1 # This file is included by the global makefile so that you can add your own
2 # architecture-specific flags and dependencies. Remember to do have actions
3 # for "archclean" and "archdep" for cleaning up and making dependencies for
6 # This file is subject to the terms and conditions of the GNU General Public
7 # License. See the file "COPYING" in the main directory of this archive
10 # Copyright (C) 1994 by Linus Torvalds
11 # Changes for PPC by Gary Thomas
12 # Rewritten by Cort Dougan and Paul Mackerras
15 HAS_BIARCH := $(call cc-option-yn, -m32)
17 # Set default 32 bits cross compilers for vdso and boot wrapper
20 ifeq ($(HAS_BIARCH),y)
21 ifeq ($(CROSS32_COMPILE),)
23 # These options will be overridden by any -mcpu option that the CPU
24 # or platform code sets later on the command line, but they are needed
25 # to set a sane 32-bit cpu target for the 64-bit cross compiler which
26 # may default to the wrong ISA.
27 KBUILD_CFLAGS += -mcpu=powerpc
28 KBUILD_AFLAGS += -mcpu=powerpc
33 ifdef CONFIG_PPC_BOOK3S_32
34 KBUILD_CFLAGS += -mcpu=powerpc
37 # If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
38 # ppc64_defconfig because we have nothing better to go on.
39 uname := $(shell uname -m)
40 KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
42 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
45 NM := $(NM) --synthetic
48 # BITS is used as extension for files which are available in a 32 bit
49 # and a 64 bit version to simplify shared Makefiles.
50 # e.g.: obj-y += foo_$(BITS).o
60 machine-$(CONFIG_PPC64) += 64
61 machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
62 UTS_MACHINE := $(subst $(space),,$(machine-y))
64 # XXX This needs to be before we override LD below
66 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
68 ifeq ($(call ld-ifversion, -ge, 22500, y),y)
69 # Have the linker provide sfpr if possible.
70 # There is a corresponding test in arch/powerpc/lib/Makefile
71 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
73 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
77 ifdef CONFIG_CPU_LITTLE_ENDIAN
78 KBUILD_CFLAGS += -mlittle-endian
81 GNUTARGET := powerpcle
82 MULTIPLEWORD := -mno-multiple
83 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
85 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
89 MULTIPLEWORD := -mmultiple
93 ifndef CONFIG_CC_IS_CLANG
94 cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
95 cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mcall-aixdesc)
96 aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
97 aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
101 ifndef CONFIG_CC_IS_CLANG
102 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
105 cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
106 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
107 aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
108 aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
110 ifeq ($(HAS_BIARCH),y)
111 KBUILD_CFLAGS += -m$(BITS)
112 KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
113 KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
116 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
118 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
120 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
123 LDFLAGS_vmlinux-y := -Bstatic
124 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
125 LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
128 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
129 # -mcmodel=medium breaks modules because it uses 32bit offsets from
130 # the TOC pointer to create pointers where possible. Pointers into the
131 # percpu data area are created by this method.
133 # The kernel module loader relocates the percpu data section from the
134 # original location (starting with 0xd...) to somewhere in the base
135 # kernel percpu data space (starting with 0xc...). We need a full
136 # 64bit relocation for this to work, hence -mcmodel=large.
137 KBUILD_CFLAGS_MODULE += -mcmodel=large
139 export NO_MINIMAL_TOC := -mno-minimal-toc
143 CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
144 ifndef CONFIG_CC_IS_CLANG
145 ifdef CONFIG_CPU_LITTLE_ENDIAN
146 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
147 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
149 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
150 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
151 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
154 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
155 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
157 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
158 # https://bugs.llvm.org/show_bug.cgi?id=39555
159 CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
161 # Clang doesn't support -mmultiple / -mno-multiple
162 # https://bugs.llvm.org/show_bug.cgi?id=39556
163 CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
165 CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
167 ifdef CONFIG_PPC_BOOK3S_64
168 ifdef CONFIG_CPU_LITTLE_ENDIAN
169 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
170 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
172 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
173 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
176 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
179 ifdef CONFIG_FUNCTION_TRACER
180 CC_FLAGS_FTRACE := -pg
181 ifdef CONFIG_MPROFILE_KERNEL
182 CC_FLAGS_FTRACE += -mprofile-kernel
184 # Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
185 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
186 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
187 ifndef CONFIG_CC_IS_CLANG
188 CC_FLAGS_FTRACE += $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
192 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
194 # Altivec option not allowed with e500mc64 in GCC.
