| | 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 | } __attribute__((preserve_access_index)); |
| | 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) (((const struct pt_regs___s390 *)(x))->__PT_PARM1_SYSCALL_REG) |
| | 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 | } __attribute__((preserve_access_index)); |
| | 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) (((const struct pt_regs___arm64 *)(x))->__PT_PARM1_SYSCALL_REG) |
| | 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 | struct pt_regs___riscv { |
| | 355 | unsigned long orig_a0; |
| | 356 | } __attribute__((preserve_access_index)); |
| | 357 | |
| | 358 | /* riscv provides struct user_regs_struct instead of struct pt_regs to userspace */ |
| | 359 | #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) |
| | 360 | #define __PT_PARM1_REG a0 |
| | 361 | #define __PT_PARM2_REG a1 |
| | 362 | #define __PT_PARM3_REG a2 |
| | 363 | #define __PT_PARM4_REG a3 |
| | 364 | #define __PT_PARM5_REG a4 |
| | 365 | #define __PT_PARM6_REG a5 |
| | 366 | #define __PT_PARM7_REG a6 |
| | 367 | #define __PT_PARM8_REG a7 |
| | 368 | |
| | 369 | #define __PT_PARM1_SYSCALL_REG orig_a0 |
| | 370 | #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG |
| | 371 | #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG |
| | 372 | #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG |
| | 373 | #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG |
| | 374 | #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG |
| | 375 | #define PT_REGS_PARM1_SYSCALL(x) (((const struct pt_regs___riscv *)(x))->__PT_PARM1_SYSCALL_REG) |
| | 376 | #define PT_REGS_PARM1_CORE_SYSCALL(x) \ |
| | 377 | BPF_CORE_READ((const struct pt_regs___riscv *)(x), __PT_PARM1_SYSCALL_REG) |
| | 378 | |
| | 379 | #define __PT_RET_REG ra |
| | 380 | #define __PT_FP_REG s0 |
| | 381 | #define __PT_RC_REG a0 |
| | 382 | #define __PT_SP_REG sp |
| | 383 | #define __PT_IP_REG pc |
| | 384 | |
| | 385 | #elif defined(bpf_target_arc) |
| | 386 | |
| | 387 | /* |
| | 388 | * Section "Function Calling Sequence" (page 24): |
| | 389 | * https://raw.githubusercontent.com/wiki/foss-for-synopsys-dwc-arc-processors/toolchain/files/ARCv2_ABI.pdf |
| | 390 | */ |
| | 391 | |
| | 392 | /* arc provides struct user_regs_struct instead of struct pt_regs to userspace */ |
| | 393 | #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) |
| | 394 | #define __PT_PARM1_REG scratch.r0 |
| | 395 | #define __PT_PARM2_REG scratch.r1 |
| | 396 | #define __PT_PARM3_REG scratch.r2 |
| | 397 | #define __PT_PARM4_REG scratch.r3 |
| | 398 | #define __PT_PARM5_REG scratch.r4 |
| | 399 | #define __PT_PARM6_REG scratch.r5 |
| | 400 | #define __PT_PARM7_REG scratch.r6 |
| | 401 | #define __PT_PARM8_REG scratch.r7 |
| | 402 | |
| | 403 | /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
| | 404 | #define PT_REGS_SYSCALL_REGS(ctx) ctx |
| | 405 | #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG |
| | 406 | #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG |
| | 407 | #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG |
| | 408 | #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG |
| | 409 | #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG |
| | 410 | #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG |
| | 411 | |
| | 412 | #define __PT_RET_REG scratch.blink |
| | 413 | #define __PT_FP_REG scratch.fp |
| | 414 | #define __PT_RC_REG scratch.r0 |
| | 415 | #define __PT_SP_REG scratch.sp |
| | 416 | #define __PT_IP_REG scratch.ret |
| | 417 | |
| | 418 | #elif defined(bpf_target_loongarch) |
| | 419 | |
| | 420 | /* |
| | 421 | * https://docs.kernel.org/loongarch/introduction.html |
| | 422 | * https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html |
| | 423 | */ |
| | 424 | |
| | 425 | /* loongarch provides struct user_pt_regs instead of struct pt_regs to userspace */ |
| | 426 | #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) |
| | 427 | #define __PT_PARM1_REG regs[4] |
| | 428 | #define __PT_PARM2_REG regs[5] |
| | 429 | #define __PT_PARM3_REG regs[6] |
| | 430 | #define __PT_PARM4_REG regs[7] |
| | 431 | #define __PT_PARM5_REG regs[8] |
