Added Thumb rejection. Can run retail games now.

src/binary_translation/ModuleGen.cpp

@@ -152,7 +152,7 @@ void ModuleGen::GenerateGetBlockAddressFunction()
     /*
     entry_basic_block:
         auto index = (pc - block_address_array_base) / 4;
-        if(index < block_address_array_size)
+        if(((pc & 3) == 0) && index < block_address_array_size)
         {
     index_in_bounds_basic_block:
             return block_address_array[index];
@@ -169,10 +169,12 @@ void ModuleGen::GenerateGetBlockAddressFunction()
     auto index_out_of_bounds_basic_block = BasicBlock::Create(getGlobalContext(), "IndexOutOfBounds", get_block_address_function);
 
     ir_builder->SetInsertPoint(entry_basic_block);
-    auto index = ir_builder->CreateUDiv(pc, ir_builder->getInt32(4));
+    auto index = ir_builder->CreateUDiv(pc, ir_builder->getInt32(4), "", true);
     index = ir_builder->CreateSub(index, ir_builder->getInt32(block_address_array_base));
     auto in_bounds_pred = ir_builder->CreateICmpULT(index, ir_builder->getInt32(block_address_array_size));
-    ir_builder->CreateCondBr(in_bounds_pred, index_in_bounds_basic_block, index_out_of_bounds_basic_block);
+    auto arm_pred = ir_builder->CreateICmpEQ(ir_builder->CreateAnd(pc, 3), ir_builder->getInt32(0));
+    auto pred = ir_builder->CreateAnd(in_bounds_pred, arm_pred);
+    ir_builder->CreateCondBr(pred, index_in_bounds_basic_block, index_out_of_bounds_basic_block);
 
     ir_builder->SetInsertPoint(index_in_bounds_basic_block);
     Value *gep_values[] = { ir_builder->getInt32(0), index };

src/core/binary_translation/BinaryTranslationLoader.cpp

@@ -11,21 +11,66 @@ using namespace llvm;
 
 bool g_enabled = false;
 bool g_verify = false;
+ARMul_State *g_state;
 
 std::unique_ptr<SectionMemoryManager> g_memory_manager;
 std::unique_ptr<RuntimeDyld> g_dyld;
 std::unique_ptr<RuntimeDyld::LoadedObjectInfo> g_loaded_object_info;
 
 void(*g_run_function)();
+bool(*g_can_run_function)();
 
 // Used by the verifier
-bool (*g_can_run_function)();
+struct SavedState
+{
+    SavedState() { }
+    SavedState(const ARMul_State &state)
+    {
+        memcpy(regs, state.Reg, sizeof(regs));
+        memcpy(flags, &state.NFlag, sizeof(flags));
+        t_flag = state.TFlag;
+    }
+    void CopyTo(ARMul_State &state)
+    {
+        memcpy(state.Reg, regs, sizeof(regs));
+        memcpy(&state.NFlag, flags, sizeof(flags));
+        t_flag = state.TFlag;
+    }
+    void SwapWith(ARMul_State &state)
+    {
+        SavedState arm_state = state;
+        std::swap(*this, arm_state);
+        arm_state.CopyTo(state);
+    }
+    void Print()
+    {
+        LOG_ERROR(BinaryTranslator, "%08x %08x %08x %08x %08x %08x %08x %08x",
+            regs[0], regs[1], regs[2], regs[3],
+            regs[4], regs[5], regs[6], regs[7]);
+        LOG_ERROR(BinaryTranslator, "%08x %08x %08x %08x %08x %08x %08x %08x",
+            regs[8], regs[9], regs[10], regs[11],
+            regs[12], regs[13], regs[14], regs[15]);
+        LOG_ERROR(BinaryTranslator, "%01x %01x %01x %01x %01x", flags[0], flags[1], flags[2], flags[3], t_flag);
+    }
+
+    u32 regs[16];
+    u32 flags[4];
+    u32 t_flag;
+};
+
+bool operator==(const SavedState& lhs, const SavedState& rhs)
+{
+    return memcmp(&lhs, &rhs, sizeof(lhs)) == 0;
+}
+
+bool operator!=(const SavedState& lhs, const SavedState& rhs)
+{
+    return memcmp(&lhs, &rhs, sizeof(lhs)) != 0;
+}
+
 bool g_have_saved_state; // Whether there is a copied state
-ARMul_State *g_state;
+SavedState g_state_copy;
-u32 g_regs_copy[16];
+SavedState g_state_copy_before;
-u32 g_flags_copy[4];
-u32 g_regs_copy_before[16];
-u32 g_flags_copy_before[4];
 
 void BinaryTranslationLoader::Load(FileUtil::IOFile& file)
 {
@@ -90,12 +135,35 @@ void BinaryTranslationLoader::SetCpuState(ARMul_State* state)
     g_state = state;
 }
 
+bool BinaryTranslationLoader::CanRun(bool specific_address)
+{
+    if (!g_enabled) return false;
+    // Thumb not implemented
+    if (g_state->TFlag) return false;
+    if (specific_address)
+        if (!g_can_run_function()) return false;
+    return true;
+}
+
 void BinaryTranslationLoader::Run()
 {
+    // No need to check the PC, Run does it anyway
+    if (!CanRun(false)) return;
     // If verify is enabled, it will run opcodes
-    if (!g_enabled || g_verify) return;
+    if (g_verify) return;
 
