/* $Id: ldr.h 8245 2008-04-21 17:24:28Z vboxsync $ */ /** @file * IPRT - Loader Internals. */ /* * 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. */ #ifndef ___internal_ldr_h #define ___internal_ldr_h #include #include "internal/magics.h" __BEGIN_DECLS /******************************************************************************* * Defined Constants And Macros * *******************************************************************************/ #ifdef __DOXYGEN__ /** @def LDR_WITH_NATIVE * Define this to get native support. */ # define LDR_WITH_NATIVE /** @def LDR_WITH_ELF32 * Define this to get 32-bit ELF support. */ # define LDR_WITH_ELF32 /** @def LDR_WITH_ELF64 * Define this to get 64-bit ELF support. */ # define LDR_WITH_ELF64 /** @def LDR_WITH_PE * Define this to get 32-bit and 64-bit PE support. */ # define LDR_WITH_PE /** @def LDR_WITH_LX * Define this to get LX support. */ # define LDR_WITH_LX /** @def LDR_WITH_MACHO * Define this to get mach-o support (not implemented yet). */ # define LDR_WITH_MACHO #endif /* __DOXYGEN__ */ #if defined(LDR_WITH_ELF32) || defined(LDR_WITH_ELF64) /** @def LDR_WITH_ELF * This is defined if any of the ELF versions is requested. */ # define LDR_WITH_ELF #endif /* These two may clash with winnt.h. */ #undef IMAGE_DOS_SIGNATURE #undef IMAGE_NT_SIGNATURE /** Little endian uint32_t ELF signature ("\x7fELF"). */ #define IMAGE_ELF_SIGNATURE (0x7f | ('E' << 8) | ('L' << 16) | ('F' << 24)) /** Little endian uint32_t PE signature ("PE\0\0"). */ #define IMAGE_NT_SIGNATURE 0x00004550 /** Little endian uint16_t LX signature ("LX") */ #define IMAGE_LX_SIGNATURE ('L' | ('X' << 8)) /** Little endian uint16_t LE signature ("LE") */ #define IMAGE_LE_SIGNATURE ('L' | ('E' << 8)) /** Little endian uint16_t NE signature ("NE") */ #define IMAGE_NE_SIGNATURE ('N' | ('E' << 8)) /** Little endian uint16_t MZ signature ("MZ"). */ #define IMAGE_DOS_SIGNATURE ('M' | ('Z' << 8)) /******************************************************************************* * Structures and Typedefs * *******************************************************************************/ /** * Loader state. */ typedef enum RTLDRSTATE { /** Invalid. */ LDR_STATE_INVALID = 0, /** Opened. */ LDR_STATE_OPENED, /** The image can no longer be relocated. */ LDR_STATE_DONE, /** The image was loaded, not opened. */ LDR_STATE_LOADED, /** The usual 32-bit hack. */ LDR_STATE_32BIT_HACK = 0x7fffffff } RTLDRSTATE; /** Pointer to a loader item. */ typedef struct RTLDRMODINTERNAL *PRTLDRMODINTERNAL; /** * Loader module operations. */ typedef struct RTLDROPS { /** The name of the executable format. */ const char *pszName; /** * Release any resources attached to the module. * The caller will do RTMemFree on pMod on return. * * @returns iprt status code. * @param pMod Pointer to the loader module structure. * @remark Compulsory entry point. */ DECLCALLBACKMEMBER(int, pfnClose)(PRTLDRMODINTERNAL pMod); /** * Gets a simple symbol. * This entrypoint can be omitted if RTLDROPS::pfnGetSymbolEx() is provided. * * @returns iprt status code. * @param pMod Pointer to the loader module structure. * @param pszSymbol The symbol name. * @param ppvValue Where to store the symbol value. */ DECLCALLBACKMEMBER(int, pfnGetSymbol)(PRTLDRMODINTERNAL pMod, const char *pszSymbol, void **ppvValue); /** * Called when we're done with getting bits and relocating them. * This is used to release resources used by the loader to support those actions. * * After this call none of the extended loader functions can be called. * * @returns iprt status code. * @param pMod Pointer to the loader module structure. * @remark