1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 28f5ef7c7SNicholas Pigginobj-y += vsyscall.o vsyscall-syscall.o vsyscall-syms.o 319f9a34fSPaul Mundt 419f9a34fSPaul Mundt$(obj)/vsyscall-syscall.o: \ 519f9a34fSPaul Mundt $(foreach F,trapa,$(obj)/vsyscall-$F.so) 619f9a34fSPaul Mundt 719f9a34fSPaul Mundt# Teach kbuild about targets 819f9a34fSPaul Mundttargets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so) 98f5ef7c7SNicholas Piggintargets += vsyscall-note.o vsyscall.lds vsyscall-dummy.o 1019f9a34fSPaul Mundt 1119f9a34fSPaul Mundt# The DSO images are built using a special linker script 1219f9a34fSPaul Mundtquiet_cmd_syscall = SYSCALL $@ 1319f9a34fSPaul Mundt cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \ 1419f9a34fSPaul Mundt -Wl,-T,$(filter-out FORCE,$^) -o $@ 1519f9a34fSPaul Mundt 1619f9a34fSPaul Mundtexport CPPFLAGS_vsyscall.lds += -P -C -Ush 1719f9a34fSPaul Mundt 18*5b13f841SNick Desaulniersvsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 -Wl,--hash-style=sysv 1919f9a34fSPaul Mundt 2019f9a34fSPaul MundtSYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags) 2119f9a34fSPaul Mundt 2219f9a34fSPaul Mundt$(obj)/vsyscall-trapa.so: \ 2319f9a34fSPaul Mundt$(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE 2419f9a34fSPaul Mundt $(call if_changed,syscall) 2519f9a34fSPaul Mundt 2619f9a34fSPaul Mundt# We also create a special relocatable object that should mirror the symbol 2719f9a34fSPaul Mundt# table and layout of the linked DSO. With ld -R we can then refer to 2819f9a34fSPaul Mundt# these symbols in the kernel code rather than hand-coded addresses. 298f5ef7c7SNicholas PigginSYSCFLAGS_vsyscall-dummy.o = -r 308f5ef7c7SNicholas Piggin$(obj)/vsyscall-dummy.o: $(src)/vsyscall.lds \ 3119f9a34fSPaul Mundt $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE 3219f9a34fSPaul Mundt $(call if_changed,syscall) 338f5ef7c7SNicholas Piggin 348f5ef7c7SNicholas PigginLDFLAGS_vsyscall-syms.o := -r -R 358f5ef7c7SNicholas Piggin$(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE 368f5ef7c7SNicholas Piggin $(call if_changed,ld) 37