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 # Sanitizer runtimes are unavailable and cannot be linked here.
>> 5 KCSAN_SANITIZE := n
>> 6
4 # Include the generic Makefile to check the bu 7 # Include the generic Makefile to check the built vdso.
5 include $(srctree)/lib/vdso/Makefile 8 include $(srctree)/lib/vdso/Makefile
6 9
7 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o !! 10 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
8 vgetrandom-chacha.o sigreturn.o <<
9 11
10 # Common compiler flags between ABIs. 12 # Common compiler flags between ABIs.
11 ccflags-vdso := \ 13 ccflags-vdso := \
12 $(filter -I%,$(KBUILD_CFLAGS)) \ 14 $(filter -I%,$(KBUILD_CFLAGS)) \
13 $(filter -E%,$(KBUILD_CFLAGS)) \ 15 $(filter -E%,$(KBUILD_CFLAGS)) \
>> 16 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ 17 $(filter -march=%,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 18 $(filter -m%-float,$(KBUILD_CFLAGS)) \
>> 19 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
16 $(CLANG_FLAGS) \ 20 $(CLANG_FLAGS) \
17 -D__VDSO__ 21 -D__VDSO__
18 22
>> 23 ifndef CONFIG_64BIT
>> 24 ccflags-vdso += -DBUILD_VDSO32
>> 25 endif
>> 26
>> 27 #
>> 28 # The -fno-jump-tables flag only prevents the compiler from generating
>> 29 # jump tables but does not prevent the compiler from emitting absolute
>> 30 # offsets.
19 cflags-vdso := $(ccflags-vdso) \ 31 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% 32 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22 -O2 -g -fno-strict-aliasing -fno-commo !! 33 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
>> 34 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
23 -fno-stack-protector -fno-jump-tables 35 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
24 $(call cc-option, -fno-asynchronous-un !! 36 $(call cc-option, -fno-asynchronous-unwind-tables)
25 $(call cc-option, -fno-stack-protector <<
26 aflags-vdso := $(ccflags-vdso) \ 37 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 38 -D__ASSEMBLY__ -Wa,-gdwarf-2
28 39
29 ifneq ($(c-gettimeofday-y),) 40 ifneq ($(c-gettimeofday-y),)
30 CFLAGS_vgettimeofday.o += -include $(c-getti !! 41 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
>> 42
>> 43 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
>> 44 # library on a 64bit kernel.
>> 45 # Note: Needs to be included before than the generic library.
>> 46 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
>> 47 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
31 endif 48 endif
32 49
33 ifneq ($(c-getrandom-y),) !! 50 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 51
>> 52 ifdef CONFIG_MIPS_DISABLE_VDSO
>> 53 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
35 endif 54 endif
36 55
37 # VDSO linker flags. 56 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname 57 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl !! 58 $(filter -E%,$(KBUILD_CFLAGS)) -shared \
40 --hash-style=sysv --build-id -T !! 59 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
>> 60
>> 61 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
>> 62
>> 63 GCOV_PROFILE := n
>> 64 UBSAN_SANITIZE := n
>> 65 KCOV_INSTRUMENT := n
>> 66
>> 67 # Check that we don't have PIC 'jalr t9' calls left
>> 68 quiet_cmd_vdso_mips_check = VDSOCHK $@
>> 69 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \
>> 70 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
>> 71 rm -f $@; /bin/false); fi
41 72
42 # 73 #
43 # Shared build commands. 74 # Shared build commands.
44 # 75 #
45 76
46 quiet_cmd_vdsold_and_vdso_check = LD $@ 77 quiet_cmd_vdsold_and_vdso_check = LD $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 78 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
48 79
49 quiet_cmd_vdsoas_o_S = AS $@ !! 80 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 81 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
51 82
52 # Generate VDSO offsets using helper script !! 83 # Strip rule for the raw .so files
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 84 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
54 quiet_cmd_vdsosym = VDSOSYM $@ !! 85 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) !! 86 $(call if_changed,objcopy)
56 87
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 88 hostprogs := genvdso
58 $(call if_changed,vdsosym) !! 89
>> 90 quiet_cmd_genvdso = GENVDSO $@
>> 91 define cmd_genvdso
>> 92 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 93 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 94 endef
59 95
60 # 96 #
61 # Build native VDSO. 97 # Build native VDSO.
