text: /* Machine-dependent pthreads configuration and inline functions.
     nios2 version.
     Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     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
  
  #include <features.h>
  
  #ifndef PT_EI
  # define PT_EI __extern_always_inline
  #endif
  
  /* Spinlock implementation; required.  */
  PT_EI long int
  testandset (int *spinlock)
  {
    unsigned int scratch;
    long int ret=-2;
  
    __asm__ __volatile__(
           "rdctl %0, status\n\t"
           "and	%0, %0, %1\n\t"
           "wrctl status, %0   #disable interrupts\n\t"
           "ldw %1, 0(%4)\n\t"
           "stw %3, 0(%4)\n\t"
           "ori	%0, %0, 1\n\t"
           "wrctl status, %0   #enable interrupts\n\t"
         : "=&r"(scratch), "=r"(ret)
         : "1"(ret), "r"(1), "r"(spinlock)
         : "memory");
  
    return ret;
  }
  
  
  /* 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__ ("%sp");
  
  #endif /* pt-machine.h */
  