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("$FreeBSD$");
29
30 #include <ar.h>
31 #include <libelf.h>
32 #include <string.h>
33
34 #include "_libelf.h"
35
36 Elf *
elf_memory(char * image,size_t sz)37 elf_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