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}

 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			 bool best_effort)
85{
86	if (thread->maps->unwind_libunwind_ops)
87		return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data,
88								       max_stack, best_effort);
89	return 0;
90}