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)	+= $(call cc-option,-mno-readonly-in-sdata)
144
145ifdef CONFIG_FUNCTION_TRACER
146ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY
147KBUILD_CPPFLAGS	+= -DCC_USING_PATCHABLE_FUNCTION_ENTRY
148CC_FLAGS_FTRACE := -fpatchable-function-entry=2
149else
150CC_FLAGS_FTRACE := -pg
151ifdef CONFIG_MPROFILE_KERNEL
152CC_FLAGS_FTRACE += -mprofile-kernel
153endif
154endif
155endif
156
157CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
158AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
159
160CFLAGS-y += $(CONFIG_TUNE_CPU)
161
162asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
163
164KBUILD_CPPFLAGS	+= -I $(srctree)/arch/$(ARCH) $(asinstr)
165KBUILD_AFLAGS	+= $(AFLAGS-y)
166KBUILD_CFLAGS	+= $(call cc-option,-msoft-float)
167KBUILD_CFLAGS	+= $(CFLAGS-y)
168CPP		= $(CC) -E $(KBUILD_CFLAGS)
169
170CHECKFLAGS	+= -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
171ifdef CONFIG_CPU_BIG_ENDIAN
172CHECKFLAGS	+= -D__BIG_ENDIAN__
173else
174CHECKFLAGS	+= -D__LITTLE_ENDIAN__
175endif
176
177ifdef CONFIG_476FPE_ERR46
178	KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
179		-T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
180endif
181
182# No prefix or pcrel
183ifdef CONFIG_PPC_KERNEL_PREFIXED
184KBUILD_CFLAGS += $(call cc-option,-mprefixed)
185else
186KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
187endif
188ifdef CONFIG_PPC_KERNEL_PCREL
189KBUILD_CFLAGS += $(call cc-option,-mpcrel)
190else
191KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
192endif
193
194# No AltiVec or VSX or MMA instructions when building kernel
195KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
196KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
197KBUILD_CFLAGS += $(call cc-option,-mno-mma)
198
199# No SPE instruction when building kernel
200# (We use all available options to help semi-broken compilers)
201KBUILD_CFLAGS += $(call cc-option,-mno-spe)
202KBUILD_CFLAGS += $(call cc-option,-mspe=no)
203
204# Don't emit .eh_frame since we have no use for it
205KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
206
207# Never use string load/store instructions as they are
208# often slow when they are implemented at all
209KBUILD_CFLAGS		+= $(call cc-option,-mno-string)
210
211cpu-as-$(CONFIG_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)
212
213# When using '-many -mpower4' gas will first try and find a matching power4
214# mnemonic and failing that it will allow any valid mnemonic that GAS knows
215# about. GCC will pass -many to GAS when assembling, clang does not.
216# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
217# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
218cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)
219
220KBUILD_AFLAGS += $(cpu-as-y)
221KBUILD_CFLAGS += $(cpu-as-y)
222
223KBUILD_AFLAGS += $(aflags-y)
224KBUILD_CFLAGS += $(cflags-y)
225
226# Default to zImage, override when needed
227all: zImage
228
229# With make 3.82 we cannot mix normal and wildcard targets
230BOOT_TARGETS1 := zImage zImage.initrd uImage
231BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
232
233PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
234
235boot := arch/$(ARCH)/boot
236
237$(BOOT_TARGETS1): vmlinux
238	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
239$(BOOT_TARGETS2): vmlinux
240	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
241
242
243PHONY += bootwrapper_install
244bootwrapper_install:
245	$(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
246
247include $(srctree)/scripts/Makefile.defconf
248
249generated_configs += ppc64le_defconfig
250ppc64le_defconfig:
251	$(call merge_into_defconfig,ppc64_defconfig,le)
252
253generated_configs += ppc64le_guest_defconfig
254ppc64le_guest_defconfig:
255	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
256
257generated_configs += ppc64_guest_defconfig
258ppc64_guest_defconfig:
259	$(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
260
261generated_configs += pseries_le_defconfig
262pseries_le_defconfig: ppc64le_guest_defconfig
263
264generated_configs += pseries_defconfig
265pseries_defconfig: ppc64le_guest_defconfig
266
267generated_configs += powernv_be_defconfig
268powernv_be_defconfig:
269	$(call merge_into_defconfig,powernv_defconfig,be)
270
271generated_configs += mpc85xx_defconfig
272mpc85xx_defconfig:
273	$(call merge_into_defconfig,mpc85xx_base.config,\
274		85xx-32bit 85xx-hw fsl-emb-nonhw)
275
276generated_configs += mpc85xx_smp_defconfig
277mpc85xx_smp_defconfig:
278	$(call merge_into_defconfig,mpc85xx_base.config,\
279		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
280
281generated_configs += corenet32_smp_defconfig
