tools/perf/util/unwind-libunwind.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "unwind.h"
   3 #include "thread.h"
   4 #include "session.h"
   5 #include "debug.h"
   6 #include "arch/common.h"
   7
   8 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
   9 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
  10 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
  11
  12 static void unwind__register_ops(struct thread *thread,
  13                           struct unwind_libunwind_ops *ops)
  14 {
  15         thread->unwind_libunwind_ops = ops;
  16 }
  17
  18 int unwind__prepare_access(struct thread *thread, struct map *map,
  19                            bool *initialized)
  20 {
  21         const char *arch;
  22         enum dso_type dso_type;
  23         struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
  24         int err;
  25
  26         if (thread->addr_space) {
  27                 pr_debug("unwind: thread map already set, dso=%s\n",
  28                          map->dso->name);
  29                 if (initialized)
  30                         *initialized = true;
  31                 return 0;
  32         }
  33
  34         /* env->arch is NULL for live-mode (i.e. perf top) */
  35         if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
  36                 goto out_register;
  37
  38         dso_type = dso__type(map->dso, thread->mg->machine);
  39         if (dso_type == DSO__TYPE_UNKNOWN)
  40                 return 0;
  41
  42         arch = normalize_arch(thread->mg->machine->env->arch);
  43
  44         if (!strcmp(arch, "x86")) {
  45                 if (dso_type != DSO__TYPE_64BIT)
  46                         ops = x86_32_unwind_libunwind_ops;
  47         } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
  48                 if (dso_type == DSO__TYPE_64BIT)
  49                         ops = arm64_unwind_libunwind_ops;
  50         }
  51
  52         if (!ops) {
  53                 pr_err("unwind: target platform=%s is not supported\n", arch);
  54                 return 0;
  55         }
  56 out_register:
  57         unwind__register_ops(thread, ops);
  58
  59         err = thread->unwind_libunwind_ops->prepare_access(thread);
  60         if (initialized)
  61                 *initialized = err ? false : true;
  62         return err;
  63 }
  64
  65 void unwind__flush_access(struct thread *thread)
  66 {
  67         if (thread->unwind_libunwind_ops)
  68                 thread->unwind_libunwind_ops->flush_access(thread);
  69 }
  70
  71 void unwind__finish_access(struct thread *thread)
  72 {
  73         if (thread->unwind_libunwind_ops)
  74                 thread->unwind_libunwind_ops->finish_access(thread);
  75 }
  76
  77 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
  78                          struct thread *thread,
  79                          struct perf_sample *data, int max_stack)
  80 {
  81         if (thread->unwind_libunwind_ops)
  82                 return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
  83         return 0;
  84 }