external/bsd/libelf/dist/gelf_symshndx.c

   1 /*      $NetBSD: gelf_symshndx.c,v 1.2 2009/12/19 06:39:29 thorpej Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2006 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 #include <sys/cdefs.h>
  30 /* __FBSDID("$FreeBSD: src/lib/libelf/gelf_symshndx.c,v 1.1.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */
  31
  32 #include <assert.h>
  33 #include <limits.h>
  34 #include <gelf.h>
  35
  36 #include "_libelf.h"
  37
  38 GElf_Sym *
  39 gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
  40     Elf32_Word *shindex)
  41 {
  42         int ec;
  43         Elf *e;
  44         Elf_Scn *scn;
  45         size_t msz;
  46         uint32_t sh_type;
  47
  48         if (gelf_getsym(d, ndx, dst) == 0)
  49                 return (NULL);
  50
  51         if (id == NULL || (scn = id->d_scn) == NULL ||
  52             (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf) ||
  53             shindex == NULL) {
  54                 LIBELF_SET_ERROR(ARGUMENT, 0);
  55                 return (NULL);
  56         }
  57
  58         ec = e->e_class;
  59         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  60
  61         if (ec == ELFCLASS32)
  62                 sh_type = scn->s_shdr.s_shdr32.sh_type;
  63         else
  64                 sh_type = scn->s_shdr.s_shdr64.sh_type;
  65
  66         if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
  67            id->d_type != ELF_T_WORD) {
  68                 LIBELF_SET_ERROR(ARGUMENT, 0);
  69                 return (NULL);
  70         }
  71
  72         msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
  73
  74         assert(msz > 0);
  75
  76         if (msz * ndx >= id->d_size) {
  77                 LIBELF_SET_ERROR(ARGUMENT, 0);
  78                 return (NULL);
  79         }
  80
  81         *shindex = ((Elf32_Word *) id->d_buf)[ndx];
  82
  83         return (dst);
  84 }
  85
  86 int
  87 gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
  88     Elf32_Word xindex)
  89 {
  90         int ec;
  91         Elf *e;
  92         Elf_Scn *scn;
  93         size_t msz;
  94         uint32_t sh_type;
  95
  96         if (gelf_update_sym(d, ndx, gs) == 0)
  97                 return (0);
  98
  99         if (id == NULL || (scn = id->d_scn) == NULL ||
 100             (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf)) {
 101                 LIBELF_SET_ERROR(ARGUMENT, 0);
 102                 return (0);
 103         }
 104
 105         ec = e->e_class;
 106         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 107
 108         if (ec == ELFCLASS32)
 109                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 110         else
 111                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 112
 113         if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
 114             d->d_type != ELF_T_WORD) {
 115                 LIBELF_SET_ERROR(ARGUMENT, 0);
 116                 return (0);
 117         }
 118
 119         msz = _libelf_msize(ELF_T_WORD, ec, e->e_version);
 120         assert(msz > 0);
 121
 122         if (msz * ndx >= id->d_size) {
 123                 LIBELF_SET_ERROR(ARGUMENT, 0);
 124                 return (0);
 125         }
 126
 127         *(((Elf32_Word *) id->d_buf) + ndx) = xindex;
 128
 129         return (1);
 130 }