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
42 ifeq ($(CONFIG_X86_32
),y
)
45 CHECKFLAGS
+= -D__i386__
47 biarch
:= $(call cc-option
,-m32
)
48 KBUILD_AFLAGS
+= $(biarch
)
49 KBUILD_CFLAGS
+= $(biarch
)
51 KBUILD_CFLAGS
+= -msoft-float
-mregparm
=3 -freg-struct-return
53 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
54 # with nonstandard options
55 KBUILD_CFLAGS
+= -fno-pic
57 # prevent gcc from keeping the stack 16 byte aligned
58 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=2)
60 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
61 # a lot more stack due to the lack of sharing of stacklots:
62 KBUILD_CFLAGS
+= $(call cc-ifversion
, -lt
, 0400, \
63 $(call cc-option
,-fno-unit-at-a-time
))
65 # CPU-specific tuning. Anything which can be shared with UML should go here.
66 include arch
/x86
/Makefile_32.cpu
67 KBUILD_CFLAGS
+= $(cflags-y
)
69 # temporary until string.h is fixed
70 KBUILD_CFLAGS
+= -ffreestanding
74 CHECKFLAGS
+= -D__x86_64__
-m64
80 # Don't autogenerate traditional x87 instructions
81 KBUILD_CFLAGS
+= $(call cc-option
,-mno-80387
)
82 KBUILD_CFLAGS
+= $(call cc-option
,-mno-fp-ret-in-387
)
84 # Use -mpreferred-stack-boundary=3 if supported.
85 KBUILD_CFLAGS
+= $(call cc-option
,-mpreferred-stack-boundary
=3)
87 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
88 cflags-
$(CONFIG_MK8
) += $(call cc-option
,-march
=k8
)
89 cflags-
$(CONFIG_MPSC
) += $(call cc-option
,-march
=nocona
)
91 cflags-
$(CONFIG_MCORE2
) += \
92 $(call cc-option
,-march
=core2
,$(call cc-option
,-mtune
=generic
))
93 cflags-
$(CONFIG_MATOM
) += $(call cc-option
,-march
=atom
) \
94 $(call cc-option
,-mtune
=atom
,$(call cc-option
,-mtune
=generic
))
95 cflags-
$(CONFIG_GENERIC_CPU
) += $(call cc-option
,-mtune
=generic
)
96 KBUILD_CFLAGS
+= $(cflags-y
)
98 KBUILD_CFLAGS
+= -mno-red-zone
99 KBUILD_CFLAGS
+= -mcmodel
=kernel
101 # -funit-at-a-time shrinks the kernel .text considerably
102 # unfortunately it makes reading oopses harder.
103 KBUILD_CFLAGS
+= $(call cc-option
,-funit-at-a-time
)
105 # this works around some issues with generating unwind tables in older gccs
106 # newer gccs do it by default
107 KBUILD_CFLAGS
+= $(call cc-option
,-maccumulate-outgoing-args
)
110 # Make sure compiler does not have buggy stack-protector support.
111 ifdef CONFIG_CC_STACKPROTECTOR
112 cc_has_sp
:= $(srctree
)/scripts
/gcc-x86_
$(BITS
)-has-stack-protector.sh
113 ifneq ($(shell $(CONFIG_SHELL
) $(cc_has_sp
) $(CC
) $(KBUILD_CPPFLAGS
) $(biarch
)),y
)
114 $(warning stack-protector enabled but compiler support broken
)
119 x32_ld_ok
:= $(call try-run
,\
120 /bin
/echo
-e
'1: .quad 1b' | \
121 $(CC
) $(KBUILD_AFLAGS
) -c
-x assembler
-o
"$$TMP" - && \
122 $(OBJCOPY
) -O elf32-x86-64
"$$TMP" "$$TMPO" && \
123 $(LD
) -m elf32_x86_64
"$$TMPO" -o
"$$TMP",y
,n
)
124 ifeq ($(x32_ld_ok
),y
)
125 CONFIG_X86_X32_ABI
:= y
126 KBUILD_AFLAGS
+= -DCONFIG_X86_X32_ABI
127 KBUILD_CFLAGS
+= -DCONFIG_X86_X32_ABI
129 $(warning CONFIG_X86_X32 enabled but no binutils support
)
132 export CONFIG_X86_X32_ABI
134 # Don't unroll struct assignments with kmemcheck enabled
135 ifeq ($(CONFIG_KMEMCHECK
),y
)
136 KBUILD_CFLAGS
+= $(call cc-option
,-fno-builtin-memcpy
)
139 # Stackpointer is addressed different for 32 bit and 64 bit x86
140 sp-
$(CONFIG_X86_32
) := esp
141 sp-
$(CONFIG_X86_64
) := rsp
143 # do binutils support CFI?
144 cfi
:= $(call as-instr
,.cfi_startproc
\n.cfi_rel_offset
$(sp-y
)$(comma
)0\n.cfi_endproc
,-DCONFIG_AS_CFI
=1)
145 # is .cfi_signal_frame supported too?
146 cfi-sigframe
:= $(call as-instr
,.cfi_startproc
\n.cfi_signal_frame
\n.cfi_endproc
,-DCONFIG_AS_CFI_SIGNAL_FRAME
=1)
147 cfi-sections
:= $(call as-instr
,.cfi_sections .debug_frame
,-DCONFIG_AS_CFI_SECTIONS
=1)
149 # does binutils support specific instructions?
