sbrk.S revision 92999
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 3792999Sobrien#if defined(SYSLIBC_SCCS) && !defined(lint) 3892999Sobrien .asciz "@(#)sbrk.s 5.1 (Berkeley) 4/23/90" 3992999Sobrien#endif /* SYSLIBC_SCCS and not lint */ 4092999Sobrien#include <machine/asm.h> 4192999Sobrien__FBSDID("$FreeBSD: head/lib/libc/i386/sys/sbrk.S 92999 2002-03-23 02:10:28Z obrien $"); 421849Swollman 431849Swollman#include "SYS.h" 441849Swollman 4515634Speter .globl CNAME(end) 4615634Speter .globl HIDENAME(minbrk) 4715634Speter .globl HIDENAME(curbrk) 481849Swollman 491849Swollman .data 5015634SpeterHIDENAME(minbrk): .long CNAME(end) 5115634SpeterHIDENAME(curbrk): .long CNAME(end) 521849Swollman .text 531849Swollman 541849SwollmanENTRY(sbrk) 551849Swollman#ifdef PIC 561849Swollman movl 4(%esp),%ecx 571849Swollman PIC_PROLOGUE 5815634Speter movl PIC_GOT(HIDENAME(curbrk)),%edx 591849Swollman movl (%edx),%eax 601849Swollman PIC_EPILOGUE 6111183Sphk testl %ecx,%ecx 6211183Sphk jz back 631849Swollman addl %eax,4(%esp) 6487006Sjhb mov $SYS_break,%eax 6515634Speter KERNCALL 661849Swollman jb err 671849Swollman PIC_PROLOGUE 6815634Speter movl PIC_GOT(HIDENAME(curbrk)),%edx 691849Swollman movl (%edx),%eax 701849Swollman addl %ecx,(%edx) 711849Swollman PIC_EPILOGUE 7211183Sphkback: 731849Swollman ret 741849Swollmanerr: 7515634Speter PIC_PROLOGUE 7615634Speter jmp PIC_PLT(HIDENAME(cerror)) 771849Swollman 7811183Sphk#else /* !PIC */ 791849Swollman 801849Swollman movl 4(%esp),%ecx 8115634Speter movl HIDENAME(curbrk),%eax 8211183Sphk testl %ecx,%ecx 8311183Sphk jz back 841849Swollman addl %eax,4(%esp) 8587006Sjhb mov $SYS_break,%eax 8615634Speter KERNCALL 871849Swollman jb err 8815634Speter movl HIDENAME(curbrk),%eax 8915634Speter addl %ecx,HIDENAME(curbrk) 9011183Sphkback: 911849Swollman ret 921849Swollmanerr: 9315634Speter jmp HIDENAME(cerror) 9411183Sphk#endif /* PIC */ 95