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. | |
2838307b | 27 | REALMODE_CFLAGS := -m16 -g -Os -DDISABLE_BRANCH_PROFILING \ |
1c678da3 | 28 | -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \ |
1c678da3 | 29 | -fno-strict-aliasing -fomit-frame-pointer -fno-pic \ |
9fcb51c1 | 30 | -mno-mmx -mno-sse $(call cc-option,-fcf-protection=none) |
032a2c4f | 31 | |
685969e0 | 32 | REALMODE_CFLAGS += -ffreestanding |
893ab004 | 33 | REALMODE_CFLAGS += -fno-stack-protector |
989ceac7 ND |
34 | REALMODE_CFLAGS += -Wno-address-of-packed-member |
35 | REALMODE_CFLAGS += $(cc_stack_align4) | |
8abe7fc2 | 36 | REALMODE_CFLAGS += $(CLANG_FLAGS) |
1c678da3 DW |
37 | export REALMODE_CFLAGS |
38 | ||
0a6ef376 SR |
39 | # BITS is used as extension for files which are available in a 32 bit |
40 | # and a 64 bit version to simplify shared Makefiles. | |
41 | # e.g.: obj-y += foo_$(BITS).o | |
42 | export BITS | |
74b469f2 | 43 | |
b2c51106 AL |
44 | # |
45 | # Prevent GCC from generating any FP code by mistake. | |
46 | # | |
47 | # This must happen before we try the -mpreferred-stack-boundary, see: | |
48 | # | |
49 | # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 | |
50 | # | |
989ceac7 | 51 | KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx |
b2c51106 | 52 | |
256b92af BP |
53 | # Intel CET isn't enabled in the kernel |
54 | KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) | |
55 | ||
d746d647 | 56 | ifeq ($(CONFIG_X86_32),y) |
0a6ef376 | 57 | BITS := 32 |
8c6531f7 | 58 | UTS_MACHINE := i386 |
4ba7e5cd | 59 | CHECKFLAGS += -D__i386__ |
0a6ef376 | 60 | |
989ceac7 ND |
61 | KBUILD_AFLAGS += -m32 |
62 | KBUILD_CFLAGS += -m32 | |
0a6ef376 | 63 | |
0a6ef376 SR |
64 | KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return |
65 | ||
484d90ee AB |
66 | # Never want PIC in a 32-bit kernel, prevent breakage with GCC built |
67 | # with nonstandard options | |
68 | KBUILD_CFLAGS += -fno-pic | |
69 | ||
d77698df MK |
70 | # Align the stack to the register width instead of using the default |
71 | # alignment of 16 bytes. This reduces stack usage and the number of | |
72 | # alignment instructions. | |
989ceac7 | 73 | KBUILD_CFLAGS += $(cc_stack_align4) |
0a6ef376 | 74 | |
0a6ef376 | 75 | # CPU-specific tuning. Anything which can be shared with UML should go here. |
a436bb7b | 76 | include arch/x86/Makefile_32.cpu |
0a6ef376 SR |
77 | KBUILD_CFLAGS += $(cflags-y) |
78 | ||
79 | # temporary until string.h is fixed | |
80 | KBUILD_CFLAGS += -ffreestanding | |
3fb0fdb3 AL |
81 | |
82 | ifeq ($(CONFIG_STACKPROTECTOR),y) | |
83 | ifeq ($(CONFIG_SMP),y) | |
84 | KBUILD_CFLAGS += -mstack-protector-guard-reg=fs -mstack-protector-guard-symbol=__stack_chk_guard | |
85 | else | |
86 | KBUILD_CFLAGS += -mstack-protector-guard=global | |
87 | endif | |
88 | endif | |
74b469f2 | 89 | else |
0a6ef376 | 90 | BITS := 64 |
8c6531f7 | 91 | UTS_MACHINE := x86_64 |
1f2f01b1 | 92 | CHECKFLAGS += -D__x86_64__ |
0a6ef376 SR |
93 | |
94 | KBUILD_AFLAGS += -m64 | |
95 | KBUILD_CFLAGS += -m64 | |
96 | ||
be6cb027 | 97 | # Align jump targets to 1 byte, not the default 16 bytes: |
2c4fd1ac | 98 | KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1) |
be6cb027 | 99 | |
52648e83 | 100 | # Pack loops tightly as well: |
2c4fd1ac | 101 | KBUILD_CFLAGS += $(call cc-option,-falign-loops=1) |
52648e83 | 102 | |
5c630089 | 103 | # Don't autogenerate traditional x87 instructions |
989ceac7 | 104 | KBUILD_CFLAGS += -mno-80387 |
8f2dd677 | 105 | KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387) |
5551a34e | 106 | |
d77698df MK |
107 | # By default gcc and clang use a stack alignment of 16 bytes for x86. |
108 | # However the standard kernel entry on x86-64 leaves the stack on an | |
109 | # 8-byte boundary. If the compiler isn't informed about the actual | |
110 | # alignment it will generate extra alignment instructions for the | |
111 | # default alignment which keep the stack *mis*aligned. | |
112 | # Furthermore an alignment to the register width reduces stack usage | |
113 | # and the number of alignment instructions. | |
989ceac7 | 114 | KBUILD_CFLAGS += $(cc_stack_align8) |
