Commit | Line | Data |
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ed9a39eb | 1 | /* Common target dependent code for GDB on ARM systems. |
0fd88904 | 2 | |
6aba47ca | 3 | Copyright (C) 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1998, 1999, 2000, |
7b6bb8da | 4 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
9b254dd1 | 5 | Free Software Foundation, Inc. |
c906108c | 6 | |
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 21 | |
0963b4bd | 22 | #include <ctype.h> /* XXX for isupper (). */ |
34e8f22d | 23 | |
c906108c SS |
24 | #include "defs.h" |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
c906108c | 29 | #include "gdb_string.h" |
0963b4bd | 30 | #include "dis-asm.h" /* For register styles. */ |
4e052eda | 31 | #include "regcache.h" |
54483882 | 32 | #include "reggroups.h" |
d16aafd8 | 33 | #include "doublest.h" |
fd0407d6 | 34 | #include "value.h" |
34e8f22d | 35 | #include "arch-utils.h" |
4be87837 | 36 | #include "osabi.h" |
eb5492fa DJ |
37 | #include "frame-unwind.h" |
38 | #include "frame-base.h" | |
39 | #include "trad-frame.h" | |
842e1f1e DJ |
40 | #include "objfiles.h" |
41 | #include "dwarf2-frame.h" | |
e4c16157 | 42 | #include "gdbtypes.h" |
29d73ae4 | 43 | #include "prologue-value.h" |
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 | |
9779414d DJ |
58 | #include "features/arm-with-m.c" |
59 | ||
6529d2dd AC |
60 | static int arm_debug; |
61 | ||
082fc60d RE |
62 | /* Macros for setting and testing a bit in a minimal symbol that marks |
63 | it as Thumb function. The MSB of the minimal symbol's "info" field | |
f594e5e9 | 64 | is used for this purpose. |
082fc60d RE |
65 | |
66 | MSYMBOL_SET_SPECIAL Actually sets the "special" bit. | |
f594e5e9 | 67 | MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */ |
082fc60d | 68 | |
0963b4bd | 69 | #define MSYMBOL_SET_SPECIAL(msym) \ |
b887350f | 70 | MSYMBOL_TARGET_FLAG_1 (msym) = 1 |
082fc60d RE |
71 | |
72 | #define MSYMBOL_IS_SPECIAL(msym) \ | |
b887350f | 73 | MSYMBOL_TARGET_FLAG_1 (msym) |
082fc60d | 74 | |
60c5725c DJ |
75 | /* Per-objfile data used for mapping symbols. */ |
76 | static const struct objfile_data *arm_objfile_data_key; | |
77 | ||
78 | struct arm_mapping_symbol | |
79 | { | |
80 | bfd_vma value; | |
81 | char type; | |
82 | }; | |
83 | typedef struct arm_mapping_symbol arm_mapping_symbol_s; | |
84 | DEF_VEC_O(arm_mapping_symbol_s); | |
85 | ||
86 | struct arm_per_objfile | |
87 | { | |
88 | VEC(arm_mapping_symbol_s) **section_maps; | |
89 | }; | |
90 | ||
afd7eef0 RE |
91 | /* The list of available "set arm ..." and "show arm ..." commands. */ |
92 | static struct cmd_list_element *setarmcmdlist = NULL; | |
93 | static struct cmd_list_element *showarmcmdlist = NULL; | |
94 | ||
fd50bc42 RE |
95 | /* The type of floating-point to use. Keep this in sync with enum |
96 | arm_float_model, and the help string in _initialize_arm_tdep. */ | |
97 | static const char *fp_model_strings[] = | |
98 | { | |
99 | "auto", | |
100 | "softfpa", | |
101 | "fpa", | |
102 | "softvfp", | |
28e97307 DJ |
103 | "vfp", |
104 | NULL | |
fd50bc42 RE |
105 | }; |
106 | ||
107 | /* A variable that can be configured by the user. */ | |
108 | static enum arm_float_model arm_fp_model = ARM_FLOAT_AUTO; | |
109 | static const char *current_fp_model = "auto"; | |
110 | ||
28e97307 DJ |
111 | /* The ABI to use. Keep this in sync with arm_abi_kind. */ |
112 | static const char *arm_abi_strings[] = | |
113 | { | |
114 | "auto", | |
115 | "APCS", | |
116 | "AAPCS", | |
117 | NULL | |
118 | }; | |
119 | ||
120 | /* A variable that can be configured by the user. */ | |
121 | static enum arm_abi_kind arm_abi_global = ARM_ABI_AUTO; | |
122 | static const char *arm_abi_string = "auto"; | |
123 | ||
0428b8f5 DJ |
124 | /* The execution mode to assume. */ |
125 | static const char *arm_mode_strings[] = | |
126 | { | |
127 | "auto", | |
128 | "arm", | |
68770265 MGD |
129 | "thumb", |
130 | NULL | |
0428b8f5 DJ |
131 | }; |
132 | ||
133 | static const char *arm_fallback_mode_string = "auto"; | |
134 | static const char *arm_force_mode_string = "auto"; | |
135 | ||
18819fa6 UW |
136 | /* Internal override of the execution mode. -1 means no override, |
137 | 0 means override to ARM mode, 1 means override to Thumb mode. | |
138 | The effect is the same as if arm_force_mode has been set by the | |
139 | user (except the internal override has precedence over a user's | |
140 | arm_force_mode override). */ | |
141 | static int arm_override_mode = -1; | |
142 | ||
94c30b78 | 143 | /* Number of different reg name sets (options). */ |
afd7eef0 | 144 | static int num_disassembly_options; |
bc90b915 | 145 | |
f32bf4a4 YQ |
146 | /* The standard register names, and all the valid aliases for them. Note |
147 | that `fp', `sp' and `pc' are not added in this alias list, because they | |
148 | have been added as builtin user registers in | |
149 | std-regs.c:_initialize_frame_reg. */ | |
123dc839 DJ |
150 | static const struct |
151 | { | |
152 | const char *name; | |
153 | int regnum; | |
154 | } arm_register_aliases[] = { | |
155 | /* Basic register numbers. */ | |
156 | { "r0", 0 }, | |
157 | { "r1", 1 }, | |
158 | { "r2", 2 }, | |
159 | { "r3", 3 }, | |
160 | { "r4", 4 }, | |
161 | { "r5", 5 }, | |
162 | { "r6", 6 }, | |
163 | { "r7", 7 }, | |
164 | { "r8", 8 }, | |
165 | { "r9", 9 }, | |
166 | { "r10", 10 }, | |
167 | { "r11", 11 }, | |
168 | { "r12", 12 }, | |
169 | { "r13", 13 }, | |
170 | { "r14", 14 }, | |
171 | { "r15", 15 }, | |
172 | /* Synonyms (argument and variable registers). */ | |
173 | { "a1", 0 }, | |
174 | { "a2", 1 }, | |
175 | { "a3", 2 }, | |
176 | { "a4", 3 }, | |
177 | { "v1", 4 }, | |
178 | { "v2", 5 }, | |
179 | { "v3", 6 }, | |
180 | { "v4", 7 }, | |
181 | { "v5", 8 }, | |
182 | { "v6", 9 }, | |
183 | { "v7", 10 }, | |
184 | { "v8", 11 }, | |
185 | /* Other platform-specific names for r9. */ | |
186 | { "sb", 9 }, | |
187 | { "tr", 9 }, | |
188 | /* Special names. */ | |
189 | { "ip", 12 }, | |
123dc839 | 190 | { "lr", 14 }, |
123dc839 DJ |
191 | /* Names used by GCC (not listed in the ARM EABI). */ |
192 | { "sl", 10 }, | |
123dc839 DJ |
193 | /* A special name from the older ATPCS. */ |
194 | { "wr", 7 }, | |
195 | }; | |
bc90b915 | 196 | |
123dc839 | 197 | static const char *const arm_register_names[] = |
da59e081 JM |
198 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
199 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ | |
200 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ | |
201 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ | |
202 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ | |
203 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ | |
94c30b78 | 204 | "fps", "cpsr" }; /* 24 25 */ |
ed9a39eb | 205 | |
afd7eef0 RE |
206 | /* Valid register name styles. */ |
207 | static const char **valid_disassembly_styles; | |
ed9a39eb | 208 | |
afd7eef0 RE |
209 | /* Disassembly style to use. Default to "std" register names. */ |
210 | static const char *disassembly_style; | |
96baa820 | 211 | |
ed9a39eb | 212 | /* This is used to keep the bfd arch_info in sync with the disassembly |
afd7eef0 RE |
213 | style. */ |
214 | static void set_disassembly_style_sfunc(char *, int, | |
ed9a39eb | 215 | struct cmd_list_element *); |
afd7eef0 | 216 | static void set_disassembly_style (void); |
ed9a39eb | 217 | |
b508a996 | 218 | static void convert_from_extended (const struct floatformat *, const void *, |
be8626e0 | 219 | void *, int); |
b508a996 | 220 | static void convert_to_extended (const struct floatformat *, void *, |
be8626e0 | 221 | const void *, int); |
ed9a39eb | 222 | |
05d1431c PA |
223 | static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch, |
224 | struct regcache *regcache, | |
225 | int regnum, gdb_byte *buf); | |
58d6951d DJ |
226 | static void arm_neon_quad_write (struct gdbarch *gdbarch, |
227 | struct regcache *regcache, | |
228 | int regnum, const gdb_byte *buf); | |
229 | ||
9b8d791a | 230 | struct arm_prologue_cache |
c3b4394c | 231 | { |
eb5492fa DJ |
232 | /* The stack pointer at the time this frame was created; i.e. the |
233 | caller's stack pointer when this function was called. It is used | |
234 | to identify this frame. */ | |
235 | CORE_ADDR prev_sp; | |
236 | ||
4be43953 DJ |
237 | /* The frame base for this frame is just prev_sp - frame size. |
238 | FRAMESIZE is the distance from the frame pointer to the | |
239 | initial stack pointer. */ | |
eb5492fa | 240 | |
c3b4394c | 241 | int framesize; |
eb5492fa DJ |
242 | |
243 | /* The register used to hold the frame pointer for this frame. */ | |
c3b4394c | 244 | int framereg; |
eb5492fa DJ |
245 | |
246 | /* Saved register offsets. */ | |
247 | struct trad_frame_saved_reg *saved_regs; | |
c3b4394c | 248 | }; |
ed9a39eb | 249 | |
0d39a070 DJ |
250 | static CORE_ADDR arm_analyze_prologue (struct gdbarch *gdbarch, |
251 | CORE_ADDR prologue_start, | |
252 | CORE_ADDR prologue_end, | |
253 | struct arm_prologue_cache *cache); | |
254 | ||
cca44b1b JB |
255 | /* Architecture version for displaced stepping. This effects the behaviour of |
256 | certain instructions, and really should not be hard-wired. */ | |
257 | ||
258 | #define DISPLACED_STEPPING_ARCH_VERSION 5 | |
259 | ||
bc90b915 FN |
260 | /* Addresses for calling Thumb functions have the bit 0 set. |
261 | Here are some macros to test, set, or clear bit 0 of addresses. */ | |
262 | #define IS_THUMB_ADDR(addr) ((addr) & 1) | |
263 | #define MAKE_THUMB_ADDR(addr) ((addr) | 1) | |
264 | #define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1) | |
265 | ||
94c30b78 | 266 | /* Set to true if the 32-bit mode is in use. */ |
c906108c SS |
267 | |
268 | int arm_apcs_32 = 1; | |
269 | ||
9779414d DJ |
270 | /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */ |
271 | ||
478fd957 | 272 | int |
9779414d DJ |
273 | arm_psr_thumb_bit (struct gdbarch *gdbarch) |
274 | { | |
275 | if (gdbarch_tdep (gdbarch)->is_m) | |
276 | return XPSR_T; | |
277 | else | |
278 | return CPSR_T; | |
279 | } | |
280 | ||
b39cc962 DJ |
281 | /* Determine if FRAME is executing in Thumb mode. */ |
282 | ||
25b41d01 | 283 | int |
b39cc962 DJ |
284 | arm_frame_is_thumb (struct frame_info *frame) |
285 | { | |
286 | CORE_ADDR cpsr; | |
9779414d | 287 | ULONGEST t_bit = arm_psr_thumb_bit (get_frame_arch (frame)); |
b39cc962 DJ |
288 | |
289 | /* Every ARM frame unwinder can unwind the T bit of the CPSR, either | |
290 | directly (from a signal frame or dummy frame) or by interpreting | |
291 | the saved LR (from a prologue or DWARF frame). So consult it and | |
292 | trust the unwinders. */ | |
293 | cpsr = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
294 | ||
9779414d | 295 | return (cpsr & t_bit) != 0; |
b39cc962 DJ |
296 | } |
297 | ||
60c5725c DJ |
298 | /* Callback for VEC_lower_bound. */ |
299 | ||
300 | static inline int | |
301 | arm_compare_mapping_symbols (const struct arm_mapping_symbol *lhs, | |
302 | const struct arm_mapping_symbol *rhs) | |
303 | { | |
304 | return lhs->value < rhs->value; | |
305 | } | |
306 | ||
f9d67f43 DJ |
307 | /* Search for the mapping symbol covering MEMADDR. If one is found, |
308 | return its type. Otherwise, return 0. If START is non-NULL, | |
309 | set *START to the location of the mapping symbol. */ | |
c906108c | 310 | |
f9d67f43 DJ |
311 | static char |
312 | arm_find_mapping_symbol (CORE_ADDR memaddr, CORE_ADDR *start) | |
c906108c | 313 | { |
60c5725c | 314 | struct obj_section *sec; |
0428b8f5 | 315 | |
60c5725c DJ |
316 | /* If there are mapping symbols, consult them. */ |
317 | sec = find_pc_section (memaddr); | |
318 | if (sec != NULL) | |
319 | { | |
320 | struct arm_per_objfile *data; | |
321 | VEC(arm_mapping_symbol_s) *map; | |
aded6f54 PA |
322 | struct arm_mapping_symbol map_key = { memaddr - obj_section_addr (sec), |
323 | 0 }; | |
60c5725c DJ |
324 | unsigned int idx; |
325 | ||
326 | data = objfile_data (sec->objfile, arm_objfile_data_key); | |
327 | if (data != NULL) | |
328 | { | |
329 | map = data->section_maps[sec->the_bfd_section->index]; | |
330 | if (!VEC_empty (arm_mapping_symbol_s, map)) | |
331 | { | |
332 | struct arm_mapping_symbol *map_sym; | |
333 | ||
334 | idx = VEC_lower_bound (arm_mapping_symbol_s, map, &map_key, | |
335 | arm_compare_mapping_symbols); | |
336 | ||
337 | /* VEC_lower_bound finds the earliest ordered insertion | |
338 | point. If the following symbol starts at this exact | |
339 | address, we use that; otherwise, the preceding | |
340 | mapping symbol covers this address. */ | |
341 | if (idx < VEC_length (arm_mapping_symbol_s, map)) | |
342 | { | |
343 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx); | |
344 | if (map_sym->value == map_key.value) | |
f9d67f43 DJ |
345 | { |
346 | if (start) | |
347 | *start = map_sym->value + obj_section_addr (sec); | |
348 | return map_sym->type; | |
349 | } | |
60c5725c DJ |
350 | } |
351 | ||
352 | if (idx > 0) | |
353 | { | |
354 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx - 1); | |
f9d67f43 DJ |
355 | if (start) |
356 | *start = map_sym->value + obj_section_addr (sec); | |
357 | return map_sym->type; | |
60c5725c DJ |
358 | } |
359 | } | |
360 | } | |
361 | } | |
362 | ||
f9d67f43 DJ |
363 | return 0; |
364 | } | |
365 | ||
366 | /* Determine if the program counter specified in MEMADDR is in a Thumb | |
367 | function. This function should be called for addresses unrelated to | |
368 | any executing frame; otherwise, prefer arm_frame_is_thumb. */ | |
369 | ||
e3039479 | 370 | int |
9779414d | 371 | arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr) |
f9d67f43 DJ |
372 | { |
373 | struct obj_section *sec; | |
374 | struct minimal_symbol *sym; | |
375 | char type; | |
a42244db YQ |
376 | struct displaced_step_closure* dsc |
377 | = get_displaced_step_closure_by_addr(memaddr); | |
378 | ||
379 | /* If checking the mode of displaced instruction in copy area, the mode | |
380 | should be determined by instruction on the original address. */ | |
381 | if (dsc) | |
382 | { | |
383 | if (debug_displaced) | |
384 | fprintf_unfiltered (gdb_stdlog, | |
385 | "displaced: check mode of %.8lx instead of %.8lx\n", | |
386 | (unsigned long) dsc->insn_addr, | |
387 | (unsigned long) memaddr); | |
388 | memaddr = dsc->insn_addr; | |
389 | } | |
f9d67f43 DJ |
390 | |
391 | /* If bit 0 of the address is set, assume this is a Thumb address. */ | |
392 | if (IS_THUMB_ADDR (memaddr)) | |
393 | return 1; | |
394 | ||
18819fa6 UW |
395 | /* Respect internal mode override if active. */ |
396 | if (arm_override_mode != -1) | |
397 | return arm_override_mode; | |
398 | ||
f9d67f43 DJ |
399 | /* If the user wants to override the symbol table, let him. */ |
400 | if (strcmp (arm_force_mode_string, "arm") == 0) | |
401 | return 0; | |
402 | if (strcmp (arm_force_mode_string, "thumb") == 0) | |
403 | return 1; | |
404 | ||
9779414d DJ |
405 | /* ARM v6-M and v7-M are always in Thumb mode. */ |
406 | if (gdbarch_tdep (gdbarch)->is_m) | |
407 | return 1; | |
408 | ||
f9d67f43 DJ |
409 | /* If there are mapping symbols, consult them. */ |
410 | type = arm_find_mapping_symbol (memaddr, NULL); | |
411 | if (type) | |
412 | return type == 't'; | |
413 | ||
ed9a39eb | 414 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
c906108c SS |
415 | sym = lookup_minimal_symbol_by_pc (memaddr); |
416 | if (sym) | |
0428b8f5 DJ |
417 | return (MSYMBOL_IS_SPECIAL (sym)); |
418 | ||
419 | /* If the user wants to override the fallback mode, let them. */ | |
420 | if (strcmp (arm_fallback_mode_string, "arm") == 0) | |
421 | return 0; | |
422 | if (strcmp (arm_fallback_mode_string, "thumb") == 0) | |
423 | return 1; | |
424 | ||
425 | /* If we couldn't find any symbol, but we're talking to a running | |
426 | target, then trust the current value of $cpsr. This lets | |
427 | "display/i $pc" always show the correct mode (though if there is | |
428 | a symbol table we will not reach here, so it still may not be | |
18819fa6 | 429 | displayed in the mode it will be executed). */ |
0428b8f5 | 430 | if (target_has_registers) |
18819fa6 | 431 | return arm_frame_is_thumb (get_current_frame ()); |
0428b8f5 DJ |
432 | |
433 | /* Otherwise we're out of luck; we assume ARM. */ | |
434 | return 0; | |
c906108c SS |
435 | } |
436 | ||
181c1381 | 437 | /* Remove useless bits from addresses in a running program. */ |
34e8f22d | 438 | static CORE_ADDR |
24568a2c | 439 | arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val) |
c906108c | 440 | { |
a3a2ee65 | 441 | if (arm_apcs_32) |
dd6be234 | 442 | return UNMAKE_THUMB_ADDR (val); |
c906108c | 443 | else |
a3a2ee65 | 444 | return (val & 0x03fffffc); |
c906108c SS |
445 | } |
446 | ||
181c1381 RE |
447 | /* When reading symbols, we need to zap the low bit of the address, |
448 | which may be set to 1 for Thumb functions. */ | |
34e8f22d | 449 | static CORE_ADDR |
24568a2c | 450 | arm_smash_text_address (struct gdbarch *gdbarch, CORE_ADDR val) |
181c1381 RE |
451 | { |
452 | return val & ~1; | |
453 | } | |
454 | ||
0d39a070 | 455 | /* Return 1 if PC is the start of a compiler helper function which |
e0634ccf UW |
456 | can be safely ignored during prologue skipping. IS_THUMB is true |
457 | if the function is known to be a Thumb function due to the way it | |
458 | is being called. */ | |
0d39a070 | 459 | static int |
e0634ccf | 460 | skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb) |
0d39a070 | 461 | { |
e0634ccf | 462 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
0d39a070 | 463 | struct minimal_symbol *msym; |
0d39a070 DJ |
464 | |
465 | msym = lookup_minimal_symbol_by_pc (pc); | |
e0634ccf UW |
466 | if (msym != NULL |
467 | && SYMBOL_VALUE_ADDRESS (msym) == pc | |
468 | && SYMBOL_LINKAGE_NAME (msym) != NULL) | |
469 | { | |
470 | const char *name = SYMBOL_LINKAGE_NAME (msym); | |
0d39a070 | 471 | |
e0634ccf UW |
472 | /* The GNU linker's Thumb call stub to foo is named |
473 | __foo_from_thumb. */ | |
474 | if (strstr (name, "_from_thumb") != NULL) | |
475 | name += 2; | |
0d39a070 | 476 | |
e0634ccf UW |
477 | /* On soft-float targets, __truncdfsf2 is called to convert promoted |
478 | arguments to their argument types in non-prototyped | |
479 | functions. */ | |
480 | if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0) | |
481 | return 1; | |
482 | if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0) | |
483 | return 1; | |
0d39a070 | 484 | |
e0634ccf UW |
485 | /* Internal functions related to thread-local storage. */ |
486 | if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0) | |
487 | return 1; | |
488 | if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0) | |
489 | return 1; | |
490 | } | |
491 | else | |
492 | { | |
493 | /* If we run against a stripped glibc, we may be unable to identify | |
494 | special functions by name. Check for one important case, | |
495 | __aeabi_read_tp, by comparing the *code* against the default | |
496 | implementation (this is hand-written ARM assembler in glibc). */ | |
497 | ||
498 | if (!is_thumb | |
499 | && read_memory_unsigned_integer (pc, 4, byte_order_for_code) | |
500 | == 0xe3e00a0f /* mov r0, #0xffff0fff */ | |
501 | && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code) | |
502 | == 0xe240f01f) /* sub pc, r0, #31 */ | |
503 | return 1; | |
504 | } | |
ec3d575a | 505 | |
0d39a070 DJ |
506 | return 0; |
507 | } | |
508 | ||
509 | /* Support routines for instruction parsing. */ | |
510 | #define submask(x) ((1L << ((x) + 1)) - 1) | |
511 | #define bit(obj,st) (((obj) >> (st)) & 1) | |
512 | #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) | |
513 | #define sbits(obj,st,fn) \ | |
514 | ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st)))) | |
515 | #define BranchDest(addr,instr) \ | |
516 | ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2))) | |
517 | ||
621c6d5b YQ |
518 | /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is |
519 | the first 16-bit of instruction, and INSN2 is the second 16-bit of | |
520 | instruction. */ | |
521 | #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \ | |
522 | ((bits ((insn1), 0, 3) << 12) \ | |
523 | | (bits ((insn1), 10, 10) << 11) \ | |
524 | | (bits ((insn2), 12, 14) << 8) \ | |
525 | | bits ((insn2), 0, 7)) | |
526 | ||
527 | /* Extract the immediate from instruction movw/movt of encoding A. INSN is | |
528 | the 32-bit instruction. */ | |
529 | #define EXTRACT_MOVW_MOVT_IMM_A(insn) \ | |
530 | ((bits ((insn), 16, 19) << 12) \ | |
531 | | bits ((insn), 0, 11)) | |
532 | ||
ec3d575a UW |
533 | /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */ |
534 | ||
535 | static unsigned int | |
536 | thumb_expand_immediate (unsigned int imm) | |
537 | { | |
538 | unsigned int count = imm >> 7; | |
539 | ||
540 | if (count < 8) | |
541 | switch (count / 2) | |
542 | { | |
543 | case 0: | |
544 | return imm & 0xff; | |
545 | case 1: | |
546 | return (imm & 0xff) | ((imm & 0xff) << 16); | |
547 | case 2: | |
548 | return ((imm & 0xff) << 8) | ((imm & 0xff) << 24); | |
549 | case 3: | |
550 | return (imm & 0xff) | ((imm & 0xff) << 8) | |
551 | | ((imm & 0xff) << 16) | ((imm & 0xff) << 24); | |
552 | } | |
553 | ||
554 | return (0x80 | (imm & 0x7f)) << (32 - count); | |
555 | } | |
556 | ||
557 | /* Return 1 if the 16-bit Thumb instruction INST might change | |
558 | control flow, 0 otherwise. */ | |
559 | ||
560 | static int | |
561 | thumb_instruction_changes_pc (unsigned short inst) | |
562 | { | |
563 | if ((inst & 0xff00) == 0xbd00) /* pop {rlist, pc} */ | |
564 | return 1; | |
565 | ||
566 | if ((inst & 0xf000) == 0xd000) /* conditional branch */ | |
567 | return 1; | |
568 | ||
569 | if ((inst & 0xf800) == 0xe000) /* unconditional branch */ | |
570 | return 1; | |
571 | ||
572 | if ((inst & 0xff00) == 0x4700) /* bx REG, blx REG */ | |
573 | return 1; | |
574 | ||
ad8b5167 UW |
575 | if ((inst & 0xff87) == 0x4687) /* mov pc, REG */ |
576 | return 1; | |
577 | ||
ec3d575a UW |
578 | if ((inst & 0xf500) == 0xb100) /* CBNZ or CBZ. */ |
579 | return 1; | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | /* Return 1 if the 32-bit Thumb instruction in INST1 and INST2 | |
585 | might change control flow, 0 otherwise. */ | |
586 | ||
587 | static int | |
588 | thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2) | |
589 | { | |
590 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
591 | { | |
592 | /* Branches and miscellaneous control instructions. */ | |
593 | ||
594 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
595 | { | |
596 | /* B, BL, BLX. */ | |
597 | return 1; | |
598 | } | |
599 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
600 | { | |
601 | /* SUBS PC, LR, #imm8. */ | |
602 | return 1; | |
603 | } | |
604 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) | |
605 | { | |
606 | /* Conditional branch. */ | |
607 | return 1; | |
608 | } | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | if ((inst1 & 0xfe50) == 0xe810) | |
614 | { | |
615 | /* Load multiple or RFE. */ | |
616 | ||
617 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
618 | { | |
619 | /* LDMIA or POP */ | |
620 | if (bit (inst2, 15)) | |
621 | return 1; | |
622 | } | |
623 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
624 | { | |
625 | /* LDMDB */ | |
626 | if (bit (inst2, 15)) | |
627 | return 1; | |
628 | } | |
629 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
630 | { | |
631 | /* RFEIA */ | |
632 | return 1; | |
633 | } | |
634 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
635 | { | |
636 | /* RFEDB */ | |
637 | return 1; | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
644 | { | |
645 | /* MOV PC or MOVS PC. */ | |
646 | return 1; | |
647 | } | |
648 | ||
649 | if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
650 | { | |
651 | /* LDR PC. */ | |
652 | if (bits (inst1, 0, 3) == 15) | |
653 | return 1; | |
654 | if (bit (inst1, 7)) | |
655 | return 1; | |
656 | if (bit (inst2, 11)) | |
657 | return 1; | |
658 | if ((inst2 & 0x0fc0) == 0x0000) | |
659 | return 1; | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
665 | { | |
666 | /* TBB. */ | |
667 | return 1; | |
668 | } | |
669 | ||
670 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) | |
671 | { | |
672 | /* TBH. */ | |
673 | return 1; | |
674 | } | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
29d73ae4 DJ |
679 | /* Analyze a Thumb prologue, looking for a recognizable stack frame |
680 | and frame pointer. Scan until we encounter a store that could | |
0d39a070 DJ |
681 | clobber the stack frame unexpectedly, or an unknown instruction. |
682 | Return the last address which is definitely safe to skip for an | |
683 | initial breakpoint. */ | |
c906108c SS |
684 | |
685 | static CORE_ADDR | |
29d73ae4 DJ |
686 | thumb_analyze_prologue (struct gdbarch *gdbarch, |
687 | CORE_ADDR start, CORE_ADDR limit, | |
688 | struct arm_prologue_cache *cache) | |
c906108c | 689 | { |
0d39a070 | 690 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
e17a4113 | 691 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
29d73ae4 DJ |
692 | int i; |
693 | pv_t regs[16]; | |
694 | struct pv_area *stack; | |
695 | struct cleanup *back_to; | |
696 | CORE_ADDR offset; | |
ec3d575a | 697 | CORE_ADDR unrecognized_pc = 0; |
da3c6d4a | 698 | |
29d73ae4 DJ |
699 | for (i = 0; i < 16; i++) |
700 | regs[i] = pv_register (i, 0); | |
55f960e1 | 701 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
29d73ae4 DJ |
702 | back_to = make_cleanup_free_pv_area (stack); |
703 | ||
29d73ae4 | 704 | while (start < limit) |
c906108c | 705 | { |
29d73ae4 DJ |
706 | unsigned short insn; |
707 | ||
e17a4113 | 708 | insn = read_memory_unsigned_integer (start, 2, byte_order_for_code); |
9d4fde75 | 709 | |
94c30b78 | 710 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
da59e081 | 711 | { |
29d73ae4 DJ |
712 | int regno; |
713 | int mask; | |
4be43953 DJ |
714 | |
715 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) | |
716 | break; | |
29d73ae4 DJ |
717 | |
718 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says | |
719 | whether to save LR (R14). */ | |
720 | mask = (insn & 0xff) | ((insn & 0x100) << 6); | |
721 | ||
722 | /* Calculate offsets of saved R0-R7 and LR. */ | |
723 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
724 | if (mask & (1 << regno)) | |
725 | { | |
29d73ae4 DJ |
726 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
727 | -4); | |
728 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); | |
729 | } | |
da59e081 | 730 | } |
da3c6d4a MS |
731 | else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR |
732 | sub sp, #simm */ | |
da59e081 | 733 | { |
29d73ae4 DJ |
734 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
735 | if (insn & 0x80) /* Check for SUB. */ | |
736 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], | |
737 | -offset); | |
da59e081 | 738 | else |
29d73ae4 DJ |
739 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
740 | offset); | |
da59e081 | 741 | } |
0d39a070 DJ |
742 | else if ((insn & 0xf800) == 0xa800) /* add Rd, sp, #imm */ |
743 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM], | |
744 | (insn & 0xff) << 2); | |
745 | else if ((insn & 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */ | |
746 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
747 | regs[bits (insn, 0, 2)] = pv_add_constant (regs[bits (insn, 3, 5)], | |
748 | bits (insn, 6, 8)); | |
749 | else if ((insn & 0xf800) == 0x3000 /* add Rd, #imm */ | |
750 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
751 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[bits (insn, 8, 10)], | |
752 | bits (insn, 0, 7)); | |
753 | else if ((insn & 0xfe00) == 0x1800 /* add Rd, Rn, Rm */ | |
754 | && pv_is_register (regs[bits (insn, 6, 8)], ARM_SP_REGNUM) | |
755 | && pv_is_constant (regs[bits (insn, 3, 5)])) | |
756 | regs[bits (insn, 0, 2)] = pv_add (regs[bits (insn, 3, 5)], | |
757 | regs[bits (insn, 6, 8)]); | |
758 | else if ((insn & 0xff00) == 0x4400 /* add Rd, Rm */ | |
759 | && pv_is_constant (regs[bits (insn, 3, 6)])) | |
760 | { | |
761 | int rd = (bit (insn, 7) << 3) + bits (insn, 0, 2); | |
762 | int rm = bits (insn, 3, 6); | |
763 | regs[rd] = pv_add (regs[rd], regs[rm]); | |
764 | } | |
29d73ae4 | 765 | else if ((insn & 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */ |
da59e081 | 766 | { |
29d73ae4 DJ |
767 | int dst_reg = (insn & 0x7) + ((insn & 0x80) >> 4); |
768 | int src_reg = (insn & 0x78) >> 3; | |
769 | regs[dst_reg] = regs[src_reg]; | |
da59e081 | 770 | } |
29d73ae4 | 771 | else if ((insn & 0xf800) == 0x9000) /* str rd, [sp, #off] */ |
da59e081 | 772 | { |
29d73ae4 DJ |
773 | /* Handle stores to the stack. Normally pushes are used, |
774 | but with GCC -mtpcs-frame, there may be other stores | |
775 | in the prologue to create the frame. */ | |
776 | int regno = (insn >> 8) & 0x7; | |
777 | pv_t addr; | |
778 | ||
779 | offset = (insn & 0xff) << 2; | |
780 | addr = pv_add_constant (regs[ARM_SP_REGNUM], offset); | |
781 | ||
782 | if (pv_area_store_would_trash (stack, addr)) | |
783 | break; | |
784 | ||
785 | pv_area_store (stack, addr, 4, regs[regno]); | |
da59e081 | 786 | } |
0d39a070 DJ |
787 | else if ((insn & 0xf800) == 0x6000) /* str rd, [rn, #off] */ |
788 | { | |
789 | int rd = bits (insn, 0, 2); | |
790 | int rn = bits (insn, 3, 5); | |
791 | pv_t addr; | |
792 | ||
793 | offset = bits (insn, 6, 10) << 2; | |
794 | addr = pv_add_constant (regs[rn], offset); | |
795 | ||
796 | if (pv_area_store_would_trash (stack, addr)) | |
797 | break; | |
798 | ||
799 | pv_area_store (stack, addr, 4, regs[rd]); | |
800 | } | |
801 | else if (((insn & 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */ | |
802 | || (insn & 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */ | |
803 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) | |
804 | /* Ignore stores of argument registers to the stack. */ | |
805 | ; | |
806 | else if ((insn & 0xf800) == 0xc800 /* ldmia Rn!, { registers } */ | |
807 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) | |
808 | /* Ignore block loads from the stack, potentially copying | |
809 | parameters from memory. */ | |
810 | ; | |
811 | else if ((insn & 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */ | |
812 | || ((insn & 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */ | |
813 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM))) | |
814 | /* Similarly ignore single loads from the stack. */ | |
815 | ; | |
816 | else if ((insn & 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */ | |
817 | || (insn & 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */ | |
818 | /* Skip register copies, i.e. saves to another register | |
819 | instead of the stack. */ | |
820 | ; | |
821 | else if ((insn & 0xf800) == 0x2000) /* movs Rd, #imm */ | |
822 | /* Recognize constant loads; even with small stacks these are necessary | |
823 | on Thumb. */ | |
824 | regs[bits (insn, 8, 10)] = pv_constant (bits (insn, 0, 7)); | |
825 | else if ((insn & 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */ | |
826 | { | |
827 | /* Constant pool loads, for the same reason. */ | |
828 | unsigned int constant; | |
829 | CORE_ADDR loc; | |
830 | ||
831 | loc = start + 4 + bits (insn, 0, 7) * 4; | |
832 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
833 | regs[bits (insn, 8, 10)] = pv_constant (constant); | |
834 | } | |
ec3d575a | 835 | else if ((insn & 0xe000) == 0xe000) |
0d39a070 | 836 | { |
0d39a070 DJ |
837 | unsigned short inst2; |
838 | ||
839 | inst2 = read_memory_unsigned_integer (start + 2, 2, | |
840 | byte_order_for_code); | |
841 | ||
842 | if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800) | |
843 | { | |
844 | /* BL, BLX. Allow some special function calls when | |
845 | skipping the prologue; GCC generates these before | |
846 | storing arguments to the stack. */ | |
847 | CORE_ADDR nextpc; | |
848 | int j1, j2, imm1, imm2; | |
849 | ||
850 | imm1 = sbits (insn, 0, 10); | |
851 | imm2 = bits (inst2, 0, 10); | |
852 | j1 = bit (inst2, 13); | |
853 | j2 = bit (inst2, 11); | |
854 | ||
855 | offset = ((imm1 << 12) + (imm2 << 1)); | |
856 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
857 | ||
858 | nextpc = start + 4 + offset; | |
859 | /* For BLX make sure to clear the low bits. */ | |
860 | if (bit (inst2, 12) == 0) | |
861 | nextpc = nextpc & 0xfffffffc; | |
862 | ||
e0634ccf UW |
863 | if (!skip_prologue_function (gdbarch, nextpc, |
864 | bit (inst2, 12) != 0)) | |
0d39a070 DJ |
865 | break; |
866 | } | |
ec3d575a | 867 | |
0963b4bd MS |
868 | else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, |
869 | { registers } */ | |
ec3d575a UW |
870 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
871 | { | |
872 | pv_t addr = regs[bits (insn, 0, 3)]; | |
873 | int regno; | |
874 | ||
875 | if (pv_area_store_would_trash (stack, addr)) | |
876 | break; | |
877 | ||
878 | /* Calculate offsets of saved registers. */ | |
879 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) | |
880 | if (inst2 & (1 << regno)) | |
881 | { | |
882 | addr = pv_add_constant (addr, -4); | |
883 | pv_area_store (stack, addr, 4, regs[regno]); | |
884 | } | |
885 | ||
886 | if (insn & 0x0020) | |
887 | regs[bits (insn, 0, 3)] = addr; | |
888 | } | |
889 | ||
0963b4bd MS |
890 | else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, |
891 | [Rn, #+/-imm]{!} */ | |
ec3d575a UW |
892 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
893 | { | |
894 | int regno1 = bits (inst2, 12, 15); | |
895 | int regno2 = bits (inst2, 8, 11); | |
896 | pv_t addr = regs[bits (insn, 0, 3)]; | |
897 | ||
898 | offset = inst2 & 0xff; | |
899 | if (insn & 0x0080) | |
900 | addr = pv_add_constant (addr, offset); | |
901 | else | |
902 | addr = pv_add_constant (addr, -offset); | |
903 | ||
904 | if (pv_area_store_would_trash (stack, addr)) | |
905 | break; | |
906 | ||
907 | pv_area_store (stack, addr, 4, regs[regno1]); | |
908 | pv_area_store (stack, pv_add_constant (addr, 4), | |
909 | 4, regs[regno2]); | |
910 | ||
911 | if (insn & 0x0020) | |
912 | regs[bits (insn, 0, 3)] = addr; | |
913 | } | |
914 | ||
915 | else if ((insn & 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */ | |
916 | && (inst2 & 0x0c00) == 0x0c00 | |
917 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
918 | { | |
919 | int regno = bits (inst2, 12, 15); | |
920 | pv_t addr = regs[bits (insn, 0, 3)]; | |
921 | ||
922 | offset = inst2 & 0xff; | |
923 | if (inst2 & 0x0200) | |
924 | addr = pv_add_constant (addr, offset); | |
925 | else | |
926 | addr = pv_add_constant (addr, -offset); | |
927 | ||
928 | if (pv_area_store_would_trash (stack, addr)) | |
929 | break; | |
930 | ||
931 | pv_area_store (stack, addr, 4, regs[regno]); | |
932 | ||
933 | if (inst2 & 0x0100) | |
934 | regs[bits (insn, 0, 3)] = addr; | |
935 | } | |
936 | ||
937 | else if ((insn & 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */ | |
938 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
939 | { | |
940 | int regno = bits (inst2, 12, 15); | |
941 | pv_t addr; | |
942 | ||
943 | offset = inst2 & 0xfff; | |
944 | addr = pv_add_constant (regs[bits (insn, 0, 3)], offset); | |
945 | ||
946 | if (pv_area_store_would_trash (stack, addr)) | |
947 | break; | |
948 | ||
949 | pv_area_store (stack, addr, 4, regs[regno]); | |
950 | } | |
951 | ||
952 | else if ((insn & 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */ | |
0d39a070 | 953 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 954 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 955 | ; |
ec3d575a UW |
956 | |
957 | else if ((insn & 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */ | |
958 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 959 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 960 | /* Ignore stores of argument registers to the stack. */ |
0d39a070 | 961 | ; |
ec3d575a | 962 | |
0963b4bd MS |
963 | else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], |
964 | { registers } */ | |
ec3d575a UW |
965 | && (inst2 & 0x8000) == 0x0000 |
966 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) | |
967 | /* Ignore block loads from the stack, potentially copying | |
968 | parameters from memory. */ | |
0d39a070 | 969 | ; |
ec3d575a | 970 | |
0963b4bd MS |
971 | else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2, |
972 | [Rn, #+/-imm] */ | |
0d39a070 | 973 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 974 | /* Similarly ignore dual loads from the stack. */ |
0d39a070 | 975 | ; |
ec3d575a UW |
976 | |
977 | else if ((insn & 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */ | |
978 | && (inst2 & 0x0d00) == 0x0c00 | |
0d39a070 | 979 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 980 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 981 | ; |
ec3d575a UW |
982 | |
983 | else if ((insn & 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */ | |
0d39a070 | 984 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
ec3d575a | 985 | /* Similarly ignore single loads from the stack. */ |
0d39a070 | 986 | ; |
ec3d575a UW |
987 | |
988 | else if ((insn & 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */ | |
989 | && (inst2 & 0x8000) == 0x0000) | |
990 | { | |
991 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
992 | | (bits (inst2, 12, 14) << 8) | |
993 | | bits (inst2, 0, 7)); | |
994 | ||
995 | regs[bits (inst2, 8, 11)] | |
996 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
997 | thumb_expand_immediate (imm)); | |
998 | } | |
999 | ||
1000 | else if ((insn & 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */ | |
1001 | && (inst2 & 0x8000) == 0x0000) | |
0d39a070 | 1002 | { |
ec3d575a UW |
1003 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
1004 | | (bits (inst2, 12, 14) << 8) | |
1005 | | bits (inst2, 0, 7)); | |
1006 | ||
1007 | regs[bits (inst2, 8, 11)] | |
1008 | = pv_add_constant (regs[bits (insn, 0, 3)], imm); | |
1009 | } | |
1010 | ||
1011 | else if ((insn & 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */ | |
1012 | && (inst2 & 0x8000) == 0x0000) | |
1013 | { | |
1014 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1015 | | (bits (inst2, 12, 14) << 8) | |
1016 | | bits (inst2, 0, 7)); | |
1017 | ||
1018 | regs[bits (inst2, 8, 11)] | |
1019 | = pv_add_constant (regs[bits (insn, 0, 3)], | |
1020 | - (CORE_ADDR) thumb_expand_immediate (imm)); | |
1021 | } | |
1022 | ||
1023 | else if ((insn & 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */ | |
1024 | && (inst2 & 0x8000) == 0x0000) | |
1025 | { | |
1026 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1027 | | (bits (inst2, 12, 14) << 8) | |
1028 | | bits (inst2, 0, 7)); | |
1029 | ||
1030 | regs[bits (inst2, 8, 11)] | |
1031 | = pv_add_constant (regs[bits (insn, 0, 3)], - (CORE_ADDR) imm); | |
1032 | } | |
1033 | ||
1034 | else if ((insn & 0xfbff) == 0xf04f) /* mov.w Rd, #const */ | |
1035 | { | |
1036 | unsigned int imm = ((bits (insn, 10, 10) << 11) | |
1037 | | (bits (inst2, 12, 14) << 8) | |
1038 | | bits (inst2, 0, 7)); | |
1039 | ||
1040 | regs[bits (inst2, 8, 11)] | |
1041 | = pv_constant (thumb_expand_immediate (imm)); | |
1042 | } | |
1043 | ||
1044 | else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1045 | { | |
621c6d5b YQ |
1046 | unsigned int imm |
1047 | = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2); | |
ec3d575a UW |
1048 | |
1049 | regs[bits (inst2, 8, 11)] = pv_constant (imm); | |
1050 | } | |
1051 | ||
1052 | else if (insn == 0xea5f /* mov.w Rd,Rm */ | |
1053 | && (inst2 & 0xf0f0) == 0) | |
1054 | { | |
1055 | int dst_reg = (inst2 & 0x0f00) >> 8; | |
1056 | int src_reg = inst2 & 0xf; | |
1057 | regs[dst_reg] = regs[src_reg]; | |
1058 | } | |
1059 | ||
1060 | else if ((insn & 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */ | |
1061 | { | |
1062 | /* Constant pool loads. */ | |
1063 | unsigned int constant; | |
1064 | CORE_ADDR loc; | |
1065 | ||
1066 | offset = bits (insn, 0, 11); | |
1067 | if (insn & 0x0080) | |
1068 | loc = start + 4 + offset; | |
1069 | else | |
1070 | loc = start + 4 - offset; | |
1071 | ||
1072 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1073 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1074 | } | |
1075 | ||
1076 | else if ((insn & 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */ | |
1077 | { | |
1078 | /* Constant pool loads. */ | |
1079 | unsigned int constant; | |
1080 | CORE_ADDR loc; | |
1081 | ||
1082 | offset = bits (insn, 0, 7) << 2; | |
1083 | if (insn & 0x0080) | |
1084 | loc = start + 4 + offset; | |
1085 | else | |
1086 | loc = start + 4 - offset; | |
1087 | ||
1088 | constant = read_memory_unsigned_integer (loc, 4, byte_order); | |
1089 | regs[bits (inst2, 12, 15)] = pv_constant (constant); | |
1090 | ||
1091 | constant = read_memory_unsigned_integer (loc + 4, 4, byte_order); | |
1092 | regs[bits (inst2, 8, 11)] = pv_constant (constant); | |
1093 | } | |
1094 | ||
1095 | else if (thumb2_instruction_changes_pc (insn, inst2)) | |
1096 | { | |
1097 | /* Don't scan past anything that might change control flow. */ | |
0d39a070 DJ |
1098 | break; |
1099 | } | |
ec3d575a UW |
1100 | else |
1101 | { | |
