#!/usr/bin/m4
#
# Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
# Copyright (c) 2015 Elvira Khabirova <lineprinter0@gmail.com>
# Copyright (c) 2015-2018 The strace developers.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

AC_DEFUN([st_MPERS_LOAD_AC_CV], [

pushdef([var], [ac_cv_$1])
pushdef([saved], [saved_ac_cv_$1])
pushdef([mpers], [ac_cv_]mpers_name[_$1])

AS_IF([test -n "${var+set}"], [saved="${var}"; unset var])
AS_IF([test -n "${mpers+set}"], [var="${mpers}"])

popdef([mpers])
popdef([saved])
popdef([var])

])

AC_DEFUN([st_MPERS_SAVE_AC_CV], [

pushdef([var], [ac_cv_$1])
pushdef([saved], [saved_ac_cv_$1])
pushdef([mpers], [ac_cv_]mpers_name[_$1])

AS_IF([test -n "${var+set}"], [mpers="${var}"])
AS_IF([test -n "${saved+set}"], [var="${saved}"; unset saved])

popdef([mpers])
popdef([saved])
popdef([var])

])

AC_DEFUN([st_MPERS_STRUCT_STAT], [

st_MPERS_LOAD_AC_CV([type_struct_stat$1])
AC_CHECK_TYPE([struct stat$1],
	      AC_DEFINE([HAVE_]MPERS_NAME[_STRUCT_STAT$1], [1],
			[Define to 1 if ]mpers_name[ has the type 'struct stat$1'.]),,
[#include <sys/types.h>
#include <asm/stat.h>])
st_MPERS_SAVE_AC_CV([type_struct_stat$1])

st_MPERS_LOAD_AC_CV([member_struct_stat$1_st_mtime_nsec])
AC_CHECK_MEMBER([struct stat$1.st_mtime_nsec],
		AC_DEFINE([HAVE_]MPERS_NAME[_STRUCT_STAT$1_ST_MTIME_NSEC], [1],
			  [Define to 1 if 'st_mtime_nsec' is a member of ]mpers_name[ 'struct stat$1'.]),,
[#include <sys/types.h>
#include <asm/stat.h>])
st_MPERS_SAVE_AC_CV([member_struct_stat$1_st_mtime_nsec])

])

AC_DEFUN([st_MPERS],[

pushdef([mpers_name], [$1])
pushdef([MPERS_NAME], translit([$1], [a-z], [A-Z]))
pushdef([HAVE_MPERS], [HAVE_]MPERS_NAME[_MPERS])
pushdef([HAVE_RUNTIME], [HAVE_]MPERS_NAME[_RUNTIME])
pushdef([MPERS_CFLAGS], [$cc_flags_$1])
pushdef([st_cv_cc], [st_cv_$1_cc])
pushdef([st_cv_runtime], [st_cv_$1_runtime])
pushdef([st_cv_mpers], [st_cv_$1_mpers])

case "$arch" in
	[$2])
	case "$enable_mpers" in
	yes|check|[$1])

	AH_TEMPLATE([HAVE_GNU_STUBS_32_H],
		    [Define to 1 if you have the <gnu/stubs-32.h> header file.])
	AH_TEMPLATE([HAVE_GNU_STUBS_X32_H],
		    [Define to 1 if you have the <gnu/stubs-x32.h> header file.])
	pushdef([gnu_stubs], [gnu/stubs-][m4_substr([$1], 1)][.h])
	AC_CHECK_HEADERS([gnu_stubs], [IFLAG=],
			 [mkdir -p gnu
			  : > gnu_stubs
			  AC_MSG_NOTICE([Created empty gnu_stubs])
			  IFLAG=-I.])
	popdef([gnu_stubs])
	saved_CFLAGS="$CFLAGS"
	CFLAGS="$CFLAGS MPERS_CFLAGS $IFLAG"
	AC_CACHE_CHECK([for mpers_name personality compile support], [st_cv_cc],
		[AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <stdint.h>
						     int main(){return 0;}]])],
				   [st_cv_cc=yes],
				   [st_cv_cc=no])])
	if test $st_cv_cc = yes; then
		AC_CACHE_CHECK([for mpers_name personality runtime support],
			[st_cv_runtime],
			[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdint.h>
							 int main(){return 0;}]])],
				       [st_cv_runtime=yes],
				       [st_cv_runtime=no],
				       [st_cv_runtime=no])])
		AC_CACHE_CHECK([whether mpers.sh mpers_name MPERS_CFLAGS works],
			[st_cv_mpers],
			[if READELF="$READELF" \
			    CC="$CC" CPP="$CPP" CPPFLAGS="$CPPFLAGS $IFLAG" \
			    $srcdir/mpers_test.sh [$1] MPERS_CFLAGS; then
				st_cv_mpers=yes
			 else
				st_cv_mpers=no
			 fi])
		if test $st_cv_mpers = yes; then
			AC_DEFINE(HAVE_MPERS, [1],
				  [Define to 1 if you have mpers_name mpers support])
			st_MPERS_STRUCT_STAT([])
			st_MPERS_STRUCT_STAT([64])

			if test $st_cv_runtime = yes; then
				pushdef([SIZEOF_LONG],
					MPERS_NAME[_SIZEOF_LONG])
				st_MPERS_LOAD_AC_CV([sizeof_long])
				AC_CHECK_SIZEOF([long])
				st_MPERS_SAVE_AC_CV([sizeof_long])
				popdef([SIZEOF_LONG])

				pushdef([SIZEOF_KERNEL_LONG_T],
					MPERS_NAME[_SIZEOF_KERNEL_LONG_T])
				st_MPERS_LOAD_AC_CV([sizeof_kernel_long_t])
				AC_CHECK_SIZEOF([kernel_long_t],,
						[#include "$srcdir/kernel_types.h"])
				st_MPERS_SAVE_AC_CV([sizeof_kernel_long_t])
				popdef([SIZEOF_KERNEL_LONG_T])
			fi
		fi
	fi
	CFLAGS="$saved_CFLAGS"
	;;

	*) # case "$enable_mpers"
	st_cv_runtime=no
	st_cv_mpers=no
	;;
	esac

	test "$st_cv_mpers" = yes ||
		st_cv_mpers=no
	AC_MSG_CHECKING([whether to enable $1 personality support])
	AC_MSG_RESULT([$st_cv_mpers])

	case "$enable_mpers,$st_cv_mpers" in
	yes,no|[$1],no)
		AC_MSG_ERROR([Cannot enable $1 personality support])
		;;
	esac
	;;

	*) # case "$arch"
	st_cv_runtime=no
	st_cv_mpers=no
	;;
esac

AM_CONDITIONAL(HAVE_RUNTIME, [test "$st_cv_mpers$st_cv_runtime" = yesyes])
AM_CONDITIONAL(HAVE_MPERS, [test "$st_cv_mpers" = yes])

popdef([st_cv_mpers])
popdef([st_cv_runtime])
popdef([st_cv_cc])
popdef([MPERS_CFLAGS])
popdef([HAVE_RUNTIME])
popdef([HAVE_MPERS])
popdef([MPERS_NAME])
popdef([mpers_name])

])