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

libgloss/riscv/sys_times.c

@@ -0,0 +1,37 @@
+#include <machine/syscall.h>
+#include <sys/types.h>
+#include <sys/times.h>
+#include <sys/time.h>
+#include "internal_syscall.h"
+
+extern int _gettimeofday(struct timeval *, void *);
+
+/* Timing information for current process. From
+   newlib/libc/include/sys/times.h the tms struct fields are as follows:
+
+   - clock_t tms_utime  : user clock ticks
+   - clock_t tms_stime  : system clock ticks
+   - clock_t tms_cutime : children's user clock ticks
+   - clock_t tms_cstime : children's system clock ticks
+
+   Since maven does not currently support processes we set both of the
+   children's times to zero. Eventually we might want to separately
+   account for user vs system time, but for now we just return the total
+   number of cycles since starting the program.  */
+clock_t
+_times(struct tms *buf)
+{
+  // when called for the first time, initialize t0
+  static struct timeval t0;
+  if (t0.tv_sec == 0)
+    _gettimeofday (&t0, 0);
+
+  struct timeval t;
+  _gettimeofday (&t, 0);
+
+  long long utime = (t.tv_sec - t0.tv_sec) * 1000000 + (t.tv_usec - t0.tv_usec);
+  buf->tms_utime = utime * CLOCKS_PER_SEC / 1000000;
+  buf->tms_stime = buf->tms_cstime = buf->tms_cutime = 0;
+
+  return -1;
+}