+    RunInternal();
+}
+
+void BinaryTranslationLoader::RunInternal()
+{
     g_run_function();
+
+    g_state->TFlag = g_state->Reg[15] & 1;
+    if (g_state->TFlag)
+        g_state->Reg[15] &= 0xfffffffe;
+    else
+        g_state->Reg[15] &= 0xfffffffc;
 }
 
 void Swap(void *a, void *b, size_t size)
@@ -108,65 +176,53 @@ void Swap(void *a, void *b, size_t size)
     }
 }
 
-void ShowRegs(u32 *regs, u32 *flags)
-{
-    LOG_ERROR(BinaryTranslator, "%08x %08x %08x %08x %08x %08x %08x %08x",
-        regs[0], regs[1], regs[2], regs[3],
-        regs[4], regs[5], regs[6], regs[7]);
-    LOG_ERROR(BinaryTranslator, "%08x %08x %08x %08x %08x %08x %08x %08x",
-        regs[8], regs[9], regs[10], regs[11],
-        regs[12], regs[13], regs[14], regs[15]);
-    LOG_ERROR(BinaryTranslator, "%01x %01x %01x %01x", flags[0], flags[1], flags[2], flags[3]);
-}
-
 void BinaryTranslationLoader::VerifyCallback()
 {
     if (!g_enabled || !g_verify) return;
 
-    // Swap the PC to the old state before checking if it can run
+    // Swap the PC and TFlag to the old state before checking if it can run
-    std::swap(g_regs_copy[15], g_state->Reg[15]);
+    std::swap(g_state_copy.regs[15], g_state->Reg[15]);
-    auto can_run = g_can_run_function();
+    std::swap(g_state_copy.t_flag, g_state->TFlag);
-    std::swap(g_regs_copy[15], g_state->Reg[15]);
+    auto can_run = CanRun(true);
+    std::swap(g_state_copy.regs[15], g_state->Reg[15]);
+    std::swap(g_state_copy.t_flag, g_state->TFlag);
 
     if (g_have_saved_state && can_run)
     {
         // An opcode is finished, simulate it
 
         // Copy the state before
-        memcpy(g_regs_copy_before, g_regs_copy, sizeof(g_regs_copy));
+        g_state_copy_before = g_state_copy;
-        memcpy(g_flags_copy_before, &g_flags_copy, sizeof(g_flags_copy));
 
         // Swap to the state before the opcode
-        Swap(g_state->Reg, g_regs_copy, sizeof(g_regs_copy));
+        g_state_copy.SwapWith(*g_state);
-        Swap(&g_state->NFlag, g_flags_copy, sizeof(g_flags_copy));
 
         // Run the opcode
-        g_run_function();
+        RunInternal();
 
         // Test
-        if (memcmp(g_state->Reg, g_regs_copy, sizeof(g_regs_copy)) || memcmp(&g_state->NFlag, g_flags_copy, sizeof(g_flags_copy)))
+        auto current_as_saved_state = SavedState(*g_state);
+        if (current_as_saved_state != g_state_copy)
         {
             LOG_ERROR(BinaryTranslator, "Verify failed");
             LOG_ERROR(BinaryTranslator, "Regs Before");
-            ShowRegs(g_regs_copy_before, g_flags_copy_before);
+            g_state_copy_before.Print();
             LOG_ERROR(BinaryTranslator, "Regs OK");
-            ShowRegs(g_regs_copy, g_flags_copy);
+            g_state_copy.Print();
             LOG_ERROR(BinaryTranslator, "Regs not OK");
-            ShowRegs(g_state->Reg, &g_state->NFlag);
+            current_as_saved_state.Print();
 
             // Don't spam
             g_enabled = false;
 
             // Make sure it has a valid state to continue to run
-            Swap(g_state->Reg, g_regs_copy, sizeof(g_regs_copy));
+            g_state_copy.CopyTo(*g_state);
-            Swap(&g_state->NFlag, g_flags_copy, sizeof(g_flags_copy));
         }
     }
     else
     {
         // If this opcode is not translated or there is no saved state, just save the state and continue
-        memcpy(g_regs_copy, g_state->Reg, sizeof(g_regs_copy));
+        g_state_copy = *g_state;
-        memcpy(g_flags_copy, &g_state->NFlag, sizeof(g_flags_copy));
 
         g_have_saved_state = true;
     }

src/core/binary_translation/BinaryTranslationLoader.h

@@ -9,7 +9,12 @@ class BinaryTranslationLoader
 public:
     static void Load(FileUtil::IOFile& file);
     static void SetCpuState(ARMul_State *state);
+    // Checks whether the cpu state can be run
+    // If specific_address, checks the specific PC too
+    static bool CanRun(bool specific_address);
     // Runs the state provided at SetCpuState.
     static void Run();
+    // Link between Run and VerifyCallback
+    static void RunInternal();
     static void VerifyCallback();
 };