xref: /openbmc/linux/arch/x86/Makefile (revision 078a55fc) 
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 := $(ARCH)_defconfig
12endif
13
14# BITS is used as extension for files which are available in a 32 bit
15# and a 64 bit version to simplify shared Makefiles.
16# e.g.: obj-y += foo_$(BITS).o
17export BITS
18
19ifeq ($(CONFIG_X86_32),y)
20        BITS := 32
21        UTS_MACHINE := i386
22        CHECKFLAGS += -D__i386__
23
24        biarch := $(call cc-option,-m32)
25        KBUILD_AFLAGS += $(biarch)
26        KBUILD_CFLAGS += $(biarch)
27
28        ifdef CONFIG_RELOCATABLE
29                LDFLAGS_vmlinux := --emit-relocs
30        endif
31
32        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
33
34        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
35        # with nonstandard options
36        KBUILD_CFLAGS += -fno-pic
37
38        # prevent gcc from keeping the stack 16 byte aligned
39        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
40
41        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
42        # a lot more stack due to the lack of sharing of stacklots:
43        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
44				$(call cc-option,-fno-unit-at-a-time))
45
46        # CPU-specific tuning. Anything which can be shared with UML should go here.
47        include $(srctree)/arch/x86/Makefile_32.cpu
48        KBUILD_CFLAGS += $(cflags-y)
49
50        # temporary until string.h is fixed
51        KBUILD_CFLAGS += -ffreestanding
52else
53        BITS := 64
54        UTS_MACHINE := x86_64
55        CHECKFLAGS += -D__x86_64__ -m64
56
57        KBUILD_AFLAGS += -m64
58        KBUILD_CFLAGS += -m64
59
60	# Use -mpreferred-stack-boundary=3 if supported.
61	KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)
62
63        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
64        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
65        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
66
67        cflags-$(CONFIG_MCORE2) += \
68                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
69	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
70		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
71        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
72        KBUILD_CFLAGS += $(cflags-y)
73
74        KBUILD_CFLAGS += -mno-red-zone
75        KBUILD_CFLAGS += -mcmodel=kernel
76
77        # -funit-at-a-time shrinks the kernel .text considerably
78        # unfortunately it makes reading oopses harder.
79        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
80
81        # this works around some issues with generating unwind tables in older gccs
82        # newer gccs do it by default
83        KBUILD_CFLAGS += -maccumulate-outgoing-args
84endif
85
86ifdef CONFIG_CC_STACKPROTECTOR
87	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
88        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
89                stackp-y := -fstack-protector
90                KBUILD_CFLAGS += $(stackp-y)
91        else
92                $(warning stack protector enabled but no compiler support)
93        endif
94endif
95
96ifdef CONFIG_X86_X32
97	x32_ld_ok := $(call try-run,\
98			/bin/echo -e '1: .quad 1b' | \
99			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
100			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
101			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
102        ifeq ($(x32_ld_ok),y)
103                CONFIG_X86_X32_ABI := y
104                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
105                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
106        else
107                $(warning CONFIG_X86_X32 enabled but no binutils support)
108        endif
109endif
110export CONFIG_X86_X32_ABI
111
112# Don't unroll struct assignments with kmemcheck enabled
113ifeq ($(CONFIG_KMEMCHECK),y)
114	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
115endif
116
117# Stackpointer is addressed different for 32 bit and 64 bit x86
118sp-$(CONFIG_X86_32) := esp
119sp-$(CONFIG_X86_64) := rsp
120
121# do binutils support CFI?
122cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
123# is .cfi_signal_frame supported too?
124cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
125cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
126
127# does binutils support specific instructions?
128asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
129avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
130avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
131
132KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
133KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
134
135LDFLAGS := -m elf_$(UTS_MACHINE)
136
137# Speed up the build
138KBUILD_CFLAGS += -pipe
139# Workaround for a gcc prelease that unfortunately was shipped in a suse release
140KBUILD_CFLAGS += -Wno-sign-compare
141#
142KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
143# prevent gcc from generating any FP code by mistake
144KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
145KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
146
147KBUILD_CFLAGS += $(mflags-y)
148KBUILD_AFLAGS += $(mflags-y)
149
150archscripts: scripts_basic
151	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
152
153###
154# Syscall table generation
155
156archheaders:
157	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
158
159###
160# Kernel objects
161
162head-y := arch/x86/kernel/head_$(BITS).o
163head-y += arch/x86/kernel/head$(BITS).o
164head-y += arch/x86/kernel/head.o
165
166libs-y  += arch/x86/lib/
167
168# See arch/x86/Kbuild for content of core part of the kernel
169core-y += arch/x86/
170
171# drivers-y are linked after core-y
172drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
173drivers-$(CONFIG_PCI)            += arch/x86/pci/
174
175# must be linked after kernel/
176drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
177
178# suspend and hibernation support
179drivers-$(CONFIG_PM) += arch/x86/power/
180
181drivers-$(CONFIG_FB) += arch/x86/video/
182
183####
184# boot loader support. Several targets are kept for legacy purposes
185
186boot := arch/x86/boot
187
188BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
189
190PHONY += bzImage $(BOOT_TARGETS)
191
192# Default kernel to build
193all: bzImage
194
195# KBUILD_IMAGE specify target image being built
196KBUILD_IMAGE := $(boot)/bzImage
197
198bzImage: vmlinux
199ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
200	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
201endif
202	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
203	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
204	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
205
206$(BOOT_TARGETS): vmlinux
207	$(Q)$(MAKE) $(build)=$(boot) $@
208
209PHONY += install
210install:
211	$(Q)$(MAKE) $(build)=$(boot) $@
212
213PHONY += vdso_install
214vdso_install:
215	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
216
217archclean:
218	$(Q)rm -rf $(objtree)/arch/i386
219	$(Q)rm -rf $(objtree)/arch/x86_64
220	$(Q)$(MAKE) $(clean)=$(boot)
221	$(Q)$(MAKE) $(clean)=arch/x86/tools
222
223PHONY += kvmconfig
224kvmconfig:
225	$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
226	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config arch/x86/configs/kvm_guest.config
227	$(Q)yes "" | $(MAKE) oldconfig
228
229define archhelp
230  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
231  echo  '  install      - Install kernel using'
232  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
233  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
234  echo  '                  install to $$(INSTALL_PATH) and run lilo'
235  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
236  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
237  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
238  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
239  echo  '                  bzdisk/fdimage*/isoimage also accept:'
240  echo  '                  FDARGS="..."  arguments for the booted kernel'
241  echo  '                  FDINITRD=file initrd for the booted kernel'
242  echo  '  kvmconfig	- Enable additional options for guest kernel support'
243endef
244