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 <assert.h>
31#include <libelf.h>
32
33#include "_libelf.h"
34
35/*
36 * Retrieve section #0, allocating a new section if needed.
37 */
38static Elf_Scn *
39_libelf_getscn0(Elf *e)
40{
41	Elf_Scn *s;
42
43	if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL)
44		return (s);
45
46	return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF));
47}
48
49int
50_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
51{
52	Elf_Scn *scn;
53
54	if (shnum >= SHN_LORESERVE) {
55		if ((scn = _libelf_getscn0(e)) == NULL)
56			return (0);
57
58		assert(scn->s_ndx == SHN_UNDEF);
59
60		if (ec == ELFCLASS32)
61			scn->s_shdr.s_shdr32.sh_size = shnum;
62		else
63			scn->s_shdr.s_shdr64.sh_size = shnum;
64
65		(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
66
67		shnum = 0;
68	}
69
70	if (ec == ELFCLASS32)
71		((Elf32_Ehdr *) eh)->e_shnum = shnum;
72	else
73		((Elf64_Ehdr *) eh)->e_shnum = shnum;
74
75
76	return (1);
77}
78
79int
80_libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx)
81{
82	Elf_Scn *scn;
83
84	if (shstrndx >= SHN_LORESERVE) {
85		if ((scn = _libelf_getscn0(e)) == NULL)
86			return (0);
87
88		assert(scn->s_ndx == SHN_UNDEF);
89
90		if (ec == ELFCLASS32)
91			scn->s_shdr.s_shdr32.sh_link = shstrndx;
92		else
93			scn->s_shdr.s_shdr64.sh_link = shstrndx;
94
95		(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
96
97		shstrndx = SHN_XINDEX;
98	}
99
100	if (ec == ELFCLASS32)
101		((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx;
102	else
103		((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx;
104
105	return (1);
106}
107
108int
109_libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum)
110{
111	Elf_Scn *scn;
112
113	if (phnum >= PN_XNUM) {
114		if ((scn = _libelf_getscn0(e)) == NULL)
115			return (0);
116
117		assert(scn->s_ndx == SHN_UNDEF);
118
119		if (ec == ELFCLASS32)
120			scn->s_shdr.s_shdr32.sh_info = phnum;
121		else
122			scn->s_shdr.s_shdr64.sh_info = phnum;
123
124		(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
125
126		phnum = PN_XNUM;
127	}
128
129	if (ec == ELFCLASS32)
130		((Elf32_Ehdr *) eh)->e_phnum = phnum;
131	else
132		((Elf64_Ehdr *) eh)->e_phnum = phnum;
133
134	return (1);
135}
136
137