| 1 | /* Stack unwinding code based on dwarf2 frame info for GDB, the GNU debugger. |
| 2 | Copyright 2001, 2002 Free Software Foundation, Inc. |
| 3 | Contributed by Jiri Smid, SuSE Labs. |
| 4 | Based on code written by Daniel Berlin (dan@dberlin.org). |
| 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 2 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, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "symtab.h" |
| 25 | #include "symfile.h" |
| 26 | #include "objfiles.h" |
| 27 | #include "target.h" |
| 28 | #include "elf/dwarf2.h" |
| 29 | #include "inferior.h" |
| 30 | #include "regcache.h" |
| 31 | #include "dwarf2cfi.h" |
| 32 | |
| 33 | /* Common Information Entry - holds information that is shared among many |
| 34 | Frame Descriptors. */ |
| 35 | struct cie_unit |
| 36 | { |
| 37 | /* Offset of this unit in dwarf_frame_buffer. */ |
| 38 | ULONGEST offset; |
| 39 | |
| 40 | /* A null-terminated string that identifies the augmentation to this CIE or |
| 41 | to the FDEs that use it. */ |
| 42 | char *augmentation; |
| 43 | |
| 44 | /* A constant that is factored out of all advance location instructions. */ |
| 45 | unsigned int code_align; |
| 46 | |
| 47 | /* A constant that is factored out of all offset instructions. */ |
| 48 | int data_align; |
| 49 | |
| 50 | /* A constant that indicates which regiter represents the return address |
| 51 | of a function. */ |
| 52 | unsigned char ra; |
| 53 | |
| 54 | /* Indicates how addresses are encoded. */ |
| 55 | unsigned char addr_encoding; |
| 56 | |
| 57 | /* Pointer and length of the cie program. */ |
| 58 | char *data; |
| 59 | unsigned int data_length; |
| 60 | |
| 61 | struct objfile *objfile; |
| 62 | |
| 63 | /* Next in chain. */ |
| 64 | struct cie_unit *next; |
| 65 | }; |
| 66 | |
| 67 | /* Frame Description Entry. */ |
| 68 | struct fde_unit |
| 69 | { |
| 70 | /* Address of the first location associated with this entry. */ |
| 71 | CORE_ADDR initial_location; |
| 72 | |
| 73 | /* Length of program section described by this entry. */ |
| 74 | CORE_ADDR address_range; |
| 75 | |
| 76 | /* Pointer to asociated CIE. */ |
| 77 | struct cie_unit *cie_ptr; |
| 78 | |
| 79 | /* Pointer and length of the cie program. */ |
| 80 | char *data; |
| 81 | unsigned int data_length; |
| 82 | }; |
| 83 | |
| 84 | struct fde_array |
| 85 | { |
| 86 | struct fde_unit **array; |
| 87 | int elems; |
| 88 | int array_size; |
| 89 | }; |
| 90 | |
| 91 | struct context_reg |
| 92 | { |
| 93 | union |
| 94 | { |
| 95 | unsigned int reg; |
| 96 | long offset; |
| 97 | CORE_ADDR addr; |
| 98 | } |
| 99 | loc; |
| 100 | enum |
| 101 | { |
| 102 | REG_CTX_UNSAVED, |
| 103 | REG_CTX_SAVED_OFFSET, |
| 104 | REG_CTX_SAVED_REG, |
| 105 | REG_CTX_SAVED_ADDR, |
| 106 | REG_CTX_VALUE, |
| 107 | } |
| 108 | how; |
| 109 | }; |
| 110 | |
| 111 | /* This is the register and unwind state for a particular frame. */ |
| 112 | struct context |
| 113 | { |
| 114 | struct context_reg *reg; |
| 115 | |
| 116 | CORE_ADDR cfa; |
| 117 | CORE_ADDR ra; |
| 118 | void *lsda; |
| 119 | int args_size; |
| 120 | }; |
| 121 | |
| 122 | struct frame_state_reg |
| 123 | { |
| 124 | union |
| 125 | { |
| 126 | unsigned int reg; |
| 127 | long offset; |
| 128 | unsigned char *exp; |
| 129 | } |
| 130 | loc; |
| 131 | enum |
| 132 | { |
| 133 | REG_UNSAVED, |
| 134 | REG_SAVED_OFFSET, |
| 135 | REG_SAVED_REG, |
| 136 | REG_SAVED_EXP, |
| 137 | } |
| 138 | how; |
| 139 | }; |
| 140 | |
| 141 | struct frame_state |
| 142 | { |
| 143 | /* Each register save state can be described in terms of a CFA slot, |
| 144 | another register, or a location expression. */ |
| 145 | struct frame_state_regs |
| 146 | { |
| 147 | struct frame_state_reg *reg; |
| 148 | |
| 149 | /* Used to implement DW_CFA_remember_state. */ |
| 150 | struct frame_state_regs *prev; |
| 151 | } |
| 152 | regs; |
| 153 | |
| 154 | /* The CFA can be described in terms of a reg+offset or a |
| 155 | location expression. */ |
| 156 | long cfa_offset; |
| 157 | int cfa_reg; |
| 158 | unsigned char *cfa_exp; |
| 159 | enum |
| 160 | { |
| 161 | CFA_UNSET, |
| 162 | CFA_REG_OFFSET, |
| 163 | CFA_EXP, |
| 164 | } |
| 165 | cfa_how; |
| 166 | |
| 167 | /* The PC described by the current frame state. */ |
| 168 | CORE_ADDR pc; |
| 169 | |
| 170 | /* The information we care about from the CIE/FDE. */ |
| 171 | int data_align; |
| 172 | unsigned int code_align; |
| 173 | unsigned char retaddr_column; |
| 174 | unsigned char addr_encoding; |
| 175 | |
| 176 | struct objfile *objfile; |
| 177 | }; |
| 178 | |
| 179 | #define UNWIND_CONTEXT(fi) ((struct context *) (fi->context)) |
| 180 | \f |
| 181 | |
| 182 | static struct cie_unit *cie_chunks; |
| 183 | static struct fde_array fde_chunks; |
| 184 | /* Obstack for allocating temporary storage used during unwind operations. */ |
| 185 | static struct obstack unwind_tmp_obstack; |
| 186 | |
| 187 | extern file_ptr dwarf_frame_offset; |
| 188 | extern unsigned int dwarf_frame_size; |
| 189 | extern file_ptr dwarf_eh_frame_offset; |
| 190 | extern unsigned int dwarf_eh_frame_size; |
| 191 | |
| 192 | static char *dwarf_frame_buffer; |
| 193 | \f |
| 194 | |
| 195 | extern char *dwarf2_read_section (struct objfile *objfile, file_ptr offset, |
| 196 | unsigned int size); |
| 197 | |
| 198 | static struct fde_unit *fde_unit_alloc (void); |
| 199 | static struct cie_unit *cie_unit_alloc (void); |
| 200 | static void fde_chunks_need_space (); |
| 201 | |
| 202 | static struct context *context_alloc (); |
| 203 | static struct frame_state *frame_state_alloc (); |
| 204 | static void unwind_tmp_obstack_free (); |
| 205 | static void context_cpy (struct context *dst, struct context *src); |
| 206 | |
| 207 | static unsigned int read_1u (bfd *abfd, char **p); |
| 208 | static int read_1s (bfd *abfd, char **p); |
| 209 | static unsigned int read_2u (bfd *abfd, char **p); |
| 210 | static int read_2s (bfd *abfd, char **p); |
| 211 | static unsigned int read_4u (bfd *abfd, char **p); |
| 212 | static int read_4s (bfd *abfd, char **p); |
| 213 | static ULONGEST read_8u (bfd *abfd, char **p); |
| 214 | static LONGEST read_8s (bfd *abfd, char **p); |
| 215 | |
| 216 | static ULONGEST read_uleb128 (bfd *abfd, char **p); |
| 217 | static LONGEST read_sleb128 (bfd *abfd, char **p); |
| 218 | static CORE_ADDR read_pointer (bfd *abfd, char **p); |
| 219 | static CORE_ADDR read_encoded_pointer (bfd *abfd, char **p, |
| 220 | unsigned char encoding); |
| 221 | |
| 222 | static LONGEST read_initial_length (bfd *abfd, char *buf, int *bytes_read); |
| 223 | static ULONGEST read_length (bfd *abfd, char *buf, int *bytes_read, |
| 224 | int dwarf64); |
| 225 | static ULONGEST read_address (bfd *abfd, char **p); |
