CVS commit: [netbsd-8] src/sys/arch/m68k/m68k

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Thu Feb 25 09:38:48 UTC 2021

Modified Files:
        src/sys/arch/m68k/m68k [netbsd-8]: reenter_syscall.s

Log Message:
Pull up following revision(s) (requested by tsutsui in ticket #1659):

        sys/arch/m68k/m68k/reenter_syscall.s: revision 1.5
        sys/arch/m68k/m68k/reenter_syscall.s: revision 1.6
        sys/arch/m68k/m68k/reenter_syscall.s: revision 1.7

Replace magic numbers with proper macros prepared in assym.h.

No binary changes.

Note this is a preparation for a possible fix of PR port-m68k/55990.

Consistently use motorola style.  No binary changes.
Seems missed in rev 1.3:
 https://mail-index.netbsd.org/source-changes/2013/08/01/msg046378.html

Plug kernel stack leaks in reenter_syscall() for setcontext(2).
This fixes long standing kernel crashes (MMU fault, address error,
and silent freeze by a double bus fault etc. seen for ~10 years)
caused by kernel stack overflow, especially on x68k and sun3 running
Xorg based servers.  See PR/55990 for more details.

"This change seems perfectly reasonable" from thorpej@ and
jklos@ also reported this also solved freeze of his mac68k system
with 10 megabyes of memory.

Should be pulled up to netbsd-9 and netbsd-8.


To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.4.22.1 src/sys/arch/m68k/m68k/reenter_syscall.s

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