Added LDR

src/binary_translation/CMakeLists.txt

@@ -13,6 +13,7 @@ set(SRCS
 			Instructions/MovShift.cpp
 			Instructions/Branch.cpp
 			Instructions/Arithmetic.cpp
+			Instructions/Ldr.cpp
             )
 set(HEADERS
 			CodeGen.h
@@ -30,6 +31,7 @@ set(HEADERS
 			Instructions/MovShift.h
 			Instructions/Branch.h
 			Instructions/Arithmetic.h
+			Instructions/Ldr.h
             )
 			
 create_directory_groups(${SRCS} ${HEADERS})

src/binary_translation/InstructionBlock.h

@@ -49,8 +49,7 @@ public:
      * Creates a basic block for use by instructions
      */
     llvm::BasicBlock *CreateBasicBlock(const char *name);
-
-	/*
+    /*
 	 * Links two instructions, adding to prev and next lists
 	 */
 	static void Link(InstructionBlock *prev, InstructionBlock *next);

src/binary_translation/Instructions/Instruction.h

@@ -107,5 +107,5 @@ Instruction::FieldDefObject Instruction::FieldDef(Type* field)
 template <typename Type>
 void Instruction::WriteFunction(u32 value, void *field_address)
 {
-    *static_cast<Type *>(field_address) = static_cast<Type>(value);
+    *static_cast<Type *>(field_address) = Type(value);
 }

src/binary_translation/Instructions/Ldr.cpp

@@ -0,0 +1,107 @@
+#include "Ldr.h"
+#include "Disassembler.h"
+#include "InstructionBlock.h"
+#include <llvm/IR/Value.h>
+#include <core/loader/loader.h>
+#include <core/mem_map.h>
+#include "MachineState.h"
+
+static RegisterInstruction<Ldr> register_instruction;
+
+bool Ldr::Decode()
+{
+    if (ReadFields({ CondDef(), FieldDef<4>(5), FieldDef<1>(&U), FieldDef<7>(0x1f),
+                     FieldDef<4>(&rt), FieldDef<12>(&imm12)}))
+    {
+        form = Form::PC;
+        return true;
+    }
+    if (ReadFields({ CondDef(), FieldDef<3>(2), FieldDef<1>(&P), FieldDef<1>(&U), FieldDef<1>(0), FieldDef<1>(&W), FieldDef<1>(1), FieldDef<4>(&rn),
+                     FieldDef<4>(&rt), FieldDef<12>(&imm12) }))
+    {
+        form = Form::Reg;
+
+        if (!P && W) return false; // SEE LDRT;
+        if (rn == Register::SP && !P && U && !W && imm12 == 4) return false; // SEE POP;
+        if ((!P || W) && rn == rt) return false; // UNPREDICTABLE;
+
+        return true;
+    }
+    if (ReadFields({ CondDef(), FieldDef<6>(0x22), FieldDef<1>(&W), FieldDef<1>(1), FieldDef<4>(&rn),
+                     FieldDef<16>(&register_list) }))
+    {
+        form = Form::MultiReg;
+
+        if (W && rn == Register::SP && register_list.size() > 1) return false; // SEE POP (ARM);
+        if (rn == Register::PC || register_list.size() < 1) return false; // UNPREDICTABLE;
+        if (W && register_list[(u32)rn]) return false; // UNPREDICTABLE;
+
+        return true;
+    }
+    return false;
+}
+
+void Ldr::GenerateInstructionCode(InstructionBlock* instruction_block)
+{
+    auto ir_builder = instruction_block->IrBuilder();
+
+    if (form != Form::MultiReg)
+    {
+        llvm::Value *address = nullptr;
+        llvm::Value *value = nullptr;
+
+        auto add = (bool)U;
+
+        if (form == Form::PC)
+        {
+            auto base = instruction_block->Address() + 8;
+            auto constAddress = add ? base + imm12 : base - imm12;
+            auto constAddressEnd = constAddress + 4;
+            // If the value is read only, inline it
+            if (constAddress >= Loader::ROMCodeStart && constAddressEnd <= (Loader::ROMCodeStart + Loader::ROMCodeSize) ||
+                constAddress >= Loader::ROMReadOnlyDataStart && constAddressEnd <= (Loader::ROMReadOnlyDataStart + Loader::ROMReadOnlyDataSize))
+            {
+                value = ir_builder->getInt32(Memory::Read32(constAddress));
+            }
+            else
+            {
+                address = ir_builder->getInt32(constAddress);
+            }
+        }
+        else
+        {
+            auto index = (bool)P;
+            auto wback = !P || W;
+            auto source_register = instruction_block->Read(rn);
+            auto imm32 = ir_builder->getInt32(add ? imm12 : -imm12);
+
+            auto offset_address =  ir_builder->CreateAdd(source_register, imm32);
+            address = index ? offset_address : source_register;
+            if (wback)
+                instruction_block->Write(rn, offset_address);
+        }
+
+        if (!value) value = instruction_block->Module()->Machine()->ReadMemory32(address);
+        instruction_block->Write(rt, value);
+
+        if (rt == Register::PC)
+            instruction_block->Module()->BranchReadPC();
+    }
+    else
+    {
+        auto wback = (bool)W;
+        auto address = instruction_block->Read(rn);
+        for (auto i = 0; i < 16; ++i)
+        {
+            if (!register_list[i]) continue;
+            instruction_block->Write((Register)i, instruction_block->Module()->Machine()->ReadMemory32(address));
+            address = ir_builder->CreateAdd(address, ir_builder->getInt32(4));
+        }
+
+        if (wback)
+            instruction_block->Write(rn, address);
+
+        if (register_list[15])
+            instruction_block->Module()->BranchReadPC();
+    }
+}

