1# This file is included by the global makefile so that you can add your own 2# architecture-specific flags and dependencies. 3# 4# This file is subject to the terms and conditions of the GNU General Public 5# License. See the file "COPYING" in the main directory of this archive 6# for more details. 7# 8# Copyright (C) 1994 by Linus Torvalds 9# Changes for PPC by Gary Thomas 10# Rewritten by Cort Dougan and Paul Mackerras 11# 12 13ifdef cross_compiling 14 ifeq ($(CROSS_COMPILE),) 15 # Auto detect cross compiler prefix. 16 # Look for: (powerpc(64(le)?)?)(-unknown)?-linux(-gnu)?- 17 CC_ARCHES := powerpc powerpc64 powerpc64le 18 CC_SUFFIXES := linux linux-gnu unknown-linux-gnu 19 CROSS_COMPILE := $(call cc-cross-prefix, $(foreach a,$(CC_ARCHES), \ 20 $(foreach s,$(CC_SUFFIXES),$(a)-$(s)-))) 21 endif 22endif 23 24HAS_BIARCH := $(call cc-option-yn, -m32) 25 26# Set default 32 bits cross compilers for vdso and boot wrapper 27CROSS32_COMPILE ?= 28 29# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use 30# ppc64le_defconfig because we have nothing better to go on. 31uname := $(shell uname -m) 32KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64le)_defconfig 33 34new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi) 35 36ifeq ($(new_nm),y) 37NM := $(NM) --synthetic 38endif 39 40# BITS is used as extension for files which are available in a 32 bit 41# and a 64 bit version to simplify shared Makefiles. 42# e.g.: obj-y += foo_$(BITS).o 43export BITS 44 45ifdef CONFIG_PPC64 46 BITS := 64 47else 48 BITS := 32 49endif 50 51machine-y = ppc 52machine-$(CONFIG_PPC64) += 64 53machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le 54UTS_MACHINE := $(subst $(space),,$(machine-y)) 55 56ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy) 57# Have the linker provide sfpr if possible. 58# There is a corresponding test in arch/powerpc/lib/Makefile 59KBUILD_LDFLAGS_MODULE += --save-restore-funcs 60else 61KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o 62endif 63 64ifdef CONFIG_CPU_LITTLE_ENDIAN 65KBUILD_CFLAGS += -mlittle-endian 66KBUILD_LDFLAGS += -EL 67LDEMULATION := lppc 68GNUTARGET := powerpcle 69MULTIPLEWORD := -mno-multiple 70KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect) 71else 72KBUILD_CFLAGS += $(call cc-option,-mbig-endian) 73KBUILD_LDFLAGS += -EB 74LDEMULATION := ppc 75GNUTARGET := powerpc 76MULTIPLEWORD := -mmultiple 77endif 78 79ifdef CONFIG_PPC64 80ifndef CONFIG_CC_IS_CLANG 81cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1) 82cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc) 83aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1) 84aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2 85endif 86endif 87 88ifndef CONFIG_CC_IS_CLANG 89 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align 90endif 91 92cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) 93cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian 94aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) 95aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian 96 97ifeq ($(HAS_BIARCH),y) 98KBUILD_CFLAGS += -m$(BITS) 99KBUILD_AFLAGS += -m$(BITS) 100KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION) 101endif 102 103cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls 104ifdef CONFIG_PPC64 105cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13 106else 107cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2 108endif 109 110LDFLAGS_vmlinux-y := -Bstatic 111LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie 112LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext 113LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) 114 115ifdef CONFIG_PPC64 116ifndef CONFIG_PPC_KERNEL_PCREL 117ifeq ($(call cc-option-yn,-mcmodel=medium),y) 118 # -mcmodel=medium breaks modules because it uses 32bit offsets from 119 # the TOC pointer to create pointers where possible. Pointers into the 120 # percpu data area are created by this method. 121 # 122 # The kernel module loader relocates the percpu data section from the 123 # original location (starting with 0xd...) to somewhere in the base 124 # kernel percpu data space (starting with 0xc...). We need a full 125 # 64bit relocation for this to work, hence -mcmodel=large. 