| 1 | /* $Id: kLdrInternal.h 3578 2007-09-02 20:55:51Z 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 | #include <k/kHlp.h>
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| 32 | #include <k/kRdr.h>
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| 33 |
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| 34 | #ifdef __cplusplus
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| 35 | extern "C" {
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| 36 | #endif
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| 37 |
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| 38 | #if !defined(__X86__) && !defined(__AMD64__)
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| 39 | # if defined(__i386__) || defined(_M_IX86)
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| 40 | # define __X86__
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| 41 | # elif defined(__x86_64__) || defined(_M_X64) || defined(__AMD64__) || defined(_M_AMD64)
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| 42 | # define __AMD64__
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| 43 | # else
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| 44 | # error "can't figure out the target arch."
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| 45 | # endif
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| 46 | #endif
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| 47 |
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| 48 | /* ignore definitions in winnt.h */
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| 49 | #undef IMAGE_DOS_SIGNATURE
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| 50 | #undef IMAGE_NT_SIGNATURE
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| 51 |
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| 52 | /** @name Signatures we know
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| 53 | * @{ */
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| 54 | /** ELF signature ("\x7fELF"). */
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| 55 | #define IMAGE_ELF_SIGNATURE K_LE2H_U32(0x7f | ('E' << 8) | ((KU32)'L' << 16) | ((KU32)'F' << 24))
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| 56 | /** PE signature ("PE\0\0"). */
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| 57 | #define IMAGE_NT_SIGNATURE K_LE2H_U32('P' | ('E' << 8))
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| 58 | /** LX signature ("LX") */
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| 59 | #define IMAGE_LX_SIGNATURE K_LE2H_U16('L' | ('X' << 8))
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| 60 | /** LE signature ("LE") */
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| 61 | #define IMAGE_LE_SIGNATURE K_LE2H_U16('L' | ('E' << 8))
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| 62 | /** NE signature ("NE") */
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| 63 | #define IMAGE_NE_SIGNATURE K_LE2H_U16('N' | ('E' << 8))
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| 64 | /** MZ signature ("MZ"). */
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| 65 | #define IMAGE_DOS_SIGNATURE K_LE2H_U16('M' | ('Z' << 8))
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| 66 | /** The FAT signature (universal binaries). */
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| 67 | #define IMAGE_FAT_SIGNATURE KU32_C(0xcafebabe)
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| 68 | /** The FAT signature (universal binaries), other endian. */
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| 69 | #define IMAGE_FAT_SIGNATURE_OE KU32_C(0xbebafeca)
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| 70 | /** The 32-bit Mach-O signature. */
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| 71 | #define IMAGE_MACHO32_SIGNATURE KU32_C(0xfeedface)
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| 72 | /** The 32-bit Mach-O signature, other endian. */
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| 73 | #define IMAGE_MACHO32_SIGNATURE_OE KU32_C(0xcefaedfe)
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| 74 | /** The 64-bit Mach-O signature. */
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| 75 | #define IMAGE_MACHO64_SIGNATURE KU32_C(0xfeedfacf)
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| 76 | /** The 64-bit Mach-O signature, other endian. */
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| 77 | #define IMAGE_MACHO64_SIGNATURE_OE KU32_C(0xfefaedfe)
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| 78 | /** @} */
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| 79 |
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| 80 | /** @defgroup grp_kLdrInternal Internals
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| 81 | * @internal
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| 82 | * @{
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| 83 | */
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| 84 |
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| 85 |
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| 86 | /**
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| 87 | * The state of a dynamic loader module.
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| 88 | * @image html KLDRSTATE.gif "The state diagram"
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| 89 | */
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| 90 | typedef enum KLDRSTATE
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| 91 | {
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| 92 | /** The usual invalid 0 enum. */
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| 93 | KLDRSTATE_INVALID = 0,
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| 94 |
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| 95 | /** The module has just been opened and linked into the load list.
