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6324 | serge | 1 | /* Mach-O compact unwind encoding. |
2 | Copyright (C) 2014-2015 Free Software Foundation, Inc. |
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3 | |||
4 | This file is part of BFD, the Binary File Descriptor library. |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |||
11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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19 | MA 02110-1301, USA. */ |
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20 | |||
21 | #ifndef _MACH_O_UNWIND_H |
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22 | #define _MACH_O_UNWIND_H |
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23 | |||
24 | /* Encodings bits for all cpus. */ |
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25 | #define MACH_O_UNWIND_IS_NOT_FUNCTION_START 0x80000000 |
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26 | #define MACH_O_UNWIND_HAS_LSDA 0x40000000 |
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27 | #define MACH_O_UNWIND_PERSONALITY_MASK 0x30000000 |
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28 | #define MACH_O_UNWIND_PERSONALITY_SHIFT 28 |
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29 | |||
30 | /* Encodings for x86-64. */ |
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31 | |||
32 | /* Kind of encoding (4 bits). */ |
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33 | #define MACH_O_UNWIND_X86_64_MODE_MASK 0x0f000000 |
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34 | |||
35 | /* Frame is RBP based, using the standard sequence: push %rbp; mov %rsp, %rbp. |
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36 | Non-volatile registers must be saved in the stack starting at %rbp-8 to |
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37 | %rbp-2040 (offset is encoded in offset bits * 8). Registers saved are |
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38 | encoded in registers bits, 3 bits per register. */ |
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39 | #define MACH_O_UNWIND_X86_64_MODE_RBP_FRAME 0x01000000 |
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40 | #define MACH_O_UNWIND_X86_64_RBP_FRAME_REGSITERS 0x00007FFF |
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41 | #define MACH_O_UNWIND_X86_64_RBP_FRAME_OFFSET 0x00FF0000 |
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42 | |||
43 | /* Frameless function, with a small stack size. */ |
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44 | #define MACH_O_UNWIND_X86_64_MODE_STACK_IMMD 0x02000000 |
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45 | #define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_SIZE 0x00FF0000 |
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46 | #define MACH_O_UNWIND_X86_64_FRAMELESS_REG_COUNT 0x00001C00 |
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47 | #define MACH_O_UNWIND_X86_64_FRAMELESS_REG_PERMUTATION 0x000003FF |
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48 | |||
49 | /* Frameless function, with a larger stack size. The stack size is the sum |
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50 | of the X in subq $X,%rsp (address of X is at function + stack size bits) |
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51 | and stack adjust. */ |
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52 | #define MACH_O_UNWIND_X86_64_MODE_STACK_IND 0x03000000 |
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53 | #define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_ADJUST 0x0000E000 |
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54 | |||
55 | /* Use dwarf. */ |
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56 | #define MACH_O_UNWIND_X86_64_MODE_DWARF 0x04000000 |
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57 | #define MACH_O_UNWIND_X86_64_DWARF_SECTION_OFFSET 0x00ffffff |
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58 | |||
59 | /* Registers. */ |
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60 | #define MACH_O_UNWIND_X86_64_REG_NONE 0 |
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61 | #define MACH_O_UNWIND_X86_64_REG_RBX 1 |
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62 | #define MACH_O_UNWIND_X86_64_REG_R12 2 |
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63 | #define MACH_O_UNWIND_X86_64_REG_R13 3 |
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64 | #define MACH_O_UNWIND_X86_64_REG_R14 4 |
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65 | #define MACH_O_UNWIND_X86_64_REG_R15 5 |
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66 | #define MACH_O_UNWIND_X86_64_REG_RBP 6 |
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67 | |||
68 | /* Encodings for x86 (almot the same as x86-64). */ |
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69 | |||
70 | /* Kind of encoding (4 bits). */ |
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71 | #define MACH_O_UNWIND_X86_MODE_MASK 0x0f000000 |
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72 | |||
73 | /* Frame is EBP based, using the standard sequence: push %ebp; mov %esp, %ebp. |
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74 | Non-volatile registers must be saved in the stack starting at %ebp-4 to |
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75 | %ebp-240 (offset is encoded in offset bits * 4). Registers saved are |
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76 | encoded in registers bits, 3 bits per register. */ |
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77 | #define MACH_O_UNWIND_X86_MODE_EBP_FRAME 0x01000000 |
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78 | #define MACH_O_UNWIND_X86_EBP_FRAME_REGSITERS 0x00007FFF |
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79 | #define MACH_O_UNWIND_X86_EBP_FRAME_OFFSET 0x00FF0000 |
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80 | |||
81 | /* Frameless function, with a small stack size. */ |
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82 | #define MACH_O_UNWIND_X86_MODE_STACK_IMMD 0x02000000 |
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83 | #define MACH_O_UNWIND_X86_FRAMELESS_STACK_SIZE 0x00FF0000 |
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84 | #define MACH_O_UNWIND_X86_FRAMELESS_REG_COUNT 0x00001C00 |
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85 | #define MACH_O_UNWIND_X86_FRAMELESS_REG_PERMUTATION 0x000003FF |
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86 | |||
87 | /* Frameless function, with a larger stack size. The stack size is the sum |
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88 | of the X in subq $X,%esp (address of X is at function + stack size bits) |
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89 | and stack adjust. */ |
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90 | #define MACH_O_UNWIND_X86_MODE_STACK_IND 0x03000000 |
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91 | #define MACH_O_UNWIND_X86_FRAMELESS_STACK_ADJUST 0x0000E000 |
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92 | |||
93 | /* Use dwarf. */ |
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94 | #define MACH_O_UNWIND_X86_MODE_DWARF 0x04000000 |
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95 | #define MACH_O_UNWIND_X86_DWARF_SECTION_OFFSET 0x00ffffff |
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96 | |||
97 | /* Registers. */ |
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98 | #define MACH_O_UNWIND_X86_REG_NONE 0 |
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99 | #define MACH_O_UNWIND_X86_REG_EBX 1 |
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100 | #define MACH_O_UNWIND_X86_REG_ECX 2 |
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101 | #define MACH_O_UNWIND_X86_REG_EDX 3 |
