D27754.diff
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	diff --git a/sys/cddl/dev/fbt/riscv/fbt_isa.c b/sys/cddl/dev/fbt/riscv/fbt_isa.c
	--- a/sys/cddl/dev/fbt/riscv/fbt_isa.c
	+++ b/sys/cddl/dev/fbt/riscv/fbt_isa.c
	@@ -156,6 +156,19 @@
	if (fbt_excluded(name))
	return (0);

	+ /*
	+ * Some assembly-language exception handlers are not suitable for
	+ * instrumentation.
	+ */
	+ if (strcmp(name, "cpu_exception_handler") == 0)
	+ return (0);
	+ if (strcmp(name, "cpu_exception_handler_user") == 0)
	+ return (0);
	+ if (strcmp(name, "cpu_exception_handler_supervisor") == 0)
	+ return (0);
	+ if (strcmp(name, "do_trap_supervisor") == 0)
	+ return (0);
	+
	instr = (uint32_t *)(symval->value);
	limit = (uint32_t *)(symval->value + symval->size);