ARM: 8594/1: enable binfmt_flat on systems with an MMU

Now that the generic changes are in place, this can be enabled on ARM
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: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/flat.h b/arch/arm/include/asm/flat.h
index e847d23..acf1d14 100644 (file)
--- a/arch/arm/include/asm/flat.h
+++ b/arch/arm/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, persistent) ((void)persistent,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, persistent) \
+       ({ 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)
 #define        flat_set_persistent(relval, p)          0
 

diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index c7efddf..4c09d93 100644 (file)
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -89,7 +89,7 @@ config BINFMT_SCRIPT
 
 config BINFMT_FLAT
        bool "Kernel support for flat binaries"
-       depends on !MMU || M68K
+       depends on !MMU || ARM || M68K
        depends on !FRV || BROKEN
        help
          Support uClinux FLAT format binaries.