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//++//// Module Name://// jmpuwind.s//// Abstract://// This module implements the IA64 specific routine to jump to the runtime// time library unwind routine.//// Author://// William K. Cheung (wcheung) 4-Jan-1996//// // based on the version by David N. Cutler (davec) 12-Sep-1990//// Environment://// Any mode.//// Revision History:////--
#include "ksia64.h"
//++//// LONG// __C_ExecuteExceptionFilter (// ULONGLONG MemoryStack,// ULONGLONG BackingStore,// NTSTATUS ExceptionCode,// PEXCEPTION_POINTERS ExceptionPointers,// ULONGLONG ExceptionFilter,// ULONGLONG GlobalPointer// )//// Routine Description://// This function sets the gp register and transfers control to the specified// exception filter routine.//// Arguments://// MemoryStack (a0) - memory stack pointer of establisher frame//// BackingStore (a1) - backing store pointer of establisher frame//// ExceptionCode (a2) - Exception Code.//// ExceptionPointers (a3) - Supplies a pointer to the exception pointers// structure.//// ExceptionFilter (a4) - Entry point of exception filter//// GlobalPointer (a5) - GP of exception filter//// Return Value://// The value returned by the exception filter routine.////--
LEAF_ENTRY(__C_ExecuteExceptionFilter)
mov gp = a5 mov bt0 = a4 br bt0 // branch to exception filter ;;
LEAF_EXIT(__C_ExecuteExceptionFilter) //++//// VOID// __C_ExecuteTerminationHandler (// ULONGLONG MemoryStack,// ULONGLONG BackingStore,// BOOLEAN AbnormalTermination,// ULONGLONG TerminationHandler,// ULONGLONG GlobalPointer// )//// Routine Description://// This function sets the gp register and transfers control to the specified// termination handler routine.//// Arguments://// MemoryStack (a0) - memory stack pointer of establisher frame//// BackingStore (a1) - backing store pointer of establisher frame//// AbnormalTermination (a2) - Supplies a boolean value that determines// whether the termination is abnormal.//// TerminationHandler (a3) - Entry point of termination handler//// GlobalPointer (a4) - GP of termination handler//// Return Value://// None.////--
LEAF_ENTRY(__C_ExecuteTerminationHandler)
mov gp = a4 mov bt0 = a3 br bt0 // branch to termination handler ;;
LEAF_EXIT(__C_ExecuteTerminationHandler) //++//// VOID// __jump_unwind (// IN PVOID TargetMsFrame,// IN PVOID TargetBsFrame,// IN PVOID TargetPc,// )//// Routine Description://// This function transfer control to unwind. It is used by the MIPS// compiler when a goto out of the body or a try statement occurs.//// Arguments://// TargetMsFrame (a0) - Supplies the memory stack frame pointer of the// target of the unwind.//// TargetBsFrame (a1) - Supplies the backing store frame pointer of the// target of the unwind.//// TargetPc (a2) - Supplies the target instruction address where control// is to be transfered to after the unwind operation is complete.//// Return Value://// None.//// N.B. The first 2 input registers are reused for local while the third// input register is reused as output register.////--
.global RtlUnwind2 .type RtlUnwind2, @function .global RtlPcToFileHeader .type RtlPcToFileHeader, @function
NESTED_ENTRY(__jump_unwind)
.regstk 3, 2, 6, 0 .prologue 0xC, loc0 .fframe ContextFrameLength, Jn10
alloc loc0 = ar.pfs, 3, 3, 6, 0 mov loc1 = brp[Jn10:] add sp = -ContextFrameLength, sp ;;
mov loc2 = gp
PROLOGUE_END
//// Call RtlPcToFileHeader to get the image base of caller// The image base is returned in memory location STACK_SCRATCH_AREA, sp// and also in register v0// mov out0 = brp add out1 = STACK_SCRATCH_AREA, sp br.call.sptk brp = RtlPcToFileHeader ;;
mov gp = loc2//// Add image base to image relative offset passed in a2// add out2 = v0, a2//// Setup rest of arguments to RtlUnwind2// add out5 = STACK_SCRATCH_AREA, sp mov out4 = zero mov out3 = zero mov out1 = a1 mov out0 = a0 br.call.sptk brp = RtlUnwind2 ;;
.restore Jn20
[Jn20:] add sp = ContextFrameLength, sp nop.f 0 mov ar.pfs = loc0
nop.m 0 mov brp = loc1 br.ret.sptk brp
NESTED_EXIT(__jump_unwind)
//++// VOID// _NLG_Notify(// IN PVOID Funclet// IN FRAME_POINTERS EstablisherFrame,// IN ULONG NLGCode// )//// Routine Description://// Provides the handler/longjmp addresses to the debugger//// Arguments://// Funclet (a0) - Supplies the target address of non-local goto// EstablisherFrame (a1,a2) - Supplies a pointer to frame of the establisher // function// NLGCode (a3) - Supplies NLG identifying value//// Return Value://// None.////-- .global __NLG_Dispatch .global __NLG_Destination
.sdata__NLG_Destination:: data8 0x19930520 // signature data8 0 // handler address data8 0 // code data8 0 // memory stack frame pointer data8 0 // register stack frame pointer
LEAF_ENTRY(_NLG_Notify)
add t0 = @gprel(__NLG_Destination+0x8), gp add t1 = @gprel(__NLG_Destination+0x10), gp nop.i 0 ;;
st8 [t0] = a0, 16 st8 [t1] = a3, 16 nop.i 0 ;;
st8 [t0] = a1 st8 [t1] = a2 nop.i 0 __NLG_Dispatch:: nop.m 0 nop.i 0 br.ret.sptk b0
LEAF_EXIT(_NLG_Notify)
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