1 # SPDX-License-Identifier: GPL-2.0 <<
2 # Objects to go into the VDSO. 1 # Objects to go into the VDSO.
3 !! 2 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 3
10 # Common compiler flags between ABIs. 4 # Common compiler flags between ABIs.
11 ccflags-vdso := \ 5 ccflags-vdso := \
12 $(filter -I%,$(KBUILD_CFLAGS)) \ 6 $(filter -I%,$(KBUILD_CFLAGS)) \
13 $(filter -E%,$(KBUILD_CFLAGS)) \ 7 $(filter -E%,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ !! 8 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ !! 9 $(filter -march=%,$(KBUILD_CFLAGS))
16 $(CLANG_FLAGS) \ <<
17 -D__VDSO__ <<
18 <<
19 cflags-vdso := $(ccflags-vdso) \ 10 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% 11 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22 -O2 -g -fno-strict-aliasing -fno-commo !! 12 -O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
23 -fno-stack-protector -fno-jump-tables !! 13 -DDISABLE_BRANCH_PROFILING \
24 $(call cc-option, -fno-asynchronous-un 14 $(call cc-option, -fno-asynchronous-unwind-tables) \
25 $(call cc-option, -fno-stack-protector 15 $(call cc-option, -fno-stack-protector)
26 aflags-vdso := $(ccflags-vdso) \ 16 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 17 -D__ASSEMBLY__ -Wa,-gdwarf-2
28 18
29 ifneq ($(c-gettimeofday-y),) !! 19 #
30 CFLAGS_vgettimeofday.o += -include $(c-getti !! 20 # For the pre-R6 code in arch/mips/vdso/vdso.h for locating
31 endif !! 21 # the base address of VDSO, the linker will emit a R_MIPS_PC32
32 !! 22 # relocation in binutils > 2.25 but it will fail with older versions
33 ifneq ($(c-getrandom-y),) !! 23 # because that relocation is not supported for that symbol. As a result
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 24 # of which we are forced to disable the VDSO symbols when building
>> 25 # with < 2.25 binutils on pre-R6 kernels. For more references on why we
>> 26 # can't use other methods to get the base address of VDSO please refer to
>> 27 # the comments on that file.
>> 28 #
>> 29 ifndef CONFIG_CPU_MIPSR6
>> 30 ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
>> 31 $(warning MIPS VDSO requires binutils >= 2.25)
>> 32 obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
>> 33 ccflags-vdso += -DDISABLE_MIPS_VDSO
>> 34 endif
35 endif 35 endif
36 36
37 # VDSO linker flags. 37 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname !! 38 VDSO_LDFLAGS := \
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl !! 39 -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
40 --hash-style=sysv --build-id -T !! 40 -nostdlib -shared \
>> 41 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
>> 42 $(call cc-ldoption, -Wl$(comma)--build-id)
>> 43
>> 44 GCOV_PROFILE := n
41 45
42 # 46 #
43 # Shared build commands. 47 # Shared build commands.
44 # 48 #
45 49
46 quiet_cmd_vdsold_and_vdso_check = LD $@ !! 50 quiet_cmd_vdsold = VDSO $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 51 cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
>> 52 -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
48 53
49 quiet_cmd_vdsoas_o_S = AS $@ 54 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 55 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
51 56
52 # Generate VDSO offsets using helper script !! 57 # Strip rule for the raw .so files
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 58 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
54 quiet_cmd_vdsosym = VDSOSYM $@ !! 59 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) !! 60 $(call if_changed,objcopy)
56 61
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 62 hostprogs-y := genvdso
58 $(call if_changed,vdsosym) !! 63
>> 64 quiet_cmd_genvdso = GENVDSO $@
>> 65 define cmd_genvdso
>> 66 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 67 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 68 endef
59 69
60 # 70 #
61 # Build native VDSO. 71 # Build native VDSO.
62 # 72 #
63 73
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 74 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
65 75
66 targets += $(obj-vdso-y) 76 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so !! 77 targets += vdso.lds
>> 78 targets += vdso.so.dbg.raw vdso.so.raw
>> 79 targets += vdso.so.dbg vdso.so
>> 80 targets += vdso-image.c
68 81
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 82 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70 83
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 84 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 85 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
73 86
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 87 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
75 88
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 89 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_chec !! 90 $(call if_changed,vdsold)
78 91
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 92 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 93 $(obj)/genvdso FORCE
81 $(call if_changed,objcopy) !! 94 $(call if_changed,genvdso)
>> 95
>> 96 obj-y += vdso-image.o
>> 97
>> 98 #
>> 99 # Build O32 VDSO.
>> 100 #
>> 101
>> 102 # Define these outside the ifdef to ensure they are picked up by clean.
>> 103 targets += $(obj-vdso-y:%.o=%-o32.o)
>> 104 targets += vdso-o32.lds
>> 105 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
>> 106 targets += vdso-o32.so.dbg vdso-o32.so
>> 107 targets += vdso-o32-image.c
>> 108
>> 109 ifdef CONFIG_MIPS32_O32
>> 110
>> 111 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
>> 112
>> 113 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
>> 114 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
>> 115
>> 116 $(obj)/%-o32.o: $(src)/%.S FORCE
>> 117 $(call if_changed_dep,vdsoas_o_S)
>> 118
>> 119 $(obj)/%-o32.o: $(src)/%.c FORCE
>> 120 $(call cmd,force_checksrc)
>> 121 $(call if_changed_rule,cc_o_c)
82 122
83 obj-y += vdso.o !! 123 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
>> 124 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
>> 125 $(call if_changed_dep,cpp_lds_S)
>> 126
>> 127 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
>> 128 $(call if_changed,vdsold)
>> 129
>> 130 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
>> 131 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
>> 132 $(obj)/genvdso FORCE
>> 133 $(call if_changed,genvdso)
>> 134
>> 135 obj-y += vdso-o32-image.o
>> 136
>> 137 endif
>> 138
>> 139 #
>> 140 # Build N32 VDSO.
>> 141 #
>> 142
>> 143 targets += $(obj-vdso-y:%.o=%-n32.o)
>> 144 targets += vdso-n32.lds
>> 145 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
>> 146 targets += vdso-n32.so.dbg vdso-n32.so
>> 147 targets += vdso-n32-image.c
>> 148
>> 149 ifdef CONFIG_MIPS32_N32
>> 150
>> 151 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
>> 152
>> 153 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
>> 154 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
>> 155
>> 156 $(obj)/%-n32.o: $(src)/%.S FORCE
>> 157 $(call if_changed_dep,vdsoas_o_S)
>> 158
>> 159 $(obj)/%-n32.o: $(src)/%.c FORCE
>> 160 $(call cmd,force_checksrc)
>> 161 $(call if_changed_rule,cc_o_c)
>> 162
>> 163 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
>> 164 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
>> 165 $(call if_changed_dep,cpp_lds_S)
>> 166
>> 167 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
>> 168 $(call if_changed,vdsold)
>> 169
>> 170 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
>> 171 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
>> 172 $(obj)/genvdso FORCE
>> 173 $(call if_changed,genvdso)
>> 174
>> 175 obj-y += vdso-n32-image.o
>> 176
>> 177 endif
84 178
85 $(obj)/vdso.o : $(obj)/vdso.so !! 179 # FIXME: Need install rule for debug.
>> 180 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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