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54cfded0 | 1 | /* dw2gencfi.h - Support for generating Dwarf2 CFI information. |
a2c58332 | 2 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
54cfded0 AM |
3 | Contributed by Michal Ludvig <mludvig@suse.cz> |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
ec2655a6 | 9 | the Free Software Foundation; either version 3, or (at your option) |
54cfded0 AM |
10 | any later version. |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
54cfded0 AM |
21 | |
22 | #ifndef DW2GENCFI_H | |
23 | #define DW2GENCFI_H | |
24 | ||
fa8f86ff | 25 | #include "dwarf2.h" |
54cfded0 | 26 | |
a4447b93 | 27 | struct symbol; |
54cfded0 AM |
28 | |
29 | extern const pseudo_typeS cfi_pseudo_table[]; | |
30 | ||
54cfded0 AM |
31 | /* cfi_finish() is called at the end of file. It will complain if |
32 | the last CFI wasn't properly closed by .cfi_endproc. */ | |
a4447b93 RH |
33 | extern void cfi_finish (void); |
34 | ||
35 | /* Entry points for backends to add unwind information. */ | |
36 | extern void cfi_new_fde (struct symbol *); | |
37 | extern void cfi_end_fde (struct symbol *); | |
38 | extern void cfi_set_return_column (unsigned); | |
2f0c68f2 | 39 | extern void cfi_set_sections (void); |
a4447b93 | 40 | extern void cfi_add_advance_loc (struct symbol *); |
69602580 | 41 | extern void cfi_add_label (const char *); |
2be24b54 | 42 | |
a4447b93 | 43 | extern void cfi_add_CFA_offset (unsigned, offsetT); |
084303b8 | 44 | extern void cfi_add_CFA_val_offset (unsigned, offsetT); |
a4447b93 RH |
45 | extern void cfi_add_CFA_def_cfa (unsigned, offsetT); |
46 | extern void cfi_add_CFA_register (unsigned, unsigned); | |
47 | extern void cfi_add_CFA_def_cfa_register (unsigned); | |
48 | extern void cfi_add_CFA_def_cfa_offset (offsetT); | |
2be24b54 ML |
49 | extern void cfi_add_CFA_restore (unsigned); |
50 | extern void cfi_add_CFA_undefined (unsigned); | |
51 | extern void cfi_add_CFA_same_value (unsigned); | |
52 | extern void cfi_add_CFA_remember_state (void); | |
53 | extern void cfi_add_CFA_restore_state (void); | |
54cfded0 | 54 | |
1bce6bd8 PB |
55 | /* Structures for md_cfi_end. */ |
56 | ||
57 | #if defined (TE_PE) || defined (TE_PEP) | |
58 | #define SUPPORT_FRAME_LINKONCE 1 | |
59 | #else | |
60 | #define SUPPORT_FRAME_LINKONCE 0 | |
61 | #endif | |
62 | ||
2f0c68f2 CM |
63 | #ifdef tc_cfi_reloc_for_encoding |
64 | #define SUPPORT_COMPACT_EH 1 | |
65 | #else | |
66 | #define SUPPORT_COMPACT_EH 0 | |
67 | #endif | |
68 | ||
853ba678 J |
69 | #ifndef TARGET_MULTIPLE_EH_FRAME_SECTIONS |
70 | #define TARGET_MULTIPLE_EH_FRAME_SECTIONS 0 | |
71 | #endif | |
72 | ||
73 | #define MULTIPLE_FRAME_SECTIONS (SUPPORT_FRAME_LINKONCE || SUPPORT_COMPACT_EH \ | |
74 | || TARGET_MULTIPLE_EH_FRAME_SECTIONS) | |
2f0c68f2 | 75 | |
1bce6bd8 PB |
76 | struct cfi_insn_data |
77 | { | |
78 | struct cfi_insn_data *next; | |
2f0c68f2 | 79 | #if MULTIPLE_FRAME_SECTIONS |
1bce6bd8 PB |
80 | segT cur_seg; |
81 | #endif | |
82 | int insn; | |
83 | union | |
84 | { | |
85 | struct | |
86 | { | |
87 | unsigned reg; | |
88 | offsetT offset; | |
89 | } ri; | |
90 | ||
91 | struct | |
92 | { | |
93 | unsigned reg1; | |
94 | unsigned reg2; | |
95 | } rr; | |
96 | ||
97 | unsigned r; | |
98 | offsetT i; | |
99 | ||
100 | struct | |
101 | { | |
102 | symbolS *lab1; | |
103 | symbolS *lab2; | |
104 | } ll; | |
105 | ||
106 | struct cfi_escape_data *esc; | |
107 | ||
108 | struct | |
109 | { | |
110 | unsigned reg, encoding; | |
111 | expressionS exp; | |
112 | } ea; | |
