1 | /* $Id: omf.h 82968 2020-02-04 10:35:17Z 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) 2006-2020 Oracle Corporation
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12 | *
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13 | * This file is part of VirtualBox Open Source Edition (OSE), as
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14 | * available from http://www.virtualbox.org. This file is free software;
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15 | * you can redistribute it and/or modify it under the terms of the GNU
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16 | * General Public License (GPL) as published by the Free Software
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17 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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18 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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19 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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20 | *
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21 | * The contents of this file may alternatively be used under the terms
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22 | * of the Common Development and Distribution License Version 1.0
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23 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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24 | * VirtualBox OSE distribution, in which case the provisions of the
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25 | * CDDL are applicable instead of those of the GPL.
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26 | *
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27 | * You may elect to license modified versions of this file under the
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28 | * terms and conditions of either the GPL or the CDDL or both.
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29 | */
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30 |
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31 | #ifndef IPRT_INCLUDED_formats_omf_h
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32 | #define IPRT_INCLUDED_formats_omf_h
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33 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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34 | # pragma once
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35 | #endif
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36 |
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37 | #include <iprt/stdint.h>
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38 | #include <iprt/assertcompile.h>
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39 |
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40 |
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41 | /** @defgroup grp_rt_formats_omf Relocatable Object Module Format (OMF) structures and definitions
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42 | * @ingroup grp_rt_formats
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43 | * @{
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44 | */
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45 |
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46 | /**
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47 | * OMF record header.
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48 | */
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49 | #pragma pack(1)
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50 | typedef struct OMFRECHDR
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51 | {
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52 | /** The record type. */
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53 | uint8_t bType;
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54 | /** The record length, excluding the this header. */
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55 | uint16_t cbLen;
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56 | } OMFRECHDR;
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57 | #pragma pack()
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58 | AssertCompileSize(OMFRECHDR, 3);
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59 | /** Pointer to an OMF header. */
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60 | typedef OMFRECHDR *POMFRECHDR;
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61 | /** Pointer to a const OMF header. */
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62 | typedef OMFRECHDR *PCOMFRECHDR;
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63 |
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64 | /** The max OMF record length, including the header. */
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65 | #define OMF_MAX_RECORD_LENGTH UINT16_C(1024)
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66 |
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67 | /** The max OMF record payload, including CRC byte. */
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68 | #define OMF_MAX_RECORD_PAYLOAD UINT16_C(1021)
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69 |
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70 |
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71 | /** @name OMF Record Types (OMFRECHDR::bType).
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72 | * @{ */
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73 | /** Record type flag indicating 32-bit record. */
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74 | #define OMF_REC32 UINT8_C(0x01)
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75 | /** Object file header record.
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76 | * Is followed by a length prefixed string */
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77 | #define OMF_THEADR UINT8_C(0x80)
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78 | /** Comment record.
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79 | * Is followed by a comment type byte and a commen class byte, thereafter comes
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80 | * type specific byte sequence. */
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81 | #define OMF_COMENT UINT8_C(0x88)
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82 | /** Local name table referenced by segment and group defintions.
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83 | * Array of length prefixed strings. Multi record. */
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84 | #define OMF_LNAMES UINT8_C(0x96)
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85 | /** 16-bit segment definition.
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86 | * Complicated, see TIS docs. */
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87 | #define OMF_SEGDEF16 UINT8_C(0x98)
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88 | /** 32-bit segment definition.
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89 | * Complicated, see TIS docs. */
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90 | #define OMF_SEGDEF32 UINT8_C(0x99)
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91 | /** Segment group definition.
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92 | * Starts with an LNAMES index (one or two bytes) of the group name. Followed
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93 | * by an array which entries consists of a 0xff byte and a segment
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94 | * defintion index (one or two bytes). */
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95 | #define OMF_GRPDEF UINT8_C(0x9a)
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96 | /** External symbol defintions.
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97 | * Array where each entry is a length prefixed symbol name string followed by a
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98 | * one or two byte type number. */
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99 | #define OMF_EXTDEF UINT8_C(0x8c)
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100 | /** 16-but public symbol definitions.
