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