NetBSD/usr.sbin/mdsetimage/exec_elf32.c

131 lines
3.5 KiB
C

/* $NetBSD: exec_elf32.c,v 1.6 1999/11/04 02:00:19 erh Exp $ */
/*
* 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 by Christopher G. Demetriou
* for the NetBSD Project.
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: exec_elf32.c,v 1.6 1999/11/04 02:00:19 erh Exp $");
#endif /* not lint */
#ifndef ELFSIZE
#define ELFSIZE 32
#endif
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"
#if defined(NLIST_ELF32) || defined(NLIST_ELF64)
#include <sys/exec_elf.h>
#endif
#if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
(defined(NLIST_ELF64) && (ELFSIZE == 64))
#define check(off, size) ((off < 0) || (off + size > mappedsize))
#define BAD do { rv = -1; goto out; } while (0)
int
ELFNAMEEND(check)(mappedfile, mappedsize)
const char *mappedfile;
size_t mappedsize;
{
Elf_Ehdr *ehdrp;
int rv;
rv = 0;
if (check(0, sizeof *ehdrp))
BAD;
ehdrp = (Elf_Ehdr *)&mappedfile[0];
if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
ehdrp->e_ident[EI_CLASS] != ELFCLASS)
BAD;
switch (ehdrp->e_machine) {
ELFDEFNNAME(MACHDEP_ID_CASES)
default:
BAD;
}
out:
return (rv);
}
int
ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
const char *mappedfile;
size_t mappedsize, *fileoffp;
u_long vmaddr;
{
Elf_Ehdr *ehdrp;
Elf_Shdr *shdrp;
Elf_Off shdr_off;
Elf_Word shdr_size;
#if (ELFSIZE == 32)
Elf32_Half nshdr, i;
#elif (ELFSIZE == 64)
Elf64_Half nshdr, i;
#endif
int rv;
rv = 0;
ehdrp = (Elf_Ehdr *)&mappedfile[0];
nshdr = ehdrp->e_shnum;
shdr_off = ehdrp->e_shoff;
shdr_size = ehdrp->e_shentsize * nshdr;
if (check(shdr_off, shdr_size) ||
(sizeof *shdrp != ehdrp->e_shentsize))
BAD;
shdrp = (Elf_Shdr *)&mappedfile[shdr_off];
for (i = 0; i < nshdr; i++) {
if (shdrp[i].sh_addr <= vmaddr &&
vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) {
*fileoffp = vmaddr -
shdrp[i].sh_addr + shdrp[i].sh_offset;
break;
}
}
if (i == nshdr)
BAD;
out:
return (rv);
}
#endif /* include this size of ELF */