OSCL-LXR

0001 # This file is included by the global makefile so that you can add your own
0002 # architecture-specific flags and dependencies.
0003 #
0004 # This file is subject to the terms and conditions of the GNU General Public
0005 # License.  See the file "COPYING" in the main directory of this archive
0006 # for more details.
0007 #
0008 # Copyright (C) 1994 by Linus Torvalds
0009 # Changes for PPC by Gary Thomas
0010 # Rewritten by Cort Dougan and Paul Mackerras
0011 #
0012
0013 HAS_BIARCH      := $(call cc-option-yn, -m32)
0014
0015 # Set default 32 bits cross compilers for vdso and boot wrapper
0016 CROSS32_COMPILE ?=
0017
0018 # If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
0019 # ppc64_defconfig because we have nothing better to go on.
0020 uname := $(shell uname -m)
0021 KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
0022
0023 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
0024
0025 ifeq ($(new_nm),y)
0026 NM              := $(NM) --synthetic
0027 endif
0028
0029 # BITS is used as extension for files which are available in a 32 bit
0030 # and a 64 bit version to simplify shared Makefiles.
0031 # e.g.: obj-y += foo_$(BITS).o
0032 export BITS
0033
0034 ifdef CONFIG_PPC64
0035         BITS := 64
0036 else
0037         BITS := 32
0038 endif
0039
0040 machine-y = ppc
0041 machine-$(CONFIG_PPC64) += 64
0042 machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
0043 UTS_MACHINE := $(subst $(space),,$(machine-y))
0044
0045 # XXX This needs to be before we override LD below
0046 ifdef CONFIG_PPC32
0047 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
0048 else
0049 ifeq ($(call ld-ifversion, -ge, 22500, y),y)
0050 # Have the linker provide sfpr if possible.
0051 # There is a corresponding test in arch/powerpc/lib/Makefile
0052 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
0053 else
0054 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
0055 endif
0056 endif
0057
0058 ifdef CONFIG_CPU_LITTLE_ENDIAN
0059 KBUILD_CFLAGS   += -mlittle-endian
0060 KBUILD_LDFLAGS  += -EL
0061 LDEMULATION     := lppc
0062 GNUTARGET       := powerpcle
0063 MULTIPLEWORD    := -mno-multiple
0064 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
0065 else
0066 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
0067 KBUILD_LDFLAGS  += -EB
0068 LDEMULATION     := ppc
0069 GNUTARGET       := powerpc
0070 MULTIPLEWORD    := -mmultiple
0071 endif
0072
0073 ifdef CONFIG_PPC64
0074 ifndef CONFIG_CC_IS_CLANG
0075 cflags-$(CONFIG_PPC64_ELF_ABI_V1)       += $(call cc-option,-mabi=elfv1)
0076 cflags-$(CONFIG_PPC64_ELF_ABI_V1)       += $(call cc-option,-mcall-aixdesc)
0077 aflags-$(CONFIG_PPC64_ELF_ABI_V1)       += $(call cc-option,-mabi=elfv1)
0078 aflags-$(CONFIG_PPC64_ELF_ABI_V2)       += -mabi=elfv2
0079 endif
0080 endif
0081
0082 ifndef CONFIG_CC_IS_CLANG
0083   cflags-$(CONFIG_CPU_LITTLE_ENDIAN)    += -mno-strict-align
0084 endif
0085
0086 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mbig-endian)
0087 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -mlittle-endian
0088 aflags-$(CONFIG_CPU_BIG_ENDIAN)         += $(call cc-option,-mbig-endian)
0089 aflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -mlittle-endian
0090
0091 ifeq ($(HAS_BIARCH),y)
0092 KBUILD_CFLAGS   += -m$(BITS)
0093 KBUILD_AFLAGS   += -m$(BITS) -Wl,-a$(BITS)
0094 KBUILD_LDFLAGS  += -m elf$(BITS)$(LDEMULATION)
0095 endif
0096
0097 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
0098 ifdef CONFIG_PPC64
0099 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
0100 else
0101 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
0102 endif
0103
0104 LDFLAGS_vmlinux-y := -Bstatic
0105 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
0106 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
0107 LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
0108
0109 ifdef CONFIG_PPC64
0110 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
0111         # -mcmodel=medium breaks modules because it uses 32bit offsets from
0112         # the TOC pointer to create pointers where possible. Pointers into the
0113         # percpu data area are created by this method.
