arch/tile/kernel/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Symbols present in the vdso
   3 vdso-syms = rt_sigreturn gettimeofday
   4
   5 # Files to link into the vdso
   6 obj-vdso = $(patsubst %, v%.o, $(vdso-syms))
   7
   8 # Build rules
   9 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o
  10 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  11
  12 # vdso32 is only for tilegx -m32 compat task.
  13 VDSO32-$(CONFIG_COMPAT) := y
  14
  15 obj-y += vdso.o vdso-syms.o
  16 obj-$(VDSO32-y) += vdso32.o
  17 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  18
  19 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
  20 CFLAGS_REMOVE_vdso.o = -pg
  21 CFLAGS_REMOVE_vdso32.o = -pg
  22 CFLAGS_REMOVE_vrt_sigreturn.o = -pg
  23 CFLAGS_REMOVE_vrt_sigreturn32.o = -pg
  24 CFLAGS_REMOVE_vgettimeofday.o = -pg
  25 CFLAGS_REMOVE_vgettimeofday32.o = -pg
  26
  27 ifdef CONFIG_FEEDBACK_COLLECT
  28 # vDSO code runs in userspace, not collecting feedback data.
  29 CFLAGS_REMOVE_vdso.o = -ffeedback-generate
  30 CFLAGS_REMOVE_vdso32.o = -ffeedback-generate
  31 CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate
  32 CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate
  33 CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate
  34 CFLAGS_REMOVE_vgettimeofday32.o = -ffeedback-generate
  35 endif
  36
  37 # Disable gcov profiling for VDSO code
  38 GCOV_PROFILE := n
  39
  40 # Force dependency
  41 $(obj)/vdso.o: $(obj)/vdso.so
  42
  43 # link rule for the .so file, .lds has to be first
  44 SYSCFLAGS_vdso.so.dbg = $(c_flags)
  45 $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE
  46         $(call if_changed,vdsold)
  47
  48 # We also create a special relocatable object that should mirror the symbol
  49 # table and layout of the linked DSO.  With ld -R we can then refer to
  50 # these symbols in the kernel code rather than hand-coded addresses.
  51
  52 SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
  53                             $(call cc-ldoption, -Wl$(comma)--hash-style=both)
  54 SYSCFLAGS_vdso_dummy.o = -r
  55 $(obj)/vdso-dummy.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE
  56         $(call if_changed,vdsold)
  57
  58 LDFLAGS_vdso-syms.o := -r -R
  59 $(obj)/vdso-syms.o: $(obj)/vdso-dummy.o FORCE
  60         $(call if_changed,ld)
  61
  62 # strip rule for the .so file
  63 $(obj)/%.so: OBJCOPYFLAGS := -S
  64 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  65         $(call if_changed,objcopy)
  66
  67 # actual build commands
  68 # The DSO images are built using a special linker script
  69 # Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions.
  70 # Make sure only to export the intended __vdso_xxx symbol offsets.
  71 quiet_cmd_vdsold = VDSOLD  $@
  72       cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \
  73                            -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \
  74                    $(CROSS_COMPILE)objcopy \
  75                            $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@
  76
  77 # install commands for the unstripped file
  78 quiet_cmd_vdso_install = INSTALL $@
  79       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  80
  81 vdso.so: $(obj)/vdso.so.dbg
  82         @mkdir -p $(MODLIB)/vdso
  83         $(call cmd,vdso_install)
  84
  85 vdso32.so: $(obj)/vdso32.so.dbg
  86         $(call cmd,vdso_install)
  87
  88 vdso_install: vdso.so
  89 vdso32_install: vdso32.so
  90
  91
  92 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
  93 KBUILD_AFLAGS_32 += -m32 -s
  94 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
  95 KBUILD_CFLAGS_32 += -m32 -fPIC -shared
  96
  97 obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms))
  98
  99 targets += $(obj-vdso32) vdso32.so vdso32.so.dbg
 100 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
 101
 102 $(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
 103 $(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 104
 105 $(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c FORCE
 106         $(call if_changed_rule,cc_o_c)
 107
 108 $(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S FORCE
 109         $(call if_changed,as_o_S)
 110
 111 # Force dependency
 112 $(obj)/vdso32.o: $(obj)/vdso32.so
 113
 114 SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \
 115                             $(call cc-ldoption, -Wl$(comma)--hash-style=both)
 116 $(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32) FORCE
 117         $(call if_changed,vdsold)