2 * File elf.c - processing of ELF files
4 * Copyright (C) 1996, Eric Youngdale.
5 * 1999-2007 Eric Pouech
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #include "wine/port.h"
25 #if defined(__svr4__) || defined(__sun)
27 /* large files are not supported by libelf */
28 #undef _FILE_OFFSET_BITS
29 #define _FILE_OFFSET_BITS 32
35 #ifdef HAVE_SYS_STAT_H
36 # include <sys/stat.h>
39 #ifdef HAVE_SYS_MMAN_H
46 #define PATH_MAX MAX_PATH
49 #include "dbghelp_private.h"
54 #ifdef HAVE_SYS_ELF32_H
55 # include <sys/elf32.h>
57 #ifdef HAVE_SYS_EXEC_ELF_H
58 # include <sys/exec_elf.h>
61 # if defined(DT_COUNT)
62 # define DT_NUM DT_COUNT
64 /* this seems to be a satisfactory value on Solaris, which doesn't support this AFAICT */
71 #ifdef HAVE_SYS_LINK_H
72 # include <sys/link.h>
75 #include "wine/library.h"
76 #include "wine/debug.h"
78 struct elf_module_info
80 unsigned long elf_addr;
81 unsigned short elf_mark : 1,
87 #define ELF_INFO_DEBUG_HEADER 0x0001
88 #define ELF_INFO_MODULE 0x0002
89 #define ELF_INFO_NAME 0x0004
91 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
95 unsigned flags; /* IN one (or several) of the ELF_INFO constants */
96 unsigned long dbg_hdr_addr; /* OUT address of debug header (if ELF_INFO_DEBUG_HEADER is set) */
97 struct module* module; /* OUT loaded module (if ELF_INFO_MODULE is set) */
98 const WCHAR* module_name; /* OUT found module name (if ELF_INFO_NAME is set) */
101 /* structure holding information while handling an ELF image
102 * allows one by one section mapping for memory savings
115 const char* shstrtab;
116 struct elf_file_map* alternate; /* another ELF file (linked to this one) */
119 struct elf_section_map
121 struct elf_file_map* fmap;
127 struct hash_table_elt ht_elt;
128 const Elf32_Sym* symp;
129 struct symt_compiland* compiland;
133 struct elf_thunk_area
136 THUNK_ORDINAL ordinal;
137 unsigned long rva_start;
138 unsigned long rva_end;
141 /******************************************************************
144 * Maps a single section into memory from an ELF file
146 static const char* elf_map_section(struct elf_section_map* esm)
148 unsigned pgsz = getpagesize();
151 if (esm->sidx < 0 || esm->sidx >= esm->fmap->elfhdr.e_shnum ||
152 esm->fmap->sect[esm->sidx].shdr.sh_type == SHT_NOBITS)
155 /* align required information on page size (we assume pagesize is a power of 2) */
156 ofst = esm->fmap->sect[esm->sidx].shdr.sh_offset & ~(pgsz - 1);
157 size = ((esm->fmap->sect[esm->sidx].shdr.sh_offset +
158 esm->fmap->sect[esm->sidx].shdr.sh_size + pgsz - 1) & ~(pgsz - 1)) - ofst;
159 esm->fmap->sect[esm->sidx].mapped = mmap(NULL, size, PROT_READ, MAP_PRIVATE,
160 esm->fmap->fd, ofst);
161 if (esm->fmap->sect[esm->sidx].mapped == ELF_NO_MAP) return ELF_NO_MAP;
162 return esm->fmap->sect[esm->sidx].mapped + (esm->fmap->sect[esm->sidx].shdr.sh_offset & (pgsz - 1));
165 /******************************************************************
168 * Finds a section by name (and type) into memory from an ELF file
169 * or its alternate if any
171 static BOOL elf_find_section(struct elf_file_map* fmap, const char* name,
172 unsigned sht, struct elf_section_map* esm)
178 if (fmap->shstrtab == ELF_NO_MAP)
180 struct elf_section_map hdr_esm = {fmap, fmap->elfhdr.e_shstrndx};
181 if ((fmap->shstrtab = elf_map_section(&hdr_esm)) == ELF_NO_MAP) break;
183 for (i = 0; i < fmap->elfhdr.e_shnum; i++)
185 if (strcmp(fmap->shstrtab + fmap->sect[i].shdr.sh_name, name) == 0 &&
186 (sht == SHT_NULL || sht == fmap->sect[i].shdr.sh_type))
193 fmap = fmap->alternate;
200 /******************************************************************
203 * Unmaps a single section from memory
205 static void elf_unmap_section(struct elf_section_map* esm)
207 if (esm->sidx >= 0 && esm->sidx < esm->fmap->elfhdr.e_shnum && esm->fmap->sect[esm->sidx].mapped != ELF_NO_MAP)
209 unsigned pgsz = getpagesize();
212 ofst = esm->fmap->sect[esm->sidx].shdr.sh_offset & ~(pgsz - 1);
213 size = ((esm->fmap->sect[esm->sidx].shdr.sh_offset +
214 esm->fmap->sect[esm->sidx].shdr.sh_size + pgsz - 1) & ~(pgsz - 1)) - ofst;
215 if (munmap((char*)esm->fmap->sect[esm->sidx].mapped, size) < 0)
216 WARN("Couldn't unmap the section\n");
217 esm->fmap->sect[esm->sidx].mapped = ELF_NO_MAP;
221 static void elf_end_find(struct elf_file_map* fmap)
223 struct elf_section_map esm;
228 esm.sidx = fmap->elfhdr.e_shstrndx;
229 elf_unmap_section(&esm);
230 fmap->shstrtab = ELF_NO_MAP;
231 fmap = fmap->alternate;
235 /******************************************************************
238 * Get the size of an ELF section
240 static inline unsigned elf_get_map_size(struct elf_section_map* esm)
242 if (esm->sidx < 0 || esm->sidx >= esm->fmap->elfhdr.e_shnum)
244 return esm->fmap->sect[esm->sidx].shdr.sh_size;
247 /******************************************************************
250 * Maps an ELF file into memory (and checks it's a real ELF file)
