246 lines
6.9 KiB
C
246 lines
6.9 KiB
C
/* $NetBSD: elf32.c,v 1.10 2013/10/19 17:10:17 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2006 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Andrew Doran.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1996 Christopher G. Demetriou
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed for the
|
|
* NetBSD Project. See http://www.NetBSD.org/ for
|
|
* information about NetBSD.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if !defined(lint)
|
|
__RCSID("$NetBSD: elf32.c,v 1.10 2013/10/19 17:10:17 christos Exp $");
|
|
#endif
|
|
|
|
#ifndef ELFSIZE
|
|
#define ELFSIZE 32
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/exec_elf.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <dev/lockstat.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <err.h>
|
|
|
|
#include "extern.h"
|
|
|
|
#if (ELFSIZE == 32)
|
|
#define NAME(x) x##32
|
|
#elif (ELFSIZE == 64)
|
|
#define NAME(x) x##64
|
|
#endif
|
|
|
|
static int nsyms;
|
|
static Elf_Sym *symp;
|
|
static char *strp;
|
|
|
|
int
|
|
NAME(loadsym)(int fd)
|
|
{
|
|
Elf_Shdr symhdr, strhdr;
|
|
Elf_Ehdr ehdr;
|
|
size_t sz;
|
|
off_t off;
|
|
int i;
|
|
|
|
/*
|
|
* Read the ELF header and make sure it's OK.
|
|
*/
|
|
if (pread(fd, &ehdr, sizeof(ehdr), 0) != sizeof(ehdr))
|
|
return -1;
|
|
|
|
if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
|
|
ehdr.e_ident[EI_CLASS] != ELFCLASS)
|
|
return -1;
|
|
|
|
switch (ehdr.e_machine) {
|
|
ELFDEFNNAME(MACHDEP_ID_CASES)
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Find the symbol table header, and make sure the binary isn't
|
|
* stripped.
|
|
*/
|
|
off = ehdr.e_shoff;
|
|
for (i = 0; i < ehdr.e_shnum; i++, off += sizeof(symhdr)) {
|
|
sz = pread(fd, &symhdr, sizeof(symhdr), off);
|
|
if (sz != sizeof(symhdr))
|
|
err(EXIT_FAILURE, "pread (section headers)");
|
|
if (symhdr.sh_type == SHT_SYMTAB)
|
|
break;
|
|
}
|
|
if (i == ehdr.e_shnum || symhdr.sh_offset == 0)
|
|
err(EXIT_FAILURE, "namelist is stripped");
|
|
|
|
/*
|
|
* Pull in the string table header, and then read in both the symbol
|
|
* table and string table proper.
|
|
*
|
|
* XXX We can't use mmap(), as /dev/ksyms doesn't support mmap yet.
|
|
*/
|
|
off = ehdr.e_shoff + symhdr.sh_link * sizeof(symhdr);
|
|
if (pread(fd, &strhdr, sizeof(strhdr), off) != sizeof(strhdr))
|
|
err(EXIT_FAILURE, "pread");
|
|
|
|
if ((symp = malloc(symhdr.sh_size)) == NULL)
|
|
err(EXIT_FAILURE, "malloc (symbol table)");
|
|
sz = pread(fd, symp, symhdr.sh_size, symhdr.sh_offset);
|
|
if (sz != symhdr.sh_size)
|
|
err(EXIT_FAILURE, "pread (symbol table)");
|
|
|
|
if ((strp = malloc(strhdr.sh_size)) == NULL)
|
|
err(EXIT_FAILURE, "malloc (string table)");
|
|
sz = pread(fd, strp, strhdr.sh_size, strhdr.sh_offset);
|
|
if (sz != strhdr.sh_size)
|
|
err(EXIT_FAILURE, "pread (string table)");
|
|
|
|
nsyms = (int)(symhdr.sh_size / sizeof(Elf_Sym));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
NAME(findsym)(findsym_t find, char *name, uintptr_t *start, uintptr_t *end)
|
|
{
|
|
uintptr_t sa, ea;
|
|
int i, off;
|
|
Elf_Byte st;
|
|
|
|
switch (find) {
|
|
case LOCK_BYNAME:
|
|
case LOCK_BYADDR:
|
|
st = STT_OBJECT;
|
|
break;
|
|
case FUNC_BYNAME:
|
|
case FUNC_BYADDR:
|
|
st = STT_FUNC;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
|
|
#ifdef dump_core
|
|
static int lastptr[FIND_MAX];
|
|
for (i = lastptr[find];;) {
|
|
#else
|
|
for (i = 0; i < nsyms; i++) {
|
|
#endif
|
|
switch (find) {
|
|
case LOCK_BYNAME:
|
|
case FUNC_BYNAME:
|
|
if (ELF_ST_TYPE(symp[i].st_info) != st)
|
|
break;
|
|
if (strcmp(&strp[symp[i].st_name], name) != 0)
|
|
break;
|
|
*start = (uintptr_t)symp[i].st_value;
|
|
*end = *start + (uintptr_t)symp[i].st_size;
|
|
goto found;
|
|
|
|
case LOCK_BYADDR:
|
|
case FUNC_BYADDR:
|
|
if (ELF_ST_TYPE(symp[i].st_info) != st)
|
|
break;
|
|
sa = (uintptr_t)symp[i].st_value;
|
|
ea = sa + (uintptr_t)symp[i].st_size - 1;
|
|
if (*start < sa || *start > ea)
|
|
break;
|
|
off = (int)(*start - sa);
|
|
*start = sa;
|
|
if (end != NULL)
|
|
*end = ea;
|
|
if (name == NULL)
|
|
goto found;
|
|
if (off == 0)
|
|
strlcpy(name, &strp[symp[i].st_name],
|
|
NAME_SIZE);
|
|
else
|
|
snprintf(name, NAME_SIZE, "%s+%x",
|
|
&strp[symp[i].st_name], off);
|
|
goto found;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
#ifdef dump_core
|
|
if (++i >= nsyms)
|
|
i = 0;
|
|
if (i == lastptr[find])
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
return -1;
|
|
|
|
found:
|
|
#ifdef dump_core
|
|
lastptr[find] = i;
|
|
#endif
|
|
return 0;
|
|
}
|