/* * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
// Bang the shadow pages if they need to be touched to be mapped. inlinevoid os::map_stack_shadow_pages(address sp) { // Write to each page of our new frame to force OS mapping. // If we decrement stack pointer more than one page // the OS may not map an intervening page into our space // and may fault on a memory access to interior of our frame. constint page_size = os::vm_page_size(); const size_t n_pages = StackOverflow::stack_shadow_zone_size() / page_size; for (size_t pages = 1; pages <= n_pages; pages++) {
sp -= page_size;
*sp = 0;
}
}
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