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TOMOYO Linux Cross Reference
Linux/arch/mips/vdso/Makefile

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  1 # SPDX-License-Identifier: GPL-2.0
  2 # Objects to go into the VDSO.
  3 
  4 # Include the generic Makefile to check the built vdso.
  5 include $(srctree)/lib/vdso/Makefile
  6 
  7 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
  8 
  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__
 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.
 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
 46 
 47 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
 48 
 49 ifdef CONFIG_MIPS_DISABLE_VDSO
 50   obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
 51 endif
 52 
 53 # VDSO linker flags.
 54 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
 55         $(filter -E%,$(KBUILD_CFLAGS)) -shared \
 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
 65 
 66 #
 67 # Shared build commands.
 68 #
 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 
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
197 
198 # FIXME: Need install rule for debug.
199 # Needs to deal with dependency for generation of dbg by cmd_genvdso...

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