[src/trunk]: src/sys/net Most filter programs in the kernel need 3 scratch re...

[alnsn <alnsn%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/42c499a0cf09
branches:  trunk
changeset: 330422:42c499a0cf09
user:      alnsn <alnsn%NetBSD.org@localhost>
date:      Tue Jul 08 11:30:31 2014 +0000

description:
Most filter programs in the kernel need 3 scratch registers.

diffstat:

 sys/net/bpfjit.c |  14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diffs (36 lines):

diff -r 6aaeaa794840 -r 42c499a0cf09 sys/net/bpfjit.c
--- a/sys/net/bpfjit.c  Tue Jul 08 11:13:24 2014 +0000
+++ b/sys/net/bpfjit.c  Tue Jul 08 11:30:31 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bpfjit.c,v 1.21 2014/07/05 11:13:13 alnsn Exp $        */
+/*     $NetBSD: bpfjit.c,v 1.22 2014/07/08 11:30:31 alnsn Exp $        */
 
 /*-
  * Copyright (c) 2011-2014 Alexander Nasonov.
@@ -31,9 +31,9 @@
 
 #include <sys/cdefs.h>
 #ifdef _KERNEL
-__KERNEL_RCSID(0, "$NetBSD: bpfjit.c,v 1.21 2014/07/05 11:13:13 alnsn Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bpfjit.c,v 1.22 2014/07/08 11:30:31 alnsn Exp $");
 #else
-__RCSID("$NetBSD: bpfjit.c,v 1.21 2014/07/05 11:13:13 alnsn Exp $");
+__RCSID("$NetBSD: bpfjit.c,v 1.22 2014/07/08 11:30:31 alnsn Exp $");
 #endif
 
 #include <sys/types.h>
@@ -251,6 +251,14 @@
 {
        sljit_si rv = 2;
 
+#ifdef _KERNEL
+       /*
+        * Most kernel programs load packet bytes and they generate
+        * m_xword/m_xhalf/m_xbyte() calls with three arguments.
+        */
+       rv = 3;
+#endif
+
        if (hints & BJ_HINT_LDW)
                rv = 3; /* uses BJ_TMP2REG */