external/bsd/elftoolchain/dist/libdwarf/libdwarf_elf_access.c

   1 /*      $NetBSD: libdwarf_elf_access.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2009 Kai Wang
   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 "_libdwarf.h"
  30
  31 __RCSID("$NetBSD: libdwarf_elf_access.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  32 ELFTC_VCSID("Id: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy ");
  33
  34 int
  35 _dwarf_elf_get_section_info(void *obj, Dwarf_Half ndx,
  36     Dwarf_Obj_Access_Section *ret_section, int *error)
  37 {
  38         Dwarf_Elf_Object *e;
  39         GElf_Shdr *sh;
  40
  41         e = obj;
  42         assert(e != NULL);
  43
  44         if (ret_section == NULL) {
  45                 if (error)
  46                         *error = DW_DLE_ARGUMENT;
  47                 return (DW_DLV_ERROR);
  48         }
  49
  50         if (ndx >= e->eo_seccnt) {
  51                 if (error)
  52                         *error = DW_DLE_NO_ENTRY;
  53                 return (DW_DLV_NO_ENTRY);
  54         }
  55
  56         sh = &e->eo_shdr[ndx];
  57
  58         ret_section->addr = sh->sh_addr;
  59         ret_section->size = sh->sh_size;
  60
  61         ret_section->name = elf_strptr(e->eo_elf, e->eo_strndx, sh->sh_name);
  62         if (ret_section->name == NULL) {
  63                 if (error)
  64                         *error = DW_DLE_ELF;
  65                 return (DW_DLV_ERROR);
  66         }
  67
  68         return (DW_DLV_OK);
  69 }
  70
  71 Dwarf_Endianness
  72 _dwarf_elf_get_byte_order(void *obj)
  73 {
  74         Dwarf_Elf_Object *e;
  75
  76         e = obj;
  77         assert(e != NULL);
  78
  79         switch (e->eo_ehdr.e_ident[EI_DATA]) {
  80         case ELFDATA2MSB:
  81                 return (DW_OBJECT_MSB);
  82
  83         case ELFDATA2LSB:
  84         case ELFDATANONE:
  85         default:
  86                 return (DW_OBJECT_LSB);
  87         }
  88 }
  89
  90 Dwarf_Small
  91 _dwarf_elf_get_length_size(void *obj)
  92 {
  93         Dwarf_Elf_Object *e;
  94
  95         e = obj;
  96         assert(e != NULL);
  97
  98         if (gelf_getclass(e->eo_elf) == ELFCLASS32)
  99                 return (4);
 100         else if (e->eo_ehdr.e_machine == EM_MIPS)
 101                 return (8);
 102         else
 103                 return (4);
 104 }
 105
 106 Dwarf_Small
 107 _dwarf_elf_get_pointer_size(void *obj)
 108 {
 109         Dwarf_Elf_Object *e;
 110
 111         e = obj;
 112         assert(e != NULL);
 113
 114         if (gelf_getclass(e->eo_elf) == ELFCLASS32)
 115                 return (4);
 116         else
 117                 return (8);
 118 }
 119
 120 Dwarf_Unsigned
 121 _dwarf_elf_get_section_count(void *obj)
 122 {
 123         Dwarf_Elf_Object *e;
 124
 125         e = obj;
 126         assert(e != NULL);
 127
 128         return (e->eo_seccnt);
 129 }
 130
 131 int
 132 _dwarf_elf_load_section(void *obj, Dwarf_Half ndx, Dwarf_Small** ret_data,
 133     int *error)
 134 {
 135         Dwarf_Elf_Object *e;
 136         Dwarf_Elf_Data *ed;
 137
 138         e = obj;
 139         assert(e != NULL);
 140
 141         if (ret_data == NULL) {
 142                 if (error)
 143                         *error = DW_DLE_ARGUMENT;
 144                 return (DW_DLV_ERROR);
 145         }
 146
 147         if (ndx >= e->eo_seccnt) {
 148                 if (error)
 149                         *error = DW_DLE_NO_ENTRY;
 150                 return (DW_DLV_NO_ENTRY);
 151         }
 152
 153         ed = &e->eo_data[ndx];
 154
 155         if (ed->ed_alloc != NULL)
 156                 *ret_data = ed->ed_alloc;
 157         else {
 158                 if (ed->ed_data == NULL) {
 159                         if (error)
 160                                 *error = DW_DLE_NO_ENTRY;
 161                         return (DW_DLV_NO_ENTRY);
 162                 }
 163                 *ret_data = ed->ed_data->d_buf;
 164         }
 165
 166         return (DW_DLV_OK);
 167 }