added regression test for fstcw not writing to memory

regress/fpu_mem_write.py

@@ -0,0 +1,32 @@
+#!/usr/bin/python
+from unicorn import *
+from unicorn.x86_const import *
+
+ESP = 0x2000
+PAGE_SIZE = 1 * 1024 * 1024
+
+# 	fstcw [esp]
+#	pop ecx
+CODE = b'\x9B\xD9\x3C\x24\x59'
+
+def mem_reader(addr, size):
+	tmp = mu.mem_read(addr, size)
+
+	for i in tmp:
+		print(" 0x%x" % i),
+	print("")
+
+def hook_mem_write(uc, access, address, size, value, user_data):
+	print("mem WRITE: 0x%x, data size = %u, data value = 0x%x" % (address, size, value))
+	return True
+
+mu = Uc(UC_ARCH_X86, UC_MODE_32)
+mu.mem_map(0, PAGE_SIZE)
+mu.mem_write(0, CODE)
+mu.reg_write(UC_X86_REG_ESP, ESP)
+mu.hook_add(UC_HOOK_MEM_WRITE, hook_mem_write)
+
+mu.emu_start(0x0, 0, 0, 2)
+esp = mu.reg_read(UC_X86_REG_ESP)
+print("value at ESP [0x%X]: " % esp)
+mem_reader(esp, 10)