252 static BOOL elf_map_file(const WCHAR* filenameW, struct elf_file_map* fmap)
254 static const BYTE elf_signature[4] = { ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3 };
258 unsigned tmp, page_mask = getpagesize() - 1;
263 len = WideCharToMultiByte(CP_UNIXCP, 0, filenameW, -1, NULL, 0, NULL, NULL);
264 if (!(filename = HeapAlloc(GetProcessHeap(), 0, len))) return FALSE;
265 WideCharToMultiByte(CP_UNIXCP, 0, filenameW, -1, filename, len, NULL, NULL);
268 fmap->shstrtab = ELF_NO_MAP;
269 fmap->alternate = NULL;
271 /* check that the file exists, and that the module hasn't been loaded yet */
272 if (stat(filename, &statbuf) == -1 || S_ISDIR(statbuf.st_mode)) goto done;
274 /* Now open the file, so that we can mmap() it. */
275 if ((fmap->fd = open(filename, O_RDONLY)) == -1) goto done;
277 if (read(fmap->fd, &fmap->elfhdr, sizeof(fmap->elfhdr)) != sizeof(fmap->elfhdr))
279 /* and check for an ELF header */
280 if (memcmp(fmap->elfhdr.e_ident,
281 elf_signature, sizeof(elf_signature))) goto done;
283 fmap->sect = HeapAlloc(GetProcessHeap(), 0,
284 fmap->elfhdr.e_shnum * sizeof(fmap->sect[0]));
285 if (!fmap->sect) goto done;
287 lseek(fmap->fd, fmap->elfhdr.e_shoff, SEEK_SET);
288 for (i = 0; i < fmap->elfhdr.e_shnum; i++)
290 read(fmap->fd, &fmap->sect[i].shdr, sizeof(fmap->sect[i].shdr));
291 fmap->sect[i].mapped = ELF_NO_MAP;
294 /* grab size of module once loaded in memory */
295 lseek(fmap->fd, fmap->elfhdr.e_phoff, SEEK_SET);
297 fmap->elf_start = ~0L;
298 for (i = 0; i < fmap->elfhdr.e_phnum; i++)
300 if (read(fmap->fd, &phdr, sizeof(phdr)) == sizeof(phdr) &&
301 phdr.p_type == PT_LOAD)
303 tmp = (phdr.p_vaddr + phdr.p_memsz + page_mask) & ~page_mask;
304 if (fmap->elf_size < tmp) fmap->elf_size = tmp;
305 if (phdr.p_vaddr < fmap->elf_start) fmap->elf_start = phdr.p_vaddr;
308 /* if non relocatable ELF, then remove fixed address from computation
309 * otherwise, all addresses are zero based and start has no effect
311 fmap->elf_size -= fmap->elf_start;
314 HeapFree(GetProcessHeap(), 0, filename);
318 /******************************************************************
321 * Unmaps an ELF file from memory (previously mapped with elf_map_file)
323 static void elf_unmap_file(struct elf_file_map* fmap)
329 struct elf_section_map esm;
331 for (esm.sidx = 0; esm.sidx < fmap->elfhdr.e_shnum; esm.sidx++)
333 elf_unmap_section(&esm);
335 HeapFree(GetProcessHeap(), 0, fmap->sect);
338 fmap = fmap->alternate;
342 /******************************************************************
343 * elf_is_in_thunk_area
345 * Check whether an address lies within one of the thunk area we
348 int elf_is_in_thunk_area(unsigned long addr,
349 const struct elf_thunk_area* thunks)
353 for (i = 0; thunks[i].symname; i++)
355 if (addr >= thunks[i].rva_start && addr < thunks[i].rva_end)
361 /******************************************************************
364 * creating an internal hash table to ease use ELF symtab information lookup
366 static void elf_hash_symtab(struct module* module, struct pool* pool,
367 struct hash_table* ht_symtab, struct elf_file_map* fmap,
368 struct elf_thunk_area* thunks)
373 struct symt_compiland* compiland = NULL;
375 const Elf32_Sym* symp;
376 struct symtab_elt* ste;
377 struct elf_section_map esm, esm_str;
379 if (!elf_find_section(fmap, ".symtab", SHT_SYMTAB, &esm) &&
380 !elf_find_section(fmap, ".dynsym", SHT_DYNSYM, &esm)) return;
381 if ((symp = (const Elf32_Sym*)elf_map_section(&esm)) == ELF_NO_MAP) return;
383 esm_str.sidx = fmap->sect[esm.sidx].shdr.sh_link;
384 if ((strp = elf_map_section(&esm_str)) == ELF_NO_MAP) return;
386 nsym = elf_get_map_size(&esm) / sizeof(*symp);
388 for (j = 0; thunks[j].symname; j++)
389 thunks[j].rva_start = thunks[j].rva_end = 0;
391 for (i = 0; i < nsym; i++, symp++)
393 /* Ignore certain types of entries which really aren't of that much
396 if ((ELF32_ST_TYPE(symp->st_info) != STT_NOTYPE &&
397 ELF32_ST_TYPE(symp->st_info) != STT_FILE &&
398 ELF32_ST_TYPE(symp->st_info) != STT_OBJECT &&
399 ELF32_ST_TYPE(symp->st_info) != STT_FUNC) ||
400 symp->st_shndx == SHN_UNDEF)
405 symname = strp + symp->st_name;
407 /* handle some specific symtab (that we'll throw away when done) */
408 switch (ELF32_ST_TYPE(symp->st_info))
412 compiland = symt_new_compiland(module, symp->st_value,
413 source_new(module, NULL, symname));
418 /* we are only interested in wine markers inserted by winebuild */
419 for (j = 0; thunks[j].symname; j++)
421 if (!strcmp(symname, thunks[j].symname))
423 thunks[j].rva_start = symp->st_value;
424 thunks[j].rva_end = symp->st_value + symp->st_size;
431 /* FIXME: we don't need to handle them (GCC internals)
432 * Moreover, they screw up our symbol lookup :-/
434 if (symname[0] == '.' && symname[1] == 'L' && isdigit(symname[2]))
437 ste = pool_alloc(pool, sizeof(*ste));
438 ste->ht_elt.name = symname;
439 /* GCC emits, in some cases, a .<digit>+ suffix.
