brk.S revision 1.7
1 1.1 cgd /*- 2 1.1 cgd * Copyright (c) 1990 The Regents of the University of California. 3 1.1 cgd * All rights reserved. 4 1.1 cgd * 5 1.1 cgd * This code is derived from software contributed to Berkeley by 6 1.1 cgd * William Jolitz. 7 1.1 cgd * 8 1.1 cgd * Redistribution and use in source and binary forms, with or without 9 1.1 cgd * modification, are permitted provided that the following conditions 10 1.1 cgd * are met: 11 1.1 cgd * 1. Redistributions of source code must retain the above copyright 12 1.1 cgd * notice, this list of conditions and the following disclaimer. 13 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 14 1.1 cgd * notice, this list of conditions and the following disclaimer in the 15 1.1 cgd * documentation and/or other materials provided with the distribution. 16 1.1 cgd * 3. All advertising materials mentioning features or use of this software 17 1.1 cgd * must display the following acknowledgement: 18 1.1 cgd * This product includes software developed by the University of 19 1.1 cgd * California, Berkeley and its contributors. 20 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 21 1.1 cgd * may be used to endorse or promote products derived from this software 22 1.1 cgd * without specific prior written permission. 23 1.1 cgd * 24 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 1.1 cgd * SUCH DAMAGE. 35 1.2 jtc * 36 1.2 jtc * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 37 1.7 mycroft * $Id: brk.S,v 1.7 1994/01/27 06:35:00 mycroft Exp $ 38 1.1 cgd */ 39 1.1 cgd 40 1.1 cgd #if defined(SYSLIBC_SCCS) && !defined(lint) 41 1.1 cgd .text 42 1.7 mycroft .asciz "$Id: brk.S,v 1.7 1994/01/27 06:35:00 mycroft Exp $" 43 1.1 cgd #endif /* SYSLIBC_SCCS and not lint */ 44 1.1 cgd 45 1.1 cgd #include "SYS.h" 46 1.1 cgd 47 1.1 cgd .globl curbrk 48 1.1 cgd .globl minbrk 49 1.7 mycroft #if 0 50 1.1 cgd ENTRY(_brk) 51 1.1 cgd jmp ok 52 1.7 mycroft #endif 53 1.1 cgd 54 1.1 cgd ENTRY(brk) 55 1.1 cgd #ifdef PIC 56 1.7 mycroft movl 4(%esp),%ecx 57 1.1 cgd PIC_PROLOGUE 58 1.7 mycroft movl PIC_GOT(minbrk),%edx 59 1.1 cgd PIC_EPILOGUE 60 1.7 mycroft cmpl %ecx,(%edx) 61 1.7 mycroft jl 1f 62 1.7 mycroft movl (%edx),%ecx 63 1.7 mycroft movl %ecx,4(%esp) 64 1.7 mycroft 1: 65 1.6 mycroft movl $(SYS_break),%eax 66 1.1 cgd LCALL(7,0) 67 1.7 mycroft jc err 68 1.7 mycroft PIC_PROLOGUE 69 1.7 mycroft movl PIC_GOT(curbrk),%edx # set up GOT addressing 70 1.7 mycroft PIC_EPILOGUE 71 1.4 jtc xorl %eax,%eax 72 1.7 mycroft movl %ecx,(%edx) 73 1.1 cgd ret 74 1.1 cgd err: 75 1.1 cgd jmp PIC_PLT(cerror) 76 1.1 cgd 77 1.1 cgd #else 78 1.1 cgd 79 1.7 mycroft movl 4(%esp),%ecx 80 1.7 mycroft cmpl %ecx,minbrk 81 1.7 mycroft jl 1f 82 1.7 mycroft movl minbrk,%ecx 83 1.7 mycroft movl %ecx,4(%esp) 84 1.7 mycroft 1: 85 1.6 mycroft movl $(SYS_break),%eax 86 1.1 cgd LCALL(7,0) 87 1.7 mycroft jc err 88 1.4 jtc xorl %eax,%eax 89 1.7 mycroft movl %ecx,curbrk 90 1.1 cgd ret 91 1.1 cgd err: 92 1.1 cgd jmp cerror 93 1.1 cgd #endif 94
Indexes created Fri Sep 26 20:09:58 GMT 2025