xref: /openbmc/linux/arch/x86/Makefile (revision a2cce7a9) 
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 := $(ARCH)_defconfig
12endif
13
14# How to compile the 16-bit code.  Note we always compile for -march=i386;
15# that way we can complain to the user if the CPU is insufficient.
16#
17# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
18# older versions of GCC, include an *assembly* header to make sure that
19# gcc doesn't play any games behind our back.
20CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
21M16_CFLAGS	 := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
22
23REALMODE_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		   $(call cc-option, -mpreferred-stack-boundary=2)
31export REALMODE_CFLAGS
32
33# BITS is used as extension for files which are available in a 32 bit
34# and a 64 bit version to simplify shared Makefiles.
35# e.g.: obj-y += foo_$(BITS).o
36export BITS
37
38ifdef CONFIG_X86_NEED_RELOCS
39        LDFLAGS_vmlinux := --emit-relocs
40endif
41
42#
43# Prevent GCC from generating any FP code by mistake.
44#
45# This must happen before we try the -mpreferred-stack-boundary, see:
46#
47#    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
48#
49KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
50KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
51
52ifeq ($(CONFIG_X86_32),y)
53        BITS := 32
54        UTS_MACHINE := i386
55        CHECKFLAGS += -D__i386__
56
57        biarch := $(call cc-option,-m32)
58        KBUILD_AFLAGS += $(biarch)
59        KBUILD_CFLAGS += $(biarch)
60
61        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
62
63        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
64        # with nonstandard options
65        KBUILD_CFLAGS += -fno-pic
66
67        # prevent gcc from keeping the stack 16 byte aligned
68        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
69
70        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
71        # a lot more stack due to the lack of sharing of stacklots:
72        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
73				$(call cc-option,-fno-unit-at-a-time))
74
75        # CPU-specific tuning. Anything which can be shared with UML should go here.
76        include arch/x86/Makefile_32.cpu
77        KBUILD_CFLAGS += $(cflags-y)
78
79        # temporary until string.h is fixed
80        KBUILD_CFLAGS += -ffreestanding
81else
82        BITS := 64
83        UTS_MACHINE := x86_64
84        CHECKFLAGS += -D__x86_64__ -m64
85
86        biarch := -m64
87        KBUILD_AFLAGS += -m64
88        KBUILD_CFLAGS += -m64
89
90        # Align jump targets to 1 byte, not the default 16 bytes:
91        KBUILD_CFLAGS += -falign-jumps=1
92
93        # Pack loops tightly as well:
94        KBUILD_CFLAGS += -falign-loops=1
95
96        # Don't autogenerate traditional x87 instructions
97        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
98        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
99
100	# Use -mpreferred-stack-boundary=3 if supported.
101	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
102
103	# Use -mskip-rax-setup if supported.
104	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
105
106        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
107        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
108        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
109
110        cflags-$(CONFIG_MCORE2) += \
111                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
112	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
113		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
114        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
115        KBUILD_CFLAGS += $(cflags-y)
116
117        KBUILD_CFLAGS += -mno-red-zone
118        KBUILD_CFLAGS += -mcmodel=kernel
119
120        # -funit-at-a-time shrinks the kernel .text considerably
121        # unfortunately it makes reading oopses harder.
122        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
123
124        # this works around some issues with generating unwind tables in older gccs
125        # newer gccs do it by default
126        KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
127endif
128
129# Make sure compiler does not have buggy stack-protector support.
130ifdef CONFIG_CC_STACKPROTECTOR
131	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
132        ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
133                $(warning stack-protector enabled but compiler support broken)
134        endif
135endif
136
137ifdef CONFIG_X86_X32
138	x32_ld_ok := $(call try-run,\
139			/bin/echo -e '1: .quad 1b' | \
140			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
141			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
142			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
143        ifeq ($(x32_ld_ok),y)
144                CONFIG_X86_X32_ABI := y
145                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
146                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
147        else
148                $(warning CONFIG_X86_X32 enabled but no binutils support)
149        endif
150endif
151export CONFIG_X86_X32_ABI
152
153# Don't unroll struct assignments with kmemcheck enabled
154ifeq ($(CONFIG_KMEMCHECK),y)
155	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
156endif
157
158# Stackpointer is addressed different for 32 bit and 64 bit x86
159sp-$(CONFIG_X86_32) := esp
160sp-$(CONFIG_X86_64) := rsp
161
162# does binutils support specific instructions?
163asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
164asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
165asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
166avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
167avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
168
169KBUILD_AFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
170KBUILD_CFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
171
172LDFLAGS := -m elf_$(UTS_MACHINE)
173
174# Speed up the build
175KBUILD_CFLAGS += -pipe
176# Workaround for a gcc prelease that unfortunately was shipped in a suse release
177KBUILD_CFLAGS += -Wno-sign-compare
178#
179KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
180
181KBUILD_CFLAGS += $(mflags-y)
182KBUILD_AFLAGS += $(mflags-y)
183
184archscripts: scripts_basic
185	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
186
187###
188# Syscall table generation
189
190archheaders:
191	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
192
193archprepare:
194ifeq ($(CONFIG_KEXEC_FILE),y)
195	$(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
196endif
197
198###
199# Kernel objects
200
201head-y := arch/x86/kernel/head_$(BITS).o
202head-y += arch/x86/kernel/head$(BITS).o
203head-y += arch/x86/kernel/head.o
204
205libs-y  += arch/x86/lib/
206
207# See arch/x86/Kbuild for content of core part of the kernel
208core-y += arch/x86/
209
210# drivers-y are linked after core-y
211drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
212drivers-$(CONFIG_PCI)            += arch/x86/pci/
213
214# must be linked after kernel/
215drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
216
217# suspend and hibernation support
218drivers-$(CONFIG_PM) += arch/x86/power/
219
220drivers-$(CONFIG_FB) += arch/x86/video/
221
222drivers-$(CONFIG_RAS) += arch/x86/ras/
223
224####
225# boot loader support. Several targets are kept for legacy purposes
226
227boot := arch/x86/boot
228
229BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
230
231PHONY += bzImage $(BOOT_TARGETS)
232
233# Default kernel to build
234all: bzImage
235
236# KBUILD_IMAGE specify target image being built
237KBUILD_IMAGE := $(boot)/bzImage
238
239bzImage: vmlinux
240ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
241	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
242endif
243	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
244	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
245	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
246
247$(BOOT_TARGETS): vmlinux
248	$(Q)$(MAKE) $(build)=$(boot) $@
249
250PHONY += install
251install:
252	$(Q)$(MAKE) $(build)=$(boot) $@
253
254PHONY += vdso_install
255vdso_install:
256	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
257
258archclean:
259	$(Q)rm -rf $(objtree)/arch/i386
260	$(Q)rm -rf $(objtree)/arch/x86_64
261	$(Q)$(MAKE) $(clean)=$(boot)
262	$(Q)$(MAKE) $(clean)=arch/x86/tools
263	$(Q)$(MAKE) $(clean)=arch/x86/purgatory
264
265define archhelp
266  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
267  echo  '  install      - Install kernel using'
268  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
269  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
270  echo  '                  install to $$(INSTALL_PATH) and run lilo'
271  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
272  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
273  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
274  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
275  echo  '                  bzdisk/fdimage*/isoimage also accept:'
276  echo  '                  FDARGS="..."  arguments for the booted kernel'
277  echo  '                  FDINITRD=file initrd for the booted kernel'
278endef
279