| 1 | /* Common target dependent code for GDB on ARM systems. |
| 2 | |
| 3 | Copyright (C) 1988-1989, 1991-1993, 1995-1996, 1998-2012 Free |
| 4 | Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include <ctype.h> /* XXX for isupper (). */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "frame.h" |
| 25 | #include "inferior.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "gdb_string.h" |
| 29 | #include "dis-asm.h" /* For register styles. */ |
| 30 | #include "regcache.h" |
| 31 | #include "reggroups.h" |
| 32 | #include "doublest.h" |
| 33 | #include "value.h" |
| 34 | #include "arch-utils.h" |
| 35 | #include "osabi.h" |
| 36 | #include "frame-unwind.h" |
| 37 | #include "frame-base.h" |
| 38 | #include "trad-frame.h" |
| 39 | #include "objfiles.h" |
| 40 | #include "dwarf2-frame.h" |
| 41 | #include "gdbtypes.h" |
| 42 | #include "prologue-value.h" |
| 43 | #include "remote.h" |
| 44 | #include "target-descriptions.h" |
| 45 | #include "user-regs.h" |
| 46 | #include "observer.h" |
| 47 | |
| 48 | #include "arm-tdep.h" |
| 49 | #include "gdb/sim-arm.h" |
| 50 | |
| 51 | #include "elf-bfd.h" |
| 52 | #include "coff/internal.h" |
| 53 | #include "elf/arm.h" |
| 54 | |
| 55 | #include "gdb_assert.h" |
| 56 | #include "vec.h" |
| 57 | |
| 58 | #include "record.h" |
| 59 | |
| 60 | #include "features/arm-with-m.c" |
| 61 | #include "features/arm-with-m-fpa-layout.c" |
| 62 | #include "features/arm-with-m-vfp-d16.c" |
| 63 | #include "features/arm-with-iwmmxt.c" |
| 64 | #include "features/arm-with-vfpv2.c" |
| 65 | #include "features/arm-with-vfpv3.c" |
| 66 | #include "features/arm-with-neon.c" |
| 67 | |
| 68 | static int arm_debug; |
| 69 | |
| 70 | /* Macros for setting and testing a bit in a minimal symbol that marks |
| 71 | it as Thumb function. The MSB of the minimal symbol's "info" field |
| 72 | is used for this purpose. |
| 73 | |
| 74 | MSYMBOL_SET_SPECIAL Actually sets the "special" bit. |
| 75 | MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol. */ |
| 76 | |
| 77 | #define MSYMBOL_SET_SPECIAL(msym) \ |
| 78 | MSYMBOL_TARGET_FLAG_1 (msym) = 1 |
| 79 | |
| 80 | #define MSYMBOL_IS_SPECIAL(msym) \ |
| 81 | MSYMBOL_TARGET_FLAG_1 (msym) |
| 82 | |
| 83 | /* Per-objfile data used for mapping symbols. */ |
| 84 | static const struct objfile_data *arm_objfile_data_key; |
| 85 | |
| 86 | struct arm_mapping_symbol |
| 87 | { |
| 88 | bfd_vma value; |
| 89 | char type; |
| 90 | }; |
| 91 | typedef struct arm_mapping_symbol arm_mapping_symbol_s; |
| 92 | DEF_VEC_O(arm_mapping_symbol_s); |
| 93 | |
| 94 | struct arm_per_objfile |
| 95 | { |
| 96 | VEC(arm_mapping_symbol_s) **section_maps; |
| 97 | }; |
| 98 | |
| 99 | /* The list of available "set arm ..." and "show arm ..." commands. */ |
| 100 | static struct cmd_list_element *setarmcmdlist = NULL; |
| 101 | static struct cmd_list_element *showarmcmdlist = NULL; |
| 102 | |
| 103 | /* The type of floating-point to use. Keep this in sync with enum |
| 104 | arm_float_model, and the help string in _initialize_arm_tdep. */ |
| 105 | static const char *const fp_model_strings[] = |
| 106 | { |
| 107 | "auto", |
| 108 | "softfpa", |
| 109 | "fpa", |
| 110 | "softvfp", |
| 111 | "vfp", |
| 112 | NULL |
| 113 | }; |
| 114 | |
| 115 | /* A variable that can be configured by the user. */ |
| 116 | static enum arm_float_model arm_fp_model = ARM_FLOAT_AUTO; |
| 117 | static const char *current_fp_model = "auto"; |
| 118 | |
| 119 | /* The ABI to use. Keep this in sync with arm_abi_kind. */ |
| 120 | static const char *const arm_abi_strings[] = |
| 121 | { |
| 122 | "auto", |
| 123 | "APCS", |
| 124 | "AAPCS", |
| 125 | NULL |
| 126 | }; |
| 127 | |
| 128 | /* A variable that can be configured by the user. */ |
| 129 | static enum arm_abi_kind arm_abi_global = ARM_ABI_AUTO; |
| 130 | static const char *arm_abi_string = "auto"; |
| 131 | |
| 132 | /* The execution mode to assume. */ |
| 133 | static const char *const arm_mode_strings[] = |
| 134 | { |
| 135 | "auto", |
| 136 | "arm", |
| 137 | "thumb", |
| 138 | NULL |
| 139 | }; |
| 140 | |
| 141 | static const char *arm_fallback_mode_string = "auto"; |
| 142 | static const char *arm_force_mode_string = "auto"; |
| 143 | |
| 144 | /* Internal override of the execution mode. -1 means no override, |
| 145 | 0 means override to ARM mode, 1 means override to Thumb mode. |
| 146 | The effect is the same as if arm_force_mode has been set by the |
| 147 | user (except the internal override has precedence over a user's |
| 148 | arm_force_mode override). */ |
| 149 | static int arm_override_mode = -1; |
| 150 | |
| 151 | /* Number of different reg name sets (options). */ |
| 152 | static int num_disassembly_options; |
| 153 | |
| 154 | /* The standard register names, and all the valid aliases for them. Note |
| 155 | that `fp', `sp' and `pc' are not added in this alias list, because they |
| 156 | have been added as builtin user registers in |
| 157 | std-regs.c:_initialize_frame_reg. */ |
| 158 | static const struct |
| 159 | { |
| 160 | const char *name; |
| 161 | int regnum; |
| 162 | } arm_register_aliases[] = { |
| 163 | /* Basic register numbers. */ |
| 164 | { "r0", 0 }, |
| 165 | { "r1", 1 }, |
| 166 | { "r2", 2 }, |
| 167 | { "r3", 3 }, |
| 168 | { "r4", 4 }, |
| 169 | { "r5", 5 }, |
| 170 | { "r6", 6 }, |
| 171 | { "r7", 7 }, |
| 172 | { "r8", 8 }, |
| 173 | { "r9", 9 }, |
| 174 | { "r10", 10 }, |
| 175 | { "r11", 11 }, |
| 176 | { "r12", 12 }, |
| 177 | { "r13", 13 }, |
| 178 | { "r14", 14 }, |
| 179 | { "r15", 15 }, |
| 180 | /* Synonyms (argument and variable registers). */ |
| 181 | { "a1", 0 }, |
| 182 | { "a2", 1 }, |
| 183 | { "a3", 2 }, |
| 184 | { "a4", 3 }, |
| 185 | { "v1", 4 }, |
| 186 | { "v2", 5 }, |
| 187 | { "v3", 6 }, |
| 188 | { "v4", 7 }, |
| 189 | { "v5", 8 }, |
| 190 | { "v6", 9 }, |
| 191 | { "v7", 10 }, |
| 192 | { "v8", 11 }, |
| 193 | /* Other platform-specific names for r9. */ |
| 194 | { "sb", 9 }, |
| 195 | { "tr", 9 }, |
| 196 | /* Special names. */ |
| 197 | { "ip", 12 }, |
| 198 | { "lr", 14 }, |
| 199 | /* Names used by GCC (not listed in the ARM EABI). */ |
| 200 | { "sl", 10 }, |
| 201 | /* A special name from the older ATPCS. */ |
| 202 | { "wr", 7 }, |
| 203 | }; |
| 204 | |
| 205 | static const char *const arm_register_names[] = |
| 206 | {"r0", "r1", "r2", "r3", /* 0 1 2 3 */ |
| 207 | "r4", "r5", "r6", "r7", /* 4 5 6 7 */ |
| 208 | "r8", "r9", "r10", "r11", /* 8 9 10 11 */ |
| 209 | "r12", "sp", "lr", "pc", /* 12 13 14 15 */ |
| 210 | "f0", "f1", "f2", "f3", /* 16 17 18 19 */ |
| 211 | "f4", "f5", "f6", "f7", /* 20 21 22 23 */ |
| 212 | "fps", "cpsr" }; /* 24 25 */ |
| 213 | |
| 214 | /* Valid register name styles. */ |
| 215 | static const char **valid_disassembly_styles; |
| 216 | |
| 217 | /* Disassembly style to use. Default to "std" register names. */ |
| 218 | static const char *disassembly_style; |
| 219 | |
| 220 | /* This is used to keep the bfd arch_info in sync with the disassembly |
| 221 | style. */ |
| 222 | static void set_disassembly_style_sfunc(char *, int, |
| 223 | struct cmd_list_element *); |
| 224 | static void set_disassembly_style (void); |
| 225 | |
| 226 | static void convert_from_extended (const struct floatformat *, const void *, |
| 227 | void *, int); |
| 228 | static void convert_to_extended (const struct floatformat *, void *, |
| 229 | const void *, int); |
| 230 | |
| 231 | static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch, |
| 232 | struct regcache *regcache, |
| 233 | int regnum, gdb_byte *buf); |
| 234 | static void arm_neon_quad_write (struct gdbarch *gdbarch, |
| 235 | struct regcache *regcache, |
| 236 | int regnum, const gdb_byte *buf); |
| 237 | |
| 238 | static int thumb_insn_size (unsigned short inst1); |
| 239 | |
| 240 | struct arm_prologue_cache |
| 241 | { |
| 242 | /* The stack pointer at the time this frame was created; i.e. the |
| 243 | caller's stack pointer when this function was called. It is used |
| 244 | to identify this frame. */ |
| 245 | CORE_ADDR prev_sp; |
| 246 | |
| 247 | /* The frame base for this frame is just prev_sp - frame size. |
| 248 | FRAMESIZE is the distance from the frame pointer to the |
| 249 | initial stack pointer. */ |
| 250 | |
| 251 | int framesize; |
| 252 | |
| 253 | /* The register used to hold the frame pointer for this frame. */ |
| 254 | int framereg; |
| 255 | |
| 256 | /* Saved register offsets. */ |
| 257 | struct trad_frame_saved_reg *saved_regs; |
| 258 | }; |
| 259 | |
| 260 | static CORE_ADDR arm_analyze_prologue (struct gdbarch *gdbarch, |
| 261 | CORE_ADDR prologue_start, |
| 262 | CORE_ADDR prologue_end, |
| 263 | struct arm_prologue_cache *cache); |
| 264 | |
| 265 | /* Architecture version for displaced stepping. This effects the behaviour of |
| 266 | certain instructions, and really should not be hard-wired. */ |
| 267 | |
| 268 | #define DISPLACED_STEPPING_ARCH_VERSION 5 |
| 269 | |
| 270 | /* Addresses for calling Thumb functions have the bit 0 set. |
| 271 | Here are some macros to test, set, or clear bit 0 of addresses. */ |
| 272 | #define IS_THUMB_ADDR(addr) ((addr) & 1) |
| 273 | #define MAKE_THUMB_ADDR(addr) ((addr) | 1) |
| 274 | #define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1) |
| 275 | |
| 276 | /* Set to true if the 32-bit mode is in use. */ |
| 277 | |
| 278 | int arm_apcs_32 = 1; |
| 279 | |
| 280 | /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */ |
| 281 | |
| 282 | int |
| 283 | arm_psr_thumb_bit (struct gdbarch *gdbarch) |
| 284 | { |
| 285 | if (gdbarch_tdep (gdbarch)->is_m) |
| 286 | return XPSR_T; |
| 287 | else |
| 288 | return CPSR_T; |
| 289 | } |
| 290 | |
| 291 | /* Determine if FRAME is executing in Thumb mode. */ |
| 292 | |
| 293 | int |
| 294 | arm_frame_is_thumb (struct frame_info *frame) |
| 295 | { |
| 296 | CORE_ADDR cpsr; |
| 297 | ULONGEST t_bit = arm_psr_thumb_bit (get_frame_arch (frame)); |
| 298 | |
| 299 | /* Every ARM frame unwinder can unwind the T bit of the CPSR, either |
| 300 | directly (from a signal frame or dummy frame) or by interpreting |
| 301 | the saved LR (from a prologue or DWARF frame). So consult it and |
| 302 | trust the unwinders. */ |
| 303 | cpsr = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
| 304 | |
| 305 | return (cpsr & t_bit) != 0; |
| 306 | } |
| 307 | |
| 308 | /* Callback for VEC_lower_bound. */ |
| 309 | |
| 310 | static inline int |
| 311 | arm_compare_mapping_symbols (const struct arm_mapping_symbol *lhs, |
| 312 | const struct arm_mapping_symbol *rhs) |
| 313 | { |
| 314 | return lhs->value < rhs->value; |
| 315 | } |
| 316 | |
| 317 | /* Search for the mapping symbol covering MEMADDR. If one is found, |
| 318 | return its type. Otherwise, return 0. If START is non-NULL, |
| 319 | set *START to the location of the mapping symbol. */ |
| 320 | |
| 321 | static char |
| 322 | arm_find_mapping_symbol (CORE_ADDR memaddr, CORE_ADDR *start) |
| 323 | { |
| 324 | struct obj_section *sec; |
| 325 | |
| 326 | /* If there are mapping symbols, consult them. */ |
| 327 | sec = find_pc_section (memaddr); |
| 328 | if (sec != NULL) |
| 329 | { |
| 330 | struct arm_per_objfile *data; |
| 331 | VEC(arm_mapping_symbol_s) *map; |
| 332 | struct arm_mapping_symbol map_key = { memaddr - obj_section_addr (sec), |
| 333 | 0 }; |
| 334 | unsigned int idx; |
| 335 | |
| 336 | data = objfile_data (sec->objfile, arm_objfile_data_key); |
| 337 | if (data != NULL) |
| 338 | { |
| 339 | map = data->section_maps[sec->the_bfd_section->index]; |
| 340 | if (!VEC_empty (arm_mapping_symbol_s, map)) |
| 341 | { |
| 342 | struct arm_mapping_symbol *map_sym; |
| 343 | |
| 344 | idx = VEC_lower_bound (arm_mapping_symbol_s, map, &map_key, |
| 345 | arm_compare_mapping_symbols); |
| 346 | |
| 347 | /* VEC_lower_bound finds the earliest ordered insertion |
| 348 | point. If the following symbol starts at this exact |
| 349 | address, we use that; otherwise, the preceding |
| 350 | mapping symbol covers this address. */ |
| 351 | if (idx < VEC_length (arm_mapping_symbol_s, map)) |
| 352 | { |
| 353 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx); |
| 354 | if (map_sym->value == map_key.value) |
| 355 | { |
| 356 | if (start) |
| 357 | *start = map_sym->value + obj_section_addr (sec); |
| 358 | return map_sym->type; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | if (idx > 0) |
| 363 | { |
| 364 | map_sym = VEC_index (arm_mapping_symbol_s, map, idx - 1); |
| 365 | if (start) |
| 366 | *start = map_sym->value + obj_section_addr (sec); |
| 367 | return map_sym->type; |
| 368 | } |
| 369 | } |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | /* Determine if the program counter specified in MEMADDR is in a Thumb |
| 377 | function. This function should be called for addresses unrelated to |
| 378 | any executing frame; otherwise, prefer arm_frame_is_thumb. */ |
| 379 | |
| 380 | int |
| 381 | arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr) |
| 382 | { |
| 383 | struct obj_section *sec; |
| 384 | struct minimal_symbol *sym; |
| 385 | char type; |
| 386 | struct displaced_step_closure* dsc |
| 387 | = get_displaced_step_closure_by_addr(memaddr); |
| 388 | |
| 389 | /* If checking the mode of displaced instruction in copy area, the mode |
| 390 | should be determined by instruction on the original address. */ |
| 391 | if (dsc) |
| 392 | { |
| 393 | if (debug_displaced) |
| 394 | fprintf_unfiltered (gdb_stdlog, |
| 395 | "displaced: check mode of %.8lx instead of %.8lx\n", |
| 396 | (unsigned long) dsc->insn_addr, |
| 397 | (unsigned long) memaddr); |
| 398 | memaddr = dsc->insn_addr; |
| 399 | } |
| 400 | |
| 401 | /* If bit 0 of the address is set, assume this is a Thumb address. */ |
| 402 | if (IS_THUMB_ADDR (memaddr)) |
| 403 | return 1; |
| 404 | |
| 405 | /* Respect internal mode override if active. */ |
| 406 | if (arm_override_mode != -1) |
| 407 | return arm_override_mode; |
| 408 | |
| 409 | /* If the user wants to override the symbol table, let him. */ |
| 410 | if (strcmp (arm_force_mode_string, "arm") == 0) |
| 411 | return 0; |
| 412 | if (strcmp (arm_force_mode_string, "thumb") == 0) |
| 413 | return 1; |
| 414 | |
| 415 | /* ARM v6-M and v7-M are always in Thumb mode. */ |
| 416 | if (gdbarch_tdep (gdbarch)->is_m) |
| 417 | return 1; |
| 418 | |
| 419 | /* If there are mapping symbols, consult them. */ |
| 420 | type = arm_find_mapping_symbol (memaddr, NULL); |
| 421 | if (type) |
| 422 | return type == 't'; |
| 423 | |
| 424 | /* Thumb functions have a "special" bit set in minimal symbols. */ |
| 425 | sym = lookup_minimal_symbol_by_pc (memaddr); |
| 426 | if (sym) |
| 427 | return (MSYMBOL_IS_SPECIAL (sym)); |
| 428 | |
| 429 | /* If the user wants to override the fallback mode, let them. */ |
| 430 | if (strcmp (arm_fallback_mode_string, "arm") == 0) |
| 431 | return 0; |
| 432 | if (strcmp (arm_fallback_mode_string, "thumb") == 0) |
| 433 | return 1; |
| 434 | |
| 435 | /* If we couldn't find any symbol, but we're talking to a running |
| 436 | target, then trust the current value of $cpsr. This lets |
| 437 | "display/i $pc" always show the correct mode (though if there is |
| 438 | a symbol table we will not reach here, so it still may not be |
| 439 | displayed in the mode it will be executed). */ |
| 440 | if (target_has_registers) |
| 441 | return arm_frame_is_thumb (get_current_frame ()); |
| 442 | |
| 443 | /* Otherwise we're out of luck; we assume ARM. */ |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | /* Remove useless bits from addresses in a running program. */ |
| 448 | static CORE_ADDR |
| 449 | arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val) |
| 450 | { |
| 451 | if (arm_apcs_32) |
| 452 | return UNMAKE_THUMB_ADDR (val); |
| 453 | else |
| 454 | return (val & 0x03fffffc); |
| 455 | } |
| 456 | |
| 457 | /* When reading symbols, we need to zap the low bit of the address, |
| 458 | which may be set to 1 for Thumb functions. */ |
| 459 | static CORE_ADDR |
| 460 | arm_smash_text_address (struct gdbarch *gdbarch, CORE_ADDR val) |
| 461 | { |
| 462 | return val & ~1; |
| 463 | } |
| 464 | |
| 465 | /* Return 1 if PC is the start of a compiler helper function which |
| 466 | can be safely ignored during prologue skipping. IS_THUMB is true |
| 467 | if the function is known to be a Thumb function due to the way it |
| 468 | is being called. */ |
| 469 | static int |
| 470 | skip_prologue_function (struct gdbarch *gdbarch, CORE_ADDR pc, int is_thumb) |
| 471 | { |
| 472 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 473 | struct minimal_symbol *msym; |
| 474 | |
| 475 | msym = lookup_minimal_symbol_by_pc (pc); |
| 476 | if (msym != NULL |
| 477 | && SYMBOL_VALUE_ADDRESS (msym) == pc |
| 478 | && SYMBOL_LINKAGE_NAME (msym) != NULL) |
| 479 | { |
| 480 | const char *name = SYMBOL_LINKAGE_NAME (msym); |
| 481 | |
| 482 | /* The GNU linker's Thumb call stub to foo is named |
| 483 | __foo_from_thumb. */ |
| 484 | if (strstr (name, "_from_thumb") != NULL) |
| 485 | name += 2; |
| 486 | |
| 487 | /* On soft-float targets, __truncdfsf2 is called to convert promoted |
| 488 | arguments to their argument types in non-prototyped |
| 489 | functions. */ |
| 490 | if (strncmp (name, "__truncdfsf2", strlen ("__truncdfsf2")) == 0) |
| 491 | return 1; |
| 492 | if (strncmp (name, "__aeabi_d2f", strlen ("__aeabi_d2f")) == 0) |
| 493 | return 1; |
| 494 | |
| 495 | /* Internal functions related to thread-local storage. */ |
| 496 | if (strncmp (name, "__tls_get_addr", strlen ("__tls_get_addr")) == 0) |
| 497 | return 1; |
| 498 | if (strncmp (name, "__aeabi_read_tp", strlen ("__aeabi_read_tp")) == 0) |
| 499 | return 1; |
| 500 | } |
| 501 | else |
| 502 | { |
| 503 | /* If we run against a stripped glibc, we may be unable to identify |
| 504 | special functions by name. Check for one important case, |
| 505 | __aeabi_read_tp, by comparing the *code* against the default |
| 506 | implementation (this is hand-written ARM assembler in glibc). */ |
| 507 | |
| 508 | if (!is_thumb |
| 509 | && read_memory_unsigned_integer (pc, 4, byte_order_for_code) |
| 510 | == 0xe3e00a0f /* mov r0, #0xffff0fff */ |
| 511 | && read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code) |
| 512 | == 0xe240f01f) /* sub pc, r0, #31 */ |
| 513 | return 1; |
| 514 | } |
| 515 | |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | /* Support routines for instruction parsing. */ |
| 520 | #define submask(x) ((1L << ((x) + 1)) - 1) |
| 521 | #define bit(obj,st) (((obj) >> (st)) & 1) |
| 522 | #define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st))) |
| 523 | #define sbits(obj,st,fn) \ |
| 524 | ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st)))) |
| 525 | #define BranchDest(addr,instr) \ |
| 526 | ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2))) |
| 527 | |
| 528 | /* Extract the immediate from instruction movw/movt of encoding T. INSN1 is |
| 529 | the first 16-bit of instruction, and INSN2 is the second 16-bit of |
| 530 | instruction. */ |
| 531 | #define EXTRACT_MOVW_MOVT_IMM_T(insn1, insn2) \ |
| 532 | ((bits ((insn1), 0, 3) << 12) \ |
| 533 | | (bits ((insn1), 10, 10) << 11) \ |
| 534 | | (bits ((insn2), 12, 14) << 8) \ |
| 535 | | bits ((insn2), 0, 7)) |
| 536 | |
| 537 | /* Extract the immediate from instruction movw/movt of encoding A. INSN is |
| 538 | the 32-bit instruction. */ |
| 539 | #define EXTRACT_MOVW_MOVT_IMM_A(insn) \ |
| 540 | ((bits ((insn), 16, 19) << 12) \ |
| 541 | | bits ((insn), 0, 11)) |
| 542 | |
| 543 | /* Decode immediate value; implements ThumbExpandImmediate pseudo-op. */ |
| 544 | |
| 545 | static unsigned int |
| 546 | thumb_expand_immediate (unsigned int imm) |
| 547 | { |
| 548 | unsigned int count = imm >> 7; |
| 549 | |
| 550 | if (count < 8) |
| 551 | switch (count / 2) |
| 552 | { |
| 553 | case 0: |
| 554 | return imm & 0xff; |
| 555 | case 1: |
| 556 | return (imm & 0xff) | ((imm & 0xff) << 16); |
| 557 | case 2: |
| 558 | return ((imm & 0xff) << 8) | ((imm & 0xff) << 24); |
| 559 | case 3: |
| 560 | return (imm & 0xff) | ((imm & 0xff) << 8) |
| 561 | | ((imm & 0xff) << 16) | ((imm & 0xff) << 24); |
| 562 | } |
| 563 | |
| 564 | return (0x80 | (imm & 0x7f)) << (32 - count); |
| 565 | } |
| 566 | |
| 567 | /* Return 1 if the 16-bit Thumb instruction INST might change |
| 568 | control flow, 0 otherwise. */ |
| 569 | |
| 570 | static int |
| 571 | thumb_instruction_changes_pc (unsigned short inst) |
| 572 | { |
| 573 | if ((inst & 0xff00) == 0xbd00) /* pop {rlist, pc} */ |
| 574 | return 1; |
| 575 | |
| 576 | if ((inst & 0xf000) == 0xd000) /* conditional branch */ |
| 577 | return 1; |
| 578 | |
| 579 | if ((inst & 0xf800) == 0xe000) /* unconditional branch */ |
| 580 | return 1; |
| 581 | |
| 582 | if ((inst & 0xff00) == 0x4700) /* bx REG, blx REG */ |
| 583 | return 1; |
| 584 | |
| 585 | if ((inst & 0xff87) == 0x4687) /* mov pc, REG */ |
| 586 | return 1; |
| 587 | |
| 588 | if ((inst & 0xf500) == 0xb100) /* CBNZ or CBZ. */ |
| 589 | return 1; |
| 590 | |
| 591 | return 0; |
| 592 | } |
| 593 | |
| 594 | /* Return 1 if the 32-bit Thumb instruction in INST1 and INST2 |
| 595 | might change control flow, 0 otherwise. */ |
| 596 | |
| 597 | static int |
| 598 | thumb2_instruction_changes_pc (unsigned short inst1, unsigned short inst2) |
| 599 | { |
| 600 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) |
| 601 | { |
| 602 | /* Branches and miscellaneous control instructions. */ |
| 603 | |
| 604 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) |
| 605 | { |
| 606 | /* B, BL, BLX. */ |
| 607 | return 1; |
| 608 | } |
| 609 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) |
| 610 | { |
| 611 | /* SUBS PC, LR, #imm8. */ |
| 612 | return 1; |
| 613 | } |
| 614 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) |
| 615 | { |
| 616 | /* Conditional branch. */ |
| 617 | return 1; |
| 618 | } |
| 619 | |
| 620 | return 0; |
| 621 | } |
| 622 | |
| 623 | if ((inst1 & 0xfe50) == 0xe810) |
| 624 | { |
| 625 | /* Load multiple or RFE. */ |
| 626 | |
| 627 | if (bit (inst1, 7) && !bit (inst1, 8)) |
| 628 | { |
| 629 | /* LDMIA or POP */ |
| 630 | if (bit (inst2, 15)) |
| 631 | return 1; |
| 632 | } |
| 633 | else if (!bit (inst1, 7) && bit (inst1, 8)) |
| 634 | { |
| 635 | /* LDMDB */ |
| 636 | if (bit (inst2, 15)) |
| 637 | return 1; |
| 638 | } |
| 639 | else if (bit (inst1, 7) && bit (inst1, 8)) |
| 640 | { |
| 641 | /* RFEIA */ |
| 642 | return 1; |
| 643 | } |
| 644 | else if (!bit (inst1, 7) && !bit (inst1, 8)) |
| 645 | { |
| 646 | /* RFEDB */ |
| 647 | return 1; |
| 648 | } |
| 649 | |
| 650 | return 0; |
| 651 | } |
| 652 | |
| 653 | if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) |
| 654 | { |
| 655 | /* MOV PC or MOVS PC. */ |
| 656 | return 1; |
| 657 | } |
| 658 | |
| 659 | if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) |
| 660 | { |
| 661 | /* LDR PC. */ |
| 662 | if (bits (inst1, 0, 3) == 15) |
| 663 | return 1; |
| 664 | if (bit (inst1, 7)) |
| 665 | return 1; |
| 666 | if (bit (inst2, 11)) |
| 667 | return 1; |
| 668 | if ((inst2 & 0x0fc0) == 0x0000) |
| 669 | return 1; |
| 670 | |
| 671 | return 0; |
| 672 | } |
| 673 | |
| 674 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) |
| 675 | { |
| 676 | /* TBB. */ |
| 677 | return 1; |
| 678 | } |
| 679 | |
| 680 | if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) |
| 681 | { |
| 682 | /* TBH. */ |
| 683 | return 1; |
| 684 | } |
| 685 | |
| 686 | return 0; |
| 687 | } |
| 688 | |
| 689 | /* Analyze a Thumb prologue, looking for a recognizable stack frame |
| 690 | and frame pointer. Scan until we encounter a store that could |
| 691 | clobber the stack frame unexpectedly, or an unknown instruction. |
| 692 | Return the last address which is definitely safe to skip for an |
| 693 | initial breakpoint. */ |
| 694 | |
| 695 | static CORE_ADDR |
| 696 | thumb_analyze_prologue (struct gdbarch *gdbarch, |
| 697 | CORE_ADDR start, CORE_ADDR limit, |
| 698 | struct arm_prologue_cache *cache) |
| 699 | { |
| 700 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 701 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 702 | int i; |
| 703 | pv_t regs[16]; |
| 704 | struct pv_area *stack; |
| 705 | struct cleanup *back_to; |
| 706 | CORE_ADDR offset; |
| 707 | CORE_ADDR unrecognized_pc = 0; |
| 708 | |
| 709 | for (i = 0; i < 16; i++) |
| 710 | regs[i] = pv_register (i, 0); |
| 711 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
| 712 | back_to = make_cleanup_free_pv_area (stack); |
| 713 | |
| 714 | while (start < limit) |
| 715 | { |
| 716 | unsigned short insn; |
| 717 | |
| 718 | insn = read_memory_unsigned_integer (start, 2, byte_order_for_code); |
| 719 | |
| 720 | if ((insn & 0xfe00) == 0xb400) /* push { rlist } */ |
| 721 | { |
| 722 | int regno; |
| 723 | int mask; |
| 724 | |
| 725 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
| 726 | break; |
| 727 | |
| 728 | /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says |
| 729 | whether to save LR (R14). */ |
| 730 | mask = (insn & 0xff) | ((insn & 0x100) << 6); |
| 731 | |
| 732 | /* Calculate offsets of saved R0-R7 and LR. */ |
| 733 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) |
| 734 | if (mask & (1 << regno)) |
| 735 | { |
| 736 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
| 737 | -4); |
| 738 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); |
| 739 | } |
| 740 | } |
| 741 | else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR |
| 742 | sub sp, #simm */ |
| 743 | { |
| 744 | offset = (insn & 0x7f) << 2; /* get scaled offset */ |
| 745 | if (insn & 0x80) /* Check for SUB. */ |
| 746 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
| 747 | -offset); |
| 748 | else |
| 749 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], |
| 750 | offset); |
| 751 | } |
| 752 | else if ((insn & 0xf800) == 0xa800) /* add Rd, sp, #imm */ |
| 753 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[ARM_SP_REGNUM], |
| 754 | (insn & 0xff) << 2); |
| 755 | else if ((insn & 0xfe00) == 0x1c00 /* add Rd, Rn, #imm */ |
| 756 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) |
| 757 | regs[bits (insn, 0, 2)] = pv_add_constant (regs[bits (insn, 3, 5)], |
| 758 | bits (insn, 6, 8)); |
| 759 | else if ((insn & 0xf800) == 0x3000 /* add Rd, #imm */ |
| 760 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) |
| 761 | regs[bits (insn, 8, 10)] = pv_add_constant (regs[bits (insn, 8, 10)], |
| 762 | bits (insn, 0, 7)); |
| 763 | else if ((insn & 0xfe00) == 0x1800 /* add Rd, Rn, Rm */ |
| 764 | && pv_is_register (regs[bits (insn, 6, 8)], ARM_SP_REGNUM) |
| 765 | && pv_is_constant (regs[bits (insn, 3, 5)])) |
| 766 | regs[bits (insn, 0, 2)] = pv_add (regs[bits (insn, 3, 5)], |
| 767 | regs[bits (insn, 6, 8)]); |
| 768 | else if ((insn & 0xff00) == 0x4400 /* add Rd, Rm */ |
| 769 | && pv_is_constant (regs[bits (insn, 3, 6)])) |
| 770 | { |
| 771 | int rd = (bit (insn, 7) << 3) + bits (insn, 0, 2); |
| 772 | int rm = bits (insn, 3, 6); |
| 773 | regs[rd] = pv_add (regs[rd], regs[rm]); |
| 774 | } |
| 775 | else if ((insn & 0xff00) == 0x4600) /* mov hi, lo or mov lo, hi */ |
| 776 | { |
| 777 | int dst_reg = (insn & 0x7) + ((insn & 0x80) >> 4); |
| 778 | int src_reg = (insn & 0x78) >> 3; |
| 779 | regs[dst_reg] = regs[src_reg]; |
| 780 | } |
| 781 | else if ((insn & 0xf800) == 0x9000) /* str rd, [sp, #off] */ |
| 782 | { |
| 783 | /* Handle stores to the stack. Normally pushes are used, |
| 784 | but with GCC -mtpcs-frame, there may be other stores |
| 785 | in the prologue to create the frame. */ |
| 786 | int regno = (insn >> 8) & 0x7; |
| 787 | pv_t addr; |
| 788 | |
| 789 | offset = (insn & 0xff) << 2; |
| 790 | addr = pv_add_constant (regs[ARM_SP_REGNUM], offset); |
| 791 | |
| 792 | if (pv_area_store_would_trash (stack, addr)) |
| 793 | break; |
| 794 | |
| 795 | pv_area_store (stack, addr, 4, regs[regno]); |
| 796 | } |
| 797 | else if ((insn & 0xf800) == 0x6000) /* str rd, [rn, #off] */ |
| 798 | { |
| 799 | int rd = bits (insn, 0, 2); |
| 800 | int rn = bits (insn, 3, 5); |
| 801 | pv_t addr; |
| 802 | |
| 803 | offset = bits (insn, 6, 10) << 2; |
| 804 | addr = pv_add_constant (regs[rn], offset); |
| 805 | |
| 806 | if (pv_area_store_would_trash (stack, addr)) |
| 807 | break; |
| 808 | |
| 809 | pv_area_store (stack, addr, 4, regs[rd]); |
| 810 | } |
| 811 | else if (((insn & 0xf800) == 0x7000 /* strb Rd, [Rn, #off] */ |
| 812 | || (insn & 0xf800) == 0x8000) /* strh Rd, [Rn, #off] */ |
| 813 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM)) |
| 814 | /* Ignore stores of argument registers to the stack. */ |
| 815 | ; |
| 816 | else if ((insn & 0xf800) == 0xc800 /* ldmia Rn!, { registers } */ |
| 817 | && pv_is_register (regs[bits (insn, 8, 10)], ARM_SP_REGNUM)) |
| 818 | /* Ignore block loads from the stack, potentially copying |
| 819 | parameters from memory. */ |
| 820 | ; |
| 821 | else if ((insn & 0xf800) == 0x9800 /* ldr Rd, [Rn, #immed] */ |
| 822 | || ((insn & 0xf800) == 0x6800 /* ldr Rd, [sp, #immed] */ |
| 823 | && pv_is_register (regs[bits (insn, 3, 5)], ARM_SP_REGNUM))) |
| 824 | /* Similarly ignore single loads from the stack. */ |
| 825 | ; |
| 826 | else if ((insn & 0xffc0) == 0x0000 /* lsls Rd, Rm, #0 */ |
| 827 | || (insn & 0xffc0) == 0x1c00) /* add Rd, Rn, #0 */ |
| 828 | /* Skip register copies, i.e. saves to another register |
| 829 | instead of the stack. */ |
| 830 | ; |
| 831 | else if ((insn & 0xf800) == 0x2000) /* movs Rd, #imm */ |
| 832 | /* Recognize constant loads; even with small stacks these are necessary |
| 833 | on Thumb. */ |
| 834 | regs[bits (insn, 8, 10)] = pv_constant (bits (insn, 0, 7)); |
| 835 | else if ((insn & 0xf800) == 0x4800) /* ldr Rd, [pc, #imm] */ |
| 836 | { |
| 837 | /* Constant pool loads, for the same reason. */ |
| 838 | unsigned int constant; |
| 839 | CORE_ADDR loc; |
| 840 | |
| 841 | loc = start + 4 + bits (insn, 0, 7) * 4; |
| 842 | constant = read_memory_unsigned_integer (loc, 4, byte_order); |
| 843 | regs[bits (insn, 8, 10)] = pv_constant (constant); |
| 844 | } |
| 845 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instructions. */ |
| 846 | { |
| 847 | unsigned short inst2; |
| 848 | |
| 849 | inst2 = read_memory_unsigned_integer (start + 2, 2, |
| 850 | byte_order_for_code); |
| 851 | |
| 852 | if ((insn & 0xf800) == 0xf000 && (inst2 & 0xe800) == 0xe800) |
| 853 | { |
| 854 | /* BL, BLX. Allow some special function calls when |
| 855 | skipping the prologue; GCC generates these before |
| 856 | storing arguments to the stack. */ |
| 857 | CORE_ADDR nextpc; |
| 858 | int j1, j2, imm1, imm2; |
| 859 | |
| 860 | imm1 = sbits (insn, 0, 10); |
| 861 | imm2 = bits (inst2, 0, 10); |
| 862 | j1 = bit (inst2, 13); |
| 863 | j2 = bit (inst2, 11); |
| 864 | |
| 865 | offset = ((imm1 << 12) + (imm2 << 1)); |
| 866 | offset ^= ((!j2) << 22) | ((!j1) << 23); |
| 867 | |
| 868 | nextpc = start + 4 + offset; |
| 869 | /* For BLX make sure to clear the low bits. */ |
| 870 | if (bit (inst2, 12) == 0) |
| 871 | nextpc = nextpc & 0xfffffffc; |
| 872 | |
| 873 | if (!skip_prologue_function (gdbarch, nextpc, |
| 874 | bit (inst2, 12) != 0)) |
| 875 | break; |
| 876 | } |
| 877 | |
| 878 | else if ((insn & 0xffd0) == 0xe900 /* stmdb Rn{!}, |
| 879 | { registers } */ |
| 880 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 881 | { |
| 882 | pv_t addr = regs[bits (insn, 0, 3)]; |
| 883 | int regno; |
| 884 | |
| 885 | if (pv_area_store_would_trash (stack, addr)) |
| 886 | break; |
| 887 | |
| 888 | /* Calculate offsets of saved registers. */ |
| 889 | for (regno = ARM_LR_REGNUM; regno >= 0; regno--) |
| 890 | if (inst2 & (1 << regno)) |
| 891 | { |
| 892 | addr = pv_add_constant (addr, -4); |
| 893 | pv_area_store (stack, addr, 4, regs[regno]); |
| 894 | } |
| 895 | |
| 896 | if (insn & 0x0020) |
| 897 | regs[bits (insn, 0, 3)] = addr; |
| 898 | } |
| 899 | |
| 900 | else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2, |
| 901 | [Rn, #+/-imm]{!} */ |
| 902 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 903 | { |
| 904 | int regno1 = bits (inst2, 12, 15); |
| 905 | int regno2 = bits (inst2, 8, 11); |
| 906 | pv_t addr = regs[bits (insn, 0, 3)]; |
| 907 | |
| 908 | offset = inst2 & 0xff; |
| 909 | if (insn & 0x0080) |
| 910 | addr = pv_add_constant (addr, offset); |
| 911 | else |
| 912 | addr = pv_add_constant (addr, -offset); |
| 913 | |
| 914 | if (pv_area_store_would_trash (stack, addr)) |
| 915 | break; |
| 916 | |
| 917 | pv_area_store (stack, addr, 4, regs[regno1]); |
| 918 | pv_area_store (stack, pv_add_constant (addr, 4), |
| 919 | 4, regs[regno2]); |
| 920 | |
| 921 | if (insn & 0x0020) |
| 922 | regs[bits (insn, 0, 3)] = addr; |
| 923 | } |
| 924 | |
| 925 | else if ((insn & 0xfff0) == 0xf8c0 /* str Rt,[Rn,+/-#imm]{!} */ |
| 926 | && (inst2 & 0x0c00) == 0x0c00 |
| 927 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 928 | { |
| 929 | int regno = bits (inst2, 12, 15); |
| 930 | pv_t addr = regs[bits (insn, 0, 3)]; |
| 931 | |
| 932 | offset = inst2 & 0xff; |
| 933 | if (inst2 & 0x0200) |
| 934 | addr = pv_add_constant (addr, offset); |
| 935 | else |
| 936 | addr = pv_add_constant (addr, -offset); |
| 937 | |
| 938 | if (pv_area_store_would_trash (stack, addr)) |
| 939 | break; |
| 940 | |
| 941 | pv_area_store (stack, addr, 4, regs[regno]); |
| 942 | |
| 943 | if (inst2 & 0x0100) |
| 944 | regs[bits (insn, 0, 3)] = addr; |
| 945 | } |
| 946 | |
| 947 | else if ((insn & 0xfff0) == 0xf8c0 /* str.w Rt,[Rn,#imm] */ |
| 948 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 949 | { |
| 950 | int regno = bits (inst2, 12, 15); |
| 951 | pv_t addr; |
| 952 | |
| 953 | offset = inst2 & 0xfff; |
| 954 | addr = pv_add_constant (regs[bits (insn, 0, 3)], offset); |
| 955 | |
| 956 | if (pv_area_store_would_trash (stack, addr)) |
| 957 | break; |
| 958 | |
| 959 | pv_area_store (stack, addr, 4, regs[regno]); |
| 960 | } |
| 961 | |
| 962 | else if ((insn & 0xffd0) == 0xf880 /* str{bh}.w Rt,[Rn,#imm] */ |
| 963 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 964 | /* Ignore stores of argument registers to the stack. */ |
| 965 | ; |
| 966 | |
| 967 | else if ((insn & 0xffd0) == 0xf800 /* str{bh} Rt,[Rn,#+/-imm] */ |
| 968 | && (inst2 & 0x0d00) == 0x0c00 |
| 969 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 970 | /* Ignore stores of argument registers to the stack. */ |
| 971 | ; |
| 972 | |
| 973 | else if ((insn & 0xffd0) == 0xe890 /* ldmia Rn[!], |
| 974 | { registers } */ |
| 975 | && (inst2 & 0x8000) == 0x0000 |
| 976 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 977 | /* Ignore block loads from the stack, potentially copying |
| 978 | parameters from memory. */ |
| 979 | ; |
| 980 | |
| 981 | else if ((insn & 0xffb0) == 0xe950 /* ldrd Rt, Rt2, |
| 982 | [Rn, #+/-imm] */ |
| 983 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 984 | /* Similarly ignore dual loads from the stack. */ |
| 985 | ; |
| 986 | |
| 987 | else if ((insn & 0xfff0) == 0xf850 /* ldr Rt,[Rn,#+/-imm] */ |
| 988 | && (inst2 & 0x0d00) == 0x0c00 |
| 989 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 990 | /* Similarly ignore single loads from the stack. */ |
| 991 | ; |
| 992 | |
| 993 | else if ((insn & 0xfff0) == 0xf8d0 /* ldr.w Rt,[Rn,#imm] */ |
| 994 | && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM)) |
| 995 | /* Similarly ignore single loads from the stack. */ |
| 996 | ; |
| 997 | |
| 998 | else if ((insn & 0xfbf0) == 0xf100 /* add.w Rd, Rn, #imm */ |
| 999 | && (inst2 & 0x8000) == 0x0000) |
| 1000 | { |
| 1001 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
| 1002 | | (bits (inst2, 12, 14) << 8) |
| 1003 | | bits (inst2, 0, 7)); |
| 1004 | |
| 1005 | regs[bits (inst2, 8, 11)] |
| 1006 | = pv_add_constant (regs[bits (insn, 0, 3)], |
| 1007 | thumb_expand_immediate (imm)); |
| 1008 | } |
| 1009 | |
| 1010 | else if ((insn & 0xfbf0) == 0xf200 /* addw Rd, Rn, #imm */ |
| 1011 | && (inst2 & 0x8000) == 0x0000) |
| 1012 | { |
| 1013 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
| 1014 | | (bits (inst2, 12, 14) << 8) |
| 1015 | | bits (inst2, 0, 7)); |
| 1016 | |
| 1017 | regs[bits (inst2, 8, 11)] |
| 1018 | = pv_add_constant (regs[bits (insn, 0, 3)], imm); |
| 1019 | } |
| 1020 | |
| 1021 | else if ((insn & 0xfbf0) == 0xf1a0 /* sub.w Rd, Rn, #imm */ |
| 1022 | && (inst2 & 0x8000) == 0x0000) |
| 1023 | { |
| 1024 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
| 1025 | | (bits (inst2, 12, 14) << 8) |
| 1026 | | bits (inst2, 0, 7)); |
| 1027 | |
| 1028 | regs[bits (inst2, 8, 11)] |
| 1029 | = pv_add_constant (regs[bits (insn, 0, 3)], |
| 1030 | - (CORE_ADDR) thumb_expand_immediate (imm)); |
| 1031 | } |
| 1032 | |
| 1033 | else if ((insn & 0xfbf0) == 0xf2a0 /* subw Rd, Rn, #imm */ |
| 1034 | && (inst2 & 0x8000) == 0x0000) |
| 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_add_constant (regs[bits (insn, 0, 3)], - (CORE_ADDR) imm); |
| 1042 | } |
| 1043 | |
| 1044 | else if ((insn & 0xfbff) == 0xf04f) /* mov.w Rd, #const */ |
| 1045 | { |
| 1046 | unsigned int imm = ((bits (insn, 10, 10) << 11) |
| 1047 | | (bits (inst2, 12, 14) << 8) |
| 1048 | | bits (inst2, 0, 7)); |
| 1049 | |
| 1050 | regs[bits (inst2, 8, 11)] |
| 1051 | = pv_constant (thumb_expand_immediate (imm)); |
| 1052 | } |
| 1053 | |
| 1054 | else if ((insn & 0xfbf0) == 0xf240) /* movw Rd, #const */ |
| 1055 | { |
| 1056 | unsigned int imm |
| 1057 | = EXTRACT_MOVW_MOVT_IMM_T (insn, inst2); |
| 1058 | |
| 1059 | regs[bits (inst2, 8, 11)] = pv_constant (imm); |
| 1060 | } |
| 1061 | |
| 1062 | else if (insn == 0xea5f /* mov.w Rd,Rm */ |
| 1063 | && (inst2 & 0xf0f0) == 0) |
| 1064 | { |
| 1065 | int dst_reg = (inst2 & 0x0f00) >> 8; |
| 1066 | int src_reg = inst2 & 0xf; |
| 1067 | regs[dst_reg] = regs[src_reg]; |
| 1068 | } |
| 1069 | |
| 1070 | else if ((insn & 0xff7f) == 0xf85f) /* ldr.w Rt,<label> */ |
| 1071 | { |
| 1072 | /* Constant pool loads. */ |
| 1073 | unsigned int constant; |
| 1074 | CORE_ADDR loc; |
| 1075 | |
| 1076 | offset = bits (insn, 0, 11); |
| 1077 | if (insn & 0x0080) |
| 1078 | loc = start + 4 + offset; |
| 1079 | else |
| 1080 | loc = start + 4 - offset; |
| 1081 | |
| 1082 | constant = read_memory_unsigned_integer (loc, 4, byte_order); |
| 1083 | regs[bits (inst2, 12, 15)] = pv_constant (constant); |
| 1084 | } |
| 1085 | |
| 1086 | else if ((insn & 0xff7f) == 0xe95f) /* ldrd Rt,Rt2,<label> */ |
| 1087 | { |
| 1088 | /* Constant pool loads. */ |
| 1089 | unsigned int constant; |
| 1090 | CORE_ADDR loc; |
| 1091 | |
| 1092 | offset = bits (insn, 0, 7) << 2; |
| 1093 | if (insn & 0x0080) |
| 1094 | loc = start + 4 + offset; |
| 1095 | else |
| 1096 | loc = start + 4 - offset; |
| 1097 | |
| 1098 | constant = read_memory_unsigned_integer (loc, 4, byte_order); |
| 1099 | regs[bits (inst2, 12, 15)] = pv_constant (constant); |
| 1100 | |
| 1101 | constant = read_memory_unsigned_integer (loc + 4, 4, byte_order); |
| 1102 | regs[bits (inst2, 8, 11)] = pv_constant (constant); |
| 1103 | } |
| 1104 | |
| 1105 | else if (thumb2_instruction_changes_pc (insn, inst2)) |
| 1106 | { |
| 1107 | /* Don't scan past anything that might change control flow. */ |
| 1108 | break; |
| 1109 | } |
| 1110 | else |
| 1111 | { |
| 1112 | /* The optimizer might shove anything into the prologue, |
| 1113 | so we just skip what we don't recognize. */ |
| 1114 | unrecognized_pc = start; |
| 1115 | } |
| 1116 | |
| 1117 | start += 2; |
| 1118 | } |
| 1119 | else if (thumb_instruction_changes_pc (insn)) |
| 1120 | { |
| 1121 | /* Don't scan past anything that might change control flow. */ |
| 1122 | break; |
| 1123 | } |
| 1124 | else |
| 1125 | { |
| 1126 | /* The optimizer might shove anything into the prologue, |
| 1127 | so we just skip what we don't recognize. */ |
| 1128 | unrecognized_pc = start; |
| 1129 | } |
| 1130 | |
| 1131 | start += 2; |
| 1132 | } |
| 1133 | |
| 1134 | if (arm_debug) |
| 1135 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", |
| 1136 | paddress (gdbarch, start)); |
| 1137 | |
| 1138 | if (unrecognized_pc == 0) |
| 1139 | unrecognized_pc = start; |
| 1140 | |
| 1141 | if (cache == NULL) |
| 1142 | { |
| 1143 | do_cleanups (back_to); |
| 1144 | return unrecognized_pc; |
| 1145 | } |
| 1146 | |
| 1147 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
| 1148 | { |
| 1149 | /* Frame pointer is fp. Frame size is constant. */ |
| 1150 | cache->framereg = ARM_FP_REGNUM; |
| 1151 | cache->framesize = -regs[ARM_FP_REGNUM].k; |
| 1152 | } |
| 1153 | else if (pv_is_register (regs[THUMB_FP_REGNUM], ARM_SP_REGNUM)) |
| 1154 | { |
| 1155 | /* Frame pointer is r7. Frame size is constant. */ |
| 1156 | cache->framereg = THUMB_FP_REGNUM; |
| 1157 | cache->framesize = -regs[THUMB_FP_REGNUM].k; |
| 1158 | } |
| 1159 | else |
| 1160 | { |
| 1161 | /* Try the stack pointer... this is a bit desperate. */ |
| 1162 | cache->framereg = ARM_SP_REGNUM; |
| 1163 | cache->framesize = -regs[ARM_SP_REGNUM].k; |
| 1164 | } |
| 1165 | |
| 1166 | for (i = 0; i < 16; i++) |
| 1167 | if (pv_area_find_reg (stack, gdbarch, i, &offset)) |
| 1168 | cache->saved_regs[i].addr = offset; |
| 1169 | |
| 1170 | do_cleanups (back_to); |
| 1171 | return unrecognized_pc; |
| 1172 | } |
| 1173 | |
| 1174 | |
| 1175 | /* Try to analyze the instructions starting from PC, which load symbol |
| 1176 | __stack_chk_guard. Return the address of instruction after loading this |
| 1177 | symbol, set the dest register number to *BASEREG, and set the size of |
| 1178 | instructions for loading symbol in OFFSET. Return 0 if instructions are |
| 1179 | not recognized. */ |
| 1180 | |
| 1181 | static CORE_ADDR |
| 1182 | arm_analyze_load_stack_chk_guard(CORE_ADDR pc, struct gdbarch *gdbarch, |
| 1183 | unsigned int *destreg, int *offset) |
| 1184 | { |
| 1185 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 1186 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); |
| 1187 | unsigned int low, high, address; |
| 1188 | |
| 1189 | address = 0; |
| 1190 | if (is_thumb) |
| 1191 | { |
| 1192 | unsigned short insn1 |
| 1193 | = read_memory_unsigned_integer (pc, 2, byte_order_for_code); |
| 1194 | |
| 1195 | if ((insn1 & 0xf800) == 0x4800) /* ldr Rd, #immed */ |
| 1196 | { |
| 1197 | *destreg = bits (insn1, 8, 10); |
| 1198 | *offset = 2; |
| 1199 | address = bits (insn1, 0, 7); |
| 1200 | } |
| 1201 | else if ((insn1 & 0xfbf0) == 0xf240) /* movw Rd, #const */ |
| 1202 | { |
| 1203 | unsigned short insn2 |
| 1204 | = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); |
| 1205 | |
| 1206 | low = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); |
| 1207 | |
| 1208 | insn1 |
| 1209 | = read_memory_unsigned_integer (pc + 4, 2, byte_order_for_code); |
| 1210 | insn2 |
| 1211 | = read_memory_unsigned_integer (pc + 6, 2, byte_order_for_code); |
| 1212 | |
| 1213 | /* movt Rd, #const */ |
| 1214 | if ((insn1 & 0xfbc0) == 0xf2c0) |
| 1215 | { |
| 1216 | high = EXTRACT_MOVW_MOVT_IMM_T (insn1, insn2); |
| 1217 | *destreg = bits (insn2, 8, 11); |
| 1218 | *offset = 8; |
| 1219 | address = (high << 16 | low); |
| 1220 | } |
| 1221 | } |
| 1222 | } |
| 1223 | else |
| 1224 | { |
| 1225 | unsigned int insn |
| 1226 | = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
| 1227 | |
| 1228 | if ((insn & 0x0e5f0000) == 0x041f0000) /* ldr Rd, #immed */ |
| 1229 | { |
| 1230 | address = bits (insn, 0, 11); |
| 1231 | *destreg = bits (insn, 12, 15); |
| 1232 | *offset = 4; |
| 1233 | } |
| 1234 | else if ((insn & 0x0ff00000) == 0x03000000) /* movw Rd, #const */ |
| 1235 | { |
| 1236 | low = EXTRACT_MOVW_MOVT_IMM_A (insn); |
| 1237 | |
| 1238 | insn |
| 1239 | = read_memory_unsigned_integer (pc + 4, 4, byte_order_for_code); |
| 1240 | |
| 1241 | if ((insn & 0x0ff00000) == 0x03400000) /* movt Rd, #const */ |
| 1242 | { |
| 1243 | high = EXTRACT_MOVW_MOVT_IMM_A (insn); |
| 1244 | *destreg = bits (insn, 12, 15); |
| 1245 | *offset = 8; |
| 1246 | address = (high << 16 | low); |
| 1247 | } |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | return address; |
| 1252 | } |
| 1253 | |
| 1254 | /* Try to skip a sequence of instructions used for stack protector. If PC |
| 1255 | points to the first instruction of this sequence, return the address of |
| 1256 | first instruction after this sequence, otherwise, return original PC. |
| 1257 | |
| 1258 | On arm, this sequence of instructions is composed of mainly three steps, |
| 1259 | Step 1: load symbol __stack_chk_guard, |
| 1260 | Step 2: load from address of __stack_chk_guard, |
| 1261 | Step 3: store it to somewhere else. |
| 1262 | |
| 1263 | Usually, instructions on step 2 and step 3 are the same on various ARM |
| 1264 | architectures. On step 2, it is one instruction 'ldr Rx, [Rn, #0]', and |
| 1265 | on step 3, it is also one instruction 'str Rx, [r7, #immd]'. However, |
| 1266 | instructions in step 1 vary from different ARM architectures. On ARMv7, |
| 1267 | they are, |
| 1268 | |
| 1269 | movw Rn, #:lower16:__stack_chk_guard |
| 1270 | movt Rn, #:upper16:__stack_chk_guard |
| 1271 | |
| 1272 | On ARMv5t, it is, |
| 1273 | |
| 1274 | ldr Rn, .Label |
| 1275 | .... |
| 1276 | .Lable: |
| 1277 | .word __stack_chk_guard |
| 1278 | |
| 1279 | Since ldr/str is a very popular instruction, we can't use them as |
| 1280 | 'fingerprint' or 'signature' of stack protector sequence. Here we choose |
| 1281 | sequence {movw/movt, ldr}/ldr/str plus symbol __stack_chk_guard, if not |
| 1282 | stripped, as the 'fingerprint' of a stack protector cdoe sequence. */ |
| 1283 | |
| 1284 | static CORE_ADDR |
| 1285 | arm_skip_stack_protector(CORE_ADDR pc, struct gdbarch *gdbarch) |
| 1286 | { |
| 1287 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 1288 | unsigned int address, basereg; |
| 1289 | struct minimal_symbol *stack_chk_guard; |
| 1290 | int offset; |
| 1291 | int is_thumb = arm_pc_is_thumb (gdbarch, pc); |
| 1292 | CORE_ADDR addr; |
| 1293 | |
| 1294 | /* Try to parse the instructions in Step 1. */ |
| 1295 | addr = arm_analyze_load_stack_chk_guard (pc, gdbarch, |
| 1296 | &basereg, &offset); |
| 1297 | if (!addr) |
| 1298 | return pc; |
| 1299 | |
| 1300 | stack_chk_guard = lookup_minimal_symbol_by_pc (addr); |
| 1301 | /* If name of symbol doesn't start with '__stack_chk_guard', this |
| 1302 | instruction sequence is not for stack protector. If symbol is |
| 1303 | removed, we conservatively think this sequence is for stack protector. */ |
| 1304 | if (stack_chk_guard |
| 1305 | && strncmp (SYMBOL_LINKAGE_NAME (stack_chk_guard), "__stack_chk_guard", |
| 1306 | strlen ("__stack_chk_guard")) != 0) |
| 1307 | return pc; |
| 1308 | |
| 1309 | if (is_thumb) |
| 1310 | { |
| 1311 | unsigned int destreg; |
| 1312 | unsigned short insn |
| 1313 | = read_memory_unsigned_integer (pc + offset, 2, byte_order_for_code); |
| 1314 | |
| 1315 | /* Step 2: ldr Rd, [Rn, #immed], encoding T1. */ |
| 1316 | if ((insn & 0xf800) != 0x6800) |
| 1317 | return pc; |
| 1318 | if (bits (insn, 3, 5) != basereg) |
| 1319 | return pc; |
| 1320 | destreg = bits (insn, 0, 2); |
| 1321 | |
| 1322 | insn = read_memory_unsigned_integer (pc + offset + 2, 2, |
| 1323 | byte_order_for_code); |
| 1324 | /* Step 3: str Rd, [Rn, #immed], encoding T1. */ |
| 1325 | if ((insn & 0xf800) != 0x6000) |
| 1326 | return pc; |
| 1327 | if (destreg != bits (insn, 0, 2)) |
| 1328 | return pc; |
| 1329 | } |
| 1330 | else |
| 1331 | { |
| 1332 | unsigned int destreg; |
| 1333 | unsigned int insn |
| 1334 | = read_memory_unsigned_integer (pc + offset, 4, byte_order_for_code); |
| 1335 | |
| 1336 | /* Step 2: ldr Rd, [Rn, #immed], encoding A1. */ |
| 1337 | if ((insn & 0x0e500000) != 0x04100000) |
| 1338 | return pc; |
| 1339 | if (bits (insn, 16, 19) != basereg) |
| 1340 | return pc; |
| 1341 | destreg = bits (insn, 12, 15); |
| 1342 | /* Step 3: str Rd, [Rn, #immed], encoding A1. */ |
| 1343 | insn = read_memory_unsigned_integer (pc + offset + 4, |
| 1344 | 4, byte_order_for_code); |
| 1345 | if ((insn & 0x0e500000) != 0x04000000) |
| 1346 | return pc; |
| 1347 | if (bits (insn, 12, 15) != destreg) |
| 1348 | return pc; |
| 1349 | } |
| 1350 | /* The size of total two instructions ldr/str is 4 on Thumb-2, while 8 |
| 1351 | on arm. */ |
| 1352 | if (is_thumb) |
| 1353 | return pc + offset + 4; |
| 1354 | else |
| 1355 | return pc + offset + 8; |
| 1356 | } |
| 1357 | |
| 1358 | /* Advance the PC across any function entry prologue instructions to |
| 1359 | reach some "real" code. |
| 1360 | |
| 1361 | The APCS (ARM Procedure Call Standard) defines the following |
| 1362 | prologue: |
| 1363 | |
| 1364 | mov ip, sp |
| 1365 | [stmfd sp!, {a1,a2,a3,a4}] |
| 1366 | stmfd sp!, {...,fp,ip,lr,pc} |
| 1367 | [stfe f7, [sp, #-12]!] |
| 1368 | [stfe f6, [sp, #-12]!] |
| 1369 | [stfe f5, [sp, #-12]!] |
| 1370 | [stfe f4, [sp, #-12]!] |
| 1371 | sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn. */ |
| 1372 | |
| 1373 | static CORE_ADDR |
| 1374 | arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 1375 | { |
| 1376 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 1377 | unsigned long inst; |
| 1378 | CORE_ADDR skip_pc; |
| 1379 | CORE_ADDR func_addr, limit_pc; |
| 1380 | struct symtab_and_line sal; |
| 1381 | |
| 1382 | /* See if we can determine the end of the prologue via the symbol table. |
| 1383 | If so, then return either PC, or the PC after the prologue, whichever |
| 1384 | is greater. */ |
| 1385 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) |
| 1386 | { |
| 1387 | CORE_ADDR post_prologue_pc |
| 1388 | = skip_prologue_using_sal (gdbarch, func_addr); |
| 1389 | struct symtab *s = find_pc_symtab (func_addr); |
| 1390 | |
| 1391 | if (post_prologue_pc) |
| 1392 | post_prologue_pc |
| 1393 | = arm_skip_stack_protector (post_prologue_pc, gdbarch); |
| 1394 | |
| 1395 | |
| 1396 | /* GCC always emits a line note before the prologue and another |
| 1397 | one after, even if the two are at the same address or on the |
| 1398 | same line. Take advantage of this so that we do not need to |
| 1399 | know every instruction that might appear in the prologue. We |
| 1400 | will have producer information for most binaries; if it is |
| 1401 | missing (e.g. for -gstabs), assuming the GNU tools. */ |
| 1402 | if (post_prologue_pc |
| 1403 | && (s == NULL |
| 1404 | || s->producer == NULL |
| 1405 | || strncmp (s->producer, "GNU ", sizeof ("GNU ") - 1) == 0)) |
| 1406 | return post_prologue_pc; |
| 1407 | |
| 1408 | if (post_prologue_pc != 0) |
| 1409 | { |
| 1410 | CORE_ADDR analyzed_limit; |
| 1411 | |
| 1412 | /* For non-GCC compilers, make sure the entire line is an |
| 1413 | acceptable prologue; GDB will round this function's |
| 1414 | return value up to the end of the following line so we |
| 1415 | can not skip just part of a line (and we do not want to). |
| 1416 | |
| 1417 | RealView does not treat the prologue specially, but does |
| 1418 | associate prologue code with the opening brace; so this |
| 1419 | lets us skip the first line if we think it is the opening |
| 1420 | brace. */ |
| 1421 | if (arm_pc_is_thumb (gdbarch, func_addr)) |
| 1422 | analyzed_limit = thumb_analyze_prologue (gdbarch, func_addr, |
| 1423 | post_prologue_pc, NULL); |
| 1424 | else |
| 1425 | analyzed_limit = arm_analyze_prologue (gdbarch, func_addr, |
| 1426 | post_prologue_pc, NULL); |
| 1427 | |
| 1428 | if (analyzed_limit != post_prologue_pc) |
| 1429 | return func_addr; |
| 1430 | |
| 1431 | return post_prologue_pc; |
| 1432 | } |
| 1433 | } |
| 1434 | |
| 1435 | /* Can't determine prologue from the symbol table, need to examine |
| 1436 | instructions. */ |
| 1437 | |
| 1438 | /* Find an upper limit on the function prologue using the debug |
| 1439 | information. If the debug information could not be used to provide |
| 1440 | that bound, then use an arbitrary large number as the upper bound. */ |
| 1441 | /* Like arm_scan_prologue, stop no later than pc + 64. */ |
| 1442 | limit_pc = skip_prologue_using_sal (gdbarch, pc); |
| 1443 | if (limit_pc == 0) |
| 1444 | limit_pc = pc + 64; /* Magic. */ |
| 1445 | |
| 1446 | |
| 1447 | /* Check if this is Thumb code. */ |
| 1448 | if (arm_pc_is_thumb (gdbarch, pc)) |
| 1449 | return thumb_analyze_prologue (gdbarch, pc, limit_pc, NULL); |
| 1450 | |
| 1451 | for (skip_pc = pc; skip_pc < limit_pc; skip_pc += 4) |
| 1452 | { |
| 1453 | inst = read_memory_unsigned_integer (skip_pc, 4, byte_order_for_code); |
| 1454 | |
| 1455 | /* "mov ip, sp" is no longer a required part of the prologue. */ |
| 1456 | if (inst == 0xe1a0c00d) /* mov ip, sp */ |
| 1457 | continue; |
| 1458 | |
| 1459 | if ((inst & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */ |
| 1460 | continue; |
| 1461 | |
| 1462 | if ((inst & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */ |
| 1463 | continue; |
| 1464 | |
| 1465 | /* Some prologues begin with "str lr, [sp, #-4]!". */ |
| 1466 | if (inst == 0xe52de004) /* str lr, [sp, #-4]! */ |
| 1467 | continue; |
| 1468 | |
| 1469 | if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */ |
| 1470 | continue; |
| 1471 | |
| 1472 | if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */ |
| 1473 | continue; |
| 1474 | |
| 1475 | /* Any insns after this point may float into the code, if it makes |
| 1476 | for better instruction scheduling, so we skip them only if we |
| 1477 | find them, but still consider the function to be frame-ful. */ |
| 1478 | |
| 1479 | /* We may have either one sfmfd instruction here, or several stfe |
| 1480 | insns, depending on the version of floating point code we |
| 1481 | support. */ |
| 1482 | if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */ |
| 1483 | continue; |
| 1484 | |
| 1485 | if ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */ |
| 1486 | continue; |
| 1487 | |
| 1488 | if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */ |
| 1489 | continue; |
| 1490 | |
| 1491 | if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */ |
| 1492 | continue; |
| 1493 | |
| 1494 | if ((inst & 0xffffc000) == 0xe54b0000 /* strb r(0123),[r11,#-nn] */ |
| 1495 | || (inst & 0xffffc0f0) == 0xe14b00b0 /* strh r(0123),[r11,#-nn] */ |
| 1496 | || (inst & 0xffffc000) == 0xe50b0000) /* str r(0123),[r11,#-nn] */ |
| 1497 | continue; |
| 1498 | |
| 1499 | if ((inst & 0xffffc000) == 0xe5cd0000 /* strb r(0123),[sp,#nn] */ |
| 1500 | || (inst & 0xffffc0f0) == 0xe1cd00b0 /* strh r(0123),[sp,#nn] */ |
| 1501 | || (inst & 0xffffc000) == 0xe58d0000) /* str r(0123),[sp,#nn] */ |
| 1502 | continue; |
| 1503 | |
| 1504 | /* Un-recognized instruction; stop scanning. */ |
| 1505 | break; |
| 1506 | } |
| 1507 | |
| 1508 | return skip_pc; /* End of prologue. */ |
| 1509 | } |
| 1510 | |
| 1511 | /* *INDENT-OFF* */ |
| 1512 | /* Function: thumb_scan_prologue (helper function for arm_scan_prologue) |
| 1513 | This function decodes a Thumb function prologue to determine: |
| 1514 | 1) the size of the stack frame |
| 1515 | 2) which registers are saved on it |
| 1516 | 3) the offsets of saved regs |
| 1517 | 4) the offset from the stack pointer to the frame pointer |
| 1518 | |
| 1519 | A typical Thumb function prologue would create this stack frame |
| 1520 | (offsets relative to FP) |
| 1521 | old SP -> 24 stack parameters |
| 1522 | 20 LR |
| 1523 | 16 R7 |
| 1524 | R7 -> 0 local variables (16 bytes) |
| 1525 | SP -> -12 additional stack space (12 bytes) |
| 1526 | The frame size would thus be 36 bytes, and the frame offset would be |
| 1527 | 12 bytes. The frame register is R7. |
| 1528 | |
| 1529 | The comments for thumb_skip_prolog() describe the algorithm we use |
| 1530 | to detect the end of the prolog. */ |
| 1531 | /* *INDENT-ON* */ |
| 1532 | |
| 1533 | static void |
| 1534 | thumb_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR prev_pc, |
| 1535 | CORE_ADDR block_addr, struct arm_prologue_cache *cache) |
| 1536 | { |
| 1537 | CORE_ADDR prologue_start; |
| 1538 | CORE_ADDR prologue_end; |
| 1539 | CORE_ADDR current_pc; |
| 1540 | |
| 1541 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
| 1542 | &prologue_end)) |
| 1543 | { |
| 1544 | /* See comment in arm_scan_prologue for an explanation of |
| 1545 | this heuristics. */ |
| 1546 | if (prologue_end > prologue_start + 64) |
| 1547 | { |
| 1548 | prologue_end = prologue_start + 64; |
| 1549 | } |
| 1550 | } |
| 1551 | else |
| 1552 | /* We're in the boondocks: we have no idea where the start of the |
| 1553 | function is. */ |
| 1554 | return; |
| 1555 | |
| 1556 | prologue_end = min (prologue_end, prev_pc); |
| 1557 | |
| 1558 | thumb_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); |
| 1559 | } |
| 1560 | |
| 1561 | /* Return 1 if THIS_INSTR might change control flow, 0 otherwise. */ |
| 1562 | |
| 1563 | static int |
| 1564 | arm_instruction_changes_pc (uint32_t this_instr) |
| 1565 | { |
| 1566 | if (bits (this_instr, 28, 31) == INST_NV) |
| 1567 | /* Unconditional instructions. */ |
| 1568 | switch (bits (this_instr, 24, 27)) |
| 1569 | { |
| 1570 | case 0xa: |
| 1571 | case 0xb: |
| 1572 | /* Branch with Link and change to Thumb. */ |
| 1573 | return 1; |
| 1574 | case 0xc: |
| 1575 | case 0xd: |
| 1576 | case 0xe: |
| 1577 | /* Coprocessor register transfer. */ |
| 1578 | if (bits (this_instr, 12, 15) == 15) |
| 1579 | error (_("Invalid update to pc in instruction")); |
| 1580 | return 0; |
| 1581 | default: |
| 1582 | return 0; |
| 1583 | } |
| 1584 | else |
| 1585 | switch (bits (this_instr, 25, 27)) |
| 1586 | { |
| 1587 | case 0x0: |
| 1588 | if (bits (this_instr, 23, 24) == 2 && bit (this_instr, 20) == 0) |
| 1589 | { |
| 1590 | /* Multiplies and extra load/stores. */ |
| 1591 | if (bit (this_instr, 4) == 1 && bit (this_instr, 7) == 1) |
| 1592 | /* Neither multiplies nor extension load/stores are allowed |
| 1593 | to modify PC. */ |
| 1594 | return 0; |
| 1595 | |
| 1596 | /* Otherwise, miscellaneous instructions. */ |
| 1597 | |
| 1598 | /* BX <reg>, BXJ <reg>, BLX <reg> */ |
| 1599 | if (bits (this_instr, 4, 27) == 0x12fff1 |
| 1600 | || bits (this_instr, 4, 27) == 0x12fff2 |
| 1601 | || bits (this_instr, 4, 27) == 0x12fff3) |
| 1602 | return 1; |
| 1603 | |
| 1604 | /* Other miscellaneous instructions are unpredictable if they |
| 1605 | modify PC. */ |
