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