| /* Exception handling and frame unwind runtime interface routines. |
| Copyright (C) 2001-2020 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC 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. |
| |
| GCC 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/>. */ |
| |
| /* This is derived from the C++ ABI for IA-64. Where we diverge |
| for cross-architecture compatibility are noted with "@@@". */ |
| |
| #ifndef _UNWIND_H |
| #define _UNWIND_H |
| |
| #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__) |
| /* Only for _GCC_specific_handler. */ |
| #include <windows.h> |
| #endif |
| |
| #ifndef HIDE_EXPORTS |
| #pragma GCC visibility push(default) |
| #endif |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* Level 1: Base ABI */ |
| |
| /* @@@ The IA-64 ABI uses uint64 throughout. Most places this is |
| inefficient for 32-bit and smaller machines. */ |
| typedef unsigned _Unwind_Word __attribute__((__mode__(__unwind_word__))); |
| typedef signed _Unwind_Sword __attribute__((__mode__(__unwind_word__))); |
| #if defined(__ia64__) && defined(__hpux__) |
| typedef unsigned _Unwind_Ptr __attribute__((__mode__(__word__))); |
| #else |
| typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__))); |
| #endif |
| typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__))); |
| |
| /* @@@ The IA-64 ABI uses a 64-bit word to identify the producer and |
| consumer of an exception. We'll go along with this for now even on |
| 32-bit machines. We'll need to provide some other option for |
| 16-bit machines and for machines with > 8 bits per byte. */ |
| typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__))); |
| |
| /* The unwind interface uses reason codes in several contexts to |
| identify the reasons for failures or other actions. */ |
| typedef enum |
| { |
| _URC_NO_REASON = 0, |
| _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 |
| } _Unwind_Reason_Code; |
| |
| |
| /* The unwind interface uses a pointer to an exception header object |
| as its representation of an exception being thrown. In general, the |
| full representation of an exception object is language- and |
| implementation-specific, but it will be prefixed by a header |
| understood by the unwind interface. */ |
| |
| struct _Unwind_Exception; |
| |
| typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code, |
| struct _Unwind_Exception *); |
| |
| 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 IA-64 ABI says that this structure must be double-word aligned. |
| Taking that literally does not make much sense generically. Instead we |
| provide the maximum alignment required by any type for the machine. */ |
| } __attribute__((__aligned__)); |
| |
| |
| /* The ACTIONS argument to the personality routine is a bitwise OR of one |
| or more of the following constants. */ |
| 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 |
| |
| /* The target can override this macro to define any back-end-specific |
| attributes required for the lowest-level stack frame. */ |
| #ifndef LIBGCC2_UNWIND_ATTRIBUTE |
| #define LIBGCC2_UNWIND_ATTRIBUTE |
| #endif |
| |
| /* This is an opaque type used to refer to a system-specific data |
| structure used by the system unwinder. This context is created and |
| destroyed by the system, and passed to the personality routine |
| during unwinding. */ |
| struct _Unwind_Context; |
| |
| /* Raise an exception, passing along the given exception object. */ |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_RaiseException (struct _Unwind_Exception *); |
| |
| /* Raise an exception for forced unwinding. */ |
| |
| typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn) |
| (int, _Unwind_Action, _Unwind_Exception_Class, |
| struct _Unwind_Exception *, struct _Unwind_Context *, void *); |
| |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_ForcedUnwind (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *); |
| |
| /* Helper to invoke the exception_cleanup routine. */ |
| extern void _Unwind_DeleteException (struct _Unwind_Exception *); |
| |
| /* Resume propagation of an existing exception. This is used after |
| e.g. executing cleanup code, and not to implement rethrowing. */ |
| extern void LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_Resume (struct _Unwind_Exception *); |
| |
| /* @@@ Resume propagation of a FORCE_UNWIND exception, or to rethrow |
| a normal exception that was handled. */ |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_Resume_or_Rethrow (struct _Unwind_Exception *); |
| |
| /* @@@ 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) |
| (struct _Unwind_Context *, void *); |
| |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_Backtrace (_Unwind_Trace_Fn, void *); |
| |
| /* These functions are used for communicating information about the unwind |
| context (i.e. the unwind descriptors and the user register state) between |
