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brk.S revision 1.15.16.1 
      1  1.15.16.1       tls /*	$NetBSD: brk.S,v 1.15.16.1 2014/08/20 00:02:12 tls Exp $	*/
      2        1.3  christos 
      3        1.1       cgd /*
      4        1.1       cgd  * Copyright (c) 1992, 1993
      5        1.1       cgd  *	The Regents of the University of California.  All rights reserved.
      6        1.1       cgd  *
      7        1.1       cgd  * This software was developed by the Computer Systems Engineering group
      8        1.1       cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9        1.1       cgd  * contributed to Berkeley.
     10        1.1       cgd  *
     11        1.1       cgd  * Redistribution and use in source and binary forms, with or without
     12        1.1       cgd  * modification, are permitted provided that the following conditions
     13        1.1       cgd  * are met:
     14        1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     15        1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     16        1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     17        1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     18        1.1       cgd  *    documentation and/or other materials provided with the distribution.
     19       1.10       agc  * 3. Neither the name of the University nor the names of its contributors
     20        1.1       cgd  *    may be used to endorse or promote products derived from this software
     21        1.1       cgd  *    without specific prior written permission.
     22        1.1       cgd  *
     23        1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24        1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25        1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26        1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27        1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28        1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29        1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30        1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31        1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32        1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33        1.1       cgd  * SUCH DAMAGE.
     34        1.1       cgd  *
     35        1.1       cgd  * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp
     36        1.1       cgd  */
     37        1.1       cgd 
     38        1.3  christos #include <machine/asm.h>
     39        1.3  christos #if defined(SYSLIBC_SCCS) && !defined(lint)
     40        1.3  christos #if 0
     41        1.1       cgd 	.asciz "@(#)brk.s	8.1 (Berkeley) 6/4/93"
     42        1.3  christos #else
     43  1.15.16.1       tls 	RCSID("$NetBSD: brk.S,v 1.15.16.1 2014/08/20 00:02:12 tls Exp $")
     44        1.3  christos #endif
     45        1.3  christos #endif /* SYSLIBC_SCCS and not lint */
     46        1.1       cgd 
     47        1.1       cgd #include "SYS.h"
     48        1.1       cgd 
     49        1.6    kleink 	.globl	CURBRK
     50        1.5    kleink 	.globl	_C_LABEL(__minbrk)
     51        1.7    kleink 	.globl	_end
     52        1.1       cgd 
     53        1.8    kleink #ifdef WEAK_ALIAS
     54        1.8    kleink WEAK_ALIAS(brk, _brk)
     55        1.8    kleink #endif
     56        1.8    kleink 
     57        1.1       cgd 	.data
     58        1.5    kleink _C_LABEL(__minbrk):
     59        1.7    kleink 	.long	_end			! lower brk limit; also for gmon code
     60        1.1       cgd 	.text
     61        1.1       cgd 
     62        1.8    kleink ENTRY(_brk)
     63  1.15.16.1       tls #ifdef __PIC__
     64        1.2        pk 	PIC_PROLOGUE(%o5,%o4)
     65       1.12       uwe 	set	_C_LABEL(__minbrk), %o4
     66       1.12       uwe 	ld	[%o5 + %o4], %o4
     67        1.2        pk 	ld	[%o4], %o1		! %o1 = minbrk
     68        1.2        pk 	cmp	%o1, %o0		! if (minbrk > %o0)
     69       1.11    martin 	bgu,a	0f
     70        1.2        pk 	 mov	%o1, %o0		!	%o0 = minbrk
     71        1.2        pk 0:
     72        1.2        pk 	mov	%o0, %o2		! save argument to syscall
     73        1.2        pk 	mov	SYS_break, %g1
     74        1.2        pk 	t	ST_SYSCALL
     75       1.15  nakayama 	set	CURBRK, %o3
     76        1.2        pk 	bcc,a	1f
     77       1.15  nakayama 	 ld	[%o5 + %o3], %o4
     78        1.2        pk 	ERROR()
     79        1.2        pk 1:
     80        1.2        pk 	retl				! success, return 0 & record new break
     81       1.15  nakayama 	 st	%o2, [%o4]
     82        1.2        pk #else
     83        1.5    kleink 	sethi	%hi(_C_LABEL(__minbrk)), %o1	! %o1 = minbrk
     84        1.5    kleink 	ld	[%o1 + %lo(_C_LABEL(__minbrk))], %o1
     85        1.1       cgd 	cmp	%o1, %o0		! if (minbrk > %o0)
     86       1.11    martin 	bgu,a	0f
     87        1.1       cgd 	 mov	%o1, %o0		!	%o0 = minbrk
     88        1.1       cgd 0:
     89        1.1       cgd 	mov	%o0, %o2		! save argument to syscall
     90        1.1       cgd 	mov	SYS_break, %g1
     91        1.1       cgd 	t	ST_SYSCALL
     92        1.1       cgd 	bcc,a	1f
     93        1.6    kleink 	 sethi	%hi(CURBRK), %g1
     94        1.1       cgd 	ERROR()
     95        1.1       cgd 1:
     96        1.1       cgd 	retl				! success, return 0 & record new break
     97        1.6    kleink 	 st	%o2, [%g1 + %lo(CURBRK)]
     98        1.2        pk #endif
     99