diff --git a/src/xenia/base/clock_posix.cc b/src/xenia/base/clock_posix.cc
new file mode 100644
index 000000000..6fb2f652a
--- /dev/null
+++ b/src/xenia/base/clock_posix.cc
@@ -0,0 +1,46 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/clock.h"
+
+#include <sys/time.h>
+#include <time.h>
+
+namespace xe {
+
+uint64_t Clock::host_tick_frequency() {
+  timespec res;
+  clock_getres(CLOCK_MONOTONIC_RAW, &res);
+
+  return uint64_t(res.tv_sec) + uint64_t(res.tv_nsec) * 1000000000ull;
+}
+
+uint64_t Clock::QueryHostTickCount() {
+  timespec res;
+  clock_gettime(CLOCK_MONOTONIC_RAW, &res);
+
+  return uint64_t(res.tv_sec) + uint64_t(res.tv_nsec) * 1000000000ull;
+}
+
+uint64_t Clock::QueryHostSystemTime() {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+
+  uint64_t ret = tv.tv_usec;
+  ret /= 1000;  // usec -> msec
+
+  ret += (tv.tv_sec * 1000);  // sec -> msec
+  return ret;
+}
+
+uint32_t Clock::QueryHostUptimeMillis() {
+  return uint32_t(QueryHostTickCount() / (host_tick_frequency() / 1000));
+}
+
+}  // namespace xe
\ No newline at end of file
diff --git a/src/xenia/base/debugging_posix.cc b/src/xenia/base/debugging_posix.cc
new file mode 100644
index 000000000..f002c5ed2
--- /dev/null
+++ b/src/xenia/base/debugging_posix.cc
@@ -0,0 +1,33 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/debugging.h"
+
+#include <signal.h>
+#include "xenia/base/string_buffer.h"
+
+namespace xe {
+namespace debugging {
+
+bool IsDebuggerAttached() { return false; }
+void Break() { raise(SIGTRAP); }
+
+void DebugPrint(const char* fmt, ...) {
+  StringBuffer buff;
+
+  va_list va;
+  va_start(va, fmt);
+  buff.AppendVarargs(fmt, va);
+  va_end(va);
+
+  // OutputDebugStringA(buff.GetString());
+}
+
+}  // namespace debugging
+}  // namespace xe
diff --git a/src/xenia/base/exception_handler_posix.cc b/src/xenia/base/exception_handler_posix.cc
new file mode 100644
index 000000000..5c3aa81f0
--- /dev/null
+++ b/src/xenia/base/exception_handler_posix.cc
@@ -0,0 +1,18 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/exception_handler.h"
+
+namespace xe {
+
+// TODO(DrChat): Exception handling on linux.
+void ExceptionHandler::Install(Handler fn, void* data) {}
+void ExceptionHandler::Uninstall(Handler fn, void* data) {}
+
+}  // namespace xe
\ No newline at end of file
diff --git a/src/xenia/base/filesystem_posix.cc b/src/xenia/base/filesystem_posix.cc
new file mode 100644
index 000000000..a4e55fc5d
--- /dev/null
+++ b/src/xenia/base/filesystem_posix.cc
@@ -0,0 +1,63 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/filesystem.h"
+#include "xenia/base/logging.h"
+#include "xenia/base/string.h"
+
+#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace xe {
+namespace filesystem {
+
+bool PathExists(const std::wstring& path) {
+  struct stat st;
+  return stat(xe::to_string(path).c_str(), &st) == 0;
+}
+
+FILE* OpenFile(const std::wstring& path, const char* mode) {
+  auto fixed_path = xe::fix_path_separators(path);
+  return fopen(xe::to_string(fixed_path).c_str(), mode);
+}
+
+bool CreateFolder(const std::wstring& path) {
+  return mkdir(xe::to_string(path).c_str(), 0774);
+}
+
+std::vector<FileInfo> ListFiles(const std::wstring& path) {
+  std::vector<FileInfo> result;
+
+  DIR* dir = opendir(xe::to_string(path).c_str());
+  if (!dir) {
+    return result;
+  }
+
+  while (auto ent = readdir(dir)) {
+    FileInfo info;
+    std::memset(&info, 0, sizeof(info));
+    if (ent->d_type == DT_DIR) {
+      info.type = FileInfo::Type::kDirectory;
+      info.total_size = 0;
+    } else {
+      info.type = FileInfo::Type::kFile;
+      info.total_size = 0;  // TODO(DrChat): Find a way to get this
+    }
+
+    info.name = xe::to_wstring(ent->d_name);
+    result.push_back(info);
+  }
+
+  return result;
+}
+
+}  // namespace filesystem
+}  // namespace xe
\ No newline at end of file
diff --git a/src/xenia/base/logging.cc b/src/xenia/base/logging.cc
index 720bf271c..b81ff0b91 100644
--- a/src/xenia/base/logging.cc
+++ b/src/xenia/base/logging.cc
@@ -53,7 +53,6 @@ class Logger {
       file_ = xe::filesystem::OpenFile(file_path, "wt");
     }
 
