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
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
15static void unwind__register_ops(struct maps *maps, struct unwind_libunwind_ops *ops)
16{
17	maps->unwind_libunwind_ops = ops;
18}
19
20int 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	}
60out_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
69void unwind__flush_access(struct maps *maps)
70{
71	if (maps->unwind_libunwind_ops)
72		maps->unwind_libunwind_ops->flush_access(maps);
73}
74
75void unwind__finish_access(struct maps *maps)
76{
77	if (maps->unwind_libunwind_ops)
78		maps->unwind_libunwind_ops->finish_access(maps);
79}
80
81int 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}