642 lines
23 KiB
C++
642 lines
23 KiB
C++
/***
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*trnsctrl.cpp -
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*
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* Copyright (c) 1990-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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*
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*Revision History:
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* 06-01-97 Created by TiborL.
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* 07-12-99 RDL Image relative fixes under CC_P7_SOFT25.
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* 10-07-99 SAH utc_p7#1126: fix ipsr.ri reset.
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* 10-19-99 TGL Miscellaneous unwind fixes.
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* 03-15-00 PML Remove CC_P7_SOFT25, which is now on permanently.
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* 03-30-00 SAH New version of GetLanguageSpecificData from ntia64.h.
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* 06-08-00 RDL VS#111429: IA64 workaround for AV while handling throw.
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*
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****/
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#if defined(_NTSUBSET_)
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extern "C" {
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#include <ntstatus.h> // STATUS_UNHANDLED_EXCEPTION
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#include <ntos.h>
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#include <ex.h> // ExRaiseException
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}
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#endif
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extern "C" {
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#include <windows.h>
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};
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#include <mtdll.h>
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#include <ehassert.h>
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#include <ehdata.h>
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#include <trnsctrl.h>
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#include <ehstate.h>
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#include <eh.h>
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#include <ehhooks.h>
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#include <kxia64.h>
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#include <ia64inst.h>
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#include <cvconst.h>
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#pragma hdrstop
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#ifdef _MT
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#define pFrameInfoChain (*((FRAMEINFO **) &(_getptd()->_pFrameInfoChain)))
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#define pUnwindContext (*((CONTEXT **) &(_getptd()->_pUnwindContext)))
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#define _ImageBase (_getptd()->_ImageBase)
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#define _TargetGp (_getptd()->_TargetGp)
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#define _ThrowImageBase (_getptd()->_ThrowImageBase)
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#define _pCurrentException (*((EHExceptionRecord **)&(_getptd()->_curexception)))
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#else
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static FRAMEINFO *pFrameInfoChain = NULL; // used to remember nested frames
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static CONTEXT *pUnwindContext = NULL; // context to assist the return to 'UnwindNestedFrames'
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static unsigned __int64 _ImageBase = 0;
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static unsigned __int64 _ThrowImageBase = 0;
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static unsigned __int64 _TargetGp = 0;
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extern EHExceptionRecord *_pCurrentException; // defined in frame.cpp
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#endif
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// Should be used out of ntia64.h, but can't figure out how to allow that with
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// existing dependencies.
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// If GetLanguageSpecificData changes cause a redefinition error rather than
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// using wrong version.
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// Version 2 = soft2.3 conventions
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// Version 3 = soft2.6 conventions
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#define GetLanguageSpecificData(f, base) \
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((((PUNWIND_INFO)(base + f->UnwindInfoAddress))->Version <= 2) ? \
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(((PVOID)(base + f->UnwindInfoAddress + sizeof(UNWIND_INFO) + \
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((PUNWIND_INFO)(base+f->UnwindInfoAddress))->DataLength*sizeof(ULONGLONG) + sizeof(ULONGLONG)))) : \
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(((PVOID)(base + f->UnwindInfoAddress + sizeof(UNWIND_INFO) + \
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((PUNWIND_INFO)(base+f->UnwindInfoAddress))->DataLength*sizeof(ULONGLONG) + sizeof(ULONG)))))
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extern "C" VOID RtlRestoreContext (PCONTEXT ContextRecord,PEXCEPTION_RECORD ExceptionRecord OPTIONAL);
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extern "C" void RtlCaptureContext(CONTEXT*);
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extern "C" void _GetNextInstrOffset(PVOID*);
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extern "C" void __FrameUnwindToState(EHRegistrationNode *, DispatcherContext *, FuncInfo *, __ehstate_t);
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//
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// Returns the establisher frame pointers. For catch handlers it is the parent's frame pointer.