| 1606 | return 0; |
| 1607 | } |
| 1608 | /* Data processing instruction. Fall through. */ |
| 1609 | |
| 1610 | case 0x1: |
| 1611 | if (bits (this_instr, 12, 15) == 15) |
| 1612 | return 1; |
| 1613 | else |
| 1614 | return 0; |
| 1615 | |
| 1616 | case 0x2: |
| 1617 | case 0x3: |
| 1618 | /* Media instructions and architecturally undefined instructions. */ |
| 1619 | if (bits (this_instr, 25, 27) == 3 && bit (this_instr, 4) == 1) |
| 1620 | return 0; |
| 1621 | |
| 1622 | /* Stores. */ |
| 1623 | if (bit (this_instr, 20) == 0) |
| 1624 | return 0; |
| 1625 | |
| 1626 | /* Loads. */ |
| 1627 | if (bits (this_instr, 12, 15) == ARM_PC_REGNUM) |
| 1628 | return 1; |
| 1629 | else |
| 1630 | return 0; |
| 1631 | |
| 1632 | case 0x4: |
| 1633 | /* Load/store multiple. */ |
| 1634 | if (bit (this_instr, 20) == 1 && bit (this_instr, 15) == 1) |
| 1635 | return 1; |
| 1636 | else |
| 1637 | return 0; |
| 1638 | |
| 1639 | case 0x5: |
| 1640 | /* Branch and branch with link. */ |
| 1641 | return 1; |
| 1642 | |
| 1643 | case 0x6: |
| 1644 | case 0x7: |
| 1645 | /* Coprocessor transfers or SWIs can not affect PC. */ |
| 1646 | return 0; |
| 1647 | |
| 1648 | default: |
| 1649 | internal_error (__FILE__, __LINE__, _("bad value in switch")); |
| 1650 | } |
| 1651 | } |
| 1652 | |
| 1653 | /* Analyze an ARM mode prologue starting at PROLOGUE_START and |
| 1654 | continuing no further than PROLOGUE_END. If CACHE is non-NULL, |
| 1655 | fill it in. Return the first address not recognized as a prologue |
| 1656 | instruction. |
| 1657 | |
| 1658 | We recognize all the instructions typically found in ARM prologues, |
| 1659 | plus harmless instructions which can be skipped (either for analysis |
| 1660 | purposes, or a more restrictive set that can be skipped when finding |
| 1661 | the end of the prologue). */ |
| 1662 | |
| 1663 | static CORE_ADDR |
| 1664 | arm_analyze_prologue (struct gdbarch *gdbarch, |
| 1665 | CORE_ADDR prologue_start, CORE_ADDR prologue_end, |
| 1666 | struct arm_prologue_cache *cache) |
| 1667 | { |
| 1668 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1669 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 1670 | int regno; |
| 1671 | CORE_ADDR offset, current_pc; |
| 1672 | pv_t regs[ARM_FPS_REGNUM]; |
| 1673 | struct pv_area *stack; |
| 1674 | struct cleanup *back_to; |
| 1675 | int framereg, framesize; |
| 1676 | CORE_ADDR unrecognized_pc = 0; |
| 1677 | |
| 1678 | /* Search the prologue looking for instructions that set up the |
| 1679 | frame pointer, adjust the stack pointer, and save registers. |
| 1680 | |
| 1681 | Be careful, however, and if it doesn't look like a prologue, |
| 1682 | don't try to scan it. If, for instance, a frameless function |
| 1683 | begins with stmfd sp!, then we will tell ourselves there is |
| 1684 | a frame, which will confuse stack traceback, as well as "finish" |
| 1685 | and other operations that rely on a knowledge of the stack |
| 1686 | traceback. */ |
| 1687 | |
| 1688 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) |
| 1689 | regs[regno] = pv_register (regno, 0); |
| 1690 | stack = make_pv_area (ARM_SP_REGNUM, gdbarch_addr_bit (gdbarch)); |
| 1691 | back_to = make_cleanup_free_pv_area (stack); |
| 1692 | |
| 1693 | for (current_pc = prologue_start; |
| 1694 | current_pc < prologue_end; |
| 1695 | current_pc += 4) |
| 1696 | { |
| 1697 | unsigned int insn |
| 1698 | = read_memory_unsigned_integer (current_pc, 4, byte_order_for_code); |
| 1699 | |
| 1700 | if (insn == 0xe1a0c00d) /* mov ip, sp */ |
| 1701 | { |
| 1702 | regs[ARM_IP_REGNUM] = regs[ARM_SP_REGNUM]; |
| 1703 | continue; |
| 1704 | } |
| 1705 | else if ((insn & 0xfff00000) == 0xe2800000 /* add Rd, Rn, #n */ |
| 1706 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
| 1707 | { |
| 1708 | unsigned imm = insn & 0xff; /* immediate value */ |
| 1709 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ |
| 1710 | int rd = bits (insn, 12, 15); |
| 1711 | imm = (imm >> rot) | (imm << (32 - rot)); |
| 1712 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], imm); |
| 1713 | continue; |
| 1714 | } |
| 1715 | else if ((insn & 0xfff00000) == 0xe2400000 /* sub Rd, Rn, #n */ |
| 1716 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
| 1717 | { |
| 1718 | unsigned imm = insn & 0xff; /* immediate value */ |
| 1719 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ |
| 1720 | int rd = bits (insn, 12, 15); |
| 1721 | imm = (imm >> rot) | (imm << (32 - rot)); |
| 1722 | regs[rd] = pv_add_constant (regs[bits (insn, 16, 19)], -imm); |
| 1723 | continue; |
| 1724 | } |
| 1725 | else if ((insn & 0xffff0fff) == 0xe52d0004) /* str Rd, |
| 1726 | [sp, #-4]! */ |
| 1727 | { |
| 1728 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
| 1729 | break; |
| 1730 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -4); |
| 1731 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, |
| 1732 | regs[bits (insn, 12, 15)]); |
| 1733 | continue; |
| 1734 | } |
| 1735 | else if ((insn & 0xffff0000) == 0xe92d0000) |
| 1736 | /* stmfd sp!, {..., fp, ip, lr, pc} |
| 1737 | or |
| 1738 | stmfd sp!, {a1, a2, a3, a4} */ |
| 1739 | { |
| 1740 | int mask = insn & 0xffff; |
| 1741 | |
| 1742 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
| 1743 | break; |
| 1744 | |
| 1745 | /* Calculate offsets of saved registers. */ |
| 1746 | for (regno = ARM_PC_REGNUM; regno >= 0; regno--) |
| 1747 | if (mask & (1 << regno)) |
| 1748 | { |
| 1749 | regs[ARM_SP_REGNUM] |
| 1750 | = pv_add_constant (regs[ARM_SP_REGNUM], -4); |
| 1751 | pv_area_store (stack, regs[ARM_SP_REGNUM], 4, regs[regno]); |
| 1752 | } |
| 1753 | } |
| 1754 | else if ((insn & 0xffff0000) == 0xe54b0000 /* strb rx,[r11,#-n] */ |
| 1755 | || (insn & 0xffff00f0) == 0xe14b00b0 /* strh rx,[r11,#-n] */ |
| 1756 | || (insn & 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */ |
| 1757 | { |
| 1758 | /* No need to add this to saved_regs -- it's just an arg reg. */ |
| 1759 | continue; |
| 1760 | } |
| 1761 | else if ((insn & 0xffff0000) == 0xe5cd0000 /* strb rx,[sp,#n] */ |
| 1762 | || (insn & 0xffff00f0) == 0xe1cd00b0 /* strh rx,[sp,#n] */ |
| 1763 | || (insn & 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */ |
| 1764 | { |
| 1765 | /* No need to add this to saved_regs -- it's just an arg reg. */ |
| 1766 | continue; |
| 1767 | } |
| 1768 | else if ((insn & 0xfff00000) == 0xe8800000 /* stm Rn, |
| 1769 | { registers } */ |
| 1770 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
| 1771 | { |
| 1772 | /* No need to add this to saved_regs -- it's just arg regs. */ |
| 1773 | continue; |
| 1774 | } |
| 1775 | else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */ |
| 1776 | { |
| 1777 | unsigned imm = insn & 0xff; /* immediate value */ |
| 1778 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ |
| 1779 | imm = (imm >> rot) | (imm << (32 - rot)); |
| 1780 | regs[ARM_FP_REGNUM] = pv_add_constant (regs[ARM_IP_REGNUM], -imm); |
| 1781 | } |
| 1782 | else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */ |
| 1783 | { |
| 1784 | unsigned imm = insn & 0xff; /* immediate value */ |
| 1785 | unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */ |
| 1786 | imm = (imm >> rot) | (imm << (32 - rot)); |
| 1787 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -imm); |
| 1788 | } |
| 1789 | else if ((insn & 0xffff7fff) == 0xed6d0103 /* stfe f?, |
| 1790 | [sp, -#c]! */ |
| 1791 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
| 1792 | { |
| 1793 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
| 1794 | break; |
| 1795 | |
| 1796 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); |
| 1797 | regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07); |
| 1798 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, regs[regno]); |
| 1799 | } |
| 1800 | else if ((insn & 0xffbf0fff) == 0xec2d0200 /* sfmfd f0, 4, |
| 1801 | [sp!] */ |
| 1802 | && gdbarch_tdep (gdbarch)->have_fpa_registers) |
| 1803 | { |
| 1804 | int n_saved_fp_regs; |
| 1805 | unsigned int fp_start_reg, fp_bound_reg; |
| 1806 | |
| 1807 | if (pv_area_store_would_trash (stack, regs[ARM_SP_REGNUM])) |
| 1808 | break; |
| 1809 | |
| 1810 | if ((insn & 0x800) == 0x800) /* N0 is set */ |
| 1811 | { |
| 1812 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
| 1813 | n_saved_fp_regs = 3; |
| 1814 | else |
| 1815 | n_saved_fp_regs = 1; |
| 1816 | } |
| 1817 | else |
| 1818 | { |
| 1819 | if ((insn & 0x40000) == 0x40000) /* N1 is set */ |
| 1820 | n_saved_fp_regs = 2; |
| 1821 | else |
| 1822 | n_saved_fp_regs = 4; |
| 1823 | } |
| 1824 | |
| 1825 | fp_start_reg = ARM_F0_REGNUM + ((insn >> 12) & 0x7); |
| 1826 | fp_bound_reg = fp_start_reg + n_saved_fp_regs; |
| 1827 | for (; fp_start_reg < fp_bound_reg; fp_start_reg++) |
| 1828 | { |
| 1829 | regs[ARM_SP_REGNUM] = pv_add_constant (regs[ARM_SP_REGNUM], -12); |
| 1830 | pv_area_store (stack, regs[ARM_SP_REGNUM], 12, |
| 1831 | regs[fp_start_reg++]); |
| 1832 | } |
| 1833 | } |
| 1834 | else if ((insn & 0xff000000) == 0xeb000000 && cache == NULL) /* bl */ |
| 1835 | { |
| 1836 | /* Allow some special function calls when skipping the |
| 1837 | prologue; GCC generates these before storing arguments to |
| 1838 | the stack. */ |
| 1839 | CORE_ADDR dest = BranchDest (current_pc, insn); |
| 1840 | |
| 1841 | if (skip_prologue_function (gdbarch, dest, 0)) |
| 1842 | continue; |
| 1843 | else |
| 1844 | break; |
| 1845 | } |
| 1846 | else if ((insn & 0xf0000000) != 0xe0000000) |
| 1847 | break; /* Condition not true, exit early. */ |
| 1848 | else if (arm_instruction_changes_pc (insn)) |
| 1849 | /* Don't scan past anything that might change control flow. */ |
| 1850 | break; |
| 1851 | else if ((insn & 0xfe500000) == 0xe8100000 /* ldm */ |
| 1852 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
| 1853 | /* Ignore block loads from the stack, potentially copying |
| 1854 | parameters from memory. */ |
| 1855 | continue; |
| 1856 | else if ((insn & 0xfc500000) == 0xe4100000 |
| 1857 | && pv_is_register (regs[bits (insn, 16, 19)], ARM_SP_REGNUM)) |
| 1858 | /* Similarly ignore single loads from the stack. */ |
| 1859 | continue; |
| 1860 | else if ((insn & 0xffff0ff0) == 0xe1a00000) |
| 1861 | /* MOV Rd, Rm. Skip register copies, i.e. saves to another |
| 1862 | register instead of the stack. */ |
| 1863 | continue; |
| 1864 | else |
| 1865 | { |
| 1866 | /* The optimizer might shove anything into the prologue, |
| 1867 | so we just skip what we don't recognize. */ |
| 1868 | unrecognized_pc = current_pc; |
| 1869 | continue; |
| 1870 | } |
| 1871 | } |
| 1872 | |
| 1873 | if (unrecognized_pc == 0) |
| 1874 | unrecognized_pc = current_pc; |
| 1875 | |
| 1876 | /* The frame size is just the distance from the frame register |
| 1877 | to the original stack pointer. */ |
| 1878 | if (pv_is_register (regs[ARM_FP_REGNUM], ARM_SP_REGNUM)) |
| 1879 | { |
| 1880 | /* Frame pointer is fp. */ |
| 1881 | framereg = ARM_FP_REGNUM; |
| 1882 | framesize = -regs[ARM_FP_REGNUM].k; |
| 1883 | } |
| 1884 | else |
| 1885 | { |
| 1886 | /* Try the stack pointer... this is a bit desperate. */ |
| 1887 | framereg = ARM_SP_REGNUM; |
| 1888 | framesize = -regs[ARM_SP_REGNUM].k; |
| 1889 | } |
| 1890 | |
| 1891 | if (cache) |
| 1892 | { |
| 1893 | cache->framereg = framereg; |
| 1894 | cache->framesize = framesize; |
| 1895 | |
| 1896 | for (regno = 0; regno < ARM_FPS_REGNUM; regno++) |
| 1897 | if (pv_area_find_reg (stack, gdbarch, regno, &offset)) |
| 1898 | cache->saved_regs[regno].addr = offset; |
| 1899 | } |
| 1900 | |
| 1901 | if (arm_debug) |
| 1902 | fprintf_unfiltered (gdb_stdlog, "Prologue scan stopped at %s\n", |
| 1903 | paddress (gdbarch, unrecognized_pc)); |
| 1904 | |
| 1905 | do_cleanups (back_to); |
| 1906 | return unrecognized_pc; |
| 1907 | } |
| 1908 | |
| 1909 | static void |
| 1910 | arm_scan_prologue (struct frame_info *this_frame, |
| 1911 | struct arm_prologue_cache *cache) |
| 1912 | { |
| 1913 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1914 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1915 | int regno; |
| 1916 | CORE_ADDR prologue_start, prologue_end, current_pc; |
| 1917 | CORE_ADDR prev_pc = get_frame_pc (this_frame); |
| 1918 | CORE_ADDR block_addr = get_frame_address_in_block (this_frame); |
| 1919 | pv_t regs[ARM_FPS_REGNUM]; |
| 1920 | struct pv_area *stack; |
| 1921 | struct cleanup *back_to; |
| 1922 | CORE_ADDR offset; |
| 1923 | |
| 1924 | /* Assume there is no frame until proven otherwise. */ |
| 1925 | cache->framereg = ARM_SP_REGNUM; |
| 1926 | cache->framesize = 0; |
| 1927 | |
| 1928 | /* Check for Thumb prologue. */ |
| 1929 | if (arm_frame_is_thumb (this_frame)) |
| 1930 | { |
| 1931 | thumb_scan_prologue (gdbarch, prev_pc, block_addr, cache); |
| 1932 | return; |
| 1933 | } |
| 1934 | |
| 1935 | /* Find the function prologue. If we can't find the function in |
| 1936 | the symbol table, peek in the stack frame to find the PC. */ |
| 1937 | if (find_pc_partial_function (block_addr, NULL, &prologue_start, |
| 1938 | &prologue_end)) |
| 1939 | { |
| 1940 | /* One way to find the end of the prologue (which works well |
| 1941 | for unoptimized code) is to do the following: |
| 1942 | |
| 1943 | struct symtab_and_line sal = find_pc_line (prologue_start, 0); |
| 1944 | |
| 1945 | if (sal.line == 0) |
| 1946 | prologue_end = prev_pc; |
| 1947 | else if (sal.end < prologue_end) |
| 1948 | prologue_end = sal.end; |
| 1949 | |
| 1950 | This mechanism is very accurate so long as the optimizer |
| 1951 | doesn't move any instructions from the function body into the |
| 1952 | prologue. If this happens, sal.end will be the last |
| 1953 | instruction in the first hunk of prologue code just before |
| 1954 | the first instruction that the scheduler has moved from |
| 1955 | the body to the prologue. |
| 1956 | |
| 1957 | In order to make sure that we scan all of the prologue |
| 1958 | instructions, we use a slightly less accurate mechanism which |
| 1959 | may scan more than necessary. To help compensate for this |
| 1960 | lack of accuracy, the prologue scanning loop below contains |
| 1961 | several clauses which'll cause the loop to terminate early if |
| 1962 | an implausible prologue instruction is encountered. |
| 1963 | |
| 1964 | The expression |
| 1965 | |
| 1966 | prologue_start + 64 |
| 1967 | |
| 1968 | is a suitable endpoint since it accounts for the largest |
| 1969 | possible prologue plus up to five instructions inserted by |
| 1970 | the scheduler. */ |
| 1971 | |
| 1972 | if (prologue_end > prologue_start + 64) |
| 1973 | { |
| 1974 | prologue_end = prologue_start + 64; /* See above. */ |
| 1975 | } |
| 1976 | } |
| 1977 | else |
| 1978 | { |
| 1979 | /* We have no symbol information. Our only option is to assume this |
| 1980 | function has a standard stack frame and the normal frame register. |
| 1981 | Then, we can find the value of our frame pointer on entrance to |
| 1982 | the callee (or at the present moment if this is the innermost frame). |
| 1983 | The value stored there should be the address of the stmfd + 8. */ |
| 1984 | CORE_ADDR frame_loc; |
| 1985 | LONGEST return_value; |
| 1986 | |
| 1987 | frame_loc = get_frame_register_unsigned (this_frame, ARM_FP_REGNUM); |
| 1988 | if (!safe_read_memory_integer (frame_loc, 4, byte_order, &return_value)) |
| 1989 | return; |
| 1990 | else |
| 1991 | { |
| 1992 | prologue_start = gdbarch_addr_bits_remove |
| 1993 | (gdbarch, return_value) - 8; |
| 1994 | prologue_end = prologue_start + 64; /* See above. */ |
| 1995 | } |
| 1996 | } |
| 1997 | |
| 1998 | if (prev_pc < prologue_end) |
| 1999 | prologue_end = prev_pc; |
| 2000 | |
| 2001 | arm_analyze_prologue (gdbarch, prologue_start, prologue_end, cache); |
| 2002 | } |
| 2003 | |
| 2004 | static struct arm_prologue_cache * |
| 2005 | arm_make_prologue_cache (struct frame_info *this_frame) |
| 2006 | { |
| 2007 | int reg; |
| 2008 | struct arm_prologue_cache *cache; |
| 2009 | CORE_ADDR unwound_fp; |
| 2010 | |
| 2011 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
| 2012 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 2013 | |
| 2014 | arm_scan_prologue (this_frame, cache); |
| 2015 | |
| 2016 | unwound_fp = get_frame_register_unsigned (this_frame, cache->framereg); |
| 2017 | if (unwound_fp == 0) |
| 2018 | return cache; |
| 2019 | |
| 2020 | cache->prev_sp = unwound_fp + cache->framesize; |
| 2021 | |
| 2022 | /* Calculate actual addresses of saved registers using offsets |
| 2023 | determined by arm_scan_prologue. */ |
| 2024 | for (reg = 0; reg < gdbarch_num_regs (get_frame_arch (this_frame)); reg++) |
| 2025 | if (trad_frame_addr_p (cache->saved_regs, reg)) |
| 2026 | cache->saved_regs[reg].addr += cache->prev_sp; |
| 2027 | |
| 2028 | return cache; |
| 2029 | } |
| 2030 | |
| 2031 | /* Our frame ID for a normal frame is the current function's starting PC |
| 2032 | and the caller's SP when we were called. */ |
| 2033 | |
| 2034 | static void |
| 2035 | arm_prologue_this_id (struct frame_info *this_frame, |
| 2036 | void **this_cache, |
| 2037 | struct frame_id *this_id) |
| 2038 | { |
| 2039 | struct arm_prologue_cache *cache; |
| 2040 | struct frame_id id; |
| 2041 | CORE_ADDR pc, func; |
| 2042 | |
| 2043 | if (*this_cache == NULL) |
| 2044 | *this_cache = arm_make_prologue_cache (this_frame); |
| 2045 | cache = *this_cache; |
| 2046 | |
| 2047 | /* This is meant to halt the backtrace at "_start". */ |
| 2048 | pc = get_frame_pc (this_frame); |
| 2049 | if (pc <= gdbarch_tdep (get_frame_arch (this_frame))->lowest_pc) |
| 2050 | return; |
| 2051 | |
| 2052 | /* If we've hit a wall, stop. */ |
| 2053 | if (cache->prev_sp == 0) |
| 2054 | return; |
| 2055 | |
| 2056 | /* Use function start address as part of the frame ID. If we cannot |
| 2057 | identify the start address (due to missing symbol information), |
| 2058 | fall back to just using the current PC. */ |
| 2059 | func = get_frame_func (this_frame); |
| 2060 | if (!func) |
| 2061 | func = pc; |
| 2062 | |
| 2063 | id = frame_id_build (cache->prev_sp, func); |
| 2064 | *this_id = id; |
| 2065 | } |
| 2066 | |
| 2067 | static struct value * |
| 2068 | arm_prologue_prev_register (struct frame_info *this_frame, |
| 2069 | void **this_cache, |
| 2070 | int prev_regnum) |
| 2071 | { |
| 2072 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 2073 | struct arm_prologue_cache *cache; |
| 2074 | |
| 2075 | if (*this_cache == NULL) |
| 2076 | *this_cache = arm_make_prologue_cache (this_frame); |
| 2077 | cache = *this_cache; |
| 2078 | |
| 2079 | /* If we are asked to unwind the PC, then we need to return the LR |
| 2080 | instead. The prologue may save PC, but it will point into this |
| 2081 | frame's prologue, not the next frame's resume location. Also |
| 2082 | strip the saved T bit. A valid LR may have the low bit set, but |
| 2083 | a valid PC never does. */ |
| 2084 | if (prev_regnum == ARM_PC_REGNUM) |
| 2085 | { |
| 2086 | CORE_ADDR lr; |
| 2087 | |
| 2088 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
| 2089 | return frame_unwind_got_constant (this_frame, prev_regnum, |
| 2090 | arm_addr_bits_remove (gdbarch, lr)); |
| 2091 | } |
| 2092 | |
| 2093 | /* SP is generally not saved to the stack, but this frame is |
| 2094 | identified by the next frame's stack pointer at the time of the call. |
| 2095 | The value was already reconstructed into PREV_SP. */ |
| 2096 | if (prev_regnum == ARM_SP_REGNUM) |
| 2097 | return frame_unwind_got_constant (this_frame, prev_regnum, cache->prev_sp); |
| 2098 | |
| 2099 | /* The CPSR may have been changed by the call instruction and by the |
| 2100 | called function. The only bit we can reconstruct is the T bit, |
| 2101 | by checking the low bit of LR as of the call. This is a reliable |
| 2102 | indicator of Thumb-ness except for some ARM v4T pre-interworking |
| 2103 | Thumb code, which could get away with a clear low bit as long as |
| 2104 | the called function did not use bx. Guess that all other |
| 2105 | bits are unchanged; the condition flags are presumably lost, |
| 2106 | but the processor status is likely valid. */ |
| 2107 | if (prev_regnum == ARM_PS_REGNUM) |
| 2108 | { |
| 2109 | CORE_ADDR lr, cpsr; |
| 2110 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
| 2111 | |
| 2112 | cpsr = get_frame_register_unsigned (this_frame, prev_regnum); |
| 2113 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
| 2114 | if (IS_THUMB_ADDR (lr)) |
| 2115 | cpsr |= t_bit; |
| 2116 | else |
| 2117 | cpsr &= ~t_bit; |
| 2118 | return frame_unwind_got_constant (this_frame, prev_regnum, cpsr); |
| 2119 | } |
| 2120 | |
| 2121 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, |
| 2122 | prev_regnum); |
| 2123 | } |
| 2124 | |
| 2125 | struct frame_unwind arm_prologue_unwind = { |
| 2126 | NORMAL_FRAME, |
| 2127 | default_frame_unwind_stop_reason, |
| 2128 | arm_prologue_this_id, |
| 2129 | arm_prologue_prev_register, |
| 2130 | NULL, |
| 2131 | default_frame_sniffer |
| 2132 | }; |
| 2133 | |
| 2134 | /* Maintain a list of ARM exception table entries per objfile, similar to the |
| 2135 | list of mapping symbols. We only cache entries for standard ARM-defined |
| 2136 | personality routines; the cache will contain only the frame unwinding |
| 2137 | instructions associated with the entry (not the descriptors). */ |
| 2138 | |
| 2139 | static const struct objfile_data *arm_exidx_data_key; |
| 2140 | |
| 2141 | struct arm_exidx_entry |
| 2142 | { |
| 2143 | bfd_vma addr; |
| 2144 | gdb_byte *entry; |
| 2145 | }; |
| 2146 | typedef struct arm_exidx_entry arm_exidx_entry_s; |
| 2147 | DEF_VEC_O(arm_exidx_entry_s); |
| 2148 | |
| 2149 | struct arm_exidx_data |
| 2150 | { |
| 2151 | VEC(arm_exidx_entry_s) **section_maps; |
| 2152 | }; |
| 2153 | |
| 2154 | static void |
| 2155 | arm_exidx_data_free (struct objfile *objfile, void *arg) |
| 2156 | { |
| 2157 | struct arm_exidx_data *data = arg; |
| 2158 | unsigned int i; |
| 2159 | |
| 2160 | for (i = 0; i < objfile->obfd->section_count; i++) |
| 2161 | VEC_free (arm_exidx_entry_s, data->section_maps[i]); |
| 2162 | } |
| 2163 | |
| 2164 | static inline int |
| 2165 | arm_compare_exidx_entries (const struct arm_exidx_entry *lhs, |
| 2166 | const struct arm_exidx_entry *rhs) |
| 2167 | { |
| 2168 | return lhs->addr < rhs->addr; |
| 2169 | } |
| 2170 | |
| 2171 | static struct obj_section * |
| 2172 | arm_obj_section_from_vma (struct objfile *objfile, bfd_vma vma) |
| 2173 | { |
| 2174 | struct obj_section *osect; |
| 2175 | |
| 2176 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 2177 | if (bfd_get_section_flags (objfile->obfd, |
| 2178 | osect->the_bfd_section) & SEC_ALLOC) |
| 2179 | { |
| 2180 | bfd_vma start, size; |
| 2181 | start = bfd_get_section_vma (objfile->obfd, osect->the_bfd_section); |
| 2182 | size = bfd_get_section_size (osect->the_bfd_section); |
| 2183 | |
| 2184 | if (start <= vma && vma < start + size) |
| 2185 | return osect; |
| 2186 | } |
| 2187 | |
| 2188 | return NULL; |
| 2189 | } |
| 2190 | |
| 2191 | /* Parse contents of exception table and exception index sections |
| 2192 | of OBJFILE, and fill in the exception table entry cache. |
| 2193 | |
| 2194 | For each entry that refers to a standard ARM-defined personality |
| 2195 | routine, extract the frame unwinding instructions (from either |
| 2196 | the index or the table section). The unwinding instructions |
| 2197 | are normalized by: |
| 2198 | - extracting them from the rest of the table data |
| 2199 | - converting to host endianness |
| 2200 | - appending the implicit 0xb0 ("Finish") code |
| 2201 | |
| 2202 | The extracted and normalized instructions are stored for later |
| 2203 | retrieval by the arm_find_exidx_entry routine. */ |
| 2204 | |
| 2205 | static void |
| 2206 | arm_exidx_new_objfile (struct objfile *objfile) |
| 2207 | { |
| 2208 | struct cleanup *cleanups; |
| 2209 | struct arm_exidx_data *data; |
| 2210 | asection *exidx, *extab; |
| 2211 | bfd_vma exidx_vma = 0, extab_vma = 0; |
| 2212 | bfd_size_type exidx_size = 0, extab_size = 0; |
| 2213 | gdb_byte *exidx_data = NULL, *extab_data = NULL; |
| 2214 | LONGEST i; |
| 2215 | |
| 2216 | /* If we've already touched this file, do nothing. */ |
| 2217 | if (!objfile || objfile_data (objfile, arm_exidx_data_key) != NULL) |
| 2218 | return; |
| 2219 | cleanups = make_cleanup (null_cleanup, NULL); |
| 2220 | |
| 2221 | /* Read contents of exception table and index. */ |
| 2222 | exidx = bfd_get_section_by_name (objfile->obfd, ".ARM.exidx"); |
| 2223 | if (exidx) |
| 2224 | { |
| 2225 | exidx_vma = bfd_section_vma (objfile->obfd, exidx); |
| 2226 | exidx_size = bfd_get_section_size (exidx); |
| 2227 | exidx_data = xmalloc (exidx_size); |
| 2228 | make_cleanup (xfree, exidx_data); |
| 2229 | |
| 2230 | if (!bfd_get_section_contents (objfile->obfd, exidx, |
| 2231 | exidx_data, 0, exidx_size)) |
| 2232 | { |
| 2233 | do_cleanups (cleanups); |
| 2234 | return; |
| 2235 | } |
| 2236 | } |
| 2237 | |
| 2238 | extab = bfd_get_section_by_name (objfile->obfd, ".ARM.extab"); |
| 2239 | if (extab) |
| 2240 | { |
| 2241 | extab_vma = bfd_section_vma (objfile->obfd, extab); |
| 2242 | extab_size = bfd_get_section_size (extab); |
| 2243 | extab_data = xmalloc (extab_size); |
| 2244 | make_cleanup (xfree, extab_data); |
| 2245 | |
| 2246 | if (!bfd_get_section_contents (objfile->obfd, extab, |
| 2247 | extab_data, 0, extab_size)) |
| 2248 | { |
| 2249 | do_cleanups (cleanups); |
| 2250 | return; |
| 2251 | } |
| 2252 | } |
| 2253 | |
| 2254 | /* Allocate exception table data structure. */ |
| 2255 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct arm_exidx_data); |
| 2256 | set_objfile_data (objfile, arm_exidx_data_key, data); |
| 2257 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, |
| 2258 | objfile->obfd->section_count, |
| 2259 | VEC(arm_exidx_entry_s) *); |
| 2260 | |
| 2261 | /* Fill in exception table. */ |
| 2262 | for (i = 0; i < exidx_size / 8; i++) |
| 2263 | { |
| 2264 | struct arm_exidx_entry new_exidx_entry; |
| 2265 | bfd_vma idx = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8); |
| 2266 | bfd_vma val = bfd_h_get_32 (objfile->obfd, exidx_data + i * 8 + 4); |
| 2267 | bfd_vma addr = 0, word = 0; |
| 2268 | int n_bytes = 0, n_words = 0; |
| 2269 | struct obj_section *sec; |
| 2270 | gdb_byte *entry = NULL; |
| 2271 | |
| 2272 | /* Extract address of start of function. */ |
| 2273 | idx = ((idx & 0x7fffffff) ^ 0x40000000) - 0x40000000; |
| 2274 | idx += exidx_vma + i * 8; |
| 2275 | |
| 2276 | /* Find section containing function and compute section offset. */ |
| 2277 | sec = arm_obj_section_from_vma (objfile, idx); |
| 2278 | if (sec == NULL) |
| 2279 | continue; |
| 2280 | idx -= bfd_get_section_vma (objfile->obfd, sec->the_bfd_section); |
| 2281 | |
| 2282 | /* Determine address of exception table entry. */ |
| 2283 | if (val == 1) |
| 2284 | { |
| 2285 | /* EXIDX_CANTUNWIND -- no exception table entry present. */ |
| 2286 | } |
| 2287 | else if ((val & 0xff000000) == 0x80000000) |
| 2288 | { |
| 2289 | /* Exception table entry embedded in .ARM.exidx |
| 2290 | -- must be short form. */ |
| 2291 | word = val; |
| 2292 | n_bytes = 3; |
| 2293 | } |
| 2294 | else if (!(val & 0x80000000)) |
| 2295 | { |
| 2296 | /* Exception table entry in .ARM.extab. */ |
| 2297 | addr = ((val & 0x7fffffff) ^ 0x40000000) - 0x40000000; |
| 2298 | addr += exidx_vma + i * 8 + 4; |
| 2299 | |
| 2300 | if (addr >= extab_vma && addr + 4 <= extab_vma + extab_size) |
| 2301 | { |
| 2302 | word = bfd_h_get_32 (objfile->obfd, |
| 2303 | extab_data + addr - extab_vma); |
| 2304 | addr += 4; |
| 2305 | |
| 2306 | if ((word & 0xff000000) == 0x80000000) |
| 2307 | { |
| 2308 | /* Short form. */ |
| 2309 | n_bytes = 3; |
| 2310 | } |
| 2311 | else if ((word & 0xff000000) == 0x81000000 |
| 2312 | || (word & 0xff000000) == 0x82000000) |
| 2313 | { |
| 2314 | /* Long form. */ |
| 2315 | n_bytes = 2; |
| 2316 | n_words = ((word >> 16) & 0xff); |
| 2317 | } |
| 2318 | else if (!(word & 0x80000000)) |
| 2319 | { |
| 2320 | bfd_vma pers; |
| 2321 | struct obj_section *pers_sec; |
| 2322 | int gnu_personality = 0; |
| 2323 | |
| 2324 | /* Custom personality routine. */ |
| 2325 | pers = ((word & 0x7fffffff) ^ 0x40000000) - 0x40000000; |
| 2326 | pers = UNMAKE_THUMB_ADDR (pers + addr - 4); |
| 2327 | |
| 2328 | /* Check whether we've got one of the variants of the |
| 2329 | GNU personality routines. */ |
| 2330 | pers_sec = arm_obj_section_from_vma (objfile, pers); |
| 2331 | if (pers_sec) |
| 2332 | { |
| 2333 | static const char *personality[] = |
| 2334 | { |
| 2335 | "__gcc_personality_v0", |
| 2336 | "__gxx_personality_v0", |
| 2337 | "__gcj_personality_v0", |
| 2338 | "__gnu_objc_personality_v0", |
| 2339 | NULL |
| 2340 | }; |
| 2341 | |
| 2342 | CORE_ADDR pc = pers + obj_section_offset (pers_sec); |
| 2343 | int k; |
| 2344 | |
| 2345 | for (k = 0; personality[k]; k++) |
| 2346 | if (lookup_minimal_symbol_by_pc_name |
| 2347 | (pc, personality[k], objfile)) |
| 2348 | { |
| 2349 | gnu_personality = 1; |
| 2350 | break; |
| 2351 | } |
| 2352 | } |
| 2353 | |
| 2354 | /* If so, the next word contains a word count in the high |
| 2355 | byte, followed by the same unwind instructions as the |
| 2356 | pre-defined forms. */ |
| 2357 | if (gnu_personality |
| 2358 | && addr + 4 <= extab_vma + extab_size) |
| 2359 | { |
| 2360 | word = bfd_h_get_32 (objfile->obfd, |
| 2361 | extab_data + addr - extab_vma); |
| 2362 | addr += 4; |
| 2363 | n_bytes = 3; |
| 2364 | n_words = ((word >> 24) & 0xff); |
| 2365 | } |
| 2366 | } |
| 2367 | } |
| 2368 | } |
| 2369 | |
| 2370 | /* Sanity check address. */ |
| 2371 | if (n_words) |
| 2372 | if (addr < extab_vma || addr + 4 * n_words > extab_vma + extab_size) |
| 2373 | n_words = n_bytes = 0; |
| 2374 | |
| 2375 | /* The unwind instructions reside in WORD (only the N_BYTES least |
| 2376 | significant bytes are valid), followed by N_WORDS words in the |
| 2377 | extab section starting at ADDR. */ |
| 2378 | if (n_bytes || n_words) |
| 2379 | { |
| 2380 | gdb_byte *p = entry = obstack_alloc (&objfile->objfile_obstack, |
| 2381 | n_bytes + n_words * 4 + 1); |
| 2382 | |
| 2383 | while (n_bytes--) |
| 2384 | *p++ = (gdb_byte) ((word >> (8 * n_bytes)) & 0xff); |
| 2385 | |
| 2386 | while (n_words--) |
| 2387 | { |
| 2388 | word = bfd_h_get_32 (objfile->obfd, |
| 2389 | extab_data + addr - extab_vma); |
| 2390 | addr += 4; |
| 2391 | |
| 2392 | *p++ = (gdb_byte) ((word >> 24) & 0xff); |
| 2393 | *p++ = (gdb_byte) ((word >> 16) & 0xff); |
| 2394 | *p++ = (gdb_byte) ((word >> 8) & 0xff); |
| 2395 | *p++ = (gdb_byte) (word & 0xff); |
| 2396 | } |
| 2397 | |
| 2398 | /* Implied "Finish" to terminate the list. */ |
| 2399 | *p++ = 0xb0; |
| 2400 | } |
| 2401 | |
| 2402 | /* Push entry onto vector. They are guaranteed to always |
| 2403 | appear in order of increasing addresses. */ |
| 2404 | new_exidx_entry.addr = idx; |
| 2405 | new_exidx_entry.entry = entry; |
| 2406 | VEC_safe_push (arm_exidx_entry_s, |
| 2407 | data->section_maps[sec->the_bfd_section->index], |
| 2408 | &new_exidx_entry); |
| 2409 | } |
| 2410 | |
| 2411 | do_cleanups (cleanups); |
| 2412 | } |
| 2413 | |
| 2414 | /* Search for the exception table entry covering MEMADDR. If one is found, |
| 2415 | return a pointer to its data. Otherwise, return 0. If START is non-NULL, |
| 2416 | set *START to the start of the region covered by this entry. */ |
| 2417 | |
| 2418 | static gdb_byte * |
| 2419 | arm_find_exidx_entry (CORE_ADDR memaddr, CORE_ADDR *start) |
| 2420 | { |
| 2421 | struct obj_section *sec; |
| 2422 | |
| 2423 | sec = find_pc_section (memaddr); |
| 2424 | if (sec != NULL) |
| 2425 | { |
| 2426 | struct arm_exidx_data *data; |
| 2427 | VEC(arm_exidx_entry_s) *map; |
| 2428 | struct arm_exidx_entry map_key = { memaddr - obj_section_addr (sec), 0 }; |
| 2429 | unsigned int idx; |
| 2430 | |
| 2431 | data = objfile_data (sec->objfile, arm_exidx_data_key); |
| 2432 | if (data != NULL) |
| 2433 | { |
| 2434 | map = data->section_maps[sec->the_bfd_section->index]; |
| 2435 | if (!VEC_empty (arm_exidx_entry_s, map)) |
| 2436 | { |
| 2437 | struct arm_exidx_entry *map_sym; |
| 2438 | |
| 2439 | idx = VEC_lower_bound (arm_exidx_entry_s, map, &map_key, |
| 2440 | arm_compare_exidx_entries); |
| 2441 | |
| 2442 | /* VEC_lower_bound finds the earliest ordered insertion |
| 2443 | point. If the following symbol starts at this exact |
| 2444 | address, we use that; otherwise, the preceding |
| 2445 | exception table entry covers this address. */ |
| 2446 | if (idx < VEC_length (arm_exidx_entry_s, map)) |
| 2447 | { |
| 2448 | map_sym = VEC_index (arm_exidx_entry_s, map, idx); |
| 2449 | if (map_sym->addr == map_key.addr) |
| 2450 | { |
| 2451 | if (start) |
| 2452 | *start = map_sym->addr + obj_section_addr (sec); |
| 2453 | return map_sym->entry; |
| 2454 | } |
| 2455 | } |
| 2456 | |
| 2457 | if (idx > 0) |
| 2458 | { |
| 2459 | map_sym = VEC_index (arm_exidx_entry_s, map, idx - 1); |
| 2460 | if (start) |
| 2461 | *start = map_sym->addr + obj_section_addr (sec); |
| 2462 | return map_sym->entry; |
| 2463 | } |
| 2464 | } |
| 2465 | } |
| 2466 | } |
| 2467 | |
| 2468 | return NULL; |
| 2469 | } |
| 2470 | |
| 2471 | /* Given the current frame THIS_FRAME, and its associated frame unwinding |
| 2472 | instruction list from the ARM exception table entry ENTRY, allocate and |
| 2473 | return a prologue cache structure describing how to unwind this frame. |
| 2474 | |
| 2475 | Return NULL if the unwinding instruction list contains a "spare", |
| 2476 | "reserved" or "refuse to unwind" instruction as defined in section |
| 2477 | "9.3 Frame unwinding instructions" of the "Exception Handling ABI |
| 2478 | for the ARM Architecture" document. */ |
| 2479 | |
| 2480 | static struct arm_prologue_cache * |
| 2481 | arm_exidx_fill_cache (struct frame_info *this_frame, gdb_byte *entry) |
| 2482 | { |
| 2483 | CORE_ADDR vsp = 0; |
| 2484 | int vsp_valid = 0; |
| 2485 | |
| 2486 | struct arm_prologue_cache *cache; |
| 2487 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
| 2488 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 2489 | |
| 2490 | for (;;) |
| 2491 | { |
| 2492 | gdb_byte insn; |
| 2493 | |
| 2494 | /* Whenever we reload SP, we actually have to retrieve its |
| 2495 | actual value in the current frame. */ |
| 2496 | if (!vsp_valid) |
| 2497 | { |
| 2498 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) |
| 2499 | { |
| 2500 | int reg = cache->saved_regs[ARM_SP_REGNUM].realreg; |
| 2501 | vsp = get_frame_register_unsigned (this_frame, reg); |
| 2502 | } |
| 2503 | else |
| 2504 | { |
| 2505 | CORE_ADDR addr = cache->saved_regs[ARM_SP_REGNUM].addr; |
| 2506 | vsp = get_frame_memory_unsigned (this_frame, addr, 4); |
| 2507 | } |
| 2508 | |
| 2509 | vsp_valid = 1; |
| 2510 | } |
| 2511 | |
| 2512 | /* Decode next unwind instruction. */ |
| 2513 | insn = *entry++; |
| 2514 | |
| 2515 | if ((insn & 0xc0) == 0) |
| 2516 | { |
| 2517 | int offset = insn & 0x3f; |
| 2518 | vsp += (offset << 2) + 4; |
| 2519 | } |
| 2520 | else if ((insn & 0xc0) == 0x40) |
| 2521 | { |
| 2522 | int offset = insn & 0x3f; |
| 2523 | vsp -= (offset << 2) + 4; |
| 2524 | } |
| 2525 | else if ((insn & 0xf0) == 0x80) |
| 2526 | { |
| 2527 | int mask = ((insn & 0xf) << 8) | *entry++; |
| 2528 | int i; |
| 2529 | |
| 2530 | /* The special case of an all-zero mask identifies |
| 2531 | "Refuse to unwind". We return NULL to fall back |
| 2532 | to the prologue analyzer. */ |
| 2533 | if (mask == 0) |
| 2534 | return NULL; |
| 2535 | |
| 2536 | /* Pop registers r4..r15 under mask. */ |
| 2537 | for (i = 0; i < 12; i++) |
| 2538 | if (mask & (1 << i)) |
| 2539 | { |
| 2540 | cache->saved_regs[4 + i].addr = vsp; |
| 2541 | vsp += 4; |
| 2542 | } |
| 2543 | |
| 2544 | /* Special-case popping SP -- we need to reload vsp. */ |
| 2545 | if (mask & (1 << (ARM_SP_REGNUM - 4))) |
| 2546 | vsp_valid = 0; |
| 2547 | } |
| 2548 | else if ((insn & 0xf0) == 0x90) |
| 2549 | { |
| 2550 | int reg = insn & 0xf; |
| 2551 | |
| 2552 | /* Reserved cases. */ |
| 2553 | if (reg == ARM_SP_REGNUM || reg == ARM_PC_REGNUM) |
| 2554 | return NULL; |
| 2555 | |
| 2556 | /* Set SP from another register and mark VSP for reload. */ |
| 2557 | cache->saved_regs[ARM_SP_REGNUM] = cache->saved_regs[reg]; |
| 2558 | vsp_valid = 0; |
| 2559 | } |
| 2560 | else if ((insn & 0xf0) == 0xa0) |
| 2561 | { |
| 2562 | int count = insn & 0x7; |
| 2563 | int pop_lr = (insn & 0x8) != 0; |
| 2564 | int i; |
| 2565 | |
| 2566 | /* Pop r4..r[4+count]. */ |
| 2567 | for (i = 0; i <= count; i++) |
| 2568 | { |
| 2569 | cache->saved_regs[4 + i].addr = vsp; |
| 2570 | vsp += 4; |
| 2571 | } |
| 2572 | |
| 2573 | /* If indicated by flag, pop LR as well. */ |
| 2574 | if (pop_lr) |
| 2575 | { |
| 2576 | cache->saved_regs[ARM_LR_REGNUM].addr = vsp; |
| 2577 | vsp += 4; |
| 2578 | } |
| 2579 | } |
| 2580 | else if (insn == 0xb0) |
| 2581 | { |
| 2582 | /* We could only have updated PC by popping into it; if so, it |
| 2583 | will show up as address. Otherwise, copy LR into PC. */ |
| 2584 | if (!trad_frame_addr_p (cache->saved_regs, ARM_PC_REGNUM)) |
| 2585 | cache->saved_regs[ARM_PC_REGNUM] |
| 2586 | = cache->saved_regs[ARM_LR_REGNUM]; |
| 2587 | |
| 2588 | /* We're done. */ |
| 2589 | break; |
| 2590 | } |
| 2591 | else if (insn == 0xb1) |
| 2592 | { |
| 2593 | int mask = *entry++; |
| 2594 | int i; |
| 2595 | |
| 2596 | /* All-zero mask and mask >= 16 is "spare". */ |
| 2597 | if (mask == 0 || mask >= 16) |
| 2598 | return NULL; |
| 2599 | |
| 2600 | /* Pop r0..r3 under mask. */ |
| 2601 | for (i = 0; i < 4; i++) |
| 2602 | if (mask & (1 << i)) |
| 2603 | { |
| 2604 | cache->saved_regs[i].addr = vsp; |
| 2605 | vsp += 4; |
| 2606 | } |
| 2607 | } |
| 2608 | else if (insn == 0xb2) |
| 2609 | { |
| 2610 | ULONGEST offset = 0; |
| 2611 | unsigned shift = 0; |
| 2612 | |
| 2613 | do |
| 2614 | { |
| 2615 | offset |= (*entry & 0x7f) << shift; |
| 2616 | shift += 7; |
| 2617 | } |
| 2618 | while (*entry++ & 0x80); |
| 2619 | |
| 2620 | vsp += 0x204 + (offset << 2); |
| 2621 | } |
| 2622 | else if (insn == 0xb3) |
| 2623 | { |
| 2624 | int start = *entry >> 4; |
| 2625 | int count = (*entry++) & 0xf; |
| 2626 | int i; |
| 2627 | |
| 2628 | /* Only registers D0..D15 are valid here. */ |
| 2629 | if (start + count >= 16) |
| 2630 | return NULL; |
| 2631 | |
| 2632 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ |
| 2633 | for (i = 0; i <= count; i++) |
| 2634 | { |
| 2635 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; |
| 2636 | vsp += 8; |
| 2637 | } |
| 2638 | |
| 2639 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ |
| 2640 | vsp += 4; |
| 2641 | } |
| 2642 | else if ((insn & 0xf8) == 0xb8) |
| 2643 | { |
| 2644 | int count = insn & 0x7; |
| 2645 | int i; |
| 2646 | |
| 2647 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ |
| 2648 | for (i = 0; i <= count; i++) |
| 2649 | { |
| 2650 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; |
| 2651 | vsp += 8; |
| 2652 | } |
| 2653 | |
| 2654 | /* Add an extra 4 bytes for FSTMFDX-style stack. */ |
| 2655 | vsp += 4; |
| 2656 | } |
| 2657 | else if (insn == 0xc6) |
| 2658 | { |
| 2659 | int start = *entry >> 4; |
| 2660 | int count = (*entry++) & 0xf; |
| 2661 | int i; |
| 2662 | |
| 2663 | /* Only registers WR0..WR15 are valid. */ |
| 2664 | if (start + count >= 16) |
| 2665 | return NULL; |
| 2666 | |
| 2667 | /* Pop iwmmx registers WR[start]..WR[start+count]. */ |
| 2668 | for (i = 0; i <= count; i++) |
| 2669 | { |
| 2670 | cache->saved_regs[ARM_WR0_REGNUM + start + i].addr = vsp; |
| 2671 | vsp += 8; |
| 2672 | } |
| 2673 | } |
| 2674 | else if (insn == 0xc7) |
| 2675 | { |
| 2676 | int mask = *entry++; |
| 2677 | int i; |
| 2678 | |
| 2679 | /* All-zero mask and mask >= 16 is "spare". */ |
| 2680 | if (mask == 0 || mask >= 16) |
| 2681 | return NULL; |
| 2682 | |
| 2683 | /* Pop iwmmx general-purpose registers WCGR0..WCGR3 under mask. */ |
| 2684 | for (i = 0; i < 4; i++) |
| 2685 | if (mask & (1 << i)) |
| 2686 | { |
| 2687 | cache->saved_regs[ARM_WCGR0_REGNUM + i].addr = vsp; |
| 2688 | vsp += 4; |
| 2689 | } |
| 2690 | } |
| 2691 | else if ((insn & 0xf8) == 0xc0) |
| 2692 | { |
| 2693 | int count = insn & 0x7; |
| 2694 | int i; |
| 2695 | |
| 2696 | /* Pop iwmmx registers WR[10]..WR[10+count]. */ |
| 2697 | for (i = 0; i <= count; i++) |
| 2698 | { |
| 2699 | cache->saved_regs[ARM_WR0_REGNUM + 10 + i].addr = vsp; |
| 2700 | vsp += 8; |
| 2701 | } |
| 2702 | } |
| 2703 | else if (insn == 0xc8) |
| 2704 | { |
| 2705 | int start = *entry >> 4; |
| 2706 | int count = (*entry++) & 0xf; |
| 2707 | int i; |
| 2708 | |
| 2709 | /* Only registers D0..D31 are valid. */ |
| 2710 | if (start + count >= 16) |
| 2711 | return NULL; |
| 2712 | |
| 2713 | /* Pop VFP double-precision registers |
| 2714 | D[16+start]..D[16+start+count]. */ |
| 2715 | for (i = 0; i <= count; i++) |
| 2716 | { |
| 2717 | cache->saved_regs[ARM_D0_REGNUM + 16 + start + i].addr = vsp; |
| 2718 | vsp += 8; |
| 2719 | } |
| 2720 | } |
| 2721 | else if (insn == 0xc9) |
| 2722 | { |
| 2723 | int start = *entry >> 4; |
| 2724 | int count = (*entry++) & 0xf; |
| 2725 | int i; |
| 2726 | |
| 2727 | /* Pop VFP double-precision registers D[start]..D[start+count]. */ |
| 2728 | for (i = 0; i <= count; i++) |
| 2729 | { |
| 2730 | cache->saved_regs[ARM_D0_REGNUM + start + i].addr = vsp; |
| 2731 | vsp += 8; |
| 2732 | } |
| 2733 | } |
| 2734 | else if ((insn & 0xf8) == 0xd0) |
| 2735 | { |
| 2736 | int count = insn & 0x7; |
| 2737 | int i; |
| 2738 | |
| 2739 | /* Pop VFP double-precision registers D[8]..D[8+count]. */ |
| 2740 | for (i = 0; i <= count; i++) |
| 2741 | { |
| 2742 | cache->saved_regs[ARM_D0_REGNUM + 8 + i].addr = vsp; |
| 2743 | vsp += 8; |
| 2744 | } |
| 2745 | } |
| 2746 | else |
| 2747 | { |
| 2748 | /* Everything else is "spare". */ |
| 2749 | return NULL; |
| 2750 | } |
| 2751 | } |
| 2752 | |
| 2753 | /* If we restore SP from a register, assume this was the frame register. |
| 2754 | Otherwise just fall back to SP as frame register. */ |
| 2755 | if (trad_frame_realreg_p (cache->saved_regs, ARM_SP_REGNUM)) |
| 2756 | cache->framereg = cache->saved_regs[ARM_SP_REGNUM].realreg; |
| 2757 | else |
| 2758 | cache->framereg = ARM_SP_REGNUM; |
| 2759 | |
| 2760 | /* Determine offset to previous frame. */ |
| 2761 | cache->framesize |
| 2762 | = vsp - get_frame_register_unsigned (this_frame, cache->framereg); |
| 2763 | |
| 2764 | /* We already got the previous SP. */ |
| 2765 | cache->prev_sp = vsp; |
| 2766 | |
| 2767 | return cache; |
| 2768 | } |
| 2769 | |
| 2770 | /* Unwinding via ARM exception table entries. Note that the sniffer |
| 2771 | already computes a filled-in prologue cache, which is then used |
| 2772 | with the same arm_prologue_this_id and arm_prologue_prev_register |
| 2773 | routines also used for prologue-parsing based unwinding. */ |
| 2774 | |
| 2775 | static int |
| 2776 | arm_exidx_unwind_sniffer (const struct frame_unwind *self, |
| 2777 | struct frame_info *this_frame, |
| 2778 | void **this_prologue_cache) |
| 2779 | { |
| 2780 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 2781 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 2782 | CORE_ADDR addr_in_block, exidx_region, func_start; |
| 2783 | struct arm_prologue_cache *cache; |
| 2784 | gdb_byte *entry; |
| 2785 | |
| 2786 | /* See if we have an ARM exception table entry covering this address. */ |
| 2787 | addr_in_block = get_frame_address_in_block (this_frame); |
| 2788 | entry = arm_find_exidx_entry (addr_in_block, &exidx_region); |
| 2789 | if (!entry) |
| 2790 | return 0; |
| 2791 | |
| 2792 | /* The ARM exception table does not describe unwind information |
| 2793 | for arbitrary PC values, but is guaranteed to be correct only |
| 2794 | at call sites. We have to decide here whether we want to use |
| 2795 | ARM exception table information for this frame, or fall back |
| 2796 | to using prologue parsing. (Note that if we have DWARF CFI, |
| 2797 | this sniffer isn't even called -- CFI is always preferred.) |
| 2798 | |
| 2799 | Before we make this decision, however, we check whether we |
| 2800 | actually have *symbol* information for the current frame. |
| 2801 | If not, prologue parsing would not work anyway, so we might |
| 2802 | as well use the exception table and hope for the best. */ |
| 2803 | if (find_pc_partial_function (addr_in_block, NULL, &func_start, NULL)) |
| 2804 | { |
| 2805 | int exc_valid = 0; |
| 2806 | |
| 2807 | /* If the next frame is "normal", we are at a call site in this |
| 2808 | frame, so exception information is guaranteed to be valid. */ |
| 2809 | if (get_next_frame (this_frame) |
| 2810 | && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) |
| 2811 | exc_valid = 1; |
| 2812 | |
| 2813 | /* We also assume exception information is valid if we're currently |
| 2814 | blocked in a system call. The system library is supposed to |
| 2815 | ensure this, so that e.g. pthread cancellation works. */ |
| 2816 | if (arm_frame_is_thumb (this_frame)) |
| 2817 | { |
| 2818 | LONGEST insn; |
| 2819 | |
| 2820 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 2, 2, |
| 2821 | byte_order_for_code, &insn) |
| 2822 | && (insn & 0xff00) == 0xdf00 /* svc */) |
| 2823 | exc_valid = 1; |
| 2824 | } |
| 2825 | else |
| 2826 | { |
| 2827 | LONGEST insn; |
| 2828 | |
| 2829 | if (safe_read_memory_integer (get_frame_pc (this_frame) - 4, 4, |
| 2830 | byte_order_for_code, &insn) |
| 2831 | && (insn & 0x0f000000) == 0x0f000000 /* svc */) |
| 2832 | exc_valid = 1; |
| 2833 | } |
| 2834 | |
| 2835 | /* Bail out if we don't know that exception information is valid. */ |
| 2836 | if (!exc_valid) |
| 2837 | return 0; |
| 2838 | |
| 2839 | /* The ARM exception index does not mark the *end* of the region |
| 2840 | covered by the entry, and some functions will not have any entry. |
| 2841 | To correctly recognize the end of the covered region, the linker |
| 2842 | should have inserted dummy records with a CANTUNWIND marker. |
| 2843 | |
| 2844 | Unfortunately, current versions of GNU ld do not reliably do |
| 2845 | this, and thus we may have found an incorrect entry above. |
| 2846 | As a (temporary) sanity check, we only use the entry if it |
| 2847 | lies *within* the bounds of the function. Note that this check |
| 2848 | might reject perfectly valid entries that just happen to cover |
| 2849 | multiple functions; therefore this check ought to be removed |
| 2850 | once the linker is fixed. */ |
| 2851 | if (func_start > exidx_region) |
| 2852 | return 0; |
| 2853 | } |
| 2854 | |
| 2855 | /* Decode the list of unwinding instructions into a prologue cache. |
| 2856 | Note that this may fail due to e.g. a "refuse to unwind" code. */ |
| 2857 | cache = arm_exidx_fill_cache (this_frame, entry); |
| 2858 | if (!cache) |
| 2859 | return 0; |
| 2860 | |
| 2861 | *this_prologue_cache = cache; |
| 2862 | return 1; |
| 2863 | } |
| 2864 | |
| 2865 | struct frame_unwind arm_exidx_unwind = { |
| 2866 | NORMAL_FRAME, |
| 2867 | default_frame_unwind_stop_reason, |
| 2868 | arm_prologue_this_id, |
| 2869 | arm_prologue_prev_register, |
| 2870 | NULL, |
| 2871 | arm_exidx_unwind_sniffer |
| 2872 | }; |
| 2873 | |
| 2874 | static struct arm_prologue_cache * |
| 2875 | arm_make_stub_cache (struct frame_info *this_frame) |
| 2876 | { |
| 2877 | struct arm_prologue_cache *cache; |
| 2878 | |
| 2879 | cache = FRAME_OBSTACK_ZALLOC (struct arm_prologue_cache); |
| 2880 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 2881 | |
| 2882 | cache->prev_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); |
| 2883 | |
| 2884 | return cache; |
| 2885 | } |
| 2886 | |
| 2887 | /* Our frame ID for a stub frame is the current SP and LR. */ |
| 2888 | |
| 2889 | static void |
| 2890 | arm_stub_this_id (struct frame_info *this_frame, |
| 2891 | void **this_cache, |
| 2892 | struct frame_id *this_id) |
| 2893 | { |
| 2894 | struct arm_prologue_cache *cache; |
| 2895 | |
| 2896 | if (*this_cache == NULL) |
| 2897 | *this_cache = arm_make_stub_cache (this_frame); |
| 2898 | cache = *this_cache; |
| 2899 | |
| 2900 | *this_id = frame_id_build (cache->prev_sp, get_frame_pc (this_frame)); |
| 2901 | } |
| 2902 | |
| 2903 | static int |
| 2904 | arm_stub_unwind_sniffer (const struct frame_unwind *self, |
| 2905 | struct frame_info *this_frame, |
| 2906 | void **this_prologue_cache) |
| 2907 | { |
| 2908 | CORE_ADDR addr_in_block; |
| 2909 | char dummy[4]; |
| 2910 | |
| 2911 | addr_in_block = get_frame_address_in_block (this_frame); |
| 2912 | if (in_plt_section (addr_in_block, NULL) |
| 2913 | /* We also use the stub winder if the target memory is unreadable |
| 2914 | to avoid having the prologue unwinder trying to read it. */ |
| 2915 | || target_read_memory (get_frame_pc (this_frame), dummy, 4) != 0) |
| 2916 | return 1; |
| 2917 | |
| 2918 | return 0; |
| 2919 | } |
| 2920 | |
| 2921 | struct frame_unwind arm_stub_unwind = { |
| 2922 | NORMAL_FRAME, |
| 2923 | default_frame_unwind_stop_reason, |
| 2924 | arm_stub_this_id, |
| 2925 | arm_prologue_prev_register, |
| 2926 | NULL, |
| 2927 | arm_stub_unwind_sniffer |
| 2928 | }; |
| 2929 | |
| 2930 | static CORE_ADDR |
| 2931 | arm_normal_frame_base (struct frame_info *this_frame, void **this_cache) |
| 2932 | { |
| 2933 | struct arm_prologue_cache *cache; |
| 2934 | |
| 2935 | if (*this_cache == NULL) |
| 2936 | *this_cache = arm_make_prologue_cache (this_frame); |
| 2937 | cache = *this_cache; |
| 2938 | |
| 2939 | return cache->prev_sp - cache->framesize; |
| 2940 | } |
| 2941 | |
| 2942 | struct frame_base arm_normal_base = { |
| 2943 | &arm_prologue_unwind, |
| 2944 | arm_normal_frame_base, |
| 2945 | arm_normal_frame_base, |
| 2946 | arm_normal_frame_base |
| 2947 | }; |
| 2948 | |
| 2949 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that |
| 2950 | dummy frame. The frame ID's base needs to match the TOS value |
| 2951 | saved by save_dummy_frame_tos() and returned from |
| 2952 | arm_push_dummy_call, and the PC needs to match the dummy frame's |
| 2953 | breakpoint. */ |
| 2954 | |
| 2955 | static struct frame_id |
| 2956 | arm_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 2957 | { |
| 2958 | return frame_id_build (get_frame_register_unsigned (this_frame, |
| 2959 | ARM_SP_REGNUM), |
| 2960 | get_frame_pc (this_frame)); |
| 2961 | } |
| 2962 | |
| 2963 | /* Given THIS_FRAME, find the previous frame's resume PC (which will |
| 2964 | be used to construct the previous frame's ID, after looking up the |
| 2965 | containing function). */ |
| 2966 | |
| 2967 | static CORE_ADDR |
| 2968 | arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 2969 | { |
| 2970 | CORE_ADDR pc; |
| 2971 | pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM); |
| 2972 | return arm_addr_bits_remove (gdbarch, pc); |
| 2973 | } |
| 2974 | |
| 2975 | static CORE_ADDR |
| 2976 | arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 2977 | { |
| 2978 | return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM); |
| 2979 | } |
| 2980 | |
| 2981 | static struct value * |
| 2982 | arm_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache, |
| 2983 | int regnum) |
| 2984 | { |
| 2985 | struct gdbarch * gdbarch = get_frame_arch (this_frame); |
| 2986 | CORE_ADDR lr, cpsr; |
| 2987 | ULONGEST t_bit = arm_psr_thumb_bit (gdbarch); |
| 2988 | |
| 2989 | switch (regnum) |
| 2990 | { |
| 2991 | case ARM_PC_REGNUM: |
| 2992 | /* The PC is normally copied from the return column, which |
| 2993 | describes saves of LR. However, that version may have an |
| 2994 | extra bit set to indicate Thumb state. The bit is not |
| 2995 | part of the PC. */ |
| 2996 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
| 2997 | return frame_unwind_got_constant (this_frame, regnum, |
| 2998 | arm_addr_bits_remove (gdbarch, lr)); |
| 2999 | |
| 3000 | case ARM_PS_REGNUM: |
| 3001 | /* Reconstruct the T bit; see arm_prologue_prev_register for details. */ |
| 3002 | cpsr = get_frame_register_unsigned (this_frame, regnum); |
| 3003 | lr = frame_unwind_register_unsigned (this_frame, ARM_LR_REGNUM); |
| 3004 | if (IS_THUMB_ADDR (lr)) |
| 3005 | cpsr |= t_bit; |
| 3006 | else |
| 3007 | cpsr &= ~t_bit; |
| 3008 | return frame_unwind_got_constant (this_frame, regnum, cpsr); |
| 3009 | |
| 3010 | default: |
| 3011 | internal_error (__FILE__, __LINE__, |
| 3012 | _("Unexpected register %d"), regnum); |
| 3013 | } |
| 3014 | } |
| 3015 | |
| 3016 | static void |
| 3017 | arm_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum, |
| 3018 | struct dwarf2_frame_state_reg *reg, |
| 3019 | struct frame_info *this_frame) |
| 3020 | { |
| 3021 | switch (regnum) |
| 3022 | { |
| 3023 | case ARM_PC_REGNUM: |
| 3024 | case ARM_PS_REGNUM: |
| 3025 | reg->how = DWARF2_FRAME_REG_FN; |
| 3026 | reg->loc.fn = arm_dwarf2_prev_register; |
| 3027 | break; |
| 3028 | case ARM_SP_REGNUM: |
| 3029 | reg->how = DWARF2_FRAME_REG_CFA; |
| 3030 | break; |
| 3031 | } |
| 3032 | } |
| 3033 | |
| 3034 | /* Return true if we are in the function's epilogue, i.e. after the |
| 3035 | instruction that destroyed the function's stack frame. */ |
| 3036 | |
| 3037 | static int |
| 3038 | thumb_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 3039 | { |
| 3040 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 3041 | unsigned int insn, insn2; |
| 3042 | int found_return = 0, found_stack_adjust = 0; |
| 3043 | CORE_ADDR func_start, func_end; |
| 3044 | CORE_ADDR scan_pc; |
| 3045 | gdb_byte buf[4]; |
| 3046 | |
| 3047 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) |
| 3048 | return 0; |
| 3049 | |
| 3050 | /* The epilogue is a sequence of instructions along the following lines: |
| 3051 | |
| 3052 | - add stack frame size to SP or FP |
| 3053 | - [if frame pointer used] restore SP from FP |
| 3054 | - restore registers from SP [may include PC] |
| 3055 | - a return-type instruction [if PC wasn't already restored] |
| 3056 | |
| 3057 | In a first pass, we scan forward from the current PC and verify the |
| 3058 | instructions we find as compatible with this sequence, ending in a |
| 3059 | return instruction. |
| 3060 | |
| 3061 | However, this is not sufficient to distinguish indirect function calls |
| 3062 | within a function from indirect tail calls in the epilogue in some cases. |
| 3063 | Therefore, if we didn't already find any SP-changing instruction during |
| 3064 | forward scan, we add a backward scanning heuristic to ensure we actually |
| 3065 | are in the epilogue. */ |
| 3066 | |
| 3067 | scan_pc = pc; |
| 3068 | while (scan_pc < func_end && !found_return) |
| 3069 | { |
| 3070 | if (target_read_memory (scan_pc, buf, 2)) |
| 3071 | break; |
| 3072 | |
| 3073 | scan_pc += 2; |
| 3074 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); |
| 3075 | |
| 3076 | if ((insn & 0xff80) == 0x4700) /* bx <Rm> */ |
| 3077 | found_return = 1; |
| 3078 | else if (insn == 0x46f7) /* mov pc, lr */ |
| 3079 | found_return = 1; |
| 3080 | else if (insn == 0x46bd) /* mov sp, r7 */ |
| 3081 | found_stack_adjust = 1; |
| 3082 | else if ((insn & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ |
| 3083 | found_stack_adjust = 1; |
| 3084 | else if ((insn & 0xfe00) == 0xbc00) /* pop <registers> */ |
| 3085 | { |
| 3086 | found_stack_adjust = 1; |
| 3087 | if (insn & 0x0100) /* <registers> include PC. */ |
| 3088 | found_return = 1; |
| 3089 | } |
| 3090 | else if (thumb_insn_size (insn) == 4) /* 32-bit Thumb-2 instruction */ |
| 3091 | { |
| 3092 | if (target_read_memory (scan_pc, buf, 2)) |
| 3093 | break; |
| 3094 | |
| 3095 | scan_pc += 2; |
| 3096 | insn2 = extract_unsigned_integer (buf, 2, byte_order_for_code); |
| 3097 | |
| 3098 | if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ |
| 3099 | { |
| 3100 | found_stack_adjust = 1; |
| 3101 | if (insn2 & 0x8000) /* <registers> include PC. */ |
| 3102 | found_return = 1; |
| 3103 | } |
| 3104 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ |
| 3105 | && (insn2 & 0x0fff) == 0x0b04) |
| 3106 | { |
| 3107 | found_stack_adjust = 1; |
| 3108 | if ((insn2 & 0xf000) == 0xf000) /* <Rt> is PC. */ |
| 3109 | found_return = 1; |
| 3110 | } |
| 3111 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ |
| 3112 | && (insn2 & 0x0e00) == 0x0a00) |
| 3113 | found_stack_adjust = 1; |
| 3114 | else |
| 3115 | break; |
| 3116 | } |
| 3117 | else |
| 3118 | break; |
| 3119 | } |
| 3120 | |
| 3121 | if (!found_return) |
| 3122 | return 0; |
| 3123 | |
| 3124 | /* Since any instruction in the epilogue sequence, with the possible |
| 3125 | exception of return itself, updates the stack pointer, we need to |
| 3126 | scan backwards for at most one instruction. Try either a 16-bit or |
| 3127 | a 32-bit instruction. This is just a heuristic, so we do not worry |
| 3128 | too much about false positives. */ |
| 3129 | |
| 3130 | if (!found_stack_adjust) |
| 3131 | { |
| 3132 | if (pc - 4 < func_start) |
| 3133 | return 0; |
| 3134 | if (target_read_memory (pc - 4, buf, 4)) |
| 3135 | return 0; |
| 3136 | |
| 3137 | insn = extract_unsigned_integer (buf, 2, byte_order_for_code); |
| 3138 | insn2 = extract_unsigned_integer (buf + 2, 2, byte_order_for_code); |
| 3139 | |
| 3140 | if (insn2 == 0x46bd) /* mov sp, r7 */ |
| 3141 | found_stack_adjust = 1; |
| 3142 | else if ((insn2 & 0xff00) == 0xb000) /* add sp, imm or sub sp, imm */ |
| 3143 | found_stack_adjust = 1; |
| 3144 | else if ((insn2 & 0xff00) == 0xbc00) /* pop <registers> without PC */ |
| 3145 | found_stack_adjust = 1; |
| 3146 | else if (insn == 0xe8bd) /* ldm.w sp!, <registers> */ |
| 3147 | found_stack_adjust = 1; |
| 3148 | else if (insn == 0xf85d /* ldr.w <Rt>, [sp], #4 */ |
| 3149 | && (insn2 & 0x0fff) == 0x0b04) |
| 3150 | found_stack_adjust = 1; |
| 3151 | else if ((insn & 0xffbf) == 0xecbd /* vldm sp!, <list> */ |
| 3152 | && (insn2 & 0x0e00) == 0x0a00) |
| 3153 | found_stack_adjust = 1; |
| 3154 | } |
| 3155 | |
| 3156 | return found_stack_adjust; |
| 3157 | } |
| 3158 | |
| 3159 | /* Return true if we are in the function's epilogue, i.e. after the |
| 3160 | instruction that destroyed the function's stack frame. */ |
