Add syscalls

Makefile

@@ -10,8 +10,8 @@ all: build
 build: build/agent.o
 	ar -crs build/libagent.a build/agent.o
 
-build/%.o: build/%.S
-	$(CC) $< -c -o $@
+build/%.o: build/%.S syscall/jasmin_syscall.o
+	$(CC) $< syscall/jasmin_syscall.o -c -o $@
 
 clean:
 	rm build/* 2> /dev/null || true
@@ -21,3 +21,6 @@ $(JC):
 
 build/%.S: src/%.jazz $(JC)
 	JASMINPATH="Jade=libjade/src/" $(JC) $< -o $@
+
+syscall/jasmin_syscall.o: syscall/jasmin_syscall.c syscall/jasmin_syscall.h
+	$(MAKE) -C syscall