elf_memory.c revision 4484:7c56a6c9c265 
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
28#include <ar.h>
29#include "libelf.h"
30#include <string.h>
31
32#include "_libelf.h"
33
34Elf *
35elf_memory(char *image, size_t sz)
36{
37        Elf *e;
38
39        if (LIBELF_PRIVATE(version) == EV_NONE) {
40                LIBELF_SET_ERROR(SEQUENCE, 0);
41                return (NULL);
42        }
43
44        if (image == NULL || sz == 0) {
45                LIBELF_SET_ERROR(ARGUMENT, 0);
46                return (NULL);
47        }
48
49        if ((e = _libelf_allocate_elf()) == NULL)
50                return (NULL);
51
52        e->e_cmd = ELF_C_READ;
53        e->e_rawfile = image;
54        e->e_rawsize = sz;
55
56#undef	LIBELF_IS_ELF
57#define	LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && 		\
58        (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 &&	\
59        (P)[EI_MAG3] == ELFMAG3)
60
61        if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
62                _libelf_init_elf(e, ELF_K_ELF);
63                e->e_class = image[EI_CLASS];
64                e->e_byteorder = image[EI_DATA];
65                e->e_version = image[EI_VERSION];
66
67                if (e->e_version > EV_CURRENT) {
68                        e = _libelf_release_elf(e);
69                        LIBELF_SET_ERROR(VERSION, 0);
70                        return (NULL);
71                }
72
73                if ((e->e_byteorder != ELFDATA2LSB && e->e_byteorder !=
74                    ELFDATA2MSB) || (e->e_class != ELFCLASS32 && e->e_class !=
75                    ELFCLASS64)) {
76                        e = _libelf_release_elf(e);
77                        LIBELF_SET_ERROR(HEADER, 0);
78                        return (NULL);
79                }
80
81        } else if (sz >= SARMAG &&
82            strncmp(image, ARMAG, (size_t) SARMAG) == 0) {
83                _libelf_init_elf(e, ELF_K_AR);
84                e = _libelf_ar_open(e);
85        } else
86                _libelf_init_elf(e, ELF_K_NONE);
87
88        return (e);
89}
90