diff --git a/runtime/arch/stub_test.cc b/runtime/arch/stub_test.cc
index 22b8cca..a31c08b 100644
--- a/runtime/arch/stub_test.cc
+++ b/runtime/arch/stub_test.cc
@@ -258,7 +258,7 @@
           "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
           "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
           "memory");  // clobber.
-#elif defined(__x86_64__)
+#elif defined(__x86_64__) && !defined(__APPLE__)
     // Note: Uses the native convention
     // TODO: Set the thread?
     __asm__ __volatile__(
@@ -483,7 +483,7 @@
           "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23",
           "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
           "memory");  // clobber.
-#elif defined(__x86_64__)
+#elif defined(__x86_64__) && !defined(__APPLE__)
     // Note: Uses the native convention
     // TODO: Set the thread?
     __asm__ __volatile__(
@@ -518,7 +518,7 @@
   // Method with 32b arg0, 64b arg1
   size_t Invoke3UWithReferrer(size_t arg0, uint64_t arg1, uintptr_t code, Thread* self,
                               mirror::ArtMethod* referrer) {
-#if defined(__x86_64__) || defined(__aarch64__)
+#if (defined(__x86_64__) && !defined(__APPLE__)) || defined(__aarch64__)
     // Just pass through.
     return Invoke3WithReferrer(arg0, arg1, 0U, code, self, referrer);
 #else
@@ -533,7 +533,7 @@
   // Method with 32b arg0, 32b arg1, 64b arg2
   size_t Invoke3UUWithReferrer(uint32_t arg0, uint32_t arg1, uint64_t arg2, uintptr_t code,
                                Thread* self, mirror::ArtMethod* referrer) {
-#if defined(__x86_64__) || defined(__aarch64__)
+#if (defined(__x86_64__) && !defined(__APPLE__)) || defined(__aarch64__)
     // Just pass through.
     return Invoke3WithReferrer(arg0, arg1, arg2, code, self, referrer);
 #else
@@ -547,12 +547,12 @@
 };
 
 
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_memcpy(void);
 #endif
 
 TEST_F(StubTest, Memcpy) {
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__APPLE__))
   Thread* self = Thread::Current();
 
   uint32_t orig[20];
@@ -588,12 +588,12 @@
 #endif
 }
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_lock_object(void);
 #endif
 
 TEST_F(StubTest, LockObject) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   static constexpr size_t kThinLockLoops = 100;
 
   Thread* self = Thread::Current();
@@ -664,14 +664,14 @@
 };
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_lock_object(void);
 extern "C" void art_quick_unlock_object(void);
 #endif
 
 // NO_THREAD_SAFETY_ANALYSIS as we do not want to grab exclusive mutator lock for MonitorInfo.
 static void TestUnlockObject(StubTest* test) NO_THREAD_SAFETY_ANALYSIS {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   static constexpr size_t kThinLockLoops = 100;
 
   Thread* self = Thread::Current();
@@ -817,12 +817,12 @@
   TestUnlockObject(this);
 }
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_check_cast(void);
 #endif
 
 TEST_F(StubTest, CheckCast) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   Thread* self = Thread::Current();
   // Find some classes.
   ScopedObjectAccess soa(self);
@@ -867,7 +867,7 @@
 }
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_aput_obj_with_null_and_bound_check(void);
 // Do not check non-checked ones, we'd need handlers and stuff...
 #endif
@@ -875,7 +875,7 @@
 TEST_F(StubTest, APutObj) {
   TEST_DISABLED_FOR_HEAP_REFERENCE_POISONING();
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   Thread* self = Thread::Current();
   // Create an object
   ScopedObjectAccess soa(self);
@@ -1003,7 +1003,7 @@
 TEST_F(StubTest, AllocObject) {
   TEST_DISABLED_FOR_HEAP_REFERENCE_POISONING();
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   // TODO: Check the "Unresolved" allocation stubs
 
