| /*===---- unwind.h - Stack unwinding ----------------------------------------=== |
| * |
| * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| * See https://llvm.org/LICENSE.txt for license information. |
| * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| * |
| *===-----------------------------------------------------------------------=== |
| */ |
| |
| /* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/ |
| |
| #ifndef __CLANG_UNWIND_H |
| #define __CLANG_UNWIND_H |
| |
| #if defined(__APPLE__) && __has_include_next(<unwind.h>) |
| /* Darwin (from 11.x on) provide an unwind.h. If that's available, |
| * use it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE, |
| * so define that around the include.*/ |
| # ifndef _GNU_SOURCE |
| # define _SHOULD_UNDEFINE_GNU_SOURCE |
| # define _GNU_SOURCE |
| # endif |
| // libunwind's unwind.h reflects the current visibility. However, Mozilla |
| // builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the |
| // visibility to default and export its contents. gcc also allows users to |
| // override its override by #defining HIDE_EXPORTS (but note, this only obeys |
| // the user's -fvisibility setting; it doesn't hide any exports on its own). We |
| // imitate gcc's header here: |
| # ifdef HIDE_EXPORTS |
| # include_next <unwind.h> |
| # else |
| # pragma GCC visibility push(default) |
| # include_next <unwind.h> |
| # pragma GCC visibility pop |
| # endif |
| # ifdef _SHOULD_UNDEFINE_GNU_SOURCE |
| # undef _GNU_SOURCE |
| # undef _SHOULD_UNDEFINE_GNU_SOURCE |
| # endif |
| #else |
| |
| #include <stdint.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* It is a bit strange for a header to play with the visibility of the |
| symbols it declares, but this matches gcc's behavior and some programs |
| depend on it */ |
| #ifndef HIDE_EXPORTS |
| #pragma GCC visibility push(default) |
| #endif |
| |
| typedef uintptr_t _Unwind_Word __attribute__((__mode__(__unwind_word__))); |
| typedef intptr_t _Unwind_Sword __attribute__((__mode__(__unwind_word__))); |
| typedef uintptr_t _Unwind_Ptr; |
| typedef uintptr_t _Unwind_Internal_Ptr; |
| typedef uint64_t _Unwind_Exception_Class; |
| |
| typedef intptr_t _sleb128_t; |
| typedef uintptr_t _uleb128_t; |
| |
| struct _Unwind_Context; |
| #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH__)) |
| struct _Unwind_Control_Block; |
| typedef struct _Unwind_Control_Block _Unwind_Exception; /* Alias */ |
| #else |
| struct _Unwind_Exception; |
| typedef struct _Unwind_Exception _Unwind_Exception; |
| #endif |
| typedef enum { |
| _URC_NO_REASON = 0, |
| #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \ |
| !defined(__ARM_DWARF_EH__) |
| _URC_OK = 0, /* used by ARM EHABI */ |
| #endif |
| _URC_FOREIGN_EXCEPTION_CAUGHT = 1, |
| |
| _URC_FATAL_PHASE2_ERROR = 2, |
| _URC_FATAL_PHASE1_ERROR = 3, |
| _URC_NORMAL_STOP = 4, |
| |
| _URC_END_OF_STACK = 5, |
| _URC_HANDLER_FOUND = 6, |
| _URC_INSTALL_CONTEXT = 7, |
| _URC_CONTINUE_UNWIND = 8, |
| #if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \ |
| !defined(__ARM_DWARF_EH__) |
| _URC_FAILURE = 9 /* used by ARM EHABI */ |
| #endif |
| } _Unwind_Reason_Code; |
| |
| typedef enum { |
| _UA_SEARCH_PHASE = 1, |
| _UA_CLEANUP_PHASE = 2, |
| |
| _UA_HANDLER_FRAME = 4, |
| _UA_FORCE_UNWIND = 8, |
| _UA_END_OF_STACK = 16 /* gcc extension to C++ ABI */ |
| } _Unwind_Action; |
| |
| typedef void (*_Unwind_Exception_Cleanup_Fn)(_Unwind_Reason_Code, |
| _Unwind_Exception *); |
| |
| #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH__)) |
| typedef struct _Unwind_Control_Block _Unwind_Control_Block; |
| typedef uint32_t _Unwind_EHT_Header; |
| |
