/* Definition for thread-local data handling.  NPTL/SH version.   Copyright (C) 2003, 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# include <dl-sysdep.h>#ifndef __ASSEMBLER__# include <stdbool.h># include <stddef.h># include <stdint.h># include <stdlib.h># include <list.h># include <sysdep.h># include <kernel-features.h>/* Type for the dtv.  */typedef union dtv{  size_t counter;  struct  {    void *val;    bool is_static;  } pointer;} dtv_t;typedef struct{  dtv_t *dtv;  uintptr_t pointer_guard;} tcbhead_t;# define TLS_MULTIPLE_THREADS_IN_TCB 1#else /* __ASSEMBLER__ */# include <tcb-offsets.h>#endif /* __ASSEMBLER__ *//* We require TLS support in the tools.  */#ifndef HAVE_TLS_SUPPORT# error "TLS support is required."#endif#ifndef __ASSEMBLER__/* Get system call information.  */# include <sysdep.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 (tcbhead_t)/* This is the size we need before TCB.  */# define TLS_PRE_TCB_SIZE sizeof (struct pthread)/* Alignment requirements for the TCB.  */# define TLS_TCB_ALIGN __alignof__ (struct pthread)/* The TLS blocks start right after the TCB.  */# define TLS_DTV_AT_TP	1/* Get the thread descriptor definition.  */# include <nptl/descr.h>/* Install the dtv pointer.  The pointer passed is to the element with   index -1 which contain the length.  */# define INSTALL_DTV(tcbp, dtvp) \  ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1/* Install new dtv for current thread.  */# define INSTALL_NEW_DTV(dtv) \  ({ tcbhead_t *__tcbp;							      \     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \     __tcbp->dtv = (dtv);})/* Return dtv of given thread descriptor.  */# define GET_DTV(tcbp) \  (((tcbhead_t *) (tcbp))->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(tcbp, secondcall) \  ({ __asm __volatile ("ldc %0,gbr" : : "r" (tcbp)); 0; })/* Return the address of the dtv for the current thread.  */# define THREAD_DTV() \  ({ tcbhead_t *__tcbp;							      \     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \     __tcbp->dtv;})/* Return the thread descriptor for the current thread.   The contained asm must *not* be marked volatile since otherwise   assignments like        struct pthread *self = thread_self();   do not get optimized away.  */# define THREAD_SELF \  ({ struct pthread *__self;						      \     __asm ("stc gbr,%0" : "=r" (__self));				      \     __self - 1;})/* Magic for libthread_db to know how to do THREAD_SELF.  */# define DB_THREAD_SELF \  REGISTER (32, 32, REG_GBR * 4, -sizeof (struct pthread))/* Read member of the thread descriptor directly.  */# define THREAD_GETMEM(descr, member) (descr->member)/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */# define THREAD_GETMEM_NC(descr, member, idx) (descr->member[idx])/* Set member of the thread descriptor directly.  */# define THREAD_SETMEM(descr, member, value) \    descr->member = (value)/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */# define THREAD_SETMEM_NC(descr, member, idx, value) \    descr->member[idx] = (value)#define THREAD_GET_POINTER_GUARD() \  ({ tcbhead_t *__tcbp;							      \     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \     __tcbp->pointer_guard;}) #define THREAD_SET_POINTER_GUARD(value) \  ({ tcbhead_t *__tcbp;							      \     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \     __tcbp->pointer_guard = (value);})#define THREAD_COPY_POINTER_GUARD(descr) \  ({ tcbhead_t *__tcbp;							      \     __asm __volatile ("stc gbr,%0" : "=r" (__tcbp));			      \     ((tcbhead_t *) (descr + 1))->pointer_guard	= __tcbp->pointer_guard;})/* Get and set the global scope generation counter in struct pthread.  */#define THREAD_GSCOPE_FLAG_UNUSED 0#define THREAD_GSCOPE_FLAG_USED   1#define THREAD_GSCOPE_FLAG_WAIT   2#define THREAD_GSCOPE_RESET_FLAG() \  do									     \    { int __res								     \	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,	     \			       THREAD_GSCOPE_FLAG_UNUSED);		     \      if (__res == THREAD_GSCOPE_FLAG_WAIT)				     \	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \    }									     \  while (0)#define THREAD_GSCOPE_SET_FLAG() \  do									     \    {									     \      THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;	     \      atomic_write_barrier ();						     \    }									     \  while (0)#define THREAD_GSCOPE_WAIT() \  GL(dl_wait_lookup_done) ()#endif /* __ASSEMBLER__ */#endif	/* tls.h */