gelf_shdr.c revision 260697 
1/*-
2 * Copyright (c) 2006,2008 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
29#include <assert.h>
30#include <gelf.h>
31#include <libelf.h>
32#include <limits.h>
33
34#include "_libelf.h"
35
36ELFTC_VCSID("$Id: gelf_shdr.c 2268 2011-12-03 17:05:11Z jkoshy $");
37
38Elf32_Shdr *
39elf32_getshdr(Elf_Scn *s)
40{
41	return (_libelf_getshdr(s, ELFCLASS32));
42}
43
44Elf64_Shdr *
45elf64_getshdr(Elf_Scn *s)
46{
47	return (_libelf_getshdr(s, ELFCLASS64));
48}
49
50GElf_Shdr *
51gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
52{
53	int ec;
54	void *sh;
55	Elf32_Shdr *sh32;
56	Elf64_Shdr *sh64;
57
58	if (d == NULL) {
59		LIBELF_SET_ERROR(ARGUMENT, 0);
60		return (NULL);
61	}
62
63	if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
64		return (NULL);
65
66	ec = s->s_elf->e_class;
67	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
68
69	if (ec == ELFCLASS32) {
70		sh32 = (Elf32_Shdr *) sh;
71
72		d->sh_name      = sh32->sh_name;
73		d->sh_type      = sh32->sh_type;
74		d->sh_flags     = (Elf64_Xword) sh32->sh_flags;
75		d->sh_addr      = (Elf64_Addr) sh32->sh_addr;
76		d->sh_offset    = (Elf64_Off) sh32->sh_offset;
77		d->sh_size      = (Elf64_Xword) sh32->sh_size;
78		d->sh_link      = sh32->sh_link;
79		d->sh_info      = sh32->sh_info;
80		d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
81		d->sh_entsize   = (Elf64_Xword) sh32->sh_entsize;
82	} else {
83		sh64 = (Elf64_Shdr *) sh;
84		*d = *sh64;
85	}
86
87	return (d);
88}
89
90int
91gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
92{
93	int ec;
94	Elf *e;
95	Elf32_Shdr *sh32;
96
97
98	if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
99	    e->e_kind != ELF_K_ELF ||
100	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
101		LIBELF_SET_ERROR(ARGUMENT, 0);
102		return (0);
103	}
104
105	if (e->e_cmd == ELF_C_READ) {
106		LIBELF_SET_ERROR(MODE, 0);
107		return (0);
108	}
109
110	(void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
111
112	if (ec == ELFCLASS64) {
113		scn->s_shdr.s_shdr64 = *s;
114		return (1);
115	}
116
117	sh32 = &scn->s_shdr.s_shdr32;
118
119	sh32->sh_name	 =  s->sh_name;
120	sh32->sh_type	 =  s->sh_type;
121	LIBELF_COPY_U32(sh32, s, sh_flags);
122	LIBELF_COPY_U32(sh32, s, sh_addr);
123	LIBELF_COPY_U32(sh32, s, sh_offset);
124	LIBELF_COPY_U32(sh32, s, sh_size);
125	sh32->sh_link	 =  s->sh_link;
126	sh32->sh_info	 =  s->sh_info;
127	LIBELF_COPY_U32(sh32, s, sh_addralign);
128	LIBELF_COPY_U32(sh32, s, sh_entsize);
129
130	return (1);
131}
132