tools/perf/util/unwind-libunwind.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "unwind.h"
   3 #include "map.h"
   4 #include "thread.h"
   5 #include "session.h"
   6 #include "debug.h"
   7 #include "env.h"
   8
   9 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
  10 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
  11 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
  12
  13 static void unwind__register_ops(struct thread *thread,
  14                           struct unwind_libunwind_ops *ops)
  15 {
  16         thread->unwind_libunwind_ops = ops;
  17 }
  18
  19 int unwind__prepare_access(struct thread *thread, struct map *map,
  20                            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 (thread->addr_space) {
  28                 pr_debug("unwind: thread map already set, dso=%s\n",
  29                          map->dso->name);
  30                 if (initialized)
  31                         *initialized = true;
  32                 return 0;
  33         }
  34
  35         /* env->arch is NULL for live-mode (i.e. perf top) */
  36         if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
  37                 goto out_register;
  38
  39         dso_type = dso__type(map->dso, thread->mg->machine);
  40         if (dso_type == DSO__TYPE_UNKNOWN)
  41                 return 0;
  42
  43         arch = perf_env__arch(thread->mg->machine->env);
  44
  45         if (!strcmp(arch, "x86")) {
  46                 if (dso_type != DSO__TYPE_64BIT)
  47                         ops = x86_32_unwind_libunwind_ops;
  48         } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
  49                 if (dso_type == DSO__TYPE_64BIT)
  50                         ops = arm64_unwind_libunwind_ops;
  51         }
  52
  53         if (!ops) {
  54                 pr_err("unwind: target platform=%s is not supported\n", arch);
  55                 return 0;
  56         }
  57 out_register:
  58         unwind__register_ops(thread, ops);
  59
  60         err = thread->unwind_libunwind_ops->prepare_access(thread);
  61         if (initialized)
  62                 *initialized = err ? false : true;
  63         return err;
  64 }
  65
  66 void unwind__flush_access(struct thread *thread)
  67 {
  68         if (thread->unwind_libunwind_ops)
  69                 thread->unwind_libunwind_ops->flush_access(thread);
  70 }
  71
  72 void unwind__finish_access(struct thread *thread)
  73 {
  74         if (thread->unwind_libunwind_ops)
  75                 thread->unwind_libunwind_ops->finish_access(thread);
  76 }
  77
  78 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
  79                          struct thread *thread,
  80                          struct perf_sample *data, int max_stack)
  81 {
  82         if (thread->unwind_libunwind_ops)
  83                 return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
  84         return 0;
  85 }