| 226 | |
| 227 | |
| 228 | static int is_cie (ULONGEST cie_id, int dwarf64); |
| 229 | static int compare_fde_unit (const void *a, const void *b); |
| 230 | void dwarf2_build_frame_info (struct objfile *objfile); |
| 231 | |
| 232 | static void execute_cfa_program (struct objfile *objfile, char *insn_ptr, |
| 233 | char *insn_end, struct context *context, |
| 234 | struct frame_state *fs); |
| 235 | static struct fde_unit *get_fde_for_addr (CORE_ADDR pc); |
| 236 | static void frame_state_for (struct context *context, struct frame_state *fs); |
| 237 | static void get_reg (char *reg, struct context *context, int regnum); |
| 238 | static CORE_ADDR execute_stack_op (struct objfile *objfile, |
| 239 | char *op_ptr, char *op_end, |
| 240 | struct context *context, CORE_ADDR initial); |
| 241 | static void update_context (struct context *context, struct frame_state *fs, |
| 242 | int chain); |
| 243 | |
| 244 | \f |
| 245 | /* Memory allocation functions. */ |
| 246 | static struct fde_unit * |
| 247 | fde_unit_alloc (void) |
| 248 | { |
| 249 | struct fde_unit *fde; |
| 250 | |
| 251 | fde = (struct fde_unit *) xmalloc (sizeof (struct fde_unit)); |
| 252 | memset (fde, 0, sizeof (struct fde_unit)); |
| 253 | return fde; |
| 254 | } |
| 255 | |
| 256 | static struct cie_unit * |
| 257 | cie_unit_alloc (void) |
| 258 | { |
| 259 | struct cie_unit *cie; |
| 260 | |
| 261 | cie = (struct cie_unit *) xmalloc (sizeof (struct cie_unit)); |
| 262 | memset (cie, 0, sizeof (struct cie_unit)); |
| 263 | return cie; |
| 264 | } |
| 265 | |
| 266 | static void |
| 267 | fde_chunks_need_space () |
| 268 | { |
| 269 | if (fde_chunks.elems < fde_chunks.array_size) |
| 270 | return; |
| 271 | fde_chunks.array_size = |
| 272 | fde_chunks.array_size ? 2 * fde_chunks.array_size : 1024; |
| 273 | fde_chunks.array = |
| 274 | xrealloc (fde_chunks.array, |
| 275 | sizeof (struct fde_unit) * fde_chunks.array_size); |
| 276 | } |
| 277 | |
| 278 | /* Alocate a new `struct context' on temporary obstack. */ |
| 279 | static struct context * |
| 280 | context_alloc () |
| 281 | { |
| 282 | struct context *context; |
| 283 | struct context_reg *reg; |
| 284 | int regs_size = sizeof (struct context_reg) * NUM_REGS; |
| 285 | |
| 286 | context = (struct context *) obstack_alloc (&unwind_tmp_obstack, |
| 287 | sizeof (struct context)); |
| 288 | memset (context, 0, sizeof (struct context)); |
| 289 | context->reg = (struct context_reg *) obstack_alloc (&unwind_tmp_obstack, |
| 290 | regs_size); |
| 291 | memset (context->reg, 0, regs_size); |
| 292 | return context; |
| 293 | } |
| 294 | |
| 295 | /* Alocate a new `struct frame_state' on temporary obstack. */ |
| 296 | static struct frame_state * |
| 297 | frame_state_alloc () |
| 298 | { |
| 299 | struct frame_state *fs; |
| 300 | struct frame_state_reg *reg; |
| 301 | int regs_size = sizeof (struct frame_state_reg) * NUM_REGS; |
| 302 | |
| 303 | fs = (struct frame_state *) obstack_alloc (&unwind_tmp_obstack, |
| 304 | sizeof (struct frame_state)); |
| 305 | memset (fs, 0, sizeof (struct frame_state)); |
| 306 | fs->regs.reg = (struct frame_state_reg *) obstack_alloc (&unwind_tmp_obstack, |
| 307 | regs_size); |
| 308 | memset (fs->regs.reg, 0, regs_size); |
| 309 | return fs; |
| 310 | } |
| 311 | |
| 312 | static void |
| 313 | unwind_tmp_obstack_free () |
| 314 | { |
| 315 | obstack_free (&unwind_tmp_obstack, NULL); |
| 316 | obstack_init (&unwind_tmp_obstack); |
| 317 | } |
| 318 | |
| 319 | static void |
| 320 | context_cpy (struct context *dst, struct context *src) |
| 321 | { |
| 322 | struct context_reg *reg = dst->reg; |
| 323 | int regs_size = sizeof (struct context_reg) * NUM_REGS; |
| 324 | |
| 325 | *dst = *src; |
| 326 | memcpy (dst->reg, src->reg, regs_size); |
| 327 | } |
| 328 | \f |
| 329 | |
| 330 | static unsigned int |
| 331 | read_1u (bfd *abfd, char **p) |
| 332 | { |
| 333 | unsigned ret; |
| 334 | |
| 335 | ret= bfd_get_8 (abfd, (bfd_byte *) *p); |
| 336 | (*p) ++; |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | static int |
| 341 | read_1s (bfd *abfd, char **p) |
| 342 | { |
| 343 | int ret; |
| 344 | |
| 345 | ret= bfd_get_signed_8 (abfd, (bfd_byte *) *p); |
| 346 | (*p) ++; |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | static unsigned int |
| 351 | read_2u (bfd *abfd, char **p) |
| 352 | { |
| 353 | unsigned ret; |
| 354 | |
| 355 | ret= bfd_get_16 (abfd, (bfd_byte *) *p); |
| 356 | (*p) ++; |
| 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | static int |
| 361 | read_2s (bfd *abfd, char **p) |
| 362 | { |
| 363 | int ret; |
| 364 | |
| 365 | ret= bfd_get_signed_16 (abfd, (bfd_byte *) *p); |
| 366 | (*p) += 2; |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | static unsigned int |
| 371 | read_4u (bfd *abfd, char **p) |
| 372 | { |
| 373 | unsigned int ret; |
| 374 | |
| 375 | ret= bfd_get_32 (abfd, (bfd_byte *) *p); |
| 376 | (*p) += 4; |
| 377 | return ret; |
| 378 | } |
| 379 | |
| 380 | static int |
| 381 | read_4s (bfd *abfd, char **p) |
| 382 | { |
| 383 | int ret; |
| 384 | |
| 385 | ret= bfd_get_signed_32 (abfd, (bfd_byte *) *p); |
| 386 | (*p) += 4; |
| 387 | return ret; |
| 388 | } |
| 389 | |
| 390 | static ULONGEST |
| 391 | read_8u (bfd *abfd, char **p) |
| 392 | { |
| 393 | ULONGEST ret; |
| 394 | |
| 395 | ret = bfd_get_64 (abfd, (bfd_byte *) *p); |
| 396 | (*p) += 8; |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | static LONGEST |
| 401 | read_8s (bfd *abfd, char **p) |
| 402 | { |
| 403 | LONGEST ret; |
| 404 | |
| 405 | ret = bfd_get_signed_64 (abfd, (bfd_byte *) *p); |
| 406 | (*p) += 8; |
| 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | static ULONGEST |
| 411 | read_uleb128 (bfd *abfd, char **p) |
| 412 | { |
| 413 | ULONGEST ret; |
| 414 | int i, shift; |
| 415 | unsigned char byte; |
| 416 | |
| 417 | ret = 0; |
| 418 | shift = 0; |
| 419 | i = 0; |
| 420 | while (1) |
| 421 | { |
| 422 | byte = bfd_get_8 (abfd, (bfd_byte *) *p); |
| 423 | (*p) ++; |
| 424 | ret |= ((unsigned long) (byte & 127) << shift); |
| 425 | if ((byte & 128) == 0) |
| 426 | { |
| 427 | break; |
| 428 | } |
| 429 | shift += 7; |
| 430 | } |
| 431 | return ret; |
| 432 | } |
| 433 | |
| 434 | static LONGEST |
| 435 | read_sleb128 (bfd *abfd, char **p) |
| 436 | { |
| 437 | LONGEST ret; |
| 438 | int i, shift, size, num_read; |
| 439 | unsigned char byte; |
| 440 | |
| 441 | ret = 0; |
| 442 | shift = 0; |
| 443 | size = 32; |
| 444 | num_read = 0; |
| 445 | i = 0; |
| 446 | while (1) |
| 447 | { |
| 448 | byte = bfd_get_8 (abfd, (bfd_byte *) *p); |
| 449 | (*p) ++; |
| 450 | ret |= ((long) (byte & 127) << shift); |
| 451 | shift += 7; |
| 452 | if ((byte & 128) == 0) |
