tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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 := $(call cc-option-yn, -m32)
14
15# Set default 32 bits cross compilers for vdso and boot wrapper
16CROSS32_COMPILE ?=
17
18ifeq ($(HAS_BIARCH),y)
19ifeq ($(CROSS32_COMPILE),)
20ifdef CONFIG_PPC32
21# These options will be overridden by any -mcpu option that the CPU
22# or platform code sets later on the command line, but they are needed
23# to set a sane 32-bit cpu target for the 64-bit cross compiler which
24# may default to the wrong ISA.
25KBUILD_CFLAGS += -mcpu=powerpc
26KBUILD_AFLAGS += -mcpu=powerpc
27endif
28endif
29endif
30
31ifdef CONFIG_PPC_BOOK3S_32
32KBUILD_CFLAGS += -mcpu=powerpc
33endif
34
35# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
36# ppc64_defconfig because we have nothing better to go on.
37uname := $(shell uname -m)
38KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
39
40new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
41
42ifeq ($(new_nm),y)
43NM := $(NM) --synthetic
44endif
45
46# BITS is used as extension for files which are available in a 32 bit
47# and a 64 bit version to simplify shared Makefiles.
48# e.g.: obj-y += foo_$(BITS).o
49export BITS
50
51ifdef CONFIG_PPC64
52 BITS := 64
53else
54 BITS := 32
55endif
56
57machine-y = ppc
58machine-$(CONFIG_PPC64) += 64
59machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
60UTS_MACHINE := $(subst $(space),,$(machine-y))
61
62# XXX This needs to be before we override LD below
63ifdef CONFIG_PPC32
64KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
65else
66ifeq ($(call ld-ifversion, -ge, 22500, y),y)
67# Have the linker provide sfpr if possible.
68# There is a corresponding test in arch/powerpc/lib/Makefile
69KBUILD_LDFLAGS_MODULE += --save-restore-funcs
70else
71KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
72endif
73endif
74
75ifdef CONFIG_CPU_LITTLE_ENDIAN
76KBUILD_CFLAGS += -mlittle-endian
77KBUILD_LDFLAGS += -EL
78LDEMULATION := lppc
79GNUTARGET := powerpcle
80MULTIPLEWORD := -mno-multiple
81KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
82else
83KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
84KBUILD_LDFLAGS += -EB
85LDEMULATION := ppc
86GNUTARGET := powerpc
87MULTIPLEWORD := -mmultiple
88endif
89
90ifdef CONFIG_PPC64
91ifndef CONFIG_CC_IS_CLANG
92cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
93cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mcall-aixdesc)
94aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
95aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
96endif
97endif
98
99ifndef CONFIG_CC_IS_CLANG
100 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
101endif
102
103cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
104cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
105aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
106aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
107
108ifeq ($(HAS_BIARCH),y)
109KBUILD_CFLAGS += -m$(BITS)
110KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
111KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
112endif
113
114cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
115ifdef CONFIG_PPC64
116cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
117else
118cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
119endif
120
121LDFLAGS_vmlinux-y := -Bstatic
122LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
123LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
124LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
125
126ifdef CONFIG_PPC64
127ifeq ($(call cc-option-yn,-mcmodel=medium),y)
128 # -mcmodel=medium breaks modules because it uses 32bit offsets from
129 # the TOC pointer to create pointers where possible. Pointers into the
130 # percpu data area are created by this method.
131 #
132 # The kernel module loader relocates the percpu data section from the
133 # original location (starting with 0xd...) to somewhere in the base
134 # kernel percpu data space (starting with 0xc...). We need a full
135 # 64bit relocation for this to work, hence -mcmodel=large.
136 KBUILD_CFLAGS_MODULE += -mcmodel=large
137else
138 export NO_MINIMAL_TOC := -mno-minimal-toc
139endif
140endif
141
142CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
143ifndef CONFIG_CC_IS_CLANG
144ifdef CONFIG_CPU_LITTLE_ENDIAN
145CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
146AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
147else
148CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
149CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
150AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
151endif
152endif
153CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
154CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
155
156# Clang unconditionally reserves r2 on ppc32 and does not support the flag
157# https://bugs.llvm.org/show_bug.cgi?id=39555
158CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
159
160# Clang doesn't support -mmultiple / -mno-multiple
161# https://bugs.llvm.org/show_bug.cgi?id=39556
162CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
163
164CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
165
166ifdef CONFIG_PPC_BOOK3S_64
167ifdef CONFIG_CPU_LITTLE_ENDIAN
168CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
169CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
170else
171CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
172CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
173endif
174else ifdef CONFIG_PPC_BOOK3E_64
175CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
176endif
177
178ifdef CONFIG_FUNCTION_TRACER
179CC_FLAGS_FTRACE := -pg
180ifdef CONFIG_MPROFILE_KERNEL
181CC_FLAGS_FTRACE += -mprofile-kernel
182endif
183endif
184
185CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
186
187# Altivec option not allowed with e500mc64 in GCC.