   Thread* self = Thread::Current();
@@ -1125,7 +1125,7 @@
 TEST_F(StubTest, AllocObjectArray) {
   TEST_DISABLED_FOR_HEAP_REFERENCE_POISONING();
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   // TODO: Check the "Unresolved" allocation stubs
 
   Thread* self = Thread::Current();
@@ -1204,14 +1204,14 @@
 }
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_string_compareto(void);
 #endif
 
 TEST_F(StubTest, StringCompareTo) {
   TEST_DISABLED_FOR_HEAP_REFERENCE_POISONING();
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   // TODO: Check the "Unresolved" allocation stubs
 
   Thread* self = Thread::Current();
@@ -1301,7 +1301,7 @@
 }
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_set32_static(void);
 extern "C" void art_quick_get32_static(void);
 #endif
@@ -1309,7 +1309,7 @@
 static void GetSet32Static(Handle<mirror::Object>* obj, Handle<mirror::ArtField>* f, Thread* self,
                            mirror::ArtMethod* referrer, StubTest* test)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   constexpr size_t num_values = 7;
   uint32_t values[num_values] = { 0, 1, 2, 255, 32768, 1000000, 0xFFFFFFFF };
 
@@ -1337,7 +1337,7 @@
 }
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_set32_instance(void);
 extern "C" void art_quick_get32_instance(void);
 #endif
@@ -1345,7 +1345,7 @@
 static void GetSet32Instance(Handle<mirror::Object>* obj, Handle<mirror::ArtField>* f,
                              Thread* self, mirror::ArtMethod* referrer, StubTest* test)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   constexpr size_t num_values = 7;
   uint32_t values[num_values] = { 0, 1, 2, 255, 32768, 1000000, 0xFFFFFFFF };
 
@@ -1379,7 +1379,7 @@
 }
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_set_obj_static(void);
 extern "C" void art_quick_get_obj_static(void);
 
@@ -1406,7 +1406,7 @@
 static void GetSetObjStatic(Handle<mirror::Object>* obj, Handle<mirror::ArtField>* f, Thread* self,
                             mirror::ArtMethod* referrer, StubTest* test)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   set_and_check_static((*f)->GetDexFieldIndex(), nullptr, self, referrer, test);
 
   // Allocate a string object for simplicity.
@@ -1422,7 +1422,7 @@
 }
 
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_set_obj_instance(void);
 extern "C" void art_quick_get_obj_instance(void);
 
@@ -1453,7 +1453,7 @@
 static void GetSetObjInstance(Handle<mirror::Object>* obj, Handle<mirror::ArtField>* f,
                               Thread* self, mirror::ArtMethod* referrer, StubTest* test)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   set_and_check_instance(f, obj->Get(), nullptr, self, referrer, test);
 
   // Allocate a string object for simplicity.
@@ -1471,7 +1471,7 @@
 
 // TODO: Complete these tests for 32b architectures.
 
-#if defined(__x86_64__) || defined(__aarch64__)
+#if (defined(__x86_64__) && !defined(__APPLE__)) || defined(__aarch64__)
 extern "C" void art_quick_set64_static(void);
 extern "C" void art_quick_get64_static(void);
 #endif
@@ -1479,7 +1479,7 @@
 static void GetSet64Static(Handle<mirror::Object>* obj, Handle<mirror::ArtField>* f, Thread* self,
                            mirror::ArtMethod* referrer, StubTest* test)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(__x86_64__) || defined(__aarch64__)
+#if (defined(__x86_64__) && !defined(__APPLE__)) || defined(__aarch64__)
   constexpr size_t num_values = 8;
   uint64_t values[num_values] = { 0, 1, 2, 255, 32768, 1000000, 0xFFFFFFFF, 0xFFFFFFFFFFFF };
 