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| 96 | *
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| 97 | * Prev state: -
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| 98 | * Next state: MAPPED, PENDING_DESTROY
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| 99 | */
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| 100 | KLDRSTATE_OPEN,
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| 101 |
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| 102 | /** The module segments has been mapped into the process memory.
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| 103 | *
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| 104 | * Prev state: OPEN
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| 105 | * Next state: LOADED_PREREQUISITES, PENDING_DESTROY
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| 106 | */
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| 107 | KLDRSTATE_MAPPED,
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| 108 | /** The module has been reloaded and needs to be fixed up again.
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| 109 | * This can occure when the loader is called recursivly.
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| 110 | *
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| 111 | * The reason RELOADED modules must go back to the PENDING_GC state is
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| 112 | * because we want to guard against uninit order issues, and therefore
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| 113 | * doesn't unmap modules untill all pending termintation callbacks has
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| 114 | * been executed.
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| 115 | *
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| 116 | * Prev state: PENDING_GC
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| 117 | * Next state: RELOADED_LOADED_PREREQUISITES, PENDING_GC
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| 118 | */
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| 119 | KLDRSTATE_RELOADED,
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| 120 |
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| 121 | /** The immediate prerequisites have been loaded.
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| 122 | *
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| 123 | * Prev state: MAPPED
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| 124 | * Next state: FIXED_UP, PENDING_DESTROY
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| 125 | */
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| 126 | KLDRSTATE_LOADED_PREREQUISITES,
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| 127 | /** The immediate prerequisites have been loaded for a reloaded module.
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| 128 | *
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| 129 | * Prev state: RELOADED
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| 130 | * Next state: RELOADED_FIXED_UP, PENDING_GC
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| 131 | */
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| 132 | KLDRSTATE_RELOADED_LOADED_PREREQUISITES,
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| 133 |
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| 134 | /** Fixups has been applied.
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| 135 | *
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| 136 | * Prev state: LOADED_PREREQUISITES
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| 137 | * Next state: PENDING_INITIALIZATION, PENDING_DESTROY
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| 138 | */
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| 139 | KLDRSTATE_FIXED_UP,
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| 140 | /** Fixups has been applied.
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| 141 | *
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| 142 | * Prev state: RELOADED_LOADED_PREREQUISITES
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| 143 | * Next state: PENDING_INITIALIZATION, PENDING_GC
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| 144 | */
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| 145 | KLDRSTATE_RELOADED_FIXED_UP,
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| 146 |
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| 147 | /** Pending initialization.
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| 148 | * While the module is in this state the loader is in reentrant mode.
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| 149 | *
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| 150 | * Prev state: FIXED_UP, RELOADED_FIXED_UP
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| 151 | * Next state: INITIALIZATION, PENDING_GC
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| 152 | */
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| 153 | KLDRSTATE_PENDING_INITIALIZATION,
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| 154 |
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| 155 | /** Initializing.
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| 156 | * While the module is in this state the loader is in reentrant mode.
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| 157 | *
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| 158 | * Prev state: PENDING_INITIALIZATION
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| 159 | * Next state: GOOD, PENDING_GC
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| 160 | */
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| 161 | KLDRSTATE_INITIALIZING,
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| 162 |
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| 163 | /** Initialization failed.
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| 164 | *
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| 165 | * This is somewhat similar to PENDING_GC except that, a module
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| 166 | * in this state cannot be reloaded untill we've done GC. This ensures
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| 167 | * that a init failure during recursive loading is propagated up.
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| 168 | *
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| 169 | * While the module is in this state the loader is in reentrant mode.
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| 170 | *
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| 171 | * Prev state: INITIALIZING
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| 172 | * Next state: GC
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| 173 | */
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| 174 | KLDRSTATE_INITIALIZATION_FAILED,
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| 175 |
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| 176 | /** The module has been successfully loaded and initialized.
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| 177 | * While the module is in this state the loader can be in reentrant
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| 178 | * or 'unused' mode.
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| 179 | *
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| 180 | * Prev state: INITIALIZING
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| 181 | * Next state: PENDING_TERMINATION
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| 182 | */
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| 183 | KLDRSTATE_GOOD,
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| 184 |
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| 185 | /** Pending termination, reference count is 0.
