# example of how to do a system call from assembly language 

# writes "ABC" to the screen, and also calls the exit() system call

hi:   .string "ABC"

.globl _start
_start:

      movl $4, %eax     # the write() system call, number 4 obtained
                        # from /usr/include/asm/unistd.h
      movl $1, %ebx     # 1 = file handle for stdout
      movl $hi, %ecx    # write from where
      movl $3, %edx     # write how many bytes
      int $0x80         # system call
      movl $1, %eax     # the exit() system call
      int $0x80