cerror.S revision 178580 
1/*	$NetBSD: cerror.S,v 1.13 2003/08/07 16:42:17 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD: head/lib/libc/mips/sys/cerror.S 178580 2008-04-26 12:08:02Z imp $");
37#include "SYS.h"
38
39#if defined(LIBC_SCCS) && !defined(lint)
40	ASMSTR("from: @(#)cerror.s	8.1 (Berkeley) 6/16/93")
41	ASMSTR("$NetBSD: cerror.S,v 1.13 2003/08/07 16:42:17 agc Exp $")
42#endif /* LIBC_SCCS and not lint */
43
44
45	/*
46	 * The __error() function is thread aware. For non-threaded
47	 * programs and the initial threaded in threaded programs,
48	 * it returns a pointer to the global errno variable.
49	 */
50	.globl  _C_LABEL(__error)
51	.type   _C_LABEL(__error),%function
52
53LEAF(__cerror)
54	.frame sp, CALLFRAME_SIZ, ra
55	PIC_PROLOGUE(__cerror, t9)
56	subu	sp, sp, CALLFRAME_SIZ
57	.mask	0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ)
58	sw	ra, CALLFRAME_RA(sp)
59	sw	v0, 12(sp)		# save errno value
60
61	la	t9, _C_LABEL(__error)	# locate address of errno
62	jalr	t9
63
64	lw	t0, 12(sp)
65	lw	ra, CALLFRAME_RA(sp)
66	sw	t0, 0(v0)		# update errno value
67	addiu	sp, sp, CALLFRAME_SIZ
68	li	v0, -1
69	li	v1, -1
70	j	ra
71END(__cerror)
72