Add test code for synchronizing caches for signal trampoline code

regress/sys/kern/Makefile

@@ -1,5 +1,5 @@
-#	$NetBSD: Makefile,v 1.7 1999/06/02 15:57:18 drochner Exp $
+#	$NetBSD: Makefile,v 1.8 1999/07/08 17:37:35 ws Exp $
 
-SUBDIR+= execve extent unfdpass getcwd
+SUBDIR+= execve extent unfdpass getcwd sigtramp
 
 .include <bsd.subdir.mk>

regress/sys/kern/sigtramp/Makefile

@@ -0,0 +1,10 @@
+#	$NetBSD: Makefile,v 1.1 1999/07/08 17:37:36 ws Exp $
+#
+PROG=	sigtramp
+MKMAN=	no
+LDFLAGS= -static -N
+
+regress:
+	sh ${.CURDIR}/dotest
+
+.include <bsd.prog.mk>

regress/sys/kern/sigtramp/dotest

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+# Do a bunch of runs of this program
+
+for i in 0 1 2 3 4 5 6 7 8 9
+do
+for j in 0 1 2 3 4 5 6 7 8 9
+do
+for k in 0 1 2 3 4 5 6 7 8 9
+do
+	if ./sigtramp
+	then
+		:
+	else
+		exit 1
+	fi
+done
+done
+done

regress/sys/kern/sigtramp/sigtramp.c

@@ -0,0 +1,22 @@
+/*
+ * This program checks whether the kernel correctly synchronizes
+ * I&D-caches after copying out the signal trampoline code.
+ */
+#include <signal.h>
+
+void catch(sig)
+int sig;
+{
+	return;
+}
+
+main()
+{
+	static struct sigaction sa;
+
+	sa.sa_handler = catch;
+
+	sigaction(SIGUSR1, &sa, 0);
+	kill(getpid(), SIGUSR1);
+	return 0;
+}