| /* |
| * File elf.c - processing of ELF files |
| * |
| * Copyright (C) 1996, Eric Youngdale. |
| * 1999-2004 Eric Pouech |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include "config.h" |
| |
| #include <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #ifdef HAVE_SYS_MMAN_H |
| #include <sys/mman.h> |
| #endif |
| #ifdef HAVE_UNISTD_H |
| # include <unistd.h> |
| #endif |
| #ifndef PATH_MAX |
| #define PATH_MAX MAX_PATH |
| #endif |
| |
| #include "dbghelp_private.h" |
| |
| #if defined(__svr4__) || defined(__sun) |
| #define __ELF__ |
| #endif |
| |
| #ifdef HAVE_ELF_H |
| # include <elf.h> |
| #endif |
| #ifdef HAVE_SYS_ELF32_H |
| # include <sys/elf32.h> |
| #endif |
| #ifdef HAVE_SYS_EXEC_ELF_H |
| # include <sys/exec_elf.h> |
| #endif |
| #if !defined(DT_NUM) |
| # if defined(DT_COUNT) |
| # define DT_NUM DT_COUNT |
| # else |
| /* this seems to be a satisfactory value on Solaris, which doesn't support this AFAICT */ |
| # define DT_NUM 24 |
| # endif |
| #endif |
| #ifdef HAVE_LINK_H |
| # include <link.h> |
| #endif |
| #ifdef HAVE_SYS_LINK_H |
| # include <sys/link.h> |
| #endif |
| |
| #include "wine/debug.h" |
| |
| WINE_DEFAULT_DEBUG_CHANNEL(dbghelp); |
| |
| typedef struct tagELF_DBG_INFO |
| { |
| unsigned long elf_addr; |
| } ELF_DBG_INFO; |
| |
| #ifdef __ELF__ |
| |
| #define ELF_INFO_DEBUG_HEADER 0x0001 |
| #define ELF_INFO_MODULE 0x0002 |
| |
| struct elf_info |
| { |
| unsigned flags; /* IN one (or several) of the ELF_INFO constants */ |
| unsigned long dbg_hdr_addr; /* OUT address of debug header (if ELF_INFO_DEBUG_HEADER is set) */ |
| struct module* module; /* OUT loaded module (if ELF_INFO_MODULE is set) */ |
| }; |
| |
| /****************************************************************** |
| * elf_load_symtab |
| * |
| * Walk through the entire symbol table and add any symbols we find there. |
| * This can be used in cases where we have stripped ELF shared libraries, |
| * or it can be used in cases where we have data symbols for which the address |
| * isn't encoded in the stabs. |
| * |
| * This is all really quite easy, since we don't have to worry about line |
| * numbers or local data variables. |
| */ |
| static int elf_load_symtab(struct module* module, const char* addr, |
| unsigned long load_addr, const Elf32_Shdr* symtab, |
| const Elf32_Shdr* strtab) |
| { |
| int i, nsym; |
| const char* strp; |
| const char* symname; |
| const Elf32_Sym* symp; |
| struct symt_compiland* compiland = NULL; |
| |
| symp = (Elf32_Sym*)(addr + symtab->sh_offset); |
| nsym = symtab->sh_size / sizeof(*symp); |
| strp = (char*)(addr + strtab->sh_offset); |
| |
| for (i = 0; i < nsym; i++, symp++) |
| { |
| /* Ignore certain types of entries which really aren't of that much |
| * interest. |
| */ |
| if (ELF32_ST_TYPE(symp->st_info) == STT_SECTION || |
| symp->st_shndx == SHN_UNDEF) |
| { |
| continue; |
| } |
| |
| symname = strp + symp->st_name; |
| |
| if (ELF32_ST_TYPE(symp->st_info) == STT_FILE) |
| { |
| compiland = symt_new_compiland(module, symname); |
| continue; |
| } |
| symt_new_public(module, compiland, symname, |
| load_addr + symp->st_value, symp->st_size, |
