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# mach: bpf
# output: pass\nexit 0 (0x0)\n
/* xadd.s
Tests for BPF atomic exchange-and-add instructions in simulator
The xadd instructions (XADDW, XADDDW) operate on a memory location
specified in $dst + offset16, atomically adding the value in $src.
In the simulator, there isn't anything else happening. The atomic
instructions are identical to a non-atomic load/add/store. */
.include "testutils.inc"
.text
.global main
.type main, @function
main:
mov %r1, 0x1000
mov %r2, 5
/* basic xadd w */
stw [%r1+0], 10
xaddw [%r1+0], %r2
ldxw %r3, [%r1+0]
fail_ne %r3, 15
/* basic xadd dw */
stdw [%r1+8], 42
xadddw [%r1+8], %r2
ldxdw %r3, [%r1+8]
fail_ne %r3, 47
/* xadd w negative value */
mov %r4, -1
xaddw [%r1+0], %r4
ldxw %r3, [%r1+0]
fail_ne %r3, 14
/* xadd dw negative val */
xadddw [%r1+8], %r4
ldxdw %r3, [%r1+8]
fail_ne %r3, 46
pass
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