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96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/* Low-level functions for atomic operations. Nios II version.
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Copyright (C) 2012-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _NIOS2_ATOMIC_MACHINE_H
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#define _NIOS2_ATOMIC_MACHINE_H 1
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#include <stdint.h>
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typedef int32_t atomic32_t;
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typedef uint32_t uatomic32_t;
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typedef int_fast32_t atomic_fast32_t;
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typedef uint_fast32_t uatomic_fast32_t;
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typedef intptr_t atomicptr_t;
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typedef uintptr_t uatomicptr_t;
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typedef intmax_t atomic_max_t;
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typedef uintmax_t uatomic_max_t;
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#define __HAVE_64B_ATOMICS 0
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#define USE_ATOMIC_COMPILER_BUILTINS 0
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/* XXX Is this actually correct? */
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#define ATOMIC_EXCHANGE_USES_CAS 1
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#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
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({ \
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register int r2 asm ("r2"); \
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register int* r4 asm ("r4") = (int*)(mem); \
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register int r5 asm ("r5"); \
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register int r6 asm ("r6") = (int)(newval); \
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int retval, orig_oldval = (int)(oldval); \
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long kernel_cmpxchg = 0x1004; \
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while (1) \
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{ \
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r5 = *r4; \
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if (r5 != orig_oldval) \
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{ \
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retval = r5; \
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break; \
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} \
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asm volatile ("callr %1\n" \
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: "=r" (r2) \
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: "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
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: "ra", "memory"); \
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if (!r2) { retval = orig_oldval; break; } \
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} \
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(__typeof (*(mem))) retval; \
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})
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#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
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({ \
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register int r2 asm ("r2"); \
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register int *r4 asm ("r4") = (int*)(mem); \
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register int r5 asm ("r5") = (int)(oldval); \
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register int r6 asm ("r6") = (int)(newval); \
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long kernel_cmpxchg = 0x1004; \
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asm volatile ("callr %1\n" \
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: "=r" (r2) \
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: "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \
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: "ra", "memory"); \
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r2; \
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})
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#define atomic_full_barrier() ({ asm volatile ("sync"); })
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#endif /* _NIOS2_ATOMIC_MACHINE_H */
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