1 # SPDX-License-Identifier: GPL-2.0
2 # Unified Makefile for i386 and x86_64
3
4 # select defconfig based on actual architectur
5 ifeq ($(ARCH),x86)
6 ifeq ($(shell uname -m | sed -e 's/i.86/i386
7 KBUILD_DEFCONFIG := i386_defconfig
8 else
9 KBUILD_DEFCONFIG := x86_64_defconfig
10 endif
11 else
12 KBUILD_DEFCONFIG := $(ARCH)_defconfig
13 endif
14
15 ifdef CONFIG_CC_IS_GCC
16 RETPOLINE_CFLAGS := $(call cc-option,-m
17 RETPOLINE_VDSO_CFLAGS := $(call cc-option,-m
18 endif
19 ifdef CONFIG_CC_IS_CLANG
20 RETPOLINE_CFLAGS := -mretpoline-externa
21 RETPOLINE_VDSO_CFLAGS := -mretpoline
22 endif
23 RETPOLINE_CFLAGS += $(call cc-option,-m
24
25 ifdef CONFIG_MITIGATION_RETHUNK
26 RETHUNK_CFLAGS := -mfunction-return=t
27 RETHUNK_RUSTFLAGS := -Zfunction-return=t
28 RETPOLINE_CFLAGS += $(RETHUNK_CFLAGS)
29 RETPOLINE_RUSTFLAGS += $(RETHUNK_RUSTFLAGS
30 endif
31
32 export RETHUNK_CFLAGS
33 export RETHUNK_RUSTFLAGS
34 export RETPOLINE_CFLAGS
35 export RETPOLINE_RUSTFLAGS
36 export RETPOLINE_VDSO_CFLAGS
37
38 # For gcc stack alignment is specified with -m
39 # clang has the option -mstack-alignment for t
40 ifneq ($(call cc-option, -mpreferred-stack-bou
41 cc_stack_align4 := -mpreferred-stack-bou
42 cc_stack_align8 := -mpreferred-stack-bou
43 else ifneq ($(call cc-option, -mstack-alignmen
44 cc_stack_align4 := -mstack-alignment=4
45 cc_stack_align8 := -mstack-alignment=8
46 endif
47
48 # How to compile the 16-bit code. Note we alw
49 # that way we can complain to the user if the
50 REALMODE_CFLAGS := -std=gnu11 -m16 -g -Os -DDI
51 -Wall -Wstrict-prototypes -
52 -fno-strict-aliasing -fomit
53 -mno-mmx -mno-sse $(call cc
54
55 REALMODE_CFLAGS += -ffreestanding
56 REALMODE_CFLAGS += -fno-stack-protector
57 REALMODE_CFLAGS += -Wno-address-of-packed-memb
58 REALMODE_CFLAGS += $(cc_stack_align4)
59 REALMODE_CFLAGS += $(CLANG_FLAGS)
60 ifdef CONFIG_CC_IS_CLANG
61 REALMODE_CFLAGS += -Wno-gnu
62 endif
63 export REALMODE_CFLAGS
64
65 # BITS is used as extension for files which ar
66 # and a 64 bit version to simplify shared Make
67 # e.g.: obj-y += foo_$(BITS).o
68 export BITS
69
70 #
71 # Prevent GCC from generating any FP code by m
72 #
73 # This must happen before we try the -mpreferr
74 #
75 # https://gcc.gnu.org/bugzilla/show_bug.cgi
76 #
77 KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -
78 KBUILD_RUSTFLAGS += --target=$(objtree)/script
79 KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse
80
81 #
82 # CFLAGS for compiling floating point code ins
83 #
84 CC_FLAGS_FPU := -msse -msse2
85 ifdef CONFIG_CC_IS_GCC
86 # Stack alignment mismatch, proceed with cauti
87 # GCC < 7.1 cannot compile code using `double`
88 # (8B stack alignment).
89 # See https://gcc.gnu.org/bugzilla/show_bug.cg
90 #
91 # The "-msse" in the first argument is there s
92 # -mpreferred-stack-boundary=3 build error:
93 #
94 # -mpreferred-stack-boundary=3 is not between
95 #
96 # can be triggered. Otherwise gcc doesn't comp
97 CC_FLAGS_FPU += -mhard-float
98 CC_FLAGS_FPU += $(call cc-option,-msse -mprefe
99 endif
100
101 ifeq ($(CONFIG_X86_KERNEL_IBT),y)
102 #
103 # Kernel IBT has S_CET.NOTRACK_EN=0, as such t
104 # NOTRACK prefixes. Current generation compile
105 # for jump-tables, as such, disable jump-table
106 #
107 # (jump-tables are implicitly disabled by RETP
108 #
109 # https://gcc.gnu.org/bugzilla/show_bug.cgi?
