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 ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
46 # Have the linker provide sfpr if possible.
47 # There is a corresponding test in arch/powerpc/lib/Makefile
48 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
50 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
53 ifdef CONFIG_CPU_LITTLE_ENDIAN
54 KBUILD_CFLAGS += -mlittle-endian
57 GNUTARGET := powerpcle
58 MULTIPLEWORD := -mno-multiple
59 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
61 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
65 MULTIPLEWORD := -mmultiple
69 ifndef CONFIG_CC_IS_CLANG
70 cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
71 cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
72 aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
73 aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
77 ifndef CONFIG_CC_IS_CLANG
78 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
81 cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
82 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
83 aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
84 aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
86 ifeq ($(HAS_BIARCH),y)
87 KBUILD_CFLAGS += -m$(BITS)
88 KBUILD_AFLAGS += -m$(BITS)
89 KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
92 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
94 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
96 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
99 LDFLAGS_vmlinux-y := -Bstatic
100 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
101 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
102 LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
105 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
106 # -mcmodel=medium breaks modules because it uses 32bit offsets from
107 # the TOC pointer to create pointers where possible. Pointers into the
108 # percpu data area are created by this method.
110 # The kernel module loader relocates the percpu data section from the
111 # original location (starting with 0xd...) to somewhere in the base
112 # kernel percpu data space (starting with 0xc...). We need a full
113 # 64bit relocation for this to work, hence -mcmodel=large.
114 KBUILD_CFLAGS_MODULE += -mcmodel=large
116 export NO_MINIMAL_TOC := -mno-minimal-toc
120 CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
121 ifndef CONFIG_CC_IS_CLANG
122 ifdef CONFIG_PPC64_ELF_ABI_V2
123 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
124 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
126 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
127 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
128 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
131 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
132 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
134 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
135 # https://bugs.llvm.org/show_bug.cgi?id=39555
136 CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
138 # Clang doesn't support -mmultiple / -mno-multiple
139 # https://bugs.llvm.org/show_bug.cgi?id=39556
140 CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
142 CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
144 ifdef CONFIG_FUNCTION_TRACER
145 CC_FLAGS_FTRACE := -pg
146 ifdef CONFIG_MPROFILE_KERNEL
147 CC_FLAGS_FTRACE += -mprofile-kernel
151 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
152 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
154 CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \
155 $(call cc-option,-mtune=power9, \
156 $(call cc-option,-mtune=power8)))
158 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
160 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
161 KBUILD_AFLAGS += $(AFLAGS-y)
162 KBUILD_CFLAGS += $(call cc-option,-msoft-float)
163 KBUILD_CFLAGS += -pipe $(CFLAGS-y)
164 CPP = $(CC) -E $(KBUILD_CFLAGS)
166 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
167 ifdef CONFIG_CPU_BIG_ENDIAN
168 CHECKFLAGS += -D__BIG_ENDIAN__
170 CHECKFLAGS += -D__LITTLE_ENDIAN__
173 ifdef CONFIG_476FPE_ERR46
174 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
175 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
179 KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
180 KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
182 # No AltiVec or VSX or MMA instructions when building kernel
183 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
184 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
185 KBUILD_CFLAGS += $(call cc-option,-mno-mma)
187 # No SPE instruction when building kernel
188 # (We use all available options to help semi-broken compilers)
189 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
190 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
192 # Don't emit .eh_frame since we have no use for it
193 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
195 # Never use string load/store instructions as they are
196 # often slow when they are implemented at all
197 KBUILD_CFLAGS += $(call cc-option,-mno-string)
199 cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
201 # When using '-many -mpower4' gas will first try and find a matching power4
202 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
203 # about. GCC will pass -many to GAS when assembling, clang does not.
204 # LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
205 # but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
206 cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
208 KBUILD_AFLAGS += $(cpu-as-y)
209 KBUILD_CFLAGS += $(cpu-as-y)
211 KBUILD_AFLAGS += $(aflags-y)
212 KBUILD_CFLAGS += $(cflags-y)
214 # Default to zImage, override when needed
217 # With make 3.82 we cannot mix normal and wildcard targets
218 BOOT_TARGETS1 := zImage zImage.initrd uImage
219 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
221 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
223 boot := arch/$(ARCH)/boot
225 $(BOOT_TARGETS1): vmlinux
226 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
227 $(BOOT_TARGETS2): vmlinux
228 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
231 PHONY += bootwrapper_install
233 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
235 # Used to create 'merged defconfigs'
236 # To use it $(call) it with the first argument as the base defconfig
237 # and the second argument as a space separated list of .config files to merge,
238 # without the .config suffix.
