D28942.diff
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	diff --git a/sys/arm64/include/db_machdep.h b/sys/arm64/include/db_machdep.h
	--- a/sys/arm64/include/db_machdep.h
	+++ b/sys/arm64/include/db_machdep.h
	@@ -38,6 +38,7 @@
	#include <machine/trap.h>

	#define T_BREAKPOINT (EXCP_BRK)
	+#define T_SINGLESTEP (EXCP_SOFTSTP_EL1)
	#define T_WATCHPOINT (EXCP_WATCHPT_EL1)

	typedef vm_offset_t db_addr_t;
	@@ -58,6 +59,7 @@
	#define db_set_single_step kdb_cpu_set_singlestep

	#define IS_BREAKPOINT_TRAP(type, code) (type == T_BREAKPOINT)
	+#define IS_SSTEP_TRAP(type, code) (type == T_SINGLESTEP)
	#define IS_WATCHPOINT_TRAP(type, code) (type == T_WATCHPOINT)

	#define inst_trap_return(ins) (0)