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//
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EHRegistrationNode *_GetEstablisherFrame(
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EHRegistrationNode *pRN,
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DispatcherContext *pDC,
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FuncInfo *pFuncInfo,
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EHRegistrationNode *pEstablisher
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) {
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TryBlockMapEntry *pEntry;
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unsigned num_of_try_blocks = FUNC_NTRYBLOCKS(*pFuncInfo);
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unsigned index;
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__ehstate_t curState;
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curState = _StateFromControlPc(pFuncInfo, pDC);
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pEstablisher->MemoryStackFp = pRN->MemoryStackFp;
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pEstablisher->BackingStoreFp = pRN->BackingStoreFp;
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for (index = 0; index < num_of_try_blocks; index++) {
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pEntry = FUNC_PTRYBLOCK(*pFuncInfo, index, pDC->ImageBase);
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if (curState > TBME_HIGH(*pEntry) && curState <= TBME_CATCHHIGH(*pEntry)) {
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pEstablisher->MemoryStackFp = *(__int64 *)OffsetToAddress(-8,pRN->MemoryStackFp);
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pEstablisher->BackingStoreFp = *(__int64 *)OffsetToAddress(-16,pRN->BackingStoreFp);
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break;
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}
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}
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return pEstablisher;
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}
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#if 0 // v-vadimp new version with NLG support for the debugger is in handlers.s
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//
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// Temporary version until the asm version is written that supports NLG
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//
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extern "C" void* _CallSettingFrame(
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void* handler,
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EHRegistrationNode *pEstablisher,
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ULONG NLG_CODE)
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{
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void* retValue = __Cxx_ExecuteHandler(
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pEstablisher->MemoryStackFp,
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pEstablisher->BackingStoreFp,
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(__int64)handler,
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_TargetGp
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);
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return retValue? (void*)(_ImageBase + (__int32)retValue) : NULL;
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}
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#endif
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extern "C" CONTEXT* _GetUnwindContext()
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{
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return pUnwindContext;
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}
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extern "C" unsigned __int64 _GetImageBase()
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{
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return _ImageBase;
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}
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extern "C" VOID _SetImageBase(unsigned __int64 ImageBaseToRestore)
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{
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_ImageBase = ImageBaseToRestore;
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}
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extern "C" unsigned __int64 _GetThrowImageBase()
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{
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return _ThrowImageBase;
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}
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extern "C" VOID _SetThrowImageBase(unsigned __int64 NewThrowImageBase)
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{
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_ThrowImageBase = NewThrowImageBase;
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}
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extern "C" unsigned __int64 _GetTargetGP(unsigned __int64 TargetAddress)
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{
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unsigned __int64 ImageBase;
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unsigned __int64 TargetGp;
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PRUNTIME_FUNCTION pContFunctionEntry = RtlLookupFunctionEntry(TargetAddress, &ImageBase, &TargetGp);
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// return _TargetGp;
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return TargetGp;
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}
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extern "C" VOID _MoveContext(CONTEXT* pTarget, CONTEXT* pSource)
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{
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RtlMoveMemory(pTarget, pSource, sizeof(CONTEXT));
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}
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// This function returns the try block for the given state if the state is in a
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// catch; otherwise, NULL is returned.
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static __inline TryBlockMapEntry *_CatchTryBlock(
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FuncInfo *pFuncInfo,
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__ehstate_t curState
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) {
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TryBlockMapEntry *pEntry;
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unsigned num_of_try_blocks = FUNC_NTRYBLOCKS(*pFuncInfo);
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unsigned index;
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for (index = 0; index < num_of_try_blocks; index++) {
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pEntry = FUNC_PTRYBLOCK(*pFuncInfo, index, _ImageBase);
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if (curState > TBME_HIGH(*pEntry) && curState <= TBME_CATCHHIGH(*pEntry)) {
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return pEntry;
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}
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}
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return NULL;
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}
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//
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// This routine returns TRUE if we are executing from within a catch. Otherwise, FALSE is returned.
