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Add impl of atomic_fetch_*

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WangRunji 2018-10-26 02:31:05 +08:00
parent 0680023e35
commit 95ab9caba1
1 changed files with 12 additions and 0 deletions
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12
kernel/src/arch/riscv32/compiler_rt.c
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@ -46,4 +46,16 @@ char __atomic_compare_exchange_4(int* dst, int* expected, int desired) {
return sc_ret == 0;
}
return 0;
}
int __atomic_fetch_add_4(int* ptr, int val) {
int res;
__asm__ __volatile__("amoadd.w.rl %0, %1, (%2)" : "=r"(res) : "r"(val), "r"(ptr) : "memory");
return res;
}
int __atomic_fetch_sub_4(int* ptr, int val) {
int res;
__asm__ __volatile__("amoadd.w.rl %0, %1, (%2)" : "=r"(res) : "r"(-val), "r"(ptr) : "memory");
return res;
}