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Plugins: modify IRAM copying code

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Move to plugin_crt0.c, plugins don't need PLUGIN_IRAM_* macros anymore
IRAM is no longered zeroed before copying (as it is at the same address
than BSS) -> Fix FS#11581
Use cpucache_invalidate() (and not cpucache_flush), needed for self-modifying code on cached IRAM

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27948 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-08-30 20:47:53 +00:00
parent a1997c13c1
commit da16248e47
15 changed files with 39 additions and 110 deletions
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27
apps/plugins/plugin_crt0.c
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@ -63,10 +63,35 @@ enum plugin_status plugin__start(const void *param)
int exit_ret;
enum plugin_status ret;
/* zero out the bss section */
#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);
#ifdef HAVE_CPUCACHE_INVALIDATE
/* make the icache (if it exists) up to date with the new code */
rb->cpucache_invalidate();
#endif /* HAVE_CPUCACHE_INVALIDATE */
/* 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);
#endif
/* we come back here if exit() was called or the plugin returned normally */
exit_ret = setjmp(__exit_env);
if (exit_ret == 0)