add get_direct_addressing_ModRM and test_*, fix a couple bugs/typos, add 'reg value' as register metadata

twasm/asm/tests.asm

@@ -34,6 +34,9 @@ run_tests:
   call clear_test_arena
   call test_get_tte_typed_metadata
 
+  call clear_test_arena
+  call test_get_direct_addressing_ModRM
+
   ret
   .msg db "running test suite...", 0x0A, 0x00
 
@@ -441,7 +444,8 @@ test_get_tte_typed_metadata:
 
   mov di, 0x0003              ; rdx
   call get_tte_typed_metadata
-  cmp al, 0x03                ; width: 64 bits
+  cmp al, 00001011b           ; reg: 010b
+                              ; width: 11b (64 bits)
   jne .fail
 
   mov di, 0x0056              ; mov
@@ -462,7 +466,52 @@ test_get_tte_typed_metadata:
     mov rsi, msg_fail
     call print
     ret
-  .msg db "test_get_tte_type...", 0x00
+  .msg db "test_get_tte_typed_metadata...", 0x00
+
+; ------------------------------------------------------------------------------
+; test_get_direct_addressing_ModRM
+;
+; description:
+; tests get_direct_addressing_ModRM described functionality
+; ------------------------------------------------------------------------------
+
+test_get_direct_addressing_ModRM:
+  mov rsi, .msg
+  call print
+
+  mov di, 0x0000 ; rax
+  mov si, 0x0000 ; rax
+  call get_direct_addressing_ModRM
+  cmp al, 11000000b ; Mod Reg R/M: 11b 000b 000b
+  jne .fail
+
+  mov di, 0x0000 ; rax
+  mov si, 0x0003 ; rdx
+  call get_direct_addressing_ModRM
+  cmp al, 11000010b ; Mod Reg R/M: 11b 000b 010b
+  jne .fail
+
+  mov di, 0x0003 ; rdx
+  mov si, 0x0000 ; rax
+  call get_direct_addressing_ModRM
+  cmp al, 11010000b ; Mod Reg R/M: 11b 010b 000b
+  jne .fail
+
+  mov di, 0x0003 ; rdx
+  mov si, 0x0003 ; rdx
+  call get_direct_addressing_ModRM
+  cmp al, 11010010b ; Mod Reg R/M 11b 010b 010b
+  jne .fail
+
+  .pass:
+    mov rsi, msg_pass
+    call print
+    ret
+  .fail:
+    mov rsi, msg_fail
+    call print
+    ret
+  .msg db "test_get_direct_addressing_ModRM...", 0x00
 
 msg_pass:
   db 0x0A