| the unwind library and the personality routine and landing pad. Only |
| selected registers may be manipulated. */ |
| |
| extern _Unwind_Word _Unwind_GetGR (struct _Unwind_Context *, int); |
| extern void _Unwind_SetGR (struct _Unwind_Context *, int, _Unwind_Word); |
| |
| extern _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *); |
| extern _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *); |
| extern void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr); |
| |
| /* @@@ Retrieve the CFA of the given context. */ |
| extern _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *); |
| |
| extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *); |
| |
| extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *); |
| |
| |
| /* The personality routine is the function in the C++ (or other language) |
| runtime library which serves as an interface between the system unwind |
| library and language-specific exception handling semantics. It is |
| specific to the code fragment described by an unwind info block, and |
| it is always referenced via the pointer in the unwind info block, and |
| hence it has no ABI-specified name. |
| |
| Note that this implies that two different C++ implementations can |
| use different names, and have different contents in the language |
| specific data area. Moreover, that the language specific data |
| area contains no version info because name of the function invoked |
| provides more effective versioning by detecting at link time the |
| lack of code to handle the different data format. */ |
| |
| typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn) |
| (int, _Unwind_Action, _Unwind_Exception_Class, |
| struct _Unwind_Exception *, struct _Unwind_Context *); |
| |
| /* @@@ The following alternate entry points are for setjmp/longjmp |
| based unwinding. */ |
| |
| struct SjLj_Function_Context; |
| extern void _Unwind_SjLj_Register (struct SjLj_Function_Context *); |
| extern void _Unwind_SjLj_Unregister (struct SjLj_Function_Context *); |
| |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_SjLj_RaiseException (struct _Unwind_Exception *); |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_SjLj_ForcedUnwind (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *); |
| extern void LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_SjLj_Resume (struct _Unwind_Exception *); |
| extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE |
| _Unwind_SjLj_Resume_or_Rethrow (struct _Unwind_Exception *); |
| |
| /* @@@ The following provide access to the base addresses for text |
| and data-relative addressing in the LDSA. In order to stay link |
| compatible with the standard ABI for IA-64, we inline these. */ |
| |
| #ifdef __ia64__ |
| static inline _Unwind_Ptr |
| _Unwind_GetDataRelBase (struct _Unwind_Context *_C) |
| { |
| /* The GP is stored in R1. */ |
| return _Unwind_GetGR (_C, 1); |
| } |
| |
| static inline _Unwind_Ptr |
| _Unwind_GetTextRelBase (struct _Unwind_Context *_C __attribute__ ((__unused__))) |
| { |
| __builtin_abort (); |
| return 0; |
| } |
| |
| /* @@@ Retrieve the Backing Store Pointer of the given context. */ |
| extern _Unwind_Word _Unwind_GetBSP (struct _Unwind_Context *); |
| #else |
| extern _Unwind_Ptr _Unwind_GetDataRelBase (struct _Unwind_Context *); |
| extern _Unwind_Ptr _Unwind_GetTextRelBase (struct _Unwind_Context *); |
| #endif |
| |
| /* @@@ Given an address, return the entry point of the function that |
| contains it. */ |
| extern void * _Unwind_FindEnclosingFunction (void *pc); |
| |
| #ifndef __SIZEOF_LONG__ |
| #error "__SIZEOF_LONG__ macro not defined" |
| #endif |
| |
| #ifndef __SIZEOF_POINTER__ |
| #error "__SIZEOF_POINTER__ macro not defined" |
| #endif |
| |
| |
| /* 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. |
| Mostly these types will simply be defined to long and unsigned long |
| except when a unsigned long data type on the target machine is not |
| capable of storing a pointer. */ |
| |
| #if __SIZEOF_LONG__ >= __SIZEOF_POINTER__ |
| typedef long _sleb128_t; |
| typedef unsigned long _uleb128_t; |
| #elif __SIZEOF_LONG_LONG__ >= __SIZEOF_POINTER__ |
| typedef long long _sleb128_t; |
| typedef unsigned long long _uleb128_t; |
| #else |
| # error "What type shall we use for _sleb128_t?" |
| #endif |
| |
| #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__) |
| /* Handles the mapping from SEH to GCC interfaces. */ |
| EXCEPTION_DISPOSITION _GCC_specific_handler (PEXCEPTION_RECORD, void *, |
| PCONTEXT, PDISPATCHER_CONTEXT, |
| _Unwind_Personality_Fn); |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #ifndef HIDE_EXPORTS |
| #pragma GCC visibility pop |
| #endif |
| |
| /* Additional actions to unwind number of stack frames. */ |
| #define _Unwind_Frames_Extra(frames) |
| |
| /* Increment frame count. */ |
| #define _Unwind_Frames_Increment(context, frames) frames++ |
| |
| #endif /* unwind.h */ |