xref: /openbmc/linux/arch/powerpc/Makefile (revision 42466b9f)
1# This file is included by the global makefile so that you can add your own
2# architecture-specific flags and dependencies. Remember to do have actions
3# for "archclean" and "archdep" for cleaning up and making dependencies for
4# this architecture.
5#
6# This file is subject to the terms and conditions of the GNU General Public
7# License.  See the file "COPYING" in the main directory of this archive
8# for more details.
9#
10# Copyright (C) 1994 by Linus Torvalds
11# Changes for PPC by Gary Thomas
12# Rewritten by Cort Dougan and Paul Mackerras
13#
14
15HAS_BIARCH	:= $(call cc-option-yn, -m32)
16
17# Set default 32 bits cross compilers for vdso and boot wrapper
18CROSS32_COMPILE ?=
19
20ifeq ($(HAS_BIARCH),y)
21ifeq ($(CROSS32_COMPILE),)
22ifdef CONFIG_PPC32
23# These options will be overridden by any -mcpu option that the CPU
24# or platform code sets later on the command line, but they are needed
25# to set a sane 32-bit cpu target for the 64-bit cross compiler which
26# may default to the wrong ISA.
27KBUILD_CFLAGS		+= -mcpu=powerpc
28KBUILD_AFLAGS		+= -mcpu=powerpc
29endif
30endif
31endif
32
33ifdef CONFIG_PPC_BOOK3S_32
34KBUILD_CFLAGS		+= -mcpu=powerpc
35endif
36
37# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
38# ppc64_defconfig because we have nothing better to go on.
39uname := $(shell uname -m)
40KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig
41
42new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
43
44ifeq ($(new_nm),y)
45NM		:= $(NM) --synthetic
46endif
47
48# BITS is used as extension for files which are available in a 32 bit
49# and a 64 bit version to simplify shared Makefiles.
50# e.g.: obj-y += foo_$(BITS).o
51export BITS
52
53ifdef CONFIG_PPC64
54        BITS := 64
55else
56        BITS := 32
57endif
58
59machine-y = ppc
60machine-$(CONFIG_PPC64) += 64
61machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
62UTS_MACHINE := $(subst $(space),,$(machine-y))
63
64# XXX This needs to be before we override LD below
65ifdef CONFIG_PPC32
66KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
67else
68KBUILD_LDS_MODULE += $(srctree)/arch/powerpc/kernel/module.lds
69ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
70# Have the linker provide sfpr if possible.
71# There is a corresponding test in arch/powerpc/lib/Makefile
72KBUILD_LDFLAGS_MODULE += --save-restore-funcs
73else
74KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
75endif
76endif
77
78ifdef CONFIG_CPU_LITTLE_ENDIAN
79KBUILD_CFLAGS	+= -mlittle-endian
80KBUILD_LDFLAGS	+= -EL
81LDEMULATION	:= lppc
82GNUTARGET	:= powerpcle
83MULTIPLEWORD	:= -mno-multiple
84KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
85else
86KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
87KBUILD_LDFLAGS	+= -EB
88LDEMULATION	:= ppc
89GNUTARGET	:= powerpc
90MULTIPLEWORD	:= -mmultiple
91endif
92
93ifdef CONFIG_PPC64
94cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
95cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mcall-aixdesc)
96aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
97aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mabi=elfv2
98endif
99
100ifndef CONFIG_CC_IS_CLANG
101  cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mno-strict-align
102endif
103
104cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)
105cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian
106aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)
107aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian
108
109ifeq ($(HAS_BIARCH),y)
110KBUILD_CFLAGS	+= -m$(BITS)
111KBUILD_AFLAGS	+= -m$(BITS) -Wl,-a$(BITS)
112KBUILD_LDFLAGS	+= -m elf$(BITS)$(LDEMULATION)
113endif
114
115cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard=tls
116ifdef CONFIG_PPC64
117cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard-reg=r13
118else
119cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard-reg=r2
120endif
121
122LDFLAGS_vmlinux-y := -Bstatic
123LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
124LDFLAGS_vmlinux	:= $(LDFLAGS_vmlinux-y)
125LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn)
126
127ifdef CONFIG_PPC64
128ifeq ($(call cc-option-yn,-mcmodel=medium),y)
129	# -mcmodel=medium breaks modules because it uses 32bit offsets from
130	# the TOC pointer to create pointers where possible. Pointers into the
131	# percpu data area are created by this method.
132	#
133	# The kernel module loader relocates the percpu data section from the
134	# original location (starting with 0xd...) to somewhere in the base
135	# kernel percpu data space (starting with 0xc...). We need a full
136	# 64bit relocation for this to work, hence -mcmodel=large.
