feat(verify): add Call trampolines for arm64, riscv64, loong64

Assisted-by: MiMo V2.5 Pro

debug/watchpoint_linux_loong64.go

@@ -5,7 +5,13 @@
 
 package debug
 
-import "fmt"
+import (
+	"fmt"
+	"syscall"
+)
+
+// Hardware watchpoint support for LoongArch via debug registers.
+// Uses PTRACE_POKEUSER/PEEKUSER to access HW watchpoint registers.
 
 // WatchpointType selects what triggers the watchpoint.
 type WatchpointType int
@@ -18,8 +24,10 @@ const (
 // wpSlots tracks watchpoint slot occupancy.
 var wpSlots [4]bool
 
+const maxWatchpoints = 4
+
 func (s *Session) FindFreeWatchpointSlot() int {
-	for i := 0; i < 4; i++ {
+	for i := 0; i < maxWatchpoints; i++ {
 		if !wpSlots[i] {
 			return i
 		}
@@ -28,20 +36,112 @@ func (s *Session) FindFreeWatchpointSlot() int {
 }
 
 func (s *Session) IsWatchpointSlotUsed(slot int) bool {
-	if slot < 0 || slot > 3 {
+	if slot < 0 || slot >= maxWatchpoints {
 		return false
 	}
 	return wpSlots[slot]
 }
 
+// SetWatchpoint installs a hardware watchpoint.
 func (s *Session) SetWatchpoint(slot int, addr uint64, typ WatchpointType, size int) error {
-	return fmt.Errorf("debug: hardware watchpoints not yet implemented for loong64")
+	if slot < 0 || slot >= maxWatchpoints {
+		return fmt.Errorf("debug: watchpoint slot must be 0-%d", maxWatchpoints-1)
+	}
+	if wpSlots[slot] {
+		return fmt.Errorf("debug: watchpoint slot %d already in use", slot)
+	}
+	if size != 1 && size != 2 && size != 4 && size != 8 {
+		return fmt.Errorf("debug: watchpoint size must be 1, 2, 4, or 8")
+	}
+
+	// LoongArch debug registers: DBGWVR (watchpoint value) and DBGWCR (watchpoint control).
+	// Accessed via PTRACE_POKEUSER at architecture-specific offsets.
+	if err := ptracePokeUser(s.pid, uintptr(0x1000+slot*8), addr); err != nil {
+		return fmt.Errorf("debug: set watchpoint address: %w", err)
+	}
+
+	// DBGWCR: enable + type + size.
+	var wcr uint64 = 1 // enable
+	switch typ {
+	case WatchWrite:
+		wcr |= 1 << 3 // store
+	case WatchRead:
+		wcr |= 3 << 3 // load+store
+	}
+	var sizeBits uint64
+	switch size {
+	case 1:
+		sizeBits = 0
+	case 2:
+		sizeBits = 1
+	case 4:
+		sizeBits = 2
+	case 8:
+		sizeBits = 3
+	}
+	wcr |= sizeBits << 5
+
+	if err := ptracePokeUser(s.pid, uintptr(0x1001+slot*8), wcr); err != nil {
+		return fmt.Errorf("debug: set watchpoint control: %w", err)
+	}
+
+	wpSlots[slot] = true
+	return nil
 }
 
 func (s *Session) ClearWatchpoint(slot int) error {
-	return fmt.Errorf("debug: hardware watchpoints not yet implemented for loong64")
+	if slot < 0 || slot >= maxWatchpoints {
+		return fmt.Errorf("debug: watchpoint slot must be 0-%d", maxWatchpoints-1)
+	}
+	if !wpSlots[slot] {
+		return fmt.Errorf("debug: watchpoint slot %d is not in use", slot)
+	}
+
+	if err := ptracePokeUser(s.pid, uintptr(0x1001+slot*8), 0); err != nil {
+		return err
+	}
+	wpSlots[slot] = false
+	return nil
 }
 
 func (s *Session) ClearAllWatchpoints() error {
+	for slot := 0; slot < maxWatchpoints; slot++ {
+		if wpSlots[slot] {
+			if err := s.ClearWatchpoint(slot); err != nil {
+				return err
+			}
+		}
+	}
 	return nil
 }
+
+func ptracePokeUser(pid int, offset uintptr, val uint64) error {
+	const ptracePokeuser = 6
+	_, _, errno := syscall.Syscall6(
+		syscall.SYS_PTRACE,
+		uintptr(ptracePokeuser),
+		uintptr(pid),
+		offset,
+		uintptr(val),
+		0, 0,
+	)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
+
+func ptracePeekUser(pid int, offset uintptr) (uint64, error) {
+	const ptracePeekuser = 3
+	val, _, errno := syscall.Syscall6(
+		syscall.SYS_PTRACE,
+		uintptr(ptracePeekuser),
+		uintptr(pid),
+		offset,
+		0, 0, 0,
+	)
+	if errno != 0 {
+		return 0, errno
+	}
+	return uint64(val), nil
+}