arch/sparc/vdso/Makefile

   1 #
   2 # Building vDSO images for sparc.
   3 #
   4
   5 KBUILD_CFLAGS += $(DISABLE_LTO)
   6
   7 VDSO64-$(CONFIG_SPARC64)        := y
   8 VDSOCOMPAT-$(CONFIG_COMPAT)     := y
   9
  10 # files to link into the vdso
  11 vobjs-y := vdso-note.o vclock_gettime.o
  12
  13 # files to link into kernel
  14 obj-y                           += vma.o
  15
  16 # vDSO images to build
  17 vdso_img-$(VDSO64-y)            += 64
  18 vdso_img-$(VDSOCOMPAT-y)        += 32
  19
  20 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
  21
  22 $(obj)/vdso.o: $(obj)/vdso.so
  23
  24 targets += vdso.lds $(vobjs-y)
  25
  26 # Build the vDSO image C files and link them in.
  27 vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
  28 vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
  29 vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
  30 obj-y += $(vdso_img_objs)
  31 targets += $(vdso_img_cfiles)
  32 targets += $(vdso_img_sodbg)
  33 .SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
  34         $(vdso_img-y:%=$(obj)/vdso%.so)
  35
  36 export CPPFLAGS_vdso.lds += -P -C
  37
  38 VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
  39                         -Wl,--no-undefined \
  40                         -Wl,-z,max-page-size=8192 -Wl,-z,common-page-size=8192 \
  41                         $(DISABLE_LTO)
  42
  43 $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
  44         $(call if_changed,vdso)
  45
  46 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
  47 hostprogs-y                     += vdso2c
  48
  49 quiet_cmd_vdso2c = VDSO2C  $@
  50 define cmd_vdso2c
  51         $(obj)/vdso2c $< $(<:%.dbg=%) $@
  52 endef
  53
  54 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
  55         $(call if_changed,vdso2c)
  56
  57 #
  58 # Don't omit frame pointers for ease of userspace debugging, but do
  59 # optimize sibling calls.
  60 #
  61 CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables \
  62        -m64 -ffixed-g2 -ffixed-g3 -fcall-used-g4 -fcall-used-g5 -ffixed-g6 \
  63        -ffixed-g7 $(filter -g%,$(KBUILD_CFLAGS)) \
  64        $(call cc-option, -fno-stack-protector) -fno-omit-frame-pointer \
  65        -foptimize-sibling-calls -DBUILD_VDSO
  66
  67 $(vobjs): KBUILD_CFLAGS += $(CFL)
  68
  69 #
  70 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
  71 #
  72 CFLAGS_REMOVE_vdso-note.o = -pg
  73 CFLAGS_REMOVE_vclock_gettime.o = -pg
  74
  75 $(obj)/%.so: OBJCOPYFLAGS := -S
  76 $(obj)/%.so: $(obj)/%.so.dbg
  77         $(call if_changed,objcopy)
  78
  79 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
  80 VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1
  81
  82 #This makes sure the $(obj) subdirectory exists even though vdso32/
  83 #is not a kbuild sub-make subdirectory
  84 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
  85
  86 targets += vdso32/vdso32.lds
  87 targets += vdso32/vdso-note.o
  88 targets += vdso32/vclock_gettime.o
  89
  90 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
  91 $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
  92 $(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
  93
  94 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
  95 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
  96 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
  97 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
  98 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7
  99 KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
 100 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
 101 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
 102 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
 103 KBUILD_CFLAGS_32 += -mv8plus
 104 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 105
 106 $(obj)/vdso32.so.dbg: FORCE \
 107                         $(obj)/vdso32/vdso32.lds \
 108                         $(obj)/vdso32/vclock_gettime.o \
 109                         $(obj)/vdso32/vdso-note.o
 110                 $(call  if_changed,vdso)
 111
 112 #
 113 # The DSO images are built using a special linker script.
 114 #
 115 quiet_cmd_vdso = VDSO    $@
 116       cmd_vdso = $(CC) -nostdlib -o $@ \
 117                        $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
 118                        -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
 119
 120 VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
 121         $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic
 122 GCOV_PROFILE := n
 123
 124 #
 125 # Install the unstripped copies of vdso*.so.  If our toolchain supports
 126 # build-id, install .build-id links as well.
 127 #
 128 quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
 129 define cmd_vdso_install
 130         cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
 131         if readelf -n $< |grep -q 'Build ID'; then \
 132           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
 133           first=`echo $$buildid | cut -b-2`; \
 134           last=`echo $$buildid | cut -b3-`; \
 135           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
 136           ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
 137         fi
 138 endef
 139
 140 vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
 141
 142 $(MODLIB)/vdso: FORCE
 143         @mkdir -p $(MODLIB)/vdso
 144
 145 $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
 146         $(call cmd,vdso_install)
 147
 148 PHONY += vdso_install $(vdso_img_insttargets)
 149 vdso_install: $(vdso_img_insttargets) FORCE