1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Building vDSO images for sparc. 4# 5 6# Include the generic Makefile to check the built vDSO: 7include $(srctree)/lib/vdso/Makefile.include 8 9# files to link into the vdso 10vobjs-y := vdso-note.o vclock_gettime.o 11 12# files to link into kernel 13obj-y += vma.o 14 15# vDSO images to build 16obj-$(CONFIG_SPARC64) += vdso-image-64.o 17obj-$(CONFIG_COMPAT) += vdso-image-32.o 18 19vobjs := $(addprefix $(obj)/, $(vobjs-y)) 20 21$(obj)/vdso.o: $(obj)/vdso.so 22 23targets += vdso.lds $(vobjs-y) 24targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg) 25 26CPPFLAGS_vdso.lds += -P -C 27 28VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 \ 29 -z max-page-size=8192 30 31$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 32 $(call if_changed,vdso) 33 34HOST_EXTRACFLAGS += -I$(srctree)/tools/include 35hostprogs += vdso2c 36 37quiet_cmd_vdso2c = VDSO2C $@ 38 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@ 39 40$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE 41 $(call if_changed,vdso2c) 42 43# 44# Don't omit frame pointers for ease of userspace debugging, but do 45# optimize sibling calls. 46# 47CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 48 $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ 49 -fno-omit-frame-pointer -foptimize-sibling-calls \ 50 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO 51 52SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 $(call cc-option,-fcall-used-g5) $(call cc-option,-fcall-used-g7) 53 54$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(KSTACK_ERASE_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 55 56# 57# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 58# 59CFLAGS_REMOVE_vclock_gettime.o = -pg 60CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg 61 62$(obj)/%.so: OBJCOPYFLAGS := -S 63$(obj)/%.so: $(obj)/%.so.dbg FORCE 64 $(call if_changed,objcopy) 65 66CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds) 67VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1 68 69#This makes sure the $(obj) subdirectory exists even though vdso32/ 70#is not a kbuild sub-make subdirectory 71override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 72 73targets += vdso32/vdso32.lds 74targets += vdso32/vdso-note.o 75targets += vdso32/vclock_gettime.o 76 77KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO 78$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 79$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32 80 81KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 82KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 83KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 84KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32)) 85KBUILD_CFLAGS_32 := $(filter-out $(KSTACK_ERASE_CFLAGS),$(KBUILD_CFLAGS_32)) 86KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 87KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 88KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 89KBUILD_CFLAGS_32 += -fno-stack-protector 90KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 91KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 92KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 93KBUILD_CFLAGS_32 += -mv8plus 94$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 95 96CHECKFLAGS_32 := $(filter-out -m64 -D__sparc_v9__ -D__arch64__, $(CHECKFLAGS)) -m32 97$(obj)/vdso32.so.dbg: CHECKFLAGS = $(CHECKFLAGS_32) 98 99$(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 $(cmd_vdso_check) 113 114VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic --no-undefined -z noexecstack 115