Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
13HAS_BIARCH := $(call cc-option-yn, -m32)
14
15# Set default 32 bits cross compilers for vdso and boot wrapper
16CROSS32_COMPILE ?=
17
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.
20uname := $(shell uname -m)
21KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
22
23new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
24
25ifeq ($(new_nm),y)
26NM := $(NM) --synthetic
27endif
28
29# BITS is used as extension for files which are available in a 32 bit
30# and a 64 bit version to simplify shared Makefiles.
31# e.g.: obj-y += foo_$(BITS).o
32export BITS
33
34ifdef CONFIG_PPC64
35 BITS := 64
36else
37 BITS := 32
38endif
39
40machine-y = ppc
41machine-$(CONFIG_PPC64) += 64
42machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
43UTS_MACHINE := $(subst $(space),,$(machine-y))
44
45# XXX This needs to be before we override LD below
46ifdef CONFIG_PPC32
47KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
48else
49ifeq ($(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
52KBUILD_LDFLAGS_MODULE += --save-restore-funcs
53else
54KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
55endif
56endif
57
58ifdef CONFIG_CPU_LITTLE_ENDIAN
59KBUILD_CFLAGS += -mlittle-endian
60KBUILD_LDFLAGS += -EL
61LDEMULATION := lppc
62GNUTARGET := powerpcle
63MULTIPLEWORD := -mno-multiple
64KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
65else
66KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
67KBUILD_LDFLAGS += -EB
68LDEMULATION := ppc
69GNUTARGET := powerpc
70MULTIPLEWORD := -mmultiple
71endif
72
73ifdef CONFIG_PPC64
74ifndef CONFIG_CC_IS_CLANG
75cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
76cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
77aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
78aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
79endif
80endif
81
82ifndef CONFIG_CC_IS_CLANG
83 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
84endif
85
86cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
87cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
88aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
89aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
90
91ifeq ($(HAS_BIARCH),y)
92KBUILD_CFLAGS += -m$(BITS)
93KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
94KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
95endif
96
97cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
98ifdef CONFIG_PPC64
99cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
100else
101cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
102endif
103
104LDFLAGS_vmlinux-y := -Bstatic
105LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
106LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
107LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
108
109ifdef CONFIG_PPC64
110ifeq ($(call cc-option-yn,-mcmodel=medium),y)
111 # -mcmodel=medium breaks modules because it uses 32bit offsets from
112 # the TOC pointer to create pointers where possible. Pointers into the
113 # percpu data area are created by this method.
114 #
115 # The kernel module loader relocates the percpu data section from the
116 # original location (starting with 0xd...) to somewhere in the base
117 # kernel percpu data space (starting with 0xc...). We need a full
118 # 64bit relocation for this to work, hence -mcmodel=large.
119 KBUILD_CFLAGS_MODULE += -mcmodel=large
120else
121 export NO_MINIMAL_TOC := -mno-minimal-toc
122endif
123endif
124
125CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
126ifndef CONFIG_CC_IS_CLANG
127ifdef CONFIG_PPC64_ELF_ABI_V2
128CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
129AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
130else
131CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
132CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
133AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
134endif
135endif
136CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
137CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
138
139# Clang unconditionally reserves r2 on ppc32 and does not support the flag
140# https://bugs.llvm.org/show_bug.cgi?id=39555
141CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
