From 914a3f3cdc4f453d6993a80caa4411e894ad9c3d Mon Sep 17 00:00:00 2001
From: Artemis Rosman <artemis.rosman@gmail.com>
Date: Fri, 10 May 2024 19:33:23 +1000
Subject: [PATCH] Add OPs table

---
 src/ops.rs    | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/state.rs  |  2 +-
 src/symbol.rs | 10 ++++++++
 3 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 src/ops.rs
 create mode 100644 src/symbol.rs

diff --git a/src/ops.rs b/src/ops.rs
new file mode 100644
index 0000000..7b42cc4
--- /dev/null
+++ b/src/ops.rs
@@ -0,0 +1,69 @@
+use crate::state::Flag;
+use crate::symbol::Register;
+
+enum Opcodes {
+    // Add SR1 (source register 1) with SR2 and store in DR (destination register)
+    ADD {
+        dest_r: Register,
+        src_r_1: Register,
+        src_r_2: Choice,
+    },
+    // Bitwise AND SR1 with SR2 and store in DR
+    AND {
+        dest_r: Register,
+        src_r_1: Register,
+        src_r_2: Choice,
+    },
+    // Branch based on flag by adding offset to PC
+    BR {
+        cc: Flag,
+        pc_offset9: u16,
+    },
+    // Set PC to BaseR
+    JMP {
+        base_r: Register,
+    },
+    JSR {
+        pc_offset11: u16,
+    },
+    JSRR {
+        base_r: Register,
+    },
+    LD {
+        dest_r: Register,
+        pc_offset9: u16,
+    },
+    LDI {
+        dest_r: Register,
+        pc_offset9: u16,
+    },
+    LDR {
+        dest_r: Register,
+        base_r: Register,
+        pc_offset6: u16,
+    },
+    LEA {
+        dest_r: Register,
+        pc_offset9: u16,
+    },
+    NOT {
+        dest_r: Register,
+        src_r: Register,
+    },
+    RET,
+    RTI,
+    ST {
+        src_r: Register,
+        pc_offset9: u16,
+    },
+    STI {
+        src_r: Register,
+        pc_offset9: u16,
+    },
+}
+
+// ADD and AND commands support immediate value
+enum Choice {
+    Reg(Register),
+    Imm5(u8),
+}
diff --git a/src/state.rs b/src/state.rs
index c6b4d95..fa974b5 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -20,7 +20,7 @@ pub struct State {
 }
 
 // Set using result from previous instruction
-enum Flag {
+pub enum Flag {
     // Negative
     N,
     // Zero
diff --git a/src/symbol.rs b/src/symbol.rs
new file mode 100644
index 0000000..8754caa
--- /dev/null
+++ b/src/symbol.rs
@@ -0,0 +1,10 @@
+pub enum Register {
+    R0 = 0,
+    R1,
+    R2,
+    R3,
+    R4,
+    R5,
+    R6,
+    R7,
+}