LXR linux/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
  11struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
  12struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
  13struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
  14
  15static void unwind__register_ops(struct maps *maps, struct unwind_libunwind_ops *ops)
  16{
  17        maps->unwind_libunwind_ops = ops;
  18}
  19
  20int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized)
  21{
  22        const char *arch;
  23        enum dso_type dso_type;
  24        struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
  25        int err;
  26
  27        if (!dwarf_callchain_users)
  28                return 0;
  29
  30        if (maps->addr_space) {
  31                pr_debug("unwind: thread map already set, dso=%s\n",
  32                         map->dso->name);
  33                if (initialized)
  34                        *initialized = true;
  35                return 0;
  36        }
  37
  38        /* env->arch is NULL for live-mode (i.e. perf top) */
  39        if (!maps->machine->env || !maps->machine->env->arch)
  40                goto out_register;
  41
  42        dso_type = dso__type(map->dso, maps->machine);
  43        if (dso_type == DSO__TYPE_UNKNOWN)
  44                return 0;
  45
  46        arch = perf_env__arch(maps->machine->env);
  47
  48        if (!strcmp(arch, "x86")) {
  49                if (dso_type != DSO__TYPE_64BIT)
  50                        ops = x86_32_unwind_libunwind_ops;
  51        } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
  52                if (dso_type == DSO__TYPE_64BIT)
  53                        ops = arm64_unwind_libunwind_ops;
  54        }
  55
  56        if (!ops) {
  57                pr_err("unwind: target platform=%s is not supported\n", arch);
  58                return 0;
  59        }
  60out_register:
  61        unwind__register_ops(maps, ops);
  62
  63        err = maps->unwind_libunwind_ops->prepare_access(maps);
  64        if (initialized)
  65                *initialized = err ? false : true;
  66        return err;
  67}
  68
  69void unwind__flush_access(struct maps *maps)
  70{
  71        if (maps->unwind_libunwind_ops)
  72                maps->unwind_libunwind_ops->flush_access(maps);
  73}
  74
  75void unwind__finish_access(struct maps *maps)
  76{
  77        if (maps->unwind_libunwind_ops)
  78                maps->unwind_libunwind_ops->finish_access(maps);
  79}
  80
  81int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
  82                         struct thread *thread,
  83                         struct perf_sample *data, int max_stack)
  84{
  85        if (thread->maps->unwind_libunwind_ops)
  86                return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
  87        return 0;
  88}
  89