| | 432 | #define __PT_PARM6_REG regs[9] |
| | 433 | #define __PT_PARM7_REG regs[10] |
| | 434 | #define __PT_PARM8_REG regs[11] |
| | 435 | |
| | 436 | /* loongarch does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
| | 437 | #define PT_REGS_SYSCALL_REGS(ctx) ctx |
| | 438 | #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG |
| | 439 | #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG |
| | 440 | #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG |
| | 441 | #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG |
| | 442 | #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG |
| | 443 | #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG |
| | 444 | |
| | 445 | #define __PT_RET_REG regs[1] |
| | 446 | #define __PT_FP_REG regs[22] |
| | 447 | #define __PT_RC_REG regs[4] |
| | 448 | #define __PT_SP_REG regs[3] |
| | 449 | #define __PT_IP_REG csr_era |
| | 450 | |
| | 451 | #endif |
| | 452 | |
| | 453 | #if defined(bpf_target_defined) |
| | 454 | |
| | 455 | struct pt_regs; |
| | 456 | |
| | 457 | /* allow some architectures to override `struct pt_regs` */ |
| | 458 | #ifndef __PT_REGS_CAST |
| | 459 | #define __PT_REGS_CAST(x) (x) |
| | 460 | #endif |
| | 461 | |
| | 462 | /* |
| | 463 | * Different architectures support different number of arguments passed |
| | 464 | * through registers. i386 supports just 3, some arches support up to 8. |
| | 465 | */ |
| | 466 | #ifndef __PT_PARM4_REG |
| | 467 | #define __PT_PARM4_REG __unsupported__ |
| | 468 | #endif |
| | 469 | #ifndef __PT_PARM5_REG |
| | 470 | #define __PT_PARM5_REG __unsupported__ |
| | 471 | #endif |
| | 472 | #ifndef __PT_PARM6_REG |
| | 473 | #define __PT_PARM6_REG __unsupported__ |
| | 474 | #endif |
| | 475 | #ifndef __PT_PARM7_REG |
| | 476 | #define __PT_PARM7_REG __unsupported__ |
| | 477 | #endif |
| | 478 | #ifndef __PT_PARM8_REG |
| | 479 | #define __PT_PARM8_REG __unsupported__ |
| | 480 | #endif |
| | 481 | /* |
| | 482 | * Similarly, syscall-specific conventions might differ between function call |
| | 483 | * conventions within each architecture. All supported architectures pass |
| | 484 | * either 6 or 7 syscall arguments in registers. |
| | 485 | * |
| | 486 | * See syscall(2) manpage for succinct table with information on each arch. |
| | 487 | */ |
| | 488 | #ifndef __PT_PARM7_SYSCALL_REG |
| | 489 | #define __PT_PARM7_SYSCALL_REG __unsupported__ |
| | 490 | #endif |
| | 491 | |
| | 492 | #define PT_REGS_PARM1(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG) |
| | 493 | #define PT_REGS_PARM2(x) (__PT_REGS_CAST(x)->__PT_PARM2_REG) |
| | 494 | #define PT_REGS_PARM3(x) (__PT_REGS_CAST(x)->__PT_PARM3_REG) |
| | 495 | #define PT_REGS_PARM4(x) (__PT_REGS_CAST(x)->__PT_PARM4_REG) |
| | 496 | #define PT_REGS_PARM5(x) (__PT_REGS_CAST(x)->__PT_PARM5_REG) |
| | 497 | #define PT_REGS_PARM6(x) (__PT_REGS_CAST(x)->__PT_PARM6_REG) |
| | 498 | #define PT_REGS_PARM7(x) (__PT_REGS_CAST(x)->__PT_PARM7_REG) |
| | 499 | #define PT_REGS_PARM8(x) (__PT_REGS_CAST(x)->__PT_PARM8_REG) |
| | 500 | #define PT_REGS_RET(x) (__PT_REGS_CAST(x)->__PT_RET_REG) |
| | 501 | #define PT_REGS_FP(x) (__PT_REGS_CAST(x)->__PT_FP_REG) |
| | 502 | #define PT_REGS_RC(x) (__PT_REGS_CAST(x)->__PT_RC_REG) |
| | 503 | #define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG) |
| | 504 | #define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG) |
| | 505 | |
| | 506 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_REG) |
| | 507 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_REG) |
| | 508 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_REG) |
| | 509 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_REG) |
| | 510 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_REG) |
| | 511 | #define PT_REGS_PARM6_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM6_REG) |
| | 512 | #define PT_REGS_PARM7_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM7_REG) |
| | 513 | #define PT_REGS_PARM8_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM8_REG) |
| | 514 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RET_REG) |
