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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bpf-utils.h (2136B)

      1/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
      2
      3#ifndef __PERF_BPF_UTILS_H
      4#define __PERF_BPF_UTILS_H
      5
      6#define ptr_to_u64(ptr)    ((__u64)(unsigned long)(ptr))
      7
      8#ifdef HAVE_LIBBPF_SUPPORT
      9
     10#include <bpf/libbpf.h>
     11
     12/*
     13 * Get bpf_prog_info in continuous memory
     14 *
     15 * struct bpf_prog_info has multiple arrays. The user has option to choose
     16 * arrays to fetch from kernel. The following APIs provide an uniform way to
     17 * fetch these data. All arrays in bpf_prog_info are stored in a single
     18 * continuous memory region. This makes it easy to store the info in a
     19 * file.
     20 *
     21 * Before writing perf_bpil to files, it is necessary to
     22 * translate pointers in bpf_prog_info to offsets. Helper functions
     23 * bpil_addr_to_offs() and bpil_offs_to_addr()
     24 * are introduced to switch between pointers and offsets.
     25 *
     26 * Examples:
     27 *   # To fetch map_ids and prog_tags:
     28 *   __u64 arrays = (1UL << PERF_BPIL_MAP_IDS) |
     29 *           (1UL << PERF_BPIL_PROG_TAGS);
     30 *   struct perf_bpil *info_linear =
     31 *           get_bpf_prog_info_linear(fd, arrays);
     32 *
     33 *   # To save data in file
     34 *   bpil_addr_to_offs(info_linear);
     35 *   write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
     36 *
     37 *   # To read data from file
     38 *   read(f, info_linear, <proper_size>);
     39 *   bpil_offs_to_addr(info_linear);
     40 */
     41enum perf_bpil_array_types {
     42	PERF_BPIL_FIRST_ARRAY = 0,
     43	PERF_BPIL_JITED_INSNS = 0,
     44	PERF_BPIL_XLATED_INSNS,
     45	PERF_BPIL_MAP_IDS,
     46	PERF_BPIL_JITED_KSYMS,
     47	PERF_BPIL_JITED_FUNC_LENS,
     48	PERF_BPIL_FUNC_INFO,
     49	PERF_BPIL_LINE_INFO,
     50	PERF_BPIL_JITED_LINE_INFO,
     51	PERF_BPIL_PROG_TAGS,
     52	PERF_BPIL_LAST_ARRAY,
     53};
     54
     55struct perf_bpil {
     56	/* size of struct bpf_prog_info, when the tool is compiled */
     57	__u32			info_len;
     58	/* total bytes allocated for data, round up to 8 bytes */
     59	__u32			data_len;
     60	/* which arrays are included in data */
     61	__u64			arrays;
     62	struct bpf_prog_info	info;
     63	__u8			data[];
     64};
     65
     66struct perf_bpil *
     67get_bpf_prog_info_linear(int fd, __u64 arrays);
     68
     69void
     70bpil_addr_to_offs(struct perf_bpil *info_linear);
     71
     72void
     73bpil_offs_to_addr(struct perf_bpil *info_linear);
     74
     75#endif /* HAVE_LIBBPF_SUPPORT */
     76#endif /* __PERF_BPF_UTILS_H */