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71 lines
2.2 KiB
71 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_INDIRECT_CALL_WRAPPER_H |
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#define _LINUX_INDIRECT_CALL_WRAPPER_H |
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#ifdef CONFIG_RETPOLINE |
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/* |
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* INDIRECT_CALL_$NR - wrapper for indirect calls with $NR known builtin |
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* @f: function pointer |
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* @f$NR: builtin functions names, up to $NR of them |
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* @__VA_ARGS__: arguments for @f |
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* |
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* Avoid retpoline overhead for known builtin, checking @f vs each of them and |
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* eventually invoking directly the builtin function. The functions are check |
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* in the given order. Fallback to the indirect call. |
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*/ |
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#define INDIRECT_CALL_1(f, f1, ...) \ |
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({ \ |
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likely(f == f1) ? f1(__VA_ARGS__) : f(__VA_ARGS__); \ |
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}) |
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#define INDIRECT_CALL_2(f, f2, f1, ...) \ |
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({ \ |
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likely(f == f2) ? f2(__VA_ARGS__) : \ |
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INDIRECT_CALL_1(f, f1, __VA_ARGS__); \ |
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}) |
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#define INDIRECT_CALL_3(f, f3, f2, f1, ...) \ |
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({ \ |
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likely(f == f3) ? f3(__VA_ARGS__) : \ |
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INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__); \ |
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}) |
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#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) \ |
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({ \ |
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likely(f == f4) ? f4(__VA_ARGS__) : \ |
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INDIRECT_CALL_3(f, f3, f2, f1, __VA_ARGS__); \ |
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}) |
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#define INDIRECT_CALLABLE_DECLARE(f) f |
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#define INDIRECT_CALLABLE_SCOPE |
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#define EXPORT_INDIRECT_CALLABLE(f) EXPORT_SYMBOL(f) |
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#else |
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#define INDIRECT_CALL_1(f, f1, ...) f(__VA_ARGS__) |
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#define INDIRECT_CALL_2(f, f2, f1, ...) f(__VA_ARGS__) |
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#define INDIRECT_CALL_3(f, f3, f2, f1, ...) f(__VA_ARGS__) |
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#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) f(__VA_ARGS__) |
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#define INDIRECT_CALLABLE_DECLARE(f) |
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#define INDIRECT_CALLABLE_SCOPE static |
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#define EXPORT_INDIRECT_CALLABLE(f) |
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#endif |
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/* |
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* We can use INDIRECT_CALL_$NR for ipv6 related functions only if ipv6 is |
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* builtin, this macro simplify dealing with indirect calls with only ipv4/ipv6 |
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* alternatives |
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*/ |
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#if IS_BUILTIN(CONFIG_IPV6) |
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#define INDIRECT_CALL_INET(f, f2, f1, ...) \ |
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INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__) |
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#elif IS_ENABLED(CONFIG_INET) |
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#define INDIRECT_CALL_INET(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__) |
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#else |
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#define INDIRECT_CALL_INET(f, f2, f1, ...) f(__VA_ARGS__) |
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#endif |
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#if IS_ENABLED(CONFIG_INET) |
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#define INDIRECT_CALL_INET_1(f, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__) |
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#else |
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#define INDIRECT_CALL_INET_1(f, f1, ...) f(__VA_ARGS__) |
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#endif |
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#endif
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