Other debugging code.

boot/idt.asm

@@ -206,6 +206,9 @@ single_step_handler:
   pusha
   mov ebp, esp
 
+  ;; Fix ESP, because EFLAGS, CS and EIP have been pushed in the meantime
+  add DWORD [ebp+0x0c], 12
+
   ;; Possibly call the user defined handler
   mov eax, [SINGLE_STEP_HANDLER]
   test eax, eax

lib/io.asm

@@ -263,8 +263,12 @@ write_hex:
 
 
 single_stepping_handler:
-  ;; cmp DWORD [instr_num], 0x3129
-  ;; jne single_stepping_handler_end
+  mov ebx, [instr_num]
+  sub ebx, 0x15000
+  cmp ebx, 0
+  jl single_stepping_handler_end
+  cmp ebx, 0x2000
+  jge shutdown
 
   mov ebx, [esp+4]
   mov esi, str_instr_num
@@ -319,8 +323,6 @@ enable_single_stepping:
   mov DWORD [instr_num], 0x3126
   mov DWORD [0x10010], single_stepping_handler
   call [0x1001c]
-  cmp DWORD [term_row], 0
-  jne platform_panic
   ret