| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include "unwind.h" |
| 3 | #include "thread.h" |
| 4 | #include "session.h" |
| 5 | #include "debug.h" |
| 6 | #include "arch/common.h" |
| 7 | |
| 8 | struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops; |
| 9 | struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops; |
| 10 | struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops; |
| 11 | |
| 12 | static void unwind__register_ops(struct thread *thread, |
| 13 | struct unwind_libunwind_ops *ops) |
| 14 | { |
| 15 | thread->unwind_libunwind_ops = ops; |
| 16 | } |
| 17 | |
| 18 | int unwind__prepare_access(struct thread *thread, struct map *map, |
| 19 | bool *initialized) |
| 20 | { |
| 21 | const char *arch; |
| 22 | enum dso_type dso_type; |
| 23 | struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops; |
| 24 | int err; |
| 25 | |
| 26 | if (thread->addr_space) { |
| 27 | pr_debug("unwind: thread map already set, dso=%s\n", |
| 28 | map->dso->name); |
| 29 | if (initialized) |
| 30 | *initialized = true; |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | /* env->arch is NULL for live-mode (i.e. perf top) */ |
| 35 | if (!thread->mg->machine->env || !thread->mg->machine->env->arch) |
| 36 | goto out_register; |
| 37 | |
| 38 | dso_type = dso__type(map->dso, thread->mg->machine); |
| 39 | if (dso_type == DSO__TYPE_UNKNOWN) |
| 40 | return 0; |
| 41 | |
| 42 | arch = normalize_arch(thread->mg->machine->env->arch); |
| 43 | |
| 44 | if (!strcmp(arch, "x86")) { |
| 45 | if (dso_type != DSO__TYPE_64BIT) |
| 46 | ops = x86_32_unwind_libunwind_ops; |
| 47 | } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) { |
| 48 | if (dso_type == DSO__TYPE_64BIT) |
| 49 | ops = arm64_unwind_libunwind_ops; |
| 50 | } |
| 51 | |
| 52 | if (!ops) { |
| 53 | pr_err("unwind: target platform=%s is not supported\n", arch); |
| 54 | return 0; |
| 55 | } |
| 56 | out_register: |
| 57 | unwind__register_ops(thread, ops); |
| 58 | |
| 59 | err = thread->unwind_libunwind_ops->prepare_access(thread); |
| 60 | if (initialized) |
| 61 | *initialized = err ? false : true; |
| 62 | return err; |
| 63 | } |
| 64 | |
| 65 | void unwind__flush_access(struct thread *thread) |
| 66 | { |
| 67 | if (thread->unwind_libunwind_ops) |
| 68 | thread->unwind_libunwind_ops->flush_access(thread); |
| 69 | } |
| 70 | |
| 71 | void unwind__finish_access(struct thread *thread) |
| 72 | { |
| 73 | if (thread->unwind_libunwind_ops) |
| 74 | thread->unwind_libunwind_ops->finish_access(thread); |
| 75 | } |
| 76 | |
| 77 | int unwind__get_entries(unwind_entry_cb_t cb, void *arg, |
| 78 | struct thread *thread, |
| 79 | struct perf_sample *data, int max_stack) |
| 80 | { |
| 81 | if (thread->unwind_libunwind_ops) |
| 82 | return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack); |
| 83 | return 0; |
| 84 | } |