xref: /src/lib/libc/arch/hppa/sys/brk.S

/*	$NetBSD: brk.S,v 1.3 2003/10/06 05:30:21 matt Exp $	*/

/*	$OpenBSD: brk.S,v 1.7 2001/06/04 23:14:04 mickey Exp $	*/

/*
 * Copyright (c) 1999 Michael Shalayeff
 * All rights reserved.
 *
 * 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 Michael Shalayeff.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR OR HIS RELATIVES 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 MIND, 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"

#if defined(LIBC_SCCS) && !defined(lint)
	RCSID("$NetBSD: brk.S,v 1.3 2003/10/06 05:30:21 matt Exp $")
#endif /* LIBC_SCCS and not lint */

	.import	curbrk, data
	.import	end, data

#ifdef WEAK_ALIAS
	WEAK_ALIAS(brk, _brk)
#endif

	.data
	.export	__minbrk, data
__minbrk:
	.long	end

ENTRY(_brk,0)
#ifdef PIC
	addil	LT%__minbrk, %r19
	ldw	RT%__minbrk(%r1), %r1
	ldw	0(%r1), %t2
#else  /* !PIC */
	ldil	L%__minbrk, %t1
	ldw	R%__minbrk(%t1), %t2
#endif /* !PIC */
	sub,<<	%t2, %arg0, %r0
	copy	%t2, %arg0
	stw	%arg0, HPPA_FRAME_ARG(0)(%sp)

	SYSCALL(break)

	ldw	HPPA_FRAME_ARG(0)(%sp), %arg0
#ifdef PIC
	addil	LT%curbrk, %r19
	ldw	RT%curbrk(%r1), %r1
	bv	%r0(%rp)
	stw	%arg0, 0(%r1)
#else  /* !PIC */
	ldil	L%curbrk, %t1
	bv	%r0(%rp)
	stw	%arg0, R%curbrk(%t1)
#endif /* !PIC */
EXIT(brk)

	.end