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  1. /* dw2gencfi.h - Support for generating Dwarf2 CFI information.
  2.    Copyright 2003, 2004, 2005, 2007, 2009 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_add_advance_loc (struct symbol *);
  40.  
  41. extern void cfi_add_CFA_offset (unsigned, offsetT);
  42. extern void cfi_add_CFA_def_cfa (unsigned, offsetT);
  43. extern void cfi_add_CFA_register (unsigned, unsigned);
  44. extern void cfi_add_CFA_def_cfa_register (unsigned);
  45. extern void cfi_add_CFA_def_cfa_offset (offsetT);
  46. extern void cfi_add_CFA_restore (unsigned);
  47. extern void cfi_add_CFA_undefined (unsigned);
  48. extern void cfi_add_CFA_same_value (unsigned);
  49. extern void cfi_add_CFA_remember_state (void);
  50. extern void cfi_add_CFA_restore_state (void);
  51.  
  52. /* Structures for md_cfi_end.  */
  53.  
  54. #if defined (TE_PE) || defined (TE_PEP)
  55. #define SUPPORT_FRAME_LINKONCE 1
  56. #else
  57. #define SUPPORT_FRAME_LINKONCE 0
  58. #endif
  59.  
  60. struct cfi_insn_data
  61. {
  62.   struct cfi_insn_data *next;
  63. #if SUPPORT_FRAME_LINKONCE
  64.   segT cur_seg;
  65. #endif
  66.   int insn;
  67.   union
  68.   {
  69.     struct
  70.     {
  71.       unsigned reg;
  72.       offsetT offset;
  73.     } ri;
  74.  
  75.     struct
  76.     {
  77.       unsigned reg1;
  78.       unsigned reg2;
  79.     } rr;
  80.  
  81.     unsigned r;
  82.     offsetT i;
  83.  
  84.     struct
  85.     {
  86.       symbolS *lab1;
  87.       symbolS *lab2;
  88.     } ll;
  89.  
  90.     struct cfi_escape_data *esc;
  91.  
  92.     struct
  93.     {
  94.       unsigned reg, encoding;
  95.       expressionS exp;
  96.     } ea;
  97.   } u;
  98. };
  99.  
  100. struct fde_entry
  101. {
  102.   struct fde_entry *next;
  103. #if SUPPORT_FRAME_LINKONCE
  104.   segT cur_seg;
  105. #endif
  106.   symbolS *start_address;
  107.   symbolS *end_address;
  108.   struct cfi_insn_data *data;
  109.   struct cfi_insn_data **last;
  110.   unsigned char per_encoding;
  111.   unsigned char lsda_encoding;
  112.   expressionS personality;
  113.   expressionS lsda;
  114.   unsigned int return_column;
  115.   unsigned int signal_frame;
  116. #if SUPPORT_FRAME_LINKONCE
  117.   int handled;
  118. #endif
  119. };
  120.  
  121. /* The list of all FDEs that have been collected.  */
  122. extern struct fde_entry *all_fde_data;
  123.  
  124. /* Fake CFI type; outside the byte range of any real CFI insn.  */
  125. #define CFI_adjust_cfa_offset   0x100
  126. #define CFI_return_column       0x101
  127. #define CFI_rel_offset          0x102
  128. #define CFI_escape              0x103
  129. #define CFI_signal_frame        0x104
  130. #define CFI_val_encoded_addr    0x105
  131.  
  132. #endif /* DW2GENCFI_H */
  133.