/ error	= execl(name, arg0, arg1, ... , 0);
/	  char *name, *arg0, ..., *argn;

.globl	_execl
.globl	cerror, _environ

_execl:
	mov	r5,-(sp)
	mov	sp,r5
	mov	4(r5),0f
	mov	r5,r0
	add	$6,r0
	mov	r0,0f+2
	mov	_environ,0f+4
	sys	0; 9f
	jmp	cerror
.data
9:
	sys	exece; 0:..; ..; ..