tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}