attempt to read argc

x.s

; attempt to read argc
;
; Build and run on 32-bit Linux:
;   $ nasm -f elf x.s
;   $ gcc -Wall -s -nostdlib x.o -o x
;   $ ./x;  echo $?
;   77  # expected: 1
;   $ ./x abc;  echo $?
;   73  # expected: 2
;   $ ./x abc def;  echo $?
;   69  # expected: 3
;
; The return values change from binary to binary (ASLR). But the difference is
; always the total size of argv (in bytes, including nulls)

BITS 32
GLOBAL _start
SECTION .text
_start:
  mov ebx, [esp+4]
  mov eax, 1
  int 0x80