UserspaceEmulator: Add ways to check if a Region is stack/mmap

DevTools/UserspaceEmulator/Emulator.cpp

@@ -75,6 +75,7 @@ Emulator::Emulator(const Vector<String>& arguments, NonnullRefPtr<ELF::Loader> e
 void Emulator::setup_stack(const Vector<String>& arguments)
 {
     auto stack_region = make<SimpleRegion>(stack_location, stack_size);
+    stack_region->set_stack(true);
     m_mmu.add_region(move(stack_region));
     m_cpu.set_esp(stack_location + stack_size);
 

DevTools/UserspaceEmulator/MmapRegion.h

@@ -55,6 +55,7 @@ public:
 
 private:
     MmapRegion(u32 base, u32 size, int prot);
+    virtual bool is_mmap() const override { return true; }
 
     u8* m_data { nullptr };
     int m_prot { 0 };

DevTools/UserspaceEmulator/SoftMMU.h

@@ -58,6 +58,10 @@ public:
 
         virtual u8* cacheable_ptr([[maybe_unused]] u32 offset) { return nullptr; }
         virtual bool is_shared_buffer() const { return false; }
+        virtual bool is_mmap() const { return false; }
+
+        bool is_stack() const { return m_stack; }
+        void set_stack(bool b) { m_stack = b; }
 
     protected:
         Region(u32 base, u32 size)
@@ -69,6 +73,8 @@ public:
     private:
         u32 m_base { 0 };
         u32 m_size { 0 };
+
+        bool m_stack { false };
     };
 
     u8 read8(X86::LogicalAddress);