readelf.c revision d2be8cc17fed04cbd701e9a2cc1cf365ff45cc44
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@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 114Bool 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 145static 146void 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*/ 203static 204Bool 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). */ 575static 576__attribute__((unused)) /* not referred to on all targets */ 577void 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 653typedef 654 struct { 655 Addr addr; 656 UChar* name; 657 } 658 TempSymKey; 659 660typedef 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 671static 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 677static 678__attribute__((unused)) /* not referred to on all targets */ 679void 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 */ 864static 865Char *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 */ 912static UInt 913calc_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 */ 982static 983Addr 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 */ 1047static 1048Addr 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 addr = open_debug_file(debugpath, NULL, crc, size); 1088 } 1089 } 1090 1091 ML_(dinfo_free)(objdir); 1092 } 1093 1094 if (addr) { 1095 TRACE_SYMTAB("\n"); 1096 TRACE_SYMTAB("------ Found a debuginfo file: %s\n", debugpath); 1097 } 1098 1099 ML_(dinfo_free)(debugpath); 1100 1101 return addr; 1102} 1103 1104 1105static Bool contained_within ( Addr outer, UWord n_outer, 1106 Addr inner, UWord n_inner ) 1107{ 1108 if (n_outer == 0 || n_inner == 0) 1109 return False; 1110 /* Simplistic .. assumes no wraparound (reasonably enough) */ 1111 if (inner >= outer && inner+n_inner <= outer+n_outer) 1112 return True; 1113 return False; 1114} 1115 1116static void* INDEX_BIS ( void* base, Word idx, Word scale ) { 1117 return (void*)( ((UChar*)base) + idx * scale ); 1118} 1119 1120 1121/* Find the file offset corresponding to SVMA by using the program 1122 headers. This is taken from binutils-2.17/binutils/readelf.c 1123 offset_from_vma(). */ 1124static 1125Word file_offset_from_svma ( /*OUT*/Bool* ok, 1126 Addr svma, 1127 ElfXX_Phdr* phdr_img, 1128 Word phdr_nent, 1129 Word phdr_ent_szB ) 1130{ 1131 Word i; 1132 ElfXX_Phdr* seg; 1133 for (i = 0; i < phdr_nent; i++) { 1134 seg = INDEX_BIS( phdr_img, i, phdr_ent_szB ); 1135 if (seg->p_type != PT_LOAD) 1136 continue; 1137 if (svma >= (seg->p_vaddr & -seg->p_align) 1138 && svma + 1 <= seg->p_vaddr + seg->p_filesz) { 1139 *ok = True; 1140 return svma - seg->p_vaddr + seg->p_offset; 1141 } 1142 } 1143 *ok = False; 1144 return 0; 1145} 1146 1147/* The central function for reading ELF debug info. For the 1148 object/exe specified by the DebugInfo, find ELF sections, then read 1149 the symbols, line number info, file name info, CFA (stack-unwind 1150 info) and anything else we want, into the tables within the 1151 supplied DebugInfo. 1152*/ 1153Bool ML_(read_elf_debug_info) ( struct _DebugInfo* di ) 1154{ 1155 Bool res, ok; 1156 SysRes fd, sres; 1157 Word i; 1158 Bool dynbss_present = False; 1159 Bool sdynbss_present = False; 1160 1161 /* Image addresses for the ELF file we're working with. */ 1162 Addr oimage = 0; 1163 UWord n_oimage = 0; 1164 1165 /* Ditto for any ELF debuginfo file that we might happen to load. */ 1166 Addr dimage = 0; 1167 UWord n_dimage = 0; 1168 1169 /* ELF header for the main file. Should == oimage since is at 1170 start of file. */ 1171 ElfXX_Ehdr* ehdr_img = NULL; 1172 1173 /* Program header table image addr, # entries, entry size */ 1174 ElfXX_Phdr* phdr_img = NULL; 1175 UWord phdr_nent = 0; 1176 UWord phdr_ent_szB = 0; 1177 1178 /* Section header image addr, # entries, entry size. Also the 1179 associated string table. */ 1180 ElfXX_Shdr* shdr_img = NULL; 1181 UWord shdr_nent = 0; 1182 UWord shdr_ent_szB = 0; 1183 UChar* shdr_strtab_img = NULL; 1184 1185 /* SVMAs covered by rx and rw segments and corresponding bias. */ 1186 Addr rx_svma_base = 0; 1187 Addr rx_svma_limit = 0; 1188 PtrdiffT rx_bias = 0; 1189 Addr rw_svma_base = 0; 1190 Addr rw_svma_limit = 0; 1191 PtrdiffT rw_bias = 0; 1192 1193 /* Build ID */ 1194 Char* buildid = NULL; 1195 1196 vg_assert(di); 1197 vg_assert(di->have_rx_map == True); 1198 vg_assert(di->have_rw_map == True); 1199 vg_assert(di->rx_map_size > 0); 1200 vg_assert(di->rw_map_size > 0); 1201 vg_assert(di->have_dinfo == False); 1202 vg_assert(di->filename); 1203 vg_assert(!di->memname); 1204 vg_assert(!di->symtab); 1205 vg_assert(!di->loctab); 1206 vg_assert(!di->cfsi); 1207 vg_assert(!di->cfsi_exprs); 1208 vg_assert(!di->strchunks); 1209 vg_assert(!di->soname); 1210 1211 /* If these don't hold true, it means that m_syswrap/m_aspacemgr 1212 managed to do a mapping where the start isn't page aligned. 