| 453 | { |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | if ((shift < size) && (byte & 0x40)) |
| 458 | { |
| 459 | ret |= -(1 << shift); |
| 460 | } |
| 461 | return ret; |
| 462 | } |
| 463 | |
| 464 | static CORE_ADDR |
| 465 | read_pointer (bfd *abfd, char **p) |
| 466 | { |
| 467 | switch (TARGET_ADDR_BIT / TARGET_CHAR_BIT) |
| 468 | { |
| 469 | case 4: |
| 470 | return read_4u (abfd, p); |
| 471 | case 8: |
| 472 | return read_8u (abfd, p); |
| 473 | default: |
| 474 | error ("dwarf cfi error: unsupported target address length."); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | static CORE_ADDR |
| 479 | read_encoded_pointer (bfd *abfd, char **p, unsigned char encoding) |
| 480 | { |
| 481 | CORE_ADDR ret; |
| 482 | |
| 483 | switch (encoding & 0x0f) |
| 484 | { |
| 485 | case DW_EH_PE_absptr: |
| 486 | ret = read_pointer (abfd, p); |
| 487 | break; |
| 488 | |
| 489 | case DW_EH_PE_uleb128: |
| 490 | ret = read_uleb128 (abfd, p); |
| 491 | break; |
| 492 | case DW_EH_PE_sleb128: |
| 493 | ret = read_sleb128 (abfd, p); |
| 494 | break; |
| 495 | |
| 496 | case DW_EH_PE_udata2: |
| 497 | ret = read_2u (abfd, p); |
| 498 | break; |
| 499 | case DW_EH_PE_udata4: |
| 500 | ret = read_4u (abfd, p); |
| 501 | break; |
| 502 | case DW_EH_PE_udata8: |
| 503 | ret = read_8u (abfd, p); |
| 504 | break; |
| 505 | |
| 506 | case DW_EH_PE_sdata2: |
| 507 | ret = read_2s (abfd, p); |
| 508 | break; |
| 509 | case DW_EH_PE_sdata4: |
| 510 | ret = read_4s (abfd, p); |
| 511 | break; |
| 512 | case DW_EH_PE_sdata8: |
| 513 | ret = read_8s (abfd, p); |
| 514 | break; |
| 515 | |
| 516 | default: |
| 517 | internal_error (__FILE__, __LINE__, |
| 518 | "read_encoded_pointer: unknown pointer encoding"); |
| 519 | } |
| 520 | |
| 521 | if (ret != 0) |
| 522 | switch (encoding & 0xf0) |
| 523 | { |
| 524 | case DW_EH_PE_absptr: |
| 525 | break; |
| 526 | case DW_EH_PE_pcrel: |
| 527 | ret += (CORE_ADDR) *p; |
| 528 | break; |
| 529 | case DW_EH_PE_textrel: |
| 530 | case DW_EH_PE_datarel: |
| 531 | case DW_EH_PE_funcrel: |
| 532 | default: |
| 533 | internal_error (__FILE__, __LINE__, |
| 534 | "read_encoded_pointer: unknown pointer encoding"); |
| 535 | } |
| 536 | |
| 537 | return ret; |
| 538 | } |
| 539 | |
| 540 | static LONGEST |
| 541 | read_initial_length (bfd * abfd, char *buf, int *bytes_read) |
| 542 | { |
| 543 | LONGEST ret = 0; |
| 544 | |
| 545 | ret = bfd_get_32 (abfd, (bfd_byte *) buf); |
| 546 | |
| 547 | if (ret == 0xffffffff) |
| 548 | { |
| 549 | ret = bfd_get_64 (abfd, (bfd_byte *) buf + 4); |
| 550 | *bytes_read = 12; |
| 551 | } |
| 552 | else |
| 553 | { |
| 554 | *bytes_read = 4; |
| 555 | } |
| 556 | |
| 557 | return ret; |
| 558 | } |
| 559 | |
| 560 | static ULONGEST |
| 561 | read_length (bfd * abfd, char *buf, int *bytes_read, int dwarf64) |
| 562 | { |
| 563 | if (dwarf64) |
| 564 | { |
| 565 | *bytes_read = 8; |
| 566 | return read_8u (abfd, &buf); |
| 567 | } |
| 568 | else |
| 569 | { |
| 570 | *bytes_read = 4; |
| 571 | return read_4u (abfd, &buf); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | static void |
| 576 | execute_cfa_program ( struct objfile *objfile, char *insn_ptr, char *insn_end, |
| 577 | struct context *context, struct frame_state *fs) |
| 578 | { |
| 579 | struct frame_state_regs *unused_rs = NULL; |
| 580 | |
| 581 | /* Don't allow remember/restore between CIE and FDE programs. */ |
| 582 | fs->regs.prev = NULL; |
| 583 | |
| 584 | while (insn_ptr < insn_end && fs->pc < context->ra) |
| 585 | { |
| 586 | unsigned char insn = *insn_ptr++; |
| 587 | ULONGEST reg, uoffset; |
| 588 | LONGEST offset; |
| 589 | int bytes_read; |
| 590 | |
| 591 | if (insn & DW_CFA_advance_loc) |
| 592 | fs->pc += (insn & 0x3f) * fs->code_align; |
| 593 | else if (insn & DW_CFA_offset) |
| 594 | { |
| 595 | reg = insn & 0x3f; |
| 596 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 597 | offset = (long) uoffset * fs->data_align; |
| 598 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
| 599 | fs->regs.reg[reg].loc.offset = offset; |
| 600 | } |
| 601 | else if (insn & DW_CFA_restore) |
| 602 | { |
| 603 | reg = insn & 0x3f; |
| 604 | fs->regs.reg[reg].how = REG_UNSAVED; |
| 605 | } |
| 606 | else |
| 607 | switch (insn) |
| 608 | { |
| 609 | case DW_CFA_set_loc: |
| 610 | fs->pc = read_encoded_pointer (objfile->obfd, &insn_ptr, |
| 611 | fs->addr_encoding); |
| 612 | break; |
| 613 | |
| 614 | case DW_CFA_advance_loc1: |
| 615 | fs->pc += read_1u (objfile->obfd, &insn_ptr); |
| 616 | break; |
| 617 | case DW_CFA_advance_loc2: |
| 618 | fs->pc += read_2u (objfile->obfd, &insn_ptr); |
| 619 | break; |
| 620 | case DW_CFA_advance_loc4: |
| 621 | fs->pc += read_4u (objfile->obfd, &insn_ptr); |
| 622 | break; |
| 623 | |
| 624 | case DW_CFA_offset_extended: |
| 625 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 626 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 627 | offset = (long) uoffset *fs->data_align; |
| 628 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
| 629 | fs->regs.reg[reg].loc.offset = offset; |
| 630 | break; |
| 631 | |
| 632 | case DW_CFA_restore_extended: |
| 633 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 634 | fs->regs.reg[reg].how = REG_UNSAVED; |
| 635 | break; |
| 636 | |
| 637 | case DW_CFA_undefined: |
| 638 | case DW_CFA_same_value: |
| 639 | case DW_CFA_nop: |
| 640 | break; |
| 641 | |
| 642 | case DW_CFA_register: |
| 643 | { |
| 644 | ULONGEST reg2; |
| 645 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 646 | reg2 = read_uleb128 (objfile->obfd, &insn_ptr); |
| 647 | fs->regs.reg[reg].how = REG_SAVED_REG; |
| 648 | fs->regs.reg[reg].loc.reg = reg2; |
| 649 | } |
| 650 | break; |
| 651 | |
| 652 | case DW_CFA_remember_state: |
| 653 | { |
| 654 | struct frame_state_regs *new_rs; |
| 655 | if (unused_rs) |
| 656 | { |
| 657 | new_rs = unused_rs; |
| 658 | unused_rs = unused_rs->prev; |
| 659 | } |
| 660 | else |
| 661 | new_rs = xmalloc (sizeof (struct frame_state_regs)); |
| 662 | |
| 663 | *new_rs = fs->regs; |
| 664 | fs->regs.prev = new_rs; |
| 665 | } |
| 666 | break; |
| 667 | |
| 668 | case DW_CFA_restore_state: |
| 669 | { |
| 670 | struct frame_state_regs *old_rs = fs->regs.prev; |
| 671 | fs->regs = *old_rs; |
| 672 | old_rs->prev = unused_rs; |
| 673 | unused_rs = old_rs; |
| 674 | } |
| 675 | break; |
| 676 | |
| 677 | case DW_CFA_def_cfa: |
| 678 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 679 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 680 | fs->cfa_reg = reg; |
| 681 | fs->cfa_offset = uoffset; |
| 682 | fs->cfa_how = CFA_REG_OFFSET; |
| 683 | break; |
| 684 | |
| 685 | case DW_CFA_def_cfa_register: |
