549e8152de
This implements CONFIG_RELOCATABLE for 64-bit by making the kernel as a position-independent executable (PIE) when it is set. This involves processing the dynamic relocations in the image in the early stages of booting, even if the kernel is being run at the address it is linked at, since the linker does not necessarily fill in words in the image for which there are dynamic relocations. (In fact the linker does fill in such words for 64-bit executables, though not for 32-bit executables, so in principle we could avoid calling relocate() entirely when we're running a 64-bit kernel at the linked address.) The dynamic relocations are processed by a new function relocate(addr), where the addr parameter is the virtual address where the image will be run. In fact we call it twice; once before calling prom_init, and again when starting the main kernel. This means that reloc_offset() returns 0 in prom_init (since it has been relocated to the address it is running at), which necessitated a few adjustments. This also changes __va and __pa to use an equivalent definition that is simpler. With the relocatable kernel, PAGE_OFFSET and MEMORY_START are constants (for 64-bit) whereas PHYSICAL_START is a variable (and KERNELBASE ideally should be too, but isn't yet). With this, relocatable kernels still copy themselves down to physical address 0 and run there. Signed-off-by: Paul Mackerras <paulus@samba.org>
241 lines
7.5 KiB
Makefile
241 lines
7.5 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 $(AR)
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endif
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LDFLAGS_vmlinux-yy := -Bstatic
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LDFLAGS_vmlinux-$(CONFIG_PPC64)$(CONFIG_RELOCATABLE) := -pie
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LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-yy)
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CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=none -mcall-aixdesc
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CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple
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KBUILD_CPPFLAGS += -Iarch/$(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$(CONFIG_WORD_SIZE)__
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ifeq ($(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 += $(call cc-option,-mtune=power4)
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endif
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else
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LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
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endif
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ifeq ($(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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# Work around a gcc code-gen bug with -fno-omit-frame-pointer.
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ifeq ($(CONFIG_FTRACE),y)
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KBUILD_CFLAGS += -mno-sched-epilog
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endif
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cpu-as-$(CONFIG_4xx) += -Wa,-m405
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cpu-as-$(CONFIG_6xx) += -Wa,-maltivec
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cpu-as-$(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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core-$(CONFIG_KVM) += arch/powerpc/kvm/
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drivers-$(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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CPPFLAGS_vmlinux.lds := -Upowerpc
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BOOT_TARGETS = zImage zImage.initrd uImage zImage% dtbImage% treeImage.% cuImage.% simpleImage.%
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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)/%,$@)
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bootwrapper_install %.dtb:
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$(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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# 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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