Maintain a stack alignment of 16-bytes.
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Authored by brooks on Sep 4 2020, 5:55 PM.

Details

Reviewers

mhorne
br
jrtc27

Commits

rS365342: Maintain a stack alignment of 16-bytes.

Summary

This violated the RISC-V 64-bit ABI. On CheriBSD this manifested as
a trap when attempting to store 16-byte aligned types while zeroing
the stack.

Test Plan

works in CheriBSD

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

brooks created this revision.Sep 4 2020, 5:55 PM

Herald added a subscriber: bdragon. · View Herald TranscriptSep 4 2020, 5:55 PM

brooks requested review of this revision.Sep 4 2020, 5:55 PM

Harbormaster completed remote builds in B33393: Diff 76654.Sep 4 2020, 5:55 PM

I'm not very familiar with rtld, but this seems correct.

This revision is now accepted and ready to land.Sep 4 2020, 6:47 PM

br accepted this revision.Sep 4 2020, 8:20 PM

Closed by commit rS365342: Maintain a stack alignment of 16-bytes. (authored by brooks). · Explain WhySep 4 2020, 9:46 PM

This revision was automatically updated to reflect the committed changes.

brooks added a commit: rS365342: Maintain a stack alignment of 16-bytes..

Herald added a subscriber: imp. · View Herald TranscriptSep 4 2020, 9:46 PM

brooks mentioned this in D26328: Round TF_SIZE up to the stack alignment (16-bytes)..Sep 4 2020, 9:55 PM

Revision Contents
Changeset List

Path

Size

head/

libexec/

rtld-elf/

riscv/

rtld_start.S

5 lines

Diff 76674

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head/libexec/rtld-elf/riscv/rtld_start.S

Maintain a stack alignment of 16-bytes.ClosedPublicActions