1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Building vDSO images for sparc. 4# 5UBSAN_SANITIZE := n 6 7# files to link into the vdso 8vobjs-y := vdso-note.o vclock_gettime.o 9 10# files to link into kernel 11obj-y += vma.o 12 13# vDSO images to build 14obj-$(CONFIG_SPARC64) += vdso-image-64.o 15obj-$(CONFIG_COMPAT) += vdso-image-32.o 16 17vobjs := $(addprefix $(obj)/, $(vobjs-y)) 18 19$(obj)/vdso.o: $(obj)/vdso.so 20 21targets += vdso.lds $(vobjs-y) 22targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg) 23 24CPPFLAGS_vdso.lds += -P -C 25 26VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \ 27 -z max-page-size=8192 28 29$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE 30 $(call if_changed,vdso) 31 32HOST_EXTRACFLAGS += -I$(srctree)/tools/include 33hostprogs += vdso2c 34 35quiet_cmd_vdso2c = VDSO2C $@ 36 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@ 37 38$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE 39 $(call if_changed,vdso2c) 40 41# 42# Don't omit frame pointers for ease of userspace debugging, but do 43# optimize sibling calls. 44# 45CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \ 46 $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ 47 -fno-omit-frame-pointer -foptimize-sibling-calls \ 48 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO 49 50SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7 51 52$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL) 53 54# 55# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 56# 57CFLAGS_REMOVE_vclock_gettime.o = -pg 58CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg 59 60$(obj)/%.so: OBJCOPYFLAGS := -S 61$(obj)/%.so: $(obj)/%.so.dbg FORCE 62 $(call if_changed,objcopy) 63 64CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds) 65VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1 66 67#This makes sure the $(obj) subdirectory exists even though vdso32/ 68#is not a kbuild sub-make subdirectory 69override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ 70 71targets += vdso32/vdso32.lds 72targets += vdso32/vdso-note.o 73targets += vdso32/vclock_gettime.o 74 75KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO 76$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 77$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32 78 79KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 80KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32)) 81KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32)) 82KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32)) 83KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32)) 84KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32)) 85KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic 86KBUILD_CFLAGS_32 += -fno-stack-protector 87KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls) 88KBUILD_CFLAGS_32 += -fno-omit-frame-pointer 89KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING 90KBUILD_CFLAGS_32 += -mv8plus 91$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 92 93$(obj)/vdso32.so.dbg: FORCE \ 94 $(obj)/vdso32/vdso32.lds \ 95 $(obj)/vdso32/vclock_gettime.o \ 96 $(obj)/vdso32/vdso-note.o 97 $(call if_changed,vdso) 98 99# 100# The DSO images are built using a special linker script. 101# 102quiet_cmd_vdso = VDSO $@ 103 cmd_vdso = $(LD) -nostdlib -o $@ \ 104 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ 105 -T $(filter %.lds,$^) $(filter %.o,$^) && \ 106 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@' 107 108VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic 109GCOV_PROFILE := n 110