1# SPDX-License-Identifier: GPL-2.0
  2# Objects to go into the VDSO.
  3
  4# Sanitizer runtimes are unavailable and cannot be linked here.
  5 KCSAN_SANITIZE			:= n
  6
  7# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
  8# the inclusion of generic Makefile.
  9ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
 10include $(srctree)/lib/vdso/Makefile
 11
 12obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
 13
 14# Common compiler flags between ABIs.
 15ccflags-vdso := \
 16	$(filter -I%,$(KBUILD_CFLAGS)) \
 17	$(filter -E%,$(KBUILD_CFLAGS)) \
 18	$(filter -mmicromips,$(KBUILD_CFLAGS)) \
 19	$(filter -march=%,$(KBUILD_CFLAGS)) \
 20	$(filter -m%-float,$(KBUILD_CFLAGS)) \
 21	$(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
 22	$(CLANG_FLAGS) \
 23	-D__VDSO__
 24
 25ifndef CONFIG_64BIT
 26ccflags-vdso += -DBUILD_VDSO32
 27endif
 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.
 33cflags-vdso := $(ccflags-vdso) \
 34	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
 35	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
 36	-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
 37	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
 38	$(call cc-option, -fno-asynchronous-unwind-tables)
 39aflags-vdso := $(ccflags-vdso) \
 40	-D__ASSEMBLY__ -Wa,-gdwarf-2
 41
 42ifneq ($(c-gettimeofday-y),)
 43CFLAGS_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.
 48CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
 49CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
 50endif
 51
 52CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
 53
 54ifdef 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))
 59endif
 60
 61# VDSO linker flags.
 62ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
 63	$(filter -E%,$(KBUILD_CFLAGS)) -shared \
 64	-G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
 65
 66CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
 67
 68GCOV_PROFILE := n
 69UBSAN_SANITIZE := n
 70KCOV_INSTRUMENT := n
 71
 72# Check that we don't have PIC 'jalr t9' calls left
 73quiet_cmd_vdso_mips_check = VDSOCHK $@
 74      cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \
 75		       then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
 76			     rm -f $@; /bin/false); fi
 77
 78#
 79# Shared build commands.
 80#
 81
 82quiet_cmd_vdsold_and_vdso_check = LD      $@
 83      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
 84
 85quiet_cmd_vdsoas_o_S = AS      $@
 86      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
 87
 88# Strip rule for the raw .so files
 89$(obj)/%.so.raw: OBJCOPYFLAGS := -S
 90$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
 91	$(call if_changed,objcopy)
 92
 93hostprogs := genvdso
 94
 95quiet_cmd_genvdso = GENVDSO $@
 96define cmd_genvdso
 97	$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
 98	$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
 99endef
100
101#
102# Build native VDSO.
103#
104
105native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
106
107targets += $(obj-vdso-y)
108targets += vdso.lds
109targets += vdso.so.dbg.raw vdso.so.raw
110targets += vdso.so.dbg vdso.so
111targets += vdso-image.c
112
113obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
114
115$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
116$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
117
118$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
119
120$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
121	$(call if_changed,vdsold_and_vdso_check)
122
123$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
124                     $(obj)/genvdso FORCE
125	$(call if_changed,genvdso)
126
127obj-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.
134targets += $(obj-vdso-y:%.o=%-o32.o)
135targets += vdso-o32.lds
136targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
137targets += vdso-o32.so.dbg vdso-o32.so
138targets += vdso-o32-image.c
139
140ifdef CONFIG_MIPS32_O32
141
142obj-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	$(call if_changed_rule,cc_o_c)
153
154$(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
166obj-y += vdso-o32-image.o
167
168endif
169
170#
171# Build N32 VDSO.
172#
173
174targets += $(obj-vdso-y:%.o=%-n32.o)
175targets += vdso-n32.lds
176targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
177targets += vdso-n32.so.dbg vdso-n32.so
178targets += vdso-n32-image.c
179
180ifdef CONFIG_MIPS32_N32
181
182obj-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
206obj-y += vdso-n32-image.o
207
208endif
209
210# FIXME: Need install rule for debug.
211# Needs to deal with dependency for generation of dbg by cmd_genvdso...