linuxthreads/sysdeps/sh/pt-machine.h

   1 /* Machine-dependent pthreads configuration and inline functions.
   2    SuperH version.
   3    Copyright (C) 1999, 2000, 2001, 2002, 2003 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 Lesser General Public License as
   9    published by the Free Software Foundation; either version 2.1 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    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser 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_MACHINE_H
  23 #define _PT_MACHINE_H   1
  24
  25 #ifndef __ASSEMBLER__
  26 #ifndef PT_EI
  27 # define PT_EI extern inline __attribute__ ((always_inline))
  28 #endif
  29
  30 extern long int testandset (int *spinlock);
  31 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  32
  33 /* Spinlock implementation; required.  */
  34 PT_EI long int
  35 testandset (int *spinlock)
  36 {
  37   int ret;
  38
  39   __asm__ __volatile__(
  40        "tas.b   @%1\n\t"
  41        "movt    %0"
  42        : "=r" (ret)
  43        : "r" (spinlock)
  44        : "memory", "cc");
  45
  46   return (ret == 0);
  47 }
  48
  49 /* We want the OS to assign stack addresses.  */
  50 #define FLOATING_STACKS 1
  51
  52 /* Maximum size of the stack if the rlimit is unlimited.  */
  53 #define ARCH_STACK_MAX_SIZE     32*1024*1024
  54
  55 /* Get some notion of the current stack.  Need not be exactly the top
  56    of the stack, just something somewhere in the current frame.  */
  57 #define CURRENT_STACK_FRAME  stack_pointer
  58 register char * stack_pointer __asm__ ("r15");
  59
  60 /* Return the thread descriptor for the current thread.  */
  61 struct _pthread_descr_struct;
  62 #define THREAD_SELF \
  63   ({ struct _pthread_descr_struct *self; \
  64       __asm__("stc gbr,%0" : "=r" (self)); self;})
  65
  66 /* Initialize the thread-unique value.  */
  67 #define INIT_THREAD_SELF(descr, nr) \
  68   ({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));})
  69
  70 /* Access to data in the thread descriptor is easy.  */
  71 #define THREAD_GETMEM(descr, member) \
  72   ((void) sizeof (descr), THREAD_SELF->member)
  73 #define THREAD_GETMEM_NC(descr, member) \
  74   ((void) sizeof (descr), THREAD_SELF->member)
  75 #define THREAD_SETMEM(descr, member, value) \
  76   ((void) sizeof (descr), THREAD_SELF->member = (value))
  77 #define THREAD_SETMEM_NC(descr, member, value) \
  78   ((void) sizeof (descr), THREAD_SELF->member = (value))
  79 #endif /* __ASSEMBLER__ */
  80
  81 #endif /* pt-machine.h */