1102 | /* The optimizer might shove anything into the prologue, | |
1103 | so we just skip what we don't recognize. */ | |
1104 | unrecognized_pc = start; | |
1105 | } | |
0d39a070 DJ |
1106 | |
1107 | start += 2; | |
1108 | } | |
ec3d575a | 1109 | else if (thumb_instruction_changes_pc (insn)) |
3d74b771 | 1110 | { |
ec3d575a | 1111 | /* Don't scan past anything that might change control flow. */ |
da3c6d4a | 1112 | break; |
3d74b771 | 1113 | } |
ec3d575a UW |
1114 | else |
1115 | { | |
1116 | /* The optimizer might shove anything into the prologue, | |
1117 | so we just skip what we don't recognize. */ | |
1118 | unrecognized_pc = start; | |
1119 | } | |
29d73ae4 DJ |
1120 | |
1121 | start += 2; | |
c906108c SS |
1122 | } |
1123 | ||
0d39a070 DJ |
1124 | if (arm_debug) |
1125 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1126 | paddress (gdbarch, start)); | |
1127 | ||
ec3d575a UW |
1128 | if (unrecognized_pc == 0) |
1129 | unrecognized_pc = start; | |
1130 | ||
29d73ae4 DJ |
1131 | if (cache == NULL) |
1132 | { | |
1133 | do_cleanups (back_to); | |
ec3d575a | 1134 | return unrecognized_pc; |
29d73ae4 DJ |
1135 | } |
1136 | ||
29d73ae4 DJ |
1137 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
1138 | { | |
1139 | /* Frame pointer is fp. Frame size is constant. */ | |
1140 | cache->framereg = ARM_FP_REGNUM; | |
1141 | cache->framesize = -regs[ARM_FP_REGNUM].k; | |
1142 | } | |
1143 | else if (pv_is_register (regs[THUMB_FP_REGNUM], ARM_SP_REGNUM)) | |
1144 | { | |
1145 | /* Frame pointer is r7. Frame size is constant. */ | |
1146 | cache->framereg = THUMB_FP_REGNUM; | |
1147 | cache->framesize = -regs[THUMB_FP_REGNUM].k; | |
1148 | } | |
1149 | else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM)) | |
1150 | { | |
1151 | /* Try the stack pointer... this is a bit desperate. */ | |
1152 | cache->framereg = ARM_SP_REGNUM; | |
1153 | cache->framesize = -regs[ARM_SP_REGNUM].k; | |
1154 | } | |
1155 | else | |
1156 | { | |
1157 | /* We're just out of luck. We don't know where the frame is. */ | |
1158 | cache->framereg = -1; | |
1159 | cache->framesize = 0; | |
1160 | } | |
1161 | ||
1162 | for (i = 0; i < 16; i++) | |
1163 | if (pv_area_find_reg (stack, gdbarch, i, &offset)) | |
1164 | cache->saved_regs[i].addr = offset; | |
1165 | ||
1166 | do_cleanups (back_to); | |
ec3d575a | 1167 | return unrecognized_pc; |
c906108c SS |
1168 | } |
1169 | ||
621c6d5b YQ |
1170 | |
1171 | /* Try to analyze the instructions starting from PC, which load symbol | |
1172 | __stack_chk_guard. Return the address of instruction after loading this | |
1173 | symbol, set the dest register number to *BASEREG, and set the size of | |
1174 | instructions for loading symbol in OFFSET. Return 0 if instructions are | |
1175 | not recognized. */ | |
1176 | ||
1177 | static CORE_ADDR | |
1178 | arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch, | |
1179 | unsigned int *destreg, int *offset) | |
1180 | { | |
1181 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1182 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1183 | unsigned int low, high, address; | |
1184 | ||
1185 | address = 0; | |
1186 | if (is_thumb) | |
1187 | { | |
1188 | unsigned short insn1 | |
1189 | = read_memory_unsigned_integer (pc, 2, byte_order_for_code); | |
1190 | ||
1191 | if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */ | |
1192 | { | |
1193 | *destreg = bits (insn1, 8, 10); | |
1194 | *offset = 2; | |
1195 | address = bits (insn1, 0, 7); | |
1196 | } | |
1197 | else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */ | |
1198 | { | |
1199 | unsigned short insn2 | |
1200 | = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
1201 | ||
1202 | low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1203 | ||
1204 | insn1 | |
1205 | = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code); | |
1206 | insn2 | |
1207 | = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code); | |
1208 | ||
1209 | /* movt Rd, #const */ | |
1210 | if ((insn1 & 0xfbc0) == 0xf2c0) | |
1211 | { | |
1212 | high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); | |
1213 | *destreg = bits (insn2, 8, 11); | |
1214 | *offset = 8; | |
1215 | address = (high << 16 | low); | |
1216 | } | |
1217 | } | |
1218 | } | |
1219 | else | |
1220 | { | |
2e9e421f UW |
1221 | unsigned int insn |
1222 | = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
1223 | ||
1224 | if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, #immed */ | |
1225 | { | |
1226 | address = bits (insn, 0, 11); | |
1227 | *destreg = bits (insn, 12, 15); | |
1228 | *offset = 4; | |
1229 | } | |
1230 | else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */ | |
1231 | { | |
1232 | low = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1233 | ||
1234 | insn | |
1235 | = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code); | |
1236 | ||
1237 | if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */ | |
1238 | { | |
1239 | high = EXTRACT_MOVW_MOVT_IMM_A (insn); | |
1240 | *destreg = bits (insn, 12, 15); | |
1241 | *offset = 8; | |
1242 | address = (high << 16 | low); | |
1243 | } | |
1244 | } | |
621c6d5b YQ |
1245 | } |
1246 | ||
1247 | return address; | |
1248 | } | |
1249 | ||
1250 | /* Try to skip a sequence of instructions used for stack protector. If PC | |
0963b4bd MS |
1251 | points to the first instruction of this sequence, return the address of |
1252 | first instruction after this sequence, otherwise, return original PC. | |
621c6d5b YQ |
1253 | |
1254 | On arm, this sequence of instructions is composed of mainly three steps, | |
1255 | Step 1: load symbol __stack_chk_guard, | |
1256 | Step 2: load from address of __stack_chk_guard, | |
1257 | Step 3: store it to somewhere else. | |
1258 | ||
1259 | Usually, instructions on step 2 and step 3 are the same on various ARM | |
1260 | architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and | |
1261 | on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However, | |
1262 | instructions in step 1 vary from different ARM architectures. On ARMv7, | |
1263 | they are, | |
1264 | ||
1265 | movw Rn, #:lower16:__stack_chk_guard | |
1266 | movt Rn, #:upper16:__stack_chk_guard | |
1267 | ||
1268 | On ARMv5t, it is, | |
1269 | ||
1270 | ldr Rn, .Label | |
1271 | .... | |
1272 | .Lable: | |
1273 | .word __stack_chk_guard | |
1274 | ||
1275 | Since ldr/str is a very popular instruction, we can't use them as | |
1276 | 'fingerprint' or 'signature' of stack protector sequence. Here we choose | |
1277 | sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not | |
1278 | stripped, as the 'fingerprint' of a stack protector cdoe sequence. */ | |
1279 | ||
1280 | static CORE_ADDR | |
1281 | arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch) | |
1282 | { | |
1283 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
1284 | unsigned int address, basereg; | |
1285 | struct minimal_symbol *stack_chk_guard; | |
1286 | int offset; | |
1287 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); | |
1288 | CORE_ADDR addr; | |
1289 | ||
1290 | /* Try to parse the instructions in Step 1. */ | |
1291 | addr = arm_analyze_load_stack_chk_guard (pc, gdbarch, | |
1292 | &basereg, &offset); | |
1293 | if (!addr) | |
1294 | return pc; | |
1295 | ||
1296 | stack_chk_guard = lookup_minimal_symbol_by_pc (addr); | |
1297 | /* If name of symbol doesn't start with '__stack_chk_guard', this | |
1298 | instruction sequence is not for stack protector. If symbol is | |
1299 | removed, we conservatively think this sequence is for stack protector. */ | |
1300 | if (stack_chk_guard | |
c1c2ab58 UW |
1301 | && strncmp (SYMBOL_LINKAGE_NAME (stack_chk_guard), "__stack_chk_guard", |
1302 | strlen ("__stack_chk_guard")) != 0) | |
621c6d5b YQ |
1303 | return pc; |
1304 | ||
1305 | if (is_thumb) | |
1306 | { | |
1307 | unsigned int destreg; | |
1308 | unsigned short insn | |
1309 | = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code); | |
1310 | ||
1311 | /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */ | |
1312 | if ((insn & 0xf800) != 0x6800) | |
1313 | return pc; | |
1314 | if (bits (insn, 3, 5) != basereg) | |
1315 | return pc; | |
1316 | destreg = bits (insn, 0, 2); | |
1317 | ||
1318 | insn = read_memory_unsigned_integer (pc + offset + 2, 2, | |
1319 | byte_order_for_code); | |
1320 | /* Step 3: str Rd, [Rn, #immed], encoding T1. */ | |
1321 | if ((insn & 0xf800) != 0x6000) | |
1322 | return pc; | |
1323 | if (destreg != bits (insn, 0, 2)) | |
1324 | return pc; | |
1325 | } | |
1326 | else | |
1327 | { | |
1328 | unsigned int destreg; | |
1329 | unsigned int insn | |
1330 | = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code); | |
1331 | ||
1332 | /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */ | |
1333 | if ((insn & 0x0e500000) != 0x04100000) | |
1334 | return pc; | |
1335 | if (bits (insn, 16, 19) != basereg) | |
1336 | return pc; | |
1337 | destreg = bits (insn, 12, 15); | |
1338 | /* Step 3: str Rd, [Rn, #immed], encoding A1. */ | |
1339 | insn = read_memory_unsigned_integer (pc + offset + 4, | |
1340 | 4, byte_order_for_code); | |
1341 | if ((insn & 0x0e500000) != 0x04000000) | |
1342 | return pc; | |
1343 | if (bits (insn, 12, 15) != destreg) | |
1344 | return pc; | |
1345 | } | |
1346 | /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8 | |
1347 | on arm. */ | |
1348 | if (is_thumb) | |
1349 | return pc + offset + 4; | |
1350 | else | |
1351 | return pc + offset + 8; | |
1352 | } | |
1353 | ||
da3c6d4a MS |
1354 | /* Advance the PC across any function entry prologue instructions to |
1355 | reach some "real" code. | |
34e8f22d RE |
1356 | |
1357 | The APCS (ARM Procedure Call Standard) defines the following | |
ed9a39eb | 1358 | prologue: |
c906108c | 1359 | |
c5aa993b JM |
1360 | mov ip, sp |
1361 | [stmfd sp!, {a1,a2,a3,a4}] | |
1362 | stmfd sp!, {...,fp,ip,lr,pc} | |
ed9a39eb JM |
1363 | [stfe f7, [sp, #-12]!] |
1364 | [stfe f6, [sp, #-12]!] | |
1365 | [stfe f5, [sp, #-12]!] | |
1366 | [stfe f4, [sp, #-12]!] | |
0963b4bd | 1367 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */ |
c906108c | 1368 | |
34e8f22d | 1369 | static CORE_ADDR |
6093d2eb | 1370 | arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
c906108c | 1371 | { |
e17a4113 | 1372 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
c906108c SS |
1373 | unsigned long inst; |
1374 | CORE_ADDR skip_pc; | |
a89fea3c | 1375 | CORE_ADDR func_addr, limit_pc; |
c906108c SS |
1376 | struct symtab_and_line sal; |
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 | |
1401 | || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0)) | |
1402 | return post_prologue_pc; | |
1403 | ||
a89fea3c | 1404 | if (post_prologue_pc != 0) |
0d39a070 DJ |
1405 | { |
1406 | CORE_ADDR analyzed_limit; | |
1407 | ||
1408 | /* For non-GCC compilers, make sure the entire line is an | |
1409 | acceptable prologue; GDB will round this function's | |
1410 | return value up to the end of the following line so we | |
1411 | can not skip just part of a line (and we do not want to). | |
1412 | ||
1413 | RealView does not treat the prologue specially, but does | |
1414 | associate prologue code with the opening brace; so this | |
1415 | lets us skip the first line if we think it is the opening | |
1416 | brace. */ | |
9779414d | 1417 | if (arm_pc_is_thumb (gdbarch, func_addr)) |
0d39a070 DJ |
1418 | analyzed_limit = thumb_analyze_prologue (gdbarch, func_addr, |
1419 | post_prologue_pc, NULL); | |
1420 | else | |
1421 | analyzed_limit = arm_analyze_prologue (gdbarch, func_addr, | |
1422 | post_prologue_pc, NULL); | |
1423 | ||
1424 | if (analyzed_limit != post_prologue_pc) | |
1425 | return func_addr; | |
1426 | ||
1427 | return post_prologue_pc; | |
1428 | } | |
c906108c SS |
1429 | } |
1430 | ||
a89fea3c JL |
1431 | /* Can't determine prologue from the symbol table, need to examine |
1432 | instructions. */ | |
c906108c | 1433 | |
a89fea3c JL |
1434 | /* Find an upper limit on the function prologue using the debug |
1435 | information. If the debug information could not be used to provide | |
1436 | that bound, then use an arbitrary large number as the upper bound. */ | |
0963b4bd | 1437 | /* Like arm_scan_prologue, stop no later than pc + 64. */ |
d80b854b | 1438 | limit_pc = skip_prologue_using_sal (gdbarch, pc); |
a89fea3c JL |
1439 | if (limit_pc == 0) |
1440 | limit_pc = pc + 64; /* Magic. */ | |
1441 | ||
c906108c | 1442 | |
29d73ae4 | 1443 | /* Check if this is Thumb code. */ |
9779414d | 1444 | if (arm_pc_is_thumb (gdbarch, pc)) |
a89fea3c | 1445 | return thumb_analyze_prologue (gdbarch, pc, limit_pc, NULL); |
29d73ae4 | 1446 | |
a89fea3c | 1447 | for (skip_pc = pc; skip_pc < limit_pc; skip_pc += 4) |
f43845b3 | 1448 | { |
e17a4113 | 1449 | inst = read_memory_unsigned_integer (skip_pc, 4, byte_order_for_code); |
9d4fde75 | 1450 | |
b8d5e71d MS |
1451 | /* "mov ip, sp" is no longer a required part of the prologue. */ |
1452 | if (inst == 0xe1a0c00d) /* mov ip, sp */ | |
1453 | continue; | |
c906108c | 1454 | |
28cd8767 JG |
1455 | if ((inst & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */ |
1456 | continue; | |
1457 | ||
1458 | if ((inst & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */ | |
1459 | continue; | |
1460 | ||
b8d5e71d MS |
1461 | /* Some prologues begin with "str lr, [sp, #-4]!". */ |
1462 | if (inst == 0xe52de004) /* str lr, [sp, #-4]! */ | |
1463 | continue; | |
c906108c | 1464 | |
b8d5e71d MS |
1465 | if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */ |
1466 | continue; | |
c906108c | 1467 | |
b8d5e71d MS |
1468 | if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */ |
1469 | continue; | |
11d3b27d | 1470 | |
b8d5e71d MS |
1471 | /* Any insns after this point may float into the code, if it makes |
1472 | for better instruction scheduling, so we skip them only if we | |
1473 | find them, but still consider the function to be frame-ful. */ | |
f43845b3 | 1474 | |
b8d5e71d MS |
1475 | /* We may have either one sfmfd instruction here, or several stfe |
1476 | insns, depending on the version of floating point code we | |
1477 | support. */ | |
1478 | if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */ | |
1479 | continue; | |
1480 | ||
1481 | if ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */ | |
1482 | continue; | |
1483 | ||
1484 | if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */ | |
1485 | continue; | |
1486 | ||
1487 | if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */ | |
1488 | continue; | |
1489 | ||
f8bf5763 PM |
1490 | if ((inst & 0xffffc000) == 0xe54b0000 /* strb r(0123),[r11,#-nn] */ |
1491 | || (inst & 0xffffc0f0) == 0xe14b00b0 /* strh r(0123),[r11,#-nn] */ | |
1492 | || (inst & 0xffffc000) == 0xe50b0000) /* str r(0123),[r11,#-nn] */ | |
b8d5e71d MS |
1493 | continue; |
1494 | ||
f8bf5763 PM |
1495 | if ((inst & 0xffffc000) == 0xe5cd0000 /* strb r(0123),[sp,#nn] */ |
1496 | || (inst & 0xffffc0f0) == 0xe1cd00b0 /* strh r(0123),[sp,#nn] */ | |
1497 | || (inst & 0xffffc000) == 0xe58d0000) /* str r(0123),[sp,#nn] */ | |
b8d5e71d MS |
1498 | continue; |
1499 | ||
1500 | /* Un-recognized instruction; stop scanning. */ | |
1501 | break; | |
f43845b3 | 1502 | } |
c906108c | 1503 | |
0963b4bd | 1504 | return skip_pc; /* End of prologue. */ |
c906108c | 1505 | } |
94c30b78 | 1506 | |
c5aa993b | 1507 | /* *INDENT-OFF* */ |
c906108c SS |
1508 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
1509 | This function decodes a Thumb function prologue to determine: | |
1510 | 1) the size of the stack frame | |
1511 | 2) which registers are saved on it | |
1512 | 3) the offsets of saved regs | |
1513 | 4) the offset from the stack pointer to the frame pointer | |
c906108c | 1514 | |
da59e081 JM |
1515 | A typical Thumb function prologue would create this stack frame |
1516 | (offsets relative to FP) | |
c906108c SS |
1517 | old SP -> 24 stack parameters |
1518 | 20 LR | |
1519 | 16 R7 | |
1520 | R7 -> 0 local variables (16 bytes) | |
1521 | SP -> -12 additional stack space (12 bytes) | |
1522 | The frame size would thus be 36 bytes, and the frame offset would be | |
0963b4bd | 1523 | 12 bytes. The frame register is R7. |
da59e081 | 1524 | |
da3c6d4a MS |
1525 | The comments for thumb_skip_prolog() describe the algorithm we use |
1526 | to detect the end of the prolog. */ | |
c5aa993b JM |
1527 | /* *INDENT-ON* */ |
1528 | ||
c906108c | 1529 | static void |
be8626e0 | 1530 | thumb_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR prev_pc, |
b39cc962 | 1531 | CORE_ADDR block_addr, struct arm_prologue_cache *cache) |
c906108c SS |
1532 | { |
1533 | CORE_ADDR prologue_start; | |
1534 | CORE_ADDR prologue_end; | |
1535 | CORE_ADDR current_pc; | |
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 DJ |
1879 | } |
1880 | else if (pv_is_register (regs[ARM_SP_REGNUM], ARM_SP_REGNUM)) | |
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 | } |
d4473757 | 1886 | else |
4be43953 DJ |
1887 | { |
1888 | /* We're just out of luck. We don't know where the frame is. */ | |
0d39a070 DJ |
1889 | framereg = -1; |
1890 | framesize = 0; | |
4be43953 DJ |
1891 | } |
1892 | ||
0d39a070 DJ |
1893 | if (cache) |
1894 | { | |
1895 | cache->framereg = framereg; | |
1896 | cache->framesize = framesize; | |
1897 | ||
1898 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) | |
1899 | if (pv_area_find_reg (stack, gdbarch, regno, &offset)) | |
1900 | cache->saved_regs[regno].addr = offset; | |
1901 | } | |
1902 | ||
1903 | if (arm_debug) | |
1904 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", | |
1905 | paddress (gdbarch, unrecognized_pc)); | |
4be43953 DJ |
1906 | |
1907 | do_cleanups (back_to); | |
0d39a070 DJ |
1908 | return unrecognized_pc; |
1909 | } | |
1910 | ||
1911 | static void | |
1912 | arm_scan_prologue (struct frame_info *this_frame, | |
1913 | struct arm_prologue_cache *cache) | |
1914 | { | |
1915 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1916 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1917 | int regno; | |
1918 | CORE_ADDR prologue_start, prologue_end, current_pc; | |
1919 | CORE_ADDR prev_pc = get_frame_pc (this_frame); | |
1920 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); | |
1921 | pv_t regs[ARM_FPS_REGNUM]; | |
1922 | struct pv_area *stack; | |
1923 | struct cleanup *back_to; | |
1924 | CORE_ADDR offset; | |
1925 | ||
1926 | /* Assume there is no frame until proven otherwise. */ | |
1927 | cache->framereg = ARM_SP_REGNUM; | |
1928 | cache->framesize = 0; | |
1929 | ||
1930 | /* Check for Thumb prologue. */ | |
1931 | if (arm_frame_is_thumb (this_frame)) | |
1932 | { | |
1933 | thumb_scan_prologue (gdbarch, prev_pc, block_addr, cache); | |
1934 | return; | |
1935 | } | |
1936 | ||
1937 | /* Find the function prologue. If we can't find the function in | |
1938 | the symbol table, peek in the stack frame to find the PC. */ | |
1939 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, | |
1940 | &prologue_end)) | |
1941 | { | |
1942 | /* One way to find the end of the prologue (which works well | |
1943 | for unoptimized code) is to do the following: | |
1944 | ||
1945 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); | |
1946 | ||
1947 | if (sal.line == 0) | |
1948 | prologue_end = prev_pc; | |
1949 | else if (sal.end < prologue_end) | |
1950 | prologue_end = sal.end; | |
1951 | ||
1952 | This mechanism is very accurate so long as the optimizer | |
1953 | doesn't move any instructions from the function body into the | |
1954 | prologue. If this happens, sal.end will be the last | |
1955 | instruction in the first hunk of prologue code just before | |
1956 | the first instruction that the scheduler has moved from | |
1957 | the body to the prologue. | |
1958 | ||
1959 | In order to make sure that we scan all of the prologue | |
1960 | instructions, we use a slightly less accurate mechanism which | |
1961 | may scan more than necessary. To help compensate for this | |
1962 | lack of accuracy, the prologue scanning loop below contains | |
1963 | several clauses which'll cause the loop to terminate early if | |
1964 | an implausible prologue instruction is encountered. | |
1965 | ||
1966 | The expression | |
1967 | ||
1968 | prologue_start + 64 | |
1969 | ||
1970 | is a suitable endpoint since it accounts for the largest | |
1971 | possible prologue plus up to five instructions inserted by | |
1972 | the scheduler. */ | |
1973 | ||
1974 | if (prologue_end > prologue_start + 64) | |
1975 | { | |
1976 | prologue_end = prologue_start + 64; /* See above. */ | |
1977 | } | |
1978 | } | |
1979 | else | |
1980 | { | |
1981 | /* We have no symbol information. Our only option is to assume this | |
1982 | function has a standard stack frame and the normal frame register. | |
1983 | Then, we can find the value of our frame pointer on entrance to | |
1984 | the callee (or at the present moment if this is the innermost frame). | |
1985 | The value stored there should be the address of the stmfd + 8. */ | |
1986 | CORE_ADDR frame_loc; | |
1987 | LONGEST return_value; | |
1988 | ||
1989 | frame_loc = get_frame_register_unsigned (this_frame, ARM_FP_REGNUM); | |
1990 | if (!safe_read_memory_integer (frame_loc, 4, byte_order, &return_value)) | |
1991 | return; | |
1992 | else | |
1993 | { | |
1994 | prologue_start = gdbarch_addr_bits_remove | |
1995 | (gdbarch, return_value) - 8; | |
1996 | prologue_end = prologue_start + 64; /* See above. */ | |
1997 | } | |
1998 | } | |
1999 | ||
2000 | if (prev_pc < prologue_end) | |
2001 | prologue_end = prev_pc; | |
2002 | ||
2003 | arm_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); | |
c906108c SS |
2004 | } |
2005 | ||
eb5492fa | 2006 | static struct arm_prologue_cache * |
a262aec2 | 2007 | arm_make_prologue_cache (struct frame_info *this_frame) |
c906108c | 2008 | { |
eb5492fa DJ |
2009 | int reg; |
2010 | struct arm_prologue_cache *cache; | |
2011 | CORE_ADDR unwound_fp; | |
c5aa993b | 2012 | |
35d5d4ee | 2013 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2014 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
c906108c | 2015 | |
a262aec2 | 2016 | arm_scan_prologue (this_frame, cache); |
848cfffb | 2017 | |
a262aec2 | 2018 | unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); |
eb5492fa DJ |
2019 | if (unwound_fp == 0) |
2020 | return cache; | |
c906108c | 2021 | |
4be43953 | 2022 | cache->prev_sp = unwound_fp + cache->framesize; |
c906108c | 2023 | |
eb5492fa DJ |
2024 | /* Calculate actual addresses of saved registers using offsets |
2025 | determined by arm_scan_prologue. */ | |
a262aec2 | 2026 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) |
e28a332c | 2027 | if (trad_frame_addr_p (cache->saved_regs, reg)) |
eb5492fa DJ |
2028 | cache->saved_regs[reg].addr += cache->prev_sp; |
2029 | ||
2030 | return cache; | |
c906108c SS |
2031 | } |
2032 | ||
eb5492fa DJ |
2033 | /* Our frame ID for a normal frame is the current function's starting PC |
2034 | and the caller's SP when we were called. */ | |
c906108c | 2035 | |
148754e5 | 2036 | static void |
a262aec2 | 2037 | arm_prologue_this_id (struct frame_info *this_frame, |
eb5492fa DJ |
2038 | void **this_cache, |
2039 | struct frame_id *this_id) | |
c906108c | 2040 | { |
eb5492fa DJ |
2041 | struct arm_prologue_cache *cache; |
2042 | struct frame_id id; | |
2c404490 | 2043 | CORE_ADDR pc, func; |
f079148d | 2044 | |
eb5492fa | 2045 | if (*this_cache == NULL) |
a262aec2 | 2046 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2047 | cache = *this_cache; |
2a451106 | 2048 | |
2c404490 DJ |
2049 | /* This is meant to halt the backtrace at "_start". */ |
2050 | pc = get_frame_pc (this_frame); | |
2051 | if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) | |
eb5492fa | 2052 | return; |
5a203e44 | 2053 | |
eb5492fa DJ |
2054 | /* If we've hit a wall, stop. */ |
2055 | if (cache->prev_sp == 0) | |
2056 | return; | |
24de872b | 2057 | |
0e9e9abd UW |
2058 | /* Use function start address as part of the frame ID. If we cannot |
2059 | identify the start address (due to missing symbol information), | |
2060 | fall back to just using the current PC. */ | |
2c404490 | 2061 | func = get_frame_func (this_frame); |
0e9e9abd UW |
2062 | if (!func) |
2063 | func = pc; | |
2064 | ||
eb5492fa | 2065 | id = frame_id_build (cache->prev_sp, func); |
eb5492fa | 2066 | *this_id = id; |
c906108c SS |
2067 | } |
2068 | ||
a262aec2 DJ |
2069 | static struct value * |
2070 | arm_prologue_prev_register (struct frame_info *this_frame, | |
eb5492fa | 2071 | void **this_cache, |
a262aec2 | 2072 | int prev_regnum) |
24de872b | 2073 | { |
24568a2c | 2074 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
24de872b DJ |
2075 | struct arm_prologue_cache *cache; |
2076 | ||
eb5492fa | 2077 | if (*this_cache == NULL) |
a262aec2 | 2078 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa | 2079 | cache = *this_cache; |
24de872b | 2080 | |
eb5492fa | 2081 | /* If we are asked to unwind the PC, then we need to return the LR |
b39cc962 DJ |
2082 | instead. The prologue may save PC, but it will point into this |
2083 | frame's prologue, not the next frame's resume location. Also | |
2084 | strip the saved T bit. A valid LR may have the low bit set, but | |
2085 | a valid PC never does. */ | |
eb5492fa | 2086 | if (prev_regnum == ARM_PC_REGNUM) |
b39cc962 DJ |
2087 | { |
2088 | CORE_ADDR lr; | |
2089 | ||
2090 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2091 | return frame_unwind_got_constant (this_frame, prev_regnum, | |
24568a2c | 2092 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 | 2093 | } |
24de872b | 2094 | |
eb5492fa | 2095 | /* SP is generally not saved to the stack, but this frame is |
a262aec2 | 2096 | identified by the next frame's stack pointer at the time of the call. |
eb5492fa DJ |
2097 | The value was already reconstructed into PREV_SP. */ |
2098 | if (prev_regnum == ARM_SP_REGNUM) | |
a262aec2 | 2099 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
eb5492fa | 2100 | |
b39cc962 DJ |
2101 | /* The CPSR may have been changed by the call instruction and by the |
2102 | called function. The only bit we can reconstruct is the T bit, | |
2103 | by checking the low bit of LR as of the call. This is a reliable | |
2104 | indicator of Thumb-ness except for some ARM v4T pre-interworking | |
2105 | Thumb code, which could get away with a clear low bit as long as | |
2106 | the called function did not use bx. Guess that all other | |
2107 | bits are unchanged; the condition flags are presumably lost, | |
2108 | but the processor status is likely valid. */ | |
2109 | if (prev_regnum == ARM_PS_REGNUM) | |
2110 | { | |
2111 | CORE_ADDR lr, cpsr; | |
9779414d | 2112 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
2113 | |
2114 | cpsr = get_frame_register_unsigned (this_frame, prev_regnum); | |
2115 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2116 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 2117 | cpsr |= t_bit; |
b39cc962 | 2118 | else |
9779414d | 2119 | cpsr &= ~t_bit; |
b39cc962 DJ |
2120 | return frame_unwind_got_constant (this_frame, prev_regnum, cpsr); |
2121 | } | |
2122 | ||
a262aec2 DJ |
2123 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
2124 | prev_regnum); | |
eb5492fa DJ |
2125 | } |
2126 | ||
2127 | struct frame_unwind arm_prologue_unwind = { | |
2128 | NORMAL_FRAME, | |
8fbca658 | 2129 | default_frame_unwind_stop_reason, |
eb5492fa | 2130 | arm_prologue_this_id, |
a262aec2 DJ |
2131 | arm_prologue_prev_register, |
2132 | NULL, | |
2133 | default_frame_sniffer | |
eb5492fa DJ |
2134 | }; |
2135 | ||
0e9e9abd UW |
2136 | /* Maintain a list of ARM exception table entries per objfile, similar to the |
2137 | list of mapping symbols. We only cache entries for standard ARM-defined | |
2138 | personality routines; the cache will contain only the frame unwinding | |
2139 | instructions associated with the entry (not the descriptors). */ | |
2140 | ||
2141 | static const struct objfile_data *arm_exidx_data_key; | |
2142 | ||
2143 | struct arm_exidx_entry | |
2144 | { | |
2145 | bfd_vma addr; | |
2146 | gdb_byte *entry; | |
2147 | }; | |
2148 | typedef struct arm_exidx_entry arm_exidx_entry_s; | |
2149 | DEF_VEC_O(arm_exidx_entry_s); | |
2150 | ||
2151 | struct arm_exidx_data | |
2152 | { | |
2153 | VEC(arm_exidx_entry_s) **section_maps; | |
2154 | }; | |
2155 | ||
2156 | static void | |
2157 | arm_exidx_data_free (struct objfile *objfile, void *arg) | |
2158 | { | |
2159 | struct arm_exidx_data *data = arg; | |
2160 | unsigned int i; | |
2161 | ||
2162 | for (i = 0; i < objfile->obfd->section_count; i++) | |
2163 | VEC_free (arm_exidx_entry_s, data->section_maps[i]); | |
2164 | } | |
2165 | ||
2166 | static inline int | |
2167 | arm_compare_exidx_entries (const struct arm_exidx_entry *lhs, | |
2168 | const struct arm_exidx_entry *rhs) | |
2169 | { | |
2170 | return lhs->addr < rhs->addr; | |
2171 | } | |
2172 | ||
2173 | static struct obj_section * | |
2174 | arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma) | |
2175 | { | |
2176 | struct obj_section *osect; | |
2177 | ||
2178 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
2179 | if (bfd_get_section_flags (objfile->obfd, | |
2180 | osect->the_bfd_section) & SEC_ALLOC) | |
2181 | { | |
2182 | bfd_vma start, size; | |
2183 | start = bfd_get_section_vma (objfile->obfd, osect->the_bfd_section); | |
2184 | size = bfd_get_section_size (osect->the_bfd_section); | |
2185 | ||
2186 | if (start <= vma && vma < start + size) | |
2187 | return osect; | |
2188 | } | |
2189 | ||
2190 | return NULL; | |
2191 | } | |
2192 | ||
2193 | /* Parse contents of exception table and exception index sections | |
2194 | of OBJFILE, and fill in the exception table entry cache. | |
2195 | ||
2196 | For each entry that refers to a standard ARM-defined personality | |
2197 | routine, extract the frame unwinding instructions (from either | |
2198 | the index or the table section). The unwinding instructions | |
2199 | are normalized by: | |
2200 | - extracting them from the rest of the table data | |
2201 | - converting to host endianness | |
2202 | - appending the implicit 0xb0 ("Finish") code | |
2203 | ||
2204 | The extracted and normalized instructions are stored for later | |
2205 | retrieval by the arm_find_exidx_entry routine. */ | |
2206 | ||
2207 | static void | |
2208 | arm_exidx_new_objfile (struct objfile *objfile) | |
2209 | { | |
2210 | struct cleanup *cleanups = make_cleanup (null_cleanup, NULL); | |
2211 | struct arm_exidx_data *data; | |
2212 | asection *exidx, *extab; | |
2213 | bfd_vma exidx_vma = 0, extab_vma = 0; | |
2214 | bfd_size_type exidx_size = 0, extab_size = 0; | |
2215 | gdb_byte *exidx_data = NULL, *extab_data = NULL; | |
2216 | LONGEST i; | |
2217 | ||
2218 | /* If we've already touched this file, do nothing. */ | |
2219 | if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL) | |
2220 | return; | |
2221 | ||
2222 | /* Read contents of exception table and index. */ | |
2223 | exidx = bfd_get_section_by_name (objfile->obfd, ".ARM.exidx"); | |
2224 | if (exidx) | |
2225 | { | |
2226 | exidx_vma = bfd_section_vma (objfile->obfd, exidx); | |
2227 | exidx_size = bfd_get_section_size (exidx); | |
2228 | exidx_data = xmalloc (exidx_size); | |
2229 | make_cleanup (xfree, exidx_data); | |
2230 | ||
2231 | if (!bfd_get_section_contents (objfile->obfd, exidx, | |
2232 | exidx_data, 0, exidx_size)) | |
2233 | { | |
2234 | do_cleanups (cleanups); | |
2235 | return; | |
2236 | } | |
2237 | } | |
2238 | ||
2239 | extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab"); | |
2240 | if (extab) | |
2241 | { | |
2242 | extab_vma = bfd_section_vma (objfile->obfd, extab); | |
2243 | extab_size = bfd_get_section_size (extab); | |
2244 | extab_data = xmalloc (extab_size); | |
2245 | make_cleanup (xfree, extab_data); | |
2246 | ||
2247 | if (!bfd_get_section_contents (objfile->obfd, extab, | |
2248 | extab_data, 0, extab_size)) | |
2249 | { | |
2250 | do_cleanups (cleanups); | |
2251 | return; | |
2252 | } | |
2253 | } | |
2254 | ||
2255 | /* Allocate exception table data structure. */ | |
2256 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct arm_exidx_data); | |
2257 | set_objfile_data (objfile, arm_exidx_data_key, data); | |
2258 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
2259 | objfile->obfd->section_count, | |
2260 | VEC(arm_exidx_entry_s) *); | |
2261 | ||
2262 | /* Fill in exception table. */ | |
2263 | for (i = 0; i < exidx_size / 8; i++) | |
2264 | { | |
2265 | struct arm_exidx_entry new_exidx_entry; | |
2266 | bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8); | |
2267 | bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4); | |
2268 | bfd_vma addr = 0, word = 0; | |
2269 | int n_bytes = 0, n_words = 0; | |
2270 | struct obj_section *sec; | |
2271 | gdb_byte *entry = NULL; | |
2272 | ||
2273 | /* Extract address of start of function. */ | |
2274 | idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2275 | idx += exidx_vma + i * 8; | |
2276 | ||
2277 | /* Find section containing function and compute section offset. */ | |
2278 | sec = arm_obj_section_from_vma (objfile, idx); | |
2279 | if (sec == NULL) | |
2280 | continue; | |
2281 | idx -= bfd_get_section_vma (objfile->obfd, sec->the_bfd_section); | |
2282 | ||
2283 | /* Determine address of exception table entry. */ | |
2284 | if (val == 1) | |
2285 | { | |
2286 | /* EXIDX_CANTUNWIND -- no exception table entry present. */ | |
2287 | } | |
2288 | else if ((val & 0xff000000) == 0x80000000) | |
2289 | { | |
2290 | /* Exception table entry embedded in .ARM.exidx | |
2291 | -- must be short form. */ | |
2292 | word = val; | |
2293 | n_bytes = 3; | |
2294 | } | |
2295 | else if (!(val & 0x80000000)) | |
2296 | { | |
2297 | /* Exception table entry in .ARM.extab. */ | |
2298 | addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2299 | addr += exidx_vma + i * 8 + 4; | |
2300 | ||
2301 | if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size) | |
2302 | { | |
2303 | word = bfd_h_get_32 (objfile->obfd, | |
2304 | extab_data + addr - extab_vma); | |
2305 | addr += 4; | |
2306 | ||
2307 | if ((word & 0xff000000) == 0x80000000) | |
2308 | { | |
2309 | /* Short form. */ | |
2310 | n_bytes = 3; | |
2311 | } | |
2312 | else if ((word & 0xff000000) == 0x81000000 | |
2313 | || (word & 0xff000000) == 0x82000000) | |
2314 | { | |
2315 | /* Long form. */ | |
2316 | n_bytes = 2; | |
2317 | n_words = ((word >> 16) & 0xff); | |
2318 | } | |
2319 | else if (!(word & 0x80000000)) | |
2320 | { | |
2321 | bfd_vma pers; | |
2322 | struct obj_section *pers_sec; | |
2323 | int gnu_personality = 0; | |
2324 | ||
2325 | /* Custom personality routine. */ | |
2326 | pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000; | |
2327 | pers = UNMAKE_THUMB_ADDR (pers + addr - 4); | |
2328 | ||
2329 | /* Check whether we've got one of the variants of the | |
2330 | GNU personality routines. */ | |
2331 | pers_sec = arm_obj_section_from_vma (objfile, pers); | |
2332 | if (pers_sec) | |
2333 | { | |
2334 | static const char *personality[] = | |
2335 | { | |
2336 | "__gcc_personality_v0", | |
2337 | "__gxx_personality_v0", | |
2338 | "__gcj_personality_v0", | |
2339 | "__gnu_objc_personality_v0", | |
2340 | NULL | |
2341 | }; | |
2342 | ||
2343 | CORE_ADDR pc = pers + obj_section_offset (pers_sec); | |
2344 | int k; | |
2345 | ||
2346 | for (k = 0; personality[k]; k++) | |
2347 | if (lookup_minimal_symbol_by_pc_name | |
2348 | (pc, personality[k], objfile)) | |
2349 | { | |
2350 | gnu_personality = 1; | |
2351 | break; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | /* If so, the next word contains a word count in the high | |
2356 | byte, followed by the same unwind instructions as the | |
2357 | pre-defined forms. */ | |
2358 | if (gnu_personality | |
2359 | && addr + 4 <= extab_vma + extab_size) | |
2360 | { | |
2361 | word = bfd_h_get_32 (objfile->obfd, | |
2362 | extab_data + addr - extab_vma); | |
2363 | addr += 4; | |
2364 | n_bytes = 3; | |
2365 | n_words = ((word >> 24) & 0xff); | |
2366 | } | |
2367 | } | |
2368 | } | |
2369 | } | |
2370 | ||
2371 | /* Sanity check address. */ | |
2372 | if (n_words) | |
2373 | if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size) | |
2374 | n_words = n_bytes = 0; | |
2375 | ||
2376 | /* The unwind instructions reside in WORD (only the N_BYTES least | |
2377 | significant bytes are valid), followed by N_WORDS words in the | |
2378 | extab section starting at ADDR. */ | |
2379 | if (n_bytes || n_words) | |
2380 | { | |
2381 | gdb_byte *p = entry = obstack_alloc (&objfile->objfile_obstack, | |
2382 | n_bytes + n_words * 4 + 1); | |
2383 | ||
2384 | while (n_bytes--) | |
2385 | *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff); | |
2386 | ||
2387 | while (n_words--) | |
2388 | { | |
2389 | word = bfd_h_get_32 (objfile->obfd, | |
2390 | extab_data + addr - extab_vma); | |
2391 | addr += 4; | |
2392 | ||
2393 | *p++ = (gdb_byte) ((word >> 24) & 0xff); | |
2394 | *p++ = (gdb_byte) ((word >> 16) & 0xff); | |
2395 | *p++ = (gdb_byte) ((word >> 8) & 0xff); | |
2396 | *p++ = (gdb_byte) (word & 0xff); | |
2397 | } | |
2398 | ||
2399 | /* Implied "Finish" to terminate the list. */ | |
2400 | *p++ = 0xb0; | |
2401 | } | |
2402 | ||
2403 | /* Push entry onto vector. They are guaranteed to always | |
2404 | appear in order of increasing addresses. */ | |
2405 | new_exidx_entry.addr = idx; | |
2406 | new_exidx_entry.entry = entry; | |
2407 | VEC_safe_push (arm_exidx_entry_s, | |
2408 | data->section_maps[sec->the_bfd_section->index], | |
2409 | &new_exidx_entry); | |
2410 | } | |
2411 | ||
2412 | do_cleanups (cleanups); | |
2413 | } | |
2414 | ||
2415 | /* Search for the exception table entry covering MEMADDR. If one is found, | |
2416 | return a pointer to its data. Otherwise, return 0. If START is non-NULL, | |
2417 | set *START to the start of the region covered by this entry. */ | |
2418 | ||
2419 | static gdb_byte * | |
2420 | arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start) | |
2421 | { | |
2422 | struct obj_section *sec; | |
2423 | ||
2424 | sec = find_pc_section (memaddr); | |
2425 | if (sec != NULL) | |
2426 | { | |
2427 | struct arm_exidx_data *data; | |
2428 | VEC(arm_exidx_entry_s) *map; | |
2429 | struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 }; | |
2430 | unsigned int idx; | |
2431 | ||
2432 | data = objfile_data (sec->objfile, arm_exidx_data_key); | |
2433 | if (data != NULL) | |
2434 | { | |
2435 | map = data->section_maps[sec->the_bfd_section->index]; | |
2436 | if (!VEC_empty (arm_exidx_entry_s, map)) | |
2437 | { | |
2438 | struct arm_exidx_entry *map_sym; | |
2439 | ||
2440 | idx = VEC_lower_bound (arm_exidx_entry_s, map, &map_key, | |
2441 | arm_compare_exidx_entries); | |
2442 | ||
2443 | /* VEC_lower_bound finds the earliest ordered insertion | |
2444 | point. If the following symbol starts at this exact | |
2445 | address, we use that; otherwise, the preceding | |
2446 | exception table entry covers this address. */ | |
2447 | if (idx < VEC_length (arm_exidx_entry_s, map)) | |
2448 | { | |
2449 | map_sym = VEC_index (arm_exidx_entry_s, map, idx); | |
2450 | if (map_sym->addr == map_key.addr) | |
2451 | { | |
2452 | if (start) | |
2453 | *start = map_sym->addr + obj_section_addr (sec); | |
2454 | return map_sym->entry; | |
2455 | } | |
2456 | } | |
2457 | ||
2458 | if (idx > 0) | |
2459 | { | |
2460 | map_sym = VEC_index (arm_exidx_entry_s, map, idx - 1); | |
2461 | if (start) | |
2462 | *start = map_sym->addr + obj_section_addr (sec); | |
2463 | return map_sym->entry; | |
2464 | } | |
2465 | } | |
2466 | } | |
2467 | } | |
2468 | ||
2469 | return NULL; | |
2470 | } | |
2471 | ||
2472 | /* Given the current frame THIS_FRAME, and its associated frame unwinding | |
2473 | instruction list from the ARM exception table entry ENTRY, allocate and | |
2474 | return a prologue cache structure describing how to unwind this frame. | |
2475 | ||
2476 | Return NULL if the unwinding instruction list contains a "spare", | |
2477 | "reserved" or "refuse to unwind" instruction as defined in section | |
2478 | "9.3 Frame unwinding instructions" of the "Exception Handling ABI | |
2479 | for the ARM Architecture" document. */ | |
2480 | ||
2481 | static struct arm_prologue_cache * | |
2482 | arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry) | |
2483 | { | |
2484 | CORE_ADDR vsp = 0; | |
2485 | int vsp_valid = 0; | |
2486 | ||
2487 | struct arm_prologue_cache *cache; | |
2488 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); | |
2489 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); | |
2490 | ||
2491 | for (;;) | |
2492 | { | |
2493 | gdb_byte insn; | |
2494 | ||
2495 | /* Whenever we reload SP, we actually have to retrieve its | |
2496 | actual value in the current frame. */ | |
2497 | if (!vsp_valid) | |
2498 | { | |
2499 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2500 | { | |
2501 | int reg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2502 | vsp = get_frame_register_unsigned (this_frame, reg); | |
2503 | } | |
2504 | else | |
2505 | { | |
2506 | CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr; | |
