| 1 | /* $Id: omf.h 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Relocatable Object Module Format (OMF).
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| 4 | *
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| 5 | * @remarks For a more details description, see specification from Tools
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| 6 | * Interface Standards (TIS), version 1.1 dated May 2015.
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| 7 | * Typically named found as OMF_v1.1.pdf.
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 12 | *
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| 13 | * This file is part of VirtualBox base platform packages, as
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| 14 | * available from https://www.virtualbox.org.
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| 15 | *
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| 16 | * This program is free software; you can redistribute it and/or
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| 17 | * modify it under the terms of the GNU General Public License
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| 18 | * as published by the Free Software Foundation, in version 3 of the
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| 19 | * License.
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| 20 | *
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| 21 | * This program is distributed in the hope that it will be useful, but
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| 22 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 24 | * General Public License for more details.
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| 25 | *
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| 26 | * You should have received a copy of the GNU General Public License
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| 27 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 28 | *
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| 29 | * The contents of this file may alternatively be used under the terms
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| 30 | * of the Common Development and Distribution License Version 1.0
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| 31 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 32 | * in the VirtualBox distribution, in which case the provisions of the
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| 33 | * CDDL are applicable instead of those of the GPL.
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| 34 | *
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| 35 | * You may elect to license modified versions of this file under the
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| 36 | * terms and conditions of either the GPL or the CDDL or both.
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| 37 | *
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| 38 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 39 | */
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| 40 |
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| 41 | #ifndef IPRT_INCLUDED_formats_omf_h
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| 42 | #define IPRT_INCLUDED_formats_omf_h
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| 43 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 44 | # pragma once
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| 45 | #endif
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| 46 |
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| 47 | #include <iprt/stdint.h>
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| 48 | #include <iprt/assertcompile.h>
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| 49 |
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| 50 |
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| 51 | /** @defgroup grp_rt_formats_omf Relocatable Object Module Format (OMF) structures and definitions
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| 52 | * @ingroup grp_rt_formats
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| 53 | * @{
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| 54 | */
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| 55 |
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| 56 | /**
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| 57 | * OMF record header.
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| 58 | */
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| 59 | #pragma pack(1)
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| 60 | typedef struct OMFRECHDR
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| 61 | {
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| 62 | /** The record type. */
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| 63 | uint8_t bType;
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| 64 | /** The record length, excluding the this header. */
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| 65 | uint16_t cbLen;
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| 66 | } OMFRECHDR;
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| 67 | #pragma pack()
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| 68 | AssertCompileSize(OMFRECHDR, 3);
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| 69 | /** Pointer to an OMF header. */
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| 70 | typedef OMFRECHDR *POMFRECHDR;
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| 71 | /** Pointer to a const OMF header. */
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| 72 | typedef OMFRECHDR *PCOMFRECHDR;
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| 73 |
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| 74 | /** The max OMF record length, including the header. */
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| 75 | #define OMF_MAX_RECORD_LENGTH UINT16_C(1024)
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| 76 |
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| 77 | /** The max OMF record payload, including CRC byte. */
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| 78 | #define OMF_MAX_RECORD_PAYLOAD UINT16_C(1021)
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| 79 |
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| 80 |
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| 81 | /** @name OMF Record Types (OMFRECHDR::bType).
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| 82 | * @{ */
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| 83 | /** Record type flag indicating 32-bit record. */
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| 84 | #define OMF_REC32 UINT8_C(0x01)
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| 85 | /** Object file header record.
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| 86 | * Is followed by a length prefixed string */
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| 87 | #define OMF_THEADR UINT8_C(0x80)
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| 88 | /** Comment record.
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| 89 | * Is followed by a comment type byte and a commen class byte, thereafter comes
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| 90 | * type specific byte sequence. */
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| 91 | #define OMF_COMENT UINT8_C(0x88)
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| 92 | /** Local name table referenced by segment and group defintions.
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| 93 | * Array of length prefixed strings. Multi record. */
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| 94 | #define OMF_LNAMES UINT8_C(0x96)
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| 95 | /** 16-bit segment definition.
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| 96 | * Complicated, see TIS docs. */
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| 97 | #define OMF_SEGDEF16 UINT8_C(0x98)
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| 98 | /** 32-bit segment definition.
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| 99 | * Complicated, see TIS docs. */
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| 100 | #define OMF_SEGDEF32 UINT8_C(0x99)
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| 101 | /** Segment group definition.
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| 102 | * Starts with an LNAMES index (one or two bytes) of the group name. Followed
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| 103 | * by an array which entries consists of a 0xff byte and a segment
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| 104 | * defintion index (one or two bytes). */
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| 105 | #define OMF_GRPDEF UINT8_C(0x9a)
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| 106 | /** External symbol defintions.
