/*	$NetBSD: cerror.S,v 1.13 2003/08/07 16:42:17 agc Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include "SYS.h"

#if defined(LIBC_SCCS) && !defined(lint)
	ASMSTR("from: @(#)cerror.s	8.1 (Berkeley) 6/16/93")
	ASMSTR("$NetBSD: cerror.S,v 1.13 2003/08/07 16:42:17 agc Exp $")
#endif /* LIBC_SCCS and not lint */


	/*
	 * The __error() function is thread aware. For non-threaded
	 * programs and the initial threaded in threaded programs,
	 * it returns a pointer to the global errno variable.
	 */
	.globl  _C_LABEL(__error)
	.type   _C_LABEL(__error),%function

LEAF(__cerror)
	.frame sp, CALLFRAME_SIZ, ra
	PIC_PROLOGUE(__cerror, t9)
	subu	sp, sp, CALLFRAME_SIZ
	.mask	0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
	sw	ra, CALLFRAME_RA(sp)
	sw	v0, 12(sp)		# save errno value

	la	t9, _C_LABEL(__error)	# locate address of errno
	jalr	t9

	lw	t0, 12(sp)
	lw	ra, CALLFRAME_RA(sp)
	sw	t0, 0(v0)		# update errno value
	addiu	sp, sp, CALLFRAME_SIZ
	li	v0, -1
	li	v1, -1
	j	ra
END(__cerror)