-    flush_event_ = xe::threading::Event::CreateAutoResetEvent(false);
     write_thread_ =
         xe::threading::Thread::Create({}, [this]() { WriteThread(); });
     write_thread_->set_name("xe::FileLogSink Writer");
@@ -61,7 +60,6 @@ class Logger {
 
   ~Logger() {
     running_ = false;
-    flush_event_->Set();
     xe::threading::Wait(write_thread_.get(), true);
     fflush(file_);
     fclose(file_);
@@ -113,9 +111,6 @@ class Logger {
         continue;
       }
     }
-
-    // Kick the consumer thread
-    flush_event_->Set();
   }
 
  private:
@@ -139,6 +134,7 @@ class Logger {
 
   void WriteThread() {
     RingBuffer rb(buffer_, kBufferSize);
+    uint32_t idle_loops = 0;
     while (running_) {
       bool did_write = false;
       rb.set_write_offset(write_tail_);
@@ -197,9 +193,16 @@ class Logger {
         if (FLAGS_flush_log) {
           fflush(file_);
         }
+
+        idle_loops = 0;
+      } else {
+        if (idle_loops > 1000) {
+          // Introduce a waiting period.
+          xe::threading::Sleep(std::chrono::milliseconds(50));
+        }
+
+        idle_loops++;
       }
-      xe::threading::Wait(flush_event_.get(), true,
-                          std::chrono::milliseconds(1));
     }
   }
 
@@ -210,7 +213,6 @@ class Logger {
   FILE* file_ = nullptr;
 
   std::atomic<bool> running_;
-  std::unique_ptr<xe::threading::Event> flush_event_;
   std::unique_ptr<xe::threading::Thread> write_thread_;
 };
 
diff --git a/src/xenia/base/mapped_memory_posix.cc b/src/xenia/base/mapped_memory_posix.cc
index 07c80f4d6..6d48a0157 100644
--- a/src/xenia/base/mapped_memory_posix.cc
+++ b/src/xenia/base/mapped_memory_posix.cc
@@ -74,4 +74,10 @@ std::unique_ptr<MappedMemory> MappedMemory::Open(const std::wstring& path,
   return std::move(mm);
 }
 
