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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
unwind__prepare_access(struct maps * maps __maybe_unused,struct map * map __maybe_unused,bool * initialized __maybe_unused)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 
unwind__flush_access(struct maps * maps __maybe_unused)59 static inline void unwind__flush_access(struct maps *maps __maybe_unused) {}
unwind__finish_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
unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,void * arg __maybe_unused,struct thread * thread __maybe_unused,struct perf_sample * data __maybe_unused,int max_stack __maybe_unused)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 
unwind__prepare_access(struct maps * maps __maybe_unused,struct map * map __maybe_unused,bool * initialized __maybe_unused)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 
unwind__flush_access(struct maps * maps __maybe_unused)80 static inline void unwind__flush_access(struct maps *maps __maybe_unused) {}
unwind__finish_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 */
84