/* $NetBSD: pthread_md.h,v 1.12.46.1 2023/08/04 13:04:03 martin Exp $ */ /*- * Copyright (c) 2001, 2007, 2008 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Nathan J. Williams. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Adapted for x86_64 by fvdl@NetBSD.org */ #ifndef _LIB_PTHREAD_X86_64_MD_H #define _LIB_PTHREAD_X86_64_MD_H #include static inline unsigned long pthread__sp(void) { unsigned long ret; __asm("movq %%rsp, %0" : "=g" (ret)); return ret; } #define pthread__uc_sp(ucp) ((ucp)->uc_mcontext.__gregs[_REG_URSP]) /* * Set initial, sane values for registers whose values aren't just * "don't care". * 0x23 is GSEL(GUDATA_SEL, SEL_UPL), and * 0x1b is GSEL(GUCODE_SEL, SEL_UPL). * 0x202 is PSL_USERSET. */ #define _INITCONTEXT_U_MD(ucp) \ (ucp)->uc_mcontext.__gregs[_REG_GS] = 0x23, \ (ucp)->uc_mcontext.__gregs[_REG_FS] = 0x23, \ (ucp)->uc_mcontext.__gregs[_REG_ES] = 0x23, \ (ucp)->uc_mcontext.__gregs[_REG_DS] = 0x23, \ (ucp)->uc_mcontext.__gregs[_REG_CS] = 0x1b, \ (ucp)->uc_mcontext.__gregs[_REG_SS] = 0x23, \ (ucp)->uc_mcontext.__gregs[_REG_RFL] = 0x202; #define pthread__smt_pause() __asm __volatile("rep; nop" ::: "memory") #define pthread__smt_wait() __asm __volatile("rep; nop" ::: "memory") /* Don't need additional memory barriers. */ #define PTHREAD__ATOMIC_IS_MEMBAR static inline void * _atomic_cas_ptr(volatile void *ptr, void *old, void *new) { volatile uintptr_t *cast = ptr; void *ret; __asm __volatile ("lock; cmpxchgq %2, %1" : "=a" (ret), "=m" (*cast) : "r" (new), "m" (*cast), "0" (old)); return ret; } static inline void * _atomic_cas_ptr_ni(volatile void *ptr, void *old, void *new) { volatile uintptr_t *cast = ptr; void *ret; __asm __volatile ("cmpxchgq %2, %1" : "=a" (ret), "=m" (*cast) : "r" (new), "m" (*cast), "0" (old)); return ret; } #endif /* _LIB_PTHREAD_X86_64_MD_H */