| 1 | /* $Id: kLdr.h 2830 2006-10-23 20:53:11Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * kLdr - The Dynamic Loader.
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| 5 | *
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| 6 | * Copyright (c) 2006 knut st. osmundsen <bird@anduin.net>
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| 7 | *
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| 8 | *
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| 9 | * This file is part of kLdr.
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| 10 | *
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| 11 | * kLdr is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * kLdr is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | * GNU General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with kLdr; if not, write to the Free Software
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| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 24 | *
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| 25 | */
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| 26 |
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| 27 | #ifndef __kLdr_h__
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| 28 | #define __kLdr_h__
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| 29 |
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| 30 | #ifdef __cplusplus
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| 31 | extern "C" {
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| 32 | #endif
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| 33 |
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| 34 | /* kLdr depend on size_t, [u]intNN_t, [u]intptr_t and some related constants. */
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| 35 | #include <sys/types.h>
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| 36 | #include <stddef.h>
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| 37 | #ifdef _MSC_VER
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| 38 | typedef signed char int8_t;
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| 39 | typedef unsigned char uint8_t;
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| 40 | typedef signed short int16_t;
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| 41 | typedef unsigned short uint16_t;
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| 42 | typedef signed int int32_t;
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| 43 | typedef unsigned int uint32_t;
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| 44 | typedef signed __int64 int64_t;
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| 45 | typedef unsigned __int64 uint64_t;
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| 46 | typedef uint64_t uintmax_t;
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| 47 | #else
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| 48 | # include <stdint.h>
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| 49 | #endif
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| 50 |
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| 51 |
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| 52 | /** @defgroup grp_kLdrRdr kLdrRdr - The file provider
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| 53 | * @{ */
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| 54 |
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| 55 | typedef enum KLDRPROT
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| 56 | {
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| 57 | /** The usual invalid 0. */
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| 58 | KLDRPROT_INVALID = 0,
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| 59 | /** No access (page not present). */
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| 60 | KLDRPROT_NOACCESS,
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| 61 | /** Read only. */
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| 62 | KLDRPROT_READONLY,
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| 63 | /** Read & write. */
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| 64 | KLDRPROT_READWRITE,
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| 65 | /** Read & copy on write. */
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| 66 | KLDRPROT_WRITECOPY,
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| 67 | /** Execute only. */
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| 68 | KLDRPROT_EXECUTE,
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| 69 | /** Execute & read. */
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| 70 | KLDRPROT_EXECUTE_READ,
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| 71 | /** Execute, read & write. */
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| 72 | KLDRPROT_EXECUTE_READWRITE,
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| 73 | /** Execute, read & copy on write. */
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| 74 | KLDRPROT_EXECUTE_WRITECOPY,
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| 75 | /** The usual end value. (exclusive) */
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| 76 | KLDRPROT_END,
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| 77 | /** Blow the type up to 32-bits. */
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| 78 | KLDRPROT_32BIT_HACK = 0x7fffffff
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| 79 | } KLDRPROT;
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| 80 |
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| 81 |
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| 82 | /** Pointer to a file provider instance core. */
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| 83 | typedef struct KLDRRDR *PKLDRRDR;
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| 84 | /** Pointer to a file provider instance core pointer. */
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| 85 | typedef struct KLDRRDR **PPKLDRRDR;
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| 86 |
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| 87 | /**
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| 88 | * File provider instance operations.
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| 89 | */
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| 90 | typedef struct KLDRRDROPS
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| 91 | {
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| 92 | /** The name of this file provider. */
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| 93 | const char *pszName;
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| 94 | /** Pointer to the next file provider. */
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| 95 | const struct KLDRRDROPS *pNext;
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| 96 |
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| 97 | /** Try create a new file provider instance.
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| 98 | *
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| 99 | * @returns 0 on success, OS specific error code on failure.
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| 100 | * @param ppRdr Where to store the file provider instance.
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| 101 | * @param pszFilename The filename to open.
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| 102 | */
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| 103 | int (* pfnCreate)( PPKLDRRDR ppRdr, const char *pszFilename);
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| 104 | /** Destroy the file provider instance.
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| 105 | *
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| 106 | * @returns 0 on success, OS specific error code on failure.
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| 107 | * On failure, the file provider instance will be in an indeterminate state - don't touch it!
