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
13 ifdef cross_compiling
14 ifeq ($(CROSS_COMPILE),)
15 # Auto detect cross compiler prefix.
16 # Look for: (powerpc(64(le)?)?)(-unknown)?-linux(-gnu)?-
17 CC_ARCHES := powerpc powerpc64 powerpc64le
18 CC_SUFFIXES := linux linux-gnu unknown-linux-gnu
19 CROSS_COMPILE := $(call cc-cross-prefix, $(foreach a,$(CC_ARCHES), \
20 $(foreach s,$(CC_SUFFIXES),$(a)-$(s)-)))
21 endif
22 endif
23
24 HAS_BIARCH := $(call cc-option-yn, -m32)
25
26 # Set default 32 bits cross compilers for vdso and boot wrapper
27 CROSS32_COMPILE ?=
28
29 # If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
30 # ppc64le_defconfig because we have nothing better to go on.
31 uname := $(shell uname -m)
32 KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64le)_defconfig
33
34 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
35
36 ifeq ($(new_nm),y)
37 NM := $(NM) --synthetic
38 endif
39
40 # BITS is used as extension for files which are available in a 32 bit
41 # and a 64 bit version to simplify shared Makefiles.
42 # e.g.: obj-y += foo_$(BITS).o
43 export BITS
44
45 ifdef CONFIG_PPC64
46 BITS := 64
47 else
48 BITS := 32
49 endif
50
51 machine-y = ppc
52 machine-$(CONFIG_PPC64) += 64
53 machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
54 UTS_MACHINE := $(subst $(space),,$(machine-y))
55
56 ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
57 # Have the linker provide sfpr if possible.
58 # There is a corresponding test in arch/powerpc/lib/Makefile
59 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
60 else
61 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
62 endif
63
64 ifdef CONFIG_CPU_LITTLE_ENDIAN
65 KBUILD_CFLAGS += -mlittle-endian
66 KBUILD_LDFLAGS += -EL
67 LDEMULATION := lppc
68 GNUTARGET := powerpcle
69 MULTIPLEWORD := -mno-multiple
70 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
71 else
72 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
73 KBUILD_LDFLAGS += -EB
74 LDEMULATION := ppc
75 GNUTARGET := powerpc
76 MULTIPLEWORD := -mmultiple
77 endif
78
79 ifdef CONFIG_PPC64
80 ifndef CONFIG_CC_IS_CLANG
81 cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
82 cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
83 aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
84 aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
85 endif
86 endif
87
88 ifndef CONFIG_CC_IS_CLANG
89 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
90 endif
91
92 cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
93 cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
94 aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
95 aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
96
97 ifeq ($(HAS_BIARCH),y)
98 KBUILD_CFLAGS += -m$(BITS)
99 KBUILD_AFLAGS += -m$(BITS)
100 KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
101 endif
102
103 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
104 ifdef CONFIG_PPC64
105 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
106 else
107 cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
108 endif
109
110 LDFLAGS_vmlinux-y := -Bstatic
111 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
112 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
113 LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
114
115 ifdef CONFIG_PPC64
116 ifndef CONFIG_PPC_KERNEL_PCREL
117 # -mcmodel=medium breaks modules because it uses 32bit offsets from
118 # the TOC pointer to create pointers where possible. Pointers into the
119 # percpu data area are created by this method.
120 #
121 # The kernel module loader relocates the percpu data section from the
122 # original location (starting with 0xd...) to somewhere in the base
123 # kernel percpu data space (starting with 0xc...). We need a full
124 # 64bit relocation for this to work, hence -mcmodel=large.
