1 // SPDX-License-Identifier: GPL-2.0 2 #include "unwind.h" 3 #include "dso.h" 4 #include "map.h" 5 #include "thread.h" 6 #include "session.h" 7 #include "debug.h" 8 #include "env.h" 9 #include "callchain.h" 10 11 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops; 12 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops; 13 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops; 14 15 static void unwind__register_ops(struct maps *maps, struct unwind_libunwind_ops *ops) 16 { 17 maps->unwind_libunwind_ops = ops; 18 } 19 20 int unwind__prepare_access(struct maps *maps, struct map *map, 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 (!dwarf_callchain_users) 28 return 0; 29 30 if (maps->addr_space) { 31 pr_debug("unwind: thread map already set, dso=%s\n", 32 map->dso->name); 33 if (initialized) 34 *initialized = true; 35 return 0; 36 } 37 38 /* env->arch is NULL for live-mode (i.e. perf top) */ 39 if (!maps->machine->env || !maps->machine->env->arch) 40 goto out_register; 41 42 dso_type = dso__type(map->dso, maps->machine); 43 if (dso_type == DSO__TYPE_UNKNOWN) 44 return 0; 45 46 arch = perf_env__arch(maps->machine->env); 47 48 if (!strcmp(arch, "x86")) { 49 if (dso_type != DSO__TYPE_64BIT) 50 ops = x86_32_unwind_libunwind_ops; 51 } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { 52 if (dso_type == DSO__TYPE_64BIT) 53 ops = arm64_unwind_libunwind_ops; 54 } 55 56 if (!ops) { 57 pr_err("unwind: target platform=%s is not supported\n", arch); 58 return 0; 59 } 60 out_register: 61 unwind__register_ops(maps, ops); 62 63 err = maps->unwind_libunwind_ops->prepare_access(maps); 64 if (initialized) 65 *initialized = err ? false : true; 66 return err; 67 } 68 69 void unwind__flush_access(struct maps *maps) 70 { 71 if (maps->unwind_libunwind_ops) 72 maps->unwind_libunwind_ops->flush_access(maps); 73 } 74 75 void unwind__finish_access(struct maps *maps) 76 { 77 if (maps->unwind_libunwind_ops) 78 maps->unwind_libunwind_ops->finish_access(maps); 79 } 80 81 int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 82 struct thread *thread, 83 struct perf_sample *data, int max_stack, 84 bool best_effort) 85 { 86 if (thread->maps->unwind_libunwind_ops) 87 return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data, 88 max_stack, best_effort); 89 return 0; 90 } 91