1 # Unified Makefile for i386 and x86_64
3 # select defconfig based on actual architecture
5 ifeq ($(shell uname
-m
),x86_64
)
6 KBUILD_DEFCONFIG
:= x86_64_defconfig
8 KBUILD_DEFCONFIG
:= i386_defconfig
11 KBUILD_DEFCONFIG
:= $(ARCH
)_defconfig
14 # How to compile the 16-bit code. Note we always compile for -march=i386;
15 # that way we can complain to the user if the CPU is insufficient.
17 # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
18 # older versions of GCC, include an *assembly* header to make sure that
19 # gcc doesn't play any games behind our back.
20 CODE16GCC_CFLAGS
:= -m32
-Wa
,$(srctree
)/arch
/x86
/boot
/code16gcc.h
21 M16_CFLAGS
:= $(call cc-option
, -m16
, $(CODE16GCC_CFLAGS
))
23 REALMODE_CFLAGS
:= $(M16_CFLAGS
) -g
-Os
-D__KERNEL__ \
24 -DDISABLE_BRANCH_PROFILING \
25 -Wall
-Wstrict-prototypes
-march
=i386
-mregparm
=3 \
26 -fno-strict-aliasing
-fomit-frame-pointer
-fno-pic \
28 $(call cc-option
, -ffreestanding
) \
29 $(call cc-option
, -fno-stack-protector
) \
30 $(call cc-option
, -mpreferred-stack-boundary
=2)
31 export REALMODE_CFLAGS
33 # BITS is used as extension for files which are available in a 32 bit
34 # and a 64 bit version to simplify shared Makefiles.
35 # e.g.: obj-y += foo_$(BITS).o
38 ifdef CONFIG_X86_NEED_RELOCS
39 LDFLAGS_vmlinux
:= --emit-relocs
43 # Prevent GCC from generating any FP code by mistake.
45 # This must happen before we try the -mpreferred-stack-boundary, see:
47 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
49 KBUILD_CFLAGS
+= -mno-sse
-mno-mmx
-mno-sse2
-mno-3dnow
50 KBUILD_CFLAGS
+= $(call cc-option
,-mno-avx
,)
52 ifeq ($(CONFIG_X86_32
),y
)
55 CHECKFLAGS
+= -D__i386__
57 biarch
:= $(call cc-option
,-m32
)
58 KBUILD_AFLAGS
+= $(biarch
)
59 KBUILD_CFLAGS
+= $(biarch
)
61 KBUILD_CFLAGS
+= -msoft-float
-mregparm
=3 -freg-struct-return
63 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
64 # with nonstandard options
65 KBUILD_CFLAGS
+= -fno-pic
67 # prevent gcc from keeping the stack 16 byte aligned
68 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=2)
70 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
71 # a lot more stack due to the lack of sharing of stacklots:
72 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0400, \
73 $(call cc-option
,-fno-unit-at-a-time
))
75 # CPU-specific tuning. Anything which can be shared with UML should go here.
76 include arch
/x86
/Makefile_32.cpu
77 KBUILD_CFLAGS
+= $(cflags-y
)
79 # temporary until string.h is fixed
80 KBUILD_CFLAGS
+= -ffreestanding
84 CHECKFLAGS
+= -D__x86_64__
-m64
90 # Align jump targets to 1 byte, not the default 16 bytes:
91 KBUILD_CFLAGS
+= -falign-jumps
=1
93 # Pack loops tightly as well:
94 KBUILD_CFLAGS
+= -falign-loops
=1
96 # Don't autogenerate traditional x87 instructions
97 KBUILD_CFLAGS
+= $(call cc-option
,-mno-80387
)
98 KBUILD_CFLAGS
+= $(call cc-option
,-mno-fp-ret-in-387
)
100 # Use -mpreferred-stack-boundary=3 if supported.
101 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=3)
103 # Use -mskip-rax-setup if supported.