| | 515 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_FP_REG) |
| | 516 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RC_REG) |
| | 517 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_SP_REG) |
| | 518 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_IP_REG) |
| | 519 | |
| | 520 | #if defined(bpf_target_powerpc) |
| | 521 | |
| | 522 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) |
| | 523 | #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP |
| | 524 | |
| | 525 | #elif defined(bpf_target_sparc) || defined(bpf_target_arm64) |
| | 526 | |
| | 527 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) |
| | 528 | #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP |
| | 529 | |
| | 530 | #else |
| | 531 | |
| | 532 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) \ |
| | 533 | ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) |
| | 534 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ |
| | 535 | ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) |
| | 536 | |
| | 537 | #endif |
| | 538 | |
| | 539 | #ifndef PT_REGS_PARM1_SYSCALL |
| | 540 | #define PT_REGS_PARM1_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM1_SYSCALL_REG) |
| | 541 | #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_SYSCALL_REG) |
| | 542 | #endif |
| | 543 | #ifndef PT_REGS_PARM2_SYSCALL |
| | 544 | #define PT_REGS_PARM2_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM2_SYSCALL_REG) |
| | 545 | #define PT_REGS_PARM2_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_SYSCALL_REG) |
| | 546 | #endif |
| | 547 | #ifndef PT_REGS_PARM3_SYSCALL |
| | 548 | #define PT_REGS_PARM3_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM3_SYSCALL_REG) |
| | 549 | #define PT_REGS_PARM3_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_SYSCALL_REG) |
| | 550 | #endif |
| | 551 | #ifndef PT_REGS_PARM4_SYSCALL |
| | 552 | #define PT_REGS_PARM4_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM4_SYSCALL_REG) |
| | 553 | #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_SYSCALL_REG) |
| | 554 | #endif |
| | 555 | #ifndef PT_REGS_PARM5_SYSCALL |
| | 556 | #define PT_REGS_PARM5_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM5_SYSCALL_REG) |
| | 557 | #define PT_REGS_PARM5_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_SYSCALL_REG) |
| | 558 | #endif |
| | 559 | #ifndef PT_REGS_PARM6_SYSCALL |
| | 560 | #define PT_REGS_PARM6_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM6_SYSCALL_REG) |
| | 561 | #define PT_REGS_PARM6_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM6_SYSCALL_REG) |
| | 562 | #endif |
| | 563 | #ifndef PT_REGS_PARM7_SYSCALL |
| | 564 | #define PT_REGS_PARM7_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM7_SYSCALL_REG) |
| | 565 | #define PT_REGS_PARM7_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM7_SYSCALL_REG) |
| | 566 | #endif |
| | 567 | |
| | 568 | #else /* defined(bpf_target_defined) */ |
| | 569 | |
| | 570 | #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 571 | #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 572 | #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 573 | #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 574 | #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 575 | #define PT_REGS_PARM6(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 576 | #define PT_REGS_PARM7(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 577 | #define PT_REGS_PARM8(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 578 | #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 579 | #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 580 | #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 581 | #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 582 | #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 583 | |
