Simplify hot-patching cpu_switch() for lack of UserLocal register.
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Authored by jhb on May 20 2020, 5:21 PM.

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brooks
alfredo.mazzinghi_cl.cam.ac.uk

Commits

rS361296: Simplify hot-patching cpu_switch() for lack of UserLocal register.

Summary

Rather than walking all of cpu_switch looking for the sequence of
instructions to patch, add a global label at the location that needs
the patch applied.

Test Plan

booted mips64 under QEMU which does not implement UL and requires the hot patching to work

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Tests Not Applicable

Event Timeline

jhb requested review of this revision.May 20 2020, 5:21 PM

jhb created this revision.

Harbormaster completed remote builds in B31202: Diff 72034.May 20 2020, 5:21 PM

Looks good to me.

This revision is now accepted and ready to land.May 20 2020, 5:53 PM

brooks accepted this revision.May 20 2020, 6:34 PM

Closed by commit rS361296: Simplify hot-patching cpu_switch() for lack of UserLocal register. (authored by jhb). · Explain WhyMay 20 2020, 9:16 PM

This revision was automatically updated to reflect the committed changes.

jhb added a commit: rS361296: Simplify hot-patching cpu_switch() for lack of UserLocal register..

Herald added a subscriber: imp. · View Herald TranscriptMay 20 2020, 9:16 PM

Revision Contents
Changeset List

Path

Size

head/

sys/

mips/

include/

md_var.h

1 line

mips/

cpu.c

55 lines

swtch.S

2 lines

Diff 72050

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head/sys/mips/include/md_var.h

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head/sys/mips/mips/cpu.c

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head/sys/mips/mips/swtch.S

Simplify hot-patching cpu_switch() for lack of UserLocal register.ClosedPublicActions

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Revision ContentsChangeset List

Diff 72050

head/sys/mips/include/md_var.h

head/sys/mips/mips/cpu.c

head/sys/mips/mips/swtch.S

Simplify hot-patching cpu_switch() for lack of UserLocal register.
ClosedPublic
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Revision Contents
Changeset List