[PATCH] tapset: add a tapset function for reading epoch time in ARM

[Jey Jay <rjayavrp2 at gmail dot com>]

gettimeofday_ns() for ARM is implemented to return a fake value because
it depends on get_cycles() which returns 0 in ARM. This patch adds
a tapset function which uses getnstimeofday() for collecting epoch time.

Signed-off-by: Jeyaraman Rangasamy <rjayavrp2@gmail.com>
---
 runtime/time.c                  |    6 ++++++
 tapset/indent-default.stp       |    7 ++++++-
 tapset/linux/timestamp_gtod.stp |   43 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/runtime/time.c b/runtime/time.c
index b4c2012..3d94c6d 100644
--- a/runtime/time.c
+++ b/runtime/time.c
@@ -411,3 +411,9 @@ _stp_gettimeofday_ns(void)

     return base + delta;
 }
+
+static int64_t _stp_getnstimeofday_ns(void){
+ struct timespec ts;
+ getnstimeofday(&ts);
+ return timespec_to_ns(&ts);
+}
diff --git a/tapset/indent-default.stp b/tapset/indent-default.stp
index fb9ff57..d2980f2 100644
--- a/tapset/indent-default.stp
+++ b/tapset/indent-default.stp
@@ -1 +1,6 @@
-function __indent_timestamp() { return gettimeofday_us() }
+function __indent_timestamp() {
+ #if defined (__arm__)
+ return getnstimeofday_us()
+ #endif
+ return gettimeofday_us()
+}
diff --git a/tapset/linux/timestamp_gtod.stp b/tapset/linux/timestamp_gtod.stp
index 668f79b..a16f9b9 100644
--- a/tapset/linux/timestamp_gtod.stp
+++ b/tapset/linux/timestamp_gtod.stp
@@ -55,3 +55,46 @@ function gettimeofday_ms:long () {
 function gettimeofday_s:long () {
   return gettimeofday_ns() / 1000000000;
 }
+
+/**
+ * sfunction getnstimeofday_ns - Number of nanoseconds since UNIX epoch
+ *
+ * Description: This function returns the number of nanoseconds
+ * since the UNIX epoch.
+ */
+function getnstimeofday_ns:long () %{ /* pure */ /* unprivileged */
+
+  STAP_RETVALUE = _stp_getnstimeofday_ns();
+  if (STAP_RETVALUE < 0)
+    CONTEXT->last_error = "getnstimeofday not initialized";
+%}
+
+/**
+ * sfunction getnstimeofday_us - Number of microseconds since UNIX epoch
+ *
+ * Description: This function returns the number of microseconds
+ * since the UNIX epoch.
+ */
+function getnstimeofday_us:long () {
+  return getnstimeofday_ns() / 1000;
+}
+
+/**
+ * sfunction getnstimeofday_ms - Number of milliseconds since UNIX epoch
+ *
+ * Description: This function returns the number of milliseconds
+ * since the UNIX epoch.
+ */
+function getnstimeofday_ms:long () {
+  return getnstimeofday_ns() / 1000000;
+}
+
+/**
+ * sfunction gettimeofday_s - Number of seconds since UNIX epoch
+ *
+ * Description: This function returns the number of seconds since
+ * the UNIX epoch.
+ */
+function getnstimeofday_s:long () {
+  return getnstimeofday_ns() / 1000000000;
+}
-- 
1.7.9.5