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 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
>> 5 # the inclusion of generic Makefile.
>> 6 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
5 include $(srctree)/lib/vdso/Makefile 7 include $(srctree)/lib/vdso/Makefile
6 8
7 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o !! 9 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
8 vgetrandom-chacha.o sigreturn.o <<
9 10
10 # Common compiler flags between ABIs. 11 # Common compiler flags between ABIs.
11 ccflags-vdso := \ 12 ccflags-vdso := \
12 $(filter -I%,$(KBUILD_CFLAGS)) \ 13 $(filter -I%,$(KBUILD_CFLAGS)) \
13 $(filter -E%,$(KBUILD_CFLAGS)) \ 14 $(filter -E%,$(KBUILD_CFLAGS)) \
>> 15 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ 16 $(filter -march=%,$(KBUILD_CFLAGS)) \
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ 17 $(filter -m%-float,$(KBUILD_CFLAGS)) \
16 $(CLANG_FLAGS) \ !! 18 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
17 -D__VDSO__ 19 -D__VDSO__
18 20
>> 21 ifndef CONFIG_64BIT
>> 22 ccflags-vdso += -DBUILD_VDSO32
>> 23 endif
>> 24
>> 25 ifdef CONFIG_CC_IS_CLANG
>> 26 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
>> 27 endif
>> 28
>> 29 #
>> 30 # The -fno-jump-tables flag only prevents the compiler from generating
>> 31 # jump tables but does not prevent the compiler from emitting absolute
>> 32 # offsets.
19 cflags-vdso := $(ccflags-vdso) \ 33 cflags-vdso := $(ccflags-vdso) \
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% 34 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
22 -O2 -g -fno-strict-aliasing -fno-commo !! 35 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
>> 36 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
23 -fno-stack-protector -fno-jump-tables 37 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
24 $(call cc-option, -fno-asynchronous-un !! 38 $(call cc-option, -fno-asynchronous-unwind-tables)
25 $(call cc-option, -fno-stack-protector <<
26 aflags-vdso := $(ccflags-vdso) \ 39 aflags-vdso := $(ccflags-vdso) \
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 40 -D__ASSEMBLY__ -Wa,-gdwarf-2
28 41
29 ifneq ($(c-gettimeofday-y),) 42 ifneq ($(c-gettimeofday-y),)
30 CFLAGS_vgettimeofday.o += -include $(c-getti !! 43 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
>> 44
>> 45 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
>> 46 # library on a 64bit kernel.
>> 47 # Note: Needs to be included before than the generic library.
>> 48 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
>> 49 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
31 endif 50 endif
32 51
33 ifneq ($(c-getrandom-y),) !! 52 CFLAGS_REMOVE_vgettimeofday.o = -pg
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 53
>> 54 ifdef CONFIG_MIPS_DISABLE_VDSO
>> 55 ifndef CONFIG_MIPS_LD_CAN_LINK_VDSO
>> 56 $(warning MIPS VDSO requires binutils >= 2.25)
>> 57 endif
>> 58 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
35 endif 59 endif
36 60
37 # VDSO linker flags. 61 # VDSO linker flags.
38 ldflags-y := -Bsymbolic --no-undefined -soname 62 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl 63 $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
40 --hash-style=sysv --build-id -T !! 64 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
>> 65
>> 66 CFLAGS_REMOVE_vdso.o = -pg
>> 67
>> 68 GCOV_PROFILE := n
>> 69 UBSAN_SANITIZE := n
>> 70 KCOV_INSTRUMENT := n
>> 71
>> 72 # Check that we don't have PIC 'jalr t9' calls left
>> 73 quiet_cmd_vdso_mips_check = VDSOCHK $@
>> 74 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | egrep -h "jalr.*t9" > /dev/null; \
>> 75 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
>> 76 rm -f $@; /bin/false); fi
41 77
42 # 78 #
43 # Shared build commands. 79 # Shared build commands.