440 * This is used for static variable inside functions, so
441 * that we can have several such variables with same name in
442 * the same compilation unit
443 * We simply ignore that suffix when present (we also get rid
444 * of it in stabs parsing)
446 ptr = symname + strlen(symname) - 1;
449 while (isdigit(*ptr) && ptr >= symname) ptr--;
450 if (ptr > symname && *ptr == '.')
452 char* n = pool_alloc(pool, ptr - symname + 1);
453 memcpy(n, symname, ptr - symname + 1);
454 n[ptr - symname] = '\0';
455 ste->ht_elt.name = n;
459 ste->compiland = compiland;
461 hash_table_add(ht_symtab, &ste->ht_elt);
463 /* as we added in the ht_symtab pointers to the symbols themselves,
464 * we cannot unmap yet the sections, it will be done when we're over
469 /******************************************************************
472 * lookup a symbol by name in our internal hash table for the symtab
474 static const Elf32_Sym* elf_lookup_symtab(const struct module* module,
475 const struct hash_table* ht_symtab,
476 const char* name, struct symt* compiland)
478 struct symtab_elt* weak_result = NULL; /* without compiland name */
479 struct symtab_elt* result = NULL;
480 struct hash_table_iter hti;
481 struct symtab_elt* ste;
482 const char* compiland_name;
483 const char* compiland_basename;
486 /* we need weak match up (at least) when symbols of same name,
487 * defined several times in different compilation units,
488 * are merged in a single one (hence a different filename for c.u.)
492 compiland_name = source_get(module,
493 ((struct symt_compiland*)compiland)->source);
494 compiland_basename = strrchr(compiland_name, '/');
495 if (!compiland_basename++) compiland_basename = compiland_name;
497 else compiland_name = compiland_basename = NULL;
499 hash_table_iter_init(ht_symtab, &hti, name);
500 while ((ste = hash_table_iter_up(&hti)))
502 if (ste->used || strcmp(ste->ht_elt.name, name)) continue;
505 if ((ste->compiland && !compiland_name) || (!ste->compiland && compiland_name))
507 if (ste->compiland && compiland_name)
509 const char* filename = source_get(module, ste->compiland->source);
510 if (strcmp(filename, compiland_name))
512 base = strrchr(filename, '/');
513 if (!base++) base = filename;
514 if (strcmp(base, compiland_basename)) continue;
519 FIXME("Already found symbol %s (%s) in symtab %s @%08x and %s @%08x\n",
520 name, compiland_name,
521 source_get(module, result->compiland->source), (unsigned int)result->symp->st_value,
522 source_get(module, ste->compiland->source), (unsigned int)ste->symp->st_value);
530 if (!result && !(result = weak_result))
532 FIXME("Couldn't find symbol %s!%s in symtab\n",
533 debugstr_w(module->module.ModuleName), name);
539 /******************************************************************
540 * elf_finish_stabs_info
542 * - get any relevant information (address & size) from the bits we got from the
543 * stabs debugging information
545 static void elf_finish_stabs_info(struct module* module, struct hash_table* symtab)
547 struct hash_table_iter hti;
550 const Elf32_Sym* symp;
552 hash_table_iter_init(&module->ht_symbols, &hti, NULL);
553 while ((ptr = hash_table_iter_up(&hti)))
555 sym = GET_ENTRY(ptr, struct symt_ht, hash_elt);
556 switch (sym->symt.tag)
559 if (((struct symt_function*)sym)->address != module->elf_info->elf_addr &&
560 ((struct symt_function*)sym)->size)
564 symp = elf_lookup_symtab(module, symtab, sym->hash_elt.name,
565 ((struct symt_function*)sym)->container);
568 if (((struct symt_function*)sym)->address != module->elf_info->elf_addr &&
569 ((struct symt_function*)sym)->address != module->elf_info->elf_addr + symp->st_value)
570 FIXME("Changing address for %p/%s!%s from %08lx to %08lx\n",
571 sym, debugstr_w(module->module.ModuleName), sym->hash_elt.name,
572 ((struct symt_function*)sym)->address, module->elf_info->elf_addr + symp->st_value);
573 if (((struct symt_function*)sym)->size && ((struct symt_function*)sym)->size != symp->st_size)
574 FIXME("Changing size for %p/%s!%s from %08lx to %08x\n",
575 sym, debugstr_w(module->module.ModuleName), sym->hash_elt.name,
576 ((struct symt_function*)sym)->size, (unsigned int)symp->st_size);
578 ((struct symt_function*)sym)->address = module->elf_info->elf_addr +
580 ((struct symt_function*)sym)->size = symp->st_size;
582 FIXME("Couldn't find %s!%s\n",
583 debugstr_w(module->module.ModuleName), sym->hash_elt.name);
586 switch (((struct symt_data*)sym)->kind)
589 case DataIsFileStatic:
590 if (((struct symt_data*)sym)->u.var.offset != module->elf_info->elf_addr)
592 symp = elf_lookup_symtab(module, symtab, sym->hash_elt.name,
593 ((struct symt_data*)sym)->container);
596 if (((struct symt_data*)sym)->u.var.offset != module->elf_info->elf_addr &&
597 ((struct symt_data*)sym)->u.var.offset != module->elf_info->elf_addr + symp->st_value)
598 FIXME("Changing address for %p/%s!%s from %08lx to %08lx\n",
599 sym, debugstr_w(module->module.ModuleName), sym->hash_elt.name,
600 ((struct symt_function*)sym)->address, module->elf_info->elf_addr + symp->st_value);
601 ((struct symt_data*)sym)->u.var.offset = module->elf_info->elf_addr +
603 ((struct symt_data*)sym)->kind = (ELF32_ST_BIND(symp->st_info) == STB_LOCAL) ?
