1/*
2 * Copyright (c) Christos Zoulas 2008.
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 immediately at the beginning of the file, without modification,
10 *    this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27	if (nbytes <= sizeof(elfhdr))
28		return 0;
29
30	u.l = 1;
31	(void)memcpy(&elfhdr, buf, sizeof elfhdr);
32	swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
33
34	type = elf_getu16(swap, elfhdr.e_type);
35	switch (type) {
36#ifdef ELFCORE
37	case ET_CORE:
38		if (dophn_core(ms, clazz, swap, fd,
39		    (off_t)elf_getu(swap, elfhdr.e_phoff),
40		    elf_getu16(swap, elfhdr.e_phnum),
41		    (size_t)elf_getu16(swap, elfhdr.e_phentsize),
42		    fsize, &flags) == -1)
43			return -1;
44		break;
45#endif
46	case ET_EXEC:
47	case ET_DYN:
48		if (dophn_exec(ms, clazz, swap, fd,
49		    (off_t)elf_getu(swap, elfhdr.e_phoff),
50		    elf_getu16(swap, elfhdr.e_phnum),
51		    (size_t)elf_getu16(swap, elfhdr.e_phentsize),
52		    fsize, &flags, elf_getu16(swap, elfhdr.e_shnum))
53		    == -1)
54			return -1;
55		/*FALLTHROUGH*/
56	case ET_REL:
57		if (doshn(ms, clazz, swap, fd,
58		    (off_t)elf_getu(swap, elfhdr.e_shoff),
59		    elf_getu16(swap, elfhdr.e_shnum),
60		    (size_t)elf_getu16(swap, elfhdr.e_shentsize),
61		    &flags,
62		    elf_getu16(swap, elfhdr.e_machine)) == -1)
63			return -1;
64		break;
65
66	default:
67		break;
68	}
69	return 1;
70