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