1# Symbols present in the vdso
  2vdso-syms = rt_sigreturn gettimeofday
  3
  4# Files to link into the vdso
  5obj-vdso = $(patsubst %, v%.o, $(vdso-syms))
  6
  7# Build rules
  8targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds
  9obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
 10
 11# vdso32 is only for tilegx -m32 compat task.
 12VDSO32-$(CONFIG_COMPAT) := y
 13
 14obj-y += vdso.o
 15obj-$(VDSO32-y) += vdso32.o
 16extra-y += vdso.lds
 17CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
 18
 19# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
 20CFLAGS_REMOVE_vdso.o = -pg
 21CFLAGS_REMOVE_vdso32.o = -pg
 22CFLAGS_REMOVE_vrt_sigreturn.o = -pg
 23CFLAGS_REMOVE_vrt_sigreturn32.o = -pg
 24CFLAGS_REMOVE_vgettimeofday.o = -pg
 25CFLAGS_REMOVE_vgettimeofday32.o = -pg
 26
 27ifdef CONFIG_FEEDBACK_COLLECT
 28# vDSO code runs in userspace, not collecting feedback data.
 29CFLAGS_REMOVE_vdso.o = -ffeedback-generate
 30CFLAGS_REMOVE_vdso32.o = -ffeedback-generate
 31CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate
 32CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate
 33CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate
 34CFLAGS_REMOVE_vgettimeofday32.o = -ffeedback-generate
 35endif
 36
 37# Disable gcov profiling for VDSO code
 38GCOV_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
 44SYSCFLAGS_vdso.so.dbg = $(c_flags)
 45$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso)
 46	$(call if_changed,vdsold)
 47
 48
 49# We also create a special relocatable object that should mirror the symbol
 50# table and layout of the linked DSO.  With ld -R we can then refer to
 51# these symbols in the kernel code rather than hand-coded addresses.
 52extra-y += vdso-syms.o
 53$(obj)/built-in.o: $(obj)/vdso-syms.o
 54$(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o
 55
 56SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
 57                            $(call cc-ldoption, -Wl$(comma)--hash-style=both)
 58SYSCFLAGS_vdso_syms.o = -r
 59$(obj)/vdso-syms.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE
 60	$(call if_changed,vdsold)
 61
 62
 63# strip rule for the .so file
 64$(obj)/%.so: OBJCOPYFLAGS := -S
 65$(obj)/%.so: $(obj)/%.so.dbg FORCE
 66	$(call if_changed,objcopy)
 67
 68# actual build commands
 69# The DSO images are built using a special linker script
 70# Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions.
 71# Make sure only to export the intended __vdso_xxx symbol offsets.
 72quiet_cmd_vdsold = VDSOLD  $@
 73      cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \
 74                           -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \
 75                   $(CROSS_COMPILE)objcopy \
 76                           $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@
 77
 78# install commands for the unstripped file
 79quiet_cmd_vdso_install = INSTALL $@
 80      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
 81
 82vdso.so: $(obj)/vdso.so.dbg
 83	@mkdir -p $(MODLIB)/vdso
 84	$(call cmd,vdso_install)
 85
 86vdso32.so: $(obj)/vdso32.so.dbg
 87	$(call cmd,vdso_install)
 88
 89vdso_install: vdso.so
 90vdso32_install: vdso32.so
 91
 92
 93KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
 94KBUILD_AFLAGS_32 += -m32 -s
 95KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
 96KBUILD_CFLAGS_32 += -m32 -fPIC -shared
 97
 98obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms))
 99obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
100
101targets += $(obj-vdso32) vdso32.so vdso32.so.dbg
102
103$(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
104$(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
105
106$(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c
107	$(call if_changed_rule,cc_o_c)
108
109$(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S
110	$(call if_changed,as_o_S)
111
112# Force dependency
113$(obj)/vdso32.o: $(obj)/vdso32.so
114
115SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \
116			    $(call cc-ldoption, -Wl$(comma)--hash-style=both)
117$(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32)
118	$(call if_changed,vdsold)