WEBVTT 1 00:01.520 --> 00:04.100 Hello and welcome to the next lesson. 2 00:04.280 --> 00:09.650 In this lesson, we are going to do a practical on the OR operation. 3 00:10.490 --> 00:19.160 The OR operation syntax is as follows: OR destination, source, and the result will be stored back into 4 00:19.160 --> 00:20.150 the destination. 5 00:21.080 --> 00:25.340 So there are these two variations that we will look at. 6 00:25.370 --> 00:28.850 First one is OR register and immediate. 7 00:29.030 --> 00:33.080 And the second one is OR register and register. 8 00:33.890 --> 00:38.450 And then for each of these two, we will be using the values from here. 9 00:38.870 --> 00:43.040 So the first value will be in the first operand, 10 00:43.040 --> 00:46.040 and the second value will be in the second operand. 11 00:46.400 --> 00:51.560 And for the register, we can choose -, -, - and so on. 12 00:51.920 --> 00:56.150 But we are just going to stick with - for this practical. 13 00:56.690 --> 00:58.160 So let's get started. 14 00:58.550 --> 01:04.010 I've already opened template 2x in my x64dbg, so, 15 01:04.010 --> 01:05.990 and I also put a breakpoint here. 16 01:06.410 --> 01:09.710 So now let's create the code that will make this happen. 17 01:10.760 --> 01:16.580 So for the first example, we are going to take - as the register. 18 01:16.730 --> 01:20.270 So we need to move this value into -. 19 01:21.080 --> 01:22.550 So let's do that now. 20 01:26.280 --> 01:27.540 And click okay. 21 01:34.240 --> 01:36.400 Right, now we run to our breakpoint. 22 01:38.810 --> 01:42.620 Step away until we reach this line. 23 01:43.250 --> 01:48.770 And notice here, it has converted the binary number into hex. 24 01:48.920 --> 01:57.170 And we can confirm by opening our calculator to check whether the 3D hex value represents this binary 25 01:57.170 --> 01:57.770 number. 26 01:58.610 --> 02:03.950 So we can go into here and key in our hex value as 3D. 27 02:05.780 --> 02:09.140 And we will see it is converted to this binary number. 28 02:11.030 --> 02:12.470 That means it is correct. 29 02:13.880 --> 02:21.200 Now the next instruction is to step over this, to let it move this 3D into -. 30 02:22.850 --> 02:24.680 3D is now in -. 31 02:25.550 --> 02:28.610 Next, we are going to perform this OR operation. 32 02:28.610 --> 02:30.080 So let's do that now. 33 02:33.500 --> 02:35.840 The immediate value will be this one here. 34 02:41.490 --> 02:42.000 And hit 35 02:42.000 --> 02:42.690 okay. 36 02:44.880 --> 02:47.430 Now we step over this to execute it. 37 02:52.260 --> 02:56.580 And we have just executed it, and the result is stored in the - register. 38 02:57.000 --> 03:04.020 So let's go to our calculator to confirm whether the result is correct. 39 03:06.780 --> 03:10.860 Make sure you set this to byte and bitwise. 40 03:11.670 --> 03:17.400 Before that, let's input by using the bin input. 41 03:18.600 --> 03:19.230 Clear. 42 03:20.580 --> 03:23.610 And then over here, we input the first value. 43 03:32.980 --> 03:37.150 Then select bitwise OR, and then 44 03:37.150 --> 03:39.130 now input the second value. 45 03:48.000 --> 03:51.780 Hit equal, and we get this value. 46 03:51.960 --> 03:53.700 And in hex, it is 3F. 47 03:54.090 --> 03:55.650 So compare it with -. 48 03:56.070 --> 03:57.990 Indeed, we get 3F. 49 03:57.990 --> 04:00.120 So it's working. 50 04:01.440 --> 04:07.350 So now let's do the next one, which is to OR register and register. 51 04:08.520 --> 04:14.400 So we're going to put this value into binary, into the register - again. 52 04:15.630 --> 04:19.020 So we can just copy this line here. 53 04:31.440 --> 04:32.730 And paste it here. 54 04:36.660 --> 04:46.770 Then you are going to put this value in the second register, and we will choose - for that register. 55 04:49.260 --> 04:53.430 So we are going to move -, 0b. 56 05:03.790 --> 05:04.150 Hit 57 05:04.150 --> 05:04.930 okay. 58 05:08.190 --> 05:11.670 And it has converted our binary number into 22. 59 05:12.660 --> 05:17.040 We can go and confirm by using our calculator 60 05:19.390 --> 05:23.620 whether or not this 22 represents this second binary number. 61 05:24.520 --> 05:25.600 Click cancel. 62 05:27.310 --> 05:30.550 Make sure it's bin again. Key in this number. 63 05:41.230 --> 05:45.070 And indeed, you look at the hex, it is indeed 64 05:45.100 --> 05:45.490 22. 65 05:47.800 --> 05:52.810 So now let's step over that. 66 05:57.600 --> 05:58.920 And step over this. 67 05:59.280 --> 06:03.120 So we have our two values in our registers already: 68 06:03.150 --> 06:04.470 - and -. 69 06:04.920 --> 06:06.870 The next thing to do is to OR them. 70 06:08.490 --> 06:13.260 So now we're going to OR -, -. 71 06:14.280 --> 06:15.150 Hit okay. 72 06:17.950 --> 06:19.900 And now we're going to step over this. 73 06:22.280 --> 06:23.330 And we get 3F. 74 06:23.870 --> 06:26.960 So let's open our calculator and test it out. 75 06:31.410 --> 06:33.300 Clear the input first. 76 06:35.190 --> 06:37.590 So the first value is 3F. 77 06:37.980 --> 06:42.810 So we input as hex. It will be faster: 3F. 78 06:43.590 --> 06:46.290 And then we OR it with 79 06:47.960 --> 06:48.950 22. 80 06:51.250 --> 06:54.040 And we should get 3F. 81 06:54.280 --> 06:57.220 So it seems that our result is correct. 82 06:57.760 --> 07:00.520 So that's all for this video. 83 07:00.550 --> 07:02.200 Thank you for watching.