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/* Low-level functions for atomic operations. H8/300 version.
Copyright (C) 1997, 2000, 2001 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 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; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _ATOMICITY_H
#define _ATOMICITY_H 1
#include <inttypes.h>
static inline uint32_t
__attribute__ ((unused))
exchange_and_add (volatile uint32_t *mem, uint32_t val)
{
uint32_t result;
__asm__ __volatile__ ("stc ccr,@-sp\n\t"
"orc #0x80,ccr\n\t"
"mov.l %1,er1\n\t"
"mov.l %0,%1\n\t"
"add.l er1,%0\n\t"
"ldc @sp+,ccr"
: "=r" (result), "=m" (*mem)
: "0" (val), "1" (*mem)
: "er1");
return result;
}
static inline void
__attribute__ ((unused))
atomic_add (volatile uint32_t *mem, int val)
{
__asm__ __volatile__ ("stc ccr,@-sp\n\t"
"orc #0x80,ccr\n\t"
"mov.l %0,er0\n\t"
"add %1,er0\n\t"
"mov.l er0,%0\n\t"
"ldc @sp+,ccr"
: "=m" (*mem)
: "r" (val), "0" (*mem)
: "er0");
}
static inline int
__attribute__ ((unused))
compare_and_swap (volatile long int *p, long int oldval, long int newval)
{
int ret = 0;
__asm__ __volatile__ ("stc ccr,@-sp\n\t"
"orc #0x80,ccr\n\t"
"mov.l %1,er0\n\t"
"cmp.l %2,er0\n\t"
"bne 1f\n\t"
"mov.l %3,%1\n\t"
"inc.l #1,%0\n"
"1:\n\t"
"ldc @sp+,ccr"
: "=r"(ret),"=m"(*p)
: "r"(oldval),"r"(newval),"0"(ret),"1"(*p)
: "er0");
return ret;
}
#endif /* atomicity.h */
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