1 /* $NetBSD: lwp_private.h,v 1.1 2024/11/30 01:04:13 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 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. 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 _POWERPC_LWP_PRIVATE_H_ 33 #define _POWERPC_LWP_PRIVATE_H_ 34 35 #include <sys/cdefs.h> 36 #include <sys/tls.h> 37 38 #include <lwp.h> 39 40 /* 41 * On PowerPC, since displacements are signed 16-bit values, the TCB Pointer 42 * is biased by 0x7000 + sizeof(tcb) so that first thread datum can be 43 * addressed by -28672 thereby leaving 60KB available for use as thread data. 44 */ 45 #define TLS_TP_OFFSET 0x7000 46 #define TLS_DTV_OFFSET 0x8000 47 __CTASSERT(TLS_TP_OFFSET + sizeof(struct tls_tcb) < 0x8000); 48 49 __BEGIN_DECLS 50 51 static __inline void * 52 __lwp_gettcb_fast(void) 53 { 54 void *__tcb; 55 56 __asm __volatile( 57 "addi %[__tcb],%%r2,%[__offset]" 58 : [__tcb] "=r" (__tcb) 59 : [__offset] "n" (-(TLS_TP_OFFSET + sizeof(struct tls_tcb)))); 60 61 return __tcb; 62 } 63 64 static __inline void 65 __lwp_settcb(void *__tcb) 66 { 67 __tcb = (uint8_t *)__tcb + TLS_TP_OFFSET + sizeof(struct tls_tcb); 68 69 __asm __volatile( 70 "mr %%r2,%[__tcb]" 71 : 72 : [__tcb] "r" (__tcb)); 73 74 _lwp_setprivate(__tcb); 75 } 76 77 __END_DECLS 78 79 #endif /* !_POWERPC_LWP_PRIVATE_H_ */ 80