LXR linux/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 "env.h"
   7
   8struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
   9struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
  10struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
  11
  12static void unwind__register_ops(struct thread *thread,
  13                          struct unwind_libunwind_ops *ops)
  14{
  15        thread->unwind_libunwind_ops = ops;
  16}
  17
  18int 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 = perf_env__arch(thread->mg->machine->env);
  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        }
  56out_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
  65void unwind__flush_access(struct thread *thread)
  66{
  67        if (thread->unwind_libunwind_ops)
  68                thread->unwind_libunwind_ops->flush_access(thread);
  69}
  70
  71void unwind__finish_access(struct thread *thread)
  72{
  73        if (thread->unwind_libunwind_ops)
  74                thread->unwind_libunwind_ops->finish_access(thread);
  75}
  76
  77int 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}
  85