[patch 04/39] powerpc/vsx: Fix VSX alignment handler for regs 32-63

From: Greg KH
Date: Wed Feb 18 2009 - 16:37:17 EST


2.6.28-stable review patch. If anyone has any objections, please let us know.

------------------

From: Michael Neuling <mikey@xxxxxxxxxxx>

commit 26456dcfb8d8e43b1b64b2a14710694cf7a72f05 upstream.

Fix the VSX alignment handler for VSX registers > 32. 32-63 are stored
in the VMX part of the thread_struct not the FPR part.

Signed-off-by: Michael Neuling <mikey@xxxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
arch/powerpc/kernel/align.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/arch/powerpc/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -646,11 +646,16 @@ static int emulate_vsx(unsigned char __u
unsigned int areg, struct pt_regs *regs,
unsigned int flags, unsigned int length)
{
- char *ptr = (char *) &current->thread.TS_FPR(reg);
+ char *ptr;
int ret = 0;

flush_vsx_to_thread(current);

+ if (reg < 32)
+ ptr = (char *) &current->thread.TS_FPR(reg);
+ else
+ ptr = (char *) &current->thread.vr[reg - 32];
+
if (flags & ST)
ret = __copy_to_user(addr, ptr, length);
else {

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