1# SPDX-License-Identifier: GPL-2.0 2obj-y += vsyscall.o vsyscall-syscall.o vsyscall-syms.o 3 4$(obj)/vsyscall-syscall.o: $(obj)/vsyscall-trapa.so 5 6# Teach kbuild about targets 7targets += vsyscall-trapa.o vsyscall-traps.so 8targets += vsyscall-note.o vsyscall.lds vsyscall-dummy.o 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 -Wl,--hash-style=sysv 18 19SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags) 20 21$(obj)/vsyscall-trapa.so: \ 22$(obj)/vsyscall-%.so: $(obj)/vsyscall.lds $(obj)/vsyscall-%.o FORCE 23 $(call if_changed,syscall) 24 25# We also create a special relocatable object that should mirror the symbol 26# table and layout of the linked DSO. With ld -R we can then refer to 27# these symbols in the kernel code rather than hand-coded addresses. 28SYSCFLAGS_vsyscall-dummy.o = -r 29$(obj)/vsyscall-dummy.o: $(obj)/vsyscall.lds \ 30 $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE 31 $(call if_changed,syscall) 32 33LDFLAGS_vsyscall-syms.o := -r -R 34$(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE 35 $(call if_changed,ld) 36