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+/* Exception handling and frame unwind runtime interface routines.
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+ Copyright (C) 2001, 2003 Free Software Foundation, Inc.
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+
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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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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+
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+#ifndef _UNWIND_H
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+#define _UNWIND_H 1
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+
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+#ifdef __cplusplus
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+extern "C" {
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+#endif
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+
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+/* Level 1: Base ABI */
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+
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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__(__word__)));
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+typedef signed _Unwind_Sword __attribute__((__mode__(__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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+
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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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+
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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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+
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+
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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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+
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+struct _Unwind_Exception;
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+
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+typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
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+ struct _Unwind_Exception *);
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+
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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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+
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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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+
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+
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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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+
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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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+
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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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+
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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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+
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+/* Raise an exception for forced unwinding. */
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
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+
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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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+
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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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+
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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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+
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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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+
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+extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *);
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+
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+extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *);
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+
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+
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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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+
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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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+
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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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+
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+/* @@@ The following alternate entry points are for setjmp/longjmp
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+ based unwinding. */
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+
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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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+
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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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+
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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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+
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+#ifdef __ia64__
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+#include <stdlib.h>
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+
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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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+
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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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+
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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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+
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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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+
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+#ifdef __cplusplus
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+}
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+#endif
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+
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+#endif /* unwind.h */
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Bernhard Reutner-Fischer