feat(L07): add addresses and memory card

tests/reference_model.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+import sys
+
+
+def task01():
+    pc, imm20 = 0x100, 0x12345
+    upper = imm20 << 12
+    assert upper == 0x12345000 and (pc + upper) & 0xFFFFFFFF == 0x12345100
+    print("PASS task01 lui=12345000 auipc=12345100")
+
+
+def task02():
+    ram = [0] * 16
+    ram[0], ram[1] = 0x11223344, 0xAABBCCDD
+    before = list(ram)
+    misaligned = (2 & 3) != 0
+    assert ram[0] == 0x11223344 and ram[1] == 0xAABBCCDD and misaligned and ram == before
+    print("PASS task02 word0=11223344 word1=aabbccdd misaligned=1")
+
+
+def task03():
+    base, immediate = 0x20, 12
+    address = (base + immediate) & 0xFFFFFFFF
+    ram = {address: 0xDEADBEEF}
+    fault = ((base + 2) & 3) != 0
+    assert address == 0x2C and ram[address] == 0xDEADBEEF and fault
+    print("PASS task03 address=0000002c load=deadbeef fault=1")
+
+
+TASKS = {"task01_upper_immediate": task01, "task02_word_ram": task02, "task03_address_memory_path": task03}
+if len(sys.argv) != 2 or sys.argv[1] not in TASKS:
+    raise SystemExit(f"usage: {sys.argv[0]} {'|'.join(TASKS)}")
+TASKS[sys.argv[1]]()