| 1 | /* $Id: DBGFModule.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * DBGF - Debugger Facility, Module & Segment Management.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2008-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /** @page pg_dbgf_module DBGFModule - Module & Segment Management
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| 30 | *
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| 31 | * A module is our representation of an executable binary. It's main purpose
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| 32 | * is to provide segments that can be mapped into address spaces and thereby
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| 33 | * provide debug info for those parts for the guest code or data.
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| 34 | *
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| 35 | * This module will not deal directly with debug info, it will only serve
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| 36 | * as an interface between the debugger / symbol lookup and the debug info
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| 37 | * readers.
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| 38 | *
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| 39 | * An executable binary doesn't need to have a file, or that is, we don't
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| 40 | * need the file to create a module for it. There will be interfaces for
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| 41 | * ROMs to register themselves so we can get to their symbols, and there
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| 42 | * will be interfaces for the guest OS plugins (@see pg_dbgf_os) to
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| 43 | * register kernel, drivers and other global modules.
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| 44 | */
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| 45 |
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| 46 | #if 0
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| 47 | #include <VBox/vmm/dbgf.h>
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| 48 |
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| 49 |
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| 50 | /** Special segment number that indicates that the offset is a relative
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| 51 | * virtual address (RVA). I.e. an offset from the start of the module. */
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| 52 | #define DBGF_SEG_RVA UINT32_C(0xfffffff0)
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| 53 |
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| 54 | /** @defgroup grp_dbgf_dbginfo Debug Info Types
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| 55 | * @{ */
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| 56 | /** Other format. */
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| 57 | #define DBGF_DBGINFO_OTHER RT_BIT_32(0)
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| 58 | /** Stabs. */
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| 59 | #define DBGF_DBGINFO_STABS RT_BIT_32(1)
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| 60 | /** Debug With Arbitrary Record Format (DWARF). */
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| 61 | #define DBGF_DBGINFO_DWARF RT_BIT_32(2)
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| 62 | /** Microsoft Codeview debug info. */
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| 63 | #define DBGF_DBGINFO_CODEVIEW RT_BIT_32(3)
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| 64 | /** Watcom debug info. */
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| 65 | #define DBGF_DBGINFO_WATCOM RT_BIT_32(4)
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| 66 | /** IBM High Level Language debug info. */
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| 67 | #define DBGF_DBGINFO_HLL RT_BIT_32(5)
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| 68 | /** Old OS/2 and Windows symbol file. */
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| 69 | #define DBGF_DBGINFO_SYM RT_BIT_32(6)
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| 70 | /** Map file. */
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| 71 | #define DBGF_DBGINFO_MAP RT_BIT_32(7)
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| 72 | /** @} */
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| 73 |
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| 74 | /** @defgroup grp_dbgf_exeimg Executable Image Types
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| 75 | * @{ */
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| 76 | /** Some other format. */
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| 77 | #define DBGF_EXEIMG_OTHER RT_BIT_32(0)
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| 78 | /** Portable Executable. */
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| 79 | #define DBGF_EXEIMG_PE RT_BIT_32(1)
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| 80 | /** Linear eXecutable. */
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| 81 | #define DBGF_EXEIMG_LX RT_BIT_32(2)
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| 82 | /** Linear Executable. */
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| 83 | #define DBGF_EXEIMG_LE RT_BIT_32(3)
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| 84 | /** New Executable. */
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| 85 | #define DBGF_EXEIMG_NE RT_BIT_32(4)
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| 86 | /** DOS Executable (Mark Zbikowski). */
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| 87 | #define DBGF_EXEIMG_MZ RT_BIT_32(5)
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| 88 | /** COM Executable. */
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| 89 | #define DBGF_EXEIMG_COM RT_BIT_32(6)
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| 90 | /** a.out Executable. */
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| 91 | #define DBGF_EXEIMG_AOUT RT_BIT_32(7)
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| 92 | /** Executable and Linkable Format. */
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| 93 | #define DBGF_EXEIMG_ELF RT_BIT_32(8)
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| 94 | /** Mach-O Executable (including FAT ones). */
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| 95 | #define DBGF_EXEIMG_MACHO RT_BIT_32(9)
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| 96 | /** @} */
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| 97 |
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| 98 | /** Pointer to a module. */
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| 99 | typedef struct DBGFMOD *PDBGFMOD;
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Virtual method table for executable image interpreters.
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| 104 | */
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| 105 | typedef struct DBGFMODVTIMG
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| 106 | {
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| 107 | /** Magic number (DBGFMODVTIMG_MAGIC). */
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| 108 | uint32_t u32Magic;
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| 109 | /** Mask of supported debug info types, see grp_dbgf_exeimg.
