1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 #ifndef __BPF_HELPERS__ 3 #define __BPF_HELPERS__ 4 5 #define __uint(name, val) int (*name)[val] 6 #define __type(name, val) typeof(val) *name 7 8 /* helper macro to print out debug messages */ 9 #define bpf_printk(fmt, ...) \ 10 ({ \ 11 char ____fmt[] = fmt; \ 12 bpf_trace_printk(____fmt, sizeof(____fmt), \ 13 ##__VA_ARGS__); \ 14 }) 15 16 #ifdef __clang__ 17 18 /* helper macro to place programs, maps, license in 19 * different sections in elf_bpf file. Section names 20 * are interpreted by elf_bpf loader 21 */ 22 #define SEC(NAME) __attribute__((section(NAME), used)) 23 24 /* helper functions called from eBPF programs written in C */ 25 static void *(*bpf_map_lookup_elem)(void *map, const void *key) = 26 (void *) BPF_FUNC_map_lookup_elem; 27 static int (*bpf_map_update_elem)(void *map, const void *key, const void *value, 28 unsigned long long flags) = 29 (void *) BPF_FUNC_map_update_elem; 30 static int (*bpf_map_delete_elem)(void *map, const void *key) = 31 (void *) BPF_FUNC_map_delete_elem; 32 static int (*bpf_map_push_elem)(void *map, const void *value, 33 unsigned long long flags) = 34 (void *) BPF_FUNC_map_push_elem; 35 static int (*bpf_map_pop_elem)(void *map, void *value) = 36 (void *) BPF_FUNC_map_pop_elem; 37 static int (*bpf_map_peek_elem)(void *map, void *value) = 38 (void *) BPF_FUNC_map_peek_elem; 39 static int (*bpf_probe_read)(void *dst, int size, const void *unsafe_ptr) = 40 (void *) BPF_FUNC_probe_read; 41 static unsigned long long (*bpf_ktime_get_ns)(void) = 42 (void *) BPF_FUNC_ktime_get_ns; 43 static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = 44 (void *) BPF_FUNC_trace_printk; 45 static void (*bpf_tail_call)(void *ctx, void *map, int index) = 46 (void *) BPF_FUNC_tail_call; 47 static unsigned long long (*bpf_get_smp_processor_id)(void) = 48 (void *) BPF_FUNC_get_smp_processor_id; 49 static unsigned long long (*bpf_get_current_pid_tgid)(void) = 50 (void *) BPF_FUNC_get_current_pid_tgid; 51 static unsigned long long (*bpf_get_current_uid_gid)(void) = 52 (void *) BPF_FUNC_get_current_uid_gid; 53 static int (*bpf_get_current_comm)(void *buf, int buf_size) = 54 (void *) BPF_FUNC_get_current_comm; 55 static unsigned long long (*bpf_perf_event_read)(void *map, 56 unsigned long long flags) = 57 (void *) BPF_FUNC_perf_event_read; 58 static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) = 59 (void *) BPF_FUNC_clone_redirect; 60 static int (*bpf_redirect)(int ifindex, int flags) = 61 (void *) BPF_FUNC_redirect; 62 static int (*bpf_redirect_map)(void *map, int key, int flags) = 63 (void *) BPF_FUNC_redirect_map; 64 static int (*bpf_perf_event_output)(void *ctx, void *map, 65 unsigned long long flags, void *data, 66 int size) = 67 (void *) BPF_FUNC_perf_event_output; 68 static int (*bpf_get_stackid)(void *ctx, void *map, int flags) = 69 (void *) BPF_FUNC_get_stackid; 70 static int (*bpf_probe_write_user)(void *dst, const void *src, int size) = 71 (void *) BPF_FUNC_probe_write_user; 72 static int (*bpf_current_task_under_cgroup)(void *map, int index) = 73 (void *) BPF_FUNC_current_task_under_cgroup; 74 static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) = 75 (void *) BPF_FUNC_skb_get_tunnel_key; 76 static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) = 77 (void *) BPF_FUNC_skb_set_tunnel_key; 78 static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) = 79 (void *) BPF_FUNC_skb_get_tunnel_opt; 80 static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) = 81 (void *) BPF_FUNC_skb_set_tunnel_opt; 82 static unsigned long long (*bpf_get_prandom_u32)(void) = 83 (void *) BPF_FUNC_get_prandom_u32; 84 static int (*bpf_xdp_adjust_head)(void *ctx, int offset) = 85 (void *) BPF_FUNC_xdp_adjust_head; 86 static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) = 