b957df3b85
These are generated files. Prefix them with $(obj)/ instead of $(src)/. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Helge Deller <deller@gmx.de> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
1.2 KiB
SPDX-License-Identifier: GPL-2.0
obj-y += vsyscall.o vsyscall-syscall.o vsyscall-syms.o
$(obj)/vsyscall-syscall.o: $(obj)/vsyscall-trapa.so
Teach kbuild about targets
targets += vsyscall-trapa.o vsyscall-traps.so targets += vsyscall-note.o vsyscall.lds vsyscall-dummy.o
The DSO images are built using a special linker script
quiet_cmd_syscall = SYSCALL $@
cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F))
-Wl,-T,$(filter-out FORCE,$^) -o $@
export CPPFLAGS_vsyscall.lds += -P -C -Ush
vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 -Wl,--hash-style=sysv
SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags)
$(obj)/vsyscall-trapa.so:
$(obj)/vsyscall-%.so: $(obj)/vsyscall.lds $(obj)/vsyscall-%.o FORCE
$(call if_changed,syscall)
We also create a special relocatable object that should mirror the symbol
table and layout of the linked DSO. With ld -R we can then refer to
these symbols in the kernel code rather than hand-coded addresses.
SYSCFLAGS_vsyscall-dummy.o = -r
$(obj)/vsyscall-dummy.o: $(obj)/vsyscall.lds
$(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE
$(call if_changed,syscall)
LDFLAGS_vsyscall-syms.o := -r -R $(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE $(call if_changed,ld)