diff --git a/.gitmodules b/.gitmodules
index 65213c155..c2d9714c4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "third_party/binutils"]
 	path = third_party/binutils
 	url = http://sourceware.org/git/binutils.git
+[submodule "third_party/sparsehash"]
+	path = third_party/sparsehash
+	url = https://github.com/benvanik/sparsehash.git
diff --git a/include/xenia/cpu/codegen/module_generator.h b/include/xenia/cpu/codegen/module_generator.h
index 2ed8af158..beea1e266 100644
--- a/include/xenia/cpu/codegen/module_generator.h
+++ b/include/xenia/cpu/codegen/module_generator.h
@@ -10,6 +10,11 @@
 #ifndef XENIA_CPU_CODEGEN_MODULE_GENERATOR_H_
 #define XENIA_CPU_CODEGEN_MODULE_GENERATOR_H_
 
+#include <xenia/common.h>
+#include <xenia/core.h>
+
+#include <tr1/unordered_map>
+
 #include <xenia/cpu/sdb.h>
 #include <xenia/core/memory.h>
 #include <xenia/kernel/export.h>
@@ -17,11 +22,11 @@
 
 
 namespace llvm {
+  class DIBuilder;
+  class Function;
+  class FunctionType;
   class LLVMContext;
   class Module;
-  class FunctionType;
-  class Function;
-  class DIBuilder;
   class MDNode;
 }
 
@@ -42,6 +47,9 @@ public:
 
   int Generate();
 
+  void AddFunctionsToMap(
+      std::tr1::unordered_map<uint32_t, llvm::Function*>& map);
+
 private:
   class CodegenFunction {
   public:
diff --git a/include/xenia/cpu/exec_module.h b/include/xenia/cpu/exec_module.h
index 955279f80..752665f1a 100644
--- a/include/xenia/cpu/exec_module.h
+++ b/include/xenia/cpu/exec_module.h
@@ -13,15 +13,18 @@
 #include <xenia/common.h>
 #include <xenia/core.h>
 
+#include <tr1/unordered_map>
+
 #include <xenia/cpu/sdb.h>
 #include <xenia/kernel/export.h>
 #include <xenia/kernel/user_module.h>
 
 
 namespace llvm {
+  class ExecutionEngine;
+  class Function;
   class LLVMContext;
   class Module;
-  class ExecutionEngine;
 }
 
 namespace xe {
@@ -37,6 +40,9 @@ namespace xe {
 namespace cpu {
 
 
+typedef std::tr1::unordered_map<uint32_t, llvm::Function*> FunctionMap;
+
+
 class ExecModule {
 public:
   ExecModule(
@@ -48,6 +54,8 @@ public:
   int PrepareUserModule(kernel::UserModule* user_module);
   int PrepareRawBinary(uint32_t start_address, uint32_t end_address);
 
+  void AddFunctionsToMap(FunctionMap& map);
+
   void Dump();
 
 private:
@@ -65,6 +73,8 @@ private:
   shared_ptr<llvm::LLVMContext>       context_;
   shared_ptr<llvm::Module>            gen_module_;
   auto_ptr<codegen::ModuleGenerator>  codegen_;
+
+  FunctionMap fns_;
 };
 
 
diff --git a/include/xenia/cpu/ppc/state.h b/include/xenia/cpu/ppc/state.h
index a559fdfe9..5262e2a9b 100644
--- a/include/xenia/cpu/ppc/state.h
+++ b/include/xenia/cpu/ppc/state.h
@@ -143,7 +143,13 @@ typedef struct XECACHEALIGN64 xe_ppc_state {
 
