target/arm: Hoist read of *is_secure in S1_ptw_translate

Rename the argument to is_secure_ptr, and introduce a
local variable is_secure with the value.  We only write
back to the pointer toward the end of the function.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20221001162318.153420-15-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 12 insertions, 10 deletions

diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index b3e0db1..b40b458 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -207,24 +207,25 @@ static bool ptw_attrs_are_device(CPUARMState *env, ARMCacheAttrs cacheattrs)
 
 /* Translate a S1 pagetable walk through S2 if needed.  */
 static hwaddr S1_ptw_translate(CPUARMState *env, ARMMMUIdx mmu_idx,
-                               hwaddr addr, bool *is_secure,
+                               hwaddr addr, bool *is_secure_ptr,
                                ARMMMUFaultInfo *fi)
 {
-    ARMMMUIdx s2_mmu_idx = *is_secure ? ARMMMUIdx_Stage2_S : ARMMMUIdx_Stage2;
+    bool is_secure = *is_secure_ptr;
+    ARMMMUIdx s2_mmu_idx = is_secure ? ARMMMUIdx_Stage2_S : ARMMMUIdx_Stage2;
 
     if (arm_mmu_idx_is_stage1_of_2(mmu_idx) &&
-        !regime_translation_disabled(env, s2_mmu_idx, *is_secure)) {
+        !regime_translation_disabled(env, s2_mmu_idx, is_secure)) {
         GetPhysAddrResult s2 = {};
         int ret;
 
         ret = get_phys_addr_lpae(env, addr, MMU_DATA_LOAD, s2_mmu_idx,
-                                 *is_secure, false, &s2, fi);
+                                 is_secure, false, &s2, fi);
         if (ret) {
             assert(fi->type != ARMFault_None);
             fi->s2addr = addr;
             fi->stage2 = true;
             fi->s1ptw = true;
-            fi->s1ns = !*is_secure;
+            fi->s1ns = !is_secure;
             return ~0;
         }
         if ((arm_hcr_el2_eff(env) & HCR_PTW) &&
@@ -237,19 +238,20 @@ static hwaddr S1_ptw_translate(CPUARMState *env, ARMMMUIdx mmu_idx,
             fi->s2addr = addr;
             fi->stage2 = true;
             fi->s1ptw = true;
-            fi->s1ns = !*is_secure;
+            fi->s1ns = !is_secure;
             return ~0;
         }
 
         if (arm_is_secure_below_el3(env)) {
             /* Check if page table walk is to secure or non-secure PA space. */
-            if (*is_secure) {
-                *is_secure = !(env->cp15.vstcr_el2 & VSTCR_SW);
+            if (is_secure) {
+                is_secure = !(env->cp15.vstcr_el2 & VSTCR_SW);
             } else {
-                *is_secure = !(env->cp15.vtcr_el2 & VTCR_NSW);
+                is_secure = !(env->cp15.vtcr_el2 & VTCR_NSW);
             }
+            *is_secure_ptr = is_secure;
         } else {
-            assert(!*is_secure);
+            assert(!is_secure);
         }
 
         addr = s2.phys;