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101 | * Starts with a group index (one or two bytes) and a segment index (ditto)
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102 | * which indicates which group/segment the symbols belong to.
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103 | * Is followed by an array with entries consiting of a length prefixed symbol
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104 | * name string, a two byte segment offset, and a one or two byte type index. */
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105 | #define OMF_PUBDEF16 UINT8_C(0x90)
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106 | /** 32-but public symbol definitions.
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107 | * Identical to #OMF_PUBDEF16 except that the symbol offset field is four
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108 | * byte. */
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109 | #define OMF_PUBDEF32 UINT8_C(0x91)
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110 | /** 16-bit local symbol definitions.
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111 | * Same format as #OMF_PUBDEF16. */
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112 | #define OMF_LPUBDEF16 UINT8_C(0xb6)
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113 | /** 16-bit local symbol definitions.
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114 | * Same format as #OMF_PUBDEF32. */
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115 | #define OMF_LPUBDEF32 UINT8_C(0xb7)
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116 | /** Logical enumerated data record (a chunk of raw segment bits).
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117 | * Starts with the index of the segment it contributes to (one or two bytes) and
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118 | * is followed by the offset into the segment of the bytes (two bytes).
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119 | * After that comes the raw data bytes. */
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120 | #define OMF_LEDATA16 UINT8_C(0xa0)
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121 | /** Logical enumerated data record (a chunk of raw segment bits).
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122 | * Identical to #OMF_LEDATA16 except that is has a the segment offset field is
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123 | * four bytes. */
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124 | #define OMF_LEDATA32 UINT8_C(0xa1)
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125 | /** 16-bit fixup record.
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126 | * Complicated, see TIS docs. */
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127 | #define OMF_FIXUPP16 UINT8_C(0x9c)
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128 | /** 32-bit fixup record.
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129 | * Complicated, see TIS docs. */
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130 | #define OMF_FIXUPP32 UINT8_C(0x9d)
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131 | /** 16-bit line numbers record. */
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132 | #define OMF_LINNUM16 UINT8_C(0x94)
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133 | /** 32-bit line numbers record. */
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134 | #define OMF_LINNUM32 UINT8_C(0x95)
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135 | /** 16-bit object file end record.
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136 | * Duh! wrong bitfield order.
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137 | *
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138 | * Starts with a byte bitfield indicating module type: bit 0 is set if this is a
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139 | * main program module; bit 1 is set if this is a start address is available;
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140 | * bits 2 thru 6 are reserved and must be zero; bit 7 is set to indicate
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141 | * a non-absolute start address.
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142 | *
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143 | * When bit 1 is set what follow is: A FIXUPP byte, one or two byte frame datum,
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144 | * one or two byte target datum, and a 2 byte target displacement. */
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145 | #define OMF_MODEND16 UINT8_C(0x8a)
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146 | /** 32-bit object file end record.
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147 | * Identical to #OMF_MODEND16 except that is has a 4 byte target
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148 | * displacement field. */
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149 | #define OMF_MODEND32 UINT8_C(0x8b)
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150 | /** @} */
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151 |
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152 | /** @name OMF COMENT Type Flags
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153 | * @{ */
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154 | /** Comment type: Don't remove comment when object is manipulated. */
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155 | #define OMF_CTYP_NO_PURGE UINT8_C(0x80)
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156 | /** Comment type: Don't include in object listing. */
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157 | #define OMF_CTYP_NO_LIST UINT8_C(0x40)
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158 | /** @} */
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159 |
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160 | /** @name OMF COMENT Classes
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161 | * @{ */
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162 | /** Comment class: Dependency file.
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163 | * Is followed by a dword timestamp (1980 based?) and a length prefix
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164 | * filename string. */
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165 | #define OMF_CCLS_DEP_FILE UINT8_C(0x88)
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166 | /** Comment class: Link pass separator.