196 E5500_CPU := -mcpu=powerpc64
198 E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
200 CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
201 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
204 ifdef CONFIG_PPC_E500MC
205 CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
207 CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
211 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
213 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
214 KBUILD_AFLAGS += $(AFLAGS-y)
215 KBUILD_CFLAGS += $(call cc-option,-msoft-float)
216 KBUILD_CFLAGS += -pipe $(CFLAGS-y)
217 CPP = $(CC) -E $(KBUILD_CFLAGS)
219 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
220 ifdef CONFIG_CPU_BIG_ENDIAN
221 CHECKFLAGS += -D__BIG_ENDIAN__
223 CHECKFLAGS += -D__LITTLE_ENDIAN__
226 ifdef CONFIG_476FPE_ERR46
227 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
228 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
231 # No AltiVec or VSX instructions when building kernel
232 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
233 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
235 # No SPE instruction when building kernel
236 # (We use all available options to help semi-broken compilers)
237 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
238 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
240 # Don't emit .eh_frame since we have no use for it
241 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
243 # Never use string load/store instructions as they are
244 # often slow when they are implemented at all
245 KBUILD_CFLAGS += $(call cc-option,-mno-string)
247 cpu-as-$(CONFIG_40x) += -Wa,-m405
248 cpu-as-$(CONFIG_44x) += -Wa,-m440
249 cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
250 cpu-as-$(CONFIG_E500) += -Wa,-me500
252 # When using '-many -mpower4' gas will first try and find a matching power4
253 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
254 # about. GCC will pass -many to GAS when assembling, clang does not.
255 cpu-as-$(CONFIG_PPC_BOOK3S_64) += -Wa,-mpower4 -Wa,-many
256 cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc)
258 KBUILD_AFLAGS += $(cpu-as-y)
259 KBUILD_CFLAGS += $(cpu-as-y)
261 KBUILD_AFLAGS += $(aflags-y)
262 KBUILD_CFLAGS += $(cflags-y)
264 head-$(CONFIG_PPC64) := arch/powerpc/kernel/head_64.o
265 head-$(CONFIG_PPC_BOOK3S_32) := arch/powerpc/kernel/head_book3s_32.o
266 head-$(CONFIG_PPC_8xx) := arch/powerpc/kernel/head_8xx.o
267 head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
268 head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
269 head-$(CONFIG_FSL_BOOKE) := arch/powerpc/kernel/head_fsl_booke.o
271 head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
272 head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
273 head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
274 head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.o
276 # See arch/powerpc/Kbuild for content of core part of the kernel
277 core-y += arch/powerpc/
279 # Default to zImage, override when needed
282 # With make 3.82 we cannot mix normal and wildcard targets
283 BOOT_TARGETS1 := zImage zImage.initrd uImage
284 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
286 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
288 boot := arch/$(ARCH)/boot
290 $(BOOT_TARGETS1): vmlinux
291 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
292 $(BOOT_TARGETS2): vmlinux
293 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
296 PHONY += bootwrapper_install
298 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
300 # Used to create 'merged defconfigs'
301 # To use it $(call) it with the first argument as the base defconfig
302 # and the second argument as a space separated list of .config files to merge,
303 # without the .config suffix.
