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Brute force _lock_cas() by disabling interrupts. 

Need to redo it with RAS later.
This commit is contained in:
uwe 2007-02-23 03:24:47 +00:00
parent b2fe1ffc55
commit 3cdc20a9de
1 changed files with 46 additions and 2 deletions
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48
sys/arch/sh3/sh3/lock_stubs.S
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@ -1,6 +1,34 @@
/* $NetBSD: lock_stubs.S,v 1.1 2007/02/22 22:53:26 uwe Exp $ */
/* $NetBSD: lock_stubs.S,v 1.2 2007/02/23 03:24:47 uwe Exp $ */
/*
* Copyright (c) 2007 Valeriy E. Ushakov
* All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sh3/asm.h>
#include <sh3/psl.h>
/*
* LINTSTUB: include <sys/types.h>
@ -9,7 +37,23 @@
/*
* LINTSTUB: Func: int _lock_cas(volatile uintptr_t *ptr, uintptr_t old, uintptr_t new);
*
* Brute force with splhigh() for now. Need to be redone as RAS.
*/
NENTRY(_lock_cas)
mov #PSL_IMASK, r2 ! 0xf0 - gets sign extended
stc sr, r3
extu.b r2, r2 ! undo sign extention
mov r3, r7 ! preserve SR
or r2, r3 ! mask all interrupts
ldc r3, sr
mov.l @r4, r1
cmp/eq r1, r5 ! T = (*ptr == old)
bf.s 1f
movt r0 ! retval = T
mov.l r6, @r4 ! *ptr = new
1:
ldc r7, sr ! restore SR (cannot be in delay slot)
rts
mov #0, r0
nop