| 3161 | |
| 3162 | static int |
| 3163 | arm_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 3164 | { |
| 3165 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 3166 | unsigned int insn; |
| 3167 | int found_return, found_stack_adjust; |
| 3168 | CORE_ADDR func_start, func_end; |
| 3169 | |
| 3170 | if (arm_pc_is_thumb (gdbarch, pc)) |
| 3171 | return thumb_in_function_epilogue_p (gdbarch, pc); |
| 3172 | |
| 3173 | if (!find_pc_partial_function (pc, NULL, &func_start, &func_end)) |
| 3174 | return 0; |
| 3175 | |
| 3176 | /* We are in the epilogue if the previous instruction was a stack |
| 3177 | adjustment and the next instruction is a possible return (bx, mov |
| 3178 | pc, or pop). We could have to scan backwards to find the stack |
| 3179 | adjustment, or forwards to find the return, but this is a decent |
| 3180 | approximation. First scan forwards. */ |
| 3181 | |
| 3182 | found_return = 0; |
| 3183 | insn = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
| 3184 | if (bits (insn, 28, 31) != INST_NV) |
| 3185 | { |
| 3186 | if ((insn & 0x0ffffff0) == 0x012fff10) |
| 3187 | /* BX. */ |
| 3188 | found_return = 1; |
| 3189 | else if ((insn & 0x0ffffff0) == 0x01a0f000) |
| 3190 | /* MOV PC. */ |
| 3191 | found_return = 1; |
| 3192 | else if ((insn & 0x0fff0000) == 0x08bd0000 |
| 3193 | && (insn & 0x0000c000) != 0) |
| 3194 | /* POP (LDMIA), including PC or LR. */ |
| 3195 | found_return = 1; |
| 3196 | } |
| 3197 | |
| 3198 | if (!found_return) |
| 3199 | return 0; |
| 3200 | |
| 3201 | /* Scan backwards. This is just a heuristic, so do not worry about |
| 3202 | false positives from mode changes. */ |
| 3203 | |
| 3204 | if (pc < func_start + 4) |
| 3205 | return 0; |
| 3206 | |
| 3207 | found_stack_adjust = 0; |
| 3208 | insn = read_memory_unsigned_integer (pc - 4, 4, byte_order_for_code); |
| 3209 | if (bits (insn, 28, 31) != INST_NV) |
| 3210 | { |
| 3211 | if ((insn & 0x0df0f000) == 0x0080d000) |
| 3212 | /* ADD SP (register or immediate). */ |
| 3213 | found_stack_adjust = 1; |
| 3214 | else if ((insn & 0x0df0f000) == 0x0040d000) |
| 3215 | /* SUB SP (register or immediate). */ |
| 3216 | found_stack_adjust = 1; |
| 3217 | else if ((insn & 0x0ffffff0) == 0x01a0d000) |
| 3218 | /* MOV SP. */ |
| 3219 | found_stack_adjust = 1; |
| 3220 | else if ((insn & 0x0fff0000) == 0x08bd0000) |
| 3221 | /* POP (LDMIA). */ |
| 3222 | found_stack_adjust = 1; |
| 3223 | } |
| 3224 | |
| 3225 | if (found_stack_adjust) |
| 3226 | return 1; |
| 3227 | |
| 3228 | return 0; |
| 3229 | } |
| 3230 | |
| 3231 | |
| 3232 | /* When arguments must be pushed onto the stack, they go on in reverse |
| 3233 | order. The code below implements a FILO (stack) to do this. */ |
| 3234 | |
| 3235 | struct stack_item |
| 3236 | { |
| 3237 | int len; |
| 3238 | struct stack_item *prev; |
| 3239 | void *data; |
| 3240 | }; |
| 3241 | |
| 3242 | static struct stack_item * |
| 3243 | push_stack_item (struct stack_item *prev, const void *contents, int len) |
| 3244 | { |
| 3245 | struct stack_item *si; |
| 3246 | si = xmalloc (sizeof (struct stack_item)); |
| 3247 | si->data = xmalloc (len); |
| 3248 | si->len = len; |
| 3249 | si->prev = prev; |
| 3250 | memcpy (si->data, contents, len); |
| 3251 | return si; |
| 3252 | } |
| 3253 | |
| 3254 | static struct stack_item * |
| 3255 | pop_stack_item (struct stack_item *si) |
| 3256 | { |
| 3257 | struct stack_item *dead = si; |
| 3258 | si = si->prev; |
| 3259 | xfree (dead->data); |
| 3260 | xfree (dead); |
| 3261 | return si; |
| 3262 | } |
| 3263 | |
| 3264 | |
| 3265 | /* Return the alignment (in bytes) of the given type. */ |
| 3266 | |
| 3267 | static int |
| 3268 | arm_type_align (struct type *t) |
| 3269 | { |
| 3270 | int n; |
| 3271 | int align; |
| 3272 | int falign; |
| 3273 | |
| 3274 | t = check_typedef (t); |
| 3275 | switch (TYPE_CODE (t)) |
| 3276 | { |
| 3277 | default: |
| 3278 | /* Should never happen. */ |
| 3279 | internal_error (__FILE__, __LINE__, _("unknown type alignment")); |
| 3280 | return 4; |
| 3281 | |
| 3282 | case TYPE_CODE_PTR: |
| 3283 | case TYPE_CODE_ENUM: |
| 3284 | case TYPE_CODE_INT: |
| 3285 | case TYPE_CODE_FLT: |
| 3286 | case TYPE_CODE_SET: |
| 3287 | case TYPE_CODE_RANGE: |
| 3288 | case TYPE_CODE_BITSTRING: |
| 3289 | case TYPE_CODE_REF: |
| 3290 | case TYPE_CODE_CHAR: |
| 3291 | case TYPE_CODE_BOOL: |
| 3292 | return TYPE_LENGTH (t); |
| 3293 | |
| 3294 | case TYPE_CODE_ARRAY: |
| 3295 | case TYPE_CODE_COMPLEX: |
| 3296 | /* TODO: What about vector types? */ |
| 3297 | return arm_type_align (TYPE_TARGET_TYPE (t)); |
| 3298 | |
| 3299 | case TYPE_CODE_STRUCT: |
| 3300 | case TYPE_CODE_UNION: |
| 3301 | align = 1; |
| 3302 | for (n = 0; n < TYPE_NFIELDS (t); n++) |
| 3303 | { |
| 3304 | falign = arm_type_align (TYPE_FIELD_TYPE (t, n)); |
| 3305 | if (falign > align) |
| 3306 | align = falign; |
| 3307 | } |
| 3308 | return align; |
| 3309 | } |
| 3310 | } |
| 3311 | |
| 3312 | /* Possible base types for a candidate for passing and returning in |
| 3313 | VFP registers. */ |
| 3314 | |
| 3315 | enum arm_vfp_cprc_base_type |
| 3316 | { |
| 3317 | VFP_CPRC_UNKNOWN, |
| 3318 | VFP_CPRC_SINGLE, |
| 3319 | VFP_CPRC_DOUBLE, |
| 3320 | VFP_CPRC_VEC64, |
| 3321 | VFP_CPRC_VEC128 |
| 3322 | }; |
| 3323 | |
| 3324 | /* The length of one element of base type B. */ |
| 3325 | |
| 3326 | static unsigned |
| 3327 | arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b) |
| 3328 | { |
| 3329 | switch (b) |
| 3330 | { |
| 3331 | case VFP_CPRC_SINGLE: |
| 3332 | return 4; |
| 3333 | case VFP_CPRC_DOUBLE: |
| 3334 | return 8; |
| 3335 | case VFP_CPRC_VEC64: |
| 3336 | return 8; |
| 3337 | case VFP_CPRC_VEC128: |
| 3338 | return 16; |
| 3339 | default: |
| 3340 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), |
| 3341 | (int) b); |
| 3342 | } |
| 3343 | } |
| 3344 | |
| 3345 | /* The character ('s', 'd' or 'q') for the type of VFP register used |
| 3346 | for passing base type B. */ |
| 3347 | |
| 3348 | static int |
| 3349 | arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b) |
| 3350 | { |
| 3351 | switch (b) |
| 3352 | { |
| 3353 | case VFP_CPRC_SINGLE: |
| 3354 | return 's'; |
| 3355 | case VFP_CPRC_DOUBLE: |
| 3356 | return 'd'; |
| 3357 | case VFP_CPRC_VEC64: |
| 3358 | return 'd'; |
| 3359 | case VFP_CPRC_VEC128: |
| 3360 | return 'q'; |
| 3361 | default: |
| 3362 | internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."), |
| 3363 | (int) b); |
| 3364 | } |
| 3365 | } |
| 3366 | |
| 3367 | /* Determine whether T may be part of a candidate for passing and |
| 3368 | returning in VFP registers, ignoring the limit on the total number |
| 3369 | of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the |
| 3370 | classification of the first valid component found; if it is not |
| 3371 | VFP_CPRC_UNKNOWN, all components must have the same classification |
| 3372 | as *BASE_TYPE. If it is found that T contains a type not permitted |
| 3373 | for passing and returning in VFP registers, a type differently |
| 3374 | classified from *BASE_TYPE, or two types differently classified |
| 3375 | from each other, return -1, otherwise return the total number of |
| 3376 | base-type elements found (possibly 0 in an empty structure or |
| 3377 | array). Vectors and complex types are not currently supported, |
| 3378 | matching the generic AAPCS support. */ |
| 3379 | |
| 3380 | static int |
| 3381 | arm_vfp_cprc_sub_candidate (struct type *t, |
| 3382 | enum arm_vfp_cprc_base_type *base_type) |
| 3383 | { |
| 3384 | t = check_typedef (t); |
| 3385 | switch (TYPE_CODE (t)) |
| 3386 | { |
| 3387 | case TYPE_CODE_FLT: |
| 3388 | switch (TYPE_LENGTH (t)) |
| 3389 | { |
| 3390 | case 4: |
| 3391 | if (*base_type == VFP_CPRC_UNKNOWN) |
| 3392 | *base_type = VFP_CPRC_SINGLE; |
| 3393 | else if (*base_type != VFP_CPRC_SINGLE) |
| 3394 | return -1; |
| 3395 | return 1; |
| 3396 | |
| 3397 | case 8: |
| 3398 | if (*base_type == VFP_CPRC_UNKNOWN) |
| 3399 | *base_type = VFP_CPRC_DOUBLE; |
| 3400 | else if (*base_type != VFP_CPRC_DOUBLE) |
| 3401 | return -1; |
| 3402 | return 1; |
| 3403 | |
| 3404 | default: |
| 3405 | return -1; |
| 3406 | } |
| 3407 | break; |
| 3408 | |
| 3409 | case TYPE_CODE_ARRAY: |
| 3410 | { |
| 3411 | int count; |
| 3412 | unsigned unitlen; |
| 3413 | count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type); |
| 3414 | if (count == -1) |
| 3415 | return -1; |
| 3416 | if (TYPE_LENGTH (t) == 0) |
| 3417 | { |
| 3418 | gdb_assert (count == 0); |
| 3419 | return 0; |
| 3420 | } |
| 3421 | else if (count == 0) |
| 3422 | return -1; |
| 3423 | unitlen = arm_vfp_cprc_unit_length (*base_type); |
| 3424 | gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0); |
| 3425 | return TYPE_LENGTH (t) / unitlen; |
| 3426 | } |
| 3427 | break; |
| 3428 | |
| 3429 | case TYPE_CODE_STRUCT: |
| 3430 | { |
| 3431 | int count = 0; |
| 3432 | unsigned unitlen; |
| 3433 | int i; |
| 3434 | for (i = 0; i < TYPE_NFIELDS (t); i++) |
| 3435 | { |
| 3436 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), |
| 3437 | base_type); |
| 3438 | if (sub_count == -1) |
| 3439 | return -1; |
| 3440 | count += sub_count; |
| 3441 | } |
| 3442 | if (TYPE_LENGTH (t) == 0) |
| 3443 | { |
| 3444 | gdb_assert (count == 0); |
| 3445 | return 0; |
| 3446 | } |
| 3447 | else if (count == 0) |
| 3448 | return -1; |
| 3449 | unitlen = arm_vfp_cprc_unit_length (*base_type); |
| 3450 | if (TYPE_LENGTH (t) != unitlen * count) |
| 3451 | return -1; |
| 3452 | return count; |
| 3453 | } |
| 3454 | |
| 3455 | case TYPE_CODE_UNION: |
| 3456 | { |
| 3457 | int count = 0; |
| 3458 | unsigned unitlen; |
| 3459 | int i; |
| 3460 | for (i = 0; i < TYPE_NFIELDS (t); i++) |
| 3461 | { |
| 3462 | int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i), |
| 3463 | base_type); |
| 3464 | if (sub_count == -1) |
| 3465 | return -1; |
| 3466 | count = (count > sub_count ? count : sub_count); |
| 3467 | } |
| 3468 | if (TYPE_LENGTH (t) == 0) |
| 3469 | { |
| 3470 | gdb_assert (count == 0); |
| 3471 | return 0; |
| 3472 | } |
| 3473 | else if (count == 0) |
| 3474 | return -1; |
| 3475 | unitlen = arm_vfp_cprc_unit_length (*base_type); |
| 3476 | if (TYPE_LENGTH (t) != unitlen * count) |
| 3477 | return -1; |
| 3478 | return count; |
| 3479 | } |
| 3480 | |
| 3481 | default: |
| 3482 | break; |
| 3483 | } |
| 3484 | |
| 3485 | return -1; |
| 3486 | } |
| 3487 | |
| 3488 | /* Determine whether T is a VFP co-processor register candidate (CPRC) |
| 3489 | if passed to or returned from a non-variadic function with the VFP |
| 3490 | ABI in effect. Return 1 if it is, 0 otherwise. If it is, set |
| 3491 | *BASE_TYPE to the base type for T and *COUNT to the number of |
| 3492 | elements of that base type before returning. */ |
| 3493 | |
| 3494 | static int |
| 3495 | arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type, |
| 3496 | int *count) |
| 3497 | { |
| 3498 | enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN; |
| 3499 | int c = arm_vfp_cprc_sub_candidate (t, &b); |
| 3500 | if (c <= 0 || c > 4) |
| 3501 | return 0; |
| 3502 | *base_type = b; |
| 3503 | *count = c; |
| 3504 | return 1; |
| 3505 | } |
| 3506 | |
| 3507 | /* Return 1 if the VFP ABI should be used for passing arguments to and |
| 3508 | returning values from a function of type FUNC_TYPE, 0 |
| 3509 | otherwise. */ |
| 3510 | |
| 3511 | static int |
| 3512 | arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type) |
| 3513 | { |
| 3514 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3515 | /* Variadic functions always use the base ABI. Assume that functions |
| 3516 | without debug info are not variadic. */ |
| 3517 | if (func_type && TYPE_VARARGS (check_typedef (func_type))) |
| 3518 | return 0; |
| 3519 | /* The VFP ABI is only supported as a variant of AAPCS. */ |
| 3520 | if (tdep->arm_abi != ARM_ABI_AAPCS) |
| 3521 | return 0; |
| 3522 | return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP; |
| 3523 | } |
| 3524 | |
| 3525 | /* We currently only support passing parameters in integer registers, which |
| 3526 | conforms with GCC's default model, and VFP argument passing following |
| 3527 | the VFP variant of AAPCS. Several other variants exist and |
| 3528 | we should probably support some of them based on the selected ABI. */ |
| 3529 | |
| 3530 | static CORE_ADDR |
| 3531 | arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 3532 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
| 3533 | struct value **args, CORE_ADDR sp, int struct_return, |
| 3534 | CORE_ADDR struct_addr) |
| 3535 | { |
| 3536 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 3537 | int argnum; |
| 3538 | int argreg; |
| 3539 | int nstack; |
| 3540 | struct stack_item *si = NULL; |
| 3541 | int use_vfp_abi; |
| 3542 | struct type *ftype; |
| 3543 | unsigned vfp_regs_free = (1 << 16) - 1; |
| 3544 | |
| 3545 | /* Determine the type of this function and whether the VFP ABI |
| 3546 | applies. */ |
| 3547 | ftype = check_typedef (value_type (function)); |
| 3548 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
| 3549 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 3550 | use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype); |
| 3551 | |
| 3552 | /* Set the return address. For the ARM, the return breakpoint is |
| 3553 | always at BP_ADDR. */ |
| 3554 | if (arm_pc_is_thumb (gdbarch, bp_addr)) |
| 3555 | bp_addr |= 1; |
| 3556 | regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, bp_addr); |
| 3557 | |
| 3558 | /* Walk through the list of args and determine how large a temporary |
| 3559 | stack is required. Need to take care here as structs may be |
| 3560 | passed on the stack, and we have to push them. */ |
| 3561 | nstack = 0; |
| 3562 | |
| 3563 | argreg = ARM_A1_REGNUM; |
| 3564 | nstack = 0; |
| 3565 | |
| 3566 | /* The struct_return pointer occupies the first parameter |
| 3567 | passing register. */ |
| 3568 | if (struct_return) |
| 3569 | { |
| 3570 | if (arm_debug) |
| 3571 | fprintf_unfiltered (gdb_stdlog, "struct return in %s = %s\n", |
| 3572 | gdbarch_register_name (gdbarch, argreg), |
| 3573 | paddress (gdbarch, struct_addr)); |
| 3574 | regcache_cooked_write_unsigned (regcache, argreg, struct_addr); |
| 3575 | argreg++; |
| 3576 | } |
| 3577 | |
| 3578 | for (argnum = 0; argnum < nargs; argnum++) |
| 3579 | { |
| 3580 | int len; |
| 3581 | struct type *arg_type; |
| 3582 | struct type *target_type; |
| 3583 | enum type_code typecode; |
| 3584 | const bfd_byte *val; |
| 3585 | int align; |
| 3586 | enum arm_vfp_cprc_base_type vfp_base_type; |
| 3587 | int vfp_base_count; |
| 3588 | int may_use_core_reg = 1; |
| 3589 | |
| 3590 | arg_type = check_typedef (value_type (args[argnum])); |
| 3591 | len = TYPE_LENGTH (arg_type); |
| 3592 | target_type = TYPE_TARGET_TYPE (arg_type); |
| 3593 | typecode = TYPE_CODE (arg_type); |
| 3594 | val = value_contents (args[argnum]); |
| 3595 | |
| 3596 | align = arm_type_align (arg_type); |
| 3597 | /* Round alignment up to a whole number of words. */ |
| 3598 | align = (align + INT_REGISTER_SIZE - 1) & ~(INT_REGISTER_SIZE - 1); |
| 3599 | /* Different ABIs have different maximum alignments. */ |
| 3600 | if (gdbarch_tdep (gdbarch)->arm_abi == ARM_ABI_APCS) |
| 3601 | { |
| 3602 | /* The APCS ABI only requires word alignment. */ |
| 3603 | align = INT_REGISTER_SIZE; |
| 3604 | } |
| 3605 | else |
| 3606 | { |
| 3607 | /* The AAPCS requires at most doubleword alignment. */ |
| 3608 | if (align > INT_REGISTER_SIZE * 2) |
| 3609 | align = INT_REGISTER_SIZE * 2; |
| 3610 | } |
| 3611 | |
| 3612 | if (use_vfp_abi |
| 3613 | && arm_vfp_call_candidate (arg_type, &vfp_base_type, |
| 3614 | &vfp_base_count)) |
| 3615 | { |
| 3616 | int regno; |
| 3617 | int unit_length; |
| 3618 | int shift; |
| 3619 | unsigned mask; |
| 3620 | |
| 3621 | /* Because this is a CPRC it cannot go in a core register or |
| 3622 | cause a core register to be skipped for alignment. |
| 3623 | Either it goes in VFP registers and the rest of this loop |
| 3624 | iteration is skipped for this argument, or it goes on the |
| 3625 | stack (and the stack alignment code is correct for this |
| 3626 | case). */ |
| 3627 | may_use_core_reg = 0; |
| 3628 | |
| 3629 | unit_length = arm_vfp_cprc_unit_length (vfp_base_type); |
| 3630 | shift = unit_length / 4; |
| 3631 | mask = (1 << (shift * vfp_base_count)) - 1; |
| 3632 | for (regno = 0; regno < 16; regno += shift) |
| 3633 | if (((vfp_regs_free >> regno) & mask) == mask) |
| 3634 | break; |
| 3635 | |
| 3636 | if (regno < 16) |
| 3637 | { |
| 3638 | int reg_char; |
| 3639 | int reg_scaled; |
| 3640 | int i; |
| 3641 | |
| 3642 | vfp_regs_free &= ~(mask << regno); |
| 3643 | reg_scaled = regno / shift; |
| 3644 | reg_char = arm_vfp_cprc_reg_char (vfp_base_type); |
| 3645 | for (i = 0; i < vfp_base_count; i++) |
| 3646 | { |
| 3647 | char name_buf[4]; |
| 3648 | int regnum; |
| 3649 | if (reg_char == 'q') |
| 3650 | arm_neon_quad_write (gdbarch, regcache, reg_scaled + i, |
| 3651 | val + i * unit_length); |
| 3652 | else |
| 3653 | { |
| 3654 | sprintf (name_buf, "%c%d", reg_char, reg_scaled + i); |
| 3655 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 3656 | strlen (name_buf)); |
| 3657 | regcache_cooked_write (regcache, regnum, |
| 3658 | val + i * unit_length); |
| 3659 | } |
| 3660 | } |
| 3661 | continue; |
| 3662 | } |
| 3663 | else |
| 3664 | { |
| 3665 | /* This CPRC could not go in VFP registers, so all VFP |
| 3666 | registers are now marked as used. */ |
| 3667 | vfp_regs_free = 0; |
| 3668 | } |
| 3669 | } |
| 3670 | |
| 3671 | /* Push stack padding for dowubleword alignment. */ |
| 3672 | if (nstack & (align - 1)) |
| 3673 | { |
| 3674 | si = push_stack_item (si, val, INT_REGISTER_SIZE); |
| 3675 | nstack += INT_REGISTER_SIZE; |
| 3676 | } |
| 3677 | |
| 3678 | /* Doubleword aligned quantities must go in even register pairs. */ |
| 3679 | if (may_use_core_reg |
| 3680 | && argreg <= ARM_LAST_ARG_REGNUM |
| 3681 | && align > INT_REGISTER_SIZE |
| 3682 | && argreg & 1) |
| 3683 | argreg++; |
| 3684 | |
| 3685 | /* If the argument is a pointer to a function, and it is a |
| 3686 | Thumb function, create a LOCAL copy of the value and set |
| 3687 | the THUMB bit in it. */ |
| 3688 | if (TYPE_CODE_PTR == typecode |
| 3689 | && target_type != NULL |
| 3690 | && TYPE_CODE_FUNC == TYPE_CODE (check_typedef (target_type))) |
| 3691 | { |
| 3692 | CORE_ADDR regval = extract_unsigned_integer (val, len, byte_order); |
| 3693 | if (arm_pc_is_thumb (gdbarch, regval)) |
| 3694 | { |
| 3695 | bfd_byte *copy = alloca (len); |
| 3696 | store_unsigned_integer (copy, len, byte_order, |
| 3697 | MAKE_THUMB_ADDR (regval)); |
| 3698 | val = copy; |
| 3699 | } |
| 3700 | } |
| 3701 | |
| 3702 | /* Copy the argument to general registers or the stack in |
| 3703 | register-sized pieces. Large arguments are split between |
| 3704 | registers and stack. */ |
| 3705 | while (len > 0) |
| 3706 | { |
| 3707 | int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE; |
| 3708 | |
| 3709 | if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM) |
| 3710 | { |
| 3711 | /* The argument is being passed in a general purpose |
| 3712 | register. */ |
| 3713 | CORE_ADDR regval |
| 3714 | = extract_unsigned_integer (val, partial_len, byte_order); |
| 3715 | if (byte_order == BFD_ENDIAN_BIG) |
| 3716 | regval <<= (INT_REGISTER_SIZE - partial_len) * 8; |
| 3717 | if (arm_debug) |
| 3718 | fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n", |
| 3719 | argnum, |
| 3720 | gdbarch_register_name |
| 3721 | (gdbarch, argreg), |
| 3722 | phex (regval, INT_REGISTER_SIZE)); |
| 3723 | regcache_cooked_write_unsigned (regcache, argreg, regval); |
| 3724 | argreg++; |
| 3725 | } |
| 3726 | else |
| 3727 | { |
| 3728 | /* Push the arguments onto the stack. */ |
| 3729 | if (arm_debug) |
| 3730 | fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n", |
| 3731 | argnum, nstack); |
| 3732 | si = push_stack_item (si, val, INT_REGISTER_SIZE); |
| 3733 | nstack += INT_REGISTER_SIZE; |
| 3734 | } |
| 3735 | |
| 3736 | len -= partial_len; |
| 3737 | val += partial_len; |
| 3738 | } |
| 3739 | } |
| 3740 | /* If we have an odd number of words to push, then decrement the stack |
| 3741 | by one word now, so first stack argument will be dword aligned. */ |
| 3742 | if (nstack & 4) |
| 3743 | sp -= 4; |
| 3744 | |
| 3745 | while (si) |
| 3746 | { |
| 3747 | sp -= si->len; |
| 3748 | write_memory (sp, si->data, si->len); |
| 3749 | si = pop_stack_item (si); |
| 3750 | } |
| 3751 | |
| 3752 | /* Finally, update teh SP register. */ |
| 3753 | regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp); |
| 3754 | |
| 3755 | return sp; |
| 3756 | } |
| 3757 | |
| 3758 | |
| 3759 | /* Always align the frame to an 8-byte boundary. This is required on |
| 3760 | some platforms and harmless on the rest. */ |
| 3761 | |
| 3762 | static CORE_ADDR |
| 3763 | arm_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) |
| 3764 | { |
| 3765 | /* Align the stack to eight bytes. */ |
| 3766 | return sp & ~ (CORE_ADDR) 7; |
| 3767 | } |
| 3768 | |
| 3769 | static void |
| 3770 | print_fpu_flags (int flags) |
| 3771 | { |
| 3772 | if (flags & (1 << 0)) |
| 3773 | fputs ("IVO ", stdout); |
| 3774 | if (flags & (1 << 1)) |
| 3775 | fputs ("DVZ ", stdout); |
| 3776 | if (flags & (1 << 2)) |
| 3777 | fputs ("OFL ", stdout); |
| 3778 | if (flags & (1 << 3)) |
| 3779 | fputs ("UFL ", stdout); |
| 3780 | if (flags & (1 << 4)) |
| 3781 | fputs ("INX ", stdout); |
| 3782 | putchar ('\n'); |
| 3783 | } |
| 3784 | |
| 3785 | /* Print interesting information about the floating point processor |
| 3786 | (if present) or emulator. */ |
| 3787 | static void |
| 3788 | arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
| 3789 | struct frame_info *frame, const char *args) |
| 3790 | { |
| 3791 | unsigned long status = get_frame_register_unsigned (frame, ARM_FPS_REGNUM); |
| 3792 | int type; |
| 3793 | |
| 3794 | type = (status >> 24) & 127; |
| 3795 | if (status & (1 << 31)) |
| 3796 | printf (_("Hardware FPU type %d\n"), type); |
| 3797 | else |
| 3798 | printf (_("Software FPU type %d\n"), type); |
| 3799 | /* i18n: [floating point unit] mask */ |
| 3800 | fputs (_("mask: "), stdout); |
| 3801 | print_fpu_flags (status >> 16); |
| 3802 | /* i18n: [floating point unit] flags */ |
| 3803 | fputs (_("flags: "), stdout); |
| 3804 | print_fpu_flags (status); |
| 3805 | } |
| 3806 | |
| 3807 | /* Construct the ARM extended floating point type. */ |
| 3808 | static struct type * |
| 3809 | arm_ext_type (struct gdbarch *gdbarch) |
| 3810 | { |
| 3811 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3812 | |
| 3813 | if (!tdep->arm_ext_type) |
| 3814 | tdep->arm_ext_type |
| 3815 | = arch_float_type (gdbarch, -1, "builtin_type_arm_ext", |
| 3816 | floatformats_arm_ext); |
| 3817 | |
| 3818 | return tdep->arm_ext_type; |
| 3819 | } |
| 3820 | |
| 3821 | static struct type * |
| 3822 | arm_neon_double_type (struct gdbarch *gdbarch) |
| 3823 | { |
| 3824 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3825 | |
| 3826 | if (tdep->neon_double_type == NULL) |
| 3827 | { |
| 3828 | struct type *t, *elem; |
| 3829 | |
| 3830 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_d", |
| 3831 | TYPE_CODE_UNION); |
| 3832 | elem = builtin_type (gdbarch)->builtin_uint8; |
| 3833 | append_composite_type_field (t, "u8", init_vector_type (elem, 8)); |
| 3834 | elem = builtin_type (gdbarch)->builtin_uint16; |
| 3835 | append_composite_type_field (t, "u16", init_vector_type (elem, 4)); |
| 3836 | elem = builtin_type (gdbarch)->builtin_uint32; |
| 3837 | append_composite_type_field (t, "u32", init_vector_type (elem, 2)); |
| 3838 | elem = builtin_type (gdbarch)->builtin_uint64; |
| 3839 | append_composite_type_field (t, "u64", elem); |
| 3840 | elem = builtin_type (gdbarch)->builtin_float; |
| 3841 | append_composite_type_field (t, "f32", init_vector_type (elem, 2)); |
| 3842 | elem = builtin_type (gdbarch)->builtin_double; |
| 3843 | append_composite_type_field (t, "f64", elem); |
| 3844 | |
| 3845 | TYPE_VECTOR (t) = 1; |
| 3846 | TYPE_NAME (t) = "neon_d"; |
| 3847 | tdep->neon_double_type = t; |
| 3848 | } |
| 3849 | |
| 3850 | return tdep->neon_double_type; |
| 3851 | } |
| 3852 | |
| 3853 | /* FIXME: The vector types are not correctly ordered on big-endian |
| 3854 | targets. Just as s0 is the low bits of d0, d0[0] is also the low |
| 3855 | bits of d0 - regardless of what unit size is being held in d0. So |
| 3856 | the offset of the first uint8 in d0 is 7, but the offset of the |
| 3857 | first float is 4. This code works as-is for little-endian |
| 3858 | targets. */ |
| 3859 | |
| 3860 | static struct type * |
| 3861 | arm_neon_quad_type (struct gdbarch *gdbarch) |
| 3862 | { |
| 3863 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 3864 | |
| 3865 | if (tdep->neon_quad_type == NULL) |
| 3866 | { |
| 3867 | struct type *t, *elem; |
| 3868 | |
| 3869 | t = arch_composite_type (gdbarch, "__gdb_builtin_type_neon_q", |
| 3870 | TYPE_CODE_UNION); |
| 3871 | elem = builtin_type (gdbarch)->builtin_uint8; |
| 3872 | append_composite_type_field (t, "u8", init_vector_type (elem, 16)); |
| 3873 | elem = builtin_type (gdbarch)->builtin_uint16; |
| 3874 | append_composite_type_field (t, "u16", init_vector_type (elem, 8)); |
| 3875 | elem = builtin_type (gdbarch)->builtin_uint32; |
| 3876 | append_composite_type_field (t, "u32", init_vector_type (elem, 4)); |
| 3877 | elem = builtin_type (gdbarch)->builtin_uint64; |
| 3878 | append_composite_type_field (t, "u64", init_vector_type (elem, 2)); |
| 3879 | elem = builtin_type (gdbarch)->builtin_float; |
| 3880 | append_composite_type_field (t, "f32", init_vector_type (elem, 4)); |
| 3881 | elem = builtin_type (gdbarch)->builtin_double; |
| 3882 | append_composite_type_field (t, "f64", init_vector_type (elem, 2)); |
| 3883 | |
| 3884 | TYPE_VECTOR (t) = 1; |
| 3885 | TYPE_NAME (t) = "neon_q"; |
| 3886 | tdep->neon_quad_type = t; |
| 3887 | } |
| 3888 | |
| 3889 | return tdep->neon_quad_type; |
| 3890 | } |
| 3891 | |
| 3892 | /* Return the GDB type object for the "standard" data type of data in |
| 3893 | register N. */ |
| 3894 | |
| 3895 | static struct type * |
| 3896 | arm_register_type (struct gdbarch *gdbarch, int regnum) |
| 3897 | { |
| 3898 | int num_regs = gdbarch_num_regs (gdbarch); |
| 3899 | |
| 3900 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos |
| 3901 | && regnum >= num_regs && regnum < num_regs + 32) |
| 3902 | return builtin_type (gdbarch)->builtin_float; |
| 3903 | |
| 3904 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos |
| 3905 | && regnum >= num_regs + 32 && regnum < num_regs + 32 + 16) |
| 3906 | return arm_neon_quad_type (gdbarch); |
| 3907 | |
| 3908 | /* If the target description has register information, we are only |
| 3909 | in this function so that we can override the types of |
| 3910 | double-precision registers for NEON. */ |
| 3911 | if (tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 3912 | { |
| 3913 | struct type *t = tdesc_register_type (gdbarch, regnum); |
| 3914 | |
| 3915 | if (regnum >= ARM_D0_REGNUM && regnum < ARM_D0_REGNUM + 32 |
| 3916 | && TYPE_CODE (t) == TYPE_CODE_FLT |
| 3917 | && gdbarch_tdep (gdbarch)->have_neon) |
| 3918 | return arm_neon_double_type (gdbarch); |
| 3919 | else |
| 3920 | return t; |
| 3921 | } |
| 3922 | |
| 3923 | if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS) |
| 3924 | { |
| 3925 | if (!gdbarch_tdep (gdbarch)->have_fpa_registers) |
| 3926 | return builtin_type (gdbarch)->builtin_void; |
| 3927 | |
| 3928 | return arm_ext_type (gdbarch); |
| 3929 | } |
| 3930 | else if (regnum == ARM_SP_REGNUM) |
| 3931 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 3932 | else if (regnum == ARM_PC_REGNUM) |
| 3933 | return builtin_type (gdbarch)->builtin_func_ptr; |
| 3934 | else if (regnum >= ARRAY_SIZE (arm_register_names)) |
| 3935 | /* These registers are only supported on targets which supply |
| 3936 | an XML description. */ |
| 3937 | return builtin_type (gdbarch)->builtin_int0; |
| 3938 | else |
| 3939 | return builtin_type (gdbarch)->builtin_uint32; |
| 3940 | } |
| 3941 | |
| 3942 | /* Map a DWARF register REGNUM onto the appropriate GDB register |
| 3943 | number. */ |
| 3944 | |
| 3945 | static int |
| 3946 | arm_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg) |
| 3947 | { |
| 3948 | /* Core integer regs. */ |
| 3949 | if (reg >= 0 && reg <= 15) |
| 3950 | return reg; |
| 3951 | |
| 3952 | /* Legacy FPA encoding. These were once used in a way which |
| 3953 | overlapped with VFP register numbering, so their use is |
| 3954 | discouraged, but GDB doesn't support the ARM toolchain |
| 3955 | which used them for VFP. */ |
| 3956 | if (reg >= 16 && reg <= 23) |
| 3957 | return ARM_F0_REGNUM + reg - 16; |
| 3958 | |
| 3959 | /* New assignments for the FPA registers. */ |
| 3960 | if (reg >= 96 && reg <= 103) |
| 3961 | return ARM_F0_REGNUM + reg - 96; |
| 3962 | |
| 3963 | /* WMMX register assignments. */ |
| 3964 | if (reg >= 104 && reg <= 111) |
| 3965 | return ARM_WCGR0_REGNUM + reg - 104; |
| 3966 | |
| 3967 | if (reg >= 112 && reg <= 127) |
| 3968 | return ARM_WR0_REGNUM + reg - 112; |
| 3969 | |
| 3970 | if (reg >= 192 && reg <= 199) |
| 3971 | return ARM_WC0_REGNUM + reg - 192; |
| 3972 | |
| 3973 | /* VFP v2 registers. A double precision value is actually |
| 3974 | in d1 rather than s2, but the ABI only defines numbering |
| 3975 | for the single precision registers. This will "just work" |
| 3976 | in GDB for little endian targets (we'll read eight bytes, |
| 3977 | starting in s0 and then progressing to s1), but will be |
| 3978 | reversed on big endian targets with VFP. This won't |
| 3979 | be a problem for the new Neon quad registers; you're supposed |
| 3980 | to use DW_OP_piece for those. */ |
| 3981 | if (reg >= 64 && reg <= 95) |
| 3982 | { |
| 3983 | char name_buf[4]; |
| 3984 | |
| 3985 | sprintf (name_buf, "s%d", reg - 64); |
| 3986 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 3987 | strlen (name_buf)); |
| 3988 | } |
| 3989 | |
| 3990 | /* VFP v3 / Neon registers. This range is also used for VFP v2 |
| 3991 | registers, except that it now describes d0 instead of s0. */ |
| 3992 | if (reg >= 256 && reg <= 287) |
| 3993 | { |
| 3994 | char name_buf[4]; |
| 3995 | |
| 3996 | sprintf (name_buf, "d%d", reg - 256); |
| 3997 | return user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 3998 | strlen (name_buf)); |
| 3999 | } |
| 4000 | |
| 4001 | return -1; |
| 4002 | } |
| 4003 | |
| 4004 | /* Map GDB internal REGNUM onto the Arm simulator register numbers. */ |
| 4005 | static int |
| 4006 | arm_register_sim_regno (struct gdbarch *gdbarch, int regnum) |
| 4007 | { |
| 4008 | int reg = regnum; |
| 4009 | gdb_assert (reg >= 0 && reg < gdbarch_num_regs (gdbarch)); |
| 4010 | |
| 4011 | if (regnum >= ARM_WR0_REGNUM && regnum <= ARM_WR15_REGNUM) |
| 4012 | return regnum - ARM_WR0_REGNUM + SIM_ARM_IWMMXT_COP0R0_REGNUM; |
| 4013 | |
| 4014 | if (regnum >= ARM_WC0_REGNUM && regnum <= ARM_WC7_REGNUM) |
| 4015 | return regnum - ARM_WC0_REGNUM + SIM_ARM_IWMMXT_COP1R0_REGNUM; |
| 4016 | |
| 4017 | if (regnum >= ARM_WCGR0_REGNUM && regnum <= ARM_WCGR7_REGNUM) |
| 4018 | return regnum - ARM_WCGR0_REGNUM + SIM_ARM_IWMMXT_COP1R8_REGNUM; |
| 4019 | |
| 4020 | if (reg < NUM_GREGS) |
| 4021 | return SIM_ARM_R0_REGNUM + reg; |
| 4022 | reg -= NUM_GREGS; |
| 4023 | |
| 4024 | if (reg < NUM_FREGS) |
| 4025 | return SIM_ARM_FP0_REGNUM + reg; |
| 4026 | reg -= NUM_FREGS; |
| 4027 | |
| 4028 | if (reg < NUM_SREGS) |
| 4029 | return SIM_ARM_FPS_REGNUM + reg; |
| 4030 | reg -= NUM_SREGS; |
| 4031 | |
| 4032 | internal_error (__FILE__, __LINE__, _("Bad REGNUM %d"), regnum); |
| 4033 | } |
| 4034 | |
| 4035 | /* NOTE: cagney/2001-08-20: Both convert_from_extended() and |
| 4036 | convert_to_extended() use floatformat_arm_ext_littlebyte_bigword. |
| 4037 | It is thought that this is is the floating-point register format on |
| 4038 | little-endian systems. */ |
| 4039 | |
| 4040 | static void |
| 4041 | convert_from_extended (const struct floatformat *fmt, const void *ptr, |
| 4042 | void *dbl, int endianess) |
| 4043 | { |
| 4044 | DOUBLEST d; |
| 4045 | |
| 4046 | if (endianess == BFD_ENDIAN_BIG) |
| 4047 | floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d); |
| 4048 | else |
| 4049 | floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword, |
| 4050 | ptr, &d); |
| 4051 | floatformat_from_doublest (fmt, &d, dbl); |
| 4052 | } |
| 4053 | |
| 4054 | static void |
| 4055 | convert_to_extended (const struct floatformat *fmt, void *dbl, const void *ptr, |
| 4056 | int endianess) |
| 4057 | { |
| 4058 | DOUBLEST d; |
| 4059 | |
| 4060 | floatformat_to_doublest (fmt, ptr, &d); |
| 4061 | if (endianess == BFD_ENDIAN_BIG) |
| 4062 | floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl); |
| 4063 | else |
| 4064 | floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword, |
| 4065 | &d, dbl); |
| 4066 | } |
| 4067 | |
| 4068 | static int |
| 4069 | condition_true (unsigned long cond, unsigned long status_reg) |
| 4070 | { |
| 4071 | if (cond == INST_AL || cond == INST_NV) |
| 4072 | return 1; |
| 4073 | |
| 4074 | switch (cond) |
| 4075 | { |
| 4076 | case INST_EQ: |
| 4077 | return ((status_reg & FLAG_Z) != 0); |
| 4078 | case INST_NE: |
| 4079 | return ((status_reg & FLAG_Z) == 0); |
| 4080 | case INST_CS: |
| 4081 | return ((status_reg & FLAG_C) != 0); |
| 4082 | case INST_CC: |
| 4083 | return ((status_reg & FLAG_C) == 0); |
| 4084 | case INST_MI: |
| 4085 | return ((status_reg & FLAG_N) != 0); |
| 4086 | case INST_PL: |
| 4087 | return ((status_reg & FLAG_N) == 0); |
| 4088 | case INST_VS: |
| 4089 | return ((status_reg & FLAG_V) != 0); |
| 4090 | case INST_VC: |
| 4091 | return ((status_reg & FLAG_V) == 0); |
| 4092 | case INST_HI: |
| 4093 | return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C); |
| 4094 | case INST_LS: |
| 4095 | return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C); |
| 4096 | case INST_GE: |
| 4097 | return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)); |
| 4098 | case INST_LT: |
| 4099 | return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)); |
| 4100 | case INST_GT: |
| 4101 | return (((status_reg & FLAG_Z) == 0) |
| 4102 | && (((status_reg & FLAG_N) == 0) |
| 4103 | == ((status_reg & FLAG_V) == 0))); |
| 4104 | case INST_LE: |
| 4105 | return (((status_reg & FLAG_Z) != 0) |
| 4106 | || (((status_reg & FLAG_N) == 0) |
| 4107 | != ((status_reg & FLAG_V) == 0))); |
| 4108 | } |
| 4109 | return 1; |
| 4110 | } |
| 4111 | |
| 4112 | static unsigned long |
| 4113 | shifted_reg_val (struct frame_info *frame, unsigned long inst, int carry, |
| 4114 | unsigned long pc_val, unsigned long status_reg) |
| 4115 | { |
| 4116 | unsigned long res, shift; |
| 4117 | int rm = bits (inst, 0, 3); |
| 4118 | unsigned long shifttype = bits (inst, 5, 6); |
| 4119 | |
| 4120 | if (bit (inst, 4)) |
| 4121 | { |
| 4122 | int rs = bits (inst, 8, 11); |
| 4123 | shift = (rs == 15 ? pc_val + 8 |
| 4124 | : get_frame_register_unsigned (frame, rs)) & 0xFF; |
| 4125 | } |
| 4126 | else |
| 4127 | shift = bits (inst, 7, 11); |
| 4128 | |
| 4129 | res = (rm == ARM_PC_REGNUM |
| 4130 | ? (pc_val + (bit (inst, 4) ? 12 : 8)) |
| 4131 | : get_frame_register_unsigned (frame, rm)); |
| 4132 | |
| 4133 | switch (shifttype) |
| 4134 | { |
| 4135 | case 0: /* LSL */ |
| 4136 | res = shift >= 32 ? 0 : res << shift; |
| 4137 | break; |
| 4138 | |
| 4139 | case 1: /* LSR */ |
| 4140 | res = shift >= 32 ? 0 : res >> shift; |
| 4141 | break; |
| 4142 | |
| 4143 | case 2: /* ASR */ |
| 4144 | if (shift >= 32) |
| 4145 | shift = 31; |
| 4146 | res = ((res & 0x80000000L) |
| 4147 | ? ~((~res) >> shift) : res >> shift); |
| 4148 | break; |
| 4149 | |
| 4150 | case 3: /* ROR/RRX */ |
| 4151 | shift &= 31; |
| 4152 | if (shift == 0) |
| 4153 | res = (res >> 1) | (carry ? 0x80000000L : 0); |
| 4154 | else |
| 4155 | res = (res >> shift) | (res << (32 - shift)); |
| 4156 | break; |
| 4157 | } |
| 4158 | |
| 4159 | return res & 0xffffffff; |
| 4160 | } |
| 4161 | |
| 4162 | /* Return number of 1-bits in VAL. */ |
| 4163 | |
| 4164 | static int |
| 4165 | bitcount (unsigned long val) |
| 4166 | { |
| 4167 | int nbits; |
| 4168 | for (nbits = 0; val != 0; nbits++) |
| 4169 | val &= val - 1; /* Delete rightmost 1-bit in val. */ |
| 4170 | return nbits; |
| 4171 | } |
| 4172 | |
| 4173 | /* Return the size in bytes of the complete Thumb instruction whose |
| 4174 | first halfword is INST1. */ |
| 4175 | |
| 4176 | static int |
| 4177 | thumb_insn_size (unsigned short inst1) |
| 4178 | { |
| 4179 | if ((inst1 & 0xe000) == 0xe000 && (inst1 & 0x1800) != 0) |
| 4180 | return 4; |
| 4181 | else |
| 4182 | return 2; |
| 4183 | } |
| 4184 | |
| 4185 | static int |
| 4186 | thumb_advance_itstate (unsigned int itstate) |
| 4187 | { |
| 4188 | /* Preserve IT[7:5], the first three bits of the condition. Shift |
| 4189 | the upcoming condition flags left by one bit. */ |
| 4190 | itstate = (itstate & 0xe0) | ((itstate << 1) & 0x1f); |
| 4191 | |
| 4192 | /* If we have finished the IT block, clear the state. */ |
| 4193 | if ((itstate & 0x0f) == 0) |
| 4194 | itstate = 0; |
| 4195 | |
| 4196 | return itstate; |
| 4197 | } |
| 4198 | |
| 4199 | /* Find the next PC after the current instruction executes. In some |
| 4200 | cases we can not statically determine the answer (see the IT state |
| 4201 | handling in this function); in that case, a breakpoint may be |
| 4202 | inserted in addition to the returned PC, which will be used to set |
| 4203 | another breakpoint by our caller. */ |
| 4204 | |
| 4205 | static CORE_ADDR |
| 4206 | thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
| 4207 | { |
| 4208 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 4209 | struct address_space *aspace = get_frame_address_space (frame); |
| 4210 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 4211 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 4212 | unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */ |
| 4213 | unsigned short inst1; |
| 4214 | CORE_ADDR nextpc = pc + 2; /* Default is next instruction. */ |
| 4215 | unsigned long offset; |
| 4216 | ULONGEST status, itstate; |
| 4217 | |
| 4218 | nextpc = MAKE_THUMB_ADDR (nextpc); |
| 4219 | pc_val = MAKE_THUMB_ADDR (pc_val); |
| 4220 | |
| 4221 | inst1 = read_memory_unsigned_integer (pc, 2, byte_order_for_code); |
| 4222 | |
| 4223 | /* Thumb-2 conditional execution support. There are eight bits in |
| 4224 | the CPSR which describe conditional execution state. Once |
| 4225 | reconstructed (they're in a funny order), the low five bits |
| 4226 | describe the low bit of the condition for each instruction and |
| 4227 | how many instructions remain. The high three bits describe the |
| 4228 | base condition. One of the low four bits will be set if an IT |
| 4229 | block is active. These bits read as zero on earlier |
| 4230 | processors. */ |
| 4231 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
| 4232 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); |
| 4233 | |
| 4234 | /* If-Then handling. On GNU/Linux, where this routine is used, we |
| 4235 | use an undefined instruction as a breakpoint. Unlike BKPT, IT |
| 4236 | can disable execution of the undefined instruction. So we might |
| 4237 | miss the breakpoint if we set it on a skipped conditional |
| 4238 | instruction. Because conditional instructions can change the |
| 4239 | flags, affecting the execution of further instructions, we may |
| 4240 | need to set two breakpoints. */ |
| 4241 | |
| 4242 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint != NULL) |
| 4243 | { |
| 4244 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) |
| 4245 | { |
| 4246 | /* An IT instruction. Because this instruction does not |
| 4247 | modify the flags, we can accurately predict the next |
| 4248 | executed instruction. */ |
| 4249 | itstate = inst1 & 0x00ff; |
| 4250 | pc += thumb_insn_size (inst1); |
| 4251 | |
| 4252 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) |
| 4253 | { |
| 4254 | inst1 = read_memory_unsigned_integer (pc, 2, |
| 4255 | byte_order_for_code); |
| 4256 | pc += thumb_insn_size (inst1); |
| 4257 | itstate = thumb_advance_itstate (itstate); |
| 4258 | } |
| 4259 | |
| 4260 | return MAKE_THUMB_ADDR (pc); |
| 4261 | } |
| 4262 | else if (itstate != 0) |
| 4263 | { |
| 4264 | /* We are in a conditional block. Check the condition. */ |
| 4265 | if (! condition_true (itstate >> 4, status)) |
| 4266 | { |
| 4267 | /* Advance to the next executed instruction. */ |
| 4268 | pc += thumb_insn_size (inst1); |
| 4269 | itstate = thumb_advance_itstate (itstate); |
| 4270 | |
| 4271 | while (itstate != 0 && ! condition_true (itstate >> 4, status)) |
| 4272 | { |
| 4273 | inst1 = read_memory_unsigned_integer (pc, 2, |
| 4274 | byte_order_for_code); |
| 4275 | pc += thumb_insn_size (inst1); |
| 4276 | itstate = thumb_advance_itstate (itstate); |
| 4277 | } |
| 4278 | |
| 4279 | return MAKE_THUMB_ADDR (pc); |
| 4280 | } |
| 4281 | else if ((itstate & 0x0f) == 0x08) |
| 4282 | { |
| 4283 | /* This is the last instruction of the conditional |
| 4284 | block, and it is executed. We can handle it normally |
| 4285 | because the following instruction is not conditional, |
| 4286 | and we must handle it normally because it is |
| 4287 | permitted to branch. Fall through. */ |
| 4288 | } |
| 4289 | else |
| 4290 | { |
| 4291 | int cond_negated; |
| 4292 | |
| 4293 | /* There are conditional instructions after this one. |
| 4294 | If this instruction modifies the flags, then we can |
| 4295 | not predict what the next executed instruction will |
| 4296 | be. Fortunately, this instruction is architecturally |
| 4297 | forbidden to branch; we know it will fall through. |
| 4298 | Start by skipping past it. */ |
| 4299 | pc += thumb_insn_size (inst1); |
| 4300 | itstate = thumb_advance_itstate (itstate); |
| 4301 | |
| 4302 | /* Set a breakpoint on the following instruction. */ |
| 4303 | gdb_assert ((itstate & 0x0f) != 0); |
| 4304 | arm_insert_single_step_breakpoint (gdbarch, aspace, |
| 4305 | MAKE_THUMB_ADDR (pc)); |
| 4306 | cond_negated = (itstate >> 4) & 1; |
| 4307 | |
| 4308 | /* Skip all following instructions with the same |
| 4309 | condition. If there is a later instruction in the IT |
| 4310 | block with the opposite condition, set the other |
| 4311 | breakpoint there. If not, then set a breakpoint on |
| 4312 | the instruction after the IT block. */ |
| 4313 | do |
| 4314 | { |
| 4315 | inst1 = read_memory_unsigned_integer (pc, 2, |
| 4316 | byte_order_for_code); |
| 4317 | pc += thumb_insn_size (inst1); |
| 4318 | itstate = thumb_advance_itstate (itstate); |
| 4319 | } |
| 4320 | while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated); |
| 4321 | |
| 4322 | return MAKE_THUMB_ADDR (pc); |
| 4323 | } |
| 4324 | } |
| 4325 | } |
| 4326 | else if (itstate & 0x0f) |
| 4327 | { |
| 4328 | /* We are in a conditional block. Check the condition. */ |
| 4329 | int cond = itstate >> 4; |
| 4330 | |
| 4331 | if (! condition_true (cond, status)) |
| 4332 | /* Advance to the next instruction. All the 32-bit |
| 4333 | instructions share a common prefix. */ |
| 4334 | return MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1)); |
| 4335 | |
| 4336 | /* Otherwise, handle the instruction normally. */ |
| 4337 | } |
| 4338 | |
| 4339 | if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */ |
| 4340 | { |
| 4341 | CORE_ADDR sp; |
| 4342 | |
| 4343 | /* Fetch the saved PC from the stack. It's stored above |
| 4344 | all of the other registers. */ |
| 4345 | offset = bitcount (bits (inst1, 0, 7)) * INT_REGISTER_SIZE; |
| 4346 | sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM); |
| 4347 | nextpc = read_memory_unsigned_integer (sp + offset, 4, byte_order); |
| 4348 | } |
| 4349 | else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */ |
| 4350 | { |
| 4351 | unsigned long cond = bits (inst1, 8, 11); |
| 4352 | if (cond == 0x0f) /* 0x0f = SWI */ |
| 4353 | { |
| 4354 | struct gdbarch_tdep *tdep; |
| 4355 | tdep = gdbarch_tdep (gdbarch); |
| 4356 | |
| 4357 | if (tdep->syscall_next_pc != NULL) |
| 4358 | nextpc = tdep->syscall_next_pc (frame); |
| 4359 | |
| 4360 | } |
| 4361 | else if (cond != 0x0f && condition_true (cond, status)) |
| 4362 | nextpc = pc_val + (sbits (inst1, 0, 7) << 1); |
| 4363 | } |
| 4364 | else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */ |
| 4365 | { |
| 4366 | nextpc = pc_val + (sbits (inst1, 0, 10) << 1); |
| 4367 | } |
| 4368 | else if (thumb_insn_size (inst1) == 4) /* 32-bit instruction */ |
| 4369 | { |
| 4370 | unsigned short inst2; |
| 4371 | inst2 = read_memory_unsigned_integer (pc + 2, 2, byte_order_for_code); |
| 4372 | |
| 4373 | /* Default to the next instruction. */ |
| 4374 | nextpc = pc + 4; |
| 4375 | nextpc = MAKE_THUMB_ADDR (nextpc); |
| 4376 | |
| 4377 | if ((inst1 & 0xf800) == 0xf000 && (inst2 & 0x8000) == 0x8000) |
| 4378 | { |
| 4379 | /* Branches and miscellaneous control instructions. */ |
| 4380 | |
| 4381 | if ((inst2 & 0x1000) != 0 || (inst2 & 0xd001) == 0xc000) |
| 4382 | { |
| 4383 | /* B, BL, BLX. */ |
| 4384 | int j1, j2, imm1, imm2; |
| 4385 | |
| 4386 | imm1 = sbits (inst1, 0, 10); |
| 4387 | imm2 = bits (inst2, 0, 10); |
| 4388 | j1 = bit (inst2, 13); |
| 4389 | j2 = bit (inst2, 11); |
| 4390 | |
| 4391 | offset = ((imm1 << 12) + (imm2 << 1)); |
| 4392 | offset ^= ((!j2) << 22) | ((!j1) << 23); |
| 4393 | |
| 4394 | nextpc = pc_val + offset; |
| 4395 | /* For BLX make sure to clear the low bits. */ |
| 4396 | if (bit (inst2, 12) == 0) |
| 4397 | nextpc = nextpc & 0xfffffffc; |
| 4398 | } |
| 4399 | else if (inst1 == 0xf3de && (inst2 & 0xff00) == 0x3f00) |
| 4400 | { |
| 4401 | /* SUBS PC, LR, #imm8. */ |
| 4402 | nextpc = get_frame_register_unsigned (frame, ARM_LR_REGNUM); |
| 4403 | nextpc -= inst2 & 0x00ff; |
| 4404 | } |
| 4405 | else if ((inst2 & 0xd000) == 0x8000 && (inst1 & 0x0380) != 0x0380) |
| 4406 | { |
| 4407 | /* Conditional branch. */ |
| 4408 | if (condition_true (bits (inst1, 6, 9), status)) |
| 4409 | { |
| 4410 | int sign, j1, j2, imm1, imm2; |
| 4411 | |
| 4412 | sign = sbits (inst1, 10, 10); |
| 4413 | imm1 = bits (inst1, 0, 5); |
| 4414 | imm2 = bits (inst2, 0, 10); |
| 4415 | j1 = bit (inst2, 13); |
| 4416 | j2 = bit (inst2, 11); |
| 4417 | |
| 4418 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); |
| 4419 | offset += (imm1 << 12) + (imm2 << 1); |
| 4420 | |
| 4421 | nextpc = pc_val + offset; |
| 4422 | } |
| 4423 | } |
| 4424 | } |
| 4425 | else if ((inst1 & 0xfe50) == 0xe810) |
| 4426 | { |
| 4427 | /* Load multiple or RFE. */ |
| 4428 | int rn, offset, load_pc = 1; |
| 4429 | |
| 4430 | rn = bits (inst1, 0, 3); |
| 4431 | if (bit (inst1, 7) && !bit (inst1, 8)) |
| 4432 | { |
| 4433 | /* LDMIA or POP */ |
| 4434 | if (!bit (inst2, 15)) |
| 4435 | load_pc = 0; |
| 4436 | offset = bitcount (inst2) * 4 - 4; |
| 4437 | } |
| 4438 | else if (!bit (inst1, 7) && bit (inst1, 8)) |
| 4439 | { |
| 4440 | /* LDMDB */ |
| 4441 | if (!bit (inst2, 15)) |
| 4442 | load_pc = 0; |
| 4443 | offset = -4; |
| 4444 | } |
| 4445 | else if (bit (inst1, 7) && bit (inst1, 8)) |
| 4446 | { |
| 4447 | /* RFEIA */ |
| 4448 | offset = 0; |
| 4449 | } |
| 4450 | else if (!bit (inst1, 7) && !bit (inst1, 8)) |
| 4451 | { |
| 4452 | /* RFEDB */ |
| 4453 | offset = -8; |
| 4454 | } |
| 4455 | else |
| 4456 | load_pc = 0; |
| 4457 | |
| 4458 | if (load_pc) |
| 4459 | { |
| 4460 | CORE_ADDR addr = get_frame_register_unsigned (frame, rn); |
| 4461 | nextpc = get_frame_memory_unsigned (frame, addr + offset, 4); |
| 4462 | } |
| 4463 | } |
| 4464 | else if ((inst1 & 0xffef) == 0xea4f && (inst2 & 0xfff0) == 0x0f00) |
| 4465 | { |
| 4466 | /* MOV PC or MOVS PC. */ |
| 4467 | nextpc = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
| 4468 | nextpc = MAKE_THUMB_ADDR (nextpc); |
| 4469 | } |
| 4470 | else if ((inst1 & 0xff70) == 0xf850 && (inst2 & 0xf000) == 0xf000) |
| 4471 | { |
| 4472 | /* LDR PC. */ |
| 4473 | CORE_ADDR base; |
| 4474 | int rn, load_pc = 1; |
| 4475 | |
| 4476 | rn = bits (inst1, 0, 3); |
| 4477 | base = get_frame_register_unsigned (frame, rn); |
| 4478 | if (rn == ARM_PC_REGNUM) |
| 4479 | { |
| 4480 | base = (base + 4) & ~(CORE_ADDR) 0x3; |
| 4481 | if (bit (inst1, 7)) |
| 4482 | base += bits (inst2, 0, 11); |
| 4483 | else |
| 4484 | base -= bits (inst2, 0, 11); |
| 4485 | } |
| 4486 | else if (bit (inst1, 7)) |
| 4487 | base += bits (inst2, 0, 11); |
| 4488 | else if (bit (inst2, 11)) |
| 4489 | { |
| 4490 | if (bit (inst2, 10)) |
| 4491 | { |
| 4492 | if (bit (inst2, 9)) |
| 4493 | base += bits (inst2, 0, 7); |
| 4494 | else |
| 4495 | base -= bits (inst2, 0, 7); |
| 4496 | } |
| 4497 | } |
| 4498 | else if ((inst2 & 0x0fc0) == 0x0000) |
| 4499 | { |
| 4500 | int shift = bits (inst2, 4, 5), rm = bits (inst2, 0, 3); |
| 4501 | base += get_frame_register_unsigned (frame, rm) << shift; |
| 4502 | } |
| 4503 | else |
| 4504 | /* Reserved. */ |
| 4505 | load_pc = 0; |
| 4506 | |
| 4507 | if (load_pc) |
| 4508 | nextpc = get_frame_memory_unsigned (frame, base, 4); |
| 4509 | } |
| 4510 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf000) |
| 4511 | { |
| 4512 | /* TBB. */ |
| 4513 | CORE_ADDR tbl_reg, table, offset, length; |
| 4514 | |
| 4515 | tbl_reg = bits (inst1, 0, 3); |
| 4516 | if (tbl_reg == 0x0f) |
| 4517 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ |
| 4518 | else |
| 4519 | table = get_frame_register_unsigned (frame, tbl_reg); |
| 4520 | |
| 4521 | offset = get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
| 4522 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 1); |
| 4523 | nextpc = pc_val + length; |
| 4524 | } |
| 4525 | else if ((inst1 & 0xfff0) == 0xe8d0 && (inst2 & 0xfff0) == 0xf010) |
| 4526 | { |
| 4527 | /* TBH. */ |
| 4528 | CORE_ADDR tbl_reg, table, offset, length; |
| 4529 | |
| 4530 | tbl_reg = bits (inst1, 0, 3); |
| 4531 | if (tbl_reg == 0x0f) |
| 4532 | table = pc + 4; /* Regcache copy of PC isn't right yet. */ |
| 4533 | else |
| 4534 | table = get_frame_register_unsigned (frame, tbl_reg); |
| 4535 | |
| 4536 | offset = 2 * get_frame_register_unsigned (frame, bits (inst2, 0, 3)); |
| 4537 | length = 2 * get_frame_memory_unsigned (frame, table + offset, 2); |
| 4538 | nextpc = pc_val + length; |
| 4539 | } |
| 4540 | } |
| 4541 | else if ((inst1 & 0xff00) == 0x4700) /* bx REG, blx REG */ |
| 4542 | { |
| 4543 | if (bits (inst1, 3, 6) == 0x0f) |
| 4544 | nextpc = pc_val; |
| 4545 | else |
| 4546 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); |
| 4547 | } |
| 4548 | else if ((inst1 & 0xff87) == 0x4687) /* mov pc, REG */ |
| 4549 | { |
| 4550 | if (bits (inst1, 3, 6) == 0x0f) |
| 4551 | nextpc = pc_val; |
| 4552 | else |
| 4553 | nextpc = get_frame_register_unsigned (frame, bits (inst1, 3, 6)); |
| 4554 | |
| 4555 | nextpc = MAKE_THUMB_ADDR (nextpc); |
| 4556 | } |
| 4557 | else if ((inst1 & 0xf500) == 0xb100) |
| 4558 | { |
| 4559 | /* CBNZ or CBZ. */ |
| 4560 | int imm = (bit (inst1, 9) << 6) + (bits (inst1, 3, 7) << 1); |
| 4561 | ULONGEST reg = get_frame_register_unsigned (frame, bits (inst1, 0, 2)); |
| 4562 | |
| 4563 | if (bit (inst1, 11) && reg != 0) |
| 4564 | nextpc = pc_val + imm; |
| 4565 | else if (!bit (inst1, 11) && reg == 0) |
| 4566 | nextpc = pc_val + imm; |
| 4567 | } |
| 4568 | return nextpc; |
| 4569 | } |
| 4570 | |
| 4571 | /* Get the raw next address. PC is the current program counter, in |
| 4572 | FRAME, which is assumed to be executing in ARM mode. |
| 4573 | |
| 4574 | The value returned has the execution state of the next instruction |
| 4575 | encoded in it. Use IS_THUMB_ADDR () to see whether the instruction is |
| 4576 | in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory |
| 4577 | address. */ |
| 4578 | |
| 4579 | static CORE_ADDR |
| 4580 | arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc) |
| 4581 | { |
| 4582 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 4583 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 4584 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 4585 | unsigned long pc_val; |
| 4586 | unsigned long this_instr; |
| 4587 | unsigned long status; |
| 4588 | CORE_ADDR nextpc; |
| 4589 | |
| 4590 | pc_val = (unsigned long) pc; |
| 4591 | this_instr = read_memory_unsigned_integer (pc, 4, byte_order_for_code); |
| 4592 | |
| 4593 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
| 4594 | nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */ |
| 4595 | |
| 4596 | if (bits (this_instr, 28, 31) == INST_NV) |
| 4597 | switch (bits (this_instr, 24, 27)) |
| 4598 | { |
| 4599 | case 0xa: |
| 4600 | case 0xb: |
| 4601 | { |
| 4602 | /* Branch with Link and change to Thumb. */ |
| 4603 | nextpc = BranchDest (pc, this_instr); |
| 4604 | nextpc |= bit (this_instr, 24) << 1; |
| 4605 | nextpc = MAKE_THUMB_ADDR (nextpc); |
| 4606 | break; |
| 4607 | } |
| 4608 | case 0xc: |
| 4609 | case 0xd: |
| 4610 | case 0xe: |
| 4611 | /* Coprocessor register transfer. */ |
| 4612 | if (bits (this_instr, 12, 15) == 15) |
| 4613 | error (_("Invalid update to pc in instruction")); |
| 4614 | break; |
| 4615 | } |
| 4616 | else if (condition_true (bits (this_instr, 28, 31), status)) |
| 4617 | { |
| 4618 | switch (bits (this_instr, 24, 27)) |
| 4619 | { |
| 4620 | case 0x0: |
| 4621 | case 0x1: /* data processing */ |
| 4622 | case 0x2: |
| 4623 | case 0x3: |
| 4624 | { |
| 4625 | unsigned long operand1, operand2, result = 0; |
| 4626 | unsigned long rn; |
| 4627 | int c; |
| 4628 | |
| 4629 | if (bits (this_instr, 12, 15) != 15) |
| 4630 | break; |
| 4631 | |
| 4632 | if (bits (this_instr, 22, 25) == 0 |
| 4633 | && bits (this_instr, 4, 7) == 9) /* multiply */ |
| 4634 | error (_("Invalid update to pc in instruction")); |
| 4635 | |
| 4636 | /* BX <reg>, BLX <reg> */ |
| 4637 | if (bits (this_instr, 4, 27) == 0x12fff1 |
| 4638 | || bits (this_instr, 4, 27) == 0x12fff3) |
| 4639 | { |
| 4640 | rn = bits (this_instr, 0, 3); |
| 4641 | nextpc = ((rn == ARM_PC_REGNUM) |
| 4642 | ? (pc_val + 8) |
| 4643 | : get_frame_register_unsigned (frame, rn)); |
| 4644 | |
| 4645 | return nextpc; |
| 4646 | } |
| 4647 | |
| 4648 | /* Multiply into PC. */ |
| 4649 | c = (status & FLAG_C) ? 1 : 0; |
| 4650 | rn = bits (this_instr, 16, 19); |
| 4651 | operand1 = ((rn == ARM_PC_REGNUM) |
| 4652 | ? (pc_val + 8) |
| 4653 | : get_frame_register_unsigned (frame, rn)); |
| 4654 | |
| 4655 | if (bit (this_instr, 25)) |
| 4656 | { |
| 4657 | unsigned long immval = bits (this_instr, 0, 7); |
| 4658 | unsigned long rotate = 2 * bits (this_instr, 8, 11); |
| 4659 | operand2 = ((immval >> rotate) | (immval << (32 - rotate))) |
| 4660 | & 0xffffffff; |
| 4661 | } |
| 4662 | else /* operand 2 is a shifted register. */ |
| 4663 | operand2 = shifted_reg_val (frame, this_instr, c, |
| 4664 | pc_val, status); |
| 4665 | |
| 4666 | switch (bits (this_instr, 21, 24)) |
| 4667 | { |
| 4668 | case 0x0: /*and */ |
| 4669 | result = operand1 & operand2; |
| 4670 | break; |
| 4671 | |
| 4672 | case 0x1: /*eor */ |
| 4673 | result = operand1 ^ operand2; |
| 4674 | break; |
| 4675 | |
| 4676 | case 0x2: /*sub */ |
| 4677 | result = operand1 - operand2; |
| 4678 | break; |
| 4679 | |
| 4680 | case 0x3: /*rsb */ |
| 4681 | result = operand2 - operand1; |
| 4682 | break; |
| 4683 | |
| 4684 | case 0x4: /*add */ |
| 4685 | result = operand1 + operand2; |
| 4686 | break; |
| 4687 | |
| 4688 | case 0x5: /*adc */ |
| 4689 | result = operand1 + operand2 + c; |
| 4690 | break; |
| 4691 | |
| 4692 | case 0x6: /*sbc */ |
| 4693 | result = operand1 - operand2 + c; |
| 4694 | break; |
| 4695 | |
| 4696 | case 0x7: /*rsc */ |
| 4697 | result = operand2 - operand1 + c; |
| 4698 | break; |
| 4699 | |
| 4700 | case 0x8: |
| 4701 | case 0x9: |
| 4702 | case 0xa: |
| 4703 | case 0xb: /* tst, teq, cmp, cmn */ |
| 4704 | result = (unsigned long) nextpc; |
| 4705 | break; |
| 4706 | |
| 4707 | case 0xc: /*orr */ |
| 4708 | result = operand1 | operand2; |
| 4709 | break; |
| 4710 | |
| 4711 | case 0xd: /*mov */ |
| 4712 | /* Always step into a function. */ |
| 4713 | result = operand2; |
| 4714 | break; |
| 4715 | |
| 4716 | case 0xe: /*bic */ |
| 4717 | result = operand1 & ~operand2; |
| 4718 | break; |
| 4719 | |
| 4720 | case 0xf: /*mvn */ |
| 4721 | result = ~operand2; |
| 4722 | break; |
| 4723 | } |
| 4724 | |
| 4725 | /* In 26-bit APCS the bottom two bits of the result are |
| 4726 | ignored, and we always end up in ARM state. */ |
| 4727 | if (!arm_apcs_32) |
| 4728 | nextpc = arm_addr_bits_remove (gdbarch, result); |
| 4729 | else |
| 4730 | nextpc = result; |
| 4731 | |
| 4732 | break; |
| 4733 | } |
| 4734 | |
| 4735 | case 0x4: |
| 4736 | case 0x5: /* data transfer */ |
| 4737 | case 0x6: |
| 4738 | case 0x7: |
| 4739 | if (bit (this_instr, 20)) |
| 4740 | { |
| 4741 | /* load */ |
| 4742 | if (bits (this_instr, 12, 15) == 15) |
| 4743 | { |
| 4744 | /* rd == pc */ |
| 4745 | unsigned long rn; |
| 4746 | unsigned long base; |
| 4747 | |
| 4748 | if (bit (this_instr, 22)) |
| 4749 | error (_("Invalid update to pc in instruction")); |
| 4750 | |
| 4751 | /* byte write to PC */ |
| 4752 | rn = bits (this_instr, 16, 19); |
| 4753 | base = ((rn == ARM_PC_REGNUM) |
| 4754 | ? (pc_val + 8) |
| 4755 | : get_frame_register_unsigned (frame, rn)); |
| 4756 | |
| 4757 | if (bit (this_instr, 24)) |
| 4758 | { |
| 4759 | /* pre-indexed */ |
| 4760 | int c = (status & FLAG_C) ? 1 : 0; |
| 4761 | unsigned long offset = |
| 4762 | (bit (this_instr, 25) |
| 4763 | ? shifted_reg_val (frame, this_instr, c, pc_val, status) |
| 4764 | : bits (this_instr, 0, 11)); |
| 4765 | |
| 4766 | if (bit (this_instr, 23)) |
| 4767 | base += offset; |
| 4768 | else |
| 4769 | base -= offset; |
| 4770 | } |
| 4771 | nextpc = |
| 4772 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) base, |
| 4773 | 4, byte_order); |
| 4774 | } |
| 4775 | } |
| 4776 | break; |
| 4777 | |
| 4778 | case 0x8: |
| 4779 | case 0x9: /* block transfer */ |
