cerror.S revision 217398 
1/*-
2 * Copyright (c) 2002 Peter Grehan.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26/*      $NetBSD: cerror.S,v 1.5 2000/01/27 14:58:48 kleink Exp $        */
27
28#include <machine/asm.h>
29__FBSDID("$FreeBSD: head/lib/libc/powerpc/sys/cerror.S 217398 2011-01-14 11:33:40Z kib $");
30
31#include "SYS.h"
32
33	.globl  HIDENAME(cerror)
34	.globl  CNAME(__error)
35
36	/*
37	 * The __error() function is thread aware. For non-threaded
38	 * programs and the initial threaded in threaded programs,
39	 * it returns a pointer to the global errno variable.
40	 */
41HIDENAME(cerror):
42	mflr	%r0
43	stwu	%r1,-16(%r1)		/* allocate new stack frame */
44	stw	%r0,20(%r1)		/* and save lr, r31 */
45	stw	%r31,8(%r1)
46	mr	%r31,%r3          /* stash errval in callee-saved register */
47	bl	PIC_PLT(CNAME(__error))
48	stw	%r31,0(%r3)		/* store errval into &errno */
49	lwz	%r0,20(%r1)
50	lwz	%r31,8(%r1)
51	mtlr	%r0
52	la	%r1,16(%r1)
53	li	%r3,-1
54	li	%r4,-1
55	blr				/* return to callers caller */
56
57	.section .note.GNU-stack,"",%progbits
58