Commit | Line | Data |
---|---|---|
2aae950b | 1 | # |
0249c9c1 | 2 | # Building vDSO images for x86. |
2aae950b AK |
3 | # |
4 | ||
67424d5a | 5 | KBUILD_CFLAGS += $(DISABLE_LTO) |
ef7f0d6a | 6 | KASAN_SANITIZE := n |
67424d5a | 7 | |
0249c9c1 | 8 | VDSO64-$(CONFIG_X86_64) := y |
1a21d4e0 | 9 | VDSOX32-$(CONFIG_X86_X32_ABI) := y |
0249c9c1 RM |
10 | VDSO32-$(CONFIG_X86_32) := y |
11 | VDSO32-$(CONFIG_COMPAT) := y | |
12 | ||
2aae950b | 13 | # files to link into the vdso |
da861e18 | 14 | vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o |
1a21d4e0 | 15 | |
2aae950b | 16 | # files to link into kernel |
b4b541a6 | 17 | obj-y += vma.o |
6f121e54 AL |
18 | |
19 | # vDSO images to build | |
20 | vdso_img-$(VDSO64-y) += 64 | |
21 | vdso_img-$(VDSOX32-y) += x32 | |
22 | vdso_img-$(VDSO32-y) += 32-int80 | |
23 | vdso_img-$(CONFIG_COMPAT) += 32-syscall | |
24 | vdso_img-$(VDSO32-y) += 32-sysenter | |
25 | ||
26 | obj-$(VDSO32-y) += vdso32-setup.o | |
2aae950b | 27 | |
e0bf7b86 | 28 | vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) |
2aae950b AK |
29 | |
30 | $(obj)/vdso.o: $(obj)/vdso.so | |
31 | ||
6f121e54 AL |
32 | targets += vdso.lds $(vobjs-y) |
33 | ||
34 | # Build the vDSO image C files and link them in. | |
35 | vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o) | |
36 | vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c) | |
37 | vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg) | |
38 | obj-y += $(vdso_img_objs) | |
39 | targets += $(vdso_img_cfiles) | |
40 | targets += $(vdso_img_sodbg) | |
da861e18 AL |
41 | .SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \ |
42 | $(vdso_img-y:%=$(obj)/vdso%.so) | |
2aae950b | 43 | |
d746d647 | 44 | export CPPFLAGS_vdso.lds += -P -C |
2aae950b | 45 | |
de2a8cf9 | 46 | VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ |
7f79ad15 | 47 | -Wl,--no-undefined \ |
67424d5a AK |
48 | -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \ |
49 | $(DISABLE_LTO) | |
2aae950b | 50 | |
6f121e54 | 51 | $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE |
16e48e7e | 52 | $(call if_changed,vdso) |
2aae950b | 53 | |
0a4f59d6 | 54 | HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi |
6f121e54 AL |
55 | hostprogs-y += vdso2c |
56 | ||
57 | quiet_cmd_vdso2c = VDSO2C $@ | |
58 | define cmd_vdso2c | |
da861e18 | 59 | $(obj)/vdso2c $< $(<:%.dbg=%) $@ |
6f121e54 AL |
60 | endef |
61 | ||
da861e18 | 62 | $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE |
6f121e54 | 63 | $(call if_changed,vdso2c) |
f79eb83b | 64 | |
6447facb AL |
65 | # |
66 | # Don't omit frame pointers for ease of userspace debugging, but do | |
67 | # optimize sibling calls. | |
68 | # | |
8705a49c | 69 | CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
6447facb | 70 | $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ |
46b57a76 AL |
71 | -fno-omit-frame-pointer -foptimize-sibling-calls \ |
72 | -DDISABLE_BRANCH_PROFILING | |
2aae950b | 73 | |
f6bc4029 | 74 | $(vobjs): KBUILD_CFLAGS += $(CFL) |
2aae950b | 75 | |
6447facb AL |
76 | # |
77 | # vDSO code runs in userspace and -pg doesn't help with profiling anyway. | |
78 | # | |
79 | CFLAGS_REMOVE_vdso-note.o = -pg | |
80 | CFLAGS_REMOVE_vclock_gettime.o = -pg | |
81 | CFLAGS_REMOVE_vgetcpu.o = -pg | |
82 | CFLAGS_REMOVE_vvar.o = -pg | |
83 | ||
1a21d4e0 L |
84 | # |
85 | # X32 processes use x32 vDSO to access 64bit kernel data. | |
86 | # | |
87 | # Build x32 vDSO image: | |
88 | # 1. Compile x32 vDSO as 64bit. | |
89 | # 2. Convert object files to x32. | |
90 | # 3. Build x32 VDSO image with x32 objects, which contains 64bit codes | |
91 | # so that it can reach 64bit address space with 64bit pointers. | |
92 | # | |
93 | ||
1a21d4e0 L |
94 | CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds) |
95 | VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \ | |
96 | -Wl,-soname=linux-vdso.so.1 \ | |
97 | -Wl,-z,max-page-size=4096 \ | |
98 | -Wl,-z,common-page-size=4096 | |
99 | ||
e0bf7b86 AL |
100 | # 64-bit objects to re-brand as x32 |
101 | vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y)) | |
102 | ||
103 | # x32-rebranded versions | |
104 | vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o) | |
105 | ||
106 | # same thing, but in the output directory | |
1a21d4e0 L |
