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