| 1 | /* $Id: kLdrInternal.h 2883 2006-11-18 11:21:33Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * kLdr - The Dynamic Loader, internal header.
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| 5 | *
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| 6 | * Copyright (c) 2006 knut st. osmundsen <bird-kbuild-src@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 |
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| 28 | #ifndef __kLdrInternal_h__
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| 29 | #define __kLdrInternal_h__
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| 30 |
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| 31 | #ifdef __cplusplus
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| 32 | extern "C" {
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| 33 | #endif
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| 34 |
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| 35 | #if !defined(__X86__) || !defined(__AMD64__)
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| 36 | # if defined(__i386__) || defined(_M_IX86)
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| 37 | # define __X86__
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| 38 | # elif defined(__x86_64__) || defined(_M_X64) || defined(__AMD64__) || defined(_M_AMD64)
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| 39 | # define __AMD64__
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| 40 | # else
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| 41 | # error "can't figure out the target arch."
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| 42 | # endif
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| 43 | #endif
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| 44 |
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| 45 | /* ignore definitions in winnt.h */
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| 46 | #undef IMAGE_DOS_SIGNATURE
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| 47 | #undef IMAGE_NT_SIGNATURE
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| 48 |
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| 49 | /** @name Signatures we know
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| 50 | * @{ */
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| 51 | /** ELF signature ("\x7fELF"). */
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| 52 | #define IMAGE_ELF_SIGNATURE KLDRHLP_LE2H_U32(0x7f | ('E' << 8) | ((uint32_t)'L' << 16) | ((uint32_t)'F' << 24))
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| 53 | /** PE signature ("PE\0\0"). */
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| 54 | #define IMAGE_NT_SIGNATURE KLDRHLP_LE2H_U32('P' | ('E' << 8))
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| 55 | /** LX signature ("LX") */
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| 56 | #define IMAGE_LX_SIGNATURE KLDRHLP_LE2H_U16('L' | ('X' << 8))
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| 57 | /** LE signature ("LE") */
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| 58 | #define IMAGE_LE_SIGNATURE KLDRHLP_LE2H_U16('L' | ('E' << 8))
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| 59 | /** NE signature ("NE") */
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| 60 | #define IMAGE_NE_SIGNATURE KLDRHLP_LE2H_U16('N' | ('E' << 8))
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| 61 | /** MZ signature ("MZ"). */
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| 62 | #define IMAGE_DOS_SIGNATURE KLDRHLP_LE2H_U16('M' | ('Z' << 8))
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| 63 | /** @} */
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| 64 |
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| 65 | /** @defgroup grp_kLdrInternal Internals
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| 66 | * @internal
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| 67 | * @{
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| 68 | */
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| 69 |
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| 70 |
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| 71 | /** Native file provider operations. */
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| 72 | extern const KLDRRDROPS g_kLdrRdrFileOps;
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| 73 |
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| 74 |
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| 75 | /**
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| 76 | * The state of a dynamic loader module.
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| 77 | * @image html KLDRSTATE.gif "The state diagram"
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| 78 | */
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| 79 | typedef enum KLDRSTATE
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| 80 | {
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| 81 | /** The usual invalid 0 enum. */
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| 82 | KLDRSTATE_INVALID = 0,
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| 83 |
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| 84 | /** The module has just been opened and linked into the load list.
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| 85 | *
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| 86 | * Prev state: -
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| 87 | * Next state: MAPPED, PENDING_DESTROY
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| 88 | */
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| 89 | KLDRSTATE_OPEN,
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| 90 |
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| 91 | /** The module segments has been mapped into the process memory.
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| 92 | *
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| 93 | * Prev state: OPEN
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| 94 | * Next state: LOADED_PREREQUISITES, PENDING_DESTROY
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| 95 | */
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| 96 | KLDRSTATE_MAPPED,
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| 97 | /** The module has been reloaded and needs to be fixed up again.
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| 98 | * This can occure when the loader is called recursivly.
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| 99 | *
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| 100 | * The reason RELOADED modules must go back to the PENDING_GC state is
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| 101 | * because we want to guard against uninit order issues, and therefore
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| 102 | * doesn't unmap modules untill all pending termintation callbacks has
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| 103 | * been executed.
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| 104 | *
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| 105 | * Prev state: PENDING_GC
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| 106 | * Next state: RELOADED_LOADED_PREREQUISITES, PENDING_GC
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| 107 | */
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| 108 | KLDRSTATE_RELOADED,
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| 109 |
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| 110 | /** The immediate prerequisites have been loaded.
