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(env: 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 | |