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 := $(LDFLAGS_vmlinux-y) 108 109ifdef CONFIG_PPC64 110ifndef CONFIG_PPC_KERNEL_PCREL 111ifeq ($(call cc-option-yn,-mcmodel=medium),y) 112 # -mcmodel=medium breaks modules because it uses 32bit offsets from 113 # the TOC pointer to create pointers where possible. Pointers into the 114 # percpu data area are created by this method. 115 # 116 # The kernel module loader relocates the percpu data section from the 117 # original location (starting with 0xd...) to somewhere in the base 118 # kernel percpu data space (starting with 0xc...). We need a full 119 # 64bit relocation for this to work, hence -mcmodel=large. 120 KBUILD_CFLAGS_MODULE += -mcmodel=large 121else 122 export NO_MINIMAL_TOC := -mno-minimal-toc 123endif 124endif 125endif 126 127CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no) 128ifdef CONFIG_PPC64_ELF_ABI_V2 129CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc)) 130else 131ifndef CONFIG_CC_IS_CLANG 132CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) 133CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc) 134endif 135endif 136CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc)) 137CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions) 138CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128) 139 140# Clang unconditionally reserves r2 on ppc32 and does not support the flag 141# https://bugs.llvm.org/show_bug.cgi?id=39555 142CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2) 143 144# Clang doesn't support -mmultiple / -mno-multiple 145# https://bugs.llvm.org/show_bug.cgi?id=39556 146CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD)) 147 148CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata) 149 150ifdef CONFIG_FUNCTION_TRACER 151CC_FLAGS_FTRACE := -pg 152ifdef CONFIG_MPROFILE_KERNEL 153CC_FLAGS_FTRACE += -mprofile-kernel 154endif 155endif 156 157CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 158AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 159 160CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \ 161 $(call cc-option,-mtune=power9, \ 162 $(call cc-option,-mtune=power8))) 163 164asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) 165 166KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr) 167KBUILD_AFLAGS += $(AFLAGS-y) 168KBUILD_CFLAGS += $(call cc-option,-msoft-float) 169KBUILD_CFLAGS += -pipe $(CFLAGS-y) 170CPP = $(CC) -E $(KBUILD_CFLAGS) 171 172CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__ 173ifdef CONFIG_CPU_BIG_ENDIAN 174CHECKFLAGS += -D__BIG_ENDIAN__ 175else 176CHECKFLAGS += -D__LITTLE_ENDIAN__ 177endif 178 179ifdef CONFIG_476FPE_ERR46 180 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \ 181 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds 182endif 183 184# No prefix or pcrel 185ifdef CONFIG_PPC_KERNEL_PREFIXED 186KBUILD_CFLAGS += $(call cc-option,-mprefixed) 187else 188KBUILD_CFLAGS += $(call cc-option,-mno-prefixed) 189endif 190ifdef CONFIG_PPC_KERNEL_PCREL 191KBUILD_CFLAGS += $(call cc-option,-mpcrel) 192else 193KBUILD_CFLAGS += $(call cc-option,-mno-pcrel) 194endif 195 196# No AltiVec or VSX or MMA instructions when building kernel 197KBUILD_CFLAGS += $(call cc-option,-mno-altivec) 198KBUILD_CFLAGS += $(call cc-option,-mno-vsx) 199KBUILD_CFLAGS += $(call cc-option,-mno-mma) 200 201# No SPE instruction when building kernel 202# (We use all available options to help semi-broken compilers) 203KBUILD_CFLAGS += $(call cc-option,-mno-spe) 204KBUILD_CFLAGS += $(call cc-option,-mspe=no) 205 206# Don't emit .eh_frame since we have no use for it 207KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 208 209# Never use string load/store instructions as they are 210# often slow when they are implemented at all 211KBUILD_CFLAGS += $(call cc-option,-mno-string) 212 213cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec) 214 215# When using '-many -mpower4' gas will first try and find a matching power4 216# mnemonic and failing that it will allow any valid mnemonic that GAS knows 217# about. GCC will pass -many to GAS when assembling, clang does not. 218# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675 219# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway... 220cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many) 221 222KBUILD_AFLAGS += $(cpu-as-y) 223KBUILD_CFLAGS += $(cpu-as-y) 224 225KBUILD_AFLAGS += $(aflags-y) 226KBUILD_CFLAGS += $(cflags-y) 227 228# Default to zImage, override when needed 229all: zImage 230 231# With make 3.82 we cannot mix normal and wildcard targets 232BOOT_TARGETS1 := zImage zImage.initrd uImage 233BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.