gdb: add extended-remote support, implement vAttach

sysmodules/rosalina/include/gdb.h

@@ -62,10 +62,11 @@ enum
     GDB_FLAG_SELECTED = 1,
     GDB_FLAG_USED  = 2,
     GDB_FLAG_ALLOCATED_MASK = GDB_FLAG_SELECTED | GDB_FLAG_USED,
-    GDB_FLAG_NOACK = 4,
-    GDB_FLAG_PROCESS_CONTINUING = 8,
-    GDB_FLAG_TERMINATE_PROCESS = 16,
-    GDB_FLAG_ATTACHED_AT_START = 32,
+    GDB_FLAG_EXTENDED_REMOTE = 4,
+    GDB_FLAG_NOACK = 8,
+    GDB_FLAG_PROCESS_CONTINUING = 16,
+    GDB_FLAG_TERMINATE_PROCESS = 32,
+    GDB_FLAG_ATTACHED_AT_START = 64,
 };
 
 typedef enum GDBState
@@ -139,3 +140,4 @@ Result GDB_AttachToProcess(GDBContext *ctx);
 void GDB_DetachFromProcess(GDBContext *ctx);
 
 GDB_DECLARE_HANDLER(Unsupported);
+GDB_DECLARE_HANDLER(EnableExtendedMode);

sysmodules/rosalina/include/gdb/debug.h

@@ -28,6 +28,7 @@
 
 #include "gdb.h"
 
+GDB_DECLARE_VERBOSE_HANDLER(Attach);
 GDB_DECLARE_HANDLER(Detach);
 GDB_DECLARE_HANDLER(Kill);
 GDB_DECLARE_HANDLER(Break);