0197cd2e35
Newer GCC's are capable of autovectorization for ISA extensions like AltiVec and SPE. If we happen to build with one of those compilers we will get SPE instructions in random kernel code. Today we only allow basic interger code in the kernel and FP, AltiVec, or SPE in special explicit locations that have handled the proper saving and restoring of the register state (since on uniprocessor we lazy context switch the register state for FP, AltiVec, and SPE). -mno-spe disables the compiler for automatically generating SPE instructions without our knowledge. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
225 lines
6.6 KiB
Makefile
225 lines
6.6 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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# Changes for PPC by Gary Thomas
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# Rewritten by Cort Dougan and Paul Mackerras
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#
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HAS_BIARCH := $(call cc-option-yn, -m32)
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# Set default 32 bits cross compilers for vdso and boot wrapper
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CROSS32_COMPILE ?=
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CROSS32CC := $(CROSS32_COMPILE)gcc
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CROSS32AS := $(CROSS32_COMPILE)as
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CROSS32LD := $(CROSS32_COMPILE)ld
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CROSS32AR := $(CROSS32_COMPILE)ar
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CROSS32OBJCOPY := $(CROSS32_COMPILE)objcopy
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ifeq ($(HAS_BIARCH),y)
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ifeq ($(CROSS32_COMPILE),)
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CROSS32CC := $(CC) -m32
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CROSS32AS := $(AS) -a32
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CROSS32LD := $(LD) -m elf32ppc
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CROSS32OBJCOPY := $(OBJCOPY)
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CROSS32AR := GNUTARGET=elf32-powerpc $(AR)
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endif
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endif
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export CROSS32CC CROSS32AS CROSS32LD CROSS32AR CROSS32OBJCOPY
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ifeq ($(CROSS_COMPILE),)
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KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
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else
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KBUILD_DEFCONFIG := ppc64_defconfig
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endif
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ifeq ($(CONFIG_PPC64),y)
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OLDARCH := ppc64
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new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
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ifeq ($(new_nm),y)
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NM := $(NM) --synthetic
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endif
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else
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OLDARCH := ppc
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endif
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# It seems there are times we use this Makefile without
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# including the config file, but this replicates the old behaviour
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ifeq ($(CONFIG_WORD_SIZE),)
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CONFIG_WORD_SIZE := 32
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endif
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UTS_MACHINE := $(OLDARCH)
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ifeq ($(HAS_BIARCH),y)
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override AS += -a$(CONFIG_WORD_SIZE)
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override LD += -m elf$(CONFIG_WORD_SIZE)ppc
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override CC += -m$(CONFIG_WORD_SIZE)
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override AR := GNUTARGET=elf$(CONFIG_WORD_SIZE)-powerpc $(AR)
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endif
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LDFLAGS_vmlinux := -Bstatic
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CPPFLAGS-$(CONFIG_PPC32) := -Iarch/$(ARCH)
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AFLAGS-$(CONFIG_PPC32) := -Iarch/$(ARCH)
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CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=none -mcall-aixdesc
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CFLAGS-$(CONFIG_PPC32) := -Iarch/$(ARCH) -ffixed-r2 -mmultiple
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KBUILD_CPPFLAGS += $(CPPFLAGS-y)
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KBUILD_AFLAGS += $(AFLAGS-y)
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KBUILD_CFLAGS += -msoft-float -pipe $(CFLAGS-y)
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CPP = $(CC) -E $(KBUILD_CFLAGS)
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CHECKFLAGS += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__
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ifeq ($(CONFIG_PPC64),y)
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GCC_BROKEN_VEC := $(shell if [ $(call cc-version) -lt 0400 ] ; then echo "y"; fi)
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ifeq ($(CONFIG_POWER4_ONLY),y)
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ifeq ($(CONFIG_ALTIVEC),y)
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ifeq ($(GCC_BROKEN_VEC),y)
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KBUILD_CFLAGS += $(call cc-option,-mcpu=970)
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else
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KBUILD_CFLAGS += $(call cc-option,-mcpu=power4)
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endif
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else
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KBUILD_CFLAGS += $(call cc-option,-mcpu=power4)
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endif
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else
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KBUILD_CFLAGS += $(call cc-option,-mtune=power4)
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endif
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endif
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ifeq ($(CONFIG_TUNE_CELL),y)
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KBUILD_CFLAGS += $(call cc-option,-mtune=cell)
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endif
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# No AltiVec instruction when building kernel
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KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
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# No SPE instruction when building kernel
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KBUILD_CFLAGS += $(call cc-option,-mno-spe)
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# Enable unit-at-a-time mode when possible. It shrinks the
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# kernel considerably.
