lib/libelf/gelf_shdr.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
  33 #include "_libelf.h"
  34
  35 LIBELF_VCSID("$Id$");
  36
  37 Elf32_Shdr *
  38 elf32_getshdr(Elf_Scn *s)
  39 {
  40         return (_libelf_getshdr(s, ELFCLASS32));
  41 }
  42
  43 Elf64_Shdr *
  44 elf64_getshdr(Elf_Scn *s)
  45 {
  46         return (_libelf_getshdr(s, ELFCLASS64));
  47 }
  48
  49 GElf_Shdr *
  50 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
  51 {
  52         int ec;
  53         void *sh;
  54         Elf32_Shdr *sh32;
  55         Elf64_Shdr *sh64;
  56
  57         if (d == NULL) {
  58                 LIBELF_SET_ERROR(ARGUMENT, 0);
  59                 return (NULL);
  60         }
  61
  62         if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
  63                 return (NULL);
  64
  65         ec = s->s_elf->e_class;
  66         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  67
  68         if (ec == ELFCLASS32) {
  69                 sh32 = (Elf32_Shdr *) sh;
  70
  71                 d->sh_name      = sh32->sh_name;
  72                 d->sh_type      = sh32->sh_type;
  73                 d->sh_flags     = (Elf64_Xword) sh32->sh_flags;
  74                 d->sh_addr      = (Elf64_Addr) sh32->sh_addr;
  75                 d->sh_offset    = (Elf64_Off) sh32->sh_offset;
  76                 d->sh_size      = (Elf64_Xword) sh32->sh_size;
  77                 d->sh_link      = sh32->sh_link;
  78                 d->sh_info      = sh32->sh_info;
  79                 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
  80                 d->sh_entsize   = (Elf64_Xword) sh32->sh_entsize;
  81         } else {
  82                 sh64 = (Elf64_Shdr *) sh;
  83                 *d = *sh64;
  84         }
  85
  86         return (d);
  87 }
  88
  89 int
  90 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
  91 {
  92         int ec;
  93         Elf *e;
  94         Elf32_Shdr *sh32;
  95
  96
  97         if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
  98             e->e_kind != ELF_K_ELF ||
  99             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 100                 LIBELF_SET_ERROR(ARGUMENT, 0);
 101                 return (0);
 102         }
 103
 104         if (e->e_cmd == ELF_C_READ) {
 105                 LIBELF_SET_ERROR(MODE, 0);
 106                 return (0);
 107         }
 108
 109         (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
 110
 111         if (ec == ELFCLASS64) {
 112                 scn->s_shdr.s_shdr64 = *s;
 113                 return (1);
 114         }
 115
 116         sh32 = &scn->s_shdr.s_shdr32;
 117
 118         sh32->sh_name    =  s->sh_name;
 119         sh32->sh_type    =  s->sh_type;
 120         LIBELF_COPY_U32(sh32, s, sh_flags);
 121         LIBELF_COPY_U32(sh32, s, sh_addr);
 122         LIBELF_COPY_U32(sh32, s, sh_offset);
 123         LIBELF_COPY_U32(sh32, s, sh_size);
 124         sh32->sh_link    =  s->sh_link;
 125         sh32->sh_info    =  s->sh_info;
 126         LIBELF_COPY_U32(sh32, s, sh_addralign);
 127         LIBELF_COPY_U32(sh32, s, sh_entsize);
 128
 129         return (1);
 130 }