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 #ifndef LIBUNWIND__ARCH_REG_SP 46 #define LIBUNWIND__ARCH_REG_SP PERF_REG_SP 47 #endif 48 49 #ifndef LIBUNWIND__ARCH_REG_IP 50 #define LIBUNWIND__ARCH_REG_IP PERF_REG_IP 51 #endif 52 53 int LIBUNWIND__ARCH_REG_ID(int regnum); 54 int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized); 55 void unwind__flush_access(struct maps *maps); 56 void unwind__finish_access(struct maps *maps); 57 #else 58 static inline int unwind__prepare_access(struct maps *maps __maybe_unused, 59 struct map *map __maybe_unused, 60 bool *initialized __maybe_unused) 61 { 62 return 0; 63 } 64 65 static inline void unwind__flush_access(struct maps *maps __maybe_unused) {} 66 static inline void unwind__finish_access(struct maps *maps __maybe_unused) {} 67 #endif 68 #else 69 static inline int 70 unwind__get_entries(unwind_entry_cb_t cb __maybe_unused, 71 void *arg __maybe_unused, 72 struct thread *thread __maybe_unused, 73 struct perf_sample *data __maybe_unused, 74 int max_stack __maybe_unused, 75 bool best_effort __maybe_unused) 76 { 77 return 0; 78 } 79 80 static inline int unwind__prepare_access(struct maps *maps __maybe_unused, 81 struct map *map __maybe_unused, 82 bool *initialized __maybe_unused) 83 { 84 return 0; 85 } 86 87 static inline void unwind__flush_access(struct maps *maps __maybe_unused) {} 88 static inline void unwind__finish_access(struct maps *maps __maybe_unused) {} 89 #endif /* HAVE_DWARF_UNWIND_SUPPORT */ 90 #endif /* __UNWIND_H */ 91