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| 111 | *
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| 112 | * Prev state: MAPPED
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| 113 | * Next state: FIXED_UP, PENDING_DESTROY
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| 114 | */
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| 115 | KLDRSTATE_LOADED_PREREQUISITES,
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| 116 | /** The immediate prerequisites have been loaded for a reloaded module.
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| 117 | *
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| 118 | * Prev state: RELOADED
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| 119 | * Next state: RELOADED_FIXED_UP, PENDING_GC
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| 120 | */
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| 121 | KLDRSTATE_RELOADED_LOADED_PREREQUISITES,
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| 122 |
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| 123 | /** Fixups has been applied.
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| 124 | *
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| 125 | * Prev state: LOADED_PREREQUISITES
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| 126 | * Next state: PENDING_INITIALIZATION, PENDING_DESTROY
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| 127 | */
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| 128 | KLDRSTATE_FIXED_UP,
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| 129 | /** Fixups has been applied.
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| 130 | *
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| 131 | * Prev state: RELOADED_LOADED_PREREQUISITES
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| 132 | * Next state: PENDING_INITIALIZATION, PENDING_GC
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| 133 | */
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| 134 | KLDRSTATE_RELOADED_FIXED_UP,
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| 135 |
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| 136 | /** Pending initialization.
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| 137 | * While the module is in this state the loader is in reentrant mode.
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| 138 | *
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| 139 | * Prev state: FIXED_UP, RELOADED_FIXED_UP
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| 140 | * Next state: INITIALIZATION, PENDING_GC
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| 141 | */
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| 142 | KLDRSTATE_PENDING_INITIALIZATION,
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| 143 |
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| 144 | /** Initializing.
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| 145 | * While the module is in this state the loader is in reentrant mode.
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| 146 | *
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| 147 | * Prev state: PENDING_INITIALIZATION
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| 148 | * Next state: GOOD, PENDING_GC
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| 149 | */
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| 150 | KLDRSTATE_INITIALIZING,
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| 151 |
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| 152 | /** Initialization failed.
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| 153 | *
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| 154 | * This is somewhat similar to PENDING_GC except that, a module
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| 155 | * in this state cannot be reloaded untill we've done GC. This ensures
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| 156 | * that a init failure during recursive loading is propagated up.
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| 157 | *
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| 158 | * While the module is in this state the loader is in reentrant mode.
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| 159 | *
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| 160 | * Prev state: INITIALIZING
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| 161 | * Next state: GC
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| 162 | */
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| 163 | KLDRSTATE_INITIALIZATION_FAILED,
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| 164 |
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| 165 | /** The module has been successfully loaded and initialized.
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| 166 | * While the module is in this state the loader can be in reentrant
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| 167 | * or 'unused' mode.
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| 168 | *
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| 169 | * Prev state: INITIALIZING
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| 170 | * Next state: PENDING_TERMINATION
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| 171 | */
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| 172 | KLDRSTATE_GOOD,
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| 173 |
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| 174 | /** Pending termination, reference count is 0.
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| 175 | * While the module is in this state the loader is in reentrant mode.
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| 176 | * Prerequisite modules are dropped when a module enters this state.
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| 177 | *
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| 178 | * Prev state: GOOD
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| 179 | * Next state: TERMINATING, GOOD
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| 180 | */
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| 181 | KLDRSTATE_PENDING_TERMINATION,
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| 182 |
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| 183 | /** Terminating, reference count is still 0.
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| 184 | * While the module is in this state the loader is in reentrant mode.
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| 185 | *
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| 186 | * Prev state: PENDING_TERMINATION
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| 187 | * Next state: PENDING_GC
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| 188 | */
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| 189 | KLDRSTATE_TERMINATING,
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| 190 |
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| 191 | /** Pending garbage collection.
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| 192 | * Prerequisite modules are dropped when a module enters this state (if not done already).
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| 193 | *
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| 194 | * Prev state: TERMINATING, PENDING_INITIALIZATION, INITIALIZATION_FAILED
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| 195 | * Next state: GC, RELOADED
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| 196 | */
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| 197 | KLDRSTATE_PENDING_GC,
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| 198 |
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| 199 | /** Being garbage collected.
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| 200 | *
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| 201 | * Prev state: PENDING_GC, INITIALIZATION_FAILED
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| 202 | * Next state: PENDING_DESTROY, DESTROYED
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| 203 | */
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| 204 | KLDRSTATE_GC,
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| 205 |
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| 206 | /** The module has be unlinked, but there are still stack references to it.