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| 186 | * While the module is in this state the loader is in reentrant mode.
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| 187 | * Prerequisite modules are dropped when a module enters this state.
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| 188 | *
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| 189 | * Prev state: GOOD
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| 190 | * Next state: TERMINATING, GOOD
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| 191 | */
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| 192 | KLDRSTATE_PENDING_TERMINATION,
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| 193 |
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| 194 | /** Terminating, reference count is still 0.
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| 195 | * While the module is in this state the loader is in reentrant mode.
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| 196 | *
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| 197 | * Prev state: PENDING_TERMINATION
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| 198 | * Next state: PENDING_GC
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| 199 | */
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| 200 | KLDRSTATE_TERMINATING,
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| 201 |
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| 202 | /** Pending garbage collection.
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| 203 | * Prerequisite modules are dropped when a module enters this state (if not done already).
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| 204 | *
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| 205 | * Prev state: TERMINATING, PENDING_INITIALIZATION, INITIALIZATION_FAILED
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| 206 | * Next state: GC, RELOADED
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| 207 | */
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| 208 | KLDRSTATE_PENDING_GC,
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| 209 |
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| 210 | /** Being garbage collected.
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| 211 | *
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| 212 | * Prev state: PENDING_GC, INITIALIZATION_FAILED
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| 213 | * Next state: PENDING_DESTROY, DESTROYED
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| 214 | */
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| 215 | KLDRSTATE_GC,
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| 216 |
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| 217 | /** The module has be unlinked, but there are still stack references to it.
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| 218 | *
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| 219 | * Prev state: GC, FIXED_UP, LOADED_PREREQUISITES, MAPPED, OPEN
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| 220 | * Next state: DESTROYED
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| 221 | */
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| 222 | KLDRSTATE_PENDING_DESTROY,
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| 223 |
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| 224 | /** The module has been destroyed but not freed yet.
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| 225 | *
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| 226 | * This happens when a module ends up being destroyed when cRefs > 0. The
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| 227 | * module structure will be freed when cRefs reaches 0.
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| 228 | *
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| 229 | * Prev state: GC, PENDING_DESTROY
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| 230 | */
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| 231 | KLDRSTATE_DESTROYED,
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| 232 |
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| 233 | /** The end of valid states (exclusive) */
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| 234 | KLDRSTATE_END = KLDRSTATE_DESTROYED,
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| 235 | /** The usual 32-bit blowup. */
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| 236 | KLDRSTATE_32BIT_HACK = 0x7fffffff
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| 237 | } KLDRSTATE;
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| 238 |
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| 239 |
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| 240 | /**
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| 241 | * Dynamic loader module.
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| 242 | */
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| 243 | typedef struct KLDRDYLDMOD
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| 244 | {
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| 245 | /** Magic number. */
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| 246 | KU32 u32MagicHead;
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| 247 | /** The module state. */
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| 248 | KLDRSTATE enmState;
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| 249 | /** The module. */
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| 250 | PKLDRMOD pMod;
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| 251 | /** The module handle. */
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| 252 | HKLDRMOD hMod;
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| 253 | /** The total number of references. */
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| 254 | KU32 cRefs;
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| 255 | /** The number of dependency references. */
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| 256 | KU32 cDepRefs;
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| 257 | /** The number of dynamic load references. */
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| 258 | KU32 cDynRefs;
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| 259 | /** Set if this is the executable module.
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| 260 | * When clear, the module is a shared object or relocatable object. */
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| 261 | KU32 fExecutable : 1;
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| 262 | /** Global DLL (set) or specific DLL (clear). */
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| 263 | KU32 fGlobalOrSpecific : 1;
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| 264 | /** Whether the module contains bindable symbols in the global unix namespace. */
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| 265 | KU32 fBindable : 1;
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| 266 | /** Set if linked into the global init list. */
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| 267 | KU32 fInitList : 1;
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| 268 | /** Already loaded or checked prerequisites.