| TRUE /* FIXME */, ELF32_ST_TYPE(symp->st_info) == STT_FUNC); |
| } |
| |
| return TRUE; |
| } |
| |
| /****************************************************************** |
| * elf_load_debug_info |
| * |
| * Loads the symbolic information from ELF module stored in 'filename' |
| * the module has been loaded at 'load_offset' address, so symbols' address |
| * relocation is performed |
| * returns |
| * -1 if the file cannot be found/opened |
| * 0 if the file doesn't contain symbolic info (or this info cannot be |
| * read or parsed) |
| * 1 on success |
| */ |
| SYM_TYPE elf_load_debug_info(struct module* module) |
| { |
| SYM_TYPE sym_type = -1; |
| char* addr = (char*)0xffffffff; |
| int fd = -1; |
| struct stat statbuf; |
| const Elf32_Ehdr* ehptr; |
| const Elf32_Shdr* spnt; |
| const char* shstrtab; |
| int i; |
| int stabsect, stabstrsect, debugsect; |
| int symsect, dynsect; |
| |
| if (module->type != DMT_ELF || !module->elf_dbg_info) |
| { |
| ERR("Bad elf module '%s'\n", module->module.LoadedImageName); |
| return sym_type; |
| } |
| |
| TRACE("%s\n", module->module.LoadedImageName); |
| /* check that the file exists, and that the module hasn't been loaded yet */ |
| if (stat(module->module.LoadedImageName, &statbuf) == -1) goto leave; |
| if (S_ISDIR(statbuf.st_mode)) goto leave; |
| |
| /* |
| * Now open the file, so that we can mmap() it. |
| */ |
| if ((fd = open(module->module.LoadedImageName, O_RDONLY)) == -1) goto leave; |
| |
| /* |
| * Now mmap() the file. |
| */ |
| addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| if (addr == (char*)0xffffffff) goto leave; |
| |
| sym_type = SymNone; |
| /* |
| * Next, we need to find a few of the internal ELF headers within |
| * this thing. We need the main executable header, and the section |
| * table. |
| */ |
| ehptr = (Elf32_Ehdr*)addr; |
| spnt = (Elf32_Shdr*)(addr + ehptr->e_shoff); |
| shstrtab = (addr + spnt[ehptr->e_shstrndx].sh_offset); |
| |
| symsect = dynsect = stabsect = stabstrsect = debugsect = -1; |
| |
| for (i = 0; i < ehptr->e_shnum; i++) |
| { |
| if (strcmp(shstrtab + spnt[i].sh_name, ".stab") == 0) |
| stabsect = i; |
| if (strcmp(shstrtab + spnt[i].sh_name, ".stabstr") == 0) |
| stabstrsect = i; |
| if (strcmp(shstrtab + spnt[i].sh_name, ".debug_info") == 0) |
| debugsect = i; |
| if ((strcmp(shstrtab + spnt[i].sh_name, ".symtab") == 0) && |
| (spnt[i].sh_type == SHT_SYMTAB)) |
| symsect = i; |
| if ((strcmp(shstrtab + spnt[i].sh_name, ".dynsym") == 0) && |
| (spnt[i].sh_type == SHT_DYNSYM)) |
| dynsect = i; |
| } |
| /* start loading dynamic symbol info (so that we can get the correct address) */ |
| if (symsect != -1) |
| elf_load_symtab(module, addr, module->elf_dbg_info->elf_addr, |
| spnt + symsect, spnt + spnt[symsect].sh_link); |
| else if (dynsect != -1) |
| elf_load_symtab(module, addr, module->elf_dbg_info->elf_addr, |
| spnt + dynsect, spnt + spnt[dynsect].sh_link); |
| sym_type = SymExport; |
| |
| if (!(dbghelp_options & SYMOPT_PUBLICS_ONLY)) |
| { |
| if (stabsect != -1 && stabstrsect != -1) |
| { |
| /* OK, now just parse all of the stabs. */ |
| sym_type = stabs_parse(module, addr, module->elf_dbg_info->elf_addr, |