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| 110 | * Used to speed up the search for a suitable interpreter. */
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| 111 | uint32_t fSupports;
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| 112 | /** The name of the interpreter. */
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| 113 | const char *pszName;
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| 114 |
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| 115 | /**
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| 116 | * Try open the image.
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| 117 | *
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| 118 | * This combines probing and opening.
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| 119 | *
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| 120 | * @returns VBox status code. No informational returns defined.
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| 121 | *
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| 122 | * @param pMod Pointer to the module that is being opened.
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| 123 | *
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| 124 | * The DBGFMOD::pszDbgFile member will point to
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| 125 | * the filename of any debug info we're aware of
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| 126 | * on input. Also, or alternatively, it is expected
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| 127 | * that the interpreter will look for debug info in
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| 128 | * the executable image file when present and that it
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| 129 | * may ask the image interpreter for this when it's
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| 130 | * around.
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| 131 | *
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| 132 | * Upon successful return the method is expected to
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| 133 | * initialize pDbgOps and pvDbgPriv.
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| 134 | */
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| 135 | DECLCALLBACKMEMBER(int, pfnTryOpen,(PDBGFMOD pMod));
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| 136 |
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| 137 | /**
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| 138 | * Close the interpreter, freeing all associated resources.
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| 139 | *
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| 140 | * The caller sets the pDbgOps and pvDbgPriv DBGFMOD members
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| 141 | * to NULL upon return.
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| 142 | *
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| 143 | * @param pMod Pointer to the module structure.
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| 144 | */
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| 145 | DECLCALLBACKMEMBER(int, pfnClose,(PDBGFMOD pMod));
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| 146 |
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| 147 | } DBGFMODVTIMG
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| 148 |
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| 149 | /**
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| 150 | * Virtual method table for debug info interpreters.
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| 151 | */
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| 152 | typedef struct DBGFMODVTDBG
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| 153 | {
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| 154 | /** Magic number (DBGFMODVTDBG_MAGIC). */
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| 155 | uint32_t u32Magic;
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| 156 | /** Mask of supported debug info types, see grp_dbgf_dbginfo.
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| 157 | * Used to speed up the search for a suitable interpreter. */
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| 158 | uint32_t fSupports;
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| 159 | /** The name of the interpreter. */
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| 160 | const char *pszName;
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| 161 |
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| 162 | /**
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| 163 | * Try open the image.
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| 164 | *
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| 165 | * This combines probing and opening.
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| 166 | *
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| 167 | * @returns VBox status code. No informational returns defined.
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| 168 | *
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| 169 | * @param pMod Pointer to the module that is being opened.
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| 170 | *
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| 171 | * The DBGFMOD::pszDbgFile member will point to
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| 172 | * the filename of any debug info we're aware of
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| 173 | * on input. Also, or alternatively, it is expected
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| 174 | * that the interpreter will look for debug info in
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| 175 | * the executable image file when present and that it
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| 176 | * may ask the image interpreter for this when it's
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| 177 | * around.
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| 178 | *
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| 179 | * Upon successful return the method is expected to
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| 180 | * initialize pDbgOps and pvDbgPriv.
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| 181 | */
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| 182 | DECLCALLBACKMEMBER(int, pfnTryOpen,(PDBGFMOD pMod));
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| 183 |
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| 184 | /**
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| 185 | * Close the interpreter, freeing all associated resources.
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| 186 | *
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| 187 | * The caller sets the pDbgOps and pvDbgPriv DBGFMOD members
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| 188 | * to NULL upon return.
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| 189 | *
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| 190 | * @param pMod Pointer to the module structure.
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| 191 | */
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| 192 | DECLCALLBACKMEMBER(int, pfnClose,(PDBGFMOD pMod));
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| 193 |
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| 194 | /**
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| 195 | * Queries symbol information by symbol name.
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| 196 | *
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| 197 | * @returns VBox status code.
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| 198 | * @retval VINF_SUCCESS on success, no informational status code.
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| 199 | * @retval VERR_DBGF_NO_SYMBOLS if there aren't any symbols.
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| 200 | * @retval VERR_SYMBOL_NOT_FOUND if no suitable symbol was found.
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| 201 | *
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| 202 | * @param pMod Pointer to the module structure.
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| 203 | * @param pszSymbol The symbol name.
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| 204 | * @para pSymbol Where to store the symbol information.
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| 205 | */
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| 206 | DECLCALLBACKMEMBER(int, pfnSymbolByName,(PDBGFMOD pMod, const char *pszSymbol, PDBGFSYMBOL pSymbol));
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| 207 |
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| 208 | /**
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| 209 | * Queries symbol information by address.
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| 210 | *
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| 211 | * The returned symbol is what the debug info interpreter considers the symbol
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| 212 | * most applicable to the specified address. This usually means a symbol with an
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| 213 | * address equal or lower than the requested.
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| 214 | *
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| 215 | * @returns VBox status code.
