[PATCH 1/2] arm/ptw: factor out wxn logic to separate functions

[Pavel Skripkin <paskripkin@gmail.com>]

The next patch will add support for WXN for short descriptor format. To
prevent code duplication, wxn logic was factored out to separate
functions.

Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 target/arm/ptw.c | 41 +++++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 9849949508..2a3933adec 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -1130,6 +1130,26 @@ do_fault:
     return true;
 }
 
+static bool arm_has_wxn(CPUARMState *env)
+{
+    /* TODO have_wxn should be replaced with
+     *   ARM_FEATURE_V8 || (ARM_FEATURE_V7 && ARM_FEATURE_EL2)
+     * when ARM_FEATURE_EL2 starts getting set. For now we assume all LPAE
+     * compatible processors have EL2, which is required for [U]WXN.
+     */
+    return arm_feature(env, ARM_FEATURE_LPAE);
+}
+
+static bool arm_wxn_enabled(CPUARMState *env, ARMMMUIdx mmu_idx)
+{
+    return arm_has_wxn(env) && (regime_sctlr(env, mmu_idx) & SCTLR_WXN);
+}
+
+static bool arm_uwxn_enabled(CPUARMState *env, ARMMMUIdx mmu_idx)
+{
+    return arm_has_wxn(env) && (regime_sctlr(env, mmu_idx) & SCTLR_UWXN);
+}
+
 static bool get_phys_addr_v6(CPUARMState *env, S1Translate *ptw,
                              uint32_t address, MMUAccessType access_type,
                              GetPhysAddrResult *result, ARMMMUFaultInfo *fi)
@@ -1370,8 +1390,7 @@ static int get_S1prot(CPUARMState *env, ARMMMUIdx mmu_idx, bool is_aa64,
     ARMCPU *cpu = env_archcpu(env);
     bool is_user = regime_is_user(env, mmu_idx);
     int prot_rw, user_rw;
-    bool have_wxn;
-    int wxn = 0;
+    int wxn = arm_wxn_enabled(env, mmu_idx);
 
     assert(!regime_is_stage2(mmu_idx));
 
@@ -1432,18 +1451,6 @@ static int get_S1prot(CPUARMState *env, ARMMMUIdx mmu_idx, bool is_aa64,
             g_assert_not_reached();
         }
     }
-
-    /* TODO have_wxn should be replaced with
-     *   ARM_FEATURE_V8 || (ARM_FEATURE_V7 && ARM_FEATURE_EL2)
-     * when ARM_FEATURE_EL2 starts getting set. For now we assume all LPAE
-     * compatible processors have EL2, which is required for [U]WXN.
-     */
-    have_wxn = arm_feature(env, ARM_FEATURE_LPAE);
-
-    if (have_wxn) {
-        wxn = regime_sctlr(env, mmu_idx) & SCTLR_WXN;
-    }
-
     if (is_aa64) {
         if (regime_has_2_ranges(mmu_idx) && !is_user) {
             xn = pxn || (user_rw & PAGE_WRITE);
@@ -1455,10 +1462,8 @@ static int get_S1prot(CPUARMState *env, ARMMMUIdx mmu_idx, bool is_aa64,
             if (is_user) {
                 xn = xn || !(user_rw & PAGE_READ);
             } else {
-                int uwxn = 0;
-                if (have_wxn) {
-                    uwxn = regime_sctlr(env, mmu_idx) & SCTLR_UWXN;
-                }
+                int uwxn = arm_uwxn_enabled(env, mmu_idx);
+
                 xn = xn || !(prot_rw & PAGE_READ) || pxn ||
                      (uwxn && (user_rw & PAGE_WRITE));
             }
-- 
2.46.0