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: $(src)/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: $(src)/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