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

   1 /*      $NetBSD: gelf_sym.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_sym.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  42 ELFTC_VCSID("Id: gelf_sym.c 2272 2011-12-03 17:07:31Z jkoshy ");
  43
  44 GElf_Sym *
  45 gelf_getsym(Elf_Data *ed, int ndx, GElf_Sym *dst)
  46 {
  47         int ec;
  48         Elf *e;
  49         size_t msz;
  50         Elf_Scn *scn;
  51         uint32_t sh_type;
  52         Elf32_Sym *sym32;
  53         Elf64_Sym *sym64;
  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_SYM) {
  74                 LIBELF_SET_ERROR(ARGUMENT, 0);
  75                 return (NULL);
  76         }
  77
  78         msz = _libelf_msize(ELF_T_SYM, 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
  89                 sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx;
  90
  91                 dst->st_name  = sym32->st_name;
  92                 dst->st_value = (Elf64_Addr) sym32->st_value;
  93                 dst->st_size  = (Elf64_Xword) sym32->st_size;
  94                 dst->st_info  = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info),
  95                     ELF32_ST_TYPE(sym32->st_info));
  96                 dst->st_other = sym32->st_other;
  97                 dst->st_shndx = sym32->st_shndx;
  98         } else {
  99
 100                 sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx;
 101
 102                 *dst = *sym64;
 103         }
 104
 105         return (dst);
 106 }
 107
 108 int
 109 gelf_update_sym(Elf_Data *ed, int ndx, GElf_Sym *gs)
 110 {
 111         int ec;
 112         Elf *e;
 113         size_t msz;
 114         Elf_Scn *scn;
 115         uint32_t sh_type;
 116         Elf32_Sym *sym32;
 117         Elf64_Sym *sym64;
 118         struct _Libelf_Data *d;
 119
 120         d = (struct _Libelf_Data *) ed;
 121
 122         if (d == NULL || ndx < 0 || gs == NULL ||
 123             (scn = d->d_scn) == NULL ||
 124             (e = scn->s_elf) == NULL) {
 125                 LIBELF_SET_ERROR(ARGUMENT, 0);
 126                 return (0);
 127         }
 128
 129         ec = e->e_class;
 130         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 131
 132         if (ec == ELFCLASS32)
 133                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 134         else
 135                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 136
 137         if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) {
 138                 LIBELF_SET_ERROR(ARGUMENT, 0);
 139                 return (0);
 140         }
 141
 142         msz = _libelf_msize(ELF_T_SYM, ec, e->e_version);
 143         assert(msz > 0);
 144
 145         if (msz * ndx >= d->d_data.d_size) {
 146                 LIBELF_SET_ERROR(ARGUMENT, 0);
 147                 return (0);
 148         }
 149
 150         if (ec == ELFCLASS32) {
 151                 sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx;
 152
 153                 sym32->st_name  = gs->st_name;
 154                 sym32->st_info  = gs->st_info;
 155                 sym32->st_other = gs->st_other;
 156                 sym32->st_shndx = gs->st_shndx;
 157
 158                 LIBELF_COPY_U32(sym32, gs, st_value);
 159                 LIBELF_COPY_U32(sym32, gs, st_size);
 160         } else {
 161                 sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx;
 162
 163                 *sym64 = *gs;
 164         }
 165
 166         return (1);
 167 }