126 KBUILD_CFLAGS_MODULE += -mcmodel=large 127else 128 export NO_MINIMAL_TOC := -mno-minimal-toc 129endif 130endif 131endif 132 133CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no) 134ifdef CONFIG_PPC64_ELF_ABI_V2 135CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc)) 136else 137ifndef CONFIG_CC_IS_CLANG 138CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) 139CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc) 140endif 141endif 142CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc)) 143CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions) 144CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128) 145 146# Clang unconditionally reserves r2 on ppc32 and does not support the flag 147# https://bugs.llvm.org/show_bug.cgi?id=39555 148CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2) 149 150# Clang doesn't support -mmultiple / -mno-multiple 151# https://bugs.llvm.org/show_bug.cgi?id=39556 152CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD)) 153 154CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata) 155 156ifdef CONFIG_FUNCTION_TRACER 157ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY 158KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 159CC_FLAGS_FTRACE := -fpatchable-function-entry=2 160else 161CC_FLAGS_FTRACE := -pg 162ifdef CONFIG_MPROFILE_KERNEL 163CC_FLAGS_FTRACE += -mprofile-kernel 164endif 165endif 166endif 167 168CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 169AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 170 171CFLAGS-y += $(CONFIG_TUNE_CPU) 172 173asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) 174 175KBUILD_CPPFLAGS += -I $(srctree)/arch/powerpc $(asinstr) 176KBUILD_AFLAGS += $(AFLAGS-y) 177KBUILD_CFLAGS += $(call cc-option,-msoft-float) 178KBUILD_CFLAGS += $(CFLAGS-y) 179CPP = $(CC) -E $(KBUILD_CFLAGS) 180 181CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__ 182ifdef CONFIG_CPU_BIG_ENDIAN 183CHECKFLAGS += -D__BIG_ENDIAN__ 184else 185CHECKFLAGS += -D__LITTLE_ENDIAN__ 186endif 187 188ifdef CONFIG_476FPE_ERR46 189 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \ 190 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds 191endif 192 193# No prefix or pcrel 194ifdef CONFIG_PPC_KERNEL_PREFIXED 195KBUILD_CFLAGS += $(call cc-option,-mprefixed) 196else 197KBUILD_CFLAGS += $(call cc-option,-mno-prefixed) 198endif 199ifdef CONFIG_PPC_KERNEL_PCREL 200KBUILD_CFLAGS += $(call cc-option,-mpcrel) 201else 202KBUILD_CFLAGS += $(call cc-option,-mno-pcrel) 203endif 204 205# No AltiVec or VSX or MMA instructions when building kernel 206KBUILD_CFLAGS += $(call cc-option,-mno-altivec) 207KBUILD_CFLAGS += $(call cc-option,-mno-vsx) 208KBUILD_CFLAGS += $(call cc-option,-mno-mma) 209 210# No SPE instruction when building kernel 211# (We use all available options to help semi-broken compilers) 212KBUILD_CFLAGS += $(call cc-option,-mno-spe) 213KBUILD_CFLAGS += $(call cc-option,-mspe=no) 214 215# Don't emit .eh_frame since we have no use for it 216KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 217 218# Never use string load/store instructions as they are 219# often slow when they are implemented at all 220KBUILD_CFLAGS += $(call cc-option,-mno-string) 221 222cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec) 223 224# When using '-many -mpower4' gas will first try and find a matching power4 225# mnemonic and failing that it will allow any valid mnemonic that GAS knows 226# about. GCC will pass -many to GAS when assembling, clang does not. 227# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675 228# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway... 229cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many) 230 231KBUILD_AFLAGS += $(cpu-as-y) 232KBUILD_CFLAGS += $(cpu-as-y) 233 234KBUILD_AFLAGS += $(aflags-y) 235KBUILD_CFLAGS += $(cflags-y) 236 237# Default to zImage, override when needed 238all: zImage 239 240# With make 3.82 we cannot mix normal and wildcard targets 241BOOT_TARGETS1 := zImage zImage.initrd uImage 242BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.% 243 244PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2) 245 246boot := arch/powerpc/boot 247 248$(BOOT_TARGETS1): vmlinux 249 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 250$(BOOT_TARGETS2): vmlinux 251 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 252 253 254PHONY += bootwrapper_install 255bootwrapper_install: 256 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 257 258include $(srctree)/scripts/Makefile.defconf 259 260generated_configs += ppc64le_defconfig 261ppc64le_defconfig: 262 $(call merge_into_defconfig,ppc64_defconfig,le) 263 264generated_configs += ppc64le_guest_defconfig 265ppc64le_guest_defconfig: 266 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest) 267 268generated_configs += ppc64_guest_defconfig 269ppc64_guest_defconfig: 270 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest) 271 272generated_configs += pseries_le_defconfig 273pseries_le_defconfig: ppc64le_guest_defconfig 274 275generated_configs += pseries_defconfig 276pseries_defconfig: ppc64le_guest_defconfig 277 278generated_configs += powernv_be_defconfig 279powernv_be_defconfig: 280 $(call merge_into_defconfig,powernv_defconfig,be) 281 282generated_configs += mpc85xx_defconfig 283mpc85xx_defconfig: 284 $(call merge_into_defconfig,mpc85xx_base.config,\ 285 85xx-32bit 85xx-hw fsl-emb-nonhw) 286 287generated_configs += mpc85xx_smp_defconfig 