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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.)

Backports commit e393f339af87da7210f6c86902b321df6a2e8bf5 from qemu
This commit is contained in:
Peter Maydell 2018-02-18 22:47:21 -05:00 committed by Lioncash
parent 2ffb545ec3
commit 9826fc4414
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 10 additions and 0 deletions
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10
qemu/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;