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

   1 /*      $NetBSD: gelf_rel.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_rel.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  42 ELFTC_VCSID("Id: gelf_rel.c 2272 2011-12-03 17:07:31Z jkoshy ");
  43
  44 GElf_Rel *
  45 gelf_getrel(Elf_Data *ed, int ndx, GElf_Rel *dst)
  46 {
  47         int ec;
  48         Elf *e;
  49         size_t msz;
  50         Elf_Scn *scn;
  51         uint32_t sh_type;
  52         Elf32_Rel *rel32;
  53         Elf64_Rel *rel64;
  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_REL) {
  74                 LIBELF_SET_ERROR(ARGUMENT, 0);
  75                 return (NULL);
  76         }
  77
  78         msz = _libelf_msize(ELF_T_REL, 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                 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx;
  89
  90                 dst->r_offset = (Elf64_Addr) rel32->r_offset;
  91                 dst->r_info   = ELF64_R_INFO(
  92                     (Elf64_Xword) ELF32_R_SYM(rel32->r_info),
  93                     ELF32_R_TYPE(rel32->r_info));
  94
  95         } else {
  96
  97                 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx;
  98
  99                 *dst = *rel64;
 100         }
 101
 102         return (dst);
 103 }
 104
 105 int
 106 gelf_update_rel(Elf_Data *ed, int ndx, GElf_Rel *dr)
 107 {
 108         int ec;
 109         Elf *e;
 110         size_t msz;
 111         Elf_Scn *scn;
 112         uint32_t sh_type;
 113         Elf32_Rel *rel32;
 114         Elf64_Rel *rel64;
 115         struct _Libelf_Data *d;
 116
 117         d = (struct _Libelf_Data *) ed;
 118
 119         if (d == NULL || ndx < 0 || dr == NULL ||
 120             (scn = d->d_scn) == NULL ||
 121             (e = scn->s_elf) == NULL) {
 122                 LIBELF_SET_ERROR(ARGUMENT, 0);
 123                 return (0);
 124         }
 125
 126         ec = e->e_class;
 127         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 128
 129         if (ec == ELFCLASS32)
 130                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 131         else
 132                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 133
 134         if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
 135                 LIBELF_SET_ERROR(ARGUMENT, 0);
 136                 return (0);
 137         }
 138
 139         msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
 140         assert(msz > 0);
 141
 142         if (msz * ndx >= d->d_data.d_size) {
 143                 LIBELF_SET_ERROR(ARGUMENT, 0);
 144                 return (0);
 145         }
 146
 147         if (ec == ELFCLASS32) {
 148                 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx;
 149
 150                 LIBELF_COPY_U32(rel32, dr, r_offset);
 151
 152                 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
 153                     ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
 154                         LIBELF_SET_ERROR(RANGE, 0);
 155                         return (0);
 156                 }
 157                 rel32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
 158                     ELF64_R_TYPE(dr->r_info));
 159         } else {
 160                 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx;
 161
 162                 *rel64 = *dr;
 163         }
 164
 165         return (1);
 166 }