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//
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BOOL _ExecutionInCatch(
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DispatcherContext *pDC,
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FuncInfo *pFuncInfo
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) {
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__ehstate_t curState = _StateFromControlPc(pFuncInfo, pDC);
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return _CatchTryBlock(pFuncInfo, curState)? TRUE : FALSE;
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}
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// This function unwinds to the empty state.
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VOID __FrameUnwindToEmptyState(
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EHRegistrationNode *pRN,
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DispatcherContext *pDC,
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FuncInfo *pFuncInfo
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) {
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__ehstate_t stateFromControlPC;
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TryBlockMapEntry *pEntry;
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EHRegistrationNode EstablisherFramePointers, *pEstablisher;
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pEstablisher = _GetEstablisherFrame(pRN, pDC, pFuncInfo, &EstablisherFramePointers);
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stateFromControlPC = _StateFromControlPc(pFuncInfo, pDC);
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pEntry = _CatchTryBlock(pFuncInfo, stateFromControlPC);
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// Reuse pFrameInfoChain->State to propagate the previous catch block's final state.
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// This is used in case there is a nested catch inside this catch
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// who already dtored object's in our frame. This can happen if in our catch
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// there is a nested catch that throws and the catch executed is an outer catch.
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//
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//try{
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// try{
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// throw(1);
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// }catch(int){
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// B b4;
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// try{
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// throw 2;
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// }catch(int){
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// //this throw would dtor b4 by calling the outermost catch,
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// //and also during unwinding the first catch would try to dtor as well.
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// throw 3;
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// }
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// }
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//}catch(int){
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// throw 4;
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//}
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//
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if( pEntry && pFrameInfoChain != NULL ) {
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__ehstate_t curState = GetCurrentState(pEstablisher, pDC, pFuncInfo);
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if( pFrameInfoChain->State != -2 && pFrameInfoChain->State < curState )
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SetState(pEstablisher, pDC, pFuncInfo, pFrameInfoChain->State);
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pFrameInfoChain->State = curState;
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}
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else if( pFrameInfoChain != NULL ) {
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__ehstate_t curState = GetCurrentState(pEstablisher, pDC, pFuncInfo);
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if( pEntry == NULL && stateFromControlPC < curState ) {
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SetState(pEstablisher, pDC, pFuncInfo, stateFromControlPC - 1);
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}
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pFrameInfoChain->State = -2;
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}
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__FrameUnwindToState(pEstablisher, pDC,
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pFuncInfo, pEntry == NULL ? EH_EMPTY_STATE : TBME_HIGH(*pEntry) /*+ 1*/);
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}
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BOOL _IsExceptionObjectDestroyed(PVOID pExceptionObject,FRAMEINFO *pFrameInfo)
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{
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for (; pFrameInfo != NULL; pFrameInfo = pFrameInfo->pNext ) {
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if( pFrameInfo->pExceptionObjectDestroyed == pExceptionObject ) {
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return TRUE;
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}
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}
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return FALSE;
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}
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void _MarkExceptionObjectDestroyed(EHExceptionRecord *pExcept)
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{
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for (FRAMEINFO *pFrameInfo = pFrameInfoChain; pFrameInfo != NULL; pFrameInfo = pFrameInfo->pNext ) {
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if( pFrameInfo->pExcept == pExcept ) {
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pFrameInfo->pExceptionObjectDestroyed = PER_PEXCEPTOBJ(pExcept);
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}
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}
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}
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void _UnlinkFrame(FRAMEINFO *pFrameInfo)
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{
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FRAMEINFO *pPrevFrameInfo = pFrameInfoChain;
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if( pFrameInfoChain == pFrameInfo ) {
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pFrameInfoChain = pFrameInfoChain->pNext;
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return;
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}
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for (FRAMEINFO *pCurFrameInfo = pFrameInfoChain; pCurFrameInfo != NULL; pCurFrameInfo = pCurFrameInfo->pNext ) {
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if( pCurFrameInfo == pFrameInfo ) {
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pPrevFrameInfo->pNext = pCurFrameInfo->pNext;
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return;
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}
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pPrevFrameInfo = pCurFrameInfo;
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}
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}
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// Find the frame info structure corresponding to the given address. Return
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// NULL if the frame info structure does not exist.
