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
unwind__register_ops(struct maps * maps,struct unwind_libunwind_ops * ops)15 static void unwind__register_ops(struct maps *maps, struct unwind_libunwind_ops *ops)
16 {
17 maps->unwind_libunwind_ops = ops;
18 }
19
unwind__prepare_access(struct maps * maps,struct map * map,bool * initialized)20 int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized)
21 {
22 const char *arch;
23 enum dso_type dso_type;
24 struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
25 int err;
26
27 if (!dwarf_callchain_users)
28 return 0;
29
30 if (maps->addr_space) {
31 pr_debug("unwind: thread map already set, dso=%s\n",
32 map->dso->name);
33 if (initialized)
34 *initialized = true;
35 return 0;
36 }
37
38 /* env->arch is NULL for live-mode (i.e. perf top) */
39 if (!maps->machine->env || !maps->machine->env->arch)
40 goto out_register;
41
42 dso_type = dso__type(map->dso, maps->machine);
43 if (dso_type == DSO__TYPE_UNKNOWN)
44 return 0;
45
46 arch = perf_env__arch(maps->machine->env);
47
48 if (!strcmp(arch, "x86")) {
49 if (dso_type != DSO__TYPE_64BIT)
50 ops = x86_32_unwind_libunwind_ops;
51 } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
52 if (dso_type == DSO__TYPE_64BIT)
53 ops = arm64_unwind_libunwind_ops;
54 }
55
56 if (!ops) {
57 pr_err("unwind: target platform=%s is not supported\n", arch);
58 return 0;
59 }
60 out_register:
61 unwind__register_ops(maps, ops);
62
63 err = maps->unwind_libunwind_ops->prepare_access(maps);
64 if (initialized)
65 *initialized = err ? false : true;
66 return err;
67 }
68
unwind__flush_access(struct maps * maps)69 void unwind__flush_access(struct maps *maps)
70 {
71 if (maps->unwind_libunwind_ops)
72 maps->unwind_libunwind_ops->flush_access(maps);
73 }
74
unwind__finish_access(struct maps * maps)75 void unwind__finish_access(struct maps *maps)
76 {
77 if (maps->unwind_libunwind_ops)
78 maps->unwind_libunwind_ops->finish_access(maps);
79 }
80
unwind__get_entries(unwind_entry_cb_t cb,void * arg,struct thread * thread,struct perf_sample * data,int max_stack)81 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
82 struct thread *thread,
83 struct perf_sample *data, int max_stack)
84 {
85 if (thread->maps->unwind_libunwind_ops)
86 return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
87 return 0;
88 }
89