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1# This file is included by the global makefile so that you can add your own
2# architecture-specific flags and dependencies.
3#
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
6# for more details.
7#
8# Copyright (C) 1994 by Linus Torvalds
9# Changes for PPC by Gary Thomas
10# Rewritten by Cort Dougan and Paul Mackerras
11#
12
13ifdef cross_compiling
14 ifeq ($(CROSS_COMPILE),)
15 # Auto detect cross compiler prefix.
16 # Look for: (powerpc(64(le)?)?)(-unknown)?-linux(-gnu)?-
17 CC_ARCHES := powerpc powerpc64 powerpc64le
18 CC_SUFFIXES := linux linux-gnu unknown-linux-gnu
19 CROSS_COMPILE := $(call cc-cross-prefix, $(foreach a,$(CC_ARCHES), \
20 $(foreach s,$(CC_SUFFIXES),$(a)-$(s)-)))
21 endif
22endif
23
24HAS_BIARCH := $(call cc-option-yn, -m32)
25
26# Set default 32 bits cross compilers for vdso and boot wrapper
27CROSS32_COMPILE ?=
28
29# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
30# ppc64le_defconfig because we have nothing better to go on.
31uname := $(shell uname -m)
32KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64le)_defconfig
33
34new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
35
36ifeq ($(new_nm),y)
37NM := $(NM) --synthetic
38endif
39
40# BITS is used as extension for files which are available in a 32 bit
41# and a 64 bit version to simplify shared Makefiles.
42# e.g.: obj-y += foo_$(BITS).o
43export BITS
44
45ifdef CONFIG_PPC64
46 BITS := 64
47else
48 BITS := 32
49endif
50
51machine-y = ppc
52machine-$(CONFIG_PPC64) += 64
53machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
54UTS_MACHINE := $(subst $(space),,$(machine-y))
55
56ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
57# Have the linker provide sfpr if possible.
58# There is a corresponding test in arch/powerpc/lib/Makefile
59KBUILD_LDFLAGS_MODULE += --save-restore-funcs
60else
61KBUILD_LDFLAGS_MODULE += $(objtree)/arch/powerpc/lib/crtsavres.o
62endif
63
64ifdef CONFIG_PPC64
65KBUILD_RUSTFLAGS += --target=powerpc64le-unknown-linux-gnu
66KBUILD_RUSTFLAGS += -Ctarget-feature=-mma,-vsx,-hard-float,-altivec
67else
68KBUILD_RUSTFLAGS += --target=powerpc-unknown-linux-gnu
69endif
70
71ifdef CONFIG_CPU_LITTLE_ENDIAN
72KBUILD_CPPFLAGS += -mlittle-endian
73KBUILD_LDFLAGS += -EL
74LDEMULATION := lppc
75GNUTARGET := powerpcle
76MULTIPLEWORD := -mno-multiple
77KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
78else
79KBUILD_CPPFLAGS += $(call cc-option,-mbig-endian)
80KBUILD_LDFLAGS += -EB
81LDEMULATION := ppc
82GNUTARGET := powerpc
83MULTIPLEWORD := -mmultiple
84endif
85
86ifdef CONFIG_PPC64
87ifndef CONFIG_CC_IS_CLANG
88cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
89cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
90aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
91aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
92endif
93endif
94
95ifndef CONFIG_CC_IS_CLANG
96 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
97endif
98
99cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
100cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
101aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
102aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
103
104ifeq ($(HAS_BIARCH),y)
105KBUILD_CPPFLAGS += -m$(BITS)
106KBUILD_AFLAGS += -m$(BITS)
107KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
108endif
109
110LDFLAGS_vmlinux-y := -Bstatic
111LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie --no-dynamic-linker
112LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
113LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
114
115ifdef CONFIG_PPC64
116ifndef CONFIG_PPC_KERNEL_PCREL
117 # -mcmodel=medium breaks modules because it uses 32bit offsets from
118 # the TOC pointer to create pointers where possible. Pointers into the
119 # percpu data area are created by this method.
120 #
121 # The kernel module loader relocates the percpu data section from the
122 # original location (starting with 0xd...) to somewhere in the base
123 # kernel percpu data space (starting with 0xc...). We need a full
124 # 64bit relocation for this to work, hence -mcmodel=large.
