[Pal] Build and run x86-specific tests only if on x86 arch

Pal/regression/Makefile

@@ -17,7 +17,6 @@ executables = \
 	..Bootstrap \
 	AtomicMath \
 	AttestationReport \
-	AvxDisable \
 	avl_tree_test \
 	Bootstrap \
 	Bootstrap2 \
@@ -26,8 +25,6 @@ executables = \
 	Directory \
 	Event \
 	Event2 \
-	Exception \
-	Exception2 \
 	Exit \
 	Failure \
 	File \
@@ -42,7 +39,6 @@ executables = \
 	Process2 \
 	Process3 \
 	Process4 \
-	Segment \
 	Select \
 	Semaphore \
 	SendHandle \
@@ -50,13 +46,21 @@ executables = \
 	Socket \
 	Symbols \
 	Tcp \
-	Thread \
 	Thread2 \
 	Udp \
 	Wait \
 	Yield \
 	normalize_path
 
+ifeq ($(ARCH),x86_64)
+executables += \
+        AvxDisable \
+        Exception \
+        Exception2 \
+        Segment \
+        Thread
+endif
+
 manifests = \
 	manifest \
 	AvxDisable.manifest \

Pal/regression/test_pal.py

@@ -55,6 +55,7 @@ class TC_00_BasicSet2(RegressionTestCase):
         self.assertIn('In thread 1', stderr)
         self.assertIn('Success, leave main thread', stderr)
 
+    @unittest.skipUnless(ON_X86, "x86-specific")
     def test_Exception2(self):
         _, stderr = self.run_binary(['Exception2'])
         self.assertIn('Enter Main Thread', stderr)
@@ -89,6 +90,7 @@ class TC_00_BasicSet2(RegressionTestCase):
         for i in range(100):
             self.assertIn('In process: Process4 %d ' % i, stderr)
 
+    @unittest.skipUnless(ON_X86, "x86-specific")
     def test_Segment(self):
         _, stderr = self.run_binary(['Segment'])
         self.assertIn('TLS = 0x', stderr)
@@ -323,6 +325,7 @@ class TC_10_Exception(RegressionTestCase):
             return False
         return True
 
+    @unittest.skipUnless(ON_X86, "x86-specific")
     def test_000_exception(self):
         _, stderr = self.run_binary(['Exception'])
 
@@ -570,6 +573,7 @@ class TC_20_SingleProcess(RegressionTestCase):
         self.assertIn('UDP Write 4 OK', stderr)
         self.assertIn('UDP Read 4: Hello World 2', stderr)
 
+    @unittest.skipUnless(ON_X86, "x86-specific")
     def test_500_thread(self):
         _, stderr = self.run_binary(['Thread'])