1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 #ifndef __BPF_TRACING_H__ 3 #define __BPF_TRACING_H__ 4 5 #include "bpf_helpers.h" 6 7 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ 8 #if defined(__TARGET_ARCH_x86) 9 #define bpf_target_x86 10 #define bpf_target_defined 11 #elif defined(__TARGET_ARCH_s390) 12 #define bpf_target_s390 13 #define bpf_target_defined 14 #elif defined(__TARGET_ARCH_arm) 15 #define bpf_target_arm 16 #define bpf_target_defined 17 #elif defined(__TARGET_ARCH_arm64) 18 #define bpf_target_arm64 19 #define bpf_target_defined 20 #elif defined(__TARGET_ARCH_mips) 21 #define bpf_target_mips 22 #define bpf_target_defined 23 #elif defined(__TARGET_ARCH_powerpc) 24 #define bpf_target_powerpc 25 #define bpf_target_defined 26 #elif defined(__TARGET_ARCH_sparc) 27 #define bpf_target_sparc 28 #define bpf_target_defined 29 #elif defined(__TARGET_ARCH_riscv) 30 #define bpf_target_riscv 31 #define bpf_target_defined 32 #elif defined(__TARGET_ARCH_arc) 33 #define bpf_target_arc 34 #define bpf_target_defined 35 #elif defined(__TARGET_ARCH_loongarch) 36 #define bpf_target_loongarch 37 #define bpf_target_defined 38 #else 39 40 /* Fall back to what the compiler says */ 41 #if defined(__x86_64__) 42 #define bpf_target_x86 43 #define bpf_target_defined 44 #elif defined(__s390__) 45 #define bpf_target_s390 46 #define bpf_target_defined 47 #elif defined(__arm__) 48 #define bpf_target_arm 49 #define bpf_target_defined 50 #elif defined(__aarch64__) 51 #define bpf_target_arm64 52 #define bpf_target_defined 53 #elif defined(__mips__) 54 #define bpf_target_mips 55 #define bpf_target_defined 56 #elif defined(__powerpc__) 57 #define bpf_target_powerpc 58 #define bpf_target_defined 59 #elif defined(__sparc__) 60 #define bpf_target_sparc 61 #define bpf_target_defined 62 #elif defined(__riscv) && __riscv_xlen == 64 63 #define bpf_target_riscv 64 #define bpf_target_defined 65 #elif defined(__arc__) 66 #define bpf_target_arc 67 #define bpf_target_defined 68 #elif defined(__loongarch__) 69 #define bpf_target_loongarch 70 #define bpf_target_defined 71 #endif /* no compiler target */ 72 73 #endif 74 75 #ifndef __BPF_TARGET_MISSING 76 #define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\"" 77 #endif 78 79 #if defined(bpf_target_x86) 80 81 /* 82 * https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI 83 */ 84 85 #if defined(__KERNEL__) || defined(__VMLINUX_H__) 86 87 #define __PT_PARM1_REG di 88 #define __PT_PARM2_REG si 89 #define __PT_PARM3_REG dx 90 #define __PT_PARM4_REG cx 91 #define __PT_PARM5_REG r8 92 #define __PT_PARM6_REG r9 93 /* 94 * Syscall uses r10 for PARM4. See arch/x86/entry/entry_64.S:entry_SYSCALL_64 95 * comments in Linux sources. And refer to syscall(2) manpage. 96 */ 97 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 98 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 99 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 100 #define __PT_PARM4_SYSCALL_REG r10 101 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 102 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 103 104 #define __PT_RET_REG sp 105 #define __PT_FP_REG bp 106 #define __PT_RC_REG ax 107 #define __PT_SP_REG sp 108 #define __PT_IP_REG ip 109 110 #else 111 112 #ifdef __i386__ 113 114 /* i386 kernel is built with -mregparm=3 */ 115 #define __PT_PARM1_REG eax 116 #define __PT_PARM2_REG edx 117 #define __PT_PARM3_REG ecx 118 /* i386 syscall ABI is very different, refer to syscall(2) manpage */ 119 #define __PT_PARM1_SYSCALL_REG ebx 120 #define __PT_PARM2_SYSCALL_REG ecx 121 #define __PT_PARM3_SYSCALL_REG edx 122 #define __PT_PARM4_SYSCALL_REG esi 123 #define __PT_PARM5_SYSCALL_REG edi 124 #define __PT_PARM6_SYSCALL_REG ebp 125 126 #define __PT_RET_REG esp 127 #define __PT_FP_REG ebp 128 #define __PT_RC_REG eax 129 #define __PT_SP_REG esp 130 #define __PT_IP_REG eip 131 132 #else /* __i386__ */ 133 134 #define __PT_PARM1_REG rdi 135 #define __PT_PARM2_REG rsi 136 #define __PT_PARM3_REG rdx 137 #define __PT_PARM4_REG rcx 138 #define __PT_PARM5_REG r8 139 #define __PT_PARM6_REG r9 140 141 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 142 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 143 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 144 #define __PT_PARM4_SYSCALL_REG r10 145 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 146 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 147 148 #define __PT_RET_REG rsp 149 #define __PT_FP_REG rbp 150 #define __PT_RC_REG rax 151 #define __PT_SP_REG rsp 152 #define __PT_IP_REG rip 153 154 #endif /* __i386__ */ 155 156 #endif /* __KERNEL__ || __VMLINUX_H__ */ 157 158 #elif defined(bpf_target_s390) 159 160 /* 161 * https://github.com/IBM/s390x-abi/releases/download/v1.6/lzsabi_s390x.pdf 162 */ 163 164 struct pt_regs___s390 { 165 unsigned long orig_gpr2; 166 }; 167 168 /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ 169 #define __PT_REGS_CAST(x) ((const user_pt_regs *)(x)) 170 #define __PT_PARM1_REG gprs[2] 171 #define __PT_PARM2_REG gprs[3] 172 #define __PT_PARM3_REG gprs[4] 173 #define __PT_PARM4_REG gprs[5] 174 #define __PT_PARM5_REG gprs[6] 175 176 #define __PT_PARM1_SYSCALL_REG orig_gpr2 177 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 178 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 179 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 180 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 181 #define __PT_PARM6_SYSCALL_REG gprs[7] 182 #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) 183 #define PT_REGS_PARM1_CORE_SYSCALL(x) \ 184 BPF_CORE_READ((const struct pt_regs___s390 *)(x), __PT_PARM1_SYSCALL_REG) 185 186 #define __PT_RET_REG gprs[14] 187 #define __PT_FP_REG gprs[11] /* Works only with CONFIG_FRAME_POINTER */ 188 #define __PT_RC_REG gprs[2] 189 #define __PT_SP_REG gprs[15] 190 #define __PT_IP_REG psw.addr 191 192 #elif defined(bpf_target_arm) 193 194 /* 195 * https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst#machine-registers 196 */ 197 198 #define __PT_PARM1_REG uregs[0] 199 #define __PT_PARM2_REG uregs[1] 200 #define __PT_PARM3_REG uregs[2] 201 #define __PT_PARM4_REG uregs[3] 202 203 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 204 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 205 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 206 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 207 #define __PT_PARM5_SYSCALL_REG uregs[4] 208 #define __PT_PARM6_SYSCALL_REG uregs[5] 209 #define __PT_PARM7_SYSCALL_REG uregs[6] 210 211 #define __PT_RET_REG uregs[14] 212 #define __PT_FP_REG uregs[11] /* Works only with CONFIG_FRAME_POINTER */ 213 #define __PT_RC_REG uregs[0] 214 #define __PT_SP_REG uregs[13] 215 #define __PT_IP_REG uregs[12] 216 217 #elif defined(bpf_target_arm64) 218 219 /* 220 * https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#machine-registers 221 */ 222 223 struct pt_regs___arm64 { 224 unsigned long orig_x0; 225 }; 226 227 /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ 228 #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) 229 #define __PT_PARM1_REG regs[0] 230 #define __PT_PARM2_REG regs[1] 231 #define __PT_PARM3_REG regs[2] 232 #define __PT_PARM4_REG regs[3] 233 #define __PT_PARM5_REG regs[4] 234 #define __PT_PARM6_REG regs[5] 235 #define __PT_PARM7_REG regs[6] 236 #define __PT_PARM8_REG regs[7] 237 238 #define __PT_PARM1_SYSCALL_REG orig_x0 239 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 240 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 241 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 242 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 243 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 244 #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) 245 #define PT_REGS_PARM1_CORE_SYSCALL(x) \ 246 BPF_CORE_READ((const struct pt_regs___arm64 *)(x), __PT_PARM1_SYSCALL_REG) 247 248 #define __PT_RET_REG regs[30] 249 #define __PT_FP_REG regs[29] /* Works only with CONFIG_FRAME_POINTER */ 250 #define __PT_RC_REG regs[0] 251 #define __PT_SP_REG sp 252 #define __PT_IP_REG pc 253 254 #elif defined(bpf_target_mips) 255 256 /* 257 * N64 ABI is assumed right now. 258 * https://en.wikipedia.org/wiki/MIPS_architecture#Calling_conventions 259 */ 260 261 #define __PT_PARM1_REG regs[4] 262 #define __PT_PARM2_REG regs[5] 263 #define __PT_PARM3_REG regs[6] 264 #define __PT_PARM4_REG regs[7] 265 #define __PT_PARM5_REG regs[8] 266 #define __PT_PARM6_REG regs[9] 267 #define __PT_PARM7_REG regs[10] 268 #define __PT_PARM8_REG regs[11] 269 270 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 271 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 272 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 273 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 274 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG /* only N32/N64 */ 275 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG /* only N32/N64 */ 276 277 #define __PT_RET_REG regs[31] 278 #define __PT_FP_REG regs[30] /* Works only with CONFIG_FRAME_POINTER */ 279 #define __PT_RC_REG regs[2] 280 #define __PT_SP_REG regs[29] 281 #define __PT_IP_REG cp0_epc 282 283 #elif defined(bpf_target_powerpc) 284 285 /* 286 * http://refspecs.linux-foundation.org/elf/elfspec_ppc.pdf (page 3-14, 287 * section "Function Calling Sequence") 288 */ 289 290 #define __PT_PARM1_REG gpr[3] 291 #define __PT_PARM2_REG gpr[4] 292 #define __PT_PARM3_REG gpr[5] 293 #define __PT_PARM4_REG gpr[6] 294 #define __PT_PARM5_REG gpr[7] 295 #define __PT_PARM6_REG gpr[8] 296 #define __PT_PARM7_REG gpr[9] 297 #define __PT_PARM8_REG gpr[10] 298 299 /* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER. */ 300 #define PT_REGS_SYSCALL_REGS(ctx) ctx 301 #define __PT_PARM1_SYSCALL_REG orig_gpr3 302 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 303 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 304 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 305 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 306 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 