mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
220 lines
8.0 KiB
C
220 lines
8.0 KiB
C
/* Exception handling and frame unwind runtime interface routines.
|
|
Copyright (C) 2001-2017 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; 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 1
|
|
|
|
#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;
|
|
_Unwind_Word private_1;
|
|
_Unwind_Word private_2;
|
|
|
|
/* @@@ 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
|
|
|
|
/* 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 _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 _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 _Unwind_Resume (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 _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 maybe 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 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 _Unwind_SjLj_RaiseException
|
|
(struct _Unwind_Exception *);
|
|
extern _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind
|
|
(struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
|
|
extern void _Unwind_SjLj_Resume (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__
|
|
#include <stdlib.h>
|
|
|
|
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)
|
|
{
|
|
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);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* unwind.h */
|