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 map_groups *mg,
16			  struct unwind_libunwind_ops *ops)
17{
18	mg->unwind_libunwind_ops = ops;
19}
20
21int unwind__prepare_access(struct map_groups *mg, struct map *map,
22			   bool *initialized)
23{
24	const char *arch;
25	enum dso_type dso_type;
26	struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
27	int err;
28
29	if (!dwarf_callchain_users)
30		return 0;
31
32	if (mg->addr_space) {
33		pr_debug("unwind: thread map already set, dso=%s\n",
34			 map->dso->name);
35		if (initialized)
36			*initialized = true;
37		return 0;
38	}
39
40	/* env->arch is NULL for live-mode (i.e. perf top) */
41	if (!mg->machine->env || !mg->machine->env->arch)
42		goto out_register;
43
44	dso_type = dso__type(map->dso, mg->machine);
45	if (dso_type == DSO__TYPE_UNKNOWN)
46		return 0;
47
48	arch = perf_env__arch(mg->machine->env);
49
50	if (!strcmp(arch, "x86")) {
51		if (dso_type != DSO__TYPE_64BIT)
52			ops = x86_32_unwind_libunwind_ops;
53	} else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
54		if (dso_type == DSO__TYPE_64BIT)
55			ops = arm64_unwind_libunwind_ops;
56	}
57
58	if (!ops) {
59		pr_err("unwind: target platform=%s is not supported\n", arch);
60		return 0;
61	}
62out_register:
63	unwind__register_ops(mg, ops);
64
65	err = mg->unwind_libunwind_ops->prepare_access(mg);
66	if (initialized)
67		*initialized = err ? false : true;
68	return err;
69}
70
71void unwind__flush_access(struct map_groups *mg)
72{
73	if (mg->unwind_libunwind_ops)
74		mg->unwind_libunwind_ops->flush_access(mg);
75}
76
77void unwind__finish_access(struct map_groups *mg)
78{
79	if (mg->unwind_libunwind_ops)
80		mg->unwind_libunwind_ops->finish_access(mg);
81}
82
83int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
84			 struct thread *thread,
85			 struct perf_sample *data, int max_stack)
86{
87	if (thread->mg->unwind_libunwind_ops)
88		return thread->mg->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
89	return 0;
90}