sbrk.S revision 1.2
11.1Scgd/*- 21.1Scgd * Copyright (c) 1990 The Regents of the University of California. 31.1Scgd * All rights reserved. 41.1Scgd * 51.1Scgd * This code is derived from software contributed to Berkeley by 61.1Scgd * William Jolitz. 71.1Scgd * 81.1Scgd * Redistribution and use in source and binary forms, with or without 91.1Scgd * modification, are permitted provided that the following conditions 101.1Scgd * are met: 111.1Scgd * 1. Redistributions of source code must retain the above copyright 121.1Scgd * notice, this list of conditions and the following disclaimer. 131.1Scgd * 2. Redistributions in binary form must reproduce the above copyright 141.1Scgd * notice, this list of conditions and the following disclaimer in the 151.1Scgd * documentation and/or other materials provided with the distribution. 161.1Scgd * 3. All advertising materials mentioning features or use of this software 171.1Scgd * must display the following acknowledgement: 181.1Scgd * This product includes software developed by the University of 191.1Scgd * California, Berkeley and its contributors. 201.1Scgd * 4. Neither the name of the University nor the names of its contributors 211.1Scgd * may be used to endorse or promote products derived from this software 221.1Scgd * without specific prior written permission. 231.1Scgd * 241.1Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251.1Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261.1Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271.1Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281.1Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291.1Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301.1Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311.1Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321.1Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331.1Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341.1Scgd * SUCH DAMAGE. 351.2Sjtc * 361.2Sjtc * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 371.2Sjtc * $Id: sbrk.S,v 1.2 1993/10/21 02:19:36 jtc Exp $ 381.1Scgd */ 391.1Scgd 401.1Scgd#if defined(SYSLIBC_SCCS) && !defined(lint) 411.1Scgd .text 421.2Sjtc .asciz "$Id: sbrk.S,v 1.2 1993/10/21 02:19:36 jtc Exp $" 431.1Scgd#endif /* SYSLIBC_SCCS and not lint */ 441.1Scgd 451.1Scgd#include "SYS.h" 461.1Scgd 471.1Scgd#define SYS_brk 17 481.1Scgd 491.1Scgd .globl _end 501.1Scgd .globl minbrk 511.1Scgd .globl curbrk 521.1Scgd 531.1Scgd .data 541.1Scgdminbrk: .long _end 551.1Scgdcurbrk: .long _end 561.1Scgd .text 571.1Scgd 581.1ScgdENTRY(sbrk) 591.1Scgd#ifdef PIC 601.1Scgd movl 4(%esp),%ecx 611.1Scgd PIC_PROLOGUE 621.1Scgd movl PIC_GOT(curbrk),%edx 631.1Scgd movl (%edx),%eax 641.1Scgd PIC_EPILOGUE 651.1Scgd addl %eax,4(%esp) 661.1Scgd lea SYS_brk,%eax 671.1Scgd LCALL(7,0) 681.1Scgd jb err 691.1Scgd PIC_PROLOGUE 701.1Scgd movl PIC_GOT(curbrk),%edx 711.1Scgd movl (%edx),%eax 721.1Scgd addl %ecx,(%edx) 731.1Scgd PIC_EPILOGUE 741.1Scgd ret 751.1Scgderr: 761.1Scgd jmp PIC_PLT(cerror) 771.1Scgd 781.1Scgd#else 791.1Scgd 801.1Scgd movl 4(%esp),%ecx 811.1Scgd movl curbrk,%eax 821.1Scgd addl %eax,4(%esp) 831.1Scgd lea SYS_brk,%eax 841.1Scgd LCALL(7,0) 851.1Scgd jb err 861.1Scgd movl curbrk,%eax 871.1Scgd addl %ecx,curbrk 881.1Scgd ret 891.1Scgderr: 901.1Scgd jmp cerror 911.1Scgd#endif 92