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- # SPDX-License-Identifier: GPL-2.0-only
- # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
- # the inclusion of generic Makefile.
- ARCH_REL_TYPE_ABS := R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT
- include $(srctree)/lib/vdso/Makefile
- # Symbols present in the compat_vdso
- compat_vdso-syms = rt_sigreturn
- compat_vdso-syms += getcpu
- compat_vdso-syms += flush_icache
- # Files to link into the compat_vdso
- obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o
- ccflags-y := -fno-stack-protector
- # Build rules
- targets := $(obj-compat_vdso) compat_vdso.so compat_vdso.so.dbg compat_vdso.lds
- obj-compat_vdso := $(addprefix $(obj)/, $(obj-compat_vdso))
- obj-y += compat_vdso.o
- CPPFLAGS_compat_vdso.lds += -P -C -U$(ARCH)
- # Disable profiling and instrumentation for VDSO code
- GCOV_PROFILE := n
- KCOV_INSTRUMENT := n
- # Force dependency
- $(obj)/compat_vdso.o: $(obj)/compat_vdso.so
- # link rule for the .so file, .lds has to be first
- $(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.lds $(obj-compat_vdso) FORCE
- $(call if_changed,compat_vdsold)
- LDFLAGS_compat_vdso.so.dbg = -shared -S -soname=linux-compat_vdso.so.1 \
- --build-id=sha1 --hash-style=both --eh-frame-hdr
- # strip rule for the .so file
- $(obj)/%.so: OBJCOPYFLAGS := -S
- $(obj)/%.so: $(obj)/%.so.dbg FORCE
- $(call if_changed,objcopy)
- # Generate VDSO offsets using helper script
- gen-compat_vdsosym := $(srctree)/$(src)/gen_compat_vdso_offsets.sh
- quiet_cmd_compat_vdsosym = VDSOSYM $@
- cmd_compat_vdsosym = $(NM) $< | $(gen-compat_vdsosym) | LC_ALL=C sort > $@
- include/generated/compat_vdso-offsets.h: $(obj)/compat_vdso.so.dbg FORCE
- $(call if_changed,compat_vdsosym)
- # actual build commands
- # The DSO images are built using a special linker script
- # Make sure only to export the intended __compat_vdso_xxx symbol offsets.
- quiet_cmd_compat_vdsold = VDSOLD $@
- cmd_compat_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
- $(OBJCOPY) $(patsubst %, -G __compat_vdso_%, $(compat_vdso-syms)) $@.tmp $@ && \
- rm $@.tmp
- # install commands for the unstripped file
- quiet_cmd_compat_vdso_install = INSTALL $@
- cmd_compat_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/compat_vdso/$@
- compat_vdso.so: $(obj)/compat_vdso.so.dbg
- @mkdir -p $(MODLIB)/compat_vdso
- $(call cmd,compat_vdso_install)
- compat_vdso_install: compat_vdso.so
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