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 ifeq ($(CONFIG_X86_32),y)
22 CHECKFLAGS += -D__i386__
24 biarch := $(call cc-option,-m32)
25 KBUILD_AFLAGS += $(biarch)
26 KBUILD_CFLAGS += $(biarch)
28 ifdef CONFIG_RELOCATABLE
29 LDFLAGS_vmlinux := --emit-relocs
32 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
34 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
35 # with nonstandard options
36 KBUILD_CFLAGS += -fno-pic
38 # prevent gcc from keeping the stack 16 byte aligned
39 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
41 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
42 # a lot more stack due to the lack of sharing of stacklots:
43 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
44 $(call cc-option,-fno-unit-at-a-time))
46 # CPU-specific tuning. Anything which can be shared with UML should go here.
47 include $(srctree)/arch/x86/Makefile_32.cpu
48 KBUILD_CFLAGS += $(cflags-y)
50 # temporary until string.h is fixed
51 KBUILD_CFLAGS += -ffreestanding
55 CHECKFLAGS += -D__x86_64__ -m64
60 # Use -mpreferred-stack-boundary=3 if supported.
61 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)
63 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
64 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
65 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
67 cflags-$(CONFIG_MCORE2) += \
68 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
69 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
70 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
71 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
72 KBUILD_CFLAGS += $(cflags-y)
74 KBUILD_CFLAGS += -mno-red-zone
75 KBUILD_CFLAGS += -mcmodel=kernel
77 # -funit-at-a-time shrinks the kernel .text considerably
78 # unfortunately it makes reading oopses harder.
79 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
81 # this works around some issues with generating unwind tables in older gccs
82 # newer gccs do it by default
83 KBUILD_CFLAGS += -maccumulate-outgoing-args
86 ifdef CONFIG_CC_STACKPROTECTOR
87 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
88 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
89 stackp-y := -fstack-protector
90 KBUILD_CFLAGS += $(stackp-y)
92 $(warning stack protector enabled but no compiler support)
97 x32_ld_ok := $(call try-run,\
98 /bin/echo -e '1: .quad 1b' | \
99 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
100 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
101 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
102 ifeq ($(x32_ld_ok),y)
103 CONFIG_X86_X32_ABI := y
104 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
105 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
107 $(warning CONFIG_X86_X32 enabled but no binutils support)
110 export CONFIG_X86_X32_ABI
112 # Don't unroll struct assignments with kmemcheck enabled
113 ifeq ($(CONFIG_KMEMCHECK),y)
114 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
117 # Stackpointer is addressed different for 32 bit and 64 bit x86
118 sp-$(CONFIG_X86_32) := esp
119 sp-$(CONFIG_X86_64) := rsp
121 # do binutils support CFI?
122 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
123 # is .cfi_signal_frame supported too?
124 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
125 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
127 # does binutils support specific instructions?
128 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
129 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
131 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
132 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
134 LDFLAGS := -m elf_$(UTS_MACHINE)
137 KBUILD_CFLAGS += -pipe
138 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
139 KBUILD_CFLAGS += -Wno-sign-compare
141 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
142 # prevent gcc from generating any FP code by mistake
143 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
144 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
146 KBUILD_CFLAGS += $(mflags-y)
147 KBUILD_AFLAGS += $(mflags-y)
149 archscripts: scripts_basic
150 $(Q)$(MAKE) $(build)=arch/x86/tools relocs
153 # Syscall table generation
156 $(Q)$(MAKE) $(build)=arch/x86/syscalls all
161 head-y := arch/x86/kernel/head_$(BITS).o
162 head-y += arch/x86/kernel/head$(BITS).o
163 head-y += arch/x86/kernel/head.o
165 libs-y += arch/x86/lib/
167 # See arch/x86/Kbuild for content of core part of the kernel
170 # drivers-y are linked after core-y
171 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
172 drivers-$(CONFIG_PCI) += arch/x86/pci/
174 # must be linked after kernel/
175 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
177 # suspend and hibernation support
178 drivers-$(CONFIG_PM) += arch/x86/power/
180 drivers-$(CONFIG_FB) += arch/x86/video/
183 # boot loader support. Several targets are kept for legacy purposes
185 boot := arch/x86/boot
187 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
189 PHONY += bzImage $(BOOT_TARGETS)
191 # Default kernel to build
194 # KBUILD_IMAGE specify target image being built
195 KBUILD_IMAGE := $(boot)/bzImage
198 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
199 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
201 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
202 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
203 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
205 $(BOOT_TARGETS): vmlinux
206 $(Q)$(MAKE) $(build)=$(boot) $@
210 $(Q)$(MAKE) $(build)=$(boot) $@
212 PHONY += vdso_install
214 $(Q)$(MAKE) $(build)=arch/x86/vdso $@
217 $(Q)rm -rf $(objtree)/arch/i386
218 $(Q)rm -rf $(objtree)/arch/x86_64
219 $(Q)$(MAKE) $(clean)=$(boot)
220 $(Q)$(MAKE) $(clean)=arch/x86/tools
223 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
224 echo ' install - Install kernel using'
225 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
226 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
227 echo ' install to $$(INSTALL_PATH) and run lilo'
228 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
229 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
230 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
231 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
232 echo ' bzdisk/fdimage*/isoimage also accept:'
233 echo ' FDARGS="..." arguments for the booted kernel'
234 echo ' FDINITRD=file initrd for the booted kernel'