sysdeps/unix/bsd/bsd4.4/kfreebsd/x86_64/fbtl/tls.h

   1 /* Definitions for thread-local data handling.  fbtl/x86-64 version.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Modification for FreeBSD by Petr Salinger, 2006.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _FREEBSD_TLS_H
  22 #define _FREEBSD_TLS_H
  23
  24 #include <fbtl/sysdeps/x86_64/tls.h>
  25
  26 #ifndef __ASSEMBLER__
  27
  28 #include <sysarch.h>
  29 #include <sys/syscall.h>
  30
  31 #if 0
  32 /* in Linux one; */
  33 /* Magic for libthread_db to know how to do THREAD_SELF.  */
  34 # define DB_THREAD_SELF_INCLUDE  <sys/reg.h> /* For the FS constant.  */
  35 # define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)
  36 #else
  37 /* # warning proper FS constant needed */
  38 # undef DB_THREAD_SELF_INCLUDE
  39 # undef DB_THREAD_SELF
  40 # define DB_THREAD_SELF CONST_THREAD_AREA (64, 25)
  41 #endif
  42
  43 /* Code to initially initialize the thread pointer.  This might need
  44    special attention since 'errno' is not yet available and if the
  45    operation can cause a failure 'errno' must not be touched.  */
  46
  47 # undef TLS_INIT_TP
  48 # define TLS_INIT_TP(descr)                                                   \
  49   ({                                                                          \
  50     void *_descr = (descr);                                                   \
  51     tcbhead_t *head = _descr;                                                 \
  52     long int _result;                                                         \
  53                                                                               \
  54     head->tcb = _descr;                                                       \
  55     /* For now the thread descriptor is at the same address.  */              \
  56     head->self = _descr;                                                      \
  57                                                                               \
  58     asm volatile ("syscall"                                                   \
  59                   : "=a" (_result)                                            \
  60                   : "0" ((unsigned long int) SYS_sysarch),                    \
  61                     "D" ((unsigned long int) AMD64_SET_FSBASE),               \
  62                     "S" (&_descr)                                             \
  63                   : "memory", "cc", "cx", "dx", "r8", "r9", "r10", "r11");    \
  64                                                                               \
  65     _result ? "cannot set %fs base address for thread-local storage" : 0;     \
  66   })
  67
  68 /* in fact this is OS-specific, but we do not have better header for it */
  69 #define NEED_STACK_SIZE_FOR_PTH_CREATE 1
  70
  71 #endif /* __ASSEMBLER__ */
  72
  73 #endif  /* tls.h */