/* Definition for thread-local data handling.  nptl/i386 version.   Copyright (C) 2002, 2003, 2004, 2005, 2006 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#include <dl-sysdep.h>#ifndef __ASSEMBLER__# include <stdbool.h># include <stddef.h># include <stdint.h># include <stdlib.h># include <list.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;} tcbhead_t;# define TLS_MULTIPLE_THREADS_IN_TCB 1#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.  For IA-32 this is governed by   the SSE memory functions.  */#define STACK_ALIGN	16#ifndef __ASSEMBLER__/* Get system call information.  */# include <sysdep.h>/* The old way: using LDT.  *//* Structure passed to `modify_ldt', 'set_thread_area', and 'clone' calls.  */struct user_desc{  unsigned int entry_number;  unsigned long int base_addr;  unsigned int limit;  unsigned int seg_32bit:1;  unsigned int contents:2;  unsigned int read_exec_only:1;  unsigned int limit_in_pages:1;  unsigned int seg_not_present:1;  unsigned int useable:1;  unsigned int empty:25;};/* Initializing bit fields is slow.  We speed it up by using a union.  */union user_desc_init{  struct user_desc desc;  unsigned int vals[4];};/* Get the thread descriptor definition.  */# include <nptl/descr.h>/* 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)#define THREAD_SELF_SYSINFO	THREAD_GETMEM (THREAD_SELF, header.sysinfo)#define THREAD_SYSINFO(pd)	((pd)->header.sysinfo)/* Macros to load from and store into segment registers.  */# ifndef TLS_GET_GS#  define TLS_GET_GS() \  ({ int __seg; __asm ("movw %%gs, %w0" : "=q" (__seg)); __seg & 0xffff; })# endif# ifndef TLS_SET_GS#  define TLS_SET_GS(val) \  __asm ("movw %w0, %%gs" :: "q" (val))# endif# ifndef __NR_set_thread_area#  define __NR_set_thread_area 243# endif# ifndef TLS_FLAG_WRITABLE#  define TLS_FLAG_WRITABLE		0x00000001# endif// XXX Enable for the real world.#if 0# ifndef __ASSUME_SET_THREAD_AREA#  error "we need set_thread_area"# endif#endif# ifdef __PIC__#  define TLS_EBX_ARG "r"#  define TLS_LOAD_EBX "xchgl %3, %%ebx\n\t"# else#  define TLS_EBX_ARG "b"#  define TLS_LOAD_EBX# endif#if defined NEED_DL_SYSINFO# define INIT_SYSINFO \  _head->sysinfo = GLRO(dl_sysinfo)#else# define INIT_SYSINFO#endif#ifndef LOCK_PREFIX# ifdef UP#  define LOCK_PREFIX  /* nothing */# else#  define LOCK_PREFIX "lock;"# endif#endif/* 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(thrdescr, secondcall) \  ({ void *_thrdescr = (thrdescr);					      \     tcbhead_t *_head = _thrdescr;					      \     union user_desc_init _segdescr;					      \     int _result;							      \									      \     _head->tcb = _thrdescr;						      \     /* For now the thread descriptor is at the same address.  */	      \     _head->self = _thrdescr;						      \     /* New syscall handling support.  */				      \     INIT_SYSINFO;							      \									      \     /* The 'entry_number' field.  Let the kernel pick a value.  */	      \     if (secondcall)							      \       _segdescr.vals[0] = TLS_GET_GS () >> 3;				      \     else								      \       _segdescr.vals[0] = -1;						      \     /* The 'base_addr' field.  Pointer to the TCB.  */			      \     _segdescr.vals[1] = (unsigned long int) _thrdescr;			      \     /* The 'limit' field.  We use 4GB which is 0xfffff pages.  */	      \     _segdescr.vals[2] = 0xfffff;					      \     /* Collapsed value of the bitfield:				      \	  .seg_32bit = 1						      \	  .contents = 0							      \	  .read_exec_only = 0						      \	  .limit_in_pages = 1						      \	  .seg_not_present = 0						      \	  .useable = 1 */						      \     _segdescr.vals[3] = 0x51;						      \									      \     /* Install the TLS.  */						      \     asm volatile (TLS_LOAD_EBX						      \		   "int $0x80\n\t"					      \		   TLS_LOAD_EBX						      \		   : "=a" (_result), "=m" (_segdescr.desc.entry_number)	      \		   : "0" (__NR_set_thread_area),			      \		     TLS_EBX_ARG (&_segdescr.desc), "m" (_segdescr.desc));    \									      \     if (_result == 0)							      \       /* We know the index in the GDT, now load the segment register.	      \	  The use of the GDT is described by the value 3 in the lower	      \	  three bits of the segment descriptor value.			      \									      \	  Note that we have to do this even if the numeric value of	      \	  the descriptor does not change.  