RISC-V: Moved syscalls to separate files to fix aliasing problems.

libgloss/riscv/sys_gettimeofday.c

@@ -0,0 +1,10 @@
+#include <machine/syscall.h>
+#include <sys/time.h>
+#include "internal_syscall.h"
+
+/* Get the current time.  Only relatively correct.  */
+int
+_gettimeofday(struct timeval *tp, void *tzp)
+{
+  return syscall_errno (SYS_gettimeofday, tp, 0, 0, 0, 0, 0);
+}