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