1 /* $NetBSD: libelf_extended.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2006,2008 Joseph Koshy
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #if HAVE_NBTOOL_CONFIG_H
30 # include "nbtool_config.h"
31 #endif
32
33 #include <sys/cdefs.h>
34
35 #include <assert.h>
36 #include <libelf.h>
37
38 #include "_libelf.h"
39
40 __RCSID("$NetBSD: libelf_extended.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
41 ELFTC_VCSID("Id: libelf_extended.c 2225 2011-11-26 18:55:54Z jkoshy ");
42
43 /*
44 * Retrieve section #0, allocating a new section if needed.
45 */
46 static Elf_Scn *
_libelf_getscn0(Elf * e)47 _libelf_getscn0(Elf *e)
48 {
49 Elf_Scn *s;
50
51 if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL)
52 return (s);
53
54 return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF));
55 }
56
57 int
_libelf_setshnum(Elf * e,void * eh,int ec,size_t shnum)58 _libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
59 {
60 Elf_Scn *scn;
61
62 if (shnum >= SHN_LORESERVE) {
63 if ((scn = _libelf_getscn0(e)) == NULL)
64 return (0);
65
66 assert(scn->s_ndx == SHN_UNDEF);
67
68 if (ec == ELFCLASS32)
69 scn->s_shdr.s_shdr32.sh_size = shnum;
70 else
71 scn->s_shdr.s_shdr64.sh_size = shnum;
72
73 (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
74
75 shnum = 0;
76 }
77
78 if (ec == ELFCLASS32)
79 ((Elf32_Ehdr *) eh)->e_shnum = shnum;
80 else
81 ((Elf64_Ehdr *) eh)->e_shnum = shnum;
82
83
84 return (1);
85 }
86
87 int
_libelf_setshstrndx(Elf * e,void * eh,int ec,size_t shstrndx)88 _libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx)
89 {
90 Elf_Scn *scn;
91
92 if (shstrndx >= SHN_LORESERVE) {
93 if ((scn = _libelf_getscn0(e)) == NULL)
94 return (0);
95
96 assert(scn->s_ndx == SHN_UNDEF);
97
98 if (ec == ELFCLASS32)
99 scn->s_shdr.s_shdr32.sh_link = shstrndx;
100 else
101 scn->s_shdr.s_shdr64.sh_link = shstrndx;
102
103 (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
104
105 shstrndx = SHN_XINDEX;
106 }
107
108 if (ec == ELFCLASS32)
109 ((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx;
110 else
111 ((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx;
112
113 return (1);
114 }
115
116 int
_libelf_setphnum(Elf * e,void * eh,int ec,size_t phnum)117 _libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum)
118 {
119 Elf_Scn *scn;
120
121 if (phnum >= PN_XNUM) {
122 if ((scn = _libelf_getscn0(e)) == NULL)
123 return (0);
124
125 assert(scn->s_ndx == SHN_UNDEF);
126
127 if (ec == ELFCLASS32)
128 scn->s_shdr.s_shdr32.sh_info = phnum;
129 else
130 scn->s_shdr.s_shdr64.sh_info = phnum;
131
132 (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
133
134 phnum = PN_XNUM;
135 }
136
137 if (ec == ELFCLASS32)
138 ((Elf32_Ehdr *) eh)->e_phnum = phnum;
139 else
140 ((Elf64_Ehdr *) eh)->e_phnum = phnum;
141
142 return (1);
143 }
144