HDR(C) XENIX System V HDR(C)
Name
hdr - Display selected parts of an object file.
Syntax
hdr [ -dhprsSt ] file ...
Description
hdr displays executable binary 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 executable binary 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 which represents the symbol's type as
in nm(C), except 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. The last field will indicate, if present,
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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HDR(C) XENIX System V HDR(C)
Options and their meanings are:
-d Causes the data relocation records to be printed out.
-h Causes the executable binary file header and extended
header to be printed out. Each field in the header or
extended header is labeled. This is the default
option.
-p Causes seek positions to be printed out as defined by
macros in the include file, <a.out.h>.
-r Causes both text and data relocation to be printed.
-s Prints the symbol table.
-S Prints the file segment table with a header. (Only
applicable to x.out segmented executable files.)
-t Causes the text relocation records to be printed out.
See Also
a.out(F), nm(C)
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