42 lines
1007 B
Rust
42 lines
1007 B
Rust
use std::convert::{From, Into};
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struct Address(usize);
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impl From<usize> for Address {
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fn from(v: usize) -> Self {
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if v > 0xFFFF {
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panic!("Address is bigger than 0x10000 (Got 0x{:04X})", v);
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}
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Self(v)
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}
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}
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impl From<u16> for Address {
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fn from(v: u16) -> Self {
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Self(v as usize)
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}
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}
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pub fn get_size(addr_mode: AddressingMode) -> usize {
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OP_SIZES[addr_mode as usize]
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}
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//A,abs,absX,absY,imm,impl,ind,indX,indY,rel,zpg,zpgX,zpgY
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//1, 3, 3, 3, 2, 1, 3, 2, 2, 2, 2, 2, 2
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pub static OP_SIZES: [usize; 13] = [1, 3, 3, 3, 2, 1, 3, 2, 2, 2, 2, 2, 2];
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#[derive(Debug, Copy, Clone, PartialEq)]
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pub enum AddressingMode {
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A = 0, // LSR A
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ABS, // LDA $1234
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ABSX, // STA $3000,X
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ABSY, // AND $4000,Y
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IMM, // LDA #$10
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IMPL, // CLC
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IND, // JMP ($FFFC)
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INDX, // LDA ($40,X)
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INDY, // LDA ($40),Y
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REL, // LABEL // +4
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ZPG, // LDA $10
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ZPGX, // LDA $10,X
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ZPGY, // LDA $10,Y
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}
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