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| 108 | * @param pRdr The file provider instance.
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| 109 | */
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| 110 | int (* pfnDestroy)( PKLDRRDR pRdr);
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| 111 | /** Read bits from the file.
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| 112 | *
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| 113 | * @returns 0 on success, OS specific error code on failure.
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| 114 | * @param pRdr The file provider instance.
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| 115 | * @param pvBuf Where to put the bits.
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| 116 | * @param cb The number of bytes to read.
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| 117 | * @param off Where to start reading.
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| 118 | */
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| 119 | int (* pfnRead)( PKLDRRDR pRdr, void *pvBuf, size_t cb, off_t off);
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| 120 | /** Map all the file bits into memory (read only).
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| 121 | *
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| 122 | * @returns 0 on success, OS specific error code on failure.
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| 123 | * @param pRdr The file provider instance.
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| 124 | * @param ppvBits Where to store the address of the mapping.
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| 125 | * The size can be obtained using pfnSize.
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| 126 | */
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| 127 | int (* pfnAllMap)( PKLDRRDR pRdr, const void **ppvBits);
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| 128 | /** Unmap a file bits mapping obtained by KLDRRDROPS::pfnAllMap.
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| 129 | *
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| 130 | * @returns 0 on success, OS specific error code on failure.
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| 131 | * @param pRdr The file provider instance.
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| 132 | * @param pvBits The mapping address.
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| 133 | */
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| 134 | int (* pfnAllUnmap)(PKLDRRDR pRdr, const void *pvBits);
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| 135 | /** Get the file size.
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| 136 | *
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| 137 | * @returns The file size. Returns -1 on failure.
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| 138 | * @param pRdr The file provider instance.
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| 139 | */
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| 140 | off_t (* pfnSize)( PKLDRRDR pRdr);
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| 141 | /** Get the file pointer offset.
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| 142 | *
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| 143 | * @returns The file pointer offset. Returns -1 on failure.
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| 144 | * @param pRdr The file provider instance.
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| 145 | */
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| 146 | off_t (* pfnTell)( PKLDRRDR pRdr);
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| 147 | /** Get the file name.
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| 148 | *
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| 149 | * @returns The file size. Returns -1 on failure.
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| 150 | * @param pRdr The file provider instance.
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| 151 | */
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| 152 | const char * (* pfnName)(PKLDRRDR pRdr);
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| 153 | /**
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| 154 | * Prepares a memory region to map file sections into.
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| 155 | *
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| 156 | * @returns 0 on success, OS specific error code on failure.
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| 157 | * @param pRdr The file provider instance.
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| 158 | * @param ppv If fFixed is set, *ppv contains the memory location which
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| 159 | * the region should be based at. If fFixed is clear the OS
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| 160 | * is free to choose the location.
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| 161 | * On successful return *ppv contains address of the prepared
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| 162 | * memory region.
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| 163 | * @param cb The size of the memory region to prepare.
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| 164 | * @param fFixed When set *ppv will contain the desired region address.
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| 165 | *
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| 166 | */
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| 167 | int (* pfnPrepare)(PKLDRRDR pRdr, void **ppv, size_t cb, unsigned fFixed);
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| 168 | /**
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| 169 | * Maps a section of the file into the memory region reserved by pfnPrepare.
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| 170 | *
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| 171 | * @returns 0 on success, OS specific error code on failure.
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| 172 | * @param pRdr The file provider instance.
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| 173 | * @param pv The address in the prepared region.
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| 174 | * @param cb The size of the memory mapping.
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| 175 | * @param enmProt The desired memory protection.
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| 176 | * @param offFile The start of the raw file bytes.
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| 177 | * @param cbFile The number of raw file bytes. This must be less or equal to cb.
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| 178 | */
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| 179 | int (* pfnMap)(PKLDRRDR pRdr, void *pv, size_t cb, KLDRPROT enmProt, off_t offFile, size_t cbFile);
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| 180 | /**
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| 181 | * Changes the page protection of a section mapped using pfnMap.
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| 182 | *
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| 183 | * This is typically used for applying fixups and similar.
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| 184 | *
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| 185 | * @returns 0 on success, OS specific error code on failure.
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| 186 | * @param pRdr The file provider instance.