142
143# Clang doesn't support -mmultiple / -mno-multiple
144# https://bugs.llvm.org/show_bug.cgi?id=39556
145CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
146
147CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
148
149ifdef CONFIG_PPC_BOOK3S_64
150ifdef CONFIG_CPU_LITTLE_ENDIAN
151CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
152else
153CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power4
154endif
155CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power10, \
156 $(call cc-option,-mtune=power9, \
157 $(call cc-option,-mtune=power8)))
158else ifdef CONFIG_PPC_BOOK3E_64
159CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
160endif
161
162ifdef CONFIG_FUNCTION_TRACER
163CC_FLAGS_FTRACE := -pg
164ifdef CONFIG_MPROFILE_KERNEL
165CC_FLAGS_FTRACE += -mprofile-kernel
166endif
167endif
168
169CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
170AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
171
172CFLAGS-$(CONFIG_E5500_CPU) += $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
173CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
174
175asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
176
177KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
178KBUILD_AFLAGS += $(AFLAGS-y)
179KBUILD_CFLAGS += $(call cc-option,-msoft-float)
180KBUILD_CFLAGS += -pipe $(CFLAGS-y)
181CPP = $(CC) -E $(KBUILD_CFLAGS)
182
183CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
184ifdef CONFIG_CPU_BIG_ENDIAN
185CHECKFLAGS += -D__BIG_ENDIAN__
186else
187CHECKFLAGS += -D__LITTLE_ENDIAN__
188endif
189
190ifdef CONFIG_476FPE_ERR46
191 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
192 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
193endif
194
195# No prefix or pcrel
196KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
197KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
198
199# No AltiVec or VSX or MMA instructions when building kernel
200KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
201KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
202KBUILD_CFLAGS += $(call cc-option,-mno-mma)
203
204# No SPE instruction when building kernel
205# (We use all available options to help semi-broken compilers)
206KBUILD_CFLAGS += $(call cc-option,-mno-spe)
207KBUILD_CFLAGS += $(call cc-option,-mspe=no)
208
209# Don't emit .eh_frame since we have no use for it
210KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
211
212# Never use string load/store instructions as they are
213# often slow when they are implemented at all
214KBUILD_CFLAGS += $(call cc-option,-mno-string)
215
216cpu-as-$(CONFIG_40x) += -Wa,-m405
217cpu-as-$(CONFIG_44x) += -Wa,-m440
218cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
219cpu-as-$(CONFIG_PPC_E500) += -Wa,-me500
220
221# When using '-many -mpower4' gas will first try and find a matching power4
222# mnemonic and failing that it will allow any valid mnemonic that GAS knows
223# about. GCC will pass -many to GAS when assembling, clang does not.
224# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
225# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
226cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
227cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc)
228
229KBUILD_AFLAGS += $(cpu-as-y)
230KBUILD_CFLAGS += $(cpu-as-y)
231
232KBUILD_AFLAGS += $(aflags-y)
233KBUILD_CFLAGS += $(cflags-y)
234
235# Default to zImage, override when needed
236all: zImage
237
238# With make 3.82 we cannot mix normal and wildcard targets
239BOOT_TARGETS1 := zImage zImage.initrd uImage
240BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
241
242PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
243
244boot := arch/$(ARCH)/boot
245
246$(BOOT_TARGETS1): vmlinux
247 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
248$(BOOT_TARGETS2): vmlinux
249 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
250
251
252PHONY += bootwrapper_install
253bootwrapper_install:
254 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
255
256# Used to create 'merged defconfigs'
257# To use it $(call) it with the first argument as the base defconfig
258# and the second argument as a space separated list of .config files to merge,
259# without the .config suffix.