Loading the segment register	      \	  causes the segment information from the GDT to be loaded	      \	  which is necessary since we have changed it.   */		      \       TLS_SET_GS (_segdescr.desc.entry_number * 8 + 3);		      \									      \     _result == 0 ? NULL						      \     : "set_thread_area failed when setting up thread-local storage\n"; })/* 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 ("movl %%gs:%c1,%0" : "=r" (__self)				      \	  : "i" (offsetof (struct pthread, header.self)));		      \     __self;})/* Magic for libthread_db to know how to do THREAD_SELF.  */# define DB_THREAD_SELF \  REGISTER_THREAD_AREA (32, offsetof (struct user_regs_struct, xgs), 3) \  REGISTER_THREAD_AREA (64, 26 * 8, 3) /* x86-64's user_regs_struct->gs *//* Read member of the thread descriptor directly.  */# define THREAD_GETMEM(descr, member) \  ({ __typeof (descr->member) __value;					      \     if (sizeof (__value) == 1)						      \       asm volatile ("movb %%gs:%P2,%b0"				      \		     : "=q" (__value)					      \		     : "0" (0), "i" (offsetof (struct pthread, member)));     \     else if (sizeof (__value) == 4)					      \       asm volatile ("movl %%gs:%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 ("movl %%gs:%P1,%%eax\n\t"			      \		       "movl %%gs:%P2,%%edx"				      \		       : "=A" (__value)					      \		       : "i" (offsetof (struct pthread, member)),	      \			 "i" (offsetof (struct pthread, member) + 4));	      \       }								      \     __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 %%gs:%P2(%3),%b0"				      \		     : "=q" (__value)					      \		     : "0" (0), "i" (offsetof (struct pthread, member[0])),   \		     "r" (idx));					      \     else if (sizeof (__value) == 4)					      \       asm volatile ("movl %%gs:%P1(,%2,4),%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  ("movl %%gs:%P1(,%2,8),%%eax\n\t"		      \			"movl %%gs:4+%P1(,%2,8),%%edx"			      \			: "=&A" (__value)				      \			: "i" (offsetof (struct pthread, member[0])),	      \			  "r" (idx));					      \       }								      \     __value; })/* 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,%%gs:%P1" :				      \		     : "iq" (value),					      \		       "i" (offsetof (struct pthread, member)));	      \     else if (sizeof (descr->member) == 4)				      \       asm volatile ("movl %0,%%gs:%P1" :				      \		     : "ir" (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 ("movl %%eax,%%gs:%P1\n\t"			      \		       "movl %%edx,%%gs:%P2" :				      \		       : "A" (value),					      \			 "i" (offsetof (struct pthread, member)),	      \			 "i" (offsetof (struct pthread, member) + 4));	      \       }})/* 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,%%gs:%P1(%2)" :				      \		     : "iq" (value),					      \		       "i" (offsetof (struct pthread, member)),		      \		       "r" (idx));					      \     else if (sizeof (descr->member[0]) == 4)				      \       asm volatile ("movl %0,%%gs:%P1(,%2,4)" :			      \		     : "ir" (value),					      \		       "i" (offsetof (struct pthread, member)),		      \		       "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 ("movl %%eax,%%gs:%P1(,%2,8)\n\t"			      \		       "movl %%edx,%%gs:4+%P1(,%2,8)" :			      \		       : "A" (value),					      \			 "i" (offsetof (struct pthread, member)),	      \			 "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, %%gs:%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, %%gs:%P0"		      \			    :: "i" (offsetof (struct pthread, member)),	      \			       "ir" (1 << (bit)));			      \	    else							      \	      /* Not necessary for other sizes in the moment.  */	      \	      abort (); })/* Call the user-provided thread function.  */#define CALL_THREAD_FCT(descr) \  ({ void *__res;							      \     int __ignore1, __ignore2;						      \     asm volatile ("pushl %%eax\n\t"					      \		   "pushl %%eax\n\t"					      \		   "pushl %%eax\n\t"					      \		   "pushl %%gs:%P4\n\t"					      \		   "call *%%gs:%P3\n\t"					      \		   "addl $16, %%esp"					      \		   : "=a" (__res), "=c" (__ignore1), "=d" (__ignore2)	      \		   : "i" (offsetof (struct pthread, start_routine)),	      \		     "i" (offsetof (struct pthread, arg)));		      \     __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 */