Linux 3.8-rc7
[cris-mirror.git] / arch / x86 / vdso / Makefile
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2 # Building vDSO images for x86.
5 VDSO64-$(CONFIG_X86_64) := y
6 VDSOX32-$(CONFIG_X86_X32_ABI) := y
7 VDSO32-$(CONFIG_X86_32) := y
8 VDSO32-$(CONFIG_COMPAT) := y
10 vdso-install-$(VDSO64-y) += vdso.so
11 vdso-install-$(VDSOX32-y) += vdsox32.so
12 vdso-install-$(VDSO32-y) += $(vdso32-images)
15 # files to link into the vdso
16 vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
18 vobjs-$(VDSOX32-y) += $(vobjx32s-compat)
20 # Filter out x32 objects.
21 vobj64s := $(filter-out $(vobjx32s-compat),$(vobjs-y))
23 # files to link into kernel
24 obj-$(VDSO64-y) += vma.o vdso.o
25 obj-$(VDSOX32-y) += vdsox32.o
26 obj-$(VDSO32-y) += vdso32.o vdso32-setup.o
28 vobjs := $(foreach F,$(vobj64s),$(obj)/$F)
30 $(obj)/vdso.o: $(obj)/vdso.so
32 targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
34 export CPPFLAGS_vdso.lds += -P -C
36 VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
37 -Wl,--no-undefined \
38 -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
40 $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
42 $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
43 $(call if_changed,vdso)
45 $(obj)/%.so: OBJCOPYFLAGS := -S
46 $(obj)/%.so: $(obj)/%.so.dbg FORCE
47 $(call if_changed,objcopy)
50 # Don't omit frame pointers for ease of userspace debugging, but do
51 # optimize sibling calls.
53 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
54 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
55 -fno-omit-frame-pointer -foptimize-sibling-calls
57 $(vobjs): KBUILD_CFLAGS += $(CFL)
60 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
62 CFLAGS_REMOVE_vdso-note.o = -pg
63 CFLAGS_REMOVE_vclock_gettime.o = -pg
64 CFLAGS_REMOVE_vgetcpu.o = -pg
65 CFLAGS_REMOVE_vvar.o = -pg
67 targets += vdso-syms.lds
68 obj-$(VDSO64-y) += vdso-syms.lds
71 # Match symbols in the DSO that look like VDSO*; produce a file of constants.
73 sed-vdsosym := -e 's/^00*/0/' \
74 -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
75 quiet_cmd_vdsosym = VDSOSYM $@
76 define cmd_vdsosym
77 $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
78 endef
80 $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
81 $(call if_changed,vdsosym)
84 # X32 processes use x32 vDSO to access 64bit kernel data.
86 # Build x32 vDSO image:
87 # 1. Compile x32 vDSO as 64bit.
88 # 2. Convert object files to x32.
89 # 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
90 # so that it can reach 64bit address space with 64bit pointers.
93 targets += vdsox32-syms.lds
94 obj-$(VDSOX32-y) += vdsox32-syms.lds
96 CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
97 VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \
98 -Wl,-soname=linux-vdso.so.1 \
99 -Wl,-z,max-page-size=4096 \
100 -Wl,-z,common-page-size=4096
102 vobjx32s-y := $(vobj64s:.o=-x32.o)
103 vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)
105 # Convert 64bit object file to x32 for x32 vDSO.
106 quiet_cmd_x32 = X32 $@
107 cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@
109 $(obj)/%-x32.o: $(obj)/%.o FORCE
110 $(call if_changed,x32)
112 targets += vdsox32.so vdsox32.so.dbg vdsox32.lds $(vobjx32s-y)
114 $(obj)/vdsox32.o: $(src)/vdsox32.S $(obj)/vdsox32.so
116 $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
117 $(call if_changed,vdso)
120 # Build multiple 32-bit vDSO images to choose from at boot time.
122 obj-$(VDSO32-y) += vdso32-syms.lds
123 vdso32.so-$(VDSO32-y) += int80
124 vdso32.so-$(CONFIG_COMPAT) += syscall
125 vdso32.so-$(VDSO32-y) += sysenter
127 vdso32-images = $(vdso32.so-y:%=vdso32-%.so)
129 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
130 VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-soname=linux-gate.so.1
132 # This makes sure the $(obj) subdirectory exists even though vdso32/
133 # is not a kbuild sub-make subdirectory.
134 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
136 targets += vdso32/vdso32.lds
137 targets += $(vdso32-images) $(vdso32-images:=.dbg)
138 targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o)
140 extra-y += $(vdso32-images)
142 $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%)
144 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
145 $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
146 $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32
148 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
149 $(obj)/vdso32/vdso32.lds \
150 $(obj)/vdso32/note.o \
151 $(obj)/vdso32/%.o
152 $(call if_changed,vdso)
154 # Make vdso32-*-syms.lds from each image, and then make sure they match.
155 # The only difference should be that some do not define VDSO32_SYSENTER_RETURN.
157 targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds)
159 quiet_cmd_vdso32sym = VDSOSYM $@
160 define cmd_vdso32sym
161 if LC_ALL=C sort -u $(filter-out FORCE,$^) > $(@D)/.tmp_$(@F) && \
162 $(foreach H,$(filter-out FORCE,$^),\
163 if grep -q VDSO32_SYSENTER_RETURN $H; \
164 then diff -u $(@D)/.tmp_$(@F) $H; \
165 else sed /VDSO32_SYSENTER_RETURN/d $(@D)/.tmp_$(@F) | \
166 diff -u - $H; fi &&) : ;\
167 then mv -f $(@D)/.tmp_$(@F) $@; \
168 else rm -f $(@D)/.tmp_$(@F); exit 1; \
170 endef
172 $(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE
173 $(call if_changed,vdso32sym)
176 # The DSO images are built using a special linker script.
178 quiet_cmd_vdso = VDSO $@
179 cmd_vdso = $(CC) -nostdlib -o $@ \
180 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
181 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
182 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
184 VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
185 GCOV_PROFILE := n
188 # Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
190 quiet_cmd_vdso_install = INSTALL $@
191 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
192 $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
193 @mkdir -p $(MODLIB)/vdso
194 $(call cmd,vdso_install)
196 PHONY += vdso_install $(vdso-install-y)
197 vdso_install: $(vdso-install-y)
199 clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80*