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 <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index 2a16df3d931283f0f55ac4c95571dbe3629678c3..57fd286e4b0b410fe93cb0596c93488afa8b4b4e 100644 (file)
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -50,6 +50,7 @@
 #include <asm/pgtable.h>
 #include <asm/traps.h>
 #include <asm/ucontext.h>
 #include <asm/pgtable.h>
 #include <asm/traps.h>
 #include <asm/ucontext.h>

+#include <asm/cacheflush.h>

 
 #ifdef CONFIG_MMU
 
 
 #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));
                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);

        }
 }
 
        }
 }