external/bsd/libelf/dist/gelf_cap.c

   1 /*      $NetBSD: gelf_cap.c,v 1.3 2009/12/19 07:31:04 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_cap.c,v 1.2.10.1.2.1 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 #if defined(__LIBELF_HAVE_ELF_CAP)
  39
  40 GElf_Cap *
  41 gelf_getcap(Elf_Data *d, int ndx, GElf_Cap *dst)
  42 {
  43         int ec;
  44         Elf *e;
  45         Elf_Scn *scn;
  46         Elf32_Cap *cap32;
  47         Elf64_Cap *cap64;
  48         size_t msz;
  49         uint32_t sh_type;
  50
  51         if (d == NULL || ndx < 0 || dst == NULL ||
  52             (scn = d->d_scn) == NULL ||
  53             (e = scn->s_elf) == 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_CAP) {
  67                 LIBELF_SET_ERROR(ARGUMENT, 0);
  68                 return (NULL);
  69         }
  70
  71         msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
  72
  73         assert(msz > 0);
  74
  75         if (msz * ndx >= d->d_size) {
  76                 LIBELF_SET_ERROR(ARGUMENT, 0);
  77                 return (NULL);
  78         }
  79
  80         if (ec == ELFCLASS32) {
  81
  82                 cap32 = (Elf32_Cap *) d->d_buf + ndx;
  83
  84                 dst->c_tag  = cap32->c_tag;
  85                 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val;
  86
  87         } else {
  88
  89                 cap64 = (Elf64_Cap *) d->d_buf + ndx;
  90
  91                 *dst = *cap64;
  92         }
  93
  94         return (dst);
  95 }
  96
  97 int
  98 gelf_update_cap(Elf_Data *d, int ndx, GElf_Cap *gc)
  99 {
 100         int ec;
 101         Elf *e;
 102         Elf_Scn *scn;
 103         Elf32_Cap *cap32;
 104         Elf64_Cap *cap64;
 105         size_t msz;
 106         uint32_t sh_type;
 107
 108         if (d == NULL || ndx < 0 || gc == NULL ||
 109             (scn = d->d_scn) == NULL ||
 110             (e = scn->s_elf) == NULL) {
 111                 LIBELF_SET_ERROR(ARGUMENT, 0);
 112                 return (0);
 113         }
 114
 115         ec = e->e_class;
 116         assert(ec == ELFCLASS32 || ec == ELFCLASS64);
 117
 118         if (ec == ELFCLASS32)
 119                 sh_type = scn->s_shdr.s_shdr32.sh_type;
 120         else
 121                 sh_type = scn->s_shdr.s_shdr64.sh_type;
 122
 123         if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) {
 124                 LIBELF_SET_ERROR(ARGUMENT, 0);
 125                 return (0);
 126         }
 127
 128         msz = _libelf_msize(ELF_T_CAP, ec, e->e_version);
 129         assert(msz > 0);
 130
 131         if (msz * ndx >= d->d_size) {
 132                 LIBELF_SET_ERROR(ARGUMENT, 0);
 133                 return (0);
 134         }
 135
 136         if (ec == ELFCLASS32) {
 137                 cap32 = (Elf32_Cap *) d->d_buf + ndx;
 138
 139                 LIBELF_COPY_U32(cap32, gc, c_tag);
 140                 LIBELF_COPY_U32(cap32, gc, c_un.c_val);
 141         } else {
 142                 cap64 = (Elf64_Cap *) d->d_buf + ndx;
 143
 144                 *cap64 = *gc;
 145         }
 146
 147         return (1);
 148 }
 149
 150 #endif /* __LIBELF_HAVE_ELF_CAP */