diff options
Diffstat (limited to '')
| -rw-r--r-- | demo/atomic.S (renamed from demo/lock.S) | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/demo/lock.S b/demo/atomic.S index 51805f2..991ad5a 100644 --- a/demo/lock.S +++ b/demo/atomic.S @@ -28,3 +28,23 @@ spin_unlock: str r2, [r0] msr cpsr_c, r1 mov pc, lr + +.global compare_exchange_64 +compare_exchange_64: + push {r4, r5, r6, r7, r8} + ldr r4, [r1] + ldr r5, [r1, #4] + add r8, r0, #4 + ldrex r6, [r0] + ldrex r7, [r8] + teq r4, r6 + teqeq r5, r7 + strexeq r4, r2, [r0] + strexeq r4, r3, [r8] + teqeq r4, #0 + moveq r0, #1 + movne r0, #0 + strne r6, [r1] + strne r7, [r1, #4] + pop {r4, r5, r6, r7, r8} + mov pc, lr |