Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
74b469f2 SR |
2 | # Unified Makefile for i386 and x86_64 |
3 | ||
2266cfd5 | 4 | # select defconfig based on actual architecture |
d746d647 | 5 | ifeq ($(ARCH),x86) |
ffee0de4 DW |
6 | ifeq ($(shell uname -m),x86_64) |
7 | KBUILD_DEFCONFIG := x86_64_defconfig | |
8 | else | |
d746d647 | 9 | KBUILD_DEFCONFIG := i386_defconfig |
ffee0de4 | 10 | endif |
d746d647 SR |
11 | else |
12 | KBUILD_DEFCONFIG := $(ARCH)_defconfig | |
13 | endif | |
2266cfd5 | 14 | |
d77698df MK |
15 | # For gcc stack alignment is specified with -mpreferred-stack-boundary, |
16 | # clang has the option -mstack-alignment for that purpose. | |
17 | ifneq ($(call cc-option, -mpreferred-stack-boundary=4),) | |
8f918697 MK |
18 | cc_stack_align4 := -mpreferred-stack-boundary=2 |
19 | cc_stack_align8 := -mpreferred-stack-boundary=3 | |
20 | else ifneq ($(call cc-option, -mstack-alignment=16),) | |
21 | cc_stack_align4 := -mstack-alignment=4 | |
22 | cc_stack_align8 := -mstack-alignment=8 | |
d77698df MK |
23 | endif |
24 | ||
1c678da3 DW |
25 | # How to compile the 16-bit code. Note we always compile for -march=i386; |
26 | # that way we can complain to the user if the CPU is insufficient. | |
de3accda DW |
27 | # |
28 | # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For | |
a9cfccee PA |
29 | # older versions of GCC, include an *assembly* header to make sure that |
30 | # gcc doesn't play any games behind our back. | |
31 | CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h | |
de3accda DW |
32 | M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS)) |
33 | ||
d6289f36 | 34 | REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \ |
1c678da3 | 35 | -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \ |
1c678da3 | 36 | -fno-strict-aliasing -fomit-frame-pointer -fno-pic \ |
032a2c4f MK |
37 | -mno-mmx -mno-sse |
38 | ||
685969e0 | 39 | REALMODE_CFLAGS += -ffreestanding |
893ab004 | 40 | REALMODE_CFLAGS += -fno-stack-protector |
42e0e954 | 41 | REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member) |
9e8730b1 | 42 | REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4)) |
1c678da3 DW |
43 | export REALMODE_CFLAGS |
44 | ||
0a6ef376 SR |
45 | # BITS is used as extension for files which are available in a 32 bit |
46 | # and a 64 bit version to simplify shared Makefiles. | |
47 | # e.g.: obj-y += foo_$(BITS).o | |
48 | export BITS | |
74b469f2 | 49 | |
b2c51106 AL |
50 | # |
51 | # Prevent GCC from generating any FP code by mistake. | |
52 | # | |
53 | # This must happen before we try the -mpreferred-stack-boundary, see: | |
54 | # | |
55 | # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 | |
56 | # | |
57 | KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow | |
58 | KBUILD_CFLAGS += $(call cc-option,-mno-avx,) | |
59 | ||
d746d647 | 60 | ifeq ($(CONFIG_X86_32),y) |
0a6ef376 | 61 | BITS := 32 |
8c6531f7 | 62 | UTS_MACHINE := i386 |
4ba7e5cd | 63 | CHECKFLAGS += -D__i386__ |
0a6ef376 | 64 | |
4ba7e5cd SR |
65 | biarch := $(call cc-option,-m32) |
66 | KBUILD_AFLAGS += $(biarch) | |
67 | KBUILD_CFLAGS += $(biarch) | |
0a6ef376 | 68 | |
0a6ef376 SR |
69 | KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return |
70 | ||
484d90ee AB |
71 | # Never want PIC in a 32-bit kernel, prevent breakage with GCC built |
72 | # with nonstandard options | |
73 | KBUILD_CFLAGS += -fno-pic | |
74 | ||
d77698df MK |
75 | # Align the stack to the register width instead of using the default |
