Llllllllllllll | Intel 121748-001 specification

8086 Object Module Formats

Version 4.8

l.4 (8089) Self-Relative Reference To An EXTERNAL Symbol

A LLLLLLLLLLLLLL <- PP				? ••••••••••••••
L --------		+	L	•	•
L +			L	•••••••••••• <- PT
L I	LOC	1--------------------		>	SYM ••
L +--------		+	L	. .......... .
L			L

LLLLLLLLLLLLLL..............

FIXUP REPRESENTATION:

LOCATION: OFFSET

PSEG: SI (A) (thi sis the most common cho ice)

TARGET: EI(SYM) rd

or EI(SYM) if the offset is in LOCATION

There are two waY$ in which an 8~89 self-relative reference to an external symbol may be resolved.

CASE I: The EXTERNAL symbol (!;Y:-1)is found (by LINK) to be in a different LSEG, B.

CASE 2: The EXTERNAL symbol (SYM) is found (by LINK) to be absolute.

lA7

Image 107

Intel 121748-001 manual Llllllllllllll, Fixup Representation Location Offset

Contents

Relocatable Object Module Formats IA 500/1181/500 IPI Control ContentsSymbol Definition Type Definition Hecord Symbol Appendices Numeric List of Record Types Library Dictionary Record Comment RecordPage Page Page Page Module Identification Segment Addressing Data Indices Page Page Target Sicode ,1024 IndexTarget Target Frame NumberPage Frame F11F21 SEGMENT-RELATIVE Fixups Target Eistruct ,24 Fixup RecordCase +------+ Oata Frame Sifoo Target Eiary Frame Sifoo Target Eiary ,0000HFrame Sifoo Target Eiary ,-2 Frame Sifoo Target Eistrct ,99 Rheadr Record OrderTheadr LheadrPage Official Abbreviation 1111Number Repeated or Conditional Fields Number Module Name Module Header RecordREC Record CHK Lheadr REC Record TYP Length OAT Record Count Offset Overlay Dynamic Maximum Size Static Storage Module InfoStatic Page Record * Name Length List OF· NAMES. Record OAT NameOFF LTL MXY LX+LY+GLX+LY Segment Length Overlay Name Index Segment NAME. IndexClass Name Index Index FFHFEH Segment Object Module Formats VersionFDH Z I Z I Z I Z I Z Ibglibgm I I I 80B6 Object Module Formats Eight Leaf Descriptor Type Definition RecordREC Record Name Eight CHK TY P Length Leaf SUM SEH USE Descriptor 129 Object Module FormatsVersion 133 127 Page Puslic Base Public Names DefinitionREC Record Public Public Type CHK TYP Public Offset Frame TargetFrame GI G Type Index 8CH Extdef REC Record ~il·E. Index REC Record Local Type TYP Length SymbolsLocal Symbols Base Local SY~BOLS. Record Type Index Local Symbol NameLocal S~~BOL Offset Line NU!\1BER Sase Line Numbers Record Linnum RECTYP Length May 8986 Ob·ject Module Formats Version Block Base Record Block Procedure Type CHK TYP Length BaseBlock Definition Record Index SUM 7AH Block Length Block Name Offset Address Offset Procedure InformationReturn Length SUM 7CH TYPBlkend REC Record CHK Datum REC RecordTYP Length Information Offset Index SUM If Frame ~ETHOD=0, the Datum has the format Block Index Symbol Name Data Record Offset Relocatable Enumerated Data RecordOAT * CHK TY P Data Record Base DAT Data Record Offset REC RecordIterated Data Record Base Block Count Repeat Block Count Content Repeat CountIterated Data Block Frame NU....,SER Physical Enumerated Data Record Peoata REC FrameTYP Length Number Block Physical Iterated Data RecordFrame OFF Iterated SET Data Enumerated Data Offset LENGrHEnumerated ASH OffsetPage Logical Iterated Data Record Object Module Formats Version Same as for the Ridata record REC FixuppThread is a field with the followinq format Structure Target * Target PlacementFixup Locat TIP I Targt Page Overlay Attr Z I Z I Z I Z I Z I S I a TYP Type of END TYP * SUM REG·TYP TYP Length ContentsRegister Initialization Record REC Record REG Register OAT Datum Register ContentsTarget Page TYP Length Addrs Module ~ND RecordStart Frame Offset Number Module COU~T Library Header RecordTYP Length Count Number A6H LiSNAM Library Module Locations Record Libloc 00H * SUM TYP Length Type Pl LI ZI zl ZI ZI ZI zComment Record This field provides the commentary information Linnum SgS6 Object Module Formats Version7C Blkend Lheadr Peoata Pidata Structure Appendix Type RepresentationsScalar Pointer LIn Libhed Libnam Appendix Syntax Diagrams +-1 data 1-+ Component +-1 ImodLheadr -1 sgr +-1 modtail Rheadr -1 sqr +-Imodtail Regint ~-+ CompOnent Data 1--+Tcomponent 1--+ Blkdef Blkend 8e8~ Object Module Formats Version 4.rtJPubdef Extdef Typdef +-- Ridata --+ Content Def88.8~ Obj ect Mod ule Pormats +-- Pidata --+ Appendix Examples of FIXU~S Location Part 1. SELF-RELATIVE REFERE~CES Pppppppppppppppppppppp Llocationl Lllllllllllllllllllllllllllllll FIXUP. Representation InOLlllllllllllll LOC RARGET ~OCArE OperationLlllllllllllll P pp + L P LLLLLLILt.LLLLL Examples JMP SYM + Link Operation Llllllllllllll PPLOC LLLI.LLLLLLLLLL Fixuprepresentati Target I L P Pppppppppppppppppp Llllllllllllll PLlllllllllllll P Pppppppppppppppppp Llllllilllllll Chanqe Or SI8 where dl is app~ied to Location depending onChange Locate Operation Fixup Representation Location Offset Llllllllllllll Llllllllllllll Locate Operation Link OperationPseg Location Offset Frame Frame F~Examples JMP Locate Operation LIe Part 2. Segment Relative References F8VALLlllllllilllll FOVAL-I Llllllllllllll Target I L Llllllllllllll FIXUP. Representation Location Pointer Locate Operation Target Eisym LOeFixup Representation Location Pointer SYM ?=ALllllllllllllllll Ppppppppppppppppppppppppp PS EG P# SYM Lllllllllllllllllll Target MOV AH.HIGHSYM Location Base Pseg Target Fixup Representation Location Base Pseg Target Target SI BPage