1 // SPDX-License-Identifier: GPL-2.0 2 #include "unwind.h" 3 #include "map.h" 4 #include "thread.h" 5 #include "session.h" 6 #include "debug.h" 7 #include "env.h" 8 9 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops; 10 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops; 11 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops; 12 13 static void unwind__register_ops(struct thread *thread, 14 struct unwind_libunwind_ops *ops) 15 { 16 thread->unwind_libunwind_ops = ops; 17 } 18 19 int unwind__prepare_access(struct thread *thread, struct map *map, 20 bool *initialized) 21 { 22 const char *arch; 23 enum dso_type dso_type; 24 struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops; 25 int err; 26 27 if (thread->addr_space) { 28 pr_debug("unwind: thread map already set, dso=%s\n", 29 map->dso->name); 30 if (initialized) 31 *initialized = true; 32 return 0; 33 } 34 35 /* env->arch is NULL for live-mode (i.e. perf top) */ 36 if (!thread->mg->machine->env || !thread->mg->machine->env->arch) 37 goto out_register; 38 39 dso_type = dso__type(map->dso, thread->mg->machine); 40 if (dso_type == DSO__TYPE_UNKNOWN) 41 return 0; 42 43 arch = perf_env__arch(thread->mg->machine->env); 44 45 if (!strcmp(arch, "x86")) { 46 if (dso_type != DSO__TYPE_64BIT) 47 ops = x86_32_unwind_libunwind_ops; 48 } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { 49 if (dso_type == DSO__TYPE_64BIT) 50 ops = arm64_unwind_libunwind_ops; 51 } 52 53 if (!ops) { 54 pr_err("unwind: target platform=%s is not supported\n", arch); 55 return 0; 56 } 57 out_register: 58 unwind__register_ops(thread, ops); 59 60 err = thread->unwind_libunwind_ops->prepare_access(thread); 61 if (initialized) 62 *initialized = err ? false : true; 63 return err; 64 } 65 66 void unwind__flush_access(struct thread *thread) 67 { 68 if (thread->unwind_libunwind_ops) 69 thread->unwind_libunwind_ops->flush_access(thread); 70 } 71 72 void unwind__finish_access(struct thread *thread) 73 { 74 if (thread->unwind_libunwind_ops) 75 thread->unwind_libunwind_ops->finish_access(thread); 76 } 77 78 int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 79 struct thread *thread, 80 struct perf_sample *data, int max_stack) 81 { 82 if (thread->unwind_libunwind_ops) 83 return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); 84 return 0; 85 } 86