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>
134 lines
2.8 KiB
ArmAsm
134 lines
2.8 KiB
ArmAsm
/* atomic.S: These things are too big to do inline.
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*
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* Copyright (C) 1999, 2007 2012 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/linkage.h>
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#include <asm/asi.h>
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#include <asm/backoff.h>
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.text
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/* Two versions of the atomic routines, one that
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* does not return a value and does not perform
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* memory barriers, and a second which returns
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* a value and does the barriers.
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*/
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ENTRY(atomic_add) /* %o0 = increment, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: lduw [%o1], %g1
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add %g1, %o0, %g7
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cas [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %icc, BACKOFF_LABEL(2f, 1b)
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nop
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retl
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nop
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic_add)
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ENTRY(atomic_sub) /* %o0 = decrement, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: lduw [%o1], %g1
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sub %g1, %o0, %g7
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cas [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %icc, BACKOFF_LABEL(2f, 1b)
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nop
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retl
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nop
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic_sub)
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ENTRY(atomic_add_ret) /* %o0 = increment, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: lduw [%o1], %g1
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add %g1, %o0, %g7
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cas [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %icc, BACKOFF_LABEL(2f, 1b)
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add %g1, %o0, %g1
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retl
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sra %g1, 0, %o0
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic_add_ret)
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ENTRY(atomic_sub_ret) /* %o0 = decrement, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: lduw [%o1], %g1
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sub %g1, %o0, %g7
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cas [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %icc, BACKOFF_LABEL(2f, 1b)
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sub %g1, %o0, %g1
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retl
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sra %g1, 0, %o0
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic_sub_ret)
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ENTRY(atomic64_add) /* %o0 = increment, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: ldx [%o1], %g1
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add %g1, %o0, %g7
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casx [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
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nop
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retl
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nop
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic64_add)
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ENTRY(atomic64_sub) /* %o0 = decrement, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: ldx [%o1], %g1
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sub %g1, %o0, %g7
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casx [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
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nop
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retl
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nop
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic64_sub)
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ENTRY(atomic64_add_ret) /* %o0 = increment, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: ldx [%o1], %g1
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add %g1, %o0, %g7
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casx [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
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nop
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retl
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add %g1, %o0, %o0
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic64_add_ret)
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ENTRY(atomic64_sub_ret) /* %o0 = decrement, %o1 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: ldx [%o1], %g1
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sub %g1, %o0, %g7
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casx [%o1], %g1, %g7
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cmp %g1, %g7
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bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
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nop
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retl
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sub %g1, %o0, %o0
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic64_sub_ret)
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ENTRY(atomic64_dec_if_positive) /* %o0 = atomic_ptr */
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BACKOFF_SETUP(%o2)
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1: ldx [%o0], %g1
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brlez,pn %g1, 3f
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sub %g1, 1, %g7
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casx [%o0], %g1, %g7
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cmp %g1, %g7
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bne,pn %xcc, BACKOFF_LABEL(2f, 1b)
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nop
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3: retl
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sub %g1, 1, %o0
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2: BACKOFF_SPIN(%o2, %o3, 1b)
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ENDPROC(atomic64_dec_if_positive)
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