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  1. /* dw2gencfi.h - Support for generating Dwarf2 CFI information.
  2.    Copyright (C) 2003-2015 Free Software Foundation, Inc.
  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
  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.