/*-
 * Copyright (c) 2002 Peter Grehan.
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */
/*      $NetBSD: cerror.S,v 1.5 2000/01/27 14:58:48 kleink Exp $        */

#include <machine/asm.h>
#include "SYS.h"

        .globl  HIDENAME(cerror)
        .globl  CNAME(__error)

        /*
         * The __error() function is thread aware. For non-threaded
         * programs and the initial thread in threaded programs,
         * it returns a pointer to the global errno variable.
         */
HIDENAME(cerror):
        mflr    %r0
        stwu    %r1,-20(%r1)            /* allocate new stack frame */
        stw     %r0,24(%r1)             /* and save lr, r31 */
        stw     %r31,12(%r1)
#ifdef __PIC__
        stw     %r30,8(%r1)
        bcl     20,31,1f
1:
        mflr    %r30
        addis   %r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@ha
        addi    %r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@l
#endif
        mr      %r31,%r3          /* stash errval in callee-saved register */
        bl      PIC_PLT(CNAME(__error))
        stw     %r31,0(%r3)             /* store errval into &errno */
        lwz     %r0,24(%r1)
        lwz     %r31,12(%r1)
#ifdef __PIC__
        lwz     %r30,8(%r1)
#endif
        mtlr    %r0
        la      %r1,20(%r1)
        li      %r3,-1
        li      %r4,-1
        blr                             /* return to callers caller */

        .section .note.GNU-stack,"",%progbits