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-rw-r--r--src/target/arm_simulator.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/target/arm_simulator.c b/src/target/arm_simulator.c
index 217633e8..b21ea4a8 100644
--- a/src/target/arm_simulator.c
+++ b/src/target/arm_simulator.c
@@ -415,7 +415,12 @@ int arm_simulate_step(target_t *target, u32 *dry_run_pc)
u8 carry_out;
Rd = 0x0;
- Rn = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, instruction.info.data_proc.Rn).value, 0, 32);
+ /* ARM_MOV and ARM_MVN does not use Rn */
+ if ((instruction.type != ARM_MOV) && (instruction.type != ARM_MVN))
+ Rn = buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, instruction.info.data_proc.Rn).value, 0, 32);
+ else
+ Rn = 0;
+
shifter_operand = arm_shifter_operand(armv4_5, instruction.info.data_proc.variant, instruction.info.data_proc.shifter_operand, &carry_out);
/* adjust Rn in case the PC is being read */
@@ -446,6 +451,8 @@ int arm_simulate_step(target_t *target, u32 *dry_run_pc)
Rd = shifter_operand;
else if (instruction.type == ARM_MVN)
Rd = ~shifter_operand;
+ else
+ LOG_WARNING("unhandled instruction type");
if (dry_run_pc)
{