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 RC_CHK_ACCESS(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 struct dso *dso = map__dso(map); 26 struct machine *machine; 27 int err; 28 29 if (!dwarf_callchain_users) 30 return 0; 31 32 if (maps__addr_space(maps)) { 33 pr_debug("unwind: thread map already set, dso=%s\n", dso->name); 34 if (initialized) 35 *initialized = true; 36 return 0; 37 } 38 39 machine = maps__machine(maps); 40 /* env->arch is NULL for live-mode (i.e. perf top) */ 41 if (!machine->env || !machine->env->arch) 42 goto out_register; 43 44 dso_type = dso__type(dso, machine); 45 if (dso_type == DSO__TYPE_UNKNOWN) 46 return 0; 47 48 arch = perf_env__arch(machine->env); 49 50 if (!strcmp(arch, "x86")) { 51 if (dso_type != DSO__TYPE_64BIT) 52 ops = x86_32_unwind_libunwind_ops; 53 } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { 54 if (dso_type == DSO__TYPE_64BIT) 55 ops = arm64_unwind_libunwind_ops; 56 } 57 58 if (!ops) { 59 pr_warning_once("unwind: target platform=%s is not supported\n", arch); 60 return 0; 61 } 62 out_register: 63 unwind__register_ops(maps, ops); 64 65 err = maps__unwind_libunwind_ops(maps)->prepare_access(maps); 66 if (initialized) 67 *initialized = err ? false : true; 68 return err; 69 } 70 71 void unwind__flush_access(struct maps *maps) 72 { 73 const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps); 74 75 if (ops) 76 ops->flush_access(maps); 77 } 78 79 void unwind__finish_access(struct maps *maps) 80 { 81 const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps); 82 83 if (ops) 84 ops->finish_access(maps); 85 } 86 87 int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 88 struct thread *thread, 89 struct perf_sample *data, int max_stack, 90 bool best_effort) 91 { 92 const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(thread__maps(thread)); 93 94 if (ops) 95 return ops->get_entries(cb, arg, thread, data, max_stack, best_effort); 96 return 0; 97 } 98