The branch main has been updated by mhorne:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=13f5a3076bc8f3774b82f2d5ca29e2e0e2af997b

commit 13f5a3076bc8f3774b82f2d5ca29e2e0e2af997b
Author:     Mitchell Horne <mho...@freebsd.org>
AuthorDate: 2021-05-19 16:29:59 +0000
Commit:     Mitchell Horne <mho...@freebsd.org>
CommitDate: 2021-06-30 21:21:23 +0000

    hwpmc_arm64: add a PMCDBG to the interrupt handler
    
    MFC after:      3 days
    Sponsored by:   The FreeBSD Foundation
---
 sys/dev/hwpmc/hwpmc_arm64.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/dev/hwpmc/hwpmc_arm64.c b/sys/dev/hwpmc/hwpmc_arm64.c
index 6b98fb46e7f1..84a8791287f7 100644
--- a/sys/dev/hwpmc/hwpmc_arm64.c
+++ b/sys/dev/hwpmc/hwpmc_arm64.c
@@ -359,6 +359,9 @@ arm64_intr(struct trapframe *tf)
        KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
            ("[arm64,%d] CPU %d out of range", __LINE__, cpu));
 
+       PMCDBG3(MDP,INT,1, "cpu=%d tf=%p um=%d", cpu, (void *)tf,
+           TRAPF_USERMODE(tf));
+
        retval = 0;
        pc = arm64_pcpu[cpu];
 
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