| // SPDX-License-Identifier: GPL-2.0 |
| #include "unwind.h" |
| #include "dso.h" |
| #include "map.h" |
| #include "thread.h" |
| #include "session.h" |
| #include "debug.h" |
| #include "env.h" |
| #include "callchain.h" |
| |
| struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops; |
| struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops; |
| struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops; |
| |
| static void unwind__register_ops(struct map_groups *mg, |
| struct unwind_libunwind_ops *ops) |
| { |
| mg->unwind_libunwind_ops = ops; |
| } |
| |
| int unwind__prepare_access(struct map_groups *mg, struct map *map, |
| bool *initialized) |
| { |
| const char *arch; |
| enum dso_type dso_type; |
| struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops; |
| int err; |
| |
| if (!dwarf_callchain_users) |
| return 0; |
| |
| if (mg->addr_space) { |
| pr_debug("unwind: thread map already set, dso=%s\n", |
| map->dso->name); |
| if (initialized) |
| *initialized = true; |
| return 0; |
| } |
| |
| /* env->arch is NULL for live-mode (i.e. perf top) */ |
| if (!mg->machine->env || !mg->machine->env->arch) |
| goto out_register; |
| |
| dso_type = dso__type(map->dso, mg->machine); |
| if (dso_type == DSO__TYPE_UNKNOWN) |
| return 0; |
| |
| arch = perf_env__arch(mg->machine->env); |
| |
| if (!strcmp(arch, "x86")) { |
| if (dso_type != DSO__TYPE_64BIT) |
| ops = x86_32_unwind_libunwind_ops; |
| } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { |
| if (dso_type == DSO__TYPE_64BIT) |
| ops = arm64_unwind_libunwind_ops; |
| } |
| |
| if (!ops) { |
| pr_err("unwind: target platform=%s is not supported\n", arch); |
| return 0; |
| } |
| out_register: |
| unwind__register_ops(mg, ops); |
| |
| err = mg->unwind_libunwind_ops->prepare_access(mg); |
| if (initialized) |
| *initialized = err ? false : true; |
| return err; |
| } |
| |
| void unwind__flush_access(struct map_groups *mg) |
| { |
| if (mg->unwind_libunwind_ops) |
| mg->unwind_libunwind_ops->flush_access(mg); |
| } |
| |
| void unwind__finish_access(struct map_groups *mg) |
| { |
| if (mg->unwind_libunwind_ops) |
| mg->unwind_libunwind_ops->finish_access(mg); |
| } |
| |
| int unwind__get_entries(unwind_entry_cb_t cb, void *arg, |
| struct thread *thread, |
| struct perf_sample *data, int max_stack) |
| { |
| if (thread->mg->unwind_libunwind_ops) |
| return thread->mg->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); |
| return 0; |
| } |