linux/arch/arm64/kernel/vdso/Makefile
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   1#
   2# Building a vDSO image for AArch64.
   3#
   4# Author: Will Deacon <will.deacon@arm.com>
   5# Heavily based on the vDSO Makefiles for other archs.
   6#
   7
   8obj-vdso := gettimeofday.o note.o sigreturn.o
   9
  10# Build rules
  11targets := $(obj-vdso) vdso.so vdso.so.dbg
  12obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  13
  14ccflags-y := -shared -fno-common -fno-builtin
  15ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \
  16                $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
  17
  18obj-y += vdso.o
  19extra-y += vdso.lds vdso-offsets.h
  20CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  21
  22# Force dependency (incbin is bad)
  23$(obj)/vdso.o : $(obj)/vdso.so
  24
  25# Link rule for the .so file, .lds has to be first
  26$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso)
  27        $(call if_changed,vdsold)
  28
  29# Strip rule for the .so file
  30$(obj)/%.so: OBJCOPYFLAGS := -S
  31$(obj)/%.so: $(obj)/%.so.dbg FORCE
  32        $(call if_changed,objcopy)
  33
  34# Generate VDSO offsets using helper script
  35gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
  36quiet_cmd_vdsosym = VDSOSYM $@
  37define cmd_vdsosym
  38        $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ && \
  39        cp $@ include/generated/
  40endef
  41
  42$(obj)/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
  47        $(call if_changed_dep,vdsoas)
  48
  49# Actual build commands
  50quiet_cmd_vdsold = VDSOL $@
  51      cmd_vdsold = $(CC) $(c_flags) -Wl,-T $^ -o $@
  52quiet_cmd_vdsoas = VDSOA $@
  53      cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
  54
  55# Install commands for the unstripped file
  56quiet_cmd_vdso_install = INSTALL $@
  57      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  58
  59vdso.so: $(obj)/vdso.so.dbg
  60        @mkdir -p $(MODLIB)/vdso
  61        $(call cmd,vdso_install)
  62
  63vdso_install: vdso.so
  64