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POUsing Assembly On Mac
 

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    <p>I'm using a MacBook Pro with an Intel Core 2 Duo processor at 2.53 GHz, but I was told Mac users must follow AT&amp;T syntax (which adds to my confusion since I am running Intel) and x86 (not sure what this means exactly).</p> <p>So I need to get into assembly but am finding it very hard to even begin. Searches online show assembly code that varies greatly in syntax and I can't find any resources that explain basic assembly how-tos. I keep reading about registers and a stack but don't understand how to look at this. Can anyone explain/point me in the right direction? Take, for example, this code which is the only code I found to work:</p> <pre><code>.data _mystring: .ascii "Hello World\n\0" #C expects strings to terminate with a 0. .text .globl _foo _foo: push %ebp mov %esp,%ebp pushl $_mystring call _myprint add $4,%esp pop %ebp ret </code></pre> <p>Very simple but what is it saying? I am having a confusing time understanding how this code does what it does. I know Java, PHP, and C, among other languages, but this, the steps and syntax of it, isn't clear to me. Here's the main file to go with it:</p> <pre><code>#include &lt;stdio.h&gt; void foo(); void myprint(char *s) {printf("%s", s);} main() {foo();} </code></pre> <p>Also, there's this which just multiplies numbers:</p> <pre><code>.data .globl _cntr _cntr: .long 0 .globl _prod _prod: .long 0 .globl _x _x: .long 0 .globl _y _y: .long 0 .globl _mask _mask: .long 1 .globl _multiply multiply: push %ebp mov %ebp,%esp mov $0,%eax mov _x,%ebx mov _y,%edx LOOP: cmp $0,%ebx je DONE mov %ebx,%ecx and $1,%ecx cmp $1,%ecx jne LOOPC add %edx,%eax LOOPC: shr $1,%ebx shl $1,%edx jmp LOOP DONE: pop %ebp ret </code></pre> <p>and the main.c to go with it:</p> <pre><code>#include &lt;stdio.h&gt; extern int multiply(); extern int x, y; int main() { x = 34; y = 47; printf("%d * %d = %d\n", x, y, multiply()); } </code></pre> <p>And finally three small questions:</p> <blockquote> <ol> <li><p>What is the difference between <code>.s</code> and <code>.h</code> file names (I have both a <code>main.c</code> and <code>main.h</code>, which one is for what)?</p></li> <li><p>And why does assembly need a <code>main.c</code> to go with it/how does it call it?</p></li> <li><p>Can anyone recommend a good assembly IDE like Eclipse is for Java or PHP</p></li> </ol> </blockquote> <p>Thanks to whomever answers (this is actually my first post on this site), I've been trying to figure this out for a few days and every resource I have read just doesn't explain the assembly logic to me. It says what <code>.data</code> or <code>.text</code> does but only someone who knows how to "think assembly" would understand what they mean? Also, if anyone is around New York City and feels very comfortable with Assembly and C I would love some private lessons. I feel there is a lot of potential with this language and would love to learn it.</p>
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    1. USAiron Zagarella
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    1. COSee: http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html
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      1. USPaul R
    2. CO`nasm` comes with recent versions of Xcode. You can use that with Intel syntax. Wikibooks also has an [x86 Assembly book](https://en.wikibooks.org/wiki/X86_Assembly).
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      1. USJeremy W. Sherman
    3. COWhat sort of application are you planning on writing?
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      1. USDavid Heffernan
 

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