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brk.S revision 1.17.2.1 
      1  1.17.2.1   nathanw /*	$NetBSD: brk.S,v 1.17.2.1 2001/10/08 20:17:37 nathanw Exp $	*/
      2      1.10  christos 
      3       1.1       cgd /*-
      4       1.1       cgd  * Copyright (c) 1990 The Regents of the University of California.
      5       1.1       cgd  * All rights reserved.
      6       1.1       cgd  *
      7       1.1       cgd  * This code is derived from software contributed to Berkeley by
      8       1.1       cgd  * William Jolitz.
      9       1.1       cgd  *
     10       1.1       cgd  * Redistribution and use in source and binary forms, with or without
     11       1.1       cgd  * modification, are permitted provided that the following conditions
     12       1.1       cgd  * are met:
     13       1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     14       1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     15       1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     17       1.1       cgd  *    documentation and/or other materials provided with the distribution.
     18       1.1       cgd  * 3. All advertising materials mentioning features or use of this software
     19       1.1       cgd  *    must display the following acknowledgement:
     20       1.1       cgd  *	This product includes software developed by the University of
     21       1.1       cgd  *	California, Berkeley and its contributors.
     22       1.1       cgd  * 4. Neither the name of the University nor the names of its contributors
     23       1.1       cgd  *    may be used to endorse or promote products derived from this software
     24       1.1       cgd  *    without specific prior written permission.
     25       1.1       cgd  *
     26       1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27       1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28       1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29       1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30       1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31       1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32       1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33       1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34       1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35       1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36       1.1       cgd  * SUCH DAMAGE.
     37       1.2       jtc  *
     38       1.2       jtc  *	from: @(#)brk.s	5.2 (Berkeley) 12/17/90
     39       1.1       cgd  */
     40       1.1       cgd 
     41      1.10  christos #include <machine/asm.h>
     42       1.1       cgd #if defined(SYSLIBC_SCCS) && !defined(lint)
     43  1.17.2.1   nathanw 	RCSID("$NetBSD: brk.S,v 1.17.2.1 2001/10/08 20:17:37 nathanw Exp $")
     44       1.1       cgd #endif /* SYSLIBC_SCCS and not lint */
     45       1.1       cgd 
     46       1.1       cgd #include "SYS.h"
     47       1.1       cgd 
     48       1.8   mycroft 	.globl	_end
     49      1.11    kleink 	.globl	_C_LABEL(__minbrk)
     50      1.11    kleink 	.globl	CURBRK
     51       1.8   mycroft 
     52      1.16    kleink #ifdef WEAK_ALIAS
     53      1.16    kleink WEAK_ALIAS(brk, _brk)
     54      1.16    kleink #endif
     55      1.16    kleink 
     56       1.8   mycroft 	.data
     57      1.11    kleink _C_LABEL(__minbrk):
     58      1.11    kleink 	.long	_end
     59       1.8   mycroft 	.text
     60       1.1       cgd 
     61      1.15    kleink ENTRY(_brk)
     62       1.1       cgd #ifdef PIC
     63       1.7   mycroft 	movl	4(%esp),%ecx
     64       1.1       cgd 	PIC_PROLOGUE
     65      1.11    kleink 	movl	PIC_GOT(_C_LABEL(__minbrk)),%edx
     66       1.1       cgd 	PIC_EPILOGUE
     67       1.7   mycroft 	cmpl	%ecx,(%edx)
     68  1.17.2.1   nathanw 	jb	1f
     69       1.7   mycroft 	movl	(%edx),%ecx
     70       1.7   mycroft 	movl	%ecx,4(%esp)
     71       1.7   mycroft 1:
     72      1.17   mycroft 	SYSTRAP(break)
     73       1.7   mycroft 	jc	err
     74       1.7   mycroft 	PIC_PROLOGUE
     75      1.11    kleink 	movl	PIC_GOT(CURBRK),%edx	# set up GOT addressing
     76       1.7   mycroft 	PIC_EPILOGUE
     77      1.14   mycroft 	movl	%ecx,(%edx)
     78       1.4       jtc 	xorl	%eax,%eax
     79       1.1       cgd 	ret
     80       1.1       cgd err:
     81      1.12  christos 	PIC_PROLOGUE
     82      1.14   mycroft 	mov	PIC_GOT(CERROR),%edx
     83      1.13   mycroft 	PIC_EPILOGUE
     84      1.14   mycroft 	jmp	%edx
     85       1.1       cgd #else
     86       1.7   mycroft 	movl	4(%esp),%ecx
     87      1.11    kleink 	cmpl	%ecx,_C_LABEL(__minbrk)
     88  1.17.2.1   nathanw 	jb	1f
     89      1.11    kleink 	movl	_C_LABEL(__minbrk),%ecx
     90       1.7   mycroft 	movl	%ecx,4(%esp)
     91       1.7   mycroft 1:
     92      1.17   mycroft 	SYSTRAP(break)
     93       1.7   mycroft 	jc	err
     94      1.14   mycroft 	movl	%ecx,CURBRK
     95       1.4       jtc 	xorl	%eax,%eax
     96       1.1       cgd 	ret
     97       1.1       cgd err:
     98      1.11    kleink 	jmp	CERROR
     99       1.1       cgd #endif
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