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b08d5a8f | 1 | /* Return program header table entry. |
1ccdfb68 | 2 | Copyright (C) 1998-2010, 2015 Red Hat, Inc. |
de2ed97f | 3 | This file is part of elfutils. |
b08d5a8f UD |
4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
5 | ||
de2ed97f MW |
6 | This file is free software; you can redistribute it and/or modify |
7 | it under the terms of either | |
b08d5a8f | 8 | |
de2ed97f MW |
9 | * the GNU Lesser General Public License as published by the Free |
10 | Software Foundation; either version 3 of the License, or (at | |
11 | your option) any later version | |
12 | ||
13 | or | |
14 | ||
15 | * the GNU General Public License as published by the Free | |
16 | Software Foundation; either version 2 of the License, or (at | |
17 | your option) any later version | |
18 | ||
19 | or both in parallel, as here. | |
20 | ||
21 | elfutils is distributed in the hope that it will be useful, but | |
361df7da UD |
22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
24 | General Public License for more details. | |
b08d5a8f | 25 | |
de2ed97f MW |
26 | You should have received copies of the GNU General Public License and |
27 | the GNU Lesser General Public License along with this program. If | |
28 | not, see <http://www.gnu.org/licenses/>. */ | |
b08d5a8f UD |
29 | |
30 | #ifdef HAVE_CONFIG_H | |
31 | # include <config.h> | |
32 | #endif | |
33 | ||
34 | #include <gelf.h> | |
35 | #include <string.h> | |
b4d6f0f8 | 36 | #include <stdbool.h> |
b08d5a8f UD |
37 | |
38 | #include "libelfP.h" | |
39 | ||
40 | ||
41 | GElf_Phdr * | |
1ccdfb68 | 42 | gelf_getphdr (Elf *elf, int ndx, GElf_Phdr *dst) |
b08d5a8f UD |
43 | { |
44 | GElf_Phdr *result = NULL; | |
45 | ||
46 | if (elf == NULL) | |
47 | return NULL; | |
48 | ||
49 | if (unlikely (elf->kind != ELF_K_ELF)) | |
50 | { | |
51 | __libelf_seterrno (ELF_E_INVALID_HANDLE); | |
52 | return NULL; | |
53 | } | |
54 | ||
55 | if (dst == NULL) | |
56 | { | |
57 | __libelf_seterrno (ELF_E_INVALID_OPERAND); | |
58 | return NULL; | |
59 | } | |
60 | ||
b4d6f0f8 | 61 | rwlock_rdlock (elf->lock); |
b08d5a8f UD |
62 | |
63 | if (elf->class == ELFCLASS32) | |
64 | { | |
65 | /* Copy the elements one-by-one. */ | |
66 | Elf32_Phdr *phdr = elf->state.elf32.phdr; | |
67 | ||
68 | if (phdr == NULL) | |
69 | { | |
b4d6f0f8 RM |
70 | rwlock_unlock (elf->lock); |
71 | phdr = INTUSE(elf32_getphdr) (elf); | |
b08d5a8f UD |
72 | if (phdr == NULL) |
73 | /* The error number is already set. */ | |
b4d6f0f8 RM |
74 | return NULL; |
75 | rwlock_rdlock (elf->lock); | |
b08d5a8f UD |
76 | } |
77 | ||
78 | /* Test whether the index is ok. */ | |
6fd3cd10 | 79 | size_t phnum; |
cc62e378 MW |
80 | if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0 |
81 | || (size_t) ndx >= phnum) | |
b08d5a8f UD |
82 | { |
83 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
84 | goto out; | |
85 | } | |
86 | ||
87 | /* We know the result now. */ | |
88 | result = dst; | |
89 | ||
90 | /* Now correct the pointer to point to the correct element. */ | |
91 | phdr += ndx; | |
92 | ||
93 | #define COPY(Name) result->Name = phdr->Name | |
94 | COPY (p_type); | |
95 | COPY (p_offset); | |
96 | COPY (p_vaddr); | |
97 | COPY (p_paddr); | |
98 | COPY (p_filesz); | |
99 | COPY (p_memsz); | |
100 | COPY (p_flags); | |
101 | COPY (p_align); | |
102 | } | |
103 | else | |
104 | { | |
105 | /* Copy the elements one-by-one. */ | |
106 | Elf64_Phdr *phdr = elf->state.elf64.phdr; | |
107 | ||
108 | if (phdr == NULL) | |
109 | { | |
b4d6f0f8 RM |
110 | rwlock_unlock (elf->lock); |
111 | phdr = INTUSE(elf64_getphdr) (elf); | |
b08d5a8f UD |
112 | if (phdr == NULL) |
113 | /* The error number is already set. */ | |
b4d6f0f8 RM |
114 | return NULL; |
115 | rwlock_rdlock (elf->lock); | |
b08d5a8f UD |
116 | } |
117 | ||
118 | /* Test whether the index is ok. */ | |
6fd3cd10 | 119 | size_t phnum; |
cc62e378 MW |
120 | if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0 |
121 | || (size_t) ndx >= phnum) | |
b08d5a8f UD |
122 | { |
123 | __libelf_seterrno (ELF_E_INVALID_INDEX); | |
124 | goto out; | |
125 | } | |
126 | ||
127 | /* We only have to copy the data. */ | |
128 | result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr)); | |
129 | } | |
130 | ||
131 | out: | |
b4d6f0f8 | 132 | rwlock_unlock (elf->lock); |
b08d5a8f UD |
133 | |
134 | return result; | |
135 | } |