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Relocator
Relocator

Version management

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At line 3 added 113 lines
{{{
Instructions for:
RELGEN.ACT:== Relocation Generator
& REOCAT.ACT:== Run-time Relocator
These programs were intended to
create a self-relocating object
file from either an ACTION!
compiled program or an Assembled
program. The original object file
must be a single-stage boot with
only one origin except for the
trailing run or init address. The
following instructions detail the
steps to make the target object
file. This file may be appended to
other binary load files and may
have other binary files appended to
it.. The program will load at the
next possible page boundary
(increment of 256) after MEMLO.
Because RELGEN compares two
versions of you object file, you
may want to init all variables to
zero to keep the relocation table
at a minimum. Stray data in the
uninitialized variables may be
interpreted as machine code that
needs relocating.
1) Compile (or Assemble) your code
at a convenient area but not
conflicting with DOS. In ACTION!,
use the following commands to
force the program's origin to a
specified value ($3000 for example):
SET 14=$3000
SET $491=$3000
2) Re-Compile your code at $100
higher than the first. For the
above example, this would be at
$3100.
3) From the ACTION! monitor, RUN the
program RELGEN.ACT. It will prompt
you for the filenames for the two
object code files that you compiled
above. Remember to give the Dn:
prefix to the filenames. The program
will compare the two object files
and note their differences as offsets
into the file. This information is
saved in ACTION! form in a file with
the original name and a ".GEN"
extention. This will be used in the
next step. Also, the program creates
an object file image of the original
but with an origin of zero. This is
done to make the relocation process
easier and this file, with a ".REL"
extention will be used in step 5.
Note: RELGEN.ACT requires four open
DOS files simultaneously. By default,
DOS usually has buffers for only 3.
You must use the command:
SET $709=4
in the ACTION! monitor and type D for
DOS. Rewrite DOS to the disk and
reboot. Now, DOS will allow the four
files to be opened.
4) Now, Read the program RELOC.ACT
into the ACTION! Editor. This is a
"generic" run-time relocator. The
file generated with the RELGEN.ACT
program (with the ".GEN" extention)
must be merged into this program
with the editor Read function.
Position the cursor where instructed
and read in the file. Compile this
code but be sure that it is SET to
compile above the expected end of
YOUR program's target location.
Save this object code to disk and
go to DOS.
5) Using the DOS Copy command,
append the ".REL" file generated in
RELGEN.ACT, to the merged relocator
file saved in step 4. For example:
C
Copy from,to:
TEST.REL,AUTORUN.SYS/A
This assumes that you saved the file
in Step 4 as AUTORUN.SYS.
6) Finally, the appended file can be
loaded from DOS or named AUTORUN.SYS
as above for permanent applications.
If you have question, send E-Mail to:
John DeMar 71066,337 on Compuserve
or leave a message on the ACE-BASE
BBS at (315)451-7747. Good Luck!
}}}
This page (revision-9) was last changed on 03-Feb-2023 15:21 by Carsten Strotmann  Top