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 SSE instructions
35 KBUILD_CFLAGS += -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 SSE instructions
64 KBUILD_CFLAGS += -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'