@@ -1506,7 +1506,7 @@
 }
 
 
-#if defined(__x86_64__) || defined(__aarch64__)
+#if (defined(__x86_64__) && !defined(__APPLE__)) || defined(__aarch64__)
 extern "C" void art_quick_set64_instance(void);
 extern "C" void art_quick_get64_instance(void);
 #endif
@@ -1514,7 +1514,7 @@
 static void GetSet64Instance(Handle<mirror::Object>* obj, Handle<mirror::ArtField>* f,
                              Thread* self, mirror::ArtMethod* referrer, StubTest* test)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(__x86_64__) || defined(__aarch64__)
+#if (defined(__x86_64__) && !defined(__APPLE__)) || defined(__aarch64__)
   constexpr size_t num_values = 8;
   uint64_t values[num_values] = { 0, 1, 2, 255, 32768, 1000000, 0xFFFFFFFF, 0xFFFFFFFFFFFF };
 
@@ -1678,12 +1678,12 @@
   TestFields(self, this, Primitive::Type::kPrimLong);
 }
 
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
 extern "C" void art_quick_imt_conflict_trampoline(void);
 #endif
 
 TEST_F(StubTest, IMT) {
-#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || defined(__x86_64__)
+#if defined(__i386__) || defined(__arm__) || defined(__aarch64__) || (defined(__x86_64__) && !defined(__APPLE__))
   TEST_DISABLED_FOR_HEAP_REFERENCE_POISONING();
 
   Thread* self = Thread::Current();
diff --git a/runtime/arch/x86_64/asm_support_x86_64.S b/runtime/arch/x86_64/asm_support_x86_64.S
index 34c8b82..d3cd4df 100644
--- a/runtime/arch/x86_64/asm_support_x86_64.S
+++ b/runtime/arch/x86_64/asm_support_x86_64.S
@@ -19,7 +19,7 @@
 
 #include "asm_support_x86_64.h"
 
-#if defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5)
+#if defined(__APPLE__) || (defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5))
     // Clang's as(1) doesn't let you name macro parameters prior to 3.5.
     #define MACRO0(macro_name) .macro macro_name
     #define MACRO1(macro_name, macro_arg1) .macro macro_name
@@ -27,13 +27,12 @@
     #define MACRO3(macro_name, macro_arg1, macro_args2, macro_args3) .macro macro_name
     #define END_MACRO .endmacro
 
-    // Clang's as(1) uses $0, $1, and so on for macro arguments prior to 3.5.
+    // Clang's as(1) uses $0, $1, and so on for macro arguments.
+    #define RAW_VAR(name,index) $index
     #define VAR(name,index) SYMBOL($index)
-    #define PLT_VAR(name, index) SYMBOL($index)@PLT
+    #define PLT_VAR(name, index) PLT_SYMBOL($index)
     #define REG_VAR(name,index) %$index
     #define CALL_MACRO(name,index) $index
-    #define FUNCTION_TYPE(name,index) .type $index, @function
-    #define SIZE(name,index) .size $index, .-$index
 
     //  The use of $x for arguments mean that literals need to be represented with $$x in macros.
     #define LITERAL(value) $value
@@ -52,17 +51,27 @@
     // no special meaning to $, so literals are still just $x. The use of altmacro means % is a
     // special character meaning care needs to be taken when passing registers as macro arguments.
     .altmacro
+    #define RAW_VAR(name,index) name&
     #define VAR(name,index) name&
     #define PLT_VAR(name, index) name&@PLT
     #define REG_VAR(name,index) %name
     #define CALL_MACRO(name,index) name&
-    #define FUNCTION_TYPE(name,index) .type name&, @function
-    #define SIZE(name,index) .size name, .-name
 
