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Differential D34302

Add NT_ARM_ADDR_MASK
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Authored by andrew on Feb 16 2022, 3:47 PM.
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imp
val_packett.cool

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jhb
kib
manu
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arm64
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rG6713be315900: Add NT_ARM_ADDR_MASK
Summary

This can be used by debuggers to find which bits in a virtual address
should be masked off to get a canonical address. This is currently used
by the Pointer Authentication Code support to get its mask. It could also
be used if we support Top Byte Ignore for the same purpose.

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rS FreeBSD src repository - subversion
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Buildable 44480
Build 41368: arc lint + arc unit

Event Timeline

andrew created this revision.Feb 16 2022, 3:47 PM
Herald added a reviewer: manu. · View Herald TranscriptFeb 16 2022, 3:47 PM
Herald added subscribers: emaste, imp. · View Herald Transcript
andrew requested review of this revision.Feb 16 2022, 3:47 PM
Harbormaster completed remote builds in B44480: Diff 102842.Feb 16 2022, 3:47 PM
emaste added inline comments.Feb 16 2022, 3:52 PM
sys/sys/elf_common.h
828

fwiw I in Linux I see #define NT_ARM_PAC_MASK 0x406

andrew added inline comments.Feb 16 2022, 3:59 PM
sys/sys/elf_common.h
828

They both provide a mask, with the addition of possible a TBI mask on hardware without PAC in the future

kib accepted this revision.Feb 16 2022, 4:12 PM
This revision is now accepted and ready to land.Feb 16 2022, 4:12 PM
val_packett.cool added a subscriber: val_packett.cool.Feb 16 2022, 5:04 PM

It could also be used if we support Top Byte Ignore for the same purpose

Nice. I have experimented with TBI a few years ago — D20835. HWASAN was pretty easy to get working.

Closed by commit rG6713be315900: Add NT_ARM_ADDR_MASK (authored by andrew). · Explain WhyFeb 22 2022, 5:27 PM
This revision was automatically updated to reflect the committed changes.
andrew added a commit: rG6713be315900: Add NT_ARM_ADDR_MASK.

Revision Contents
Changeset List

PathSize
sys/
arm64/
arm64/
42 lines
8 lines
include/
3 lines
5 lines
3 lines
sys/
1 line
tests/
sys/
kern/
13 lines

Diff 102842

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sys/arm64/arm64/elf_machdep.c

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sys/arm64/arm64/ptrauth.c

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sys/arm64/include/cpu.h

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sys/arm64/include/reg.h

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sys/arm64/include/vmparam.h

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sys/sys/elf_common.h

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tests/sys/kern/ptrace_test.c

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