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1# Unified Makefile for i386 and x86_64
2
3# select defconfig based on actual architecture
4ifeq ($(ARCH),x86)
5 KBUILD_DEFCONFIG := i386_defconfig
6else
7 KBUILD_DEFCONFIG := $(ARCH)_defconfig
8endif
9
10# BITS is used as extension for files which are available in a 32 bit
11# and a 64 bit version to simplify shared Makefiles.
12# e.g.: obj-y += foo_$(BITS).o
13export BITS
14
15ifeq ($(CONFIG_X86_32),y)
16 BITS := 32
17 UTS_MACHINE := i386
18 CHECKFLAGS += -D__i386__
19
20 biarch := $(call cc-option,-m32)
21 KBUILD_AFLAGS += $(biarch)
22 KBUILD_CFLAGS += $(biarch)
23
24 ifdef CONFIG_RELOCATABLE
25 LDFLAGS_vmlinux := --emit-relocs
26 endif
27
28 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
29
30 # prevent gcc from keeping the stack 16 byte aligned
31 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
32
33 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
34 # a lot more stack due to the lack of sharing of stacklots:
35 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
36 $(call cc-option,-fno-unit-at-a-time))
37
38 # CPU-specific tuning. Anything which can be shared with UML should go here.
39 include $(srctree)/arch/x86/Makefile_32.cpu
40 KBUILD_CFLAGS += $(cflags-y)
41
42 # temporary until string.h is fixed
43 KBUILD_CFLAGS += -ffreestanding
44else
45 BITS := 64
46 UTS_MACHINE := x86_64
47 CHECKFLAGS += -D__x86_64__ -m64
48
49 KBUILD_AFLAGS += -m64
50 KBUILD_CFLAGS += -m64
51
52 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
53 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
54 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
55
56 cflags-$(CONFIG_MCORE2) += \
57 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
58 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
59 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
60 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
61 KBUILD_CFLAGS += $(cflags-y)
62
63 KBUILD_CFLAGS += -mno-red-zone
64 KBUILD_CFLAGS += -mcmodel=kernel
65
66 # -funit-at-a-time shrinks the kernel .text considerably
67 # unfortunately it makes reading oopses harder.
68 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
69
70 # this works around some issues with generating unwind tables in older gccs
71 # newer gccs do it by default
72 KBUILD_CFLAGS += -maccumulate-outgoing-args
73endif
74
75ifdef CONFIG_CC_STACKPROTECTOR
76 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
77 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
78 stackp-y := -fstack-protector
79 KBUILD_CFLAGS += $(stackp-y)
80 else
81 $(warning stack protector enabled but no compiler support)
82 endif
83endif
84
85ifdef CONFIG_X86_X32
86 x32_ld_ok := $(call try-run,\
87 /bin/echo -e '1: .quad 1b' | \
88 $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
89 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
90 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
91 ifeq ($(x32_ld_ok),y)
92 CONFIG_X86_X32_ABI := y
93 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
94 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
95 else
96 $(warning CONFIG_X86_X32 enabled but no binutils support)
97 endif
98endif
99export CONFIG_X86_X32_ABI
100
101# Don't unroll struct assignments with kmemcheck enabled
102ifeq ($(CONFIG_KMEMCHECK),y)
103 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
104endif
105
106# Stackpointer is addressed different for 32 bit and 64 bit x86
107sp-$(CONFIG_X86_32) := esp
108sp-$(CONFIG_X86_64) := rsp
109
110# do binutils support CFI?
111cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
112# is .cfi_signal_frame supported too?
113cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
114cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
115
116# does binutils support specific instructions?
117asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
118avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
119
120KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
121KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
122
123LDFLAGS := -m elf_$(UTS_MACHINE)
124
125# Speed up the build
126KBUILD_CFLAGS += -pipe
127# Workaround for a gcc prelease that unfortunately was shipped in a suse release
128KBUILD_CFLAGS += -Wno-sign-compare
129#
130KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
131# prevent gcc from generating any FP code by mistake
132KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
133KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
134
135KBUILD_CFLAGS += $(mflags-y)
136KBUILD_AFLAGS += $(mflags-y)
137
138archscripts:
139 $(Q)$(MAKE) $(build)=arch/x86/tools relocs
140
141###
142# Syscall table generation
143
144archheaders:
145 $(Q)$(MAKE) $(build)=arch/x86/syscalls all
146
147###
148# Kernel objects
149
150head-y := arch/x86/kernel/head_$(BITS).o
151head-y += arch/x86/kernel/head$(BITS).o
152head-y += arch/x86/kernel/head.o
153
154libs-y += arch/x86/lib
155
156# See arch/x86/Kbuild for content of core part of the kernel
157core-y += arch/x86/
158
159# drivers-y are linked after core-y
160drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
161drivers-$(CONFIG_PCI) += arch/x86/pci/
162
163# must be linked after kernel
164drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
165
166# suspend and hibernation support
167drivers-$(CONFIG_PM) += arch/x86/power/
168
169drivers-$(CONFIG_FB) += arch/x86/video/
170
171####
172# boot loader support. Several targets are kept for legacy purposes
173
174boot := arch/x86/boot
175
176BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
177
178PHONY += bzImage $(BOOT_TARGETS)
179
180# Default kernel to build
181all: bzImage
182
183# KBUILD_IMAGE specify target image being built
184KBUILD_IMAGE := $(boot)/bzImage
185
186bzImage: vmlinux
187ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
188 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
189endif
190 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
191 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
192 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
193
194$(BOOT_TARGETS): vmlinux
195 $(Q)$(MAKE) $(build)=$(boot) $@
196
197PHONY += install
198install:
199 $(Q)$(MAKE) $(build)=$(boot) $@
200
201PHONY += vdso_install
202vdso_install:
203 $(Q)$(MAKE) $(build)=arch/x86/vdso $@
204
205archclean:
206 $(Q)rm -rf $(objtree)/arch/i386
207 $(Q)rm -rf $(objtree)/arch/x86_64
208 $(Q)$(MAKE) $(clean)=$(boot)
209 $(Q)$(MAKE) $(clean)=arch/x86/tools
210
211define archhelp
212 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
213 echo ' install - Install kernel using'
214 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
215 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
216 echo ' install to $$(INSTALL_PATH) and run lilo'
217 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
218 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
219 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
220 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
221 echo ' bzdisk/fdimage*/isoimage also accept:'
222 echo ' FDARGS="..." arguments for the booted kernel'
223 echo ' FDINITRD=file initrd for the booted kernel'
224endef
1# SPDX-License-Identifier: GPL-2.0
2# Unified Makefile for i386 and x86_64
3
4# select defconfig based on actual architecture
5ifeq ($(ARCH),x86)
6 ifeq ($(shell uname -m),x86_64)
7 KBUILD_DEFCONFIG := x86_64_defconfig
8 else
9 KBUILD_DEFCONFIG := i386_defconfig
10 endif
11else
12 KBUILD_DEFCONFIG := $(ARCH)_defconfig
13endif
14
15# For gcc stack alignment is specified with -mpreferred-stack-boundary,
16# clang has the option -mstack-alignment for that purpose.
17ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
18 cc_stack_align4 := -mpreferred-stack-boundary=2
19 cc_stack_align8 := -mpreferred-stack-boundary=3
20else ifneq ($(call cc-option, -mstack-alignment=16),)
21 cc_stack_align4 := -mstack-alignment=4
22 cc_stack_align8 := -mstack-alignment=8
23endif
24
25# How to compile the 16-bit code. Note we always compile for -march=i386;
26# that way we can complain to the user if the CPU is insufficient.
27#
28# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
29# older versions of GCC, include an *assembly* header to make sure that
30# gcc doesn't play any games behind our back.
31CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
32M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
33
34REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \
35 -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
36 -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
37 -mno-mmx -mno-sse
38
39REALMODE_CFLAGS += -ffreestanding
40REALMODE_CFLAGS += -fno-stack-protector
41REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
42REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
43export REALMODE_CFLAGS
44
45# BITS is used as extension for files which are available in a 32 bit
46# and a 64 bit version to simplify shared Makefiles.
47# e.g.: obj-y += foo_$(BITS).o
48export BITS
49
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#
57KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
58KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
59
60ifeq ($(CONFIG_X86_32),y)
61 BITS := 32
62 UTS_MACHINE := i386
63 CHECKFLAGS += -D__i386__
64
65 biarch := $(call cc-option,-m32)
66 KBUILD_AFLAGS += $(biarch)
67 KBUILD_CFLAGS += $(biarch)
68
69 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
70
71 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
72 # with nonstandard options
73 KBUILD_CFLAGS += -fno-pic
74
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.
78 KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))
79
80 # CPU-specific tuning. Anything which can be shared with UML should go here.
