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Diffstat (limited to 'linuxthreads/sysdeps/i386/tls.h')
| -rw-r--r-- | linuxthreads/sysdeps/i386/tls.h | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/linuxthreads/sysdeps/i386/tls.h b/linuxthreads/sysdeps/i386/tls.h deleted file mode 100644 index f5d555baec..0000000000 --- a/linuxthreads/sysdeps/i386/tls.h +++ /dev/null @@ -1,237 +0,0 @@ -/* Definition for thread-local data handling. linuxthreads/i386 version. - Copyright (C) 2002, 2003, 2004, 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 - -# include <dl-sysdep.h> -# include <pt-machine.h> - -#ifndef __ASSEMBLER__ -# include <stdbool.h> -# include <stddef.h> -# include <stdint.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; -#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. */ -# ifndef IS_IN_rtld -# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct) -# else -# include <nptl-struct-pthread.h> -# define TLS_TCB_SIZE \ - (sizeof (struct _pthread_descr_struct) > NPTL_STRUCT_PTHREAD_SIZE \ - ? sizeof (struct _pthread_descr_struct) : NPTL_STRUCT_PTHREAD_SIZE) -# endif - -/* 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 */ |