1obj-y += vsyscall.o vsyscall-syscall.o 2 3$(obj)/vsyscall-syscall.o: \ 4 $(foreach F,trapa,$(obj)/vsyscall-$F.so) 5 6# Teach kbuild about targets 7targets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so) 8targets += vsyscall-note.o vsyscall.lds 9 10# The DSO images are built using a special linker script 11quiet_cmd_syscall = SYSCALL $@ 12 cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \ 13 -Wl,-T,$(filter-out FORCE,$^) -o $@ 14 15export CPPFLAGS_vsyscall.lds += -P -C -Ush 16 17vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 \ 18 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) 19 20SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags) 21 22$(obj)/vsyscall-trapa.so: \ 23$(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE 24 $(call if_changed,syscall) 25 26# We also create a special relocatable object that should mirror the symbol 27# table and layout of the linked DSO. With ld -R we can then refer to 28# these symbols in the kernel code rather than hand-coded addresses. 29extra-y += vsyscall-syms.o 30$(obj)/built-in.o: $(obj)/vsyscall-syms.o 31$(obj)/built-in.o: ld_flags += -R $(obj)/vsyscall-syms.o 32 33SYSCFLAGS_vsyscall-syms.o = -r 34$(obj)/vsyscall-syms.o: $(src)/vsyscall.lds \ 35 $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE 36 $(call if_changed,syscall) 37