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