304 define merge_into_defconfig
305 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
306 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
307 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
308 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
311 PHONY += pseries_le_defconfig
312 pseries_le_defconfig:
313 $(call merge_into_defconfig,pseries_defconfig,le)
315 PHONY += ppc64le_defconfig
317 $(call merge_into_defconfig,ppc64_defconfig,le)
319 PHONY += ppc64le_guest_defconfig
320 ppc64le_guest_defconfig:
321 $(call merge_into_defconfig,ppc64_defconfig,le guest)
323 PHONY += ppc64_guest_defconfig
324 ppc64_guest_defconfig:
325 $(call merge_into_defconfig,ppc64_defconfig,be guest)
327 PHONY += powernv_be_defconfig
328 powernv_be_defconfig:
329 $(call merge_into_defconfig,powernv_defconfig,be)
331 PHONY += mpc85xx_defconfig
333 $(call merge_into_defconfig,mpc85xx_base.config,\
334 85xx-32bit 85xx-hw fsl-emb-nonhw)
336 PHONY += mpc85xx_smp_defconfig
337 mpc85xx_smp_defconfig:
338 $(call merge_into_defconfig,mpc85xx_base.config,\
339 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
341 PHONY += corenet32_smp_defconfig
342 corenet32_smp_defconfig:
343 $(call merge_into_defconfig,corenet_base.config,\
344 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
346 PHONY += corenet64_smp_defconfig
347 corenet64_smp_defconfig:
348 $(call merge_into_defconfig,corenet_base.config,\
349 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
351 PHONY += mpc86xx_defconfig
353 $(call merge_into_defconfig,mpc86xx_base.config,\
354 86xx-hw fsl-emb-nonhw)
356 PHONY += mpc86xx_smp_defconfig
357 mpc86xx_smp_defconfig:
358 $(call merge_into_defconfig,mpc86xx_base.config,\
359 86xx-smp 86xx-hw fsl-emb-nonhw)
361 PHONY += ppc32_allmodconfig
363 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
364 -f $(srctree)/Makefile allmodconfig
366 PHONY += ppc_defconfig
368 $(call merge_into_defconfig,book3s_32.config,)
370 PHONY += ppc64le_allmodconfig
371 ppc64le_allmodconfig:
372 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
373 -f $(srctree)/Makefile allmodconfig
375 PHONY += ppc64le_allnoconfig
377 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
378 -f $(srctree)/Makefile allnoconfig
380 PHONY += ppc64_book3e_allmodconfig
381 ppc64_book3e_allmodconfig:
382 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
383 -f $(srctree)/Makefile allmodconfig
386 @echo '* zImage - Build default images selected by kernel config'
387 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
388 @echo ' uImage - U-Boot native image format'
389 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
390 @echo ' versions which do not support device trees'
391 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
392 @echo ' simpleImage.<dt> - Firmware independent image.'
393 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
394 @echo ' install - Install kernel using'
395 @echo ' (your) ~/bin/$(INSTALLKERNEL) or'
396 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
397 @echo ' install to $$(INSTALL_PATH) and run lilo'
398 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
400 @echo ' Targets with <dt> embed a device tree blob inside the image'
401 @echo ' These targets support board with firmware that does not'
402 @echo ' support passing a device tree directly. Replace <dt> with the'
403 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
404 @echo ' (minus the .dts extension).'
409 $(Q)$(MAKE) $(build)=$(boot) install
412 $(Q)$(MAKE) $(clean)=$(boot)
414 ifeq ($(KBUILD_EXTMOD),)
415 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
416 # In order to do that, we should use the archprepare target, but we can't since
417 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
418 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
419 # Therefore we need to generate the header after prepare0 has been made, hence
421 prepare: vdso_prepare
422 vdso_prepare: prepare0
423 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
424 $(build)=arch/powerpc/kernel/vdso32 include/generated/vdso32-offsets.h)
425 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
426 $(build)=arch/powerpc/kernel/vdso64 include/generated/vdso64-offsets.h)
429 archprepare: checkbin
432 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
434 ifdef CONFIG_STACKPROTECTOR
435 prepare: stack_protector_prepare
437 PHONY += stack_protector_prepare
438 stack_protector_prepare: prepare0
440 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
442 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
447 prepare: task_cpu_prepare
449 PHONY += task_cpu_prepare
450 task_cpu_prepare: prepare0
451 $(eval KBUILD_CFLAGS += -D_TASK_CPU=$(shell awk '{if ($$2 == "TASK_CPU") print $$3;}' include/generated/asm-offsets.h))
455 # Check toolchain versions:
456 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
458 @if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
459 && $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
460 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
461 echo 'in some circumstances.' ; \
462 echo -n '*** Please use a different binutils version.' ; \