nptl/sysdeps/sparc/tls.h

   1 /* Definitions for thread-local data handling.  NPTL/sparc version.
   2    Copyright (C) 2003, 2005, 2006 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
  22
  23 #include <dl-sysdep.h>
  24 #ifndef __ASSEMBLER__
  25 # include <stdbool.h>
  26 # include <stddef.h>
  27 # include <stdint.h>
  28 # include <stdlib.h>
  29 # include <list.h>
  30
  31 /* Type for the dtv.  */
  32 typedef union dtv
  33 {
  34   size_t counter;
  35   struct
  36   {
  37     void *val;
  38     bool is_static;
  39   } pointer;
  40 } dtv_t;
  41
  42 typedef struct
  43 {
  44   void *tcb;            /* Pointer to the TCB.  Not necessary the
  45                            thread descriptor used by libpthread.  */
  46   dtv_t *dtv;
  47   void *self;
  48   int multiple_threads;
  49   uintptr_t sysinfo;
  50   uintptr_t stack_guard;
  51   uintptr_t pointer_guard;
  52 } tcbhead_t;
  53
  54 #else /* __ASSEMBLER__ */
  55 # include <tcb-offsets.h>
  56 #endif /* __ASSEMBLER__ */
  57
  58 /* We require TLS support in the tools.  */
  59 #ifndef HAVE_TLS_SUPPORT
  60 # error "TLS support is required."
  61 #endif
  62
  63 /* Signal that TLS support is available.  */
  64 #define USE_TLS 1
  65
  66 #ifndef __ASSEMBLER__
  67 /* Get system call information.  */
  68 # include <sysdep.h>
  69
  70 /* Get the thread descriptor definition.  */
  71 # include <nptl/descr.h>
  72
  73 register struct pthread *__thread_self __asm__("%g7");
  74
  75 /* This is the size of the initial TCB.  Can't be just sizeof (tcbhead_t),
  76    because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
  77    struct pthread even when not linked with -lpthread.  */
  78 # define TLS_INIT_TCB_SIZE sizeof (struct pthread)
  79
  80 /* Alignment requirements for the initial TCB.  */
  81 # define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
  82
  83 /* This is the size of the TCB.  */
  84 # define TLS_TCB_SIZE sizeof (struct pthread)
  85
  86 /* Alignment requirements for the TCB.  */
  87 # define TLS_TCB_ALIGN __alignof__ (struct pthread)
  88
  89 /* The TCB can have any size and the memory following the address the
  90    thread pointer points to is unspecified.  Allocate the TCB there.  */
  91 # define TLS_TCB_AT_TP  1
  92
  93 /* Install the dtv pointer.  The pointer passed is to the element with
  94    index -1 which contain the length.  */
  95 # define INSTALL_DTV(descr, dtvp) \
  96   ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
  97
  98 /* Install new dtv for current thread.  */
  99 # define INSTALL_NEW_DTV(DTV) \
 100   (((tcbhead_t *) __thread_self)->dtv = (DTV))
 101
 102 /* Return dtv of given thread descriptor.  */
 103 # define GET_DTV(descr) \
 104   (((tcbhead_t *) (descr))->dtv)
 105
 106 /* Code to initially initialize the thread pointer.  */
 107 # define TLS_INIT_TP(descr, secondcall) \
 108   (__thread_self = (__typeof (__thread_self)) (descr), NULL)
 109
 110 /* Return the address of the dtv for the current thread.  */
 111 # define THREAD_DTV() \
 112   (((tcbhead_t *) __thread_self)->dtv)
 113
 114 /* Return the thread descriptor for the current thread.  */
 115 #define THREAD_SELF  __thread_self
 116
 117 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 118 # define DB_THREAD_SELF_INCLUDE <sys/ucontext.h>
 119 # define DB_THREAD_SELF \
 120   REGISTER (32, 32, REG_G7 * 4, 0) REGISTER (64, 64, REG_G7 * 8, 0)
 121
 122 /* Access to data in the thread descriptor is easy.  */
 123 #define THREAD_GETMEM(descr, member) \
 124   descr->member
 125 #define THREAD_GETMEM_NC(descr, member, idx) \
 126   descr->member[idx]
 127 #define THREAD_SETMEM(descr, member, value) \
 128   descr->member = (value)
 129 #define THREAD_SETMEM_NC(descr, member, idx, value) \
 130   descr->member[idx] = (value)
 131
 132 /* Set the stack guard field in TCB head.  */
 133 #define THREAD_SET_STACK_GUARD(value) \
 134   THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
 135 # define THREAD_COPY_STACK_GUARD(descr) \
 136   ((descr)->header.stack_guard \
 137    = THREAD_GETMEM (THREAD_SELF, header.stack_guard))
 138
 139 /* Get/set the stack guard field in TCB head.  */
 140 #define THREAD_GET_POINTER_GUARD() \
 141   THREAD_GETMEM (THREAD_SELF, header.pointer_guard)
 142 #define THREAD_SET_POINTER_GUARD(value) \
 143   THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
 144 # define THREAD_COPY_POINTER_GUARD(descr) \
 145   ((descr)->header.pointer_guard = THREAD_GET_POINTER_GUARD ())
 146
 147 #endif /* !ASSEMBLER */
 148
 149 #endif  /* tls.h */