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From: WALDI@DHDIHEP1.BITNET
Newsgroups: comp.sys.atari.st
Subject: relocatable PRG
Message-ID: <8710211026.AA00597@ucbvax.Berkeley.EDU>
Date: Wed, 21-Oct-87 06:26:46 EDT
Article-I.D.: ucbvax.8710211026.AA00597
Posted: Wed Oct 21 06:26:46 1987
Date-Received: Fri, 23-Oct-87 03:47:11 EDT
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Date: 21 October 1987, 11:13:09 SET
From: Roland Waldi              phone (6221) 564334  WALDI    at DHDIHEP1
      Inst. fuer Hochenergiephysik
      D-6900 Heidelberg
To:   INFO-ATA at SCORE.ST

Someone asked for the format of relocatable program files.
Here it is to the best of my knowlegde, however I never checked
if this is correct:

HEADER (28bytes)
              +--------+--------+
           0  |     $601A       |
              +--------+--------+--------+--------+
           2  |  Number of bytes in text segment  |
              +--------+--------+--------+--------+
           6  |  Number of bytes in data segment  |
              +--------+--------+--------+--------+
          10  |      Number of bytes in bss       |
              +--------+--------+--------+--------+
          14  |  Number of bytes in symbol table  |
              +--------+--------+--------+--------+
          18  |        Reserved, must be 0        |
              +--------+--------+--------+--------+
          22  |        Reserved, must be 0        |
              +--------+--------+--------+--------+
          26  |     Reserved    |
              +--------+--------+
TEXT (program) and DATA segments
              +--------....-----+
              |                 |
              +--------....-----+
SYMBOL TABLE (optional)
              +--------+--------+--------+----...----+
 entry_1  +0  | Symbol Name                          |
              +--------+--------+-------------...----+
          +8  |       Type *)   |
              +--------+--------+--------+--------+
         +10  | Value                             |
              +--------+--------+--------+--------+
 entry_2 +14  ...
              +--------+--------+--------+--------+
 ...
 *) Symbol Types:
            $0100    bss-based relocatable
            $0200    text-based relocatable
            $0400    data-based relocatable
            $0800    external reference (value = size of common region)
            $1000    equated register (value = register number)
            $2000    global
            $4000    equated
            $8000    defined
RELOCATION TABLE (if relocatable)
              +--------+--------+--------+--------+
          +0  |  Offset of 1st longword to        |
              |  relocate (relative to start of   |
              |  TEXT segment)                    |
              +--------+--------+--------+--------+
          +4  | Offset |
              +--------+
          +5  | Offset |
              +--------+
              . ...    .
              +--------+
              | 0-byte |
              +--------+
  Offset counts the byte distance
  to the next longword to relocate. If there are
  more than 254 bytes, an Offset-value of 1 indicates that 254 should
  be added to the offset counter.