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

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

Lint
Lint Passed
Unit
No Test Coverage
Build Status
Buildable 33393
Build 30692: arc lint + arc unit