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.h (2589B)

      1// SPDX-License-Identifier: GPL-2.0
      2#ifndef _PERF_BPF_H
      3#define _PERF_BPF_H
      4
      5#include <uapi/linux/bpf.h>
      6
      7/*
      8 * A helper structure used by eBPF C program to describe map attributes to
      9 * elf_bpf loader, taken from tools/testing/selftests/bpf/bpf_helpers.h:
     10 */
     11struct bpf_map {
     12        unsigned int type;
     13        unsigned int key_size;
     14        unsigned int value_size;
     15        unsigned int max_entries;
     16        unsigned int map_flags;
     17        unsigned int inner_map_idx;
     18        unsigned int numa_node;
     19};
     20
     21#define bpf_map(name, _type, type_key, type_val, _max_entries)	\
     22struct bpf_map SEC("maps") name = {				\
     23	.type	     = BPF_MAP_TYPE_##_type,			\
     24	.key_size    = sizeof(type_key),			\
     25	.value_size  = sizeof(type_val),			\
     26	.max_entries = _max_entries,				\
     27};								\
     28struct ____btf_map_##name {					\
     29	type_key key;						\
     30	type_val value;                                 	\
     31};								\
     32struct ____btf_map_##name __attribute__((section(".maps." #name), used)) \
     33	____btf_map_##name = { }
     34
     35/*
     36 * FIXME: this should receive .max_entries as a parameter, as careful
     37 *	  tuning of these limits is needed to avoid hitting limits that
     38 *	  prevents other BPF constructs, such as tracepoint handlers,
     39 *	  to get installed, with cryptic messages from libbpf, etc.
     40 *	  For the current need, 'perf trace --filter-pids', 64 should
     41 *	  be good enough, but this surely needs to be revisited.
     42 */
     43#define pid_map(name, value_type) bpf_map(name, HASH, pid_t, value_type, 64)
     44
     45static int (*bpf_map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags) = (void *)BPF_FUNC_map_update_elem;
     46static void *(*bpf_map_lookup_elem)(struct bpf_map *map, void *key) = (void *)BPF_FUNC_map_lookup_elem;
     47
     48static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *)BPF_FUNC_tail_call;
     49
     50#define SEC(NAME) __attribute__((section(NAME),  used))
     51
     52#define probe(function, vars) \
     53	SEC(#function "=" #function " " #vars) function
     54
     55#define syscall_enter(name) \
     56	SEC("syscalls:sys_enter_" #name) syscall_enter_ ## name
     57
     58#define syscall_exit(name) \
     59	SEC("syscalls:sys_exit_" #name) syscall_exit_ ## name
     60
     61#define license(name) \
     62char _license[] SEC("license") = #name; \
     63int _version SEC("version") = LINUX_VERSION_CODE;
     64
     65static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read;
     66static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str;
     67
     68static int (*perf_event_output)(void *, struct bpf_map *, int, void *, unsigned long) = (void *)BPF_FUNC_perf_event_output;
     69
     70#endif /* _PERF_BPF_H */