288mpc85xx_smp_defconfig: 289 $(call merge_into_defconfig,mpc85xx_base.config,\ 290 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw) 291 292generated_configs += corenet32_smp_defconfig 293corenet32_smp_defconfig: 294 $(call merge_into_defconfig,corenet_base.config,\ 295 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa) 296 297generated_configs += corenet64_smp_defconfig 298corenet64_smp_defconfig: 299 $(call merge_into_defconfig,corenet_base.config,\ 300 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa) 301 302generated_configs += mpc86xx_defconfig 303mpc86xx_defconfig: 304 $(call merge_into_defconfig,mpc86xx_base.config,\ 305 86xx-hw fsl-emb-nonhw) 306 307generated_configs += mpc86xx_smp_defconfig 308mpc86xx_smp_defconfig: 309 $(call merge_into_defconfig,mpc86xx_base.config,\ 310 86xx-smp 86xx-hw fsl-emb-nonhw) 311 312generated_configs += ppc32_allmodconfig 313ppc32_allmodconfig: 314 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \ 315 -f $(srctree)/Makefile allmodconfig 316 317generated_configs += ppc_defconfig 318ppc_defconfig: 319 $(call merge_into_defconfig,book3s_32.config,) 320 321generated_configs += ppc64le_allmodconfig 322ppc64le_allmodconfig: 323 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \ 324 -f $(srctree)/Makefile allmodconfig 325 326generated_configs += ppc64le_allnoconfig 327ppc64le_allnoconfig: 328 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \ 329 -f $(srctree)/Makefile allnoconfig 330 331generated_configs += ppc64_book3e_allmodconfig 332ppc64_book3e_allmodconfig: 333 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \ 334 -f $(srctree)/Makefile allmodconfig 335 336generated_configs += ppc32_randconfig 337ppc32_randconfig: 338 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \ 339 -f $(srctree)/Makefile randconfig 340 341generated_configs += ppc64_randconfig 342ppc64_randconfig: 343 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \ 344 -f $(srctree)/Makefile randconfig 345 346PHONY += $(generated_configs) 347 348define archhelp 349 echo '* zImage - Build default images selected by kernel config' 350 echo ' zImage.* - Compressed kernel image (arch/powerpc/boot/zImage.*)' 351 echo ' uImage - U-Boot native image format' 352 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older' 353 echo ' versions which do not support device trees' 354 echo ' dtbImage.<dt> - zImage with an embedded device tree blob' 355 echo ' simpleImage.<dt> - Firmware independent image.' 356 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)' 357 echo ' install - Install kernel using' 358 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 359 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 360 echo ' install to $$(INSTALL_PATH) and run lilo' 361 echo ' *_defconfig - Select default config from arch/powerpc/configs' 362 echo '' 363 echo ' Targets with <dt> embed a device tree blob inside the image' 364 echo ' These targets support board with firmware that does not' 365 echo ' support passing a device tree directly. Replace <dt> with the' 366 echo ' name of a dts file from the arch/powerpc/boot/dts/ directory' 367 echo ' (minus the .dts extension).' 368 echo 369 $(foreach cfg,$(generated_configs), 370 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));) 371endef 372 373PHONY += install 374install: 375 $(call cmd,install) 376 377ifeq ($(KBUILD_EXTMOD),) 378# We need to generate vdso-offsets.h before compiling certain files in kernel/. 379# In order to do that, we should use the archprepare target, but we can't since 380# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 381# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 382# Therefore we need to generate the header after prepare0 has been made, hence 383# this hack. 384prepare: vdso_prepare 385vdso_prepare: prepare0 386 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \ 387 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h) 388 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \ 389 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h) 390endif 391 392archprepare: checkbin 393 394archheaders: 395 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all 396 397ifdef CONFIG_STACKPROTECTOR 398prepare: stack_protector_prepare 399 400PHONY += stack_protector_prepare 401stack_protector_prepare: prepare0 402ifdef CONFIG_PPC64 403 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) 404else 405 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) 406endif 407endif 408 409PHONY += checkbin 410checkbin: 411 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \ 412 "x${CONFIG_LD_IS_BFD}" = "xy" -a \ 413 "${CONFIG_LD_VERSION}" = "23700" ; then \ 414 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \ 415 echo 'is unable to handle.' ; \ 416 echo '*** Please use a different binutils version.' ; \ 417 false ; \ 418 fi 419