tjh.dev
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$(BITS)
94KBUILD_LDFLAGS += -m elf$(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 := $(LDFLAGS_vmlinux-y)
108
109ifdef CONFIG_PPC64
110ifndef CONFIG_PPC_KERNEL_PCREL
111ifeq ($(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.
115 #
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
121else
122 export NO_MINIMAL_TOC := -mno-minimal-toc
123endif
124endif
125endif
126
127CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
128ifdef CONFIG_PPC64_ELF_ABI_V2
129CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
130else
131ifndef CONFIG_CC_IS_CLANG
132CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
133CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
134endif
135endif
136CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
137CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
138CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128)
139
140# Clang unconditionally reserves r2 on ppc32 and does not support the flag
141# https://bugs.llvm.org/show_bug.cgi?id=39555
142CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
143
144# Clang doesn't support -mmultiple / -mno-multiple
145# https://bugs.llvm.org/show_bug.cgi?id=39556
146CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
147
148CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
149
150ifdef CONFIG_FUNCTION_TRACER
151CC_FLAGS_FTRACE := -pg
152ifdef CONFIG_MPROFILE_KERNEL
153CC_FLAGS_FTRACE += -mprofile-kernel
154endif
155endif
156
157CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
158AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
159
160CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \
161 $(call cc-option,-mtune=power9, \
162 $(call cc-option,-mtune=power8)))
163
164asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
165
166KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
167KBUILD_AFLAGS += $(AFLAGS-y)
168KBUILD_CFLAGS += $(call cc-option,-msoft-float)
169KBUILD_CFLAGS += -pipe $(CFLAGS-y)
170CPP = $(CC) -E $(KBUILD_CFLAGS)
171
172CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
173ifdef CONFIG_CPU_BIG_ENDIAN
174CHECKFLAGS += -D__BIG_ENDIAN__
175else
176CHECKFLAGS += -D__LITTLE_ENDIAN__
177endif
178
179ifdef CONFIG_476FPE_ERR46
180 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
181 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
182endif
183
184# No prefix or pcrel
185ifdef CONFIG_PPC_KERNEL_PREFIXED
186KBUILD_CFLAGS += $(call cc-option,-mprefixed)
187else
188KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
189endif
190ifdef CONFIG_PPC_KERNEL_PCREL
191KBUILD_CFLAGS += $(call cc-option,-mpcrel)
192else
193KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
194endif
195
196# No AltiVec or VSX or MMA instructions when building kernel
197KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
198KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
199KBUILD_CFLAGS += $(call cc-option,-mno-mma)
200
201# No SPE instruction when building kernel
202# (We use all available options to help semi-broken compilers)
203KBUILD_CFLAGS += $(call cc-option,-mno-spe)
204KBUILD_CFLAGS += $(call cc-option,-mspe=no)
205
206# Don't emit .eh_frame since we have no use for it
207KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
208
209# Never use string load/store instructions as they are
210# often slow when they are implemented at all
211KBUILD_CFLAGS += $(call cc-option,-mno-string)
212
213cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
214
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...
220cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
221
222KBUILD_AFLAGS += $(cpu-as-y)
223KBUILD_CFLAGS += $(cpu-as-y)
224
225KBUILD_AFLAGS += $(aflags-y)
226KBUILD_CFLAGS += $(cflags-y)
227
228# Default to zImage, override when needed
229all: zImage
230
231# With make 3.82 we cannot mix normal and wildcard targets
232BOOT_TARGETS1 := zImage zImage.initrd uImage
233BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
234
235PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
236
237boot := arch/$(ARCH)/boot
238
239$(BOOT_TARGETS1): vmlinux
240 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
241$(BOOT_TARGETS2): vmlinux
242 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
243
244
245PHONY += bootwrapper_install
246bootwrapper_install:
247 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
248
249include $(srctree)/scripts/Makefile.defconf
250
251generated_configs += ppc64le_defconfig
252ppc64le_defconfig:
253 $(call merge_into_defconfig,ppc64_defconfig,le)
254
255generated_configs += ppc64le_guest_defconfig
256ppc64le_guest_defconfig:
257 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
258
259generated_configs += ppc64_guest_defconfig
260ppc64_guest_defconfig:
261 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
262
263generated_configs += pseries_le_defconfig
264pseries_le_defconfig: ppc64le_guest_defconfig
265
266generated_configs += pseries_defconfig
267pseries_defconfig: ppc64le_guest_defconfig
268
269generated_configs += powernv_be_defconfig
270powernv_be_defconfig:
271 $(call merge_into_defconfig,powernv_defconfig,be)
272
273generated_configs += mpc85xx_defconfig
274mpc85xx_defconfig:
275 $(call merge_into_defconfig,mpc85xx_base.config,\
276 85xx-32bit 85xx-hw fsl-emb-nonhw)
277
278generated_configs += mpc85xx_smp_defconfig
279mpc85xx_smp_defconfig:
280 $(call merge_into_defconfig,mpc85xx_base.config,\
281 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
282
283generated_configs += corenet32_smp_defconfig
284corenet32_smp_defconfig:
285 $(call merge_into_defconfig,corenet_base.config,\
286 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
287
288generated_configs += corenet64_smp_defconfig
289corenet64_smp_defconfig:
290 $(call merge_into_defconfig,corenet_base.config,\
291 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
292
293generated_configs += mpc86xx_defconfig
294mpc86xx_defconfig:
295 $(call merge_into_defconfig,mpc86xx_base.config,\
296 86xx-hw fsl-emb-nonhw)
297
298generated_configs += mpc86xx_smp_defconfig
299mpc86xx_smp_defconfig:
300 $(call merge_into_defconfig,mpc86xx_base.config,\
301 86xx-smp 86xx-hw fsl-emb-nonhw)
302
303generated_configs += ppc32_allmodconfig
304ppc32_allmodconfig:
305 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
306 -f $(srctree)/Makefile allmodconfig
307
308generated_configs += ppc_defconfig
309ppc_defconfig:
310 $(call merge_into_defconfig,book3s_32.config,)
311
312generated_configs += ppc64le_allmodconfig
313ppc64le_allmodconfig:
314 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
315 -f $(srctree)/Makefile allmodconfig
316
317generated_configs += ppc64le_allnoconfig
318ppc64le_allnoconfig:
319 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
320 -f $(srctree)/Makefile allnoconfig
321
322generated_configs += ppc64_book3e_allmodconfig
323ppc64_book3e_allmodconfig:
324 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
325 -f $(srctree)/Makefile allmodconfig
326
327generated_configs += ppc32_randconfig
328ppc32_randconfig:
329 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
330 -f $(srctree)/Makefile randconfig
331
332generated_configs += ppc64_randconfig
333ppc64_randconfig:
334 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
335 -f $(srctree)/Makefile randconfig
336
337PHONY += $(generated_configs)
338
339define archhelp
340 echo '* zImage - Build default images selected by kernel config'
341 echo ' zImage.* - Compressed kernel image (arch/$(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 $$(INSTALL_PATH) and run lilo'
352 echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
353 echo ''
354 echo ' Targets with <dt> embed a device tree blob inside the image'
355 echo ' These targets support board with firmware that does not'
356 echo ' support passing a device tree directly. Replace <dt> with the'
357 echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
358 echo ' (minus the .dts extension).'
359 echo
360 $(foreach cfg,$(generated_configs),
361 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
362endef
363
364PHONY += install
365install:
366 $(call cmd,install)
367
368ifeq ($(KBUILD_EXTMOD),)
369# We need to generate vdso-offsets.h before compiling certain files in kernel/.
370# In order to do that, we should use the archprepare target, but we can't since
371# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
372# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
373# Therefore we need to generate the header after prepare0 has been made, hence
374# this hack.
375prepare: vdso_prepare
376vdso_prepare: prepare0
377 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
378 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
379 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
380 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
381endif
382
383archprepare: checkbin
384
385archheaders:
386 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
387
388ifdef CONFIG_STACKPROTECTOR
389prepare: stack_protector_prepare
390
391PHONY += stack_protector_prepare
392stack_protector_prepare: prepare0
393ifdef CONFIG_PPC64
394 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
395else
396 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
397endif
398endif
399
400PHONY += checkbin
401# Check toolchain versions:
402# - gcc-4.6 is the minimum kernel-wide version so nothing required.
403checkbin:
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.' ; \
410 false ; \
411 fi