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phoenix |
/* Machine-dependent pthreads configuration and inline functions.
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CRIS version.
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Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _PT_MACHINE_H
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#define _PT_MACHINE_H 1
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#ifndef PT_EI
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# define PT_EI extern inline
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#endif
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extern long int testandset (int *spinlock);
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extern int __compare_and_swap (long int *p, long int oldval, long int newval);
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PT_EI long int
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testandset (int *spinlock)
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{
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register unsigned long int ret;
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/* Note the use of a dummy output of *spinlock to expose the write. The
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memory barrier is to stop *other* writes being moved past this code. */
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__asm__ __volatile__("clearf\n"
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"0:\n\t"
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"movu.b [%2],%0\n\t"
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"ax\n\t"
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"move.b %3,[%2]\n\t"
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"bwf 0b\n\t"
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"clearf"
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: "=&r" (ret), "=m" (*spinlock)
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: "r" (spinlock), "r" ((int) 1)
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: "memory");
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return ret;
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}
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame.
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I don't trust register variables, so let's do this the safe way. */
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#define CURRENT_STACK_FRAME \
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({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; })
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#endif /* pt-machine.h */
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