1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 2e2c0cdfbSPalmer Dabbelt# Copied from arch/tile/kernel/vdso/Makefile 3e2c0cdfbSPalmer Dabbelt 4aff69273SFangrui Song# Include the generic Makefile to check the built vdso. 5127b0e05SThomas Weißschuhinclude $(srctree)/lib/vdso/Makefile.include 6e2c0cdfbSPalmer Dabbelt# Symbols present in the vdso 7e2c0cdfbSPalmer Dabbeltvdso-syms = rt_sigreturn 8d4c08b97SArnd Bergmannifdef CONFIG_64BIT 9ad5d1122SVincent Chenvdso-syms += vgettimeofday 10d4c08b97SArnd Bergmannendif 1128dfbe6eSAndrew Watermanvdso-syms += getcpu 12921ebd8fSAndrew Watermanvdso-syms += flush_icache 13aa5af0aaSEvan Greenvdso-syms += hwprobe 14aa5af0aaSEvan Greenvdso-syms += sys_hwprobe 15e2c0cdfbSPalmer Dabbelt 16ee0d0305SXi Ruoyaoifdef CONFIG_VDSO_GETRANDOM 17ee0d0305SXi Ruoyaovdso-syms += getrandom 18ee0d0305SXi Ruoyaoendif 19ee0d0305SXi Ruoyao 2037f57bd3SJim Shuifdef VDSO_CFI_BUILD 2137f57bd3SJim ShuCFI_MARCH = _zicfilp_zicfiss 2237f57bd3SJim ShuCFI_FULL = -fcf-protection=full 23ccad8c13SDeepak GuptaCFI_SUFFIX = -cfi 24ccad8c13SDeepak GuptaOFFSET_SUFFIX = _cfi 25ccad8c13SDeepak Guptaccflags-y += -DVDSO_CFI=1 26ccad8c13SDeepak Guptaasflags-y += -DVDSO_CFI=1 2737f57bd3SJim Shuendif 2837f57bd3SJim Shu 29e2c0cdfbSPalmer Dabbelt# Files to link into the vdso 300a9f2a61SAndreas Schwabobj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o 31e2c0cdfbSPalmer Dabbelt 32ee0d0305SXi Ruoyaoifdef CONFIG_VDSO_GETRANDOM 33ee0d0305SXi Ruoyaoobj-vdso += vgetrandom-chacha.o 34ee0d0305SXi Ruoyaoendif 35ee0d0305SXi Ruoyao 3640284a07STobias Klauserccflags-y := -fno-stack-protector 3774f6bb55SJisheng Zhangccflags-y += -DDISABLE_BRANCH_PROFILING 38bf40167dSAlexandre Ghiticcflags-y += -fno-builtin 3937f57bd3SJim Shuccflags-y += $(KBUILD_BASE_ISA)$(CFI_MARCH) 4037f57bd3SJim Shuccflags-y += $(CFI_FULL) 4137f57bd3SJim Shuasflags-y += $(KBUILD_BASE_ISA)$(CFI_MARCH) 4237f57bd3SJim Shuasflags-y += $(CFI_FULL) 4340284a07STobias Klauser 44*9cfff2edSThomas Weißschuhccflags-remove-y += $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO) 45*9cfff2edSThomas Weißschuh 46ad5d1122SVincent Chenifneq ($(c-gettimeofday-y),) 47a0fc3b32SVincent Chen CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y) 48ad5d1122SVincent Chenendif 49ad5d1122SVincent Chen 50ee0d0305SXi Ruoyaoifneq ($(c-getrandom-y),) 51ee0d0305SXi Ruoyao CFLAGS_getrandom.o += -fPIC -include $(c-getrandom-y) 52ee0d0305SXi Ruoyaoendif 53ee0d0305SXi Ruoyao 54aa5af0aaSEvan GreenCFLAGS_hwprobe.o += -fPIC 55aa5af0aaSEvan Green 56e2c0cdfbSPalmer Dabbelt# Build rules 57ccad8c13SDeepak Guptavdso_offsets := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),)-offsets.h 58ccad8c13SDeepak Guptavdso_o := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).o 59ccad8c13SDeepak Guptavdso_so := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).so 60ccad8c13SDeepak Guptavdso_so_dbg := vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).so.dbg 61ccad8c13SDeepak Guptavdso_lds := vdso.lds 62ccad8c13SDeepak Gupta 63ccad8c13SDeepak Guptatargets := $(obj-vdso) $(vdso_so) $(vdso_so_dbg) $(vdso_lds) 64ccad8c13SDeepak Gupta 65e2c0cdfbSPalmer Dabbeltobj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 66e2c0cdfbSPalmer Dabbelt 67ccad8c13SDeepak Guptaobj-y += vdso$(if $(VDSO_CFI_BUILD),$(CFI_SUFFIX),).o 68ccad8c13SDeepak GuptaCPPFLAGS_$(vdso_lds) += -P -C -U$(ARCH) 69fcae44fdSNathan Chancellorifneq ($(filter vgettimeofday, $(vdso-syms)),) 70ccad8c13SDeepak GuptaCPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY 71fcae44fdSNathan Chancellorendif 72e2c0cdfbSPalmer Dabbelt 73e2c0cdfbSPalmer Dabbelt# Force dependency 74ccad8c13SDeepak Gupta$(obj)/$(vdso_o): $(obj)/$(vdso_so) 75e2c0cdfbSPalmer Dabbelt 76e2c0cdfbSPalmer Dabbelt# link rule for the .so file, .lds has to be first 77ccad8c13SDeepak Gupta$(obj)/$(vdso_so_dbg): $(obj)/$(vdso_lds) $(obj-vdso) FORCE 78c6898d66SAlexandre Ghiti $(call if_changed,vdsold_and_check) 79ccad8c13SDeepak GuptaLDFLAGS_$(vdso_so_dbg) = -shared -soname=linux-vdso.so.1 \ 802940954cSXi Ruoyao --build-id=sha1 --eh-frame-hdr 81e2c0cdfbSPalmer Dabbelt 82e2c0cdfbSPalmer Dabbelt# strip rule for the .so file 83e2c0cdfbSPalmer Dabbelt$(obj)/%.so: OBJCOPYFLAGS := -S 84e2c0cdfbSPalmer Dabbelt$(obj)/%.so: $(obj)/%.so.dbg FORCE 85e2c0cdfbSPalmer Dabbelt $(call if_changed,objcopy) 86e2c0cdfbSPalmer Dabbelt 87fde9c59aSSaleem Abdulrasool# Generate VDSO offsets using helper script 88b1992c37SMasahiro Yamadagen-vdsosym := $(src)/gen_vdso_offsets.sh 89fde9c59aSSaleem Abdulrasoolquiet_cmd_vdsosym = VDSOSYM $@ 90ccad8c13SDeepak Gupta cmd_vdsosym = $(NM) $< | $(gen-vdsosym) $(OFFSET_SUFFIX) | LC_ALL=C sort > $@ 91fde9c59aSSaleem Abdulrasool 92ccad8c13SDeepak Guptainclude/generated/$(vdso_offsets): $(obj)/$(vdso_so_dbg) FORCE 93fde9c59aSSaleem Abdulrasool $(call if_changed,vdsosym) 94fde9c59aSSaleem Abdulrasool 95e2c0cdfbSPalmer Dabbelt# actual build commands 96e2c0cdfbSPalmer Dabbelt# The DSO images are built using a special linker script 97e2c0cdfbSPalmer Dabbelt# Make sure only to export the intended __vdso_xxx symbol offsets. 98c6898d66SAlexandre Ghitiquiet_cmd_vdsold_and_check = VDSOLD $@ 9937f57bd3SJim Shu cmd_vdsold_and_check = $(LD) $(CFI_FULL) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \ 1007f3d3490SNathan Chancellor $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ 101c6898d66SAlexandre Ghiti rm $@.tmp && \ 102c6898d66SAlexandre Ghiti $(cmd_vdso_check) 103