This is an optional entry point. */ DECLCALLBACKMEMBER(int, pfnDone)(PRTLDRMODINTERNAL pMod); /** * Enumerates the symbols exported by the module. * * @returns iprt status code, which might have been returned by pfnCallback. * @param pMod Pointer to the loader module structure. * @param fFlags Flags indicating what to return and such. * @param pvBits Pointer to the bits returned by RTLDROPS::pfnGetBits(), optional. * @param BaseAddress The image base addressto use when calculating the symbol values. * @param pfnCallback The callback function which each symbol is to be feeded to. * @param pvUser User argument to pass to the enumerator. * @remark This is an optional entry point. */ DECLCALLBACKMEMBER(int, pfnEnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRENUMSYMS pfnCallback, void *pvUser); /* extended functions: */ /** * Gets the size of the loaded image (i.e. in memory). * * @returns in memory size, in bytes. * @returns ~(size_t)0 if it's not an extended image. * @param pMod Pointer to the loader module structure. * @remark Extended loader feature. */ DECLCALLBACKMEMBER(size_t, pfnGetImageSize)(PRTLDRMODINTERNAL pMod); /** * Gets the image bits fixed up for a specified address. * * @returns iprt status code. * @param pMod Pointer to the loader module structure. * @param pvBits Where to store the bits. The size of this buffer is equal or * larger to the value returned by pfnGetImageSize(). * @param BaseAddress The base address which the image should be fixed up to. * @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals). * @param pvUser User argument to pass to the callback. * @remark Extended loader feature. */ DECLCALLBACKMEMBER(int, pfnGetBits)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser); /** * Relocate bits obtained using pfnGetBits to a new address. * * @returns iprt status code. * @param pMod Pointer to the loader module structure. * @param pvBits Where to store the bits. The size of this buffer is equal or * larger to the value returned by pfnGetImageSize(). * @param NewBaseAddress The base address which the image should be fixed up to. * @param OldBaseAddress The base address which the image is currently fixed up to. * @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals). * @param pvUser User argument to pass to the callback. * @remark Extended loader feature. */ DECLCALLBACKMEMBER(int, pfnRelocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress, RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser); /** * Gets a symbol with special base address and stuff. * This entrypoint can be omitted if RTLDROPS::pfnGetSymbolEx() is provided and the special BaseAddress feature isn't supported. * * @returns iprt status code. * @param pMod Pointer to the loader module structure. * @param pvBits Pointer to bits returned by RTLDROPS::pfnGetBits(), optional. * @param BaseAddress The image base address to use when calculating the symbol value. * @param pszSymbol The symbol name. * @param pValue Where to store the symbol value. * @remark Extended loader feature. */ DECLCALLBACKMEMBER(int, pfnGetSymbolEx)(PRTLDRMODINTERNAL pMod, const void *pvBits, RTUINTPTR BaseAddress, const char *pszSymbol, RTUINTPTR *pValue); /** Dummy entry to make sure we've initialized it all. */ RTUINT uDummy; } RTLDROPS; typedef RTLDROPS *PRTLDROPS; typedef const RTLDROPS *PCRTLDROPS; /** Pointer to a loader reader instance. */ typedef struct RTLDRREADER *PRTLDRREADER; /** * Loader image reader instance. * The reader will have extra data members following this structure. */ typedef struct RTLDRREADER { /** The name of the image provider. */ const char *pszName; /** * Reads bytes at a give place in the raw image. * * @returns iprt status code. * @param pReader Pointer to the reader instance. * @param pvBuf Where to store the bits. * @param cb Number of bytes to read. * @param off Where to start reading relative to the start of the raw image. */ DECLCALLBACKMEMBER(int, pfnRead)(PRTLDRREADER pReader, void *pvBuf, size_t cb, RTFOFF off); /** * Tells end position of last read. * * @returns position relative to start of the raw image. * @param pReader Pointer to the reader instance. */ DECLCALLBACKMEMBER(RTFOFF, pfnTell)(PRTLDRREADER pReader); /** * Gets the size of the raw image bits. * * @returns size of raw image bits in bytes. * @param pReader Pointer to the reader instance. */ DECLCALLBACKMEMBER(RTFOFF, pfnSize)(PRTLDRREADER pReader); /** * Map the bits into memory. * * The mapping will be freed upon calling pfnDestroy() if not pfnUnmap() * is called before that. The mapping is read only. * * @returns iprt status code. * @param pReader Pointer to the reader instance. * @param ppvBits Where to store the address of the memory mapping on success. * The size of the mapping can be obtained by calling pfnSize(). */ DECLCALLBACKMEMBER(int, pfnMap)(PRTLDRREADER pReader, const void **ppvBits); /** * Unmap bits. * * @returns iprt status code. * @param pReader Pointer to the reader instance. * @param pvBits Memory pointer returned by pfnMap(). */ DECLCALLBACKMEMBER(int, pfnUnmap)(PRTLDRREADER pReader, const void *pvBits); /** * Gets the most appropriate log name. * * @returns Pointer to readonly log name. * @param pReader Pointer to the reader instance. */ DECLCALLBACKMEMBER(const char *, pfnLogName)(PRTLDRREADER pReader); /** * Releases all resources associated with the reader instance. * The instance is invalid after this call returns. * * @returns iprt status code. * @param pReader Pointer to the reader instance. */ DECLCALLBACKMEMBER(int, pfnDestroy)(PRTLDRREADER pReader); } RTLDRREADER; /** * Loader module core. */ typedef struct RTLDRMODINTERNAL { /** The loader magic value (RTLDRMOD_MAGIC). */ uint32_t u32Magic; /** State. */ RTLDRSTATE eState; /** Loader ops. */ PCRTLDROPS pOps; } RTLDRMODINTERNAL; /** * Validates that a loader module handle is valid. * * @returns true if valid. * @returns false if invalid. * @param hLdrMod The loader module handle. */ DECLINLINE(bool) rtldrIsValid(RTLDRMOD hLdrMod) { return VALID_PTR(hLdrMod) && ((PRTLDRMODINTERNAL)hLdrMod)->u32Magic == RTLDRMOD_MAGIC; } int rtldrOpenWithReader(PRTLDRREADER pReader, PRTLDRMOD phMod); /** * Native loader module. */ typedef struct RTLDRMODNATIVE { /** The core structure. */ RTLDRMODINTERNAL Core; /** The native handle. */ uintptr_t hNative; } RTLDRMODNATIVE, *PRTLDRMODNATIVE; /** @copydoc RTLDROPS::pfnGetSymbol */ DECLCALLBACK(int) rtldrNativeGetSymbol(PRTLDRMODINTERNAL pMod, const char *pszSymbol, void **ppvValue); /** @copydoc RTLDROPS::pfnClose */ DECLCALLBACK(int) rtldrNativeClose(PRTLDRMODINTERNAL pMod); /** * Load a native module using the native loader. * * @returns iprt status code. * @param pszFilename The image filename. * @param phHandle Where to store the module handle on success. */ int rtldrNativeLoad(const char *pszFilename, uintptr_t *phHandle); int rtldrPEOpen(PRTLDRREADER pReader, RTFOFF offNtHdrs, PRTLDRMOD phLdrMod); int rtldrELFOpen(PRTLDRREADER pReader, PRTLDRMOD phLdrMod); int rtldrkLdrOpen(PRTLDRREADER pReader, PRTLDRMOD phLdrMod); /*int rtldrLXOpen(PRTLDRREADER pReader, RTFOFF offLX, PRTLDRMOD phLdrMod); int rtldrMachoOpen(PRTLDRREADER pReader, RTFOFF offSomething, PRTLDRMOD phLdrMod);*/ __END_DECLS #endif