104 KBUILD_CFLAGS
+= $(call cc-option
,-mskip-rax-setup
)
106 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
107 cflags-
$(CONFIG_MK8
) += $(call cc-option
,-march
=k8
)
108 cflags-
$(CONFIG_MPSC
) += $(call cc-option
,-march
=nocona
)
110 cflags-
$(CONFIG_MCORE2
) += \
111 $(call cc-option
,-march
=core2
,$(call cc-option
,-mtune
=generic
))
112 cflags-
$(CONFIG_MATOM
) += $(call cc-option
,-march
=atom
) \
113 $(call cc-option
,-mtune
=atom
,$(call cc-option
,-mtune
=generic
))
114 cflags-
$(CONFIG_GENERIC_CPU
) += $(call cc-option
,-mtune
=generic
)
115 KBUILD_CFLAGS
+= $(cflags-y
)
117 KBUILD_CFLAGS
+= -mno-red-zone
118 KBUILD_CFLAGS
+= -mcmodel
=kernel
120 # -funit-at-a-time shrinks the kernel .text considerably
121 # unfortunately it makes reading oopses harder.
122 KBUILD_CFLAGS
+= $(call cc-option
,-funit-at-a-time
)
124 # this works around some issues with generating unwind tables in older gccs
125 # newer gccs do it by default
126 KBUILD_CFLAGS
+= $(call cc-option
,-maccumulate-outgoing-args
)
129 # Make sure compiler does not have buggy stack-protector support.
130 ifdef CONFIG_CC_STACKPROTECTOR
131 cc_has_sp
:= $(srctree
)/scripts
/gcc-x86_
$(BITS
)-has-stack-protector.sh
132 ifneq ($(shell $(CONFIG_SHELL
) $(cc_has_sp
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
133 $(warning stack-protector enabled but compiler support broken
)
138 x32_ld_ok
:= $(call try-run
,\
139 /bin
/echo
-e
'1: .quad 1b' | \
140 $(CC
) $(KBUILD_AFLAGS
) -c
-x assembler
-o
"$$TMP" - && \
141 $(OBJCOPY
) -O elf32-x86-64
"$$TMP" "$$TMPO" && \
142 $(LD
) -m elf32_x86_64
"$$TMPO" -o
"$$TMP",y
,n
)
143 ifeq ($(x32_ld_ok
),y
)
144 CONFIG_X86_X32_ABI
:= y
145 KBUILD_AFLAGS
+= -DCONFIG_X86_X32_ABI
146 KBUILD_CFLAGS
+= -DCONFIG_X86_X32_ABI
148 $(warning CONFIG_X86_X32 enabled but no binutils support
)
151 export CONFIG_X86_X32_ABI
153 # Don't unroll struct assignments with kmemcheck enabled
154 ifeq ($(CONFIG_KMEMCHECK
),y
)
155 KBUILD_CFLAGS
+= $(call cc-option
,-fno-builtin-memcpy
)
158 # Stackpointer is addressed different for 32 bit and 64 bit x86
159 sp-
$(CONFIG_X86_32
) := esp
160 sp-
$(CONFIG_X86_64
) := rsp
162 # does binutils support specific instructions?
