Provide two debug helpers:
- ksw_watch_show(): print the current watch target address and length.
- ksw_watch_fire(): intentionally trigger the watchpoint immediately
by writing to the watched address, useful for testing HWBP behavior.
Signed-off-by: Jinchao Wang <wangjinchao600@xxxxxxxxx>
---
mm/kstackwatch/kstackwatch.h | 2 ++
mm/kstackwatch/watch.c | 18 ++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h
index 5ea2db76cdfb..9a4900df8ff8 100644
--- a/mm/kstackwatch/kstackwatch.h
+++ b/mm/kstackwatch/kstackwatch.h
@@ -47,5 +47,7 @@ int ksw_watch_init(void);
void ksw_watch_exit(void);
int ksw_watch_on(ulong watch_addr, u16 watch_len);
int ksw_watch_off(ulong watch_addr, u16 watch_len);
+void ksw_watch_show(void);
+void ksw_watch_fire(void);
#endif /* _KSTACKWATCH_H */
diff --git a/mm/kstackwatch/watch.c b/mm/kstackwatch/watch.c
index 795e779792da..2e9294595bf3 100644
--- a/mm/kstackwatch/watch.c
+++ b/mm/kstackwatch/watch.c
@@ -161,3 +161,21 @@ void ksw_watch_exit(void)
unregister_wide_hw_breakpoint(watch_events);
watch_events = NULL;
}
+
+/* self debug function */
+void ksw_watch_show(void)
+{
+ pr_info("watch target bp_addr: 0x%llx len:%llu\n", watch_attr.bp_addr,
+ watch_attr.bp_len);
+}
+EXPORT_SYMBOL_GPL(ksw_watch_show);
+
+/* self debug function */
+void ksw_watch_fire(void)
+{
+ char *ptr = (char *)watch_attr.bp_addr;
+
+ pr_warn("watch triggered immediately\n");
+ *ptr = 0x42; // This should trigger immediately for any bp_len
+}
+EXPORT_SYMBOL_GPL(ksw_watch_fire);
--
2.43.0