110 #
111 KBUILD_CFLAGS += $(call cc-option,-fcf-protect
112 KBUILD_RUSTFLAGS += -Zcf-protection=branch -Zn
113 else
114 KBUILD_CFLAGS += $(call cc-option,-fcf-protect
115 endif
116
117 ifeq ($(CONFIG_X86_32),y)
118 BITS := 32
119 UTS_MACHINE := i386
120 CHECKFLAGS += -D__i386__
121
122 KBUILD_AFLAGS += -m32
123 KBUILD_CFLAGS += -m32
124
125 KBUILD_CFLAGS += -msoft-float -mregpar
126
127 # Never want PIC in a 32-bit kernel, p
128 # with nonstandard options
129 KBUILD_CFLAGS += -fno-pic
130
131 # Align the stack to the register widt
132 # alignment of 16 bytes. This reduces
133 # alignment instructions.
134 KBUILD_CFLAGS += $(cc_stack_align4)
135
136 # CPU-specific tuning. Anything which
137 include $(srctree)/arch/x86/Makefile_3
138 KBUILD_CFLAGS += $(cflags-y)
139
140 # temporary until string.h is fixed
141 KBUILD_CFLAGS += -ffreestanding
142
143 ifeq ($(CONFIG_STACKPROTECTOR),y)
144 ifeq ($(CONFIG_SMP),y)
145 KBUILD_CFLAGS += -msta
146 else
147 KBUILD_CFLAGS += -msta
148 endif
149 endif
150 else
151 BITS := 64
152 UTS_MACHINE := x86_64
153 CHECKFLAGS += -D__x86_64__
154
155 KBUILD_AFLAGS += -m64
156 KBUILD_CFLAGS += -m64
157
158 # Align jump targets to 1 byte, not th
159 KBUILD_CFLAGS += $(call cc-option,-fal
160
161 # Pack loops tightly as well:
162 KBUILD_CFLAGS += $(call cc-option,-fal
163
164 # Don't autogenerate traditional x87 i
165 KBUILD_CFLAGS += -mno-80387
166 KBUILD_CFLAGS += $(call cc-option,-mno
167
168 # By default gcc and clang use a stack
169 # However the standard kernel entry on
170 # 8-byte boundary. If the compiler isn
171 # alignment it will generate extra ali
172 # default alignment which keep the sta
173 # Furthermore an alignment to the regi
174 # and the number of alignment instruct
175 KBUILD_CFLAGS += $(cc_stack_align8)
176
177 # Use -mskip-rax-setup if supported.
178 KBUILD_CFLAGS += $(call cc-option,-msk
179
180 # FIXME - should be integrated in Make
181 cflags-$(CONFIG_MK8) += -ma
182 cflags-$(CONFIG_MPSC) += -ma
183 cflags-$(CONFIG_MCORE2) += -ma
184 cflags-$(CONFIG_MATOM) += -ma
185 cflags-$(CONFIG_GENERIC_CPU) += -mt
186 KBUILD_CFLAGS += $(cflags-y)
187
188 rustflags-$(CONFIG_MK8) += -Ct
189 rustflags-$(CONFIG_MPSC) += -Ct
190 rustflags-$(CONFIG_MCORE2) += -Ct
191 rustflags-$(CONFIG_MATOM) += -Ct
192 rustflags-$(CONFIG_GENERIC_CPU) += -Zt
193 KBUILD_RUSTFLAGS += $(rustflags-y)
194
195 KBUILD_CFLAGS += -mno-red-zone
196 KBUILD_CFLAGS += -mcmodel=kernel
197 KBUILD_RUSTFLAGS += -Cno-redzone=y
198 KBUILD_RUSTFLAGS += -Ccode-model=kerne
199 endif
200
201 #
202 # If the function graph tracer is used with mc
203 # '-maccumulate-outgoing-args' is needed to pr
204 # (https://gcc.gnu.org/bugzilla/show_bug.cgi?i
205 #
206 ifdef CONFIG_FUNCTION_GRAPH_TRACER
207 ifndef CONFIG_HAVE_FENTRY
208 ACCUMULATE_OUTGOING_ARGS := 1
209 endif
210 endif
211
212 ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
213 # This compiler flag is not supported
214 KBUILD_CFLAGS += $(call cc-option,-mac
215 endif
216
217 # Workaround for a gcc prelease that unfortuna
218 KBUILD_CFLAGS += -Wno-sign-compare
219 #
220 KBUILD_CFLAGS += -fno-asynchronous-unwind-tabl
221
222 # Avoid indirect branches in kernel to deal wi
223 ifdef CONFIG_MITIGATION_RETPOLINE
224 KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
225 KBUILD_RUSTFLAGS += $(RETPOLINE_RUSTFLAGS)
226 # Additionally, avoid generating expensive i
227 # are subject to retpolines for small number
228 # LLVM turns off jump table generation by de
229 # retpoline builds, however, gcc does not fo
230 # only been fixed starting from gcc stable v
231 # onwards, but not for older ones. See gcc b
232 ifndef CONFIG_CC_IS_CLANG
233 KBUILD_CFLAGS += -fno-jump-tables
234 endif
235 endif
236
237 ifdef CONFIG_MITIGATION_SLS
238 KBUILD_CFLAGS += -mharden-sls=all
239 endif
240
241 ifdef CONFIG_CALL_PADDING
242 PADDING_CFLAGS := -fpatchable-function-entry=$
243 KBUILD_CFLAGS += $(PADDING_CFLAGS)
244 export PADDING_CFLAGS
245
246 PADDING_RUSTFLAGS := -Zpatchable-function-entr
247 KBUILD_RUSTFLAGS += $(PADDING_RUSTFLAGS)
248 export PADDING_RUSTFLAGS
249 endif
250
251 KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE)
252
253 ifdef CONFIG_X86_NEED_RELOCS
254 LDFLAGS_vmlinux := --emit-relocs --discard-non
255 else
256 LDFLAGS_vmlinux :=
257 endif
258
259 #
260 # The 64-bit kernel must be aligned to 2MB. P
261 # the linker to force 2MB page size regardless
262 # by the linker.
