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) 27obj-y += $(vdso_img_objs) 28targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg) 29 30CPPFLAGS_vdso.lds += -P -C 31 32VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \ 33 -z max-page-size=8192 34 35$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 36 $(call if_changed,vdso) 37 38HOST_EXTRACFLAGS += -I$(srctree)/tools/include 39hostprogs += vdso2c 40 41quiet_cmd_vdso2c = VDSO2C $@ 42 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@ 43 44$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE 45 $(call if_changed,vdso2c) 46 47# 48# Don't omit frame pointers for ease of userspace debugging, but do 49# optimize sibling calls. 50# 51CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 52 $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ 53 -fno-omit-frame-pointer -foptimize-sibling-calls \ 54 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO 55 56SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7 57 58$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 59 60# 61# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 62# 63CFLAGS_REMOVE_vclock_gettime.o = -pg 64CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg 65 66$(obj)/%.so: OBJCOPYFLAGS := -S 67$(obj)/%.so: $(obj)/%.so.dbg FORCE 68 $(call if_changed,objcopy) 69 70CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds) 71VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1 72 73#This makes sure the $(obj) subdirectory exists even though vdso32/ 74#is not a kbuild sub-make subdirectory 75override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 76 77targets += vdso32/vdso32.lds 78targets += vdso32/vdso-note.o 79targets += vdso32/vclock_gettime.o 80 81KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO 82$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 83$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32 84 85KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 86KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 87KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 88KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32)) 89KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 90KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 91KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 92KBUILD_CFLAGS_32 += -fno-stack-protector 93KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 94KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 95KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 96KBUILD_CFLAGS_32 += -mv8plus 97$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 98 99$(obj)/vdso32.so.dbg: FORCE \ 100 $(obj)/vdso32/vdso32.lds \ 101 $(obj)/vdso32/vclock_gettime.o \ 102 $(obj)/vdso32/vdso-note.o 103 $(call if_changed,vdso) 104 105# 106# The DSO images are built using a special linker script. 107# 108quiet_cmd_vdso = VDSO $@ 109 cmd_vdso = $(LD) -nostdlib -o $@ \ 110 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 111 -T $(filter %.lds,$^) $(filter %.o,$^) && \ 112 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@' 113 114VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic 115GCOV_PROFILE := n 116