Intel XENIX 286 Programmers Guide (86) - Tenox.tc

XENIX Programming Programming Commands
hd r -Displays selected parts of object files.
Syntax
hdr [ -dhprSt ] file ...
Description
hdr displays object file headers, symbol tables, and text or data relocation records in
human-readable formats. It also prints out seek positions for the various segments in
the object file.
a.out, x.out, and x.out segmented formats and archives are understood.
The symbol table format consists of six fields. In a.out formats, the third field is
missing. The first field is the symbol's index or position in the symbol table, printed in
decimal. The index of the first entry is zero. The second field is the type, printed in
hexadecimal. The third field is the s_seg field, printed in hexadecimal. The fourth field
is the symbol's value in hexadecimal. The fifth field is a single character that
represents the symbol's type, as in nm except that C common is not recognized as a
special case of "undefined." The last field is the symbol name.
If long form relocation is present, the format consists of six fields. The first is the
descriptor, printed in hexadecimal. The second is the symbol ID, or index, in decimal.
This field is used for external relocations as an index into the symbol table. It should
reference an undefined symbol table entry. The third field is the position, or offset,
within the current segment at which relocation is to take place; it is printed in
hexadecimal. The fourth field is the name of the segment referenced in the relocation:
text, data, bss, or EXT for external. The fifth field is the size of relocation: byte, word
(2 bytes), or long (4 bytes). The last field, if present, will indicate that the relocation is
relative.
If short form relocation is present, the format consist of three fields. The first field is
the relocation command in hexadecimal. The second field contains the name of the
segment referenced: text or data. The last field indicates the size of relocation: word
or long.
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