ext/libelf/gelf_ehdr.c

   1 /*-
   2  * Copyright (c) 2006 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 <limits.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 Elf32_Ehdr *
  37 elf32_getehdr(Elf *e)
  38 {
  39         return (_libelf_ehdr(e, ELFCLASS32, 0));
  40 }
  41
  42 Elf64_Ehdr *
  43 elf64_getehdr(Elf *e)
  44 {
  45         return (_libelf_ehdr(e, ELFCLASS64, 0));
  46 }
  47
  48 GElf_Ehdr *
  49 gelf_getehdr(Elf *e, GElf_Ehdr *d)
  50 {
  51         int ec;
  52         Elf32_Ehdr *eh32;
  53         Elf64_Ehdr *eh64;
  54
  55         if (d == NULL || e == NULL ||
  56             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
  57                 LIBELF_SET_ERROR(ARGUMENT, 0);
  58                 return (NULL);
  59         }
  60
  61         if (ec == ELFCLASS32) {
  62                 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
  63                         return (NULL);
  64
  65                 (void) memcpy(d->e_ident, eh32->e_ident, sizeof(eh32->e_ident));
  66                 d->e_type               = eh32->e_type;
  67                 d->e_machine            = eh32->e_machine;
  68                 d->e_version            = eh32->e_version;
  69                 d->e_entry              = eh32->e_entry;
  70                 d->e_phoff              = eh32->e_phoff;
  71                 d->e_shoff              = eh32->e_shoff;
  72                 d->e_flags              = eh32->e_flags;
  73                 d->e_ehsize             = eh32->e_ehsize;
  74                 d->e_phentsize          = eh32->e_phentsize;
  75                 d->e_phnum              = eh32->e_phnum;
  76                 d->e_shentsize          = eh32->e_shentsize;
  77                 d->e_shnum              = eh32->e_shnum;
  78                 d->e_shstrndx           = eh32->e_shstrndx;
  79
  80                 return (d);
  81         }
  82
  83         assert(ec == ELFCLASS64);
  84
  85         if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
  86                 return (NULL);
  87         *d = *eh64;
  88
  89         return (d);
  90 }
  91
  92 Elf32_Ehdr *
  93 elf32_newehdr(Elf *e)
  94 {
  95         return (_libelf_ehdr(e, ELFCLASS32, 1));
  96 }
  97
  98 Elf64_Ehdr *
  99 elf64_newehdr(Elf *e)
 100 {
 101         return (_libelf_ehdr(e, ELFCLASS64, 1));
 102 }
 103
 104 void *
 105 gelf_newehdr(Elf *e, int ec)
 106 {
 107         if (e != NULL &&
 108             (ec == ELFCLASS32 || ec == ELFCLASS64))
 109                 return (_libelf_ehdr(e, ec, 1));
 110
 111         LIBELF_SET_ERROR(ARGUMENT, 0);
 112         return (NULL);
 113 }
 114
 115 int
 116 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
 117 {
 118         int ec;
 119         void *ehdr;
 120         Elf32_Ehdr *eh32;
 121         Elf64_Ehdr *eh64;
 122
 123         if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 124             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 125                 LIBELF_SET_ERROR(ARGUMENT, 0);
 126                 return (0);
 127         }
 128
 129         if (e->e_cmd == ELF_C_READ) {
 130                 LIBELF_SET_ERROR(MODE, 0);
 131                 return (0);
 132         }
 133
 134         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 135                 return (0);
 136
 137         if (ec == ELFCLASS64) {
 138                 eh64 = (Elf64_Ehdr *) ehdr;
 139                 *eh64 = *s;
 140                 return (1);
 141         }
 142
 143         eh32 = (Elf32_Ehdr *) ehdr;
 144
 145         (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
 146
 147         eh32->e_type      = s->e_type;
 148         eh32->e_machine   = s->e_machine;
 149         eh32->e_version   = s->e_version;
 150         LIBELF_COPY_U32(eh32, s, e_entry);
 151         LIBELF_COPY_U32(eh32, s, e_phoff);
 152         LIBELF_COPY_U32(eh32, s, e_shoff);
 153         eh32->e_flags     = s->e_flags;
 154         eh32->e_ehsize    = s->e_ehsize;
 155         eh32->e_phentsize = s->e_phentsize;
 156         eh32->e_phnum     = s->e_phnum;
 157         eh32->e_shentsize = s->e_shentsize;
 158         eh32->e_shnum     = s->e_shnum;
 159         eh32->e_shstrndx  = s->e_shstrndx;
 160
 161         (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
 162
 163         return (1);
 164 }