/* $Id: kLdrDyldOS.c 2883 2006-11-18 11:21:33Z bird $ */
/** @file
 *
 * kLdr - The Dynamic Loader, OS specific operations.
 *
 * Copyright (c) 2006 knut st. osmundsen <bird@anduin.net>
 *
 *
 * This file is part of kLdr.
 *
 * kLdr 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * kLdr 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 kLdr; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#ifdef __OS2__
# define INCL_BASE
# define INCL_ERRORS
# include <os2.h>
#elif defined(__WIN__)
# include <Windows.h>
#else
# error "port me"
#endif

#include <kLdr.h>
#include "kLdrHlp.h"
#include "kLdrInternal.h"


/**
 * Allocates a stack.
 *
 * @returns Pointer to the stack. NULL on allocation failure (assumes out of memory).
 * @param   cb      The size of the stack. This shall be page aligned.
 *                  If 0, a OS specific default stack size will be employed.
 */
void *kldrDyldOSAllocStack(size_t cb)
{
#ifdef __OS2__
    APIRET rc;
    PVOID pv;

    if (!cb)
        cb = 1 * 1024*1024; /* 1MB */

    rc = DosAllocMem(&pv, cb, OBJ_TILE | PAG_COMMIT | PAG_WRITE | PAG_READ);
    if (rc == NO_ERROR)
        return pv;
    return NULL;

#elif defined(__WIN__)

    if (!cb)
        cb = 1 *1024*1024; /* 1MB */

    return VirtualAlloc(NULL, cb, MEM_COMMIT, PAGE_READWRITE);

#else
# error "Port me"
#endif
}


/**
 * Invokes the main executable entry point with whatever
 * parameters specific to the host OS and/or module format.
 *
 * @returns
 * @param   uMainEPAddress  The address of the main entry point.
 * @param   pvStack         Pointer to the stack object.
 * @param   cbStack         The size of the stack object.
 */
int kldrDyldOSStartExe(uintptr_t uMainEPAddress, void *pvStack, size_t cbStack)
{
#if defined(__OS2__)

#elif defined(__WIN__)
    /*
     * Invoke the entrypoint on the current stack for now.
     * Deal with other formats and stack switching another day.
     */
    int rc;
    int (*pfnEP)(void);
    pfnEP = (int (*)(void))uMainEPAddress;

    rc = pfnEP();

    TerminateProcess(GetCurrentProcess(), rc);
    kldrHlpAssert(!"TerminateProcess failed");
    for (;;)
        TerminateProcess(GetCurrentProcess(), rc);

/*#elif defined(__NT__)*/
#else
# error "Port me"
#endif

    return -1;
}


void kldrDyldDoLoadExeStackSwitch(PKLDRDYLDMOD pExe, void *pvStack, size_t cbStack)
{
    /*kldrHlpAssert(!"not implemented");*/

    /** @todo implement this properly! */
    kldrDyldDoLoadExe(pExe);
}