+std::unique_ptr<ChunkedMappedMemoryWriter> ChunkedMappedMemoryWriter::Open(
+    const std::wstring& path, size_t chunk_size, bool low_address_space) {
+  // TODO(DrChat)
+  return nullptr;
+}
+
 }  // namespace xe
diff --git a/src/xenia/base/memory_posix.cc b/src/xenia/base/memory_posix.cc
new file mode 100644
index 000000000..d6b0dd062
--- /dev/null
+++ b/src/xenia/base/memory_posix.cc
@@ -0,0 +1,57 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/memory.h"
+
+#include <unistd.h>
+
+namespace xe {
+namespace memory {
+
+size_t page_size() { return getpagesize(); }
+size_t allocation_granularity() { return page_size(); }
+
+void* AllocFixed(void* base_address, size_t length,
+                 AllocationType allocation_type, PageAccess access) {
+  return nullptr;
+}
+
+bool DeallocFixed(void* base_address, size_t length,
+                  DeallocationType deallocation_type) {
+  return false;
+}
+
+bool Protect(void* base_address, size_t length, PageAccess access,
+             PageAccess* out_old_access) {
+  return false;
+}
+
+bool QueryProtect(void* base_address, size_t& length, PageAccess& access_out) {
+  return false;
+}
+
+FileMappingHandle CreateFileMappingHandle(std::wstring path, size_t length,
+                                          PageAccess access, bool commit) {
+  return nullptr;
+}
+
+void CloseFileMappingHandle(FileMappingHandle handle) {}
+
+void* MapFileView(FileMappingHandle handle, void* base_address, size_t length,
+                  PageAccess access, size_t file_offset) {
+  return nullptr;
+}
+
+bool UnmapFileView(FileMappingHandle handle, void* base_address,
+                   size_t length) {
+  return false;
+}
+
+}  // namespace memory
+}  // namespace xe
diff --git a/src/xenia/base/platform_posix.h b/src/xenia/base/platform_posix.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/xenia/base/threading_posix.cc b/src/xenia/base/threading_posix.cc
index 4b60baaf7..7f264e644 100644
--- a/src/xenia/base/threading_posix.cc
+++ b/src/xenia/base/threading_posix.cc
@@ -7,20 +7,24 @@
  ******************************************************************************
  */
 
+#include "xenia/base/assert.h"
+#include "xenia/base/logging.h"
 #include "xenia/base/threading.h"
 
 #include <pthread.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
 #include <time.h>
+#include <unistd.h>
 
 namespace xe {
 namespace threading {
 
 // uint64_t ticks() { return mach_absolute_time(); }
 
-// uint32_t current_thread_id() {
-//   mach_port_t tid = pthread_mach_thread_np(pthread_self());
-//   return static_cast<uint32_t>(tid);
-// }
+uint32_t current_thread_system_id() {
+  return static_cast<uint32_t>(syscall(SYS_gettid));
+}
 
 void set_name(const std::string& name) {
   pthread_setname_np(pthread_self(), name.c_str());
@@ -36,5 +40,103 @@ void Sleep(std::chrono::microseconds duration) {
   // TODO(benvanik): spin while rmtp >0?
 }
 
