1 /* Return program header table entry.
2 Copyright (C) 1998-2010 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 1998.
5
6 Red Hat elfutils is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by the
8 Free Software Foundation; version 2 of the License.
9
10 Red Hat elfutils is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License along
16 with Red Hat elfutils; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18
19 In addition, as a special exception, Red Hat, Inc. gives You the
20 additional right to link the code of Red Hat elfutils with code licensed
21 under any Open Source Initiative certified open source license
22 (http://www.opensource.org/licenses/index.php) which requires the
23 distribution of source code with any binary distribution and to
24 distribute linked combinations of the two. Non-GPL Code permitted under
25 this exception must only link to the code of Red Hat elfutils through
26 those well defined interfaces identified in the file named EXCEPTION
27 found in the source code files (the "Approved Interfaces"). The files
28 of Non-GPL Code may instantiate templates or use macros or inline
29 functions from the Approved Interfaces without causing the resulting
30 work to be covered by the GNU General Public License. Only Red Hat,
31 Inc. may make changes or additions to the list of Approved Interfaces.
32 Red Hat's grant of this exception is conditioned upon your not adding
33 any new exceptions. If you wish to add a new Approved Interface or
34 exception, please contact Red Hat. You must obey the GNU General Public
35 License in all respects for all of the Red Hat elfutils code and other
36 code used in conjunction with Red Hat elfutils except the Non-GPL Code
37 covered by this exception. If you modify this file, you may extend this
38 exception to your version of the file, but you are not obligated to do
39 so. If you do not wish to provide this exception without modification,
40 you must delete this exception statement from your version and license
41 this file solely under the GPL without exception.
42
43 Red Hat elfutils is an included package of the Open Invention Network.
44 An included package of the Open Invention Network is a package for which
45 Open Invention Network licensees cross-license their patents. No patent
46 license is granted, either expressly or impliedly, by designation as an
47 included package. Should you wish to participate in the Open Invention
48 Network licensing program, please visit www.openinventionnetwork.com
49 <http://www.openinventionnetwork.com>. */
50
51 #ifdef HAVE_CONFIG_H
52 # include <config.h>
53 #endif
54
55 #include <gelf.h>
56 #include <string.h>
57 #include <stdbool.h>
58
59 #include "libelfP.h"
60
61
62 GElf_Phdr *
gelf_getphdr(elf,ndx,dst)63 gelf_getphdr (elf, ndx, dst)
64 Elf *elf;
65 int ndx;
66 GElf_Phdr *dst;
67 {
68 GElf_Phdr *result = NULL;
69
70 if (elf == NULL)
71 return NULL;
72
73 if (unlikely (elf->kind != ELF_K_ELF))
74 {
75 __libelf_seterrno (ELF_E_INVALID_HANDLE);
76 return NULL;
77 }
78
79 if (dst == NULL)
80 {
81 __libelf_seterrno (ELF_E_INVALID_OPERAND);
82 return NULL;
83 }
84
85 rwlock_rdlock (elf->lock);
86
87 if (elf->class == ELFCLASS32)
88 {
89 /* Copy the elements one-by-one. */
90 Elf32_Phdr *phdr = elf->state.elf32.phdr;
91
92 if (phdr == NULL)
93 {
94 rwlock_unlock (elf->lock);
95 phdr = INTUSE(elf32_getphdr) (elf);
96 if (phdr == NULL)
97 /* The error number is already set. */
98 return NULL;
99 rwlock_rdlock (elf->lock);
100 }
101
102 /* Test whether the index is ok. */
103 size_t phnum;
104 if (ndx >= elf->state.elf32.ehdr->e_phnum
105 && (elf->state.elf32.ehdr->e_phnum != PN_XNUM
106 || __elf_getphdrnum_rdlock (elf, &phnum) != 0
107 || (size_t) ndx >= phnum))
108 {
109 __libelf_seterrno (ELF_E_INVALID_INDEX);
110 goto out;
111 }
112
113 /* We know the result now. */
114 result = dst;
115
116 /* Now correct the pointer to point to the correct element. */
117 phdr += ndx;
118
119 #define COPY(Name) result->Name = phdr->Name
120 COPY (p_type);
121 COPY (p_offset);
122 COPY (p_vaddr);
123 COPY (p_paddr);
124 COPY (p_filesz);
125 COPY (p_memsz);
126 COPY (p_flags);
127 COPY (p_align);
128 }
129 else
130 {
131 /* Copy the elements one-by-one. */
132 Elf64_Phdr *phdr = elf->state.elf64.phdr;
133
134 if (phdr == NULL)
135 {
136 rwlock_unlock (elf->lock);
137 phdr = INTUSE(elf64_getphdr) (elf);
138 if (phdr == NULL)
139 /* The error number is already set. */
140 return NULL;
141 rwlock_rdlock (elf->lock);
142 }
143
144 /* Test whether the index is ok. */
145 size_t phnum;
146 if (ndx >= elf->state.elf64.ehdr->e_phnum
147 && (elf->state.elf64.ehdr->e_phnum != PN_XNUM
148 || __elf_getphdrnum_rdlock (elf, &phnum) != 0
149 || (size_t) ndx >= phnum))
150 {
151 __libelf_seterrno (ELF_E_INVALID_INDEX);
152 goto out;
153 }
154
155 /* We only have to copy the data. */
156 result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr));
157 }
158
159 out:
160 rwlock_unlock (elf->lock);
161
162 return result;
163 }
164