1213 Which sounds pretty bogus to me. */ 1214 vg_assert(VG_IS_PAGE_ALIGNED(di->rx_map_avma)); 1215 vg_assert(VG_IS_PAGE_ALIGNED(di->rw_map_avma)); 1216 1217 /* ---------------------------------------------------------- 1218 At this point, there is very little information in the 1219 DebugInfo. We only know that something that looks like an ELF 1220 file has been mapped rx-ishly as recorded with the di->*rx_map* 1221 fields and has also been mapped rw-ishly as recorded with the 1222 di->*rw_map* fields. First we examine the file's ELF Program 1223 Header, and, by comparing that against the di->*r{w,x}_map* 1224 info, try to figure out the AVMAs for the sections we care 1225 about, that should have been mapped: text, data, sdata, bss got, 1226 plt, and toc. 1227 ---------------------------------------------------------- */ 1228 1229 res = False; 1230 1231 oimage = (Addr)NULL; 1232 if (VG_(clo_verbosity) > 1 || VG_(clo_trace_redir)) 1233 VG_(message)(Vg_DebugMsg, "Reading syms from %s (%#lx)\n", 1234 di->filename, di->rx_map_avma ); 1235 1236 /* mmap the object image aboard, so that we can read symbols and 1237 line number info out of it. It will be munmapped immediately 1238 thereafter; it is only aboard transiently. */ 1239 1240 fd = VG_(open)(di->filename, VKI_O_RDONLY, 0); 1241 if (sr_isError(fd)) { 1242 ML_(symerr)(di, True, "Can't open .so/.exe to read symbols?!"); 1243 return False; 1244 } 1245 1246 { Long n_oimageLL = VG_(fsize)(sr_Res(fd)); 1247 if (n_oimageLL <= 0) { 1248 ML_(symerr)(di, True, "Can't stat .so/.exe (to determine its size)?!"); 1249 VG_(close)(sr_Res(fd)); 1250 return False; 1251 } 1252 n_oimage = (UWord)(ULong)n_oimageLL; 1253 } 1254 1255 sres = VG_(am_mmap_file_float_valgrind) 1256 ( n_oimage, VKI_PROT_READ, sr_Res(fd), 0 ); 1257 1258 VG_(close)(sr_Res(fd)); 1259 1260 if (sr_isError(sres)) { 1261 VG_(message)(Vg_UserMsg, "warning: mmap failed on %s\n", di->filename ); 1262 VG_(message)(Vg_UserMsg, " no symbols or debug info loaded\n" ); 1263 return False; 1264 } 1265 1266 oimage = sr_Res(sres); 1267 /* Check against wraparound. am_mmap_file_float_valgrind should 1268 not produce a wrapped-around mapping. */ 1269 vg_assert(n_oimage > 0); 1270 vg_assert(oimage + n_oimage > oimage); 1271 1272 if (0) { 1273 VG_(printf)("read_elf_debug_info: OIMAGE = %p - %p\n", 1274 (void*)oimage, (void*)(oimage + (UWord)n_oimage)); 1275 } 1276 1277 /* Ok, the object image is safely in oimage[0 .. n_oimage-1]. Now 1278 verify that it is a valid ELF .so or executable image. */ 1279 res = False; 1280 ok = (n_oimage >= sizeof(ElfXX_Ehdr)); 1281 ehdr_img = (ElfXX_Ehdr*)oimage; 1282 1283 if (ok) 1284 ok &= ML_(is_elf_object_file)(ehdr_img, n_oimage); 1285 1286 if (!ok) { 1287 ML_(symerr)(di, True, "Invalid ELF Header"); 1288 goto out; 1289 } 1290 1291 /* Find where the program and section header tables are, and give 1292 up if either is missing or outside the image (bogus). */ 1293 phdr_img = (ElfXX_Phdr*)( ((UChar*)ehdr_img) + ehdr_img->e_phoff ); 1294 phdr_nent = ehdr_img->e_phnum; 1295 phdr_ent_szB = ehdr_img->e_phentsize; 1296 1297 shdr_img = (ElfXX_Shdr*)( ((UChar*)ehdr_img) + ehdr_img->e_shoff ); 1298 shdr_nent = ehdr_img->e_shnum; 1299 shdr_ent_szB = ehdr_img->e_shentsize; 1300 1301 TRACE_SYMTAB("------ Basic facts about the object ------\n"); 1302 TRACE_SYMTAB("object: img %p n_oimage %ld\n", 1303 (void*)oimage, n_oimage); 1304 TRACE_SYMTAB("phdr: img %p nent %ld ent_szB %ld\n", 1305 phdr_img, phdr_nent, phdr_ent_szB); 1306 TRACE_SYMTAB("shdr: img %p nent %ld ent_szB %ld\n", 1307 shdr_img, shdr_nent, shdr_ent_szB); 1308 1309 if (phdr_nent == 0 1310 || !contained_within( 1311 oimage, n_oimage, 1312 (Addr)phdr_img, phdr_nent * phdr_ent_szB)) { 1313 ML_(symerr)(di, True, "Missing or invalid ELF Program Header Table"); 1314 goto out; 1315 } 1316 1317 if (shdr_nent == 0 1318 || !contained_within( 1319 oimage, n_oimage, 1320 (Addr)shdr_img, shdr_nent * shdr_ent_szB)) { 1321 ML_(symerr)(di, True, "Missing or invalid ELF Section Header Table"); 1322 goto out; 1323 } 1324 1325 /* Also find the section header's string table, and validate. */ 1326 /* checked previously by is_elf_object_file: */ 1327 vg_assert( ehdr_img->e_shstrndx != SHN_UNDEF ); 1328 1329 shdr_strtab_img 1330 = (UChar*)( ((UChar*)ehdr_img) 1331 + shdr_img[ehdr_img->e_shstrndx].sh_offset); 1332 if (!contained_within( oimage, n_oimage, 1333 (Addr)shdr_strtab_img, 1334 1/*bogus, but we don't know the real size*/ )) { 1335 ML_(symerr)(di, True, "Invalid ELF Section Header String Table"); 1336 goto out; 1337 } 1338 1339 TRACE_SYMTAB("shdr: string table at %p\n", shdr_strtab_img ); 1340 1341 /* Do another amazingly tedious thing: find out the .soname for 1342 this object. Apparently requires looking through the program 1343 header table. */ 1344 TRACE_SYMTAB("\n"); 1345 TRACE_SYMTAB("------ Looking for the soname ------\n"); 1346 vg_assert(di->soname == NULL); 1347 { 1348 ElfXX_Addr prev_svma = 0; 1349 1350 for (i = 0; i < phdr_nent; i++) { 1351 ElfXX_Phdr* phdr = INDEX_BIS( phdr_img, i, phdr_ent_szB ); 1352 1353 /* Make sure the PT_LOADable entries are in order */ 1354 if (phdr->p_type == PT_LOAD) { 1355 TRACE_SYMTAB("PT_LOAD in order?: %#lx %#lx\n", 1356 prev_svma + 0UL, 1357 phdr->p_vaddr + 0UL); 1358 if (phdr->p_vaddr < prev_svma) { 1359 ML_(symerr)(di, True, 1360 "ELF Program Headers are not in ascending order"); 1361 goto out; 1362 } 1363 prev_svma = phdr->p_vaddr; 