125 KBUILD_CFLAGS_MODULE += -mcmodel=large
126 endif
127 endif
128
129 CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
130 ifdef CONFIG_PPC64_ELF_ABI_V2
131 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
132 else
133 ifndef CONFIG_CC_IS_CLANG
134 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
135 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
136 endif
137 endif
138 CFLAGS-$(CONFIG_PPC64) += -mcmodel=medium
139 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
140 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mlong-double-128)
141
142 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
143 # https://llvm.org/pr39555
144 CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)
145
146 # Clang doesn't support -mmultiple / -mno-multiple
147 # https://llvm.org/pr39556
148 CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))
149
150 CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)
151
152 CC_FLAGS_FPU := $(call cc-option,-mhard-float)
153 CC_FLAGS_NO_FPU := $(call cc-option,-msoft-float)
154
155 ifdef CONFIG_FUNCTION_TRACER
156 ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY
157 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
158 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
159 else
160 CC_FLAGS_FTRACE := -pg
161 ifdef CONFIG_MPROFILE_KERNEL
162 CC_FLAGS_FTRACE += -mprofile-kernel
163 endif
164 endif
165 endif
166
167 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
168 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
169
170 CFLAGS-y += $(CONFIG_TUNE_CPU)
171
172 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
173
174 KBUILD_CPPFLAGS += -I $(srctree)/arch/powerpc $(asinstr)
175 KBUILD_AFLAGS += $(AFLAGS-y)
176 KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU)
177 KBUILD_CFLAGS += $(CFLAGS-y)
178 CPP = $(CC) -E $(KBUILD_CFLAGS)
179
180 CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
181 ifdef CONFIG_CPU_BIG_ENDIAN
182 CHECKFLAGS += -D__BIG_ENDIAN__
183 else
184 CHECKFLAGS += -D__LITTLE_ENDIAN__
185 endif
186
187 ifdef CONFIG_476FPE_ERR46
188 KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
189 -T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
190 endif
191
192 # No prefix or pcrel
193 ifdef CONFIG_PPC_KERNEL_PREFIXED
194 KBUILD_CFLAGS += $(call cc-option,-mprefixed)
195 else
196 KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
197 endif
198 ifdef CONFIG_PPC_KERNEL_PCREL
199 KBUILD_CFLAGS += $(call cc-option,-mpcrel)
200 else
201 KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
202 endif
203
204 # No AltiVec or VSX or MMA instructions when building kernel
205 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
206 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
207 KBUILD_CFLAGS += $(call cc-option,-mno-mma)
208
209 # No SPE instruction when building kernel
210 # (We use all available options to help semi-broken compilers)
211 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
212 KBUILD_CFLAGS += $(call cc-option,-mspe=no)
213
214 # Don't emit .eh_frame since we have no use for it
215 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
216
217 # Never use string load/store instructions as they are
218 # often slow when they are implemented at all
219 KBUILD_CFLAGS += $(call cc-option,-mno-string)
220
221 KBUILD_AFLAGS += $(aflags-y)
222 KBUILD_CFLAGS += $(cflags-y)
223
224 # Default to zImage, override when needed
225 all: zImage
226
227 # With make 3.82 we cannot mix normal and wildcard targets
228 BOOT_TARGETS1 := zImage zImage.initrd uImage
229 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%
230
231 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
232
233 boot := arch/powerpc/boot
234
235 $(BOOT_TARGETS1): vmlinux
236 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
237 $(BOOT_TARGETS2): vmlinux
238 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
239
240
241 PHONY += bootwrapper_install
242 bootwrapper_install:
243 $(Q)$(MAKE) $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
244
245 include $(srctree)/scripts/Makefile.defconf
246
247 generated_configs += ppc64le_defconfig
248 ppc64le_defconfig:
249 $(call merge_into_defconfig,ppc64_defconfig,le)
250
251 generated_configs += ppc64le_guest_defconfig
252 ppc64le_guest_defconfig:
253 $(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest)
254
255 generated_configs += ppc64_guest_defconfig
256 ppc64_guest_defconfig:
257 $(call merge_into_defconfig,ppc64_defconfig,be guest kvm_guest)
258
259 generated_configs += pseries_le_defconfig
260 pseries_le_defconfig: ppc64le_guest_defconfig
261
262 generated_configs += pseries_defconfig
263 pseries_defconfig: ppc64le_guest_defconfig
264
265 generated_configs += powernv_be_defconfig
266 powernv_be_defconfig:
267 $(call merge_into_defconfig,powernv_defconfig,be)
268
269 generated_configs += mpc85xx_defconfig
270 mpc85xx_defconfig:
271 $(call merge_into_defconfig,mpc85xx_base.config,\
272 85xx-32bit 85xx-hw fsl-emb-nonhw)
273
274 generated_configs += mpc85xx_smp_defconfig
275 mpc85xx_smp_defconfig:
276 $(call merge_into_defconfig,mpc85xx_base.config,\
277 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)
278
279 generated_configs += corenet32_smp_defconfig
280 corenet32_smp_defconfig:
