external/bsd/libelf/dist/gelf_ehdr.c

   1 /*      $NetBSD: gelf_ehdr.c,v 1.2 2009/12/19 06:39:29 thorpej Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2006 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 /* __FBSDID("$FreeBSD: src/lib/libelf/gelf_ehdr.c,v 1.1.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */
  31
  32 #include <assert.h>
  33 #include <limits.h>
  34 #include <gelf.h>
  35 #include <libelf.h>
  36 #include <string.h>
  37
  38 #include "_libelf.h"
  39
  40 Elf32_Ehdr *
  41 elf32_getehdr(Elf *e)
  42 {
  43         return (_libelf_ehdr(e, ELFCLASS32, 0));
  44 }
  45
  46 Elf64_Ehdr *
  47 elf64_getehdr(Elf *e)
  48 {
  49         return (_libelf_ehdr(e, ELFCLASS64, 0));
  50 }
  51
  52 GElf_Ehdr *
  53 gelf_getehdr(Elf *e, GElf_Ehdr *d)
  54 {
  55         int ec;
  56         Elf32_Ehdr *eh32;
  57         Elf64_Ehdr *eh64;
  58
  59         if (d == NULL || e == NULL ||
  60             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
  61                 LIBELF_SET_ERROR(ARGUMENT, 0);
  62                 return (NULL);
  63         }
  64
  65         if (ec == ELFCLASS32) {
  66                 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
  67                         return (NULL);
  68
  69                 (void) memcpy(d->e_ident, eh32->e_ident, sizeof(eh32->e_ident));
  70                 d->e_type               = eh32->e_type;
  71                 d->e_machine            = eh32->e_machine;
  72                 d->e_version            = eh32->e_version;
  73                 d->e_entry              = eh32->e_entry;
  74                 d->e_phoff              = eh32->e_phoff;
  75                 d->e_shoff              = eh32->e_shoff;
  76                 d->e_flags              = eh32->e_flags;
  77                 d->e_ehsize             = eh32->e_ehsize;
  78                 d->e_phentsize          = eh32->e_phentsize;
  79                 d->e_phnum              = eh32->e_phnum;
  80                 d->e_shentsize          = eh32->e_shentsize;
  81                 d->e_shnum              = eh32->e_shnum;
  82                 d->e_shstrndx           = eh32->e_shstrndx;
  83
  84                 return (d);
  85         }
  86
  87         assert(ec == ELFCLASS64);
  88
  89         if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
  90                 return (NULL);
  91         *d = *eh64;
  92
  93         return (d);
  94 }
  95
  96 Elf32_Ehdr *
  97 elf32_newehdr(Elf *e)
  98 {
  99         return (_libelf_ehdr(e, ELFCLASS32, 1));
 100 }
 101
 102 Elf64_Ehdr *
 103 elf64_newehdr(Elf *e)
 104 {
 105         return (_libelf_ehdr(e, ELFCLASS64, 1));
 106 }
 107
 108 void *
 109 gelf_newehdr(Elf *e, int ec)
 110 {
 111         if (e != NULL &&
 112             (ec == ELFCLASS32 || ec == ELFCLASS64))
 113                 return (_libelf_ehdr(e, ec, 1));
 114
 115         LIBELF_SET_ERROR(ARGUMENT, 0);
 116         return (NULL);
 117 }
 118
 119 int
 120 gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
 121 {
 122         int ec;
 123         void *ehdr;
 124         Elf32_Ehdr *eh32;
 125         Elf64_Ehdr *eh64;
 126
 127         if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 128             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 129                 LIBELF_SET_ERROR(ARGUMENT, 0);
 130                 return (0);
 131         }
 132
 133         if (e->e_cmd == ELF_C_READ) {
 134                 LIBELF_SET_ERROR(MODE, 0);
 135                 return (0);
 136         }
 137
 138         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 139                 return (0);
 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         (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);
 166
 167         return (1);
 168 }