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/*
* Copyright (C) 2016-2017 Andes Technology, Inc.
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Machine-dependent pthreads configuration and inline functions.
Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
Contributed by Philip Blundell <philb@gnu.org>.
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
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)
{
unsigned int val;
unsigned int temp;
unsigned int offset = 0;
__asm__ __volatile__ (
"1:\n\t"
"llw %[val], [%[spinlock] + %[offset] << 0]\n\t"
"move %[temp], #0x1\n\t"
"beq %[val], %[temp], 2f\n\t"
"scw %[temp], [%[spinlock] + %[offset] << 0]\n\t"
"beqz %[temp], 1b\n\t"
"2:\n\t"
: [val] "=&r" (val), [temp] "=&r" (temp)
: [spinlock] "r" (spinlock), [offset] "r" (offset)
: "memory" ) ;
return val ;
}
/* 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 */
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