1/* $OpenBSD: sbrk.S,v 1.3 2012/08/22 17:19:35 pascal Exp $ */ 2/* $NetBSD: sbrk.S,v 1.7 2000/07/25 15:14:46 mycroft Exp $ */ 3 4/* 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#include <machine/asm.h> 38 39#include "SYS.h" 40 41 .globl _C_LABEL(__curbrk) 42 .globl _C_LABEL(_end) 43 44 .data 45 .align 8 46_C_LABEL(__curbrk): 47 .xword _C_LABEL(_end) 48 .text 49 50ENTRY(sbrk) 51#ifdef __PIC__ 52 PIC_PROLOGUE(%o5,%o4) 53 set _C_LABEL(__curbrk), %o3 54 ldx [%o5 + %o3], %o2 55 ldx [%o2], %o3 /* %o3 = old break */ 56 add %o3, %o0, %o4 /* %o4 = new break */ 57 mov %o4, %o0 /* copy for syscall */ 58 mov SYS_break, %g1 59 t ST_SYSCALL /* break(new_break) */ 60 bcc,a 1f /* if success, */ 61 mov %o3, %o0 /* set return value */ 62 ERROR() 631: 64 retl /* and update curbrk */ 65 stx %o4, [%o2] 66#else 67 sethi %hi(_C_LABEL(__curbrk)), %o2 68 ldx [%o2 + %lo(_C_LABEL(__curbrk))], %o3 /* %o3 = old break */ 69 add %o3, %o0, %o4 /* %o4 = new break */ 70 mov %o4, %o0 /* copy for syscall */ 71 mov SYS_break, %g1 72 t ST_SYSCALL /* break(new_break) */ 73 bcc,a 1f /* if success, */ 74 mov %o3, %o0 /* set return value */ 75 ERROR() 761: 77 retl /* and update curbrk */ 78 stx %o4, [%o2 + %lo(_C_LABEL(__curbrk))] 79#endif 80