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| 269 | * This flag is used when loading prerequisites, when set it means that
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| 270 | * this module is already seen and shouldn't be processed again. */
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| 271 | KU32 fAlreadySeen : 1;
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| 272 | /** Set if the module is currently mapped.
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| 273 | * This is used to avoid unnecessary calls to kLdrModUnmap during cleanup. */
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| 274 | KU32 fMapped : 1;
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| 275 | /** Set if TLS allocation has been done. (part of the mapping). */
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| 276 | KU32 fAllocatedTLS : 1;
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| 277 | /** Reserved for future use. */
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| 278 | KU32 f25Reserved : 25;
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| 279 | /** The load list linkage. */
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| 280 | struct
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| 281 | {
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| 282 | /** The next module in the list. */
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| 283 | struct KLDRDYLDMOD *pNext;
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| 284 | /** The prev module in the list. */
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| 285 | struct KLDRDYLDMOD *pPrev;
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| 286 | } Load;
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| 287 | /** The initialization and termination list linkage.
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| 288 | * If non-recursive initialization is used, the module will be pushed on
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| 289 | * the initialization list.
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| 290 | * A module will be linked into the termination list upon a successful
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| 291 | * return from module initialization. */
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| 292 | struct
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| 293 | {
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| 294 | /** The next module in the list. */
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| 295 | struct KLDRDYLDMOD *pNext;
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| 296 | /** The prev module in the list. */
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| 297 | struct KLDRDYLDMOD *pPrev;
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| 298 | } InitTerm;
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| 299 | /** The bind order list linkage.
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| 300 | * The module is not in this list when fBindable is clear. */
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| 301 | struct
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| 302 | {
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| 303 | /** The next module in the list. */
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| 304 | struct KLDRDYLDMOD *pNext;
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| 305 | /** The prev module in the list. */
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| 306 | struct KLDRDYLDMOD *pPrev;
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| 307 | } Bind;
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| 308 |
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| 309 | /** The number of prerequisite modules in the prereq array. */
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| 310 | KU32 cPrereqs;
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| 311 | /** Pointer to an array of prerequisite module pointers.
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| 312 | * This array is only filled when in the states starting with
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| 313 | * KLDRSTATE_LOADED_PREREQUISITES thru KLDRSTATE_GOOD.
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| 314 | */
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| 315 | struct KLDRDYLDMOD **papPrereqs;
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| 316 |
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| 317 | /** Magic number. */
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| 318 | KU32 u32MagicTail;
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| 319 | } KLDRDYLDMOD, *PKLDRDYLDMOD, **PPKLDRDYLDMOD;
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| 320 |
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| 321 | /** KLDRDYLDMOD magic value. (Fuyumi Soryo) */
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| 322 | #define KLDRDYMOD_MAGIC 0x19590106
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| 323 |
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| 324 | /** Return / crash validation of a module handle argument. */
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| 325 | #define KLDRDYLD_VALIDATE_HKLDRMOD(hMod) \
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| 326 | do { \
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| 327 | if ( (hMod) == NIL_HKLDRMOD \
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| 328 | || (hMod)->u32MagicHead != KLDRDYMOD_MAGIC \
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| 329 | || (hMod)->u32MagicTail != KLDRDYMOD_MAGIC) \
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| 330 | { \
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| 331 | return KLDR_ERR_INVALID_HANDLE; \
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| 332 | } \
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| 333 | } while (0)
