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    <p>You are invoking the sys_write system call. sys_write() takes three arguments, file descriptor of the output device(it should be 1 for stdout),address of the buffer where you stored the value to be printed, and the size of the data to be printed. So you have to store file descriptor in %ebx, and store address of the buffer in %ecx and size of the data in %edx. To store the file descriptor you can use the following instruction.</p> <pre><code> movl $1, %ebx // store 1 (stdout) in ebx) </code></pre> <p>To store the size of the data you can use:</p> <pre><code> movl $1, %edx // size is 1 byte </code></pre> <p>Now, you have to store the address of the buffer, you need to put your data in the memory some where and need to store the address of the memory in %ecx. Assume that you want store the data in the stack it self, then you can do like this:</p> <pre><code> subl $4, %esp // get 4 bytes of memory in the stack movl $65, (%esp) // store data in the memory where esp points to movl %esp, %ecx // store address of the data in the ecx </code></pre> <p>Now you can issue the int 0x80.</p> <pre><code> movl $04, %eax // store syscall number in eax int $0x80 // issue the trap interrupt </code></pre> <p>As a whole you can write the following code:</p> <pre><code> movl $1, %ebx subl $0x4, %esp movl $64, (%esp) start_loop: movl (%esp), %eax addl $1, %eax movl %eax, (%esp) movl %esp, %ecx movl $1, %edx movl $0x04, %eax int $0x80 movl (%esp), %eax cmpl $126, %eax jle start_loop addl $0x4, %esp </code></pre> <p>See Linux System Calls Part2 at <a href="http://www.rulingminds.com/syscallspart2" rel="nofollow">http://www.rulingminds.com/syscallspart2</a> to know more about registers and system calls usage.</p>
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    1. CO+1 BTW you need a newline before the code blocks for them to show up properly.
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