+template <typename T>
+class PosixHandle : public T {
+ public:
+  explicit PosixHandle(pthread_t handle) : handle_(handle) {}
+  ~PosixHandle() override {}
+
+ protected:
+  void* native_handle() const override {
+    return reinterpret_cast<void*>(handle_);
+  }
+
+  pthread_t handle_;
+};
+
+class PosixThread : public PosixHandle<Thread> {
+ public:
+  explicit PosixThread(pthread_t handle) : PosixHandle(handle) {}
+  ~PosixThread() = default;
+
+  void set_name(std::string name) override {
+    // TODO(DrChat)
+  }
+
+  uint32_t system_id() const override { return 0; }
+
+  // TODO(DrChat)
+  uint64_t affinity_mask() override { return 0; }
+  void set_affinity_mask(uint64_t mask) override { assert_always(); }
+
+  int priority() override {
+    int policy;
+    struct sched_param param;
+    int ret = pthread_getschedparam(handle_, &policy, &param);
+    if (ret != 0) {
+      return -1;
+    }
+
+    return param.sched_priority;
+  }
+
+  void set_priority(int new_priority) override {
+    struct sched_param param;
+    param.sched_priority = new_priority;
+    int ret = pthread_setschedparam(handle_, SCHED_FIFO, &param);
+  }
+
+  // TODO(DrChat)
+  void QueueUserCallback(std::function<void()> callback) override {
+    assert_always();
+  }
+
+  bool Resume(uint32_t* out_new_suspend_count = nullptr) override {
+    assert_always();
+    return false;
+  }
+
+  bool Suspend(uint32_t* out_previous_suspend_count = nullptr) override {
+    assert_always();
+    return false;
+  }
+
+  void Terminate(int exit_code) override {}
+};
+
+thread_local std::unique_ptr<PosixThread> current_thread_ = nullptr;
+
+struct ThreadStartData {
+  std::function<void()> start_routine;
+};
+void* ThreadStartRoutine(void* parameter) {
+  current_thread_ = std::make_unique<PosixThread>(::pthread_self());
+
+  auto start_data = reinterpret_cast<ThreadStartData*>(parameter);
+  start_data->start_routine();
+  delete start_data;
+  return 0;
+}
+
+std::unique_ptr<Thread> Thread::Create(CreationParameters params,
+                                       std::function<void()> start_routine) {
+  auto start_data = new ThreadStartData({std::move(start_routine)});
+
+  assert_false(params.create_suspended);
+  pthread_t handle;
+  pthread_attr_t attr;
+  pthread_attr_init(&attr);
+  int ret = pthread_create(&handle, &attr, ThreadStartRoutine, start_data);
+  if (ret != 0) {
+    // TODO(benvanik): pass back?
+    auto last_error = errno;
+    XELOGE("Unable to pthread_create: %d", last_error);
+    delete start_data;
+    return nullptr;
+  }
+
+  return std::make_unique<PosixThread>(handle);
+}
+
 }  // namespace threading
 }  // namespace xe
diff --git a/src/xenia/cpu/backend/backend.cc b/src/xenia/cpu/backend/backend.cc
index 01c696c34..6773d5c99 100644
--- a/src/xenia/cpu/backend/backend.cc
+++ b/src/xenia/cpu/backend/backend.cc
@@ -15,14 +15,13 @@ namespace xe {
 namespace cpu {
 namespace backend {
 
-Backend::Backend(Processor* processor)
-    : processor_(processor), code_cache_(nullptr) {
-  std::memset(&machine_info_, 0, sizeof(machine_info_));
-}
-
+Backend::Backend() { std::memset(&machine_info_, 0, sizeof(machine_info_)); }
 Backend::~Backend() = default;
 
-bool Backend::Initialize() { return true; }
+bool Backend::Initialize(Processor* processor) {
+  processor_ = processor;
+  return true;
+}
 
 void* Backend::AllocThreadData() { return nullptr; }
 
diff --git a/src/xenia/cpu/backend/backend.h b/src/xenia/cpu/backend/backend.h
index 4d6f68346..054d7e752 100644
--- a/src/xenia/cpu/backend/backend.h
+++ b/src/xenia/cpu/backend/backend.h
@@ -34,14 +34,14 @@ class CodeCache;
 
 class Backend {
  public:
-  explicit Backend(Processor* processor);
+  explicit Backend();
   virtual ~Backend();
 
   Processor* processor() const { return processor_; }
   const MachineInfo* machine_info() const { return &machine_info_; }
   CodeCache* code_cache() const { return code_cache_; }
 
-  virtual bool Initialize();
+  virtual bool Initialize(Processor* processor);
 
   virtual void* AllocThreadData();
   virtual void FreeThreadData(void* thread_data);
@@ -65,9 +65,9 @@ class Backend {
   virtual void UninstallBreakpoint(Breakpoint* breakpoint) {}
 
  protected:
-  Processor* processor_;
+  Processor* processor_ = nullptr;
   MachineInfo machine_info_;
-  CodeCache* code_cache_;
+  CodeCache* code_cache_ = nullptr;
 };
 
 }  // namespace backend
diff --git a/src/xenia/cpu/backend/x64/x64_backend.cc b/src/xenia/cpu/backend/x64/x64_backend.cc
index 5245e82da..7739c9519 100644
--- a/src/xenia/cpu/backend/x64/x64_backend.cc
+++ b/src/xenia/cpu/backend/x64/x64_backend.cc
@@ -42,8 +42,7 @@ class X64ThunkEmitter : public X64Emitter {
   ResolveFunctionThunk EmitResolveFunctionThunk();
 };
 
