839 DJ |
10027 | |
10028 | tdesc_data = tdesc_data_alloc (); | |
10029 | ||
10030 | valid_p = 1; | |
10031 | for (i = 0; i < ARM_SP_REGNUM; i++) | |
10032 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
10033 | arm_register_names[i]); | |
10034 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10035 | ARM_SP_REGNUM, | |
10036 | arm_sp_names); | |
10037 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10038 | ARM_LR_REGNUM, | |
10039 | arm_lr_names); | |
10040 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
10041 | ARM_PC_REGNUM, | |
10042 | arm_pc_names); | |
9779414d DJ |
10043 | if (is_m) |
10044 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10045 | ARM_PS_REGNUM, "xpsr"); | |
10046 | else | |
10047 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10048 | ARM_PS_REGNUM, "cpsr"); | |
123dc839 DJ |
10049 | |
10050 | if (!valid_p) | |
10051 | { | |
10052 | tdesc_data_cleanup (tdesc_data); | |
10053 | return NULL; | |
10054 | } | |
10055 | ||
9779414d | 10056 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
10057 | "org.gnu.gdb.arm.fpa"); |
10058 | if (feature != NULL) | |
10059 | { | |
10060 | valid_p = 1; | |
10061 | for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++) | |
10062 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
10063 | arm_register_names[i]); | |
10064 | if (!valid_p) | |
10065 | { | |
10066 | tdesc_data_cleanup (tdesc_data); | |
10067 | return NULL; | |
10068 | } | |
10069 | } | |
ff6f572f DJ |
10070 | else |
10071 | have_fpa_registers = 0; | |
10072 | ||
9779414d | 10073 | feature = tdesc_find_feature (tdesc, |
ff6f572f DJ |
10074 | "org.gnu.gdb.xscale.iwmmxt"); |
10075 | if (feature != NULL) | |
10076 | { | |
10077 | static const char *const iwmmxt_names[] = { | |
10078 | "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7", | |
10079 | "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15", | |
10080 | "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "", | |
10081 | "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "", | |
10082 | }; | |
10083 | ||
10084 | valid_p = 1; | |
10085 | for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++) | |
10086 | valid_p | |
10087 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
10088 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10089 | ||
10090 | /* Check for the control registers, but do not fail if they | |
10091 | are missing. */ | |
10092 | for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++) | |
10093 | tdesc_numbered_register (feature, tdesc_data, i, | |
10094 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10095 | ||
10096 | for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++) | |
10097 | valid_p | |
10098 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
10099 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
10100 | ||
10101 | if (!valid_p) | |
10102 | { | |
10103 | tdesc_data_cleanup (tdesc_data); | |
10104 | return NULL; | |
10105 | } | |
10106 | } | |
58d6951d DJ |
10107 | |
10108 | /* If we have a VFP unit, check whether the single precision registers | |
10109 | are present. If not, then we will synthesize them as pseudo | |
10110 | registers. */ | |
9779414d | 10111 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
10112 | "org.gnu.gdb.arm.vfp"); |
10113 | if (feature != NULL) | |
10114 | { | |
10115 | static const char *const vfp_double_names[] = { | |
10116 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
10117 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", | |
10118 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", | |
10119 | "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", | |
10120 | }; | |
10121 | ||
10122 | /* Require the double precision registers. There must be either | |
10123 | 16 or 32. */ | |
10124 | valid_p = 1; | |
10125 | for (i = 0; i < 32; i++) | |
10126 | { | |
10127 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10128 | ARM_D0_REGNUM + i, | |
10129 | vfp_double_names[i]); | |
10130 | if (!valid_p) | |
10131 | break; | |
10132 | } | |
2b9e5ea6 UW |
10133 | if (!valid_p && i == 16) |
10134 | valid_p = 1; | |
58d6951d | 10135 | |
2b9e5ea6 UW |
10136 | /* Also require FPSCR. */ |
10137 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
10138 | ARM_FPSCR_REGNUM, "fpscr"); | |
10139 | if (!valid_p) | |
58d6951d DJ |
10140 | { |
10141 | tdesc_data_cleanup (tdesc_data); | |
10142 | return NULL; | |
10143 | } | |
10144 | ||
10145 | if (tdesc_unnumbered_register (feature, "s0") == 0) | |
10146 | have_vfp_pseudos = 1; | |
10147 | ||
10148 | have_vfp_registers = 1; | |
10149 | ||
10150 | /* If we have VFP, also check for NEON. The architecture allows | |
10151 | NEON without VFP (integer vector operations only), but GDB | |
10152 | does not support that. */ | |
9779414d | 10153 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
10154 | "org.gnu.gdb.arm.neon"); |
10155 | if (feature != NULL) | |
10156 | { | |
10157 | /* NEON requires 32 double-precision registers. */ | |
10158 | if (i != 32) | |
10159 | { | |
10160 | tdesc_data_cleanup (tdesc_data); | |
10161 | return NULL; | |
10162 | } | |
10163 | ||
10164 | /* If there are quad registers defined by the stub, use | |
10165 | their type; otherwise (normally) provide them with | |
10166 | the default type. */ | |
10167 | if (tdesc_unnumbered_register (feature, "q0") == 0) | |
10168 | have_neon_pseudos = 1; | |
10169 | ||
10170 | have_neon = 1; | |
10171 | } | |
10172 | } | |
123dc839 | 10173 | } |
39bbf761 | 10174 | |
28e97307 DJ |
10175 | /* If there is already a candidate, use it. */ |
10176 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
10177 | best_arch != NULL; | |
10178 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
10179 | { | |
b8926edc DJ |
10180 | if (arm_abi != ARM_ABI_AUTO |
10181 | && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi) | |
28e97307 DJ |
10182 | continue; |
10183 | ||
b8926edc DJ |
10184 | if (fp_model != ARM_FLOAT_AUTO |
10185 | && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model) | |
28e97307 DJ |
10186 | continue; |
10187 | ||
58d6951d DJ |
10188 | /* There are various other properties in tdep that we do not |
10189 | need to check here: those derived from a target description, | |
10190 | since gdbarches with a different target description are | |
10191 | automatically disqualified. */ | |
10192 | ||
9779414d DJ |
10193 | /* Do check is_m, though, since it might come from the binary. */ |
10194 | if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m) | |
10195 | continue; | |
10196 | ||
28e97307 DJ |
10197 | /* Found a match. */ |
10198 | break; | |
10199 | } | |
97e03143 | 10200 | |
28e97307 | 10201 | if (best_arch != NULL) |
123dc839 DJ |
10202 | { |
10203 | if (tdesc_data != NULL) | |
10204 | tdesc_data_cleanup (tdesc_data); | |
10205 | return best_arch->gdbarch; | |
10206 | } | |
28e97307 DJ |
10207 | |
10208 | tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); | |
97e03143 RE |
10209 | gdbarch = gdbarch_alloc (&info, tdep); |
10210 | ||
28e97307 DJ |
10211 | /* Record additional information about the architecture we are defining. |
10212 | These are gdbarch discriminators, like the OSABI. */ | |
10213 | tdep->arm_abi = arm_abi; | |
10214 | tdep->fp_model = fp_model; | |
9779414d | 10215 | tdep->is_m = is_m; |
ff6f572f | 10216 | tdep->have_fpa_registers = have_fpa_registers; |
58d6951d DJ |
10217 | tdep->have_vfp_registers = have_vfp_registers; |
10218 | tdep->have_vfp_pseudos = have_vfp_pseudos; | |
10219 | tdep->have_neon_pseudos = have_neon_pseudos; | |
10220 | tdep->have_neon = have_neon; | |
08216dd7 | 10221 | |
25f8c692 JL |
10222 | arm_register_g_packet_guesses (gdbarch); |
10223 | ||
08216dd7 | 10224 | /* Breakpoints. */ |
9d4fde75 | 10225 | switch (info.byte_order_for_code) |
67255d04 RE |
10226 | { |
10227 | case BFD_ENDIAN_BIG: | |
66e810cd RE |
10228 | tdep->arm_breakpoint = arm_default_arm_be_breakpoint; |
10229 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint); | |
10230 | tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint; | |
10231 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint); | |
10232 | ||
67255d04 RE |
10233 | break; |
10234 | ||
10235 | case BFD_ENDIAN_LITTLE: | |
66e810cd RE |
10236 | tdep->arm_breakpoint = arm_default_arm_le_breakpoint; |
10237 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint); | |
10238 | tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint; | |
10239 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint); | |
10240 | ||
67255d04 RE |
10241 | break; |
10242 | ||
10243 | default: | |
10244 | internal_error (__FILE__, __LINE__, | |
edefbb7c | 10245 | _("arm_gdbarch_init: bad byte order for float format")); |
67255d04 RE |
10246 | } |
10247 | ||
d7b486e7 RE |
10248 | /* On ARM targets char defaults to unsigned. */ |
10249 | set_gdbarch_char_signed (gdbarch, 0); | |
10250 | ||
cca44b1b JB |
10251 | /* Note: for displaced stepping, this includes the breakpoint, and one word |
10252 | of additional scratch space. This setting isn't used for anything beside | |
10253 | displaced stepping at present. */ | |
10254 | set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS); | |
10255 | ||
9df628e0 | 10256 | /* This should be low enough for everything. */ |
97e03143 | 10257 | tdep->lowest_pc = 0x20; |
94c30b78 | 10258 | tdep->jb_pc = -1; /* Longjump support not enabled by default. */ |
97e03143 | 10259 | |
7c00367c MK |
10260 | /* The default, for both APCS and AAPCS, is to return small |
10261 | structures in registers. */ | |
10262 | tdep->struct_return = reg_struct_return; | |
10263 | ||
2dd604e7 | 10264 | set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call); |
f53f0d0b | 10265 | set_gdbarch_frame_align (gdbarch, arm_frame_align); |
39bbf761 | 10266 | |
756fe439 DJ |
10267 | set_gdbarch_write_pc (gdbarch, arm_write_pc); |
10268 | ||
148754e5 | 10269 | /* Frame handling. */ |
a262aec2 | 10270 | set_gdbarch_dummy_id (gdbarch, arm_dummy_id); |
eb5492fa DJ |
10271 | set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc); |
10272 | set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp); | |
10273 | ||
eb5492fa | 10274 | frame_base_set_default (gdbarch, &arm_normal_base); |
148754e5 | 10275 | |
34e8f22d | 10276 | /* Address manipulation. */ |
34e8f22d RE |
10277 | set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove); |
10278 | ||
34e8f22d RE |
10279 | /* Advance PC across function entry code. */ |
10280 | set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue); | |
10281 | ||
4024ca99 UW |
10282 | /* Detect whether PC is in function epilogue. */ |
10283 | set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p); | |
10284 | ||
190dce09 UW |
10285 | /* Skip trampolines. */ |
10286 | set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub); | |
10287 | ||
34e8f22d RE |
10288 | /* The stack grows downward. */ |
10289 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
10290 | ||
10291 | /* Breakpoint manipulation. */ | |
10292 | set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc); | |
177321bd DJ |
10293 | set_gdbarch_remote_breakpoint_from_pc (gdbarch, |
10294 | arm_remote_breakpoint_from_pc); | |
34e8f22d RE |
10295 | |
10296 | /* Information about registers, etc. */ | |
34e8f22d RE |
10297 | set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM); |
10298 | set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM); | |
ff6f572f | 10299 | set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS); |
7a5ea0d4 | 10300 | set_gdbarch_register_type (gdbarch, arm_register_type); |
54483882 | 10301 | set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p); |
34e8f22d | 10302 | |
ff6f572f DJ |
10303 | /* This "info float" is FPA-specific. Use the generic version if we |
10304 | do not have FPA. */ | |
10305 | if (gdbarch_tdep (gdbarch)->have_fpa_registers) | |
10306 | set_gdbarch_print_float_info (gdbarch, arm_print_float_info); | |
10307 | ||
26216b98 | 10308 | /* Internal <-> external register number maps. */ |
ff6f572f | 10309 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum); |
26216b98 AC |
10310 | set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno); |
10311 | ||
34e8f22d RE |
