044075ac29
From-SVN: r66590
173 lines
4.4 KiB
C
173 lines
4.4 KiB
C
/* Subroutines needed for unwinding stack frames via the libunwind API.
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Copyright (C) 2002, 2003
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Free Software Foundation, Inc.
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#include "tconfig.h"
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#include "tsystem.h"
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#include "unwind.h"
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#ifndef __USING_SJLJ_EXCEPTIONS__
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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typedef struct {
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_Unwind_Personality_Fn personality;
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} _Unwind_FrameState;
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struct _Unwind_Context {
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unw_cursor_t cursor;
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};
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/* First come the helper-routines that are needed by unwind.inc. */
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static _Unwind_Reason_Code
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uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
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{
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unw_proc_info_t pi;
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if (unw_step (&context->cursor) <= 0)
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return _URC_END_OF_STACK;
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unw_get_proc_info(&context->cursor, &pi);
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fs->personality = (_Unwind_Personality_Fn) pi.handler;
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return _URC_NO_REASON;
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}
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#define uw_update_context(context,fs) do { ; } while (0)
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static inline _Unwind_Ptr
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uw_identify_context (struct _Unwind_Context *context)
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{
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unw_word_t ip;
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unw_get_reg (&context->cursor, UNW_REG_IP, &ip);
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return (_Unwind_Ptr) ip;
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}
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#define uw_init_context(context) \
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do \
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{ \
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unw_context_t uc; \
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unw_getcontext (&uc); \
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unw_init_local (&(context)->cursor, &uc); \
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} \
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while (0)
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static inline void __attribute__ ((noreturn))
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uw_install_context (struct _Unwind_Context *current __attribute__ ((unused)),
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struct _Unwind_Context *target)
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{
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unw_resume (&(target)->cursor);
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abort ();
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}
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/* Now come the helper-routines which may be called from an exception
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handler. The interface for these routines are defined by the C++
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ABI. See: http://www.codesourcery.com/cxx-abi/abi-eh.html */
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_Unwind_Word
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_Unwind_GetGR (struct _Unwind_Context *context, int index)
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{
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unw_word_t ret;
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/* Note: here we depend on the fact that general registers are
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expected to start with register number 0! */
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unw_get_reg (&context->cursor, index, &ret);
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return ret;
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}
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/* Get the value of the CFA as saved in CONTEXT. */
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_Unwind_Word
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_Unwind_GetCFA (struct _Unwind_Context *context)
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{
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/* ??? Is there any way to get this information? */
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return NULL;
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}
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/* Overwrite the saved value for register REG in CONTEXT with VAL. */
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void
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_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
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{
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/* Note: here we depend on the fact that general registers are
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expected to start with register number 0! */
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unw_set_reg (&context->cursor, index, val);
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}
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/* Retrieve the return address for CONTEXT. */
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inline _Unwind_Ptr
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_Unwind_GetIP (struct _Unwind_Context *context)
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{
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unw_word_t ret;
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unw_get_reg (&context->cursor, UNW_REG_IP, &ret);
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return ret;
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}
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/* Overwrite the return address for CONTEXT with VAL. */
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inline void
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_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
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{
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unw_set_reg (&context->cursor, UNW_REG_IP, val);
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}
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void *
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_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
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{
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unw_proc_info_t pi;
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unw_get_proc_info(&context->cursor, &pi);
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return (void *) pi.lsda;
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}
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_Unwind_Ptr
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_Unwind_GetRegionStart (struct _Unwind_Context *context)
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{
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unw_proc_info_t pi;
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unw_get_proc_info(&context->cursor, &pi);
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return (_Unwind_Ptr) pi.start_ip;
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}
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void *
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_Unwind_FindEnclosingFunction (void *pc)
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{
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return NULL;
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}
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#include "unwind.inc"
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#endif /* !__USING_SJLJ_EXCEPTIONS__ */
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