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| 187 | * @param pv The address passed to pfnMap.
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| 188 | * @param cb The size passed to pfnMap.
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| 189 | * @param enmProt The desired memory protection.
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| 190 | */
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| 191 | int (* pfnProtect)(PKLDRRDR pRdr, void *pv, size_t cb, KLDRPROT enmProt);
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| 192 | /**
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| 193 | * Unmaps a section of the file previously mapped using pfnMap.
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| 194 | *
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| 195 | * @returns 0 on success, OS specific error code on failure.
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| 196 | * @param pRdr The file provider instance.
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| 197 | * @param pv The address passed to pfnMap.
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| 198 | * @param cb The size passed to pfnMap.
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| 199 | */
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| 200 | int (* pfnUnmap)(PKLDRRDR pRdr, void *pv, size_t cb);
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| 201 | /**
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| 202 | * Releases the memory region prepared by pfnPrepare().
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| 203 | *
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| 204 | * Before calling this function, all sections mapped by pfnMap must first be unmapped by calling pfnUnmap.
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| 205 | *
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| 206 | * @returns 0 on success, OS specific error code on failure.
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| 207 | * @param pRdr The file provider instance.
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| 208 | * @param pv The address of the prepared region.
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| 209 | * @param cb The size of the prepared region.
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| 210 | */
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| 211 | int (* pfnUnprepare)(PKLDRRDR pRdr, void *pv, size_t cb);
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| 212 | /**
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| 213 | * We're done reading from the file but would like to keep file mappings.
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| 214 | *
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| 215 | * If the OS support closing the file handle while the file is mapped,
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| 216 | * the reader should do so.
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| 217 | *
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| 218 | * @param pRdr The file provider instance.
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| 219 | */
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| 220 | void (* pfnDone)(PKLDRRDR pRdr);
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| 221 | /** The usual non-zero dummy that makes sure we've initialized all members. */
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| 222 | uint32_t u32Dummy;
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| 223 | } KLDRRDROPS;
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| 224 | /** Pointer to file provider operations. */
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| 225 | typedef KLDRRDROPS *PKLDRRDROPS;
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| 226 | /** Pointer to const file provider operations. */
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| 227 | typedef const KLDRRDROPS *PCKLDRRDROPS;
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| 228 |
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| 229 |
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| 230 | /**
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| 231 | * File provider instance core.
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| 232 | */
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| 233 | typedef struct KLDRRDR
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| 234 | {
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| 235 | /** Pointer to the file provider operations. */
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| 236 | PCKLDRRDROPS pOps;
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| 237 | } KLDRRDR;
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| 238 |
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| 239 | void kLdrRdrAddProvider(PKLDRRDROPS pAdd);
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| 240 |
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| 241 | int kLdrRdrOpen( PPKLDRRDR ppRdr, const char *pszFilename);
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| 242 | int kLdrRdrClose( PKLDRRDR pRdr);
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| 243 | int kLdrRdrRead( PKLDRRDR pRdr, void *pvBuf, size_t cb, off_t off);
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| 244 | int kLdrRdrAllMap( PKLDRRDR pRdr, const void **ppvBits);
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| 245 | int kLdrRdrAllUnmap(PKLDRRDR pRdr, const void *pvBits);
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| 246 | off_t kLdrRdrSize( PKLDRRDR pRdr);
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| 247 | off_t kLdrRdrTell( PKLDRRDR pRdr);
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| 248 | const char *kLdrRdrName(PKLDRRDR pRdr);
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| 249 |
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| 250 | /** @} */
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| 251 |
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| 252 |
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| 253 |
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| 254 | /** @defgroup grp_kLdrMod kLdrMod - The executable image intepreter
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| 255 | * @{ */
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| 256 |
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| 257 | /**
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| 258 | * Loader segment.
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| 259 | */
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| 260 | typedef struct KLDRSEG
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| 261 | {
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| 262 | /** The segment load address. */
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| 263 | void *pv;
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| 264 | /** The size of the segment. */
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| 265 | size_t cb;
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| 266 | /** The segment is readable. */
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| 267 | uint32_t fRead : 1;
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| 268 | /** The segment is writable. */
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| 269 | uint32_t fWrite : 1;
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| 270 | /** The segment is executable. */
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| 271 | uint32_t fExecute : 1;
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| 272 | /** Reserved for future use. */
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| 273 | uint32_t fReserved : 29;
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| 274 | /** Reserved for future use. */
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| 275 | uint32_t u32Reserved;
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| 276 | } KLDRSEG, *PKLDRSEG;
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| 277 |
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| 278 |
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| 279 | /**
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| 280 | * Loader module type.
