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 \ 19 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) 20 21SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags) 22 23$(obj)/vsyscall-trapa.so: \ 24$(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE 25 $(call if_changed,syscall) 26 27# We also create a special relocatable object that should mirror the symbol 28# table and layout of the linked DSO. With ld -R we can then refer to 29# these symbols in the kernel code rather than hand-coded addresses. 30SYSCFLAGS_vsyscall-dummy.o = -r 31$(obj)/vsyscall-dummy.o: $(src)/vsyscall.lds \ 32 $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE 33 $(call if_changed,syscall) 34 35LDFLAGS_vsyscall-syms.o := -r -R 36$(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE 37 $(call if_changed,ld) 38