All opcodes except the syscalls

src/vm.cpp

@@ -219,6 +219,35 @@ void eval(uint8_t* memory, size_t memory_size) {
       }
       break;
     }
+    case 0x6F: { // JAL
+      int32_t offset = ((instr & 0x80000000) ? 0xFFF00000 : 0) | // Sign-extension for imm[20]
+        ((instr >> 21) & 0x3FF) << 1 |           // imm[10:1]
+        ((instr >> 20) & 0x1) << 11 |            // imm[11]
+        ((instr & 0xFF000));                     // imm[19:12]
+      offset <<= 1; // Multiply by 2 (JAL offsets are word-aligned)
+
+      registers[rd] = pc; // Save return address
+      pc += offset - 4;
+      break;
+    }
+    case 0x67: { // JALR
+      int32_t offset = (instr >> 20); // Sign-extended 12-bit immediate
+      uint32_t target = (registers[rs1] + offset) & ~1; // Target address (LSB cleared)
+
+      registers[rd] = pc; // Save return address
+      pc = target - 4;
+      break;
+    }
+    case 0x37: { // LUI
+      uint32_t imm = (instr >> 12) & 0xFFFFF; // Extract 20-bit immediate
+      registers[rd] = imm << 12;  // Shift the immediate to the upper 20 bits of the register
+      break;
+    }
+    case 0x17: { // AUIPC
+      uint32_t imm = (instr >> 12) & 0xFFFFF; // Extract 20-bit immediate
+      registers[rd] = pc + (imm << 12);  // Add the immediate (shifted left) to the current PC
+      break;
+    }
     default:
       throw std::runtime_error("Unknown opcode");
     }