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 ifdef CONFIG_CC_IS_CLANG
>> 22 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
>> 23 endif
>> 24
>> 25 #
>> 26 # The -fno-jump-tables flag only prevents the compiler from generating
>> 27 # jump tables but does not prevent the compiler from emitting absolute
>> 28 # offsets.
19 cflags-vdso := $(ccflags-vdso) \ 29 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% 30 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22 -O2 -g -fno-strict-aliasing -fno-commo !! 31 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
23 -fno-stack-protector -fno-jump-tables 32 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
24 $(call cc-option, -fno-asynchronous-un 33 $(call cc-option, -fno-asynchronous-unwind-tables) \
25 $(call cc-option, -fno-stack-protector 34 $(call cc-option, -fno-stack-protector)
26 aflags-vdso := $(ccflags-vdso) \ 35 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 36 -D__ASSEMBLY__ -Wa,-gdwarf-2
28 37
29 ifneq ($(c-gettimeofday-y),) 38 ifneq ($(c-gettimeofday-y),)
30 CFLAGS_vgettimeofday.o += -include $(c-getti !! 39 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
>> 40
>> 41 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
>> 42 # library on a 64bit kernel.
>> 43 # Note: Needs to be included before than the generic library.
>> 44 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
>> 45 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
31 endif 46 endif
32 47
33 ifneq ($(c-getrandom-y),) !! 48 CFLAGS_REMOVE_vgettimeofday.o = -pg
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 49
>> 50 #
>> 51 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
>> 52 # the base address of VDSO, the linker will emit a R_MIPS_PC32
>> 53 # relocation in binutils > 2.25 but it will fail with older versions
>> 54 # because that relocation is not supported for that symbol. As a result
>> 55 # of which we are forced to disable the VDSO symbols when building
>> 56 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
>> 57 # can't use other methods to get the base address of VDSO please refer to
>> 58 # the comments on that file.
>> 59 #
>> 60 ifndef CONFIG_CPU_MIPSR6
>> 61 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
>> 62 $(warning MIPS VDSO requires binutils >= 2.25)
>> 63 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
>> 64 ccflags-vdso += -DDISABLE_MIPS_VDSO
>> 65 endif
35 endif 66 endif
36 67
37 # VDSO linker flags. 68 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname !! 69 VDSO_LDFLAGS := \
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl !! 70 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
40 --hash-style=sysv --build-id -T !! 71 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
>> 72 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
>> 73
>> 74 CFLAGS_REMOVE_vdso.o = -pg
>> 75
>> 76 GCOV_PROFILE := n
>> 77 UBSAN_SANITIZE := n
>> 78 KCOV_INSTRUMENT := n
41 79
42 # 80 #
43 # Shared build commands. 81 # Shared build commands.
44 # 82 #
45 83
46 quiet_cmd_vdsold_and_vdso_check = LD $@ 84 quiet_cmd_vdsold_and_vdso_check = LD $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 85 cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
>> 86
>> 87 quiet_cmd_vdsold = VDSO $@
>> 88 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
>> 89 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
48 90
49 quiet_cmd_vdsoas_o_S = AS $@ !! 91 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 92 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
51 93
52 # Generate VDSO offsets using helper script !! 94 # Strip rule for the raw .so files
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 95 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
54 quiet_cmd_vdsosym = VDSOSYM $@ !! 96 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) !! 97 $(call if_changed,objcopy)
56 98
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 99 hostprogs-y := genvdso
58 $(call if_changed,vdsosym) !! 100
>> 101 quiet_cmd_genvdso = GENVDSO $@
>> 102 define cmd_genvdso
>> 103 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 104 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 105 endef
59 106
60 # 107 #
61 # Build native VDSO. 108 # Build native VDSO.
62 # 109 #
63 110
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 111 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
65 112
66 targets += $(obj-vdso-y) 113 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so !! 114 targets += vdso.lds
>> 115 targets += vdso.so.dbg.raw vdso.so.raw
>> 116 targets += vdso.so.dbg vdso.so
>> 117 targets += vdso-image.c
68 118
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 119 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70 120
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 121 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 122 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
73 123
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 124 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
75 125
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 126 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_chec 127 $(call if_changed,vdsold_and_vdso_check)
78 128
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 129 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 130 $(obj)/genvdso FORCE
81 $(call if_changed,objcopy) !! 131 $(call if_changed,genvdso)
>> 132
>> 133 obj-y += vdso-image.o
>> 134
>> 135 #
>> 136 # Build O32 VDSO.
>> 137 #
>> 138
>> 139 # Define these outside the ifdef to ensure they are picked up by clean.
>> 140 targets += $(obj-vdso-y:%.o=%-o32.o)
>> 141 targets += vdso-o32.lds
>> 142 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
>> 143 targets += vdso-o32.so.dbg vdso-o32.so
>> 144 targets += vdso-o32-image.c
>> 145
>> 146 ifdef CONFIG_MIPS32_O32
>> 147
>> 148 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
>> 149
>> 150 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
>> 151 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
>> 152
>> 153 $(obj)/%-o32.o: $(src)/%.S FORCE
>> 154 $(call if_changed_dep,vdsoas_o_S)
>> 155
>> 156 $(obj)/%-o32.o: $(src)/%.c FORCE
>> 157 $(call cmd,force_checksrc)
>> 158 $(call if_changed_rule,cc_o_c)
>> 159
>> 160 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
>> 161 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
>> 162 $(call if_changed_dep,cpp_lds_S)
82 163
83 obj-y += vdso.o !! 164 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
>> 165 $(call if_changed,vdsold_and_vdso_check)
>> 166
>> 167 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
>> 168 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
>> 169 $(obj)/genvdso FORCE
>> 170 $(call if_changed,genvdso)
>> 171
>> 172 obj-y += vdso-o32-image.o
>> 173
>> 174 endif
>> 175
>> 176 #
>> 177 # Build N32 VDSO.
>> 178 #
>> 179
>> 180 targets += $(obj-vdso-y:%.o=%-n32.o)
>> 181 targets += vdso-n32.lds
>> 182 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
>> 183 targets += vdso-n32.so.dbg vdso-n32.so
>> 184 targets += vdso-n32-image.c
>> 185
>> 186 ifdef CONFIG_MIPS32_N32
>> 187
>> 188 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
>> 189
>> 190 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
>> 191 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
>> 192
>> 193 $(obj)/%-n32.o: $(src)/%.S FORCE
>> 194 $(call if_changed_dep,vdsoas_o_S)
>> 195
>> 196 $(obj)/%-n32.o: $(src)/%.c FORCE
>> 197 $(call cmd,force_checksrc)
>> 198 $(call if_changed_rule,cc_o_c)
>> 199
>> 200 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
>> 201 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
>> 202 $(call if_changed_dep,cpp_lds_S)
>> 203
>> 204 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
>> 205 $(call if_changed,vdsold_and_vdso_check)
>> 206
>> 207 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
>> 208 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
>> 209 $(obj)/genvdso FORCE
>> 210 $(call if_changed,genvdso)
>> 211
>> 212 obj-y += vdso-n32-image.o
>> 213
>> 214 endif
84 215
85 $(obj)/vdso.o : $(obj)/vdso.so !! 216 # FIXME: Need install rule for debug.
>> 217 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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