1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO. 2 # Objects to go into the VDSO.
3 3
4 # Include the generic Makefile to check the bu !! 4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
>> 5 # the inclusion of generic Makefile.
>> 6 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
5 include $(srctree)/lib/vdso/Makefile 7 include $(srctree)/lib/vdso/Makefile
6 8
7 obj-vdso-y := elf.o vgettimeofday.o sigreturn. 9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
8 10
9 # Common compiler flags between ABIs. 11 # Common compiler flags between ABIs.
10 ccflags-vdso := \ 12 ccflags-vdso := \
11 $(filter -I%,$(KBUILD_CFLAGS)) \ 13 $(filter -I%,$(KBUILD_CFLAGS)) \
12 $(filter -E%,$(KBUILD_CFLAGS)) \ 14 $(filter -E%,$(KBUILD_CFLAGS)) \
13 $(filter -mmicromips,$(KBUILD_CFLAGS)) 15 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ 16 $(filter -march=%,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 17 $(filter -m%-float,$(KBUILD_CFLAGS)) \
16 $(filter -mno-loongson-%,$(KBUILD_CFLA 18 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
17 $(CLANG_FLAGS) \ <<
18 -D__VDSO__ 19 -D__VDSO__
19 20
20 ifndef CONFIG_64BIT 21 ifndef CONFIG_64BIT
21 ccflags-vdso += -DBUILD_VDSO32 22 ccflags-vdso += -DBUILD_VDSO32
22 endif 23 endif
23 24
>> 25 ifdef CONFIG_CC_IS_CLANG
>> 26 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
>> 27 endif
>> 28
24 # 29 #
25 # The -fno-jump-tables flag only prevents the 30 # The -fno-jump-tables flag only prevents the compiler from generating
26 # jump tables but does not prevent the compile 31 # jump tables but does not prevent the compiler from emitting absolute
27 # offsets. 32 # offsets.
28 cflags-vdso := $(ccflags-vdso) \ 33 cflags-vdso := $(ccflags-vdso) \
29 $(filter -W%,$(filter-out -Wa$(comma)% 34 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
30 -O3 -g -fPIC -fno-strict-aliasing -fno 35 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
31 -mrelax-pic-calls $(call cc-option, -m 36 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
32 -fno-stack-protector -fno-jump-tables 37 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
33 $(call cc-option, -fno-asynchronous-un !! 38 $(call cc-option, -fno-asynchronous-unwind-tables) \
>> 39 $(call cc-option, -fno-stack-protector)
34 aflags-vdso := $(ccflags-vdso) \ 40 aflags-vdso := $(ccflags-vdso) \
35 -D__ASSEMBLY__ -Wa,-gdwarf-2 41 -D__ASSEMBLY__ -Wa,-gdwarf-2
36 42
37 ifneq ($(c-gettimeofday-y),) 43 ifneq ($(c-gettimeofday-y),)
38 CFLAGS_vgettimeofday.o = -include $(c-gettimeo 44 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
39 45
40 # config-n32-o32-env.c prepares the environmen 46 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
41 # library on a 64bit kernel. 47 # library on a 64bit kernel.
42 # Note: Needs to be included before than the g 48 # Note: Needs to be included before than the generic library.
43 CFLAGS_vgettimeofday-o32.o = -include $(src)/c !! 49 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
44 CFLAGS_vgettimeofday-n32.o = -include $(src)/c !! 50 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
45 endif 51 endif
46 52
47 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTR !! 53 CFLAGS_REMOVE_vgettimeofday.o = -pg
>> 54
>> 55 DISABLE_VDSO := n
>> 56
>> 57 #
>> 58 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
>> 59 # the base address of VDSO, the linker will emit a R_MIPS_PC32
>> 60 # relocation in binutils > 2.25 but it will fail with older versions
>> 61 # because that relocation is not supported for that symbol. As a result
>> 62 # of which we are forced to disable the VDSO symbols when building
>> 63 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
>> 64 # can't use other methods to get the base address of VDSO please refer to
>> 65 # the comments on that file.
>> 66 #
>> 67 ifndef CONFIG_CPU_MIPSR6
>> 68 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
>> 69 $(warning MIPS VDSO requires binutils >= 2.25)
>> 70 DISABLE_VDSO := y
>> 71 endif
>> 72 endif
48 73
49 ifdef CONFIG_MIPS_DISABLE_VDSO !! 74 #
>> 75 # GCC (at least up to version 9.2) appears to emit function calls that make use
>> 76 # of the GOT when targeting microMIPS, which we can't use in the VDSO due to
>> 77 # the lack of relocations. As such, we disable the VDSO for microMIPS builds.
