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+/* Definitions for thread-local data handling. linuxthreads/x86-64 version.
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+ Copyright (C) 2002 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+#ifndef _TLS_H
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+#define _TLS_H
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+
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+#ifndef __ASSEMBLER__
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+
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+# include <pt-machine.h>
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+# include <stddef.h>
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+
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+/* Type for the dtv. */
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+typedef union dtv
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+{
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+ size_t counter;
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+ void *pointer;
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+} dtv_t;
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+
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+
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+typedef struct
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+{
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+ void *tcb; /* Pointer to the TCB. Not necessary the
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+ thread descriptor used by libpthread. */
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+ dtv_t *dtv;
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+ void *self; /* Pointer to the thread descriptor. */
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+ int multiple_threads;
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+} tcbhead_t;
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+
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+#else /* __ASSEMBLER__ */
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+# include <tcb-offsets.h>
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+#endif
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+
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+
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+#ifdef HAVE_TLS_SUPPORT
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+
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+/* Signal that TLS support is available. */
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+# define USE_TLS 1
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+
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+# ifndef __ASSEMBLER__
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+/* Get system call information. */
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+# include <sysdep.h>
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+
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+/* Get the thread descriptor definition. */
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+# include <linuxthreads/descr.h>
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+
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+/* This is the size of the initial TCB. */
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+# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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+
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+/* Alignment requirements for the initial TCB. */
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+# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
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+
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+/* This is the size of the TCB. */
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+# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct)
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+
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+/* Alignment requirements for the TCB. */
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+# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
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+
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+/* The TCB can have any size and the memory following the address the
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+ thread pointer points to is unspecified. Allocate the TCB there. */
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+# define TLS_TCB_AT_TP 1
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+
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+
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+/* Install the dtv pointer. The pointer passed is to the element with
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+ index -1 which contain the length. */
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+# define INSTALL_DTV(descr, dtvp) \
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+ ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
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+
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+/* Install new dtv for current thread. */
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+# define INSTALL_NEW_DTV(dtv) \
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+ ({ struct _pthread_descr_struct *__descr; \
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+ THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); })
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+
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+/* Return dtv of given thread descriptor. */
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+# define GET_DTV(descr) \
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+ (((tcbhead_t *) (descr))->dtv)
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+
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+/* Code to initially initialize the thread pointer. This might need
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+ special attention since 'errno' is not yet available and if the
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+ operation can cause a failure 'errno' must not be touched. */
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+# define TLS_INIT_TP(descr, secondcall) \
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+ ({ \
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+ void *_descr = (descr); \
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+ tcbhead_t *head = _descr; \
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+ long int _result; \
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+ \
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+ head->tcb = _descr; \
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+ /* For now the thread descriptor is at the same address. */ \
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+ head->self = _descr; \
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+ \
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+ asm volatile ("syscall" \
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+ : "=a" (_result) \
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+ : "0" ((unsigned long int) __NR_arch_prctl), \
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+ "D" ((unsigned long int) ARCH_SET_FS), \
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+ "S" (_descr) \
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+ : "memory", "cc", "r11", "cx"); \
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+ \
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+ _result ? "cannot set %fs base address for thread-local storage" : 0; \
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+ })
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+
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+/* Indicate that dynamic linker shouldn't try to initialize TLS even
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+ when no PT_TLS segments are found in the program and libraries
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+ it is linked against. */
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+# define TLS_INIT_TP_EXPENSIVE 1
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+
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+/* Return the address of the dtv for the current thread. */
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+# define THREAD_DTV() \
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+ ({ struct _pthread_descr_struct *__descr; \
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+ THREAD_GETMEM (__descr, p_header.data.dtvp); })
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+
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+# endif /* HAVE_TLS_SUPPORT */
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+#endif /* __ASSEMBLER__ */
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+
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+#endif /* tls.h */
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