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[v5,14/15] m68k: enable binfmt_flat on systems with an MMU

Message ID 1469374229-21585-15-git-send-email-nicolas.pitre@linaro.org
State Accepted
Commit 002d2f01f13f1671d771e1493a3405ed4986694d
Headers show

Commit Message

Nicolas Pitre July 24, 2016, 3:30 p.m. UTC 
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>

---
 arch/m68k/include/asm/flat.h | 5 +++--
 fs/Kconfig.binfmt            | 3 ++-
 2 files changed, 5 insertions(+), 3 deletions(-)

-- 
2.7.4
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Patch

diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index f46c2f044f..a97c479b11 100644
--- 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 72c03354c1..c7efddf6e0 100644
--- 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.