| 686 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 687 | fs->cfa_reg = reg; |
| 688 | fs->cfa_how = CFA_REG_OFFSET; |
| 689 | break; |
| 690 | |
| 691 | case DW_CFA_def_cfa_offset: |
| 692 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 693 | fs->cfa_offset = uoffset; |
| 694 | break; |
| 695 | |
| 696 | case DW_CFA_def_cfa_expression: |
| 697 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 698 | fs->cfa_exp = insn_ptr; |
| 699 | fs->cfa_how = CFA_EXP; |
| 700 | insn_ptr += uoffset; |
| 701 | break; |
| 702 | |
| 703 | case DW_CFA_expression: |
| 704 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 705 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 706 | fs->regs.reg[reg].how = REG_SAVED_EXP; |
| 707 | fs->regs.reg[reg].loc.exp = insn_ptr; |
| 708 | insn_ptr += uoffset; |
| 709 | break; |
| 710 | |
| 711 | /* From the 2.1 draft. */ |
| 712 | case DW_CFA_offset_extended_sf: |
| 713 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 714 | offset = read_sleb128 (objfile->obfd, &insn_ptr); |
| 715 | offset *= fs->data_align; |
| 716 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
| 717 | fs->regs.reg[reg].loc.offset = offset; |
| 718 | break; |
| 719 | |
| 720 | case DW_CFA_def_cfa_sf: |
| 721 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 722 | offset = read_sleb128 (objfile->obfd, &insn_ptr); |
| 723 | fs->cfa_offset = offset; |
| 724 | fs->cfa_reg = reg; |
| 725 | fs->cfa_how = CFA_REG_OFFSET; |
| 726 | break; |
| 727 | |
| 728 | case DW_CFA_def_cfa_offset_sf: |
| 729 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 730 | fs->cfa_offset = uoffset; |
| 731 | /* cfa_how deliberately not set. */ |
| 732 | break; |
| 733 | |
| 734 | case DW_CFA_GNU_window_save: |
| 735 | /* ??? Hardcoded for SPARC register window configuration. */ |
| 736 | for (reg = 16; reg < 32; ++reg) |
| 737 | { |
| 738 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
| 739 | fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *); |
| 740 | } |
| 741 | break; |
| 742 | |
| 743 | case DW_CFA_GNU_args_size: |
| 744 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 745 | context->args_size = uoffset; |
| 746 | break; |
| 747 | |
| 748 | case DW_CFA_GNU_negative_offset_extended: |
| 749 | /* Obsoleted by DW_CFA_offset_extended_sf, but used by |
| 750 | older PowerPC code. */ |
| 751 | reg = read_uleb128 (objfile->obfd, &insn_ptr); |
| 752 | uoffset = read_uleb128 (objfile->obfd, &insn_ptr); |
| 753 | offset = (long) uoffset *fs->data_align; |
| 754 | fs->regs.reg[reg].how = REG_SAVED_OFFSET; |
| 755 | fs->regs.reg[reg].loc.offset = -offset; |
| 756 | break; |
| 757 | |
| 758 | default: |
| 759 | error ("dwarf cfi error: unknown cfa instruction %d.", insn); |
| 760 | } |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | static struct fde_unit * |
| 765 | get_fde_for_addr (CORE_ADDR pc) |
| 766 | { |
| 767 | size_t lo, hi; |
| 768 | struct fde_unit *fde = NULL; |
| 769 | lo = 0; |
| 770 | hi = fde_chunks.elems; |
| 771 | |
| 772 | while (lo < hi) |
| 773 | { |
| 774 | size_t i = (lo + hi) / 2; |
| 775 | fde = fde_chunks.array[i]; |
| 776 | if (pc < fde->initial_location) |
| 777 | hi = i; |
| 778 | else if (pc >= fde->initial_location + fde->address_range) |
| 779 | lo = i + 1; |
| 780 | else |
| 781 | return fde; |
| 782 | } |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | static void |
| 787 | frame_state_for (struct context *context, struct frame_state *fs) |
| 788 | { |
| 789 | struct fde_unit *fde; |
| 790 | struct cie_unit *cie; |
| 791 | unsigned char *aug, *insn, *end; |
| 792 | |
| 793 | context->args_size = 0; |
| 794 | context->lsda = 0; |
| 795 | |
| 796 | if ((fde = get_fde_for_addr (context->ra - 1)) != NULL) |
| 797 | { |
| 798 | fs->pc = fde->initial_location; |
| 799 | |
| 800 | cie = fde->cie_ptr; |
| 801 | fs->code_align = cie->code_align; |
| 802 | fs->data_align = cie->data_align; |
| 803 | fs->retaddr_column = cie->ra; |
| 804 | fs->addr_encoding = cie->addr_encoding; |
| 805 | fs->objfile = cie->objfile; |
| 806 | |
| 807 | execute_cfa_program (cie->objfile, cie->data, |
| 808 | cie->data + cie->data_length, context, fs); |
| 809 | execute_cfa_program (cie->objfile, fde->data, |
| 810 | fde->data + fde->data_length, context, fs); |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | static void |
| 815 | get_reg (char *reg, struct context *context, int regnum) |
| 816 | { |
| 817 | switch (context->reg[regnum].how) |
| 818 | { |
| 819 | case REG_CTX_UNSAVED: |
| 820 | read_register_gen (regnum, reg); |
| 821 | break; |
| 822 | case REG_CTX_SAVED_OFFSET: |
| 823 | target_read_memory (context->cfa + context->reg[regnum].loc.offset, |
| 824 | reg, REGISTER_RAW_SIZE (regnum)); |
| 825 | break; |
| 826 | case REG_CTX_SAVED_REG: |
| 827 | read_register_gen (context->reg[regnum].loc.reg, reg); |
| 828 | break; |
| 829 | case REG_CTX_SAVED_ADDR: |
| 830 | target_read_memory (context->reg[regnum].loc.addr, |
| 831 | reg, REGISTER_RAW_SIZE (regnum)); |
| 832 | break; |
| 833 | case REG_CTX_VALUE: |
| 834 | memcpy (reg, &context->reg[regnum].loc.addr, |
| 835 | REGISTER_RAW_SIZE (regnum)); |
| 836 | break; |
| 837 | default: |
| 838 | internal_error (__FILE__, __LINE__, |
| 839 | "get_reg: unknown register rule"); |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | /* Decode a DW_OP stack program. Return the top of stack. Push INITIAL |
| 844 | onto the stack to start. */ |
| 845 | static CORE_ADDR |
| 846 | execute_stack_op (struct objfile *objfile, |
| 847 | char *op_ptr, char *op_end, struct context *context, |
| 848 | CORE_ADDR initial) |
| 849 | { |
| 850 | CORE_ADDR stack[64]; /* ??? Assume this is enough. */ |
| 851 | int stack_elt; |
| 852 | |
| 853 | stack[0] = initial; |
| 854 | stack_elt = 1; |
| 855 | |
| 856 | while (op_ptr < op_end) |
| 857 | { |
| 858 | enum dwarf_location_atom op = *op_ptr++; |
| 859 | ULONGEST result, reg; |
| 860 | LONGEST offset; |
| 861 | |
| 862 | switch (op) |
| 863 | { |
| 864 | case DW_OP_lit0: |
| 865 | case DW_OP_lit1: |
| 866 | case DW_OP_lit2: |
| 867 | case DW_OP_lit3: |
| 868 | case DW_OP_lit4: |
| 869 | case DW_OP_lit5: |
| 870 | case DW_OP_lit6: |
| 871 | case DW_OP_lit7: |
| 872 | case DW_OP_lit8: |
| 873 | case DW_OP_lit9: |
| 874 | case DW_OP_lit10: |
| 875 | case DW_OP_lit11: |
| 876 | case DW_OP_lit12: |
| 877 | case DW_OP_lit13: |
| 878 | case DW_OP_lit14: |
| 879 | case DW_OP_lit15: |
| 880 | case DW_OP_lit16: |
| 881 | case DW_OP_lit17: |
| 882 | case DW_OP_lit18: |
| 883 | case DW_OP_lit19: |
| 884 | case DW_OP_lit20: |
| 885 | case DW_OP_lit21: |
| 886 | case DW_OP_lit22: |
| 887 | case DW_OP_lit23: |
| 888 | case DW_OP_lit24: |
| 889 | case DW_OP_lit25: |
| 890 | case DW_OP_lit26: |
| 891 | case DW_OP_lit27: |