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| 334 |
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| 335 |
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| 336 | int kldrInit(void);
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| 337 | void kldrTerm(void);
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| 338 |
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| 339 | int kldrDyldInit(void);
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| 340 | void kldrDyldTerm(void);
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| 341 |
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| 342 | void kldrDyldDoLoadExe(PKLDRDYLDMOD pExe);
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| 343 | int kldrDyldFailure(int rc, const char *pszFormat, ...);
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| 344 |
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| 345 | int kldrDyldOSStartExe(KUPTR uMainEntrypoint, void *pvStack, KSIZE cbStack);
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| 346 | void *kldrDyldOSAllocStack(KSIZE cb);
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| 347 |
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| 348 | int kldrDyldFindInit(void);
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| 349 | int kldrDyldFindNewModule(const char *pszName, const char *pszPrefix, const char *pszSuffix,
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| 350 | KLDRDYLDSEARCH enmSearch, unsigned fFlags, PPKLDRDYLDMOD ppMod);
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| 351 | int kldrDyldFindExistingModule(const char *pszName, const char *pszPrefix, const char *pszSuffix,
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| 352 | KLDRDYLDSEARCH enmSearch, unsigned fFlags, PPKLDRDYLDMOD ppMod);
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| 353 |
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| 354 | int kldrDyldGetPrerequisite(const char *pszDll, const char *pszPrefix, const char *pszSuffix, KLDRDYLDSEARCH enmSearch,
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| 355 | unsigned fFlags, PKLDRDYLDMOD pDep, PPKLDRDYLDMOD ppMod);
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| 356 |
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| 357 |
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| 358 | int kldrDyldModCreate(PKRDR pRdr, KU32 fFlags, PPKLDRDYLDMOD ppMod);
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| 359 | void kldrDyldModDestroy(PKLDRDYLDMOD pMod);
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| 360 | void kldrDyldModAddRef(PKLDRDYLDMOD pMod);
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| 361 | void kldrDyldModDeref(PKLDRDYLDMOD pMod);
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| 362 | void kldrDyldModAddDep(PKLDRDYLDMOD pMod, PKLDRDYLDMOD pDep);
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| 363 | void kldrDyldModRemoveDep(PKLDRDYLDMOD pMod, PKLDRDYLDMOD pDep);
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| 364 | int kldrDyldModDynamicLoad(PKLDRDYLDMOD pMod);
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| 365 | int kldrDyldModDynamicUnload(PKLDRDYLDMOD pMod);
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| 366 | void kldrDyldModMarkGlobal(PKLDRDYLDMOD pMod);
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| 367 | void kldrDyldModMarkSpecific(PKLDRDYLDMOD pMod);
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| 368 | void kldrDyldModSetBindable(PKLDRDYLDMOD pMod, unsigned fDeep);
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| 369 | void kldrDyldModClearBindable(PKLDRDYLDMOD pMod);
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| 370 | int kldrDyldModMap(PKLDRDYLDMOD pMod);
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| 371 | int kldrDyldModUnmap(PKLDRDYLDMOD pMod);
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| 372 | int kldrDyldModLoadPrerequisites(PKLDRDYLDMOD pMod, const char *pszPrefix, const char *pszSuffix,
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| 373 | KLDRDYLDSEARCH enmSearch, unsigned fFlags);
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| 374 | int kldrDyldModCheckPrerequisites(PKLDRDYLDMOD pMod);
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| 375 | void kldrDyldModUnloadPrerequisites(PKLDRDYLDMOD pMod);
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| 376 | int kldrDyldModFixup(PKLDRDYLDMOD pMod);
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| 377 | int kldrDyldModCallInit(PKLDRDYLDMOD pMod);
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| 378 | void kldrDyldModCallTerm(PKLDRDYLDMOD pMod);
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| 379 | int kldrDyldModReload(PKLDRDYLDMOD pMod);
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| 380 | int kldrDyldModAttachThread(PKLDRDYLDMOD pMod);
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| 381 | void kldrDyldModDetachThread(PKLDRDYLDMOD pMod);
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| 382 | int kldrDyldModGetMainStack(PKLDRDYLDMOD pMod, void **ppvStack, KSIZE *pcbStack);
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| 383 | int kldrDyldModStartExe(PKLDRDYLDMOD pMod);
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| 384 |
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| 385 | int kldrDyldModGetName(PKLDRDYLDMOD pMod, char *pszName, KSIZE cchName);
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| 386 | int kldrDyldModGetFilename(PKLDRDYLDMOD pMod, char *pszFilename, KSIZE cchFilename);
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| 387 | int kldrDyldModQuerySymbol(PKLDRDYLDMOD pMod, KU32 uSymbolOrdinal, const char *pszSymbolName, KUPTR *puValue, KU32 *pfKind);
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| 388 |
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| 389 |
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| 390 | /** Pointer to the head module (the executable).