| | 584 | #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 585 | #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 586 | #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 587 | #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 588 | #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 589 | #define PT_REGS_PARM6_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 590 | #define PT_REGS_PARM7_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 591 | #define PT_REGS_PARM8_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 592 | #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 593 | #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 594 | #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 595 | #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 596 | #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 597 | |
| | 598 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 599 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 600 | |
| | 601 | #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 602 | #define PT_REGS_PARM2_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 603 | #define PT_REGS_PARM3_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 604 | #define PT_REGS_PARM4_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 605 | #define PT_REGS_PARM5_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 606 | #define PT_REGS_PARM6_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 607 | #define PT_REGS_PARM7_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 608 | |
| | 609 | #define PT_REGS_PARM1_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 610 | #define PT_REGS_PARM2_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 611 | #define PT_REGS_PARM3_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 612 | #define PT_REGS_PARM4_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 613 | #define PT_REGS_PARM5_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 614 | #define PT_REGS_PARM6_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 615 | #define PT_REGS_PARM7_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| | 616 | |
| | 617 | #endif /* defined(bpf_target_defined) */ |
| | 618 | |
| | 619 | /* |
| | 620 | * When invoked from a syscall handler kprobe, returns a pointer to a |
| | 621 | * struct pt_regs containing syscall arguments and suitable for passing to |
| | 622 | * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL(). |
| | 623 | */ |
| | 624 | #ifndef PT_REGS_SYSCALL_REGS |
| | 625 | /* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */ |
| | 626 | #define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx)) |
| | 627 | #endif |
| | 628 | |
| | 629 | #ifndef ___bpf_concat |
| | 630 | #define ___bpf_concat(a, b) a ## b |
| | 631 | #endif |
| | 632 | #ifndef ___bpf_apply |
| | 633 | #define ___bpf_apply(fn, n) ___bpf_concat(fn, n) |
| | 634 | #endif |
| | 635 | #ifndef ___bpf_nth |
| | 636 | #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N |
| | 637 | #endif |
| | 638 | #ifndef ___bpf_narg |
| | 639 | #define ___bpf_narg(...) ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) |
| | 640 | #endif |
| | 641 | |
| | 642 | #define ___bpf_ctx_cast0() ctx |
| | 643 | #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), ctx[0] |
| | 644 | #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), ctx[1] |
| | 645 | #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), ctx[2] |
| | 646 | #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), ctx[3] |
| | 647 | #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), ctx[4] |
| | 648 | #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), ctx[5] |
| | 649 | #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), ctx[6] |
| | 650 | #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), ctx[7] |
| | 651 | #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), ctx[8] |
| | 652 | #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), ctx[9] |
| | 653 | #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), ctx[10] |
| | 654 | #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), ctx[11] |
| | 655 | #define ___bpf_ctx_cast(args...) ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) |
| | 656 | |
| | 657 | /* |
| | 658 | * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and |
| | 659 | * similar kinds of BPF programs, that accept input arguments as a single |
| | 660 | * pointer to untyped u64 array, where each u64 can actually be a typed |