-X64Backend::X64Backend(Processor* processor)
-    : Backend(processor), code_cache_(nullptr) {
+X64Backend::X64Backend() : Backend(), code_cache_(nullptr) {
   if (cs_open(CS_ARCH_X86, CS_MODE_64, &capstone_handle_) != CS_ERR_OK) {
     assert_always("Failed to initialize capstone");
   }
@@ -61,8 +60,8 @@ X64Backend::~X64Backend() {
   ExceptionHandler::Uninstall(&ExceptionCallbackThunk, this);
 }
 
-bool X64Backend::Initialize() {
-  if (!Backend::Initialize()) {
+bool X64Backend::Initialize(Processor* processor) {
+  if (!Backend::Initialize(processor)) {
     return false;
   }
 
diff --git a/src/xenia/cpu/backend/x64/x64_backend.h b/src/xenia/cpu/backend/x64/x64_backend.h
index d0e9e2627..19c4caab3 100644
--- a/src/xenia/cpu/backend/x64/x64_backend.h
+++ b/src/xenia/cpu/backend/x64/x64_backend.h
@@ -38,7 +38,7 @@ class X64Backend : public Backend {
  public:
   static const uint32_t kForceReturnAddress = 0x9FFF0000u;
 
-  explicit X64Backend(Processor* processor);
+  explicit X64Backend();
   ~X64Backend() override;
 
   X64CodeCache* code_cache() const { return code_cache_.get(); }
@@ -53,7 +53,7 @@ class X64Backend : public Backend {
     return resolve_function_thunk_;
   }
 
-  bool Initialize() override;
+  bool Initialize(Processor* processor) override;
 
   void CommitExecutableRange(uint32_t guest_low, uint32_t guest_high) override;
 
diff --git a/src/xenia/cpu/backend/x64/x64_code_cache_posix.cc b/src/xenia/cpu/backend/x64/x64_code_cache_posix.cc
new file mode 100644
index 000000000..490ab2ce9
--- /dev/null
+++ b/src/xenia/cpu/backend/x64/x64_code_cache_posix.cc
@@ -0,0 +1,51 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/cpu/backend/x64/x64_code_cache.h"
+
+namespace xe {
+namespace cpu {
+namespace backend {
+namespace x64 {
+
+class PosixX64CodeCache : public X64CodeCache {
+ public:
+  PosixX64CodeCache();
+  ~PosixX64CodeCache() override;
+
+  bool Initialize() override;
+
+  void* LookupUnwindInfo(uint64_t host_pc) override { return nullptr; }
+
+ private:
+  /*
+  UnwindReservation RequestUnwindReservation(uint8_t* entry_address) override;
+  void PlaceCode(uint32_t guest_address, void* machine_code, size_t code_size,
+                 size_t stack_size, void* code_address,
+                 UnwindReservation unwind_reservation) override;
+
+  void InitializeUnwindEntry(uint8_t* unwind_entry_address,
+                             size_t unwind_table_slot, void* code_address,
+                             size_t code_size, size_t stack_size);
+  */
+};
+
+std::unique_ptr<X64CodeCache> X64CodeCache::Create() {
+  return std::make_unique<PosixX64CodeCache>();
+}
+
+PosixX64CodeCache::PosixX64CodeCache() = default;
+PosixX64CodeCache::~PosixX64CodeCache() = default;
+
+bool PosixX64CodeCache::Initialize() { return X64CodeCache::Initialize(); }
+
+}  // namespace x64
+}  // namespace backend
+}  // namespace cpu
+}  // namespace xe
\ No newline at end of file
diff --git a/src/xenia/cpu/ppc/testing/ppc_testing_main.cc b/src/xenia/cpu/ppc/testing/ppc_testing_main.cc
index 08e015614..443159f92 100644
--- a/src/xenia/cpu/ppc/testing/ppc_testing_main.cc
+++ b/src/xenia/cpu/ppc/testing/ppc_testing_main.cc
@@ -15,6 +15,7 @@
 #include "xenia/base/math.h"
 #include "xenia/base/platform.h"
 #include "xenia/cpu/backend/x64/x64_backend.h"
+#include "xenia/cpu/cpu_flags.h"
 #include "xenia/cpu/ppc/ppc_context.h"
 #include "xenia/cpu/ppc/ppc_frontend.h"
 #include "xenia/cpu/processor.h"
@@ -188,9 +189,25 @@ class TestRunner {
     // Reset memory.
     memory->Reset();
 