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| 391 | * (This is exported, so no prefix.) */
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| 392 | extern PKLDRDYLDMOD kLdrDyldHead;
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| 393 | /** Pointer to the tail module.
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| 394 | * (This is exported, so no prefix.) */
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| 395 | extern PKLDRDYLDMOD kLdrDyldTail;
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| 396 | /** Pointer to the head module of the initialization list.
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| 397 | * The outermost load call will pop elements from this list in LIFO order (i.e.
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| 398 | * from the tail). The list is only used during non-recursive initialization
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| 399 | * and may therefore share the pNext/pPrev members with the termination list
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| 400 | * since we don't push a module onto the termination list untill it has been
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| 401 | * successfully initialized. */
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| 402 | extern PKLDRDYLDMOD g_pkLdrDyldInitHead;
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| 403 | /** Pointer to the tail module of the initalization list. */
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| 404 | extern PKLDRDYLDMOD g_pkLdrDyldInitTail;
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| 405 | /** Pointer to the head module of the termination order list. */
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| 406 | extern PKLDRDYLDMOD g_pkLdrDyldTermHead;
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| 407 | /** Pointer to the tail module of the termination order list. */
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| 408 | extern PKLDRDYLDMOD g_pkLdrDyldTermTail;
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| 409 | /** Pointer to the head module of the bind order list.
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| 410 | * The modules in this list makes up the global namespace used when binding symbol unix fashion. */
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| 411 | extern PKLDRDYLDMOD g_pkLdrDyldBindHead;
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| 412 | /** Pointer to the tail module of the bind order list. */
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| 413 | extern PKLDRDYLDMOD g_pkLdrDyldBindTail;
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| 414 |
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| 415 | /** Indicates that the other MainStack globals have been filled in. */
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| 416 | extern unsigned g_fkLdrDyldDoneMainStack;
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| 417 | /** Whether the stack was allocated seperatly or was part of the executable. */
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| 418 | extern unsigned g_fkLdrDyldMainStackAllocated;
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| 419 | /** Pointer to the main stack object. */
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| 420 | extern void *g_pvkLdrDyldMainStack;
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| 421 | /** The size of the main stack object. */
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| 422 | extern KSIZE g_cbkLdrDyldMainStack;
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| 423 |
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| 424 | /** The global error buffer. */
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| 425 | extern char g_szkLdrDyldError[1024];
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| 426 |
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| 427 | extern char kLdrDyldExePath[8192];
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| 428 | extern char kLdrDyldLibraryPath[8192];
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| 429 | extern char kLdrDyldDefPrefix[16];
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| 430 | extern char kLdrDyldDefSuffix[16];
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| 431 |
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| 432 | extern int g_fBootstrapping;
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| 433 |
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| 434 |
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| 435 | /** @name The Loader semaphore
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| 436 | * @{ */
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| 437 | int kLdrDyldSemInit(void);
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| 438 | void kLdrDyldSemTerm(void);
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| 439 | int kLdrDyldSemRequest(void);
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| 440 | void kLdrDyldSemRelease(void);
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| 441 | /** @} */
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| 442 |
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| 443 |
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| 444 | /** @name Module interpreter method tables
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| 445 | * @{ */
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| 446 | extern KLDRMODOPS g_kLdrModLXOps;
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| 447 | extern KLDRMODOPS g_kLdrModMachOOps;
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| 448 | extern KLDRMODOPS g_kLdrModNativeOps;
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| 449 | extern KLDRMODOPS g_kLdrModPEOps;
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| 450 | /** @} */
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| 451 |
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| 452 |
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| 453 | /** @} */
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| 454 | #ifdef __cplusplus
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| 455 | }
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| 456 | #endif
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| 457 |
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| 458 | #endif
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