| 892 | case DW_OP_lit28: |
| 893 | case DW_OP_lit29: |
| 894 | case DW_OP_lit30: |
| 895 | case DW_OP_lit31: |
| 896 | result = op - DW_OP_lit0; |
| 897 | break; |
| 898 | |
| 899 | case DW_OP_addr: |
| 900 | result = read_pointer (objfile->obfd, &op_ptr); |
| 901 | break; |
| 902 | |
| 903 | case DW_OP_const1u: |
| 904 | result = read_1u (objfile->obfd, &op_ptr); |
| 905 | break; |
| 906 | case DW_OP_const1s: |
| 907 | result = read_1s (objfile->obfd, &op_ptr); |
| 908 | break; |
| 909 | case DW_OP_const2u: |
| 910 | result = read_2u (objfile->obfd, &op_ptr); |
| 911 | break; |
| 912 | case DW_OP_const2s: |
| 913 | result = read_2s (objfile->obfd, &op_ptr); |
| 914 | break; |
| 915 | case DW_OP_const4u: |
| 916 | result = read_4u (objfile->obfd, &op_ptr); |
| 917 | break; |
| 918 | case DW_OP_const4s: |
| 919 | result = read_4s (objfile->obfd, &op_ptr); |
| 920 | break; |
| 921 | case DW_OP_const8u: |
| 922 | result = read_8u (objfile->obfd, &op_ptr); |
| 923 | break; |
| 924 | case DW_OP_const8s: |
| 925 | result = read_8s (objfile->obfd, &op_ptr); |
| 926 | break; |
| 927 | case DW_OP_constu: |
| 928 | result = read_uleb128 (objfile->obfd, &op_ptr); |
| 929 | break; |
| 930 | case DW_OP_consts: |
| 931 | result = read_sleb128 (objfile->obfd, &op_ptr); |
| 932 | break; |
| 933 | |
| 934 | case DW_OP_reg0: |
| 935 | case DW_OP_reg1: |
| 936 | case DW_OP_reg2: |
| 937 | case DW_OP_reg3: |
| 938 | case DW_OP_reg4: |
| 939 | case DW_OP_reg5: |
| 940 | case DW_OP_reg6: |
| 941 | case DW_OP_reg7: |
| 942 | case DW_OP_reg8: |
| 943 | case DW_OP_reg9: |
| 944 | case DW_OP_reg10: |
| 945 | case DW_OP_reg11: |
| 946 | case DW_OP_reg12: |
| 947 | case DW_OP_reg13: |
| 948 | case DW_OP_reg14: |
| 949 | case DW_OP_reg15: |
| 950 | case DW_OP_reg16: |
| 951 | case DW_OP_reg17: |
| 952 | case DW_OP_reg18: |
| 953 | case DW_OP_reg19: |
| 954 | case DW_OP_reg20: |
| 955 | case DW_OP_reg21: |
| 956 | case DW_OP_reg22: |
| 957 | case DW_OP_reg23: |
| 958 | case DW_OP_reg24: |
| 959 | case DW_OP_reg25: |
| 960 | case DW_OP_reg26: |
| 961 | case DW_OP_reg27: |
| 962 | case DW_OP_reg28: |
| 963 | case DW_OP_reg29: |
| 964 | case DW_OP_reg30: |
| 965 | case DW_OP_reg31: |
| 966 | get_reg ((char *) &result, context, op - DW_OP_reg0); |
| 967 | break; |
| 968 | case DW_OP_regx: |
| 969 | reg = read_uleb128 (objfile->obfd, &op_ptr); |
| 970 | get_reg ((char *) &result, context, reg); |
| 971 | break; |
| 972 | |
| 973 | case DW_OP_breg0: |
| 974 | case DW_OP_breg1: |
| 975 | case DW_OP_breg2: |
| 976 | case DW_OP_breg3: |
| 977 | case DW_OP_breg4: |
| 978 | case DW_OP_breg5: |
| 979 | case DW_OP_breg6: |
| 980 | case DW_OP_breg7: |
| 981 | case DW_OP_breg8: |
| 982 | case DW_OP_breg9: |
| 983 | case DW_OP_breg10: |
| 984 | case DW_OP_breg11: |
| 985 | case DW_OP_breg12: |
| 986 | case DW_OP_breg13: |
| 987 | case DW_OP_breg14: |
| 988 | case DW_OP_breg15: |
| 989 | case DW_OP_breg16: |
| 990 | case DW_OP_breg17: |
| 991 | case DW_OP_breg18: |
| 992 | case DW_OP_breg19: |
| 993 | case DW_OP_breg20: |
| 994 | case DW_OP_breg21: |
| 995 | case DW_OP_breg22: |
| 996 | case DW_OP_breg23: |
| 997 | case DW_OP_breg24: |
| 998 | case DW_OP_breg25: |
| 999 | case DW_OP_breg26: |
| 1000 | case DW_OP_breg27: |
| 1001 | case DW_OP_breg28: |
| 1002 | case DW_OP_breg29: |
| 1003 | case DW_OP_breg30: |
| 1004 | case DW_OP_breg31: |
| 1005 | offset = read_sleb128 (objfile->obfd, &op_ptr); |
| 1006 | get_reg ((char *) &result, context, op - DW_OP_breg0); |
| 1007 | result += offset; |
| 1008 | break; |
| 1009 | case DW_OP_bregx: |
| 1010 | reg = read_uleb128 (objfile->obfd, &op_ptr); |
| 1011 | offset = read_sleb128 (objfile->obfd, &op_ptr); |
| 1012 | get_reg ((char *) &result, context, reg); |
| 1013 | result += offset; |
| 1014 | break; |
| 1015 | |
| 1016 | case DW_OP_dup: |
| 1017 | if (stack_elt < 1) |
| 1018 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1019 | result = stack[stack_elt - 1]; |
| 1020 | break; |
| 1021 | |
| 1022 | case DW_OP_drop: |
| 1023 | if (--stack_elt < 0) |
| 1024 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1025 | goto no_push; |
| 1026 | |
| 1027 | case DW_OP_pick: |
| 1028 | offset = *op_ptr++; |
| 1029 | if (offset >= stack_elt - 1) |
| 1030 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1031 | result = stack[stack_elt - 1 - offset]; |
| 1032 | break; |
| 1033 | |
| 1034 | case DW_OP_over: |
| 1035 | if (stack_elt < 2) |
| 1036 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1037 | result = stack[stack_elt - 2]; |
| 1038 | break; |
| 1039 | |
| 1040 | case DW_OP_rot: |
| 1041 | { |
| 1042 | CORE_ADDR t1, t2, t3; |
| 1043 | |
| 1044 | if (stack_elt < 3) |
| 1045 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1046 | t1 = stack[stack_elt - 1]; |
| 1047 | t2 = stack[stack_elt - 2]; |
| 1048 | t3 = stack[stack_elt - 3]; |
| 1049 | stack[stack_elt - 1] = t2; |
| 1050 | stack[stack_elt - 2] = t3; |
| 1051 | stack[stack_elt - 3] = t1; |
| 1052 | goto no_push; |
| 1053 | } |
| 1054 | |
| 1055 | case DW_OP_deref: |
| 1056 | case DW_OP_deref_size: |
| 1057 | case DW_OP_abs: |
| 1058 | case DW_OP_neg: |
| 1059 | case DW_OP_not: |
| 1060 | case DW_OP_plus_uconst: |
| 1061 | /* Unary operations. */ |
| 1062 | if (--stack_elt < 0) |
| 1063 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1064 | result = stack[stack_elt]; |
| 1065 | |
| 1066 | switch (op) |
| 1067 | { |
| 1068 | case DW_OP_deref: |
| 1069 | { |
| 1070 | char *ptr = (char *) result; |
| 1071 | result = read_pointer (objfile->obfd, &ptr); |
| 1072 | } |
| 1073 | break; |
| 1074 | |
| 1075 | case DW_OP_deref_size: |
| 1076 | { |
| 1077 | char *ptr = (char *) result; |
| 1078 | switch (*op_ptr++) |
| 1079 | { |
| 1080 | case 1: |
| 1081 | result = read_1u (objfile->obfd, &ptr); |
| 1082 | break; |
| 1083 | case 2: |
| 1084 | result = read_2u (objfile->obfd, &ptr); |
| 1085 | break; |
| 1086 | case 4: |
| 1087 | result = read_4u (objfile->obfd, &ptr); |
| 1088 | break; |
| 1089 | case 8: |
| 1090 | result = read_8u (objfile->obfd, &ptr); |
| 1091 | break; |
| 1092 | default: |
| 1093 | internal_error (__FILE__, __LINE__, |
| 1094 | "execute_stack_op error"); |
| 1095 | } |
| 1096 | } |
| 1097 | break; |
| 1098 | |
| 1099 | case DW_OP_abs: |
| 1100 | if (result < 0) |
| 1101 | result = -result; |
| 1102 | break; |
| 1103 | case DW_OP_neg: |
| 1104 | result = -result; |
| 1105 | break; |
| 1106 | case DW_OP_not: |
| 1107 | result = ~result; |
| 1108 | break; |
| 1109 | case DW_OP_plus_uconst: |
| 1110 | result += read_uleb128 (objfile->obfd, &op_ptr); |
| 1111 | break; |
| 1112 | } |
| 1113 | break; |
| 1114 | |
| 1115 | case DW_OP_and: |
| 1116 | case DW_OP_div: |
| 1117 | case DW_OP_minus: |
