| .section ".text",#alloc,#execinstr |
| .align 8 |
| .skip 16 |
| |
| |
| /* |
| ** int _STLP_atomic_exchange (void *pvalue, int value) |
| */ |
| |
| .type _STLP_atomic_exchange,#function |
| .global _STLP_atomic_exchange |
| .align 8 |
| |
| _STLP_atomic_exchange: |
| 0: |
| ld [%o0], %o2 ! Set the current value |
| mov %o1, %o3 ! Set the new value |
| ! swap [%o0], %o3 ! Do the compare and swap |
| cas [%o0], %o2, %o3 |
| cmp %o2, %o3 ! Check whether successful |
| bne 0b ! Retry upon failure |
| stbar |
| mov %o2, %o0 ! Set the new value |
| retl ! return |
| nop |
| .size _STLP_atomic_exchange,(.-_STLP_atomic_exchange) |
| |
| /* int _STLP_atomic_increment (void *pvalue) */ |
| |
| .type _STLP_atomic_increment,#function |
| .global _STLP_atomic_increment |
| .align 8 |
| _STLP_atomic_increment: |
| 1: |
| ld [%o0], %o2 ! set the current |
| add %o2, 0x1, %o3 ! Increment and store current |
| ! swap [%o0], %o3 ! Do the compare and swap |
| cas [%o0], %o2, %o3 |
| cmp %o3, %o2 ! Check whether successful |
| bne 1b ! Retry if we failed. |
| membar #LoadLoad | #LoadStore ! Ensure the cas finishes before |
| ! returning |
| nop |
| retl ! return |
| nop |
| |
| .size _STLP_atomic_increment,(.-_STLP_atomic_increment) |
| |
| |
| /* int _STLP_atomic_decrement (void *pvalue) */ |
| .type _STLP_atomic_decrement,#function |
| .global _STLP_atomic_decrement |
| .align 8 |
| |
| _STLP_atomic_decrement: |
| 2: |
| ld [%o0], %o2 ! set the current |
| sub %o2, 0x1, %o3 ! decrement and store current |
| ! swap [%o0], %o3 ! Do the compare and swap |
| cas [%o0], %o2, %o3 |
| cmp %o3, %o2 ! Check whether successful |
| bne 2b ! Retry if we failed. |
| membar #LoadLoad | #LoadStore ! Ensure the cas finishes before |
| nop |
| ! returning |
| retl ! return |
| nop |
| .size _STLP_atomic_decrement,(.-_STLP_atomic_decrement) |
