[POWERPC] Correct masks used in emulating some instructions

When we get an illegal instruction exception, we check to see whether
the instruction is one that we emulate for the user program.  Some of
the masks we use in checking whether the offending instruction is one
we care about didn't have the top bit set, which is the MSB of the
major opcode.  Thus some undefined opcodes could get emulated as other
(defined but unimplemented) instructions.  This corrects the masks.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 125761aaa40b158624c9b23cb006ae8f9006fff3..4d0b4e74d5792113def43d9fb7735b0fbd7d50f9 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -585,14 +585,14 @@ static void parse_fpe(struct pt_regs *regs)
 #define INST_MFSPR_PVR_MASK    0xfc1fffff
 
 #define INST_DCBA              0x7c0005ec
-#define INST_DCBA_MASK         0x7c0007fe
+#define INST_DCBA_MASK         0xfc0007fe
 
 #define INST_MCRXR             0x7c000400
-#define INST_MCRXR_MASK                0x7c0007fe
+#define INST_MCRXR_MASK                0xfc0007fe
 
 #define INST_STRING            0x7c00042a
-#define INST_STRING_MASK       0x7c0007fe
-#define INST_STRING_GEN_MASK   0x7c00067e
+#define INST_STRING_MASK       0xfc0007fe
+#define INST_STRING_GEN_MASK   0xfc00067e
 #define INST_LSWI              0x7c0004aa
 #define INST_LSWX              0x7c00042a
 #define INST_STSWI             0x7c0005aa