sysdeps/sparc/nptl/tls.h

   1 /* Definitions for thread-local data handling.  NPTL/sparc version.
   2    Copyright (C) 2003-2018 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _TLS_H
  20 #define _TLS_H
  21
  22 #include <dl-sysdep.h>
  23 #ifndef __ASSEMBLER__
  24 # include <stdbool.h>
  25 # include <stddef.h>
  26 # include <stdint.h>
  27 # include <stdlib.h>
  28 # include <list.h>
  29 # include <kernel-features.h>
  30 # include <dl-dtv.h>
  31
  32 typedef struct
  33 {
  34   void *tcb;            /* Pointer to the TCB.  Not necessary the
  35                            thread descriptor used by libpthread.  */
  36   dtv_t *dtv;
  37   void *self;
  38   int multiple_threads;
  39 #if __WORDSIZE == 64
  40   int gscope_flag;
  41 #endif
  42   uintptr_t sysinfo;
  43   uintptr_t stack_guard;
  44   uintptr_t pointer_guard;
  45 #if __WORDSIZE != 64
  46   int gscope_flag;
  47 #endif
  48 #ifndef __ASSUME_PRIVATE_FUTEX
  49   int private_futex;
  50 #endif
  51 } tcbhead_t;
  52
  53 #else /* __ASSEMBLER__ */
  54 # include <tcb-offsets.h>
  55 #endif /* __ASSEMBLER__ */
  56
  57
  58 #ifndef __ASSEMBLER__
  59 /* Get system call information.  */
  60 # include <sysdep.h>
  61
  62 register struct pthread *__thread_self __asm__("%g7");
  63
  64 /* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
  65    because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
  66    struct pthread even when not linked with -lpthread.  */
  67 # define TLS_INIT_TCB_SIZE sizeof (struct pthread)
  68
  69 /* Alignment requirements for the initial TCB.  */
  70 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
  71
  72 /* This is the size of the TCB.  */
  73 # define TLS_TCB_SIZE sizeof (struct pthread)
  74
  75 /* Alignment requirements for the TCB.  */
  76 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  77
  78 /* The TCB can have any size and the memory following the address the
  79    thread pointer points to is unspecified.  Allocate the TCB there.  */
  80 # define TLS_TCB_AT_TP  1
  81 # define TLS_DTV_AT_TP  0
  82
  83 /* Get the thread descriptor definition.  */
  84 # include <nptl/descr.h>
  85
  86 /* Install the dtv pointer.  The pointer passed is to the element with
  87    index -1 which contain the length.  */
  88 # define INSTALL_DTV(descr, dtvp) \
  89   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  90
  91 /* Install new dtv for current thread.  */
  92 # define INSTALL_NEW_DTV(DTV) \
  93   (((tcbhead_t *) __thread_self)->dtv = (DTV))
  94
  95 /* Return dtv of given thread descriptor.  */
  96 # define GET_DTV(descr) \
  97   (((tcbhead_t *) (descr))->dtv)
  98
  99 /* Code to initially initialize the thread pointer.  */
 100 # define TLS_INIT_TP(descr) \
 101   (__thread_self = (__typeof (__thread_self)) (descr), NULL)
 102
 103 /* Value passed to 'clone' for initialization of the thread register.  */
 104 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd)
 105
 106 /* Return the address of the dtv for the current thread.  */
 107 # define THREAD_DTV() \
 108   (((tcbhead_t *) __thread_self)->dtv)
 109
 110 /* Return the thread descriptor for the current thread.  */
 111 #define THREAD_SELF  __thread_self
 112
 113 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 114 # define DB_THREAD_SELF \
 115   REGISTER (32, 32, 10 * 4, 0) \
 116   REGISTER (64, __WORDSIZE, (6 * 8) + (__WORDSIZE==64?0:4), 0)
 117
 118 /* Access to data in the thread descriptor is easy.  */
 119 #define THREAD_GETMEM(descr, member) \
 120   descr->member
 121 #define THREAD_GETMEM_NC(descr, member, idx) \
 122   descr->member[idx]
 123 #define THREAD_SETMEM(descr, member, value) \
 124   descr->member = (value)
 125 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 126   descr->member[idx] = (value)
 127
 128 /* Set the stack guard field in TCB head.  */
 129 #define THREAD_SET_STACK_GUARD(value) \
 130   THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
 131 # define THREAD_COPY_STACK_GUARD(descr) \
 132   ((descr)->header.stack_guard \
 133    = THREAD_GETMEM (THREAD_SELF, header.stack_guard))
 134
 135 /* Get/set the stack guard field in TCB head.  */
 136 #define THREAD_GET_POINTER_GUARD() \
 137   THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
 138 #define THREAD_SET_POINTER_GUARD(value) \
 139   THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
 140 # define THREAD_COPY_POINTER_GUARD(descr) \
 141   ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
 142
 143 /* Get and set the global scope generation counter in struct pthread.  */
 144 #define THREAD_GSCOPE_FLAG_UNUSED 0
 145 #define THREAD_GSCOPE_FLAG_USED   1
 146 #define THREAD_GSCOPE_FLAG_WAIT   2
 147 #define THREAD_GSCOPE_RESET_FLAG() \
 148   do                                                                         \
 149     { int __res                                                              \
 150         = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,             \
 151                                THREAD_GSCOPE_FLAG_UNUSED);                   \
 152       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                  \
 153         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
 154     }                                                                        \
 155   while (0)
 156 #define THREAD_GSCOPE_SET_FLAG() \
 157   do                                                                         \
 158     {                                                                        \
 159       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;             \
 160       atomic_write_barrier ();                                               \
 161     }                                                                        \
 162   while (0)
 163 #define THREAD_GSCOPE_WAIT() \
 164   GL(dl_wait_lookup_done) ()
 165
 166 #endif /* !ASSEMBLER */
 167
 168 #endif  /* tls.h */