mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-25 17:58:07 +11:00
440ea43a88
Initially, I used the same letters as those used in the z80 ref docs, but it makes the different assemblers harder to use than they should. Having consistent "argtype" rules across assemblers should help.
17 lines
735 B
Plaintext
17 lines
735 B
Plaintext
BIN( is the addr at which the compiled binary will live. It is
|
|
often 0.
|
|
|
|
ORG is H@ offset at which we begin spitting binary. Used to
|
|
compute PC. To have a proper PC, call "H@ ORG !" at the
|
|
beginning of your assembly process. PC is H@ - ORG + BIN(.
|
|
|
|
Labels are a convenient way of managing relative jump
|
|
calculations. Backward labels are easy. It is only a matter or
|
|
recording "HERE" and do subtractions. Forward labels record the
|
|
place where we should write the offset, and then when we get to
|
|
that point later on, the label records the offset there.
|
|
|
|
To avoid using dict memory in compilation targets, we
|
|
pre-declare label variables here, which means we have a limited
|
|
number of it. For now, 4 ought to be enough. (cont.)
|