Properly set the return value for casueword to 0 upon success.
While trying to get multithreading working for CloudABI on aarch64, I noticed that compare-and-exchange operations in kernelspace would always fail. It turns out that we don't properly set the return value to 0 when the compare and exchange succeeds. Approved by: andrew Differential Revision: https://reviews.freebsd.org/D3899
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=289373
@ -59,6 +59,7 @@ ENTRY(casueword32)
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ldrb w0, [x0] /* Try loading the data */
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2: SET_FAULT_HANDLER(xzr, x5) /* Reset the fault handler */
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str w4, [x2] /* Store the read data */
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mov x0, #0 /* Success */
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ret /* Return */
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END(casueword32)
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@ -76,6 +77,7 @@ ENTRY(casueword)
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ldrb w0, [x0] /* Try loading the data */
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2: SET_FAULT_HANDLER(xzr, x5) /* Reset the fault handler */
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str x4, [x2] /* Store the read data */
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mov x0, #0 /* Success */
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ret /* Return */
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END(casueword)
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