604 DataIsFileStatic : DataIsGlobal;
606 FIXME("Couldn't find %s!%s\n",
607 debugstr_w(module->module.ModuleName), sym->hash_elt.name);
613 FIXME("Unsupported tag %u\n", sym->symt.tag);
617 /* since we may have changed some addresses & sizes, mark the module to be resorted */
618 module->sortlist_valid = FALSE;
621 /******************************************************************
622 * elf_load_wine_thunks
624 * creating the thunk objects for a wine native DLL
626 static int elf_new_wine_thunks(struct module* module, struct hash_table* ht_symtab,
627 const struct elf_thunk_area* thunks)
630 struct hash_table_iter hti;
631 struct symtab_elt* ste;
633 struct symt_ht* symt;
635 hash_table_iter_init(ht_symtab, &hti, NULL);
636 while ((ste = hash_table_iter_up(&hti)))
638 if (ste->used) continue;
640 addr = module->elf_info->elf_addr + ste->symp->st_value;
642 j = elf_is_in_thunk_area(ste->symp->st_value, thunks);
643 if (j >= 0) /* thunk found */
645 symt_new_thunk(module, ste->compiland, ste->ht_elt.name, thunks[j].ordinal,
646 addr, ste->symp->st_size);
652 symt = symt_find_nearest(module, addr);
653 if (symt && !symt_get_info(&symt->symt, TI_GET_ADDRESS, &ref_addr))
655 if (!symt || addr != ref_addr)
657 /* creating public symbols for all the ELF symbols which haven't been
658 * used yet (ie we have no debug information on them)
659 * That's the case, for example, of the .spec.c files
661 switch (ELF32_ST_TYPE(ste->symp->st_info))
664 symt_new_function(module, ste->compiland, ste->ht_elt.name,
665 addr, ste->symp->st_size, NULL);
668 symt_new_global_variable(module, ste->compiland, ste->ht_elt.name,
669 ELF32_ST_BIND(ste->symp->st_info) == STB_LOCAL,
670 addr, ste->symp->st_size, NULL);
673 FIXME("Shouldn't happen\n");
676 /* FIXME: this is a hack !!!
677 * we are adding new symbols, but as we're parsing a symbol table
678 * (hopefully without duplicate symbols) we delay rebuilding the sorted
679 * module table until we're done with the symbol table
680 * Otherwise, as we intertwine symbols's add and lookup, performance
683 module->sortlist_valid = TRUE;
685 else if (strcmp(ste->ht_elt.name, symt->hash_elt.name))
687 ULONG64 xaddr = 0, xsize = 0;
690 symt_get_info(&symt->symt, TI_GET_ADDRESS, &xaddr);
691 symt_get_info(&symt->symt, TI_GET_LENGTH, &xsize);
692 symt_get_info(&symt->symt, TI_GET_DATAKIND, &kind);
694 /* If none of symbols has a correct size, we consider they are both markers
695 * Hence, we can silence this warning
696 * Also, we check that we don't have two symbols, one local, the other
697 * global which is legal
699 if ((xsize || ste->symp->st_size) &&
700 (kind == (ELF32_ST_BIND(ste->symp->st_info) == STB_LOCAL) ? DataIsFileStatic : DataIsGlobal))
701 FIXME("Duplicate in %s: %s<%08x-%08x> %s<%s-%s>\n",
702 debugstr_w(module->module.ModuleName),
703 ste->ht_elt.name, addr, (unsigned int)ste->symp->st_size,
705 wine_dbgstr_longlong(xaddr), wine_dbgstr_longlong(xsize));
709 /* see comment above */
710 module->sortlist_valid = FALSE;
714 /******************************************************************
715 * elf_new_public_symbols
717 * Creates a set of public symbols from an ELF symtab
719 static int elf_new_public_symbols(struct module* module, struct hash_table* symtab)
721 struct hash_table_iter hti;
722 struct symtab_elt* ste;
724 if (dbghelp_options & SYMOPT_NO_PUBLICS) return TRUE;
726 /* FIXME: we're missing the ELF entry point here */
728 hash_table_iter_init(symtab, &hti, NULL);
729 while ((ste = hash_table_iter_up(&hti)))
731 symt_new_public(module, ste->compiland, ste->ht_elt.name,
732 module->elf_info->elf_addr + ste->symp->st_value,
733 ste->symp->st_size, TRUE /* FIXME */,
734 ELF32_ST_TYPE(ste->symp->st_info) == STT_FUNC);
739 static BOOL elf_check_debug_link(const WCHAR* file, struct elf_file_map* fmap, DWORD crc)
742 if (!elf_map_file(file, fmap)) return FALSE;
743 if (!(ret = crc == calc_crc32(fmap->fd)))
745 WARN("Bad CRC for file %s (got %08x while expecting %08x)\n",
746 debugstr_w(file), calc_crc32(fmap->fd), crc);
747 elf_unmap_file(fmap);
752 /******************************************************************
753 * elf_locate_debug_link
755 * Locate a filename from a .gnu_debuglink section, using the same
757 * "If the full name of the directory containing the executable is
758 * execdir, and the executable has a debug link that specifies the
759 * name debugfile, then GDB will automatically search for the
760 * debugging information file in three places:
761 * - the directory containing the executable file (that is, it
762 * will look for a file named `execdir/debugfile',
763 * - a subdirectory of that directory named `.debug' (that is, the
764 * file `execdir/.debug/debugfile', and
765 * - a subdirectory of the global debug file directory that includes
766 * the executable's full path, and the name from the link (that is,
767 * the file `globaldebugdir/execdir/debugfile', where globaldebugdir
768 * is the global debug file directory, and execdir has been turned
769 * into a relative path)." (from GDB manual)
771 static BOOL elf_locate_debug_link(struct elf_file_map* fmap, const char* filename,
772 const WCHAR* loaded_file, DWORD crc)
774 static const WCHAR globalDebugDirW[] = {'/','u','s','r','/','l','i','b','/','d','e','b','u','g','/'};
775 static const WCHAR dotDebugW[] = {'.','d','e','b','u','g','/'};
776 const size_t globalDebugDirLen = sizeof(globalDebugDirW) / sizeof(WCHAR);
780 struct elf_file_map* fmap_link = NULL;
782 fmap_link = HeapAlloc(GetProcessHeap(), 0, sizeof(*fmap_link));
783 if (!fmap_link) return FALSE;
785 filename_len = MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, NULL, 0);
786 p = HeapAlloc(GetProcessHeap(), 0,
787 (globalDebugDirLen + strlenW(loaded_file) + 6 + 1 + filename_len + 1) * sizeof(WCHAR));
790 /* we prebuild the string with "execdir" */
791 strcpyW(p, loaded_file);
792 slash = strrchrW(p, '/');
793 if (slash == NULL) slash = p; else slash++;
795 /* testing execdir/filename */
796 MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash, filename_len);
797 if (elf_check_debug_link(p, fmap_link, crc)) goto found;
799 /* testing execdir/.debug/filename */
800 memcpy(slash, dotDebugW, sizeof(dotDebugW));
801 MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash + sizeof(dotDebugW) / sizeof(WCHAR), filename_len);
802 if (elf_check_debug_link(p, fmap_link, crc)) goto found;
804 /* testing globaldebugdir/execdir/filename */
805 memmove(p + globalDebugDirLen, p, (slash - p) * sizeof(WCHAR));
806 memcpy(p, globalDebugDirW, globalDebugDirLen * sizeof(WCHAR));
807 slash += globalDebugDirLen;
808 MultiByteToWideChar(CP_UNIXCP, 0, filename, -1, slash, filename_len);
809 if (elf_check_debug_link(p, fmap_link, crc)) goto found;
811 /* finally testing filename */
812 if (elf_check_debug_link(slash, fmap_link, crc)) goto found;
815 WARN("Couldn't locate or map %s\n", filename);
816 HeapFree(GetProcessHeap(), 0, p);
817 HeapFree(GetProcessHeap(), 0, fmap_link);
821 TRACE("Located debug information file %s at %s\n", filename, debugstr_w(p));
822 HeapFree(GetProcessHeap(), 0, p);
823 fmap->alternate = fmap_link;
827 /******************************************************************
828 * elf_debuglink_parse
830 * Parses a .gnu_debuglink section and loads the debug info from
831 * the external file specified there.
