| 1 | /** @file
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| 2 | * innotek Portable Runtime - Loader.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2006-2007 innotek GmbH
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License as published by the Free Software Foundation,
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| 12 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 13 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 14 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | */
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| 16 |
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| 17 | #ifndef ___iprt_ldr_h
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| 18 | #define ___iprt_ldr_h
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| 19 |
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| 20 | #include <iprt/cdefs.h>
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| 21 | #include <iprt/types.h>
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| 22 |
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| 23 |
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| 24 | /** @defgroup grp_ldr RTLdr - Loader
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| 25 | * @ingroup grp_rt
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| 26 | * @{
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| 27 | */
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| 28 |
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| 29 | __BEGIN_DECLS
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| 30 |
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| 31 |
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| 32 | /**
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| 33 | * Loads a dynamic load library (/shared object) image file using native
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| 34 | * OS facilities.
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| 35 | *
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| 36 | * The filename will be appended the default DLL/SO extension of
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| 37 | * the platform if it have been omitted. This means that it's not
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| 38 | * possible to load DLLs/SOs with no extension using this interface,
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| 39 | * but that's not a bad tradeoff.
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| 40 | *
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| 41 | * If no path is specified in the filename, the OS will usually search it's library
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| 42 | * path to find the image file.
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| 43 | *
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| 44 | * @returns iprt status code.
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| 45 | * @param pszFilename Image filename.
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| 46 | * @param phLdrMod Where to store the handle to the loader module.
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| 47 | */
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| 48 | RTDECL(int) RTLdrLoad(const char *pszFilename, PRTLDRMOD phLdrMod);
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| 49 |
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| 50 | /**
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| 51 | * Open a binary image file.
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| 52 | *
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| 53 | * @returns iprt status code.
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| 54 | * @param pszFilename Image filename.
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| 55 | * @param phLdrMod Where to store the handle to the loader module.
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| 56 | */
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| 57 | RTDECL(int) RTLdrOpen(const char *pszFilename, PRTLDRMOD phLdrMod);
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| 58 |
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| 59 | /**
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| 60 | * Opens a binary image file using kLdr.
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| 61 | *
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| 62 | * @returns iprt status code.
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| 63 | * @param pszFilename Image filename.
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| 64 | * @param phLdrMod Where to store the handle to the loaded module.
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| 65 | * @remark Primarily for testing the loader.
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| 66 | */
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| 67 | RTDECL(int) RTLdrOpenkLdr(const char *pszFilename, PRTLDRMOD phLdrMod);
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| 68 |
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| 69 | /**
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| 70 | * What to expect and do with the bits passed to RTLdrOpenBits().
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| 71 | */
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| 72 | typedef enum RTLDROPENBITS
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| 73 | {
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| 74 | /** The usual invalid 0 entry. */
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| 75 | RTLDROPENBITS_INVALID = 0,
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| 76 | /** The bits are readonly and will never be changed. */
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| 77 | RTLDROPENBITS_READONLY,
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| 78 | /** The bits are going to be changed and the loader will have to duplicate them
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| 79 | * when opening the image. */
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| 80 | RTLDROPENBITS_WRITABLE,
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| 81 | /** The bits are both the source and destination for the loader operation.
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| 82 | * This means that the loader may have to duplicate them prior to changing them. */
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| 83 | RTLDROPENBITS_SRC_AND_DST,
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| 84 | /** The end of the valid enums. This entry marks the
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| 85 | * first invalid entry.. */
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| 86 | RTLDROPENBITS_END,
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| 87 | RTLDROPENBITS_32BIT_HACK = 0x7fffffff
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| 88 | } RTLDROPENBITS;
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| 89 |
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| 90 | /**
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| 91 | * Open a binary image from in-memory bits.
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| 92 | *
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| 93 | * @returns iprt status code.
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| 94 | * @param pvBits The start of the raw-image.
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| 95 | * @param cbBits The size of the raw-image.
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| 96 | * @param enmBits What to expect from the pvBits.
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| 97 | * @param pszLogName What to call the raw-image when logging.
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| 98 | * For RTLdrLoad and RTLdrOpen the filename is used for this.
