arch-arm: Fix WalkerState,Descriptors default constructor

Those POD strutures are not initializing all members at construction.
This could lead to undefined behaviour

Change-Id: Iaa8afb126382b6bfbef686883a026262f24d5ca1
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-by: Javier Setoain <javier.setoain@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/19149
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/arm/table_walker.cc

@@ -130,7 +130,10 @@ TableWalker::getPort(const std::string &if_name, PortID idx)
 TableWalker::WalkerState::WalkerState() :
     tc(nullptr), aarch64(false), el(EL0), physAddrRange(0), req(nullptr),
     asid(0), vmid(0), isHyp(false), transState(nullptr),
-    vaddr(0), vaddr_tainted(0), isWrite(false), isFetch(false), isSecure(false),
+    vaddr(0), vaddr_tainted(0),
+    sctlr(0), scr(0), cpsr(0), tcr(0),
+    htcr(0), hcr(0), vtcr(0),
+    isWrite(false), isFetch(false), isSecure(false),
     secureLookup(false), rwTable(false), userTable(false), xnTable(false),
     pxnTable(false), stage2Req(false),
     stage2Tran(nullptr), timing(false), functional(false),

src/arch/arm/table_walker.hh

@@ -67,6 +67,8 @@ class TableWalker : public ClockedObject
 
     class DescriptorBase {
       public:
+        DescriptorBase() : lookupLevel(L0) {}
+
         /** Current lookup level for this descriptor */
         LookupLevel lookupLevel;
 
@@ -382,6 +384,8 @@ class TableWalker : public ClockedObject
             Page
         };
 
+        LongDescriptor() : data(0), _dirty(false) {}
+
         /** The raw bits of the entry */
         uint64_t data;