elf_memory.c revision 164190
1/*- 2 * Copyright (c) 2006 Joseph Koshy 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/lib/libelf/elf_memory.c 164190 2006-11-11 17:16:35Z jkoshy $"); 29 30#include <ar.h> 31#include <libelf.h> 32#include <string.h> 33 34#include "_libelf.h" 35 36Elf * 37elf_memory(char *image, size_t sz) 38{ 39 Elf *e; 40 41 if (LIBELF_PRIVATE(version) == EV_NONE) { 42 LIBELF_SET_ERROR(SEQUENCE, 0); 43 return (NULL); 44 } 45 46 if (image == NULL || sz == 0) { 47 LIBELF_SET_ERROR(ARGUMENT, 0); 48 return (NULL); 49 } 50 51 if ((e = _libelf_allocate_elf()) == NULL) 52 return (NULL); 53 54 e->e_cmd = ELF_C_READ; 55 e->e_rawfile = image; 56 e->e_rawsize = sz; 57 58#undef LIBELF_IS_ELF 59#define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && \ 60 (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 && \ 61 (P)[EI_MAG3] == ELFMAG3) 62 63 if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) { 64 _libelf_init_elf(e, ELF_K_ELF); 65 e->e_class = image[EI_CLASS]; 66 e->e_byteorder = image[EI_DATA]; 67 e->e_version = image[EI_VERSION]; 68 69 if (e->e_version > EV_CURRENT) { 70 e = _libelf_release_elf(e); 71 LIBELF_SET_ERROR(VERSION, 0); 72 return (NULL); 73 } 74 75 if ((e->e_byteorder != ELFDATA2LSB && e->e_byteorder != 76 ELFDATA2MSB) || (e->e_class != ELFCLASS32 && e->e_class != 77 ELFCLASS64)) { 78 e = _libelf_release_elf(e); 79 LIBELF_SET_ERROR(HEADER, 0); 80 return (NULL); 81 } 82 83 } else if (sz >= SARMAG && 84 strncmp(image, ARMAG, (size_t) SARMAG) == 0) { 85 _libelf_init_elf(e, ELF_K_AR); 86 e = _libelf_ar_open(e); 87 } else 88 _libelf_init_elf(e, ELF_K_NONE); 89 90 return (e); 91} 92