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110 lines
3.9 KiB
Makefile
110 lines
3.9 KiB
Makefile
# Copyright (C) 1991-2023 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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ifndef inhibit-unix-syscalls
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# Sysdep dirs unix/... can contain a file syscalls.list,
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# which specifies objects to be compiled as simple Unix system calls.
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-include $(common-objpfx)sysd-syscalls
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ifeq (misc,$(subdir))
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sysdep_routines += $(unix-extra-syscalls)
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ifdef unix-stub-syscalls
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# The system call entry points in this list are supposed to be additional
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# functions not overriding any other sysdeps/.../call.c implementation, but
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# their system call numbers are unavailable in the kernel headers we're
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# using. Instead of a system call stub, these get a function that fails
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# with ENOSYS. We just generate a single module defining one function and
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# making all these entry point names aliases for it.
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sysdep_routines += stub-syscalls
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$(objpfx)stub-syscalls.c: $(common-objpfx)sysd-syscalls \
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$(..)sysdeps/unix/Makefile
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$(make-target-directory)
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(for call in $(unix-stub-syscalls); do \
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call=$${call%%@*}; \
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echo "#define $$call RENAMED_$$call"; \
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done; \
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echo '#include <errno.h>'; \
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echo '#include <shlib-compat.h>'; \
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for call in $(unix-stub-syscalls); do \
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call=$${call%%@*}; \
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echo "#undef $$call"; \
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done; \
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echo 'long int _no_syscall (void)'; \
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echo '{ __set_errno (ENOSYS); return -1L; }'; \
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for call in $(unix-stub-syscalls); do \
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case $$call in \
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*@@*) \
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ver=$${call##*@}; call=$${call%%@*}; \
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ver=`echo "$$ver" | sed 's/\./_/g'`; \
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echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
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echo "versioned_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"\
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;; \
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*@*) \
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ver=$${call##*@}; call=$${call%%@*}; \
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ver=`echo "$$ver" | sed 's/\./_/g'`; \
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case $$ver in \
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*:*) \
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compat_ver=$${ver#*:}; \
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ver=$${ver%%:*}; \
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compat_cond="SHLIB_COMPAT (libc, $$ver, $$compat_ver)"; \
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;; \
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*) \
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compat_cond=""; \
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;; \
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esac; \
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if [ -n "$$compat_cond" ]; then echo "#if $$compat_cond"; fi; \
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echo "strong_alias (_no_syscall, __$${call}_$${ver})"; \
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echo "compat_symbol (libc, __$${call}_$${ver}, $$call, $$ver);"; \
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if [ -n "$$compat_cond" ]; then echo "#endif"; fi; \
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;; \
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*) echo "weak_alias (_no_syscall, $$call)"; \
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echo "stub_warning ($$call)"; \
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echo "weak_alias (_no_syscall, __GI_$$call)" ;; \
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esac; \
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done) > $@T
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mv -f $@T $@
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generated += stub-syscalls.c
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endif
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endif
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# This is the end of the pipeline for compiling the syscall stubs.
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# The stdin is assembler with cpp using sysdep.h macros.
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compile-syscall = $(COMPILE.S) -o $@ -x assembler-with-cpp - \
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$(compile-mkdep-flags)
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ifndef avoid-generated
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$(common-objpfx)sysd-syscalls: $(..)sysdeps/unix/make-syscalls.sh \
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$(wildcard $(+sysdep_dirs:%=%/syscalls.list)) \
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$(wildcard $(+sysdep_dirs:%=%/arch-syscall.h)) \
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$(common-objpfx)libc-modules.stmp
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for dir in $(+sysdep_dirs); do \
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test -f $$dir/syscalls.list && \
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{ sysdirs='$(sysdirs)' \
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asm_CPP='$(COMPILE.S) -E -x assembler-with-cpp' \
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$(SHELL) $(dir $<)$(notdir $<) $$dir || exit 1; }; \
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test $$dir = $(..)sysdeps/unix && break; \
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done > $@T
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mv -f $@T $@
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endif
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postclean-generated += sysd-syscalls
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endif
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