1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/bpf.h> 4 #include <bpf/bpf_helpers.h> 5 #include <bpf/bpf_core_read.h> 6 #include "../../../include/linux/filter.h" 7 #include "bpf_misc.h" 8 #include <stdbool.h> 9 #include "bpf_kfuncs.h" 10 11 SEC("raw_tp") 12 __arch_x86_64 13 __log_level(4) __msg("stack depth 8") 14 __xlated("4: r5 = 5") 15 __xlated("5: w0 = ") 16 __xlated("6: r0 = &(void __percpu *)(r0)") 17 __xlated("7: r0 = *(u32 *)(r0 +0)") 18 __xlated("8: exit") 19 __success 20 __naked void simple(void) 21 { 22 asm volatile ( 23 "r1 = 1;" 24 "r2 = 2;" 25 "r3 = 3;" 26 "r4 = 4;" 27 "r5 = 5;" 28 "*(u64 *)(r10 - 16) = r1;" 29 "*(u64 *)(r10 - 24) = r2;" 30 "*(u64 *)(r10 - 32) = r3;" 31 "*(u64 *)(r10 - 40) = r4;" 32 "*(u64 *)(r10 - 48) = r5;" 33 "call %[bpf_get_smp_processor_id];" 34 "r5 = *(u64 *)(r10 - 48);" 35 "r4 = *(u64 *)(r10 - 40);" 36 "r3 = *(u64 *)(r10 - 32);" 37 "r2 = *(u64 *)(r10 - 24);" 38 "r1 = *(u64 *)(r10 - 16);" 39 "exit;" 40 : 41 : __imm(bpf_get_smp_processor_id) 42 : __clobber_all); 43 } 44 45 /* The logic for detecting and verifying bpf_fastcall pattern is the same for 46 * any arch, however x86 differs from arm64 or riscv64 in a way 47 * bpf_get_smp_processor_id is rewritten: 48 * - on x86 it is done by verifier 49 * - on arm64 and riscv64 it is done by jit 50 * 51 * Which leads to different xlated patterns for different archs: 52 * - on x86 the call is expanded as 3 instructions 53 * - on arm64 and riscv64 the call remains as is 54 * (but spills/fills are still removed) 55 * 56 * It is really desirable to check instruction indexes in the xlated 57 * patterns, so add this canary test to check that function rewrite by 58 * jit is correctly processed by bpf_fastcall logic, keep the rest of the 59 * tests as x86. 60 */ 61 SEC("raw_tp") 62 __arch_arm64 63 __arch_riscv64 64 __xlated("0: r1 = 1") 65 __xlated("1: call bpf_get_smp_processor_id") 66 __xlated("2: exit") 67 __success 68 __naked void canary_arm64_riscv64(void) 69 { 70 asm volatile ( 71 "r1 = 1;" 72 "*(u64 *)(r10 - 16) = r1;" 73 "call %[bpf_get_smp_processor_id];" 74 "r1 = *(u64 *)(r10 - 16);" 75 "exit;" 76 : 77 : __imm(bpf_get_smp_processor_id) 78 : __clobber_all); 79 } 80 81 SEC("raw_tp") 82 __arch_x86_64 83 __xlated("1: r0 = &(void __percpu *)(r0)") 84 __xlated("...") 85 __xlated("3: exit") 86 __success 87 __naked void canary_zero_spills(void) 88 { 89 asm volatile ( 90 "call %[bpf_get_smp_processor_id];" 91 "exit;" 92 : 93 : __imm(bpf_get_smp_processor_id) 94 : __clobber_all); 95 } 96 97 SEC("raw_tp") 98 __arch_x86_64 99 __log_level(4) __msg("stack depth 16") 100 __xlated("1: *(u64 *)(r10 -16) = r1") 101 __xlated("...") 102 __xlated("3: r0 = &(void __percpu *)(r0)") 103 __xlated("...") 