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102 | #define MACH_O_UNWIND_X86_REG_EDI 4 |
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103 | #define MACH_O_UNWIND_X86_REG_ESI 5 |
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104 | #define MACH_O_UNWIND_X86_REG_EBP 6 |
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105 | |||
106 | /* Entry in object file (in __LD,__compact_unwind section). */ |
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107 | |||
108 | struct mach_o_compact_unwind_32 |
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109 | { |
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110 | unsigned char start[4]; |
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111 | unsigned char length[4]; |
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112 | unsigned char encoding[4]; |
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113 | unsigned char personality[4]; |
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114 | unsigned char lsda[4]; |
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115 | }; |
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116 | |||
117 | struct mach_o_compact_unwind_64 |
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118 | { |
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119 | unsigned char start[8]; |
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120 | unsigned char length[4]; |
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121 | unsigned char encoding[4]; |
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122 | unsigned char personality[8]; |
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123 | unsigned char lsda[8]; |
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124 | }; |
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125 | |||
126 | /* Header in images (in __TEXT,__unwind_info). */ |
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127 | |||
128 | #define MACH_O_UNWIND_SECTION_VERSION 1 /* Current verion in header. */ |
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129 | struct mach_o_unwind_info_header |
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130 | { |
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131 | unsigned char version[4]; /* Currently MACH_O_UNWIND_SECTION_VERSION. */ |
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132 | unsigned char encodings_array_offset[4]; |
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133 | unsigned char encodings_array_count[4]; |
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134 | unsigned char personality_array_offset[4]; |
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135 | unsigned char personality_array_count[4]; |
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136 | unsigned char index_offset[4]; |
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137 | unsigned char index_count[4]; |
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138 | /* Followed by: |
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139 | - encodings array |
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140 | These are the encodings shared, for index < encoding_array_count |
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141 | - personality array |
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142 | count given by personality_array_count |
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143 | - index entries |
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144 | count given by index_count |
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145 | - lsda index entries |
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146 | last offset given by lsda offset of last index_entry. |
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147 | */ |
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148 | }; |
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149 | |||
150 | struct mach_o_unwind_index_entry |
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151 | { |
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152 | unsigned char function_offset[4]; |
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153 | unsigned char second_level_offset[4]; |
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154 | unsigned char lsda_index_offset[4]; |
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155 | }; |
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156 | |||
157 | struct mach_o_unwind_lsda_index_entry |
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158 | { |
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159 | unsigned char function_offset[4]; |
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160 | unsigned char lsda_offset[4]; |
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161 | }; |
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162 | |||
163 | /* Second level index pages. */ |
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164 | |||
165 | #define MACH_O_UNWIND_SECOND_LEVEL_REGULAR 2 |
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166 | struct mach_o_unwind_regular_second_level_page_header |
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167 | { |
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168 | unsigned char kind[4]; |
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169 | unsigned char entry_page_offset[2]; |
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170 | unsigned char entry_count[2]; |
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171 | /* Array of entries. */ |
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172 | }; |
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173 | |||
174 | struct mach_o_unwind_regular_second_level_entry |
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175 | { |
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176 | unsigned char function_offset[4]; |
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177 | unsigned char encoding[4]; |
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178 | }; |
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179 | |||
180 | #define MACH_O_UNWIND_SECOND_LEVEL_COMPRESSED 3 |
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181 | struct mach_o_unwind_compressed_second_level_page_header |
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182 | { |
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183 | unsigned char kind[4]; |
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184 | unsigned char entry_page_offset[2]; |
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185 | unsigned char entry_count[2]; |
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186 | unsigned char encodings_offset[2]; |
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187 | unsigned char encodings_count[2]; |
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188 | /* Followed by entries array (one word, see below). */ |
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189 | /* Followed by (non-common) encodings array. */ |
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190 | }; |
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191 | |||
192 | /* Compressed entries are one word, containing function offset and encoding |
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193 | index. */ |
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194 | #define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(en) \ |
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195 | ((en) & 0x00FFFFFF) |
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196 | #define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(en) \ |
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197 | (((en) >> 24) & 0xFF) |
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198 | |||
199 | #endif /* _MACH_O_UNWIND_H */> |