69602580 JB |
113 | |
114 | const char *sym_name; | |
1bce6bd8 PB |
115 | } u; |
116 | }; | |
117 | ||
2f0c68f2 CM |
118 | /* An enumeration describing the Compact EH header format. The least |
119 | significant bit is used to distinguish the entries. | |
120 | ||
121 | Inline Compact: Function offset [0] | |
122 | Four chars of unwind data. | |
123 | Out-of-line Compact: Function offset [1] | |
124 | Compact unwind data offset [0] | |
125 | Legacy: Function offset [1] | |
126 | Unwind data offset [1] | |
127 | ||
128 | The header type is initialized to EH_COMPACT_UNKNOWN until the | |
129 | format is discovered by encountering a .fde_data entry. | |
130 | Failure to find a .fde_data entry will cause an EH_COMPACT_LEGACY | |
131 | header to be generated. */ | |
132 | ||
133 | enum { | |
134 | EH_COMPACT_UNKNOWN, | |
135 | EH_COMPACT_LEGACY, | |
136 | EH_COMPACT_INLINE, | |
137 | EH_COMPACT_OUTLINE, | |
138 | EH_COMPACT_OUTLINE_DONE, | |
139 | /* Outline if .cfi_inline_lsda used, otherwise legacy FDE. */ | |
140 | EH_COMPACT_HAS_LSDA | |
141 | }; | |
142 | ||
3a67e1a6 ST |
143 | /* Stack of old CFI data, for save/restore. */ |
144 | struct cfa_save_data | |
145 | { | |
146 | struct cfa_save_data *next; | |
147 | offsetT cfa_offset; | |
148 | }; | |
149 | ||
150 | /* Current open FDE entry. */ | |
151 | struct frch_cfi_data | |
152 | { | |
153 | struct fde_entry *cur_fde_data; | |
154 | symbolS *last_address; | |
155 | offsetT cur_cfa_offset; | |
156 | struct cfa_save_data *cfa_save_stack; | |
157 | }; | |
158 | ||
1bce6bd8 PB |
159 | struct fde_entry |
160 | { | |
161 | struct fde_entry *next; | |
2f0c68f2 | 162 | #if MULTIPLE_FRAME_SECTIONS |
1bce6bd8 PB |
163 | segT cur_seg; |
164 | #endif | |
165 | symbolS *start_address; | |
166 | symbolS *end_address; | |
167 | struct cfi_insn_data *data; | |
168 | struct cfi_insn_data **last; | |
169 | unsigned char per_encoding; | |
170 | unsigned char lsda_encoding; | |
2f0c68f2 | 171 | int personality_id; |
1bce6bd8 PB |
172 | expressionS personality; |
173 | expressionS lsda; | |
174 | unsigned int return_column; | |
175 | unsigned int signal_frame; | |
2f0c68f2 | 176 | #if MULTIPLE_FRAME_SECTIONS |
1bce6bd8 PB |
177 | int handled; |
178 | #endif | |
2f0c68f2 CM |
179 | int eh_header_type; |
180 | /* Compact unwinding opcodes, not including the PR byte or LSDA. */ | |
181 | int eh_data_size; | |
182 | bfd_byte *eh_data; | |
183 | /* For out of line tables and FDEs. */ | |
184 | symbolS *eh_loc; | |
185 | int sections; | |
09038062 ST |
186 | #ifdef tc_fde_entry_extras |
187 | tc_fde_entry_extras | |
188 | #endif | |
1bce6bd8 PB |
189 | }; |
190 | ||
af385746 RH |
191 | /* The list of all FDEs that have been collected. */ |
192 | extern struct fde_entry *all_fde_data; | |
193 | ||
1bce6bd8 PB |
194 | /* Fake CFI type; outside the byte range of any real CFI insn. */ |
195 | #define CFI_adjust_cfa_offset 0x100 | |
196 | #define CFI_return_column 0x101 | |
197 | #define CFI_rel_offset 0x102 | |
198 | #define CFI_escape 0x103 | |
199 | #define CFI_signal_frame 0x104 | |
200 | #define CFI_val_encoded_addr 0x105 | |
69602580 | 201 | #define CFI_label 0x106 |
1bce6bd8 | 202 | |
2f0c68f2 CM |
203 | /* By default emit .eh_frame only, not .debug_frame. */ |
204 | #define CFI_EMIT_eh_frame (1 << 0) | |
205 | #define CFI_EMIT_debug_frame (1 << 1) | |
206 | #define CFI_EMIT_target (1 << 2) | |
207 | #define CFI_EMIT_eh_frame_compact (1 << 3) | |
b52c4ee4 | 208 | #define CFI_EMIT_sframe (1 << 4) |
2f0c68f2 | 209 | |
54cfded0 | 210 | #endif /* DW2GENCFI_H */ |