arch/nds32/kernel/vdso/Makefile

   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
   9 obj-vdso := note.o datapage.o sigreturn.o gettimeofday.o
  10
  11 # Build rules
  12 targets := $(obj-vdso) vdso.so vdso.so.dbg
  13 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  14
  15 ccflags-y := -shared -fno-common -fno-builtin -nostdlib -fPIC -Wl,-shared -g \
  16         -Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv
  17
  18 # Disable gcov profiling for VDSO code
  19 GCOV_PROFILE := n
  20
  21
  22 obj-y += vdso.o
  23 targets += vdso.lds
  24 CPPFLAGS_vdso.lds += -P -C -U$(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
  40 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
  41 quiet_cmd_vdsosym = VDSOSYM $@
  42       cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
  43
  44 include/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
  51 sigreturn.o : sigreturn.S
  52         $(call if_changed_dep,vdsoas)
  53
  54 note.o : note.S
  55         $(call if_changed_dep,vdsoas)
  56
  57 datapage.o : datapage.S
  58         $(call if_changed_dep,vdsoas)
  59
  60 gettimeofday.o : gettimeofday.c FORCE
  61         $(call if_changed_dep,vdsocc)
  62
  63 # Actual build commands
  64 quiet_cmd_vdsold = VDSOL   $@
  65       cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $(real-prereqs) -o $@
  66 quiet_cmd_vdsoas = VDSOA   $@
  67       cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
  68 quiet_cmd_vdsocc = VDSOA   $@
  69       cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $<
  70
  71 # Install commands for the unstripped file
  72 quiet_cmd_vdso_install = INSTALL $@
  73       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  74
  75 vdso.so: $(obj)/vdso.so.dbg
  76         @mkdir -p $(MODLIB)/vdso
  77         $(call cmd,vdso_install)
  78
  79 vdso_install: vdso.so