arch/loongarch/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3
   4 # Include the generic Makefile to check the built vdso.
   5 include $(srctree)/lib/vdso/Makefile
   6
   7 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o vgetrandom.o \
   8               vgetrandom-chacha.o sigreturn.o
   9
  10 # Common compiler flags between ABIs.
  11 ccflags-vdso := \
  12         $(filter -I%,$(KBUILD_CFLAGS)) \
  13         $(filter -E%,$(KBUILD_CFLAGS)) \
  14         $(filter -march=%,$(KBUILD_CFLAGS)) \
  15         $(filter -m%-float,$(KBUILD_CFLAGS)) \
  16         $(CLANG_FLAGS) \
  17         -D__VDSO__
  18
  19 cflags-vdso := $(ccflags-vdso) \
  20         -isystem $(shell $(CC) -print-file-name=include) \
  21         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  22         -std=gnu11 -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
  23         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  24         $(call cc-option, -fno-asynchronous-unwind-tables) \
  25         $(call cc-option, -fno-stack-protector)
  26 aflags-vdso := $(ccflags-vdso) \
  27         -D__ASSEMBLY__ -Wa,-gdwarf-2
  28
  29 ifneq ($(c-gettimeofday-y),)
  30   CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
  31 endif
  32
  33 ifneq ($(c-getrandom-y),)
  34   CFLAGS_vgetrandom.o += -include $(c-getrandom-y)
  35 endif
  36
  37 # VDSO linker flags.
  38 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  39         $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
  40         --hash-style=sysv --build-id -T
  41
  42 #
  43 # Shared build commands.
  44 #
  45
  46 quiet_cmd_vdsold_and_vdso_check = LD      $@
  47       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
  48
  49 quiet_cmd_vdsoas_o_S = AS       $@
  50       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  51
  52 # Generate VDSO offsets using helper script
  53 gen-vdsosym := $(src)/gen_vdso_offsets.sh
  54 quiet_cmd_vdsosym = VDSOSYM $@
  55       cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
  56
  57 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
  58         $(call if_changed,vdsosym)
  59
  60 #
  61 # Build native VDSO.
  62 #
  63
  64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  65
  66 targets += $(obj-vdso-y)
  67 targets += vdso.lds vdso.so.dbg vdso.so
  68
  69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  70
  71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  73
  74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  75
  76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
  77         $(call if_changed,vdsold_and_vdso_check)
  78
  79 $(obj)/vdso.so: OBJCOPYFLAGS := -S
  80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
  81         $(call if_changed,objcopy)
  82
  83 obj-y += vdso.o
  84
  85 $(obj)/vdso.o : $(obj)/vdso.so