2507 | vsp = get_frame_memory_unsigned (this_frame, addr, 4); | |
2508 | } | |
2509 | ||
2510 | vsp_valid = 1; | |
2511 | } | |
2512 | ||
2513 | /* Decode next unwind instruction. */ | |
2514 | insn = *entry++; | |
2515 | ||
2516 | if ((insn & 0xc0) == 0) | |
2517 | { | |
2518 | int offset = insn & 0x3f; | |
2519 | vsp += (offset << 2) + 4; | |
2520 | } | |
2521 | else if ((insn & 0xc0) == 0x40) | |
2522 | { | |
2523 | int offset = insn & 0x3f; | |
2524 | vsp -= (offset << 2) + 4; | |
2525 | } | |
2526 | else if ((insn & 0xf0) == 0x80) | |
2527 | { | |
2528 | int mask = ((insn & 0xf) << 8) | *entry++; | |
2529 | int i; | |
2530 | ||
2531 | /* The special case of an all-zero mask identifies | |
2532 | "Refuse to unwind". We return NULL to fall back | |
2533 | to the prologue analyzer. */ | |
2534 | if (mask == 0) | |
2535 | return NULL; | |
2536 | ||
2537 | /* Pop registers r4..r15 under mask. */ | |
2538 | for (i = 0; i < 12; i++) | |
2539 | if (mask & (1 << i)) | |
2540 | { | |
2541 | cache->saved_regs[4 + i].addr = vsp; | |
2542 | vsp += 4; | |
2543 | } | |
2544 | ||
2545 | /* Special-case popping SP -- we need to reload vsp. */ | |
2546 | if (mask & (1 << (ARM_SP_REGNUM - 4))) | |
2547 | vsp_valid = 0; | |
2548 | } | |
2549 | else if ((insn & 0xf0) == 0x90) | |
2550 | { | |
2551 | int reg = insn & 0xf; | |
2552 | ||
2553 | /* Reserved cases. */ | |
2554 | if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM) | |
2555 | return NULL; | |
2556 | ||
2557 | /* Set SP from another register and mark VSP for reload. */ | |
2558 | cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg]; | |
2559 | vsp_valid = 0; | |
2560 | } | |
2561 | else if ((insn & 0xf0) == 0xa0) | |
2562 | { | |
2563 | int count = insn & 0x7; | |
2564 | int pop_lr = (insn & 0x8) != 0; | |
2565 | int i; | |
2566 | ||
2567 | /* Pop r4..r[4+count]. */ | |
2568 | for (i = 0; i <= count; i++) | |
2569 | { | |
2570 | cache->saved_regs[4 + i].addr = vsp; | |
2571 | vsp += 4; | |
2572 | } | |
2573 | ||
2574 | /* If indicated by flag, pop LR as well. */ | |
2575 | if (pop_lr) | |
2576 | { | |
2577 | cache->saved_regs[ARM_LR_REGNUM].addr = vsp; | |
2578 | vsp += 4; | |
2579 | } | |
2580 | } | |
2581 | else if (insn == 0xb0) | |
2582 | { | |
2583 | /* We could only have updated PC by popping into it; if so, it | |
2584 | will show up as address. Otherwise, copy LR into PC. */ | |
2585 | if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM)) | |
2586 | cache->saved_regs[ARM_PC_REGNUM] | |
2587 | = cache->saved_regs[ARM_LR_REGNUM]; | |
2588 | ||
2589 | /* We're done. */ | |
2590 | break; | |
2591 | } | |
2592 | else if (insn == 0xb1) | |
2593 | { | |
2594 | int mask = *entry++; | |
2595 | int i; | |
2596 | ||
2597 | /* All-zero mask and mask >= 16 is "spare". */ | |
2598 | if (mask == 0 || mask >= 16) | |
2599 | return NULL; | |
2600 | ||
2601 | /* Pop r0..r3 under mask. */ | |
2602 | for (i = 0; i < 4; i++) | |
2603 | if (mask & (1 << i)) | |
2604 | { | |
2605 | cache->saved_regs[i].addr = vsp; | |
2606 | vsp += 4; | |
2607 | } | |
2608 | } | |
2609 | else if (insn == 0xb2) | |
2610 | { | |
2611 | ULONGEST offset = 0; | |
2612 | unsigned shift = 0; | |
2613 | ||
2614 | do | |
2615 | { | |
2616 | offset |= (*entry & 0x7f) << shift; | |
2617 | shift += 7; | |
2618 | } | |
2619 | while (*entry++ & 0x80); | |
2620 | ||
2621 | vsp += 0x204 + (offset << 2); | |
2622 | } | |
2623 | else if (insn == 0xb3) | |
2624 | { | |
2625 | int start = *entry >> 4; | |
2626 | int count = (*entry++) & 0xf; | |
2627 | int i; | |
2628 | ||
2629 | /* Only registers D0..D15 are valid here. */ | |
2630 | if (start + count >= 16) | |
2631 | return NULL; | |
2632 | ||
2633 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2634 | for (i = 0; i <= count; i++) | |
2635 | { | |
2636 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2637 | vsp += 8; | |
2638 | } | |
2639 | ||
2640 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2641 | vsp += 4; | |
2642 | } | |
2643 | else if ((insn & 0xf8) == 0xb8) | |
2644 | { | |
2645 | int count = insn & 0x7; | |
2646 | int i; | |
2647 | ||
2648 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2649 | for (i = 0; i <= count; i++) | |
2650 | { | |
2651 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2652 | vsp += 8; | |
2653 | } | |
2654 | ||
2655 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ | |
2656 | vsp += 4; | |
2657 | } | |
2658 | else if (insn == 0xc6) | |
2659 | { | |
2660 | int start = *entry >> 4; | |
2661 | int count = (*entry++) & 0xf; | |
2662 | int i; | |
2663 | ||
2664 | /* Only registers WR0..WR15 are valid. */ | |
2665 | if (start + count >= 16) | |
2666 | return NULL; | |
2667 | ||
2668 | /* Pop iwmmx registers WR[start]..WR[start+count]. */ | |
2669 | for (i = 0; i <= count; i++) | |
2670 | { | |
2671 | cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp; | |
2672 | vsp += 8; | |
2673 | } | |
2674 | } | |
2675 | else if (insn == 0xc7) | |
2676 | { | |
2677 | int mask = *entry++; | |
2678 | int i; | |
2679 | ||
2680 | /* All-zero mask and mask >= 16 is "spare". */ | |
2681 | if (mask == 0 || mask >= 16) | |
2682 | return NULL; | |
2683 | ||
2684 | /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */ | |
2685 | for (i = 0; i < 4; i++) | |
2686 | if (mask & (1 << i)) | |
2687 | { | |
2688 | cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp; | |
2689 | vsp += 4; | |
2690 | } | |
2691 | } | |
2692 | else if ((insn & 0xf8) == 0xc0) | |
2693 | { | |
2694 | int count = insn & 0x7; | |
2695 | int i; | |
2696 | ||
2697 | /* Pop iwmmx registers WR[10]..WR[10+count]. */ | |
2698 | for (i = 0; i <= count; i++) | |
2699 | { | |
2700 | cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp; | |
2701 | vsp += 8; | |
2702 | } | |
2703 | } | |
2704 | else if (insn == 0xc8) | |
2705 | { | |
2706 | int start = *entry >> 4; | |
2707 | int count = (*entry++) & 0xf; | |
2708 | int i; | |
2709 | ||
2710 | /* Only registers D0..D31 are valid. */ | |
2711 | if (start + count >= 16) | |
2712 | return NULL; | |
2713 | ||
2714 | /* Pop VFP double-precision registers | |
2715 | D[16+start]..D[16+start+count]. */ | |
2716 | for (i = 0; i <= count; i++) | |
2717 | { | |
2718 | cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp; | |
2719 | vsp += 8; | |
2720 | } | |
2721 | } | |
2722 | else if (insn == 0xc9) | |
2723 | { | |
2724 | int start = *entry >> 4; | |
2725 | int count = (*entry++) & 0xf; | |
2726 | int i; | |
2727 | ||
2728 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ | |
2729 | for (i = 0; i <= count; i++) | |
2730 | { | |
2731 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; | |
2732 | vsp += 8; | |
2733 | } | |
2734 | } | |
2735 | else if ((insn & 0xf8) == 0xd0) | |
2736 | { | |
2737 | int count = insn & 0x7; | |
2738 | int i; | |
2739 | ||
2740 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ | |
2741 | for (i = 0; i <= count; i++) | |
2742 | { | |
2743 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; | |
2744 | vsp += 8; | |
2745 | } | |
2746 | } | |
2747 | else | |
2748 | { | |
2749 | /* Everything else is "spare". */ | |
2750 | return NULL; | |
2751 | } | |
2752 | } | |
2753 | ||
2754 | /* If we restore SP from a register, assume this was the frame register. | |
2755 | Otherwise just fall back to SP as frame register. */ | |
2756 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) | |
2757 | cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg; | |
2758 | else | |
2759 | cache->framereg = ARM_SP_REGNUM; | |
2760 | ||
2761 | /* Determine offset to previous frame. */ | |
2762 | cache->framesize | |
2763 | = vsp - get_frame_register_unsigned (this_frame, cache->framereg); | |
2764 | ||
2765 | /* We already got the previous SP. */ | |
2766 | cache->prev_sp = vsp; | |
2767 | ||
2768 | return cache; | |
2769 | } | |
2770 | ||
2771 | /* Unwinding via ARM exception table entries. Note that the sniffer | |
2772 | already computes a filled-in prologue cache, which is then used | |
2773 | with the same arm_prologue_this_id and arm_prologue_prev_register | |
2774 | routines also used for prologue-parsing based unwinding. */ | |
2775 | ||
2776 | static int | |
2777 | arm_exidx_unwind_sniffer (const struct frame_unwind *self, | |
2778 | struct frame_info *this_frame, | |
2779 | void **this_prologue_cache) | |
2780 | { | |
2781 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2782 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
2783 | CORE_ADDR addr_in_block, exidx_region, func_start; | |
2784 | struct arm_prologue_cache *cache; | |
2785 | gdb_byte *entry; | |
2786 | ||
2787 | /* See if we have an ARM exception table entry covering this address. */ | |
2788 | addr_in_block = get_frame_address_in_block (this_frame); | |
2789 | entry = arm_find_exidx_entry (addr_in_block, &exidx_region); | |
2790 | if (!entry) | |
2791 | return 0; | |
2792 | ||
2793 | /* The ARM exception table does not describe unwind information | |
2794 | for arbitrary PC values, but is guaranteed to be correct only | |
2795 | at call sites. We have to decide here whether we want to use | |
2796 | ARM exception table information for this frame, or fall back | |
2797 | to using prologue parsing. (Note that if we have DWARF CFI, | |
2798 | this sniffer isn't even called -- CFI is always preferred.) | |
2799 | ||
2800 | Before we make this decision, however, we check whether we | |
2801 | actually have *symbol* information for the current frame. | |
2802 | If not, prologue parsing would not work anyway, so we might | |
2803 | as well use the exception table and hope for the best. */ | |
2804 | if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL)) | |
2805 | { | |
2806 | int exc_valid = 0; | |
2807 | ||
2808 | /* If the next frame is "normal", we are at a call site in this | |
2809 | frame, so exception information is guaranteed to be valid. */ | |
2810 | if (get_next_frame (this_frame) | |
2811 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) | |
2812 | exc_valid = 1; | |
2813 | ||
2814 | /* We also assume exception information is valid if we're currently | |
2815 | blocked in a system call. The system library is supposed to | |
2816 | ensure this, so that e.g. pthread cancellation works. */ | |
2817 | if (arm_frame_is_thumb (this_frame)) | |
2818 | { | |
2819 | LONGEST insn; | |
2820 | ||
2821 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 2, 2, | |
2822 | byte_order_for_code, &insn) | |
2823 | && (insn & 0xff00) == 0xdf00 /* svc */) | |
2824 | exc_valid = 1; | |
2825 | } | |
2826 | else | |
2827 | { | |
2828 | LONGEST insn; | |
2829 | ||
2830 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 4, 4, | |
2831 | byte_order_for_code, &insn) | |
2832 | && (insn & 0x0f000000) == 0x0f000000 /* svc */) | |
2833 | exc_valid = 1; | |
2834 | } | |
2835 | ||
2836 | /* Bail out if we don't know that exception information is valid. */ | |
2837 | if (!exc_valid) | |
2838 | return 0; | |
2839 | ||
2840 | /* The ARM exception index does not mark the *end* of the region | |
2841 | covered by the entry, and some functions will not have any entry. | |
2842 | To correctly recognize the end of the covered region, the linker | |
2843 | should have inserted dummy records with a CANTUNWIND marker. | |
2844 | ||
2845 | Unfortunately, current versions of GNU ld do not reliably do | |
2846 | this, and thus we may have found an incorrect entry above. | |
2847 | As a (temporary) sanity check, we only use the entry if it | |
2848 | lies *within* the bounds of the function. Note that this check | |
2849 | might reject perfectly valid entries that just happen to cover | |
2850 | multiple functions; therefore this check ought to be removed | |
2851 | once the linker is fixed. */ | |
2852 | if (func_start > exidx_region) | |
2853 | return 0; | |
2854 | } | |
2855 | ||
2856 | /* Decode the list of unwinding instructions into a prologue cache. | |
2857 | Note that this may fail due to e.g. a "refuse to unwind" code. */ | |
2858 | cache = arm_exidx_fill_cache (this_frame, entry); | |
2859 | if (!cache) | |
2860 | return 0; | |
2861 | ||
2862 | *this_prologue_cache = cache; | |
2863 | return 1; | |
2864 | } | |
2865 | ||
2866 | struct frame_unwind arm_exidx_unwind = { | |
2867 | NORMAL_FRAME, | |
8fbca658 | 2868 | default_frame_unwind_stop_reason, |
0e9e9abd UW |
2869 | arm_prologue_this_id, |
2870 | arm_prologue_prev_register, | |
2871 | NULL, | |
2872 | arm_exidx_unwind_sniffer | |
2873 | }; | |
2874 | ||
909cf6ea | 2875 | static struct arm_prologue_cache * |
a262aec2 | 2876 | arm_make_stub_cache (struct frame_info *this_frame) |
909cf6ea | 2877 | { |
909cf6ea | 2878 | struct arm_prologue_cache *cache; |
909cf6ea | 2879 | |
35d5d4ee | 2880 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
a262aec2 | 2881 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
909cf6ea | 2882 | |
a262aec2 | 2883 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); |
909cf6ea DJ |
2884 | |
2885 | return cache; | |
2886 | } | |
2887 | ||
2888 | /* Our frame ID for a stub frame is the current SP and LR. */ | |
2889 | ||
2890 | static void | |
a262aec2 | 2891 | arm_stub_this_id (struct frame_info *this_frame, |
909cf6ea DJ |
2892 | void **this_cache, |
2893 | struct frame_id *this_id) | |
2894 | { | |
2895 | struct arm_prologue_cache *cache; | |
2896 | ||
2897 | if (*this_cache == NULL) | |
a262aec2 | 2898 | *this_cache = arm_make_stub_cache (this_frame); |
909cf6ea DJ |
2899 | cache = *this_cache; |
2900 | ||
a262aec2 | 2901 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
909cf6ea DJ |
2902 | } |
2903 | ||
a262aec2 DJ |
2904 | static int |
2905 | arm_stub_unwind_sniffer (const struct frame_unwind *self, | |
2906 | struct frame_info *this_frame, | |
2907 | void **this_prologue_cache) | |
909cf6ea | 2908 | { |
93d42b30 | 2909 | CORE_ADDR addr_in_block; |
909cf6ea DJ |
2910 | char dummy[4]; |
2911 | ||
a262aec2 | 2912 | addr_in_block = get_frame_address_in_block (this_frame); |
93d42b30 | 2913 | if (in_plt_section (addr_in_block, NULL) |
fc36e839 DE |
2914 | /* We also use the stub winder if the target memory is unreadable |
2915 | to avoid having the prologue unwinder trying to read it. */ | |
a262aec2 DJ |
2916 | || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0) |
2917 | return 1; | |
909cf6ea | 2918 | |
a262aec2 | 2919 | return 0; |
909cf6ea DJ |
2920 | } |
2921 | ||
a262aec2 DJ |
2922 | struct frame_unwind arm_stub_unwind = { |
2923 | NORMAL_FRAME, | |
8fbca658 | 2924 | default_frame_unwind_stop_reason, |
a262aec2 DJ |
2925 | arm_stub_this_id, |
2926 | arm_prologue_prev_register, | |
2927 | NULL, | |
2928 | arm_stub_unwind_sniffer | |
2929 | }; | |
2930 | ||
24de872b | 2931 | static CORE_ADDR |
a262aec2 | 2932 | arm_normal_frame_base (struct frame_info *this_frame, void **this_cache) |
24de872b DJ |
2933 | { |
2934 | struct arm_prologue_cache *cache; | |
2935 | ||
eb5492fa | 2936 | if (*this_cache == NULL) |
a262aec2 | 2937 | *this_cache = arm_make_prologue_cache (this_frame); |
eb5492fa DJ |
2938 | cache = *this_cache; |
2939 | ||
4be43953 | 2940 | return cache->prev_sp - cache->framesize; |
24de872b DJ |
2941 | } |
2942 | ||
eb5492fa DJ |
2943 | struct frame_base arm_normal_base = { |
2944 | &arm_prologue_unwind, | |
2945 | arm_normal_frame_base, | |
2946 | arm_normal_frame_base, | |
2947 | arm_normal_frame_base | |
2948 | }; | |
2949 | ||
a262aec2 | 2950 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that |
eb5492fa DJ |
2951 | dummy frame. The frame ID's base needs to match the TOS value |
2952 | saved by save_dummy_frame_tos() and returned from | |
2953 | arm_push_dummy_call, and the PC needs to match the dummy frame's | |
2954 | breakpoint. */ | |
c906108c | 2955 | |
eb5492fa | 2956 | static struct frame_id |
a262aec2 | 2957 | arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
c906108c | 2958 | { |
0963b4bd MS |
2959 | return frame_id_build (get_frame_register_unsigned (this_frame, |
2960 | ARM_SP_REGNUM), | |
a262aec2 | 2961 | get_frame_pc (this_frame)); |
eb5492fa | 2962 | } |
c3b4394c | 2963 | |
eb5492fa DJ |
2964 | /* Given THIS_FRAME, find the previous frame's resume PC (which will |
2965 | be used to construct the previous frame's ID, after looking up the | |
2966 | containing function). */ | |
c3b4394c | 2967 | |
eb5492fa DJ |
2968 | static CORE_ADDR |
2969 | arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
2970 | { | |
2971 | CORE_ADDR pc; | |
2972 | pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM); | |
24568a2c | 2973 | return arm_addr_bits_remove (gdbarch, pc); |
eb5492fa DJ |
2974 | } |
2975 | ||
2976 | static CORE_ADDR | |
2977 | arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) | |
2978 | { | |
2979 | return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM); | |
c906108c SS |
2980 | } |
2981 | ||
b39cc962 DJ |
2982 | static struct value * |
2983 | arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, | |
2984 | int regnum) | |
2985 | { | |
24568a2c | 2986 | struct gdbarch * gdbarch = get_frame_arch (this_frame); |
b39cc962 | 2987 | CORE_ADDR lr, cpsr; |
9779414d | 2988 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
b39cc962 DJ |
2989 | |
2990 | switch (regnum) | |
2991 | { | |
2992 | case ARM_PC_REGNUM: | |
2993 | /* The PC is normally copied from the return column, which | |
2994 | describes saves of LR. However, that version may have an | |
2995 | extra bit set to indicate Thumb state. The bit is not | |
2996 | part of the PC. */ | |
2997 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); | |
2998 | return frame_unwind_got_constant (this_frame, regnum, | |
24568a2c | 2999 | arm_addr_bits_remove (gdbarch, lr)); |
b39cc962 DJ |
3000 | |
3001 | case ARM_PS_REGNUM: | |
3002 | /* Reconstruct the T bit; see arm_prologue_prev_register for details. */ | |
ca38c58e | 3003 | cpsr = get_frame_register_unsigned (this_frame, regnum); |
b39cc962 DJ |
3004 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
3005 | if (IS_THUMB_ADDR (lr)) | |
9779414d | 3006 | cpsr |= t_bit; |
b39cc962 | 3007 | else |
9779414d | 3008 | cpsr &= ~t_bit; |
ca38c58e | 3009 | return frame_unwind_got_constant (this_frame, regnum, cpsr); |
b39cc962 DJ |
3010 | |
3011 | default: | |
3012 | internal_error (__FILE__, __LINE__, | |
3013 | _("Unexpected register %d"), regnum); | |
3014 | } | |
3015 | } | |
3016 | ||
3017 | static void | |
3018 | arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, | |
3019 | struct dwarf2_frame_state_reg *reg, | |
3020 | struct frame_info *this_frame) | |
3021 | { | |
3022 | switch (regnum) | |
3023 | { | |
3024 | case ARM_PC_REGNUM: | |
3025 | case ARM_PS_REGNUM: | |
3026 | reg->how = DWARF2_FRAME_REG_FN; | |
3027 | reg->loc.fn = arm_dwarf2_prev_register; | |
3028 | break; | |
3029 | case ARM_SP_REGNUM: | |
3030 | reg->how = DWARF2_FRAME_REG_CFA; | |
3031 | break; | |
3032 | } | |
3033 | } | |
3034 | ||
4024ca99 UW |
3035 | /* Return true if we are in the function's epilogue, i.e. after the |
3036 | instruction that destroyed the function's stack frame. */ | |
3037 | ||
3038 | static int | |
3039 | thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3040 | { | |
3041 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3042 | unsigned int insn, insn2; | |
3043 | int found_return = 0, found_stack_adjust = 0; | |
3044 | CORE_ADDR func_start, func_end; | |
3045 | CORE_ADDR scan_pc; | |
3046 | gdb_byte buf[4]; | |
3047 | ||
3048 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3049 | return 0; | |
3050 | ||
3051 | /* The epilogue is a sequence of instructions along the following lines: | |
3052 | ||
3053 | - add stack frame size to SP or FP | |
3054 | - [if frame pointer used] restore SP from FP | |
3055 | - restore registers from SP [may include PC] | |
3056 | - a return-type instruction [if PC wasn't already restored] | |
3057 | ||
3058 | In a first pass, we scan forward from the current PC and verify the | |
3059 | instructions we find as compatible with this sequence, ending in a | |
3060 | return instruction. | |
3061 | ||
3062 | However, this is not sufficient to distinguish indirect function calls | |
3063 | within a function from indirect tail calls in the epilogue in some cases. | |
3064 | Therefore, if we didn't already find any SP-changing instruction during | |
3065 | forward scan, we add a backward scanning heuristic to ensure we actually | |
3066 | are in the epilogue. */ | |
3067 | ||
3068 | scan_pc = pc; | |
3069 | while (scan_pc < func_end && !found_return) | |
3070 | { | |
3071 | if (target_read_memory (scan_pc, buf, 2)) | |
3072 | break; | |
3073 | ||
3074 | scan_pc += 2; | |
3075 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3076 | ||
3077 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ | |
3078 | found_return = 1; | |
3079 | else if (insn == 0x46f7) /* mov pc, lr */ | |
3080 | found_return = 1; | |
3081 | else if (insn == 0x46bd) /* mov sp, r7 */ | |
3082 | found_stack_adjust = 1; | |
3083 | else if ((insn & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ | |
3084 | found_stack_adjust = 1; | |
3085 | else if ((insn & 0xfe00) == 0xbc00) /* pop <registers> */ | |
3086 | { | |
3087 | found_stack_adjust = 1; | |
3088 | if (insn & 0x0100) /* <registers> include PC. */ | |
3089 | found_return = 1; | |
3090 | } | |
3091 | else if ((insn & 0xe000) == 0xe000) /* 32-bit Thumb-2 instruction */ | |
3092 | { | |
3093 | if (target_read_memory (scan_pc, buf, 2)) | |
3094 | break; | |
3095 | ||
3096 | scan_pc += 2; | |
3097 | insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3098 | ||
3099 | if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3100 | { | |
3101 | found_stack_adjust = 1; | |
3102 | if (insn2 & 0x8000) /* <registers> include PC. */ | |
3103 | found_return = 1; | |
3104 | } | |
3105 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3106 | && (insn2 & 0x0fff) == 0x0b04) | |
3107 | { | |
3108 | found_stack_adjust = 1; | |
3109 | if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */ | |
3110 | found_return = 1; | |
3111 | } | |
3112 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3113 | && (insn2 & 0x0e00) == 0x0a00) | |
3114 | found_stack_adjust = 1; | |
3115 | else | |
3116 | break; | |
3117 | } | |
3118 | else | |
3119 | break; | |
3120 | } | |
3121 | ||
3122 | if (!found_return) | |
3123 | return 0; | |
3124 | ||
3125 | /* Since any instruction in the epilogue sequence, with the possible | |
3126 | exception of return itself, updates the stack pointer, we need to | |
3127 | scan backwards for at most one instruction. Try either a 16-bit or | |
3128 | a 32-bit instruction. This is just a heuristic, so we do not worry | |
0963b4bd | 3129 | too much about false positives. */ |
4024ca99 UW |
3130 | |
3131 | if (!found_stack_adjust) | |
3132 | { | |
3133 | if (pc - 4 < func_start) | |
3134 | return 0; | |
3135 | if (target_read_memory (pc - 4, buf, 4)) | |
3136 | return 0; | |
3137 | ||
3138 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
3139 | insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code); | |
3140 | ||
3141 | if (insn2 == 0x46bd) /* mov sp, r7 */ | |
3142 | found_stack_adjust = 1; | |
3143 | else if ((insn2 & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ | |
3144 | found_stack_adjust = 1; | |
3145 | else if ((insn2 & 0xff00) == 0xbc00) /* pop <registers> without PC */ | |
3146 | found_stack_adjust = 1; | |
3147 | else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ | |
3148 | found_stack_adjust = 1; | |
3149 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ | |
3150 | && (insn2 & 0x0fff) == 0x0b04) | |
3151 | found_stack_adjust = 1; | |
3152 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ | |
3153 | && (insn2 & 0x0e00) == 0x0a00) | |
3154 | found_stack_adjust = 1; | |
3155 | } | |
3156 | ||
3157 | return found_stack_adjust; | |
3158 | } | |
3159 | ||
3160 | /* Return true if we are in the function's epilogue, i.e. after the | |
3161 | instruction that destroyed the function's stack frame. */ | |
3162 | ||
3163 | static int | |
3164 | arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) | |
3165 | { | |
3166 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
3167 | unsigned int insn; | |
3168 | int found_return, found_stack_adjust; | |
3169 | CORE_ADDR func_start, func_end; | |
3170 | ||
3171 | if (arm_pc_is_thumb (gdbarch, pc)) | |
3172 | return thumb_in_function_epilogue_p (gdbarch, pc); | |
3173 | ||
3174 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) | |
3175 | return 0; | |
3176 | ||
3177 | /* We are in the epilogue if the previous instruction was a stack | |
3178 | adjustment and the next instruction is a possible return (bx, mov | |
3179 | pc, or pop). We could have to scan backwards to find the stack | |
3180 | adjustment, or forwards to find the return, but this is a decent | |
3181 | approximation. First scan forwards. */ | |
3182 | ||
3183 | found_return = 0; | |
3184 | insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code); | |
3185 | if (bits (insn, 28, 31) != INST_NV) | |
3186 | { | |
3187 | if ((insn & 0x0ffffff0) == 0x012fff10) | |
3188 | /* BX. */ | |
3189 | found_return = 1; | |
3190 | else if ((insn & 0x0ffffff0) == 0x01a0f000) | |
3191 | /* MOV PC. */ | |
3192 | found_return = 1; | |
3193 | else if ((insn & 0x0fff0000) == 0x08bd0000 | |
3194 | && (insn & 0x0000c000) != 0) | |
3195 | /* POP (LDMIA), including PC or LR. */ | |
3196 | found_return = 1; | |
3197 | } | |
3198 | ||
3199 | if (!found_return) | |
3200 | return 0; | |
3201 | ||
3202 | /* Scan backwards. This is just a heuristic, so do not worry about | |
3203 | false positives from mode changes. */ | |
3204 | ||
3205 | if (pc < func_start + 4) | |
3206 | return 0; | |
3207 | ||
73c964d6 | 3208 | found_stack_adjust = 0; |
4024ca99 UW |
3209 | insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); |
3210 | if (bits (insn, 28, 31) != INST_NV) | |
3211 | { | |
3212 | if ((insn & 0x0df0f000) == 0x0080d000) | |
3213 | /* ADD SP (register or immediate). */ | |
3214 | found_stack_adjust = 1; | |
3215 | else if ((insn & 0x0df0f000) == 0x0040d000) | |
3216 | /* SUB SP (register or immediate). */ | |
3217 | found_stack_adjust = 1; | |
3218 | else if ((insn & 0x0ffffff0) == 0x01a0d000) | |
3219 | /* MOV SP. */ | |
77bc0675 | 3220 | found_stack_adjust = 1; |
4024ca99 UW |
3221 | else if ((insn & 0x0fff0000) == 0x08bd0000) |
3222 | /* POP (LDMIA). */ | |
3223 | found_stack_adjust = 1; | |
3224 | } | |
3225 | ||
3226 | if (found_stack_adjust) | |
3227 | return 1; | |
3228 | ||
3229 | return 0; | |
3230 | } | |
3231 | ||
3232 | ||
2dd604e7 RE |
3233 | /* When arguments must be pushed onto the stack, they go on in reverse |
3234 | order. The code below implements a FILO (stack) to do this. */ | |
3235 | ||
3236 | struct stack_item | |
3237 | { | |
3238 | int len; | |
3239 | struct stack_item *prev; | |
3240 | void *data; | |
3241 | }; | |
3242 | ||
3243 | static struct stack_item * | |
8c6363cf | 3244 | push_stack_item (struct stack_item *prev, const void *contents, int len) |
2dd604e7 RE |
3245 | { |
3246 | struct stack_item *si; | |
3247 | si = xmalloc (sizeof (struct stack_item)); | |
226c7fbc | 3248 | si->data = xmalloc (len); |
2dd604e7 RE |
3249 | si->len = len; |
3250 | si->prev = prev; | |
3251 | memcpy (si->data, contents, len); | |
3252 | return si; | |
3253 | } | |
3254 | ||
3255 | static struct stack_item * | |
3256 | pop_stack_item (struct stack_item *si) | |
3257 | { | |
3258 | struct stack_item *dead = si; | |
3259 | si = si->prev; | |
3260 | xfree (dead->data); | |
3261 | xfree (dead); | |
3262 | return si; | |
3263 | } | |
3264 | ||
2af48f68 PB |
3265 | |
3266 | /* Return the alignment (in bytes) of the given type. */ | |
3267 | ||
3268 | static int | |
3269 | arm_type_align (struct type *t) | |
3270 | { | |
3271 | int n; | |
3272 | int align; | |
3273 | int falign; | |
3274 | ||
3275 | t = check_typedef (t); | |
3276 | switch (TYPE_CODE (t)) | |
3277 | { | |
3278 | default: | |
3279 | /* Should never happen. */ | |
3280 | internal_error (__FILE__, __LINE__, _("unknown type alignment")); | |
3281 | return 4; | |
3282 | ||
3283 | case TYPE_CODE_PTR: | |
3284 | case TYPE_CODE_ENUM: | |
3285 | case TYPE_CODE_INT: | |
3286 | case TYPE_CODE_FLT: | |
3287 | case TYPE_CODE_SET: | |
3288 | case TYPE_CODE_RANGE: | |
3289 | case TYPE_CODE_BITSTRING: | |
3290 | case TYPE_CODE_REF: | |
3291 | case TYPE_CODE_CHAR: | |
3292 | case TYPE_CODE_BOOL: | |
3293 | return TYPE_LENGTH (t); | |
3294 | ||
3295 | case TYPE_CODE_ARRAY: | |
3296 | case TYPE_CODE_COMPLEX: | |
3297 | /* TODO: What about vector types? */ | |
3298 | return arm_type_align (TYPE_TARGET_TYPE (t)); | |
3299 | ||
3300 | case TYPE_CODE_STRUCT: | |
3301 | case TYPE_CODE_UNION: | |
3302 | align = 1; | |
3303 | for (n = 0; n < TYPE_NFIELDS (t); n++) | |
3304 | { | |
3305 | falign = arm_type_align (TYPE_FIELD_TYPE (t, n)); | |
3306 | if (falign > align) | |
3307 | align = falign; | |
3308 | } | |
3309 | return align; | |
3310 | } | |
3311 | } | |
3312 | ||
90445bd3 DJ |
3313 | /* Possible base types for a candidate for passing and returning in |
3314 | VFP registers. */ | |
3315 | ||
3316 | enum arm_vfp_cprc_base_type | |
3317 | { | |
3318 | VFP_CPRC_UNKNOWN, | |
3319 | VFP_CPRC_SINGLE, | |
3320 | VFP_CPRC_DOUBLE, | |
3321 | VFP_CPRC_VEC64, | |
3322 | VFP_CPRC_VEC128 | |
3323 | }; | |
3324 | ||
3325 | /* The length of one element of base type B. */ | |
3326 | ||
3327 | static unsigned | |
3328 | arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b) | |
3329 | { | |
3330 | switch (b) | |
3331 | { | |
3332 | case VFP_CPRC_SINGLE: | |
3333 | return 4; | |
3334 | case VFP_CPRC_DOUBLE: | |
3335 | return 8; | |
3336 | case VFP_CPRC_VEC64: | |
3337 | return 8; | |
3338 | case VFP_CPRC_VEC128: | |
3339 | return 16; | |
3340 | default: | |
3341 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3342 | (int) b); | |
3343 | } | |
3344 | } | |
3345 | ||
3346 | /* The character ('s', 'd' or 'q') for the type of VFP register used | |
3347 | for passing base type B. */ | |
3348 | ||
3349 | static int | |
3350 | arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b) | |
3351 | { | |
3352 | switch (b) | |
3353 | { | |
3354 | case VFP_CPRC_SINGLE: | |
3355 | return 's'; | |
3356 | case VFP_CPRC_DOUBLE: | |
3357 | return 'd'; | |
3358 | case VFP_CPRC_VEC64: | |
3359 | return 'd'; | |
3360 | case VFP_CPRC_VEC128: | |
3361 | return 'q'; | |
3362 | default: | |
3363 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), | |
3364 | (int) b); | |
3365 | } | |
3366 | } | |
3367 | ||
3368 | /* Determine whether T may be part of a candidate for passing and | |
3369 | returning in VFP registers, ignoring the limit on the total number | |
3370 | of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the | |
3371 | classification of the first valid component found; if it is not | |
3372 | VFP_CPRC_UNKNOWN, all components must have the same classification | |
3373 | as *BASE_TYPE. If it is found that T contains a type not permitted | |
3374 | for passing and returning in VFP registers, a type differently | |
3375 | classified from *BASE_TYPE, or two types differently classified | |
3376 | from each other, return -1, otherwise return the total number of | |
3377 | base-type elements found (possibly 0 in an empty structure or | |
3378 | array). Vectors and complex types are not currently supported, | |
3379 | matching the generic AAPCS support. */ | |
3380 | ||
3381 | static int | |
3382 | arm_vfp_cprc_sub_candidate (struct type *t, | |
3383 | enum arm_vfp_cprc_base_type *base_type) | |
3384 | { | |
3385 | t = check_typedef (t); | |
3386 | switch (TYPE_CODE (t)) | |
3387 | { | |
3388 | case TYPE_CODE_FLT: | |
3389 | switch (TYPE_LENGTH (t)) | |
3390 | { | |
3391 | case 4: | |
3392 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3393 | *base_type = VFP_CPRC_SINGLE; | |
3394 | else if (*base_type != VFP_CPRC_SINGLE) | |
3395 | return -1; | |
3396 | return 1; | |
3397 | ||
3398 | case 8: | |
3399 | if (*base_type == VFP_CPRC_UNKNOWN) | |
3400 | *base_type = VFP_CPRC_DOUBLE; | |
3401 | else if (*base_type != VFP_CPRC_DOUBLE) | |
3402 | return -1; | |
3403 | return 1; | |
3404 | ||
3405 | default: | |
3406 | return -1; | |
3407 | } | |
3408 | break; | |
3409 | ||
3410 | case TYPE_CODE_ARRAY: | |
3411 | { | |
3412 | int count; | |
3413 | unsigned unitlen; | |
3414 | count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type); | |
3415 | if (count == -1) | |
3416 | return -1; | |
3417 | if (TYPE_LENGTH (t) == 0) | |
3418 | { | |
3419 | gdb_assert (count == 0); | |
3420 | return 0; | |
3421 | } | |
3422 | else if (count == 0) | |
3423 | return -1; | |
3424 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3425 | gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0); | |
3426 | return TYPE_LENGTH (t) / unitlen; | |
3427 | } | |
3428 | break; | |
3429 | ||
3430 | case TYPE_CODE_STRUCT: | |
3431 | { | |
3432 | int count = 0; | |
3433 | unsigned unitlen; | |
3434 | int i; | |
3435 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3436 | { | |
3437 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3438 | base_type); | |
3439 | if (sub_count == -1) | |
3440 | return -1; | |
3441 | count += sub_count; | |
3442 | } | |
3443 | if (TYPE_LENGTH (t) == 0) | |
3444 | { | |
3445 | gdb_assert (count == 0); | |
3446 | return 0; | |
3447 | } | |
3448 | else if (count == 0) | |
3449 | return -1; | |
3450 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3451 | if (TYPE_LENGTH (t) != unitlen * count) | |
3452 | return -1; | |
3453 | return count; | |
3454 | } | |
3455 | ||
3456 | case TYPE_CODE_UNION: | |
3457 | { | |
3458 | int count = 0; | |
3459 | unsigned unitlen; | |
3460 | int i; | |
3461 | for (i = 0; i < TYPE_NFIELDS (t); i++) | |
3462 | { | |
3463 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), | |
3464 | base_type); | |
3465 | if (sub_count == -1) | |
3466 | return -1; | |
3467 | count = (count > sub_count ? count : sub_count); | |
3468 | } | |
3469 | if (TYPE_LENGTH (t) == 0) | |
3470 | { | |
3471 | gdb_assert (count == 0); | |
3472 | return 0; | |
3473 | } | |
3474 | else if (count == 0) | |
3475 | return -1; | |
3476 | unitlen = arm_vfp_cprc_unit_length (*base_type); | |
3477 | if (TYPE_LENGTH (t) != unitlen * count) | |
3478 | return -1; | |
3479 | return count; | |
3480 | } | |
3481 | ||
3482 | default: | |
3483 | break; | |
3484 | } | |
3485 | ||
3486 | return -1; | |
3487 | } | |
3488 | ||
3489 | /* Determine whether T is a VFP co-processor register candidate (CPRC) | |
3490 | if passed to or returned from a non-variadic function with the VFP | |
3491 | ABI in effect. Return 1 if it is, 0 otherwise. If it is, set | |
3492 | *BASE_TYPE to the base type for T and *COUNT to the number of | |
3493 | elements of that base type before returning. */ | |
3494 | ||
3495 | static int | |
3496 | arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type, | |
3497 | int *count) | |
3498 | { | |
3499 | enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN; | |
3500 | int c = arm_vfp_cprc_sub_candidate (t, &b); | |
3501 | if (c <= 0 || c > 4) | |
3502 | return 0; | |
3503 | *base_type = b; | |
3504 | *count = c; | |
3505 | return 1; | |
3506 | } | |
3507 | ||
3508 | /* Return 1 if the VFP ABI should be used for passing arguments to and | |
3509 | returning values from a function of type FUNC_TYPE, 0 | |
3510 | otherwise. */ | |
3511 | ||
3512 | static int | |
3513 | arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type) | |
3514 | { | |
3515 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3516 | /* Variadic functions always use the base ABI. Assume that functions | |
3517 | without debug info are not variadic. */ | |
3518 | if (func_type && TYPE_VARARGS (check_typedef (func_type))) | |
3519 | return 0; | |
3520 | /* The VFP ABI is only supported as a variant of AAPCS. */ | |
3521 | if (tdep->arm_abi != ARM_ABI_AAPCS) | |
3522 | return 0; | |
3523 | return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP; | |
3524 | } | |
3525 | ||
3526 | /* We currently only support passing parameters in integer registers, which | |
3527 | conforms with GCC's default model, and VFP argument passing following | |
3528 | the VFP variant of AAPCS. Several other variants exist and | |
2dd604e7 RE |
3529 | we should probably support some of them based on the selected ABI. */ |
3530 | ||
3531 | static CORE_ADDR | |
7d9b040b | 3532 | arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
6a65450a AC |
3533 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
3534 | struct value **args, CORE_ADDR sp, int struct_return, | |
3535 | CORE_ADDR struct_addr) | |
2dd604e7 | 3536 | { |
e17a4113 | 3537 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
2dd604e7 RE |
3538 | int argnum; |
3539 | int argreg; | |
3540 | int nstack; | |
3541 | struct stack_item *si = NULL; | |
90445bd3 DJ |
3542 | int use_vfp_abi; |
3543 | struct type *ftype; | |
3544 | unsigned vfp_regs_free = (1 << 16) - 1; | |
3545 | ||
3546 | /* Determine the type of this function and whether the VFP ABI | |
3547 | applies. */ | |
3548 | ftype = check_typedef (value_type (function)); | |
3549 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) | |
3550 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
3551 | use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype); | |
2dd604e7 | 3552 | |
6a65450a AC |
3553 | /* Set the return address. For the ARM, the return breakpoint is |
3554 | always at BP_ADDR. */ | |
9779414d | 3555 | if (arm_pc_is_thumb (gdbarch, bp_addr)) |
9dca5578 | 3556 | bp_addr |= 1; |
6a65450a | 3557 | regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr); |
2dd604e7 RE |
3558 | |
3559 | /* Walk through the list of args and determine how large a temporary | |
3560 | stack is required. Need to take care here as structs may be | |
3561 | passed on the stack, and we have to to push them. */ | |
3562 | nstack = 0; | |
3563 | ||
3564 | argreg = ARM_A1_REGNUM; | |
3565 | nstack = 0; | |
3566 | ||
2dd604e7 RE |
3567 | /* The struct_return pointer occupies the first parameter |
3568 | passing register. */ | |
3569 | if (struct_return) | |
3570 | { | |
3571 | if (arm_debug) | |
5af949e3 | 3572 | fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n", |
2af46ca0 | 3573 | gdbarch_register_name (gdbarch, argreg), |
5af949e3 | 3574 | paddress (gdbarch, struct_addr)); |
2dd604e7 RE |
3575 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
3576 | argreg++; | |
3577 | } | |
3578 | ||
3579 | for (argnum = 0; argnum < nargs; argnum++) | |
3580 | { | |
3581 | int len; | |
3582 | struct type *arg_type; | |
3583 | struct type *target_type; | |
3584 | enum type_code typecode; | |
8c6363cf | 3585 | const bfd_byte *val; |
2af48f68 | 3586 | int align; |
90445bd3 DJ |
3587 | enum arm_vfp_cprc_base_type vfp_base_type; |
3588 | int vfp_base_count; | |
3589 | int may_use_core_reg = 1; | |
2dd604e7 | 3590 | |
df407dfe | 3591 | arg_type = check_typedef (value_type (args[argnum])); |
2dd604e7 RE |
3592 | len = TYPE_LENGTH (arg_type); |
3593 | target_type = TYPE_TARGET_TYPE (arg_type); | |
3594 | typecode = TYPE_CODE (arg_type); | |
8c6363cf | 3595 | val = value_contents (args[argnum]); |
2dd604e7 | 3596 | |
2af48f68 PB |
3597 | align = arm_type_align (arg_type); |
3598 | /* Round alignment up to a whole number of words. */ | |
3599 | align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1); | |
3600 | /* Different ABIs have different maximum alignments. */ | |
3601 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS) | |
3602 | { | |
3603 | /* The APCS ABI only requires word alignment. */ | |
3604 | align = INT_REGISTER_SIZE; | |
3605 | } | |
3606 | else | |
3607 | { | |
3608 | /* The AAPCS requires at most doubleword alignment. */ | |
3609 | if (align > INT_REGISTER_SIZE * 2) | |
3610 | align = INT_REGISTER_SIZE * 2; | |
3611 | } | |
3612 | ||
90445bd3 DJ |
3613 | if (use_vfp_abi |
3614 | && arm_vfp_call_candidate (arg_type, &vfp_base_type, | |
3615 | &vfp_base_count)) | |
3616 | { | |
3617 | int regno; | |
3618 | int unit_length; | |
3619 | int shift; | |
3620 | unsigned mask; | |
3621 | ||
3622 | /* Because this is a CPRC it cannot go in a core register or | |
3623 | cause a core register to be skipped for alignment. | |
3624 | Either it goes in VFP registers and the rest of this loop | |
3625 | iteration is skipped for this argument, or it goes on the | |
3626 | stack (and the stack alignment code is correct for this | |
3627 | case). */ | |
3628 | may_use_core_reg = 0; | |
3629 | ||
3630 | unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
3631 | shift = unit_length / 4; | |
3632 | mask = (1 << (shift * vfp_base_count)) - 1; | |
3633 | for (regno = 0; regno < 16; regno += shift) | |
3634 | if (((vfp_regs_free >> regno) & mask) == mask) | |
3635 | break; | |
3636 | ||
3637 | if (regno < 16) | |
3638 | { | |
3639 | int reg_char; | |
3640 | int reg_scaled; | |
3641 | int i; | |
3642 | ||
3643 | vfp_regs_free &= ~(mask << regno); | |
3644 | reg_scaled = regno / shift; | |
3645 | reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
3646 | for (i = 0; i < vfp_base_count; i++) | |
3647 | { | |
3648 | char name_buf[4]; | |
3649 | int regnum; | |
58d6951d DJ |
3650 | if (reg_char == 'q') |
