Go: add context api (#668)

bindings/go/unicorn/context_test.go

@@ -0,0 +1,26 @@
+package unicorn
+
+import (
+	"testing"
+)
+
+func TestContext(t *testing.T) {
+	u, err := NewUnicorn(ARCH_X86, MODE_32)
+	if err != nil {
+		t.Fatal(err)
+	}
+	u.RegWrite(X86_REG_EBP, 100)
+	ctx, err := u.ContextSave(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	u.RegWrite(X86_REG_EBP, 200)
+	err = u.ContextRestore(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	val, _ := u.RegRead(X86_REG_EBP)
+	if val != 100 {
+		t.Fatal("context restore failed")
+	}
+}