193d2aadc0
Sparc32 already supported it, as a consequence of using the generic atomic64 implementation. And the sparc64 implementation is rather trivial. This allows us to set ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE for all of sparc, and avoid the annoying warning from lib/atomic64_test.c Signed-off-by: David S. Miller <davem@davemloft.net>
133 lines
2.8 KiB
ArmAsm
133 lines
2.8 KiB
ArmAsm
/* atomic.S: These things are too big to do inline.
|
|
*
|
|
* Copyright (C) 1999, 2007 2012 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asi.h>
|
|
#include <asm/backoff.h>
|
|
|
|
.text
|
|
|
|
/* Two versions of the atomic routines, one that
|
|
* does not return a value and does not perform
|
|
* memory barriers, and a second which returns
|
|
* a value and does the barriers.
|
|
*/
|
|
ENTRY(atomic_add) /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic_add)
|
|
|
|
ENTRY(atomic_sub) /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic_sub)
|
|
|
|
ENTRY(atomic_add_ret) /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, BACKOFF_LABEL(2f, 1b)
|
|
add %g1, %o0, %g1
|
|
retl
|
|
sra %g1, 0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic_add_ret)
|
|
|
|
ENTRY(atomic_sub_ret) /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, BACKOFF_LABEL(2f, 1b)
|
|
sub %g1, %o0, %g1
|
|
retl
|
|
sra %g1, 0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic_sub_ret)
|
|
|
|
ENTRY(atomic64_add) /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic64_add)
|
|
|
|
ENTRY(atomic64_sub) /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic64_sub)
|
|
|
|
ENTRY(atomic64_add_ret) /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
retl
|
|
add %g1, %o0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic64_add_ret)
|
|
|
|
ENTRY(atomic64_sub_ret) /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
retl
|
|
sub %g1, %o0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic64_sub_ret)
|
|
|
|
ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o0], %g1
|
|
brlez,pn %g1, 3f
|
|
sub %g1, 1, %g7
|
|
casx [%o0], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
|
|
nop
|
|
3: retl
|
|
sub %g1, 1, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
ENDPROC(atomic64_dec_if_positive)
|