perf tools: Add machine__kernel_ip()
Add a function to determine if an address is in the kernel. This is
based on the kernel function kernel_ip().
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1408129739-17368-5-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 37f8dc5..e00daf0 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -32,6 +32,7 @@
machine->symbol_filter = NULL;
machine->id_hdr_size = 0;
machine->comm_exec = false;
+ machine->kernel_start = 0;
machine->root_dir = strdup(root_dir);
if (machine->root_dir == NULL)
@@ -1559,3 +1560,25 @@
return 0;
}
+
+int machine__get_kernel_start(struct machine *machine)
+{
+ struct map *map = machine__kernel_map(machine, MAP__FUNCTION);
+ int err = 0;
+
+ /*
+ * The only addresses above 2^63 are kernel addresses of a 64-bit
+ * kernel. Note that addresses are unsigned so that on a 32-bit system
+ * all addresses including kernel addresses are less than 2^32. In
+ * that case (32-bit system), if the kernel mapping is unknown, all
+ * addresses will be assumed to be in user space - see
+ * machine__kernel_ip().
+ */
+ machine->kernel_start = 1ULL << 63;
+ if (map) {
+ err = map__load(map, machine->symbol_filter);
+ if (map->start)
+ machine->kernel_start = map->start;
+ }
+ return err;
+}