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