   // Runtime-specific data pointer. Used on callbacks to get access to the
   // current runtime and its data.
-  void* runtime_data;
+  void* processor;
+  void* thread_state;
+  void* runtime;
+
+  void SetRegFromString(const char* name, const char* value);
+  bool CompareRegWithString(const char* name, const char* value,
+                            char* out_value, size_t out_value_size);
 } xe_ppc_state_t;
 
 
diff --git a/include/xenia/cpu/processor.h b/include/xenia/cpu/processor.h
index 312bc7229..d4c78757a 100644
--- a/include/xenia/cpu/processor.h
+++ b/include/xenia/cpu/processor.h
@@ -12,15 +12,18 @@
 
 #include <xenia/core.h>
 
+#include <tr1/unordered_map>
 #include <vector>
 
 #include <xenia/cpu/exec_module.h>
+#include <xenia/cpu/thread_state.h>
 #include <xenia/kernel/export.h>
 #include <xenia/kernel/user_module.h>
 
 
 namespace llvm {
   class ExecutionEngine;
+  class Function;
 }
 
 
@@ -44,10 +47,15 @@ public:
   int PrepareModule(kernel::UserModule* user_module,
                     shared_ptr<kernel::ExportResolver> export_resolver);
 
-  int Execute(uint32_t address);
   uint32_t CreateCallback(void (*callback)(void* data), void* data);
 
+  ThreadState* AllocThread(uint32_t stack_address, uint32_t stack_size);
+  void DeallocThread(ThreadState* thread_state);
+  int Execute(ThreadState* thread_state, uint32_t address);
+
 private:
+  llvm::Function* GetFunction(uint32_t address);
+
   xe_pal_ref              pal_;
   xe_memory_ref           memory_;
   shared_ptr<llvm::ExecutionEngine> engine_;
@@ -55,6 +63,8 @@ private:
   auto_ptr<llvm::LLVMContext> dummy_context_;
 
   std::vector<ExecModule*> modules_;
+
+  FunctionMap all_fns_;
 };
 
 
diff --git a/include/xenia/cpu/sdb.h b/include/xenia/cpu/sdb.h
index b302a806b..fe9e70ec2 100644
--- a/include/xenia/cpu/sdb.h
+++ b/include/xenia/cpu/sdb.h
@@ -77,7 +77,7 @@ public:
   uint32_t      start_address;
   uint32_t      end_address;
 
-  vector<FunctionBlock*> incoming_blocks;
+  std::vector<FunctionBlock*> incoming_blocks;
 
   TargetType        outgoing_type;
   uint32_t          outgoing_address;
@@ -114,11 +114,11 @@ public:
   kernel::KernelExport* kernel_export;
   ExceptionEntrySymbol* ee;
 
-  vector<FunctionCall*> incoming_calls;
-  vector<FunctionCall*> outgoing_calls;
-  vector<VariableAccess*> variable_accesses;
+  std::vector<FunctionCall*> incoming_calls;
+  std::vector<FunctionCall*> outgoing_calls;
+  std::vector<VariableAccess*> variable_accesses;
 
-  map<uint32_t, FunctionBlock*> blocks;
+  std::map<uint32_t, FunctionBlock*> blocks;
 };
 
 class VariableSymbol : public Symbol {
@@ -154,7 +154,7 @@ public:
   VariableSymbol* GetVariable(uint32_t address);
   Symbol* GetSymbol(uint32_t address);
 
-  int GetAllFunctions(vector<FunctionSymbol*>& functions);
+  int GetAllFunctions(std::vector<FunctionSymbol*>& functions);
 
