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

   1 /*      $NetBSD: gelf_cap.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_cap.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  42 ELFTC_VCSID("Id: gelf_cap.c 2272 2011-12-03 17:07:31Z jkoshy ");
  43
  44 GElf_Cap *
  45 gelf_getcap(Elf_Data *ed, int ndx, GElf_Cap *dst)
  46 {
  47         int ec;
  48         Elf *e;
  49         size_t msz;
  50         Elf_Scn *scn;
  51         Elf32_Cap *cap32;
  52         Elf64_Cap *cap64;
  53         uint32_t sh_type;
  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_CAP) {
  74                 LIBELF_SET_ERROR(ARGUMENT, 0);
  75                 return (NULL);
  76         }
  77
  78         msz = _libelf_msize(ELF_T_CAP, 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                 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
  90
  91                 dst->c_tag  = cap32->c_tag;
  92                 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
  93
  94         } else {
  95
  96                 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
  97
  98                 *dst = *cap64;
  99         }
 100
 101         return (dst);
 102 }
 103
 104 int
 105 gelf_update_cap(Elf_Data *ed, int ndx, GElf_Cap *gc)
 106 {
 107         int ec;
 108         Elf *e;
 109         size_t msz;
 110         Elf_Scn *scn;
 111         Elf32_Cap *cap32;
 112         Elf64_Cap *cap64;
 113         uint32_t sh_type;
 114         struct _Libelf_Data *d;
 115
 116         d = (struct _Libelf_Data *) ed;
 117
 118         if (d == NULL || ndx < 0 || gc == NULL ||
 119             (scn = d->d_scn) == NULL ||
 120             (e = scn->s_elf) == NULL) {
 121                 LIBELF_SET_ERROR(ARGUMENT, 0);
 122                 return (0);
 123         }
 124
 125         ec = e->e_class;
 126         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 127
 128         if (ec == ELFCLASS32)
 129                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 130         else
 131                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 132
 133         if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
 134                 LIBELF_SET_ERROR(ARGUMENT, 0);
 135                 return (0);
 136         }
 137
 138         msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
 139         assert(msz > 0);
 140
 141         if (msz * ndx >= d->d_data.d_size) {
 142                 LIBELF_SET_ERROR(ARGUMENT, 0);
 143                 return (0);
 144         }
 145
 146         if (ec == ELFCLASS32) {
 147                 cap32 = (Elf32_Cap *) d->d_data.d_buf + ndx;
 148
 149                 LIBELF_COPY_U32(cap32, gc, c_tag);
 150                 LIBELF_COPY_U32(cap32, gc, c_un.c_val);
 151         } else {
 152                 cap64 = (Elf64_Cap *) d->d_data.d_buf + ndx;
 153
 154                 *cap64 = *gc;
 155         }
 156
 157         return (1);
 158 }