76 | # alignment of 16 bytes. This reduces stack usage and the number of | |
77 | # alignment instructions. | |
9e8730b1 | 78 | KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4)) |
0a6ef376 | 79 | |
0a6ef376 | 80 | # CPU-specific tuning. Anything which can be shared with UML should go here. |
a436bb7b | 81 | include arch/x86/Makefile_32.cpu |
0a6ef376 SR |
82 | KBUILD_CFLAGS += $(cflags-y) |
83 | ||
84 | # temporary until string.h is fixed | |
85 | KBUILD_CFLAGS += -ffreestanding | |
74b469f2 | 86 | else |
0a6ef376 | 87 | BITS := 64 |
8c6531f7 | 88 | UTS_MACHINE := x86_64 |
1f2f01b1 | 89 | CHECKFLAGS += -D__x86_64__ |
0a6ef376 | 90 | |
14262d67 | 91 | biarch := -m64 |
0a6ef376 SR |
92 | KBUILD_AFLAGS += -m64 |
93 | KBUILD_CFLAGS += -m64 | |
94 | ||
be6cb027 | 95 | # Align jump targets to 1 byte, not the default 16 bytes: |
2c4fd1ac | 96 | KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1) |
be6cb027 | 97 | |
52648e83 | 98 | # Pack loops tightly as well: |
2c4fd1ac | 99 | KBUILD_CFLAGS += $(call cc-option,-falign-loops=1) |
52648e83 | 100 | |
5c630089 | 101 | # Don't autogenerate traditional x87 instructions |
8f2dd677 BW |
102 | KBUILD_CFLAGS += $(call cc-option,-mno-80387) |
103 | KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387) | |
5551a34e | 104 | |
d77698df MK |
105 | # By default gcc and clang use a stack alignment of 16 bytes for x86. |
106 | # However the standard kernel entry on x86-64 leaves the stack on an | |
107 | # 8-byte boundary. If the compiler isn't informed about the actual | |
108 | # alignment it will generate extra alignment instructions for the | |
109 | # default alignment which keep the stack *mis*aligned. | |
110 | # Furthermore an alignment to the register width reduces stack usage | |
111 | # and the number of alignment instructions. | |
9e8730b1 | 112 | KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8)) |
d9b0cde9 | 113 | |
d9ee948d L |
114 | # Use -mskip-rax-setup if supported. |
115 | KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) | |
116 | ||
0a6ef376 SR |
117 | # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) |
118 | cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) | |
119 | cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) | |
120 | ||
121 | cflags-$(CONFIG_MCORE2) += \ | |
122 | $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) | |
366d19e1 TD |
123 | cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ |
124 | $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) | |
0a6ef376 SR |
125 | cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) |
126 | KBUILD_CFLAGS += $(cflags-y) | |
127 | ||
128 | KBUILD_CFLAGS += -mno-red-zone | |
129 | KBUILD_CFLAGS += -mcmodel=kernel | |
5d707e9c | 130 | endif |
0a6ef376 | 131 | |
0bf62763 PA |
132 | ifdef CONFIG_X86_X32 |
133 | x32_ld_ok := $(call try-run,\ | |
134 | /bin/echo -e '1: .quad 1b' | \ | |
b1e0d8b7 | 135 | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ |
0bf62763 PA |
136 | $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ |
137 | $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) | |
8bd69c2d IM |
138 | ifeq ($(x32_ld_ok),y) |
139 | CONFIG_X86_X32_ABI := y | |
140 | KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI | |
141 | KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI | |
142 | else | |
143 | $(warning CONFIG_X86_X32 enabled but no binutils support) | |
144 | endif | |
0bf62763 PA |
145 | endif |
146 | export CONFIG_X86_X32_ABI | |
147 | ||
3f135e57 JP |