1364 if (rx_svma_limit == 0 1365 && phdr->p_offset >= di->rx_map_foff 1366 && phdr->p_offset < di->rx_map_foff + di->rx_map_size 1367 && phdr->p_offset + phdr->p_filesz <= di->rx_map_foff + di->rx_map_size) { 1368 rx_svma_base = phdr->p_vaddr; 1369 rx_svma_limit = phdr->p_vaddr + phdr->p_memsz; 1370 rx_bias = di->rx_map_avma - di->rx_map_foff + phdr->p_offset - phdr->p_vaddr; 1371 } 1372 else if (rw_svma_limit == 0 1373 && phdr->p_offset >= di->rw_map_foff 1374 && phdr->p_offset < di->rw_map_foff + di->rw_map_size 1375 && phdr->p_offset + phdr->p_filesz <= di->rw_map_foff + di->rw_map_size) { 1376 rw_svma_base = phdr->p_vaddr; 1377 rw_svma_limit = phdr->p_vaddr + phdr->p_memsz; 1378 rw_bias = di->rw_map_avma - di->rw_map_foff + phdr->p_offset - phdr->p_vaddr; 1379 } 1380 } 1381 1382 /* Try to get the soname. If there isn't one, use "NONE". 1383 The seginfo needs to have some kind of soname in order to 1384 facilitate writing redirect functions, since all redirect 1385 specifications require a soname (pattern). */ 1386 if (phdr->p_type == PT_DYNAMIC && di->soname == NULL) { 1387 ElfXX_Dyn* dyn_img = (ElfXX_Dyn*)( ((UChar*)ehdr_img) 1388 + phdr->p_offset); 1389 Word stroff = -1; 1390 UChar* strtab = NULL; 1391 Word j; 1392 for (j = 0; dyn_img[j].d_tag != DT_NULL; j++) { 1393 switch (dyn_img[j].d_tag) { 1394 case DT_SONAME: { 1395 stroff = dyn_img[j].d_un.d_val; 1396 break; 1397 } 1398 case DT_STRTAB: { 1399 Bool ok2 = False; 1400 Word offset = file_offset_from_svma( 1401 &ok2, 1402 dyn_img[j].d_un.d_ptr, 1403 phdr_img, 1404 phdr_nent, phdr_ent_szB 1405 ); 1406 if (ok2 && strtab == NULL) { 1407 vg_assert(offset >= 0 && offset <= n_oimage); 1408 strtab = ((UChar*)ehdr_img) + offset; 1409 } 1410 break; 1411 } 1412 default: 1413 break; 1414 } 1415 } 1416 if (stroff != -1 && strtab != NULL) { 1417 TRACE_SYMTAB("Found soname = %s\n", strtab+stroff); 1418 di->soname = ML_(dinfo_strdup)("di.redi.1", strtab+stroff); 1419 } 1420 } 1421 } /* for (i = 0; i < phdr_nent; i++) ... */ 1422 } /* look for the soname */ 1423 1424 /* If, after looking at all the program headers, we still didn't 1425 find a soname, add a fake one. */ 1426 if (di->soname == NULL) { 1427 TRACE_SYMTAB("No soname found; using (fake) \"NONE\"\n"); 1428 di->soname = "NONE"; 1429 } 1430 1431 vg_assert(rx_svma_limit != 0); 1432 vg_assert(rw_svma_limit != 0); 1433 1434 /* Now read the section table. */ 1435 TRACE_SYMTAB("\n"); 1436 TRACE_SYMTAB("------ Examining the section headers " 1437 "and program headers ------\n"); 1438 TRACE_SYMTAB("rx: at %#lx are mapped foffsets %ld .. %ld\n", 1439 di->rx_map_avma, 1440 di->rx_map_foff, di->rx_map_foff + di->rx_map_size - 1 ); 1441 TRACE_SYMTAB("rx: contains svmas %#lx .. %#lx with bias %#lx\n", 1442 rx_svma_base, rx_svma_limit - 1, rx_bias ); 1443 TRACE_SYMTAB("rw: at %#lx are mapped foffsets %ld .. %ld\n", 1444 di->rw_map_avma, 1445 di->rw_map_foff, di->rw_map_foff + di->rw_map_size - 1 ); 1446 TRACE_SYMTAB("rw: contains svmas %#lx .. %#lx with bias %#lx\n", 1447 rw_svma_base, rw_svma_limit - 1, rw_bias ); 1448 1449 for (i = 0; i < shdr_nent; i++) { 1450 ElfXX_Shdr* shdr = INDEX_BIS( shdr_img, i, shdr_ent_szB ); 1451 UChar* name = shdr_strtab_img + shdr->sh_name; 1452 Addr svma = shdr->sh_addr; 1453 OffT foff = shdr->sh_offset; 1454 UWord size = shdr->sh_size; 1455 UInt alyn = shdr->sh_addralign; 1456 Bool bits = !(shdr->sh_type == SHT_NOBITS); 1457 Bool inrx = svma >= rx_svma_base && svma < rx_svma_limit; 1458 Bool inrw = svma >= rw_svma_base && svma < rw_svma_limit; 1459 1460 TRACE_SYMTAB(" [sec %2ld] %s %s al%2u foff %6ld .. %6ld " 1461 " svma %p name \"%s\"\n", 1462 i, inrx ? "rx" : " ", inrw ? "rw" : " ", alyn, 1463 foff, foff+size-1, (void*)svma, name ); 1464 1465 /* Check for sane-sized segments. SHT_NOBITS sections have zero 1466 size in the file. */ 1467 if ((foff >= n_oimage) || (foff + (bits ? size : 0) > n_oimage)) { 1468 ML_(symerr)(di, True, "ELF Section extends beyond image end"); 1469 goto out; 1470 } 1471 1472 /* Check for a sane alignment value. */ 1473 if (alyn > 0 && -1 == VG_(log2)(alyn)) { 1474 ML_(symerr)(di, True, "ELF Section contains invalid " 1475 ".sh_addralign value"); 1476 goto out; 1477 } 1478 1479# define BAD(_secname) \ 1480 do { ML_(symerr)(di, True, \ 1481 "Can't make sense of " _secname \ 1482 " section mapping"); \ 1483 goto out; \ 1484 } while (0) 1485 1486 /* Find avma-s for: .text .data .sdata .rodata .bss .sbss .plt .got .opd 1487 and .eh_frame */ 1488 1489 /* Accept .text where mapped as rx (code), even if zero-sized */ 1490 if (0 == VG_(strcmp)(name, ".text")) { 1491 if (inrx && size >= 0 && !di->text_present) { 1492 di->text_present = True; 1493 di->text_svma = svma; 1494 di->text_avma = svma + rx_bias; 1495 di->text_size = size; 1496 di->text_bias = rx_bias; 1497 di->text_debug_svma = svma; 1498 di->text_debug_bias = rx_bias; 1499 TRACE_SYMTAB("acquiring .text svma = %#lx .. %#lx\n", 1500 di->text_svma, 1501 di->text_svma + di->text_size - 1); 1502 TRACE_SYMTAB("acquiring .text avma = %#lx .. %#lx\n", 1503 di->text_avma, 1504 di->text_avma + di->text_size - 1); 1505 TRACE_SYMTAB("acquiring .text bias = %#lx\n", di->text_bias); 1506 } else { 1507 BAD(".text"); 1508 } 1509 } 1510 1511 /* Accept .data where mapped as rw (data), even if zero-sized */ 1512 if (0 == VG_(strcmp)(name, ".data")) { 1513 if (inrw && size >= 0 && !di->data_present) { 1514 di->data_present = True; 1515 di->data_svma = svma; 1516 di->data_avma = svma + rw_bias; 1517 di->data_size = size; 1518 di->data_bias = rw_bias; 1519 di->data_debug_svma = svma; 1520 di->data_debug_bias = rw_bias; 1521 TRACE_SYMTAB("acquiring .data svma = %#lx .. %#lx\n", 1522 di->data_svma, 1523 di->data_svma + di->data_size - 1); 1524 TRACE_SYMTAB("acquiring .data avma = %#lx .. %#lx\n", 1525 di->data_avma, 1526 di->data_avma + di->data_size - 1); 1527 TRACE_SYMTAB("acquiring .data bias = %#lx\n", di->data_bias); 1528 } else { 1529 BAD(".data"); 1530 } 1531 } 1532 1533 /* Accept .sdata where mapped as rw (data) */ 1534 if (0 == VG_(strcmp)(name, ".sdata")) { 1535 if (inrw && size > 0 && !di->sdata_present) { 1536 di->sdata_present = True; 1537 di->sdata_svma = svma; 1538 di->sdata_avma = svma + rw_bias; 1539 di->sdata_size = size; 1540 di->sdata_bias = rw_bias; 1541 di->sdata_debug_svma = svma; 1542 di->sdata_debug_bias = rw_bias; 1543 TRACE_SYMTAB("acquiring .sdata svma = %#lx .. %#lx\n", 1544 di->sdata_svma, 1545 di->sdata_svma + di->sdata_size - 1); 1546 TRACE_SYMTAB("acquiring .sdata avma = %#lx .. %#lx\n", 1547 di->sdata_avma, 1548 di->sdata_avma + di->sdata_size - 1); 1549 TRACE_SYMTAB("acquiring .sdata bias = %#lx\n", di->sdata_bias); 1550 } else { 1551 BAD(".sdata"); 1552 } 1553 } 1554 1555 /* Accept .rodata where mapped as rx (data), even if zero-sized */ 1556 if (0 == VG_(strcmp)(name, ".rodata")) { 1557 if (inrx && size >= 0 && !di->rodata_present) { 1558 di->rodata_present = True; 1559 di->rodata_svma = svma; 1560 di->rodata_avma = svma + rx_bias; 1561 di->rodata_size = size; 1562 di->rodata_bias = rx_bias; 1563 di->rodata_debug_svma = svma; 1564 di->rodata_debug_bias = rw_bias; 1565 TRACE_SYMTAB("acquiring .rodata svma = %#lx .. %#lx\n", 1566 di->rodata_svma, 1567 di->rodata_svma + di->rodata_size - 1); 1568 TRACE_SYMTAB("acquiring .rodata avma = %#lx .. %#lx\n", 1569 di->rodata_avma, 1570 di->rodata_avma + di->rodata_size - 1); 1571 TRACE_SYMTAB("acquiring .rodata bias = %#lx\n", di->rodata_bias); 1572 } else { 1573 BAD(".rodata"); 1574 } 1575 } 1576 1577 if (0 == VG_(strcmp)(name, ".dynbss")) { 1578 if (inrw && size > 0 && !di->bss_present) { 1579 dynbss_present = True; 1580 di->bss_present = True; 1581 di->bss_svma = svma; 1582 di->bss_avma = svma + rw_bias; 1583 di->bss_size = size; 1584 di->bss_bias = rw_bias; 1585 di->bss_debug_svma = svma; 1586 di->bss_debug_bias = rw_bias; 1587 TRACE_SYMTAB("acquiring .dynbss svma = %#lx .. %#lx\n", 1588 di->bss_svma, 1589 di->bss_svma + di->bss_size - 1); 1590 TRACE_SYMTAB("acquiring .dynbss avma = %#lx .. %#lx\n", 1591 di->bss_avma, 1592 di->bss_avma + di->bss_size - 1); 1593 TRACE_SYMTAB("acquiring .dynbss bias = %#lx\n", di->bss_bias); 1594 } 1595 } 1596 1597 /* Accept .bss where mapped as rw (data), even if zero-sized */ 1598 if (0 == VG_(strcmp)(name, ".bss")) { 1599 if (inrw && size > 0 && dynbss_present) { 1600 vg_assert(di->bss_present); 1601 dynbss_present = False; 1602 vg_assert(di->bss_svma + di->bss_size == svma); 1603 di->bss_size += size; 1604 TRACE_SYMTAB("acquiring .bss svma = %#lx .. %#lx\n", 1605 svma, svma + size - 1); 1606 TRACE_SYMTAB("acquiring .bss avma = %#lx .. %#lx\n", 1607 svma + rw_bias, svma + rw_bias + size - 1); 1608 TRACE_SYMTAB("acquiring .bss bias = %#lx\n", di->bss_bias); 1609 } else 1610 1611 if (inrw && size >= 0 && !di->bss_present) { 1612 di->bss_present = True; 1613 di->bss_svma = svma; 1614 di->bss_avma = svma + rw_bias; 1615 di->bss_size = size; 1616 di->bss_bias = rw_bias; 1617 di->bss_debug_svma = svma; 1618 di->bss_debug_bias = rw_bias; 1619 TRACE_SYMTAB("acquiring .bss svma = %#lx .. %#lx\n", 1620 di->bss_svma, 1621 di->bss_svma + di->bss_size - 1); 1622 TRACE_SYMTAB("acquiring .bss avma = %#lx .. %#lx\n", 1623 di->bss_avma, 1624 di->bss_avma + di->bss_size - 1); 1625 TRACE_SYMTAB("acquiring .bss bias = %#lx\n", di->bss_bias); 1626 } else 1627 1628 /* Now one from the wtf?! department ... */ 1629 if (inrx && (!inrw) && size >= 0 && !di->bss_present) { 1630 /* File contains a .bss, but it got mapped as rx only. 1631 This is very strange. For now, just pretend we didn't 1632 see it :-) */ 1633 di->bss_present = False; 1634 di->bss_svma = 0; 1635 di->bss_avma = 0; 1636 di->bss_size = 0; 1637 di->bss_bias = 0; 1638 di->bss_debug_svma = 0; 1639 di->bss_debug_bias = 0; 1640 if (!VG_(clo_xml)) { 1641 VG_(message)(Vg_UserMsg, 1642 "Warning: the following file's .bss is " 1643 "mapped r-x only - ignoring .bss syms\n"); 1644 VG_(message)(Vg_UserMsg, " %s\n", di->filename 1645 ? di->filename 1646 : (UChar*)"(null?!)" ); 1647 } 1648 } else 1649 1650 if ((!inrw) && (!inrx) && size >= 0 && !di->bss_present) { 1651 /* File contains a .bss, but it didn't get mapped. Ignore. */ 1652 di->bss_present = False; 1653 di->bss_svma = 0; 1654 di->bss_avma = 0; 1655 di->bss_size = 0; 1656 