10312 | set_gdbarch_register_name (gdbarch, arm_register_name); |
10313 | ||
10314 | /* Returning results. */ | |
2af48f68 | 10315 | set_gdbarch_return_value (gdbarch, arm_return_value); |
34e8f22d | 10316 | |
03d48a7d RE |
10317 | /* Disassembly. */ |
10318 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm); | |
10319 | ||
34e8f22d RE |
10320 | /* Minsymbol frobbing. */ |
10321 | set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special); | |
10322 | set_gdbarch_coff_make_msymbol_special (gdbarch, | |
10323 | arm_coff_make_msymbol_special); | |
60c5725c | 10324 | set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol); |
34e8f22d | 10325 | |
f9d67f43 DJ |
10326 | /* Thumb-2 IT block support. */ |
10327 | set_gdbarch_adjust_breakpoint_address (gdbarch, | |
10328 | arm_adjust_breakpoint_address); | |
10329 | ||
0d5de010 DJ |
10330 | /* Virtual tables. */ |
10331 | set_gdbarch_vbit_in_delta (gdbarch, 1); | |
10332 | ||
97e03143 | 10333 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
4be87837 | 10334 | gdbarch_init_osabi (info, gdbarch); |
97e03143 | 10335 | |
b39cc962 DJ |
10336 | dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg); |
10337 | ||
eb5492fa | 10338 | /* Add some default predicates. */ |
2ae28aa9 YQ |
10339 | if (is_m) |
10340 | frame_unwind_append_unwinder (gdbarch, &arm_m_exception_unwind); | |
a262aec2 DJ |
10341 | frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind); |
10342 | dwarf2_append_unwinders (gdbarch); | |
0e9e9abd | 10343 | frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind); |
a262aec2 | 10344 | frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind); |
eb5492fa | 10345 | |
97e03143 RE |
10346 | /* Now we have tuned the configuration, set a few final things, |
10347 | based on what the OS ABI has told us. */ | |
10348 | ||
b8926edc DJ |
10349 | /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI |
10350 | binaries are always marked. */ | |
10351 | if (tdep->arm_abi == ARM_ABI_AUTO) | |
10352 | tdep->arm_abi = ARM_ABI_APCS; | |
10353 | ||
e3039479 UW |
10354 | /* Watchpoints are not steppable. */ |
10355 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); | |
10356 | ||
b8926edc DJ |
10357 | /* We used to default to FPA for generic ARM, but almost nobody |
10358 | uses that now, and we now provide a way for the user to force | |
10359 | the model. So default to the most useful variant. */ | |
10360 | if (tdep->fp_model == ARM_FLOAT_AUTO) | |
10361 | tdep->fp_model = ARM_FLOAT_SOFT_FPA; | |
10362 | ||
9df628e0 RE |
10363 | if (tdep->jb_pc >= 0) |
10364 | set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target); | |
10365 | ||
08216dd7 | 10366 | /* Floating point sizes and format. */ |
8da61cc4 | 10367 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
b8926edc | 10368 | if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA) |
08216dd7 | 10369 | { |
8da61cc4 DJ |
10370 | set_gdbarch_double_format |
10371 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
10372 | set_gdbarch_long_double_format | |
10373 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
10374 | } | |
10375 | else | |
10376 | { | |
10377 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
10378 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
08216dd7 RE |
10379 | } |
10380 | ||
58d6951d DJ |
10381 | if (have_vfp_pseudos) |
10382 | { | |
10383 | /* NOTE: These are the only pseudo registers used by | |
10384 | the ARM target at the moment. If more are added, a | |
10385 | little more care in numbering will be needed. */ | |
10386 | ||
10387 | int num_pseudos = 32; | |
10388 | if (have_neon_pseudos) | |
10389 | num_pseudos += 16; | |
10390 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos); | |
10391 | set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read); | |
10392 | set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write); | |
10393 | } | |
10394 | ||
123dc839 | 10395 | if (tdesc_data) |
58d6951d DJ |
10396 | { |
10397 | set_tdesc_pseudo_register_name (gdbarch, arm_register_name); | |
10398 | ||
9779414d | 10399 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
58d6951d DJ |
10400 | |
10401 | /* Override tdesc_register_type to adjust the types of VFP | |
10402 | registers for NEON. */ | |
10403 | set_gdbarch_register_type (gdbarch, arm_register_type); | |
10404 | } | |
123dc839 DJ |
10405 | |
10406 | /* Add standard register aliases. We add aliases even for those | |
10407 | nanes which are used by the current architecture - it's simpler, | |
10408 | and does no harm, since nothing ever lists user registers. */ | |
10409 | for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++) | |
10410 | user_reg_add (gdbarch, arm_register_aliases[i].name, | |
10411 | value_of_arm_user_reg, &arm_register_aliases[i].regnum); | |
10412 | ||
39bbf761 RE |
10413 | return gdbarch; |
10414 | } | |
10415 | ||
97e03143 | 10416 | static void |
2af46ca0 | 10417 | arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
97e03143 | 10418 | { |
2af46ca0 | 10419 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
97e03143 RE |
10420 | |
10421 | if (tdep == NULL) | |
10422 | return; | |
10423 | ||
edefbb7c | 10424 | fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"), |
97e03143 RE |
10425 | (unsigned long) tdep->lowest_pc); |
10426 | } | |
10427 | ||
a78f21af AC |
10428 | extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */ |
10429 | ||
c906108c | 10430 | void |
ed9a39eb | 10431 | _initialize_arm_tdep (void) |
c906108c | 10432 | { |
bc90b915 FN |
10433 | struct ui_file *stb; |
10434 | long length; | |
26304000 | 10435 | struct cmd_list_element *new_set, *new_show; |
53904c9e AC |
10436 | const char *setname; |
10437 | const char *setdesc; | |
4bd7b427 | 10438 | const char *const *regnames; |
bc90b915 FN |
10439 | int numregs, i, j; |
10440 | static char *helptext; | |
edefbb7c AC |
10441 | char regdesc[1024], *rdptr = regdesc; |
10442 | size_t rest = sizeof (regdesc); | |
085dd6e6 | 10443 | |
42cf1509 | 10444 | gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep); |
97e03143 | 10445 | |
60c5725c | 10446 | arm_objfile_data_key |
c1bd65d0 | 10447 | = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free); |
60c5725c | 10448 | |
0e9e9abd UW |
10449 | /* Add ourselves to objfile event chain. */ |
10450 | observer_attach_new_objfile (arm_exidx_new_objfile); | |
10451 | arm_exidx_data_key | |
10452 | = register_objfile_data_with_cleanup (NULL, arm_exidx_data_free); | |
10453 | ||
70f80edf JT |
10454 | /* Register an ELF OS ABI sniffer for ARM binaries. */ |
10455 | gdbarch_register_osabi_sniffer (bfd_arch_arm, | |
10456 | bfd_target_elf_flavour, | |
10457 | arm_elf_osabi_sniffer); | |
10458 | ||
9779414d DJ |
10459 | /* Initialize the standard target descriptions. */ |
10460 | initialize_tdesc_arm_with_m (); | |
25f8c692 | 10461 | initialize_tdesc_arm_with_m_fpa_layout (); |
3184d3f9 | 10462 | initialize_tdesc_arm_with_m_vfp_d16 (); |
ef7e8358 UW |
10463 | initialize_tdesc_arm_with_iwmmxt (); |
10464 | initialize_tdesc_arm_with_vfpv2 (); | |
10465 | initialize_tdesc_arm_with_vfpv3 (); | |
10466 | initialize_tdesc_arm_with_neon (); | |
9779414d | 10467 | |
94c30b78 | 10468 | /* Get the number of possible sets of register names defined in opcodes. */ |
afd7eef0 RE |
10469 | num_disassembly_options = get_arm_regname_num_options (); |
10470 | ||
10471 | /* Add root prefix command for all "set arm"/"show arm" commands. */ | |
10472 | add_prefix_cmd ("arm", no_class, set_arm_command, | |
edefbb7c | 10473 | _("Various ARM-specific commands."), |
afd7eef0 RE |
10474 | &setarmcmdlist, "set arm ", 0, &setlist); |
10475 | ||
10476 | add_prefix_cmd ("arm", no_class, show_arm_command, | |
edefbb7c | 10477 | _("Various ARM-specific commands."), |
afd7eef0 | 10478 | &showarmcmdlist, "show arm ", 0, &showlist); |
bc90b915 | 10479 | |
94c30b78 | 10480 | /* Sync the opcode insn printer with our register viewer. */ |
bc90b915 | 10481 | parse_arm_disassembler_option ("reg-names-std"); |
c5aa993b | 10482 | |
eefe576e AC |
10483 | /* Initialize the array that will be passed to |
10484 | add_setshow_enum_cmd(). */ | |
afd7eef0 RE |
10485 | valid_disassembly_styles |
10486 | = xmalloc ((num_disassembly_options + 1) * sizeof (char *)); | |
10487 | for (i = 0; i < num_disassembly_options; i++) | |
bc90b915 FN |
10488 | { |
10489 | numregs = get_arm_regnames (i, &setname, &setdesc, ®names); | |
afd7eef0 | 10490 | valid_disassembly_styles[i] = setname; |
edefbb7c AC |
10491 | length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc); |
10492 | rdptr += length; | |
10493 | rest -= length; | |
123dc839 DJ |
10494 | /* When we find the default names, tell the disassembler to use |
10495 | them. */ | |
bc90b915 FN |
10496 | if (!strcmp (setname, "std")) |
10497 | { | |
afd7eef0 | 10498 | disassembly_style = setname; |
bc90b915 FN |
10499 | set_arm_regname_option (i); |
10500 | } | |
10501 | } | |
94c30b78 | 10502 | /* Mark the end of valid options. */ |
afd7eef0 | 10503 | valid_disassembly_styles[num_disassembly_options] = NULL; |
c906108c | 10504 | |
edefbb7c AC |
10505 | /* Create the help text. */ |
10506 | stb = mem_fileopen (); | |
10507 | fprintf_unfiltered (stb, "%s%s%s", | |
10508 | _("The valid values are:\n"), | |
10509 | regdesc, | |
10510 | _("The default is \"std\".")); | |
759ef836 | 10511 | helptext = ui_file_xstrdup (stb, NULL); |
bc90b915 | 10512 | ui_file_delete (stb); |
ed9a39eb | 10513 | |
edefbb7c AC |
10514 | add_setshow_enum_cmd("disassembler", no_class, |
10515 | valid_disassembly_styles, &disassembly_style, | |
10516 | _("Set the disassembly style."), | |
10517 | _("Show the disassembly style."), | |
10518 | helptext, | |
2c5b56ce | 10519 | set_disassembly_style_sfunc, |
0963b4bd MS |
10520 | NULL, /* FIXME: i18n: The disassembly style is |
10521 | \"%s\". */ | |
7376b4c2 | 10522 | &setarmcmdlist, &showarmcmdlist); |
edefbb7c AC |
10523 | |
10524 | add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32, | |
10525 | _("Set usage of ARM 32-bit mode."), | |
10526 | _("Show usage of ARM 32-bit mode."), | |
10527 | _("When off, a 26-bit PC will be used."), | |
2c5b56ce | 10528 | NULL, |
0963b4bd MS |
10529 | NULL, /* FIXME: i18n: Usage of ARM 32-bit |
10530 | mode is %s. */ | |
26304000 | 10531 | &setarmcmdlist, &showarmcmdlist); |
c906108c | 10532 | |
fd50bc42 | 10533 | /* Add a command to allow the user to force the FPU model. */ |
edefbb7c AC |
10534 | add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model, |
10535 | _("Set the floating point type."), | |
10536 | _("Show the floating point type."), | |
10537 | _("auto - Determine the FP typefrom the OS-ABI.\n\ | |
10538 | softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\ | |
10539 | fpa - FPA co-processor (GCC compiled).\n\ | |
10540 | softvfp - Software FP with pure-endian doubles.\n\ | |
10541 | vfp - VFP co-processor."), | |
edefbb7c | 10542 | set_fp_model_sfunc, show_fp_model, |
7376b4c2 | 10543 | &setarmcmdlist, &showarmcmdlist); |
fd50bc42 | 10544 | |
28e97307 DJ |
10545 | /* Add a command to allow the user to force the ABI. */ |
10546 | add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string, | |
10547 | _("Set the ABI."), | |
10548 | _("Show the ABI."), | |
10549 | NULL, arm_set_abi, arm_show_abi, | |
10550 | &setarmcmdlist, &showarmcmdlist); | |
10551 | ||
0428b8f5 DJ |
10552 | /* Add two commands to allow the user to force the assumed |
10553 | execution mode. */ | |
10554 | add_setshow_enum_cmd ("fallback-mode", class_support, | |
10555 | arm_mode_strings, &arm_fallback_mode_string, | |
10556 | _("Set the mode assumed when symbols are unavailable."), | |
10557 | _("Show the mode assumed when symbols are unavailable."), | |
10558 | NULL, NULL, arm_show_fallback_mode, | |
10559 | &setarmcmdlist, &showarmcmdlist); | |
10560 | add_setshow_enum_cmd ("force-mode", class_support, | |
10561 | arm_mode_strings, &arm_force_mode_string, | |
10562 | _("Set the mode assumed even when symbols are available."), | |
10563 | _("Show the mode assumed even when symbols are available."), | |
10564 | NULL, NULL, arm_show_force_mode, | |
10565 | &setarmcmdlist, &showarmcmdlist); | |
10566 | ||
6529d2dd | 10567 | /* Debugging flag. */ |
edefbb7c AC |
