245 lines
6.9 KiB
C
245 lines
6.9 KiB
C
/* $NetBSD: elf32.c,v 1.8 2009/04/16 06:14:13 lukem Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the
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* NetBSD Project. See http://www.NetBSD.org/ for
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* information about NetBSD.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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*/
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#include <sys/cdefs.h>
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#if !defined(lint)
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__RCSID("$NetBSD: elf32.c,v 1.8 2009/04/16 06:14:13 lukem Exp $");
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#endif
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#ifndef ELFSIZE
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#define ELFSIZE 32
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#endif
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#include <sys/param.h>
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#include <sys/exec_elf.h>
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#include <sys/queue.h>
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#include <dev/lockstat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <err.h>
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#include "extern.h"
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#if (ELFSIZE == 32)
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#define NAME(x) x##32
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#elif (ELFSIZE == 64)
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#define NAME(x) x##64
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#endif
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static int nsyms;
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static Elf_Sym *symp;
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static char *strp;
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int
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NAME(loadsym)(int fd)
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{
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Elf_Shdr symhdr, strhdr;
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Elf_Ehdr ehdr;
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size_t sz;
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off_t off;
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int i;
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/*
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* Read the ELF header and make sure it's OK.
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*/
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if (pread(fd, &ehdr, sizeof(ehdr), 0) != sizeof(ehdr))
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return -1;
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if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
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ehdr.e_ident[EI_CLASS] != ELFCLASS)
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return -1;
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switch (ehdr.e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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return -1;
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}
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/*
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* Find the symbol table header, and make sure the binary isn't
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* stripped.
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*/
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off = ehdr.e_shoff;
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for (i = 0; i < ehdr.e_shnum; i++, off += sizeof(symhdr)) {
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sz = pread(fd, &symhdr, sizeof(symhdr), off);
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if (sz != sizeof(symhdr))
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err(EXIT_FAILURE, "pread (section headers)");
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if (symhdr.sh_type == SHT_SYMTAB)
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break;
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}
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if (i == ehdr.e_shnum || symhdr.sh_offset == 0)
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err(EXIT_FAILURE, "namelist is stripped");
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/*
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* Pull in the string table header, and then read in both the symbol
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* table and string table proper.
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*
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* XXX We can't use mmap(), as /dev/ksyms doesn't support mmap yet.
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*/
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off = ehdr.e_shoff + symhdr.sh_link * sizeof(symhdr);
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if (pread(fd, &strhdr, sizeof(strhdr), off) != sizeof(strhdr))
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err(EXIT_FAILURE, "pread");
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if ((symp = malloc(symhdr.sh_size)) == NULL)
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err(EXIT_FAILURE, "malloc (symbol table)");
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sz = pread(fd, symp, symhdr.sh_size, symhdr.sh_offset );
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if (sz != symhdr.sh_size)
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err(EXIT_FAILURE, "pread (symbol table)");
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if ((strp = malloc(strhdr.sh_size)) == NULL)
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err(EXIT_FAILURE, "malloc (string table)");
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sz = pread(fd, strp, strhdr.sh_size, strhdr.sh_offset);
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if (sz != strhdr.sh_size)
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err(EXIT_FAILURE, "pread (string table)");
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nsyms = (int)(symhdr.sh_size / sizeof(Elf_Sym));
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return 0;
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}
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int
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NAME(findsym)(findsym_t find, char *name, uintptr_t *start, uintptr_t *end)
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{
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static int lastptr[FIND_MAX];
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uintptr_t sa, ea;
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int i, rv, off;
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Elf_Byte st;
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switch (find) {
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case LOCK_BYNAME:
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case LOCK_BYADDR:
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st = STT_OBJECT;
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break;
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case FUNC_BYNAME:
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case FUNC_BYADDR:
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st = STT_FUNC;
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break;
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default:
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return -1;
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}
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rv = -1;
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#ifdef dump_core
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for (i = lastptr[find];;) {
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#else
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for (i = 0; i < nsyms; i++) {
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#endif
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switch (find) {
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case LOCK_BYNAME:
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case FUNC_BYNAME:
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if (ELF_ST_TYPE(symp[i].st_info) != st)
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break;
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if (strcmp(&strp[symp[i].st_name], name) != 0)
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break;
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*start = (uintptr_t)symp[i].st_value;
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*end = *start + (uintptr_t)symp[i].st_size;
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goto found;
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case LOCK_BYADDR:
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case FUNC_BYADDR:
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if (ELF_ST_TYPE(symp[i].st_info) != st)
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break;
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sa = (uintptr_t)symp[i].st_value;
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ea = sa + (uintptr_t)symp[i].st_size - 1;
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if (*start < sa || *start > ea)
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break;
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off = (int)(*start - sa);
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*start = sa;
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if (end != NULL)
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*end = ea;
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if (name == NULL)
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goto found;
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if (off == 0)
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strlcpy(name, &strp[symp[i].st_name],
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NAME_SIZE);
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else
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snprintf(name, NAME_SIZE, "%s+%x",
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&strp[symp[i].st_name], off);
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goto found;
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default:
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break;
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}
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#ifdef dump_core
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if (++i >= nsyms)
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i = 0;
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if (i == lastptr[find])
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return -1;
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#endif
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}
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return -1;
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found:
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lastptr[find] = i;
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return 0;
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}
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