307 #if !defined(__arch64__) 308 #define __PT_PARM7_SYSCALL_REG __PT_PARM7_REG /* only powerpc (not powerpc64) */ 309 #endif 310 311 #define __PT_RET_REG regs[31] 312 #define __PT_FP_REG __unsupported__ 313 #define __PT_RC_REG gpr[3] 314 #define __PT_SP_REG sp 315 #define __PT_IP_REG nip 316 317 #elif defined(bpf_target_sparc) 318 319 /* 320 * https://en.wikipedia.org/wiki/Calling_convention#SPARC 321 */ 322 323 #define __PT_PARM1_REG u_regs[UREG_I0] 324 #define __PT_PARM2_REG u_regs[UREG_I1] 325 #define __PT_PARM3_REG u_regs[UREG_I2] 326 #define __PT_PARM4_REG u_regs[UREG_I3] 327 #define __PT_PARM5_REG u_regs[UREG_I4] 328 #define __PT_PARM6_REG u_regs[UREG_I5] 329 330 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 331 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 332 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 333 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 334 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 335 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 336 337 #define __PT_RET_REG u_regs[UREG_I7] 338 #define __PT_FP_REG __unsupported__ 339 #define __PT_RC_REG u_regs[UREG_I0] 340 #define __PT_SP_REG u_regs[UREG_FP] 341 /* Should this also be a bpf_target check for the sparc case? */ 342 #if defined(__arch64__) 343 #define __PT_IP_REG tpc 344 #else 345 #define __PT_IP_REG pc 346 #endif 347 348 #elif defined(bpf_target_riscv) 349 350 /* 351 * https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc#risc-v-calling-conventions 352 */ 353 354 /* riscv provides struct user_regs_struct instead of struct pt_regs to userspace */ 355 #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) 356 #define __PT_PARM1_REG a0 357 #define __PT_PARM2_REG a1 358 #define __PT_PARM3_REG a2 359 #define __PT_PARM4_REG a3 360 #define __PT_PARM5_REG a4 361 #define __PT_PARM6_REG a5 362 #define __PT_PARM7_REG a6 363 #define __PT_PARM8_REG a7 364 365 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 366 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 367 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 368 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 369 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 370 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 371 372 #define __PT_RET_REG ra 373 #define __PT_FP_REG s0 374 #define __PT_RC_REG a0 375 #define __PT_SP_REG sp 376 #define __PT_IP_REG pc 377 378 #elif defined(bpf_target_arc) 379 380 /* 381 * Section "Function Calling Sequence" (page 24): 382 * https://raw.githubusercontent.com/wiki/foss-for-synopsys-dwc-arc-processors/toolchain/files/ARCv2_ABI.pdf 383 */ 384 385 /* arc provides struct user_regs_struct instead of struct pt_regs to userspace */ 386 #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) 387 #define __PT_PARM1_REG scratch.r0 388 #define __PT_PARM2_REG scratch.r1 389 #define __PT_PARM3_REG scratch.r2 390 #define __PT_PARM4_REG scratch.r3 391 #define __PT_PARM5_REG scratch.r4 392 #define __PT_PARM6_REG scratch.r5 393 #define __PT_PARM7_REG scratch.r6 394 #define __PT_PARM8_REG scratch.r7 395 396 /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */ 397 #define PT_REGS_SYSCALL_REGS(ctx) ctx 398 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 399 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 400 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 401 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 402 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 403 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 404 405 #define __PT_RET_REG scratch.blink 406 #define __PT_FP_REG scratch.fp 407 #define __PT_RC_REG scratch.r0 408 #define __PT_SP_REG scratch.sp 409 #define __PT_IP_REG scratch.ret 410 411 #elif defined(bpf_target_loongarch) 412 413 /* 414 * https://docs.kernel.org/loongarch/introduction.html 415 * https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html 416 */ 417 418 /* loongarch provides struct user_pt_regs instead of struct pt_regs to userspace */ 419 #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) 420 #define __PT_PARM1_REG regs[4] 421 #define __PT_PARM2_REG regs[5] 422 #define __PT_PARM3_REG regs[6] 423 #define __PT_PARM4_REG regs[7] 424 #define __PT_PARM5_REG regs[8] 425 #define __PT_PARM6_REG regs[9] 426 #define __PT_PARM7_REG regs[10] 427 #define __PT_PARM8_REG regs[11] 428 429 /* loongarch does not select ARCH_HAS_SYSCALL_WRAPPER. */ 430 #define PT_REGS_SYSCALL_REGS(ctx) ctx 431 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG 432 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG 433 #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG 434 #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG 435 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG 436 #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG 437 438 #define __PT_RET_REG regs[1] 439 #define __PT_FP_REG regs[22] 440 #define __PT_RC_REG regs[4] 441 #define __PT_SP_REG regs[3] 442 #define __PT_IP_REG csr_era 443 444 #endif 445 446 #if defined(bpf_target_defined) 447 448 struct pt_regs; 449 450 /* allow some architectures to override `struct pt_regs` */ 451 #ifndef __PT_REGS_CAST 452 #define __PT_REGS_CAST(x) (x) 453 #endif 454 455 /* 456 * Different architectures support different number of arguments passed 457 * through registers. i386 supports just 3, some arches support up to 8. 