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