arch/sparc/vdso/Makefile

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