di->bss_bias = 0; 1657 } else { 1658 BAD(".bss"); 1659 } 1660 } 1661 1662 if (0 == VG_(strcmp)(name, ".sdynbss")) { 1663 if (inrw && size >= 0 && !di->sbss_present) { 1664 sdynbss_present = True; 1665 di->sbss_present = True; 1666 di->sbss_svma = svma; 1667 di->sbss_avma = svma + rw_bias; 1668 di->sbss_size = size; 1669 di->sbss_bias = rw_bias; 1670 di->sbss_debug_svma = svma; 1671 di->sbss_debug_bias = rw_bias; 1672 TRACE_SYMTAB("acquiring .sdynbss svma = %#lx .. %#lx\n", 1673 di->sbss_svma, 1674 di->sbss_svma + di->sbss_size - 1); 1675 TRACE_SYMTAB("acquiring .sdynbss avma = %#lx .. %#lx\n", 1676 di->sbss_avma, 1677 di->sbss_avma + di->sbss_size - 1); 1678 TRACE_SYMTAB("acquiring .sdynbss bias = %#lx\n", di->sbss_bias); 1679 } 1680 } 1681 1682 /* Accept .sbss where mapped as rw (data) */ 1683 if (0 == VG_(strcmp)(name, ".sbss")) { 1684 if (inrw && size > 0 && sdynbss_present) { 1685 vg_assert(di->sbss_present); 1686 sdynbss_present = False; 1687 vg_assert(di->sbss_svma + di->sbss_size == svma); 1688 di->sbss_size += size; 1689 TRACE_SYMTAB("acquiring .sbss svma = %#lx .. %#lx\n", 1690 svma, svma + size - 1); 1691 TRACE_SYMTAB("acquiring .sbss avma = %#lx .. %#lx\n", 1692 svma + rw_bias, svma + rw_bias + size - 1); 1693 TRACE_SYMTAB("acquiring .sbss bias = %#lx\n", di->sbss_bias); 1694 } else 1695 1696 if (inrw && size > 0 && !di->sbss_present) { 1697 di->sbss_present = True; 1698 di->sbss_svma = svma; 1699 di->sbss_avma = svma + rw_bias; 1700 di->sbss_size = size; 1701 di->sbss_bias = rw_bias; 1702 di->sbss_debug_svma = svma; 1703 di->sbss_debug_bias = rw_bias; 1704 TRACE_SYMTAB("acquiring .sbss svma = %#lx .. %#lx\n", 1705 di->sbss_svma, 1706 di->sbss_svma + di->sbss_size - 1); 1707 TRACE_SYMTAB("acquiring .sbss avma = %#lx .. %#lx\n", 1708 di->sbss_avma, 1709 di->sbss_avma + di->sbss_size - 1); 1710 TRACE_SYMTAB("acquiring .sbss bias = %#lx\n", di->sbss_bias); 1711 } else { 1712 BAD(".sbss"); 1713 } 1714 } 1715 1716 /* Accept .got where mapped as rw (data) */ 1717 if (0 == VG_(strcmp)(name, ".got")) { 1718 if (inrw && size > 0 && !di->got_present) { 1719 di->got_present = True; 1720 di->got_avma = svma + rw_bias; 1721 di->got_size = size; 1722 TRACE_SYMTAB("acquiring .got avma = %#lx\n", di->got_avma); 1723 } else { 1724 BAD(".got"); 1725 } 1726 } 1727 1728 /* Accept .got.plt where mapped as rw (data) */ 1729 if (0 == VG_(strcmp)(name, ".got.plt")) { 1730 if (inrw && size > 0 && !di->gotplt_present) { 1731 di->gotplt_present = True; 1732 di->gotplt_avma = svma + rw_bias; 1733 di->gotplt_size = size; 1734 TRACE_SYMTAB("acquiring .got.plt avma = %#lx\n", di->gotplt_avma); 1735 } else if (size != 0) { 1736 BAD(".got.plt"); 1737 } 1738 } 1739 1740 /* PLT is different on different platforms, it seems. */ 1741# if defined(VGP_x86_linux) || defined(VGP_amd64_linux) \ 1742 || defined(VGP_arm_linux) || defined (VGP_s390x_linux) 1743 /* Accept .plt where mapped as rx (code) */ 1744 if (0 == VG_(strcmp)(name, ".plt")) { 1745 if (inrx && size > 0 && !di->plt_present) { 1746 di->plt_present = True; 1747 di->plt_avma = svma + rx_bias; 1748 di->plt_size = size; 1749 TRACE_SYMTAB("acquiring .plt avma = %#lx\n", di->plt_avma); 1750 } else { 1751 BAD(".plt"); 1752 } 1753 } 1754# elif defined(VGP_ppc32_linux) 1755 /* Accept .plt where mapped as rw (data) */ 1756 if (0 == VG_(strcmp)(name, ".plt")) { 1757 if (inrw && size > 0 && !di->plt_present) { 1758 di->plt_present = True; 1759 di->plt_avma = svma + rw_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_ppc64_linux) 1767 /* Accept .plt where mapped as rw (data), or unmapped */ 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 if ((!inrw) && (!inrx) && size > 0 && !di->plt_present) { 1776 /* File contains a .plt, but it didn't get mapped. 1777 Presumably it is not required on this platform. At 1778 least don't reject the situation as invalid. */ 1779 di->plt_present = True; 1780 di->plt_avma = 0; 1781 di->plt_size = 0; 1782 } else { 1783 BAD(".plt"); 1784 } 1785 } 1786# else 1787# error "Unsupported platform" 1788# endif 1789 1790 /* Accept .opd where mapped as rw (data) */ 1791 if (0 == VG_(strcmp)(name, ".opd")) { 1792 if (inrw && size > 0 && !di->opd_present) { 1793 di->opd_present = True; 1794 di->opd_avma = svma + rw_bias; 1795 di->opd_size = size; 1796 TRACE_SYMTAB("acquiring .opd avma = %#lx\n", di->opd_avma); 1797 } else { 1798 BAD(".opd"); 1799 } 1800 } 1801 1802 /* Accept .eh_frame where mapped as rx (code). This seems to be 1803 the common case. However, if that doesn't pan out, try for 1804 rw (data) instead. */ 1805 if (0 == VG_(strcmp)(name, ".eh_frame")) { 1806 if (inrx && size > 0 && !di->ehframe_present) { 1807 di->ehframe_present = True; 1808 di->ehframe_avma = svma + rx_bias; 1809 di->ehframe_size = size; 1810 TRACE_SYMTAB("acquiring .eh_frame avma = %#lx\n", di->ehframe_avma); 1811 } else 1812 if (inrw && size > 0 && !di->ehframe_present) { 1813 di->ehframe_present = True; 1814 di->ehframe_avma = svma + rw_bias; 1815 di->ehframe_size = size; 1816 TRACE_SYMTAB("acquiring .eh_frame avma = %#lx\n", di->ehframe_avma); 1817 } else { 1818 BAD(".eh_frame"); 1819 } 1820 } 