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