Simplify non-pti syscall entry on amd64.
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Authored by kib on Jul 19 2020, 9:54 AM.

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alc
markj

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rS363329: Simplify non-pti syscall entry on amd64.

Summary

Limit manipulations to use %rax as scratch to the pti portion of the syscall entry code.

Submitted by: alc

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rS FreeBSD src repository - subversion

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Buildable 32412

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kib created this revision.Jul 19 2020, 9:54 AM

Herald added a subscriber: imp. · View Herald TranscriptJul 19 2020, 9:54 AM

kib requested review of this revision.Jul 19 2020, 9:54 AM

Harbormaster completed remote builds in B32412: Diff 74640.Jul 19 2020, 9:54 AM

kib mentioned this in D25483: amd64 pmap: microoptimize local shootdowns for PCID PTI configurations.Jul 19 2020, 9:55 AM

Thank you.

This revision is now accepted and ready to land.Jul 19 2020, 5:05 PM

markj accepted this revision.Jul 19 2020, 5:24 PM

Closed by commit rS363329: Simplify non-pti syscall entry on amd64. (authored by kib). · Explain WhyJul 19 2020, 5:48 PM

This revision was automatically updated to reflect the committed changes.

kib added a commit: rS363329: Simplify non-pti syscall entry on amd64..

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sys/

amd64/

exception.S

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Diff 74640

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sys/amd64/amd64/exception.S

Simplify non-pti syscall entry on amd64.ClosedPublicActions