1821 1822# undef BAD 1823 1824 } 1825 1826 if (0) VG_(printf)("YYYY text_: avma %#lx size %ld bias %#lx\n", 1827 di->text_avma, di->text_size, di->text_bias); 1828 1829 if (VG_(clo_verbosity) > 2 || VG_(clo_trace_redir)) 1830 VG_(message)(Vg_DebugMsg, " svma %#010lx, avma %#010lx\n", 1831 di->text_avma - di->text_bias, 1832 di->text_avma ); 1833 1834 TRACE_SYMTAB("\n"); 1835 TRACE_SYMTAB("------ Finding image addresses " 1836 "for debug-info sections ------\n"); 1837 1838 /* Find interesting sections, read the symbol table(s), read any debug 1839 information */ 1840 { 1841 /* IMAGE addresses: pointers to start of sections in the 1842 transiently loaded oimage, not in the fragments of the file 1843 mapped in by the guest's dynamic linker. */ 1844 UChar* strtab_img = NULL; /* .strtab */ 1845 ElfXX_Sym* symtab_img = NULL; /* .symtab */ 1846 UChar* dynstr_img = NULL; /* .dynstr */ 1847 ElfXX_Sym* dynsym_img = NULL; /* .dynsym */ 1848 UChar* debuglink_img = NULL; /* .gnu_debuglink */ 1849 UChar* stab_img = NULL; /* .stab (stabs) */ 1850 UChar* stabstr_img = NULL; /* .stabstr (stabs) */ 1851 UChar* debug_line_img = NULL; /* .debug_line (dwarf2) */ 1852 UChar* debug_info_img = NULL; /* .debug_info (dwarf2) */ 1853 UChar* debug_abbv_img = NULL; /* .debug_abbrev (dwarf2) */ 1854 UChar* debug_str_img = NULL; /* .debug_str (dwarf2) */ 1855 UChar* debug_ranges_img = NULL; /* .debug_ranges (dwarf2) */ 1856 UChar* debug_loc_img = NULL; /* .debug_loc (dwarf2) */ 1857 UChar* debug_frame_img = NULL; /* .debug_frame (dwarf2) */ 1858 UChar* dwarf1d_img = NULL; /* .debug (dwarf1) */ 1859 UChar* dwarf1l_img = NULL; /* .line (dwarf1) */ 1860 UChar* ehframe_img = NULL; /* .eh_frame (dwarf2) */ 1861 UChar* opd_img = NULL; /* .opd (dwarf2, 1862 ppc64-linux) */ 1863 /* Section sizes, in bytes */ 1864 SizeT strtab_sz = 0; 1865 SizeT symtab_sz = 0; 1866 SizeT dynstr_sz = 0; 1867 SizeT dynsym_sz = 0; 1868 SizeT debuglink_sz = 0; 1869 SizeT stab_sz = 0; 1870 SizeT stabstr_sz = 0; 1871 SizeT debug_line_sz = 0; 1872 SizeT debug_info_sz = 0; 1873 SizeT debug_abbv_sz = 0; 1874 SizeT debug_str_sz = 0; 1875 SizeT debug_ranges_sz = 0; 1876 SizeT debug_loc_sz = 0; 1877 SizeT debug_frame_sz = 0; 1878 SizeT dwarf1d_sz = 0; 1879 SizeT dwarf1l_sz = 0; 1880 SizeT ehframe_sz = 0; 1881 SizeT opd_sz_unused = 0; 1882 1883 /* Find all interesting sections */ 1884 1885 /* What FIND does: it finds the section called SEC_NAME. The 1886 size of it is assigned to SEC_SIZE. The address of the 1887 section in the transiently loaded oimage is assigned to 1888 SEC_FILEA. Even for sections which are marked loadable, the 1889 client's ld.so may not have loaded them yet, so there is no 1890 guarantee that we can safely prod around in any such area). 1891 Because the entire object file is transiently mapped aboard 1892 for inspection, it's always safe to inspect that area. */ 1893 1894 for (i = 0; i < ehdr_img->e_shnum; i++) { 1895 1896# define FIND(sec_name, sec_size, sec_img) \ 1897 do { ElfXX_Shdr* shdr \ 1898 = INDEX_BIS( shdr_img, i, shdr_ent_szB ); \ 1899 if (0 == VG_(strcmp)(sec_name, shdr_strtab_img \ 1900 + shdr->sh_name)) { \ 1901 Bool nobits; \ 1902 sec_img = (void*)(oimage + shdr->sh_offset); \ 1903 sec_size = shdr->sh_size; \ 1904 nobits = shdr->sh_type == SHT_NOBITS; \ 1905 TRACE_SYMTAB( "%18s: img %p .. %p\n", \ 1906 sec_name, (UChar*)sec_img, \ 1907 ((UChar*)sec_img) + sec_size - 1); \ 1908 /* SHT_NOBITS sections have zero size in the file. */ \ 1909 if ( shdr->sh_offset \ 1910 + (nobits ? 0 : sec_size) > n_oimage ) { \ 1911 ML_(symerr)(di, True, \ 1912 " section beyond image end?!"); \ 1913 goto out; \ 1914 } \ 1915 } \ 1916 } while (0); 1917 1918 /* NAME SIZE IMAGE addr */ 1919 FIND(".dynsym", dynsym_sz, dynsym_img) 1920 FIND(".dynstr", dynstr_sz, dynstr_img) 1921 FIND(".symtab", symtab_sz, symtab_img) 1922 FIND(".strtab", strtab_sz, strtab_img) 1923 1924 FIND(".gnu_debuglink", debuglink_sz, debuglink_img) 1925 1926 FIND(".stab", stab_sz, stab_img) 1927 FIND(".stabstr", stabstr_sz, stabstr_img) 1928 1929 FIND(".debug_line", debug_line_sz, debug_line_img) 1930 FIND(".debug_info", debug_info_sz, debug_info_img) 1931 FIND(".debug_abbrev", debug_abbv_sz, debug_abbv_img) 1932 FIND(".debug_str", debug_str_sz, debug_str_img) 1933 FIND(".debug_ranges", debug_ranges_sz, debug_ranges_img) 1934 FIND(".debug_loc", debug_loc_sz, debug_loc_img) 1935 FIND(".debug_frame", debug_frame_sz, debug_frame_img) 1936 1937 FIND(".debug", dwarf1d_sz, dwarf1d_img) 1938 FIND(".line", dwarf1l_sz, dwarf1l_img) 1939 FIND(".eh_frame", ehframe_sz, ehframe_img) 1940 1941 FIND(".opd", opd_sz_unused, opd_img) 1942 1943# undef FIND 1944 } 1945 1946 /* Look for a build-id */ 1947 buildid = find_buildid(oimage, n_oimage); 1948 1949 /* Look for a debug image */ 1950 if (buildid != NULL || debuglink_img != NULL) { 1951 /* Do have a debuglink section? */ 1952 if (debuglink_img != NULL) { 1953 UInt crc_offset = VG_ROUNDUP(VG_(strlen)(debuglink_img)+1, 4); 1954 UInt crc; 1955 1956 vg_assert(crc_offset + sizeof(UInt) <= debuglink_sz); 1957 1958 /* Extract the CRC from the debuglink section */ 1959 crc = *(UInt *)(debuglink_img + crc_offset); 1960 1961 /* See if we can find a matching debug file */ 1962 dimage = find_debug_file( di, di->filename, buildid, 1963 debuglink_img, crc, &n_dimage ); 1964 } else { 1965 /* See if we can find a matching debug file */ 1966 dimage = find_debug_file( di, di->filename, buildid, NULL, 0, &n_dimage ); 1967 } 1968 1969 ML_(dinfo_free)(buildid); 1970 1971 if (dimage != 0 1972 && n_dimage >= sizeof(ElfXX_Ehdr) 1973 && ML_(is_elf_object_file)((void*)dimage, n_dimage)) { 1974 1975 /* Pull out and validate program header and section header info */ 1976 ElfXX_Ehdr* ehdr_dimg = (ElfXX_Ehdr*)dimage; 1977 ElfXX_Phdr* phdr_dimg = (ElfXX_Phdr*)( ((UChar*)ehdr_dimg) 1978 + ehdr_dimg->e_phoff ); 1979 UWord phdr_dnent = ehdr_dimg->e_phnum; 1980 UWord phdr_dent_szB = ehdr_dimg->e_phentsize; 1981 ElfXX_Shdr* shdr_dimg = (ElfXX_Shdr*)( ((UChar*)ehdr_dimg) 1982 + ehdr_dimg->e_shoff ); 1983 UWord shdr_dnent = ehdr_dimg->e_shnum; 1984 UWord shdr_dent_szB = ehdr_dimg->e_shentsize; 1985 UChar* shdr_strtab_dimg = NULL; 1986 1987 /* SVMAs covered by rx and rw segments and corresponding bias. */ 1988 /* Addr rx_dsvma_base = 0; */ /* UNUSED */ 1989 Addr rx_dsvma_limit = 0; 1990 PtrdiffT rx_dbias = 0; 1991 /* Addr rw_dsvma_base = 0; */ /* UNUSED */ 1992 Addr rw_dsvma_limit = 0; 1993 PtrdiffT rw_dbias = 0; 1994 1995 Bool need_symtab, need_stabs, need_dwarf2, need_dwarf1; 1996 1997 if (phdr_dnent == 0 1998 || !contained_within( 1999 dimage, n_dimage, 2000 (Addr)phdr_dimg, phdr_dnent * phdr_dent_szB)) { 2001 ML_(symerr)(di, True, 2002 "Missing or invalid ELF Program Header Table" 2003 " (debuginfo file)"); 2004 goto out; 2005 } 2006 2007 if (shdr_dnent == 0 2008 || !contained_within( 2009 dimage, n_dimage, 2010 (Addr)shdr_dimg, shdr_dnent * shdr_dent_szB)) { 2011 ML_(symerr)(di, True, 2012 "Missing or invalid ELF Section Header Table" 2013 " (debuginfo file)"); 2014 goto out; 2015 } 2016 2017 /* Also find the section header's string table, and validate. */ 2018 /* checked previously by is_elf_object_file: */ 2019 vg_assert( ehdr_dimg->e_shstrndx != SHN_UNDEF ); 2020 2021 shdr_strtab_dimg 2022 = (UChar*)( ((UChar*)ehdr_dimg) 2023 + shdr_dimg[ehdr_dimg->e_shstrndx].sh_offset); 2024 if (!contained_within( 2025 dimage, n_dimage, 2026 (Addr)shdr_strtab_dimg, 2027 1/*bogus, but we don't know the real size*/ )) { 2028 ML_(symerr)(di, True, 2029 "Invalid ELF Section Header String Table" 2030 " (debuginfo file)"); 2031 goto out; 2032 } 2033 2034 need_symtab = (NULL == symtab_img); 2035 need_stabs = (NULL == stab_img); 2036 need_dwarf2 = (NULL == debug_info_img); 2037 need_dwarf1 = (NULL == dwarf1d_img); 2038 2039 for (i = 0; i < ehdr_dimg->e_phnum; i++) { 2040 ElfXX_Phdr* phdr 2041 = INDEX_BIS( (void*)(dimage + ehdr_dimg->e_phoff), 2042 i, phdr_ent_szB ); 2043 if (phdr->p_type == PT_LOAD) { 2044 if (rx_dsvma_limit == 0 2045 && phdr->p_offset >= di->rx_map_foff 2046 && phdr->p_offset < di->rx_map_foff + di->rx_map_size 2047 && phdr->p_offset + phdr->p_filesz <= di->rx_map_foff + di->rx_map_size) { 2048 /* rx_dsvma_base = phdr->p_vaddr; */ /* UNUSED */ 2049 rx_dsvma_limit = phdr->p_vaddr + phdr->p_memsz; 2050 rx_dbias = di->rx_map_avma - di->rx_map_foff + phdr->p_offset - phdr->p_vaddr; 2051 } 2052 else 2053 if (rw_dsvma_limit == 0 2054 && phdr->p_offset >= di->rw_map_foff 2055 && phdr->p_offset < di->rw_map_foff + di->rw_map_size 2056 && phdr->p_offset + phdr->p_filesz <= di->rw_map_foff + di->rw_map_size) { 2057 /* rw_dsvma_base = phdr->p_vaddr; */ /* UNUSED */ 2058 rw_dsvma_limit = phdr->p_vaddr + phdr->p_memsz; 2059 rw_dbias = di->rw_map_avma - di->rw_map_foff + phdr->p_offset - phdr->p_vaddr; 2060 } 2061 } 2062 } 2063 2064 /* Find all interesting sections */ 2065 for (i = 0; i < ehdr_dimg->e_shnum; i++) { 2066 2067 /* Find debug svma and bias information for sections 2068 we found in the main file. */ 2069 2070# define FIND(sec, seg) \ 2071 do { ElfXX_Shdr* shdr \ 2072 = INDEX_BIS( shdr_dimg, i, shdr_dent_szB ); \ 2073 if (di->sec##_present \ 2074 && 0 == VG_(strcmp)("." #sec, \ 2075 shdr_strtab_dimg + shdr->sh_name)) { \ 2076 vg_assert(di->sec##_size == shdr->sh_size); \ 2077 vg_assert(di->sec##_avma + shdr->sh_addr + seg##_dbias); \ 2078 di->sec##_debug_svma = shdr->sh_addr; \ 2079 di->sec##_debug_bias = seg##_dbias; \ 2080 TRACE_SYMTAB("acquiring ." #sec " debug svma = %#lx .. %#lx\n", \ 2081 di->sec##_debug_svma, \ 2082 di->sec##_debug_svma + di->sec##_size - 1); \ 2083 TRACE_SYMTAB("acquiring ." #sec " debug bias = %#lx\n", \ 2084 di->sec##_debug_bias); \ 2085 } \ 2086 } while (0); 2087 2088 /* SECTION SEGMENT */ 2089 FIND(text, rx) 2090 FIND(data, rw) 2091 FIND(sdata, rw) 2092 FIND(rodata, rw) 2093 FIND(bss, rw) 2094 FIND(sbss, rw) 2095 2096# undef FIND 2097 2098 /* Same deal as previous FIND, except only do it for those 2099 sections for which we didn't find anything useful in 2100 the main file. */ 2101 2102# define FIND(condition, sec_name, sec_size, sec_img) \ 2103 do { ElfXX_Shdr* shdr \ 2104 = INDEX_BIS( shdr_dimg, i, shdr_dent_szB ); \ 2105 if (condition \ 2106 && 0 == VG_(strcmp)(sec_name, \ 2107 shdr_strtab_dimg + shdr->sh_name)) { \ 2108 Bool nobits; \ 2109 if (0 != sec_img) \ 2110 VG_(core_panic)("repeated section!