Commit | Line | Data |
---|---|---|
2aae950b | 1 | # |
0249c9c1 | 2 | # Building vDSO images for x86. |
2aae950b AK |
3 | # |
4 | ||
0249c9c1 RM |
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 | |
2c158269 | 10 | vdso-install-$(VDSO32-y) += $(vdso32-images) |
0249c9c1 RM |
11 | |
12 | ||
2aae950b | 13 | # files to link into the vdso |
7f3646aa | 14 | vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o vvar.o |
2aae950b AK |
15 | |
16 | # files to link into kernel | |
6c3652ef | 17 | obj-$(VDSO64-y) += vma.o vdso.o |
af65d648 | 18 | obj-$(VDSO32-y) += vdso32.o vdso32-setup.o |
2aae950b AK |
19 | |
20 | vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) | |
21 | ||
22 | $(obj)/vdso.o: $(obj)/vdso.so | |
23 | ||
2b9c97e1 | 24 | targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) |
2aae950b | 25 | |
d746d647 | 26 | export CPPFLAGS_vdso.lds += -P -C |
2aae950b | 27 | |
16e48e7e RM |
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 | |
2aae950b AK |
30 | |
31 | $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so | |
32 | ||
f79eb83b | 33 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE |
16e48e7e | 34 | $(call if_changed,vdso) |
2aae950b | 35 | |
f79eb83b RM |
36 | $(obj)/%.so: OBJCOPYFLAGS := -S |
37 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
38 | $(call if_changed,objcopy) | |
39 | ||
8705a49c | 40 | CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
d627ded5 | 41 | $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) |
2aae950b | 42 | |
f6bc4029 | 43 | $(vobjs): KBUILD_CFLAGS += $(CFL) |
2aae950b | 44 | |
5b930493 | 45 | targets += vdso-syms.lds |
6c3652ef | 46 | obj-$(VDSO64-y) += vdso-syms.lds |
5b930493 RM |
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/' \ | |
f2dbe03d | 52 | -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' |
5b930493 | 53 | quiet_cmd_vdsosym = VDSOSYM $@ |
f2dbe03d RM |
54 | define cmd_vdsosym |
55 | $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ | |
56 | endef | |
5b930493 RM |
57 | |
58 | $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE | |
59 | $(call if_changed,vdsosym) | |
60 | ||
0249c9c1 RM |
61 | # |
62 | # Build multiple 32-bit vDSO images to choose from at boot time. | |
63 | # | |
6c3652ef | 64 | obj-$(VDSO32-y) += vdso32-syms.lds |
6a52e4b1 | 65 | vdso32.so-$(VDSO32-y) += int80 |
00f8b1bc | 66 | vdso32.so-$(CONFIG_COMPAT) += syscall |
0249c9c1 RM |
67 | vdso32.so-$(VDSO32-y) += sysenter |
68 | ||
2c158269 RM |
69 | vdso32-images = $(vdso32.so-y:%=vdso32-%.so) |
70 | ||
0249c9c1 RM |
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 | |
2c158269 | 79 | targets += $(vdso32-images) $(vdso32-images:=.dbg) |
0249c9c1 RM |
80 | targets += vdso32/note.o $(vdso32.so-y:%=vdso32/%.o) |
81 | ||
2c158269 | 82 | extra-y += $(vdso32-images) |
0249c9c1 | 83 | |
2c158269 | 84 | $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%) |
6c3652ef | 85 | |
0249c9c1 | 86 | KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) |
2c158269 RM |
87 | $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) |
88 | $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32 | |
0249c9c1 | 89 | |
2c158269 RM |
90 | $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \ |
91 | $(obj)/vdso32/vdso32.lds \ | |
92 | $(obj)/vdso32/note.o \ | |
93 | $(obj)/vdso32/%.o | |
0249c9c1 RM |
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 | ||
125 | VDSO_LDFLAGS = -fPIC -shared $(call ld-option, -Wl$(comma)--hash-style=sysv) | |
126 | ||
127 | # | |
128 | # Install the unstripped copy of vdso*.so listed in $(vdso-install-y). | |
129 | # | |
f79eb83b RM |
130 | quiet_cmd_vdso_install = INSTALL $@ |
131 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
0249c9c1 | 132 | $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE |
f79eb83b RM |
133 | @mkdir -p $(MODLIB)/vdso |
134 | $(call cmd,vdso_install) | |
135 | ||
0249c9c1 RM |
136 | PHONY += vdso_install $(vdso-install-y) |
137 | vdso_install: $(vdso-install-y) | |
d531b4fd SR |
138 | |
139 | clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80* |