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 := $(LDFLAGS_vmlinux-y)
110 ifndef CONFIG_PPC_KERNEL_PCREL
111 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
112 # -mcmodel=medium breaks modules because it uses 32bit offsets from
113 # the TOC pointer to create pointers where possible. Pointers into the
114 # percpu data area are created by this method.
116 # The kernel module loader relocates the percpu data section from the
117 # original location (starting with 0xd...) to somewhere in the base
118 # kernel percpu data space (starting with 0xc...). We need a full
119 # 64bit relocation for this to work, hence -mcmodel=large.
120 KBUILD_CFLAGS_MODULE += -mcmodel=large
122 export NO_MINIMAL_TOC := -mno-minimal-toc
127 CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
128 ifdef CONFIG_PPC64_ELF_ABI_V2
129 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
131 ifndef CONFIG_CC_IS_CLANG
132 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
133 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
136 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
137 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
138 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128)
140 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
141 # https://bugs.llvm.org/show_bug.cgi?id=39555
142 CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
144 # Clang doesn't support -mmultiple / -mno-multiple
145 # https://bugs.llvm.org/show_bug.cgi?id=39556
146 CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
148 CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
150 ifdef CONFIG_FUNCTION_TRACER
151 CC_FLAGS_FTRACE := -pg
152 ifdef CONFIG_MPROFILE_KERNEL
153 CC_FLAGS_FTRACE += -mprofile-kernel
157 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
158 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
160 CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \
161 $(call cc-option,-mtune=power9, \
162 $(call cc-option,-mtune=power8)))
164 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
166 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
167 KBUILD_AFLAGS += $(AFLAGS-y)
168 KBUILD_CFLAGS += $(call cc-option,-msoft-float)
169 KBUILD_CFLAGS += -pipe $(CFLAGS-y)
170 CPP = $(CC) -E $(KBUILD_CFLAGS)
172 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
173 ifdef CONFIG_CPU_BIG_ENDIAN
174 CHECKFLAGS += -D__BIG_ENDIAN__
176 CHECKFLAGS += -D__LITTLE_ENDIAN__
179 ifdef CONFIG_476FPE_ERR46
180 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
181 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
185 ifdef CONFIG_PPC_KERNEL_PREFIXED
186 KBUILD_CFLAGS += $(call cc-option,-mprefixed)
188 KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
190 ifdef CONFIG_PPC_KERNEL_PCREL
191 KBUILD_CFLAGS += $(call cc-option,-mpcrel)
193 KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
196 # No AltiVec or VSX or MMA instructions when building kernel
197 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
198 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
199 KBUILD_CFLAGS += $(call cc-option,-mno-mma)
201 # No SPE instruction when building kernel
202 # (We use all available options to help semi-broken compilers)
203 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
204 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
206 # Don't emit .eh_frame since we have no use for it
207 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
209 # Never use string load/store instructions as they are
210 # often slow when they are implemented at all
211 KBUILD_CFLAGS += $(call cc-option,-mno-string)
213 cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
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)
222 KBUILD_AFLAGS += $(cpu-as-y)
223 KBUILD_CFLAGS += $(cpu-as-y)
225 KBUILD_AFLAGS += $(aflags-y)
226 KBUILD_CFLAGS += $(cflags-y)
228 # Default to zImage, override when needed
231 # With make 3.82 we cannot mix normal and wildcard targets
232 BOOT_TARGETS1 := zImage zImage.initrd uImage
233 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
235 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
237 boot := arch/$(ARCH)/boot
239 $(BOOT_TARGETS1): vmlinux
240 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
241 $(BOOT_TARGETS2): vmlinux
242 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
245 PHONY += bootwrapper_install
247 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
249 include $(srctree)/scripts/Makefile.defconf
251 generated_configs += ppc64le_defconfig
253 $(call merge_into_defconfig,ppc64_defconfig,le)
255 generated_configs += ppc64le_guest_defconfig
256 ppc64le_guest_defconfig:
257 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
259 generated_configs += ppc64_guest_defconfig
260 ppc64_guest_defconfig:
261 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
263 generated_configs += pseries_le_defconfig
