1 # This file is included by the global makefile so that you can add your own
2 # architecture-specific flags and dependencies.
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
8 # Copyright (C) 1994 by Linus Torvalds
9 # Changes for PPC by Gary Thomas
10 # Rewritten by Cort Dougan and Paul Mackerras
13 HAS_BIARCH := $(call cc-option-yn, -m32)
15 # Set default 32 bits cross compilers for vdso and boot wrapper
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.
20 uname := $(shell uname -m)
21 KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
23 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
26 NM := $(NM) --synthetic
29 # BITS is used as extension for files which are available in a 32 bit
30 # and a 64 bit version to simplify shared Makefiles.
31 # e.g.: obj-y += foo_$(BITS).o
41 machine-$(CONFIG_PPC64) += 64
42 machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
43 UTS_MACHINE := $(subst $(space),,$(machine-y))
45 # XXX This needs to be before we override LD below
47 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
49 ifeq ($(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
52 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
54 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
58 ifdef CONFIG_CPU_LITTLE_ENDIAN
59 KBUILD_CFLAGS += -mlittle-endian
62 GNUTARGET := powerpcle
63 MULTIPLEWORD := -mno-multiple
64 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
66 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
70 MULTIPLEWORD := -mmultiple
74 ifndef CONFIG_CC_IS_CLANG
75 cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
76 cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
77 aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
78 aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
82 ifndef CONFIG_CC_IS_CLANG
83 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
86 cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
87 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
88 aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
89 aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
91 ifeq ($(HAS_BIARCH),y)
92 KBUILD_CFLAGS += -m$(BITS)
93 KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
94 KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
97 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
99 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
101 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
104 LDFLAGS_vmlinux-y := -Bstatic
105 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
106 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
107 LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
110 ifeq ($(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.
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
121 export NO_MINIMAL_TOC := -mno-minimal-toc
125 CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
126 ifndef CONFIG_CC_IS_CLANG
127 ifdef CONFIG_PPC64_ELF_ABI_V2
128 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
129 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
131 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
132 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
133 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
136 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
137 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
139 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
140 # https://bugs.llvm.org/show_bug.cgi?id=39555
141 CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
143 # Clang doesn't support -mmultiple / -mno-multiple
144 # https://bugs.llvm.org/show_bug.cgi?id=39556
145 CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
147 CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
149 ifdef CONFIG_PPC_BOOK3S_64
150 ifdef CONFIG_CPU_LITTLE_ENDIAN
151 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
153 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power4
155 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power10, \
156 $(call cc-option,-mtune=power9, \
157 $(call cc-option,-mtune=power8)))
158 else ifdef CONFIG_PPC_BOOK3E_64
159 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
162 ifdef CONFIG_FUNCTION_TRACER
163 CC_FLAGS_FTRACE := -pg
164 ifdef CONFIG_MPROFILE_KERNEL
165 CC_FLAGS_FTRACE += -mprofile-kernel
169 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
170 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
172 CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
173 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
175 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
177 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
178 KBUILD_AFLAGS += $(AFLAGS-y)
179 KBUILD_CFLAGS += $(call cc-option,-msoft-float)
180 KBUILD_CFLAGS += -pipe $(CFLAGS-y)
181 CPP = $(CC) -E $(KBUILD_CFLAGS)
183 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
184 ifdef CONFIG_CPU_BIG_ENDIAN
185 CHECKFLAGS += -D__BIG_ENDIAN__
187 CHECKFLAGS += -D__LITTLE_ENDIAN__
190 ifdef CONFIG_476FPE_ERR46
191 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
192 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
196 KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
197 KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
199 # No AltiVec or VSX or MMA instructions when building kernel
200 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
201 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
202 KBUILD_CFLAGS += $(call cc-option,-mno-mma)
204 # No SPE instruction when building kernel
205 # (We use all available options to help semi-broken compilers)
206 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
207 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
209 # Don't emit .eh_frame since we have no use for it
210 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
212 # Never use string load/store instructions as they are
213 # often slow when they are implemented at all
214 KBUILD_CFLAGS += $(call cc-option,-mno-string)
216 cpu-as-$(CONFIG_40x) += -Wa,-m405
217 cpu-as-$(CONFIG_44x) += -Wa,-m440
218 cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
219 cpu-as-$(CONFIG_PPC_E500) += -Wa,-me500
221 # When using '-many -mpower4' gas will first try and find a matching power4
222 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
223 # about. GCC will pass -many to GAS when assembling, clang does not.
