5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_INDIRECT_CALL_WRAPPER_H
|
|
#define _LINUX_INDIRECT_CALL_WRAPPER_H
|
|
|
|
#ifdef CONFIG_RETPOLINE
|
|
|
|
/*
|
|
* INDIRECT_CALL_$NR - wrapper for indirect calls with $NR known builtin
|
|
* @f: function pointer
|
|
* @f$NR: builtin functions names, up to $NR of them
|
|
* @__VA_ARGS__: arguments for @f
|
|
*
|
|
* Avoid retpoline overhead for known builtin, checking @f vs each of them and
|
|
* eventually invoking directly the builtin function. The functions are check
|
|
* in the given order. Fallback to the indirect call.
|
|
*/
|
|
#define INDIRECT_CALL_1(f, f1, ...) \
|
|
({ \
|
|
likely(f == f1) ? f1(__VA_ARGS__) : f(__VA_ARGS__); \
|
|
})
|
|
#define INDIRECT_CALL_2(f, f2, f1, ...) \
|
|
({ \
|
|
likely(f == f2) ? f2(__VA_ARGS__) : \
|
|
INDIRECT_CALL_1(f, f1, __VA_ARGS__); \
|
|
})
|
|
#define INDIRECT_CALL_3(f, f3, f2, f1, ...) \
|
|
({ \
|
|
likely(f == f3) ? f3(__VA_ARGS__) : \
|
|
INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__); \
|
|
})
|
|
#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) \
|
|
({ \
|
|
likely(f == f4) ? f4(__VA_ARGS__) : \
|
|
INDIRECT_CALL_3(f, f3, f2, f1, __VA_ARGS__); \
|
|
})
|
|
|
|
#define INDIRECT_CALLABLE_DECLARE(f) f
|
|
#define INDIRECT_CALLABLE_SCOPE
|
|
|
|
#else
|
|
#define INDIRECT_CALL_1(f, f1, ...) f(__VA_ARGS__)
|
|
#define INDIRECT_CALL_2(f, f2, f1, ...) f(__VA_ARGS__)
|
|
#define INDIRECT_CALL_3(f, f3, f2, f1, ...) f(__VA_ARGS__)
|
|
#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) f(__VA_ARGS__)
|
|
#define INDIRECT_CALLABLE_DECLARE(f)
|
|
#define INDIRECT_CALLABLE_SCOPE static
|
|
#endif
|
|
|
|
/*
|
|
* We can use INDIRECT_CALL_$NR for ipv6 related functions only if ipv6 is
|
|
* builtin, this macro simplify dealing with indirect calls with only ipv4/ipv6
|
|
* alternatives
|
|
*/
|
|
#if IS_BUILTIN(CONFIG_IPV6)
|
|
#define INDIRECT_CALL_INET(f, f2, f1, ...) \
|
|
INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__)
|
|
#elif IS_ENABLED(CONFIG_INET)
|
|
#define INDIRECT_CALL_INET(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
|
|
#else
|
|
#define INDIRECT_CALL_INET(f, f2, f1, ...) f(__VA_ARGS__)
|
|
#endif
|
|
|
|
#endif
|