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Is there any more detailed documentation available on SymbOS's relocation t= able than what I found in SymbOS-Applications.txt?
The fourth part contains the relocator table. The relocator table is a lis=
t of
pointer (words), which points to the addresses, where a reference needs to=
be
modified, so that the application code can be relocated. The relocator tab=
le
will be loaded only temporary and removed after the relocation process.
Is the table just a list of 16-bit offsets into the binary where a 16-bit a= ddress needs adjustment?
If so, this isn't adequate for z80 programs. Here's one example that split=
s an address into its low and high byte portions:
0109 DD 7E FC [19] 343 ld a,-4 (ix)
010C C6r00 [ 7] 344 add a, #<(_dos_filenum) ;; LSB
010E DD 77 FC [19] 345 ld -4 (ix),a
0111 DD 7E FD [19] 346 ld a,-3 (ix)
0114 CEs00 [ 7] 347 adc a, #>(_dos_filenum) ;; MSB
0116 DD 77 FD [19] 348 ld -3 (ix),a
To properly relocate this code, you'd have to patch single bytes correspond= ing to the _dos_filename high and low byte portions.
If SymbOS can't relocate this sort of code, would it be possible for a prog= ram to supply its own relocator that is discarded by SymbOS after it's run?
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<div>Is there any more detailed documentation available on SymbOS’s relocation table than what I found in SymbOS-Applications.txt?</div>
<div><br>
</div>
<div>>The fourth part contains the relocator table. The relocator table is a list of<br>
>pointer (words), which points to the addresses, where a reference needs to be<br>
>modified, so that the application code can be relocated. The relocator table<br>
>will be loaded only temporary and removed after the relocation process.</div>
<div><br>
</div>
<div>Is the table just a list of 16-bit offsets into the binary where a 16-bit address needs adjustment?</div>
<div><br>
</div>
<div>If so, this isn't adequate for z80 programs. Here’s one example that splits an address into its low and high byte portions:</div>
<div><br>
</div>
<div>
<pre>0109 DD 7E FC [19] 343 ld a,-4 (ix)
010C C6r00 [ 7] 344 add a, #<(_dos_filenum) ;; LSB 010E DD 77 FC [19] 345 ld -4 (ix),a
0111 DD 7E FD [19] 346 ld a,-3 (ix)
0114 CEs00 [ 7] 347 adc a, #>(_dos_filenum) ;; MSB 0116 DD 77 FD [19] 348 ld -3 (ix),a</pre>
</div>
<div><br>
</div>
<div>To properly relocate this code, you’d have to patch single bytes corresponding to the _dos_filename high and low byte portions.</div>
<div><br>
</div>
<div>If SymbOS can’t relocate this sort of code, would it be possible for a program to supply its own relocator that is discarded by SymbOS after it’s run?</div>
<div><br>
</div>
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