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| 281 | */
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| 282 | typedef enum KLDRTYPE
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| 283 | {
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| 284 | /** The usual invalid 0 type. */
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| 285 | KLDRTYPE_INVALID = 0,
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| 286 | /** The native OS loader. */
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| 287 | KLDRTYPE_NATIVE,
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| 288 | /** The LX loader. */
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| 289 | KLDRTYPE_LX,
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| 290 | /** The end type (not included). */
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| 291 | KLDRTYPE_END,
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| 292 | /** Hack to blow the type up to 32-bit. */
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| 293 | KLDRTYPE_32BIT_HACK = 0x7fffffff
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| 294 | } KLDRTYPE;
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| 295 |
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| 296 |
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| 297 | /**
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| 298 | * Loader module.
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| 299 | */
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| 300 | typedef struct KLDRMOD
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| 301 | {
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| 302 | /** Magic number. */
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| 303 | uint32_t u32Magic;
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| 304 | /** The type of module this is. */
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| 305 | KLDRTYPE enmType;
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| 306 | /** The module data. */
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| 307 | void *pvData;
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| 308 | /** The filename length (bytes). */
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| 309 | uint32_t cchFilename;
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| 310 | /** The filename. */
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| 311 | const char *pszFilename;
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| 312 | /** The module name. */
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| 313 | const char *pszName;
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| 314 | /** The module name length (bytes). */
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| 315 | uint32_t cchName;
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| 316 | /** The number of segments in the module. */
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| 317 | uint32_t cSegments;
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| 318 | /** Segments. (variable size, can be zero) */
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| 319 | KLDRSEG aSegments[1];
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| 320 | } KLDRMOD, *PKLDRMOD, **PPKLDRMOD;
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| 321 |
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| 322 |
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| 323 | int kLdrModOpen(const char *pszFilename, PPKLDRMOD ppMod);
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| 324 | int kLdrModClose(PKLDRMOD pMod);
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| 325 | int kLdrModGetSymbol(PKLDRMOD pMod, const void *pvBits, uintmax_t BaseAddress, const char *pszSymbol, uintmax_t *pValue, unsigned *pfType);
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| 326 | int kLdrModGetSymbol(PKLDRMOD pMod, const void *pvBits, uintmax_t BaseAddress, const char *pszSymbol, uintmax_t *pValue, unsigned *pfType);
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| 327 |
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| 328 | size_t kLdrModSize(PKLDRMOD pMod);
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| 329 |
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| 330 | typedef int FNKLDRMODGETIMPORT(PKLDRMOD pMod, const char *pszModule, const char *pszSymbol, unsigned uSymbol, uintmax_t *pValue, void *pvUser);
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| 331 | typedef FNKLDRMODGETIMPORT *PFNKLDRMODGETIMPORT;
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| 332 | int kLdrModGetBits(PKLDRMOD pMod, void *pvBits, uintmax_t BaseAddress, PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
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| 333 | int kLdrModRelocate(PKLDRMOD pMod, void *pvBits, uintmax_t NewBaseAddress, uintmax_t OldBaseAddress, PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
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| 334 |
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| 335 | typedef int FNKLDRMODENUMSYMS(PKLDRMOD pMod, const char *pszSymbol, unsigned uSymbol, uintmax_t Value, void *pvUser);
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| 336 | typedef FNKLDRMODENUMSYMS *PFNKLDRMODENUMSYMS;
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| 337 | int kLdrModEnumSymbols(PKLDRMOD pMod, unsigned fFlags, const void *pvBits, uintmax_t BaseAddress, PFNKLDRMODENUMSYMS pfnCallback, void *pvUser);
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| 338 | /** @name kLdrModEnumSymbols flags.
