aarch64: fix context switching issues #1212
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Signed-off-by: Tianhao <[email protected]> Suggested-by: CharlyYu <[email protected]>
The generated code does not restore user sp when returning from exception handler. That's how a bug hides in plain sight. The assembler does not even give error! Signed-off-by: Tianhao <[email protected]> Suggested-by: CharlyYu <[email protected]>
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@CharlyYu may I have your Signoffs for the first two commits? since you suggested the changes. You could also push them on your own if you prefer.
(I added
Suggested-bycommit trailers, but are not recognized by github)This fixes the fork-wait issues we had.
(wip) ignore some panic conditions in PF handlerThe test programs work without issue.
Note: for the above testing program to work, take #1215 as well.