1 #include "unwind.h"
2 #include "thread.h"
3 #include "session.h"
4 #include "debug.h"
5 #include "arch/common.h"
6 
7 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
8 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
9 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
10 
11 static void unwind__register_ops(struct thread *thread,
12 			  struct unwind_libunwind_ops *ops)
13 {
14 	thread->unwind_libunwind_ops = ops;
15 }
16 
17 int 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 	}
55 out_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 
64 void unwind__flush_access(struct thread *thread)
65 {
66 	if (thread->unwind_libunwind_ops)
67 		thread->unwind_libunwind_ops->flush_access(thread);
68 }
69 
70 void unwind__finish_access(struct thread *thread)
71 {
72 	if (thread->unwind_libunwind_ops)
73 		thread->unwind_libunwind_ops->finish_access(thread);
74 }
75 
76 int 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 }
84