xref: /openbmc/linux/arch/x86/Makefile (revision 5bb7889f) 
1# Unified Makefile for i386 and x86_64
2
3# select defconfig based on actual architecture
4ifeq ($(ARCH),x86)
5  ifeq ($(shell uname -m),x86_64)
6        KBUILD_DEFCONFIG := x86_64_defconfig
7  else
8        KBUILD_DEFCONFIG := i386_defconfig
9  endif
10else
11        KBUILD_DEFCONFIG := $(ARCH)_defconfig
12endif
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, we need to play evil and unreliable tricks to
19# attempt to ensure that our asm(".code16gcc") is first in the asm
20# output.
21CODE16GCC_CFLAGS := -m32 -include $(srctree)/arch/x86/boot/code16gcc.h \
22		    $(call cc-option, -fno-toplevel-reorder,\
23		      $(call cc-option, -fno-unit-at-a-time))
24M16_CFLAGS	 := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
25
26REALMODE_CFLAGS	:= $(M16_CFLAGS) -g -Os -D__KERNEL__ \
27		   -DDISABLE_BRANCH_PROFILING \
28		   -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
29		   -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
30		   -mno-mmx -mno-sse \
31		   $(call cc-option, -ffreestanding) \
32		   $(call cc-option, -fno-stack-protector) \
33		   $(call cc-option, -mpreferred-stack-boundary=2)
34export REALMODE_CFLAGS
35
36# BITS is used as extension for files which are available in a 32 bit
37# and a 64 bit version to simplify shared Makefiles.
38# e.g.: obj-y += foo_$(BITS).o
39export BITS
40
41ifdef CONFIG_X86_NEED_RELOCS
42        LDFLAGS_vmlinux := --emit-relocs
43endif
44
45ifeq ($(CONFIG_X86_32),y)
46        BITS := 32
47        UTS_MACHINE := i386
48        CHECKFLAGS += -D__i386__
49
50        biarch := $(call cc-option,-m32)
51        KBUILD_AFLAGS += $(biarch)
52        KBUILD_CFLAGS += $(biarch)
53
54        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
55
56        # Don't autogenerate MMX or SSE instructions
57        KBUILD_CFLAGS += -mno-mmx -mno-sse
58
59        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
60        # with nonstandard options
61        KBUILD_CFLAGS += -fno-pic
62
63        # prevent gcc from keeping the stack 16 byte aligned
64        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
65
66        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
67        # a lot more stack due to the lack of sharing of stacklots:
68        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
69				$(call cc-option,-fno-unit-at-a-time))
70
71        # CPU-specific tuning. Anything which can be shared with UML should go here.
72        include $(srctree)/arch/x86/Makefile_32.cpu
73        KBUILD_CFLAGS += $(cflags-y)
74
75        # temporary until string.h is fixed
76        KBUILD_CFLAGS += -ffreestanding
77else
78        BITS := 64
79        UTS_MACHINE := x86_64
80        CHECKFLAGS += -D__x86_64__ -m64
81
82        biarch := -m64
83        KBUILD_AFLAGS += -m64
84        KBUILD_CFLAGS += -m64
85
86        # Don't autogenerate traditional x87, MMX or SSE instructions
87        KBUILD_CFLAGS += -mno-mmx -mno-sse
88        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
89        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
90
91	# Use -mpreferred-stack-boundary=3 if supported.
92	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
93
94        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
95        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
96        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
97
98        cflags-$(CONFIG_MCORE2) += \
99                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
100	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
101		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
102        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
103        KBUILD_CFLAGS += $(cflags-y)
104
105        KBUILD_CFLAGS += -mno-red-zone
106        KBUILD_CFLAGS += -mcmodel=kernel
107
108        # -funit-at-a-time shrinks the kernel .text considerably
109        # unfortunately it makes reading oopses harder.
110        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
111
112        # this works around some issues with generating unwind tables in older gccs
113        # newer gccs do it by default
114        KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
115endif
116
117# Make sure compiler does not have buggy stack-protector support.
