xref: /freebsd/lib/libsys/powerpc/cerror.S (revision 62a52c15422470f97fc7b311d89c83f910bcc1b1)
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#include "SYS.h"
30
31	.globl  HIDENAME(cerror)
32	.globl  CNAME(__error)
33
34	/*
35	 * The __error() function is thread aware. For non-threaded
36	 * programs and the initial thread in threaded programs,
37	 * it returns a pointer to the global errno variable.
38	 */
39HIDENAME(cerror):
40	mflr	%r0
41	stwu	%r1,-20(%r1)		/* allocate new stack frame */
42	stw	%r0,24(%r1)		/* and save lr, r31 */
43	stw	%r31,12(%r1)
44#ifdef __PIC__
45	stw	%r30,8(%r1)
46	bcl	20,31,1f
471:
48	mflr	%r30
49	addis	%r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@ha
50	addi	%r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@l
51#endif
52	mr	%r31,%r3          /* stash errval in callee-saved register */
53	bl	PIC_PLT(CNAME(__error))
54	stw	%r31,0(%r3)		/* store errval into &errno */
55	lwz	%r0,24(%r1)
56	lwz	%r31,12(%r1)
57#ifdef __PIC__
58	lwz	%r30,8(%r1)
59#endif
60	mtlr	%r0
61	la	%r1,20(%r1)
62	li	%r3,-1
63	li	%r4,-1
64	blr				/* return to callers caller */
65
66	.section .note.GNU-stack,"",%progbits
67