| 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, bool best_effort); |
| 27 | }; |
| 28 | |
| 29 | #ifdef HAVE_DWARF_UNWIND_SUPPORT |
| 30 | /* |
| 31 | * When best_effort is set, don't report errors and fail silently. This could |
| 32 | * be expanded in the future to be more permissive about things other than |
| 33 | * error messages. |
| 34 | */ |
| 35 | int unwind__get_entries(unwind_entry_cb_t cb, void *arg, |
| 36 | struct thread *thread, |
| 37 | struct perf_sample *data, int max_stack, |
| 38 | bool best_effort); |
| 39 | /* libunwind specific */ |
| 40 | #ifdef HAVE_LIBUNWIND_SUPPORT |
| 41 | #ifndef LIBUNWIND__ARCH_REG_ID |
| 42 | #define LIBUNWIND__ARCH_REG_ID(regnum) libunwind__arch_reg_id(regnum) |
| 43 | #endif |
| 44 | |
| 45 | int LIBUNWIND__ARCH_REG_ID(int regnum); |
| 46 | int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized); |
| 47 | void unwind__flush_access(struct maps *maps); |
| 48 | void unwind__finish_access(struct maps *maps); |
| 49 | #else |
| 50 | static inline int unwind__prepare_access(struct maps *maps __maybe_unused, |
| 51 | struct map *map __maybe_unused, |
| 52 | bool *initialized __maybe_unused) |
| 53 | { |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | static inline void unwind__flush_access(struct maps *maps __maybe_unused) {} |
| 58 | static inline void unwind__finish_access(struct maps *maps __maybe_unused) {} |
| 59 | #endif |
| 60 | #else |
| 61 | static inline int |
| 62 | unwind__get_entries(unwind_entry_cb_t cb __maybe_unused, |
| 63 | void *arg __maybe_unused, |
| 64 | struct thread *thread __maybe_unused, |
| 65 | struct perf_sample *data __maybe_unused, |
| 66 | int max_stack __maybe_unused, |
| 67 | bool best_effort __maybe_unused) |
| 68 | { |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static inline int unwind__prepare_access(struct maps *maps __maybe_unused, |
| 73 | struct map *map __maybe_unused, |
| 74 | bool *initialized __maybe_unused) |
| 75 | { |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static inline void unwind__flush_access(struct maps *maps __maybe_unused) {} |
| 80 | static inline void unwind__finish_access(struct maps *maps __maybe_unused) {} |
| 81 | #endif /* HAVE_DWARF_UNWIND_SUPPORT */ |
| 82 | #endif /* __UNWIND_H */ |