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 $(srctree)/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,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
152 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
153 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
155 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
156 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
158 LDFLAGS := -m elf_$(UTS_MACHINE)
161 KBUILD_CFLAGS += -pipe
162 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
163 KBUILD_CFLAGS += -Wno-sign-compare
165 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
166 # prevent gcc from generating any FP code by mistake
167 KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
168 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
170 KBUILD_CFLAGS += $(mflags-y)
171 KBUILD_AFLAGS += $(mflags-y)
173 archscripts: scripts_basic
174 $(Q)$(MAKE) $(build)=arch/x86/tools relocs
177 # Syscall table generation
180 $(Q)$(MAKE) $(build)=arch/x86/syscalls all
183 ifeq ($(CONFIG_KEXEC_FILE),y)
184 $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
190 head-y := arch/x86/kernel/head_$(BITS).o
191 head-y += arch/x86/kernel/head$(BITS).o
192 head-y += arch/x86/kernel/head.o
194 libs-y += arch/x86/lib/
196 # See arch/x86/Kbuild for content of core part of the kernel
199 # drivers-y are linked after core-y
200 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
201 drivers-$(CONFIG_PCI) += arch/x86/pci/
203 # must be linked after kernel/
204 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
206 # suspend and hibernation support
207 drivers-$(CONFIG_PM) += arch/x86/power/
209 drivers-$(CONFIG_FB) += arch/x86/video/
212 # boot loader support. Several targets are kept for legacy purposes
214 boot := arch/x86/boot
216 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
218 PHONY += bzImage $(BOOT_TARGETS)
220 # Default kernel to build
223 # KBUILD_IMAGE specify target image being built
224 KBUILD_IMAGE := $(boot)/bzImage
227 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
228 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
230 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
231 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
232 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
234 $(BOOT_TARGETS): vmlinux
235 $(Q)$(MAKE) $(build)=$(boot) $@
239 $(Q)$(MAKE) $(build)=$(boot) $@
241 PHONY += vdso_install
243 $(Q)$(MAKE) $(build)=arch/x86/vdso $@
246 $(Q)rm -rf $(objtree)/arch/i386
247 $(Q)rm -rf $(objtree)/arch/x86_64
248 $(Q)$(MAKE) $(clean)=$(boot)
249 $(Q)$(MAKE) $(clean)=arch/x86/tools
250 $(Q)$(MAKE) $(clean)=arch/x86/purgatory
254 $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
255 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config
256 $(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
259 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
260 echo ' install - Install kernel using'
261 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
262 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
263 echo ' install to $$(INSTALL_PATH) and run lilo'
264 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
265 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
266 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
267 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
268 echo ' bzdisk/fdimage*/isoimage also accept:'
269 echo ' FDARGS="..." arguments for the booted kernel'
270 echo ' FDINITRD=file initrd for the booted kernel'
271 echo ' kvmconfig - Enable additional options for guest kernel support'