125 KBUILD_CFLAGS_MODULE += -mcmodel=large
126endif
127endif
128
129CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
130ifdef CONFIG_PPC64_ELF_ABI_V2
131CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
132else
133ifndef CONFIG_CC_IS_CLANG
134CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
135CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
136endif
137endif
138CFLAGS-$(CONFIG_PPC64) += -mcmodel=medium
139CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
140CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128)
141
142# Clang unconditionally reserves r2 on ppc32 and does not support the flag
143# https://llvm.org/pr39555
144CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
145
146# Clang doesn't support -mmultiple / -mno-multiple
147# https://llvm.org/pr39556
148CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
149
150CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
151
152CC_FLAGS_FPU := $(call cc-option,-mhard-float)
153CC_FLAGS_NO_FPU := $(call cc-option,-msoft-float)
154
155ifdef CONFIG_FUNCTION_TRACER
156ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY
157KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
158ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE
159CC_FLAGS_FTRACE := -fpatchable-function-entry=1
160else
161ifdef CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS # PPC32 only
162CC_FLAGS_FTRACE := -fpatchable-function-entry=3,1
163else
164CC_FLAGS_FTRACE := -fpatchable-function-entry=2
165endif
166endif
167else
168CC_FLAGS_FTRACE := -pg
169ifdef CONFIG_MPROFILE_KERNEL
170CC_FLAGS_FTRACE += -mprofile-kernel
171endif
172endif
173endif
174
175CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
176AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
177
178CFLAGS-y += $(CONFIG_TUNE_CPU)
179
180asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
181
182KBUILD_CPPFLAGS += -I $(srctree)/arch/powerpc $(asinstr)
183KBUILD_AFLAGS += $(AFLAGS-y)
184KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU)
185KBUILD_CFLAGS += $(CFLAGS-y)
186
187CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
188ifdef CONFIG_CPU_BIG_ENDIAN
189CHECKFLAGS += -D__BIG_ENDIAN__
190else
191CHECKFLAGS += -D__LITTLE_ENDIAN__
192endif
193
194ifdef CONFIG_476FPE_ERR46
195 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
196 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
197endif
198
199# No prefix or pcrel
200ifdef CONFIG_PPC_KERNEL_PREFIXED
201KBUILD_CFLAGS += $(call cc-option,-mprefixed)
202else
203KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
204endif
205ifdef CONFIG_PPC_KERNEL_PCREL
206KBUILD_CFLAGS += $(call cc-option,-mpcrel)
207else
208KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
209endif
210
211# No AltiVec or VSX or MMA instructions when building kernel
212KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
213KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
214KBUILD_CFLAGS += $(call cc-option,-mno-mma)
215
216# No SPE instruction when building kernel
217# (We use all available options to help semi-broken compilers)
218KBUILD_CFLAGS += $(call cc-option,-mno-spe)
219KBUILD_CFLAGS += $(call cc-option,-mspe=no)
220
221# Don't emit .eh_frame since we have no use for it
222KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
223
224# Never use string load/store instructions as they are
225# often slow when they are implemented at all
226KBUILD_CFLAGS += $(call cc-option,-mno-string)
227
228KBUILD_AFLAGS += $(aflags-y)
229KBUILD_CFLAGS += $(cflags-y)
230
231# Default to zImage, override when needed
232all: zImage
233
234# With make 3.82 we cannot mix normal and wildcard targets
235BOOT_TARGETS1 := zImage zImage.initrd uImage
236BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
237
238PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
239
240boot := arch/powerpc/boot
241
242$(BOOT_TARGETS1): vmlinux
243 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
244$(BOOT_TARGETS2): vmlinux
245 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
246
247
248PHONY += bootwrapper_install
249bootwrapper_install:
250 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
251
252include $(srctree)/scripts/Makefile.defconf
253
254generated_configs += ppc64le_defconfig
255ppc64le_defconfig:
256 $(call merge_into_defconfig,ppc64_defconfig,le)
257
258generated_configs += ppc64le_guest_defconfig
259ppc64le_guest_defconfig:
260 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
261
262generated_configs += ppc64_guest_defconfig
263ppc64_guest_defconfig:
264 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
265
266generated_configs += pseries_le_defconfig
267pseries_le_defconfig: ppc64le_guest_defconfig
268
269generated_configs += pseries_defconfig
270pseries_defconfig: ppc64le_guest_defconfig
271
272generated_configs += powernv_be_defconfig
273powernv_be_defconfig:
274 $(call merge_into_defconfig,powernv_defconfig,be)
275
276generated_configs += mpc85xx_defconfig
277mpc85xx_defconfig:
278 $(call merge_into_defconfig,mpc85xx_base.config,\
279 85xx-32bit 85xx-hw fsl-emb-nonhw)
280
281generated_configs += mpc85xx_smp_defconfig
282mpc85xx_smp_defconfig:
283 $(call merge_into_defconfig,mpc85xx_base.config,\
284 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
285
286generated_configs += corenet32_smp_defconfig
287corenet32_smp_defconfig:
