Update instructions, fix diff settings and add asm-differ

...to simplify setup a bit

tools/diff.py

@@ -18,7 +18,7 @@ for info in utils.get_functions():
         if not info.decomp_name:
             utils.fail(f"{args.function} has not been decompiled")
 
-        subprocess.call(["asm-differ", "-e", info.decomp_name, "0x%016x" %
+        subprocess.call(["tools/asm-differ/diff.py", "-e", info.decomp_name, "0x%016x" %
                          info.addr, "0x%016x" % addr_end] + unknown)
 
         if info.status == utils.FunctionStatus.NonMatching:

tools/diff_settings.py

@@ -3,6 +3,6 @@
 def apply(config, args):
     config['arch'] = 'aarch64'
     config['baseimg'] = 'data/main.elf'
-    config['myimg'] = 'build/uking.elf'
+    config['myimg'] = 'build/uking'
     config['source_directories'] = ['src']
     config['objdump_executable'] = 'aarch64-linux-gnu-objdump'