sbrk.S revision 87006
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 375790Sdg#if defined(SYSLIBC_RCS) && !defined(lint) 385790Sdg .text 3950476Speter .asciz "$FreeBSD: head/lib/libc/i386/sys/sbrk.S 87006 2001-11-27 20:51:26Z jhb $" 405790Sdg#endif /* SYSLIBC_RCS and not lint */ 411849Swollman 421849Swollman#include "SYS.h" 431849Swollman 4415634Speter .globl CNAME(end) 4515634Speter .globl HIDENAME(minbrk) 4615634Speter .globl HIDENAME(curbrk) 471849Swollman 481849Swollman .data 4915634SpeterHIDENAME(minbrk): .long CNAME(end) 5015634SpeterHIDENAME(curbrk): .long CNAME(end) 511849Swollman .text 521849Swollman 531849SwollmanENTRY(sbrk) 541849Swollman#ifdef PIC 551849Swollman movl 4(%esp),%ecx 561849Swollman PIC_PROLOGUE 5715634Speter movl PIC_GOT(HIDENAME(curbrk)),%edx 581849Swollman movl (%edx),%eax 591849Swollman PIC_EPILOGUE 6011183Sphk testl %ecx,%ecx 6111183Sphk jz back 621849Swollman addl %eax,4(%esp) 6387006Sjhb mov $SYS_break,%eax 6415634Speter KERNCALL 651849Swollman jb err 661849Swollman PIC_PROLOGUE 6715634Speter movl PIC_GOT(HIDENAME(curbrk)),%edx 681849Swollman movl (%edx),%eax 691849Swollman addl %ecx,(%edx) 701849Swollman PIC_EPILOGUE 7111183Sphkback: 721849Swollman ret 731849Swollmanerr: 7415634Speter PIC_PROLOGUE 7515634Speter jmp PIC_PLT(HIDENAME(cerror)) 761849Swollman 7711183Sphk#else /* !PIC */ 781849Swollman 791849Swollman movl 4(%esp),%ecx 8015634Speter movl HIDENAME(curbrk),%eax 8111183Sphk testl %ecx,%ecx 8211183Sphk jz back 831849Swollman addl %eax,4(%esp) 8487006Sjhb mov $SYS_break,%eax 8515634Speter KERNCALL 861849Swollman jb err 8715634Speter movl HIDENAME(curbrk),%eax 8815634Speter addl %ecx,HIDENAME(curbrk) 8911183Sphkback: 901849Swollman ret 911849Swollmanerr: 9215634Speter jmp HIDENAME(cerror) 9311183Sphk#endif /* PIC */ 94