288 $(call merge_into_defconfig,corenet_base.config,\
289 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
290
291generated_configs += corenet64_smp_defconfig
292corenet64_smp_defconfig:
293 $(call merge_into_defconfig,corenet_base.config,\
294 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
295
296generated_configs += mpc86xx_defconfig
297mpc86xx_defconfig:
298 $(call merge_into_defconfig,mpc86xx_base.config,\
299 86xx-hw fsl-emb-nonhw)
300
301generated_configs += mpc86xx_smp_defconfig
302mpc86xx_smp_defconfig:
303 $(call merge_into_defconfig,mpc86xx_base.config,\
304 86xx-smp 86xx-hw fsl-emb-nonhw)
305
306generated_configs += ppc32_allmodconfig
307ppc32_allmodconfig:
308 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
309 -f $(srctree)/Makefile allmodconfig
310
311generated_configs += ppc44x_allmodconfig
312ppc44x_allmodconfig:
313 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/44x.config \
314 -f $(srctree)/Makefile allmodconfig
315
316generated_configs += ppc8xx_allmodconfig
317ppc8xx_allmodconfig:
318 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/8xx.config \
319 -f $(srctree)/Makefile allmodconfig
320
321generated_configs += ppc85xx_allmodconfig
322ppc85xx_allmodconfig:
323 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-32bit.config \
324 -f $(srctree)/Makefile allmodconfig
325
326generated_configs += ppc_defconfig
327ppc_defconfig:
328 $(call merge_into_defconfig,book3s_32.config,)
329
330generated_configs += ppc64le_allmodconfig
331ppc64le_allmodconfig:
332 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
333 -f $(srctree)/Makefile allmodconfig
334
335generated_configs += ppc64le_allnoconfig
336ppc64le_allnoconfig:
337 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
338 -f $(srctree)/Makefile allnoconfig
339
340generated_configs += ppc64_book3e_allmodconfig
341ppc64_book3e_allmodconfig:
342 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
343 -f $(srctree)/Makefile allmodconfig
344
345generated_configs += ppc32_randconfig
346ppc32_randconfig:
347 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
348 -f $(srctree)/Makefile randconfig
349
350generated_configs += ppc64_randconfig
351ppc64_randconfig:
352 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
353 -f $(srctree)/Makefile randconfig
354
355PHONY += $(generated_configs)
356
357define archhelp
358 echo '* zImage - Build default images selected by kernel config'
359 echo ' zImage.* - Compressed kernel image (arch/powerpc/boot/zImage.*)'
360 echo ' uImage - U-Boot native image format'
361 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
362 echo ' versions which do not support device trees'
363 echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
364 echo ' simpleImage.<dt> - Firmware independent image.'
365 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
366 echo ' install - Install kernel using'
367 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
368 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
369 echo ' install to $$(INSTALL_PATH)'
370 echo ' *_defconfig - Select default config from arch/powerpc/configs'
371 echo ''
372 echo ' Targets with <dt> embed a device tree blob inside the image'
373 echo ' These targets support board with firmware that does not'
374 echo ' support passing a device tree directly. Replace <dt> with the'
375 echo ' name of a dts file from the arch/powerpc/boot/dts/ directory'
376 echo ' (minus the .dts extension).'
377 echo
378 $(foreach cfg,$(generated_configs),
379 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
380endef
381
382PHONY += install
383install:
384 $(call cmd,install)
385
386ifeq ($(KBUILD_EXTMOD),)
387# We need to generate vdso-offsets.h before compiling certain files in kernel/.
388# In order to do that, we should use the archprepare target, but we can't since
389# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
390# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
391# Therefore we need to generate the header after prepare0 has been made, hence
392# this hack.
393prepare: vdso_prepare
394vdso_prepare: prepare0
395 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
396 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
397 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
398 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
399endif
400
401archprepare: checkbin
402
403archheaders:
404 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
405
406ifdef CONFIG_STACKPROTECTOR
407prepare: stack_protector_prepare
408
409PHONY += stack_protector_prepare
410stack_protector_prepare: prepare0
411ifdef CONFIG_PPC64
412 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 \
413 -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' \
414 $(objtree)/include/generated/asm-offsets.h))
415else
416 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 \
417 -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' \
418 $(objtree)/include/generated/asm-offsets.h))
419endif
420endif
421
422PHONY += checkbin
423checkbin:
424 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
425 "x${CONFIG_LD_IS_BFD}" = "xy" -a \
426 "${CONFIG_LD_VERSION}" = "23700" ; then \
427 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
428 echo 'is unable to handle.' ; \
429 echo '*** Please use a different binutils version.' ; \
430 false ; \
431 fi