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167 | * Contains a byte with the value 01 to indicate the linker can stop pass 1
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168 | * processing now. */
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169 | #define OMF_CCLS_LINK_PASS_SEP UINT8_C(0xa2)
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170 | /** Comment class: Borland type information. */
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171 | #define OMF_CCLS_BORLAND_TYPES UINT8_C(0xe3)
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172 | /** Comment class: Borland symbol information. */
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173 | #define OMF_CCLS_BORLAND_SYMBOLS UINT8_C(0xe6)
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174 | /** Comment class: Borland source file (applies to subsequent LINNUMs). */
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175 | #define OMF_CCLS_BORLAND_SRC_FILE UINT8_C(0xe8)
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176 | /** Comment class: Borland dependency files. */
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177 | #define OMF_CCLS_BORLAND_DEP_FILES UINT8_C(0xe9)
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178 | /** @} */
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179 |
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180 | /** @name OMF SEGDEF Attrib.
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181 | * @{ */
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182 | #define OMF_SEG_ATTR_ALIGN_ABS (UINT8_C(0) << 5) /**< SEGDEF attrib A: absolute - frame and offset fields present. */
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183 | #define OMF_SEG_ATTR_ALIGN_BYTE (UINT8_C(1) << 5) /**< SEGDEF attrib A: 1-byte alignment. */
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184 | #define OMF_SEG_ATTR_ALIGN_WORD (UINT8_C(2) << 5) /**< SEGDEF attrib A: 2-byte alignment. */
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185 | #define OMF_SEG_ATTR_ALIGN_PARA (UINT8_C(3) << 5) /**< SEGDEF attrib A: 16-byte alignment. */
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186 | #define OMF_SEG_ATTR_ALIGN_PAGE (UINT8_C(4) << 5) /**< SEGDEF attrib A: 4096-byte alignment (or 256-byte). */
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187 | #define OMF_SEG_ATTR_ALIGN_DWORD (UINT8_C(5) << 5) /**< SEGDEF attrib A: 4-byte alignment. */
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188 | #define OMF_SEG_ATTR_ALIGN_6 (UINT8_C(6) << 5) /**< SEGDEF attrib A: not supported (load-time locatable, paragraph aligned). */
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189 | #define OMF_SEG_ATTR_ALIGN_7 (UINT8_C(7) << 5) /**< SEGDEF attrib A: undefined. */
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190 | #define OMF_SEG_ATTR_ALIGN_MASK (UINT8_C(7) << 5) /**< SEGDEF attrib A: Mask for the alignment field. */
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191 | #define OMF_SEG_ATTR_ALIGN_SHIFT 5 /**< SEGDEF attrib A: Shift count for the alignment field. */
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192 |
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193 | #define OMF_SEG_ATTR_COMB_PRIVATE (UINT8_C(0) << 2) /**< SEGDEF attrib C: Private - do not combine with anyone. */
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194 | #define OMF_SEG_ATTR_COMB_1 (UINT8_C(1) << 2) /**< SEGDEF attrib C: Reserved */
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195 | #define OMF_SEG_ATTR_COMB_PUBLIC (UINT8_C(2) << 2) /**< SEGDEF attrib C: Public - append at offset meeting alignment. */
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196 | #define OMF_SEG_ATTR_COMB_3 (UINT8_C(3) << 2) /**< SEGDEF attrib C: Reserved */
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197 | #define OMF_SEG_ATTR_COMB_PUBLIC_4 (UINT8_C(4) << 2) /**< SEGDEF attrib C: Public - append at offset meeting alignment. */
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198 | #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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199 | #define OMF_SEG_ATTR_COMB_COMMON (UINT8_C(6) << 2) /**< SEGDEF attrib C: Common - overlay using maximum size. */
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200 | #define OMF_SEG_ATTR_COMB_PUBLIC_7 (UINT8_C(5) << 2) /**< SEGDEF attrib C: Public - append at offset meeting alignment. */
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201 | #define OMF_SEG_ATTR_COMB_MASK (UINT8_C(7) << 2) /**< SEGDEF attrib C: Mask for the combination field. */
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202 | #define OMF_SEG_ATTR_COMB_SHIFT 2 /**< SEGDEF attrib C: Shift count for the combination field. */
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203 | #define OMF_SEG_ATTR_BIG UINT8_C(2) /**< SEGDEF attrib B: Big segment 64K / 4GB. */
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204 | #define OMF_SEG_ATTR_USE32 UINT8_C(1) /**< SEGDEF attrib P: Indicates 32-bit data or code. */
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205 | #define OMF_SEG_ATTR_USE16 UINT8_C(0) /**< SEGDEF attrib ~P: Just for spelling out !USE32. */
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206 | /** @} */
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207 |
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208 |
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209 | /** @name OMF FIXUPP Locations.
