arch/sparc/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Building vDSO images for sparc.
   4 #
   5
   6 VDSO64-$(CONFIG_SPARC64)        := y
   7 VDSOCOMPAT-$(CONFIG_COMPAT)     := y
   8
   9 # files to link into the vdso
  10 vobjs-y := vdso-note.o vclock_gettime.o
  11
  12 # files to link into kernel
  13 obj-y                           += vma.o
  14
  15 # vDSO images to build
  16 vdso_img-$(VDSO64-y)            += 64
  17 vdso_img-$(VDSOCOMPAT-y)        += 32
  18
  19 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
  20
  21 $(obj)/vdso.o: $(obj)/vdso.so
  22
  23 targets += vdso.lds $(vobjs-y)
  24
  25 # Build the vDSO image C files and link them in.
  26 vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
  27 vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
  28 vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
  29 obj-y += $(vdso_img_objs)
  30 targets += $(vdso_img_cfiles)
  31 targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
  32
  33 CPPFLAGS_vdso.lds += -P -C
  34
  35 VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
  36                         -z max-page-size=8192
  37
  38 $(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
  39         $(call if_changed,vdso)
  40
  41 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
  42 hostprogs += vdso2c
  43
  44 quiet_cmd_vdso2c = VDSO2C  $@
  45       cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
  46
  47 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
  48         $(call if_changed,vdso2c)
  49
  50 #
  51 # Don't omit frame pointers for ease of userspace debugging, but do
  52 # optimize sibling calls.
  53 #
  54 CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
  55        $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
  56        -fno-omit-frame-pointer -foptimize-sibling-calls \
  57        -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
  58
  59 SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7
  60
  61 $(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
  62
  63 #
  64 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
  65 #
  66 CFLAGS_REMOVE_vclock_gettime.o = -pg
  67 CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
  68
  69 $(obj)/%.so: OBJCOPYFLAGS := -S
  70 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  71         $(call if_changed,objcopy)
  72
  73 CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
  74 VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
  75
  76 #This makes sure the $(obj) subdirectory exists even though vdso32/
  77 #is not a kbuild sub-make subdirectory
  78 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
  79
  80 targets += vdso32/vdso32.lds
  81 targets += vdso32/vdso-note.o
  82 targets += vdso32/vclock_gettime.o
  83
  84 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
  85 $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
  86 $(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
  87
  88 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
  89 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
  90 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
  91 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
  92 KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
  93 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
  94 KBUILD_CFLAGS_32 += -fno-stack-protector
  95 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
  96 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
  97 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
  98 KBUILD_CFLAGS_32 += -mv8plus
  99 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 100
 101 $(obj)/vdso32.so.dbg: FORCE \
 102                         $(obj)/vdso32/vdso32.lds \
 103                         $(obj)/vdso32/vclock_gettime.o \
 104                         $(obj)/vdso32/vdso-note.o
 105                 $(call  if_changed,vdso)
 106
 107 #
 108 # The DSO images are built using a special linker script.
 109 #
 110 quiet_cmd_vdso = VDSO    $@
 111       cmd_vdso = $(LD) -nostdlib -o $@ \
 112                        $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
 113                        -T $(filter %.lds,$^) $(filter %.o,$^) && \
 114                 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@'
 115
 116 VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic
 117 GCOV_PROFILE := n
 118
 119 #
 120 # Install the unstripped copies of vdso*.so.  If our toolchain supports
 121 # build-id, install .build-id links as well.
 122 #
 123 quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
 124 define cmd_vdso_install
 125         cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
 126         if readelf -n $< |grep -q 'Build ID'; then \
 127           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
 128           first=`echo $$buildid | cut -b-2`; \
 129           last=`echo $$buildid | cut -b3-`; \
 130           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
 131           ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
 132         fi
 133 endef
 134
 135 vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
 136
 137 $(MODLIB)/vdso: FORCE
 138         @mkdir -p $(MODLIB)/vdso
 139
 140 $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
 141         $(call cmd,vdso_install)
 142
 143 PHONY += vdso_install $(vdso_img_insttargets)
 144 vdso_install: $(vdso_img_insttargets) FORCE