CVS commit: src/sys/arch/aarch64

["Ryo Shimizu" <ryo%netbsd.org@localhost>]

Module Name:    src
Committed By:   ryo
Date:           Fri Dec 20 07:16:43 UTC 2019

Modified Files:
        src/sys/arch/aarch64/aarch64: cpuswitch.S
        src/sys/arch/aarch64/include: asm.h

Log Message:
Add a speculation barrier after the 'eret'.

Some aarch64 cpus speculatively execute instructions after 'eret',
and this potentiates side-channel attack.

from
 https://github.com/torvalds/linux/commit/679db70801da9fda91d26caf13bf5b5ccc74e8e8


To generate a diff of this commit:
cvs rdiff -u -r1.12 -r1.13 src/sys/arch/aarch64/aarch64/cpuswitch.S
cvs rdiff -u -r1.4 -r1.5 src/sys/arch/aarch64/include/asm.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.