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04c334c94b
git-svn-id: https://unknownworlds.svn.cloudforge.com/ns1@15 67975925-1194-0748-b3d5-c16f83f1a3a1
68 lines
2.6 KiB
ArmAsm
68 lines
2.6 KiB
ArmAsm
.section ".text",#alloc,#execinstr
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.align 8
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.skip 16
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/*
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** int _STLP_atomic_exchange (void *pvalue, int value)
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*/
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.type _STLP_atomic_exchange,#function
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.global _STLP_atomic_exchange
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.align 8
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_STLP_atomic_exchange:
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0:
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ld [%o0], %o2 ! Set the current value
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mov %o1, %o3 ! Set the new value
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! swap [%o0], %o3 ! Do the compare and swap
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cas [%o0], %o2, %o3
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cmp %o2, %o3 ! Check whether successful
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bne 0b ! Retry upon failure
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stbar
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mov %o2, %o0 ! Set the new value
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retl ! return
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nop
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.size _STLP_atomic_exchange,(.-_STLP_atomic_exchange)
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/* int _STLP_atomic_increment (void *pvalue) */
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.type _STLP_atomic_increment,#function
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.global _STLP_atomic_increment
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.align 8
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_STLP_atomic_increment:
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1:
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ld [%o0], %o2 ! set the current
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add %o2, 0x1, %o3 ! Increment and store current
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! swap [%o0], %o3 ! Do the compare and swap
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cas [%o0], %o2, %o3
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cmp %o3, %o2 ! Check whether successful
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bne 1b ! Retry if we failed.
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membar #LoadLoad | #LoadStore ! Ensure the cas finishes before
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! returning
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nop
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retl ! return
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nop
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.size _STLP_atomic_increment,(.-_STLP_atomic_increment)
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/* int _STLP_atomic_decrement (void *pvalue) */
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.type _STLP_atomic_decrement,#function
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.global _STLP_atomic_decrement
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.align 8
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_STLP_atomic_decrement:
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2:
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ld [%o0], %o2 ! set the current
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sub %o2, 0x1, %o3 ! decrement and store current
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! swap [%o0], %o3 ! Do the compare and swap
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cas [%o0], %o2, %o3
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cmp %o3, %o2 ! Check whether successful
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bne 2b ! Retry if we failed.
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membar #LoadLoad | #LoadStore ! Ensure the cas finishes before
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nop
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! returning
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retl ! return
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nop
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.size _STLP_atomic_decrement,(.-_STLP_atomic_decrement)
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