104 __xlated("5: r2 = *(u64 *)(r10 -16)") 105 __success 106 __naked void wrong_reg_in_pattern1(void) 107 { 108 asm volatile ( 109 "r1 = 1;" 110 "*(u64 *)(r10 - 16) = r1;" 111 "call %[bpf_get_smp_processor_id];" 112 "r2 = *(u64 *)(r10 - 16);" 113 "exit;" 114 : 115 : __imm(bpf_get_smp_processor_id) 116 : __clobber_all); 117 } 118 119 SEC("raw_tp") 120 __arch_x86_64 121 __xlated("1: *(u64 *)(r10 -16) = r6") 122 __xlated("...") 123 __xlated("3: r0 = &(void __percpu *)(r0)") 124 __xlated("...") 125 __xlated("5: r6 = *(u64 *)(r10 -16)") 126 __success 127 __naked void wrong_reg_in_pattern2(void) 128 { 129 asm volatile ( 130 "r6 = 1;" 131 "*(u64 *)(r10 - 16) = r6;" 132 "call %[bpf_get_smp_processor_id];" 133 "r6 = *(u64 *)(r10 - 16);" 134 "exit;" 135 : 136 : __imm(bpf_get_smp_processor_id) 137 : __clobber_all); 138 } 139 140 SEC("raw_tp") 141 __arch_x86_64 142 __xlated("1: *(u64 *)(r10 -16) = r0") 143 __xlated("...") 144 __xlated("3: r0 = &(void __percpu *)(r0)") 145 __xlated("...") 146 __xlated("5: r0 = *(u64 *)(r10 -16)") 147 __success 148 __naked void wrong_reg_in_pattern3(void) 149 { 150 asm volatile ( 151 "r0 = 1;" 152 "*(u64 *)(r10 - 16) = r0;" 153 "call %[bpf_get_smp_processor_id];" 154 "r0 = *(u64 *)(r10 - 16);" 155 "exit;" 156 : 157 : __imm(bpf_get_smp_processor_id) 158 : __clobber_all); 159 } 160 161 SEC("raw_tp") 162 __arch_x86_64 163 __xlated("2: *(u64 *)(r2 -16) = r1") 164 __xlated("...") 165 __xlated("4: r0 = &(void __percpu *)(r0)") 166 __xlated("...") 167 __xlated("6: r1 = *(u64 *)(r10 -16)") 168 __success 169 __naked void wrong_base_in_pattern(void) 170 { 171 asm volatile ( 172 "r1 = 1;" 173 "r2 = r10;" 174 "*(u64 *)(r2 - 16) = r1;" 175 "call %[bpf_get_smp_processor_id];" 176 "r1 = *(u64 *)(r10 - 16);" 177 "exit;" 178 : 179 : __imm(bpf_get_smp_processor_id) 180 : __clobber_all); 181 } 182 183 SEC("raw_tp") 184 __arch_x86_64 185 __xlated("1: *(u64 *)(r10 -16) = r1") 186 __xlated("...") 187 __xlated("3: r0 = &(void __percpu *)(r0)") 188 __xlated("...") 189 __xlated("5: r2 = 1") 190 __success 191 __naked void wrong_insn_in_pattern(void) 192 { 193 asm volatile ( 194 "r1 = 1;" 195 "*(u64 *)(r10 - 16) = r1;" 196 "call %[bpf_get_smp_processor_id];" 197 "r2 = 1;" 198 "r1 = *(u64 *)(r10 - 16);" 199 "exit;" 200 : 201 : __imm(bpf_get_smp_processor_id) 202 : __clobber_all); 203 } 204 205 SEC("raw_tp") 206 __arch_x86_64 207 __xlated("2: *(u64 *)(r10 -16) = r1") 208 __xlated("...") 209 __xlated("4: r0 = &(void __percpu *)(r0)") 210 __xlated("...") 211 __xlated("6: r1 = *(u64 *)(r10 -8)") 212 __success 213 __naked void wrong_off_in_pattern1(void) 214 { 215 asm volatile ( 216 "r1 = 1;" 217 "*(u64 *)(r10 - 8) = r1;" 218 "*(u64 *)(r10 - 16) = r1;" 219 "call %[bpf_get_smp_processor_id];" 220 "r1 = *(u64 *)(r10 - 8);" 221 "exit;" 222 : 223 : __imm(bpf_get_smp_processor_id) 224 : __clobber_all); 225 } 226 227 SEC("raw_tp") 228 __arch_x86_64 229 __xlated("1: *(u32 *)(r10 -4) = r1") 230 __xlated("...") 