     #define LITERAL(value) $value
     #define MACRO_LITERAL(value) $value
 #endif
 
+#if defined(__APPLE__)
+    #define FUNCTION_TYPE(name,index)
+    #define SIZE(name,index)
+#elif defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5)
+    #define FUNCTION_TYPE(name,index) .type $index, @function
+    #define SIZE(name,index) .size $index, .-$index
+#else
+    #define FUNCTION_TYPE(name,index) .type name&, @function
+    #define SIZE(name,index) .size name, .-name
+#endif
+
     // CFI support.
 #if !defined(__APPLE__)
     #define CFI_STARTPROC .cfi_startproc
@@ -86,9 +95,14 @@
     // Symbols.
 #if !defined(__APPLE__)
     #define SYMBOL(name) name
-    #define PLT_SYMBOL(name) name ## @PLT
+    #if defined(__clang__) && (__clang_major__ < 4) && (__clang_minor__ < 5)
+        // TODO: Disabled for old clang 3.3, this leads to text relocations and there should be a
+        // better fix.
+        #define PLT_SYMBOL(name) name // ## @PLT
+    #else
+        #define PLT_SYMBOL(name) name ## @PLT
+    #endif
 #else
-    // Mac OS' symbols have an _ prefix.
     #define SYMBOL(name) _ ## name
     #define PLT_SYMBOL(name) _ ## name
 #endif
@@ -103,8 +117,6 @@
     .globl VAR(c_name, 0)
     ALIGN_FUNCTION_ENTRY
 VAR(c_name, 0):
-    // Have a local entrypoint that's not globl
-VAR(c_name, 0)_local:
     CFI_STARTPROC
     // Ensure we get a sane starting CFA.
     CFI_DEF_CFA(rsp, 8)
diff --git a/runtime/arch/x86_64/context_x86_64.cc b/runtime/arch/x86_64/context_x86_64.cc
index 0ccbd27..e1f47ee 100644
--- a/runtime/arch/x86_64/context_x86_64.cc
+++ b/runtime/arch/x86_64/context_x86_64.cc
@@ -59,8 +59,8 @@
     size_t j = 2;  // Offset j to skip return address spill.
     for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
       if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
-        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
-                                        frame_info.FrameSizeInBytes());
+        fprs_[i] = reinterpret_cast<uint64_t*>(
+            fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_info.FrameSizeInBytes()));
         j++;
       }
     }
@@ -93,7 +93,7 @@
 
 bool X86_64Context::SetFPR(uint32_t reg, uintptr_t value) {
   CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
-  CHECK_NE(fprs_[reg], &gZero);
+  CHECK_NE(fprs_[reg], reinterpret_cast<const uint64_t*>(&gZero));
   if (fprs_[reg] != nullptr) {
     *fprs_[reg] = value;
     return true;
diff --git a/runtime/arch/x86_64/entrypoints_init_x86_64.cc b/runtime/arch/x86_64/entrypoints_init_x86_64.cc
index 92aabee..b6f51f7 100644
--- a/runtime/arch/x86_64/entrypoints_init_x86_64.cc
+++ b/runtime/arch/x86_64/entrypoints_init_x86_64.cc
@@ -112,6 +112,9 @@
 
 void InitEntryPoints(InterpreterEntryPoints* ipoints, JniEntryPoints* jpoints,
                      PortableEntryPoints* ppoints, QuickEntryPoints* qpoints) {
+#if defined(__APPLE__)
+  UNIMPLEMENTED(FATAL);
+#else
   // Interpreter
   ipoints->pInterpreterToInterpreterBridge = artInterpreterToInterpreterBridge;
   ipoints->pInterpreterToCompiledCodeBridge = artInterpreterToCompiledCodeBridge;
@@ -216,6 +219,7 @@
   qpoints->pThrowNoSuchMethod = art_quick_throw_no_such_method;
   qpoints->pThrowNullPointer = art_quick_throw_null_pointer_exception;
   qpoints->pThrowStackOverflow = art_quick_throw_stack_overflow;
+#endif  // __APPLE__
 };
 
 }  // namespace art
diff --git a/runtime/arch/x86_64/quick_entrypoints_x86_64.S b/runtime/arch/x86_64/quick_entrypoints_x86_64.S
index c9220c8..668fb88 100644
--- a/runtime/arch/x86_64/quick_entrypoints_x86_64.S
+++ b/runtime/arch/x86_64/quick_entrypoints_x86_64.S
@@ -23,6 +23,10 @@
      * Runtime::CreateCalleeSaveMethod(kSaveAll)
      */
 MACRO0(SETUP_SAVE_ALL_CALLEE_SAVE_FRAME)
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     // R10 := Runtime::Current()
     movq _ZN3art7Runtime9instance_E@GOTPCREL(%rip), %r10
     movq (%r10), %r10
@@ -45,6 +49,7 @@
 #if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 6*8 + 8 + 8)
 #error "SAVE_ALL_CALLEE_SAVE_FRAME(X86_64) size not as expected."
 #endif
+#endif  // __APPLE__
 END_MACRO
 
