D52475.diff
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	diff --git a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
	--- a/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
	+++ b/sys/cddl/dev/dtrace/aarch64/dtrace_isa.c
	@@ -228,10 +228,22 @@
	int
	dtrace_getustackdepth(void)
	{
	+ proc_t *p = curproc;
	+ struct trapframe *tf;
	+ uintptr_t pc, fp;
	+ int n = 0;

	- printf("IMPLEMENT ME: %s\n", __func__);
	+ if (p == NULL \|\| (tf = curthread->td_frame) == NULL)
	+ return (0);
	+
	+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_FAULT))
	+ return (-1);
	+
	+ pc = tf->tf_elr;
	+ fp = tf->tf_x[29];
	+ n += dtrace_getustack_common(NULL, 0, pc, fp);

	- return (0);
	+ return (n);
	}

	void