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target/arm: factor MDCR_EL2 common handling

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This adds a common helper to compute the effective value of MDCR_EL2.
That is the actual value if EL2 is enabled in the current security
context, or 0 elsewise.

Backports 59dd089cf9e4a9cddee596c8a1378620df51b9bb
This commit is contained in:
Rémi Denis-Courmont 2021-03-04 13:57:33 -05:00 committed by Lioncash
parent b657bfc59b
commit b42e6d6036
1 changed files with 16 additions and 11 deletions
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27
qemu/target/arm/helper.c
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@ -278,6 +278,11 @@ static CPAccessResult access_trap_aa32s_el1(CPUARMState *env,
return CP_ACCESS_TRAP_UNCATEGORIZED;
}
static uint64_t arm_mdcr_el2_eff(CPUARMState *env)
{
return arm_is_el2_enabled(env) ? env->cp15.mdcr_el2 : 0;
}
/* Check for traps to "powerdown debug" registers, which are controlled
* by MDCR.TDOSA
*/
@ -285,11 +290,11 @@ static CPAccessResult access_tdosa(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
int el = arm_current_el(env);
bool mdcr_el2_tdosa = (env->cp15.mdcr_el2 & MDCR_TDOSA) ||
(env->cp15.mdcr_el2 & MDCR_TDE) ||
uint64_t mdcr_el2 = arm_mdcr_el2_eff(env);
bool mdcr_el2_tdosa = (mdcr_el2 & MDCR_TDOSA) || (mdcr_el2 & MDCR_TDE) ||
(arm_hcr_el2_eff(env) & HCR_TGE);
if (el < 2 && mdcr_el2_tdosa && !arm_is_secure_below_el3(env)) {
if (el < 2 && mdcr_el2_tdosa) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDOSA)) {
@ -305,11 +310,11 @@ static CPAccessResult access_tdra(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
int el = arm_current_el(env);
bool mdcr_el2_tdra = (env->cp15.mdcr_el2 & MDCR_TDRA) ||
(env->cp15.mdcr_el2 & MDCR_TDE) ||
uint64_t mdcr_el2 = arm_mdcr_el2_eff(env);
bool mdcr_el2_tdra = (mdcr_el2 & MDCR_TDRA) || (mdcr_el2 & MDCR_TDE) ||
(arm_hcr_el2_eff(env) & HCR_TGE);
if (el < 2 && mdcr_el2_tdra && !arm_is_secure_below_el3(env)) {
if (el < 2 && mdcr_el2_tdra) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDA)) {
@ -325,11 +330,11 @@ static CPAccessResult access_tda(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
int el = arm_current_el(env);
bool mdcr_el2_tda = (env->cp15.mdcr_el2 & MDCR_TDA) ||
(env->cp15.mdcr_el2 & MDCR_TDE) ||
uint64_t mdcr_el2 = arm_mdcr_el2_eff(env);
bool mdcr_el2_tda = (mdcr_el2 & MDCR_TDA) || (mdcr_el2 & MDCR_TDE) ||
(arm_hcr_el2_eff(env) & HCR_TGE);
if (el < 2 && mdcr_el2_tda && !arm_is_secure_below_el3(env)) {
if (el < 2 && mdcr_el2_tda) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDA)) {
@ -345,9 +350,9 @@ static CPAccessResult access_tpm(CPUARMState *env, const ARMCPRegInfo *ri,
bool isread)
{
int el = arm_current_el(env);
uint64_t mdcr_el2 = arm_mdcr_el2_eff(env);
if (el < 2 && (env->cp15.mdcr_el2 & MDCR_TPM)
&& !arm_is_secure_below_el3(env)) {
if (el < 2 && (mdcr_el2 & MDCR_TPM)) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TPM)) {