0114         #
0115         # The kernel module loader relocates the percpu data section from the
0116         # original location (starting with 0xd...) to somewhere in the base
0117         # kernel percpu data space (starting with 0xc...). We need a full
0118         # 64bit relocation for this to work, hence -mcmodel=large.
0119         KBUILD_CFLAGS_MODULE += -mcmodel=large
0120 else
0121         export NO_MINIMAL_TOC := -mno-minimal-toc
0122 endif
0123 endif
0124
0125 CFLAGS-$(CONFIG_PPC64)  := $(call cc-option,-mtraceback=no)
0126 ifndef CONFIG_CC_IS_CLANG
0127 ifdef CONFIG_PPC64_ELF_ABI_V2
0128 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
0129 AFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv2)
0130 else
0131 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv1)
0132 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mcall-aixdesc)
0133 AFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mabi=elfv1)
0134 endif
0135 endif
0136 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
0137 CFLAGS-$(CONFIG_PPC64)  += $(call cc-option,-mno-pointers-to-nested-functions)
0138
0139 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
0140 # https://bugs.llvm.org/show_bug.cgi?id=39555
0141 CFLAGS-$(CONFIG_PPC32)  := $(call cc-option, -ffixed-r2)
0142
0143 # Clang doesn't support -mmultiple / -mno-multiple
0144 # https://bugs.llvm.org/show_bug.cgi?id=39556
0145 CFLAGS-$(CONFIG_PPC32)  += $(call cc-option, $(MULTIPLEWORD))
0146
0147 CFLAGS-$(CONFIG_PPC32)  += $(call cc-option,-mno-readonly-in-sdata)
0148
0149 ifdef CONFIG_PPC_BOOK3S_64
0150 ifdef CONFIG_CPU_LITTLE_ENDIAN
0151 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
0152 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
0153 else
0154 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
0155 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
0156 endif
0157 else ifdef CONFIG_PPC_BOOK3E_64
0158 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
0159 endif
0160
0161 ifdef CONFIG_FUNCTION_TRACER
0162 CC_FLAGS_FTRACE := -pg
0163 ifdef CONFIG_MPROFILE_KERNEL
0164 CC_FLAGS_FTRACE += -mprofile-kernel
0165 endif
0166 endif
0167
0168 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
0169 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
0170
0171 CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
0172 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
0173
0174 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
0175
0176 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
0177 KBUILD_AFLAGS   += $(AFLAGS-y)
0178 KBUILD_CFLAGS   += $(call cc-option,-msoft-float)
0179 KBUILD_CFLAGS   += -pipe $(CFLAGS-y)
0180 CPP             = $(CC) -E $(KBUILD_CFLAGS)
0181
0182 CHECKFLAGS      += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
0183 ifdef CONFIG_CPU_BIG_ENDIAN
0184 CHECKFLAGS      += -D__BIG_ENDIAN__
0185 else
0186 CHECKFLAGS      += -D__LITTLE_ENDIAN__
0187 endif
0188
0189 ifdef CONFIG_476FPE_ERR46
0190         KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
0191                 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
0192 endif
0193
0194 # No AltiVec or VSX instructions when building kernel
0195 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
0196 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
0197
0198 # No SPE instruction when building kernel
0199 # (We use all available options to help semi-broken compilers)
0200 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
0201 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
0202
0203 # Don't emit .eh_frame since we have no use for it
0204 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
0205
0206 # Never use string load/store instructions as they are
0207 # often slow when they are implemented at all
0208 KBUILD_CFLAGS           += $(call cc-option,-mno-string)
0209
0210 cpu-as-$(CONFIG_40x)            += -Wa,-m405
0211 cpu-as-$(CONFIG_44x)            += -Wa,-m440
0212 cpu-as-$(CONFIG_ALTIVEC)        += $(call as-option,-Wa$(comma)-maltivec)
0213 cpu-as-$(CONFIG_E500)           += -Wa,-me500
0214
0215 # When using '-many -mpower4' gas will first try and find a matching power4
0216 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
0217 # about. GCC will pass -many to GAS when assembling, clang does not.