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| 107 | * Array where each entry is a length prefixed symbol name string followed by a
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| 108 | * one or two byte type number. */
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| 109 | #define OMF_EXTDEF UINT8_C(0x8c)
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| 110 | /** 16-but public symbol definitions.
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| 111 | * Starts with a group index (one or two bytes) and a segment index (ditto)
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| 112 | * which indicates which group/segment the symbols belong to.
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| 113 | * Is followed by an array with entries consiting of a length prefixed symbol
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| 114 | * name string, a two byte segment offset, and a one or two byte type index. */
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| 115 | #define OMF_PUBDEF16 UINT8_C(0x90)
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| 116 | /** 32-but public symbol definitions.
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| 117 | * Identical to #OMF_PUBDEF16 except that the symbol offset field is four
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| 118 | * byte. */
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| 119 | #define OMF_PUBDEF32 UINT8_C(0x91)
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| 120 | /** 16-bit local symbol definitions.
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| 121 | * Same format as #OMF_PUBDEF16. */
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| 122 | #define OMF_LPUBDEF16 UINT8_C(0xb6)
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| 123 | /** 16-bit local symbol definitions.
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| 124 | * Same format as #OMF_PUBDEF32. */
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| 125 | #define OMF_LPUBDEF32 UINT8_C(0xb7)
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| 126 | /** Logical enumerated data record (a chunk of raw segment bits).
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| 127 | * Starts with the index of the segment it contributes to (one or two bytes) and
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| 128 | * is followed by the offset into the segment of the bytes (two bytes).
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| 129 | * After that comes the raw data bytes. */
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| 130 | #define OMF_LEDATA16 UINT8_C(0xa0)
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| 131 | /** Logical enumerated data record (a chunk of raw segment bits).
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| 132 | * Identical to #OMF_LEDATA16 except that is has a the segment offset field is
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| 133 | * four bytes. */
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| 134 | #define OMF_LEDATA32 UINT8_C(0xa1)
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| 135 | /** 16-bit fixup record.
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| 136 | * Complicated, see TIS docs. */
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| 137 | #define OMF_FIXUPP16 UINT8_C(0x9c)
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| 138 | /** 32-bit fixup record.
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| 139 | * Complicated, see TIS docs. */
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| 140 | #define OMF_FIXUPP32 UINT8_C(0x9d)
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| 141 | /** 16-bit line numbers record. */
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| 142 | #define OMF_LINNUM16 UINT8_C(0x94)
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| 143 | /** 32-bit line numbers record. */
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| 144 | #define OMF_LINNUM32 UINT8_C(0x95)
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| 145 | /** 16-bit object file end record.
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| 146 | * Duh! wrong bitfield order.
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| 147 | *
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| 148 | * Starts with a byte bitfield indicating module type: bit 0 is set if this is a
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| 149 | * main program module; bit 1 is set if this is a start address is available;
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| 150 | * bits 2 thru 6 are reserved and must be zero; bit 7 is set to indicate
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| 151 | * a non-absolute start address.
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| 152 | *
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| 153 | * When bit 1 is set what follow is: A FIXUPP byte, one or two byte frame datum,
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| 154 | * one or two byte target datum, and a 2 byte target displacement. */
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| 155 | #define OMF_MODEND16 UINT8_C(0x8a)
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| 156 | /** 32-bit object file end record.
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| 157 | * Identical to #OMF_MODEND16 except that is has a 4 byte target
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| 158 | * displacement field. */
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| 159 | #define OMF_MODEND32 UINT8_C(0x8b)
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| 160 | /** @} */
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| 161 |
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| 162 | /** @name OMF COMENT Type Flags
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| 163 | * @{ */
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| 164 | /** Comment type: Don't remove comment when object is manipulated. */
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| 165 | #define OMF_CTYP_NO_PURGE UINT8_C(0x80)
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| 166 | /** Comment type: Don't include in object listing. */
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| 167 | #define OMF_CTYP_NO_LIST UINT8_C(0x40)
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| 168 | /** @} */
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| 169 |
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| 170 | /** @name OMF COMENT Classes
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| 171 | * @{ */
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| 172 | /** Comment class: Dependency file.
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| 173 | * Is followed by a dword timestamp (1980 based?) and a length prefix
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| 174 | * filename string. */
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| 175 | #define OMF_CCLS_DEP_FILE UINT8_C(0x88)
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| 176 | /** Comment class: Link pass separator.
