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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _STATIC_CALL_TYPES_H
#define _STATIC_CALL_TYPES_H
#include <linux/types.h>
#include <linux/stringify.h>
#include <linux/compiler.h>
#define STATIC_CALL_KEY_PREFIX __SCK__
#define STATIC_CALL_KEY_PREFIX_STR __stringify(STATIC_CALL_KEY_PREFIX)
#define STATIC_CALL_KEY_PREFIX_LEN (sizeof(STATIC_CALL_KEY_PREFIX_STR) - 1)
#define STATIC_CALL_KEY(name) __PASTE(STATIC_CALL_KEY_PREFIX, name)
#define STATIC_CALL_TRAMP_PREFIX __SCT__
#define STATIC_CALL_TRAMP_PREFIX_STR __stringify(STATIC_CALL_TRAMP_PREFIX)
#define STATIC_CALL_TRAMP_PREFIX_LEN (sizeof(STATIC_CALL_TRAMP_PREFIX_STR) - 1)
#define STATIC_CALL_TRAMP(name) __PASTE(STATIC_CALL_TRAMP_PREFIX, name)
#define STATIC_CALL_TRAMP_STR(name) __stringify(STATIC_CALL_TRAMP(name))
/*
* Flags in the low bits of static_call_site::key.
*/
#define STATIC_CALL_SITE_TAIL 1UL /* tail call */
#define STATIC_CALL_SITE_INIT 2UL /* init section */
#define STATIC_CALL_SITE_FLAGS 3UL
/*
* The static call site table needs to be created by external tooling (objtool
* or a compiler plugin).
*/
struct static_call_site {
s32 addr;
s32 key;
};
#define DECLARE_STATIC_CALL(name, func) \
extern struct static_call_key STATIC_CALL_KEY(name); \
extern typeof(func) STATIC_CALL_TRAMP(name);
#ifdef CONFIG_HAVE_STATIC_CALL
/*
* __ADDRESSABLE() is used to ensure the key symbol doesn't get stripped from
* the symbol table so that objtool can reference it when it generates the
* .static_call_sites section.
*/
#define __static_call(name) \
({ \
__ADDRESSABLE(STATIC_CALL_KEY(name)); \
&STATIC_CALL_TRAMP(name); \
})
#define static_call(name) __static_call(name)
#else
#define static_call(name) \
((typeof(STATIC_CALL_TRAMP(name))*)(STATIC_CALL_KEY(name).func))
#endif /* CONFIG_HAVE_STATIC_CALL */
#endif /* _STATIC_CALL_TYPES_H */
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