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| 207 | *
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| 208 | * Prev state: GC, FIXED_UP, LOADED_PREREQUISITES, MAPPED, OPEN
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| 209 | * Next state: DESTROYED
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| 210 | */
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| 211 | KLDRSTATE_PENDING_DESTROY,
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| 212 |
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| 213 | /** The module has been destroyed but not freed yet.
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| 214 | *
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| 215 | * This happens when a module ends up being destroyed when cRefs > 0. The
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| 216 | * module structure will be freed when cRefs reaches 0.
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| 217 | *
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| 218 | * Prev state: GC, PENDING_DESTROY
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| 219 | */
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| 220 | KLDRSTATE_DESTROYED,
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| 221 |
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| 222 | /** The end of valid states (exclusive) */
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| 223 | KLDRSTATE_END = KLDRSTATE_DESTROYED,
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| 224 | /** The usual 32-bit blowup. */
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| 225 | KLDRSTATE_32BIT_HACK = 0x7fffffff
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| 226 | } KLDRSTATE;
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| 227 |
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| 228 |
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| 229 | /**
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| 230 | * Dynamic loader module.
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| 231 | */
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| 232 | typedef struct KLDRDYLDMOD
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| 233 | {
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| 234 | /** Magic number. */
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| 235 | uint32_t u32MagicHead;
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| 236 | /** The module state. */
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| 237 | KLDRSTATE enmState;
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| 238 | /** The module. */
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| 239 | PKLDRMOD pMod;
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| 240 | /** The module handle. */
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| 241 | HKLDRMOD hMod;
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| 242 | /** The total number of references. */
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| 243 | uint32_t cRefs;
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| 244 | /** The number of dependency references. */
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| 245 | uint32_t cDepRefs;
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| 246 | /** The number of dynamic load references. */
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| 247 | uint32_t cDynRefs;
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| 248 | /** Set if this is the executable module.
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| 249 | * When clear, the module is a shared object or relocatable object. */
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| 250 | uint32_t fExecutable : 1;
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| 251 | /** Global DLL (set) or specific DLL (clear). */
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| 252 | uint32_t fGlobalOrSpecific : 1;
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| 253 | /** Whether the module contains bindable symbols in the global unix namespace. */
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| 254 | uint32_t fBindable : 1;
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| 255 | /** Set if linked into the global init list. */
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| 256 | uint32_t fInitList : 1;
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| 257 | /** Already loaded or checked prerequisites.
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| 258 | * This flag is used when loading prerequisites, when set it means that
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| 259 | * this module is already seen and shouldn't be processed again. */
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| 260 | uint32_t fAlreadySeen : 1;
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| 261 | /** Set if the module is currently mapped.
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| 262 | * This is used to avoid unnecessary calls to kLdrModUnmap during cleanup. */
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| 263 | uint32_t fMapped : 1;
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| 264 | /** Set if TLS allocation has been done. (part of the mapping). */
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| 265 | uint32_t fAllocatedTLS : 1;
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| 266 | /** Reserved for future use. */
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| 267 | uint32_t f25Reserved : 25;
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| 268 | /** The load list linkage. */
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| 269 | struct
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| 270 | {
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| 271 | /** The next module in the list. */
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| 272 | struct KLDRDYLDMOD *pNext;
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| 273 | /** The prev module in the list. */
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| 274 | struct KLDRDYLDMOD *pPrev;
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| 275 | } Load;
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| 276 | /** The initialization and termination list linkage.
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| 277 | * If non-recursive initialization is used, the module will be pushed on
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| 278 | * the initialization list.
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| 279 | * A module will be linked into the termination list upon a successful
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| 280 | * return from module initialization. */
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| 281 | struct
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| 282 | {
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| 283 | /** The next module in the list. */
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| 284 | struct KLDRDYLDMOD *pNext;
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| 285 | /** The prev module in the list. */
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| 286 | struct KLDRDYLDMOD *pPrev;
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| 287 | } InitTerm;
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| 288 | /** The bind order list linkage.
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| 289 | * The module is not in this list when fBindable is clear. */
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| 290 | struct
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| 291 | {
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| 292 | /** The next module in the list. */
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| 293 | struct KLDRDYLDMOD *pNext;
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| 294 | /** The prev module in the list. */
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| 295 | struct KLDRDYLDMOD *pPrev;
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| 296 | } Bind;
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| 297 |
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| 298 | /** The number of prerequisite modules in the prereq array. */
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| 299 | uint32_t cPrereqs;
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| 300 | /** Pointer to an array of prerequisite module pointers.
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| 301 | * This array is only filled when in the states starting with
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| 302 | * KLDRSTATE_LOADED_PREREQUISITES thru KLDRSTATE_GOOD.
