ARM: kprobes: Add emulation of RBIT instruction

The v6T2 RBIT instruction was accidentally being emulated correctly,
this patch adds correct decoding for the instruction.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>

diff --git a/arch/arm/kernel/kprobes-decode.c b/arch/arm/kernel/kprobes-decode.c
index a37745f2abba74a3f479a1dca7321c25de87bd75..b6bbc0b5ecd6adffa45639d85b5bf2212b6f3a70 100644 (file)
--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -1320,9 +1320,10 @@ space_cccc_0110__1(kprobe_opcode_t insn, struct arch_specific_insn *asi)
 
        /* REV    : cccc 0110 1011 xxxx xxxx xxxx 0011 xxxx */
        /* REV16  : cccc 0110 1011 xxxx xxxx xxxx 1011 xxxx */
+       /* RBIT   : cccc 0110 1111 xxxx xxxx xxxx 0011 xxxx */
        /* REVSH  : cccc 0110 1111 xxxx xxxx xxxx 1011 xxxx */
        if ((insn & 0x0ff00070) == 0x06b00030 ||
-           (insn & 0x0ff000f0) == 0x06f000b0)
+           (insn & 0x0ff00070) == 0x06f00030)
                return prep_emulate_rd12rm0(insn, asi);
 
        /* SADD16    : cccc 0110 0001 xxxx xxxx xxxx 0001 xxxx :GE */