1/* $OpenBSD: sbrk.S,v 1.6 2021/10/25 14:38:10 jca 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 __curbrk 42 .hidden __curbrk 43 .globl _C_LABEL(_end) 44 45 .data 46 .align 8 47__curbrk: 48 .xword _C_LABEL(_end) 49 END(__curbrk) 50 OTYPE(__curbrk) 51 .text 52 53ENTRY(sbrk) 54#ifdef __PIC__ 55 PIC_PROLOGUE(%o5,%o4) 56 set __curbrk, %o3 57 ldx [%o5 + %o3], %o2 58 ldx [%o2], %o3 /* %o3 = old break */ 59 add %o3, %o0, %o4 /* %o4 = new break */ 60 mov %o4, %o0 /* copy for syscall */ 61 mov SYS_break, %g1 62 t ST_SYSCALL /* break(new_break) */ 63 bcc,a 1f /* if success, */ 64 mov %o3, %o0 /* set return value */ 65 ERROR() 661: 67 retl /* and update curbrk */ 68 stx %o4, [%o2] 69#else 70 sethi %hi(__curbrk), %o2 71 ldx [%o2 + %lo(__curbrk)], %o3 /* %o3 = old break */ 72 add %o3, %o0, %o4 /* %o4 = new break */ 73 mov %o4, %o0 /* copy for syscall */ 74 mov SYS_break, %g1 75 t ST_SYSCALL /* break(new_break) */ 76 bcc,a 1f /* if success, */ 77 mov %o3, %o0 /* set return value */ 78 ERROR() 791: 80 retl /* and update curbrk */ 81 stx %o4, [%o2 + %lo(__curbrk)] 82#endif 83END(sbrk) 84 .weak sbrk 85