/*	$OpenBSD: cerror.S,v 1.5 2013/08/26 21:38:08 miod Exp $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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 "DEFS.h"

	.globl	_C_LABEL(__errno)

/*
 * long long __cerror(register_t errcode)
 * stores `errcode' into the current thread's errno variable, and returns
 * -1LL.
 */

ASENTRY(__cerror)
	/* if %r26 has been initialized, don't bother setting up a frame */
	bcnd	ne0, %r26, has_r26

	subu	%r31,%r31,16
	st	%r25,%r0,%r31
	st	%r1,%r31,4

#ifdef __PIC__
	bsr.n	_C_LABEL(__errno)#plt
#else
	bsr.n	_C_LABEL(__errno)
#endif
	 or	%r25,%r0,%r2
	or	%r26,%r0,%r2	/* save errno ptr */
	or	%r2,%r0,%r25	/* and restore errno value */

	ld	%r1,%r31,4
	ld	%r25,%r0,%r31
	addu	%r31,%r31,16

has_r26:
	st	%r2,%r0,%r26
	subu	%r2,%r0,1
	jmp.n	%r1
	 or	%r3, %r0, %r2
END(__cerror)