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 | ||
6f121e54 | 116 | targets += vdsox32.lds $(vobjx32s-y) |
1a21d4e0 | 117 | |
da861e18 AL |
118 | $(obj)/%.so: OBJCOPYFLAGS := -S |
119 | $(obj)/%.so: $(obj)/%.so.dbg | |
120 | $(call if_changed,objcopy) | |
121 | ||
1a21d4e0 L |
122 | $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE |
123 | $(call if_changed,vdso) | |
124 | ||
0249c9c1 RM |
125 | # |
126 | # Build multiple 32-bit vDSO images to choose from at boot time. | |
127 | # | |
6a52e4b1 | 128 | vdso32.so-$(VDSO32-y) += int80 |
00f8b1bc | 129 | vdso32.so-$(CONFIG_COMPAT) += syscall |
0249c9c1 RM |
130 | vdso32.so-$(VDSO32-y) += sysenter |
131 | ||
2c158269 RM |
132 | vdso32-images = $(vdso32.so-y:%=vdso32-%.so) |
133 | ||
0249c9c1 | 134 | CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) |
67424d5a | 135 | VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1 |
0249c9c1 RM |
136 | |
137 | # This makes sure the $(obj) subdirectory exists even though vdso32/ | |
138 | # is not a kbuild sub-make subdirectory. | |
139 | override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ | |
140 | ||
141 | targets += vdso32/vdso32.lds | |
b9a4a56c | 142 | targets += vdso32/note.o vdso32/vclock_gettime.o $(vdso32.so-y:%=vdso32/%.o) |
da861e18 | 143 | targets += vdso32/vclock_gettime.o |
0249c9c1 | 144 | |
2c158269 | 145 | $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%) |
6c3652ef | 146 | |
0249c9c1 | 147 | KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) |
2c158269 RM |
148 | $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) |
149 | $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32 | |
0249c9c1 | 150 | |
7a59ed41 SS |
151 | KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
152 | KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32)) | |
153 | KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) | |
154 | KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32)) | |
155 | KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic | |
008cc907 PA |
156 | KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) |
157 | KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) | |
158 | KBUILD_CFLAGS_32 += -fno-omit-frame-pointer | |
46b57a76 | 159 | KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING |
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 | ||
0249c9c1 RM |
169 | # |
170 | # The DSO images are built using a special linker script. | |
171 | # | |
172 | quiet_cmd_vdso = VDSO $@ | |
173 | cmd_vdso = $(CC) -nostdlib -o $@ \ | |
174 | $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ | |
05d0b088 PA |
175 | -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ |
176 | sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' | |
0249c9c1 | 177 | |
67424d5a | 178 | VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \ |
dda1e95c | 179 | $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS) |
7bf99fb6 | 180 | GCOV_PROFILE := n |
0249c9c1 RM |
181 | |
182 | # | |
dda1e95c AL |
183 | # Install the unstripped copies of vdso*.so. If our toolchain supports |
184 | # build-id, install .build-id links as well. | |
0249c9c1 | 185 | # |
a934fb5b | 186 | quiet_cmd_vdso_install = INSTALL $(@:install_%=%) |
dda1e95c AL |
187 | define cmd_vdso_install |
188 | cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \ | |
189 | if readelf -n $< |grep -q 'Build ID'; then \ | |
190 | buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ | |
191 | first=`echo $$buildid | cut -b-2`; \ | |
192 | last=`echo $$buildid | cut -b3-`; \ | |
193 | mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ | |
194 | ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ | |
195 | fi | |
196 | endef | |
a934fb5b AL |
197 | |
198 | vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%) | |
199 | ||
200 | $(MODLIB)/vdso: FORCE | |
f79eb83b | 201 | @mkdir -p $(MODLIB)/vdso |
a934fb5b AL |
202 | |
203 | $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE | |
f79eb83b RM |
204 | $(call cmd,vdso_install) |
205 | ||
a934fb5b AL |
206 | PHONY += vdso_install $(vdso_img_insttargets) |
207 | vdso_install: $(vdso_img_insttargets) FORCE | |
d531b4fd | 208 | |
115db5c6 | 209 | clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80* vdso64* vdso-image-*.c vdsox32.so* |