Assembly infinite loop

Question

My saga with x86 assembly continues, I'm getting into an infinite loop with this piece of code and I'm a bit puzzled.

movl $1, %ecx
movl $4, %edi

do_loop:
   cmpl %edi, %ecx
   je do_exit
   .........
   do_stuff
   .........
   incl %ecx
   jmp do_loop
do_exit:

I'm expecting a jump to do_exit: when %ecx reaches 4 since it's incremented in every iteration

Answer 1

As others have mentioned, be careful with register usage in do_stuff. And the real thing that you are looking for are calling conventions, and especially this line:

Registers EAX, ECX, and EDX are available for use in the function.

Answer 2

No debugger? Does do_stuff modify %edi? Try commenting do_stuff out.

Answer 3

I dont know if the do_exit is followed by blanks and I have no idea how you are executing the assembly code...

but try to add the following after the do_exit:

leave

ret