use later jasmin version that can issue proper syscalls and can generate asm code without ret

Makefile

@@ -2,13 +2,15 @@ JC ?= jasminc
 CC ?= gcc
 MAKE ?= make
 
+JASMIN_ARGS = -protect-calls -return-address-kind mmx
+
 .PHONY: clean run
 
 all: build
 	@true
 
-build: build/agent.o syscall/jasmin_syscall.o
-	ar -crs build/libagent.a build/agent.o syscall/jasmin_syscall.o
+build: build/agent.o
+	ar -crs build/libagent.a build/agent.o
 
 build/%.o: build/%.S
 	$(CC) $< -c -o $@
@@ -18,7 +20,6 @@ clean:
 	$(MAKE) -C syscall clean
 
 build/%.S: src/%.jazz
-	$(JC) $< -o $@
-
-syscall/jasmin_syscall.o: syscall/jasmin_syscall.c syscall/jasmin_syscall.h
-	$(MAKE) -C syscall
+	$(JC) $(JASMIN_ARGS) $< -o $@
+	# remove the remaining ret calls to make sure that we don't execute any return. Those returns should not be called anyways due to the infinit loop
+	sed -i 's/ret/hlt/g' $@