1 files changed, 27 insertions, 0 deletions
diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c
new file mode 100644
index 000000000..43168fb0d
--- /dev/null
+++ b/tools/perf/util/perf_regs.c
@@ -0,0 +1,27 @@
+#include <errno.h>
+#include "perf_regs.h"
+#include "event.h"
+
+int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
+{
+	int i, idx = 0;
+	u64 mask = regs->mask;
+
+	if (regs->cache_mask & (1 << id))
+		goto out;
+
+	if (!(mask & (1 << id)))
+		return -EINVAL;
+
+	for (i = 0; i < id; i++) {
+		if (mask & (1 << i))
+			idx++;
+	}
+
+	regs->cache_mask |= (1 << id);
+	regs->cache_regs[id] = regs->regs[idx];
+
+out:
+	*valp = regs->cache_regs[id];
+	return 0;
+}