tools/perf/util/unwind.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __UNWIND_H
   3 #define __UNWIND_H
   4
   5 #include <linux/compiler.h>
   6 #include <linux/types.h>
   7
   8 struct map;
   9 struct perf_sample;
  10 struct symbol;
  11 struct thread;
  12
  13 struct unwind_entry {
  14         struct map      *map;
  15         struct symbol   *sym;
  16         u64             ip;
  17 };
  18
  19 typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
  20
  21 struct unwind_libunwind_ops {
  22         int (*prepare_access)(struct thread *thread);
  23         void (*flush_access)(struct thread *thread);
  24         void (*finish_access)(struct thread *thread);
  25         int (*get_entries)(unwind_entry_cb_t cb, void *arg,
  26                            struct thread *thread,
  27                            struct perf_sample *data, int max_stack);
  28 };
  29
  30 #ifdef HAVE_DWARF_UNWIND_SUPPORT
  31 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
  32                         struct thread *thread,
  33                         struct perf_sample *data, int max_stack);
  34 /* libunwind specific */
  35 #ifdef HAVE_LIBUNWIND_SUPPORT
  36 #ifndef LIBUNWIND__ARCH_REG_ID
  37 #define LIBUNWIND__ARCH_REG_ID(regnum) libunwind__arch_reg_id(regnum)
  38 #endif
  39
  40 #ifndef LIBUNWIND__ARCH_REG_SP
  41 #define LIBUNWIND__ARCH_REG_SP PERF_REG_SP
  42 #endif
  43
  44 #ifndef LIBUNWIND__ARCH_REG_IP
  45 #define LIBUNWIND__ARCH_REG_IP PERF_REG_IP
  46 #endif
  47
  48 int LIBUNWIND__ARCH_REG_ID(int regnum);
  49 int unwind__prepare_access(struct thread *thread, struct map *map,
  50                            bool *initialized);
  51 void unwind__flush_access(struct thread *thread);
  52 void unwind__finish_access(struct thread *thread);
  53 #else
  54 static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
  55                                          struct map *map __maybe_unused,
  56                                          bool *initialized __maybe_unused)
  57 {
  58         return 0;
  59 }
  60
  61 static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
  62 static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
  63 #endif
  64 #else
  65 static inline int
  66 unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
  67                     void *arg __maybe_unused,
  68                     struct thread *thread __maybe_unused,
  69                     struct perf_sample *data __maybe_unused,
  70                     int max_stack __maybe_unused)
  71 {
  72         return 0;
  73 }
  74
  75 static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
  76                                          struct map *map __maybe_unused,
  77                                          bool *initialized __maybe_unused)
  78 {
  79         return 0;
  80 }
  81
  82 static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
  83 static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
  84 #endif /* HAVE_DWARF_UNWIND_SUPPORT */
  85 #endif /* __UNWIND_H */