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swapcontext.S revision 1.7 
      1 /*	$NetBSD: swapcontext.S,v 1.7 2006/01/05 02:46:15 uwe Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <machine/asm.h>
     40 #if defined(SYSLIBC_SCCS) && !defined(lint)
     41 	RCSID("$NetBSD: swapcontext.S,v 1.7 2006/01/05 02:46:15 uwe Exp $")
     42 #endif /* SYSLIBC_SCCS and not lint */
     43 
     44 /*
     45  * int
     46  * swapcontext(ucontext_t * restrict oucp, ucontext_t * restrict ucp);
     47  */
     48 ENTRY(swapcontext)
     49 	PIC_PROLOGUE(.L_got)
     50 	mov.l	r5, @-sp
     51 	sts.l	pr, @-sp
     52 
     53 	mov.l	.L__getcontext, r0
     54 1:	CALL	r0			/* _getcontext(oucp) */
     55 	 mov.l	r4, @-sp
     56 	mov.l	@sp+, r1
     57 	tst	r0, r0
     58 	bf	3f			/* return error from getcontext */
     59 
     60 	/* Note: getcontext does _UC_MACHINE_INTRV(oucp) = 0 for us */
     61 	mov.l	@sp, r0
     62 	mov.l	r0, @(36 + 1 * 4, r1)	/* _UC_MACHINE_SET_PC(oucp, pr) */
     63 	mov.l	.L_setcontext, r2
     64 2:	CALL	r2			/* setcontext(ucp) */
     65 	 mov.l	@(4, sp), r4
     66 	/* if we get here, return error from setcontext */
     67 3:
     68 	lds.l	@sp+, pr
     69 #ifdef PIC
     70 	add	#4, sp
     71 	rts
     72 	 PIC_EPILOGUE
     73 #else
     74 	rts
     75 	 add	#4, sp
     76 #endif
     77 
     78 	.align	2
     79 .L_got:			PIC_GOT_DATUM
     80 .L__getcontext:		CALL_DATUM(_C_LABEL(_getcontext), 1b)
     81 .L_setcontext:		CALL_DATUM(_C_LABEL(setcontext), 2b)
     82