From: Helge Deller <deller@gmx.de>
Date: Fri, 18 Feb 2022 22:40:14 +0000 (+0100)
Subject: parisc/unaligned: Fix ldw() and stw() unalignment handlers
X-Git-Tag: v6.1-rc5~1955^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a97279836867b1cb50a3d4f0b1bf60e0abe6d46c;p=platform%2Fkernel%2Flinux-starfive.git

parisc/unaligned: Fix ldw() and stw() unalignment handlers

Fix 3 bugs:

a) emulate_stw() doesn't return the error code value, so faulting
instructions are not reported and aborted.

b) Tell emulate_ldw() to handle fldw_l as floating point instruction

c) Tell emulate_ldw() to handle ldw_m as integer instruction

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
---

diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index a238b7f..286cec4 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -340,7 +340,7 @@ static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
 	: "r" (val), "r" (regs->ior), "r" (regs->isr)
 	: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );
 
-	return 0;
+	return ret;
 }
 static int emulate_std(struct pt_regs *regs, int frreg, int flop)
 {
@@ -619,10 +619,10 @@ void handle_unaligned(struct pt_regs *regs)
 	{
 	case OPCODE_FLDW_L:
 		flop=1;
-		ret = emulate_ldw(regs, R2(regs->iir),0);
+		ret = emulate_ldw(regs, R2(regs->iir), 1);
 		break;
 	case OPCODE_LDW_M:
-		ret = emulate_ldw(regs, R2(regs->iir),1);
+		ret = emulate_ldw(regs, R2(regs->iir), 0);
 		break;
 
 	case OPCODE_FSTW_L: