1 #include "unwind.h" 2 #include "thread.h" 3 #include "session.h" 4 #include "debug.h" 5 #include "arch/common.h" 6 7 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops; 8 9 static void unwind__register_ops(struct thread *thread, 10 struct unwind_libunwind_ops *ops) 11 { 12 thread->unwind_libunwind_ops = ops; 13 } 14 15 int unwind__prepare_access(struct thread *thread, struct map *map) 16 { 17 const char *arch; 18 enum dso_type dso_type; 19 20 if (thread->addr_space) { 21 pr_debug("unwind: thread map already set, dso=%s\n", 22 map->dso->name); 23 return 0; 24 } 25 26 /* env->arch is NULL for live-mode (i.e. perf top) */ 27 if (!thread->mg->machine->env || !thread->mg->machine->env->arch) 28 goto out_register; 29 30 dso_type = dso__type(map->dso, thread->mg->machine); 31 if (dso_type == DSO__TYPE_UNKNOWN) 32 return 0; 33 34 arch = normalize_arch(thread->mg->machine->env->arch); 35 pr_debug("unwind: target platform=%s\n", arch); 36 out_register: 37 unwind__register_ops(thread, local_unwind_libunwind_ops); 38 39 return thread->unwind_libunwind_ops->prepare_access(thread); 40 } 41 42 void unwind__flush_access(struct thread *thread) 43 { 44 if (thread->unwind_libunwind_ops) 45 thread->unwind_libunwind_ops->flush_access(thread); 46 } 47 48 void unwind__finish_access(struct thread *thread) 49 { 50 if (thread->unwind_libunwind_ops) 51 thread->unwind_libunwind_ops->finish_access(thread); 52 } 53 54 int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 55 struct thread *thread, 56 struct perf_sample *data, int max_stack) 57 { 58 if (thread->unwind_libunwind_ops) 59 return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); 60 return 0; 61 } 62