1 /*- 2 * Copyright (c) 2009 Kai Wang 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include "_libdwarf.h" 28 29 ELFTC_VCSID("$Id: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy $"); 30 31 int 32 _dwarf_elf_get_section_info(void *obj, Dwarf_Half ndx, 33 Dwarf_Obj_Access_Section *ret_section, int *error) 34 { 35 Dwarf_Elf_Object *e; 36 GElf_Shdr *sh; 37 38 e = obj; 39 assert(e != NULL); 40 41 if (ret_section == NULL) { 42 if (error) 43 *error = DW_DLE_ARGUMENT; 44 return (DW_DLV_ERROR); 45 } 46 47 if (ndx >= e->eo_seccnt) { 48 if (error) 49 *error = DW_DLE_NO_ENTRY; 50 return (DW_DLV_NO_ENTRY); 51 } 52 53 sh = &e->eo_shdr[ndx]; 54 55 ret_section->addr = sh->sh_addr; 56 ret_section->size = sh->sh_size; 57 58 ret_section->name = elf_strptr(e->eo_elf, e->eo_strndx, sh->sh_name); 59 if (ret_section->name == NULL) { 60 if (error) 61 *error = DW_DLE_ELF; 62 return (DW_DLV_ERROR); 63 } 64 65 return (DW_DLV_OK); 66 } 67 68 Dwarf_Endianness 69 _dwarf_elf_get_byte_order(void *obj) 70 { 71 Dwarf_Elf_Object *e; 72 73 e = obj; 74 assert(e != NULL); 75 76 switch (e->eo_ehdr.e_ident[EI_DATA]) { 77 case ELFDATA2MSB: 78 return (DW_OBJECT_MSB); 79 80 case ELFDATA2LSB: 81 case ELFDATANONE: 82 default: 83 return (DW_OBJECT_LSB); 84 } 85 } 86 87 Dwarf_Small 88 _dwarf_elf_get_length_size(void *obj) 89 { 90 Dwarf_Elf_Object *e; 91 92 e = obj; 93 assert(e != NULL); 94 95 if (gelf_getclass(e->eo_elf) == ELFCLASS32) 96 return (4); 97 else if (e->eo_ehdr.e_machine == EM_MIPS) 98 return (8); 99 else 100 return (4); 101 } 102 103 Dwarf_Small 104 _dwarf_elf_get_pointer_size(void *obj) 105 { 106 Dwarf_Elf_Object *e; 107 108 e = obj; 109 assert(e != NULL); 110 111 if (gelf_getclass(e->eo_elf) == ELFCLASS32) 112 return (4); 113 else 114 return (8); 115 } 116 117 Dwarf_Unsigned 118 _dwarf_elf_get_section_count(void *obj) 119 { 120 Dwarf_Elf_Object *e; 121 122 e = obj; 123 assert(e != NULL); 124 125 return (e->eo_seccnt); 126 } 127 128 int 129 _dwarf_elf_load_section(void *obj, Dwarf_Half ndx, Dwarf_Small** ret_data, 130 int *error) 131 { 132 Dwarf_Elf_Object *e; 133 Dwarf_Elf_Data *ed; 134 135 e = obj; 136 assert(e != NULL); 137 138 if (ret_data == NULL) { 139 if (error) 140 *error = DW_DLE_ARGUMENT; 141 return (DW_DLV_ERROR); 142 } 143 144 if (ndx >= e->eo_seccnt) { 145 if (error) 146 *error = DW_DLE_NO_ENTRY; 147 return (DW_DLV_NO_ENTRY); 148 } 149 150 ed = &e->eo_data[ndx]; 151 152 if (ed->ed_alloc != NULL) 153 *ret_data = ed->ed_alloc; 154 else { 155 if (ed->ed_data == NULL) { 156 if (error) 157 *error = DW_DLE_NO_ENTRY; 158 return (DW_DLV_NO_ENTRY); 159 } 160 *ret_data = ed->ed_data->d_buf; 161 } 162 163 return (DW_DLV_OK); 164 } 165