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/*
* Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
*
* Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
*/
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H 1
#include <features.h>
#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);
PT_EI long int
testandset (int *spinlock)
{
unsigned int old = 1;
/* Atomically exchange @spinlock with 1 */
__asm__ __volatile__(
"ex %0, [%1]"
: "+r" (old)
: "r" (spinlock)
: "memory");
return old;
}
/* 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 \
__extension__ ({ char *__sp; __asm__ ("mov %0,sp" : "=r" (__sp)); __sp; })
#else
#error PT_MACHINE already defined
#endif /* pt-machine.h */
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