0218 # LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
0219 # but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
0220 cpu-as-$(CONFIG_PPC_BOOK3S_64)  += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
0221 cpu-as-$(CONFIG_PPC_E500MC)     += $(call as-option,-Wa$(comma)-me500mc)
0222
0223 KBUILD_AFLAGS += $(cpu-as-y)
0224 KBUILD_CFLAGS += $(cpu-as-y)
0225
0226 KBUILD_AFLAGS += $(aflags-y)
0227 KBUILD_CFLAGS += $(cflags-y)
0228
0229 head-$(CONFIG_PPC64)            := arch/powerpc/kernel/head_64.o
0230 head-$(CONFIG_PPC_BOOK3S_32)    := arch/powerpc/kernel/head_book3s_32.o
0231 head-$(CONFIG_PPC_8xx)          := arch/powerpc/kernel/head_8xx.o
0232 head-$(CONFIG_40x)              := arch/powerpc/kernel/head_40x.o
0233 head-$(CONFIG_44x)              := arch/powerpc/kernel/head_44x.o
0234 head-$(CONFIG_FSL_BOOKE)        := arch/powerpc/kernel/head_fsl_booke.o
0235
0236 head-$(CONFIG_PPC64)            += arch/powerpc/kernel/entry_64.o
0237 head-$(CONFIG_PPC_FPU)          += arch/powerpc/kernel/fpu.o
0238 head-$(CONFIG_ALTIVEC)          += arch/powerpc/kernel/vector.o
0239 head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE)  += arch/powerpc/kernel/prom_init.o
0240
0241 # Default to zImage, override when needed
0242 all: zImage
0243
0244 # With make 3.82 we cannot mix normal and wildcard targets
0245 BOOT_TARGETS1 := zImage zImage.initrd uImage
0246 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
0247
0248 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
0249
0250 boot := arch/$(ARCH)/boot
0251
0252 $(BOOT_TARGETS1): vmlinux
0253         $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
0254 $(BOOT_TARGETS2): vmlinux
0255         $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
0256
0257
0258 PHONY += bootwrapper_install
0259 bootwrapper_install:
0260         $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
0261
0262 # Used to create 'merged defconfigs'
0263 # To use it $(call) it with the first argument as the base defconfig
0264 # and the second argument as a space separated list of .config files to merge,
0265 # without the .config suffix.
0266 define merge_into_defconfig
0267         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
0268                 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
0269                 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
0270         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
0271 endef
0272
0273 PHONY += pseries_le_defconfig
0274 pseries_le_defconfig:
0275         $(call merge_into_defconfig,pseries_defconfig,le)
0276
0277 PHONY += ppc64le_defconfig
0278 ppc64le_defconfig:
0279         $(call merge_into_defconfig,ppc64_defconfig,le)
0280
0281 PHONY += ppc64le_guest_defconfig
0282 ppc64le_guest_defconfig:
0283         $(call merge_into_defconfig,ppc64_defconfig,le guest)
0284
0285 PHONY += ppc64_guest_defconfig
0286 ppc64_guest_defconfig:
0287         $(call merge_into_defconfig,ppc64_defconfig,be guest)
0288
0289 PHONY += powernv_be_defconfig
0290 powernv_be_defconfig:
0291         $(call merge_into_defconfig,powernv_defconfig,be)
0292
0293 PHONY += mpc85xx_defconfig
0294 mpc85xx_defconfig:
0295         $(call merge_into_defconfig,mpc85xx_base.config,\
0296                 85xx-32bit 85xx-hw fsl-emb-nonhw)
0297
0298 PHONY += mpc85xx_smp_defconfig
0299 mpc85xx_smp_defconfig:
0300         $(call merge_into_defconfig,mpc85xx_base.config,\
0301                 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
0302
0303 PHONY += corenet32_smp_defconfig
0304 corenet32_smp_defconfig:
0305         $(call merge_into_defconfig,corenet_base.config,\
0306                 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
0307
0308 PHONY += corenet64_smp_defconfig
0309 corenet64_smp_defconfig:
0310         $(call merge_into_defconfig,corenet_base.config,\
0311                 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
0312
0313 PHONY += mpc86xx_defconfig
0314 mpc86xx_defconfig:
0315         $(call merge_into_defconfig,mpc86xx_base.config,\
0316                 86xx-hw fsl-emb-nonhw)
0317
0318 PHONY += mpc86xx_smp_defconfig
0319 mpc86xx_smp_defconfig:
0320         $(call merge_into_defconfig,mpc86xx_base.config,\
0321                 86xx-smp 86xx-hw fsl-emb-nonhw)
0322
0323 PHONY += ppc32_allmodconfig
0324 ppc32_allmodconfig:
0325         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
0326                 -f $(srctree)/Makefile allmodconfig
0327
0328 PHONY += ppc_defconfig
0329 ppc_defconfig:
0330         $(call merge_into_defconfig,book3s_32.config,)
0331
0332 PHONY += ppc64le_allmodconfig
0333 ppc64le_allmodconfig:
0334         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
0335                 -f $(srctree)/Makefile allmodconfig
0336
0337 PHONY += ppc64le_allnoconfig
0338 ppc64le_allnoconfig:
0339         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
0340                 -f $(srctree)/Makefile allnoconfig
0341
0342 PHONY += ppc64_book3e_allmodconfig
0343 ppc64_book3e_allmodconfig:
0344         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
0345                 -f $(srctree)/Makefile allmodconfig
0346
0347 PHONY += ppc32_randconfig
0348 ppc32_randconfig:
0349         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
0350                 -f $(srctree)/Makefile randconfig
0351
0352 PHONY += ppc64_randconfig
0353 ppc64_randconfig:
0354         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
0355                 -f $(srctree)/Makefile randconfig
0356
0357 define archhelp
0358   @echo '* zImage          - Build default images selected by kernel config'
0359   @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
0360   @echo '  uImage          - U-Boot native image format'
0361   @echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
0362   @echo '                    versions which do not support device trees'
0363   @echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
0364   @echo '  simpleImage.<dt> - Firmware independent image.'
0365   @echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
0366   @echo '  install         - Install kernel using'
0367   @echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
0368   @echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
0369   @echo '                    install to $$(INSTALL_PATH) and run lilo'
0370   @echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
0371   @echo ''
0372   @echo '  Targets with <dt> embed a device tree blob inside the image'
0373   @echo '  These targets support board with firmware that does not'
0374   @echo '  support passing a device tree directly.  Replace <dt> with the'
0375   @echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
0376   @echo '  (minus the .dts extension).'
0377 endef
0378
0379 PHONY += install
0380 install:
0381         $(call cmd,install)
0382
0383 ifeq ($(KBUILD_EXTMOD),)
0384 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
0385 # In order to do that, we should use the archprepare target, but we can't since
0386 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
0387 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
0388 # Therefore we need to generate the header after prepare0 has been made, hence
0389 # this hack.
0390 prepare: vdso_prepare
0391 vdso_prepare: prepare0
0392         $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
0393                 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
0394         $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
0395                 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
0396 endif
0397
0398 archprepare: checkbin
0399
0400 archheaders:
0401         $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
0402
0403 ifdef CONFIG_STACKPROTECTOR
0404 prepare: stack_protector_prepare
0405
0406 PHONY += stack_protector_prepare
0407 stack_protector_prepare: prepare0
0408 ifdef CONFIG_PPC64
0409         $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
0410 else
0411         $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
0412 endif
0413 endif
0414
0415 PHONY += checkbin
0416 # Check toolchain versions:
0417 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
0418 checkbin:
0419         @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
0420                 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
0421                 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
0422                 echo 'in some circumstances.' ; \
0423                 echo    '*** binutils 2.23 do not define the TOC symbol ' ; \
0424                 echo -n '*** Please use a different binutils version.' ; \
0425                 false ; \
0426         fi