xref: /openbmc/linux/arch/x86/Makefile (revision 9f380456) 
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
85ifdef CONFIG_X86_X32
86	x32_ld_ok := $(call try-run,\
87			/bin/echo -e '1: .quad 1b' | \
88			$(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
89			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
90			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
91        ifeq ($(x32_ld_ok),y)
92                CONFIG_X86_X32_ABI := y
93                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
94                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
95        else
96                $(warning CONFIG_X86_X32 enabled but no binutils support)
97        endif
98endif
99export CONFIG_X86_X32_ABI
100
101# Don't unroll struct assignments with kmemcheck enabled
102ifeq ($(CONFIG_KMEMCHECK),y)
103	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
104endif
105
106# Stackpointer is addressed different for 32 bit and 64 bit x86
107sp-$(CONFIG_X86_32) := esp
108sp-$(CONFIG_X86_64) := rsp
109
110# do binutils support CFI?
111cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
112# is .cfi_signal_frame supported too?
113cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
114cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
115
116# does binutils support specific instructions?
117asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
118
119KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
120KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
121
122LDFLAGS := -m elf_$(UTS_MACHINE)
123
124# Speed up the build
125KBUILD_CFLAGS += -pipe
126# Workaround for a gcc prelease that unfortunately was shipped in a suse release
127KBUILD_CFLAGS += -Wno-sign-compare
128#
129KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
130# prevent gcc from generating any FP code by mistake
131KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
132KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
133
134KBUILD_CFLAGS += $(mflags-y)
135KBUILD_AFLAGS += $(mflags-y)
136
137###
138# Syscall table generation
139
140archheaders:
141	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
142
143###
144# Kernel objects
145
146head-y := arch/x86/kernel/head_$(BITS).o
147head-y += arch/x86/kernel/head$(BITS).o
148head-y += arch/x86/kernel/head.o
149head-y += arch/x86/kernel/init_task.o
150
151libs-y  += arch/x86/lib/
152
153# See arch/x86/Kbuild for content of core part of the kernel
154core-y += arch/x86/
155
156# drivers-y are linked after core-y
157drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
158drivers-$(CONFIG_PCI)            += arch/x86/pci/
159
160# must be linked after kernel/
161drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
162
163# suspend and hibernation support
164drivers-$(CONFIG_PM) += arch/x86/power/
165
166drivers-$(CONFIG_FB) += arch/x86/video/
167
168####
169# boot loader support. Several targets are kept for legacy purposes
170
171boot := arch/x86/boot
172
173BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
174
175PHONY += bzImage $(BOOT_TARGETS)
176
177# Default kernel to build
178all: bzImage
179
180# KBUILD_IMAGE specify target image being built
181KBUILD_IMAGE := $(boot)/bzImage
182
183bzImage: vmlinux
184ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
185	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
186endif
187	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
188	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
189	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
190
191$(BOOT_TARGETS): vmlinux
192	$(Q)$(MAKE) $(build)=$(boot) $@
193
194PHONY += install
195install:
196	$(Q)$(MAKE) $(build)=$(boot) $@
197
198PHONY += vdso_install
199vdso_install:
200	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
201
202archclean:
203	$(Q)rm -rf $(objtree)/arch/i386
204	$(Q)rm -rf $(objtree)/arch/x86_64
205	$(Q)$(MAKE) $(clean)=$(boot)
206
207define archhelp
208  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
209  echo  '  install      - Install kernel using'
210  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
211  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
212  echo  '                  install to $$(INSTALL_PATH) and run lilo'
213  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
214  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
215  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
216  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
217  echo  '                  bzdisk/fdimage*/isoimage also accept:'
218  echo  '                  FDARGS="..."  arguments for the booted kernel'
219  echo  '                  FDINITRD=file initrd for the booted kernel'
220endef
221