   void Write(const char* file_name);
   void Dump();
diff --git a/include/xenia/cpu/thread_state.h b/include/xenia/cpu/thread_state.h
new file mode 100644
index 000000000..efe71befe
--- /dev/null
+++ b/include/xenia/cpu/thread_state.h
@@ -0,0 +1,45 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_CPU_THREAD_STATE_H_
+#define XENIA_CPU_THREAD_STATE_H_
+
+#include <xenia/core.h>
+
+#include <xenia/cpu/ppc.h>
+
+
+namespace xe {
+namespace cpu {
+
+
+class Processor;
+
+
+class ThreadState {
+public:
+  ThreadState(Processor* processor,
+              uint32_t stack_address, uint32_t stack_size);
+  ~ThreadState();
+
+  xe_ppc_state_t* ppc_state();
+
+private:
+  uint32_t stack_address_;
+  uint32_t stack_size_;
+
+  xe_ppc_state_t  ppc_state_;
+};
+
+
+}  // namespace cpu
+}  // namespace xe
+
+
+#endif  // XENIA_CPU_THREAD_STATE_H_
diff --git a/include/xenia/types.h b/include/xenia/types.h
index b6f7b463c..e2cb4c46e 100644
--- a/include/xenia/types.h
+++ b/include/xenia/types.h
@@ -13,12 +13,11 @@
 #include <xenia/platform.h>
 #include <xenia/platform_includes.h>
 
-
 #include <tr1/memory>
 namespace xe {
 // TODO(benvanik): support other compilers/etc
-using namespace std;
-using namespace std::tr1;
+using std::auto_ptr;
+using std::tr1::shared_ptr;
 }  // namespace xe
 
 
diff --git a/src/cpu/codegen/function_generator.cc b/src/cpu/codegen/function_generator.cc
index 4863c3a26..498a40e7c 100644
--- a/src/cpu/codegen/function_generator.cc
+++ b/src/cpu/codegen/function_generator.cc
@@ -413,8 +413,8 @@ Value* FunctionGenerator::LoadStateValue(uint32_t offset, Type* type,
   IRBuilder<>& b = *builder_;
   PointerType* pointerTy = PointerType::getUnqual(type);
   Function::arg_iterator args = gen_fn_->arg_begin();
-  Value* statePtr = args;
-  Value* address = b.CreateConstInBoundsGEP1_64(statePtr, offset);
+  Value* state_ptr = args;
+  Value* address = b.CreateInBoundsGEP(state_ptr, b.getInt32(offset));
   Value* ptr = b.CreatePointerCast(address, pointerTy);
   return b.CreateLoad(ptr, name);
 }
@@ -424,8 +424,8 @@ void FunctionGenerator::StoreStateValue(uint32_t offset, Type* type,
   IRBuilder<>& b = *builder_;
   PointerType* pointerTy = PointerType::getUnqual(type);
   Function::arg_iterator args = gen_fn_->arg_begin();
-  Value* statePtr = args;
-  Value* address = b.CreateConstInBoundsGEP1_64(statePtr, offset);
+  Value* state_ptr = args;
+  Value* address = b.CreateInBoundsGEP(state_ptr, b.getInt32(offset));
   Value* ptr = b.CreatePointerCast(address, pointerTy);
   b.CreateStore(value, ptr);
 }
@@ -861,7 +861,8 @@ Value* FunctionGenerator::ReadMemory(Value* addr, uint32_t size, bool extend) {
   }
   PointerType* pointerTy = PointerType::getUnqual(dataTy);
 
-  Value* address = b.CreateInBoundsGEP(GetMembase(), addr);
+  Value* offset_addr = b.CreateAdd(addr, b.getInt64(size));
+  Value* address = b.CreateInBoundsGEP(GetMembase(), offset_addr);
   Value* ptr = b.CreatePointerCast(address, pointerTy);
   return b.CreateLoad(ptr);
 }
@@ -889,7 +890,8 @@ void FunctionGenerator::WriteMemory(Value* addr, uint32_t size, Value* value) {
   }
   PointerType* pointerTy = PointerType::getUnqual(dataTy);
 
-  Value* address = b.CreateInBoundsGEP(GetMembase(), addr);
+  Value* offset_addr = b.CreateAdd(addr, b.getInt64(size));
+  Value* address = b.CreateInBoundsGEP(GetMembase(), offset_addr);
   Value* ptr = b.CreatePointerCast(address, pointerTy);
 