src/binary_translation/Instructions/Ldr.h

@@ -0,0 +1,26 @@
+#include "Instruction.h"
+#include "Types.h"
+#include <bitset>
+
+class Ldr : public Instruction
+{
+public:
+    enum class Form
+    {
+        PC, Reg, MultiReg
+    };
+
+public:
+    virtual bool Decode() override;
+    void GenerateInstructionCode(InstructionBlock* instruction_block) override;
+
+private:
+    Form form;
+    bool U;
+    Register rt;
+    u32 imm12;
+    bool P;
+    bool W;
+    Register rn;
+    std::bitset<16> register_list;
+};

src/binary_translation/MachineState.cpp

@@ -23,6 +23,12 @@ void MachineState::GenerateGlobals()
     auto flags_global_initializer = ConstantPointerNull::get(IntegerType::getInt1PtrTy(getGlobalContext()));
     flags_global = new GlobalVariable(*module->Module(), flags_global_initializer->getType(),
         false, GlobalValue::ExternalLinkage, flags_global_initializer, "Flags");
+
+    auto memory_read_32_signature = FunctionType::get(IntegerType::getInt32Ty(getGlobalContext()), IntegerType::getInt32Ty(getGlobalContext()), false);
+    auto memory_read_32_ptr = PointerType::get(memory_read_32_signature, 0);
+    auto memory_read_32_initializer = ConstantPointerNull::get(memory_read_32_ptr);
+    memory_read_32_global = new GlobalVariable(*module->Module(), memory_read_32_ptr,
+        false, GlobalValue::ExternalLinkage, memory_read_32_initializer, "Memory::Read32");
 }
 
 Value *MachineState::GetRegisterPtr(Register reg)
@@ -87,4 +93,17 @@ Value* MachineState::ConditionPassed(Condition cond)
 
     if (not) pred = ir_builder->CreateNot(pred);
     return pred;
+}
+
+llvm::Value* MachineState::ReadMemory32(llvm::Value* address)
+{
+    auto ir_builder = module->IrBuilder();
+
+    auto memory_read_32 = ir_builder->CreateLoad(memory_read_32_global);
+    module->GetTBAA()->TagConst(memory_read_32);
+
+    auto call = ir_builder->CreateCall(memory_read_32, address);
+    call->setOnlyReadsMemory();
+    module->GetTBAA()->TagMemory(call);
+    return call;
 }

