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target/arm: Ignore HCR_EL2.ATA when {E2H,TGE} != 11

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Unlike many other bits in HCR_EL2, the description for this
bit does not contain the phrase "if ... this field behaves
as 0 for all purposes other than", so do not squash the bit
in arm_hcr_el2_eff.

Instead, replicate the E2H+TGE test in the two places that
require it.

Backports 4301acd7d7d455792ea873ced75c0b5d653618b1
This commit is contained in:
Richard Henderson 2021-03-01 20:12:34 -05:00 committed by Lioncash
parent 4f00eacb11
commit f7e831a7e4
2 changed files with 10 additions and 8 deletions
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7
qemu/target/arm/helper.c
View file

@ -6575,11 +6575,12 @@ static CPAccessResult access_mte(CPUARMState *env, const ARMCPRegInfo *ri,
{
int el = arm_current_el(env);
if (el < 2 &&
arm_feature(env, ARM_FEATURE_EL2) &&
!(arm_hcr_el2_eff(env) & HCR_ATA)) {
if (el < 2 && arm_feature(env, ARM_FEATURE_EL2)) {
uint64_t hcr = arm_hcr_el2_eff(env);
if (!(hcr & HCR_ATA) && (!(hcr & HCR_E2H) || !(hcr & HCR_TGE))) {
return CP_ACCESS_TRAP_EL2;
}
}
if (el < 3 &&
arm_feature(env, ARM_FEATURE_EL3) &&
!(env->cp15.scr_el3 & SCR_ATA)) {

7
qemu/target/arm/internals.h
View file

@ -1254,11 +1254,12 @@ static inline bool allocation_tag_access_enabled(CPUARMState *env, int el,
&& !(env->cp15.scr_el3 & SCR_ATA)) {
return false;
}
if (el < 2
&& arm_feature(env, ARM_FEATURE_EL2)
&& !(arm_hcr_el2_eff(env) & HCR_ATA)) {
if (el < 2 && arm_feature(env, ARM_FEATURE_EL2)) {
uint64_t hcr = arm_hcr_el2_eff(env);
if (!(hcr & HCR_ATA) && (!(hcr & HCR_E2H) || !(hcr & HCR_TGE))) {
return false;
}
}
sctlr &= (el == 0 ? SCTLR_ATA0 : SCTLR_ATA);
return sctlr != 0;
}