1# SPDX-License-Identifier: GPL-2.0-only 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 := note.o datapage.o sigreturn.o gettimeofday.o 10 11# Build rules 12targets := $(obj-vdso) vdso.so vdso.so.dbg 13obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 14 15ccflags-y := -shared -fno-common -fno-builtin -nostdlib -fPIC -Wl,-shared -g \ 16 -Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv 17 18# Disable gcov profiling for VDSO code 19GCOV_PROFILE := n 20 21 22obj-y += vdso.o 23extra-y += vdso.lds 24CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 25 26# Force dependency 27$(obj)/vdso.o : $(obj)/vdso.so 28 29# Link rule for the .so file, .lds has to be first 30$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE 31 $(call if_changed,vdsold) 32 33 34# Strip rule for the .so file 35$(obj)/%.so: OBJCOPYFLAGS := -S 36$(obj)/%.so: $(obj)/%.so.dbg FORCE 37 $(call if_changed,objcopy) 38 39# Generate VDSO offsets using helper script 40gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh 41quiet_cmd_vdsosym = VDSOSYM $@ 42 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ 43 44include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE 45 $(call if_changed,vdsosym) 46 47 48 49# Assembly rules for the .S files 50 51sigreturn.o : sigreturn.S 52 $(call if_changed_dep,vdsoas) 53 54note.o : note.S 55 $(call if_changed_dep,vdsoas) 56 57datapage.o : datapage.S 58 $(call if_changed_dep,vdsoas) 59 60gettimeofday.o : gettimeofday.c FORCE 61 $(call if_changed_dep,vdsocc) 62 63# Actual build commands 64quiet_cmd_vdsold = VDSOL $@ 65 cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $(real-prereqs) -o $@ 66quiet_cmd_vdsoas = VDSOA $@ 67 cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< 68quiet_cmd_vdsocc = VDSOA $@ 69 cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $< 70 71# Install commands for the unstripped file 72quiet_cmd_vdso_install = INSTALL $@ 73 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 74 75vdso.so: $(obj)/vdso.so.dbg 76 @mkdir -p $(MODLIB)/vdso 77 $(call cmd,vdso_install) 78 79vdso_install: vdso.so 80