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
45ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
46# Have the linker provide sfpr if possible.
47# There is a corresponding test in arch/powerpc/lib/Makefile
48KBUILD_LDFLAGS_MODULE += --save-restore-funcs
49else
50KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
51endif
52
53ifdef CONFIG_CPU_LITTLE_ENDIAN
54KBUILD_CFLAGS += -mlittle-endian
55KBUILD_LDFLAGS += -EL
56LDEMULATION := lppc
57GNUTARGET := powerpcle
58MULTIPLEWORD := -mno-multiple
59KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
60else
61KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
62KBUILD_LDFLAGS += -EB
63LDEMULATION := ppc
64GNUTARGET := powerpc
65MULTIPLEWORD := -mmultiple
66endif
67
68ifdef CONFIG_PPC64
69ifndef CONFIG_CC_IS_CLANG
70cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
71cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
72aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
73aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
74endif
75endif
76
77ifndef CONFIG_CC_IS_CLANG
78 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
79endif
80
81cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
82cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
83aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
84aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
85
86ifeq ($(HAS_BIARCH),y)
87KBUILD_CFLAGS += -m$(BITS)
88KBUILD_AFLAGS += -m$(BITS)
89KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
90endif
91
92cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
93ifdef CONFIG_PPC64
94cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
95else
96cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
97endif
98
99LDFLAGS_vmlinux-y := -Bstatic
100LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
101LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
102LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
103
104ifdef CONFIG_PPC64
105ifndef CONFIG_PPC_KERNEL_PCREL
106ifeq ($(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.
110 #
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
116else
117 export NO_MINIMAL_TOC := -mno-minimal-toc
118endif
119endif
120endif
121
122CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
123ifdef CONFIG_PPC64_ELF_ABI_V2
124CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
125else
126ifndef CONFIG_CC_IS_CLANG
127CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
128CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
129endif
130endif
131CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
132CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
133CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128)
134
135# Clang unconditionally reserves r2 on ppc32 and does not support the flag
136# https://bugs.llvm.org/show_bug.cgi?id=39555
137CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
138
139# Clang doesn't support -mmultiple / -mno-multiple
140# https://bugs.llvm.org/show_bug.cgi?id=39556
141CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
142
143CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
144
145ifdef CONFIG_FUNCTION_TRACER
146CC_FLAGS_FTRACE := -pg
147ifdef CONFIG_MPROFILE_KERNEL
148CC_FLAGS_FTRACE += -mprofile-kernel
149endif
150endif
151
152CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
153AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
154
155CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \
156 $(call cc-option,-mtune=power9, \
157 $(call cc-option,-mtune=power8)))
158
159asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
160
161KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
162KBUILD_AFLAGS += $(AFLAGS-y)
163KBUILD_CFLAGS += $(call cc-option,-msoft-float)
164KBUILD_CFLAGS += $(CFLAGS-y)
165CPP = $(CC) -E $(KBUILD_CFLAGS)
166
167CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
168ifdef CONFIG_CPU_BIG_ENDIAN
169CHECKFLAGS += -D__BIG_ENDIAN__
170else
171CHECKFLAGS += -D__LITTLE_ENDIAN__
172endif
173
174ifdef CONFIG_476FPE_ERR46
175 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
176 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
177endif
178
179# No prefix or pcrel
180ifdef CONFIG_PPC_KERNEL_PREFIXED
181KBUILD_CFLAGS += $(call cc-option,-mprefixed)
182else
183KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
184endif
185ifdef CONFIG_PPC_KERNEL_PCREL
186KBUILD_CFLAGS += $(call cc-option,-mpcrel)
187else
188KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
189endif
190
191# No AltiVec or VSX or MMA instructions when building kernel
192KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
193KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
194KBUILD_CFLAGS += $(call cc-option,-mno-mma)
195
196# No SPE instruction when building kernel
197# (We use all available options to help semi-broken compilers)
198KBUILD_CFLAGS += $(call cc-option,-mno-spe)
199KBUILD_CFLAGS += $(call cc-option,-mspe=no)
200
201# Don't emit .eh_frame since we have no use for it
202KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
203
204# Never use string load/store instructions as they are
205# often slow when they are implemented at all
206KBUILD_CFLAGS += $(call cc-option,-mno-string)
207
208cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
209
210# When using '-many -mpower4' gas will first try and find a matching power4
211# mnemonic and failing that it will allow any valid mnemonic that GAS knows
212# about. GCC will pass -many to GAS when assembling, clang does not.
213# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
214# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
215cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
216
217KBUILD_AFLAGS += $(cpu-as-y)
218KBUILD_CFLAGS += $(cpu-as-y)
219
220KBUILD_AFLAGS += $(aflags-y)
221KBUILD_CFLAGS += $(cflags-y)
222
223# Default to zImage, override when needed
224all: zImage
225
226# With make 3.82 we cannot mix normal and wildcard targets
227BOOT_TARGETS1 := zImage zImage.initrd uImage
228BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
229
230PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
231
232boot := arch/$(ARCH)/boot
233
234$(BOOT_TARGETS1): vmlinux
235 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
236$(BOOT_TARGETS2): vmlinux
237 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
238
239
240PHONY += bootwrapper_install
241bootwrapper_install:
242 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
243
244include $(srctree)/scripts/Makefile.defconf
245
246generated_configs += ppc64le_defconfig
247ppc64le_defconfig:
248 $(call merge_into_defconfig,ppc64_defconfig,le)
249
250generated_configs += ppc64le_guest_defconfig
251ppc64le_guest_defconfig:
252 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
253
254generated_configs += ppc64_guest_defconfig
255ppc64_guest_defconfig:
256 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
257
258generated_configs += pseries_le_defconfig
259pseries_le_defconfig: ppc64le_guest_defconfig
260
261generated_configs += pseries_defconfig
262pseries_defconfig: ppc64le_guest_defconfig
263
264generated_configs += powernv_be_defconfig
265powernv_be_defconfig:
266 $(call merge_into_defconfig,powernv_defconfig,be)
267
268generated_configs += mpc85xx_defconfig
269mpc85xx_defconfig:
270 $(call merge_into_defconfig,mpc85xx_base.config,\
271 85xx-32bit 85xx-hw fsl-emb-nonhw)
272
273generated_configs += mpc85xx_smp_defconfig
274mpc85xx_smp_defconfig:
275 $(call merge_into_defconfig,mpc85xx_base.config,\
276 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
277
278generated_configs += corenet32_smp_defconfig
279corenet32_smp_defconfig:
280 $(call merge_into_defconfig,corenet_base.config,\
281 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
282
283generated_configs += corenet64_smp_defconfig
284corenet64_smp_defconfig:
285 $(call merge_into_defconfig,corenet_base.config,\
286 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
287
288generated_configs += mpc86xx_defconfig
289mpc86xx_defconfig:
290 $(call merge_into_defconfig,mpc86xx_base.config,\
291 86xx-hw fsl-emb-nonhw)
292
293generated_configs += mpc86xx_smp_defconfig
294mpc86xx_smp_defconfig:
295 $(call merge_into_defconfig,mpc86xx_base.config,\
296 86xx-smp 86xx-hw fsl-emb-nonhw)
297
298generated_configs += ppc32_allmodconfig
299ppc32_allmodconfig:
300 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
301 -f $(srctree)/Makefile allmodconfig
302
303generated_configs += ppc_defconfig
304ppc_defconfig:
305 $(call merge_into_defconfig,book3s_32.config,)
306
307generated_configs += ppc64le_allmodconfig
308ppc64le_allmodconfig:
309 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
310 -f $(srctree)/Makefile allmodconfig
311
312generated_configs += ppc64le_allnoconfig
313ppc64le_allnoconfig:
314 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
315 -f $(srctree)/Makefile allnoconfig
316
317generated_configs += ppc64_book3e_allmodconfig
318ppc64_book3e_allmodconfig:
319 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
320 -f $(srctree)/Makefile allmodconfig
321
322generated_configs += ppc32_randconfig
323ppc32_randconfig:
324 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
325 -f $(srctree)/Makefile randconfig
326
327generated_configs += ppc64_randconfig
328ppc64_randconfig:
329 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
330 -f $(srctree)/Makefile randconfig
331
332PHONY += $(generated_configs)
333
334define archhelp
335 echo '* zImage - Build default images selected by kernel config'
336 echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
337 echo ' uImage - U-Boot native image format'
338 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
339 echo ' versions which do not support device trees'
340 echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
341 echo ' simpleImage.<dt> - Firmware independent image.'
342 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
343 echo ' install - Install kernel using'
344 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
345 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
346 echo ' install to $$(INSTALL_PATH) and run lilo'
347 echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
348 echo ''
349 echo ' Targets with <dt> embed a device tree blob inside the image'
350 echo ' These targets support board with firmware that does not'
351 echo ' support passing a device tree directly. Replace <dt> with the'
352 echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
353 echo ' (minus the .dts extension).'
354 echo
355 $(foreach cfg,$(generated_configs),
356 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
357endef
358
359PHONY += install
360install:
361 $(call cmd,install)
362
363ifeq ($(KBUILD_EXTMOD),)
364# We need to generate vdso-offsets.h before compiling certain files in kernel/.
365# In order to do that, we should use the archprepare target, but we can't since
366# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
367# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
368# Therefore we need to generate the header after prepare0 has been made, hence
369# this hack.
370prepare: vdso_prepare
371vdso_prepare: prepare0
372 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
373 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
374 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
375 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
376endif
377
378archprepare: checkbin
379
380archheaders:
381 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
382
383ifdef CONFIG_STACKPROTECTOR
384prepare: stack_protector_prepare
385
386PHONY += stack_protector_prepare
387stack_protector_prepare: prepare0
388ifdef CONFIG_PPC64
389 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
390else
391 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
392endif
393endif
394
395PHONY += checkbin
396checkbin:
397 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
398 "x${CONFIG_LD_IS_BFD}" = "xy" -a \
399 "${CONFIG_LD_VERSION}" = "23700" ; then \
400 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
401 echo 'is unable to handle.' ; \
402 echo '*** Please use a different binutils version.' ; \
403 false ; \
404 fi