Invalidate the CPU cache after clearing bss, to make sure that bss variables that are used via non-cached aliases don't read garbage.

This fixes FS#11653 for me


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28236 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 8 insertions, 0 deletions

diff --git a/apps/codecs/codec_crt0.c b/apps/codecs/codec_crt0.c
index 184da74c8f..cf14e460ec 100644
--- a/apps/codecs/codec_crt0.c
+++ b/apps/codecs/codec_crt0.c
@@ -53,6 +53,10 @@ enum codec_status codec_start(void)
     }
 #endif /* PLUGIN_USE_IRAM */
     ci->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 */
+    ci->cpucache_invalidate();
 #endif
 
     return codec_main();
diff --git a/apps/plugins/plugin_crt0.c b/apps/plugins/plugin_crt0.c
index 1db9d6a81a..d86c5c367c 100644
--- a/apps/plugins/plugin_crt0.c
+++ b/apps/plugins/plugin_crt0.c
@@ -90,6 +90,10 @@ enum plugin_status plugin__start(const void *param)
 
     /* 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->cpucache_invalidate();
 #endif
 
     /* we come back here if exit() was called or the plugin returned normally */