1 files changed, 42 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/unwind.h b/arch/loongarch/include/asm/unwind.h
new file mode 100644
index 000000000..6af4718bd
--- /dev/null
+++ b/arch/loongarch/include/asm/unwind.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Most of this ideas comes from x86.
+ *
+ * Copyright (C) 2022 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_UNWIND_H
+#define _ASM_UNWIND_H
+
+#include <linux/sched.h>
+
+#include <asm/stacktrace.h>
+
+enum unwinder_type {
+	UNWINDER_GUESS,
+	UNWINDER_PROLOGUE,
+};
+
+struct unwind_state {
+	char type; /* UNWINDER_XXX */
+	struct stack_info stack_info;
+	struct task_struct *task;
+	bool first, error;
+	unsigned long sp, pc, ra;
+};
+
+void unwind_start(struct unwind_state *state,
+		  struct task_struct *task, struct pt_regs *regs);
+bool unwind_next_frame(struct unwind_state *state);
+unsigned long unwind_get_return_address(struct unwind_state *state);
+
+static inline bool unwind_done(struct unwind_state *state)
+{
+	return state->stack_info.type == STACK_TYPE_UNKNOWN;
+}
+
+static inline bool unwind_error(struct unwind_state *state)
+{
+	return state->error;
+}
+
+#endif /* _ASM_UNWIND_H */