5ac47f7a6e
The ppc64 kernel can get loaded at any address which means our very early init code in prom_init.c must be relocatable. We do this with a pretty nasty RELOC() macro that we wrap accesses of variables with. It is very fragile and sometimes we forget to add a RELOC() to an uncommon path or sometimes a compiler change breaks it. 32bit has a much more elegant solution where we build prom_init.c with -mrelocatable and then process the relocations manually. Unfortunately we can't do the equivalent on 64bit and we would have to build the entire kernel relocatable (-pie), resulting in a large increase in kernel footprint (megabytes of relocation data). The relocation data will be marked __initdata but it still creates more pressure on our already tight memory layout at boot. Alan Modra pointed out that the 64bit ABI is relocatable even if we don't build with -pie, we just need to relocate the TOC. This patch implements that idea and relocates the TOC entries of prom_init.c. An added bonus is there are very few relocations to process which helps keep boot times on simulators down. gcc does not put 64bit integer constants into the TOC but to be safe we may want a build time script which passes through the prom_init.c TOC entries to make sure everything looks reasonable. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
259 lines
8.4 KiB
Makefile
259 lines
8.4 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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CROSS32AR := $(CROSS32_COMPILE)ar
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ifeq ($(HAS_BIARCH),y)
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ifeq ($(CROSS32_COMPILE),)
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CROSS32CC := $(CC) -m32
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CROSS32AR := GNUTARGET=elf32-powerpc $(AR)
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endif
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endif
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export CROSS32CC CROSS32AR
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ifeq ($(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 $(AR)
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endif
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LDFLAGS_vmlinux-y := -Bstatic
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LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
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LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
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CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=no -mcall-aixdesc
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CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple
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CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)
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CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
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CFLAGS-$(CONFIG_POWER4_CPU) += $(call cc-option,-mcpu=power4)
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CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
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CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
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CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
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CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)
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KBUILD_CPPFLAGS += -Iarch/$(ARCH)
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KBUILD_AFLAGS += -Iarch/$(ARCH)
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KBUILD_CFLAGS += -msoft-float -pipe -Iarch/$(ARCH) $(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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KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
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# No AltiVec or VSX instructions when building kernel
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KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
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KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
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# No SPE instruction when building kernel
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# (We use all available options to help semi-broken compilers)
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KBUILD_CFLAGS += $(call cc-option,-mno-spe)
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KBUILD_CFLAGS += $(call cc-option,-mspe=no)
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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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# FIXME: the module load should be taught about the additional relocs
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# generated by this.
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# revert to pre-gcc-4.4 behaviour of .eh_frame
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KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
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# Never use string load/store instructions as they are
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# often slow when they are implemented at all
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KBUILD_CFLAGS += -mno-string
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ifeq ($(CONFIG_6xx),y)
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KBUILD_CFLAGS += -mcpu=powerpc
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endif
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# Work around a gcc code-gen bug with -fno-omit-frame-pointer.
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ifeq ($(CONFIG_FUNCTION_TRACER),y)
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KBUILD_CFLAGS += -mno-sched-epilog
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endif
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cpu-as-$(CONFIG_4xx) += -Wa,-m405
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cpu-as-$(CONFIG_ALTIVEC) += -Wa,-maltivec
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cpu-as-$(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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head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
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head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.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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arch/powerpc/math-emu/ \
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arch/powerpc/crypto/ \
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arch/powerpc/net/
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core-$(CONFIG_XMON) += arch/powerpc/xmon/
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core-$(CONFIG_KVM) += arch/powerpc/kvm/
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core-$(CONFIG_PERF_EVENTS) += arch/powerpc/perf/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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# Default to zImage, override when needed
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all: zImage
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# With make 3.82 we cannot mix normal and wildcard targets
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BOOT_TARGETS1 := zImage zImage.initrd uImage
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BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
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PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
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boot := arch/$(ARCH)/boot
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ifeq ($(CONFIG_RELOCATABLE),y)
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quiet_cmd_relocs_check = CALL $<
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cmd_relocs_check = perl $< "$(OBJDUMP)" "$(obj)/vmlinux"
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PHONY += relocs_check
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relocs_check: arch/powerpc/relocs_check.pl vmlinux
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$(call cmd,relocs_check)
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zImage: relocs_check
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endif
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$(BOOT_TARGETS1): vmlinux
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$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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$(BOOT_TARGETS2): vmlinux
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$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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bootwrapper_install:
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$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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%.dtb: scripts
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$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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define archhelp
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@echo '* zImage - Build default images selected by kernel config'
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@echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
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@echo ' uImage - U-Boot native image format'
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@echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
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@echo ' versions which do not support device trees'
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@echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
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@echo ' simpleImage.<dt> - Firmware independent image.'
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@echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
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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/$(ARCH)/configs'
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@echo ''
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@echo ' Targets with <dt> embed a device tree blob inside the image'
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@echo ' These targets support board with firmware that does not'
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@echo ' support passing a device tree directly. Replace <dt> with the'
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@echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
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@echo ' (minus the .dts extension).'
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endef
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install:
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$(Q)$(MAKE) $(build)=$(boot) 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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# Check gcc and binutils versions:
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# - gcc-3.4 and binutils-2.14 are a fatal combination
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# - Require gcc 4.0 or above on 64-bit
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# - gcc-4.2.0 has issues compiling modules on 64-bit
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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 "$(call cc-version)" -lt "0400" \
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&& test "x${CONFIG_PPC64}" = "xy" ; then \
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echo -n "Sorry, GCC v4.0 or above is required to build " ; \
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echo "the 64-bit powerpc kernel." ; \
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false ; \
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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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CLEAN_FILES += $(TOUT)
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