     /*
@@ -52,6 +57,10 @@
      * Runtime::CreateCalleeSaveMethod(kRefsOnly)
      */
 MACRO0(SETUP_REF_ONLY_CALLEE_SAVE_FRAME)
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     // R10 := Runtime::Current()
     movq _ZN3art7Runtime9instance_E@GOTPCREL(%rip), %r10
     movq (%r10), %r10
@@ -74,6 +83,7 @@
 #if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 6*8 + 8 + 8)
 #error "REFS_ONLY_CALLEE_SAVE_FRAME(X86_64) size not as expected."
 #endif
+#endif  // __APPLE__
 END_MACRO
 
 MACRO0(RESTORE_REF_ONLY_CALLEE_SAVE_FRAME)
@@ -93,6 +103,10 @@
      * Runtime::CreateCalleeSaveMethod(kRefsAndArgs)
      */
 MACRO0(SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME)
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     // R10 := Runtime::Current()
     movq _ZN3art7Runtime9instance_E@GOTPCREL(%rip), %r10
     movq (%r10), %r10
@@ -130,6 +144,7 @@
 #if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 11*8 + 80 + 8)
 #error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(X86_64) size not as expected."
 #endif
+#endif  // __APPLE__
 END_MACRO
 
 MACRO0(RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME)
@@ -366,6 +381,10 @@
      *   r9 = char* shorty
      */
 DEFINE_FUNCTION art_quick_invoke_stub
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     // Set up argument XMM registers.
     leaq 1(%r9), %r10             // R10 := shorty + 1  ; ie skip return arg character.
     leaq 4(%rsi), %r11            // R11 := arg_array + 4 ; ie skip this pointer.
@@ -431,6 +450,7 @@
 .Lreturn_float_quick:
     movss %xmm0, (%r8)           // Store the floating point result.
     ret
+#endif  // __APPLE__
 END_FUNCTION art_quick_invoke_stub
 
     /*
@@ -445,6 +465,10 @@
      *   r9 = char* shorty
      */
 DEFINE_FUNCTION art_quick_invoke_static_stub
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     // Set up argument XMM registers.
     leaq 1(%r9), %r10             // R10 := shorty + 1  ; ie skip return arg character
     movq %rsi, %r11               // R11 := arg_array
@@ -509,6 +533,7 @@
 .Lreturn_float_quick2:
     movss %xmm0, (%r8)           // Store the floating point result.
     ret
+#endif  // __APPLE__
 END_FUNCTION art_quick_invoke_static_stub
 
 MACRO3(NO_ARG_DOWNCALL, c_name, cxx_name, return_macro)
@@ -559,6 +584,45 @@
     END_FUNCTION VAR(c_name, 0)
 END_MACRO
 
