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/*
* sysdeps/microblaze/pt-machine.h -- microblaze-specific pthread definitions
*
* Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
* Copyright (C) 2002 NEC Electronics Corporation
* Copyright (C) 2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
*/
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H 1
#include <features.h>
#ifndef PT_EI
# define PT_EI __extern_always_inline
#endif
/* 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__ ("r1");
#define HAS_COMPARE_AND_SWAP
#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
#define MEMORY_BARRIER() __asm__ __volatile__("": : :"memory")
/* Atomically: If *PTR == OLD, set *PTR to NEW and return true,
otherwise do nothing and return false. */
PT_EI int __compare_and_swap (long *ptr, long old, long new)
{
long prev, cmp, retval;
__asm__ __volatile__ (" addi %2, r0, 0;"
"1: lwx %0, %3, r0;"
" cmp %1, %0, %4;"
" bnei %1, 2f;"
" swx %5, %3, r0;"
" addic %1, r0, 0;"
" bnei %1, 1b;"
" addi %2, r0, 1;"
"2:"
: "=&r" (prev), "=&r" (cmp), "=&r" (retval)
: "r" (ptr), "r" (old), "r" (new)
: "cc", "memory");
return retval;
}
PT_EI int
__compare_and_swap_with_release_semantics (long *p,
long oldval, long newval)
{
MEMORY_BARRIER();
return __compare_and_swap (p, oldval, newval);
}
/* Spinlock implementation; required. */
PT_EI long int testandset (int *spinlock)
{
long int retval;
__asm__ __volatile__ ("1: lwx %0, %1, r0;"
" bnei %0, 2f;"
" addik %0, r0, 1;"
" swx %0, %1, r0;"
" addic %0, r0, 0;"
" bnei %0, 1b;"
"2:"
: "=&r" (retval)
: "r" (spinlock)
: "cc", "memory");
return retval;
}
#endif /* pt-machine.h */
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