833 static BOOL elf_debuglink_parse(struct elf_file_map* fmap, struct module* module,
834 const BYTE* debuglink)
836 /* The content of a debug link section is:
837 * 1/ a NULL terminated string, containing the file name for the
839 * 2/ padding on 4 byte boundary
840 * 3/ CRC of the linked ELF file
842 const char* dbg_link = (const char*)debuglink;
845 crc = *(const DWORD*)(dbg_link + ((DWORD_PTR)(strlen(dbg_link) + 4) & ~3));
846 return elf_locate_debug_link(fmap, dbg_link, module->module.LoadedImageName, crc);
849 /******************************************************************
850 * elf_load_debug_info_from_map
852 * Loads the symbolic information from ELF module which mapping is described
854 * the module has been loaded at 'load_offset' address, so symbols' address
855 * relocation is performed.
856 * CRC is checked if fmap->with_crc is TRUE
858 * 0 if the file doesn't contain symbolic info (or this info cannot be
862 static BOOL elf_load_debug_info_from_map(struct module* module,
863 struct elf_file_map* fmap,
865 struct hash_table* ht_symtab)
867 BOOL ret = FALSE, lret;
868 struct elf_thunk_area thunks[] =
870 {"__wine_spec_import_thunks", THUNK_ORDINAL_NOTYPE, 0, 0}, /* inter DLL calls */
871 {"__wine_spec_delayed_import_loaders", THUNK_ORDINAL_LOAD, 0, 0}, /* delayed inter DLL calls */
872 {"__wine_spec_delayed_import_thunks", THUNK_ORDINAL_LOAD, 0, 0}, /* delayed inter DLL calls */
873 {"__wine_delay_load", THUNK_ORDINAL_LOAD, 0, 0}, /* delayed inter DLL calls */
874 {"__wine_spec_thunk_text_16", -16, 0, 0}, /* 16 => 32 thunks */
875 {"__wine_spec_thunk_text_32", -32, 0, 0}, /* 32 => 16 thunks */
879 module->module.SymType = SymExport;
881 /* create a hash table for the symtab */
882 elf_hash_symtab(module, pool, ht_symtab, fmap, thunks);
884 if (!(dbghelp_options & SYMOPT_PUBLICS_ONLY))
886 struct elf_section_map stab_sect, stabstr_sect;
887 struct elf_section_map debug_sect, debug_str_sect, debug_abbrev_sect,
888 debug_line_sect, debug_loclist_sect;
889 struct elf_section_map debuglink_sect;
891 /* if present, add the .gnu_debuglink file as an alternate to current one */
892 if (elf_find_section(fmap, ".gnu_debuglink", SHT_NULL, &debuglink_sect))
894 const BYTE* dbg_link;
896 dbg_link = (const BYTE*)elf_map_section(&debuglink_sect);
897 if (dbg_link != ELF_NO_MAP)
899 lret = elf_debuglink_parse(fmap, module, dbg_link);
901 WARN("Couldn't load linked debug file for %s\n",
902 debugstr_w(module->module.ModuleName));
905 elf_unmap_section(&debuglink_sect);
907 if (elf_find_section(fmap, ".stab", SHT_NULL, &stab_sect) &&
908 elf_find_section(fmap, ".stabstr", SHT_NULL, &stabstr_sect))
913 stab = elf_map_section(&stab_sect);
914 stabstr = elf_map_section(&stabstr_sect);
915 if (stab != ELF_NO_MAP && stabstr != ELF_NO_MAP)
917 /* OK, now just parse all of the stabs. */
918 lret = stabs_parse(module, module->elf_info->elf_addr,
919 stab, elf_get_map_size(&stab_sect),
920 stabstr, elf_get_map_size(&stabstr_sect),
923 /* and fill in the missing information for stabs */
924 elf_finish_stabs_info(module, ht_symtab);
926 WARN("Couldn't correctly read stabs\n");
930 elf_unmap_section(&stab_sect);
931 elf_unmap_section(&stabstr_sect);
933 if (elf_find_section(fmap, ".debug_info", SHT_NULL, &debug_sect))
935 /* Dwarf 2 debug information */
936 const BYTE* dw2_debug;
937 const BYTE* dw2_debug_abbrev;
938 const BYTE* dw2_debug_str;
939 const BYTE* dw2_debug_line;
940 const BYTE* dw2_debug_loclist;
942 /* debug info might have a different base address than .so file
943 * when elf file is prelinked after splitting off debug info
944 * adjust symbol base addresses accordingly
946 unsigned long load_offset = module->elf_info->elf_addr +
947 fmap->elf_start - debug_sect.fmap->elf_start;
949 TRACE("Loading Dwarf2 information for %s\n", debugstr_w(module->module.ModuleName));
951 elf_find_section(fmap, ".debug_str", SHT_NULL, &debug_str_sect);
952 elf_find_section(fmap, ".debug_abbrev", SHT_NULL, &debug_abbrev_sect);
953 elf_find_section(fmap, ".debug_line", SHT_NULL, &debug_line_sect);
954 elf_find_section(fmap, ".debug_loc", SHT_NULL, &debug_loclist_sect);
956 dw2_debug = (const BYTE*)elf_map_section(&debug_sect);
957 dw2_debug_abbrev = (const BYTE*)elf_map_section(&debug_abbrev_sect);
958 dw2_debug_str = (const BYTE*)elf_map_section(&debug_str_sect);
959 dw2_debug_line = (const BYTE*)elf_map_section(&debug_line_sect);
960 dw2_debug_loclist = (const BYTE*)elf_map_section(&debug_loclist_sect);
961 if (dw2_debug != ELF_NO_MAP && dw2_debug_abbrev != ELF_NO_MAP && dw2_debug_str != ELF_NO_MAP)
963 /* OK, now just parse dwarf2 debug infos. */
964 lret = dwarf2_parse(module, load_offset, thunks,
965 dw2_debug, elf_get_map_size(&debug_sect),
966 dw2_debug_abbrev, elf_get_map_size(&debug_abbrev_sect),
967 dw2_debug_str, elf_get_map_size(&debug_str_sect),
968 dw2_debug_line, elf_get_map_size(&debug_line_sect),
969 dw2_debug_loclist, elf_get_map_size(&debug_loclist_sect));
972 WARN("Couldn't correctly read dwarf2\n");
975 elf_unmap_section(&debug_sect);
976 elf_unmap_section(&debug_abbrev_sect);