188ifdef CONFIG_ALTIVEC
189E5500_CPU := -mcpu=powerpc64
190else
191E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
192endif
193CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
194CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
195
196ifdef CONFIG_PPC32
197ifdef CONFIG_PPC_E500MC
198CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
199else
200CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
201endif
202endif
203
204asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
205
206KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
207KBUILD_AFLAGS += $(AFLAGS-y)
208KBUILD_CFLAGS += $(call cc-option,-msoft-float)
209KBUILD_CFLAGS += -pipe $(CFLAGS-y)
210CPP = $(CC) -E $(KBUILD_CFLAGS)
211
212CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
213ifdef CONFIG_CPU_BIG_ENDIAN
214CHECKFLAGS += -D__BIG_ENDIAN__
215else
216CHECKFLAGS += -D__LITTLE_ENDIAN__ -D_CALL_ELF=2
217endif
218
219ifdef CONFIG_476FPE_ERR46
220 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
221 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
222endif
223
224# No AltiVec or VSX instructions when building kernel
225KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
226KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
227
228# No SPE instruction when building kernel
229# (We use all available options to help semi-broken compilers)
230KBUILD_CFLAGS += $(call cc-option,-mno-spe)
231KBUILD_CFLAGS += $(call cc-option,-mspe=no)
232
233# Don't emit .eh_frame since we have no use for it
234KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
235
236# Never use string load/store instructions as they are
237# often slow when they are implemented at all
238KBUILD_CFLAGS += $(call cc-option,-mno-string)
239
240cpu-as-$(CONFIG_40x) += -Wa,-m405
241cpu-as-$(CONFIG_44x) += -Wa,-m440
242cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
243cpu-as-$(CONFIG_E500) += -Wa,-me500
244
245# When using '-many -mpower4' gas will first try and find a matching power4
246# mnemonic and failing that it will allow any valid mnemonic that GAS knows
247# about. GCC will pass -many to GAS when assembling, clang does not.
248# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
249# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
250cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
251cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc)
252
253KBUILD_AFLAGS += $(cpu-as-y)
254KBUILD_CFLAGS += $(cpu-as-y)
255
256KBUILD_AFLAGS += $(aflags-y)
257KBUILD_CFLAGS += $(cflags-y)
258
259head-$(CONFIG_PPC64) := arch/powerpc/kernel/head_64.o
260head-$(CONFIG_PPC_BOOK3S_32) := arch/powerpc/kernel/head_book3s_32.o
261head-$(CONFIG_PPC_8xx) := arch/powerpc/kernel/head_8xx.o
262head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
263head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
264head-$(CONFIG_FSL_BOOKE) := arch/powerpc/kernel/head_fsl_booke.o
265
266head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
267head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
268head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
269head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.o
270
271# Default to zImage, override when needed
272all: zImage
273
274# With make 3.82 we cannot mix normal and wildcard targets
275BOOT_TARGETS1 := zImage zImage.initrd uImage
276BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
277
278PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
279
280boot := arch/$(ARCH)/boot
281
282$(BOOT_TARGETS1): vmlinux
283 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
284$(BOOT_TARGETS2): vmlinux
285 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
286
287
288PHONY += bootwrapper_install
289bootwrapper_install:
290 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
291
292# Used to create 'merged defconfigs'
293# To use it $(call) it with the first argument as the base defconfig
294# and the second argument as a space separated list of .config files to merge,
295# without the .config suffix.
