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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ #ifndef __BPF_TRACING_H__ #define __BPF_TRACING_H__ /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ #if defined(__TARGET_ARCH_x86) #define bpf_target_x86 #define bpf_target_defined #elif defined(__TARGET_ARCH_s390) #define bpf_target_s390 #define bpf_target_defined #elif defined(__TARGET_ARCH_arm) #define bpf_target_arm #define bpf_target_defined #elif defined(__TARGET_ARCH_arm64) #define bpf_target_arm64 #define bpf_target_defined #elif defined(__TARGET_ARCH_mips) #define bpf_target_mips #define bpf_target_defined #elif defined(__TARGET_ARCH_powerpc) #define bpf_target_powerpc #define bpf_target_defined #elif defined(__TARGET_ARCH_sparc) #define bpf_target_sparc #define bpf_target_defined #else #undef bpf_target_defined #endif /* Fall back to what the compiler says */ #ifndef bpf_target_defined #if defined(__x86_64__) #define bpf_target_x86 #elif defined(__s390__) #define bpf_target_s390 #elif defined(__arm__) #define bpf_target_arm #elif defined(__aarch64__) #define bpf_target_arm64 #elif defined(__mips__) #define bpf_target_mips #elif defined(__powerpc__) #define bpf_target_powerpc #elif defined(__sparc__) #define bpf_target_sparc #endif #endif #if defined(bpf_target_x86) #if defined(__KERNEL__) || defined(__VMLINUX_H__) #define PT_REGS_PARM1(x) ((x)->di) #define PT_REGS_PARM2(x) ((x)->si) #define PT_REGS_PARM3(x) ((x)->dx) #define PT_REGS_PARM4(x) ((x)->cx) #define PT_REGS_PARM5(x) ((x)->r8) #define PT_REGS_RET(x) ((x)->sp) #define PT_REGS_FP(x) ((x)->bp) #define PT_REGS_RC(x) ((x)->ax) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->ip) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), di) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), si) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), dx) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), cx) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), sp) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), bp) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), ax) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), ip) #else #ifdef __i386__ /* i386 kernel is built with -mregparm=3 */ #define PT_REGS_PARM1(x) ((x)->eax) #define PT_REGS_PARM2(x) ((x)->edx) #define PT_REGS_PARM3(x) ((x)->ecx) #define PT_REGS_PARM4(x) 0 #define PT_REGS_PARM5(x) 0 #define PT_REGS_RET(x) ((x)->esp) #define PT_REGS_FP(x) ((x)->ebp) #define PT_REGS_RC(x) ((x)->eax) #define PT_REGS_SP(x) ((x)->esp) #define PT_REGS_IP(x) ((x)->eip) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), eax) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), edx) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), ecx) #define PT_REGS_PARM4_CORE(x) 0 #define PT_REGS_PARM5_CORE(x) 0 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), esp) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), ebp) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), eax) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), esp) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), eip) #else #define PT_REGS_PARM1(x) ((x)->rdi) #define PT_REGS_PARM2(x) ((x)->rsi) #define PT_REGS_PARM3(x) ((x)->rdx) #define PT_REGS_PARM4(x) ((x)->rcx) #define PT_REGS_PARM5(x) ((x)->r8) #define PT_REGS_RET(x) ((x)->rsp) #define PT_REGS_FP(x) ((x)->rbp) #define PT_REGS_RC(x) ((x)->rax) #define PT_REGS_SP(x) ((x)->rsp) #define PT_REGS_IP(x) ((x)->rip) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), rdi) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), rsi) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), rdx) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), rcx) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), rsp) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), rbp) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), rax) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), rsp) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), rip) #endif #endif #elif defined(bpf_target_s390) /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ struct pt_regs; #define PT_REGS_S390 const volatile user_pt_regs #define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2]) #define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3]) #define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4]) #define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5]) #define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6]) #define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11]) #define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2]) #define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15]) #define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2]) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[3]) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[4]) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[5]) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[6]) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[14]) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[11]) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2]) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[15]) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), psw.addr) #elif defined(bpf_target_arm) #define PT_REGS_PARM1(x) ((x)->uregs[0]) #define PT_REGS_PARM2(x) ((x)->uregs[1]) #define PT_REGS_PARM3(x) ((x)->uregs[2]) #define PT_REGS_PARM4(x) ((x)->uregs[3]) #define PT_REGS_PARM5(x) ((x)->uregs[4]) #define PT_REGS_RET(x) ((x)->uregs[14]) #define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->uregs[0]) #define PT_REGS_SP(x) ((x)->uregs[13]) #define PT_REGS_IP(x) ((x)->uregs[12]) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), uregs[0]) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), uregs[1]) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), uregs[2]) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), uregs[3]) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), uregs[4]) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), uregs[14]) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), uregs[11]) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), uregs[0]) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), uregs[13]) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), uregs[12]) #elif defined(bpf_target_arm64) /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ struct pt_regs; #define PT_REGS_ARM64 const volatile struct user_pt_regs #define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0]) #define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1]) #define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2]) #define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3]) #define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4]) #define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29]) #define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0]) #define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp) #define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0]) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[1]) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[2]) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[3]) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[4]) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[30]) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[29]) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0]) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), sp) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), pc) #elif defined(bpf_target_mips) #define PT_REGS_PARM1(x) ((x)->regs[4]) #define PT_REGS_PARM2(x) ((x)->regs[5]) #define PT_REGS_PARM3(x) ((x)->regs[6]) #define PT_REGS_PARM4(x) ((x)->regs[7]) #define PT_REGS_PARM5(x) ((x)->regs[8]) #define PT_REGS_RET(x) ((x)->regs[31]) #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->regs[1]) #define PT_REGS_SP(x) ((x)->regs[29]) #define