| | 661 | * pointer or integer of different size. Instead of requiring user to write |
| | 662 | * manual casts and work with array elements by index, BPF_PROG macro |
| | 663 | * allows user to declare a list of named and typed input arguments in the |
| | 664 | * same syntax as for normal C function. All the casting is hidden and |
| | 665 | * performed transparently, while user code can just assume working with |
| | 666 | * function arguments of specified type and name. |
| | 667 | * |
| | 668 | * Original raw context argument is preserved as well as 'ctx' argument. |
| | 669 | * This is useful when using BPF helpers that expect original context |
| | 670 | * as one of the parameters (e.g., for bpf_perf_event_output()). |
| | 671 | */ |
| | 672 | #define BPF_PROG(name, args...) \ |
| | 673 | name(unsigned long long *ctx); \ |
| | 674 | static __always_inline typeof(name(0)) \ |
| | 675 | ____##name(unsigned long long *ctx, ##args); \ |
| | 676 | typeof(name(0)) name(unsigned long long *ctx) \ |
| | 677 | { \ |
| | 678 | _Pragma("GCC diagnostic push") \ |
| | 679 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| | 680 | return ____##name(___bpf_ctx_cast(args)); \ |
| | 681 | _Pragma("GCC diagnostic pop") \ |
| | 682 | } \ |
| | 683 | static __always_inline typeof(name(0)) \ |
| | 684 | ____##name(unsigned long long *ctx, ##args) |
| | 685 | |
| | 686 | #ifndef ___bpf_nth2 |
| | 687 | #define ___bpf_nth2(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, \ |
| | 688 | _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, N, ...) N |
| | 689 | #endif |
| | 690 | #ifndef ___bpf_narg2 |
| | 691 | #define ___bpf_narg2(...) \ |
| | 692 | ___bpf_nth2(_, ##__VA_ARGS__, 12, 12, 11, 11, 10, 10, 9, 9, 8, 8, 7, 7, \ |
| | 693 | 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0) |
| | 694 | #endif |
| | 695 | |
| | 696 | #define ___bpf_treg_cnt(t) \ |
| | 697 | __builtin_choose_expr(sizeof(t) == 1, 1, \ |
| | 698 | __builtin_choose_expr(sizeof(t) == 2, 1, \ |
| | 699 | __builtin_choose_expr(sizeof(t) == 4, 1, \ |
| | 700 | __builtin_choose_expr(sizeof(t) == 8, 1, \ |
| | 701 | __builtin_choose_expr(sizeof(t) == 16, 2, \ |
| | 702 | (void)0))))) |
| | 703 | |
| | 704 | #define ___bpf_reg_cnt0() (0) |
| | 705 | #define ___bpf_reg_cnt1(t, x) (___bpf_reg_cnt0() + ___bpf_treg_cnt(t)) |
| | 706 | #define ___bpf_reg_cnt2(t, x, args...) (___bpf_reg_cnt1(args) + ___bpf_treg_cnt(t)) |
| | 707 | #define ___bpf_reg_cnt3(t, x, args...) (___bpf_reg_cnt2(args) + ___bpf_treg_cnt(t)) |
| | 708 | #define ___bpf_reg_cnt4(t, x, args...) (___bpf_reg_cnt3(args) + ___bpf_treg_cnt(t)) |
| | 709 | #define ___bpf_reg_cnt5(t, x, args...) (___bpf_reg_cnt4(args) + ___bpf_treg_cnt(t)) |
| | 710 | #define ___bpf_reg_cnt6(t, x, args...) (___bpf_reg_cnt5(args) + ___bpf_treg_cnt(t)) |
| | 711 | #define ___bpf_reg_cnt7(t, x, args...) (___bpf_reg_cnt6(args) + ___bpf_treg_cnt(t)) |
| | 712 | #define ___bpf_reg_cnt8(t, x, args...) (___bpf_reg_cnt7(args) + ___bpf_treg_cnt(t)) |
| | 713 | #define ___bpf_reg_cnt9(t, x, args...) (___bpf_reg_cnt8(args) + ___bpf_treg_cnt(t)) |
| | 714 | #define ___bpf_reg_cnt10(t, x, args...) (___bpf_reg_cnt9(args) + ___bpf_treg_cnt(t)) |
| | 715 | #define ___bpf_reg_cnt11(t, x, args...) (___bpf_reg_cnt10(args) + ___bpf_treg_cnt(t)) |
| | 716 | #define ___bpf_reg_cnt12(t, x, args...) (___bpf_reg_cnt11(args) + ___bpf_treg_cnt(t)) |
| | 717 | #define ___bpf_reg_cnt(args...) ___bpf_apply(___bpf_reg_cnt, ___bpf_narg2(args))(args) |
| | 718 | |
| | 719 | #define ___bpf_union_arg(t, x, n) \ |
| | 720 | __builtin_choose_expr(sizeof(t) == 1, ({ union { __u8 z[1]; t x; } ___t = { .z = {ctx[n]}}; ___t.x; }), \ |
| | 721 | __builtin_choose_expr(sizeof(t) == 2, ({ union { __u16 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ |
| | 722 | __builtin_choose_expr(sizeof(t) == 4, ({ union { __u32 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ |
| | 723 | __builtin_choose_expr(sizeof(t) == 8, ({ union { __u64 z[1]; t x; } ___t = {.z = {ctx[n]} }; ___t.x; }), \ |
| | 724 | __builtin_choose_expr(sizeof(t) == 16, ({ union { __u64 z[2]; t x; } ___t = {.z = {ctx[n], ctx[n + 1]} }; ___t.x; }), \ |
