init

5 files changed, 283 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..143b1ca
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+
+/target/
+**/*.rs.bk
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9f9157d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "runes"
+version = "0.1.0"
+authors = ["Determinant <ted.sybil@gmail.com>"]
+
+[dependencies]
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..fa67f49
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1 @@
+mod mos6502;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3544029
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,15 @@
+mod mos6502;
+use mos6502::disasm;
+fn main() {
+    let code = [0xa9, 0x01, 0x8d, 0x00, 0x02, 0xa9, 0x05, 0x8d, 0x01, 0x02, 0xa9, 0x08, 0x8d, 0x02, 0x02 ];
+    let code2 = [0xa9, 0x03, 0x4c, 0x08, 0x06, 0x00, 0x00, 0x00, 0x8d, 0x00, 0x02 ];
+    let dasm = disasm::Disassembler::new(code2.iter());
+    for l in dasm {
+        println!("{}", l);
+    }
+    let a = 0x03;
+    let b = 0x4c;
+    let c = 0x08;
+    let d = 0x06;
+    println!("{}", disasm::parse(code2[0], &[a, b, c, d]));
+}
diff --git a/src/mos6502.rs b/src/mos6502.rs
new file mode 100644
index 0000000..94de974
--- /dev/null
+++ b/src/mos6502.rs
@@ -0,0 +1,257 @@
+macro_rules! make_optable {
+    ($x:ident, $t: ty) => (pub const $x: [$t; 0x100] = [
+    /*  0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf */
+        brk, ora, nil, nil, nil, ora, asl, nil, php, ora, asl, nil, nil, ora, asl, nil,
+        bpl, ora, nil, nil, nil, ora, asl, nil, clc, ora, nil, nil, nil, ora, asl, nil,
+        jsr, and, nil, nil, bit, and, rol, nil, plp, and, rol, nil, bit, and, rol, nil,
+        bmi, and, nil, nil, nil, and, rol, nil, sec, and, nil, nil, nil, and, rol, nil,
+        rti, eor, nil, nil, nil, eor, lsr, nil, pha, eor, lsr, nil, jmp, eor, lsr, nil,
+        bvc, eor, nil, nil, nil, eor, lsr, nil, cli, eor, nil, nil, nil, eor, lsr, nil,
+        rts, adc, nil, nil, nil, adc, ror, nil, pla, adc, ror, nil, jmp, adc, ror, nil,
+        bvs, adc, nil, nil, nil, adc, ror, nil, sei, adc, nil, nil, nil, adc, ror, nil,
+        nil, sta, nil, nil, sty, sta, stx, nil, dey, nil, txa, nil, sty, sta, stx, nil,
+        bcc, sta, nil, nil, sty, sta, stx, nil, tya, sta, txs, nil, nil, sta, nil, nil,
+        ldy, lda, ldx, nil, ldy, lda, ldx, nil, tay, lda, tax, nil, ldy, lda, ldx, nil,
+        bcs, lda, nil, nil, ldy, lda, ldx, nil, clv, lda, tsx, nil, ldy, lda, ldx, nil,
+        cpy, cmp, nil, nil, cpy, cmp, dec, nil, iny, cmp, dex, nil, cpy, cmp, dec, nil,
+        bne, cmp, nil, nil, nil, cmp, dec, nil, cld, cmp, nil, nil, nil, cmp, dec, nil,
+        cpx, sbc, nil, nil, cpx, sbc, inc, nil, inx, sbc, nop, nil, cpx, sbc, inc, nil,
+        beq, sbc, nil, nil, nil, sbc, inc, nil, sed, sbc, nil, nil, nil, sbc, inc, nil
+    ];);
+}
+
+macro_rules! make_addrtable {
+    ($x:ident, $t: ty) => (pub const $x: [$t; 0x100] = [
+       nil, xin, nil, nil, nil, zpg, zpg, nil, nil, imm, acc, nil, nil, abs, abs, nil,
+       rel, iny, nil, nil, nil, zpx, zpx, nil, nil, aby, nil, nil, nil, abx, abx, nil,
+       abs, xin, nil, nil, zpg, zpg, zpg, nil, nil, imm, acc, nil, abs, abs, abs, nil,
+       rel, iny, nil, nil, nil, zpx, zpx, nil, nil, aby, nil, nil, nil, abx, abx, nil,
+       nil, xin, nil, nil, nil, zpg, zpg, nil, nil, imm, acc, nil, abs, abs, abs, nil,
+       rel, iny, nil, nil, nil, zpx, zpx, nil, nil, aby, nil, nil, nil, abx, abx, nil,
+       nil, xin, nil, nil, nil, zpg, zpg, nil, nil, imm, acc, nil, ind, abs, abs, nil,
+       rel, iny, nil, nil, nil, zpx, zpx, nil, nil, aby, nil, nil, nil, abx, abx, nil,
+       nil, xin, nil, nil, zpg, zpg, zpg, nil, nil, nil, nil, nil, abs, abs, abs, nil,
