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Differential D24931

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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F168004352: D24931.id.diff
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F167997161: D24931.id72050.diff
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F167920290: D24931.id72034.diff
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Details

Reviewers
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
Lint
Lint Not Applicable
Unit
Tests Not Applicable

Revision Contents
Changeset List

PathSize
head/
sys/
mips/
include/
1 line
mips/
55 lines
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

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