458 */ 459 #ifndef __PT_PARM4_REG 460 #define __PT_PARM4_REG __unsupported__ 461 #endif 462 #ifndef __PT_PARM5_REG 463 #define __PT_PARM5_REG __unsupported__ 464 #endif 465 #ifndef __PT_PARM6_REG 466 #define __PT_PARM6_REG __unsupported__ 467 #endif 468 #ifndef __PT_PARM7_REG 469 #define __PT_PARM7_REG __unsupported__ 470 #endif 471 #ifndef __PT_PARM8_REG 472 #define __PT_PARM8_REG __unsupported__ 473 #endif 474 /* 475 * Similarly, syscall-specific conventions might differ between function call 476 * conventions within each architecutre. All supported architectures pass 477 * either 6 or 7 syscall arguments in registers. 478 * 479 * See syscall(2) manpage for succinct table with information on each arch. 480 */ 481 #ifndef __PT_PARM7_SYSCALL_REG 482 #define __PT_PARM7_SYSCALL_REG __unsupported__ 483 #endif 484 485 #define PT_REGS_PARM1(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG) 486 #define PT_REGS_PARM2(x) (__PT_REGS_CAST(x)->__PT_PARM2_REG) 487 #define PT_REGS_PARM3(x) (__PT_REGS_CAST(x)->__PT_PARM3_REG) 488 #define PT_REGS_PARM4(x) (__PT_REGS_CAST(x)->__PT_PARM4_REG) 489 #define PT_REGS_PARM5(x) (__PT_REGS_CAST(x)->__PT_PARM5_REG) 490 #define PT_REGS_PARM6(x) (__PT_REGS_CAST(x)->__PT_PARM6_REG) 491 #define PT_REGS_PARM7(x) (__PT_REGS_CAST(x)->__PT_PARM7_REG) 492 #define PT_REGS_PARM8(x) (__PT_REGS_CAST(x)->__PT_PARM8_REG) 493 #define PT_REGS_RET(x) (__PT_REGS_CAST(x)->__PT_RET_REG) 494 #define PT_REGS_FP(x) (__PT_REGS_CAST(x)->__PT_FP_REG) 495 #define PT_REGS_RC(x) (__PT_REGS_CAST(x)->__PT_RC_REG) 496 #define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG) 497 #define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG) 498 499 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_REG) 500 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_REG) 501 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_REG) 502 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_REG) 503 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_REG) 504 #define PT_REGS_PARM6_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM6_REG) 505 #define PT_REGS_PARM7_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM7_REG) 506 #define PT_REGS_PARM8_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM8_REG) 507 #define PT_REGS_RET_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RET_REG) 508 #define PT_REGS_FP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_FP_REG) 509 #define PT_REGS_RC_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RC_REG) 510 #define PT_REGS_SP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_SP_REG) 511 #define PT_REGS_IP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_IP_REG) 512 513 #if defined(bpf_target_powerpc) 514 515 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) 516 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP 517 518 #elif defined(bpf_target_sparc) 519 520 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) 521 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP 522 523 #else 524 525 #define BPF_KPROBE_READ_RET_IP(ip, ctx) \ 526 ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) 527 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ 528 ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) 529 530 #endif 531 532 #ifndef PT_REGS_PARM1_SYSCALL 533 #define PT_REGS_PARM1_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM1_SYSCALL_REG) 534 #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_SYSCALL_REG) 535 #endif 536 #ifndef PT_REGS_PARM2_SYSCALL 537 #define PT_REGS_PARM2_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM2_SYSCALL_REG) 538 #define PT_REGS_PARM2_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_SYSCALL_REG) 539 #endif 540 #ifndef PT_REGS_PARM3_SYSCALL 541 #define PT_REGS_PARM3_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM3_SYSCALL_REG) 542 #define PT_REGS_PARM3_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_SYSCALL_REG) 543 #endif 544 #ifndef PT_REGS_PARM4_SYSCALL 545 #define PT_REGS_PARM4_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM4_SYSCALL_REG) 546 #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_SYSCALL_REG) 547 #endif 548 #ifndef PT_REGS_PARM5_SYSCALL 549 #define PT_REGS_PARM5_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM5_SYSCALL_REG) 550 #define PT_REGS_PARM5_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_SYSCALL_REG) 551 #endif 552 #ifndef PT_REGS_PARM6_SYSCALL 553 #define PT_REGS_PARM6_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM6_SYSCALL_REG) 554 #define PT_REGS_PARM6_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM6_SYSCALL_REG) 555 #endif 556 #ifndef