[MINIOS] Clean up final link stage of the build.

Allow extra application objects to be linked against a partial link of
minios with non-global names localised. For now we assume that global
names ill be assigned a xenos_ prefix in due course. We may decide to
choose a different prefix.

Those who wish to finish the link from an external Makefile can link
their own objects against mini-os.o (which must be first in link
order!) and specify the appropriate architecture linker script.

Signed-off-by: Keir Fraser <keir@xensource.com>

.hgignore

@@ -58,7 +58,7 @@
 ^docs/xen-api/xenapi-datamodel-graph.eps$
 ^extras/mini-os/h/hypervisor-ifs$
 ^extras/mini-os/h/xen-public$
-^extras/mini-os/mini-os\..*$
+^extras/mini-os/mini-os.*$
 ^install/.*$
 ^linux-[^/]*-native/.*$
 ^linux-[^/]*-xen/.*$

extras/mini-os/Makefile

@@ -17,7 +17,13 @@ CFLAGS += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION)
 ASFLAGS = -D__ASSEMBLY__
 
 LDLIBS =  -L. -lminios
-LDFLAGS := -N -T minios-$(TARGET_ARCH).lds
+LDFLAGS_FINAL := -N -T minios-$(TARGET_ARCH).lds
+LDFLAGS :=
+
+# Prefix for global API names. All other symbols are localised before
+# linking with EXTRA_OBJS.
+GLOBAL_PREFIX := xenos_
+EXTRA_OBJS =
 
 # For possible special source directories.
 EXTRA_SRC =
@@ -110,18 +116,16 @@ endif
 links:	$(ARCH_LINKS)
 	[ -e include/xen ] || ln -sf ../../../xen/include/public include/xen
 
-libminios.a: links $(OBJS) $(HEAD)
-	$(AR) r libminios.a $(HEAD) $(OBJS)
-
-$(TARGET): libminios.a $(HEAD)
-	$(LD) $(LDFLAGS) $(HEAD) $(LDLIBS) -o $@.elf
-	gzip -f -9 -c $@.elf >$@.gz
+$(TARGET): links $(OBJS) $(HEAD)
+	$(LD) -r $(LDFLAGS) $(HEAD) $(OBJS) -o $@.o
+	$(OBJCOPY) -w -G $(GLOBAL_PREFIX)* -G _start $@.o $@.o
+	$(LD) $(LDFLAGS) $(LDFLAGS_FINAL) $@.o $(EXTRA_OBJS) -o $@
+	gzip -f -9 -c $@ >$@.gz
 
 .PHONY: clean
 clean:
 	find . -type f -name '*.o' | xargs rm -f
-	rm -f *.o *~ core $(TARGET).elf $(TARGET).raw $(TARGET) $(TARGET).gz
-	rm -f libminios.a
+	rm -f *.o *~ core $(TARGET) $(TARGET).gz
 	find . -type l | xargs rm -f
 	rm -f tags TAGS