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// TITLE("Set Jump Extended")
//++
//
// Copyright (c) 1993 Digital Equipment Corporation
//
// Module Name:
//
// otsjmpex.s
//
// Abstract:
//
// This module implements the Alpha C8/GEM C compiler specific routine to
// provide SAFE handling of setjmp/longjmp with respect to structured
// exception handling.
//
// Author:
//
// Thomas Van Baak (tvb) 22-Apr-1993
//
// Environment:
//
// Any mode.
//
// Revision History:
//
//--
#include "ksalpha.h"
//
// Define variable that will cause setjmp/longjmp to be safe with respect
// to structured exception handling.
//
.globl _Otssetjmpexused
.data
_Otssetjmpexused:
.long _Otssetjmpex3 // set address of safe setjmp routine
SBTTL("Set Jump Extended - GEM version")
//++
//
// int
// _Otssetjmpex3 (
// IN OUT jmp_buf JumpBuffer,
// IN PVOID RealFramePointer,
// IN PVOID SebPointer
// )
//
// Routine Description:
//
// This function implements a safe setjmp.
//
// Arguments:
//
// JumpBuffer (a0) - Supplies the address of a jump buffer to store the
// jump information.
//
// RealFramePointer (a1) - Supplies the real frame pointer value.
//
// SebPointer (a2) - Supplies the pointer to the current SEB or NULL
// if the call was made outside of any SEH scope.
//
// Return Value:
//
// A value of zero is returned.
//
//--
LEAF_ENTRY(_Otssetjmpex3)
//
// Save the given set jump context in the jump buffer.
//
stl a1, JbFp(a0) // save real frame pointer
stl ra, JbPc(a0) // save target instruction address
stl a2, JbSeb(a0) // save SEB pointer
ldil t0, 3 // get GEM safe setjmp flag
stl t0, JbType(a0) // set jump buffer context type
mov zero, v0 // set return value
ret zero, (ra) // return
.end _Otssetjmpex3
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