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-rw-r--r--tools/perf/util/unwind-libunwind.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
new file mode 100644
index 000000000..509c287ee
--- /dev/null
+++ b/tools/perf/util/unwind-libunwind.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "unwind.h"
+#include "dso.h"
+#include "map.h"
+#include "thread.h"
+#include "session.h"
+#include "debug.h"
+#include "env.h"
+#include "callchain.h"
+
+struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
+struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
+struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
+
+static void unwind__register_ops(struct maps *maps, struct unwind_libunwind_ops *ops)
+{
+ maps->unwind_libunwind_ops = ops;
+}
+
+int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized)
+{
+ const char *arch;
+ enum dso_type dso_type;
+ struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
+ int err;
+
+ if (!dwarf_callchain_users)
+ return 0;
+
+ if (maps->addr_space) {
+ pr_debug("unwind: thread map already set, dso=%s\n",
+ map->dso->name);
+ if (initialized)
+ *initialized = true;
+ return 0;
+ }
+
+ /* env->arch is NULL for live-mode (i.e. perf top) */
+ if (!maps->machine->env || !maps->machine->env->arch)
+ goto out_register;
+
+ dso_type = dso__type(map->dso, maps->machine);
+ if (dso_type == DSO__TYPE_UNKNOWN)
+ return 0;
+
+ arch = perf_env__arch(maps->machine->env);
+
+ if (!strcmp(arch, "x86")) {
+ if (dso_type != DSO__TYPE_64BIT)
+ ops = x86_32_unwind_libunwind_ops;
+ } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
+ if (dso_type == DSO__TYPE_64BIT)
+ ops = arm64_unwind_libunwind_ops;
+ }
+
+ if (!ops) {
+ pr_err("unwind: target platform=%s is not supported\n", arch);
+ return 0;
+ }
+out_register:
+ unwind__register_ops(maps, ops);
+
+ err = maps->unwind_libunwind_ops->prepare_access(maps);
+ if (initialized)
+ *initialized = err ? false : true;
+ return err;
+}
+
+void unwind__flush_access(struct maps *maps)
+{
+ if (maps->unwind_libunwind_ops)
+ maps->unwind_libunwind_ops->flush_access(maps);
+}
+
+void unwind__finish_access(struct maps *maps)
+{
+ if (maps->unwind_libunwind_ops)
+ maps->unwind_libunwind_ops->finish_access(maps);
+}
+
+int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
+ struct thread *thread,
+ struct perf_sample *data, int max_stack,
+ bool best_effort)
+{
+ if (thread->maps->unwind_libunwind_ops)
+ return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data,
+ max_stack, best_effort);
+ return 0;
+}