ldr.h revision 3e6c6998d1dfeded8b9a23f5aa94ad63e9a681d9
/** @file
* innotek Portable Runtime - Loader.
*/
/*
* Copyright (C) 2006-2007 innotek GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License 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.
*/
#ifndef ___iprt_ldr_h
#define ___iprt_ldr_h
/** @defgroup grp_ldr RTLdr - Loader
* @ingroup grp_rt
* @{
*/
/**
* Loads a dynamic load library (/shared object) image file using native
* OS facilities.
*
* the platform if it have been omitted. This means that it's not
* but that's not a bad tradeoff.
*
* If no path is specified in the filename, the OS will usually search it's library
* path to find the image file.
*
* @returns iprt status code.
* @param pszFilename Image filename.
* @param phLdrMod Where to store the handle to the loader module.
*/
/**
* Open a binary image file.
*
* @returns iprt status code.
* @param pszFilename Image filename.
* @param phLdrMod Where to store the handle to the loader module.
*/
/**
* Opens a binary image file using kLdr.
*
* @returns iprt status code.
* @param pszFilename Image filename.
* @param phLdrMod Where to store the handle to the loaded module.
* @remark Primarily for testing the loader.
*/
/**
* What to expect and do with the bits passed to RTLdrOpenBits().
*/
typedef enum RTLDROPENBITS
{
/** The usual invalid 0 entry. */
/** The bits are readonly and will never be changed. */
/** The bits are going to be changed and the loader will have to duplicate them
* when opening the image. */
/** The bits are both the source and destination for the loader operation.
* This means that the loader may have to duplicate them prior to changing them. */
/** The end of the valid enums. This entry marks the
* first invalid entry.. */
RTLDROPENBITS_32BIT_HACK = 0x7fffffff
/**
* Open a binary image from in-memory bits.
*
* @returns iprt status code.
* @param pvBits The start of the raw-image.
* @param cbBits The size of the raw-image.
* @param enmBits What to expect from the pvBits.
* @param pszLogName What to call the raw-image when logging.
* For RTLdrLoad and RTLdrOpen the filename is used for this.
* @param phLdrMod Where to store the handle to the loader module.
*/
RTDECL(int) RTLdrOpenBits(const void *pvBits, size_t cbBits, RTLDROPENBITS enmBits, const char *pszLogName, PRTLDRMOD phLdrMod);
/**
* 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.
*/
/**
* 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!
*/
/**
* Gets the address of a named exported symbol.
*
* This function differs from the plain one in that it can deal with
* both GC and HC address sizes, and that it can calculate the symbol
* value relative to any given base address.
*
* @returns iprt status code.
* @param hLdrMod The loader module handle.
* @param pvBits Optional pointer to the loaded image.
* Set this to NULL if no RTLdrGetBits() processed image bits are available.
* Not supported for RTLdrLoad() images.
* @param BaseAddress Image load address.
* Not supported for RTLdrLoad() images.
* @param pszSymbol Symbol name.
* @param pValue Where to store the symbol value.
*/
RTDECL(int) RTLdrGetSymbolEx(RTLDRMOD hLdrMod, const void *pvBits, RTUINTPTR BaseAddress, const char *pszSymbol, RTUINTPTR *pValue);
/**
* Gets the size of the loaded image.
* This is only supported for modules which has been opened using RTLdrOpen() and RTLdrOpenBits().
*
* @returns image size (in bytes).
* @returns ~(size_t)0 on if not opened by RTLdrOpen().
* @param hLdrMod Handle to the loader module.
* @remark Not supported for RTLdrLoad() images.
*/
/**
* Resolve an external symbol during RTLdrGetBits().
*
* @returns iprt status code.
* @param hLdrMod The loader module handle.
* @param pszModule Module name.
* @param pszSymbol Symbol name, NULL if uSymbol should be used.
* @param uSymbol Symbol ordinal, ~0 if pszSymbol should be used.
* @param pValue Where to store the symbol value (address).
* @param pvUser User argument.
*/
typedef DECLCALLBACK(int) RTLDRIMPORT(RTLDRMOD hLdrMod, const char *pszModule, const char *pszSymbol, unsigned uSymbol, RTUINTPTR *pValue, void *pvUser);
/** Pointer to a FNRTLDRIMPORT() callback function. */
typedef RTLDRIMPORT *PFNRTLDRIMPORT;
/**
* Loads the image into a buffer provided by the user and applies fixups
* for the given base address.
*
* @returns iprt status code.
* @param hLdrMod The load module handle.
* @param pvBits Where to put the bits.
* Must be as large as RTLdrSize() suggests.
* @param BaseAddress The base address.
* @param pfnGetImport Callback function for resolving imports one by one.
* @param pvUser User argument for the callback.
* @remark Not supported for RTLdrLoad() images.
*/
RTDECL(int) RTLdrGetBits(RTLDRMOD hLdrMod, void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser);
/**
* Relocates bits after getting them.
* Useful for code which moves around a bit.
*
* @returns iprt status code.
* @param hLdrMod The loader module handle.
* @param pvBits Where the image bits are.
* Must've been passed to RTLdrGetBits().
* @param NewBaseAddress The new base address.
* @param OldBaseAddress The old base address.
* @param pfnGetImport Callback function for resolving imports one by one.
* @param pvUser User argument for the callback.
* @remark Not supported for RTLdrLoad() images.
*/
RTDECL(int) RTLdrRelocate(RTLDRMOD hLdrMod, void *pvBits, RTUINTPTR NewBaseAddress, RTUINTPTR OldBaseAddress,
/**
* Enumeration callback function used by RTLdrEnumSymbols().
*
* @returns iprt status code. Failure will stop the enumeration.
* @param hLdrMod The loader module handle.
* @param pszSymbol Symbol name. NULL if ordinal only.
* @param uSymbol Symbol ordinal, ~0 if not used.
* @param Value Symbol value.
* @param pvUser The user argument specified to RTLdrEnumSymbols().
*/
typedef DECLCALLBACK(int) RTLDRENUMSYMS(RTLDRMOD hLdrMod, const char *pszSymbol, unsigned uSymbol, RTUINTPTR Value, void *pvUser);
/** Pointer to a RTLDRENUMSYMS() callback function. */
typedef RTLDRENUMSYMS *PFNRTLDRENUMSYMS;
/**
* Enumerates all symbols in a module.
*
* @returns iprt status code.
* @param hLdrMod The loader module handle.
* @param fFlags Flags indicating what to return and such.
* @param pvBits Optional pointer to the loaded image. (RTLDR_ENUM_SYMBOL_FLAGS_*)
* Set this to NULL if no RTLdrGetBits() processed image bits are available.
* @param BaseAddress Image load address.
* @param pfnCallback Callback function.
* @param pvUser User argument for the callback.
* @remark Not supported for RTLdrLoad() images.
*/
RTDECL(int) RTLdrEnumSymbols(RTLDRMOD hLdrMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRENUMSYMS pfnCallback, void *pvUser);
/** @name RTLdrEnumSymbols flags.
* @{ */
/** @} */
/** @} */
#endif