CVS commit: src/sys/arch/sparc/sparc

["Valeriy E. Ushakov" <uwe%netbsd.org@localhost>]

Module Name:    src
Committed By:   uwe
Date:           Wed Dec  9 04:02:20 UTC 2020

Modified Files:
        src/sys/arch/sparc/sparc: pmap.c

Log Message:
sp_tlb_flush() - fix inline asm miscompiled by newer gcc versions.

As one national park director once said: "my problems start when the
dumber of my visitors meet the smarter of my bears".

Old inline asm used specific hardcoded registers "assuming that gcc
doesn't do anything funny with these".  Unfortunately now it does,
especially when this function is inlined.  We ended up restoring a
wrong context.  The result was mysterious infinite memory faults.

Rewrite in safer inline asm, so that gcc is not confused.

Many thanks to chs@ for his patience.


To generate a diff of this commit:
cvs rdiff -u -r1.367 -r1.368 src/sys/arch/sparc/sparc/pmap.c

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