xref: /openbmc/linux/arch/x86/Makefile (revision 31b90347) 
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
19ifdef CONFIG_X86_NEED_RELOCS
20        LDFLAGS_vmlinux := --emit-relocs
21endif
22
23ifeq ($(CONFIG_X86_32),y)
24        BITS := 32
25        UTS_MACHINE := i386
26        CHECKFLAGS += -D__i386__
27
28        biarch := $(call cc-option,-m32)
29        KBUILD_AFLAGS += $(biarch)
30        KBUILD_CFLAGS += $(biarch)
31
32        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
33
34        # Don't autogenerate MMX or SSE instructions
35        KBUILD_CFLAGS += -mno-mmx -mno-sse
36
37        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
38        # with nonstandard options
39        KBUILD_CFLAGS += -fno-pic
40
41        # prevent gcc from keeping the stack 16 byte aligned
42        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
43
44        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
45        # a lot more stack due to the lack of sharing of stacklots:
46        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
47				$(call cc-option,-fno-unit-at-a-time))
48
49        # CPU-specific tuning. Anything which can be shared with UML should go here.
50        include $(srctree)/arch/x86/Makefile_32.cpu
51        KBUILD_CFLAGS += $(cflags-y)
52
53        # temporary until string.h is fixed
54        KBUILD_CFLAGS += -ffreestanding
55else
56        BITS := 64
57        UTS_MACHINE := x86_64
58        CHECKFLAGS += -D__x86_64__ -m64
59
60        KBUILD_AFLAGS += -m64
61        KBUILD_CFLAGS += -m64
62
63        # Don't autogenerate MMX or SSE instructions
64        KBUILD_CFLAGS += -mno-mmx -mno-sse
65
66	# Use -mpreferred-stack-boundary=3 if supported.
67	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
68
69        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
70        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
71        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
72
73        cflags-$(CONFIG_MCORE2) += \
74                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
75	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
76		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
77        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
78        KBUILD_CFLAGS += $(cflags-y)
79
80        KBUILD_CFLAGS += -mno-red-zone
81        KBUILD_CFLAGS += -mcmodel=kernel
82
83        # -funit-at-a-time shrinks the kernel .text considerably
84        # unfortunately it makes reading oopses harder.
85        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
86
87        # this works around some issues with generating unwind tables in older gccs
88        # newer gccs do it by default
89        KBUILD_CFLAGS += -maccumulate-outgoing-args
90endif
91
92ifdef CONFIG_CC_STACKPROTECTOR
93	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
94        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
95                stackp-y := -fstack-protector
96                KBUILD_CFLAGS += $(stackp-y)
97        else
98                $(warning stack protector enabled but no compiler support)
99        endif
100endif
101
102ifdef CONFIG_X86_X32
103	x32_ld_ok := $(call try-run,\
104			/bin/echo -e '1: .quad 1b' | \
105			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
106			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
107			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
108        ifeq ($(x32_ld_ok),y)
109                CONFIG_X86_X32_ABI := y
110                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
111                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
112        else
113                $(warning CONFIG_X86_X32 enabled but no binutils support)
114        endif
115endif
116export CONFIG_X86_X32_ABI
117
118# Don't unroll struct assignments with kmemcheck enabled
119ifeq ($(CONFIG_KMEMCHECK),y)
120	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
121endif
122
123# Stackpointer is addressed different for 32 bit and 64 bit x86
124sp-$(CONFIG_X86_32) := esp
125sp-$(CONFIG_X86_64) := rsp
126
127# do binutils support CFI?
128cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
129# is .cfi_signal_frame supported too?
130cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
131cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
132
133# does binutils support specific instructions?
134asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
135avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
136avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
137
138KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
139KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
140
141LDFLAGS := -m elf_$(UTS_MACHINE)
142
143# Speed up the build
144KBUILD_CFLAGS += -pipe
145# Workaround for a gcc prelease that unfortunately was shipped in a suse release
146KBUILD_CFLAGS += -Wno-sign-compare
147#
148KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
149# prevent gcc from generating any FP code by mistake
150KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
151KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
152
153KBUILD_CFLAGS += $(mflags-y)
154KBUILD_AFLAGS += $(mflags-y)
155
156archscripts: scripts_basic
157	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
158
159###
160# Syscall table generation
161
162archheaders:
163	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
164
165###
166# Kernel objects
167
168head-y := arch/x86/kernel/head_$(BITS).o
169head-y += arch/x86/kernel/head$(BITS).o
170head-y += arch/x86/kernel/head.o
171
172libs-y  += arch/x86/lib/
173
174# See arch/x86/Kbuild for content of core part of the kernel
175core-y += arch/x86/
176
177# drivers-y are linked after core-y
178drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
179drivers-$(CONFIG_PCI)            += arch/x86/pci/
180
181# must be linked after kernel/
182drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
183
184# suspend and hibernation support
185drivers-$(CONFIG_PM) += arch/x86/power/
186
187drivers-$(CONFIG_FB) += arch/x86/video/
188
189####
190# boot loader support. Several targets are kept for legacy purposes
191
192boot := arch/x86/boot
193
194BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
195
196PHONY += bzImage $(BOOT_TARGETS)
197
198# Default kernel to build
199all: bzImage
200
201# KBUILD_IMAGE specify target image being built
202KBUILD_IMAGE := $(boot)/bzImage
203
204bzImage: vmlinux
205ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
206	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
207endif
208	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
209	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
210	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
211
212$(BOOT_TARGETS): vmlinux
213	$(Q)$(MAKE) $(build)=$(boot) $@
214
215PHONY += install
216install:
217	$(Q)$(MAKE) $(build)=$(boot) $@
218
219PHONY += vdso_install
220vdso_install:
221	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
222
223archclean:
224	$(Q)rm -rf $(objtree)/arch/i386
225	$(Q)rm -rf $(objtree)/arch/x86_64
226	$(Q)$(MAKE) $(clean)=$(boot)
227	$(Q)$(MAKE) $(clean)=arch/x86/tools
228
229PHONY += kvmconfig
230kvmconfig:
231	$(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
232	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config arch/x86/configs/kvm_guest.config
233	$(Q)yes "" | $(MAKE) oldconfig
234
235define archhelp
236  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
237  echo  '  install      - Install kernel using'
238  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
239  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
240  echo  '                  install to $$(INSTALL_PATH) and run lilo'
241  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
242  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
243  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
244  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
245  echo  '                  bzdisk/fdimage*/isoimage also accept:'
246  echo  '                  FDARGS="..."  arguments for the booted kernel'
247  echo  '                  FDINITRD=file initrd for the booted kernel'
248  echo  '  kvmconfig	- Enable additional options for guest kernel support'
249endef
250