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