xref: /openbmc/linux/arch/x86/Makefile (revision baa7eb025ab14f3cba2e35c0a8648f9c9f01d24f) 
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
75ifdef CONFIG_CC_STACKPROTECTOR
76	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
77        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
78                stackp-y := -fstack-protector
79                KBUILD_CFLAGS += $(stackp-y)
80        else
81                $(warning stack protector enabled but no compiler support)
82        endif
83endif
84
85# Don't unroll struct assignments with kmemcheck enabled
86ifeq ($(CONFIG_KMEMCHECK),y)
87	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
88endif
89
90# Stackpointer is addressed different for 32 bit and 64 bit x86
91sp-$(CONFIG_X86_32) := esp
92sp-$(CONFIG_X86_64) := rsp
93
94# do binutils support CFI?
95cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
96# is .cfi_signal_frame supported too?
97cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
98cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
99
100# does binutils support specific instructions?
101asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
102
103KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
104KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
105
106LDFLAGS := -m elf_$(UTS_MACHINE)
107
108# Speed up the build
109KBUILD_CFLAGS += -pipe
110# Workaround for a gcc prelease that unfortunately was shipped in a suse release
111KBUILD_CFLAGS += -Wno-sign-compare
112#
113KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
114# prevent gcc from generating any FP code by mistake
115KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
116
117KBUILD_CFLAGS += $(mflags-y)
118KBUILD_AFLAGS += $(mflags-y)
119
120###
121# Kernel objects
122
123head-y := arch/x86/kernel/head_$(BITS).o
124head-y += arch/x86/kernel/head$(BITS).o
125head-y += arch/x86/kernel/head.o
126head-y += arch/x86/kernel/init_task.o
127
128libs-y  += arch/x86/lib/
129
130# See arch/x86/Kbuild for content of core part of the kernel
131core-y += arch/x86/
132
133# drivers-y are linked after core-y
134drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
135drivers-$(CONFIG_PCI)            += arch/x86/pci/
136
137# must be linked after kernel/
138drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
139
140# suspend and hibernation support
141drivers-$(CONFIG_PM) += arch/x86/power/
142
143drivers-$(CONFIG_FB) += arch/x86/video/
144
145####
146# boot loader support. Several targets are kept for legacy purposes
147
148boot := arch/x86/boot
149
150BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
151
152PHONY += bzImage $(BOOT_TARGETS)
153
154# Default kernel to build
155all: bzImage
156
157# KBUILD_IMAGE specify target image being built
158KBUILD_IMAGE := $(boot)/bzImage
159
160bzImage: vmlinux
161ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
162	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
163endif
164	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
165	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
166	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
167
168$(BOOT_TARGETS): vmlinux
169	$(Q)$(MAKE) $(build)=$(boot) $@
170
171PHONY += install
172install:
173	$(Q)$(MAKE) $(build)=$(boot) $@
174
175PHONY += vdso_install
176vdso_install:
177	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
178
179archclean:
180	$(Q)rm -rf $(objtree)/arch/i386
181	$(Q)rm -rf $(objtree)/arch/x86_64
182	$(Q)$(MAKE) $(clean)=$(boot)
183
184define archhelp
185  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
186  echo  '  install      - Install kernel using'
187  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
188  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
189  echo  '                  install to $$(INSTALL_PATH) and run lilo'
190  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
191  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
192  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
193  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
194  echo  '                  bzdisk/fdimage*/isoimage also accept:'
195  echo  '                  FDARGS="..."  arguments for the booted kernel'
196  echo  '                  FDINITRD=file initrd for the booted kernel'
197endef
198