1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
>> 2 # Objects to go into the VDSO.
2 3
3 # Include the generic Makefile to check the bu 4 # Include the generic Makefile to check the built vdso.
4 include $(srctree)/lib/vdso/Makefile 5 include $(srctree)/lib/vdso/Makefile
5 6
6 hostprogs := vdsomunge !! 7 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
7 8
8 obj-vdso := vgettimeofday.o datapage.o note.o !! 9 # Common compiler flags between ABIs.
>> 10 ccflags-vdso := \
>> 11 $(filter -I%,$(KBUILD_CFLAGS)) \
>> 12 $(filter -E%,$(KBUILD_CFLAGS)) \
>> 13 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
>> 14 $(filter -march=%,$(KBUILD_CFLAGS)) \
>> 15 $(filter -m%-float,$(KBUILD_CFLAGS)) \
>> 16 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
>> 17 $(CLANG_FLAGS) \
>> 18 -D__VDSO__
9 19
10 # Build rules !! 20 ifndef CONFIG_64BIT
11 targets := $(obj-vdso) vdso.so vdso.so.dbg vds !! 21 ccflags-vdso += -DBUILD_VDSO32
12 obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) !! 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.
>> 28 cflags-vdso := $(ccflags-vdso) \
>> 29 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
>> 30 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
>> 31 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
>> 32 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
>> 33 $(call cc-option, -fno-asynchronous-unwind-tables)
>> 34 aflags-vdso := $(ccflags-vdso) \
>> 35 -D__ASSEMBLY__ -Wa,-gdwarf-2
>> 36
>> 37 ifneq ($(c-gettimeofday-y),)
>> 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)
>> 45 endif
13 46
14 ccflags-y := -fPIC -fno-common -fno-builtin -f !! 47 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
15 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUIL <<
16 48
17 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 !! 49 ifdef CONFIG_MIPS_DISABLE_VDSO
>> 50 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
>> 51 endif
>> 52
>> 53 # VDSO linker flags.
18 ldflags-y := -Bsymbolic --no-undefined -soname 54 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
19 -z max-page-size=4096 -shared $(ld !! 55 $(filter -E%,$(KBUILD_CFLAGS)) -shared \
20 --hash-style=sysv --build-id=sha1 !! 56 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
21 -T !! 57
22 !! 58 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
23 obj-$(CONFIG_VDSO) += vdso.o !! 59
24 CPPFLAGS_vdso.lds += -P -C -U$(ARCH) !! 60 # Check that we don't have PIC 'jalr t9' calls left
25 !! 61 quiet_cmd_vdso_mips_check = VDSOCHK $@
26 CFLAGS_REMOVE_vdso.o = -pg !! 62 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \
27 !! 63 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
28 # Force -O2 to avoid libgcc dependencies !! 64 rm -f $@; /bin/false); fi
29 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RAND !! 65
30 ifeq ($(c-gettimeofday-y),) !! 66 #
31 CFLAGS_vgettimeofday.o = -O2 !! 67 # Shared build commands.
32 else !! 68 #
33 CFLAGS_vgettimeofday.o = -O2 -include $(c-gett !! 69
>> 70 quiet_cmd_vdsold_and_vdso_check = LD $@
>> 71 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
>> 72
>> 73 quiet_cmd_vdsoas_o_S = AS $@
>> 74 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
>> 75
>> 76 # Strip rule for the raw .so files
>> 77 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
>> 78 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
>> 79 $(call if_changed,objcopy)
>> 80
>> 81 hostprogs := genvdso
>> 82
>> 83 quiet_cmd_genvdso = GENVDSO $@
>> 84 define cmd_genvdso
>> 85 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
>> 86 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
>> 87 endef
>> 88
>> 89 #
>> 90 # Build native VDSO.
>> 91 #
>> 92
>> 93 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
>> 94
>> 95 targets += $(obj-vdso-y)
>> 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
>> 100
>> 101 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
>> 102
>> 103 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
>> 104 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
>> 105
>> 106 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
>> 107
>> 108 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
>> 109 $(call if_changed,vdsold_and_vdso_check)
>> 110
>> 111 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
>> 112 $(obj)/genvdso FORCE
>> 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)
>> 145
>> 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
34 endif 156 endif
35 157
36 # Force dependency !! 158 #
37 $(obj)/vdso.o : $(obj)/vdso.so !! 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)
38 177
39 # Link rule for the .so file !! 178 $(obj)/%-n32.o: $(src)/%.c FORCE
40 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso !! 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
41 $(call if_changed,vdsold_and_vdso_chec 187 $(call if_changed,vdsold_and_vdso_check)
42 188
43 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/ !! 189 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
44 $(call if_changed,vdsomunge) !! 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)
45 193
46 # Strip rule for the .so file !! 194 obj-y += vdso-n32-image.o
47 $(obj)/%.so: OBJCOPYFLAGS := -S <<
48 $(obj)/%.so: $(obj)/%.so.dbg FORCE <<
49 $(call if_changed,objcopy) <<
50 195
51 # Actual build commands !! 196 endif
52 quiet_cmd_vdsold_and_vdso_check = LD $@ <<
53 cmd_vdsold_and_vdso_check = $(cmd_ld); $ <<
54 197
55 quiet_cmd_vdsomunge = MUNGE $@ !! 198 # FIXME: Need install rule for debug.
56 cmd_vdsomunge = $(objtree)/$(obj)/vdsomu !! 199 # Needs to deal with dependency for generation of dbg by cmd_genvdso...
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