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1 | /* Mach-O compact unwind encoding. |
2 | Copyright (C) 2014 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #ifndef _MACH_O_UNWIND_H | |
22 | #define _MACH_O_UNWIND_H | |
23 | ||
24 | /* Encodings bits for all cpus. */ | |
25 | #define MACH_O_UNWIND_IS_NOT_FUNCTION_START 0x80000000 | |
26 | #define MACH_O_UNWIND_HAS_LSDA 0x40000000 | |
27 | #define MACH_O_UNWIND_PERSONALITY_MASK 0x30000000 | |
28 | #define MACH_O_UNWIND_PERSONALITY_SHIFT 28 | |
29 | ||
30 | /* Encodings for x86-64. */ | |
31 | ||
32 | /* Kind of encoding (4 bits). */ | |
33 | #define MACH_O_UNWIND_X86_64_MODE_MASK 0x0f000000 | |
34 | ||
35 | /* Frame is RBP based, using the standard sequence: push %rbp; mov %rsp, %rbp. | |
36 | Non-volatile registers must be saved in the stack starting at %rbp-8 to | |
37 | %rbp-2040 (offset is encoded in offset bits * 8). Registers saved are | |
38 | encoded in registers bits, 3 bits per register. */ | |
39 | #define MACH_O_UNWIND_X86_64_MODE_RBP_FRAME 0x01000000 | |
40 | #define MACH_O_UNWIND_X86_64_RBP_FRAME_REGSITERS 0x00007FFF | |
41 | #define MACH_O_UNWIND_X86_64_RBP_FRAME_OFFSET 0x00FF0000 | |
42 | ||
43 | /* Frameless function, with a small stack size. */ | |
44 | #define MACH_O_UNWIND_X86_64_MODE_STACK_IMMD 0x02000000 | |
45 | #define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_SIZE 0x00FF0000 | |
46 | #define MACH_O_UNWIND_X86_64_FRAMELESS_REG_COUNT 0x00001C00 | |
47 | #define MACH_O_UNWIND_X86_64_FRAMELESS_REG_PERMUTATION 0x000003FF | |
48 | ||
49 | /* Frameless function, with a larger stack size. The stack size is the sum | |
50 | of the X in subq $X,%rsp (address of X is at function + stack size bits) | |
51 | and stack adjust. */ | |
52 | #define MACH_O_UNWIND_X86_64_MODE_STACK_IND 0x03000000 | |
53 | #define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_ADJUST 0x0000E000 | |
54 | ||
55 | /* Use dwarf. */ | |
56 | #define MACH_O_UNWIND_X86_64_MODE_DWARF 0x04000000 | |
57 | #define MACH_O_UNWIND_X86_64_DWARF_SECTION_OFFSET 0x00ffffff | |
58 | ||
59 | /* Registers. */ | |
60 | #define MACH_O_UNWIND_X86_64_REG_NONE 0 | |
61 | #define MACH_O_UNWIND_X86_64_REG_RBX 1 | |
62 | #define MACH_O_UNWIND_X86_64_REG_R12 2 | |
63 | #define MACH_O_UNWIND_X86_64_REG_R13 3 | |
64 | #define MACH_O_UNWIND_X86_64_REG_R14 4 | |
65 | #define MACH_O_UNWIND_X86_64_REG_R15 5 | |
66 | #define MACH_O_UNWIND_X86_64_REG_RBP 6 | |
67 | ||
68 | /* Encodings for x86 (almot the same as x86-64). */ | |
69 | ||
70 | /* Kind of encoding (4 bits). */ | |
71 | #define MACH_O_UNWIND_X86_MODE_MASK 0x0f000000 | |
72 | ||
73 | /* Frame is EBP based, using the standard sequence: push %ebp; mov %esp, %ebp. | |
74 | Non-volatile registers must be saved in the stack starting at %ebp-4 to | |
75 | %ebp-240 (offset is encoded in offset bits * 4). Registers saved are | |
76 | encoded in registers bits, 3 bits per register. */ | |
77 | #define MACH_O_UNWIND_X86_MODE_EBP_FRAME 0x01000000 | |
78 | #define MACH_O_UNWIND_X86_EBP_FRAME_REGSITERS 0x00007FFF | |
79 | #define MACH_O_UNWIND_X86_EBP_FRAME_OFFSET 0x00FF0000 | |
80 | ||
81 | /* Frameless function, with a small stack size. */ | |
82 | #define MACH_O_UNWIND_X86_MODE_STACK_IMMD 0x02000000 | |
83 | #define MACH_O_UNWIND_X86_FRAMELESS_STACK_SIZE 0x00FF0000 | |
84 | #define MACH_O_UNWIND_X86_FRAMELESS_REG_COUNT 0x00001C00 | |
85 | #define MACH_O_UNWIND_X86_FRAMELESS_REG_PERMUTATION 0x000003FF | |
86 | ||
87 | /* Frameless function, with a larger stack size. The stack size is the sum | |
88 | of the X in subq $X,%esp (address of X is at function + stack size bits) | |
89 | and stack adjust. */ | |
90 | #define MACH_O_UNWIND_X86_MODE_STACK_IND 0x03000000 | |
91 | #define MACH_O_UNWIND_X86_FRAMELESS_STACK_ADJUST 0x0000E000 | |
92 | ||
93 | /* Use dwarf. */ | |
