contrib/elftoolchain/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 <assert.h>
  28 #include <gelf.h>
  29 #include <libelf.h>
  30 #include <limits.h>
  31 #include <stdint.h>
  32 #include <string.h>
  33
  34 #include "_libelf.h"
  35
  36 ELFTC_VCSID("$Id: gelf_ehdr.c 3177 2015-03-30 18:19:41Z emaste $");
  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,
  68                     sizeof(eh32->e_ident));
  69                 d->e_type               = eh32->e_type;
  70                 d->e_machine            = eh32->e_machine;
  71                 d->e_version            = eh32->e_version;
  72                 d->e_entry              = eh32->e_entry;
  73                 d->e_phoff              = eh32->e_phoff;
  74                 d->e_shoff              = eh32->e_shoff;
  75                 d->e_flags              = eh32->e_flags;
  76                 d->e_ehsize             = eh32->e_ehsize;
  77                 d->e_phentsize          = eh32->e_phentsize;
  78                 d->e_phnum              = eh32->e_phnum;
  79                 d->e_shentsize          = eh32->e_shentsize;
  80                 d->e_shnum              = eh32->e_shnum;
  81                 d->e_shstrndx           = eh32->e_shstrndx;
  82
  83                 return (d);
  84         }
  85
  86         assert(ec == ELFCLASS64);
  87
  88         if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
  89                 return (NULL);
  90         *d = *eh64;
  91
  92         return (d);
  93 }
  94
  95 Elf32_Ehdr *
  96 elf32_newehdr(Elf *e)
  97 {
  98         return (_libelf_ehdr(e, ELFCLASS32, 1));
  99 }
 100
 101 Elf64_Ehdr *
 102 elf64_newehdr(Elf *e)
 103 {
 104         return (_libelf_ehdr(e, ELFCLASS64, 1));
 105 }
 106
 107 void *
 108 gelf_newehdr(Elf *e, int ec)
 109 {
 110         if (e != NULL &&
 111             (ec == ELFCLASS32 || ec == ELFCLASS64))
 112                 return (_libelf_ehdr(e, ec, 1));
 113
 114         LIBELF_SET_ERROR(ARGUMENT, 0);
 115         return (NULL);
 116 }
 117
 118 int
 119 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
 120 {
 121         int ec;
 122         void *ehdr;
 123         Elf32_Ehdr *eh32;
 124         Elf64_Ehdr *eh64;
 125
 126         if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 127             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 128                 LIBELF_SET_ERROR(ARGUMENT, 0);
 129                 return (0);
 130         }
 131
 132         if (e->e_cmd == ELF_C_READ) {
 133                 LIBELF_SET_ERROR(MODE, 0);
 134                 return (0);
 135         }
 136
 137         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 138                 return (0);
 139
 140         (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
 141
 142         if (ec == ELFCLASS64) {
 143                 eh64 = (Elf64_Ehdr *) ehdr;
 144                 *eh64 = *s;
 145                 return (1);
 146         }
 147
 148         eh32 = (Elf32_Ehdr *) ehdr;
 149
 150         (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));
 151
 152         eh32->e_type      = s->e_type;
 153         eh32->e_machine   = s->e_machine;
 154         eh32->e_version   = s->e_version;
 155         LIBELF_COPY_U32(eh32, s, e_entry);
 156         LIBELF_COPY_U32(eh32, s, e_phoff);
 157         LIBELF_COPY_U32(eh32, s, e_shoff);
 158         eh32->e_flags     = s->e_flags;
 159         eh32->e_ehsize    = s->e_ehsize;
 160         eh32->e_phentsize = s->e_phentsize;
 161         eh32->e_phnum     = s->e_phnum;
 162         eh32->e_shentsize = s->e_shentsize;
 163         eh32->e_shnum     = s->e_shnum;
 164         eh32->e_shstrndx  = s->e_shstrndx;
 165
 166         return (1);
 167 }