/* $Id: tstLdrObjR0.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
/** @file
 * IPRT - RTLdr test object.
 *
 * We use precompiled versions of this object for testing all the loaders.
 *
 * This is not supposed to be pretty or usable code, just something which
 * make life difficult for the loader.
 */

/*
 * Copyright (C) 2006-2022 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                                                                                                                 *
*********************************************************************************************************************************/
#ifndef IN_RING0
# error "not IN_RING0!"
#endif
#include <VBox/dis.h>
#include <VBox/disopcode.h>
#include <iprt/string.h>


/*********************************************************************************************************************************
*   Global Variables                                                                                                             *
*********************************************************************************************************************************/
static const char szStr1[] = "some readonly string";
static char szStr2[6000] = "some read/write string";
static char achBss[8192];

#ifdef VBOX_SOME_IMPORT_FUNCTION
extern "C" DECLIMPORT(int) SomeImportFunction(void);
#endif


extern "C" DECLEXPORT(int) Entrypoint(void)
{
    strcpy(achBss, szStr2);
    memcpy(achBss, szStr1, sizeof(szStr1));
    memcpy(achBss, (void *)(uintptr_t)&Entrypoint, 32);
#ifdef VBOX_SOME_IMPORT_FUNCTION
    memcpy(achBss, (void *)(uintptr_t)&SomeImportFunction, 32);
    return SomeImportFunction();
#else
    return 0;
#endif
}


extern "C" DECLEXPORT(uint32_t) SomeExportFunction1(void *pvBuf)
{
    NOREF(pvBuf);
    return achBss[0] + achBss[16384];
}


extern "C" DECLEXPORT(char *) SomeExportFunction2(void *pvBuf)
{
    NOREF(pvBuf);
    return (char *)memcpy(achBss, szStr1, sizeof(szStr1));
}


extern "C" DECLEXPORT(char *) SomeExportFunction3(void *pvBuf)
{
    NOREF(pvBuf);
    return (char *)memcpy(achBss, szStr2, strlen(szStr2));
}


extern "C" DECLEXPORT(void *) SomeExportFunction4(void)
{
    static unsigned cb;
    DISCPUSTATE Cpu;

    memset(&Cpu, 0, sizeof(Cpu));

    DISInstr((void *)(uintptr_t)SomeExportFunction3, DISCPUMODE_32BIT, &Cpu, &cb);
    return (void *)(uintptr_t)&SomeExportFunction1;
}


extern "C" DECLEXPORT(uintptr_t) SomeExportFunction5(void)
{
    return (uintptr_t)SomeExportFunction3(NULL) + (uintptr_t)SomeExportFunction2(NULL)
         + (uintptr_t)SomeExportFunction1(NULL) + (uintptr_t)&SomeExportFunction4;
}