62 lines
1.8 KiB
Rust
62 lines
1.8 KiB
Rust
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// icodes
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pub struct Icode {}
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impl Icode {
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// Official names
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pub const BRK: u8 = 0x00u8;
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pub const LIT: u8 = 0x1 << 7; // AKA keep Yes really. Per spec;
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pub const INC: u8 = 0x01;
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pub const POP: u8 = 0x02;
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pub const NIP: u8 = 0x03;
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pub const SWP: u8 = 0x04;
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pub const ROT: u8 = 0x05;
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pub const DUP: u8 = 0x06;
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pub const OVR: u8 = 0x07;
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pub const EQL: u8 = 0x08;
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pub const NEQ: u8 = 0x09;
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pub const GTH: u8 = 0x0a;
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pub const LTH: u8 = 0x0b;
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pub const JMP: u8 = 0x0c;
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pub const JCN: u8 = 0x0d;
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pub const JSR: u8 = 0x0e;
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pub const STH: u8 = 0x0f;
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pub const LDZ: u8 = 0x10;
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pub const STZ: u8 = 0x11;
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pub const LDR: u8 = 0x12;
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pub const STR: u8 = 0x13;
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pub const LDA: u8 = 0x14;
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pub const STA: u8 = 0x15;
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pub const DEI: u8 = 0x16;
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pub const DEO: u8 = 0x17;
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pub const ADD: u8 = 0x18;
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pub const SUB: u8 = 0x19;
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pub const MUL: u8 = 0x1a;
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pub const DIV: u8 = 0x1b;
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pub const AND: u8 = 0x1c;
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pub const ORA: u8 = 0x1d;
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pub const EOR: u8 = 0x1e;
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pub const SFT: u8 = 0x1f;
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// Opcode flags
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pub const SHORT: u8 = 0x1 << 5;
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pub const RETURN: u8 = 0x1 << 6;
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pub const KEEP: u8 = 0x1 << 7;
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// Hacking around the weird official names for some things
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pub const XOR: u8 = Icode::ORA;
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pub const EQ: u8 = Icode::EQL;
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pub const NE: u8 = Icode::NEQ;
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pub const GT: u8 = Icode::GTH;
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pub const LT: u8 = Icode::LTH;
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pub const OR: u8 = Icode::ORA;
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pub const NOP: u8 = Icode::POP | Icode::KEEP;
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pub const fn parse(opcode: u8) -> (u8, u8, u8, u8) {
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let kflag: u8 = (opcode >> 7) & 0x1;
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let rflag: u8 = (opcode >> 6) & 0x1;
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let sflag: u8 = (opcode >> 5) & 0x1;
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let icode: u8 = opcode & 0x1F;
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(kflag, rflag, sflag, icode)
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}
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}
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