/* Machine-dependent pthreads configuration and inline functions.
   sparc version.
   Copyright (C) 1996-1998, 2000-2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson <rth@tamu.edu>.

   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, see <http://www.gnu.org/licenses/>.  */

#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H   1

#ifndef PT_EI
# define PT_EI __extern_always_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__("ldstub %1,%0"
	: "=r"(ret), "=m"(*spinlock)
	: "m"(*spinlock));

  return ret;
}


/* Memory barrier; default is to do nothing */
#define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory")


/* 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 + (2 * 64))
register char *stack_pointer __asm__("%sp");


/* Registers %g6 and %g7 are reserved by the ABI for "system use".
   %g7 is specified in the TLS ABI as thread pointer -- we do the same.  */
struct _pthread_descr_struct;
register struct _pthread_descr_struct *__thread_self __asm__("%g7");

/* Return the thread descriptor for the current thread.  */
#define THREAD_SELF  __thread_self

/* Initialize the thread-unique value.  */
#define INIT_THREAD_SELF(descr, nr)  (__thread_self = (descr))

/* Access to data in the thread descriptor is easy.  */
#define THREAD_GETMEM(descr, member) \
  ((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_GETMEM_NC(descr, member) \
  ((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_SETMEM(descr, member, value) \
  ((void) sizeof (descr), THREAD_SELF->member = (value))
#define THREAD_SETMEM_NC(descr, member, value) \
  ((void) sizeof (descr), THREAD_SELF->member = (value))

/* 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     8*1024*1024

#endif /* pt-machine.h */