src/binary_translation/MachineState.h

@@ -23,6 +23,7 @@ public:
     llvm::Value *ReadRegiser(Register reg);
     llvm::Value *WriteRegiser(Register reg, llvm::Value *value);
     llvm::Value* ConditionPassed(Condition cond);
+    llvm::Value* ReadMemory32(llvm::Value* address);
 private:
     // Returns the address of a register or a flag
     llvm::Value *GetRegisterPtr(Register reg);
@@ -40,4 +41,10 @@ private:
     *  Orderered N, Z, C, V
     */
     llvm::GlobalVariable *flags_global;
+
+    /*
+    * u32 (u32) Memory::Read
+    *  Reads the memory at address
+    */
+    llvm::GlobalVariable *memory_read_32_global;
 };

src/binary_translation/TBAA.cpp

@@ -21,6 +21,7 @@ void TBAA::GenerateTags()
     }
     const_node = md_builder.createTBAAScalarTypeNode("Readonly", tbaa_root);
     instruction_count_node = md_builder.createTBAAScalarTypeNode("InstructionCount", tbaa_root);
+    memory_node = md_builder.createTBAAScalarTypeNode("Memory", tbaa_root);
 }
 
 void TBAA::TagRegister(Instruction* instruction, Register reg)
@@ -36,4 +37,9 @@ void TBAA::TagConst(Instruction* instruction)
 void TBAA::TagInstructionCount(llvm::Instruction* instruction)
 {
     instruction->setMetadata(LLVMContext::MD_tbaa, instruction_count_node);
+}
+
+void TBAA::TagMemory(llvm::Instruction* instruction)
+{
+    instruction->setMetadata(LLVMContext::MD_tbaa, memory_node);
 }

src/binary_translation/TBAA.h

@@ -1,5 +1,6 @@
 #pragma once
 #include "Instructions/Types.h"
+#include <llvm/IR/Instructions.h>
 
 namespace llvm
 {
@@ -22,10 +23,12 @@ public:
     void TagRegister(llvm::Instruction *instruction, Register reg);
     void TagConst(llvm::Instruction *instruction);
     void TagInstructionCount(llvm::Instruction *instruction);
+    void TagMemory(llvm::Instruction *instruction);
 private:
     llvm::MDNode *register_nodes[RegisterCount];
     // Tag for everything that is never written.
     // Since it is never written, one tag works
     llvm::MDNode *const_node;
     llvm::MDNode *instruction_count_node;
+    llvm::MDNode *memory_node;
 };

src/core/binary_translation/BinaryTranslationLoader.cpp

@@ -6,6 +6,7 @@
 #include <llvm/Object/ObjectFile.h>
 #include <llvm/ExecutionEngine/RuntimeDyld.h>
 #include <llvm/ExecutionEngine/SectionMemoryManager.h>
+#include <core/mem_map.h>
 
 using namespace llvm;
 
@@ -120,14 +121,16 @@ void BinaryTranslationLoader::Load(FileUtil::IOFile& file)
     g_can_run_function = static_cast<decltype(g_can_run_function)>(g_dyld->getSymbolAddress("CanRun"));
     auto verify_ptr = static_cast<bool*>(g_dyld->getSymbolAddress("Verify"));
     g_instruction_count = static_cast<uint32_t *>(g_dyld->getSymbolAddress("InstructionCount"));
+    auto memory_read_32_ptr = static_cast<decltype(&Memory::Read32) *>(g_dyld->getSymbolAddress("Memory::Read32"));
 
-    if (!g_run_function || !g_can_run_function || !verify_ptr || !g_instruction_count)
+    if (!g_run_function || !g_can_run_function || !verify_ptr || !g_instruction_count || !memory_read_32_ptr)
     {
         LOG_WARNING(Loader, "Cannot load optimized file, missing critical function");
         return;
     }
 
     g_verify = *verify_ptr;
+    *memory_read_32_ptr = &Memory::Read32;
 
     g_enabled = true;