1# SPDX-License-Identifier: GPL-2.0-only 2# Copied from arch/tile/kernel/vdso/Makefile 3 4# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before 5# the inclusion of generic Makefile. 6ARCH_REL_TYPE_ABS := R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT 7include $(srctree)/lib/vdso/Makefile 8# Symbols present in the vdso 9vdso-syms = rt_sigreturn 10ifdef CONFIG_64BIT 11vdso-syms += vgettimeofday 12endif 13vdso-syms += getcpu 14vdso-syms += flush_icache 15 16# Files to link into the vdso 17obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o 18 19ifneq ($(c-gettimeofday-y),) 20 CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) 21endif 22 23# Build rules 24targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o 25obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 26 27obj-y += vdso.o vdso-syms.o 28CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 29 30# Disable gcov profiling for VDSO code 31GCOV_PROFILE := n 32 33# Force dependency 34$(obj)/vdso.o: $(obj)/vdso.so 35 36# link rule for the .so file, .lds has to be first 37SYSCFLAGS_vdso.so.dbg = $(c_flags) 38$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE 39 $(call if_changed,vdsold) 40 41# We also create a special relocatable object that should mirror the symbol 42# table and layout of the linked DSO. With ld --just-symbols we can then 43# refer to these symbols in the kernel code rather than hand-coded addresses. 44 45SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \ 46 -Wl,--build-id -Wl,--hash-style=both 47$(obj)/vdso-dummy.o: $(src)/vdso.lds $(obj)/rt_sigreturn.o FORCE 48 $(call if_changed,vdsold) 49 50LDFLAGS_vdso-syms.o := -r --just-symbols 51$(obj)/vdso-syms.o: $(obj)/vdso-dummy.o FORCE 52 $(call if_changed,ld) 53 54# strip rule for the .so file 55$(obj)/%.so: OBJCOPYFLAGS := -S 56$(obj)/%.so: $(obj)/%.so.dbg FORCE 57 $(call if_changed,objcopy) 58 59# actual build commands 60# The DSO images are built using a special linker script 61# Add -lgcc so rv32 gets static muldi3 and lshrdi3 definitions. 62# Make sure only to export the intended __vdso_xxx symbol offsets. 63quiet_cmd_vdsold = VDSOLD $@ 64 cmd_vdsold = $(CC) $(KBUILD_CFLAGS) $(call cc-option, -no-pie) -nostdlib -nostartfiles $(SYSCFLAGS_$(@F)) \ 65 -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp && \ 66 $(CROSS_COMPILE)objcopy \ 67 $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ 68 rm $@.tmp 69 70# install commands for the unstripped file 71quiet_cmd_vdso_install = INSTALL $@ 72 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 73 74vdso.so: $(obj)/vdso.so.dbg 75 @mkdir -p $(MODLIB)/vdso 76 $(call cmd,vdso_install) 77 78vdso_install: vdso.so 79