977 elf_unmap_section(&debug_str_sect);
978 elf_unmap_section(&debug_line_sect);
979 elf_unmap_section(&debug_loclist_sect);
982 if (strstrW(module->module.ModuleName, S_ElfW) ||
983 !strcmpW(module->module.ModuleName, S_WineLoaderW))
985 /* add the thunks for native libraries */
986 if (!(dbghelp_options & SYMOPT_PUBLICS_ONLY))
987 elf_new_wine_thunks(module, ht_symtab, thunks);
989 /* add all the public symbols from symtab */
990 if (elf_new_public_symbols(module, ht_symtab) && !ret) ret = TRUE;
995 /******************************************************************
996 * elf_load_debug_info
998 * Loads ELF debugging information from the module image file.
1000 BOOL elf_load_debug_info(struct module* module, struct elf_file_map* fmap)
1004 struct hash_table ht_symtab;
1005 struct elf_file_map my_fmap;
1007 if (module->type != DMT_ELF || !module->elf_info)
1009 ERR("Bad elf module '%s'\n", debugstr_w(module->module.LoadedImageName));
1013 pool_init(&pool, 65536);
1014 hash_table_init(&pool, &ht_symtab, 256);
1019 ret = elf_map_file(module->module.LoadedImageName, fmap);
1022 ret = elf_load_debug_info_from_map(module, fmap, &pool, &ht_symtab);
1024 pool_destroy(&pool);
1025 if (fmap == &my_fmap) elf_unmap_file(fmap);
1029 /******************************************************************
1030 * elf_fetch_file_info
1032 * Gathers some more information for an ELF module from a given file
1034 BOOL elf_fetch_file_info(const WCHAR* name, DWORD* base,
1035 DWORD* size, DWORD* checksum)
1037 struct elf_file_map fmap;
1039 if (!elf_map_file(name, &fmap)) return FALSE;
1040 if (base) *base = fmap.elf_start;
1041 *size = fmap.elf_size;
1042 *checksum = calc_crc32(fmap.fd);
1043 elf_unmap_file(&fmap);
1047 /******************************************************************
1050 * Loads the information for ELF module stored in 'filename'
1051 * the module has been loaded at 'load_offset' address
1053 * -1 if the file cannot be found/opened
1054 * 0 if the file doesn't contain symbolic info (or this info cannot be
1058 static BOOL elf_load_file(struct process* pcs, const WCHAR* filename,
1059 unsigned long load_offset, struct elf_info* elf_info)
1062 struct elf_file_map fmap;
1064 TRACE("Processing elf file '%s' at %08lx\n", debugstr_w(filename), load_offset);
1066 if (!elf_map_file(filename, &fmap)) goto leave;
1068 /* Next, we need to find a few of the internal ELF headers within
1069 * this thing. We need the main executable header, and the section
1072 if (!fmap.elf_start && !load_offset)
1073 ERR("Relocatable ELF %s, but no load address. Loading at 0x0000000\n",
1074 debugstr_w(filename));
1075 if (fmap.elf_start && load_offset)
1077 WARN("Non-relocatable ELF %s, but load address of 0x%08lx supplied. "
1078 "Assuming load address is corrupt\n", debugstr_w(filename), load_offset);
1082 if (elf_info->flags & ELF_INFO_DEBUG_HEADER)
1084 struct elf_section_map esm;
1086 if (elf_find_section(&fmap, ".dynamic", SHT_DYNAMIC, &esm))
1089 char* ptr = (char*)fmap.sect[esm.sidx].shdr.sh_addr;
1094 if (!ReadProcessMemory(pcs->handle, ptr, &dyn, sizeof(dyn), &len) ||
1097 if (dyn.d_tag == DT_DEBUG)
1099 elf_info->dbg_hdr_addr = dyn.d_un.d_ptr;
1103 } while (dyn.d_tag != DT_NULL);
1104 if (dyn.d_tag == DT_NULL) goto leave;
1106 elf_end_find(&fmap);
1109 if (elf_info->flags & ELF_INFO_MODULE)
1111 struct elf_module_info *elf_module_info =
1112 HeapAlloc(GetProcessHeap(), 0, sizeof(struct elf_module_info));
1113 if (!elf_module_info) goto leave;
1114 elf_info->module = module_new(pcs, filename, DMT_ELF, FALSE,
1115 (load_offset) ? load_offset : fmap.elf_start,
1116 fmap.elf_size, 0, calc_crc32(fmap.fd));
1117 if (!elf_info->module)
1119 HeapFree(GetProcessHeap(), 0, elf_module_info);
1122 elf_info->module->elf_info = elf_module_info;
1123 elf_info->module->elf_info->elf_addr = load_offset;
1125 if (dbghelp_options & SYMOPT_DEFERRED_LOADS)
1127 elf_info->module->module.SymType = SymDeferred;
1130 else ret = elf_load_debug_info(elf_info->module, &fmap);
1132 elf_info->module->elf_info->elf_mark = 1;
1133 elf_info->module->elf_info->elf_loader = 0;
1136 if (elf_info->flags & ELF_INFO_NAME)
1139 ptr = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(filename) + 1) * sizeof(WCHAR));
1142 strcpyW(ptr, filename);
1143 elf_info->module_name = ptr;
1148 elf_unmap_file(&fmap);
1153 /******************************************************************
1154 * elf_load_file_from_path
1155 * tries to load an ELF file from a set of paths (separated by ':')
1157 static BOOL elf_load_file_from_path(HANDLE hProcess,
1158 const WCHAR* filename,
1159 unsigned long load_offset,
1161 struct elf_info* elf_info)
1165 WCHAR* pathW = NULL;
1168 if (!path) return FALSE;
1170 len = MultiByteToWideChar(CP_UNIXCP, 0, path, -1, NULL, 0);
1171 pathW = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
1172 if (!pathW) return FALSE;
1173 MultiByteToWideChar(CP_UNIXCP, 0, path, -1, pathW, len);
1175 for (s = pathW; s && *s; s = (t) ? (t+1) : NULL)
1177 t = strchrW(s, ':');
