git: e152c882738f - main - arm64: add definition for IS_SSTEP_TRAP()

[Mitchell Horne]

The branch main has been updated by mhorne:

URL: https://cgit.FreeBSD.org/src/commit/?id=e152c882738ffe26a2f52e420e2a92c014943207

commit e152c882738ffe26a2f52e420e2a92c014943207
Author:     Mitchell Horne <mhorne at FreeBSD.org>
AuthorDate: 2021-03-01 14:01:25 +0000
Commit:     Mitchell Horne <mhorne at FreeBSD.org>
CommitDate: 2021-03-01 14:04:23 +0000

    arm64: add definition for IS_SSTEP_TRAP()
    
    arm64 has a distinct exception code for single-step, so we can use this
    to detect when an unexpected SS trap is encountered, or when an expected
    one is not. See db_stop_at_pc().
    
    Reviewed by:    markj, jhb
    MFC after:      5 days
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D28942
---
 sys/arm64/include/db_machdep.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/arm64/include/db_machdep.h b/sys/arm64/include/db_machdep.h
index 61b58415e41c..105e8e507ce3 100644
--- 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 @@ typedef long		db_expr_t;
 #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)