Add core support for ARMv6/v7 big-endian

Starting with ARMv6, the CPUs support the BE-8 variant of big-endian
(byte-invariant). This patch adds the core support:

- setting of the BE-8 mode via the CPSR.E register for both kernel and
  user threads
- big-endian page table walking
- REV used to rotate instructions read from memory during fault
  processing as they are still little-endian format
- Kconfig and Makefile support for BE-8. The --be8 option must be passed
  to the final linking stage to convert the instructions to
  little-endian

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index e84729bf13d4..1167a4e8c7a8 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -11,6 +11,9 @@
 # Copyright (C) 1995-2001 by Russell King
 
 LDFLAGS_vmlinux :=-p --no-undefined -X
+ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
+LDFLAGS_vmlinux += --be8
+endif
 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
 OBJCOPYFLAGS    :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
 GZFLAGS         :=-9