| | 725 | (void)0))))) |
| | 726 | |
| | 727 | #define ___bpf_ctx_arg0(n, args...) |
| | 728 | #define ___bpf_ctx_arg1(n, t, x) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt1(t, x)) |
| | 729 | #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) |
| | 730 | #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) |
| | 731 | #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) |
| | 732 | #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) |
| | 733 | #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) |
| | 734 | #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) |
| | 735 | #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) |
| | 736 | #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) |
| | 737 | #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) |
| | 738 | #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) |
| | 739 | #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) |
| | 740 | #define ___bpf_ctx_arg(args...) ___bpf_apply(___bpf_ctx_arg, ___bpf_narg2(args))(___bpf_reg_cnt(args), args) |
| | 741 | |
| | 742 | #define ___bpf_ctx_decl0() |
| | 743 | #define ___bpf_ctx_decl1(t, x) , t x |
| | 744 | #define ___bpf_ctx_decl2(t, x, args...) , t x ___bpf_ctx_decl1(args) |
| | 745 | #define ___bpf_ctx_decl3(t, x, args...) , t x ___bpf_ctx_decl2(args) |
| | 746 | #define ___bpf_ctx_decl4(t, x, args...) , t x ___bpf_ctx_decl3(args) |
| | 747 | #define ___bpf_ctx_decl5(t, x, args...) , t x ___bpf_ctx_decl4(args) |
| | 748 | #define ___bpf_ctx_decl6(t, x, args...) , t x ___bpf_ctx_decl5(args) |
| | 749 | #define ___bpf_ctx_decl7(t, x, args...) , t x ___bpf_ctx_decl6(args) |
| | 750 | #define ___bpf_ctx_decl8(t, x, args...) , t x ___bpf_ctx_decl7(args) |
| | 751 | #define ___bpf_ctx_decl9(t, x, args...) , t x ___bpf_ctx_decl8(args) |
| | 752 | #define ___bpf_ctx_decl10(t, x, args...) , t x ___bpf_ctx_decl9(args) |
| | 753 | #define ___bpf_ctx_decl11(t, x, args...) , t x ___bpf_ctx_decl10(args) |
| | 754 | #define ___bpf_ctx_decl12(t, x, args...) , t x ___bpf_ctx_decl11(args) |
| | 755 | #define ___bpf_ctx_decl(args...) ___bpf_apply(___bpf_ctx_decl, ___bpf_narg2(args))(args) |
| | 756 | |
| | 757 | /* |
| | 758 | * BPF_PROG2 is an enhanced version of BPF_PROG in order to handle struct |
| | 759 | * arguments. Since each struct argument might take one or two u64 values |
| | 760 | * in the trampoline stack, argument type size is needed to place proper number |
| | 761 | * of u64 values for each argument. Therefore, BPF_PROG2 has different |
| | 762 | * syntax from BPF_PROG. For example, for the following BPF_PROG syntax: |
| | 763 | * |
| | 764 | * int BPF_PROG(test2, int a, int b) { ... } |
| | 765 | * |
| | 766 | * the corresponding BPF_PROG2 syntax is: |
| | 767 | * |
| | 768 | * int BPF_PROG2(test2, int, a, int, b) { ... } |
| | 769 | * |
| | 770 | * where type and the corresponding argument name are separated by comma. |
| | 771 | * |
| | 772 | * Use BPF_PROG2 macro if one of the arguments might be a struct/union larger |
| | 773 | * than 8 bytes: |
| | 774 | * |
| | 775 | * int BPF_PROG2(test_struct_arg, struct bpf_testmod_struct_arg_1, a, int, b, |
| | 776 | * int, c, int, d, struct bpf_testmod_struct_arg_2, e, int, ret) |
| | 777 | * { |
| | 778 | * // access a, b, c, d, e, and ret directly |
| | 779 | * ... |
| | 780 | * } |
| | 781 | */ |
| | 782 | #define BPF_PROG2(name, args...) \ |
| | 783 | name(unsigned long long *ctx); \ |
| | 784 | static __always_inline typeof(name(0)) \ |
| | 785 | ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)); \ |
| | 786 | typeof(name(0)) name(unsigned long long *ctx) \ |
| | 787 | { \ |
| | 788 | return ____##name(ctx ___bpf_ctx_arg(args)); \ |
| | 789 | } \ |
| | 790 | static __always_inline typeof(name(0)) \ |
| | 791 | ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)) |
| | 792 | |
| | 793 | struct pt_regs; |
| | 794 | |
| | 795 | #define ___bpf_kprobe_args0() ctx |
| | 796 | #define ___bpf_kprobe_args1(x) ___bpf_kprobe_args0(), (unsigned long long)PT_REGS_PARM1(ctx) |
| | 797 | #define ___bpf_kprobe_args2(x, args...) ___bpf_kprobe_args1(args), (unsigned long long)PT_REGS_PARM2(ctx) |
