arch/sparc/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # Building vDSO images for sparc.
   4 #
   5
   6 # files to link into the vdso
   7 vobjs-y := vdso-note.o vclock_gettime.o
   8
   9 # files to link into kernel
  10 obj-y                           += vma.o
  11
  12 # vDSO images to build
  13 obj-$(CONFIG_SPARC64)           += vdso-image-64.o
  14 obj-$(CONFIG_COMPAT)            += vdso-image-32.o
  15
  16 vobjs := $(addprefix $(obj)/, $(vobjs-y))
  17
  18 $(obj)/vdso.o: $(obj)/vdso.so
  19
  20 targets += vdso.lds $(vobjs-y)
  21 targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg)
  22
  23 CPPFLAGS_vdso.lds += -P -C
  24
  25 VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
  26                         -z max-page-size=8192
  27
  28 $(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
  29         $(call if_changed,vdso)
  30
  31 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
  32 hostprogs += vdso2c
  33
  34 quiet_cmd_vdso2c = VDSO2C  $@
  35       cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
  36
  37 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
  38         $(call if_changed,vdso2c)
  39
  40 #
  41 # Don't omit frame pointers for ease of userspace debugging, but do
  42 # optimize sibling calls.
  43 #
  44 CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
  45        $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
  46        -fno-omit-frame-pointer -foptimize-sibling-calls \
  47        -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
  48
  49 SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7
  50
  51 $(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
  52
  53 #
  54 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
  55 #
  56 CFLAGS_REMOVE_vclock_gettime.o = -pg
  57 CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
  58
  59 $(obj)/%.so: OBJCOPYFLAGS := -S
  60 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  61         $(call if_changed,objcopy)
  62
  63 CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
  64 VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
  65
  66 #This makes sure the $(obj) subdirectory exists even though vdso32/
  67 #is not a kbuild sub-make subdirectory
  68 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
  69
  70 targets += vdso32/vdso32.lds
  71 targets += vdso32/vdso-note.o
  72 targets += vdso32/vclock_gettime.o
  73
  74 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
  75 $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
  76 $(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
  77
  78 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
  79 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
  80 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
  81 KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32))
  82 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
  83 KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
  84 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
  85 KBUILD_CFLAGS_32 += -fno-stack-protector
  86 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
  87 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
  88 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
  89 KBUILD_CFLAGS_32 += -mv8plus
  90 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
  91
  92 $(obj)/vdso32.so.dbg: FORCE \
  93                         $(obj)/vdso32/vdso32.lds \
  94                         $(obj)/vdso32/vclock_gettime.o \
  95                         $(obj)/vdso32/vdso-note.o
  96                 $(call  if_changed,vdso)
  97
  98 #
  99 # The DSO images are built using a special linker script.
 100 #
 101 quiet_cmd_vdso = VDSO    $@
 102       cmd_vdso = $(LD) -nostdlib -o $@ \
 103                        $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
 104                        -T $(filter %.lds,$^) $(filter %.o,$^) && \
 105                 sh $(src)/checkundef.sh '$(OBJDUMP)' '$@'
 106
 107 VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic