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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 by Thomas Martitz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include <setjmp.h>
PLUGIN_HEADER
/*
* EXIT_MAGIC magic, because 0 cannot be used due to setjmp()
* must be > 0
*/
#define EXIT_MAGIC 0x0CDEBABE
extern enum plugin_status plugin_start(const void*);
extern unsigned char plugin_bss_start[];
extern unsigned char plugin_end_addr[];
static jmp_buf __exit_env;
/* only 1 atexit handler for now, chain in the exit handler if you need more */
static void (*atexit_handler)(void);
int rb_atexit(void (*fn)(void))
{
if (atexit_handler)
return -1;
atexit_handler = fn;
return 0;
}
void exit(int status)
{ /* jump back in time to before starting the plugin */
longjmp(__exit_env, status != 0 ? status : EXIT_MAGIC);
}
void _exit(int status)
{ /* don't call exit handler */
atexit_handler = NULL;
exit(status);
}
enum plugin_status plugin__start(const void *param)
{
int exit_ret;
enum plugin_status ret;
#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
/* IRAM must be copied before clearing the BSS ! */
#ifdef PLUGIN_USE_IRAM
extern char iramcopy[], iramstart[], iramend[], iedata[], iend[];
size_t iram_size = iramend - iramstart;
size_t ibss_size = iend - iedata;
if (iram_size > 0 || ibss_size > 0)
{
/* We need to stop audio playback in order to use codec IRAM */
rb->audio_stop();
rb->memcpy(iramstart, iramcopy, iram_size);
rb->memset(iedata, 0, ibss_size);
/* make the icache (if it exists) up to date with the new code */
rb->commit_discard_idcache();
/* barrier to prevent reordering iram copy and BSS clearing,
* because the BSS segment alias the IRAM copy.
*/
asm volatile ("" ::: "memory");
}
#endif /* PLUGIN_USE_IRAM */
/* zero out the bss section */
rb->memset(plugin_bss_start, 0, plugin_end_addr - plugin_bss_start);
/* Some parts of bss may be used via a no-cache alias (at least
* portalplayer has this). If we don't clear the cache, those aliases
* may read garbage */
rb->commit_dcache();
#endif
/* we come back here if exit() was called or the plugin returned normally */
exit_ret = setjmp(__exit_env);
if (exit_ret == 0)
{ /* start the plugin */
ret = plugin_start(param);
}
else
{ /* plugin exit via exit() */
if (exit_ret == EXIT_MAGIC)
{ /* exit(EXIT_SUCCESS) */
ret = PLUGIN_OK;
}
else if (exit_ret < INTERNAL_PLUGIN_RETVAL_START)
{ /* exit(EXIT_FAILURE) */
ret = PLUGIN_ERROR;
}
else
{ /* exit(PLUGIN_XXX) */
ret = (enum plugin_status)exit_ret;
}
}
/* before finishing, call the exit handler if there was one */
if (atexit_handler != NULL)
atexit_handler();
return ret;
}
static void cleanup_wrapper(void *param)
{
(void)param;
if (atexit_handler)
atexit_handler();
}
void exit_on_usb(int button)
{ /* the default handler will call the exit handler before
* showing the usb screen; after that we don't want the exit handler
* to be called a second time, hence _exit()
*
* if not usb, then the handler will only be called if powering off
* if poweroff, the plugin doesn't want to run any further so exit as well*/
long result = rb->default_event_handler_ex(button, cleanup_wrapper, NULL);
if (result == SYS_USB_CONNECTED)
_exit(PLUGIN_USB_CONNECTED);
else if (result == SYS_POWEROFF)
_exit(PLUGIN_POWEROFF);
}
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