| 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 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,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1) |
| 152 | asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1) |
| 153 | avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) |
| 154 | avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1) |
| 155 | |
| 156 | KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) |
| 157 | KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) |
| 158 | |
| 159 | LDFLAGS := -m elf_$(UTS_MACHINE) |
| 160 | |
| 161 | # Speed up the build |
| 162 | KBUILD_CFLAGS += -pipe |
| 163 | # Workaround for a gcc prelease that unfortunately was shipped in a suse release |
| 164 | KBUILD_CFLAGS += -Wno-sign-compare |
| 165 | # |
| 166 | KBUILD_CFLAGS += -fno-asynchronous-unwind-tables |
| 167 | # prevent gcc from generating any FP code by mistake |
| 168 | KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow |
| 169 | KBUILD_CFLAGS += $(call cc-option,-mno-avx,) |
| 170 | |
| 171 | KBUILD_CFLAGS += $(mflags-y) |
| 172 | KBUILD_AFLAGS += $(mflags-y) |
| 173 | |
| 174 | archscripts: scripts_basic |
| 175 | $(Q)$(MAKE) $(build)=arch/x86/tools relocs |
| 176 | |
| 177 | ### |
| 178 | # Syscall table generation |
| 179 | |
| 180 | archheaders: |
| 181 | $(Q)$(MAKE) $(build)=arch/x86/syscalls all |
| 182 | |
| 183 | archprepare: |
| 184 | ifeq ($(CONFIG_KEXEC_FILE),y) |
| 185 | $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c |
| 186 | endif |
| 187 | |
| 188 | ### |
| 189 | # Kernel objects |
| 190 | |
| 191 | head-y := arch/x86/kernel/head_$(BITS).o |
| 192 | head-y += arch/x86/kernel/head$(BITS).o |
| 193 | head-y += arch/x86/kernel/head.o |
| 194 | |
| 195 | libs-y += arch/x86/lib/ |
| 196 | |
| 197 | # See arch/x86/Kbuild for content of core part of the kernel |
| 198 | core-y += arch/x86/ |
| 199 | |
| 200 | # drivers-y are linked after core-y |
| 201 | drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ |
| 202 | drivers-$(CONFIG_PCI) += arch/x86/pci/ |
| 203 | |
| 204 | # must be linked after kernel/ |
| 205 | drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ |
| 206 | |
| 207 | # suspend and hibernation support |
| 208 | drivers-$(CONFIG_PM) += arch/x86/power/ |
| 209 | |
| 210 | drivers-$(CONFIG_FB) += arch/x86/video/ |
| 211 | |
| 212 | #### |
| 213 | # boot loader support. Several targets are kept for legacy purposes |
| 214 | |
| 215 | boot := arch/x86/boot |
| 216 | |
| 217 | BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage |
| 218 | |
| 219 | PHONY += bzImage $(BOOT_TARGETS) |
| 220 | |
| 221 | # Default kernel to build |
| 222 | all: bzImage |
| 223 | |
| 224 | # KBUILD_IMAGE specify target image being built |
| 225 | KBUILD_IMAGE := $(boot)/bzImage |
| 226 | |
| 227 | bzImage: vmlinux |
| 228 | ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) |
| 229 | $(Q)$(MAKE) $(build)=arch/x86/tools posttest |
| 230 | endif |
| 231 | $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) |
| 232 | $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot |
| 233 | $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ |
| 234 | |
| 235 | $(BOOT_TARGETS): vmlinux |
| 236 | $(Q)$(MAKE) $(build)=$(boot) $@ |
| 237 | |
| 238 | PHONY += install |
| 239 | install: |
| 240 | $(Q)$(MAKE) $(build)=$(boot) $@ |
| 241 | |
| 242 | PHONY += vdso_install |
| 243 | vdso_install: |
| 244 | $(Q)$(MAKE) $(build)=arch/x86/vdso $@ |
| 245 | |
| 246 | archclean: |
| 247 | $(Q)rm -rf $(objtree)/arch/i386 |
| 248 | $(Q)rm -rf $(objtree)/arch/x86_64 |
| 249 | $(Q)$(MAKE) $(clean)=$(boot) |
| 250 | $(Q)$(MAKE) $(clean)=arch/x86/tools |
| 251 | $(Q)$(MAKE) $(clean)=arch/x86/purgatory |
| 252 | |
| 253 | define archhelp |
| 254 | echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' |
| 255 | echo ' install - Install kernel using' |
| 256 | echo ' (your) ~/bin/$(INSTALLKERNEL) or' |
| 257 | echo ' (distribution) /sbin/$(INSTALLKERNEL) or' |
| 258 | echo ' install to $$(INSTALL_PATH) and run lilo' |
| 259 | echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' |
| 260 | echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' |
| 261 | echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' |
| 262 | echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' |
| 263 | echo ' bzdisk/fdimage*/isoimage also accept:' |
| 264 | echo ' FDARGS="..." arguments for the booted kernel' |
| 265 | echo ' FDINITRD=file initrd for the booted kernel' |
| 266 | endef |