| 1118 | case DW_OP_mod: |
| 1119 | case DW_OP_mul: |
| 1120 | case DW_OP_or: |
| 1121 | case DW_OP_plus: |
| 1122 | case DW_OP_le: |
| 1123 | case DW_OP_ge: |
| 1124 | case DW_OP_eq: |
| 1125 | case DW_OP_lt: |
| 1126 | case DW_OP_gt: |
| 1127 | case DW_OP_ne: |
| 1128 | { |
| 1129 | /* Binary operations. */ |
| 1130 | CORE_ADDR first, second; |
| 1131 | if ((stack_elt -= 2) < 0) |
| 1132 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1133 | second = stack[stack_elt]; |
| 1134 | first = stack[stack_elt + 1]; |
| 1135 | |
| 1136 | switch (op) |
| 1137 | { |
| 1138 | case DW_OP_and: |
| 1139 | result = second & first; |
| 1140 | break; |
| 1141 | case DW_OP_div: |
| 1142 | result = (LONGEST) second / (LONGEST) first; |
| 1143 | break; |
| 1144 | case DW_OP_minus: |
| 1145 | result = second - first; |
| 1146 | break; |
| 1147 | case DW_OP_mod: |
| 1148 | result = (LONGEST) second % (LONGEST) first; |
| 1149 | break; |
| 1150 | case DW_OP_mul: |
| 1151 | result = second * first; |
| 1152 | break; |
| 1153 | case DW_OP_or: |
| 1154 | result = second | first; |
| 1155 | break; |
| 1156 | case DW_OP_plus: |
| 1157 | result = second + first; |
| 1158 | break; |
| 1159 | case DW_OP_shl: |
| 1160 | result = second << first; |
| 1161 | break; |
| 1162 | case DW_OP_shr: |
| 1163 | result = second >> first; |
| 1164 | break; |
| 1165 | case DW_OP_shra: |
| 1166 | result = (LONGEST) second >> first; |
| 1167 | break; |
| 1168 | case DW_OP_xor: |
| 1169 | result = second ^ first; |
| 1170 | break; |
| 1171 | case DW_OP_le: |
| 1172 | result = (LONGEST) first <= (LONGEST) second; |
| 1173 | break; |
| 1174 | case DW_OP_ge: |
| 1175 | result = (LONGEST) first >= (LONGEST) second; |
| 1176 | break; |
| 1177 | case DW_OP_eq: |
| 1178 | result = (LONGEST) first == (LONGEST) second; |
| 1179 | break; |
| 1180 | case DW_OP_lt: |
| 1181 | result = (LONGEST) first < (LONGEST) second; |
| 1182 | break; |
| 1183 | case DW_OP_gt: |
| 1184 | result = (LONGEST) first > (LONGEST) second; |
| 1185 | break; |
| 1186 | case DW_OP_ne: |
| 1187 | result = (LONGEST) first != (LONGEST) second; |
| 1188 | break; |
| 1189 | } |
| 1190 | } |
| 1191 | break; |
| 1192 | |
| 1193 | case DW_OP_skip: |
| 1194 | offset = read_2s (objfile->obfd, &op_ptr); |
| 1195 | op_ptr += offset; |
| 1196 | goto no_push; |
| 1197 | |
| 1198 | case DW_OP_bra: |
| 1199 | if (--stack_elt < 0) |
| 1200 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1201 | offset = read_2s (objfile->obfd, &op_ptr); |
| 1202 | if (stack[stack_elt] != 0) |
| 1203 | op_ptr += offset; |
| 1204 | goto no_push; |
| 1205 | |
| 1206 | case DW_OP_nop: |
| 1207 | goto no_push; |
| 1208 | |
| 1209 | default: |
| 1210 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1211 | } |
| 1212 | |
| 1213 | /* Most things push a result value. */ |
| 1214 | if ((size_t) stack_elt >= sizeof (stack) / sizeof (*stack)) |
| 1215 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1216 | stack[++stack_elt] = result; |
| 1217 | no_push:; |
| 1218 | } |
| 1219 | |
| 1220 | /* We were executing this program to get a value. It should be |
| 1221 | at top of stack. */ |
| 1222 | if (--stack_elt < 0) |
| 1223 | internal_error (__FILE__, __LINE__, "execute_stack_op error"); |
| 1224 | return stack[stack_elt]; |
| 1225 | } |
| 1226 | |
| 1227 | static void |
| 1228 | update_context (struct context *context, struct frame_state *fs, int chain) |
| 1229 | { |
| 1230 | struct context *orig_context; |
| 1231 | CORE_ADDR cfa; |
| 1232 | long i; |
| 1233 | |
| 1234 | orig_context = context_alloc (); |
| 1235 | context_cpy (orig_context, context); |
| 1236 | /* Compute this frame's CFA. */ |
| 1237 | switch (fs->cfa_how) |
| 1238 | { |
| 1239 | case CFA_REG_OFFSET: |
| 1240 | get_reg ((char *) &cfa, context, fs->cfa_reg); |
| 1241 | cfa += fs->cfa_offset; |
| 1242 | break; |
| 1243 | |
| 1244 | case CFA_EXP: |
| 1245 | /* ??? No way of knowing what register number is the stack pointer |
| 1246 | to do the same sort of handling as above. Assume that if the |
| 1247 | CFA calculation is so complicated as to require a stack program |
| 1248 | that this will not be a problem. */ |
| 1249 | { |
| 1250 | char *exp = fs->cfa_exp; |
| 1251 | ULONGEST len; |
| 1252 | |
| 1253 | len = read_uleb128 (fs->objfile->obfd, &exp); |
| 1254 | cfa = (CORE_ADDR) execute_stack_op (fs->objfile, exp, |
| 1255 | exp + len, context, 0); |
| 1256 | break; |
| 1257 | } |
| 1258 | } |
| 1259 | context->cfa = cfa; |
| 1260 | |
| 1261 | if (!chain) |
| 1262 | orig_context->cfa = cfa; |
| 1263 | |
| 1264 | /* Compute the addresses of all registers saved in this frame. */ |
| 1265 | for (i = 0; i < NUM_REGS; ++i) |
| 1266 | switch (fs->regs.reg[i].how) |
| 1267 | { |
| 1268 | case REG_UNSAVED: |
| 1269 | if (i == SP_REGNUM) |
| 1270 | { |
| 1271 | context->reg[i].how = REG_CTX_VALUE; |
| 1272 | context->reg[i].loc.addr = cfa; |
| 1273 | } |
| 1274 | else |
| 1275 | context->reg[i].how = REG_CTX_UNSAVED; |
| 1276 | break; |
| 1277 | case REG_SAVED_OFFSET: |
| 1278 | context->reg[i].how = REG_CTX_SAVED_OFFSET; |
| 1279 | context->reg[i].loc.offset = fs->regs.reg[i].loc.offset; |
| 1280 | break; |
| 1281 | case REG_SAVED_REG: |
| 1282 | switch (orig_context->reg[fs->regs.reg[i].loc.reg].how) |
| 1283 | { |
| 1284 | case REG_CTX_UNSAVED: |
| 1285 | context->reg[i].how = REG_CTX_UNSAVED; |
| 1286 | break; |
| 1287 | case REG_CTX_SAVED_OFFSET: |
| 1288 | context->reg[i].how = REG_CTX_SAVED_OFFSET; |
| 1289 | context->reg[i].loc.offset = orig_context->cfa - context->cfa + |
| 1290 | orig_context->reg[fs->regs.reg[i].loc.reg].loc.offset; |
| 1291 | break; |
| 1292 | case REG_CTX_SAVED_REG: |
| 1293 | context->reg[i].how = REG_CTX_SAVED_REG; |
| 1294 | context->reg[i].loc.reg = |
| 1295 | orig_context->reg[fs->regs.reg[i].loc.reg].loc.reg; |
| 1296 | break; |
| 1297 | case REG_CTX_SAVED_ADDR: |
| 1298 | context->reg[i].how = REG_CTX_SAVED_ADDR; |
| 1299 | context->reg[i].loc.addr = |
| 1300 | orig_context->reg[fs->regs.reg[i].loc.reg].loc.addr; |
| 1301 | default: |
| 1302 | internal_error (__FILE__, __LINE__, |
| 1303 | "cfi_update_context: unknown register rule"); |
| 1304 | } |
| 1305 | break; |
| 1306 | case REG_SAVED_EXP: |
| 1307 | { |
| 1308 | char *exp = fs->regs.reg[i].loc.exp; |
| 1309 | ULONGEST len; |
| 1310 | CORE_ADDR val; |
| 1311 | |
| 1312 | len = read_uleb128 (fs->objfile->obfd, &exp); |
| 1313 | val = execute_stack_op (fs->objfile, exp, exp + len, |
| 1314 | orig_context, cfa); |
| 1315 | context->reg[i].how = REG_CTX_SAVED_ADDR; |
| 1316 | context->reg[i].loc.addr = val; |
| 1317 | } |
| 1318 | break; |
| 1319 | default: |
| 1320 | internal_error (__FILE__, __LINE__, |
| 1321 | "cfi_update_context: unknown register rule"); |
