ARM: kprobes: Fix emulation of Data-processing (immediate) instructions
Emulation of instructions like "ADD rd, rn, #<const>" would result in a
corrupted value for rd.
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 ee29d33..baf053e 100644
--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -1207,7 +1207,7 @@
* *S (bit 20) updates condition codes
* ADC/SBC/RSC reads the C flag
*/
- insn &= 0xffff0fff; /* Rd = r0 */
+ insn &= 0xfff00fff; /* Rn = r0 and Rd = r0 */
asi->insn[0] = insn;
if ((insn & 0x0f900000) == 0x03100000) {