]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
2aae950b | 2 | # |
0249c9c1 | 3 | # Building vDSO images for x86. |
2aae950b AK |
4 | # |
5 | ||
67424d5a | 6 | KBUILD_CFLAGS += $(DISABLE_LTO) |
c0dd6716 JP |
7 | KASAN_SANITIZE := n |
8 | UBSAN_SANITIZE := n | |
9 | OBJECT_FILES_NON_STANDARD := y | |
67424d5a | 10 | |
5c9a8750 DV |
11 | # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. |
12 | KCOV_INSTRUMENT := n | |
13 | ||
0249c9c1 | 14 | VDSO64-$(CONFIG_X86_64) := y |
1a21d4e0 | 15 | VDSOX32-$(CONFIG_X86_X32_ABI) := y |
0249c9c1 | 16 | VDSO32-$(CONFIG_X86_32) := y |
ab8b82ee | 17 | VDSO32-$(CONFIG_IA32_EMULATION) := y |
0249c9c1 | 18 | |
2aae950b | 19 | # files to link into the vdso |
da861e18 | 20 | vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o |
1a21d4e0 | 21 | |
2aae950b | 22 | # files to link into kernel |
b4b541a6 | 23 | obj-y += vma.o |
c0dd6716 | 24 | OBJECT_FILES_NON_STANDARD_vma.o := n |
6f121e54 AL |
25 | |
26 | # vDSO images to build | |
27 | vdso_img-$(VDSO64-y) += 64 | |
28 | vdso_img-$(VDSOX32-y) += x32 | |
0a6d1fa0 | 29 | vdso_img-$(VDSO32-y) += 32 |
6f121e54 AL |
30 | |
31 | obj-$(VDSO32-y) += vdso32-setup.o | |
2aae950b | 32 | |
e0bf7b86 | 33 | vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) |
2aae950b AK |
34 | |
35 | $(obj)/vdso.o: $(obj)/vdso.so | |
36 | ||
6f121e54 AL |
37 | targets += vdso.lds $(vobjs-y) |
38 | ||
39 | # Build the vDSO image C files and link them in. | |
40 | vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o) | |
41 | vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c) | |
42 | vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg) | |
43 | obj-y += $(vdso_img_objs) | |
44 | targets += $(vdso_img_cfiles) | |
45 | targets += $(vdso_img_sodbg) | |
da861e18 AL |
46 | .SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \ |
47 | $(vdso_img-y:%=$(obj)/vdso%.so) | |
2aae950b | 48 | |
d746d647 | 49 | export CPPFLAGS_vdso.lds += -P -C |
2aae950b | 50 | |
de2a8cf9 | 51 | VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ |
7f79ad15 | 52 | -Wl,--no-undefined \ |
67424d5a AK |
53 | -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \ |
54 | $(DISABLE_LTO) | |
2aae950b | 55 | |
6f121e54 | 56 | $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE |
16e48e7e | 57 | $(call if_changed,vdso) |
2aae950b | 58 | |
d51306f1 | 59 | HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/$(SUBARCH)/include/uapi |
6f121e54 AL |
60 | hostprogs-y += vdso2c |
61 | ||
62 | quiet_cmd_vdso2c = VDSO2C $@ | |
63 | define cmd_vdso2c | |
da861e18 | 64 | $(obj)/vdso2c $< $(<:%.dbg=%) $@ |
6f121e54 AL |
65 | endef |
66 | ||
da861e18 | 67 | $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE |
6f121e54 | 68 | $(call if_changed,vdso2c) |
f79eb83b | 69 | |
6447facb AL |
70 | # |
71 | # Don't omit frame pointers for ease of userspace debugging, but do | |
72 | # optimize sibling calls. | |
73 | # | |
8705a49c | 74 | CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
6447facb | 75 | $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ |
46b57a76 | 76 | -fno-omit-frame-pointer -foptimize-sibling-calls \ |
2ef74cda | 77 | -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO $(RETPOLINE_VDSO_CFLAGS) |
2aae950b | 78 | |
2ef74cda | 79 | $(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) |
2aae950b | 80 | |
6447facb AL |
81 | # |
82 | # vDSO code runs in userspace and -pg doesn't help with profiling anyway. | |
83 | # | |
84 | CFLAGS_REMOVE_vdso-note.o = -pg | |
85 | CFLAGS_REMOVE_vclock_gettime.o = -pg | |
86 | CFLAGS_REMOVE_vgetcpu.o = -pg | |
87 | CFLAGS_REMOVE_vvar.o = -pg | |
88 | ||
1a21d4e0 L |
89 | # |
90 | # X32 processes use x32 vDSO to access 64bit kernel data. | |
91 | # | |
92 | # Build x32 vDSO image: | |
93 | # 1. Compile x32 vDSO as 64bit. | |
94 | # 2. Convert object files to x32. | |
95 | # 3. Build x32 VDSO image with x32 objects, which contains 64bit codes | |
96 | # so that it can reach 64bit address space with 64bit pointers. | |
97 | # | |
98 | ||
1a21d4e0 L |
99 | CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds) |
100 | VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \ | |
101 | -Wl,-soname=linux-vdso.so.1 \ | |
102 | -Wl,-z,max-page-size=4096 \ | |
103 | -Wl,-z,common-page-size=4096 | |
104 | ||
e0bf7b86 AL |
105 | # 64-bit objects to re-brand as x32 |
106 | vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y)) | |
107 | ||
108 | # x32-rebranded versions | |
109 | vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o) | |
