arch/loongarch/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Objects to go into the VDSO.
   3
   4 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
   5 # the inclusion of generic Makefile.
   6 ARCH_REL_TYPE_ABS := R_LARCH_32|R_LARCH_64|R_LARCH_MARK_LA|R_LARCH_JUMP_SLOT
   7 include $(srctree)/lib/vdso/Makefile
   8
   9 obj-vdso-y := elf.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         -D__VDSO__
  18
  19 ifeq ($(cc-name),clang)
  20 ccflags-vdso += $(filter --target=%,$(KBUILD_CFLAGS))
  21 endif
  22
  23 cflags-vdso := $(ccflags-vdso) \
  24         $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
  25         -O2 -g -fno-strict-aliasing -fno-common -fno-builtin -G0 \
  26         -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
  27         $(call cc-option, -fno-asynchronous-unwind-tables) \
  28         $(call cc-option, -fno-stack-protector)
  29 aflags-vdso := $(ccflags-vdso) \
  30         -D__ASSEMBLY__ -Wa,-gdwarf-2
  31
  32 ifneq ($(c-gettimeofday-y),)
  33   CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
  34 endif
  35
  36 # VDSO linker flags.
  37 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  38         $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \
  39         --hash-style=sysv --build-id -T
  40
  41 GCOV_PROFILE := n
  42
  43 #
  44 # Shared build commands.
  45 #
  46
  47 quiet_cmd_vdsold_and_vdso_check = LD      $@
  48       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
  49
  50 quiet_cmd_vdsoas_o_S = AS       $@
  51       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
  52
  53 # Generate VDSO offsets using helper script
  54 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
  55 quiet_cmd_vdsosym = VDSOSYM $@
  56       cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
  57
  58 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
  59         $(call if_changed,vdsosym)
  60
  61 #
  62 # Build native VDSO.
  63 #
  64
  65 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
  66
  67 targets += $(obj-vdso-y)
  68 targets += vdso.lds vdso.so.dbg vdso.so
  69
  70 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
  71
  72 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
  73 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
  74
  75 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
  76
  77 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
  78         $(call if_changed,vdsold_and_vdso_check)
  79
  80 $(obj)/vdso.so: OBJCOPYFLAGS := -S
  81 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
  82         $(call if_changed,objcopy)
  83
  84 obj-y += vdso.o
  85
  86 $(obj)/vdso.o : $(obj)/vdso.so
  87
  88 # install commands for the unstripped file
  89 quiet_cmd_vdso_install = INSTALL $@
  90       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  91
  92 vdso.so: $(obj)/vdso.so.dbg
  93         @mkdir -p $(MODLIB)/vdso
  94         $(call cmd,vdso_install)
  95
  96 vdso_install: vdso.so