# SPDX-License-Identifier: GPL-2.0-only
|
# Copied from arch/tile/kernel/vdso/Makefile
|
|
# 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 vdso
|
vdso-syms = rt_sigreturn
|
ifdef CONFIG_64BIT
|
vdso-syms += vgettimeofday
|
endif
|
vdso-syms += getcpu
|
vdso-syms += flush_icache
|
|
# Files to link into the vdso
|
obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
|
|
ccflags-y := -fno-stack-protector
|
ccflags-y += -DDISABLE_BRANCH_PROFILING
|
|
ifneq ($(c-gettimeofday-y),)
|
CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
|
endif
|
|
# Build rules
|
targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-syms.S
|
obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
|
|
obj-y += vdso.o vdso-syms.o
|
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
|
ifneq ($(filter vgettimeofday, $(vdso-syms)),)
|
CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY
|
endif
|
|
# Disable -pg to prevent insert call site
|
CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
|
|
# Disable profiling and instrumentation for VDSO code
|
GCOV_PROFILE := n
|
KCOV_INSTRUMENT := n
|
KASAN_SANITIZE := n
|
|
# Force dependency
|
$(obj)/vdso.o: $(obj)/vdso.so
|
|
# link rule for the .so file, .lds has to be first
|
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
|
$(call if_changed,vdsold)
|
LDFLAGS_vdso.so.dbg = -shared -s -soname=linux-vdso.so.1 \
|
--build-id=sha1 --hash-style=both --eh-frame-hdr
|
|
# We also create a special relocatable object that should mirror the symbol
|
# table and layout of the linked DSO. With ld --just-symbols we can then
|
# refer to these symbols in the kernel code rather than hand-coded addresses.
|
$(obj)/vdso-syms.S: $(obj)/vdso.so FORCE
|
$(call if_changed,so2s)
|
|
# strip rule for the .so file
|
$(obj)/%.so: OBJCOPYFLAGS := -S
|
$(obj)/%.so: $(obj)/%.so.dbg FORCE
|
$(call if_changed,objcopy)
|
|
# actual build commands
|
# The DSO images are built using a special linker script
|
# Make sure only to export the intended __vdso_xxx symbol offsets.
|
quiet_cmd_vdsold = VDSOLD $@
|
cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
|
$(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \
|
rm $@.tmp
|
|
# Extracts symbol offsets from the VDSO, converting them into an assembly file
|
# that contains the same symbols at the same offsets.
|
quiet_cmd_so2s = SO2S $@
|
cmd_so2s = $(NM) -D $< | $(srctree)/$(src)/so2s.sh > $@
|
|
# install commands for the unstripped file
|
quiet_cmd_vdso_install = INSTALL $@
|
cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
|
|
vdso.so: $(obj)/vdso.so.dbg
|
@mkdir -p $(MODLIB)/vdso
|
$(call cmd,vdso_install)
|
|
vdso_install: vdso.so
|
