1# SPDX-License-Identifier: GPL-2.0 2# 3# Building a vDSO image for AArch64. 4# 5# Author: Will Deacon <will.deacon@arm.com> 6# Heavily based on the vDSO Makefiles for other archs. 7# 8 9obj-vdso := gettimeofday.o note.o sigreturn.o 10 11# Build rules 12targets := $(obj-vdso) vdso.so vdso.so.dbg 13obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 14 15ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ 16 --build-id -n -T 17 18# Disable gcov profiling for VDSO code 19GCOV_PROFILE := n 20 21obj-y += vdso.o 22extra-y += vdso.lds 23CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 24 25# Force dependency (incbin is bad) 26$(obj)/vdso.o : $(obj)/vdso.so 27 28# Link rule for the .so file, .lds has to be first 29$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 30 $(call if_changed,ld) 31 32# Strip rule for the .so file 33$(obj)/%.so: OBJCOPYFLAGS := -S 34$(obj)/%.so: $(obj)/%.so.dbg FORCE 35 $(call if_changed,objcopy) 36 37# Generate VDSO offsets using helper script 38gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 39quiet_cmd_vdsosym = VDSOSYM $@ 40 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 41 42include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 43 $(call if_changed,vdsosym) 44 45# Assembly rules for the .S files 46$(obj-vdso): %.o: %.S FORCE 47 $(call if_changed_dep,vdsoas) 48 49# Actual build commands 50quiet_cmd_vdsoas = VDSOA $@ 51 cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< 52 53# Install commands for the unstripped file 54quiet_cmd_vdso_install = INSTALL $@ 55 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 56 57vdso.so: $(obj)/vdso.so.dbg 58 @mkdir -p $(MODLIB)/vdso 59 $(call cmd,vdso_install) 60 61vdso_install: vdso.so 62