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

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

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2009-07-24 12:33:02 +01:00
parent e2ed3be731
commit 16c79651a5
3 changed files with 22 additions and 2 deletions
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12
arch/arm/Kconfig
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@ -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

1
arch/arm/Kconfig.debug
View file

@ -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

11
arch/arm/Makefile
View file

@ -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__