1# SPDX-License-Identifier: GPL-2.0 2obj-y += vsyscall.o vsyscall-syscall.o vsyscall-syms.o 3 4$(obj)/vsyscall-syscall.o: \ 5 $(foreach F,trapa,$(obj)/vsyscall-$F.so) 6 7# Teach kbuild about targets 8targets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so) 9targets += vsyscall-note.o vsyscall.lds vsyscall-dummy.o 10 11# The DSO images are built using a special linker script 12quiet_cmd_syscall = SYSCALL $@ 13 cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \ 14 -Wl,-T,$(filter-out FORCE,$^) -o $@ 15 16export CPPFLAGS_vsyscall.lds += -P -C -Ush 17 18vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 -Wl,--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 $(call if_changed,syscall) 25 26# We also create a special relocatable object that should mirror the symbol 27# table and layout of the linked DSO. With ld -R we can then refer to 28# these symbols in the kernel code rather than hand-coded addresses. 29SYSCFLAGS_vsyscall-dummy.o = -r 30$(obj)/vsyscall-dummy.o: $(src)/vsyscall.lds \ 31 $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE 32 $(call if_changed,syscall) 33 34LDFLAGS_vsyscall-syms.o := -r -R 35$(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE 36 $(call if_changed,ld) 37