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FRAMEINFO *_FindFrameInfo(
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PVOID pContinuation,
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FRAMEINFO *pFrameInfo
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) {
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unsigned __int64 ImageBase;
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unsigned __int64 TargetGp;
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PRUNTIME_FUNCTION pContFunctionEntry = RtlLookupFunctionEntry((unsigned __int64)pContinuation, &ImageBase, &TargetGp);
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PRUNTIME_FUNCTION pFrameFunctionEntry = pFrameInfo->pFunctionEntry;
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DASSERT(pFrameInfo != NULL);
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for (; pFrameInfo != NULL; pFrameInfo = pFrameInfo->pNext ) {
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if (pContFunctionEntry == pFrameInfo->pFunctionEntry &&
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(pContinuation > OffsetToAddress(pFrameInfo->pFunctionEntry->BeginAddress,ImageBase)) &&
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(pContinuation <= OffsetToAddress(pFrameInfo->pFunctionEntry->EndAddress,ImageBase))
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){
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return pFrameInfo;
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}
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}
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return NULL;
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}
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BOOL __IsFramePdataMatch(
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PVOID pContinuation,
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RUNTIME_FUNCTION* pFrameRfe)
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{
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BOOL fRetVal = FALSE;
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unsigned __int64 ImageBase, TargetGp;
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PRUNTIME_FUNCTION pContRfe = RtlLookupFunctionEntry((unsigned __int64) pContinuation, &ImageBase, &TargetGp);
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FuncInfo* pContFuncInfo = (FuncInfo*)(ImageBase + *(PULONG)GetLanguageSpecificData(pContRfe, ImageBase));
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FuncInfo* pFrameFuncInfo = (FuncInfo*)(ImageBase + *(PULONG)GetLanguageSpecificData(pFrameRfe, ImageBase));
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//
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// first see if there is a regular match, i.e. if the RFE registered with the frame
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// matches the RFE for the continuation address
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//
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fRetVal = (pContRfe == pFrameRfe) &&
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(pContinuation > OffsetToAddress(pFrameRfe->BeginAddress,ImageBase)) &&
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(pContinuation <= OffsetToAddress(pFrameRfe->EndAddress,ImageBase));
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if (!fRetVal && (pContFuncInfo->bbtFlags == BBT_UNIQUE_FUNCINFO)) {
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fRetVal = (pContFuncInfo == pFrameFuncInfo);
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}
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return fRetVal;
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}
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//
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// Given the address of a continuation point, return the corresponding context.
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// Each frame info was saved just before a catch handler was called.
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// The most recently encountered frame is at the head of the chain.
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// The routine starts out with the frame given as the second argument, and scans the
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// linked list for the frame that corresponds to the continuation point.
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//
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CONTEXT* _FindAndUnlinkFrame(PVOID pContinuation, FRAMEINFO *pFrameInfo)
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{
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DASSERT(pFrameInfo != NULL);
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for( ; pFrameInfo != NULL; pFrameInfo = pFrameInfo->pNext ) {
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if(__IsFramePdataMatch(pContinuation, pFrameInfo->pFunctionEntry)) {
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//
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// We found the frame.
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// All frames preceeding and including this one are gone. so unlink them.
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//
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CONTEXT* pExitContext = pFrameInfo->pExitContext;
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pFrameInfoChain = pFrameInfo->pNext;
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//
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// If there are no more exceptions are pending get rid of unneeded frame info records.
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//
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if( _pCurrentException == NULL ) {
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while( pFrameInfoChain != NULL && pFrameInfoChain->pExceptionObjectDestroyed ) {
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pFrameInfoChain = pFrameInfoChain->pNext;
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}
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}
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return pExitContext;
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}
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}
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DASSERT(pFrameInfo != NULL);
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return NULL;
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}
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//
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// Save the frame information for this scope. Put it at the head of the linked-list.
