Update assembler/usage

2025-06-19 18:00:32 +01:00
parent 2bf055e154
commit ddd93e9e71
1 changed files with 11 additions and 1 deletions
@@ -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