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