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 := $(LDFLAGS_vmlinux-y)
105 ifndef CONFIG_PPC_KERNEL_PCREL
106 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
107 # -mcmodel=medium breaks modules because it uses 32bit offsets from
108 # the TOC pointer to create pointers where possible. Pointers into the
109 # percpu data area are created by this method.
111 # The kernel module loader relocates the percpu data section from the
112 # original location (starting with 0xd...) to somewhere in the base
113 # kernel percpu data space (starting with 0xc...). We need a full
114 # 64bit relocation for this to work, hence -mcmodel=large.
115 KBUILD_CFLAGS_MODULE += -mcmodel=large
117 export NO_MINIMAL_TOC := -mno-minimal-toc
122 CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
123 ifdef CONFIG_PPC64_ELF_ABI_V2
124 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
126 ifndef CONFIG_CC_IS_CLANG
127 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
128 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
131 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
132 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
133 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128)
135 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
136 # https://bugs.llvm.org/show_bug.cgi?id=39555
137 CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
139 # Clang doesn't support -mmultiple / -mno-multiple
140 # https://bugs.llvm.org/show_bug.cgi?id=39556
141 CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
143 CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
145 ifdef CONFIG_FUNCTION_TRACER
146 ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY
147 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
148 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
150 CC_FLAGS_FTRACE := -pg
151 ifdef CONFIG_MPROFILE_KERNEL
152 CC_FLAGS_FTRACE += -mprofile-kernel
157 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
158 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
160 CFLAGS-y += $(CONFIG_TUNE_CPU)
162 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
164 KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
165 KBUILD_AFLAGS += $(AFLAGS-y)
166 KBUILD_CFLAGS += $(call cc-option,-msoft-float)
167 KBUILD_CFLAGS += $(CFLAGS-y)
168 CPP = $(CC) -E $(KBUILD_CFLAGS)
170 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
171 ifdef CONFIG_CPU_BIG_ENDIAN
172 CHECKFLAGS += -D__BIG_ENDIAN__
174 CHECKFLAGS += -D__LITTLE_ENDIAN__
177 ifdef CONFIG_476FPE_ERR46
178 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
179 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
183 ifdef CONFIG_PPC_KERNEL_PREFIXED
184 KBUILD_CFLAGS += $(call cc-option,-mprefixed)
186 KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
188 ifdef CONFIG_PPC_KERNEL_PCREL
189 KBUILD_CFLAGS += $(call cc-option,-mpcrel)
191 KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
194 # No AltiVec or VSX or MMA instructions when building kernel
195 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
196 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
197 KBUILD_CFLAGS += $(call cc-option,-mno-mma)
199 # No SPE instruction when building kernel
200 # (We use all available options to help semi-broken compilers)
201 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
202 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
204 # Don't emit .eh_frame since we have no use for it
205 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
207 # Never use string load/store instructions as they are
208 # often slow when they are implemented at all
209 KBUILD_CFLAGS += $(call cc-option,-mno-string)
211 cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
213 # When using '-many -mpower4' gas will first try and find a matching power4
214 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
215 # about. GCC will pass -many to GAS when assembling, clang does not.
216 # LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
217 # but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
218 cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
220 KBUILD_AFLAGS += $(cpu-as-y)
221 KBUILD_CFLAGS += $(cpu-as-y)
223 KBUILD_AFLAGS += $(aflags-y)
224 KBUILD_CFLAGS += $(cflags-y)
226 # Default to zImage, override when needed
229 # With make 3.82 we cannot mix normal and wildcard targets
230 BOOT_TARGETS1 := zImage zImage.initrd uImage
231 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
233 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
235 boot := arch/$(ARCH)/boot
237 $(BOOT_TARGETS1): vmlinux
238 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
239 $(BOOT_TARGETS2): vmlinux
240 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
243 PHONY += bootwrapper_install
245 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
247 include $(srctree)/scripts/Makefile.defconf
249 generated_configs += ppc64le_defconfig
251 $(call merge_into_defconfig,ppc64_defconfig,le)
253 generated_configs += ppc64le_guest_defconfig
254 ppc64le_guest_defconfig:
255 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
257 generated_configs += ppc64_guest_defconfig
258 ppc64_guest_defconfig:
259 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
261 generated_configs += pseries_le_defconfig
262 pseries_le_defconfig: ppc64le_guest_defconfig
264 generated_configs += pseries_defconfig
265 pseries_defconfig: ppc64le_guest_defconfig
267 generated_configs += powernv_be_defconfig
268 powernv_be_defconfig:
269 $(call merge_into_defconfig,powernv_defconfig,be)
271 generated_configs += mpc85xx_defconfig
273 $(call merge_into_defconfig,mpc85xx_base.config,\
274 85xx-32bit 85xx-hw fsl-emb-nonhw)
276 generated_configs += 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 generated_configs += 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 generated_configs += 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 generated_configs += mpc86xx_defconfig
293 $(call merge_into_defconfig,mpc86xx_base.config,\
294 86xx-hw fsl-emb-nonhw)
296 generated_configs += mpc86xx_smp_defconfig
297 mpc86xx_smp_defconfig:
298 $(call merge_into_defconfig,mpc86xx_base.config,\
299 86xx-smp 86xx-hw fsl-emb-nonhw)
301 generated_configs += ppc32_allmodconfig
303 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
304 -f $(srctree)/Makefile allmodconfig
306 generated_configs += ppc_defconfig
308 $(call merge_into_defconfig,book3s_32.config,)
310 generated_configs += ppc64le_allmodconfig
311 ppc64le_allmodconfig:
312 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
313 -f $(srctree)/Makefile allmodconfig
315 generated_configs += ppc64le_allnoconfig
317 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
318 -f $(srctree)/Makefile allnoconfig
320 generated_configs += 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 generated_configs += ppc32_randconfig
327 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
328 -f $(srctree)/Makefile randconfig
330 generated_configs += ppc64_randconfig
332 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
333 -f $(srctree)/Makefile randconfig
335 PHONY += $(generated_configs)
338 echo '* zImage - Build default images selected by kernel config'
339 echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
340 echo ' uImage - U-Boot native image format'
341 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
342 echo ' versions which do not support device trees'
343 echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
344 echo ' simpleImage.<dt> - Firmware independent image.'
345 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
346 echo ' install - Install kernel using'
347 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
348 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
349 echo ' install to $$(INSTALL_PATH) and run lilo'
350 echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
352 echo ' Targets with <dt> embed a device tree blob inside the image'
353 echo ' These targets support board with firmware that does not'
354 echo ' support passing a device tree directly. Replace <dt> with the'
355 echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
356 echo ' (minus the .dts extension).'
358 $(foreach cfg,$(generated_configs),
359 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
366 ifeq ($(KBUILD_EXTMOD),)
367 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
368 # In order to do that, we should use the archprepare target, but we can't since
369 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
370 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
371 # Therefore we need to generate the header after prepare0 has been made, hence
373 prepare: vdso_prepare
374 vdso_prepare: prepare0
375 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
376 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
377 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
378 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
381 archprepare: checkbin
384 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
386 ifdef CONFIG_STACKPROTECTOR
387 prepare: stack_protector_prepare
389 PHONY += stack_protector_prepare
390 stack_protector_prepare: prepare0
392 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
394 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
400 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
401 "x${CONFIG_LD_IS_BFD}" = "xy" -a \
402 "${CONFIG_LD_VERSION}" = "23700" ; then \
403 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
404 echo 'is unable to handle.' ; \
405 echo '*** Please use a different binutils version.' ; \