perf unwind: Check the target platform before assigning unwind methods

[linux-2.6-block.git] / tools / perf / util / unwind-libunwind.c

diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index f86f903ae8a8d44e968f8b344b0d05f25f485d2f..0086726e00e018d3815ae7dd17fd3a33e94b1e35 100644 (file)
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -1,5 +1,8 @@
 #include "unwind.h"
 #include "thread.h"
+#include "session.h"
+#include "debug.h"
+#include "arch/common.h"
 
 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
 
@@ -9,8 +12,28 @@ static void unwind__register_ops(struct thread *thread,
        thread->unwind_libunwind_ops = ops;
 }
 
-int unwind__prepare_access(struct thread *thread)
+int unwind__prepare_access(struct thread *thread, struct map *map)
 {
+       const char *arch;
+       enum dso_type dso_type;
+
+       if (thread->addr_space) {
+               pr_debug("unwind: thread map already set, dso=%s\n",
+                        map->dso->name);
+               return 0;
+       }
+
+       /* env->arch is NULL for live-mode (i.e. perf top) */
+       if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
+               goto out_register;
+
+       dso_type = dso__type(map->dso, thread->mg->machine);
+       if (dso_type == DSO__TYPE_UNKNOWN)
+               return 0;
+
+       arch = normalize_arch(thread->mg->machine->env->arch);
+       pr_debug("unwind: target platform=%s\n", arch);
+out_register:
        unwind__register_ops(thread, local_unwind_libunwind_ops);
 
        return thread->unwind_libunwind_ops->prepare_access(thread);