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dtrace_cas32 and dtrace_casptr should retrn the data loaded from target

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not the new value.

Sponsored by:	ABT Systems Ltd
This commit is contained in:
Andrew Turner 2015-03-05 18:03:42 +00:00
parent 4a8169d97b
commit be9bc81174
1 changed files with 3 additions and 5 deletions
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8
sys/cddl/dev/dtrace/arm/dtrace_asm.S
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@ -208,12 +208,10 @@ EENTRY(dtrace_casptr)
1: ldrex r3, [r0] /* Load target */
cmp r3, r1 /* Check if *target == cmp */
bne 2f /* No, return */
strex r3, r2, [r0] /* Store new to target */
cmp r3, #0 /* Did the store succeed? */
strex ip, r2, [r0] /* Store new to target */
cmp ip, #0 /* Did the store succeed? */
bne 1b /* No, try again */
mov r0, r2 /* Return the new value of the store */
2: movne r0, r3 /* The first compare failed, return */
/* the value loaded from memory */
2: mov r0, r3 /* Return the value loaded from target */
RET
EEND(dtrace_casptr)
END(dtrace_cas32)