80 lines
2.0 KiB
Makefile
80 lines
2.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
|
|
#
|
|
# Building a vDSO image for AArch64.
|
|
#
|
|
# Author: Will Deacon <will.deacon@arm.com>
|
|
# Heavily based on the vDSO Makefiles for other archs.
|
|
#
|
|
|
|
obj-vdso := note.o datapage.o sigreturn.o gettimeofday.o
|
|
|
|
# Build rules
|
|
targets := $(obj-vdso) vdso.so vdso.so.dbg
|
|
obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
|
|
|
|
ccflags-y := -shared -fno-common -fno-builtin -nostdlib -fPIC -Wl,-shared -g \
|
|
-Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv
|
|
|
|
# Disable gcov profiling for VDSO code
|
|
GCOV_PROFILE := n
|
|
|
|
|
|
obj-y += vdso.o
|
|
extra-y += vdso.lds
|
|
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
|
|
|
|
# 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)
|
|
|
|
|
|
# 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-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
|
|
quiet_cmd_vdsosym = VDSOSYM $@
|
|
cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
|
|
|
|
include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
|
|
$(call if_changed,vdsosym)
|
|
|
|
|
|
|
|
# Assembly rules for the .S files
|
|
|
|
sigreturn.o : sigreturn.S
|
|
$(call if_changed_dep,vdsoas)
|
|
|
|
note.o : note.S
|
|
$(call if_changed_dep,vdsoas)
|
|
|
|
datapage.o : datapage.S
|
|
$(call if_changed_dep,vdsoas)
|
|
|
|
gettimeofday.o : gettimeofday.c FORCE
|
|
$(call if_changed_dep,vdsocc)
|
|
|
|
# Actual build commands
|
|
quiet_cmd_vdsold = VDSOL $@
|
|
cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $(real-prereqs) -o $@
|
|
quiet_cmd_vdsoas = VDSOA $@
|
|
cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
|
|
quiet_cmd_vdsocc = VDSOA $@
|
|
cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $<
|
|
|
|
# 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
|