Relocatable Object Module Format (OMF) Specification

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Relocatable Object Module Format Identifier Record(s) THEADR or LHEADR record Note: This must be the first record. Records Processed by Pass 1 The following records may occur in any order but they must precede the Link Pass Separator if it is present: COMENT records identifying object format and extensions COMENT records other than Link Pass Separator comment LNAMES or LLNAMES records providing ordered name list SEGDEF records providing ordered list of program segments GRPDEF records providing ordered list of logical segments TYPDEF records (obsolete) ALIAS records PUBDEF records locating and naming public symbols LPUBDEF records locating and naming private symbols COMDEF, LCOMDEF, EXTDEF, LEXTDEF, and CEXTDEF records Note: This group of records is indexed together, so external name index fields in FIXUPP records may refer to any of the record types listed. Link Pass Separator (Optional) COMENT class A2 record is used to indicate that Pass 1 of the linker is complete. When this record is encountered, many linkers stop their first pass over the object file. Records preceding the link pass separator define the symbolic information for the file. For greater linking speed, all LIDATA, LEDATA, FIXUPP, BAKPAT, INCDEF, and LINNUM records should come after the A2 COMENT record, but this is not required. Pass 2 should begin again at the start of the object module so that these records are processed in Pass 2 regardless of where they are placed in the object module. 4 OMF Specification, Version 1.1 Tool Interface Standards (TIS)
Relocatable Object Module Format Records Ignored by Pass 1 and Processed by Pass 2 The following records may come before or after the Link Pass Separator: LIDATA, LEDATA, or COMDAT records followed by applicable FIXUPP records FIXUPP records containing only THREAD subrecords BAKPAT and NBKPAT FIXUPP records COMENT class A0, subrecord type 03 (INCDEF) records containing incremental compilation information for FIXUPP and LINNUM records LINNUM and LINSYM records providing line number and program code or data association Terminator MODEND record indicating end of module with optional start address Tool Interface Standards (TIS) OMF Specification, Version 1.1 5
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Relocatable Object Module Format (OMF) Specification

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