10568 | add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug, |
10569 | _("Set ARM debugging."), | |
10570 | _("Show ARM debugging."), | |
10571 | _("When on, arm-specific debugging is enabled."), | |
2c5b56ce | 10572 | NULL, |
7915a72c | 10573 | NULL, /* FIXME: i18n: "ARM debugging is %s. */ |
26304000 | 10574 | &setdebuglist, &showdebuglist); |
c906108c | 10575 | } |
72508ac0 PO |
10576 | |
10577 | /* ARM-reversible process record data structures. */ | |
10578 | ||
10579 | #define ARM_INSN_SIZE_BYTES 4 | |
10580 | #define THUMB_INSN_SIZE_BYTES 2 | |
10581 | #define THUMB2_INSN_SIZE_BYTES 4 | |
10582 | ||
10583 | ||
10584 | #define INSN_S_L_BIT_NUM 20 | |
10585 | ||
10586 | #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \ | |
10587 | do \ | |
10588 | { \ | |
10589 | unsigned int reg_len = LENGTH; \ | |
10590 | if (reg_len) \ | |
10591 | { \ | |
10592 | REGS = XNEWVEC (uint32_t, reg_len); \ | |
10593 | memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \ | |
10594 | } \ | |
10595 | } \ | |
10596 | while (0) | |
10597 | ||
10598 | #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \ | |
10599 | do \ | |
10600 | { \ | |
10601 | unsigned int mem_len = LENGTH; \ | |
10602 | if (mem_len) \ | |
10603 | { \ | |
10604 | MEMS = XNEWVEC (struct arm_mem_r, mem_len); \ | |
10605 | memcpy(&MEMS->len, &RECORD_BUF[0], \ | |
10606 | sizeof(struct arm_mem_r) * LENGTH); \ | |
10607 | } \ | |
10608 | } \ | |
10609 | while (0) | |
10610 | ||
10611 | /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */ | |
10612 | #define INSN_RECORDED(ARM_RECORD) \ | |
10613 | (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count) | |
10614 | ||
10615 | /* ARM memory record structure. */ | |
10616 | struct arm_mem_r | |
10617 | { | |
10618 | uint32_t len; /* Record length. */ | |
10619 | CORE_ADDR addr; /* Memory address. */ | |
10620 | }; | |
10621 | ||
10622 | /* ARM instruction record contains opcode of current insn | |
10623 | and execution state (before entry to decode_insn()), | |
10624 | contains list of to-be-modified registers and | |
10625 | memory blocks (on return from decode_insn()). */ | |
10626 | ||
10627 | typedef struct insn_decode_record_t | |
10628 | { | |
10629 | struct gdbarch *gdbarch; | |
10630 | struct regcache *regcache; | |
10631 | CORE_ADDR this_addr; /* Address of the insn being decoded. */ | |
10632 | uint32_t arm_insn; /* Should accommodate thumb. */ | |
10633 | uint32_t cond; /* Condition code. */ | |
10634 | uint32_t opcode; /* Insn opcode. */ | |
10635 | uint32_t decode; /* Insn decode bits. */ | |
10636 | uint32_t mem_rec_count; /* No of mem records. */ | |
10637 | uint32_t reg_rec_count; /* No of reg records. */ | |
10638 | uint32_t *arm_regs; /* Registers to be saved for this record. */ | |
10639 | struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */ | |
10640 | } insn_decode_record; | |
10641 | ||
10642 | ||
10643 | /* Checks ARM SBZ and SBO mandatory fields. */ | |
10644 | ||
10645 | static int | |
10646 | sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo) | |
10647 | { | |
10648 | uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1)); | |
10649 | ||
10650 | if (!len) | |
10651 | return 1; | |
10652 | ||
10653 | if (!sbo) | |
10654 | ones = ~ones; | |
10655 | ||
10656 | while (ones) | |
10657 | { | |
10658 | if (!(ones & sbo)) | |
10659 | { | |
10660 | return 0; | |
10661 | } | |
10662 | ones = ones >> 1; | |
10663 | } | |
10664 | return 1; | |
10665 | } | |
10666 | ||
10667 | typedef enum | |
10668 | { | |
10669 | ARM_RECORD_STRH=1, | |
10670 | ARM_RECORD_STRD | |
10671 | } arm_record_strx_t; | |
10672 | ||
10673 | typedef enum | |
10674 | { | |
10675 | ARM_RECORD=1, | |
10676 | THUMB_RECORD, | |
10677 | THUMB2_RECORD | |
10678 | } record_type_t; | |
10679 | ||
10680 | ||
10681 | static int | |
10682 | arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf, | |
10683 | uint32_t *record_buf_mem, arm_record_strx_t str_type) | |
10684 | { | |
10685 | ||
10686 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10687 | ULONGEST u_regval[2]= {0}; | |
10688 | ||
10689 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
10690 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
10691 | uint32_t opcode1 = 0; | |
10692 | ||
10693 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
10694 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
10695 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
10696 | ||
10697 | ||
10698 | if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
10699 | { | |
10700 | /* 1) Handle misc store, immediate offset. */ | |
10701 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
10702 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
10703 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10704 | regcache_raw_read_unsigned (reg_cache, reg_src1, | |
10705 | &u_regval[0]); | |
10706 | if (ARM_PC_REGNUM == reg_src1) | |
10707 | { | |
10708 | /* If R15 was used as Rn, hence current PC+8. */ | |
10709 | u_regval[0] = u_regval[0] + 8; | |
10710 | } | |
10711 | offset_8 = (immed_high << 4) | immed_low; | |
10712 | /* Calculate target store address. */ | |
10713 | if (14 == arm_insn_r->opcode) | |
10714 | { | |
10715 | tgt_mem_addr = u_regval[0] + offset_8; | |
10716 | } | |
10717 | else | |
10718 | { | |
10719 | tgt_mem_addr = u_regval[0] - offset_8; | |
10720 | } | |
10721 | if (ARM_RECORD_STRH == str_type) | |
10722 | { | |
10723 | record_buf_mem[0] = 2; | |
10724 | record_buf_mem[1] = tgt_mem_addr; | |
10725 | arm_insn_r->mem_rec_count = 1; | |
10726 | } | |
10727 | else if (ARM_RECORD_STRD == str_type) | |
10728 | { | |
10729 | record_buf_mem[0] = 4; | |
10730 | record_buf_mem[1] = tgt_mem_addr; | |
10731 | record_buf_mem[2] = 4; | |
10732 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10733 | arm_insn_r->mem_rec_count = 2; | |
10734 | } | |
10735 | } | |
10736 | else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode) | |
10737 | { | |
10738 | /* 2) Store, register offset. */ | |
10739 | /* Get Rm. */ | |
10740 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10741 | /* Get Rn. */ | |
10742 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10743 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10744 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10745 | if (15 == reg_src2) | |
10746 | { | |
10747 | /* If R15 was used as Rn, hence current PC+8. */ | |
10748 | u_regval[0] = u_regval[0] + 8; | |
10749 | } | |
10750 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10751 | if (12 == arm_insn_r->opcode) | |
10752 | { | |
10753 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10754 | } | |
10755 | else | |
10756 | { | |
10757 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10758 | } | |
10759 | if (ARM_RECORD_STRH == str_type) | |
10760 | { | |
10761 | record_buf_mem[0] = 2; | |
10762 | record_buf_mem[1] = tgt_mem_addr; | |
10763 | arm_insn_r->mem_rec_count = 1; | |
10764 | } | |
10765 | else if (ARM_RECORD_STRD == str_type) | |
10766 | { | |
10767 | record_buf_mem[0] = 4; | |
10768 | record_buf_mem[1] = tgt_mem_addr; | |
10769 | record_buf_mem[2] = 4; | |
10770 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10771 | arm_insn_r->mem_rec_count = 2; | |
10772 | } | |
10773 | } | |
10774 | else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
10775 | || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) | |
10776 | { | |
10777 | /* 3) Store, immediate pre-indexed. */ | |
10778 | /* 5) Store, immediate post-indexed. */ | |
10779 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); | |
10780 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); | |
10781 | offset_8 = (immed_high << 4) | immed_low; | |
10782 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
10783 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10784 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10785 | if (15 == arm_insn_r->opcode || 6 == 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 | /* Record Rn also as it changes. */ | |
10808 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
10809 | arm_insn_r->reg_rec_count = 1; | |
10810 | } | |
10811 | else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode | |
10812 | || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
10813 | { | |
10814 | /* 4) Store, register pre-indexed. */ | |
10815 | /* 6) Store, register post -indexed. */ | |
10816 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
10817 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
10818 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
10819 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
10820 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
10821 | if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) | |
10822 | { | |
10823 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
10824 | } | |
10825 | else | |
10826 | { | |
10827 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
10828 | } | |
10829 | if (ARM_RECORD_STRH == str_type) | |
10830 | { | |
10831 | record_buf_mem[0] = 2; | |
10832 | record_buf_mem[1] = tgt_mem_addr; | |
10833 | arm_insn_r->mem_rec_count = 1; | |
10834 | } | |
10835 | else if (ARM_RECORD_STRD == str_type) | |
10836 | { | |
10837 | record_buf_mem[0] = 4; | |
10838 | record_buf_mem[1] = tgt_mem_addr; | |
10839 | record_buf_mem[2] = 4; | |
10840 | record_buf_mem[3] = tgt_mem_addr + 4; | |
10841 | arm_insn_r->mem_rec_count = 2; | |
10842 | } | |
10843 | /* Record Rn also as it changes. */ | |
10844 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); | |
10845 | arm_insn_r->reg_rec_count = 1; | |
10846 | } | |
10847 | return 0; | |
10848 | } | |
10849 | ||
10850 | /* Handling ARM extension space insns. */ | |
10851 | ||
10852 | static int | |
10853 | arm_record_extension_space (insn_decode_record *arm_insn_r) | |
10854 | { | |
10855 | uint32_t ret = 0; /* Return value: -1:record failure ; 0:success */ | |
10856 | uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0; | |
10857 | uint32_t record_buf[8], record_buf_mem[8]; | |
10858 | uint32_t reg_src1 = 0; | |
10859 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; | |
10860 | struct regcache *reg_cache = arm_insn_r->regcache; | |
10861 | ULONGEST u_regval = 0; | |
10862 | ||
10863 | gdb_assert (!INSN_RECORDED(arm_insn_r)); | |
10864 | /* Handle unconditional insn extension space. */ | |
10865 | ||
10866 | opcode1 = bits (arm_insn_r->arm_insn, 20, 27); | |
10867 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10868 | if (arm_insn_r->cond) | |
10869 | { | |
10870 | /* PLD has no affect on architectural state, it just affects | |
10871 | the caches. */ | |
10872 | if (5 == ((opcode1 & 0xE0) >> 5)) | |
10873 | { | |
10874 | /* BLX(1) */ | |
10875 | record_buf[0] = ARM_PS_REGNUM; | |
10876 | record_buf[1] = ARM_LR_REGNUM; | |
10877 | arm_insn_r->reg_rec_count = 2; | |
10878 | } | |
10879 | /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */ | |
10880 | } | |
10881 | ||
10882 | ||
10883 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
10884 | if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4)) | |
10885 | { | |
10886 | ret = -1; | |
10887 | /* Undefined instruction on ARM V5; need to handle if later | |
10888 | versions define it. */ | |
10889 | } | |
10890 | ||
10891 | opcode1 = bits (arm_insn_r->arm_insn, 24, 27); | |
10892 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); | |
10893 | insn_op1 = bits (arm_insn_r->arm_insn, 20, 23); | |
10894 | ||
10895 | /* Handle arithmetic insn extension space. */ | |
10896 | if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond | |
10897 | && !INSN_RECORDED(arm_insn_r)) | |
10898 | { | |
10899 | /* Handle MLA(S) and MUL(S). */ | |
10900 | if (0 <= insn_op1 && 3 >= insn_op1) | |
10901 | { | |
10902 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10903 | record_buf[1] = ARM_PS_REGNUM; | |
10904 | arm_insn_r->reg_rec_count = 2; | |
10905 | } | |
10906 | else if (4 <= insn_op1 && 15 >= insn_op1) | |
10907 | { | |
10908 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ | |
10909 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
10910 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10911 | record_buf[2] = ARM_PS_REGNUM; | |
10912 | arm_insn_r->reg_rec_count = 3; | |
10913 | } | |
