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Commit | Line | Data |
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2aae950b | 1 | # |
0249c9c1 | 2 | # Building vDSO images for x86. |
2aae950b AK |
3 | # |
4 | ||
67424d5a AK |
5 | KBUILD_CFLAGS += $(DISABLE_LTO) |
6 | ||
0249c9c1 | 7 | VDSO64-$(CONFIG_X86_64) := y |
1a21d4e0 | 8 | VDSOX32-$(CONFIG_X86_X32_ABI) := y |
0249c9c1 RM |
9 | VDSO32-$(CONFIG_X86_32) := y |
10 | VDSO32-$(CONFIG_COMPAT) := y | |
11 | ||
12 | vdso-install-$(VDSO64-y) += vdso.so | |
1a21d4e0 | 13 | vdso-install-$(VDSOX32-y) += vdsox32.so |
2c158269 | 14 | vdso-install-$(VDSO32-y) += $(vdso32-images) |
0249c9c1 RM |
15 | |
16 | ||
2aae950b | 17 | # files to link into the vdso |
8c49d9a7 | 18 | vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o |
2aae950b | 19 | |
1a21d4e0 L |
20 | vobjs-$(VDSOX32-y) += $(vobjx32s-compat) |
21 | ||
22 | # Filter out x32 objects. | |
23 | vobj64s := $(filter-out $(vobjx32s-compat),$(vobjs-y)) | |
24 | ||
2aae950b | 25 | # files to link into kernel |
b4b541a6 AL |
26 | obj-y += vma.o |
27 | obj-$(VDSO64-y) += vdso.o | |
1a21d4e0 | 28 | obj-$(VDSOX32-y) += vdsox32.o |
af65d648 | 29 | obj-$(VDSO32-y) += vdso32.o vdso32-setup.o |
2aae950b | 30 | |
1a21d4e0 | 31 | vobjs := $(foreach F,$(vobj64s),$(obj)/$F) |
2aae950b AK |
32 | |
33 | $(obj)/vdso.o: $(obj)/vdso.so | |
34 | ||
2b9c97e1 | 35 | targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) |
2aae950b | 36 | |
d746d647 | 37 | export CPPFLAGS_vdso.lds += -P -C |
2aae950b | 38 | |
de2a8cf9 | 39 | VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ |
7f79ad15 | 40 | -Wl,--no-undefined \ |
67424d5a AK |
41 | -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \ |
42 | $(DISABLE_LTO) | |
2aae950b AK |
43 | |
44 | $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so | |
45 | ||
f79eb83b | 46 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE |
16e48e7e | 47 | $(call if_changed,vdso) |
2aae950b | 48 | |
f79eb83b RM |
49 | $(obj)/%.so: OBJCOPYFLAGS := -S |
50 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
51 | $(call if_changed,objcopy) | |
52 | ||
6447facb AL |
53 | # |
54 | # Don't omit frame pointers for ease of userspace debugging, but do | |
55 | # optimize sibling calls. | |
56 | # | |
8705a49c | 57 | CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
6447facb AL |
58 | $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ |
59 | -fno-omit-frame-pointer -foptimize-sibling-calls | |
2aae950b | 60 | |
f6bc4029 | 61 | $(vobjs): KBUILD_CFLAGS += $(CFL) |
2aae950b | 62 | |
6447facb AL |
63 | # |
64 | # vDSO code runs in userspace and -pg doesn't help with profiling anyway. | |
65 | # | |
66 | CFLAGS_REMOVE_vdso-note.o = -pg | |
67 | CFLAGS_REMOVE_vclock_gettime.o = -pg | |
68 | CFLAGS_REMOVE_vgetcpu.o = -pg | |
69 | CFLAGS_REMOVE_vvar.o = -pg | |
70 | ||
5b930493 | 71 | targets += vdso-syms.lds |
6c3652ef | 72 | obj-$(VDSO64-y) += vdso-syms.lds |
5b930493 RM |
73 | |
74 | # | |
75 | # Match symbols in the DSO that look like VDSO*; produce a file of constants. | |
76 | # | |
77 | sed-vdsosym := -e 's/^00*/0/' \ | |
f2dbe03d | 78 | -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' |
5b930493 | 79 | quiet_cmd_vdsosym = VDSOSYM $@ |
f2dbe03d RM |
80 | define cmd_vdsosym |
81 | $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ | |
82 | endef | |
5b930493 RM |
83 | |
84 | $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE | |
85 | $(call if_changed,vdsosym) | |
86 | ||
1a21d4e0 L |
87 | # |
88 | # X32 processes use x32 vDSO to access 64bit kernel data. | |
89 | # | |
90 | # Build x32 vDSO image: | |
91 | # 1. Compile x32 vDSO as 64bit. | |
92 | # 2. Convert object files to x32. | |
93 | # 3. Build x32 VDSO image with x32 objects, which contains 64bit codes | |
94 | # so that it can reach 64bit address space with 64bit pointers. | |
95 | # | |
96 | ||
97 | targets += vdsox32-syms.lds | |
98 | obj-$(VDSOX32-y) += vdsox32-syms.lds | |
99 | ||
100 | CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds) | |
101 | VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \ | |
102 | -Wl,-soname=linux-vdso.so.1 \ | |
103 | -Wl,-z,max-page-size=4096 \ | |
104 | -Wl,-z,common-page-size=4096 | |
105 | ||
106 | vobjx32s-y := $(vobj64s:.o=-x32.o) | |
107 | vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F) | |
108 | ||
109 | # Convert 64bit object file to x32 for x32 vDSO. | |
110 | quiet_cmd_x32 = X32 $@ | |
111 | cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@ | |
112 | ||
113 | $(obj)/%-x32.o: $(obj)/%.o FORCE | |
114 | $(call if_changed,x32) | |
115 | ||
