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/* Header file for the ARM EABI unwinder

   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009

   Free Software Foundation, Inc.

   Contributed by Paul Brook

   This file is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by the

   Free Software Foundation; either version 3, or (at your option) any

   later version.

   This file is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   General Public License for more details.

   Under Section 7 of GPL version 3, you are granted additional

   permissions described in the GCC Runtime Library Exception, version

   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and

   a copy of the GCC Runtime Library Exception along with this program;

   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

   <http://www.gnu.org/licenses/>.  */

/* Language-independent unwinder header public defines.  This contains both

   ABI defined objects, and GNU support routines.  */

#ifndef UNWIND_ARM_H

#define UNWIND_ARM_H

#define __ARM_EABI_UNWINDER__ 1

#ifdef __cplusplus

extern "C" {

#endif

  typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));

  typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));

  typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));

  typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));

  typedef _Unwind_Word _uw;

  typedef unsigned _uw64 __attribute__((mode(__DI__)));

  typedef unsigned _uw16 __attribute__((mode(__HI__)));

  typedef unsigned _uw8 __attribute__((mode(__QI__)));

  typedef enum

    {

      _URC_OK = 0,       /* operation completed successfully */

      _URC_FOREIGN_EXCEPTION_CAUGHT = 1,

      _URC_END_OF_STACK = 5,

      _URC_HANDLER_FOUND = 6,

      _URC_INSTALL_CONTEXT = 7,

      _URC_CONTINUE_UNWIND = 8,

      _URC_FAILURE = 9   /* unspecified failure of some kind */

    }

  _Unwind_Reason_Code;

  typedef enum

    {

      _US_VIRTUAL_UNWIND_FRAME = 0,

      _US_UNWIND_FRAME_STARTING = 1,

      _US_UNWIND_FRAME_RESUME = 2,

      _US_ACTION_MASK = 3,

      _US_FORCE_UNWIND = 8,

      _US_END_OF_STACK = 16

    }

  _Unwind_State;

  /* Provided only for for compatibility with existing code.  */

  typedef int _Unwind_Action;

#define _UA_SEARCH_PHASE        1

#define _UA_CLEANUP_PHASE       2

#define _UA_HANDLER_FRAME       4

#define _UA_FORCE_UNWIND        8

#define _UA_END_OF_STACK        16

#define _URC_NO_REASON  _URC_OK

  typedef struct _Unwind_Control_Block _Unwind_Control_Block;

  typedef struct _Unwind_Context _Unwind_Context;

  typedef _uw _Unwind_EHT_Header;

  /* UCB: */

  struct _Unwind_Control_Block

    {

      char exception_class[8];

      void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);

      /* Unwinder cache, private fields for the unwinder's use */

      struct

        {

          _uw reserved1;  /* Forced unwind stop fn, 0 if not forced */

          _uw reserved2;  /* Personality routine address */

          _uw reserved3;  /* Saved callsite address */

          _uw reserved4;  /* Forced unwind stop arg */

          _uw reserved5;

        }

      unwinder_cache;

      /* Propagation barrier cache (valid after phase 1): */

      struct

        {

          _uw sp;

          _uw bitpattern[5];

        }

      barrier_cache;

      /* Cleanup cache (preserved over cleanup): */

      struct

        {

          _uw bitpattern[4];

        }

      cleanup_cache;

      /* Pr cache (for pr's benefit): */

      struct

        {

          _uw fnstart;                  /* function start address */

          _Unwind_EHT_Header *ehtp;     /* pointer to EHT entry header word */

          _uw additional;               /* additional data */

          _uw reserved1;

        }

      pr_cache;

      long long int :0;  /* Force alignment to 8-byte boundary */

    };

