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/high_mem.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+
+import regress
+
+from unicorn import Uc, UcError, UC_ARCH_X86, UC_MODE_64
+from unicorn.unicorn_const import UC_TLB_VIRTUAL, UC_TLB_CPU, UC_ERR_FETCH_UNMAPPED
+
+
+MAX_INTEL_INSN_SIZE = 15
+
+
+class TestMem(regress.RegressTest):
+
+    # 0x0008fffffffff000  : mappings till this point work ok
+    # 0x0010000000000000  : mappings beyond this point will fail if tlb is not set to virtual
+
+    def setUp(self):
+        self.uc = Uc(UC_ARCH_X86, UC_MODE_64)
+
+    def map_code_page(self, address, payload):
+        regress.logger.debug('attempting to map code at %#018x', address)
+
+        self.uc.mem_map(address, 0x1000)
+        self.uc.mem_write(address, payload)
+
+    def test_virt_high_mapping(self):
+        """Mapping memory at high addresses should work when TLB mode
+        is set to VIRTUAL.
+        """
+
+        base = 0x0010000000000000
+
+        self.uc.ctl_tlb_mode(UC_TLB_VIRTUAL)
+
+        for i in range(12):
+            code = base << i
+
+            self.map_code_page(code, b'\xf4')
+
+            try:
+                self.uc.emu_start(code, code + MAX_INTEL_INSN_SIZE, count=1)
+            except UcError:
+                self.fail('high mapping failed at %#018x' % code)
+
+    def test_cpu_high_mapping(self):
+        """Mapping memory at high addresses should work fail TLB mode
+        is set to CPU (default).
+        """
+
+        base = 0x0010000000000000
+
+        self.uc.ctl_tlb_mode(UC_TLB_CPU)
+
+        for i in range(12):
+            code = base << i
+
+            self.map_code_page(code, b'\xf4')
+
+            with self.assertRaises(UcError) as ex:
+                self.uc.emu_start(code, code + MAX_INTEL_INSN_SIZE, count=1)
+
+            self.assertEqual(UC_ERR_FETCH_UNMAPPED, ex.exception.errno)
+
+
+if __name__ == '__main__':
+    regress.main()