xref: /openbmc/linux/arch/x86/Makefile (revision 8e9356c6) 
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        KBUILD_AFLAGS += -m64
83        KBUILD_CFLAGS += -m64
84
85        # Don't autogenerate MMX or SSE instructions
86        KBUILD_CFLAGS += -mno-mmx -mno-sse
87
88	# Use -mpreferred-stack-boundary=3 if supported.
89	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
90
91        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
92        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
93        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
94
95        cflags-$(CONFIG_MCORE2) += \
96                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
97	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
98		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
99        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
100        KBUILD_CFLAGS += $(cflags-y)
101
102        KBUILD_CFLAGS += -mno-red-zone
103        KBUILD_CFLAGS += -mcmodel=kernel
104
105        # -funit-at-a-time shrinks the kernel .text considerably
106        # unfortunately it makes reading oopses harder.
107        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
108
109        # this works around some issues with generating unwind tables in older gccs
110        # newer gccs do it by default
111        KBUILD_CFLAGS += -maccumulate-outgoing-args
112endif
113
114# Make sure compiler does not have buggy stack-protector support.
115ifdef CONFIG_CC_STACKPROTECTOR
116	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
117        ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
118                $(warning stack-protector enabled but compiler support broken)
119        endif
120endif
121
122ifdef CONFIG_X86_X32
123	x32_ld_ok := $(call try-run,\
124			/bin/echo -e '1: .quad 1b' | \
125			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
126			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
127			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
128        ifeq ($(x32_ld_ok),y)
129                CONFIG_X86_X32_ABI := y
130                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
131                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
132        else
133                $(warning CONFIG_X86_X32 enabled but no binutils support)
134        endif
135endif
136export CONFIG_X86_X32_ABI
137
138# Don't unroll struct assignments with kmemcheck enabled
139ifeq ($(CONFIG_KMEMCHECK),y)
140	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
141endif
142
143# Stackpointer is addressed different for 32 bit and 64 bit x86
144sp-$(CONFIG_X86_32) := esp
145sp-$(CONFIG_X86_64) := rsp
146
147# do binutils support CFI?
148cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
149# is .cfi_signal_frame supported too?
150cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
151cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
152
153# does binutils support specific instructions?
154asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
155avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
156avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
157
158KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
159KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
160
161LDFLAGS := -m elf_$(UTS_MACHINE)
162
163# Speed up the build
164KBUILD_CFLAGS += -pipe
165# Workaround for a gcc prelease that unfortunately was shipped in a suse release
166KBUILD_CFLAGS += -Wno-sign-compare
167#
168KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
169# prevent gcc from generating any FP code by mistake
170KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
171KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
172
173KBUILD_CFLAGS += $(mflags-y)
174KBUILD_AFLAGS += $(mflags-y)
175
176archscripts: scripts_basic
177	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
178
179###
180# Syscall table generation
181
182archheaders:
183	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
184
185###
186# Kernel objects
187
188head-y := arch/x86/kernel/head_$(BITS).o
189head-y += arch/x86/kernel/head$(BITS).o
190head-y += arch/x86/kernel/head.o
191
192libs-y  += arch/x86/lib/
193
194# See arch/x86/Kbuild for content of core part of the kernel
195core-y += arch/x86/
196
197# drivers-y are linked after core-y
198drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
199drivers-$(CONFIG_PCI)            += arch/x86/pci/
200
201# must be linked after kernel/
202drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
203
204# suspend and hibernation support
205drivers-$(CONFIG_PM) += arch/x86/power/
206
207drivers-$(CONFIG_FB) += arch/x86/video/
208
209####
210# boot loader support. Several targets are kept for legacy purposes
211
212boot := arch/x86/boot
213
214BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
215
216PHONY += bzImage $(BOOT_TARGETS)
217
218# Default kernel to build
219all: bzImage
220
221# KBUILD_IMAGE specify target image being built
222KBUILD_IMAGE := $(boot)/bzImage
223
224bzImage: vmlinux
225ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
226	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
227endif
228	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
229	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
230	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
231
232$(BOOT_TARGETS): vmlinux
233	$(Q)$(MAKE) $(build)=$(boot) $@
234
235PHONY += install
236install:
237	$(Q)$(MAKE) $(build)=$(boot) $@
238
239PHONY += vdso_install
240vdso_install:
241	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
242
243archclean:
244	$(Q)rm -rf $(objtree)/arch/i386
245	$(Q)rm -rf $(objtree)/arch/x86_64
246	$(Q)$(MAKE) $(clean)=$(boot)
247	$(Q)$(MAKE) $(clean)=arch/x86/tools
248
249PHONY += kvmconfig
250kvmconfig:
251	$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
252	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config arch/x86/configs/kvm_guest.config
253	$(Q)yes "" | $(MAKE) oldconfig
254
255define archhelp
256  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
257  echo  '  install      - Install kernel using'
258  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
259  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
260  echo  '                  install to $$(INSTALL_PATH) and run lilo'
261  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
262  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
263  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
264  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
265  echo  '                  bzdisk/fdimage*/isoimage also accept:'
266  echo  '                  FDARGS="..."  arguments for the booted kernel'
267  echo  '                  FDINITRD=file initrd for the booted kernel'
268  echo  '  kvmconfig	- Enable additional options for guest kernel support'
269endef
270