1 /* $NetBSD: gelf_phdr.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 #include <sys/cdefs.h> 30 31 #include <gelf.h> 32 #include <libelf.h> 33 #include <limits.h> 34 35 #include "_libelf.h" 36 37 __RCSID("$NetBSD: gelf_phdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $"); 38 ELFTC_VCSID("Id: gelf_phdr.c 2268 2011-12-03 17:05:11Z jkoshy "); 39 40 Elf32_Phdr * 41 elf32_getphdr(Elf *e) 42 { 43 return (_libelf_getphdr(e, ELFCLASS32)); 44 } 45 46 Elf64_Phdr * 47 elf64_getphdr(Elf *e) 48 { 49 return (_libelf_getphdr(e, ELFCLASS64)); 50 } 51 52 GElf_Phdr * 53 gelf_getphdr(Elf *e, int index, GElf_Phdr *d) 54 { 55 int ec; 56 Elf32_Ehdr *eh32; 57 Elf64_Ehdr *eh64; 58 Elf32_Phdr *ep32; 59 Elf64_Phdr *ep64; 60 61 if (d == NULL || e == NULL || 62 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) || 63 (e->e_kind != ELF_K_ELF) || index < 0) { 64 LIBELF_SET_ERROR(ARGUMENT, 0); 65 return (NULL); 66 } 67 68 if (ec == ELFCLASS32) { 69 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL || 70 ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL)) 71 return (NULL); 72 73 if (index >= eh32->e_phnum) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 ep32 += index; 79 80 d->p_type = ep32->p_type; 81 d->p_offset = ep32->p_offset; 82 d->p_vaddr = (Elf64_Addr) ep32->p_vaddr; 83 d->p_paddr = (Elf64_Addr) ep32->p_paddr; 84 d->p_filesz = (Elf64_Xword) ep32->p_filesz; 85 d->p_memsz = (Elf64_Xword) ep32->p_memsz; 86 d->p_flags = ep32->p_flags; 87 d->p_align = (Elf64_Xword) ep32->p_align; 88 89 } else { 90 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL || 91 (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL) 92 return (NULL); 93 94 if (index >= eh64->e_phnum) { 95 LIBELF_SET_ERROR(ARGUMENT, 0); 96 return (NULL); 97 } 98 99 ep64 += index; 100 101 *d = *ep64; 102 } 103 104 return (d); 105 } 106 107 Elf32_Phdr * 108 elf32_newphdr(Elf *e, size_t count) 109 { 110 return (_libelf_newphdr(e, ELFCLASS32, count)); 111 } 112 113 Elf64_Phdr * 114 elf64_newphdr(Elf *e, size_t count) 115 { 116 return (_libelf_newphdr(e, ELFCLASS64, count)); 117 } 118 119 void * 120 gelf_newphdr(Elf *e, size_t count) 121 { 122 if (e == NULL) { 123 LIBELF_SET_ERROR(ARGUMENT, 0); 124 return (NULL); 125 } 126 return (_libelf_newphdr(e, e->e_class, count)); 127 } 128 129 int 130 gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s) 131 { 132 int ec, phnum; 133 void *ehdr; 134 Elf32_Phdr *ph32; 135 Elf64_Phdr *ph64; 136 137 if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF || 138 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 139 LIBELF_SET_ERROR(ARGUMENT, 0); 140 return (0); 141 } 142 143 if (e->e_cmd == ELF_C_READ) { 144 LIBELF_SET_ERROR(MODE, 0); 145 return (0); 146 } 147 148 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) 149 return (0); 150 151 if (ec == ELFCLASS32) 152 phnum = ((Elf32_Ehdr *) ehdr)->e_phnum; 153 else 154 phnum = ((Elf64_Ehdr *) ehdr)->e_phnum; 155 156 if (ndx < 0 || ndx > phnum) { 157 LIBELF_SET_ERROR(ARGUMENT, 0); 158 return (0); 159 } 160 161 (void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY); 162 163 if (ec == ELFCLASS64) { 164 ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx; 165 *ph64 = *s; 166 return (1); 167 } 168 169 ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx; 170 171 ph32->p_type = s->p_type; 172 ph32->p_flags = s->p_flags; 173 LIBELF_COPY_U32(ph32, s, p_offset); 174 LIBELF_COPY_U32(ph32, s, p_vaddr); 175 LIBELF_COPY_U32(ph32, s, p_paddr); 176 LIBELF_COPY_U32(ph32, s, p_filesz); 177 LIBELF_COPY_U32(ph32, s, p_memsz); 178 LIBELF_COPY_U32(ph32, s, p_align); 179 180 return (1); 181 } 182