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/* 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_ */
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