|
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 |