From 7f796dd9893cad90d8b606eca044a3ca94d3bac6 Mon Sep 17 00:00:00 2001
From: Ry <ryanst755@gmail.com>
Date: Sun, 17 Apr 2022 13:29:17 -0700
Subject: [PATCH] fox32: Dump RAM if bad opcode

---
 src/cpu.rs    | 4 +++-
 src/memory.rs | 6 ++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/cpu.rs b/src/cpu.rs
index 9a1f57c..942deec 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -268,6 +268,8 @@ impl Cpu {
             println!("{:#010X}: bad opcode {:#06X}", self.instruction_pointer, opcode);
             println!("size instr  . cond dest src");
             println!("{:02b}   {:06b} {:01b} {:03b}  {:02b}   {:02b}", size, instruction, empty, condition, destination, source);
+            println!("dumping RAM");
+            self.bus.memory.dump();
             panic!("bad opcode");
         }
     }
@@ -2852,4 +2854,4 @@ impl Instruction {
             _ => None,
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/memory.rs b/src/memory.rs
index 80f624c..23ccd3d 100644
--- a/src/memory.rs
+++ b/src/memory.rs
@@ -5,6 +5,7 @@ use crate::error;
 use std::cell::UnsafeCell;
 use std::sync::Arc;
 use std::io::Write;
+use std::fs::File;
 
 pub const MEMORY_RAM_SIZE: usize = 0x04000000; // 64 MiB
 pub const MEMORY_ROM_SIZE: usize = 0x00080000; // 512 KiB
@@ -54,6 +55,11 @@ impl Memory {
     pub fn ram(&self) -> &mut MemoryRam { &mut self.inner().ram }
     pub fn rom(&self) -> &mut MemoryRom { &mut self.inner().rom }
 
+    pub fn dump(&self) {
+        let mut file = File::create("memory.dump").expect("failed to open memory dump file");
+        file.write_all(self.ram()).expect("failed to write memory dump file");
+    }
+
     pub fn read_8(&self, address: u32) -> u8 {
         let address = address as usize;