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 13HAS_BIARCH := $(call cc-option-yn, -m32) 14 15# Set default 32 bits cross compilers for vdso and boot wrapper 16CROSS32_COMPILE ?= 17 18# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use 19# ppc64_defconfig because we have nothing better to go on. 20uname := $(shell uname -m) 21KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig 22 23new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi) 24 25ifeq ($(new_nm),y) 26NM := $(NM) --synthetic 27endif 28 29# BITS is used as extension for files which are available in a 32 bit 30# and a 64 bit version to simplify shared Makefiles. 31# e.g.: obj-y += foo_$(BITS).o 32export BITS 33 34ifdef CONFIG_PPC64 35 BITS := 64 36else 37 BITS := 32 38endif 39 40machine-y = ppc 41machine-$(CONFIG_PPC64) += 64 42machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le 43UTS_MACHINE := $(subst $(space),,$(machine-y)) 44 45# XXX This needs to be before we override LD below 46ifdef CONFIG_PPC32 47KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o 48else 49ifeq ($(call ld-ifversion, -ge, 22500, y),y) 50# Have the linker provide sfpr if possible. 51# There is a corresponding test in arch/powerpc/lib/Makefile 52KBUILD_LDFLAGS_MODULE += --save-restore-funcs 53else 54KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o 55endif 56endif 57 58ifdef CONFIG_CPU_LITTLE_ENDIAN 59KBUILD_CFLAGS += -mlittle-endian 60KBUILD_LDFLAGS += -EL 61LDEMULATION := lppc 62GNUTARGET := powerpcle 63MULTIPLEWORD := -mno-multiple 64KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect) 65else 66KBUILD_CFLAGS += $(call cc-option,-mbig-endian) 67KBUILD_LDFLAGS += -EB 68LDEMULATION := ppc 69GNUTARGET := powerpc 70MULTIPLEWORD := -mmultiple 71endif 72 73ifdef CONFIG_PPC64 74ifndef CONFIG_CC_IS_CLANG 75cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1) 76cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc) 77aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1) 78aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2 79endif 80endif 81 82ifndef CONFIG_CC_IS_CLANG 83 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align 84endif 85 86cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) 87cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian 88aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) 89aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian 90 91ifeq ($(HAS_BIARCH),y) 92KBUILD_CFLAGS += -m$(BITS) 93KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS) 94KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION) 95endif 96 97cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls 98ifdef CONFIG_PPC64 99cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13 100else 101cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2 102endif 103 104LDFLAGS_vmlinux-y := -Bstatic 105LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie 106LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext 107LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) 108 109ifdef CONFIG_PPC64 110ifeq ($(call cc-option-yn,-mcmodel=medium),y) 111 # -mcmodel=medium breaks modules because it uses 32bit offsets from 112 # the TOC pointer to create pointers where possible. Pointers into the 113 # percpu data area are created by this method. 114 # 115 # The kernel module loader relocates the percpu data section from the 116 # original location (starting with 0xd...) to somewhere in the base 117 # kernel percpu data space (starting with 0xc...). We need a full 118 # 64bit relocation for this to work, hence -mcmodel=large. 119 KBUILD_CFLAGS_MODULE += -mcmodel=large 120else 121 export NO_MINIMAL_TOC := -mno-minimal-toc 122endif 123endif 124 125CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no) 126ifndef CONFIG_CC_IS_CLANG 127ifdef CONFIG_PPC64_ELF_ABI_V2 128CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc)) 129AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2) 130else 131CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) 132CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc) 133AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) 134endif 135endif 136CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc)) 137CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions) 138 139# Clang unconditionally reserves r2 on ppc32 and does not support the flag 140# https://bugs.llvm.org/show_bug.cgi?id=39555 141CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2) 142 143# Clang doesn't support -mmultiple / -mno-multiple 144# https://bugs.llvm.org/show_bug.cgi?id=39556 145CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD)) 146 147CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata) 148 149ifdef CONFIG_FUNCTION_TRACER 150CC_FLAGS_FTRACE := -pg 151ifdef CONFIG_MPROFILE_KERNEL 152CC_FLAGS_FTRACE += -mprofile-kernel 153endif 154endif 155 156CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 157AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 158 159CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \ 160 $(call cc-option,-mtune=power9, \ 161 $(call cc-option,-mtune=power8))) 162 163asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) 164 165KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr) 166KBUILD_AFLAGS += $(AFLAGS-y) 167KBUILD_CFLAGS += $(call cc-option,-msoft-float) 168KBUILD_CFLAGS += -pipe $(CFLAGS-y) 169CPP = $(CC) -E $(KBUILD_CFLAGS) 170 171CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__ 172ifdef CONFIG_CPU_BIG_ENDIAN 173CHECKFLAGS += -D__BIG_ENDIAN__ 174else 175CHECKFLAGS += -D__LITTLE_ENDIAN__ 176endif 177 178ifdef CONFIG_476FPE_ERR46 179 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \ 180 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds 181endif 182 183# No prefix or pcrel 184KBUILD_CFLAGS += $(call cc-option,-mno-prefixed) 185KBUILD_CFLAGS += $(call cc-option,-mno-pcrel) 186 187# No AltiVec or VSX or MMA instructions when building kernel 188KBUILD_CFLAGS += $(call cc-option,-mno-altivec) 189KBUILD_CFLAGS += $(call cc-option,-mno-vsx) 190KBUILD_CFLAGS += $(call cc-option,-mno-mma) 191 192# No SPE instruction when building kernel 193# (We use all available options to help semi-broken compilers) 194KBUILD_CFLAGS += $(call cc-option,-mno-spe) 195KBUILD_CFLAGS += $(call cc-option,-mspe=no) 196 197# Don't emit .eh_frame since we have no use for it 198KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 199 200# Never use string load/store instructions as they are 201# often slow when they are implemented at all 202KBUILD_CFLAGS += $(call cc-option,-mno-string) 203 204cpu-as-$(CONFIG_40x) += -Wa,-m405 205cpu-as-$(CONFIG_44x) += -Wa,-m440 206cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec) 207cpu-as-$(CONFIG_PPC_E500) += -Wa,-me500 208 209# When using '-many -mpower4' gas will first try and find a matching power4 210# mnemonic and failing that it will allow any valid mnemonic that GAS knows 211# about. GCC will pass -many to GAS when assembling, clang does not. 212# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675 213# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway... 214cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many) 215cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc) 216 217KBUILD_AFLAGS += $(cpu-as-y) 218KBUILD_CFLAGS += $(cpu-as-y) 219 220KBUILD_AFLAGS += $(aflags-y) 221KBUILD_CFLAGS += $(cflags-y) 222 223# Default to zImage, override when needed 224all: zImage 225 226# With make 3.82 we cannot mix normal and wildcard targets 227BOOT_TARGETS1 := zImage zImage.initrd uImage 228BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.% 229 230PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2) 231 232boot := arch/$(ARCH)/boot 233 234$(BOOT_TARGETS1): vmlinux 235 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 236$(BOOT_TARGETS2): vmlinux 237 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 238 239 240PHONY += bootwrapper_install 241bootwrapper_install: 242 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 243 244# Used to create 'merged defconfigs' 245# To use it $(call) it with the first argument as the base defconfig 246# and the second argument as a space separated list of .config files to merge, 247# without the .config suffix. 248define merge_into_defconfig 249 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \ 250 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \ 251 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config) 252 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig 253endef 254 255PHONY += pseries_le_defconfig 256pseries_le_defconfig: 257 $(call merge_into_defconfig,pseries_defconfig,le) 258 259PHONY += ppc64le_defconfig 260ppc64le_defconfig: 261 $(call merge_into_defconfig,ppc64_defconfig,le) 262 263PHONY += ppc64le_guest_defconfig 264ppc64le_guest_defconfig: 265 $(call merge_into_defconfig,ppc64_defconfig,le guest) 266 267PHONY += ppc64_guest_defconfig 268ppc64_guest_defconfig: 269 $(call merge_into_defconfig,ppc64_defconfig,be guest) 270 271PHONY += powernv_be_defconfig 272powernv_be_defconfig: 273 $(call merge_into_defconfig,powernv_defconfig,be) 274 275PHONY += mpc85xx_defconfig 276mpc85xx_defconfig: 277 $(call merge_into_defconfig,mpc85xx_base.config,\ 278 85xx-32bit 85xx-hw fsl-emb-nonhw) 279 280PHONY += mpc85xx_smp_defconfig 