m68k: enable binfmt_flat on systems with an MMU

Now that the generic changes are in place, this can be enabled on m68k
with the use of proper user space accessors in the flat_get_addr_from_rp()
and flat_put_addr_at_rp() handlers as rp actually holds a user space
address.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>

diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index 8e58d47..00c392b 100644 (file)
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -8,8 +8,9 @@
 #define        flat_argvp_envp_on_stack()              1
 #define        flat_old_ram_flag(flags)                (flags)
 #define        flat_reloc_valid(reloc, size)           ((reloc) <= (size))
-#define        flat_get_addr_from_rp(rp, relval, flags, p)     get_unaligned(rp)
-#define        flat_put_addr_at_rp(rp, val, relval)    put_unaligned(val,rp)
+#define        flat_get_addr_from_rp(rp, relval, flags, p) \
+       ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
+#define        flat_put_addr_at_rp(rp, val, relval)    __put_user_unaligned(val, rp)
 #define        flat_get_relocate_addr(rel)             (rel)
 
 static inline int flat_set_persistent(unsigned long relval,

diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 72c0335..c7efddf 100644 (file)
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -89,7 +89,8 @@ config BINFMT_SCRIPT
 
 config BINFMT_FLAT
        bool "Kernel support for flat binaries"
-       depends on !MMU && (!FRV || BROKEN)
+       depends on !MMU || M68K
+       depends on !FRV || BROKEN
        help
          Support uClinux FLAT format binaries.