296define merge_into_defconfig
297 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
298 -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
299 $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
300 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
301endef
302
303PHONY += pseries_le_defconfig
304pseries_le_defconfig:
305 $(call merge_into_defconfig,pseries_defconfig,le)
306
307PHONY += ppc64le_defconfig
308ppc64le_defconfig:
309 $(call merge_into_defconfig,ppc64_defconfig,le)
310
311PHONY += ppc64le_guest_defconfig
312ppc64le_guest_defconfig:
313 $(call merge_into_defconfig,ppc64_defconfig,le guest)
314
315PHONY += ppc64_guest_defconfig
316ppc64_guest_defconfig:
317 $(call merge_into_defconfig,ppc64_defconfig,be guest)
318
319PHONY += powernv_be_defconfig
320powernv_be_defconfig:
321 $(call merge_into_defconfig,powernv_defconfig,be)
322
323PHONY += mpc85xx_defconfig
324mpc85xx_defconfig:
325 $(call merge_into_defconfig,mpc85xx_base.config,\
326 85xx-32bit 85xx-hw fsl-emb-nonhw)
327
328PHONY += mpc85xx_smp_defconfig
329mpc85xx_smp_defconfig:
330 $(call merge_into_defconfig,mpc85xx_base.config,\
331 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
332
333PHONY += corenet32_smp_defconfig
334corenet32_smp_defconfig:
335 $(call merge_into_defconfig,corenet_base.config,\
336 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
337
338PHONY += corenet64_smp_defconfig
339corenet64_smp_defconfig:
340 $(call merge_into_defconfig,corenet_base.config,\
341 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
342
343PHONY += mpc86xx_defconfig
344mpc86xx_defconfig:
345 $(call merge_into_defconfig,mpc86xx_base.config,\
346 86xx-hw fsl-emb-nonhw)
347
348PHONY += mpc86xx_smp_defconfig
349mpc86xx_smp_defconfig:
350 $(call merge_into_defconfig,mpc86xx_base.config,\
351 86xx-smp 86xx-hw fsl-emb-nonhw)
352
353PHONY += ppc32_allmodconfig
354ppc32_allmodconfig:
355 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
356 -f $(srctree)/Makefile allmodconfig
357
358PHONY += ppc_defconfig
359ppc_defconfig:
360 $(call merge_into_defconfig,book3s_32.config,)
361
362PHONY += ppc64le_allmodconfig
363ppc64le_allmodconfig:
364 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
365 -f $(srctree)/Makefile allmodconfig
366
367PHONY += ppc64le_allnoconfig
368ppc64le_allnoconfig:
369 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
370 -f $(srctree)/Makefile allnoconfig
371
372PHONY += ppc64_book3e_allmodconfig
373ppc64_book3e_allmodconfig:
374 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
375 -f $(srctree)/Makefile allmodconfig
376
377PHONY += ppc32_randconfig
378ppc32_randconfig:
379 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
380 -f $(srctree)/Makefile randconfig
381
382PHONY += ppc64_randconfig
383ppc64_randconfig:
384 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
385 -f $(srctree)/Makefile randconfig
386
387define archhelp
388 @echo '* zImage - Build default images selected by kernel config'
389 @echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
390 @echo ' uImage - U-Boot native image format'
391 @echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
392 @echo ' versions which do not support device trees'
393 @echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
394 @echo ' simpleImage.<dt> - Firmware independent image.'
395 @echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
396 @echo ' install - Install kernel using'
397 @echo ' (your) ~/bin/$(INSTALLKERNEL) or'
398 @echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
399 @echo ' install to $$(INSTALL_PATH) and run lilo'
400 @echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
401 @echo ''
402 @echo ' Targets with <dt> embed a device tree blob inside the image'
403 @echo ' These targets support board with firmware that does not'
404 @echo ' support passing a device tree directly. Replace <dt> with the'
405 @echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
406 @echo ' (minus the .dts extension).'
407endef
408
409PHONY += install
410install:
411 sh -x $(srctree)/$(boot)/install.sh "$(KERNELRELEASE)" vmlinux \
412 System.map "$(INSTALL_PATH)"
413
414ifeq ($(KBUILD_EXTMOD),)
415# We need to generate vdso-offsets.h before compiling certain files in kernel/.
416# In order to do that, we should use the archprepare target, but we can't since
417# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
418# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
419# Therefore we need to generate the header after prepare0 has been made, hence
420# this hack.
421prepare: vdso_prepare
422vdso_prepare: prepare0
423 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
424 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
425 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
426 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
427endif
428
429archprepare: checkbin
430
431archheaders:
432 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
433
434ifdef CONFIG_STACKPROTECTOR
435prepare: stack_protector_prepare
436
437PHONY += stack_protector_prepare
438stack_protector_prepare: prepare0
439ifdef CONFIG_PPC64
440 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
441else
442 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
443endif
444endif
445
446PHONY += checkbin
447# Check toolchain versions:
448# - gcc-4.6 is the minimum kernel-wide version so nothing required.
449checkbin:
450 @if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
451 "x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
452 echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
453 echo 'in some circumstances.' ; \
454 echo '*** binutils 2.23 do not define the TOC symbol ' ; \
455 echo -n '*** Please use a different binutils version.' ; \
456 false ; \
457 fi