37 lines
1.2 KiB
Makefile
37 lines
1.2 KiB
Makefile
|
obj-y += vsyscall.o vsyscall-syscall.o
|
||
|
|
|
||
|
|
$(obj)/vsyscall-syscall.o: \
|
||
|
|
$(foreach F,trapa,$(obj)/vsyscall-$F.so)
|
||
|
|
|
||
|
|
# Teach kbuild about targets
|
||
|
|
targets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so)
|
||
|
|
targets += vsyscall-note.o vsyscall.lds
|
||
|
|
|
||
|
|
# 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 \
|
||
|
|
$(call ld-option, -Wl$(comma)--hash-style=sysv)
|
||
|
|
|
||
|
|
SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags)
|
||
|
|
|
||
|
|
$(obj)/vsyscall-trapa.so: \
|
||
|
|
$(obj)/vsyscall-%.so: $(src)/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.
|
||
|
|
extra-y += vsyscall-syms.o
|
||
|
|
$(obj)/built-in.o: $(obj)/vsyscall-syms.o
|
||
|
|
$(obj)/built-in.o: ld_flags += -R $(obj)/vsyscall-syms.o
|
||
|
|
|
||
|
|
SYSCFLAGS_vsyscall-syms.o = -r
|
||
|
|
$(obj)/vsyscall-syms.o: $(src)/vsyscall.lds \
|
||
|
|
$(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE
|
||
|
|
$(call if_changed,syscall)
|