10914 | } | |
10915 | ||
10916 | opcode1 = bits (arm_insn_r->arm_insn, 26, 27); | |
10917 | opcode2 = bits (arm_insn_r->arm_insn, 23, 24); | |
10918 | insn_op1 = bits (arm_insn_r->arm_insn, 21, 22); | |
10919 | ||
10920 | /* Handle control insn extension space. */ | |
10921 | ||
10922 | if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20) | |
10923 | && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r)) | |
10924 | { | |
10925 | if (!bit (arm_insn_r->arm_insn,25)) | |
10926 | { | |
10927 | if (!bits (arm_insn_r->arm_insn, 4, 7)) | |
10928 | { | |
10929 | if ((0 == insn_op1) || (2 == insn_op1)) | |
10930 | { | |
10931 | /* MRS. */ | |
10932 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10933 | arm_insn_r->reg_rec_count = 1; | |
10934 | } | |
10935 | else if (1 == insn_op1) | |
10936 | { | |
10937 | /* CSPR is going to be changed. */ | |
10938 | record_buf[0] = ARM_PS_REGNUM; | |
10939 | arm_insn_r->reg_rec_count = 1; | |
10940 | } | |
10941 | else if (3 == insn_op1) | |
10942 | { | |
10943 | /* SPSR is going to be changed. */ | |
10944 | /* We need to get SPSR value, which is yet to be done. */ | |
10945 | printf_unfiltered (_("Process record does not support " | |
10946 | "instruction 0x%0x at address %s.\n"), | |
10947 | arm_insn_r->arm_insn, | |
10948 | paddress (arm_insn_r->gdbarch, | |
10949 | arm_insn_r->this_addr)); | |
10950 | return -1; | |
10951 | } | |
10952 | } | |
10953 | else if (1 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10954 | { | |
10955 | if (1 == insn_op1) | |
10956 | { | |
10957 | /* BX. */ | |
10958 | record_buf[0] = ARM_PS_REGNUM; | |
10959 | arm_insn_r->reg_rec_count = 1; | |
10960 | } | |
10961 | else if (3 == insn_op1) | |
10962 | { | |
10963 | /* CLZ. */ | |
10964 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
10965 | arm_insn_r->reg_rec_count = 1; | |
10966 | } | |
10967 | } | |
10968 | else if (3 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10969 | { | |
10970 | /* BLX. */ | |
10971 | record_buf[0] = ARM_PS_REGNUM; | |
10972 | record_buf[1] = ARM_LR_REGNUM; | |
10973 | arm_insn_r->reg_rec_count = 2; | |
10974 | } | |
10975 | else if (5 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10976 | { | |
10977 | /* QADD, QSUB, QDADD, QDSUB */ | |
10978 | record_buf[0] = ARM_PS_REGNUM; | |
10979 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
10980 | arm_insn_r->reg_rec_count = 2; | |
10981 | } | |
10982 | else if (7 == bits (arm_insn_r->arm_insn, 4, 7)) | |
10983 | { | |
10984 | /* BKPT. */ | |
10985 | record_buf[0] = ARM_PS_REGNUM; | |
10986 | record_buf[1] = ARM_LR_REGNUM; | |
10987 | arm_insn_r->reg_rec_count = 2; | |
10988 | ||
10989 | /* Save SPSR also;how? */ | |
10990 | printf_unfiltered (_("Process record does not support " | |
10991 | "instruction 0x%0x at address %s.\n"), | |
10992 | arm_insn_r->arm_insn, | |
10993 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
10994 | return -1; | |
10995 | } | |
10996 | else if(8 == bits (arm_insn_r->arm_insn, 4, 7) | |
10997 | || 10 == bits (arm_insn_r->arm_insn, 4, 7) | |
10998 | || 12 == bits (arm_insn_r->arm_insn, 4, 7) | |
10999 | || 14 == bits (arm_insn_r->arm_insn, 4, 7) | |
11000 | ) | |
11001 | { | |
11002 | if (0 == insn_op1 || 1 == insn_op1) | |
11003 | { | |
11004 | /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */ | |
11005 | /* We dont do optimization for SMULW<y> where we | |
11006 | need only Rd. */ | |
11007 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11008 | record_buf[1] = ARM_PS_REGNUM; | |
11009 | arm_insn_r->reg_rec_count = 2; | |
11010 | } | |
11011 | else if (2 == insn_op1) | |
11012 | { | |
11013 | /* SMLAL<x><y>. */ | |
11014 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11015 | record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19); | |
11016 | arm_insn_r->reg_rec_count = 2; | |
11017 | } | |
11018 | else if (3 == insn_op1) | |
11019 | { | |
11020 | /* SMUL<x><y>. */ | |
11021 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11022 | arm_insn_r->reg_rec_count = 1; | |
11023 | } | |
11024 | } | |
11025 | } | |
11026 | else | |
11027 | { | |
11028 | /* MSR : immediate form. */ | |
11029 | if (1 == insn_op1) | |
11030 | { | |
11031 | /* CSPR is going to be changed. */ | |
11032 | record_buf[0] = ARM_PS_REGNUM; | |
11033 | arm_insn_r->reg_rec_count = 1; | |
11034 | } | |
11035 | else if (3 == insn_op1) | |
11036 | { | |
11037 | /* SPSR is going to be changed. */ | |
11038 | /* we need to get SPSR value, which is yet to be done */ | |
11039 | printf_unfiltered (_("Process record does not support " | |
11040 | "instruction 0x%0x at address %s.\n"), | |
11041 | arm_insn_r->arm_insn, | |
11042 | paddress (arm_insn_r->gdbarch, | |
11043 | arm_insn_r->this_addr)); | |
11044 | return -1; | |
11045 | } | |
11046 | } | |
11047 | } | |
11048 | ||
11049 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); | |
11050 | opcode2 = bits (arm_insn_r->arm_insn, 20, 24); | |
11051 | insn_op1 = bits (arm_insn_r->arm_insn, 5, 6); | |
11052 | ||
11053 | /* Handle load/store insn extension space. */ | |
11054 | ||
11055 | if (!opcode1 && bit (arm_insn_r->arm_insn, 7) | |
11056 | && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond | |
11057 | && !INSN_RECORDED(arm_insn_r)) | |
11058 | { | |
11059 | /* SWP/SWPB. */ | |
11060 | if (0 == insn_op1) | |
11061 | { | |
11062 | /* These insn, changes register and memory as well. */ | |
11063 | /* SWP or SWPB insn. */ | |
11064 | /* Get memory address given by Rn. */ | |
11065 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11066 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11067 | /* SWP insn ?, swaps word. */ | |
11068 | if (8 == arm_insn_r->opcode) | |
11069 | { | |
11070 | record_buf_mem[0] = 4; | |
11071 | } | |
11072 | else | |
11073 | { | |
11074 | /* SWPB insn, swaps only byte. */ | |
11075 | record_buf_mem[0] = 1; | |
11076 | } | |
11077 | record_buf_mem[1] = u_regval; | |
11078 | arm_insn_r->mem_rec_count = 1; | |
11079 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11080 | arm_insn_r->reg_rec_count = 1; | |
11081 | } | |
11082 | else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11083 | { | |
11084 | /* STRH. */ | |
11085 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11086 | ARM_RECORD_STRH); | |
11087 | } | |
11088 | else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11089 | { | |
11090 | /* LDRD. */ | |
11091 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11092 | record_buf[1] = record_buf[0] + 1; | |
11093 | arm_insn_r->reg_rec_count = 2; | |
11094 | } | |
11095 | else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) | |
11096 | { | |
11097 | /* STRD. */ | |
11098 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11099 | ARM_RECORD_STRD); | |
11100 | } | |
11101 | else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3) | |
11102 | { | |
11103 | /* LDRH, LDRSB, LDRSH. */ | |
11104 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11105 | arm_insn_r->reg_rec_count = 1; | |
11106 | } | |
11107 | ||
11108 | } | |
11109 | ||
11110 | opcode1 = bits (arm_insn_r->arm_insn, 23, 27); | |
11111 | if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21) | |
11112 | && !INSN_RECORDED(arm_insn_r)) | |
11113 | { | |
11114 | ret = -1; | |
11115 | /* Handle coprocessor insn extension space. */ | |
11116 | } | |
11117 | ||
11118 | /* To be done for ARMv5 and later; as of now we return -1. */ | |
11119 | if (-1 == ret) | |
11120 | printf_unfiltered (_("Process record does not support instruction x%0x " | |
11121 | "at address %s.\n"),arm_insn_r->arm_insn, | |
11122 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11123 | ||
11124 | ||
11125 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11126 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11127 | ||
11128 | return ret; | |
11129 | } | |
11130 | ||
11131 | /* Handling opcode 000 insns. */ | |
11132 | ||
11133 | static int | |
11134 | arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r) | |
11135 | { | |
11136 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11137 | uint32_t record_buf[8], record_buf_mem[8]; | |
11138 | ULONGEST u_regval[2] = {0}; | |
11139 | ||
11140 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
11141 | uint32_t immed_high = 0, immed_low = 0, offset_8 = 0, tgt_mem_addr = 0; | |
11142 | uint32_t opcode1 = 0; | |
11143 | ||
11144 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11145 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11146 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); | |
11147 | ||
11148 | /* Data processing insn /multiply insn. */ | |
11149 | if (9 == arm_insn_r->decode | |
11150 | && ((4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
11151 | || (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode))) | |
11152 | { | |
11153 | /* Handle multiply instructions. */ | |
11154 | /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */ | |
11155 | if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode) | |
11156 | { | |
11157 | /* Handle MLA and MUL. */ | |
11158 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
11159 | record_buf[1] = ARM_PS_REGNUM; | |
11160 | arm_insn_r->reg_rec_count = 2; | |
11161 | } | |
11162 | else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) | |
11163 | { | |
11164 | /* Handle SMLAL, SMULL, UMLAL, UMULL. */ | |
11165 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); | |
11166 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); | |
11167 | record_buf[2] = ARM_PS_REGNUM; | |
11168 | arm_insn_r->reg_rec_count = 3; | |
11169 | } | |
11170 | } | |
11171 | else if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
11172 | && (11 == arm_insn_r->decode || 13 == arm_insn_r->decode)) | |
11173 | { | |
11174 | /* Handle misc load insns, as 20th bit (L = 1). */ | |
11175 | /* LDR insn has a capability to do branching, if | |
11176 | MOV LR, PC is precceded by LDR insn having Rn as R15 | |
11177 | in that case, it emulates branch and link insn, and hence we | |
11178 | need to save CSPR and PC as well. I am not sure this is right | |
11179 | place; as opcode = 010 LDR insn make this happen, if R15 was | |
11180 | used. */ | |
11181 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11182 | if (15 != reg_dest) | |
11183 | { | |
11184 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11185 | arm_insn_r->reg_rec_count = 1; | |
11186 | } | |
11187 | else | |
11188 | { | |
11189 | record_buf[0] = reg_dest; | |
11190 | record_buf[1] = ARM_PS_REGNUM; | |
11191 | arm_insn_r->reg_rec_count = 2; | |
11192 | } | |
11193 | } | |
11194 | else if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
11195 | && sbo_sbz (arm_insn_r->arm_insn, 5, 12, 0) | |
11196 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
11197 | && 2 == bits (arm_insn_r->arm_insn, 20, 21)) | |
11198 | { | |
11199 | /* Handle MSR insn. */ | |
11200 | if (9 == arm_insn_r->opcode) | |
11201 | { | |
11202 | /* CSPR is going to be changed. */ | |
11203 | record_buf[0] = ARM_PS_REGNUM; | |
11204 | arm_insn_r->reg_rec_count = 1; | |
11205 | } | |
11206 | else | |
11207 | { | |
11208 | /* SPSR is going to be changed. */ | |
11209 | /* How to read SPSR value? */ | |
11210 | printf_unfiltered (_("Process record does not support instruction " | |
11211 | "0x%0x at address %s.\n"), | |
11212 | arm_insn_r->arm_insn, | |
11213 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11214 | return -1; | |
11215 | } | |
11216 | } | |
11217 | else if (9 == arm_insn_r->decode | |
11218 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
11219 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11220 | { | |
11221 | /* Handling SWP, SWPB. */ | |
11222 | /* These insn, changes register and memory as well. */ | |
11223 | /* SWP or SWPB insn. */ | |
11224 | ||
11225 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11226 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11227 | /* SWP insn ?, swaps word. */ | |
11228 | if (8 == arm_insn_r->opcode) | |
11229 | { | |
11230 | record_buf_mem[0] = 4; | |
11231 | } | |
11232 | else | |
11233 | { | |
11234 | /* SWPB insn, swaps only byte. */ | |
11235 | record_buf_mem[0] = 1; | |
11236 | } | |
11237 | record_buf_mem[1] = u_regval[0]; | |