| 1322 | |
| 1323 | } |
| 1324 | get_reg ((char *) &context->ra, context, fs->retaddr_column); |
| 1325 | unwind_tmp_obstack_free (); |
| 1326 | } |
| 1327 | |
| 1328 | static int |
| 1329 | is_cie (ULONGEST cie_id, int dwarf64) |
| 1330 | { |
| 1331 | return dwarf64 ? (cie_id == 0xffffffffffffffff) : (cie_id == 0xffffffff); |
| 1332 | } |
| 1333 | |
| 1334 | static int |
| 1335 | compare_fde_unit (const void *a, const void *b) |
| 1336 | { |
| 1337 | struct fde_unit **first, **second; |
| 1338 | first = (struct fde_unit **) a; |
| 1339 | second = (struct fde_unit **) b; |
| 1340 | if ((*first)->initial_location > (*second)->initial_location) |
| 1341 | return 1; |
| 1342 | else if ((*first)->initial_location < (*second)->initial_location) |
| 1343 | return -1; |
| 1344 | else |
| 1345 | return 0; |
| 1346 | } |
| 1347 | |
| 1348 | /* Build the cie_chunks and fde_chunks tables from informations |
| 1349 | in .debug.frame section. */ |
| 1350 | void |
| 1351 | dwarf2_build_frame_info (struct objfile *objfile) |
| 1352 | { |
| 1353 | bfd *abfd = objfile->obfd; |
| 1354 | char *start = NULL; |
| 1355 | char *end = NULL; |
| 1356 | |
| 1357 | obstack_init (&unwind_tmp_obstack); |
| 1358 | |
| 1359 | dwarf_frame_buffer = 0; |
| 1360 | |
| 1361 | if (dwarf_frame_offset) |
| 1362 | { |
| 1363 | dwarf_frame_buffer = dwarf2_read_section (objfile, |
| 1364 | dwarf_frame_offset, |
| 1365 | dwarf_frame_size); |
| 1366 | |
| 1367 | start = dwarf_frame_buffer; |
| 1368 | end = dwarf_frame_buffer + dwarf_frame_size; |
| 1369 | } |
| 1370 | else if (dwarf_eh_frame_offset) |
| 1371 | { |
| 1372 | dwarf_frame_buffer = dwarf2_read_section (objfile, |
| 1373 | dwarf_eh_frame_offset, |
| 1374 | dwarf_eh_frame_size); |
| 1375 | |
| 1376 | start = dwarf_frame_buffer; |
| 1377 | end = dwarf_frame_buffer + dwarf_eh_frame_size; |
| 1378 | } |
| 1379 | |
| 1380 | if (start) |
| 1381 | { |
| 1382 | while (start < end) |
| 1383 | { |
| 1384 | unsigned long length; |
| 1385 | ULONGEST cie_id; |
| 1386 | ULONGEST unit_offset = start - dwarf_frame_buffer; |
| 1387 | int bytes_read; |
| 1388 | int dwarf64; |
| 1389 | char *block_end; |
| 1390 | |
| 1391 | length = read_initial_length (abfd, start, &bytes_read); |
| 1392 | start += bytes_read; |
| 1393 | dwarf64 = (bytes_read == 12); |
| 1394 | block_end = start + length; |
| 1395 | |
| 1396 | cie_id = read_length (abfd, start, &bytes_read, dwarf64); |
| 1397 | start += bytes_read; |
| 1398 | |
| 1399 | if (is_cie (cie_id, dwarf64)) |
| 1400 | { |
| 1401 | struct cie_unit *cie = cie_unit_alloc (); |
| 1402 | char *aug; |
| 1403 | |
| 1404 | cie->objfile = objfile; |
| 1405 | cie->next = cie_chunks; |
| 1406 | cie_chunks = cie; |
| 1407 | |
| 1408 | cie->objfile = objfile; |
| 1409 | |
| 1410 | cie->offset = unit_offset; |
| 1411 | |
| 1412 | start++; /* version */ |
| 1413 | |
| 1414 | cie->augmentation = aug = start; |
| 1415 | while (*start) |
| 1416 | start++; |
| 1417 | start++; /* skip past NUL */ |
| 1418 | |
| 1419 | cie->code_align = read_uleb128 (abfd, &start); |
| 1420 | cie->data_align = read_sleb128 (abfd, &start); |
| 1421 | cie->ra = read_1u (abfd, &start); |
| 1422 | |
| 1423 | if (*aug == 'z') |
| 1424 | { |
| 1425 | int xtra = read_uleb128 (abfd, &start); |
| 1426 | start += xtra; |
| 1427 | ++aug; |
| 1428 | } |
| 1429 | |
| 1430 | while (*aug != '\0') |
| 1431 | { |
| 1432 | if (aug[0] == 'e' && aug[1] == 'h') |
| 1433 | { |
| 1434 | start += sizeof (void *); |
| 1435 | aug += 2; |
| 1436 | } |
| 1437 | else if (aug[0] == 'R') |
| 1438 | { |
| 1439 | cie->addr_encoding = *start++; |
| 1440 | aug += 1; |
| 1441 | } |
| 1442 | else if (aug[0] == 'P') |
| 1443 | { |
| 1444 | CORE_ADDR ptr; |
| 1445 | ptr = read_encoded_pointer (abfd, &start, |
| 1446 | cie->addr_encoding); |
| 1447 | aug += 1; |
| 1448 | } |
| 1449 | else |
| 1450 | warning ("unknown augmentation"); |
| 1451 | } |
| 1452 | |
| 1453 | cie->data = start; |
| 1454 | cie->data_length = block_end - start; |
| 1455 | } |
| 1456 | else |
| 1457 | { |
| 1458 | struct fde_unit *fde; |
| 1459 | struct cie_unit *cie; |
| 1460 | |
| 1461 | fde_chunks_need_space (); |
| 1462 | fde = fde_unit_alloc (); |
| 1463 | |
| 1464 | fde_chunks.array[fde_chunks.elems++] = fde; |
| 1465 | fde->initial_location = read_pointer (abfd, &start); |
| 1466 | fde->address_range = read_pointer (abfd, &start); |
| 1467 | |
| 1468 | for (cie = cie_chunks; |
| 1469 | cie && (cie->offset != cie_id); cie = cie->next); |
| 1470 | if (!cie) |
| 1471 | error ("dwarf cfi error: can't find CIE pointer"); |
| 1472 | fde->cie_ptr = cie; |
| 1473 | |
| 1474 | if (cie->augmentation[0] == 'z') |
| 1475 | read_uleb128 (abfd, &start); |
| 1476 | |
| 1477 | fde->data = start; |
| 1478 | fde->data_length = block_end - start; |
| 1479 | } |
| 1480 | start = block_end; |
| 1481 | } |
| 1482 | qsort (fde_chunks.array, fde_chunks.elems, |
| 1483 | sizeof (struct fde_unit *), compare_fde_unit); |
| 1484 | } |
| 1485 | } |
| 1486 | \f |
| 1487 | |
| 1488 | /* Return the frame address. */ |
| 1489 | CORE_ADDR |
| 1490 | cfi_read_fp () |
| 1491 | { |
| 1492 | struct context *context; |
| 1493 | struct frame_state *fs; |
| 1494 | CORE_ADDR cfa; |
| 1495 | |
| 1496 | context = context_alloc (); |
| 1497 | fs = frame_state_alloc (); |
| 1498 | |
| 1499 | context->ra = read_pc () + 1; |
| 1500 | |
| 1501 | frame_state_for (context, fs); |
| 1502 | update_context (context, fs, 0); |
| 1503 | |
| 1504 | cfa = context->cfa; |
| 1505 | unwind_tmp_obstack_free (); |
| 1506 | return cfa; |
| 1507 | } |
| 1508 | |
| 1509 | /* Store the frame address. This function is not used. */ |
| 1510 | |
| 1511 | void |
| 1512 | cfi_write_fp (CORE_ADDR val) |
| 1513 | { |
| 1514 | struct context *context; |
| 1515 | struct frame_state *fs; |
| 1516 | |
| 1517 | context = context_alloc (); |
| 1518 | fs = frame_state_alloc (); |
| 1519 | |
| 1520 | context->ra = read_pc () + 1; |
| 1521 | |
| 1522 | frame_state_for (context, fs); |
| 1523 | |
| 1524 | if (fs->cfa_how == CFA_REG_OFFSET) |
| 1525 | { |
| 1526 | val -= fs->cfa_offset; |
| 1527 | write_register_gen (fs->cfa_reg, (char *) &val); |
| 1528 | } |
| 1529 | else |
| 1530 | warning ("Can't write fp."); |
| 1531 | |
| 1532 | unwind_tmp_obstack_free (); |
| 1533 | } |
| 1534 | |
| 1535 | /* Restore the machine to the state it had before the current frame |
| 1536 | was created. */ |
| 1537 | void |
| 1538 | cfi_pop_frame (struct frame_info *fi) |
| 1539 | { |
| 1540 | char regbuf[MAX_REGISTER_RAW_SIZE]; |
| 1541 | int regnum; |
| 1542 | |
| 1543 | fi = get_current_frame (); |
| 1544 | |
| 1545 | for (regnum = 0; regnum < NUM_REGS; regnum++) |
| 1546 | { |