1179 fn = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(filename) + 1 + lstrlenW(s) + 1) * sizeof(WCHAR));
1182 strcatW(fn, S_SlashW);
1183 strcatW(fn, filename);
1184 ret = elf_load_file(hProcess, fn, load_offset, elf_info);
1185 HeapFree(GetProcessHeap(), 0, fn);
1187 s = (t) ? (t+1) : NULL;
1190 HeapFree(GetProcessHeap(), 0, pathW);
1194 /******************************************************************
1195 * elf_load_file_from_dll_path
1197 * Tries to load an ELF file from the dll path
1199 static BOOL elf_load_file_from_dll_path(HANDLE hProcess,
1200 const WCHAR* filename,
1201 unsigned long load_offset,
1202 struct elf_info* elf_info)
1205 unsigned int index = 0;
1208 while (!ret && (path = wine_dll_enum_load_path( index++ )))
1213 len = MultiByteToWideChar(CP_UNIXCP, 0, path, -1, NULL, 0);
1215 name = HeapAlloc( GetProcessHeap(), 0,
1216 (len + lstrlenW(filename) + 2) * sizeof(WCHAR) );
1219 MultiByteToWideChar(CP_UNIXCP, 0, path, -1, name, len);
1220 strcatW( name, S_SlashW );
1221 strcatW( name, filename );
1222 ret = elf_load_file(hProcess, name, load_offset, elf_info);
1223 HeapFree( GetProcessHeap(), 0, name );
1228 /******************************************************************
1229 * elf_search_and_load_file
1231 * lookup a file in standard ELF locations, and if found, load it
1233 static BOOL elf_search_and_load_file(struct process* pcs, const WCHAR* filename,
1234 unsigned long load_offset,
1235 struct elf_info* elf_info)
1238 struct module* module;
1239 static WCHAR S_libstdcPPW[] = {'l','i','b','s','t','d','c','+','+','\0'};
1241 if (filename == NULL || *filename == '\0') return FALSE;
1242 if ((module = module_is_already_loaded(pcs, filename)))
1244 elf_info->module = module;
1245 module->elf_info->elf_mark = 1;
1246 return module->module.SymType;
1249 if (strstrW(filename, S_libstdcPPW)) return FALSE; /* We know we can't do it */
1250 ret = elf_load_file(pcs, filename, load_offset, elf_info);
1251 /* if relative pathname, try some absolute base dirs */
1252 if (!ret && !strchrW(filename, '/'))
1254 ret = elf_load_file_from_path(pcs, filename, load_offset,
1255 getenv("PATH"), elf_info) ||
1256 elf_load_file_from_path(pcs, filename, load_offset,
1257 getenv("LD_LIBRARY_PATH"), elf_info);
1258 if (!ret) ret = elf_load_file_from_dll_path(pcs, filename, load_offset, elf_info);
1264 /******************************************************************
1265 * elf_enum_modules_internal
1267 * Enumerate ELF modules from a running process
1269 static BOOL elf_enum_modules_internal(const struct process* pcs,
1270 const WCHAR* main_name,
1271 enum_modules_cb cb, void* user)
1273 struct r_debug dbg_hdr;
1277 WCHAR bufstrW[MAX_PATH];
1279 if (!pcs->dbg_hdr_addr ||
1280 !ReadProcessMemory(pcs->handle, (void*)pcs->dbg_hdr_addr,
1281 &dbg_hdr, sizeof(dbg_hdr), NULL))
1284 /* Now walk the linked list. In all known ELF implementations,
1285 * the dynamic loader maintains this linked list for us. In some
1286 * cases the first entry doesn't appear with a name, in other cases it
1289 for (lm_addr = (void*)dbg_hdr.r_map; lm_addr; lm_addr = (void*)lm.l_next)
1291 if (!ReadProcessMemory(pcs->handle, lm_addr, &lm, sizeof(lm), NULL))
1294 if (lm.l_prev != NULL && /* skip first entry, normally debuggee itself */
1295 lm.l_name != NULL &&
1296 ReadProcessMemory(pcs->handle, lm.l_name, bufstr, sizeof(bufstr), NULL))
1298 bufstr[sizeof(bufstr) - 1] = '\0';
1299 MultiByteToWideChar(CP_UNIXCP, 0, bufstr, -1, bufstrW, sizeof(bufstrW) / sizeof(WCHAR));
1300 if (main_name && !bufstrW[0]) strcpyW(bufstrW, main_name);
1301 if (!cb(bufstrW, (unsigned long)lm.l_addr, user)) break;
1309 struct process* pcs;
1310 struct elf_info elf_info;
1313 static BOOL elf_enum_sync_cb(const WCHAR* name, unsigned long addr, void* user)
1315 struct elf_sync* es = user;
1317 elf_search_and_load_file(es->pcs, name, addr, &es->elf_info);
1321 /******************************************************************
1322 * elf_synchronize_module_list
1324 * this functions rescans the debuggee module's list and synchronizes it with
1325 * the one from 'pcs', ie:
1326 * - if a module is in debuggee and not in pcs, it's loaded into pcs
1327 * - if a module is in pcs and not in debuggee, it's unloaded from pcs
1329 BOOL elf_synchronize_module_list(struct process* pcs)
1331 struct module* module;
1334 for (module = pcs->lmodules; module; module = module->next)
1336 if (module->type == DMT_ELF && !module->is_virtual)
1337 module->elf_info->elf_mark = 0;
1341 es.elf_info.flags = ELF_INFO_MODULE;
1342 if (!elf_enum_modules_internal(pcs, NULL, elf_enum_sync_cb, &es))
1345 module = pcs->lmodules;
1348 if (module->type == DMT_ELF && !module->is_virtual &&
1349 !module->elf_info->elf_mark && !module->elf_info->elf_loader)
1351 module_remove(pcs, module);
1352 /* restart all over */
1353 module = pcs->lmodules;
1355 else module = module->next;
1360 /******************************************************************
1363 * Lookup in a running ELF process the loader, and sets its ELF link
1364 * address (for accessing the list of loaded .so libs) in pcs.
