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* atomic_test_and_set() did actually not test if the lock was lost, and

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would therefore not always work correctly.
* Minor cleanup, added return register for completeness.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28977 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2009-01-21 11:28:50 +00:00
parent cb744e5c22
commit 78e1849576
1 changed files with 12 additions and 11 deletions
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23
src/system/libroot/os/arch/ppc/atomic.S
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@ -1,14 +1,14 @@
/*
** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
** Distributed under the terms of the OpenBeOS License.
*/
* Copyright 2003-2009, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License.
*/
#define FUNCTION(x) .global x; .type x,@function; x
.text
/* int atomic_add(int *value, int increment)
* r3 r4
* (r3) r3 r4
*/
FUNCTION(atomic_add):
lost1: lwarx %r5, 0, %r3 // reserve memory address located in "r3"
@ -19,7 +19,7 @@ lost1: lwarx %r5, 0, %r3 // reserve memory address located in "r3"
blr
/* int atomic_and(int *value, int andValue)
* r3 r4
* (r3) r3 r4
*/
FUNCTION(atomic_and):
lost2: lwarx %r5, 0, %r3
@ -30,7 +30,7 @@ lost2: lwarx %r5, 0, %r3
blr
/* int atomic_or(int *value, int orValue)
* r3 r4
* (r3) r3 r4
*/
FUNCTION(atomic_or):
lost3: lwarx %r5, 0, %r3
@ -41,7 +41,7 @@ lost3: lwarx %r5, 0, %r3
blr
/* int atomic_set(int *value, int setTo)
* r3 r4
* (r3) r3 r4
*/
FUNCTION(atomic_set):
lost4: lwarx %r5, 0, %r3
@ -50,19 +50,20 @@ lost4: lwarx %r5, 0, %r3
mr %r3, %r5
blr
/* int atomic_test_and_set(int *value, int setTo, int testValue)
* r3 r4 r5
/* int atomic_test_and_set(int *value, int setTo, int testValue)
* (r3) r3 r4 r5
*/
FUNCTION(atomic_test_and_set):
lost5: lwarx %r6, 0, %r3
cmpw %r6, %r5
bne out5
stwcx. %r4, 0, %r3
bne- lost5
out5: mr %r3, %r6
blr
/* int atomic_get(int *value)
* r3
/* int atomic_get(int *value)
* (r3) r3
*/
FUNCTION(atomic_get):
lost6: lwarx %r5, 0, %r3