/*      $OpenBSD: sbrk.S,v 1.10 2023/12/10 16:45:52 deraadt Exp $       */
/*      $NetBSD: sbrk.S,v 1.7 2000/07/25 15:14:46 mycroft Exp $ */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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 <machine/asm.h>

#include "SYS.h"

        .globl  __curbrk
        .hidden __curbrk
        .globl  _end

        .data
        .align  8
__curbrk:
        .xword  _end
        END(__curbrk)
        OTYPE(__curbrk)
        .text

ENTRY_NB(sbrk)
#ifdef __PIC__
        PIC_PROLOGUE(%o5, %o4)
        set     __curbrk, %o3
        ldx     [%o5 + %o3], %o2
        ldx     [%o2], %o3                      /* %o3 = old break */
        add     %o3, %o0, %o4                   /* %o4 = new break */
        mov     %o4, %o0                        /* copy for syscall */
        mov     SYS_break, %g1
99:     t       ST_SYSCALL                      /* break(new_break) */
        PINSYSCALL(SYS_break, 99b)
        bcc,a   1f                              /* if success, */
         mov    %o3, %o0                        /*    set return value */
        ERROR()
1:
        retl                                    /* and update curbrk */
         stx    %o4, [%o2]
#else
        sethi   %hi(__curbrk), %o2
        ldx     [%o2 + %lo(__curbrk)], %o3      /* %o3 = old break */
        add     %o3, %o0, %o4                   /* %o4 = new break */
        mov     %o4, %o0                        /* copy for syscall */
        mov     SYS_break, %g1
98:     t       ST_SYSCALL                      /* break(new_break) */
        PINSYSCALL(SYS_break, 98b)
        bcc,a   1f                              /* if success, */
         mov    %o3, %o0                        /*    set return value */
        ERROR()
1:
        retl                                    /* and update curbrk */
         stx    %o4, [%o2 + %lo(__curbrk)]
#endif
END(sbrk)
        .weak   sbrk