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TOMOYO Linux Cross Reference
Linux/arch/x86/Makefile

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  1 # Unified Makefile for i386 and x86_64
  2 
  3 # select defconfig based on actual architecture
  4 ifeq ($(ARCH),x86)
  5   ifeq ($(shell uname -m),x86_64)
  6         KBUILD_DEFCONFIG := x86_64_defconfig
  7   else
  8         KBUILD_DEFCONFIG := i386_defconfig
  9   endif
 10 else
 11         KBUILD_DEFCONFIG := $(ARCH)_defconfig
 12 endif
 13 
 14 # How to compile the 16-bit code.  Note we always compile for -march=i386;
 15 # that way we can complain to the user if the CPU is insufficient.
 16 #
 17 # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
 18 # older versions of GCC, include an *assembly* header to make sure that
 19 # gcc doesn't play any games behind our back.
 20 CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
 21 M16_CFLAGS       := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
 22 
 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 \
 27                    -mno-mmx -mno-sse \
 28                    $(call cc-option, -ffreestanding) \
 29                    $(call cc-option, -fno-stack-protector) \
 30                    $(call cc-option, -mpreferred-stack-boundary=2)
 31 export REALMODE_CFLAGS
 32 
 33 # BITS is used as extension for files which are available in a 32 bit
 34 # and a 64 bit version to simplify shared Makefiles.
 35 # e.g.: obj-y += foo_$(BITS).o
 36 export BITS
 37 
 38 ifdef CONFIG_X86_NEED_RELOCS
 39         LDFLAGS_vmlinux := --emit-relocs
 40 endif
 41 
 42 ifeq ($(CONFIG_X86_32),y)
 43         BITS := 32
 44         UTS_MACHINE := i386
 45         CHECKFLAGS += -D__i386__
 46 
 47         biarch := $(call cc-option,-m32)
 48         KBUILD_AFLAGS += $(biarch)
 49         KBUILD_CFLAGS += $(biarch)
 50 
 51         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
 52 
 53         # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
 54         # with nonstandard options
 55         KBUILD_CFLAGS += -fno-pic
 56 
 57         # prevent gcc from keeping the stack 16 byte aligned
 58         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
 59 
 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))
 64 
 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)
 68 
 69         # temporary until string.h is fixed
 70         KBUILD_CFLAGS += -ffreestanding
 71 else
 72         BITS := 64
 73         UTS_MACHINE := x86_64
 74         CHECKFLAGS += -D__x86_64__ -m64
 75 
 76         biarch := -m64
 77         KBUILD_AFLAGS += -m64
 78         KBUILD_CFLAGS += -m64
 79 
 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)
 83 
 84         # Use -mpreferred-stack-boundary=3 if supported.
 85         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
 86 
 87         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
 88         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
 89         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
 90 
 91         cflags-$(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)
 97 
 98         KBUILD_CFLAGS += -mno-red-zone
 99         KBUILD_CFLAGS += -mcmodel=kernel
100 
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)
104 
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)
108 endif
109 
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)
115         endif
116 endif
117 
118 ifdef CONFIG_X86_X32
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
128         else
129                 $(warning CONFIG_X86_X32 enabled but no binutils support)
130         endif
131 endif
132 export CONFIG_X86_X32_ABI
133 
134 # Don't unroll struct assignments with kmemcheck enabled
135 ifeq ($(CONFIG_KMEMCHECK),y)
136         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
137 endif
138 
139 # Stackpointer is addressed different for 32 bit and 64 bit x86
140 sp-$(CONFIG_X86_32) := esp
141 sp-$(CONFIG_X86_64) := rsp
142 
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)
148 
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)
154 
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)
157 
158 LDFLAGS := -m elf_$(UTS_MACHINE)
159 
160 # Speed up the build
161 KBUILD_CFLAGS += -pipe
162 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
163 KBUILD_CFLAGS += -Wno-sign-compare
164 #
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,)
169 
170 KBUILD_CFLAGS += $(mflags-y)
171 KBUILD_AFLAGS += $(mflags-y)
172 
173 archscripts: scripts_basic
174         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
175 
176 ###
177 # Syscall table generation
178 
179 archheaders:
180         $(Q)$(MAKE) $(build)=arch/x86/syscalls all
181 
182 archprepare:
183 ifeq ($(CONFIG_KEXEC_FILE),y)
184         $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
185 endif
186 
187 ###
188 # Kernel objects
189 
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
193 
194 libs-y  += arch/x86/lib/
195 
196 # See arch/x86/Kbuild for content of core part of the kernel
197 core-y += arch/x86/
198 
199 # drivers-y are linked after core-y
200 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
201 drivers-$(CONFIG_PCI)            += arch/x86/pci/
202 
203 # must be linked after kernel/
204 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
205 
206 # suspend and hibernation support
207 drivers-$(CONFIG_PM) += arch/x86/power/
208 
209 drivers-$(CONFIG_FB) += arch/x86/video/
210 
211 ####
212 # boot loader support. Several targets are kept for legacy purposes
213 
214 boot := arch/x86/boot
215 
216 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
217 
218 PHONY += bzImage $(BOOT_TARGETS)
219 
220 # Default kernel to build
221 all: bzImage
222 
223 # KBUILD_IMAGE specify target image being built
224 KBUILD_IMAGE := $(boot)/bzImage
225 
226 bzImage: vmlinux
227 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
228         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
229 endif
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/$@
233 
234 $(BOOT_TARGETS): vmlinux
235         $(Q)$(MAKE) $(build)=$(boot) $@
236 
237 PHONY += install
238 install:
239         $(Q)$(MAKE) $(build)=$(boot) $@
240 
241 PHONY += vdso_install
242 vdso_install:
243         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
244 
245 archclean:
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
251 
252 define archhelp
253   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
254   echo  '  install      - Install kernel using'
255   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
256   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
257   echo  '                  install to $$(INSTALL_PATH) and run lilo'
258   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
259   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
260   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
261   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
262   echo  '                  bzdisk/fdimage*/isoimage also accept:'
263   echo  '                  FDARGS="..."  arguments for the booted kernel'
264   echo  '                  FDINITRD=file initrd for the booted kernel'
265 endef

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