11238 | arm_insn_r->mem_rec_count = 1; | |
11239 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11240 | arm_insn_r->reg_rec_count = 1; | |
11241 | } | |
11242 | else if (3 == arm_insn_r->decode && 0x12 == opcode1 | |
11243 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
11244 | { | |
11245 | /* Handle BLX, branch and link/exchange. */ | |
11246 | if (9 == arm_insn_r->opcode) | |
11247 | { | |
11248 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm, | |
11249 | and R14 stores the return address. */ | |
11250 | record_buf[0] = ARM_PS_REGNUM; | |
11251 | record_buf[1] = ARM_LR_REGNUM; | |
11252 | arm_insn_r->reg_rec_count = 2; | |
11253 | } | |
11254 | } | |
11255 | else if (7 == arm_insn_r->decode && 0x12 == opcode1) | |
11256 | { | |
11257 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
11258 | /* CPSR is changed to be executed in ARM state, disabling normal | |
11259 | interrupts, entering abort mode. */ | |
11260 | /* According to high vector configuration PC is set. */ | |
11261 | /* user hit breakpoint and type reverse, in | |
11262 | that case, we need to go back with previous CPSR and | |
11263 | Program Counter. */ | |
11264 | record_buf[0] = ARM_PS_REGNUM; | |
11265 | record_buf[1] = ARM_LR_REGNUM; | |
11266 | arm_insn_r->reg_rec_count = 2; | |
11267 | ||
11268 | /* Save SPSR also; how? */ | |
11269 | printf_unfiltered (_("Process record does not support instruction " | |
11270 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11271 | paddress (arm_insn_r->gdbarch, | |
11272 | arm_insn_r->this_addr)); | |
11273 | return -1; | |
11274 | } | |
11275 | else if (11 == arm_insn_r->decode | |
11276 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11277 | { | |
11278 | /* Handle enhanced store insns and DSP insns (e.g. LDRD). */ | |
11279 | ||
11280 | /* Handle str(x) insn */ | |
11281 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], | |
11282 | ARM_RECORD_STRH); | |
11283 | } | |
11284 | else if (1 == arm_insn_r->decode && 0x12 == opcode1 | |
11285 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) | |
11286 | { | |
11287 | /* Handle BX, branch and link/exchange. */ | |
11288 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */ | |
11289 | record_buf[0] = ARM_PS_REGNUM; | |
11290 | arm_insn_r->reg_rec_count = 1; | |
11291 | } | |
11292 | else if (1 == arm_insn_r->decode && 0x16 == opcode1 | |
11293 | && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1) | |
11294 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)) | |
11295 | { | |
11296 | /* Count leading zeros: CLZ. */ | |
11297 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11298 | arm_insn_r->reg_rec_count = 1; | |
11299 | } | |
11300 | else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) | |
11301 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) | |
11302 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1) | |
11303 | && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0) | |
11304 | ) | |
11305 | { | |
11306 | /* Handle MRS insn. */ | |
11307 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11308 | arm_insn_r->reg_rec_count = 1; | |
11309 | } | |
11310 | else if (arm_insn_r->opcode <= 15) | |
11311 | { | |
11312 | /* Normal data processing insns. */ | |
11313 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
11314 | register, which is specified by 13-16 decode. */ | |
11315 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11316 | record_buf[1] = ARM_PS_REGNUM; | |
11317 | arm_insn_r->reg_rec_count = 2; | |
11318 | } | |
11319 | else | |
11320 | { | |
11321 | return -1; | |
11322 | } | |
11323 | ||
11324 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11325 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11326 | return 0; | |
11327 | } | |
11328 | ||
11329 | /* Handling opcode 001 insns. */ | |
11330 | ||
11331 | static int | |
11332 | arm_record_data_proc_imm (insn_decode_record *arm_insn_r) | |
11333 | { | |
11334 | uint32_t record_buf[8], record_buf_mem[8]; | |
11335 | ||
11336 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11337 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11338 | ||
11339 | if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) | |
11340 | && 2 == bits (arm_insn_r->arm_insn, 20, 21) | |
11341 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) | |
11342 | ) | |
11343 | { | |
11344 | /* Handle MSR insn. */ | |
11345 | if (9 == arm_insn_r->opcode) | |
11346 | { | |
11347 | /* CSPR is going to be changed. */ | |
11348 | record_buf[0] = ARM_PS_REGNUM; | |
11349 | arm_insn_r->reg_rec_count = 1; | |
11350 | } | |
11351 | else | |
11352 | { | |
11353 | /* SPSR is going to be changed. */ | |
11354 | } | |
11355 | } | |
11356 | else if (arm_insn_r->opcode <= 15) | |
11357 | { | |
11358 | /* Normal data processing insns. */ | |
11359 | /* Out of 11 shifter operands mode, all the insn modifies destination | |
11360 | register, which is specified by 13-16 decode. */ | |
11361 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11362 | record_buf[1] = ARM_PS_REGNUM; | |
11363 | arm_insn_r->reg_rec_count = 2; | |
11364 | } | |
11365 | else | |
11366 | { | |
11367 | return -1; | |
11368 | } | |
11369 | ||
11370 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11371 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11372 | return 0; | |
11373 | } | |
11374 | ||
11375 | /* Handling opcode 010 insns. */ | |
11376 | ||
11377 | static int | |
11378 | arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r) | |
11379 | { | |
11380 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11381 | ||
11382 | uint32_t reg_src1 = 0 , reg_dest = 0; | |
11383 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
11384 | uint32_t record_buf[8], record_buf_mem[8]; | |
11385 | ||
11386 | ULONGEST u_regval = 0; | |
11387 | ||
11388 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11389 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11390 | ||
11391 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11392 | { | |
11393 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11394 | /* LDR insn has a capability to do branching, if | |
11395 | MOV LR, PC is precedded by LDR insn having Rn as R15 | |
11396 | in that case, it emulates branch and link insn, and hence we | |
11397 | need to save CSPR and PC as well. */ | |
11398 | if (ARM_PC_REGNUM != reg_dest) | |
11399 | { | |
11400 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11401 | arm_insn_r->reg_rec_count = 1; | |
11402 | } | |
11403 | else | |
11404 | { | |
11405 | record_buf[0] = reg_dest; | |
11406 | record_buf[1] = ARM_PS_REGNUM; | |
11407 | arm_insn_r->reg_rec_count = 2; | |
11408 | } | |
11409 | } | |
11410 | else | |
11411 | { | |
11412 | /* Store, immediate offset, immediate pre-indexed, | |
11413 | immediate post-indexed. */ | |
11414 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11415 | offset_12 = bits (arm_insn_r->arm_insn, 0, 11); | |
11416 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
11417 | /* U == 1 */ | |
11418 | if (bit (arm_insn_r->arm_insn, 23)) | |
11419 | { | |
11420 | tgt_mem_addr = u_regval + offset_12; | |
11421 | } | |
11422 | else | |
11423 | { | |
11424 | tgt_mem_addr = u_regval - offset_12; | |
11425 | } | |
11426 | ||
11427 | switch (arm_insn_r->opcode) | |
11428 | { | |
11429 | /* STR. */ | |
11430 | case 8: | |
11431 | case 12: | |
11432 | /* STR. */ | |
11433 | case 9: | |
11434 | case 13: | |
11435 | /* STRT. */ | |
11436 | case 1: | |
11437 | case 5: | |
11438 | /* STR. */ | |
11439 | case 4: | |
11440 | case 0: | |
11441 | record_buf_mem[0] = 4; | |
11442 | break; | |
11443 | ||
11444 | /* STRB. */ | |
11445 | case 10: | |
11446 | case 14: | |
11447 | /* STRB. */ | |
11448 | case 11: | |
11449 | case 15: | |
11450 | /* STRBT. */ | |
11451 | case 3: | |
11452 | case 7: | |
11453 | /* STRB. */ | |
11454 | case 2: | |
11455 | case 6: | |
11456 | record_buf_mem[0] = 1; | |
11457 | break; | |
11458 | ||
11459 | default: | |
11460 | gdb_assert_not_reached ("no decoding pattern found"); | |
11461 | break; | |
11462 | } | |
11463 | record_buf_mem[1] = tgt_mem_addr; | |
11464 | arm_insn_r->mem_rec_count = 1; | |
11465 | ||
11466 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11467 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11468 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11469 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11470 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11471 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11472 | ) | |
11473 | { | |
11474 | /* We are handling pre-indexed mode; post-indexed mode; | |
11475 | where Rn is going to be changed. */ | |
11476 | record_buf[0] = reg_src1; | |
11477 | arm_insn_r->reg_rec_count = 1; | |
11478 | } | |
11479 | } | |
11480 | ||
11481 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11482 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11483 | return 0; | |
11484 | } | |
11485 | ||
11486 | /* Handling opcode 011 insns. */ | |
11487 | ||
11488 | static int | |
11489 | arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r) | |
11490 | { | |
11491 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11492 | ||
11493 | uint32_t shift_imm = 0; | |
11494 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; | |
11495 | uint32_t offset_12 = 0, tgt_mem_addr = 0; | |
11496 | uint32_t record_buf[8], record_buf_mem[8]; | |
11497 | ||
11498 | LONGEST s_word; | |
11499 | ULONGEST u_regval[2]; | |
11500 | ||
11501 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); | |
11502 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); | |
11503 | ||
11504 | /* Handle enhanced store insns and LDRD DSP insn, | |
11505 | order begins according to addressing modes for store insns | |
11506 | STRH insn. */ | |
11507 | ||
11508 | /* LDR or STR? */ | |
11509 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11510 | { | |
11511 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); | |
11512 | /* LDR insn has a capability to do branching, if | |
11513 | MOV LR, PC is precedded by LDR insn having Rn as R15 | |
11514 | in that case, it emulates branch and link insn, and hence we | |
11515 | need to save CSPR and PC as well. */ | |
11516 | if (15 != reg_dest) | |
11517 | { | |
11518 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); | |
11519 | arm_insn_r->reg_rec_count = 1; | |
11520 | } | |
11521 | else | |
11522 | { | |
11523 | record_buf[0] = reg_dest; | |
11524 | record_buf[1] = ARM_PS_REGNUM; | |
11525 | arm_insn_r->reg_rec_count = 2; | |
11526 | } | |
11527 | } | |
11528 | else | |
11529 | { | |
11530 | if (! bits (arm_insn_r->arm_insn, 4, 11)) | |
11531 | { | |
11532 | /* Store insn, register offset and register pre-indexed, | |
11533 | register post-indexed. */ | |
11534 | /* Get Rm. */ | |
11535 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
11536 | /* Get Rn. */ | |
11537 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11538 | regcache_raw_read_unsigned (reg_cache, reg_src1 | |
11539 | , &u_regval[0]); | |
11540 | regcache_raw_read_unsigned (reg_cache, reg_src2 | |
11541 | , &u_regval[1]); | |
11542 | if (15 == reg_src2) | |
11543 | { | |
11544 | /* If R15 was used as Rn, hence current PC+8. */ | |
11545 | /* Pre-indexed mode doesnt reach here ; illegal insn. */ | |
11546 | u_regval[0] = u_regval[0] + 8; | |
11547 | } | |
11548 | /* Calculate target store address, Rn +/- Rm, register offset. */ | |
11549 | /* U == 1. */ | |
11550 | if (bit (arm_insn_r->arm_insn, 23)) | |
11551 | { | |
11552 | tgt_mem_addr = u_regval[0] + u_regval[1]; | |
11553 | } | |
11554 | else | |
11555 | { | |
11556 | tgt_mem_addr = u_regval[1] - u_regval[0]; | |
11557 | } | |
11558 | ||
11559 | switch (arm_insn_r->opcode) | |
11560 | { | |
11561 | /* STR. */ | |
11562 | case 8: | |
11563 | case 12: | |
11564 | /* STR. */ | |
11565 | case 9: | |
11566 | case 13: | |
11567 | /* STRT. */ | |
11568 | case 1: | |
11569 | case 5: | |
11570 | /* STR. */ | |
11571 | case 0: | |
11572 | case 4: | |
11573 | record_buf_mem[0] = 4; | |
11574 | break; | |
11575 | ||
11576 | /* STRB. */ | |
11577 | case 10: | |
11578 | case 14: | |
11579 | /* STRB. */ | |
11580 | case 11: | |
11581 | case 15: | |
11582 | /* STRBT. */ | |
11583 | case 3: | |
