tools/perf/util/unwind-libunwind.c

   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 }