281 $(call merge_into_defconfig,corenet_base.config,\
282 85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)
283
284 generated_configs += corenet64_smp_defconfig
285 corenet64_smp_defconfig:
286 $(call merge_into_defconfig,corenet_base.config,\
287 85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)
288
289 generated_configs += mpc86xx_defconfig
290 mpc86xx_defconfig:
291 $(call merge_into_defconfig,mpc86xx_base.config,\
292 86xx-hw fsl-emb-nonhw)
293
294 generated_configs += mpc86xx_smp_defconfig
295 mpc86xx_smp_defconfig:
296 $(call merge_into_defconfig,mpc86xx_base.config,\
297 86xx-smp 86xx-hw fsl-emb-nonhw)
298
299 generated_configs += ppc32_allmodconfig
300 ppc32_allmodconfig:
301 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
302 -f $(srctree)/Makefile allmodconfig
303
304 generated_configs += ppc44x_allmodconfig
305 ppc44x_allmodconfig:
306 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/44x.config \
307 -f $(srctree)/Makefile allmodconfig
308
309 generated_configs += ppc8xx_allmodconfig
310 ppc8xx_allmodconfig:
311 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/8xx.config \
312 -f $(srctree)/Makefile allmodconfig
313
314 generated_configs += ppc85xx_allmodconfig
315 ppc85xx_allmodconfig:
316 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-32bit.config \
317 -f $(srctree)/Makefile allmodconfig
318
319 generated_configs += ppc_defconfig
320 ppc_defconfig:
321 $(call merge_into_defconfig,book3s_32.config,)
322
323 generated_configs += ppc64le_allmodconfig
324 ppc64le_allmodconfig:
325 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
326 -f $(srctree)/Makefile allmodconfig
327
328 generated_configs += ppc64le_allnoconfig
329 ppc64le_allnoconfig:
330 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
331 -f $(srctree)/Makefile allnoconfig
332
333 generated_configs += ppc64_book3e_allmodconfig
334 ppc64_book3e_allmodconfig:
335 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
336 -f $(srctree)/Makefile allmodconfig
337
338 generated_configs += ppc32_randconfig
339 ppc32_randconfig:
340 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
341 -f $(srctree)/Makefile randconfig
342
343 generated_configs += ppc64_randconfig
344 ppc64_randconfig:
345 $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
346 -f $(srctree)/Makefile randconfig
347
348 PHONY += $(generated_configs)
349
350 define archhelp
351 echo '* zImage - Build default images selected by kernel config'
352 echo ' zImage.* - Compressed kernel image (arch/powerpc/boot/zImage.*)'
353 echo ' uImage - U-Boot native image format'
354 echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
355 echo ' versions which do not support device trees'
356 echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
357 echo ' simpleImage.<dt> - Firmware independent image.'
358 echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
359 echo ' install - Install kernel using'
360 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
361 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
362 echo ' install to $$(INSTALL_PATH) and run lilo'
363 echo ' *_defconfig - Select default config from arch/powerpc/configs'
364 echo ''
365 echo ' Targets with <dt> embed a device tree blob inside the image'
366 echo ' These targets support board with firmware that does not'
367 echo ' support passing a device tree directly. Replace <dt> with the'
368 echo ' name of a dts file from the arch/powerpc/boot/dts/ directory'
369 echo ' (minus the .dts extension).'
370 echo
371 $(foreach cfg,$(generated_configs),
372 printf " %-27s - Build for %s\\n" $(cfg) $(subst _defconfig,,$(cfg));)
373 endef
374
375 PHONY += install
376 install:
377 $(call cmd,install)
378
379 ifeq ($(KBUILD_EXTMOD),)
380 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
381 # In order to do that, we should use the archprepare target, but we can't since
382 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
383 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
384 # Therefore we need to generate the header after prepare0 has been made, hence
385 # this hack.
386 prepare: vdso_prepare
387 vdso_prepare: prepare0
388 $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
389 $(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
390 $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
391 $(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
392 endif
393
394 archprepare: checkbin
395
396 archheaders:
397 $(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
398
399 ifdef CONFIG_STACKPROTECTOR
400 prepare: stack_protector_prepare
401
402 PHONY += stack_protector_prepare
403 stack_protector_prepare: prepare0
404 ifdef CONFIG_PPC64
405 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
406 else
407 $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
408 endif
409 endif
410
411 PHONY += checkbin
412 checkbin:
413 @if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
414 "x${CONFIG_LD_IS_BFD}" = "xy" -a \
415 "${CONFIG_LD_VERSION}" = "23700" ; then \
416 echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
417 echo 'is unable to handle.' ; \
418 echo '*** Please use a different binutils version.' ; \
419 false ; \
420 fi
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.