1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/stacktrace/frame.h b/arch/arm64/include/asm/stacktrace/frame.h
new file mode 100644
index 000000000000..0ee0f6ba0fd8
--- /dev/null
+++ b/arch/arm64/include/asm/stacktrace/frame.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_STACKTRACE_FRAME_H
+#define __ASM_STACKTRACE_FRAME_H
+
+/*
+ * - FRAME_META_TYPE_NONE
+ *
+ *   This value is reserved.
+ *
+ * - FRAME_META_TYPE_FINAL
+ *
+ *   The record is the last entry on the stack.
+ *   Unwinding should terminate successfully.
+ *
+ * - FRAME_META_TYPE_PT_REGS
+ *
+ *   The record is embedded within a struct pt_regs, recording the registers at
+ *   an arbitrary point in time.
+ *   Unwinding should consume pt_regs::pc, followed by pt_regs::lr.
+ *
+ * Note: all other values are reserved and should result in unwinding
+ * terminating with an error.
+ */
+#define FRAME_META_TYPE_NONE		0
+#define FRAME_META_TYPE_FINAL		1
+#define FRAME_META_TYPE_PT_REGS		2
+
+#ifndef __ASSEMBLY__
+/* 
+ * A standard AAPCS64 frame record.
+ */
+struct frame_record {
+	u64 fp;
+	u64 lr;
+};
+
+/*
+ * A metadata frame record indicating a special unwind.
+ * The record::{fp,lr} fields must be zero to indicate the presence of
+ * metadata.
+ */
+struct frame_record_meta {
+	struct frame_record record;
+	u64 type;
+};
+#endif /* __ASSEMBLY */
+
+#endif /* __ASM_STACKTRACE_FRAME_H */