| 4780 | if (bit (this_instr, 20)) |
| 4781 | { |
| 4782 | /* LDM */ |
| 4783 | if (bit (this_instr, 15)) |
| 4784 | { |
| 4785 | /* loading pc */ |
| 4786 | int offset = 0; |
| 4787 | unsigned long rn_val |
| 4788 | = get_frame_register_unsigned (frame, |
| 4789 | bits (this_instr, 16, 19)); |
| 4790 | |
| 4791 | if (bit (this_instr, 23)) |
| 4792 | { |
| 4793 | /* up */ |
| 4794 | unsigned long reglist = bits (this_instr, 0, 14); |
| 4795 | offset = bitcount (reglist) * 4; |
| 4796 | if (bit (this_instr, 24)) /* pre */ |
| 4797 | offset += 4; |
| 4798 | } |
| 4799 | else if (bit (this_instr, 24)) |
| 4800 | offset = -4; |
| 4801 | |
| 4802 | nextpc = |
| 4803 | (CORE_ADDR) read_memory_unsigned_integer ((CORE_ADDR) |
| 4804 | (rn_val + offset), |
| 4805 | 4, byte_order); |
| 4806 | } |
| 4807 | } |
| 4808 | break; |
| 4809 | |
| 4810 | case 0xb: /* branch & link */ |
| 4811 | case 0xa: /* branch */ |
| 4812 | { |
| 4813 | nextpc = BranchDest (pc, this_instr); |
| 4814 | break; |
| 4815 | } |
| 4816 | |
| 4817 | case 0xc: |
| 4818 | case 0xd: |
| 4819 | case 0xe: /* coproc ops */ |
| 4820 | break; |
| 4821 | case 0xf: /* SWI */ |
| 4822 | { |
| 4823 | struct gdbarch_tdep *tdep; |
| 4824 | tdep = gdbarch_tdep (gdbarch); |
| 4825 | |
| 4826 | if (tdep->syscall_next_pc != NULL) |
| 4827 | nextpc = tdep->syscall_next_pc (frame); |
| 4828 | |
| 4829 | } |
| 4830 | break; |
| 4831 | |
| 4832 | default: |
| 4833 | fprintf_filtered (gdb_stderr, _("Bad bit-field extraction\n")); |
| 4834 | return (pc); |
| 4835 | } |
| 4836 | } |
| 4837 | |
| 4838 | return nextpc; |
| 4839 | } |
| 4840 | |
| 4841 | /* Determine next PC after current instruction executes. Will call either |
| 4842 | arm_get_next_pc_raw or thumb_get_next_pc_raw. Error out if infinite |
| 4843 | loop is detected. */ |
| 4844 | |
| 4845 | CORE_ADDR |
| 4846 | arm_get_next_pc (struct frame_info *frame, CORE_ADDR pc) |
| 4847 | { |
| 4848 | CORE_ADDR nextpc; |
| 4849 | |
| 4850 | if (arm_frame_is_thumb (frame)) |
| 4851 | { |
| 4852 | nextpc = thumb_get_next_pc_raw (frame, pc); |
| 4853 | if (nextpc == MAKE_THUMB_ADDR (pc)) |
| 4854 | error (_("Infinite loop detected")); |
| 4855 | } |
| 4856 | else |
| 4857 | { |
| 4858 | nextpc = arm_get_next_pc_raw (frame, pc); |
| 4859 | if (nextpc == pc) |
| 4860 | error (_("Infinite loop detected")); |
| 4861 | } |
| 4862 | |
| 4863 | return nextpc; |
| 4864 | } |
| 4865 | |
| 4866 | /* Like insert_single_step_breakpoint, but make sure we use a breakpoint |
| 4867 | of the appropriate mode (as encoded in the PC value), even if this |
| 4868 | differs from what would be expected according to the symbol tables. */ |
| 4869 | |
| 4870 | void |
| 4871 | arm_insert_single_step_breakpoint (struct gdbarch *gdbarch, |
| 4872 | struct address_space *aspace, |
| 4873 | CORE_ADDR pc) |
| 4874 | { |
| 4875 | struct cleanup *old_chain |
| 4876 | = make_cleanup_restore_integer (&arm_override_mode); |
| 4877 | |
| 4878 | arm_override_mode = IS_THUMB_ADDR (pc); |
| 4879 | pc = gdbarch_addr_bits_remove (gdbarch, pc); |
| 4880 | |
| 4881 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
| 4882 | |
| 4883 | do_cleanups (old_chain); |
| 4884 | } |
| 4885 | |
| 4886 | /* Checks for an atomic sequence of instructions beginning with a LDREX{,B,H,D} |
| 4887 | instruction and ending with a STREX{,B,H,D} instruction. If such a sequence |
| 4888 | is found, attempt to step through it. A breakpoint is placed at the end of |
| 4889 | the sequence. */ |
| 4890 | |
| 4891 | static int |
| 4892 | thumb_deal_with_atomic_sequence_raw (struct frame_info *frame) |
| 4893 | { |
| 4894 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 4895 | struct address_space *aspace = get_frame_address_space (frame); |
| 4896 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 4897 | CORE_ADDR pc = get_frame_pc (frame); |
| 4898 | CORE_ADDR breaks[2] = {-1, -1}; |
| 4899 | CORE_ADDR loc = pc; |
| 4900 | unsigned short insn1, insn2; |
| 4901 | int insn_count; |
| 4902 | int index; |
| 4903 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ |
| 4904 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ |
| 4905 | ULONGEST status, itstate; |
| 4906 | |
| 4907 | /* We currently do not support atomic sequences within an IT block. */ |
| 4908 | status = get_frame_register_unsigned (frame, ARM_PS_REGNUM); |
| 4909 | itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3); |
| 4910 | if (itstate & 0x0f) |
| 4911 | return 0; |
| 4912 | |
| 4913 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. */ |
| 4914 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); |
| 4915 | loc += 2; |
| 4916 | if (thumb_insn_size (insn1) != 4) |
| 4917 | return 0; |
| 4918 | |
| 4919 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); |
| 4920 | loc += 2; |
| 4921 | if (!((insn1 & 0xfff0) == 0xe850 |
| 4922 | || ((insn1 & 0xfff0) == 0xe8d0 && (insn2 & 0x00c0) == 0x0040))) |
| 4923 | return 0; |
| 4924 | |
| 4925 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" |
| 4926 | instructions. */ |
| 4927 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) |
| 4928 | { |
| 4929 | insn1 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); |
| 4930 | loc += 2; |
| 4931 | |
| 4932 | if (thumb_insn_size (insn1) != 4) |
| 4933 | { |
| 4934 | /* Assume that there is at most one conditional branch in the |
| 4935 | atomic sequence. If a conditional branch is found, put a |
| 4936 | breakpoint in its destination address. */ |
| 4937 | if ((insn1 & 0xf000) == 0xd000 && bits (insn1, 8, 11) != 0x0f) |
| 4938 | { |
| 4939 | if (last_breakpoint > 0) |
| 4940 | return 0; /* More than one conditional branch found, |
| 4941 | fallback to the standard code. */ |
| 4942 | |
| 4943 | breaks[1] = loc + 2 + (sbits (insn1, 0, 7) << 1); |
| 4944 | last_breakpoint++; |
| 4945 | } |
| 4946 | |
| 4947 | /* We do not support atomic sequences that use any *other* |
| 4948 | instructions but conditional branches to change the PC. |
| 4949 | Fall back to standard code to avoid losing control of |
| 4950 | execution. */ |
| 4951 | else if (thumb_instruction_changes_pc (insn1)) |
| 4952 | return 0; |
| 4953 | } |
| 4954 | else |
| 4955 | { |
| 4956 | insn2 = read_memory_unsigned_integer (loc, 2, byte_order_for_code); |
| 4957 | loc += 2; |
| 4958 | |
| 4959 | /* Assume that there is at most one conditional branch in the |
| 4960 | atomic sequence. If a conditional branch is found, put a |
| 4961 | breakpoint in its destination address. */ |
| 4962 | if ((insn1 & 0xf800) == 0xf000 |
| 4963 | && (insn2 & 0xd000) == 0x8000 |
| 4964 | && (insn1 & 0x0380) != 0x0380) |
| 4965 | { |
| 4966 | int sign, j1, j2, imm1, imm2; |
| 4967 | unsigned int offset; |
| 4968 | |
| 4969 | sign = sbits (insn1, 10, 10); |
| 4970 | imm1 = bits (insn1, 0, 5); |
| 4971 | imm2 = bits (insn2, 0, 10); |
| 4972 | j1 = bit (insn2, 13); |
| 4973 | j2 = bit (insn2, 11); |
| 4974 | |
| 4975 | offset = (sign << 20) + (j2 << 19) + (j1 << 18); |
| 4976 | offset += (imm1 << 12) + (imm2 << 1); |
| 4977 | |
| 4978 | if (last_breakpoint > 0) |
| 4979 | return 0; /* More than one conditional branch found, |
| 4980 | fallback to the standard code. */ |
| 4981 | |
| 4982 | breaks[1] = loc + offset; |
| 4983 | last_breakpoint++; |
| 4984 | } |
| 4985 | |
| 4986 | /* We do not support atomic sequences that use any *other* |
| 4987 | instructions but conditional branches to change the PC. |
| 4988 | Fall back to standard code to avoid losing control of |
| 4989 | execution. */ |
| 4990 | else if (thumb2_instruction_changes_pc (insn1, insn2)) |
| 4991 | return 0; |
| 4992 | |
| 4993 | /* If we find a strex{,b,h,d}, we're done. */ |
| 4994 | if ((insn1 & 0xfff0) == 0xe840 |
| 4995 | || ((insn1 & 0xfff0) == 0xe8c0 && (insn2 & 0x00c0) == 0x0040)) |
| 4996 | break; |
| 4997 | } |
| 4998 | } |
| 4999 | |
| 5000 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ |
| 5001 | if (insn_count == atomic_sequence_length) |
| 5002 | return 0; |
| 5003 | |
| 5004 | /* Insert a breakpoint right after the end of the atomic sequence. */ |
| 5005 | breaks[0] = loc; |
| 5006 | |
| 5007 | /* Check for duplicated breakpoints. Check also for a breakpoint |
| 5008 | placed (branch instruction's destination) anywhere in sequence. */ |
| 5009 | if (last_breakpoint |
| 5010 | && (breaks[1] == breaks[0] |
| 5011 | || (breaks[1] >= pc && breaks[1] < loc))) |
| 5012 | last_breakpoint = 0; |
| 5013 | |
| 5014 | /* Effectively inserts the breakpoints. */ |
| 5015 | for (index = 0; index <= last_breakpoint; index++) |
| 5016 | arm_insert_single_step_breakpoint (gdbarch, aspace, |
| 5017 | MAKE_THUMB_ADDR (breaks[index])); |
| 5018 | |
| 5019 | return 1; |
| 5020 | } |
| 5021 | |
| 5022 | static int |
| 5023 | arm_deal_with_atomic_sequence_raw (struct frame_info *frame) |
| 5024 | { |
| 5025 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 5026 | struct address_space *aspace = get_frame_address_space (frame); |
| 5027 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 5028 | CORE_ADDR pc = get_frame_pc (frame); |
| 5029 | CORE_ADDR breaks[2] = {-1, -1}; |
| 5030 | CORE_ADDR loc = pc; |
| 5031 | unsigned int insn; |
| 5032 | int insn_count; |
| 5033 | int index; |
| 5034 | int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed). */ |
| 5035 | const int atomic_sequence_length = 16; /* Instruction sequence length. */ |
| 5036 | |
| 5037 | /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction. |
| 5038 | Note that we do not currently support conditionally executed atomic |
| 5039 | instructions. */ |
| 5040 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); |
| 5041 | loc += 4; |
| 5042 | if ((insn & 0xff9000f0) != 0xe1900090) |
| 5043 | return 0; |
| 5044 | |
| 5045 | /* Assume that no atomic sequence is longer than "atomic_sequence_length" |
| 5046 | instructions. */ |
| 5047 | for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count) |
| 5048 | { |
| 5049 | insn = read_memory_unsigned_integer (loc, 4, byte_order_for_code); |
| 5050 | loc += 4; |
| 5051 | |
| 5052 | /* Assume that there is at most one conditional branch in the atomic |
| 5053 | sequence. If a conditional branch is found, put a breakpoint in |
| 5054 | its destination address. */ |
| 5055 | if (bits (insn, 24, 27) == 0xa) |
| 5056 | { |
| 5057 | if (last_breakpoint > 0) |
| 5058 | return 0; /* More than one conditional branch found, fallback |
| 5059 | to the standard single-step code. */ |
| 5060 | |
| 5061 | breaks[1] = BranchDest (loc - 4, insn); |
| 5062 | last_breakpoint++; |
| 5063 | } |
| 5064 | |
| 5065 | /* We do not support atomic sequences that use any *other* instructions |
| 5066 | but conditional branches to change the PC. Fall back to standard |
| 5067 | code to avoid losing control of execution. */ |
| 5068 | else if (arm_instruction_changes_pc (insn)) |
| 5069 | return 0; |
| 5070 | |
| 5071 | /* If we find a strex{,b,h,d}, we're done. */ |
| 5072 | if ((insn & 0xff9000f0) == 0xe1800090) |
| 5073 | break; |
| 5074 | } |
| 5075 | |
| 5076 | /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence. */ |
| 5077 | if (insn_count == atomic_sequence_length) |
| 5078 | return 0; |
| 5079 | |
| 5080 | /* Insert a breakpoint right after the end of the atomic sequence. */ |
| 5081 | breaks[0] = loc; |
| 5082 | |
| 5083 | /* Check for duplicated breakpoints. Check also for a breakpoint |
| 5084 | placed (branch instruction's destination) anywhere in sequence. */ |
| 5085 | if (last_breakpoint |
| 5086 | && (breaks[1] == breaks[0] |
| 5087 | || (breaks[1] >= pc && breaks[1] < loc))) |
| 5088 | last_breakpoint = 0; |
| 5089 | |
| 5090 | /* Effectively inserts the breakpoints. */ |
| 5091 | for (index = 0; index <= last_breakpoint; index++) |
| 5092 | arm_insert_single_step_breakpoint (gdbarch, aspace, breaks[index]); |
| 5093 | |
| 5094 | return 1; |
| 5095 | } |
| 5096 | |
| 5097 | int |
| 5098 | arm_deal_with_atomic_sequence (struct frame_info *frame) |
| 5099 | { |
| 5100 | if (arm_frame_is_thumb (frame)) |
| 5101 | return thumb_deal_with_atomic_sequence_raw (frame); |
| 5102 | else |
| 5103 | return arm_deal_with_atomic_sequence_raw (frame); |
| 5104 | } |
| 5105 | |
| 5106 | /* single_step() is called just before we want to resume the inferior, |
| 5107 | if we want to single-step it but there is no hardware or kernel |
| 5108 | single-step support. We find the target of the coming instruction |
| 5109 | and breakpoint it. */ |
| 5110 | |
| 5111 | int |
| 5112 | arm_software_single_step (struct frame_info *frame) |
| 5113 | { |
| 5114 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 5115 | struct address_space *aspace = get_frame_address_space (frame); |
| 5116 | CORE_ADDR next_pc; |
| 5117 | |
| 5118 | if (arm_deal_with_atomic_sequence (frame)) |
| 5119 | return 1; |
| 5120 | |
| 5121 | next_pc = arm_get_next_pc (frame, get_frame_pc (frame)); |
| 5122 | arm_insert_single_step_breakpoint (gdbarch, aspace, next_pc); |
| 5123 | |
| 5124 | return 1; |
| 5125 | } |
| 5126 | |
| 5127 | /* Given BUF, which is OLD_LEN bytes ending at ENDADDR, expand |
| 5128 | the buffer to be NEW_LEN bytes ending at ENDADDR. Return |
| 5129 | NULL if an error occurs. BUF is freed. */ |
| 5130 | |
| 5131 | static gdb_byte * |
| 5132 | extend_buffer_earlier (gdb_byte *buf, CORE_ADDR endaddr, |
| 5133 | int old_len, int new_len) |
| 5134 | { |
| 5135 | gdb_byte *new_buf, *middle; |
| 5136 | int bytes_to_read = new_len - old_len; |
| 5137 | |
| 5138 | new_buf = xmalloc (new_len); |
| 5139 | memcpy (new_buf + bytes_to_read, buf, old_len); |
| 5140 | xfree (buf); |
| 5141 | if (target_read_memory (endaddr - new_len, new_buf, bytes_to_read) != 0) |
| 5142 | { |
| 5143 | xfree (new_buf); |
| 5144 | return NULL; |
| 5145 | } |
| 5146 | return new_buf; |
| 5147 | } |
| 5148 | |
| 5149 | /* An IT block is at most the 2-byte IT instruction followed by |
| 5150 | four 4-byte instructions. The furthest back we must search to |
| 5151 | find an IT block that affects the current instruction is thus |
| 5152 | 2 + 3 * 4 == 14 bytes. */ |
| 5153 | #define MAX_IT_BLOCK_PREFIX 14 |
| 5154 | |
| 5155 | /* Use a quick scan if there are more than this many bytes of |
| 5156 | code. */ |
| 5157 | #define IT_SCAN_THRESHOLD 32 |
| 5158 | |
| 5159 | /* Adjust a breakpoint's address to move breakpoints out of IT blocks. |
| 5160 | A breakpoint in an IT block may not be hit, depending on the |
| 5161 | condition flags. */ |
| 5162 | static CORE_ADDR |
| 5163 | arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr) |
| 5164 | { |
| 5165 | gdb_byte *buf; |
| 5166 | char map_type; |
| 5167 | CORE_ADDR boundary, func_start; |
| 5168 | int buf_len, buf2_len; |
| 5169 | enum bfd_endian order = gdbarch_byte_order_for_code (gdbarch); |
| 5170 | int i, any, last_it, last_it_count; |
| 5171 | |
| 5172 | /* If we are using BKPT breakpoints, none of this is necessary. */ |
| 5173 | if (gdbarch_tdep (gdbarch)->thumb2_breakpoint == NULL) |
| 5174 | return bpaddr; |
| 5175 | |
| 5176 | /* ARM mode does not have this problem. */ |
| 5177 | if (!arm_pc_is_thumb (gdbarch, bpaddr)) |
| 5178 | return bpaddr; |
| 5179 | |
| 5180 | /* We are setting a breakpoint in Thumb code that could potentially |
| 5181 | contain an IT block. The first step is to find how much Thumb |
| 5182 | code there is; we do not need to read outside of known Thumb |
| 5183 | sequences. */ |
| 5184 | map_type = arm_find_mapping_symbol (bpaddr, &boundary); |
| 5185 | if (map_type == 0) |
| 5186 | /* Thumb-2 code must have mapping symbols to have a chance. */ |
| 5187 | return bpaddr; |
| 5188 | |
| 5189 | bpaddr = gdbarch_addr_bits_remove (gdbarch, bpaddr); |
| 5190 | |
| 5191 | if (find_pc_partial_function (bpaddr, NULL, &func_start, NULL) |
| 5192 | && func_start > boundary) |
| 5193 | boundary = func_start; |
| 5194 | |
| 5195 | /* Search for a candidate IT instruction. We have to do some fancy |
| 5196 | footwork to distinguish a real IT instruction from the second |
| 5197 | half of a 32-bit instruction, but there is no need for that if |
| 5198 | there's no candidate. */ |
| 5199 | buf_len = min (bpaddr - boundary, MAX_IT_BLOCK_PREFIX); |
| 5200 | if (buf_len == 0) |
| 5201 | /* No room for an IT instruction. */ |
| 5202 | return bpaddr; |
| 5203 | |
| 5204 | buf = xmalloc (buf_len); |
| 5205 | if (target_read_memory (bpaddr - buf_len, buf, buf_len) != 0) |
| 5206 | return bpaddr; |
| 5207 | any = 0; |
| 5208 | for (i = 0; i < buf_len; i += 2) |
| 5209 | { |
| 5210 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); |
| 5211 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) |
| 5212 | { |
| 5213 | any = 1; |
| 5214 | break; |
| 5215 | } |
| 5216 | } |
| 5217 | if (any == 0) |
| 5218 | { |
| 5219 | xfree (buf); |
| 5220 | return bpaddr; |
| 5221 | } |
| 5222 | |
| 5223 | /* OK, the code bytes before this instruction contain at least one |
| 5224 | halfword which resembles an IT instruction. We know that it's |
| 5225 | Thumb code, but there are still two possibilities. Either the |
| 5226 | halfword really is an IT instruction, or it is the second half of |
| 5227 | a 32-bit Thumb instruction. The only way we can tell is to |
| 5228 | scan forwards from a known instruction boundary. */ |
| 5229 | if (bpaddr - boundary > IT_SCAN_THRESHOLD) |
| 5230 | { |
| 5231 | int definite; |
| 5232 | |
| 5233 | /* There's a lot of code before this instruction. Start with an |
| 5234 | optimistic search; it's easy to recognize halfwords that can |
| 5235 | not be the start of a 32-bit instruction, and use that to |
| 5236 | lock on to the instruction boundaries. */ |
| 5237 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, IT_SCAN_THRESHOLD); |
| 5238 | if (buf == NULL) |
| 5239 | return bpaddr; |
| 5240 | buf_len = IT_SCAN_THRESHOLD; |
| 5241 | |
| 5242 | definite = 0; |
| 5243 | for (i = 0; i < buf_len - sizeof (buf) && ! definite; i += 2) |
| 5244 | { |
| 5245 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); |
| 5246 | if (thumb_insn_size (inst1) == 2) |
| 5247 | { |
| 5248 | definite = 1; |
| 5249 | break; |
| 5250 | } |
| 5251 | } |
| 5252 | |
| 5253 | /* At this point, if DEFINITE, BUF[I] is the first place we |
| 5254 | are sure that we know the instruction boundaries, and it is far |
| 5255 | enough from BPADDR that we could not miss an IT instruction |
| 5256 | affecting BPADDR. If ! DEFINITE, give up - start from a |
| 5257 | known boundary. */ |
| 5258 | if (! definite) |
| 5259 | { |
| 5260 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, |
| 5261 | bpaddr - boundary); |
| 5262 | if (buf == NULL) |
| 5263 | return bpaddr; |
| 5264 | buf_len = bpaddr - boundary; |
| 5265 | i = 0; |
| 5266 | } |
| 5267 | } |
| 5268 | else |
| 5269 | { |
| 5270 | buf = extend_buffer_earlier (buf, bpaddr, buf_len, bpaddr - boundary); |
| 5271 | if (buf == NULL) |
| 5272 | return bpaddr; |
| 5273 | buf_len = bpaddr - boundary; |
| 5274 | i = 0; |
| 5275 | } |
| 5276 | |
| 5277 | /* Scan forwards. Find the last IT instruction before BPADDR. */ |
| 5278 | last_it = -1; |
| 5279 | last_it_count = 0; |
| 5280 | while (i < buf_len) |
| 5281 | { |
| 5282 | unsigned short inst1 = extract_unsigned_integer (&buf[i], 2, order); |
| 5283 | last_it_count--; |
| 5284 | if ((inst1 & 0xff00) == 0xbf00 && (inst1 & 0x000f) != 0) |
| 5285 | { |
| 5286 | last_it = i; |
| 5287 | if (inst1 & 0x0001) |
| 5288 | last_it_count = 4; |
| 5289 | else if (inst1 & 0x0002) |
| 5290 | last_it_count = 3; |
| 5291 | else if (inst1 & 0x0004) |
| 5292 | last_it_count = 2; |
| 5293 | else |
| 5294 | last_it_count = 1; |
| 5295 | } |
| 5296 | i += thumb_insn_size (inst1); |
| 5297 | } |
| 5298 | |
| 5299 | xfree (buf); |
| 5300 | |
| 5301 | if (last_it == -1) |
| 5302 | /* There wasn't really an IT instruction after all. */ |
| 5303 | return bpaddr; |
| 5304 | |
| 5305 | if (last_it_count < 1) |
| 5306 | /* It was too far away. */ |
| 5307 | return bpaddr; |
| 5308 | |
| 5309 | /* This really is a trouble spot. Move the breakpoint to the IT |
| 5310 | instruction. */ |
| 5311 | return bpaddr - buf_len + last_it; |
| 5312 | } |
| 5313 | |
| 5314 | /* ARM displaced stepping support. |
| 5315 | |
| 5316 | Generally ARM displaced stepping works as follows: |
| 5317 | |
| 5318 | 1. When an instruction is to be single-stepped, it is first decoded by |
| 5319 | arm_process_displaced_insn (called from arm_displaced_step_copy_insn). |
| 5320 | Depending on the type of instruction, it is then copied to a scratch |
| 5321 | location, possibly in a modified form. The copy_* set of functions |
| 5322 | performs such modification, as necessary. A breakpoint is placed after |
| 5323 | the modified instruction in the scratch space to return control to GDB. |
| 5324 | Note in particular that instructions which modify the PC will no longer |
| 5325 | do so after modification. |
| 5326 | |
| 5327 | 2. The instruction is single-stepped, by setting the PC to the scratch |
| 5328 | location address, and resuming. Control returns to GDB when the |
| 5329 | breakpoint is hit. |
| 5330 | |
| 5331 | 3. A cleanup function (cleanup_*) is called corresponding to the copy_* |
| 5332 | function used for the current instruction. This function's job is to |
| 5333 | put the CPU/memory state back to what it would have been if the |
| 5334 | instruction had been executed unmodified in its original location. */ |
| 5335 | |
| 5336 | /* NOP instruction (mov r0, r0). */ |
| 5337 | #define ARM_NOP 0xe1a00000 |
| 5338 | #define THUMB_NOP 0x4600 |
| 5339 | |
| 5340 | /* Helper for register reads for displaced stepping. In particular, this |
| 5341 | returns the PC as it would be seen by the instruction at its original |
| 5342 | location. */ |
| 5343 | |
| 5344 | ULONGEST |
| 5345 | displaced_read_reg (struct regcache *regs, struct displaced_step_closure *dsc, |
| 5346 | int regno) |
| 5347 | { |
| 5348 | ULONGEST ret; |
| 5349 | CORE_ADDR from = dsc->insn_addr; |
| 5350 | |
| 5351 | if (regno == ARM_PC_REGNUM) |
| 5352 | { |
| 5353 | /* Compute pipeline offset: |
| 5354 | - When executing an ARM instruction, PC reads as the address of the |
| 5355 | current instruction plus 8. |
| 5356 | - When executing a Thumb instruction, PC reads as the address of the |
| 5357 | current instruction plus 4. */ |
| 5358 | |
| 5359 | if (!dsc->is_thumb) |
| 5360 | from += 8; |
| 5361 | else |
| 5362 | from += 4; |
| 5363 | |
| 5364 | if (debug_displaced) |
| 5365 | fprintf_unfiltered (gdb_stdlog, "displaced: read pc value %.8lx\n", |
| 5366 | (unsigned long) from); |
| 5367 | return (ULONGEST) from; |
| 5368 | } |
| 5369 | else |
| 5370 | { |
| 5371 | regcache_cooked_read_unsigned (regs, regno, &ret); |
| 5372 | if (debug_displaced) |
| 5373 | fprintf_unfiltered (gdb_stdlog, "displaced: read r%d value %.8lx\n", |
| 5374 | regno, (unsigned long) ret); |
| 5375 | return ret; |
| 5376 | } |
| 5377 | } |
| 5378 | |
| 5379 | static int |
| 5380 | displaced_in_arm_mode (struct regcache *regs) |
| 5381 | { |
| 5382 | ULONGEST ps; |
| 5383 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
| 5384 | |
| 5385 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
| 5386 | |
| 5387 | return (ps & t_bit) == 0; |
| 5388 | } |
| 5389 | |
| 5390 | /* Write to the PC as from a branch instruction. */ |
| 5391 | |
| 5392 | static void |
| 5393 | branch_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
| 5394 | ULONGEST val) |
| 5395 | { |
| 5396 | if (!dsc->is_thumb) |
| 5397 | /* Note: If bits 0/1 are set, this branch would be unpredictable for |
| 5398 | architecture versions < 6. */ |
| 5399 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
| 5400 | val & ~(ULONGEST) 0x3); |
| 5401 | else |
| 5402 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
| 5403 | val & ~(ULONGEST) 0x1); |
| 5404 | } |
| 5405 | |
| 5406 | /* Write to the PC as from a branch-exchange instruction. */ |
| 5407 | |
| 5408 | static void |
| 5409 | bx_write_pc (struct regcache *regs, ULONGEST val) |
| 5410 | { |
| 5411 | ULONGEST ps; |
| 5412 | ULONGEST t_bit = arm_psr_thumb_bit (get_regcache_arch (regs)); |
| 5413 | |
| 5414 | regcache_cooked_read_unsigned (regs, ARM_PS_REGNUM, &ps); |
| 5415 | |
| 5416 | if ((val & 1) == 1) |
| 5417 | { |
| 5418 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps | t_bit); |
| 5419 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffe); |
| 5420 | } |
| 5421 | else if ((val & 2) == 0) |
| 5422 | { |
| 5423 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
| 5424 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val); |
| 5425 | } |
| 5426 | else |
| 5427 | { |
| 5428 | /* Unpredictable behaviour. Try to do something sensible (switch to ARM |
| 5429 | mode, align dest to 4 bytes). */ |
| 5430 | warning (_("Single-stepping BX to non-word-aligned ARM instruction.")); |
| 5431 | regcache_cooked_write_unsigned (regs, ARM_PS_REGNUM, ps & ~t_bit); |
| 5432 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, val & 0xfffffffc); |
| 5433 | } |
| 5434 | } |
| 5435 | |
| 5436 | /* Write to the PC as if from a load instruction. */ |
| 5437 | |
| 5438 | static void |
| 5439 | load_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
| 5440 | ULONGEST val) |
| 5441 | { |
| 5442 | if (DISPLACED_STEPPING_ARCH_VERSION >= 5) |
| 5443 | bx_write_pc (regs, val); |
| 5444 | else |
| 5445 | branch_write_pc (regs, dsc, val); |
| 5446 | } |
| 5447 | |
| 5448 | /* Write to the PC as if from an ALU instruction. */ |
| 5449 | |
| 5450 | static void |
| 5451 | alu_write_pc (struct regcache *regs, struct displaced_step_closure *dsc, |
| 5452 | ULONGEST val) |
| 5453 | { |
| 5454 | if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb) |
| 5455 | bx_write_pc (regs, val); |
| 5456 | else |
| 5457 | branch_write_pc (regs, dsc, val); |
| 5458 | } |
| 5459 | |
| 5460 | /* Helper for writing to registers for displaced stepping. Writing to the PC |
| 5461 | has a varying effects depending on the instruction which does the write: |
| 5462 | this is controlled by the WRITE_PC argument. */ |
| 5463 | |
| 5464 | void |
| 5465 | displaced_write_reg (struct regcache *regs, struct displaced_step_closure *dsc, |
| 5466 | int regno, ULONGEST val, enum pc_write_style write_pc) |
| 5467 | { |
| 5468 | if (regno == ARM_PC_REGNUM) |
| 5469 | { |
| 5470 | if (debug_displaced) |
| 5471 | fprintf_unfiltered (gdb_stdlog, "displaced: writing pc %.8lx\n", |
| 5472 | (unsigned long) val); |
| 5473 | switch (write_pc) |
| 5474 | { |
| 5475 | case BRANCH_WRITE_PC: |
| 5476 | branch_write_pc (regs, dsc, val); |
| 5477 | break; |
| 5478 | |
| 5479 | case BX_WRITE_PC: |
| 5480 | bx_write_pc (regs, val); |
| 5481 | break; |
| 5482 | |
| 5483 | case LOAD_WRITE_PC: |
| 5484 | load_write_pc (regs, dsc, val); |
| 5485 | break; |
| 5486 | |
| 5487 | case ALU_WRITE_PC: |
| 5488 | alu_write_pc (regs, dsc, val); |
| 5489 | break; |
| 5490 | |
| 5491 | case CANNOT_WRITE_PC: |
| 5492 | warning (_("Instruction wrote to PC in an unexpected way when " |
| 5493 | "single-stepping")); |
| 5494 | break; |
| 5495 | |
| 5496 | default: |
| 5497 | internal_error (__FILE__, __LINE__, |
| 5498 | _("Invalid argument to displaced_write_reg")); |
| 5499 | } |
| 5500 | |
| 5501 | dsc->wrote_to_pc = 1; |
| 5502 | } |
| 5503 | else |
| 5504 | { |
| 5505 | if (debug_displaced) |
| 5506 | fprintf_unfiltered (gdb_stdlog, "displaced: writing r%d value %.8lx\n", |
| 5507 | regno, (unsigned long) val); |
| 5508 | regcache_cooked_write_unsigned (regs, regno, val); |
| 5509 | } |
| 5510 | } |
| 5511 | |
| 5512 | /* This function is used to concisely determine if an instruction INSN |
| 5513 | references PC. Register fields of interest in INSN should have the |
| 5514 | corresponding fields of BITMASK set to 0b1111. The function |
| 5515 | returns return 1 if any of these fields in INSN reference the PC |
| 5516 | (also 0b1111, r15), else it returns 0. */ |
| 5517 | |
| 5518 | static int |
| 5519 | insn_references_pc (uint32_t insn, uint32_t bitmask) |
| 5520 | { |
| 5521 | uint32_t lowbit = 1; |
| 5522 | |
| 5523 | while (bitmask != 0) |
| 5524 | { |
| 5525 | uint32_t mask; |
| 5526 | |
| 5527 | for (; lowbit && (bitmask & lowbit) == 0; lowbit <<= 1) |
| 5528 | ; |
| 5529 | |
| 5530 | if (!lowbit) |
| 5531 | break; |
| 5532 | |
| 5533 | mask = lowbit * 0xf; |
| 5534 | |
| 5535 | if ((insn & mask) == mask) |
| 5536 | return 1; |
| 5537 | |
| 5538 | bitmask &= ~mask; |
| 5539 | } |
| 5540 | |
| 5541 | return 0; |
| 5542 | } |
| 5543 | |
| 5544 | /* The simplest copy function. Many instructions have the same effect no |
| 5545 | matter what address they are executed at: in those cases, use this. */ |
| 5546 | |
| 5547 | static int |
| 5548 | arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, |
| 5549 | const char *iname, struct displaced_step_closure *dsc) |
| 5550 | { |
| 5551 | if (debug_displaced) |
| 5552 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx, " |
| 5553 | "opcode/class '%s' unmodified\n", (unsigned long) insn, |
| 5554 | iname); |
| 5555 | |
| 5556 | dsc->modinsn[0] = insn; |
| 5557 | |
| 5558 | return 0; |
| 5559 | } |
| 5560 | |
| 5561 | static int |
| 5562 | thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1, |
| 5563 | uint16_t insn2, const char *iname, |
| 5564 | struct displaced_step_closure *dsc) |
| 5565 | { |
| 5566 | if (debug_displaced) |
| 5567 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x %.4x, " |
| 5568 | "opcode/class '%s' unmodified\n", insn1, insn2, |
| 5569 | iname); |
| 5570 | |
| 5571 | dsc->modinsn[0] = insn1; |
| 5572 | dsc->modinsn[1] = insn2; |
| 5573 | dsc->numinsns = 2; |
| 5574 | |
| 5575 | return 0; |
| 5576 | } |
| 5577 | |
| 5578 | /* Copy 16-bit Thumb(Thumb and 16-bit Thumb-2) instruction without any |
| 5579 | modification. */ |
| 5580 | static int |
| 5581 | thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, unsigned int insn, |
| 5582 | const char *iname, |
| 5583 | struct displaced_step_closure *dsc) |
| 5584 | { |
| 5585 | if (debug_displaced) |
| 5586 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x, " |
| 5587 | "opcode/class '%s' unmodified\n", insn, |
| 5588 | iname); |
| 5589 | |
| 5590 | dsc->modinsn[0] = insn; |
| 5591 | |
| 5592 | return 0; |
| 5593 | } |
| 5594 | |
| 5595 | /* Preload instructions with immediate offset. */ |
| 5596 | |
| 5597 | static void |
| 5598 | cleanup_preload (struct gdbarch *gdbarch, |
| 5599 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 5600 | { |
| 5601 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
| 5602 | if (!dsc->u.preload.immed) |
| 5603 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); |
| 5604 | } |
| 5605 | |
| 5606 | static void |
| 5607 | install_preload (struct gdbarch *gdbarch, struct regcache *regs, |
| 5608 | struct displaced_step_closure *dsc, unsigned int rn) |
| 5609 | { |
| 5610 | ULONGEST rn_val; |
| 5611 | /* Preload instructions: |
| 5612 | |
| 5613 | {pli/pld} [rn, #+/-imm] |
| 5614 | -> |
| 5615 | {pli/pld} [r0, #+/-imm]. */ |
| 5616 | |
| 5617 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 5618 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 5619 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
| 5620 | dsc->u.preload.immed = 1; |
| 5621 | |
| 5622 | dsc->cleanup = &cleanup_preload; |
| 5623 | } |
| 5624 | |
| 5625 | static int |
| 5626 | arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
| 5627 | struct displaced_step_closure *dsc) |
| 5628 | { |
| 5629 | unsigned int rn = bits (insn, 16, 19); |
| 5630 | |
| 5631 | if (!insn_references_pc (insn, 0x000f0000ul)) |
| 5632 | return arm_copy_unmodified (gdbarch, insn, "preload", dsc); |
| 5633 | |
| 5634 | if (debug_displaced) |
| 5635 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", |
| 5636 | (unsigned long) insn); |
| 5637 | |
| 5638 | dsc->modinsn[0] = insn & 0xfff0ffff; |
| 5639 | |
| 5640 | install_preload (gdbarch, regs, dsc, rn); |
| 5641 | |
| 5642 | return 0; |
| 5643 | } |
| 5644 | |
| 5645 | static int |
| 5646 | thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, |
| 5647 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 5648 | { |
| 5649 | unsigned int rn = bits (insn1, 0, 3); |
| 5650 | unsigned int u_bit = bit (insn1, 7); |
| 5651 | int imm12 = bits (insn2, 0, 11); |
| 5652 | ULONGEST pc_val; |
| 5653 | |
| 5654 | if (rn != ARM_PC_REGNUM) |
| 5655 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "preload", dsc); |
| 5656 | |
| 5657 | /* PC is only allowed to use in PLI (immediate,literal) Encoding T3, and |
| 5658 | PLD (literal) Encoding T1. */ |
| 5659 | if (debug_displaced) |
| 5660 | fprintf_unfiltered (gdb_stdlog, |
| 5661 | "displaced: copying pld/pli pc (0x%x) %c imm12 %.4x\n", |
| 5662 | (unsigned int) dsc->insn_addr, u_bit ? '+' : '-', |
| 5663 | imm12); |
| 5664 | |
| 5665 | if (!u_bit) |
| 5666 | imm12 = -1 * imm12; |
| 5667 | |
| 5668 | /* Rewrite instruction {pli/pld} PC imm12 into: |
| 5669 | Prepare: tmp[0] <- r0, tmp[1] <- r1, r0 <- pc, r1 <- imm12 |
| 5670 | |
| 5671 | {pli/pld} [r0, r1] |
| 5672 | |
| 5673 | Cleanup: r0 <- tmp[0], r1 <- tmp[1]. */ |
| 5674 | |
| 5675 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 5676 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); |
| 5677 | |
| 5678 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); |
| 5679 | |
| 5680 | displaced_write_reg (regs, dsc, 0, pc_val, CANNOT_WRITE_PC); |
| 5681 | displaced_write_reg (regs, dsc, 1, imm12, CANNOT_WRITE_PC); |
| 5682 | dsc->u.preload.immed = 0; |
| 5683 | |
| 5684 | /* {pli/pld} [r0, r1] */ |
| 5685 | dsc->modinsn[0] = insn1 & 0xfff0; |
| 5686 | dsc->modinsn[1] = 0xf001; |
| 5687 | dsc->numinsns = 2; |
| 5688 | |
| 5689 | dsc->cleanup = &cleanup_preload; |
| 5690 | return 0; |
| 5691 | } |
| 5692 | |
| 5693 | /* Preload instructions with register offset. */ |
| 5694 | |
| 5695 | static void |
| 5696 | install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs, |
| 5697 | struct displaced_step_closure *dsc, unsigned int rn, |
| 5698 | unsigned int rm) |
| 5699 | { |
| 5700 | ULONGEST rn_val, rm_val; |
| 5701 | |
| 5702 | /* Preload register-offset instructions: |
| 5703 | |
| 5704 | {pli/pld} [rn, rm {, shift}] |
| 5705 | -> |
| 5706 | {pli/pld} [r0, r1 {, shift}]. */ |
| 5707 | |
| 5708 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 5709 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); |
| 5710 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 5711 | rm_val = displaced_read_reg (regs, dsc, rm); |
| 5712 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
| 5713 | displaced_write_reg (regs, dsc, 1, rm_val, CANNOT_WRITE_PC); |
| 5714 | dsc->u.preload.immed = 0; |
| 5715 | |
| 5716 | dsc->cleanup = &cleanup_preload; |
| 5717 | } |
| 5718 | |
| 5719 | static int |
| 5720 | arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn, |
| 5721 | struct regcache *regs, |
| 5722 | struct displaced_step_closure *dsc) |
| 5723 | { |
| 5724 | unsigned int rn = bits (insn, 16, 19); |
| 5725 | unsigned int rm = bits (insn, 0, 3); |
| 5726 | |
| 5727 | |
| 5728 | if (!insn_references_pc (insn, 0x000f000ful)) |
| 5729 | return arm_copy_unmodified (gdbarch, insn, "preload reg", dsc); |
| 5730 | |
| 5731 | if (debug_displaced) |
| 5732 | fprintf_unfiltered (gdb_stdlog, "displaced: copying preload insn %.8lx\n", |
| 5733 | (unsigned long) insn); |
| 5734 | |
| 5735 | dsc->modinsn[0] = (insn & 0xfff0fff0) | 0x1; |
| 5736 | |
| 5737 | install_preload_reg (gdbarch, regs, dsc, rn, rm); |
| 5738 | return 0; |
| 5739 | } |
| 5740 | |
| 5741 | /* Copy/cleanup coprocessor load and store instructions. */ |
| 5742 | |
| 5743 | static void |
| 5744 | cleanup_copro_load_store (struct gdbarch *gdbarch, |
| 5745 | struct regcache *regs, |
| 5746 | struct displaced_step_closure *dsc) |
| 5747 | { |
| 5748 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 0); |
| 5749 | |
| 5750 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
| 5751 | |
| 5752 | if (dsc->u.ldst.writeback) |
| 5753 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, LOAD_WRITE_PC); |
| 5754 | } |
| 5755 | |
| 5756 | static void |
| 5757 | install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs, |
| 5758 | struct displaced_step_closure *dsc, |
| 5759 | int writeback, unsigned int rn) |
| 5760 | { |
| 5761 | ULONGEST rn_val; |
| 5762 | |
| 5763 | /* Coprocessor load/store instructions: |
| 5764 | |
| 5765 | {stc/stc2} [<Rn>, #+/-imm] (and other immediate addressing modes) |
| 5766 | -> |
| 5767 | {stc/stc2} [r0, #+/-imm]. |
| 5768 | |
| 5769 | ldc/ldc2 are handled identically. */ |
| 5770 | |
| 5771 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 5772 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 5773 | /* PC should be 4-byte aligned. */ |
| 5774 | rn_val = rn_val & 0xfffffffc; |
| 5775 | displaced_write_reg (regs, dsc, 0, rn_val, CANNOT_WRITE_PC); |
| 5776 | |
| 5777 | dsc->u.ldst.writeback = writeback; |
| 5778 | dsc->u.ldst.rn = rn; |
| 5779 | |
| 5780 | dsc->cleanup = &cleanup_copro_load_store; |
| 5781 | } |
| 5782 | |
| 5783 | static int |
| 5784 | arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn, |
| 5785 | struct regcache *regs, |
| 5786 | struct displaced_step_closure *dsc) |
| 5787 | { |
| 5788 | unsigned int rn = bits (insn, 16, 19); |
| 5789 | |
| 5790 | if (!insn_references_pc (insn, 0x000f0000ul)) |
| 5791 | return arm_copy_unmodified (gdbarch, insn, "copro load/store", dsc); |
| 5792 | |
| 5793 | if (debug_displaced) |
| 5794 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " |
| 5795 | "load/store insn %.8lx\n", (unsigned long) insn); |
| 5796 | |
| 5797 | dsc->modinsn[0] = insn & 0xfff0ffff; |
| 5798 | |
| 5799 | install_copro_load_store (gdbarch, regs, dsc, bit (insn, 25), rn); |
| 5800 | |
| 5801 | return 0; |
| 5802 | } |
| 5803 | |
| 5804 | static int |
| 5805 | thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1, |
| 5806 | uint16_t insn2, struct regcache *regs, |
| 5807 | struct displaced_step_closure *dsc) |
| 5808 | { |
| 5809 | unsigned int rn = bits (insn1, 0, 3); |
| 5810 | |
| 5811 | if (rn != ARM_PC_REGNUM) |
| 5812 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 5813 | "copro load/store", dsc); |
| 5814 | |
| 5815 | if (debug_displaced) |
| 5816 | fprintf_unfiltered (gdb_stdlog, "displaced: copying coprocessor " |
| 5817 | "load/store insn %.4x%.4x\n", insn1, insn2); |
| 5818 | |
| 5819 | dsc->modinsn[0] = insn1 & 0xfff0; |
| 5820 | dsc->modinsn[1] = insn2; |
| 5821 | dsc->numinsns = 2; |
| 5822 | |
| 5823 | /* This function is called for copying instruction LDC/LDC2/VLDR, which |
| 5824 | doesn't support writeback, so pass 0. */ |
| 5825 | install_copro_load_store (gdbarch, regs, dsc, 0, rn); |
| 5826 | |
| 5827 | return 0; |
| 5828 | } |
| 5829 | |
| 5830 | /* Clean up branch instructions (actually perform the branch, by setting |
| 5831 | PC). */ |
| 5832 | |
| 5833 | static void |
| 5834 | cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs, |
| 5835 | struct displaced_step_closure *dsc) |
| 5836 | { |
| 5837 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
| 5838 | int branch_taken = condition_true (dsc->u.branch.cond, status); |
| 5839 | enum pc_write_style write_pc = dsc->u.branch.exchange |
| 5840 | ? BX_WRITE_PC : BRANCH_WRITE_PC; |
| 5841 | |
| 5842 | if (!branch_taken) |
| 5843 | return; |
| 5844 | |
| 5845 | if (dsc->u.branch.link) |
| 5846 | { |
| 5847 | /* The value of LR should be the next insn of current one. In order |
| 5848 | not to confuse logic hanlding later insn `bx lr', if current insn mode |
| 5849 | is Thumb, the bit 0 of LR value should be set to 1. */ |
| 5850 | ULONGEST next_insn_addr = dsc->insn_addr + dsc->insn_size; |
| 5851 | |
| 5852 | if (dsc->is_thumb) |
| 5853 | next_insn_addr |= 0x1; |
| 5854 | |
| 5855 | displaced_write_reg (regs, dsc, ARM_LR_REGNUM, next_insn_addr, |
| 5856 | CANNOT_WRITE_PC); |
| 5857 | } |
| 5858 | |
| 5859 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->u.branch.dest, write_pc); |
| 5860 | } |
| 5861 | |
| 5862 | /* Copy B/BL/BLX instructions with immediate destinations. */ |
| 5863 | |
| 5864 | static void |
| 5865 | install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs, |
| 5866 | struct displaced_step_closure *dsc, |
| 5867 | unsigned int cond, int exchange, int link, long offset) |
| 5868 | { |
| 5869 | /* Implement "BL<cond> <label>" as: |
| 5870 | |
| 5871 | Preparation: cond <- instruction condition |
| 5872 | Insn: mov r0, r0 (nop) |
| 5873 | Cleanup: if (condition true) { r14 <- pc; pc <- label }. |
| 5874 | |
| 5875 | B<cond> similar, but don't set r14 in cleanup. */ |
| 5876 | |
| 5877 | dsc->u.branch.cond = cond; |
| 5878 | dsc->u.branch.link = link; |
| 5879 | dsc->u.branch.exchange = exchange; |
| 5880 | |
| 5881 | dsc->u.branch.dest = dsc->insn_addr; |
| 5882 | if (link && exchange) |
| 5883 | /* For BLX, offset is computed from the Align (PC, 4). */ |
| 5884 | dsc->u.branch.dest = dsc->u.branch.dest & 0xfffffffc; |
| 5885 | |
| 5886 | if (dsc->is_thumb) |
| 5887 | dsc->u.branch.dest += 4 + offset; |
| 5888 | else |
| 5889 | dsc->u.branch.dest += 8 + offset; |
| 5890 | |
| 5891 | dsc->cleanup = &cleanup_branch; |
| 5892 | } |
| 5893 | static int |
| 5894 | arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn, |
| 5895 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 5896 | { |
| 5897 | unsigned int cond = bits (insn, 28, 31); |
| 5898 | int exchange = (cond == 0xf); |
| 5899 | int link = exchange || bit (insn, 24); |
| 5900 | long offset; |
| 5901 | |
| 5902 | if (debug_displaced) |
| 5903 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s immediate insn " |
| 5904 | "%.8lx\n", (exchange) ? "blx" : (link) ? "bl" : "b", |
| 5905 | (unsigned long) insn); |
| 5906 | if (exchange) |
| 5907 | /* For BLX, set bit 0 of the destination. The cleanup_branch function will |
| 5908 | then arrange the switch into Thumb mode. */ |
| 5909 | offset = (bits (insn, 0, 23) << 2) | (bit (insn, 24) << 1) | 1; |
| 5910 | else |
| 5911 | offset = bits (insn, 0, 23) << 2; |
| 5912 | |
| 5913 | if (bit (offset, 25)) |
| 5914 | offset = offset | ~0x3ffffff; |
| 5915 | |
| 5916 | dsc->modinsn[0] = ARM_NOP; |
| 5917 | |
| 5918 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); |
| 5919 | return 0; |
| 5920 | } |
| 5921 | |
| 5922 | static int |
| 5923 | thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1, |
| 5924 | uint16_t insn2, struct regcache *regs, |
| 5925 | struct displaced_step_closure *dsc) |
| 5926 | { |
| 5927 | int link = bit (insn2, 14); |
| 5928 | int exchange = link && !bit (insn2, 12); |
| 5929 | int cond = INST_AL; |
| 5930 | long offset = 0; |
| 5931 | int j1 = bit (insn2, 13); |
| 5932 | int j2 = bit (insn2, 11); |
| 5933 | int s = sbits (insn1, 10, 10); |
| 5934 | int i1 = !(j1 ^ bit (insn1, 10)); |
| 5935 | int i2 = !(j2 ^ bit (insn1, 10)); |
| 5936 | |
| 5937 | if (!link && !exchange) /* B */ |
| 5938 | { |
| 5939 | offset = (bits (insn2, 0, 10) << 1); |
| 5940 | if (bit (insn2, 12)) /* Encoding T4 */ |
| 5941 | { |
| 5942 | offset |= (bits (insn1, 0, 9) << 12) |
| 5943 | | (i2 << 22) |
| 5944 | | (i1 << 23) |
| 5945 | | (s << 24); |
| 5946 | cond = INST_AL; |
| 5947 | } |
| 5948 | else /* Encoding T3 */ |
| 5949 | { |
| 5950 | offset |= (bits (insn1, 0, 5) << 12) |
| 5951 | | (j1 << 18) |
| 5952 | | (j2 << 19) |
| 5953 | | (s << 20); |
| 5954 | cond = bits (insn1, 6, 9); |
| 5955 | } |
| 5956 | } |
| 5957 | else |
| 5958 | { |
| 5959 | offset = (bits (insn1, 0, 9) << 12); |
| 5960 | offset |= ((i2 << 22) | (i1 << 23) | (s << 24)); |
| 5961 | offset |= exchange ? |
| 5962 | (bits (insn2, 1, 10) << 2) : (bits (insn2, 0, 10) << 1); |
| 5963 | } |
| 5964 | |
| 5965 | if (debug_displaced) |
| 5966 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s insn " |
| 5967 | "%.4x %.4x with offset %.8lx\n", |
| 5968 | link ? (exchange) ? "blx" : "bl" : "b", |
| 5969 | insn1, insn2, offset); |
| 5970 | |
| 5971 | dsc->modinsn[0] = THUMB_NOP; |
| 5972 | |
| 5973 | install_b_bl_blx (gdbarch, regs, dsc, cond, exchange, link, offset); |
| 5974 | return 0; |
| 5975 | } |
| 5976 | |
| 5977 | /* Copy B Thumb instructions. */ |
| 5978 | static int |
| 5979 | thumb_copy_b (struct gdbarch *gdbarch, unsigned short insn, |
| 5980 | struct displaced_step_closure *dsc) |
| 5981 | { |
| 5982 | unsigned int cond = 0; |
| 5983 | int offset = 0; |
| 5984 | unsigned short bit_12_15 = bits (insn, 12, 15); |
| 5985 | CORE_ADDR from = dsc->insn_addr; |
| 5986 | |
| 5987 | if (bit_12_15 == 0xd) |
| 5988 | { |
| 5989 | /* offset = SignExtend (imm8:0, 32) */ |
| 5990 | offset = sbits ((insn << 1), 0, 8); |
| 5991 | cond = bits (insn, 8, 11); |
| 5992 | } |
| 5993 | else if (bit_12_15 == 0xe) /* Encoding T2 */ |
| 5994 | { |
| 5995 | offset = sbits ((insn << 1), 0, 11); |
| 5996 | cond = INST_AL; |
| 5997 | } |
| 5998 | |
| 5999 | if (debug_displaced) |
| 6000 | fprintf_unfiltered (gdb_stdlog, |
| 6001 | "displaced: copying b immediate insn %.4x " |
| 6002 | "with offset %d\n", insn, offset); |
| 6003 | |
| 6004 | dsc->u.branch.cond = cond; |
| 6005 | dsc->u.branch.link = 0; |
| 6006 | dsc->u.branch.exchange = 0; |
| 6007 | dsc->u.branch.dest = from + 4 + offset; |
| 6008 | |
| 6009 | dsc->modinsn[0] = THUMB_NOP; |
| 6010 | |
| 6011 | dsc->cleanup = &cleanup_branch; |
| 6012 | |
| 6013 | return 0; |
| 6014 | } |
| 6015 | |
| 6016 | /* Copy BX/BLX with register-specified destinations. */ |
| 6017 | |
| 6018 | static void |
| 6019 | install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs, |
| 6020 | struct displaced_step_closure *dsc, int link, |
| 6021 | unsigned int cond, unsigned int rm) |
| 6022 | { |
| 6023 | /* Implement {BX,BLX}<cond> <reg>" as: |
| 6024 | |
| 6025 | Preparation: cond <- instruction condition |
| 6026 | Insn: mov r0, r0 (nop) |
| 6027 | Cleanup: if (condition true) { r14 <- pc; pc <- dest; }. |
| 6028 | |
| 6029 | Don't set r14 in cleanup for BX. */ |
| 6030 | |
| 6031 | dsc->u.branch.dest = displaced_read_reg (regs, dsc, rm); |
| 6032 | |
| 6033 | dsc->u.branch.cond = cond; |
| 6034 | dsc->u.branch.link = link; |
| 6035 | |
| 6036 | dsc->u.branch.exchange = 1; |
| 6037 | |
| 6038 | dsc->cleanup = &cleanup_branch; |
| 6039 | } |
| 6040 | |
| 6041 | static int |
| 6042 | arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn, |
| 6043 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 6044 | { |
| 6045 | unsigned int cond = bits (insn, 28, 31); |
| 6046 | /* BX: x12xxx1x |
| 6047 | BLX: x12xxx3x. */ |
| 6048 | int link = bit (insn, 5); |
| 6049 | unsigned int rm = bits (insn, 0, 3); |
| 6050 | |
| 6051 | if (debug_displaced) |
| 6052 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.8lx", |
| 6053 | (unsigned long) insn); |
| 6054 | |
| 6055 | dsc->modinsn[0] = ARM_NOP; |
| 6056 | |
| 6057 | install_bx_blx_reg (gdbarch, regs, dsc, link, cond, rm); |
| 6058 | return 0; |
| 6059 | } |
| 6060 | |
| 6061 | static int |
| 6062 | thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn, |
| 6063 | struct regcache *regs, |
| 6064 | struct displaced_step_closure *dsc) |
| 6065 | { |
| 6066 | int link = bit (insn, 7); |
| 6067 | unsigned int rm = bits (insn, 3, 6); |
| 6068 | |
| 6069 | if (debug_displaced) |
| 6070 | fprintf_unfiltered (gdb_stdlog, "displaced: copying insn %.4x", |
| 6071 | (unsigned short) insn); |
| 6072 | |
| 6073 | dsc->modinsn[0] = THUMB_NOP; |
| 6074 | |
| 6075 | install_bx_blx_reg (gdbarch, regs, dsc, link, INST_AL, rm); |
| 6076 | |
| 6077 | return 0; |
| 6078 | } |
| 6079 | |
| 6080 | |
| 6081 | /* Copy/cleanup arithmetic/logic instruction with immediate RHS. */ |
| 6082 | |
| 6083 | static void |
| 6084 | cleanup_alu_imm (struct gdbarch *gdbarch, |
| 6085 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 6086 | { |
| 6087 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
| 6088 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
| 6089 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); |
| 6090 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); |
| 6091 | } |
| 6092 | |
| 6093 | static int |
| 6094 | arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
| 6095 | struct displaced_step_closure *dsc) |
| 6096 | { |
| 6097 | unsigned int rn = bits (insn, 16, 19); |
| 6098 | unsigned int rd = bits (insn, 12, 15); |
| 6099 | unsigned int op = bits (insn, 21, 24); |
| 6100 | int is_mov = (op == 0xd); |
| 6101 | ULONGEST rd_val, rn_val; |
| 6102 | |
| 6103 | if (!insn_references_pc (insn, 0x000ff000ul)) |
| 6104 | return arm_copy_unmodified (gdbarch, insn, "ALU immediate", dsc); |
| 6105 | |
| 6106 | if (debug_displaced) |
| 6107 | fprintf_unfiltered (gdb_stdlog, "displaced: copying immediate %s insn " |
| 6108 | "%.8lx\n", is_mov ? "move" : "ALU", |
| 6109 | (unsigned long) insn); |
| 6110 | |
| 6111 | /* Instruction is of form: |
| 6112 | |
| 6113 | <op><cond> rd, [rn,] #imm |
| 6114 | |
| 6115 | Rewrite as: |
| 6116 | |
| 6117 | Preparation: tmp1, tmp2 <- r0, r1; |
| 6118 | r0, r1 <- rd, rn |
| 6119 | Insn: <op><cond> r0, r1, #imm |
| 6120 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 |
| 6121 | */ |
| 6122 | |
| 6123 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 6124 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); |
| 6125 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 6126 | rd_val = displaced_read_reg (regs, dsc, rd); |
| 6127 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
| 6128 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); |
| 6129 | dsc->rd = rd; |
| 6130 | |
| 6131 | if (is_mov) |
| 6132 | dsc->modinsn[0] = insn & 0xfff00fff; |
| 6133 | else |
| 6134 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x10000; |
| 6135 | |
| 6136 | dsc->cleanup = &cleanup_alu_imm; |
| 6137 | |
| 6138 | return 0; |
| 6139 | } |
| 6140 | |
| 6141 | static int |
| 6142 | thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1, |
| 6143 | uint16_t insn2, struct regcache *regs, |
| 6144 | struct displaced_step_closure *dsc) |
| 6145 | { |
| 6146 | unsigned int op = bits (insn1, 5, 8); |
| 6147 | unsigned int rn, rm, rd; |
| 6148 | ULONGEST rd_val, rn_val; |
| 6149 | |
| 6150 | rn = bits (insn1, 0, 3); /* Rn */ |
| 6151 | rm = bits (insn2, 0, 3); /* Rm */ |
| 6152 | rd = bits (insn2, 8, 11); /* Rd */ |
| 6153 | |
| 6154 | /* This routine is only called for instruction MOV. */ |
| 6155 | gdb_assert (op == 0x2 && rn == 0xf); |
| 6156 | |
| 6157 | if (rm != ARM_PC_REGNUM && rd != ARM_PC_REGNUM) |
| 6158 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ALU imm", dsc); |
| 6159 | |
| 6160 | if (debug_displaced) |
| 6161 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x%.4x\n", |
| 6162 | "ALU", insn1, insn2); |
| 6163 | |
| 6164 | /* Instruction is of form: |
| 6165 | |
| 6166 | <op><cond> rd, [rn,] #imm |
| 6167 | |
| 6168 | Rewrite as: |
| 6169 | |
| 6170 | Preparation: tmp1, tmp2 <- r0, r1; |
| 6171 | r0, r1 <- rd, rn |
| 6172 | Insn: <op><cond> r0, r1, #imm |
| 6173 | Cleanup: rd <- r0; r0 <- tmp1; r1 <- tmp2 |
| 6174 | */ |
| 6175 | |
| 6176 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 6177 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); |
| 6178 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 6179 | rd_val = displaced_read_reg (regs, dsc, rd); |
| 6180 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
| 6181 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); |
| 6182 | dsc->rd = rd; |
| 6183 | |
| 6184 | dsc->modinsn[0] = insn1; |
| 6185 | dsc->modinsn[1] = ((insn2 & 0xf0f0) | 0x1); |
| 6186 | dsc->numinsns = 2; |
| 6187 | |
| 6188 | dsc->cleanup = &cleanup_alu_imm; |
| 6189 | |
| 6190 | return 0; |
| 6191 | } |
| 6192 | |
| 6193 | /* Copy/cleanup arithmetic/logic insns with register RHS. */ |
| 6194 | |
| 6195 | static void |
| 6196 | cleanup_alu_reg (struct gdbarch *gdbarch, |
| 6197 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 6198 | { |
| 6199 | ULONGEST rd_val; |
| 6200 | int i; |
| 6201 | |
| 6202 | rd_val = displaced_read_reg (regs, dsc, 0); |
| 6203 | |
| 6204 | for (i = 0; i < 3; i++) |
| 6205 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); |
| 6206 | |
| 6207 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); |
| 6208 | } |
| 6209 | |
| 6210 | static void |
| 6211 | install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs, |
| 6212 | struct displaced_step_closure *dsc, |
| 6213 | unsigned int rd, unsigned int rn, unsigned int rm) |
| 6214 | { |
| 6215 | ULONGEST rd_val, rn_val, rm_val; |
| 6216 | |
| 6217 | /* Instruction is of form: |
| 6218 | |
| 6219 | <op><cond> rd, [rn,] rm [, <shift>] |
| 6220 | |
| 6221 | Rewrite as: |
| 6222 | |
| 6223 | Preparation: tmp1, tmp2, tmp3 <- r0, r1, r2; |
| 6224 | r0, r1, r2 <- rd, rn, rm |
| 6225 | Insn: <op><cond> r0, r1, r2 [, <shift>] |
| 6226 | Cleanup: rd <- r0; r0, r1, r2 <- tmp1, tmp2, tmp3 |
| 6227 | */ |
| 6228 | |
| 6229 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 6230 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); |
| 6231 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); |
| 6232 | rd_val = displaced_read_reg (regs, dsc, rd); |
| 6233 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 6234 | rm_val = displaced_read_reg (regs, dsc, rm); |
| 6235 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
| 6236 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); |
| 6237 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); |
| 6238 | dsc->rd = rd; |
| 6239 | |
| 6240 | dsc->cleanup = &cleanup_alu_reg; |
| 6241 | } |
| 6242 | |
| 6243 | static int |
| 6244 | arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs, |
| 6245 | struct displaced_step_closure *dsc) |
| 6246 | { |
| 6247 | unsigned int op = bits (insn, 21, 24); |
| 6248 | int is_mov = (op == 0xd); |
| 6249 | |
| 6250 | if (!insn_references_pc (insn, 0x000ff00ful)) |
| 6251 | return arm_copy_unmodified (gdbarch, insn, "ALU reg", dsc); |
| 6252 | |
| 6253 | if (debug_displaced) |
| 6254 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.8lx\n", |
| 6255 | is_mov ? "move" : "ALU", (unsigned long) insn); |
| 6256 | |
| 6257 | if (is_mov) |
| 6258 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x2; |
| 6259 | else |
| 6260 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x10002; |
| 6261 | |
| 6262 | install_alu_reg (gdbarch, regs, dsc, bits (insn, 12, 15), bits (insn, 16, 19), |
| 6263 | bits (insn, 0, 3)); |
| 6264 | return 0; |
| 6265 | } |
| 6266 | |
| 6267 | static int |
| 6268 | thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn, |
| 6269 | struct regcache *regs, |
| 6270 | struct displaced_step_closure *dsc) |
| 6271 | { |
| 6272 | unsigned rn, rm, rd; |
| 6273 | |
| 6274 | rd = bits (insn, 3, 6); |
| 6275 | rn = (bit (insn, 7) << 3) | bits (insn, 0, 2); |
| 6276 | rm = 2; |
| 6277 | |
| 6278 | if (rd != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) |
| 6279 | return thumb_copy_unmodified_16bit (gdbarch, insn, "ALU reg", dsc); |
| 6280 | |
| 6281 | if (debug_displaced) |
| 6282 | fprintf_unfiltered (gdb_stdlog, "displaced: copying reg %s insn %.4x\n", |
| 6283 | "ALU", (unsigned short) insn); |
| 6284 | |
| 6285 | dsc->modinsn[0] = ((insn & 0xff00) | 0x08); |
| 6286 | |
| 6287 | install_alu_reg (gdbarch, regs, dsc, rd, rn, rm); |
| 6288 | |
| 6289 | return 0; |
| 6290 | } |
| 6291 | |
| 6292 | /* Cleanup/copy arithmetic/logic insns with shifted register RHS. */ |
| 6293 | |
| 6294 | static void |
| 6295 | cleanup_alu_shifted_reg (struct gdbarch *gdbarch, |
| 6296 | struct regcache *regs, |
| 6297 | struct displaced_step_closure *dsc) |
| 6298 | { |
| 6299 | ULONGEST rd_val = displaced_read_reg (regs, dsc, 0); |
| 6300 | int i; |
| 6301 | |
| 6302 | for (i = 0; i < 4; i++) |
| 6303 | displaced_write_reg (regs, dsc, i, dsc->tmp[i], CANNOT_WRITE_PC); |
| 6304 | |
| 6305 | displaced_write_reg (regs, dsc, dsc->rd, rd_val, ALU_WRITE_PC); |
| 6306 | } |
| 6307 | |
| 6308 | static void |
| 6309 | install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs, |
| 6310 | struct displaced_step_closure *dsc, |
| 6311 | unsigned int rd, unsigned int rn, unsigned int rm, |
| 6312 | unsigned rs) |
| 6313 | { |
| 6314 | int i; |
| 6315 | ULONGEST rd_val, rn_val, rm_val, rs_val; |
| 6316 | |
| 6317 | /* Instruction is of form: |
| 6318 | |
| 6319 | <op><cond> rd, [rn,] rm, <shift> rs |
| 6320 | |
| 6321 | Rewrite as: |
| 6322 | |
| 6323 | Preparation: tmp1, tmp2, tmp3, tmp4 <- r0, r1, r2, r3 |
| 6324 | r0, r1, r2, r3 <- rd, rn, rm, rs |
| 6325 | Insn: <op><cond> r0, r1, r2, <shift> r3 |
| 6326 | Cleanup: tmp5 <- r0 |
| 6327 | r0, r1, r2, r3 <- tmp1, tmp2, tmp3, tmp4 |
| 6328 | rd <- tmp5 |
| 6329 | */ |
| 6330 | |
| 6331 | for (i = 0; i < 4; i++) |
| 6332 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
| 6333 | |
| 6334 | rd_val = displaced_read_reg (regs, dsc, rd); |
| 6335 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 6336 | rm_val = displaced_read_reg (regs, dsc, rm); |
| 6337 | rs_val = displaced_read_reg (regs, dsc, rs); |
| 6338 | displaced_write_reg (regs, dsc, 0, rd_val, CANNOT_WRITE_PC); |
| 6339 | displaced_write_reg (regs, dsc, 1, rn_val, CANNOT_WRITE_PC); |
| 6340 | displaced_write_reg (regs, dsc, 2, rm_val, CANNOT_WRITE_PC); |
| 6341 | displaced_write_reg (regs, dsc, 3, rs_val, CANNOT_WRITE_PC); |
| 6342 | dsc->rd = rd; |
| 6343 | dsc->cleanup = &cleanup_alu_shifted_reg; |
| 6344 | } |
| 6345 | |
| 6346 | static int |
| 6347 | arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn, |
| 6348 | struct regcache *regs, |
| 6349 | struct displaced_step_closure *dsc) |
| 6350 | { |
| 6351 | unsigned int op = bits (insn, 21, 24); |
| 6352 | int is_mov = (op == 0xd); |
| 6353 | unsigned int rd, rn, rm, rs; |
| 6354 | |
| 6355 | if (!insn_references_pc (insn, 0x000fff0ful)) |
| 6356 | return arm_copy_unmodified (gdbarch, insn, "ALU shifted reg", dsc); |
| 6357 | |
| 6358 | if (debug_displaced) |
| 6359 | fprintf_unfiltered (gdb_stdlog, "displaced: copying shifted reg %s insn " |
| 6360 | "%.8lx\n", is_mov ? "move" : "ALU", |
| 6361 | (unsigned long) insn); |
| 6362 | |
| 6363 | rn = bits (insn, 16, 19); |
| 6364 | rm = bits (insn, 0, 3); |
| 6365 | rs = bits (insn, 8, 11); |
| 6366 | rd = bits (insn, 12, 15); |
| 6367 | |
| 6368 | if (is_mov) |
| 6369 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x302; |
| 6370 | else |
