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52292c9b8c
gcc-4.0 generates altivec code implicitly when -mcpu indicates an altivec capable CPU which is not suitable for the kernel. However, we used to set -mcpu=970 when CONFIG_ALTIVEC was set because a gcc-3.x bug prevented from using -maltivec along with -mcpu=power4, thus prevented building the RAID6 altivec code. This patch fixes all of this by testing for the gcc version. If 4.0 or later, just normally use -mcpu=power4 and let the RAID6 code add -maltivec to the few files it needs to be compiled with altivec support. For 3.x, we still use -mcpu=970 to work around the above problem, which is fine as 3.x will never implicitly generate altivec code. The Makefile hackery may not be the most lovely, I welcome anybody more skilled than me to improve it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
129 lines
3.8 KiB
Makefile
129 lines
3.8 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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# Adjusted for PPC64 by Tom Gall
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#
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KERNELLOAD := 0xc000000000000000
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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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CROSS32OBJCOPY := $(CROSS32_COMPILE)objcopy
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# If we have a biarch compiler, use it for 32 bits cross compile if
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# CROSS32_COMPILE wasn't explicitely defined, and add proper explicit
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# target type to target compilers
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HAS_BIARCH := $(call cc-option-yn, -m64)
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ifeq ($(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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endif
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AS := $(AS) -a64
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LD := $(LD) -m elf64ppc
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CC := $(CC) -m64
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endif
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export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY
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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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CHECKFLAGS += -m64 -D__powerpc__
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LDFLAGS := -m elf64ppc
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LDFLAGS_vmlinux := -Bstatic -e $(KERNELLOAD) -Ttext $(KERNELLOAD)
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CFLAGS += -msoft-float -pipe -mminimal-toc -mtraceback=none \
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-mcall-aixdesc
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GCC_VERSION := $(call cc-version)
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GCC_BROKEN_VEC := $(shell if [ $(GCC_VERSION) -lt 0400 ] ; then echo "y"; fi ;)
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ifeq ($(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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CFLAGS += $(call cc-option,-mcpu=970)
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else
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CFLAGS += $(call cc-option,-mcpu=power4)
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endif
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else
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CFLAGS += $(call cc-option,-mcpu=power4)
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endif
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else
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CFLAGS += $(call cc-option,-mtune=power4)
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endif
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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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CFLAGS += $(call cc-option,-funit-at-a-time)
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head-y := arch/ppc64/kernel/head.o
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libs-y += arch/ppc64/lib/
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core-y += arch/ppc64/kernel/
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core-y += arch/ppc64/mm/
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core-$(CONFIG_XMON) += arch/ppc64/xmon/
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drivers-$(CONFIG_OPROFILE) += arch/ppc64/oprofile/
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boot := arch/ppc64/boot
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boottarget-$(CONFIG_PPC_PSERIES) := zImage zImage.initrd
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boottarget-$(CONFIG_PPC_MAPLE) := zImage zImage.initrd
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boottarget-$(CONFIG_PPC_ISERIES) := vmlinux.sminitrd vmlinux.initrd vmlinux.sm
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$(boottarget-y): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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bootimage-$(CONFIG_PPC_PSERIES) := $(boot)/zImage
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bootimage-$(CONFIG_PPC_PMAC) := vmlinux
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bootimage-$(CONFIG_PPC_MAPLE) := $(boot)/zImage
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bootimage-$(CONFIG_PPC_ISERIES) := vmlinux
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BOOTIMAGE := $(bootimage-y)
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install: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
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defaultimage-$(CONFIG_PPC_PSERIES) := zImage
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defaultimage-$(CONFIG_PPC_PMAC) := vmlinux
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defaultimage-$(CONFIG_PPC_MAPLE) := zImage
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defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux
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KBUILD_IMAGE := $(defaultimage-y)
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all: $(KBUILD_IMAGE)
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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prepare: include/asm-ppc64/offsets.h
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arch/ppc64/kernel/asm-offsets.s: include/asm include/linux/version.h \
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include/config/MARKER
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include/asm-ppc64/offsets.h: arch/ppc64/kernel/asm-offsets.s
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$(call filechk,gen-asm-offsets)
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define archhelp
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echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
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echo ' zImage.initrd- Compressed kernel image with initrd attached,'
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echo ' sourced from arch/$(ARCH)/boot/ramdisk.image.gz'
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echo ' (arch/$(ARCH)/boot/zImage.initrd)'
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endef
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CLEAN_FILES += include/asm-ppc64/offsets.h
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