brk.S revision 50476
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 * 3650476Speter * $FreeBSD: head/lib/libc/i386/sys/brk.S 50476 1999-08-28 00:22:10Z peter $ 371849Swollman */ 381849Swollman 395790Sdg#if defined(SYSLIBC_RCS) && !defined(lint) 405790Sdg .text 4150476Speter .asciz "$FreeBSD: head/lib/libc/i386/sys/brk.S 50476 1999-08-28 00:22:10Z peter $" 425790Sdg#endif /* SYSLIBC_RCS and not lint */ 431849Swollman 441849Swollman#include "SYS.h" 451849Swollman 4615634Speter .globl HIDENAME(curbrk) 4715634Speter .globl HIDENAME(minbrk) 481849SwollmanENTRY(_brk) 491849Swollman jmp ok 501849Swollman 511849SwollmanENTRY(brk) 521849Swollman#ifdef PIC 531849Swollman movl 4(%esp),%eax 541849Swollman PIC_PROLOGUE 5515634Speter movl PIC_GOT(HIDENAME(curbrk)),%edx # set up GOT addressing 5615634Speter movl PIC_GOT(HIDENAME(minbrk)),%ecx # 5716719Sbde PIC_EPILOGUE 581849Swollman cmpl %eax,(%ecx) 5916719Sbde jbe ok 601849Swollman movl (%ecx),%eax 611849Swollman movl %eax,4(%esp) 621849Swollmanok: 6315634Speter lea SYS_break,%eax 6415634Speter KERNCALL 651849Swollman jb err 661849Swollman movl 4(%esp),%eax 671849Swollman movl %eax,(%edx) 681849Swollman movl $0,%eax 691849Swollman ret 701849Swollmanerr: 7115634Speter PIC_PROLOGUE 7215634Speter jmp PIC_PLT(HIDENAME(cerror)) 731849Swollman 741849Swollman#else 751849Swollman 761849Swollman movl 4(%esp),%eax 7715634Speter cmpl %eax,HIDENAME(minbrk) 7816719Sbde jbe ok 7915634Speter movl HIDENAME(minbrk),%eax 801849Swollman movl %eax,4(%esp) 811849Swollmanok: 8215634Speter lea SYS_break,%eax 8315634Speter KERNCALL 841849Swollman jb err 851849Swollman movl 4(%esp),%eax 8615634Speter movl %eax,HIDENAME(curbrk) 871849Swollman movl $0,%eax 881849Swollman ret 891849Swollmanerr: 9015634Speter jmp HIDENAME(cerror) 911849Swollman#endif 92