From ba2b9c8a1bb1876b6eb4c9783fde798b19de4418 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Wed, 24 May 2023 08:32:08 -0400
Subject: init

---
 vm/rom.go | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 vm/rom.go

(limited to 'vm/rom.go')

diff --git a/vm/rom.go b/vm/rom.go
new file mode 100644
index 0000000..958e70e
--- /dev/null
+++ b/vm/rom.go
@@ -0,0 +1,19 @@
+package main 
+
+import (
+	 "os"
+	 "fmt"
+)
+
+type Rom []byte
+
+func (r *Rom) Fetch(pc *uint64, n uint64) []byte {
+	if (*pc + n > uint64(len(*r)) - 1) {
+		fmt.Fprintf(os.Stderr, "error: trying to read outside of rom\n")
+		os.Exit(1)
+	}
+	x := make([]byte, n)
+	copy(x, (*r)[*pc:*pc + n])
+	*pc += n
+	return x
+}
-- 
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