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 <[email protected]> --- 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 79ca40e69268..8632b43b6a33 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(u64 watch_addr, u64 watch_len); void ksw_watch_off(void); +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 d95efefdffe9..87bbe54bb5d3 100644 --- a/mm/kstackwatch/watch.c +++ b/mm/kstackwatch/watch.c @@ -185,3 +185,21 @@ 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
