use MD #define to choose stackgap size per-architecture. on sparc, special

case sun4c/sun4 -- because address space is more constrained

2 files changed, 12 insertions, 2 deletions

diff --git a/sys/arch/sparc/include/vmparam.h b/sys/arch/sparc/include/vmparam.h
index a8ab4d3540d..dc35ede11e3 100644
--- a/sys/arch/sparc/include/vmparam.h
+++ b/sys/arch/sparc/include/vmparam.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vmparam.h,v 1.29 2004/11/28 01:36:39 mickey Exp $	*/
+/*	$OpenBSD: vmparam.h,v 1.30 2005/04/11 15:13:01 deraadt Exp $	*/
 /*	$NetBSD: vmparam.h,v 1.13 1997/07/12 16:20:03 perry Exp $	*/
 
 /*
@@ -74,6 +74,9 @@
 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
 #endif
 
+#define STACKGAP_RANDOM	64*1024
+#define STACKGAP_RANDOM_SUN4M 256*1024
+
 /*
  * Size of shared memory map
  */
diff --git a/sys/arch/sparc/sparc/machdep.c b/sys/arch/sparc/sparc/machdep.c
index 693e6725b00..ec45d7fad67 100644
--- a/sys/arch/sparc/sparc/machdep.c
+++ b/sys/arch/sparc/sparc/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.104 2005/03/23 17:14:46 miod Exp $	*/
+/*	$OpenBSD: machdep.c,v 1.105 2005/04/11 15:13:01 deraadt Exp $	*/
 /*	$NetBSD: machdep.c,v 1.85 1997/09/12 08:55:02 pk Exp $ */
 
 /*
@@ -73,6 +73,7 @@
 #include <machine/frame.h>
 #include <machine/cpu.h>
 #include <machine/pmap.h>
+#include <machine/vmparam.h>
 #include <machine/oldmon.h>
 #include <machine/bsd_openprom.h>
 
@@ -169,6 +170,12 @@ cpu_startup()
 	pmapdebug = 0;
 #endif
 
+	if (CPU_ISSUN4M) {
+		extern int stackgap_random;
+
+		stackgap_random = STACKGAP_RANDOM_SUN4M;
+	}
+
 	/*
 	 * fix message buffer mapping, note phys addr of msgbuf is 0
 	 */