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/* Low-level functions for atomic operations. Nios II version.
Copyright (C) 2012-2024 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, see
<https://www.gnu.org/licenses/>. */
#ifndef _NIOS2_ATOMIC_MACHINE_H
#define _NIOS2_ATOMIC_MACHINE_H 1
#define __HAVE_64B_ATOMICS 0
#define USE_ATOMIC_COMPILER_BUILTINS 0
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS 1
#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
(abort (), (__typeof (*mem)) 0)
#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
(abort (), (__typeof (*mem)) 0)
#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
(abort (), (__typeof (*mem)) 0)
#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({ \
register int r2 asm ("r2"); \
register int* r4 asm ("r4") = (int*)(mem); \
register int r5 asm ("r5"); \
register int r6 asm ("r6") = (int)(newval); \
int retval, orig_oldval = (int)(oldval); \
long kernel_cmpxchg = 0x1004; \
while (1) \
{ \
r5 = *r4; \
if (r5 != orig_oldval) \
{ \
retval = r5; \
break; \
} \
asm volatile ("callr %1\n" \
: "=r" (r2) \
: "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
: "ra", "memory"); \
if (!r2) { retval = orig_oldval; break; } \
} \
(__typeof (*(mem))) retval; \
})
#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
({ \
register int r2 asm ("r2"); \
register int *r4 asm ("r4") = (int*)(mem); \
register int r5 asm ("r5") = (int)(oldval); \
register int r6 asm ("r6") = (int)(newval); \
long kernel_cmpxchg = 0x1004; \
asm volatile ("callr %1\n" \
: "=r" (r2) \
: "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
: "ra", "memory"); \
r2; \
})
#define atomic_full_barrier() ({ asm volatile ("sync"); })
#endif /* _NIOS2_ATOMIC_MACHINE_H */
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