minix/lib/libc/arch/sh3/gen/swapcontext.S

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/* $NetBSD: swapcontext.S,v 1.9 2008/04/28 20:22:57 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: swapcontext.S,v 1.9 2008/04/28 20:22:57 martin Exp $")
#endif /* SYSLIBC_SCCS and not lint */
/*
* int
* swapcontext(ucontext_t * restrict oucp, ucontext_t * restrict ucp);
*/
ENTRY(swapcontext)
PIC_PROLOGUE(.L_got)
mov.l r5, @-sp
sts.l pr, @-sp
mov.l .L__getcontext, r0
1: CALL r0 /* _getcontext(oucp) */
mov.l r4, @-sp
mov.l @sp+, r1
tst r0, r0
bf 3f /* return error from getcontext */
/* Note: getcontext does _UC_MACHINE_INTRV(oucp) = 0 for us */
mov.l @sp, r0
mov.l r0, @(36 + 1 * 4, r1) /* _UC_MACHINE_SET_PC(oucp, pr) */
mov.l .L_setcontext, r2
2: CALL r2 /* setcontext(ucp) */
mov.l @(4, sp), r4
/* if we get here, return error from setcontext */
3:
lds.l @sp+, pr
#ifdef PIC
add #4, sp
rts
PIC_EPILOGUE
#else
rts
add #4, sp
#endif
.align 2
.L_got: PIC_GOT_DATUM
.L__getcontext: CALL_DATUM(_C_LABEL(_getcontext), 1b)
.L_setcontext: CALL_DATUM(_C_LABEL(setcontext), 2b)
SET_ENTRY_SIZE(swapcontext)