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/* Machine-dependent pthreads configuration and inline functions.
   SuperH version.
   Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Niibe Yutaka <gniibe@m17n.org>.
 
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.
 
   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */
 
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H   1
 
#ifndef __ASSEMBLER__
#ifndef PT_EI
# define PT_EI extern inline
#endif
 
extern long int testandset (int *spinlock);
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
 
/* Spinlock implementation; required.  */
PT_EI long int
testandset (int *spinlock)
{
  int ret;
 
  __asm__ __volatile__(
       "tas.b	@%1\n\t"
       "movt	%0"
       : "=r" (ret)
       : "r" (spinlock)
       : "memory", "cc");
 
  return (ret == 0);
}
 
/* We want the OS to assign stack addresses.  */
#define FLOATING_STACKS 1
 
/* Maximum size of the stack if the rlimit is unlimited.  */
#define ARCH_STACK_MAX_SIZE     32*1024*1024
 
/* Get some notion of the current stack.  Need not be exactly the top
   of the stack, just something somewhere in the current frame.  */
#define CURRENT_STACK_FRAME  stack_pointer
register char * stack_pointer __asm__ ("r15");
 
/* Return the thread descriptor for the current thread.  */
struct _pthread_descr_struct;
#define THREAD_SELF \
  ({ struct _pthread_descr_struct *self; \
      __asm__("stc gbr,%0" : "=r" (self)); self;})
 
/* Initialize the thread-unique value.  */
#define INIT_THREAD_SELF(descr, nr) \
  ({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));})
 
/* Access to data in the thread descriptor is easy.  */
#define THREAD_GETMEM(descr, member) THREAD_SELF->member
#define THREAD_GETMEM_NC(descr, member) THREAD_SELF->member
#define THREAD_SETMEM(descr, member, value) THREAD_SELF->member = (value)
#define THREAD_SETMEM_NC(descr, member, value) THREAD_SELF->member = (value)
#endif /* __ASSEMBLER__ */
 
#endif /* pt-machine.h */