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
:= $(ARCH
)_defconfig
14 # BITS is used as extension for files which are available in a 32 bit
15 # and a 64 bit version to simplify shared Makefiles.
16 # e.g.: obj-y += foo_$(BITS).o
19 ifdef CONFIG_X86_NEED_RELOCS
20 LDFLAGS_vmlinux
:= --emit-relocs
23 ifeq ($(CONFIG_X86_32
),y
)
26 CHECKFLAGS
+= -D__i386__
28 biarch
:= $(call cc-option
,-m32
)
29 KBUILD_AFLAGS
+= $(biarch
)
30 KBUILD_CFLAGS
+= $(biarch
)
32 KBUILD_CFLAGS
+= -msoft-float
-mregparm
=3 -freg-struct-return
34 # Don't autogenerate MMX or SSE instructions
35 KBUILD_CFLAGS
+= -mno-mmx
-mno-sse
37 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
38 # with nonstandard options
39 KBUILD_CFLAGS
+= -fno-pic
41 # prevent gcc from keeping the stack 16 byte aligned
42 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=2)
44 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
45 # a lot more stack due to the lack of sharing of stacklots:
46 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0400, \
47 $(call cc-option
,-fno-unit-at-a-time
))
49 # CPU-specific tuning. Anything which can be shared with UML should go here.
50 include $(srctree
)/arch
/x86
/Makefile_32.cpu
51 KBUILD_CFLAGS
+= $(cflags-y
)
53 # temporary until string.h is fixed
54 KBUILD_CFLAGS
+= -ffreestanding
58 CHECKFLAGS
+= -D__x86_64__
-m64
63 # Don't autogenerate MMX or SSE instructions
64 KBUILD_CFLAGS
+= -mno-mmx
-mno-sse
66 # Use -mpreferred-stack-boundary=3 if supported.
67 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=3)
69 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
70 cflags-
$(CONFIG_MK8
) += $(call cc-option
,-march
=k8
)
71 cflags-
$(CONFIG_MPSC
) += $(call cc-option
,-march
=nocona
)
73 cflags-
$(CONFIG_MCORE2
) += \
74 $(call cc-option
,-march
=core2
,$(call cc-option
,-mtune
=generic
))
75 cflags-
$(CONFIG_MATOM
) += $(call cc-option
,-march
=atom
) \
76 $(call cc-option
,-mtune
=atom
,$(call cc-option
,-mtune
=generic
))
77 cflags-
$(CONFIG_GENERIC_CPU
) += $(call cc-option
,-mtune
=generic
)
78 KBUILD_CFLAGS
+= $(cflags-y
)
80 KBUILD_CFLAGS
+= -mno-red-zone
81 KBUILD_CFLAGS
+= -mcmodel
=kernel
83 # -funit-at-a-time shrinks the kernel .text considerably
84 # unfortunately it makes reading oopses harder.
85 KBUILD_CFLAGS
+= $(call cc-option
,-funit-at-a-time
)
87 # this works around some issues with generating unwind tables in older gccs
88 # newer gccs do it by default
89 KBUILD_CFLAGS
+= -maccumulate-outgoing-args
92 ifdef CONFIG_CC_STACKPROTECTOR
93 cc_has_sp
:= $(srctree
)/scripts
/gcc-x86_
$(BITS
)-has-stack-protector.sh
94 ifeq ($(shell $(CONFIG_SHELL
) $(cc_has_sp
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
95 stackp-y
:= -fstack-protector
96 KBUILD_CFLAGS
+= $(stackp-y
)
98 $(warning stack protector enabled but no compiler support
)
103 x32_ld_ok
:= $(call try-run
,\
104 /bin
/echo
-e
'1: .quad 1b' | \
105 $(CC
) $(KBUILD_AFLAGS
) -c
-x assembler
-o
"$$TMP" - && \
106 $(OBJCOPY
) -O elf32-x86-64
"$$TMP" "$$TMPO" && \
107 $(LD
) -m elf32_x86_64
"$$TMPO" -o
"$$TMP",y
,n
)
108 ifeq ($(x32_ld_ok
),y
)
109 CONFIG_X86_X32_ABI
:= y
110 KBUILD_AFLAGS
+= -DCONFIG_X86_X32_ABI
111 KBUILD_CFLAGS
+= -DCONFIG_X86_X32_ABI
113 $(warning CONFIG_X86_X32 enabled but no binutils support
)
116 export CONFIG_X86_X32_ABI
118 # Don't unroll struct assignments with kmemcheck enabled
119 ifeq ($(CONFIG_KMEMCHECK
),y
)
120 KBUILD_CFLAGS
+= $(call cc-option
,-fno-builtin-memcpy
)
123 # Stackpointer is addressed different for 32 bit and 64 bit x86
124 sp-
$(CONFIG_X86_32
) := esp
125 sp-
$(CONFIG_X86_64
) := rsp
127 # do binutils support CFI?
128 cfi
:= $(call as-instr
,.cfi_startproc
\n.cfi_rel_offset
$(sp-y
)$(comma
)0\n.cfi_endproc
,-DCONFIG_AS_CFI
=1)
129 # is .cfi_signal_frame supported too?
