Add actually_store tag to store_func and store_slow_path

Will be used to check store attributes without actually performing the store.

Needed to AMO bug fix.

riscv/mmu.cc

@@ -161,7 +161,7 @@ void mmu_t::load_slow_path(reg_t addr, reg_t len, uint8_t* bytes, uint32_t xlate
   }
 }
 
-void mmu_t::store_slow_path(reg_t addr, reg_t len, const uint8_t* bytes, uint32_t xlate_flags)
+void mmu_t::store_slow_path(reg_t addr, reg_t len, const uint8_t* bytes, uint32_t xlate_flags, bool actually_store)
 {
   reg_t paddr = translate(addr, len, STORE, xlate_flags);
 

riscv/mmu.h

@@ -147,7 +147,7 @@ public:
 
   // template for functions that store an aligned value to memory
   #define store_func(type, prefix, xlate_flags) \
-    void prefix##_##type(reg_t addr, type##_t val) { \
+    void prefix##_##type(reg_t addr, type##_t val, bool actually_store=true) {   \
       if (unlikely(addr & (sizeof(type##_t)-1))) \
         return misaligned_store(addr, val, sizeof(type##_t), xlate_flags); \
       reg_t vpn = addr >> PGSHIFT; \
@@ -167,7 +167,7 @@ public:
       } \
       else { \
         target_endian<type##_t> target_val = to_target(val); \
-        store_slow_path(addr, sizeof(type##_t), (const uint8_t*)&target_val, (xlate_flags)); \
+        store_slow_path(addr, sizeof(type##_t), (const uint8_t*)&target_val, (xlate_flags), actually_store); \
         if (proc) WRITE_MEM(addr, val, size); \
       } \
   }
@@ -438,7 +438,7 @@ private:
   // handle uncommon cases: TLB misses, page faults, MMIO
   tlb_entry_t fetch_slow_path(reg_t addr);
   void load_slow_path(reg_t addr, reg_t len, uint8_t* bytes, uint32_t xlate_flags);
-  void store_slow_path(reg_t addr, reg_t len, const uint8_t* bytes, uint32_t xlate_flags);
+  void store_slow_path(reg_t addr, reg_t len, const uint8_t* bytes, uint32_t xlate_flags, bool actually_store);
   bool mmio_load(reg_t addr, size_t len, uint8_t* bytes);
   bool mmio_store(reg_t addr, size_t len, const uint8_t* bytes);
   bool mmio_ok(reg_t addr, access_type type);