264 pseries_le_defconfig: ppc64le_guest_defconfig
266 generated_configs += pseries_defconfig
267 pseries_defconfig: ppc64le_guest_defconfig
269 generated_configs += powernv_be_defconfig
270 powernv_be_defconfig:
271 $(call merge_into_defconfig,powernv_defconfig,be)
273 generated_configs += mpc85xx_defconfig
275 $(call merge_into_defconfig,mpc85xx_base.config,\
276 85xx-32bit 85xx-hw fsl-emb-nonhw)
278 generated_configs += mpc85xx_smp_defconfig
279 mpc85xx_smp_defconfig:
280 $(call merge_into_defconfig,mpc85xx_base.config,\
281 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
283 generated_configs += corenet32_smp_defconfig
284 corenet32_smp_defconfig:
285 $(call merge_into_defconfig,corenet_base.config,\
286 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
288 generated_configs += corenet64_smp_defconfig
289 corenet64_smp_defconfig:
290 $(call merge_into_defconfig,corenet_base.config,\
291 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
293 generated_configs += mpc86xx_defconfig
295 $(call merge_into_defconfig,mpc86xx_base.config,\
296 86xx-hw fsl-emb-nonhw)
298 generated_configs += mpc86xx_smp_defconfig
299 mpc86xx_smp_defconfig:
300 $(call merge_into_defconfig,mpc86xx_base.config,\
301 86xx-smp 86xx-hw fsl-emb-nonhw)
303 generated_configs += ppc32_allmodconfig
305 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
306 -f $(srctree)/Makefile allmodconfig
308 generated_configs += ppc_defconfig
310 $(call merge_into_defconfig,book3s_32.config,)
312 generated_configs += ppc64le_allmodconfig
313 ppc64le_allmodconfig:
314 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
315 -f $(srctree)/Makefile allmodconfig
317 generated_configs += ppc64le_allnoconfig
319 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
320 -f $(srctree)/Makefile allnoconfig
322 generated_configs += ppc64_book3e_allmodconfig
323 ppc64_book3e_allmodconfig:
324 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
325 -f $(srctree)/Makefile allmodconfig
327 generated_configs += ppc32_randconfig
329 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
330 -f $(srctree)/Makefile randconfig
332 generated_configs += ppc64_randconfig
334 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
335 -f $(srctree)/Makefile randconfig
337 PHONY += $(generated_configs)
340 echo '* zImage - Build default images selected by kernel config'
341 echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
342 echo ' uImage - U-Boot native image format'
343 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
344 echo ' versions which do not support device trees'
345 echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
346 echo ' simpleImage.<dt> - Firmware independent image.'
347 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
348 echo ' install - Install kernel using'
349 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
350 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
351 echo ' install to $$(INSTALL_PATH) and run lilo'
352 echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
354 echo ' Targets with <dt> embed a device tree blob inside the image'
355 echo ' These targets support board with firmware that does not'
356 echo ' support passing a device tree directly. Replace <dt> with the'
357 echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
358 echo ' (minus the .dts extension).'
360 $(foreach cfg,$(generated_configs),
361 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
368 ifeq ($(KBUILD_EXTMOD),)
369 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
370 # In order to do that, we should use the archprepare target, but we can't since
371 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
372 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
373 # Therefore we need to generate the header after prepare0 has been made, hence
375 prepare: vdso_prepare
376 vdso_prepare: prepare0
377 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
378 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
379 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
380 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
383 archprepare: checkbin
386 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
388 ifdef CONFIG_STACKPROTECTOR
389 prepare: stack_protector_prepare
391 PHONY += stack_protector_prepare
392 stack_protector_prepare: prepare0
394 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
396 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
401 # Check toolchain versions:
402 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
404 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
405 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
406 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
407 echo 'in some circumstances.' ; \
408 echo '*** binutils 2.23 do not define the TOC symbol ' ; \
409 echo -n '*** Please use a different binutils version.' ; \