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1// SPDX-License-Identifier: GPL-2.02#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 11struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;12struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;13struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;14 15int 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(dso));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 }57out_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 66void 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 74void 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 82int 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