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$(BITS) 94KBUILD_LDFLAGS += -m elf$(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_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec) 205 206# When using '-many -mpower4' gas will first try and find a matching power4 207# mnemonic and failing that it will allow any valid mnemonic that GAS knows 208# about. GCC will pass -many to GAS when assembling, clang does not. 209# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675 210# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway... 211cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many) 212 213KBUILD_AFLAGS += $(cpu-as-y) 214KBUILD_CFLAGS += $(cpu-as-y) 215 216KBUILD_AFLAGS += $(aflags-y) 217KBUILD_CFLAGS += $(cflags-y) 218 219# Default to zImage, override when needed 220all: zImage 221 222# With make 3.82 we cannot mix normal and wildcard targets 223BOOT_TARGETS1 := zImage zImage.initrd uImage 224BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.% 225 226PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2) 227 228boot := arch/$(ARCH)/boot 229 230$(BOOT_TARGETS1): vmlinux 231 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 232$(BOOT_TARGETS2): vmlinux 233 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 234 235 236PHONY += bootwrapper_install 237bootwrapper_install: 238 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 239 240include $(srctree)/scripts/Makefile.defconf 241PHONY += pseries_le_defconfig 242pseries_le_defconfig: 243 $(call merge_into_defconfig,pseries_defconfig,le) 244 245PHONY += ppc64le_defconfig 246ppc64le_defconfig: 247 $(call merge_into_defconfig,ppc64_defconfig,le) 248 249PHONY += ppc64le_guest_defconfig 250ppc64le_guest_defconfig: 251 $(call merge_into_defconfig,ppc64_defconfig,le guest) 252 253PHONY += ppc64_guest_defconfig 254ppc64_guest_defconfig: 255 $(call merge_into_defconfig,ppc64_defconfig,be guest) 256 257PHONY += powernv_be_defconfig 258powernv_be_defconfig: 259 $(call merge_into_defconfig,powernv_defconfig,be) 260 261PHONY += mpc85xx_defconfig 262mpc85xx_defconfig: 263 $(call merge_into_defconfig,mpc85xx_base.config,\ 264 85xx-32bit 85xx-hw fsl-emb-nonhw) 265 266PHONY += mpc85xx_smp_defconfig 267mpc85xx_smp_defconfig: 268 $(call merge_into_defconfig,mpc85xx_base.config,\ 269 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw) 270 271PHONY += corenet32_smp_defconfig 272corenet32_smp_defconfig: 273 $(call merge_into_defconfig,corenet_base.config,\ 274 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa) 275 276PHONY += corenet64_smp_defconfig 277corenet64_smp_defconfig: 278 $(call merge_into_defconfig,corenet_base.config,\ 279 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa) 280 281PHONY += mpc86xx_defconfig 282mpc86xx_defconfig: 283 $(call merge_into_defconfig,mpc86xx_base.config,\ 284 86xx-hw fsl-emb-nonhw) 285 286PHONY += mpc86xx_smp_defconfig 287mpc86xx_smp_defconfig: 288 $(call merge_into_defconfig,mpc86xx_base.config,\ 289 86xx-smp 86xx-hw fsl-emb-nonhw) 290 291PHONY += ppc32_allmodconfig 292ppc32_allmodconfig: 293 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \ 294 -f $(srctree)/Makefile allmodconfig 295 296PHONY += ppc_defconfig 297ppc_defconfig: 298 $(call merge_into_defconfig,book3s_32.config,) 299 300PHONY += ppc64le_allmodconfig 301ppc64le_allmodconfig: 302 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \ 303 -f $(srctree)/Makefile allmodconfig 304 305PHONY += ppc64le_allnoconfig 306ppc64le_allnoconfig: 307 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \ 308 -f $(srctree)/Makefile allnoconfig 309 310PHONY += ppc64_book3e_allmodconfig 311ppc64_book3e_allmodconfig: 312 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \ 313 -f $(srctree)/Makefile allmodconfig 314 315PHONY += ppc32_randconfig 316ppc32_randconfig: 317 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \ 318 -f $(srctree)/Makefile randconfig 319 320PHONY += ppc64_randconfig 321ppc64_randconfig: 322 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \ 323 -f $(srctree)/Makefile randconfig 324 325define archhelp 326 @echo '* zImage - Build default images selected by kernel config' 327 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)' 328 @echo ' uImage - U-Boot native image format' 329 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older' 330 @echo ' versions which do not support device trees' 331 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob' 332 @echo ' simpleImage.<dt> - Firmware independent image.' 333 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)' 334 @echo ' install - Install kernel using' 335 @echo ' (your) ~/bin/$(INSTALLKERNEL) or' 336 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 337 @echo ' install to $$(INSTALL_PATH) and run lilo' 338 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs' 339 @echo '' 340 @echo ' Targets with <dt> embed a device tree blob inside the image' 341 @echo ' These targets support board with firmware that does not' 342 @echo ' support passing a device tree directly. Replace <dt> with the' 343 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory' 344 @echo ' (minus the .dts extension).' 345endef 346 347PHONY += install 348install: 349 $(call cmd,install) 350 351ifeq ($(KBUILD_EXTMOD),) 352# We need to generate vdso-offsets.h before compiling certain files in kernel/. 353# In order to do that, we should use the archprepare target, but we can't since 354# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 355# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 356# Therefore we need to generate the header after prepare0 has been made, hence 357# this hack. 358prepare: vdso_prepare 359vdso_prepare: prepare0 360 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \ 361 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h) 362 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \ 363 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h) 364endif 365 366archprepare: checkbin 367 368archheaders: 369 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all 370 371ifdef CONFIG_STACKPROTECTOR 372prepare: stack_protector_prepare 373 374PHONY += stack_protector_prepare 375stack_protector_prepare: prepare0 376ifdef CONFIG_PPC64 377 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) 378else 379 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) 380endif 381endif 382 383PHONY += checkbin 384# Check toolchain versions: 385# - gcc-4.6 is the minimum kernel-wide version so nothing required. 386checkbin: 387 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \ 388 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \ 389 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \ 390 echo 'in some circumstances.' ; \ 391 echo '*** binutils 2.23 do not define the TOC symbol ' ; \ 392 echo -n '*** Please use a different binutils version.' ; \ 393 false ; \ 394 fi 395