1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Building vDSO images for sparc. 4# 5 6KBUILD_CFLAGS += $(DISABLE_LTO) 7 8VDSO64-$(CONFIG_SPARC64) := y 9VDSOCOMPAT-$(CONFIG_COMPAT) := y 10 11# files to link into the vdso 12vobjs-y := vdso-note.o vclock_gettime.o 13 14# files to link into kernel 15obj-y += vma.o 16 17# vDSO images to build 18vdso_img-$(VDSO64-y) += 64 19vdso_img-$(VDSOCOMPAT-y) += 32 20 21vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) 22 23$(obj)/vdso.o: $(obj)/vdso.so 24 25targets += vdso.lds $(vobjs-y) 26 27# Build the vDSO image C files and link them in. 28vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o) 29vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c) 30vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg) 31obj-y += $(vdso_img_objs) 32targets += $(vdso_img_cfiles) 33targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so) 34 35CPPFLAGS_vdso.lds += -P -C 36 37VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \ 38 -z max-page-size=8192 39 40$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 41 $(call if_changed,vdso) 42 43HOST_EXTRACFLAGS += -I$(srctree)/tools/include 44hostprogs-y += vdso2c 45 46quiet_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# 56CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 57 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ 58 -fno-omit-frame-pointer -foptimize-sibling-calls \ 59 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO 60 61SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7 62 63$(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 64 65# 66# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 67# 68CFLAGS_REMOVE_vclock_gettime.o = -pg 69CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg 70 71$(obj)/%.so: OBJCOPYFLAGS := -S 72$(obj)/%.so: $(obj)/%.so.dbg FORCE 73 $(call if_changed,objcopy) 74 75CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds) 76VDSO_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 80override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 81 82targets += vdso32/vdso32.lds 83targets += vdso32/vdso-note.o 84targets += vdso32/vclock_gettime.o 85 86KBUILD_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 90KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 91KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 92KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 93KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 94KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 95KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 96KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) 97KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 98KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 99KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 100KBUILD_CFLAGS_32 += -mv8plus 101$(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# 112quiet_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 118VDSO_LDFLAGS = -shared --hash-style=both --build-id -Bsymbolic 119GCOV_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# 125quiet_cmd_vdso_install = INSTALL $(@:install_%=%) 126define 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 135endef 136 137vdso_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 145PHONY += vdso_install $(vdso_img_insttargets) 146vdso_install: $(vdso_img_insttargets) FORCE 147