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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * |
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5 * This program is free software: you can redistribute it and/or modify |
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6 * it under the terms of the GNU Lesser General Public License as published by |
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7 * the Free Software Foundation, either version 3 of the License, or |
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8 * (at your option) any later version. |
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9 * |
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10 * This program is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 * GNU Lesser General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU Lesser General Public License |
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 */ |
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18 |
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19 #include <iostream> |
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20 #include "dwarfmanager.h" |
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21 #include "inputfile.h" |
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22 |
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23 const string DwarfLineManager::iLineSectionName(".debug_line"); |
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24 |
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25 inline static size_t process_extended_line_op (FileShdrPair & aPair, Dwarf_Byte_Ptr data) |
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26 { |
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27 size_t bytes_read; |
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28 size_t len = (size_t)ULEB128(data, bytes_read); |
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29 |
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30 if (len == 0){ |
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31 cerr << "badly formed extended line op encountered!\n"; |
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32 // a length of 0 indicates a badly formed op and will force everything to be ignored until 'end_of_sequence'. |
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33 return 0; |
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34 } |
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35 |
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36 len += bytes_read; |
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37 unsigned char op_code = *data++; |
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38 switch (op_code){ |
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39 case DW_LNE_end_sequence: |
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40 break; |
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41 case DW_LNE_set_address: { |
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42 size_t size = len - bytes_read - 1; |
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43 LinearAddr addr = GetValue(data, size); |
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44 LinearAddr relocatedAddress = aPair.iXIPFileDetails.Relocate(addr); |
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45 if (addr != relocatedAddress) |
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46 WriteValue(data, relocatedAddress, size); |
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47 break; |
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48 } |
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49 case DW_LNE_define_file: |
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50 ULEB128(data, bytes_read); |
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51 ULEB128(data, bytes_read); |
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52 ULEB128(data, bytes_read); |
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53 break; |
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54 default: |
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55 |
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56 break; |
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57 } |
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58 |
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59 return len; |
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60 } |
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61 |
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62 void DwarfLineManager::ProcessSection(FileShdrPair & aPair, Dwarf_Byte_Ptr aStart, Dwarf_Byte_Ptr aEnd){ |
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63 Dwarf_Byte_Ptr start = aStart; |
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64 Dwarf_Byte_Ptr end = aEnd; |
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65 size_t bytes_read = 0; |
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66 while (start < end){ |
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67 Dwarf_Byte_Ptr hdrptr = start; |
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68 size_t offset_size, initial_length_size; |
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69 |
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70 Dwarf_Word length = READ_UNALIGNED4(hdrptr); |
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71 hdrptr += 4; |
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72 |
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73 if (length >= 0xfffffff0u) { |
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74 cerr << "Error: 64 bit DWARF not supported\n"; |
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75 exit(EXIT_FAILURE); |
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76 } else { |
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77 offset_size = 4; |
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78 initial_length_size = 4; |
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79 } |
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80 |
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81 Dwarf_Byte_Ptr end_of_sequence = start + length + initial_length_size; |
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82 |
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83 Dwarf_Half version = READ_UNALIGNED2(hdrptr); |
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84 hdrptr += 2; |
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85 |
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86 if (version != 2 && version != 3){ |
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87 static bool warned = false; |
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88 if (!warned){ |
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89 cerr << "Only DWARF 2 and 3 aranges are currently supported\n"; |
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90 warned = true; |
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91 } |
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92 return; |
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93 } |
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94 |
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95 hdrptr += offset_size; |
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96 #if 0 |
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97 // Don't need the next four fields |
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98 Dwarf_Ubyte min_insn_length = *hdrptr++; |
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99 Dwarf_Ubyte default_is_stmt = *hdrptr++; |
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100 Dwarf_Ubyte line_base = *hdrptr++; |
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101 Dwarf_Ubyte line_range = *hdrptr++; |
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102 #endif |
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103 hdrptr +=4; |
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104 Dwarf_Ubyte opcode_base = *hdrptr++; |
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105 |
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106 /* Skip the contents of the Opcodes table. */ |
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107 Dwarf_Byte_Ptr standard_opcodes = hdrptr; |
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108 start = standard_opcodes + opcode_base - 1; |
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109 |
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110 /* skip the contents of the Directory table. */ |
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111 while (*start != 0){ |
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112 start += strlen ((char *) start) + 1; |
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113 } |
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114 /* Skip the NUL at the end of the table. */ |
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115 start++; |
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116 |
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117 /* skip the contents of the File Name table. */ |
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118 while (*start != 0){ |
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119 start += strlen ((char *) start) + 1; |
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120 |
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121 ULEB128(start, bytes_read); |
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122 ULEB128(start, bytes_read); |
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123 ULEB128(start, bytes_read); |
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124 } |
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125 /* Skip the NUL at the end of the table. */ |
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126 start++; |
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127 |
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128 while (start < end_of_sequence){ |
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129 unsigned char op_code = *start++; |
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130 |
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131 if (op_code >= opcode_base){ |
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132 continue; |
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133 } else { |
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134 switch (op_code){ |
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135 // missing from dwarf.h - first byte of extended op codes is '0x0' |
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136 #define DW_LNS_extended_op 0x0 |
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137 case DW_LNS_extended_op: |
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138 size_t n = process_extended_line_op (aPair, start); |
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139 // if we don't understand the extended op skip to the end of the sequence :-( |
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140 if (n == 0) |
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141 start = end_of_sequence; |
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142 else |
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143 start += n; |
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144 break; |
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145 |
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146 case DW_LNS_copy: |
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147 break; |
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148 |
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149 case DW_LNS_advance_pc: |
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150 case DW_LNS_advance_line: |
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151 case DW_LNS_set_file: |
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152 case DW_LNS_set_column: |
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153 ULEB128(start, bytes_read); |
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154 break; |
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155 |
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156 case DW_LNS_negate_stmt: |
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157 case DW_LNS_set_basic_block: |
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158 case DW_LNS_const_add_pc: |
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159 break; |
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160 |
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161 case DW_LNS_fixed_advance_pc: |
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162 start += 2; |
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163 break; |
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164 |
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165 case DW_LNS_set_prologue_end: |
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166 case DW_LNS_set_epilogue_begin: |
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167 break; |
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168 |
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169 case DW_LNS_set_isa: |
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170 ULEB128(start, bytes_read); |
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171 break; |
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172 |
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173 default: |
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174 for (int i = standard_opcodes[op_code - 1]; i > 0 ; --i){ |
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175 ULEB128(start, bytes_read); |
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176 } |
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177 break; |
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178 } |
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179 } |
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180 } |
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181 // !! eek ARM seems to require header word aligned - at least for Dwarf 2 |
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182 if (aPair.iXIPFileDetails.iRVCTProduced && (version == 2)) |
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183 start = (Dwarf_Byte_Ptr)(((unsigned long)start + 3) & ~3); |
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184 } |
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185 } |