87 (void *) BPF_FUNC_xdp_adjust_meta; 88 static int (*bpf_get_socket_cookie)(void *ctx) = 89 (void *) BPF_FUNC_get_socket_cookie; 90 static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval, 91 int optlen) = 92 (void *) BPF_FUNC_setsockopt; 93 static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval, 94 int optlen) = 95 (void *) BPF_FUNC_getsockopt; 96 static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) = 97 (void *) BPF_FUNC_sock_ops_cb_flags_set; 98 static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) = 99 (void *) BPF_FUNC_sk_redirect_map; 100 static int (*bpf_sk_redirect_hash)(void *ctx, void *map, void *key, int flags) = 101 (void *) BPF_FUNC_sk_redirect_hash; 102 static int (*bpf_sock_map_update)(void *map, void *key, void *value, 103 unsigned long long flags) = 104 (void *) BPF_FUNC_sock_map_update; 105 static int (*bpf_sock_hash_update)(void *map, void *key, void *value, 106 unsigned long long flags) = 107 (void *) BPF_FUNC_sock_hash_update; 108 static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags, 109 void *buf, unsigned int buf_size) = 110 (void *) BPF_FUNC_perf_event_read_value; 111 static int (*bpf_perf_prog_read_value)(void *ctx, void *buf, 112 unsigned int buf_size) = 113 (void *) BPF_FUNC_perf_prog_read_value; 114 static int (*bpf_override_return)(void *ctx, unsigned long rc) = 115 (void *) BPF_FUNC_override_return; 116 static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) = 117 (void *) BPF_FUNC_msg_redirect_map; 118 static int (*bpf_msg_redirect_hash)(void *ctx, 119 void *map, void *key, int flags) = 120 (void *) BPF_FUNC_msg_redirect_hash; 121 static int (*bpf_msg_apply_bytes)(void *ctx, int len) = 122 (void *) BPF_FUNC_msg_apply_bytes; 123 static int (*bpf_msg_cork_bytes)(void *ctx, int len) = 124 (void *) BPF_FUNC_msg_cork_bytes; 125 static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) = 126 (void *) BPF_FUNC_msg_pull_data; 127 static int (*bpf_msg_push_data)(void *ctx, int start, int end, int flags) = 128 (void *) BPF_FUNC_msg_push_data; 129 static int (*bpf_msg_pop_data)(void *ctx, int start, int cut, int flags) = 130 (void *) BPF_FUNC_msg_pop_data; 131 static int (*bpf_bind)(void *ctx, void *addr, int addr_len) = 132 (void *) BPF_FUNC_bind; 133 static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) = 134 (void *) BPF_FUNC_xdp_adjust_tail; 135 static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state, 136 int size, int flags) = 137 (void *) BPF_FUNC_skb_get_xfrm_state; 138 static int (*bpf_sk_select_reuseport)(void *ctx, void *map, void *key, __u32 flags) = 139 (void *) BPF_FUNC_sk_select_reuseport; 140 static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) = 141 (void *) BPF_FUNC_get_stack; 142 static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params, 143 int plen, __u32 flags) = 144 (void *) BPF_FUNC_fib_lookup; 145 static int (*bpf_lwt_push_encap)(void *ctx, unsigned int type, void *hdr, 146 unsigned int len) = 147 (void *) BPF_FUNC_lwt_push_encap; 148 static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset, 149 void *from, unsigned int len) = 150 (void *) BPF_FUNC_lwt_seg6_store_bytes; 151 static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param, 152 unsigned int param_len) = 153 (void *) BPF_FUNC_lwt_seg6_action; 154 static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset, 155 unsigned int len) = 156 (void *) BPF_FUNC_lwt_seg6_adjust_srh; 157 static int (*bpf_rc_repeat)(void *ctx) = 158 (void *) BPF_FUNC_rc_repeat; 159 static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol, 160 unsigned long long scancode, unsigned int toggle) = 161 (void *) BPF_FUNC_rc_keydown; 162 static unsigned long long (*bpf_get_current_cgroup_id)(void) = 163 (void *) BPF_FUNC_get_current_cgroup_id; 164 static void *(*bpf_get_local_storage)(void *map, unsigned long long flags) = 165 (void *) BPF_FUNC_get_local_storage; 166 static unsigned long long (*bpf_skb_cgroup_id)(void *ctx) = 167 (void *) BPF_FUNC_skb_cgroup_id; 168 static unsigned long long (*bpf_skb_ancestor_cgroup_id)(void *ctx, int level) = 169 (void *) BPF_FUNC_skb_ancestor_cgroup_id; 170 static struct bpf_sock *(*bpf_sk_lookup_tcp)(void *ctx, 171 struct bpf_sock_tuple *tuple, 172 int size, unsigned long long netns_id, 173 unsigned long long flags) = 174 (void *) BPF_FUNC_sk_lookup_tcp; 175 static struct bpf_sock *(*bpf_skc_lookup_tcp)(void *ctx, 176 struct bpf_sock_tuple *tuple, 177 int size, unsigned long long netns_id, 178 unsigned long long flags) = 179 (void *) BPF_FUNC_skc_lookup_tcp; 180 static struct bpf_sock *(*bpf_sk_lookup_udp)(void *ctx, 181 struct bpf_sock_tuple *tuple, 182 int size, unsigned long long netns_id, 183 unsigned long long flags) = 184 (void *) BPF_FUNC_sk_lookup_udp; 185 static int (*bpf_sk_release)(struct bpf_sock *sk) = 186 (void *) BPF_FUNC_sk_release; 187 static int (*bpf_skb_vlan_push)(void *ctx, __be16 vlan_proto, __u16 vlan_tci) = 188 (void *) BPF_FUNC_skb_vlan_push; 189 static int (*bpf_skb_vlan_pop)(void *ctx) = 190 (void *) BPF_FUNC_skb_vlan_pop; 191 static int (*bpf_rc_pointer_rel)(void *ctx, int rel_x, int rel_y) = 192 (void *) BPF_FUNC_rc_pointer_rel; 193 static void (*bpf_spin_lock)(struct bpf_spin_lock *lock) = 194 (void *) BPF_FUNC_spin_lock; 195 static void (*bpf_spin_unlock)(struct bpf_spin_lock *lock) = 196 (void *) BPF_FUNC_spin_unlock; 197 static struct bpf_sock *(*bpf_sk_fullsock)(struct bpf_sock *sk) = 198 (void *) BPF_FUNC_sk_fullsock; 199 static struct bpf_tcp_sock *(*bpf_tcp_sock)(struct bpf_sock *sk) = 200 (void *) BPF_FUNC_tcp_sock; 201 static struct bpf_sock *(*bpf_get_listener_sock)(struct bpf_sock *sk) = 202 (void *) BPF_FUNC_get_listener_sock; 203 static int (*bpf_skb_ecn_set_ce)(void *ctx) = 204 (void *) BPF_FUNC_skb_ecn_set_ce; 205 static int (*bpf_tcp_check_syncookie)(struct bpf_sock *sk, 206 void *ip, int ip_len, void *tcp, int tcp_len) = 207 (void *) BPF_FUNC_tcp_check_syncookie; 208 static int (*bpf_sysctl_get_name)(void *ctx, char *buf, 209 unsigned long long buf_len, 210 unsigned long long flags) = 211 (void *) BPF_FUNC_sysctl_get_name; 212 static int (*bpf_sysctl_get_current_value)(void *ctx, char *buf, 213 unsigned long long buf_len) = 214 (void *) BPF_FUNC_sysctl_get_current_value; 215 static int (*bpf_sysctl_get_new_value)(void *ctx, char *buf, 216 unsigned long long buf_len) = 217 (void *) BPF_FUNC_sysctl_get_new_value; 218 static int (*bpf_sysctl_set_new_value)(void *ctx, const char *buf, 219 unsigned long long buf_len) = 220 (void *) BPF_FUNC_sysctl_set_new_value; 221 static int (*bpf_strtol)(const char *buf, unsigned long long buf_len, 222 unsigned long long flags, long *res) = 223 (void *) BPF_FUNC_strtol; 224 static int (*bpf_strtoul)(const char *buf, unsigned long long buf_len, 225 unsigned long long flags, unsigned long *res) = 226 (void *) BPF_FUNC_strtoul; 227 static void *(*bpf_sk_storage_get)(void *map, struct bpf_sock *sk, 228 void *value, __u64 flags) = 229 (void *) BPF_FUNC_sk_storage_get; 230 static int (*bpf_sk_storage_delete)(void *map, struct bpf_sock *sk) = 231 (void *)BPF_FUNC_sk_storage_delete; 232 static int (*bpf_send_signal)(unsigned sig) = (void *)BPF_FUNC_send_signal; 233 static long long (*bpf_tcp_gen_syncookie)(struct bpf_sock *sk, void *ip, 234 int ip_len, void *tcp, int tcp_len) = 235 (void *) BPF_FUNC_tcp_gen_syncookie; 236 237 /* llvm builtin functions that eBPF C program may use to 238 * emit BPF_LD_ABS and BPF_LD_IND instructions 239 */ 240 struct sk_buff; 241 unsigned long long load_byte(void *skb, 242 unsigned long long off) asm("llvm.bpf.load.byte"); 243 unsigned long long load_half(void *skb, 244 unsigned