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target/arm: Honour HCR_EL2.TGE and MDCR_EL2.TDE in debug register access checks

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Some debug registers can be trapped via MDCR_EL2 bits TDRA, TDOSA,
and TDA, which we implement in the functions access_tdra(),
access_tdosa() and access_tda(). If MDCR_EL2.TDE or HCR_EL2.TGE
are 1, the TDRA, TDOSA and TDA bits should behave as if they were 1.
Implement this by having the access functions check MDCR_EL2.TDE
and HCR_EL2.TGE.

Backports commit 30ac6339dca3fe0d05a611f12eedd5af20af585a from qemu
This commit is contained in:
Peter Maydell 2018-08-16 06:41:00 -04:00 committed by Lioncash
parent f0bf1160e4
commit 6b8d98bcd2
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 6 deletions
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18
qemu/target/arm/helper.c
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@ -318,9 +318,11 @@ 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) ||
(env->cp15.hcr_el2 & HCR_TGE);
if (el < 2 && (env->cp15.mdcr_el2 & MDCR_TDOSA)
&& !arm_is_secure_below_el3(env)) {
if (el < 2 && mdcr_el2_tdosa && !arm_is_secure_below_el3(env)) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDOSA)) {
@ -336,9 +338,11 @@ 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) ||
(env->cp15.hcr_el2 & HCR_TGE);
if (el < 2 && (env->cp15.mdcr_el2 & MDCR_TDRA)
&& !arm_is_secure_below_el3(env)) {
if (el < 2 && mdcr_el2_tdra && !arm_is_secure_below_el3(env)) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDA)) {
@ -354,9 +358,11 @@ 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) ||
(env->cp15.hcr_el2 & HCR_TGE);
if (el < 2 && (env->cp15.mdcr_el2 & MDCR_TDA)
&& !arm_is_secure_below_el3(env)) {
if (el < 2 && mdcr_el2_tda && !arm_is_secure_below_el3(env)) {
return CP_ACCESS_TRAP_EL2;
}
if (el < 3 && (env->cp15.mdcr_el3 & MDCR_TDA)) {