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authorPaul Mundt <lethal@linux-sh.org>2008-05-19 19:39:33 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-05-19 19:39:33 +0900
commit336f1d326831873ffab6de5fcec4b3be05103ae0 (patch)
tree832dfd3be4d03275fa0a609df47b5115fa3ebac1 /arch/sh/kernel/entry-common.S
parent9a33fc217d2248838d52f8ef214b1909073f3eb4 (diff)
sh: Fix up restorer in debug_trap exception return path.
There are a few different types of debug trap exceptions, though now that they are all going through a special jump table, the restorer needs to be unified as well. Presently this is falling through the ret_from_fork path, which more or less does the right thing on SH-3/4 whilst being completely unsuitable on MMU-less targets. Ultimately what we want here is a branch through the platform's restore_all directly, without worrying about the retval being clobbered. We can accomplish that through a branch to __restore_all directly, so switch it so we come back from the jump table and branch to the restorer. This fixes up a recursion in the nommu WARN_ON() path, as well as some other userspace nastiness where said recursion caused serious stack corruption. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/entry-common.S')
-rw-r--r--arch/sh/kernel/entry-common.S11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S
index 9a1837d5b54..718bd2356b3 100644
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -1,9 +1,6 @@
-/* $Id: entry.S,v 1.37 2004/06/11 13:02:46 doyu Exp $
- *
- * linux/arch/sh/entry.S
- *
+/*
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
- * Copyright (C) 2003 Paul Mundt
+ * Copyright (C) 2003 - 2008 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -282,7 +279,9 @@ debug_trap:
mov.l 1f, r8
add r0, r8
mov.l @r8, r8
- jmp @r8
+ jsr @r8
+ nop
+ bra __restore_all
nop
.align 2