239 define merge_into_defconfig
240 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
241 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
242 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
243 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
246 PHONY += pseries_le_defconfig
247 pseries_le_defconfig:
248 $(call merge_into_defconfig,pseries_defconfig,le)
250 PHONY += ppc64le_defconfig
252 $(call merge_into_defconfig,ppc64_defconfig,le)
254 PHONY += ppc64le_guest_defconfig
255 ppc64le_guest_defconfig:
256 $(call merge_into_defconfig,ppc64_defconfig,le guest)
258 PHONY += ppc64_guest_defconfig
259 ppc64_guest_defconfig:
260 $(call merge_into_defconfig,ppc64_defconfig,be guest)
262 PHONY += powernv_be_defconfig
263 powernv_be_defconfig:
264 $(call merge_into_defconfig,powernv_defconfig,be)
266 PHONY += mpc85xx_defconfig
268 $(call merge_into_defconfig,mpc85xx_base.config,\
269 85xx-32bit 85xx-hw fsl-emb-nonhw)
271 PHONY += mpc85xx_smp_defconfig
272 mpc85xx_smp_defconfig:
273 $(call merge_into_defconfig,mpc85xx_base.config,\
274 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
276 PHONY += corenet32_smp_defconfig
277 corenet32_smp_defconfig:
278 $(call merge_into_defconfig,corenet_base.config,\
279 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
281 PHONY += corenet64_smp_defconfig
282 corenet64_smp_defconfig:
283 $(call merge_into_defconfig,corenet_base.config,\
284 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
286 PHONY += mpc86xx_defconfig
288 $(call merge_into_defconfig,mpc86xx_base.config,\
289 86xx-hw fsl-emb-nonhw)
291 PHONY += mpc86xx_smp_defconfig
292 mpc86xx_smp_defconfig:
293 $(call merge_into_defconfig,mpc86xx_base.config,\
294 86xx-smp 86xx-hw fsl-emb-nonhw)
296 PHONY += ppc32_allmodconfig
298 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
299 -f $(srctree)/Makefile allmodconfig
301 PHONY += ppc_defconfig
303 $(call merge_into_defconfig,book3s_32.config,)
305 PHONY += ppc64le_allmodconfig
306 ppc64le_allmodconfig:
307 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
308 -f $(srctree)/Makefile allmodconfig
310 PHONY += ppc64le_allnoconfig
312 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
313 -f $(srctree)/Makefile allnoconfig
315 PHONY += ppc64_book3e_allmodconfig
316 ppc64_book3e_allmodconfig:
317 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
318 -f $(srctree)/Makefile allmodconfig
320 PHONY += ppc32_randconfig
322 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
323 -f $(srctree)/Makefile randconfig
325 PHONY += ppc64_randconfig
327 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
328 -f $(srctree)/Makefile randconfig
331 @echo '* zImage - Build default images selected by kernel config'
332 @echo ' zImage.* - Compressed kernel image (arch/$(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 $$(INSTALL_PATH) and run lilo'
343 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
345 @echo ' Targets with <dt> embed a device tree blob inside the image'
346 @echo ' These targets support board with firmware that does not'
347 @echo ' support passing a device tree directly. Replace <dt> with the'
348 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
349 @echo ' (minus the .dts extension).'
356 ifeq ($(KBUILD_EXTMOD),)
357 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
358 # In order to do that, we should use the archprepare target, but we can't since
359 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
360 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
361 # Therefore we need to generate the header after prepare0 has been made, hence
363 prepare: vdso_prepare
364 vdso_prepare: prepare0
365 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
366 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
367 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
368 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
371 archprepare: checkbin
374 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
376 ifdef CONFIG_STACKPROTECTOR
377 prepare: stack_protector_prepare
379 PHONY += stack_protector_prepare
380 stack_protector_prepare: prepare0
382 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
384 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
390 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
391 "x${CONFIG_LD_IS_BFD}" = "xy" -a \
392 "${CONFIG_LD_VERSION}" = "23700" ; then \
393 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
394 echo 'is unable to handle.' ; \
395 echo '*** Please use a different binutils version.' ; \