1 /* dw2gencfi.h - Support for generating Dwarf2 CFI information.
2 Copyright (C) 2003-2018 Free Software Foundation, Inc.
3 Contributed by Michal Ludvig <mludvig@suse.cz>
5 This file is part of GAS, the GNU Assembler.
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
9 the Free Software Foundation; either version 3, or (at your option)
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.
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
19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
29 extern const pseudo_typeS cfi_pseudo_table[];
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. */
33 extern void cfi_finish (void);
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);
39 extern void cfi_set_sections (void);
40 extern void cfi_add_advance_loc (struct symbol *);
41 extern void cfi_add_label (const char *);
43 extern void cfi_add_CFA_offset (unsigned, offsetT);
44 extern void cfi_add_CFA_val_offset (unsigned, offsetT);
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);
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);
55 /* Structures for md_cfi_end. */
57 #if defined (TE_PE) || defined (TE_PEP)
58 #define SUPPORT_FRAME_LINKONCE 1
60 #define SUPPORT_FRAME_LINKONCE 0
63 #ifdef tc_cfi_reloc_for_encoding
64 #define SUPPORT_COMPACT_EH 1
66 #define SUPPORT_COMPACT_EH 0
69 #define MULTIPLE_FRAME_SECTIONS (SUPPORT_FRAME_LINKONCE || SUPPORT_COMPACT_EH)
73 struct cfi_insn_data *next;
74 #if MULTIPLE_FRAME_SECTIONS
101 struct cfi_escape_data *esc;
105 unsigned reg, encoding;
109 const char *sym_name;
113 /* An enumeration describing the Compact EH header format. The least
114 significant bit is used to distinguish the entries.
116 Inline Compact: Function offset [0]
117 Four chars of unwind data.
118 Out-of-line Compact: Function offset [1]
119 Compact unwind data offset [0]
120 Legacy: Function offset [1]
121 Unwind data offset [1]
123 The header type is initialized to EH_COMPACT_UNKNOWN until the
124 format is discovered by encountering a .fde_data entry.
125 Failure to find a .fde_data entry will cause an EH_COMPACT_LEGACY
126 header to be generated. */
133 EH_COMPACT_OUTLINE_DONE,
134 /* Outline if .cfi_inline_lsda used, otherwise legacy FDE. */
140 struct fde_entry *next;
141 #if MULTIPLE_FRAME_SECTIONS
144 symbolS *start_address;
145 symbolS *end_address;
146 struct cfi_insn_data *data;
147 struct cfi_insn_data **last;
148 unsigned char per_encoding;
149 unsigned char lsda_encoding;
151 expressionS personality;
153 unsigned int return_column;
154 unsigned int signal_frame;
155 #if MULTIPLE_FRAME_SECTIONS
159 /* Compact unwinding opcodes, not including the PR byte or LSDA. */
162 /* For out of line tables and FDEs. */
167 /* The list of all FDEs that have been collected. */
168 extern struct fde_entry *all_fde_data;
170 /* Fake CFI type; outside the byte range of any real CFI insn. */
171 #define CFI_adjust_cfa_offset 0x100
172 #define CFI_return_column 0x101
173 #define CFI_rel_offset 0x102
174 #define CFI_escape 0x103
175 #define CFI_signal_frame 0x104
176 #define CFI_val_encoded_addr 0x105
177 #define CFI_label 0x106
179 /* By default emit .eh_frame only, not .debug_frame. */
180 #define CFI_EMIT_eh_frame (1 << 0)
181 #define CFI_EMIT_debug_frame (1 << 1)
182 #define CFI_EMIT_target (1 << 2)
183 #define CFI_EMIT_eh_frame_compact (1 << 3)
185 #endif /* DW2GENCFI_H */