76 lines
2.5 KiB
ArmAsm
76 lines
2.5 KiB
ArmAsm
|
/* $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)
|