Add JavaScript implementation of musl architecture-specific instructions.

1 files changed, 103 insertions, 0 deletions

diff --git a/system/lib/libc/musl/arch/js/atomic.h b/system/lib/libc/musl/arch/js/atomic.h
new file mode 100644
index 00000000..07d5d4b6
--- /dev/null
+++ b/system/lib/libc/musl/arch/js/atomic.h
@@ -0,0 +1,103 @@
+#ifndef _INTERNAL_ATOMIC_H
+#define _INTERNAL_ATOMIC_H
+
+#include <stdint.h>
+
+static inline int a_ctz_l(unsigned long x)
+{
+	if (x == 0)
+		return 32;
+	int nTrailingZeros = 0;
+	while(!(x&1))
+	{
+		++nTrailingZeros;
+		x >>= 1;
+	}
+	return nTrailingZeros;
+}
+
+static inline int a_ctz_64(uint64_t x)
+{
+	uint32_t lo = (uint32_t)x;
+	if (lo == 0)
+		return a_ctz_l((unsigned long)(x >> 32)) + 32;
+	else
+		return a_ctz_l((unsigned long)lo);
+}
+
+static inline void a_and_64(volatile uint64_t *p, uint64_t v)
+{
+	*p &= v;
+}
+
+static inline void a_or_64(volatile uint64_t *p, uint64_t v)
+{
+	*p |= v;
+}
+
+static inline void a_store_l(volatile void *p, long x)
+{
+	*(long*)p = x;
+}
+
+static inline void a_or_l(volatile void *p, long v)
+{
+	*(long*)p |= v;
+}
+
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+	if (*(long*)p == t)
+		*(long*)p = s;
+	return t;
+}
+
+static inline long a_cas_l(volatile void *p, long t, long s)
+{
+	if (*(long*)p == t)
+		*(long*)p = s;
+	return t;
+}
+
+static inline int a_cas(volatile int *p, int t, int s)
+{
+	if (*p == t)
+		*p = s;
+	return t;
+}
+
+static inline void a_or(volatile void *p, int v)
+{
+	*(int*)p |= v;
+}
+
+static inline void a_and(volatile void *p, int v)
+{
+	*(int*)p &= v;
+}
+
+static inline void a_inc(volatile int *x)
+{
+	++*x;
+}
+
+static inline void a_dec(volatile int *x)
+{
+	--*x;
+}
+
+static inline void a_store(volatile int *p, int x)
+{
+	*p = x;
+}
+
+static inline void a_spin()
+{
+}
+
+static inline void a_crash()
+{
+}
+
+
+#endif