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 #include "callchain.h" 9 10 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops; 11 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops; 12 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops; 13 14 static void unwind__register_ops(struct map_groups *mg, 15 struct unwind_libunwind_ops *ops) 16 { 17 mg->unwind_libunwind_ops = ops; 18 } 19 20 int unwind__prepare_access(struct map_groups *mg, struct map *map, 21 bool *initialized) 22 { 23 const char *arch; 24 enum dso_type dso_type; 25 struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops; 26 int err; 27 28 if (!dwarf_callchain_users) 29 return 0; 30 31 if (mg->addr_space) { 32 pr_debug("unwind: thread map already set, dso=%s\n", 33 map->dso->name); 34 if (initialized) 35 *initialized = true; 36 return 0; 37 } 38 39 /* env->arch is NULL for live-mode (i.e. perf top) */ 40 if (!mg->machine->env || !mg->machine->env->arch) 41 goto out_register; 42 43 dso_type = dso__type(map->dso, mg->machine); 44 if (dso_type == DSO__TYPE_UNKNOWN) 45 return 0; 46 47 arch = perf_env__arch(mg->machine->env); 48 49 if (!strcmp(arch, "x86")) { 50 if (dso_type != DSO__TYPE_64BIT) 51 ops = x86_32_unwind_libunwind_ops; 52 } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { 53 if (dso_type == DSO__TYPE_64BIT) 54 ops = arm64_unwind_libunwind_ops; 55 } 56 57 if (!ops) { 58 pr_err("unwind: target platform=%s is not supported\n", arch); 59 return 0; 60 } 61 out_register: 62 unwind__register_ops(mg, ops); 63 64 err = mg->unwind_libunwind_ops->prepare_access(mg); 65 if (initialized) 66 *initialized = err ? false : true; 67 return err; 68 } 69 70 void unwind__flush_access(struct map_groups *mg) 71 { 72 if (mg->unwind_libunwind_ops) 73 mg->unwind_libunwind_ops->flush_access(mg); 74 } 75 76 void unwind__finish_access(struct map_groups *mg) 77 { 78 if (mg->unwind_libunwind_ops) 79 mg->unwind_libunwind_ops->finish_access(mg); 80 } 81 82 int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 83 struct thread *thread, 84 struct perf_sample *data, int max_stack) 85 { 86 if (thread->mg->unwind_libunwind_ops) 87 return thread->mg->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); 88 return 0; 89 } 90