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PR/55990 CVS commit: [netbsd-8] src/sys/arch/m68k/m68k

The following reply was made to PR port-m68k/55990; it has been noted by GNATS.

From: "Martin Husemann" <>
Subject: PR/55990 CVS commit: [netbsd-8] src/sys/arch/m68k/m68k
Date: Thu, 25 Feb 2021 09:38:48 +0000

 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:
 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.

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