contextspfunc.S revision 1.1 
11.1Sriastrad/*	$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:44 riastradh Exp $	*/
21.1Sriastrad
31.1Sriastrad/*-
41.1Sriastrad * Copyright (c) 2025 The NetBSD Foundation, Inc.
51.1Sriastrad * All rights reserved.
61.1Sriastrad *
71.1Sriastrad * Redistribution and use in source and binary forms, with or without
81.1Sriastrad * modification, are permitted provided that the following conditions
91.1Sriastrad * are met:
101.1Sriastrad * 1. Redistributions of source code must retain the above copyright
111.1Sriastrad *    notice, this list of conditions and the following disclaimer.
121.1Sriastrad * 2. Redistributions in binary form must reproduce the above copyright
131.1Sriastrad *    notice, this list of conditions and the following disclaimer in the
141.1Sriastrad *    documentation and/or other materials provided with the distribution.
151.1Sriastrad *
161.1Sriastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
171.1Sriastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
181.1Sriastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
191.1Sriastrad * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
201.1Sriastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
211.1Sriastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
221.1Sriastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
231.1Sriastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
241.1Sriastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
251.1Sriastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
261.1Sriastrad * POSSIBILITY OF SUCH DAMAGE.
271.1Sriastrad */
281.1Sriastrad
291.1Sriastrad#define	_LOCORE
301.1Sriastrad
311.1Sriastrad#include <machine/asm.h>
321.1Sriastrad
331.1SriastradRCSID("$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:44 riastradh Exp $")
341.1Sriastrad
351.1Sriastrad#include "SYS.h"
361.1Sriastrad
371.1Sriastrad	.text
381.1Sriastrad
391.1Sriastrad/*
401.1Sriastrad * contextspfunc()
411.1Sriastrad *
421.1Sriastrad *	makecontext(3) function.  Store the stack pointer on entry at
431.1Sriastrad *	the global variable contextsp and call contextdone.
441.1Sriastrad */
451.1SriastradLEAF(contextspfunc)
461.1Sriastrad	move	t0, sp			/* save stack pointer just in case */
471.1Sriastrad
481.1Sriastrad	PIC_PROLOGUE(contextspfunc)	/* gp setup, sets t3 */
491.1Sriastrad
501.1Sriastrad	PTR_LA	t1, _C_LABEL(contextsp)	/* load t1 := &contextsp */
511.1Sriastrad	 NOP_L				/* load hazard */
521.1Sriastrad	PTR_S	t0, 0(t1)		/* store contextsp := stack pointer */
531.1Sriastrad
541.1Sriastrad	PIC_TAILCALL(contextdone)
551.1SriastradEND(contextspfunc)
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