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) += $(call cc-option,-mcpu=power5,-mcpu=power4)
173endif
174else
175CFLAGS-$(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__
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-$(CONFIG_E500)		+= -Wa,-me500
244
245# When using '-many -mpower4' gas will first try and find a matching power4
246# mnemonic and failing that it will allow any valid mnemonic that GAS knows
247# about. GCC will pass -many to GAS when assembling, clang does not.
248cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= -Wa,-mpower4 -Wa,-many
249cpu-as-$(CONFIG_PPC_E500MC)	+= $(call as-option,-Wa$(comma)-me500mc)
250
251KBUILD_AFLAGS += $(cpu-as-y)
252KBUILD_CFLAGS += $(cpu-as-y)
253
254KBUILD_AFLAGS += $(aflags-y)
255KBUILD_CFLAGS += $(cflags-y)
256
257head-$(CONFIG_PPC64)		:= arch/powerpc/kernel/head_64.o
258head-$(CONFIG_PPC_BOOK3S_32)	:= arch/powerpc/kernel/head_book3s_32.o
259head-$(CONFIG_PPC_8xx)		:= arch/powerpc/kernel/head_8xx.o
260head-$(CONFIG_40x)		:= arch/powerpc/kernel/head_40x.o
261head-$(CONFIG_44x)		:= arch/powerpc/kernel/head_44x.o
262head-$(CONFIG_FSL_BOOKE)	:= arch/powerpc/kernel/head_fsl_booke.o
263
264head-$(CONFIG_PPC64)		+= arch/powerpc/kernel/entry_64.o
265head-$(CONFIG_PPC_FPU)		+= arch/powerpc/kernel/fpu.o
266head-$(CONFIG_ALTIVEC)		+= arch/powerpc/kernel/vector.o
267head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE)  += arch/powerpc/kernel/prom_init.o
268
269# Default to zImage, override when needed
270all: zImage
271
272# With make 3.82 we cannot mix normal and wildcard targets
273BOOT_TARGETS1 := zImage zImage.initrd uImage
274BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
275
276PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
277
278boot := arch/$(ARCH)/boot
279
280$(BOOT_TARGETS1): vmlinux
281	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
282$(BOOT_TARGETS2): vmlinux
283	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
284
285
286PHONY += bootwrapper_install
287bootwrapper_install:
288	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
289
290# Used to create 'merged defconfigs'
291# To use it $(call) it with the first argument as the base defconfig
292# and the second argument as a space separated list of .config files to merge,
293# without the .config suffix.
294define merge_into_defconfig
295	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
296		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
297		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
298	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
299endef
300
301PHONY += pseries_le_defconfig
302pseries_le_defconfig:
303	$(call merge_into_defconfig,pseries_defconfig,le)
304
305PHONY += ppc64le_defconfig
306ppc64le_defconfig:
307	$(call merge_into_defconfig,ppc64_defconfig,le)
308
309PHONY += ppc64le_guest_defconfig
310ppc64le_guest_defconfig:
311	$(call merge_into_defconfig,ppc64_defconfig,le guest)
312
313PHONY += ppc64_guest_defconfig
314ppc64_guest_defconfig:
315	$(call merge_into_defconfig,ppc64_defconfig,be guest)
316
317PHONY += powernv_be_defconfig
318powernv_be_defconfig:
319	$(call merge_into_defconfig,powernv_defconfig,be)
320
321PHONY += mpc85xx_defconfig
322mpc85xx_defconfig:
323	$(call merge_into_defconfig,mpc85xx_base.config,\
324		85xx-32bit 85xx-hw fsl-emb-nonhw)
325
326PHONY += mpc85xx_smp_defconfig
327mpc85xx_smp_defconfig:
328	$(call merge_into_defconfig,mpc85xx_base.config,\
329		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
330
331PHONY += corenet32_smp_defconfig
332corenet32_smp_defconfig:
333	$(call merge_into_defconfig,corenet_base.config,\
334		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
335
336PHONY += corenet64_smp_defconfig
337corenet64_smp_defconfig:
338	$(call merge_into_defconfig,corenet_base.config,\
339		85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
340
341PHONY += mpc86xx_defconfig
342mpc86xx_defconfig:
343	$(call merge_into_defconfig,mpc86xx_base.config,\
344		86xx-hw fsl-emb-nonhw)
345
346PHONY += mpc86xx_smp_defconfig
347mpc86xx_smp_defconfig:
348	$(call merge_into_defconfig,mpc86xx_base.config,\
349		86xx-smp 86xx-hw fsl-emb-nonhw)
350
351PHONY += ppc32_allmodconfig
352ppc32_allmodconfig:
353	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
354		-f $(srctree)/Makefile allmodconfig
355
356PHONY += ppc_defconfig
357ppc_defconfig:
358	$(call merge_into_defconfig,book3s_32.config,)
359
360PHONY += ppc64le_allmodconfig
361ppc64le_allmodconfig:
362	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
363		-f $(srctree)/Makefile allmodconfig
364
365PHONY += ppc64le_allnoconfig
366ppc64le_allnoconfig:
367	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
368		-f $(srctree)/Makefile allnoconfig
369
370PHONY += ppc64_book3e_allmodconfig
371ppc64_book3e_allmodconfig:
372	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
373		-f $(srctree)/Makefile allmodconfig
374
375PHONY += ppc32_randconfig
376ppc32_randconfig:
377	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
378		-f $(srctree)/Makefile randconfig
379
380PHONY += ppc64_randconfig
381ppc64_randconfig:
382	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
383		-f $(srctree)/Makefile randconfig
384
385define archhelp
386  @echo '* zImage          - Build default images selected by kernel config'
387  @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
388  @echo '  uImage          - U-Boot native image format'
389  @echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
390  @echo '                    versions which do not support device trees'
391  @echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
392  @echo '  simpleImage.<dt> - Firmware independent image.'
393  @echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
394  @echo '  install         - Install kernel using'
395  @echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
396  @echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
397  @echo '                    install to $$(INSTALL_PATH) and run lilo'
398  @echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
399  @echo ''
400  @echo '  Targets with <dt> embed a device tree blob inside the image'
401  @echo '  These targets support board with firmware that does not'
402  @echo '  support passing a device tree directly.  Replace <dt> with the'
403  @echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
404  @echo '  (minus the .dts extension).'
405endef
406
407PHONY += install
408install:
409	sh -x $(srctree)/$(boot)/install.sh "$(KERNELRELEASE)" vmlinux \
410	System.map "$(INSTALL_PATH)"
411
412ifeq ($(KBUILD_EXTMOD),)
413# We need to generate vdso-offsets.h before compiling certain files in kernel/.
414# In order to do that, we should use the archprepare target, but we can't since
415# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
416# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
417# Therefore we need to generate the header after prepare0 has been made, hence
418# this hack.
419prepare: vdso_prepare
420vdso_prepare: prepare0
421	$(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
422		$(build)=arch/powerpc/kernel/vdso32 include/generated/vdso32-offsets.h)
423	$(if $(CONFIG_PPC64),$(Q)$(MAKE) \
424		$(build)=arch/powerpc/kernel/vdso64 include/generated/vdso64-offsets.h)
425endif
426
427archprepare: checkbin
428
429archheaders:
430	$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
431
432ifdef CONFIG_STACKPROTECTOR
433prepare: stack_protector_prepare
434
435PHONY += stack_protector_prepare
436stack_protector_prepare: prepare0
437ifdef CONFIG_PPC64
438	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
439else
440	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
441endif
442endif
443
444PHONY += checkbin
445# Check toolchain versions:
446# - gcc-4.6 is the minimum kernel-wide version so nothing required.
447checkbin:
448	@if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
449	    && $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
450		echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
451		echo 'in some circumstances.' ; \
452		echo -n '*** Please use a different binutils version.' ; \
453		false ; \
454	fi
455