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| 99 | * @param phLdrMod Where to store the handle to the loader module.
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| 100 | */
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| 101 | RTDECL(int) RTLdrOpenBits(const void *pvBits, size_t cbBits, RTLDROPENBITS enmBits, const char *pszLogName, PRTLDRMOD phLdrMod);
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| 102 |
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| 103 | /**
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| 104 | * Closes a loader module handle.
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| 105 | *
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| 106 | * The handle can be obtained using any of the RTLdrLoad(), RTLdrOpen()
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| 107 | * and RTLdrOpenBits() functions.
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| 108 | *
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| 109 | * @returns iprt status code.
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| 110 | * @param hLdrMod The loader module handle.
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| 111 | */
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| 112 | RTDECL(int) RTLdrClose(RTLDRMOD hLdrMod);
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| 113 |
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| 114 | /**
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| 115 | * Gets the address of a named exported symbol.
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| 116 | *
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| 117 | * @returns iprt status code.
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| 118 | * @param hLdrMod The loader module handle.
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| 119 | * @param pszSymbol Symbol name.
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| 120 | * @param ppvValue Where to store the symbol value. Note that this is restricted to the
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| 121 | * pointer size used on the host!
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| 122 | */
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| 123 | RTDECL(int) RTLdrGetSymbol(RTLDRMOD hLdrMod, const char *pszSymbol, void **ppvValue);
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| 124 |
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| 125 | /**
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| 126 | * Gets the address of a named exported symbol.
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| 127 | *
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| 128 | * This function differs from the plain one in that it can deal with
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| 129 | * both GC and HC address sizes, and that it can calculate the symbol
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| 130 | * value relative to any given base address.
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| 131 | *
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| 132 | * @returns iprt status code.
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| 133 | * @param hLdrMod The loader module handle.
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| 134 | * @param pvBits Optional pointer to the loaded image.
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| 135 | * Set this to NULL if no RTLdrGetBits() processed image bits are available.
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| 136 | * Not supported for RTLdrLoad() images.
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| 137 | * @param BaseAddress Image load address.
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| 138 | * Not supported for RTLdrLoad() images.
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| 139 | * @param pszSymbol Symbol name.
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| 140 | * @param pValue Where to store the symbol value.
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| 141 | */
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| 142 | RTDECL(int) RTLdrGetSymbolEx(RTLDRMOD hLdrMod, const void *pvBits, RTUINTPTR BaseAddress, const char *pszSymbol, RTUINTPTR *pValue);
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| 143 |
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| 144 | /**
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| 145 | * Gets the size of the loaded image.
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| 146 | * This is only supported for modules which has been opened using RTLdrOpen() and RTLdrOpenBits().
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| 147 | *
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| 148 | * @returns image size (in bytes).
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| 149 | * @returns ~(size_t)0 on if not opened by RTLdrOpen().
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| 150 | * @param hLdrMod Handle to the loader module.
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| 151 | * @remark Not supported for RTLdrLoad() images.
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| 152 | */
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| 153 | RTDECL(size_t) RTLdrSize(RTLDRMOD hLdrMod);
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| 154 |
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| 155 | /**
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| 156 | * Resolve an external symbol during RTLdrGetBits().
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| 157 | *
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| 158 | * @returns iprt status code.
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| 159 | * @param hLdrMod The loader module handle.
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| 160 | * @param pszModule Module name.
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| 161 | * @param pszSymbol Symbol name, NULL if uSymbol should be used.
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| 162 | * @param uSymbol Symbol ordinal, ~0 if pszSymbol should be used.
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| 163 | * @param pValue Where to store the symbol value (address).
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| 164 | * @param pvUser User argument.
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| 165 | */
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| 166 | typedef DECLCALLBACK(int) RTLDRIMPORT(RTLDRMOD hLdrMod, const char *pszModule, const char *pszSymbol, unsigned uSymbol, RTUINTPTR *pValue, void *pvUser);
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| 167 | /** Pointer to a FNRTLDRIMPORT() callback function. */
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| 168 | typedef RTLDRIMPORT *PFNRTLDRIMPORT;
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| 169 |
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| 170 | /**
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| 171 | * Loads the image into a buffer provided by the user and applies fixups
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| 172 | * for the given base address.
