gcc/config/arm/unwind-arm.h

   1 /* Header file for the ARM EABI unwinder
   2    Copyright (C) 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
   3    Contributed by Paul Brook
   4
   5    This file is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 2, or (at your option) any
   8    later version.
   9
  10    In addition to the permissions in the GNU General Public License, the
  11    Free Software Foundation gives you unlimited permission to link the
  12    compiled version of this file into combinations with other programs,
  13    and to distribute those combinations without any restriction coming
  14    from the use of this file.  (The General Public License restrictions
  15    do apply in other respects; for example, they cover modification of
  16    the file, and distribution when not linked into a combine
  17    executable.)
  18
  19    This file is distributed in the hope that it will be useful, but
  20    WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22    General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program; see the file COPYING.  If not, write to
  26    the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  27    Boston, MA 02110-1301, USA.  */
  28
  29 /* Language-independent unwinder header public defines.  This contains both
  30    ABI defined objects, and GNU support routines.  */
  31
  32 #ifndef UNWIND_ARM_H
  33 #define UNWIND_ARM_H
  34
  35 #define __ARM_EABI_UNWINDER__ 1
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40   typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
  41   typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
  42   typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
  43   typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
  44   typedef _Unwind_Word _uw;
  45   typedef unsigned _uw64 __attribute__((mode(__DI__)));
  46   typedef unsigned _uw16 __attribute__((mode(__HI__)));
  47   typedef unsigned _uw8 __attribute__((mode(__QI__)));
  48
  49   typedef enum
  50     {
  51       _URC_OK = 0,       /* operation completed successfully */
  52       _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
  53       _URC_END_OF_STACK = 5,
  54       _URC_HANDLER_FOUND = 6,
  55       _URC_INSTALL_CONTEXT = 7,
  56       _URC_CONTINUE_UNWIND = 8,
  57       _URC_FAILURE = 9   /* unspecified failure of some kind */
  58     }
  59   _Unwind_Reason_Code;
  60
  61   typedef enum
  62     {
  63       _US_VIRTUAL_UNWIND_FRAME = 0,
  64       _US_UNWIND_FRAME_STARTING = 1,
  65       _US_UNWIND_FRAME_RESUME = 2,
  66       _US_ACTION_MASK = 3,
  67       _US_FORCE_UNWIND = 8,
  68       _US_END_OF_STACK = 16
  69     }
  70   _Unwind_State;
  71
  72   /* Provided only for for compatibility with existing code.  */
  73   typedef int _Unwind_Action;
  74 #define _UA_SEARCH_PHASE        1
  75 #define _UA_CLEANUP_PHASE       2
  76 #define _UA_HANDLER_FRAME       4
  77 #define _UA_FORCE_UNWIND        8
  78 #define _UA_END_OF_STACK        16
  79 #define _URC_NO_REASON  _URC_OK
  80
  81   typedef struct _Unwind_Control_Block _Unwind_Control_Block;
  82   typedef struct _Unwind_Context _Unwind_Context;
  83   typedef _uw _Unwind_EHT_Header;
  84
  85
  86   /* UCB: */
  87
  88   struct _Unwind_Control_Block
  89     {
  90       char exception_class[8];
  91       void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
  92       /* Unwinder cache, private fields for the unwinder's use */
  93       struct
  94         {
  95           _uw reserved1;  /* Forced unwind stop fn, 0 if not forced */
  96           _uw reserved2;  /* Personality routine address */
  97           _uw reserved3;  /* Saved callsite address */
  98           _uw reserved4;  /* Forced unwind stop arg */
  99           _uw reserved5;
 100         }
 101       unwinder_cache;
 102       /* Propagation barrier cache (valid after phase 1): */
 103       struct
 104         {
 105           _uw sp;
 106           _uw bitpattern[5];
 107         }
 108       barrier_cache;
 109       /* Cleanup cache (preserved over cleanup): */
 110       struct
 111         {
 112           _uw bitpattern[4];
 113         }
 114       cleanup_cache;
 115       /* Pr cache (for pr's benefit): */
 116       struct
 117         {
 118           _uw fnstart;                  /* function start address */
 119           _Unwind_EHT_Header *ehtp;     /* pointer to EHT entry header word */
 120           _uw additional;               /* additional data */
 121           _uw reserved1;
 122         }
 123       pr_cache;
 124       long long int :0; /* Force alignment to 8-byte boundary */
 125     };
 126
 127   /* Virtual Register Set*/
 128
 129   typedef enum
 130     {
 131       _UVRSC_CORE = 0,      /* integer register */
 132       _UVRSC_VFP = 1,       /* vfp */
 133       _UVRSC_FPA = 2,       /* fpa */
 134       _UVRSC_WMMXD = 3,     /* Intel WMMX data register */