long long off) asm("llvm.bpf.load.half"); 245 unsigned long long load_word(void *skb, 246 unsigned long long off) asm("llvm.bpf.load.word"); 247 248 /* a helper structure used by eBPF C program 249 * to describe map attributes to elf_bpf loader 250 */ 251 struct bpf_map_def { 252 unsigned int type; 253 unsigned int key_size; 254 unsigned int value_size; 255 unsigned int max_entries; 256 unsigned int map_flags; 257 unsigned int inner_map_idx; 258 unsigned int numa_node; 259 }; 260 261 #else 262 263 #include <bpf-helpers.h> 264 265 #endif 266 267 #define BPF_ANNOTATE_KV_PAIR(name, type_key, type_val) \ 268 struct ____btf_map_##name { \ 269 type_key key; \ 270 type_val value; \ 271 }; \ 272 struct ____btf_map_##name \ 273 __attribute__ ((section(".maps." #name), used)) \ 274 ____btf_map_##name = { } 275 276 static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) = 277 (void *) BPF_FUNC_skb_load_bytes; 278 static int (*bpf_skb_load_bytes_relative)(void *ctx, int off, void *to, int len, __u32 start_header) = 279 (void *) BPF_FUNC_skb_load_bytes_relative; 280 static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) = 281 (void *) BPF_FUNC_skb_store_bytes; 282 static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) = 283 (void *) BPF_FUNC_l3_csum_replace; 284 static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) = 285 (void *) BPF_FUNC_l4_csum_replace; 286 static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) = 287 (void *) BPF_FUNC_csum_diff; 288 static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) = 289 (void *) BPF_FUNC_skb_under_cgroup; 290 static int (*bpf_skb_change_head)(void *, int len, int flags) = 291 (void *) BPF_FUNC_skb_change_head; 292 static int (*bpf_skb_pull_data)(void *, int len) = 293 (void *) BPF_FUNC_skb_pull_data; 294 static unsigned int (*bpf_get_cgroup_classid)(void *ctx) = 295 (void *) BPF_FUNC_get_cgroup_classid; 296 static unsigned int (*bpf_get_route_realm)(void *ctx) = 297 (void *) BPF_FUNC_get_route_realm; 298 static int (*bpf_skb_change_proto)(void *ctx, __be16 proto, __u64 flags) = 299 (void *) BPF_FUNC_skb_change_proto; 300 static int (*bpf_skb_change_type)(void *ctx, __u32 type) = 301 (void *) BPF_FUNC_skb_change_type; 302 static unsigned int (*bpf_get_hash_recalc)(void *ctx) = 303 (void *) BPF_FUNC_get_hash_recalc; 304 static unsigned long long (*bpf_get_current_task)(void) = 305 (void *) BPF_FUNC_get_current_task; 306 static int (*bpf_skb_change_tail)(void *ctx, __u32 len, __u64 flags) = 307 (void *) BPF_FUNC_skb_change_tail; 308 static long long (*bpf_csum_update)(void *ctx, __u32 csum) = 309 (void *) BPF_FUNC_csum_update; 310 static void (*bpf_set_hash_invalid)(void *ctx) = 311 (void *) BPF_FUNC_set_hash_invalid; 312 static int (*bpf_get_numa_node_id)(void) = 313 (void *) BPF_FUNC_get_numa_node_id; 314 static int (*bpf_probe_read_str)(void *ctx, __u32 size, 315 const void *unsafe_ptr) = 316 (void *) BPF_FUNC_probe_read_str; 317 static unsigned int (*bpf_get_socket_uid)(void *ctx) = 318 (void *) BPF_FUNC_get_socket_uid; 319 static unsigned int (*bpf_set_hash)(void *ctx, __u32 hash) = 320 (void *) BPF_FUNC_set_hash; 321 static int (*bpf_skb_adjust_room)(void *ctx, __s32 len_diff, __u32 mode, 322 unsigned long long flags) = 323 (void *) BPF_FUNC_skb_adjust_room; 324 325 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ 326 #if defined(__TARGET_ARCH_x86) 327 #define bpf_target_x86 328 #define bpf_target_defined 329 #elif defined(__TARGET_ARCH_s390) 330 #define bpf_target_s390 331 #define bpf_target_defined 332 #elif defined(__TARGET_ARCH_arm) 333 #define bpf_target_arm 334 #define bpf_target_defined 335 #elif defined(__TARGET_ARCH_arm64) 336 #define bpf_target_arm64 337 #define bpf_target_defined 338 #elif defined(__TARGET_ARCH_mips) 339 #define bpf_target_mips 340 #define bpf_target_defined 