260define merge_into_defconfig
261 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
262 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
263 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
264 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
265endef
266
267PHONY += pseries_le_defconfig
268pseries_le_defconfig:
269 $(call merge_into_defconfig,pseries_defconfig,le)
270
271PHONY += ppc64le_defconfig
272ppc64le_defconfig:
273 $(call merge_into_defconfig,ppc64_defconfig,le)
274
275PHONY += ppc64le_guest_defconfig
276ppc64le_guest_defconfig:
277 $(call merge_into_defconfig,ppc64_defconfig,le guest)
278
279PHONY += ppc64_guest_defconfig
280ppc64_guest_defconfig:
281 $(call merge_into_defconfig,ppc64_defconfig,be guest)
282
283PHONY += powernv_be_defconfig
284powernv_be_defconfig:
285 $(call merge_into_defconfig,powernv_defconfig,be)
286
287PHONY += mpc85xx_defconfig
288mpc85xx_defconfig:
289 $(call merge_into_defconfig,mpc85xx_base.config,\
290 85xx-32bit 85xx-hw fsl-emb-nonhw)
291
292PHONY += mpc85xx_smp_defconfig
293mpc85xx_smp_defconfig:
294 $(call merge_into_defconfig,mpc85xx_base.config,\
295 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
296
297PHONY += corenet32_smp_defconfig
298corenet32_smp_defconfig:
299 $(call merge_into_defconfig,corenet_base.config,\
300 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
301
302PHONY += corenet64_smp_defconfig
303corenet64_smp_defconfig:
304 $(call merge_into_defconfig,corenet_base.config,\
305 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
306
307PHONY += mpc86xx_defconfig
308mpc86xx_defconfig:
309 $(call merge_into_defconfig,mpc86xx_base.config,\
310 86xx-hw fsl-emb-nonhw)
311
312PHONY += mpc86xx_smp_defconfig
313mpc86xx_smp_defconfig:
314 $(call merge_into_defconfig,mpc86xx_base.config,\
315 86xx-smp 86xx-hw fsl-emb-nonhw)
316
317PHONY += ppc32_allmodconfig
318ppc32_allmodconfig:
319 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
320 -f $(srctree)/Makefile allmodconfig
321
322PHONY += ppc_defconfig
323ppc_defconfig:
324 $(call merge_into_defconfig,book3s_32.config,)
325
326PHONY += ppc64le_allmodconfig
327ppc64le_allmodconfig:
328 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
329 -f $(srctree)/Makefile allmodconfig
330
331PHONY += ppc64le_allnoconfig
332ppc64le_allnoconfig:
333 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
334 -f $(srctree)/Makefile allnoconfig
335
336PHONY += ppc64_book3e_allmodconfig
337ppc64_book3e_allmodconfig:
338 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
339 -f $(srctree)/Makefile allmodconfig
340
341PHONY += ppc32_randconfig
342ppc32_randconfig:
343 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
344 -f $(srctree)/Makefile randconfig
345
346PHONY += ppc64_randconfig
347ppc64_randconfig:
348 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
349 -f $(srctree)/Makefile randconfig
350
351define archhelp
352 @echo '* zImage - Build default images selected by kernel config'
353 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
354 @echo ' uImage - U-Boot native image format'
355 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
356 @echo ' versions which do not support device trees'
357 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
358 @echo ' simpleImage.<dt> - Firmware independent image.'
359 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
360 @echo ' install - Install kernel using'
361 @echo ' (your) ~/bin/$(INSTALLKERNEL) or'
362 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
363 @echo ' install to $$(INSTALL_PATH) and run lilo'
364 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
365 @echo ''
366 @echo ' Targets with <dt> embed a device tree blob inside the image'
367 @echo ' These targets support board with firmware that does not'
368 @echo ' support passing a device tree directly. Replace <dt> with the'
369 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
370 @echo ' (minus the .dts extension).'
371endef
372
373PHONY += install
374install:
375 $(call cmd,install)
376
377ifeq ($(KBUILD_EXTMOD),)
378# We need to generate vdso-offsets.h before compiling certain files in kernel/.
379# In order to do that, we should use the archprepare target, but we can't since
380# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
381# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
382# Therefore we need to generate the header after prepare0 has been made, hence
383# this hack.
384prepare: vdso_prepare
385vdso_prepare: prepare0
386 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
387 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
388 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
389 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
390endif
391
392archprepare: checkbin
393
394archheaders:
395 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
396
397ifdef CONFIG_STACKPROTECTOR
398prepare: stack_protector_prepare
399
400PHONY += stack_protector_prepare
401stack_protector_prepare: prepare0
402ifdef CONFIG_PPC64
403 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
404else
405 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
406endif
407endif
408
409PHONY += checkbin
410# Check toolchain versions:
411# - gcc-4.6 is the minimum kernel-wide version so nothing required.
412checkbin:
413 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
414 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
415 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
416 echo 'in some circumstances.' ; \
417 echo '*** binutils 2.23 do not define the TOC symbol ' ; \
418 echo -n '*** Please use a different binutils version.' ; \
419 false ; \
420 fi