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# Copyright (C) 1991-2020 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.
ifndef inhibit-unix-syscalls
# Sysdep dirs unix/... can contain a file syscalls.list,
# which specifies objects to be compiled as simple Unix system calls.
-include $(common-objpfx)sysd-syscalls
ifeq (misc,$(subdir))
sysdep_routines += $(unix-extra-syscalls)
ifdef unix-stub-syscalls
# The system call entry points in this list are supposed to be additional
# functions not overriding any other sysdeps/.../call.c implementation, but
# their system call numbers are unavailable in the kernel headers we're
# using. Instead of a system call stub, these get a function that fails
# with ENOSYS. We just generate a single module defining one function and
# making all these entry point names aliases for it.
sysdep_routines += stub-syscalls
$(objpfx)stub-syscalls.c: $(common-objpfx)sysd-syscalls \
$(..)sysdeps/unix/Makefile
$(make-target-directory)
(for call in $(unix-stub-syscalls); do \
call=$${call%%@*}; \
echo "#define $$call RENAMED_$$call"; \
done; \
echo '#include <errno.h>'; \
echo '#include <shlib-compat.h>'; \
for call in $(unix-stub-syscalls); do \
call=$${call%%@*}; \
echo "#undef $$call"; \
done; \
echo 'long int _no_syscall (void)'; \
echo '{ __set_errno (ENOSYS); return -1L; }'; \
for call in $(unix-stub-syscalls); do \
case $$call in \
*@@*) \
ver=$${call##*@}; call=$${call%%@*}; \
ver=`echo "$$ver" | sed 's/\./_/g'`; \
echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
echo "versioned_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"\
;; \
*@*) \
ver=$${call##*@}; call=$${call%%@*}; \
ver=`echo "$$ver" | sed 's/\./_/g'`; \
case $$ver in \
*:*) \
compat_ver=$${ver#*:}; \
ver=$${ver%%:*}; \
compat_cond="SHLIB_COMPAT (libc, $$ver, $$compat_ver)"; \
;; \
*) \
compat_cond=""; \
;; \
esac; \
if [ -n "$$compat_cond" ]; then echo "#if $$compat_cond"; fi; \
echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
echo "compat_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"; \
if [ -n "$$compat_cond" ]; then echo "#endif"; fi; \
;; \
*) echo "weak_alias (_no_syscall, $$call)"; \
echo "stub_warning ($$call)"; \
echo "weak_alias (_no_syscall, __GI_$$call)" ;; \
esac; \
done) > $@T
mv -f $@T $@
generated += stub-syscalls.c
endif
endif
# This is the end of the pipeline for compiling the syscall stubs.
# The stdin is assembler with cpp using sysdep.h macros.
compile-syscall = $(COMPILE.S) -o $@ -x assembler-with-cpp - \
$(compile-mkdep-flags)
ifndef avoid-generated
$(common-objpfx)sysd-syscalls: $(..)sysdeps/unix/make-syscalls.sh \
$(wildcard $(+sysdep_dirs:%=%/syscalls.list)) \
$(common-objpfx)libc-modules.stmp
for dir in $(+sysdep_dirs); do \
test -f $$dir/syscalls.list && \
{ sysdirs='$(sysdirs)' \
asm_CPP='$(COMPILE.S) -E -x assembler-with-cpp' \
$(SHELL) $(dir $<)$(notdir $<) $$dir || exit 1; }; \
test $$dir = $(..)sysdeps/unix && break; \
done > $@T
mv -f $@T $@
endif
$(common-objpfx)s-%.d: $(..)sysdeps/unix/s-%.S \
$(wildcard $(+sysdep_dirs:%=%/syscalls.list))
$(+make-deps)
postclean-generated += sysd-syscalls
endif
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