/* $OpenBSD: sbrk.S,v 1.8 2016/05/30 05:18:52 guenther Exp $ */ /* $NetBSD: sbrk.S,v 1.7 2003/08/07 16:42:05 agc Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 */ #include "SYS.h" .globl _C_LABEL(_end) .data .align 0 .globl __curbrk .type __curbrk,#object .hidden __curbrk __curbrk: .word _C_LABEL(_end) END(__curbrk) .weak sbrk /* * Change the data segment size */ ENTRY(sbrk) #ifdef __PIC__ /* Setup the GOT */ ldr r3, .Lgot ldr r2, .Lcurbrk .L1: add r3, pc, r3 ldr r2, [r3, r2] #else ldr r2, .Lcurbrk #endif /* Get the current brk address */ ldr r1, [r2] /* Calculate new value */ mov r3, r0 add r0, r0, r1 SYSTRAP(break) bcs PIC_SYM(CERROR, PLT) /* Store new curbrk value */ ldr r0, [r2] add r1, r0, r3 str r1, [r2] /* Return old curbrk value */ mov r15, r14 .align 0 #ifdef __PIC__ .Lgot: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (.L1+8) #endif .Lcurbrk: .word PIC_SYM(__curbrk, GOT) END(sbrk)