D38303.id116120.diff
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D38303.id116120.diff
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	diff --git a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
	--- a/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
	+++ b/sys/cddl/dev/dtrace/riscv/dtrace_isa.c
	@@ -231,8 +231,34 @@
	int
	dtrace_getustackdepth(void)
	{
	+ struct trapframe *tf;
	+ uintptr_t pc, fp, sp;
	+ int n = 0;

	- printf("IMPLEMENT ME: %s\n", __func__);
	+ if (curproc == NULL \|\| (tf = curthread->td_frame) == NULL)
	+ return (0);
	+
	+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_FAULT))
	+ return (-1);
	+
	+ pc = tf->tf_sepc;
	+ sp = tf->tf_sp;
	+ fp = tf->tf_s[0];
	+
	+ if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) {
	+ /*
	+ * In an entry probe. The frame pointer has not yet been
	+ * pushed (that happens in the function prologue). The
	+ * best approach is to add the current pc as a missing top
	+ * of stack and back the pc up to the caller, which is stored
	+ * at the current stack pointer address since the call
	+ * instruction puts it there right before the branch.
	+ */
	+ pc = tf->tf_ra;
	+ n++;
	+ }
	+
	+ n += dtrace_getustack_common(NULL, 0, pc, fp);

	return (0);
	}