xref: /openbmc/linux/arch/x86/Makefile (revision 020c5260) 
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 += $(call cc-option,-falign-jumps=1)
92
93        # Pack loops tightly as well:
94        KBUILD_CFLAGS += $(call cc-option,-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)
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#
147# If the function graph tracer is used with mcount instead of fentry,
148# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
149# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
150#
151ifdef CONFIG_FUNCTION_GRAPH_TRACER
152  ifndef CONFIG_HAVE_FENTRY
153	ACCUMULATE_OUTGOING_ARGS := 1
154  else
155    ifeq ($(call cc-option-yn, -mfentry), n)
156	ACCUMULATE_OUTGOING_ARGS := 1
157
158	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
159	# If '-Os' is enabled, disable it and print a warning.
160        ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
161          undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
162	  $(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE.  Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
163        endif
164
165    endif
166  endif
167endif
168
169#
170# Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent a
171# GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226).  There's no way
172# to test for this bug at compile-time because the test case needs to execute,
173# which is a no-go for cross compilers.  So check the GCC version instead.
174#
175ifdef CONFIG_JUMP_LABEL
176  ifneq ($(ACCUMULATE_OUTGOING_ARGS), 1)
177	ACCUMULATE_OUTGOING_ARGS = $(call cc-if-fullversion, -lt, 040502, 1)
178  endif
179endif
180
181ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
182	# This compiler flag is not supported by Clang:
183	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
184endif
185
186# Stackpointer is addressed different for 32 bit and 64 bit x86
187sp-$(CONFIG_X86_32) := esp
188sp-$(CONFIG_X86_64) := rsp
189
190# do binutils support CFI?
191cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
192# is .cfi_signal_frame supported too?
193cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
194cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
195
196# does binutils support specific instructions?
197asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
198asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
199asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
200avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
201avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
202avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
203sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
204sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
205
206KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
207KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
208
209LDFLAGS := -m elf_$(UTS_MACHINE)
210
211# Speed up the build
212KBUILD_CFLAGS += -pipe
213# Workaround for a gcc prelease that unfortunately was shipped in a suse release
214KBUILD_CFLAGS += -Wno-sign-compare
215#
216KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
217
218KBUILD_CFLAGS += $(mflags-y)
219KBUILD_AFLAGS += $(mflags-y)
220
221archscripts: scripts_basic
222	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
223
224###
225# Syscall table generation
226
227archheaders:
228	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
229
230archprepare:
231ifeq ($(CONFIG_KEXEC_FILE),y)
232	$(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
233endif
234
235###
236# Kernel objects
237
238head-y := arch/x86/kernel/head_$(BITS).o
239head-y += arch/x86/kernel/head$(BITS).o
240head-y += arch/x86/kernel/ebda.o
241head-y += arch/x86/kernel/platform-quirks.o
242
243libs-y  += arch/x86/lib/
244
245# See arch/x86/Kbuild for content of core part of the kernel
246core-y += arch/x86/
247
248# drivers-y are linked after core-y
249drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
250drivers-$(CONFIG_PCI)            += arch/x86/pci/
251
252# must be linked after kernel/
253drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
254
255# suspend and hibernation support
256drivers-$(CONFIG_PM) += arch/x86/power/
257
258drivers-$(CONFIG_FB) += arch/x86/video/
259
260drivers-$(CONFIG_RAS) += arch/x86/ras/
261
262####
263# boot loader support. Several targets are kept for legacy purposes
264
265boot := arch/x86/boot
266
267BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
268
269PHONY += bzImage $(BOOT_TARGETS)
270
271# Default kernel to build
272all: bzImage
273
274# KBUILD_IMAGE specify target image being built
275KBUILD_IMAGE := $(boot)/bzImage
276
277bzImage: vmlinux
278ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
279	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
280endif
281	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
282	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
283	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
284
285$(BOOT_TARGETS): vmlinux
286	$(Q)$(MAKE) $(build)=$(boot) $@
287
288PHONY += install
289install:
290	$(Q)$(MAKE) $(build)=$(boot) $@
291
292PHONY += vdso_install
293vdso_install:
294	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
295
296archclean:
297	$(Q)rm -rf $(objtree)/arch/i386
298	$(Q)rm -rf $(objtree)/arch/x86_64
299	$(Q)$(MAKE) $(clean)=$(boot)
300	$(Q)$(MAKE) $(clean)=arch/x86/tools
301	$(Q)$(MAKE) $(clean)=arch/x86/purgatory
302
303define archhelp
304  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
305  echo  '  install      - Install kernel using'
306  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
307  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
308  echo  '                  install to $$(INSTALL_PATH) and run lilo'
309  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
310  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
311  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
312  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
313  echo  '                  bzdisk/fdimage*/isoimage also accept:'
314  echo  '                  FDARGS="..."  arguments for the booted kernel'
315  echo  '                  FDINITRD=file initrd for the booted kernel'
316endef
317