d9b0cde9 | 115 | |
d9ee948d L |
116 | # Use -mskip-rax-setup if supported. |
117 | KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) | |
118 | ||
0a6ef376 | 119 | # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) |
989ceac7 ND |
120 | cflags-$(CONFIG_MK8) += -march=k8 |
121 | cflags-$(CONFIG_MPSC) += -march=nocona | |
122 | cflags-$(CONFIG_MCORE2) += -march=core2 | |
123 | cflags-$(CONFIG_MATOM) += -march=atom | |
124 | cflags-$(CONFIG_GENERIC_CPU) += -mtune=generic | |
0a6ef376 SR |
125 | KBUILD_CFLAGS += $(cflags-y) |
126 | ||
127 | KBUILD_CFLAGS += -mno-red-zone | |
128 | KBUILD_CFLAGS += -mcmodel=kernel | |
5d707e9c | 129 | endif |
0a6ef376 | 130 | |
0bf62763 PA |
131 | ifdef CONFIG_X86_X32 |
132 | x32_ld_ok := $(call try-run,\ | |
133 | /bin/echo -e '1: .quad 1b' | \ | |
b1e0d8b7 | 134 | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ |
e3456056 MY |
135 | $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMP.o" && \ |
136 | $(LD) -m elf32_x86_64 "$$TMP.o" -o "$$TMP",y,n) | |
8bd69c2d IM |
137 | ifeq ($(x32_ld_ok),y) |
138 | CONFIG_X86_X32_ABI := y | |
139 | KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI | |
140 | KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI | |
141 | else | |
142 | $(warning CONFIG_X86_X32 enabled but no binutils support) | |
143 | endif | |
0bf62763 PA |
144 | endif |
145 | export CONFIG_X86_X32_ABI | |
146 | ||
3f135e57 JP |
147 | # |
148 | # If the function graph tracer is used with mcount instead of fentry, | |
149 | # '-maccumulate-outgoing-args' is needed to prevent a GCC bug | |
150 | # (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109) | |
151 | # | |
152 | ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
153 | ifndef CONFIG_HAVE_FENTRY | |
154 | ACCUMULATE_OUTGOING_ARGS := 1 | |
3f135e57 JP |
155 | endif |
156 | endif | |
157 | ||
3f135e57 | 158 | ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1) |
4a1bec46 ND |
159 | # This compiler flag is not supported by Clang: |
160 | KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,) | |
3f135e57 JP |
161 | endif |
162 | ||
25dfeeb7 SR |
163 | # Workaround for a gcc prelease that unfortunately was shipped in a suse release |
164 | KBUILD_CFLAGS += -Wno-sign-compare | |
165 | # | |
166 | KBUILD_CFLAGS += -fno-asynchronous-unwind-tables | |
0a6ef376 | 167 | |
76b04384 DW |
168 | # Avoid indirect branches in kernel to deal with Spectre |
169 | ifdef CONFIG_RETPOLINE | |
4cd24de3 | 170 | KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) |
ce02ef06 DB |
171 | # Additionally, avoid generating expensive indirect jumps which |
172 | # are subject to retpolines for small number of switch cases. | |
173 | # clang turns off jump table generation by default when under | |
a9d57ef1 DB |
174 | # retpoline builds, however, gcc does not for x86. This has |
175 | # only been fixed starting from gcc stable version 8.4.0 and | |
176 | # onwards, but not for older ones. See gcc bug #86952. | |
177 | ifndef CONFIG_CC_IS_CLANG | |
989ceac7 | 178 | KBUILD_CFLAGS += -fno-jump-tables |
a9d57ef1 | 179 | endif |
76b04384 DW |
180 | endif |
181 | ||
0024430e NC |
182 | KBUILD_LDFLAGS += -m elf_$(UTS_MACHINE) |
183 | ||
184 | ifdef CONFIG_LTO_CLANG | |
2398ce80 TV |
185 | ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) |
186 | KBUILD_LDFLAGS += -plugin-opt=-stack-alignment=$(if $(CONFIG_X86_32),4,8) | |
187 | endif | |
0024430e | 188 | endif |
587af649 AS |
189 | |
190 | ifdef CONFIG_X86_NEED_RELOCS | |
191 | LDFLAGS_vmlinux := --emit-relocs --discard-none | |
192 | else | |
193 | LDFLAGS_vmlinux := | |
194 | endif | |
195 | ||
196 | # | |
197 | # The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to | |
198 | # the linker to force 2MB page size regardless of the default page size used | |
199 | # by the linker. | |
200 | # | |
201 | ifdef CONFIG_X86_64 | |
202 | LDFLAGS_vmlinux += -z max-page-size=0x200000 | |
203 | endif | |
204 | ||
83109d5d | 205 | |
3ce9e53e | 206 | archscripts: scripts_basic |
6520fe55 PA |
207 | $(Q)$(MAKE) $(build)=arch/x86/tools relocs |
208 | ||
303395ac PA |
209 | ### |
