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Update assembler/usage

zxq5
2025-06-19 18:00:32 +01:00
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assembler%2Fusage.md
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@@ -18,7 +18,17 @@ This document provides a comprehensive reference for the DSA (Damn Simple Archit
- general purpose: `rg0-rgf`
- be careful when using `rgf` for storing data as some pseduo-instructions may implicitly overwrite this register.
- special registers:
- ``
- `acc` - the accumulator. useful for storing the results of calculations, especially in iterators where a temporary register may be needed.
- `spr` - stack pointer. once you've written the stack location to this, you likely won't need to worry about it, as push/pop pseduo-instructions abstract over this.
- `bpr` - base pointer for the stack.
- `ret` - return address register. if you're writing a function, it is good practice to store return addresses here.
start functions with `pop ret` and end them with `jmp 4, ret` for a seamless call/return flow, assuming the function was called like `push pcx; jmp function`
- `idr` - **(privilleged)** holds the address of interrupt descriptor table
- `mmr` - **(privilleged)** holds the address of hardware memory map table
- `zero` - **(read only)** literally just zero.
- `pcx` - **(read only)** program counter, useful for function return addresses.
- `noreg` **(placeholder)** this indicates the absence of a register argument. has the same effect as leaving an operand blank.
## Hardware Instructions
### Data Movement Instructions