kprobes/arm: fix decoding of arithmetic immediate instructions
The ARM kprobes arithmetic immediate instruction decoder
(space_cccc_001x()) was accidentally zero'ing out not only the Rn and
Rd arguments, but the lower nibble of the immediate argument as well
-- this patch fixes this.
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Nicolas Pitre <nico@marvell.com>
diff --git a/arch/arm/kernel/kprobes-decode.c b/arch/arm/kernel/kprobes-decode.c
index d51bc8b..b4565bb 100644
--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -1176,7 +1176,7 @@
* *S (bit 20) updates condition codes
* ADC/SBC/RSC reads the C flag
*/
- insn &= 0xfff00ff0; /* Rn = r0, Rd = r0 */
+ insn &= 0xfff00fff; /* Rn = r0, Rd = r0 */
asi->insn[0] = insn;
asi->insn_handler = (insn & (1 << 20)) ? /* S-bit */
emulate_alu_imm_rwflags : emulate_alu_imm_rflags;