   // Truncate, if required.
diff --git a/src/cpu/codegen/module_generator.cc b/src/cpu/codegen/module_generator.cc
index bce0fdaf4..78bfed1e4 100644
--- a/src/cpu/codegen/module_generator.cc
+++ b/src/cpu/codegen/module_generator.cc
@@ -126,6 +126,14 @@ int ModuleGenerator::Generate() {
   return 0;
 }
 
+void ModuleGenerator::AddFunctionsToMap(
+    std::tr1::unordered_map<uint32_t, llvm::Function*>& map) {
+  for (std::map<uint32_t, CodegenFunction*>::iterator it = functions_.begin();
+       it != functions_.end(); ++it) {
+    map.insert(std::pair<uint32_t, Function*>(it->first, it->second->function));
+  }
+}
+
 ModuleGenerator::CodegenFunction* ModuleGenerator::GetCodegenFunction(
     uint32_t address) {
   std::map<uint32_t, CodegenFunction*>::iterator it = functions_.find(address);
diff --git a/src/cpu/exec_module.cc b/src/cpu/exec_module.cc
index 74bacc35b..a98d9f435 100644
--- a/src/cpu/exec_module.cc
+++ b/src/cpu/exec_module.cc
@@ -219,6 +219,10 @@ XECLEANUP:
   return result_code;
 }
 
+void ExecModule::AddFunctionsToMap(FunctionMap& map) {
+  codegen_->AddFunctionsToMap(map);
+}
+
 void XeTrap(xe_ppc_state_t* state, uint32_t cia) {
   printf("TRAP");
   XEASSERTALWAYS();
diff --git a/src/cpu/ppc/sources.gypi b/src/cpu/ppc/sources.gypi
index 4acb10332..86abd4a97 100644
--- a/src/cpu/ppc/sources.gypi
+++ b/src/cpu/ppc/sources.gypi
@@ -2,5 +2,6 @@
 {
   'sources': [
     'instr.cc',
+    'state.cc',
   ],
 }
diff --git a/src/cpu/ppc/state.cc b/src/cpu/ppc/state.cc
new file mode 100644
index 000000000..9d4779644
--- /dev/null
+++ b/src/cpu/ppc/state.cc
@@ -0,0 +1,47 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <xenia/common.h>
+#include <xenia/core.h>
+#include <xenia/cpu/ppc/state.h>
+
+
+namespace {
+
+uint64_t ParseInt64(const char* value) {
+  return strtoull(value, NULL, 0);
+}
+
+}
+
+void xe_ppc_state::SetRegFromString(const char* name, const char* value) {
+  int n;
+  if (sscanf(name, "r%d", &n) == 1) {
+    this->r[n] = ParseInt64(value);
+  } else {
+    printf("Unrecognized register name: %s\n", name);
+  }
+}
+
+bool xe_ppc_state::CompareRegWithString(
+    const char* name, const char* value,
+    char* out_value, size_t out_value_size) {
+  int n;
+  if (sscanf(name, "r%d", &n) == 1) {
+    uint64_t expected = ParseInt64(value);
+    if (this->r[n] != expected) {
+      xesnprintfa(out_value, out_value_size, "%016llX", this->r[n]);
+      return false;
+    }
+    return true;
+  } else {
+    printf("Unrecognized register name: %s\n", name);
+    return false;
+  }
+}
diff --git a/src/cpu/processor.cc b/src/cpu/processor.cc
index e7a44c554..a627a452b 100644
--- a/src/cpu/processor.cc
+++ b/src/cpu/processor.cc
@@ -10,6 +10,7 @@
 #include <xenia/cpu/processor.h>
 
 #include <llvm/ExecutionEngine/ExecutionEngine.h>
+#include <llvm/ExecutionEngine/GenericValue.h>
 #include <llvm/ExecutionEngine/Interpreter.h>
 #include <llvm/ExecutionEngine/JIT.h>
 #include <llvm/IR/LLVMContext.h>
@@ -97,6 +98,7 @@ int Processor::PrepareModule(
     return 1;
   }
 
