1 2 /*--------------------------------------------------------------------*/ 3 /*--- Reading of syms & debug info from ELF .so/executable files. ---*/ 4 /*--- readelf.c ---*/ 5 /*--------------------------------------------------------------------*/ 6 7 /* 8 This file is part of Valgrind, a dynamic binary instrumentation 9 framework. 10 11 Copyright (C) 2000-2010 Julian Seward 12 jseward (at) acm.org 13 14 This program is free software; you can redistribute it and/or 15 modify it under the terms of the GNU General Public License as 16 published by the Free Software Foundation; either version 2 of the 17 License, or (at your option) any later version. 18 19 This program is distributed in the hope that it will be useful, but 20 WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22 General Public License for more details. 23 24 You should have received a copy of the GNU General Public License 25 along with this program; if not, write to the Free Software 26 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 27 02111-1307, USA. 28 29 The GNU General Public License is contained in the file COPYING. 30 */ 31 32 #if defined(VGO_linux) 33 34 #include "pub_core_basics.h" 35 #include "pub_core_vki.h" 36 #include "pub_core_debuginfo.h" 37 #include "pub_core_libcbase.h" 38 #include "pub_core_libcprint.h" 39 #include "pub_core_libcassert.h" 40 #include "pub_core_libcfile.h" 41 #include "pub_core_aspacemgr.h" /* for mmaping debuginfo files */ 42 #include "pub_core_machine.h" /* VG_ELF_CLASS */ 43 #include "pub_core_options.h" 44 #include "pub_core_oset.h" 45 #include "pub_core_tooliface.h" /* VG_(needs) */ 46 #include "pub_core_xarray.h" 47 #include "priv_misc.h" /* dinfo_zalloc/free/strdup */ 48 #include "priv_d3basics.h" 49 #include "priv_tytypes.h" 50 #include "priv_storage.h" 51 #include "priv_readelf.h" /* self */ 52 #include "priv_readdwarf.h" /* 'cos ELF contains DWARF */ 53 #include "priv_readdwarf3.h" 54 #include "priv_readstabs.h" /* and stabs, if we're unlucky */ 55 56 /* --- !!! --- EXTERNAL HEADERS start --- !!! --- */ 57 #include <elf.h> 58 /* --- !!! --- EXTERNAL HEADERS end --- !!! --- */ 59 60 /*------------------------------------------------------------*/ 61 /*--- 32/64-bit parameterisation ---*/ 62 /*------------------------------------------------------------*/ 63 64 /* For all the ELF macros and types which specify '32' or '64', 65 select the correct variant for this platform and give it 66 an 'XX' name. Then use the 'XX' variant consistently in 67 the rest of this file. 68 */ 69 #if VG_WORDSIZE == 4 70 # define ElfXX_Ehdr Elf32_Ehdr 71 # define ElfXX_Shdr Elf32_Shdr 72 # define ElfXX_Phdr Elf32_Phdr 73 # define ElfXX_Nhdr Elf32_Nhdr 74 # define ElfXX_Sym Elf32_Sym 75 # define ElfXX_Off Elf32_Off 76 # define ElfXX_Word Elf32_Word 77 # define ElfXX_Addr Elf32_Addr 78 # define ElfXX_Dyn Elf32_Dyn 79 # define ELFXX_ST_BIND ELF32_ST_BIND 80 # define ELFXX_ST_TYPE ELF32_ST_TYPE 81 82 #elif VG_WORDSIZE == 8 83 # define ElfXX_Ehdr Elf64_Ehdr 84 # define ElfXX_Shdr Elf64_Shdr 85 # define ElfXX_Phdr Elf64_Phdr 86 # define ElfXX_Nhdr Elf64_Nhdr 87 # define ElfXX_Sym Elf64_Sym 88 # define ElfXX_Off Elf64_Off 89 # define ElfXX_Word Elf64_Word 90 # define ElfXX_Addr Elf64_Addr 91 # define ElfXX_Dyn Elf64_Dyn 92 # define ELFXX_ST_BIND ELF64_ST_BIND 93 # define ELFXX_ST_TYPE ELF64_ST_TYPE 94 95 #else 96 # error "VG_WORDSIZE should be 4 or 8" 97 #endif 98 99 100 /*------------------------------------------------------------*/ 101 /*--- ---*/ 102 /*--- Read symbol table and line info from ELF files. ---*/ 103 /*--- ---*/ 104 /*------------------------------------------------------------*/ 105 106 /* readelf.c parses ELF files and acquires symbol table info from 107 them. It calls onwards to readdwarf.c to read DWARF2/3 line number 108 and call frame info found. */ 109 110 111 /* Identify an ELF object file by peering at the first few bytes of 112 it. */ 113 114 Bool ML_(is_elf_object_file)( void* image, SizeT n_image ) 115 { 116 ElfXX_Ehdr* ehdr = (ElfXX_Ehdr*)image; 117 Int ok = 1; 118 119 if (n_image < sizeof(ElfXX_Ehdr)) 120 return False; 121 122 ok &= (ehdr->e_ident[EI_MAG0] == 0x7F 123 && ehdr->e_ident[EI_MAG1] == 'E' 124 && ehdr->e_ident[EI_MAG2] == 'L' 125 && ehdr->e_ident[EI_MAG3] == 'F'); 126 ok &= (ehdr->e_ident[EI_CLASS] == VG_ELF_CLASS 127 && ehdr->e_ident[EI_DATA] == VG_ELF_DATA2XXX 128 && ehdr->e_ident[EI_VERSION] == EV_CURRENT); 129 ok &= (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN); 130 ok &= (ehdr->e_machine == VG_ELF_MACHINE); 131 ok &= (ehdr->e_version == EV_CURRENT); 132 ok &= (ehdr->e_shstrndx != SHN_UNDEF); 133 ok &= (ehdr->e_shoff != 0 && ehdr->e_shnum != 0); 134 ok &= (ehdr->e_phoff != 0 && ehdr->e_phnum != 0); 135 136 if (ok) 137 return True; 138 else 139 return False; 140 } 141 142 143 /* Show a raw ELF symbol, given its in-image address and name. */ 144 145 static 146 void show_raw_elf_symbol ( Int i, 147 ElfXX_Sym* sym, Char* sym_name, Addr sym_svma, 148 Bool ppc64_linux_format ) 149 { 150 HChar* space = ppc64_linux_format ? " " : ""; 151 VG_(printf)("raw symbol [%4d]: ", i); 152 switch (ELFXX_ST_BIND(sym->st_info)) { 153 case STB_LOCAL: VG_(printf)("LOC "); break; 154 case STB_GLOBAL: VG_(printf)("GLO "); break; 155 case STB_WEAK: VG_(printf)("WEA "); break; 156 case STB_LOPROC: VG_(printf)("lop "); break; 157 case STB_HIPROC: VG_(printf)("hip "); break; 158 default: VG_(printf)("??? "); break; 159 } 160 switch (ELFXX_ST_TYPE(sym->st_info)) { 161 case STT_NOTYPE: VG_(printf)("NOT "); break; 162 case STT_OBJECT: VG_(printf)("OBJ "); break; 163 case STT_FUNC: VG_(printf)("FUN "); break; 164 case STT_SECTION: VG_(printf)("SEC "); break; 165 case STT_FILE: VG_(printf)("FIL "); break; 166 case STT_LOPROC: VG_(printf)("lop "); break; 167 case STT_HIPROC: VG_(printf)("hip "); break; 168 default: VG_(printf)("??? "); break; 169 } 170 VG_(printf)(": svma %#010lx, %ssz %4ld %s\n", 171 sym_svma, space, sym->st_size + 0UL, 172 ( sym->st_name ? sym_name : (Char*)"NONAME" ) ); 173 } 174 175 176 /* Decide whether SYM is something we should collect, and if so, copy 177 relevant info to the _OUT arguments. For {x86,amd64,ppc32}-linux 178 this is straightforward - the name, address, size are copied out 179 unchanged. 180 181 There is a bit of a kludge re data symbols (see KLUDGED BSS CHECK 182 below): we assume that the .bss is mapped immediately after .data, 183 and so accept any data symbol which exists in the range [start of 184 .data, size of .data + size of .bss). I don't know if this is 185 really correct/justifiable, or not. 186 187 For ppc64-linux it's more complex. If the symbol is seen to be in 188 the .opd section, it is taken to be a function descriptor, and so 189 a dereference is attempted, in order to get hold of the real entry 190 point address. Also as part of the dereference, there is an attempt 191 to calculate the TOC pointer (R2 value) associated with the symbol. 192 193 To support the ppc64-linux pre-"dotless" ABI (prior to gcc 4.0.0), 194 if the symbol is seen to be outside the .opd section and its name 195 starts with a dot, an .opd deference is not attempted, and no TOC 196 pointer is calculated, but the the leading dot is removed from the 197 name. 198 199 As a result, on ppc64-linux, the caller of this function may have 200 to piece together the real size, address, name of the symbol from 201 multiple calls to this function. Ugly and confusing. 202 */ 203 static 204 Bool get_elf_symbol_info ( 205 /* INPUTS */ 206 struct _DebugInfo* di, /* containing DebugInfo */ 207 ElfXX_Sym* sym, /* ELF symbol */ 208 Char* sym_name, /* name */ 209 Addr sym_svma, /* address as stated in the object file */ 210 Bool symtab_in_debug, /* symbol table is in the debug file */ 211 UChar* opd_img, /* oimage of .opd sec (ppc64-linux only) */ 212 PtrdiffT opd_bias, /* for biasing AVMAs found in .opd */ 213 /* OUTPUTS */ 214 Char** sym_name_out, /* name we should record */ 215 Addr* sym_avma_out, /* addr we should record */ 216 Int* sym_size_out, /* symbol size */ 217 Addr* sym_tocptr_out, /* ppc64-linux only: R2 value to be 218 used on entry */ 219 Bool* from_opd_out, /* ppc64-linux only: did we deref an 220 .opd entry? */ 221 Bool* is_text_out, /* is this a text symbol? */ 222 Bool* is_ifunc /* is this a STT_GNU_IFUNC function ?