xref: /linux/arch/x86/Makefile (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1# Unified Makefile for i386 and x86_64
2
3# select defconfig based on actual architecture
4ifeq ($(ARCH),x86)
5        KBUILD_DEFCONFIG := i386_defconfig
6else
7        KBUILD_DEFCONFIG := $(ARCH)_defconfig
8endif
9
10# BITS is used as extension for files which are available in a 32 bit
11# and a 64 bit version to simplify shared Makefiles.
12# e.g.: obj-y += foo_$(BITS).o
13export BITS
14
15ifeq ($(CONFIG_X86_32),y)
16        BITS := 32
17        UTS_MACHINE := i386
18        CHECKFLAGS += -D__i386__
19
20        biarch := $(call cc-option,-m32)
21        KBUILD_AFLAGS += $(biarch)
22        KBUILD_CFLAGS += $(biarch)
23
24        ifdef CONFIG_RELOCATABLE
25                LDFLAGS_vmlinux := --emit-relocs
26        endif
27
28        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
29
30        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
31        # with nonstandard options
32        KBUILD_CFLAGS += -fno-pic
33
34        # prevent gcc from keeping the stack 16 byte aligned
35        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
36
37        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
38        # a lot more stack due to the lack of sharing of stacklots:
39        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
40				$(call cc-option,-fno-unit-at-a-time))
41
42        # CPU-specific tuning. Anything which can be shared with UML should go here.
43        include $(srctree)/arch/x86/Makefile_32.cpu
44        KBUILD_CFLAGS += $(cflags-y)
45
46        # temporary until string.h is fixed
47        KBUILD_CFLAGS += -ffreestanding
48else
49        BITS := 64
50        UTS_MACHINE := x86_64
51        CHECKFLAGS += -D__x86_64__ -m64
52
53        KBUILD_AFLAGS += -m64
54        KBUILD_CFLAGS += -m64
55
56	# Use -mpreferred-stack-boundary=3 if supported.
57	KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)
58
59        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
60        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
61        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
62
63        cflags-$(CONFIG_MCORE2) += \
64                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
65	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
66		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
67        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
68        KBUILD_CFLAGS += $(cflags-y)
69
70        KBUILD_CFLAGS += -mno-red-zone
71        KBUILD_CFLAGS += -mcmodel=kernel
72
73        # -funit-at-a-time shrinks the kernel .text considerably
74        # unfortunately it makes reading oopses harder.
75        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
76
77        # this works around some issues with generating unwind tables in older gccs
78        # newer gccs do it by default
79        KBUILD_CFLAGS += -maccumulate-outgoing-args
80endif
81
82ifdef CONFIG_CC_STACKPROTECTOR
83	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
84        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
85                stackp-y := -fstack-protector
86                KBUILD_CFLAGS += $(stackp-y)
87        else
88                $(warning stack protector enabled but no compiler support)
89        endif
90endif
91
92ifdef CONFIG_X86_X32
93	x32_ld_ok := $(call try-run,\
94			/bin/echo -e '1: .quad 1b' | \
95			$(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
96			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
97			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
98        ifeq ($(x32_ld_ok),y)
99                CONFIG_X86_X32_ABI := y
100                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
101                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
102        else
103                $(warning CONFIG_X86_X32 enabled but no binutils support)
104        endif
105endif
106export CONFIG_X86_X32_ABI
107
108# Don't unroll struct assignments with kmemcheck enabled
109ifeq ($(CONFIG_KMEMCHECK),y)
110	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
111endif
112
113# Stackpointer is addressed different for 32 bit and 64 bit x86
114sp-$(CONFIG_X86_32) := esp
115sp-$(CONFIG_X86_64) := rsp
116
117# do binutils support CFI?
118cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
119# is .cfi_signal_frame supported too?
120cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
121cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
122
123# does binutils support specific instructions?
124asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
125avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
126
127KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
128KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
129
130LDFLAGS := -m elf_$(UTS_MACHINE)
131
132# Speed up the build
133KBUILD_CFLAGS += -pipe
134# Workaround for a gcc prelease that unfortunately was shipped in a suse release
135KBUILD_CFLAGS += -Wno-sign-compare
136#
137KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
138# prevent gcc from generating any FP code by mistake
139KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
140KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
141
142KBUILD_CFLAGS += $(mflags-y)
143KBUILD_AFLAGS += $(mflags-y)
144
145archscripts: scripts_basic
146	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
147
148###
149# Syscall table generation
150
151archheaders:
152	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
153
154###
155# Kernel objects
156
157head-y := arch/x86/kernel/head_$(BITS).o
158head-y += arch/x86/kernel/head$(BITS).o
159head-y += arch/x86/kernel/head.o
160
161libs-y  += arch/x86/lib/
162
163# See arch/x86/Kbuild for content of core part of the kernel
164core-y += arch/x86/
165
166# drivers-y are linked after core-y
167drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
168drivers-$(CONFIG_PCI)            += arch/x86/pci/
169
170# must be linked after kernel/
171drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
172
173# suspend and hibernation support
174drivers-$(CONFIG_PM) += arch/x86/power/
175
176drivers-$(CONFIG_FB) += arch/x86/video/
177
178####
179# boot loader support. Several targets are kept for legacy purposes
180
181boot := arch/x86/boot
182
183BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
184
185PHONY += bzImage $(BOOT_TARGETS)
186
187# Default kernel to build
188all: bzImage
189
190# KBUILD_IMAGE specify target image being built
191KBUILD_IMAGE := $(boot)/bzImage
192
193bzImage: vmlinux
194ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
195	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
196endif
197	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
198	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
199	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
200
201$(BOOT_TARGETS): vmlinux
202	$(Q)$(MAKE) $(build)=$(boot) $@
203
204PHONY += install
205install:
206	$(Q)$(MAKE) $(build)=$(boot) $@
207
208PHONY += vdso_install
209vdso_install:
210	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
211
212archclean:
213	$(Q)rm -rf $(objtree)/arch/i386
214	$(Q)rm -rf $(objtree)/arch/x86_64
215	$(Q)$(MAKE) $(clean)=$(boot)
216	$(Q)$(MAKE) $(clean)=arch/x86/tools
217
218define archhelp
219  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
220  echo  '  install      - Install kernel using'
221  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
222  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
223  echo  '                  install to $$(INSTALL_PATH) and run lilo'
224  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
225  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
226  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
227  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
228  echo  '                  bzdisk/fdimage*/isoimage also accept:'
229  echo  '                  FDARGS="..."  arguments for the booted kernel'
230  echo  '                  FDINITRD=file initrd for the booted kernel'
231endef
232