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Subject[PATCH RFC 4/4] perf/core: Add breakpoint information to siginfo on SIGTRAP
From
Encode information from breakpoint attributes into siginfo_t, which
helps disambiguate which breakpoint fired.

Note, providing the event fd may be unreliable, since the event may have
been modified (via PERF_EVENT_IOC_MODIFY_ATTRIBUTES) between the event
triggering and the signal being delivered to user space.

Signed-off-by: Marco Elver <elver@google.com>
---
kernel/events/core.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 8718763045fd..d7908322d796 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6296,6 +6296,17 @@ static void perf_sigtrap(struct perf_event *event)
info.si_signo = SIGTRAP;
info.si_code = TRAP_PERF;
info.si_errno = event->attr.type;
+
+ switch (event->attr.type) {
+ case PERF_TYPE_BREAKPOINT:
+ info.si_addr = (void *)(unsigned long)event->attr.bp_addr;
+ info.si_perf = (event->attr.bp_len << 16) | (u64)event->attr.bp_type;
+ break;
+ default:
+ /* No additional info set. */
+ break;
+ }
+
force_sig_info(&info);
}

--
2.30.0.617.g56c4b15f3c-goog
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