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.
16 REALMODE_CFLAGS := -m32 -g -Os -D__KERNEL__ -DDISABLE_BRANCH_PROFILING \
17 -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
18 -include $(srctree)/arch/x86/boot/code16gcc.h \
19 -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
21 $(call cc-option, -ffreestanding) \
22 $(call cc-option, -fno-toplevel-reorder,\
23 $(call cc-option, -fno-unit-at-a-time)) \
24 $(call cc-option, -fno-stack-protector) \
25 $(call cc-option, -mpreferred-stack-boundary=2)
26 export REALMODE_CFLAGS
28 # BITS is used as extension for files which are available in a 32 bit
29 # and a 64 bit version to simplify shared Makefiles.
30 # e.g.: obj-y += foo_$(BITS).o
33 ifdef CONFIG_X86_NEED_RELOCS
34 LDFLAGS_vmlinux := --emit-relocs
37 ifeq ($(CONFIG_X86_32),y)
40 CHECKFLAGS += -D__i386__
42 biarch := $(call cc-option,-m32)
43 KBUILD_AFLAGS += $(biarch)
44 KBUILD_CFLAGS += $(biarch)
46 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
48 # Don't autogenerate MMX or SSE instructions
49 KBUILD_CFLAGS += -mno-mmx -mno-sse
51 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
52 # with nonstandard options
53 KBUILD_CFLAGS += -fno-pic
55 # prevent gcc from keeping the stack 16 byte aligned
56 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
58 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
59 # a lot more stack due to the lack of sharing of stacklots:
60 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
61 $(call cc-option,-fno-unit-at-a-time))
63 # CPU-specific tuning. Anything which can be shared with UML should go here.
64 include $(srctree)/arch/x86/Makefile_32.cpu
65 KBUILD_CFLAGS += $(cflags-y)
67 # temporary until string.h is fixed
68 KBUILD_CFLAGS += -ffreestanding
72 CHECKFLAGS += -D__x86_64__ -m64
77 # Don't autogenerate MMX or SSE instructions
78 KBUILD_CFLAGS += -mno-mmx -mno-sse
80 # Use -mpreferred-stack-boundary=3 if supported.
81 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
83 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
84 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
85 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
87 cflags-$(CONFIG_MCORE2) += \
88 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
89 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
90 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
91 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
92 KBUILD_CFLAGS += $(cflags-y)
94 KBUILD_CFLAGS += -mno-red-zone
95 KBUILD_CFLAGS += -mcmodel=kernel
97 # -funit-at-a-time shrinks the kernel .text considerably
98 # unfortunately it makes reading oopses harder.
99 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
101 # this works around some issues with generating unwind tables in older gccs
102 # newer gccs do it by default
103 KBUILD_CFLAGS += -maccumulate-outgoing-args
106 # Make sure compiler does not have buggy stack-protector support.
107 ifdef CONFIG_CC_STACKPROTECTOR
108 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
109 ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
110 $(warning stack-protector enabled but compiler support broken)
115 x32_ld_ok := $(call try-run,\
116 /bin/echo -e '1: .quad 1b' | \
117 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
118 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
119 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
120 ifeq ($(x32_ld_ok),y)
121 CONFIG_X86_X32_ABI := y
122 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
123 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
125 $(warning CONFIG_X86_X32 enabled but no binutils support)
128 export CONFIG_X86_X32_ABI
130 # Don't unroll struct assignments with kmemcheck enabled
131 ifeq ($(CONFIG_KMEMCHECK),y)
132 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
135 # Stackpointer is addressed different for 32 bit and 64 bit x86
136 sp-$(CONFIG_X86_32) := esp
137 sp-$(CONFIG_X86_64) := rsp
139 # do binutils support CFI?
140 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
141 # is .cfi_signal_frame supported too?
142 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
143 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
145 # does binutils support specific instructions?
146 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
147 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
148 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
150 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
151 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
153 LDFLAGS := -m elf_$(UTS_MACHINE)
156 KBUILD_CFLAGS += -pipe
157 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
158 KBUILD_CFLAGS += -Wno-sign-compare
160 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
161 # prevent gcc from generating any FP code by mistake
162 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
163 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
165 KBUILD_CFLAGS += $(mflags-y)
166 KBUILD_AFLAGS += $(mflags-y)
168 archscripts: scripts_basic
169 $(Q)$(MAKE) $(build)=arch/x86/tools relocs
172 # Syscall table generation
175 $(Q)$(MAKE) $(build)=arch/x86/syscalls all
180 head-y := arch/x86/kernel/head_$(BITS).o
181 head-y += arch/x86/kernel/head$(BITS).o
182 head-y += arch/x86/kernel/head.o
184 libs-y += arch/x86/lib/
186 # See arch/x86/Kbuild for content of core part of the kernel
189 # drivers-y are linked after core-y
190 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
191 drivers-$(CONFIG_PCI) += arch/x86/pci/
193 # must be linked after kernel/
194 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
196 # suspend and hibernation support
197 drivers-$(CONFIG_PM) += arch/x86/power/
199 drivers-$(CONFIG_FB) += arch/x86/video/
202 # boot loader support. Several targets are kept for legacy purposes
204 boot := arch/x86/boot
206 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
208 PHONY += bzImage $(BOOT_TARGETS)
210 # Default kernel to build
213 # KBUILD_IMAGE specify target image being built
214 KBUILD_IMAGE := $(boot)/bzImage
217 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
218 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
220 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
221 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
222 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
224 $(BOOT_TARGETS): vmlinux
225 $(Q)$(MAKE) $(build)=$(boot) $@
229 $(Q)$(MAKE) $(build)=$(boot) $@
231 PHONY += vdso_install
233 $(Q)$(MAKE) $(build)=arch/x86/vdso $@
236 $(Q)rm -rf $(objtree)/arch/i386
237 $(Q)rm -rf $(objtree)/arch/x86_64
238 $(Q)$(MAKE) $(clean)=$(boot)
239 $(Q)$(MAKE) $(clean)=arch/x86/tools
243 $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
244 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config arch/x86/configs/kvm_guest.config
245 $(Q)yes "" | $(MAKE) oldconfig
248 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
249 echo ' install - Install kernel using'
250 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
251 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
252 echo ' install to $$(INSTALL_PATH) and run lilo'
253 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
254 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
255 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
256 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
257 echo ' bzdisk/fdimage*/isoimage also accept:'
258 echo ' FDARGS="..." arguments for the booted kernel'
259 echo ' FDINITRD=file initrd for the booted kernel'
260 echo ' kvmconfig - Enable additional options for guest kernel support'