# Copyright (C) 1991-2018 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

# <http://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