210 | # Syscall table generation | |
211 | ||
212 | archheaders: | |
1f57d5d8 | 213 | $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all |
303395ac | 214 | |
0a6ef376 SR |
215 | ### |
216 | # Kernel objects | |
217 | ||
700efc1b EB |
218 | head-y := arch/x86/kernel/head_$(BITS).o |
219 | head-y += arch/x86/kernel/head$(BITS).o | |
f2d85299 | 220 | head-y += arch/x86/kernel/ebda.o |
8d152e7a | 221 | head-y += arch/x86/kernel/platform-quirks.o |
0a6ef376 SR |
222 | |
223 | libs-y += arch/x86/lib/ | |
224 | ||
0a6ef376 SR |
225 | # drivers-y are linked after core-y |
226 | drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ | |
227 | drivers-$(CONFIG_PCI) += arch/x86/pci/ | |
228 | ||
cf7700fe | 229 | # suspend and hibernation support |
0a6ef376 | 230 | drivers-$(CONFIG_PM) += arch/x86/power/ |
cf7700fe | 231 | |
0a6ef376 | 232 | drivers-$(CONFIG_FB) += arch/x86/video/ |
0a6ef376 SR |
233 | |
234 | #### | |
235 | # boot loader support. Several targets are kept for legacy purposes | |
236 | ||
237 | boot := arch/x86/boot | |
238 | ||
f279b49f | 239 | BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 hdimage isoimage |
f9c5107c PA |
240 | |
241 | PHONY += bzImage $(BOOT_TARGETS) | |
0a6ef376 SR |
242 | |
243 | # Default kernel to build | |
244 | all: bzImage | |
245 | ||
246 | # KBUILD_IMAGE specify target image being built | |
f9c5107c | 247 | KBUILD_IMAGE := $(boot)/bzImage |
0a6ef376 | 248 | |
f9c5107c | 249 | bzImage: vmlinux |
ca0e9bad MH |
250 | ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) |
251 | $(Q)$(MAKE) $(build)=arch/x86/tools posttest | |
252 | endif | |
0a6ef376 SR |
253 | $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) |
254 | $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot | |
41b3eae6 | 255 | $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ |
0a6ef376 | 256 | |
f9c5107c PA |
257 | $(BOOT_TARGETS): vmlinux |
258 | $(Q)$(MAKE) $(build)=$(boot) $@ | |
0a6ef376 | 259 | |
30ce434e MY |
260 | PHONY += install bzlilo |
261 | install bzlilo: | |
1648e4f8 PA |
262 | $(Q)$(MAKE) $(build)=$(boot) $@ |
263 | ||
0a6ef376 SR |
264 | PHONY += vdso_install |
265 | vdso_install: | |
d603c8e1 | 266 | $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@ |
0a6ef376 | 267 | |
829fe4aa BH |
268 | archprepare: checkbin |
269 | checkbin: | |
e9666d10 | 270 | ifndef CONFIG_CC_HAS_ASM_GOTO |
829fe4aa BH |
271 | @echo Compiler lacks asm-goto support. |
272 | @exit 1 | |
273 | endif | |
25896d07 MY |
274 | ifdef CONFIG_RETPOLINE |
275 | ifeq ($(RETPOLINE_CFLAGS),) | |
276 | @echo "You are building kernel with non-retpoline compiler." >&2 | |
277 | @echo "Please update your compiler." >&2 | |
278 | @false | |
279 | endif | |
280 | endif | |
829fe4aa | 281 | |
0a6ef376 SR |
282 | archclean: |
283 | $(Q)rm -rf $(objtree)/arch/i386 | |
284 | $(Q)rm -rf $(objtree)/arch/x86_64 | |
285 | $(Q)$(MAKE) $(clean)=$(boot) | |
b2d668da | 286 | $(Q)$(MAKE) $(clean)=arch/x86/tools |
0a6ef376 SR |
287 | |
288 | define archhelp | |
ac5d0887 BP |
289 | echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' |
290 | echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or' | |
291 | echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to ' | |
292 | echo ' $$(INSTALL_PATH) and run lilo' | |
293 | echo '' | |
294 | echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' | |
295 | echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' | |
296 | echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' | |
f279b49f | 297 | echo ' hdimage - Create a BIOS/EFI hard disk image (arch/x86/boot/hdimage)' |
ac5d0887 | 298 | echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' |
f279b49f | 299 | echo ' bzdisk/fdimage*/hdimage/isoimage also accept:' |
ac5d0887 BP |
300 | echo ' FDARGS="..." arguments for the booted kernel' |
301 | echo ' FDINITRD=file initrd for the booted kernel' | |
302 | echo '' | |
303 | echo ' kvm_guest.config - Enable Kconfig items for running this kernel as a KVM guest' | |
304 | echo ' xen.config - Enable Kconfig items for running this kernel as a Xen guest' | |
fbaf0aa8 | 305 | |
0a6ef376 | 306 | endef |