| | 798 | #define ___bpf_kprobe_args3(x, args...) ___bpf_kprobe_args2(args), (unsigned long long)PT_REGS_PARM3(ctx) |
| | 799 | #define ___bpf_kprobe_args4(x, args...) ___bpf_kprobe_args3(args), (unsigned long long)PT_REGS_PARM4(ctx) |
| | 800 | #define ___bpf_kprobe_args5(x, args...) ___bpf_kprobe_args4(args), (unsigned long long)PT_REGS_PARM5(ctx) |
| | 801 | #define ___bpf_kprobe_args6(x, args...) ___bpf_kprobe_args5(args), (unsigned long long)PT_REGS_PARM6(ctx) |
| | 802 | #define ___bpf_kprobe_args7(x, args...) ___bpf_kprobe_args6(args), (unsigned long long)PT_REGS_PARM7(ctx) |
| | 803 | #define ___bpf_kprobe_args8(x, args...) ___bpf_kprobe_args7(args), (unsigned long long)PT_REGS_PARM8(ctx) |
| | 804 | #define ___bpf_kprobe_args(args...) ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args) |
| | 805 | |
| | 806 | /* |
| | 807 | * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for |
| | 808 | * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific |
| | 809 | * low-level way of getting kprobe input arguments from struct pt_regs, and |
| | 810 | * provides a familiar typed and named function arguments syntax and |
| | 811 | * semantics of accessing kprobe input parameters. |
| | 812 | * |
| | 813 | * Original struct pt_regs* context is preserved as 'ctx' argument. This might |
| | 814 | * be necessary when using BPF helpers like bpf_perf_event_output(). |
| | 815 | */ |
| | 816 | #define BPF_KPROBE(name, args...) \ |
| | 817 | name(struct pt_regs *ctx); \ |
| | 818 | static __always_inline typeof(name(0)) \ |
| | 819 | ____##name(struct pt_regs *ctx, ##args); \ |
| | 820 | typeof(name(0)) name(struct pt_regs *ctx) \ |
| | 821 | { \ |
| | 822 | _Pragma("GCC diagnostic push") \ |
| | 823 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| | 824 | return ____##name(___bpf_kprobe_args(args)); \ |
| | 825 | _Pragma("GCC diagnostic pop") \ |
| | 826 | } \ |
| | 827 | static __always_inline typeof(name(0)) \ |
| | 828 | ____##name(struct pt_regs *ctx, ##args) |
| | 829 | |
| | 830 | #define ___bpf_kretprobe_args0() ctx |
| | 831 | #define ___bpf_kretprobe_args1(x) ___bpf_kretprobe_args0(), (unsigned long long)PT_REGS_RC(ctx) |
| | 832 | #define ___bpf_kretprobe_args(args...) ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args) |
| | 833 | |
| | 834 | /* |
| | 835 | * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional |
| | 836 | * return value (in addition to `struct pt_regs *ctx`), but no input |
| | 837 | * arguments, because they will be clobbered by the time probed function |
| | 838 | * returns. |
| | 839 | */ |
| | 840 | #define BPF_KRETPROBE(name, args...) \ |
| | 841 | name(struct pt_regs *ctx); \ |
| | 842 | static __always_inline typeof(name(0)) \ |
| | 843 | ____##name(struct pt_regs *ctx, ##args); \ |
| | 844 | typeof(name(0)) name(struct pt_regs *ctx) \ |
| | 845 | { \ |
| | 846 | _Pragma("GCC diagnostic push") \ |
| | 847 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| | 848 | return ____##name(___bpf_kretprobe_args(args)); \ |
| | 849 | _Pragma("GCC diagnostic pop") \ |
| | 850 | } \ |
| | 851 | static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) |
| | 852 | |
| | 853 | /* If kernel has CONFIG_ARCH_HAS_SYSCALL_WRAPPER, read pt_regs directly */ |
| | 854 | #define ___bpf_syscall_args0() ctx |
| | 855 | #define ___bpf_syscall_args1(x) ___bpf_syscall_args0(), (unsigned long long)PT_REGS_PARM1_SYSCALL(regs) |
| | 856 | #define ___bpf_syscall_args2(x, args...) ___bpf_syscall_args1(args), (unsigned long long)PT_REGS_PARM2_SYSCALL(regs) |
| | 857 | #define ___bpf_syscall_args3(x, args...) ___bpf_syscall_args2(args), (unsigned long long)PT_REGS_PARM3_SYSCALL(regs) |
| | 858 | #define ___bpf_syscall_args4(x, args...) ___bpf_syscall_args3(args), (unsigned long long)PT_REGS_PARM4_SYSCALL(regs) |
| | 859 | #define ___bpf_syscall_args5(x, args...) ___bpf_syscall_args4(args), (unsigned long long)PT_REGS_PARM5_SYSCALL(regs) |
| | 860 | #define ___bpf_syscall_args6(x, args...) ___bpf_syscall_args5(args), (unsigned long long)PT_REGS_PARM6_SYSCALL(regs) |
| | 861 | #define ___bpf_syscall_args7(x, args...) ___bpf_syscall_args6(args), (unsigned long long)PT_REGS_PARM7_SYSCALL(regs) |
