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

   1 /*      $NetBSD: gelf_ehdr.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 #if HAVE_NBTOOL_CONFIG_H
  30 # include "nbtool_config.h"
  31 #endif
  32
  33 #include <sys/cdefs.h>
  34
  35 #include <assert.h>
  36 #include <gelf.h>
  37 #include <libelf.h>
  38 #include <limits.h>
  39 #include <string.h>
  40
  41 #include "_libelf.h"
  42
  43 __RCSID("$NetBSD: gelf_ehdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  44 ELFTC_VCSID("Id: gelf_ehdr.c 2268 2011-12-03 17:05:11Z jkoshy ");
  45
  46 Elf32_Ehdr *
  47 elf32_getehdr(Elf *e)
  48 {
  49         return (_libelf_ehdr(e, ELFCLASS32, 0));
  50 }
  51
  52 Elf64_Ehdr *
  53 elf64_getehdr(Elf *e)
  54 {
  55         return (_libelf_ehdr(e, ELFCLASS64, 0));
  56 }
  57
  58 GElf_Ehdr *
  59 gelf_getehdr(Elf *e, GElf_Ehdr *d)
  60 {
  61         int ec;
  62         Elf32_Ehdr *eh32;
  63         Elf64_Ehdr *eh64;
  64
  65         if (d == NULL || e == NULL ||
  66             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
  67                 LIBELF_SET_ERROR(ARGUMENT, 0);
  68                 return (NULL);
  69         }
  70
  71         if (ec == ELFCLASS32) {
  72                 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
  73                         return (NULL);
  74
  75                 (void) memcpy(d->e_ident, eh32->e_ident,
  76                     sizeof(eh32->e_ident));
  77                 d->e_type               = eh32->e_type;
  78                 d->e_machine            = eh32->e_machine;
  79                 d->e_version            = eh32->e_version;
  80                 d->e_entry              = eh32->e_entry;
  81                 d->e_phoff              = eh32->e_phoff;
  82                 d->e_shoff              = eh32->e_shoff;
  83                 d->e_flags              = eh32->e_flags;
  84                 d->e_ehsize             = eh32->e_ehsize;
  85                 d->e_phentsize          = eh32->e_phentsize;
  86                 d->e_phnum              = eh32->e_phnum;
  87                 d->e_shentsize          = eh32->e_shentsize;
  88                 d->e_shnum              = eh32->e_shnum;
  89                 d->e_shstrndx           = eh32->e_shstrndx;
  90
  91                 return (d);
  92         }
  93
  94         assert(ec == ELFCLASS64);
  95
  96         if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
  97                 return (NULL);
  98         *d = *eh64;
  99
 100         return (d);
 101 }
 102
 103 Elf32_Ehdr *
 104 elf32_newehdr(Elf *e)
 105 {
 106         return (_libelf_ehdr(e, ELFCLASS32, 1));
 107 }
 108
 109 Elf64_Ehdr *
 110 elf64_newehdr(Elf *e)
 111 {
 112         return (_libelf_ehdr(e, ELFCLASS64, 1));
 113 }
 114
 115 void *
 116 gelf_newehdr(Elf *e, int ec)
 117 {
 118         if (e != NULL &&
 119             (ec == ELFCLASS32 || ec == ELFCLASS64))
 120                 return (_libelf_ehdr(e, ec, 1));
 121
 122         LIBELF_SET_ERROR(ARGUMENT, 0);
 123         return (NULL);
 124 }
 125
 126 int
 127 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
 128 {
 129         int ec;
 130         void *ehdr;
 131         Elf32_Ehdr *eh32;
 132         Elf64_Ehdr *eh64;
 133
 134         if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 135             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 136                 LIBELF_SET_ERROR(ARGUMENT, 0);
 137                 return (0);
 138         }
 139
 140         if (e->e_cmd == ELF_C_READ) {
 141                 LIBELF_SET_ERROR(MODE, 0);
 142                 return (0);
 143         }
 144
 145         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 146                 return (0);
 147
 148         (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
 149
 150         if (ec == ELFCLASS64) {
 151                 eh64 = (Elf64_Ehdr *) ehdr;
 152                 *eh64 = *s;
 153                 return (1);
 154         }
 155
 156         eh32 = (Elf32_Ehdr *) ehdr;
 157
 158         (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
 159
 160         eh32->e_type      = s->e_type;
 161         eh32->e_machine   = s->e_machine;
 162         eh32->e_version   = s->e_version;
 163         LIBELF_COPY_U32(eh32, s, e_entry);
 164         LIBELF_COPY_U32(eh32, s, e_phoff);
 165         LIBELF_COPY_U32(eh32, s, e_shoff);
 166         eh32->e_flags     = s->e_flags;
 167         eh32->e_ehsize    = s->e_ehsize;
 168         eh32->e_phentsize = s->e_phentsize;
 169         eh32->e_phnum     = s->e_phnum;
 170         eh32->e_shentsize = s->e_shentsize;
 171         eh32->e_shnum     = s->e_shnum;
 172         eh32->e_shstrndx  = s->e_shstrndx;
 173
 174         return (1);
 175 }