move subroutine instructions to this file

Author: kartikchauhan

04-call-subroutine.js

@@ -0,0 +1,82 @@
+const subRoutineAddress = 0x3000;
+let i = 0;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x33;
+writableBytes[i++] = 0x33;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x22;
+writableBytes[i++] = 0x22;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x11;
+writableBytes[i++] = 0x11;
+
+writableBytes[i++] = MOV_LIT_REG;
+writableBytes[i++] = 0x12;
+writableBytes[i++] = 0x34;
+writableBytes[i++] = R1;
+
+writableBytes[i++] = MOV_LIT_REG;
+writableBytes[i++] = 0x56;
+writableBytes[i++] = 0x78;
+writableBytes[i++] = R4;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x00;
+writableBytes[i++] = 0x00;
+
+// Initiates Abstract Stack
+writableBytes[i++] = CAL_LIT;
+writableBytes[i++] = (subRoutineAddress & 0xff00) >> 8;
+writableBytes[i++] = (subRoutineAddress & 0x00ff) >> 8;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x44;
+writableBytes[i++] = 0x44;
+
+// Subroutine
+i = subRoutineAddress;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x01;
+writableBytes[i++] = 0x02;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x03;
+writableBytes[i++] = 0x04;
+
+writableBytes[i++] = PSH_LIT;
+writableBytes[i++] = 0x05;
+writableBytes[i++] = 0x06;
+
+writableBytes[i++] = MOV_LIT_REG;
+writableBytes[i++] = 0x07;
+writableBytes[i++] = 0x08;
+writableBytes[i++] = R1;
+
+writableBytes[i++] = MOV_LIT_REG;
+writableBytes[i++] = 0x09;
+writableBytes[i++] = 0x0A;
+writableBytes[i++] = R4;
+
+writableBytes[i++] = RET;
+
+cpu.debug();
+cpu.viewMemoryAt(cpu.getRegister('ip'));
+cpu.viewMemoryAt(0xffff - 1 - 42, 44); // View memory at next 44 bytes
+console.log("\n\n");
+
+const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout
+});
+
+rl.on('line', () => {
+    cpu.step();
+    cpu.debug();
+    cpu.viewMemoryAt(cpu.getRegister('ip'));
+    cpu.viewMemoryAt(0xffff - 1 - 42, 44);
+    console.log("\n\n");
+});