150 asinstr
:= $(call as-instr
,fxsaveq
(%rax
),-DCONFIG_AS_FXSAVEQ
=1)
151 asinstr
+= $(call as-instr
,pshufb
%xmm0
$(comma
)%xmm0
,-DCONFIG_AS_SSSE3
=1)
152 asinstr
+= $(call as-instr
,crc32l
%eax
$(comma
)%eax
,-DCONFIG_AS_CRC32
=1)
153 avx_instr
:= $(call as-instr
,vxorps
%ymm0
$(comma
)%ymm1
$(comma
)%ymm2
,-DCONFIG_AS_AVX
=1)
154 avx2_instr
:=$(call as-instr
,vpbroadcastb
%xmm0
$(comma
)%ymm1
,-DCONFIG_AS_AVX2
=1)
156 KBUILD_AFLAGS
+= $(cfi
) $(cfi-sigframe
) $(cfi-sections
) $(asinstr
) $(avx_instr
) $(avx2_instr
)
157 KBUILD_CFLAGS
+= $(cfi
) $(cfi-sigframe
) $(cfi-sections
) $(asinstr
) $(avx_instr
) $(avx2_instr
)
159 LDFLAGS
:= -m elf_
$(UTS_MACHINE
)
162 KBUILD_CFLAGS
+= -pipe
163 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
164 KBUILD_CFLAGS
+= -Wno-sign-compare
166 KBUILD_CFLAGS
+= -fno-asynchronous-unwind-tables
167 # prevent gcc from generating any FP code by mistake
168 KBUILD_CFLAGS
+= -mno-sse
-mno-mmx
-mno-sse2
-mno-3dnow
169 KBUILD_CFLAGS
+= $(call cc-option
,-mno-avx
,)
171 KBUILD_CFLAGS
+= $(mflags-y
)
172 KBUILD_AFLAGS
+= $(mflags-y
)
174 archscripts
: scripts_basic
175 $(Q
)$(MAKE
) $(build
)=arch
/x86
/tools relocs
178 # Syscall table generation
181 $(Q
)$(MAKE
) $(build
)=arch
/x86
/syscalls
all
184 ifeq ($(CONFIG_KEXEC_FILE
),y
)
185 $(Q
)$(MAKE
) $(build
)=arch
/x86
/purgatory arch
/x86
/purgatory
/kexec-purgatory.c
191 head-y
:= arch
/x86
/kernel
/head_
$(BITS
).o
192 head-y
+= arch
/x86
/kernel
/head
$(BITS
).o
193 head-y
+= arch
/x86
/kernel
/head.o
195 libs-y
+= arch
/x86
/lib
/
197 # See arch/x86/Kbuild for content of core part of the kernel
200 # drivers-y are linked after core-y
201 drivers-
$(CONFIG_MATH_EMULATION
) += arch
/x86
/math-emu
/
202 drivers-
$(CONFIG_PCI
) += arch
/x86
/pci
/
204 # must be linked after kernel/
205 drivers-
$(CONFIG_OPROFILE
) += arch
/x86
/oprofile
/
207 # suspend and hibernation support
208 drivers-
$(CONFIG_PM
) += arch
/x86
/power
/
210 drivers-
$(CONFIG_FB
) += arch
/x86
/video
/
213 # boot loader support. Several targets are kept for legacy purposes
215 boot
:= arch
/x86
/boot
217 BOOT_TARGETS
= bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
219 PHONY
+= bzImage
$(BOOT_TARGETS
)
221 # Default kernel to build
224 # KBUILD_IMAGE specify target image being built
225 KBUILD_IMAGE
:= $(boot
)/bzImage
228 ifeq ($(CONFIG_X86_DECODER_SELFTEST
),y
)
229 $(Q
)$(MAKE
) $(build
)=arch
/x86
/tools posttest
231 $(Q
)$(MAKE
) $(build
)=$(boot
) $(KBUILD_IMAGE
)
232 $(Q
)mkdir
-p
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
233 $(Q
)ln
-fsn ..
/..
/x86
/boot
/bzImage
$(objtree
)/arch
/$(UTS_MACHINE
)/boot
/$@
235 $(BOOT_TARGETS
): vmlinux
236 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
240 $(Q
)$(MAKE
) $(build
)=$(boot
) $@
242 PHONY
+= vdso_install
244 $(Q
)$(MAKE
) $(build
)=arch
/x86
/vdso
$@
247 $(Q
)rm -rf
$(objtree
)/arch
/i386
248 $(Q
)rm -rf
$(objtree
)/arch
/x86_64
249 $(Q
)$(MAKE
) $(clean)=$(boot
)
250 $(Q
)$(MAKE
) $(clean)=arch
/x86
/tools
251 $(Q
)$(MAKE
) $(clean)=arch
/x86
/purgatory
254 echo
'* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
255 echo
' install - Install kernel using'
256 echo
' (your) ~/bin/$(INSTALLKERNEL) or'
257 echo
' (distribution) /sbin/$(INSTALLKERNEL) or'
258 echo
' install to $$(INSTALL_PATH) and run lilo'
259 echo
' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
260 echo
' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
261 echo
' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
262 echo
' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
263 echo
' bzdisk/fdimage*/isoimage also accept:'
264 echo
' FDARGS="..." arguments for the booted kernel'
265 echo
' FDINITRD=file initrd for the booted kernel'