arch/arm/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 # Include the generic Makefile to check the built vdso.
   4 include $(srctree)/lib/vdso/Makefile
   5
   6 hostprogs := vdsomunge
   7
   8 obj-vdso := vgettimeofday.o datapage.o note.o
   9
  10 # Build rules
  11 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
  12 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  13
  14 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
  15 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
  16
  17 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
  18 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  19             -z max-page-size=4096 -shared $(ldflags-y) \
  20             --hash-style=sysv --build-id=sha1 \
  21             -T
  22
  23 obj-$(CONFIG_VDSO) += vdso.o
  24 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  25
  26 CFLAGS_REMOVE_vdso.o = -pg
  27
  28 # Force -O2 to avoid libgcc dependencies
  29 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS)
  30 ifeq ($(c-gettimeofday-y),)
  31 CFLAGS_vgettimeofday.o = -O2
  32 else
  33 CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
  34 endif
  35
  36 # Disable gcov profiling for VDSO code
  37 GCOV_PROFILE := n
  38 UBSAN_SANITIZE := n
  39
  40 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  41 KCOV_INSTRUMENT := n
  42
  43 KASAN_SANITIZE := n
  44
  45 # Force dependency
  46 $(obj)/vdso.o : $(obj)/vdso.so
  47
  48 # Link rule for the .so file
  49 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  50         $(call if_changed,vdsold_and_vdso_check)
  51
  52 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
  53         $(call if_changed,vdsomunge)
  54
  55 # Strip rule for the .so file
  56 $(obj)/%.so: OBJCOPYFLAGS := -S
  57 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  58         $(call if_changed,objcopy)
  59
  60 # Actual build commands
  61 quiet_cmd_vdsold_and_vdso_check = LD      $@
  62       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
  63
  64 quiet_cmd_vdsomunge = MUNGE   $@
  65       cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@