From 7e74d1e9a213e786aef6412663cf3bf87260a821 Mon Sep 17 00:00:00 2001
From: Joseph Ferano <joseph@ferano.io>
Date: Sat, 15 Mar 2025 22:28:54 +0700
Subject: [PATCH] Print registers and execute basic mov instructions

---
 execution.odin | 24 ++++++++++++++++++++++++
 sim8086.odin   | 24 ++++++++++++++++--------
 2 files changed, 40 insertions(+), 8 deletions(-)
 create mode 100644 execution.odin

diff --git a/execution.odin b/execution.odin
new file mode 100644
index 0000000..70b38a8
--- /dev/null
+++ b/execution.odin
@@ -0,0 +1,24 @@
+package sim_8086
+
+import "core:os"
+import "core:fmt"
+import "core:math"
+import "core:strings"
+
+execute_instruction :: proc(inst: Instruction) {
+    #partial switch inst.opname {
+        case .MOV:
+        if reg_id,ok := inst.dst.(RegisterId); ok {
+            #partial switch val in inst.src {
+                case Immediate8:
+                registers[reg_id].value.low = (u8)(val)
+                case ImmediateU8:
+                registers[reg_id].value.low = (u8)(val)
+                case Immediate16:
+                registers[reg_id].value.low = (u8)(val)
+                case RegisterId:
+                registers[reg_id].value.full = registers[val].value.full
+            }
+        }
+    }
+}
diff --git a/sim8086.odin b/sim8086.odin
index 49bddfe..a8896f9 100644
--- a/sim8086.odin
+++ b/sim8086.odin
@@ -76,10 +76,6 @@ main :: proc() {
         os.exit(1)
     }
 
-    if false {
-        os.exit(0)
-    }
-     
     // asdf :u16 = 0b00000110_11011101
     // asdf2 :i16 = (i16)(asdf)
     // fmt.printfln("%d", asdf2)
@@ -89,10 +85,22 @@ main :: proc() {
     instructions_list := make([dynamic]Instruction, 0, 512)
 
     decode_data(&instructions_list, data[:], bytes_read)
-    // for inst in instructions_list {
-    //     fmt.println(inst)
-    // }
+
+    for inst in instructions_list {
+        execute_instruction(inst)
+    }
+
     if true {
-        print_instructions_stdout(instructions_list[:])
+        for reg in registers {
+            full := fmt.aprintf("%s (%s): %d ", reg.fullname, reg.bytename, reg.value.full)
+            // hex := fmt.aprintf("%s %*[1]s 0x%x ", full, 25 - len(full), "|", reg.value.full)
+            hex := fmt.aprintf("0x%x ", reg.value.full)
+            fmt.printf("%s %*[1]s %s %*[4]s %08b %08b",
+                       full, 20 - len(full), "|", hex, 10 - len(hex), "|", reg.value.high, reg.value.low)
+            fmt.println()
+        }
+    }
+    if true {
+        // print_instructions_stdout(instructions_list[:])
     }
 }