Intel iAPX 86 User Manual page 104

iAPX 86,88 Family Utilities
iAPX 86,88 Absolute Object File Formats
Repeated Fields
Some portions of a Record Format contain a field or series of fields that may occur
an indefinite number of times (zero or more). Such fields are indicated by the
"repeated" or "rpt" brackets below the boxes.
Similarly, some portions of the Record Format are present only if some given condi-
tion obtains; these fields are indicated by similar "conditional" brackets below the
boxes.
Chk Sum
The last field in each record is a check sum, which contains the two's complement of
the sum (modulo 256) of all other bytes in the record. Therefore, the sum (modulo
256) of all bytes in the record equals O.
Bit Fields
Descriptions of contents of fields will sometimes get down to the bit level. Boxes
with vertical lines drawn through them represent bytes or words; the vertical lines in-
dicate bit boundaries; thus this byte has three bit-fields of three, one, and
four bits:
Ignored Rec()rds
RECORD IGNORE
TYP LENGTH THIS
PART
CHK
SUM
[
- R E C - . . . . - - - - - - •••
----~----------~~,--
...
----~--------~
All record types that may be in an object module that provide information not perti-
nent to an absolute loader must be ignored., They may all be treated as if they have
the above format. Records in this category have REC TYP in the set 72H, 74H,
7AH, 7CH, 7EH, 88H, 8CH, 8EH, 90H, 92H, 94H, 96H, 98H, 9AH, 9CH.
T-Module Header Record (THEAIJR)
[
' - R E C - . - - - - · - ••• - . - - - - - - ,
RECORD T CHK
TYP LENGTH MODULE SUM
MH NAME
_ _ _ _ _ _
~
_ _ _ _ _ _ _ _ _ _ _ L _ _ _ _ _ • • •
----~--------~
Every module output from a translator must have aT-MODULE HEADER
RECORD. Its purpose is to provide the identity of the original defining module for
all debug information encountered in the module up to the following T-MODULE
HEADER RECORD or MODULE END RECORD.
This record can ,also serve as the header for a module; i.e., it can be the first record
and will be for modules that are output from translators.
A-5