LOe, Fixup Representation, Location Pointer | Intel 121748-001

8086 Object Module Formats

Version 4.9

2.2 Seqment-Relative Pointer Reference (lonq call) wil.h No Groupinq Where Reference is to an EXTERNAL Symbol

A LLLLLLLLLLLLLL				? ·
L		L				·
L +---.---~-+ L				•
L	LOe	,---~----	.	------------>.	SYM •
L +---..----+L				•		·
L		L		·..		·
LLLLLLLLLLLLLL				·..	.

FIXUP REPRESENTATION:

~--------- ...~.-----

LOCATION: POINTER

PSEG: TARGET (this is the most common choice)

TARGET: EI(SYM)

<- PP

<- PT

LINK OPERATIO~:

There are three ways in which an EXTER~AL seq~ent-relativereference may be resolved:

CASE 1: Ex'rERNAL symbol (SYM) is found (by LINK) to be in the same LSEG as the reference.

CASE 2: EXTERNAL symbol (SYM) is found (by LINK) to be in a d iff ere n t LS EG , B•

CASE 3: EXTERNAL symbol (SYM) is found (by LINK) to he absolute.

114

Image 114

Intel 121748-001 manual LOe, Fixup Representation, Location Pointer, Target Eisym

Contents

Relocatable Object Module Formats IA 500/1181/500 IPI Type Definition Hecord Symbol ContentsSymbol Definition Control Library Dictionary Record Comment Record Appendices Numeric List of Record TypesPage Page Page Page Module Identification Segment Addressing Data Indices Page Page Target Frame Number IndexTarget Target Sicode ,1024Page F11 F21Frame SEGMENT-RELATIVE Fixups Oata Fixup RecordCase +------+ Target Eistruct ,24 Frame Sifoo Target Eiary ,0000H Frame Sifoo Target Eiary ,-2Frame Sifoo Target Eiary Frame Sifoo Target Eistrct ,99 Lheadr Record OrderTheadr RheadrPage 1111 NumberOfficial Abbreviation Number Repeated or Conditional Fields Module Header Record REC Record CHKModule Name TYP Length Lheadr REC Record Overlay OAT Record Count Offset Module Info StaticDynamic Maximum Size Static Storage Page List OF· NAMES. Record Record * Name Length Name OFF LTLOAT LX+LY+G LX+LYMXY Segment Length Segment NAME. Index Class Name IndexOverlay Name Index FFH FEHIndex Object Module Formats Version FDHSegment I I I Z I Z I Z I Z I Z Ibglibgm 80B6 Object Module Formats Leaf SUM SEH USE Descriptor Type Definition RecordREC Record Name Eight CHK TY P Length Eight Leaf Descriptor 129 Object Module FormatsVersion 133 127 Page Public Type CHK TYP Public Names DefinitionREC Record Public Puslic Base Frame Target Frame GI GPublic Offset Type Index Extdef REC Record 8CH ~il·E. Index Local SY~BOLS. Record TYP Length SymbolsLocal Symbols Base REC Record Local Type Local Symbol Name Local S~~BOL OffsetType Index Line Numbers Record Linnum REC TYP LengthLine NU!\1BER Sase 8986 Ob·ject Module Formats Version May Index SUM 7AH Record Block Procedure Type CHK TYP Length BaseBlock Definition Record Block Base Block Name Offset Block Length Procedure Information ReturnAddress Offset TYP Blkend REC Record CHKLength SUM 7CH Offset Index SUM REC RecordTYP Length Information Datum If Frame ~ETHOD=0, the Datum has the format Symbol Name Block Index Data Record Base Relocatable Enumerated Data RecordOAT * CHK TY P Data Record Offset DAT Data Record Base REC RecordIterated Data Record Offset Repeat Block Count Content Repeat Count Iterated Data BlockBlock Count Physical Enumerated Data Record Peoata REC Frame TYP Length NumberFrame NU....,SER SET Data Physical Iterated Data RecordFrame OFF Iterated Block ASH Offset LENGrHEnumerated Enumerated Data OffsetPage Logical Iterated Data Record Object Module Formats Version Same as for the Ridata record Structure FixuppThread is a field with the followinq format REC Locat PlacementFixup Target * Target TIP I Targt Page Overlay Attr Z I Z I Z I Z I Z I S I a TYP * SUM TYP Type of END REC Record REG Register TYP Length ContentsRegister Initialization Record REG·TYP Register Contents TargetOAT Datum Page Module ~ND Record StartTYP Length Addrs Frame Offset Number Library Header Record TYP Length Count NumberModule COU~T LiSNAM A6H Library Module Locations Record Libloc 00H * SUM Pl LI ZI zl ZI ZI ZI z Comment RecordTYP Length Type This field provides the commentary information Lheadr Peoata Pidata SgS6 Object Module Formats Version7C Blkend Linnum Pointer Appendix Type RepresentationsScalar Structure LIn Appendix Syntax Diagrams Libhed Libnam Rheadr -1 sqr +-Imodtail Component +-1 ImodLheadr -1 sgr +-1 modtail +-1 data 1-+ ~-+ Regint Data 1--+ Tcomponent 1--+CompOnent Typdef 8e8~ Object Module Formats Version 4.rtJPubdef Extdef Blkdef Blkend +-- Pidata --+ Content Def88.8~ Obj ect Mod ule Pormats +-- Ridata --+ Appendix Examples of FIXU~S Part 1. SELF-RELATIVE REFERE~CES Pppppppppppppppppppppp Location Lllllllllllllllllllllllllllllll Llocationl LOC InOLlllllllllllll FIXUP. Representation + L P LLLLLLILt.LLLLL ~OCArE OperationLlllllllllllll P pp RARGET Examples JMP SYM + LLLI.LLLLLLLLLL Fixuprepresentati Llllllllllllll PPLOC Link Operation Llllllilllllll Pppppppppppppppppp Llllllllllllll PLlllllllllllll P Pppppppppppppppppp Target I L P Or SI8 where dl is app~ied to Location depending on ChangeChanqe Locate Operation Llllllllllllll Fixup Representation Location Offset Link Operation PsegLlllllllllllll Locate Operation JMP Frame F~Examples Location Offset Frame LIe Locate Operation Llllllllllllll F8VALLlllllllilllll FOVAL-I Part 2. Segment Relative References Llllllllllllll FIXUP. Representation Location Pointer Target I L Locate Operation Location Pointer LOeFixup Representation Target Eisym Ppppppppppppppppppppppppp ?=ALllllllllllllllll SYM PS EG P# SYM Target Lllllllllllllllllll MOV AH.HIGHSYM Fixup Representation Location Base Pseg Target Target SI B Location Base Pseg TargetPage