1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Profiling infrastructure declarations. 4 * 5 * This file is based on gcc-internal definitions. Data structures are 6 * defined to be compatible with gcc counterparts. For a better 7 * understanding, refer to gcc source: gcc/gcov-io.h. 8 * 9 * Copyright IBM Corp. 2009 10 * Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com> 11 * 12 * Uses gcc-internal data definitions. 13 */ 14 15 #ifndef GCOV_H 16 #define GCOV_H GCOV_H 17 18 #include <linux/module.h> 19 #include <linux/types.h> 20 21 /* 22 * Profiling data types used for gcc 3.4 and above - these are defined by 23 * gcc and need to be kept as close to the original definition as possible to 24 * remain compatible. 25 */ 26 #define GCOV_DATA_MAGIC ((unsigned int) 0x67636461) 27 #define GCOV_TAG_FUNCTION ((unsigned int) 0x01000000) 28 #define GCOV_TAG_COUNTER_BASE ((unsigned int) 0x01a10000) 29 #define GCOV_TAG_FOR_COUNTER(count) \ 30 (GCOV_TAG_COUNTER_BASE + ((unsigned int) (count) << 17)) 31 32 #if BITS_PER_LONG >= 64 33 typedef long gcov_type; 34 #else 35 typedef long long gcov_type; 36 #endif 37 38 /* Opaque gcov_info. The gcov structures can change as for example in gcc 4.7 so 39 * we cannot use full definition here and they need to be placed in gcc specific 40 * implementation of gcov. This also means no direct access to the members in 41 * generic code and usage of the interface below.*/ 42 struct gcov_info; 43 44 /* Interface to access gcov_info data */ 45 const char *gcov_info_filename(struct gcov_info *info); 46 unsigned int gcov_info_version(struct gcov_info *info); 47 struct gcov_info *gcov_info_next(struct gcov_info *info); 48 void gcov_info_link(struct gcov_info *info); 49 void gcov_info_unlink(struct gcov_info *prev, struct gcov_info *info); 50 bool gcov_info_within_module(struct gcov_info *info, struct module *mod); 51 size_t convert_to_gcda(char *buffer, struct gcov_info *info); 52 53 /* Base interface. */ 54 enum gcov_action { 55 GCOV_ADD, 56 GCOV_REMOVE, 57 }; 58 59 void gcov_event(enum gcov_action action, struct gcov_info *info); 60 void gcov_enable_events(void); 61 62 /* writing helpers */ 63 size_t store_gcov_u32(void *buffer, size_t off, u32 v); 64 size_t store_gcov_u64(void *buffer, size_t off, u64 v); 65 66 /* gcov_info control. */ 67 void gcov_info_reset(struct gcov_info *info); 68 int gcov_info_is_compatible(struct gcov_info *info1, struct gcov_info *info2); 69 void gcov_info_add(struct gcov_info *dest, struct gcov_info *source); 70 struct gcov_info *gcov_info_dup(struct gcov_info *info); 71 void gcov_info_free(struct gcov_info *info); 72 73 struct gcov_link { 74 enum { 75 OBJ_TREE, 76 SRC_TREE, 77 } dir; 78 const char *ext; 79 }; 80 extern const struct gcov_link gcov_link[]; 81 82 extern int gcov_events_enabled; 83 extern struct mutex gcov_lock; 84 85 #endif /* GCOV_H */ 86