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Sweden-Number/programs/winedbg/elf.c

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/*
* 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 <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 "debugger.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(winedbg);
typedef struct tagELF_DBG_INFO
{
void *elf_addr;
} ELF_DBG_INFO;
#ifdef __ELF__
/*
* 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 DEBUG_ProcessElfSymtab(DBG_MODULE* module, const char* addr,
void *load_addr, const Elf32_Shdr* symtab,
const Elf32_Shdr* strtab)
{
const char* curfile = NULL;
struct name_hash* curr_sym = NULL;
int flags;
int i;
DBG_VALUE new_value;
int nsym;
const char* strp;
const char* symname;
const Elf32_Sym* symp;
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;
/*
* Save the name of the current file, so we have a way of tracking
* static functions/data.
*/
if (ELF32_ST_TYPE(symp->st_info) == STT_FILE)
{
curfile = symname;
continue;
}
new_value.type = NULL;
new_value.addr.seg = 0;
new_value.addr.off = (unsigned long)load_addr + symp->st_value;
new_value.cookie = DV_TARGET;
flags = SYM_WINE | ((ELF32_ST_TYPE(symp->st_info) == STT_FUNC)
? SYM_FUNC : SYM_DATA);
if (ELF32_ST_BIND(symp->st_info) == STB_GLOBAL)
curr_sym = DEBUG_AddSymbol(symname, &new_value, NULL, flags);
else
curr_sym = DEBUG_AddSymbol(symname, &new_value, curfile, flags);
/*
* Record the size of the symbol. This can come in handy in
* some cases. Not really used yet, however.
*/
if (symp->st_size != 0)
DEBUG_SetSymbolSize(curr_sym, symp->st_size);
}
return TRUE;
}
/*
* 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
*/
enum DbgInfoLoad DEBUG_LoadElfStabs(DBG_MODULE* module)
{
enum DbgInfoLoad dil = DIL_ERROR;
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;
if (module->type != DMT_ELF || !module->elf_dbg_info)
{
WINE_ERR("Bad elf module '%s'\n", module->module_name);
return DIL_ERROR;
}
/* check that the file exists, and that the module hasn't been loaded yet */
if (stat(module->module_name, &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_name, O_RDONLY)) == -1) goto leave;
dil = DIL_NOINFO;
/*
* Now mmap() the file.
*/
addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (addr == (char*)0xffffffff) goto leave;
/*
* 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);
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 (stabsect != -1 && stabstrsect != -1)
{
/*
* OK, now just parse all of the stabs.
*/
if (DEBUG_ParseStabs(addr,
module->elf_dbg_info->elf_addr,
spnt[stabsect].sh_offset,
spnt[stabsect].sh_size,
spnt[stabstrsect].sh_offset,
spnt[stabstrsect].sh_size))
{
dil = DIL_LOADED;
}
else
{
dil = DIL_ERROR;
WINE_WARN("Couldn't read correctly read stabs\n");
goto leave;
}
}
else if (debugsect != -1)
{
/* Dwarf 2 debug information */
dil = DIL_NOT_SUPPORTED;
}
/* now load dynamic symbol info */
for (i = 0; i < ehptr->e_shnum; i++)
{
if ((strcmp(shstrtab + spnt[i].sh_name, ".symtab") == 0) &&
(spnt[i].sh_type == SHT_SYMTAB))
DEBUG_ProcessElfSymtab(module, addr, module->elf_dbg_info->elf_addr,
spnt + i, spnt + spnt[i].sh_link);
if ((strcmp(shstrtab + spnt[i].sh_name, ".dynsym") == 0) &&
(spnt[i].sh_type == SHT_DYNSYM))
DEBUG_ProcessElfSymtab(module, addr, module->elf_dbg_info->elf_addr,
spnt + i, spnt + spnt[i].sh_link);
}
leave:
if (addr != (char*)0xffffffff) munmap(addr, statbuf.st_size);
