xref: /linux/arch/x86/Makefile (revision 5bdef865eb358b6f3760e25e591ae115e9eeddef) 
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        # prevent gcc from keeping the stack 16 byte aligned
31        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
32
33        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
34        # a lot more stack due to the lack of sharing of stacklots:
35        KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
36                echo $(call cc-option,-fno-unit-at-a-time); fi ;)
37
38        # CPU-specific tuning. Anything which can be shared with UML should go here.
39        include $(srctree)/arch/x86/Makefile_32.cpu
40        KBUILD_CFLAGS += $(cflags-y)
41
42        # temporary until string.h is fixed
43        KBUILD_CFLAGS += -ffreestanding
44else
45        BITS := 64
46        UTS_MACHINE := x86_64
47        CHECKFLAGS += -D__x86_64__ -m64
48
49        KBUILD_AFLAGS += -m64
50        KBUILD_CFLAGS += -m64
51
52        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
53        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
54        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
55
56        cflags-$(CONFIG_MCORE2) += \
57                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
58        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
59        KBUILD_CFLAGS += $(cflags-y)
60
61        KBUILD_CFLAGS += -mno-red-zone
62        KBUILD_CFLAGS += -mcmodel=kernel
63
64        # -funit-at-a-time shrinks the kernel .text considerably
65        # unfortunately it makes reading oopses harder.
66        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
67
68        # this works around some issues with generating unwind tables in older gccs
69        # newer gccs do it by default
70        KBUILD_CFLAGS += -maccumulate-outgoing-args
71endif
72
73ifdef CONFIG_CC_STACKPROTECTOR
74	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
75        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y)
76                stackp-y := -fstack-protector
77                stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all
78                KBUILD_CFLAGS += $(stackp-y)
79        else
80                $(warning stack protector enabled but no compiler support)
81        endif
82endif
83
84# Don't unroll struct assignments with kmemcheck enabled
85ifeq ($(CONFIG_KMEMCHECK),y)
86	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
87endif
88
89# Stackpointer is addressed different for 32 bit and 64 bit x86
90sp-$(CONFIG_X86_32) := esp
91sp-$(CONFIG_X86_64) := rsp
92
93# do binutils support CFI?
94cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
95# is .cfi_signal_frame supported too?
96cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
97KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
98KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
99
100LDFLAGS := -m elf_$(UTS_MACHINE)
101
102# Speed up the build
103KBUILD_CFLAGS += -pipe
104# Workaround for a gcc prelease that unfortunately was shipped in a suse release
105KBUILD_CFLAGS += -Wno-sign-compare
106#
107KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
108# prevent gcc from generating any FP code by mistake
109KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
110
111KBUILD_CFLAGS += $(mflags-y)
112KBUILD_AFLAGS += $(mflags-y)
113
114###
115# Kernel objects
116
117head-y := arch/x86/kernel/head_$(BITS).o
118head-y += arch/x86/kernel/head$(BITS).o
119head-y += arch/x86/kernel/head.o
120head-y += arch/x86/kernel/init_task.o
121
122libs-y  += arch/x86/lib/
123
124# See arch/x86/Kbuild for content of core part of the kernel
125core-y += arch/x86/
126
127# drivers-y are linked after core-y
128drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
129drivers-$(CONFIG_PCI)            += arch/x86/pci/
130
131# must be linked after kernel/
132drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
133
134# suspend and hibernation support
135drivers-$(CONFIG_PM) += arch/x86/power/
136
137ifeq ($(CONFIG_X86_32),y)
138drivers-$(CONFIG_FB) += arch/x86/video/
139endif
140
141####
142# boot loader support. Several targets are kept for legacy purposes
143
144boot := arch/x86/boot
145
146BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
147
148PHONY += bzImage $(BOOT_TARGETS)
149
150# Default kernel to build
151all: bzImage
152
153# KBUILD_IMAGE specify target image being built
154KBUILD_IMAGE := $(boot)/bzImage
155
156bzImage: vmlinux
157	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
158	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
159	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
160
161$(BOOT_TARGETS): vmlinux
162	$(Q)$(MAKE) $(build)=$(boot) $@
163
164PHONY += install
165install:
166	$(Q)$(MAKE) $(build)=$(boot) $@
167
168PHONY += vdso_install
169vdso_install:
170	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
171
172archclean:
173	$(Q)rm -rf $(objtree)/arch/i386
174	$(Q)rm -rf $(objtree)/arch/x86_64
175	$(Q)$(MAKE) $(clean)=$(boot)
176
177define archhelp
178  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
179  echo  '  install      - Install kernel using'
180  echo  '                  (your) ~/bin/installkernel or'
181  echo  '                  (distribution) /sbin/installkernel or'
182  echo  '                  install to $$(INSTALL_PATH) and run lilo'
183  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
184  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
185  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
186  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
187  echo  '                  bzdisk/fdimage*/isoimage also accept:'
188  echo  '                  FDARGS="..."  arguments for the booted kernel'
189  echo  '                  FDINITRD=file initrd for the booted kernel'
190endef
191