11584 | case 7: | |
11585 | /* STRB. */ | |
11586 | case 2: | |
11587 | case 6: | |
11588 | record_buf_mem[0] = 1; | |
11589 | break; | |
11590 | ||
11591 | default: | |
11592 | gdb_assert_not_reached ("no decoding pattern found"); | |
11593 | break; | |
11594 | } | |
11595 | record_buf_mem[1] = tgt_mem_addr; | |
11596 | arm_insn_r->mem_rec_count = 1; | |
11597 | ||
11598 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11599 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11600 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11601 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11602 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11603 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11604 | ) | |
11605 | { | |
11606 | /* Rn is going to be changed in pre-indexed mode and | |
11607 | post-indexed mode as well. */ | |
11608 | record_buf[0] = reg_src2; | |
11609 | arm_insn_r->reg_rec_count = 1; | |
11610 | } | |
11611 | } | |
11612 | else | |
11613 | { | |
11614 | /* Store insn, scaled register offset; scaled pre-indexed. */ | |
11615 | offset_12 = bits (arm_insn_r->arm_insn, 5, 6); | |
11616 | /* Get Rm. */ | |
11617 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); | |
11618 | /* Get Rn. */ | |
11619 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); | |
11620 | /* Get shift_imm. */ | |
11621 | shift_imm = bits (arm_insn_r->arm_insn, 7, 11); | |
11622 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11623 | regcache_raw_read_signed (reg_cache, reg_src1, &s_word); | |
11624 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
11625 | /* Offset_12 used as shift. */ | |
11626 | switch (offset_12) | |
11627 | { | |
11628 | case 0: | |
11629 | /* Offset_12 used as index. */ | |
11630 | offset_12 = u_regval[0] << shift_imm; | |
11631 | break; | |
11632 | ||
11633 | case 1: | |
11634 | offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm; | |
11635 | break; | |
11636 | ||
11637 | case 2: | |
11638 | if (!shift_imm) | |
11639 | { | |
11640 | if (bit (u_regval[0], 31)) | |
11641 | { | |
11642 | offset_12 = 0xFFFFFFFF; | |
11643 | } | |
11644 | else | |
11645 | { | |
11646 | offset_12 = 0; | |
11647 | } | |
11648 | } | |
11649 | else | |
11650 | { | |
11651 | /* This is arithmetic shift. */ | |
11652 | offset_12 = s_word >> shift_imm; | |
11653 | } | |
11654 | break; | |
11655 | ||
11656 | case 3: | |
11657 | if (!shift_imm) | |
11658 | { | |
11659 | regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM, | |
11660 | &u_regval[1]); | |
11661 | /* Get C flag value and shift it by 31. */ | |
11662 | offset_12 = (((bit (u_regval[1], 29)) << 31) \ | |
11663 | | (u_regval[0]) >> 1); | |
11664 | } | |
11665 | else | |
11666 | { | |
11667 | offset_12 = (u_regval[0] >> shift_imm) \ | |
11668 | | (u_regval[0] << | |
11669 | (sizeof(uint32_t) - shift_imm)); | |
11670 | } | |
11671 | break; | |
11672 | ||
11673 | default: | |
11674 | gdb_assert_not_reached ("no decoding pattern found"); | |
11675 | break; | |
11676 | } | |
11677 | ||
11678 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
11679 | /* bit U set. */ | |
11680 | if (bit (arm_insn_r->arm_insn, 23)) | |
11681 | { | |
11682 | tgt_mem_addr = u_regval[1] + offset_12; | |
11683 | } | |
11684 | else | |
11685 | { | |
11686 | tgt_mem_addr = u_regval[1] - offset_12; | |
11687 | } | |
11688 | ||
11689 | switch (arm_insn_r->opcode) | |
11690 | { | |
11691 | /* STR. */ | |
11692 | case 8: | |
11693 | case 12: | |
11694 | /* STR. */ | |
11695 | case 9: | |
11696 | case 13: | |
11697 | /* STRT. */ | |
11698 | case 1: | |
11699 | case 5: | |
11700 | /* STR. */ | |
11701 | case 0: | |
11702 | case 4: | |
11703 | record_buf_mem[0] = 4; | |
11704 | break; | |
11705 | ||
11706 | /* STRB. */ | |
11707 | case 10: | |
11708 | case 14: | |
11709 | /* STRB. */ | |
11710 | case 11: | |
11711 | case 15: | |
11712 | /* STRBT. */ | |
11713 | case 3: | |
11714 | case 7: | |
11715 | /* STRB. */ | |
11716 | case 2: | |
11717 | case 6: | |
11718 | record_buf_mem[0] = 1; | |
11719 | break; | |
11720 | ||
11721 | default: | |
11722 | gdb_assert_not_reached ("no decoding pattern found"); | |
11723 | break; | |
11724 | } | |
11725 | record_buf_mem[1] = tgt_mem_addr; | |
11726 | arm_insn_r->mem_rec_count = 1; | |
11727 | ||
11728 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode | |
11729 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode | |
11730 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode | |
11731 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode | |
11732 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode | |
11733 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode | |
11734 | ) | |
11735 | { | |
11736 | /* Rn is going to be changed in register scaled pre-indexed | |
11737 | mode,and scaled post indexed mode. */ | |
11738 | record_buf[0] = reg_src2; | |
11739 | arm_insn_r->reg_rec_count = 1; | |
11740 | } | |
11741 | } | |
11742 | } | |
11743 | ||
11744 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11745 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11746 | return 0; | |
11747 | } | |
11748 | ||
11749 | /* Handling opcode 100 insns. */ | |
11750 | ||
11751 | static int | |
11752 | arm_record_ld_st_multiple (insn_decode_record *arm_insn_r) | |
11753 | { | |
11754 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11755 | ||
11756 | uint32_t register_list[16] = {0}, register_count = 0, register_bits = 0; | |
11757 | uint32_t reg_src1 = 0, addr_mode = 0, no_of_regs = 0; | |
11758 | uint32_t start_address = 0, index = 0; | |
11759 | uint32_t record_buf[24], record_buf_mem[48]; | |
11760 | ||
11761 | ULONGEST u_regval[2] = {0}; | |
11762 | ||
11763 | /* This mode is exclusively for load and store multiple. */ | |
11764 | /* Handle incremenrt after/before and decrment after.before mode; | |
11765 | Rn is changing depending on W bit, but as of now we store Rn too | |
11766 | without optimization. */ | |
11767 | ||
11768 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) | |
11769 | { | |
11770 | /* LDM (1,2,3) where LDM (3) changes CPSR too. */ | |
11771 | ||
11772 | if (bit (arm_insn_r->arm_insn, 20) && !bit (arm_insn_r->arm_insn, 22)) | |
11773 | { | |
11774 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11775 | no_of_regs = 15; | |
11776 | } | |
11777 | else | |
11778 | { | |
11779 | register_bits = bits (arm_insn_r->arm_insn, 0, 14); | |
11780 | no_of_regs = 14; | |
11781 | } | |
11782 | /* Get Rn. */ | |
11783 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11784 | while (register_bits) | |
11785 | { | |
11786 | if (register_bits & 0x00000001) | |
11787 | register_list[register_count++] = 1; | |
11788 | register_bits = register_bits >> 1; | |
11789 | } | |
11790 | ||
11791 | /* Extra space for Base Register and CPSR; wihtout optimization. */ | |
11792 | record_buf[register_count] = reg_src1; | |
11793 | record_buf[register_count + 1] = ARM_PS_REGNUM; | |
11794 | arm_insn_r->reg_rec_count = register_count + 2; | |
11795 | ||
11796 | for (register_count = 0; register_count < no_of_regs; register_count++) | |
11797 | { | |
11798 | if (register_list[register_count]) | |
11799 | { | |
11800 | /* Register_count gives total no of registers | |
11801 | and dually working as reg number. */ | |
11802 | record_buf[index] = register_count; | |
11803 | index++; | |
11804 | } | |
11805 | } | |
11806 | ||
11807 | } | |
11808 | else | |
11809 | { | |
11810 | /* It handles both STM(1) and STM(2). */ | |
11811 | addr_mode = bits (arm_insn_r->arm_insn, 23, 24); | |
11812 | ||
11813 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); | |
11814 | /* Get Rn. */ | |
11815 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); | |
11816 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
11817 | while (register_bits) | |
11818 | { | |
11819 | if (register_bits & 0x00000001) | |
11820 | register_count++; | |
11821 | register_bits = register_bits >> 1; | |
11822 | } | |
11823 | ||
11824 | switch (addr_mode) | |
11825 | { | |
11826 | /* Decrement after. */ | |
11827 | case 0: | |
11828 | start_address = (u_regval[0]) - (register_count * 4) + 4; | |
11829 | arm_insn_r->mem_rec_count = register_count; | |
11830 | while (register_count) | |
11831 | { | |
11832 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11833 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11834 | start_address = start_address + 4; | |
11835 | register_count--; | |
11836 | } | |
11837 | break; | |
11838 | ||
11839 | /* Increment after. */ | |
11840 | case 1: | |
11841 | start_address = u_regval[0]; | |
11842 | arm_insn_r->mem_rec_count = register_count; | |
11843 | while (register_count) | |
11844 | { | |
11845 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11846 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11847 | start_address = start_address + 4; | |
11848 | register_count--; | |
11849 | } | |
11850 | break; | |
11851 | ||
11852 | /* Decrement before. */ | |
11853 | case 2: | |
11854 | ||
11855 | start_address = (u_regval[0]) - (register_count * 4); | |
11856 | arm_insn_r->mem_rec_count = register_count; | |
11857 | while (register_count) | |
11858 | { | |
11859 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11860 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11861 | start_address = start_address + 4; | |
11862 | register_count--; | |
11863 | } | |
11864 | break; | |
11865 | ||
11866 | /* Increment before. */ | |
11867 | case 3: | |
11868 | start_address = u_regval[0] + 4; | |
11869 | arm_insn_r->mem_rec_count = register_count; | |
11870 | while (register_count) | |
11871 | { | |
11872 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
11873 | record_buf_mem[(register_count * 2) - 2] = 4; | |
11874 | start_address = start_address + 4; | |
11875 | register_count--; | |
11876 | } | |
11877 | break; | |
11878 | ||
11879 | default: | |
11880 | gdb_assert_not_reached ("no decoding pattern found"); | |
11881 | break; | |
11882 | } | |
11883 | ||
11884 | /* Base register also changes; based on condition and W bit. */ | |
11885 | /* We save it anyway without optimization. */ | |
11886 | record_buf[0] = reg_src1; | |
11887 | arm_insn_r->reg_rec_count = 1; | |
11888 | } | |
11889 | ||
11890 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11891 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); | |
11892 | return 0; | |
11893 | } | |
11894 | ||
11895 | /* Handling opcode 101 insns. */ | |
11896 | ||
11897 | static int | |
11898 | arm_record_b_bl (insn_decode_record *arm_insn_r) | |
11899 | { | |
11900 | uint32_t record_buf[8]; | |
11901 | ||
11902 | /* Handle B, BL, BLX(1) insns. */ | |
11903 | /* B simply branches so we do nothing here. */ | |
11904 | /* Note: BLX(1) doesnt fall here but instead it falls into | |
11905 | extension space. */ | |
11906 | if (bit (arm_insn_r->arm_insn, 24)) | |
11907 | { | |
11908 | record_buf[0] = ARM_LR_REGNUM; | |
11909 | arm_insn_r->reg_rec_count = 1; | |
11910 | } | |
11911 | ||
11912 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); | |
11913 | ||
11914 | return 0; | |
11915 | } | |
11916 | ||
11917 | /* Handling opcode 110 insns. */ | |
11918 | ||
11919 | static int | |
11920 | arm_record_coproc (insn_decode_record *arm_insn_r) | |
11921 | { | |
11922 | printf_unfiltered (_("Process record does not support instruction " | |
11923 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11924 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11925 | ||
11926 | return -1; | |
11927 | } | |
11928 | ||
11929 | /* Handling opcode 111 insns. */ | |
11930 | ||
11931 | static int | |
11932 | arm_record_coproc_data_proc (insn_decode_record *arm_insn_r) | |
11933 | { | |
11934 | struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch); | |
11935 | struct regcache *reg_cache = arm_insn_r->regcache; | |
11936 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
11937 | ||
11938 | /* Handle SWI insn; system call would be handled over here. */ | |
11939 | ||
11940 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27); | |
11941 | if (15 == arm_insn_r->opcode) | |
11942 | { | |
11943 | /* Handle arm syscall insn. */ | |
11944 | if (tdep->arm_swi_record != NULL) | |
11945 | { | |
11946 | ret = tdep->arm_swi_record(reg_cache); | |