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| 303 | */
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| 304 | struct KLDRDYLDMOD **papPrereqs;
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| 305 |
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| 306 | /** Magic number. */
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| 307 | uint32_t u32MagicTail;
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| 308 | } KLDRDYLDMOD, *PKLDRDYLDMOD, **PPKLDRDYLDMOD;
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| 309 |
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| 310 | /** KLDRDYLDMOD magic value. (Fuyumi Soryo) */
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| 311 | #define KLDRDYMOD_MAGIC 0x19590106
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| 312 |
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| 313 | /** Return / crash validation of a module handle argument. */
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| 314 | #define KLDRDYLD_VALIDATE_HKLDRMOD(hMod) \
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| 315 | do { \
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| 316 | if ( (hMod) == NIL_HKLDRMOD \
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| 317 | || (hMod)->u32MagicHead != KLDRDYMOD_MAGIC \
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| 318 | || (hMod)->u32MagicTail != KLDRDYMOD_MAGIC) \
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| 319 | { \
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| 320 | return KLDR_ERR_INVALID_HANDLE; \
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| 321 | } \
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| 322 | } while (0)
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| 323 |
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| 324 |
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| 325 | int kldrInit(void);
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| 326 | void kldrTerm(void);
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| 327 |
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| 328 | int kldrDyldInit(void);
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| 329 | void kldrDyldTerm(void);
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| 330 |
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| 331 | void kldrDyldDoLoadExe(PKLDRDYLDMOD pExe);
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| 332 | int kldrDyldFailure(int rc, const char *pszFormat, ...);
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| 333 |
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| 334 | int kldrDyldOSStartExe(uintptr_t uMainEntrypoint, void *pvStack, size_t cbStack);
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| 335 | void *kldrDyldOSAllocStack(size_t cb);
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| 336 |
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| 337 | int kldrDyldFindInit(void);
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| 338 | int kldrDyldFindNewModule(const char *pszName, const char *pszPrefix, const char *pszSuffix,
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| 339 | KLDRDYLDSEARCH enmSearch, unsigned fFlags, PPKLDRDYLDMOD ppMod);
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| 340 | int kldrDyldFindExistingModule(const char *pszName, const char *pszPrefix, const char *pszSuffix,
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| 341 | KLDRDYLDSEARCH enmSearch, unsigned fFlags, PPKLDRDYLDMOD ppMod);
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| 342 |
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| 343 | int kldrDyldGetPrerequisite(const char *pszDll, const char *pszPrefix, const char *pszSuffix, KLDRDYLDSEARCH enmSearch,
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| 344 | unsigned fFlags, PKLDRDYLDMOD pDep, PPKLDRDYLDMOD ppMod);
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| 345 |
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| 346 |
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| 347 | int kldrDyldModCreate(PKLDRRDR pRdr, uint32_t fFlags, PPKLDRDYLDMOD ppMod);
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| 348 | void kldrDyldModDestroy(PKLDRDYLDMOD pMod);
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| 349 | void kldrDyldModAddRef(PKLDRDYLDMOD pMod);
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| 350 | void kldrDyldModDeref(PKLDRDYLDMOD pMod);
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| 351 | void kldrDyldModAddDep(PKLDRDYLDMOD pMod, PKLDRDYLDMOD pDep);
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| 352 | void kldrDyldModRemoveDep(PKLDRDYLDMOD pMod, PKLDRDYLDMOD pDep);
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| 353 | int kldrDyldModDynamicLoad(PKLDRDYLDMOD pMod);
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| 354 | int kldrDyldModDynamicUnload(PKLDRDYLDMOD pMod);
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| 355 | void kldrDyldModMarkGlobal(PKLDRDYLDMOD pMod);
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| 356 | void kldrDyldModMarkSpecific(PKLDRDYLDMOD pMod);
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| 357 | void kldrDyldModSetBindable(PKLDRDYLDMOD pMod, unsigned fDeep);
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| 358 | void kldrDyldModClearBindable(PKLDRDYLDMOD pMod);
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| 359 | int kldrDyldModMap(PKLDRDYLDMOD pMod);
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| 360 | int kldrDyldModUnmap(PKLDRDYLDMOD pMod);
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| 361 | int kldrDyldModLoadPrerequisites(PKLDRDYLDMOD pMod, const char *pszPrefix, const char *pszSuffix,
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| 362 | KLDRDYLDSEARCH enmSearch, unsigned fFlags);
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| 363 | int kldrDyldModCheckPrerequisites(PKLDRDYLDMOD pMod);
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| 364 | void kldrDyldModUnloadPrerequisites(PKLDRDYLDMOD pMod);
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| 365 | int kldrDyldModFixup(PKLDRDYLDMOD pMod);
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| 366 | int kldrDyldModCallInit(PKLDRDYLDMOD pMod);
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| 367 | void kldrDyldModCallTerm(PKLDRDYLDMOD pMod);
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| 368 | int kldrDyldModReload(PKLDRDYLDMOD pMod);
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| 369 | int kldrDyldModAttachThread(PKLDRDYLDMOD pMod);
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| 370 | void kldrDyldModDetachThread(PKLDRDYLDMOD pMod);
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| 371 | int kldrDyldModGetMainStack(PKLDRDYLDMOD pMod, void **ppvStack, size_t *pcbStack);
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| 372 | int kldrDyldModStartExe(PKLDRDYLDMOD pMod);
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| 373 |
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| 374 | int kldrDyldModGetName(PKLDRDYLDMOD pMod, char *pszName, size_t cchName);
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| 375 | int kldrDyldModGetFilename(PKLDRDYLDMOD pMod, char *pszFilename, size_t cchFilename);
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| 376 | int kldrDyldModQuerySymbol(PKLDRDYLDMOD pMod, uint32_t uSymbolOrdinal, const char *pszSymbolName, uintptr_t *puValue, uint32_t *pfKind);
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| 377 |
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| 378 |
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| 379 | /** Pointer to the head module (the executable).