62 # 98 #
63 99
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 100 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
65 101
66 targets += $(obj-vdso-y) 102 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so !! 103 targets += vdso.lds
>> 104 targets += vdso.so.dbg.raw vdso.so.raw
>> 105 targets += vdso.so.dbg vdso.so
>> 106 targets += vdso-image.c
68 107
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 108 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70 109
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 110 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 111 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
73 112
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 113 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
75 114
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 115 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_chec 116 $(call if_changed,vdsold_and_vdso_check)
78 117
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 118 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 119 $(obj)/genvdso FORCE
81 $(call if_changed,objcopy) !! 120 $(call if_changed,genvdso)
>> 121
>> 122 obj-y += vdso-image.o
>> 123
>> 124 #
>> 125 # Build O32 VDSO.
>> 126 #
>> 127
>> 128 # Define these outside the ifdef to ensure they are picked up by clean.
>> 129 targets += $(obj-vdso-y:%.o=%-o32.o)
>> 130 targets += vdso-o32.lds
>> 131 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
>> 132 targets += vdso-o32.so.dbg vdso-o32.so
>> 133 targets += vdso-o32-image.c
>> 134
>> 135 ifdef CONFIG_MIPS32_O32
>> 136
>> 137 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
>> 138
>> 139 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
>> 140 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
>> 141
>> 142 $(obj)/%-o32.o: $(src)/%.S FORCE
>> 143 $(call if_changed_dep,vdsoas_o_S)
>> 144
>> 145 $(obj)/%-o32.o: $(src)/%.c FORCE
>> 146 $(call cmd,force_checksrc)
>> 147 $(call if_changed_rule,cc_o_c)
>> 148
>> 149 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
>> 150 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
>> 151 $(call if_changed_dep,cpp_lds_S)
82 152
83 obj-y += vdso.o !! 153 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
>> 154 $(call if_changed,vdsold_and_vdso_check)
>> 155
>> 156 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
>> 157 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
>> 158 $(obj)/genvdso FORCE
>> 159 $(call if_changed,genvdso)
>> 160
>> 161 obj-y += vdso-o32-image.o
>> 162
>> 163 endif
>> 164
>> 165 #
>> 166 # Build N32 VDSO.
>> 167 #
>> 168
>> 169 targets += $(obj-vdso-y:%.o=%-n32.o)
>> 170 targets += vdso-n32.lds
>> 171 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
>> 172 targets += vdso-n32.so.dbg vdso-n32.so
>> 173 targets += vdso-n32-image.c
>> 174
>> 175 ifdef CONFIG_MIPS32_N32
>> 176
>> 177 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
>> 178
>> 179 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
>> 180 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
>> 181
>> 182 $(obj)/%-n32.o: $(src)/%.S FORCE
>> 183 $(call if_changed_dep,vdsoas_o_S)
>> 184
>> 185 $(obj)/%-n32.o: $(src)/%.c FORCE
>> 186 $(call cmd,force_checksrc)
>> 187 $(call if_changed_rule,cc_o_c)
>> 188
>> 189 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
>> 190 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
>> 191 $(call if_changed_dep,cpp_lds_S)
>> 192
>> 193 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
>> 194 $(call if_changed,vdsold_and_vdso_check)
>> 195
>> 196 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
>> 197 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
>> 198 $(obj)/genvdso FORCE
>> 199 $(call if_changed,genvdso)
>> 200
>> 201 obj-y += vdso-n32-image.o
>> 202
>> 203 endif
84 204
85 $(obj)/vdso.o : $(obj)/vdso.so !! 205 # FIXME: Need install rule for debug.
>> 206 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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