44 # 80 #
45 81
46 quiet_cmd_vdsold_and_vdso_check = LD $@ 82 quiet_cmd_vdsold_and_vdso_check = LD $@
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 83 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
48 84
49 quiet_cmd_vdsoas_o_S = AS $@ !! 85 quiet_cmd_vdsoas_o_S = AS $@
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o 86 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
51 87
52 # Generate VDSO offsets using helper script !! 88 # Strip rule for the raw .so files
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 89 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
54 quiet_cmd_vdsosym = VDSOSYM $@ !! 90 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) !! 91 $(call if_changed,objcopy)
>> 92
>> 93 hostprogs := genvdso
56 94
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 95 quiet_cmd_genvdso = GENVDSO $@
58 $(call if_changed,vdsosym) !! 96 define cmd_genvdso
>> 97 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 98 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 99 endef
59 100
60 # 101 #
61 # Build native VDSO. 102 # Build native VDSO.
62 # 103 #
63 104
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS 105 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
65 106
66 targets += $(obj-vdso-y) 107 targets += $(obj-vdso-y)
67 targets += vdso.lds vdso.so.dbg vdso.so !! 108 targets += vdso.lds
>> 109 targets += vdso.so.dbg.raw vdso.so.raw
>> 110 targets += vdso.so.dbg vdso.so
>> 111 targets += vdso-image.c
68 112
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) 113 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
70 114
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ 115 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ 116 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
73 117
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- 118 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
75 119
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 120 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
77 $(call if_changed,vdsold_and_vdso_chec 121 $(call if_changed,vdsold_and_vdso_check)
78 122
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 123 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 124 $(obj)/genvdso FORCE
81 $(call if_changed,objcopy) !! 125 $(call if_changed,genvdso)
>> 126
>> 127 obj-y += vdso-image.o
>> 128
>> 129 #
>> 130 # Build O32 VDSO.
>> 131 #
>> 132
>> 133 # Define these outside the ifdef to ensure they are picked up by clean.
>> 134 targets += $(obj-vdso-y:%.o=%-o32.o)
>> 135 targets += vdso-o32.lds
>> 136 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
>> 137 targets += vdso-o32.so.dbg vdso-o32.so
>> 138 targets += vdso-o32-image.c
>> 139
>> 140 ifdef CONFIG_MIPS32_O32
>> 141
>> 142 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
>> 143
>> 144 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
>> 145 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
>> 146
>> 147 $(obj)/%-o32.o: $(src)/%.S FORCE
>> 148 $(call if_changed_dep,vdsoas_o_S)
>> 149
>> 150 $(obj)/%-o32.o: $(src)/%.c FORCE
>> 151 $(call cmd,force_checksrc)
>> 152 $(call if_changed_rule,cc_o_c)
82 153
83 obj-y += vdso.o !! 154 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
>> 155 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
>> 156 $(call if_changed_dep,cpp_lds_S)
>> 157
>> 158 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
>> 159 $(call if_changed,vdsold_and_vdso_check)
>> 160
>> 161 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
>> 162 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
>> 163 $(obj)/genvdso FORCE
>> 164 $(call if_changed,genvdso)
>> 165
>> 166 obj-y += vdso-o32-image.o
>> 167
>> 168 endif
>> 169
>> 170 #
>> 171 # Build N32 VDSO.
>> 172 #
>> 173
>> 174 targets += $(obj-vdso-y:%.o=%-n32.o)
>> 175 targets += vdso-n32.lds
>> 176 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
>> 177 targets += vdso-n32.so.dbg vdso-n32.so
>> 178 targets += vdso-n32-image.c
>> 179
>> 180 ifdef CONFIG_MIPS32_N32
>> 181
>> 182 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
>> 183
>> 184 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
>> 185 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
>> 186
>> 187 $(obj)/%-n32.o: $(src)/%.S FORCE
>> 188 $(call if_changed_dep,vdsoas_o_S)
>> 189
>> 190 $(obj)/%-n32.o: $(src)/%.c FORCE
>> 191 $(call cmd,force_checksrc)
>> 192 $(call if_changed_rule,cc_o_c)
>> 193
>> 194 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
>> 195 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
>> 196 $(call if_changed_dep,cpp_lds_S)
>> 197
>> 198 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
>> 199 $(call if_changed,vdsold_and_vdso_check)
>> 200
>> 201 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
>> 202 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
>> 203 $(obj)/genvdso FORCE
>> 204 $(call if_changed,genvdso)
>> 205
>> 206 obj-y += vdso-n32-image.o
>> 207
>> 208 endif
84 209
85 $(obj)/vdso.o : $(obj)/vdso.so !! 210 # FIXME: Need install rule for debug.
>> 211 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.