% 234 235PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2) 236 237boot := arch/$(ARCH)/boot 238 239$(BOOT_TARGETS1): vmlinux 240 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 241$(BOOT_TARGETS2): vmlinux 242 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 243 244 245PHONY += bootwrapper_install 246bootwrapper_install: 247 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@) 248 249include $(srctree)/scripts/Makefile.defconf 250 251generated_configs += pseries_le_defconfig 252pseries_le_defconfig: 253 $(call merge_into_defconfig,pseries_defconfig,le) 254 255generated_configs += ppc64le_defconfig 256ppc64le_defconfig: 257 $(call merge_into_defconfig,ppc64_defconfig,le) 258 259generated_configs += ppc64le_guest_defconfig 260ppc64le_guest_defconfig: 261 $(call merge_into_defconfig,ppc64_defconfig,le guest) 262 263generated_configs += ppc64_guest_defconfig 264ppc64_guest_defconfig: 265 $(call merge_into_defconfig,ppc64_defconfig,be guest) 266 267generated_configs += powernv_be_defconfig 268powernv_be_defconfig: 269 $(call merge_into_defconfig,powernv_defconfig,be) 270 271generated_configs += mpc85xx_defconfig 272mpc85xx_defconfig: 273 $(call merge_into_defconfig,mpc85xx_base.config,\ 274 85xx-32bit 85xx-hw fsl-emb-nonhw) 275 276generated_configs += mpc85xx_smp_defconfig 277mpc85xx_smp_defconfig: 278 $(call merge_into_defconfig,mpc85xx_base.config,\ 279 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw) 280 281generated_configs += corenet32_smp_defconfig 282corenet32_smp_defconfig: 283 $(call merge_into_defconfig,corenet_base.config,\ 284 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa) 285 286generated_configs += corenet64_smp_defconfig 287corenet64_smp_defconfig: 288 $(call merge_into_defconfig,corenet_base.config,\ 289 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa) 290 291generated_configs += mpc86xx_defconfig 292mpc86xx_defconfig: 293 $(call merge_into_defconfig,mpc86xx_base.config,\ 294 86xx-hw fsl-emb-nonhw) 295 296generated_configs += mpc86xx_smp_defconfig 297mpc86xx_smp_defconfig: 298 $(call merge_into_defconfig,mpc86xx_base.config,\ 299 86xx-smp 86xx-hw fsl-emb-nonhw) 300 301generated_configs += ppc32_allmodconfig 302ppc32_allmodconfig: 303 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \ 304 -f $(srctree)/Makefile allmodconfig 305 306generated_configs += ppc_defconfig 307ppc_defconfig: 308 $(call merge_into_defconfig,book3s_32.config,) 309 310generated_configs += ppc64le_allmodconfig 311ppc64le_allmodconfig: 312 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \ 313 -f $(srctree)/Makefile allmodconfig 314 315generated_configs += ppc64le_allnoconfig 316ppc64le_allnoconfig: 317 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \ 318 -f $(srctree)/Makefile allnoconfig 319 320generated_configs += ppc64_book3e_allmodconfig 321ppc64_book3e_allmodconfig: 322 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \ 323 -f $(srctree)/Makefile allmodconfig 324 325generated_configs += ppc32_randconfig 326ppc32_randconfig: 327 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \ 328 -f $(srctree)/Makefile randconfig 329 330generated_configs += ppc64_randconfig 331ppc64_randconfig: 332 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \ 333 -f $(srctree)/Makefile randconfig 334 335PHONY += $(generated_configs) 336 337define archhelp 338 echo '* zImage - Build default images selected by kernel config' 339 echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)' 340 echo ' uImage - U-Boot native image format' 341 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older' 342 echo ' versions which do not support device trees' 343 echo ' dtbImage.<dt> - zImage with an embedded device tree blob' 344 echo ' simpleImage.<dt> - Firmware independent image.' 345 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)' 346 echo ' install - Install kernel using' 347 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 348 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 349 echo ' install to $$(INSTALL_PATH) and run lilo' 350 echo ' *_defconfig - Select default config from arch/$(ARCH)/configs' 351 echo '' 352 echo ' Targets with <dt> embed a device tree blob inside the image' 353 echo ' These targets support board with firmware that does not' 354 echo ' support passing a device tree directly. Replace <dt> with the' 355 echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory' 356 echo ' (minus the .dts extension).' 357 echo 358 $(foreach cfg,$(generated_configs), 359 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));) 360endef 361 362PHONY += install 363install: 364 $(call cmd,install) 365 366ifeq ($(KBUILD_EXTMOD),) 367# We need to generate vdso-offsets.h before compiling certain files in kernel/. 368# In order to do that, we should use the archprepare target, but we can't since 369# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 370# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 371# Therefore we need to generate the header after prepare0 has been made, hence 372# this hack. 373prepare: vdso_prepare 374vdso_prepare: prepare0 375 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \ 376 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h) 377 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \ 378 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h) 379endif 380 381archprepare: checkbin 382 383archheaders: 384 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all 385 386ifdef CONFIG_STACKPROTECTOR 387prepare: stack_protector_prepare 388 389PHONY += stack_protector_prepare 390stack_protector_prepare: prepare0 391ifdef CONFIG_PPC64 392 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) 393else 394 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) 395endif 396endif 397 398PHONY += checkbin 399# Check toolchain versions: 400# - gcc-4.6 is the minimum kernel-wide version so nothing required. 401checkbin: 402 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \ 403 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \ 404 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \ 405 echo 'in some circumstances.' ; \ 406 echo '*** binutils 2.23 do not define the TOC symbol ' ; \ 407 echo -n '*** Please use a different binutils version.' ; \ 408 false ; \ 409 fi 410