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 int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized) 16 { 17 const char *arch; 18 enum dso_type dso_type; 19 struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops; 20 struct dso *dso = map__dso(map); 21 struct machine *machine; 22 int err; 23 24 if (!dwarf_callchain_users) 25 return 0; 26 27 if (maps__addr_space(maps)) { 28 pr_debug("unwind: thread map already set, dso=%s\n", dso->name); 29 if (initialized) 30 *initialized = true; 31 return 0; 32 } 33 34 machine = maps__machine(maps); 35 /* env->arch is NULL for live-mode (i.e. perf top) */ 36 if (!machine->env || !machine->env->arch) 37 goto out_register; 38 39 dso_type = dso__type(dso, machine); 40 if (dso_type == DSO__TYPE_UNKNOWN) 41 return 0; 42 43 arch = perf_env__arch(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_warning_once("unwind: target platform=%s is not supported\n", arch); 55 return 0; 56 } 57 out_register: 58 maps__set_unwind_libunwind_ops(maps, ops); 59 60 err = maps__unwind_libunwind_ops(maps)->prepare_access(maps); 61 if (initialized) 62 *initialized = err ? false : true; 63 return err; 64 } 65 66 void unwind__flush_access(struct maps *maps) 67 { 68 const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps); 69 70 if (ops) 71 ops->flush_access(maps); 72 } 73 74 void unwind__finish_access(struct maps *maps) 75 { 76 const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps); 77 78 if (ops) 79 ops->finish_access(maps); 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 bool best_effort) 86 { 87 const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(thread__maps(thread)); 88 89 if (ops) 90 return ops->get_entries(cb, arg, thread, data, max_stack, best_effort); 91 return 0; 92 } 93