+    std::unique_ptr<xe::cpu::backend::Backend> backend;
+    if (!backend) {
+#if defined(XENIA_HAS_X64_BACKEND) && XENIA_HAS_X64_BACKEND
+      if (FLAGS_cpu == "x64") {
+        backend.reset(new xe::cpu::backend::x64::X64Backend());
+      }
+#endif  // XENIA_HAS_X64_BACKEND
+      if (FLAGS_cpu == "any") {
+#if defined(XENIA_HAS_X64_BACKEND) && XENIA_HAS_X64_BACKEND
+        if (!backend) {
+          backend.reset(new xe::cpu::backend::x64::X64Backend());
+        }
+#endif  // XENIA_HAS_X64_BACKEND
+      }
+    }
+
     // Setup a fresh processor.
     processor.reset(new Processor(memory.get(), nullptr));
-    processor->Setup();
+    processor->Setup(std::move(backend));
     processor->set_debug_info_flags(DebugInfoFlags::kDebugInfoAll);
 
     // Load the binary module.
diff --git a/src/xenia/cpu/ppc/testing/premake5.lua b/src/xenia/cpu/ppc/testing/premake5.lua
index 57a79aa40..c1f4f4cc9 100644
--- a/src/xenia/cpu/ppc/testing/premake5.lua
+++ b/src/xenia/cpu/ppc/testing/premake5.lua
@@ -7,9 +7,9 @@ project("xenia-cpu-ppc-tests")
   kind("ConsoleApp")
   language("C++")
   links({
+    "xenia-core",
     "xenia-cpu-backend-x64",
     "xenia-cpu",
-    "xenia-core",
     "xenia-base",
     "gflags",
     "capstone", -- cpu-backend-x64
diff --git a/src/xenia/cpu/processor.cc b/src/xenia/cpu/processor.cc
index 2877a79b7..8088e4bb1 100644
--- a/src/xenia/cpu/processor.cc
+++ b/src/xenia/cpu/processor.cc
@@ -95,7 +95,7 @@ Processor::~Processor() {
   }
 }
 
-bool Processor::Setup() {
+bool Processor::Setup(std::unique_ptr<backend::Backend> backend) {
   // TODO(benvanik): query mode from debugger?
   debug_info_flags_ = 0;
 
@@ -113,26 +113,10 @@ bool Processor::Setup() {
     return false;
   }
 
-  std::unique_ptr<xe::cpu::backend::Backend> backend;
-  if (!backend) {
-#if defined(XENIA_HAS_X64_BACKEND) && XENIA_HAS_X64_BACKEND
-    if (FLAGS_cpu == "x64") {
-      backend.reset(new xe::cpu::backend::x64::X64Backend(this));
-    }
-#endif  // XENIA_HAS_X64_BACKEND
-    if (FLAGS_cpu == "any") {
-#if defined(XENIA_HAS_X64_BACKEND) && XENIA_HAS_X64_BACKEND
-      if (!backend) {
-        backend.reset(new xe::cpu::backend::x64::X64Backend(this));
-      }
-#endif  // XENIA_HAS_X64_BACKEND
-    }
-  }
-
   if (!backend) {
     return false;
   }
-  if (!backend->Initialize()) {
+  if (!backend->Initialize(this)) {
     return false;
   }
   if (!frontend->Initialize()) {
diff --git a/src/xenia/cpu/processor.h b/src/xenia/cpu/processor.h
index 4ea6d4429..57f714593 100644
--- a/src/xenia/cpu/processor.h
+++ b/src/xenia/cpu/processor.h
@@ -71,7 +71,7 @@ class Processor {
   backend::Backend* backend() const { return backend_.get(); }
   ExportResolver* export_resolver() const { return export_resolver_; }
 