*/ 223 ) 224 { 225 Bool plausible; 226 # if defined(VGP_ppc64_linux) 227 Bool is_in_opd; 228 # endif 229 Bool in_text, in_data, in_sdata, in_rodata, in_bss, in_sbss; 230 Addr text_svma, data_svma, sdata_svma, rodata_svma, bss_svma, sbss_svma; 231 PtrdiffT text_bias, data_bias, sdata_bias, rodata_bias, bss_bias, sbss_bias; 232 233 /* Set defaults */ 234 *sym_name_out = sym_name; 235 *sym_avma_out = sym_svma; /* we will bias this shortly */ 236 *is_text_out = True; 237 *sym_size_out = (Int)sym->st_size; 238 *sym_tocptr_out = 0; /* unknown/inapplicable */ 239 *from_opd_out = False; 240 *is_ifunc = False; 241 242 /* Figure out if we're interested in the symbol. Firstly, is it of 243 the right flavour? */ 244 plausible 245 = (ELFXX_ST_BIND(sym->st_info) == STB_GLOBAL 246 || ELFXX_ST_BIND(sym->st_info) == STB_LOCAL 247 || ELFXX_ST_BIND(sym->st_info) == STB_WEAK 248 ) 249 && 250 (ELFXX_ST_TYPE(sym->st_info) == STT_FUNC 251 || ELFXX_ST_TYPE(sym->st_info) == STT_OBJECT 252 #ifdef STT_GNU_IFUNC 253 || ELFXX_ST_TYPE(sym->st_info) == STT_GNU_IFUNC 254 #endif 255 ); 256 257 /* Work out the svma and bias for each section as it will appear in 258 addresses in the symbol table. */ 259 if (symtab_in_debug) { 260 text_svma = di->text_debug_svma; 261 text_bias = di->text_debug_bias; 262 data_svma = di->data_debug_svma; 263 data_bias = di->data_debug_bias; 264 sdata_svma = di->sdata_debug_svma; 265 sdata_bias = di->sdata_debug_bias; 266 rodata_svma = di->rodata_debug_svma; 267 rodata_bias = di->rodata_debug_bias; 268 bss_svma = di->bss_debug_svma; 269 bss_bias = di->bss_debug_bias; 270 sbss_svma = di->sbss_debug_svma; 271 sbss_bias = di->sbss_debug_bias; 272 } else { 273 text_svma = di->text_svma; 274 text_bias = di->text_bias; 275 data_svma = di->data_svma; 276 data_bias = di->data_bias; 277 sdata_svma = di->sdata_svma; 278 sdata_bias = di->sdata_bias; 279 rodata_svma = di->rodata_svma; 280 rodata_bias = di->rodata_bias; 281 bss_svma = di->bss_svma; 282 bss_bias = di->bss_bias; 283 sbss_svma = di->sbss_svma; 284 sbss_bias = di->sbss_bias; 285 } 286 287 /* Now bias sym_avma_out accordingly by figuring out exactly which 288 section the symbol is from and bias accordingly. Screws up if 289 the previously deduced section svma address ranges are wrong. */ 290 if (di->text_present 291 && di->text_size > 0 292 && sym_svma >= text_svma 293 && sym_svma < text_svma + di->text_size) { 294 *is_text_out = True; 295 *sym_avma_out += text_bias; 296 } else 297 if (di->data_present 298 && di->data_size > 0 299 && sym_svma >= data_svma 300 && sym_svma < data_svma + di->data_size) { 301 *is_text_out = False; 302 *sym_avma_out += data_bias; 303 } else 304 if (di->sdata_present 305 && di->sdata_size > 0 306 && sym_svma >= sdata_svma 307 && sym_svma < sdata_svma + di->sdata_size) { 308 *is_text_out = False; 309 *sym_avma_out += sdata_bias; 310 } else 311 if (di->rodata_present 312 && di->rodata_size > 0 313 && sym_svma >= rodata_svma 314 && sym_svma < rodata_svma + di->rodata_size) { 315 *is_text_out = False; 316 *sym_avma_out += rodata_bias; 317 } else 318 if (di->bss_present 319 && di->bss_size > 0 320 && sym_svma >= bss_svma 321 && sym_svma < bss_svma + di->bss_size) { 322 *is_text_out = False; 323 *sym_avma_out += bss_bias; 324 } else 325 if (di->sbss_present 326 && di->sbss_size > 0 327 && sym_svma >= sbss_svma 328 && sym_svma < sbss_svma + di->sbss_size) { 329 *is_text_out = False; 330 *sym_avma_out += sbss_bias; 331 } else { 332 /* Assume it's in .text. Is this a good idea? */ 333 *is_text_out = True; 334 *sym_avma_out += text_bias; 335 } 336 337 # ifdef STT_GNU_IFUNC 338 /* Check for indirect functions. */ 339 if (*is_text_out 340 && ELFXX_ST_TYPE(sym->st_info) == STT_GNU_IFUNC) { 341 *is_ifunc = True; 342 } 343 # endif 344 345 # if defined(VGP_ppc64_linux) 346 /* Allow STT_NOTYPE in the very special case where we're running on 347 ppc64-linux and the symbol is one which the .opd-chasing hack 348 below will chase. */ 349 if (!plausible 350 && *is_text_out 351 && ELFXX_ST_TYPE(sym->st_info) == STT_NOTYPE 352 && sym->st_size > 0 353 && di->opd_present 354 && di->opd_size > 0 355 && *sym_avma_out >= di->opd_avma 356 && *sym_avma_out < di->opd_avma + di->opd_size) 357 plausible = True; 358 # endif 359 360 if (!plausible) 361 return False; 362 363 /* Ignore if nameless, or zero-sized. */ 364 if (sym->st_name == (ElfXX_Word)0 365 || /* VG_(strlen)(sym_name) == 0 */ 366 /* equivalent but cheaper ... */ 367 sym_name[0] == 0 368 || sym->st_size == 0) { 369 TRACE_SYMTAB(" ignore -- size=0: %s\n", sym_name); 370 return False; 371 } 372 373 /* This seems to significantly reduce the number of junk 374 symbols, and particularly reduces the number of 375 overlapping address ranges. Don't ask me why ... */ 376 if ((Int)sym->st_value == 0) { 377 TRACE_SYMTAB( " ignore -- valu=0: %s\n", sym_name); 378 return False; 379 } 380 381 /* If it's apparently in a GOT or PLT, it's really a reference to a 382 symbol defined elsewhere, so ignore it. */ 383 if (di->got_present 384 && di->got_size > 0 385 && *sym_avma_out >= di->got_avma 386 && *sym_avma_out < di->got_avma + di->got_size) { 387 TRACE_SYMTAB(" ignore -- in GOT: %s\n", sym_name); 388 return False; 389 } 390 if (di->plt_present 391 && di->plt_size > 0 392 && *sym_avma_out >= di->plt_avma 393 && *sym_avma_out < di->plt_avma + di->plt_size) { 394 TRACE_SYMTAB(" ignore -- in PLT: %s\n", sym_name); 395 return False; 396 } 397 398 /* ppc64-linux nasty hack: if the symbol is in an .opd section, 399 then really what we have is the address of a function 400 descriptor. So use the first word of that as the function's 401 text. 402 403 See thread starting at 404 http://gcc.gnu.org/ml/gcc-patches/2004-08/msg00557.html 405 */ 406 # if defined(VGP_ppc64_linux) 407 is_in_opd = False; 408 # endif 409 410 if (di->opd_present 411 && di->opd_size > 0 412 && *sym_avma_out >= di->opd_avma 413 && *sym_avma_out < di->opd_avma + di->opd_size) { 414 # if !defined(VGP_ppc64_linux) 415 TRACE_SYMTAB(" ignore -- in OPD: %s\n", sym_name); 416 return False; 417 # else 418 Int offset_in_opd; 419 ULong* fn_descr; 420 Bool details = 1||False; 421 422 if (details) 423 TRACE_SYMTAB("opdXXX: opd_bias %p, sym_svma_out %p\n", 424 (void*)(opd_bias), (void*)*sym_avma_out); 425 426 if (!VG_IS_8_ALIGNED(*sym_avma_out)) { 427 TRACE_SYMTAB(" ignore -- not 8-aligned: %s\n", sym_name); 428 return False; 429 } 430 431 /* *sym_avma_out is a vma pointing into the .opd section. We 432 know the vma of the opd section start, so we can figure out 433 how far into the opd section this is. */ 434 435 offset_in_opd = (Addr)(*sym_avma_out) - (Addr)(di->opd_avma); 436 if (offset_in_opd < 0 || offset_in_opd >= di->opd_size) { 437 TRACE_SYMTAB(" ignore -- invalid OPD offset: %s\n", sym_name); 438 return False; 439 } 440 441 /* Now we want to know what's at that offset in the .opd 442 section. We can't look in the running image since it won't 443 necessarily have been mapped. But we can consult the oimage. 444 opd_img is the start address of the .opd in the oimage. 445 Hence: */ 446 447 fn_descr = (ULong*)(opd_img + offset_in_opd); 448 449 if (details) 450 TRACE_SYMTAB("opdXXY: offset %d, fn_descr %p\n", 451 offset_in_opd, fn_descr); 452 if (details) 453 TRACE_SYMTAB("opdXXZ: *fn_descr %p\n", (void*)(fn_descr[0])); 454 455 /* opd_bias is the what we have to add to SVMAs found in .opd to 456 get plausible .text AVMAs for the entry point, and .data 457 AVMAs (presumably) for the TOC locations. We use the caller 458 supplied value (which is di->text_bias) for both of these. 459 Not sure why that is correct - it seems to work, and sounds 460 OK for fn_descr[0], but surely we need to use the data bias 461 and not the text bias for fn_descr[1] ? Oh Well. 462 */ 463 *sym_avma_out = fn_descr[0] + opd_bias; 464 *sym_tocptr_out = fn_descr[1] + opd_bias; 465 *from_opd_out = True; 466 is_in_opd = True; 467 468 /* Do a final sanity check: if the symbol falls outside the 469 DebugInfo's mapped range, ignore it. Since *sym_avma_out has 470 been updated, that can be achieved simply by falling through 471 to the test below. */ 472 473 # endif /* ppc64-linux nasty hack */ 474 } 475 476 /* Here's yet another ppc64-linux hack. Get rid of leading dot if 477 the symbol is outside .opd. */ 478 # if defined(VGP_ppc64_linux) 479 if (di->opd_size > 0 480 && !is_in_opd 481 && sym_name[0] == '.') { 482 vg_assert(!(*from_opd_out)); 483 *sym_name_out = &sym_name[1]; 484 } 485 # endif 486 487 /* If no part of the symbol falls within the mapped range, 488 ignore it. */ 489 490 in_text 491 = di->text_present 492 && di->text_size > 0 493 && !(*sym_avma_out + *sym_size_out <= di->text_avma 494 || *sym_avma_out >= di->text_avma + di->text_size); 495 496 in_data 497 = di->data_present 498 && di->data_size > 0 499 && !(*sym_avma_out + *sym_size_out <= di->data_avma 500 || *sym_avma_out >= di->data_avma + di->data_size); 501 502 in_sdata 503 = di->sdata_present 504 && di->sdata_size > 0 505 && !(*sym_avma_out + *sym_size_out <= di->sdata_avma 506 || *sym_avma_out >= di->sdata_avma + di->sdata_size); 507 508 in_rodata 509 = di->rodata_present 510 && di->rodata_size > 0 511 && !(*sym_avma_out + *sym_size_out <= di->rodata_avma 512 || *sym_avma_out >= di->rodata_avma + di->rodata_size); 513 514 in_bss 515 = di->bss_present 516 && di->bss_size > 0 517 && !(*sym_avma_out + *sym_size_out <= di->bss_avma 518 || *sym_avma_out >= di->bss_avma + di->bss_size); 519 520 in_sbss 521 = di->sbss_present 522 && di->sbss_size > 0 523 && !(*sym_avma_out + *sym_size_out <= di->sbss_avma 524 || *sym_avma_out >= di->sbss_avma + di->sbss_size); 525 526 527 if (*is_text_out) { 528 /* This used to reject any symbol falling outside the text 529 segment ("if (!in_text) ..."). Now it is relaxed slightly, 530 to reject only symbols which fall outside the area mapped 531 r-x. This is in accordance with r7427. See 532 "Comment_Regarding_Text_Range_Checks" in storage.c for 533 background. */ 534 Bool in_rx; 535 vg_assert(di->have_rx_map); 536 in_rx = (!(*sym_avma_out + *sym_size_out <= di->rx_map_avma 537 || *sym_avma_out >= di->rx_map_avma + di->rx_map_size)); 538 if (in_text) 539 vg_assert(in_rx); 540 if (!in_rx) { 541 TRACE_SYMTAB( 542 "ignore -- %#lx .. %#lx outside .text svma range %#lx .. %#lx\n", 543 *sym_avma_out, *sym_avma_out + *sym_size_out, 544 di->text_avma, 545 di->text_avma + di->text_size); 546 return False; 547 } 548 } else { 549 if (!