11947 | } | |
11948 | else | |
11949 | { | |
11950 | printf_unfiltered (_("no syscall record support\n")); | |
11951 | ret = -1; | |
11952 | } | |
11953 | } | |
11954 | ||
11955 | printf_unfiltered (_("Process record does not support instruction " | |
11956 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, | |
11957 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); | |
11958 | return ret; | |
11959 | } | |
11960 | ||
11961 | /* Handling opcode 000 insns. */ | |
11962 | ||
11963 | static int | |
11964 | thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r) | |
11965 | { | |
11966 | uint32_t record_buf[8]; | |
11967 | uint32_t reg_src1 = 0; | |
11968 | ||
11969 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
11970 | ||
11971 | record_buf[0] = ARM_PS_REGNUM; | |
11972 | record_buf[1] = reg_src1; | |
11973 | thumb_insn_r->reg_rec_count = 2; | |
11974 | ||
11975 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11976 | ||
11977 | return 0; | |
11978 | } | |
11979 | ||
11980 | ||
11981 | /* Handling opcode 001 insns. */ | |
11982 | ||
11983 | static int | |
11984 | thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r) | |
11985 | { | |
11986 | uint32_t record_buf[8]; | |
11987 | uint32_t reg_src1 = 0; | |
11988 | ||
11989 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
11990 | ||
11991 | record_buf[0] = ARM_PS_REGNUM; | |
11992 | record_buf[1] = reg_src1; | |
11993 | thumb_insn_r->reg_rec_count = 2; | |
11994 | ||
11995 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
11996 | ||
11997 | return 0; | |
11998 | } | |
11999 | ||
12000 | /* Handling opcode 010 insns. */ | |
12001 | ||
12002 | static int | |
12003 | thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r) | |
12004 | { | |
12005 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12006 | uint32_t record_buf[8], record_buf_mem[8]; | |
12007 | ||
12008 | uint32_t reg_src1 = 0, reg_src2 = 0; | |
12009 | uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0; | |
12010 | ||
12011 | ULONGEST u_regval[2] = {0}; | |
12012 | ||
12013 | opcode1 = bits (thumb_insn_r->arm_insn, 10, 12); | |
12014 | ||
12015 | if (bit (thumb_insn_r->arm_insn, 12)) | |
12016 | { | |
12017 | /* Handle load/store register offset. */ | |
12018 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 10); | |
12019 | if (opcode2 >= 12 && opcode2 <= 15) | |
12020 | { | |
12021 | /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */ | |
12022 | reg_src1 = bits (thumb_insn_r->arm_insn,0, 2); | |
12023 | record_buf[0] = reg_src1; | |
12024 | thumb_insn_r->reg_rec_count = 1; | |
12025 | } | |
12026 | else if (opcode2 >= 8 && opcode2 <= 10) | |
12027 | { | |
12028 | /* STR(2), STRB(2), STRH(2) . */ | |
12029 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12030 | reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8); | |
12031 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); | |
12032 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); | |
12033 | if (8 == opcode2) | |
12034 | record_buf_mem[0] = 4; /* STR (2). */ | |
12035 | else if (10 == opcode2) | |
12036 | record_buf_mem[0] = 1; /* STRB (2). */ | |
12037 | else if (9 == opcode2) | |
12038 | record_buf_mem[0] = 2; /* STRH (2). */ | |
12039 | record_buf_mem[1] = u_regval[0] + u_regval[1]; | |
12040 | thumb_insn_r->mem_rec_count = 1; | |
12041 | } | |
12042 | } | |
12043 | else if (bit (thumb_insn_r->arm_insn, 11)) | |
12044 | { | |
12045 | /* Handle load from literal pool. */ | |
12046 | /* LDR(3). */ | |
12047 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12048 | record_buf[0] = reg_src1; | |
12049 | thumb_insn_r->reg_rec_count = 1; | |
12050 | } | |
12051 | else if (opcode1) | |
12052 | { | |
12053 | opcode2 = bits (thumb_insn_r->arm_insn, 8, 9); | |
12054 | opcode3 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12055 | if ((3 == opcode2) && (!opcode3)) | |
12056 | { | |
12057 | /* Branch with exchange. */ | |
12058 | record_buf[0] = ARM_PS_REGNUM; | |
12059 | thumb_insn_r->reg_rec_count = 1; | |
12060 | } | |
12061 | else | |
12062 | { | |
12063 | /* Format 8; special data processing insns. */ | |
12064 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12065 | record_buf[0] = ARM_PS_REGNUM; | |
12066 | record_buf[1] = reg_src1; | |
12067 | thumb_insn_r->reg_rec_count = 2; | |
12068 | } | |
12069 | } | |
12070 | else | |
12071 | { | |
12072 | /* Format 5; data processing insns. */ | |
12073 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12074 | if (bit (thumb_insn_r->arm_insn, 7)) | |
12075 | { | |
12076 | reg_src1 = reg_src1 + 8; | |
12077 | } | |
12078 | record_buf[0] = ARM_PS_REGNUM; | |
12079 | record_buf[1] = reg_src1; | |
12080 | thumb_insn_r->reg_rec_count = 2; | |
12081 | } | |
12082 | ||
12083 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12084 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12085 | record_buf_mem); | |
12086 | ||
12087 | return 0; | |
12088 | } | |
12089 | ||
12090 | /* Handling opcode 001 insns. */ | |
12091 | ||
12092 | static int | |
12093 | thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r) | |
12094 | { | |
12095 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12096 | uint32_t record_buf[8], record_buf_mem[8]; | |
12097 | ||
12098 | uint32_t reg_src1 = 0; | |
12099 | uint32_t opcode = 0, immed_5 = 0; | |
12100 | ||
12101 | ULONGEST u_regval = 0; | |
12102 | ||
12103 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12104 | ||
12105 | if (opcode) | |
12106 | { | |
12107 | /* LDR(1). */ | |
12108 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12109 | record_buf[0] = reg_src1; | |
12110 | thumb_insn_r->reg_rec_count = 1; | |
12111 | } | |
12112 | else | |
12113 | { | |
12114 | /* STR(1). */ | |
12115 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12116 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12117 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12118 | record_buf_mem[0] = 4; | |
12119 | record_buf_mem[1] = u_regval + (immed_5 * 4); | |
12120 | thumb_insn_r->mem_rec_count = 1; | |
12121 | } | |
12122 | ||
12123 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12124 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12125 | record_buf_mem); | |
12126 | ||
12127 | return 0; | |
12128 | } | |
12129 | ||
12130 | /* Handling opcode 100 insns. */ | |
12131 | ||
12132 | static int | |
12133 | thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r) | |
12134 | { | |
12135 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12136 | uint32_t record_buf[8], record_buf_mem[8]; | |
12137 | ||
12138 | uint32_t reg_src1 = 0; | |
12139 | uint32_t opcode = 0, immed_8 = 0, immed_5 = 0; | |
12140 | ||
12141 | ULONGEST u_regval = 0; | |
12142 | ||
12143 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12144 | ||
12145 | if (3 == opcode) | |
12146 | { | |
12147 | /* LDR(4). */ | |
12148 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12149 | record_buf[0] = reg_src1; | |
12150 | thumb_insn_r->reg_rec_count = 1; | |
12151 | } | |
12152 | else if (1 == opcode) | |
12153 | { | |
12154 | /* LDRH(1). */ | |
12155 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); | |
12156 | record_buf[0] = reg_src1; | |
12157 | thumb_insn_r->reg_rec_count = 1; | |
12158 | } | |
12159 | else if (2 == opcode) | |
12160 | { | |
12161 | /* STR(3). */ | |
12162 | immed_8 = bits (thumb_insn_r->arm_insn, 0, 7); | |
12163 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); | |
12164 | record_buf_mem[0] = 4; | |
12165 | record_buf_mem[1] = u_regval + (immed_8 * 4); | |
12166 | thumb_insn_r->mem_rec_count = 1; | |
12167 | } | |
12168 | else if (0 == opcode) | |
12169 | { | |
12170 | /* STRH(1). */ | |
12171 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); | |
12172 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); | |
12173 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12174 | record_buf_mem[0] = 2; | |
12175 | record_buf_mem[1] = u_regval + (immed_5 * 2); | |
12176 | thumb_insn_r->mem_rec_count = 1; | |
12177 | } | |
12178 | ||
12179 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12180 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12181 | record_buf_mem); | |
12182 | ||
12183 | return 0; | |
12184 | } | |
12185 | ||
12186 | /* Handling opcode 101 insns. */ | |
12187 | ||
12188 | static int | |
12189 | thumb_record_misc (insn_decode_record *thumb_insn_r) | |
12190 | { | |
12191 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12192 | ||
12193 | uint32_t opcode = 0, opcode1 = 0, opcode2 = 0; | |
12194 | uint32_t register_bits = 0, register_count = 0; | |
12195 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; | |
12196 | uint32_t record_buf[24], record_buf_mem[48]; | |
12197 | uint32_t reg_src1; | |
12198 | ||
12199 | ULONGEST u_regval = 0; | |
12200 | ||
12201 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); | |
12202 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12203 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 12); | |
12204 | ||
12205 | if (14 == opcode2) | |
12206 | { | |
12207 | /* POP. */ | |
12208 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12209 | while (register_bits) | |
12210 | { | |
12211 | if (register_bits & 0x00000001) | |
12212 | register_list[register_count++] = 1; | |
12213 | register_bits = register_bits >> 1; | |
12214 | } | |
12215 | record_buf[register_count] = ARM_PS_REGNUM; | |
12216 | record_buf[register_count + 1] = ARM_SP_REGNUM; | |
12217 | thumb_insn_r->reg_rec_count = register_count + 2; | |
12218 | for (register_count = 0; register_count < 8; register_count++) | |
12219 | { | |
12220 | if (register_list[register_count]) | |
12221 | { | |
12222 | record_buf[index] = register_count; | |
12223 | index++; | |
12224 | } | |
12225 | } | |
12226 | } | |
12227 | else if (10 == opcode2) | |
12228 | { | |
12229 | /* PUSH. */ | |
12230 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12231 | regcache_raw_read_unsigned (reg_cache, ARM_PC_REGNUM, &u_regval); | |
12232 | while (register_bits) | |
12233 | { | |
12234 | if (register_bits & 0x00000001) | |
12235 | register_count++; | |
12236 | register_bits = register_bits >> 1; | |
12237 | } | |
12238 | start_address = u_regval - \ | |
12239 | (4 * (bit (thumb_insn_r->arm_insn, 8) + register_count)); | |
12240 | thumb_insn_r->mem_rec_count = register_count; | |
12241 | while (register_count) | |
12242 | { | |
12243 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12244 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12245 | start_address = start_address + 4; | |
12246 | register_count--; | |
12247 | } | |
12248 | record_buf[0] = ARM_SP_REGNUM; | |
12249 | thumb_insn_r->reg_rec_count = 1; | |
12250 | } | |
12251 | else if (0x1E == opcode1) | |
12252 | { | |
12253 | /* BKPT insn. */ | |
12254 | /* Handle enhanced software breakpoint insn, BKPT. */ | |
12255 | /* CPSR is changed to be executed in ARM state, disabling normal | |
12256 | interrupts, entering abort mode. */ | |
12257 | /* According to high vector configuration PC is set. */ | |
12258 | /* User hits breakpoint and type reverse, in that case, we need to go back with | |
12259 | previous CPSR and Program Counter. */ | |
12260 | record_buf[0] = ARM_PS_REGNUM; | |
12261 | record_buf[1] = ARM_LR_REGNUM; | |
12262 | thumb_insn_r->reg_rec_count = 2; | |
12263 | /* We need to save SPSR value, which is not yet done. */ | |
12264 | printf_unfiltered (_("Process record does not support instruction " | |
12265 | "0x%0x at address %s.\n"), | |
12266 | thumb_insn_r->arm_insn, | |
12267 | paddress (thumb_insn_r->gdbarch, | |
12268 | thumb_insn_r->this_addr)); | |
12269 | return -1; | |
12270 | } | |
12271 | else if ((0 == opcode) || (1 == opcode)) | |
12272 | { | |
12273 | /* ADD(5), ADD(6). */ | |
12274 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12275 | record_buf[0] = reg_src1; | |
12276 | thumb_insn_r->reg_rec_count = 1; | |
12277 | } | |
12278 | else if (2 == opcode) | |
12279 | { | |
12280 | /* ADD(7), SUB(4). */ | |
12281 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12282 | record_buf[0] = ARM_SP_REGNUM; | |
12283 | thumb_insn_r->reg_rec_count = 1; | |
12284 | } | |
12285 | ||
