1 /* dw2gencfi.h - Support for generating Dwarf2 CFI information. 2 Copyright (C) 2003-2016 Free Software Foundation, Inc. 3 Contributed by Michal Ludvig <mludvig (at) 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 9 the Free Software Foundation; either version 3, or (at your option) 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 19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 20 02110-1301, USA. */ 21 22 #ifndef DW2GENCFI_H 23 #define DW2GENCFI_H 24 25 #include "dwarf2.h" 26 27 struct symbol; 28 29 extern const pseudo_typeS cfi_pseudo_table[]; 30 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); 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); 39 extern void cfi_set_sections (void); 40 extern void cfi_add_advance_loc (struct symbol *); 41 extern void cfi_add_label (const char *); 42 43 extern void cfi_add_CFA_offset (unsigned, offsetT); 44 extern void cfi_add_CFA_def_cfa (unsigned, offsetT); 45 extern void cfi_add_CFA_register (unsigned, unsigned); 46 extern void cfi_add_CFA_def_cfa_register (unsigned); 47 extern void cfi_add_CFA_def_cfa_offset (offsetT); 48 extern void cfi_add_CFA_restore (unsigned); 49 extern void cfi_add_CFA_undefined (unsigned); 50 extern void cfi_add_CFA_same_value (unsigned); 51 extern void cfi_add_CFA_remember_state (void); 52 extern void cfi_add_CFA_restore_state (void); 53 54 /* Structures for md_cfi_end. */ 55 56 #if defined (TE_PE) || defined (TE_PEP) 57 #define SUPPORT_FRAME_LINKONCE 1 58 #else 59 #define SUPPORT_FRAME_LINKONCE 0 60 #endif 61 62 #ifdef tc_cfi_reloc_for_encoding 63 #define SUPPORT_COMPACT_EH 1 64 #else 65 #define SUPPORT_COMPACT_EH 0 66 #endif 67 68 #define MULTIPLE_FRAME_SECTIONS (SUPPORT_FRAME_LINKONCE || SUPPORT_COMPACT_EH) 69 70 struct cfi_insn_data 71 { 72 struct cfi_insn_data *next; 73 #if MULTIPLE_FRAME_SECTIONS 74 segT cur_seg; 75 #endif 76 int insn; 77 union 78 { 79 struct 80 { 81 unsigned reg; 82 offsetT offset; 83 } ri; 84 85 struct 86 { 87 unsigned reg1; 88 unsigned reg2; 89 } rr; 90 91 unsigned r; 92 offsetT i; 93 94 struct 95 { 96 symbolS *lab1; 97 symbolS *lab2; 98 } ll; 99 100 struct cfi_escape_data *esc; 101 102 struct 103 { 104 unsigned reg, encoding; 105 expressionS exp; 106 } ea; 107 108 const char *sym_name; 109 } u; 110 }; 111 112 /* An enumeration describing the Compact EH header format. The least 113 significant bit is used to distinguish the entries. 114 115 Inline Compact: Function offset [0] 116 Four chars of unwind data. 117 Out-of-line Compact: Function offset [1] 118 Compact unwind data offset [0] 119 Legacy: Function offset [1] 120 Unwind data offset [1] 121 122 The header type is initialized to EH_COMPACT_UNKNOWN until the 123 format is discovered by encountering a .fde_data entry. 124 Failure to find a .fde_data entry will cause an EH_COMPACT_LEGACY 125 header to be generated. */ 126 127 enum { 128 EH_COMPACT_UNKNOWN, 129 EH_COMPACT_LEGACY, 130 EH_COMPACT_INLINE, 131 EH_COMPACT_OUTLINE, 132 EH_COMPACT_OUTLINE_DONE, 133 /* Outline if .cfi_inline_lsda used, otherwise legacy FDE. */ 134 EH_COMPACT_HAS_LSDA 135 }; 136 137 struct fde_entry 138 { 139 struct fde_entry *next; 140 #if MULTIPLE_FRAME_SECTIONS 141 segT cur_seg; 142 #endif 143 symbolS *start_address; 144 symbolS *end_address; 145 struct cfi_insn_data *data; 146 struct cfi_insn_data **last; 147 unsigned char per_encoding; 148 unsigned char lsda_encoding; 149 int personality_id; 150 expressionS personality; 151 expressionS lsda; 152 unsigned int return_column; 153 unsigned int signal_frame; 154 #if MULTIPLE_FRAME_SECTIONS 155 int handled; 156 #endif 157 int eh_header_type; 158 /* Compact unwinding opcodes, not including the PR byte or LSDA. */ 159 int eh_data_size; 160 bfd_byte *eh_data; 161 /* For out of line tables and FDEs. */ 162 symbolS *eh_loc; 163 int sections; 164 }; 165 166 /* The list of all FDEs that have been collected. */ 167 extern struct fde_entry *all_fde_data; 168 169 /* Fake CFI type; outside the byte range of any real CFI insn. */ 170 #define CFI_adjust_cfa_offset 0x100 171 #define CFI_return_column 0x101 172 #define CFI_rel_offset 0x102 173 #define CFI_escape 0x103 174 #define CFI_signal_frame 0x104 175 #define CFI_val_encoded_addr 0x105 176 #define CFI_label 0x106 177 178 /* By default emit .eh_frame only, not .debug_frame. */ 179 #define CFI_EMIT_eh_frame (1 << 0) 180 #define CFI_EMIT_debug_frame (1 << 1) 181 #define CFI_EMIT_target (1 << 2) 182 #define CFI_EMIT_eh_frame_compact (1 << 3) 183 184 #endif /* DW2GENCFI_H */ 185
