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      1 /*	$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2025 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #define	_LOCORE
     30 
     31 #include <machine/asm.h>
     32 
     33 RCSID("$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $")
     34 
     35 #ifdef __PIC__
     36 #define	SETHI(label, got, reg)						      \
     37 	set	label, reg;		/* reg := &label - &GOT */	      \
     38 	ld	[got + reg], reg	/* reg := &label */
     39 #define	LO(label, reg)							      \
     40 	reg
     41 #else
     42 #define	SETHI(label, got, reg)						      \
     43 	sethi	%hi(label), reg		/* reg := &label - %lo(label) */
     44 #define	LO(label, reg)							      \
     45 	reg + %lo(label)
     46 #endif
     47 
     48 	.text
     49 
     50 /*
     51  * contextspfunc()
     52  *
     53  *	makecontext(3) function.  Store the stack pointer on entry at
     54  *	the global variable contextsp and call contextdone.
     55  */
     56 ENTRY(contextspfunc)
     57 	/* Reminder: o6 is frame pointer, o7 + 8 is return address. */
     58 	PIC_PROLOGUE(%g1, %o5)			/* g1 := &GOT, clobber o5 */
     59 	SETHI(_C_LABEL(contextsp), %g1, %o5)	/* o5 := &contextsp */
     60 	call	_C_LABEL(contextdone)		/* jump to contextdone */
     61 	 st	%sp, [LO(_C_LABEL(contextsp), %o5)] /* contextsp := sp */
     62 	/* don't care what happens here, caller must never return */
     63 	ta	1				/* Tcc, trap always */
     64 END(contextspfunc)
     65