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File: [cvs.NetBSD.org] / src / lib / libc / arch / sparc64 / sys / brk.S (download)

Revision 1.12, Fri Dec 26 11:21:48 2003 UTC (18 years, 7 months ago) by martin
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-pf42, yamt-pagecache-tag8, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, wrstuden-revivesa-base-3, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, wrstuden-revivesa, wrstuden-fixsa-newbase, wrstuden-fixsa-base-1, wrstuden-fixsa-base, wrstuden-fixsa, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, netbsd-4-base, netbsd-4-0-RELEASE, netbsd-4-0-RC5, netbsd-4-0-RC4, netbsd-4-0-RC3, netbsd-4-0-RC2, netbsd-4-0-RC1, netbsd-4-0-1-RELEASE, netbsd-4-0, netbsd-4, netbsd-3-base, netbsd-3-1-RELEASE, netbsd-3-1-RC4, netbsd-3-1-RC3, netbsd-3-1-RC2, netbsd-3-1-RC1, netbsd-3-1-1-RELEASE, netbsd-3-1, netbsd-3-0-RELEASE, netbsd-3-0-RC6, netbsd-3-0-RC5, netbsd-3-0-RC4, netbsd-3-0-RC3, netbsd-3-0-RC2, netbsd-3-0-RC1, netbsd-3-0-3-RELEASE, netbsd-3-0-2-RELEASE, netbsd-3-0-1-RELEASE, netbsd-3-0, netbsd-3, netbsd-2-base, netbsd-2-1-RELEASE, netbsd-2-1-RC6, netbsd-2-1-RC5, netbsd-2-1-RC4, netbsd-2-1-RC3, netbsd-2-1-RC2, netbsd-2-1-RC1, netbsd-2-1, netbsd-2-0-base, netbsd-2-0-RELEASE, netbsd-2-0-RC5, netbsd-2-0-RC4, netbsd-2-0-RC3, netbsd-2-0-RC2, netbsd-2-0-RC1, netbsd-2-0-3-RELEASE, netbsd-2-0-2-RELEASE, netbsd-2-0-1-RELEASE, netbsd-2-0, netbsd-2, mjf-devfs2-base, mjf-devfs2, matt-premerge-20091211, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-premerge-20101231, matt-mips64-base2, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-base, keiichi-mipv6, jym-xensuspend-nbase, jym-xensuspend-base, jym-xensuspend, hpcarm-cleanup-nbase, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf, christos-time_t-nbase, christos-time_t-base, christos-time_t, cherry-xenmp-base, cherry-xenmp, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, abandoned-netbsd-4-base, abandoned-netbsd-4
Branch point for: yamt-pagecache, tls-maxphys
Changes since 1.11: +5 -5 lines

Use an unsigned comparison against minbrk.
From OpenBSD, changed by Miod Vallat.

/*	$NetBSD: brk.S,v 1.12 2003/12/26 11:21:48 martin 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 1.12 2003/12/26 11:21:48 martin 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

ENTRY(_brk)
#ifdef PIC
#ifdef BIGPIC
	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]
#else
	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]
#endif
#else
	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