| struct _Unwind_Control_Block { |
| uint64_t exception_class; |
| void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *); |
| /* unwinder cache (private fields for the unwinder's use) */ |
| struct { |
| uint32_t reserved1; /* forced unwind stop function, 0 if not forced */ |
| uint32_t reserved2; /* personality routine */ |
| uint32_t reserved3; /* callsite */ |
| uint32_t reserved4; /* forced unwind stop argument */ |
| uint32_t reserved5; |
| } unwinder_cache; |
| /* propagation barrier cache (valid after phase 1) */ |
| struct { |
| uint32_t sp; |
| uint32_t bitpattern[5]; |
| } barrier_cache; |
| /* cleanup cache (preserved over cleanup) */ |
| struct { |
| uint32_t bitpattern[4]; |
| } cleanup_cache; |
| /* personality cache (for personality's benefit) */ |
| struct { |
| uint32_t fnstart; /* function start address */ |
| _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */ |
| uint32_t additional; /* additional data */ |
| uint32_t reserved1; |
| } pr_cache; |
| long long int : 0; /* force alignment of next item to 8-byte boundary */ |
| } __attribute__((__aligned__(8))); |
| #else |
| struct _Unwind_Exception { |
| _Unwind_Exception_Class exception_class; |
| _Unwind_Exception_Cleanup_Fn exception_cleanup; |
| #if !defined (__USING_SJLJ_EXCEPTIONS__) && defined (__SEH__) |
| _Unwind_Word private_[6]; |
| #else |
| _Unwind_Word private_1; |
| _Unwind_Word private_2; |
| #endif |
| /* The Itanium ABI requires that _Unwind_Exception objects are "double-word |
| * aligned". GCC has interpreted this to mean "use the maximum useful |
| * alignment for the target"; so do we. */ |
| } __attribute__((__aligned__)); |
| #endif |
| |
| typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)(int, _Unwind_Action, |
| _Unwind_Exception_Class, |
| _Unwind_Exception *, |
| struct _Unwind_Context *, |
| void *); |
| |
| typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)(int, _Unwind_Action, |
| _Unwind_Exception_Class, |
| _Unwind_Exception *, |
| struct _Unwind_Context *); |
| typedef _Unwind_Personality_Fn __personality_routine; |
| |
| typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *, |
| void *); |
| |
| #if defined(__arm__) && !(defined(__USING_SJLJ_EXCEPTIONS__) || defined(__ARM_DWARF_EH__)) |
| typedef enum { |
| _UVRSC_CORE = 0, /* integer register */ |
| _UVRSC_VFP = 1, /* vfp */ |
| _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_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; |
| |
| typedef uint32_t _Unwind_State; |
| #define _US_VIRTUAL_UNWIND_FRAME ((_Unwind_State)0) |
| #define _US_UNWIND_FRAME_STARTING ((_Unwind_State)1) |
| #define _US_UNWIND_FRAME_RESUME ((_Unwind_State)2) |
| #define _US_ACTION_MASK ((_Unwind_State)3) |
| #define _US_FORCE_UNWIND ((_Unwind_State)8) |
| |
| _Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context, |
| _Unwind_VRS_RegClass __regclass, |
| uint32_t __regno, |
| _Unwind_VRS_DataRepresentation __representation, |
| void *__valuep); |
| |
| _Unwind_VRS_Result _Unwind_VRS_Set(struct _Unwind_Context *__context, |
| _Unwind_VRS_RegClass __regclass, |
| uint32_t __regno, |
| _Unwind_VRS_DataRepresentation __representation, |
| void *__valuep); |
| |
| static __inline__ |
| _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *__context, int __index) { |
| _Unwind_Word __value; |
| _Unwind_VRS_Get(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value); |
| return __value; |
| } |
| |
| static __inline__ |
| void _Unwind_SetGR(struct _Unwind_Context *__context, int __index, |
| _Unwind_Word __value) { |
| _Unwind_VRS_Set(__context, _UVRSC_CORE, __index, _UVRSD_UINT32, &__value); |
| } |
| |
| static __inline__ |