(in_data || in_sdata || in_rodata || in_bss || in_sbss)) { 550 TRACE_SYMTAB( 551 "ignore -- %#lx .. %#lx outside .data / .sdata / .rodata / .bss / .sbss svma ranges\n", 552 *sym_avma_out, *sym_avma_out + *sym_size_out); 553 return False; 554 } 555 } 556 557 # if defined(VGP_ppc64_linux) 558 /* It's crucial that we never add symbol addresses in the .opd 559 section. This would completely mess up function redirection and 560 intercepting. This assert ensures that anysymbols that make it 561 into the symbol table on ppc64-linux don't point into .opd. */ 562 if (di->opd_present && di->opd_size > 0) { 563 vg_assert(*sym_avma_out + *sym_size_out <= di->opd_avma 564 || *sym_avma_out >= di->opd_avma + di->opd_size); 565 } 566 # endif 567 568 /* Acquire! */ 569 return True; 570 } 571 572 573 /* Read an ELF symbol table (normal or dynamic). This one is for the 574 "normal" case ({x86,amd64,ppc32}-linux). */ 575 static 576 __attribute__((unused)) /* not referred to on all targets */ 577 void read_elf_symtab__normal( 578 struct _DebugInfo* di, UChar* tab_name, 579 ElfXX_Sym* symtab_img, SizeT symtab_szB, 580 UChar* strtab_img, SizeT strtab_szB, 581 Bool symtab_in_debug, 582 UChar* opd_img /* ppc64-linux only */ 583 ) 584 { 585 Word i; 586 Addr sym_svma, sym_avma_really; 587 Char *sym_name, *sym_name_really; 588 Int sym_size; 589 Addr sym_tocptr; 590 Bool from_opd, is_text, is_ifunc; 591 DiSym risym; 592 ElfXX_Sym *sym; 593 594 if (strtab_img == NULL || symtab_img == NULL) { 595 Char buf[80]; 596 vg_assert(VG_(strlen)(tab_name) < 40); 597 VG_(sprintf)(buf, " object doesn't have a %s", tab_name); 598 ML_(symerr)(di, False, buf); 599 return; 600 } 601 602 TRACE_SYMTAB("\n--- Reading (ELF, standard) %s (%ld entries) ---\n", 603 tab_name, symtab_szB/sizeof(ElfXX_Sym) ); 604 605 /* Perhaps should start at i = 1; ELF docs suggest that entry 606 0 always denotes 'unknown symbol'. */ 607 for (i = 1; i < (Word)(symtab_szB/sizeof(ElfXX_Sym)); i++) { 608 sym = & symtab_img[i]; 609 sym_name = (UChar*)(strtab_img + sym->st_name); 610 sym_svma = sym->st_value; 611 612 if (di->trace_symtab) 613 show_raw_elf_symbol(i, sym, sym_name, sym_svma, False); 614 615 if (get_elf_symbol_info(di, sym, sym_name, sym_svma, 616 symtab_in_debug, 617 opd_img, di->text_bias, 618 &sym_name_really, 619 &sym_avma_really, 620 &sym_size, 621 &sym_tocptr, 622 &from_opd, &is_text, &is_ifunc)) { 623 624 risym.addr = sym_avma_really; 625 risym.size = sym_size; 626 risym.name = ML_(addStr) ( di, sym_name_really, -1 ); 627 risym.tocptr = sym_tocptr; 628 risym.isText = is_text; 629 risym.isIFunc = is_ifunc; 630 vg_assert(risym.name != NULL); 631 vg_assert(risym.tocptr == 0); /* has no role except on ppc64-linux */ 632 ML_(addSym) ( di, &risym ); 633 634 if (di->trace_symtab) { 635 VG_(printf)(" rec(%c) [%4ld]: " 636 " val %#010lx, sz %4d %s\n", 637 is_text ? 't' : 'd', 638 i, 639 risym.addr, 640 (Int)risym.size, 641 (HChar*)risym.name 642 ); 643 } 644 645 } 646 } 647 } 648 649 650 /* Read an ELF symbol table (normal or dynamic). This one is for 651 ppc64-linux, which requires special treatment. */ 652 653 typedef 654 struct { 655 Addr addr; 656 UChar* name; 657 } 658 TempSymKey; 659 660 typedef 661 struct { 662 TempSymKey key; 663 Addr tocptr; 664 Int size; 665 Bool from_opd; 666 Bool is_text; 667 Bool is_ifunc; 668 } 669 TempSym; 670 671 static Word cmp_TempSymKey ( TempSymKey* key1, TempSym* elem2 ) { 672 if (key1->addr < elem2->key.addr) return -1; 673 if (key1->addr > elem2->key.addr) return 1; 674 return (Word)VG_(strcmp)(key1->name, elem2->key.name); 675 } 676 677 static 678 __attribute__((unused)) /* not referred to on all targets */ 679 void read_elf_symtab__ppc64_linux( 680 struct _DebugInfo* di, UChar* tab_name, 681 ElfXX_Sym* symtab_img, SizeT symtab_szB, 682 UChar* strtab_img, SizeT strtab_szB, 683 Bool symtab_in_debug, 684 UChar* opd_img /* ppc64-linux only */ 685 ) 686 { 687 Word i; 688 Int old_size; 689 Addr sym_svma, sym_avma_really; 690 Char *sym_name, *sym_name_really; 691 Int sym_size; 692 Addr sym_tocptr; 693 Bool from_opd, modify_size, modify_tocptr, is_text, is_ifunc; 694 DiSym risym; 695 ElfXX_Sym *sym; 696 OSet *oset; 697 TempSymKey key; 698 TempSym *elem; 699 TempSym *prev; 700 701 if (strtab_img == NULL || symtab_img == NULL) { 702 Char buf[80]; 703 vg_assert(VG_(strlen)(tab_name) < 40); 704 VG_(sprintf)(buf, " object doesn't have a %s", tab_name); 705 ML_(symerr)(di, False, buf); 706 return; 707 } 708 709 TRACE_SYMTAB("\n--- Reading (ELF, ppc64-linux) %s (%ld entries) ---\n", 710 tab_name, symtab_szB/sizeof(ElfXX_Sym) ); 711 712 oset = VG_(OSetGen_Create)( offsetof(TempSym,key), 713 (OSetCmp_t)cmp_TempSymKey, 714 ML_(dinfo_zalloc), "di.respl.1", 715 ML_(dinfo_free) ); 716 vg_assert(oset); 717 718 /* Perhaps should start at i = 1; ELF docs suggest that entry 719 0 always denotes 'unknown symbol'. */ 720 for (i = 1; i < (Word)(symtab_szB/sizeof(ElfXX_Sym)); i++) { 721 sym = & symtab_img[i]; 722 sym_name = (Char*)(strtab_img + sym->st_name); 723 sym_svma = sym->st_value; 724 725 if (di->trace_symtab) 726 show_raw_elf_symbol(i, sym, sym_name, sym_svma, True); 727 728 if (get_elf_symbol_info(di, sym, sym_name, sym_svma, 729 symtab_in_debug, 730 opd_img, di->text_bias, 731 &sym_name_really, 732 &sym_avma_really, 733 &sym_size, 734 &sym_tocptr, 735 &from_opd, &is_text, &is_ifunc)) { 736 737 /* Check if we've seen this (name,addr) key before. */ 738 key.addr = sym_avma_really; 739 key.name = sym_name_really; 740 prev = VG_(OSetGen_Lookup)( oset, &key ); 741 742 if (prev) { 743 744 /* Seen it before. Fold in whatever new info we can. */ 745 modify_size = False; 746 modify_tocptr = False; 747 old_size = 0; 748 749 if (prev->from_opd && !from_opd 750 && (prev->size == 24 || prev->size == 16) 751 && sym_size != prev->size) { 752 /* Existing one is an opd-redirect, with a bogus size, 753 so the only useful new fact we have is the real size 754 of the symbol. */ 755 modify_size = True; 756 old_size = prev->size; 757 prev->size = sym_size; 758 } 759 else 760 if (!prev->from_opd && from_opd 761 && (sym_size == 24 || sym_size == 16)) { 762 /* Existing one is non-opd, new one is opd. What we 763 can acquire from the new one is the TOC ptr to be 764 used. Since the existing sym is non-toc, it 765 shouldn't currently have an known TOC ptr. */ 766 vg_assert(prev->tocptr == 0); 767 modify_tocptr = True; 768 prev->tocptr = sym_tocptr; 769 } 770 else { 771 /* ignore. can we do better here? */ 772 } 773 774 /* Only one or the other is possible (I think) */ 775 vg_assert(!(modify_size && modify_tocptr)); 776 777 if (modify_size && di->trace_symtab) { 778 VG_(printf)(" modify (old sz %4d) " 779 " val %#010lx, toc %#010lx, sz %4d %s\n", 780 old_size, 781 prev->key.addr, 782 prev->tocptr, 783 (Int) prev->size, 784 (HChar*)prev->key.name 785 ); 786 } 787 if (modify_tocptr && di->trace_symtab) { 788 VG_(printf)(" modify (upd tocptr) " 789 " val %#010lx, toc %#010lx, sz %4d %s\n", 790 prev->key.addr, 791 prev->tocptr, 792 (Int) prev->size, 793 (HChar*)prev->key.name 794 ); 795 } 796 797 } else { 798 799 /* A new (name,addr) key. Add and continue. */ 800 elem = VG_(OSetGen_AllocNode)(oset, sizeof(TempSym)); 801 vg_assert(elem); 802 elem->key = key; 803 elem->tocptr = sym_tocptr; 804 elem->size = sym_size; 805 elem->from_opd = from_opd; 806 elem->is_text = is_text; 807 elem->is_ifunc = is_ifunc; 808 VG_(OSetGen_Insert)(oset, elem); 809 if (di->trace_symtab) { 810 VG_(printf)(" to-oset [%4ld]: " 811 " val %#010lx, toc %#010lx, sz %4d %s\n", 812 i, 813 elem->key.addr, 814 elem->tocptr, 815 (Int) elem->size, 816 (HChar*)elem->key.name 817 ); 818 } 819 820 } 821 } 822 } 823 824 /* All the syms that matter are in the oset. Now pull them out, 825 build a "standard" symbol table, and nuke the oset. */ 826 827 i = 0; 828 VG_(OSetGen_ResetIter)( oset ); 829 830 while ( (elem = VG_(OSetGen_Next)(oset)) ) { 831 risym.addr = elem->key.addr; 832 risym.size = elem->size; 833 risym.name = ML_(addStr) ( di, elem->key.name, -1 ); 834 risym.tocptr = elem->tocptr; 835 risym.isText = elem->is_text; 836 risym.isIFunc = elem->is_ifunc; 837 vg_assert(risym.name != NULL); 838 839 ML_(addSym) ( di, &risym ); 840 if (di->trace_symtab) { 841 VG_(printf)(" rec(%c) [%4ld]: " 842 " val %#010lx, toc %#010lx, sz %4d %s\n", 843 risym.isText ? 't' : 'd', 844 i, 845 risym.addr, 846 risym.tocptr, 847 (Int) risym.size, 848 (HChar*)risym.name 849 ); 850 } 851 i++; 852 } 853 854 VG_(OSetGen_Destroy)( oset ); 855 } 856 857 858 /* 859 * Look for a build-id in an ELF image. The build-id specification 860 * can be found here: 861 * 862 * http://fedoraproject.org/wiki/RolandMcGrath/BuildID 863 */ 864 static 865 Char *find_buildid(Addr image, UWord n_image) 866 { 867 Char* buildid = NULL; 868 ElfXX_Ehdr* ehdr = (ElfXX_Ehdr*)image; 869 870 #ifdef NT_GNU_BUILD_ID 871 if (n_image >= sizeof(ElfXX_Ehdr) && 872 ML_(is_elf_object_file)(ehdr, n_image)) { 873 Word i; 874 875 for (i = 0; i < ehdr->e_phnum; i++) { 876 ElfXX_Phdr* phdr = (ElfXX_Phdr*)(image + ehdr->e_phoff + i * ehdr->e_phentsize); 877 878 if (phdr->p_type == PT_NOTE) { 879 ElfXX_Off offset = phdr->p_offset; 880 881 while (offset < phdr->p_offset + phdr->p_filesz) { 882 ElfXX_Nhdr* note = (ElfXX_Nhdr*)(image + offset); 883 Char* name = (Char *)note + sizeof(ElfXX_Nhdr); 884 UChar *desc = (UChar *)name + ((note->n_namesz + 3) & ~3); 885 Word j; 886 887 if (VG_(strcmp)(name, ELF_NOTE_GNU) == 0 && 888 note->n_type == NT_GNU_BUILD_ID) { 889 buildid = ML_(dinfo_zalloc)("di.fbi.1", note->n_descsz * 2 + 1); 890 891 for (j = 0; j < note->n_descsz; j++) { 892 VG_(sprintf)(buildid + VG_(strlen)(buildid), "%02x", desc[j]); 893 } 894 } 895 896 offset = offset + sizeof(ElfXX_Nhdr) 897 + ((note->n_namesz + 3) & ~3) 898 + ((note->n_descsz + 3) & ~3); 899 } 900 } 901 } 902 } 903 #endif 904 905 return buildid; 906 } 907 908 /* 909 * This routine for calculating the CRC for a separate debug file 910 * is GPLed code borrowed from GNU binutils. 