3651 | arm_neon_quad_write (gdbarch, regcache, reg_scaled + i, | |
90445bd3 | 3652 | val + i * unit_length); |
58d6951d DJ |
3653 | else |
3654 | { | |
3655 | sprintf (name_buf, "%c%d", reg_char, reg_scaled + i); | |
3656 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, | |
3657 | strlen (name_buf)); | |
3658 | regcache_cooked_write (regcache, regnum, | |
3659 | val + i * unit_length); | |
3660 | } | |
90445bd3 DJ |
3661 | } |
3662 | continue; | |
3663 | } | |
3664 | else | |
3665 | { | |
3666 | /* This CPRC could not go in VFP registers, so all VFP | |
3667 | registers are now marked as used. */ | |
3668 | vfp_regs_free = 0; | |
3669 | } | |
3670 | } | |
3671 | ||
2af48f68 PB |
3672 | /* Push stack padding for dowubleword alignment. */ |
3673 | if (nstack & (align - 1)) | |
3674 | { | |
3675 | si = push_stack_item (si, val, INT_REGISTER_SIZE); | |
3676 | nstack += INT_REGISTER_SIZE; | |
3677 | } | |
3678 | ||
3679 | /* Doubleword aligned quantities must go in even register pairs. */ | |
90445bd3 DJ |
3680 | if (may_use_core_reg |
3681 | && argreg <= ARM_LAST_ARG_REGNUM | |
2af48f68 PB |
3682 | && align > INT_REGISTER_SIZE |
3683 | && argreg & 1) | |
3684 | argreg++; | |
3685 | ||
2dd604e7 RE |
3686 | /* If the argument is a pointer to a function, and it is a |
3687 | Thumb function, create a LOCAL copy of the value and set | |
3688 | the THUMB bit in it. */ | |
3689 | if (TYPE_CODE_PTR == typecode | |
3690 | && target_type != NULL | |
f96b8fa0 | 3691 | && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type))) |
2dd604e7 | 3692 | { |
e17a4113 | 3693 | CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order); |
9779414d | 3694 | if (arm_pc_is_thumb (gdbarch, regval)) |
2dd604e7 | 3695 | { |
8c6363cf TT |
3696 | bfd_byte *copy = alloca (len); |
3697 | store_unsigned_integer (copy, len, byte_order, | |
e17a4113 | 3698 | MAKE_THUMB_ADDR (regval)); |
8c6363cf | 3699 | val = copy; |
2dd604e7 RE |
3700 | } |
3701 | } | |
3702 | ||
3703 | /* Copy the argument to general registers or the stack in | |
3704 | register-sized pieces. Large arguments are split between | |
3705 | registers and stack. */ | |
3706 | while (len > 0) | |
3707 | { | |
f0c9063c | 3708 | int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE; |
2dd604e7 | 3709 | |
90445bd3 | 3710 | if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM) |
2dd604e7 RE |
3711 | { |
3712 | /* The argument is being passed in a general purpose | |
3713 | register. */ | |
e17a4113 UW |
3714 | CORE_ADDR regval |
3715 | = extract_unsigned_integer (val, partial_len, byte_order); | |
3716 | if (byte_order == BFD_ENDIAN_BIG) | |
8bf8793c | 3717 | regval <<= (INT_REGISTER_SIZE - partial_len) * 8; |
2dd604e7 RE |
3718 | if (arm_debug) |
3719 | fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", | |
c9f4d572 UW |
3720 | argnum, |
3721 | gdbarch_register_name | |
2af46ca0 | 3722 | (gdbarch, argreg), |
f0c9063c | 3723 | phex (regval, INT_REGISTER_SIZE)); |
2dd604e7 RE |
3724 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
3725 | argreg++; | |
3726 | } | |
3727 | else | |
3728 | { | |
3729 | /* Push the arguments onto the stack. */ | |
3730 | if (arm_debug) | |
3731 | fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n", | |
3732 | argnum, nstack); | |
f0c9063c UW |
3733 | si = push_stack_item (si, val, INT_REGISTER_SIZE); |
3734 | nstack += INT_REGISTER_SIZE; | |
2dd604e7 RE |
3735 | } |
3736 | ||
3737 | len -= partial_len; | |
3738 | val += partial_len; | |
3739 | } | |
3740 | } | |
3741 | /* If we have an odd number of words to push, then decrement the stack | |
3742 | by one word now, so first stack argument will be dword aligned. */ | |
3743 | if (nstack & 4) | |
3744 | sp -= 4; | |
3745 | ||
3746 | while (si) | |
3747 | { | |
3748 | sp -= si->len; | |
3749 | write_memory (sp, si->data, si->len); | |
3750 | si = pop_stack_item (si); | |
3751 | } | |
3752 | ||
3753 | /* Finally, update teh SP register. */ | |
3754 | regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp); | |
3755 | ||
3756 | return sp; | |
3757 | } | |
3758 | ||
f53f0d0b PB |
3759 | |
3760 | /* Always align the frame to an 8-byte boundary. This is required on | |
3761 | some platforms and harmless on the rest. */ | |
3762 | ||
3763 | static CORE_ADDR | |
3764 | arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
3765 | { | |
3766 | /* Align the stack to eight bytes. */ | |
3767 | return sp & ~ (CORE_ADDR) 7; | |
3768 | } | |
3769 | ||
c906108c | 3770 | static void |
ed9a39eb | 3771 | print_fpu_flags (int flags) |
c906108c | 3772 | { |
c5aa993b JM |
3773 | if (flags & (1 << 0)) |
3774 | fputs ("IVO ", stdout); | |
3775 | if (flags & (1 << 1)) | |
3776 | fputs ("DVZ ", stdout); | |
3777 | if (flags & (1 << 2)) | |
3778 | fputs ("OFL ", stdout); | |
3779 | if (flags & (1 << 3)) | |
3780 | fputs ("UFL ", stdout); | |
3781 | if (flags & (1 << 4)) | |
3782 | fputs ("INX ", stdout); | |
3783 | putchar ('\n'); | |
c906108c SS |
3784 | } |
3785 | ||
5e74b15c RE |
3786 | /* Print interesting information about the floating point processor |
3787 | (if present) or emulator. */ | |
34e8f22d | 3788 | static void |
d855c300 | 3789 | arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
23e3a7ac | 3790 | struct frame_info *frame, const char *args) |
c906108c | 3791 | { |
9c9acae0 | 3792 | unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM); |
c5aa993b JM |
3793 | int type; |
3794 | ||
3795 | type = (status >> 24) & 127; | |
edefbb7c AC |
3796 | if (status & (1 << 31)) |
3797 | printf (_("Hardware FPU type %d\n"), type); | |
3798 | else | |
3799 | printf (_("Software FPU type %d\n"), type); | |
3800 | /* i18n: [floating point unit] mask */ | |
3801 | fputs (_("mask: "), stdout); | |
c5aa993b | 3802 | print_fpu_flags (status >> 16); |
edefbb7c AC |
3803 | /* i18n: [floating point unit] flags */ |
3804 | fputs (_("flags: "), stdout); | |
c5aa993b | 3805 | print_fpu_flags (status); |
c906108c SS |
3806 | } |
3807 | ||
27067745 UW |
3808 | /* Construct the ARM extended floating point type. */ |
3809 | static struct type * | |
3810 | arm_ext_type (struct gdbarch *gdbarch) | |
3811 | { | |
3812 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3813 | ||
3814 | if (!tdep->arm_ext_type) | |
3815 | tdep->arm_ext_type | |
e9bb382b | 3816 | = arch_float_type (gdbarch, -1, "builtin_type_arm_ext", |
27067745 UW |
3817 | floatformats_arm_ext); |
3818 | ||
3819 | return tdep->arm_ext_type; | |
3820 | } | |
3821 | ||
58d6951d DJ |
3822 | static struct type * |
3823 | arm_neon_double_type (struct gdbarch *gdbarch) | |
3824 | { | |
3825 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3826 | ||
3827 | if (tdep->neon_double_type == NULL) | |
3828 | { | |
3829 | struct type *t, *elem; | |
3830 | ||
3831 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d", | |
3832 | TYPE_CODE_UNION); | |
3833 | elem = builtin_type (gdbarch)->builtin_uint8; | |
3834 | append_composite_type_field (t, "u8", init_vector_type (elem, 8)); | |
3835 | elem = builtin_type (gdbarch)->builtin_uint16; | |
3836 | append_composite_type_field (t, "u16", init_vector_type (elem, 4)); | |
3837 | elem = builtin_type (gdbarch)->builtin_uint32; | |
3838 | append_composite_type_field (t, "u32", init_vector_type (elem, 2)); | |
3839 | elem = builtin_type (gdbarch)->builtin_uint64; | |
3840 | append_composite_type_field (t, "u64", elem); | |
3841 | elem = builtin_type (gdbarch)->builtin_float; | |
3842 | append_composite_type_field (t, "f32", init_vector_type (elem, 2)); | |
3843 | elem = builtin_type (gdbarch)->builtin_double; | |
3844 | append_composite_type_field (t, "f64", elem); | |
3845 | ||
3846 | TYPE_VECTOR (t) = 1; | |
3847 | TYPE_NAME (t) = "neon_d"; | |
3848 | tdep->neon_double_type = t; | |
3849 | } | |
3850 | ||
3851 | return tdep->neon_double_type; | |
3852 | } | |
3853 | ||
3854 | /* FIXME: The vector types are not correctly ordered on big-endian | |
3855 | targets. Just as s0 is the low bits of d0, d0[0] is also the low | |
3856 | bits of d0 - regardless of what unit size is being held in d0. So | |
3857 | the offset of the first uint8 in d0 is 7, but the offset of the | |
3858 | first float is 4. This code works as-is for little-endian | |
3859 | targets. */ | |
3860 | ||
3861 | static struct type * | |
3862 | arm_neon_quad_type (struct gdbarch *gdbarch) | |
3863 | { | |
3864 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3865 | ||
3866 | if (tdep->neon_quad_type == NULL) | |
3867 | { | |
3868 | struct type *t, *elem; | |
3869 | ||
3870 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q", | |
3871 | TYPE_CODE_UNION); | |
3872 | elem = builtin_type (gdbarch)->builtin_uint8; | |
3873 | append_composite_type_field (t, "u8", init_vector_type (elem, 16)); | |
3874 | elem = builtin_type (gdbarch)->builtin_uint16; | |
3875 | append_composite_type_field (t, "u16", init_vector_type (elem, 8)); | |
3876 | elem = builtin_type (gdbarch)->builtin_uint32; | |
3877 | append_composite_type_field (t, "u32", init_vector_type (elem, 4)); | |
3878 | elem = builtin_type (gdbarch)->builtin_uint64; | |
3879 | append_composite_type_field (t, "u64", init_vector_type (elem, 2)); | |
3880 | elem = builtin_type (gdbarch)->builtin_float; | |
3881 | append_composite_type_field (t, "f32", init_vector_type (elem, 4)); | |
3882 | elem = builtin_type (gdbarch)->builtin_double; | |
3883 | append_composite_type_field (t, "f64", init_vector_type (elem, 2)); | |
3884 | ||
3885 | TYPE_VECTOR (t) = 1; | |
3886 | TYPE_NAME (t) = "neon_q"; | |
3887 | tdep->neon_quad_type = t; | |
3888 | } | |
3889 | ||
3890 | return tdep->neon_quad_type; | |
3891 | } | |
3892 | ||
34e8f22d RE |
3893 | /* Return the GDB type object for the "standard" data type of data in |
3894 | register N. */ | |
3895 | ||
3896 | static struct type * | |
7a5ea0d4 | 3897 | arm_register_type (struct gdbarch *gdbarch, int regnum) |
032758dc | 3898 | { |
58d6951d DJ |
3899 | int num_regs = gdbarch_num_regs (gdbarch); |
3900 | ||
3901 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
3902 | && regnum >= num_regs && regnum < num_regs + 32) | |
3903 | return builtin_type (gdbarch)->builtin_float; | |
3904 | ||
3905 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
3906 | && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16) | |
3907 | return arm_neon_quad_type (gdbarch); | |
3908 | ||
3909 | /* If the target description has register information, we are only | |
3910 | in this function so that we can override the types of | |
3911 | double-precision registers for NEON. */ | |
3912 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
3913 | { | |
3914 | struct type *t = tdesc_register_type (gdbarch, regnum); | |
3915 | ||
3916 | if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32 | |
3917 | && TYPE_CODE (t) == TYPE_CODE_FLT | |
3918 | && gdbarch_tdep (gdbarch)->have_neon) | |
3919 | return arm_neon_double_type (gdbarch); | |
3920 | else | |
3921 | return t; | |
3922 | } | |
3923 | ||
34e8f22d | 3924 | if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS) |
58d6951d DJ |
3925 | { |
3926 | if (!gdbarch_tdep (gdbarch)->have_fpa_registers) | |
3927 | return builtin_type (gdbarch)->builtin_void; | |
3928 | ||
3929 | return arm_ext_type (gdbarch); | |
3930 | } | |
e4c16157 | 3931 | else if (regnum == ARM_SP_REGNUM) |
0dfff4cb | 3932 | return builtin_type (gdbarch)->builtin_data_ptr; |
e4c16157 | 3933 | else if (regnum == ARM_PC_REGNUM) |
0dfff4cb | 3934 | return builtin_type (gdbarch)->builtin_func_ptr; |
ff6f572f DJ |
3935 | else if (regnum >= ARRAY_SIZE (arm_register_names)) |
3936 | /* These registers are only supported on targets which supply | |
3937 | an XML description. */ | |
df4df182 | 3938 | return builtin_type (gdbarch)->builtin_int0; |
032758dc | 3939 | else |
df4df182 | 3940 | return builtin_type (gdbarch)->builtin_uint32; |
032758dc AC |
3941 | } |
3942 | ||
ff6f572f DJ |
3943 | /* Map a DWARF register REGNUM onto the appropriate GDB register |
3944 | number. */ | |
3945 | ||
3946 | static int | |
d3f73121 | 3947 | arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
ff6f572f DJ |
3948 | { |
3949 | /* Core integer regs. */ | |
3950 | if (reg >= 0 && reg <= 15) | |
3951 | return reg; | |
3952 | ||
3953 | /* Legacy FPA encoding. These were once used in a way which | |
3954 | overlapped with VFP register numbering, so their use is | |
3955 | discouraged, but GDB doesn't support the ARM toolchain | |
3956 | which used them for VFP. */ | |
3957 | if (reg >= 16 && reg <= 23) | |
3958 | return ARM_F0_REGNUM + reg - 16; | |
3959 | ||
3960 | /* New assignments for the FPA registers. */ | |
3961 | if (reg >= 96 && reg <= 103) | |
3962 | return ARM_F0_REGNUM + reg - 96; | |
3963 | ||
3964 | /* WMMX register assignments. */ | |
3965 | if (reg >= 104 && reg <= 111) | |
3966 | return ARM_WCGR0_REGNUM + reg - 104; | |
3967 | ||
3968 | if (reg >= 112 && reg <= 127) | |
3969 | return ARM_WR0_REGNUM + reg - 112; | |
3970 | ||
3971 | if (reg >= 192 && reg <= 199) | |
3972 | return ARM_WC0_REGNUM + reg - 192; | |
3973 | ||
58d6951d DJ |
3974 | /* VFP v2 registers. A double precision value is actually |
3975 | in d1 rather than s2, but the ABI only defines numbering | |
3976 | for the single precision registers. This will "just work" | |
3977 | in GDB for little endian targets (we'll read eight bytes, | |
3978 | starting in s0 and then progressing to s1), but will be | |
3979 | reversed on big endian targets with VFP. This won't | |
3980 | be a problem for the new Neon quad registers; you're supposed | |
3981 | to use DW_OP_piece for those. */ | |
3982 | if (reg >= 64 && reg <= 95) | |
3983 | { | |
3984 | char name_buf[4]; | |
3985 | ||
3986 | sprintf (name_buf, "s%d", reg - 64); | |
3987 | return user_reg_map_name_to_regnum (gdbarch, name_buf, | |
3988 | strlen (name_buf)); | |
3989 | } | |
3990 | ||
3991 | /* VFP v3 / Neon registers. This range is also used for VFP v2 | |
3992 | registers, except that it now describes d0 instead of s0. */ | |
3993 | if (reg >= 256 && reg <= 287) | |
3994 | { | |
3995 | char name_buf[4]; | |
3996 | ||
3997 | sprintf (name_buf, "d%d", reg - 256); | |
3998 | return user_reg_map_name_to_regnum (gdbarch, name_buf, | |
3999 | strlen (name_buf)); | |
4000 | } | |
4001 | ||
ff6f572f DJ |
4002 | return -1; |
4003 | } | |
4004 | ||
26216b98 AC |
4005 | /* Map GDB internal REGNUM onto the Arm simulator register numbers. */ |
4006 | static int | |
e7faf938 | 4007 | arm_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
26216b98 AC |
4008 | { |
4009 | int reg = regnum; | |
e7faf938 | 4010 | gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch)); |
26216b98 | 4011 | |
ff6f572f DJ |
4012 | if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM) |
4013 | return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM; | |
4014 | ||
4015 | if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM) | |
4016 | return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM; | |
4017 | ||
4018 | if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM) | |
4019 | return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM; | |
4020 | ||
26216b98 AC |
4021 | if (reg < NUM_GREGS) |
4022 | return SIM_ARM_R0_REGNUM + reg; | |
4023 | reg -= NUM_GREGS; | |
4024 | ||
4025 | if (reg < NUM_FREGS) | |
4026 | return SIM_ARM_FP0_REGNUM + reg; | |
4027 | reg -= NUM_FREGS; | |
4028 | ||
4029 | if (reg < NUM_SREGS) | |
4030 | return SIM_ARM_FPS_REGNUM + reg; | |
4031 | reg -= NUM_SREGS; | |
4032 | ||
edefbb7c | 4033 | internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum); |
26216b98 | 4034 | } |
34e8f22d | 4035 | |
a37b3cc0 AC |
4036 | /* NOTE: cagney/2001-08-20: Both convert_from_extended() and |
4037 | convert_to_extended() use floatformat_arm_ext_littlebyte_bigword. | |
4038 | It is thought that this is is the floating-point register format on | |
4039 | little-endian systems. */ | |
c906108c | 4040 | |
ed9a39eb | 4041 | static void |
b508a996 | 4042 | convert_from_extended (const struct floatformat *fmt, const void *ptr, |
be8626e0 | 4043 | void *dbl, int endianess) |
c906108c | 4044 | { |
a37b3cc0 | 4045 | DOUBLEST d; |
be8626e0 MD |
4046 | |
4047 | if (endianess == BFD_ENDIAN_BIG) | |
a37b3cc0 AC |
4048 | floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d); |
4049 | else | |
4050 | floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4051 | ptr, &d); | |
b508a996 | 4052 | floatformat_from_doublest (fmt, &d, dbl); |
c906108c SS |
4053 | } |
4054 | ||
34e8f22d | 4055 | static void |
be8626e0 MD |
4056 | convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr, |
4057 | int endianess) | |
c906108c | 4058 | { |
a37b3cc0 | 4059 | DOUBLEST d; |
be8626e0 | 4060 | |
b508a996 | 4061 | floatformat_to_doublest (fmt, ptr, &d); |
be8626e0 | 4062 | if (endianess == BFD_ENDIAN_BIG) |
a37b3cc0 AC |
4063 | floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl); |
4064 | else | |
4065 | floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword, | |
4066 | &d, dbl); | |
c906108c | 4067 | } |
ed9a39eb | 4068 | |
c906108c | 4069 | static int |
ed9a39eb | 4070 | condition_true (unsigned long cond, unsigned long status_reg) |
c906108c SS |
4071 | { |
4072 | if (cond == INST_AL || cond == INST_NV) | |
4073 | return 1; | |
4074 | ||
4075 | switch (cond) | |
4076 | { | |
4077 | case INST_EQ: | |
4078 | return ((status_reg & FLAG_Z) != 0); | |
4079 | case INST_NE: | |
4080 | return ((status_reg & FLAG_Z) == 0); | |
4081 | case INST_CS: | |
4082 | return ((status_reg & FLAG_C) != 0); | |
4083 | case INST_CC: | |
4084 | return ((status_reg & FLAG_C) == 0); | |
4085 | case INST_MI: | |
4086 | return ((status_reg & FLAG_N) != 0); | |
4087 | case INST_PL: | |
4088 | return ((status_reg & FLAG_N) == 0); | |
4089 | case INST_VS: | |
4090 | return ((status_reg & FLAG_V) != 0); | |
4091 | case INST_VC: | |
4092 | return ((status_reg & FLAG_V) == 0); | |
4093 | case INST_HI: | |
4094 | return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C); | |
4095 | case INST_LS: | |
4096 | return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C); | |
4097 | case INST_GE: | |
4098 | return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)); | |
4099 | case INST_LT: | |
4100 | return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)); | |
4101 | case INST_GT: | |
f8bf5763 PM |
4102 | return (((status_reg & FLAG_Z) == 0) |
4103 | && (((status_reg & FLAG_N) == 0) | |
4104 | == ((status_reg & FLAG_V) == 0))); | |
c906108c | 4105 | case INST_LE: |
f8bf5763 PM |
4106 | return (((status_reg & FLAG_Z) != 0) |
4107 | || (((status_reg & FLAG_N) == 0) | |
4108 | != ((status_reg & FLAG_V) == 0))); | |
c906108c SS |
4109 | } |
4110 | return 1; | |
4111 | } | |
4112 | ||
c906108c | 4113 | static unsigned long |
0b1b3e42 UW |
4114 | shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry, |
4115 | unsigned long pc_val, unsigned long status_reg) | |
c906108c SS |
4116 | { |
4117 | unsigned long res, shift; | |
4118 | int rm = bits (inst, 0, 3); | |
4119 | unsigned long shifttype = bits (inst, 5, 6); | |
c5aa993b JM |
4120 | |
4121 | if (bit (inst, 4)) | |
c906108c SS |
4122 | { |
4123 | int rs = bits (inst, 8, 11); | |
0b1b3e42 UW |
4124 | shift = (rs == 15 ? pc_val + 8 |
4125 | : get_frame_register_unsigned (frame, rs)) & 0xFF; | |
c906108c SS |
4126 | } |
4127 | else | |
4128 | shift = bits (inst, 7, 11); | |
c5aa993b | 4129 | |
bf9f652a | 4130 | res = (rm == ARM_PC_REGNUM |
0d39a070 | 4131 | ? (pc_val + (bit (inst, 4) ? 12 : 8)) |
0b1b3e42 | 4132 | : get_frame_register_unsigned (frame, rm)); |
c906108c SS |
4133 | |
4134 | switch (shifttype) | |
4135 | { | |
c5aa993b | 4136 | case 0: /* LSL */ |
c906108c SS |
4137 | res = shift >= 32 ? 0 : res << shift; |
4138 | break; | |
c5aa993b JM |
4139 | |
4140 | case 1: /* LSR */ | |
c906108c SS |
4141 | res = shift >= 32 ? 0 : res >> shift; |
4142 | break; | |
4143 | ||
c5aa993b JM |
4144 | case 2: /* ASR */ |
4145 | if (shift >= 32) | |
4146 | shift = 31; | |
c906108c SS |
4147 | res = ((res & 0x80000000L) |
4148 | ? ~((~res) >> shift) : res >> shift); | |
4149 | break; | |
4150 | ||
c5aa993b | 4151 | case 3: /* ROR/RRX */ |
c906108c SS |
4152 | shift &= 31; |
4153 | if (shift == 0) | |
4154 | res = (res >> 1) | (carry ? 0x80000000L : 0); | |
4155 | else | |
c5aa993b | 4156 | res = (res >> shift) | (res << (32 - shift)); |
c906108c SS |
4157 | break; |
4158 | } | |
4159 | ||
4160 | return res & 0xffffffff; | |
4161 | } | |
4162 | ||
c906108c SS |
4163 | /* Return number of 1-bits in VAL. */ |
4164 | ||
4165 | static int | |
ed9a39eb | 4166 | bitcount (unsigned long val) |
c906108c SS |
4167 | { |
4168 | int nbits; | |
4169 | for (nbits = 0; val != 0; nbits++) | |
0963b4bd | 4170 | val &= val - 1; /* Delete rightmost 1-bit in val. */ |
c906108c SS |
4171 | return nbits; |
4172 | } | |
4173 | ||
177321bd DJ |
4174 | /* Return the size in bytes of the complete Thumb instruction whose |
4175 | first halfword is INST1. */ | |
4176 | ||
4177 | static int | |
4178 | thumb_insn_size (unsigned short inst1) | |
4179 | { | |
4180 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) | |
4181 | return 4; | |
4182 | else | |
4183 | return 2; | |
4184 | } | |
4185 | ||
4186 | static int | |
4187 | thumb_advance_itstate (unsigned int itstate) | |
4188 | { | |
4189 | /* Preserve IT[7:5], the first three bits of the condition. Shift | |
4190 | the upcoming condition flags left by one bit. */ | |
4191 | itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f); | |
4192 | ||
4193 | /* If we have finished the IT block, clear the state. */ | |
4194 | if ((itstate & 0x0f) == 0) | |
4195 | itstate = 0; | |
4196 | ||
4197 | return itstate; | |
4198 | } | |
4199 | ||
4200 | /* Find the next PC after the current instruction executes. In some | |
4201 | cases we can not statically determine the answer (see the IT state | |
4202 | handling in this function); in that case, a breakpoint may be | |
4203 | inserted in addition to the returned PC, which will be used to set | |
4204 | another breakpoint by our caller. */ | |
4205 | ||
ad527d2e | 4206 | static CORE_ADDR |
18819fa6 | 4207 | thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4208 | { |
2af46ca0 | 4209 | struct gdbarch *gdbarch = get_frame_arch (frame); |
177321bd | 4210 | struct address_space *aspace = get_frame_address_space (frame); |
e17a4113 UW |
4211 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4212 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c5aa993b | 4213 | unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */ |
e17a4113 | 4214 | unsigned short inst1; |
0963b4bd | 4215 | CORE_ADDR nextpc = pc + 2; /* Default is next instruction. */ |
c906108c | 4216 | unsigned long offset; |
177321bd | 4217 | ULONGEST status, itstate; |
c906108c | 4218 | |
50e98be4 DJ |
4219 | nextpc = MAKE_THUMB_ADDR (nextpc); |
4220 | pc_val = MAKE_THUMB_ADDR (pc_val); | |
4221 | ||
e17a4113 | 4222 | inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code); |
9d4fde75 | 4223 | |
9dca5578 DJ |
4224 | /* Thumb-2 conditional execution support. There are eight bits in |
4225 | the CPSR which describe conditional execution state. Once | |
4226 | reconstructed (they're in a funny order), the low five bits | |
4227 | describe the low bit of the condition for each instruction and | |
4228 | how many instructions remain. The high three bits describe the | |
4229 | base condition. One of the low four bits will be set if an IT | |
4230 | block is active. These bits read as zero on earlier | |
4231 | processors. */ | |
4232 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); | |
177321bd | 4233 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); |
9dca5578 | 4234 | |
177321bd DJ |
4235 | /* If-Then handling. On GNU/Linux, where this routine is used, we |
4236 | use an undefined instruction as a breakpoint. Unlike BKPT, IT | |
4237 | can disable execution of the undefined instruction. So we might | |
4238 | miss the breakpoint if we set it on a skipped conditional | |
4239 | instruction. Because conditional instructions can change the | |
4240 | flags, affecting the execution of further instructions, we may | |
4241 | need to set two breakpoints. */ | |
9dca5578 | 4242 | |
177321bd DJ |
4243 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL) |
4244 | { | |
4245 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
4246 | { | |
4247 | /* An IT instruction. Because this instruction does not | |
4248 | modify the flags, we can accurately predict the next | |
4249 | executed instruction. */ | |
4250 | itstate = inst1 & 0x00ff; | |
4251 | pc += thumb_insn_size (inst1); | |
4252 | ||
4253 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4254 | { | |
0963b4bd MS |
4255 | inst1 = read_memory_unsigned_integer (pc, 2, |
4256 | byte_order_for_code); | |
177321bd DJ |
4257 | pc += thumb_insn_size (inst1); |
4258 | itstate = thumb_advance_itstate (itstate); | |
4259 | } | |
4260 | ||
50e98be4 | 4261 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4262 | } |
4263 | else if (itstate != 0) | |
4264 | { | |
4265 | /* We are in a conditional block. Check the condition. */ | |
4266 | if (! condition_true (itstate >> 4, status)) | |
4267 | { | |
4268 | /* Advance to the next executed instruction. */ | |
4269 | pc += thumb_insn_size (inst1); | |
4270 | itstate = thumb_advance_itstate (itstate); | |
4271 | ||
4272 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) | |
4273 | { | |
0963b4bd MS |
4274 | inst1 = read_memory_unsigned_integer (pc, 2, |
4275 | byte_order_for_code); | |
177321bd DJ |
4276 | pc += thumb_insn_size (inst1); |
4277 | itstate = thumb_advance_itstate (itstate); | |
4278 | } | |
4279 | ||
50e98be4 | 4280 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4281 | } |
4282 | else if ((itstate & 0x0f) == 0x08) | |
4283 | { | |
4284 | /* This is the last instruction of the conditional | |
4285 | block, and it is executed. We can handle it normally | |
4286 | because the following instruction is not conditional, | |
4287 | and we must handle it normally because it is | |
4288 | permitted to branch. Fall through. */ | |
4289 | } | |
4290 | else | |
4291 | { | |
4292 | int cond_negated; | |
4293 | ||
4294 | /* There are conditional instructions after this one. | |
4295 | If this instruction modifies the flags, then we can | |
4296 | not predict what the next executed instruction will | |
4297 | be. Fortunately, this instruction is architecturally | |
4298 | forbidden to branch; we know it will fall through. | |
4299 | Start by skipping past it. */ | |
4300 | pc += thumb_insn_size (inst1); | |
4301 | itstate = thumb_advance_itstate (itstate); | |
4302 | ||
4303 | /* Set a breakpoint on the following instruction. */ | |
4304 | gdb_assert ((itstate & 0x0f) != 0); | |
18819fa6 UW |
4305 | arm_insert_single_step_breakpoint (gdbarch, aspace, |
4306 | MAKE_THUMB_ADDR (pc)); | |
177321bd DJ |
4307 | cond_negated = (itstate >> 4) & 1; |
4308 | ||
4309 | /* Skip all following instructions with the same | |
4310 | condition. If there is a later instruction in the IT | |
4311 | block with the opposite condition, set the other | |
4312 | breakpoint there. If not, then set a breakpoint on | |
4313 | the instruction after the IT block. */ | |
4314 | do | |
4315 | { | |
0963b4bd MS |
4316 | inst1 = read_memory_unsigned_integer (pc, 2, |
4317 | byte_order_for_code); | |
177321bd DJ |
4318 | pc += thumb_insn_size (inst1); |
4319 | itstate = thumb_advance_itstate (itstate); | |
4320 | } | |
4321 | while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated); | |
4322 | ||
50e98be4 | 4323 | return MAKE_THUMB_ADDR (pc); |
177321bd DJ |
4324 | } |
4325 | } | |
4326 | } | |
4327 | else if (itstate & 0x0f) | |
9dca5578 DJ |
4328 | { |
4329 | /* We are in a conditional block. Check the condition. */ | |
177321bd | 4330 | int cond = itstate >> 4; |
9dca5578 DJ |
4331 | |
4332 | if (! condition_true (cond, status)) | |
4333 | { | |
4334 | /* Advance to the next instruction. All the 32-bit | |
4335 | instructions share a common prefix. */ | |
4336 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) | |
50e98be4 | 4337 | return MAKE_THUMB_ADDR (pc + 4); |
9dca5578 | 4338 | else |
50e98be4 | 4339 | return MAKE_THUMB_ADDR (pc + 2); |
9dca5578 | 4340 | } |
177321bd DJ |
4341 | |
4342 | /* Otherwise, handle the instruction normally. */ | |
9dca5578 DJ |
4343 | } |
4344 | ||
c906108c SS |
4345 | if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */ |
4346 | { | |
4347 | CORE_ADDR sp; | |
4348 | ||
4349 | /* Fetch the saved PC from the stack. It's stored above | |
4350 | all of the other registers. */ | |
f0c9063c | 4351 | offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE; |
0b1b3e42 | 4352 | sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM); |
e17a4113 | 4353 | nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order); |
c906108c SS |
4354 | } |
4355 | else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */ | |
4356 | { | |
c5aa993b | 4357 | unsigned long cond = bits (inst1, 8, 11); |
25b41d01 YQ |
4358 | if (cond == 0x0f) /* 0x0f = SWI */ |
4359 | { | |
4360 | struct gdbarch_tdep *tdep; | |
4361 | tdep = gdbarch_tdep (gdbarch); | |
4362 | ||
4363 | if (tdep->syscall_next_pc != NULL) | |
4364 | nextpc = tdep->syscall_next_pc (frame); | |
4365 | ||
4366 | } | |
4367 | else if (cond != 0x0f && condition_true (cond, status)) | |
c906108c SS |
4368 | nextpc = pc_val + (sbits (inst1, 0, 7) << 1); |
4369 | } | |
4370 | else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */ | |
4371 | { | |
4372 | nextpc = pc_val + (sbits (inst1, 0, 10) << 1); | |
4373 | } | |
9dca5578 | 4374 | else if ((inst1 & 0xe000) == 0xe000) /* 32-bit instruction */ |
c906108c | 4375 | { |
e17a4113 UW |
4376 | unsigned short inst2; |
4377 | inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); | |
9dca5578 DJ |
4378 | |
4379 | /* Default to the next instruction. */ | |
4380 | nextpc = pc + 4; | |
50e98be4 | 4381 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4382 | |
4383 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) | |
4384 | { | |
4385 | /* Branches and miscellaneous control instructions. */ | |
4386 | ||
4387 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) | |
4388 | { | |
4389 | /* B, BL, BLX. */ | |
4390 | int j1, j2, imm1, imm2; | |
4391 | ||
4392 | imm1 = sbits (inst1, 0, 10); | |
4393 | imm2 = bits (inst2, 0, 10); | |
4394 | j1 = bit (inst2, 13); | |
4395 | j2 = bit (inst2, 11); | |
4396 | ||
4397 | offset = ((imm1 << 12) + (imm2 << 1)); | |
4398 | offset ^= ((!j2) << 22) | ((!j1) << 23); | |
4399 | ||
4400 | nextpc = pc_val + offset; | |
4401 | /* For BLX make sure to clear the low bits. */ | |
4402 | if (bit (inst2, 12) == 0) | |
4403 | nextpc = nextpc & 0xfffffffc; | |
4404 | } | |
4405 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) | |
4406 | { | |
4407 | /* SUBS PC, LR, #imm8. */ | |
4408 | nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM); | |
4409 | nextpc -= inst2 & 0x00ff; | |
4410 | } | |
4069ebbe | 4411 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) |
9dca5578 DJ |
4412 | { |
4413 | /* Conditional branch. */ | |
4414 | if (condition_true (bits (inst1, 6, 9), status)) | |
4415 | { | |
4416 | int sign, j1, j2, imm1, imm2; | |
4417 | ||
4418 | sign = sbits (inst1, 10, 10); | |
4419 | imm1 = bits (inst1, 0, 5); | |
4420 | imm2 = bits (inst2, 0, 10); | |
4421 | j1 = bit (inst2, 13); | |
4422 | j2 = bit (inst2, 11); | |
4423 | ||
4424 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); | |
4425 | offset += (imm1 << 12) + (imm2 << 1); | |
4426 | ||
4427 | nextpc = pc_val + offset; | |
4428 | } | |
4429 | } | |
4430 | } | |
4431 | else if ((inst1 & 0xfe50) == 0xe810) | |
4432 | { | |
4433 | /* Load multiple or RFE. */ | |
4434 | int rn, offset, load_pc = 1; | |
4435 | ||
4436 | rn = bits (inst1, 0, 3); | |
4437 | if (bit (inst1, 7) && !bit (inst1, 8)) | |
4438 | { | |
4439 | /* LDMIA or POP */ | |
4440 | if (!bit (inst2, 15)) | |
4441 | load_pc = 0; | |
4442 | offset = bitcount (inst2) * 4 - 4; | |
4443 | } | |
4444 | else if (!bit (inst1, 7) && bit (inst1, 8)) | |
4445 | { | |
4446 | /* LDMDB */ | |
4447 | if (!bit (inst2, 15)) | |
4448 | load_pc = 0; | |
4449 | offset = -4; | |
4450 | } | |
4451 | else if (bit (inst1, 7) && bit (inst1, 8)) | |
4452 | { | |
4453 | /* RFEIA */ | |
4454 | offset = 0; | |
4455 | } | |
4456 | else if (!bit (inst1, 7) && !bit (inst1, 8)) | |
4457 | { | |
4458 | /* RFEDB */ | |
4459 | offset = -8; | |
4460 | } | |
4461 | else | |
4462 | load_pc = 0; | |
4463 | ||
4464 | if (load_pc) | |
4465 | { | |
4466 | CORE_ADDR addr = get_frame_register_unsigned (frame, rn); | |
4467 | nextpc = get_frame_memory_unsigned (frame, addr + offset, 4); | |
4468 | } | |
4469 | } | |
4470 | else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) | |
4471 | { | |
4472 | /* MOV PC or MOVS PC. */ | |
4473 | nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); | |
50e98be4 | 4474 | nextpc = MAKE_THUMB_ADDR (nextpc); |
9dca5578 DJ |
4475 | } |
4476 | else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) | |
4477 | { | |
4478 | /* LDR PC. */ | |
4479 | CORE_ADDR base; | |
4480 | int rn, load_pc = 1; | |
4481 | ||
4482 | rn = bits (inst1, 0, 3); | |
4483 | base = get_frame_register_unsigned (frame, rn); | |
bf9f652a | 4484 | if (rn == ARM_PC_REGNUM) |
9dca5578 DJ |
4485 | { |
4486 | base = (base + 4) & ~(CORE_ADDR) 0x3; | |
4487 | if (bit (inst1, 7)) | |
4488 | base += bits (inst2, 0, 11); | |
4489 | else | |
4490 | base -= bits (inst2, 0, 11); | |
4491 | } | |
4492 | else if (bit (inst1, 7)) | |
4493 | base += bits (inst2, 0, 11); | |
4494 | else if (bit (inst2, 11)) | |
4495 | { | |
4496 | if (bit (inst2, 10)) | |
4497 | { | |
4498 | if (bit (inst2, 9)) | |
4499 | base += bits (inst2, 0, 7); | |
4500 | else | |
4501 | base -= bits (inst2, 0, 7); | |
4502 | } | |
4503 | } | |
4504 | else if ((inst2 & 0x0fc0) == 0x0000) | |
4505 | { | |
4506 | int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3); | |
4507 | base += get_frame_register_unsigned (frame, rm) << shift; | |
4508 | } | |
4509 | else | |
4510 | /* Reserved. */ | |
4511 | load_pc = 0; | |
4512 | ||
4513 | if (load_pc) | |
4514 | nextpc = get_frame_memory_unsigned (frame, base, 4); | |
4515 | } | |
4516 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) | |
4517 | { | |
4518 | /* TBB. */ | |
d476da0e RE |
4519 | CORE_ADDR tbl_reg, table, offset, length; |
4520 | ||
4521 | tbl_reg = bits (inst1, 0, 3); | |
4522 | if (tbl_reg == 0x0f) | |
4523 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4524 | else | |
4525 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4526 | |
9dca5578 DJ |
4527 | offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4528 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 1); | |
4529 | nextpc = pc_val + length; | |
4530 | } | |
d476da0e | 4531 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) |
9dca5578 DJ |
4532 | { |
4533 | /* TBH. */ | |
d476da0e RE |
4534 | CORE_ADDR tbl_reg, table, offset, length; |
4535 | ||
4536 | tbl_reg = bits (inst1, 0, 3); | |
4537 | if (tbl_reg == 0x0f) | |
4538 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ | |
4539 | else | |
4540 | table = get_frame_register_unsigned (frame, tbl_reg); | |
9dca5578 | 4541 | |
9dca5578 DJ |
4542 | offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
4543 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 2); | |
4544 | nextpc = pc_val + length; | |
4545 | } | |
c906108c | 4546 | } |
aa17d93e | 4547 | else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */ |
9498281f DJ |
4548 | { |
4549 | if (bits (inst1, 3, 6) == 0x0f) | |
4550 | nextpc = pc_val; | |
4551 | else | |
0b1b3e42 | 4552 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); |
9498281f | 4553 | } |
ad8b5167 UW |
4554 | else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */ |
4555 | { | |
4556 | if (bits (inst1, 3, 6) == 0x0f) | |
4557 | nextpc = pc_val; | |
4558 | else | |
4559 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); | |
4560 | ||
4561 | nextpc = MAKE_THUMB_ADDR (nextpc); | |
4562 | } | |
9dca5578 DJ |
4563 | else if ((inst1 & 0xf500) == 0xb100) |
4564 | { | |
4565 | /* CBNZ or CBZ. */ | |
4566 | int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1); | |
4567 | ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2)); | |
4568 | ||
4569 | if (bit (inst1, 11) && reg != 0) | |
4570 | nextpc = pc_val + imm; | |
4571 | else if (!bit (inst1, 11) && reg == 0) | |
4572 | nextpc = pc_val + imm; | |
4573 | } | |
c906108c SS |
4574 | return nextpc; |
4575 | } | |
4576 | ||
50e98be4 | 4577 | /* Get the raw next address. PC is the current program counter, in |
18819fa6 | 4578 | FRAME, which is assumed to be executing in ARM mode. |
50e98be4 DJ |
4579 | |
4580 | The value returned has the execution state of the next instruction | |
4581 | encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is | |
4582 | in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory | |
0963b4bd MS |
4583 | address. */ |
4584 | ||
50e98be4 | 4585 | static CORE_ADDR |
18819fa6 | 4586 | arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 4587 | { |
2af46ca0 | 4588 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
4589 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4590 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); | |
c906108c SS |
4591 | unsigned long pc_val; |
4592 | unsigned long this_instr; | |
4593 | unsigned long status; | |
4594 | CORE_ADDR nextpc; | |
4595 | ||
c906108c | 4596 | pc_val = (unsigned long) pc; |
e17a4113 | 4597 | this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
9d4fde75 | 4598 | |
0b1b3e42 | 4599 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
c5aa993b | 4600 | nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */ |
c906108c | 4601 | |
daddc3c1 DJ |
4602 | if (bits (this_instr, 28, 31) == INST_NV) |
4603 | switch (bits (this_instr, 24, 27)) | |
4604 | { | |
4605 | case 0xa: | |
4606 | case 0xb: | |
4607 | { | |
4608 | /* Branch with Link and change to Thumb. */ | |
4609 | nextpc = BranchDest (pc, this_instr); | |
4610 | nextpc |= bit (this_instr, 24) << 1; | |
50e98be4 | 4611 | nextpc = MAKE_THUMB_ADDR (nextpc); |
daddc3c1 DJ |
4612 | break; |
4613 | } | |
4614 | case 0xc: | |
4615 | case 0xd: | |
4616 | case 0xe: | |
4617 | /* Coprocessor register transfer. */ | |
4618 | if (bits (this_instr, 12, 15) == 15) | |
4619 | error (_("Invalid update to pc in instruction")); | |
4620 | break; | |
4621 | } | |
4622 | else if (condition_true (bits (this_instr, 28, 31), status)) | |
c906108c SS |
4623 | { |
4624 | switch (bits (this_instr, 24, 27)) | |
4625 | { | |
c5aa993b | 4626 | case 0x0: |
94c30b78 | 4627 | case 0x1: /* data processing */ |
c5aa993b JM |
4628 | case 0x2: |
4629 | case 0x3: | |
c906108c SS |
4630 | { |
4631 | unsigned long operand1, operand2, result = 0; | |
4632 | unsigned long rn; | |
4633 | int c; | |
c5aa993b | 4634 | |
c906108c SS |
4635 | if (bits (this_instr, 12, 15) != 15) |
4636 | break; | |
4637 | ||
4638 | if (bits (this_instr, 22, 25) == 0 | |
c5aa993b | 4639 | && bits (this_instr, 4, 7) == 9) /* multiply */ |
edefbb7c | 4640 | error (_("Invalid update to pc in instruction")); |
c906108c | 4641 | |
9498281f | 4642 | /* BX <reg>, BLX <reg> */ |
e150acc7 PB |
4643 | if (bits (this_instr, 4, 27) == 0x12fff1 |
4644 | || bits (this_instr, 4, 27) == 0x12fff3) | |
9498281f DJ |
4645 | { |
4646 | rn = bits (this_instr, 0, 3); | |
bf9f652a YQ |
4647 | nextpc = ((rn == ARM_PC_REGNUM) |
4648 | ? (pc_val + 8) | |
4649 | : get_frame_register_unsigned (frame, rn)); | |
4650 | ||
9498281f DJ |
4651 | return nextpc; |
4652 | } | |
4653 | ||
0963b4bd | 4654 | /* Multiply into PC. */ |
c906108c SS |
4655 | c = (status & FLAG_C) ? 1 : 0; |
4656 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4657 | operand1 = ((rn == ARM_PC_REGNUM) |
4658 | ? (pc_val + 8) | |
4659 | : get_frame_register_unsigned (frame, rn)); | |
c5aa993b | 4660 | |
c906108c SS |
4661 | if (bit (this_instr, 25)) |
4662 | { | |
4663 | unsigned long immval = bits (this_instr, 0, 7); | |
4664 | unsigned long rotate = 2 * bits (this_instr, 8, 11); | |
c5aa993b JM |
4665 | operand2 = ((immval >> rotate) | (immval << (32 - rotate))) |
4666 | & 0xffffffff; | |
c906108c | 4667 | } |
0963b4bd MS |
4668 | else /* operand 2 is a shifted register. */ |
4669 | operand2 = shifted_reg_val (frame, this_instr, c, | |
4670 | pc_val, status); | |
c5aa993b | 4671 | |
c906108c SS |
4672 | switch (bits (this_instr, 21, 24)) |
4673 | { | |
c5aa993b | 4674 | case 0x0: /*and */ |
c906108c SS |
4675 | result = operand1 & operand2; |
4676 | break; | |
4677 | ||
c5aa993b | 4678 | case 0x1: /*eor */ |
c906108c SS |
4679 | result = operand1 ^ operand2; |
4680 | break; | |
4681 | ||
c5aa993b | 4682 | case 0x2: /*sub */ |
c906108c SS |
4683 | result = operand1 - operand2; |
4684 | break; | |
4685 | ||
c5aa993b | 4686 | case 0x3: /*rsb */ |
c906108c SS |
4687 | result = operand2 - operand1; |
4688 | break; | |
4689 | ||
c5aa993b | 4690 | case 0x4: /*add */ |
c906108c SS |
4691 | result = operand1 + operand2; |
4692 | break; | |
4693 | ||
c5aa993b | 4694 | case 0x5: /*adc */ |
c906108c SS |
4695 | result = operand1 + operand2 + c; |
