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 "env.h"
 7
 8struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
 9struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
10struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
11
12static void unwind__register_ops(struct thread *thread,
13			  struct unwind_libunwind_ops *ops)
14{
15	thread->unwind_libunwind_ops = ops;
16}
17
18int 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 = perf_env__arch(thread->mg->machine->env);
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	}
56out_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
65void unwind__flush_access(struct thread *thread)
66{
67	if (thread->unwind_libunwind_ops)
68		thread->unwind_libunwind_ops->flush_access(thread);
69}
70
71void unwind__finish_access(struct thread *thread)
72{
73	if (thread->unwind_libunwind_ops)
74		thread->unwind_libunwind_ops->finish_access(thread);
75}
76
77int 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}

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