911 */ 912 static UInt 913 calc_gnu_debuglink_crc32(UInt crc, const UChar *buf, Int len) 914 { 915 static const UInt crc32_table[256] = 916 { 917 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 918 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 919 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 920 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 921 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 922 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 923 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 924 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 925 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 926 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 927 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 928 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 929 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 930 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 931 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 932 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 933 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 934 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 935 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 936 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 937 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 938 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 939 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 940 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 941 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 942 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 943 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 944 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 945 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 946 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 947 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 948 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 949 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 950 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 951 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 952 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 953 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 954 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 955 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 956 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 957 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 958 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 959 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 960 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 961 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 962 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 963 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 964 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 965 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 966 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 967 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 968 0x2d02ef8d 969 }; 970 const UChar *end; 971 972 crc = ~crc & 0xffffffff; 973 for (end = buf + len; buf < end; ++ buf) 974 crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); 975 return ~crc & 0xffffffff;; 976 } 977 978 /* 979 * Try and open a separate debug file, ignoring any where the CRC does 980 * not match the value from the main object file. 981 */ 982 static 983 Addr open_debug_file( Char* name, Char* buildid, UInt crc, /*OUT*/UWord* size ) 984 { 985 SysRes fd, sres; 986 struct vg_stat stat_buf; 987 UInt calccrc; 988 989 fd = VG_(open)(name, VKI_O_RDONLY, 0); 990 if (sr_isError(fd)) 991 return 0; 992 993 if (VG_(fstat)(sr_Res(fd), &stat_buf) != 0) { 994 VG_(close)(sr_Res(fd)); 995 return 0; 996 } 997 998 if (VG_(clo_verbosity) > 1) 999 VG_(message)(Vg_DebugMsg, " Considering %s ..\n", name); 1000 1001 *size = stat_buf.size; 1002 1003 sres = VG_(am_mmap_file_float_valgrind) 1004 ( *size, VKI_PROT_READ, sr_Res(fd), 0 ); 1005 1006 VG_(close)(sr_Res(fd)); 1007 1008 if (sr_isError(sres)) 1009 return 0; 1010 1011 if (buildid) { 1012 Char* debug_buildid = find_buildid(sr_Res(sres), *size); 1013 if (debug_buildid == NULL || VG_(strcmp)(buildid, debug_buildid) != 0) { 1014 SysRes res = VG_(am_munmap_valgrind)(sr_Res(sres), *size); 1015 vg_assert(!sr_isError(res)); 1016 if (VG_(clo_verbosity) > 1) 1017 VG_(message)(Vg_DebugMsg, 1018 " .. build-id mismatch (found %s wanted %s)\n", debug_buildid, buildid); 1019 ML_(dinfo_free)(debug_buildid); 1020 return 0; 1021 } 1022 ML_(dinfo_free)(debug_buildid); 1023 1024 if (VG_(clo_verbosity) > 1) 1025 VG_(message)(Vg_DebugMsg, " .. build-id is valid\n"); 1026 } else { 1027 calccrc = calc_gnu_debuglink_crc32(0, (UChar*)sr_Res(sres), *size); 1028 if (calccrc != crc) { 1029 SysRes res = VG_(am_munmap_valgrind)(sr_Res(sres), *size); 1030 vg_assert(!sr_isError(res)); 1031 if (VG_(clo_verbosity) > 1) 1032 VG_(message)(Vg_DebugMsg, 1033 " .. CRC mismatch (computed %08x wanted %08x)\n", calccrc, crc); 1034 return 0; 1035 } 1036 1037 if (VG_(clo_verbosity) > 1) 1038 VG_(message)(Vg_DebugMsg, " .. CRC is valid\n"); 1039 } 1040 1041 return sr_Res(sres); 1042 } 1043 1044 /* 1045 * Try to find a separate debug file for a given object file. 1046 */ 1047 static 1048 Addr find_debug_file( struct _DebugInfo* di, 1049 Char* objpath, Char* buildid, 1050 Char* debugname, UInt crc, 1051 /*OUT*/UWord* size ) 1052 { 1053 Char *debugpath = NULL; 1054 Addr addr = 0; 1055 1056 if (buildid != NULL) { 1057 debugpath = ML_(dinfo_zalloc)( 1058 "di.fdf.1", 1059 VG_(strlen)(buildid) + 33); 1060 1061 VG_(sprintf)(debugpath, "/usr/lib/debug/.build-id/%c%c/%s.debug", 1062 buildid[0], buildid[1], buildid + 2); 1063 1064 if ((addr = open_debug_file(debugpath, buildid, 0, size)) == 0) { 1065 ML_(dinfo_free)(debugpath); 1066 debugpath = NULL; 1067 } 1068 } 1069 1070 if (addr == 0 && debugname != NULL) { 1071 Char *objdir = ML_(dinfo_strdup)("di.fdf.2", objpath); 1072 Char *objdirptr; 1073 1074 if ((objdirptr = VG_(strrchr)(objdir, '/')) != NULL) 1075 *objdirptr = '\0'; 1076 1077 debugpath = ML_(dinfo_zalloc)( 1078 "di.fdf.3", 1079 VG_(strlen)(objdir) + VG_(strlen)(debugname) + 32); 1080 1081 VG_(sprintf)(debugpath, "%s/%s", objdir, debugname); 1082 1083 if ((addr = open_debug_file(debugpath, NULL, crc, size)) == 0) { 1084 VG_(sprintf)(debugpath, "%s/.debug/%s", objdir, debugname); 1085 if ((addr = open_debug_file(debugpath, NULL, crc, size)) == 0) { 1086 VG_(sprintf)(debugpath, "/usr/lib/debug%s/%s", objdir, debugname); 1087 if ((addr = open_debug_file(debugpath, NULL, crc, size)) == 0) { 1088 #ifdef ANDROID 1089 VG_(sprintf)(debugpath, "/data/local/symbols%s/%s", objdir, debugname); 1090 addr = open_debug_file(debugpath, NULL, crc, size); 1091 #endif 1092 } 1093 } 1094 } 1095 1096 ML_(dinfo_free)(objdir); 1097 } 1098 1099 if (addr) { 1100 TRACE_SYMTAB("\n"); 1101 TRACE_SYMTAB("------ Found a debuginfo file: %s\n", debugpath); 1102 } 1103 1104 ML_(dinfo_free)(debugpath); 1105 1106 return addr; 1107 } 1108 1109 1110 static Bool contained_within ( Addr outer, UWord n_outer, 1111 Addr inner, UWord n_inner ) 1112 { 1113 if (n_outer == 0 || n_inner == 0) 1114 return False; 1115 /* Simplistic .. assumes no wraparound (reasonably enough) */ 1116 if (inner >= outer && inner+n_inner <= outer+n_outer) 1117 return True; 1118 return False; 1119 } 1120 1121 static void* INDEX_BIS ( void* base, Word idx, Word scale ) { 1122 return (void*)( ((UChar*)base) + idx * scale ); 1123 } 1124 1125 1126 /* Find the file offset corresponding to SVMA by using the program 1127 headers. This is taken from binutils-2.17/binutils/readelf.c 1128 offset_from_vma(). */ 1129 static 1130 Word file_offset_from_svma ( /*OUT*/Bool* ok, 1131 Addr svma, 1132 ElfXX_Phdr* phdr_img, 1133 Word phdr_nent, 1134 Word phdr_ent_szB ) 1135 { 1136 Word i; 1137 ElfXX_Phdr* seg; 1138 for (i = 0; i < phdr_nent; i++) { 1139 seg = INDEX_BIS( phdr_img, i, phdr_ent_szB ); 1140 if (seg->p_type != PT_LOAD) 1141 continue; 1142 if (svma >= (seg->p_vaddr & -seg->p_align) 1143 && svma + 1 <= seg->p_vaddr + seg->p_filesz) { 1144 *ok = True; 1145 return svma - seg->p_vaddr + seg->p_offset; 1146 } 1147 } 1148 *ok = False; 1149 return 0; 1150 } 1151 1152 /* The central function for reading ELF debug info. For the 1153 object/exe specified by the DebugInfo, find ELF sections, then read 1154 the symbols, line number info, file name info, CFA (stack-unwind 1155 info) and anything else we want, into the tables within the 1156 supplied DebugInfo. 