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| 339 | * @{ */
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| 340 | /** Returns ALL kinds of symbols. The default is to only return public/exported symbols. */
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| 341 | #define KLDRMOD_ENUM_SYMBOL_FLAGS_ALL 0x00000001
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| 342 | /** @} */
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| 343 |
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| 344 | /** @} */
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| 345 |
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| 346 |
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| 347 |
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| 348 |
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| 349 | /** @defgroup grp_kLdrDy kLdrDy - The dynamic loader
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| 350 | * @{ */
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| 351 |
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| 352 | /** The h*/
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| 353 | typedef struct KLDRDY *PKLDRDY;
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| 354 |
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| 355 | /*
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| 356 | int kLdrLoadDll(const char *pszFilename, unsigned fFlags, unsigned long *pvmod);
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| 357 | */
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| 358 |
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| 359 | /** @name Process Bootstrapping
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| 360 | * @{ */
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| 361 |
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| 362 | /**
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| 363 | * Argument package from the stub.
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| 364 | */
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| 365 | typedef struct KLDREXEARGS
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| 366 | {
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| 367 | /** Flags. (Currently unused, MBZ.) */
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| 368 | uint32_t fFlags;
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| 369 | /** The executable file that the stub is supposed to load. */
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| 370 | char szExecutable[260];
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| 371 | /** The LD_LIBRARY_PATH prefix for the process.. */
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| 372 | char szLibPath[4096 - 260 - sizeof(uint32_t)];
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| 373 | } KLDREXEARGS, *PKLDREXEARGS;
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| 374 |
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| 375 | void kLdrLoadExe(PKLDREXEARGS pArgs);
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| 376 | /** @} */
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| 377 |
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| 378 | /** @} */
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| 379 |
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| 380 |
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| 381 | /** @defgroup grp_kLdrErr kLdr Status Codes
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| 382 | * kLdr uses a mix of native status codes and it's own status codes.
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| 383 | * A status code of 0 means success, all other status codes means failure.
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| 384 | * @{
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| 385 | */
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| 386 | #ifdef __OS2__
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| 387 | # define KLDR_ERR_BASE 0x7face000
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| 388 | #elif defined(__WIN__)
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| 389 | # define KLDR_ERR_BASE 0x7face000
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| 390 | #else
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| 391 | # error "port me"
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| 392 | #endif
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| 393 | /** The image format is unknown. */
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| 394 | #define KLDR_ERR_UNKNOWN_FORMAT (KLDR_ERR_BASE + 0)
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| 395 | /** The MZ image format isn't supported by this kLdr build. */
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| 396 | #define KLDR_ERR_MZ_NOT_SUPPORTED (KLDR_ERR_BASE + 1)
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| 397 | /** The NE image format isn't supported by this kLdr build. */
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| 398 | #define KLDR_ERR_NE_NOT_SUPPORTED (KLDR_ERR_BASE + 2)
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| 399 | /** The LX image format isn't supported by this kLdr build. */
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| 400 | #define KLDR_ERR_LX_NOT_SUPPORTED (KLDR_ERR_BASE + 3)
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| 401 | /** The LE image format isn't supported by this kLdr build. */
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| 402 | #define KLDR_ERR_LE_NOT_SUPPORTED (KLDR_ERR_BASE + 4)
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| 403 | /** The PE image format isn't supported by this kLdr build. */
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| 404 | #define KLDR_ERR_PE_NOT_SUPPORTED (KLDR_ERR_BASE + 5)
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| 405 | /** The ELF image format isn't supported by this kLdr build. */
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| 406 | #define KLDR_ERR_ELF_NOT_SUPPORTED (KLDR_ERR_BASE + 6)
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| 407 | /** The mach-o image format isn't supported by this kLdr build. */
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| 408 | #define KLDR_ERR_MACHO_NOT_SUPPORTED (KLDR_ERR_BASE + 7)
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| 409 | /** The mach-o image format isn't supported by this kLdr build. */
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| 410 | #define KLDR_ERR_AOUT_NOT_SUPPORTED (KLDR_ERR_BASE + 8)
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| 411 | /** The mach-o image format isn't supported by this kLdr build. */
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| 412 | #define KLDR_ERR_BAD_FIXUP (KLDR_ERR_BASE + 32)
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| 413 |
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| 414 | /** @} */
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| 415 |
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| 416 |
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| 417 | #ifdef __cplusplus
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| 418 | }
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| 419 | #endif
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| 420 |
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| 421 | #endif
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| 422 |
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