| spnt[stabsect].sh_offset, spnt[stabsect].sh_size, |
| spnt[stabstrsect].sh_offset, |
| spnt[stabstrsect].sh_size); |
| if (sym_type == -1) |
| { |
| WARN("Couldn't read correctly read stabs\n"); |
| goto leave; |
| } |
| } |
| else if (debugsect != -1) |
| { |
| /* Dwarf 2 debug information */ |
| FIXME("Unsupported Dwarf2 information\n"); |
| sym_type = SymNone; |
| } |
| } |
| |
| leave: |
| if (addr != (char*)0xffffffff) munmap(addr, statbuf.st_size); |
| if (fd != -1) close(fd); |
| |
| return module->module.SymType = sym_type; |
| } |
| |
| /****************************************************************** |
| * is_dt_flag_valid |
| * returns true iff the section tag is valid |
| */ |
| static unsigned is_dt_flag_valid(unsigned d_tag) |
| { |
| #ifndef DT_PROCNUM |
| #define DT_PROCNUM 0 |
| #endif |
| #ifndef DT_EXTRANUM |
| #define DT_EXTRANUM 0 |
| #endif |
| return (d_tag >= 0 && d_tag < DT_NUM + DT_PROCNUM + DT_EXTRANUM) |
| #if defined(DT_LOOS) && defined(DT_HIOS) |
| || (d_tag >= DT_LOOS && d_tag < DT_HIOS) |
| #endif |
| #if defined(DT_LOPROC) && defined(DT_HIPROC) |
| || (d_tag >= DT_LOPROC && d_tag < DT_HIPROC) |
| #endif |
| ; |
| } |
| |
| /****************************************************************** |
| * elf_load_file |
| * |
| * Loads the information for ELF module stored in 'filename' |
| * the module has been loaded at 'load_offset' address |
| * returns |
| * -1 if the file cannot be found/opened |
| * 0 if the file doesn't contain symbolic info (or this info cannot be |
| * read or parsed) |
| * 1 on success |
| */ |
| static SYM_TYPE elf_load_file(struct process* pcs, const char* filename, |
| unsigned long load_offset, struct elf_info* elf_info) |
| { |
| static const BYTE elf_signature[4] = { ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3 }; |
| SYM_TYPE sym_type = -1; |
| const char* addr = (char*)0xffffffff; |
| int fd = -1; |
| struct stat statbuf; |
| const Elf32_Ehdr* ehptr; |
| const Elf32_Shdr* spnt; |
| const Elf32_Phdr* ppnt; |
| const char* shstrtab; |
| int i; |
| DWORD delta, size; |
| |
| TRACE("Processing elf file '%s' at %08lx\n", filename, load_offset); |
| |
| /* check that the file exists, and that the module hasn't been loaded yet */ |
| if (stat(filename, &statbuf) == -1) goto leave; |
| |
| /* Now open the file, so that we can mmap() it. */ |
| if ((fd = open(filename, O_RDONLY)) == -1) goto leave; |
| |
| /* Now mmap() the file. */ |
| addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| if (addr == (char*)-1) goto leave; |
| |
| sym_type = SymNone; |
| |
| /* Next, we need to find a few of the internal ELF headers within |
| * this thing. We need the main executable header, and the section |
| * table. |
| */ |
| ehptr = (Elf32_Ehdr*)addr; |
| if (memcmp(ehptr->e_ident, elf_signature, sizeof(elf_signature))) goto leave; |
| |
| spnt = (Elf32_Shdr*)(addr + ehptr->e_shoff); |
| shstrtab = (addr + spnt[ehptr->e_shstrndx].sh_offset); |
| |
| /* if non relocatable ELF, then remove fixed address from computation |
| * otherwise, all addresses are zero based |
| */ |
| delta = (load_offset == 0) ? ehptr->e_entry : 0; |
