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libroot/musl: Import riscv64 atomic_arch.h.

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This commit is contained in:
Augustin Cavalier 2022-06-09 18:46:09 -04:00
parent 36ef2106b7
commit 9690b012b4
1 changed files with 38 additions and 0 deletions
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38
src/system/libroot/posix/musl/arch/riscv64/atomic_arch.h Normal file
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@ -0,0 +1,38 @@
#define a_barrier a_barrier
static inline void a_barrier()
{
__asm__ __volatile__ ("fence rw,rw" : : : "memory");
}
#define a_cas a_cas
static inline int a_cas(volatile int *p, int t, int s)
{
int old, tmp;
__asm__ __volatile__ (
"\n1: lr.w.aqrl %0, (%2)\n"
" bne %0, %3, 1f\n"
" sc.w.aqrl %1, %4, (%2)\n"
" bnez %1, 1b\n"
"1:"
: "=&r"(old), "=&r"(tmp)
: "r"(p), "r"((long)t), "r"((long)s)
: "memory");
return old;
}
#define a_cas_p a_cas_p
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
void *old;
int tmp;
__asm__ __volatile__ (
"\n1: lr.d.aqrl %0, (%2)\n"
" bne %0, %3, 1f\n"
" sc.d.aqrl %1, %4, (%2)\n"
" bnez %1, 1b\n"
"1:"
: "=&r"(old), "=&r"(tmp)
: "r"(p), "r"(t), "r"(s)
: "memory");
return old;
}