arch/loongarch/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3
   4 KCOV_INSTRUMENT := n
   5
   6 # Include the generic Makefile to check the built vdso.
   7 include $(srctree)/lib/vdso/Makefile
   8
   9 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o
  10
  11 # Common compiler flags between ABIs.
  12 ccflags-vdso := \
  13         $(filter -I%,$(KBUILD_CFLAGS)) \
  14         $(filter -E%,$(KBUILD_CFLAGS)) \
  15         $(filter -march=%,$(KBUILD_CFLAGS)) \
  16         $(filter -m%-float,$(KBUILD_CFLAGS)) \
  17         $(CLANG_FLAGS) \
  18         -D__VDSO__
  19
  20 cflags-vdso := $(ccflags-vdso) \
  21         -isystem $(shell $(CC) -print-file-name=include) \
  22         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  23         -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
  24         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  25         $(call cc-option, -fno-asynchronous-unwind-tables) \
  26         $(call cc-option, -fno-stack-protector)
  27 aflags-vdso := $(ccflags-vdso) \
  28         -D__ASSEMBLY__ -Wa,-gdwarf-2
  29
  30 ifneq ($(c-gettimeofday-y),)
  31   CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
  32 endif
  33
  34 # VDSO linker flags.
  35 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  36         $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
  37         --hash-style=sysv --build-id -T
  38
  39 GCOV_PROFILE := n
  40
  41 #
  42 # Shared build commands.
  43 #
  44
  45 quiet_cmd_vdsold_and_vdso_check = LD      $@
  46       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
  47
  48 quiet_cmd_vdsoas_o_S = AS       $@
  49       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  50
  51 # Generate VDSO offsets using helper script
  52 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
  53 quiet_cmd_vdsosym = VDSOSYM $@
  54       cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
  55
  56 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
  57         $(call if_changed,vdsosym)
  58
  59 #
  60 # Build native VDSO.
  61 #
  62
  63 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  64
  65 targets += $(obj-vdso-y)
  66 targets += vdso.lds vdso.so.dbg vdso.so
  67
  68 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  69
  70 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  71 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  72
  73 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  74
  75 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
  76         $(call if_changed,vdsold_and_vdso_check)
  77
  78 $(obj)/vdso.so: OBJCOPYFLAGS := -S
  79 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
  80         $(call if_changed,objcopy)
  81
  82 obj-y += vdso.o
  83
  84 $(obj)/vdso.o : $(obj)/vdso.so
  85
  86 # install commands for the unstripped file
  87 quiet_cmd_vdso_install = INSTALL $@
  88       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  89
  90 vdso.so: $(obj)/vdso.so.dbg
  91         @mkdir -p $(MODLIB)/vdso
  92         $(call cmd,vdso_install)
  93
  94 vdso_install: vdso.so