4696 | break; | |
4697 | ||
c5aa993b | 4698 | case 0x6: /*sbc */ |
c906108c SS |
4699 | result = operand1 - operand2 + c; |
4700 | break; | |
4701 | ||
c5aa993b | 4702 | case 0x7: /*rsc */ |
c906108c SS |
4703 | result = operand2 - operand1 + c; |
4704 | break; | |
4705 | ||
c5aa993b JM |
4706 | case 0x8: |
4707 | case 0x9: | |
4708 | case 0xa: | |
4709 | case 0xb: /* tst, teq, cmp, cmn */ | |
c906108c SS |
4710 | result = (unsigned long) nextpc; |
4711 | break; | |
4712 | ||
c5aa993b | 4713 | case 0xc: /*orr */ |
c906108c SS |
4714 | result = operand1 | operand2; |
4715 | break; | |
4716 | ||
c5aa993b | 4717 | case 0xd: /*mov */ |
c906108c SS |
4718 | /* Always step into a function. */ |
4719 | result = operand2; | |
c5aa993b | 4720 | break; |
c906108c | 4721 | |
c5aa993b | 4722 | case 0xe: /*bic */ |
c906108c SS |
4723 | result = operand1 & ~operand2; |
4724 | break; | |
4725 | ||
c5aa993b | 4726 | case 0xf: /*mvn */ |
c906108c SS |
4727 | result = ~operand2; |
4728 | break; | |
4729 | } | |
c906108c | 4730 | |
50e98be4 DJ |
4731 | /* In 26-bit APCS the bottom two bits of the result are |
4732 | ignored, and we always end up in ARM state. */ | |
4733 | if (!arm_apcs_32) | |
4734 | nextpc = arm_addr_bits_remove (gdbarch, result); | |
4735 | else | |
4736 | nextpc = result; | |
4737 | ||
c906108c SS |
4738 | break; |
4739 | } | |
c5aa993b JM |
4740 | |
4741 | case 0x4: | |
4742 | case 0x5: /* data transfer */ | |
4743 | case 0x6: | |
4744 | case 0x7: | |
c906108c SS |
4745 | if (bit (this_instr, 20)) |
4746 | { | |
4747 | /* load */ | |
4748 | if (bits (this_instr, 12, 15) == 15) | |
4749 | { | |
4750 | /* rd == pc */ | |
c5aa993b | 4751 | unsigned long rn; |
c906108c | 4752 | unsigned long base; |
c5aa993b | 4753 | |
c906108c | 4754 | if (bit (this_instr, 22)) |
edefbb7c | 4755 | error (_("Invalid update to pc in instruction")); |
c906108c SS |
4756 | |
4757 | /* byte write to PC */ | |
4758 | rn = bits (this_instr, 16, 19); | |
bf9f652a YQ |
4759 | base = ((rn == ARM_PC_REGNUM) |
4760 | ? (pc_val + 8) | |
4761 | : get_frame_register_unsigned (frame, rn)); | |
4762 | ||
c906108c SS |
4763 | if (bit (this_instr, 24)) |
4764 | { | |
4765 | /* pre-indexed */ | |
4766 | int c = (status & FLAG_C) ? 1 : 0; | |
4767 | unsigned long offset = | |
c5aa993b | 4768 | (bit (this_instr, 25) |
0b1b3e42 | 4769 | ? shifted_reg_val (frame, this_instr, c, pc_val, status) |
c5aa993b | 4770 | : bits (this_instr, 0, 11)); |
c906108c SS |
4771 | |
4772 | if (bit (this_instr, 23)) | |
4773 | base += offset; | |
4774 | else | |
4775 | base -= offset; | |
4776 | } | |
c5aa993b | 4777 | nextpc = (CORE_ADDR) read_memory_integer ((CORE_ADDR) base, |
e17a4113 | 4778 | 4, byte_order); |
c906108c SS |
4779 | } |
4780 | } | |
4781 | break; | |
c5aa993b JM |
4782 | |
4783 | case 0x8: | |
4784 | case 0x9: /* block transfer */ | |
c906108c SS |
4785 | if (bit (this_instr, 20)) |
4786 | { | |
4787 | /* LDM */ | |
4788 | if (bit (this_instr, 15)) | |
4789 | { | |
4790 | /* loading pc */ | |
4791 | int offset = 0; | |
4792 | ||
4793 | if (bit (this_instr, 23)) | |
4794 | { | |
4795 | /* up */ | |
4796 | unsigned long reglist = bits (this_instr, 0, 14); | |
4797 | offset = bitcount (reglist) * 4; | |
c5aa993b | 4798 | if (bit (this_instr, 24)) /* pre */ |
c906108c SS |
4799 | offset += 4; |
4800 | } | |
4801 | else if (bit (this_instr, 24)) | |
4802 | offset = -4; | |
c5aa993b | 4803 | |
c906108c | 4804 | { |
c5aa993b | 4805 | unsigned long rn_val = |
0b1b3e42 UW |
4806 | get_frame_register_unsigned (frame, |
4807 | bits (this_instr, 16, 19)); | |
c906108c SS |
4808 | nextpc = |
4809 | (CORE_ADDR) read_memory_integer ((CORE_ADDR) (rn_val | |
c5aa993b | 4810 | + offset), |
e17a4113 | 4811 | 4, byte_order); |
c906108c | 4812 | } |
c906108c SS |
4813 | } |
4814 | } | |
4815 | break; | |
c5aa993b JM |
4816 | |
4817 | case 0xb: /* branch & link */ | |
4818 | case 0xa: /* branch */ | |
c906108c SS |
4819 | { |
4820 | nextpc = BranchDest (pc, this_instr); | |
c906108c SS |
4821 | break; |
4822 | } | |
c5aa993b JM |
4823 | |
4824 | case 0xc: | |
4825 | case 0xd: | |
4826 | case 0xe: /* coproc ops */ | |
25b41d01 | 4827 | break; |
c5aa993b | 4828 | case 0xf: /* SWI */ |
25b41d01 YQ |
4829 | { |
4830 | struct gdbarch_tdep *tdep; | |
4831 | tdep = gdbarch_tdep (gdbarch); | |
4832 | ||
4833 | if (tdep->syscall_next_pc != NULL) | |
4834 | nextpc = tdep->syscall_next_pc (frame); | |
4835 | ||
4836 | } | |
c906108c SS |
4837 | break; |
4838 | ||
4839 | default: | |
edefbb7c | 4840 | fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n")); |
c906108c SS |
4841 | return (pc); |
4842 | } | |
4843 | } | |
4844 | ||
4845 | return nextpc; | |
4846 | } | |
4847 | ||
18819fa6 UW |
4848 | /* Determine next PC after current instruction executes. Will call either |
4849 | arm_get_next_pc_raw or thumb_get_next_pc_raw. Error out if infinite | |
4850 | loop is detected. */ | |
4851 | ||
50e98be4 DJ |
4852 | CORE_ADDR |
4853 | arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc) | |
4854 | { | |
18819fa6 UW |
4855 | CORE_ADDR nextpc; |
4856 | ||
4857 | if (arm_frame_is_thumb (frame)) | |
4858 | { | |
4859 | nextpc = thumb_get_next_pc_raw (frame, pc); | |
4860 | if (nextpc == MAKE_THUMB_ADDR (pc)) | |
4861 | error (_("Infinite loop detected")); | |
4862 | } | |
4863 | else | |
4864 | { | |
4865 | nextpc = arm_get_next_pc_raw (frame, pc); | |
4866 | if (nextpc == pc) | |
4867 | error (_("Infinite loop detected")); | |
4868 | } | |
4869 | ||
50e98be4 DJ |
4870 | return nextpc; |
4871 | } | |
4872 | ||
18819fa6 UW |
4873 | /* Like insert_single_step_breakpoint, but make sure we use a breakpoint |
4874 | of the appropriate mode (as encoded in the PC value), even if this | |
4875 | differs from what would be expected according to the symbol tables. */ | |
4876 | ||
4877 | void | |
4878 | arm_insert_single_step_breakpoint (struct gdbarch *gdbarch, | |
4879 | struct address_space *aspace, | |
4880 | CORE_ADDR pc) | |
4881 | { | |
4882 | struct cleanup *old_chain | |
4883 | = make_cleanup_restore_integer (&arm_override_mode); | |
4884 | ||
4885 | arm_override_mode = IS_THUMB_ADDR (pc); | |
4886 | pc = gdbarch_addr_bits_remove (gdbarch, pc); | |
4887 | ||
4888 | insert_single_step_breakpoint (gdbarch, aspace, pc); | |
4889 | ||
4890 | do_cleanups (old_chain); | |
4891 | } | |
4892 | ||
9512d7fd FN |
4893 | /* single_step() is called just before we want to resume the inferior, |
4894 | if we want to single-step it but there is no hardware or kernel | |
4895 | single-step support. We find the target of the coming instruction | |
e0cd558a | 4896 | and breakpoint it. */ |
9512d7fd | 4897 | |
190dce09 | 4898 | int |
0b1b3e42 | 4899 | arm_software_single_step (struct frame_info *frame) |
9512d7fd | 4900 | { |
a6d9a66e | 4901 | struct gdbarch *gdbarch = get_frame_arch (frame); |
6c95b8df | 4902 | struct address_space *aspace = get_frame_address_space (frame); |
0b1b3e42 | 4903 | CORE_ADDR next_pc = arm_get_next_pc (frame, get_frame_pc (frame)); |
18819fa6 UW |
4904 | |
4905 | arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc); | |
e6590a1b UW |
4906 | |
4907 | return 1; | |
9512d7fd | 4908 | } |
9512d7fd | 4909 | |
f9d67f43 DJ |
4910 | /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand |
4911 | the buffer to be NEW_LEN bytes ending at ENDADDR. Return | |
4912 | NULL if an error occurs. BUF is freed. */ | |
4913 | ||
4914 | static gdb_byte * | |
4915 | extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr, | |
4916 | int old_len, int new_len) | |
4917 | { | |
4918 | gdb_byte *new_buf, *middle; | |
4919 | int bytes_to_read = new_len - old_len; | |
4920 | ||
4921 | new_buf = xmalloc (new_len); | |
4922 | memcpy (new_buf + bytes_to_read, buf, old_len); | |
4923 | xfree (buf); | |
4924 | if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0) | |
4925 | { | |
4926 | xfree (new_buf); | |
4927 | return NULL; | |
4928 | } | |
4929 | return new_buf; | |
4930 | } | |
4931 | ||
4932 | /* An IT block is at most the 2-byte IT instruction followed by | |
4933 | four 4-byte instructions. The furthest back we must search to | |
4934 | find an IT block that affects the current instruction is thus | |
4935 | 2 + 3 * 4 == 14 bytes. */ | |
4936 | #define MAX_IT_BLOCK_PREFIX 14 | |
4937 | ||
4938 | /* Use a quick scan if there are more than this many bytes of | |
4939 | code. */ | |
4940 | #define IT_SCAN_THRESHOLD 32 | |
4941 | ||
4942 | /* Adjust a breakpoint's address to move breakpoints out of IT blocks. | |
4943 | A breakpoint in an IT block may not be hit, depending on the | |
4944 | condition flags. */ | |
4945 | static CORE_ADDR | |
4946 | arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr) | |
4947 | { | |
4948 | gdb_byte *buf; | |
4949 | char map_type; | |
4950 | CORE_ADDR boundary, func_start; | |
4951 | int buf_len, buf2_len; | |
4952 | enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch); | |
4953 | int i, any, last_it, last_it_count; | |
4954 | ||
4955 | /* If we are using BKPT breakpoints, none of this is necessary. */ | |
4956 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL) | |
4957 | return bpaddr; | |
4958 | ||
4959 | /* ARM mode does not have this problem. */ | |
9779414d | 4960 | if (!arm_pc_is_thumb (gdbarch, bpaddr)) |
f9d67f43 DJ |
4961 | return bpaddr; |
4962 | ||
4963 | /* We are setting a breakpoint in Thumb code that could potentially | |
4964 | contain an IT block. The first step is to find how much Thumb | |
4965 | code there is; we do not need to read outside of known Thumb | |
4966 | sequences. */ | |
4967 | map_type = arm_find_mapping_symbol (bpaddr, &boundary); | |
4968 | if (map_type == 0) | |
4969 | /* Thumb-2 code must have mapping symbols to have a chance. */ | |
4970 | return bpaddr; | |
4971 | ||
4972 | bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr); | |
4973 | ||
4974 | if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL) | |
4975 | && func_start > boundary) | |
4976 | boundary = func_start; | |
4977 | ||
4978 | /* Search for a candidate IT instruction. We have to do some fancy | |
4979 | footwork to distinguish a real IT instruction from the second | |
4980 | half of a 32-bit instruction, but there is no need for that if | |
4981 | there's no candidate. */ | |
4982 | buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX); | |
4983 | if (buf_len == 0) | |
4984 | /* No room for an IT instruction. */ | |
4985 | return bpaddr; | |
4986 | ||
4987 | buf = xmalloc (buf_len); | |
4988 | if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0) | |
4989 | return bpaddr; | |
4990 | any = 0; | |
4991 | for (i = 0; i < buf_len; i += 2) | |
4992 | { | |
4993 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
4994 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
4995 | { | |
4996 | any = 1; | |
4997 | break; | |
4998 | } | |
4999 | } | |
5000 | if (any == 0) | |
5001 | { | |
5002 | xfree (buf); | |
5003 | return bpaddr; | |
5004 | } | |
5005 | ||
5006 | /* OK, the code bytes before this instruction contain at least one | |
5007 | halfword which resembles an IT instruction. We know that it's | |
5008 | Thumb code, but there are still two possibilities. Either the | |
5009 | halfword really is an IT instruction, or it is the second half of | |
5010 | a 32-bit Thumb instruction. The only way we can tell is to | |
5011 | scan forwards from a known instruction boundary. */ | |
5012 | if (bpaddr - boundary > IT_SCAN_THRESHOLD) | |
5013 | { | |
5014 | int definite; | |
5015 | ||
5016 | /* There's a lot of code before this instruction. Start with an | |
5017 | optimistic search; it's easy to recognize halfwords that can | |
5018 | not be the start of a 32-bit instruction, and use that to | |
5019 | lock on to the instruction boundaries. */ | |
5020 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD); | |
5021 | if (buf == NULL) | |
5022 | return bpaddr; | |
5023 | buf_len = IT_SCAN_THRESHOLD; | |
5024 | ||
5025 | definite = 0; | |
5026 | for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2) | |
5027 | { | |
5028 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5029 | if (thumb_insn_size (inst1) == 2) | |
5030 | { | |
5031 | definite = 1; | |
5032 | break; | |
5033 | } | |
5034 | } | |
5035 | ||
5036 | /* At this point, if DEFINITE, BUF[I] is the first place we | |
5037 | are sure that we know the instruction boundaries, and it is far | |
5038 | enough from BPADDR that we could not miss an IT instruction | |
5039 | affecting BPADDR. If ! DEFINITE, give up - start from a | |
5040 | known boundary. */ | |
5041 | if (! definite) | |
5042 | { | |
0963b4bd MS |
5043 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, |
5044 | bpaddr - boundary); | |
f9d67f43 DJ |
5045 | if (buf == NULL) |
5046 | return bpaddr; | |
5047 | buf_len = bpaddr - boundary; | |
5048 | i = 0; | |
5049 | } | |
5050 | } | |
5051 | else | |
5052 | { | |
5053 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary); | |
5054 | if (buf == NULL) | |
5055 | return bpaddr; | |
5056 | buf_len = bpaddr - boundary; | |
5057 | i = 0; | |
5058 | } | |
5059 | ||
5060 | /* Scan forwards. Find the last IT instruction before BPADDR. */ | |
5061 | last_it = -1; | |
5062 | last_it_count = 0; | |
5063 | while (i < buf_len) | |
5064 | { | |
5065 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); | |
5066 | last_it_count--; | |
5067 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) | |
5068 | { | |
5069 | last_it = i; | |
5070 | if (inst1 & 0x0001) | |
5071 | last_it_count = 4; | |
5072 | else if (inst1 & 0x0002) | |
5073 | last_it_count = 3; | |
5074 | else if (inst1 & 0x0004) | |
5075 | last_it_count = 2; | |
5076 | else | |
5077 | last_it_count = 1; | |
5078 | } | |
5079 | i += thumb_insn_size (inst1); | |
5080 | } | |
5081 | ||
5082 | xfree (buf); | |
5083 | ||
5084 | if (last_it == -1) | |
5085 | /* There wasn't really an IT instruction after all. */ | |
5086 | return bpaddr; | |
5087 | ||
5088 | if (last_it_count < 1) | |
5089 | /* It was too far away. */ | |
5090 | return bpaddr; | |
5091 | ||
5092 | /* This really is a trouble spot. Move the breakpoint to the IT | |
5093 | instruction. */ | |
5094 | return bpaddr - buf_len + last_it; | |
5095 | } | |
5096 | ||
cca44b1b | 5097 | /* ARM displaced stepping support. |
c906108c | 5098 | |
cca44b1b | 5099 | Generally ARM displaced stepping works as follows: |
c906108c | 5100 | |
cca44b1b JB |
5101 | 1. When an instruction is to be single-stepped, it is first decoded by |
5102 | arm_process_displaced_insn (called from arm_displaced_step_copy_insn). | |
5103 | Depending on the type of instruction, it is then copied to a scratch | |
5104 | location, possibly in a modified form. The copy_* set of functions | |
0963b4bd | 5105 | performs such modification, as necessary. A breakpoint is placed after |
cca44b1b JB |
5106 | the modified instruction in the scratch space to return control to GDB. |
5107 | Note in particular that instructions which modify the PC will no longer | |
5108 | do so after modification. | |
c5aa993b | 5109 | |
cca44b1b JB |
5110 | 2. The instruction is single-stepped, by setting the PC to the scratch |
5111 | location address, and resuming. Control returns to GDB when the | |
5112 | breakpoint is hit. | |
c5aa993b | 5113 | |
cca44b1b JB |
5114 | 3. A cleanup function (cleanup_*) is called corresponding to the copy_* |
5115 | function used for the current instruction. This function's job is to | |
5116 | put the CPU/memory state back to what it would have been if the | |
5117 | instruction had been executed unmodified in its original location. */ | |
c5aa993b | 5118 | |
cca44b1b JB |
5119 | /* NOP instruction (mov r0, r0). */ |
5120 | #define ARM_NOP 0xe1a00000 | |
5121 | ||
5122 | /* Helper for register reads for displaced stepping. In particular, this | |
5123 | returns the PC as it would be seen by the instruction at its original | |
5124 | location. */ | |
5125 | ||
5126 | ULONGEST | |
36073a92 YQ |
5127 | displaced_read_reg (struct regcache *regs, struct displaced_step_closure *dsc, |
5128 | int regno) | |
cca44b1b JB |
5129 | { |
5130 | ULONGEST ret; | |
36073a92 | 5131 | CORE_ADDR from = dsc->insn_addr; |
cca44b1b | 5132 | |
bf9f652a | 5133 | if (regno == ARM_PC_REGNUM) |
cca44b1b | 5134 | { |
4db71c0b YQ |
5135 | /* Compute pipeline offset: |
5136 | - When executing an ARM instruction, PC reads as the address of the | |
5137 | current instruction plus 8. | |
5138 | - When executing a Thumb instruction, PC reads as the address of the | |
5139 | current instruction plus 4. */ | |
5140 | ||
36073a92 | 5141 | if (!dsc->is_thumb) |
4db71c0b YQ |
5142 | from += 8; |
5143 | else | |
5144 | from += 4; | |
5145 | ||
cca44b1b JB |
5146 | if (debug_displaced) |
5147 | fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n", | |
4db71c0b YQ |
5148 | (unsigned long) from); |
5149 | return (ULONGEST) from; | |
cca44b1b | 5150 | } |
c906108c | 5151 | else |
cca44b1b JB |
5152 | { |
5153 | regcache_cooked_read_unsigned (regs, regno, &ret); | |
5154 | if (debug_displaced) | |
5155 | fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n", | |
5156 | regno, (unsigned long) ret); | |
5157 | return ret; | |
5158 | } | |
c906108c SS |
5159 | } |
5160 | ||
cca44b1b JB |
5161 | static int |
5162 | displaced_in_arm_mode (struct regcache *regs) | |
5163 | { | |
5164 | ULONGEST ps; | |
9779414d | 5165 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
66e810cd | 5166 | |
cca44b1b | 5167 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
66e810cd | 5168 | |
9779414d | 5169 | return (ps & t_bit) == 0; |
cca44b1b | 5170 | } |
66e810cd | 5171 | |
cca44b1b | 5172 | /* Write to the PC as from a branch instruction. */ |
c906108c | 5173 | |
cca44b1b | 5174 | static void |
36073a92 YQ |
5175 | branch_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5176 | ULONGEST val) | |
c906108c | 5177 | { |
36073a92 | 5178 | if (!dsc->is_thumb) |
cca44b1b JB |
5179 | /* Note: If bits 0/1 are set, this branch would be unpredictable for |
5180 | architecture versions < 6. */ | |
0963b4bd MS |
5181 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5182 | val & ~(ULONGEST) 0x3); | |
cca44b1b | 5183 | else |
0963b4bd MS |
5184 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
5185 | val & ~(ULONGEST) 0x1); | |
cca44b1b | 5186 | } |
66e810cd | 5187 | |
cca44b1b JB |
5188 | /* Write to the PC as from a branch-exchange instruction. */ |
5189 | ||
5190 | static void | |
5191 | bx_write_pc (struct regcache *regs, ULONGEST val) | |
5192 | { | |
5193 | ULONGEST ps; | |
9779414d | 5194 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
cca44b1b JB |
5195 | |
5196 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); | |
5197 | ||
5198 | if ((val & 1) == 1) | |
c906108c | 5199 | { |
9779414d | 5200 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit); |
cca44b1b JB |
5201 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe); |
5202 | } | |
5203 | else if ((val & 2) == 0) | |
5204 | { | |
9779414d | 5205 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5206 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val); |
c906108c SS |
5207 | } |
5208 | else | |
5209 | { | |
cca44b1b JB |
5210 | /* Unpredictable behaviour. Try to do something sensible (switch to ARM |
5211 | mode, align dest to 4 bytes). */ | |
5212 | warning (_("Single-stepping BX to non-word-aligned ARM instruction.")); | |
9779414d | 5213 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
cca44b1b | 5214 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc); |
c906108c SS |
5215 | } |
5216 | } | |
ed9a39eb | 5217 | |
cca44b1b | 5218 | /* Write to the PC as if from a load instruction. */ |
ed9a39eb | 5219 | |
34e8f22d | 5220 | static void |
36073a92 YQ |
5221 | load_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5222 | ULONGEST val) | |
ed9a39eb | 5223 | { |
cca44b1b JB |
5224 | if (DISPLACED_STEPPING_ARCH_VERSION >= 5) |
5225 | bx_write_pc (regs, val); | |
5226 | else | |
36073a92 | 5227 | branch_write_pc (regs, dsc, val); |
cca44b1b | 5228 | } |
be8626e0 | 5229 | |
cca44b1b JB |
5230 | /* Write to the PC as if from an ALU instruction. */ |
5231 | ||
5232 | static void | |
36073a92 YQ |
5233 | alu_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
5234 | ULONGEST val) | |
cca44b1b | 5235 | { |
36073a92 | 5236 | if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb) |
cca44b1b JB |
5237 | bx_write_pc (regs, val); |
5238 | else | |
36073a92 | 5239 | branch_write_pc (regs, dsc, val); |
cca44b1b JB |
5240 | } |
5241 | ||
5242 | /* Helper for writing to registers for displaced stepping. Writing to the PC | |
5243 | has a varying effects depending on the instruction which does the write: | |
5244 | this is controlled by the WRITE_PC argument. */ | |
5245 | ||
5246 | void | |
5247 | displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc, | |
5248 | int regno, ULONGEST val, enum pc_write_style write_pc) | |
5249 | { | |
bf9f652a | 5250 | if (regno == ARM_PC_REGNUM) |
08216dd7 | 5251 | { |
cca44b1b JB |
5252 | if (debug_displaced) |
5253 | fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n", | |
5254 | (unsigned long) val); | |
5255 | switch (write_pc) | |
08216dd7 | 5256 | { |
cca44b1b | 5257 | case BRANCH_WRITE_PC: |
36073a92 | 5258 | branch_write_pc (regs, dsc, val); |
08216dd7 RE |
5259 | break; |
5260 | ||
cca44b1b JB |
5261 | case BX_WRITE_PC: |
5262 | bx_write_pc (regs, val); | |
5263 | break; | |
5264 | ||
5265 | case LOAD_WRITE_PC: | |
36073a92 | 5266 | load_write_pc (regs, dsc, val); |
cca44b1b JB |
5267 | break; |
5268 | ||
5269 | case ALU_WRITE_PC: | |
36073a92 | 5270 | alu_write_pc (regs, dsc, val); |
cca44b1b JB |
5271 | break; |
5272 | ||
5273 | case CANNOT_WRITE_PC: | |
5274 | warning (_("Instruction wrote to PC in an unexpected way when " | |
5275 | "single-stepping")); | |
08216dd7 RE |
5276 | break; |
5277 | ||
5278 | default: | |
97b9747c JB |
5279 | internal_error (__FILE__, __LINE__, |
5280 | _("Invalid argument to displaced_write_reg")); | |
08216dd7 | 5281 | } |
b508a996 | 5282 | |
cca44b1b | 5283 | dsc->wrote_to_pc = 1; |
b508a996 | 5284 | } |
ed9a39eb | 5285 | else |
b508a996 | 5286 | { |
cca44b1b JB |
5287 | if (debug_displaced) |
5288 | fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n", | |
5289 | regno, (unsigned long) val); | |
5290 | regcache_cooked_write_unsigned (regs, regno, val); | |
b508a996 | 5291 | } |
34e8f22d RE |
5292 | } |
5293 | ||
cca44b1b JB |
5294 | /* This function is used to concisely determine if an instruction INSN |
5295 | references PC. Register fields of interest in INSN should have the | |
0963b4bd MS |
5296 | corresponding fields of BITMASK set to 0b1111. The function |
5297 | returns return 1 if any of these fields in INSN reference the PC | |
5298 | (also 0b1111, r15), else it returns 0. */ | |
67255d04 RE |
5299 | |
5300 | static int | |
cca44b1b | 5301 | insn_references_pc (uint32_t insn, uint32_t bitmask) |
67255d04 | 5302 | { |
cca44b1b | 5303 | uint32_t lowbit = 1; |
67255d04 | 5304 | |
cca44b1b JB |
5305 | while (bitmask != 0) |
5306 | { | |
5307 | uint32_t mask; | |
44e1a9eb | 5308 | |
cca44b1b JB |
5309 | for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1) |
5310 | ; | |
67255d04 | 5311 | |
cca44b1b JB |
5312 | if (!lowbit) |
5313 | break; | |
67255d04 | 5314 | |
cca44b1b | 5315 | mask = lowbit * 0xf; |
67255d04 | 5316 | |
cca44b1b JB |
5317 | if ((insn & mask) == mask) |
5318 | return 1; | |
5319 | ||
5320 | bitmask &= ~mask; | |
67255d04 RE |
5321 | } |
5322 | ||
cca44b1b JB |
5323 | return 0; |
5324 | } | |
2af48f68 | 5325 | |
cca44b1b JB |
5326 | /* The simplest copy function. Many instructions have the same effect no |
5327 | matter what address they are executed at: in those cases, use this. */ | |
67255d04 | 5328 | |
cca44b1b | 5329 | static int |
6e39997a | 5330 | copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, |
cca44b1b JB |
5331 | const char *iname, struct displaced_step_closure *dsc) |
5332 | { | |
5333 | if (debug_displaced) | |
5334 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, " | |
5335 | "opcode/class '%s' unmodified\n", (unsigned long) insn, | |
5336 | iname); | |
67255d04 | 5337 | |
cca44b1b | 5338 | dsc->modinsn[0] = insn; |
67255d04 | 5339 | |
cca44b1b JB |
5340 | return 0; |
5341 | } | |
5342 | ||
5343 | /* Preload instructions with immediate offset. */ | |
5344 | ||
5345 | static void | |
6e39997a | 5346 | cleanup_preload (struct gdbarch *gdbarch, |
cca44b1b JB |
5347 | struct regcache *regs, struct displaced_step_closure *dsc) |
5348 | { | |
5349 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5350 | if (!dsc->u.preload.immed) | |
5351 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5352 | } | |
5353 | ||
5354 | static int | |
5355 | copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
5356 | struct displaced_step_closure *dsc) | |
5357 | { | |
5358 | unsigned int rn = bits (insn, 16, 19); | |
5359 | ULONGEST rn_val; | |
cca44b1b JB |
5360 | |
5361 | if (!insn_references_pc (insn, 0x000f0000ul)) | |
5362 | return copy_unmodified (gdbarch, insn, "preload", dsc); | |
5363 | ||
5364 | if (debug_displaced) | |
5365 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5366 | (unsigned long) insn); | |
5367 | ||
5368 | /* Preload instructions: | |
5369 | ||
5370 | {pli/pld} [rn, #+/-imm] | |
5371 | -> | |
5372 | {pli/pld} [r0, #+/-imm]. */ | |
5373 | ||
36073a92 YQ |
5374 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5375 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b JB |
5376 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5377 | ||
5378 | dsc->u.preload.immed = 1; | |
5379 | ||
5380 | dsc->modinsn[0] = insn & 0xfff0ffff; | |
5381 | ||
5382 | dsc->cleanup = &cleanup_preload; | |
5383 | ||
5384 | return 0; | |
5385 | } | |
5386 | ||
5387 | /* Preload instructions with register offset. */ | |
5388 | ||
5389 | static int | |
0963b4bd MS |
5390 | copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, |
5391 | struct regcache *regs, | |
cca44b1b JB |
5392 | struct displaced_step_closure *dsc) |
5393 | { | |
5394 | unsigned int rn = bits (insn, 16, 19); | |
5395 | unsigned int rm = bits (insn, 0, 3); | |
5396 | ULONGEST rn_val, rm_val; | |
cca44b1b JB |
5397 | |
5398 | if (!insn_references_pc (insn, 0x000f000ful)) | |
5399 | return copy_unmodified (gdbarch, insn, "preload reg", dsc); | |
5400 | ||
5401 | if (debug_displaced) | |
5402 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", | |
5403 | (unsigned long) insn); | |
5404 | ||
5405 | /* Preload register-offset instructions: | |
5406 | ||
5407 | {pli/pld} [rn, rm {, shift}] | |
5408 | -> | |
5409 | {pli/pld} [r0, r1 {, shift}]. */ | |
5410 | ||
36073a92 YQ |
5411 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5412 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5413 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5414 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
5415 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5416 | displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC); | |
5417 | ||
5418 | dsc->u.preload.immed = 0; | |
5419 | ||
5420 | dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1; | |
5421 | ||
5422 | dsc->cleanup = &cleanup_preload; | |
5423 | ||
5424 | return 0; | |
5425 | } | |
5426 | ||
5427 | /* Copy/cleanup coprocessor load and store instructions. */ | |
5428 | ||
5429 | static void | |
6e39997a | 5430 | cleanup_copro_load_store (struct gdbarch *gdbarch, |
cca44b1b JB |
5431 | struct regcache *regs, |
5432 | struct displaced_step_closure *dsc) | |
5433 | { | |
36073a92 | 5434 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5435 | |
5436 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5437 | ||
5438 | if (dsc->u.ldst.writeback) | |
5439 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC); | |
5440 | } | |
5441 | ||
5442 | static int | |
5443 | copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn, | |
5444 | struct regcache *regs, | |
5445 | struct displaced_step_closure *dsc) | |
5446 | { | |
5447 | unsigned int rn = bits (insn, 16, 19); | |
5448 | ULONGEST rn_val; | |
cca44b1b JB |
5449 | |
5450 | if (!insn_references_pc (insn, 0x000f0000ul)) | |
5451 | return copy_unmodified (gdbarch, insn, "copro load/store", dsc); | |
5452 | ||
5453 | if (debug_displaced) | |
5454 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " | |
5455 | "load/store insn %.8lx\n", (unsigned long) insn); | |
5456 | ||
5457 | /* Coprocessor load/store instructions: | |
5458 | ||
5459 | {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes) | |
5460 | -> | |
5461 | {stc/stc2} [r0, #+/-imm]. | |
5462 | ||
5463 | ldc/ldc2 are handled identically. */ | |
5464 | ||
36073a92 YQ |
5465 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5466 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b JB |
5467 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
5468 | ||
5469 | dsc->u.ldst.writeback = bit (insn, 25); | |
5470 | dsc->u.ldst.rn = rn; | |
5471 | ||
5472 | dsc->modinsn[0] = insn & 0xfff0ffff; | |
5473 | ||
5474 | dsc->cleanup = &cleanup_copro_load_store; | |
5475 | ||
5476 | return 0; | |
5477 | } | |
5478 | ||
5479 | /* Clean up branch instructions (actually perform the branch, by setting | |
5480 | PC). */ | |
5481 | ||
5482 | static void | |
6e39997a | 5483 | cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
5484 | struct displaced_step_closure *dsc) |
5485 | { | |
36073a92 | 5486 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
5487 | int branch_taken = condition_true (dsc->u.branch.cond, status); |
5488 | enum pc_write_style write_pc = dsc->u.branch.exchange | |
5489 | ? BX_WRITE_PC : BRANCH_WRITE_PC; | |
5490 | ||
5491 | if (!branch_taken) | |
5492 | return; | |
5493 | ||
5494 | if (dsc->u.branch.link) | |
5495 | { | |
36073a92 | 5496 | ULONGEST pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); |
bf9f652a | 5497 | displaced_write_reg (regs, dsc, ARM_LR_REGNUM, pc - 4, CANNOT_WRITE_PC); |
cca44b1b JB |
5498 | } |
5499 | ||
bf9f652a | 5500 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc); |
cca44b1b JB |
5501 | } |
5502 | ||
5503 | /* Copy B/BL/BLX instructions with immediate destinations. */ | |
5504 | ||
5505 | static int | |
6e39997a | 5506 | copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn, |
cca44b1b JB |
5507 | struct regcache *regs, struct displaced_step_closure *dsc) |
5508 | { | |
5509 | unsigned int cond = bits (insn, 28, 31); | |
5510 | int exchange = (cond == 0xf); | |
5511 | int link = exchange || bit (insn, 24); | |
5512 | CORE_ADDR from = dsc->insn_addr; | |
5513 | long offset; | |
5514 | ||
5515 | if (debug_displaced) | |
5516 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn " | |
5517 | "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b", | |
5518 | (unsigned long) insn); | |
5519 | ||
5520 | /* Implement "BL<cond> <label>" as: | |
5521 | ||
5522 | Preparation: cond <- instruction condition | |
5523 | Insn: mov r0, r0 (nop) | |
5524 | Cleanup: if (condition true) { r14 <- pc; pc <- label }. | |
5525 | ||
5526 | B<cond> similar, but don't set r14 in cleanup. */ | |
5527 | ||
5528 | if (exchange) | |
5529 | /* For BLX, set bit 0 of the destination. The cleanup_branch function will | |
5530 | then arrange the switch into Thumb mode. */ | |
5531 | offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1; | |
5532 | else | |
5533 | offset = bits (insn, 0, 23) << 2; | |
5534 | ||
5535 | if (bit (offset, 25)) | |
5536 | offset = offset | ~0x3ffffff; | |
5537 | ||
5538 | dsc->u.branch.cond = cond; | |
5539 | dsc->u.branch.link = link; | |
5540 | dsc->u.branch.exchange = exchange; | |
5541 | dsc->u.branch.dest = from + 8 + offset; | |
5542 | ||
5543 | dsc->modinsn[0] = ARM_NOP; | |
5544 | ||
5545 | dsc->cleanup = &cleanup_branch; | |
5546 | ||
5547 | return 0; | |
5548 | } | |
5549 | ||
5550 | /* Copy BX/BLX with register-specified destinations. */ | |
5551 | ||
5552 | static int | |
6e39997a | 5553 | copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn, |
cca44b1b JB |
5554 | struct regcache *regs, struct displaced_step_closure *dsc) |
5555 | { | |
5556 | unsigned int cond = bits (insn, 28, 31); | |
5557 | /* BX: x12xxx1x | |
5558 | BLX: x12xxx3x. */ | |
5559 | int link = bit (insn, 5); | |
5560 | unsigned int rm = bits (insn, 0, 3); | |
cca44b1b JB |
5561 | |
5562 | if (debug_displaced) | |
5563 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s register insn " | |
0963b4bd MS |
5564 | "%.8lx\n", (link) ? "blx" : "bx", |
5565 | (unsigned long) insn); | |
cca44b1b JB |
5566 | |
5567 | /* Implement {BX,BLX}<cond> <reg>" as: | |
5568 | ||
5569 | Preparation: cond <- instruction condition | |
5570 | Insn: mov r0, r0 (nop) | |
5571 | Cleanup: if (condition true) { r14 <- pc; pc <- dest; }. | |
5572 | ||
5573 | Don't set r14 in cleanup for BX. */ | |
5574 | ||
36073a92 | 5575 | dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
5576 | |
5577 | dsc->u.branch.cond = cond; | |
5578 | dsc->u.branch.link = link; | |
5579 | dsc->u.branch.exchange = 1; | |
5580 | ||
5581 | dsc->modinsn[0] = ARM_NOP; | |
5582 | ||
5583 | dsc->cleanup = &cleanup_branch; | |
5584 | ||
5585 | return 0; | |
5586 | } | |
5587 | ||
0963b4bd | 5588 | /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */ |
cca44b1b JB |
5589 | |
5590 | static void | |
6e39997a | 5591 | cleanup_alu_imm (struct gdbarch *gdbarch, |
cca44b1b JB |
5592 | struct regcache *regs, struct displaced_step_closure *dsc) |
5593 | { | |
36073a92 | 5594 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5595 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
5596 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5597 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
5598 | } | |
5599 | ||
5600 | static int | |
5601 | copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
5602 | struct displaced_step_closure *dsc) | |
5603 | { | |
5604 | unsigned int rn = bits (insn, 16, 19); | |
5605 | unsigned int rd = bits (insn, 12, 15); | |
5606 | unsigned int op = bits (insn, 21, 24); | |
5607 | int is_mov = (op == 0xd); | |
5608 | ULONGEST rd_val, rn_val; | |
cca44b1b JB |
5609 | |
5610 | if (!insn_references_pc (insn, 0x000ff000ul)) | |
5611 | return copy_unmodified (gdbarch, insn, "ALU immediate", dsc); | |
5612 | ||
5613 | if (debug_displaced) | |
5614 | fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn " | |
5615 | "%.8lx\n", is_mov ? "move" : "ALU", | |
5616 | (unsigned long) insn); | |
5617 | ||
5618 | /* Instruction is of form: | |
5619 | ||
5620 | <op><cond> rd, [rn,] #imm | |
5621 | ||
5622 | Rewrite as: | |
5623 | ||
5624 | Preparation: tmp1, tmp2 <- r0, r1; | |
5625 | r0, r1 <- rd, rn | |
5626 | Insn: <op><cond> r0, r1, #imm | |
5627 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 | |
5628 | */ | |
5629 | ||
36073a92 YQ |
5630 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5631 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5632 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5633 | rd_val = displaced_read_reg (regs, dsc, rd); | |
cca44b1b JB |
5634 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
5635 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5636 | dsc->rd = rd; | |
5637 | ||
5638 | if (is_mov) | |
5639 | dsc->modinsn[0] = insn & 0xfff00fff; | |
5640 | else | |
5641 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000; | |
5642 | ||
5643 | dsc->cleanup = &cleanup_alu_imm; | |
5644 | ||
5645 | return 0; | |
5646 | } | |
5647 | ||
5648 | /* Copy/cleanup arithmetic/logic insns with register RHS. */ | |
5649 | ||
5650 | static void | |
6e39997a | 5651 | cleanup_alu_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
5652 | struct regcache *regs, struct displaced_step_closure *dsc) |
5653 | { | |
5654 | ULONGEST rd_val; | |
5655 | int i; | |
5656 | ||
36073a92 | 5657 | rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5658 | |
5659 | for (i = 0; i < 3; i++) | |
5660 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
5661 | ||
5662 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
5663 | } | |
5664 | ||
5665 | static int | |
5666 | copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
5667 | struct displaced_step_closure *dsc) | |
5668 | { | |
5669 | unsigned int rn = bits (insn, 16, 19); | |
5670 | unsigned int rm = bits (insn, 0, 3); | |
5671 | unsigned int rd = bits (insn, 12, 15); | |
5672 | unsigned int op = bits (insn, 21, 24); | |
5673 | int is_mov = (op == 0xd); | |
5674 | ULONGEST rd_val, rn_val, rm_val; | |
cca44b1b JB |
5675 | |
5676 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
5677 | return copy_unmodified (gdbarch, insn, "ALU reg", dsc); | |
5678 | ||
5679 | if (debug_displaced) | |
5680 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n", | |
5681 | is_mov ? "move" : "ALU", (unsigned long) insn); | |
5682 | ||
5683 | /* Instruction is of form: | |
5684 | ||
5685 | <op><cond> rd, [rn,] rm [, <shift>] | |
5686 | ||
5687 | Rewrite as: | |
5688 | ||
5689 | Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2; | |
5690 | r0, r1, r2 <- rd, rn, rm | |
5691 | Insn: <op><cond> r0, r1, r2 [, <shift>] | |
5692 | Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3 | |
5693 | */ | |
5694 | ||
36073a92 YQ |
5695 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5696 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5697 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
5698 | rd_val = displaced_read_reg (regs, dsc, rd); | |
5699 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5700 | rm_val = displaced_read_reg (regs, dsc, rm); | |
cca44b1b JB |
5701 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
5702 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5703 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
5704 | dsc->rd = rd; | |
5705 | ||
5706 | if (is_mov) | |
5707 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2; | |
5708 | else | |
5709 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002; | |
5710 | ||
5711 | dsc->cleanup = &cleanup_alu_reg; | |
5712 | ||
5713 | return 0; | |
5714 | } | |
5715 | ||
5716 | /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */ | |
5717 | ||
5718 | static void | |
6e39997a | 5719 | cleanup_alu_shifted_reg (struct gdbarch *gdbarch, |
cca44b1b JB |
5720 | struct regcache *regs, |
5721 | struct displaced_step_closure *dsc) | |
5722 | { | |
36073a92 | 5723 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b JB |
5724 | int i; |
5725 | ||
5726 | for (i = 0; i < 4; i++) | |
5727 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); | |
5728 | ||
5729 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); | |
5730 | } | |
5731 | ||
5732 | static int | |
5733 | copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn, | |
0963b4bd MS |
5734 | struct regcache *regs, |
5735 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
5736 | { |
5737 | unsigned int rn = bits (insn, 16, 19); | |
5738 | unsigned int rm = bits (insn, 0, 3); | |
5739 | unsigned int rd = bits (insn, 12, 15); | |
5740 | unsigned int rs = bits (insn, 8, 11); | |
5741 | unsigned int op = bits (insn, 21, 24); | |
5742 | int is_mov = (op == 0xd), i; | |
5743 | ULONGEST rd_val, rn_val, rm_val, rs_val; | |
cca44b1b JB |
5744 | |
5745 | if (!insn_references_pc (insn, 0x000fff0ful)) | |
5746 | return copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc); | |
5747 | ||
5748 | if (debug_displaced) | |
5749 | fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn " | |
5750 | "%.8lx\n", is_mov ? "move" : "ALU", | |
5751 | (unsigned long) insn); | |
5752 | ||
5753 | /* Instruction is of form: | |
5754 | ||
5755 | <op><cond> rd, [rn,] rm, <shift> rs | |
5756 | ||
5757 | Rewrite as: | |
5758 | ||
5759 | Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3 | |
5760 | r0, r1, r2, r3 <- rd, rn, rm, rs | |
5761 | Insn: <op><cond> r0, r1, r2, <shift> r3 | |
5762 | Cleanup: tmp5 <- r0 | |
5763 | r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4 | |
5764 | rd <- tmp5 | |
5765 | */ | |
5766 | ||
5767 | for (i = 0; i < 4; i++) | |
36073a92 | 5768 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b | 5769 | |
36073a92 YQ |
5770 | rd_val = displaced_read_reg (regs, dsc, rd); |
5771 | rn_val = displaced_read_reg (regs, dsc, rn); | |
5772 | rm_val = displaced_read_reg (regs, dsc, rm); | |
5773 | rs_val = displaced_read_reg (regs, dsc, rs); | |
cca44b1b JB |
5774 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
5775 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); | |
5776 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); | |
5777 | displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC); | |
5778 | dsc->rd = rd; | |
5779 | ||
5780 | if (is_mov) | |
5781 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302; | |
5782 | else | |
5783 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302; | |
5784 | ||
5785 | dsc->cleanup = &cleanup_alu_shifted_reg; | |
5786 | ||
5787 | return 0; | |
5788 | } | |
5789 | ||
5790 | /* Clean up load instructions. */ | |
5791 | ||
5792 | static void | |
6e39997a | 5793 | cleanup_load (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
5794 | struct displaced_step_closure *dsc) |
