/*      $OpenBSD: sbrk.S,v 1.13 2023/01/11 01:55:17 mortimer Exp $      */
/*      $NetBSD: sbrk.S,v 1.1 2001/06/19 00:25:06 fvdl 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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: @(#)sbrk.s        5.1 (Berkeley) 4/23/90
 */

#include <machine/asm.h>

#include "SYS.h"

        .globl  _end
        .globl  __curbrk
        .hidden __curbrk

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

ENTRY_NB(sbrk)
        RETGUARD_SETUP(sbrk, r11);
        RETGUARD_PUSH(r11);
        movq    __curbrk(%rip),%rax
        movslq  %edi,%rsi
        movq    %rsi,%rdi
        addq    %rax,%rdi
        SYSTRAP(break)
        jc      1f
        movq    __curbrk(%rip),%rax
        addq    %rsi,__curbrk(%rip)
        jmp     2f
1:
        SET_ERRNO
2:
        RETGUARD_POP(r11);
        RETGUARD_CHECK(sbrk, r11);
        ret
END(sbrk)
        .weak   sbrk