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 --no-undefined \ 26 -z max-page-size=8192 27 28$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 29 $(call if_changed,vdso) 30 31HOST_EXTRACFLAGS += -I$(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 -fcall-used-g5 -fcall-used-g7 50 51$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 52 53# 54# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 55# 56CFLAGS_REMOVE_vclock_gettime.o = -pg 57CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg 58 59$(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 $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 83KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 84KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 85KBUILD_CFLAGS_32 += -fno-stack-protector 86KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 87KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 88KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 89KBUILD_CFLAGS_32 += -mv8plus 90$(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# 101quiet_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 107VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic 108