external/bsd/elftoolchain/dist/libelf/gelf_phdr.c

   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 }