Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / arch / x86 / vdso / Makefile
1 #
2 # Building vDSO images for x86.
3 #
4
5 VDSO64-$(CONFIG_X86_64)         := y
6 VDSO32-$(CONFIG_X86_32)         := y
7 VDSO32-$(CONFIG_COMPAT)         := y
8
9 vdso-install-$(VDSO64-y)        += vdso.so
10 vdso-install-$(VDSO32-y)        += $(vdso32-images)
11
12
13 # files to link into the vdso
14 vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
15
16 # files to link into kernel
17 obj-$(VDSO64-y)                 += vma.o vdso.o
18 obj-$(VDSO32-y)                 += vdso32.o vdso32-setup.o
19
20 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
21
22 $(obj)/vdso.o: $(obj)/vdso.so
23
24 targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
25
26 export CPPFLAGS_vdso.lds += -P -C
27
28 VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 -Wl,-soname=linux-vdso.so.1 \
29                         -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
30
31 $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
32
33 $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
34         $(call if_changed,vdso)
35
36 $(obj)/%.so: OBJCOPYFLAGS := -S
37 $(obj)/%.so: $(obj)/%.so.dbg FORCE
38         $(call if_changed,objcopy)
39
40 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
41        $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector)
42
43 $(vobjs): KBUILD_CFLAGS += $(CFL)
44
45 targets += vdso-syms.lds
46 obj-$(VDSO64-y)                 += vdso-syms.lds
47
48 #
49 # Match symbols in the DSO that look like VDSO*; produce a file of constants.
50 #
51 sed-vdsosym := -e 's/^00*/0/' \
52         -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p'
53 quiet_cmd_vdsosym = VDSOSYM $@
54 define cmd_vdsosym
55         $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@
56 endef
57
58 $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
59         $(call if_changed,vdsosym)
60
61 #
62 # Build multiple 32-bit vDSO images to choose from at boot time.
63 #
64 obj-$(VDSO32-y)                 += vdso32-syms.lds
65 vdso32.so-$(VDSO32-y)           += int80
66 vdso32.so-$(CONFIG_COMPAT)      += syscall
67 vdso32.so-$(VDSO32-y)           += sysenter
68
69 vdso32-images                   = $(vdso32.so-y:%=vdso32-%.so)
70
71 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
72 VDSO_LDFLAGS_vdso32.lds = -m elf_i386 -Wl,-soname=linux-gate.so.1
73
74 # This makes sure the $(obj) subdirectory exists even though vdso32/
75 # is not a kbuild sub-make subdirectory.
76 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
77
78 targets += vdso32/vdso32.lds
79 targets += $(vdso32-images) $(vdso32-images:=.dbg)
80 targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o)
81
82 extra-y += $(vdso32-images)
83
84 $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%)
85
86 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
87 $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
88 $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32
89
90 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
91                                  $(obj)/vdso32/vdso32.lds \
92                                  $(obj)/vdso32/note.o \
93                                  $(obj)/vdso32/%.o
94         $(call if_changed,vdso)
95
96 # Make vdso32-*-syms.lds from each image, and then make sure they match.
97 # The only difference should be that some do not define VDSO32_SYSENTER_RETURN.
98
99 targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds)
100
101 quiet_cmd_vdso32sym = VDSOSYM $@
102 define cmd_vdso32sym
103         if LC_ALL=C sort -u $(filter-out FORCE,$^) > $(@D)/.tmp_$(@F) && \
104            $(foreach H,$(filter-out FORCE,$^),\
105                      if grep -q VDSO32_SYSENTER_RETURN $H; \
106                      then diff -u $(@D)/.tmp_$(@F) $H; \
107                      else sed /VDSO32_SYSENTER_RETURN/d $(@D)/.tmp_$(@F) | \
108                           diff -u - $H; fi &&) : ;\
109         then mv -f $(@D)/.tmp_$(@F) $@; \
110         else rm -f $(@D)/.tmp_$(@F); exit 1; \
111         fi
112 endef
113
114 $(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE
115         $(call if_changed,vdso32sym)
116
117 #
118 # The DSO images are built using a special linker script.
119 #
120 quiet_cmd_vdso = VDSO    $@
121       cmd_vdso = $(CC) -nostdlib -o $@ \
122                        $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
123                        -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
124                  sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
125
126 VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
127 GCOV_PROFILE := n
128
129 #
130 # Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
131 #
132 quiet_cmd_vdso_install = INSTALL $@
133       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
134 $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
135         @mkdir -p $(MODLIB)/vdso
136         $(call cmd,vdso_install)
137
138 PHONY += vdso_install $(vdso-install-y)
139 vdso_install: $(vdso-install-y)
140
141 clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80*