brk.S revision 1.21
1 1.21 ad /* $NetBSD: brk.S,v 1.21 2007/03/09 14:30:56 ad Exp $ */ 2 1.10 christos 3 1.1 cgd /*- 4 1.1 cgd * Copyright (c) 1990 The Regents of the University of California. 5 1.1 cgd * All rights reserved. 6 1.1 cgd * 7 1.1 cgd * This code is derived from software contributed to Berkeley by 8 1.1 cgd * William Jolitz. 9 1.1 cgd * 10 1.1 cgd * Redistribution and use in source and binary forms, with or without 11 1.1 cgd * modification, are permitted provided that the following conditions 12 1.1 cgd * are met: 13 1.1 cgd * 1. Redistributions of source code must retain the above copyright 14 1.1 cgd * notice, this list of conditions and the following disclaimer. 15 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 cgd * notice, this list of conditions and the following disclaimer in the 17 1.1 cgd * documentation and/or other materials provided with the distribution. 18 1.20 agc * 3. Neither the name of the University nor the names of its contributors 19 1.1 cgd * may be used to endorse or promote products derived from this software 20 1.1 cgd * without specific prior written permission. 21 1.1 cgd * 22 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.1 cgd * SUCH DAMAGE. 33 1.2 jtc * 34 1.2 jtc * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 35 1.1 cgd */ 36 1.1 cgd 37 1.10 christos #include <machine/asm.h> 38 1.1 cgd #if defined(SYSLIBC_SCCS) && !defined(lint) 39 1.21 ad RCSID("$NetBSD: brk.S,v 1.21 2007/03/09 14:30:56 ad Exp $") 40 1.1 cgd #endif /* SYSLIBC_SCCS and not lint */ 41 1.1 cgd 42 1.1 cgd #include "SYS.h" 43 1.1 cgd 44 1.8 mycroft .globl _end 45 1.11 kleink .globl _C_LABEL(__minbrk) 46 1.11 kleink .globl CURBRK 47 1.8 mycroft 48 1.16 kleink #ifdef WEAK_ALIAS 49 1.16 kleink WEAK_ALIAS(brk, _brk) 50 1.16 kleink #endif 51 1.16 kleink 52 1.8 mycroft .data 53 1.11 kleink _C_LABEL(__minbrk): 54 1.11 kleink .long _end 55 1.8 mycroft .text 56 1.1 cgd 57 1.15 kleink ENTRY(_brk) 58 1.1 cgd #ifdef PIC 59 1.7 mycroft movl 4(%esp),%ecx 60 1.1 cgd PIC_PROLOGUE 61 1.11 kleink movl PIC_GOT(_C_LABEL(__minbrk)),%edx 62 1.1 cgd PIC_EPILOGUE 63 1.7 mycroft cmpl %ecx,(%edx) 64 1.18 ross jb 1f 65 1.7 mycroft movl (%edx),%ecx 66 1.7 mycroft movl %ecx,4(%esp) 67 1.7 mycroft 1: 68 1.21 ad OSYSTRAP(break) /* don't clobber %ecx */ 69 1.7 mycroft jc err 70 1.7 mycroft PIC_PROLOGUE 71 1.11 kleink movl PIC_GOT(CURBRK),%edx # set up GOT addressing 72 1.7 mycroft PIC_EPILOGUE 73 1.14 mycroft movl %ecx,(%edx) 74 1.4 jtc xorl %eax,%eax 75 1.1 cgd ret 76 1.1 cgd err: 77 1.12 christos PIC_PROLOGUE 78 1.14 mycroft mov PIC_GOT(CERROR),%edx 79 1.13 mycroft PIC_EPILOGUE 80 1.19 ross jmp *%edx 81 1.1 cgd #else 82 1.7 mycroft movl 4(%esp),%ecx 83 1.11 kleink cmpl %ecx,_C_LABEL(__minbrk) 84 1.18 ross jb 1f 85 1.11 kleink movl _C_LABEL(__minbrk),%ecx 86 1.7 mycroft movl %ecx,4(%esp) 87 1.7 mycroft 1: 88 1.21 ad OSYSTRAP(break) /* don't clobber %ecx */ 89 1.7 mycroft jc err 90 1.14 mycroft movl %ecx,CURBRK 91 1.4 jtc xorl %eax,%eax 92 1.1 cgd ret 93 1.1 cgd err: 94 1.11 kleink jmp CERROR 95 1.1 cgd #endif 96
Indexes created Sun Sep 28 12:09:53 GMT 2025