1 /* $NetBSD: libelf_memory.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2011 Joseph Koshy
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #if HAVE_NBTOOL_CONFIG_H
30 # include "nbtool_config.h"
31 #endif
32
33 #include <ar.h>
34 #include <assert.h>
35 #include <string.h>
36 #include <libelf.h>
37
38 #include "_libelf.h"
39
40 __RCSID("$NetBSD: libelf_memory.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
41 ELFTC_VCSID("Id: libelf_memory.c 2368 2011-12-29 06:34:28Z jkoshy ");
42
43 /*
44 * Create an ELF descriptor for a memory image, optionally reporting
45 * parse errors.
46 */
47
48 Elf *
_libelf_memory(char * image,size_t sz,int reporterror)49 _libelf_memory(char *image, size_t sz, int reporterror)
50 {
51 Elf *e;
52 int e_class;
53 enum Elf_Error error;
54 unsigned int e_byteorder, e_version;
55
56 assert(image != NULL);
57 assert(sz > 0);
58
59 if ((e = _libelf_allocate_elf()) == NULL)
60 return (NULL);
61
62 e->e_cmd = ELF_C_READ;
63 e->e_rawfile = image;
64 e->e_rawsize = sz;
65
66 #undef LIBELF_IS_ELF
67 #define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && \
68 (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 && \
69 (P)[EI_MAG3] == ELFMAG3)
70
71 if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) {
72 e_byteorder = image[EI_DATA];
73 e_class = image[EI_CLASS];
74 e_version = image[EI_VERSION];
75
76 error = ELF_E_NONE;
77
78 if (e_version > EV_CURRENT)
79 error = ELF_E_VERSION;
80 else if ((e_byteorder != ELFDATA2LSB && e_byteorder !=
81 ELFDATA2MSB) || (e_class != ELFCLASS32 && e_class !=
82 ELFCLASS64))
83 error = ELF_E_HEADER;
84
85 if (error != ELF_E_NONE) {
86 if (reporterror) {
87 LIBELF_PRIVATE(error) = LIBELF_ERROR(error, 0);
88 (void) _libelf_release_elf(e);
89 return (NULL);
90 }
91 } else {
92 _libelf_init_elf(e, ELF_K_ELF);
93
94 e->e_byteorder = e_byteorder;
95 e->e_class = e_class;
96 e->e_version = e_version;
97 }
98 } else if (sz >= SARMAG &&
99 strncmp(image, ARMAG, (size_t) SARMAG) == 0)
100 return (_libelf_ar_open(e, reporterror));
101
102 return (e);
103 }
104