5795 | { | |
5796 | ULONGEST rt_val, rt_val2 = 0, rn_val; | |
cca44b1b | 5797 | |
36073a92 | 5798 | rt_val = displaced_read_reg (regs, dsc, 0); |
cca44b1b | 5799 | if (dsc->u.ldst.xfersize == 8) |
36073a92 YQ |
5800 | rt_val2 = displaced_read_reg (regs, dsc, 1); |
5801 | rn_val = displaced_read_reg (regs, dsc, 2); | |
cca44b1b JB |
5802 | |
5803 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5804 | if (dsc->u.ldst.xfersize > 4) | |
5805 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5806 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
5807 | if (!dsc->u.ldst.immed) | |
5808 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
5809 | ||
5810 | /* Handle register writeback. */ | |
5811 | if (dsc->u.ldst.writeback) | |
5812 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
5813 | /* Put result in right place. */ | |
5814 | displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC); | |
5815 | if (dsc->u.ldst.xfersize == 8) | |
5816 | displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC); | |
5817 | } | |
5818 | ||
5819 | /* Clean up store instructions. */ | |
5820 | ||
5821 | static void | |
6e39997a | 5822 | cleanup_store (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
5823 | struct displaced_step_closure *dsc) |
5824 | { | |
36073a92 | 5825 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 2); |
cca44b1b JB |
5826 | |
5827 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); | |
5828 | if (dsc->u.ldst.xfersize > 4) | |
5829 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); | |
5830 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); | |
5831 | if (!dsc->u.ldst.immed) | |
5832 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); | |
5833 | if (!dsc->u.ldst.restore_r4) | |
5834 | displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC); | |
5835 | ||
5836 | /* Writeback. */ | |
5837 | if (dsc->u.ldst.writeback) | |
5838 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); | |
5839 | } | |
5840 | ||
5841 | /* Copy "extra" load/store instructions. These are halfword/doubleword | |
5842 | transfers, which have a different encoding to byte/word transfers. */ | |
5843 | ||
5844 | static int | |
5845 | copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged, | |
5846 | struct regcache *regs, struct displaced_step_closure *dsc) | |
5847 | { | |
5848 | unsigned int op1 = bits (insn, 20, 24); | |
5849 | unsigned int op2 = bits (insn, 5, 6); | |
5850 | unsigned int rt = bits (insn, 12, 15); | |
5851 | unsigned int rn = bits (insn, 16, 19); | |
5852 | unsigned int rm = bits (insn, 0, 3); | |
5853 | char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1}; | |
5854 | char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2}; | |
5855 | int immed = (op1 & 0x4) != 0; | |
5856 | int opcode; | |
5857 | ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0; | |
cca44b1b JB |
5858 | |
5859 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
5860 | return copy_unmodified (gdbarch, insn, "extra load/store", dsc); | |
5861 | ||
5862 | if (debug_displaced) | |
5863 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store " | |
5864 | "insn %.8lx\n", unpriveleged ? "unpriveleged " : "", | |
5865 | (unsigned long) insn); | |
5866 | ||
5867 | opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4; | |
5868 | ||
5869 | if (opcode < 0) | |
5870 | internal_error (__FILE__, __LINE__, | |
5871 | _("copy_extra_ld_st: instruction decode error")); | |
5872 | ||
36073a92 YQ |
5873 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5874 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); | |
5875 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 5876 | if (!immed) |
36073a92 | 5877 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 5878 | |
36073a92 | 5879 | rt_val = displaced_read_reg (regs, dsc, rt); |
cca44b1b | 5880 | if (bytesize[opcode] == 8) |
36073a92 YQ |
5881 | rt_val2 = displaced_read_reg (regs, dsc, rt + 1); |
5882 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5883 | if (!immed) |
36073a92 | 5884 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
5885 | |
5886 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
5887 | if (bytesize[opcode] == 8) | |
5888 | displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC); | |
5889 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
5890 | if (!immed) | |
5891 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
5892 | ||
5893 | dsc->rd = rt; | |
5894 | dsc->u.ldst.xfersize = bytesize[opcode]; | |
5895 | dsc->u.ldst.rn = rn; | |
5896 | dsc->u.ldst.immed = immed; | |
5897 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; | |
5898 | dsc->u.ldst.restore_r4 = 0; | |
5899 | ||
5900 | if (immed) | |
5901 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm] | |
5902 | -> | |
5903 | {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */ | |
5904 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
5905 | else | |
5906 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm] | |
5907 | -> | |
5908 | {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */ | |
5909 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
5910 | ||
5911 | dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store; | |
5912 | ||
5913 | return 0; | |
5914 | } | |
5915 | ||
5916 | /* Copy byte/word loads and stores. */ | |
5917 | ||
5918 | static int | |
5919 | copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn, | |
5920 | struct regcache *regs, | |
5921 | struct displaced_step_closure *dsc, int load, int byte, | |
5922 | int usermode) | |
5923 | { | |
5924 | int immed = !bit (insn, 25); | |
5925 | unsigned int rt = bits (insn, 12, 15); | |
5926 | unsigned int rn = bits (insn, 16, 19); | |
5927 | unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */ | |
5928 | ULONGEST rt_val, rn_val, rm_val = 0; | |
cca44b1b JB |
5929 | |
5930 | if (!insn_references_pc (insn, 0x000ff00ful)) | |
5931 | return copy_unmodified (gdbarch, insn, "load/store", dsc); | |
5932 | ||
5933 | if (debug_displaced) | |
5934 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s%s insn %.8lx\n", | |
5935 | load ? (byte ? "ldrb" : "ldr") | |
5936 | : (byte ? "strb" : "str"), usermode ? "t" : "", | |
5937 | (unsigned long) insn); | |
5938 | ||
36073a92 YQ |
5939 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
5940 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); | |
cca44b1b | 5941 | if (!immed) |
36073a92 | 5942 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
cca44b1b | 5943 | if (!load) |
36073a92 | 5944 | dsc->tmp[4] = displaced_read_reg (regs, dsc, 4); |
cca44b1b | 5945 | |
36073a92 YQ |
5946 | rt_val = displaced_read_reg (regs, dsc, rt); |
5947 | rn_val = displaced_read_reg (regs, dsc, rn); | |
cca44b1b | 5948 | if (!immed) |
36073a92 | 5949 | rm_val = displaced_read_reg (regs, dsc, rm); |
cca44b1b JB |
5950 | |
5951 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); | |
5952 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); | |
5953 | if (!immed) | |
5954 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); | |
5955 | ||
5956 | dsc->rd = rt; | |
5957 | dsc->u.ldst.xfersize = byte ? 1 : 4; | |
5958 | dsc->u.ldst.rn = rn; | |
5959 | dsc->u.ldst.immed = immed; | |
5960 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; | |
5961 | ||
5962 | /* To write PC we can do: | |
5963 | ||
494e194e YQ |
5964 | Before this sequence of instructions: |
5965 | r0 is the PC value got from displaced_read_reg, so r0 = from + 8; | |
5966 | r2 is the Rn value got from dispalced_read_reg. | |
5967 | ||
5968 | Insn1: push {pc} Write address of STR instruction + offset on stack | |
5969 | Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset | |
5970 | Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc | |
5971 | = addr(Insn1) + offset - addr(Insn3) - 8 | |
5972 | = offset - 16 | |
5973 | Insn4: add r4, r4, #8 r4 = offset - 8 | |
5974 | Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8 | |
5975 | = from + offset | |
5976 | Insn6: str r0, [r2, #imm] (or str r0, [r2, r3]) | |
cca44b1b JB |
5977 | |
5978 | Otherwise we don't know what value to write for PC, since the offset is | |
494e194e YQ |
5979 | architecture-dependent (sometimes PC+8, sometimes PC+12). More details |
5980 | of this can be found in Section "Saving from r15" in | |
5981 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */ | |
cca44b1b | 5982 | |
bf9f652a | 5983 | if (load || rt != ARM_PC_REGNUM) |
cca44b1b JB |
5984 | { |
5985 | dsc->u.ldst.restore_r4 = 0; | |
5986 | ||
5987 | if (immed) | |
5988 | /* {ldr,str}[b]<cond> rt, [rn, #imm], etc. | |
5989 | -> | |
5990 | {ldr,str}[b]<cond> r0, [r2, #imm]. */ | |
5991 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; | |
5992 | else | |
5993 | /* {ldr,str}[b]<cond> rt, [rn, rm], etc. | |
5994 | -> | |
5995 | {ldr,str}[b]<cond> r0, [r2, r3]. */ | |
5996 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; | |
5997 | } | |
5998 | else | |
5999 | { | |
6000 | /* We need to use r4 as scratch. Make sure it's restored afterwards. */ | |
6001 | dsc->u.ldst.restore_r4 = 1; | |
494e194e YQ |
6002 | dsc->modinsn[0] = 0xe92d8000; /* push {pc} */ |
6003 | dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */ | |
cca44b1b JB |
6004 | dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */ |
6005 | dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */ | |
6006 | dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */ | |
6007 | ||
6008 | /* As above. */ | |
6009 | if (immed) | |
6010 | dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000; | |
6011 | else | |
6012 | dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003; | |
6013 | ||
cca44b1b JB |
6014 | dsc->numinsns = 6; |
6015 | } | |
6016 | ||
6017 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; | |
6018 | ||
6019 | return 0; | |
6020 | } | |
6021 | ||
6022 | /* Cleanup LDM instructions with fully-populated register list. This is an | |
6023 | unfortunate corner case: it's impossible to implement correctly by modifying | |
6024 | the instruction. The issue is as follows: we have an instruction, | |
6025 | ||
6026 | ldm rN, {r0-r15} | |
6027 | ||
6028 | which we must rewrite to avoid loading PC. A possible solution would be to | |
6029 | do the load in two halves, something like (with suitable cleanup | |
6030 | afterwards): | |
6031 | ||
6032 | mov r8, rN | |
6033 | ldm[id][ab] r8!, {r0-r7} | |
6034 | str r7, <temp> | |
6035 | ldm[id][ab] r8, {r7-r14} | |
6036 | <bkpt> | |
6037 | ||
6038 | but at present there's no suitable place for <temp>, since the scratch space | |
6039 | is overwritten before the cleanup routine is called. For now, we simply | |
6040 | emulate the instruction. */ | |
6041 | ||
6042 | static void | |
6043 | cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs, | |
6044 | struct displaced_step_closure *dsc) | |
6045 | { | |
cca44b1b JB |
6046 | int inc = dsc->u.block.increment; |
6047 | int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0; | |
6048 | int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4); | |
6049 | uint32_t regmask = dsc->u.block.regmask; | |
6050 | int regno = inc ? 0 : 15; | |
6051 | CORE_ADDR xfer_addr = dsc->u.block.xfer_addr; | |
6052 | int exception_return = dsc->u.block.load && dsc->u.block.user | |
6053 | && (regmask & 0x8000) != 0; | |
36073a92 | 6054 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6055 | int do_transfer = condition_true (dsc->u.block.cond, status); |
6056 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6057 | ||
6058 | if (!do_transfer) | |
6059 | return; | |
6060 | ||
6061 | /* If the instruction is ldm rN, {...pc}^, I don't think there's anything | |
6062 | sensible we can do here. Complain loudly. */ | |
6063 | if (exception_return) | |
6064 | error (_("Cannot single-step exception return")); | |
6065 | ||
6066 | /* We don't handle any stores here for now. */ | |
6067 | gdb_assert (dsc->u.block.load != 0); | |
6068 | ||
6069 | if (debug_displaced) | |
6070 | fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: " | |
6071 | "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm", | |
6072 | dsc->u.block.increment ? "inc" : "dec", | |
6073 | dsc->u.block.before ? "before" : "after"); | |
6074 | ||
6075 | while (regmask) | |
6076 | { | |
6077 | uint32_t memword; | |
6078 | ||
6079 | if (inc) | |
bf9f652a | 6080 | while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0) |
cca44b1b JB |
6081 | regno++; |
6082 | else | |
6083 | while (regno >= 0 && (regmask & (1 << regno)) == 0) | |
6084 | regno--; | |
6085 | ||
6086 | xfer_addr += bump_before; | |
6087 | ||
6088 | memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order); | |
6089 | displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC); | |
6090 | ||
6091 | xfer_addr += bump_after; | |
6092 | ||
6093 | regmask &= ~(1 << regno); | |
6094 | } | |
6095 | ||
6096 | if (dsc->u.block.writeback) | |
6097 | displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr, | |
6098 | CANNOT_WRITE_PC); | |
6099 | } | |
6100 | ||
6101 | /* Clean up an STM which included the PC in the register list. */ | |
6102 | ||
6103 | static void | |
6104 | cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs, | |
6105 | struct displaced_step_closure *dsc) | |
6106 | { | |
36073a92 | 6107 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b JB |
6108 | int store_executed = condition_true (dsc->u.block.cond, status); |
6109 | CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask); | |
6110 | CORE_ADDR stm_insn_addr; | |
6111 | uint32_t pc_val; | |
6112 | long offset; | |
6113 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6114 | ||
6115 | /* If condition code fails, there's nothing else to do. */ | |
6116 | if (!store_executed) | |
6117 | return; | |
6118 | ||
6119 | if (dsc->u.block.increment) | |
6120 | { | |
6121 | pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs; | |
6122 | ||
6123 | if (dsc->u.block.before) | |
6124 | pc_stored_at += 4; | |
6125 | } | |
6126 | else | |
6127 | { | |
6128 | pc_stored_at = dsc->u.block.xfer_addr; | |
6129 | ||
6130 | if (dsc->u.block.before) | |
6131 | pc_stored_at -= 4; | |
6132 | } | |
6133 | ||
6134 | pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order); | |
6135 | stm_insn_addr = dsc->scratch_base; | |
6136 | offset = pc_val - stm_insn_addr; | |
6137 | ||
6138 | if (debug_displaced) | |
6139 | fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for " | |
6140 | "STM instruction\n", offset); | |
6141 | ||
6142 | /* Rewrite the stored PC to the proper value for the non-displaced original | |
6143 | instruction. */ | |
6144 | write_memory_unsigned_integer (pc_stored_at, 4, byte_order, | |
6145 | dsc->insn_addr + offset); | |
6146 | } | |
6147 | ||
6148 | /* Clean up an LDM which includes the PC in the register list. We clumped all | |
6149 | the registers in the transferred list into a contiguous range r0...rX (to | |
6150 | avoid loading PC directly and losing control of the debugged program), so we | |
6151 | must undo that here. */ | |
6152 | ||
6153 | static void | |
6e39997a | 6154 | cleanup_block_load_pc (struct gdbarch *gdbarch, |
cca44b1b JB |
6155 | struct regcache *regs, |
6156 | struct displaced_step_closure *dsc) | |
6157 | { | |
36073a92 | 6158 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
cca44b1b | 6159 | int load_executed = condition_true (dsc->u.block.cond, status), i; |
bf9f652a | 6160 | unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM; |
cca44b1b JB |
6161 | unsigned int regs_loaded = bitcount (mask); |
6162 | unsigned int num_to_shuffle = regs_loaded, clobbered; | |
6163 | ||
6164 | /* The method employed here will fail if the register list is fully populated | |
6165 | (we need to avoid loading PC directly). */ | |
6166 | gdb_assert (num_to_shuffle < 16); | |
6167 | ||
6168 | if (!load_executed) | |
6169 | return; | |
6170 | ||
6171 | clobbered = (1 << num_to_shuffle) - 1; | |
6172 | ||
6173 | while (num_to_shuffle > 0) | |
6174 | { | |
6175 | if ((mask & (1 << write_reg)) != 0) | |
6176 | { | |
6177 | unsigned int read_reg = num_to_shuffle - 1; | |
6178 | ||
6179 | if (read_reg != write_reg) | |
6180 | { | |
36073a92 | 6181 | ULONGEST rval = displaced_read_reg (regs, dsc, read_reg); |
cca44b1b JB |
6182 | displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC); |
6183 | if (debug_displaced) | |
6184 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move " | |
6185 | "loaded register r%d to r%d\n"), read_reg, | |
6186 | write_reg); | |
6187 | } | |
6188 | else if (debug_displaced) | |
6189 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register " | |
6190 | "r%d already in the right place\n"), | |
6191 | write_reg); | |
6192 | ||
6193 | clobbered &= ~(1 << write_reg); | |
6194 | ||
6195 | num_to_shuffle--; | |
6196 | } | |
6197 | ||
6198 | write_reg--; | |
6199 | } | |
6200 | ||
6201 | /* Restore any registers we scribbled over. */ | |
6202 | for (write_reg = 0; clobbered != 0; write_reg++) | |
6203 | { | |
6204 | if ((clobbered & (1 << write_reg)) != 0) | |
6205 | { | |
6206 | displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg], | |
6207 | CANNOT_WRITE_PC); | |
6208 | if (debug_displaced) | |
6209 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored " | |
6210 | "clobbered register r%d\n"), write_reg); | |
6211 | clobbered &= ~(1 << write_reg); | |
6212 | } | |
6213 | } | |
6214 | ||
6215 | /* Perform register writeback manually. */ | |
6216 | if (dsc->u.block.writeback) | |
6217 | { | |
6218 | ULONGEST new_rn_val = dsc->u.block.xfer_addr; | |
6219 | ||
6220 | if (dsc->u.block.increment) | |
6221 | new_rn_val += regs_loaded * 4; | |
6222 | else | |
6223 | new_rn_val -= regs_loaded * 4; | |
6224 | ||
6225 | displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val, | |
6226 | CANNOT_WRITE_PC); | |
6227 | } | |
6228 | } | |
6229 | ||
6230 | /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur | |
6231 | in user-level code (in particular exception return, ldm rn, {...pc}^). */ | |
6232 | ||
6233 | static int | |
6234 | copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
6235 | struct displaced_step_closure *dsc) | |
6236 | { | |
6237 | int load = bit (insn, 20); | |
6238 | int user = bit (insn, 22); | |
6239 | int increment = bit (insn, 23); | |
6240 | int before = bit (insn, 24); | |
6241 | int writeback = bit (insn, 21); | |
6242 | int rn = bits (insn, 16, 19); | |
cca44b1b | 6243 | |
0963b4bd MS |
6244 | /* Block transfers which don't mention PC can be run directly |
6245 | out-of-line. */ | |
bf9f652a | 6246 | if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0) |
cca44b1b JB |
6247 | return copy_unmodified (gdbarch, insn, "ldm/stm", dsc); |
6248 | ||
bf9f652a | 6249 | if (rn == ARM_PC_REGNUM) |
cca44b1b | 6250 | { |
0963b4bd MS |
6251 | warning (_("displaced: Unpredictable LDM or STM with " |
6252 | "base register r15")); | |
cca44b1b JB |
6253 | return copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc); |
6254 | } | |
6255 | ||
6256 | if (debug_displaced) | |
6257 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " | |
6258 | "%.8lx\n", (unsigned long) insn); | |
6259 | ||
36073a92 | 6260 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
cca44b1b JB |
6261 | dsc->u.block.rn = rn; |
6262 | ||
6263 | dsc->u.block.load = load; | |
6264 | dsc->u.block.user = user; | |
6265 | dsc->u.block.increment = increment; | |
6266 | dsc->u.block.before = before; | |
6267 | dsc->u.block.writeback = writeback; | |
6268 | dsc->u.block.cond = bits (insn, 28, 31); | |
6269 | ||
6270 | dsc->u.block.regmask = insn & 0xffff; | |
6271 | ||
6272 | if (load) | |
6273 | { | |
6274 | if ((insn & 0xffff) == 0xffff) | |
6275 | { | |
6276 | /* LDM with a fully-populated register list. This case is | |
6277 | particularly tricky. Implement for now by fully emulating the | |
6278 | instruction (which might not behave perfectly in all cases, but | |
6279 | these instructions should be rare enough for that not to matter | |
6280 | too much). */ | |
6281 | dsc->modinsn[0] = ARM_NOP; | |
6282 | ||
6283 | dsc->cleanup = &cleanup_block_load_all; | |
6284 | } | |
6285 | else | |
6286 | { | |
6287 | /* LDM of a list of registers which includes PC. Implement by | |
6288 | rewriting the list of registers to be transferred into a | |
6289 | contiguous chunk r0...rX before doing the transfer, then shuffling | |
6290 | registers into the correct places in the cleanup routine. */ | |
6291 | unsigned int regmask = insn & 0xffff; | |
6292 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; | |
6293 | unsigned int to = 0, from = 0, i, new_rn; | |
6294 | ||
6295 | for (i = 0; i < num_in_list; i++) | |
36073a92 | 6296 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
cca44b1b JB |
6297 | |
6298 | /* Writeback makes things complicated. We need to avoid clobbering | |
6299 | the base register with one of the registers in our modified | |
6300 | register list, but just using a different register can't work in | |
6301 | all cases, e.g.: | |
6302 | ||
6303 | ldm r14!, {r0-r13,pc} | |
6304 | ||
6305 | which would need to be rewritten as: | |
6306 | ||
6307 | ldm rN!, {r0-r14} | |
6308 | ||
6309 | but that can't work, because there's no free register for N. | |
6310 | ||
6311 | Solve this by turning off the writeback bit, and emulating | |
6312 | writeback manually in the cleanup routine. */ | |
6313 | ||
6314 | if (writeback) | |
6315 | insn &= ~(1 << 21); | |
6316 | ||
6317 | new_regmask = (1 << num_in_list) - 1; | |
6318 | ||
6319 | if (debug_displaced) | |
6320 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " | |
6321 | "{..., pc}: original reg list %.4x, modified " | |
6322 | "list %.4x\n"), rn, writeback ? "!" : "", | |
6323 | (int) insn & 0xffff, new_regmask); | |
6324 | ||
6325 | dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff); | |
6326 | ||
6327 | dsc->cleanup = &cleanup_block_load_pc; | |
6328 | } | |
6329 | } | |
6330 | else | |
6331 | { | |
6332 | /* STM of a list of registers which includes PC. Run the instruction | |
6333 | as-is, but out of line: this will store the wrong value for the PC, | |
6334 | so we must manually fix up the memory in the cleanup routine. | |
6335 | Doing things this way has the advantage that we can auto-detect | |
6336 | the offset of the PC write (which is architecture-dependent) in | |
6337 | the cleanup routine. */ | |
6338 | dsc->modinsn[0] = insn; | |
6339 | ||
6340 | dsc->cleanup = &cleanup_block_store_pc; | |
6341 | } | |
6342 | ||
6343 | return 0; | |
6344 | } | |
6345 | ||
6346 | /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden | |
6347 | for Linux, where some SVC instructions must be treated specially. */ | |
6348 | ||
6349 | static void | |
6e39997a | 6350 | cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs, |
cca44b1b JB |
6351 | struct displaced_step_closure *dsc) |
6352 | { | |
36073a92 | 6353 | CORE_ADDR resume_addr = dsc->insn_addr + 4; |
cca44b1b JB |
6354 | |
6355 | if (debug_displaced) | |
6356 | fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at " | |
6357 | "%.8lx\n", (unsigned long) resume_addr); | |
6358 | ||
6359 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC); | |
6360 | } | |
6361 | ||
6362 | static int | |
6363 | copy_svc (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to, | |
6364 | struct regcache *regs, struct displaced_step_closure *dsc) | |
6365 | { | |
cca44b1b JB |
6366 | /* Allow OS-specific code to override SVC handling. */ |
6367 | if (dsc->u.svc.copy_svc_os) | |
6368 | return dsc->u.svc.copy_svc_os (gdbarch, insn, to, regs, dsc); | |
6369 | ||
6370 | if (debug_displaced) | |
6371 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n", | |
6372 | (unsigned long) insn); | |
6373 | ||
6374 | /* Preparation: none. | |
6375 | Insn: unmodified svc. | |
6376 | Cleanup: pc <- insn_addr + 4. */ | |
6377 | ||
6378 | dsc->modinsn[0] = insn; | |
6379 | ||
6380 | dsc->cleanup = &cleanup_svc; | |
6381 | /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next | |
6382 | instruction. */ | |
6383 | dsc->wrote_to_pc = 1; | |
6384 | ||
6385 | return 0; | |
6386 | } | |
6387 | ||
6388 | /* Copy undefined instructions. */ | |
6389 | ||
6390 | static int | |
6e39997a | 6391 | copy_undef (struct gdbarch *gdbarch, uint32_t insn, |
cca44b1b JB |
6392 | struct displaced_step_closure *dsc) |
6393 | { | |
6394 | if (debug_displaced) | |
0963b4bd MS |
6395 | fprintf_unfiltered (gdb_stdlog, |
6396 | "displaced: copying undefined insn %.8lx\n", | |
cca44b1b JB |
6397 | (unsigned long) insn); |
6398 | ||
6399 | dsc->modinsn[0] = insn; | |
6400 | ||
6401 | return 0; | |
6402 | } | |
6403 | ||
6404 | /* Copy unpredictable instructions. */ | |
6405 | ||
6406 | static int | |
6e39997a | 6407 | copy_unpred (struct gdbarch *gdbarch, uint32_t insn, |
cca44b1b JB |
6408 | struct displaced_step_closure *dsc) |
6409 | { | |
6410 | if (debug_displaced) | |
6411 | fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn " | |
6412 | "%.8lx\n", (unsigned long) insn); | |
6413 | ||
6414 | dsc->modinsn[0] = insn; | |
6415 | ||
6416 | return 0; | |
6417 | } | |
6418 | ||
6419 | /* The decode_* functions are instruction decoding helpers. They mostly follow | |
6420 | the presentation in the ARM ARM. */ | |
6421 | ||
6422 | static int | |
6423 | decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn, | |
6424 | struct regcache *regs, | |
6425 | struct displaced_step_closure *dsc) | |
6426 | { | |
6427 | unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7); | |
6428 | unsigned int rn = bits (insn, 16, 19); | |
6429 | ||
6430 | if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0) | |
6431 | return copy_unmodified (gdbarch, insn, "cps", dsc); | |
6432 | else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1) | |
6433 | return copy_unmodified (gdbarch, insn, "setend", dsc); | |
6434 | else if ((op1 & 0x60) == 0x20) | |
6435 | return copy_unmodified (gdbarch, insn, "neon dataproc", dsc); | |
6436 | else if ((op1 & 0x71) == 0x40) | |
6437 | return copy_unmodified (gdbarch, insn, "neon elt/struct load/store", dsc); | |
6438 | else if ((op1 & 0x77) == 0x41) | |
6439 | return copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); | |
6440 | else if ((op1 & 0x77) == 0x45) | |
6441 | return copy_preload (gdbarch, insn, regs, dsc); /* pli. */ | |
6442 | else if ((op1 & 0x77) == 0x51) | |
6443 | { | |
6444 | if (rn != 0xf) | |
6445 | return copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ | |
6446 | else | |
6447 | return copy_unpred (gdbarch, insn, dsc); | |
6448 | } | |
6449 | else if ((op1 & 0x77) == 0x55) | |
6450 | return copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ | |
6451 | else if (op1 == 0x57) | |
6452 | switch (op2) | |
6453 | { | |
6454 | case 0x1: return copy_unmodified (gdbarch, insn, "clrex", dsc); | |
6455 | case 0x4: return copy_unmodified (gdbarch, insn, "dsb", dsc); | |
6456 | case 0x5: return copy_unmodified (gdbarch, insn, "dmb", dsc); | |
6457 | case 0x6: return copy_unmodified (gdbarch, insn, "isb", dsc); | |
6458 | default: return copy_unpred (gdbarch, insn, dsc); | |
6459 | } | |
6460 | else if ((op1 & 0x63) == 0x43) | |
6461 | return copy_unpred (gdbarch, insn, dsc); | |
6462 | else if ((op2 & 0x1) == 0x0) | |
6463 | switch (op1 & ~0x80) | |
6464 | { | |
6465 | case 0x61: | |
6466 | return copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); | |
6467 | case 0x65: | |
6468 | return copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */ | |
6469 | case 0x71: case 0x75: | |
6470 | /* pld/pldw reg. */ | |
6471 | return copy_preload_reg (gdbarch, insn, regs, dsc); | |
6472 | case 0x63: case 0x67: case 0x73: case 0x77: | |
6473 | return copy_unpred (gdbarch, insn, dsc); | |
6474 | default: | |
6475 | return copy_undef (gdbarch, insn, dsc); | |
6476 | } | |
6477 | else | |
6478 | return copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */ | |
6479 | } | |
6480 | ||
6481 | static int | |
6482 | decode_unconditional (struct gdbarch *gdbarch, uint32_t insn, | |
0963b4bd MS |
6483 | struct regcache *regs, |
6484 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
6485 | { |
6486 | if (bit (insn, 27) == 0) | |
6487 | return decode_misc_memhint_neon (gdbarch, insn, regs, dsc); | |
6488 | /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */ | |
6489 | else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20)) | |
6490 | { | |
6491 | case 0x0: case 0x2: | |
6492 | return copy_unmodified (gdbarch, insn, "srs", dsc); | |
6493 | ||
6494 | case 0x1: case 0x3: | |
6495 | return copy_unmodified (gdbarch, insn, "rfe", dsc); | |
6496 | ||
6497 | case 0x4: case 0x5: case 0x6: case 0x7: | |
6498 | return copy_b_bl_blx (gdbarch, insn, regs, dsc); | |
6499 | ||
6500 | case 0x8: | |
6501 | switch ((insn & 0xe00000) >> 21) | |
6502 | { | |
6503 | case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7: | |
6504 | /* stc/stc2. */ | |
6505 | return copy_copro_load_store (gdbarch, insn, regs, dsc); | |
6506 | ||
6507 | case 0x2: | |
6508 | return copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); | |
6509 | ||
6510 | default: | |
6511 | return copy_undef (gdbarch, insn, dsc); | |
6512 | } | |
6513 | ||
6514 | case 0x9: | |
6515 | { | |
6516 | int rn_f = (bits (insn, 16, 19) == 0xf); | |
6517 | switch ((insn & 0xe00000) >> 21) | |
6518 | { | |
6519 | case 0x1: case 0x3: | |
6520 | /* ldc/ldc2 imm (undefined for rn == pc). */ | |
6521 | return rn_f ? copy_undef (gdbarch, insn, dsc) | |
6522 | : copy_copro_load_store (gdbarch, insn, regs, dsc); | |
6523 | ||
6524 | case 0x2: | |
6525 | return copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); | |
6526 | ||
6527 | case 0x4: case 0x5: case 0x6: case 0x7: | |
6528 | /* ldc/ldc2 lit (undefined for rn != pc). */ | |
6529 | return rn_f ? copy_copro_load_store (gdbarch, insn, regs, dsc) | |
6530 | : copy_undef (gdbarch, insn, dsc); | |
6531 | ||
6532 | default: | |
6533 | return copy_undef (gdbarch, insn, dsc); | |
6534 | } | |
6535 | } | |
6536 | ||
6537 | case 0xa: | |
6538 | return copy_unmodified (gdbarch, insn, "stc/stc2", dsc); | |
6539 | ||
6540 | case 0xb: | |
6541 | if (bits (insn, 16, 19) == 0xf) | |
6542 | /* ldc/ldc2 lit. */ | |
6543 | return copy_copro_load_store (gdbarch, insn, regs, dsc); | |
6544 | else | |
6545 | return copy_undef (gdbarch, insn, dsc); | |
6546 | ||
6547 | case 0xc: | |
6548 | if (bit (insn, 4)) | |
6549 | return copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); | |
6550 | else | |
6551 | return copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); | |
6552 | ||
6553 | case 0xd: | |
6554 | if (bit (insn, 4)) | |
6555 | return copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); | |
6556 | else | |
6557 | return copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); | |
6558 | ||
6559 | default: | |
6560 | return copy_undef (gdbarch, insn, dsc); | |
6561 | } | |
6562 | } | |
6563 | ||
6564 | /* Decode miscellaneous instructions in dp/misc encoding space. */ | |
6565 | ||
6566 | static int | |
6567 | decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn, | |
0963b4bd MS |
6568 | struct regcache *regs, |
6569 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
6570 | { |
6571 | unsigned int op2 = bits (insn, 4, 6); | |
6572 | unsigned int op = bits (insn, 21, 22); | |
6573 | unsigned int op1 = bits (insn, 16, 19); | |
6574 | ||
6575 | switch (op2) | |
6576 | { | |
6577 | case 0x0: | |
6578 | return copy_unmodified (gdbarch, insn, "mrs/msr", dsc); | |
6579 | ||
6580 | case 0x1: | |
6581 | if (op == 0x1) /* bx. */ | |
6582 | return copy_bx_blx_reg (gdbarch, insn, regs, dsc); | |
6583 | else if (op == 0x3) | |
6584 | return copy_unmodified (gdbarch, insn, "clz", dsc); | |
6585 | else | |
6586 | return copy_undef (gdbarch, insn, dsc); | |
6587 | ||
6588 | case 0x2: | |
6589 | if (op == 0x1) | |
6590 | /* Not really supported. */ | |
6591 | return copy_unmodified (gdbarch, insn, "bxj", dsc); | |
6592 | else | |
6593 | return copy_undef (gdbarch, insn, dsc); | |
6594 | ||
6595 | case 0x3: | |
6596 | if (op == 0x1) | |
0963b4bd MS |
6597 | return copy_bx_blx_reg (gdbarch, insn, |
6598 | regs, dsc); /* blx register. */ | |
cca44b1b JB |
6599 | else |
6600 | return copy_undef (gdbarch, insn, dsc); | |
6601 | ||
6602 | case 0x5: | |
6603 | return copy_unmodified (gdbarch, insn, "saturating add/sub", dsc); | |
6604 | ||
6605 | case 0x7: | |
6606 | if (op == 0x1) | |
6607 | return copy_unmodified (gdbarch, insn, "bkpt", dsc); | |
6608 | else if (op == 0x3) | |
6609 | /* Not really supported. */ | |
6610 | return copy_unmodified (gdbarch, insn, "smc", dsc); | |
6611 | ||
6612 | default: | |
6613 | return copy_undef (gdbarch, insn, dsc); | |
6614 | } | |
6615 | } | |
6616 | ||
6617 | static int | |
6618 | decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, | |
6619 | struct displaced_step_closure *dsc) | |
6620 | { | |
6621 | if (bit (insn, 25)) | |
6622 | switch (bits (insn, 20, 24)) | |
6623 | { | |
6624 | case 0x10: | |
6625 | return copy_unmodified (gdbarch, insn, "movw", dsc); | |
6626 | ||
6627 | case 0x14: | |
6628 | return copy_unmodified (gdbarch, insn, "movt", dsc); | |
6629 | ||
6630 | case 0x12: case 0x16: | |
6631 | return copy_unmodified (gdbarch, insn, "msr imm", dsc); | |
6632 | ||
6633 | default: | |
6634 | return copy_alu_imm (gdbarch, insn, regs, dsc); | |
6635 | } | |
6636 | else | |
6637 | { | |
6638 | uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7); | |
6639 | ||
6640 | if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0) | |
6641 | return copy_alu_reg (gdbarch, insn, regs, dsc); | |
6642 | else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1) | |
6643 | return copy_alu_shifted_reg (gdbarch, insn, regs, dsc); | |
6644 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0) | |
6645 | return decode_miscellaneous (gdbarch, insn, regs, dsc); | |
6646 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8) | |
6647 | return copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc); | |
6648 | else if ((op1 & 0x10) == 0x00 && op2 == 0x9) | |
6649 | return copy_unmodified (gdbarch, insn, "mul/mla", dsc); | |
6650 | else if ((op1 & 0x10) == 0x10 && op2 == 0x9) | |
6651 | return copy_unmodified (gdbarch, insn, "synch", dsc); | |
6652 | else if (op2 == 0xb || (op2 & 0xd) == 0xd) | |
6653 | /* 2nd arg means "unpriveleged". */ | |
6654 | return copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs, | |
6655 | dsc); | |
6656 | } | |
6657 | ||
6658 | /* Should be unreachable. */ | |
6659 | return 1; | |
6660 | } | |
6661 | ||
6662 | static int | |
6663 | decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn, | |
6664 | struct regcache *regs, | |
6665 | struct displaced_step_closure *dsc) | |
6666 | { | |
6667 | int a = bit (insn, 25), b = bit (insn, 4); | |
6668 | uint32_t op1 = bits (insn, 20, 24); | |
6669 | int rn_f = bits (insn, 16, 19) == 0xf; | |
6670 | ||
6671 | if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02) | |
6672 | || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b)) | |
6673 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 0, 0); | |
6674 | else if ((!a && (op1 & 0x17) == 0x02) | |
6675 | || (a && (op1 & 0x17) == 0x02 && !b)) | |
6676 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 0, 1); | |
6677 | else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03) | |
6678 | || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b)) | |
6679 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 0, 0); | |
6680 | else if ((!a && (op1 & 0x17) == 0x03) | |
6681 | || (a && (op1 & 0x17) == 0x03 && !b)) | |
6682 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 0, 1); | |
6683 | else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06) | |
6684 | || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b)) | |
6685 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0); | |
6686 | else if ((!a && (op1 & 0x17) == 0x06) | |
6687 | || (a && (op1 & 0x17) == 0x06 && !b)) | |
6688 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1); | |
6689 | else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07) | |
6690 | || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b)) | |
6691 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0); | |
6692 | else if ((!a && (op1 & 0x17) == 0x07) | |
6693 | || (a && (op1 & 0x17) == 0x07 && !b)) | |
6694 | return copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1); | |
6695 | ||
6696 | /* Should be unreachable. */ | |
6697 | return 1; | |
6698 | } | |
6699 | ||
6700 | static int | |
6701 | decode_media (struct gdbarch *gdbarch, uint32_t insn, | |
6702 | struct displaced_step_closure *dsc) | |
6703 | { | |
6704 | switch (bits (insn, 20, 24)) | |
6705 | { | |
6706 | case 0x00: case 0x01: case 0x02: case 0x03: | |
6707 | return copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc); | |
6708 | ||
6709 | case 0x04: case 0x05: case 0x06: case 0x07: | |
6710 | return copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc); | |
6711 | ||
6712 | case 0x08: case 0x09: case 0x0a: case 0x0b: | |
6713 | case 0x0c: case 0x0d: case 0x0e: case 0x0f: | |
6714 | return copy_unmodified (gdbarch, insn, | |
6715 | "decode/pack/unpack/saturate/reverse", dsc); | |
6716 | ||
6717 | case 0x18: | |
6718 | if (bits (insn, 5, 7) == 0) /* op2. */ | |
6719 | { | |
6720 | if (bits (insn, 12, 15) == 0xf) | |
6721 | return copy_unmodified (gdbarch, insn, "usad8", dsc); | |
6722 | else | |
6723 | return copy_unmodified (gdbarch, insn, "usada8", dsc); | |
6724 | } | |
6725 | else | |
6726 | return copy_undef (gdbarch, insn, dsc); | |
6727 | ||
6728 | case 0x1a: case 0x1b: | |
6729 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
6730 | return copy_unmodified (gdbarch, insn, "sbfx", dsc); | |
6731 | else | |
6732 | return copy_undef (gdbarch, insn, dsc); | |
6733 | ||
6734 | case 0x1c: case 0x1d: | |
6735 | if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */ | |
6736 | { | |
6737 | if (bits (insn, 0, 3) == 0xf) | |
6738 | return copy_unmodified (gdbarch, insn, "bfc", dsc); | |
6739 | else | |
6740 | return copy_unmodified (gdbarch, insn, "bfi", dsc); | |
6741 | } | |
6742 | else | |
6743 | return copy_undef (gdbarch, insn, dsc); | |
6744 | ||
6745 | case 0x1e: case 0x1f: | |
6746 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ | |
6747 | return copy_unmodified (gdbarch, insn, "ubfx", dsc); | |
6748 | else | |
6749 | return copy_undef (gdbarch, insn, dsc); | |
6750 | } | |
6751 | ||
6752 | /* Should be unreachable. */ | |
6753 | return 1; | |
6754 | } | |
6755 | ||
6756 | static int | |
6757 | decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn, | |
6758 | struct regcache *regs, struct displaced_step_closure *dsc) | |
6759 | { | |
6760 | if (bit (insn, 25)) | |
6761 | return copy_b_bl_blx (gdbarch, insn, regs, dsc); | |
6762 | else | |
6763 | return copy_block_xfer (gdbarch, insn, regs, dsc); | |
6764 | } | |
6765 | ||
6766 | static int | |
6767 | decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn, | |
0963b4bd MS |
6768 | struct regcache *regs, |
6769 | struct displaced_step_closure *dsc) | |
cca44b1b JB |
6770 | { |
6771 | unsigned int opcode = bits (insn, 20, 24); | |
6772 | ||
6773 | switch (opcode) | |
6774 | { | |
6775 | case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */ | |
6776 | return copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc); | |
6777 | ||
6778 | case 0x08: case 0x0a: case 0x0c: case 0x0e: | |
6779 | case 0x12: case 0x16: | |
6780 | return copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc); | |
6781 | ||
6782 | case 0x09: case 0x0b: case 0x0d: case 0x0f: | |
6783 | case 0x13: case 0x17: | |
6784 | return copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc); | |
6785 | ||
6786 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ | |
6787 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ | |
6788 | /* Note: no writeback for these instructions. Bit 25 will always be | |
6789 | zero though (via caller), so the following works OK. */ | |
6790 | return copy_copro_load_store (gdbarch, insn, regs, dsc); | |
6791 | } | |
6792 | ||
6793 | /* Should be unreachable. */ | |
6794 | return 1; | |
6795 | } | |
6796 | ||
6797 | static int | |
6798 | decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to, | |
6799 | struct regcache *regs, struct displaced_step_closure *dsc) | |
6800 | { | |
6801 | unsigned int op1 = bits (insn, 20, 25); | |
6802 | int op = bit (insn, 4); | |
6803 | unsigned int coproc = bits (insn, 8, 11); | |
6804 | unsigned int rn = bits (insn, 16, 19); | |
6805 | ||
6806 | if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa) | |
6807 | return decode_ext_reg_ld_st (gdbarch, insn, regs, dsc); | |
6808 | else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00 | |
6809 | && (coproc & 0xe) != 0xa) | |
6810 | /* stc/stc2. */ | |
6811 | return copy_copro_load_store (gdbarch, insn, regs, dsc); | |
6812 | else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00 | |
6813 | && (coproc & 0xe) != 0xa) | |
6814 | /* ldc/ldc2 imm/lit. */ | |
6815 | return copy_copro_load_store (gdbarch, insn, regs, dsc); | |
6816 | else if ((op1 & 0x3e) == 0x00) | |
6817 | return copy_undef (gdbarch, insn, dsc); | |