282corenet32_smp_defconfig:
283	$(call merge_into_defconfig,corenet_base.config,\
284		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
285
286generated_configs += corenet64_smp_defconfig
287corenet64_smp_defconfig:
288	$(call merge_into_defconfig,corenet_base.config,\
289		85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
290
291generated_configs += mpc86xx_defconfig
292mpc86xx_defconfig:
293	$(call merge_into_defconfig,mpc86xx_base.config,\
294		86xx-hw fsl-emb-nonhw)
295
296generated_configs += mpc86xx_smp_defconfig
297mpc86xx_smp_defconfig:
298	$(call merge_into_defconfig,mpc86xx_base.config,\
299		86xx-smp 86xx-hw fsl-emb-nonhw)
300
301generated_configs += ppc32_allmodconfig
302ppc32_allmodconfig:
303	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
304		-f $(srctree)/Makefile allmodconfig
305
306generated_configs += ppc_defconfig
307ppc_defconfig:
308	$(call merge_into_defconfig,book3s_32.config,)
309
310generated_configs += ppc64le_allmodconfig
311ppc64le_allmodconfig:
312	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
313		-f $(srctree)/Makefile allmodconfig
314
315generated_configs += ppc64le_allnoconfig
316ppc64le_allnoconfig:
317	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
318		-f $(srctree)/Makefile allnoconfig
319
320generated_configs += ppc64_book3e_allmodconfig
321ppc64_book3e_allmodconfig:
322	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
323		-f $(srctree)/Makefile allmodconfig
324
325generated_configs += ppc32_randconfig
326ppc32_randconfig:
327	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
328		-f $(srctree)/Makefile randconfig
329
330generated_configs += ppc64_randconfig
331ppc64_randconfig:
332	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
333		-f $(srctree)/Makefile randconfig
334
335PHONY += $(generated_configs)
336
337define archhelp
338  echo '* zImage          - Build default images selected by kernel config'
339  echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
340  echo '  uImage          - U-Boot native image format'
341  echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
342  echo '                    versions which do not support device trees'
343  echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
344  echo '  simpleImage.<dt> - Firmware independent image.'
345  echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
346  echo '  install         - Install kernel using'
347  echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
348  echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
349  echo '                    install to $$(INSTALL_PATH) and run lilo'
350  echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
351  echo ''
352  echo '  Targets with <dt> embed a device tree blob inside the image'
353  echo '  These targets support board with firmware that does not'
354  echo '  support passing a device tree directly.  Replace <dt> with the'
355  echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
356  echo '  (minus the .dts extension).'
357  echo
358  $(foreach cfg,$(generated_configs),
359    printf "  %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
360endef
361
362PHONY += install
363install:
364	$(call cmd,install)
365
366ifeq ($(KBUILD_EXTMOD),)
367# We need to generate vdso-offsets.h before compiling certain files in kernel/.
368# In order to do that, we should use the archprepare target, but we can't since
369# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
370# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
371# Therefore we need to generate the header after prepare0 has been made, hence
372# this hack.
373prepare: vdso_prepare
374vdso_prepare: prepare0
375	$(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
376		$(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
377	$(if $(CONFIG_PPC64),$(Q)$(MAKE) \
378		$(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
379endif
380
381archprepare: checkbin
382
383archheaders:
384	$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
385
386ifdef CONFIG_STACKPROTECTOR
387prepare: stack_protector_prepare
388
389PHONY += stack_protector_prepare
390stack_protector_prepare: prepare0
391ifdef CONFIG_PPC64
392	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
393else
394	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
395endif
396endif
397
398PHONY += checkbin
399checkbin:
400	@if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
401		"x${CONFIG_LD_IS_BFD}" = "xy" -a \
402		"${CONFIG_LD_VERSION}" = "23700" ; then \
403		echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
404		echo 'is unable to handle.' ; \
405		echo '*** Please use a different binutils version.' ; \
406		false ; \
407	fi
408