[PATCH 17/35] target/arm: Always use arm_pan_enabled() when checking if PAN is enabled

[Peter Maydell]

Currently the code in target/arm/helper.c mostly checks the PAN bits
in env->pstate or env->uncached_cpsr directly when it wants to know
if PAN is enabled, because in most callsites we know whether we are
in AArch64 or AArch32. We do have an arm_pan_enabled() function, but
we only use it in a few places where the code might run in either an
AArch32 or AArch64 context.

For FEAT_NV, when HCR_EL2.{NV,NV1} is {1,1} PAN is always disabled
even when the PSTATE.PAN bit is set, the "is PAN enabled" test
becomes more complicated. Make all places that check for PAN use
arm_pan_enabled(), so we have a place to put the FEAT_NV test.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 3270fb11049..4b0e46cfaae 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -263,6 +263,15 @@ void init_cpreg_list(ARMCPU *cpu)
     g_list_free(keys);
 }
 
+static bool arm_pan_enabled(CPUARMState *env)
+{
+    if (is_a64(env)) {
+        return env->pstate & PSTATE_PAN;
+    } else {
+        return env->uncached_cpsr & CPSR_PAN;
+    }
+}
+
 /*
  * Some registers are not accessible from AArch32 EL3 if SCR.NS == 0.
  */
@@ -3598,7 +3607,7 @@ static void ats_write(CPUARMState *env, const 
ARMCPRegInfo *ri, uint64_t value)
             g_assert(ss != ARMSS_Secure);  /* ARMv8.4-SecEL2 is 64-bit only */
             /* fall through */
         case 1:
-            if (ri->crm == 9 && (env->uncached_cpsr & CPSR_PAN)) {
+            if (ri->crm == 9 && arm_pan_enabled(env)) {
                 mmu_idx = ARMMMUIdx_Stage1_E1_PAN;
             } else {
                 mmu_idx = ARMMMUIdx_Stage1_E1;
@@ -3714,7 +3723,7 @@ static void ats_write64(CPUARMState *env, const 
ARMCPRegInfo *ri,
     case 0:
         switch (ri->opc1) {
         case 0: /* AT S1E1R, AT S1E1W, AT S1E1RP, AT S1E1WP */
-            if (ri->crm == 9 && (env->pstate & PSTATE_PAN)) {
+            if (ri->crm == 9 && arm_pan_enabled(env)) {
                 mmu_idx = regime_e20 ?
                           ARMMMUIdx_E20_2_PAN : ARMMMUIdx_Stage1_E1_PAN;
             } else {
@@ -12222,15 +12231,6 @@ ARMMMUIdx arm_v7m_mmu_idx_for_secstate(CPUARMState 
*env, bool secstate)
 }
 #endif
 
-static bool arm_pan_enabled(CPUARMState *env)
-{
-    if (is_a64(env)) {
-        return env->pstate & PSTATE_PAN;
-    } else {
-        return env->uncached_cpsr & CPSR_PAN;
-    }
-}
-
 ARMMMUIdx arm_mmu_idx_el(CPUARMState *env, int el)
 {
     ARMMMUIdx idx;
-- 
2.34.1