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
152 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
154 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
155 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
157 else ifdef CONFIG_PPC_BOOK3E_64
158 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
161 ifdef CONFIG_FUNCTION_TRACER
162 CC_FLAGS_FTRACE := -pg
163 ifdef CONFIG_MPROFILE_KERNEL
164 CC_FLAGS_FTRACE += -mprofile-kernel
168 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
169 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
171 CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
172 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
174 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
176 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
177 KBUILD_AFLAGS += $(AFLAGS-y)
178 KBUILD_CFLAGS += $(call cc-option,-msoft-float)
179 KBUILD_CFLAGS += -pipe $(CFLAGS-y)
180 CPP = $(CC) -E $(KBUILD_CFLAGS)
182 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
183 ifdef CONFIG_CPU_BIG_ENDIAN
184 CHECKFLAGS += -D__BIG_ENDIAN__
186 CHECKFLAGS += -D__LITTLE_ENDIAN__
189 ifdef CONFIG_476FPE_ERR46
190 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
191 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
194 # No AltiVec or VSX instructions when building kernel
195 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
196 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
198 # No SPE instruction when building kernel
199 # (We use all available options to help semi-broken compilers)
200 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
201 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
203 # Don't emit .eh_frame since we have no use for it
204 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
206 # Never use string load/store instructions as they are
207 # often slow when they are implemented at all
208 KBUILD_CFLAGS += $(call cc-option,-mno-string)
210 cpu-as-$(CONFIG_40x) += -Wa,-m405
211 cpu-as-$(CONFIG_44x) += -Wa,-m440
212 cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
213 cpu-as-$(CONFIG_E500) += -Wa,-me500
215 # When using '-many -mpower4' gas will first try and find a matching power4
216 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
217 # about. GCC will pass -many to GAS when assembling, clang does not.
218 # LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
219 # but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
220 cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
221 cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc)
223 KBUILD_AFLAGS += $(cpu-as-y)
224 KBUILD_CFLAGS += $(cpu-as-y)
226 KBUILD_AFLAGS += $(aflags-y)
227 KBUILD_CFLAGS += $(cflags-y)
229 head-$(CONFIG_PPC64) := arch/powerpc/kernel/head_64.o
230 head-$(CONFIG_PPC_BOOK3S_32) := arch/powerpc/kernel/head_book3s_32.o
231 head-$(CONFIG_PPC_8xx) := arch/powerpc/kernel/head_8xx.o
232 head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
233 head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
234 head-$(CONFIG_FSL_BOOKE) := arch/powerpc/kernel/head_fsl_booke.o
236 head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
237 head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
238 head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
239 head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.o
241 # Default to zImage, override when needed
244 # With make 3.82 we cannot mix normal and wildcard targets
245 BOOT_TARGETS1 := zImage zImage.initrd uImage
246 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
248 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
250 boot := arch/$(ARCH)/boot
252 $(BOOT_TARGETS1): vmlinux
253 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
254 $(BOOT_TARGETS2): vmlinux
255 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
258 PHONY += bootwrapper_install
260 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
262 # Used to create 'merged defconfigs'
263 # To use it $(call) it with the first argument as the base defconfig
264 # and the second argument as a space separated list of .config files to merge,
265 # without the .config suffix.
266 define merge_into_defconfig
267 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
268 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
269 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
270 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
273 PHONY += pseries_le_defconfig
274 pseries_le_defconfig:
275 $(call merge_into_defconfig,pseries_defconfig,le)
277 PHONY += ppc64le_defconfig
279 $(call merge_into_defconfig,ppc64_defconfig,le)
281 PHONY += ppc64le_guest_defconfig
282 ppc64le_guest_defconfig:
283 $(call merge_into_defconfig,ppc64_defconfig,le guest)
285 PHONY += ppc64_guest_defconfig
286 ppc64_guest_defconfig:
287 $(call merge_into_defconfig,ppc64_defconfig,be guest)
289 PHONY += powernv_be_defconfig
290 powernv_be_defconfig:
291 $(call merge_into_defconfig,powernv_defconfig,be)
293 PHONY += mpc85xx_defconfig
295 $(call merge_into_defconfig,mpc85xx_base.config,\
296 85xx-32bit 85xx-hw fsl-emb-nonhw)
298 PHONY += mpc85xx_smp_defconfig
299 mpc85xx_smp_defconfig:
300 $(call merge_into_defconfig,mpc85xx_base.config,\
301 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
303 PHONY += corenet32_smp_defconfig
304 corenet32_smp_defconfig:
305 $(call merge_into_defconfig,corenet_base.config,\
306 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
308 PHONY += corenet64_smp_defconfig
309 corenet64_smp_defconfig:
310 $(call merge_into_defconfig,corenet_base.config,\
311 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
313 PHONY += mpc86xx_defconfig
315 $(call merge_into_defconfig,mpc86xx_base.config,\
316 86xx-hw fsl-emb-nonhw)
318 PHONY += mpc86xx_smp_defconfig
319 mpc86xx_smp_defconfig:
320 $(call merge_into_defconfig,mpc86xx_base.config,\
321 86xx-smp 86xx-hw fsl-emb-nonhw)
323 PHONY += ppc32_allmodconfig
325 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
326 -f $(srctree)/Makefile allmodconfig
328 PHONY += ppc_defconfig
330 $(call merge_into_defconfig,book3s_32.config,)
332 PHONY += ppc64le_allmodconfig
333 ppc64le_allmodconfig:
334 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
335 -f $(srctree)/Makefile allmodconfig
337 PHONY += ppc64le_allnoconfig
339 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
340 -f $(srctree)/Makefile allnoconfig
342 PHONY += ppc64_book3e_allmodconfig
343 ppc64_book3e_allmodconfig:
344 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
345 -f $(srctree)/Makefile allmodconfig
347 PHONY += ppc32_randconfig
349 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
350 -f $(srctree)/Makefile randconfig
352 PHONY += ppc64_randconfig
354 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
355 -f $(srctree)/Makefile randconfig
358 @echo '* zImage - Build default images selected by kernel config'
359 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
360 @echo ' uImage - U-Boot native image format'
361 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
362 @echo ' versions which do not support device trees'
363 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
364 @echo ' simpleImage.<dt> - Firmware independent image.'
365 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
366 @echo ' install - Install kernel using'
367 @echo ' (your) ~/bin/$(INSTALLKERNEL) or'
368 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
369 @echo ' install to $$(INSTALL_PATH) and run lilo'
370 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
372 @echo ' Targets with <dt> embed a device tree blob inside the image'
373 @echo ' These targets support board with firmware that does not'
374 @echo ' support passing a device tree directly. Replace <dt> with the'
375 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
376 @echo ' (minus the .dts extension).'
383 ifeq ($(KBUILD_EXTMOD),)
384 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
385 # In order to do that, we should use the archprepare target, but we can't since
386 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
387 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
388 # Therefore we need to generate the header after prepare0 has been made, hence
390 prepare: vdso_prepare
391 vdso_prepare: prepare0
392 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
393 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
394 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
395 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
398 archprepare: checkbin
401 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
403 ifdef CONFIG_STACKPROTECTOR
404 prepare: stack_protector_prepare
406 PHONY += stack_protector_prepare
407 stack_protector_prepare: prepare0
409 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
411 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
416 # Check toolchain versions:
417 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
419 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
420 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
421 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
422 echo 'in some circumstances.' ; \
423 echo '*** binutils 2.23 do not define the TOC symbol ' ; \
424 echo -n '*** Please use a different binutils version.' ; \