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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# Never use string load/store instructions as they are
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# often slow when they are implemented at all
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KBUILD_CFLAGS += -mno-string
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ifeq ($(CONFIG_6xx),y)
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KBUILD_CFLAGS += -mcpu=powerpc
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endif
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cpu-as-$(CONFIG_4xx) += -Wa,-m405
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cpu-as-$(CONFIG_6xx) += -Wa,-maltivec
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cpu-as-$(CONFIG_POWER4) += -Wa,-maltivec
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cpu-as-$(CONFIG_E500) += -Wa,-me500
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cpu-as-$(CONFIG_E200) += -Wa,-me200
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KBUILD_AFLAGS += $(cpu-as-y)
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KBUILD_CFLAGS += $(cpu-as-y)
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head-y := arch/powerpc/kernel/head_$(CONFIG_WORD_SIZE).o
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head-$(CONFIG_8xx) := arch/powerpc/kernel/head_8xx.o
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head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
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head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
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head-$(CONFIG_FSL_BOOKE) := arch/powerpc/kernel/head_fsl_booke.o
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head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
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head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
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core-y += arch/powerpc/kernel/ \
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arch/powerpc/mm/ \
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arch/powerpc/lib/ \
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arch/powerpc/sysdev/ \
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arch/powerpc/platforms/
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core-$(CONFIG_MATH_EMULATION) += arch/powerpc/math-emu/
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core-$(CONFIG_XMON) += arch/powerpc/xmon/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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# Default to zImage, override when needed
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defaultimage-y := zImage
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defaultimage-$(CONFIG_DEFAULT_UIMAGE) := uImage
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KBUILD_IMAGE := $(defaultimage-y)
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all: $(KBUILD_IMAGE)
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CPPFLAGS_vmlinux.lds := -Upowerpc
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BOOT_TARGETS = zImage zImage.initrd uImage
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PHONY += $(BOOT_TARGETS)
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boot := arch/$(ARCH)/boot
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$(BOOT_TARGETS): vmlinux
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$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
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@echo ' install - Install kernel using'
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@echo ' (your) ~/bin/installkernel or'
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@echo ' (distribution) /sbin/installkernel or'
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@echo ' install to $$(INSTALL_PATH) and run lilo'
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@echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
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endef
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install: vdso_install
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) install
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vdso_install:
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ifeq ($(CONFIG_PPC64),y)
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$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
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endif
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$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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archprepare: checkbin
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# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
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# to stdout and these checks are run even on install targets.
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TOUT := .tmp_gas_check
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# Ensure this is binutils 2.12.1 (or 2.12.90.0.7) or later for altivec
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# instructions.
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# gcc-3.4 and binutils-2.14 are a fatal combination.
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checkbin:
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@if test "$(call cc-version)" = "0304" ; then \
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if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
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echo 'correctly with gcc-3.4 and your version of binutils.'; \
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echo '*** Please upgrade your binutils or downgrade your gcc'; \
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false; \
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fi ; \
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fi
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@if test "$(call cc-fullversion)" = "040200" \
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&& test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \
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echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
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echo 'kernel with modules enabled.' ; \
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echo -n '*** Please use a different GCC version or ' ; \
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echo 'disable kernel modules' ; \
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false ; \
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fi
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@if ! /bin/echo dssall | $(AS) -many -o $(TOUT) >/dev/null 2>&1 ; then \
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echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build ' ; \
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echo 'correctly with old versions of binutils.' ; \
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echo '*** Please upgrade your binutils to 2.12.1 or newer' ; \
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false ; \
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fi
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CLEAN_FILES += $(TOUT)
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