/* $NetBSD: sbrk.S,v 1.22 2014/05/23 02:34:19 uebayasi 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: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 */ #include <machine/asm.h> #if defined(SYSLIBC_SCCS) && !defined(lint) RCSID("$NetBSD: sbrk.S,v 1.22 2014/05/23 02:34:19 uebayasi Exp $") #endif /* SYSLIBC_SCCS and not lint */ #include "SYS.h" .globl _end .globl CURBRK #ifdef WEAK_ALIAS WEAK_ALIAS(sbrk, _sbrk) #endif .data CURBRK: .long _end .text ENTRY(_sbrk) #ifdef __PIC__ movl 4(%esp),%ecx PIC_PROLOGUE movl PIC_GOT(CURBRK),%edx PIC_EPILOGUE movl (%edx),%eax test %ecx,%ecx jz out addl %eax,%ecx movl %ecx,4(%esp) OSYSTRAP(break) /* don't clobber %ecx */ jc err PIC_PROLOGUE movl PIC_GOT(CURBRK),%edx PIC_EPILOGUE movl (%edx),%eax movl %ecx,(%edx) out: ret err: jmp CERROR #else movl 4(%esp),%ecx movl CURBRK,%eax test %ecx,%ecx jz out addl %eax,4(%esp) OSYSTRAP(break) /* don't clobber %ecx */ jc err movl CURBRK,%eax addl %ecx,CURBRK out: ret err: jmp CERROR #endif END(_sbrk) |