diff options
| -rw-r--r-- | target-arm/op_helper.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c index c2b4bf0..e95a7f4 100644 --- a/target-arm/op_helper.c +++ b/target-arm/op_helper.c @@ -389,6 +389,7 @@ void HELPER(exception_return)(CPUARMState *env) unsigned int spsr_idx = aarch64_banked_spsr_index(1); uint32_t spsr = env->banked_spsr[spsr_idx]; int new_el, i; + int cur_el = arm_current_pl(env); if (env->pstate & PSTATE_SP) { env->sp_el[1] = env->xregs[31]; @@ -410,8 +411,11 @@ void HELPER(exception_return)(CPUARMState *env) env->regs[15] = env->elr_el[1] & ~0x1; } else { new_el = extract32(spsr, 2, 2); - if (new_el > 1) { - /* Return to unimplemented EL */ + if (new_el > cur_el + || (new_el == 2 && !arm_feature(env, ARM_FEATURE_EL2))) { + /* Disallow return to an EL which is unimplemented or higher + * than the current one. + */ goto illegal_return; } if (extract32(spsr, 1, 1)) { |
