Second try: Introduce plugin_crt0.c that every plugin links.

It handles exit() properly, calling the handler also when the plugin returns
normally (also make exit() more standard compliant while at it).
It also holds PLUGIN_HEADER, so that it doesn't need to be in each plugin anymore.

To work better together with callbacks passed to rb->default_event_handler_ex() introduce exit_on_usb() which will call the exit handler before showing the usb screen and exit() after it.
In most cases rb->default_event_handler_ex() was passed a callback which was manually called at all other return points. This can now be done via atexit().

In future plugin_crt0.c could also handle clearing bss, initializing iram and more.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27873 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 4 deletions

diff --git a/apps/plugins/plugins.make b/apps/plugins/plugins.make
index 532dba68c0..ed432d92be 100644
--- a/apps/plugins/plugins.make
+++ b/apps/plugins/plugins.make
@@ -33,7 +33,7 @@ PLUGIN_LDS := $(APPSDIR)/plugins/plugin.lds
 PLUGINLINK_LDS := $(BUILDDIR)/apps/plugins/plugin.link
 OVERLAYREF_LDS := $(BUILDDIR)/apps/plugins/overlay_ref.link
 endif
-
+PLUGIN_CRT0 := $(BUILDDIR)/apps/plugins/plugin_crt0.o
 # multifile plugins (subdirs):
 PLUGINSUBDIRS := $(call preprocess, $(APPSDIR)/plugins/SUBDIRS)
 
@@ -49,7 +49,7 @@ PLUGINFLAGS = -I$(APPSDIR)/plugins -DPLUGIN $(CFLAGS)
 $(ROCKS1): $(BUILDDIR)/%.rock: $(BUILDDIR)/%.o
 
 # dependency for all plugins
-$(ROCKS): $(APPSDIR)/plugin.h $(PLUGINLINK_LDS) $(PLUGINLIB) $(PLUGINBITMAPLIB)
+$(ROCKS): $(APPSDIR)/plugin.h $(PLUGINLINK_LDS) $(PLUGINLIB) $(PLUGINBITMAPLIB) $(PLUGIN_CRT0) $(LIBSETJMP)
 
 $(PLUGINLIB): $(PLUGINLIB_OBJ)
         $(SILENT)$(shell rm -f $@)
@@ -89,7 +89,7 @@ else
 endif
 PLUGINLDFLAGS += $(GLOBAL_LDOPTS)
 
-$(BUILDDIR)/%.rock: $(LIBSETJMP)
+$(BUILDDIR)/%.rock:
         $(call PRINTS,LD $(@F))$(CC) $(PLUGINFLAGS) -o $(BUILDDIR)/$*.elf \
                 $(filter %.o, $^) \
                 $(filter %.a, $+) \
@@ -103,7 +103,7 @@ endif
 $(BUILDDIR)/apps/plugins/%.lua: $(ROOTDIR)/apps/plugins/%.lua
         $(call PRINTS,CP $(subst $(ROOTDIR)/,,$<))cp $< $(BUILDDIR)/apps/plugins/
 
-$(BUILDDIR)/%.refmap: $(APPSDIR)/plugin.h $(OVERLAYREF_LDS) $(PLUGINLIB) $(PLUGINBITMAPLIB)
+$(BUILDDIR)/%.refmap: $(APPSDIR)/plugin.h $(OVERLAYREF_LDS) $(PLUGINLIB) $(PLUGINBITMAPLIB) $(LIBSETJMP) $(PLUGIN_CRT0)
         $(call PRINTS,LD $(@F))$(CC) $(PLUGINFLAGS) -o /dev/null \
                 $(filter %.o, $^) \
                 $(filter %.a, $+) \