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1 # Copyright (C) 1991-2024 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 # <https://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 \
41 echo
"#define $$call RENAMED_$$call"; \
43 echo
'#include <errno.h>'; \
44 echo
'#include <shlib-compat.h>'; \
45 for call in
$(unix-stub-syscalls
); do \
47 echo
"#undef $$call"; \
49 echo
'long int _no_syscall (void)'; \
50 echo
'{ __set_errno (ENOSYS); return -1L; }'; \
51 for call in
$(unix-stub-syscalls
); do \
54 ver
=$${call
##*@}; call=$${call%%@*}; \
55 ver
=`echo "$$ver" | sed 's/\./_/g'`; \
56 echo
"strong_alias (_no_syscall, __$${call}_$${ver})"; \
57 echo
"versioned_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"\
60 ver
=$${call
##*@}; call=$${call%%@*}; \
61 ver
=`echo "$$ver" | sed 's/\./_/g'`; \
64 compat_ver
=$${ver
#*:}; \
66 compat_cond
="SHLIB_COMPAT (libc, $$ver, $$compat_ver)"; \
72 if
[ -n
"$$compat_cond" ]; then echo
"#if $$compat_cond"; fi
; \
73 echo
"strong_alias (_no_syscall, __$${call}_$${ver})"; \
74 echo
"compat_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"; \
75 if
[ -n
"$$compat_cond" ]; then echo
"#endif"; fi
; \
77 *) echo
"weak_alias (_no_syscall, $$call)"; \
78 echo
"stub_warning ($$call)"; \
79 echo
"weak_alias (_no_syscall, __GI_$$call)" ;; \
83 generated
+= stub-syscalls.c
87 # This is the end of the pipeline for compiling the syscall stubs.
88 # The stdin is assembler with cpp using sysdep.h macros.
89 compile-syscall
= $(COMPILE.S
) -o
$@
-x assembler-with-cpp
- \
90 $(compile-mkdep-flags
)
92 ifndef avoid-generated
93 $(common-objpfx
)sysd-syscalls
: $(..
)sysdeps
/unix
/make-syscalls.sh \
94 $(wildcard $(+sysdep_dirs
:%=%/syscalls.list
)) \
95 $(wildcard $(+sysdep_dirs
:%=%/arch-syscall.h
)) \
96 $(common-objpfx
)libc-modules.stmp
97 for
dir in
$(+sysdep_dirs
); do \
98 test -f
$$dir/syscalls.list
&& \
99 { sysdirs
='$(sysdirs)' \
100 asm_CPP
='$(COMPILE.S) -E -x assembler-with-cpp' \
101 $(SHELL
) $(dir $<)$(notdir $<) $$dir || exit
1; }; \
102 test $$dir = $(..
)sysdeps
/unix
&& break
; \
107 postclean-generated
+= sysd-syscalls
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