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

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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
This commit is contained in:
Thomas Martitz 2010-08-24 14:30:46 +00:00
parent 3478bc5d6d
commit cae4ae2c71
142 changed files with 372 additions and 341 deletions
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18
apps/plugin.h
View file

@ -147,17 +147,21 @@ void* plugin_get_buffer(size_t *buffer_size);
#define PLUGIN_MAGIC 0x526F634B /* RocK */
/* increase this every time the api struct changes */
#define PLUGIN_API_VERSION 190
#define PLUGIN_API_VERSION 191
/* update this to latest version if a change to the api struct breaks
backwards compatibility (and please take the opportunity to sort in any
new function which are "waiting" at the end of the function table) */
#define PLUGIN_MIN_API_VERSION 190
#define PLUGIN_MIN_API_VERSION 191
/* plugin return codes */
/* internal returns start at 0x100 to make exit(1..255) work */
#define INTERNAL_PLUGIN_RETVAL_START 0x100
enum plugin_status {
PLUGIN_OK = 0,
PLUGIN_USB_CONNECTED,
PLUGIN_OK = 0, /* PLUGIN_OK == EXIT_SUCCESS */
/* 1...255 reserved for exit() */
PLUGIN_USB_CONNECTED = INTERNAL_PLUGIN_RETVAL_START,
PLUGIN_POWEROFF,
PLUGIN_GOTO_WPS,
PLUGIN_ERROR = -1,
};
@ -912,14 +916,14 @@ extern unsigned char plugin_end_addr[];
const struct plugin_header __header \
__attribute__ ((section (".header")))= { \
PLUGIN_MAGIC, TARGET_ID, PLUGIN_API_VERSION, \
plugin_start_addr, plugin_end_addr, plugin_start, &rb };
plugin_start_addr, plugin_end_addr, plugin__start, &rb };
#else /* PLATFORM_HOSTED */
#define PLUGIN_HEADER \
const struct plugin_api *rb DATA_ATTR; \
const struct plugin_header __header \
__attribute__((visibility("default"))) = { \
PLUGIN_MAGIC, TARGET_ID, PLUGIN_API_VERSION, \
NULL, NULL, plugin_start, &rb };
NULL, NULL, plugin__start, &rb };
#endif /* CONFIG_PLATFORM */
#ifdef PLUGIN_USE_IRAM
@ -954,7 +958,7 @@ void plugin_tsr(bool (*exit_callback)(bool reenter));
/* defined by the plugin */
extern const struct plugin_api *rb;
enum plugin_status plugin_start(const void* parameter)
enum plugin_status plugin__start(const void* parameter)
NO_PROF_ATTR;
#endif /* __PCTOOL__ */