+  exec_module->AddFunctionsToMap(all_fns_);
   modules_.push_back(exec_module);
 
   exec_module->Dump();
@@ -115,6 +117,7 @@ int Processor::PrepareModule(UserModule* user_module,
     return 1;
   }
 
+  exec_module->AddFunctionsToMap(all_fns_);
   modules_.push_back(exec_module);
 
   //user_module->Dump(export_resolver.get());
@@ -123,12 +126,58 @@ int Processor::PrepareModule(UserModule* user_module,
   return 0;
 }
 
-int Processor::Execute(uint32_t address) {
-  // TODO(benvanik): implement execute.
-  return 0;
-}
-
 uint32_t Processor::CreateCallback(void (*callback)(void* data), void* data) {
   // TODO(benvanik): implement callback creation.
   return 0;
 }
+
+ThreadState* Processor::AllocThread(uint32_t stack_address,
+                                    uint32_t stack_size) {
+  ThreadState* thread_state = new ThreadState(
+      this, stack_address, stack_size);
+  return thread_state;
+}
+
+void Processor::DeallocThread(ThreadState* thread_state) {
+  delete thread_state;
+}
+
+int Processor::Execute(ThreadState* thread_state, uint32_t address) {
+  // Find the function to execute.
+  Function* f = GetFunction(address);
+  if (!f) {
+    XELOGCPU("Failed to find function %.8X to execute.\n", address);
+    return 1;
+  }
+
+  xe_ppc_state_t* ppc_state = thread_state->ppc_state();
+
+  // This could be set to anything to give us a unique identifier to track
+  // re-entrancy/etc.
+  uint32_t lr = 0xBEBEBEBE;
+
+  // Setup registers.
+  ppc_state->lr = 0xBEBEBEBE;
+
+  // Args:
+  // - i8* state
+  // - i64 lr
+  std::vector<GenericValue> args;
+  args.push_back(PTOGV(ppc_state));
+  GenericValue lr_arg;
+  lr_arg.IntVal = APInt(64, lr);
+  args.push_back(lr_arg);
+
+  GenericValue ret = engine_->runFunction(f, args);
+
+  //return (uint32_t)ret.IntVal.getSExtValue();
+  return 0;
+}
+
+Function* Processor::GetFunction(uint32_t address) {
+  FunctionMap::iterator it = all_fns_.find(address);
+  if (it != all_fns_.end()) {
+    return it->second;
+  }
+  return NULL;
+}
diff --git a/src/cpu/sdb.cc b/src/cpu/sdb.cc
index 3726a546a..4e499d527 100644
--- a/src/cpu/sdb.cc
+++ b/src/cpu/sdb.cc
@@ -15,6 +15,7 @@
 #include <xenia/cpu/ppc/instr.h>
 
 
+using namespace std;
 using namespace xe;
 using namespace xe::cpu;
 using namespace xe::cpu::ppc;
diff --git a/src/cpu/sources.gypi b/src/cpu/sources.gypi
index 6aa30e68d..ac90e3708 100644
--- a/src/cpu/sources.gypi
+++ b/src/cpu/sources.gypi
@@ -5,6 +5,7 @@
     'exec_module.cc',
     'processor.cc',
     'sdb.cc',
+    'thread_state.cc',
   ],
 