1157 */ 1158 Bool ML_(read_elf_debug_info) ( struct _DebugInfo* di ) 1159 { 1160 Bool res, ok; 1161 SysRes fd, sres; 1162 Word i; 1163 Bool dynbss_present = False; 1164 Bool sdynbss_present = False; 1165 1166 /* Image addresses for the ELF file we're working with. */ 1167 Addr oimage = 0; 1168 UWord n_oimage = 0; 1169 1170 /* Ditto for any ELF debuginfo file that we might happen to load. */ 1171 Addr dimage = 0; 1172 UWord n_dimage = 0; 1173 1174 /* ELF header for the main file. Should == oimage since is at 1175 start of file. */ 1176 ElfXX_Ehdr* ehdr_img = NULL; 1177 1178 /* Program header table image addr, # entries, entry size */ 1179 ElfXX_Phdr* phdr_img = NULL; 1180 UWord phdr_nent = 0; 1181 UWord phdr_ent_szB = 0; 1182 1183 /* Section header image addr, # entries, entry size. Also the 1184 associated string table. */ 1185 ElfXX_Shdr* shdr_img = NULL; 1186 UWord shdr_nent = 0; 1187 UWord shdr_ent_szB = 0; 1188 UChar* shdr_strtab_img = NULL; 1189 1190 /* SVMAs covered by rx and rw segments and corresponding bias. */ 1191 Addr rx_svma_base = 0; 1192 Addr rx_svma_limit = 0; 1193 PtrdiffT rx_bias = 0; 1194 Addr rw_svma_base = 0; 1195 Addr rw_svma_limit = 0; 1196 PtrdiffT rw_bias = 0; 1197 1198 /* Build ID */ 1199 Char* buildid = NULL; 1200 1201 vg_assert(di); 1202 vg_assert(di->have_rx_map == True); 1203 vg_assert(di->have_rw_map == True); 1204 vg_assert(di->rx_map_size > 0); 1205 vg_assert(di->rw_map_size > 0); 1206 vg_assert(di->have_dinfo == False); 1207 vg_assert(di->filename); 1208 vg_assert(!di->memname); 1209 vg_assert(!di->symtab); 1210 vg_assert(!di->loctab); 1211 vg_assert(!di->cfsi); 1212 vg_assert(!di->cfsi_exprs); 1213 vg_assert(!di->strchunks); 1214 vg_assert(!di->soname); 1215 1216 /* If these don't hold true, it means that m_syswrap/m_aspacemgr 1217 managed to do a mapping where the start isn't page aligned. 1218 Which sounds pretty bogus to me. */ 1219 vg_assert(VG_IS_PAGE_ALIGNED(di->rx_map_avma)); 1220 vg_assert(VG_IS_PAGE_ALIGNED(di->rw_map_avma)); 1221 1222 /* ---------------------------------------------------------- 1223 At this point, there is very little information in the 1224 DebugInfo. We only know that something that looks like an ELF 1225 file has been mapped rx-ishly as recorded with the di->*rx_map* 1226 fields and has also been mapped rw-ishly as recorded with the 1227 di->*rw_map* fields. First we examine the file's ELF Program 1228 Header, and, by comparing that against the di->*r{w,x}_map* 1229 info, try to figure out the AVMAs for the sections we care 1230 about, that should have been mapped: text, data, sdata, bss got, 1231 plt, and toc. 1232 ---------------------------------------------------------- */ 1233 1234 res = False; 1235 1236 oimage = (Addr)NULL; 1237 if (VG_(clo_verbosity) > 1 || VG_(clo_trace_redir)) 1238 VG_(message)(Vg_DebugMsg, "Reading syms from %s (%#lx)\n", 1239 di->filename, di->rx_map_avma ); 1240 1241 /* mmap the object image aboard, so that we can read symbols and 1242 line number info out of it. It will be munmapped immediately 1243 thereafter; it is only aboard transiently. */ 1244 1245 fd = VG_(open)(di->filename, VKI_O_RDONLY, 0); 1246 if (sr_isError(fd)) { 1247 ML_(symerr)(di, True, "Can't open .so/.exe to read symbols?!"); 1248 return False; 1249 } 1250 1251 { Long n_oimageLL = VG_(fsize)(sr_Res(fd)); 1252 if (n_oimageLL <= 0) { 1253 ML_(symerr)(di, True, "Can't stat .so/.exe (to determine its size)?!"); 1254 VG_(close)(sr_Res(fd)); 1255 return False; 1256 } 1257 n_oimage = (UWord)(ULong)n_oimageLL; 1258 } 1259 1260 sres = VG_(am_mmap_file_float_valgrind) 1261 ( n_oimage, VKI_PROT_READ, sr_Res(fd), 0 ); 1262 1263 VG_(close)(sr_Res(fd)); 1264 1265 if (sr_isError(sres)) { 1266 VG_(message)(Vg_UserMsg, "warning: mmap failed on %s\n", di->filename ); 1267 VG_(message)(Vg_UserMsg, " no symbols or debug info loaded\n" ); 1268 return False; 1269 } 1270 1271 oimage = sr_Res(sres); 1272 /* Check against wraparound. am_mmap_file_float_valgrind should 1273 not produce a wrapped-around mapping. */ 1274 vg_assert(n_oimage > 0); 1275 vg_assert(oimage + n_oimage > oimage); 1276 1277 if (0) { 1278 VG_(printf)("read_elf_debug_info: OIMAGE = %p - %p\n", 1279 (void*)oimage, (void*)(oimage + (UWord)n_oimage)); 1280 } 1281 1282 /* Ok, the object image is safely in oimage[0 .. n_oimage-1]. Now 1283 verify that it is a valid ELF .so or executable image. */ 1284 res = False; 1285 ok = (n_oimage >= sizeof(ElfXX_Ehdr)); 1286 ehdr_img = (ElfXX_Ehdr*)oimage; 1287 1288 if (ok) 1289 ok &= ML_(is_elf_object_file)(ehdr_img, n_oimage); 1290 1291 if (!ok) { 1292 ML_(symerr)(di, True, "Invalid ELF Header"); 1293 goto out; 1294 } 1295 1296 /* Find where the program and section header tables are, and give 1297 up if either is missing or outside the image (bogus). */ 1298 phdr_img = (ElfXX_Phdr*)( ((UChar*)ehdr_img) + ehdr_img->e_phoff ); 1299 phdr_nent = ehdr_img->e_phnum; 1300 phdr_ent_szB = ehdr_img->e_phentsize; 1301 1302 shdr_img = (ElfXX_Shdr*)( ((UChar*)ehdr_img) + ehdr_img->e_shoff ); 1303 shdr_nent = ehdr_img->e_shnum; 1304 shdr_ent_szB = ehdr_img->e_shentsize; 1305 1306 TRACE_SYMTAB("------ Basic facts about the object ------\n"); 1307 TRACE_SYMTAB("object: img %p n_oimage %ld\n", 1308 (void*)oimage, n_oimage); 1309 TRACE_SYMTAB("phdr: img %p nent %ld ent_szB %ld\n", 1310 phdr_img, phdr_nent, phdr_ent_szB); 1311 TRACE_SYMTAB("shdr: img %p nent %ld ent_szB %ld\n", 1312 shdr_img, shdr_nent, shdr_ent_szB); 1313 1314 if (phdr_nent == 0 1315 || !contained_within( 1316 oimage, n_oimage, 1317 (Addr)phdr_img, phdr_nent * phdr_ent_szB)) { 1318 ML_(symerr)(di, True, "Missing or invalid ELF Program Header Table"); 1319 goto out; 1320 } 1321 1322 if (shdr_nent == 0 1323 || !contained_within( 1324 oimage, n_oimage, 1325 (Addr)shdr_img, shdr_nent * shdr_ent_szB)) { 1326 ML_(symerr)(di, True, "Missing or invalid ELF Section Header Table"); 1327 goto out; 1328 } 1329 1330 /* Also find the section header's string table, and validate. */ 1331 /* checked previously by is_elf_object_file: */ 1332 vg_assert( ehdr_img->e_shstrndx != SHN_UNDEF ); 1333 1334 shdr_strtab_img 1335 = (UChar*)( ((UChar*)ehdr_img) 1336 + shdr_img[ehdr_img->e_shstrndx].sh_offset); 1337 if (!contained_within( oimage, n_oimage, 1338 (Addr)shdr_strtab_img, 1339 1/*bogus, but we don't know the real size*/ )) { 1340 ML_(symerr)(di, True, "Invalid ELF Section Header String Table"); 1341 goto out; 1342 } 1343 1344 TRACE_SYMTAB("shdr: string table at %p\n", shdr_strtab_img ); 1345 1346 /* Do another amazingly tedious thing: find out the .soname for 1347 this object. Apparently requires looking through the program 1348 header table. */ 1349 TRACE_SYMTAB("\n"); 1350 TRACE_SYMTAB("------ Looking for the soname ------\n"); 1351 vg_assert(di->soname == NULL); 1352 { 1353 ElfXX_Addr prev_svma = 0; 1354 1355 for (i = 0; i < phdr_nent; i++) { 1356 ElfXX_Phdr* phdr = INDEX_BIS( phdr_img, i, phdr_ent_szB ); 1357 1358 /* Make sure the PT_LOADable entries are in order */ 1359 if (phdr->p_type == PT_LOAD) { 1360 TRACE_SYMTAB("PT_LOAD in order?: %#lx %#lx\n", 1361 prev_svma + 0UL, 1362 phdr->p_vaddr + 0UL); 1363 if (phdr->p_vaddr < prev_svma) { 1364 ML_(symerr)(di, True, 1365 "ELF Program Headers are not in ascending order"); 1366 goto out; 1367 } 1368 prev_svma = phdr->p_vaddr; 1369 if (rx_svma_limit == 0 1370 && phdr->p_offset >= di->rx_map_foff 1371 && phdr->p_offset < di->rx_map_foff + di->rx_map_size 1372 && phdr->p_offset + phdr->p_filesz <= di->rx_map_foff + di->rx_map_size 1373 && (phdr->p_flags&(PF_R|PF_W|PF_X)) == (PF_R|PF_X)) { 1374 rx_svma_base = phdr->p_vaddr; 1375 rx_svma_limit = phdr->p_vaddr + phdr->p_memsz; 1376 rx_bias = di->rx_map_avma - di->rx_map_foff + phdr->p_offset - phdr->p_vaddr; 1377 } 1378 else if (rw_svma_limit == 0 1379 && phdr->p_offset >= di->rw_map_foff 1380 && phdr->p_offset < di->rw_map_foff + di->rw_map_size 1381 && phdr->p_offset + phdr->p_filesz <= di->rw_map_foff + di->rw_map_size 1382 && (phdr->p_flags&(PF_R|PF_W|PF_X)) == (PF_R|PF_W)) { 1383 rw_svma_base = phdr->p_vaddr; 1384 rw_svma_limit = phdr->p_vaddr + phdr->p_memsz; 1385 rw_bias = di->rw_map_avma - di->rw_map_foff + phdr->p_offset - phdr->p_vaddr; 1386 } 1387 } 1388 1389 /* Try to get the soname. If there isn't one, use "NONE". 1390 The seginfo needs to have some kind of soname in order to 1391 facilitate writing redirect functions, since all redirect 1392 specifications require a soname (pattern). */ 1393 if (phdr->p_type == PT_DYNAMIC && di->soname == NULL) { 1394 ElfXX_Dyn* dyn_img = (ElfXX_Dyn*)( ((UChar*)ehdr_img) 1395 + phdr->p_offset); 1396 Word stroff = -1; 1397 UChar* strtab = NULL; 1398 Word j; 1399 for (j = 0; dyn_img[j].d_tag != DT_NULL; j++) { 1400 switch (dyn_img[j].d_tag) { 1401 case DT_SONAME: { 1402 stroff = dyn_img[j].d_un.d_val; 1403 break; 1404 } 1405 case DT_STRTAB: { 1406 Bool ok2 = False; 1407 Word offset = file_offset_from_svma( 1408 &ok2, 1409 dyn_img[j].d_un.d_ptr, 1410 phdr_img, 1411 phdr_nent, phdr_ent_szB 1412 ); 1413 if (ok2 && strtab == NULL) { 1414 vg_assert(offset >= 0 && offset <= n_oimage); 1415 strtab = ((UChar*)ehdr_img) + offset; 1416 } 1417 break; 1418 } 1419 default: 1420 break; 1421 } 1422 } 1423 if (stroff != -1 && strtab != NULL) { 1424 TRACE_SYMTAB("Found soname = %s\n", strtab+stroff); 1425 di->soname = ML_(dinfo_strdup)("di.redi.1", strtab+stroff); 1426 } 1427 } 1428 } /* for (i = 0; i < phdr_nent; i++) ... */ 1429 } /* look for the soname */ 1430 1431 /* If, after looking at all the program headers, we still didn't 1432 find a soname, add a fake one. */ 1433 if (di->soname == NULL) { 1434 TRACE_SYMTAB("No soname found; using (fake) \"NONE\"\n"); 1435 di->soname = "NONE"; 1436 } 1437 1438 vg_assert(rx_svma_limit != 0); 1439 vg_assert(rw_svma_limit != 0); 1440 1441 /* Now read the section table. */ 1442 TRACE_SYMTAB("\n"); 1443 TRACE_SYMTAB("------ Examining the section headers " 1444 "and program headers ------\n"); 1445 TRACE_SYMTAB("rx: at %#lx are mapped foffsets %ld .. %ld\n", 1446 di->rx_map_avma, 1447 di->rx_map_foff, di->rx_map_foff + di->rx_map_size - 1 ); 1448 TRACE_SYMTAB("rx: contains svmas %#lx .. %#lx with bias %#lx\n", 1449 rx_svma_base, rx_svma_limit - 1, rx_bias ); 1450 TRACE_SYMTAB("rw: at %#lx are mapped foffsets %ld .. %ld\n", 1451 di->rw_map_avma, 1452 di->rw_map_foff, di->rw_map_foff + di->rw_map_size - 1 ); 1453 TRACE_SYMTAB("rw: contains svmas %#lx .. %#lx with bias %#lx\n", 1454 rw_svma_base, rw_svma_limit - 1, rw_bias ); 1455 1456 for (i = 0; i < shdr_nent; i++) { 1457 ElfXX_Shdr* shdr = INDEX_BIS( shdr_img, i, shdr_ent_szB ); 1458 UChar* name = shdr_strtab_img + shdr->sh_name; 1459 Addr svma = shdr->sh_addr; 1460 OffT foff = shdr->sh_offset; 1461 UWord size = shdr->sh_size; 1462 UInt alyn = shdr->sh_addralign; 1463 Bool bits = !