341 #elif defined(__TARGET_ARCH_powerpc) 342 #define bpf_target_powerpc 343 #define bpf_target_defined 344 #elif defined(__TARGET_ARCH_sparc) 345 #define bpf_target_sparc 346 #define bpf_target_defined 347 #else 348 #undef bpf_target_defined 349 #endif 350 351 /* Fall back to what the compiler says */ 352 #ifndef bpf_target_defined 353 #if defined(__x86_64__) 354 #define bpf_target_x86 355 #elif defined(__s390__) 356 #define bpf_target_s390 357 #elif defined(__arm__) 358 #define bpf_target_arm 359 #elif defined(__aarch64__) 360 #define bpf_target_arm64 361 #elif defined(__mips__) 362 #define bpf_target_mips 363 #elif defined(__powerpc__) 364 #define bpf_target_powerpc 365 #elif defined(__sparc__) 366 #define bpf_target_sparc 367 #endif 368 #endif 369 370 #if defined(bpf_target_x86) 371 372 #ifdef __KERNEL__ 373 #define PT_REGS_PARM1(x) ((x)->di) 374 #define PT_REGS_PARM2(x) ((x)->si) 375 #define PT_REGS_PARM3(x) ((x)->dx) 376 #define PT_REGS_PARM4(x) ((x)->cx) 377 #define PT_REGS_PARM5(x) ((x)->r8) 378 #define PT_REGS_RET(x) ((x)->sp) 379 #define PT_REGS_FP(x) ((x)->bp) 380 #define PT_REGS_RC(x) ((x)->ax) 381 #define PT_REGS_SP(x) ((x)->sp) 382 #define PT_REGS_IP(x) ((x)->ip) 383 #else 384 #ifdef __i386__ 385 /* i386 kernel is built with -mregparm=3 */ 386 #define PT_REGS_PARM1(x) ((x)->eax) 387 #define PT_REGS_PARM2(x) ((x)->edx) 388 #define PT_REGS_PARM3(x) ((x)->ecx) 389 #define PT_REGS_PARM4(x) 0 390 #define PT_REGS_PARM5(x) 0 391 #define PT_REGS_RET(x) ((x)->esp) 392 #define PT_REGS_FP(x) ((x)->ebp) 393 #define PT_REGS_RC(x) ((x)->eax) 394 #define PT_REGS_SP(x) ((x)->esp) 395 #define PT_REGS_IP(x) ((x)->eip) 396 #else 397 #define PT_REGS_PARM1(x) ((x)->rdi) 398 #define PT_REGS_PARM2(x) ((x)->rsi) 399 #define PT_REGS_PARM3(x) ((x)->rdx) 400 #define PT_REGS_PARM4(x) ((x)->rcx) 401 #define PT_REGS_PARM5(x) ((x)->r8) 402 #define PT_REGS_RET(x) ((x)->rsp) 403 #define PT_REGS_FP(x) ((x)->rbp) 404 #define PT_REGS_RC(x) ((x)->rax) 405 #define PT_REGS_SP(x) ((x)->rsp) 406 #define PT_REGS_IP(x) ((x)->rip) 407 #endif 408 #endif 409 410 #elif defined(bpf_target_s390) 411 412 /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ 413 struct pt_regs; 414 #define PT_REGS_S390 const volatile user_pt_regs 415 #define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2]) 416 #define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3]) 417 #define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4]) 418 #define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5]) 419 #define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6]) 420 #define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14]) 421 /* Works only with CONFIG_FRAME_POINTER */ 422 #define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11]) 423 #define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2]) 424 #define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15]) 425 #define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr) 426 427 #elif defined(bpf_target_arm) 428 429 #define PT_REGS_PARM1(x) ((x)->uregs[0]) 430 #define PT_REGS_PARM2(x) ((x)->uregs[1]) 431 #define PT_REGS_PARM3(x) ((x)->uregs[2]) 432 #define PT_REGS_PARM4(x) ((x)->uregs[3]) 433 #define PT_REGS_PARM5(x) ((x)->uregs[4]) 434 #define PT_REGS_RET(x) ((x)->uregs[14]) 435 #define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */ 436 #define PT_REGS_RC(x) ((x)->uregs[0]) 437 #define PT_REGS_SP(x) ((x)->uregs[13]) 438 #define PT_REGS_IP(x) ((x)->uregs[12]) 439 440 #elif defined(bpf_target_arm64) 441 442 /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ 443 struct pt_regs; 444 #define PT_REGS_ARM64 const volatile struct user_pt_regs 445 #define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0]) 446 #define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1]) 447 #define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2]) 448 #define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3]) 449 #define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4]) 450 #define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30]) 451 /* Works only with CONFIG_FRAME_POINTER */ 452 #define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29]) 453 #define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0]) 454 #define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp) 455 #define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc) 456 457 #elif defined(bpf_target_mips) 458 459 #define PT_REGS_PARM1(x) ((x)->regs[4]) 460 #define PT_REGS_PARM2(x) ((x)->regs[5]) 461 #define PT_REGS_PARM3(x) ((x)->regs[6]) 462 #define PT_REGS_PARM4(x) ((x)->regs[7]) 463 #define PT_REGS_PARM5(x) ((x)->regs[8]) 464 #define PT_REGS_RET(x) ((x)->regs[31]) 465 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ 466 #define PT_REGS_RC(x) ((x)->regs[1]) 467 #define PT_REGS_SP(x) ((x)->regs[29]) 468 #define PT_REGS_IP(x) ((x)->cp0_epc) 469 470 #elif defined(bpf_target_powerpc) 471 472 #define PT_REGS_PARM1(x) ((x)->gpr[3]) 473 #define PT_REGS_PARM2(x) ((x)->gpr[4]) 474 #define PT_REGS_PARM3(x) ((x)->gpr[5]) 475 #define PT_REGS_PARM4(x) ((x)->gpr[6]) 476 #define PT_REGS_PARM5(x) ((x)->gpr[7]) 477 #define PT_REGS_RC(x) ((x)->gpr[3]) 478 #define PT_REGS_SP(x) ((x)->sp) 479 #define PT_REGS_IP(x) ((x)->nip) 480 481 #elif defined(bpf_target_sparc) 482 483 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0]) 484 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1]) 485 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2]) 486 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3]) 487 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4]) 488 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7]) 489 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0]) 490 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP]) 491 492 /* Should this also be a bpf_target check for the sparc case? */ 493 #if defined(__arch64__) 494 #define PT_REGS_IP(x) ((x)->tpc) 495 #else 496 #define PT_REGS_IP(x) ((x)->pc) 497 #endif 498 499 #endif 500 501 #if defined(bpf_target_powerpc) 502 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) 503 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP 504 #elif defined(bpf_target_sparc) 505 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) 506 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP 507 #else 508 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \ 509 bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) 510 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \ 511 bpf_probe_read(&(ip), sizeof(ip), \ 512 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) 513 #endif 514 515 /* 516 * BPF_CORE_READ abstracts away bpf_probe_read() call and captures offset 517 * relocation for source address using __builtin_preserve_access_index() 518 * built-in, provided by Clang. 519 * 520 * __builtin_preserve_access_index() takes as an argument an expression of 521 * taking an address of a field within struct/union. It makes compiler emit 522 * a relocation, which records BTF type ID describing root struct/union and an 523 * accessor string which describes exact embedded field that was used to take 524 * an address. See detailed description of this relocation format and 525 * semantics in comments to struct bpf_offset_reloc in libbpf_internal.h. 526 * 527 * This relocation allows libbpf to adjust BPF instruction to use correct 528 * actual field offset, based on target kernel BTF type that matches original 529 * (local) BTF, used to record relocation. 530 */ 531 #define BPF_CORE_READ(dst, src) \ 532 bpf_probe_read((dst), sizeof(*(src)), \ 533 __builtin_preserve_access_index(src)) 534 535 #endif 536