+MACRO3(ONE_ARG_REF_DOWNCALL, c_name, cxx_name, return_macro)
+    DEFINE_FUNCTION VAR(c_name, 0)
+    movl 8(%rsp), %esi                 // pass referrer
+    SETUP_REF_ONLY_CALLEE_SAVE_FRAME
+                                       // arg0 is in rdi
+    movq %gs:THREAD_SELF_OFFSET, %rdx  // pass Thread::Current()
+    movq %rsp, %rcx                    // pass SP
+    call PLT_VAR(cxx_name, 1)          // cxx_name(arg0, referrer, Thread*, SP)
+    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME // restore frame up to return address
+    CALL_MACRO(return_macro, 2)
+    END_FUNCTION VAR(c_name, 0)
+END_MACRO
+
+MACRO3(TWO_ARG_REF_DOWNCALL, c_name, cxx_name, return_macro)
+    DEFINE_FUNCTION VAR(c_name, 0)
+    movl 8(%rsp), %edx                 // pass referrer
+    SETUP_REF_ONLY_CALLEE_SAVE_FRAME
+                                       // arg0 and arg1 are in rdi/rsi
+    movq %gs:THREAD_SELF_OFFSET, %rcx  // pass Thread::Current()
+    movq %rsp, %r8                     // pass SP
+    call PLT_VAR(cxx_name, 1)          // (arg0, arg1, referrer, Thread*, SP)
+    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME // restore frame up to return address
+    CALL_MACRO(return_macro, 2)
+    END_FUNCTION VAR(c_name, 0)
+END_MACRO
+
+MACRO3(THREE_ARG_REF_DOWNCALL, c_name, cxx_name, return_macro)
+    DEFINE_FUNCTION VAR(c_name, 0)
+    movl 8(%rsp), %ecx                 // pass referrer
+    SETUP_REF_ONLY_CALLEE_SAVE_FRAME
+                                       // arg0, arg1, and arg2 are in rdi/rsi/rdx
+    movq %gs:THREAD_SELF_OFFSET, %r8    // pass Thread::Current()
+    movq %rsp, %r9                     // pass SP
+    call PLT_VAR(cxx_name, 1)          // cxx_name(arg0, arg1, arg2, referrer, Thread*, SP)
+    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME // restore frame up to return address
+    CALL_MACRO(return_macro, 2)        // return or deliver exception
+    END_FUNCTION VAR(c_name, 0)
+END_MACRO
+
 MACRO0(RETURN_IF_RESULT_IS_NON_ZERO)
     testq %rax, %rax               // rax == 0 ?
     jz  1f                         // if rax == 0 goto 1
@@ -783,14 +847,23 @@
      * rdi(edi) = array, rsi(esi) = index, rdx(edx) = value
      */
 DEFINE_FUNCTION art_quick_aput_obj_with_null_and_bound_check
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     testl %edi, %edi
 //  testq %rdi, %rdi
     jnz art_quick_aput_obj_with_bound_check_local
     jmp art_quick_throw_null_pointer_exception_local
+#endif  // __APPLE__
 END_FUNCTION art_quick_aput_obj_with_null_and_bound_check
 
 
 DEFINE_FUNCTION art_quick_aput_obj_with_bound_check
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     movl ARRAY_LENGTH_OFFSET(%edi), %ecx
 //  movl ARRAY_LENGTH_OFFSET(%rdi), %ecx      // This zero-extends, so value(%rcx)=value(%ecx)
     cmpl %ecx, %esi
@@ -800,6 +873,7 @@
     mov %ecx, %esi
 //  mov %rcx, %rsi
     jmp art_quick_throw_array_bounds_local
+#endif  // __APPLE__
 END_FUNCTION art_quick_aput_obj_with_bound_check
 
 
@@ -894,47 +968,6 @@
 UNIMPLEMENTED art_quick_lshr
 UNIMPLEMENTED art_quick_lushr
 
