brk.S revision 1.4
11.4Sjoerg/* $NetBSD: brk.S,v 1.4 2011/11/18 20:43:01 joerg Exp $ */ 21.1Sfvdl 31.1Sfvdl/*- 41.1Sfvdl * Copyright (c) 1990 The Regents of the University of California. 51.1Sfvdl * All rights reserved. 61.1Sfvdl * 71.1Sfvdl * This code is derived from software contributed to Berkeley by 81.1Sfvdl * William Jolitz. 91.1Sfvdl * 101.1Sfvdl * Redistribution and use in source and binary forms, with or without 111.1Sfvdl * modification, are permitted provided that the following conditions 121.1Sfvdl * are met: 131.1Sfvdl * 1. Redistributions of source code must retain the above copyright 141.1Sfvdl * notice, this list of conditions and the following disclaimer. 151.1Sfvdl * 2. Redistributions in binary form must reproduce the above copyright 161.1Sfvdl * notice, this list of conditions and the following disclaimer in the 171.1Sfvdl * documentation and/or other materials provided with the distribution. 181.3Sagc * 3. Neither the name of the University nor the names of its contributors 191.1Sfvdl * may be used to endorse or promote products derived from this software 201.1Sfvdl * without specific prior written permission. 211.1Sfvdl * 221.1Sfvdl * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231.1Sfvdl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241.1Sfvdl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251.1Sfvdl * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261.1Sfvdl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271.1Sfvdl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281.1Sfvdl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291.1Sfvdl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301.1Sfvdl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311.1Sfvdl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321.1Sfvdl * SUCH DAMAGE. 331.1Sfvdl * 341.1Sfvdl * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 351.1Sfvdl */ 361.1Sfvdl 371.1Sfvdl#include <machine/asm.h> 381.1Sfvdl#if defined(SYSLIBC_SCCS) && !defined(lint) 391.4Sjoerg RCSID("$NetBSD: brk.S,v 1.4 2011/11/18 20:43:01 joerg Exp $") 401.1Sfvdl#endif /* SYSLIBC_SCCS and not lint */ 411.1Sfvdl 421.1Sfvdl#include "SYS.h" 431.1Sfvdl 441.1Sfvdl .globl _end 451.1Sfvdl .globl _C_LABEL(__minbrk) 461.1Sfvdl .globl CURBRK 471.1Sfvdl 481.1Sfvdl#ifdef WEAK_ALIAS 491.1SfvdlWEAK_ALIAS(brk, _brk) 501.1Sfvdl#endif 511.1Sfvdl 521.1Sfvdl .data 531.1Sfvdl_C_LABEL(__minbrk): 541.1Sfvdl .quad _end 551.1Sfvdl .text 561.1Sfvdl 571.1SfvdlENTRY(_brk) 581.1Sfvdl#ifdef PIC 591.1Sfvdl movq PIC_GOT(_C_LABEL(__minbrk)),%rdx 601.1Sfvdl cmpq %rdi,(%rdx) 611.1Sfvdl jb 1f 621.1Sfvdl movq (%rdx),%rdi 631.1Sfvdl1: 641.1Sfvdl SYSTRAP(break) 651.1Sfvdl jc err 661.1Sfvdl movq PIC_GOT(CURBRK),%rdx # set up GOT addressing 671.2Sfvdl movq %rdi,(%rdx) 681.1Sfvdl xorl %eax,%eax 691.1Sfvdl ret 701.1Sfvdlerr: 711.4Sjoerg jmp CERROR 721.1Sfvdl#else 731.1Sfvdl cmpq %rdi,_C_LABEL(__minbrk)(%rip) 741.1Sfvdl jb 1f 751.1Sfvdl movq _C_LABEL(__minbrk)(%rip),%rdi 761.1Sfvdl1: 771.1Sfvdl SYSTRAP(break) 781.1Sfvdl jc err 791.1Sfvdl movq %rdi,CURBRK(%rip) 801.1Sfvdl xorl %eax,%eax 811.1Sfvdl ret 821.1Sfvdlerr: 831.1Sfvdl jmp CERROR 841.1Sfvdl#endif 85