| 6371 | dsc->modinsn[0] = (insn & 0xfff000f0) | 0x10302; |
| 6372 | |
| 6373 | install_alu_shifted_reg (gdbarch, regs, dsc, rd, rn, rm, rs); |
| 6374 | |
| 6375 | return 0; |
| 6376 | } |
| 6377 | |
| 6378 | /* Clean up load instructions. */ |
| 6379 | |
| 6380 | static void |
| 6381 | cleanup_load (struct gdbarch *gdbarch, struct regcache *regs, |
| 6382 | struct displaced_step_closure *dsc) |
| 6383 | { |
| 6384 | ULONGEST rt_val, rt_val2 = 0, rn_val; |
| 6385 | |
| 6386 | rt_val = displaced_read_reg (regs, dsc, 0); |
| 6387 | if (dsc->u.ldst.xfersize == 8) |
| 6388 | rt_val2 = displaced_read_reg (regs, dsc, 1); |
| 6389 | rn_val = displaced_read_reg (regs, dsc, 2); |
| 6390 | |
| 6391 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
| 6392 | if (dsc->u.ldst.xfersize > 4) |
| 6393 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); |
| 6394 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); |
| 6395 | if (!dsc->u.ldst.immed) |
| 6396 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); |
| 6397 | |
| 6398 | /* Handle register writeback. */ |
| 6399 | if (dsc->u.ldst.writeback) |
| 6400 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); |
| 6401 | /* Put result in right place. */ |
| 6402 | displaced_write_reg (regs, dsc, dsc->rd, rt_val, LOAD_WRITE_PC); |
| 6403 | if (dsc->u.ldst.xfersize == 8) |
| 6404 | displaced_write_reg (regs, dsc, dsc->rd + 1, rt_val2, LOAD_WRITE_PC); |
| 6405 | } |
| 6406 | |
| 6407 | /* Clean up store instructions. */ |
| 6408 | |
| 6409 | static void |
| 6410 | cleanup_store (struct gdbarch *gdbarch, struct regcache *regs, |
| 6411 | struct displaced_step_closure *dsc) |
| 6412 | { |
| 6413 | ULONGEST rn_val = displaced_read_reg (regs, dsc, 2); |
| 6414 | |
| 6415 | displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC); |
| 6416 | if (dsc->u.ldst.xfersize > 4) |
| 6417 | displaced_write_reg (regs, dsc, 1, dsc->tmp[1], CANNOT_WRITE_PC); |
| 6418 | displaced_write_reg (regs, dsc, 2, dsc->tmp[2], CANNOT_WRITE_PC); |
| 6419 | if (!dsc->u.ldst.immed) |
| 6420 | displaced_write_reg (regs, dsc, 3, dsc->tmp[3], CANNOT_WRITE_PC); |
| 6421 | if (!dsc->u.ldst.restore_r4) |
| 6422 | displaced_write_reg (regs, dsc, 4, dsc->tmp[4], CANNOT_WRITE_PC); |
| 6423 | |
| 6424 | /* Writeback. */ |
| 6425 | if (dsc->u.ldst.writeback) |
| 6426 | displaced_write_reg (regs, dsc, dsc->u.ldst.rn, rn_val, CANNOT_WRITE_PC); |
| 6427 | } |
| 6428 | |
| 6429 | /* Copy "extra" load/store instructions. These are halfword/doubleword |
| 6430 | transfers, which have a different encoding to byte/word transfers. */ |
| 6431 | |
| 6432 | static int |
| 6433 | arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unpriveleged, |
| 6434 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 6435 | { |
| 6436 | unsigned int op1 = bits (insn, 20, 24); |
| 6437 | unsigned int op2 = bits (insn, 5, 6); |
| 6438 | unsigned int rt = bits (insn, 12, 15); |
| 6439 | unsigned int rn = bits (insn, 16, 19); |
| 6440 | unsigned int rm = bits (insn, 0, 3); |
| 6441 | char load[12] = {0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1}; |
| 6442 | char bytesize[12] = {2, 2, 2, 2, 8, 1, 8, 1, 8, 2, 8, 2}; |
| 6443 | int immed = (op1 & 0x4) != 0; |
| 6444 | int opcode; |
| 6445 | ULONGEST rt_val, rt_val2 = 0, rn_val, rm_val = 0; |
| 6446 | |
| 6447 | if (!insn_references_pc (insn, 0x000ff00ful)) |
| 6448 | return arm_copy_unmodified (gdbarch, insn, "extra load/store", dsc); |
| 6449 | |
| 6450 | if (debug_displaced) |
| 6451 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %sextra load/store " |
| 6452 | "insn %.8lx\n", unpriveleged ? "unpriveleged " : "", |
| 6453 | (unsigned long) insn); |
| 6454 | |
| 6455 | opcode = ((op2 << 2) | (op1 & 0x1) | ((op1 & 0x4) >> 1)) - 4; |
| 6456 | |
| 6457 | if (opcode < 0) |
| 6458 | internal_error (__FILE__, __LINE__, |
| 6459 | _("copy_extra_ld_st: instruction decode error")); |
| 6460 | |
| 6461 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 6462 | dsc->tmp[1] = displaced_read_reg (regs, dsc, 1); |
| 6463 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); |
| 6464 | if (!immed) |
| 6465 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
| 6466 | |
| 6467 | rt_val = displaced_read_reg (regs, dsc, rt); |
| 6468 | if (bytesize[opcode] == 8) |
| 6469 | rt_val2 = displaced_read_reg (regs, dsc, rt + 1); |
| 6470 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 6471 | if (!immed) |
| 6472 | rm_val = displaced_read_reg (regs, dsc, rm); |
| 6473 | |
| 6474 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); |
| 6475 | if (bytesize[opcode] == 8) |
| 6476 | displaced_write_reg (regs, dsc, 1, rt_val2, CANNOT_WRITE_PC); |
| 6477 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); |
| 6478 | if (!immed) |
| 6479 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); |
| 6480 | |
| 6481 | dsc->rd = rt; |
| 6482 | dsc->u.ldst.xfersize = bytesize[opcode]; |
| 6483 | dsc->u.ldst.rn = rn; |
| 6484 | dsc->u.ldst.immed = immed; |
| 6485 | dsc->u.ldst.writeback = bit (insn, 24) == 0 || bit (insn, 21) != 0; |
| 6486 | dsc->u.ldst.restore_r4 = 0; |
| 6487 | |
| 6488 | if (immed) |
| 6489 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, #imm] |
| 6490 | -> |
| 6491 | {ldr,str}<width><cond> r0, [r1,] [r2, #imm]. */ |
| 6492 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; |
| 6493 | else |
| 6494 | /* {ldr,str}<width><cond> rt, [rt2,] [rn, +/-rm] |
| 6495 | -> |
| 6496 | {ldr,str}<width><cond> r0, [r1,] [r2, +/-r3]. */ |
| 6497 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; |
| 6498 | |
| 6499 | dsc->cleanup = load[opcode] ? &cleanup_load : &cleanup_store; |
| 6500 | |
| 6501 | return 0; |
| 6502 | } |
| 6503 | |
| 6504 | /* Copy byte/half word/word loads and stores. */ |
| 6505 | |
| 6506 | static void |
| 6507 | install_load_store (struct gdbarch *gdbarch, struct regcache *regs, |
| 6508 | struct displaced_step_closure *dsc, int load, |
| 6509 | int immed, int writeback, int size, int usermode, |
| 6510 | int rt, int rm, int rn) |
| 6511 | { |
| 6512 | ULONGEST rt_val, rn_val, rm_val = 0; |
| 6513 | |
| 6514 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 6515 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); |
| 6516 | if (!immed) |
| 6517 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
| 6518 | if (!load) |
| 6519 | dsc->tmp[4] = displaced_read_reg (regs, dsc, 4); |
| 6520 | |
| 6521 | rt_val = displaced_read_reg (regs, dsc, rt); |
| 6522 | rn_val = displaced_read_reg (regs, dsc, rn); |
| 6523 | if (!immed) |
| 6524 | rm_val = displaced_read_reg (regs, dsc, rm); |
| 6525 | |
| 6526 | displaced_write_reg (regs, dsc, 0, rt_val, CANNOT_WRITE_PC); |
| 6527 | displaced_write_reg (regs, dsc, 2, rn_val, CANNOT_WRITE_PC); |
| 6528 | if (!immed) |
| 6529 | displaced_write_reg (regs, dsc, 3, rm_val, CANNOT_WRITE_PC); |
| 6530 | dsc->rd = rt; |
| 6531 | dsc->u.ldst.xfersize = size; |
| 6532 | dsc->u.ldst.rn = rn; |
| 6533 | dsc->u.ldst.immed = immed; |
| 6534 | dsc->u.ldst.writeback = writeback; |
| 6535 | |
| 6536 | /* To write PC we can do: |
| 6537 | |
| 6538 | Before this sequence of instructions: |
| 6539 | r0 is the PC value got from displaced_read_reg, so r0 = from + 8; |
| 6540 | r2 is the Rn value got from dispalced_read_reg. |
| 6541 | |
| 6542 | Insn1: push {pc} Write address of STR instruction + offset on stack |
| 6543 | Insn2: pop {r4} Read it back from stack, r4 = addr(Insn1) + offset |
| 6544 | Insn3: sub r4, r4, pc r4 = addr(Insn1) + offset - pc |
| 6545 | = addr(Insn1) + offset - addr(Insn3) - 8 |
| 6546 | = offset - 16 |
| 6547 | Insn4: add r4, r4, #8 r4 = offset - 8 |
| 6548 | Insn5: add r0, r0, r4 r0 = from + 8 + offset - 8 |
| 6549 | = from + offset |
| 6550 | Insn6: str r0, [r2, #imm] (or str r0, [r2, r3]) |
| 6551 | |
| 6552 | Otherwise we don't know what value to write for PC, since the offset is |
| 6553 | architecture-dependent (sometimes PC+8, sometimes PC+12). More details |
| 6554 | of this can be found in Section "Saving from r15" in |
| 6555 | http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204g/Cihbjifh.html */ |
| 6556 | |
| 6557 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; |
| 6558 | } |
| 6559 | |
| 6560 | |
| 6561 | static int |
| 6562 | thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1, |
| 6563 | uint16_t insn2, struct regcache *regs, |
| 6564 | struct displaced_step_closure *dsc, int size) |
| 6565 | { |
| 6566 | unsigned int u_bit = bit (insn1, 7); |
| 6567 | unsigned int rt = bits (insn2, 12, 15); |
| 6568 | int imm12 = bits (insn2, 0, 11); |
| 6569 | ULONGEST pc_val; |
| 6570 | |
| 6571 | if (debug_displaced) |
| 6572 | fprintf_unfiltered (gdb_stdlog, |
| 6573 | "displaced: copying ldr pc (0x%x) R%d %c imm12 %.4x\n", |
| 6574 | (unsigned int) dsc->insn_addr, rt, u_bit ? '+' : '-', |
| 6575 | imm12); |
| 6576 | |
| 6577 | if (!u_bit) |
| 6578 | imm12 = -1 * imm12; |
| 6579 | |
| 6580 | /* Rewrite instruction LDR Rt imm12 into: |
| 6581 | |
| 6582 | Prepare: tmp[0] <- r0, tmp[1] <- r2, tmp[2] <- r3, r2 <- pc, r3 <- imm12 |
| 6583 | |
| 6584 | LDR R0, R2, R3, |
| 6585 | |
| 6586 | Cleanup: rt <- r0, r0 <- tmp[0], r2 <- tmp[1], r3 <- tmp[2]. */ |
| 6587 | |
| 6588 | |
| 6589 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 6590 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); |
| 6591 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
| 6592 | |
| 6593 | pc_val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); |
| 6594 | |
| 6595 | pc_val = pc_val & 0xfffffffc; |
| 6596 | |
| 6597 | displaced_write_reg (regs, dsc, 2, pc_val, CANNOT_WRITE_PC); |
| 6598 | displaced_write_reg (regs, dsc, 3, imm12, CANNOT_WRITE_PC); |
| 6599 | |
| 6600 | dsc->rd = rt; |
| 6601 | |
| 6602 | dsc->u.ldst.xfersize = size; |
| 6603 | dsc->u.ldst.immed = 0; |
| 6604 | dsc->u.ldst.writeback = 0; |
| 6605 | dsc->u.ldst.restore_r4 = 0; |
| 6606 | |
| 6607 | /* LDR R0, R2, R3 */ |
| 6608 | dsc->modinsn[0] = 0xf852; |
| 6609 | dsc->modinsn[1] = 0x3; |
| 6610 | dsc->numinsns = 2; |
| 6611 | |
| 6612 | dsc->cleanup = &cleanup_load; |
| 6613 | |
| 6614 | return 0; |
| 6615 | } |
| 6616 | |
| 6617 | static int |
| 6618 | thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1, |
| 6619 | uint16_t insn2, struct regcache *regs, |
| 6620 | struct displaced_step_closure *dsc, |
| 6621 | int writeback, int immed) |
| 6622 | { |
| 6623 | unsigned int rt = bits (insn2, 12, 15); |
| 6624 | unsigned int rn = bits (insn1, 0, 3); |
| 6625 | unsigned int rm = bits (insn2, 0, 3); /* Only valid if !immed. */ |
| 6626 | /* In LDR (register), there is also a register Rm, which is not allowed to |
| 6627 | be PC, so we don't have to check it. */ |
| 6628 | |
| 6629 | if (rt != ARM_PC_REGNUM && rn != ARM_PC_REGNUM) |
| 6630 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "load", |
| 6631 | dsc); |
| 6632 | |
| 6633 | if (debug_displaced) |
| 6634 | fprintf_unfiltered (gdb_stdlog, |
| 6635 | "displaced: copying ldr r%d [r%d] insn %.4x%.4x\n", |
| 6636 | rt, rn, insn1, insn2); |
| 6637 | |
| 6638 | install_load_store (gdbarch, regs, dsc, 1, immed, writeback, 4, |
| 6639 | 0, rt, rm, rn); |
| 6640 | |
| 6641 | dsc->u.ldst.restore_r4 = 0; |
| 6642 | |
| 6643 | if (immed) |
| 6644 | /* ldr[b]<cond> rt, [rn, #imm], etc. |
| 6645 | -> |
| 6646 | ldr[b]<cond> r0, [r2, #imm]. */ |
| 6647 | { |
| 6648 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; |
| 6649 | dsc->modinsn[1] = insn2 & 0x0fff; |
| 6650 | } |
| 6651 | else |
| 6652 | /* ldr[b]<cond> rt, [rn, rm], etc. |
| 6653 | -> |
| 6654 | ldr[b]<cond> r0, [r2, r3]. */ |
| 6655 | { |
| 6656 | dsc->modinsn[0] = (insn1 & 0xfff0) | 0x2; |
| 6657 | dsc->modinsn[1] = (insn2 & 0x0ff0) | 0x3; |
| 6658 | } |
| 6659 | |
| 6660 | dsc->numinsns = 2; |
| 6661 | |
| 6662 | return 0; |
| 6663 | } |
| 6664 | |
| 6665 | |
| 6666 | static int |
| 6667 | arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn, |
| 6668 | struct regcache *regs, |
| 6669 | struct displaced_step_closure *dsc, |
| 6670 | int load, int size, int usermode) |
| 6671 | { |
| 6672 | int immed = !bit (insn, 25); |
| 6673 | int writeback = (bit (insn, 24) == 0 || bit (insn, 21) != 0); |
| 6674 | unsigned int rt = bits (insn, 12, 15); |
| 6675 | unsigned int rn = bits (insn, 16, 19); |
| 6676 | unsigned int rm = bits (insn, 0, 3); /* Only valid if !immed. */ |
| 6677 | |
| 6678 | if (!insn_references_pc (insn, 0x000ff00ful)) |
| 6679 | return arm_copy_unmodified (gdbarch, insn, "load/store", dsc); |
| 6680 | |
| 6681 | if (debug_displaced) |
| 6682 | fprintf_unfiltered (gdb_stdlog, |
| 6683 | "displaced: copying %s%s r%d [r%d] insn %.8lx\n", |
| 6684 | load ? (size == 1 ? "ldrb" : "ldr") |
| 6685 | : (size == 1 ? "strb" : "str"), usermode ? "t" : "", |
| 6686 | rt, rn, |
| 6687 | (unsigned long) insn); |
| 6688 | |
| 6689 | install_load_store (gdbarch, regs, dsc, load, immed, writeback, size, |
| 6690 | usermode, rt, rm, rn); |
| 6691 | |
| 6692 | if (load || rt != ARM_PC_REGNUM) |
| 6693 | { |
| 6694 | dsc->u.ldst.restore_r4 = 0; |
| 6695 | |
| 6696 | if (immed) |
| 6697 | /* {ldr,str}[b]<cond> rt, [rn, #imm], etc. |
| 6698 | -> |
| 6699 | {ldr,str}[b]<cond> r0, [r2, #imm]. */ |
| 6700 | dsc->modinsn[0] = (insn & 0xfff00fff) | 0x20000; |
| 6701 | else |
| 6702 | /* {ldr,str}[b]<cond> rt, [rn, rm], etc. |
| 6703 | -> |
| 6704 | {ldr,str}[b]<cond> r0, [r2, r3]. */ |
| 6705 | dsc->modinsn[0] = (insn & 0xfff00ff0) | 0x20003; |
| 6706 | } |
| 6707 | else |
| 6708 | { |
| 6709 | /* We need to use r4 as scratch. Make sure it's restored afterwards. */ |
| 6710 | dsc->u.ldst.restore_r4 = 1; |
| 6711 | dsc->modinsn[0] = 0xe92d8000; /* push {pc} */ |
| 6712 | dsc->modinsn[1] = 0xe8bd0010; /* pop {r4} */ |
| 6713 | dsc->modinsn[2] = 0xe044400f; /* sub r4, r4, pc. */ |
| 6714 | dsc->modinsn[3] = 0xe2844008; /* add r4, r4, #8. */ |
| 6715 | dsc->modinsn[4] = 0xe0800004; /* add r0, r0, r4. */ |
| 6716 | |
| 6717 | /* As above. */ |
| 6718 | if (immed) |
| 6719 | dsc->modinsn[5] = (insn & 0xfff00fff) | 0x20000; |
| 6720 | else |
| 6721 | dsc->modinsn[5] = (insn & 0xfff00ff0) | 0x20003; |
| 6722 | |
| 6723 | dsc->numinsns = 6; |
| 6724 | } |
| 6725 | |
| 6726 | dsc->cleanup = load ? &cleanup_load : &cleanup_store; |
| 6727 | |
| 6728 | return 0; |
| 6729 | } |
| 6730 | |
| 6731 | /* Cleanup LDM instructions with fully-populated register list. This is an |
| 6732 | unfortunate corner case: it's impossible to implement correctly by modifying |
| 6733 | the instruction. The issue is as follows: we have an instruction, |
| 6734 | |
| 6735 | ldm rN, {r0-r15} |
| 6736 | |
| 6737 | which we must rewrite to avoid loading PC. A possible solution would be to |
| 6738 | do the load in two halves, something like (with suitable cleanup |
| 6739 | afterwards): |
| 6740 | |
| 6741 | mov r8, rN |
| 6742 | ldm[id][ab] r8!, {r0-r7} |
| 6743 | str r7, <temp> |
| 6744 | ldm[id][ab] r8, {r7-r14} |
| 6745 | <bkpt> |
| 6746 | |
| 6747 | but at present there's no suitable place for <temp>, since the scratch space |
| 6748 | is overwritten before the cleanup routine is called. For now, we simply |
| 6749 | emulate the instruction. */ |
| 6750 | |
| 6751 | static void |
| 6752 | cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs, |
| 6753 | struct displaced_step_closure *dsc) |
| 6754 | { |
| 6755 | int inc = dsc->u.block.increment; |
| 6756 | int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0; |
| 6757 | int bump_after = dsc->u.block.before ? 0 : (inc ? 4 : -4); |
| 6758 | uint32_t regmask = dsc->u.block.regmask; |
| 6759 | int regno = inc ? 0 : 15; |
| 6760 | CORE_ADDR xfer_addr = dsc->u.block.xfer_addr; |
| 6761 | int exception_return = dsc->u.block.load && dsc->u.block.user |
| 6762 | && (regmask & 0x8000) != 0; |
| 6763 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
| 6764 | int do_transfer = condition_true (dsc->u.block.cond, status); |
| 6765 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 6766 | |
| 6767 | if (!do_transfer) |
| 6768 | return; |
| 6769 | |
| 6770 | /* If the instruction is ldm rN, {...pc}^, I don't think there's anything |
| 6771 | sensible we can do here. Complain loudly. */ |
| 6772 | if (exception_return) |
| 6773 | error (_("Cannot single-step exception return")); |
| 6774 | |
| 6775 | /* We don't handle any stores here for now. */ |
| 6776 | gdb_assert (dsc->u.block.load != 0); |
| 6777 | |
| 6778 | if (debug_displaced) |
| 6779 | fprintf_unfiltered (gdb_stdlog, "displaced: emulating block transfer: " |
| 6780 | "%s %s %s\n", dsc->u.block.load ? "ldm" : "stm", |
| 6781 | dsc->u.block.increment ? "inc" : "dec", |
| 6782 | dsc->u.block.before ? "before" : "after"); |
| 6783 | |
| 6784 | while (regmask) |
| 6785 | { |
| 6786 | uint32_t memword; |
| 6787 | |
| 6788 | if (inc) |
| 6789 | while (regno <= ARM_PC_REGNUM && (regmask & (1 << regno)) == 0) |
| 6790 | regno++; |
| 6791 | else |
| 6792 | while (regno >= 0 && (regmask & (1 << regno)) == 0) |
| 6793 | regno--; |
| 6794 | |
| 6795 | xfer_addr += bump_before; |
| 6796 | |
| 6797 | memword = read_memory_unsigned_integer (xfer_addr, 4, byte_order); |
| 6798 | displaced_write_reg (regs, dsc, regno, memword, LOAD_WRITE_PC); |
| 6799 | |
| 6800 | xfer_addr += bump_after; |
| 6801 | |
| 6802 | regmask &= ~(1 << regno); |
| 6803 | } |
| 6804 | |
| 6805 | if (dsc->u.block.writeback) |
| 6806 | displaced_write_reg (regs, dsc, dsc->u.block.rn, xfer_addr, |
| 6807 | CANNOT_WRITE_PC); |
| 6808 | } |
| 6809 | |
| 6810 | /* Clean up an STM which included the PC in the register list. */ |
| 6811 | |
| 6812 | static void |
| 6813 | cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs, |
| 6814 | struct displaced_step_closure *dsc) |
| 6815 | { |
| 6816 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
| 6817 | int store_executed = condition_true (dsc->u.block.cond, status); |
| 6818 | CORE_ADDR pc_stored_at, transferred_regs = bitcount (dsc->u.block.regmask); |
| 6819 | CORE_ADDR stm_insn_addr; |
| 6820 | uint32_t pc_val; |
| 6821 | long offset; |
| 6822 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 6823 | |
| 6824 | /* If condition code fails, there's nothing else to do. */ |
| 6825 | if (!store_executed) |
| 6826 | return; |
| 6827 | |
| 6828 | if (dsc->u.block.increment) |
| 6829 | { |
| 6830 | pc_stored_at = dsc->u.block.xfer_addr + 4 * transferred_regs; |
| 6831 | |
| 6832 | if (dsc->u.block.before) |
| 6833 | pc_stored_at += 4; |
| 6834 | } |
| 6835 | else |
| 6836 | { |
| 6837 | pc_stored_at = dsc->u.block.xfer_addr; |
| 6838 | |
| 6839 | if (dsc->u.block.before) |
| 6840 | pc_stored_at -= 4; |
| 6841 | } |
| 6842 | |
| 6843 | pc_val = read_memory_unsigned_integer (pc_stored_at, 4, byte_order); |
| 6844 | stm_insn_addr = dsc->scratch_base; |
| 6845 | offset = pc_val - stm_insn_addr; |
| 6846 | |
| 6847 | if (debug_displaced) |
| 6848 | fprintf_unfiltered (gdb_stdlog, "displaced: detected PC offset %.8lx for " |
| 6849 | "STM instruction\n", offset); |
| 6850 | |
| 6851 | /* Rewrite the stored PC to the proper value for the non-displaced original |
| 6852 | instruction. */ |
| 6853 | write_memory_unsigned_integer (pc_stored_at, 4, byte_order, |
| 6854 | dsc->insn_addr + offset); |
| 6855 | } |
| 6856 | |
| 6857 | /* Clean up an LDM which includes the PC in the register list. We clumped all |
| 6858 | the registers in the transferred list into a contiguous range r0...rX (to |
| 6859 | avoid loading PC directly and losing control of the debugged program), so we |
| 6860 | must undo that here. */ |
| 6861 | |
| 6862 | static void |
| 6863 | cleanup_block_load_pc (struct gdbarch *gdbarch, |
| 6864 | struct regcache *regs, |
| 6865 | struct displaced_step_closure *dsc) |
| 6866 | { |
| 6867 | uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM); |
| 6868 | int load_executed = condition_true (dsc->u.block.cond, status), i; |
| 6869 | unsigned int mask = dsc->u.block.regmask, write_reg = ARM_PC_REGNUM; |
| 6870 | unsigned int regs_loaded = bitcount (mask); |
| 6871 | unsigned int num_to_shuffle = regs_loaded, clobbered; |
| 6872 | |
| 6873 | /* The method employed here will fail if the register list is fully populated |
| 6874 | (we need to avoid loading PC directly). */ |
| 6875 | gdb_assert (num_to_shuffle < 16); |
| 6876 | |
| 6877 | if (!load_executed) |
| 6878 | return; |
| 6879 | |
| 6880 | clobbered = (1 << num_to_shuffle) - 1; |
| 6881 | |
| 6882 | while (num_to_shuffle > 0) |
| 6883 | { |
| 6884 | if ((mask & (1 << write_reg)) != 0) |
| 6885 | { |
| 6886 | unsigned int read_reg = num_to_shuffle - 1; |
| 6887 | |
| 6888 | if (read_reg != write_reg) |
| 6889 | { |
| 6890 | ULONGEST rval = displaced_read_reg (regs, dsc, read_reg); |
| 6891 | displaced_write_reg (regs, dsc, write_reg, rval, LOAD_WRITE_PC); |
| 6892 | if (debug_displaced) |
| 6893 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: move " |
| 6894 | "loaded register r%d to r%d\n"), read_reg, |
| 6895 | write_reg); |
| 6896 | } |
| 6897 | else if (debug_displaced) |
| 6898 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: register " |
| 6899 | "r%d already in the right place\n"), |
| 6900 | write_reg); |
| 6901 | |
| 6902 | clobbered &= ~(1 << write_reg); |
| 6903 | |
| 6904 | num_to_shuffle--; |
| 6905 | } |
| 6906 | |
| 6907 | write_reg--; |
| 6908 | } |
| 6909 | |
| 6910 | /* Restore any registers we scribbled over. */ |
| 6911 | for (write_reg = 0; clobbered != 0; write_reg++) |
| 6912 | { |
| 6913 | if ((clobbered & (1 << write_reg)) != 0) |
| 6914 | { |
| 6915 | displaced_write_reg (regs, dsc, write_reg, dsc->tmp[write_reg], |
| 6916 | CANNOT_WRITE_PC); |
| 6917 | if (debug_displaced) |
| 6918 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM: restored " |
| 6919 | "clobbered register r%d\n"), write_reg); |
| 6920 | clobbered &= ~(1 << write_reg); |
| 6921 | } |
| 6922 | } |
| 6923 | |
| 6924 | /* Perform register writeback manually. */ |
| 6925 | if (dsc->u.block.writeback) |
| 6926 | { |
| 6927 | ULONGEST new_rn_val = dsc->u.block.xfer_addr; |
| 6928 | |
| 6929 | if (dsc->u.block.increment) |
| 6930 | new_rn_val += regs_loaded * 4; |
| 6931 | else |
| 6932 | new_rn_val -= regs_loaded * 4; |
| 6933 | |
| 6934 | displaced_write_reg (regs, dsc, dsc->u.block.rn, new_rn_val, |
| 6935 | CANNOT_WRITE_PC); |
| 6936 | } |
| 6937 | } |
| 6938 | |
| 6939 | /* Handle ldm/stm, apart from some tricky cases which are unlikely to occur |
| 6940 | in user-level code (in particular exception return, ldm rn, {...pc}^). */ |
| 6941 | |
| 6942 | static int |
| 6943 | arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn, |
| 6944 | struct regcache *regs, |
| 6945 | struct displaced_step_closure *dsc) |
| 6946 | { |
| 6947 | int load = bit (insn, 20); |
| 6948 | int user = bit (insn, 22); |
| 6949 | int increment = bit (insn, 23); |
| 6950 | int before = bit (insn, 24); |
| 6951 | int writeback = bit (insn, 21); |
| 6952 | int rn = bits (insn, 16, 19); |
| 6953 | |
| 6954 | /* Block transfers which don't mention PC can be run directly |
| 6955 | out-of-line. */ |
| 6956 | if (rn != ARM_PC_REGNUM && (insn & 0x8000) == 0) |
| 6957 | return arm_copy_unmodified (gdbarch, insn, "ldm/stm", dsc); |
| 6958 | |
| 6959 | if (rn == ARM_PC_REGNUM) |
| 6960 | { |
| 6961 | warning (_("displaced: Unpredictable LDM or STM with " |
| 6962 | "base register r15")); |
| 6963 | return arm_copy_unmodified (gdbarch, insn, "unpredictable ldm/stm", dsc); |
| 6964 | } |
| 6965 | |
| 6966 | if (debug_displaced) |
| 6967 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " |
| 6968 | "%.8lx\n", (unsigned long) insn); |
| 6969 | |
| 6970 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
| 6971 | dsc->u.block.rn = rn; |
| 6972 | |
| 6973 | dsc->u.block.load = load; |
| 6974 | dsc->u.block.user = user; |
| 6975 | dsc->u.block.increment = increment; |
| 6976 | dsc->u.block.before = before; |
| 6977 | dsc->u.block.writeback = writeback; |
| 6978 | dsc->u.block.cond = bits (insn, 28, 31); |
| 6979 | |
| 6980 | dsc->u.block.regmask = insn & 0xffff; |
| 6981 | |
| 6982 | if (load) |
| 6983 | { |
| 6984 | if ((insn & 0xffff) == 0xffff) |
| 6985 | { |
| 6986 | /* LDM with a fully-populated register list. This case is |
| 6987 | particularly tricky. Implement for now by fully emulating the |
| 6988 | instruction (which might not behave perfectly in all cases, but |
| 6989 | these instructions should be rare enough for that not to matter |
| 6990 | too much). */ |
| 6991 | dsc->modinsn[0] = ARM_NOP; |
| 6992 | |
| 6993 | dsc->cleanup = &cleanup_block_load_all; |
| 6994 | } |
| 6995 | else |
| 6996 | { |
| 6997 | /* LDM of a list of registers which includes PC. Implement by |
| 6998 | rewriting the list of registers to be transferred into a |
| 6999 | contiguous chunk r0...rX before doing the transfer, then shuffling |
| 7000 | registers into the correct places in the cleanup routine. */ |
| 7001 | unsigned int regmask = insn & 0xffff; |
| 7002 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; |
| 7003 | unsigned int to = 0, from = 0, i, new_rn; |
| 7004 | |
| 7005 | for (i = 0; i < num_in_list; i++) |
| 7006 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
| 7007 | |
| 7008 | /* Writeback makes things complicated. We need to avoid clobbering |
| 7009 | the base register with one of the registers in our modified |
| 7010 | register list, but just using a different register can't work in |
| 7011 | all cases, e.g.: |
| 7012 | |
| 7013 | ldm r14!, {r0-r13,pc} |
| 7014 | |
| 7015 | which would need to be rewritten as: |
| 7016 | |
| 7017 | ldm rN!, {r0-r14} |
| 7018 | |
| 7019 | but that can't work, because there's no free register for N. |
| 7020 | |
| 7021 | Solve this by turning off the writeback bit, and emulating |
| 7022 | writeback manually in the cleanup routine. */ |
| 7023 | |
| 7024 | if (writeback) |
| 7025 | insn &= ~(1 << 21); |
| 7026 | |
| 7027 | new_regmask = (1 << num_in_list) - 1; |
| 7028 | |
| 7029 | if (debug_displaced) |
| 7030 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " |
| 7031 | "{..., pc}: original reg list %.4x, modified " |
| 7032 | "list %.4x\n"), rn, writeback ? "!" : "", |
| 7033 | (int) insn & 0xffff, new_regmask); |
| 7034 | |
| 7035 | dsc->modinsn[0] = (insn & ~0xffff) | (new_regmask & 0xffff); |
| 7036 | |
| 7037 | dsc->cleanup = &cleanup_block_load_pc; |
| 7038 | } |
| 7039 | } |
| 7040 | else |
| 7041 | { |
| 7042 | /* STM of a list of registers which includes PC. Run the instruction |
| 7043 | as-is, but out of line: this will store the wrong value for the PC, |
| 7044 | so we must manually fix up the memory in the cleanup routine. |
| 7045 | Doing things this way has the advantage that we can auto-detect |
| 7046 | the offset of the PC write (which is architecture-dependent) in |
| 7047 | the cleanup routine. */ |
| 7048 | dsc->modinsn[0] = insn; |
| 7049 | |
| 7050 | dsc->cleanup = &cleanup_block_store_pc; |
| 7051 | } |
| 7052 | |
| 7053 | return 0; |
| 7054 | } |
| 7055 | |
| 7056 | static int |
| 7057 | thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, |
| 7058 | struct regcache *regs, |
| 7059 | struct displaced_step_closure *dsc) |
| 7060 | { |
| 7061 | int rn = bits (insn1, 0, 3); |
| 7062 | int load = bit (insn1, 4); |
| 7063 | int writeback = bit (insn1, 5); |
| 7064 | |
| 7065 | /* Block transfers which don't mention PC can be run directly |
| 7066 | out-of-line. */ |
| 7067 | if (rn != ARM_PC_REGNUM && (insn2 & 0x8000) == 0) |
| 7068 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "ldm/stm", dsc); |
| 7069 | |
| 7070 | if (rn == ARM_PC_REGNUM) |
| 7071 | { |
| 7072 | warning (_("displaced: Unpredictable LDM or STM with " |
| 7073 | "base register r15")); |
| 7074 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7075 | "unpredictable ldm/stm", dsc); |
| 7076 | } |
| 7077 | |
| 7078 | if (debug_displaced) |
| 7079 | fprintf_unfiltered (gdb_stdlog, "displaced: copying block transfer insn " |
| 7080 | "%.4x%.4x\n", insn1, insn2); |
| 7081 | |
| 7082 | /* Clear bit 13, since it should be always zero. */ |
| 7083 | dsc->u.block.regmask = (insn2 & 0xdfff); |
| 7084 | dsc->u.block.rn = rn; |
| 7085 | |
| 7086 | dsc->u.block.load = load; |
| 7087 | dsc->u.block.user = 0; |
| 7088 | dsc->u.block.increment = bit (insn1, 7); |
| 7089 | dsc->u.block.before = bit (insn1, 8); |
| 7090 | dsc->u.block.writeback = writeback; |
| 7091 | dsc->u.block.cond = INST_AL; |
| 7092 | dsc->u.block.xfer_addr = displaced_read_reg (regs, dsc, rn); |
| 7093 | |
| 7094 | if (load) |
| 7095 | { |
| 7096 | if (dsc->u.block.regmask == 0xffff) |
| 7097 | { |
| 7098 | /* This branch is impossible to happen. */ |
| 7099 | gdb_assert (0); |
| 7100 | } |
| 7101 | else |
| 7102 | { |
| 7103 | unsigned int regmask = dsc->u.block.regmask; |
| 7104 | unsigned int num_in_list = bitcount (regmask), new_regmask, bit = 1; |
| 7105 | unsigned int to = 0, from = 0, i, new_rn; |
| 7106 | |
| 7107 | for (i = 0; i < num_in_list; i++) |
| 7108 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
| 7109 | |
| 7110 | if (writeback) |
| 7111 | insn1 &= ~(1 << 5); |
| 7112 | |
| 7113 | new_regmask = (1 << num_in_list) - 1; |
| 7114 | |
| 7115 | if (debug_displaced) |
| 7116 | fprintf_unfiltered (gdb_stdlog, _("displaced: LDM r%d%s, " |
| 7117 | "{..., pc}: original reg list %.4x, modified " |
| 7118 | "list %.4x\n"), rn, writeback ? "!" : "", |
| 7119 | (int) dsc->u.block.regmask, new_regmask); |
| 7120 | |
| 7121 | dsc->modinsn[0] = insn1; |
| 7122 | dsc->modinsn[1] = (new_regmask & 0xffff); |
| 7123 | dsc->numinsns = 2; |
| 7124 | |
| 7125 | dsc->cleanup = &cleanup_block_load_pc; |
| 7126 | } |
| 7127 | } |
| 7128 | else |
| 7129 | { |
| 7130 | dsc->modinsn[0] = insn1; |
| 7131 | dsc->modinsn[1] = insn2; |
| 7132 | dsc->numinsns = 2; |
| 7133 | dsc->cleanup = &cleanup_block_store_pc; |
| 7134 | } |
| 7135 | return 0; |
| 7136 | } |
| 7137 | |
| 7138 | /* Cleanup/copy SVC (SWI) instructions. These two functions are overridden |
| 7139 | for Linux, where some SVC instructions must be treated specially. */ |
| 7140 | |
| 7141 | static void |
| 7142 | cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs, |
| 7143 | struct displaced_step_closure *dsc) |
| 7144 | { |
| 7145 | CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size; |
| 7146 | |
| 7147 | if (debug_displaced) |
| 7148 | fprintf_unfiltered (gdb_stdlog, "displaced: cleanup for svc, resume at " |
| 7149 | "%.8lx\n", (unsigned long) resume_addr); |
| 7150 | |
| 7151 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, resume_addr, BRANCH_WRITE_PC); |
| 7152 | } |
| 7153 | |
| 7154 | |
| 7155 | /* Common copy routine for svc instruciton. */ |
| 7156 | |
| 7157 | static int |
| 7158 | install_svc (struct gdbarch *gdbarch, struct regcache *regs, |
| 7159 | struct displaced_step_closure *dsc) |
| 7160 | { |
| 7161 | /* Preparation: none. |
| 7162 | Insn: unmodified svc. |
| 7163 | Cleanup: pc <- insn_addr + insn_size. */ |
| 7164 | |
| 7165 | /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next |
| 7166 | instruction. */ |
| 7167 | dsc->wrote_to_pc = 1; |
| 7168 | |
| 7169 | /* Allow OS-specific code to override SVC handling. */ |
| 7170 | if (dsc->u.svc.copy_svc_os) |
| 7171 | return dsc->u.svc.copy_svc_os (gdbarch, regs, dsc); |
| 7172 | else |
| 7173 | { |
| 7174 | dsc->cleanup = &cleanup_svc; |
| 7175 | return 0; |
| 7176 | } |
| 7177 | } |
| 7178 | |
| 7179 | static int |
| 7180 | arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn, |
| 7181 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 7182 | { |
| 7183 | |
| 7184 | if (debug_displaced) |
| 7185 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.8lx\n", |
| 7186 | (unsigned long) insn); |
| 7187 | |
| 7188 | dsc->modinsn[0] = insn; |
| 7189 | |
| 7190 | return install_svc (gdbarch, regs, dsc); |
| 7191 | } |
| 7192 | |
| 7193 | static int |
| 7194 | thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn, |
| 7195 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 7196 | { |
| 7197 | |
| 7198 | if (debug_displaced) |
| 7199 | fprintf_unfiltered (gdb_stdlog, "displaced: copying svc insn %.4x\n", |
| 7200 | insn); |
| 7201 | |
| 7202 | dsc->modinsn[0] = insn; |
| 7203 | |
| 7204 | return install_svc (gdbarch, regs, dsc); |
| 7205 | } |
| 7206 | |
| 7207 | /* Copy undefined instructions. */ |
| 7208 | |
| 7209 | static int |
| 7210 | arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn, |
| 7211 | struct displaced_step_closure *dsc) |
| 7212 | { |
| 7213 | if (debug_displaced) |
| 7214 | fprintf_unfiltered (gdb_stdlog, |
| 7215 | "displaced: copying undefined insn %.8lx\n", |
| 7216 | (unsigned long) insn); |
| 7217 | |
| 7218 | dsc->modinsn[0] = insn; |
| 7219 | |
| 7220 | return 0; |
| 7221 | } |
| 7222 | |
| 7223 | static int |
| 7224 | thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2, |
| 7225 | struct displaced_step_closure *dsc) |
| 7226 | { |
| 7227 | |
| 7228 | if (debug_displaced) |
| 7229 | fprintf_unfiltered (gdb_stdlog, "displaced: copying undefined insn " |
| 7230 | "%.4x %.4x\n", (unsigned short) insn1, |
| 7231 | (unsigned short) insn2); |
| 7232 | |
| 7233 | dsc->modinsn[0] = insn1; |
| 7234 | dsc->modinsn[1] = insn2; |
| 7235 | dsc->numinsns = 2; |
| 7236 | |
| 7237 | return 0; |
| 7238 | } |
| 7239 | |
| 7240 | /* Copy unpredictable instructions. */ |
| 7241 | |
| 7242 | static int |
| 7243 | arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn, |
| 7244 | struct displaced_step_closure *dsc) |
| 7245 | { |
| 7246 | if (debug_displaced) |
| 7247 | fprintf_unfiltered (gdb_stdlog, "displaced: copying unpredictable insn " |
| 7248 | "%.8lx\n", (unsigned long) insn); |
| 7249 | |
| 7250 | dsc->modinsn[0] = insn; |
| 7251 | |
| 7252 | return 0; |
| 7253 | } |
| 7254 | |
| 7255 | /* The decode_* functions are instruction decoding helpers. They mostly follow |
| 7256 | the presentation in the ARM ARM. */ |
| 7257 | |
| 7258 | static int |
| 7259 | arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn, |
| 7260 | struct regcache *regs, |
| 7261 | struct displaced_step_closure *dsc) |
| 7262 | { |
| 7263 | unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7); |
| 7264 | unsigned int rn = bits (insn, 16, 19); |
| 7265 | |
| 7266 | if (op1 == 0x10 && (op2 & 0x2) == 0x0 && (rn & 0xe) == 0x0) |
| 7267 | return arm_copy_unmodified (gdbarch, insn, "cps", dsc); |
| 7268 | else if (op1 == 0x10 && op2 == 0x0 && (rn & 0xe) == 0x1) |
| 7269 | return arm_copy_unmodified (gdbarch, insn, "setend", dsc); |
| 7270 | else if ((op1 & 0x60) == 0x20) |
| 7271 | return arm_copy_unmodified (gdbarch, insn, "neon dataproc", dsc); |
| 7272 | else if ((op1 & 0x71) == 0x40) |
| 7273 | return arm_copy_unmodified (gdbarch, insn, "neon elt/struct load/store", |
| 7274 | dsc); |
| 7275 | else if ((op1 & 0x77) == 0x41) |
| 7276 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
| 7277 | else if ((op1 & 0x77) == 0x45) |
| 7278 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pli. */ |
| 7279 | else if ((op1 & 0x77) == 0x51) |
| 7280 | { |
| 7281 | if (rn != 0xf) |
| 7282 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
| 7283 | else |
| 7284 | return arm_copy_unpred (gdbarch, insn, dsc); |
| 7285 | } |
| 7286 | else if ((op1 & 0x77) == 0x55) |
| 7287 | return arm_copy_preload (gdbarch, insn, regs, dsc); /* pld/pldw. */ |
| 7288 | else if (op1 == 0x57) |
| 7289 | switch (op2) |
| 7290 | { |
| 7291 | case 0x1: return arm_copy_unmodified (gdbarch, insn, "clrex", dsc); |
| 7292 | case 0x4: return arm_copy_unmodified (gdbarch, insn, "dsb", dsc); |
| 7293 | case 0x5: return arm_copy_unmodified (gdbarch, insn, "dmb", dsc); |
| 7294 | case 0x6: return arm_copy_unmodified (gdbarch, insn, "isb", dsc); |
| 7295 | default: return arm_copy_unpred (gdbarch, insn, dsc); |
| 7296 | } |
| 7297 | else if ((op1 & 0x63) == 0x43) |
| 7298 | return arm_copy_unpred (gdbarch, insn, dsc); |
| 7299 | else if ((op2 & 0x1) == 0x0) |
| 7300 | switch (op1 & ~0x80) |
| 7301 | { |
| 7302 | case 0x61: |
| 7303 | return arm_copy_unmodified (gdbarch, insn, "unallocated mem hint", dsc); |
| 7304 | case 0x65: |
| 7305 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); /* pli reg. */ |
| 7306 | case 0x71: case 0x75: |
| 7307 | /* pld/pldw reg. */ |
| 7308 | return arm_copy_preload_reg (gdbarch, insn, regs, dsc); |
| 7309 | case 0x63: case 0x67: case 0x73: case 0x77: |
| 7310 | return arm_copy_unpred (gdbarch, insn, dsc); |
| 7311 | default: |
| 7312 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7313 | } |
| 7314 | else |
| 7315 | return arm_copy_undef (gdbarch, insn, dsc); /* Probably unreachable. */ |
| 7316 | } |
| 7317 | |
| 7318 | static int |
| 7319 | arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn, |
| 7320 | struct regcache *regs, |
| 7321 | struct displaced_step_closure *dsc) |
| 7322 | { |
| 7323 | if (bit (insn, 27) == 0) |
| 7324 | return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc); |
| 7325 | /* Switch on bits: 0bxxxxx321xxx0xxxxxxxxxxxxxxxxxxxx. */ |
| 7326 | else switch (((insn & 0x7000000) >> 23) | ((insn & 0x100000) >> 20)) |
| 7327 | { |
| 7328 | case 0x0: case 0x2: |
| 7329 | return arm_copy_unmodified (gdbarch, insn, "srs", dsc); |
| 7330 | |
| 7331 | case 0x1: case 0x3: |
| 7332 | return arm_copy_unmodified (gdbarch, insn, "rfe", dsc); |
| 7333 | |
| 7334 | case 0x4: case 0x5: case 0x6: case 0x7: |
| 7335 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
| 7336 | |
| 7337 | case 0x8: |
| 7338 | switch ((insn & 0xe00000) >> 21) |
| 7339 | { |
| 7340 | case 0x1: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7: |
| 7341 | /* stc/stc2. */ |
| 7342 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
| 7343 | |
| 7344 | case 0x2: |
| 7345 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
| 7346 | |
| 7347 | default: |
| 7348 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7349 | } |
| 7350 | |
| 7351 | case 0x9: |
| 7352 | { |
| 7353 | int rn_f = (bits (insn, 16, 19) == 0xf); |
| 7354 | switch ((insn & 0xe00000) >> 21) |
| 7355 | { |
| 7356 | case 0x1: case 0x3: |
| 7357 | /* ldc/ldc2 imm (undefined for rn == pc). */ |
| 7358 | return rn_f ? arm_copy_undef (gdbarch, insn, dsc) |
| 7359 | : arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
| 7360 | |
| 7361 | case 0x2: |
| 7362 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
| 7363 | |
| 7364 | case 0x4: case 0x5: case 0x6: case 0x7: |
| 7365 | /* ldc/ldc2 lit (undefined for rn != pc). */ |
| 7366 | return rn_f ? arm_copy_copro_load_store (gdbarch, insn, regs, dsc) |
| 7367 | : arm_copy_undef (gdbarch, insn, dsc); |
| 7368 | |
| 7369 | default: |
| 7370 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7371 | } |
| 7372 | } |
| 7373 | |
| 7374 | case 0xa: |
| 7375 | return arm_copy_unmodified (gdbarch, insn, "stc/stc2", dsc); |
| 7376 | |
| 7377 | case 0xb: |
| 7378 | if (bits (insn, 16, 19) == 0xf) |
| 7379 | /* ldc/ldc2 lit. */ |
| 7380 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
| 7381 | else |
| 7382 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7383 | |
| 7384 | case 0xc: |
| 7385 | if (bit (insn, 4)) |
| 7386 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
| 7387 | else |
| 7388 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
| 7389 | |
| 7390 | case 0xd: |
| 7391 | if (bit (insn, 4)) |
| 7392 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
| 7393 | else |
| 7394 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
| 7395 | |
| 7396 | default: |
| 7397 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7398 | } |
| 7399 | } |
| 7400 | |
| 7401 | /* Decode miscellaneous instructions in dp/misc encoding space. */ |
| 7402 | |
| 7403 | static int |
| 7404 | arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn, |
| 7405 | struct regcache *regs, |
| 7406 | struct displaced_step_closure *dsc) |
| 7407 | { |
| 7408 | unsigned int op2 = bits (insn, 4, 6); |
| 7409 | unsigned int op = bits (insn, 21, 22); |
| 7410 | unsigned int op1 = bits (insn, 16, 19); |
| 7411 | |
| 7412 | switch (op2) |
| 7413 | { |
| 7414 | case 0x0: |
| 7415 | return arm_copy_unmodified (gdbarch, insn, "mrs/msr", dsc); |
| 7416 | |
| 7417 | case 0x1: |
| 7418 | if (op == 0x1) /* bx. */ |
| 7419 | return arm_copy_bx_blx_reg (gdbarch, insn, regs, dsc); |
| 7420 | else if (op == 0x3) |
| 7421 | return arm_copy_unmodified (gdbarch, insn, "clz", dsc); |
| 7422 | else |
| 7423 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7424 | |
| 7425 | case 0x2: |
| 7426 | if (op == 0x1) |
| 7427 | /* Not really supported. */ |
| 7428 | return arm_copy_unmodified (gdbarch, insn, "bxj", dsc); |
| 7429 | else |
| 7430 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7431 | |
| 7432 | case 0x3: |
| 7433 | if (op == 0x1) |
| 7434 | return arm_copy_bx_blx_reg (gdbarch, insn, |
| 7435 | regs, dsc); /* blx register. */ |
| 7436 | else |
| 7437 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7438 | |
| 7439 | case 0x5: |
| 7440 | return arm_copy_unmodified (gdbarch, insn, "saturating add/sub", dsc); |
| 7441 | |
| 7442 | case 0x7: |
| 7443 | if (op == 0x1) |
| 7444 | return arm_copy_unmodified (gdbarch, insn, "bkpt", dsc); |
| 7445 | else if (op == 0x3) |
| 7446 | /* Not really supported. */ |
| 7447 | return arm_copy_unmodified (gdbarch, insn, "smc", dsc); |
| 7448 | |
| 7449 | default: |
| 7450 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7451 | } |
| 7452 | } |
| 7453 | |
| 7454 | static int |
| 7455 | arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn, |
| 7456 | struct regcache *regs, |
| 7457 | struct displaced_step_closure *dsc) |
| 7458 | { |
| 7459 | if (bit (insn, 25)) |
| 7460 | switch (bits (insn, 20, 24)) |
| 7461 | { |
| 7462 | case 0x10: |
| 7463 | return arm_copy_unmodified (gdbarch, insn, "movw", dsc); |
| 7464 | |
| 7465 | case 0x14: |
| 7466 | return arm_copy_unmodified (gdbarch, insn, "movt", dsc); |
| 7467 | |
| 7468 | case 0x12: case 0x16: |
| 7469 | return arm_copy_unmodified (gdbarch, insn, "msr imm", dsc); |
| 7470 | |
| 7471 | default: |
| 7472 | return arm_copy_alu_imm (gdbarch, insn, regs, dsc); |
| 7473 | } |
| 7474 | else |
| 7475 | { |
| 7476 | uint32_t op1 = bits (insn, 20, 24), op2 = bits (insn, 4, 7); |
| 7477 | |
| 7478 | if ((op1 & 0x19) != 0x10 && (op2 & 0x1) == 0x0) |
| 7479 | return arm_copy_alu_reg (gdbarch, insn, regs, dsc); |
| 7480 | else if ((op1 & 0x19) != 0x10 && (op2 & 0x9) == 0x1) |
| 7481 | return arm_copy_alu_shifted_reg (gdbarch, insn, regs, dsc); |
| 7482 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x8) == 0x0) |
| 7483 | return arm_decode_miscellaneous (gdbarch, insn, regs, dsc); |
| 7484 | else if ((op1 & 0x19) == 0x10 && (op2 & 0x9) == 0x8) |
| 7485 | return arm_copy_unmodified (gdbarch, insn, "halfword mul/mla", dsc); |
| 7486 | else if ((op1 & 0x10) == 0x00 && op2 == 0x9) |
| 7487 | return arm_copy_unmodified (gdbarch, insn, "mul/mla", dsc); |
| 7488 | else if ((op1 & 0x10) == 0x10 && op2 == 0x9) |
| 7489 | return arm_copy_unmodified (gdbarch, insn, "synch", dsc); |
| 7490 | else if (op2 == 0xb || (op2 & 0xd) == 0xd) |
| 7491 | /* 2nd arg means "unpriveleged". */ |
| 7492 | return arm_copy_extra_ld_st (gdbarch, insn, (op1 & 0x12) == 0x02, regs, |
| 7493 | dsc); |
| 7494 | } |
| 7495 | |
| 7496 | /* Should be unreachable. */ |
| 7497 | return 1; |
| 7498 | } |
| 7499 | |
| 7500 | static int |
| 7501 | arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn, |
| 7502 | struct regcache *regs, |
| 7503 | struct displaced_step_closure *dsc) |
| 7504 | { |
| 7505 | int a = bit (insn, 25), b = bit (insn, 4); |
| 7506 | uint32_t op1 = bits (insn, 20, 24); |
| 7507 | int rn_f = bits (insn, 16, 19) == 0xf; |
| 7508 | |
| 7509 | if ((!a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02) |
| 7510 | || (a && (op1 & 0x05) == 0x00 && (op1 & 0x17) != 0x02 && !b)) |
| 7511 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 0); |
| 7512 | else if ((!a && (op1 & 0x17) == 0x02) |
| 7513 | || (a && (op1 & 0x17) == 0x02 && !b)) |
| 7514 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 4, 1); |
| 7515 | else if ((!a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03) |
| 7516 | || (a && (op1 & 0x05) == 0x01 && (op1 & 0x17) != 0x03 && !b)) |
| 7517 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 0); |
| 7518 | else if ((!a && (op1 & 0x17) == 0x03) |
| 7519 | || (a && (op1 & 0x17) == 0x03 && !b)) |
| 7520 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 4, 1); |
| 7521 | else if ((!a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06) |
| 7522 | || (a && (op1 & 0x05) == 0x04 && (op1 & 0x17) != 0x06 && !b)) |
| 7523 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 0); |
| 7524 | else if ((!a && (op1 & 0x17) == 0x06) |
| 7525 | || (a && (op1 & 0x17) == 0x06 && !b)) |
| 7526 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 0, 1, 1); |
| 7527 | else if ((!a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07) |
| 7528 | || (a && (op1 & 0x05) == 0x05 && (op1 & 0x17) != 0x07 && !b)) |
| 7529 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 0); |
| 7530 | else if ((!a && (op1 & 0x17) == 0x07) |
| 7531 | || (a && (op1 & 0x17) == 0x07 && !b)) |
| 7532 | return arm_copy_ldr_str_ldrb_strb (gdbarch, insn, regs, dsc, 1, 1, 1); |
| 7533 | |
| 7534 | /* Should be unreachable. */ |
| 7535 | return 1; |
| 7536 | } |
| 7537 | |
| 7538 | static int |
| 7539 | arm_decode_media (struct gdbarch *gdbarch, uint32_t insn, |
| 7540 | struct displaced_step_closure *dsc) |
| 7541 | { |
| 7542 | switch (bits (insn, 20, 24)) |
| 7543 | { |
| 7544 | case 0x00: case 0x01: case 0x02: case 0x03: |
| 7545 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub signed", dsc); |
| 7546 | |
| 7547 | case 0x04: case 0x05: case 0x06: case 0x07: |
| 7548 | return arm_copy_unmodified (gdbarch, insn, "parallel add/sub unsigned", dsc); |
| 7549 | |
| 7550 | case 0x08: case 0x09: case 0x0a: case 0x0b: |
| 7551 | case 0x0c: case 0x0d: case 0x0e: case 0x0f: |
| 7552 | return arm_copy_unmodified (gdbarch, insn, |
| 7553 | "decode/pack/unpack/saturate/reverse", dsc); |
| 7554 | |
| 7555 | case 0x18: |
| 7556 | if (bits (insn, 5, 7) == 0) /* op2. */ |
| 7557 | { |
| 7558 | if (bits (insn, 12, 15) == 0xf) |
| 7559 | return arm_copy_unmodified (gdbarch, insn, "usad8", dsc); |
| 7560 | else |
| 7561 | return arm_copy_unmodified (gdbarch, insn, "usada8", dsc); |
| 7562 | } |
| 7563 | else |
| 7564 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7565 | |
| 7566 | case 0x1a: case 0x1b: |
| 7567 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ |
| 7568 | return arm_copy_unmodified (gdbarch, insn, "sbfx", dsc); |
| 7569 | else |
| 7570 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7571 | |
| 7572 | case 0x1c: case 0x1d: |
| 7573 | if (bits (insn, 5, 6) == 0x0) /* op2[1:0]. */ |
| 7574 | { |
| 7575 | if (bits (insn, 0, 3) == 0xf) |
| 7576 | return arm_copy_unmodified (gdbarch, insn, "bfc", dsc); |
| 7577 | else |
| 7578 | return arm_copy_unmodified (gdbarch, insn, "bfi", dsc); |
| 7579 | } |
| 7580 | else |
| 7581 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7582 | |
| 7583 | case 0x1e: case 0x1f: |
| 7584 | if (bits (insn, 5, 6) == 0x2) /* op2[1:0]. */ |
| 7585 | return arm_copy_unmodified (gdbarch, insn, "ubfx", dsc); |
| 7586 | else |
| 7587 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7588 | } |
| 7589 | |
| 7590 | /* Should be unreachable. */ |
| 7591 | return 1; |
| 7592 | } |
| 7593 | |
| 7594 | static int |
| 7595 | arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, int32_t insn, |
| 7596 | struct regcache *regs, |
| 7597 | struct displaced_step_closure *dsc) |
| 7598 | { |
| 7599 | if (bit (insn, 25)) |
| 7600 | return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc); |
| 7601 | else |
| 7602 | return arm_copy_block_xfer (gdbarch, insn, regs, dsc); |
| 7603 | } |
| 7604 | |
| 7605 | static int |
| 7606 | arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn, |
| 7607 | struct regcache *regs, |
| 7608 | struct displaced_step_closure *dsc) |
| 7609 | { |
| 7610 | unsigned int opcode = bits (insn, 20, 24); |
| 7611 | |
| 7612 | switch (opcode) |
| 7613 | { |
| 7614 | case 0x04: case 0x05: /* VFP/Neon mrrc/mcrr. */ |
| 7615 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon mrrc/mcrr", dsc); |
| 7616 | |
| 7617 | case 0x08: case 0x0a: case 0x0c: case 0x0e: |
| 7618 | case 0x12: case 0x16: |
| 7619 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vstm/vpush", dsc); |
| 7620 | |
| 7621 | case 0x09: case 0x0b: case 0x0d: case 0x0f: |
| 7622 | case 0x13: case 0x17: |
| 7623 | return arm_copy_unmodified (gdbarch, insn, "vfp/neon vldm/vpop", dsc); |
| 7624 | |
| 7625 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ |
| 7626 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ |
| 7627 | /* Note: no writeback for these instructions. Bit 25 will always be |
| 7628 | zero though (via caller), so the following works OK. */ |
| 7629 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
| 7630 | } |
| 7631 | |
| 7632 | /* Should be unreachable. */ |
| 7633 | return 1; |
| 7634 | } |
| 7635 | |
| 7636 | /* Decode shifted register instructions. */ |
| 7637 | |
| 7638 | static int |
| 7639 | thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1, |
| 7640 | uint16_t insn2, struct regcache *regs, |
| 7641 | struct displaced_step_closure *dsc) |
| 7642 | { |
| 7643 | /* PC is only allowed to be used in instruction MOV. */ |
| 7644 | |
| 7645 | unsigned int op = bits (insn1, 5, 8); |
| 7646 | unsigned int rn = bits (insn1, 0, 3); |
| 7647 | |
| 7648 | if (op == 0x2 && rn == 0xf) /* MOV */ |
| 7649 | return thumb2_copy_alu_imm (gdbarch, insn1, insn2, regs, dsc); |
| 7650 | else |
| 7651 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7652 | "dp (shift reg)", dsc); |
| 7653 | } |
| 7654 | |
| 7655 | |
| 7656 | /* Decode extension register load/store. Exactly the same as |
| 7657 | arm_decode_ext_reg_ld_st. */ |
| 7658 | |
| 7659 | static int |
| 7660 | thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1, |
| 7661 | uint16_t insn2, struct regcache *regs, |
| 7662 | struct displaced_step_closure *dsc) |
| 7663 | { |
| 7664 | unsigned int opcode = bits (insn1, 4, 8); |
| 7665 | |
| 7666 | switch (opcode) |
| 7667 | { |
| 7668 | case 0x04: case 0x05: |
| 7669 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7670 | "vfp/neon vmov", dsc); |
| 7671 | |
| 7672 | case 0x08: case 0x0c: /* 01x00 */ |
| 7673 | case 0x0a: case 0x0e: /* 01x10 */ |
| 7674 | case 0x12: case 0x16: /* 10x10 */ |
| 7675 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7676 | "vfp/neon vstm/vpush", dsc); |
| 7677 | |
| 7678 | case 0x09: case 0x0d: /* 01x01 */ |
| 7679 | case 0x0b: case 0x0f: /* 01x11 */ |
| 7680 | case 0x13: case 0x17: /* 10x11 */ |
| 7681 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7682 | "vfp/neon vldm/vpop", dsc); |
| 7683 | |
| 7684 | case 0x10: case 0x14: case 0x18: case 0x1c: /* vstr. */ |
| 7685 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7686 | "vstr", dsc); |
| 7687 | case 0x11: case 0x15: case 0x19: case 0x1d: /* vldr. */ |
| 7688 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, regs, dsc); |
| 7689 | } |
| 7690 | |
| 7691 | /* Should be unreachable. */ |
| 7692 | return 1; |
| 7693 | } |
| 7694 | |
| 7695 | static int |
| 7696 | arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to, |
| 7697 | struct regcache *regs, struct displaced_step_closure *dsc) |
| 7698 | { |
| 7699 | unsigned int op1 = bits (insn, 20, 25); |
| 7700 | int op = bit (insn, 4); |
| 7701 | unsigned int coproc = bits (insn, 8, 11); |
| 7702 | unsigned int rn = bits (insn, 16, 19); |
| 7703 | |
| 7704 | if ((op1 & 0x20) == 0x00 && (op1 & 0x3a) != 0x00 && (coproc & 0xe) == 0xa) |
| 7705 | return arm_decode_ext_reg_ld_st (gdbarch, insn, regs, dsc); |
| 7706 | else if ((op1 & 0x21) == 0x00 && (op1 & 0x3a) != 0x00 |
| 7707 | && (coproc & 0xe) != 0xa) |
| 7708 | /* stc/stc2. */ |
| 7709 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
| 7710 | else if ((op1 & 0x21) == 0x01 && (op1 & 0x3a) != 0x00 |
| 7711 | && (coproc & 0xe) != 0xa) |
| 7712 | /* ldc/ldc2 imm/lit. */ |
| 7713 | return arm_copy_copro_load_store (gdbarch, insn, regs, dsc); |
| 7714 | else if ((op1 & 0x3e) == 0x00) |
| 7715 | return arm_copy_undef (gdbarch, insn, dsc); |
| 7716 | else if ((op1 & 0x3e) == 0x04 && (coproc & 0xe) == 0xa) |
| 7717 | return arm_copy_unmodified (gdbarch, insn, "neon 64bit xfer", dsc); |
| 7718 | else if (op1 == 0x04 && (coproc & 0xe) != 0xa) |
| 7719 | return arm_copy_unmodified (gdbarch, insn, "mcrr/mcrr2", dsc); |
| 7720 | else if (op1 == 0x05 && (coproc & 0xe) != 0xa) |
| 7721 | return arm_copy_unmodified (gdbarch, insn, "mrrc/mrrc2", dsc); |
| 7722 | else if ((op1 & 0x30) == 0x20 && !op) |
| 7723 | { |
| 7724 | if ((coproc & 0xe) == 0xa) |
| 7725 | return arm_copy_unmodified (gdbarch, insn, "vfp dataproc", dsc); |
| 7726 | else |
| 7727 | return arm_copy_unmodified (gdbarch, insn, "cdp/cdp2", dsc); |
| 7728 | } |
| 7729 | else if ((op1 & 0x30) == 0x20 && op) |
| 7730 | return arm_copy_unmodified (gdbarch, insn, "neon 8/16/32 bit xfer", dsc); |
| 7731 | else if ((op1 & 0x31) == 0x20 && op && (coproc & 0xe) != 0xa) |
| 7732 | return arm_copy_unmodified (gdbarch, insn, "mcr/mcr2", dsc); |
| 7733 | else if ((op1 & 0x31) == 0x21 && op && (coproc & 0xe) != 0xa) |
| 7734 | return arm_copy_unmodified (gdbarch, insn, "mrc/mrc2", dsc); |
| 7735 | else if ((op1 & 0x30) == 0x30) |
| 7736 | return arm_copy_svc (gdbarch, insn, regs, dsc); |
| 7737 | else |
| 7738 | return arm_copy_undef (gdbarch, insn, dsc); /* Possibly unreachable. */ |
| 7739 | } |
| 7740 | |
| 7741 | static int |
| 7742 | thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1, |
| 7743 | uint16_t insn2, struct regcache *regs, |
| 7744 | struct displaced_step_closure *dsc) |
| 7745 | { |
| 7746 | unsigned int coproc = bits (insn2, 8, 11); |
| 7747 | unsigned int op1 = bits (insn1, 4, 9); |
| 7748 | unsigned int bit_5_8 = bits (insn1, 5, 8); |
| 7749 | unsigned int bit_9 = bit (insn1, 9); |
| 7750 | unsigned int bit_4 = bit (insn1, 4); |
| 7751 | unsigned int rn = bits (insn1, 0, 3); |
| 7752 | |
| 7753 | if (bit_9 == 0) |
| 7754 | { |
| 7755 | if (bit_5_8 == 2) |
| 7756 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7757 | "neon 64bit xfer/mrrc/mrrc2/mcrr/mcrr2", |
| 7758 | dsc); |
| 7759 | else if (bit_5_8 == 0) /* UNDEFINED. */ |
| 7760 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); |
| 7761 | else |
| 7762 | { |
| 7763 | /*coproc is 101x. SIMD/VFP, ext registers load/store. */ |
| 7764 | if ((coproc & 0xe) == 0xa) |
| 7765 | return thumb2_decode_ext_reg_ld_st (gdbarch, insn1, insn2, regs, |
| 7766 | dsc); |
| 7767 | else /* coproc is not 101x. */ |
| 7768 | { |
| 7769 | if (bit_4 == 0) /* STC/STC2. */ |
| 7770 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 7771 | "stc/stc2", dsc); |
| 7772 | else /* LDC/LDC2 {literal, immeidate}. */ |
| 7773 | return thumb2_copy_copro_load_store (gdbarch, insn1, insn2, |
| 7774 | regs, dsc); |
| 7775 | } |
| 7776 | } |
| 7777 | } |
| 7778 | else |
| 7779 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, "coproc", dsc); |
| 7780 | |
| 7781 | return 0; |
| 7782 | } |
| 7783 | |
| 7784 | static void |
| 7785 | install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs, |
| 7786 | struct displaced_step_closure *dsc, int rd) |
| 7787 | { |
| 7788 | /* ADR Rd, #imm |
| 7789 | |
| 7790 | Rewrite as: |
| 7791 | |
| 7792 | Preparation: Rd <- PC |
| 7793 | Insn: ADD Rd, #imm |
| 7794 | Cleanup: Null. |
| 7795 | */ |
| 7796 | |
| 7797 | /* Rd <- PC */ |
| 7798 | int val = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); |
| 7799 | displaced_write_reg (regs, dsc, rd, val, CANNOT_WRITE_PC); |
| 7800 | } |
| 7801 | |
| 7802 | static int |
| 7803 | thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs, |
| 7804 | struct displaced_step_closure *dsc, |
| 7805 | int rd, unsigned int imm) |
| 7806 | { |
| 7807 | |
| 7808 | /* Encoding T2: ADDS Rd, #imm */ |
| 7809 | dsc->modinsn[0] = (0x3000 | (rd << 8) | imm); |
| 7810 | |
| 7811 | install_pc_relative (gdbarch, regs, dsc, rd); |
| 7812 | |
| 7813 | return 0; |
| 7814 | } |
| 7815 | |
| 7816 | static int |
| 7817 | thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn, |
| 7818 | struct regcache *regs, |
| 7819 | struct displaced_step_closure *dsc) |
| 7820 | { |
| 7821 | unsigned int rd = bits (insn, 8, 10); |
| 7822 | unsigned int imm8 = bits (insn, 0, 7); |
| 7823 | |
| 7824 | if (debug_displaced) |
| 7825 | fprintf_unfiltered (gdb_stdlog, |
| 7826 | "displaced: copying thumb adr r%d, #%d insn %.4x\n", |
| 7827 | rd, imm8, insn); |
| 7828 | |
| 7829 | return thumb_copy_pc_relative_16bit (gdbarch, regs, dsc, rd, imm8); |
| 7830 | } |
| 7831 | |
| 7832 | static int |
| 7833 | thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1, |
| 7834 | uint16_t insn2, struct regcache *regs, |
| 7835 | struct displaced_step_closure *dsc) |
| 7836 | { |
| 7837 | unsigned int rd = bits (insn2, 8, 11); |
| 7838 | /* Since immediate has the same encoding in ADR ADD and SUB, so we simply |
| 7839 | extract raw immediate encoding rather than computing immediate. When |
| 7840 | generating ADD or SUB instruction, we can simply perform OR operation to |
| 7841 | set immediate into ADD. */ |
| 7842 | unsigned int imm_3_8 = insn2 & 0x70ff; |
| 7843 | unsigned int imm_i = insn1 & 0x0400; /* Clear all bits except bit 10. */ |
| 7844 | |
| 7845 | if (debug_displaced) |
| 7846 | fprintf_unfiltered (gdb_stdlog, |
| 7847 | "displaced: copying thumb adr r%d, #%d:%d insn %.4x%.4x\n", |
| 7848 | rd, imm_i, imm_3_8, insn1, insn2); |
| 7849 | |
| 7850 | if (bit (insn1, 7)) /* Encoding T2 */ |
| 7851 | { |
| 7852 | /* Encoding T3: SUB Rd, Rd, #imm */ |
| 7853 | dsc->modinsn[0] = (0xf1a0 | rd | imm_i); |
| 7854 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); |
| 7855 | } |
| 7856 | else /* Encoding T3 */ |
| 7857 | { |
| 7858 | /* Encoding T3: ADD Rd, Rd, #imm */ |
| 7859 | dsc->modinsn[0] = (0xf100 | rd | imm_i); |
| 7860 | dsc->modinsn[1] = ((rd << 8) | imm_3_8); |
| 7861 | } |
| 7862 | dsc->numinsns = 2; |
| 7863 | |
| 7864 | install_pc_relative (gdbarch, regs, dsc, rd); |
| 7865 | |
| 7866 | return 0; |
| 7867 | } |
| 7868 | |
| 7869 | static int |
