1 files changed, 90 insertions, 0 deletions
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
new file mode 100644
index 000000000..b2a03fa52
--- /dev/null
+++ b/tools/perf/util/unwind.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __UNWIND_H
+#define __UNWIND_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include "util/map_symbol.h"
+
+struct maps;
+struct perf_sample;
+struct thread;
+
+struct unwind_entry {
+	struct map_symbol ms;
+	u64		  ip;
+};
+
+typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
+
+struct unwind_libunwind_ops {
+	int (*prepare_access)(struct maps *maps);
+	void (*flush_access)(struct maps *maps);
+	void (*finish_access)(struct maps *maps);
+	int (*get_entries)(unwind_entry_cb_t cb, void *arg,
+			   struct thread *thread,
+			   struct perf_sample *data, int max_stack, bool best_effort);
+};
+
+#ifdef HAVE_DWARF_UNWIND_SUPPORT
+/*
+ * When best_effort is set, don't report errors and fail silently. This could
+ * be expanded in the future to be more permissive about things other than
+ * error messages.
+ */
+int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
+			struct thread *thread,
+			struct perf_sample *data, int max_stack,
+			bool best_effort);
+/* libunwind specific */
+#ifdef HAVE_LIBUNWIND_SUPPORT
+#ifndef LIBUNWIND__ARCH_REG_ID
+#define LIBUNWIND__ARCH_REG_ID(regnum) libunwind__arch_reg_id(regnum)
+#endif
+
+#ifndef LIBUNWIND__ARCH_REG_SP
+#define LIBUNWIND__ARCH_REG_SP PERF_REG_SP
+#endif
+
+#ifndef LIBUNWIND__ARCH_REG_IP
+#define LIBUNWIND__ARCH_REG_IP PERF_REG_IP
+#endif
+
+int LIBUNWIND__ARCH_REG_ID(int regnum);
+int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized);
+void unwind__flush_access(struct maps *maps);
+void unwind__finish_access(struct maps *maps);
+#else
+static inline int unwind__prepare_access(struct maps *maps __maybe_unused,
+					 struct map *map __maybe_unused,
+					 bool *initialized __maybe_unused)
+{
+	return 0;
+}
+
+static inline void unwind__flush_access(struct maps *maps __maybe_unused) {}
+static inline void unwind__finish_access(struct maps *maps __maybe_unused) {}
+#endif
+#else
+static inline int
+unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
+		    void *arg __maybe_unused,
+		    struct thread *thread __maybe_unused,
+		    struct perf_sample *data __maybe_unused,
+		    int max_stack __maybe_unused,
+		    bool best_effort __maybe_unused)
+{
+	return 0;
+}
+
+static inline int unwind__prepare_access(struct maps *maps __maybe_unused,
+					 struct map *map __maybe_unused,
+					 bool *initialized __maybe_unused)
+{
+	return 0;
+}
+
+static inline void unwind__flush_access(struct maps *maps __maybe_unused) {}
+static inline void unwind__finish_access(struct maps *maps __maybe_unused) {}
+#endif /* HAVE_DWARF_UNWIND_SUPPORT */
+#endif /* __UNWIND_H */