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 <assert.h>
28#include "libelf.h"
29
30#include "_libelf.h"
31
32/*
33 * Retrieve section #0, allocating a new section if needed.
34 */
35static Elf_Scn *
36_libelf_getscn0(Elf *e)
37{
38        Elf_Scn *s;
39
40        if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL)
41                return (s);
42
43        return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF));
44}
45
46int
47_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
48{
49        Elf_Scn *scn;
50
51        if (shnum >= SHN_LORESERVE) {
52                if ((scn = _libelf_getscn0(e)) == NULL)
53                        return (0);
54
55                assert(scn->s_ndx == SHN_UNDEF);
56
57                if (ec == ELFCLASS32)
58                        scn->s_shdr.s_shdr32.sh_size = shnum;
59                else
60                        scn->s_shdr.s_shdr64.sh_size = shnum;
61
62                (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
63
64                shnum = 0;
65        }
66
67        if (ec == ELFCLASS32)
68                ((Elf32_Ehdr *) eh)->e_shnum = shnum;
69        else
70                ((Elf64_Ehdr *) eh)->e_shnum = shnum;
71
72
73        return (1);
74}
75
76int
77_libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx)
78{
79        Elf_Scn *scn;
80
81        if (shstrndx >= SHN_LORESERVE) {
82                if ((scn = _libelf_getscn0(e)) == NULL)
83                        return (0);
84
85                assert(scn->s_ndx == SHN_UNDEF);
86
87                if (ec == ELFCLASS32)
88                        scn->s_shdr.s_shdr32.sh_link = shstrndx;
89                else
90                        scn->s_shdr.s_shdr64.sh_link = shstrndx;
91
92                (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
93
94                shstrndx = SHN_XINDEX;
95        }
96
97        if (ec == ELFCLASS32)
98                ((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx;
99        else
100                ((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx;
101
102        return (1);
103}
104
105int
106_libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum)
107{
108        Elf_Scn *scn;
109
110        if (phnum >= PN_XNUM) {
111                if ((scn = _libelf_getscn0(e)) == NULL)
112                        return (0);
113
114                assert(scn->s_ndx == SHN_UNDEF);
115
116                if (ec == ELFCLASS32)
117                        scn->s_shdr.s_shdr32.sh_info = phnum;
118                else
119                        scn->s_shdr.s_shdr64.sh_info = phnum;
120
121                (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
122
123                phnum = PN_XNUM;
124        }
125
126        if (ec == ELFCLASS32)
127                ((Elf32_Ehdr *) eh)->e_phnum = phnum;
128        else
129                ((Elf64_Ehdr *) eh)->e_phnum = phnum;
130
131        return (1);
132}
133
134