/* Special definitions for ix86 machine using segment register based   thread descriptor.   Copyright (C) 1998, 2000, 2001, 2002 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Ulrich Drepper <drepper@cygnus.com>.   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; see the file COPYING.LIB.  If not,   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,   Boston, MA 02111-1307, USA.	*/#ifndef __ASSEMBLER__#include <stddef.h>	/* For offsetof.  */#include <stdlib.h>	/* For abort().	 *//* We don't want to include the kernel header.	So duplicate the   information.	 *//* Structure passed on `modify_ldt' call.  */struct modify_ldt_ldt_s{  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;};/* System call to set LDT entry.  */extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);/* 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 \({									      \  register pthread_descr __self;					      \  __asm__ ("movl %%gs:%c1,%0" : "=r" (__self)				      \	   : "i" (offsetof (struct _pthread_descr_struct,		      \			    p_header.data.self)));			      \  __self;								      \})/* Initialize the thread-unique value.	Two possible ways to do it.  */#define DO_MODIFY_LDT(descr, nr)					      \({									      \  struct modify_ldt_ldt_s ldt_entry =					      \    { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */,	      \      1, 0, 0, 1, 0, 1, 0 };						      \  if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0)		      \    abort ();								      \  asm ("movw %w0, %%gs" : : "q" (nr * 8 + 7));				      \})#ifdef __PIC__# define USETLS_EBX_ARG "r"# define USETLS_LOAD_EBX "xchgl %3, %%ebx\n\t"#else# define USETLS_EBX_ARG "b"# define USETLS_LOAD_EBX#endif/* When using the new set_thread_area call, we don't need to change %gs   because we inherited the value set up in the main thread by TLS setup.   We need to extract that value and set up the same segment in this   thread.  */#if USE_TLS# define DO_SET_THREAD_AREA_REUSE(nr)	1#else/* Without TLS, we do the initialization of the main thread, where NR == 0.  */# define DO_SET_THREAD_AREA_REUSE(nr)	(!__builtin_constant_p (nr) || (nr))#endif#define DO_SET_THREAD_AREA(descr, nr) \({									      \  int __gs;								      \  if (DO_SET_THREAD_AREA_REUSE (nr))					      \    {									      \      asm ("movw %%gs, %w0" : "=q" (__gs));				      \      struct modify_ldt_ldt_s ldt_entry =				      \	{ (__gs & 0xffff) >> 3,						      \	  (unsigned long int) (descr), 0xfffff /* 4GB in pages */,	      \	  1, 0, 0, 1, 0, 1, 0 };					      \									      \      int __result;							      \      __asm (USETLS_LOAD_EBX						      \	     "movl %2, %%eax\n\t"					      \	     "int $0x80\n\t"						      \	     USETLS_LOAD_EBX						      \	     : "&a" (__result)						      \	     : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area));      \      if (__result == 0)						      \	asm ("movw %w0, %%gs" :: "q" (__gs));				      \      else								      \	__gs = -1;							      \    }									      \  else									      \    {									      \      struct modify_ldt_ldt_s ldt_entry =				      \	{ -1,								      \	  (unsigned long int) (descr), 0xfffff /* 4GB in pages */,	      \	  1, 0, 0, 1, 0, 1, 0 };					      \      int __result;							      \      __asm (USETLS_LOAD_EBX						      \	     "movl %2, %%eax\n\t"					      \	     "int $0x80\n\t"						      \	     USETLS_LOAD_EBX						      \	     : "&a" (__result)						      \	     : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area));      \      if (__result == 0)						      \	{								      \	  __gs = (ldt_entry.entry_number << 3) + 3;			      \	  asm ("movw %w0, %%gs" : : "q" (__gs));			      \	}								      \      else								      \	__gs = -1;							      \    }									      \  __gs;									      \})#if defined __ASSUME_SET_THREAD_AREA_SYSCALL# define INIT_THREAD_SELF(descr, nr)	DO_SET_THREAD_AREA (descr, nr)#elif defined __NR_set_thread_area# define INIT_THREAD_SELF(descr, nr)					      \({									      \  if (__builtin_expect (__have_no_set_thread_area, 0)			      \      || (DO_SET_THREAD_AREA (descr, DO_SET_THREAD_AREA_REUSE (nr)) == -1     \	  && (__have_no_set_thread_area = 1)))				      \    DO_MODIFY_LDT (descr, nr);						      \})/* Defined in pspinlock.c.  */extern int __have_no_set_thread_area;#else# define INIT_THREAD_SELF(descr, nr)	DO_MODIFY_LDT (descr, nr)#endif/* Free resources associated with thread descriptor.  */#ifdef __ASSUME_SET_THREAD_AREA_SYSCALL#define FREE_THREAD(descr, nr) do { } while (0)#elif defined __NR_set_thread_area#define FREE_THREAD(descr, nr) \{									      \  int __gs;								      \  __asm__ __volatile__ ("movw %%gs, %w0" : "=q" (__gs));		      \  if (__builtin_expect (__gs & 4, 0))					      \    {									      \      struct modify_ldt_ldt_s ldt_entry =				      \	{ nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 };				      \      __modify_ldt (1, &ldt_entry, sizeof (ldt_entry));			      \    }									      \}#else#define FREE_THREAD(descr, nr) \{									      \  struct modify_ldt_ldt_s ldt_entry =					      \    { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 };					      \  __modify_ldt (1, &ldt_entry, sizeof (ldt_entry));			      \}#endif/* 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_descr_struct,      \					   member)));			      \  else if (sizeof (__value) == 4)					      \    __asm__ __volatile__ ("movl %%gs:%P1,%0"				      \			  : "=r" (__value)				      \			  : "i" (offsetof (struct _pthread_descr_struct,      \					   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_descr_struct,    \					     member)),			      \			      "i" (offsetof (struct _pthread_descr_struct,    \					     member) + 4));		      \    }									      \  __value;								      \})/* Same as THREAD_GETMEM, but the member offset can be non-constant.  */#define THREAD_GETMEM_NC(descr, member) \({									      \  __typeof__ (descr->member) __value;					      \  if (sizeof (__value) == 1)						      \    __asm__ __volatile__ ("movb %%gs:(%2),%b0"				      \			  : "=q" (__value)				      \			  : "0" (0),					      \			    "r" (offsetof (struct _pthread_descr_struct,      \					   member)));			      \  else if (sizeof (__value) == 4)					      \    __asm__ __volatile__ ("movl %%gs:(%1),%0"				      \			  : "=r" (__value)				      \			  : "r" (offsetof (struct _pthread_descr_struct,      \					   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:(%1),%%eax\n\t"			      \			    "movl %%gs:4(%1),%%edx"			      \			    : "=&A" (__value)				      \			    : "r" (offsetof (struct _pthread_descr_struct,    \					     member)));			      \    }									      \  __value;								      \})/* Same as THREAD_SETMEM, but the member offset can be non-constant.  */#define THREAD_SETMEM(descr, member, value) \({									      \  __typeof__ (descr->member) __value = (value);				      \  if (sizeof (__value) == 1)						      \    __asm__ __volatile__ ("movb %0,%%gs:%P1" :				      \			  : "q" (__value),				      \			    "i" (offsetof (struct _pthread_descr_struct,      \					   member)));			      \  else if (sizeof (__value) == 4)					      \    __asm__ __volatile__ ("movl %0,%%gs:%P1" :				      \			  : "r" (__value),				      \			    "i" (offsetof (struct _pthread_descr_struct,      \					   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 %%eax,%%gs:%P1\n\n"			      \			    "movl %%edx,%%gs:%P2" :			      \			    : "A" (__value),				      \			      "i" (offsetof (struct _pthread_descr_struct,    \					     member)),			      \			      "i" (offsetof (struct _pthread_descr_struct,    \					     member) + 4));		      \    }									      \})/* Set member of the thread descriptor directly.  */#define THREAD_SETMEM_NC(descr, member, value) \({									      \  __typeof__ (descr->member) __value = (value);				      \  if (sizeof (__value) == 1)						      \    __asm__ __volatile__ ("movb %0,%%gs:(%1)" :				      \			  : "q" (__value),				      \			    "r" (offsetof (struct _pthread_descr_struct,      \					   member)));			      \  else if (sizeof (__value) == 4)					      \    __asm__ __volatile__ ("movl %0,%%gs:(%1)" :				      \			  : "r" (__value),				      \			    "r" (offsetof (struct _pthread_descr_struct,      \					   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 %%eax,%%gs:(%1)\n\t"			      \			    "movl %%edx,%%gs:4(%1)" :			      \			    : "A" (__value),				      \			      "r" (offsetof (struct _pthread_descr_struct,    \					     member)));			      \    }									      \})#endif/* We want the OS to assign stack addresses.  */#define FLOATING_STACKS	1/* Maximum size of the stack if the rlimit is unlimited.  */#define ARCH_STACK_MAX_SIZE	8*1024*1024