Cortex-A53 GCC erratum compiler options

To: port-arm%NetBSD.org@localhost
Subject: Cortex-A53 GCC erratum compiler options
From: Sad Clouds <cryintothebluesky%gmail.com@localhost>
Date: Thu, 26 Sep 2019 08:14:32 +0100

Hello, GCC for AArch64 has the following compiler options to work
around Cortex-A53 CPU bugs. I assume they are not enabled by default by
GCC.

Anyone knows if these options should always be enabled when building
software for this CPU? If yes, does NetBSD already enable them for
kernel and userland programs? If it doesn't, then should it?


-mfix-cortex-a53-835769
-mno-fix-cortex-a53-835769
Enable or disable the workaround for the ARM Cortex-A53 erratum number
835769. This involves inserting a NOP instruction between memory
instructions and 64-bit integer multiply-accumulate instructions.

-mfix-cortex-a53-843419
-mno-fix-cortex-a53-843419
Enable or disable the workaround for the ARM Cortex-A53 erratum number
843419. This erratum workaround is made at link time and this will only
pass the corresponding flag to the linker.

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