+       rel, iny, nil, nil, zpx, zpx, zpy, nil, nil, aby, nil, nil, nil, abx, nil, nil,
+       imm, xin, imm, nil, zpg, zpg, zpg, nil, nil, imm, nil, nil, abs, abs, abs, nil,
+       rel, iny, nil, nil, zpx, zpx, zpy, nil, nil, aby, nil, nil, abx, abx, aby, nil,
+       imm, xin, nil, nil, zpg, zpg, zpg, nil, nil, imm, nil, nil, abs, abs, abs, nil,
+       rel, iny, nil, nil, nil, zpx, zpx, nil, nil, aby, nil, nil, nil, abx, abx, nil,
+       imm, xin, nil, nil, zpg, zpg, zpg, nil, nil, imm, nil, nil, abs, abs, abs, nil,
+       rel, iny, nil, nil, nil, zpx, zpx, nil, nil, aby, nil, nil, nil, abx, abx, nil
+    ];);
+}
+
+macro_rules! ids2strs {
+    ($($x:ident), *) => {
+        $(#[allow(non_upper_case_globals)]
+            const $x: &str = stringify!($x);)*
+    };
+}
+
+pub mod disasm {
+    mod disops {
+        make_optable!(OPS, &str);
+        ids2strs!(adc, and, asl, bcc, bcs, beq, bit, bmi,
+                  bne, bpl, brk, bvc, bvs, clc, cld, cli,
+                  clv, cmp, cpx, cpy, dec, dex, dey, eor,
+                  inc, inx, iny, jmp, jsr, lda, ldx, ldy,
+                  lsr, nop, ora, pha, php, pla, plp, rol,
+                  ror, rti, rts, sbc, sec, sed, sei, sta,
+                  stx, sty, tax, tay, tsx, txa, txs, tya, nil);
+    }
+    
+    mod disaddr {
+        pub type T<'a, 'b> = &'a mut Iterator<Item=&'b u8>;
+        make_addrtable!(ADDR_MODES, fn (T) -> String);
+        fn acc(code: T) -> String {
+            "a".to_string()
+        }
+        fn imm(code: T) -> String {
+            format!("#${:02x}", code.next().unwrap())
+        }
+        fn zpg(code: T) -> String {
+            format!("${:02x}", code.next().unwrap())
+        }
+        fn zpx(code: T) -> String {
+            format!("${:02x}, x", code.next().unwrap())
+        }
+        fn zpy(code: T) -> String {
+            format!("${:02x}, y", code.next().unwrap())
+        }
+        fn rel(code: T) -> String {
+            let b = *code.next().unwrap();
+            if b >> 7 == 0 {
+                format!("+${:02x}, x", b & 0x7f)
+            } else {
+                format!("-${:02x}, x", b & 0x7f)
+            }
+        }
+        fn abs(code: T) -> String {
+            let low = *code.next().unwrap() as u16;
+            let high = *code.next().unwrap() as u16;
+            format!("${:04x}", (high << 8) | low)
+        }
+        fn abx(code: T) -> String {
+            let low = *code.next().unwrap() as u16;
+            let high = *code.next().unwrap() as u16;
+            format!("${:04x}, x", (high << 8) | low)
+        }
+        fn aby(code: T) -> String {
+            let low = *code.next().unwrap() as u16;
+            let high = *code.next().unwrap() as u16;
+            format!("${:04x}, y", (high << 8) | low)
+        }
+        fn ind(code: T) -> String {
+            let low = *code.next().unwrap() as u16;
+            let high = *code.next().unwrap() as u16;
+            format!("(${:04x})", (high << 8) | low)
+        }
+        fn xin(code: T) -> String {
+            format!("(${:02x}, x)", code.next().unwrap())
+        }
+        fn iny(code: T) -> String {
+            format!("(${:02x}), y", code.next().unwrap())
+        }
+        fn nil(code: T) -> String {
+            "".to_string()
+        }
+    }
+
+    pub struct Disassembler<'a, T> where T: Iterator<Item=&'a u8> {
+        raw_code: T
+    }
+    
+    impl<'a, T> Disassembler<'a, T> where T: Iterator<Item=&'a u8> {
+        pub fn new(raw_code: T) -> Self {
+            Disassembler{raw_code}
+        }
+        fn parse(opcode: u8, code: &mut T) -> String {
+            format!("{} {}", disops::OPS[opcode as usize],
+                             disaddr::ADDR_MODES[opcode as usize](code))
