133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/* $NetBSD: exec_elf32.c,v 1.11 2009/07/30 15:56:01 tsutsui Exp $ */
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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. 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_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: exec_elf32.c,v 1.11 2009/07/30 15:56:01 tsutsui Exp $");
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#endif /* not lint */
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#ifndef ELFSIZE
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#define ELFSIZE 32
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#endif
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#include <sys/types.h>
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#include <stdio.h>
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#include <string.h>
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#include "extern.h"
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#if defined(NLIST_ELF32) || defined(NLIST_ELF64)
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#include <sys/exec_elf.h>
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#endif
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#if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
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(defined(NLIST_ELF64) && (ELFSIZE == 64))
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#define check(off, size) ((off < 0) || (off + size > mappedsize))
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#define BAD do { rv = -1; goto out; } while (0)
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int
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ELFNAMEEND(check)(mappedfile, mappedsize)
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const char *mappedfile;
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size_t mappedsize;
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{
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const Elf_Ehdr *ehdrp;
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int rv;
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rv = 0;
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if (check(0, sizeof *ehdrp))
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BAD;
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ehdrp = (const Elf_Ehdr *)&mappedfile[0];
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if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
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ehdrp->e_ident[EI_CLASS] != ELFCLASS)
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BAD;
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switch (ehdrp->e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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BAD;
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}
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out:
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return (rv);
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}
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int
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ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
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const char *mappedfile;
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size_t mappedsize, *fileoffp;
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u_long vmaddr;
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{
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const Elf_Ehdr *ehdrp;
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const Elf_Phdr *phdrp;
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Elf_Off phdr_off;
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Elf_Word phdr_size;
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#if (ELFSIZE == 32)
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Elf32_Half nphdr, i;
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#elif (ELFSIZE == 64)
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Elf64_Half nphdr, i;
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#endif
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int rv;
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rv = 0;
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ehdrp = (const Elf_Ehdr *)&mappedfile[0];
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nphdr = ehdrp->e_phnum;
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phdr_off = ehdrp->e_phoff;
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phdr_size = sizeof(Elf_Phdr) * nphdr;
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if (check(0, phdr_off + phdr_size))
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BAD;
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phdrp = (const Elf_Phdr *)&mappedfile[phdr_off];
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#define IS_TEXT(p) (p.p_flags & PF_X)
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#define IS_DATA(p) (p.p_flags & PF_W)
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for (i = 0; i < nphdr; i++) {
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if ((IS_TEXT(phdrp[i]) || IS_DATA(phdrp[i])) &&
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phdrp[i].p_vaddr <= vmaddr &&
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vmaddr < phdrp[i].p_vaddr + phdrp[i].p_filesz) {
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*fileoffp = vmaddr -
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phdrp[i].p_vaddr + phdrp[i].p_offset;
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break;
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}
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}
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if (i == nphdr)
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BAD;
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out:
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return (rv);
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}
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#endif /* include this size of ELF */
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