linuxthreads/sysdeps/sh/pt-machine.h

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    SuperH version.
   3    Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Niibe Yutaka <gniibe@m17n.org>.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef PT_EI
  23 # define PT_EI extern inline
  24 #endif
  25
  26 /* Spinlock implementation; required.  */
  27 PT_EI long int
  28 testandset (int *spinlock)
  29 {
  30   int ret;
  31
  32   __asm__ __volatile__(
  33        "tas.b   @%1\n\t"
  34        "movt    %0"
  35        : "=r" (ret)
  36        : "r" (spinlock)
  37        : "memory", "cc");
  38
  39   return (ret == 0);
  40 }
  41
  42
  43 /* Get some notion of the current stack.  Need not be exactly the top
  44    of the stack, just something somewhere in the current frame.  */
  45 #define CURRENT_STACK_FRAME  stack_pointer
  46 register char * stack_pointer __asm__ ("r15");
  47
  48 /* Return the thread descriptor for the current thread.  */
  49 struct _pthread_descr_struct;
  50 #define THREAD_SELF \
  51   ({ struct _pthread_descr_struct *self; \
  52       __asm__("stc gbr,%0" : "=r" (self)); self;})
  53
  54 /* Initialize the thread-unique value.  */
  55 #define INIT_THREAD_SELF(descr, nr) \
  56   ({ __asm__("ldc %0,gbr" : : "r" (descr));})