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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-common-lib
* Created on: 31 мар. 2020 г.
*
* lsp-common-lib 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 3 of the License, or
* any later version.
*
* lsp-common-lib 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 lsp-common-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_COMMON_ARCH_ARM_ATOMIC_H_
#define LSP_PLUG_IN_COMMON_ARCH_ARM_ATOMIC_H_
#ifndef LSP_PLUG_IN_COMMON_ATOMIC_IMPL
#error "This file should not be included directly"
#endif /* LSP_PLUG_IN_COMMON_ATOMIC_IMPL */
#define ATOMIC_CAS_DEF(type, qsz, extra) \
inline type atomic_cas(extra type *ptr, type exp, type rep) \
{ \
type tmp; \
\
ARCH_ARM_ASM \
( \
IF_ARCH_LEAST_ARM7(__ASM_EMIT("dmb")) \
__ASM_EMIT("ldr" qsz " %[tmp], [%[ptr]]") \
__ASM_EMIT("teq %[tmp], %[exp]") \
__ASM_EMIT("str" qsz "eq %[tmp], %[rep], [%[ptr]]") \
__ASM_EMIT("movne %[tmp], $1") \
__ASM_EMIT("eor %[tmp], $1") \
: [tmp] "=&r" (tmp) \
: [ptr] "r" (ptr), [exp] "r" (exp), [rep] "r" (rep) \
: "cc", "memory" \
); \
return tmp; \
}
namespace lsp
{
ATOMIC_CAS_DEF(int8_t, "exb", )
ATOMIC_CAS_DEF(int8_t, "exb", volatile)
ATOMIC_CAS_DEF(uint8_t, "exb", )
ATOMIC_CAS_DEF(uint8_t, "exb", volatile)
ATOMIC_CAS_DEF(int16_t, "exh", )
ATOMIC_CAS_DEF(int16_t, "exh", volatile)
ATOMIC_CAS_DEF(uint16_t, "exh", )
ATOMIC_CAS_DEF(uint16_t, "exh", volatile)
ATOMIC_CAS_DEF(int32_t, "ex", )
ATOMIC_CAS_DEF(int32_t, "ex", volatile)
ATOMIC_CAS_DEF(uint32_t, "ex", )
ATOMIC_CAS_DEF(uint32_t, "ex", volatile)
ATOMIC_CAS_DEF(void *, "ex", )
ATOMIC_CAS_DEF(void *, "ex", volatile)
}
#undef ATOMIC_CAS_DEF
#define ATOMIC_ADD_DEF(type, qsz, extra) \
inline type atomic_add(extra type *ptr, type value) \
{ \
type tmp, sum, retval; \
\
ARCH_ARM_ASM \
( \
__ASM_EMIT("1:") \
IF_ARCH_LEAST_ARM7(__ASM_EMIT("dmb")) \
__ASM_EMIT("ldr" qsz " %[ret], [%[ptr]]") \
__ASM_EMIT("add %[sum], %[ret], %[src]") \
__ASM_EMIT("str" qsz " %[tmp], %[sum], [%[ptr]]") \
__ASM_EMIT("tst %[tmp], %[tmp]") \
__ASM_EMIT("bne 1b") \
: [tmp] "=&r" (tmp), \
[sum] "=&r" (sum), \
[ret] "=&r" (retval) \
: [ptr] "r" (ptr), \
[src] "r" (value) \
: "memory", "cc" \
); \
return retval; \
}
namespace lsp
{
ATOMIC_ADD_DEF(int8_t, "exb", )
ATOMIC_ADD_DEF(int8_t, "exb", volatile)
ATOMIC_ADD_DEF(uint8_t, "exb", )
ATOMIC_ADD_DEF(uint8_t, "exb", volatile)
ATOMIC_ADD_DEF(int16_t, "exh", )
ATOMIC_ADD_DEF(int16_t, "exh", volatile)
ATOMIC_ADD_DEF(uint16_t, "exh", )
ATOMIC_ADD_DEF(uint16_t, "exh", volatile)
ATOMIC_ADD_DEF(int32_t, "ex", )
ATOMIC_ADD_DEF(int32_t, "ex", volatile)
ATOMIC_ADD_DEF(uint32_t, "ex", )
ATOMIC_ADD_DEF(uint32_t, "ex", volatile)
}
#undef ATOMIC_ADD_DEF
#define ATOMIC_SWAP_DEF(type, qsz, extra) \
inline type atomic_swap(extra type *ptr, type value) \
{ \
type tmp; \
type retval; \
\
ARCH_ARM_ASM \
( \
__ASM_EMIT("1:") \
IF_ARCH_LEAST_ARM7(__ASM_EMIT("dmb")) \
__ASM_EMIT("ldr" qsz " %[ret], [%[ptr]]") \
__ASM_EMIT("str" qsz " %[tmp], %[src], [%[ptr]]") \
__ASM_EMIT("tst %[tmp], %[tmp]") \
__ASM_EMIT("bne 1b") \
: [tmp] "=&r" (tmp), \
[ret] "=&r" (retval) \
: [ptr] "r" (ptr), \
[src] "r" (value) \
: "memory", "cc" \
); \
return retval; \
}
namespace lsp
{
ATOMIC_SWAP_DEF(int8_t, "exb", )
ATOMIC_SWAP_DEF(int8_t, "exb", volatile)
ATOMIC_SWAP_DEF(uint8_t, "exb", )
ATOMIC_SWAP_DEF(uint8_t, "exb", volatile)
ATOMIC_SWAP_DEF(int16_t, "exh", )
ATOMIC_SWAP_DEF(int16_t, "exh", volatile)
ATOMIC_SWAP_DEF(uint16_t, "exh", )
ATOMIC_SWAP_DEF(uint16_t, "exh", volatile)
ATOMIC_SWAP_DEF(int32_t, "ex", )
ATOMIC_SWAP_DEF(int32_t, "ex", volatile)
ATOMIC_SWAP_DEF(uint32_t, "ex", )
ATOMIC_SWAP_DEF(uint32_t, "ex", volatile)
ATOMIC_SWAP_DEF(void *, "ex", )
ATOMIC_SWAP_DEF(void *, "ex", volatile)
}
#undef ATOMIC_SWAP_DEF
//-----------------------------------------------------------------------------
// Atomic operations
namespace lsp
{
template <class type_t>
inline void atomic_init(type_t &lk) { lk = 1; }
template <class type_t>
inline type_t atomic_trylock(type_t &lk) { return atomic_cas(&lk, 1, 0); }
template <class type_t>
inline type_t atomic_unlock(type_t &lk) { return atomic_swap(&lk, 1); }
}
#endif /* INCLUDE_LSP_PLUG_IN_COMMON_ARCH_ARM_ATOMIC_H_ */
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