-
-MACRO3(ONE_ARG_REF_DOWNCALL, c_name, cxx_name, return_macro)
-    DEFINE_FUNCTION VAR(c_name, 0)
-    movl 8(%rsp), %esi                 // pass referrer
-    SETUP_REF_ONLY_CALLEE_SAVE_FRAME
-                                       // arg0 is in rdi
-    movq %gs:THREAD_SELF_OFFSET, %rdx  // pass Thread::Current()
-    movq %rsp, %rcx                    // pass SP
-    call PLT_VAR(cxx_name, 1)          // cxx_name(arg0, referrer, Thread*, SP)
-    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME // restore frame up to return address
-    CALL_MACRO(return_macro, 2)
-    END_FUNCTION VAR(c_name, 0)
-END_MACRO
-
-MACRO3(TWO_ARG_REF_DOWNCALL, c_name, cxx_name, return_macro)
-    DEFINE_FUNCTION VAR(c_name, 0)
-    movl 8(%rsp), %edx                 // pass referrer
-    SETUP_REF_ONLY_CALLEE_SAVE_FRAME
-                                       // arg0 and arg1 are in rdi/rsi
-    movq %gs:THREAD_SELF_OFFSET, %rcx  // pass Thread::Current()
-    movq %rsp, %r8                     // pass SP
-    call PLT_VAR(cxx_name, 1)          // (arg0, arg1, referrer, Thread*, SP)
-    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME // restore frame up to return address
-    CALL_MACRO(return_macro, 2)
-    END_FUNCTION VAR(c_name, 0)
-END_MACRO
-
-MACRO3(THREE_ARG_REF_DOWNCALL, c_name, cxx_name, return_macro)
-    DEFINE_FUNCTION VAR(c_name, 0)
-    movl 8(%rsp), %ecx                 // pass referrer
-    SETUP_REF_ONLY_CALLEE_SAVE_FRAME
-                                       // arg0, arg1, and arg2 are in rdi/rsi/rdx
-    movq %gs:THREAD_SELF_OFFSET, %r8    // pass Thread::Current()
-    movq %rsp, %r9                     // pass SP
-    call PLT_VAR(cxx_name, 1)          // cxx_name(arg0, arg1, arg2, referrer, Thread*, SP)
-    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME // restore frame up to return address
-    CALL_MACRO(return_macro, 2)        // return or deliver exception
-    END_FUNCTION VAR(c_name, 0)
-END_MACRO
-
-
 THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_EAX_ZERO
 THREE_ARG_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_EAX_ZERO
 THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_EAX_ZERO
@@ -1006,10 +1039,15 @@
      * rax is a hidden argument that holds the target method's dex method index.
      */
 DEFINE_FUNCTION art_quick_imt_conflict_trampoline
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     movl 8(%rsp), %edi            // load caller Method*
     movl METHOD_DEX_CACHE_METHODS_OFFSET(%rdi), %edi  // load dex_cache_resolved_methods
     movl OBJECT_ARRAY_DATA_OFFSET(%rdi, %rax, 4), %edi  // load the target method
     jmp art_quick_invoke_interface_trampoline_local
+#endif  // __APPLE__
 END_FUNCTION art_quick_imt_conflict_trampoline
 
 DEFINE_FUNCTION art_quick_resolution_trampoline
@@ -1294,6 +1332,10 @@
      * Routine that intercepts method calls and returns.
      */
 DEFINE_FUNCTION art_quick_instrumentation_entry
+#if defined(__APPLE__)
+    int3
+    int3
+#else
     SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
 
     movq %rdi, %r12               // Preserve method pointer in a callee-save.
@@ -1313,6 +1355,7 @@
     RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
 
     jmp *%rax                     // Tail call to intended method.
+#endif  // __APPLE__
 END_FUNCTION art_quick_instrumentation_entry
 
 DEFINE_FUNCTION art_quick_instrumentation_exit
diff --git a/runtime/arch/x86_64/thread_x86_64.cc b/runtime/arch/x86_64/thread_x86_64.cc
index b7a5c43..6dff2b4 100644
--- a/runtime/arch/x86_64/thread_x86_64.cc
+++ b/runtime/arch/x86_64/thread_x86_64.cc
@@ -21,18 +21,28 @@
 #include "thread-inl.h"
 #include "thread_list.h"
 
+#if defined(__linux__)
 #include <asm/prctl.h>
 #include <sys/prctl.h>
 #include <sys/syscall.h>
+#endif
 
 namespace art {
 
+#if defined(__linux__)
 static void arch_prctl(int code, void* val) {
   syscall(__NR_arch_prctl, code, val);
 }
+#endif
+
 void Thread::InitCpu() {
   MutexLock mu(nullptr, *Locks::modify_ldt_lock_);
+
+#if defined(__linux__)
   arch_prctl(ARCH_SET_GS, this);
+#else
+  UNIMPLEMENTED(FATAL) << "Need to set GS";
+#endif
 
