/* Definition for thread-local data handling.  nptl/x86_64 version.   Copyright (C) 2002,2003,2004,2005,2006,2007 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#ifndef _TLS_H#define _TLS_H	1#ifndef __ASSEMBLER__# include <asm/prctl.h>	/* For ARCH_SET_FS.  */# include <stdbool.h># include <stddef.h># include <stdint.h># include <stdlib.h>/* Type for the dtv.  */typedef union dtv{  size_t counter;  struct  {    void *val;    bool is_static;  } pointer;} dtv_t;typedef struct{  void *tcb;		/* Pointer to the TCB.  Not necessarily the			   thread descriptor used by libpthread.  */  dtv_t *dtv;  void *self;		/* Pointer to the thread descriptor.  */  int multiple_threads;  uintptr_t sysinfo;  uintptr_t stack_guard;  uintptr_t pointer_guard;  unsigned long int vgetcpu_cache[2];} tcbhead_t;#else /* __ASSEMBLER__ */# include <tcb-offsets.h>#endif/* We require TLS support in the tools.  */#ifndef HAVE_TLS_SUPPORT# error "TLS support is required."#endif/* Alignment requirement for the stack.  */#define STACK_ALIGN	16#ifndef __ASSEMBLER__/* Get system call information.  */# include <sysdep.h>/* Get the thread descriptor definition.  */# include <nptl/descr.h>#ifndef LOCK_PREFIX# ifdef UP#  define LOCK_PREFIX	/* nothing */# else#  define LOCK_PREFIX	"lock;"# endif#endif/* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),   because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole   struct pthread even when not linked with -lpthread.  */# define TLS_INIT_TCB_SIZE sizeof (struct pthread)/* Alignment requirements for the initial TCB.  */# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)/* This is the size of the TCB.  */# define TLS_TCB_SIZE sizeof (struct pthread)/* Alignment requirements for the TCB.  */# define TLS_TCB_ALIGN __alignof__ (struct pthread)/* The TCB can have any size and the memory following the address the   thread pointer points to is unspecified.  Allocate the TCB there.  */# define TLS_TCB_AT_TP	1/* Install the dtv pointer.  The pointer passed is to the element with   index -1 which contain the length.  */# define INSTALL_DTV(descr, dtvp) \  ((tcbhead_t *) (descr))->dtv = (dtvp) + 1/* Install new dtv for current thread.  */# define INSTALL_NEW_DTV(dtvp) \  ({ struct pthread *__pd;						      \     THREAD_SETMEM (__pd, header.dtv, (dtvp)); })/* Return dtv of given thread descriptor.  */# define GET_DTV(descr) \  (((tcbhead_t *) (descr))->dtv)/* Macros to load from and store into segment registers.  */# define TLS_GET_FS() \  ({ int __seg; __asm ("movl %%fs, %0" : "=q" (__seg)); __seg; })# define TLS_SET_FS(val) \  __asm ("movl %0, %%fs" :: "q" (val))/* Code to initially initialize the thread pointer.  This might need   special attention since 'errno' is not yet available and if the   operation can cause a failure 'errno' must not be touched.   We have to make the syscall for both uses of the macro since the   address might be (and probably is) different.  */# define TLS_INIT_TP(thrdescr, secondcall) \  ({ void *_thrdescr = (thrdescr);					      \     tcbhead_t *_head = _thrdescr;					      \     int _result;							      \									      \     _head->tcb = _thrdescr;						      \     /* For now the thread descriptor is at the same address.  */	      \     _head->self = _thrdescr;						      \									      \     /* It is a simple syscall to set the %fs value for the thread.  */	      \     asm volatile ("syscall"						      \		   : "=a" (_result)					      \		   : "0" ((unsigned long int) __NR_arch_prctl),		      \		     "D" ((unsigned long int) ARCH_SET_FS),		      \		     "S" (_thrdescr)					      \		   : "memory", "cc", "r11", "cx");			      \									      \    _result ? "cannot set %fs base address for thread-local storage" : 0;     \  })/* Return the address of the dtv for the current thread.  */# define THREAD_DTV() \  ({ struct pthread *__pd;						      \     THREAD_GETMEM (__pd, header.dtv); })/* Return the thread descriptor for the current thread.   The contained asm must *not* be marked volatile since otherwise   assignments like        pthread_descr self = thread_self();   do not get optimized away.  */# define THREAD_SELF \  ({ struct pthread *__self;						      \     asm ("movq %%fs:%c1,%q0" : "=r" (__self)				      \	  : "i" (offsetof (struct pthread, header.self)));	 	      \     __self;})/* Magic for libthread_db to know how to do THREAD_SELF.  */# define DB_THREAD_SELF_INCLUDE  <sys/reg.h> /* For the FS constant.  */# define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)/* Read member of the thread descriptor directly.  */# define THREAD_GETMEM(descr, member) \  ({ __typeof (descr->member) __value;					      \     if (sizeof (__value) == 1)						      \       asm volatile ("movb %%fs:%P2,%b0"				      \		     : "=q" (__value)					      \		     : "0" (0), "i" (offsetof (struct pthread, member)));     \     else if (sizeof (__value) == 4)					      \       asm volatile ("movl %%fs:%P1,%0"					      \		     : "=r" (__value)					      \		     : "i" (offsetof (struct pthread, member)));	      \     else								      \       {								      \	 if (sizeof (__value) != 8)					      \	   /* There should not be any value with a size other than 1,	      \	      4 or 8.  */						      \	   abort ();							      \									      \	 asm volatile ("movq %%fs:%P1,%q0"				      \		       : "=r" (__value)					      \		       : "i" (offsetof (struct pthread, member)));	      \       }								      \     __value; })/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */# define THREAD_GETMEM_NC(descr, member, idx) \  ({ __typeof (descr->member[0]) __value;				      \     if (sizeof (__value) == 1)						      \       asm volatile ("movb %%fs:%P2(%q3),%b0"				      \		     : "=q" (__value)					      \		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \		       "r" (idx));					      \     else if (sizeof (__value) == 4)					      \       asm volatile ("movl %%fs:%P1(,%q2,4),%0"				      \		     : "=r" (__value)					      \		     : "i" (offsetof (struct pthread, member[0])), "r" (idx));\     else								      \       {								      \	 if (sizeof (__value) != 8)					      \	   /* There should not be any value with a size other than 1,	      \	      4 or 8.  */						      \	   abort ();							      \									      \	 asm volatile ("movq %%fs:%P1(,%q2,8),%q0"			      \		       : "=r" (__value)					      \		       : "i" (offsetof (struct pthread, member[0])),	      \			 "r" (idx));					      \       }								      \     __value; })/* Loading addresses of objects on x86-64 needs to be treated special   when generating PIC code.  */#ifdef __pic__# define IMM_MODE "nr"#else# define IMM_MODE "ir"#endif/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */# define THREAD_SETMEM(descr, member, value) \  ({ if (sizeof (descr->member) == 1)					      \       asm volatile ("movb %b0,%%fs:%P1" :				      \		     : "iq" (value),					      \		       "i" (offsetof (struct pthread, member)));	      \     else if (sizeof (descr->member) == 4)				      \       asm volatile ("movl %0,%%fs:%P1" :				      \		     : IMM_MODE (value),				      \		       "i" (offsetof (struct pthread, member)));	      \     else								      \       {								      \	 if (sizeof (descr->member) != 8)				      \	   /* There should not be any value with a size other than 1,	      \	      4 or 8.  */						      \	   abort ();							      \									      \	 asm volatile ("movq %q0,%%fs:%P1" :				      \		       : IMM_MODE ((unsigned long int) value),		      \			 "i" (offsetof (struct pthread, member)));	      \       }})/* Set member of the thread descriptor directly.  */# define THREAD_SETMEM_NC(descr, member, idx, value) \  ({ if (sizeof (descr->member[0]) == 1)				      \       asm volatile ("movb %b0,%%fs:%P1(%q2)" :				      \		     : "iq" (value),					      \		       "i" (offsetof (struct pthread, member[0])),	      \		       "r" (idx));					      \     else if (sizeof (descr->member[0]) == 4)				      \       asm volatile ("movl %0,%%fs:%P1(,%q2,4)" :			      \		     : IMM_MODE (value),				      \		       "i" (offsetof (struct pthread, member[0])),	      \		       "r" (idx));					      \     else								      \       {								      \	 if (sizeof (descr->member[0]) != 8)				      \	   /* There should not be any value with a size other than 1,	      \	      4 or 8.  */						      \	   abort ();							      \									      \	 asm volatile ("movq %q0,%%fs:%P1(,%q2,8)" :			      \		       : IMM_MODE ((unsigned long int) value),		      \			 "i" (offsetof (struct pthread, member[0])),	      \			 "r" (idx));					      \       }})/* Atomic compare and exchange on TLS, returning old value.  */#define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, newval, oldval) \  ({ __typeof (descr->member) __ret;					      \     __typeof (oldval) __old = (oldval);				      \     if (sizeof (descr->member) == 4)					      \       asm volatile (LOCK_PREFIX "cmpxchgl %2, %%fs:%P3"		      \		     : "=a" (__ret)					      \		     : "0" (__old), "r" (newval),			      \		       "i" (offsetof (struct pthread, member)));	      \     else								      \       /* Not necessary for other sizes in the moment.  */		      \       abort ();							      \     __ret; })/* Atomic set bit.  */#define THREAD_ATOMIC_BIT_SET(descr, member, bit) \  (void) ({ if (sizeof ((descr)->member) == 4)				      \	      asm volatile (LOCK_PREFIX "orl %1, %%fs:%P0"		      \			    :: "i" (offsetof (struct pthread, member)),	      \			       "ir" (1 << (bit)));			      \	    else							      \	      /* Not necessary for other sizes in the moment.  */	      \	      abort (); })#define CALL_THREAD_FCT(descr) \  ({ void *__res;							      \     asm volatile ("movq %%fs:%P2, %%rdi\n\t"				      \		   "callq *%%fs:%P1"					      \		   : "=a" (__res)					      \		   : "i" (offsetof (struct pthread, start_routine)),	      \		     "i" (offsetof (struct pthread, arg))		      \		   : "di", "si", "cx", "dx", "r8", "r9", "r10", "r11",	      \		     "memory", "cc");					      \     __res; })/* Set the stack guard field in TCB head.  */# define THREAD_SET_STACK_GUARD(value) \    THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)# define THREAD_COPY_STACK_GUARD(descr) \    ((descr)->header.stack_guard					      \     = THREAD_GETMEM (THREAD_SELF, header.stack_guard))/* Set the pointer guard field in the TCB head.  */#define THREAD_SET_POINTER_GUARD(value) \  THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)#define THREAD_COPY_POINTER_GUARD(descr) \  ((descr)->header.pointer_guard					      \   = THREAD_GETMEM (THREAD_SELF, header.pointer_guard))#endif /* __ASSEMBLER__ */#endif	/* tls.h */