[src/trunk]: src/sys/arch/arm/arm32 Fix register usage in softint_switch. lo...

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

details:   https://anonhg.NetBSD.org/src/rev/6c42321314bd
branches:  trunk
changeset: 806983:6c42321314bd
user:      matt <matt%NetBSD.org@localhost>
date:      Sun Mar 22 23:46:08 2015 +0000

description:
Fix register usage in softint_switch.  load / restore l_private across
softint_dispatch

diffstat:

 sys/arch/arm/arm32/cpuswitch.S |  15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

diffs (43 lines):

diff -r 72197187de80 -r 6c42321314bd sys/arch/arm/arm32/cpuswitch.S
--- a/sys/arch/arm/arm32/cpuswitch.S    Sun Mar 22 23:17:57 2015 +0000
+++ b/sys/arch/arm/arm32/cpuswitch.S    Sun Mar 22 23:46:08 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpuswitch.S,v 1.86 2015/03/22 23:17:57 matt Exp $      */
+/*     $NetBSD: cpuswitch.S,v 1.87 2015/03/22 23:46:08 matt Exp $      */
 
 /*
  * Copyright 2003 Wasabi Systems, Inc.
@@ -87,7 +87,7 @@
 #include <arm/asm.h>
 #include <arm/locore.h>
 
-       RCSID("$NetBSD: cpuswitch.S,v 1.86 2015/03/22 23:17:57 matt Exp $")
+       RCSID("$NetBSD: cpuswitch.S,v 1.87 2015/03/22 23:46:08 matt Exp $")
 
 /* LINTSTUB: include <sys/param.h> */
        
@@ -403,7 +403,12 @@
         * set in userland.
         */
        mrc     p15, 0, r0, c13, c0, 2
-       str     r0, [r5, #(PCB_USER_PID_RW)]
+       str     r0, [r2, #(PCB_USER_PID_RW)]
+       /*
+        * Now restore l_private for the softint thread.
+        */
+       ldr     r0, [r5, #(L_PRIVATE)]
+       mcr     p15, 0, r0, c13, c0, 3
 #endif
 
        /* this is an invariant so load before disabling intrs */
@@ -438,6 +443,10 @@
        /*
         * If we've returned, we need to change everything back and return.
         */
+#ifdef _ARM_ARCH_6
+       ldr     r0, [r4, #(L_PRIVATE)]  /* get pinned lwp's l_private */
+       mcr     p15, 0, r0, c13, c0, 3  /* and restore it */
+#endif
        ldr     r2, [r4, #(L_PCB)]      /* get pinned lwp's pcb */
 
 #ifndef __HAVE_UNNESTED_INTRS