From 497cd7ce3b5c09b9fce9f624a7015e65b18c2953 Mon Sep 17 00:00:00 2001
From: sBubshait <s.bobshit@gmail.com>
Date: Thu, 30 May 2024 15:21:24 +0100
Subject: [PATCH] Add instruction type classification to decode, w/ T

---
 src/decode.c | 19 +++++++++++++++++++
 src/decode.h |  7 +++++++
 2 files changed, 26 insertions(+)

diff --git a/src/decode.c b/src/decode.c
index a1f7819..77c47b7 100644
--- a/src/decode.c
+++ b/src/decode.c
@@ -21,4 +21,23 @@ a64inst_instruction *decode(word wrd) {
         fprintf(stderr, "Ran out of memory while attempting to decode an instruction!\n");
         exit(1);
     }
+
+    word DPImmFlag = getBits(wrd, DATA_PROCESSING_DPIMM_LSB, DATA_PROCESSING_DPIMM_MSB);
+    if (wrd == HALT_WORD) {
+        inst->type = a64inst_Halt;
+        
+    } else if (DPImmFlag == 0) {
+        inst->type = a64inst_DPImmediate;
+
+    }else if (DPImmFlag == 1) {
+        inst->type = a64inst_Branch;
+
+    } else if (getBits(wrd, DATA_PROCESSING_DPReg_LSB, DATA_PROCESSING_DPReg_MSB) == 1) {
+        inst->type = a64inst_DPRegister;
+
+    } else {
+        // Load and Store, or unknown
+    }
+    
+
 }
diff --git a/src/decode.h b/src/decode.h
index a76bcdd..c24c235 100644
--- a/src/decode.h
+++ b/src/decode.h
@@ -2,5 +2,12 @@
 #include "a64instruction.h"
 
 #define BYTE_BITS 8
+#define HALT_WORD 0x8a000000
+
+#define DATA_PROCESSING_DPIMM_LSB 26
+#define DATA_PROCESSING_DPIMM_MSB 29
+
+#define DATA_PROCESSING_DPReg_LSB 25
+#define DATA_PROCESSING_DPReg_MSB 26
 
 a64inst_instruction *decode(word w);
\ No newline at end of file