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/* $Id: ldr.cpp $ */
/** @file
* IPRT - Binary Image Loader.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_LDR
#include <iprt/ldr.h>
#include <iprt/alloc.h>
#include <iprt/string.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/log.h>
#include "internal/ldr.h"
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
typedef struct RTLDRREADERFILE
{
/** The core. */
RTLDRREADER Core;
/** The file. */
RTFILE File;
/** The file size. */
RTFOFF cbFile;
/** The current offset. */
RTFOFF off;
/** The filename (variable size). */
char szFilename[1];
} RTLDRREADERFILE, *PRTLDRREADERFILE;
/**
* Checks if a library is loadable or not.
*
* This may attempt load and unload the library.
*
* @returns true/false accordingly.
* @param pszFilename Image filename.
*/
RTDECL(bool) RTLdrIsLoadable(const char *pszFilename)
{
/*
* Try to load the library.
*/
RTLDRMOD hLib;
int rc = RTLdrLoad(pszFilename, &hLib);
if (RT_SUCCESS(rc))
{
RTLdrClose(hLib);
return true;
}
return false;
}
/**
* Gets the address of a named exported symbol.
*
* @returns iprt status code.
* @param hLdrMod The loader module handle.
* @param pszSymbol Symbol name.
* @param ppvValue Where to store the symbol value. Note that this is restricted to the
* pointer size used on the host!
*/
RTDECL(int) RTLdrGetSymbol(RTLDRMOD hLdrMod, const char *pszSymbol, void **ppvValue)
{
LogFlow(("RTLdrGetSymbol: hLdrMod=%RTldrm pszSymbol=%p:{%s} ppvValue=%p\n",
hLdrMod, pszSymbol, pszSymbol, ppvValue));
/*
* Validate input.
*/
AssertMsgReturn(rtldrIsValid(hLdrMod), ("hLdrMod=%p\n", hLdrMod), VERR_INVALID_HANDLE);
AssertMsgReturn(pszSymbol, ("pszSymbol=%p\n", pszSymbol), VERR_INVALID_PARAMETER);
AssertMsgReturn(VALID_PTR(ppvValue), ("ppvValue=%p\n", ppvValue), VERR_INVALID_PARAMETER);
PRTLDRMODINTERNAL pMod = (PRTLDRMODINTERNAL)hLdrMod;
//AssertMsgReturn(pMod->eState == LDR_STATE_OPENED, ("eState=%d\n", pMod->eState), VERR_WRONG_ORDER);
/*
* Do it.
*/
int rc;
if (pMod->pOps->pfnGetSymbol)
rc = pMod->pOps->pfnGetSymbol(pMod, pszSymbol, ppvValue);
else
{
RTUINTPTR Value = 0;
rc = pMod->pOps->pfnGetSymbolEx(pMod, NULL, 0, pszSymbol, &Value);
if (RT_SUCCESS(rc))
{
*ppvValue = (void *)Value;
if ((uintptr_t)*ppvValue != Value)
rc = VERR_BUFFER_OVERFLOW;
}
}
LogFlow(("RTLdrGetSymbol: return %Rrc *ppvValue=%p\n", rc, *ppvValue));
return rc;
}
/**
* Closes a loader module handle.
*
* The handle can be obtained using any of the RTLdrLoad(), RTLdrOpen()
* and RTLdrOpenBits() functions.
*
* @returns iprt status code.
* @param hLdrMod The loader module handle.
*/
RTDECL(int) RTLdrClose(RTLDRMOD hLdrMod)
{
LogFlow(("RTLdrClose: hLdrMod=%RTldrm\n", hLdrMod));
/*
* Validate input.
*/
AssertMsgReturn(rtldrIsValid(hLdrMod), ("hLdrMod=%p\n", hLdrMod), VERR_INVALID_HANDLE);
PRTLDRMODINTERNAL pMod = (PRTLDRMODINTERNAL)hLdrMod;
//AssertMsgReturn(pMod->eState == LDR_STATE_OPENED, ("eState=%d\n", pMod->eState), VERR_WRONG_ORDER);
/*
* Do it.
*/
int rc = pMod->pOps->pfnClose(pMod);
AssertRC(rc);
pMod->eState = LDR_STATE_INVALID;
pMod->u32Magic++;
RTMemFree(pMod);
LogFlow(("RTLdrClose: returns VINF_SUCCESS\n"));
return VINF_SUCCESS;
}
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