sbrk.S revision 1849
11849Swollman/*- 21849Swollman * Copyright (c) 1990 The Regents of the University of California. 31849Swollman * All rights reserved. 41849Swollman * 51849Swollman * This code is derived from software contributed to Berkeley by 61849Swollman * William Jolitz. 71849Swollman * 81849Swollman * Redistribution and use in source and binary forms, with or without 91849Swollman * modification, are permitted provided that the following conditions 101849Swollman * are met: 111849Swollman * 1. Redistributions of source code must retain the above copyright 121849Swollman * notice, this list of conditions and the following disclaimer. 131849Swollman * 2. Redistributions in binary form must reproduce the above copyright 141849Swollman * notice, this list of conditions and the following disclaimer in the 151849Swollman * documentation and/or other materials provided with the distribution. 161849Swollman * 3. All advertising materials mentioning features or use of this software 171849Swollman * must display the following acknowledgement: 181849Swollman * This product includes software developed by the University of 191849Swollman * California, Berkeley and its contributors. 201849Swollman * 4. Neither the name of the University nor the names of its contributors 211849Swollman * may be used to endorse or promote products derived from this software 221849Swollman * without specific prior written permission. 231849Swollman * 241849Swollman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251849Swollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261849Swollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271849Swollman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281849Swollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291849Swollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301849Swollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311849Swollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321849Swollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331849Swollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341849Swollman * SUCH DAMAGE. 351849Swollman * 361849Swollman * $Id: sbrk.S,v 1.2 1994/02/21 05:19:16 rgrimes Exp $ 371849Swollman */ 381849Swollman 391849Swollman#if defined(SYSLIBC_SCCS) && !defined(lint) 401849Swollman .asciz "@(#)sbrk.s 5.1 (Berkeley) 4/23/90" 411849Swollman#endif /* SYSLIBC_SCCS and not lint */ 421849Swollman 431849Swollman#include "SYS.h" 441849Swollman 451849Swollman#define SYS_brk 17 461849Swollman 471849Swollman .globl _end 481849Swollman .globl minbrk 491849Swollman .globl curbrk 501849Swollman 511849Swollman .data 521849Swollmanminbrk: .long _end 531849Swollmancurbrk: .long _end 541849Swollman .text 551849Swollman 561849SwollmanENTRY(sbrk) 571849Swollman#ifdef PIC 581849Swollman movl 4(%esp),%ecx 591849Swollman PIC_PROLOGUE 601849Swollman movl PIC_GOT(curbrk),%edx 611849Swollman movl (%edx),%eax 621849Swollman PIC_EPILOGUE 631849Swollman addl %eax,4(%esp) 641849Swollman lea SYS_brk,%eax 651849Swollman LCALL(7,0) 661849Swollman jb err 671849Swollman PIC_PROLOGUE 681849Swollman movl PIC_GOT(curbrk),%edx 691849Swollman movl (%edx),%eax 701849Swollman addl %ecx,(%edx) 711849Swollman PIC_EPILOGUE 721849Swollman ret 731849Swollmanerr: 741849Swollman jmp PIC_PLT(cerror) 751849Swollman 761849Swollman#else 771849Swollman 781849Swollman movl 4(%esp),%ecx 791849Swollman movl curbrk,%eax 801849Swollman addl %eax,4(%esp) 811849Swollman lea SYS_brk,%eax 821849Swollman LCALL(7,0) 831849Swollman jb err 841849Swollman movl curbrk,%eax 851849Swollman addl %ecx,curbrk 861849Swollman ret 871849Swollmanerr: 881849Swollman jmp cerror 891849Swollman#endif 90