\n"); \ 2111 sec_img = (void*)(dimage + shdr->sh_offset); \ 2112 sec_size = shdr->sh_size; \ 2113 nobits = shdr->sh_type == SHT_NOBITS; \ 2114 TRACE_SYMTAB( "%18s: dimg %p .. %p\n", \ 2115 sec_name, \ 2116 (UChar*)sec_img, \ 2117 ((UChar*)sec_img) + sec_size - 1); \ 2118 /* SHT_NOBITS sections have zero size in the file. */ \ 2119 if ( shdr->sh_offset \ 2120 + (nobits ? 0 : sec_size) > n_dimage ) { \ 2121 ML_(symerr)(di, True, \ 2122 " section beyond image end?!"); \ 2123 goto out; \ 2124 } \ 2125 } \ 2126 } while (0); 2127 2128 /* NEEDED? NAME SIZE IMAGE addr */ 2129 FIND(need_symtab, ".symtab", symtab_sz, symtab_img) 2130 FIND(need_symtab, ".strtab", strtab_sz, strtab_img) 2131 FIND(need_stabs, ".stab", stab_sz, stab_img) 2132 FIND(need_stabs, ".stabstr", stabstr_sz, stabstr_img) 2133 FIND(need_dwarf2, ".debug_line", debug_line_sz, debug_line_img) 2134 FIND(need_dwarf2, ".debug_info", debug_info_sz, debug_info_img) 2135 FIND(need_dwarf2, ".debug_abbrev", debug_abbv_sz, debug_abbv_img) 2136 FIND(need_dwarf2, ".debug_str", debug_str_sz, debug_str_img) 2137 FIND(need_dwarf2, ".debug_ranges", debug_ranges_sz, 2138 debug_ranges_img) 2139 FIND(need_dwarf2, ".debug_loc", debug_loc_sz, debug_loc_img) 2140 FIND(need_dwarf2, ".debug_frame", debug_frame_sz, 2141 debug_frame_img) 2142 FIND(need_dwarf1, ".debug", dwarf1d_sz, dwarf1d_img) 2143 FIND(need_dwarf1, ".line", dwarf1l_sz, dwarf1l_img) 2144 2145# undef FIND 2146 } 2147 } 2148 } 2149 2150 /* Check some sizes */ 2151 vg_assert((dynsym_sz % sizeof(ElfXX_Sym)) == 0); 2152 vg_assert((symtab_sz % sizeof(ElfXX_Sym)) == 0); 2153 2154 /* Read symbols */ 2155 { 2156 void (*read_elf_symtab)(struct _DebugInfo*,UChar*, 2157 ElfXX_Sym*,SizeT, 2158 UChar*,SizeT, 2159 Bool,UChar*); 2160 Bool symtab_in_debug; 2161# if defined(VGP_ppc64_linux) 2162 read_elf_symtab = read_elf_symtab__ppc64_linux; 2163# else 2164 read_elf_symtab = read_elf_symtab__normal; 2165# endif 2166 symtab_in_debug = (Addr)symtab_img >= dimage 2167 && (Addr)symtab_img < dimage + n_dimage; 2168 read_elf_symtab(di, "symbol table", 2169 symtab_img, symtab_sz, 2170 strtab_img, strtab_sz, 2171 symtab_in_debug, opd_img); 2172 2173 read_elf_symtab(di, "dynamic symbol table", 2174 dynsym_img, dynsym_sz, 2175 dynstr_img, dynstr_sz, 2176 False, opd_img); 2177 } 2178 2179 /* Read .eh_frame and .debug_frame (call-frame-info) if any */ 2180 if (ehframe_img) { 2181 vg_assert(ehframe_sz == di->ehframe_size); 2182 ML_(read_callframe_info_dwarf3)( di, ehframe_img, ehframe_sz, True ); 2183 } 2184 if (debug_frame_sz) { 2185 ML_(read_callframe_info_dwarf3)( di, debug_frame_img, 2186 debug_frame_sz, False ); 2187 } 2188 2189 /* Read the stabs and/or dwarf2 debug information, if any. It 2190 appears reading stabs stuff on amd64-linux doesn't work, so 2191 we ignore it. On s390x stabs also doesnt work and we always 2192 have the dwarf info in the eh_frame. */ 2193# if !defined(VGP_amd64_linux) && !defined(VGP_s390x_linux) 2194 if (stab_img && stabstr_img) { 2195 ML_(read_debuginfo_stabs) ( di, stab_img, stab_sz, 2196 stabstr_img, stabstr_sz ); 2197 } 2198# endif 2199 /* jrs 2006-01-01: icc-8.1 has been observed to generate 2200 binaries without debug_str sections. Don't preclude 2201 debuginfo reading for that reason, but, in 2202 read_unitinfo_dwarf2, do check that debugstr is non-NULL 2203 before using it. */ 2204 if (debug_info_img && debug_abbv_img && debug_line_img 2205 /* && debug_str_img */) { 2206 2207 /* The old reader: line numbers and unwind info only */ 2208 ML_(read_debuginfo_dwarf3) ( di, 2209 debug_info_img, debug_info_sz, 2210 debug_abbv_img, debug_abbv_sz, 2211 debug_line_img, debug_line_sz, 2212 debug_str_img, debug_str_sz ); 2213 2214 /* The new reader: read the DIEs in .debug_info to acquire 2215 information on variable types and locations. But only if 2216 the tool asks for it, or the user requests it on the 2217 command line. */ 2218 if (VG_(needs).var_info /* the tool requires it */ 2219 || VG_(clo_read_var_info) /* the user asked for it */) { 2220 ML_(new_dwarf3_reader)( 2221 di, debug_info_img, debug_info_sz, 2222 debug_abbv_img, debug_abbv_sz, 2223 debug_line_img, debug_line_sz, 2224 debug_str_img, debug_str_sz, 2225 debug_ranges_img, debug_ranges_sz, 2226 debug_loc_img, debug_loc_sz 2227 ); 2228 } 2229 } 2230 if (dwarf1d_img && dwarf1l_img) { 2231 ML_(read_debuginfo_dwarf1) ( di, dwarf1d_img, dwarf1d_sz, 2232 dwarf1l_img, dwarf1l_sz ); 2233 } 2234 } 2235 res = True; 2236 2237 out: { 2238 SysRes m_res; 2239 2240 /* Last, but not least, heave the image(s) back overboard. */ 2241 if (dimage) { 2242 m_res = VG_(am_munmap_valgrind) ( dimage, n_dimage ); 2243 vg_assert(!sr_isError(m_res)); 2244 } 2245 m_res = VG_(am_munmap_valgrind) ( oimage, n_oimage ); 2246 vg_assert(!sr_isError(m_res)); 2247 return res; 2248 } 2249} 2250 2251#endif // defined(VGO_linux) 2252 2253/*--------------------------------------------------------------------*/ 2254/*--- end ---*/ 2255/*--------------------------------------------------------------------*/ 2256