diff --git a/sys/ld/CMakeLists.txt b/sys/ld/CMakeLists.txt
index 685b4e7..68fca4d 100644
--- a/sys/ld/CMakeLists.txt
+++ b/sys/ld/CMakeLists.txt
@@ -9,7 +9,7 @@ set_target_properties(ld PROPERTIES
 	OUTPUT_NAME "ld64"
 	SUFFIX ".so")
 
-target_link_libraries(ld ulibc libmango libmsg-fs)
+target_link_libraries(ld ulibc libmango interface::fs)
 
 target_compile_options(ld PRIVATE
 	-fPIC -fno-stack-protector -nostdlib -ffreestanding)
diff --git a/sys/ld/arch/x86_64/start.S b/sys/ld/arch/x86_64/start.S
index 45ef52b..f600396 100644
--- a/sys/ld/arch/x86_64/start.S
+++ b/sys/ld/arch/x86_64/start.S
@@ -6,10 +6,12 @@
 .extern main
 .type main, @function
 
-.extern exit
-.type exit, @function
+.extern task_exit
+.type task_exit, @function
 
 _start:
 	call main
+	mov %rax, %rdi
+	call task_exit
 1:	pause
 	jmp 1b
diff --git a/sys/ld/main.c b/sys/ld/main.c
index f40d99c..4db2bc1 100644
--- a/sys/ld/main.c
+++ b/sys/ld/main.c
@@ -1,7 +1,9 @@
+#define MSG_IMPLEMENTATION
+
 #include <mango/log.h>
 #include <mango/msg.h>
 #include <mango/types.h>
-#include <rosetta/msg/fs.h>
+#include <rosetta/fs.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -14,7 +16,6 @@ int main(
 	kern_handle_t address_space,
 	uintptr_t bsp_base)
 {
-	kern_log("ld!");
 	void *brk = sbrk(0);
 	kern_logf("brk=%p", brk);
 
@@ -36,19 +37,24 @@ int main(
 #if 1
 	port_connect(port, 0, 0);
 
+	const char *str = "hello";
+	char new_buf[512] = {0};
+	struct msg_string new = {.str_buf = new_buf, .str_max = sizeof new_buf};
+	kern_logf("sending msg: uppercase(%s)", str);
+	status = fs_uppercase(port, str, &new);
+	kern_logf("uppercase(%s) = %s", str, new_buf);
+
 	const char *path = "/usr/lib/libc.so";
 	int flags = 4;
 	int err = 0;
 
-	kern_logf("calling open(%s, %d)", path, flags);
-	status = rosetta_msg_fs_open_send(port, path, flags, &err);
+	kern_logf("sending msg: open(%s, %d)", path, flags);
+	status = fs_open(port, path, flags, &err);
 
 	if (status != KERN_OK) {
 		kern_logf("open call failed (status %d)", status);
-	} else if (err != 0) {
-		kern_logf("open call returned error %d", err);
-	} else {
-		kern_logf("open call succeeded");
+	} else  {
+		kern_logf("open(%s, %d) = %d", path, flags, err);
 	}
 
 #endif