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brk.S revision 1.3 
      1 /*	$NetBSD: brk.S,v 1.3 2003/10/06 05:30:21 matt Exp $	*/
      2 
      3 /*	$OpenBSD: brk.S,v 1.7 2001/06/04 23:14:04 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1999 Michael Shalayeff
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed by Michael Shalayeff.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
     27  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     28  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     29  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     31  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     32  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     33  * THE POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 #include "SYS.h"
     37 
     38 #if defined(LIBC_SCCS) && !defined(lint)
     39 	RCSID("$NetBSD: brk.S,v 1.3 2003/10/06 05:30:21 matt Exp $")
     40 #endif /* LIBC_SCCS and not lint */
     41 
     42 	.import	curbrk, data
     43 	.import	end, data
     44 
     45 #ifdef WEAK_ALIAS
     46 	WEAK_ALIAS(brk, _brk)
     47 #endif
     48 
     49 	.data
     50 	.export	__minbrk, data
     51 __minbrk:
     52 	.long	end
     53 
     54 ENTRY(_brk,0)
     55 #ifdef PIC
     56 	addil	LT%__minbrk, %r19
     57 	ldw	RT%__minbrk(%r1), %r1
     58 	ldw	0(%r1), %t2
     59 #else  /* !PIC */
     60 	ldil	L%__minbrk, %t1
     61 	ldw	R%__minbrk(%t1), %t2
     62 #endif /* !PIC */
     63 	sub,<<	%t2, %arg0, %r0
     64 	copy	%t2, %arg0
     65 	stw	%arg0, HPPA_FRAME_ARG(0)(%sp)
     66 
     67 	SYSCALL(break)
     68 
     69 	ldw	HPPA_FRAME_ARG(0)(%sp), %arg0
     70 #ifdef PIC
     71 	addil	LT%curbrk, %r19
     72 	ldw	RT%curbrk(%r1), %r1
     73 	bv	%r0(%rp)
     74 	stw	%arg0, 0(%r1)
     75 #else  /* !PIC */
     76 	ldil	L%curbrk, %t1
     77 	bv	%r0(%rp)
     78 	stw	%arg0, R%curbrk(%t1)
     79 #endif /* !PIC */
     80 EXIT(brk)
     81 
     82 	.end
     83 
     84