PT_REGS_PARM7_SYSCALL 557 #define PT_REGS_PARM7_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM7_SYSCALL_REG) 558 #define PT_REGS_PARM7_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM7_SYSCALL_REG) 559 #endif 560 561 #else /* defined(bpf_target_defined) */ 562 563 #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 564 #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 565 #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 566 #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 567 #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 568 #define PT_REGS_PARM6(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 569 #define PT_REGS_PARM7(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 570 #define PT_REGS_PARM8(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 571 #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 572 #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 573 #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 574 #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 575 #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 576 577 #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 578 #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 579 #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 580 #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 581 #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 582 #define PT_REGS_PARM6_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 583 #define PT_REGS_PARM7_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 584 #define PT_REGS_PARM8_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 585 #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 586 #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 587 #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 588 #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 589 #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 590 591 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 592 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 593 594 #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 595 #define PT_REGS_PARM2_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 596 #define PT_REGS_PARM3_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 597 #define PT_REGS_PARM4_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 598 #define PT_REGS_PARM5_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 599 #define PT_REGS_PARM6_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 600 #define PT_REGS_PARM7_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 601 602 #define PT_REGS_PARM1_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 603 #define PT_REGS_PARM2_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 604 #define PT_REGS_PARM3_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 605 #define PT_REGS_PARM4_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 606 #define PT_REGS_PARM5_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 607 #define PT_REGS_PARM6_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 608 #define PT_REGS_PARM7_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) 609 610 #endif /* defined(bpf_target_defined) */ 611 612 /* 613 * When invoked from a syscall handler kprobe, returns a pointer to a 614 * struct pt_regs containing syscall arguments and suitable for passing to 615 * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL(). 616 */ 617 #ifndef PT_REGS_SYSCALL_REGS 618 /* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */ 619 #define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx)) 620 #endif 621 622 #ifndef ___bpf_concat 623 #define ___bpf_concat(a, b) a ## b 624 #endif 625 #ifndef ___bpf_apply 626 #define ___bpf_apply(fn, n) ___bpf_concat(fn, n) 627 #endif 628 #ifndef ___bpf_nth 629 #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N 630 #endif 631 #ifndef ___bpf_narg 632 #define ___bpf_narg(...) ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) 633 #endif 634 635 #define ___bpf_ctx_cast0() ctx 636 #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0] 637 #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1] 638 #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2] 639 #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3] 640 #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4] 641 #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5] 642 #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6] 643 #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7] 644 #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8] 645 #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9] 646 #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10] 647 #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11] 648 #define ___bpf_ctx_cast(args...) ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) 649 650 /* 651 * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and 652 * similar kinds of BPF programs, that accept input arguments as a single 653 * pointer to untyped u64 array, where each u64 can actually be a typed 654 * pointer or integer of different size. Instead of requring user to write 655 * manual casts and work with array elements by index, BPF_PROG macro 656 * allows user to declare a list of named and typed input arguments in the 657 * same syntax as for normal C function. All the casting is hidden and 658 * performed transparently, while user code can just assume working with 659 * function arguments of specified type and name. 660 * 661 * Original raw context argument is preserved as well as 'ctx' argument. 662 * This is useful when using BPF helpers that expect original context 663 * as one of the parameters (e.g., for bpf_perf_event_output()). 664 */ 665 #define BPF_PROG(name, args...) \ 666 name(unsigned long long *ctx); \ 667 static __always_inline typeof(name(0)) \ 668 ____##name(unsigned long long *ctx, ##args); \ 669 typeof(name(0)) name(unsigned long long *ctx) \ 670 { \ 671 _Pragma("GCC diagnostic push") \ 672 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 673 return ____##name(___bpf_ctx_cast(args)); \ 674 _Pragma("GCC diagnostic pop") \ 675 } \ 676 static __always_inline typeof(name(0)) \ 677 ____##name(unsigned long long *ctx, ##args) 678 679 #ifndef ___bpf_nth2 680 #define ___bpf_nth2(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, \ 681 _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, N, ...) N 682 #endif 683 #ifndef ___bpf_narg2 684 #define ___bpf_narg2(...) \ 685 ___bpf_nth2(_, ##__VA_ARGS__, 12, 12, 11, 11, 10, 10, 9, 9, 8, 8, 7, 7, \ 686 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0) 687 #endif 688 689 #define ___bpf_treg_cnt(t) \ 690 __builtin_choose_expr(sizeof(t) == 1, 1, \ 691 __builtin_choose_expr(sizeof(t) == 2, 1, \ 692 __builtin_choose_expr(sizeof(t) == 4, 1, \ 693 __builtin_choose_expr(sizeof(t) == 8, 1, \ 694 __builtin_choose_expr(sizeof(t) == 16, 2, \ 695 (void)0))))) 696 697 #define ___bpf_reg_cnt0() (0) 698 #define ___bpf_reg_cnt1(t, x) (___bpf_reg_cnt0() + ___bpf_treg_cnt(t)) 699 #define ___bpf_reg_cnt2(t, x, args...) (___bpf_reg_cnt1(args) + ___bpf_treg_cnt(t)) 700 #define ___bpf_reg_cnt3(t, x, args...) (___bpf_reg_cnt2(args) + ___bpf_treg_cnt(t)) 701 #define ___bpf_reg_cnt4(t, x, args...) (___bpf_reg_cnt3(args) + ___bpf_treg_cnt(t)) 702 #define ___bpf_reg_cnt5(t, x, args...) (___bpf_reg_cnt4(args) + ___bpf_treg_cnt(t)) 703 #define ___bpf_reg_cnt6(t, x, args...) (___bpf_reg_cnt5(args) + ___bpf_treg_cnt(t)) 704 #define ___bpf_reg_cnt7(t, x, args...) (___bpf_reg_cnt6(args) + ___bpf_treg_cnt(t)) 705 #define ___bpf_reg_cnt8(t, x, args...) (___bpf_reg_cnt7(args) + ___bpf_treg_cnt(t)) 706 #define ___bpf_reg_cnt9(t, x, args...) (___bpf_reg_cnt8(args) + ___bpf_treg_cnt(t)) 707 #define ___bpf_reg_cnt10(t, x, args...) (___bpf_reg_cnt9(args) + ___bpf_treg_cnt(t)) 708 #define ___bpf_reg_cnt11(t, x, args...) (___bpf_reg_cnt10(args) + ___bpf_treg_cnt(t)) 709 #define ___bpf_reg_cnt12(t, x, args...) (___bpf_reg_cnt11(args) + ___bpf_treg_cnt(t)) 710 #define ___bpf_reg_cnt(args...) ___bpf_apply(___bpf_reg_cnt, ___bpf_narg2(args))(args) 711 712 #define ___bpf_union_arg(t, x, n) \ 713 __builtin_choose_expr(sizeof(t) == 1, ({ union { __u8 z[1]; t x; } ___t = { .z = {ctx[n]}}; ___t.x; }), \ 714 __builtin_choose_expr(sizeof(t) == 2, ({ union { __u16 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ 715 __builtin_choose_expr(sizeof(t) == 4, ({ union { __u32 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ 716 __builtin_choose_expr(sizeof(t) == 8, ({ union { __u64 z[1]; t x; } ___t = {.z = {ctx[n]} }; ___t.x; }), \ 717 __builtin_choose_expr(sizeof(t) == 16, ({ union { __u64 z[2]; t x; } ___t = {.z = {ctx[n], ctx[n + 1]} }; ___t.x; }), \ 718 (void)0))))) 719 720 #define ___bpf_ctx_arg0(n, args...) 721 #define ___bpf_ctx_arg1(n, t, x) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt1(t, x)) 722 #define ___bpf_ctx_arg2(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt2(t, x, args)) ___bpf_ctx_arg1(n, args) 723 #define ___bpf_ctx_arg3(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt3(t, x, args)) ___bpf_ctx_arg2(n, args) 724 #define ___bpf_ctx_arg4(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt4(t, x, args)) ___bpf_ctx_arg3(n, args) 725 #define ___bpf_ctx_arg5(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt5(t, x, args)) ___bpf_ctx_arg4(n, args) 726 #define ___bpf_ctx_arg6(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt6(t, x, args)) ___bpf_ctx_arg5(n, args) 727 #define ___bpf_ctx_arg7(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt7(t, x, args)) ___bpf_ctx_arg6(n, args) 728 #define ___bpf_ctx_arg8(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt8(t, x, args)) ___bpf_ctx_arg7(n, args) 729 #define ___bpf_ctx_arg9(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt9(t, x, args)) ___bpf_ctx_arg8(n, args) 730 #define ___bpf_ctx_arg10(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt10(t, x, args)) ___bpf_ctx_arg9(n, args) 