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

===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v
retrieving revision 1.63
retrieving revision 1.64
diff -u -p -r1.63 -r1.64
--- src/sys/arch/i386/i386/locore.S	2008/01/13 11:03:04	1.63
+++ src/sys/arch/i386/i386/locore.S	2008/01/20 12:43:00	1.64
@@ -1,4 +1,4 @@
-/*	$NetBSD: locore.S,v 1.63 2008/01/13 11:03:04 bouyer Exp $	*/
+/*	$NetBSD: locore.S,v 1.64 2008/01/20 12:43:00 skrll Exp $	*/
 
 /*
  * Copyright-o-rama!
@@ -141,7 +141,7 @@
  */
 
 #include <machine/asm.h>
-__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.63 2008/01/13 11:03:04 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.64 2008/01/20 12:43:00 skrll Exp $");
 
 #include "opt_compat_oldboot.h"
 #include "opt_ddb.h"
@@ -880,6 +880,24 @@ ENTRY(longjmp)
 	movl	$1,%eax			# return 1
 	ret
 
+ENTRY(dumpsys)
+	# mimic cpu_switchto() for postmortem debugging.
+
+	# build a fake switch frame.
+	pushl	%ebx
+	pushl	%esi
+	pushl	%edi
+
+	# save a context.
+	movl	$dumppcb,%eax
+	movl	%esp,PCB_ESP(%eax)
+	movl	%ebp,PCB_EBP(%eax)
+
+	call	_C_LABEL(dodumpsys)
+
+	addl	$(3*4), %esp	# sizeof(switchframe) - sizeof(%eip)
+	ret
+
 /*
  * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp,
  *			    bool returning)