116 | targets += vdsox32.so vdsox32.so.dbg vdsox32.lds $(vobjx32s-y) | |
117 | ||
118 | $(obj)/vdsox32.o: $(src)/vdsox32.S $(obj)/vdsox32.so | |
119 | ||
120 | $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE | |
121 | $(call if_changed,vdso) | |
122 | ||
0249c9c1 RM |
123 | # |
124 | # Build multiple 32-bit vDSO images to choose from at boot time. | |
125 | # | |
6c3652ef | 126 | obj-$(VDSO32-y) += vdso32-syms.lds |
6a52e4b1 | 127 | vdso32.so-$(VDSO32-y) += int80 |
00f8b1bc | 128 | vdso32.so-$(CONFIG_COMPAT) += syscall |
0249c9c1 RM |
129 | vdso32.so-$(VDSO32-y) += sysenter |
130 | ||
2c158269 RM |
131 | vdso32-images = $(vdso32.so-y:%=vdso32-%.so) |
132 | ||
0249c9c1 | 133 | CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) |
67424d5a | 134 | VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1 |
0249c9c1 RM |
135 | |
136 | # This makes sure the $(obj) subdirectory exists even though vdso32/ | |
137 | # is not a kbuild sub-make subdirectory. | |
138 | override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ | |
139 | ||
140 | targets += vdso32/vdso32.lds | |
2c158269 | 141 | targets += $(vdso32-images) $(vdso32-images:=.dbg) |
b9a4a56c | 142 | targets += vdso32/note.o vdso32/vclock_gettime.o $(vdso32.so-y:%=vdso32/%.o) |
0249c9c1 | 143 | |
2c158269 | 144 | extra-y += $(vdso32-images) |
0249c9c1 | 145 | |
2c158269 | 146 | $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%) |
6c3652ef | 147 | |
0249c9c1 | 148 | KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) |
2c158269 RM |
149 | $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) |
150 | $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32 | |
0249c9c1 | 151 | |
7a59ed41 SS |
152 | KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
153 | KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32)) | |
154 | KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) | |
155 | KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32)) | |
156 | KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic | |
008cc907 PA |
157 | KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) |
158 | KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) | |
159 | KBUILD_CFLAGS_32 += -fno-omit-frame-pointer | |
7a59ed41 SS |
160 | $(vdso32-images:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) |
161 | ||
2c158269 RM |
162 | $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \ |
163 | $(obj)/vdso32/vdso32.lds \ | |
7a59ed41 | 164 | $(obj)/vdso32/vclock_gettime.o \ |
2c158269 RM |
165 | $(obj)/vdso32/note.o \ |
166 | $(obj)/vdso32/%.o | |
0249c9c1 RM |
167 | $(call if_changed,vdso) |
168 | ||
169 | # Make vdso32-*-syms.lds from each image, and then make sure they match. | |
170 | # The only difference should be that some do not define VDSO32_SYSENTER_RETURN. | |
171 | ||
172 | targets += vdso32-syms.lds $(vdso32.so-y:%=vdso32-%-syms.lds) | |
173 | ||
174 | quiet_cmd_vdso32sym = VDSOSYM $@ | |
175 | define cmd_vdso32sym | |
176 | if LC_ALL=C sort -u $(filter-out FORCE,$^) > $(@D)/.tmp_$(@F) && \ | |
177 | $(foreach H,$(filter-out FORCE,$^),\ | |
178 | if grep -q VDSO32_SYSENTER_RETURN $H; \ | |
179 | then diff -u $(@D)/.tmp_$(@F) $H; \ | |
180 | else sed /VDSO32_SYSENTER_RETURN/d $(@D)/.tmp_$(@F) | \ | |
181 | diff -u - $H; fi &&) : ;\ | |
182 | then mv -f $(@D)/.tmp_$(@F) $@; \ | |
183 | else rm -f $(@D)/.tmp_$(@F); exit 1; \ | |
184 | fi | |
185 | endef | |
186 | ||
187 | $(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE | |
188 | $(call if_changed,vdso32sym) | |
189 | ||
190 | # | |
191 | # The DSO images are built using a special linker script. | |
192 | # | |
193 | quiet_cmd_vdso = VDSO $@ | |
194 | cmd_vdso = $(CC) -nostdlib -o $@ \ | |
195 | $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ | |
05d0b088 PA |
196 | -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ |
197 | sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' | |
0249c9c1 | 198 | |
67424d5a AK |
199 | VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ |
200 | $(LTO_CFLAGS) | |
7bf99fb6 | 201 | GCOV_PROFILE := n |
0249c9c1 RM |
202 | |
203 | # | |
204 | # Install the unstripped copy of vdso*.so listed in $(vdso-install-y). | |
205 | # | |
f79eb83b RM |
206 | quiet_cmd_vdso_install = INSTALL $@ |
207 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
0249c9c1 | 208 | $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE |
f79eb83b RM |
209 | @mkdir -p $(MODLIB)/vdso |
210 | $(call cmd,vdso_install) | |
211 | ||
0249c9c1 RM |
212 | PHONY += vdso_install $(vdso-install-y) |
213 | vdso_install: $(vdso-install-y) | |
d531b4fd SR |
214 | |
215 | clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80* |