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/* SPDX-License-Identifier: GPL-2.0 */
/*
* code tagging framework
*/
#ifndef _LINUX_CODETAG_H
#define _LINUX_CODETAG_H
#include <linux/types.h>
struct codetag_iterator;
struct codetag_type;
struct codetag_module;
struct seq_buf;
struct module;
#define CODETAG_SECTION_START_PREFIX "__start_"
#define CODETAG_SECTION_STOP_PREFIX "__stop_"
/*
* An instance of this structure is created in a special ELF section at every
* code location being tagged. At runtime, the special section is treated as
* an array of these.
*/
struct codetag {
unsigned int flags; /* used in later patches */
unsigned int lineno;
const char *modname;
const char *function;
const char *filename;
} __aligned(8);
union codetag_ref {
struct codetag *ct;
};
struct codetag_type_desc {
const char *section;
size_t tag_size;
void (*module_load)(struct codetag_type *cttype,
struct codetag_module *cmod);
void (*module_unload)(struct codetag_type *cttype,
struct codetag_module *cmod);
#ifdef CONFIG_MODULES
void (*module_replaced)(struct module *mod, struct module *new_mod);
bool (*needs_section_mem)(struct module *mod, unsigned long size);
void *(*alloc_section_mem)(struct module *mod, unsigned long size,
unsigned int prepend, unsigned long align);
void (*free_section_mem)(struct module *mod, bool used);
#endif
};
struct codetag_iterator {
struct codetag_type *cttype;
struct codetag_module *cmod;
unsigned long mod_id;
struct codetag *ct;
};
#ifdef MODULE
#define CT_MODULE_NAME KBUILD_MODNAME
#else
#define CT_MODULE_NAME NULL
#endif
#define CODE_TAG_INIT { \
.modname = CT_MODULE_NAME, \
.function = __func__, \
.filename = __FILE__, \
.lineno = __LINE__, \
.flags = 0, \
}
void codetag_lock_module_list(struct codetag_type *cttype, bool lock);
bool codetag_trylock_module_list(struct codetag_type *cttype);
struct codetag_iterator codetag_get_ct_iter(struct codetag_type *cttype);
struct codetag *codetag_next_ct(struct codetag_iterator *iter);
void codetag_to_text(struct seq_buf *out, struct codetag *ct);
struct codetag_type *
codetag_register_type(const struct codetag_type_desc *desc);
#if defined(CONFIG_CODE_TAGGING) && defined(CONFIG_MODULES)
bool codetag_needs_module_section(struct module *mod, const char *name,
unsigned long size);
void *codetag_alloc_module_section(struct module *mod, const char *name,
unsigned long size, unsigned int prepend,
unsigned long align);
void codetag_free_module_sections(struct module *mod);
void codetag_module_replaced(struct module *mod, struct module *new_mod);
void codetag_load_module(struct module *mod);
void codetag_unload_module(struct module *mod);
#else /* defined(CONFIG_CODE_TAGGING) && defined(CONFIG_MODULES) */
static inline bool
codetag_needs_module_section(struct module *mod, const char *name,
unsigned long size) { return false; }
static inline void *
codetag_alloc_module_section(struct module *mod, const char *name,
unsigned long size, unsigned int prepend,
unsigned long align) { return NULL; }
static inline void codetag_free_module_sections(struct module *mod) {}
static inline void codetag_module_replaced(struct module *mod, struct module *new_mod) {}
static inline void codetag_load_module(struct module *mod) {}
static inline void codetag_unload_module(struct module *mod) {}
#endif /* defined(CONFIG_CODE_TAGGING) && defined(CONFIG_MODULES) */
#endif /* _LINUX_CODETAG_H */
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