| |
| /* grab size of module once loaded in memory */ |
| ppnt = (Elf32_Phdr*)(addr + ehptr->e_phoff); |
| size = 0; |
| for (i = 0; i < ehptr->e_phnum; i++) |
| { |
| if (ppnt[i].p_type == PT_LOAD) |
| { |
| size += (ppnt[i].p_align <= 1) ? ppnt[i].p_memsz : |
| (ppnt[i].p_memsz + ppnt[i].p_align - 1) & ~(ppnt[i].p_align - 1); |
| } |
| } |
| |
| if (elf_info->flags & ELF_INFO_DEBUG_HEADER) |
| { |
| for (i = 0; i < ehptr->e_shnum; i++) |
| { |
| if (strcmp(shstrtab + spnt[i].sh_name, ".dynamic") == 0 && |
| spnt[i].sh_type == SHT_DYNAMIC) |
| { |
| Elf32_Dyn dyn; |
| char* ptr = (char*)spnt[i].sh_addr; |
| unsigned long len; |
| |
| do |
| { |
| if (!ReadProcessMemory(pcs->handle, ptr, &dyn, sizeof(dyn), &len) || |
| len != sizeof(dyn) || !is_dt_flag_valid(dyn.d_tag)) |
| dyn.d_tag = DT_NULL; |
| ptr += sizeof(dyn); |
| } while (dyn.d_tag != DT_DEBUG && dyn.d_tag != DT_NULL); |
| if (dyn.d_tag == DT_NULL) |
| { |
| sym_type = -1; |
| goto leave; |
| } |
| elf_info->dbg_hdr_addr = dyn.d_un.d_ptr; |
| } |
| } |
| } |
| |
| if (elf_info->flags & ELF_INFO_MODULE) |
| { |
| elf_info->module = module_new(pcs, filename, DMT_ELF, |
| (load_offset) ? load_offset : ehptr->e_entry, |
| size, 0, 0); |
| if (elf_info->module) |
| { |
| if ((elf_info->module->elf_dbg_info = HeapAlloc(GetProcessHeap(), 0, sizeof(ELF_DBG_INFO))) == NULL) |
| { |
| ERR("OOM\n"); |
| exit(0); /* FIXME */ |
| } |
| elf_info->module->elf_dbg_info->elf_addr = load_offset; |
| elf_info->module->module.SymType = sym_type = |
| (dbghelp_options & SYMOPT_DEFERRED_LOADS) ? SymDeferred : |
| elf_load_debug_info(elf_info->module); |
| elf_info->module->elf_mark = 1; |
| } |
| else sym_type = -1; |
| } |
| |
| leave: |
| if (addr != (char*)0xffffffff) munmap((void*)addr, statbuf.st_size); |
| if (fd != -1) close(fd); |
| |
| return sym_type; |
| } |
| |
| /****************************************************************** |
| * elf_load_file_from_path |
| * tries to load an ELF file from a set of paths (separated by ':') |
| */ |
| static SYM_TYPE elf_load_file_from_path(HANDLE hProcess, |
| const char* filename, |
| unsigned long load_offset, |
| const char* path, |
| struct elf_info* elf_info) |
| { |
| SYM_TYPE sym_type = -1; |
| char *s, *t, *fn; |
| char* paths = NULL; |
| |
| if (!path) return sym_type; |
| |
| paths = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(path) + 1), path); |
| for (s = paths; s && *s; s = (t) ? (t+1) : NULL) |
| { |
| t = strchr(s, ':'); |
| if (t) *t = '\0'; |
| fn = HeapAlloc(GetProcessHeap(), 0, strlen(filename) + 1 + strlen(s) + 1); |
| if (!fn) break; |
| strcpy(fn, s); |
| strcat(fn, "/"); |
| strcat(fn, filename); |
| sym_type = elf_load_file(hProcess, fn, load_offset, elf_info); |
| HeapFree(GetProcessHeap(), 0, fn); |
| if (sym_type != -1) break; |
| s = (t) ? (t+1) : NULL; |
| } |
| |
| HeapFree(GetProcessHeap(), 0, paths); |
| return sym_type; |
| } |
| |
| /****************************************************************** |
| * elf_search_and_load_file |
| * |
| * lookup a file in standard ELF locations, and if found, load it |
| */ |
