1 /* Return program header table entry. 2 Copyright (C) 1998-2010, 2015 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 1998. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 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 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. 25 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/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <gelf.h> 35 #include <string.h> 36 #include <stdbool.h> 37 38 #include "libelfP.h" 39 40 41 GElf_Phdr * 42 gelf_getphdr (Elf *elf, int ndx, GElf_Phdr *dst) 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 61 rwlock_rdlock (elf->lock); 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 { 70 rwlock_unlock (elf->lock); 71 phdr = INTUSE(elf32_getphdr) (elf); 72 if (phdr == NULL) 73 /* The error number is already set. */ 74 return NULL; 75 rwlock_rdlock (elf->lock); 76 } 77 78 /* Test whether the index is ok. */ 79 size_t phnum; 80 if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0 81 || (size_t) ndx >= phnum) 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 { 110 rwlock_unlock (elf->lock); 111 phdr = INTUSE(elf64_getphdr) (elf); 112 if (phdr == NULL) 113 /* The error number is already set. */ 114 return NULL; 115 rwlock_rdlock (elf->lock); 116 } 117 118 /* Test whether the index is ok. */ 119 size_t phnum; 120 if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0 121 || (size_t) ndx >= phnum) 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: 132 rwlock_unlock (elf->lock); 133 134 return result; 135 } 136
