/*      $OpenBSD: sbrk.S,v 1.16 2023/12/10 16:45:51 deraadt 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.
 */

#include "SYS.h"

        .globl  _end
        .globl  __curbrk
        .hidden __curbrk

        .data
__curbrk:       .long   _end
        END(__curbrk)
        .type   __curbrk,@object

ENTRY_NB(sbrk)
#ifdef __PIC__
        movl    4(%esp),%ecx
        PIC_PROLOGUE
        movl    PIC_GOT(__curbrk),%edx
        PIC_EPILOGUE
        movl    (%edx),%eax
        addl    %eax,4(%esp)
        movl    $(SYS_break),%eax
99:     int     $0x80
        PINSYSCALL(SYS_break, 99b)
        jc      2f
        PIC_PROLOGUE
        movl    PIC_GOT(__curbrk),%edx
        PIC_EPILOGUE
        movl    (%edx),%eax
        addl    %ecx,(%edx)

#else

        movl    4(%esp),%ecx
        movl    __curbrk,%eax
        addl    %eax,4(%esp)
        movl    $(SYS_break),%eax
98:     int     $0x80
        PINSYSCALL(SYS_break, 98b)
        jc      2f
        movl    __curbrk,%eax
        addl    %ecx,__curbrk
#endif
        ret
2:
        SET_ERRNO()
        ret
END(sbrk)
        .weak   sbrk