   'includes': [
diff --git a/src/cpu/thread_state.cc b/src/cpu/thread_state.cc
new file mode 100644
index 000000000..6c1ac0469
--- /dev/null
+++ b/src/cpu/thread_state.cc
@@ -0,0 +1,38 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <xenia/cpu/thread_state.h>
+
+
+using namespace xe;
+using namespace xe::cpu;
+
+
+ThreadState::ThreadState(
+    Processor* processor,
+    uint32_t stack_address, uint32_t stack_size) {
+  stack_address_ = stack_address;
+  stack_size_ = stack_size;
+
+  xe_zero_struct(&ppc_state_, sizeof(ppc_state_));
+
+  // Stash pointers to common structures that callbacks may need.
+  ppc_state_.processor    = processor;
+  ppc_state_.thread_state = this;
+
+  // Set initial registers.
+  ppc_state_.r[1] = stack_address_;
+}
+
+ThreadState::~ThreadState() {
+}
+
+xe_ppc_state_t* ThreadState::ppc_state() {
+  return &ppc_state_;
+}
diff --git a/test/codegen/ori.bin b/test/codegen/ori.bin
index dffec1c24..a95f2547a 100755
Binary files a/test/codegen/ori.bin and b/test/codegen/ori.bin differ
diff --git a/test/codegen/ori.dis b/test/codegen/ori.dis
index 40cb4d543..c93421a54 100644
--- a/test/codegen/ori.dis
+++ b/test/codegen/ori.dis
@@ -5,5 +5,5 @@ ori.o:     file format elf64-powerpc
 Disassembly of section .text:
 
 0000000082010000 <.text>:
-    82010000:	60 83 ff ff 	ori     r3,r4,65535
+    82010000:	60 83 fe dc 	ori     r3,r4,65244
     82010004:	4e 80 00 20 	blr
diff --git a/test/codegen/ori.s b/test/codegen/ori.s
index 7375a1e08..130aec7bc 100644
--- a/test/codegen/ori.s
+++ b/test/codegen/ori.s
@@ -1,6 +1,7 @@
-# REGISTER_IN r4 0xDEADBEEFCAFEBABE
+# REGISTER_IN r4 0xDEADBEEF00000000
 
-ori r3, r4, 0xFFFF
+ori r3, r4, 0xFEDC
 
 blr
-# REGISTER_OUT r3 0xBABE
+# REGISTER_OUT r3 0xDEADBEEF0000FEDC
+# REGISTER_OUT r4 0xDEADBEEF00000000
diff --git a/third_party/sparsehash b/third_party/sparsehash
new file mode 160000
index 000000000..09af64be1
--- /dev/null
+++ b/third_party/sparsehash
@@ -0,0 +1 @@
+Subproject commit 09af64be1e18018f5d7a1ff337bed0f32e8067f2
diff --git a/third_party/sparsehash.gypi b/third_party/sparsehash.gypi
new file mode 100644
index 000000000..b9f124813
--- /dev/null
+++ b/third_party/sparsehash.gypi
@@ -0,0 +1,30 @@
+# Copyright 2013 Ben Vanik. All Rights Reserved.
+{
+  'targets': [
+    {
+      'target_name': 'sparsehash',
+      'type': 'static_library',
+
+      'direct_dependent_settings': {
+        'include_dirs': [
+          'sparsehash/src/',
+        ],
+      },
+
+      'include_dirs': [
+        'sparsehash/src/',
+      ],
+
+      'sources': [
+      ],
+
+      'conditions': [
+        ['OS == "win"', {
+          'sources!': [
+            'sparsehash/src/windows/port.cc',
+          ],
+        }],
+      ],
+    }
+  ]
+}
diff --git a/tools/xenia-test/xenia-test.cc b/tools/xenia-test/xenia-test.cc
index 7753b14b1..c5ff80905 100644
--- a/tools/xenia-test/xenia-test.cc
+++ b/tools/xenia-test/xenia-test.cc
@@ -55,25 +55,47 @@ int read_annotations(xe_pal_ref pal, string& src_file_path,
 }
 
 int setup_test_state(xe_memory_ref memory, Processor* processor,
+                     ThreadState* thread_state,
                      annotations_list_t& annotations) {
+  xe_ppc_state_t* ppc_state = thread_state->ppc_state();
+
   for (annotations_list_t::iterator it = annotations.begin();
        it != annotations.end(); ++it) {
     if (it->first == "REGISTER_IN") {
-      printf("REGISTER_IN : %s\n", it->second.c_str());
+      size_t space_pos = it->second.find(" ");
+      string reg_name = it->second.substr(0, space_pos);
+      string reg_value = it->second.substr(space_pos + 1);
+      ppc_state->SetRegFromString(reg_name.c_str(), reg_value.c_str());
     }
   }
   return 0;
 }
 
