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target-arm: Implement remaining illegal return event checks

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We already implement almost all the checks for the illegal
return events from AArch64 state described in the ARM ARM section
D1.11.2. Add the two missing ones:
 * return to EL2 when EL3 is implemented and SCR_EL3.NS is 0
 * return to Non-secure EL1 when EL2 is implemented and HCR_EL2.TGE is 1

(We don't implement external debug, so the case of "debug state exit
from EL0 using AArch64 state to EL0 using AArch32 state" doesn't apply
for QEMU.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
This commit is contained in:
Peter Maydell 2016-01-21 14:15:09 +00:00
parent 3809951bf6
commit e393f339af
1 changed files with 10 additions and 0 deletions
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10
target-arm/op_helper.c
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@ -719,6 +719,16 @@ void HELPER(exception_return)(CPUARMState *env)
goto illegal_return;
}
if (new_el == 2 && arm_is_secure_below_el3(env)) {
/* Return to the non-existent secure-EL2 */
goto illegal_return;
}
if (new_el == 1 && (env->cp15.hcr_el2 & HCR_TGE)
&& !arm_is_secure_below_el3(env)) {
goto illegal_return;
}
if (!return_to_aa64) {
env->aarch64 = 0;
env->uncached_cpsr = spsr & CPSR_M;