| _Unwind_Word _Unwind_GetIP(struct _Unwind_Context *__context) { |
| _Unwind_Word __ip = _Unwind_GetGR(__context, 15); |
| return __ip & ~(_Unwind_Word)(0x1); /* Remove thumb mode bit. */ |
| } |
| |
| static __inline__ |
| void _Unwind_SetIP(struct _Unwind_Context *__context, _Unwind_Word __value) { |
| _Unwind_Word __thumb_mode_bit = _Unwind_GetGR(__context, 15) & 0x1; |
| _Unwind_SetGR(__context, 15, __value | __thumb_mode_bit); |
| } |
| #else |
| _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int); |
| void _Unwind_SetGR(struct _Unwind_Context *, int, _Unwind_Word); |
| |
| _Unwind_Word _Unwind_GetIP(struct _Unwind_Context *); |
| void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Word); |
| #endif |
| |
| |
| _Unwind_Word _Unwind_GetIPInfo(struct _Unwind_Context *, int *); |
| |
| _Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *); |
| |
| _Unwind_Word _Unwind_GetBSP(struct _Unwind_Context *); |
| |
| void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *); |
| |
| _Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *); |
| |
| /* DWARF EH functions; currently not available on Darwin/ARM */ |
| #if !defined(__APPLE__) || !defined(__arm__) |
| _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Exception *); |
| _Unwind_Reason_Code _Unwind_ForcedUnwind(_Unwind_Exception *, _Unwind_Stop_Fn, |
| void *); |
| void _Unwind_DeleteException(_Unwind_Exception *); |
| void _Unwind_Resume(_Unwind_Exception *); |
| _Unwind_Reason_Code _Unwind_Resume_or_Rethrow(_Unwind_Exception *); |
| |
| #endif |
| |
| _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *); |
| |
| /* setjmp(3)/longjmp(3) stuff */ |
| typedef struct SjLj_Function_Context *_Unwind_FunctionContext_t; |
| |
| void _Unwind_SjLj_Register(_Unwind_FunctionContext_t); |
| void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t); |
| _Unwind_Reason_Code _Unwind_SjLj_RaiseException(_Unwind_Exception *); |
| _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *, |
| _Unwind_Stop_Fn, void *); |
| void _Unwind_SjLj_Resume(_Unwind_Exception *); |
| _Unwind_Reason_Code _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *); |
| |
| void *_Unwind_FindEnclosingFunction(void *); |
| |
| #ifdef __APPLE__ |
| |
| _Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *) |
| __attribute__((__unavailable__)); |
| _Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *) |
| __attribute__((__unavailable__)); |
| |
| /* Darwin-specific functions */ |
| void __register_frame(const void *); |
| void __deregister_frame(const void *); |
| |
| struct dwarf_eh_bases { |
| uintptr_t tbase; |
| uintptr_t dbase; |
| uintptr_t func; |
| }; |
| void *_Unwind_Find_FDE(const void *, struct dwarf_eh_bases *); |
| |
| void __register_frame_info_bases(const void *, void *, void *, void *) |
| __attribute__((__unavailable__)); |
| void __register_frame_info(const void *, void *) __attribute__((__unavailable__)); |
| void __register_frame_info_table_bases(const void *, void*, void *, void *) |
| __attribute__((__unavailable__)); |
| void __register_frame_info_table(const void *, void *) |
| __attribute__((__unavailable__)); |
| void __register_frame_table(const void *) __attribute__((__unavailable__)); |
| void __deregister_frame_info(const void *) __attribute__((__unavailable__)); |
| void __deregister_frame_info_bases(const void *)__attribute__((__unavailable__)); |
| |
| #else |
| |
| _Unwind_Ptr _Unwind_GetDataRelBase(struct _Unwind_Context *); |
| _Unwind_Ptr _Unwind_GetTextRelBase(struct _Unwind_Context *); |
| |
| #endif |
| |
| |
| #ifndef HIDE_EXPORTS |
| #pragma GCC visibility pop |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |
| |
| #endif /* __CLANG_UNWIND_H */ |