| static SYM_TYPE elf_search_and_load_file(struct process* pcs, const char* filename, |
| unsigned long load_offset, struct elf_info* elf_info) |
| { |
| SYM_TYPE sym_type = -1; |
| struct module* module; |
| |
| if (filename == NULL || *filename == '\0') return sym_type; |
| if ((module = module_find_by_name(pcs, filename, DMT_ELF))) |
| { |
| elf_info->module = module; |
| module->elf_mark = 1; |
| return module->module.SymType; |
| } |
| |
| if (strstr(filename, "libstdc++")) return -1; /* We know we can't do it */ |
| sym_type = elf_load_file(pcs, filename, load_offset, elf_info); |
| /* if relative pathname, try some absolute base dirs */ |
| if (sym_type == -1 && !strchr(filename, '/')) |
| { |
| sym_type = elf_load_file_from_path(pcs, filename, load_offset, |
| getenv("PATH"), elf_info); |
| if (sym_type == -1) |
| sym_type = elf_load_file_from_path(pcs, filename, load_offset, |
| getenv("LD_LIBRARY_PATH"), elf_info); |
| if (sym_type == -1) |
| sym_type = elf_load_file_from_path(pcs, filename, load_offset, |
| getenv("WINEDLLPATH"), elf_info); |
| } |
| |
| return sym_type; |
| } |
| |
| /****************************************************************** |
| * elf_synchronize_module_list |
| * |
| * this functions rescans the debuggee module's list and synchronizes it with |
| * the one from 'pcs', ie: |
| * - if a module is in debuggee and not in pcs, it's loaded into pcs |
| * - if a module is in pcs and not in debuggee, it's unloaded from pcs |
| */ |
| BOOL elf_synchronize_module_list(struct process* pcs) |
| { |
| struct r_debug dbg_hdr; |
| void* lm_addr; |
| struct link_map lm; |
| char bufstr[256]; |
| struct elf_info elf_info; |
| struct module* module; |
| |
| if (!pcs->dbg_hdr_addr) return FALSE; |
| if (!read_mem(pcs->handle, pcs->dbg_hdr_addr, &dbg_hdr, sizeof(dbg_hdr)) || |
| dbg_hdr.r_state != RT_CONSISTENT) |
| return FALSE; |
| |
| for (module = pcs->lmodules; module; module = module->next) |
| { |
| if (module->type == DMT_ELF) module->elf_mark = 0; |
| } |
| |
| elf_info.flags = ELF_INFO_MODULE; |
| /* Now walk the linked list. In all known ELF implementations, |
| * the dynamic loader maintains this linked list for us. In some |
| * cases the first entry doesn't appear with a name, in other cases it |
| * does. |
| */ |
| for (lm_addr = (void*)dbg_hdr.r_map; lm_addr; lm_addr = (void*)lm.l_next) |
| { |
| if (!read_mem(pcs->handle, (ULONG)lm_addr, &lm, sizeof(lm))) |
| return FALSE; |
| |
| if (lm.l_prev != NULL && /* skip first entry, normally debuggee itself */ |
| lm.l_name != NULL && |
| read_mem(pcs->handle, (ULONG)lm.l_name, bufstr, sizeof(bufstr))) |
| { |
| bufstr[sizeof(bufstr) - 1] = '\0'; |
| elf_search_and_load_file(pcs, bufstr, (unsigned long)lm.l_addr, |
| &elf_info); |
| } |
| } |
| |
| for (module = pcs->lmodules; module; module = module->next) |
| { |
| if (module->type == DMT_ELF && !module->elf_mark) |
| { |
| module_remove(pcs, module); |
| /* restart all over */ |
| module = pcs->lmodules; |
| } |
| } |
| return TRUE; |
| } |
| |
| /****************************************************************** |
| * elf_read_wine_loader_dbg_info |
| * |