12286 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12287 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12288 | record_buf_mem); | |
12289 | ||
12290 | return 0; | |
12291 | } | |
12292 | ||
12293 | /* Handling opcode 110 insns. */ | |
12294 | ||
12295 | static int | |
12296 | thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r) | |
12297 | { | |
12298 | struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch); | |
12299 | struct regcache *reg_cache = thumb_insn_r->regcache; | |
12300 | ||
12301 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ | |
12302 | uint32_t reg_src1 = 0; | |
12303 | uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count = 0; | |
12304 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; | |
12305 | uint32_t record_buf[24], record_buf_mem[48]; | |
12306 | ||
12307 | ULONGEST u_regval = 0; | |
12308 | ||
12309 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); | |
12310 | opcode2 = bits (thumb_insn_r->arm_insn, 11, 12); | |
12311 | ||
12312 | if (1 == opcode2) | |
12313 | { | |
12314 | ||
12315 | /* LDMIA. */ | |
12316 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12317 | /* Get Rn. */ | |
12318 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12319 | while (register_bits) | |
12320 | { | |
12321 | if (register_bits & 0x00000001) | |
12322 | register_list[register_count++] = 1; | |
12323 | register_bits = register_bits >> 1; | |
12324 | } | |
12325 | record_buf[register_count] = reg_src1; | |
12326 | thumb_insn_r->reg_rec_count = register_count + 1; | |
12327 | for (register_count = 0; register_count < 8; register_count++) | |
12328 | { | |
12329 | if (register_list[register_count]) | |
12330 | { | |
12331 | record_buf[index] = register_count; | |
12332 | index++; | |
12333 | } | |
12334 | } | |
12335 | } | |
12336 | else if (0 == opcode2) | |
12337 | { | |
12338 | /* It handles both STMIA. */ | |
12339 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); | |
12340 | /* Get Rn. */ | |
12341 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); | |
12342 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); | |
12343 | while (register_bits) | |
12344 | { | |
12345 | if (register_bits & 0x00000001) | |
12346 | register_count++; | |
12347 | register_bits = register_bits >> 1; | |
12348 | } | |
12349 | start_address = u_regval; | |
12350 | thumb_insn_r->mem_rec_count = register_count; | |
12351 | while (register_count) | |
12352 | { | |
12353 | record_buf_mem[(register_count * 2) - 1] = start_address; | |
12354 | record_buf_mem[(register_count * 2) - 2] = 4; | |
12355 | start_address = start_address + 4; | |
12356 | register_count--; | |
12357 | } | |
12358 | } | |
12359 | else if (0x1F == opcode1) | |
12360 | { | |
12361 | /* Handle arm syscall insn. */ | |
12362 | if (tdep->arm_swi_record != NULL) | |
12363 | { | |
12364 | ret = tdep->arm_swi_record(reg_cache); | |
12365 | } | |
12366 | else | |
12367 | { | |
12368 | printf_unfiltered (_("no syscall record support\n")); | |
12369 | return -1; | |
12370 | } | |
12371 | } | |
12372 | ||
12373 | /* B (1), conditional branch is automatically taken care in process_record, | |
12374 | as PC is saved there. */ | |
12375 | ||
12376 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12377 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, | |
12378 | record_buf_mem); | |
12379 | ||
12380 | return ret; | |
12381 | } | |
12382 | ||
12383 | /* Handling opcode 111 insns. */ | |
12384 | ||
12385 | static int | |
12386 | thumb_record_branch (insn_decode_record *thumb_insn_r) | |
12387 | { | |
12388 | uint32_t record_buf[8]; | |
12389 | uint32_t bits_h = 0; | |
12390 | ||
12391 | bits_h = bits (thumb_insn_r->arm_insn, 11, 12); | |
12392 | ||
12393 | if (2 == bits_h || 3 == bits_h) | |
12394 | { | |
12395 | /* BL */ | |
12396 | record_buf[0] = ARM_LR_REGNUM; | |
12397 | thumb_insn_r->reg_rec_count = 1; | |
12398 | } | |
12399 | else if (1 == bits_h) | |
12400 | { | |
12401 | /* BLX(1). */ | |
12402 | record_buf[0] = ARM_PS_REGNUM; | |
12403 | record_buf[1] = ARM_LR_REGNUM; | |
12404 | thumb_insn_r->reg_rec_count = 2; | |
12405 | } | |
12406 | ||
12407 | /* B(2) is automatically taken care in process_record, as PC is | |
12408 | saved there. */ | |
12409 | ||
12410 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); | |
12411 | ||
12412 | return 0; | |
12413 | } | |
12414 | ||
12415 | ||
12416 | /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success | |
12417 | and positive val on fauilure. */ | |
12418 | ||
12419 | static int | |
12420 | extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size) | |
12421 | { | |
12422 | gdb_byte buf[insn_size]; | |
12423 | ||
12424 | memset (&buf[0], 0, insn_size); | |
12425 | ||
12426 | if (target_read_memory (insn_record->this_addr, &buf[0], insn_size)) | |
12427 | return 1; | |
12428 | insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0], | |
12429 | insn_size, | |
12430 | gdbarch_byte_order (insn_record->gdbarch)); | |
12431 | return 0; | |
12432 | } | |
12433 | ||
12434 | typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*); | |
12435 | ||
12436 | /* Decode arm/thumb insn depending on condition cods and opcodes; and | |
12437 | dispatch it. */ | |
12438 | ||
12439 | static int | |
12440 | decode_insn (insn_decode_record *arm_record, record_type_t record_type, | |
12441 | uint32_t insn_size) | |
12442 | { | |
12443 | ||
12444 | /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm instruction. */ | |
12445 | static const sti_arm_hdl_fp_t const arm_handle_insn[8] = | |
12446 | { | |
12447 | arm_record_data_proc_misc_ld_str, /* 000. */ | |
12448 | arm_record_data_proc_imm, /* 001. */ | |
12449 | arm_record_ld_st_imm_offset, /* 010. */ | |
12450 | arm_record_ld_st_reg_offset, /* 011. */ | |
12451 | arm_record_ld_st_multiple, /* 100. */ | |
12452 | arm_record_b_bl, /* 101. */ | |
12453 | arm_record_coproc, /* 110. */ | |
12454 | arm_record_coproc_data_proc /* 111. */ | |
12455 | }; | |
12456 | ||
12457 | /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb instruction. */ | |
12458 | static const sti_arm_hdl_fp_t const thumb_handle_insn[8] = | |
12459 | { \ | |
12460 | thumb_record_shift_add_sub, /* 000. */ | |
12461 | thumb_record_add_sub_cmp_mov, /* 001. */ | |
12462 | thumb_record_ld_st_reg_offset, /* 010. */ | |
12463 | thumb_record_ld_st_imm_offset, /* 011. */ | |
12464 | thumb_record_ld_st_stack, /* 100. */ | |
12465 | thumb_record_misc, /* 101. */ | |
12466 | thumb_record_ldm_stm_swi, /* 110. */ | |
12467 | thumb_record_branch /* 111. */ | |
12468 | }; | |
12469 | ||
12470 | uint32_t ret = 0; /* return value: negative:failure 0:success. */ | |
12471 | uint32_t insn_id = 0; | |
12472 | ||
12473 | if (extract_arm_insn (arm_record, insn_size)) | |
12474 | { | |
12475 | if (record_debug) | |
12476 | { | |
12477 | printf_unfiltered (_("Process record: error reading memory at " | |
12478 | "addr %s len = %d.\n"), | |
12479 | paddress (arm_record->gdbarch, arm_record->this_addr), insn_size); | |
12480 | } | |
12481 | return -1; | |
12482 | } | |
12483 | else if (ARM_RECORD == record_type) | |
12484 | { | |
12485 | arm_record->cond = bits (arm_record->arm_insn, 28, 31); | |
12486 | insn_id = bits (arm_record->arm_insn, 25, 27); | |
12487 | ret = arm_record_extension_space (arm_record); | |
12488 | /* If this insn has fallen into extension space | |
12489 | then we need not decode it anymore. */ | |
12490 | if (ret != -1 && !INSN_RECORDED(arm_record)) | |
12491 | { | |
12492 | ret = arm_handle_insn[insn_id] (arm_record); | |
12493 | } | |
12494 | } | |
12495 | else if (THUMB_RECORD == record_type) | |
12496 | { | |
12497 | /* As thumb does not have condition codes, we set negative. */ | |
12498 | arm_record->cond = -1; | |
12499 | insn_id = bits (arm_record->arm_insn, 13, 15); | |
12500 | ret = thumb_handle_insn[insn_id] (arm_record); | |
12501 | } | |
12502 | else if (THUMB2_RECORD == record_type) | |
12503 | { | |
12504 | printf_unfiltered (_("Process record doesnt support thumb32 instruction " | |
12505 | "0x%0x at address %s.\n"),arm_record->arm_insn, | |
12506 | paddress (arm_record->gdbarch, | |
12507 | arm_record->this_addr)); | |
12508 | ret = -1; | |
12509 | } | |
12510 | else | |
12511 | { | |
12512 | /* Throw assertion. */ | |
12513 | gdb_assert_not_reached ("not a valid instruction, could not decode"); | |
12514 | } | |
12515 | ||
12516 | return ret; | |
12517 | } | |
12518 | ||
12519 | ||
12520 | /* Cleans up local record registers and memory allocations. */ | |
12521 | ||
12522 | static void | |
12523 | deallocate_reg_mem (insn_decode_record *record) | |
12524 | { | |
12525 | xfree (record->arm_regs); | |
12526 | xfree (record->arm_mems); | |
12527 | } | |
12528 | ||
12529 | ||
12530 | /* Parse the current instruction and record the values of the registers and | |
12531 | memory that will be changed in current instruction to record_arch_list". | |
12532 | Return -1 if something is wrong. */ | |
12533 | ||
12534 | int | |
12535 | arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache, | |
12536 | CORE_ADDR insn_addr) | |
12537 | { | |
12538 | ||
12539 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
12540 | uint32_t no_of_rec = 0; | |
12541 | uint32_t ret = 0; /* return value: -1:record failure ; 0:success */ | |
12542 | ULONGEST t_bit = 0, insn_id = 0; | |
12543 | ||
12544 | ULONGEST u_regval = 0; | |
12545 | ||
12546 | insn_decode_record arm_record; | |
12547 | ||
12548 | memset (&arm_record, 0, sizeof (insn_decode_record)); | |
12549 | arm_record.regcache = regcache; | |
12550 | arm_record.this_addr = insn_addr; | |
12551 | arm_record.gdbarch = gdbarch; | |
12552 | ||
12553 | ||
12554 | if (record_debug > 1) | |
12555 | { | |
12556 | fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record " | |
12557 | "addr = %s\n", | |
12558 | paddress (gdbarch, arm_record.this_addr)); | |
12559 | } | |
12560 | ||
12561 | if (extract_arm_insn (&arm_record, 2)) | |
12562 | { | |
12563 | if (record_debug) | |
12564 | { | |
12565 | printf_unfiltered (_("Process record: error reading memory at " | |
12566 | "addr %s len = %d.\n"), | |
12567 | paddress (arm_record.gdbarch, | |
12568 | arm_record.this_addr), 2); | |
12569 | } | |
12570 | return -1; | |
12571 | } | |
12572 | ||
12573 | /* Check the insn, whether it is thumb or arm one. */ | |
12574 | ||
12575 | t_bit = arm_psr_thumb_bit (arm_record.gdbarch); | |
12576 | regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM, &u_regval); | |
12577 | ||
12578 | ||
12579 | if (!(u_regval & t_bit)) | |
12580 | { | |
12581 | /* We are decoding arm insn. */ | |
12582 | ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES); | |
12583 | } | |
12584 | else | |
12585 | { | |
12586 | insn_id = bits (arm_record.arm_insn, 11, 15); | |
12587 | /* is it thumb2 insn? */ | |
12588 | if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id)) | |
12589 | { | |
12590 | ret = decode_insn (&arm_record, THUMB2_RECORD, | |
12591 | THUMB2_INSN_SIZE_BYTES); | |
12592 | } | |
12593 | else | |
12594 | { | |
12595 | /* We are decoding thumb insn. */ | |
12596 | ret = decode_insn (&arm_record, THUMB_RECORD, THUMB_INSN_SIZE_BYTES); | |
12597 | } | |
12598 | } | |
12599 | ||
12600 | if (0 == ret) | |
12601 | { | |
12602 | /* Record registers. */ | |
12603 | record_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM); | |
12604 | if (arm_record.arm_regs) | |
12605 | { | |
12606 | for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count; no_of_rec++) | |
12607 | { | |
12608 | if (record_arch_list_add_reg (arm_record.regcache , | |
12609 | arm_record.arm_regs[no_of_rec])) | |
12610 | ret = -1; | |
12611 | } | |
12612 | } | |
12613 | /* Record memories. */ | |
12614 | if (arm_record.arm_mems) | |
12615 | { | |
12616 | for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count; no_of_rec++) | |
12617 | { | |
12618 | if (record_arch_list_add_mem | |
12619 | ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr, | |
12620 | arm_record.arm_mems[no_of_rec].len)) | |
12621 | ret = -1; | |
12622 | } | |
12623 | } | |
12624 | ||
12625 | if (record_arch_list_add_end ()) | |
12626 | ret = -1; | |
12627 | } | |
12628 | ||
12629 | ||
12630 | deallocate_reg_mem (&arm_record); | |
12631 | ||
12632 | return ret; | |
12633 | } | |
12634 |