6818 | else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa) | |
6819 | return copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc); | |
6820 | else if (op1 == 0x04 && (coproc & 0xe) != 0xa) | |
6821 | return copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); | |
6822 | else if (op1 == 0x05 && (coproc & 0xe) != 0xa) | |
6823 | return copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); | |
6824 | else if ((op1 & 0x30) == 0x20 && !op) | |
6825 | { | |
6826 | if ((coproc & 0xe) == 0xa) | |
6827 | return copy_unmodified (gdbarch, insn, "vfp dataproc", dsc); | |
6828 | else | |
6829 | return copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); | |
6830 | } | |
6831 | else if ((op1 & 0x30) == 0x20 && op) | |
6832 | return copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc); | |
6833 | else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa) | |
6834 | return copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); | |
6835 | else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa) | |
6836 | return copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); | |
6837 | else if ((op1 & 0x30) == 0x30) | |
6838 | return copy_svc (gdbarch, insn, to, regs, dsc); | |
6839 | else | |
6840 | return copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */ | |
6841 | } | |
6842 | ||
b434a28f YQ |
6843 | static void |
6844 | thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, | |
6845 | CORE_ADDR to, struct regcache *regs, | |
6846 | struct displaced_step_closure *dsc) | |
6847 | { | |
6848 | error (_("Displaced stepping is only supported in ARM mode")); | |
6849 | } | |
6850 | ||
cca44b1b | 6851 | void |
b434a28f YQ |
6852 | arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
6853 | CORE_ADDR to, struct regcache *regs, | |
cca44b1b JB |
6854 | struct displaced_step_closure *dsc) |
6855 | { | |
6856 | int err = 0; | |
b434a28f YQ |
6857 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
6858 | uint32_t insn; | |
cca44b1b JB |
6859 | |
6860 | /* Most displaced instructions use a 1-instruction scratch space, so set this | |
6861 | here and override below if/when necessary. */ | |
6862 | dsc->numinsns = 1; | |
6863 | dsc->insn_addr = from; | |
6864 | dsc->scratch_base = to; | |
6865 | dsc->cleanup = NULL; | |
6866 | dsc->wrote_to_pc = 0; | |
6867 | ||
b434a28f YQ |
6868 | if (!displaced_in_arm_mode (regs)) |
6869 | return thumb_process_displaced_insn (gdbarch, from, to, regs, dsc); | |
6870 | ||
4db71c0b YQ |
6871 | dsc->is_thumb = 0; |
6872 | dsc->insn_size = 4; | |
b434a28f YQ |
6873 | insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); |
6874 | if (debug_displaced) | |
6875 | fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx " | |
6876 | "at %.8lx\n", (unsigned long) insn, | |
6877 | (unsigned long) from); | |
6878 | ||
cca44b1b JB |
6879 | if ((insn & 0xf0000000) == 0xf0000000) |
6880 | err = decode_unconditional (gdbarch, insn, regs, dsc); | |
6881 | else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24)) | |
6882 | { | |
6883 | case 0x0: case 0x1: case 0x2: case 0x3: | |
6884 | err = decode_dp_misc (gdbarch, insn, regs, dsc); | |
6885 | break; | |
6886 | ||
6887 | case 0x4: case 0x5: case 0x6: | |
6888 | err = decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc); | |
6889 | break; | |
6890 | ||
6891 | case 0x7: | |
6892 | err = decode_media (gdbarch, insn, dsc); | |
6893 | break; | |
6894 | ||
6895 | case 0x8: case 0x9: case 0xa: case 0xb: | |
6896 | err = decode_b_bl_ldmstm (gdbarch, insn, regs, dsc); | |
6897 | break; | |
6898 | ||
6899 | case 0xc: case 0xd: case 0xe: case 0xf: | |
6900 | err = decode_svc_copro (gdbarch, insn, to, regs, dsc); | |
6901 | break; | |
6902 | } | |
6903 | ||
6904 | if (err) | |
6905 | internal_error (__FILE__, __LINE__, | |
6906 | _("arm_process_displaced_insn: Instruction decode error")); | |
6907 | } | |
6908 | ||
6909 | /* Actually set up the scratch space for a displaced instruction. */ | |
6910 | ||
6911 | void | |
6912 | arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from, | |
6913 | CORE_ADDR to, struct displaced_step_closure *dsc) | |
6914 | { | |
6915 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
4db71c0b | 6916 | unsigned int i, len, offset; |
cca44b1b | 6917 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
4db71c0b YQ |
6918 | int size = dsc->is_thumb? 2 : 4; |
6919 | const unsigned char *bkp_insn; | |
cca44b1b | 6920 | |
4db71c0b | 6921 | offset = 0; |
cca44b1b JB |
6922 | /* Poke modified instruction(s). */ |
6923 | for (i = 0; i < dsc->numinsns; i++) | |
6924 | { | |
6925 | if (debug_displaced) | |
4db71c0b YQ |
6926 | { |
6927 | fprintf_unfiltered (gdb_stdlog, "displaced: writing insn "); | |
6928 | if (size == 4) | |
6929 | fprintf_unfiltered (gdb_stdlog, "%.8lx", | |
6930 | dsc->modinsn[i]); | |
6931 | else if (size == 2) | |
6932 | fprintf_unfiltered (gdb_stdlog, "%.4x", | |
6933 | (unsigned short)dsc->modinsn[i]); | |
6934 | ||
6935 | fprintf_unfiltered (gdb_stdlog, " at %.8lx\n", | |
6936 | (unsigned long) to + offset); | |
6937 | ||
6938 | } | |
6939 | write_memory_unsigned_integer (to + offset, size, | |
6940 | byte_order_for_code, | |
cca44b1b | 6941 | dsc->modinsn[i]); |
4db71c0b YQ |
6942 | offset += size; |
6943 | } | |
6944 | ||
6945 | /* Choose the correct breakpoint instruction. */ | |
6946 | if (dsc->is_thumb) | |
6947 | { | |
6948 | bkp_insn = tdep->thumb_breakpoint; | |
6949 | len = tdep->thumb_breakpoint_size; | |
6950 | } | |
6951 | else | |
6952 | { | |
6953 | bkp_insn = tdep->arm_breakpoint; | |
6954 | len = tdep->arm_breakpoint_size; | |
cca44b1b JB |
6955 | } |
6956 | ||
6957 | /* Put breakpoint afterwards. */ | |
4db71c0b | 6958 | write_memory (to + offset, bkp_insn, len); |
cca44b1b JB |
6959 | |
6960 | if (debug_displaced) | |
6961 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", | |
6962 | paddress (gdbarch, from), paddress (gdbarch, to)); | |
6963 | } | |
6964 | ||
6965 | /* Entry point for copying an instruction into scratch space for displaced | |
6966 | stepping. */ | |
6967 | ||
6968 | struct displaced_step_closure * | |
6969 | arm_displaced_step_copy_insn (struct gdbarch *gdbarch, | |
6970 | CORE_ADDR from, CORE_ADDR to, | |
6971 | struct regcache *regs) | |
6972 | { | |
6973 | struct displaced_step_closure *dsc | |
6974 | = xmalloc (sizeof (struct displaced_step_closure)); | |
b434a28f | 6975 | arm_process_displaced_insn (gdbarch, from, to, regs, dsc); |
cca44b1b JB |
6976 | arm_displaced_init_closure (gdbarch, from, to, dsc); |
6977 | ||
6978 | return dsc; | |
6979 | } | |
6980 | ||
6981 | /* Entry point for cleaning things up after a displaced instruction has been | |
6982 | single-stepped. */ | |
6983 | ||
6984 | void | |
6985 | arm_displaced_step_fixup (struct gdbarch *gdbarch, | |
6986 | struct displaced_step_closure *dsc, | |
6987 | CORE_ADDR from, CORE_ADDR to, | |
6988 | struct regcache *regs) | |
6989 | { | |
6990 | if (dsc->cleanup) | |
6991 | dsc->cleanup (gdbarch, regs, dsc); | |
6992 | ||
6993 | if (!dsc->wrote_to_pc) | |
4db71c0b YQ |
6994 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
6995 | dsc->insn_addr + dsc->insn_size); | |
6996 | ||
cca44b1b JB |
6997 | } |
6998 | ||
6999 | #include "bfd-in2.h" | |
7000 | #include "libcoff.h" | |
7001 | ||
7002 | static int | |
7003 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) | |
7004 | { | |
9779414d DJ |
7005 | struct gdbarch *gdbarch = info->application_data; |
7006 | ||
7007 | if (arm_pc_is_thumb (gdbarch, memaddr)) | |
cca44b1b JB |
7008 | { |
7009 | static asymbol *asym; | |
7010 | static combined_entry_type ce; | |
7011 | static struct coff_symbol_struct csym; | |
7012 | static struct bfd fake_bfd; | |
7013 | static bfd_target fake_target; | |
7014 | ||
7015 | if (csym.native == NULL) | |
7016 | { | |
7017 | /* Create a fake symbol vector containing a Thumb symbol. | |
7018 | This is solely so that the code in print_insn_little_arm() | |
7019 | and print_insn_big_arm() in opcodes/arm-dis.c will detect | |
7020 | the presence of a Thumb symbol and switch to decoding | |
7021 | Thumb instructions. */ | |
7022 | ||
7023 | fake_target.flavour = bfd_target_coff_flavour; | |
7024 | fake_bfd.xvec = &fake_target; | |
7025 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; | |
7026 | csym.native = &ce; | |
7027 | csym.symbol.the_bfd = &fake_bfd; | |
7028 | csym.symbol.name = "fake"; | |
7029 | asym = (asymbol *) & csym; | |
7030 | } | |
7031 | ||
7032 | memaddr = UNMAKE_THUMB_ADDR (memaddr); | |
7033 | info->symbols = &asym; | |
7034 | } | |
7035 | else | |
7036 | info->symbols = NULL; | |
7037 | ||
7038 | if (info->endian == BFD_ENDIAN_BIG) | |
7039 | return print_insn_big_arm (memaddr, info); | |
7040 | else | |
7041 | return print_insn_little_arm (memaddr, info); | |
7042 | } | |
7043 | ||
7044 | /* The following define instruction sequences that will cause ARM | |
7045 | cpu's to take an undefined instruction trap. These are used to | |
7046 | signal a breakpoint to GDB. | |
7047 | ||
7048 | The newer ARMv4T cpu's are capable of operating in ARM or Thumb | |
7049 | modes. A different instruction is required for each mode. The ARM | |
7050 | cpu's can also be big or little endian. Thus four different | |
7051 | instructions are needed to support all cases. | |
7052 | ||
7053 | Note: ARMv4 defines several new instructions that will take the | |
7054 | undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does | |
7055 | not in fact add the new instructions. The new undefined | |
7056 | instructions in ARMv4 are all instructions that had no defined | |
7057 | behaviour in earlier chips. There is no guarantee that they will | |
7058 | raise an exception, but may be treated as NOP's. In practice, it | |
7059 | may only safe to rely on instructions matching: | |
7060 | ||
7061 | 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 | |
7062 | 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 | |
7063 | 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 | |
7064 | ||
0963b4bd | 7065 | Even this may only true if the condition predicate is true. The |
cca44b1b JB |
7066 | following use a condition predicate of ALWAYS so it is always TRUE. |
7067 | ||
7068 | There are other ways of forcing a breakpoint. GNU/Linux, RISC iX, | |
7069 | and NetBSD all use a software interrupt rather than an undefined | |
7070 | instruction to force a trap. This can be handled by by the | |
7071 | abi-specific code during establishment of the gdbarch vector. */ | |
7072 | ||
7073 | #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7} | |
7074 | #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE} | |
7075 | #define THUMB_LE_BREAKPOINT {0xbe,0xbe} | |
7076 | #define THUMB_BE_BREAKPOINT {0xbe,0xbe} | |
7077 | ||
7078 | static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT; | |
7079 | static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT; | |
7080 | static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT; | |
7081 | static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT; | |
7082 | ||
7083 | /* Determine the type and size of breakpoint to insert at PCPTR. Uses | |
7084 | the program counter value to determine whether a 16-bit or 32-bit | |
7085 | breakpoint should be used. It returns a pointer to a string of | |
7086 | bytes that encode a breakpoint instruction, stores the length of | |
7087 | the string to *lenptr, and adjusts the program counter (if | |
7088 | necessary) to point to the actual memory location where the | |
7089 | breakpoint should be inserted. */ | |
7090 | ||
7091 | static const unsigned char * | |
7092 | arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) | |
7093 | { | |
7094 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
177321bd | 7095 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
cca44b1b | 7096 | |
9779414d | 7097 | if (arm_pc_is_thumb (gdbarch, *pcptr)) |
cca44b1b JB |
7098 | { |
7099 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
177321bd DJ |
7100 | |
7101 | /* If we have a separate 32-bit breakpoint instruction for Thumb-2, | |
7102 | check whether we are replacing a 32-bit instruction. */ | |
7103 | if (tdep->thumb2_breakpoint != NULL) | |
7104 | { | |
7105 | gdb_byte buf[2]; | |
7106 | if (target_read_memory (*pcptr, buf, 2) == 0) | |
7107 | { | |
7108 | unsigned short inst1; | |
7109 | inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code); | |
7110 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) | |
7111 | { | |
7112 | *lenptr = tdep->thumb2_breakpoint_size; | |
7113 | return tdep->thumb2_breakpoint; | |
7114 | } | |
7115 | } | |
7116 | } | |
7117 | ||
cca44b1b JB |
7118 | *lenptr = tdep->thumb_breakpoint_size; |
7119 | return tdep->thumb_breakpoint; | |
7120 | } | |
7121 | else | |
7122 | { | |
7123 | *lenptr = tdep->arm_breakpoint_size; | |
7124 | return tdep->arm_breakpoint; | |
7125 | } | |
7126 | } | |
7127 | ||
177321bd DJ |
7128 | static void |
7129 | arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, | |
7130 | int *kindptr) | |
7131 | { | |
7132 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
7133 | ||
7134 | arm_breakpoint_from_pc (gdbarch, pcptr, kindptr); | |
7135 | ||
9779414d | 7136 | if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4) |
177321bd DJ |
7137 | /* The documented magic value for a 32-bit Thumb-2 breakpoint, so |
7138 | that this is not confused with a 32-bit ARM breakpoint. */ | |
7139 | *kindptr = 3; | |
7140 | } | |
7141 | ||
cca44b1b JB |
7142 | /* Extract from an array REGBUF containing the (raw) register state a |
7143 | function return value of type TYPE, and copy that, in virtual | |
7144 | format, into VALBUF. */ | |
7145 | ||
7146 | static void | |
7147 | arm_extract_return_value (struct type *type, struct regcache *regs, | |
7148 | gdb_byte *valbuf) | |
7149 | { | |
7150 | struct gdbarch *gdbarch = get_regcache_arch (regs); | |
7151 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7152 | ||
7153 | if (TYPE_CODE_FLT == TYPE_CODE (type)) | |
7154 | { | |
7155 | switch (gdbarch_tdep (gdbarch)->fp_model) | |
7156 | { | |
7157 | case ARM_FLOAT_FPA: | |
7158 | { | |
7159 | /* The value is in register F0 in internal format. We need to | |
7160 | extract the raw value and then convert it to the desired | |
7161 | internal type. */ | |
7162 | bfd_byte tmpbuf[FP_REGISTER_SIZE]; | |
7163 | ||
7164 | regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf); | |
7165 | convert_from_extended (floatformat_from_type (type), tmpbuf, | |
7166 | valbuf, gdbarch_byte_order (gdbarch)); | |
7167 | } | |
7168 | break; | |
7169 | ||
7170 | case ARM_FLOAT_SOFT_FPA: | |
7171 | case ARM_FLOAT_SOFT_VFP: | |
7172 | /* ARM_FLOAT_VFP can arise if this is a variadic function so | |
7173 | not using the VFP ABI code. */ | |
7174 | case ARM_FLOAT_VFP: | |
7175 | regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf); | |
7176 | if (TYPE_LENGTH (type) > 4) | |
7177 | regcache_cooked_read (regs, ARM_A1_REGNUM + 1, | |
7178 | valbuf + INT_REGISTER_SIZE); | |
7179 | break; | |
7180 | ||
7181 | default: | |
0963b4bd MS |
7182 | internal_error (__FILE__, __LINE__, |
7183 | _("arm_extract_return_value: " | |
7184 | "Floating point model not supported")); | |
cca44b1b JB |
7185 | break; |
7186 | } | |
7187 | } | |
7188 | else if (TYPE_CODE (type) == TYPE_CODE_INT | |
7189 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
7190 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
7191 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
7192 | || TYPE_CODE (type) == TYPE_CODE_REF | |
7193 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
7194 | { | |
b021a221 MS |
7195 | /* If the type is a plain integer, then the access is |
7196 | straight-forward. Otherwise we have to play around a bit | |
7197 | more. */ | |
cca44b1b JB |
7198 | int len = TYPE_LENGTH (type); |
7199 | int regno = ARM_A1_REGNUM; | |
7200 | ULONGEST tmp; | |
7201 | ||
7202 | while (len > 0) | |
7203 | { | |
7204 | /* By using store_unsigned_integer we avoid having to do | |
7205 | anything special for small big-endian values. */ | |
7206 | regcache_cooked_read_unsigned (regs, regno++, &tmp); | |
7207 | store_unsigned_integer (valbuf, | |
7208 | (len > INT_REGISTER_SIZE | |
7209 | ? INT_REGISTER_SIZE : len), | |
7210 | byte_order, tmp); | |
7211 | len -= INT_REGISTER_SIZE; | |
7212 | valbuf += INT_REGISTER_SIZE; | |
7213 | } | |
7214 | } | |
7215 | else | |
7216 | { | |
7217 | /* For a structure or union the behaviour is as if the value had | |
7218 | been stored to word-aligned memory and then loaded into | |
7219 | registers with 32-bit load instruction(s). */ | |
7220 | int len = TYPE_LENGTH (type); | |
7221 | int regno = ARM_A1_REGNUM; | |
7222 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; | |
7223 | ||
7224 | while (len > 0) | |
7225 | { | |
7226 | regcache_cooked_read (regs, regno++, tmpbuf); | |
7227 | memcpy (valbuf, tmpbuf, | |
7228 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); | |
7229 | len -= INT_REGISTER_SIZE; | |
7230 | valbuf += INT_REGISTER_SIZE; | |
7231 | } | |
7232 | } | |
7233 | } | |
7234 | ||
7235 | ||
7236 | /* Will a function return an aggregate type in memory or in a | |
7237 | register? Return 0 if an aggregate type can be returned in a | |
7238 | register, 1 if it must be returned in memory. */ | |
7239 | ||
7240 | static int | |
7241 | arm_return_in_memory (struct gdbarch *gdbarch, struct type *type) | |
7242 | { | |
7243 | int nRc; | |
7244 | enum type_code code; | |
7245 | ||
7246 | CHECK_TYPEDEF (type); | |
7247 | ||
7248 | /* In the ARM ABI, "integer" like aggregate types are returned in | |
7249 | registers. For an aggregate type to be integer like, its size | |
7250 | must be less than or equal to INT_REGISTER_SIZE and the | |
7251 | offset of each addressable subfield must be zero. Note that bit | |
7252 | fields are not addressable, and all addressable subfields of | |
7253 | unions always start at offset zero. | |
7254 | ||
7255 | This function is based on the behaviour of GCC 2.95.1. | |
7256 | See: gcc/arm.c: arm_return_in_memory() for details. | |
7257 | ||
7258 | Note: All versions of GCC before GCC 2.95.2 do not set up the | |
7259 | parameters correctly for a function returning the following | |
7260 | structure: struct { float f;}; This should be returned in memory, | |
7261 | not a register. Richard Earnshaw sent me a patch, but I do not | |
7262 | know of any way to detect if a function like the above has been | |
7263 | compiled with the correct calling convention. */ | |
7264 | ||
7265 | /* All aggregate types that won't fit in a register must be returned | |
7266 | in memory. */ | |
7267 | if (TYPE_LENGTH (type) > INT_REGISTER_SIZE) | |
7268 | { | |
7269 | return 1; | |
7270 | } | |
7271 | ||
7272 | /* The AAPCS says all aggregates not larger than a word are returned | |
7273 | in a register. */ | |
7274 | if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS) | |
7275 | return 0; | |
7276 | ||
7277 | /* The only aggregate types that can be returned in a register are | |
7278 | structs and unions. Arrays must be returned in memory. */ | |
7279 | code = TYPE_CODE (type); | |
7280 | if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code)) | |
7281 | { | |
7282 | return 1; | |
7283 | } | |
7284 | ||
7285 | /* Assume all other aggregate types can be returned in a register. | |
7286 | Run a check for structures, unions and arrays. */ | |
7287 | nRc = 0; | |
7288 | ||
7289 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) | |
7290 | { | |
7291 | int i; | |
7292 | /* Need to check if this struct/union is "integer" like. For | |
7293 | this to be true, its size must be less than or equal to | |
7294 | INT_REGISTER_SIZE and the offset of each addressable | |
7295 | subfield must be zero. Note that bit fields are not | |
7296 | addressable, and unions always start at offset zero. If any | |
7297 | of the subfields is a floating point type, the struct/union | |
7298 | cannot be an integer type. */ | |
7299 | ||
7300 | /* For each field in the object, check: | |
7301 | 1) Is it FP? --> yes, nRc = 1; | |
67255d04 RE |
7302 | 2) Is it addressable (bitpos != 0) and |
7303 | not packed (bitsize == 0)? | |
7304 | --> yes, nRc = 1 | |
7305 | */ | |
7306 | ||
7307 | for (i = 0; i < TYPE_NFIELDS (type); i++) | |
7308 | { | |
7309 | enum type_code field_type_code; | |
0963b4bd MS |
7310 | field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, |
7311 | i))); | |
67255d04 RE |
7312 | |
7313 | /* Is it a floating point type field? */ | |
7314 | if (field_type_code == TYPE_CODE_FLT) | |
7315 | { | |
7316 | nRc = 1; | |
7317 | break; | |
7318 | } | |
7319 | ||
7320 | /* If bitpos != 0, then we have to care about it. */ | |
7321 | if (TYPE_FIELD_BITPOS (type, i) != 0) | |
7322 | { | |
7323 | /* Bitfields are not addressable. If the field bitsize is | |
7324 | zero, then the field is not packed. Hence it cannot be | |
7325 | a bitfield or any other packed type. */ | |
7326 | if (TYPE_FIELD_BITSIZE (type, i) == 0) | |
7327 | { | |
7328 | nRc = 1; | |
7329 | break; | |
7330 | } | |
7331 | } | |
7332 | } | |
7333 | } | |
7334 | ||
7335 | return nRc; | |
7336 | } | |
7337 | ||
34e8f22d RE |
7338 | /* Write into appropriate registers a function return value of type |
7339 | TYPE, given in virtual format. */ | |
7340 | ||
7341 | static void | |
b508a996 | 7342 | arm_store_return_value (struct type *type, struct regcache *regs, |
5238cf52 | 7343 | const gdb_byte *valbuf) |
34e8f22d | 7344 | { |
be8626e0 | 7345 | struct gdbarch *gdbarch = get_regcache_arch (regs); |
e17a4113 | 7346 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
be8626e0 | 7347 | |
34e8f22d RE |
7348 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
7349 | { | |
7a5ea0d4 | 7350 | char buf[MAX_REGISTER_SIZE]; |
34e8f22d | 7351 | |
be8626e0 | 7352 | switch (gdbarch_tdep (gdbarch)->fp_model) |
08216dd7 RE |
7353 | { |
7354 | case ARM_FLOAT_FPA: | |
7355 | ||
be8626e0 MD |
7356 | convert_to_extended (floatformat_from_type (type), buf, valbuf, |
7357 | gdbarch_byte_order (gdbarch)); | |
b508a996 | 7358 | regcache_cooked_write (regs, ARM_F0_REGNUM, buf); |
08216dd7 RE |
7359 | break; |
7360 | ||
fd50bc42 | 7361 | case ARM_FLOAT_SOFT_FPA: |
08216dd7 | 7362 | case ARM_FLOAT_SOFT_VFP: |
90445bd3 DJ |
7363 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
7364 | not using the VFP ABI code. */ | |
7365 | case ARM_FLOAT_VFP: | |
b508a996 RE |
7366 | regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf); |
7367 | if (TYPE_LENGTH (type) > 4) | |
7368 | regcache_cooked_write (regs, ARM_A1_REGNUM + 1, | |
7a5ea0d4 | 7369 | valbuf + INT_REGISTER_SIZE); |
08216dd7 RE |
7370 | break; |
7371 | ||
7372 | default: | |
9b20d036 MS |
7373 | internal_error (__FILE__, __LINE__, |
7374 | _("arm_store_return_value: Floating " | |
7375 | "point model not supported")); | |
08216dd7 RE |
7376 | break; |
7377 | } | |
34e8f22d | 7378 | } |
b508a996 RE |
7379 | else if (TYPE_CODE (type) == TYPE_CODE_INT |
7380 | || TYPE_CODE (type) == TYPE_CODE_CHAR | |
7381 | || TYPE_CODE (type) == TYPE_CODE_BOOL | |
7382 | || TYPE_CODE (type) == TYPE_CODE_PTR | |
7383 | || TYPE_CODE (type) == TYPE_CODE_REF | |
7384 | || TYPE_CODE (type) == TYPE_CODE_ENUM) | |
7385 | { | |
7386 | if (TYPE_LENGTH (type) <= 4) | |
7387 | { | |
7388 | /* Values of one word or less are zero/sign-extended and | |
7389 | returned in r0. */ | |
7a5ea0d4 | 7390 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
7391 | LONGEST val = unpack_long (type, valbuf); |
7392 | ||
e17a4113 | 7393 | store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val); |
b508a996 RE |
7394 | regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf); |
7395 | } | |
7396 | else | |
7397 | { | |
7398 | /* Integral values greater than one word are stored in consecutive | |
7399 | registers starting with r0. This will always be a multiple of | |
7400 | the regiser size. */ | |
7401 | int len = TYPE_LENGTH (type); | |
7402 | int regno = ARM_A1_REGNUM; | |
7403 | ||
7404 | while (len > 0) | |
7405 | { | |
7406 | regcache_cooked_write (regs, regno++, valbuf); | |
7a5ea0d4 DJ |
7407 | len -= INT_REGISTER_SIZE; |
7408 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
7409 | } |
7410 | } | |
7411 | } | |
34e8f22d | 7412 | else |
b508a996 RE |
7413 | { |
7414 | /* For a structure or union the behaviour is as if the value had | |
7415 | been stored to word-aligned memory and then loaded into | |
7416 | registers with 32-bit load instruction(s). */ | |
7417 | int len = TYPE_LENGTH (type); | |
7418 | int regno = ARM_A1_REGNUM; | |
7a5ea0d4 | 7419 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
b508a996 RE |
7420 | |
7421 | while (len > 0) | |
7422 | { | |
7423 | memcpy (tmpbuf, valbuf, | |
7a5ea0d4 | 7424 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); |
b508a996 | 7425 | regcache_cooked_write (regs, regno++, tmpbuf); |
7a5ea0d4 DJ |
7426 | len -= INT_REGISTER_SIZE; |
7427 | valbuf += INT_REGISTER_SIZE; | |
b508a996 RE |
7428 | } |
7429 | } | |
34e8f22d RE |
7430 | } |
7431 | ||
2af48f68 PB |
7432 | |
7433 | /* Handle function return values. */ | |
7434 | ||
7435 | static enum return_value_convention | |
c055b101 CV |
7436 | arm_return_value (struct gdbarch *gdbarch, struct type *func_type, |
7437 | struct type *valtype, struct regcache *regcache, | |
7438 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
2af48f68 | 7439 | { |
7c00367c | 7440 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
90445bd3 DJ |
7441 | enum arm_vfp_cprc_base_type vfp_base_type; |
7442 | int vfp_base_count; | |
7443 | ||
7444 | if (arm_vfp_abi_for_function (gdbarch, func_type) | |
7445 | && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count)) | |
7446 | { | |
7447 | int reg_char = arm_vfp_cprc_reg_char (vfp_base_type); | |
7448 | int unit_length = arm_vfp_cprc_unit_length (vfp_base_type); | |
7449 | int i; | |
7450 | for (i = 0; i < vfp_base_count; i++) | |
7451 | { | |
58d6951d DJ |
7452 | if (reg_char == 'q') |
7453 | { | |
7454 | if (writebuf) | |
7455 | arm_neon_quad_write (gdbarch, regcache, i, | |
7456 | writebuf + i * unit_length); | |
7457 | ||
7458 | if (readbuf) | |
7459 | arm_neon_quad_read (gdbarch, regcache, i, | |
7460 | readbuf + i * unit_length); | |
7461 | } | |
7462 | else | |
7463 | { | |
7464 | char name_buf[4]; | |
7465 | int regnum; | |
7466 | ||
7467 | sprintf (name_buf, "%c%d", reg_char, i); | |
7468 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, | |
7469 | strlen (name_buf)); | |
7470 | if (writebuf) | |
7471 | regcache_cooked_write (regcache, regnum, | |
7472 | writebuf + i * unit_length); | |
7473 | if (readbuf) | |
7474 | regcache_cooked_read (regcache, regnum, | |
7475 | readbuf + i * unit_length); | |
7476 | } | |
90445bd3 DJ |
7477 | } |
7478 | return RETURN_VALUE_REGISTER_CONVENTION; | |
7479 | } | |
7c00367c | 7480 | |
2af48f68 PB |
7481 | if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
7482 | || TYPE_CODE (valtype) == TYPE_CODE_UNION | |
7483 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
7484 | { | |
7c00367c MK |
7485 | if (tdep->struct_return == pcc_struct_return |
7486 | || arm_return_in_memory (gdbarch, valtype)) | |
2af48f68 PB |
7487 | return RETURN_VALUE_STRUCT_CONVENTION; |
7488 | } | |
7489 | ||
7490 | if (writebuf) | |
7491 | arm_store_return_value (valtype, regcache, writebuf); | |
7492 | ||
7493 | if (readbuf) | |
7494 | arm_extract_return_value (valtype, regcache, readbuf); | |
7495 | ||
7496 | return RETURN_VALUE_REGISTER_CONVENTION; | |
7497 | } | |
7498 | ||
7499 | ||
9df628e0 | 7500 | static int |
60ade65d | 7501 | arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
9df628e0 | 7502 | { |
e17a4113 UW |
7503 | struct gdbarch *gdbarch = get_frame_arch (frame); |
7504 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
7505 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
9df628e0 | 7506 | CORE_ADDR jb_addr; |
7a5ea0d4 | 7507 | char buf[INT_REGISTER_SIZE]; |
9df628e0 | 7508 | |
60ade65d | 7509 | jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM); |
9df628e0 RE |
7510 | |
7511 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, | |
7a5ea0d4 | 7512 | INT_REGISTER_SIZE)) |
9df628e0 RE |
7513 | return 0; |
7514 | ||
e17a4113 | 7515 | *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order); |
9df628e0 RE |
7516 | return 1; |
7517 | } | |
7518 | ||
faa95490 DJ |
7519 | /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, |
7520 | return the target PC. Otherwise return 0. */ | |
c906108c SS |
7521 | |
7522 | CORE_ADDR | |
52f729a7 | 7523 | arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) |
c906108c | 7524 | { |
c5aa993b | 7525 | char *name; |
faa95490 | 7526 | int namelen; |
c906108c SS |
7527 | CORE_ADDR start_addr; |
7528 | ||
7529 | /* Find the starting address and name of the function containing the PC. */ | |
7530 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) | |
7531 | return 0; | |
7532 | ||
faa95490 DJ |
7533 | /* If PC is in a Thumb call or return stub, return the address of the |
7534 | target PC, which is in a register. The thunk functions are called | |
7535 | _call_via_xx, where x is the register name. The possible names | |
3d8d5e79 DJ |
7536 | are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar |
7537 | functions, named __ARM_call_via_r[0-7]. */ | |
7538 | if (strncmp (name, "_call_via_", 10) == 0 | |
7539 | || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0) | |
c906108c | 7540 | { |
ed9a39eb JM |
7541 | /* Use the name suffix to determine which register contains the |
7542 | target PC. */ | |
c5aa993b JM |
7543 | static char *table[15] = |
7544 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
7545 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" | |
7546 | }; | |
c906108c | 7547 | int regno; |
faa95490 | 7548 | int offset = strlen (name) - 2; |
c906108c SS |
7549 | |
7550 | for (regno = 0; regno <= 14; regno++) | |
faa95490 | 7551 | if (strcmp (&name[offset], table[regno]) == 0) |
52f729a7 | 7552 | return get_frame_register_unsigned (frame, regno); |
c906108c | 7553 | } |
ed9a39eb | 7554 | |
faa95490 DJ |
7555 | /* GNU ld generates __foo_from_arm or __foo_from_thumb for |
7556 | non-interworking calls to foo. We could decode the stubs | |
7557 | to find the target but it's easier to use the symbol table. */ | |
7558 | namelen = strlen (name); | |
7559 | if (name[0] == '_' && name[1] == '_' | |
7560 | && ((namelen > 2 + strlen ("_from_thumb") | |
7561 | && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb", | |
7562 | strlen ("_from_thumb")) == 0) | |
7563 | || (namelen > 2 + strlen ("_from_arm") | |
7564 | && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm", | |
7565 | strlen ("_from_arm")) == 0))) | |
7566 | { | |
7567 | char *target_name; | |
7568 | int target_len = namelen - 2; | |
7569 | struct minimal_symbol *minsym; | |
7570 | struct objfile *objfile; | |
7571 | struct obj_section *sec; | |
7572 | ||
7573 | if (name[namelen - 1] == 'b') | |
7574 | target_len -= strlen ("_from_thumb"); | |
7575 | else | |
7576 | target_len -= strlen ("_from_arm"); | |
7577 | ||
7578 | target_name = alloca (target_len + 1); | |
7579 | memcpy (target_name, name + 2, target_len); | |
7580 | target_name[target_len] = '\0'; | |
7581 | ||
7582 | sec = find_pc_section (pc); | |
7583 | objfile = (sec == NULL) ? NULL : sec->objfile; | |
7584 | minsym = lookup_minimal_symbol (target_name, NULL, objfile); | |
7585 | if (minsym != NULL) | |
7586 | return SYMBOL_VALUE_ADDRESS (minsym); | |
7587 | else | |
7588 | return 0; | |
7589 | } | |
7590 | ||
c5aa993b | 7591 | return 0; /* not a stub */ |
c906108c SS |
7592 | } |
7593 | ||
afd7eef0 RE |
7594 | static void |
7595 | set_arm_command (char *args, int from_tty) | |
7596 | { | |
edefbb7c AC |
7597 | printf_unfiltered (_("\ |
7598 | \"set arm\" must be followed by an apporpriate subcommand.\n")); | |
afd7eef0 RE |
7599 | help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout); |
7600 | } | |
7601 | ||
7602 | static void | |
7603 | show_arm_command (char *args, int from_tty) | |
7604 | { | |
26304000 | 7605 | cmd_show_list (showarmcmdlist, from_tty, ""); |
afd7eef0 RE |
7606 | } |
7607 | ||
28e97307 DJ |
7608 | static void |
7609 | arm_update_current_architecture (void) | |
fd50bc42 | 7610 | { |
28e97307 | 7611 | struct gdbarch_info info; |
fd50bc42 | 7612 | |
28e97307 | 7613 | /* If the current architecture is not ARM, we have nothing to do. */ |
1cf3db46 | 7614 | if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_arm) |
28e97307 | 7615 | return; |
fd50bc42 | 7616 | |
28e97307 DJ |
7617 | /* Update the architecture. */ |
7618 | gdbarch_info_init (&info); | |
fd50bc42 | 7619 | |
28e97307 | 7620 | if (!gdbarch_update_p (info)) |
9b20d036 | 7621 | internal_error (__FILE__, __LINE__, _("could not update architecture")); |
fd50bc42 RE |
7622 | } |
7623 | ||
7624 | static void | |
7625 | set_fp_model_sfunc (char *args, int from_tty, | |
7626 | struct cmd_list_element *c) | |
7627 | { | |
7628 | enum arm_float_model fp_model; | |
7629 | ||
7630 | for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++) | |
7631 | if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0) | |
7632 | { | |
7633 | arm_fp_model = fp_model; | |
7634 | break; | |
7635 | } | |
7636 | ||
7637 | if (fp_model == ARM_FLOAT_LAST) | |
edefbb7c | 7638 | internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."), |
fd50bc42 RE |
7639 | current_fp_model); |
7640 | ||
28e97307 | 7641 | arm_update_current_architecture (); |
fd50bc42 RE |
7642 | } |
7643 | ||
7644 | static void | |
08546159 AC |
7645 | show_fp_model (struct ui_file *file, int from_tty, |
7646 | struct cmd_list_element *c, const char *value) | |
fd50bc42 | 7647 | { |
1cf3db46 | 7648 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
fd50bc42 | 7649 | |
28e97307 | 7650 | if (arm_fp_model == ARM_FLOAT_AUTO |
1cf3db46 | 7651 | && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm) |
28e97307 DJ |
7652 | fprintf_filtered (file, _("\ |
7653 | The current ARM floating point model is \"auto\" (currently \"%s\").\n"), | |
7654 | fp_model_strings[tdep->fp_model]); | |
7655 | else | |
7656 | fprintf_filtered (file, _("\ | |
7657 | The current ARM floating point model is \"%s\".\n"), | |
7658 | fp_model_strings[arm_fp_model]); | |
7659 | } | |
7660 | ||
7661 | static void | |
7662 | arm_set_abi (char *args, int from_tty, | |
7663 | struct cmd_list_element *c) | |
7664 | { | |
7665 | enum arm_abi_kind arm_abi; | |
7666 | ||
7667 | for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++) | |
7668 | if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0) | |
7669 | { | |
7670 | arm_abi_global = arm_abi; | |
7671 | break; | |
7672 | } | |
7673 | ||
7674 | if (arm_abi == ARM_ABI_LAST) | |
7675 | internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."), | |
7676 | arm_abi_string); | |
7677 | ||
7678 | arm_update_current_architecture (); | |
7679 | } | |
7680 | ||
7681 | static void | |
7682 | arm_show_abi (struct ui_file *file, int from_tty, | |
7683 | struct cmd_list_element *c, const char *value) | |
7684 | { | |
1cf3db46 | 7685 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
28e97307 DJ |
7686 | |
7687 | if (arm_abi_global == ARM_ABI_AUTO | |
1cf3db46 | 7688 | && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm) |
28e97307 DJ |
7689 | fprintf_filtered (file, _("\ |
7690 | The current ARM ABI is \"auto\" (currently \"%s\").\n"), | |
7691 | arm_abi_strings[tdep->arm_abi]); | |
7692 | else | |
7693 | fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"), | |
7694 | arm_abi_string); | |
fd50bc42 RE |
7695 | } |
7696 | ||
0428b8f5 DJ |
7697 | static void |
7698 | arm_show_fallback_mode (struct ui_file *file, int from_tty, | |
7699 | struct cmd_list_element *c, const char *value) | |
7700 | { | |
1cf3db46 | 7701 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
0428b8f5 | 7702 | |
0963b4bd MS |
7703 | fprintf_filtered (file, |
7704 | _("The current execution mode assumed " | |
7705 | "(when symbols are unavailable) is \"%s\".\n"), | |
0428b8f5 DJ |
7706 | arm_fallback_mode_string); |
7707 | } | |
7708 | ||
7709 | static void | |
7710 | arm_show_force_mode (struct ui_file *file, int from_tty, | |
7711 | struct cmd_list_element *c, const char *value) | |
7712 | { | |
1cf3db46 | 7713 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
0428b8f5 | 7714 | |
0963b4bd MS |
7715 | fprintf_filtered (file, |
7716 | _("The current execution mode assumed " | |
7717 | "(even when symbols are available) is \"%s\".\n"), | |
0428b8f5 DJ |
7718 | arm_force_mode_string); |
7719 | } | |
7720 | ||
afd7eef0 RE |
7721 | /* If the user changes the register disassembly style used for info |
7722 | register and other commands, we have to also switch the style used | |
7723 | in opcodes for disassembly output. This function is run in the "set | |
7724 | arm disassembly" command, and does that. */ | |
bc90b915 FN |
7725 | |
7726 | static void | |
afd7eef0 | 7727 | set_disassembly_style_sfunc (char *args, int from_tty, |
bc90b915 FN |
7728 | struct cmd_list_element *c) |
7729 | { | |
afd7eef0 | 7730 | set_disassembly_style (); |
bc90b915 FN |
7731 | } |
7732 | \f | |
966fbf70 | 7733 | /* Return the ARM register name corresponding to register I. */ |
a208b0cb | 7734 | static const char * |
d93859e2 | 7735 | arm_register_name (struct gdbarch *gdbarch, int i) |
966fbf70 | 7736 | { |
58d6951d DJ |
7737 | const int num_regs = gdbarch_num_regs (gdbarch); |
7738 | ||
7739 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos | |
7740 | && i >= num_regs && i < num_regs + 32) | |
7741 | { | |
7742 | static const char *const vfp_pseudo_names[] = { | |
7743 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", | |
7744 | "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", | |
7745 | "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", | |
7746 | "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", | |
7747 | }; | |
7748 | ||
7749 | return vfp_pseudo_names[i - num_regs]; | |
7750 | } | |
7751 | ||
7752 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos | |
7753 | && i >= num_regs + 32 && i < num_regs + 32 + 16) | |
7754 | { | |
7755 | static const char *const neon_pseudo_names[] = { | |
7756 | "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", | |
7757 | "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15", | |
7758 | }; | |
7759 | ||
7760 | return neon_pseudo_names[i - num_regs - 32]; | |
7761 | } | |
7762 | ||
ff6f572f DJ |
7763 | if (i >= ARRAY_SIZE (arm_register_names)) |
7764 | /* These registers are only supported on targets which supply | |
7765 | an XML description. */ | |
7766 | return ""; | |
7767 | ||
966fbf70 RE |
7768 | return arm_register_names[i]; |
7769 | } | |
7770 | ||
bc90b915 | 7771 | static void |
afd7eef0 | 7772 | set_disassembly_style (void) |
bc90b915 | 7773 | { |
123dc839 | 7774 | int current; |
bc90b915 | 7775 | |
123dc839 DJ |
7776 | /* Find the style that the user wants. */ |
7777 | for (current = 0; current < num_disassembly_options; current++) | |
7778 | if (disassembly_style == valid_disassembly_styles[current]) | |
7779 | break; | |
7780 | gdb_assert (current < num_disassembly_options); | |
bc90b915 | 7781 | |
94c30b78 | 7782 | /* Synchronize the disassembler. */ |
bc90b915 FN |
7783 | set_arm_regname_option (current); |
7784 | } | |
7785 | ||
082fc60d RE |
7786 | /* Test whether the coff symbol specific value corresponds to a Thumb |
7787 | function. */ | |
7788 | ||
7789 | static int | |
7790 | coff_sym_is_thumb (int val) | |
7791 | { | |
f8bf5763 PM |
7792 | return (val == C_THUMBEXT |
7793 | || val == C_THUMBSTAT | |
7794 | || val == C_THUMBEXTFUNC | |
7795 | || val == C_THUMBSTATFUNC | |
7796 | || val == C_THUMBLABEL); | |
082fc60d RE |
7797 | } |
7798 | ||
7799 | /* arm_coff_make_msymbol_special() | |
7800 | arm_elf_make_msymbol_special() | |
7801 | ||
7802 | These functions test whether the COFF or ELF symbol corresponds to | |
7803 | an address in thumb code, and set a "special" bit in a minimal | |
7804 | symbol to indicate that it does. */ | |
7805 | ||
34e8f22d | 7806 | static void |
082fc60d RE |
7807 | arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym) |
7808 | { | |
467d42c4 UW |
7809 | if (ARM_SYM_BRANCH_TYPE (&((elf_symbol_type *)sym)->internal_elf_sym) |
7810 | == ST_BRANCH_TO_THUMB) | |
082fc60d RE |
7811 | MSYMBOL_SET_SPECIAL (msym); |
7812 | } | |
7813 | ||
34e8f22d | 7814 | static void |
082fc60d RE |
7815 | arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym) |
7816 | { | |
7817 | if (coff_sym_is_thumb (val)) | |
7818 | MSYMBOL_SET_SPECIAL (msym); | |
7819 | } | |
7820 | ||
60c5725c | 7821 | static void |
c1bd65d0 | 7822 | arm_objfile_data_free (struct objfile *objfile, void *arg) |
60c5725c DJ |
7823 | { |
7824 | struct arm_per_objfile *data = arg; | |
7825 | unsigned int i; | |
7826 | ||
7827 | for (i = 0; i < objfile->obfd->section_count; i++) | |
7828 | VEC_free (arm_mapping_symbol_s, data->section_maps[i]); | |
7829 | } | |
7830 | ||
7831 | static void | |
7832 | arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile, | |
7833 | asymbol *sym) | |