| * Try to find a decent wine executable which could have loader the debuggee |
| */ |
| unsigned long elf_read_wine_loader_dbg_info(struct process* pcs) |
| { |
| const char* ptr; |
| SYM_TYPE sym_type; |
| struct elf_info elf_info; |
| |
| elf_info.flags = ELF_INFO_DEBUG_HEADER; |
| /* All binaries are loaded with WINELOADER (if run from tree) or by the |
| * main executable (either wine-kthread or wine-pthread) |
| * Note: the heuristic use to know whether we need to load wine-pthread or |
| * wine-kthread is not 100% safe |
| */ |
| if ((ptr = getenv("WINELOADER"))) |
| sym_type = elf_search_and_load_file(pcs, ptr, 0, &elf_info); |
| else |
| { |
| if ((sym_type = elf_search_and_load_file(pcs, "wine-kthread", 0, &elf_info)) == -1) |
| sym_type = elf_search_and_load_file(pcs, "wine-pthread", 0, &elf_info); |
| } |
| return (sym_type < 0) ? 0 : elf_info.dbg_hdr_addr; |
| } |
| |
| /****************************************************************** |
| * elf_load_module |
| * |
| * loads an ELF module and stores it in process' module list |
| * if 'sync' is TRUE, let's find module real name and load address from |
| * the real loaded modules list in pcs address space |
| */ |
| struct module* elf_load_module(struct process* pcs, const char* name) |
| { |
| struct elf_info elf_info; |
| SYM_TYPE sym_type = -1; |
| const char* p; |
| const char* xname; |
| struct r_debug dbg_hdr; |
| void* lm_addr; |
| struct link_map lm; |
| char bufstr[256]; |
| |
| TRACE("(%p %s)\n", pcs, name); |
| |
| elf_info.flags = ELF_INFO_MODULE; |
| |
| /* do only the lookup from the filename, not the path (as we lookup module name |
| * in the process' loaded module list) |
| */ |
| xname = strrchr(name, '/'); |
| if (!xname++) xname = name; |
| |
| if (!read_mem(pcs->handle, pcs->dbg_hdr_addr, &dbg_hdr, sizeof(dbg_hdr)) || |
| dbg_hdr.r_state != RT_CONSISTENT) |
| return NULL; |
| |
| for (lm_addr = (void*)dbg_hdr.r_map; lm_addr; lm_addr = (void*)lm.l_next) |
| { |
| if (!read_mem(pcs->handle, (ULONG)lm_addr, &lm, sizeof(lm))) |
| return NULL; |
| |
| if (lm.l_prev != NULL && /* skip first entry, normally debuggee itself */ |
| lm.l_name != NULL && |
| read_mem(pcs->handle, (ULONG)lm.l_name, bufstr, sizeof(bufstr))) |
| { |
| bufstr[sizeof(bufstr) - 1] = '\0'; |
| /* memcmp is needed for matches when bufstr contains also version information |
| * name: libc.so, bufstr: libc.so.6.0 |
| */ |
| p = strrchr(bufstr, '/'); |
| if (!p++) p = bufstr; |
| if (!memcmp(p, xname, strlen(xname))) |
| { |
| sym_type = elf_search_and_load_file(pcs, bufstr, |
| (unsigned long)lm.l_addr, &elf_info); |
| break; |
| } |
| } |
| } |
| if (!lm_addr || sym_type == -1) return NULL; |
| assert(elf_info.module); |
| return elf_info.module; |
| } |
| |
| #else /* !__ELF__ */ |
| |
| BOOL elf_synchronize_module_list(struct process* pcs) |
| { |
| return FALSE; |
| } |
| |
| unsigned long elf_read_wine_loader_dbg_info(struct process* pcs) |
| { |
| return -1; |
| } |
| |
| struct module* elf_load_module(struct process* pcs, const char* name) |
| { |
| return NULL; |
| } |
| |
| SYM_TYPE elf_load_debug_info(struct module* module) |
| { |
| return -1; |
| } |
| #endif /* __ELF__ */ |
