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Commit 16c79651 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

Thumb-2: Add Thumb-2 support to the build files 



This patch adds the necessary entries to the Makefile and Kconfig
files for building the Thumb-2 kernel.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent e2ed3be7

arch/arm/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -983,6 +983,18 @@ config HZ 
	default AT91_TIMER_HZ if ARCH_AT91

	default 100



config THUMB2_KERNEL

	bool "Compile the kernel in Thumb-2 mode"

	depends on CPU_V7 && EXPERIMENTAL

	select AEABI

	select ARM_ASM_UNIFIED

	help

	  By enabling this option, the kernel will be compiled in

	  Thumb-2 mode. A compiler/assembler that understand the unified

	  ARM-Thumb syntax is needed.



	  If unsure, say N.



config ARM_ASM_UNIFIED

	bool

arch/arm/Kconfig.debug

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ source "lib/Kconfig.debug" 
# n, but then RMK will have to kill you ;).

config FRAME_POINTER

	bool

	depends on !THUMB2_KERNEL

	default y if !ARM_UNWIND

	help

	  If you say N here, the resulting kernel will be slightly smaller and

arch/arm/Makefile

+9 −2
Original line number Diff line number Diff line
@@ -93,9 +93,16 @@ ifeq ($(CONFIG_ARM_UNWIND),y) 
CFLAGS_ABI	+=-funwind-tables

endif



ifeq ($(CONFIG_THUMB2_KERNEL),y)

AFLAGS_AUTOIT	:=$(call as-option,-Wa$(comma)-mimplicit-it=thumb,-Wa$(comma)-mauto-it)

AFLAGS_NOWARN	:=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W)

CFLAGS_THUMB2	:=-mthumb $(AFLAGS_AUTOIT) $(AFLAGS_NOWARN)

AFLAGS_THUMB2	:=$(CFLAGS_THUMB2) -Wa$(comma)-mthumb

endif



# Need -Uarm for gcc < 3.x

KBUILD_CFLAGS	+=$(CFLAGS_ABI) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm

KBUILD_AFLAGS	+=$(CFLAGS_ABI) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float

KBUILD_CFLAGS	+=$(CFLAGS_ABI) $(CFLAGS_THUMB2) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm

KBUILD_AFLAGS	+=$(CFLAGS_ABI) $(AFLAGS_THUMB2) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float



CHECKFLAGS	+= -D__arm__