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pthread_md.h revision 1.10.8.2 
      1 /*	$NetBSD: pthread_md.h,v 1.10.8.2 2008/04/28 20:23:03 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2007, 2008 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  *
     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  * Adapted for x86_64 by fvdl (at) NetBSD.org
     32  */
     33 
     34 #ifndef _LIB_PTHREAD_X86_64_MD_H
     35 #define _LIB_PTHREAD_X86_64_MD_H
     36 
     37 #include <sys/ucontext.h>
     38 
     39 static inline long
     40 pthread__sp(void)
     41 {
     42 	long ret;
     43 	__asm("movq %%rsp, %0" : "=g" (ret));
     44 
     45 	return ret;
     46 }
     47 
     48 #define pthread__uc_sp(ucp) ((ucp)->uc_mcontext.__gregs[_REG_URSP])
     49 #define pthread__uc_pc(ucp) ((ucp)->uc_mcontext.__gregs[_REG_RIP])
     50 
     51 /*
     52  * Set initial, sane values for registers whose values aren't just
     53  * "don't care".
     54  * 0x23 is GSEL(GUDATA_SEL, SEL_UPL), and
     55  * 0x1b is GSEL(GUCODE_SEL, SEL_UPL).
     56  * 0x202 is PSL_USERSET.
     57  */
     58 #define _INITCONTEXT_U_MD(ucp)						\
     59 	(ucp)->uc_mcontext.__gregs[_REG_GS] = 0x23,			\
     60 	(ucp)->uc_mcontext.__gregs[_REG_FS] = 0x23,			\
     61 	(ucp)->uc_mcontext.__gregs[_REG_ES] = 0x23,			\
     62 	(ucp)->uc_mcontext.__gregs[_REG_DS] = 0x23,			\
     63 	(ucp)->uc_mcontext.__gregs[_REG_CS] = 0x1b,			\
     64 	(ucp)->uc_mcontext.__gregs[_REG_SS] = 0x23,			\
     65 	(ucp)->uc_mcontext.__gregs[_REG_RFL] = 0x202;
     66 
     67 /*
     68  * Usable stack space below the ucontext_t.
     69  * See comment in pthread_switch.S about STACK_SWITCH.
     70  */
     71 #define STACKSPACE	64	/* room for 8 long values */
     72 
     73 /*
     74  * Conversions between struct reg and struct mcontext. Used by
     75  * libpthread_dbg.
     76  */
     77 
     78 #define PTHREAD_UCONTEXT_TO_REG(reg, uc) \
     79 	memcpy(reg, (uc)->uc_mcontext.__gregs, _NGREG * sizeof (long));
     80 
     81 #define PTHREAD_REG_TO_UCONTEXT(uc, reg) do {				\
     82 	memcpy((uc)->uc_mcontext.__gregs, reg, _NGREG * sizeof (long)); \
     83 	(uc)->uc_flags = ((uc)->uc_flags | _UC_CPU) & ~_UC_USER; 	\
     84 	} while (/*CONSTCOND*/0)
     85 
     86 
     87 #define PTHREAD_UCONTEXT_TO_FPREG(freg, uc)		       		\
     88 	(void)memcpy(&(freg)->fxstate,					\
     89         (uc)->uc_mcontext.__fpregs, sizeof(struct fpreg))
     90 
     91 #define PTHREAD_FPREG_TO_UCONTEXT(uc, freg) do {       	       		\
     92 	(void)memcpy(							\
     93         (uc)->uc_mcontext.__fpregs,					\
     94 	&(freg)->fxstate, sizeof(struct fpreg));			\
     95 	/*LINTED precision loss */					\
     96 	(uc)->uc_flags = ((uc)->uc_flags | _UC_FPU) & ~_UC_USER;	\
     97 	} while (/*CONSTCOND*/0)
     98 
     99 #define	pthread__smt_pause()	__asm __volatile("rep; nop" ::: "memory")
    100 
    101 /* Don't need additional memory barriers. */
    102 #define	PTHREAD__ATOMIC_IS_MEMBAR
    103 
    104 static inline void *
    105 _atomic_cas_ptr(volatile void *ptr, void *old, void *new)
    106 {
    107 	volatile uintptr_t *cast = ptr;
    108 	void *ret;
    109 
    110 	__asm __volatile ("lock; cmpxchgq %2, %1"
    111 		: "=a" (ret), "=m" (*cast)
    112 		: "r" (new), "m" (*cast), "0" (old));
    113 
    114 	return ret;
    115 }
    116 
    117 static inline void *
    118 _atomic_cas_ptr_ni(volatile void *ptr, void *old, void *new)
    119 {
    120 	volatile uintptr_t *cast = ptr;
    121 	void *ret;
    122 
    123 	__asm __volatile ("cmpxchgq %2, %1"
    124 		: "=a" (ret), "=m" (*cast)
    125 		: "r" (new), "m" (*cast), "0" (old));
    126 
    127 	return ret;
    128 }
    129 
    130 #endif /* _LIB_PTHREAD_X86_64_MD_H */
    131