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