+        }
+    }
+    
+    impl<'a, T> Iterator for Disassembler<'a, T> where T: Iterator<Item=&'a u8> {
+        type Item = String;
+        fn next(&mut self) -> Option<Self::Item> {
+            match self.raw_code.next() {
+                Some(opcode) => Some(Disassembler::parse(*opcode, &mut self.raw_code)),
+                None => None
+            }
+        }
+    }
+    
+    pub fn parse(opcode: u8, code: &[u8]) -> String {
+        Disassembler::parse(opcode, &mut code.iter())
+    }
+}
+
+    mod ops {
+        use mos6502::CPU;
+        make_optable!(OPS, fn (&mut CPU));
+    
+        fn adc(cpu: &mut CPU) {}
+        fn and(cpu: &mut CPU) {}
+        fn asl(cpu: &mut CPU) {}
+        fn bcc(cpu: &mut CPU) {}
+        fn bcs(cpu: &mut CPU) {}
+        fn beq(cpu: &mut CPU) {}
+        fn bit(cpu: &mut CPU) {}
+        fn bmi(cpu: &mut CPU) {}
+        fn bne(cpu: &mut CPU) {}
+        fn bpl(cpu: &mut CPU) {}
+        fn brk(cpu: &mut CPU) {}
+        fn bvc(cpu: &mut CPU) {}
+        fn bvs(cpu: &mut CPU) {}
+        fn clc(cpu: &mut CPU) {}
+        fn cld(cpu: &mut CPU) {}
+        fn cli(cpu: &mut CPU) {}
+        fn clv(cpu: &mut CPU) {}
+        fn cmp(cpu: &mut CPU) {}
+        fn cpx(cpu: &mut CPU) {}
+        fn cpy(cpu: &mut CPU) {}
+        fn dec(cpu: &mut CPU) {}
+        fn dex(cpu: &mut CPU) {}
+        fn dey(cpu: &mut CPU) {}
+        fn eor(cpu: &mut CPU) {}
+        fn inc(cpu: &mut CPU) {}
+        fn inx(cpu: &mut CPU) {}
+        fn iny(cpu: &mut CPU) {}
+        fn jmp(cpu: &mut CPU) {}
+        fn jsr(cpu: &mut CPU) {}
+        fn lda(cpu: &mut CPU) {}
+        fn ldx(cpu: &mut CPU) {}
+        fn ldy(cpu: &mut CPU) {}
+        fn lsr(cpu: &mut CPU) {}
+        fn nop(cpu: &mut CPU) {}
+        fn ora(cpu: &mut CPU) {}
+        fn pha(cpu: &mut CPU) {}
+        fn php(cpu: &mut CPU) {}
+        fn pla(cpu: &mut CPU) {}
+        fn plp(cpu: &mut CPU) {}
+        fn rol(cpu: &mut CPU) {}
+        fn ror(cpu: &mut CPU) {}
+        fn rti(cpu: &mut CPU) {}
+        fn rts(cpu: &mut CPU) {}
+        fn sbc(cpu: &mut CPU) {}
+        fn sec(cpu: &mut CPU) {}
+        fn sed(cpu: &mut CPU) {}
+        fn sei(cpu: &mut CPU) {}
+        fn sta(cpu: &mut CPU) {}
+        fn stx(cpu: &mut CPU) {}
+        fn sty(cpu: &mut CPU) {}
+        fn tax(cpu: &mut CPU) {}
+        fn tay(cpu: &mut CPU) {}
+        fn tsx(cpu: &mut CPU) {}
+        fn txa(cpu: &mut CPU) {}
+        fn txs(cpu: &mut CPU) {}
+        fn tya(cpu: &mut CPU) {}
+        fn nil(cpu: &mut CPU) {}
+    }
+    
+    mod addr {
+        use mos6502::CPU;
+        make_addrtable!(ADDR_MODES, fn (&mut CPU));
+    
+        fn acc(cpu: &mut CPU) {}
+        fn imm(cpu: &mut CPU) {}
+        fn zpg(cpu: &mut CPU) {}
+        fn zpx(cpu: &mut CPU) {}
+        fn zpy(cpu: &mut CPU) {}
+        fn rel(cpu: &mut CPU) {}
+        fn abs(cpu: &mut CPU) {}
+        fn abx(cpu: &mut CPU) {}
+        fn aby(cpu: &mut CPU) {}
+        fn ind(cpu: &mut CPU) {}
+        fn xin(cpu: &mut CPU) {}
+        fn iny(cpu: &mut CPU) {}
+        fn nil(cpu: &mut CPU) {}
+    }
+    
+    pub trait VMem {
+        fn read(addr: u16) -> u8;
+        fn write(addr: u16, data: u8);
+    }
+    
+    pub struct CPU {
+        /* registers */
+        a: u8,
+        x: u8,
+        y: u8,
+        status: u8,
+        pc: u8,
+        sp: u8,
+        /* internal state */
+        ea: u16,    /* effective address */
+    }
+    
+    impl CPU {
+        fn step(&mut self, opcode: u8) {
+            ops::OPS[opcode as usize](self);
+            addr::ADDR_MODES[opcode as usize](self);
+        }
+        fn new() -> Self {
+            CPU{a: 0, x: 0, y: 0, status: 0, pc: 0, sp: 0, ea: 0}
+        }
+    }
+