1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Building vDSO images for sparc. 4# 5 6VDSO64-$(CONFIG_SPARC64) := y 7VDSOCOMPAT-$(CONFIG_COMPAT) := y 8 9# files to link into the vdso 10vobjs-y := vdso-note.o vclock_gettime.o 11 12# files to link into kernel 13obj-y += vma.o 14 15# vDSO images to build 16vdso_img-$(VDSO64-y) += 64 17vdso_img-$(VDSOCOMPAT-y) += 32 18 19vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 20 21$(obj)/vdso.o: $(obj)/vdso.so 22 23targets += vdso.lds $(vobjs-y) 24 25# Build the vDSO image C files and link them in. 26vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o) 27vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c) 28vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg) 29obj-y += $(vdso_img_objs) 30targets += $(vdso_img_cfiles) 31targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so) 32 33CPPFLAGS_vdso.lds += -P -C 34 35VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \ 36 -z max-page-size=8192 37 38$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 39 $(call if_changed,vdso) 40 41HOST_EXTRACFLAGS += -I$(srctree)/tools/include 42hostprogs += vdso2c 43 44quiet_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# 54CFL := $(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 59SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7 60 61$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 62 63# 64# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 65# 66CFLAGS_REMOVE_vclock_gettime.o = -pg 67CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg 68 69$(obj)/%.so: OBJCOPYFLAGS := -S 70$(obj)/%.so: $(obj)/%.so.dbg FORCE 71 $(call if_changed,objcopy) 72 73CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds) 74VDSO_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 78override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 79 80targets += vdso32/vdso32.lds 81targets += vdso32/vdso-note.o 82targets += vdso32/vclock_gettime.o 83 84KBUILD_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 88KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 89KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 90KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 91KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32)) 92KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 93KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 94KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 95KBUILD_CFLAGS_32 += -fno-stack-protector 96KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 97KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 98KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 99KBUILD_CFLAGS_32 += -mv8plus 100$(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# 111quiet_cmd_vdso = VDSO $@ 112 cmd_vdso = $(LD) -nostdlib -o $@ \ 113 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 114 -T $(filter %.lds,$^) $(filter %.o,$^) && \ 115 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@' 116 117VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic 118GCOV_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# 124quiet_cmd_vdso_install = INSTALL $(@:install_%=%) 125define 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 134endef 135 136vdso_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 144PHONY += vdso_install $(vdso_img_insttargets) 145vdso_install: $(vdso_img_insttargets) FORCE 146