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 <sys/limits.h>
31
32 #include <gelf.h>
33 #include <libelf.h>
34
35 #include "_libelf.h"
36
37 Elf32_Phdr *
elf32_getphdr(Elf * e)38 elf32_getphdr(Elf *e)
39 {
40 return (_libelf_getphdr(e, ELFCLASS32));
41 }
42
43 Elf64_Phdr *
elf64_getphdr(Elf * e)44 elf64_getphdr(Elf *e)
45 {
46 return (_libelf_getphdr(e, ELFCLASS64));
47 }
48
49 GElf_Phdr *
gelf_getphdr(Elf * e,int index,GElf_Phdr * d)50 gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
51 {
52 int ec;
53 Elf32_Ehdr *eh32;
54 Elf64_Ehdr *eh64;
55 Elf32_Phdr *ep32;
56 Elf64_Phdr *ep64;
57
58 if (d == NULL || e == NULL ||
59 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
60 (e->e_kind != ELF_K_ELF) || index < 0) {
61 LIBELF_SET_ERROR(ARGUMENT, 0);
62 return (NULL);
63 }
64
65 if (ec == ELFCLASS32) {
66 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
67 ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
68 return (NULL);
69
70 if (index >= eh32->e_phnum) {
71 LIBELF_SET_ERROR(ARGUMENT, 0);
72 return (NULL);
73 }
74
75 ep32 += index;
76
77 d->p_type = ep32->p_type;
78 d->p_offset = ep32->p_offset;
79 d->p_vaddr = (Elf64_Addr) ep32->p_vaddr;
80 d->p_paddr = (Elf64_Addr) ep32->p_paddr;
81 d->p_filesz = (Elf64_Xword) ep32->p_filesz;
82 d->p_memsz = (Elf64_Xword) ep32->p_memsz;
83 d->p_flags = ep32->p_flags;
84 d->p_align = (Elf64_Xword) ep32->p_align;
85
86 } else {
87 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
88 (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
89 return (NULL);
90
91 if (index >= eh64->e_phnum) {
92 LIBELF_SET_ERROR(ARGUMENT, 0);
93 return (NULL);
94 }
95
96 ep64 += index;
97
98 *d = *ep64;
99 }
100
101 return (d);
102 }
103
104 Elf32_Phdr *
elf32_newphdr(Elf * e,size_t count)105 elf32_newphdr(Elf *e, size_t count)
106 {
107 return (_libelf_newphdr(e, ELFCLASS32, count));
108 }
109
110 Elf64_Phdr *
elf64_newphdr(Elf * e,size_t count)111 elf64_newphdr(Elf *e, size_t count)
112 {
113 return (_libelf_newphdr(e, ELFCLASS64, count));
114 }
115
116 void *
gelf_newphdr(Elf * e,size_t count)117 gelf_newphdr(Elf *e, size_t count)
118 {
119 if (e == NULL) {
120 LIBELF_SET_ERROR(ARGUMENT, 0);
121 return (NULL);
122 }
123 return (_libelf_newphdr(e, e->e_class, count));
124 }
125
126 int
gelf_update_phdr(Elf * e,int ndx,GElf_Phdr * s)127 gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
128 {
129 int ec, phnum;
130 void *ehdr;
131 Elf32_Phdr *ph32;
132 Elf64_Phdr *ph64;
133
134 if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
135 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
136 LIBELF_SET_ERROR(ARGUMENT, 0);
137 return (0);
138 }
139
140 if (e->e_cmd == ELF_C_READ) {
141 LIBELF_SET_ERROR(MODE, 0);
142 return (0);
143 }
144
145 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
146 return (0);
147
148 if (ec == ELFCLASS32)
149 phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
150 else
151 phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
152
153 if (ndx < 0 || ndx > phnum) {
154 LIBELF_SET_ERROR(ARGUMENT, 0);
155 return (0);
156 }
157
158 (void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
159
160 if (ec == ELFCLASS64) {
161 ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
162 *ph64 = *s;
163 return (1);
164 }
165
166 ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
167
168 ph32->p_type = s->p_type;
169 ph32->p_flags = s->p_flags;
170 LIBELF_COPY_U32(ph32, s, p_offset);
171 LIBELF_COPY_U32(ph32, s, p_vaddr);
172 LIBELF_COPY_U32(ph32, s, p_paddr);
173 LIBELF_COPY_U32(ph32, s, p_filesz);
174 LIBELF_COPY_U32(ph32, s, p_memsz);
175 LIBELF_COPY_U32(ph32, s, p_align);
176
177 return (1);
178 }
179