lib/libelf/gelf_ehdr.c

   1 /*-
   2  * Copyright (c) 2006,2008 Joseph Koshy
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28
  29 #include <assert.h>
  30 #include <gelf.h>
  31 #include <libelf.h>
  32 #include <string.h>
  33
  34 #include "_libelf.h"
  35
  36 LIBELF_VCSID("$Id$");
  37
  38 Elf32_Ehdr *
  39 elf32_getehdr(Elf *e)
  40 {
  41         return (_libelf_ehdr(e, ELFCLASS32, 0));
  42 }
  43
  44 Elf64_Ehdr *
  45 elf64_getehdr(Elf *e)
  46 {
  47         return (_libelf_ehdr(e, ELFCLASS64, 0));
  48 }
  49
  50 GElf_Ehdr *
  51 gelf_getehdr(Elf *e, GElf_Ehdr *d)
  52 {
  53         int ec;
  54         Elf32_Ehdr *eh32;
  55         Elf64_Ehdr *eh64;
  56
  57         if (d == NULL || e == NULL ||
  58             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
  59                 LIBELF_SET_ERROR(ARGUMENT, 0);
  60                 return (NULL);
  61         }
  62
  63         if (ec == ELFCLASS32) {
  64                 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
  65                         return (NULL);
  66
  67                 (void) memcpy(d->e_ident, eh32->e_ident, sizeof(eh32->e_ident));
  68                 d->e_type               = eh32->e_type;
  69                 d->e_machine            = eh32->e_machine;
  70                 d->e_version            = eh32->e_version;
  71                 d->e_entry              = eh32->e_entry;
  72                 d->e_phoff              = eh32->e_phoff;
  73                 d->e_shoff              = eh32->e_shoff;
  74                 d->e_flags              = eh32->e_flags;
  75                 d->e_ehsize             = eh32->e_ehsize;
  76                 d->e_phentsize          = eh32->e_phentsize;
  77                 d->e_phnum              = eh32->e_phnum;
  78                 d->e_shentsize          = eh32->e_shentsize;
  79                 d->e_shnum              = eh32->e_shnum;
  80                 d->e_shstrndx           = eh32->e_shstrndx;
  81
  82                 return (d);
  83         }
  84
  85         assert(ec == ELFCLASS64);
  86
  87         if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
  88                 return (NULL);
  89         *d = *eh64;
  90
  91         return (d);
  92 }
  93
  94 Elf32_Ehdr *
  95 elf32_newehdr(Elf *e)
  96 {
  97         return (_libelf_ehdr(e, ELFCLASS32, 1));
  98 }
  99
 100 Elf64_Ehdr *
 101 elf64_newehdr(Elf *e)
 102 {
 103         return (_libelf_ehdr(e, ELFCLASS64, 1));
 104 }
 105
 106 void *
 107 gelf_newehdr(Elf *e, int ec)
 108 {
 109         if (e != NULL &&
 110             (ec == ELFCLASS32 || ec == ELFCLASS64))
 111                 return (_libelf_ehdr(e, ec, 1));
 112
 113         LIBELF_SET_ERROR(ARGUMENT, 0);
 114         return (NULL);
 115 }
 116
 117 int
 118 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
 119 {
 120         int ec;
 121         void *ehdr;
 122         Elf32_Ehdr *eh32;
 123         Elf64_Ehdr *eh64;
 124
 125         if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 126             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 127                 LIBELF_SET_ERROR(ARGUMENT, 0);
 128                 return (0);
 129         }
 130
 131         if (e->e_cmd == ELF_C_READ) {
 132                 LIBELF_SET_ERROR(MODE, 0);
 133                 return (0);
 134         }
 135
 136         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 137                 return (0);
 138
 139         (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
 140
 141         if (ec == ELFCLASS64) {
 142                 eh64 = (Elf64_Ehdr *) ehdr;
 143                 *eh64 = *s;
 144                 return (1);
 145         }
 146
 147         eh32 = (Elf32_Ehdr *) ehdr;
 148
 149         (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
 150
 151         eh32->e_type      = s->e_type;
 152         eh32->e_machine   = s->e_machine;
 153         eh32->e_version   = s->e_version;
 154         LIBELF_COPY_U32(eh32, s, e_entry);
 155         LIBELF_COPY_U32(eh32, s, e_phoff);
 156         LIBELF_COPY_U32(eh32, s, e_shoff);
 157         eh32->e_flags     = s->e_flags;
 158         eh32->e_ehsize    = s->e_ehsize;
 159         eh32->e_phentsize = s->e_phentsize;
 160         eh32->e_phnum     = s->e_phnum;
 161         eh32->e_shentsize = s->e_shentsize;
 162         eh32->e_shnum     = s->e_shnum;
 163         eh32->e_shstrndx  = s->e_shstrndx;
 164
 165         return (1);
 166 }