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| 177 | * Contains a byte with the value 01 to indicate the linker can stop pass 1
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| 178 | * processing now. */
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| 179 | #define OMF_CCLS_LINK_PASS_SEP UINT8_C(0xa2)
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| 180 | /** Comment class: Borland type information. */
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| 181 | #define OMF_CCLS_BORLAND_TYPES UINT8_C(0xe3)
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| 182 | /** Comment class: Borland symbol information. */
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| 183 | #define OMF_CCLS_BORLAND_SYMBOLS UINT8_C(0xe6)
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| 184 | /** Comment class: Borland source file (applies to subsequent LINNUMs). */
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| 185 | #define OMF_CCLS_BORLAND_SRC_FILE UINT8_C(0xe8)
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| 186 | /** Comment class: Borland dependency files. */
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| 187 | #define OMF_CCLS_BORLAND_DEP_FILES UINT8_C(0xe9)
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| 188 | /** @} */
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| 189 |
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| 190 | /** @name OMF SEGDEF Attrib.
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| 191 | * @{ */
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| 192 | #define OMF_SEG_ATTR_ALIGN_ABS (UINT8_C(0) << 5) /**< SEGDEF attrib A: absolute - frame and offset fields present. */
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| 193 | #define OMF_SEG_ATTR_ALIGN_BYTE (UINT8_C(1) << 5) /**< SEGDEF attrib A: 1-byte alignment. */
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| 194 | #define OMF_SEG_ATTR_ALIGN_WORD (UINT8_C(2) << 5) /**< SEGDEF attrib A: 2-byte alignment. */
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| 195 | #define OMF_SEG_ATTR_ALIGN_PARA (UINT8_C(3) << 5) /**< SEGDEF attrib A: 16-byte alignment. */
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| 196 | #define OMF_SEG_ATTR_ALIGN_PAGE (UINT8_C(4) << 5) /**< SEGDEF attrib A: 4096-byte alignment (or 256-byte). */
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| 197 | #define OMF_SEG_ATTR_ALIGN_DWORD (UINT8_C(5) << 5) /**< SEGDEF attrib A: 4-byte alignment. */
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| 198 | #define OMF_SEG_ATTR_ALIGN_6 (UINT8_C(6) << 5) /**< SEGDEF attrib A: not supported (load-time locatable, paragraph aligned). */
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| 199 | #define OMF_SEG_ATTR_ALIGN_7 (UINT8_C(7) << 5) /**< SEGDEF attrib A: undefined. */
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| 200 | #define OMF_SEG_ATTR_ALIGN_MASK (UINT8_C(7) << 5) /**< SEGDEF attrib A: Mask for the alignment field. */
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| 201 | #define OMF_SEG_ATTR_ALIGN_SHIFT 5 /**< SEGDEF attrib A: Shift count for the alignment field. */
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| 202 |
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| 203 | #define OMF_SEG_ATTR_COMB_PRIVATE (UINT8_C(0) << 2) /**< SEGDEF attrib C: Private - do not combine with anyone. */
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| 204 | #define OMF_SEG_ATTR_COMB_1 (UINT8_C(1) << 2) /**< SEGDEF attrib C: Reserved */
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| 205 | #define OMF_SEG_ATTR_COMB_PUBLIC (UINT8_C(2) << 2) /**< SEGDEF attrib C: Public - append at offset meeting alignment. */
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| 206 | #define OMF_SEG_ATTR_COMB_3 (UINT8_C(3) << 2) /**< SEGDEF attrib C: Reserved */
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| 207 | #define OMF_SEG_ATTR_COMB_PUBLIC_4 (UINT8_C(4) << 2) /**< SEGDEF attrib C: Public - append at offset meeting alignment. */
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| 208 | #define OMF_SEG_ATTR_COMB_STACK (UINT8_C(5) << 2) /**< SEGDEF attrib C: Stack - same as public, but forced byte alignment. */
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| 209 | #define OMF_SEG_ATTR_COMB_COMMON (UINT8_C(6) << 2) /**< SEGDEF attrib C: Common - overlay using maximum size. */
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| 210 | #define OMF_SEG_ATTR_COMB_PUBLIC_7 (UINT8_C(5) << 2) /**< SEGDEF attrib C: Public - append at offset meeting alignment. */
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| 211 | #define OMF_SEG_ATTR_COMB_MASK (UINT8_C(7) << 2) /**< SEGDEF attrib C: Mask for the combination field. */
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| 212 | #define OMF_SEG_ATTR_COMB_SHIFT 2 /**< SEGDEF attrib C: Shift count for the combination field. */
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| 213 | #define OMF_SEG_ATTR_BIG UINT8_C(2) /**< SEGDEF attrib B: Big segment 64K / 4GB. */
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| 214 | #define OMF_SEG_ATTR_USE32 UINT8_C(1) /**< SEGDEF attrib P: Indicates 32-bit data or code. */
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| 215 | #define OMF_SEG_ATTR_USE16 UINT8_C(0) /**< SEGDEF attrib ~P: Just for spelling out !USE32. */
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| 216 | /** @} */
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| 217 |
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| 218 |
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| 219 | /** @name OMF FIXUPP Locations.
