From 1440ebd702eaf7159f3014b638ff2f383176c44d Mon Sep 17 00:00:00 2001
From: GDBWNV <93523315+GDBWNV@users.noreply.github.com>
Date: Thu, 6 Jun 2024 13:34:14 +0100
Subject: [PATCH] single data transfer & load literal

---
 src/twopassassembly.c | 53 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/src/twopassassembly.c b/src/twopassassembly.c
index 97944ab..7643223 100644
--- a/src/twopassassembly.c
+++ b/src/twopassassembly.c
@@ -128,6 +128,53 @@ word dpr(a64inst_instruction cI) {
     return out;
 }
 
+word sts(a64inst_instruction cI) {
+    a64inst_SingleTransferData data = cI.data.SingleTransferData;
+    word out = 0;
+    a64inst_SingleDataTransferData data2 = data.processOpData.singleDataTransferData;
+    // this deals with every bit in the 31-23 range apart from sf and U
+    out += (512+128+64+32)*(2^23);
+    int sf = data.regType;
+    int u = 0;
+    int l = data2.transferType;
+    int offset = 0;
+    int xn = data2.base;
+    int rt = data.target;
+    switch (data2.addressingMode) {
+        // register offset
+        case 2:
+            offset += 2074 + 64*data2.a64inst_addressingModeData.offsetReg;
+            break;
+        // unsigned offset
+        case 3:
+            offset += data2.a64inst_addressingModeData.unsignedOffset;
+            u = 1;
+            break;
+        // pre/post indexed
+        default:
+            offset = 1 + data2.addressingMode*2 + data2.a64inst_addressingModeData.indexedOffset*4;
+            break;
+    }
+    out += sf*(2^30);
+    out += u*(2^22);
+    out += offset*1024;
+    out += xn * 32;
+    out += rt;
+    return out;
+}
+
+word ldl(a64inst_instruction cI) {
+    word out = 3*(2^27);
+    a64inst_SingleTransferData data = cI.data.SingleTransferData;
+    int sf = data.regType;
+    int simm19 = data.processOpData.loadLiteralData.offset;
+    int rt = data.target;
+    out += sf * (2^30);
+    out += simm19*32;
+    out += rt;
+    return out;
+}
+
 void secondPass(a64inst_instruction instrs[], int numInstrs, st* table){
     //TODO:
     // iterate over instructions again, this time replacing labels
@@ -142,6 +189,12 @@ void secondPass(a64inst_instruction instrs[], int numInstrs, st* table){
             case a64inst_DPREGISTER:
                 dpr(cI);
                 break;
+            case a64inst_SINGLETRANSFER:
+                sts(cI);
+                break;
+            case a64inst_LOADLITERAL:
+                ldl(cI);
+                break;
             default:
                 break;
         }