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target-arm: A64: Forbid ERET to higher or unimplemented ELs

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Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1400980132-25949-18-git-send-email-edgar.iglesias@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Edgar E. Iglesias 2014-05-27 17:09:53 +01:00 committed by Peter Maydell
parent 81547d6630
commit 7ab6c10d00
1 changed files with 6 additions and 2 deletions
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8
target-arm/op_helper.c
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@ -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)) {