/* Definitions for thread-local data handling.  linuxthreads/x86-64 version.   Copyright (C) 2002, 2005 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#ifndef __ASSEMBLER__# include <pt-machine.h># include <stdbool.h># include <stddef.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 necessary the			   thread descriptor used by libpthread.  */  dtv_t *dtv;  void *self;		/* Pointer to the thread descriptor.  */  int multiple_threads;} tcbhead_t;#else /* __ASSEMBLER__ */# include <tcb-offsets.h>#endif#ifdef HAVE_TLS_SUPPORT/* Signal that TLS support is available.  */# define USE_TLS	1# ifndef __ASSEMBLER__/* Get system call information.  */#  include <sysdep.h>/* Get the thread descriptor definition.  */#  include <linuxthreads/descr.h>/* This is the size of the initial TCB.  */#  define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)/* Alignment requirements for the initial TCB.  */#  define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)/* This is the size of the TCB.  */#  define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct)/* Alignment requirements for the TCB.  */#  define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)/* 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(dtv) \  ({ struct _pthread_descr_struct *__descr;				      \     THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); })/* Return dtv of given thread descriptor.  */#  define GET_DTV(descr) \  (((tcbhead_t *) (descr))->dtv)/* 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.  */# define TLS_INIT_TP(descr, secondcall)					      \  ({									      \    void *_descr = (descr);						      \    tcbhead_t *head = _descr;						      \    long int _result;							      \									      \    head->tcb = _descr;							      \    /* For now the thread descriptor is at the same address.  */	      \    head->self = _descr;						      \									      \    asm volatile ("syscall"						      \		  : "=a" (_result)					      \		  : "0" ((unsigned long int) __NR_arch_prctl),		      \		    "D" ((unsigned long int) ARCH_SET_FS),		      \		    "S" (_descr)					      \		  : "memory", "cc", "r11", "cx");			      \									      \    _result ? "cannot set %fs base address for thread-local storage" : 0;     \  })/* Indicate that dynamic linker shouldn't try to initialize TLS even   when no PT_TLS segments are found in the program and libraries   it is linked against.  */#  define TLS_INIT_TP_EXPENSIVE 1/* Return the address of the dtv for the current thread.  */#  define THREAD_DTV() \  ({ struct _pthread_descr_struct *__descr;				      \     THREAD_GETMEM (__descr, p_header.data.dtvp); })# endif	/* HAVE_TLS_SUPPORT */#endif /* __ASSEMBLER__ */#endif	/* tls.h */