 int check_test_results(xe_memory_ref memory, Processor* processor,
+                       ThreadState* thread_state,
                        annotations_list_t& annotations) {
+  xe_ppc_state_t* ppc_state = thread_state->ppc_state();
+
+  char actual_value[2048];
+
+  bool any_failed = false;
   for (annotations_list_t::iterator it = annotations.begin();
        it != annotations.end(); ++it) {
     if (it->first == "REGISTER_OUT") {
-      printf("REGISTER_OUT : %s\n", it->second.c_str());
+      size_t space_pos = it->second.find(" ");
+      string reg_name = it->second.substr(0, space_pos);
+      string reg_value = it->second.substr(space_pos + 1);
+      if (!ppc_state->CompareRegWithString(
+          reg_name.c_str(), reg_value.c_str(),
+          actual_value, XECOUNT(actual_value))) {
+        any_failed = true;
+        printf("Register %s assert failed:\n", reg_name.c_str());
+        printf("  Expected: %s == %s\n", reg_name.c_str(), reg_value.c_str());
+        printf("    Actual: %s == %s\n", reg_name.c_str(), actual_value);
+      }
     }
   }
-  return 0;
+  return any_failed;
 }
 
 int run_test(xe_pal_ref pal, string& src_file_path) {
@@ -89,6 +111,7 @@ int run_test(xe_pal_ref pal, string& src_file_path) {
   shared_ptr<Processor> processor;
   shared_ptr<Runtime> runtime;
   annotations_list_t annotations;
+  ThreadState* thread_state = NULL;
 
   XEEXPECTZERO(read_annotations(pal, src_file_path, annotations));
 
@@ -105,17 +128,25 @@ int run_test(xe_pal_ref pal, string& src_file_path) {
   // Load the binary module.
   XEEXPECTZERO(runtime->LoadBinaryModule(bin_file_path.c_str(), 0x82010000));
 
+  // Simulate a thread.
+  thread_state = processor->AllocThread(0x80000000, 256 * 1024 * 1024);
+
   // Setup test state from annotations.
-  XEEXPECTZERO(setup_test_state(memory, processor.get(), annotations));
+  XEEXPECTZERO(setup_test_state(memory, processor.get(), thread_state,
+                                annotations));
 
   // Execute test.
-  XEEXPECTZERO(processor->Execute(0x82010000));
+  XEEXPECTZERO(processor->Execute(thread_state, 0x82010000));
 
   // Assert test state expectations.
-  XEEXPECTZERO(check_test_results(memory, processor.get(), annotations));
+  XEEXPECTZERO(check_test_results(memory, processor.get(), thread_state,
+                                  annotations));
 
   result_code = 0;
 XECLEANUP:
+  if (processor && thread_state) {
+    processor->DeallocThread(thread_state);
+  }
   runtime.reset();
   processor.reset();
   xe_memory_release(memory);
@@ -172,12 +203,12 @@ int run_tests(const xechar_t* test_name) {
       continue;
     }
 
-    printf("Running %s... ", (*it).c_str());
+    printf("Running %s...\n", (*it).c_str());
     if (run_test(pal, *it)) {
-      printf("FAILED\n");
+      printf("TEST FAILED\n");
       failed_count++;
     } else {
-      printf("PASSED\n");
+      printf("Passed\n");
       passed_count++;
     }
   }
diff --git a/xenia.gyp b/xenia.gyp
index 66ba61203..b2a36eb4b 100644
--- a/xenia.gyp
+++ b/xenia.gyp
@@ -4,6 +4,7 @@
     'common.gypi',
     'tools/tools.gypi',
     'third_party/gflags.gypi',
+    'third_party/sparsehash.gypi',
   ],
 
   'targets': [