/* SPDX-License-Identifier: GPL-2.0 *//* * External livepatch interfaces for patch creation tooling */ #ifndef _LINUX_LIVEPATCH_EXTERNAL_H_#define _LINUX_LIVEPATCH_EXTERNAL_H_ #include <linux/types.h> #define KLP_RELOC_SEC_PREFIX		".klp.rela."#define KLP_SYM_PREFIX			".klp.sym." #define __KLP_PRE_PATCH_PREFIX		__klp_pre_patch_callback_#define __KLP_POST_PATCH_PREFIX		__klp_post_patch_callback_#define __KLP_PRE_UNPATCH_PREFIX	__klp_pre_unpatch_callback_#define __KLP_POST_UNPATCH_PREFIX	__klp_post_unpatch_callback_ #define KLP_PRE_PATCH_PREFIX		__stringify(__KLP_PRE_PATCH_PREFIX)#define KLP_POST_PATCH_PREFIX		__stringify(__KLP_POST_PATCH_PREFIX)#define KLP_PRE_UNPATCH_PREFIX		__stringify(__KLP_PRE_UNPATCH_PREFIX)#define KLP_POST_UNPATCH_PREFIX		__stringify(__KLP_POST_UNPATCH_PREFIX) struct klp_object; typedef int (*klp_pre_patch_t)(struct klp_object *obj);typedef void (*klp_post_patch_t)(struct klp_object *obj);typedef void (*klp_pre_unpatch_t)(struct klp_object *obj);typedef void (*klp_post_unpatch_t)(struct klp_object *obj); /** * struct klp_callbacks - pre/post live-(un)patch callback structure * @pre_patch:		executed before code patching * @post_patch:		executed after code patching * @pre_unpatch:	executed before code unpatching * @post_unpatch:	executed after code unpatching * @post_unpatch_enabled:	flag indicating if post-unpatch callback *				should run * * All callbacks are optional.  Only the pre-patch callback, if provided, * will be unconditionally executed.  If the parent klp_object fails to * patch for any reason, including a non-zero error status returned from * the pre-patch callback, no further callbacks will be executed. */struct klp_callbacks {	klp_pre_patch_t		pre_patch;	klp_post_patch_t	post_patch;	klp_pre_unpatch_t	pre_unpatch;	klp_post_unpatch_t	post_unpatch;	bool post_unpatch_enabled;}; /* * 'struct klp_{func,object}_ext' are compact "external" representations of * 'struct klp_{func,object}'.   They are used by objtool for livepatch * generation.  The structs are then read by the livepatch module and converted * to the real structs before calling klp_enable_patch(). * * TODO make these the official API for klp_enable_patch().  That should * simplify livepatch's interface as well as its data structure lifetime * management. */struct klp_func_ext {	const char *old_name;	void *new_func;	unsigned long sympos;}; struct klp_object_ext {	const char *name;	struct klp_func_ext *funcs;	struct klp_callbacks callbacks;	unsigned int nr_funcs;}; #endif /* _LINUX_LIVEPATCH_EXTERNAL_H_ */