if (fd != -1) close(fd);
return dil;
}
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
;
}
/*
* 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 enum DbgInfoLoad DEBUG_ProcessElfFile(HANDLE hProcess,
const char* filename,
void *load_offset,
struct elf_info* elf_info)
{
static const unsigned char elf_signature[4] = { ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3 };
enum DbgInfoLoad dil = DIL_ERROR;
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;
WINE_TRACE("Processing elf file '%s' at %p\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;
dil = DIL_NOINFO;
/*
* 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);
elf_info->size = 0;
for (i = 0; i < ehptr->e_phnum; i++)
{
if (ppnt[i].p_type != PT_LOAD) continue;
elf_info->size += (ppnt[i].p_align <= 1) ? ppnt[i].p_memsz :
(ppnt[i].p_memsz + ppnt[i].p_align - 1) & ~(ppnt[i].p_align - 1);
}
for (i = 0; i < ehptr->e_shnum; i++)
{
if (strcmp(shstrtab + spnt[i].sh_name, ".dynamic") == 0 &&
spnt[i].sh_type == SHT_DYNAMIC)
{
if (elf_info->flags & ELF_INFO_DEBUG_HEADER)
{
Elf32_Dyn dyn;
char* ptr = (char*)spnt[i].sh_addr;
unsigned long len;
do
{
if (!ReadProcessMemory(hProcess, 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)
{
dil = DIL_ERROR;
goto leave;
}
elf_info->dbg_hdr_addr = dyn.d_un.d_ptr;
}
}
}
elf_info->segments[0] = elf_info->segments[1] = elf_info->segments[2] = 0;
if (elf_info->flags & ELF_INFO_PATH)
{
strncpy(elf_info->elf_path, filename, elf_info->elf_path_len);
elf_info->elf_path[elf_info->elf_path_len - 1] = '\0';
}
elf_info->load_addr = (load_offset == 0) ? (void *)ehptr->e_entry : load_offset;
if (elf_info->flags & ELF_INFO_MODULE)
{
DBG_MODULE* module;
module = DEBUG_AddModule(filename, DMT_ELF, elf_info->load_addr, elf_info->size, 0);
if (module)
{
if ((module->elf_dbg_info = DBG_alloc(sizeof(ELF_DBG_INFO))) == NULL)
{
WINE_ERR("OOM\n");
exit(0);
}
module->elf_dbg_info->elf_addr = load_offset;
module->dil = dil = DEBUG_LoadElfStabs(module);
}
else dil = DIL_ERROR;
}
leave:
if (addr != (char*)0xffffffff) munmap((void*)addr, statbuf.st_size);
if (fd != -1) close(fd);
return dil;
}
static enum DbgInfoLoad DEBUG_ProcessElfFileFromPath(HANDLE hProcess,
const char * filename,
void *load_offset,
const char* path,
struct elf_info* elf_info)
{
enum DbgInfoLoad dil = DIL_ERROR;
char *s, *t, *fn;
char* paths = NULL;
if (!path) return dil;
for (s = paths = DBG_strdup(path); s && *s; s = (t) ? (t+1) : NULL)
{
t = strchr(s, ':');
if (t) *t = '\0';
fn = (char*)DBG_alloc(strlen(filename) + 1 + strlen(s) + 1);
if (!fn) break;
strcpy(fn, s );
strcat(fn, "/");
strcat(fn, filename);
dil = DEBUG_ProcessElfFile(hProcess, fn, load_offset, elf_info);
DBG_free(fn);
if (dil != DIL_ERROR) break;
s = (t) ? (t+1) : NULL;
}
DBG_free(paths);
return dil;
}
static enum DbgInfoLoad DEBUG_ProcessElfObject(HANDLE hProcess,
const char* filename,
void *load_offset,
struct elf_info* elf_info)
{
enum DbgInfoLoad dil = DIL_ERROR;
if (filename == NULL || *filename == '\0') return DIL_ERROR;
if (DEBUG_FindModuleByName(filename, DMT_ELF))
{
assert(!(elf_info->flags & ELF_INFO_PATH));
return DIL_LOADED;
}
if (strstr(filename, "libstdc++")) return DIL_ERROR; /* We know we can't do it */
dil = DEBUG_ProcessElfFile(hProcess, filename, load_offset, elf_info);
/* if relative pathname, try some absolute base dirs */
if (dil == DIL_ERROR && !strchr(filename, '/'))
{
