trace: log_output policy that redirects logs to trace

Issue #3714

repos/os/src/lib/trace/policy/log_output/policy.cc

@@ -0,0 +1,46 @@
+#include <util/string.h>
+#include <trace/policy.h>
+
+using namespace Genode;
+
+size_t max_event_size()
+{
+	return 0;
+}
+
+size_t log_output(char *dst, char const *log_message, size_t len)
+{
+	memcpy(dst, (void*)log_message, len);
+	return len;
+}
+
+size_t rpc_call(char *dst, char const *rpc_name, Msgbuf_base const &)
+{
+	return 0;
+}
+
+size_t rpc_returned(char *dst, char const *rpc_name, Msgbuf_base const &)
+{
+	return 0;
+}
+
+size_t rpc_dispatch(char *dst, char const *rpc_name)
+{
+	return 0;
+}
+
+size_t rpc_reply(char *dst, char const *rpc_name)
+{
+	return 0;
+}
+
+size_t signal_submit(char *dst, unsigned const)
+{
+	return 0;
+}
+
+size_t signal_receive(char *dst, Signal_context const &, unsigned)
+{
+	return 0;
+}
+

repos/os/src/lib/trace/policy/log_output/target.mk

@@ -0,0 +1,5 @@
+TARGET = log_output_policy
+
+TARGET_POLICY = log_output
+
+include $(PRG_DIR)/../policy.inc