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stdatomic: Implemented legacy __sync APIs and __atomic_exchange_n

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These APIs are used when the architecture doesn't have atomic
instruction support

Closes https://github.com/espressif/esp-idf/issues/6463
This commit is contained in:
Sachin Parekh
2021-04-22 14:43:54 +05:30
committed by Scott Mabin
parent 5f2fabb2b1
commit 2250da111e
1 changed files with 47 additions and 1 deletions
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48
components/newlib/stdatomic.c
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@@ -60,7 +60,11 @@
portEXIT_CRITICAL_NESTED(state); \ portEXIT_CRITICAL_NESTED(state); \
} while (0) } while (0)
#define NO_ATOMICS_SUPPORT 1 // [todo] Get the equivalent XCHAL_HAVE_S32C1I check for RISCV #ifndef __riscv_atomic // GCC toolchain will define this pre-processor if "A" extension is supported
#define __riscv_atomic 0
#endif
#define NO_ATOMICS_SUPPORT (__riscv_atomic == 0)
#endif #endif
@@ -69,6 +73,15 @@
#define atomic_benchmark_intr_disable() #define atomic_benchmark_intr_disable()
#define atomic_benchmark_intr_restore(STATE) #define atomic_benchmark_intr_restore(STATE)
#define ATOMIC_EXCHANGE(n, type) type __atomic_exchange_ ## n (type* mem, type val, int memorder) \
{ \
unsigned state = _ATOMIC_ENTER_CRITICAL(); \
type ret = *mem; \
*mem = val; \
_ATOMIC_EXIT_CRITICAL(state); \
return ret; \
}
#define CMP_EXCHANGE(n, type) bool __atomic_compare_exchange_ ## n (type* mem, type* expect, type desired, int success, int failure) \ #define CMP_EXCHANGE(n, type) bool __atomic_compare_exchange_ ## n (type* mem, type* expect, type desired, int success, int failure) \
{ \ { \
bool ret = false; \ bool ret = false; \
@@ -128,10 +141,43 @@
return ret; \ return ret; \
} }
#define SYNC_FETCH_OP(op, n, type) type __sync_fetch_and_ ## op ##_ ## n (type* ptr, type value, ...) \
{ \
return __atomic_fetch_ ## op ##_ ## n (ptr, value, __ATOMIC_SEQ_CST); \
}
#define SYNC_BOOL_CMP_EXCHANGE(n, type) bool __sync_bool_compare_and_swap_ ## n (type *ptr, type oldval, type newval, ...) \
{ \
bool ret = false; \
unsigned state = _ATOMIC_ENTER_CRITICAL(); \
if (*ptr == oldval) { \
*ptr = newval; \
ret = true; \
} \
_ATOMIC_EXIT_CRITICAL(state); \
return ret; \
}
#define SYNC_VAL_CMP_EXCHANGE(n, type) type __sync_val_compare_and_swap_ ## n (type *ptr, type oldval, type newval, ...) \
{ \
unsigned state = _ATOMIC_ENTER_CRITICAL(); \
type ret = *ptr; \
if (*ptr == oldval) { \
*ptr = newval; \
} \
_ATOMIC_EXIT_CRITICAL(state); \
return ret; \
}
#pragma GCC diagnostic ignored "-Wbuiltin-declaration-mismatch" #pragma GCC diagnostic ignored "-Wbuiltin-declaration-mismatch"
#if NO_ATOMICS_SUPPORT #if NO_ATOMICS_SUPPORT
ATOMIC_EXCHANGE(1, uint8_t)
ATOMIC_EXCHANGE(2, uint16_t)
ATOMIC_EXCHANGE(4, uint32_t)
ATOMIC_EXCHANGE(8, uint64_t)
CMP_EXCHANGE(1, uint8_t) CMP_EXCHANGE(1, uint8_t)
CMP_EXCHANGE(2, uint16_t) CMP_EXCHANGE(2, uint16_t)
CMP_EXCHANGE(4, uint32_t) CMP_EXCHANGE(4, uint32_t)