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| 380 | * (This is exported, so no prefix.) */
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| 381 | extern PKLDRDYLDMOD kLdrDyldHead;
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| 382 | /** Pointer to the tail module.
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| 383 | * (This is exported, so no prefix.) */
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| 384 | extern PKLDRDYLDMOD kLdrDyldTail;
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| 385 | /** Pointer to the head module of the initialization list.
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| 386 | * The outermost load call will pop elements from this list in LIFO order (i.e.
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| 387 | * from the tail). The list is only used during non-recursive initialization
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| 388 | * and may therefore share the pNext/pPrev members with the termination list
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| 389 | * since we don't push a module onto the termination list untill it has been
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| 390 | * successfully initialized. */
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| 391 | extern PKLDRDYLDMOD g_pkLdrDyldInitHead;
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| 392 | /** Pointer to the tail module of the initalization list. */
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| 393 | extern PKLDRDYLDMOD g_pkLdrDyldInitTail;
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| 394 | /** Pointer to the head module of the termination order list. */
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| 395 | extern PKLDRDYLDMOD g_pkLdrDyldTermHead;
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| 396 | /** Pointer to the tail module of the termination order list. */
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| 397 | extern PKLDRDYLDMOD g_pkLdrDyldTermTail;
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| 398 | /** Pointer to the head module of the bind order list.
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| 399 | * The modules in this list makes up the global namespace used when binding symbol unix fashion. */
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| 400 | extern PKLDRDYLDMOD g_pkLdrDyldBindHead;
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| 401 | /** Pointer to the tail module of the bind order list. */
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| 402 | extern PKLDRDYLDMOD g_pkLdrDyldBindTail;
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| 403 |
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| 404 | /** Indicates that the other MainStack globals have been filled in. */
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| 405 | extern unsigned g_fkLdrDyldDoneMainStack;
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| 406 | /** Whether the stack was allocated seperatly or was part of the executable. */
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| 407 | extern unsigned g_fkLdrDyldMainStackAllocated;
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| 408 | /** Pointer to the main stack object. */
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| 409 | extern void *g_pvkLdrDyldMainStack;
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| 410 | /** The size of the main stack object. */
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| 411 | extern size_t g_cbkLdrDyldMainStack;
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| 412 |
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| 413 | /** The global error buffer. */
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| 414 | extern char g_szkLdrDyldError[1024];
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| 415 |
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| 416 | extern char kLdrDyldExePath[8192];
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| 417 | extern char kLdrDyldLibraryPath[8192];
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| 418 | extern char kLdrDyldDefPrefix[16];
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| 419 | extern char kLdrDyldDefSuffix[16];
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| 420 |
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| 421 | extern int g_fBootstrapping;
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| 422 |
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| 423 |
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| 424 | /** @name Module interpreter method tables
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| 425 | * @{ */
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| 426 | extern KLDRMODOPS g_kLdrModPEOps;
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| 427 | extern KLDRMODOPS g_kLdrModLXOps;
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| 428 | extern KLDRMODOPS g_kLdrModNativeOps;
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| 429 | /** @} */
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| 430 |
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| 431 | /** @} */
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| 432 | #ifdef __cplusplus
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| 433 | }
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| 434 | #endif
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| 435 |
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| 436 | #endif
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