September 6, 2008 07:38pm pdt

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07.29.2008 at 05:46AM PDT, ID: 23603739

	[x] Attachment Details

Simple Linux Assembly Program

Asked by chsalvia in Assembly Programming Language

I'm trying to write my first simple assembly program using the gas assembler on Linux, with AT&T syntax.

The program is meant to simply push some characters onto the stack, and then output them to stdout. So I start by pushing 16 ASCII characters onto the stack, then I set up the registers for a system call to write(), and then I execute the system call. My assumption here is that after pushing the string onto the stack, the stack pointer (esp) will be pointing to the beginning of the string.

The program compiles and runs, but it doesn't output anything. Can someone explain why it doesn't work?Start Free Trial

         
           
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             .global _start
 
_start:
 
# push an ASCII string onto the stack
 
push	$0x0a515151
push	$0x51515151
push	$0x51515151
push	$0x51515151
 
movl	$16, %edx	# third argument: message length
movl	%esp, %ecx	# second argument: stack pointer
movl	$1, %ebx	# first argument: file handle (stdout)
movl	$4, %eax	# system call number (sys_write)
int	$0x80	
 
# exit
 
movl	$0,%ebx
movl	$1,%eax
int	$0x80

           
         

Keywords: Simple Linux Assembly Program

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20080716-EE-VQP-32 / EE_QW_2_20070628

Simple Linux Assembly Program

Asked by chsalvia in Assembly Programming Language

About this solution