1 /* $NetBSD: pthread_md.h,v 1.7 2007/11/13 17:20:10 ad 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 Nathan J. Williams. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 * 38 * Adapted for x86_64 by fvdl@NetBSD.org 39 */ 40 41 #ifndef _LIB_PTHREAD_X86_64_MD_H 42 #define _LIB_PTHREAD_X86_64_MD_H 43 44 #include <sys/ucontext.h> 45 46 static inline long 47 pthread__sp(void) 48 { 49 long ret; 50 __asm("movq %%rsp, %0" : "=g" (ret)); 51 52 return ret; 53 } 54 55 #define pthread__uc_sp(ucp) ((ucp)->uc_mcontext.__gregs[_REG_URSP]) 56 #define pthread__uc_pc(ucp) ((ucp)->uc_mcontext.__gregs[_REG_RIP]) 57 58 /* 59 * Set initial, sane values for registers whose values aren't just 60 * "don't care". 61 * 0x23 is GSEL(GUDATA_SEL, SEL_UPL), and 62 * 0x1b is GSEL(GUCODE_SEL, SEL_UPL). 63 * 0x202 is PSL_USERSET. 64 */ 65 #define _INITCONTEXT_U_MD(ucp) \ 66 (ucp)->uc_mcontext.__gregs[_REG_GS] = 0x23, \ 67 (ucp)->uc_mcontext.__gregs[_REG_FS] = 0x23, \ 68 (ucp)->uc_mcontext.__gregs[_REG_ES] = 0x23, \ 69 (ucp)->uc_mcontext.__gregs[_REG_DS] = 0x23, \ 70 (ucp)->uc_mcontext.__gregs[_REG_CS] = 0x1b, \ 71 (ucp)->uc_mcontext.__gregs[_REG_SS] = 0x23, \ 72 (ucp)->uc_mcontext.__gregs[_REG_RFL] = 0x202; 73 74 /* 75 * Usable stack space below the ucontext_t. 76 * See comment in pthread_switch.S about STACK_SWITCH. 77 */ 78 #define STACKSPACE 64 /* room for 8 long values */ 79 80 /* 81 * Conversions between struct reg and struct mcontext. Used by 82 * libpthread_dbg. 83 */ 84 85 #define PTHREAD_UCONTEXT_TO_REG(reg, uc) \ 86 memcpy(reg, (uc)->uc_mcontext.__gregs, _NGREG * sizeof (long)); 87 88 #define PTHREAD_REG_TO_UCONTEXT(uc, reg) do { \ 89 memcpy((uc)->uc_mcontext.__gregs, reg, _NGREG * sizeof (long)); \ 90 (uc)->uc_flags = ((uc)->uc_flags | _UC_CPU) & ~_UC_USER; \ 91 } while (/*CONSTCOND*/0) 92 93 94 #define PTHREAD_UCONTEXT_TO_FPREG(freg, uc) \ 95 (void)memcpy(&(freg)->fxstate, \ 96 (uc)->uc_mcontext.__fpregs, sizeof(struct fpreg)) 97 98 #define PTHREAD_FPREG_TO_UCONTEXT(uc, freg) do { \ 99 (void)memcpy( \ 100 (uc)->uc_mcontext.__fpregs, \ 101 &(freg)->fxstate, sizeof(struct fpreg)); \ 102 /*LINTED precision loss */ \ 103 (uc)->uc_flags = ((uc)->uc_flags | _UC_FPU) & ~_UC_USER; \ 104 } while (/*CONSTCOND*/0) 105 106 #define pthread__smt_pause() __asm __volatile("rep; nop" ::: "memory") 107 #define PTHREAD__HAVE_ATOMIC 108 109 static inline void * 110 pthread__atomic_cas_ptr(volatile void *ptr, const void *old, const void *new) 111 { 112 volatile uintptr_t *cast = ptr; 113 void *ret; 114 115 __asm __volatile ("lock; cmpxchgq %2, %1" 116 : "=a" (ret), "=m" (*cast) 117 : "r" (new), "m" (*cast), "0" (old)); 118 119 return ret; 120 } 121 122 static inline void * 123 pthread__atomic_cas_ptr_ni(volatile void *ptr, const void *old, const void *new) 124 { 125 volatile uintptr_t *cast = ptr; 126 void *ret; 127 128 __asm __volatile ("cmpxchgq %2, %1" 129 : "=a" (ret), "=m" (*cast) 130 : "r" (new), "m" (*cast), "0" (old)); 131 132 return ret; 133 } 134 135 #endif /* _LIB_PTHREAD_X86_64_MD_H */ 136