130 cfi-sigframe
:= $(call as-instr
,.cfi_startproc
\n.cfi_signal_frame
\n.cfi_endproc
,-DCONFIG_AS_CFI_SIGNAL_FRAME
=1)
131 cfi-sections
:= $(call as-instr
,.cfi_sections .debug_frame
,-DCONFIG_AS_CFI_SECTIONS
=1)
133 # does binutils support specific instructions?
134 asinstr
:= $(call as-instr
,fxsaveq
(%rax
),-DCONFIG_AS_FXSAVEQ
=1)
135 avx_instr
:= $(call as-instr
,vxorps
%ymm0
$(comma
)%ymm1
$(comma
)%ymm2
,-DCONFIG_AS_AVX
=1)
136 avx2_instr
:=$(call as-instr
,vpbroadcastb
%xmm0
$(comma
)%ymm1
,-DCONFIG_AS_AVX2
=1)
138 KBUILD_AFLAGS
+= $(cfi
) $(cfi-sigframe
) $(cfi-sections
) $(asinstr
) $(avx_instr
) $(avx2_instr
)
139 KBUILD_CFLAGS
+= $(cfi
) $(cfi-sigframe
) $(cfi-sections
) $(asinstr
) $(avx_instr
) $(avx2_instr
)
141 LDFLAGS
:= -m elf_
$(UTS_MACHINE
)
144 KBUILD_CFLAGS
+= -pipe
145 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
146 KBUILD_CFLAGS
+= -Wno-sign-compare
148 KBUILD_CFLAGS
+= -fno-asynchronous-unwind-tables
149 # prevent gcc from generating any FP code by mistake
150 KBUILD_CFLAGS
+= $(call cc-option
,-mno-sse
-mno-mmx
-mno-sse2
-mno-3dnow
,)
151 KBUILD_CFLAGS
+= $(call cc-option
,-mno-avx
,)
153 KBUILD_CFLAGS
+= $(mflags-y
)
154 KBUILD_AFLAGS
+= $(mflags-y
)
156 archscripts
: scripts_basic
157 $(Q
)$(MAKE
) $(build
)=arch
/x86
/tools relocs
160 # Syscall table generation
163 $(Q
)$(MAKE
) $(build
)=arch
/x86
/syscalls
all
168 head-y
:= arch
/x86
/kernel
/head_
$(BITS
).o
169 head-y
+= arch
/x86
/kernel
/head
$(BITS
).o
170 head-y
+= arch
/x86
/kernel
/head.o
172 libs-y
+= arch
/x86
/lib
/
174 # See arch/x86/Kbuild for content of core part of the kernel
177 # drivers-y are linked after core-y
178 drivers-
$(CONFIG_MATH_EMULATION
) += arch
/x86
/math-emu
/
179 drivers-
$(CONFIG_PCI
) += arch
/x86
/pci
/
181 # must be linked after kernel/
182 drivers-
$(CONFIG_OPROFILE
) += arch
/x86
/oprofile
/
184 # suspend and hibernation support
185 drivers-
$(CONFIG_PM
) += arch
/x86
/power
/
187 drivers-
$(CONFIG_FB
) += arch
/x86
/video
/
190 # boot loader support. Several targets are kept for legacy purposes
192 boot
:= arch
/x86
/boot
194 BOOT_TARGETS
= bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
196 PHONY
+= bzImage
$(BOOT_TARGETS
)
198 # Default kernel to build
201 # KBUILD_IMAGE specify target image being built
202 KBUILD_IMAGE
:= $(boot
)/bzImage
205 ifeq ($(CONFIG_X86_DECODER_SELFTEST
),y
)
206 $(Q
)$(MAKE
) $(build
)=arch
/x86
/tools posttest
208 $(Q
)$(MAKE
) $(build
)=$(boot
) $(KBUILD_IMAGE
)
209 $(Q
)mkdir
-p
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
210 $(Q
)ln
-fsn ..
/..
/x86
/boot
/bzImage
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
/$@
212 $(BOOT_TARGETS
): vmlinux
213 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
217 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
219 PHONY
+= vdso_install
221 $(Q
)$(MAKE
) $(build
)=arch
/x86
/vdso
$@
224 $(Q
)rm -rf
$(objtree
)/arch
/i386
225 $(Q
)rm -rf
$(objtree
)/arch
/x86_64
226 $(Q
)$(MAKE
) $(clean)=$(boot
)
227 $(Q
)$(MAKE
) $(clean)=arch
/x86
/tools
231 $(if
$(wildcard $(objtree
)/.config
),, $(error You need an existing .config for this target
))
232 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/kconfig
/merge_config.sh
-m
-O
$(objtree
) $(objtree
)/.config arch
/x86
/configs
/kvm_guest.config
233 $(Q
)yes
"" |
$(MAKE
) oldconfig
236 echo
'* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
237 echo
' install - Install kernel using'
238 echo
' (your) ~/bin/$(INSTALLKERNEL) or'
239 echo
' (distribution) /sbin/$(INSTALLKERNEL) or'
240 echo
' install to $$(INSTALL_PATH) and run lilo'
241 echo
' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
242 echo
' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
243 echo
' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
244 echo
' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
245 echo
' bzdisk/fdimage*/isoimage also accept:'
246 echo
' FDARGS="..." arguments for the booted kernel'
247 echo
' FDINITRD=file initrd for the booted kernel'
248 echo
' kvmconfig - Enable additional options for guest kernel support'