gcc/ginclude/unwind-arm-common.h

   1 /* Header file for the ARM EABI and C6X unwinders
   2    Copyright (C) 2003-2021 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 3, or (at your option) any
   8    later version.
   9
  10    This file is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    General Public License for more details.
  14
  15    Under Section 7 of GPL version 3, you are granted additional
  16    permissions described in the GCC Runtime Library Exception, version
  17    3.1, as published by the Free Software Foundation.
  18
  19    You should have received a copy of the GNU General Public License and
  20    a copy of the GCC Runtime Library Exception along with this program;
  21    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 /* Language-independent unwinder header public defines.  This contains both
  25    ABI defined objects, and GNU support routines.  */
  26
  27 #ifndef UNWIND_ARM_COMMON_H
  28 #define UNWIND_ARM_COMMON_H
  29
  30 #define __ARM_EABI_UNWINDER__ 1
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35   typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
  36   typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
  37   typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
  38   typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
  39   typedef _Unwind_Word _uw;
  40   typedef unsigned _uw64 __attribute__((mode(__DI__)));
  41   typedef unsigned _uw16 __attribute__((mode(__HI__)));
  42   typedef unsigned _uw8 __attribute__((mode(__QI__)));
  43
  44   typedef enum
  45     {
  46       _URC_OK = 0,       /* operation completed successfully */
  47       _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
  48       _URC_END_OF_STACK = 5,
  49       _URC_HANDLER_FOUND = 6,
  50       _URC_INSTALL_CONTEXT = 7,
  51       _URC_CONTINUE_UNWIND = 8,
  52       _URC_FAILURE = 9   /* unspecified failure of some kind */
  53     }
  54   _Unwind_Reason_Code;
  55
  56   typedef enum
  57     {
  58       _US_VIRTUAL_UNWIND_FRAME = 0,
  59       _US_UNWIND_FRAME_STARTING = 1,
  60       _US_UNWIND_FRAME_RESUME = 2,
  61       _US_ACTION_MASK = 3,
  62       _US_FORCE_UNWIND = 8,
  63       _US_END_OF_STACK = 16
  64     }
  65   _Unwind_State;
  66
  67   /* Provided only for compatibility with existing code.  */
  68   typedef int _Unwind_Action;
  69 #define _UA_SEARCH_PHASE        1
  70 #define _UA_CLEANUP_PHASE       2
  71 #define _UA_HANDLER_FRAME       4
  72 #define _UA_FORCE_UNWIND        8
  73 #define _UA_END_OF_STACK        16
  74 #define _URC_NO_REASON  _URC_OK
  75
  76   typedef struct _Unwind_Control_Block _Unwind_Control_Block;
  77   typedef struct _Unwind_Context _Unwind_Context;
  78   typedef _uw _Unwind_EHT_Header;
  79
  80
  81   /* UCB: */
  82
  83   struct _Unwind_Control_Block
  84     {
  85       char exception_class[8];
  86       void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
  87       /* Unwinder cache, private fields for the unwinder's use */
  88       struct
  89         {
  90           _uw reserved1;  /* Forced unwind stop fn, 0 if not forced */
  91           _uw reserved2;  /* Personality routine address */
  92           _uw reserved3;  /* Saved callsite address */
  93           _uw reserved4;  /* Forced unwind stop arg */
  94           _uw reserved5;  /* Personality routine GOT value in FDPIC mode.  */
  95         }
  96       unwinder_cache;
  97       /* Propagation barrier cache (valid after phase 1): */
  98       struct
  99         {
 100           _uw sp;
 101           _uw bitpattern[5];
 102         }
 103       barrier_cache;
 104       /* Cleanup cache (preserved over cleanup): */
 105       struct
 106         {
 107           _uw bitpattern[4];
 108         }
 109       cleanup_cache;
 110       /* Pr cache (for pr's benefit): */
 111       struct
 112         {
 113           _uw fnstart;                  /* function start address */
 114           _Unwind_EHT_Header *ehtp;     /* pointer to EHT entry header word */
 115           _uw additional;               /* additional data */
 116           _uw reserved1;
 117         }
 118       pr_cache;
 119       long long int :0; /* Force alignment to 8-byte boundary */
 120     };
 121
 122   /* Virtual Register Set*/
 123
 124   typedef enum
 125     {
 126       _UVRSC_CORE = 0,      /* integer register */
 127       _UVRSC_VFP = 1,       /* vfp */
 128       _UVRSC_FPA = 2,       /* fpa */
 129       _UVRSC_WMMXD = 3,     /* Intel WMMX data register */
 130       _UVRSC_WMMXC = 4      /* Intel WMMX control register */
