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MIPS16 patch in unaligned.c

To: Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
Subject: MIPS16 patch in unaligned.c
From: Carsten Langgaard <carstenl@mips.com>
Date: Wed, 04 Dec 2002 13:53:29 +0100
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
The attached patch make sure we don't try to emulate load and stores,
when running in MIPS16 mode on CPUs, which support MIPS16.
Without this patch the kernel crashes, if running something nasty like
crashme on a CPU, which support MIPS16.

/Carsten


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Index: arch/mips/kernel/unaligned.c
===================================================================
RCS file: /home/cvs/linux/arch/mips/kernel/unaligned.c,v
retrieving revision 1.15.2.7
diff -u -r1.15.2.7 unaligned.c
--- arch/mips/kernel/unaligned.c        7 Nov 2002 23:50:11 -0000       1.15.2.7
+++ arch/mips/kernel/unaligned.c        4 Dec 2002 12:37:38 -0000
@@ -494,10 +494,10 @@
 
        /*
         * Did we catch a fault trying to load an instruction?
-        * This also catches attempts to activate MIPS16 code on
-        * CPUs which don't support it.
+        * Or are we running in MIPS16 mode?
         */
-       if (regs->cp0_badvaddr == regs->cp0_epc)
+       if ((regs->cp0_badvaddr == regs->cp0_epc) ||
+           (regs->cp0_epc & 0x1))
                goto sigbus;
 
        pc = regs->cp0_epc + ((regs->cp0_cause & CAUSEF_BD) ? 4 : 0);
Index: arch/mips64/kernel/unaligned.c
===================================================================
RCS file: /home/cvs/linux/arch/mips64/kernel/unaligned.c,v
retrieving revision 1.6.2.6
diff -u -r1.6.2.6 unaligned.c
--- arch/mips64/kernel/unaligned.c      7 Nov 2002 23:50:11 -0000       1.6.2.6
+++ arch/mips64/kernel/unaligned.c      4 Dec 2002 12:37:40 -0000
@@ -494,10 +494,10 @@
 
        /*
         * Did we catch a fault trying to load an instruction?
-        * This also catches attempts to activate MIPS16 code on
-        * CPUs which don't support it.
+        * Or are we running in MIPS16 mode?
         */
-       if (regs->cp0_badvaddr == regs->cp0_epc)
+       if ((regs->cp0_badvaddr == regs->cp0_epc) ||
+           (regs->cp0_epc & 0x1))
                goto sigbus;
 
        pc = regs->cp0_epc + ((regs->cp0_cause & CAUSEF_BD) ? 4 : 0);
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