148 | # |
149 | # If the function graph tracer is used with mcount instead of fentry, | |
150 | # '-maccumulate-outgoing-args' is needed to prevent a GCC bug | |
151 | # (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109) | |
152 | # | |
153 | ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
154 | ifndef CONFIG_HAVE_FENTRY | |
155 | ACCUMULATE_OUTGOING_ARGS := 1 | |
156 | else | |
157 | ifeq ($(call cc-option-yn, -mfentry), n) | |
158 | ACCUMULATE_OUTGOING_ARGS := 1 | |
a5859c6d JP |
159 | |
160 | # GCC ignores '-maccumulate-outgoing-args' when used with '-Os'. | |
161 | # If '-Os' is enabled, disable it and print a warning. | |
162 | ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE | |
163 | undefine CONFIG_CC_OPTIMIZE_FOR_SIZE | |
7e609120 | 164 | $(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.) |
a5859c6d JP |
165 | endif |
166 | ||
3f135e57 JP |
167 | endif |
168 | endif | |
169 | endif | |
170 | ||
3f135e57 | 171 | ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1) |
4a1bec46 ND |
172 | # This compiler flag is not supported by Clang: |
173 | KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,) | |
3f135e57 JP |
174 | endif |
175 | ||
25dfeeb7 SR |
176 | # Workaround for a gcc prelease that unfortunately was shipped in a suse release |
177 | KBUILD_CFLAGS += -Wno-sign-compare | |
178 | # | |
179 | KBUILD_CFLAGS += -fno-asynchronous-unwind-tables | |
0a6ef376 | 180 | |
76b04384 DW |
181 | # Avoid indirect branches in kernel to deal with Spectre |
182 | ifdef CONFIG_RETPOLINE | |
4cd24de3 | 183 | KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) |
ce02ef06 DB |
184 | # Additionally, avoid generating expensive indirect jumps which |
185 | # are subject to retpolines for small number of switch cases. | |
186 | # clang turns off jump table generation by default when under | |
a9d57ef1 DB |
187 | # retpoline builds, however, gcc does not for x86. This has |
188 | # only been fixed starting from gcc stable version 8.4.0 and | |
189 | # onwards, but not for older ones. See gcc bug #86952. | |
190 | ifndef CONFIG_CC_IS_CLANG | |
191 | KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables) | |
192 | endif | |
76b04384 DW |
193 | endif |
194 | ||
587af649 AS |
195 | KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) |
196 | ||
197 | ifdef CONFIG_X86_NEED_RELOCS | |
198 | LDFLAGS_vmlinux := --emit-relocs --discard-none | |
199 | else | |
200 | LDFLAGS_vmlinux := | |
201 | endif | |
202 | ||
203 | # | |
204 | # The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to | |
205 | # the linker to force 2MB page size regardless of the default page size used | |
206 | # by the linker. | |
207 | # | |
208 | ifdef CONFIG_X86_64 | |
209 | LDFLAGS_vmlinux += -z max-page-size=0x200000 | |
210 | endif | |
211 | ||
83109d5d | 212 | |
3ce9e53e | 213 | archscripts: scripts_basic |
6520fe55 PA |
214 | $(Q)$(MAKE) $(build)=arch/x86/tools relocs |
215 | ||
303395ac PA |
216 | ### |
217 | # Syscall table generation | |
218 | ||
219 | archheaders: | |
1f57d5d8 | 220 | $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all |
303395ac | 221 | |
0a6ef376 SR |
222 | ### |
223 | # Kernel objects | |
224 | ||
700efc1b EB |
225 | head-y := arch/x86/kernel/head_$(BITS).o |
226 | head-y += arch/x86/kernel/head$(BITS).o | |
f2d85299 | 227 | head-y += arch/x86/kernel/ebda.o |
8d152e7a | 228 | head-y += arch/x86/kernel/platform-quirks.o |
0a6ef376 SR |
229 | |
230 | libs-y += arch/x86/lib/ | |
231 | ||
d1f0ae5e SR |
