tools/perf/util/unwind-libunwind.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "unwind.h"
   3 #include "dso.h"
   4 #include "map.h"
   5 #include "thread.h"
   6 #include "session.h"
   7 #include "debug.h"
   8 #include "env.h"
   9 #include "callchain.h"
  10
  11 struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
  12 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
  13 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
  14
  15 int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized)
  16 {
  17         const char *arch;
  18         enum dso_type dso_type;
  19         struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
  20         struct dso *dso = map__dso(map);
  21         struct machine *machine;
  22         int err;
  23
  24         if (!dwarf_callchain_users)
  25                 return 0;
  26
  27         if (maps__addr_space(maps)) {
  28                 pr_debug("unwind: thread map already set, dso=%s\n", dso__name(dso));
  29                 if (initialized)
  30                         *initialized = true;
  31                 return 0;
  32         }
  33
  34         machine = maps__machine(maps);
  35         /* env->arch is NULL for live-mode (i.e. perf top) */
  36         if (!machine->env || !machine->env->arch)
  37                 goto out_register;
  38
  39         dso_type = dso__type(dso, machine);
  40         if (dso_type == DSO__TYPE_UNKNOWN)
  41                 return 0;
  42
  43         arch = perf_env__arch(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_warning_once("unwind: target platform=%s is not supported\n", arch);
  55                 return 0;
  56         }
  57 out_register:
  58         maps__set_unwind_libunwind_ops(maps, ops);
  59
  60         err = maps__unwind_libunwind_ops(maps)->prepare_access(maps);
  61         if (initialized)
  62                 *initialized = err ? false : true;
  63         return err;
  64 }
  65
  66 void unwind__flush_access(struct maps *maps)
  67 {
  68         const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps);
  69
  70         if (ops)
  71                 ops->flush_access(maps);
  72 }
  73
  74 void unwind__finish_access(struct maps *maps)
  75 {
  76         const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps);
  77
  78         if (ops)
  79                 ops->finish_access(maps);
  80 }
  81
  82 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
  83                          struct thread *thread,
  84                          struct perf_sample *data, int max_stack,
  85                          bool best_effort)
  86 {
  87         const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(thread__maps(thread));
  88
  89         if (ops)
  90                 return ops->get_entries(cb, arg, thread, data, max_stack, best_effort);
  91         return 0;
  92 }