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-rw-r--r--linuxthreads/sysdeps/i386/tls.h225
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diff --git a/linuxthreads/sysdeps/i386/tls.h b/linuxthreads/sysdeps/i386/tls.h
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--- a/linuxthreads/sysdeps/i386/tls.h
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-/* Definition for thread-local data handling. linuxthreads/i386 version.
- Copyright (C) 2002, 2003, 2004 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>
-# include <pt-machine.h>
-
-#ifndef __ASSEMBLER__
-# include <stddef.h>
-# include <stdint.h>
-
-/* Type for the dtv. */
-typedef union dtv
-{
- size_t counter;
- void *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;
-#ifdef NEED_DL_SYSINFO
- uintptr_t sysinfo;
-#endif
-} tcbhead_t;
-
-#else /* __ASSEMBLER__ */
-# include <tcb-offsets.h>
-#endif
-
-/* We can support TLS only if the floating-stack support is available.
- However, we want to compile in the support and test at runtime whether
- the running kernel can support it or not. To avoid bothering with the
- TLS support code at all, use configure --without-tls.
-
- We need USE_TLS to be consistently defined, for ldsodefs.h conditionals.
- But some of the code below can cause problems in building libpthread
- (e.g. useldt.h will defined FLOATING_STACKS when it shouldn't). */
-
-#if defined HAVE_TLS_SUPPORT \
- && (defined FLOATING_STACKS || !defined IS_IN_libpthread)
-
-/* 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)
-
-# 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 IS_IN_linuxthreads && !defined DO_MODIFY_LDT
-# include "useldt.h" /* For the structure. */
-# endif
-# if __ASSUME_LDT_WORKS > 0
-# define TLS_DO_MODIFY_LDT_KERNEL_CHECK(doit) (doit) /* Nothing to check. */
-# else
-# define TLS_DO_MODIFY_LDT_KERNEL_CHECK(doit) \
- (__builtin_expect (GLRO(dl_osversion) < 131939, 0) \
- ? "kernel too old for thread-local storage support\n" \
- : (doit))
-# endif
-
-# define TLS_DO_MODIFY_LDT(descr, nr) \
-TLS_DO_MODIFY_LDT_KERNEL_CHECK( \
-({ \
- struct modify_ldt_ldt_s ldt_entry = \
- { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \
- 1, 0, 0, 1, 0, 1, 0 }; \
- int result; \
- asm volatile (TLS_LOAD_EBX \
- "int $0x80\n\t" \
- TLS_LOAD_EBX \
- : "=a" (result) \
- : "0" (__NR_modify_ldt), \
- /* The extra argument with the "m" constraint is necessary \
- to let the compiler know that we are accessing LDT_ENTRY \
- here. */ \
- "m" (ldt_entry), TLS_EBX_ARG (1), "c" (&ldt_entry), \
- "d" (sizeof (ldt_entry))); \
- __builtin_expect (result, 0) == 0 \
- ? ({ asm ("movw %w0, %%gs" : : "q" ((nr) * 8 + 7)); NULL; }) \
- : "cannot set up LDT for thread-local storage\n"; \
-}))
-
-# define TLS_DO_SET_THREAD_AREA(descr, secondcall) \
-({ \
- 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; \
- if (secondcall) \
- ldt_entry.entry_number = ({ int _gs; \
- asm ("movw %%gs, %w0" : "=q" (_gs)); \
- (_gs & 0xffff) >> 3; }); \
- asm volatile (TLS_LOAD_EBX \
- "int $0x80\n\t" \
- TLS_LOAD_EBX \
- : "=a" (result), "=m" (ldt_entry.entry_number) \
- : "0" (__NR_set_thread_area), \
- /* The extra argument with the "m" constraint is necessary \
- to let the compiler know that we are accessing LDT_ENTRY \
- here. */ \
- TLS_EBX_ARG (&ldt_entry), "m" (ldt_entry)); \
- if (__builtin_expect (result, 0) == 0) \
- asm ("movw %w0, %%gs" : : "q" (ldt_entry.entry_number * 8 + 3)); \
- result; \
-})
-
-# ifdef __ASSUME_SET_THREAD_AREA_SYSCALL
-# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \
- (TLS_DO_SET_THREAD_AREA (descr, secondcall) \
- ? "set_thread_area failed when setting up thread-local storage\n" : NULL)
-# elif defined __NR_set_thread_area
-# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \
- (TLS_DO_SET_THREAD_AREA (descr, secondcall) \
- ? TLS_DO_MODIFY_LDT (descr, 0) : NULL)
-# else
-# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \
- TLS_DO_MODIFY_LDT ((descr), 0)
-# endif
-
-#if defined NEED_DL_SYSINFO
-# define INIT_SYSINFO \
- head->sysinfo = GLRO(dl_sysinfo)
-#else
-# define INIT_SYSINFO
-#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.
-
- The value of this macro is null if successful, or an error string. */
-# define TLS_INIT_TP(descr, secondcall) \
- ({ \
- void *_descr = (descr); \
- tcbhead_t *head = _descr; \
- \
- head->tcb = _descr; \
- /* For now the thread descriptor is at the same address. */ \
- head->self = _descr; \
- \
- INIT_SYSINFO; \
- TLS_SETUP_GS_SEGMENT (_descr, secondcall); \
- })
-
-/* 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 && (FLOATING_STACKS || !IS_IN_libpthread) */
-#endif /* __ASSEMBLER__ */
-
-#endif /* tls.h */