external/bsd/libelf/dist/gelf_sym.c

   1 /*      $NetBSD: gelf_sym.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_sym.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_getsym(Elf_Data *d, int ndx, GElf_Sym *dst)
  40 {
  41         int ec;
  42         Elf *e;
  43         Elf_Scn *scn;
  44         Elf32_Sym *sym32;
  45         Elf64_Sym *sym64;
  46         size_t msz;
  47         uint32_t sh_type;
  48
  49         if (d == NULL || ndx < 0 || dst == NULL ||
  50             (scn = d->d_scn) == NULL ||
  51             (e = scn->s_elf) == NULL) {
  52                 LIBELF_SET_ERROR(ARGUMENT, 0);
  53                 return (NULL);
  54         }
  55
  56         ec = e->e_class;
  57         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
  58
  59         if (ec == ELFCLASS32)
  60                 sh_type = scn->s_shdr.s_shdr32.sh_type;
  61         else
  62                 sh_type = scn->s_shdr.s_shdr64.sh_type;
  63
  64         if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) {
  65                 LIBELF_SET_ERROR(ARGUMENT, 0);
  66                 return (NULL);
  67         }
  68
  69         msz = _libelf_msize(ELF_T_SYM, ec, e->e_version);
  70
  71         assert(msz > 0);
  72
  73         if (msz * ndx >= d->d_size) {
  74                 LIBELF_SET_ERROR(ARGUMENT, 0);
  75                 return (NULL);
  76         }
  77
  78         if (ec == ELFCLASS32) {
  79
  80                 sym32 = (Elf32_Sym *) d->d_buf + ndx;
  81
  82                 dst->st_name  = sym32->st_name;
  83                 dst->st_value = (Elf64_Addr) sym32->st_value;
  84                 dst->st_size  = (Elf64_Xword) sym32->st_size;
  85                 dst->st_info  = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info),
  86                     ELF32_ST_TYPE(sym32->st_info));
  87                 dst->st_other = sym32->st_other;
  88                 dst->st_shndx = sym32->st_shndx;
  89         } else {
  90
  91                 sym64 = (Elf64_Sym *) d->d_buf + ndx;
  92
  93                 *dst = *sym64;
  94         }
  95
  96         return (dst);
  97 }
  98
  99 int
 100 gelf_update_sym(Elf_Data *d, int ndx, GElf_Sym *gs)
 101 {
 102         int ec;
 103         Elf *e;
 104         Elf_Scn *scn;
 105         Elf32_Sym *sym32;
 106         Elf64_Sym *sym64;
 107         size_t msz;
 108         uint32_t sh_type;
 109
 110         if (d == NULL || ndx < 0 || gs == NULL ||
 111             (scn = d->d_scn) == NULL ||
 112             (e = scn->s_elf) == NULL) {
 113                 LIBELF_SET_ERROR(ARGUMENT, 0);
 114                 return (0);
 115         }
 116
 117         ec = e->e_class;
 118         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 119
 120         if (ec == ELFCLASS32)
 121                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 122         else
 123                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 124
 125         if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) {
 126                 LIBELF_SET_ERROR(ARGUMENT, 0);
 127                 return (0);
 128         }
 129
 130         msz = _libelf_msize(ELF_T_SYM, ec, e->e_version);
 131         assert(msz > 0);
 132
 133         if (msz * ndx >= d->d_size) {
 134                 LIBELF_SET_ERROR(ARGUMENT, 0);
 135                 return (0);
 136         }
 137
 138         if (ec == ELFCLASS32) {
 139                 sym32 = (Elf32_Sym *) d->d_buf + ndx;
 140
 141                 sym32->st_name  = gs->st_name;
 142                 sym32->st_info  = gs->st_info;
 143                 sym32->st_other = gs->st_other;
 144                 sym32->st_shndx = gs->st_shndx;
 145
 146                 LIBELF_COPY_U32(sym32, gs, st_value);
 147                 LIBELF_COPY_U32(sym32, gs, st_size);
 148         } else {
 149                 sym64 = (Elf64_Sym *) d->d_buf + ndx;
 150
 151                 *sym64 = *gs;
 152         }
 153
 154         return (1);
 155 }