PT_REGS_IP(x) ((x)->cp0_epc) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), regs[4]) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), regs[5]) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), regs[6]) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), regs[7]) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8]) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31]) #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30]) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[1]) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29]) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc) #elif defined(bpf_target_powerpc) #define PT_REGS_PARM1(x) ((x)->gpr[3]) #define PT_REGS_PARM2(x) ((x)->gpr[4]) #define PT_REGS_PARM3(x) ((x)->gpr[5]) #define PT_REGS_PARM4(x) ((x)->gpr[6]) #define PT_REGS_PARM5(x) ((x)->gpr[7]) #define PT_REGS_RC(x) ((x)->gpr[3]) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->nip) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), gpr[3]) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), gpr[4]) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), gpr[5]) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), gpr[6]) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), gpr[7]) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), gpr[3]) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), nip) #elif defined(bpf_target_sparc) #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0]) #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1]) #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2]) #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3]) #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4]) #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7]) #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0]) #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP]) #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0]) #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I1]) #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I2]) #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I3]) #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I4]) #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I7]) #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0]) #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), u_regs[UREG_FP]) /* Should this also be a bpf_target check for the sparc case? */ #if defined(__arch64__) #define PT_REGS_IP(x) ((x)->tpc) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), tpc) #else #define PT_REGS_IP(x) ((x)->pc) #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), pc) #endif #endif #if defined(bpf_target_powerpc) #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP #elif defined(bpf_target_sparc) #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP #else #define BPF_KPROBE_READ_RET_IP(ip, ctx) \ ({ bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ ({ bpf_probe_read(&(ip), sizeof(ip), \ (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) #endif #define ___bpf_concat(a, b) a ## b #define ___bpf_apply(fn, n) ___bpf_concat(fn, n) #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N #define ___bpf_narg(...) \ ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) #define ___bpf_empty(...) \ ___bpf_nth(_, ##__VA_ARGS__, N, N, N, N, N, N, N, N, N, N, 0) #define ___bpf_ctx_cast0() ctx #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0] #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1] #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2] #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3] #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4] #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5] #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6] #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7] #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8] #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9] #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10] #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11] #define ___bpf_ctx_cast(args...) \ ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) /* * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and * similar kinds of BPF programs, that accept input arguments as a single * pointer to untyped u64 array, where each u64 can actually be a typed * pointer or integer of different size. Instead of requring user to write * manual casts and work with array elements by index, BPF_PROG macro * allows user to declare a list of named and typed input arguments in the * same syntax as for normal C function. All the casting is hidden and * performed transparently, while user code can just assume working with * function arguments of specified type and name. * * Original raw context argument is preserved as well as 'ctx' argument. * This is useful when using BPF helpers that expect original context * as one of the parameters (e.g., for bpf_perf_event_output()). */ #define BPF_PROG(name, args...) \ name(unsigned long long *ctx); \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(unsigned long long *ctx, ##args); \ typeof(name(0)) name(unsigned long long *ctx) \ { \ _Pragma("GCC diagnostic push") \ _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ return ____##name(___bpf_ctx_cast(args)); \ _Pragma("GCC diagnostic pop") \ } \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(unsigned long long *ctx, ##args) struct pt_regs; #define ___bpf_kprobe_args0() ctx #define ___bpf_kprobe_args1(x) \ ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx) #define ___bpf_kprobe_args2(x, args...) \ ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx) #define ___bpf_kprobe_args3(x, args...) \ ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx) #define ___bpf_kprobe_args4(x, args...) \ ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx) #define ___bpf_kprobe_args5(x, args...) \ ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx) #define ___bpf_kprobe_args(args...) \ ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args) /* * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific * low-level way of getting kprobe input arguments from struct pt_regs, and * provides a familiar typed and named function arguments syntax and * semantics of accessing kprobe input paremeters. * * Original struct pt_regs* context is preserved as 'ctx' argument. This might * be necessary when using BPF helpers like bpf_perf_event_output(). */ #define BPF_KPROBE(name, args...) \ name(struct pt_regs *ctx); \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args); \ typeof(name(0)) name(struct pt_regs *ctx) \ { \ _Pragma("GCC diagnostic push") \ _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ return ____##name(___bpf_kprobe_args(args)); \ _Pragma("GCC diagnostic pop") \ } \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args) #define ___bpf_kretprobe_args0() ctx #define ___bpf_kretprobe_args1(x) \ ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx) #define ___bpf_kretprobe_args(args...) \ ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args) /* * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional * return value (in addition to `struct pt_regs *ctx`), but no input * arguments, because they will be clobbered by the time probed function * returns. */ #define BPF_KRETPROBE(name, args...) \ name(struct pt_regs *ctx); \ static __attribute__((always_inline)) typeof(name(0)) \ ____##name(struct pt_regs *ctx, ##args); \ typeof(name(0)) name(struct pt_regs *ctx) \ { \ _Pragma("GCC diagnostic push") \ _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ return ____##name(___bpf_kretprobe_args(args)); \ _Pragma("GCC diagnostic pop") \ } \ static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) /* * BPF_SEQ_PRINTF to wrap bpf_seq_printf to-be-printed values * in a structure. */ #define BPF_SEQ_PRINTF(seq, fmt, args...) \ ({ \ _Pragma("GCC diagnostic push") \ _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ static const char ___fmt[] = fmt; \ unsigned long long ___param[] = { args }; \ _Pragma("GCC diagnostic pop") \ int ___ret = bpf_seq_printf(seq, ___fmt, sizeof(___fmt), \ ___param, sizeof(___param)); \ ___ret; \ }) #endif |