feat(debug): multi-architecture debugger support for arm64, riscv64, loong64

Assisted-by: MiMo V2.5 Pro

debug/watchpoint_linux_loong64.go

@@ -0,0 +1,47 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build linux && loong64
+
+package debug
+
+import "fmt"
+
+// WatchpointType selects what triggers the watchpoint.
+type WatchpointType int
+
+const (
+	WatchWrite WatchpointType = 1
+	WatchRead  WatchpointType = 3
+)
+
+// wpSlots tracks watchpoint slot occupancy.
+var wpSlots [4]bool
+
+func (s *Session) FindFreeWatchpointSlot() int {
+	for i := 0; i < 4; i++ {
+		if !wpSlots[i] {
+			return i
+		}
+	}
+	return -1
+}
+
+func (s *Session) IsWatchpointSlotUsed(slot int) bool {
+	if slot < 0 || slot > 3 {
+		return false
+	}
+	return wpSlots[slot]
+}
+
+func (s *Session) SetWatchpoint(slot int, addr uint64, typ WatchpointType, size int) error {
+	return fmt.Errorf("debug: hardware watchpoints not yet implemented for loong64")
+}
+
+func (s *Session) ClearWatchpoint(slot int) error {
+	return fmt.Errorf("debug: hardware watchpoints not yet implemented for loong64")
+}
+
+func (s *Session) ClearAllWatchpoints() error {
+	return nil
+}