Add encodings for ORI and SW

js/encoders.js

@@ -20,9 +20,25 @@ const encoders = {
   'LUI': (rt, immediate) => {
     let encoded = '001111'
     encoded = encoded + '0'.repeat(5)
-    encoded = encoded + utils.dec2binu(getReg(rt))
+    encoded = encoded + utils.dec2binu(getReg(rt), 5)
     encoded = encoded + utils.hex2bin(immediate, 16)
     return '0x' + utils.bin2hex(encoded, 8)
+  },
+  'ORI': (rt, rs, immediate) => {
+    let encoded = '001101'
+    encoded = encoded + utils.dec2binu(getReg(rs), 5)
+    encoded = encoded + utils.dec2binu(getReg(rt), 5)
+    encoded = encoded + utils.hex2bin(immediate, 16)
+    return '0x' + utils.bin2hex(encoded, 8)
+  },
+  'SW': (rt, offsetBase) => {
+    const [offset, base] = utils.splitOffsetBase(offsetBase)
+    let encoded = '101011'
+    encoded = encoded + utils.dec2binu(getReg(base), 5)
+    encoded = encoded + utils.dec2binu(getReg(rt), 5)
+    encoded = encoded + utils.int16_2bin(offset, 16)
+    console.log(encoded)
+    return '0x' + utils.bin2hex(encoded, 8)
   }
 }
 

js/utils.js

@@ -10,6 +10,15 @@ const dec2binu = (dec, length) => {
   }
 }
 
+const int16_2bin = (int16) => {
+  const signed32 = (int16 >>> 0).toString(2)
+  if (signed32.length > 16) {
+    return signed32.slice(16)
+  } else {
+    return '0'.repeat(16 - signed32.length).concat(signed32)
+  }
+}
+
 const hex2bin = (hex, length) => {
   if (hex.startsWith('0x')) {
     return dec2binu(parseInt(hex.slice(2), 16), length)
@@ -27,9 +36,13 @@ const bin2hex = (bin, length) => {
   }
 }
 
+const splitOffsetBase = (offsetBase) => offsetBase.trim().slice(0, -1).split('(').map(s => s.trim())
+
 module.exports = {
   'error': error,
   'dec2binu': dec2binu,
   'hex2bin': hex2bin,
-  'bin2hex': bin2hex
+  'bin2hex': bin2hex,
+  'int16_2bin': int16_2bin,
+  'splitOffsetBase': splitOffsetBase
 }