1 /* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:11 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein, and by Jason R. Thorpe of Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _MIPS_LWP_PRIVATE_H_ 33 #define _MIPS_LWP_PRIVATE_H_ 34 35 #include <lwp.h> 36 #include <sys/cdefs.h> 37 #include <sys/tls.h> 38 39 #define TLS_TP_OFFSET 0x7000 40 #define TLS_DTV_OFFSET 0x8000 41 42 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000); 43 __CTASSERT(TLS_TP_OFFSET % sizeof(struct tls_tcb) == 0); 44 45 __BEGIN_DECLS 46 47 static __inline struct tls_tcb * 48 __lwp_gettcb_fast(void) 49 { 50 struct tls_tcb *__tcb; 51 52 /* 53 * Only emit a rdhwr $3, $29 so the kernel can quickly emulate it. 54 */ 55 __asm __volatile( 56 #if 1 57 // For some reason the syscall is much faster than 58 // emulating rdhwr $3,$29 on a CN50xx 59 "addiu $2,$0,316; syscall; nop; move %[__tcb],$2" 60 #else 61 ".set push" 62 ";.set mips32r2" 63 ";.p2align 4" 64 ";ssnop" 65 ";rdhwr $3,$29" 66 ";ssnop" 67 ";move %0,$3" 68 ";.set pop" 69 #endif 70 : [__tcb]"=r"(__tcb) 71 : 72 : "v0", "v1", "a3"); 73 return __tcb - (TLS_TP_OFFSET / sizeof(*__tcb) + 1); 74 } 75 76 void _lwp_setprivate(void *); 77 78 static inline void 79 __lwp_settcb(struct tls_tcb *__tcb) 80 { 81 __tcb += TLS_TP_OFFSET / sizeof(*__tcb) + 1; 82 _lwp_setprivate(__tcb); 83 } 84 85 __END_DECLS 86 87 #endif /* _MIPS_LWP_PRIVATE_H_ */ 88