110 | ||
111 | # same thing, but in the output directory | |
1a21d4e0 L |
112 | vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F) |
113 | ||
114 | # Convert 64bit object file to x32 for x32 vDSO. | |
115 | quiet_cmd_x32 = X32 $@ | |
116 | cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@ | |
117 | ||
118 | $(obj)/%-x32.o: $(obj)/%.o FORCE | |
119 | $(call if_changed,x32) | |
120 | ||
6f121e54 | 121 | targets += vdsox32.lds $(vobjx32s-y) |
1a21d4e0 | 122 | |
da861e18 AL |
123 | $(obj)/%.so: OBJCOPYFLAGS := -S |
124 | $(obj)/%.so: $(obj)/%.so.dbg | |
125 | $(call if_changed,objcopy) | |
126 | ||
1a21d4e0 L |
127 | $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE |
128 | $(call if_changed,vdso) | |
129 | ||
0249c9c1 | 130 | CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds) |
67424d5a | 131 | VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1 |
0249c9c1 | 132 | |
0249c9c1 | 133 | targets += vdso32/vdso32.lds |
f0702555 | 134 | targets += vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o |
da861e18 | 135 | targets += vdso32/vclock_gettime.o |
0249c9c1 | 136 | |
f24f9108 | 137 | KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO |
0a6d1fa0 AL |
138 | $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) |
139 | $(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32 | |
0249c9c1 | 140 | |
7a59ed41 SS |
141 | KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
142 | KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32)) | |
143 | KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) | |
144 | KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32)) | |
6b90bd4b | 145 | KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) |
2ef74cda | 146 | KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS_32)) |
7a59ed41 | 147 | KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic |
008cc907 PA |
148 | KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) |
149 | KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) | |
150 | KBUILD_CFLAGS_32 += -fno-omit-frame-pointer | |
46b57a76 | 151 | KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING |
2ef74cda | 152 | KBUILD_CFLAGS_32 += $(RETPOLINE_VDSO_CFLAGS) |
0a6d1fa0 | 153 | $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) |
7a59ed41 | 154 | |
0a6d1fa0 AL |
155 | $(obj)/vdso32.so.dbg: FORCE \ |
156 | $(obj)/vdso32/vdso32.lds \ | |
157 | $(obj)/vdso32/vclock_gettime.o \ | |
158 | $(obj)/vdso32/note.o \ | |
f0702555 AL |
159 | $(obj)/vdso32/system_call.o \ |
160 | $(obj)/vdso32/sigreturn.o | |
0249c9c1 RM |
161 | $(call if_changed,vdso) |
162 | ||
0249c9c1 RM |
163 | # |
164 | # The DSO images are built using a special linker script. | |
165 | # | |
166 | quiet_cmd_vdso = VDSO $@ | |
167 | cmd_vdso = $(CC) -nostdlib -o $@ \ | |
168 | $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ | |
05d0b088 PA |
169 | -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ |
170 | sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' | |
0249c9c1 | 171 | |
6b7e2654 | 172 | VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=both) \ |
dda1e95c | 173 | $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS) |
7bf99fb6 | 174 | GCOV_PROFILE := n |
0249c9c1 RM |
175 | |
176 | # | |
dda1e95c AL |
177 | # Install the unstripped copies of vdso*.so. If our toolchain supports |
178 | # build-id, install .build-id links as well. | |
0249c9c1 | 179 | # |
a934fb5b | 180 | quiet_cmd_vdso_install = INSTALL $(@:install_%=%) |
dda1e95c AL |
181 | define cmd_vdso_install |
182 | cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \ | |
183 | if readelf -n $< |grep -q 'Build ID'; then \ | |
184 | buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ | |
185 | first=`echo $$buildid | cut -b-2`; \ | |
186 | last=`echo $$buildid | cut -b3-`; \ | |
187 | mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ | |
188 | ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ | |
189 | fi | |
190 | endef | |
a934fb5b AL |
191 | |
192 | vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%) | |
193 | ||
194 | $(MODLIB)/vdso: FORCE | |
f79eb83b | 195 | @mkdir -p $(MODLIB)/vdso |
a934fb5b | 196 | |
2e8d696b | 197 | $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso |
f79eb83b RM |
198 | $(call cmd,vdso_install) |
199 | ||
a934fb5b | 200 | PHONY += vdso_install $(vdso_img_insttargets) |
2e8d696b | 201 | vdso_install: $(vdso_img_insttargets) |
d531b4fd | 202 | |
0a6d1fa0 | 203 | clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-*.c vdsox32.so* |