1 # Unified Makefile for i386 and x86_64
3 # select defconfig based on actual architecture
5 KBUILD_DEFCONFIG
:= i386_defconfig
7 KBUILD_DEFCONFIG
:= $(ARCH
)_defconfig
10 # BITS is used as extension for files which are available in a 32 bit
11 # and a 64 bit version to simplify shared Makefiles.
12 # e.g.: obj-y += foo_$(BITS).o
15 ifeq ($(CONFIG_X86_32
),y
)
18 CHECKFLAGS
+= -D__i386__
20 biarch
:= $(call cc-option
,-m32
)
21 KBUILD_AFLAGS
+= $(biarch
)
22 KBUILD_CFLAGS
+= $(biarch
)
24 ifdef CONFIG_RELOCATABLE
25 LDFLAGS_vmlinux
:= --emit-relocs
28 KBUILD_CFLAGS
+= -msoft-float
-mregparm
=3 -freg-struct-return
30 # prevent gcc from keeping the stack 16 byte aligned
31 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=2)
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
+= $(shell if
[ $(call cc-version
) -lt
0400 ] ; then \
36 echo
$(call cc-option
,-fno-unit-at-a-time
); fi
;)
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
)
42 # temporary until string.h is fixed
43 KBUILD_CFLAGS
+= -ffreestanding
47 CHECKFLAGS
+= -D__x86_64__
-m64
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
)
56 cflags-
$(CONFIG_MCORE2
) += \
57 $(call cc-option
,-march
=core2
,$(call cc-option
,-mtune
=generic
))
58 cflags-
$(CONFIG_GENERIC_CPU
) += $(call cc-option
,-mtune
=generic
)
59 KBUILD_CFLAGS
+= $(cflags-y
)
61 KBUILD_CFLAGS
+= -mno-red-zone
62 KBUILD_CFLAGS
+= -mcmodel
=kernel
64 # -funit-at-a-time shrinks the kernel .text considerably
65 # unfortunately it makes reading oopses harder.
66 KBUILD_CFLAGS
+= $(call cc-option
,-funit-at-a-time
)
68 # this works around some issues with generating unwind tables in older gccs
69 # newer gccs do it by default
70 KBUILD_CFLAGS
+= -maccumulate-outgoing-args
73 ifdef CONFIG_CC_STACKPROTECTOR
74 cc_has_sp
:= $(srctree
)/scripts
/gcc-x86_
$(BITS
)-has-stack-protector.sh
75 ifeq ($(shell $(CONFIG_SHELL
) $(cc_has_sp
) $(CC
)),y
)
76 stackp-y
:= -fstack-protector
77 stackp-
$(CONFIG_CC_STACKPROTECTOR_ALL
) += -fstack-protector-all
78 KBUILD_CFLAGS
+= $(stackp-y
)
80 $(warning stack protector enabled but no compiler support
)
84 # Stackpointer is addressed different for 32 bit and 64 bit x86
85 sp-
$(CONFIG_X86_32
) := esp
86 sp-
$(CONFIG_X86_64
) := rsp
88 # do binutils support CFI?
89 cfi
:= $(call as-instr
,.cfi_startproc
\n.cfi_rel_offset
$(sp-y
)$(comma
)0\n.cfi_endproc
,-DCONFIG_AS_CFI
=1)
90 # is .cfi_signal_frame supported too?
91 cfi-sigframe
:= $(call as-instr
,.cfi_startproc
\n.cfi_signal_frame
\n.cfi_endproc
,-DCONFIG_AS_CFI_SIGNAL_FRAME
=1)
92 KBUILD_AFLAGS
+= $(cfi
) $(cfi-sigframe
)
93 KBUILD_CFLAGS
+= $(cfi
) $(cfi-sigframe
)
95 LDFLAGS
:= -m elf_
$(UTS_MACHINE
)
98 KBUILD_CFLAGS
+= -pipe
99 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
100 KBUILD_CFLAGS
+= -Wno-sign-compare
102 KBUILD_CFLAGS
+= -fno-asynchronous-unwind-tables
103 # prevent gcc from generating any FP code by mistake
104 KBUILD_CFLAGS
+= $(call cc-option
,-mno-sse
-mno-mmx
-mno-sse2
-mno-3dnow
,)
106 KBUILD_CFLAGS
+= $(mflags-y
)
107 KBUILD_AFLAGS
+= $(mflags-y
)
112 head-y
:= arch
/x86
/kernel
/head_
$(BITS
).o
113 head-y
+= arch
/x86
/kernel
/head
$(BITS
).o
114 head-y
+= arch
/x86
/kernel
/head.o
115 head-y
+= arch
/x86
/kernel
/init_task.o
117 libs-y
+= arch
/x86
/lib
/
119 # See arch/x86/Kbuild for content of core part of the kernel
122 # drivers-y are linked after core-y
123 drivers-
$(CONFIG_MATH_EMULATION
) += arch
/x86
/math-emu
/
124 drivers-
$(CONFIG_PCI
) += arch
/x86
/pci
/
126 # must be linked after kernel/
127 drivers-
$(CONFIG_OPROFILE
) += arch
/x86
/oprofile
/
129 # suspend and hibernation support
130 drivers-
$(CONFIG_PM
) += arch
/x86
/power
/
132 ifeq ($(CONFIG_X86_32
),y
)
133 drivers-
$(CONFIG_FB
) += arch
/x86
/video
/
137 # boot loader support. Several targets are kept for legacy purposes
139 boot
:= arch
/x86
/boot
141 BOOT_TARGETS
= bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
143 PHONY
+= bzImage
$(BOOT_TARGETS
)
145 # Default kernel to build
148 # KBUILD_IMAGE specify target image being built
149 KBUILD_IMAGE
:= $(boot
)/bzImage
152 $(Q
)$(MAKE
) $(build
)=$(boot
) $(KBUILD_IMAGE
)
153 $(Q
)mkdir
-p
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
154 $(Q
)ln
-fsn ..
/..
/x86
/boot
/bzImage
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
/$@
156 $(BOOT_TARGETS
): vmlinux
157 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
161 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
163 PHONY
+= vdso_install
165 $(Q
)$(MAKE
) $(build
)=arch
/x86
/vdso
$@
168 $(Q
)rm -rf
$(objtree
)/arch
/i386
169 $(Q
)rm -rf
$(objtree
)/arch
/x86_64
170 $(Q
)$(MAKE
) $(clean)=$(boot
)
173 echo
'* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
174 echo
' install - Install kernel using'
175 echo
' (your) ~/bin/installkernel or'
176 echo
' (distribution) /sbin/installkernel or'
177 echo
' install to $$(INSTALL_PATH) and run lilo'
178 echo
' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
179 echo
' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
180 echo
' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
181 echo
' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
182 echo
' bzdisk/fdimage*/isoimage also accept:'
183 echo
' FDARGS="..." arguments for the booted kernel'
184 echo
' FDINITRD=file initrd for the booted kernel'