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pthread_md.h revision 1.5 
      1 /*	$NetBSD: pthread_md.h,v 1.5 2007/09/07 00:24:57 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 (at) 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__CHEAP_UNLOCK
    108 #define	PTHREAD__HAVE_ATOMIC
    109 
    110 #endif /* _LIB_PTHREAD_X86_64_MD_H */
    111