| 7870 | thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, unsigned short insn1, |
| 7871 | struct regcache *regs, |
| 7872 | struct displaced_step_closure *dsc) |
| 7873 | { |
| 7874 | unsigned int rt = bits (insn1, 8, 10); |
| 7875 | unsigned int pc; |
| 7876 | int imm8 = (bits (insn1, 0, 7) << 2); |
| 7877 | CORE_ADDR from = dsc->insn_addr; |
| 7878 | |
| 7879 | /* LDR Rd, #imm8 |
| 7880 | |
| 7881 | Rwrite as: |
| 7882 | |
| 7883 | Preparation: tmp0 <- R0, tmp2 <- R2, tmp3 <- R3, R2 <- PC, R3 <- #imm8; |
| 7884 | |
| 7885 | Insn: LDR R0, [R2, R3]; |
| 7886 | Cleanup: R2 <- tmp2, R3 <- tmp3, Rd <- R0, R0 <- tmp0 */ |
| 7887 | |
| 7888 | if (debug_displaced) |
| 7889 | fprintf_unfiltered (gdb_stdlog, |
| 7890 | "displaced: copying thumb ldr r%d [pc #%d]\n" |
| 7891 | , rt, imm8); |
| 7892 | |
| 7893 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 0); |
| 7894 | dsc->tmp[2] = displaced_read_reg (regs, dsc, 2); |
| 7895 | dsc->tmp[3] = displaced_read_reg (regs, dsc, 3); |
| 7896 | pc = displaced_read_reg (regs, dsc, ARM_PC_REGNUM); |
| 7897 | /* The assembler calculates the required value of the offset from the |
| 7898 | Align(PC,4) value of this instruction to the label. */ |
| 7899 | pc = pc & 0xfffffffc; |
| 7900 | |
| 7901 | displaced_write_reg (regs, dsc, 2, pc, CANNOT_WRITE_PC); |
| 7902 | displaced_write_reg (regs, dsc, 3, imm8, CANNOT_WRITE_PC); |
| 7903 | |
| 7904 | dsc->rd = rt; |
| 7905 | dsc->u.ldst.xfersize = 4; |
| 7906 | dsc->u.ldst.rn = 0; |
| 7907 | dsc->u.ldst.immed = 0; |
| 7908 | dsc->u.ldst.writeback = 0; |
| 7909 | dsc->u.ldst.restore_r4 = 0; |
| 7910 | |
| 7911 | dsc->modinsn[0] = 0x58d0; /* ldr r0, [r2, r3]*/ |
| 7912 | |
| 7913 | dsc->cleanup = &cleanup_load; |
| 7914 | |
| 7915 | return 0; |
| 7916 | } |
| 7917 | |
| 7918 | /* Copy Thumb cbnz/cbz insruction. */ |
| 7919 | |
| 7920 | static int |
| 7921 | thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1, |
| 7922 | struct regcache *regs, |
| 7923 | struct displaced_step_closure *dsc) |
| 7924 | { |
| 7925 | int non_zero = bit (insn1, 11); |
| 7926 | unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1); |
| 7927 | CORE_ADDR from = dsc->insn_addr; |
| 7928 | int rn = bits (insn1, 0, 2); |
| 7929 | int rn_val = displaced_read_reg (regs, dsc, rn); |
| 7930 | |
| 7931 | dsc->u.branch.cond = (rn_val && non_zero) || (!rn_val && !non_zero); |
| 7932 | /* CBNZ and CBZ do not affect the condition flags. If condition is true, |
| 7933 | set it INST_AL, so cleanup_branch will know branch is taken, otherwise, |
| 7934 | condition is false, let it be, cleanup_branch will do nothing. */ |
| 7935 | if (dsc->u.branch.cond) |
| 7936 | { |
| 7937 | dsc->u.branch.cond = INST_AL; |
| 7938 | dsc->u.branch.dest = from + 4 + imm5; |
| 7939 | } |
| 7940 | else |
| 7941 | dsc->u.branch.dest = from + 2; |
| 7942 | |
| 7943 | dsc->u.branch.link = 0; |
| 7944 | dsc->u.branch.exchange = 0; |
| 7945 | |
| 7946 | if (debug_displaced) |
| 7947 | fprintf_unfiltered (gdb_stdlog, "displaced: copying %s [r%d = 0x%x]" |
| 7948 | " insn %.4x to %.8lx\n", non_zero ? "cbnz" : "cbz", |
| 7949 | rn, rn_val, insn1, dsc->u.branch.dest); |
| 7950 | |
| 7951 | dsc->modinsn[0] = THUMB_NOP; |
| 7952 | |
| 7953 | dsc->cleanup = &cleanup_branch; |
| 7954 | return 0; |
| 7955 | } |
| 7956 | |
| 7957 | /* Copy Table Branch Byte/Halfword */ |
| 7958 | static int |
| 7959 | thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1, |
| 7960 | uint16_t insn2, struct regcache *regs, |
| 7961 | struct displaced_step_closure *dsc) |
| 7962 | { |
| 7963 | ULONGEST rn_val, rm_val; |
| 7964 | int is_tbh = bit (insn2, 4); |
| 7965 | CORE_ADDR halfwords = 0; |
| 7966 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 7967 | |
| 7968 | rn_val = displaced_read_reg (regs, dsc, bits (insn1, 0, 3)); |
| 7969 | rm_val = displaced_read_reg (regs, dsc, bits (insn2, 0, 3)); |
| 7970 | |
| 7971 | if (is_tbh) |
| 7972 | { |
| 7973 | gdb_byte buf[2]; |
| 7974 | |
| 7975 | target_read_memory (rn_val + 2 * rm_val, buf, 2); |
| 7976 | halfwords = extract_unsigned_integer (buf, 2, byte_order); |
| 7977 | } |
| 7978 | else |
| 7979 | { |
| 7980 | gdb_byte buf[1]; |
| 7981 | |
| 7982 | target_read_memory (rn_val + rm_val, buf, 1); |
| 7983 | halfwords = extract_unsigned_integer (buf, 1, byte_order); |
| 7984 | } |
| 7985 | |
| 7986 | if (debug_displaced) |
| 7987 | fprintf_unfiltered (gdb_stdlog, "displaced: %s base 0x%x offset 0x%x" |
| 7988 | " offset 0x%x\n", is_tbh ? "tbh" : "tbb", |
| 7989 | (unsigned int) rn_val, (unsigned int) rm_val, |
| 7990 | (unsigned int) halfwords); |
| 7991 | |
| 7992 | dsc->u.branch.cond = INST_AL; |
| 7993 | dsc->u.branch.link = 0; |
| 7994 | dsc->u.branch.exchange = 0; |
| 7995 | dsc->u.branch.dest = dsc->insn_addr + 4 + 2 * halfwords; |
| 7996 | |
| 7997 | dsc->cleanup = &cleanup_branch; |
| 7998 | |
| 7999 | return 0; |
| 8000 | } |
| 8001 | |
| 8002 | static void |
| 8003 | cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs, |
| 8004 | struct displaced_step_closure *dsc) |
| 8005 | { |
| 8006 | /* PC <- r7 */ |
| 8007 | int val = displaced_read_reg (regs, dsc, 7); |
| 8008 | displaced_write_reg (regs, dsc, ARM_PC_REGNUM, val, BX_WRITE_PC); |
| 8009 | |
| 8010 | /* r7 <- r8 */ |
| 8011 | val = displaced_read_reg (regs, dsc, 8); |
| 8012 | displaced_write_reg (regs, dsc, 7, val, CANNOT_WRITE_PC); |
| 8013 | |
| 8014 | /* r8 <- tmp[0] */ |
| 8015 | displaced_write_reg (regs, dsc, 8, dsc->tmp[0], CANNOT_WRITE_PC); |
| 8016 | |
| 8017 | } |
| 8018 | |
| 8019 | static int |
| 8020 | thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, unsigned short insn1, |
| 8021 | struct regcache *regs, |
| 8022 | struct displaced_step_closure *dsc) |
| 8023 | { |
| 8024 | dsc->u.block.regmask = insn1 & 0x00ff; |
| 8025 | |
| 8026 | /* Rewrite instruction: POP {rX, rY, ...,rZ, PC} |
| 8027 | to : |
| 8028 | |
| 8029 | (1) register list is full, that is, r0-r7 are used. |
| 8030 | Prepare: tmp[0] <- r8 |
| 8031 | |
| 8032 | POP {r0, r1, ...., r6, r7}; remove PC from reglist |
| 8033 | MOV r8, r7; Move value of r7 to r8; |
| 8034 | POP {r7}; Store PC value into r7. |
| 8035 | |
| 8036 | Cleanup: PC <- r7, r7 <- r8, r8 <-tmp[0] |
| 8037 | |
| 8038 | (2) register list is not full, supposing there are N registers in |
| 8039 | register list (except PC, 0 <= N <= 7). |
| 8040 | Prepare: for each i, 0 - N, tmp[i] <- ri. |
| 8041 | |
| 8042 | POP {r0, r1, ...., rN}; |
| 8043 | |
| 8044 | Cleanup: Set registers in original reglist from r0 - rN. Restore r0 - rN |
| 8045 | from tmp[] properly. |
| 8046 | */ |
| 8047 | if (debug_displaced) |
| 8048 | fprintf_unfiltered (gdb_stdlog, |
| 8049 | "displaced: copying thumb pop {%.8x, pc} insn %.4x\n", |
| 8050 | dsc->u.block.regmask, insn1); |
| 8051 | |
| 8052 | if (dsc->u.block.regmask == 0xff) |
| 8053 | { |
| 8054 | dsc->tmp[0] = displaced_read_reg (regs, dsc, 8); |
| 8055 | |
| 8056 | dsc->modinsn[0] = (insn1 & 0xfeff); /* POP {r0,r1,...,r6, r7} */ |
| 8057 | dsc->modinsn[1] = 0x46b8; /* MOV r8, r7 */ |
| 8058 | dsc->modinsn[2] = 0xbc80; /* POP {r7} */ |
| 8059 | |
| 8060 | dsc->numinsns = 3; |
| 8061 | dsc->cleanup = &cleanup_pop_pc_16bit_all; |
| 8062 | } |
| 8063 | else |
| 8064 | { |
| 8065 | unsigned int num_in_list = bitcount (dsc->u.block.regmask); |
| 8066 | unsigned int new_regmask, bit = 1; |
| 8067 | unsigned int to = 0, from = 0, i, new_rn; |
| 8068 | |
| 8069 | for (i = 0; i < num_in_list + 1; i++) |
| 8070 | dsc->tmp[i] = displaced_read_reg (regs, dsc, i); |
| 8071 | |
| 8072 | new_regmask = (1 << (num_in_list + 1)) - 1; |
| 8073 | |
| 8074 | if (debug_displaced) |
| 8075 | fprintf_unfiltered (gdb_stdlog, _("displaced: POP " |
| 8076 | "{..., pc}: original reg list %.4x," |
| 8077 | " modified list %.4x\n"), |
| 8078 | (int) dsc->u.block.regmask, new_regmask); |
| 8079 | |
| 8080 | dsc->u.block.regmask |= 0x8000; |
| 8081 | dsc->u.block.writeback = 0; |
| 8082 | dsc->u.block.cond = INST_AL; |
| 8083 | |
| 8084 | dsc->modinsn[0] = (insn1 & ~0x1ff) | (new_regmask & 0xff); |
| 8085 | |
| 8086 | dsc->cleanup = &cleanup_block_load_pc; |
| 8087 | } |
| 8088 | |
| 8089 | return 0; |
| 8090 | } |
| 8091 | |
| 8092 | static void |
| 8093 | thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1, |
| 8094 | struct regcache *regs, |
| 8095 | struct displaced_step_closure *dsc) |
| 8096 | { |
| 8097 | unsigned short op_bit_12_15 = bits (insn1, 12, 15); |
| 8098 | unsigned short op_bit_10_11 = bits (insn1, 10, 11); |
| 8099 | int err = 0; |
| 8100 | |
| 8101 | /* 16-bit thumb instructions. */ |
| 8102 | switch (op_bit_12_15) |
| 8103 | { |
| 8104 | /* Shift (imme), add, subtract, move and compare. */ |
| 8105 | case 0: case 1: case 2: case 3: |
| 8106 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, |
| 8107 | "shift/add/sub/mov/cmp", |
| 8108 | dsc); |
| 8109 | break; |
| 8110 | case 4: |
| 8111 | switch (op_bit_10_11) |
| 8112 | { |
| 8113 | case 0: /* Data-processing */ |
| 8114 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, |
| 8115 | "data-processing", |
| 8116 | dsc); |
| 8117 | break; |
| 8118 | case 1: /* Special data instructions and branch and exchange. */ |
| 8119 | { |
| 8120 | unsigned short op = bits (insn1, 7, 9); |
| 8121 | if (op == 6 || op == 7) /* BX or BLX */ |
| 8122 | err = thumb_copy_bx_blx_reg (gdbarch, insn1, regs, dsc); |
| 8123 | else if (bits (insn1, 6, 7) != 0) /* ADD/MOV/CMP high registers. */ |
| 8124 | err = thumb_copy_alu_reg (gdbarch, insn1, regs, dsc); |
| 8125 | else |
| 8126 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "special data", |
| 8127 | dsc); |
| 8128 | } |
| 8129 | break; |
| 8130 | default: /* LDR (literal) */ |
| 8131 | err = thumb_copy_16bit_ldr_literal (gdbarch, insn1, regs, dsc); |
| 8132 | } |
| 8133 | break; |
| 8134 | case 5: case 6: case 7: case 8: case 9: /* Load/Store single data item */ |
| 8135 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldr/str", dsc); |
| 8136 | break; |
| 8137 | case 10: |
| 8138 | if (op_bit_10_11 < 2) /* Generate PC-relative address */ |
| 8139 | err = thumb_decode_pc_relative_16bit (gdbarch, insn1, regs, dsc); |
| 8140 | else /* Generate SP-relative address */ |
| 8141 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "sp-relative", dsc); |
| 8142 | break; |
| 8143 | case 11: /* Misc 16-bit instructions */ |
| 8144 | { |
| 8145 | switch (bits (insn1, 8, 11)) |
| 8146 | { |
| 8147 | case 1: case 3: case 9: case 11: /* CBNZ, CBZ */ |
| 8148 | err = thumb_copy_cbnz_cbz (gdbarch, insn1, regs, dsc); |
| 8149 | break; |
| 8150 | case 12: case 13: /* POP */ |
| 8151 | if (bit (insn1, 8)) /* PC is in register list. */ |
| 8152 | err = thumb_copy_pop_pc_16bit (gdbarch, insn1, regs, dsc); |
| 8153 | else |
| 8154 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "pop", dsc); |
| 8155 | break; |
| 8156 | case 15: /* If-Then, and hints */ |
| 8157 | if (bits (insn1, 0, 3)) |
| 8158 | /* If-Then makes up to four following instructions conditional. |
| 8159 | IT instruction itself is not conditional, so handle it as a |
| 8160 | common unmodified instruction. */ |
| 8161 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "If-Then", |
| 8162 | dsc); |
| 8163 | else |
| 8164 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "hints", dsc); |
| 8165 | break; |
| 8166 | default: |
| 8167 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "misc", dsc); |
| 8168 | } |
| 8169 | } |
| 8170 | break; |
| 8171 | case 12: |
| 8172 | if (op_bit_10_11 < 2) /* Store multiple registers */ |
| 8173 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "stm", dsc); |
| 8174 | else /* Load multiple registers */ |
| 8175 | err = thumb_copy_unmodified_16bit (gdbarch, insn1, "ldm", dsc); |
| 8176 | break; |
| 8177 | case 13: /* Conditional branch and supervisor call */ |
| 8178 | if (bits (insn1, 9, 11) != 7) /* conditional branch */ |
| 8179 | err = thumb_copy_b (gdbarch, insn1, dsc); |
| 8180 | else |
| 8181 | err = thumb_copy_svc (gdbarch, insn1, regs, dsc); |
| 8182 | break; |
| 8183 | case 14: /* Unconditional branch */ |
| 8184 | err = thumb_copy_b (gdbarch, insn1, dsc); |
| 8185 | break; |
| 8186 | default: |
| 8187 | err = 1; |
| 8188 | } |
| 8189 | |
| 8190 | if (err) |
| 8191 | internal_error (__FILE__, __LINE__, |
| 8192 | _("thumb_process_displaced_16bit_insn: Instruction decode error")); |
| 8193 | } |
| 8194 | |
| 8195 | static int |
| 8196 | decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch, |
| 8197 | uint16_t insn1, uint16_t insn2, |
| 8198 | struct regcache *regs, |
| 8199 | struct displaced_step_closure *dsc) |
| 8200 | { |
| 8201 | int rt = bits (insn2, 12, 15); |
| 8202 | int rn = bits (insn1, 0, 3); |
| 8203 | int op1 = bits (insn1, 7, 8); |
| 8204 | int err = 0; |
| 8205 | |
| 8206 | switch (bits (insn1, 5, 6)) |
| 8207 | { |
| 8208 | case 0: /* Load byte and memory hints */ |
| 8209 | if (rt == 0xf) /* PLD/PLI */ |
| 8210 | { |
| 8211 | if (rn == 0xf) |
| 8212 | /* PLD literal or Encoding T3 of PLI(immediate, literal). */ |
| 8213 | return thumb2_copy_preload (gdbarch, insn1, insn2, regs, dsc); |
| 8214 | else |
| 8215 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8216 | "pli/pld", dsc); |
| 8217 | } |
| 8218 | else |
| 8219 | { |
| 8220 | if (rn == 0xf) /* LDRB/LDRSB (literal) */ |
| 8221 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, |
| 8222 | 1); |
| 8223 | else |
| 8224 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8225 | "ldrb{reg, immediate}/ldrbt", |
| 8226 | dsc); |
| 8227 | } |
| 8228 | |
| 8229 | break; |
| 8230 | case 1: /* Load halfword and memory hints. */ |
| 8231 | if (rt == 0xf) /* PLD{W} and Unalloc memory hint. */ |
| 8232 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8233 | "pld/unalloc memhint", dsc); |
| 8234 | else |
| 8235 | { |
| 8236 | if (rn == 0xf) |
| 8237 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, |
| 8238 | 2); |
| 8239 | else |
| 8240 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8241 | "ldrh/ldrht", dsc); |
| 8242 | } |
| 8243 | break; |
| 8244 | case 2: /* Load word */ |
| 8245 | { |
| 8246 | int insn2_bit_8_11 = bits (insn2, 8, 11); |
| 8247 | |
| 8248 | if (rn == 0xf) |
| 8249 | return thumb2_copy_load_literal (gdbarch, insn1, insn2, regs, dsc, 4); |
| 8250 | else if (op1 == 0x1) /* Encoding T3 */ |
| 8251 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, dsc, |
| 8252 | 0, 1); |
| 8253 | else /* op1 == 0x0 */ |
| 8254 | { |
| 8255 | if (insn2_bit_8_11 == 0xc || (insn2_bit_8_11 & 0x9) == 0x9) |
| 8256 | /* LDR (immediate) */ |
| 8257 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, |
| 8258 | dsc, bit (insn2, 8), 1); |
| 8259 | else if (insn2_bit_8_11 == 0xe) /* LDRT */ |
| 8260 | return thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8261 | "ldrt", dsc); |
| 8262 | else |
| 8263 | /* LDR (register) */ |
| 8264 | return thumb2_copy_load_reg_imm (gdbarch, insn1, insn2, regs, |
| 8265 | dsc, 0, 0); |
| 8266 | } |
| 8267 | break; |
| 8268 | } |
| 8269 | default: |
| 8270 | return thumb_32bit_copy_undef (gdbarch, insn1, insn2, dsc); |
| 8271 | break; |
| 8272 | } |
| 8273 | return 0; |
| 8274 | } |
| 8275 | |
| 8276 | static void |
| 8277 | thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1, |
| 8278 | uint16_t insn2, struct regcache *regs, |
| 8279 | struct displaced_step_closure *dsc) |
| 8280 | { |
| 8281 | int err = 0; |
| 8282 | unsigned short op = bit (insn2, 15); |
| 8283 | unsigned int op1 = bits (insn1, 11, 12); |
| 8284 | |
| 8285 | switch (op1) |
| 8286 | { |
| 8287 | case 1: |
| 8288 | { |
| 8289 | switch (bits (insn1, 9, 10)) |
| 8290 | { |
| 8291 | case 0: |
| 8292 | if (bit (insn1, 6)) |
| 8293 | { |
| 8294 | /* Load/store {dual, execlusive}, table branch. */ |
| 8295 | if (bits (insn1, 7, 8) == 1 && bits (insn1, 4, 5) == 1 |
| 8296 | && bits (insn2, 5, 7) == 0) |
| 8297 | err = thumb2_copy_table_branch (gdbarch, insn1, insn2, regs, |
| 8298 | dsc); |
| 8299 | else |
| 8300 | /* PC is not allowed to use in load/store {dual, exclusive} |
| 8301 | instructions. */ |
| 8302 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8303 | "load/store dual/ex", dsc); |
| 8304 | } |
| 8305 | else /* load/store multiple */ |
| 8306 | { |
| 8307 | switch (bits (insn1, 7, 8)) |
| 8308 | { |
| 8309 | case 0: case 3: /* SRS, RFE */ |
| 8310 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8311 | "srs/rfe", dsc); |
| 8312 | break; |
| 8313 | case 1: case 2: /* LDM/STM/PUSH/POP */ |
| 8314 | err = thumb2_copy_block_xfer (gdbarch, insn1, insn2, regs, dsc); |
| 8315 | break; |
| 8316 | } |
| 8317 | } |
| 8318 | break; |
| 8319 | |
| 8320 | case 1: |
| 8321 | /* Data-processing (shift register). */ |
| 8322 | err = thumb2_decode_dp_shift_reg (gdbarch, insn1, insn2, regs, |
| 8323 | dsc); |
| 8324 | break; |
| 8325 | default: /* Coprocessor instructions. */ |
| 8326 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); |
| 8327 | break; |
| 8328 | } |
| 8329 | break; |
| 8330 | } |
| 8331 | case 2: /* op1 = 2 */ |
| 8332 | if (op) /* Branch and misc control. */ |
| 8333 | { |
| 8334 | if (bit (insn2, 14) /* BLX/BL */ |
| 8335 | || bit (insn2, 12) /* Unconditional branch */ |
| 8336 | || (bits (insn1, 7, 9) != 0x7)) /* Conditional branch */ |
| 8337 | err = thumb2_copy_b_bl_blx (gdbarch, insn1, insn2, regs, dsc); |
| 8338 | else |
| 8339 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8340 | "misc ctrl", dsc); |
| 8341 | } |
| 8342 | else |
| 8343 | { |
| 8344 | if (bit (insn1, 9)) /* Data processing (plain binary imm). */ |
| 8345 | { |
| 8346 | int op = bits (insn1, 4, 8); |
| 8347 | int rn = bits (insn1, 0, 3); |
| 8348 | if ((op == 0 || op == 0xa) && rn == 0xf) |
| 8349 | err = thumb_copy_pc_relative_32bit (gdbarch, insn1, insn2, |
| 8350 | regs, dsc); |
| 8351 | else |
| 8352 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8353 | "dp/pb", dsc); |
| 8354 | } |
| 8355 | else /* Data processing (modified immeidate) */ |
| 8356 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8357 | "dp/mi", dsc); |
| 8358 | } |
| 8359 | break; |
| 8360 | case 3: /* op1 = 3 */ |
| 8361 | switch (bits (insn1, 9, 10)) |
| 8362 | { |
| 8363 | case 0: |
| 8364 | if (bit (insn1, 4)) |
| 8365 | err = decode_thumb_32bit_ld_mem_hints (gdbarch, insn1, insn2, |
| 8366 | regs, dsc); |
| 8367 | else /* NEON Load/Store and Store single data item */ |
| 8368 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8369 | "neon elt/struct load/store", |
| 8370 | dsc); |
| 8371 | break; |
| 8372 | case 1: /* op1 = 3, bits (9, 10) == 1 */ |
| 8373 | switch (bits (insn1, 7, 8)) |
| 8374 | { |
| 8375 | case 0: case 1: /* Data processing (register) */ |
| 8376 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8377 | "dp(reg)", dsc); |
| 8378 | break; |
| 8379 | case 2: /* Multiply and absolute difference */ |
| 8380 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8381 | "mul/mua/diff", dsc); |
| 8382 | break; |
| 8383 | case 3: /* Long multiply and divide */ |
| 8384 | err = thumb_copy_unmodified_32bit (gdbarch, insn1, insn2, |
| 8385 | "lmul/lmua", dsc); |
| 8386 | break; |
| 8387 | } |
| 8388 | break; |
| 8389 | default: /* Coprocessor instructions */ |
| 8390 | err = thumb2_decode_svc_copro (gdbarch, insn1, insn2, regs, dsc); |
| 8391 | break; |
| 8392 | } |
| 8393 | break; |
| 8394 | default: |
| 8395 | err = 1; |
| 8396 | } |
| 8397 | |
| 8398 | if (err) |
| 8399 | internal_error (__FILE__, __LINE__, |
| 8400 | _("thumb_process_displaced_32bit_insn: Instruction decode error")); |
| 8401 | |
| 8402 | } |
| 8403 | |
| 8404 | static void |
| 8405 | thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
| 8406 | CORE_ADDR to, struct regcache *regs, |
| 8407 | struct displaced_step_closure *dsc) |
| 8408 | { |
| 8409 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 8410 | uint16_t insn1 |
| 8411 | = read_memory_unsigned_integer (from, 2, byte_order_for_code); |
| 8412 | |
| 8413 | if (debug_displaced) |
| 8414 | fprintf_unfiltered (gdb_stdlog, "displaced: process thumb insn %.4x " |
| 8415 | "at %.8lx\n", insn1, (unsigned long) from); |
| 8416 | |
| 8417 | dsc->is_thumb = 1; |
| 8418 | dsc->insn_size = thumb_insn_size (insn1); |
| 8419 | if (thumb_insn_size (insn1) == 4) |
| 8420 | { |
| 8421 | uint16_t insn2 |
| 8422 | = read_memory_unsigned_integer (from + 2, 2, byte_order_for_code); |
| 8423 | thumb_process_displaced_32bit_insn (gdbarch, insn1, insn2, regs, dsc); |
| 8424 | } |
| 8425 | else |
| 8426 | thumb_process_displaced_16bit_insn (gdbarch, insn1, regs, dsc); |
| 8427 | } |
| 8428 | |
| 8429 | void |
| 8430 | arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from, |
| 8431 | CORE_ADDR to, struct regcache *regs, |
| 8432 | struct displaced_step_closure *dsc) |
| 8433 | { |
| 8434 | int err = 0; |
| 8435 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 8436 | uint32_t insn; |
| 8437 | |
| 8438 | /* Most displaced instructions use a 1-instruction scratch space, so set this |
| 8439 | here and override below if/when necessary. */ |
| 8440 | dsc->numinsns = 1; |
| 8441 | dsc->insn_addr = from; |
| 8442 | dsc->scratch_base = to; |
| 8443 | dsc->cleanup = NULL; |
| 8444 | dsc->wrote_to_pc = 0; |
| 8445 | |
| 8446 | if (!displaced_in_arm_mode (regs)) |
| 8447 | return thumb_process_displaced_insn (gdbarch, from, to, regs, dsc); |
| 8448 | |
| 8449 | dsc->is_thumb = 0; |
| 8450 | dsc->insn_size = 4; |
| 8451 | insn = read_memory_unsigned_integer (from, 4, byte_order_for_code); |
| 8452 | if (debug_displaced) |
| 8453 | fprintf_unfiltered (gdb_stdlog, "displaced: stepping insn %.8lx " |
| 8454 | "at %.8lx\n", (unsigned long) insn, |
| 8455 | (unsigned long) from); |
| 8456 | |
| 8457 | if ((insn & 0xf0000000) == 0xf0000000) |
| 8458 | err = arm_decode_unconditional (gdbarch, insn, regs, dsc); |
| 8459 | else switch (((insn & 0x10) >> 4) | ((insn & 0xe000000) >> 24)) |
| 8460 | { |
| 8461 | case 0x0: case 0x1: case 0x2: case 0x3: |
| 8462 | err = arm_decode_dp_misc (gdbarch, insn, regs, dsc); |
| 8463 | break; |
| 8464 | |
| 8465 | case 0x4: case 0x5: case 0x6: |
| 8466 | err = arm_decode_ld_st_word_ubyte (gdbarch, insn, regs, dsc); |
| 8467 | break; |
| 8468 | |
| 8469 | case 0x7: |
| 8470 | err = arm_decode_media (gdbarch, insn, dsc); |
| 8471 | break; |
| 8472 | |
| 8473 | case 0x8: case 0x9: case 0xa: case 0xb: |
| 8474 | err = arm_decode_b_bl_ldmstm (gdbarch, insn, regs, dsc); |
| 8475 | break; |
| 8476 | |
| 8477 | case 0xc: case 0xd: case 0xe: case 0xf: |
| 8478 | err = arm_decode_svc_copro (gdbarch, insn, to, regs, dsc); |
| 8479 | break; |
| 8480 | } |
| 8481 | |
| 8482 | if (err) |
| 8483 | internal_error (__FILE__, __LINE__, |
| 8484 | _("arm_process_displaced_insn: Instruction decode error")); |
| 8485 | } |
| 8486 | |
| 8487 | /* Actually set up the scratch space for a displaced instruction. */ |
| 8488 | |
| 8489 | void |
| 8490 | arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from, |
| 8491 | CORE_ADDR to, struct displaced_step_closure *dsc) |
| 8492 | { |
| 8493 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 8494 | unsigned int i, len, offset; |
| 8495 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 8496 | int size = dsc->is_thumb? 2 : 4; |
| 8497 | const unsigned char *bkp_insn; |
| 8498 | |
| 8499 | offset = 0; |
| 8500 | /* Poke modified instruction(s). */ |
| 8501 | for (i = 0; i < dsc->numinsns; i++) |
| 8502 | { |
| 8503 | if (debug_displaced) |
| 8504 | { |
| 8505 | fprintf_unfiltered (gdb_stdlog, "displaced: writing insn "); |
| 8506 | if (size == 4) |
| 8507 | fprintf_unfiltered (gdb_stdlog, "%.8lx", |
| 8508 | dsc->modinsn[i]); |
| 8509 | else if (size == 2) |
| 8510 | fprintf_unfiltered (gdb_stdlog, "%.4x", |
| 8511 | (unsigned short)dsc->modinsn[i]); |
| 8512 | |
| 8513 | fprintf_unfiltered (gdb_stdlog, " at %.8lx\n", |
| 8514 | (unsigned long) to + offset); |
| 8515 | |
| 8516 | } |
| 8517 | write_memory_unsigned_integer (to + offset, size, |
| 8518 | byte_order_for_code, |
| 8519 | dsc->modinsn[i]); |
| 8520 | offset += size; |
| 8521 | } |
| 8522 | |
| 8523 | /* Choose the correct breakpoint instruction. */ |
| 8524 | if (dsc->is_thumb) |
| 8525 | { |
| 8526 | bkp_insn = tdep->thumb_breakpoint; |
| 8527 | len = tdep->thumb_breakpoint_size; |
| 8528 | } |
| 8529 | else |
| 8530 | { |
| 8531 | bkp_insn = tdep->arm_breakpoint; |
| 8532 | len = tdep->arm_breakpoint_size; |
| 8533 | } |
| 8534 | |
| 8535 | /* Put breakpoint afterwards. */ |
| 8536 | write_memory (to + offset, bkp_insn, len); |
| 8537 | |
| 8538 | if (debug_displaced) |
| 8539 | fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ", |
| 8540 | paddress (gdbarch, from), paddress (gdbarch, to)); |
| 8541 | } |
| 8542 | |
| 8543 | /* Entry point for copying an instruction into scratch space for displaced |
| 8544 | stepping. */ |
| 8545 | |
| 8546 | struct displaced_step_closure * |
| 8547 | arm_displaced_step_copy_insn (struct gdbarch *gdbarch, |
| 8548 | CORE_ADDR from, CORE_ADDR to, |
| 8549 | struct regcache *regs) |
| 8550 | { |
| 8551 | struct displaced_step_closure *dsc |
| 8552 | = xmalloc (sizeof (struct displaced_step_closure)); |
| 8553 | arm_process_displaced_insn (gdbarch, from, to, regs, dsc); |
| 8554 | arm_displaced_init_closure (gdbarch, from, to, dsc); |
| 8555 | |
| 8556 | return dsc; |
| 8557 | } |
| 8558 | |
| 8559 | /* Entry point for cleaning things up after a displaced instruction has been |
| 8560 | single-stepped. */ |
| 8561 | |
| 8562 | void |
| 8563 | arm_displaced_step_fixup (struct gdbarch *gdbarch, |
| 8564 | struct displaced_step_closure *dsc, |
| 8565 | CORE_ADDR from, CORE_ADDR to, |
| 8566 | struct regcache *regs) |
| 8567 | { |
| 8568 | if (dsc->cleanup) |
| 8569 | dsc->cleanup (gdbarch, regs, dsc); |
| 8570 | |
| 8571 | if (!dsc->wrote_to_pc) |
| 8572 | regcache_cooked_write_unsigned (regs, ARM_PC_REGNUM, |
| 8573 | dsc->insn_addr + dsc->insn_size); |
| 8574 | |
| 8575 | } |
| 8576 | |
| 8577 | #include "bfd-in2.h" |
| 8578 | #include "libcoff.h" |
| 8579 | |
| 8580 | static int |
| 8581 | gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info) |
| 8582 | { |
| 8583 | struct gdbarch *gdbarch = info->application_data; |
| 8584 | |
| 8585 | if (arm_pc_is_thumb (gdbarch, memaddr)) |
| 8586 | { |
| 8587 | static asymbol *asym; |
| 8588 | static combined_entry_type ce; |
| 8589 | static struct coff_symbol_struct csym; |
| 8590 | static struct bfd fake_bfd; |
| 8591 | static bfd_target fake_target; |
| 8592 | |
| 8593 | if (csym.native == NULL) |
| 8594 | { |
| 8595 | /* Create a fake symbol vector containing a Thumb symbol. |
| 8596 | This is solely so that the code in print_insn_little_arm() |
| 8597 | and print_insn_big_arm() in opcodes/arm-dis.c will detect |
| 8598 | the presence of a Thumb symbol and switch to decoding |
| 8599 | Thumb instructions. */ |
| 8600 | |
| 8601 | fake_target.flavour = bfd_target_coff_flavour; |
| 8602 | fake_bfd.xvec = &fake_target; |
| 8603 | ce.u.syment.n_sclass = C_THUMBEXTFUNC; |
| 8604 | csym.native = &ce; |
| 8605 | csym.symbol.the_bfd = &fake_bfd; |
| 8606 | csym.symbol.name = "fake"; |
| 8607 | asym = (asymbol *) & csym; |
| 8608 | } |
| 8609 | |
| 8610 | memaddr = UNMAKE_THUMB_ADDR (memaddr); |
| 8611 | info->symbols = &asym; |
| 8612 | } |
| 8613 | else |
| 8614 | info->symbols = NULL; |
| 8615 | |
| 8616 | if (info->endian == BFD_ENDIAN_BIG) |
| 8617 | return print_insn_big_arm (memaddr, info); |
| 8618 | else |
| 8619 | return print_insn_little_arm (memaddr, info); |
| 8620 | } |
| 8621 | |
| 8622 | /* The following define instruction sequences that will cause ARM |
| 8623 | cpu's to take an undefined instruction trap. These are used to |
| 8624 | signal a breakpoint to GDB. |
| 8625 | |
| 8626 | The newer ARMv4T cpu's are capable of operating in ARM or Thumb |
| 8627 | modes. A different instruction is required for each mode. The ARM |
| 8628 | cpu's can also be big or little endian. Thus four different |
| 8629 | instructions are needed to support all cases. |
| 8630 | |
| 8631 | Note: ARMv4 defines several new instructions that will take the |
| 8632 | undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does |
| 8633 | not in fact add the new instructions. The new undefined |
| 8634 | instructions in ARMv4 are all instructions that had no defined |
| 8635 | behaviour in earlier chips. There is no guarantee that they will |
| 8636 | raise an exception, but may be treated as NOP's. In practice, it |
| 8637 | may only safe to rely on instructions matching: |
| 8638 | |
| 8639 | 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 |
| 8640 | 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 |
| 8641 | 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 |
| 8642 | |
| 8643 | Even this may only true if the condition predicate is true. The |
| 8644 | following use a condition predicate of ALWAYS so it is always TRUE. |
| 8645 | |
| 8646 | There are other ways of forcing a breakpoint. GNU/Linux, RISC iX, |
| 8647 | and NetBSD all use a software interrupt rather than an undefined |
| 8648 | instruction to force a trap. This can be handled by by the |
| 8649 | abi-specific code during establishment of the gdbarch vector. */ |
| 8650 | |
| 8651 | #define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7} |
| 8652 | #define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE} |
| 8653 | #define THUMB_LE_BREAKPOINT {0xbe,0xbe} |
| 8654 | #define THUMB_BE_BREAKPOINT {0xbe,0xbe} |
| 8655 | |
| 8656 | static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT; |
| 8657 | static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT; |
| 8658 | static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT; |
| 8659 | static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT; |
| 8660 | |
| 8661 | /* Determine the type and size of breakpoint to insert at PCPTR. Uses |
| 8662 | the program counter value to determine whether a 16-bit or 32-bit |
| 8663 | breakpoint should be used. It returns a pointer to a string of |
| 8664 | bytes that encode a breakpoint instruction, stores the length of |
| 8665 | the string to *lenptr, and adjusts the program counter (if |
| 8666 | necessary) to point to the actual memory location where the |
| 8667 | breakpoint should be inserted. */ |
| 8668 | |
| 8669 | static const unsigned char * |
| 8670 | arm_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) |
| 8671 | { |
| 8672 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 8673 | enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch); |
| 8674 | |
| 8675 | if (arm_pc_is_thumb (gdbarch, *pcptr)) |
| 8676 | { |
| 8677 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); |
| 8678 | |
| 8679 | /* If we have a separate 32-bit breakpoint instruction for Thumb-2, |
| 8680 | check whether we are replacing a 32-bit instruction. */ |
| 8681 | if (tdep->thumb2_breakpoint != NULL) |
| 8682 | { |
| 8683 | gdb_byte buf[2]; |
| 8684 | if (target_read_memory (*pcptr, buf, 2) == 0) |
| 8685 | { |
| 8686 | unsigned short inst1; |
| 8687 | inst1 = extract_unsigned_integer (buf, 2, byte_order_for_code); |
| 8688 | if (thumb_insn_size (inst1) == 4) |
| 8689 | { |
| 8690 | *lenptr = tdep->thumb2_breakpoint_size; |
| 8691 | return tdep->thumb2_breakpoint; |
| 8692 | } |
| 8693 | } |
| 8694 | } |
| 8695 | |
| 8696 | *lenptr = tdep->thumb_breakpoint_size; |
| 8697 | return tdep->thumb_breakpoint; |
| 8698 | } |
| 8699 | else |
| 8700 | { |
| 8701 | *lenptr = tdep->arm_breakpoint_size; |
| 8702 | return tdep->arm_breakpoint; |
| 8703 | } |
| 8704 | } |
| 8705 | |
| 8706 | static void |
| 8707 | arm_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, |
| 8708 | int *kindptr) |
| 8709 | { |
| 8710 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 8711 | |
| 8712 | arm_breakpoint_from_pc (gdbarch, pcptr, kindptr); |
| 8713 | |
| 8714 | if (arm_pc_is_thumb (gdbarch, *pcptr) && *kindptr == 4) |
| 8715 | /* The documented magic value for a 32-bit Thumb-2 breakpoint, so |
| 8716 | that this is not confused with a 32-bit ARM breakpoint. */ |
| 8717 | *kindptr = 3; |
| 8718 | } |
| 8719 | |
| 8720 | /* Extract from an array REGBUF containing the (raw) register state a |
| 8721 | function return value of type TYPE, and copy that, in virtual |
| 8722 | format, into VALBUF. */ |
| 8723 | |
| 8724 | static void |
| 8725 | arm_extract_return_value (struct type *type, struct regcache *regs, |
| 8726 | gdb_byte *valbuf) |
| 8727 | { |
| 8728 | struct gdbarch *gdbarch = get_regcache_arch (regs); |
| 8729 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 8730 | |
| 8731 | if (TYPE_CODE_FLT == TYPE_CODE (type)) |
| 8732 | { |
| 8733 | switch (gdbarch_tdep (gdbarch)->fp_model) |
| 8734 | { |
| 8735 | case ARM_FLOAT_FPA: |
| 8736 | { |
| 8737 | /* The value is in register F0 in internal format. We need to |
| 8738 | extract the raw value and then convert it to the desired |
| 8739 | internal type. */ |
| 8740 | bfd_byte tmpbuf[FP_REGISTER_SIZE]; |
| 8741 | |
| 8742 | regcache_cooked_read (regs, ARM_F0_REGNUM, tmpbuf); |
| 8743 | convert_from_extended (floatformat_from_type (type), tmpbuf, |
| 8744 | valbuf, gdbarch_byte_order (gdbarch)); |
| 8745 | } |
| 8746 | break; |
| 8747 | |
| 8748 | case ARM_FLOAT_SOFT_FPA: |
| 8749 | case ARM_FLOAT_SOFT_VFP: |
| 8750 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
| 8751 | not using the VFP ABI code. */ |
| 8752 | case ARM_FLOAT_VFP: |
| 8753 | regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf); |
| 8754 | if (TYPE_LENGTH (type) > 4) |
| 8755 | regcache_cooked_read (regs, ARM_A1_REGNUM + 1, |
| 8756 | valbuf + INT_REGISTER_SIZE); |
| 8757 | break; |
| 8758 | |
| 8759 | default: |
| 8760 | internal_error (__FILE__, __LINE__, |
| 8761 | _("arm_extract_return_value: " |
| 8762 | "Floating point model not supported")); |
| 8763 | break; |
| 8764 | } |
| 8765 | } |
| 8766 | else if (TYPE_CODE (type) == TYPE_CODE_INT |
| 8767 | || TYPE_CODE (type) == TYPE_CODE_CHAR |
| 8768 | || TYPE_CODE (type) == TYPE_CODE_BOOL |
| 8769 | || TYPE_CODE (type) == TYPE_CODE_PTR |
| 8770 | || TYPE_CODE (type) == TYPE_CODE_REF |
| 8771 | || TYPE_CODE (type) == TYPE_CODE_ENUM) |
| 8772 | { |
| 8773 | /* If the type is a plain integer, then the access is |
| 8774 | straight-forward. Otherwise we have to play around a bit |
| 8775 | more. */ |
| 8776 | int len = TYPE_LENGTH (type); |
| 8777 | int regno = ARM_A1_REGNUM; |
| 8778 | ULONGEST tmp; |
| 8779 | |
| 8780 | while (len > 0) |
| 8781 | { |
| 8782 | /* By using store_unsigned_integer we avoid having to do |
| 8783 | anything special for small big-endian values. */ |
| 8784 | regcache_cooked_read_unsigned (regs, regno++, &tmp); |
| 8785 | store_unsigned_integer (valbuf, |
| 8786 | (len > INT_REGISTER_SIZE |
| 8787 | ? INT_REGISTER_SIZE : len), |
| 8788 | byte_order, tmp); |
| 8789 | len -= INT_REGISTER_SIZE; |
| 8790 | valbuf += INT_REGISTER_SIZE; |
| 8791 | } |
| 8792 | } |
| 8793 | else |
| 8794 | { |
| 8795 | /* For a structure or union the behaviour is as if the value had |
| 8796 | been stored to word-aligned memory and then loaded into |
| 8797 | registers with 32-bit load instruction(s). */ |
| 8798 | int len = TYPE_LENGTH (type); |
| 8799 | int regno = ARM_A1_REGNUM; |
| 8800 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
| 8801 | |
| 8802 | while (len > 0) |
| 8803 | { |
| 8804 | regcache_cooked_read (regs, regno++, tmpbuf); |
| 8805 | memcpy (valbuf, tmpbuf, |
| 8806 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); |
| 8807 | len -= INT_REGISTER_SIZE; |
| 8808 | valbuf += INT_REGISTER_SIZE; |
| 8809 | } |
| 8810 | } |
| 8811 | } |
| 8812 | |
| 8813 | |
| 8814 | /* Will a function return an aggregate type in memory or in a |
| 8815 | register? Return 0 if an aggregate type can be returned in a |
| 8816 | register, 1 if it must be returned in memory. */ |
| 8817 | |
| 8818 | static int |
| 8819 | arm_return_in_memory (struct gdbarch *gdbarch, struct type *type) |
| 8820 | { |
| 8821 | int nRc; |
| 8822 | enum type_code code; |
| 8823 | |
| 8824 | CHECK_TYPEDEF (type); |
| 8825 | |
| 8826 | /* In the ARM ABI, "integer" like aggregate types are returned in |
| 8827 | registers. For an aggregate type to be integer like, its size |
| 8828 | must be less than or equal to INT_REGISTER_SIZE and the |
| 8829 | offset of each addressable subfield must be zero. Note that bit |
| 8830 | fields are not addressable, and all addressable subfields of |
| 8831 | unions always start at offset zero. |
| 8832 | |
| 8833 | This function is based on the behaviour of GCC 2.95.1. |
| 8834 | See: gcc/arm.c: arm_return_in_memory() for details. |
| 8835 | |
| 8836 | Note: All versions of GCC before GCC 2.95.2 do not set up the |
| 8837 | parameters correctly for a function returning the following |
| 8838 | structure: struct { float f;}; This should be returned in memory, |
| 8839 | not a register. Richard Earnshaw sent me a patch, but I do not |
| 8840 | know of any way to detect if a function like the above has been |
| 8841 | compiled with the correct calling convention. */ |
| 8842 | |
| 8843 | /* All aggregate types that won't fit in a register must be returned |
| 8844 | in memory. */ |
| 8845 | if (TYPE_LENGTH (type) > INT_REGISTER_SIZE) |
| 8846 | { |
| 8847 | return 1; |
| 8848 | } |
| 8849 | |
| 8850 | /* The AAPCS says all aggregates not larger than a word are returned |
| 8851 | in a register. */ |
| 8852 | if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS) |
| 8853 | return 0; |
| 8854 | |
| 8855 | /* The only aggregate types that can be returned in a register are |
| 8856 | structs and unions. Arrays must be returned in memory. */ |
| 8857 | code = TYPE_CODE (type); |
| 8858 | if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code)) |
| 8859 | { |
| 8860 | return 1; |
| 8861 | } |
| 8862 | |
| 8863 | /* Assume all other aggregate types can be returned in a register. |
| 8864 | Run a check for structures, unions and arrays. */ |
| 8865 | nRc = 0; |
| 8866 | |
| 8867 | if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code)) |
| 8868 | { |
| 8869 | int i; |
| 8870 | /* Need to check if this struct/union is "integer" like. For |
| 8871 | this to be true, its size must be less than or equal to |
| 8872 | INT_REGISTER_SIZE and the offset of each addressable |
| 8873 | subfield must be zero. Note that bit fields are not |
| 8874 | addressable, and unions always start at offset zero. If any |
| 8875 | of the subfields is a floating point type, the struct/union |
| 8876 | cannot be an integer type. */ |
| 8877 | |
| 8878 | /* For each field in the object, check: |
| 8879 | 1) Is it FP? --> yes, nRc = 1; |
| 8880 | 2) Is it addressable (bitpos != 0) and |
| 8881 | not packed (bitsize == 0)? |
| 8882 | --> yes, nRc = 1 |
| 8883 | */ |
| 8884 | |
| 8885 | for (i = 0; i < TYPE_NFIELDS (type); i++) |
| 8886 | { |
| 8887 | enum type_code field_type_code; |
| 8888 | field_type_code = TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, |
| 8889 | i))); |
| 8890 | |
| 8891 | /* Is it a floating point type field? */ |
| 8892 | if (field_type_code == TYPE_CODE_FLT) |
| 8893 | { |
| 8894 | nRc = 1; |
| 8895 | break; |
| 8896 | } |
| 8897 | |
| 8898 | /* If bitpos != 0, then we have to care about it. */ |
| 8899 | if (TYPE_FIELD_BITPOS (type, i) != 0) |
| 8900 | { |
| 8901 | /* Bitfields are not addressable. If the field bitsize is |
| 8902 | zero, then the field is not packed. Hence it cannot be |
| 8903 | a bitfield or any other packed type. */ |
| 8904 | if (TYPE_FIELD_BITSIZE (type, i) == 0) |
| 8905 | { |
| 8906 | nRc = 1; |
| 8907 | break; |
| 8908 | } |
| 8909 | } |
| 8910 | } |
| 8911 | } |
| 8912 | |
| 8913 | return nRc; |
| 8914 | } |
| 8915 | |
| 8916 | /* Write into appropriate registers a function return value of type |
| 8917 | TYPE, given in virtual format. */ |
| 8918 | |
| 8919 | static void |
| 8920 | arm_store_return_value (struct type *type, struct regcache *regs, |
| 8921 | const gdb_byte *valbuf) |
| 8922 | { |
| 8923 | struct gdbarch *gdbarch = get_regcache_arch (regs); |
| 8924 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 8925 | |
| 8926 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| 8927 | { |
| 8928 | char buf[MAX_REGISTER_SIZE]; |
| 8929 | |
| 8930 | switch (gdbarch_tdep (gdbarch)->fp_model) |
| 8931 | { |
| 8932 | case ARM_FLOAT_FPA: |
| 8933 | |
| 8934 | convert_to_extended (floatformat_from_type (type), buf, valbuf, |
| 8935 | gdbarch_byte_order (gdbarch)); |
| 8936 | regcache_cooked_write (regs, ARM_F0_REGNUM, buf); |
| 8937 | break; |
| 8938 | |
| 8939 | case ARM_FLOAT_SOFT_FPA: |
| 8940 | case ARM_FLOAT_SOFT_VFP: |
| 8941 | /* ARM_FLOAT_VFP can arise if this is a variadic function so |
| 8942 | not using the VFP ABI code. */ |
| 8943 | case ARM_FLOAT_VFP: |
| 8944 | regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf); |
| 8945 | if (TYPE_LENGTH (type) > 4) |
| 8946 | regcache_cooked_write (regs, ARM_A1_REGNUM + 1, |
| 8947 | valbuf + INT_REGISTER_SIZE); |
| 8948 | break; |
| 8949 | |
| 8950 | default: |
| 8951 | internal_error (__FILE__, __LINE__, |
| 8952 | _("arm_store_return_value: Floating " |
| 8953 | "point model not supported")); |
| 8954 | break; |
| 8955 | } |
| 8956 | } |
| 8957 | else if (TYPE_CODE (type) == TYPE_CODE_INT |
| 8958 | || TYPE_CODE (type) == TYPE_CODE_CHAR |
| 8959 | || TYPE_CODE (type) == TYPE_CODE_BOOL |
| 8960 | || TYPE_CODE (type) == TYPE_CODE_PTR |
| 8961 | || TYPE_CODE (type) == TYPE_CODE_REF |
| 8962 | || TYPE_CODE (type) == TYPE_CODE_ENUM) |
| 8963 | { |
| 8964 | if (TYPE_LENGTH (type) <= 4) |
| 8965 | { |
| 8966 | /* Values of one word or less are zero/sign-extended and |
| 8967 | returned in r0. */ |
| 8968 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
| 8969 | LONGEST val = unpack_long (type, valbuf); |
| 8970 | |
| 8971 | store_signed_integer (tmpbuf, INT_REGISTER_SIZE, byte_order, val); |
| 8972 | regcache_cooked_write (regs, ARM_A1_REGNUM, tmpbuf); |
| 8973 | } |
| 8974 | else |
| 8975 | { |
| 8976 | /* Integral values greater than one word are stored in consecutive |
| 8977 | registers starting with r0. This will always be a multiple of |
| 8978 | the regiser size. */ |
| 8979 | int len = TYPE_LENGTH (type); |
| 8980 | int regno = ARM_A1_REGNUM; |
| 8981 | |
| 8982 | while (len > 0) |
| 8983 | { |
| 8984 | regcache_cooked_write (regs, regno++, valbuf); |
| 8985 | len -= INT_REGISTER_SIZE; |
| 8986 | valbuf += INT_REGISTER_SIZE; |
| 8987 | } |
| 8988 | } |
| 8989 | } |
| 8990 | else |
| 8991 | { |
| 8992 | /* For a structure or union the behaviour is as if the value had |
| 8993 | been stored to word-aligned memory and then loaded into |
| 8994 | registers with 32-bit load instruction(s). */ |
| 8995 | int len = TYPE_LENGTH (type); |
| 8996 | int regno = ARM_A1_REGNUM; |
| 8997 | bfd_byte tmpbuf[INT_REGISTER_SIZE]; |
| 8998 | |
| 8999 | while (len > 0) |
| 9000 | { |
| 9001 | memcpy (tmpbuf, valbuf, |
| 9002 | len > INT_REGISTER_SIZE ? INT_REGISTER_SIZE : len); |
| 9003 | regcache_cooked_write (regs, regno++, tmpbuf); |
| 9004 | len -= INT_REGISTER_SIZE; |
| 9005 | valbuf += INT_REGISTER_SIZE; |
| 9006 | } |
| 9007 | } |
| 9008 | } |
| 9009 | |
| 9010 | |
| 9011 | /* Handle function return values. */ |
| 9012 | |
| 9013 | static enum return_value_convention |
| 9014 | arm_return_value (struct gdbarch *gdbarch, struct type *func_type, |
| 9015 | struct type *valtype, struct regcache *regcache, |
| 9016 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 9017 | { |
| 9018 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 9019 | enum arm_vfp_cprc_base_type vfp_base_type; |
| 9020 | int vfp_base_count; |
| 9021 | |
| 9022 | if (arm_vfp_abi_for_function (gdbarch, func_type) |
| 9023 | && arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count)) |
| 9024 | { |
| 9025 | int reg_char = arm_vfp_cprc_reg_char (vfp_base_type); |
| 9026 | int unit_length = arm_vfp_cprc_unit_length (vfp_base_type); |
| 9027 | int i; |
| 9028 | for (i = 0; i < vfp_base_count; i++) |
| 9029 | { |
| 9030 | if (reg_char == 'q') |
| 9031 | { |
| 9032 | if (writebuf) |
| 9033 | arm_neon_quad_write (gdbarch, regcache, i, |
| 9034 | writebuf + i * unit_length); |
| 9035 | |
| 9036 | if (readbuf) |
| 9037 | arm_neon_quad_read (gdbarch, regcache, i, |
| 9038 | readbuf + i * unit_length); |
| 9039 | } |
| 9040 | else |
| 9041 | { |
| 9042 | char name_buf[4]; |
| 9043 | int regnum; |
| 9044 | |
| 9045 | sprintf (name_buf, "%c%d", reg_char, i); |
| 9046 | regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 9047 | strlen (name_buf)); |
| 9048 | if (writebuf) |
| 9049 | regcache_cooked_write (regcache, regnum, |
| 9050 | writebuf + i * unit_length); |
| 9051 | if (readbuf) |
| 9052 | regcache_cooked_read (regcache, regnum, |
| 9053 | readbuf + i * unit_length); |
| 9054 | } |
| 9055 | } |
| 9056 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 9057 | } |
| 9058 | |
| 9059 | if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 9060 | || TYPE_CODE (valtype) == TYPE_CODE_UNION |
| 9061 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) |
| 9062 | { |
| 9063 | if (tdep->struct_return == pcc_struct_return |
| 9064 | || arm_return_in_memory (gdbarch, valtype)) |
| 9065 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 9066 | } |
| 9067 | |
| 9068 | /* AAPCS returns complex types longer than a register in memory. */ |
| 9069 | if (tdep->arm_abi != ARM_ABI_APCS |
| 9070 | && TYPE_CODE (valtype) == TYPE_CODE_COMPLEX |
| 9071 | && TYPE_LENGTH (valtype) > INT_REGISTER_SIZE) |
| 9072 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 9073 | |
| 9074 | if (writebuf) |
| 9075 | arm_store_return_value (valtype, regcache, writebuf); |
| 9076 | |
| 9077 | if (readbuf) |
| 9078 | arm_extract_return_value (valtype, regcache, readbuf); |
| 9079 | |
| 9080 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 9081 | } |
| 9082 | |
| 9083 | |
| 9084 | static int |
| 9085 | arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 9086 | { |
| 9087 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 9088 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 9089 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 9090 | CORE_ADDR jb_addr; |
| 9091 | char buf[INT_REGISTER_SIZE]; |
| 9092 | |
| 9093 | jb_addr = get_frame_register_unsigned (frame, ARM_A1_REGNUM); |
| 9094 | |
| 9095 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
| 9096 | INT_REGISTER_SIZE)) |
| 9097 | return 0; |
| 9098 | |
| 9099 | *pc = extract_unsigned_integer (buf, INT_REGISTER_SIZE, byte_order); |
| 9100 | return 1; |
| 9101 | } |
| 9102 | |
| 9103 | /* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, |
| 9104 | return the target PC. Otherwise return 0. */ |
| 9105 | |
| 9106 | CORE_ADDR |
| 9107 | arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) |
| 9108 | { |
| 9109 | const char *name; |
| 9110 | int namelen; |
| 9111 | CORE_ADDR start_addr; |
| 9112 | |
| 9113 | /* Find the starting address and name of the function containing the PC. */ |
| 9114 | if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) |
| 9115 | return 0; |
| 9116 | |
| 9117 | /* If PC is in a Thumb call or return stub, return the address of the |
| 9118 | target PC, which is in a register. The thunk functions are called |
| 9119 | _call_via_xx, where x is the register name. The possible names |
| 9120 | are r0-r9, sl, fp, ip, sp, and lr. ARM RealView has similar |
| 9121 | functions, named __ARM_call_via_r[0-7]. */ |
| 9122 | if (strncmp (name, "_call_via_", 10) == 0 |
| 9123 | || strncmp (name, "__ARM_call_via_", strlen ("__ARM_call_via_")) == 0) |
| 9124 | { |
| 9125 | /* Use the name suffix to determine which register contains the |
| 9126 | target PC. */ |
| 9127 | static char *table[15] = |
| 9128 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 9129 | "r8", "r9", "sl", "fp", "ip", "sp", "lr" |
| 9130 | }; |
| 9131 | int regno; |
| 9132 | int offset = strlen (name) - 2; |
| 9133 | |
| 9134 | for (regno = 0; regno <= 14; regno++) |
| 9135 | if (strcmp (&name[offset], table[regno]) == 0) |
| 9136 | return get_frame_register_unsigned (frame, regno); |
| 9137 | } |
| 9138 | |
| 9139 | /* GNU ld generates __foo_from_arm or __foo_from_thumb for |
| 9140 | non-interworking calls to foo. We could decode the stubs |
| 9141 | to find the target but it's easier to use the symbol table. */ |
| 9142 | namelen = strlen (name); |
| 9143 | if (name[0] == '_' && name[1] == '_' |
| 9144 | && ((namelen > 2 + strlen ("_from_thumb") |
| 9145 | && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb", |
| 9146 | strlen ("_from_thumb")) == 0) |
| 9147 | || (namelen > 2 + strlen ("_from_arm") |
| 9148 | && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm", |
| 9149 | strlen ("_from_arm")) == 0))) |
| 9150 | { |
| 9151 | char *target_name; |
| 9152 | int target_len = namelen - 2; |
| 9153 | struct minimal_symbol *minsym; |
| 9154 | struct objfile *objfile; |
| 9155 | struct obj_section *sec; |
| 9156 | |
| 9157 | if (name[namelen - 1] == 'b') |
| 9158 | target_len -= strlen ("_from_thumb"); |
| 9159 | else |
| 9160 | target_len -= strlen ("_from_arm"); |
| 9161 | |
| 9162 | target_name = alloca (target_len + 1); |
| 9163 | memcpy (target_name, name + 2, target_len); |
| 9164 | target_name[target_len] = '\0'; |
| 9165 | |
| 9166 | sec = find_pc_section (pc); |
| 9167 | objfile = (sec == NULL) ? NULL : sec->objfile; |
| 9168 | minsym = lookup_minimal_symbol (target_name, NULL, objfile); |
| 9169 | if (minsym != NULL) |
| 9170 | return SYMBOL_VALUE_ADDRESS (minsym); |
| 9171 | else |
| 9172 | return 0; |
| 9173 | } |
| 9174 | |
| 9175 | return 0; /* not a stub */ |
| 9176 | } |
| 9177 | |
| 9178 | static void |
| 9179 | set_arm_command (char *args, int from_tty) |
| 9180 | { |
| 9181 | printf_unfiltered (_("\ |
| 9182 | \"set arm\" must be followed by an apporpriate subcommand.\n")); |
| 9183 | help_list (setarmcmdlist, "set arm ", all_commands, gdb_stdout); |
| 9184 | } |
| 9185 | |
| 9186 | static void |
| 9187 | show_arm_command (char *args, int from_tty) |
| 9188 | { |
| 9189 | cmd_show_list (showarmcmdlist, from_tty, ""); |
| 9190 | } |
| 9191 | |
| 9192 | static void |
| 9193 | arm_update_current_architecture (void) |
| 9194 | { |
| 9195 | struct gdbarch_info info; |
| 9196 | |
| 9197 | /* If the current architecture is not ARM, we have nothing to do. */ |
| 9198 | if (gdbarch_bfd_arch_info (target_gdbarch)->arch != bfd_arch_arm) |
| 9199 | return; |
| 9200 | |
| 9201 | /* Update the architecture. */ |
| 9202 | gdbarch_info_init (&info); |
| 9203 | |
| 9204 | if (!gdbarch_update_p (info)) |
| 9205 | internal_error (__FILE__, __LINE__, _("could not update architecture")); |
| 9206 | } |
| 9207 | |
| 9208 | static void |
| 9209 | set_fp_model_sfunc (char *args, int from_tty, |
| 9210 | struct cmd_list_element *c) |
| 9211 | { |
| 9212 | enum arm_float_model fp_model; |
| 9213 | |
| 9214 | for (fp_model = ARM_FLOAT_AUTO; fp_model != ARM_FLOAT_LAST; fp_model++) |
| 9215 | if (strcmp (current_fp_model, fp_model_strings[fp_model]) == 0) |
| 9216 | { |
| 9217 | arm_fp_model = fp_model; |
| 9218 | break; |
| 9219 | } |
| 9220 | |
| 9221 | if (fp_model == ARM_FLOAT_LAST) |
| 9222 | internal_error (__FILE__, __LINE__, _("Invalid fp model accepted: %s."), |
| 9223 | current_fp_model); |
| 9224 | |
| 9225 | arm_update_current_architecture (); |
| 9226 | } |
| 9227 | |
| 9228 | static void |
| 9229 | show_fp_model (struct ui_file *file, int from_tty, |
| 9230 | struct cmd_list_element *c, const char *value) |
| 9231 | { |
| 9232 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
| 9233 | |
| 9234 | if (arm_fp_model == ARM_FLOAT_AUTO |
| 9235 | && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm) |
| 9236 | fprintf_filtered (file, _("\ |
| 9237 | The current ARM floating point model is \"auto\" (currently \"%s\").\n"), |
| 9238 | fp_model_strings[tdep->fp_model]); |
| 9239 | else |
| 9240 | fprintf_filtered (file, _("\ |
| 9241 | The current ARM floating point model is \"%s\".\n"), |
| 9242 | fp_model_strings[arm_fp_model]); |
| 9243 | } |
| 9244 | |
| 9245 | static void |
| 9246 | arm_set_abi (char *args, int from_tty, |
| 9247 | struct cmd_list_element *c) |
| 9248 | { |
| 9249 | enum arm_abi_kind arm_abi; |
| 9250 | |
| 9251 | for (arm_abi = ARM_ABI_AUTO; arm_abi != ARM_ABI_LAST; arm_abi++) |
| 9252 | if (strcmp (arm_abi_string, arm_abi_strings[arm_abi]) == 0) |
| 9253 | { |
| 9254 | arm_abi_global = arm_abi; |
| 9255 | break; |
| 9256 | } |
| 9257 | |
| 9258 | if (arm_abi == ARM_ABI_LAST) |
| 9259 | internal_error (__FILE__, __LINE__, _("Invalid ABI accepted: %s."), |
| 9260 | arm_abi_string); |
| 9261 | |
| 9262 | arm_update_current_architecture (); |
| 9263 | } |
| 9264 | |
| 9265 | static void |
| 9266 | arm_show_abi (struct ui_file *file, int from_tty, |
| 9267 | struct cmd_list_element *c, const char *value) |
| 9268 | { |
| 9269 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
| 9270 | |
| 9271 | if (arm_abi_global == ARM_ABI_AUTO |
| 9272 | && gdbarch_bfd_arch_info (target_gdbarch)->arch == bfd_arch_arm) |
| 9273 | fprintf_filtered (file, _("\ |
| 9274 | The current ARM ABI is \"auto\" (currently \"%s\").\n"), |
| 9275 | arm_abi_strings[tdep->arm_abi]); |
| 9276 | else |
| 9277 | fprintf_filtered (file, _("The current ARM ABI is \"%s\".\n"), |
| 9278 | arm_abi_string); |
| 9279 | } |
| 9280 | |
| 9281 | static void |
| 9282 | arm_show_fallback_mode (struct ui_file *file, int from_tty, |
| 9283 | struct cmd_list_element *c, const char *value) |
| 9284 | { |
| 9285 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
| 9286 | |
| 9287 | fprintf_filtered (file, |
| 9288 | _("The current execution mode assumed " |
| 9289 | "(when symbols are unavailable) is \"%s\".\n"), |
| 9290 | arm_fallback_mode_string); |
| 9291 | } |
| 9292 | |
| 9293 | static void |
| 9294 | arm_show_force_mode (struct ui_file *file, int from_tty, |
| 9295 | struct cmd_list_element *c, const char *value) |
| 9296 | { |
| 9297 | struct gdbarch_tdep *tdep = gdbarch_tdep (target_gdbarch); |
| 9298 | |
| 9299 | fprintf_filtered (file, |
| 9300 | _("The current execution mode assumed " |
| 9301 | "(even when symbols are available) is \"%s\".\n"), |
| 9302 | arm_force_mode_string); |
| 9303 | } |
| 9304 | |
| 9305 | /* If the user changes the register disassembly style used for info |
| 9306 | register and other commands, we have to also switch the style used |
| 9307 | in opcodes for disassembly output. This function is run in the "set |
| 9308 | arm disassembly" command, and does that. */ |
| 9309 | |
| 9310 | static void |
| 9311 | set_disassembly_style_sfunc (char *args, int from_tty, |
| 9312 | struct cmd_list_element *c) |
| 9313 | { |
| 9314 | set_disassembly_style (); |
| 9315 | } |
| 9316 | \f |
| 9317 | /* Return the ARM register name corresponding to register I. */ |
| 9318 | static const char * |
| 9319 | arm_register_name (struct gdbarch *gdbarch, int i) |
| 9320 | { |
| 9321 | const int num_regs = gdbarch_num_regs (gdbarch); |
| 9322 | |
| 9323 | if (gdbarch_tdep (gdbarch)->have_vfp_pseudos |
| 9324 | && i >= num_regs && i < num_regs + 32) |
| 9325 | { |
| 9326 | static const char *const vfp_pseudo_names[] = { |
| 9327 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", |
| 9328 | "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15", |
| 9329 | "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23", |
| 9330 | "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31", |
| 9331 | }; |
| 9332 | |
| 9333 | return vfp_pseudo_names[i - num_regs]; |
| 9334 | } |
| 9335 | |
| 9336 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos |
| 9337 | && i >= num_regs + 32 && i < num_regs + 32 + 16) |
| 9338 | { |
| 9339 | static const char *const neon_pseudo_names[] = { |
| 9340 | "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", |
| 9341 | "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15", |
| 9342 | }; |
| 9343 | |
| 9344 | return neon_pseudo_names[i - num_regs - 32]; |
| 9345 | } |
| 9346 | |
| 9347 | if (i >= ARRAY_SIZE (arm_register_names)) |
| 9348 | /* These registers are only supported on targets which supply |
| 9349 | an XML description. */ |
| 9350 | return ""; |
| 9351 | |
| 9352 | return arm_register_names[i]; |
| 9353 | } |
| 9354 | |
| 9355 | static void |
| 9356 | set_disassembly_style (void) |
| 9357 | { |
| 9358 | int current; |
| 9359 | |
| 9360 | /* Find the style that the user wants. */ |
| 9361 | for (current = 0; current < num_disassembly_options; current++) |
| 9362 | if (disassembly_style == valid_disassembly_styles[current]) |
| 9363 | break; |
| 9364 | gdb_assert (current < num_disassembly_options); |
| 9365 | |
| 9366 | /* Synchronize the disassembler. */ |
| 9367 | set_arm_regname_option (current); |
| 9368 | } |
| 9369 | |
| 9370 | /* Test whether the coff symbol specific value corresponds to a Thumb |
| 9371 | function. */ |
| 9372 | |
| 9373 | static int |
| 9374 | coff_sym_is_thumb (int val) |
| 9375 | { |
| 9376 | return (val == C_THUMBEXT |
| 9377 | || val == C_THUMBSTAT |
| 9378 | || val == C_THUMBEXTFUNC |
| 9379 | || val == C_THUMBSTATFUNC |
| 9380 | || val == C_THUMBLABEL); |
| 9381 | } |
| 9382 | |
| 9383 | /* arm_coff_make_msymbol_special() |
| 9384 | arm_elf_make_msymbol_special() |
| 9385 | |
| 9386 | These functions test whether the COFF or ELF symbol corresponds to |
| 9387 | an address in thumb code, and set a "special" bit in a minimal |
| 9388 | symbol to indicate that it does. */ |
| 9389 | |
| 9390 | static void |
| 9391 | arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym) |
| 9392 | { |
| 9393 | if (ARM_SYM_BRANCH_TYPE (&((elf_symbol_type *)sym)->internal_elf_sym) |
| 9394 | == ST_BRANCH_TO_THUMB) |
| 9395 | MSYMBOL_SET_SPECIAL (msym); |
| 9396 | } |
| 9397 | |
| 9398 | static void |
| 9399 | arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym) |
| 9400 | { |
| 9401 | if (coff_sym_is_thumb (val)) |
| 9402 | MSYMBOL_SET_SPECIAL (msym); |
| 9403 | } |
| 9404 | |
| 9405 | static void |
| 9406 | arm_objfile_data_free (struct objfile *objfile, void *arg) |
| 9407 | { |
| 9408 | struct arm_per_objfile *data = arg; |
| 9409 | unsigned int i; |
| 9410 | |
| 9411 | for (i = 0; i < objfile->obfd->section_count; i++) |
