1 /*- 2 * Copyright (c) 2007 John Birrell (jb@freebsd.org) 3 * Copyright (c) 2014 Kai Wang 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include "_libdwarf.h" 29 30 ELFTC_VCSID("$Id: dwarf_cu.c 3041 2014-05-18 15:11:03Z kaiwang27 $"); 31 32 int 33 dwarf_next_cu_header_c(Dwarf_Debug dbg, Dwarf_Bool is_info, 34 Dwarf_Unsigned *cu_length, Dwarf_Half *cu_version, 35 Dwarf_Off *cu_abbrev_offset, Dwarf_Half *cu_pointer_size, 36 Dwarf_Half *cu_offset_size, Dwarf_Half *cu_extension_size, 37 Dwarf_Sig8 *type_signature, Dwarf_Unsigned *type_offset, 38 Dwarf_Unsigned *cu_next_offset, Dwarf_Error *error) 39 { 40 Dwarf_CU cu; 41 int ret; 42 43 if (dbg == NULL) { 44 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT); 45 return (DW_DLV_ERROR); 46 } 47 48 if (is_info) { 49 if (dbg->dbg_cu_current == NULL) 50 ret = _dwarf_info_first_cu(dbg, error); 51 else 52 ret = _dwarf_info_next_cu(dbg, error); 53 } else { 54 if (dbg->dbg_tu_current == NULL) 55 ret = _dwarf_info_first_tu(dbg, error); 56 else 57 ret = _dwarf_info_next_tu(dbg, error); 58 } 59 60 if (ret == DW_DLE_NO_ENTRY) { 61 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY); 62 return (DW_DLV_NO_ENTRY); 63 } else if (ret != DW_DLE_NONE) 64 return (DW_DLV_ERROR); 65 66 if (is_info) { 67 if (dbg->dbg_cu_current == NULL) { 68 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY); 69 return (DW_DLV_NO_ENTRY); 70 } 71 cu = dbg->dbg_cu_current; 72 } else { 73 if (dbg->dbg_tu_current == NULL) { 74 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY); 75 return (DW_DLV_NO_ENTRY); 76 } 77 cu = dbg->dbg_tu_current; 78 } 79 80 if (cu_length) 81 *cu_length = cu->cu_length; 82 if (cu_version) 83 *cu_version = cu->cu_version; 84 if (cu_abbrev_offset) 85 *cu_abbrev_offset = (Dwarf_Off) cu->cu_abbrev_offset; 86 if (cu_pointer_size) 87 *cu_pointer_size = cu->cu_pointer_size; 88 if (cu_offset_size) { 89 if (cu->cu_length_size == 4) 90 *cu_offset_size = 4; 91 else 92 *cu_offset_size = 8; 93 } 94 if (cu_extension_size) { 95 if (cu->cu_length_size == 4) 96 *cu_extension_size = 0; 97 else 98 *cu_extension_size = 4; 99 } 100 if (cu_next_offset) 101 *cu_next_offset = cu->cu_next_offset; 102 103 if (!is_info) { 104 if (type_signature) 105 *type_signature = cu->cu_type_sig; 106 if (type_offset) 107 *type_offset = cu->cu_type_offset; 108 } 109 110 return (DW_DLV_OK); 111 } 112 113 114 int 115 dwarf_next_cu_header_b(Dwarf_Debug dbg, Dwarf_Unsigned *cu_length, 116 Dwarf_Half *cu_version, Dwarf_Off *cu_abbrev_offset, 117 Dwarf_Half *cu_pointer_size, Dwarf_Half *cu_offset_size, 118 Dwarf_Half *cu_extension_size, Dwarf_Unsigned *cu_next_offset, 119 Dwarf_Error *error) 120 { 121 122 return (dwarf_next_cu_header_c(dbg, 1, cu_length, cu_version, 123 cu_abbrev_offset, cu_pointer_size, cu_offset_size, 124 cu_extension_size, NULL, NULL, cu_next_offset, error)); 125 } 126 127 int 128 dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned *cu_length, 129 Dwarf_Half *cu_version, Dwarf_Off *cu_abbrev_offset, 130 Dwarf_Half *cu_pointer_size, Dwarf_Unsigned *cu_next_offset, 131 Dwarf_Error *error) 132 { 133 134 return (dwarf_next_cu_header_b(dbg, cu_length, cu_version, 135 cu_abbrev_offset, cu_pointer_size, NULL, NULL, cu_next_offset, 136 error)); 137 } 138 139 int 140 dwarf_next_types_section(Dwarf_Debug dbg, Dwarf_Error *error) 141 { 142 143 /* Free resource allocated for current .debug_types section. */ 144 _dwarf_type_unit_cleanup(dbg); 145 dbg->dbg_types_loaded = 0; 146 dbg->dbg_types_off = 0; 147 148 /* Reset type unit pointer. */ 149 dbg->dbg_tu_current = NULL; 150 151 /* Search for the next .debug_types section. */ 152 dbg->dbg_types_sec = _dwarf_find_next_types_section(dbg, 153 dbg->dbg_types_sec); 154 155 if (dbg->dbg_types_sec == NULL) { 156 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY); 157 return (DW_DLV_NO_ENTRY); 158 } 159 160 return (DW_DLV_OK); 161 } 162