1365 * If flags is ELF_INFO_MODULE, the module for the loader is also
1366 * added as a module into pcs.
1368 static BOOL elf_search_loader(struct process* pcs, struct elf_info* elf_info)
1373 /* All binaries are loaded with WINELOADER (if run from tree) or by the
1376 if ((ptr = getenv("WINELOADER")))
1378 WCHAR tmp[MAX_PATH];
1379 MultiByteToWideChar(CP_ACP, 0, ptr, -1, tmp, sizeof(tmp) / sizeof(WCHAR));
1380 ret = elf_search_and_load_file(pcs, tmp, 0, elf_info);
1384 ret = elf_search_and_load_file(pcs, S_WineW, 0, elf_info);
1389 /******************************************************************
1390 * elf_read_wine_loader_dbg_info
1392 * Try to find a decent wine executable which could have loaded the debuggee
1394 BOOL elf_read_wine_loader_dbg_info(struct process* pcs)
1396 struct elf_info elf_info;
1398 elf_info.flags = ELF_INFO_DEBUG_HEADER | ELF_INFO_MODULE;
1399 if (!elf_search_loader(pcs, &elf_info)) return FALSE;
1400 elf_info.module->elf_info->elf_loader = 1;
1401 module_set_module(elf_info.module, S_WineLoaderW);
1402 return (pcs->dbg_hdr_addr = elf_info.dbg_hdr_addr) != 0;
1405 /******************************************************************
1408 * Enumerates the ELF loaded modules from a running target (hProc)
1409 * This function doesn't require that someone has called SymInitialize
1410 * on this very process.
1412 BOOL elf_enum_modules(HANDLE hProc, enum_modules_cb cb, void* user)
1415 struct elf_info elf_info;
1418 memset(&pcs, 0, sizeof(pcs));
1420 elf_info.flags = ELF_INFO_DEBUG_HEADER | ELF_INFO_NAME;
1421 if (!elf_search_loader(&pcs, &elf_info)) return FALSE;
1422 pcs.dbg_hdr_addr = elf_info.dbg_hdr_addr;
1423 ret = elf_enum_modules_internal(&pcs, elf_info.module_name, cb, user);
1424 HeapFree(GetProcessHeap(), 0, (char*)elf_info.module_name);
1430 struct process* pcs;
1431 struct elf_info elf_info;
1436 /******************************************************************
1439 * Callback for elf_load_module, used to walk the list of loaded
1442 static BOOL elf_load_cb(const WCHAR* name, unsigned long addr, void* user)
1444 struct elf_load* el = user;
1447 /* memcmp is needed for matches when bufstr contains also version information
1448 * el->name: libc.so, name: libc.so.6.0
1450 p = strrchrW(name, '/');
1452 if (!memcmp(p, el->name, lstrlenW(el->name) * sizeof(WCHAR)))
1454 el->ret = elf_search_and_load_file(el->pcs, name, addr, &el->elf_info);
1460 /******************************************************************
1463 * loads an ELF module and stores it in process' module list
1464 * Also, find module real name and load address from
1465 * the real loaded modules list in pcs address space
1467 struct module* elf_load_module(struct process* pcs, const WCHAR* name, unsigned long addr)
1471 TRACE("(%p %s %08lx)\n", pcs, debugstr_w(name), addr);
1473 el.elf_info.flags = ELF_INFO_MODULE;
1476 if (pcs->dbg_hdr_addr) /* we're debugging a life target */
1479 /* do only the lookup from the filename, not the path (as we lookup module
1480 * name in the process' loaded module list)
1482 el.name = strrchrW(name, '/');
1483 if (!el.name++) el.name = name;
1486 if (!elf_enum_modules_internal(pcs, NULL, elf_load_cb, &el))
1492 el.ret = elf_search_and_load_file(pcs, el.name, addr, &el.elf_info);
1494 if (!el.ret) return NULL;
1495 assert(el.elf_info.module);
1496 return el.elf_info.module;
1499 #else /* !__ELF__ */
1501 BOOL elf_synchronize_module_list(struct process* pcs)
1506 BOOL elf_fetch_file_info(const WCHAR* name, DWORD* base,
1507 DWORD* size, DWORD* checksum)
1512 BOOL elf_read_wine_loader_dbg_info(struct process* pcs)
1517 BOOL elf_enum_modules(HANDLE hProc, enum_modules_cb cb, void* user)
1522 struct module* elf_load_module(struct process* pcs, const WCHAR* name, unsigned long addr)
1527 BOOL elf_load_debug_info(struct module* module, struct elf_file_map* fmap)
1532 int elf_is_in_thunk_area(unsigned long addr,
1533 const struct elf_thunk_area* thunks)
1537 #endif /* __ELF__ */