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| author | Ian Munsie <imunsie@au1.ibm.com> | 2013-09-23 04:05:11 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-10-11 07:48:56 +0200 |
| commit | d72b08017161ab385d4ae080ea415c9eb7ceef83 (patch) | |
| tree | c20ece2f9d78bf9e7d01824aec499713053c7120 /arch/powerpc/Makefile | |
| parent | KVM: PPC: Disable KVM on little endian builds (diff) | |
| download | linux-d72b08017161ab385d4ae080ea415c9eb7ceef83.tar.xz linux-d72b08017161ab385d4ae080ea415c9eb7ceef83.zip | |
powerpc: Add ability to build little endian kernels
This patch allows the kbuild system to successfully compile a kernel
for the little endian PowerPC64 architecture. A subsequent patch
will add the CONFIG_CPU_LITTLE_ENDIAN kernel config option which
must be set to build such a kernel.
If cross compiling, CROSS_COMPILE must point to a suitable toolchain
(compiled for the powerpc64le-linux and powerpcle-linux targets).
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Makefile')
| -rw-r--r-- | arch/powerpc/Makefile | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index debfa2b1c1de..d3c91bf923b7 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -65,11 +65,29 @@ endif UTS_MACHINE := $(OLDARCH) +ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y) +override CC += -mlittle-endian +override AS += -mlittle-endian +override LD += -EL +override CROSS32CC += -mlittle-endian +override CROSS32AS += -mlittle-endian +LDEMULATION := lppc +GNUTARGET := powerpcle +MULTIPLEWORD := -mno-multiple +else +override CC += -mbig-endian +override AS += -mbig-endian +override LD += -EB +LDEMULATION := ppc +GNUTARGET := powerpc +MULTIPLEWORD := -mmultiple +endif + ifeq ($(HAS_BIARCH),y) override AS += -a$(CONFIG_WORD_SIZE) -override LD += -m elf$(CONFIG_WORD_SIZE)ppc +override LD += -m elf$(CONFIG_WORD_SIZE)$(LDEMULATION) override CC += -m$(CONFIG_WORD_SIZE) -override AR := GNUTARGET=elf$(CONFIG_WORD_SIZE)-powerpc $(AR) +override AR := GNUTARGET=elf$(CONFIG_WORD_SIZE)-$(GNUTARGET) $(AR) endif LDFLAGS_vmlinux-y := -Bstatic @@ -95,7 +113,7 @@ endif CFLAGS-$(CONFIG_PPC64) := -mtraceback=no -mcall-aixdesc CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,-mminimal-toc) CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions) -CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple +CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD) ifeq ($(CONFIG_PPC_BOOK3S_64),y) CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4) |