1/* $NetBSD: sbrk.S,v 1.10 2013/09/12 15:36:16 joerg Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 36 */ 37 38#include <machine/asm.h> 39#if defined(SYSLIBC_SCCS) && !defined(lint) 40#if 0 41 .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93" 42#else 43 RCSID("$NetBSD: sbrk.S,v 1.10 2013/09/12 15:36:16 joerg Exp $") 44#endif 45#endif /* SYSLIBC_SCCS and not lint */ 46 47#include "SYS.h" 48 49 .globl _C_LABEL(__curbrk) 50 .globl _C_LABEL(_end) 51 52#ifdef WEAK_ALIAS 53WEAK_ALIAS(sbrk, _sbrk) 54#endif 55 56 .data 57 .align 8 58_C_LABEL(__curbrk): 59 .xword _C_LABEL(_end) 60 .text 61 62#if __PIC__ - 0 >= 2 63 64ENTRY(_sbrk) 65 PIC_PROLOGUE(%o5,%o4) 66 set _C_LABEL(__curbrk), %o3 67 ldx [%o5 + %o3], %o2 68 ldx [%o2], %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] 79 80#elif __PIC__ - 0 >= 1 81 82ENTRY(_sbrk) 83 PIC_PROLOGUE(%o5,%o4) 84 ldx [%o5 + _C_LABEL(__curbrk)], %o2 85 ldx [%o2], %o3 /* %o3 = old break */ 86 add %o3, %o0, %o4 /* %o4 = new break */ 87 mov %o4, %o0 /* copy for syscall */ 88 mov SYS_break, %g1 89 t ST_SYSCALL /* break(new_break) */ 90 bcc,a 1f /* if success, */ 91 mov %o3, %o0 /* set return value */ 92 ERROR() 931: 94 retl /* and update curbrk */ 95 stx %o4, [%o2] 96 97#else 98 99ENTRY(_sbrk) 100 sethi %hi(_C_LABEL(__curbrk)), %o2 101 ldx [%o2 + %lo(_C_LABEL(__curbrk))], %o3 /* %o3 = old break */ 102 add %o3, %o0, %o4 /* %o4 = new break */ 103 mov %o4, %o0 /* copy for syscall */ 104 mov SYS_break, %g1 105 t ST_SYSCALL /* break(new_break) */ 106 bcc,a 1f /* if success, */ 107 mov %o3, %o0 /* set return value */ 108 ERROR() 1091: 110 retl /* and update curbrk */ 111 stx %o4, [%o2 + %lo(_C_LABEL(__curbrk))] 112 113#endif /* __PIC__ */ 114