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      1 /* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:13 christos Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      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 #ifndef _RISCV_LWP_PRIVATE_H_
     32 #define _RISCV_LWP_PRIVATE_H_
     33 
     34 #include <sys/cdefs.h>
     35 #include <sys/tls.h>
     36 
     37 /*
     38  * On RISCV, since displacements are signed 12-bit values, the TCB Pointer
     39  * is biased by sizeof(tcb) so that first thread datum can be addressed by
     40  * -sizeof(tcb).
     41  */
     42 
     43 #define	TLS_TP_OFFSET	0x0
     44 #define	TLS_TCB_ALIGN	16
     45 #define	TLS_DTV_OFFSET	0x800
     46 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x800);
     47 
     48 __BEGIN_DECLS
     49 
     50 static __inline void *
     51 __lwp_getprivate_fast(void)
     52 {
     53 	void *__tp;
     54 	__asm("mv %0, tp" : "=r"(__tp));
     55 	return __tp;
     56 }
     57 
     58 static __inline void *
     59 __lwp_gettcb_fast(void)
     60 {
     61 	void *__tcb;
     62 
     63 	__asm __volatile(
     64 		"addi %[__tcb], tp, %[__offset]"
     65 	    :	[__tcb] "=r" (__tcb)
     66 	    :	[__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb))));
     67 
     68 	return __tcb;
     69 }
     70 
     71 static __inline void
     72 __lwp_settcb(void *__tcb)
     73 {
     74 	__asm __volatile(
     75 		"addi tp, %[__tcb], %[__offset]"
     76 	    :
     77 	    :	[__tcb] "r" (__tcb),
     78 		[__offset] "n" (TLS_TP_OFFSET + sizeof(struct tls_tcb)));
     79 }
     80 
     81 __END_DECLS
     82 
     83 #endif /* !_RISCV_LWP_PRIVATE_H_ */
     84