cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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libbpf_common.h (3041B)

      1/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
      2
      3/*
      4 * Common user-facing libbpf helpers.
      5 *
      6 * Copyright (c) 2019 Facebook
      7 */
      8
      9#ifndef __LIBBPF_LIBBPF_COMMON_H
     10#define __LIBBPF_LIBBPF_COMMON_H
     11
     12#include <string.h>
     13#include "libbpf_version.h"
     14
     15#ifndef LIBBPF_API
     16#define LIBBPF_API __attribute__((visibility("default")))
     17#endif
     18
     19#define LIBBPF_DEPRECATED(msg) __attribute__((deprecated(msg)))
     20
     21/* Mark a symbol as deprecated when libbpf version is >= {major}.{minor} */
     22#define LIBBPF_DEPRECATED_SINCE(major, minor, msg)			    \
     23	__LIBBPF_MARK_DEPRECATED_ ## major ## _ ## minor		    \
     24		(LIBBPF_DEPRECATED("libbpf v" # major "." # minor "+: " msg))
     25
     26#define __LIBBPF_CURRENT_VERSION_GEQ(major, minor)			    \
     27	(LIBBPF_MAJOR_VERSION > (major) ||				    \
     28	 (LIBBPF_MAJOR_VERSION == (major) && LIBBPF_MINOR_VERSION >= (minor)))
     29
     30/* Add checks for other versions below when planning deprecation of API symbols
     31 * with the LIBBPF_DEPRECATED_SINCE macro.
     32 */
     33#if __LIBBPF_CURRENT_VERSION_GEQ(0, 6)
     34#define __LIBBPF_MARK_DEPRECATED_0_6(X) X
     35#else
     36#define __LIBBPF_MARK_DEPRECATED_0_6(X)
     37#endif
     38#if __LIBBPF_CURRENT_VERSION_GEQ(0, 7)
     39#define __LIBBPF_MARK_DEPRECATED_0_7(X) X
     40#else
     41#define __LIBBPF_MARK_DEPRECATED_0_7(X)
     42#endif
     43#if __LIBBPF_CURRENT_VERSION_GEQ(0, 8)
     44#define __LIBBPF_MARK_DEPRECATED_0_8(X) X
     45#else
     46#define __LIBBPF_MARK_DEPRECATED_0_8(X)
     47#endif
     48
     49/* This set of internal macros allows to do "function overloading" based on
     50 * number of arguments provided by used in backwards-compatible way during the
     51 * transition to libbpf 1.0
     52 * It's ugly but necessary evil that will be cleaned up when we get to 1.0.
     53 * See bpf_prog_load() overload for example.
     54 */
     55#define ___libbpf_cat(A, B) A ## B
     56#define ___libbpf_select(NAME, NUM) ___libbpf_cat(NAME, NUM)
     57#define ___libbpf_nth(_1, _2, _3, _4, _5, _6, N, ...) N
     58#define ___libbpf_cnt(...) ___libbpf_nth(__VA_ARGS__, 6, 5, 4, 3, 2, 1)
     59#define ___libbpf_overload(NAME, ...) ___libbpf_select(NAME, ___libbpf_cnt(__VA_ARGS__))(__VA_ARGS__)
     60
     61/* Helper macro to declare and initialize libbpf options struct
     62 *
     63 * This dance with uninitialized declaration, followed by memset to zero,
     64 * followed by assignment using compound literal syntax is done to preserve
     65 * ability to use a nice struct field initialization syntax and **hopefully**
     66 * have all the padding bytes initialized to zero. It's not guaranteed though,
     67 * when copying literal, that compiler won't copy garbage in literal's padding
     68 * bytes, but that's the best way I've found and it seems to work in practice.
     69 *
     70 * Macro declares opts struct of given type and name, zero-initializes,
     71 * including any extra padding, it with memset() and then assigns initial
     72 * values provided by users in struct initializer-syntax as varargs.
     73 */
     74#define LIBBPF_OPTS(TYPE, NAME, ...)					    \
     75	struct TYPE NAME = ({ 						    \
     76		memset(&NAME, 0, sizeof(struct TYPE));			    \
     77		(struct TYPE) {						    \
     78			.sz = sizeof(struct TYPE),			    \
     79			__VA_ARGS__					    \
     80		};							    \
     81	})
     82
     83#endif /* __LIBBPF_LIBBPF_COMMON_H */