 135       _UVRSC_WMMXC = 4      /* Intel WMMX control register */
 136     }
 137   _Unwind_VRS_RegClass;
 138
 139   typedef enum
 140     {
 141       _UVRSD_UINT32 = 0,
 142       _UVRSD_VFPX = 1,
 143       _UVRSD_FPAX = 2,
 144       _UVRSD_UINT64 = 3,
 145       _UVRSD_FLOAT = 4,
 146       _UVRSD_DOUBLE = 5
 147     }
 148   _Unwind_VRS_DataRepresentation;
 149
 150   typedef enum
 151     {
 152       _UVRSR_OK = 0,
 153       _UVRSR_NOT_IMPLEMENTED = 1,
 154       _UVRSR_FAILED = 2
 155     }
 156   _Unwind_VRS_Result;
 157
 158   /* Frame unwinding state.  */
 159   typedef struct
 160     {
 161       /* The current word (bytes packed msb first).  */
 162       _uw data;
 163       /* Pointer to the next word of data.  */
 164       _uw *next;
 165       /* The number of bytes left in this word.  */
 166       _uw8 bytes_left;
 167       /* The number of words pointed to by ptr.  */
 168       _uw8 words_left;
 169     }
 170   __gnu_unwind_state;
 171
 172   typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
 173       _Unwind_Control_Block *, _Unwind_Context *);
 174
 175   _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,
 176                                      _uw, _Unwind_VRS_DataRepresentation,
 177                                      void *);
 178
 179   _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,
 180                                      _uw, _Unwind_VRS_DataRepresentation,
 181                                      void *);
 182
 183   _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,
 184                                      _uw, _Unwind_VRS_DataRepresentation);
 185
 186
 187   /* Support functions for the PR.  */
 188 #define _Unwind_Exception _Unwind_Control_Block
 189   typedef char _Unwind_Exception_Class[8];
 190
 191   void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
 192   _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
 193
 194   /* These two should never be used.  */
 195   _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);
 196   _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);
 197
 198   /* Interface functions: */
 199   _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp);
 200   void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp);
 201   _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp);
 202
 203   typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
 204        (int, _Unwind_Action, _Unwind_Exception_Class,
 205         _Unwind_Control_Block *, struct _Unwind_Context *, void *);
 206   _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
 207                                             _Unwind_Stop_Fn, void *);
 208   _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
 209   void _Unwind_Complete(_Unwind_Control_Block *ucbp);
 210   void _Unwind_DeleteException (_Unwind_Exception *);
 211
 212   _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,
 213                                           _Unwind_Context *);
 214   _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,
 215                                             __gnu_unwind_state *);
 216
 217   /* Decode an R_ARM_TARGET2 relocation.  */
 218   static inline _Unwind_Word
 219   _Unwind_decode_target2 (_Unwind_Word ptr)
 220     {
 221       _Unwind_Word tmp;
 222
 223       tmp = *(_Unwind_Word *) ptr;
 224       /* Zero values are always NULL.  */
 225       if (!tmp)
 226         return 0;
 227
 228 #if defined(linux) || defined(__NetBSD__)
 229       /* Pc-relative indirect.  */
 230       tmp += ptr;
 231       tmp = *(_Unwind_Word *) tmp;
 232 #elif defined(__symbian__)
 233       /* Absolute pointer.  Nothing more to do.  */
 234 #else
 235       /* Pc-relative pointer.  */
 236       tmp += ptr;
 237 #endif
 238       return tmp;
 239     }
 240
 241   static inline _Unwind_Word
 242   _Unwind_GetGR (_Unwind_Context *context, int regno)
 243     {
 244       _uw val;
 245       _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
 246       return val;
 247     }
 248
 249   /* Return the address of the instruction, not the actual IP value.  */
 250 #define _Unwind_GetIP(context) \
 251   (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
 252
 253 #define _Unwind_GetIPInfo(context, ip_before_insn) \
 254   (*ip_before_insn = 0, _Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
 255
 256   static inline void
 257   _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)
 258     {
 259       _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
 260     }
 261
 262   /* The dwarf unwinder doesn't understand arm/thumb state.  We assume the
 263      landing pad uses the same instruction set as the call site.  */
 264 #define _Unwind_SetIP(context, val) \
 265   _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
 266
 267 #ifdef __cplusplus
 268 }   /* extern "C" */
 269 #endif
 270
 271 #endif /* defined UNWIND_ARM_H */