(shdr->sh_type == SHT_NOBITS); 1464 Bool inrx = svma >= rx_svma_base && svma < rx_svma_limit; 1465 Bool inrw = svma >= rw_svma_base && svma < rw_svma_limit; 1466 1467 TRACE_SYMTAB(" [sec %2ld] %s %s al%2u foff %6ld .. %6ld " 1468 " svma %p name \"%s\"\n", 1469 i, inrx ? "rx" : " ", inrw ? "rw" : " ", alyn, 1470 foff, foff+size-1, (void*)svma, name ); 1471 1472 /* Check for sane-sized segments. SHT_NOBITS sections have zero 1473 size in the file. */ 1474 if ((foff >= n_oimage) || (foff + (bits ? size : 0) > n_oimage)) { 1475 ML_(symerr)(di, True, "ELF Section extends beyond image end"); 1476 goto out; 1477 } 1478 1479 /* Check for a sane alignment value. */ 1480 if (alyn > 0 && -1 == VG_(log2)(alyn)) { 1481 ML_(symerr)(di, True, "ELF Section contains invalid " 1482 ".sh_addralign value"); 1483 goto out; 1484 } 1485 1486 # define BAD(_secname) \ 1487 do { ML_(symerr)(di, True, \ 1488 "Can't make sense of " _secname \ 1489 " section mapping"); \ 1490 goto out; \ 1491 } while (0) 1492 1493 /* Find avma-s for: .text .data .sdata .rodata .bss .sbss .plt .got .opd 1494 and .eh_frame */ 1495 1496 /* Accept .text where mapped as rx (code), even if zero-sized */ 1497 if (0 == VG_(strcmp)(name, ".text")) { 1498 if (inrx && size >= 0 && !di->text_present) { 1499 di->text_present = True; 1500 di->text_svma = svma; 1501 di->text_avma = svma + rx_bias; 1502 di->text_size = size; 1503 di->text_bias = rx_bias; 1504 di->text_debug_svma = svma; 1505 di->text_debug_bias = rx_bias; 1506 TRACE_SYMTAB("acquiring .text svma = %#lx .. %#lx\n", 1507 di->text_svma, 1508 di->text_svma + di->text_size - 1); 1509 TRACE_SYMTAB("acquiring .text avma = %#lx .. %#lx\n", 1510 di->text_avma, 1511 di->text_avma + di->text_size - 1); 1512 TRACE_SYMTAB("acquiring .text bias = %#lx\n", di->text_bias); 1513 } else { 1514 BAD(".text"); 1515 } 1516 } 1517 1518 /* Accept .data where mapped as rw (data), even if zero-sized */ 1519 if (0 == VG_(strcmp)(name, ".data")) { 1520 if (inrw && size >= 0 && !di->data_present) { 1521 di->data_present = True; 1522 di->data_svma = svma; 1523 di->data_avma = svma + rw_bias; 1524 di->data_size = size; 1525 di->data_bias = rw_bias; 1526 di->data_debug_svma = svma; 1527 di->data_debug_bias = rw_bias; 1528 TRACE_SYMTAB("acquiring .data svma = %#lx .. %#lx\n", 1529 di->data_svma, 1530 di->data_svma + di->data_size - 1); 1531 TRACE_SYMTAB("acquiring .data avma = %#lx .. %#lx\n", 1532 di->data_avma, 1533 di->data_avma + di->data_size - 1); 1534 TRACE_SYMTAB("acquiring .data bias = %#lx\n", di->data_bias); 1535 } else { 1536 BAD(".data"); 1537 } 1538 } 1539 1540 /* Accept .sdata where mapped as rw (data) */ 1541 if (0 == VG_(strcmp)(name, ".sdata")) { 1542 if (inrw && size > 0 && !di->sdata_present) { 1543 di->sdata_present = True; 1544 di->sdata_svma = svma; 1545 di->sdata_avma = svma + rw_bias; 1546 di->sdata_size = size; 1547 di->sdata_bias = rw_bias; 1548 di->sdata_debug_svma = svma; 1549 di->sdata_debug_bias = rw_bias; 1550 TRACE_SYMTAB("acquiring .sdata svma = %#lx .. %#lx\n", 1551 di->sdata_svma, 1552 di->sdata_svma + di->sdata_size - 1); 1553 TRACE_SYMTAB("acquiring .sdata avma = %#lx .. %#lx\n", 1554 di->sdata_avma, 1555 di->sdata_avma + di->sdata_size - 1); 1556 TRACE_SYMTAB("acquiring .sdata bias = %#lx\n", di->sdata_bias); 1557 } else { 1558 BAD(".sdata"); 1559 } 1560 } 1561 1562 /* Accept .rodata where mapped as rx (data), even if zero-sized */ 1563 if (0 == VG_(strcmp)(name, ".rodata")) { 1564 if (/*inrx && */size >= 0 && !di->rodata_present) { 1565 di->rodata_present = True; 1566 di->rodata_svma = svma; 1567 di->rodata_avma = svma + rx_bias; 1568 di->rodata_size = size; 1569 di->rodata_bias = rx_bias; 1570 di->rodata_debug_svma = svma; 1571 di->rodata_debug_bias = rw_bias; 1572 TRACE_SYMTAB("acquiring .rodata svma = %#lx .. %#lx\n", 1573 di->rodata_svma, 1574 di->rodata_svma + di->rodata_size - 1); 1575 TRACE_SYMTAB("acquiring .rodata avma = %#lx .. %#lx\n", 1576 di->rodata_avma, 1577 di->rodata_avma + di->rodata_size - 1); 1578 TRACE_SYMTAB("acquiring .rodata bias = %#lx\n", di->rodata_bias); 1579 } else { 1580 BAD(".rodata"); 1581 } 1582 } 1583 1584 if (0 == VG_(strcmp)(name, ".dynbss")) { 1585 if (inrw && size > 0 && !di->bss_present) { 1586 dynbss_present = True; 1587 di->bss_present = True; 1588 di->bss_svma = svma; 1589 di->bss_avma = svma + rw_bias; 1590 di->bss_size = size; 1591 di->bss_bias = rw_bias; 1592 di->bss_debug_svma = svma; 1593 di->bss_debug_bias = rw_bias; 1594 TRACE_SYMTAB("acquiring .dynbss svma = %#lx .. %#lx\n", 1595 di->bss_svma, 1596 di->bss_svma + di->bss_size - 1); 1597 TRACE_SYMTAB("acquiring .dynbss avma = %#lx .. %#lx\n", 1598 di->bss_avma, 1599 di->bss_avma + di->bss_size - 1); 1600 TRACE_SYMTAB("acquiring .dynbss bias = %#lx\n", di->bss_bias); 1601 } 1602 } 1603 1604 /* Accept .bss where mapped as rw (data), even if zero-sized */ 1605 if (0 == VG_(strcmp)(name, ".bss")) { 1606 if (inrw && size > 0 && dynbss_present) { 1607 vg_assert(di->bss_present); 1608 dynbss_present = False; 1609 vg_assert(di->bss_svma + di->bss_size == svma); 1610 di->bss_size += size; 1611 TRACE_SYMTAB("acquiring .bss svma = %#lx .. %#lx\n", 1612 svma, svma + size - 1); 1613 TRACE_SYMTAB("acquiring .bss avma = %#lx .. %#lx\n", 1614 svma + rw_bias, svma + rw_bias + size - 1); 1615 TRACE_SYMTAB("acquiring .bss bias = %#lx\n", di->bss_bias); 1616 } else 1617 1618 if (inrw && size >= 0 && !di->bss_present) { 1619 di->bss_present = True; 1620 di->bss_svma = svma; 1621 di->bss_avma = svma + rw_bias; 1622 di->bss_size = size; 1623 di->bss_bias = rw_bias; 1624 di->bss_debug_svma = svma; 1625 di->bss_debug_bias = rw_bias; 1626 TRACE_SYMTAB("acquiring .bss svma = %#lx .. %#lx\n", 1627 di->bss_svma, 1628 di->bss_svma + di->bss_size - 1); 1629 TRACE_SYMTAB("acquiring .bss avma = %#lx .. %#lx\n", 1630 di->bss_avma, 1631 di->bss_avma + di->bss_size - 1); 1632 TRACE_SYMTAB("acquiring .bss bias = %#lx\n", di->bss_bias); 1633 } else 1634 1635 /* Now one from the wtf?! department ... */ 1636 if (inrx && (!inrw) && size >= 0 && !di->bss_present) { 1637 /* File contains a .bss, but it got mapped as rx only. 1638 This is very strange. For now, just pretend we didn't 1639 see it :-) */ 1640 di->bss_present = False; 1641 di->bss_svma = 0; 1642 di->bss_avma = 0; 1643 di->bss_size = 0; 1644 di->bss_bias = 0; 1645 di->bss_debug_svma = 0; 1646 di->bss_debug_bias = 0; 1647 if (!VG_(clo_xml)) { 1648 VG_(message)(Vg_UserMsg, 1649 "Warning: the following file's .bss is " 1650 "mapped r-x only - ignoring .bss syms\n"); 1651 VG_(message)(Vg_UserMsg, " %s\n", di->filename 1652 ? di->filename 1653 : (UChar*)"(null?!)" ); 1654 } 1655 } else 1656 1657 if ((!inrw) && (!inrx) && size >= 0 && !di->bss_present) { 1658 /* File contains a .bss, but it didn't get mapped. Ignore. */ 1659 di->bss_present = False; 1660 di->bss_svma = 0; 1661 di->bss_avma = 0; 1662 di->bss_size = 0; 1663 di->bss_bias = 0; 1664 } else { 1665 BAD(".bss"); 1666 } 1667 } 1668 1669 if (0 == VG_(strcmp)(name, ".sdynbss")) { 1670 if (inrw && size >= 0 && !di->sbss_present) { 1671 sdynbss_present = True; 1672 di->sbss_present = True; 1673 di->sbss_svma = svma; 1674 di->sbss_avma = svma + rw_bias; 1675 di->sbss_size = size; 1676 di->sbss_bias = rw_bias; 1677 di->sbss_debug_svma = svma; 1678 di->sbss_debug_bias = rw_bias; 1679 TRACE_SYMTAB("acquiring .sdynbss svma = %#lx .. %#lx\n", 1680 di->sbss_svma, 1681 di->sbss_svma + di->sbss_size - 1); 1682 TRACE_SYMTAB("acquiring .sdynbss avma = %#lx .. %#lx\n", 1683 di->sbss_avma, 1684 di->sbss_avma + di->sbss_size - 1); 1685 TRACE_SYMTAB("acquiring .sdynbss bias = %#lx\n", di->sbss_bias); 1686 } 1687 } 1688 1689 /* Accept .sbss where mapped as rw (data) */ 1690 if (0 == VG_(strcmp)(name, ".sbss")) { 1691 if (inrw && size > 0 && sdynbss_present) { 1692 vg_assert(di->sbss_present); 1693 sdynbss_present = False; 1694 vg_assert(di->sbss_svma + di->sbss_size == svma); 1695 di->sbss_size += size; 1696 TRACE_SYMTAB("acquiring .sbss svma = %#lx .. %#lx\n", 1697 svma, svma + size - 1); 1698 TRACE_SYMTAB("acquiring .sbss avma = %#lx .. %#lx\n", 1699 svma + rw_bias, svma + rw_bias + size - 1); 1700 TRACE_SYMTAB("acquiring .sbss bias = %#lx\n", di->sbss_bias); 1701 } else 1702 1703 if (inrw && size > 0 && !di->sbss_present) { 1704 di->sbss_present = True; 1705 di->sbss_svma = svma; 1706 di->sbss_avma = svma + rw_bias; 1707 di->sbss_size = size; 1708 di->sbss_bias = rw_bias; 1709 di->sbss_debug_svma = svma; 1710 di->sbss_debug_bias = rw_bias; 1711 TRACE_SYMTAB("acquiring .sbss svma = %#lx .. %#lx\n", 1712 di->sbss_svma, 1713 di->sbss_svma + di->sbss_size - 1); 1714 TRACE_SYMTAB("acquiring .sbss avma = %#lx .. %#lx\n", 1715 di->sbss_avma, 1716 di->sbss_avma + di->sbss_size - 1); 1717 TRACE_SYMTAB("acquiring .sbss bias = %#lx\n", di->sbss_bias); 1718 } else { 1719 BAD(".sbss"); 1720 } 1721 } 1722 1723 /* Accept .got where mapped as rw (data) */ 1724 if (0 == VG_(strcmp)(name, ".got")) { 1725 if (inrw && size > 0 && !di->got_present) { 1726 di->got_present = True; 1727 di->got_avma = svma + rw_bias; 1728 di->got_size = size; 1729 TRACE_SYMTAB("acquiring .got avma = %#lx\n", di->got_avma); 1730 } else { 1731 BAD(".got"); 1732 } 1733 } 1734 1735 /* Accept .got.plt where mapped as rw (data) */ 1736 if (0 == VG_(strcmp)(name, ".got.plt")) { 1737 if (inrw && size > 0 && !di->gotplt_present) { 1738 di->gotplt_present = True; 1739 di->gotplt_avma = svma + rw_bias; 1740 di->gotplt_size = size; 1741 TRACE_SYMTAB("acquiring .got.plt avma = %#lx\n", di->gotplt_avma); 1742 } else if (size != 0) { 1743 if (!di->gotplt_present) { 1744 VG_(printf)("WARNING: ignoring non-empty .got.plt outside of RW segment!