137	KBUILD_CFLAGS_MODULE += -mcmodel=large
138else
139	export NO_MINIMAL_TOC := -mno-minimal-toc
140endif
141endif
142
143CFLAGS-$(CONFIG_PPC64)	:= $(call cc-option,-mtraceback=no)
144ifdef CONFIG_CPU_LITTLE_ENDIAN
145CFLAGS-$(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)	+= $(call cc-option,-mabi=elfv1)
151endif
152CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
153CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mno-pointers-to-nested-functions)
154
155# Clang unconditionally reserves r2 on ppc32 and does not support the flag
156# https://bugs.llvm.org/show_bug.cgi?id=39555
157CFLAGS-$(CONFIG_PPC32)	:= $(call cc-option, -ffixed-r2)
158
159# Clang doesn't support -mmultiple / -mno-multiple
160# https://bugs.llvm.org/show_bug.cgi?id=39556
161CFLAGS-$(CONFIG_PPC32)	+= $(call cc-option, $(MULTIPLEWORD))
162
163CFLAGS-$(CONFIG_PPC32)	+= $(call cc-option,-mno-readonly-in-sdata)
164
165ifdef CONFIG_PPC_BOOK3S_64
166ifdef CONFIG_CPU_LITTLE_ENDIAN
167CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
168CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
169else
170CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
171CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
172endif
173else
174CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
175endif
176
177ifdef CONFIG_FUNCTION_TRACER
178CC_FLAGS_FTRACE := -pg
179ifdef CONFIG_MPROFILE_KERNEL
180CC_FLAGS_FTRACE += -mprofile-kernel
181endif
182# Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
183# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
184# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
185ifndef CONFIG_CC_IS_CLANG
186CC_FLAGS_FTRACE	+= $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
187endif
188endif
189
190CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
191
192# Altivec option not allowed with e500mc64 in GCC.
193ifdef CONFIG_ALTIVEC
194E5500_CPU := -mcpu=powerpc64
195else
196E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
197endif
198CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
199CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))
200
201ifdef CONFIG_PPC32
202ifdef CONFIG_PPC_E500MC
203CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
204else
205CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
206endif
207endif
208
209asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
210
211KBUILD_CPPFLAGS	+= -I $(srctree)/arch/$(ARCH) $(asinstr)
212KBUILD_AFLAGS	+= $(AFLAGS-y)
213KBUILD_CFLAGS	+= $(call cc-option,-msoft-float)
214KBUILD_CFLAGS	+= -pipe $(CFLAGS-y)
215CPP		= $(CC) -E $(KBUILD_CFLAGS)
216
217CHECKFLAGS	+= -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
218ifdef CONFIG_CPU_BIG_ENDIAN
219CHECKFLAGS	+= -D__BIG_ENDIAN__
220else
221CHECKFLAGS	+= -D__LITTLE_ENDIAN__
222endif
223
224ifdef CONFIG_476FPE_ERR46
225	KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
226		-T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
227endif
228
229# No AltiVec or VSX instructions when building kernel
230KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
231KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
232
233# No SPE instruction when building kernel
234# (We use all available options to help semi-broken compilers)
235KBUILD_CFLAGS += $(call cc-option,-mno-spe)
236KBUILD_CFLAGS += $(call cc-option,-mspe=no)
237
238# FIXME: the module load should be taught about the additional relocs
239# generated by this.
240# revert to pre-gcc-4.4 behaviour of .eh_frame
241KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
242
243# Never use string load/store instructions as they are
244# often slow when they are implemented at all
245KBUILD_CFLAGS		+= $(call cc-option,-mno-string)
246
247cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
248cpu-as-$(CONFIG_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)
249cpu-as-$(CONFIG_E200)		+= -Wa,-me200
250cpu-as-$(CONFIG_E500)		+= -Wa,-me500
251
252# When using '-many -mpower4' gas will first try and find a matching power4
253# mnemonic and failing that it will allow any valid mnemonic that GAS knows
254# about. GCC will pass -many to GAS when assembling, clang does not.
255cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= -Wa,-mpower4 -Wa,-many
256cpu-as-$(CONFIG_PPC_E500MC)	+= $(call as-option,-Wa$(comma)-me500mc)
257
258KBUILD_AFLAGS += $(cpu-as-y)
259KBUILD_CFLAGS += $(cpu-as-y)
260
261KBUILD_AFLAGS += $(aflags-y)
262KBUILD_CFLAGS += $(cflags-y)
263
264head-y				:= arch/powerpc/kernel/head_$(BITS).o
265head-$(CONFIG_PPC_8xx)		:= arch/powerpc/kernel/head_8xx.o
266head-$(CONFIG_40x)		:= arch/powerpc/kernel/head_40x.o
267head-$(CONFIG_44x)		:= arch/powerpc/kernel/head_44x.o
268head-$(CONFIG_FSL_BOOKE)	:= arch/powerpc/kernel/head_fsl_booke.o
269
270head-$(CONFIG_PPC64)		+= arch/powerpc/kernel/entry_64.o
271head-$(CONFIG_PPC_FPU)		+= arch/powerpc/kernel/fpu.o
272head-$(CONFIG_ALTIVEC)		+= arch/powerpc/kernel/vector.o
273head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE)  += arch/powerpc/kernel/prom_init.o
274
275# See arch/powerpc/Kbuild for content of core part of the kernel
276core-y += arch/powerpc/
277
278drivers-$(CONFIG_OPROFILE)	+= arch/powerpc/oprofile/
279
280# Default to zImage, override when needed
281all: zImage
282
283# With make 3.82 we cannot mix normal and wildcard targets
284BOOT_TARGETS1 := zImage zImage.initrd uImage
285BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
286
287PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
288
289boot := arch/$(ARCH)/boot
290
291$(BOOT_TARGETS1): vmlinux
292	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
293$(BOOT_TARGETS2): vmlinux
294	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
295
296
297bootwrapper_install:
298	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
299
300# Used to create 'merged defconfigs'
301# To use it $(call) it with the first argument as the base defconfig
302# and the second argument as a space separated list of .config files to merge,
303# without the .config suffix.
