ARM Template

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Hello. This is Dr Miller, and this is Episode 11.2 of Assembly

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today. What we're going to do is we're gonna download and install the template.

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So the template

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this template is specific to arm, so it's similar to the X 86 template. And so what we're going to do is we're gonna download install it,

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and then it will create projects for us that we can use for our coating purposes.

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So I've got a raspberry pi here that I can ssh into.

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And so

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I've cleaned it up.

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So the first thing that we're going to dio

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let's go back here

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as we were going to download the template. So that's we're gonna use the w get commands to w get space. It should be colon slash slash

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CS that you and Kate I E D u slash till day. Miller slash arm template, Doctor Dodge Easy.

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And you make sure you get all the letters to correct capitalisation. Then we'll extract it.

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We will run the fix on it, and then you will need to log out and log back in now. I've already run it so I won't have to log out. But you will have toe log out or open a new terminal in order for it to work.

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All right,

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so let's go ahead and download it.

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Okay, So it should say that it had saved our file.

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If we do an ls, we should see the arm template here.

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So now I should see a folder called Template. If I do dot, slash templates, fix

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that should fix my environment. So now is the point where you would log out and log back in,

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and then you create a new project we can use arm jen and then the name of our

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project that we want to create.

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So I'm gonna create one called Fred.

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And here it says, successfully clear it'd Fred if you try and do it again.

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Um, it says that that director already exists, so we can't recreate it

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and for doing it unless And look at our files. We see that now

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it started. We had armed template dot targets e g z womb. We extracted that. We ended up with a folder called Template.

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And now we have an additional folder called Project.

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All right, so if we go in a project again, this is where our projects will be So we can go into Fred.

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We can see

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we have our library. We have our make file, and then we have our assembly file. So go ahead and add it, Fred. I am Sam.

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So let's add some, um, A messaging. So this is similar to the example given in the first arm lecture.

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So here we're just gonna add a

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string here. We're going to tell it to a line on four byte boundaries,

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and then arm has some different directives so we can see an ask e string that ends in a zero is A S C i z.

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And then we can just type of string

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hello world with an exclamation point.

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And we can even put a slash in in here who won a new line.

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And then if we want to go ahead and print off that we can,

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um, we'll learn about these commands later LD R zero

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message.

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We'll do branch of link print

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strings that'll print a string off.

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We can also do things like move.

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Are zero the number?

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Um, let's pick a number 19

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being a new branch of link print. Didn't

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It's a lot of print off that number Natural number 19.

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And then we're all done down here. So here is our you see comments are either slash *** tricked. And then at the end, asterix slash that's multi line or a single line.

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And then, ah, regular comment is slash, slash and then everything after that and you can see syntax highlighting here shows that for me so that I can see that

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Go ahead and write and quit,

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and then we can type, make and so make we'll go ahead and run

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the assembler on,

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um, our assembly files. Afraid, I sm,

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um it also run it on our library, and then we can use DCC to compile it into a binary cold. Fred

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Additionally, we need to make sure that we save our link register.

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So I didn't say push LR

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when we're done, we need to restore that because that saves where we needed to go at the end. So pop,

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no are.

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And then additionally, we've got to create our text segment which wasn't by default set up there so dot text

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for our main program.

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So

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now if we type make,

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we can see that it should be built. And now when we run that, we can see that it prints off Hello world and then the number 19.

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So today we looked at installing the template for arm and then using it in a similar way that we use our X 86 template.

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So looking forward, we're going to talk about some of the instructions that we saw. So, for example, moving data to and from memory.

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So we were able to load our string and load the number

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19 from Variables. And so we'll look at how we do that in arm, which is going to differ a little bit than what we did in x 86.