Revamp Python regression tests suite (#2022)

* Fix Python regression test suite (partial)

* Fix Python regression test suite

* Add a test for mapping at high addresses

* Add ctl tests

tests/regress/mov_gs_eax.py

@@ -1,24 +1,34 @@
 #!/usr/bin/python
 
+import regress
+
 from unicorn import *
 from unicorn.x86_const import *
 
-import regress
+
+CODE = (
+    b'\x8e\xe8'              #  mov     gs, eax
+    b'\xb8\x01\x00\x00\x00'  #  mov     eax, 1
+)
+
+BASE = 0x1000
+
 
 class VldrPcInsn(regress.RegressTest):
 
     def runTest(self):
         uc = Uc(UC_ARCH_X86, UC_MODE_32)
-        uc.mem_map(0x1000, 0x1000)
-        # mov gs, eax; mov eax, 1
-        code = '8ee8b801000000'.decode('hex')
-        uc.mem_write(0x1000, code)
+
+        uc.mem_map(BASE, 0x1000)
+
+        uc.mem_write(BASE, CODE)
         uc.reg_write(UC_X86_REG_EAX, 0xFFFFFFFF)
 
         with self.assertRaises(UcError) as ex_ctx:
-            uc.emu_start(0x1000, 0x1000 + len(code))
+            uc.emu_start(BASE, BASE + len(CODE))
+
+        self.assertEqual(UC_ERR_EXCEPTION, ex_ctx.exception.errno)
 
-        self.assertEquals(ex_ctx.exception.errno, UC_ERR_EXCEPTION)
 
 if __name__ == '__main__':
     regress.main()