diff --git a/kernel/driver.cc b/kernel/driver.cc
index b7f0268db..3c3c399b2 100644
--- a/kernel/driver.cc
+++ b/kernel/driver.cc
@@ -180,7 +180,7 @@ extern char yosys_path[PATH_MAX];
 #endif
 #ifdef YOSYS_ENABLE_TCL
 namespace Yosys {
-	extern int yosys_tcl_iterp_init(Tcl_Interp *interp);
+	extern int yosys_tcl_interp_init(Tcl_Interp *interp);
 	extern void yosys_tcl_activate_repl();
 };
 #endif
@@ -602,7 +602,7 @@ int main(int argc, char **argv)
 	if (run_tcl_shell) {
 #ifdef YOSYS_ENABLE_TCL
 		yosys_tcl_activate_repl();
-		Tcl_Main(argc, argv, yosys_tcl_iterp_init);
+		Tcl_Main(argc, argv, yosys_tcl_interp_init);
 #else
 		log_error("Can't exectue TCL shell: this version of yosys is not built with TCL support enabled.\n");
 #endif
diff --git a/kernel/tclapi.cc b/kernel/tclapi.cc
index e970779d7..8541b8d20 100644
--- a/kernel/tclapi.cc
+++ b/kernel/tclapi.cc
@@ -532,7 +532,65 @@ static int tcl_set_param(ClientData, Tcl_Interp *interp, int objc, Tcl_Obj *cons
 	return TCL_OK;
 }
 
-int yosys_tcl_iterp_init(Tcl_Interp *interp)
+static int sdc_get_pins_cmd(ClientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[])
+{
+	(void)interp;
+	bool hierarchical_flag = false;
+	bool regexp_flag = false;
+	bool nocase_flag = false;
+	std::string separator = "/";
+	Tcl_Obj* of_objects;
+	std::vector<std::string> patterns;
+	int i = 1;
+	for (; i < objc; i++) {
+		FLAG2(hierarchical)
+		FLAG2(regexp)
+		FLAG2(nocase)
+		if (!strcmp(Tcl_GetString(objv[i]), "-hsc")) {
+			i++;
+			separator = Tcl_GetString(objv[i]);
+			continue;
+		}
+		if (!strcmp(Tcl_GetString(objv[i]), "-of_objects")) {
+			i++;
+			of_objects = objv[i];
+			continue;
+		}
+		// Onto the next loop
+		break;
+	}
+	for (; i < objc; i++) {
+		patterns.push_back(Tcl_GetString(objv[i]));
+	}
+	log("get_pins patterns:\n");
+	for (auto pat : patterns) {
+		log("\t%s\n", pat.c_str());
+	}
+	(void)hierarchical_flag;
+	(void)regexp_flag;
+	(void)nocase_flag;
+	(void)separator;
+	(void)of_objects;
+	return TCL_OK;
+}
+static int sdc_dummy_cmd(ClientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[])
+{
+	(void)interp;
+	(void)objc;
+	log("Ignoring known SDC command %s\n", Tcl_GetString(objv[0]));
+	return TCL_OK;
+}
+
+int yosys_sdc_interp_init(Tcl_Interp *interp)
+{
+	if (Tcl_Init(interp)!=TCL_OK)
+		log_warning("Tcl_Init() call failed - %s\n",Tcl_ErrnoMsg(Tcl_GetErrno()));
+	Tcl_CreateObjCommand(interp, "set_false_path", sdc_dummy_cmd, NULL, NULL);
+	Tcl_CreateObjCommand(interp, "get_pins", sdc_get_pins_cmd, NULL, NULL);
+	return TCL_OK;
+}
+
+int yosys_tcl_interp_init(Tcl_Interp *interp)
 {
 	if (Tcl_Init(interp)!=TCL_OK)
 		log_warning("Tcl_Init() call failed - %s\n",Tcl_ErrnoMsg(Tcl_GetErrno()));
diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index 9b0bc92ce..0de242805 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -86,6 +86,7 @@ CellTypes yosys_celltypes;
 
 #ifdef YOSYS_ENABLE_TCL
 Tcl_Interp *yosys_tcl_interp = NULL;
+Tcl_Interp *yosys_sdc_interp = NULL;
 #endif
 
 std::set<std::string> yosys_input_files, yosys_output_files;
@@ -361,16 +362,25 @@ void rewrite_filename(std::string &filename)
 #ifdef YOSYS_ENABLE_TCL
 
 // defined in tclapi.cc
-extern int yosys_tcl_iterp_init(Tcl_Interp *interp);
+extern int yosys_tcl_interp_init(Tcl_Interp *interp);
+extern int yosys_sdc_interp_init(Tcl_Interp *interp);
 
 extern Tcl_Interp *yosys_get_tcl_interp()
 {
 	if (yosys_tcl_interp == NULL) {
 		yosys_tcl_interp = Tcl_CreateInterp();
-		yosys_tcl_iterp_init(yosys_tcl_interp);
+		yosys_tcl_interp_init(yosys_tcl_interp);
 	}
 	return yosys_tcl_interp;
 }
+extern Tcl_Interp *yosys_get_sdc_interp()
+{
+	if (yosys_sdc_interp == NULL) {
+		yosys_sdc_interp = Tcl_CreateInterp();
+		yosys_sdc_interp_init(yosys_sdc_interp);
+	}
+	return yosys_sdc_interp;
+}
 
 struct TclPass : public Pass {
 	TclPass() : Pass("tcl", "execute a TCL script file") { }
@@ -414,6 +424,26 @@ struct TclPass : public Pass {
 		Tcl_Release(interp);
 	}
 } TclPass;
+struct SdcPass : public Pass {
+	SdcPass() : Pass("sdc", "sniff at some SDC") { }
+	void execute(std::vector<std::string> args, RTLIL::Design *) override {
+		if (args.size() < 2)
+			log_cmd_error("Missing script file.\n");
+
+		std::vector<Tcl_Obj*> script_args;
+		for (auto it = args.begin() + 2; it != args.end(); ++it)
+			script_args.push_back(Tcl_NewStringObj((*it).c_str(), (*it).size()));
+
+		Tcl_Interp *interp = yosys_get_sdc_interp();
+		Tcl_Preserve(interp);
+		Tcl_ObjSetVar2(interp, Tcl_NewStringObj("argc", 4), NULL, Tcl_NewIntObj(script_args.size()), 0);
+		Tcl_ObjSetVar2(interp, Tcl_NewStringObj("argv", 4), NULL, Tcl_NewListObj(script_args.size(), script_args.data()), 0);
+		Tcl_ObjSetVar2(interp, Tcl_NewStringObj("argv0", 5), NULL, Tcl_NewStringObj(args[1].c_str(), args[1].size()), 0);
+		if (Tcl_EvalFile(interp, args[1].c_str()) != TCL_OK)
+			log_cmd_error("SDC interpreter returned an error: %s\n", Tcl_GetStringResult(interp));
+		Tcl_Release(interp);
+	}
+} SdcPass;
 #endif
 
 #if defined(__linux__) || defined(__CYGWIN__)