1 files changed, 120 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp b/src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp
new file mode 100644
index 00000000..b8f1a1ad
--- /dev/null
+++ b/src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp
@@ -0,0 +1,120 @@
+/* $Id: allocex-r3-posix.cpp $ */
+/** @file
+ * IPRT - Memory Allocation, Extended Alloc Workers, posix.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RTMEM_NO_WRAP_TO_EF_APIS
+#include <iprt/mem.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include "../allocex.h"
+
+#include <sys/mman.h>
+
+
+DECLHIDDEN(int) rtMemAllocEx16BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
+{
+    AssertReturn(cbAlloc < _64K, VERR_NO_MEMORY);
+
+    /*
+     * Try with every possible address hint since the possible range is very limited.
+     */
+    int       fProt     = PROT_READ | PROT_WRITE | (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PROT_EXEC : 0);
+    uintptr_t uAddr     = 0x1000;
+    uintptr_t uAddrLast = _64K - uAddr - cbAlloc;
+    while (uAddr <= uAddrLast)
+    {
+        void *pv = mmap((void *)uAddr, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+        if (pv && (uintptr_t)pv <= uAddrLast)
+        {
+            *ppv = pv;
+            return VINF_SUCCESS;
+        }
+
+        if (pv)
+        {
+            munmap(pv, cbAlloc);
+            pv = NULL;
+        }
+        uAddr += _4K;
+    }
+
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
+{
+    int     fProt = PROT_READ | PROT_WRITE | (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PROT_EXEC : 0);
+#if ARCH_BITS == 32
+    void   *pv = mmap(NULL, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    if (pv)
+    {
+        *ppv = pv;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+
+#elif defined(RT_OS_LINUX)
+# ifdef MAP_32BIT
+    void *pv = mmap(NULL, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
+    if (pv)
+    {
+        *ppv = pv;
+        return VINF_SUCCESS;
+    }
+# endif
+
+    /** @todo On linux, we need an accurate hint. Since I don't need this branch of
+     *        the code right now, I won't bother starting to parse
+     *        /proc/curproc/mmap right now... */
+#else
+#endif
+    return VERR_NOT_SUPPORTED;
+}
+
+
+DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags)
+{
+    RT_NOREF_PV(fFlags);
+    munmap(pv, cb);
+}
+