Source code of Windows XP (NT5)
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158 lines
4.6 KiB

//++
//
//extern "C"
//VOID
//_GetNextInstrOffset (
// PVOID* ppReturnPoint
// );
//
//Routine Description:
//
// This function scans the scope tables associated with the specified
// procedure and calls exception and termination handlers as necessary.
//
//Arguments:
//
// ppReturnPoint (r32) - store b0 in *pReturnPoint
//
//Return Value:
//
// None
//
//--
.global _GetNextInstrOffset#
.proc _GetNextInstrOffset#
.align 32
_GetNextInstrOffset:
alloc r2=1, 0, 0, 0
mov r3 = b0;;
st8 [r32]=r3
br.ret.sptk.few b0
.endp _GetNextInstrOffset#
//++
//
//extern "C"
//PVOID
//__Cxx_ExecuteHandler (
// ULONGLONG MemoryStack,
// ULONGLONG BackingStore,
// ULONGLONG Handler,
// ULONGLONG GlobalPointer
// );
//
//Routine Description:
//
// This function scans the scope tables associated with the specified
// procedure and calls exception and termination handlers as necessary.
//
//Arguments:
//
// MemoryStack (r32) - memory stack pointer of establisher frame
//
// BackingStore (r33) - backing store pointer of establisher frame
//
// Handler (r34) - Entry point of handler
//
// GlobalPointer (r35) - GP of termination handler
//
//Return Value:
//
// Returns the continuation point
//
//--
.global __Cxx_ExecuteHandler#
.proc __Cxx_ExecuteHandler#
.align 32
__Cxx_ExecuteHandler:
mov gp = r35 // set new GP
mov b6 = r34 // handler address
br b6 // branch to handler
.endp __Cxx_ExecuteHandler#
//++
//
//extern "C" void* _CallSettingFrame(
// void* handler,
// EHRegistrationNode *pEstablisher,
// ULONG NLG_CODE)
//
//--
.global _NLG_Notify
.type _NLG_Notify, @function
.global _GetTargetGP
.type _GetTargetGP, @function
.global _GetImageBase
.type _GetImageBase, @function
.global _SetImageBase
.type _SetImageBase, @function
.global _CallSettingFrame
.global __NLG_Return
.proc _CallSettingFrame
.align 32
.prologue
_CallSettingFrame:
.save ar.pfs,r35
alloc loc0 = ar.pfs, 3, 8, 4, 0
.save rp,loc1
mov loc1 = b0 // save important stuff
.save pr,loc2
mov loc2 = pr
mov loc3 = gp
.body
ld8 loc5 = [in1],0x8 // pEstablisher->MemoryStackBP
;;
ld8 loc6 = [in1] // pEstablisher->BackingStoreBP
mov out0 = in0 // pass the target address
br.call.sptk b0 = _GetTargetGP // Get target's GP
;;
mov loc4 = ret0
br.call.sptk b0 = _GetImageBase //Get current image base
;;
mov loc7 = ret0 // save current image base
mov out0 = in0 // handler address
mov out1 = loc5 // pEstablisher->MemoryStackBP
mov out2 = loc6 // pEstablisher->BackingStoreBP
mov out3 = in2 // NLG_CODE
br.call.sptk b0 = _NLG_Notify // Notify debugger about transferring control to the handler
;;
mov gp = loc4 // set hanlder's GP
mov out0 = loc5 // pEstablisher->MemoryStackBP
mov out1 = loc6 // pEstablisher->BackingStoreBP
mov b6 = in0 // hanlder address
br.call.sptk b0 = b6 // call the handler (pEstablisher->MemoryStackBP, pEstablisher->BackingStoreBP)
;;
__NLG_Return:
mov gp = loc3 // restore gp
cmp.eq p14,p5 = ret0, r0 // did the handler return a continuation address?
;;
(p14) mov loc3 = 0 // if it didn'just return 0
(p5) mov loc3 = ret0 // if it did then it was image base relative for 2.5, so fix it up
mov out0 = loc7 // Restore image base in TLS, the handler could call an other dll with different image base
br.call.sptk b0 = _SetImageBase
;;
(p5) add loc3 = loc7, loc3 // ImageBase + handler's return for 2.5
;;
mov loc4 = 0x100 // NLG_CATCH_ENTER
;;
cmp.eq p14,p15 = loc4, in2 // if NLG_CODE == NLG_CATCH_ENTER notify debugger again about continuing mainstream
;;
mov out3 = 0x2 // NLG_CATCH_LEAVE
mov out1 = loc5 // pEstablisher->MemoryStackBP
mov out2 = loc6 // pEstablisher->BackingStoreBP
mov out0 = loc3 // handler continuation address
(p14) br.call.sptk b0 = _NLG_Notify
;;
mov ret0 = loc3
mov b0 = loc1 // restore stuff
mov pr = loc2
mov ar.pfs = loc0
br.ret.sptk b0
.endp _CallSettingFrame