gas/dw2gencfi.h

   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 */