external/bsd/elftoolchain/dist/libelf/gelf_rela.c

   1 /*      $NetBSD: gelf_rela.c,v 1.2 2014/03/09 16:58:04 christos Exp $   */
   2
   3 /*-
   4  * Copyright (c) 2006,2008 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 #if HAVE_NBTOOL_CONFIG_H
  30 # include "nbtool_config.h"
  31 #endif
  32
  33 #include <sys/cdefs.h>
  34
  35 #include <assert.h>
  36 #include <gelf.h>
  37 #include <limits.h>
  38
  39 #include "_libelf.h"
  40
  41 __RCSID("$NetBSD: gelf_rela.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  42 ELFTC_VCSID("Id: gelf_rela.c 2272 2011-12-03 17:07:31Z jkoshy ");
  43
  44 GElf_Rela *
  45 gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst)
  46 {
  47         int ec;
  48         Elf *e;
  49         size_t msz;
  50         Elf_Scn *scn;
  51         uint32_t sh_type;
  52         Elf32_Rela *rela32;
  53         Elf64_Rela *rela64;
  54         struct _Libelf_Data *d;
  55
  56         d = (struct _Libelf_Data *) ed;
  57
  58         if (d == NULL || ndx < 0 || dst == NULL ||
  59             (scn = d->d_scn) == NULL ||
  60             (e = scn->s_elf) == NULL) {
  61                 LIBELF_SET_ERROR(ARGUMENT, 0);
  62                 return (NULL);
  63         }
  64
  65         ec = e->e_class;
  66         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  67
  68         if (ec == ELFCLASS32)
  69                 sh_type = scn->s_shdr.s_shdr32.sh_type;
  70         else
  71                 sh_type = scn->s_shdr.s_shdr64.sh_type;
  72
  73         if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
  74                 LIBELF_SET_ERROR(ARGUMENT, 0);
  75                 return (NULL);
  76         }
  77
  78         msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
  79
  80         assert(msz > 0);
  81
  82         if (msz * ndx >= d->d_data.d_size) {
  83                 LIBELF_SET_ERROR(ARGUMENT, 0);
  84                 return (NULL);
  85         }
  86
  87         if (ec == ELFCLASS32) {
  88                 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
  89
  90                 dst->r_offset = (Elf64_Addr) rela32->r_offset;
  91                 dst->r_info   = ELF64_R_INFO(
  92                     (Elf64_Xword) ELF32_R_SYM(rela32->r_info),
  93                     ELF32_R_TYPE(rela32->r_info));
  94                 dst->r_addend = (Elf64_Sxword) rela32->r_addend;
  95
  96         } else {
  97
  98                 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
  99
 100                 *dst = *rela64;
 101         }
 102
 103         return (dst);
 104 }
 105
 106 int
 107 gelf_update_rela(Elf_Data *ed, int ndx, GElf_Rela *dr)
 108 {
 109         int ec;
 110         Elf *e;
 111         size_t msz;
 112         Elf_Scn *scn;
 113         uint32_t sh_type;
 114         Elf32_Rela *rela32;
 115         Elf64_Rela *rela64;
 116         struct _Libelf_Data *d;
 117
 118         d = (struct _Libelf_Data *) ed;
 119
 120         if (d == NULL || ndx < 0 || dr == NULL ||
 121             (scn = d->d_scn) == NULL ||
 122             (e = scn->s_elf) == NULL) {
 123                 LIBELF_SET_ERROR(ARGUMENT, 0);
 124                 return (0);
 125         }
 126
 127         ec = e->e_class;
 128         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 129
 130         if (ec == ELFCLASS32)
 131                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 132         else
 133                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 134
 135         if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
 136                 LIBELF_SET_ERROR(ARGUMENT, 0);
 137                 return (0);
 138         }
 139
 140         msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
 141         assert(msz > 0);
 142
 143         if (msz * ndx >= d->d_data.d_size) {
 144                 LIBELF_SET_ERROR(ARGUMENT, 0);
 145                 return (0);
 146         }
 147
 148         if (ec == ELFCLASS32) {
 149                 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
 150
 151                 LIBELF_COPY_U32(rela32, dr, r_offset);
 152
 153                 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
 154                     ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
 155                         LIBELF_SET_ERROR(RANGE, 0);
 156                         return (0);
 157                 }
 158                 rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
 159                     ELF64_R_TYPE(dr->r_info));
 160
 161                 LIBELF_COPY_S32(rela32, dr, r_addend);
 162         } else {
 163                 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
 164
 165                 *rela64 = *dr;
 166         }
 167
 168         return (1);
 169 }