dil = DEBUG_ProcessElfFileFromPath(hProcess, filename, load_offset,
getenv("PATH"), elf_info);
if (dil == DIL_ERROR)
dil = DEBUG_ProcessElfFileFromPath(hProcess, filename, load_offset,
getenv("LD_LIBRARY_PATH"), elf_info);
if (dil == DIL_ERROR)
dil = DEBUG_ProcessElfFileFromPath(hProcess, filename, load_offset,
getenv("WINEDLLPATH"), elf_info);
}
DEBUG_ReportDIL(dil, "ELF", filename, load_offset);
return dil;
}
static BOOL DEBUG_WalkList(const struct r_debug* dbg_hdr)
{
void* lm_addr;
struct link_map lm;
char bufstr[256];
struct elf_info elf_info;
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 (!DEBUG_READ_MEM_VERBOSE(lm_addr, &lm, sizeof(lm)))
return FALSE;
if (lm.l_prev != NULL && /* skip first entry, normally debuggee itself */
lm.l_name != NULL &&
DEBUG_READ_MEM_VERBOSE((void*)lm.l_name, bufstr, sizeof(bufstr)))
{
bufstr[sizeof(bufstr) - 1] = '\0';
DEBUG_ProcessElfObject(DEBUG_CurrProcess->handle, bufstr,
(void *)lm.l_addr, &elf_info);
}
}
return TRUE;
}
static BOOL DEBUG_RescanElf(void)
{
struct r_debug dbg_hdr;
if (DEBUG_CurrProcess &&
DEBUG_READ_MEM_VERBOSE((void*)DEBUG_CurrProcess->dbg_hdr_addr, &dbg_hdr, sizeof(dbg_hdr)))
{
switch (dbg_hdr.r_state)
{
case RT_CONSISTENT:
DEBUG_WalkList(&dbg_hdr);
DEBUG_CheckDelayedBP();
break;
case RT_ADD:
break;
case RT_DELETE:
/* FIXME: this is not currently handled */
break;
}
}
return FALSE;
}
/******************************************************************
* DEBUG_ReadWineLoaderDbgInfo
*
* Try to find a decent wine executable which could have loader the debuggee
*/
enum DbgInfoLoad DEBUG_ReadWineLoaderDbgInfo(HANDLE hProcess, struct elf_info* elf_info)
{
const char* ptr;
enum DbgInfoLoad dil;
/* All binaries are loaded with WINELOADER (if run from tree) or by the
* main executable (either wine-kthread or wine-pthread)
* Note: the heuristic used to know whether we need to load wine-pthread or
* wine-kthread is not 100% safe
*/
elf_info->flags |= ELF_INFO_DEBUG_HEADER;
if ((ptr = getenv("WINELOADER")))
dil = DEBUG_ProcessElfObject(hProcess, ptr, 0, elf_info);
else
{
if ((dil = DEBUG_ProcessElfObject(hProcess, "wine-kthread", 0, elf_info)) == DIL_ERROR)
dil = DEBUG_ProcessElfObject(hProcess, "wine-pthread", 0, elf_info);
}
return dil;
}
/******************************************************************
* DEBUG_SetElfSoLoadBreakpoint
*
* Sets a breakpoint to handle .so loading events, so we can add debug info
* on the fly
*/
BOOL DEBUG_SetElfSoLoadBreakpoint(const struct elf_info* elf_info)
{
struct r_debug dbg_hdr;
/*
* OK, now dig into the actual tables themselves.
*/
if (!DEBUG_READ_MEM_VERBOSE((void*)elf_info->dbg_hdr_addr, &dbg_hdr, sizeof(dbg_hdr)))
return FALSE;
assert(!DEBUG_CurrProcess->dbg_hdr_addr);
DEBUG_CurrProcess->dbg_hdr_addr = elf_info->dbg_hdr_addr;
if (dbg_hdr.r_brk)
{
DBG_VALUE value;
WINE_TRACE("Setting up a breakpoint on r_brk(%lx)\n",
(unsigned long)dbg_hdr.r_brk);
DEBUG_SetBreakpoints(FALSE);
value.type = NULL;
value.cookie = DV_TARGET;
value.addr.seg = 0;
value.addr.off = (DWORD)dbg_hdr.r_brk;
DEBUG_AddBreakpoint(&value, DEBUG_RescanElf, TRUE);
DEBUG_SetBreakpoints(TRUE);
}
return DEBUG_WalkList(&dbg_hdr);
}
#else /* !__ELF__ */
enum DbgInfoLoad DEBUG_ReadWineLoaderDbgInfo(HANDLE hProcess, struct elf_info* elf_info)
{
return DIL_ERROR;
}
BOOL DEBUG_SetElfSoLoadBreakpoint(const struct elf_info* elf_info)
{
return FALSE;
}
#endif /* __ELF__ */
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