163 asinstr
:= $(call as-instr
,fxsaveq
(%rax
),-DCONFIG_AS_FXSAVEQ
=1)
164 asinstr
+= $(call as-instr
,pshufb
%xmm0
$(comma
)%xmm0
,-DCONFIG_AS_SSSE3
=1)
165 asinstr
+= $(call as-instr
,crc32l
%eax
$(comma
)%eax
,-DCONFIG_AS_CRC32
=1)
166 avx_instr
:= $(call as-instr
,vxorps
%ymm0
$(comma
)%ymm1
$(comma
)%ymm2
,-DCONFIG_AS_AVX
=1)
167 avx2_instr
:=$(call as-instr
,vpbroadcastb
%xmm0
$(comma
)%ymm1
,-DCONFIG_AS_AVX2
=1)
169 KBUILD_AFLAGS
+= $(asinstr
) $(avx_instr
) $(avx2_instr
)
170 KBUILD_CFLAGS
+= $(asinstr
) $(avx_instr
) $(avx2_instr
)
172 LDFLAGS
:= -m elf_
$(UTS_MACHINE
)
175 KBUILD_CFLAGS
+= -pipe
176 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
177 KBUILD_CFLAGS
+= -Wno-sign-compare
179 KBUILD_CFLAGS
+= -fno-asynchronous-unwind-tables
181 KBUILD_CFLAGS
+= $(mflags-y
)
182 KBUILD_AFLAGS
+= $(mflags-y
)
184 archscripts
: scripts_basic
185 $(Q
)$(MAKE
) $(build
)=arch
/x86
/tools relocs
188 # Syscall table generation
191 $(Q
)$(MAKE
) $(build
)=arch
/x86
/entry
/syscalls
all
194 ifeq ($(CONFIG_KEXEC_FILE
),y
)
195 $(Q
)$(MAKE
) $(build
)=arch
/x86
/purgatory arch
/x86
/purgatory
/kexec-purgatory.c
201 head-y
:= arch
/x86
/kernel
/head_
$(BITS
).o
202 head-y
+= arch
/x86
/kernel
/head
$(BITS
).o
203 head-y
+= arch
/x86
/kernel
/head.o
205 libs-y
+= arch
/x86
/lib
/
207 # See arch/x86/Kbuild for content of core part of the kernel
210 # drivers-y are linked after core-y
211 drivers-
$(CONFIG_MATH_EMULATION
) += arch
/x86
/math-emu
/
212 drivers-
$(CONFIG_PCI
) += arch
/x86
/pci
/
214 # must be linked after kernel/
215 drivers-
$(CONFIG_OPROFILE
) += arch
/x86
/oprofile
/
217 # suspend and hibernation support
218 drivers-
$(CONFIG_PM
) += arch
/x86
/power
/
220 drivers-
$(CONFIG_FB
) += arch
/x86
/video
/
222 drivers-
$(CONFIG_RAS
) += arch
/x86
/ras
/
225 # boot loader support. Several targets are kept for legacy purposes
227 boot
:= arch
/x86
/boot
229 BOOT_TARGETS
= bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
231 PHONY
+= bzImage
$(BOOT_TARGETS
)
233 # Default kernel to build
236 # KBUILD_IMAGE specify target image being built
237 KBUILD_IMAGE
:= $(boot
)/bzImage
240 ifeq ($(CONFIG_X86_DECODER_SELFTEST
),y
)
241 $(Q
)$(MAKE
) $(build
)=arch
/x86
/tools posttest
243 $(Q
)$(MAKE
) $(build
)=$(boot
) $(KBUILD_IMAGE
)
244 $(Q
)mkdir
-p
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
245 $(Q
)ln
-fsn ..
/..
/x86
/boot
/bzImage
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
/$@
247 $(BOOT_TARGETS
): vmlinux
248 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
252 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
254 PHONY
+= vdso_install
256 $(Q
)$(MAKE
) $(build
)=arch
/x86
/entry
/vdso
$@
259 $(Q
)rm -rf
$(objtree
)/arch
/i386
260 $(Q
)rm -rf
$(objtree
)/arch
/x86_64
261 $(Q
)$(MAKE
) $(clean)=$(boot
)
262 $(Q
)$(MAKE
) $(clean)=arch
/x86
/tools
263 $(Q
)$(MAKE
) $(clean)=arch
/x86
/purgatory
266 echo
'* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
267 echo
' install - Install kernel using'
268 echo
' (your) ~/bin/$(INSTALLKERNEL) or'
269 echo
' (distribution) /sbin/$(INSTALLKERNEL) or'
270 echo
' install to $$(INSTALL_PATH) and run lilo'
271 echo
' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
272 echo
' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
273 echo
' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
274 echo
' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
275 echo
' bzdisk/fdimage*/isoimage also accept:'
276 echo
' FDARGS="..." arguments for the booted kernel'
277 echo
' FDINITRD=file initrd for the booted kernel'