  /* Virtual Register Set*/

  typedef enum

    {

      _UVRSC_CORE = 0,      /* integer register */

      _UVRSC_VFP = 1,       /* vfp */

      _UVRSC_FPA = 2,       /* fpa */

      _UVRSC_WMMXD = 3,     /* Intel WMMX data register */

      _UVRSC_WMMXC = 4      /* Intel WMMX control register */

    }

  _Unwind_VRS_RegClass;

  typedef enum

    {

      _UVRSD_UINT32 = 0,

      _UVRSD_VFPX = 1,

      _UVRSD_FPAX = 2,

      _UVRSD_UINT64 = 3,

      _UVRSD_FLOAT = 4,

      _UVRSD_DOUBLE = 5

    }

  _Unwind_VRS_DataRepresentation;

  typedef enum

    {

      _UVRSR_OK = 0,

      _UVRSR_NOT_IMPLEMENTED = 1,

      _UVRSR_FAILED = 2

    }

  _Unwind_VRS_Result;

  /* Frame unwinding state.  */

  typedef struct

    {

      /* The current word (bytes packed msb first).  */

      _uw data;

      /* Pointer to the next word of data.  */

      _uw *next;

      /* The number of bytes left in this word.  */

      _uw8 bytes_left;

      /* The number of words pointed to by ptr.  */

      _uw8 words_left;

    }

  __gnu_unwind_state;

  typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,

      _Unwind_Control_Block *, _Unwind_Context *);

  _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,

                                     _uw, _Unwind_VRS_DataRepresentation,

                                     void *);

  _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,

                                     _uw, _Unwind_VRS_DataRepresentation,

                                     void *);

  _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,

                                     _uw, _Unwind_VRS_DataRepresentation);

  /* Support functions for the PR.  */

#define _Unwind_Exception _Unwind_Control_Block

  typedef char _Unwind_Exception_Class[8];

  void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);

  _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);

  /* These two should never be used.  */

  _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);

  _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);

  /* Interface functions: */

  _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp);

  void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp);

  _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp);

  typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)

       (int, _Unwind_Action, _Unwind_Exception_Class,

        _Unwind_Control_Block *, struct _Unwind_Context *, void *);

  _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,

                                            _Unwind_Stop_Fn, void *);

  /* @@@ Use unwind data to perform a stack backtrace.  The trace callback

     is called for every stack frame in the call chain, but no cleanup

     actions are performed.  */

  typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (_Unwind_Context *, void *);

  _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn,

                                        void*);

  _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);

  void _Unwind_Complete(_Unwind_Control_Block *ucbp);

  void _Unwind_DeleteException (_Unwind_Exception *);

  _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,

                                          _Unwind_Context *);

  _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,

                                            __gnu_unwind_state *);

  /* Decode an R_ARM_TARGET2 relocation.  */

  static inline _Unwind_Word

  _Unwind_decode_target2 (_Unwind_Word ptr)

    {

      _Unwind_Word tmp;

      tmp = *(_Unwind_Word *) ptr;

      /* Zero values are always NULL.  */

      if (!tmp)

        return 0;

#if (defined(linux) && !defined(__uClinux__)) || defined(__NetBSD__)

      /* Pc-relative indirect.  */

      tmp += ptr;

      tmp = *(_Unwind_Word *) tmp;

#elif defined(__symbian__) || defined(__uClinux__)

      /* Absolute pointer.  Nothing more to do.  */

#else

      /* Pc-relative pointer.  */

      tmp += ptr;

#endif

      return tmp;

    }

  static inline _Unwind_Word

  _Unwind_GetGR (_Unwind_Context *context, int regno)

    {

      _uw val;

      _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);

      return val;

    }

  /* Return the address of the instruction, not the actual IP value.  */

#define _Unwind_GetIP(context) \

  (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)

#define _Unwind_GetIPInfo(context, ip_before_insn) \

  (*ip_before_insn = 0, _Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)

  static inline void

  _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)

    {

      _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);

    }

  /* The dwarf unwinder doesn't understand arm/thumb state.  We assume the

     landing pad uses the same instruction set as the call site.  */

#define _Unwind_SetIP(context, val) \

  _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))

/* leb128 type numbers have a potentially unlimited size.

   The target of the following definitions of _sleb128_t and _uleb128_t

   is to have efficient data types large enough to hold the leb128 type

   numbers used in the unwind code.  */

typedef long _sleb128_t;

typedef unsigned long _uleb128_t;

#ifdef __cplusplus

}   /* extern "C" */

#endif

#endif /* defined UNWIND_ARM_H */