arch/riscv/kernel/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 # Copied from arch/tile/kernel/vdso/Makefile
   3
   4 # Include the generic Makefile to check the built vdso.
   5 include $(srctree)/lib/vdso/Makefile
   6 # Symbols present in the vdso
   7 vdso-syms  = rt_sigreturn
   8 ifdef CONFIG_64BIT
   9 vdso-syms += vgettimeofday
  10 endif
  11 vdso-syms += getcpu
  12 vdso-syms += flush_icache
  13 vdso-syms += hwprobe
  14 vdso-syms += sys_hwprobe
  15
  16 # Files to link into the vdso
  17 obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
  18
  19 ccflags-y := -fno-stack-protector
  20 ccflags-y += -DDISABLE_BRANCH_PROFILING
  21
  22 ifneq ($(c-gettimeofday-y),)
  23   CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
  24 endif
  25
  26 CFLAGS_hwprobe.o += -fPIC
  27
  28 # Build rules
  29 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds
  30 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  31
  32 obj-y += vdso.o
  33 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  34 ifneq ($(filter vgettimeofday, $(vdso-syms)),)
  35 CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY
  36 endif
  37
  38 # Disable -pg to prevent insert call site
  39 CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
  40 CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
  41
  42 # Force dependency
  43 $(obj)/vdso.o: $(obj)/vdso.so
  44
  45 # link rule for the .so file, .lds has to be first
  46 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
  47         $(call if_changed,vdsold)
  48 LDFLAGS_vdso.so.dbg = -shared -soname=linux-vdso.so.1 \
  49         --build-id=sha1 --hash-style=both --eh-frame-hdr
  50
  51 # strip rule for the .so file
  52 $(obj)/%.so: OBJCOPYFLAGS := -S
  53 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  54         $(call if_changed,objcopy)
  55
  56 # Generate VDSO offsets using helper script
  57 gen-vdsosym := $(src)/gen_vdso_offsets.sh
  58 quiet_cmd_vdsosym = VDSOSYM $@
  59         cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
  60
  61 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
  62         $(call if_changed,vdsosym)
  63
  64 # actual build commands
  65 # The DSO images are built using a special linker script
  66 # Make sure only to export the intended __vdso_xxx symbol offsets.
  67 quiet_cmd_vdsold = VDSOLD  $@
  68       cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
  69                    $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \
  70                    rm $@.tmp