263 #
264 ifdef CONFIG_X86_64
265 LDFLAGS_vmlinux += -z max-page-size=0x200000
266 endif
267
268
269 archscripts: scripts_basic
270 $(Q)$(MAKE) $(build)=arch/x86/tools re
271
272 ###
273 # Syscall table generation
274
275 archheaders:
276 $(Q)$(MAKE) $(build)=arch/x86/entry/sy
277
278 ###
279 # Kernel objects
280
281 libs-y += arch/x86/lib/
282
283 # drivers-y are linked after core-y
284 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/m
285 drivers-$(CONFIG_PCI) += arch/x86/p
286
287 # suspend and hibernation support
288 drivers-$(CONFIG_PM) += arch/x86/power/
289
290 drivers-$(CONFIG_VIDEO) += arch/x86/video/
291
292 ####
293 # boot loader support. Several targets are kep
294
295 boot := arch/x86/boot
296
297 BOOT_TARGETS = bzdisk fdimage fdimage144 fdima
298
299 PHONY += bzImage $(BOOT_TARGETS)
300
301 # Default kernel to build
302 all: bzImage
303
304 # KBUILD_IMAGE specify target image being buil
305 KBUILD_IMAGE := $(boot)/bzImage
306
307 bzImage: vmlinux
308 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
309 $(Q)$(MAKE) $(build)=arch/x86/tools po
310 endif
311 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_
312 $(Q)mkdir -p $(objtree)/arch/$(UTS_MAC
313 $(Q)ln -fsn ../../x86/boot/bzImage $(o
314
315 $(BOOT_TARGETS): vmlinux
316 $(Q)$(MAKE) $(build)=$(boot) $@
317
318 PHONY += install
319 install:
320 $(call cmd,install)
321
322 vdso-install-$(CONFIG_X86_64) += arc
323 vdso-install-$(CONFIG_X86_X32_ABI) += arc
324 vdso-install-$(CONFIG_COMPAT_32) += arc
325
326 archprepare: checkbin
327 checkbin:
328 ifdef CONFIG_MITIGATION_RETPOLINE
329 ifeq ($(RETPOLINE_CFLAGS),)
330 @echo "You are building kernel with no
331 @echo "Please update your compiler." >
332 @false
333 endif
334 endif
335
336 ifdef CONFIG_UNWINDER_ORC
337 orc_hash_h := arch/$(SRCARCH)/include/generate
338 orc_hash_sh := $(srctree)/scripts/orc_hash.sh
339 targets += $(orc_hash_h)
340 quiet_cmd_orc_hash = GEN $@
341 cmd_orc_hash = mkdir -p $(dir $@); \
342 $(CONFIG_SHELL) $(orc_has
343 $(orc_hash_h): $(srctree)/arch/x86/include/asm
344 $(call if_changed,orc_hash)
345 archprepare: $(orc_hash_h)
346 endif
347
348 archclean:
349 $(Q)rm -rf $(objtree)/arch/i386
350 $(Q)rm -rf $(objtree)/arch/x86_64
351
352 define archhelp
353 echo '* bzImage - Compressed k
354 echo ' install - Install kern
355 echo ' (distributio
356 echo ' $$(INSTALL_P
357 echo ''
358 echo ' fdimage - Create 1.4MB
359 echo ' fdimage144 - Create 1.4MB
360 echo ' fdimage288 - Create 2.8MB
361 echo ' hdimage - Create a BIO
362 echo ' isoimage - Create a boo
363 echo ' bzdisk/fdima
364 echo ' FDARGS="..."
365 echo ' FDINITRD=fil
366
367 endef
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