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 vgetcpu.o vgettimeofday.o !! 9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
8 vgetrandom-chacha.o sigreturn.o <<
9 10
10 # Common compiler flags between ABIs. 11 # Common compiler flags between ABIs.
11 ccflags-vdso := \ 12 ccflags-vdso := \
12 $(filter -I%,$(KBUILD_CFLAGS)) \ 13 $(filter -I%,$(KBUILD_CFLAGS)) \
13 $(filter -E%,$(KBUILD_CFLAGS)) \ 14 $(filter -E%,$(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 $(CLANG_FLAGS) \ !! 18 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
17 -D__VDSO__ 19 -D__VDSO__
18 20
>> 21 ifndef CONFIG_64BIT
>> 22 ccflags-vdso += -DBUILD_VDSO32
>> 23 endif
>> 24
>> 25 ifdef CONFIG_CC_IS_CLANG
>> 26 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
>> 27 endif
>> 28
>> 29 #
>> 30 # The -fno-jump-tables flag only prevents the compiler from generating
>> 31 # jump tables but does not prevent the compiler from emitting absolute
>> 32 # offsets.
19 cflags-vdso := $(ccflags-vdso) \ 33 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% 34 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22 -O2 -g -fno-strict-aliasing -fno-commo !! 35 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
>> 36 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
23 -fno-stack-protector -fno-jump-tables 37 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
24 $(call cc-option, -fno-asynchronous-un 38 $(call cc-option, -fno-asynchronous-unwind-tables) \
25 $(call cc-option, -fno-stack-protector 39 $(call cc-option, -fno-stack-protector)
26 aflags-vdso := $(ccflags-vdso) \ 40 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 41 -D__ASSEMBLY__ -Wa,-gdwarf-2
28 42
29 ifneq ($(c-gettimeofday-y),) 43 ifneq ($(c-gettimeofday-y),)
30 CFLAGS_vgettimeofday.o += -include $(c-getti !! 44 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
>> 45
>> 46 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
>> 47 # library on a 64bit kernel.
>> 48 # Note: Needs to be included before than the generic library.
>> 49 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
>> 50 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
>> 51 endif
>> 52
>> 53 CFLAGS_REMOVE_vgettimeofday.o = -pg
>> 54
>> 55 DISABLE_VDSO := n
>> 56
>> 57 #
>> 58 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
>> 59 # the base address of VDSO, the linker will emit a R_MIPS_PC32
>> 60 # relocation in binutils > 2.25 but it will fail with older versions
>> 61 # because that relocation is not supported for that symbol. As a result
>> 62 # of which we are forced to disable the VDSO symbols when building
>> 63 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
>> 64 # can't use other methods to get the base address of VDSO please refer to
>> 65 # the comments on that file.
>> 66 #
>> 67 ifndef CONFIG_CPU_MIPSR6
>> 68 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
>> 69 $(warning MIPS VDSO requires binutils >= 2.25)
>> 70 DISABLE_VDSO := y
>> 71 endif
>> 72 endif
>> 73
>> 74 #
>> 75 # GCC (at least up to version 9.2) appears to emit function calls that make use
>> 76 # of the GOT when targeting microMIPS, which we can't use in the VDSO due to
>> 77 # the lack of relocations. As such, we disable the VDSO for microMIPS builds.
>> 78 #
>> 79 ifdef CONFIG_CPU_MICROMIPS
>> 80 DISABLE_VDSO := y
31 endif 81 endif
32 82
33 ifneq ($(c-getrandom-y),) !! 83 ifeq ($(DISABLE_VDSO),y)
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 84 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
>> 85 ccflags-vdso += -DDISABLE_MIPS_VDSO
35 endif 86 endif
36 87
37 # VDSO linker flags. 88 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname !! 89 VDSO_LDFLAGS := \
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl !! 90 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
40 --hash-style=sysv --build-id -T !! 91 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
>> 92 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
>> 93
>> 94 CFLAGS_REMOVE_vdso.o = -pg
>> 95
>> 96 GCOV_PROFILE := n
>> 97 UBSAN_SANITIZE := n
>> 98 KCOV_INSTRUMENT := n
>> 99
>> 100 # Check that we don't have PIC 'jalr t9' calls left
>> 101 quiet_cmd_vdso_mips_check = VDSOCHK $@
>> 102 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
>> 103 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
>> 104 rm -f $@; /bin/false); fi
41 105
42 # 106 #
43 # Shared build commands. 107 # Shared build commands.