| 1547 | get_reg (regbuf, UNWIND_CONTEXT (fi), regnum); |
| 1548 | write_register_bytes (REGISTER_BYTE (regnum), regbuf, |
| 1549 | REGISTER_RAW_SIZE (regnum)); |
| 1550 | } |
| 1551 | write_register (PC_REGNUM, UNWIND_CONTEXT (fi)->ra); |
| 1552 | |
| 1553 | flush_cached_frames (); |
| 1554 | } |
| 1555 | |
| 1556 | /* Determine the address of the calling function's frame. */ |
| 1557 | CORE_ADDR |
| 1558 | cfi_frame_chain (struct frame_info *fi) |
| 1559 | { |
| 1560 | struct context *context; |
| 1561 | struct frame_state *fs; |
| 1562 | CORE_ADDR cfa; |
| 1563 | |
| 1564 | context = context_alloc (); |
| 1565 | fs = frame_state_alloc (); |
| 1566 | context_cpy (context, UNWIND_CONTEXT (fi)); |
| 1567 | |
| 1568 | /* outermost frame */ |
| 1569 | if (context->ra == 0) |
| 1570 | { |
| 1571 | unwind_tmp_obstack_free (); |
| 1572 | return 0; |
| 1573 | } |
| 1574 | |
| 1575 | frame_state_for (context, fs); |
| 1576 | update_context (context, fs, 1); |
| 1577 | |
| 1578 | cfa = context->cfa; |
| 1579 | unwind_tmp_obstack_free (); |
| 1580 | return cfa; |
| 1581 | } |
| 1582 | |
| 1583 | /* Sets the pc of the frame. */ |
| 1584 | void |
| 1585 | cfi_init_frame_pc (int fromleaf, struct frame_info *fi) |
| 1586 | { |
| 1587 | if (fi->next) |
| 1588 | get_reg ((char *) &(fi->pc), UNWIND_CONTEXT (fi->next), PC_REGNUM); |
| 1589 | else |
| 1590 | fi->pc = read_pc (); |
| 1591 | } |
| 1592 | |
| 1593 | /* Initialize unwind context informations of the frame. */ |
| 1594 | void |
| 1595 | cfi_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| 1596 | { |
| 1597 | struct frame_state *fs; |
| 1598 | |
| 1599 | fs = frame_state_alloc (); |
| 1600 | fi->context = frame_obstack_alloc (sizeof (struct context)); |
| 1601 | UNWIND_CONTEXT (fi)->reg = |
| 1602 | frame_obstack_alloc (sizeof (struct context_reg) * NUM_REGS); |
| 1603 | memset (UNWIND_CONTEXT (fi)->reg, 0, |
| 1604 | sizeof (struct context_reg) * NUM_REGS); |
| 1605 | |
| 1606 | if (fi->next) |
| 1607 | { |
| 1608 | context_cpy (UNWIND_CONTEXT (fi), UNWIND_CONTEXT (fi->next)); |
| 1609 | frame_state_for (UNWIND_CONTEXT (fi), fs); |
| 1610 | update_context (UNWIND_CONTEXT (fi), fs, 1); |
| 1611 | } |
| 1612 | else |
| 1613 | { |
| 1614 | UNWIND_CONTEXT (fi)->ra = fi->pc + 1; |
| 1615 | frame_state_for (UNWIND_CONTEXT (fi), fs); |
| 1616 | update_context (UNWIND_CONTEXT (fi), fs, 0); |
| 1617 | } |
| 1618 | unwind_tmp_obstack_free (); |
| 1619 | } |
| 1620 | |
| 1621 | /* Obtain return address of the frame. */ |
| 1622 | CORE_ADDR |
| 1623 | cfi_get_ra (struct frame_info *fi) |
| 1624 | { |
| 1625 | return UNWIND_CONTEXT (fi)->ra; |
| 1626 | } |
| 1627 | |
| 1628 | /* Find register number REGNUM relative to FRAME and put its |
| 1629 | (raw) contents in *RAW_BUFFER. Set *OPTIMIZED if the variable |
| 1630 | was optimized out (and thus can't be fetched). If the variable |
| 1631 | was fetched from memory, set *ADDRP to where it was fetched from, |
| 1632 | otherwise it was fetched from a register. |
| 1633 | |
| 1634 | The argument RAW_BUFFER must point to aligned memory. */ |
| 1635 | void |
| 1636 | cfi_get_saved_register (char *raw_buffer, |
| 1637 | int *optimized, |
| 1638 | CORE_ADDR * addrp, |
| 1639 | struct frame_info *frame, |
| 1640 | int regnum, enum lval_type *lval) |
| 1641 | { |
| 1642 | if (!target_has_registers) |
| 1643 | error ("No registers."); |
| 1644 | |
| 1645 | /* Normal systems don't optimize out things with register numbers. */ |
| 1646 | if (optimized != NULL) |
| 1647 | *optimized = 0; |
| 1648 | |
| 1649 | if (addrp) /* default assumption: not found in memory */ |
| 1650 | *addrp = 0; |
| 1651 | |
| 1652 | if (!frame->next) |
| 1653 | { |
| 1654 | read_register_gen (regnum, raw_buffer); |
| 1655 | if (lval != NULL) |
| 1656 | *lval = lval_register; |
| 1657 | if (addrp != NULL) |
| 1658 | *addrp = REGISTER_BYTE (regnum); |
| 1659 | } |
| 1660 | else |
| 1661 | { |
| 1662 | frame = frame->next; |
| 1663 | switch (UNWIND_CONTEXT (frame)->reg[regnum].how) |
| 1664 | { |
| 1665 | case REG_CTX_UNSAVED: |
| 1666 | read_register_gen (regnum, raw_buffer); |
| 1667 | if (lval != NULL) |
| 1668 | *lval = not_lval; |
| 1669 | if (optimized != NULL) |
| 1670 | *optimized = 1; |
| 1671 | break; |
| 1672 | case REG_CTX_SAVED_OFFSET: |
| 1673 | target_read_memory (UNWIND_CONTEXT (frame)->cfa + |
| 1674 | UNWIND_CONTEXT (frame)->reg[regnum].loc.offset, |
| 1675 | raw_buffer, REGISTER_RAW_SIZE (regnum)); |
| 1676 | if (lval != NULL) |
| 1677 | *lval = lval_memory; |
| 1678 | if (addrp != NULL) |
| 1679 | *addrp = |
| 1680 | UNWIND_CONTEXT (frame)->cfa + |
| 1681 | UNWIND_CONTEXT (frame)->reg[regnum].loc.offset; |
| 1682 | break; |
| 1683 | case REG_CTX_SAVED_REG: |
| 1684 | read_register_gen (UNWIND_CONTEXT (frame)->reg[regnum].loc.reg, |
| 1685 | raw_buffer); |
| 1686 | if (lval != NULL) |
| 1687 | *lval = lval_register; |
| 1688 | if (addrp != NULL) |
| 1689 | *addrp = |
| 1690 | REGISTER_BYTE (UNWIND_CONTEXT (frame)->reg[regnum].loc.reg); |
| 1691 | break; |
| 1692 | case REG_CTX_SAVED_ADDR: |
| 1693 | target_read_memory (UNWIND_CONTEXT (frame)->reg[regnum].loc.addr, |
| 1694 | raw_buffer, REGISTER_RAW_SIZE (regnum)); |
| 1695 | if (lval != NULL) |
| 1696 | *lval = lval_memory; |
| 1697 | if (addrp != NULL) |
| 1698 | *addrp = UNWIND_CONTEXT (frame)->reg[regnum].loc.addr; |
| 1699 | break; |
| 1700 | case REG_CTX_VALUE: |
| 1701 | memcpy (raw_buffer, &UNWIND_CONTEXT (frame)->reg[regnum].loc.addr, |
| 1702 | REGISTER_RAW_SIZE (regnum)); |
| 1703 | if (lval != NULL) |
| 1704 | *lval = not_lval; |
| 1705 | if (optimized != NULL) |
| 1706 | *optimized = 0; |
| 1707 | break; |
| 1708 | default: |
| 1709 | internal_error (__FILE__, __LINE__, |
| 1710 | "cfi_get_saved_register: unknown register rule"); |
| 1711 | } |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | /* Return the register that the function uses for a frame pointer, |
| 1716 | plus any necessary offset to be applied to the register before |
| 1717 | any frame pointer offsets. */ |
| 1718 | void |
| 1719 | cfi_virtual_frame_pointer (CORE_ADDR pc, int *frame_reg, |
| 1720 | LONGEST * frame_offset) |
| 1721 | { |
| 1722 | struct context *context; |
| 1723 | struct frame_state *fs; |
| 1724 | |
| 1725 | context = context_alloc (); |
| 1726 | fs = frame_state_alloc (); |
| 1727 | |
| 1728 | context->ra = read_pc () + 1; |
| 1729 | |
| 1730 | frame_state_for (context, fs); |
| 1731 | |
| 1732 | if (fs->cfa_how == CFA_REG_OFFSET) |
| 1733 | { |
| 1734 | *frame_reg = fs->cfa_reg; |
| 1735 | *frame_offset = fs->cfa_offset; |
| 1736 | } |
| 1737 | else |
| 1738 | error ("dwarf cfi error: CFA is not defined as CFA_REG_OFFSET"); |
| 1739 | |
| 1740 | unwind_tmp_obstack_free (); |
| 1741 | } |