1 # Copyright (C) 1991-2012 Free Software Foundation, Inc.
2 # This file is part of the GNU C Library.
4 # The GNU C Library is free software; you can redistribute it and/or
5 # modify it under the terms of the GNU Lesser General Public
6 # License as published by the Free Software Foundation; either
7 # version 2.1 of the License, or (at your option) any later version.
9 # The GNU C Library is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 # Lesser General Public License for more details.
14 # You should have received a copy of the GNU Lesser General Public
15 # License along with the GNU C Library; if not, see
16 # <http://www.gnu.org/licenses/>.
18 ifndef inhibit-unix-syscalls
20 # Sysdep dirs unix/... can contain a file syscalls.list,
21 # which specifies objects to be compiled as simple Unix system calls.
23 -include $(common-objpfx
)sysd-syscalls
26 sysdep_routines
+= $(unix-extra-syscalls
)
28 ifdef unix-stub-syscalls
29 # The system call entry points in this list are supposed to be additional
30 # functions not overriding any other sysdeps/.../call.c implementation, but
31 # their system call numbers are unavailable in the kernel headers we're
32 # using. Instead of a system call stub, these get a function that fails
33 # with ENOSYS. We just generate a single module defining one function and
34 # making all these entry point names aliases for it.
35 sysdep_routines
+= stub-syscalls
36 $(objpfx
)stub-syscalls.c
: $(common-objpfx
)sysd-syscalls \
37 $(..
)sysdeps
/unix
/Makefile
38 $(make-target-directory
)
39 (for call in
$(unix-stub-syscalls
); do \
40 echo
"#define $$call RENAMED_$$call"; \
42 echo
'#include <errno.h>'; \
43 for call in
$(unix-stub-syscalls
); do \
44 echo
"#undef $$call"; \
46 echo
'long int _no_syscall (void)'; \
47 echo
'{ __set_errno (ENOSYS); return -1L; }'; \
48 for call in
$(unix-stub-syscalls
); do \
50 *@@
*) ver
=$${call
##*@}; call=$${call%%*@}; \
51 echo
"strong_alias (_no_syscall, $${call}_$${ver})"; \
52 echo
"default_symbol_version \
53 ($${call}_$${ver}, $$call, $$ver);" ;; \
54 *@
*) ver
=$${call
##*@}; call=$${call%%*@}; \
55 echo
"strong_alias (_no_syscall, $${call}_$${ver})"; \
56 echo
"symbol_version ($${call}_$${ver}, $$call, $$ver);" ;; \
57 *) echo
"weak_alias (_no_syscall, $$call)"; \
58 echo
"stub_warning ($$call)"; \
59 echo
"weak_alias (_no_syscall, __GI_$$call)" ;; \
61 echo
'#include <stub-tag.h>'; \
64 generated
+= stub-syscalls.c
68 # This is the end of the pipeline for compiling the syscall stubs.
69 # The stdin is assembler with cpp using sysdep.h macros.
70 compile-syscall
= $(COMPILE.S
) -o
$@
-x assembler-with-cpp
- \
71 $(compile-mkdep-flags
)
73 ifndef avoid-generated
74 $(common-objpfx
)sysd-syscalls
: $(..
)sysdeps
/unix
/make-syscalls.sh \
75 $(wildcard $(+sysdep_dirs
:%=%/syscalls.list
))
76 for
dir in
$(+sysdep_dirs
); do \
77 test -f
$$dir/syscalls.list
&& \
78 { sysdirs
='$(sysdirs)' \
79 asm_CPP
='$(COMPILE.S) -E -x assembler-with-cpp' \
80 $(SHELL
) $(dir $<)$(notdir $<) $$dir || exit
1; }; \
81 test $$dir = $(..
)sysdeps
/unix
&& break
; \
86 # The $(bppfx)syscall.ob objects depend on s-proto-bp.d, which are
87 # generated to specify dependencies generated BP stubs have on headers.
88 # These deps use file names relative to a subdir, so don't
89 # include them in the parent directory.
90 ifneq (,$(filter $(unix-syscalls
),$(routines
) $(sysdep_routines
) $(aux
)))
92 -include $(common-objpfx
)s-proto-bp.d
96 $(common-objpfx
)s-
%.d
: $(..
)sysdeps
/unix
/s-
%.S \
97 $(wildcard $(+sysdep_dirs
:%=%/syscalls.list
))
100 common-generated
+= s-proto-bp.d
101 postclean-generated
+= sysd-syscalls