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| 216 | * @retval VINF_SUCCESS on success, no informational status code.
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| 217 | * @retval VERR_DBGF_NO_SYMBOLS if there aren't any symbols.
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| 218 | * @retval VERR_SYMBOL_NOT_FOUND if no suitable symbol was found.
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| 219 | *
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| 220 | * @param pMod Pointer to the module structure.
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| 221 | * @param iSeg The segment number (0-based). DBGF_SEG_RVA can be used.
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| 222 | * @param off The offset into the segment.
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| 223 | * @param poffDisp Where to store the distance between the specified address
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| 224 | * and the returned symbol. Optional.
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| 225 | * @param pSymbol Where to store the symbol information.
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| 226 | */
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| 227 | DECLCALLBACKMEMBER(int, pfnSymbolByAddr,(PDBGFMOD pMod, uint32_t iSeg, RTGCUINTPTR off, PRTGCINTPTR poffDisp, PDBGFSYMBOL pSymbol));
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| 228 |
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| 229 | /**
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| 230 | * Queries line number information by address.
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| 231 | *
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| 232 | * @returns VBox status code.
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| 233 | * @retval VINF_SUCCESS on success, no informational status code.
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| 234 | * @retval VERR_DBGF_NO_LINE_NUMBERS if there aren't any line numbers.
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| 235 | * @retval VERR_DBGF_LINE_NOT_FOUND if no suitable line number was found.
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| 236 | *
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| 237 | * @param pMod Pointer to the module structure.
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| 238 | * @param iSeg The segment number (0-based). DBGF_SEG_RVA can be used.
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| 239 | * @param off The offset into the segment.
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| 240 | * @param poffDisp Where to store the distance between the specified address
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| 241 | * and the returned line number. Optional.
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| 242 | * @param pLine Where to store the information about the closest line number.
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| 243 | */
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| 244 | DECLCALLBACKMEMBER(int, pfnLineByAddr,(PDBGFMOD pMod, uint32_t iSeg, RTGCUINTPTR off, PRTGCINTPTR poffDisp, PDBGFLINE pLine));
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| 245 |
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| 246 | /**
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| 247 | * Adds a symbol to the module (optional).
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| 248 | *
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| 249 | * This method is used to implement DBGFR3SymbolAdd.
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| 250 | *
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| 251 | * @returns VBox status code.
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| 252 | * @retval VERR_NOT_SUPPORTED if the interpreter doesn't support this feature.
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| 253 | *
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| 254 | * @param pMod Pointer to the module structure.
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| 255 | * @param pszSymbol The symbol name.
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| 256 | * @param iSeg The segment number (0-based). DBGF_SEG_RVA can be used.
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| 257 | * @param off The offset into the segment.
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| 258 | * @param cbSymbol The area covered by the symbol. 0 is fine.
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| 259 | */
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| 260 | DECLCALLBACKMEMBER(int, pfnSymbolAdd,(PDBGFMOD pMod, const char *pszSymbol, uint32_t iSeg, RTGCUINTPTR off, RTUINT cbSymbol));
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| 261 |
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| 262 | /** For catching initialization errors (DBGFMODVTDBG_MAGIC). */
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| 263 | uint32_t u32EndMagic;
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| 264 | } DBGFMODVTDBG;
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| 265 |
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| 266 | #define DBGFMODVTDBG_MAGIC 123
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| 267 |
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| 268 | /**
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| 269 | * Module.
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| 270 | */
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| 271 | typedef struct DBGFMOD
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| 272 | {
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| 273 | /** Magic value (DBGFMOD_MAGIC). */
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| 274 | uint32_t u32Magic;
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| 275 | /** The number of address spaces this module is currently linked into.
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| 276 | * This is used to perform automatic cleanup and sharing. */
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| 277 | uint32_t cLinks;
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| 278 | /** The module name (short). */
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| 279 | const char *pszName;
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| 280 | /** The module filename. Can be NULL. */
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| 281 | const char *pszImgFile;
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| 282 | /** The debug info file (if external). Can be NULL. */
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| 283 | const char *pszDbgFile;
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| 284 |
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| 285 | /** The method table for the executable image interpreter. */
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| 286 | PCDBGFMODVTIMG pImgVt;
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| 287 | /** Pointer to the private data of the executable image interpreter. */
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| 288 | void *pvImgPriv;
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| 289 |
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| 290 | /** The method table for the debug info interpreter. */
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| 291 | PCDBGFMODVTDBG pDbgVt;
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| 292 | /** Pointer to the private data of the debug info interpreter. */
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| 293 | void *pvDbgPriv;
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| 294 |
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| 295 | } DBGFMOD;
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| 296 |
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| 297 | #define DBGFMOD_MAGIC 0x12345678
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| 298 |
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| 299 | #endif
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| 300 |
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