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Differential D42970

arm: Fix handling of undefined instructions in kernel mode
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Authored by markj on Dec 8 2023, 6:03 PM.

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rGbc394ad824f5: arm: Fix handling of undefined instructions in kernel mode
rGecc2e6deae71: arm: Fix handling of undefined instructions in kernel mode

Summary

Only panic if no undefined instruction handler matched the exception.
This can arise in practice if the VFP is enabled lazily.

Obtained from: Stormshield
Sponsored by: Klara, Inc.
Sponsored by: Stormshield

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Repository

rG FreeBSD src repository

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Build Status

Buildable 54864
Build 51753: arc lint + arc unit

Event Timeline

markj created this revision.Dec 8 2023, 6:03 PM

Herald added a reviewer: andrew. · View Herald TranscriptDec 8 2023, 6:03 PM

Herald added a subscriber: imp. · View Herald Transcript

markj requested review of this revision.Dec 8 2023, 6:03 PM

Harbormaster completed remote builds in B54864: Diff 131169.Dec 8 2023, 6:03 PM

markj added a parent revision: D42969: arm: Add fpu_kern_alloc_ctx().Dec 8 2023, 6:03 PM

markj added a child revision: D42971: arm: Handle VFP exceptions from the kernel.

undefinedinstruction needs some clean ups, e.g. lets hope we don't have a misaligned PC from the kernel or that fault_pc doesn't fault, but they are outside the scope of this change.

This revision is now accepted and ready to land.Dec 11 2023, 11:07 AM

Closed by commit rGecc2e6deae71: arm: Fix handling of undefined instructions in kernel mode (authored by markj). · Explain WhyDec 11 2023, 2:17 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rGecc2e6deae71: arm: Fix handling of undefined instructions in kernel mode.

markj added a commit: rGbc394ad824f5: arm: Fix handling of undefined instructions in kernel mode.Dec 18 2023, 2:12 AM

Revision Contents
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Path

Size

sys/

arm/

arm/

8 lines

Diff 131169

sys/arm/arm/undefined.c

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