/*      $OpenBSD: brk.S,v 1.10 2024/03/27 20:03:29 miod Exp $   */
/*      $NetBSD: brk.S,v 1.10 2006/01/06 03:58:31 uwe Exp $     */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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.
 *
 *      from: @(#)brk.s 5.2 (Berkeley) 12/17/90
 */

#include "SYS.h"

        .weak   brk

        .data
        .align  2
__minbrk:
        .long   _end
        .size   __minbrk, . - __minbrk
        .type   __minbrk,@object

        .text

ENTRY(brk)
#ifdef __PIC__
        mova    L_GOT, r0
        mov.l   L_GOT, r2
        add     r0, r2
        mov.l   Lminbrk, r0
        mov.l   @(r0, r2), r0
        mov.l   @r0, r0
#else
        mov.l   Lminbrk, r0
        mov.l   @r0, r0
#endif
        cmp/hs  r4, r0
        bf      1f
        mov     r0, r4
1:
        systrap SYS_break
        bf      2f
#ifdef __PIC__
        mov.l   Lcurbrk, r0
        mov.l   @(r0, r2), r1
        xor     r0, r0
#else
        xor     r0, r0
        mov.l   Lcurbrk, r1
#endif
        rts
         mov.l  r4, @r1
2:
        SET_ERRNO_AND_RETURN(break)

        .align  2
        systrap_data SYS_break
#ifdef __PIC__
L_GOT:          .long   _GLOBAL_OFFSET_TABLE_
Lminbrk:        .long   __minbrk@GOT
Lcurbrk:        .long   __curbrk@GOT
#else
Lminbrk:        .long   __minbrk
Lcurbrk:        .long   __curbrk
#endif
        SET_ENTRY_SIZE(brk)