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