232 | # See arch/x86/Kbuild for content of core part of the kernel |
233 | core-y += arch/x86/ | |
0a6ef376 SR |
234 | |
235 | # drivers-y are linked after core-y | |
236 | drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ | |
237 | drivers-$(CONFIG_PCI) += arch/x86/pci/ | |
238 | ||
239 | # must be linked after kernel/ | |
240 | drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ | |
241 | ||
cf7700fe | 242 | # suspend and hibernation support |
0a6ef376 | 243 | drivers-$(CONFIG_PM) += arch/x86/power/ |
cf7700fe | 244 | |
0a6ef376 | 245 | drivers-$(CONFIG_FB) += arch/x86/video/ |
0a6ef376 SR |
246 | |
247 | #### | |
248 | # boot loader support. Several targets are kept for legacy purposes | |
249 | ||
250 | boot := arch/x86/boot | |
251 | ||
30ce434e | 252 | BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage |
f9c5107c PA |
253 | |
254 | PHONY += bzImage $(BOOT_TARGETS) | |
0a6ef376 SR |
255 | |
256 | # Default kernel to build | |
257 | all: bzImage | |
258 | ||
259 | # KBUILD_IMAGE specify target image being built | |
f9c5107c | 260 | KBUILD_IMAGE := $(boot)/bzImage |
0a6ef376 | 261 | |
f9c5107c | 262 | bzImage: vmlinux |
ca0e9bad MH |
263 | ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) |
264 | $(Q)$(MAKE) $(build)=arch/x86/tools posttest | |
265 | endif | |
0a6ef376 SR |
266 | $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) |
267 | $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot | |
41b3eae6 | 268 | $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ |
0a6ef376 | 269 | |
f9c5107c PA |
270 | $(BOOT_TARGETS): vmlinux |
271 | $(Q)$(MAKE) $(build)=$(boot) $@ | |
0a6ef376 | 272 | |
30ce434e MY |
273 | PHONY += install bzlilo |
274 | install bzlilo: | |
1648e4f8 PA |
275 | $(Q)$(MAKE) $(build)=$(boot) $@ |
276 | ||
0a6ef376 SR |
277 | PHONY += vdso_install |
278 | vdso_install: | |
d603c8e1 | 279 | $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@ |
0a6ef376 | 280 | |
829fe4aa BH |
281 | archprepare: checkbin |
282 | checkbin: | |
e9666d10 | 283 | ifndef CONFIG_CC_HAS_ASM_GOTO |
829fe4aa BH |
284 | @echo Compiler lacks asm-goto support. |
285 | @exit 1 | |
286 | endif | |
25896d07 MY |
287 | ifdef CONFIG_RETPOLINE |
288 | ifeq ($(RETPOLINE_CFLAGS),) | |
289 | @echo "You are building kernel with non-retpoline compiler." >&2 | |
290 | @echo "Please update your compiler." >&2 | |
291 | @false | |
292 | endif | |
293 | endif | |
829fe4aa | 294 | |
0a6ef376 SR |
295 | archclean: |
296 | $(Q)rm -rf $(objtree)/arch/i386 | |
297 | $(Q)rm -rf $(objtree)/arch/x86_64 | |
298 | $(Q)$(MAKE) $(clean)=$(boot) | |
b2d668da | 299 | $(Q)$(MAKE) $(clean)=arch/x86/tools |
0a6ef376 SR |
300 | |
301 | define archhelp | |
37f30e21 AK |
302 | echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' |
303 | echo ' install - Install kernel using' | |
caa27b66 SR |
304 | echo ' (your) ~/bin/$(INSTALLKERNEL) or' |
305 | echo ' (distribution) /sbin/$(INSTALLKERNEL) or' | |
37f30e21 AK |
306 | echo ' install to $$(INSTALL_PATH) and run lilo' |
307 | echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' | |
308 | echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' | |
309 | echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' | |
310 | echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' | |
311 | echo ' bzdisk/fdimage*/isoimage also accept:' | |
312 | echo ' FDARGS="..." arguments for the booted kernel' | |
313 | echo ' FDINITRD=file initrd for the booted kernel' | |
0a6ef376 | 314 | endef |