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List:       linux-stable-commits
Subject:    patch powerpc-fix-handling-of-stfiwx-math-emulation.patch queued to -stable tree
From:       <gregkh () suse ! de>
Date:       2007-10-31 15:05:17
Message-ID: 20071031150542.CFEEE14540D4 () imap ! suse ! de
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This is a note to let you know that we have just queued up the patch titled

     Subject: POWERPC: Fix handling of stfiwx math emulation

to the 2.6.22-stable tree.  Its filename is

     powerpc-fix-handling-of-stfiwx-math-emulation.patch

A git repo of this tree can be found at 
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary


From ba02946a903015840ef672ccc9dc8620a7e83de6 Mon Sep 17 00:00:00 2001
From: Kumar Gala <galak@kernel.crashing.org>
Date: Thu, 11 Oct 2007 17:07:34 -0500
Subject: POWERPC: Fix handling of stfiwx math emulation

From: Kumar Gala <galak@kernel.crashing.org>

patch ba02946a903015840ef672ccc9dc8620a7e83de6 in mainline

Its legal for the stfiwx instruction to have RA = 0 as part of its
effective address calculation.  This is illegal for all other XE
form instructions.

Add code to compute the proper effective address for stfiwx if
RA = 0 rather than treating it as illegal.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

--- a/arch/powerpc/math-emu/math.c
+++ b/arch/powerpc/math-emu/math.c
@@ -407,11 +407,16 @@ do_mathemu(struct pt_regs *regs)
 
 	case XE:
 		idx = (insn >> 16) & 0x1f;
-		if (!idx)
-			goto illegal;
-
 		op0 = (void *)&current->thread.fpr[(insn >> 21) & 0x1f];
-		op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
+		if (!idx) {
+			if (((insn >> 1) & 0x3ff) == STFIWX)
+				op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
+			else
+				goto illegal;
+		} else {
+			op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
+		}
+
 		break;
 
 	case XEU:


Patches currently in stable-queue which might be from galak@kernel.crashing.org are

queue-2.6.22/powerpc-fix-handling-of-stfiwx-math-emulation.patch
-
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