mysimulation/library/tools/hitutils/Design.txt
2024-05-06 19:40:19 +02:00

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1. Dumping
A HIT file is dumped by running this command:
$ hitdump -o example.txt example.hit
This will disassemble example.hit into example.txt using MakeTrax syntax.
* Instructions, arguments, registers, and globals are rewritten using the mnemonics in
example.hsm.
* The disassembly is split into BINARY[] sections and logical addresses are defined names
using the data provided by example.hsm, example.hot, example.evt, and the HIT symbol table.
All user-created constants in example.hsm that begin with "tkd_" are interpreted by
hitutils as track data.
2. Reassembling
A source file is assembled into an intermediate object by running this command:
$ hitasm -o example.o example.txt
This will assemble example.txt into example.o according to MakeTrax syntax.
* Instructions, arguments, and registers are interpreted using the mnemonics in example.hsm.
* The logical addresses defined in example.hsm are ignored.
3. Relinking into the game
Object files are relinked into the game by running this command:
$ hitld -o example.hit example1.o example2.o ...
This will link example1.o, example2.o, and so on into example.hit and reconstruct the
relocation tables in example.hot and example.hsm.
To clarify, the user cannot change the events signaled by objects without changing the
SimAntics of each of those objects. The HIT subroutines invoked by those events, however, can
be changed or swapped out quite easily.
Appendix A. Address labeling strategies
In TSO, the HIT symbol table lists the logical address of each exported function, along with
the Track File ID associated with it.
In TSO, the EVT file lists the name of each exported function, along with the Track File ID
associated with it.
* The HIT file can be used to locate each exported function for placement in BINARY[] sections.
* In the case of tsov2.hit, the HIT and EVT files can be used together to name these exported
functions, seeing that the HSM file is not provided.
The HOT file lists all addresses that were labelled, along with the Track File ID associated
with it, in the TrackData section. Because the HIT symbol table is not included in The Sims 1,
the TrackData section can be used instead.
The HSM file lists the name of each labelled address, along with its logical address in the
HIT file. (This is done with a Ctrl+F for "tkd_").