96 lines
2.7 KiB
ArmAsm
96 lines
2.7 KiB
ArmAsm
|
/* $NetBSD: brk.S,v 1.21 2007/03/09 14:30:56 ad Exp $ */
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to Berkeley by
|
||
|
|
* William Jolitz.
|
||
|
|
*
|
||
|
|
* 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. Neither the name of the University nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 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.
|
||
|
|
*
|
||
|
|
* from: @(#)brk.s 5.2 (Berkeley) 12/17/90
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <machine/asm.h>
|
||
|
|
#if defined(SYSLIBC_SCCS) && !defined(lint)
|
||
|
|
RCSID("$NetBSD: brk.S,v 1.21 2007/03/09 14:30:56 ad Exp $")
|
||
|
|
#endif /* SYSLIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
#include "SYS.h"
|
||
|
|
|
||
|
|
.globl _end
|
||
|
|
.globl _C_LABEL(__minbrk)
|
||
|
|
.globl CURBRK
|
||
|
|
|
||
|
|
#ifdef WEAK_ALIAS
|
||
|
|
WEAK_ALIAS(brk, _brk)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
.data
|
||
|
|
_C_LABEL(__minbrk):
|
||
|
|
.long _end
|
||
|
|
.text
|
||
|
|
|
||
|
|
ENTRY(_brk)
|
||
|
|
#ifdef PIC
|
||
|
|
movl 4(%esp),%ecx
|
||
|
|
PIC_PROLOGUE
|
||
|
|
movl PIC_GOT(_C_LABEL(__minbrk)),%edx
|
||
|
|
PIC_EPILOGUE
|
||
|
|
cmpl %ecx,(%edx)
|
||
|
|
jb 1f
|
||
|
|
movl (%edx),%ecx
|
||
|
|
movl %ecx,4(%esp)
|
||
|
|
1:
|
||
|
|
OSYSTRAP(break) /* don't clobber %ecx */
|
||
|
|
jc err
|
||
|
|
PIC_PROLOGUE
|
||
|
|
movl PIC_GOT(CURBRK),%edx # set up GOT addressing
|
||
|
|
PIC_EPILOGUE
|
||
|
|
movl %ecx,(%edx)
|
||
|
|
xorl %eax,%eax
|
||
|
|
ret
|
||
|
|
err:
|
||
|
|
PIC_PROLOGUE
|
||
|
|
mov PIC_GOT(CERROR),%edx
|
||
|
|
PIC_EPILOGUE
|
||
|
|
jmp *%edx
|
||
|
|
#else
|
||
|
|
movl 4(%esp),%ecx
|
||
|
|
cmpl %ecx,_C_LABEL(__minbrk)
|
||
|
|
jb 1f
|
||
|
|
movl _C_LABEL(__minbrk),%ecx
|
||
|
|
movl %ecx,4(%esp)
|
||
|
|
1:
|
||
|
|
OSYSTRAP(break) /* don't clobber %ecx */
|
||
|
|
jc err
|
||
|
|
movl %ecx,CURBRK
|
||
|
|
xorl %eax,%eax
|
||
|
|
ret
|
||
|
|
err:
|
||
|
|
jmp CERROR
|
||
|
|
#endif
|