arch/tile/kernel/vdso/Makefile

   1 # Symbols present in the vdso
   2 vdso-syms = rt_sigreturn gettimeofday
   3
   4 # Files to link into the vdso
   5 obj-vdso = $(patsubst %, v%.o, $(vdso-syms))
   6
   7 # Build rules
   8 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o
   9 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  10
  11 # vdso32 is only for tilegx -m32 compat task.
  12 VDSO32-$(CONFIG_COMPAT) := y
  13
  14 obj-y += vdso.o vdso-syms.o
  15 obj-$(VDSO32-y) += vdso32.o
  16 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  17
  18 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
  19 CFLAGS_REMOVE_vdso.o = -pg
  20 CFLAGS_REMOVE_vdso32.o = -pg
  21 CFLAGS_REMOVE_vrt_sigreturn.o = -pg
  22 CFLAGS_REMOVE_vrt_sigreturn32.o = -pg
  23 CFLAGS_REMOVE_vgettimeofday.o = -pg
  24 CFLAGS_REMOVE_vgettimeofday32.o = -pg
  25
  26 ifdef CONFIG_FEEDBACK_COLLECT
  27 # vDSO code runs in userspace, not collecting feedback data.
  28 CFLAGS_REMOVE_vdso.o = -ffeedback-generate
  29 CFLAGS_REMOVE_vdso32.o = -ffeedback-generate
  30 CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate
  31 CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate
  32 CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate
  33 CFLAGS_REMOVE_vgettimeofday32.o = -ffeedback-generate
  34 endif
  35
  36 # Disable gcov profiling for VDSO code
  37 GCOV_PROFILE := n
  38
  39 # Force dependency
  40 $(obj)/vdso.o: $(obj)/vdso.so
  41
  42 # link rule for the .so file, .lds has to be first
  43 SYSCFLAGS_vdso.so.dbg = $(c_flags)
  44 $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE
  45         $(call if_changed,vdsold)
  46
  47 # We also create a special relocatable object that should mirror the symbol
  48 # table and layout of the linked DSO.  With ld -R we can then refer to
  49 # these symbols in the kernel code rather than hand-coded addresses.
  50
  51 SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
  52                             $(call cc-ldoption, -Wl$(comma)--hash-style=both)
  53 SYSCFLAGS_vdso_dummy.o = -r
  54 $(obj)/vdso-dummy.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE
  55         $(call if_changed,vdsold)
  56
  57 LDFLAGS_vdso-syms.o := -r -R
  58 $(obj)/vdso-syms.o: $(obj)/vdso-dummy.o FORCE
  59         $(call if_changed,ld)
  60
  61 # strip rule for the .so file
  62 $(obj)/%.so: OBJCOPYFLAGS := -S
  63 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  64         $(call if_changed,objcopy)
  65
  66 # actual build commands
  67 # The DSO images are built using a special linker script
  68 # Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions.
  69 # Make sure only to export the intended __vdso_xxx symbol offsets.
  70 quiet_cmd_vdsold = VDSOLD  $@
  71       cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \
  72                            -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \
  73                    $(CROSS_COMPILE)objcopy \
  74                            $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@
  75
  76 # install commands for the unstripped file
  77 quiet_cmd_vdso_install = INSTALL $@
  78       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  79
  80 vdso.so: $(obj)/vdso.so.dbg
  81         @mkdir -p $(MODLIB)/vdso
  82         $(call cmd,vdso_install)
  83
  84 vdso32.so: $(obj)/vdso32.so.dbg
  85         $(call cmd,vdso_install)
  86
  87 vdso_install: vdso.so
  88 vdso32_install: vdso32.so
  89
  90
  91 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
  92 KBUILD_AFLAGS_32 += -m32 -s
  93 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
  94 KBUILD_CFLAGS_32 += -m32 -fPIC -shared
  95
  96 obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms))
  97
  98 targets += $(obj-vdso32) vdso32.so vdso32.so.dbg
  99 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
 100
 101 $(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
 102 $(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 103
 104 $(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c FORCE
 105         $(call if_changed_rule,cc_o_c)
 106
 107 $(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S FORCE
 108         $(call if_changed,as_o_S)
 109
 110 # Force dependency
 111 $(obj)/vdso32.o: $(obj)/vdso32.so
 112
 113 SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \
 114                             $(call cc-ldoption, -Wl$(comma)--hash-style=both)
 115 $(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32) FORCE
 116         $(call if_changed,vdsold)