>> 78 #
>> 79 ifdef CONFIG_CPU_MICROMIPS
>> 80 DISABLE_VDSO := y
>> 81 endif
>> 82
>> 83 ifeq ($(DISABLE_VDSO),y)
50 obj-vdso-y := $(filter-out vgettimeofday.o, 84 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
>> 85 ccflags-vdso += -DDISABLE_MIPS_VDSO
51 endif 86 endif
52 87
53 # VDSO linker flags. 88 # VDSO linker flags.
54 ldflags-y := -Bsymbolic --no-undefined -soname !! 89 VDSO_LDFLAGS := \
55 $(filter -E%,$(KBUILD_CFLAGS)) -shared !! 90 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
56 -G 0 --eh-frame-hdr --hash-style=sysv !! 91 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
57 !! 92 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
58 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE) !! 93
>> 94 CFLAGS_REMOVE_vdso.o = -pg
>> 95
>> 96 GCOV_PROFILE := n
>> 97 UBSAN_SANITIZE := n
>> 98 KCOV_INSTRUMENT := n
59 99
60 # Check that we don't have PIC 'jalr t9' calls 100 # Check that we don't have PIC 'jalr t9' calls left
61 quiet_cmd_vdso_mips_check = VDSOCHK $@ 101 quiet_cmd_vdso_mips_check = VDSOCHK $@
62 cmd_vdso_mips_check = if $(OBJDUMP) --di !! 102 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
63 then (echo >&2 "$@: PIC 103 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
64 rm -f $@; /bin/fa 104 rm -f $@; /bin/false); fi
65 105
66 # 106 #
67 # Shared build commands. 107 # Shared build commands.
68 # 108 #
69 109
70 quiet_cmd_vdsold_and_vdso_check = LD $@ 110 quiet_cmd_vdsold_and_vdso_check = LD $@
71 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 111 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check); $(cmd_vdso_mips_check)
>> 112
>> 113 quiet_cmd_vdsold = VDSO $@
>> 114 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
>> 115 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
72 116
73 quiet_cmd_vdsoas_o_S = AS $@ 117 quiet_cmd_vdsoas_o_S = AS $@
74 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 118 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
75 119
76 # Strip rule for the raw .so files 120 # Strip rule for the raw .so files
77 $(obj)/%.so.raw: OBJCOPYFLAGS := -S 121 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
78 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE 122 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
79 $(call if_changed,objcopy) 123 $(call if_changed,objcopy)
80 124
81 hostprogs := genvdso 125 hostprogs := genvdso
82 126
83 quiet_cmd_genvdso = GENVDSO $@ 127 quiet_cmd_genvdso = GENVDSO $@
84 define cmd_genvdso 128 define cmd_genvdso
85 $(foreach file,$(filter %.raw,$^),cp $ 129 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
86 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg. 130 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
87 endef 131 endef
88 132
89 # 133 #
90 # Build native VDSO. 134 # Build native VDSO.
91 # 135 #
92 136
93 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 137 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
94 138
95 targets += $(obj-vdso-y) 139 targets += $(obj-vdso-y)
96 targets += vdso.lds 140 targets += vdso.lds
97 targets += vdso.so.dbg.raw vdso.so.raw 141 targets += vdso.so.dbg.raw vdso.so.raw
98 targets += vdso.so.dbg vdso.so 142 targets += vdso.so.dbg vdso.so
99 targets += vdso-image.c 143 targets += vdso-image.c
100 144
101 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 145 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
102 146
103 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 147 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
104 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 148 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
105 149
106 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 150 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
107 151
108 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj- 152 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
109 $(call if_changed,vdsold_and_vdso_chec 153 $(call if_changed,vdsold_and_vdso_check)
110 154
111 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $( 155 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
112 $(obj)/genvdso FORCE 156 $(obj)/genvdso FORCE
113 $(call if_changed,genvdso) 157 $(call if_changed,genvdso)
114 158
115 obj-y += vdso-image.o 159 obj-y += vdso-image.o
116 160
117 # 161 #
118 # Build O32 VDSO. 162 # Build O32 VDSO.
119 # 163 #
120 164
121 # Define these outside the ifdef to ensure the 165 # Define these outside the ifdef to ensure they are picked up by clean.
