1/* $NetBSD: atomic_swap.S,v 1.8 2022/02/27 19:21:53 riastradh Exp $ */ 2 3/*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <machine/asm.h> 30#include "atomic_op_asm.h" 31 32RCSID("$NetBSD: atomic_swap.S,v 1.8 2022/02/27 19:21:53 riastradh Exp $") 33 34 .text 35 .set noreorder 36#ifdef _KERNEL_OPT 37#include "opt_cputype.h" 38#ifndef MIPS3_LOONGSON2F 39 .set noat 40 .set nomacro 41#endif 42#else /* _KERNEL_OPT */ 43 .set noat 44 .set nomacro 45#endif /* _KERNEL_OPT */ 46 47LEAF(_atomic_swap_32) 48 LLSCSYNC 491: INT_LL v0, 0(a0) 50 nop 51 move t0, a1 52 INT_SC t0, 0(a0) 53 beq t0, zero, 1b 54 nop 552: 56 j ra 57 BDSYNC_PLUNGER 58END(_atomic_swap_32) 59ATOMIC_OP_ALIAS(atomic_swap_32, _atomic_swap_32) 60 61#if !defined(__mips_o32) 62LEAF(_atomic_swap_64) 63 LLSCSYNC 641: REG_LL v0, 0(a0) 65 nop 66 move t0, a1 67 REG_SC t0, 0(a0) 68 beq t0, zero, 1b 69 nop 702: 71 j ra 72 BDSYNC_PLUNGER 73END(_atomic_swap_64) 74ATOMIC_OP_ALIAS(atomic_swap_64, _atomic_swap_64) 75#endif 76 77#ifdef _LP64 78STRONG_ALIAS(_atomic_swap_ptr, _atomic_swap_64) 79STRONG_ALIAS(_atomic_swap_ulong, _atomic_swap_64) 80#else 81STRONG_ALIAS(_atomic_swap_ptr, _atomic_swap_32) 82STRONG_ALIAS(_atomic_swap_ulong, _atomic_swap_32) 83#endif 84STRONG_ALIAS(_atomic_swap_uint, _atomic_swap_32) 85 86ATOMIC_OP_ALIAS(atomic_swap_ptr, _atomic_swap_ptr) 87ATOMIC_OP_ALIAS(atomic_swap_uint, _atomic_swap_uint) 88ATOMIC_OP_ALIAS(atomic_swap_ulong, _atomic_swap_ulong) 89