sbrk.S revision 1.13
11.13Skleink/* $NetBSD: sbrk.S,v 1.13 2000/06/23 15:40:38 kleink Exp $ */ 21.8Schristos 31.1Scgd/*- 41.1Scgd * Copyright (c) 1990 The Regents of the University of California. 51.1Scgd * All rights reserved. 61.1Scgd * 71.1Scgd * This code is derived from software contributed to Berkeley by 81.1Scgd * William Jolitz. 91.1Scgd * 101.1Scgd * Redistribution and use in source and binary forms, with or without 111.1Scgd * modification, are permitted provided that the following conditions 121.1Scgd * are met: 131.1Scgd * 1. Redistributions of source code must retain the above copyright 141.1Scgd * notice, this list of conditions and the following disclaimer. 151.1Scgd * 2. Redistributions in binary form must reproduce the above copyright 161.1Scgd * notice, this list of conditions and the following disclaimer in the 171.1Scgd * documentation and/or other materials provided with the distribution. 181.1Scgd * 3. All advertising materials mentioning features or use of this software 191.1Scgd * must display the following acknowledgement: 201.1Scgd * This product includes software developed by the University of 211.1Scgd * California, Berkeley and its contributors. 221.1Scgd * 4. Neither the name of the University nor the names of its contributors 231.1Scgd * may be used to endorse or promote products derived from this software 241.1Scgd * without specific prior written permission. 251.1Scgd * 261.1Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 271.1Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 281.1Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 291.1Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 301.1Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311.1Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 321.1Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 331.1Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 341.1Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 351.1Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361.1Scgd * SUCH DAMAGE. 371.2Sjtc * 381.2Sjtc * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 391.1Scgd */ 401.1Scgd 411.8Schristos#include <machine/asm.h> 421.1Scgd#if defined(SYSLIBC_SCCS) && !defined(lint) 431.13Skleink RCSID("$NetBSD: sbrk.S,v 1.13 2000/06/23 15:40:38 kleink Exp $") 441.1Scgd#endif /* SYSLIBC_SCCS and not lint */ 451.1Scgd 461.1Scgd#include "SYS.h" 471.1Scgd 481.1Scgd .globl _end 491.9Skleink .globl CURBRK 501.1Scgd 511.1Scgd .data 521.9SkleinkCURBRK: .long _end 531.1Scgd .text 541.1Scgd 551.13Skleink#ifdef WEAK_ALIAS 561.13SkleinkWEAK_ALIAS(sbrk, _sbrk) 571.13SkleinkENTRY(_sbrk) 581.13Skleink#else 591.1ScgdENTRY(sbrk) 601.13Skleink#endif 611.1Scgd#ifdef PIC 621.1Scgd movl 4(%esp),%ecx 631.1Scgd PIC_PROLOGUE 641.9Skleink movl PIC_GOT(CURBRK),%edx 651.5Smycroft PIC_EPILOGUE 661.1Scgd movl (%edx),%eax 671.12Smycroft addl %eax,%ecx 681.12Smycroft movl %ecx,4(%esp) 691.4Smycroft movl $(SYS_break),%eax 701.7Smycroft int $0x80 711.5Smycroft jc err 721.1Scgd PIC_PROLOGUE 731.9Skleink movl PIC_GOT(CURBRK),%edx 741.5Smycroft PIC_EPILOGUE 751.1Scgd movl (%edx),%eax 761.12Smycroft movl %ecx,(%edx) 771.1Scgd ret 781.1Scgderr: 791.10Schristos PIC_PROLOGUE 801.12Smycroft mov PIC_GOT(CERROR),%edx 811.11Smycroft PIC_EPILOGUE 821.12Smycroft jmp %edx 831.1Scgd#else 841.1Scgd movl 4(%esp),%ecx 851.9Skleink movl CURBRK,%eax 861.1Scgd addl %eax,4(%esp) 871.4Smycroft movl $(SYS_break),%eax 881.7Smycroft int $0x80 891.5Smycroft jc err 901.9Skleink movl CURBRK,%eax 911.9Skleink addl %ecx,CURBRK 921.1Scgd ret 931.1Scgderr: 941.9Skleink jmp CERROR 951.1Scgd#endif 96