304define merge_into_defconfig
305	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
306		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
307		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
308	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
309endef
310
311PHONY += pseries_le_defconfig
312pseries_le_defconfig:
313	$(call merge_into_defconfig,pseries_defconfig,le)
314
315PHONY += ppc64le_defconfig
316ppc64le_defconfig:
317	$(call merge_into_defconfig,ppc64_defconfig,le)
318
319PHONY += ppc64le_guest_defconfig
320ppc64le_guest_defconfig:
321	$(call merge_into_defconfig,ppc64_defconfig,le guest)
322
323PHONY += ppc64_guest_defconfig
324ppc64_guest_defconfig:
325	$(call merge_into_defconfig,ppc64_defconfig,be guest)
326
327PHONY += powernv_be_defconfig
328powernv_be_defconfig:
329	$(call merge_into_defconfig,powernv_defconfig,be)
330
331PHONY += mpc85xx_defconfig
332mpc85xx_defconfig:
333	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
334		85xx-32bit 85xx-hw fsl-emb-nonhw)
335
336PHONY += mpc85xx_smp_defconfig
337mpc85xx_smp_defconfig:
338	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
339		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
340
341PHONY += corenet32_smp_defconfig
342corenet32_smp_defconfig:
343	$(call merge_into_defconfig,corenet_basic_defconfig,\
344		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
345
346PHONY += corenet64_smp_defconfig
347corenet64_smp_defconfig:
348	$(call merge_into_defconfig,corenet_basic_defconfig,\
349		85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
350
351PHONY += mpc86xx_defconfig
352mpc86xx_defconfig:
353	$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
354		86xx-hw fsl-emb-nonhw)
355
356PHONY += mpc86xx_smp_defconfig
357mpc86xx_smp_defconfig:
358	$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
359		86xx-smp 86xx-hw fsl-emb-nonhw)
360
361PHONY += ppc32_allmodconfig
362ppc32_allmodconfig:
363	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
364		-f $(srctree)/Makefile allmodconfig
365
366PHONY += ppc_defconfig
367ppc_defconfig:
368	$(call merge_into_defconfig,book3s_32.config,)
369
370PHONY += ppc64le_allmodconfig
371ppc64le_allmodconfig:
372	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
373		-f $(srctree)/Makefile allmodconfig
374
375PHONY += ppc64_book3e_allmodconfig
376ppc64_book3e_allmodconfig:
377	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
378		-f $(srctree)/Makefile allmodconfig
379
380define archhelp
381  @echo '* zImage          - Build default images selected by kernel config'
382  @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
383  @echo '  uImage          - U-Boot native image format'
384  @echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
385  @echo '                    versions which do not support device trees'
386  @echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
387  @echo '  simpleImage.<dt> - Firmware independent image.'
388  @echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
389  @echo '  install         - Install kernel using'
390  @echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
391  @echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
392  @echo '                    install to $$(INSTALL_PATH) and run lilo'
393  @echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
394  @echo ''
395  @echo '  Targets with <dt> embed a device tree blob inside the image'
396  @echo '  These targets support board with firmware that does not'
397  @echo '  support passing a device tree directly.  Replace <dt> with the'
398  @echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
399  @echo '  (minus the .dts extension).'
400endef
401
402install:
403	$(Q)$(MAKE) $(build)=$(boot) install
404
405vdso_install:
406ifdef CONFIG_PPC64
407	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
408endif
409ifdef CONFIG_VDSO32
410	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
411endif
412
413archclean:
414	$(Q)$(MAKE) $(clean)=$(boot)
415
416archprepare: checkbin
417
418archheaders:
419	$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
420
421ifdef CONFIG_STACKPROTECTOR
422prepare: stack_protector_prepare
423
424stack_protector_prepare: prepare0
425ifdef CONFIG_PPC64
426	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
427else
428	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
429endif
430endif
431
432ifdef CONFIG_SMP
433prepare: task_cpu_prepare
434
435task_cpu_prepare: prepare0
436	$(eval KBUILD_CFLAGS += -D_TASK_CPU=$(shell awk '{if ($$2 == "TASK_CPU") print $$3;}' include/generated/asm-offsets.h))
437endif
438
439# Check toolchain versions:
440# - gcc-4.6 is the minimum kernel-wide version so nothing required.
441checkbin:
442	@if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
443	    && $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
444		echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
445		echo 'in some circumstances.' ; \
446		echo -n '*** Please use a different binutils version.' ; \
447		false ; \
448	fi
449