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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 += $(call cc-ifversion, -lt, 0400, \
36				$(call cc-option,-fno-unit-at-a-time))
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_MATOM) += $(call cc-option,-march=atom) \
59		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
60        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
61        KBUILD_CFLAGS += $(cflags-y)
62
63        KBUILD_CFLAGS += -mno-red-zone
64        KBUILD_CFLAGS += -mcmodel=kernel
65
66        # -funit-at-a-time shrinks the kernel .text considerably
67        # unfortunately it makes reading oopses harder.
68        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
69
70        # this works around some issues with generating unwind tables in older gccs
71        # newer gccs do it by default
72        KBUILD_CFLAGS += -maccumulate-outgoing-args
73endif
74
75KBUILD_CFLAGS += -fno-pic
76
77ifdef CONFIG_CC_STACKPROTECTOR
78	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
79        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
80                stackp-y := -fstack-protector
81                KBUILD_CFLAGS += $(stackp-y)
82        else
83                $(warning stack protector enabled but no compiler support)
84        endif
85endif
86
87ifdef CONFIG_X86_X32
88	x32_ld_ok := $(call try-run,\
89			/bin/echo -e '1: .quad 1b' | \
90			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
91			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
92			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
93        ifeq ($(x32_ld_ok),y)
94                CONFIG_X86_X32_ABI := y
95                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
96                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
97        else
98                $(warning CONFIG_X86_X32 enabled but no binutils support)
99        endif
100endif
101export CONFIG_X86_X32_ABI
102
103# Don't unroll struct assignments with kmemcheck enabled
104ifeq ($(CONFIG_KMEMCHECK),y)
105	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
106endif
107
108# Stackpointer is addressed different for 32 bit and 64 bit x86
109sp-$(CONFIG_X86_32) := esp
110sp-$(CONFIG_X86_64) := rsp
111
112# do binutils support CFI?
113cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
114# is .cfi_signal_frame supported too?
115cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
116cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
117
118# does binutils support specific instructions?
119asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
120
121KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
122KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
123
124LDFLAGS := -m elf_$(UTS_MACHINE)
125
126# Speed up the build
127KBUILD_CFLAGS += -pipe
128# Workaround for a gcc prelease that unfortunately was shipped in a suse release
129KBUILD_CFLAGS += -Wno-sign-compare
130#
131KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
132# prevent gcc from generating any FP code by mistake
133KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
134KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
135
136###
137# Sub architecture support
138# fcore-y is linked before mcore-y files.
139
140# Default subarch .c files
141mcore-y  := arch/x86/mach-default/
142
143# Voyager subarch support
144mflags-$(CONFIG_X86_VOYAGER)	:= -Iarch/x86/include/asm/mach-voyager
145mcore-$(CONFIG_X86_VOYAGER)	:= arch/x86/mach-voyager/
146
147# generic subarchitecture
148mflags-$(CONFIG_X86_GENERICARCH):= -Iarch/x86/include/asm/mach-generic
149fcore-$(CONFIG_X86_GENERICARCH)	+= arch/x86/mach-generic/
150mcore-$(CONFIG_X86_GENERICARCH)	:= arch/x86/mach-default/
151
152# Goldfish virtual platform support
153mflags-$(CONFIG_X86_GOLDFISH):= -Iarch/x86/include/asm/mach-goldfish
154fcore-$(CONFIG_X86_GOLDFISH)	+= arch/x86/mach-goldfish/
155mcore-$(CONFIG_X86_GOLDFISH)	:= arch/x86/mach-default/
156
157# default subarch .h files
158mflags-y += -Iarch/x86/include/asm/mach-default
159
160# 64 bit does not support subarch support - clear sub arch variables
161fcore-$(CONFIG_X86_64)  :=
162mcore-$(CONFIG_X86_64)  :=
163
164KBUILD_CFLAGS += $(mflags-y)
165KBUILD_AFLAGS += $(mflags-y)
166
167archscripts:
168	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
169
170###
171# Syscall table generation
172
173archheaders:
174	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
175
176###
177# Kernel objects
178
179head-y := arch/x86/kernel/head_$(BITS).o
180head-y += arch/x86/kernel/head$(BITS).o
181head-y += arch/x86/kernel/head.o
182head-y += arch/x86/kernel/init_task.o
183
184libs-y  += arch/x86/lib/
185
186# See arch/x86/Kbuild for content of core part of the kernel
187core-y += arch/x86/
188
189# drivers-y are linked after core-y
190drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
191drivers-$(CONFIG_PCI)            += arch/x86/pci/
192
193# must be linked after kernel/
194drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
195
196# suspend and hibernation support
197drivers-$(CONFIG_PM) += arch/x86/power/
198
199drivers-$(CONFIG_FB) += arch/x86/video/
200
201####
202# boot loader support. Several targets are kept for legacy purposes
203
204boot := arch/x86/boot
205
206BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
207
208PHONY += bzImage $(BOOT_TARGETS)
209
210# Default kernel to build
211all: bzImage
212
213# KBUILD_IMAGE specify target image being built
214KBUILD_IMAGE := $(boot)/bzImage
215
216bzImage: vmlinux
217ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
218	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
219endif
220	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
221	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
222	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
223
224$(BOOT_TARGETS): vmlinux
225	$(Q)$(MAKE) $(build)=$(boot) $@
226
227PHONY += install
228install:
229	$(Q)$(MAKE) $(build)=$(boot) $@
230
231PHONY += vdso_install
232vdso_install:
233	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
234
235archclean:
236	$(Q)rm -rf $(objtree)/arch/i386
237	$(Q)rm -rf $(objtree)/arch/x86_64
238	$(Q)$(MAKE) $(clean)=$(boot)
239	$(Q)$(MAKE) $(clean)=arch/x86/tools
240
241define archhelp
242  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
243  echo  '  install      - Install kernel using'
244  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
245  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
246  echo  '                  install to $$(INSTALL_PATH) and run lilo'
247  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
248  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
249  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
250  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
251  echo  '                  bzdisk/fdimage*/isoimage also accept:'
252  echo  '                  FDARGS="..."  arguments for the booted kernel'
253  echo  '                  FDINITRD=file initrd for the booted kernel'
254endef
255