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| 173 | *
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| 174 | * @returns iprt status code.
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| 175 | * @param hLdrMod The load module handle.
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| 176 | * @param pvBits Where to put the bits.
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| 177 | * Must be as large as RTLdrSize() suggests.
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| 178 | * @param BaseAddress The base address.
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| 179 | * @param pfnGetImport Callback function for resolving imports one by one.
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| 180 | * @param pvUser User argument for the callback.
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| 181 | * @remark Not supported for RTLdrLoad() images.
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| 182 | */
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| 183 | RTDECL(int) RTLdrGetBits(RTLDRMOD hLdrMod, void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser);
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| 184 |
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| 185 | /**
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| 186 | * Relocates bits after getting them.
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| 187 | * Useful for code which moves around a bit.
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| 188 | *
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| 189 | * @returns iprt status code.
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| 190 | * @param hLdrMod The loader module handle.
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| 191 | * @param pvBits Where the image bits are.
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| 192 | * Must've been passed to RTLdrGetBits().
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| 193 | * @param NewBaseAddress The new base address.
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| 194 | * @param OldBaseAddress The old base address.
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| 195 | * @param pfnGetImport Callback function for resolving imports one by one.
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| 196 | * @param pvUser User argument for the callback.
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| 197 | * @remark Not supported for RTLdrLoad() images.
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| 198 | */
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| 199 | RTDECL(int) RTLdrRelocate(RTLDRMOD hLdrMod, void *pvBits, RTUINTPTR NewBaseAddress, RTUINTPTR OldBaseAddress,
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| 200 | PFNRTLDRIMPORT pfnGetImport, void *pvUser);
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| 201 |
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| 202 | /**
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| 203 | * Enumeration callback function used by RTLdrEnumSymbols().
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| 204 | *
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| 205 | * @returns iprt status code. Failure will stop the enumeration.
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| 206 | * @param hLdrMod The loader module handle.
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| 207 | * @param pszSymbol Symbol name. NULL if ordinal only.
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| 208 | * @param uSymbol Symbol ordinal, ~0 if not used.
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| 209 | * @param Value Symbol value.
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| 210 | * @param pvUser The user argument specified to RTLdrEnumSymbols().
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| 211 | */
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| 212 | typedef DECLCALLBACK(int) RTLDRENUMSYMS(RTLDRMOD hLdrMod, const char *pszSymbol, unsigned uSymbol, RTUINTPTR Value, void *pvUser);
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| 213 | /** Pointer to a RTLDRENUMSYMS() callback function. */
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| 214 | typedef RTLDRENUMSYMS *PFNRTLDRENUMSYMS;
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| 215 |
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| 216 | /**
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| 217 | * Enumerates all symbols in a module.
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| 218 | *
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| 219 | * @returns iprt status code.
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| 220 | * @param hLdrMod The loader module handle.
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| 221 | * @param fFlags Flags indicating what to return and such.
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| 222 | * @param pvBits Optional pointer to the loaded image. (RTLDR_ENUM_SYMBOL_FLAGS_*)
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| 223 | * Set this to NULL if no RTLdrGetBits() processed image bits are available.
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| 224 | * @param BaseAddress Image load address.
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| 225 | * @param pfnCallback Callback function.
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| 226 | * @param pvUser User argument for the callback.
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| 227 | * @remark Not supported for RTLdrLoad() images.
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| 228 | */
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| 229 | RTDECL(int) RTLdrEnumSymbols(RTLDRMOD hLdrMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress, PFNRTLDRENUMSYMS pfnCallback, void *pvUser);
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| 230 |
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| 231 | /** @name RTLdrEnumSymbols flags.
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| 232 | * @{ */
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| 233 | /** Returns ALL kinds of symbols. The default is to only return public/exported symbols. */
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| 234 | #define RTLDR_ENUM_SYMBOL_FLAGS_ALL RT_BIT(1)
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| 235 | /** @} */
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| 236 |
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| 237 | __END_DECLS
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| 238 |
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| 239 | /** @} */
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| 240 |
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| 241 | #endif
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| 242 |
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