Reloc Offsets, Map16++, and more...

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Main - SMW Hacking - Reloc Offsets, Map16++, and more...

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boingboingsplat

Posted on 11-05-07 03:13 AM

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From: Michicola

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Alright, I'm making myself a block, and there are a couple of things that I need more info about/need to know how to do.

First of all, what are the reloc offsets for in Block Tool? They seem to have a lot to do with Map16++, but I have seen them used in other blocks too. How do you determine what to use for them?

Alright, how do you make a block change into the next block of map16? I could never figure it out, and it is pretty vital to my block. It'd be nice if this was explained in ASM as opposed to machine code.

And lastly, how do you make a block spawn a "glitter trial" such as what appears after you collect a coin? This would be a nice touch to what I'm creating, but not entirely necessary.

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blackhole89

Posted on 11-05-07 03:16 AM

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Since: 02-19-07
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If I remember correctly (It's been years

), the reloc offsets are just the offsets in the block binary at which absolute addresses need to be adapted to where blocktool actually winds up placing the block in the ROM.

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boingboingsplat

Posted on 11-06-07 04:01 AM

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Since: 07-23-07
From: Michicola

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	Would someone please explain reloc offsets more in-depth? I have the code for the Map16++ and Glitter trail from the source of Mikeyk's coins, but I'm starting to think that its the reloc offsets that keep them from functioning. ____________________

Smallhacker

Posted on 11-06-07 08:59 AM

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The 65c816 opcodes JSR, JSL, JMP and JML requires the absolute address of the target.

However, if the target is inside the block code, there is no way to know in advance where the code will be inserted. Therefore, you make the "absolute addresses" relative to the start of the block, then add the address of the address to the reloc list. When BlockTool inserts the block, it will find a place to insert the data to, check the reloc offsets, add the start address of the block code to the relative addresses and insert.

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boingboingsplat

Posted on 11-06-07 09:16 PM

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Since: 07-23-07
From: Michicola

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	Thanks Smallhacker. I think I get it now. If I get any more problems (Hopefully I won't) I'll ask about them here. ____________________

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