xref: /openbmc/linux/arch/x86/Makefile (revision e2f1cf25) 
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
42ifeq ($(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
71else
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        # Align jump targets to 1 byte, not the default 16 bytes:
81        KBUILD_CFLAGS += -falign-jumps=1
82
83        # Pack loops tightly as well:
84        KBUILD_CFLAGS += -falign-loops=1
85
86        # Don't autogenerate traditional x87 instructions
87        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
88        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
89
90	# Use -mpreferred-stack-boundary=3 if supported.
91	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
92
93	# Use -mskip-rax-setup if supported.
94	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
95
96        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
97        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
98        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
99
100        cflags-$(CONFIG_MCORE2) += \
101                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
102	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
103		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
104        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
105        KBUILD_CFLAGS += $(cflags-y)
106
107        KBUILD_CFLAGS += -mno-red-zone
108        KBUILD_CFLAGS += -mcmodel=kernel
109
110        # -funit-at-a-time shrinks the kernel .text considerably
111        # unfortunately it makes reading oopses harder.
112        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
113
114        # this works around some issues with generating unwind tables in older gccs
115        # newer gccs do it by default
116        KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
117endif
118
119# Make sure compiler does not have buggy stack-protector support.
120ifdef CONFIG_CC_STACKPROTECTOR
121	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
122        ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
123                $(warning stack-protector enabled but compiler support broken)
124        endif
125endif
126
127ifdef CONFIG_X86_X32
128	x32_ld_ok := $(call try-run,\
129			/bin/echo -e '1: .quad 1b' | \
130			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
131			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
132			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
133        ifeq ($(x32_ld_ok),y)
134                CONFIG_X86_X32_ABI := y
135                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
136                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
137        else
138                $(warning CONFIG_X86_X32 enabled but no binutils support)
139        endif
140endif
141export CONFIG_X86_X32_ABI
142
143# Don't unroll struct assignments with kmemcheck enabled
144ifeq ($(CONFIG_KMEMCHECK),y)
145	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
146endif
147
148# Stackpointer is addressed different for 32 bit and 64 bit x86
149sp-$(CONFIG_X86_32) := esp
150sp-$(CONFIG_X86_64) := rsp
151
152# does binutils support specific instructions?
153asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
154asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
155asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
156avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
157avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
158
159KBUILD_AFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
160KBUILD_CFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
161
162LDFLAGS := -m elf_$(UTS_MACHINE)
163
164# Speed up the build
165KBUILD_CFLAGS += -pipe
166# Workaround for a gcc prelease that unfortunately was shipped in a suse release
167KBUILD_CFLAGS += -Wno-sign-compare
168#
169KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
170# prevent gcc from generating any FP code by mistake
171KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
172KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
173
174KBUILD_CFLAGS += $(mflags-y)
175KBUILD_AFLAGS += $(mflags-y)
176
177archscripts: scripts_basic
178	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
179
180###
181# Syscall table generation
182
183archheaders:
184	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
185
186archprepare:
187ifeq ($(CONFIG_KEXEC_FILE),y)
188	$(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
189endif
190
191###
192# Kernel objects
193
194head-y := arch/x86/kernel/head_$(BITS).o
195head-y += arch/x86/kernel/head$(BITS).o
196head-y += arch/x86/kernel/head.o
197
198libs-y  += arch/x86/lib/
199
200# See arch/x86/Kbuild for content of core part of the kernel
201core-y += arch/x86/
202
203# drivers-y are linked after core-y
204drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
205drivers-$(CONFIG_PCI)            += arch/x86/pci/
206
207# must be linked after kernel/
208drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
209
210# suspend and hibernation support
211drivers-$(CONFIG_PM) += arch/x86/power/
212
213drivers-$(CONFIG_FB) += arch/x86/video/
214
215####
216# boot loader support. Several targets are kept for legacy purposes
217
218boot := arch/x86/boot
219
220BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
221
222PHONY += bzImage $(BOOT_TARGETS)
223
224# Default kernel to build
225all: bzImage
226
227# KBUILD_IMAGE specify target image being built
228KBUILD_IMAGE := $(boot)/bzImage
229
230bzImage: vmlinux
231ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
232	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
233endif
234	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
235	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
236	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
237
238$(BOOT_TARGETS): vmlinux
239	$(Q)$(MAKE) $(build)=$(boot) $@
240
241PHONY += install
242install:
243	$(Q)$(MAKE) $(build)=$(boot) $@
244
245PHONY += vdso_install
246vdso_install:
247	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
248
249archclean:
250	$(Q)rm -rf $(objtree)/arch/i386
251	$(Q)rm -rf $(objtree)/arch/x86_64
252	$(Q)$(MAKE) $(clean)=$(boot)
253	$(Q)$(MAKE) $(clean)=arch/x86/tools
254	$(Q)$(MAKE) $(clean)=arch/x86/purgatory
255
256define archhelp
257  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
258  echo  '  install      - Install kernel using'
259  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
260  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
261  echo  '                  install to $$(INSTALL_PATH) and run lilo'
262  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
263  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
264  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
265  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
266  echo  '                  bzdisk/fdimage*/isoimage also accept:'
267  echo  '                  FDARGS="..."  arguments for the booted kernel'
268  echo  '                  FDINITRD=file initrd for the booted kernel'
269endef
270