| 9412 | VEC_free (arm_mapping_symbol_s, data->section_maps[i]); |
| 9413 | } |
| 9414 | |
| 9415 | static void |
| 9416 | arm_record_special_symbol (struct gdbarch *gdbarch, struct objfile *objfile, |
| 9417 | asymbol *sym) |
| 9418 | { |
| 9419 | const char *name = bfd_asymbol_name (sym); |
| 9420 | struct arm_per_objfile *data; |
| 9421 | VEC(arm_mapping_symbol_s) **map_p; |
| 9422 | struct arm_mapping_symbol new_map_sym; |
| 9423 | |
| 9424 | gdb_assert (name[0] == '$'); |
| 9425 | if (name[1] != 'a' && name[1] != 't' && name[1] != 'd') |
| 9426 | return; |
| 9427 | |
| 9428 | data = objfile_data (objfile, arm_objfile_data_key); |
| 9429 | if (data == NULL) |
| 9430 | { |
| 9431 | data = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| 9432 | struct arm_per_objfile); |
| 9433 | set_objfile_data (objfile, arm_objfile_data_key, data); |
| 9434 | data->section_maps = OBSTACK_CALLOC (&objfile->objfile_obstack, |
| 9435 | objfile->obfd->section_count, |
| 9436 | VEC(arm_mapping_symbol_s) *); |
| 9437 | } |
| 9438 | map_p = &data->section_maps[bfd_get_section (sym)->index]; |
| 9439 | |
| 9440 | new_map_sym.value = sym->value; |
| 9441 | new_map_sym.type = name[1]; |
| 9442 | |
| 9443 | /* Assume that most mapping symbols appear in order of increasing |
| 9444 | value. If they were randomly distributed, it would be faster to |
| 9445 | always push here and then sort at first use. */ |
| 9446 | if (!VEC_empty (arm_mapping_symbol_s, *map_p)) |
| 9447 | { |
| 9448 | struct arm_mapping_symbol *prev_map_sym; |
| 9449 | |
| 9450 | prev_map_sym = VEC_last (arm_mapping_symbol_s, *map_p); |
| 9451 | if (prev_map_sym->value >= sym->value) |
| 9452 | { |
| 9453 | unsigned int idx; |
| 9454 | idx = VEC_lower_bound (arm_mapping_symbol_s, *map_p, &new_map_sym, |
| 9455 | arm_compare_mapping_symbols); |
| 9456 | VEC_safe_insert (arm_mapping_symbol_s, *map_p, idx, &new_map_sym); |
| 9457 | return; |
| 9458 | } |
| 9459 | } |
| 9460 | |
| 9461 | VEC_safe_push (arm_mapping_symbol_s, *map_p, &new_map_sym); |
| 9462 | } |
| 9463 | |
| 9464 | static void |
| 9465 | arm_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 9466 | { |
| 9467 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 9468 | regcache_cooked_write_unsigned (regcache, ARM_PC_REGNUM, pc); |
| 9469 | |
| 9470 | /* If necessary, set the T bit. */ |
| 9471 | if (arm_apcs_32) |
| 9472 | { |
| 9473 | ULONGEST val, t_bit; |
| 9474 | regcache_cooked_read_unsigned (regcache, ARM_PS_REGNUM, &val); |
| 9475 | t_bit = arm_psr_thumb_bit (gdbarch); |
| 9476 | if (arm_pc_is_thumb (gdbarch, pc)) |
| 9477 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
| 9478 | val | t_bit); |
| 9479 | else |
| 9480 | regcache_cooked_write_unsigned (regcache, ARM_PS_REGNUM, |
| 9481 | val & ~t_bit); |
| 9482 | } |
| 9483 | } |
| 9484 | |
| 9485 | /* Read the contents of a NEON quad register, by reading from two |
| 9486 | double registers. This is used to implement the quad pseudo |
| 9487 | registers, and for argument passing in case the quad registers are |
| 9488 | missing; vectors are passed in quad registers when using the VFP |
| 9489 | ABI, even if a NEON unit is not present. REGNUM is the index of |
| 9490 | the quad register, in [0, 15]. */ |
| 9491 | |
| 9492 | static enum register_status |
| 9493 | arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 9494 | int regnum, gdb_byte *buf) |
| 9495 | { |
| 9496 | char name_buf[4]; |
| 9497 | gdb_byte reg_buf[8]; |
| 9498 | int offset, double_regnum; |
| 9499 | enum register_status status; |
| 9500 | |
| 9501 | sprintf (name_buf, "d%d", regnum << 1); |
| 9502 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 9503 | strlen (name_buf)); |
| 9504 | |
| 9505 | /* d0 is always the least significant half of q0. */ |
| 9506 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 9507 | offset = 8; |
| 9508 | else |
| 9509 | offset = 0; |
| 9510 | |
| 9511 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
| 9512 | if (status != REG_VALID) |
| 9513 | return status; |
| 9514 | memcpy (buf + offset, reg_buf, 8); |
| 9515 | |
| 9516 | offset = 8 - offset; |
| 9517 | status = regcache_raw_read (regcache, double_regnum + 1, reg_buf); |
| 9518 | if (status != REG_VALID) |
| 9519 | return status; |
| 9520 | memcpy (buf + offset, reg_buf, 8); |
| 9521 | |
| 9522 | return REG_VALID; |
| 9523 | } |
| 9524 | |
| 9525 | static enum register_status |
| 9526 | arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache, |
| 9527 | int regnum, gdb_byte *buf) |
| 9528 | { |
| 9529 | const int num_regs = gdbarch_num_regs (gdbarch); |
| 9530 | char name_buf[4]; |
| 9531 | gdb_byte reg_buf[8]; |
| 9532 | int offset, double_regnum; |
| 9533 | |
| 9534 | gdb_assert (regnum >= num_regs); |
| 9535 | regnum -= num_regs; |
| 9536 | |
| 9537 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) |
| 9538 | /* Quad-precision register. */ |
| 9539 | return arm_neon_quad_read (gdbarch, regcache, regnum - 32, buf); |
| 9540 | else |
| 9541 | { |
| 9542 | enum register_status status; |
| 9543 | |
| 9544 | /* Single-precision register. */ |
| 9545 | gdb_assert (regnum < 32); |
| 9546 | |
| 9547 | /* s0 is always the least significant half of d0. */ |
| 9548 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 9549 | offset = (regnum & 1) ? 0 : 4; |
| 9550 | else |
| 9551 | offset = (regnum & 1) ? 4 : 0; |
| 9552 | |
| 9553 | sprintf (name_buf, "d%d", regnum >> 1); |
| 9554 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 9555 | strlen (name_buf)); |
| 9556 | |
| 9557 | status = regcache_raw_read (regcache, double_regnum, reg_buf); |
| 9558 | if (status == REG_VALID) |
| 9559 | memcpy (buf, reg_buf + offset, 4); |
| 9560 | return status; |
| 9561 | } |
| 9562 | } |
| 9563 | |
| 9564 | /* Store the contents of BUF to a NEON quad register, by writing to |
| 9565 | two double registers. This is used to implement the quad pseudo |
| 9566 | registers, and for argument passing in case the quad registers are |
| 9567 | missing; vectors are passed in quad registers when using the VFP |
| 9568 | ABI, even if a NEON unit is not present. REGNUM is the index |
| 9569 | of the quad register, in [0, 15]. */ |
| 9570 | |
| 9571 | static void |
| 9572 | arm_neon_quad_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 9573 | int regnum, const gdb_byte *buf) |
| 9574 | { |
| 9575 | char name_buf[4]; |
| 9576 | gdb_byte reg_buf[8]; |
| 9577 | int offset, double_regnum; |
| 9578 | |
| 9579 | sprintf (name_buf, "d%d", regnum << 1); |
| 9580 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 9581 | strlen (name_buf)); |
| 9582 | |
| 9583 | /* d0 is always the least significant half of q0. */ |
| 9584 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 9585 | offset = 8; |
| 9586 | else |
| 9587 | offset = 0; |
| 9588 | |
| 9589 | regcache_raw_write (regcache, double_regnum, buf + offset); |
| 9590 | offset = 8 - offset; |
| 9591 | regcache_raw_write (regcache, double_regnum + 1, buf + offset); |
| 9592 | } |
| 9593 | |
| 9594 | static void |
| 9595 | arm_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache, |
| 9596 | int regnum, const gdb_byte *buf) |
| 9597 | { |
| 9598 | const int num_regs = gdbarch_num_regs (gdbarch); |
| 9599 | char name_buf[4]; |
| 9600 | gdb_byte reg_buf[8]; |
| 9601 | int offset, double_regnum; |
| 9602 | |
| 9603 | gdb_assert (regnum >= num_regs); |
| 9604 | regnum -= num_regs; |
| 9605 | |
| 9606 | if (gdbarch_tdep (gdbarch)->have_neon_pseudos && regnum >= 32 && regnum < 48) |
| 9607 | /* Quad-precision register. */ |
| 9608 | arm_neon_quad_write (gdbarch, regcache, regnum - 32, buf); |
| 9609 | else |
| 9610 | { |
| 9611 | /* Single-precision register. */ |
| 9612 | gdb_assert (regnum < 32); |
| 9613 | |
| 9614 | /* s0 is always the least significant half of d0. */ |
| 9615 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 9616 | offset = (regnum & 1) ? 0 : 4; |
| 9617 | else |
| 9618 | offset = (regnum & 1) ? 4 : 0; |
| 9619 | |
| 9620 | sprintf (name_buf, "d%d", regnum >> 1); |
| 9621 | double_regnum = user_reg_map_name_to_regnum (gdbarch, name_buf, |
| 9622 | strlen (name_buf)); |
| 9623 | |
| 9624 | regcache_raw_read (regcache, double_regnum, reg_buf); |
| 9625 | memcpy (reg_buf + offset, buf, 4); |
| 9626 | regcache_raw_write (regcache, double_regnum, reg_buf); |
| 9627 | } |
| 9628 | } |
| 9629 | |
| 9630 | static struct value * |
| 9631 | value_of_arm_user_reg (struct frame_info *frame, const void *baton) |
| 9632 | { |
| 9633 | const int *reg_p = baton; |
| 9634 | return value_of_register (*reg_p, frame); |
| 9635 | } |
| 9636 | \f |
| 9637 | static enum gdb_osabi |
| 9638 | arm_elf_osabi_sniffer (bfd *abfd) |
| 9639 | { |
| 9640 | unsigned int elfosabi; |
| 9641 | enum gdb_osabi osabi = GDB_OSABI_UNKNOWN; |
| 9642 | |
| 9643 | elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI]; |
| 9644 | |
| 9645 | if (elfosabi == ELFOSABI_ARM) |
| 9646 | /* GNU tools use this value. Check note sections in this case, |
| 9647 | as well. */ |
| 9648 | bfd_map_over_sections (abfd, |
| 9649 | generic_elf_osabi_sniff_abi_tag_sections, |
| 9650 | &osabi); |
| 9651 | |
| 9652 | /* Anything else will be handled by the generic ELF sniffer. */ |
| 9653 | return osabi; |
| 9654 | } |
| 9655 | |
| 9656 | static int |
| 9657 | arm_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
| 9658 | struct reggroup *group) |
| 9659 | { |
| 9660 | /* FPS register's type is INT, but belongs to float_reggroup. Beside |
| 9661 | this, FPS register belongs to save_regroup, restore_reggroup, and |
| 9662 | all_reggroup, of course. */ |
| 9663 | if (regnum == ARM_FPS_REGNUM) |
| 9664 | return (group == float_reggroup |
| 9665 | || group == save_reggroup |
| 9666 | || group == restore_reggroup |
| 9667 | || group == all_reggroup); |
| 9668 | else |
| 9669 | return default_register_reggroup_p (gdbarch, regnum, group); |
| 9670 | } |
| 9671 | |
| 9672 | \f |
| 9673 | /* For backward-compatibility we allow two 'g' packet lengths with |
| 9674 | the remote protocol depending on whether FPA registers are |
| 9675 | supplied. M-profile targets do not have FPA registers, but some |
| 9676 | stubs already exist in the wild which use a 'g' packet which |
| 9677 | supplies them albeit with dummy values. The packet format which |
| 9678 | includes FPA registers should be considered deprecated for |
| 9679 | M-profile targets. */ |
| 9680 | |
| 9681 | static void |
| 9682 | arm_register_g_packet_guesses (struct gdbarch *gdbarch) |
| 9683 | { |
| 9684 | if (gdbarch_tdep (gdbarch)->is_m) |
| 9685 | { |
| 9686 | /* If we know from the executable this is an M-profile target, |
| 9687 | cater for remote targets whose register set layout is the |
| 9688 | same as the FPA layout. */ |
| 9689 | register_remote_g_packet_guess (gdbarch, |
| 9690 | /* r0-r12,sp,lr,pc; f0-f7; fps,xpsr */ |
| 9691 | (16 * INT_REGISTER_SIZE) |
| 9692 | + (8 * FP_REGISTER_SIZE) |
| 9693 | + (2 * INT_REGISTER_SIZE), |
| 9694 | tdesc_arm_with_m_fpa_layout); |
| 9695 | |
| 9696 | /* The regular M-profile layout. */ |
| 9697 | register_remote_g_packet_guess (gdbarch, |
| 9698 | /* r0-r12,sp,lr,pc; xpsr */ |
| 9699 | (16 * INT_REGISTER_SIZE) |
| 9700 | + INT_REGISTER_SIZE, |
| 9701 | tdesc_arm_with_m); |
| 9702 | |
| 9703 | /* M-profile plus M4F VFP. */ |
| 9704 | register_remote_g_packet_guess (gdbarch, |
| 9705 | /* r0-r12,sp,lr,pc; d0-d15; fpscr,xpsr */ |
| 9706 | (16 * INT_REGISTER_SIZE) |
| 9707 | + (16 * VFP_REGISTER_SIZE) |
| 9708 | + (2 * INT_REGISTER_SIZE), |
| 9709 | tdesc_arm_with_m_vfp_d16); |
| 9710 | } |
| 9711 | |
| 9712 | /* Otherwise we don't have a useful guess. */ |
| 9713 | } |
| 9714 | |
| 9715 | \f |
| 9716 | /* Initialize the current architecture based on INFO. If possible, |
| 9717 | re-use an architecture from ARCHES, which is a list of |
| 9718 | architectures already created during this debugging session. |
| 9719 | |
| 9720 | Called e.g. at program startup, when reading a core file, and when |
| 9721 | reading a binary file. */ |
| 9722 | |
| 9723 | static struct gdbarch * |
| 9724 | arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 9725 | { |
| 9726 | struct gdbarch_tdep *tdep; |
| 9727 | struct gdbarch *gdbarch; |
| 9728 | struct gdbarch_list *best_arch; |
| 9729 | enum arm_abi_kind arm_abi = arm_abi_global; |
| 9730 | enum arm_float_model fp_model = arm_fp_model; |
| 9731 | struct tdesc_arch_data *tdesc_data = NULL; |
| 9732 | int i, is_m = 0; |
| 9733 | int have_vfp_registers = 0, have_vfp_pseudos = 0, have_neon_pseudos = 0; |
| 9734 | int have_neon = 0; |
| 9735 | int have_fpa_registers = 1; |
| 9736 | const struct target_desc *tdesc = info.target_desc; |
| 9737 | |
| 9738 | /* If we have an object to base this architecture on, try to determine |
| 9739 | its ABI. */ |
| 9740 | |
| 9741 | if (arm_abi == ARM_ABI_AUTO && info.abfd != NULL) |
| 9742 | { |
| 9743 | int ei_osabi, e_flags; |
| 9744 | |
| 9745 | switch (bfd_get_flavour (info.abfd)) |
| 9746 | { |
| 9747 | case bfd_target_aout_flavour: |
| 9748 | /* Assume it's an old APCS-style ABI. */ |
| 9749 | arm_abi = ARM_ABI_APCS; |
| 9750 | break; |
| 9751 | |
| 9752 | case bfd_target_coff_flavour: |
| 9753 | /* Assume it's an old APCS-style ABI. */ |
| 9754 | /* XXX WinCE? */ |
| 9755 | arm_abi = ARM_ABI_APCS; |
| 9756 | break; |
| 9757 | |
| 9758 | case bfd_target_elf_flavour: |
| 9759 | ei_osabi = elf_elfheader (info.abfd)->e_ident[EI_OSABI]; |
| 9760 | e_flags = elf_elfheader (info.abfd)->e_flags; |
| 9761 | |
| 9762 | if (ei_osabi == ELFOSABI_ARM) |
| 9763 | { |
| 9764 | /* GNU tools used to use this value, but do not for EABI |
| 9765 | objects. There's nowhere to tag an EABI version |
| 9766 | anyway, so assume APCS. */ |
| 9767 | arm_abi = ARM_ABI_APCS; |
| 9768 | } |
| 9769 | else if (ei_osabi == ELFOSABI_NONE) |
| 9770 | { |
| 9771 | int eabi_ver = EF_ARM_EABI_VERSION (e_flags); |
| 9772 | int attr_arch, attr_profile; |
| 9773 | |
| 9774 | switch (eabi_ver) |
| 9775 | { |
| 9776 | case EF_ARM_EABI_UNKNOWN: |
| 9777 | /* Assume GNU tools. */ |
| 9778 | arm_abi = ARM_ABI_APCS; |
| 9779 | break; |
| 9780 | |
| 9781 | case EF_ARM_EABI_VER4: |
| 9782 | case EF_ARM_EABI_VER5: |
| 9783 | arm_abi = ARM_ABI_AAPCS; |
| 9784 | /* EABI binaries default to VFP float ordering. |
| 9785 | They may also contain build attributes that can |
| 9786 | be used to identify if the VFP argument-passing |
| 9787 | ABI is in use. */ |
| 9788 | if (fp_model == ARM_FLOAT_AUTO) |
| 9789 | { |
| 9790 | #ifdef HAVE_ELF |
| 9791 | switch (bfd_elf_get_obj_attr_int (info.abfd, |
| 9792 | OBJ_ATTR_PROC, |
| 9793 | Tag_ABI_VFP_args)) |
| 9794 | { |
| 9795 | case 0: |
| 9796 | /* "The user intended FP parameter/result |
| 9797 | passing to conform to AAPCS, base |
| 9798 | variant". */ |
| 9799 | fp_model = ARM_FLOAT_SOFT_VFP; |
| 9800 | break; |
| 9801 | case 1: |
| 9802 | /* "The user intended FP parameter/result |
| 9803 | passing to conform to AAPCS, VFP |
| 9804 | variant". */ |
| 9805 | fp_model = ARM_FLOAT_VFP; |
| 9806 | break; |
| 9807 | case 2: |
| 9808 | /* "The user intended FP parameter/result |
| 9809 | passing to conform to tool chain-specific |
| 9810 | conventions" - we don't know any such |
| 9811 | conventions, so leave it as "auto". */ |
| 9812 | break; |
| 9813 | default: |
| 9814 | /* Attribute value not mentioned in the |
| 9815 | October 2008 ABI, so leave it as |
| 9816 | "auto". */ |
| 9817 | break; |
| 9818 | } |
| 9819 | #else |
| 9820 | fp_model = ARM_FLOAT_SOFT_VFP; |
| 9821 | #endif |
| 9822 | } |
| 9823 | break; |
| 9824 | |
| 9825 | default: |
| 9826 | /* Leave it as "auto". */ |
| 9827 | warning (_("unknown ARM EABI version 0x%x"), eabi_ver); |
| 9828 | break; |
| 9829 | } |
| 9830 | |
| 9831 | #ifdef HAVE_ELF |
| 9832 | /* Detect M-profile programs. This only works if the |
| 9833 | executable file includes build attributes; GCC does |
| 9834 | copy them to the executable, but e.g. RealView does |
| 9835 | not. */ |
| 9836 | attr_arch = bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_PROC, |
| 9837 | Tag_CPU_arch); |
| 9838 | attr_profile = bfd_elf_get_obj_attr_int (info.abfd, |
| 9839 | OBJ_ATTR_PROC, |
| 9840 | Tag_CPU_arch_profile); |
| 9841 | /* GCC specifies the profile for v6-M; RealView only |
| 9842 | specifies the profile for architectures starting with |
| 9843 | V7 (as opposed to architectures with a tag |
| 9844 | numerically greater than TAG_CPU_ARCH_V7). */ |
| 9845 | if (!tdesc_has_registers (tdesc) |
| 9846 | && (attr_arch == TAG_CPU_ARCH_V6_M |
| 9847 | || attr_arch == TAG_CPU_ARCH_V6S_M |
| 9848 | || attr_profile == 'M')) |
| 9849 | is_m = 1; |
| 9850 | #endif |
| 9851 | } |
| 9852 | |
| 9853 | if (fp_model == ARM_FLOAT_AUTO) |
| 9854 | { |
| 9855 | int e_flags = elf_elfheader (info.abfd)->e_flags; |
| 9856 | |
| 9857 | switch (e_flags & (EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT)) |
| 9858 | { |
| 9859 | case 0: |
| 9860 | /* Leave it as "auto". Strictly speaking this case |
| 9861 | means FPA, but almost nobody uses that now, and |
| 9862 | many toolchains fail to set the appropriate bits |
| 9863 | for the floating-point model they use. */ |
| 9864 | break; |
| 9865 | case EF_ARM_SOFT_FLOAT: |
| 9866 | fp_model = ARM_FLOAT_SOFT_FPA; |
| 9867 | break; |
| 9868 | case EF_ARM_VFP_FLOAT: |
| 9869 | fp_model = ARM_FLOAT_VFP; |
| 9870 | break; |
| 9871 | case EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT: |
| 9872 | fp_model = ARM_FLOAT_SOFT_VFP; |
| 9873 | break; |
| 9874 | } |
| 9875 | } |
| 9876 | |
| 9877 | if (e_flags & EF_ARM_BE8) |
| 9878 | info.byte_order_for_code = BFD_ENDIAN_LITTLE; |
| 9879 | |
| 9880 | break; |
| 9881 | |
| 9882 | default: |
| 9883 | /* Leave it as "auto". */ |
| 9884 | break; |
| 9885 | } |
| 9886 | } |
| 9887 | |
| 9888 | /* Check any target description for validity. */ |
| 9889 | if (tdesc_has_registers (tdesc)) |
| 9890 | { |
| 9891 | /* For most registers we require GDB's default names; but also allow |
| 9892 | the numeric names for sp / lr / pc, as a convenience. */ |
| 9893 | static const char *const arm_sp_names[] = { "r13", "sp", NULL }; |
| 9894 | static const char *const arm_lr_names[] = { "r14", "lr", NULL }; |
| 9895 | static const char *const arm_pc_names[] = { "r15", "pc", NULL }; |
| 9896 | |
| 9897 | const struct tdesc_feature *feature; |
| 9898 | int valid_p; |
| 9899 | |
| 9900 | feature = tdesc_find_feature (tdesc, |
| 9901 | "org.gnu.gdb.arm.core"); |
| 9902 | if (feature == NULL) |
| 9903 | { |
| 9904 | feature = tdesc_find_feature (tdesc, |
| 9905 | "org.gnu.gdb.arm.m-profile"); |
| 9906 | if (feature == NULL) |
| 9907 | return NULL; |
| 9908 | else |
| 9909 | is_m = 1; |
| 9910 | } |
| 9911 | |
| 9912 | tdesc_data = tdesc_data_alloc (); |
| 9913 | |
| 9914 | valid_p = 1; |
| 9915 | for (i = 0; i < ARM_SP_REGNUM; i++) |
| 9916 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, |
| 9917 | arm_register_names[i]); |
| 9918 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, |
| 9919 | ARM_SP_REGNUM, |
| 9920 | arm_sp_names); |
| 9921 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, |
| 9922 | ARM_LR_REGNUM, |
| 9923 | arm_lr_names); |
| 9924 | valid_p &= tdesc_numbered_register_choices (feature, tdesc_data, |
| 9925 | ARM_PC_REGNUM, |
| 9926 | arm_pc_names); |
| 9927 | if (is_m) |
| 9928 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 9929 | ARM_PS_REGNUM, "xpsr"); |
| 9930 | else |
| 9931 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 9932 | ARM_PS_REGNUM, "cpsr"); |
| 9933 | |
| 9934 | if (!valid_p) |
| 9935 | { |
| 9936 | tdesc_data_cleanup (tdesc_data); |
| 9937 | return NULL; |
| 9938 | } |
| 9939 | |
| 9940 | feature = tdesc_find_feature (tdesc, |
| 9941 | "org.gnu.gdb.arm.fpa"); |
| 9942 | if (feature != NULL) |
| 9943 | { |
| 9944 | valid_p = 1; |
| 9945 | for (i = ARM_F0_REGNUM; i <= ARM_FPS_REGNUM; i++) |
| 9946 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, |
| 9947 | arm_register_names[i]); |
| 9948 | if (!valid_p) |
| 9949 | { |
| 9950 | tdesc_data_cleanup (tdesc_data); |
| 9951 | return NULL; |
| 9952 | } |
| 9953 | } |
| 9954 | else |
| 9955 | have_fpa_registers = 0; |
| 9956 | |
| 9957 | feature = tdesc_find_feature (tdesc, |
| 9958 | "org.gnu.gdb.xscale.iwmmxt"); |
| 9959 | if (feature != NULL) |
| 9960 | { |
| 9961 | static const char *const iwmmxt_names[] = { |
| 9962 | "wR0", "wR1", "wR2", "wR3", "wR4", "wR5", "wR6", "wR7", |
| 9963 | "wR8", "wR9", "wR10", "wR11", "wR12", "wR13", "wR14", "wR15", |
| 9964 | "wCID", "wCon", "wCSSF", "wCASF", "", "", "", "", |
| 9965 | "wCGR0", "wCGR1", "wCGR2", "wCGR3", "", "", "", "", |
| 9966 | }; |
| 9967 | |
| 9968 | valid_p = 1; |
| 9969 | for (i = ARM_WR0_REGNUM; i <= ARM_WR15_REGNUM; i++) |
| 9970 | valid_p |
| 9971 | &= tdesc_numbered_register (feature, tdesc_data, i, |
| 9972 | iwmmxt_names[i - ARM_WR0_REGNUM]); |
| 9973 | |
| 9974 | /* Check for the control registers, but do not fail if they |
| 9975 | are missing. */ |
| 9976 | for (i = ARM_WC0_REGNUM; i <= ARM_WCASF_REGNUM; i++) |
| 9977 | tdesc_numbered_register (feature, tdesc_data, i, |
| 9978 | iwmmxt_names[i - ARM_WR0_REGNUM]); |
| 9979 | |
| 9980 | for (i = ARM_WCGR0_REGNUM; i <= ARM_WCGR3_REGNUM; i++) |
| 9981 | valid_p |
| 9982 | &= tdesc_numbered_register (feature, tdesc_data, i, |
| 9983 | iwmmxt_names[i - ARM_WR0_REGNUM]); |
| 9984 | |
| 9985 | if (!valid_p) |
| 9986 | { |
| 9987 | tdesc_data_cleanup (tdesc_data); |
| 9988 | return NULL; |
| 9989 | } |
| 9990 | } |
| 9991 | |
| 9992 | /* If we have a VFP unit, check whether the single precision registers |
| 9993 | are present. If not, then we will synthesize them as pseudo |
| 9994 | registers. */ |
| 9995 | feature = tdesc_find_feature (tdesc, |
| 9996 | "org.gnu.gdb.arm.vfp"); |
| 9997 | if (feature != NULL) |
| 9998 | { |
| 9999 | static const char *const vfp_double_names[] = { |
| 10000 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
| 10001 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", "d15", |
| 10002 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", |
| 10003 | "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31", |
| 10004 | }; |
| 10005 | |
| 10006 | /* Require the double precision registers. There must be either |
| 10007 | 16 or 32. */ |
| 10008 | valid_p = 1; |
| 10009 | for (i = 0; i < 32; i++) |
| 10010 | { |
| 10011 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 10012 | ARM_D0_REGNUM + i, |
| 10013 | vfp_double_names[i]); |
| 10014 | if (!valid_p) |
| 10015 | break; |
| 10016 | } |
| 10017 | if (!valid_p && i == 16) |
| 10018 | valid_p = 1; |
| 10019 | |
| 10020 | /* Also require FPSCR. */ |
| 10021 | valid_p &= tdesc_numbered_register (feature, tdesc_data, |
| 10022 | ARM_FPSCR_REGNUM, "fpscr"); |
| 10023 | if (!valid_p) |
| 10024 | { |
| 10025 | tdesc_data_cleanup (tdesc_data); |
| 10026 | return NULL; |
| 10027 | } |
| 10028 | |
| 10029 | if (tdesc_unnumbered_register (feature, "s0") == 0) |
| 10030 | have_vfp_pseudos = 1; |
| 10031 | |
| 10032 | have_vfp_registers = 1; |
| 10033 | |
| 10034 | /* If we have VFP, also check for NEON. The architecture allows |
| 10035 | NEON without VFP (integer vector operations only), but GDB |
| 10036 | does not support that. */ |
| 10037 | feature = tdesc_find_feature (tdesc, |
| 10038 | "org.gnu.gdb.arm.neon"); |
| 10039 | if (feature != NULL) |
| 10040 | { |
| 10041 | /* NEON requires 32 double-precision registers. */ |
| 10042 | if (i != 32) |
| 10043 | { |
| 10044 | tdesc_data_cleanup (tdesc_data); |
| 10045 | return NULL; |
| 10046 | } |
| 10047 | |
| 10048 | /* If there are quad registers defined by the stub, use |
| 10049 | their type; otherwise (normally) provide them with |
| 10050 | the default type. */ |
| 10051 | if (tdesc_unnumbered_register (feature, "q0") == 0) |
| 10052 | have_neon_pseudos = 1; |
| 10053 | |
| 10054 | have_neon = 1; |
| 10055 | } |
| 10056 | } |
| 10057 | } |
| 10058 | |
| 10059 | /* If there is already a candidate, use it. */ |
| 10060 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); |
| 10061 | best_arch != NULL; |
| 10062 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) |
| 10063 | { |
| 10064 | if (arm_abi != ARM_ABI_AUTO |
| 10065 | && arm_abi != gdbarch_tdep (best_arch->gdbarch)->arm_abi) |
| 10066 | continue; |
| 10067 | |
| 10068 | if (fp_model != ARM_FLOAT_AUTO |
| 10069 | && fp_model != gdbarch_tdep (best_arch->gdbarch)->fp_model) |
| 10070 | continue; |
| 10071 | |
| 10072 | /* There are various other properties in tdep that we do not |
| 10073 | need to check here: those derived from a target description, |
| 10074 | since gdbarches with a different target description are |
| 10075 | automatically disqualified. */ |
| 10076 | |
| 10077 | /* Do check is_m, though, since it might come from the binary. */ |
| 10078 | if (is_m != gdbarch_tdep (best_arch->gdbarch)->is_m) |
| 10079 | continue; |
| 10080 | |
| 10081 | /* Found a match. */ |
| 10082 | break; |
| 10083 | } |
| 10084 | |
| 10085 | if (best_arch != NULL) |
| 10086 | { |
| 10087 | if (tdesc_data != NULL) |
| 10088 | tdesc_data_cleanup (tdesc_data); |
| 10089 | return best_arch->gdbarch; |
| 10090 | } |
| 10091 | |
| 10092 | tdep = xcalloc (1, sizeof (struct gdbarch_tdep)); |
| 10093 | gdbarch = gdbarch_alloc (&info, tdep); |
| 10094 | |
| 10095 | /* Record additional information about the architecture we are defining. |
| 10096 | These are gdbarch discriminators, like the OSABI. */ |
| 10097 | tdep->arm_abi = arm_abi; |
| 10098 | tdep->fp_model = fp_model; |
| 10099 | tdep->is_m = is_m; |
| 10100 | tdep->have_fpa_registers = have_fpa_registers; |
| 10101 | tdep->have_vfp_registers = have_vfp_registers; |
| 10102 | tdep->have_vfp_pseudos = have_vfp_pseudos; |
| 10103 | tdep->have_neon_pseudos = have_neon_pseudos; |
| 10104 | tdep->have_neon = have_neon; |
| 10105 | |
| 10106 | arm_register_g_packet_guesses (gdbarch); |
| 10107 | |
| 10108 | /* Breakpoints. */ |
| 10109 | switch (info.byte_order_for_code) |
| 10110 | { |
| 10111 | case BFD_ENDIAN_BIG: |
| 10112 | tdep->arm_breakpoint = arm_default_arm_be_breakpoint; |
| 10113 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint); |
| 10114 | tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint; |
| 10115 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint); |
| 10116 | |
| 10117 | break; |
| 10118 | |
| 10119 | case BFD_ENDIAN_LITTLE: |
| 10120 | tdep->arm_breakpoint = arm_default_arm_le_breakpoint; |
| 10121 | tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint); |
| 10122 | tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint; |
| 10123 | tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint); |
| 10124 | |
| 10125 | break; |
| 10126 | |
| 10127 | default: |
| 10128 | internal_error (__FILE__, __LINE__, |
| 10129 | _("arm_gdbarch_init: bad byte order for float format")); |
| 10130 | } |
| 10131 | |
| 10132 | /* On ARM targets char defaults to unsigned. */ |
| 10133 | set_gdbarch_char_signed (gdbarch, 0); |
| 10134 | |
| 10135 | /* Note: for displaced stepping, this includes the breakpoint, and one word |
| 10136 | of additional scratch space. This setting isn't used for anything beside |
| 10137 | displaced stepping at present. */ |
| 10138 | set_gdbarch_max_insn_length (gdbarch, 4 * DISPLACED_MODIFIED_INSNS); |
| 10139 | |
| 10140 | /* This should be low enough for everything. */ |
| 10141 | tdep->lowest_pc = 0x20; |
| 10142 | tdep->jb_pc = -1; /* Longjump support not enabled by default. */ |
| 10143 | |
| 10144 | /* The default, for both APCS and AAPCS, is to return small |
| 10145 | structures in registers. */ |
| 10146 | tdep->struct_return = reg_struct_return; |
| 10147 | |
| 10148 | set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call); |
| 10149 | set_gdbarch_frame_align (gdbarch, arm_frame_align); |
| 10150 | |
| 10151 | set_gdbarch_write_pc (gdbarch, arm_write_pc); |
| 10152 | |
| 10153 | /* Frame handling. */ |
| 10154 | set_gdbarch_dummy_id (gdbarch, arm_dummy_id); |
| 10155 | set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc); |
| 10156 | set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp); |
| 10157 | |
| 10158 | frame_base_set_default (gdbarch, &arm_normal_base); |
| 10159 | |
| 10160 | /* Address manipulation. */ |
| 10161 | set_gdbarch_smash_text_address (gdbarch, arm_smash_text_address); |
| 10162 | set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove); |
| 10163 | |
| 10164 | /* Advance PC across function entry code. */ |
| 10165 | set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue); |
| 10166 | |
| 10167 | /* Detect whether PC is in function epilogue. */ |
| 10168 | set_gdbarch_in_function_epilogue_p (gdbarch, arm_in_function_epilogue_p); |
| 10169 | |
| 10170 | /* Skip trampolines. */ |
| 10171 | set_gdbarch_skip_trampoline_code (gdbarch, arm_skip_stub); |
| 10172 | |
| 10173 | /* The stack grows downward. */ |
| 10174 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 10175 | |
| 10176 | /* Breakpoint manipulation. */ |
| 10177 | set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc); |
| 10178 | set_gdbarch_remote_breakpoint_from_pc (gdbarch, |
| 10179 | arm_remote_breakpoint_from_pc); |
| 10180 | |
| 10181 | /* Information about registers, etc. */ |
| 10182 | set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM); |
| 10183 | set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM); |
| 10184 | set_gdbarch_num_regs (gdbarch, ARM_NUM_REGS); |
| 10185 | set_gdbarch_register_type (gdbarch, arm_register_type); |
| 10186 | set_gdbarch_register_reggroup_p (gdbarch, arm_register_reggroup_p); |
| 10187 | |
| 10188 | /* This "info float" is FPA-specific. Use the generic version if we |
| 10189 | do not have FPA. */ |
| 10190 | if (gdbarch_tdep (gdbarch)->have_fpa_registers) |
| 10191 | set_gdbarch_print_float_info (gdbarch, arm_print_float_info); |
| 10192 | |
| 10193 | /* Internal <-> external register number maps. */ |
| 10194 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, arm_dwarf_reg_to_regnum); |
| 10195 | set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno); |
| 10196 | |
| 10197 | set_gdbarch_register_name (gdbarch, arm_register_name); |
| 10198 | |
| 10199 | /* Returning results. */ |
| 10200 | set_gdbarch_return_value (gdbarch, arm_return_value); |
| 10201 | |
| 10202 | /* Disassembly. */ |
| 10203 | set_gdbarch_print_insn (gdbarch, gdb_print_insn_arm); |
| 10204 | |
| 10205 | /* Minsymbol frobbing. */ |
| 10206 | set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special); |
| 10207 | set_gdbarch_coff_make_msymbol_special (gdbarch, |
| 10208 | arm_coff_make_msymbol_special); |
| 10209 | set_gdbarch_record_special_symbol (gdbarch, arm_record_special_symbol); |
| 10210 | |
| 10211 | /* Thumb-2 IT block support. */ |
| 10212 | set_gdbarch_adjust_breakpoint_address (gdbarch, |
| 10213 | arm_adjust_breakpoint_address); |
| 10214 | |
| 10215 | /* Virtual tables. */ |
| 10216 | set_gdbarch_vbit_in_delta (gdbarch, 1); |
| 10217 | |
| 10218 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
| 10219 | gdbarch_init_osabi (info, gdbarch); |
| 10220 | |
| 10221 | dwarf2_frame_set_init_reg (gdbarch, arm_dwarf2_frame_init_reg); |
| 10222 | |
| 10223 | /* Add some default predicates. */ |
| 10224 | frame_unwind_append_unwinder (gdbarch, &arm_stub_unwind); |
| 10225 | dwarf2_append_unwinders (gdbarch); |
| 10226 | frame_unwind_append_unwinder (gdbarch, &arm_exidx_unwind); |
| 10227 | frame_unwind_append_unwinder (gdbarch, &arm_prologue_unwind); |
| 10228 | |
| 10229 | /* Now we have tuned the configuration, set a few final things, |
| 10230 | based on what the OS ABI has told us. */ |
| 10231 | |
| 10232 | /* If the ABI is not otherwise marked, assume the old GNU APCS. EABI |
| 10233 | binaries are always marked. */ |
| 10234 | if (tdep->arm_abi == ARM_ABI_AUTO) |
| 10235 | tdep->arm_abi = ARM_ABI_APCS; |
| 10236 | |
| 10237 | /* Watchpoints are not steppable. */ |
| 10238 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); |
| 10239 | |
| 10240 | /* We used to default to FPA for generic ARM, but almost nobody |
| 10241 | uses that now, and we now provide a way for the user to force |
| 10242 | the model. So default to the most useful variant. */ |
| 10243 | if (tdep->fp_model == ARM_FLOAT_AUTO) |
| 10244 | tdep->fp_model = ARM_FLOAT_SOFT_FPA; |
| 10245 | |
| 10246 | if (tdep->jb_pc >= 0) |
| 10247 | set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target); |
| 10248 | |
| 10249 | /* Floating point sizes and format. */ |
| 10250 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
| 10251 | if (tdep->fp_model == ARM_FLOAT_SOFT_FPA || tdep->fp_model == ARM_FLOAT_FPA) |
| 10252 | { |
| 10253 | set_gdbarch_double_format |
| 10254 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); |
| 10255 | set_gdbarch_long_double_format |
| 10256 | (gdbarch, floatformats_ieee_double_littlebyte_bigword); |
| 10257 | } |
| 10258 | else |
| 10259 | { |
| 10260 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); |
| 10261 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); |
| 10262 | } |
| 10263 | |
| 10264 | if (have_vfp_pseudos) |
| 10265 | { |
| 10266 | /* NOTE: These are the only pseudo registers used by |
| 10267 | the ARM target at the moment. If more are added, a |
| 10268 | little more care in numbering will be needed. */ |
| 10269 | |
| 10270 | int num_pseudos = 32; |
| 10271 | if (have_neon_pseudos) |
| 10272 | num_pseudos += 16; |
| 10273 | set_gdbarch_num_pseudo_regs (gdbarch, num_pseudos); |
| 10274 | set_gdbarch_pseudo_register_read (gdbarch, arm_pseudo_read); |
| 10275 | set_gdbarch_pseudo_register_write (gdbarch, arm_pseudo_write); |
| 10276 | } |
| 10277 | |
| 10278 | if (tdesc_data) |
| 10279 | { |
| 10280 | set_tdesc_pseudo_register_name (gdbarch, arm_register_name); |
| 10281 | |
| 10282 | tdesc_use_registers (gdbarch, tdesc, tdesc_data); |
| 10283 | |
| 10284 | /* Override tdesc_register_type to adjust the types of VFP |
| 10285 | registers for NEON. */ |
| 10286 | set_gdbarch_register_type (gdbarch, arm_register_type); |
| 10287 | } |
| 10288 | |
| 10289 | /* Add standard register aliases. We add aliases even for those |
| 10290 | nanes which are used by the current architecture - it's simpler, |
| 10291 | and does no harm, since nothing ever lists user registers. */ |
| 10292 | for (i = 0; i < ARRAY_SIZE (arm_register_aliases); i++) |
| 10293 | user_reg_add (gdbarch, arm_register_aliases[i].name, |
| 10294 | value_of_arm_user_reg, &arm_register_aliases[i].regnum); |
| 10295 | |
| 10296 | return gdbarch; |
| 10297 | } |
| 10298 | |
| 10299 | static void |
| 10300 | arm_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
| 10301 | { |
| 10302 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 10303 | |
| 10304 | if (tdep == NULL) |
| 10305 | return; |
| 10306 | |
| 10307 | fprintf_unfiltered (file, _("arm_dump_tdep: Lowest pc = 0x%lx"), |
| 10308 | (unsigned long) tdep->lowest_pc); |
| 10309 | } |
| 10310 | |
| 10311 | extern initialize_file_ftype _initialize_arm_tdep; /* -Wmissing-prototypes */ |
| 10312 | |
| 10313 | void |
| 10314 | _initialize_arm_tdep (void) |
| 10315 | { |
| 10316 | struct ui_file *stb; |
| 10317 | long length; |
| 10318 | struct cmd_list_element *new_set, *new_show; |
| 10319 | const char *setname; |
| 10320 | const char *setdesc; |
| 10321 | const char *const *regnames; |
| 10322 | int numregs, i, j; |
| 10323 | static char *helptext; |
| 10324 | char regdesc[1024], *rdptr = regdesc; |
| 10325 | size_t rest = sizeof (regdesc); |
| 10326 | |
| 10327 | gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep); |
| 10328 | |
| 10329 | arm_objfile_data_key |
| 10330 | = register_objfile_data_with_cleanup (NULL, arm_objfile_data_free); |
| 10331 | |
| 10332 | /* Add ourselves to objfile event chain. */ |
| 10333 | observer_attach_new_objfile (arm_exidx_new_objfile); |
| 10334 | arm_exidx_data_key |
| 10335 | = register_objfile_data_with_cleanup (NULL, arm_exidx_data_free); |
| 10336 | |
| 10337 | /* Register an ELF OS ABI sniffer for ARM binaries. */ |
| 10338 | gdbarch_register_osabi_sniffer (bfd_arch_arm, |
| 10339 | bfd_target_elf_flavour, |
| 10340 | arm_elf_osabi_sniffer); |
| 10341 | |
| 10342 | /* Initialize the standard target descriptions. */ |
| 10343 | initialize_tdesc_arm_with_m (); |
| 10344 | initialize_tdesc_arm_with_m_fpa_layout (); |
| 10345 | initialize_tdesc_arm_with_m_vfp_d16 (); |
| 10346 | initialize_tdesc_arm_with_iwmmxt (); |
| 10347 | initialize_tdesc_arm_with_vfpv2 (); |
| 10348 | initialize_tdesc_arm_with_vfpv3 (); |
| 10349 | initialize_tdesc_arm_with_neon (); |
| 10350 | |
| 10351 | /* Get the number of possible sets of register names defined in opcodes. */ |
| 10352 | num_disassembly_options = get_arm_regname_num_options (); |
| 10353 | |
| 10354 | /* Add root prefix command for all "set arm"/"show arm" commands. */ |
| 10355 | add_prefix_cmd ("arm", no_class, set_arm_command, |
| 10356 | _("Various ARM-specific commands."), |
| 10357 | &setarmcmdlist, "set arm ", 0, &setlist); |
| 10358 | |
| 10359 | add_prefix_cmd ("arm", no_class, show_arm_command, |
| 10360 | _("Various ARM-specific commands."), |
| 10361 | &showarmcmdlist, "show arm ", 0, &showlist); |
| 10362 | |
| 10363 | /* Sync the opcode insn printer with our register viewer. */ |
| 10364 | parse_arm_disassembler_option ("reg-names-std"); |
| 10365 | |
| 10366 | /* Initialize the array that will be passed to |
| 10367 | add_setshow_enum_cmd(). */ |
| 10368 | valid_disassembly_styles |
| 10369 | = xmalloc ((num_disassembly_options + 1) * sizeof (char *)); |
| 10370 | for (i = 0; i < num_disassembly_options; i++) |
| 10371 | { |
| 10372 | numregs = get_arm_regnames (i, &setname, &setdesc, ®names); |
| 10373 | valid_disassembly_styles[i] = setname; |
| 10374 | length = snprintf (rdptr, rest, "%s - %s\n", setname, setdesc); |
| 10375 | rdptr += length; |
| 10376 | rest -= length; |
| 10377 | /* When we find the default names, tell the disassembler to use |
| 10378 | them. */ |
| 10379 | if (!strcmp (setname, "std")) |
| 10380 | { |
| 10381 | disassembly_style = setname; |
| 10382 | set_arm_regname_option (i); |
| 10383 | } |
| 10384 | } |
| 10385 | /* Mark the end of valid options. */ |
| 10386 | valid_disassembly_styles[num_disassembly_options] = NULL; |
| 10387 | |
| 10388 | /* Create the help text. */ |
| 10389 | stb = mem_fileopen (); |
| 10390 | fprintf_unfiltered (stb, "%s%s%s", |
| 10391 | _("The valid values are:\n"), |
| 10392 | regdesc, |
| 10393 | _("The default is \"std\".")); |
| 10394 | helptext = ui_file_xstrdup (stb, NULL); |
| 10395 | ui_file_delete (stb); |
| 10396 | |
| 10397 | add_setshow_enum_cmd("disassembler", no_class, |
| 10398 | valid_disassembly_styles, &disassembly_style, |
| 10399 | _("Set the disassembly style."), |
| 10400 | _("Show the disassembly style."), |
| 10401 | helptext, |
| 10402 | set_disassembly_style_sfunc, |
| 10403 | NULL, /* FIXME: i18n: The disassembly style is |
| 10404 | \"%s\". */ |
| 10405 | &setarmcmdlist, &showarmcmdlist); |
| 10406 | |
| 10407 | add_setshow_boolean_cmd ("apcs32", no_class, &arm_apcs_32, |
| 10408 | _("Set usage of ARM 32-bit mode."), |
| 10409 | _("Show usage of ARM 32-bit mode."), |
| 10410 | _("When off, a 26-bit PC will be used."), |
| 10411 | NULL, |
| 10412 | NULL, /* FIXME: i18n: Usage of ARM 32-bit |
| 10413 | mode is %s. */ |
| 10414 | &setarmcmdlist, &showarmcmdlist); |
| 10415 | |
| 10416 | /* Add a command to allow the user to force the FPU model. */ |
| 10417 | add_setshow_enum_cmd ("fpu", no_class, fp_model_strings, ¤t_fp_model, |
| 10418 | _("Set the floating point type."), |
| 10419 | _("Show the floating point type."), |
| 10420 | _("auto - Determine the FP typefrom the OS-ABI.\n\ |
| 10421 | softfpa - Software FP, mixed-endian doubles on little-endian ARMs.\n\ |
| 10422 | fpa - FPA co-processor (GCC compiled).\n\ |
| 10423 | softvfp - Software FP with pure-endian doubles.\n\ |
| 10424 | vfp - VFP co-processor."), |
| 10425 | set_fp_model_sfunc, show_fp_model, |
| 10426 | &setarmcmdlist, &showarmcmdlist); |
| 10427 | |
| 10428 | /* Add a command to allow the user to force the ABI. */ |
| 10429 | add_setshow_enum_cmd ("abi", class_support, arm_abi_strings, &arm_abi_string, |
| 10430 | _("Set the ABI."), |
| 10431 | _("Show the ABI."), |
| 10432 | NULL, arm_set_abi, arm_show_abi, |
| 10433 | &setarmcmdlist, &showarmcmdlist); |
| 10434 | |
| 10435 | /* Add two commands to allow the user to force the assumed |
| 10436 | execution mode. */ |
| 10437 | add_setshow_enum_cmd ("fallback-mode", class_support, |
| 10438 | arm_mode_strings, &arm_fallback_mode_string, |
| 10439 | _("Set the mode assumed when symbols are unavailable."), |
| 10440 | _("Show the mode assumed when symbols are unavailable."), |
| 10441 | NULL, NULL, arm_show_fallback_mode, |
| 10442 | &setarmcmdlist, &showarmcmdlist); |
| 10443 | add_setshow_enum_cmd ("force-mode", class_support, |
| 10444 | arm_mode_strings, &arm_force_mode_string, |
| 10445 | _("Set the mode assumed even when symbols are available."), |
| 10446 | _("Show the mode assumed even when symbols are available."), |
| 10447 | NULL, NULL, arm_show_force_mode, |
| 10448 | &setarmcmdlist, &showarmcmdlist); |
| 10449 | |
| 10450 | /* Debugging flag. */ |
| 10451 | add_setshow_boolean_cmd ("arm", class_maintenance, &arm_debug, |
| 10452 | _("Set ARM debugging."), |
| 10453 | _("Show ARM debugging."), |
| 10454 | _("When on, arm-specific debugging is enabled."), |
| 10455 | NULL, |
| 10456 | NULL, /* FIXME: i18n: "ARM debugging is %s. */ |
| 10457 | &setdebuglist, &showdebuglist); |
| 10458 | } |
| 10459 | |
| 10460 | /* ARM-reversible process record data structures. */ |
| 10461 | |
| 10462 | #define ARM_INSN_SIZE_BYTES 4 |
| 10463 | #define THUMB_INSN_SIZE_BYTES 2 |
| 10464 | #define THUMB2_INSN_SIZE_BYTES 4 |
| 10465 | |
| 10466 | |
| 10467 | #define INSN_S_L_BIT_NUM 20 |
| 10468 | |
| 10469 | #define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \ |
| 10470 | do \ |
| 10471 | { \ |
| 10472 | unsigned int reg_len = LENGTH; \ |
| 10473 | if (reg_len) \ |
| 10474 | { \ |
| 10475 | REGS = XNEWVEC (uint32_t, reg_len); \ |
| 10476 | memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH); \ |
| 10477 | } \ |
| 10478 | } \ |
| 10479 | while (0) |
| 10480 | |
| 10481 | #define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \ |
| 10482 | do \ |
| 10483 | { \ |
| 10484 | unsigned int mem_len = LENGTH; \ |
| 10485 | if (mem_len) \ |
| 10486 | { \ |
| 10487 | MEMS = XNEWVEC (struct arm_mem_r, mem_len); \ |
| 10488 | memcpy(&MEMS->len, &RECORD_BUF[0], \ |
| 10489 | sizeof(struct arm_mem_r) * LENGTH); \ |
| 10490 | } \ |
| 10491 | } \ |
| 10492 | while (0) |
| 10493 | |
| 10494 | /* Checks whether insn is already recorded or yet to be decoded. (boolean expression). */ |
| 10495 | #define INSN_RECORDED(ARM_RECORD) \ |
| 10496 | (0 != (ARM_RECORD)->reg_rec_count || 0 != (ARM_RECORD)->mem_rec_count) |
| 10497 | |
| 10498 | /* ARM memory record structure. */ |
| 10499 | struct arm_mem_r |
| 10500 | { |
| 10501 | uint32_t len; /* Record length. */ |
| 10502 | CORE_ADDR addr; /* Memory address. */ |
| 10503 | }; |
| 10504 | |
| 10505 | /* ARM instruction record contains opcode of current insn |
| 10506 | and execution state (before entry to decode_insn()), |
| 10507 | contains list of to-be-modified registers and |
| 10508 | memory blocks (on return from decode_insn()). */ |
| 10509 | |
| 10510 | typedef struct insn_decode_record_t |
| 10511 | { |
| 10512 | struct gdbarch *gdbarch; |
| 10513 | struct regcache *regcache; |
| 10514 | CORE_ADDR this_addr; /* Address of the insn being decoded. */ |
| 10515 | uint32_t arm_insn; /* Should accommodate thumb. */ |
| 10516 | uint32_t cond; /* Condition code. */ |
| 10517 | uint32_t opcode; /* Insn opcode. */ |
| 10518 | uint32_t decode; /* Insn decode bits. */ |
| 10519 | uint32_t mem_rec_count; /* No of mem records. */ |
| 10520 | uint32_t reg_rec_count; /* No of reg records. */ |
| 10521 | uint32_t *arm_regs; /* Registers to be saved for this record. */ |
| 10522 | struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */ |
| 10523 | } insn_decode_record; |
| 10524 | |
| 10525 | |
| 10526 | /* Checks ARM SBZ and SBO mandatory fields. */ |
| 10527 | |
| 10528 | static int |
| 10529 | sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo) |
| 10530 | { |
| 10531 | uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1)); |
| 10532 | |
| 10533 | if (!len) |
| 10534 | return 1; |
| 10535 | |
| 10536 | if (!sbo) |
| 10537 | ones = ~ones; |
| 10538 | |
| 10539 | while (ones) |
| 10540 | { |
| 10541 | if (!(ones & sbo)) |
| 10542 | { |
| 10543 | return 0; |
| 10544 | } |
| 10545 | ones = ones >> 1; |
| 10546 | } |
| 10547 | return 1; |
| 10548 | } |
| 10549 | |
| 10550 | typedef enum |
| 10551 | { |
| 10552 | ARM_RECORD_STRH=1, |
| 10553 | ARM_RECORD_STRD |
| 10554 | } arm_record_strx_t; |
| 10555 | |
| 10556 | typedef enum |
| 10557 | { |
| 10558 | ARM_RECORD=1, |
| 10559 | THUMB_RECORD, |
| 10560 | THUMB2_RECORD |
| 10561 | } record_type_t; |
| 10562 | |
| 10563 | |
| 10564 | static int |
| 10565 | arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf, |
| 10566 | uint32_t *record_buf_mem, arm_record_strx_t str_type) |
| 10567 | { |
| 10568 | |
| 10569 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 10570 | ULONGEST u_regval[2]= {0}; |
| 10571 | |
| 10572 | uint32_t reg_src1 = 0, reg_src2 = 0; |
| 10573 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; |
| 10574 | uint32_t opcode1 = 0; |
| 10575 | |
| 10576 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); |
| 10577 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); |
| 10578 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); |
| 10579 | |
| 10580 | |
| 10581 | if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) |
| 10582 | { |
| 10583 | /* 1) Handle misc store, immediate offset. */ |
| 10584 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); |
| 10585 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); |
| 10586 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 10587 | regcache_raw_read_unsigned (reg_cache, reg_src1, |
| 10588 | &u_regval[0]); |
| 10589 | if (ARM_PC_REGNUM == reg_src1) |
| 10590 | { |
| 10591 | /* If R15 was used as Rn, hence current PC+8. */ |
| 10592 | u_regval[0] = u_regval[0] + 8; |
| 10593 | } |
| 10594 | offset_8 = (immed_high << 4) | immed_low; |
| 10595 | /* Calculate target store address. */ |
| 10596 | if (14 == arm_insn_r->opcode) |
| 10597 | { |
| 10598 | tgt_mem_addr = u_regval[0] + offset_8; |
| 10599 | } |
| 10600 | else |
| 10601 | { |
| 10602 | tgt_mem_addr = u_regval[0] - offset_8; |
| 10603 | } |
| 10604 | if (ARM_RECORD_STRH == str_type) |
| 10605 | { |
| 10606 | record_buf_mem[0] = 2; |
| 10607 | record_buf_mem[1] = tgt_mem_addr; |
| 10608 | arm_insn_r->mem_rec_count = 1; |
| 10609 | } |
| 10610 | else if (ARM_RECORD_STRD == str_type) |
| 10611 | { |
| 10612 | record_buf_mem[0] = 4; |
| 10613 | record_buf_mem[1] = tgt_mem_addr; |
| 10614 | record_buf_mem[2] = 4; |
| 10615 | record_buf_mem[3] = tgt_mem_addr + 4; |
| 10616 | arm_insn_r->mem_rec_count = 2; |
| 10617 | } |
| 10618 | } |
| 10619 | else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode) |
| 10620 | { |
| 10621 | /* 2) Store, register offset. */ |
| 10622 | /* Get Rm. */ |
| 10623 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); |
| 10624 | /* Get Rn. */ |
| 10625 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); |
| 10626 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 10627 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); |
| 10628 | if (15 == reg_src2) |
| 10629 | { |
| 10630 | /* If R15 was used as Rn, hence current PC+8. */ |
| 10631 | u_regval[0] = u_regval[0] + 8; |
| 10632 | } |
| 10633 | /* Calculate target store address, Rn +/- Rm, register offset. */ |
| 10634 | if (12 == arm_insn_r->opcode) |
| 10635 | { |
| 10636 | tgt_mem_addr = u_regval[0] + u_regval[1]; |
| 10637 | } |
| 10638 | else |
| 10639 | { |
| 10640 | tgt_mem_addr = u_regval[1] - u_regval[0]; |
| 10641 | } |
| 10642 | if (ARM_RECORD_STRH == str_type) |
| 10643 | { |
| 10644 | record_buf_mem[0] = 2; |
| 10645 | record_buf_mem[1] = tgt_mem_addr; |
| 10646 | arm_insn_r->mem_rec_count = 1; |
| 10647 | } |
| 10648 | else if (ARM_RECORD_STRD == str_type) |
| 10649 | { |
| 10650 | record_buf_mem[0] = 4; |
| 10651 | record_buf_mem[1] = tgt_mem_addr; |
| 10652 | record_buf_mem[2] = 4; |
| 10653 | record_buf_mem[3] = tgt_mem_addr + 4; |
| 10654 | arm_insn_r->mem_rec_count = 2; |
| 10655 | } |
| 10656 | } |
| 10657 | else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode |
| 10658 | || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) |
| 10659 | { |
| 10660 | /* 3) Store, immediate pre-indexed. */ |
| 10661 | /* 5) Store, immediate post-indexed. */ |
| 10662 | immed_low = bits (arm_insn_r->arm_insn, 0, 3); |
| 10663 | immed_high = bits (arm_insn_r->arm_insn, 8, 11); |
| 10664 | offset_8 = (immed_high << 4) | immed_low; |
| 10665 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 10666 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 10667 | /* Calculate target store address, Rn +/- Rm, register offset. */ |
| 10668 | if (15 == arm_insn_r->opcode || 6 == arm_insn_r->opcode) |
| 10669 | { |
| 10670 | tgt_mem_addr = u_regval[0] + offset_8; |
| 10671 | } |
| 10672 | else |
| 10673 | { |
| 10674 | tgt_mem_addr = u_regval[0] - offset_8; |
| 10675 | } |
| 10676 | if (ARM_RECORD_STRH == str_type) |
| 10677 | { |
| 10678 | record_buf_mem[0] = 2; |
| 10679 | record_buf_mem[1] = tgt_mem_addr; |
| 10680 | arm_insn_r->mem_rec_count = 1; |
| 10681 | } |
| 10682 | else if (ARM_RECORD_STRD == str_type) |
| 10683 | { |
| 10684 | record_buf_mem[0] = 4; |
| 10685 | record_buf_mem[1] = tgt_mem_addr; |
| 10686 | record_buf_mem[2] = 4; |
| 10687 | record_buf_mem[3] = tgt_mem_addr + 4; |
| 10688 | arm_insn_r->mem_rec_count = 2; |
| 10689 | } |
| 10690 | /* Record Rn also as it changes. */ |
| 10691 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); |
| 10692 | arm_insn_r->reg_rec_count = 1; |
| 10693 | } |
| 10694 | else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode |
| 10695 | || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) |
| 10696 | { |
| 10697 | /* 4) Store, register pre-indexed. */ |
| 10698 | /* 6) Store, register post -indexed. */ |
| 10699 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); |
| 10700 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); |
| 10701 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 10702 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); |
| 10703 | /* Calculate target store address, Rn +/- Rm, register offset. */ |
| 10704 | if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode) |
| 10705 | { |
| 10706 | tgt_mem_addr = u_regval[0] + u_regval[1]; |
| 10707 | } |
| 10708 | else |
| 10709 | { |
| 10710 | tgt_mem_addr = u_regval[1] - u_regval[0]; |
| 10711 | } |
| 10712 | if (ARM_RECORD_STRH == str_type) |
| 10713 | { |
| 10714 | record_buf_mem[0] = 2; |
| 10715 | record_buf_mem[1] = tgt_mem_addr; |
| 10716 | arm_insn_r->mem_rec_count = 1; |
| 10717 | } |
| 10718 | else if (ARM_RECORD_STRD == str_type) |
| 10719 | { |
| 10720 | record_buf_mem[0] = 4; |
| 10721 | record_buf_mem[1] = tgt_mem_addr; |
| 10722 | record_buf_mem[2] = 4; |
| 10723 | record_buf_mem[3] = tgt_mem_addr + 4; |
| 10724 | arm_insn_r->mem_rec_count = 2; |
| 10725 | } |
| 10726 | /* Record Rn also as it changes. */ |
| 10727 | *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19); |
| 10728 | arm_insn_r->reg_rec_count = 1; |
| 10729 | } |
| 10730 | return 0; |
| 10731 | } |
| 10732 | |
| 10733 | /* Handling ARM extension space insns. */ |
| 10734 | |
| 10735 | static int |
| 10736 | arm_record_extension_space (insn_decode_record *arm_insn_r) |
| 10737 | { |
| 10738 | uint32_t ret = 0; /* Return value: -1:record failure ; 0:success */ |
| 10739 | uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0; |
| 10740 | uint32_t record_buf[8], record_buf_mem[8]; |
| 10741 | uint32_t reg_src1 = 0; |
| 10742 | uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0; |
| 10743 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 10744 | ULONGEST u_regval = 0; |
| 10745 | |
| 10746 | gdb_assert (!INSN_RECORDED(arm_insn_r)); |
| 10747 | /* Handle unconditional insn extension space. */ |
| 10748 | |
| 10749 | opcode1 = bits (arm_insn_r->arm_insn, 20, 27); |
| 10750 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); |
| 10751 | if (arm_insn_r->cond) |
| 10752 | { |
| 10753 | /* PLD has no affect on architectural state, it just affects |
| 10754 | the caches. */ |
| 10755 | if (5 == ((opcode1 & 0xE0) >> 5)) |
| 10756 | { |
| 10757 | /* BLX(1) */ |
| 10758 | record_buf[0] = ARM_PS_REGNUM; |
| 10759 | record_buf[1] = ARM_LR_REGNUM; |
| 10760 | arm_insn_r->reg_rec_count = 2; |
| 10761 | } |
| 10762 | /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */ |
| 10763 | } |
| 10764 | |
| 10765 | |
| 10766 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); |
| 10767 | if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4)) |
| 10768 | { |
| 10769 | ret = -1; |
| 10770 | /* Undefined instruction on ARM V5; need to handle if later |
| 10771 | versions define it. */ |
| 10772 | } |
| 10773 | |
| 10774 | opcode1 = bits (arm_insn_r->arm_insn, 24, 27); |
| 10775 | opcode2 = bits (arm_insn_r->arm_insn, 4, 7); |
| 10776 | insn_op1 = bits (arm_insn_r->arm_insn, 20, 23); |
| 10777 | |
| 10778 | /* Handle arithmetic insn extension space. */ |
| 10779 | if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond |
| 10780 | && !INSN_RECORDED(arm_insn_r)) |
| 10781 | { |
| 10782 | /* Handle MLA(S) and MUL(S). */ |
| 10783 | if (0 <= insn_op1 && 3 >= insn_op1) |
| 10784 | { |
| 10785 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10786 | record_buf[1] = ARM_PS_REGNUM; |
| 10787 | arm_insn_r->reg_rec_count = 2; |
| 10788 | } |
| 10789 | else if (4 <= insn_op1 && 15 >= insn_op1) |
| 10790 | { |
| 10791 | /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */ |
| 10792 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); |
| 10793 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10794 | record_buf[2] = ARM_PS_REGNUM; |
| 10795 | arm_insn_r->reg_rec_count = 3; |
| 10796 | } |
| 10797 | } |
| 10798 | |
| 10799 | opcode1 = bits (arm_insn_r->arm_insn, 26, 27); |
| 10800 | opcode2 = bits (arm_insn_r->arm_insn, 23, 24); |
| 10801 | insn_op1 = bits (arm_insn_r->arm_insn, 21, 22); |
| 10802 | |
| 10803 | /* Handle control insn extension space. */ |
| 10804 | |
| 10805 | if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20) |
| 10806 | && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r)) |
| 10807 | { |
| 10808 | if (!bit (arm_insn_r->arm_insn,25)) |
| 10809 | { |
| 10810 | if (!bits (arm_insn_r->arm_insn, 4, 7)) |
| 10811 | { |
| 10812 | if ((0 == insn_op1) || (2 == insn_op1)) |
| 10813 | { |
| 10814 | /* MRS. */ |
| 10815 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10816 | arm_insn_r->reg_rec_count = 1; |
| 10817 | } |
| 10818 | else if (1 == insn_op1) |
| 10819 | { |
| 10820 | /* CSPR is going to be changed. */ |
| 10821 | record_buf[0] = ARM_PS_REGNUM; |
| 10822 | arm_insn_r->reg_rec_count = 1; |
| 10823 | } |
| 10824 | else if (3 == insn_op1) |
| 10825 | { |
| 10826 | /* SPSR is going to be changed. */ |
| 10827 | /* We need to get SPSR value, which is yet to be done. */ |
| 10828 | printf_unfiltered (_("Process record does not support " |
| 10829 | "instruction 0x%0x at address %s.\n"), |
| 10830 | arm_insn_r->arm_insn, |
| 10831 | paddress (arm_insn_r->gdbarch, |
| 10832 | arm_insn_r->this_addr)); |
| 10833 | return -1; |
| 10834 | } |
| 10835 | } |
| 10836 | else if (1 == bits (arm_insn_r->arm_insn, 4, 7)) |
| 10837 | { |
| 10838 | if (1 == insn_op1) |
| 10839 | { |
| 10840 | /* BX. */ |
| 10841 | record_buf[0] = ARM_PS_REGNUM; |
| 10842 | arm_insn_r->reg_rec_count = 1; |
| 10843 | } |
| 10844 | else if (3 == insn_op1) |
| 10845 | { |
| 10846 | /* CLZ. */ |
| 10847 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10848 | arm_insn_r->reg_rec_count = 1; |
| 10849 | } |
| 10850 | } |
| 10851 | else if (3 == bits (arm_insn_r->arm_insn, 4, 7)) |
| 10852 | { |
| 10853 | /* BLX. */ |
| 10854 | record_buf[0] = ARM_PS_REGNUM; |
| 10855 | record_buf[1] = ARM_LR_REGNUM; |
| 10856 | arm_insn_r->reg_rec_count = 2; |
| 10857 | } |
| 10858 | else if (5 == bits (arm_insn_r->arm_insn, 4, 7)) |
| 10859 | { |
| 10860 | /* QADD, QSUB, QDADD, QDSUB */ |
| 10861 | record_buf[0] = ARM_PS_REGNUM; |
| 10862 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10863 | arm_insn_r->reg_rec_count = 2; |
| 10864 | } |
| 10865 | else if (7 == bits (arm_insn_r->arm_insn, 4, 7)) |
| 10866 | { |
| 10867 | /* BKPT. */ |
| 10868 | record_buf[0] = ARM_PS_REGNUM; |
| 10869 | record_buf[1] = ARM_LR_REGNUM; |
| 10870 | arm_insn_r->reg_rec_count = 2; |
| 10871 | |
| 10872 | /* Save SPSR also;how? */ |
| 10873 | printf_unfiltered (_("Process record does not support " |
| 10874 | "instruction 0x%0x at address %s.\n"), |
| 10875 | arm_insn_r->arm_insn, |
| 10876 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); |
| 10877 | return -1; |
| 10878 | } |
| 10879 | else if(8 == bits (arm_insn_r->arm_insn, 4, 7) |
| 10880 | || 10 == bits (arm_insn_r->arm_insn, 4, 7) |
| 10881 | || 12 == bits (arm_insn_r->arm_insn, 4, 7) |
| 10882 | || 14 == bits (arm_insn_r->arm_insn, 4, 7) |
| 10883 | ) |
| 10884 | { |
| 10885 | if (0 == insn_op1 || 1 == insn_op1) |
| 10886 | { |
| 10887 | /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */ |
| 10888 | /* We dont do optimization for SMULW<y> where we |
| 10889 | need only Rd. */ |
| 10890 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10891 | record_buf[1] = ARM_PS_REGNUM; |
| 10892 | arm_insn_r->reg_rec_count = 2; |
| 10893 | } |
| 10894 | else if (2 == insn_op1) |
| 10895 | { |
| 10896 | /* SMLAL<x><y>. */ |
| 10897 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10898 | record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19); |
| 10899 | arm_insn_r->reg_rec_count = 2; |
| 10900 | } |
| 10901 | else if (3 == insn_op1) |
| 10902 | { |
| 10903 | /* SMUL<x><y>. */ |
