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target/arm: Implement UAO semantics

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We need only override the current condition under which
TBFLAG_A64.UNPRIV is set.

Backports commit 7a8014ab871d5320effd737dfe88b2e80f16a509 from qemu
This commit is contained in:
Richard Henderson 2020-03-21 17:50:27 -04:00 committed by Lioncash
parent 5b5050c6ca
commit 18a86780ee
1 changed files with 21 additions and 20 deletions
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41
qemu/target/arm/helper.c
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@ -11999,28 +11999,29 @@ void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
}
/* Compute the condition for using AccType_UNPRIV for LDTR et al. */
/* TODO: ARMv8.2-UAO */
switch (mmu_idx) {
case ARMMMUIdx_E10_1:
case ARMMMUIdx_E10_1_PAN:
case ARMMMUIdx_SE10_1:
case ARMMMUIdx_SE10_1_PAN:
/* TODO: ARMv8.3-NV */
flags = FIELD_DP32(flags, TBFLAG_A64, UNPRIV, 1);
break;
case ARMMMUIdx_E20_2:
case ARMMMUIdx_E20_2_PAN:
/* TODO: ARMv8.4-SecEL2 */
/*
* Note that E20_2 is gated by HCR_EL2.E2H == 1, but E20_0 is
* gated by HCR_EL2.<E2H,TGE> == '11', and so is LDTR.
*/
if (env->cp15.hcr_el2 & HCR_TGE) {
if (!(env->pstate & PSTATE_UAO)) {
switch (mmu_idx) {
case ARMMMUIdx_E10_1:
case ARMMMUIdx_E10_1_PAN:
case ARMMMUIdx_SE10_1:
case ARMMMUIdx_SE10_1_PAN:
/* TODO: ARMv8.3-NV */
flags = FIELD_DP32(flags, TBFLAG_A64, UNPRIV, 1);
break;
case ARMMMUIdx_E20_2:
case ARMMMUIdx_E20_2_PAN:
/* TODO: ARMv8.4-SecEL2 */
/*
* Note that EL20_2 is gated by HCR_EL2.E2H == 1, but EL20_0 is
* gated by HCR_EL2.<E2H,TGE> == '11', and so is LDTR.
*/
if (env->cp15.hcr_el2 & HCR_TGE) {
flags = FIELD_DP32(flags, TBFLAG_A64, UNPRIV, 1);
}
break;
default:
break;
}
break;
default:
break;
}
} else {
*pc = env->regs[15];