LXR linux/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
   7struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
   8struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
   9struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
  10
  11static void unwind__register_ops(struct thread *thread,
  12                          struct unwind_libunwind_ops *ops)
  13{
  14        thread->unwind_libunwind_ops = ops;
  15}
  16
  17int unwind__prepare_access(struct thread *thread, struct map *map,
  18                           bool *initialized)
  19{
  20        const char *arch;
  21        enum dso_type dso_type;
  22        struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
  23        int err;
  24
  25        if (thread->addr_space) {
  26                pr_debug("unwind: thread map already set, dso=%s\n",
  27                         map->dso->name);
  28                if (initialized)
  29                        *initialized = true;
  30                return 0;
  31        }
  32
  33        /* env->arch is NULL for live-mode (i.e. perf top) */
  34        if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
  35                goto out_register;
  36
  37        dso_type = dso__type(map->dso, thread->mg->machine);
  38        if (dso_type == DSO__TYPE_UNKNOWN)
  39                return 0;
  40
  41        arch = normalize_arch(thread->mg->machine->env->arch);
  42
  43        if (!strcmp(arch, "x86")) {
  44                if (dso_type != DSO__TYPE_64BIT)
  45                        ops = x86_32_unwind_libunwind_ops;
  46        } else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
  47                if (dso_type == DSO__TYPE_64BIT)
  48                        ops = arm64_unwind_libunwind_ops;
  49        }
  50
  51        if (!ops) {
  52                pr_err("unwind: target platform=%s is not supported\n", arch);
  53                return -1;
  54        }
  55out_register:
  56        unwind__register_ops(thread, ops);
  57
  58        err = thread->unwind_libunwind_ops->prepare_access(thread);
  59        if (initialized)
  60                *initialized = err ? false : true;
  61        return err;
  62}
  63
  64void unwind__flush_access(struct thread *thread)
  65{
  66        if (thread->unwind_libunwind_ops)
  67                thread->unwind_libunwind_ops->flush_access(thread);
  68}
  69
  70void unwind__finish_access(struct thread *thread)
  71{
  72        if (thread->unwind_libunwind_ops)
  73                thread->unwind_libunwind_ops->finish_access(thread);
  74}
  75
  76int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
  77                         struct thread *thread,
  78                         struct perf_sample *data, int max_stack)
  79{
  80        if (thread->unwind_libunwind_ops)
  81                return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
  82        return 0;
  83}
  84