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

   1 /*      $NetBSD: gelf_symshndx.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
  38 #include "_libelf.h"
  39
  40 __RCSID("$NetBSD: gelf_symshndx.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  41 ELFTC_VCSID("Id: gelf_symshndx.c 2283 2011-12-04 04:07:24Z jkoshy ");
  42
  43 GElf_Sym *
  44 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
  45     Elf32_Word *shindex)
  46 {
  47         int ec;
  48         Elf *e;
  49         size_t msz;
  50         Elf_Scn *scn;
  51         uint32_t sh_type;
  52         struct _Libelf_Data *ld, *lid;
  53
  54         ld = (struct _Libelf_Data *) d;
  55         lid = (struct _Libelf_Data *) id;
  56
  57         if (gelf_getsym(d, ndx, dst) == 0)
  58                 return (NULL);
  59
  60         if (lid == NULL || (scn = lid->d_scn) == NULL ||
  61             (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf) ||
  62             shindex == NULL) {
  63                 LIBELF_SET_ERROR(ARGUMENT, 0);
  64                 return (NULL);
  65         }
  66
  67         ec = e->e_class;
  68         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  69
  70         if (ec == ELFCLASS32)
  71                 sh_type = scn->s_shdr.s_shdr32.sh_type;
  72         else
  73                 sh_type = scn->s_shdr.s_shdr64.sh_type;
  74
  75         if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
  76            id->d_type != ELF_T_WORD) {
  77                 LIBELF_SET_ERROR(ARGUMENT, 0);
  78                 return (NULL);
  79         }
  80
  81         msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
  82
  83         assert(msz > 0);
  84
  85         if (msz * ndx >= id->d_size) {
  86                 LIBELF_SET_ERROR(ARGUMENT, 0);
  87                 return (NULL);
  88         }
  89
  90         *shindex = ((Elf32_Word *) id->d_buf)[ndx];
  91
  92         return (dst);
  93 }
  94
  95 int
  96 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
  97     Elf32_Word xindex)
  98 {
  99         int ec;
 100         Elf *e;
 101         size_t msz;
 102         Elf_Scn *scn;
 103         uint32_t sh_type;
 104         struct _Libelf_Data *ld, *lid;
 105
 106         ld = (struct _Libelf_Data *) d;
 107         lid = (struct _Libelf_Data *) id;
 108
 109         if (gelf_update_sym(d, ndx, gs) == 0)
 110                 return (0);
 111
 112         if (lid == NULL || (scn = lid->d_scn) == NULL ||
 113             (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
 114                 LIBELF_SET_ERROR(ARGUMENT, 0);
 115                 return (0);
 116         }
 117
 118         ec = e->e_class;
 119         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 120
 121         if (ec == ELFCLASS32)
 122                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 123         else
 124                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 125
 126         if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
 127             d->d_type != ELF_T_WORD) {
 128                 LIBELF_SET_ERROR(ARGUMENT, 0);
 129                 return (0);
 130         }
 131
 132         msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
 133         assert(msz > 0);
 134
 135         if (msz * ndx >= id->d_size) {
 136                 LIBELF_SET_ERROR(ARGUMENT, 0);
 137                 return (0);
 138         }
 139
 140         *(((Elf32_Word *) id->d_buf) + ndx) = xindex;
 141
 142         return (1);
 143 }