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 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops; 9 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops; 10 11 static void unwind__register_ops(struct thread *thread, 12 struct unwind_libunwind_ops *ops) 13 { 14 thread->unwind_libunwind_ops = ops; 15 } 16 17 int unwind__prepare_access(struct thread *thread, struct map *map) 18 { 19 const char *arch; 20 enum dso_type dso_type; 21 struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops; 22 23 if (thread->addr_space) { 24 pr_debug("unwind: thread map already set, dso=%s\n", 25 map->dso->name); 26 return 0; 27 } 28 29 /* env->arch is NULL for live-mode (i.e. perf top) */ 30 if (!thread->mg->machine->env || !thread->mg->machine->env->arch) 31 goto out_register; 32 33 dso_type = dso__type(map->dso, thread->mg->machine); 34 if (dso_type == DSO__TYPE_UNKNOWN) 35 return 0; 36 37 arch = normalize_arch(thread->mg->machine->env->arch); 38 39 if (!strcmp(arch, "x86")) { 40 if (dso_type != DSO__TYPE_64BIT) 41 ops = x86_32_unwind_libunwind_ops; 42 } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { 43 if (dso_type == DSO__TYPE_64BIT) 44 ops = arm64_unwind_libunwind_ops; 45 } 46 47 if (!ops) { 48 pr_err("unwind: target platform=%s is not supported\n", arch); 49 return -1; 50 } 51 out_register: 52 unwind__register_ops(thread, ops); 53 54 return thread->unwind_libunwind_ops->prepare_access(thread); 55 } 56 57 void unwind__flush_access(struct thread *thread) 58 { 59 if (thread->unwind_libunwind_ops) 60 thread->unwind_libunwind_ops->flush_access(thread); 61 } 62 63 void unwind__finish_access(struct thread *thread) 64 { 65 if (thread->unwind_libunwind_ops) 66 thread->unwind_libunwind_ops->finish_access(thread); 67 } 68 69 int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 70 struct thread *thread, 71 struct perf_sample *data, int max_stack) 72 { 73 if (thread->unwind_libunwind_ops) 74 return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); 75 return 0; 76 } 77