ARM: armv7: Add C wrapper for allow_unaligned()
Rename current assembler implementation of allow_unaligned() to
v7_arch_cp15_allow_unaligned() and add it into armv7.h header,
then add C wrapper of allow_unaligned().
This fixes misbehavior when linking U-Boot on ARMv7a i.MX6Q, where the
CPU specific allow_unaligned() implementation was ignored and instead the
__weak allow_unaligned() implementation from lib/efi_loader/efi_setup.c
was used, which led to "data abort" just before booting Linux via tftp,
in efi_dp_from_file() -> path_to_uefi() -> utf16_put() .
The problem is triggerd by c7c0ca37673 ("efi_loader: fix efi_dp_from_file()") .
Adding the wrapper fixes the problem.
Fixes: 78f90aaeecc ("arm: armv7: allow unaligned memory access")
Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/arch/arm/cpu/armv7/sctlr.S b/arch/arm/cpu/armv7/sctlr.S
index bd56e41..d44b214 100644
--- a/arch/arm/cpu/armv7/sctlr.S
+++ b/arch/arm/cpu/armv7/sctlr.S
@@ -8,15 +8,15 @@
#include <linux/linkage.h>
/*
- * void allow_unaligned(void) - allow unaligned access
+ * void v7_arch_cp15_allow_unaligned(void) - allow unaligned access
*
* This routine clears the aligned flag in the system control register.
* After calling this routine unaligned access does no longer lead to a
* data abort but is handled by the CPU.
*/
-ENTRY(allow_unaligned)
+ENTRY(v7_arch_cp15_allow_unaligned)
mrc p15, 0, r0, c1, c0, 0 @ load system control register
bic r0, r0, #2 @ clear aligned flag
mcr p15, 0, r0, c1, c0, 0 @ write system control register
bx lr @ return
-ENDPROC(allow_unaligned)
+ENDPROC(v7_arch_cp15_allow_unaligned)