7834 | { | |
7835 | const char *name = bfd_asymbol_name (sym); | |
7836 | struct arm_per_objfile *data; | |
7837 | VEC(arm_mapping_symbol_s) **map_p; | |
7838 | struct arm_mapping_symbol new_map_sym; | |
7839 | ||
7840 | gdb_assert (name[0] == '$'); | |
7841 | if (name[1] != 'a' && name[1] != 't' && name[1] != 'd') | |
7842 | return; | |
7843 | ||
7844 | data = objfile_data (objfile, arm_objfile_data_key); | |
7845 | if (data == NULL) | |
7846 | { | |
7847 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, | |
7848 | struct arm_per_objfile); | |
7849 | set_objfile_data (objfile, arm_objfile_data_key, data); | |
7850 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, | |
7851 | objfile->obfd->section_count, | |
7852 | VEC(arm_mapping_symbol_s) *); | |
7853 | } | |
7854 | map_p = &data->section_maps[bfd_get_section (sym)->index]; | |
7855 | ||
7856 | new_map_sym.value = sym->value; | |
7857 | new_map_sym.type = name[1]; | |
7858 | ||
7859 | /* Assume that most mapping symbols appear in order of increasing | |
7860 | value. If they were randomly distributed, it would be faster to | |
7861 | always push here and then sort at first use. */ | |
7862 | if (!VEC_empty (arm_mapping_symbol_s, *map_p)) | |
7863 | { | |
7864 | struct arm_mapping_symbol *prev_map_sym; | |
7865 | ||
7866 | prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p); | |
7867 | if (prev_map_sym->value >= sym->value) | |
7868 | { | |
7869 | unsigned int idx; | |
7870 | idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym, | |
7871 | arm_compare_mapping_symbols); | |
7872 | VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym); | |
7873 | return; | |
7874 | } | |
7875 | } | |
7876 | ||
7877 | VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym); | |
7878 | } | |
7879 | ||
756fe439 | 7880 | static void |
61a1198a | 7881 | arm_write_pc (struct regcache *regcache, CORE_ADDR pc) |
756fe439 | 7882 | { |
9779414d | 7883 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
61a1198a | 7884 | regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc); |
756fe439 DJ |
7885 | |
7886 | /* If necessary, set the T bit. */ | |
7887 | if (arm_apcs_32) | |
7888 | { | |
9779414d | 7889 | ULONGEST val, t_bit; |
61a1198a | 7890 | regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val); |
9779414d DJ |
7891 | t_bit = arm_psr_thumb_bit (gdbarch); |
7892 | if (arm_pc_is_thumb (gdbarch, pc)) | |
7893 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, | |
7894 | val | t_bit); | |
756fe439 | 7895 | else |
61a1198a | 7896 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
9779414d | 7897 | val & ~t_bit); |
756fe439 DJ |
7898 | } |
7899 | } | |
123dc839 | 7900 | |
58d6951d DJ |
7901 | /* Read the contents of a NEON quad register, by reading from two |
7902 | double registers. This is used to implement the quad pseudo | |
7903 | registers, and for argument passing in case the quad registers are | |
7904 | missing; vectors are passed in quad registers when using the VFP | |
7905 | ABI, even if a NEON unit is not present. REGNUM is the index of | |
7906 | the quad register, in [0, 15]. */ | |
7907 | ||
05d1431c | 7908 | static enum register_status |
58d6951d DJ |
7909 | arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache, |
7910 | int regnum, gdb_byte *buf) | |
7911 | { | |
7912 | char name_buf[4]; | |
7913 | gdb_byte reg_buf[8]; | |
7914 | int offset, double_regnum; | |
05d1431c | 7915 | enum register_status status; |
58d6951d DJ |
7916 | |
7917 | sprintf (name_buf, "d%d", regnum << 1); | |
7918 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, | |
7919 | strlen (name_buf)); | |
7920 | ||
7921 | /* d0 is always the least significant half of q0. */ | |
7922 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
7923 | offset = 8; | |
7924 | else | |
7925 | offset = 0; | |
7926 | ||
05d1431c PA |
7927 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
7928 | if (status != REG_VALID) | |
7929 | return status; | |
58d6951d DJ |
7930 | memcpy (buf + offset, reg_buf, 8); |
7931 | ||
7932 | offset = 8 - offset; | |
05d1431c PA |
7933 | status = regcache_raw_read (regcache, double_regnum + 1, reg_buf); |
7934 | if (status != REG_VALID) | |
7935 | return status; | |
58d6951d | 7936 | memcpy (buf + offset, reg_buf, 8); |
05d1431c PA |
7937 | |
7938 | return REG_VALID; | |
58d6951d DJ |
7939 | } |
7940 | ||
05d1431c | 7941 | static enum register_status |
58d6951d DJ |
7942 | arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache, |
7943 | int regnum, gdb_byte *buf) | |
7944 | { | |
7945 | const int num_regs = gdbarch_num_regs (gdbarch); | |
7946 | char name_buf[4]; | |
7947 | gdb_byte reg_buf[8]; | |
7948 | int offset, double_regnum; | |
7949 | ||
7950 | gdb_assert (regnum >= num_regs); | |
7951 | regnum -= num_regs; | |
7952 | ||
7953 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
7954 | /* Quad-precision register. */ | |
05d1431c | 7955 | return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf); |
58d6951d DJ |
7956 | else |
7957 | { | |
05d1431c PA |
7958 | enum register_status status; |
7959 | ||
58d6951d DJ |
7960 | /* Single-precision register. */ |
7961 | gdb_assert (regnum < 32); | |
7962 | ||
7963 | /* s0 is always the least significant half of d0. */ | |
7964 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
7965 | offset = (regnum & 1) ? 0 : 4; | |
7966 | else | |
7967 | offset = (regnum & 1) ? 4 : 0; | |
7968 | ||
7969 | sprintf (name_buf, "d%d", regnum >> 1); | |
7970 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, | |
7971 | strlen (name_buf)); | |
7972 | ||
05d1431c PA |
7973 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
7974 | if (status == REG_VALID) | |
7975 | memcpy (buf, reg_buf + offset, 4); | |
7976 | return status; | |
58d6951d DJ |
7977 | } |
7978 | } | |
7979 | ||
7980 | /* Store the contents of BUF to a NEON quad register, by writing to | |
7981 | two double registers. This is used to implement the quad pseudo | |
7982 | registers, and for argument passing in case the quad registers are | |
7983 | missing; vectors are passed in quad registers when using the VFP | |
7984 | ABI, even if a NEON unit is not present. REGNUM is the index | |
7985 | of the quad register, in [0, 15]. */ | |
7986 | ||
7987 | static void | |
7988 | arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
7989 | int regnum, const gdb_byte *buf) | |
7990 | { | |
7991 | char name_buf[4]; | |
7992 | gdb_byte reg_buf[8]; | |
7993 | int offset, double_regnum; | |
7994 | ||
7995 | sprintf (name_buf, "d%d", regnum << 1); | |
7996 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, | |
7997 | strlen (name_buf)); | |
7998 | ||
7999 | /* d0 is always the least significant half of q0. */ | |
8000 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
8001 | offset = 8; | |
8002 | else | |
8003 | offset = 0; | |
8004 | ||
8005 | regcache_raw_write (regcache, double_regnum, buf + offset); | |
8006 | offset = 8 - offset; | |
8007 | regcache_raw_write (regcache, double_regnum + 1, buf + offset); | |
8008 | } | |
8009 | ||
8010 | static void | |
8011 | arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, | |
8012 | int regnum, const gdb_byte *buf) | |
8013 | { | |
8014 | const int num_regs = gdbarch_num_regs (gdbarch); | |
8015 | char name_buf[4]; | |
8016 | gdb_byte reg_buf[8]; | |
8017 | int offset, double_regnum; | |
8018 | ||
8019 | gdb_assert (regnum >= num_regs); | |
8020 | regnum -= num_regs; | |
8021 | ||
8022 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) | |
8023 | /* Quad-precision register. */ | |
8024 | arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf); | |
8025 | else | |
8026 | { | |
8027 | /* Single-precision register. */ | |
8028 | gdb_assert (regnum < 32); | |
8029 | ||
8030 | /* s0 is always the least significant half of d0. */ | |
8031 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) | |
8032 | offset = (regnum & 1) ? 0 : 4; | |
8033 | else | |
8034 | offset = (regnum & 1) ? 4 : 0; | |
8035 | ||
8036 | sprintf (name_buf, "d%d", regnum >> 1); | |
8037 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, | |
8038 | strlen (name_buf)); | |
8039 | ||
8040 | regcache_raw_read (regcache, double_regnum, reg_buf); | |
8041 | memcpy (reg_buf + offset, buf, 4); | |
8042 | regcache_raw_write (regcache, double_regnum, reg_buf); | |
8043 | } | |
8044 | } | |
8045 | ||
123dc839 DJ |
8046 | static struct value * |
8047 | value_of_arm_user_reg (struct frame_info *frame, const void *baton) | |
8048 | { | |
8049 | const int *reg_p = baton; | |
8050 | return value_of_register (*reg_p, frame); | |
8051 | } | |
97e03143 | 8052 | \f |
70f80edf JT |
8053 | static enum gdb_osabi |
8054 | arm_elf_osabi_sniffer (bfd *abfd) | |
97e03143 | 8055 | { |
2af48f68 | 8056 | unsigned int elfosabi; |
70f80edf | 8057 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
97e03143 | 8058 | |
70f80edf | 8059 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
97e03143 | 8060 | |
28e97307 DJ |
8061 | if (elfosabi == ELFOSABI_ARM) |
8062 | /* GNU tools use this value. Check note sections in this case, | |
8063 | as well. */ | |
8064 | bfd_map_over_sections (abfd, | |
8065 | generic_elf_osabi_sniff_abi_tag_sections, | |
8066 | &osabi); | |
97e03143 | 8067 | |
28e97307 | 8068 | /* Anything else will be handled by the generic ELF sniffer. */ |
70f80edf | 8069 | return osabi; |
97e03143 RE |
8070 | } |
8071 | ||
54483882 YQ |
8072 | static int |
8073 | arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum, | |
8074 | struct reggroup *group) | |
8075 | { | |
2c291032 YQ |
8076 | /* FPS register's type is INT, but belongs to float_reggroup. Beside |
8077 | this, FPS register belongs to save_regroup, restore_reggroup, and | |
8078 | all_reggroup, of course. */ | |
54483882 | 8079 | if (regnum == ARM_FPS_REGNUM) |
2c291032 YQ |
8080 | return (group == float_reggroup |
8081 | || group == save_reggroup | |
8082 | || group == restore_reggroup | |
8083 | || group == all_reggroup); | |
54483882 YQ |
8084 | else |
8085 | return default_register_reggroup_p (gdbarch, regnum, group); | |
8086 | } | |
8087 | ||
70f80edf | 8088 | \f |
da3c6d4a MS |
8089 | /* Initialize the current architecture based on INFO. If possible, |
8090 | re-use an architecture from ARCHES, which is a list of | |
8091 | architectures already created during this debugging session. | |
97e03143 | 8092 | |
da3c6d4a MS |
8093 | Called e.g. at program startup, when reading a core file, and when |
8094 | reading a binary file. */ | |
97e03143 | 8095 | |
39bbf761 RE |
8096 | static struct gdbarch * |
8097 | arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
8098 | { | |
97e03143 | 8099 | struct gdbarch_tdep *tdep; |
39bbf761 | 8100 | struct gdbarch *gdbarch; |
28e97307 DJ |
8101 | struct gdbarch_list *best_arch; |
8102 | enum arm_abi_kind arm_abi = arm_abi_global; | |
8103 | enum arm_float_model fp_model = arm_fp_model; | |
123dc839 | 8104 | struct tdesc_arch_data *tdesc_data = NULL; |
9779414d | 8105 | int i, is_m = 0; |
58d6951d DJ |
8106 | int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0; |
8107 | int have_neon = 0; | |
ff6f572f | 8108 | int have_fpa_registers = 1; |
9779414d DJ |
8109 | const struct target_desc *tdesc = info.target_desc; |
8110 | ||
8111 | /* If we have an object to base this architecture on, try to determine | |
8112 | its ABI. */ | |
8113 | ||
8114 | if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL) | |
8115 | { | |
8116 | int ei_osabi, e_flags; | |
8117 | ||
8118 | switch (bfd_get_flavour (info.abfd)) | |
8119 | { | |
8120 | case bfd_target_aout_flavour: | |
8121 | /* Assume it's an old APCS-style ABI. */ | |
8122 | arm_abi = ARM_ABI_APCS; | |
8123 | break; | |
8124 | ||
8125 | case bfd_target_coff_flavour: | |
8126 | /* Assume it's an old APCS-style ABI. */ | |
8127 | /* XXX WinCE? */ | |
8128 | arm_abi = ARM_ABI_APCS; | |
8129 | break; | |
8130 | ||
8131 | case bfd_target_elf_flavour: | |
8132 | ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI]; | |
8133 | e_flags = elf_elfheader (info.abfd)->e_flags; | |
8134 | ||
8135 | if (ei_osabi == ELFOSABI_ARM) | |
8136 | { | |
8137 | /* GNU tools used to use this value, but do not for EABI | |
8138 | objects. There's nowhere to tag an EABI version | |
8139 | anyway, so assume APCS. */ | |
8140 | arm_abi = ARM_ABI_APCS; | |
8141 | } | |
8142 | else if (ei_osabi == ELFOSABI_NONE) | |
8143 | { | |
8144 | int eabi_ver = EF_ARM_EABI_VERSION (e_flags); | |
8145 | int attr_arch, attr_profile; | |
8146 | ||
8147 | switch (eabi_ver) | |
8148 | { | |
8149 | case EF_ARM_EABI_UNKNOWN: | |
8150 | /* Assume GNU tools. */ | |
8151 | arm_abi = ARM_ABI_APCS; | |
8152 | break; | |
8153 | ||
8154 | case EF_ARM_EABI_VER4: | |
8155 | case EF_ARM_EABI_VER5: | |
8156 | arm_abi = ARM_ABI_AAPCS; | |
8157 | /* EABI binaries default to VFP float ordering. | |
8158 | They may also contain build attributes that can | |
8159 | be used to identify if the VFP argument-passing | |
8160 | ABI is in use. */ | |
8161 | if (fp_model == ARM_FLOAT_AUTO) | |
8162 | { | |
8163 | #ifdef HAVE_ELF | |
8164 | switch (bfd_elf_get_obj_attr_int (info.abfd, | |
8165 | OBJ_ATTR_PROC, | |
8166 | Tag_ABI_VFP_args)) | |
8167 | { | |
8168 | case 0: | |
8169 | /* "The user intended FP parameter/result | |
8170 | passing to conform to AAPCS, base | |
8171 | variant". */ | |
8172 | fp_model = ARM_FLOAT_SOFT_VFP; | |
8173 | break; | |
8174 | case 1: | |
8175 | /* "The user intended FP parameter/result | |
8176 | passing to conform to AAPCS, VFP | |
8177 | variant". */ | |
8178 | fp_model = ARM_FLOAT_VFP; | |
8179 | break; | |
8180 | case 2: | |
8181 | /* "The user intended FP parameter/result | |
8182 | passing to conform to tool chain-specific | |
8183 | conventions" - we don't know any such | |
8184 | conventions, so leave it as "auto". */ | |
8185 | break; | |
8186 | default: | |
8187 | /* Attribute value not mentioned in the | |
8188 | October 2008 ABI, so leave it as | |
8189 | "auto". */ | |
8190 | break; | |
8191 | } | |
8192 | #else | |
8193 | fp_model = ARM_FLOAT_SOFT_VFP; | |
8194 | #endif | |
8195 | } | |
8196 | break; | |
8197 | ||
8198 | default: | |
8199 | /* Leave it as "auto". */ | |
8200 | warning (_("unknown ARM EABI version 0x%x"), eabi_ver); | |
8201 | break; | |
8202 | } | |
8203 | ||
8204 | #ifdef HAVE_ELF | |
8205 | /* Detect M-profile programs. This only works if the | |
8206 | executable file includes build attributes; GCC does | |
8207 | copy them to the executable, but e.g. RealView does | |
8208 | not. */ | |
8209 | attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, | |
8210 | Tag_CPU_arch); | |
0963b4bd MS |
8211 | attr_profile = bfd_elf_get_obj_attr_int (info.abfd, |
8212 | OBJ_ATTR_PROC, | |
9779414d DJ |
8213 | Tag_CPU_arch_profile); |
8214 | /* GCC specifies the profile for v6-M; RealView only | |
8215 | specifies the profile for architectures starting with | |
8216 | V7 (as opposed to architectures with a tag | |
8217 | numerically greater than TAG_CPU_ARCH_V7). */ | |
8218 | if (!tdesc_has_registers (tdesc) | |
8219 | && (attr_arch == TAG_CPU_ARCH_V6_M | |
8220 | || attr_arch == TAG_CPU_ARCH_V6S_M | |
8221 | || attr_profile == 'M')) | |
8222 | tdesc = tdesc_arm_with_m; | |
8223 | #endif | |
8224 | } | |
8225 | ||
8226 | if (fp_model == ARM_FLOAT_AUTO) | |
8227 | { | |
8228 | int e_flags = elf_elfheader (info.abfd)->e_flags; | |
8229 | ||
8230 | switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT)) | |
8231 | { | |
8232 | case 0: | |
8233 | /* Leave it as "auto". Strictly speaking this case | |
8234 | means FPA, but almost nobody uses that now, and | |
8235 | many toolchains fail to set the appropriate bits | |
8236 | for the floating-point model they use. */ | |
8237 | break; | |
8238 | case EF_ARM_SOFT_FLOAT: | |
8239 | fp_model = ARM_FLOAT_SOFT_FPA; | |
8240 | break; | |
8241 | case EF_ARM_VFP_FLOAT: | |
8242 | fp_model = ARM_FLOAT_VFP; | |
8243 | break; | |
8244 | case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT: | |
8245 | fp_model = ARM_FLOAT_SOFT_VFP; | |
8246 | break; | |
8247 | } | |
8248 | } | |
8249 | ||
8250 | if (e_flags & EF_ARM_BE8) | |
8251 | info.byte_order_for_code = BFD_ENDIAN_LITTLE; | |
8252 | ||
8253 | break; | |
8254 | ||
8255 | default: | |
8256 | /* Leave it as "auto". */ | |
8257 | break; | |
8258 | } | |
8259 | } | |
123dc839 DJ |
8260 | |
8261 | /* Check any target description for validity. */ | |
9779414d | 8262 | if (tdesc_has_registers (tdesc)) |
123dc839 DJ |
8263 | { |
8264 | /* For most registers we require GDB's default names; but also allow | |
8265 | the numeric names for sp / lr / pc, as a convenience. */ | |
8266 | static const char *const arm_sp_names[] = { "r13", "sp", NULL }; | |
8267 | static const char *const arm_lr_names[] = { "r14", "lr", NULL }; | |
8268 | static const char *const arm_pc_names[] = { "r15", "pc", NULL }; | |
8269 | ||
8270 | const struct tdesc_feature *feature; | |
58d6951d | 8271 | int valid_p; |
123dc839 | 8272 | |
9779414d | 8273 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
8274 | "org.gnu.gdb.arm.core"); |
8275 | if (feature == NULL) | |
9779414d DJ |
8276 | { |
8277 | feature = tdesc_find_feature (tdesc, | |
8278 | "org.gnu.gdb.arm.m-profile"); | |
8279 | if (feature == NULL) | |
8280 | return NULL; | |
8281 | else | |
8282 | is_m = 1; | |
8283 | } | |
123dc839 DJ |
8284 | |
8285 | tdesc_data = tdesc_data_alloc (); | |
8286 | ||
8287 | valid_p = 1; | |
8288 | for (i = 0; i < ARM_SP_REGNUM; i++) | |
8289 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
8290 | arm_register_names[i]); | |
8291 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
8292 | ARM_SP_REGNUM, | |
8293 | arm_sp_names); | |
8294 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
8295 | ARM_LR_REGNUM, | |
8296 | arm_lr_names); | |
8297 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, | |
8298 | ARM_PC_REGNUM, | |
8299 | arm_pc_names); | |
9779414d DJ |
8300 | if (is_m) |
8301 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
8302 | ARM_PS_REGNUM, "xpsr"); | |
8303 | else | |
8304 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
8305 | ARM_PS_REGNUM, "cpsr"); | |
123dc839 DJ |
8306 | |
8307 | if (!valid_p) | |
8308 | { | |
8309 | tdesc_data_cleanup (tdesc_data); | |
8310 | return NULL; | |
8311 | } | |
8312 | ||
9779414d | 8313 | feature = tdesc_find_feature (tdesc, |
123dc839 DJ |
8314 | "org.gnu.gdb.arm.fpa"); |
8315 | if (feature != NULL) | |
8316 | { | |
8317 | valid_p = 1; | |
8318 | for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++) | |
8319 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
8320 | arm_register_names[i]); | |
8321 | if (!valid_p) | |
8322 | { | |
8323 | tdesc_data_cleanup (tdesc_data); | |
8324 | return NULL; | |
8325 | } | |
8326 | } | |
ff6f572f DJ |
8327 | else |
8328 | have_fpa_registers = 0; | |
8329 | ||
9779414d | 8330 | feature = tdesc_find_feature (tdesc, |
ff6f572f DJ |
8331 | "org.gnu.gdb.xscale.iwmmxt"); |
8332 | if (feature != NULL) | |
8333 | { | |
8334 | static const char *const iwmmxt_names[] = { | |
8335 | "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7", | |
8336 | "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15", | |
8337 | "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "", | |
8338 | "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "", | |
8339 | }; | |
8340 | ||
8341 | valid_p = 1; | |
8342 | for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++) | |
8343 | valid_p | |
8344 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
8345 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
8346 | ||
8347 | /* Check for the control registers, but do not fail if they | |
8348 | are missing. */ | |
8349 | for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++) | |
8350 | tdesc_numbered_register (feature, tdesc_data, i, | |
8351 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
8352 | ||
8353 | for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++) | |
8354 | valid_p | |
8355 | &= tdesc_numbered_register (feature, tdesc_data, i, | |
8356 | iwmmxt_names[i - ARM_WR0_REGNUM]); | |
8357 | ||
8358 | if (!valid_p) | |
8359 | { | |
8360 | tdesc_data_cleanup (tdesc_data); | |
8361 | return NULL; | |
8362 | } | |
8363 | } | |
58d6951d DJ |
8364 | |
8365 | /* If we have a VFP unit, check whether the single precision registers | |
8366 | are present. If not, then we will synthesize them as pseudo | |
8367 | registers. */ | |
9779414d | 8368 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
8369 | "org.gnu.gdb.arm.vfp"); |
8370 | if (feature != NULL) | |
8371 | { | |
8372 | static const char *const vfp_double_names[] = { | |
8373 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
8374 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", | |
8375 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", | |
8376 | "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", | |
8377 | }; | |
8378 | ||
8379 | /* Require the double precision registers. There must be either | |
8380 | 16 or 32. */ | |
8381 | valid_p = 1; | |
8382 | for (i = 0; i < 32; i++) | |
8383 | { | |
8384 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
8385 | ARM_D0_REGNUM + i, | |
8386 | vfp_double_names[i]); | |
8387 | if (!valid_p) | |
8388 | break; | |
8389 | } | |
2b9e5ea6 UW |
8390 | if (!valid_p && i == 16) |
8391 | valid_p = 1; | |
58d6951d | 8392 | |
2b9e5ea6 UW |
8393 | /* Also require FPSCR. */ |
8394 | valid_p &= tdesc_numbered_register (feature, tdesc_data, | |
8395 | ARM_FPSCR_REGNUM, "fpscr"); | |
8396 | if (!valid_p) | |
58d6951d DJ |
8397 | { |
8398 | tdesc_data_cleanup (tdesc_data); | |
8399 | return NULL; | |
8400 | } | |
8401 | ||
8402 | if (tdesc_unnumbered_register (feature, "s0") == 0) | |
8403 | have_vfp_pseudos = 1; | |
8404 | ||
8405 | have_vfp_registers = 1; | |
8406 | ||
8407 | /* If we have VFP, also check for NEON. The architecture allows | |
8408 | NEON without VFP (integer vector operations only), but GDB | |
8409 | does not support that. */ | |
9779414d | 8410 | feature = tdesc_find_feature (tdesc, |
58d6951d DJ |
8411 | "org.gnu.gdb.arm.neon"); |
8412 | if (feature != NULL) | |
8413 | { | |
8414 | /* NEON requires 32 double-precision registers. */ | |
8415 | if (i != 32) | |
8416 | { | |
8417 | tdesc_data_cleanup (tdesc_data); | |
8418 | return NULL; | |
8419 | } | |
8420 | ||
8421 | /* If there are quad registers defined by the stub, use | |
8422 | their type; otherwise (normally) provide them with | |
8423 | the default type. */ | |
8424 | if (tdesc_unnumbered_register (feature, "q0") == 0) | |
8425 | have_neon_pseudos = 1; | |
8426 | ||
8427 | have_neon = 1; | |
8428 | } | |
8429 | } | |
123dc839 | 8430 | } |
39bbf761 | 8431 | |
28e97307 DJ |
8432 | /* If there is already a candidate, use it. */ |
8433 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
8434 | best_arch != NULL; | |
8435 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
8436 | { | |
b8926edc DJ |
8437 | if (arm_abi != ARM_ABI_AUTO |
8438 | && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi) | |
28e97307 DJ |
8439 | continue; |
8440 | ||
b8926edc DJ |
8441 | if (fp_model != ARM_FLOAT_AUTO |
8442 | && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model) | |
28e97307 DJ |
8443 | continue; |
8444 | ||
58d6951d DJ |
8445 | /* There are various other properties in tdep that we do not |
8446 | need to check here: those derived from a target description, | |
8447 | since gdbarches with a different target description are | |
8448 | automatically disqualified. */ | |
8449 | ||
9779414d DJ |
8450 | /* Do check is_m, though, since it might come from the binary. */ |
8451 | if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m) | |
8452 | continue; | |
8453 | ||
28e97307 DJ |
8454 | /* Found a match. */ |
8455 | break; | |
8456 | } | |
97e03143 | 8457 | |
28e97307 | 8458 | if (best_arch != NULL) |
123dc839 DJ |
8459 | { |
8460 | if (tdesc_data != NULL) | |
8461 | tdesc_data_cleanup (tdesc_data); | |
8462 | return best_arch->gdbarch; | |
8463 | } | |
28e97307 DJ |
8464 | |
8465 | tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); | |
97e03143 RE |
8466 | gdbarch = gdbarch_alloc (&info, tdep); |
8467 | ||
28e97307 DJ |
8468 | /* Record additional information about the architecture we are defining. |
8469 | These are gdbarch discriminators, like the OSABI. */ | |
8470 | tdep->arm_abi = arm_abi; | |
8471 | tdep->fp_model = fp_model; | |
9779414d | 8472 | tdep->is_m = is_m; |
ff6f572f | 8473 | tdep->have_fpa_registers = have_fpa_registers; |
58d6951d DJ |
8474 | tdep->have_vfp_registers = have_vfp_registers; |
8475 | tdep->have_vfp_pseudos = have_vfp_pseudos; | |
8476 | tdep->have_neon_pseudos = have_neon_pseudos; | |
8477 | tdep->have_neon = have_neon; | |
08216dd7 RE |
8478 | |
8479 | /* Breakpoints. */ | |
9d4fde75 | 8480 | switch (info.byte_order_for_code) |
67255d04 RE |
8481 | { |
8482 | case BFD_ENDIAN_BIG: | |
66e810cd RE |
8483 | tdep->arm_breakpoint = arm_default_arm_be_breakpoint; |
8484 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint); | |
8485 | tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint; | |
8486 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint); | |
8487 | ||
67255d04 RE |
8488 | break; |
8489 | ||
8490 | case BFD_ENDIAN_LITTLE: | |
66e810cd RE |
8491 | tdep->arm_breakpoint = arm_default_arm_le_breakpoint; |
8492 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint); | |
8493 | tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint; | |
8494 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint); | |
8495 | ||
67255d04 RE |
8496 | break; |
8497 | ||
8498 | default: | |
8499 | internal_error (__FILE__, __LINE__, | |
edefbb7c | 8500 | _("arm_gdbarch_init: bad byte order for float format")); |
67255d04 RE |
8501 | } |
8502 | ||
d7b486e7 RE |
8503 | /* On ARM targets char defaults to unsigned. */ |
8504 | set_gdbarch_char_signed (gdbarch, 0); | |
8505 | ||
cca44b1b JB |
8506 | /* Note: for displaced stepping, this includes the breakpoint, and one word |
8507 | of additional scratch space. This setting isn't used for anything beside | |
8508 | displaced stepping at present. */ | |
8509 | set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS); | |
8510 | ||
9df628e0 | 8511 | /* This should be low enough for everything. */ |
97e03143 | 8512 | tdep->lowest_pc = 0x20; |
94c30b78 | 8513 | tdep->jb_pc = -1; /* Longjump support not enabled by default. */ |
97e03143 | 8514 | |
7c00367c MK |
8515 | /* The default, for both APCS and AAPCS, is to return small |
8516 | structures in registers. */ | |
8517 | tdep->struct_return = reg_struct_return; | |
8518 | ||
2dd604e7 | 8519 | set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call); |
f53f0d0b | 8520 | set_gdbarch_frame_align (gdbarch, arm_frame_align); |
39bbf761 | 8521 | |
756fe439 DJ |
8522 | set_gdbarch_write_pc (gdbarch, arm_write_pc); |
8523 | ||
148754e5 | 8524 | /* Frame handling. */ |
a262aec2 | 8525 | set_gdbarch_dummy_id (gdbarch, arm_dummy_id); |
eb5492fa DJ |
8526 | set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc); |
8527 | set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp); | |
8528 | ||
eb5492fa | 8529 | frame_base_set_default (gdbarch, &arm_normal_base); |
148754e5 | 8530 | |
34e8f22d RE |
8531 | /* Address manipulation. */ |
8532 | set_gdbarch_smash_text_address (gdbarch, arm_smash_text_address); | |
8533 | set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove); | |
8534 | ||
34e8f22d RE |
8535 | /* Advance PC across function entry code. */ |
8536 | set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue); | |
8537 | ||
4024ca99 UW |
8538 | /* Detect whether PC is in function epilogue. */ |
8539 | set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p); | |
8540 | ||
190dce09 UW |
8541 | /* Skip trampolines. */ |
8542 | set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub); | |
8543 | ||
34e8f22d RE |
8544 | /* The stack grows downward. */ |
8545 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
8546 | ||
8547 | /* Breakpoint manipulation. */ | |
8548 | set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc); | |
177321bd DJ |
8549 | set_gdbarch_remote_breakpoint_from_pc (gdbarch, |
8550 | arm_remote_breakpoint_from_pc); | |
34e8f22d RE |
8551 | |
8552 | /* Information about registers, etc. */ | |
34e8f22d RE |
8553 | set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM); |
8554 | set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM); | |
ff6f572f | 8555 | set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS); |
7a5ea0d4 | 8556 | set_gdbarch_register_type (gdbarch, arm_register_type); |
54483882 | 8557 | set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p); |
34e8f22d | 8558 | |
ff6f572f DJ |
8559 | /* This "info float" is FPA-specific. Use the generic version if we |
8560 | do not have FPA. */ | |
8561 | if (gdbarch_tdep (gdbarch)->have_fpa_registers) | |
8562 | set_gdbarch_print_float_info (gdbarch, arm_print_float_info); | |
8563 | ||
26216b98 | 8564 | /* Internal <-> external register number maps. */ |
ff6f572f | 8565 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum); |
26216b98 AC |
8566 | set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno); |
8567 | ||
34e8f22d RE |
8568 | set_gdbarch_register_name (gdbarch, arm_register_name); |
8569 | ||
8570 | /* Returning results. */ | |
2af48f68 | 8571 | set_gdbarch_return_value (gdbarch, arm_return_value); |
34e8f22d | 8572 | |
03d48a7d RE |
8573 | /* Disassembly. */ |
8574 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm); | |
8575 | ||
34e8f22d RE |
8576 | /* Minsymbol frobbing. */ |
8577 | set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special); | |
8578 | set_gdbarch_coff_make_msymbol_special (gdbarch, | |
8579 | arm_coff_make_msymbol_special); | |
60c5725c | 8580 | set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol); |
34e8f22d | 8581 | |
f9d67f43 DJ |
8582 | /* Thumb-2 IT block support. */ |
8583 | set_gdbarch_adjust_breakpoint_address (gdbarch, | |
8584 | arm_adjust_breakpoint_address); | |
8585 | ||
0d5de010 DJ |
8586 | /* Virtual tables. */ |
8587 | set_gdbarch_vbit_in_delta (gdbarch, 1); | |
8588 | ||
97e03143 | 8589 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
4be87837 | 8590 | gdbarch_init_osabi (info, gdbarch); |
97e03143 | 8591 | |
b39cc962 DJ |
8592 | dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg); |
8593 | ||
eb5492fa | 8594 | /* Add some default predicates. */ |
a262aec2 DJ |
8595 | frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind); |
8596 | dwarf2_append_unwinders (gdbarch); | |
0e9e9abd | 8597 | frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind); |
a262aec2 | 8598 | frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind); |
eb5492fa | 8599 | |
97e03143 RE |
8600 | /* Now we have tuned the configuration, set a few final things, |
8601 | based on what the OS ABI has told us. */ | |
8602 | ||
b8926edc DJ |
8603 | /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI |
8604 | binaries are always marked. */ | |
8605 | if (tdep->arm_abi == ARM_ABI_AUTO) | |
8606 | tdep->arm_abi = ARM_ABI_APCS; | |
8607 | ||
e3039479 UW |
8608 | /* Watchpoints are not steppable. */ |
8609 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); | |
8610 | ||
b8926edc DJ |
8611 | /* We used to default to FPA for generic ARM, but almost nobody |
8612 | uses that now, and we now provide a way for the user to force | |
8613 | the model. So default to the most useful variant. */ | |
8614 | if (tdep->fp_model == ARM_FLOAT_AUTO) | |
8615 | tdep->fp_model = ARM_FLOAT_SOFT_FPA; | |
8616 | ||
9df628e0 RE |
8617 | if (tdep->jb_pc >= 0) |
8618 | set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target); | |
8619 | ||
08216dd7 | 8620 | /* Floating point sizes and format. */ |
8da61cc4 | 8621 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
b8926edc | 8622 | if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA) |
08216dd7 | 8623 | { |
8da61cc4 DJ |
8624 | set_gdbarch_double_format |
8625 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
8626 | set_gdbarch_long_double_format | |
8627 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); | |
8628 | } | |
8629 | else | |
8630 | { | |
8631 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
8632 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
08216dd7 RE |
8633 | } |
8634 | ||
58d6951d DJ |
8635 | if (have_vfp_pseudos) |
8636 | { | |
8637 | /* NOTE: These are the only pseudo registers used by | |
8638 | the ARM target at the moment. If more are added, a | |
8639 | little more care in numbering will be needed. */ | |
8640 | ||
8641 | int num_pseudos = 32; | |
8642 | if (have_neon_pseudos) | |
8643 | num_pseudos += 16; | |
8644 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos); | |
8645 | set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read); | |
8646 | set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write); | |
8647 | } | |
8648 | ||
123dc839 | 8649 | if (tdesc_data) |
58d6951d DJ |
8650 | { |
8651 | set_tdesc_pseudo_register_name (gdbarch, arm_register_name); | |
8652 | ||
9779414d | 8653 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
58d6951d DJ |
8654 | |
8655 | /* Override tdesc_register_type to adjust the types of VFP | |
8656 | registers for NEON. */ | |
8657 | set_gdbarch_register_type (gdbarch, arm_register_type); | |
8658 | } | |
123dc839 DJ |
8659 | |
8660 | /* Add standard register aliases. We add aliases even for those | |
8661 | nanes which are used by the current architecture - it's simpler, | |
8662 | and does no harm, since nothing ever lists user registers. */ | |
8663 | for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++) | |
8664 | user_reg_add (gdbarch, arm_register_aliases[i].name, | |
8665 | value_of_arm_user_reg, &arm_register_aliases[i].regnum); | |
8666 | ||
39bbf761 RE |
8667 | return gdbarch; |
8668 | } | |
8669 | ||
97e03143 | 8670 | static void |
2af46ca0 | 8671 | arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
97e03143 | 8672 | { |
2af46ca0 | 8673 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
97e03143 RE |
8674 | |
8675 | if (tdep == NULL) | |
8676 | return; | |
8677 | ||
edefbb7c | 8678 | fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"), |
97e03143 RE |
8679 | (unsigned long) tdep->lowest_pc); |
8680 | } | |
8681 | ||
a78f21af AC |
8682 | extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */ |
8683 | ||
c906108c | 8684 | void |
ed9a39eb | 8685 | _initialize_arm_tdep (void) |
c906108c | 8686 | { |
bc90b915 FN |
8687 | struct ui_file *stb; |
8688 | long length; | |
26304000 | 8689 | struct cmd_list_element *new_set, *new_show; |
53904c9e AC |
8690 | const char *setname; |
8691 | const char *setdesc; | |
4bd7b427 | 8692 | const char *const *regnames; |
bc90b915 FN |
8693 | int numregs, i, j; |
8694 | static char *helptext; | |
edefbb7c AC |
8695 | char regdesc[1024], *rdptr = regdesc; |
8696 | size_t rest = sizeof (regdesc); | |
085dd6e6 | 8697 | |
42cf1509 | 8698 | gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep); |
97e03143 | 8699 | |
60c5725c | 8700 | arm_objfile_data_key |
c1bd65d0 | 8701 | = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free); |
60c5725c | 8702 | |
0e9e9abd UW |
8703 | /* Add ourselves to objfile event chain. */ |
8704 | observer_attach_new_objfile (arm_exidx_new_objfile); | |
8705 | arm_exidx_data_key | |
8706 | = register_objfile_data_with_cleanup (NULL, arm_exidx_data_free); | |
8707 | ||
70f80edf JT |
8708 | /* Register an ELF OS ABI sniffer for ARM binaries. */ |
8709 | gdbarch_register_osabi_sniffer (bfd_arch_arm, | |
8710 | bfd_target_elf_flavour, | |
8711 | arm_elf_osabi_sniffer); | |
8712 | ||
9779414d DJ |
8713 | /* Initialize the standard target descriptions. */ |
8714 | initialize_tdesc_arm_with_m (); | |
8715 | ||
94c30b78 | 8716 | /* Get the number of possible sets of register names defined in opcodes. */ |
afd7eef0 RE |
8717 | num_disassembly_options = get_arm_regname_num_options (); |
8718 | ||
8719 | /* Add root prefix command for all "set arm"/"show arm" commands. */ | |
8720 | add_prefix_cmd ("arm", no_class, set_arm_command, | |
edefbb7c | 8721 | _("Various ARM-specific commands."), |
afd7eef0 RE |
8722 | &setarmcmdlist, "set arm ", 0, &setlist); |
8723 | ||
8724 | add_prefix_cmd ("arm", no_class, show_arm_command, | |
edefbb7c | 8725 | _("Various ARM-specific commands."), |
afd7eef0 | 8726 | &showarmcmdlist, "show arm ", 0, &showlist); |
bc90b915 | 8727 | |
94c30b78 | 8728 | /* Sync the opcode insn printer with our register viewer. */ |
bc90b915 | 8729 | parse_arm_disassembler_option ("reg-names-std"); |
c5aa993b | 8730 | |
eefe576e AC |
8731 | /* Initialize the array that will be passed to |
8732 | add_setshow_enum_cmd(). */ | |
afd7eef0 RE |
8733 | valid_disassembly_styles |
8734 | = xmalloc ((num_disassembly_options + 1) * sizeof (char *)); | |
8735 | for (i = 0; i < num_disassembly_options; i++) | |
bc90b915 FN |
8736 | { |
8737 | numregs = get_arm_regnames (i, &setname, &setdesc, ®names); | |
afd7eef0 | 8738 | valid_disassembly_styles[i] = setname; |
edefbb7c AC |
8739 | length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc); |
8740 | rdptr += length; | |
8741 | rest -= length; | |
123dc839 DJ |
8742 | /* When we find the default names, tell the disassembler to use |
8743 | them. */ | |
bc90b915 FN |
8744 | if (!strcmp (setname, "std")) |
8745 | { | |
afd7eef0 | 8746 | disassembly_style = setname; |
bc90b915 FN |
8747 | set_arm_regname_option (i); |
8748 | } | |
8749 | } | |
94c30b78 | 8750 | /* Mark the end of valid options. */ |
afd7eef0 | 8751 | valid_disassembly_styles[num_disassembly_options] = NULL; |
c906108c | 8752 | |
edefbb7c AC |
8753 | /* Create the help text. */ |
8754 | stb = mem_fileopen (); | |
8755 | fprintf_unfiltered (stb, "%s%s%s", | |
8756 | _("The valid values are:\n"), | |
8757 | regdesc, | |
8758 | _("The default is \"std\".")); | |
759ef836 | 8759 | helptext = ui_file_xstrdup (stb, NULL); |
bc90b915 | 8760 | ui_file_delete (stb); |
ed9a39eb | 8761 | |
edefbb7c AC |
8762 | add_setshow_enum_cmd("disassembler", no_class, |
8763 | valid_disassembly_styles, &disassembly_style, | |
8764 | _("Set the disassembly style."), | |
8765 | _("Show the disassembly style."), | |
8766 | helptext, | |
2c5b56ce | 8767 | set_disassembly_style_sfunc, |
0963b4bd MS |
8768 | NULL, /* FIXME: i18n: The disassembly style is |
8769 | \"%s\". */ | |
7376b4c2 | 8770 | &setarmcmdlist, &showarmcmdlist); |
edefbb7c AC |
8771 | |
8772 | add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32, | |
8773 | _("Set usage of ARM 32-bit mode."), | |
8774 | _("Show usage of ARM 32-bit mode."), | |
8775 | _("When off, a 26-bit PC will be used."), | |
2c5b56ce | 8776 | NULL, |
0963b4bd MS |
8777 | NULL, /* FIXME: i18n: Usage of ARM 32-bit |
8778 | mode is %s. */ | |
26304000 | 8779 | &setarmcmdlist, &showarmcmdlist); |
c906108c | 8780 | |
fd50bc42 | 8781 | /* Add a command to allow the user to force the FPU model. */ |
edefbb7c AC |
8782 | add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model, |
8783 | _("Set the floating point type."), | |
8784 | _("Show the floating point type."), | |
8785 | _("auto - Determine the FP typefrom the OS-ABI.\n\ | |
8786 | softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\ | |
8787 | fpa - FPA co-processor (GCC compiled).\n\ | |
8788 | softvfp - Software FP with pure-endian doubles.\n\ | |
8789 | vfp - VFP co-processor."), | |
edefbb7c | 8790 | set_fp_model_sfunc, show_fp_model, |
7376b4c2 | 8791 | &setarmcmdlist, &showarmcmdlist); |
fd50bc42 | 8792 | |
28e97307 DJ |
8793 | /* Add a command to allow the user to force the ABI. */ |
8794 | add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string, | |
8795 | _("Set the ABI."), | |
8796 | _("Show the ABI."), | |
8797 | NULL, arm_set_abi, arm_show_abi, | |
8798 | &setarmcmdlist, &showarmcmdlist); | |
8799 | ||
0428b8f5 DJ |
8800 | /* Add two commands to allow the user to force the assumed |
8801 | execution mode. */ | |
8802 | add_setshow_enum_cmd ("fallback-mode", class_support, | |
8803 | arm_mode_strings, &arm_fallback_mode_string, | |
8804 | _("Set the mode assumed when symbols are unavailable."), | |
8805 | _("Show the mode assumed when symbols are unavailable."), | |
8806 | NULL, NULL, arm_show_fallback_mode, | |
8807 | &setarmcmdlist, &showarmcmdlist); | |
8808 | add_setshow_enum_cmd ("force-mode", class_support, | |
8809 | arm_mode_strings, &arm_force_mode_string, | |
8810 | _("Set the mode assumed even when symbols are available."), | |
8811 | _("Show the mode assumed even when symbols are available."), | |
8812 | NULL, NULL, arm_show_force_mode, | |
8813 | &setarmcmdlist, &showarmcmdlist); | |
8814 | ||
6529d2dd | 8815 | /* Debugging flag. */ |
edefbb7c AC |
8816 | add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug, |
8817 | _("Set ARM debugging."), | |
8818 | _("Show ARM debugging."), | |
8819 | _("When on, arm-specific debugging is enabled."), | |
2c5b56ce | 8820 | NULL, |
7915a72c | 8821 | NULL, /* FIXME: i18n: "ARM debugging is %s. */ |
26304000 | 8822 | &setdebuglist, &showdebuglist); |
c906108c | 8823 | } |