| 10904 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10905 | arm_insn_r->reg_rec_count = 1; |
| 10906 | } |
| 10907 | } |
| 10908 | } |
| 10909 | else |
| 10910 | { |
| 10911 | /* MSR : immediate form. */ |
| 10912 | if (1 == insn_op1) |
| 10913 | { |
| 10914 | /* CSPR is going to be changed. */ |
| 10915 | record_buf[0] = ARM_PS_REGNUM; |
| 10916 | arm_insn_r->reg_rec_count = 1; |
| 10917 | } |
| 10918 | else if (3 == insn_op1) |
| 10919 | { |
| 10920 | /* SPSR is going to be changed. */ |
| 10921 | /* we need to get SPSR value, which is yet to be done */ |
| 10922 | printf_unfiltered (_("Process record does not support " |
| 10923 | "instruction 0x%0x at address %s.\n"), |
| 10924 | arm_insn_r->arm_insn, |
| 10925 | paddress (arm_insn_r->gdbarch, |
| 10926 | arm_insn_r->this_addr)); |
| 10927 | return -1; |
| 10928 | } |
| 10929 | } |
| 10930 | } |
| 10931 | |
| 10932 | opcode1 = bits (arm_insn_r->arm_insn, 25, 27); |
| 10933 | opcode2 = bits (arm_insn_r->arm_insn, 20, 24); |
| 10934 | insn_op1 = bits (arm_insn_r->arm_insn, 5, 6); |
| 10935 | |
| 10936 | /* Handle load/store insn extension space. */ |
| 10937 | |
| 10938 | if (!opcode1 && bit (arm_insn_r->arm_insn, 7) |
| 10939 | && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond |
| 10940 | && !INSN_RECORDED(arm_insn_r)) |
| 10941 | { |
| 10942 | /* SWP/SWPB. */ |
| 10943 | if (0 == insn_op1) |
| 10944 | { |
| 10945 | /* These insn, changes register and memory as well. */ |
| 10946 | /* SWP or SWPB insn. */ |
| 10947 | /* Get memory address given by Rn. */ |
| 10948 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 10949 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); |
| 10950 | /* SWP insn ?, swaps word. */ |
| 10951 | if (8 == arm_insn_r->opcode) |
| 10952 | { |
| 10953 | record_buf_mem[0] = 4; |
| 10954 | } |
| 10955 | else |
| 10956 | { |
| 10957 | /* SWPB insn, swaps only byte. */ |
| 10958 | record_buf_mem[0] = 1; |
| 10959 | } |
| 10960 | record_buf_mem[1] = u_regval; |
| 10961 | arm_insn_r->mem_rec_count = 1; |
| 10962 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10963 | arm_insn_r->reg_rec_count = 1; |
| 10964 | } |
| 10965 | else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) |
| 10966 | { |
| 10967 | /* STRH. */ |
| 10968 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], |
| 10969 | ARM_RECORD_STRH); |
| 10970 | } |
| 10971 | else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) |
| 10972 | { |
| 10973 | /* LDRD. */ |
| 10974 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10975 | record_buf[1] = record_buf[0] + 1; |
| 10976 | arm_insn_r->reg_rec_count = 2; |
| 10977 | } |
| 10978 | else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20)) |
| 10979 | { |
| 10980 | /* STRD. */ |
| 10981 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], |
| 10982 | ARM_RECORD_STRD); |
| 10983 | } |
| 10984 | else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3) |
| 10985 | { |
| 10986 | /* LDRH, LDRSB, LDRSH. */ |
| 10987 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 10988 | arm_insn_r->reg_rec_count = 1; |
| 10989 | } |
| 10990 | |
| 10991 | } |
| 10992 | |
| 10993 | opcode1 = bits (arm_insn_r->arm_insn, 23, 27); |
| 10994 | if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21) |
| 10995 | && !INSN_RECORDED(arm_insn_r)) |
| 10996 | { |
| 10997 | ret = -1; |
| 10998 | /* Handle coprocessor insn extension space. */ |
| 10999 | } |
| 11000 | |
| 11001 | /* To be done for ARMv5 and later; as of now we return -1. */ |
| 11002 | if (-1 == ret) |
| 11003 | printf_unfiltered (_("Process record does not support instruction x%0x " |
| 11004 | "at address %s.\n"),arm_insn_r->arm_insn, |
| 11005 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); |
| 11006 | |
| 11007 | |
| 11008 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11009 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); |
| 11010 | |
| 11011 | return ret; |
| 11012 | } |
| 11013 | |
| 11014 | /* Handling opcode 000 insns. */ |
| 11015 | |
| 11016 | static int |
| 11017 | arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r) |
| 11018 | { |
| 11019 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 11020 | uint32_t record_buf[8], record_buf_mem[8]; |
| 11021 | ULONGEST u_regval[2] = {0}; |
| 11022 | |
| 11023 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; |
| 11024 | uint32_t immed_high = 0, immed_low = 0, offset_8 = 0, tgt_mem_addr = 0; |
| 11025 | uint32_t opcode1 = 0; |
| 11026 | |
| 11027 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); |
| 11028 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); |
| 11029 | opcode1 = bits (arm_insn_r->arm_insn, 20, 24); |
| 11030 | |
| 11031 | /* Data processing insn /multiply insn. */ |
| 11032 | if (9 == arm_insn_r->decode |
| 11033 | && ((4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) |
| 11034 | || (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode))) |
| 11035 | { |
| 11036 | /* Handle multiply instructions. */ |
| 11037 | /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */ |
| 11038 | if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode) |
| 11039 | { |
| 11040 | /* Handle MLA and MUL. */ |
| 11041 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); |
| 11042 | record_buf[1] = ARM_PS_REGNUM; |
| 11043 | arm_insn_r->reg_rec_count = 2; |
| 11044 | } |
| 11045 | else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode) |
| 11046 | { |
| 11047 | /* Handle SMLAL, SMULL, UMLAL, UMULL. */ |
| 11048 | record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19); |
| 11049 | record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11050 | record_buf[2] = ARM_PS_REGNUM; |
| 11051 | arm_insn_r->reg_rec_count = 3; |
| 11052 | } |
| 11053 | } |
| 11054 | else if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) |
| 11055 | && (11 == arm_insn_r->decode || 13 == arm_insn_r->decode)) |
| 11056 | { |
| 11057 | /* Handle misc load insns, as 20th bit (L = 1). */ |
| 11058 | /* LDR insn has a capability to do branching, if |
| 11059 | MOV LR, PC is precceded by LDR insn having Rn as R15 |
| 11060 | in that case, it emulates branch and link insn, and hence we |
| 11061 | need to save CSPR and PC as well. I am not sure this is right |
| 11062 | place; as opcode = 010 LDR insn make this happen, if R15 was |
| 11063 | used. */ |
| 11064 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); |
| 11065 | if (15 != reg_dest) |
| 11066 | { |
| 11067 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11068 | arm_insn_r->reg_rec_count = 1; |
| 11069 | } |
| 11070 | else |
| 11071 | { |
| 11072 | record_buf[0] = reg_dest; |
| 11073 | record_buf[1] = ARM_PS_REGNUM; |
| 11074 | arm_insn_r->reg_rec_count = 2; |
| 11075 | } |
| 11076 | } |
| 11077 | else if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) |
| 11078 | && sbo_sbz (arm_insn_r->arm_insn, 5, 12, 0) |
| 11079 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) |
| 11080 | && 2 == bits (arm_insn_r->arm_insn, 20, 21)) |
| 11081 | { |
| 11082 | /* Handle MSR insn. */ |
| 11083 | if (9 == arm_insn_r->opcode) |
| 11084 | { |
| 11085 | /* CSPR is going to be changed. */ |
| 11086 | record_buf[0] = ARM_PS_REGNUM; |
| 11087 | arm_insn_r->reg_rec_count = 1; |
| 11088 | } |
| 11089 | else |
| 11090 | { |
| 11091 | /* SPSR is going to be changed. */ |
| 11092 | /* How to read SPSR value? */ |
| 11093 | printf_unfiltered (_("Process record does not support instruction " |
| 11094 | "0x%0x at address %s.\n"), |
| 11095 | arm_insn_r->arm_insn, |
| 11096 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); |
| 11097 | return -1; |
| 11098 | } |
| 11099 | } |
| 11100 | else if (9 == arm_insn_r->decode |
| 11101 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) |
| 11102 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) |
| 11103 | { |
| 11104 | /* Handling SWP, SWPB. */ |
| 11105 | /* These insn, changes register and memory as well. */ |
| 11106 | /* SWP or SWPB insn. */ |
| 11107 | |
| 11108 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 11109 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 11110 | /* SWP insn ?, swaps word. */ |
| 11111 | if (8 == arm_insn_r->opcode) |
| 11112 | { |
| 11113 | record_buf_mem[0] = 4; |
| 11114 | } |
| 11115 | else |
| 11116 | { |
| 11117 | /* SWPB insn, swaps only byte. */ |
| 11118 | record_buf_mem[0] = 1; |
| 11119 | } |
| 11120 | record_buf_mem[1] = u_regval[0]; |
| 11121 | arm_insn_r->mem_rec_count = 1; |
| 11122 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11123 | arm_insn_r->reg_rec_count = 1; |
| 11124 | } |
| 11125 | else if (3 == arm_insn_r->decode && 0x12 == opcode1 |
| 11126 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) |
| 11127 | { |
| 11128 | /* Handle BLX, branch and link/exchange. */ |
| 11129 | if (9 == arm_insn_r->opcode) |
| 11130 | { |
| 11131 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm, |
| 11132 | and R14 stores the return address. */ |
| 11133 | record_buf[0] = ARM_PS_REGNUM; |
| 11134 | record_buf[1] = ARM_LR_REGNUM; |
| 11135 | arm_insn_r->reg_rec_count = 2; |
| 11136 | } |
| 11137 | } |
| 11138 | else if (7 == arm_insn_r->decode && 0x12 == opcode1) |
| 11139 | { |
| 11140 | /* Handle enhanced software breakpoint insn, BKPT. */ |
| 11141 | /* CPSR is changed to be executed in ARM state, disabling normal |
| 11142 | interrupts, entering abort mode. */ |
| 11143 | /* According to high vector configuration PC is set. */ |
| 11144 | /* user hit breakpoint and type reverse, in |
| 11145 | that case, we need to go back with previous CPSR and |
| 11146 | Program Counter. */ |
| 11147 | record_buf[0] = ARM_PS_REGNUM; |
| 11148 | record_buf[1] = ARM_LR_REGNUM; |
| 11149 | arm_insn_r->reg_rec_count = 2; |
| 11150 | |
| 11151 | /* Save SPSR also; how? */ |
| 11152 | printf_unfiltered (_("Process record does not support instruction " |
| 11153 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, |
| 11154 | paddress (arm_insn_r->gdbarch, |
| 11155 | arm_insn_r->this_addr)); |
| 11156 | return -1; |
| 11157 | } |
| 11158 | else if (11 == arm_insn_r->decode |
| 11159 | && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) |
| 11160 | { |
| 11161 | /* Handle enhanced store insns and DSP insns (e.g. LDRD). */ |
| 11162 | |
| 11163 | /* Handle str(x) insn */ |
| 11164 | arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0], |
| 11165 | ARM_RECORD_STRH); |
| 11166 | } |
| 11167 | else if (1 == arm_insn_r->decode && 0x12 == opcode1 |
| 11168 | && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1)) |
| 11169 | { |
| 11170 | /* Handle BX, branch and link/exchange. */ |
| 11171 | /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */ |
| 11172 | record_buf[0] = ARM_PS_REGNUM; |
| 11173 | arm_insn_r->reg_rec_count = 1; |
| 11174 | } |
| 11175 | else if (1 == arm_insn_r->decode && 0x16 == opcode1 |
| 11176 | && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1) |
| 11177 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)) |
| 11178 | { |
| 11179 | /* Count leading zeros: CLZ. */ |
| 11180 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11181 | arm_insn_r->reg_rec_count = 1; |
| 11182 | } |
| 11183 | else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM) |
| 11184 | && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode) |
| 11185 | && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1) |
| 11186 | && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0) |
| 11187 | ) |
| 11188 | { |
| 11189 | /* Handle MRS insn. */ |
| 11190 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11191 | arm_insn_r->reg_rec_count = 1; |
| 11192 | } |
| 11193 | else if (arm_insn_r->opcode <= 15) |
| 11194 | { |
| 11195 | /* Normal data processing insns. */ |
| 11196 | /* Out of 11 shifter operands mode, all the insn modifies destination |
| 11197 | register, which is specified by 13-16 decode. */ |
| 11198 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11199 | record_buf[1] = ARM_PS_REGNUM; |
| 11200 | arm_insn_r->reg_rec_count = 2; |
| 11201 | } |
| 11202 | else |
| 11203 | { |
| 11204 | return -1; |
| 11205 | } |
| 11206 | |
| 11207 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11208 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); |
| 11209 | return 0; |
| 11210 | } |
| 11211 | |
| 11212 | /* Handling opcode 001 insns. */ |
| 11213 | |
| 11214 | static int |
| 11215 | arm_record_data_proc_imm (insn_decode_record *arm_insn_r) |
| 11216 | { |
| 11217 | uint32_t record_buf[8], record_buf_mem[8]; |
| 11218 | |
| 11219 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); |
| 11220 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); |
| 11221 | |
| 11222 | if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode) |
| 11223 | && 2 == bits (arm_insn_r->arm_insn, 20, 21) |
| 11224 | && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1) |
| 11225 | ) |
| 11226 | { |
| 11227 | /* Handle MSR insn. */ |
| 11228 | if (9 == arm_insn_r->opcode) |
| 11229 | { |
| 11230 | /* CSPR is going to be changed. */ |
| 11231 | record_buf[0] = ARM_PS_REGNUM; |
| 11232 | arm_insn_r->reg_rec_count = 1; |
| 11233 | } |
| 11234 | else |
| 11235 | { |
| 11236 | /* SPSR is going to be changed. */ |
| 11237 | } |
| 11238 | } |
| 11239 | else if (arm_insn_r->opcode <= 15) |
| 11240 | { |
| 11241 | /* Normal data processing insns. */ |
| 11242 | /* Out of 11 shifter operands mode, all the insn modifies destination |
| 11243 | register, which is specified by 13-16 decode. */ |
| 11244 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11245 | record_buf[1] = ARM_PS_REGNUM; |
| 11246 | arm_insn_r->reg_rec_count = 2; |
| 11247 | } |
| 11248 | else |
| 11249 | { |
| 11250 | return -1; |
| 11251 | } |
| 11252 | |
| 11253 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11254 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); |
| 11255 | return 0; |
| 11256 | } |
| 11257 | |
| 11258 | /* Handling opcode 010 insns. */ |
| 11259 | |
| 11260 | static int |
| 11261 | arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r) |
| 11262 | { |
| 11263 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 11264 | |
| 11265 | uint32_t reg_src1 = 0 , reg_dest = 0; |
| 11266 | uint32_t offset_12 = 0, tgt_mem_addr = 0; |
| 11267 | uint32_t record_buf[8], record_buf_mem[8]; |
| 11268 | |
| 11269 | ULONGEST u_regval = 0; |
| 11270 | |
| 11271 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); |
| 11272 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); |
| 11273 | |
| 11274 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) |
| 11275 | { |
| 11276 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); |
| 11277 | /* LDR insn has a capability to do branching, if |
| 11278 | MOV LR, PC is precedded by LDR insn having Rn as R15 |
| 11279 | in that case, it emulates branch and link insn, and hence we |
| 11280 | need to save CSPR and PC as well. */ |
| 11281 | if (ARM_PC_REGNUM != reg_dest) |
| 11282 | { |
| 11283 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11284 | arm_insn_r->reg_rec_count = 1; |
| 11285 | } |
| 11286 | else |
| 11287 | { |
| 11288 | record_buf[0] = reg_dest; |
| 11289 | record_buf[1] = ARM_PS_REGNUM; |
| 11290 | arm_insn_r->reg_rec_count = 2; |
| 11291 | } |
| 11292 | } |
| 11293 | else |
| 11294 | { |
| 11295 | /* Store, immediate offset, immediate pre-indexed, |
| 11296 | immediate post-indexed. */ |
| 11297 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 11298 | offset_12 = bits (arm_insn_r->arm_insn, 0, 11); |
| 11299 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); |
| 11300 | /* U == 1 */ |
| 11301 | if (bit (arm_insn_r->arm_insn, 23)) |
| 11302 | { |
| 11303 | tgt_mem_addr = u_regval + offset_12; |
| 11304 | } |
| 11305 | else |
| 11306 | { |
| 11307 | tgt_mem_addr = u_regval - offset_12; |
| 11308 | } |
| 11309 | |
| 11310 | switch (arm_insn_r->opcode) |
| 11311 | { |
| 11312 | /* STR. */ |
| 11313 | case 8: |
| 11314 | case 12: |
| 11315 | /* STR. */ |
| 11316 | case 9: |
| 11317 | case 13: |
| 11318 | /* STRT. */ |
| 11319 | case 1: |
| 11320 | case 5: |
| 11321 | /* STR. */ |
| 11322 | case 4: |
| 11323 | case 0: |
| 11324 | record_buf_mem[0] = 4; |
| 11325 | break; |
| 11326 | |
| 11327 | /* STRB. */ |
| 11328 | case 10: |
| 11329 | case 14: |
| 11330 | /* STRB. */ |
| 11331 | case 11: |
| 11332 | case 15: |
| 11333 | /* STRBT. */ |
| 11334 | case 3: |
| 11335 | case 7: |
| 11336 | /* STRB. */ |
| 11337 | case 2: |
| 11338 | case 6: |
| 11339 | record_buf_mem[0] = 1; |
| 11340 | break; |
| 11341 | |
| 11342 | default: |
| 11343 | gdb_assert_not_reached ("no decoding pattern found"); |
| 11344 | break; |
| 11345 | } |
| 11346 | record_buf_mem[1] = tgt_mem_addr; |
| 11347 | arm_insn_r->mem_rec_count = 1; |
| 11348 | |
| 11349 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode |
| 11350 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode |
| 11351 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode |
| 11352 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode |
| 11353 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode |
| 11354 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode |
| 11355 | ) |
| 11356 | { |
| 11357 | /* We are handling pre-indexed mode; post-indexed mode; |
| 11358 | where Rn is going to be changed. */ |
| 11359 | record_buf[0] = reg_src1; |
| 11360 | arm_insn_r->reg_rec_count = 1; |
| 11361 | } |
| 11362 | } |
| 11363 | |
| 11364 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11365 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); |
| 11366 | return 0; |
| 11367 | } |
| 11368 | |
| 11369 | /* Handling opcode 011 insns. */ |
| 11370 | |
| 11371 | static int |
| 11372 | arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r) |
| 11373 | { |
| 11374 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 11375 | |
| 11376 | uint32_t shift_imm = 0; |
| 11377 | uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0; |
| 11378 | uint32_t offset_12 = 0, tgt_mem_addr = 0; |
| 11379 | uint32_t record_buf[8], record_buf_mem[8]; |
| 11380 | |
| 11381 | LONGEST s_word; |
| 11382 | ULONGEST u_regval[2]; |
| 11383 | |
| 11384 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24); |
| 11385 | arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7); |
| 11386 | |
| 11387 | /* Handle enhanced store insns and LDRD DSP insn, |
| 11388 | order begins according to addressing modes for store insns |
| 11389 | STRH insn. */ |
| 11390 | |
| 11391 | /* LDR or STR? */ |
| 11392 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) |
| 11393 | { |
| 11394 | reg_dest = bits (arm_insn_r->arm_insn, 12, 15); |
| 11395 | /* LDR insn has a capability to do branching, if |
| 11396 | MOV LR, PC is precedded by LDR insn having Rn as R15 |
| 11397 | in that case, it emulates branch and link insn, and hence we |
| 11398 | need to save CSPR and PC as well. */ |
| 11399 | if (15 != reg_dest) |
| 11400 | { |
| 11401 | record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15); |
| 11402 | arm_insn_r->reg_rec_count = 1; |
| 11403 | } |
| 11404 | else |
| 11405 | { |
| 11406 | record_buf[0] = reg_dest; |
| 11407 | record_buf[1] = ARM_PS_REGNUM; |
| 11408 | arm_insn_r->reg_rec_count = 2; |
| 11409 | } |
| 11410 | } |
| 11411 | else |
| 11412 | { |
| 11413 | if (! bits (arm_insn_r->arm_insn, 4, 11)) |
| 11414 | { |
| 11415 | /* Store insn, register offset and register pre-indexed, |
| 11416 | register post-indexed. */ |
| 11417 | /* Get Rm. */ |
| 11418 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); |
| 11419 | /* Get Rn. */ |
| 11420 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); |
| 11421 | regcache_raw_read_unsigned (reg_cache, reg_src1 |
| 11422 | , &u_regval[0]); |
| 11423 | regcache_raw_read_unsigned (reg_cache, reg_src2 |
| 11424 | , &u_regval[1]); |
| 11425 | if (15 == reg_src2) |
| 11426 | { |
| 11427 | /* If R15 was used as Rn, hence current PC+8. */ |
| 11428 | /* Pre-indexed mode doesnt reach here ; illegal insn. */ |
| 11429 | u_regval[0] = u_regval[0] + 8; |
| 11430 | } |
| 11431 | /* Calculate target store address, Rn +/- Rm, register offset. */ |
| 11432 | /* U == 1. */ |
| 11433 | if (bit (arm_insn_r->arm_insn, 23)) |
| 11434 | { |
| 11435 | tgt_mem_addr = u_regval[0] + u_regval[1]; |
| 11436 | } |
| 11437 | else |
| 11438 | { |
| 11439 | tgt_mem_addr = u_regval[1] - u_regval[0]; |
| 11440 | } |
| 11441 | |
| 11442 | switch (arm_insn_r->opcode) |
| 11443 | { |
| 11444 | /* STR. */ |
| 11445 | case 8: |
| 11446 | case 12: |
| 11447 | /* STR. */ |
| 11448 | case 9: |
| 11449 | case 13: |
| 11450 | /* STRT. */ |
| 11451 | case 1: |
| 11452 | case 5: |
| 11453 | /* STR. */ |
| 11454 | case 0: |
| 11455 | case 4: |
| 11456 | record_buf_mem[0] = 4; |
| 11457 | break; |
| 11458 | |
| 11459 | /* STRB. */ |
| 11460 | case 10: |
| 11461 | case 14: |
| 11462 | /* STRB. */ |
| 11463 | case 11: |
| 11464 | case 15: |
| 11465 | /* STRBT. */ |
| 11466 | case 3: |
| 11467 | case 7: |
| 11468 | /* STRB. */ |
| 11469 | case 2: |
| 11470 | case 6: |
| 11471 | record_buf_mem[0] = 1; |
| 11472 | break; |
| 11473 | |
| 11474 | default: |
| 11475 | gdb_assert_not_reached ("no decoding pattern found"); |
| 11476 | break; |
| 11477 | } |
| 11478 | record_buf_mem[1] = tgt_mem_addr; |
| 11479 | arm_insn_r->mem_rec_count = 1; |
| 11480 | |
| 11481 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode |
| 11482 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode |
| 11483 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode |
| 11484 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode |
| 11485 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode |
| 11486 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode |
| 11487 | ) |
| 11488 | { |
| 11489 | /* Rn is going to be changed in pre-indexed mode and |
| 11490 | post-indexed mode as well. */ |
| 11491 | record_buf[0] = reg_src2; |
| 11492 | arm_insn_r->reg_rec_count = 1; |
| 11493 | } |
| 11494 | } |
| 11495 | else |
| 11496 | { |
| 11497 | /* Store insn, scaled register offset; scaled pre-indexed. */ |
| 11498 | offset_12 = bits (arm_insn_r->arm_insn, 5, 6); |
| 11499 | /* Get Rm. */ |
| 11500 | reg_src1 = bits (arm_insn_r->arm_insn, 0, 3); |
| 11501 | /* Get Rn. */ |
| 11502 | reg_src2 = bits (arm_insn_r->arm_insn, 16, 19); |
| 11503 | /* Get shift_imm. */ |
| 11504 | shift_imm = bits (arm_insn_r->arm_insn, 7, 11); |
| 11505 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 11506 | regcache_raw_read_signed (reg_cache, reg_src1, &s_word); |
| 11507 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); |
| 11508 | /* Offset_12 used as shift. */ |
| 11509 | switch (offset_12) |
| 11510 | { |
| 11511 | case 0: |
| 11512 | /* Offset_12 used as index. */ |
| 11513 | offset_12 = u_regval[0] << shift_imm; |
| 11514 | break; |
| 11515 | |
| 11516 | case 1: |
| 11517 | offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm; |
| 11518 | break; |
| 11519 | |
| 11520 | case 2: |
| 11521 | if (!shift_imm) |
| 11522 | { |
| 11523 | if (bit (u_regval[0], 31)) |
| 11524 | { |
| 11525 | offset_12 = 0xFFFFFFFF; |
| 11526 | } |
| 11527 | else |
| 11528 | { |
| 11529 | offset_12 = 0; |
| 11530 | } |
| 11531 | } |
| 11532 | else |
| 11533 | { |
| 11534 | /* This is arithmetic shift. */ |
| 11535 | offset_12 = s_word >> shift_imm; |
| 11536 | } |
| 11537 | break; |
| 11538 | |
| 11539 | case 3: |
| 11540 | if (!shift_imm) |
| 11541 | { |
| 11542 | regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM, |
| 11543 | &u_regval[1]); |
| 11544 | /* Get C flag value and shift it by 31. */ |
| 11545 | offset_12 = (((bit (u_regval[1], 29)) << 31) \ |
| 11546 | | (u_regval[0]) >> 1); |
| 11547 | } |
| 11548 | else |
| 11549 | { |
| 11550 | offset_12 = (u_regval[0] >> shift_imm) \ |
| 11551 | | (u_regval[0] << |
| 11552 | (sizeof(uint32_t) - shift_imm)); |
| 11553 | } |
| 11554 | break; |
| 11555 | |
| 11556 | default: |
| 11557 | gdb_assert_not_reached ("no decoding pattern found"); |
| 11558 | break; |
| 11559 | } |
| 11560 | |
| 11561 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); |
| 11562 | /* bit U set. */ |
| 11563 | if (bit (arm_insn_r->arm_insn, 23)) |
| 11564 | { |
| 11565 | tgt_mem_addr = u_regval[1] + offset_12; |
| 11566 | } |
| 11567 | else |
| 11568 | { |
| 11569 | tgt_mem_addr = u_regval[1] - offset_12; |
| 11570 | } |
| 11571 | |
| 11572 | switch (arm_insn_r->opcode) |
| 11573 | { |
| 11574 | /* STR. */ |
| 11575 | case 8: |
| 11576 | case 12: |
| 11577 | /* STR. */ |
| 11578 | case 9: |
| 11579 | case 13: |
| 11580 | /* STRT. */ |
| 11581 | case 1: |
| 11582 | case 5: |
| 11583 | /* STR. */ |
| 11584 | case 0: |
| 11585 | case 4: |
| 11586 | record_buf_mem[0] = 4; |
| 11587 | break; |
| 11588 | |
| 11589 | /* STRB. */ |
| 11590 | case 10: |
| 11591 | case 14: |
| 11592 | /* STRB. */ |
| 11593 | case 11: |
| 11594 | case 15: |
| 11595 | /* STRBT. */ |
| 11596 | case 3: |
| 11597 | case 7: |
| 11598 | /* STRB. */ |
| 11599 | case 2: |
| 11600 | case 6: |
| 11601 | record_buf_mem[0] = 1; |
| 11602 | break; |
| 11603 | |
| 11604 | default: |
| 11605 | gdb_assert_not_reached ("no decoding pattern found"); |
| 11606 | break; |
| 11607 | } |
| 11608 | record_buf_mem[1] = tgt_mem_addr; |
| 11609 | arm_insn_r->mem_rec_count = 1; |
| 11610 | |
| 11611 | if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode |
| 11612 | || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode |
| 11613 | || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode |
| 11614 | || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode |
| 11615 | || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode |
| 11616 | || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode |
| 11617 | ) |
| 11618 | { |
| 11619 | /* Rn is going to be changed in register scaled pre-indexed |
| 11620 | mode,and scaled post indexed mode. */ |
| 11621 | record_buf[0] = reg_src2; |
| 11622 | arm_insn_r->reg_rec_count = 1; |
| 11623 | } |
| 11624 | } |
| 11625 | } |
| 11626 | |
| 11627 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11628 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); |
| 11629 | return 0; |
| 11630 | } |
| 11631 | |
| 11632 | /* Handling opcode 100 insns. */ |
| 11633 | |
| 11634 | static int |
| 11635 | arm_record_ld_st_multiple (insn_decode_record *arm_insn_r) |
| 11636 | { |
| 11637 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 11638 | |
| 11639 | uint32_t register_list[16] = {0}, register_count = 0, register_bits = 0; |
| 11640 | uint32_t reg_src1 = 0, addr_mode = 0, no_of_regs = 0; |
| 11641 | uint32_t start_address = 0, index = 0; |
| 11642 | uint32_t record_buf[24], record_buf_mem[48]; |
| 11643 | |
| 11644 | ULONGEST u_regval[2] = {0}; |
| 11645 | |
| 11646 | /* This mode is exclusively for load and store multiple. */ |
| 11647 | /* Handle incremenrt after/before and decrment after.before mode; |
| 11648 | Rn is changing depending on W bit, but as of now we store Rn too |
| 11649 | without optimization. */ |
| 11650 | |
| 11651 | if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)) |
| 11652 | { |
| 11653 | /* LDM (1,2,3) where LDM (3) changes CPSR too. */ |
| 11654 | |
| 11655 | if (bit (arm_insn_r->arm_insn, 20) && !bit (arm_insn_r->arm_insn, 22)) |
| 11656 | { |
| 11657 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); |
| 11658 | no_of_regs = 15; |
| 11659 | } |
| 11660 | else |
| 11661 | { |
| 11662 | register_bits = bits (arm_insn_r->arm_insn, 0, 14); |
| 11663 | no_of_regs = 14; |
| 11664 | } |
| 11665 | /* Get Rn. */ |
| 11666 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 11667 | while (register_bits) |
| 11668 | { |
| 11669 | if (register_bits & 0x00000001) |
| 11670 | register_list[register_count++] = 1; |
| 11671 | register_bits = register_bits >> 1; |
| 11672 | } |
| 11673 | |
| 11674 | /* Extra space for Base Register and CPSR; wihtout optimization. */ |
| 11675 | record_buf[register_count] = reg_src1; |
| 11676 | record_buf[register_count + 1] = ARM_PS_REGNUM; |
| 11677 | arm_insn_r->reg_rec_count = register_count + 2; |
| 11678 | |
| 11679 | for (register_count = 0; register_count < no_of_regs; register_count++) |
| 11680 | { |
| 11681 | if (register_list[register_count]) |
| 11682 | { |
| 11683 | /* Register_count gives total no of registers |
| 11684 | and dually working as reg number. */ |
| 11685 | record_buf[index] = register_count; |
| 11686 | index++; |
| 11687 | } |
| 11688 | } |
| 11689 | |
| 11690 | } |
| 11691 | else |
| 11692 | { |
| 11693 | /* It handles both STM(1) and STM(2). */ |
| 11694 | addr_mode = bits (arm_insn_r->arm_insn, 23, 24); |
| 11695 | |
| 11696 | register_bits = bits (arm_insn_r->arm_insn, 0, 15); |
| 11697 | /* Get Rn. */ |
| 11698 | reg_src1 = bits (arm_insn_r->arm_insn, 16, 19); |
| 11699 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 11700 | while (register_bits) |
| 11701 | { |
| 11702 | if (register_bits & 0x00000001) |
| 11703 | register_count++; |
| 11704 | register_bits = register_bits >> 1; |
| 11705 | } |
| 11706 | |
| 11707 | switch (addr_mode) |
| 11708 | { |
| 11709 | /* Decrement after. */ |
| 11710 | case 0: |
| 11711 | start_address = (u_regval[0]) - (register_count * 4) + 4; |
| 11712 | arm_insn_r->mem_rec_count = register_count; |
| 11713 | while (register_count) |
| 11714 | { |
| 11715 | record_buf_mem[(register_count * 2) - 1] = start_address; |
| 11716 | record_buf_mem[(register_count * 2) - 2] = 4; |
| 11717 | start_address = start_address + 4; |
| 11718 | register_count--; |
| 11719 | } |
| 11720 | break; |
| 11721 | |
| 11722 | /* Increment after. */ |
| 11723 | case 1: |
| 11724 | start_address = u_regval[0]; |
| 11725 | arm_insn_r->mem_rec_count = register_count; |
| 11726 | while (register_count) |
| 11727 | { |
| 11728 | record_buf_mem[(register_count * 2) - 1] = start_address; |
| 11729 | record_buf_mem[(register_count * 2) - 2] = 4; |
| 11730 | start_address = start_address + 4; |
| 11731 | register_count--; |
| 11732 | } |
| 11733 | break; |
| 11734 | |
| 11735 | /* Decrement before. */ |
| 11736 | case 2: |
| 11737 | |
| 11738 | start_address = (u_regval[0]) - (register_count * 4); |
| 11739 | arm_insn_r->mem_rec_count = register_count; |
| 11740 | while (register_count) |
| 11741 | { |
| 11742 | record_buf_mem[(register_count * 2) - 1] = start_address; |
| 11743 | record_buf_mem[(register_count * 2) - 2] = 4; |
| 11744 | start_address = start_address + 4; |
| 11745 | register_count--; |
| 11746 | } |
| 11747 | break; |
| 11748 | |
| 11749 | /* Increment before. */ |
| 11750 | case 3: |
| 11751 | start_address = u_regval[0] + 4; |
| 11752 | arm_insn_r->mem_rec_count = register_count; |
| 11753 | while (register_count) |
| 11754 | { |
| 11755 | record_buf_mem[(register_count * 2) - 1] = start_address; |
| 11756 | record_buf_mem[(register_count * 2) - 2] = 4; |
| 11757 | start_address = start_address + 4; |
| 11758 | register_count--; |
| 11759 | } |
| 11760 | break; |
| 11761 | |
| 11762 | default: |
| 11763 | gdb_assert_not_reached ("no decoding pattern found"); |
| 11764 | break; |
| 11765 | } |
| 11766 | |
| 11767 | /* Base register also changes; based on condition and W bit. */ |
| 11768 | /* We save it anyway without optimization. */ |
| 11769 | record_buf[0] = reg_src1; |
| 11770 | arm_insn_r->reg_rec_count = 1; |
| 11771 | } |
| 11772 | |
| 11773 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11774 | MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count, record_buf_mem); |
| 11775 | return 0; |
| 11776 | } |
| 11777 | |
| 11778 | /* Handling opcode 101 insns. */ |
| 11779 | |
| 11780 | static int |
| 11781 | arm_record_b_bl (insn_decode_record *arm_insn_r) |
| 11782 | { |
| 11783 | uint32_t record_buf[8]; |
| 11784 | |
| 11785 | /* Handle B, BL, BLX(1) insns. */ |
| 11786 | /* B simply branches so we do nothing here. */ |
| 11787 | /* Note: BLX(1) doesnt fall here but instead it falls into |
| 11788 | extension space. */ |
| 11789 | if (bit (arm_insn_r->arm_insn, 24)) |
| 11790 | { |
| 11791 | record_buf[0] = ARM_LR_REGNUM; |
| 11792 | arm_insn_r->reg_rec_count = 1; |
| 11793 | } |
| 11794 | |
| 11795 | REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf); |
| 11796 | |
| 11797 | return 0; |
| 11798 | } |
| 11799 | |
| 11800 | /* Handling opcode 110 insns. */ |
| 11801 | |
| 11802 | static int |
| 11803 | arm_record_coproc (insn_decode_record *arm_insn_r) |
| 11804 | { |
| 11805 | printf_unfiltered (_("Process record does not support instruction " |
| 11806 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, |
| 11807 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); |
| 11808 | |
| 11809 | return -1; |
| 11810 | } |
| 11811 | |
| 11812 | /* Handling opcode 111 insns. */ |
| 11813 | |
| 11814 | static int |
| 11815 | arm_record_coproc_data_proc (insn_decode_record *arm_insn_r) |
| 11816 | { |
| 11817 | struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch); |
| 11818 | struct regcache *reg_cache = arm_insn_r->regcache; |
| 11819 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ |
| 11820 | |
| 11821 | /* Handle SWI insn; system call would be handled over here. */ |
| 11822 | |
| 11823 | arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27); |
| 11824 | if (15 == arm_insn_r->opcode) |
| 11825 | { |
| 11826 | /* Handle arm syscall insn. */ |
| 11827 | if (tdep->arm_swi_record != NULL) |
| 11828 | { |
| 11829 | ret = tdep->arm_swi_record(reg_cache); |
| 11830 | } |
| 11831 | else |
| 11832 | { |
| 11833 | printf_unfiltered (_("no syscall record support\n")); |
| 11834 | ret = -1; |
| 11835 | } |
| 11836 | } |
| 11837 | |
| 11838 | printf_unfiltered (_("Process record does not support instruction " |
| 11839 | "0x%0x at address %s.\n"),arm_insn_r->arm_insn, |
| 11840 | paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr)); |
| 11841 | return ret; |
| 11842 | } |
| 11843 | |
| 11844 | /* Handling opcode 000 insns. */ |
| 11845 | |
| 11846 | static int |
| 11847 | thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r) |
| 11848 | { |
| 11849 | uint32_t record_buf[8]; |
| 11850 | uint32_t reg_src1 = 0; |
| 11851 | |
| 11852 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); |
| 11853 | |
| 11854 | record_buf[0] = ARM_PS_REGNUM; |
| 11855 | record_buf[1] = reg_src1; |
| 11856 | thumb_insn_r->reg_rec_count = 2; |
| 11857 | |
| 11858 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 11859 | |
| 11860 | return 0; |
| 11861 | } |
| 11862 | |
| 11863 | |
| 11864 | /* Handling opcode 001 insns. */ |
| 11865 | |
| 11866 | static int |
| 11867 | thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r) |
| 11868 | { |
| 11869 | uint32_t record_buf[8]; |
| 11870 | uint32_t reg_src1 = 0; |
| 11871 | |
| 11872 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 11873 | |
| 11874 | record_buf[0] = ARM_PS_REGNUM; |
| 11875 | record_buf[1] = reg_src1; |
| 11876 | thumb_insn_r->reg_rec_count = 2; |
| 11877 | |
| 11878 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 11879 | |
| 11880 | return 0; |
| 11881 | } |
| 11882 | |
| 11883 | /* Handling opcode 010 insns. */ |
| 11884 | |
| 11885 | static int |
| 11886 | thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r) |
| 11887 | { |
| 11888 | struct regcache *reg_cache = thumb_insn_r->regcache; |
| 11889 | uint32_t record_buf[8], record_buf_mem[8]; |
| 11890 | |
| 11891 | uint32_t reg_src1 = 0, reg_src2 = 0; |
| 11892 | uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0; |
| 11893 | |
| 11894 | ULONGEST u_regval[2] = {0}; |
| 11895 | |
| 11896 | opcode1 = bits (thumb_insn_r->arm_insn, 10, 12); |
| 11897 | |
| 11898 | if (bit (thumb_insn_r->arm_insn, 12)) |
| 11899 | { |
| 11900 | /* Handle load/store register offset. */ |
| 11901 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 10); |
| 11902 | if (opcode2 >= 12 && opcode2 <= 15) |
| 11903 | { |
| 11904 | /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */ |
| 11905 | reg_src1 = bits (thumb_insn_r->arm_insn,0, 2); |
| 11906 | record_buf[0] = reg_src1; |
| 11907 | thumb_insn_r->reg_rec_count = 1; |
| 11908 | } |
| 11909 | else if (opcode2 >= 8 && opcode2 <= 10) |
| 11910 | { |
| 11911 | /* STR(2), STRB(2), STRH(2) . */ |
| 11912 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); |
| 11913 | reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8); |
| 11914 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]); |
| 11915 | regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]); |
| 11916 | if (8 == opcode2) |
| 11917 | record_buf_mem[0] = 4; /* STR (2). */ |
| 11918 | else if (10 == opcode2) |
| 11919 | record_buf_mem[0] = 1; /* STRB (2). */ |
| 11920 | else if (9 == opcode2) |
| 11921 | record_buf_mem[0] = 2; /* STRH (2). */ |
| 11922 | record_buf_mem[1] = u_regval[0] + u_regval[1]; |
| 11923 | thumb_insn_r->mem_rec_count = 1; |
| 11924 | } |
| 11925 | } |
| 11926 | else if (bit (thumb_insn_r->arm_insn, 11)) |
| 11927 | { |
| 11928 | /* Handle load from literal pool. */ |
| 11929 | /* LDR(3). */ |
| 11930 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 11931 | record_buf[0] = reg_src1; |
| 11932 | thumb_insn_r->reg_rec_count = 1; |
| 11933 | } |
| 11934 | else if (opcode1) |
| 11935 | { |
| 11936 | opcode2 = bits (thumb_insn_r->arm_insn, 8, 9); |
| 11937 | opcode3 = bits (thumb_insn_r->arm_insn, 0, 2); |
| 11938 | if ((3 == opcode2) && (!opcode3)) |
| 11939 | { |
| 11940 | /* Branch with exchange. */ |
| 11941 | record_buf[0] = ARM_PS_REGNUM; |
| 11942 | thumb_insn_r->reg_rec_count = 1; |
| 11943 | } |
| 11944 | else |
| 11945 | { |
| 11946 | /* Format 8; special data processing insns. */ |
| 11947 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); |
| 11948 | record_buf[0] = ARM_PS_REGNUM; |
| 11949 | record_buf[1] = reg_src1; |
| 11950 | thumb_insn_r->reg_rec_count = 2; |
| 11951 | } |
| 11952 | } |
| 11953 | else |
| 11954 | { |
| 11955 | /* Format 5; data processing insns. */ |
| 11956 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); |
| 11957 | if (bit (thumb_insn_r->arm_insn, 7)) |
| 11958 | { |
| 11959 | reg_src1 = reg_src1 + 8; |
| 11960 | } |
| 11961 | record_buf[0] = ARM_PS_REGNUM; |
| 11962 | record_buf[1] = reg_src1; |
| 11963 | thumb_insn_r->reg_rec_count = 2; |
| 11964 | } |
| 11965 | |
| 11966 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 11967 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, |
| 11968 | record_buf_mem); |
| 11969 | |
| 11970 | return 0; |
| 11971 | } |
| 11972 | |
| 11973 | /* Handling opcode 001 insns. */ |
| 11974 | |
| 11975 | static int |
| 11976 | thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r) |
| 11977 | { |
| 11978 | struct regcache *reg_cache = thumb_insn_r->regcache; |
| 11979 | uint32_t record_buf[8], record_buf_mem[8]; |
| 11980 | |
| 11981 | uint32_t reg_src1 = 0; |
| 11982 | uint32_t opcode = 0, immed_5 = 0; |
| 11983 | |
| 11984 | ULONGEST u_regval = 0; |
| 11985 | |
| 11986 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); |
| 11987 | |
| 11988 | if (opcode) |
| 11989 | { |
| 11990 | /* LDR(1). */ |
| 11991 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); |
| 11992 | record_buf[0] = reg_src1; |
| 11993 | thumb_insn_r->reg_rec_count = 1; |
| 11994 | } |
| 11995 | else |
| 11996 | { |
| 11997 | /* STR(1). */ |
| 11998 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); |
| 11999 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); |
| 12000 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); |
| 12001 | record_buf_mem[0] = 4; |
| 12002 | record_buf_mem[1] = u_regval + (immed_5 * 4); |
| 12003 | thumb_insn_r->mem_rec_count = 1; |
| 12004 | } |
| 12005 | |
| 12006 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 12007 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, |
| 12008 | record_buf_mem); |
| 12009 | |
| 12010 | return 0; |
| 12011 | } |
| 12012 | |
| 12013 | /* Handling opcode 100 insns. */ |
| 12014 | |
| 12015 | static int |
| 12016 | thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r) |
| 12017 | { |
| 12018 | struct regcache *reg_cache = thumb_insn_r->regcache; |
| 12019 | uint32_t record_buf[8], record_buf_mem[8]; |
| 12020 | |
| 12021 | uint32_t reg_src1 = 0; |
| 12022 | uint32_t opcode = 0, immed_8 = 0, immed_5 = 0; |
| 12023 | |
| 12024 | ULONGEST u_regval = 0; |
| 12025 | |
| 12026 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); |
| 12027 | |
| 12028 | if (3 == opcode) |
| 12029 | { |
| 12030 | /* LDR(4). */ |
| 12031 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 12032 | record_buf[0] = reg_src1; |
| 12033 | thumb_insn_r->reg_rec_count = 1; |
| 12034 | } |
| 12035 | else if (1 == opcode) |
| 12036 | { |
| 12037 | /* LDRH(1). */ |
| 12038 | reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2); |
| 12039 | record_buf[0] = reg_src1; |
| 12040 | thumb_insn_r->reg_rec_count = 1; |
| 12041 | } |
| 12042 | else if (2 == opcode) |
| 12043 | { |
| 12044 | /* STR(3). */ |
| 12045 | immed_8 = bits (thumb_insn_r->arm_insn, 0, 7); |
| 12046 | regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval); |
| 12047 | record_buf_mem[0] = 4; |
| 12048 | record_buf_mem[1] = u_regval + (immed_8 * 4); |
| 12049 | thumb_insn_r->mem_rec_count = 1; |
| 12050 | } |
| 12051 | else if (0 == opcode) |
| 12052 | { |
| 12053 | /* STRH(1). */ |
| 12054 | immed_5 = bits (thumb_insn_r->arm_insn, 6, 10); |
| 12055 | reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5); |
| 12056 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); |
| 12057 | record_buf_mem[0] = 2; |
| 12058 | record_buf_mem[1] = u_regval + (immed_5 * 2); |
| 12059 | thumb_insn_r->mem_rec_count = 1; |
| 12060 | } |
| 12061 | |
| 12062 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 12063 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, |
| 12064 | record_buf_mem); |
| 12065 | |
| 12066 | return 0; |
| 12067 | } |
| 12068 | |
| 12069 | /* Handling opcode 101 insns. */ |
| 12070 | |
| 12071 | static int |
| 12072 | thumb_record_misc (insn_decode_record *thumb_insn_r) |
| 12073 | { |
| 12074 | struct regcache *reg_cache = thumb_insn_r->regcache; |
| 12075 | |
| 12076 | uint32_t opcode = 0, opcode1 = 0, opcode2 = 0; |
| 12077 | uint32_t register_bits = 0, register_count = 0; |
| 12078 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; |
| 12079 | uint32_t record_buf[24], record_buf_mem[48]; |
| 12080 | uint32_t reg_src1; |
| 12081 | |
| 12082 | ULONGEST u_regval = 0; |
| 12083 | |
| 12084 | opcode = bits (thumb_insn_r->arm_insn, 11, 12); |
| 12085 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); |
| 12086 | opcode2 = bits (thumb_insn_r->arm_insn, 9, 12); |
| 12087 | |
| 12088 | if (14 == opcode2) |
| 12089 | { |
| 12090 | /* POP. */ |
| 12091 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); |
| 12092 | while (register_bits) |
| 12093 | { |
| 12094 | if (register_bits & 0x00000001) |
| 12095 | register_list[register_count++] = 1; |
| 12096 | register_bits = register_bits >> 1; |
| 12097 | } |
| 12098 | record_buf[register_count] = ARM_PS_REGNUM; |
| 12099 | record_buf[register_count + 1] = ARM_SP_REGNUM; |
| 12100 | thumb_insn_r->reg_rec_count = register_count + 2; |
| 12101 | for (register_count = 0; register_count < 8; register_count++) |
| 12102 | { |
| 12103 | if (register_list[register_count]) |
| 12104 | { |
| 12105 | record_buf[index] = register_count; |
| 12106 | index++; |
| 12107 | } |
| 12108 | } |
| 12109 | } |
| 12110 | else if (10 == opcode2) |
| 12111 | { |
| 12112 | /* PUSH. */ |
| 12113 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); |
| 12114 | regcache_raw_read_unsigned (reg_cache, ARM_PC_REGNUM, &u_regval); |
| 12115 | while (register_bits) |
| 12116 | { |
| 12117 | if (register_bits & 0x00000001) |
| 12118 | register_count++; |
| 12119 | register_bits = register_bits >> 1; |
| 12120 | } |
| 12121 | start_address = u_regval - \ |
| 12122 | (4 * (bit (thumb_insn_r->arm_insn, 8) + register_count)); |
| 12123 | thumb_insn_r->mem_rec_count = register_count; |
| 12124 | while (register_count) |
| 12125 | { |
| 12126 | record_buf_mem[(register_count * 2) - 1] = start_address; |
| 12127 | record_buf_mem[(register_count * 2) - 2] = 4; |
| 12128 | start_address = start_address + 4; |
| 12129 | register_count--; |
| 12130 | } |
| 12131 | record_buf[0] = ARM_SP_REGNUM; |
| 12132 | thumb_insn_r->reg_rec_count = 1; |
| 12133 | } |
| 12134 | else if (0x1E == opcode1) |
| 12135 | { |
| 12136 | /* BKPT insn. */ |
| 12137 | /* Handle enhanced software breakpoint insn, BKPT. */ |
| 12138 | /* CPSR is changed to be executed in ARM state, disabling normal |
| 12139 | interrupts, entering abort mode. */ |
| 12140 | /* According to high vector configuration PC is set. */ |
| 12141 | /* User hits breakpoint and type reverse, in that case, we need to go back with |
| 12142 | previous CPSR and Program Counter. */ |
| 12143 | record_buf[0] = ARM_PS_REGNUM; |
| 12144 | record_buf[1] = ARM_LR_REGNUM; |
| 12145 | thumb_insn_r->reg_rec_count = 2; |
| 12146 | /* We need to save SPSR value, which is not yet done. */ |
| 12147 | printf_unfiltered (_("Process record does not support instruction " |
| 12148 | "0x%0x at address %s.\n"), |
| 12149 | thumb_insn_r->arm_insn, |
| 12150 | paddress (thumb_insn_r->gdbarch, |
| 12151 | thumb_insn_r->this_addr)); |
| 12152 | return -1; |
| 12153 | } |
| 12154 | else if ((0 == opcode) || (1 == opcode)) |
| 12155 | { |
| 12156 | /* ADD(5), ADD(6). */ |
| 12157 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 12158 | record_buf[0] = reg_src1; |
| 12159 | thumb_insn_r->reg_rec_count = 1; |
| 12160 | } |
| 12161 | else if (2 == opcode) |
| 12162 | { |
| 12163 | /* ADD(7), SUB(4). */ |
| 12164 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 12165 | record_buf[0] = ARM_SP_REGNUM; |
| 12166 | thumb_insn_r->reg_rec_count = 1; |
| 12167 | } |
| 12168 | |
| 12169 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 12170 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, |
| 12171 | record_buf_mem); |
| 12172 | |
| 12173 | return 0; |
| 12174 | } |
| 12175 | |
| 12176 | /* Handling opcode 110 insns. */ |
| 12177 | |
| 12178 | static int |
| 12179 | thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r) |
| 12180 | { |
| 12181 | struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch); |
| 12182 | struct regcache *reg_cache = thumb_insn_r->regcache; |
| 12183 | |
| 12184 | uint32_t ret = 0; /* function return value: -1:record failure ; 0:success */ |
| 12185 | uint32_t reg_src1 = 0; |
| 12186 | uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count = 0; |
| 12187 | uint32_t register_list[8] = {0}, index = 0, start_address = 0; |
| 12188 | uint32_t record_buf[24], record_buf_mem[48]; |
| 12189 | |
| 12190 | ULONGEST u_regval = 0; |
| 12191 | |
| 12192 | opcode1 = bits (thumb_insn_r->arm_insn, 8, 12); |
| 12193 | opcode2 = bits (thumb_insn_r->arm_insn, 11, 12); |
| 12194 | |
| 12195 | if (1 == opcode2) |
| 12196 | { |
| 12197 | |
| 12198 | /* LDMIA. */ |
| 12199 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); |
| 12200 | /* Get Rn. */ |
| 12201 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 12202 | while (register_bits) |
| 12203 | { |
| 12204 | if (register_bits & 0x00000001) |
| 12205 | register_list[register_count++] = 1; |
| 12206 | register_bits = register_bits >> 1; |
| 12207 | } |
| 12208 | record_buf[register_count] = reg_src1; |
| 12209 | thumb_insn_r->reg_rec_count = register_count + 1; |
| 12210 | for (register_count = 0; register_count < 8; register_count++) |
| 12211 | { |
| 12212 | if (register_list[register_count]) |
| 12213 | { |
| 12214 | record_buf[index] = register_count; |
| 12215 | index++; |
| 12216 | } |
| 12217 | } |
| 12218 | } |
| 12219 | else if (0 == opcode2) |
| 12220 | { |
| 12221 | /* It handles both STMIA. */ |
| 12222 | register_bits = bits (thumb_insn_r->arm_insn, 0, 7); |
| 12223 | /* Get Rn. */ |
| 12224 | reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10); |
| 12225 | regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval); |
| 12226 | while (register_bits) |
| 12227 | { |
| 12228 | if (register_bits & 0x00000001) |
| 12229 | register_count++; |
| 12230 | register_bits = register_bits >> 1; |
| 12231 | } |
| 12232 | start_address = u_regval; |
| 12233 | thumb_insn_r->mem_rec_count = register_count; |
| 12234 | while (register_count) |
| 12235 | { |
| 12236 | record_buf_mem[(register_count * 2) - 1] = start_address; |
| 12237 | record_buf_mem[(register_count * 2) - 2] = 4; |
| 12238 | start_address = start_address + 4; |
| 12239 | register_count--; |
| 12240 | } |
| 12241 | } |
| 12242 | else if (0x1F == opcode1) |
| 12243 | { |
| 12244 | /* Handle arm syscall insn. */ |
| 12245 | if (tdep->arm_swi_record != NULL) |
| 12246 | { |
| 12247 | ret = tdep->arm_swi_record(reg_cache); |
| 12248 | } |
| 12249 | else |
| 12250 | { |
| 12251 | printf_unfiltered (_("no syscall record support\n")); |
| 12252 | return -1; |
| 12253 | } |
| 12254 | } |
| 12255 | |
| 12256 | /* B (1), conditional branch is automatically taken care in process_record, |
| 12257 | as PC is saved there. */ |
| 12258 | |
| 12259 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 12260 | MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count, |
| 12261 | record_buf_mem); |
| 12262 | |
| 12263 | return ret; |
| 12264 | } |
| 12265 | |
| 12266 | /* Handling opcode 111 insns. */ |
| 12267 | |
| 12268 | static int |
| 12269 | thumb_record_branch (insn_decode_record *thumb_insn_r) |
| 12270 | { |
| 12271 | uint32_t record_buf[8]; |
| 12272 | uint32_t bits_h = 0; |
| 12273 | |
| 12274 | bits_h = bits (thumb_insn_r->arm_insn, 11, 12); |
| 12275 | |
| 12276 | if (2 == bits_h || 3 == bits_h) |
| 12277 | { |
| 12278 | /* BL */ |
| 12279 | record_buf[0] = ARM_LR_REGNUM; |
| 12280 | thumb_insn_r->reg_rec_count = 1; |
| 12281 | } |
| 12282 | else if (1 == bits_h) |
| 12283 | { |
| 12284 | /* BLX(1). */ |
| 12285 | record_buf[0] = ARM_PS_REGNUM; |
| 12286 | record_buf[1] = ARM_LR_REGNUM; |
| 12287 | thumb_insn_r->reg_rec_count = 2; |
| 12288 | } |
| 12289 | |
| 12290 | /* B(2) is automatically taken care in process_record, as PC is |
| 12291 | saved there. */ |
| 12292 | |
| 12293 | REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count, record_buf); |
| 12294 | |
| 12295 | return 0; |
| 12296 | } |
| 12297 | |
| 12298 | |
| 12299 | /* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success |
| 12300 | and positive val on fauilure. */ |
| 12301 | |
| 12302 | static int |
| 12303 | extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size) |
| 12304 | { |
| 12305 | gdb_byte buf[insn_size]; |
| 12306 | |
| 12307 | memset (&buf[0], 0, insn_size); |
| 12308 | |
| 12309 | if (target_read_memory (insn_record->this_addr, &buf[0], insn_size)) |
| 12310 | return 1; |
| 12311 | insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0], |
| 12312 | insn_size, |
| 12313 | gdbarch_byte_order (insn_record->gdbarch)); |
| 12314 | return 0; |
| 12315 | } |
| 12316 | |
| 12317 | typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*); |
| 12318 | |
| 12319 | /* Decode arm/thumb insn depending on condition cods and opcodes; and |
| 12320 | dispatch it. */ |
| 12321 | |
| 12322 | static int |
| 12323 | decode_insn (insn_decode_record *arm_record, record_type_t record_type, |
| 12324 | uint32_t insn_size) |
| 12325 | { |
| 12326 | |
| 12327 | /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm instruction. */ |
| 12328 | static const sti_arm_hdl_fp_t const arm_handle_insn[8] = |
| 12329 | { |
| 12330 | arm_record_data_proc_misc_ld_str, /* 000. */ |
| 12331 | arm_record_data_proc_imm, /* 001. */ |
| 12332 | arm_record_ld_st_imm_offset, /* 010. */ |
| 12333 | arm_record_ld_st_reg_offset, /* 011. */ |
| 12334 | arm_record_ld_st_multiple, /* 100. */ |
| 12335 | arm_record_b_bl, /* 101. */ |
| 12336 | arm_record_coproc, /* 110. */ |
| 12337 | arm_record_coproc_data_proc /* 111. */ |
| 12338 | }; |
| 12339 | |
| 12340 | /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb instruction. */ |
| 12341 | static const sti_arm_hdl_fp_t const thumb_handle_insn[8] = |
| 12342 | { \ |
| 12343 | thumb_record_shift_add_sub, /* 000. */ |
| 12344 | thumb_record_add_sub_cmp_mov, /* 001. */ |
| 12345 | thumb_record_ld_st_reg_offset, /* 010. */ |
| 12346 | thumb_record_ld_st_imm_offset, /* 011. */ |
| 12347 | thumb_record_ld_st_stack, /* 100. */ |
| 12348 | thumb_record_misc, /* 101. */ |
| 12349 | thumb_record_ldm_stm_swi, /* 110. */ |
| 12350 | thumb_record_branch /* 111. */ |
| 12351 | }; |
| 12352 | |
| 12353 | uint32_t ret = 0; /* return value: negative:failure 0:success. */ |
| 12354 | uint32_t insn_id = 0; |
| 12355 | |
| 12356 | if (extract_arm_insn (arm_record, insn_size)) |
| 12357 | { |
| 12358 | if (record_debug) |
| 12359 | { |
| 12360 | printf_unfiltered (_("Process record: error reading memory at " |
| 12361 | "addr %s len = %d.\n"), |
| 12362 | paddress (arm_record->gdbarch, arm_record->this_addr), insn_size); |
| 12363 | } |
| 12364 | return -1; |
| 12365 | } |
| 12366 | else if (ARM_RECORD == record_type) |
| 12367 | { |
| 12368 | arm_record->cond = bits (arm_record->arm_insn, 28, 31); |
| 12369 | insn_id = bits (arm_record->arm_insn, 25, 27); |
| 12370 | ret = arm_record_extension_space (arm_record); |
| 12371 | /* If this insn has fallen into extension space |
| 12372 | then we need not decode it anymore. */ |
| 12373 | if (ret != -1 && !INSN_RECORDED(arm_record)) |
| 12374 | { |
| 12375 | ret = arm_handle_insn[insn_id] (arm_record); |
| 12376 | } |
| 12377 | } |
| 12378 | else if (THUMB_RECORD == record_type) |
| 12379 | { |
| 12380 | /* As thumb does not have condition codes, we set negative. */ |
| 12381 | arm_record->cond = -1; |
| 12382 | insn_id = bits (arm_record->arm_insn, 13, 15); |
| 12383 | ret = thumb_handle_insn[insn_id] (arm_record); |
| 12384 | } |
| 12385 | else if (THUMB2_RECORD == record_type) |
| 12386 | { |
| 12387 | printf_unfiltered (_("Process record doesnt support thumb32 instruction " |
| 12388 | "0x%0x at address %s.\n"),arm_record->arm_insn, |
| 12389 | paddress (arm_record->gdbarch, |
| 12390 | arm_record->this_addr)); |
| 12391 | ret = -1; |
| 12392 | } |
| 12393 | else |
| 12394 | { |
| 12395 | /* Throw assertion. */ |
| 12396 | gdb_assert_not_reached ("not a valid instruction, could not decode"); |
| 12397 | } |
| 12398 | |
| 12399 | return ret; |
| 12400 | } |
| 12401 | |
| 12402 | |
| 12403 | /* Cleans up local record registers and memory allocations. */ |
| 12404 | |
| 12405 | static void |
| 12406 | deallocate_reg_mem (insn_decode_record *record) |
| 12407 | { |
| 12408 | xfree (record->arm_regs); |
| 12409 | xfree (record->arm_mems); |
| 12410 | } |
| 12411 | |
| 12412 | |
| 12413 | /* Parse the current instruction and record the values of the registers and |
| 12414 | memory that will be changed in current instruction to record_arch_list". |
| 12415 | Return -1 if something is wrong. */ |
| 12416 | |
| 12417 | int |
| 12418 | arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache, |
| 12419 | CORE_ADDR insn_addr) |
| 12420 | { |
| 12421 | |
| 12422 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 12423 | uint32_t no_of_rec = 0; |
| 12424 | uint32_t ret = 0; /* return value: -1:record failure ; 0:success */ |
| 12425 | ULONGEST t_bit = 0, insn_id = 0; |
| 12426 | |
| 12427 | ULONGEST u_regval = 0; |
| 12428 | |
| 12429 | insn_decode_record arm_record; |
| 12430 | |
| 12431 | memset (&arm_record, 0, sizeof (insn_decode_record)); |
| 12432 | arm_record.regcache = regcache; |
| 12433 | arm_record.this_addr = insn_addr; |
| 12434 | arm_record.gdbarch = gdbarch; |
| 12435 | |
| 12436 | |
| 12437 | if (record_debug > 1) |
| 12438 | { |
| 12439 | fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record " |
| 12440 | "addr = %s\n", |
| 12441 | paddress (gdbarch, arm_record.this_addr)); |
| 12442 | } |
| 12443 | |
| 12444 | if (extract_arm_insn (&arm_record, 2)) |
| 12445 | { |
| 12446 | if (record_debug) |
| 12447 | { |
| 12448 | printf_unfiltered (_("Process record: error reading memory at " |
| 12449 | "addr %s len = %d.\n"), |
| 12450 | paddress (arm_record.gdbarch, |
| 12451 | arm_record.this_addr), 2); |
| 12452 | } |
| 12453 | return -1; |
| 12454 | } |
| 12455 | |
| 12456 | /* Check the insn, whether it is thumb or arm one. */ |
| 12457 | |
| 12458 | t_bit = arm_psr_thumb_bit (arm_record.gdbarch); |
| 12459 | regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM, &u_regval); |
| 12460 | |
| 12461 | |
| 12462 | if (!(u_regval & t_bit)) |
| 12463 | { |
| 12464 | /* We are decoding arm insn. */ |
| 12465 | ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES); |
| 12466 | } |
| 12467 | else |
| 12468 | { |
| 12469 | insn_id = bits (arm_record.arm_insn, 11, 15); |
| 12470 | /* is it thumb2 insn? */ |
| 12471 | if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id)) |
| 12472 | { |
| 12473 | ret = decode_insn (&arm_record, THUMB2_RECORD, |
| 12474 | THUMB2_INSN_SIZE_BYTES); |
| 12475 | } |
| 12476 | else |
| 12477 | { |
| 12478 | /* We are decoding thumb insn. */ |
| 12479 | ret = decode_insn (&arm_record, THUMB_RECORD, THUMB_INSN_SIZE_BYTES); |
| 12480 | } |
| 12481 | } |
| 12482 | |
| 12483 | if (0 == ret) |
| 12484 | { |
| 12485 | /* Record registers. */ |
| 12486 | record_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM); |
| 12487 | if (arm_record.arm_regs) |
| 12488 | { |
| 12489 | for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count; no_of_rec++) |
| 12490 | { |
| 12491 | if (record_arch_list_add_reg (arm_record.regcache , |
| 12492 | arm_record.arm_regs[no_of_rec])) |
| 12493 | ret = -1; |
| 12494 | } |
| 12495 | } |
| 12496 | /* Record memories. */ |
| 12497 | if (arm_record.arm_mems) |
| 12498 | { |
| 12499 | for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count; no_of_rec++) |
| 12500 | { |
| 12501 | if (record_arch_list_add_mem |
| 12502 | ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr, |
| 12503 | arm_record.arm_mems[no_of_rec].len)) |
| 12504 | ret = -1; |
| 12505 | } |
| 12506 | } |
| 12507 | |
| 12508 | if (record_arch_list_add_end ()) |
| 12509 | ret = -1; |
| 12510 | } |
| 12511 | |
| 12512 | |
| 12513 | deallocate_reg_mem (&arm_record); |
| 12514 | |
| 12515 | return ret; |
| 12516 | } |
| 12517 | |