\n"); 1745 VG_(printf)("Filename %s, section size %d\n", di->filename, size); 1746 } else { 1747 BAD(".got.plt"); 1748 } 1749 } 1750 } 1751 1752 /* PLT is different on different platforms, it seems. */ 1753 # if defined(VGP_x86_linux) || defined(VGP_amd64_linux) \ 1754 || defined(VGP_arm_linux) 1755 /* Accept .plt where mapped as rx (code) */ 1756 if (0 == VG_(strcmp)(name, ".plt")) { 1757 if (inrx && size > 0 && !di->plt_present) { 1758 di->plt_present = True; 1759 di->plt_avma = svma + rx_bias; 1760 di->plt_size = size; 1761 TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma); 1762 } else { 1763 BAD(".plt"); 1764 } 1765 } 1766 # elif defined(VGP_ppc32_linux) 1767 /* Accept .plt where mapped as rw (data) */ 1768 if (0 == VG_(strcmp)(name, ".plt")) { 1769 if (inrw && size > 0 && !di->plt_present) { 1770 di->plt_present = True; 1771 di->plt_avma = svma + rw_bias; 1772 di->plt_size = size; 1773 TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma); 1774 } else { 1775 BAD(".plt"); 1776 } 1777 } 1778 # elif defined(VGP_ppc64_linux) 1779 /* Accept .plt where mapped as rw (data), or unmapped */ 1780 if (0 == VG_(strcmp)(name, ".plt")) { 1781 if (inrw && size > 0 && !di->plt_present) { 1782 di->plt_present = True; 1783 di->plt_avma = svma + rw_bias; 1784 di->plt_size = size; 1785 TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma); 1786 } else 1787 if ((!inrw) && (!inrx) && size > 0 && !di->plt_present) { 1788 /* File contains a .plt, but it didn't get mapped. 1789 Presumably it is not required on this platform. At 1790 least don't reject the situation as invalid. */ 1791 di->plt_present = True; 1792 di->plt_avma = 0; 1793 di->plt_size = 0; 1794 } else { 1795 BAD(".plt"); 1796 } 1797 } 1798 # else 1799 # error "Unsupported platform" 1800 # endif 1801 1802 /* Accept .opd where mapped as rw (data) */ 1803 if (0 == VG_(strcmp)(name, ".opd")) { 1804 if (inrw && size > 0 && !di->opd_present) { 1805 di->opd_present = True; 1806 di->opd_avma = svma + rw_bias; 1807 di->opd_size = size; 1808 TRACE_SYMTAB("acquiring .opd avma = %#lx\n", di->opd_avma); 1809 } else { 1810 BAD(".opd"); 1811 } 1812 } 1813 1814 /* Accept .eh_frame where mapped as rx (code). This seems to be 1815 the common case. However, if that doesn't pan out, try for 1816 rw (data) instead. */ 1817 if (0 == VG_(strcmp)(name, ".eh_frame")) { 1818 if (/*inrx && */size > 0 && !di->ehframe_present) { 1819 di->ehframe_present = True; 1820 di->ehframe_avma = svma + rx_bias; 1821 di->ehframe_size = size; 1822 TRACE_SYMTAB("acquiring .eh_frame avma = %#lx\n", di->ehframe_avma); 1823 } else 1824 if (inrw && size > 0 && !di->ehframe_present) { 1825 di->ehframe_present = True; 1826 di->ehframe_avma = svma + rw_bias; 1827 di->ehframe_size = size; 1828 TRACE_SYMTAB("acquiring .eh_frame avma = %#lx\n", di->ehframe_avma); 1829 } else { 1830 BAD(".eh_frame"); 1831 } 1832 } 1833 1834 # undef BAD 1835 1836 } 1837 1838 if (0) VG_(printf)("YYYY text_: avma %#lx size %ld bias %#lx\n", 1839 di->text_avma, di->text_size, di->text_bias); 1840 1841 if (VG_(clo_verbosity) > 2 || VG_(clo_trace_redir)) 1842 VG_(message)(Vg_DebugMsg, " svma %#010lx, avma %#010lx\n", 1843 di->text_avma - di->text_bias, 1844 di->text_avma ); 1845 1846 TRACE_SYMTAB("\n"); 1847 TRACE_SYMTAB("------ Finding image addresses " 1848 "for debug-info sections ------\n"); 1849 1850 /* Find interesting sections, read the symbol table(s), read any debug 1851 information */ 1852 { 1853 /* IMAGE addresses: pointers to start of sections in the 1854 transiently loaded oimage, not in the fragments of the file 1855 mapped in by the guest's dynamic linker. */ 1856 UChar* strtab_img = NULL; /* .strtab */ 1857 ElfXX_Sym* symtab_img = NULL; /* .symtab */ 1858 UChar* dynstr_img = NULL; /* .dynstr */ 1859 ElfXX_Sym* dynsym_img = NULL; /* .dynsym */ 1860 UChar* debuglink_img = NULL; /* .gnu_debuglink */ 1861 UChar* stab_img = NULL; /* .stab (stabs) */ 1862 UChar* stabstr_img = NULL; /* .stabstr (stabs) */ 1863 UChar* debug_line_img = NULL; /* .debug_line (dwarf2) */ 1864 UChar* debug_info_img = NULL; /* .debug_info (dwarf2) */ 1865 UChar* debug_abbv_img = NULL; /* .debug_abbrev (dwarf2) */ 1866 UChar* debug_str_img = NULL; /* .debug_str (dwarf2) */ 1867 UChar* debug_ranges_img = NULL; /* .debug_ranges (dwarf2) */ 1868 UChar* debug_loc_img = NULL; /* .debug_loc (dwarf2) */ 1869 UChar* debug_frame_img = NULL; /* .debug_frame (dwarf2) */ 1870 UChar* dwarf1d_img = NULL; /* .debug (dwarf1) */ 1871 UChar* dwarf1l_img = NULL; /* .line (dwarf1) */ 1872 UChar* ehframe_img = NULL; /* .eh_frame (dwarf2) */ 1873 UChar* opd_img = NULL; /* .opd (dwarf2, 1874 ppc64-linux) */ 1875 /* Section sizes, in bytes */ 1876 SizeT strtab_sz = 0; 1877 SizeT symtab_sz = 0; 1878 SizeT dynstr_sz = 0; 1879 SizeT dynsym_sz = 0; 1880 SizeT debuglink_sz = 0; 1881 SizeT stab_sz = 0; 1882 SizeT stabstr_sz = 0; 1883 SizeT debug_line_sz = 0; 1884 SizeT debug_info_sz = 0; 1885 SizeT debug_abbv_sz = 0; 1886 SizeT debug_str_sz = 0; 1887 SizeT debug_ranges_sz = 0; 1888 SizeT debug_loc_sz = 0; 1889 SizeT debug_frame_sz = 0; 1890 SizeT dwarf1d_sz = 0; 1891 SizeT dwarf1l_sz = 0; 1892 SizeT ehframe_sz = 0; 1893 SizeT opd_sz_unused = 0; 1894 1895 /* Find all interesting sections */ 1896 1897 /* What FIND does: it finds the section called SEC_NAME. The 1898 size of it is assigned to SEC_SIZE. The address of the 1899 section in the transiently loaded oimage is assigned to 1900 SEC_FILEA. Even for sections which are marked loadable, the 1901 client's ld.so may not have loaded them yet, so there is no 1902 guarantee that we can safely prod around in any such area). 1903 Because the entire object file is transiently mapped aboard 1904 for inspection, it's always safe to inspect that area. */ 1905 1906 for (i = 0; i < ehdr_img->e_shnum; i++) { 1907 1908 # define FIND(sec_name, sec_size, sec_img) \ 1909 do { ElfXX_Shdr* shdr \ 1910 = INDEX_BIS( shdr_img, i, shdr_ent_szB ); \ 1911 if (0 == VG_(strcmp)(sec_name, shdr_strtab_img \ 1912 + shdr->sh_name)) { \ 1913 Bool nobits; \ 1914 sec_img = (void*)(oimage + shdr->sh_offset); \ 1915 sec_size = shdr->sh_size; \ 1916 nobits = shdr->sh_type == SHT_NOBITS; \ 1917 TRACE_SYMTAB( "%18s: img %p .. %p\n", \ 1918 sec_name, (UChar*)sec_img, \ 1919 ((UChar*)sec_img) + sec_size - 1); \ 1920 /* SHT_NOBITS sections have zero size in the file. */ \ 1921 if ( shdr->sh_offset \ 1922 + (nobits ? 0 : sec_size) > n_oimage ) { \ 1923 ML_(symerr)(di, True, \ 1924 " section beyond image end?!"); \ 1925 goto out; \ 1926 } \ 1927 } \ 1928 } while (0); 1929 1930 /* NAME SIZE IMAGE addr */ 1931 FIND(".dynsym", dynsym_sz, dynsym_img) 1932 FIND(".dynstr", dynstr_sz, dynstr_img) 1933 FIND(".symtab", symtab_sz, symtab_img) 1934 FIND(".strtab", strtab_sz, strtab_img) 1935 1936 FIND(".gnu_debuglink", debuglink_sz, debuglink_img) 1937 1938 FIND(".stab", stab_sz, stab_img) 1939 FIND(".stabstr", stabstr_sz, stabstr_img) 1940 1941 FIND(".debug_line", debug_line_sz, debug_line_img) 1942 FIND(".debug_info", debug_info_sz, debug_info_img) 1943 FIND(".debug_abbrev", debug_abbv_sz, debug_abbv_img) 1944 FIND(".debug_str", debug_str_sz, debug_str_img) 1945 FIND(".debug_ranges", debug_ranges_sz, debug_ranges_img) 1946 FIND(".debug_loc", debug_loc_sz, debug_loc_img) 1947 FIND(".debug_frame", debug_frame_sz, debug_frame_img) 1948 1949 FIND(".debug", dwarf1d_sz, dwarf1d_img) 1950 FIND(".line", dwarf1l_sz, dwarf1l_img) 1951 FIND(".eh_frame", ehframe_sz, ehframe_img) 1952 1953 FIND(".opd", opd_sz_unused, opd_img) 1954 1955 # undef FIND 1956 } 1957 1958 /* Look for a build-id */ 1959 buildid = find_buildid(oimage, n_oimage); 1960 1961 /* Look for a debug image */ 1962 if (buildid != NULL || debuglink_img != NULL) { 1963 /* Do have a debuglink section? */ 1964 if (debuglink_img != NULL) { 1965 UInt crc_offset = VG_ROUNDUP(VG_(strlen)(debuglink_img)+1, 4); 1966 UInt crc; 1967 1968 vg_assert(crc_offset + sizeof(UInt) <= debuglink_sz); 1969 1970 /* Extract the CRC from the debuglink section */ 1971 crc = *(UInt *)(debuglink_img + crc_offset); 1972 1973 /* See if we can find a matching debug file */ 1974 dimage = find_debug_file( di, di->filename, buildid, 1975 debuglink_img, crc, &n_dimage ); 1976 } else { 1977 /* See if we can find a matching debug file */ 1978 dimage = find_debug_file( di, di->filename, buildid, NULL, 0, &n_dimage ); 1979 } 1980 1981 ML_(dinfo_free)(buildid); 1982 1983 if (dimage != 0 1984 && n_dimage >= sizeof(ElfXX_Ehdr) 1985 && ML_(is_elf_object_file)((void*)dimage, n_dimage)) { 1986 1987 /* Pull out and validate program header and section header info */ 1988 ElfXX_Ehdr* ehdr_dimg = (ElfXX_Ehdr*)dimage; 1989 ElfXX_Phdr* phdr_dimg = (ElfXX_Phdr*)( ((UChar*)ehdr_dimg) 1990 + ehdr_dimg->e_phoff ); 1991 UWord phdr_dnent = ehdr_dimg->e_phnum; 1992 UWord phdr_dent_szB = ehdr_dimg->e_phentsize; 1993 ElfXX_Shdr* shdr_dimg = (ElfXX_Shdr*)( ((UChar*)ehdr_dimg) 1994 + ehdr_dimg->e_shoff ); 1995 UWord shdr_dnent = ehdr_dimg->e_shnum; 1996 UWord shdr_dent_szB = ehdr_dimg->e_shentsize; 1997 UChar* shdr_strtab_dimg = NULL; 1998 1999 /* SVMAs covered by rx and rw segments and corresponding bias. */ 2000 Addr rx_dsvma_base = 0; 2001 Addr rx_dsvma_limit = 0; 2002 PtrdiffT rx_dbias = 0; 2003 Addr rw_dsvma_base = 0; 2004 Addr rw_dsvma_limit = 0; 2005 PtrdiffT rw_dbias = 0; 2006 2007 Bool need_symtab, need_stabs, need_dwarf2, need_dwarf1; 2008 2009 if (phdr_dnent == 0 2010 || !contained_within( 2011 dimage, n_dimage, 2012 (Addr)phdr_dimg, phdr_dnent * phdr_dent_szB)) { 2013 ML_(symerr)(di, True, 2014 "Missing or invalid ELF Program Header Table" 2015 " (debuginfo file)"); 2016 goto out; 2017 } 2018 2019 if (shdr_dnent == 0 2020 || !contained_within( 2021 dimage, n_dimage, 2022 (Addr)shdr_dimg, shdr_dnent * shdr_dent_szB)) { 2023 ML_(symerr)(di, True, 2024 "Missing or invalid ELF Section Header Table" 2025 " (debuginfo file)"); 2026 goto out; 2027 } 2028 2029 /* Also find the section header's string table, and validate. */ 2030 /* checked previously by is_elf_object_file: */ 2031 vg_assert( ehdr_dimg->e_shstrndx != SHN_UNDEF ); 2032 2033 shdr_strtab_dimg 2034 = (UChar*)( ((UChar*)ehdr_dimg) 2035 + shdr_dimg[ehdr_dimg->e_shstrndx].sh_offset); 2036 if (!contained_within( 2037 dimage, n_dimage, 2038 (Addr)shdr_strtab_dimg, 2039 1/*bogus, but we don't know the real size*/ )) { 2040 ML_(symerr)(di, True, 2041 "Invalid ELF Section Header String Table" 2042 " (debuginfo file)"); 2043 goto out; 2044 } 2045 2046 need_symtab = (NULL == symtab_img); 2047 need_stabs = (NULL == stab_img); 2048 need_dwarf2 = (NULL == debug_info_img); 2049 need_dwarf1 = (NULL == dwarf1d_img); 2050 2051 for (i = 0; i < ehdr_dimg->e_phnum; i++) { 2052 ElfXX_Phdr* phdr 2053 = INDEX_BIS( (void*)(dimage + ehdr_dimg->e_phoff), 2054 i, phdr_ent_szB ); 2055 if (phdr->p_type == PT_LOAD) { 2056 if (rx_dsvma_limit == 0 2057 && phdr->p_offset >= di->rx_map_foff 2058 && phdr->p_offset < di->rx_map_foff + di->rx_map_size 2059 && phdr->p_offset + phdr->p_filesz <= di->rx_map_foff + di->rx_map_size) { 2060 rx_dsvma_base = phdr->p_vaddr; 2061 rx_dsvma_limit = phdr->p_vaddr + phdr->p_memsz; 2062 rx_dbias = di->rx_map_avma - di->rx_map_foff + phdr->p_offset - phdr->p_vaddr; 2063 } 2064 else if (rw_dsvma_limit == 0 2065 && phdr->p_offset >= di->rw_map_foff 2066 && phdr->p_offset < di->rw_map_foff + di->rw_map_size 2067 && phdr->p_offset + phdr->p_filesz <= di->rw_map_foff + di->rw_map_size) { 2068 rw_dsvma_base = phdr->p_vaddr; 2069 rw_dsvma_limit = phdr->p_vaddr + phdr->p_memsz; 2070 rw_dbias = di->rw_map_avma - di->rw_map_foff + phdr->p_offset - phdr->p_vaddr; 2071 } 2072 } 2073 } 2074 2075 /* Find all interesting sections */ 2076 for (i = 0; i < ehdr_dimg->e_shnum; i++) { 2077 2078 /* Find debug svma and bias information for sections 2079 we found in the main file. */ 2080 2081 # define FIND(sec, seg) \ 2082 do { ElfXX_Shdr* shdr \ 2083 = INDEX_BIS( shdr_dimg, i, shdr_dent_szB ); \ 2084 if (di->sec##_present \ 2085 && 0 == VG_(strcmp)("." #sec, \ 2086 shdr_strtab_dimg + shdr->sh_name)) { \ 2087 vg_assert(di->sec##_size == shdr->sh_size); \ 2088 vg_assert(di->sec##_avma + shdr->sh_addr + seg##_dbias); \ 2089 di->sec##_debug_svma = shdr->sh_addr; \ 2090 di->sec##_debug_bias = seg##_dbias; \ 2091 TRACE_SYMTAB("acquiring ." #sec " debug svma = %#lx .. %#lx\n", \ 2092 di->sec##_debug_svma, \ 2093 di->sec##_debug_svma + di->sec##_size - 1); \ 2094 TRACE_SYMTAB("acquiring ." #sec " debug bias = %#lx\n", \ 2095 di->sec##_debug_bias); \ 2096 } \ 2097 } while (0); 2098 2099 /* SECTION SEGMENT */ 2100 FIND(text, rx) 2101 FIND(data, rw) 2102 FIND(sdata, rw) 2103 FIND(rodata, rw) 2104 FIND(bss, rw) 2105 FIND(sbss, rw) 2106 2107 # undef FIND 2108 2109 /* Same deal as previous FIND, except only do it for those 2110 sections for which we didn't find anything useful in 2111 the main file. */ 2112 2113 # define FIND(condition, sec_name, sec_size, sec_img) \ 2114 do { ElfXX_Shdr* shdr \ 2115 = INDEX_BIS( shdr_dimg, i, shdr_dent_szB ); \ 2116 if (condition \ 2117 && 0 == VG_(strcmp)(sec_name, \ 2118 shdr_strtab_dimg + shdr->sh_name)) { \ 2119 Bool nobits; \ 2120 if (0 != sec_img) \ 2121 VG_(core_panic)("repeated section!\n"); \ 2122 sec_img = (void*)(dimage + shdr->sh_offset); \ 2123 sec_size = shdr->sh_size; \ 2124 nobits = shdr->sh_type == SHT_NOBITS; \ 2125 TRACE_SYMTAB( "%18s: dimg %p .. %p\n", \ 2126 sec_name, \ 2127 (UChar*)sec_img, \ 2128 ((UChar*)sec_img) + sec_size - 1); \ 2129 /* SHT_NOBITS sections have zero size in the file. */ \ 2130 if ( shdr->sh_offset \ 2131 + (nobits ? 0 : sec_size) > n_dimage ) { \ 2132 ML_(symerr)(di, True, \ 2133 " section beyond image end?!"); \ 2134 goto out; \ 2135 } \ 2136 } \ 2137 } while (0); 2138 2139 /* NEEDED? NAME SIZE IMAGE addr */ 2140 FIND(need_symtab, ".symtab", symtab_sz, symtab_img) 2141 FIND(need_symtab, ".strtab", strtab_sz, strtab_img) 2142 FIND(need_stabs, ".stab", stab_sz, stab_img) 2143 FIND(need_stabs, ".stabstr", stabstr_sz, stabstr_img) 2144 FIND(need_dwarf2, ".debug_line", debug_line_sz, debug_line_img) 2145 FIND(need_dwarf2, ".debug_info", debug_info_sz, debug_info_img) 2146 FIND(need_dwarf2, ".debug_abbrev", debug_abbv_sz, debug_abbv_img) 2147 FIND(need_dwarf2, ".debug_str", debug_str_sz, debug_str_img) 2148 FIND(need_dwarf2, ".debug_ranges", debug_ranges_sz, 2149 debug_ranges_img) 2150 FIND(need_dwarf2, ".debug_loc", debug_loc_sz, debug_loc_img) 2151 FIND(need_dwarf2, ".debug_frame", debug_frame_sz, 2152 debug_frame_img) 2153 FIND(need_dwarf1, ".debug", dwarf1d_sz, dwarf1d_img) 2154 FIND(need_dwarf1, ".line", dwarf1l_sz, dwarf1l_img) 2155 2156 # undef FIND 2157 } 2158 } 2159 } 2160 2161 /* Check some sizes */ 2162 vg_assert((dynsym_sz % sizeof(ElfXX_Sym)) == 0); 2163 vg_assert((symtab_sz % sizeof(ElfXX_Sym)) == 0); 2164 2165 /* Read symbols */ 2166 { 2167 void (*read_elf_symtab)(struct _DebugInfo*,UChar*, 2168 ElfXX_Sym*,SizeT, 2169 UChar*,SizeT, 2170 Bool,UChar*); 2171 Bool symtab_in_debug; 2172 # if defined(VGP_ppc64_linux) 2173 read_elf_symtab = read_elf_symtab__ppc64_linux; 2174 # else 2175 read_elf_symtab = read_elf_symtab__normal; 2176 # endif 2177 symtab_in_debug = (Addr)symtab_img >= dimage 2178 && (Addr)symtab_img < dimage + n_dimage; 2179 read_elf_symtab(di, "symbol table", 2180 symtab_img, symtab_sz, 2181 strtab_img, strtab_sz, 2182 symtab_in_debug, opd_img); 2183 2184 read_elf_symtab(di, "dynamic symbol table", 2185 dynsym_img, dynsym_sz, 2186 dynstr_img, dynstr_sz, 2187 False, opd_img); 2188 } 2189 2190 /* Read .eh_frame and .debug_frame (call-frame-info) if any */ 2191 if (ehframe_img) { 2192 vg_assert(ehframe_sz == di->ehframe_size); 2193 ML_(read_callframe_info_dwarf3)( di, ehframe_img, ehframe_sz, True ); 2194 } 2195 if (debug_frame_sz) { 2196 ML_(read_callframe_info_dwarf3)( di, debug_frame_img, 2197 debug_frame_sz, False ); 2198 } 2199 2200 /* Read the stabs and/or dwarf2 debug information, if any. It 2201 appears reading stabs stuff on amd64-linux doesn't work, so 2202 we ignore it. */ 2203 # if !defined(VGP_amd64_linux) 2204 if (stab_img && stabstr_img) { 2205 ML_(read_debuginfo_stabs) ( di, stab_img, stab_sz, 2206 stabstr_img, stabstr_sz ); 2207 } 2208 # endif 2209 /* jrs 2006-01-01: icc-8.1 has been observed to generate 2210 binaries without debug_str sections. Don't preclude 2211 debuginfo reading for that reason, but, in 2212 read_unitinfo_dwarf2, do check that debugstr is non-NULL 2213 before using it. */ 2214 if (debug_info_img && debug_abbv_img && debug_line_img 2215 /* && debug_str_img */) { 2216 2217 /* The old reader: line numbers and unwind info only */ 2218 ML_(read_debuginfo_dwarf3) ( di, 2219 debug_info_img, debug_info_sz, 2220 debug_abbv_img, debug_abbv_sz, 2221 debug_line_img, debug_line_sz, 2222 debug_str_img, debug_str_sz ); 2223 2224 /* The new reader: read the DIEs in .debug_info to acquire 2225 information on variable types and locations. But only if 2226 the tool asks for it, or the user requests it on the 2227 command line. */ 2228 if (VG_(needs).var_info /* the tool requires it */ 2229 || VG_(clo_read_var_info) /* the user asked for it */) { 2230 ML_(new_dwarf3_reader)( 2231 di, debug_info_img, debug_info_sz, 2232 debug_abbv_img, debug_abbv_sz, 2233 debug_line_img, debug_line_sz, 2234 debug_str_img, debug_str_sz, 2235 debug_ranges_img, debug_ranges_sz, 2236 debug_loc_img, debug_loc_sz 2237 ); 2238 } 2239 } 2240 if (dwarf1d_img && dwarf1l_img) { 2241 ML_(read_debuginfo_dwarf1) ( di, dwarf1d_img, dwarf1d_sz, 2242 dwarf1l_img, dwarf1l_sz ); 2243 } 2244 } 2245 res = True; 2246 2247 out: { 2248 SysRes m_res; 2249 2250 /* Last, but not least, heave the image(s) back overboard. */ 2251 if (dimage) { 2252 m_res = VG_(am_munmap_valgrind) ( dimage, n_dimage ); 2253 vg_assert(!sr_isError(m_res)); 2254 } 2255 m_res = VG_(am_munmap_valgrind) ( oimage, n_oimage ); 2256 vg_assert(!sr_isError(m_res)); 2257 return res; 2258 } 2259 } 2260 2261 #endif // defined(VGO_linux) 2262 2263 /*--------------------------------------------------------------------*/ 2264 /*--- end ---*/ 2265 /*--------------------------------------------------------------------*/ 2266
