1 .section ".text",#alloc,#execinstr 2 .align 8 3 .skip 16 4 5 ! int _STLP_atomic_exchange (void *pvalue, int value) 6 ! 7 8 .type _STLP_atomic_exchange,#function 9 .global _STLP_atomic_exchange 10 .align 8 11 12 _STLP_atomic_exchange: 13 1: 14 ldx [%o0], %o2 ! Set the current value 15 mov %o1, %o3 ! Set the new value 16 casx [%o0], %o2, %o3 ! Do the compare and swap 17 cmp %o2, %o3 ! Check whether successful 18 bne 1b ! Retry upon failure 19 membar #LoadLoad | #LoadStore ! Ensure the cas finishes before 20 ! returning 21 retl ! return 22 mov %o2, %o0 ! Set the new value 23 .size _STLP_atomic_exchange,(.-_STLP_atomic_exchange) 24 25 26 ! int _STLP_atomic_increment (void *pvalue) 27 28 .type _STLP_atomic_increment,#function 29 .global _STLP_atomic_increment 30 .align 8 31 _STLP_atomic_increment: 32 0: 33 ldx [%o0], %o2 ! set the current 34 addx %o2, 0x1, %o3 ! Increment and store current 35 casx [%o0], %o2, %o3 ! Do the compare and swap 36 cmp %o3, %o2 ! Check whether successful 37 bne 0b 38 membar #LoadLoad | #LoadStore ! Ensure the cas finishes before 39 ! returning 40 retl ! return 41 mov %o1, %o0 ! Set the return value 42 43 .size _STLP_atomic_increment,(.-_STLP_atomic_increment) 44 45 46 ! /* int _STLP_atomic_decrement (void *pvalue) */ 47 .type _STLP_atomic_decrement,#function 48 .global _STLP_atomic_decrement 49 .align 8 50 51 _STLP_atomic_decrement: 52 0: 53 ldx [%o0], %o2 ! set the current 54 subx %o2, 0x1, %o3 ! decrement and store current 55 casx [%o0], %o2, %o3 ! Do the compare and swap 56 cmp %o3, %o2 ! Check whether successful 57 bne 0b 58 membar #LoadLoad | #LoadStore ! Ensure the cas finishes before 59 ! returning 60 retl ! return 61 nop 62 .size _STLP_atomic_decrement,(.-_STLP_atomic_decrement) 63 64 65 66