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//
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FRAMEINFO* _CreateFrameInfo(
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FRAMEINFO *pFrameInfo,
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DispatcherContext *pDC,
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CONTEXT *pExitContext,
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__ehstate_t State,
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PVOID pExceptionObjectDestroyed,
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EHExceptionRecord *pExcept
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) {
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pFrameInfo->pFunctionEntry = pDC->FunctionEntry;
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pFrameInfo->pExitContext = pExitContext;
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pFrameInfo->pExceptionObjectDestroyed = pExceptionObjectDestroyed;
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pFrameInfo->pExceptionObjectToBeDestroyed = NULL;
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pFrameInfo->pExcept = pExcept;
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pFrameInfo->State = State;
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pFrameInfo->dtorThrowFlag = FALSE;
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pFrameInfo->isRethrow = FALSE;
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if( pFrameInfoChain != NULL && pFrameInfoChain->dtorThrowFlag ) {
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pFrameInfoChain->dtorThrowFlag = FALSE;
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pFrameInfoChain = pFrameInfoChain->pNext;
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}
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pFrameInfo->pNext = (pFrameInfo < pFrameInfoChain)? pFrameInfoChain : NULL;
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pFrameInfoChain = pFrameInfo;
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return pFrameInfo;
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}
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//
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// THIS ROUTINE IS USED ONLY TO JUMP TO THE CONTINUATION POINT
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//
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// Sets SP and jumps to specified code address.
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// Does not return.
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//
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void _JumpToContinuation(
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unsigned __int64 TargetAddress, // The target address to call
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CONTEXT *pContext, // Context of target function
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EHExceptionRecord *pExcept
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) {
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unsigned __int64 ImageBase;
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unsigned __int64 TargetGp;
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PRUNTIME_FUNCTION pFunctionEntry = RtlLookupFunctionEntry(TargetAddress, &ImageBase, &TargetGp);
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pContext->StIIP = TargetAddress;
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pContext->IntGp = TargetGp;
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pContext->StIPSR &= ~IPSR_RI_MASK;
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RtlRestoreContext(pContext,(PEXCEPTION_RECORD)pExcept);
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}
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//
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// Prototype for the internal handler
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//
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extern "C" EXCEPTION_DISPOSITION __InternalCxxFrameHandler(
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EHExceptionRecord *pExcept, // Information for this exception
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EHRegistrationNode *pRN, // Dynamic information for this frame
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CONTEXT *pContext, // Context info
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DispatcherContext *pDC, // More dynamic info for this frame
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FuncInfo *pFuncInfo, // Static information for this frame
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int CatchDepth, // How deeply nested are we?
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EHRegistrationNode *pMarkerRN, // Marker node for when checking inside catch block
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BOOL recursive); // True if this is a translation exception
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//
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// __CxxFrameHandler - Real entry point to the runtime
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//
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extern "C" _CRTIMP EXCEPTION_DISPOSITION __CxxFrameHandler(
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EHExceptionRecord *pExcept, // Information for this exception
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__int64 MemoryStackFp, // SP of user program
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__int64 BackingStoreFp, // BSP of user program
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CONTEXT *pContext, // Context info
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DispatcherContext *pDC, // More dynamic info for this frame
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__int64 TargetGp // GP of user program
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) {
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FuncInfo *pFuncInfo;
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EXCEPTION_DISPOSITION result;
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EHRegistrationNode EstablisherFrame = { MemoryStackFp, BackingStoreFp };
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_ImageBase = pDC->ImageBase;
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_TargetGp = TargetGp;
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_ThrowImageBase = (unsigned __int64)pExcept->params.pThrowImageBase;
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pFuncInfo = (FuncInfo*)(_ImageBase + *(PULONG)GetLanguageSpecificData(pDC->FunctionEntry, _ImageBase));
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result = __InternalCxxFrameHandler( pExcept, &EstablisherFrame, pContext, pDC, pFuncInfo, 0, NULL, FALSE );
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return result;
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}
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// Call the SEH to EH translator.
