sysdeps/microblaze/nptl/tls.h

   1 /* Copyright (C) 2005-2024 Free Software Foundation, Inc.
   2
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _TLS_H
  20 # define _TLS_H 1
  21
  22 # include <dl-sysdep.h>
  23
  24 #ifndef __ASSEMBLER__
  25 # include <stdbool.h>
  26 # include <stddef.h>
  27 # include <stdint.h>
  28 # include <dl-dtv.h>
  29 #endif /* __ASSEMBLER__ */
  30
  31 #ifndef __ASSEMBLER__
  32
  33 /* Get system call information.  */
  34 # include <sysdep.h>
  35
  36 /* The TP points to the start of the thread blocks.  */
  37 # define TLS_DTV_AT_TP  1
  38 # define TLS_TCB_AT_TP  0
  39
  40 /* Get the thread descriptor definition.  */
  41 # include <nptl/descr.h>
  42
  43 typedef struct
  44 {
  45   dtv_t *dtv;
  46   void *private;
  47 } tcbhead_t;
  48
  49 #define READ_THREAD_POINTER() \
  50   ({ register void *__microblaze_thread_area asm ("r21"); \
  51      __microblaze_thread_area; })
  52
  53 /* This is the size of the initial TCB.  */
  54 # define TLS_INIT_TCB_SIZE  sizeof (tcbhead_t)
  55
  56 /* This is the size of the TCB.  */
  57 # define TLS_TCB_SIZE       sizeof (tcbhead_t)
  58
  59 /* This is the size we need before TCB.  */
  60 # define TLS_PRE_TCB_SIZE   sizeof (struct pthread)
  61
  62 /* Install the dtv pointer.  The pointer passed is to the element with
  63    index -1 which contain the length.  */
  64 # define INSTALL_DTV(tcbp, dtvp) \
  65   (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
  66
  67 /* Install new dtv for current thread.  */
  68 # define INSTALL_NEW_DTV(dtv) \
  69   (THREAD_DTV() = (dtv))
  70
  71 /* Return dtv of given thread descriptor.  */
  72 # define GET_DTV(tcbp) \
  73   (((tcbhead_t *) (tcbp))->dtv)
  74
  75 /* Code to initially initialize the thread pointer.
  76    r21 is reserved for thread pointer.  */
  77 # define TLS_INIT_TP(tcbp) \
  78   ({ __asm __volatile ("or r21,r0,%0" : : "r" ((void *)tcbp)); true; })
  79
  80 # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1
  81
  82 /* Return the address of the dtv for the current thread.  */
  83 # define THREAD_DTV() \
  84   (((tcbhead_t *) READ_THREAD_POINTER())->dtv)
  85
  86 /* Return the thread descriptor for the current thread.  */
  87 # define THREAD_SELF \
  88   (((struct pthread *) READ_THREAD_POINTER()) - 1)
  89
  90 /* Magic for libthread_db to know how to do THREAD_SELF.  */
  91 # define DB_THREAD_SELF \
  92   CONST_THREAD_AREA (32, sizeof (struct pthread))
  93
  94 # include <tcb-access.h>
  95
  96 /* Get and set the global scope generation counter in struct pthread.  */
  97 # define THREAD_GSCOPE_FLAG_UNUSED 0
  98 # define THREAD_GSCOPE_FLAG_USED   1
  99 # define THREAD_GSCOPE_FLAG_WAIT   2
 100 # define THREAD_GSCOPE_RESET_FLAG()                                         \
 101   do                                                                        \
 102     { int __res                                                             \
 103       = atomic_exchange_release (&THREAD_SELF->header.gscope_flag,          \
 104                              THREAD_GSCOPE_FLAG_UNUSED);                    \
 105       if (__res == THREAD_GSCOPE_FLAG_WAIT)                                 \
 106         lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);  \
 107     }                                                                       \
 108   while (0)
 109 # define THREAD_GSCOPE_SET_FLAG()                                           \
 110   do                                                                        \
 111     {                                                                       \
 112       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;            \
 113       atomic_write_barrier ();                                              \
 114     }                                                                       \
 115   while (0)
 116
 117 #endif /* __ASSEMBLER__ */
 118
 119 #endif /* tls.h.  */