118ifdef CONFIG_CC_STACKPROTECTOR
119	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
120        ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
121                $(warning stack-protector enabled but compiler support broken)
122        endif
123endif
124
125ifdef CONFIG_X86_X32
126	x32_ld_ok := $(call try-run,\
127			/bin/echo -e '1: .quad 1b' | \
128			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
129			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
130			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
131        ifeq ($(x32_ld_ok),y)
132                CONFIG_X86_X32_ABI := y
133                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
134                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
135        else
136                $(warning CONFIG_X86_X32 enabled but no binutils support)
137        endif
138endif
139export CONFIG_X86_X32_ABI
140
141# Don't unroll struct assignments with kmemcheck enabled
142ifeq ($(CONFIG_KMEMCHECK),y)
143	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
144endif
145
146# Stackpointer is addressed different for 32 bit and 64 bit x86
147sp-$(CONFIG_X86_32) := esp
148sp-$(CONFIG_X86_64) := rsp
149
150# do binutils support CFI?
151cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
152# is .cfi_signal_frame supported too?
153cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
154cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
155
156# does binutils support specific instructions?
157asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
158asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
159avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
160avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
161
162KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
163KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
164
165LDFLAGS := -m elf_$(UTS_MACHINE)
166
167# Speed up the build
168KBUILD_CFLAGS += -pipe
169# Workaround for a gcc prelease that unfortunately was shipped in a suse release
170KBUILD_CFLAGS += -Wno-sign-compare
171#
172KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
173# prevent gcc from generating any FP code by mistake
174KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
175KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
176
177KBUILD_CFLAGS += $(mflags-y)
178KBUILD_AFLAGS += $(mflags-y)
179
180archscripts: scripts_basic
181	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
182
183###
184# Syscall table generation
185
186archheaders:
187	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
188
189###
190# Kernel objects
191
192head-y := arch/x86/kernel/head_$(BITS).o
193head-y += arch/x86/kernel/head$(BITS).o
194head-y += arch/x86/kernel/head.o
195
196libs-y  += arch/x86/lib/
197
198# See arch/x86/Kbuild for content of core part of the kernel
199core-y += arch/x86/
200
201# drivers-y are linked after core-y
202drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
203drivers-$(CONFIG_PCI)            += arch/x86/pci/
204
205# must be linked after kernel/
206drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
207
208# suspend and hibernation support
209drivers-$(CONFIG_PM) += arch/x86/power/
210
211drivers-$(CONFIG_FB) += arch/x86/video/
212
213####
214# boot loader support. Several targets are kept for legacy purposes
215
216boot := arch/x86/boot
217
218BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
219
220PHONY += bzImage $(BOOT_TARGETS)
221
222# Default kernel to build
223all: bzImage
224
225# KBUILD_IMAGE specify target image being built
226KBUILD_IMAGE := $(boot)/bzImage
227
228bzImage: vmlinux
229ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
230	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
231endif
232	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
233	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
234	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
235
236$(BOOT_TARGETS): vmlinux
237	$(Q)$(MAKE) $(build)=$(boot) $@
238
239PHONY += install
240install:
241	$(Q)$(MAKE) $(build)=$(boot) $@
242
243PHONY += vdso_install
244vdso_install:
245	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
246
247archclean:
248	$(Q)rm -rf $(objtree)/arch/i386
249	$(Q)rm -rf $(objtree)/arch/x86_64
250	$(Q)$(MAKE) $(clean)=$(boot)
251	$(Q)$(MAKE) $(clean)=arch/x86/tools
252
253PHONY += kvmconfig
254kvmconfig:
255	$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
256	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config
257	$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
258
259define archhelp
260  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
261  echo  '  install      - Install kernel using'
262  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
263  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
264  echo  '                  install to $$(INSTALL_PATH) and run lilo'
265  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
266  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
267  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
268  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
269  echo  '                  bzdisk/fdimage*/isoimage also accept:'
270  echo  '                  FDARGS="..."  arguments for the booted kernel'
271  echo  '                  FDINITRD=file initrd for the booted kernel'
272  echo  '  kvmconfig	- Enable additional options for guest kernel support'
273endef
274