From 42cb38bcb7a2a8f3a12bf4721e708476daf4f190 Mon Sep 17 00:00:00 2001 From: Alexander Stein Date: Wed, 5 Jun 2013 13:42:39 +0200 Subject: [PATCH] m68k/coldfire: flush cache when creating the signal stack frame When the signal stack frame is created, it must be flushed in order to make sure the cache fetches the correct data. Without cache flush the icache might pick up old cached data from an older signal stack frame if the signal is raised again very fast. In case of copyback the data cache muist be pushed first, but is untested. Signed-off-by: Alexander Stein Signed-off-by: Greg Ungerer --- arch/m68k/kernel/signal.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index 2a16df3d9312..57fd286e4b0b 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -50,6 +50,7 @@ #include #include #include +#include #ifdef CONFIG_MMU @@ -181,6 +182,13 @@ static inline void push_cache (unsigned long vaddr) asm volatile ("movec %0,%%caar\n\t" "movec %1,%%cacr" : : "r" (vaddr + 4), "r" (temp)); + } else { + /* CPU_IS_COLDFIRE */ +#if defined(CONFIG_CACHE_COPYBACK) + flush_cf_dcache(0, DCACHE_MAX_ADDR); +#endif + /* Invalidate instruction cache for the pushed bytes */ + clear_cf_icache(vaddr, vaddr + 8); } } -- 2.20.1