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8921117
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2012-01-19T04:45:02.487
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2012-01-19T06:09:40.357
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2012-01-19T06:09:40.357
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It doesn't look like you have the whole function, but here's a breakdown of what's here: These 3 instructions set up your stack frame: <pre><code>0x080486a8 <myFunction+0>: push %ebp 0x080486a9 <myFunction+1>: mov %esp,%ebp 0x080486ab <myFunction+3>: sub $0x1c,%esp </code></pre> I'm not sure what this is for: <pre><code>0x080486ae <myFunction+6>: call 0x8048418 <mcount@plt> </code></pre> This is i and sum getting initialized to 0 (the are stored on the stack): <pre><code>0x080486b3 <myFunction+11>: movl $0x0,-0x4(%ebp) 0x080486ba <myFunction+18>: movl $0x0,-0xc(%ebp) </code></pre> This is the beginning of the outer for loop. Typically, a loop in assembly starts by jumping to the end. The end in this case is past the end of your assembly listing. <pre><code>0x080486c1 <myFunction+25>: jmp 0x8048713 <myFunction+107> </code></pre> This is j getting initialized to 0. It's done here because it has to be reset every time the outer for loop runs. <pre><code>0x080486c3 <myFunction+27>: movl $0x0,-0x8(%ebp) </code></pre> This is the beginning of the inner for loop. <pre><code>0x080486ca <myFunction+34>: jmp 0x8048707 <myFunction+95> </code></pre> This indexes array by i*2 by doing pointer arithmetic on the address of array. First it puts i into eax, then left shifts it 3 (multiplying it by 8). This is an optimization of the *2 as well as accounting for the size of elements of array (4). Finally it adds this to the address of array, storing the result in eax. <pre><code>0x080486cc <myFunction+36>: mov -0xc(%ebp),%eax 0x080486cf <myFunction+39>: shl $0x3,%eax 0x080486d2 <myFunction+42>: add 0xc(%ebp),%eax </code></pre> This takes the value pointed to by address calculated above and stores it in edx. In this dialect of assembly x(y) means *(y+x) <pre><code>0x080486d5 <myFunction+45>: mov (%eax),%edx </code></pre> This calculates array[j] in a similar fashion, storing the result in eax this time: <pre><code>0x080486d7 <myFunction+47>: mov -0x8(%ebp),%eax 0x080486da <myFunction+50>: shl $0x2,%eax 0x080486dd <myFunction+53>: add 0xc(%ebp),%eax 0x080486e0 <myFunction+56>: mov (%eax),%eax </code></pre> This checks the two calculations above to see if they are equal: <pre><code>0x080486e2 <myFunction+58>: cmp %eax,%edx </code></pre> If the check doesn't pass (if they are not equal), skip the inside of the if. (This jumps past the end of your listing) jne means "jump if not equal" <pre><code>0x080486e4 <myFunction+60>: jne 0x8048703 <myFunction+91> </code></pre> These instructions load the arguments of mySumFunction into the proper places: <pre><code>0x080486e6 <myFunction+62>: movl $0x6,0x8(%esp) 0x080486ee <myFunction+70>: mov 0xc(%ebp),%eax 0x080486f1 <myFunction+73>: mov %eax,0x4(%esp) </code></pre> If the listing is cut off here, but hopefully this gives you a good general idea. 
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1. POHow does this dissaseble output correlate to the function source?
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1. COyou're a life saver. i can't believe i was missing part of the code. thanks!
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2. CO@splat: this matches my analysis too. I think `mcount@plt` is a c runtime library profiling function.
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