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210 | * @{ */
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211 | #define OMF_FIX_LOC_8BIT_LOW_BYTE UINT8_C(0) /**< FIXUP location: low byte (offset or displacement). */
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212 | #define OMF_FIX_LOC_16BIT_OFFSET UINT8_C(1) /**< FIXUP location: 16-bit offset. */
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213 | #define OMF_FIX_LOC_16BIT_SEGMENT UINT8_C(2) /**< FIXUP location: 16-bit segment. */
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214 | #define OMF_FIX_LOC_1616FAR UINT8_C(3) /**< FIXUP location: 16:16 far pointer. */
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215 | #define OMF_FIX_LOC_8BIT_HIGH_BYTE UINT8_C(4) /**< FIXUP location: high byte (offset). Not supported by MS/IBM. */
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216 | #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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217 | #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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218 | #define OMF_FIX_LOC_RESERVED_7 UINT8_C(7) /**< FIXUP location: Not defined. */
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219 | #define OMF_FIX_LOC_RESERVED_8 UINT8_C(8) /**< FIXUP location: Not defined. */
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220 | #define OMF_FIX_LOC_32BIT_OFFSET UINT8_C(9) /**< FIXUP location: 32-bit offset. */
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221 | #define OMF_FIX_LOC_RESERVED_10 UINT8_C(10) /**< FIXUP location: Not defined. */
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222 | #define OMF_FIX_LOC_1632FAR UINT8_C(11) /**< FIXUP location: 16:32 far pointer. */
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223 | #define OMF_FIX_LOC_RESERVED_12 UINT8_C(12) /**< FIXUP location: Not defined. */
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224 | #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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225 | /** @} */
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226 | /** @name OMF FIXUPP Targets
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227 | * @{ */
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228 | #define OMF_FIX_T_SEGDEF UINT8_C(0) /**< FIXUP target: SEGDEF index. */
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229 | #define OMF_FIX_T_GRPDEF UINT8_C(1) /**< FIXUP target: GRPDEF index. */
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230 | #define OMF_FIX_T_EXTDEF UINT8_C(2) /**< FIXUP target: EXTDEF index. */
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231 | #define OMF_FIX_T_FRAME_NO UINT8_C(3) /**< FIXUP target: Explicit frame number, not supported by MS/IBM. */
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232 | #define OMF_FIX_T_SEGDEF_NO_DISP UINT8_C(4) /**< FIXUP target: SEGDEF index only, displacement take as 0. */
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233 | #define OMF_FIX_T_GRPDEF_NO_DISP UINT8_C(5) /**< FIXUP target: GRPDEF index only, displacement take as 0. */
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234 | #define OMF_FIX_T_EXTDEF_NO_DISP UINT8_C(6) /**< FIXUP target: EXTDEF index only, displacement take as 0. */
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235 | /** @} */
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236 | /** @name OMF FIXUPP Frames
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237 | * @{ */
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238 | #define OMF_FIX_F_SEGDEF UINT8_C(0) /**< FIXUP frame: SEGDEF index. */
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239 | #define OMF_FIX_F_GRPDEF UINT8_C(1) /**< FIXUP frame: GRPDEF index. */
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240 | #define OMF_FIX_F_EXTDEF UINT8_C(2) /**< FIXUP frame: EXTDEF index. */
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241 | #define OMF_FIX_F_FRAME_NO UINT8_C(3) /**< FIXUP frame: Explicit frame number, not supported by any linkers. */
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242 | #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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243 | #define OMF_FIX_F_TARGET_SEG UINT8_C(5) /**< FIXUP frame: Determined from the target. (No index field.) */
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244 | #define OMF_FIX_F_RESERVED_6 UINT8_C(6) /**< FIXUP frame: Reserved. */
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245 | /** @} */
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246 |
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247 |
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248 | /** @} */
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249 | #endif /* !IPRT_INCLUDED_formats_omf_h */
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250 |
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