281mpc85xx_smp_defconfig: 282 $(call merge_into_defconfig,mpc85xx_base.config,\ 283 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw) 284 285PHONY += corenet32_smp_defconfig 286corenet32_smp_defconfig: 287 $(call merge_into_defconfig,corenet_base.config,\ 288 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa) 289 290PHONY += corenet64_smp_defconfig 291corenet64_smp_defconfig: 292 $(call merge_into_defconfig,corenet_base.config,\ 293 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa) 294 295PHONY += mpc86xx_defconfig 296mpc86xx_defconfig: 297 $(call merge_into_defconfig,mpc86xx_base.config,\ 298 86xx-hw fsl-emb-nonhw) 299 300PHONY += mpc86xx_smp_defconfig 301mpc86xx_smp_defconfig: 302 $(call merge_into_defconfig,mpc86xx_base.config,\ 303 86xx-smp 86xx-hw fsl-emb-nonhw) 304 305PHONY += ppc32_allmodconfig 306ppc32_allmodconfig: 307 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \ 308 -f $(srctree)/Makefile allmodconfig 309 310PHONY += ppc_defconfig 311ppc_defconfig: 312 $(call merge_into_defconfig,book3s_32.config,) 313 314PHONY += ppc64le_allmodconfig 315ppc64le_allmodconfig: 316 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \ 317 -f $(srctree)/Makefile allmodconfig 318 319PHONY += ppc64le_allnoconfig 320ppc64le_allnoconfig: 321 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \ 322 -f $(srctree)/Makefile allnoconfig 323 324PHONY += ppc64_book3e_allmodconfig 325ppc64_book3e_allmodconfig: 326 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \ 327 -f $(srctree)/Makefile allmodconfig 328 329PHONY += ppc32_randconfig 330ppc32_randconfig: 331 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \ 332 -f $(srctree)/Makefile randconfig 333 334PHONY += ppc64_randconfig 335ppc64_randconfig: 336 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \ 337 -f $(srctree)/Makefile randconfig 338 339define archhelp 340 @echo '* zImage - Build default images selected by kernel config' 341 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)' 342 @echo ' uImage - U-Boot native image format' 343 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older' 344 @echo ' versions which do not support device trees' 345 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob' 346 @echo ' simpleImage.<dt> - Firmware independent image.' 347 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)' 348 @echo ' install - Install kernel using' 349 @echo ' (your) ~/bin/$(INSTALLKERNEL) or' 350 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 351 @echo ' install to $$(INSTALL_PATH) and run lilo' 352 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs' 353 @echo '' 354 @echo ' Targets with <dt> embed a device tree blob inside the image' 355 @echo ' These targets support board with firmware that does not' 356 @echo ' support passing a device tree directly. Replace <dt> with the' 357 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory' 358 @echo ' (minus the .dts extension).' 359endef 360 361PHONY += install 362install: 363 $(call cmd,install) 364 365ifeq ($(KBUILD_EXTMOD),) 366# We need to generate vdso-offsets.h before compiling certain files in kernel/. 367# In order to do that, we should use the archprepare target, but we can't since 368# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 369# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 370# Therefore we need to generate the header after prepare0 has been made, hence 371# this hack. 372prepare: vdso_prepare 373vdso_prepare: prepare0 374 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \ 375 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h) 376 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \ 377 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h) 378endif 379 380archprepare: checkbin 381 382archheaders: 383 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all 384 385ifdef CONFIG_STACKPROTECTOR 386prepare: stack_protector_prepare 387 388PHONY += stack_protector_prepare 389stack_protector_prepare: prepare0 390ifdef CONFIG_PPC64 391 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) 392else 393 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) 394endif 395endif 396 397PHONY += checkbin 398# Check toolchain versions: 399# - gcc-4.6 is the minimum kernel-wide version so nothing required. 400checkbin: 401 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \ 402 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \ 403 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \ 404 echo 'in some circumstances.' ; \ 405 echo '*** binutils 2.23 do not define the TOC symbol ' ; \ 406 echo -n '*** Please use a different binutils version.' ; \ 407 false ; \ 408 fi 409