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Diffstat (limited to 'libc/sysdeps/linux/arm/unwind.h')
| -rw-r--r-- | libc/sysdeps/linux/arm/unwind.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/unwind.h b/libc/sysdeps/linux/arm/unwind.h new file mode 100644 index 000000000..eeb9cf8b6 --- /dev/null +++ b/libc/sysdeps/linux/arm/unwind.h @@ -0,0 +1,279 @@ +/* Header file for the ARM EABI unwinder + Copyright (C) 2003, 2004, 2005, 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 2, or (at your option) any + later version. + + In addition to the permissions in the GNU General Public License, the + Free Software Foundation gives you unlimited permission to link the + compiled version of this file into combinations with other programs, + and to distribute those combinations without any restriction coming + from the use of this file. (The General Public License restrictions + do apply in other respects; for example, they cover modification of + the file, and distribution when not linked into a combine + executable.) + + 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. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not, write to + the Free Software Foundation, 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ + +/* 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 + { +#ifdef _LIBC + /* For the benefit of code which assumes this is a scalar. All + glibc ever does is clear it. */ + _uw64 exception_class; +#else + char exception_class[8]; +#endif + 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 *); + _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(__NetBSD__) + /* Pc-relative indirect. */ + tmp += ptr; + tmp = *(_Unwind_Word *) tmp; +#elif defined(__symbian__) + /* 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) + + 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)) + +typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) + (struct _Unwind_Context *, void *); + +extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *); + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* defined UNWIND_ARM_H */ |