1*0a6a1f1dSLionel Sambuc/* $NetBSD: brk.S,v 1.1 2014/08/10 05:47:37 matt Exp $ */ 2*0a6a1f1dSLionel Sambuc 3*0a6a1f1dSLionel Sambuc/*- 4*0a6a1f1dSLionel Sambuc * Copyright (c) 2014 The NetBSD Foundation, Inc. 5*0a6a1f1dSLionel Sambuc * All rights reserved. 6*0a6a1f1dSLionel Sambuc * 7*0a6a1f1dSLionel Sambuc * This code is derived from software contributed to The NetBSD Foundation 8*0a6a1f1dSLionel Sambuc * by Matt Thomas of 3am Software Foundry. 9*0a6a1f1dSLionel Sambuc * 10*0a6a1f1dSLionel Sambuc * Redistribution and use in source and binary forms, with or without 11*0a6a1f1dSLionel Sambuc * modification, are permitted provided that the following conditions 12*0a6a1f1dSLionel Sambuc * are met: 13*0a6a1f1dSLionel Sambuc * 1. Redistributions of source code must retain the above copyright 14*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer. 15*0a6a1f1dSLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright 16*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer in the 17*0a6a1f1dSLionel Sambuc * documentation and/or other materials provided with the distribution. 18*0a6a1f1dSLionel Sambuc * 19*0a6a1f1dSLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20*0a6a1f1dSLionel Sambuc * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21*0a6a1f1dSLionel Sambuc * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22*0a6a1f1dSLionel Sambuc * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23*0a6a1f1dSLionel Sambuc * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24*0a6a1f1dSLionel Sambuc * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25*0a6a1f1dSLionel Sambuc * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26*0a6a1f1dSLionel Sambuc * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27*0a6a1f1dSLionel Sambuc * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28*0a6a1f1dSLionel Sambuc * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29*0a6a1f1dSLionel Sambuc * POSSIBILITY OF SUCH DAMAGE. 30*0a6a1f1dSLionel Sambuc */ 31*0a6a1f1dSLionel Sambuc 32*0a6a1f1dSLionel Sambuc#include "SYS.h" 33*0a6a1f1dSLionel Sambuc 34*0a6a1f1dSLionel Sambuc .globl _C_LABEL(_end) 35*0a6a1f1dSLionel Sambuc .globl _C_LABEL(__curbrk) 36*0a6a1f1dSLionel Sambuc 37*0a6a1f1dSLionel SambucWEAK_ALIAS(brk, _brk) 38*0a6a1f1dSLionel Sambuc 39*0a6a1f1dSLionel Sambuc .data 40*0a6a1f1dSLionel Sambuc .globl _C_LABEL(__minbrk) 41*0a6a1f1dSLionel Sambuc .hidden _C_LABEL(__minbrk) 42*0a6a1f1dSLionel Sambuc .type _C_LABEL(__minbrk),#object 43*0a6a1f1dSLionel Sambuc .align 3 44*0a6a1f1dSLionel Sambuc_C_LABEL(__minbrk): 45*0a6a1f1dSLionel Sambuc .xword _C_LABEL(_end) 46*0a6a1f1dSLionel Sambuc .size _C_LABEL(__minbrk), 8 47*0a6a1f1dSLionel Sambuc 48*0a6a1f1dSLionel Sambuc/* 49*0a6a1f1dSLionel Sambuc * Change the data segment size 50*0a6a1f1dSLionel Sambuc */ 51*0a6a1f1dSLionel SambucENTRY(_brk) 52*0a6a1f1dSLionel Sambuc adr x9, _C_LABEL(__minbrk) 53*0a6a1f1dSLionel Sambuc ldr x10, [x9, #:lo12:_C_LABEL(__minbrk)] 54*0a6a1f1dSLionel Sambuc 55*0a6a1f1dSLionel Sambuc /* 56*0a6a1f1dSLionel Sambuc * Valid the address specified and set to the minimum 57*0a6a1f1dSLionel Sambuc * if the address is below minbrk. 58*0a6a1f1dSLionel Sambuc */ 59*0a6a1f1dSLionel Sambuc cmp x0, x10 60*0a6a1f1dSLionel Sambuc csel x0, x10, x0, lt 61*0a6a1f1dSLionel Sambuc mov x11, x0 62*0a6a1f1dSLionel Sambuc SYSTRAP(break) 63*0a6a1f1dSLionel Sambuc _INVOKE_CERROR() 64*0a6a1f1dSLionel Sambuc 65*0a6a1f1dSLionel Sambuc /* Store the new address in curbrk */ 66*0a6a1f1dSLionel Sambuc adr x9, _C_LABEL(__curbrk) 67*0a6a1f1dSLionel Sambuc str x11, [x9, #:lo12:_C_LABEL(__curbrk)] 68*0a6a1f1dSLionel Sambuc 69*0a6a1f1dSLionel Sambuc /* Return 0 for success */ 70*0a6a1f1dSLionel Sambuc mov x0, xzr 71*0a6a1f1dSLionel Sambuc ret 72*0a6a1f1dSLionel SambucEND(_brk) 73