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Diffstat (limited to 'private/crt32/misc/alpha/jmpuwind.s')
| -rw-r--r-- | private/crt32/misc/alpha/jmpuwind.s | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/private/crt32/misc/alpha/jmpuwind.s b/private/crt32/misc/alpha/jmpuwind.s new file mode 100644 index 000000000..934b9d549 --- /dev/null +++ b/private/crt32/misc/alpha/jmpuwind.s @@ -0,0 +1,167 @@ +// TITLE("Handler Stubs and Jump to Unwind") +//++ +// +// Copyright (c) 1992 Microsoft Corporation +// Copyright (c) 1993 Digital Equipment Corporation +// +// Module Name: +// +// jmpuwind.s +// +// Abstract: +// +// This module implements the Alpha acc compiler specific routines to call +// exception handlers and to jump to the runtime library unwind routines. +// +// Author: +// +// David N. Cutler (davec) 12-Sep-1990 +// +// Environment: +// +// Any mode. +// +// Revision History: +// +// Thomas Van Baak (tvb) 30-Apr-1992 +// +// Adapted for Alpha AXP. +// +//-- + +#include "ksalpha.h" + + SBTTL("Execute Exception Filter") +//++ +// +// ULONG +// __C_ExecuteExceptionFilter ( +// PEXCEPTION_POINTERS ExceptionPointers, +// EXCEPTION_FILTER ExceptionFilter, +// ULONG EstablisherFrame +// ) +// +// Routine Description: +// +// This function sets the static link and transfers control to the specified +// exception filter routine. +// +// Arguments: +// +// ExceptionPointers (a0) - Supplies a pointer to the exception pointers +// structure. +// +// ExceptionFilter (a1) - Supplies the address of the exception filter +// routine. +// +// EstablisherFrame (a2) - Supplies the establisher frame pointer. +// +// Return Value: +// +// The value returned by the exception filter routine. +// +//-- + + LEAF_ENTRY(__C_ExecuteExceptionFilter) + +// +// The protocol for calling exception filters used by the acc compiler is +// that the uplevel frame pointer is passed in register v0 and the pointer +// to the exception pointers structure is passed in register a0. The GEM +// C compiler expects the static link in t0. Here both registers are set. +// + + mov a2, v0 // set static link + mov a2, t0 // set alternate static link + jmp zero, (a1) // transfer control to exception filter + + .end __C_ExecuteExceptionFilter + + SBTTL("Execute Termination Handler") +//++ +// +// ULONG +// __C_ExecuteTerminationHandler ( +// BOOLEAN AbnormalTermination, +// TERMINATION_HANDLER TerminationHandler, +// ULONG EstablisherFrame +// ) +// +// Routine Description: +// +// This function sets the static link and transfers control to the specified +// termination handler routine. +// +// Arguments: +// +// AbnormalTermination (a0) - Supplies a boolean value that determines +// whether the termination is abnormal. +// +// TerminationHandler (a1) - Supplies the address of the termination handler +// routine. +// +// EstablisherFrame (a2) - Supplies the establisher frame pointer. +// +// Return Value: +// +// The value returned by the termination handler routine, if any. +// +//-- + + LEAF_ENTRY(__C_ExecuteTerminationHandler) + +// +// The protocol for calling termination handlers used by the acc compiler +// is that the uplevel frame pointer is passed in register v0 and the boolean +// abnormal termination value is passed in register a0. The GEM C compiler +// expects the static link in t0. Here both registers are set. +// + + mov a2, v0 // set static link + mov a2, t0 // set alternate static link + jmp zero, (a1) // transfer control to termination handler + + .end __C_ExecuteTerminationHandler + + SBTTL("Jump to Unwind") +//++ +// +// VOID +// __jump_unwind ( +// IN PVOID EstablishFrame, +// IN PVOID TargetPc +// ) +// +// Routine Description: +// +// This function transfers control to unwind. It is used by the acc +// compiler when a goto out of the body of a try statement occurs. +// +// Arguments: +// +// EstablishFrame (a0) - Supplies the establisher frame pointer of the +// target of the unwind. +// +// TargetPc (a1) - Supplies the target instruction address where control +// is to be transferred to after the unwind operation is complete. +// +// Return Value: +// +// None. +// +//-- + + LEAF_ENTRY(__jump_unwind) + +// +// The first two arguments are the same as those required by unwind. Set the +// second two arguments and jump to unwind. This thunk is necessary to avoid +// name space pollution. The compiler should not generate a call directly to +// RtlUnwind. +// + + mov zero, a2 // set NULL exception record address + mov zero, a3 // set target return value of 0 + br zero, RtlUnwind // unwind to specified target + + .end __jump_unwind |