| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # Building a vDSO image for AArch64. |
| # |
| # Author: Will Deacon <will.deacon@arm.com> |
| # Heavily based on the vDSO Makefiles for other archs. |
| # |
| |
| obj-vdso := gettimeofday.o note.o sigreturn.o |
| |
| # Build rules |
| targets := $(obj-vdso) vdso.so vdso.so.dbg |
| obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) |
| |
| ccflags-y := -shared -fno-common -fno-builtin |
| ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \ |
| $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) |
| |
| # Disable gcov profiling for VDSO code |
| GCOV_PROFILE := n |
| |
| # Workaround for bare-metal (ELF) toolchains that neglect to pass -shared |
| # down to collect2, resulting in silent corruption of the vDSO image. |
| ccflags-y += -Wl,-shared |
| |
| obj-y += vdso.o |
| extra-y += vdso.lds |
| CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
| |
| # Force dependency (incbin is bad) |
| $(obj)/vdso.o : $(obj)/vdso.so |
| |
| # Link rule for the .so file, .lds has to be first |
| $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) |
| $(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 $@ |
| define cmd_vdsosym |
| $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ |
| endef |
| |
| include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE |
| $(call if_changed,vdsosym) |
| |
| # Assembly rules for the .S files |
| $(obj-vdso): %.o: %.S FORCE |
| $(call if_changed_dep,vdsoas) |
| |
| # Actual build commands |
| quiet_cmd_vdsold = VDSOL $@ |
| cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@ |
| quiet_cmd_vdsoas = VDSOA $@ |
| cmd_vdsoas = $(CC) $(a_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 |