44 # 108 #
45 109
46 quiet_cmd_vdsold_and_vdso_check = LD $@ 110 quiet_cmd_vdsold_and_vdso_check = LD $@
47 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 $@
48 116
49 quiet_cmd_vdsoas_o_S = AS $@ !! 117 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 118 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
51 119
52 # Generate VDSO offsets using helper script !! 120 # Strip rule for the raw .so files
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 121 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
54 quiet_cmd_vdsosym = VDSOSYM $@ !! 122 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) !! 123 $(call if_changed,objcopy)
>> 124
>> 125 hostprogs := genvdso
56 126
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 127 quiet_cmd_genvdso = GENVDSO $@
58 $(call if_changed,vdsosym) !! 128 define cmd_genvdso
>> 129 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 130 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 131 endef
59 132
60 # 133 #
61 # Build native VDSO. 134 # Build native VDSO.
62 # 135 #
63 136
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 137 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
65 138
66 targets += $(obj-vdso-y) 139 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so !! 140 targets += vdso.lds
>> 141 targets += vdso.so.dbg.raw vdso.so.raw
>> 142 targets += vdso.so.dbg vdso.so
>> 143 targets += vdso-image.c
68 144
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 145 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70 146
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 147 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 148 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
73 149
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 150 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
75 151
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 152 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_chec 153 $(call if_changed,vdsold_and_vdso_check)
78 154
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 155 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 156 $(obj)/genvdso FORCE
81 $(call if_changed,objcopy) !! 157 $(call if_changed,genvdso)
>> 158
>> 159 obj-y += vdso-image.o
>> 160
>> 161 #
>> 162 # Build O32 VDSO.
>> 163 #
>> 164
>> 165 # Define these outside the ifdef to ensure they are picked up by clean.
>> 166 targets += $(obj-vdso-y:%.o=%-o32.o)
>> 167 targets += vdso-o32.lds
>> 168 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
>> 169 targets += vdso-o32.so.dbg vdso-o32.so
>> 170 targets += vdso-o32-image.c
>> 171
>> 172 ifdef CONFIG_MIPS32_O32
82 173
83 obj-y += vdso.o !! 174 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
>> 175
>> 176 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
>> 177 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
>> 178
>> 179 $(obj)/%-o32.o: $(src)/%.S FORCE
>> 180 $(call if_changed_dep,vdsoas_o_S)
>> 181
>> 182 $(obj)/%-o32.o: $(src)/%.c FORCE
>> 183 $(call cmd,force_checksrc)
>> 184 $(call if_changed_rule,cc_o_c)
>> 185
>> 186 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
>> 187 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
>> 188 $(call if_changed_dep,cpp_lds_S)
>> 189
>> 190 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
>> 191 $(call if_changed,vdsold_and_vdso_check)
>> 192
>> 193 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
>> 194 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
>> 195 $(obj)/genvdso FORCE
>> 196 $(call if_changed,genvdso)
>> 197
>> 198 obj-y += vdso-o32-image.o
>> 199
>> 200 endif
>> 201
>> 202 #
>> 203 # Build N32 VDSO.
>> 204 #
>> 205
>> 206 targets += $(obj-vdso-y:%.o=%-n32.o)
>> 207 targets += vdso-n32.lds
>> 208 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
>> 209 targets += vdso-n32.so.dbg vdso-n32.so
>> 210 targets += vdso-n32-image.c
>> 211
>> 212 ifdef CONFIG_MIPS32_N32
>> 213
>> 214 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
>> 215
>> 216 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
>> 217 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
>> 218
>> 219 $(obj)/%-n32.o: $(src)/%.S FORCE
>> 220 $(call if_changed_dep,vdsoas_o_S)
>> 221
>> 222 $(obj)/%-n32.o: $(src)/%.c FORCE
>> 223 $(call cmd,force_checksrc)
>> 224 $(call if_changed_rule,cc_o_c)
>> 225
>> 226 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
>> 227 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
>> 228 $(call if_changed_dep,cpp_lds_S)
>> 229
>> 230 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
>> 231 $(call if_changed,vdsold_and_vdso_check)
>> 232
>> 233 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
>> 234 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
>> 235 $(obj)/genvdso FORCE
>> 236 $(call if_changed,genvdso)
>> 237
>> 238 obj-y += vdso-n32-image.o
>> 239
>> 240 endif
84 241
85 $(obj)/vdso.o : $(obj)/vdso.so !! 242 # FIXME: Need install rule for debug.
>> 243 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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