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BOOL _CallSETranslator(
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EHExceptionRecord *pExcept, // The exception to be translated
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EHRegistrationNode *pRN, // Dynamic info of function with catch
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CONTEXT *pContext, // Context info
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DispatcherContext *pDC, // More dynamic info of function with catch (ignored)
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FuncInfo *pFuncInfo, // Static info of function with catch
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ULONG CatchDepth, // How deeply nested in catch blocks are we?
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EHRegistrationNode *pMarkerRN // Marker for parent context
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) {
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pRN;
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pDC;
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pFuncInfo;
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CatchDepth;
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// Call the translator.
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_EXCEPTION_POINTERS excptr = { (PEXCEPTION_RECORD)pExcept, pContext };
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|
__pSETranslator(PER_CODE(pExcept), &excptr);
|
|
|
|
// If we got back, then we were unable to translate it.
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
//
|
|
// This structure is the FuncInfo (HandlerData) for handler __TranslatorGuardHandler
|
|
//
|
|
struct TransGuardRec {
|
|
FuncInfo *pFuncInfo; // Static info for subject function
|
|
EHRegistrationNode *pFrame; // Dynamic info for subject function
|
|
ULONG CatchDepth; // How deeply nested are we?
|
|
EHRegistrationNode *pMarkerFrame; // Marker for parent context
|
|
PVOID pContinue; // Continuation address within CallSEHTranslator
|
|
PVOID pSP; // SP within CallSEHTranslator
|
|
BOOL DidUnwind; // True if this frame was unwound
|
|
};
|
|
|
|
#if 0
|
|
//
|
|
// This routine is the handler for CallSETranslator which is defined in handlers.s
|
|
//
|
|
extern "C" _CRTIMP EXCEPTION_DISPOSITION __TranslatorGuardHandler(
|
|
EHExceptionRecord *pExcept, // Information for this exception
|
|
EHRegistrationNode *pFrame, // The translator guard frame
|
|
CONTEXT *pContext, // Context info
|
|
DispatcherContext *pDC // Dynamic info for this frame
|
|
) {
|
|
//
|
|
// The handler data is a pointer to an integer that is an offset to the TGRN structure
|
|
// relative to the frame pointer.
|
|
//
|
|
TransGuardRec *pTransGuardData = (TransGuardRec*)((char*)pFrame->MemoryStackFp - *(int*)(pDC->FunctionEntry->HandlerData));
|
|
if (IS_UNWINDING(PER_FLAGS(pExcept)))
|
|
{
|
|
pTransGuardData->DidUnwind = TRUE;
|
|
return ExceptionContinueSearch;
|
|
}
|
|
else {
|
|
//
|
|
// Check for a handler:
|
|
//
|
|
__InternalCxxFrameHandler( pExcept,
|
|
pTransGuardData->pFrame,
|
|
pContext,
|
|
pDC,
|
|
pTransGuardData->pFuncInfo,
|
|
pTransGuardData->CatchDepth,
|
|
pTransGuardData->pMarkerFrame,
|
|
TRUE );
|
|
// Unreached.
|
|
return ExceptionContinueSearch;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// _GetRangeOfTrysToCheck - determine which try blocks are of interest, given
|
|
// the current catch block nesting depth. We only check the trys at a single
|
|
// depth.