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| 220 | * @{ */
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| 221 | #define OMF_FIX_LOC_8BIT_LOW_BYTE UINT8_C(0) /**< FIXUP location: low byte (offset or displacement). */
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| 222 | #define OMF_FIX_LOC_16BIT_OFFSET UINT8_C(1) /**< FIXUP location: 16-bit offset. */
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| 223 | #define OMF_FIX_LOC_16BIT_SEGMENT UINT8_C(2) /**< FIXUP location: 16-bit segment. */
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| 224 | #define OMF_FIX_LOC_1616FAR UINT8_C(3) /**< FIXUP location: 16:16 far pointer. */
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| 225 | #define OMF_FIX_LOC_8BIT_HIGH_BYTE UINT8_C(4) /**< FIXUP location: high byte (offset). Not supported by MS/IBM. */
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| 226 | #define OMF_FIX_LOC_16BIT_OFFSET_LDR UINT8_C(5) /**< FIXUP location: 16-bit loader resolved offset, same a 1 for linker. PharLab conflict. */
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| 227 | #define OMF_FIX_LOC_RESERVED_FAR1632 UINT8_C(6) /**< FIXUP location: PharLab 16:32 far pointers, not defined by MS/IBM. */
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| 228 | #define OMF_FIX_LOC_RESERVED_7 UINT8_C(7) /**< FIXUP location: Not defined. */
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| 229 | #define OMF_FIX_LOC_RESERVED_8 UINT8_C(8) /**< FIXUP location: Not defined. */
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| 230 | #define OMF_FIX_LOC_32BIT_OFFSET UINT8_C(9) /**< FIXUP location: 32-bit offset. */
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| 231 | #define OMF_FIX_LOC_RESERVED_10 UINT8_C(10) /**< FIXUP location: Not defined. */
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| 232 | #define OMF_FIX_LOC_1632FAR UINT8_C(11) /**< FIXUP location: 16:32 far pointer. */
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| 233 | #define OMF_FIX_LOC_RESERVED_12 UINT8_C(12) /**< FIXUP location: Not defined. */
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| 234 | #define OMF_FIX_LOC_32BIT_OFFSET_LDR UINT8_C(13) /**< FIXUP location: 32-bit loader resolved offset, same as 9 for linker. */
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| 235 | /** @} */
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| 236 | /** @name OMF FIXUPP Targets
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| 237 | * @{ */
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| 238 | #define OMF_FIX_T_SEGDEF UINT8_C(0) /**< FIXUP target: SEGDEF index. */
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| 239 | #define OMF_FIX_T_GRPDEF UINT8_C(1) /**< FIXUP target: GRPDEF index. */
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| 240 | #define OMF_FIX_T_EXTDEF UINT8_C(2) /**< FIXUP target: EXTDEF index. */
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| 241 | #define OMF_FIX_T_FRAME_NO UINT8_C(3) /**< FIXUP target: Explicit frame number, not supported by MS/IBM. */
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| 242 | #define OMF_FIX_T_SEGDEF_NO_DISP UINT8_C(4) /**< FIXUP target: SEGDEF index only, displacement take as 0. */
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| 243 | #define OMF_FIX_T_GRPDEF_NO_DISP UINT8_C(5) /**< FIXUP target: GRPDEF index only, displacement take as 0. */
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| 244 | #define OMF_FIX_T_EXTDEF_NO_DISP UINT8_C(6) /**< FIXUP target: EXTDEF index only, displacement take as 0. */
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| 245 | /** @} */
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| 246 | /** @name OMF FIXUPP Frames
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| 247 | * @{ */
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| 248 | #define OMF_FIX_F_SEGDEF UINT8_C(0) /**< FIXUP frame: SEGDEF index. */
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| 249 | #define OMF_FIX_F_GRPDEF UINT8_C(1) /**< FIXUP frame: GRPDEF index. */
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| 250 | #define OMF_FIX_F_EXTDEF UINT8_C(2) /**< FIXUP frame: EXTDEF index. */
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| 251 | #define OMF_FIX_F_FRAME_NO UINT8_C(3) /**< FIXUP frame: Explicit frame number, not supported by any linkers. */
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| 252 | #define OMF_FIX_F_LXDATA_SEG UINT8_C(4) /**< FIXUP frame: Determined from the data being fixed up. (No index field.) */
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| 253 | #define OMF_FIX_F_TARGET_SEG UINT8_C(5) /**< FIXUP frame: Determined from the target. (No index field.) */
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| 254 | #define OMF_FIX_F_RESERVED_6 UINT8_C(6) /**< FIXUP frame: Reserved. */
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| 255 | /** @} */
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| 256 |
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| 257 |
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| 258 | /** @} */
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| 259 | #endif /* !IPRT_INCLUDED_formats_omf_h */
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| 260 |
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