1 # SPDX-License-Identifier: GPL-2.0
2 # Objects to go into the VDSO.
4 # Sanitizer runtimes are unavailable and cannot be linked here.
7 # Include the generic Makefile to check the built vdso.
8 include $(srctree)/lib/vdso/Makefile
10 obj-vdso-y := elf.o vgettimeofday.o sigreturn.o
12 # Common compiler flags between ABIs.
14 $(filter -I%,$(KBUILD_CFLAGS)) \
15 $(filter -E%,$(KBUILD_CFLAGS)) \
16 $(filter -mmicromips,$(KBUILD_CFLAGS)) \
17 $(filter -march=%,$(KBUILD_CFLAGS)) \
18 $(filter -m%-float,$(KBUILD_CFLAGS)) \
19 $(filter -mno-loongson-%,$(KBUILD_CFLAGS)) \
24 ccflags-vdso += -DBUILD_VDSO32
28 # The -fno-jump-tables flag only prevents the compiler from generating
29 # jump tables but does not prevent the compiler from emitting absolute
31 cflags-vdso := $(ccflags-vdso) \
32 $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
33 -O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
34 -mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
35 -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
36 $(call cc-option, -fno-asynchronous-unwind-tables)
37 aflags-vdso := $(ccflags-vdso) \
38 -D__ASSEMBLY__ -Wa,-gdwarf-2
40 ifneq ($(c-gettimeofday-y),)
41 CFLAGS_vgettimeofday.o = -include $(c-gettimeofday-y)
43 # config-n32-o32-env.c prepares the environment to build a 32bit vDSO
44 # library on a 64bit kernel.
45 # Note: Needs to be included before than the generic library.
46 CFLAGS_vgettimeofday-o32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
47 CFLAGS_vgettimeofday-n32.o = -include $(srctree)/$(src)/config-n32-o32-env.c -include $(c-gettimeofday-y)
50 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
52 ifdef CONFIG_MIPS_DISABLE_VDSO
53 obj-vdso-y := $(filter-out vgettimeofday.o, $(obj-vdso-y))
57 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
58 $(filter -E%,$(KBUILD_CFLAGS)) -shared \
59 -G 0 --eh-frame-hdr --hash-style=sysv --build-id=sha1 -T
61 CFLAGS_REMOVE_vdso.o = $(CC_FLAGS_FTRACE)
67 # Check that we don't have PIC 'jalr t9' calls left
68 quiet_cmd_vdso_mips_check = VDSOCHK $@
69 cmd_vdso_mips_check = if $(OBJDUMP) --disassemble $@ | grep -E -h "jalr.*t9" > /dev/null; \
70 then (echo >&2 "$@: PIC 'jalr t9' calls are not supported"; \
71 rm -f $@; /bin/false); fi
74 # Shared build commands.
77 quiet_cmd_vdsold_and_vdso_check = LD $@
78 cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
80 quiet_cmd_vdsoas_o_S = AS $@
81 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
83 # Strip rule for the raw .so files
84 $(obj)/%.so.raw: OBJCOPYFLAGS := -S
85 $(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
86 $(call if_changed,objcopy)
90 quiet_cmd_genvdso = GENVDSO $@
92 $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
93 $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
100 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
102 targets += $(obj-vdso-y)
104 targets += vdso.so.dbg.raw vdso.so.raw
105 targets += vdso.so.dbg vdso.so
106 targets += vdso-image.c
108 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
110 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
111 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
113 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
115 $(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
116 $(call if_changed,vdsold_and_vdso_check)
118 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
120 $(call if_changed,genvdso)
122 obj-y += vdso-image.o
128 # Define these outside the ifdef to ensure they are picked up by clean.
129 targets += $(obj-vdso-y:%.o=%-o32.o)
130 targets += vdso-o32.lds
131 targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
132 targets += vdso-o32.so.dbg vdso-o32.so
133 targets += vdso-o32-image.c
135 ifdef CONFIG_MIPS32_O32
137 obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
139 $(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
140 $(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
142 $(obj)/%-o32.o: $(src)/%.S FORCE
143 $(call if_changed_dep,vdsoas_o_S)
145 $(obj)/%-o32.o: $(src)/%.c FORCE
146 $(call cmd,force_checksrc)
147 $(call if_changed_rule,cc_o_c)
149 $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
150 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
151 $(call if_changed_dep,cpp_lds_S)
153 $(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
154 $(call if_changed,vdsold_and_vdso_check)
156 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
157 $(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
159 $(call if_changed,genvdso)
161 obj-y += vdso-o32-image.o
169 targets += $(obj-vdso-y:%.o=%-n32.o)
170 targets += vdso-n32.lds
171 targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
172 targets += vdso-n32.so.dbg vdso-n32.so
173 targets += vdso-n32-image.c
175 ifdef CONFIG_MIPS32_N32
177 obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
179 $(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
180 $(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
182 $(obj)/%-n32.o: $(src)/%.S FORCE
183 $(call if_changed_dep,vdsoas_o_S)
185 $(obj)/%-n32.o: $(src)/%.c FORCE
186 $(call cmd,force_checksrc)
187 $(call if_changed_rule,cc_o_c)
189 $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
190 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
191 $(call if_changed_dep,cpp_lds_S)
193 $(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
194 $(call if_changed,vdsold_and_vdso_check)
196 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
197 $(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
199 $(call if_changed,genvdso)
201 obj-y += vdso-n32-image.o
205 # FIXME: Need install rule for debug.
206 # Needs to deal with dependency for generation of dbg by cmd_genvdso...