minix/lib/libc/arch/sparc64/sys/brk.S

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/* $NetBSD: brk.S,v 1.13 2013/09/12 15:36:16 joerg 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.
*
* from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp
*/
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
#if 0
.asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93"
#else
RCSID("$NetBSD: brk.S,v 1.13 2013/09/12 15:36:16 joerg Exp $")
#endif
#endif /* SYSLIBC_SCCS and not lint */
#include "SYS.h"
.globl _C_LABEL(__curbrk)
.globl _C_LABEL(__minbrk)
.globl _C_LABEL(_end)
#ifdef WEAK_ALIAS
WEAK_ALIAS(brk, _brk)
#endif
.data
.align 8
_C_LABEL(__minbrk):
.xword _C_LABEL(_end) /* lower brk limit; also for gmon code */
.text
#if __PIC__ - 0 >= 2
ENTRY(_brk)
PIC_PROLOGUE(%o5,%o4)
set _C_LABEL(__minbrk), %o4
ldx [%o5 + %o4], %o4
ldx [%o4], %o1 /* %o1 = minbrk */
cmp %o1, %o0 /* if (minbrk > %o0) */
movgu %xcc, %o1, %o0 /* %o0 = minbrk */
mov %o0, %o2 /* save argument to syscall */
mov SYS_break, %g1
t ST_SYSCALL
set _C_LABEL(__curbrk), %o3
bcc,a,pt %icc, 1f
ldx [%o5 + %o3], %o4
ERROR()
1:
retl /* success, return 0 & record new break */
stx %o2, [%o4]
#elif __PIC__ - 0 >= 1
ENTRY(_brk)
PIC_PROLOGUE(%o5,%o4)
ldx [%o5 + _C_LABEL(__minbrk)], %o4
ldx [%o4], %o1 /* %o1 = minbrk */
cmp %o1, %o0 /* if (minbrk > %o0) */
movgu %xcc, %o1, %o0 /* %o0 = minbrk */
mov %o0, %o2 /* save argument to syscall */
mov SYS_break, %g1
t ST_SYSCALL
bcc,a,pt %icc, 1f
ldx [%o5 + _C_LABEL(__curbrk)], %o4
ERROR()
1:
retl /* success, return 0 & record new break */
stx %o2, [%o4]
#else
ENTRY(_brk)
sethi %hi(_C_LABEL(__minbrk)), %o1 /* %o1 = minbrk */
ldx [%o1 + %lo(_C_LABEL(__minbrk))], %o1
cmp %o1, %o0 /* if (minbrk > %o0) */
movgu %xcc, %o1, %o0 /* %o0 = minbrk */
mov %o0, %o2 /* save argument to syscall */
mov SYS_break, %g1
t ST_SYSCALL
bcc,a,pt %icc,1f
sethi %hi(_C_LABEL(__curbrk)), %g1
ERROR()
1:
retl /* success, return 0 & record new break */
stx %o2, [%g1 + %lo(_C_LABEL(__curbrk))]
#endif