nptl/sysdeps/s390/tls.h

   1 /* Definition for thread-local data handling.  NPTL/s390 version.
   2    Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _TLS_H
  21 #define _TLS_H  1
  22
  23 #include <dl-sysdep.h>
  24 #ifndef __ASSEMBLER__
  25 # include <stddef.h>
  26 # include <stdint.h>
  27 # include <stdlib.h>
  28 # include <list.h>
  29
  30
  31 /* Type for the dtv.  */
  32 typedef union dtv
  33 {
  34   size_t counter;
  35   void *pointer;
  36 } dtv_t;
  37
  38
  39 typedef struct
  40 {
  41   void *tcb;            /* Pointer to the TCB.  Not necessary the
  42                            thread descriptor used by libpthread.  */
  43   dtv_t *dtv;
  44   void *self;           /* Pointer to the thread descriptor.  */
  45   int multiple_threads;
  46 # ifdef NEED_DL_SYSINFO
  47   uintptr_t sysinfo;
  48 # endif
  49 } tcbhead_t;
  50
  51 # ifndef __s390x__
  52 #  define TLS_MULTIPLE_THREADS_IN_TCB 1
  53 # endif
  54
  55 #else /* __ASSEMBLER__ */
  56 # include <tcb-offsets.h>
  57 #endif
  58
  59
  60 /* We require TLS support in the tools.  */
  61 #ifndef HAVE_TLS_SUPPORT
  62 # error "TLS support is required."
  63 #endif
  64
  65 /* Signal that TLS support is available.  */
  66 #define USE_TLS 1
  67
  68 /* Alignment requirement for the stack.  For IA-32 this is governed by
  69    the SSE memory functions.  */
  70 #define STACK_ALIGN     16
  71
  72 #ifndef __ASSEMBLER__
  73 /* Get system call information.  */
  74 # include <sysdep.h>
  75
  76 /* Get the thread descriptor definition.  */
  77 # include <nptl/descr.h>
  78
  79 /* This is the size of the initial TCB.  */
  80 # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
  81
  82 /* Alignment requirements for the initial TCB.  */
  83 # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
  84
  85 /* This is the size of the TCB.  */
  86 # define TLS_TCB_SIZE sizeof (struct pthread)
  87
  88 /* Alignment requirements for the TCB.  */
  89 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  90
  91 /* The TCB can have any size and the memory following the address the
  92    thread pointer points to is unspecified.  Allocate the TCB there.  */
  93 # define TLS_TCB_AT_TP  1
  94
  95
  96 /* Install the dtv pointer.  The pointer passed is to the element with
  97    index -1 which contain the length.  */
  98 #  define INSTALL_DTV(descr, dtvp) \
  99   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
 100
 101 /* Install new dtv for current thread.  */
 102 #  define INSTALL_NEW_DTV(dtv) \
 103   (((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv))
 104
 105 /* Return dtv of given thread descriptor.  */
 106 #  define GET_DTV(descr) \
 107   (((tcbhead_t *) (descr))->dtv)
 108
 109 #if defined NEED_DL_SYSINFO && defined SHARED
 110 # define INIT_SYSINFO \
 111   _head->sysinfo = GLRO(dl_sysinfo)
 112 #else
 113 # define INIT_SYSINFO
 114 #endif
 115
 116 /* Code to initially initialize the thread pointer.  This might need
 117    special attention since 'errno' is not yet available and if the
 118    operation can cause a failure 'errno' must not be touched.  */
 119 # define TLS_INIT_TP(thrdescr, secondcall) \
 120   ({ void *_thrdescr = (thrdescr);                                            \
 121      tcbhead_t *_head = _thrdescr;                                            \
 122                                                                               \
 123      _head->tcb = _thrdescr;                                                  \
 124      /* For now the thread descriptor is at the same address.  */             \
 125      _head->self = _thrdescr;                                                 \
 126      /* New syscall handling support.  */                                     \
 127      INIT_SYSINFO;                                                            \
 128                                                                               \
 129     __builtin_set_thread_pointer (_thrdescr);                                 \
 130     NULL;                                                                     \
 131   })
 132
 133 /* Return the address of the dtv for the current thread.  */
 134 #  define THREAD_DTV() \
 135   (((tcbhead_t *) __builtin_thread_pointer ())->dtv)
 136
 137 /* Return the thread descriptor for the current thread.  */
 138 # define THREAD_SELF ((struct pthread *) __builtin_thread_pointer ())
 139
 140 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 141 # define DB_THREAD_SELF REGISTER (32, 32, 18 * 4, 0) \
 142                         REGISTER (64, __WORDSIZE, 18 * 8, 0)
 143
 144 /* Access to data in the thread descriptor is easy.  */
 145 #define THREAD_GETMEM(descr, member) \
 146   descr->member
 147 #define THREAD_GETMEM_NC(descr, member, idx) \
 148   descr->member[idx]
 149 #define THREAD_SETMEM(descr, member, value) \
 150   descr->member = (value)
 151 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 152   descr->member[idx] = (value)
 153
 154 #endif /* __ASSEMBLER__ */
 155
 156 #endif  /* tls.h */