|
|
//
|
|
// Returns:
|
|
// Address of first try block of interest is returned
|
|
// pStart and pEnd get the indices of the range in question
|
|
//
|
|
TryBlockMapEntry* _GetRangeOfTrysToCheck(
|
|
EHRegistrationNode *pRN,
|
|
FuncInfo *pFuncInfo,
|
|
int CatchDepth,
|
|
__ehstate_t curState,
|
|
unsigned *pStart,
|
|
unsigned *pEnd,
|
|
DispatcherContext *pDC
|
|
) {
|
|
TryBlockMapEntry *pEntry;
|
|
unsigned num_of_try_blocks = FUNC_NTRYBLOCKS(*pFuncInfo);
|
|
|
|
DASSERT( num_of_try_blocks > 0 );
|
|
|
|
for( unsigned int index = 0; index < num_of_try_blocks; index++ ) {
|
|
pEntry = FUNC_PTRYBLOCK(*pFuncInfo, index, pDC->ImageBase);
|
|
if( curState >= TBME_LOW(*pEntry) && curState <= TBME_HIGH(*pEntry) ) {
|
|
*pStart = index;
|
|
|
|
*pEnd = FUNC_NTRYBLOCKS(*pFuncInfo);
|
|
DASSERT( *pEnd <= num_of_try_blocks && *pStart < *pEnd );
|
|
|
|
#if 1
|
|
int SavedState = GetUnwindTryBlock(pRN, pDC, pFuncInfo);
|
|
if( SavedState != -1 && SavedState >= curState )
|
|
continue;
|
|
#else
|
|
int SavedTryNdx = GetUnwindTryBlock(pRN, pDC, pFuncInfo);
|
|
if( SavedTryNdx != -1 ) {
|
|
*pStart = SavedTryNdx + 1;
|
|
if( *pStart < *pEnd && pEntry != NULL ) {
|
|
pEntry = FUNC_PTRYBLOCK(*pFuncInfo, SavedTryNdx + 1, pDC->ImageBase);
|
|
}
|
|
}
|
|
#endif
|
|
return pEntry;
|
|
}
|
|
}
|
|
|
|
*pStart = *pEnd = 0;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
#pragma optimize("",off)
|
|
extern "C" unsigned __int64 __getReg(int);
|
|
extern "C" void __setReg(int, unsigned __int64);
|
|
#pragma intrinsic(__getReg)
|
|
#pragma intrinsic(__setReg)
|
|
extern "C" void _UnwindNestedFrames(
|
|
EHRegistrationNode *pFrame, // Unwind up to (but not including) this frame
|
|
EHExceptionRecord *pExcept, // The exception that initiated this unwind
|
|
CONTEXT *pContext // Context info for current exception
|
|
) {
|
|
CONTEXT LocalContext; // Create context for this routine to return from RtlUnwind
|
|
CONTEXT ScratchContext; // Context record to pass to RtlUnwind2 to be used as scratch
|
|
volatile int Unwound = FALSE; // Flag that assist to return from RtlUnwind2
|
|
PVOID pReturnPoint = NULL; // The address we want to return from RtlUnwind2
|
|
|
|
RtlCaptureContext(&LocalContext);
|
|
//
|
|
// set up the return label
|
|
//
|
|
_GetNextInstrOffset(&pReturnPoint);
|
|
if(Unwound)
|
|
goto LAB_UNWOUND;
|
|
|
|
LocalContext.StIIP = (ULONGLONG)pReturnPoint;
|
|
LocalContext.IntGp = __getReg(CV_IA64_IntR1);
|
|
LocalContext.StIPSR &= ~IPSR_RI_MASK;
|
|
pUnwindContext = &LocalContext; // save address of LocalContext in global/TLS pUnwindContext
|
|
Unwound = TRUE;
|
|
#ifdef _NT
|
|
RtlUnwind2(*pFrame, (ULONG_PTR)pReturnPoint, (PEXCEPTION_RECORD)pExcept, NULL, &ScratchContext);
|
|
#else
|
|
RtlUnwind2(*pFrame, pReturnPoint, (PEXCEPTION_RECORD)pExcept, NULL, &ScratchContext);
|
|
#endif
|
|
|
|
LAB_UNWOUND:
|
|
__setReg(CV_IA64_IntR1,LocalContext.IntGp);
|
|
pContext->StIPSR &= ~IPSR_RI_MASK;
|
|
PER_FLAGS(pExcept) &= ~EXCEPTION_UNWINDING;
|
|
//
|
|
// reset global/TLS pUnwindContext for future exceptions
|
|
//
|
|
pUnwindContext = NULL;
|
|
}
|