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
  7vobjs-y := vdso-note.o vclock_gettime.o
  8
  9# files to link into kernel
 10obj-y				+= vma.o
 11
 12# vDSO images to build
 13obj-$(CONFIG_SPARC64)		+= vdso-image-64.o
 14obj-$(CONFIG_COMPAT)		+= vdso-image-32.o
 15
 16vobjs := $(addprefix $(obj)/, $(vobjs-y))
 17
 18$(obj)/vdso.o: $(obj)/vdso.so
 19
 20targets += vdso.lds $(vobjs-y)
 21targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg)
 22
 23CPPFLAGS_vdso.lds += -P -C
 24
 25VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 \
 26			-z max-page-size=8192
 27
 28$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
 29	$(call if_changed,vdso)
 30
 31HOST_EXTRACFLAGS += -I$(srctree)/tools/include
 32hostprogs += vdso2c
 33
 34quiet_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#
 44CFL := $(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
 49SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 $(call cc-option,-fcall-used-g5) $(call cc-option,-fcall-used-g7)
 50
 51$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(KSTACK_ERASE_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
 52
 53#
 54# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
 55#
 56CFLAGS_REMOVE_vclock_gettime.o = -pg
 57CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
 58
 59$(obj)/%.so: OBJCOPYFLAGS := -S
 60$(obj)/%.so: $(obj)/%.so.dbg FORCE
 61	$(call if_changed,objcopy)
 62
 63CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
 64VDSO_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
 68override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
 69
 70targets += vdso32/vdso32.lds
 71targets += vdso32/vdso-note.o
 72targets += vdso32/vclock_gettime.o
 73
 74KBUILD_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
 78KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
 79KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
 80KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
 81KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32))
 82KBUILD_CFLAGS_32 := $(filter-out $(KSTACK_ERASE_CFLAGS),$(KBUILD_CFLAGS_32))
 83KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
 84KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
 85KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
 86KBUILD_CFLAGS_32 += -fno-stack-protector
 87KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
 88KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
 89KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
 90KBUILD_CFLAGS_32 += -mv8plus
 91$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 92
 93$(obj)/vdso32.so.dbg: FORCE \
 94			$(obj)/vdso32/vdso32.lds \
 95			$(obj)/vdso32/vclock_gettime.o \
 96			$(obj)/vdso32/vdso-note.o
 97		$(call	if_changed,vdso)
 98
 99#
100# The DSO images are built using a special linker script.
101#
102quiet_cmd_vdso = VDSO    $@
103      cmd_vdso = $(LD) -nostdlib -o $@ \
104		       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
105		       -T $(filter %.lds,$^) $(filter %.o,$^)
106
107VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic --no-undefined