Implemented next/step

Imanol-Mikel Barba Sabariego
1 parent b24f5df3
Showing 1 changed file with 24 additions and 2 deletions
debug.c
@@ -13,6 +13,7 @@ uint16_t breakpoints[0xFF];
 uint16_t nbpoints = 0;
 char lastchoice = 0;
 uint8_t terminate = 0;
+uint8_t break_on_next = 0;
 void to_debugger(int signal)
 {
@@ -112,6 +113,7 @@ void query()
                 end = 1;
                 break;
             case 'n':
+                break_on_next = 1;
                 end = 1;
                 break;
             case 'r':
@@ -121,11 +123,14 @@ void query()
                 sscanf(input,"m %hX\n",&mempos);
                 fprintf(stderr,"%02X: %02x\n",mempos,mem[mempos]);
                 break;
-            case 's':
-                sscanf(input,"s %s\n",filename);
+            case 't':
+                sscanf(input,"t %s\n",filename);
                 save_state(filename);
                 fprintf(stderr,"Saved state as %s",filename);
                 break;
+            case 's':
+                end = 1;
+                break;
             case 'l':
                 sscanf(input,"l %s\n",filename);
                 load_state(filename);
@@ -140,6 +145,9 @@ void query()
                 terminate = 1;
                 end = 1;
                 break;
+            case 'h':
+                //print_debug_commands();
+                break;
             default:
                 break;
         }
@@ -301,6 +309,7 @@ void debug_program()
         }
         if(breakpoint)
         {
+            break_on_next = 0;
             fprintf(stderr, "cycle: %d\n", cycle_count);
             fprintf(stderr, "%02X: ", pc);
             print_instruction(mem[pc], mem[pc+1], mem[pc+2], mem[pc+3]);
@@ -315,6 +324,19 @@ void debug_program()
             }
         }
         uint16_t opcode = fetch_debug();
+        if(opcode == CALL && break_on_next != 0)
+        {
+            breakpoint = 0;
+            break_on_next++;
+        }
+        else if(opcode == RET && break_on_next != 0)
+        {
+            if(--break_on_next == 1)
+            {
+                breakpoint = 1;
+                break_on_next = 0;
+            }
+        }
         decode_instruction(opcode, &arg1, &arg2, &arg3);
         if (execute_instruction(opcode, arg1, arg2, arg3))
         {