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 45ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy) 46# Have the linker provide sfpr if possible. 47# There is a corresponding test in arch/powerpc/lib/Makefile 48KBUILD_LDFLAGS_MODULE += --save-restore-funcs 49else 50KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o 51endif 52 53ifdef CONFIG_CPU_LITTLE_ENDIAN 54KBUILD_CFLAGS += -mlittle-endian 55KBUILD_LDFLAGS += -EL 56LDEMULATION := lppc 57GNUTARGET := powerpcle 58MULTIPLEWORD := -mno-multiple 59KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect) 60else 61KBUILD_CFLAGS += $(call cc-option,-mbig-endian) 62KBUILD_LDFLAGS += -EB 63LDEMULATION := ppc 64GNUTARGET := powerpc 65MULTIPLEWORD := -mmultiple 66endif 67 68ifdef CONFIG_PPC64 69ifndef CONFIG_CC_IS_CLANG 70cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1) 71cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc) 72aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1) 73aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2 74endif 75endif 76 77ifndef CONFIG_CC_IS_CLANG 78 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align 79endif 80 81cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) 82cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian 83aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian) 84aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian 85 86ifeq ($(HAS_BIARCH),y) 87KBUILD_CFLAGS += -m$(BITS) 88KBUILD_AFLAGS += -m$(BITS) 89KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION) 90endif 91 92LDFLAGS_vmlinux-y := -Bstatic 93LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie 94LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext 95LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) 96 97ifdef CONFIG_PPC64 98ifndef CONFIG_PPC_KERNEL_PCREL 99ifeq ($(call cc-option-yn,-mcmodel=medium),y) 100 # -mcmodel=medium breaks modules because it uses 32bit offsets from 101 # the TOC pointer to create pointers where possible. Pointers into the 102 # percpu data area are created by this method. 103 # 104 # The kernel module loader relocates the percpu data section from the 105 # original location (starting with 0xd...) to somewhere in the base 106 # kernel percpu data space (starting with 0xc...). We need a full 107 # 64bit relocation for this to work, hence -mcmodel=large. 108 KBUILD_CFLAGS_MODULE += -mcmodel=large 109else 110 export NO_MINIMAL_TOC := -mno-minimal-toc 111endif 112endif 113endif 114 115CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no) 116ifdef CONFIG_PPC64_ELF_ABI_V2 117CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc)) 118else 119ifndef CONFIG_CC_IS_CLANG 120CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) 121CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc) 122endif 123endif 124CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc)) 125CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions) 126CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128) 127 128# Clang unconditionally reserves r2 on ppc32 and does not support the flag 129# https://bugs.llvm.org/show_bug.cgi?id=39555 130CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2) 131 132# Clang doesn't support -mmultiple / -mno-multiple 133# https://bugs.llvm.org/show_bug.cgi?id=39556 134CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD)) 135 136CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata) 137 138ifdef CONFIG_FUNCTION_TRACER 139ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY 140KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 141CC_FLAGS_FTRACE := -fpatchable-function-entry=2 142else 143CC_FLAGS_FTRACE := -pg 144ifdef CONFIG_MPROFILE_KERNEL 145CC_FLAGS_FTRACE += -mprofile-kernel 146endif 147endif 148endif 149 150CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 151AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) 152 153CFLAGS-y += $(CONFIG_TUNE_CPU) 154 155asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) 156 157KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr) 158KBUILD_AFLAGS += $(AFLAGS-y) 159KBUILD_CFLAGS += $(call cc-option,-msoft-float) 160KBUILD_CFLAGS += $(CFLAGS-y) 161CPP = $(CC) -E $(KBUILD_CFLAGS) 162 163CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__ 164ifdef CONFIG_CPU_BIG_ENDIAN 165CHECKFLAGS += -D__BIG_ENDIAN__ 166else 167CHECKFLAGS += -D__LITTLE_ENDIAN__ 168endif 169 170ifdef CONFIG_476FPE_ERR46 171 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \ 172 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds 173endif 174 175# No prefix or pcrel 176ifdef CONFIG_PPC_KERNEL_PREFIXED 177KBUILD_CFLAGS += $(call cc-option,-mprefixed) 178else 179KBUILD_CFLAGS += $(call cc-option,-mno-prefixed) 180endif 181ifdef CONFIG_PPC_KERNEL_PCREL 182KBUILD_CFLAGS += $(call cc-option,-mpcrel) 183else 184KBUILD_CFLAGS += $(call cc-option,-mno-pcrel) 185endif 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 241 242generated_configs += ppc64le_defconfig 243ppc64le_defconfig: 244 $(call merge_into_defconfig,ppc64_defconfig,le) 245 246generated_configs += ppc64le_guest_defconfig 247ppc64le_guest_defconfig: 248 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest) 249 250generated_configs += ppc64_guest_defconfig 251ppc64_guest_defconfig: 252 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest) 253 254generated_configs += pseries_le_defconfig 255pseries_le_defconfig: ppc64le_guest_defconfig 256 257generated_configs += pseries_defconfig 258pseries_defconfig: ppc64le_guest_defconfig 259 260generated_configs += powernv_be_defconfig 261powernv_be_defconfig: 262 $(call merge_into_defconfig,powernv_defconfig,be) 263 264generated_configs += mpc85xx_defconfig 265mpc85xx_defconfig: 266 $(call merge_into_defconfig,mpc85xx_base.config,\ 267 85xx-32bit 85xx-hw fsl-emb-nonhw) 268 269generated_configs += mpc85xx_smp_defconfig 270mpc85xx_smp_defconfig: 271 $(call merge_into_defconfig,mpc85xx_base.config,\ 272 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw) 273 274generated_configs += corenet32_smp_defconfig 275corenet32_smp_defconfig: 276 $(call merge_into_defconfig,corenet_base.config,\ 277 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa) 278 279generated_configs += corenet64_smp_defconfig 280corenet64_smp_defconfig: 281 $(call merge_into_defconfig,corenet_base.config,\ 282 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa) 283 284generated_configs += mpc86xx_defconfig 285mpc86xx_defconfig: 286 $(call merge_into_defconfig,mpc86xx_base.config,\ 287 86xx-hw fsl-emb-nonhw) 288 289generated_configs += mpc86xx_smp_defconfig 290mpc86xx_smp_defconfig: 291 $(call merge_into_defconfig,mpc86xx_base.config,\ 292 86xx-smp 86xx-hw fsl-emb-nonhw) 293 294generated_configs += ppc32_allmodconfig 295ppc32_allmodconfig: 296 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \ 297 -f $(srctree)/Makefile allmodconfig 298 299generated_configs += ppc_defconfig 300ppc_defconfig: 301 $(call merge_into_defconfig,book3s_32.config,) 302 303generated_configs += ppc64le_allmodconfig 304ppc64le_allmodconfig: 305 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \ 306 -f $(srctree)/Makefile allmodconfig 307 308generated_configs += ppc64le_allnoconfig 309ppc64le_allnoconfig: 310 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \ 311 -f $(srctree)/Makefile allnoconfig 312 313generated_configs += ppc64_book3e_allmodconfig 314ppc64_book3e_allmodconfig: 315 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \ 316 -f $(srctree)/Makefile allmodconfig 317 318generated_configs += ppc32_randconfig 319ppc32_randconfig: 320 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \ 321 -f $(srctree)/Makefile randconfig 322 323generated_configs += ppc64_randconfig 324ppc64_randconfig: 325 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \ 326 -f $(srctree)/Makefile randconfig 327 328PHONY += $(generated_configs) 329 330define archhelp 331 echo '* zImage - Build default images selected by kernel config' 332 echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)' 333 echo ' uImage - U-Boot native image format' 334 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older' 335 echo ' versions which do not support device trees' 336 echo ' dtbImage.<dt> - zImage with an embedded device tree blob' 337 echo ' simpleImage.<dt> - Firmware independent image.' 338 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)' 339 echo ' install - Install kernel using' 340 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 341 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 342 echo ' install to $$(INSTALL_PATH) and run lilo' 343 echo ' *_defconfig - Select default config from arch/$(ARCH)/configs' 344 echo '' 345 echo ' Targets with <dt> embed a device tree blob inside the image' 346 echo ' These targets support board with firmware that does not' 347 echo ' support passing a device tree directly. Replace <dt> with the' 348 echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory' 349 echo ' (minus the .dts extension).' 350 echo 351 $(foreach cfg,$(generated_configs), 352 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));) 353endef 354 355PHONY += install 356install: 357 $(call cmd,install) 358 359ifeq ($(KBUILD_EXTMOD),) 360# We need to generate vdso-offsets.h before compiling certain files in kernel/. 361# In order to do that, we should use the archprepare target, but we can't since 362# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 363# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 364# Therefore we need to generate the header after prepare0 has been made, hence 365# this hack. 366prepare: vdso_prepare 367vdso_prepare: prepare0 368 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \ 369 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h) 370 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \ 371 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h) 372endif 373 374archprepare: checkbin 375 376archheaders: 377 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all 378 379ifdef CONFIG_STACKPROTECTOR 380prepare: stack_protector_prepare 381 382PHONY += stack_protector_prepare 383stack_protector_prepare: prepare0 384ifdef CONFIG_PPC64 385 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 \ 386 -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) 387else 388 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 \ 389 -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) 390endif 391endif 392 393PHONY += checkbin 394checkbin: 395 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \ 396 "x${CONFIG_LD_IS_BFD}" = "xy" -a \ 397 "${CONFIG_LD_VERSION}" = "23700" ; then \ 398 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \ 399 echo 'is unable to handle.' ; \ 400 echo '*** Please use a different binutils version.' ; \ 401 false ; \ 402 fi 403