81 include arch/x86/Makefile_32.cpu
82 KBUILD_CFLAGS += $(cflags-y)
83
84 # temporary until string.h is fixed
85 KBUILD_CFLAGS += -ffreestanding
86else
87 BITS := 64
88 UTS_MACHINE := x86_64
89 CHECKFLAGS += -D__x86_64__
90
91 biarch := -m64
92 KBUILD_AFLAGS += -m64
93 KBUILD_CFLAGS += -m64
94
95 # Align jump targets to 1 byte, not the default 16 bytes:
96 KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)
97
98 # Pack loops tightly as well:
99 KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)
100
101 # Don't autogenerate traditional x87 instructions
102 KBUILD_CFLAGS += $(call cc-option,-mno-80387)
103 KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
104
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.
112 KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8))
113
114 # Use -mskip-rax-setup if supported.
115 KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
116
117 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
118 cflags-$(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))
123 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
124 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
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
130endif
131
132ifdef CONFIG_X86_X32
133 x32_ld_ok := $(call try-run,\
134 /bin/echo -e '1: .quad 1b' | \
135 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
136 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
137 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
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
145endif
146export CONFIG_X86_X32_ABI
147
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#
153ifdef 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
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
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.)
165 endif
166
167 endif
168 endif
169endif
170
171ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
172 # This compiler flag is not supported by Clang:
173 KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
174endif
175
176# Workaround for a gcc prelease that unfortunately was shipped in a suse release
177KBUILD_CFLAGS += -Wno-sign-compare
178#
179KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
180
181# Avoid indirect branches in kernel to deal with Spectre
182ifdef CONFIG_RETPOLINE
183 KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
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
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
193endif
194
195KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
196
197ifdef CONFIG_X86_NEED_RELOCS
198LDFLAGS_vmlinux := --emit-relocs --discard-none
199else
200LDFLAGS_vmlinux :=
201endif
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#
208ifdef CONFIG_X86_64
209LDFLAGS_vmlinux += -z max-page-size=0x200000
210endif
211
212archscripts: scripts_basic
213 $(Q)$(MAKE) $(build)=arch/x86/tools relocs
214
215###
216# Syscall table generation
217
218archheaders:
219 $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
220
221###
222# Kernel objects
223
224head-y := arch/x86/kernel/head_$(BITS).o
225head-y += arch/x86/kernel/head$(BITS).o
226head-y += arch/x86/kernel/ebda.o
227head-y += arch/x86/kernel/platform-quirks.o
228
229libs-y += arch/x86/lib
230
231# See arch/x86/Kbuild for content of core part of the kernel
232core-y += arch/x86/
233
234# drivers-y are linked after core-y
235drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
236drivers-$(CONFIG_PCI) += arch/x86/pci/
237
238# must be linked after kernel
239drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
240
241# suspend and hibernation support
242drivers-$(CONFIG_PM) += arch/x86/power/
243
244drivers-$(CONFIG_FB) += arch/x86/video/
245
246####
247# boot loader support. Several targets are kept for legacy purposes
248
249boot := arch/x86/boot
250
251BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage
252
253PHONY += bzImage $(BOOT_TARGETS)
254
255# Default kernel to build
256all: bzImage
257
258# KBUILD_IMAGE specify target image being built
259KBUILD_IMAGE := $(boot)/bzImage
260
261bzImage: vmlinux
262ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
263 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
264endif
265 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
266 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
267 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
268
269$(BOOT_TARGETS): vmlinux
270 $(Q)$(MAKE) $(build)=$(boot) $@
271
272PHONY += install bzlilo
273install bzlilo:
274 $(Q)$(MAKE) $(build)=$(boot) $@
275
276PHONY += vdso_install
277vdso_install:
278 $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
279
280archprepare: checkbin
281checkbin:
282ifndef CONFIG_CC_HAS_ASM_GOTO
283 @echo Compiler lacks asm-goto support.
284 @exit 1
285endif
286ifdef CONFIG_RETPOLINE
287ifeq ($(RETPOLINE_CFLAGS),)
288 @echo "You are building kernel with non-retpoline compiler." >&2
289 @echo "Please update your compiler." >&2
290 @false
291endif
292endif
293
294archclean:
295 $(Q)rm -rf $(objtree)/arch/i386
296 $(Q)rm -rf $(objtree)/arch/x86_64
297 $(Q)$(MAKE) $(clean)=$(boot)
298 $(Q)$(MAKE) $(clean)=arch/x86/tools
299
300define archhelp
301 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
302 echo ' install - Install kernel using'
303 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
304 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
305 echo ' install to $$(INSTALL_PATH) and run lilo'
306 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
307 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
308 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
309 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
310 echo ' bzdisk/fdimage*/isoimage also accept:'
311 echo ' FDARGS="..." arguments for the booted kernel'
312 echo ' FDINITRD=file initrd for the booted kernel'
313endef