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220 lines
8.0 KiB
C
220 lines
8.0 KiB
C
/* Exception handling and frame unwind runtime interface routines.
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Copyright (C) 2001-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This is derived from the C++ ABI for IA-64. Where we diverge
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for cross-architecture compatibility are noted with "@@@". */
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#ifndef _UNWIND_H
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#define _UNWIND_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Level 1: Base ABI */
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/* @@@ The IA-64 ABI uses uint64 throughout. Most places this is
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inefficient for 32-bit and smaller machines. */
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typedef unsigned _Unwind_Word __attribute__((__mode__(__unwind_word__)));
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typedef signed _Unwind_Sword __attribute__((__mode__(__unwind_word__)));
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#if defined(__ia64__) && defined(__hpux__)
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typedef unsigned _Unwind_Ptr __attribute__((__mode__(__word__)));
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#else
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typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
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#endif
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typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
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/* @@@ The IA-64 ABI uses a 64-bit word to identify the producer and
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consumer of an exception. We'll go along with this for now even on
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32-bit machines. We'll need to provide some other option for
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16-bit machines and for machines with > 8 bits per byte. */
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typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
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/* The unwind interface uses reason codes in several contexts to
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identify the reasons for failures or other actions. */
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typedef enum
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{
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_URC_NO_REASON = 0,
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_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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_URC_FATAL_PHASE2_ERROR = 2,
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_URC_FATAL_PHASE1_ERROR = 3,
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_URC_NORMAL_STOP = 4,
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_URC_END_OF_STACK = 5,
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_URC_HANDLER_FOUND = 6,
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_URC_INSTALL_CONTEXT = 7,
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_URC_CONTINUE_UNWIND = 8
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} _Unwind_Reason_Code;
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/* The unwind interface uses a pointer to an exception header object
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as its representation of an exception being thrown. In general, the
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full representation of an exception object is language- and
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implementation-specific, but it will be prefixed by a header
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understood by the unwind interface. */
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struct _Unwind_Exception;
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typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
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struct _Unwind_Exception *);
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struct _Unwind_Exception
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{
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_Unwind_Exception_Class exception_class;
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_Unwind_Exception_Cleanup_Fn exception_cleanup;
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_Unwind_Word private_1;
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_Unwind_Word private_2;
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/* @@@ The IA-64 ABI says that this structure must be double-word aligned.
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Taking that literally does not make much sense generically. Instead we
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provide the maximum alignment required by any type for the machine. */
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} __attribute__((__aligned__));
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/* The ACTIONS argument to the personality routine is a bitwise OR of one
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or more of the following constants. */
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typedef int _Unwind_Action;
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#define _UA_SEARCH_PHASE 1
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#define _UA_CLEANUP_PHASE 2
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#define _UA_HANDLER_FRAME 4
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#define _UA_FORCE_UNWIND 8
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#define _UA_END_OF_STACK 16
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/* This is an opaque type used to refer to a system-specific data
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structure used by the system unwinder. This context is created and
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destroyed by the system, and passed to the personality routine
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during unwinding. */
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struct _Unwind_Context;
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/* Raise an exception, passing along the given exception object. */
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extern _Unwind_Reason_Code _Unwind_RaiseException (struct _Unwind_Exception *);
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/* Raise an exception for forced unwinding. */
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typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
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(int, _Unwind_Action, _Unwind_Exception_Class,
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struct _Unwind_Exception *, struct _Unwind_Context *, void *);
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extern _Unwind_Reason_Code _Unwind_ForcedUnwind (struct _Unwind_Exception *,
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_Unwind_Stop_Fn,
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void *);
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/* Helper to invoke the exception_cleanup routine. */
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extern void _Unwind_DeleteException (struct _Unwind_Exception *);
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/* Resume propagation of an existing exception. This is used after
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e.g. executing cleanup code, and not to implement rethrowing. */
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extern void _Unwind_Resume (struct _Unwind_Exception *);
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/* @@@ Use unwind data to perform a stack backtrace. The trace callback
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is called for every stack frame in the call chain, but no cleanup
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actions are performed. */
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typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)
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(struct _Unwind_Context *, void *);
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extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
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/* These functions are used for communicating information about the unwind
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context (i.e. the unwind descriptors and the user register state) between
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the unwind library and the personality routine and landing pad. Only
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selected registers maybe manipulated. */
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extern _Unwind_Word _Unwind_GetGR (struct _Unwind_Context *, int);
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extern void _Unwind_SetGR (struct _Unwind_Context *, int, _Unwind_Word);
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extern _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
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extern void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
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/* @@@ Retrieve the CFA of the given context. */
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extern _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
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extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *);
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/* The personality routine is the function in the C++ (or other language)
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runtime library which serves as an interface between the system unwind
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library and language-specific exception handling semantics. It is
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specific to the code fragment described by an unwind info block, and
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it is always referenced via the pointer in the unwind info block, and
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hence it has no ABI-specified name.
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Note that this implies that two different C++ implementations can
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use different names, and have different contents in the language
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specific data area. Moreover, that the language specific data
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area contains no version info because name of the function invoked
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provides more effective versioning by detecting at link time the
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lack of code to handle the different data format. */
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typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
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(int, _Unwind_Action, _Unwind_Exception_Class,
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struct _Unwind_Exception *, struct _Unwind_Context *);
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/* @@@ The following alternate entry points are for setjmp/longjmp
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based unwinding. */
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struct SjLj_Function_Context;
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extern void _Unwind_SjLj_Register (struct SjLj_Function_Context *);
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extern void _Unwind_SjLj_Unregister (struct SjLj_Function_Context *);
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extern _Unwind_Reason_Code _Unwind_SjLj_RaiseException
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(struct _Unwind_Exception *);
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extern _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind
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(struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
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extern void _Unwind_SjLj_Resume (struct _Unwind_Exception *);
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/* @@@ The following provide access to the base addresses for text
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and data-relative addressing in the LDSA. In order to stay link
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compatible with the standard ABI for IA-64, we inline these. */
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#ifdef __ia64__
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#include <stdlib.h>
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static inline _Unwind_Ptr
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_Unwind_GetDataRelBase (struct _Unwind_Context *_C)
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{
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/* The GP is stored in R1. */
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return _Unwind_GetGR (_C, 1);
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}
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static inline _Unwind_Ptr
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_Unwind_GetTextRelBase (struct _Unwind_Context *_C)
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{
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abort ();
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return 0;
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}
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/* @@@ Retrieve the Backing Store Pointer of the given context. */
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extern _Unwind_Word _Unwind_GetBSP (struct _Unwind_Context *);
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#else
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extern _Unwind_Ptr _Unwind_GetDataRelBase (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetTextRelBase (struct _Unwind_Context *);
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#endif
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/* @@@ Given an address, return the entry point of the function that
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contains it. */
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extern void * _Unwind_FindEnclosingFunction (void *pc);
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#ifdef __cplusplus
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}
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#endif
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#endif /* unwind.h */
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