   // Allow easy indirection back to Thread*.
   tlsPtr_.self = this;
diff --git a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
index 3301254..dde74de 100644
--- a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
@@ -154,10 +154,12 @@
 }
 
 // Generate the entrypoint functions.
+#if !defined(__APPLE__) || !defined(__LP64__)
 GENERATE_ENTRYPOINTS(_dlmalloc);
 GENERATE_ENTRYPOINTS(_rosalloc);
 GENERATE_ENTRYPOINTS(_bump_pointer);
 GENERATE_ENTRYPOINTS(_tlab);
+#endif
 
 static bool entry_points_instrumented = false;
 static gc::AllocatorType entry_points_allocator = gc::kAllocatorTypeDlMalloc;
@@ -172,6 +174,7 @@
 
 void ResetQuickAllocEntryPoints(QuickEntryPoints* qpoints) {
   switch (entry_points_allocator) {
+#if !defined(__APPLE__) || !defined(__LP64__)
     case gc::kAllocatorTypeDlMalloc: {
       SetQuickAllocEntryPoints_dlmalloc(qpoints, entry_points_instrumented);
       break;
@@ -190,6 +193,7 @@
       SetQuickAllocEntryPoints_tlab(qpoints, entry_points_instrumented);
       break;
     }
+#endif
     default: {
       LOG(FATAL) << "Unimplemented";
     }
diff --git a/runtime/mem_map.cc b/runtime/mem_map.cc
index 8d987df..1074253 100644
--- a/runtime/mem_map.cc
+++ b/runtime/mem_map.cc
@@ -72,7 +72,7 @@
 
 std::multimap<void*, MemMap*> MemMap::maps_;
 
-#if defined(__LP64__) && !defined(__x86_64__)
+#if USE_ART_LOW_4G_ALLOCATOR
 // Handling mem_map in 32b address range for 64b architectures that do not support MAP_32BIT.
 
 // The regular start of memory allocations. The first 64KB is protected by SELinux.
@@ -235,7 +235,7 @@
   // A page allocator would be a useful abstraction here, as
   // 1) It is doubtful that MAP_32BIT on x86_64 is doing the right job for us
   // 2) The linear scheme, even with simple saving of the last known position, is very crude
-#if defined(__LP64__) && !defined(__x86_64__)
+#if USE_ART_LOW_4G_ALLOCATOR
   // MAP_32BIT only available on x86_64.
   void* actual = MAP_FAILED;
   if (low_4gb && expected == nullptr) {
@@ -299,7 +299,7 @@
   }
 
 #else
-#ifdef __x86_64__
+#if defined(__LP64__)
   if (low_4gb && expected == nullptr) {
     flags |= MAP_32BIT;
   }
diff --git a/runtime/mem_map.h b/runtime/mem_map.h
index e42251c..defa6a5 100644
--- a/runtime/mem_map.h
+++ b/runtime/mem_map.h
@@ -30,6 +30,12 @@
 
 namespace art {
 
+#if defined(__LP64__) && (!defined(__x86_64__) || defined(__APPLE__))
+#define USE_ART_LOW_4G_ALLOCATOR 1
+#else
+#define USE_ART_LOW_4G_ALLOCATOR 0
+#endif
+
 #ifdef __linux__
 static constexpr bool kMadviseZeroes = true;
 #else
@@ -147,8 +153,8 @@
   size_t base_size_;  // Length of mapping. May be changed by RemapAtEnd (ie Zygote).
   int prot_;  // Protection of the map.
 
-#if defined(__LP64__) && !defined(__x86_64__)
-  static uintptr_t next_mem_pos_;   // next memory location to check for low_4g extent
+#if USE_ART_LOW_4G_ALLOCATOR
+  static uintptr_t next_mem_pos_;   // Next memory location to check for low_4g extent.
 #endif
 
   // All the non-empty MemMaps. Use a multimap as we do a reserve-and-divide (eg ElfMap::Load()).