224 # LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
225 # but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
226 cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
227 cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc)
229 KBUILD_AFLAGS += $(cpu-as-y)
230 KBUILD_CFLAGS += $(cpu-as-y)
232 KBUILD_AFLAGS += $(aflags-y)
233 KBUILD_CFLAGS += $(cflags-y)
235 head-$(CONFIG_PPC64) := arch/powerpc/kernel/head_64.o
236 head-$(CONFIG_PPC_BOOK3S_32) := arch/powerpc/kernel/head_book3s_32.o
237 head-$(CONFIG_PPC_8xx) := arch/powerpc/kernel/head_8xx.o
238 head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
239 head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
240 head-$(CONFIG_PPC_85xx) := arch/powerpc/kernel/head_85xx.o
242 head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
243 head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
244 head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
245 head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.o
247 # Default to zImage, override when needed
250 # With make 3.82 we cannot mix normal and wildcard targets
251 BOOT_TARGETS1 := zImage zImage.initrd uImage
252 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
254 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
256 boot := arch/$(ARCH)/boot
258 $(BOOT_TARGETS1): vmlinux
259 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
260 $(BOOT_TARGETS2): vmlinux
261 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
264 PHONY += bootwrapper_install
266 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
268 # Used to create 'merged defconfigs'
269 # To use it $(call) it with the first argument as the base defconfig
270 # and the second argument as a space separated list of .config files to merge,
271 # without the .config suffix.
272 define merge_into_defconfig
273 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
274 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
275 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
276 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
279 PHONY += pseries_le_defconfig
280 pseries_le_defconfig:
281 $(call merge_into_defconfig,pseries_defconfig,le)
283 PHONY += ppc64le_defconfig
285 $(call merge_into_defconfig,ppc64_defconfig,le)
287 PHONY += ppc64le_guest_defconfig
288 ppc64le_guest_defconfig:
289 $(call merge_into_defconfig,ppc64_defconfig,le guest)
291 PHONY += ppc64_guest_defconfig
292 ppc64_guest_defconfig:
293 $(call merge_into_defconfig,ppc64_defconfig,be guest)
295 PHONY += powernv_be_defconfig
296 powernv_be_defconfig:
297 $(call merge_into_defconfig,powernv_defconfig,be)
299 PHONY += mpc85xx_defconfig
301 $(call merge_into_defconfig,mpc85xx_base.config,\
302 85xx-32bit 85xx-hw fsl-emb-nonhw)
304 PHONY += mpc85xx_smp_defconfig
305 mpc85xx_smp_defconfig:
306 $(call merge_into_defconfig,mpc85xx_base.config,\
307 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
309 PHONY += corenet32_smp_defconfig
310 corenet32_smp_defconfig:
311 $(call merge_into_defconfig,corenet_base.config,\
312 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
314 PHONY += corenet64_smp_defconfig
315 corenet64_smp_defconfig:
316 $(call merge_into_defconfig,corenet_base.config,\
317 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
319 PHONY += mpc86xx_defconfig
321 $(call merge_into_defconfig,mpc86xx_base.config,\
322 86xx-hw fsl-emb-nonhw)
324 PHONY += mpc86xx_smp_defconfig
325 mpc86xx_smp_defconfig:
326 $(call merge_into_defconfig,mpc86xx_base.config,\
327 86xx-smp 86xx-hw fsl-emb-nonhw)
329 PHONY += ppc32_allmodconfig
331 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
332 -f $(srctree)/Makefile allmodconfig
334 PHONY += ppc_defconfig
336 $(call merge_into_defconfig,book3s_32.config,)
338 PHONY += ppc64le_allmodconfig
339 ppc64le_allmodconfig:
340 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
341 -f $(srctree)/Makefile allmodconfig
343 PHONY += ppc64le_allnoconfig
345 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
346 -f $(srctree)/Makefile allnoconfig
348 PHONY += ppc64_book3e_allmodconfig
349 ppc64_book3e_allmodconfig:
350 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
351 -f $(srctree)/Makefile allmodconfig
353 PHONY += ppc32_randconfig
355 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
356 -f $(srctree)/Makefile randconfig
358 PHONY += ppc64_randconfig
360 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
361 -f $(srctree)/Makefile randconfig
364 @echo '* zImage - Build default images selected by kernel config'
365 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
366 @echo ' uImage - U-Boot native image format'
367 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
368 @echo ' versions which do not support device trees'
369 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
370 @echo ' simpleImage.<dt> - Firmware independent image.'
371 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
372 @echo ' install - Install kernel using'
373 @echo ' (your) ~/bin/$(INSTALLKERNEL) or'
374 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
375 @echo ' install to $$(INSTALL_PATH) and run lilo'
376 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
378 @echo ' Targets with <dt> embed a device tree blob inside the image'
379 @echo ' These targets support board with firmware that does not'
380 @echo ' support passing a device tree directly. Replace <dt> with the'
381 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
382 @echo ' (minus the .dts extension).'
389 ifeq ($(KBUILD_EXTMOD),)
390 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
391 # In order to do that, we should use the archprepare target, but we can't since
392 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
393 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
394 # Therefore we need to generate the header after prepare0 has been made, hence
396 prepare: vdso_prepare
397 vdso_prepare: prepare0
398 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
399 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
400 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
401 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
404 archprepare: checkbin
407 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
409 ifdef CONFIG_STACKPROTECTOR
410 prepare: stack_protector_prepare
412 PHONY += stack_protector_prepare
413 stack_protector_prepare: prepare0
415 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
417 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
422 # Check toolchain versions:
423 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
425 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
426 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
427 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
428 echo 'in some circumstances.' ; \
429 echo '*** binutils 2.23 do not define the TOC symbol ' ; \
430 echo -n '*** Please use a different binutils version.' ; \