D27534.diff
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	Index: head/sys/riscv/riscv/trap.c
	===================================================================
	--- head/sys/riscv/riscv/trap.c
	+++ head/sys/riscv/riscv/trap.c
	@@ -179,6 +179,9 @@
	vm_offset_t va;
	struct proc *p;
	int error, sig, ucode;
	+#ifdef KDB
	+ bool handled;
	+#endif

	#ifdef KDB
	if (kdb_active) {
	@@ -250,6 +253,15 @@

	fatal:
	dump_regs(frame);
	+#ifdef KDB
	+ if (debugger_on_trap) {
	+ kdb_why = KDB_WHY_TRAP;
	+ handled = kdb_trap(frame->tf_scause & SCAUSE_CODE, 0, frame);
	+ kdb_why = KDB_WHY_UNSET;
	+ if (handled)
	+ return;
	+ }
	+#endif
	panic("Fatal page fault at %#lx: %#016lx", frame->tf_sepc, stval);
	}