1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #include "precompiled.hpp"
  25 #include "gc/z/zSyscall_windows.hpp"
  26 #include "logging/log.hpp"
  27 #include "runtime/java.hpp"
  28 #include "runtime/os.hpp"
  29 
  30 ZSyscall::CreateFileMappingWFn ZSyscall::CreateFileMappingW;
  31 ZSyscall::VirtualAlloc2Fn ZSyscall::VirtualAlloc2;
  32 ZSyscall::VirtualFreeExFn ZSyscall::VirtualFreeEx;
  33 ZSyscall::MapViewOfFile3Fn ZSyscall::MapViewOfFile3;
  34 ZSyscall::UnmapViewOfFile2Fn ZSyscall::UnmapViewOfFile2;
  35 
  36 template <typename Fn>
  37 static void lookup_symbol(Fn*& fn, const char* library, const char* symbol) {
  38   char ebuf[1024];
  39   void* const handle = os::dll_load(library, ebuf, sizeof(ebuf));
  40   if (handle == NULL) {
  41     log_error(gc)("Failed to load library: %s", library);
  42     vm_exit_during_initialization("ZGC requires Windows version 1803 or later");
  43   }
  44 
  45   fn = reinterpret_cast<Fn*>(os::dll_lookup(handle, symbol));
  46   if (fn == NULL) {
  47     log_error(gc)("Failed to lookup symbol: %s", symbol);
  48     vm_exit_during_initialization("ZGC requires Windows version 1803 or later");
  49   }
  50 }
  51 
  52 void ZSyscall::initialize() {
  53   lookup_symbol(CreateFileMappingW, "KernelBase", "CreateFileMappingW");
  54   lookup_symbol(VirtualAlloc2,      "KernelBase", "VirtualAlloc2");
  55   lookup_symbol(VirtualFreeEx,      "KernelBase", "VirtualFreeEx");
  56   lookup_symbol(MapViewOfFile3,     "KernelBase", "MapViewOfFile3");
  57   lookup_symbol(UnmapViewOfFile2,   "KernelBase", "UnmapViewOfFile2");
  58 }