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 obj-vdso-y := elf.o gettimeofday.o sigreturn.o
4 # Include the generic Makefile to check the bu <<
5 include $(srctree)/lib/vdso/Makefile <<
6 <<
7 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o <<
8 vgetrandom-chacha.o sigreturn.o <<
9 4
10 # Common compiler flags between ABIs. 5 # Common compiler flags between ABIs.
11 ccflags-vdso := \ 6 ccflags-vdso := \
12 $(filter -I%,$(KBUILD_CFLAGS)) \ 7 $(filter -I%,$(KBUILD_CFLAGS)) \
13 $(filter -E%,$(KBUILD_CFLAGS)) \ 8 $(filter -E%,$(KBUILD_CFLAGS)) \
>> 9 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ 10 $(filter -march=%,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 11 $(filter -m%-float,$(KBUILD_CFLAGS)) \
16 $(CLANG_FLAGS) \ <<
17 -D__VDSO__ 12 -D__VDSO__
18 13
>> 14 ifdef CONFIG_CC_IS_CLANG
>> 15 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
>> 16 endif
>> 17
19 cflags-vdso := $(ccflags-vdso) \ 18 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% 19 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22 -O2 -g -fno-strict-aliasing -fno-commo !! 20 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
23 -fno-stack-protector -fno-jump-tables !! 21 -DDISABLE_BRANCH_PROFILING \
24 $(call cc-option, -fno-asynchronous-un 22 $(call cc-option, -fno-asynchronous-unwind-tables) \
25 $(call cc-option, -fno-stack-protector 23 $(call cc-option, -fno-stack-protector)
26 aflags-vdso := $(ccflags-vdso) \ 24 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 25 -D__ASSEMBLY__ -Wa,-gdwarf-2
28 26
29 ifneq ($(c-gettimeofday-y),) !! 27 #
30 CFLAGS_vgettimeofday.o += -include $(c-getti !! 28 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
31 endif !! 29 # the base address of VDSO, the linker will emit a R_MIPS_PC32
32 !! 30 # relocation in binutils > 2.25 but it will fail with older versions
33 ifneq ($(c-getrandom-y),) !! 31 # because that relocation is not supported for that symbol. As a result
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 32 # of which we are forced to disable the VDSO symbols when building
>> 33 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
>> 34 # can't use other methods to get the base address of VDSO please refer to
>> 35 # the comments on that file.
>> 36 #
>> 37 ifndef CONFIG_CPU_MIPSR6
>> 38 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
>> 39 $(warning MIPS VDSO requires binutils >= 2.25)
>> 40 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
>> 41 ccflags-vdso += -DDISABLE_MIPS_VDSO
>> 42 endif
35 endif 43 endif
36 44
37 # VDSO linker flags. 45 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname !! 46 VDSO_LDFLAGS := \
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl !! 47 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
40 --hash-style=sysv --build-id -T !! 48 $(addprefix -Wl$(comma),$(filter -E%,$(KBUILD_CFLAGS))) \
>> 49 -nostdlib -shared -Wl,--hash-style=sysv -Wl,--build-id
>> 50
>> 51 GCOV_PROFILE := n
>> 52 UBSAN_SANITIZE := n
41 53
42 # 54 #
43 # Shared build commands. 55 # Shared build commands.
44 # 56 #
45 57
46 quiet_cmd_vdsold_and_vdso_check = LD $@ !! 58 quiet_cmd_vdsold = VDSO $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 59 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
>> 60 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
48 61
49 quiet_cmd_vdsoas_o_S = AS $@ 62 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 63 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
51 64
52 # Generate VDSO offsets using helper script !! 65 # Strip rule for the raw .so files
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 66 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
54 quiet_cmd_vdsosym = VDSOSYM $@ !! 67 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) !! 68 $(call if_changed,objcopy)
>> 69
>> 70 hostprogs-y := genvdso
56 71
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 72 quiet_cmd_genvdso = GENVDSO $@
58 $(call if_changed,vdsosym) !! 73 define cmd_genvdso
>> 74 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 75 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 76 endef
59 77
60 # 78 #
61 # Build native VDSO. 79 # Build native VDSO.
62 # 80 #
63 81
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 82 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
65 83
66 targets += $(obj-vdso-y) 84 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so !! 85 targets += vdso.lds
>> 86 targets += vdso.so.dbg.raw vdso.so.raw
>> 87 targets += vdso.so.dbg vdso.so
>> 88 targets += vdso-image.c
68 89
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 90 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70 91
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 92 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 93 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
73 94
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 95 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
75 96
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 97 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_chec !! 98 $(call if_changed,vdsold)
78 99
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 100 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 101 $(obj)/genvdso FORCE
81 $(call if_changed,objcopy) !! 102 $(call if_changed,genvdso)
>> 103
>> 104 obj-y += vdso-image.o
>> 105
>> 106 #
>> 107 # Build O32 VDSO.
>> 108 #
>> 109
>> 110 # Define these outside the ifdef to ensure they are picked up by clean.
>> 111 targets += $(obj-vdso-y:%.o=%-o32.o)
>> 112 targets += vdso-o32.lds
>> 113 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
>> 114 targets += vdso-o32.so.dbg vdso-o32.so
>> 115 targets += vdso-o32-image.c
>> 116
>> 117 ifdef CONFIG_MIPS32_O32
>> 118
>> 119 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
>> 120
>> 121 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
>> 122 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
>> 123
>> 124 $(obj)/%-o32.o: $(src)/%.S FORCE
>> 125 $(call if_changed_dep,vdsoas_o_S)
82 126
83 obj-y += vdso.o !! 127 $(obj)/%-o32.o: $(src)/%.c FORCE
>> 128 $(call cmd,force_checksrc)
>> 129 $(call if_changed_rule,cc_o_c)
>> 130
>> 131 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
>> 132 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
>> 133 $(call if_changed_dep,cpp_lds_S)
>> 134
>> 135 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
>> 136 $(call if_changed,vdsold)
>> 137
>> 138 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
>> 139 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
>> 140 $(obj)/genvdso FORCE
>> 141 $(call if_changed,genvdso)
>> 142
>> 143 obj-y += vdso-o32-image.o
>> 144
>> 145 endif
>> 146
>> 147 #
>> 148 # Build N32 VDSO.
>> 149 #
>> 150
>> 151 targets += $(obj-vdso-y:%.o=%-n32.o)
>> 152 targets += vdso-n32.lds
>> 153 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
>> 154 targets += vdso-n32.so.dbg vdso-n32.so
>> 155 targets += vdso-n32-image.c
>> 156
>> 157 ifdef CONFIG_MIPS32_N32
>> 158
>> 159 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
>> 160
>> 161 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
>> 162 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
>> 163
>> 164 $(obj)/%-n32.o: $(src)/%.S FORCE
>> 165 $(call if_changed_dep,vdsoas_o_S)
>> 166
>> 167 $(obj)/%-n32.o: $(src)/%.c FORCE
>> 168 $(call cmd,force_checksrc)
>> 169 $(call if_changed_rule,cc_o_c)
>> 170
>> 171 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
>> 172 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
>> 173 $(call if_changed_dep,cpp_lds_S)
>> 174
>> 175 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
>> 176 $(call if_changed,vdsold)
>> 177
>> 178 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
>> 179 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
>> 180 $(obj)/genvdso FORCE
>> 181 $(call if_changed,genvdso)
>> 182
>> 183 obj-y += vdso-n32-image.o
>> 184
>> 185 endif
84 186
85 $(obj)/vdso.o : $(obj)/vdso.so !! 187 # FIXME: Need install rule for debug.
>> 188 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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