1/* $NetBSD: brk.S,v 1.6 2003/08/07 16:42:04 agc Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 32 */ 33 34#include <machine/asm.h> 35__FBSDID("$FreeBSD$"); 36#include "SYS.h" 37 38 .globl _C_LABEL(_end) 39 .globl CURBRK 40 41#ifdef WEAK_ALIAS 42WEAK_ALIAS(brk, _brk) 43#endif 44 45 .data 46 .align 0 47 .globl _C_LABEL(minbrk) 48 .type _C_LABEL(minbrk),#object 49_C_LABEL(minbrk): 50 .word _C_LABEL(_end) 51 52/* 53 * Change the data segment size 54 */ 55ENTRY(_brk) 56 /* Setup the GOT */ 57 GOT_INIT(r3, .Lgot, .L1) 58 GOT_GET(r1, r3, .Lminbrk) 59 60 /* Get the minimum allowable brk address */ 61 ldr r1, [r1] 62 63 /* 64 * Valid the address specified and set to the minimum 65 * if the address is below minbrk. 66 */ 67 cmp r0, r1 68 it lt 69 movlt r0, r1 70 mov r2, r0 71 SYSTRAP(break) 72 bcs PIC_SYM(CERROR, PLT) 73 74#ifdef PIC 75 ldr r1, .Lcurbrk 76 ldr r1, [r3, r1] 77#else 78 ldr r1, .Lcurbrk 79#endif 80 /* Store the new address in curbrk */ 81 str r2, [r1] 82 83 /* Return 0 for success */ 84 mov r0, #0x00000000 85 RET 86 87 .align 2 88 GOT_INITSYM(.Lgot, .L1) 89.Lminbrk: 90 .word PIC_SYM(_C_LABEL(minbrk), GOT) 91.Lcurbrk: 92 .word PIC_SYM(CURBRK, GOT) 93END(_brk) 94 95 .section .note.GNU-stack,"",%progbits 96