-  bool Setup();
+  bool Setup(std::unique_ptr<backend::Backend> backend);
 
   // Runs any pre-launch logic once the module and thread have been setup.
   void PreLaunch();
diff --git a/src/xenia/cpu/stack_walker_posix.cc b/src/xenia/cpu/stack_walker_posix.cc
new file mode 100644
index 000000000..eba6e30cc
--- /dev/null
+++ b/src/xenia/cpu/stack_walker_posix.cc
@@ -0,0 +1,24 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2017 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/cpu/stack_walker.h"
+
+#include "xenia/base/logging.h"
+
+namespace xe {
+namespace cpu {
+
+std::unique_ptr<StackWalker> StackWalker::Create(
+    backend::CodeCache* code_cache) {
+  XELOGD("Stack walker unimplemented on posix");
+  return nullptr;
+}
+
+}  // namespace cpu
+}  // namespace xe
\ No newline at end of file
diff --git a/src/xenia/cpu/testing/util.h b/src/xenia/cpu/testing/util.h
index c04f0a756..075903455 100644
--- a/src/xenia/cpu/testing/util.h
+++ b/src/xenia/cpu/testing/util.h
@@ -39,8 +39,9 @@ class TestFunction {
 
 #if XENIA_TEST_X64
     {
+      auto backend = std::make_unique<xe::cpu::backend::x64::X64Backend>();
       auto processor = std::make_unique<Processor>(memory.get(), nullptr);
-      processor->Setup();
+      processor->Setup(std::move(backend));
       processors.emplace_back(std::move(processor));
     }
 #endif  // XENIA_TEST_X64
diff --git a/src/xenia/emulator.cc b/src/xenia/emulator.cc
index ef9c4694d..d90530cdb 100644
--- a/src/xenia/emulator.cc
+++ b/src/xenia/emulator.cc
@@ -23,6 +23,8 @@
 #include "xenia/base/profiling.h"
 #include "xenia/base/string.h"
 #include "xenia/cpu/backend/code_cache.h"
+#include "xenia/cpu/backend/x64/x64_backend.h"
+#include "xenia/cpu/cpu_flags.h"
 #include "xenia/cpu/thread_state.h"
 #include "xenia/gpu/graphics_system.h"
 #include "xenia/hid/input_driver.h"
@@ -107,10 +109,26 @@ X_STATUS Emulator::Setup(
   // Shared export resolver used to attach and query for HLE exports.
   export_resolver_ = std::make_unique<xe::cpu::ExportResolver>();
 
+  std::unique_ptr<xe::cpu::backend::Backend> backend;
+  if (!backend) {
+#if defined(XENIA_HAS_X64_BACKEND) && XENIA_HAS_X64_BACKEND
+    if (FLAGS_cpu == "x64") {
+      backend.reset(new xe::cpu::backend::x64::X64Backend());
+    }
+#endif  // XENIA_HAS_X64_BACKEND
+    if (FLAGS_cpu == "any") {
+#if defined(XENIA_HAS_X64_BACKEND) && XENIA_HAS_X64_BACKEND
+      if (!backend) {
+        backend.reset(new xe::cpu::backend::x64::X64Backend());
+      }
+#endif  // XENIA_HAS_X64_BACKEND
+    }
+  }
+
   // Initialize the CPU.
   processor_ = std::make_unique<xe::cpu::Processor>(memory_.get(),
                                                     export_resolver_.get());
-  if (!processor_->Setup()) {
+  if (!processor_->Setup(std::move(backend))) {
     return X_STATUS_UNSUCCESSFUL;
   }