122 targets += $(obj-vdso-y:%.o=%-o32.o) 166 targets += $(obj-vdso-y:%.o=%-o32.o)
123 targets += vdso-o32.lds 167 targets += vdso-o32.lds
124 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw 168 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
125 targets += vdso-o32.so.dbg vdso-o32.so 169 targets += vdso-o32.so.dbg vdso-o32.so
126 targets += vdso-o32-image.c 170 targets += vdso-o32-image.c
127 171
128 ifdef CONFIG_MIPS32_O32 172 ifdef CONFIG_MIPS32_O32
129 173
130 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32. 174 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
131 175
132 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vds 176 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
133 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vds 177 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
134 178
135 $(obj)/%-o32.o: $(src)/%.S FORCE 179 $(obj)/%-o32.o: $(src)/%.S FORCE
136 $(call if_changed_dep,vdsoas_o_S) 180 $(call if_changed_dep,vdsoas_o_S)
137 181
138 $(obj)/%-o32.o: $(src)/%.c FORCE 182 $(obj)/%-o32.o: $(src)/%.c FORCE
139 $(call cmd,force_checksrc) 183 $(call cmd,force_checksrc)
140 $(call if_changed_rule,cc_o_c) 184 $(call if_changed_rule,cc_o_c)
141 185
142 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccfl 186 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
143 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE 187 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
144 $(call if_changed_dep,cpp_lds_S) 188 $(call if_changed_dep,cpp_lds_S)
145 189
146 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.ld 190 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
147 $(call if_changed,vdsold_and_vdso_chec 191 $(call if_changed,vdsold_and_vdso_check)
148 192
149 $(obj)/vdso-o32-image.c: VDSO_NAME := o32 193 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
150 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.db 194 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
151 $(obj)/genvdso FORCE 195 $(obj)/genvdso FORCE
152 $(call if_changed,genvdso) 196 $(call if_changed,genvdso)
153 197
154 obj-y += vdso-o32-image.o 198 obj-y += vdso-o32-image.o
155 199
156 endif 200 endif
157 201
158 # 202 #
159 # Build N32 VDSO. 203 # Build N32 VDSO.
160 # 204 #
161 205
162 targets += $(obj-vdso-y:%.o=%-n32.o) 206 targets += $(obj-vdso-y:%.o=%-n32.o)
163 targets += vdso-n32.lds 207 targets += vdso-n32.lds
164 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw 208 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
165 targets += vdso-n32.so.dbg vdso-n32.so 209 targets += vdso-n32.so.dbg vdso-n32.so
166 targets += vdso-n32-image.c 210 targets += vdso-n32-image.c
167 211
168 ifdef CONFIG_MIPS32_N32 212 ifdef CONFIG_MIPS32_N32
169 213
170 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32. 214 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
171 215
172 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vds 216 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
173 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vds 217 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
174 218
175 $(obj)/%-n32.o: $(src)/%.S FORCE 219 $(obj)/%-n32.o: $(src)/%.S FORCE
176 $(call if_changed_dep,vdsoas_o_S) 220 $(call if_changed_dep,vdsoas_o_S)
177 221
178 $(obj)/%-n32.o: $(src)/%.c FORCE 222 $(obj)/%-n32.o: $(src)/%.c FORCE
179 $(call cmd,force_checksrc) 223 $(call cmd,force_checksrc)
180 $(call if_changed_rule,cc_o_c) 224 $(call if_changed_rule,cc_o_c)
181 225
182 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccfl 226 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
183 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE 227 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
184 $(call if_changed_dep,cpp_lds_S) 228 $(call if_changed_dep,cpp_lds_S)
185 229
186 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.ld 230 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
187 $(call if_changed,vdsold_and_vdso_chec 231 $(call if_changed,vdsold_and_vdso_check)
188 232
189 $(obj)/vdso-n32-image.c: VDSO_NAME := n32 233 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
190 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.db 234 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
191 $(obj)/genvdso FORCE 235 $(obj)/genvdso FORCE
192 $(call if_changed,genvdso) 236 $(call if_changed,genvdso)
193 237
194 obj-y += vdso-n32-image.o 238 obj-y += vdso-n32-image.o
195 239
196 endif 240 endif
197 241
198 # FIXME: Need install rule for debug. 242 # FIXME: Need install rule for debug.
199 # Needs to deal with dependency for generation 243 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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