 131     }
 132   _Unwind_VRS_RegClass;
 133
 134   typedef enum
 135     {
 136       _UVRSD_UINT32 = 0,
 137       _UVRSD_VFPX = 1,
 138       _UVRSD_FPAX = 2,
 139       _UVRSD_UINT64 = 3,
 140       _UVRSD_FLOAT = 4,
 141       _UVRSD_DOUBLE = 5
 142     }
 143   _Unwind_VRS_DataRepresentation;
 144
 145   typedef enum
 146     {
 147       _UVRSR_OK = 0,
 148       _UVRSR_NOT_IMPLEMENTED = 1,
 149       _UVRSR_FAILED = 2
 150     }
 151   _Unwind_VRS_Result;
 152
 153   /* Frame unwinding state.  */
 154   typedef struct
 155     {
 156       /* The current word (bytes packed msb first).  */
 157       _uw data;
 158       /* Pointer to the next word of data.  */
 159       _uw *next;
 160       /* The number of bytes left in this word.  */
 161       _uw8 bytes_left;
 162       /* The number of words pointed to by ptr.  */
 163       _uw8 words_left;
 164     }
 165   __gnu_unwind_state;
 166
 167   typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
 168       _Unwind_Control_Block *, _Unwind_Context *);
 169
 170   _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,
 171                                      _uw, _Unwind_VRS_DataRepresentation,
 172                                      void *);
 173
 174   _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,
 175                                      _uw, _Unwind_VRS_DataRepresentation,
 176                                      void *);
 177
 178   _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,
 179                                      _uw, _Unwind_VRS_DataRepresentation);
 180
 181
 182   /* Support functions for the PR.  */
 183 #define _Unwind_Exception _Unwind_Control_Block
 184   typedef char _Unwind_Exception_Class[8];
 185
 186   void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
 187   _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
 188
 189   _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);
 190   /* This should never be used.  */
 191   _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);
 192
 193   /* Interface functions: */
 194   _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp);
 195   void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp);
 196   _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp);
 197
 198   typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
 199        (int, _Unwind_Action, _Unwind_Exception_Class,
 200         _Unwind_Control_Block *, struct _Unwind_Context *, void *);
 201   _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
 202                                             _Unwind_Stop_Fn, void *);
 203   /* @@@ Use unwind data to perform a stack backtrace.  The trace callback
 204      is called for every stack frame in the call chain, but no cleanup
 205      actions are performed.  */
 206   typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (_Unwind_Context *, void *);
 207   _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn,
 208                                         void*);
 209
 210   _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
 211   void _Unwind_Complete(_Unwind_Control_Block *ucbp);
 212   void _Unwind_DeleteException (_Unwind_Exception *);
 213
 214   _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,
 215                                           _Unwind_Context *);
 216   _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,
 217                                             __gnu_unwind_state *);
 218
 219   static inline _Unwind_Word
 220   _Unwind_GetGR (_Unwind_Context *context, int regno)
 221     {
 222       _uw val;
 223       _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
 224       return val;
 225     }
 226
 227 #define _Unwind_GetIPInfo(context, ip_before_insn) \
 228   (*ip_before_insn = 0, _Unwind_GetIP (context))
 229
 230   static inline void
 231   _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)
 232     {
 233       _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
 234     }
 235
 236   _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
 237   void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
 238
 239 /* leb128 type numbers have a potentially unlimited size.
 240    The target of the following definitions of _sleb128_t and _uleb128_t
 241    is to have efficient data types large enough to hold the leb128 type
 242    numbers used in the unwind code.  */
 243 typedef long _sleb128_t;
 244 typedef unsigned long _uleb128_t;
 245
 246 #ifdef __cplusplus
 247 }   /* extern "C" */
 248 #endif
 249
 250 #endif /* defined UNWIND_ARM_COMMON_H */