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Differential D28132

Handle functions that use a nop in the arm64 fbt
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Authored by andrew on Jan 13 2021, 11:22 AM.
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rwatson
gnn
manu
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arm64
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rGefe35aecb801: Handle functions that use a nop in the arm64 fbt
rG28d945204ea1: Handle functions that use a nop in the arm64 fbt
Summary

To trace leaf asm functions we can insert a single nop instruction as
the first instruction in a function and trigger off this.

Sponsored by: Innovate UK

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rG FreeBSD src repository
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Event Timeline

andrew created this revision.Jan 13 2021, 11:22 AM
Herald added a reviewer: gnn. · View Herald TranscriptJan 13 2021, 11:22 AM
Herald added a reviewer: manu. · View Herald Transcript
Herald added subscribers: emaste, imp. · View Herald Transcript
Harbormaster completed remote builds in B36165: Diff 82202.Jan 13 2021, 11:22 AM
andrew requested review of this revision.Jan 13 2021, 11:22 AM
andrew added a comment.Jan 13 2021, 11:30 AM

Tested with dtrace -n ":::". This will trigger on memcpy as called by dtrace_getnanouptime, however it seems to be inlined by the in tree clang.

gnn accepted this revision.Jan 13 2021, 6:00 PM
This revision is now accepted and ready to land.Jan 13 2021, 6:00 PM
Closed by commit rG28d945204ea1: Handle functions that use a nop in the arm64 fbt (authored by andrew). · Explain WhyMar 3 2021, 2:27 PM
This revision was automatically updated to reflect the committed changes.
andrew added a commit: rG28d945204ea1: Handle functions that use a nop in the arm64 fbt.
andrew added a commit: rGefe35aecb801: Handle functions that use a nop in the arm64 fbt.Feb 22 2022, 4:40 PM

Revision Contents
Changeset List

PathSize
sys/
arm64/
include/
8 lines
cddl/
contrib/
opensolaris/
uts/
common/
sys/
2 lines
dev/
dtrace/
aarch64/
5 lines
fbt/
aarch64/
51 lines

Diff 85051

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sys/arm64/include/asm.h

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sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h

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sys/cddl/dev/dtrace/aarch64/dtrace_subr.c

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sys/cddl/dev/fbt/aarch64/fbt_isa.c

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