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sbrk.S revision 1.7 
      1 /*	$NetBSD: sbrk.S,v 1.7 2020/05/05 06:20:55 skrll Exp $	*/
      2 
      3 /*	$OpenBSD: sbrk.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  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     28  * THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "SYS.h"
     32 
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 	RCSID("$NetBSD: sbrk.S,v 1.7 2020/05/05 06:20:55 skrll Exp $")
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 	.global	_end
     38 
     39 #ifdef WEAK_ALIAS
     40 	WEAK_ALIAS(sbrk, _sbrk)
     41 #endif
     42 
     43 	.data
     44 	.export	curbrk, data
     45 curbrk:
     46 	.long	_end
     47 
     48 ENTRY(_sbrk,0)
     49 #ifdef __PIC__
     50 	addil	LT%curbrk, %r19
     51 	ldw	RT%curbrk(%r1), %r1
     52 	ldw	0(%r1), %t2
     53 #else  /* !__PIC__ */
     54 	ldil	L%curbrk, %t1
     55 	ldw	R%curbrk(%t1), %t2
     56 #endif /* !__PIC__ */
     57 	add	%arg0, %t2, %arg0
     58 	stw	%arg0, HPPA_FRAME_ARG(0)(%sp)
     59 
     60 	SYSCALL(break)
     61 
     62 #ifdef __PIC__
     63 	addil	LT%curbrk, %r19
     64 	ldw	RT%curbrk(%r1), %r1
     65 #else  /* !__PIC__ */
     66 	ldil	L%curbrk, %t1
     67 	ldo	R%curbrk(%t1), %r1
     68 #endif /* !__PIC__ */
     69 	ldw	0(%r1), %ret0
     70 	ldw	HPPA_FRAME_ARG(0)(%sp), %arg0
     71 	bv	%r0(%rp)
     72 	 stw	%arg0, 0(%r1)
     73 
     74 EXIT(sbrk)
     75 
     76 	.end
     77