| | 862 | #define ___bpf_syscall_args(args...) ___bpf_apply(___bpf_syscall_args, ___bpf_narg(args))(args) |
| | 863 | |
| | 864 | /* If kernel doesn't have CONFIG_ARCH_HAS_SYSCALL_WRAPPER, we have to BPF_CORE_READ from pt_regs */ |
| | 865 | #define ___bpf_syswrap_args0() ctx |
| | 866 | #define ___bpf_syswrap_args1(x) ___bpf_syswrap_args0(), (unsigned long long)PT_REGS_PARM1_CORE_SYSCALL(regs) |
| | 867 | #define ___bpf_syswrap_args2(x, args...) ___bpf_syswrap_args1(args), (unsigned long long)PT_REGS_PARM2_CORE_SYSCALL(regs) |
| | 868 | #define ___bpf_syswrap_args3(x, args...) ___bpf_syswrap_args2(args), (unsigned long long)PT_REGS_PARM3_CORE_SYSCALL(regs) |
| | 869 | #define ___bpf_syswrap_args4(x, args...) ___bpf_syswrap_args3(args), (unsigned long long)PT_REGS_PARM4_CORE_SYSCALL(regs) |
| | 870 | #define ___bpf_syswrap_args5(x, args...) ___bpf_syswrap_args4(args), (unsigned long long)PT_REGS_PARM5_CORE_SYSCALL(regs) |
| | 871 | #define ___bpf_syswrap_args6(x, args...) ___bpf_syswrap_args5(args), (unsigned long long)PT_REGS_PARM6_CORE_SYSCALL(regs) |
| | 872 | #define ___bpf_syswrap_args7(x, args...) ___bpf_syswrap_args6(args), (unsigned long long)PT_REGS_PARM7_CORE_SYSCALL(regs) |
| | 873 | #define ___bpf_syswrap_args(args...) ___bpf_apply(___bpf_syswrap_args, ___bpf_narg(args))(args) |
| | 874 | |
| | 875 | /* |
| | 876 | * BPF_KSYSCALL is a variant of BPF_KPROBE, which is intended for |
| | 877 | * tracing syscall functions, like __x64_sys_close. It hides the underlying |
| | 878 | * platform-specific low-level way of getting syscall input arguments from |
| | 879 | * struct pt_regs, and provides a familiar typed and named function arguments |
| | 880 | * syntax and semantics of accessing syscall input parameters. |
| | 881 | * |
| | 882 | * Original struct pt_regs * context is preserved as 'ctx' argument. This might |
| | 883 | * be necessary when using BPF helpers like bpf_perf_event_output(). |
| | 884 | * |
| | 885 | * At the moment BPF_KSYSCALL does not transparently handle all the calling |
| | 886 | * convention quirks for the following syscalls: |
| | 887 | * |
| | 888 | * - mmap(): __ARCH_WANT_SYS_OLD_MMAP. |
| | 889 | * - clone(): CONFIG_CLONE_BACKWARDS, CONFIG_CLONE_BACKWARDS2 and |
| | 890 | * CONFIG_CLONE_BACKWARDS3. |
| | 891 | * - socket-related syscalls: __ARCH_WANT_SYS_SOCKETCALL. |
| | 892 | * - compat syscalls. |
| | 893 | * |
| | 894 | * This may or may not change in the future. User needs to take extra measures |
| | 895 | * to handle such quirks explicitly, if necessary. |
| | 896 | * |
| | 897 | * This macro relies on BPF CO-RE support and virtual __kconfig externs. |
| | 898 | */ |
| | 899 | #define BPF_KSYSCALL(name, args...) \ |
| | 900 | name(struct pt_regs *ctx); \ |
| | 901 | extern _Bool LINUX_HAS_SYSCALL_WRAPPER __kconfig; \ |
| | 902 | static __always_inline typeof(name(0)) \ |
| | 903 | ____##name(struct pt_regs *ctx, ##args); \ |
| | 904 | typeof(name(0)) name(struct pt_regs *ctx) \ |
| | 905 | { \ |
| | 906 | struct pt_regs *regs = LINUX_HAS_SYSCALL_WRAPPER \ |
| | 907 | ? (struct pt_regs *)PT_REGS_PARM1(ctx) \ |
| | 908 | : ctx; \ |
| | 909 | _Pragma("GCC diagnostic push") \ |
| | 910 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| | 911 | if (LINUX_HAS_SYSCALL_WRAPPER) \ |
| | 912 | return ____##name(___bpf_syswrap_args(args)); \ |
| | 913 | else \ |
| | 914 | return ____##name(___bpf_syscall_args(args)); \ |
| | 915 | _Pragma("GCC diagnostic pop") \ |
| | 916 | } \ |
| | 917 | static __always_inline typeof(name(0)) \ |
| | 918 | ____##name(struct pt_regs *ctx, ##args) |
| | 919 | |
| | 920 | #define BPF_KPROBE_SYSCALL BPF_KSYSCALL |
| | 921 | |
| | 922 | /* BPF_UPROBE and BPF_URETPROBE are identical to BPF_KPROBE and BPF_KRETPROBE, |
| | 923 | * but are named way less confusingly for SEC("uprobe") and SEC("uretprobe") |
| | 924 | * use cases. |
| | 925 | */ |
| | 926 | #define BPF_UPROBE(name, args...) BPF_KPROBE(name, ##args) |
| | 927 | #define BPF_URETPROBE(name, args...) BPF_KRETPROBE(name, ##args) |
| | 928 | |
| | 929 | #endif |
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