e19e4ab415
Currently we set the kernel entry point and the address of the text section in the Makefile, using CONFIG_KERNEL_START. But we've already got <asm/page.h> in the linker script, so we can just use KERNELBASE directly. That means if we ever change KERNELBASE there's one less place to change it. And we can set the entry point with ENTRY(). There are zero differences from "readelf -a vmlinux" with or without this patch. Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
220 lines
6.5 KiB
Makefile
220 lines
6.5 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 := $(call cc-option-yn, -m32)
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ifeq ($(CONFIG_PPC64),y)
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OLDARCH := ppc64
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SZ := 64
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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 := $(CROSS32_COMPILE)objcopy
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ifeq ($(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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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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else
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OLDARCH := ppc
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SZ := 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$(SZ)
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override LD += -m elf$(SZ)ppc
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override CC += -m$(SZ)
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endif
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LDFLAGS_vmlinux := -Bstatic
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# The -Iarch/$(ARCH)/include is temporary while we are merging
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CPPFLAGS += -Iarch/$(ARCH) -Iarch/$(ARCH)/include
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AFLAGS += -Iarch/$(ARCH)
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CFLAGS += -Iarch/$(ARCH) -msoft-float -pipe
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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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CFLAGS += $(CFLAGS-y)
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CPP = $(CC) -E $(CFLAGS)
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# Temporary hack until we have migrated to asm-powerpc
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LINUXINCLUDE += -Iarch/$(ARCH)/include
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CHECKFLAGS += -m$(SZ) -D__powerpc__ -D__powerpc$(SZ)__
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ifeq ($(CONFIG_PPC64),y)
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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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endif
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# No AltiVec instruction when building kernel
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CFLAGS += $(call cc-option,-mno-altivec)
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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 += $(call cc-option,-funit-at-a-time)
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ifndef CONFIG_FSL_BOOKE
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CFLAGS += -mstring
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endif
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cpu-as-$(CONFIG_PPC64BRIDGE) += -Wa,-mppc64bridge
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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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AFLAGS += $(cpu-as-y)
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CFLAGS += $(cpu-as-y)
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# Default to the common case.
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KBUILD_DEFCONFIG := common_defconfig
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head-y := arch/powerpc/kernel/head_32.o
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head-$(CONFIG_PPC64) := arch/powerpc/kernel/head_64.o
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head-$(CONFIG_8xx) := arch/powerpc/kernel/head_8xx.o
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head-$(CONFIG_4xx) := arch/powerpc/kernel/head_4xx.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/$(OLDARCH)/kernel/ \
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arch/powerpc/mm/ \
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arch/powerpc/lib/ \
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arch/powerpc/sysdev/ \
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arch/powerpc/platforms/
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core-$(CONFIG_MATH_EMULATION) += arch/ppc/math-emu/
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core-$(CONFIG_XMON) += arch/powerpc/xmon/
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core-$(CONFIG_APUS) += arch/ppc/amiga/
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drivers-$(CONFIG_8xx) += arch/ppc/8xx_io/
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drivers-$(CONFIG_4xx) += arch/ppc/4xx_io/
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drivers-$(CONFIG_CPM2) += arch/ppc/8260_io/
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drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/
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defaultimage-$(CONFIG_PPC32) := uImage zImage
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defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux
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defaultimage-$(CONFIG_PPC_PSERIES) := zImage
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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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# All the instructions talk about "make bzImage".
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bzImage: zImage
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BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
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.PHONY: $(BOOT_TARGETS)
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boot := arch/$(OLDARCH)/boot
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# urk
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ifeq ($(CONFIG_PPC64),y)
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$(BOOT_TARGETS): vmlinux
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$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
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else
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$(BOOT_TARGETS): vmlinux
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$(Q)$(MAKE) ARCH=ppc $(build)=$(boot) $@
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endif
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uImage: vmlinux
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$(Q)$(MAKE) ARCH=$(OLDARCH) $(build)=$(boot)/images $(boot)/images/$@
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/$(ARCH)/boot/images/zImage.*)'
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@echo ' uImage - Create a bootable image for U-Boot / PPCBoot'
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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/$(ARCH)/ppc/configs'
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endef
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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# Temporary hack until we have migrated to asm-powerpc
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$(Q)rm -rf arch/$(ARCH)/include
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archprepare: checkbin
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# Temporary hack until we have migrated to asm-powerpc
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include/asm: arch/$(ARCH)/include/asm
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arch/$(ARCH)/include/asm:
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$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
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$(Q)ln -fsn $(srctree)/include/asm-$(OLDARCH) arch/$(ARCH)/include/asm
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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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GCC_VERSION := $(call cc-version)
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checkbin:
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@if test "$(GCC_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 ! /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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