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 <assert.h>
28#include <gelf.h>
29#include <libelf.h>
30#include <limits.h>
31#include <stdint.h>
32
33#include "_libelf.h"
34
35ELFTC_VCSID("$Id: gelf_shdr.c 3177 2015-03-30 18:19:41Z emaste $");
36
37Elf32_Shdr *
38elf32_getshdr(Elf_Scn *s)
39{
40	return (_libelf_getshdr(s, ELFCLASS32));
41}
42
43Elf64_Shdr *
44elf64_getshdr(Elf_Scn *s)
45{
46	return (_libelf_getshdr(s, ELFCLASS64));
47}
48
49GElf_Shdr *
50gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
51{
52	int ec;
53	void *sh;
54	Elf32_Shdr *sh32;
55	Elf64_Shdr *sh64;
56
57	if (d == NULL) {
58		LIBELF_SET_ERROR(ARGUMENT, 0);
59		return (NULL);
60	}
61
62	if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
63		return (NULL);
64
65	ec = s->s_elf->e_class;
66	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
67
68	if (ec == ELFCLASS32) {
69		sh32 = (Elf32_Shdr *) sh;
70
71		d->sh_name      = sh32->sh_name;
72		d->sh_type      = sh32->sh_type;
73		d->sh_flags     = (Elf64_Xword) sh32->sh_flags;
74		d->sh_addr      = (Elf64_Addr) sh32->sh_addr;
75		d->sh_offset    = (Elf64_Off) sh32->sh_offset;
76		d->sh_size      = (Elf64_Xword) sh32->sh_size;
77		d->sh_link      = sh32->sh_link;
78		d->sh_info      = sh32->sh_info;
79		d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
80		d->sh_entsize   = (Elf64_Xword) sh32->sh_entsize;
81	} else {
82		sh64 = (Elf64_Shdr *) sh;
83		*d = *sh64;
84	}
85
86	return (d);
87}
88
89int
90gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
91{
92	int ec;
93	Elf *e;
94	Elf32_Shdr *sh32;
95
96
97	if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
98	    e->e_kind != ELF_K_ELF ||
99	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
100		LIBELF_SET_ERROR(ARGUMENT, 0);
101		return (0);
102	}
103
104	if (e->e_cmd == ELF_C_READ) {
105		LIBELF_SET_ERROR(MODE, 0);
106		return (0);
107	}
108
109	(void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
110
111	if (ec == ELFCLASS64) {
112		scn->s_shdr.s_shdr64 = *s;
113		return (1);
114	}
115
116	sh32 = &scn->s_shdr.s_shdr32;
117
118	sh32->sh_name	 =  s->sh_name;
119	sh32->sh_type	 =  s->sh_type;
120	LIBELF_COPY_U32(sh32, s, sh_flags);
121	LIBELF_COPY_U32(sh32, s, sh_addr);
122	LIBELF_COPY_U32(sh32, s, sh_offset);
123	LIBELF_COPY_U32(sh32, s, sh_size);
124	sh32->sh_link	 =  s->sh_link;
125	sh32->sh_info	 =  s->sh_info;
126	LIBELF_COPY_U32(sh32, s, sh_addralign);
127	LIBELF_COPY_U32(sh32, s, sh_entsize);
128
129	return (1);
130}
131