glibc/sysdeps/unix/bsd/osf/alpha/start.S

/* Copyright (C) 1993, 1995 Free Software Foundation, Inc.
   Contributed by Brendan Kehoe (brendan@zen.org).

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <sysdep.h>

#if 0
.sdata
.globl STARTFRM
STARTFRM = 0
#endif

.text
ENTRY(__start)
	lda	sp, -16(sp)
	stq	zero, 8(sp)

	/* This branch puts the address of the current insn in t0. */
	br	t0, 10f
10:
	/* We set the GP register by using the address of the ldgp */
	/* (what we just put into t0). */
	ldgp	gp, 0(t0)

	/* get argc */
	ldl	a0, 16(sp)

	/* get argv */
	lda	a1, 24(sp)

	/* move ahead to envp */
	s8addq	a0, a1, a2
	addq	a2, 0x8, a2

	/* Store in environ. */
	stq	a2, environ

	/* Clear out errno. */
/*	ldgp	gp, 0(t12) */
	stl	zero, errno

	/* Call main. */
	jsr	ra, main
	ldgp	gp, 0(ra)

	mov	v0, a0

	jsr	ra, exit
	ldgp	gp, 0(ra)

	.end __start