731 #define ___bpf_ctx_arg11(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt11(t, x, args)) ___bpf_ctx_arg10(n, args) 732 #define ___bpf_ctx_arg12(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt12(t, x, args)) ___bpf_ctx_arg11(n, args) 733 #define ___bpf_ctx_arg(args...) ___bpf_apply(___bpf_ctx_arg, ___bpf_narg2(args))(___bpf_reg_cnt(args), args) 734 735 #define ___bpf_ctx_decl0() 736 #define ___bpf_ctx_decl1(t, x) , t x 737 #define ___bpf_ctx_decl2(t, x, args...) , t x ___bpf_ctx_decl1(args) 738 #define ___bpf_ctx_decl3(t, x, args...) , t x ___bpf_ctx_decl2(args) 739 #define ___bpf_ctx_decl4(t, x, args...) , t x ___bpf_ctx_decl3(args) 740 #define ___bpf_ctx_decl5(t, x, args...) , t x ___bpf_ctx_decl4(args) 741 #define ___bpf_ctx_decl6(t, x, args...) , t x ___bpf_ctx_decl5(args) 742 #define ___bpf_ctx_decl7(t, x, args...) , t x ___bpf_ctx_decl6(args) 743 #define ___bpf_ctx_decl8(t, x, args...) , t x ___bpf_ctx_decl7(args) 744 #define ___bpf_ctx_decl9(t, x, args...) , t x ___bpf_ctx_decl8(args) 745 #define ___bpf_ctx_decl10(t, x, args...) , t x ___bpf_ctx_decl9(args) 746 #define ___bpf_ctx_decl11(t, x, args...) , t x ___bpf_ctx_decl10(args) 747 #define ___bpf_ctx_decl12(t, x, args...) , t x ___bpf_ctx_decl11(args) 748 #define ___bpf_ctx_decl(args...) ___bpf_apply(___bpf_ctx_decl, ___bpf_narg2(args))(args) 749 750 /* 751 * BPF_PROG2 is an enhanced version of BPF_PROG in order to handle struct 752 * arguments. Since each struct argument might take one or two u64 values 753 * in the trampoline stack, argument type size is needed to place proper number 754 * of u64 values for each argument. Therefore, BPF_PROG2 has different 755 * syntax from BPF_PROG. For example, for the following BPF_PROG syntax: 756 * 757 * int BPF_PROG(test2, int a, int b) { ... } 758 * 759 * the corresponding BPF_PROG2 syntax is: 760 * 761 * int BPF_PROG2(test2, int, a, int, b) { ... } 762 * 763 * where type and the corresponding argument name are separated by comma. 764 * 765 * Use BPF_PROG2 macro if one of the arguments might be a struct/union larger 766 * than 8 bytes: 767 * 768 * int BPF_PROG2(test_struct_arg, struct bpf_testmod_struct_arg_1, a, int, b, 769 * int, c, int, d, struct bpf_testmod_struct_arg_2, e, int, ret) 770 * { 771 * // access a, b, c, d, e, and ret directly 772 * ... 773 * } 774 */ 775 #define BPF_PROG2(name, args...) \ 776 name(unsigned long long *ctx); \ 777 static __always_inline typeof(name(0)) \ 778 ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)); \ 779 typeof(name(0)) name(unsigned long long *ctx) \ 780 { \ 781 return ____##name(ctx ___bpf_ctx_arg(args)); \ 782 } \ 783 static __always_inline typeof(name(0)) \ 784 ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)) 785 786 struct pt_regs; 787 788 #define ___bpf_kprobe_args0() ctx 789 #define ___bpf_kprobe_args1(x) ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx) 790 #define ___bpf_kprobe_args2(x, args...) ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx) 791 #define ___bpf_kprobe_args3(x, args...) ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx) 792 #define ___bpf_kprobe_args4(x, args...) ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx) 793 #define ___bpf_kprobe_args5(x, args...) ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx) 794 #define ___bpf_kprobe_args6(x, args...) ___bpf_kprobe_args5(args), (void *)PT_REGS_PARM6(ctx) 795 #define ___bpf_kprobe_args7(x, args...) ___bpf_kprobe_args6(args), (void *)PT_REGS_PARM7(ctx) 796 #define ___bpf_kprobe_args8(x, args...) ___bpf_kprobe_args7(args), (void *)PT_REGS_PARM8(ctx) 797 #define ___bpf_kprobe_args(args...) ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args) 798 799 /* 800 * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for 801 * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific 802 * low-level way of getting kprobe input arguments from struct pt_regs, and 803 * provides a familiar typed and named function arguments syntax and 804 * semantics of accessing kprobe input paremeters. 805 * 806 * Original struct pt_regs* context is preserved as 'ctx' argument. This might 807 * be necessary when using BPF helpers like bpf_perf_event_output(). 808 */ 809 #define BPF_KPROBE(name, args...) \ 810 name(struct pt_regs *ctx); \ 811 static __always_inline typeof(name(0)) \ 812 ____##name(struct pt_regs *ctx, ##args); \ 813 typeof(name(0)) name(struct pt_regs *ctx) \ 814 { \ 815 _Pragma("GCC diagnostic push") \ 816 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 817 return ____##name(___bpf_kprobe_args(args)); \ 818 _Pragma("GCC diagnostic pop") \ 819 } \ 820 static __always_inline typeof(name(0)) \ 821 ____##name(struct pt_regs *ctx, ##args) 822 823 #define ___bpf_kretprobe_args0() ctx 824 #define ___bpf_kretprobe_args1(x) ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx) 825 #define ___bpf_kretprobe_args(args...) ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args) 826 827 /* 828 * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional 829 * return value (in addition to `struct pt_regs *ctx`), but no input 830 * arguments, because they will be clobbered by the time probed function 831 * returns. 832 */ 833 #define BPF_KRETPROBE(name, args...) \ 834 name(struct pt_regs *ctx); \ 835 static __always_inline typeof(name(0)) \ 836 ____##name(struct pt_regs *ctx, ##args); \ 837 typeof(name(0)) name(struct pt_regs *ctx) \ 838 { \ 839 _Pragma("GCC diagnostic push") \ 840 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 841 return ____##name(___bpf_kretprobe_args(args)); \ 842 _Pragma("GCC diagnostic pop") \ 843 } \ 844 static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) 845 846 /* If kernel has CONFIG_ARCH_HAS_SYSCALL_WRAPPER, read pt_regs directly */ 847 #define ___bpf_syscall_args0() ctx 848 #define ___bpf_syscall_args1(x) ___bpf_syscall_args0(), (void *)PT_REGS_PARM1_SYSCALL(regs) 849 #define ___bpf_syscall_args2(x, args...) ___bpf_syscall_args1(args), (void *)PT_REGS_PARM2_SYSCALL(regs) 850 #define ___bpf_syscall_args3(x, args...) ___bpf_syscall_args2(args), (void *)PT_REGS_PARM3_SYSCALL(regs) 851 #define ___bpf_syscall_args4(x, args...) ___bpf_syscall_args3(args), (void *)PT_REGS_PARM4_SYSCALL(regs) 852 #define ___bpf_syscall_args5(x, args...) ___bpf_syscall_args4(args), (void *)PT_REGS_PARM5_SYSCALL(regs) 853 #define ___bpf_syscall_args6(x, args...) ___bpf_syscall_args5(args), (void *)PT_REGS_PARM6_SYSCALL(regs) 854 #define ___bpf_syscall_args7(x, args...) ___bpf_syscall_args6(args), (void *)PT_REGS_PARM7_SYSCALL(regs) 855 #define ___bpf_syscall_args(args...) ___bpf_apply(___bpf_syscall_args, ___bpf_narg(args))(args) 856 857 /* If kernel doesn't have CONFIG_ARCH_HAS_SYSCALL_WRAPPER, we have to BPF_CORE_READ from pt_regs */ 858 #define ___bpf_syswrap_args0() ctx 859 #define ___bpf_syswrap_args1(x) ___bpf_syswrap_args0(), (void *)PT_REGS_PARM1_CORE_SYSCALL(regs) 860 #define ___bpf_syswrap_args2(x, args...) ___bpf_syswrap_args1(args), (void *)PT_REGS_PARM2_CORE_SYSCALL(regs) 861 #define ___bpf_syswrap_args3(x, args...) ___bpf_syswrap_args2(args), (void *)PT_REGS_PARM3_CORE_SYSCALL(regs) 862 #define ___bpf_syswrap_args4(x, args...) ___bpf_syswrap_args3(args), (void *)PT_REGS_PARM4_CORE_SYSCALL(regs) 863 #define ___bpf_syswrap_args5(x, args...) ___bpf_syswrap_args4(args), (void *)PT_REGS_PARM5_CORE_SYSCALL(regs) 864 #define ___bpf_syswrap_args6(x, args...) ___bpf_syswrap_args5(args), (void *)PT_REGS_PARM6_CORE_SYSCALL(regs) 865 #define ___bpf_syswrap_args7(x, args...) ___bpf_syswrap_args6(args), (void *)PT_REGS_PARM7_CORE_SYSCALL(regs) 866 #define ___bpf_syswrap_args(args...) ___bpf_apply(___bpf_syswrap_args, ___bpf_narg(args))(args) 867 868 /* 869 * BPF_KSYSCALL is a variant of BPF_KPROBE, which is intended for 870 * tracing syscall functions, like __x64_sys_close. It hides the underlying 871 * platform-specific low-level way of getting syscall input arguments from 872 * struct pt_regs, and provides a familiar typed and named function arguments 873 * syntax and semantics of accessing syscall input parameters. 874 * 875 * Original struct pt_regs * context is preserved as 'ctx' argument. This might 876 * be necessary when using BPF helpers like bpf_perf_event_output(). 877 * 878 * At the moment BPF_KSYSCALL does not transparently handle all the calling 879 * convention quirks for the following syscalls: 880 * 881 * - mmap(): __ARCH_WANT_SYS_OLD_MMAP. 882 * - clone(): CONFIG_CLONE_BACKWARDS, CONFIG_CLONE_BACKWARDS2 and 883 * CONFIG_CLONE_BACKWARDS3. 884 * - socket-related syscalls: __ARCH_WANT_SYS_SOCKETCALL. 885 * - compat syscalls. 886 * 887 * This may or may not change in the future. User needs to take extra measures 888 * to handle such quirks explicitly, if necessary. 889 * 890 * This macro relies on BPF CO-RE support and virtual __kconfig externs. 891 */ 892 #define BPF_KSYSCALL(name, args...) \ 893 name(struct pt_regs *ctx); \ 894 extern _Bool LINUX_HAS_SYSCALL_WRAPPER __kconfig; \ 895 static __always_inline typeof(name(0)) \ 896 ____##name(struct pt_regs *ctx, ##args); \ 897 typeof(name(0)) name(struct pt_regs *ctx) \ 898 { \ 899 struct pt_regs *regs = LINUX_HAS_SYSCALL_WRAPPER \ 900 ? (struct pt_regs *)PT_REGS_PARM1(ctx) \ 901 : ctx; \ 902 _Pragma("GCC diagnostic push") \ 903 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 904 if (LINUX_HAS_SYSCALL_WRAPPER) \ 905 return ____##name(___bpf_syswrap_args(args)); \ 906 else \ 907 return ____##name(___bpf_syscall_args(args)); \ 908 _Pragma("GCC diagnostic pop") \ 909 } \ 910 static __always_inline typeof(name(0)) \ 911 ____##name(struct pt_regs *ctx, ##args) 912 913 #define BPF_KPROBE_SYSCALL BPF_KSYSCALL 914 915 /* BPF_UPROBE and BPF_URETPROBE are identical to BPF_KPROBE and BPF_KRETPROBE, 916 * but are named way less confusingly for SEC("uprobe") and SEC("uretprobe") 917 * use cases. 918 */ 919 #define BPF_UPROBE(name, args...) BPF_KPROBE(name, ##args) 920 #define BPF_URETPROBE(name, args...) BPF_KRETPROBE(name, ##args) 921 922 #endif 923