94 | #define MACH_O_UNWIND_X86_MODE_DWARF 0x04000000 | |
95 | #define MACH_O_UNWIND_X86_DWARF_SECTION_OFFSET 0x00ffffff | |
96 | ||
97 | /* Registers. */ | |
98 | #define MACH_O_UNWIND_X86_REG_NONE 0 | |
99 | #define MACH_O_UNWIND_X86_REG_EBX 1 | |
100 | #define MACH_O_UNWIND_X86_REG_ECX 2 | |
101 | #define MACH_O_UNWIND_X86_REG_EDX 3 | |
102 | #define MACH_O_UNWIND_X86_REG_EDI 4 | |
103 | #define MACH_O_UNWIND_X86_REG_ESI 5 | |
104 | #define MACH_O_UNWIND_X86_REG_EBP 6 | |
105 | ||
106 | /* Entry in object file (in __LD,__compact_unwind section). */ | |
107 | ||
108 | struct mach_o_compact_unwind_32 | |
109 | { | |
110 | unsigned char start[4]; | |
111 | unsigned char length[4]; | |
112 | unsigned char encoding[4]; | |
113 | unsigned char personality[4]; | |
114 | unsigned char lsda[4]; | |
115 | }; | |
116 | ||
117 | struct mach_o_compact_unwind_64 | |
118 | { | |
119 | unsigned char start[8]; | |
120 | unsigned char length[4]; | |
121 | unsigned char encoding[4]; | |
965b60c9 | 122 | unsigned char personality[8]; |
167e1c1f TG |
123 | unsigned char lsda[8]; |
124 | }; | |
125 | ||
126 | /* Header in images (in __TEXT,__unwind_info). */ | |
127 | ||
128 | #define MACH_O_UNWIND_SECTION_VERSION 1 /* Current verion in header. */ | |
129 | struct mach_o_unwind_info_header | |
130 | { | |
131 | unsigned char version[4]; /* Currently MACH_O_UNWIND_SECTION_VERSION. */ | |
132 | unsigned char encodings_array_offset[4]; | |
133 | unsigned char encodings_array_count[4]; | |
134 | unsigned char personality_array_offset[4]; | |
135 | unsigned char personality_array_count[4]; | |
136 | unsigned char index_offset[4]; | |
137 | unsigned char index_count[4]; | |
138 | /* Followed by: | |
139 | - encodings array | |
140 | These are the encodings shared, for index < encoding_array_count | |
141 | - personality array | |
142 | count given by personality_array_count | |
143 | - index entries | |
144 | count given by index_count | |
145 | - lsda index entries | |
146 | last offset given by lsda offset of last index_entry. | |
147 | */ | |
148 | }; | |
149 | ||
150 | struct mach_o_unwind_index_entry | |
151 | { | |
152 | unsigned char function_offset[4]; | |
153 | unsigned char second_level_offset[4]; | |
154 | unsigned char lsda_index_offset[4]; | |
155 | }; | |
156 | ||
157 | struct mach_o_unwind_lsda_index_entry | |
158 | { | |
159 | unsigned char function_offset[4]; | |
160 | unsigned char lsda_offset[4]; | |
161 | }; | |
162 | ||
163 | /* Second level index pages. */ | |
164 | ||
165 | #define MACH_O_UNWIND_SECOND_LEVEL_REGULAR 2 | |
166 | struct mach_o_unwind_regular_second_level_page_header | |
167 | { | |
168 | unsigned char kind[4]; | |
169 | unsigned char entry_page_offset[2]; | |
170 | unsigned char entry_count[2]; | |
171 | /* Array of entries. */ | |
172 | }; | |
173 | ||
174 | struct mach_o_unwind_regular_second_level_entry | |
175 | { | |
176 | unsigned char function_offset[4]; | |
177 | unsigned char encoding[4]; | |
178 | }; | |
179 | ||
180 | #define MACH_O_UNWIND_SECOND_LEVEL_COMPRESSED 3 | |
181 | struct mach_o_unwind_compressed_second_level_page_header | |
182 | { | |
183 | unsigned char kind[4]; | |
184 | unsigned char entry_page_offset[2]; | |
185 | unsigned char entry_count[2]; | |
186 | unsigned char encodings_offset[2]; | |
187 | unsigned char encodings_count[2]; | |
188 | /* Followed by entries array (one word, see below). */ | |
189 | /* Followed by (non-common) encodings array. */ | |
190 | }; | |
191 | ||
192 | /* Compressed entries are one word, containing function offset and encoding | |
193 | index. */ | |
194 | #define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(en) \ | |
195 | ((en) & 0x00FFFFFF) | |
196 | #define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(en) \ | |
197 | (((en) >> 24) & 0xFF) | |
198 | ||
199 | #endif /* _MACH_O_UNWIND_H */ |