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/* Machine-dependent pthreads configuration and inline functions.
CRIS version.
Copyright (C) 2001, 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library 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 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);
PT_EI long int
testandset (int *spinlock)
{
register unsigned long int ret;
/* Note the use of a dummy output of *spinlock to expose the write. The
memory barrier is to stop *other* writes being moved past this code. */
__asm__ __volatile__("clearf\n"
"0:\n\t"
"movu.b [%2],%0\n\t"
"ax\n\t"
"move.b %3,[%2]\n\t"
"bwf 0b\n\t"
"clearf"
: "=&r" (ret), "=m" (*spinlock)
: "r" (spinlock), "r" ((int) 1)
: "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.
I don't trust register variables, so let's do this the safe way. */
#define CURRENT_STACK_FRAME \
({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; })
#endif /* pt-machine.h */
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