231 __xlated("3: r0 = &(void __percpu *)(r0)") 232 __xlated("...") 233 __xlated("5: r1 = *(u32 *)(r10 -4)") 234 __success 235 __naked void wrong_off_in_pattern2(void) 236 { 237 asm volatile ( 238 "r1 = 1;" 239 "*(u32 *)(r10 - 4) = r1;" 240 "call %[bpf_get_smp_processor_id];" 241 "r1 = *(u32 *)(r10 - 4);" 242 "exit;" 243 : 244 : __imm(bpf_get_smp_processor_id) 245 : __clobber_all); 246 } 247 248 SEC("raw_tp") 249 __arch_x86_64 250 __xlated("1: *(u32 *)(r10 -16) = r1") 251 __xlated("...") 252 __xlated("3: r0 = &(void __percpu *)(r0)") 253 __xlated("...") 254 __xlated("5: r1 = *(u32 *)(r10 -16)") 255 __success 256 __naked void wrong_size_in_pattern(void) 257 { 258 asm volatile ( 259 "r1 = 1;" 260 "*(u32 *)(r10 - 16) = r1;" 261 "call %[bpf_get_smp_processor_id];" 262 "r1 = *(u32 *)(r10 - 16);" 263 "exit;" 264 : 265 : __imm(bpf_get_smp_processor_id) 266 : __clobber_all); 267 } 268 269 SEC("raw_tp") 270 __arch_x86_64 271 __xlated("2: *(u32 *)(r10 -8) = r1") 272 __xlated("...") 273 __xlated("4: r0 = &(void __percpu *)(r0)") 274 __xlated("...") 275 __xlated("6: r1 = *(u32 *)(r10 -8)") 276 __success 277 __naked void partial_pattern(void) 278 { 279 asm volatile ( 280 "r1 = 1;" 281 "r2 = 2;" 282 "*(u32 *)(r10 - 8) = r1;" 283 "*(u64 *)(r10 - 16) = r2;" 284 "call %[bpf_get_smp_processor_id];" 285 "r2 = *(u64 *)(r10 - 16);" 286 "r1 = *(u32 *)(r10 - 8);" 287 "exit;" 288 : 289 : __imm(bpf_get_smp_processor_id) 290 : __clobber_all); 291 } 292 293 SEC("raw_tp") 294 __arch_x86_64 295 __xlated("0: r1 = 1") 296 __xlated("1: r2 = 2") 297 /* not patched, spills for -8, -16 not removed */ 298 __xlated("2: *(u64 *)(r10 -8) = r1") 299 __xlated("3: *(u64 *)(r10 -16) = r2") 300 __xlated("...") 301 __xlated("5: r0 = &(void __percpu *)(r0)") 302 __xlated("...") 303 __xlated("7: r2 = *(u64 *)(r10 -16)") 304 __xlated("8: r1 = *(u64 *)(r10 -8)") 305 /* patched, spills for -24, -32 removed */ 306 __xlated("...") 307 __xlated("10: r0 = &(void __percpu *)(r0)") 308 __xlated("...") 309 __xlated("12: exit") 310 __success 311 __naked void min_stack_offset(void) 312 { 313 asm volatile ( 314 "r1 = 1;" 315 "r2 = 2;" 316 /* this call won't be patched */ 317 "*(u64 *)(r10 - 8) = r1;" 318 "*(u64 *)(r10 - 16) = r2;" 319 "call %[bpf_get_smp_processor_id];" 320 "r2 = *(u64 *)(r10 - 16);" 321 "r1 = *(u64 *)(r10 - 8);" 322 /* this call would be patched */ 323 "*(u64 *)(r10 - 24) = r1;" 324 "*(u64 *)(r10 - 32) = r2;" 325 "call %[bpf_get_smp_processor_id];" 326 "r2 = *(u64 *)(r10 - 32);" 327 "r1 = *(u64 *)(r10 - 24);" 328 "exit;" 329 : 330 : __imm(bpf_get_smp_processor_id) 331 : __clobber_all); 332 } 333 334 SEC("raw_tp") 335 __arch_x86_64 336 __xlated("1: *(u64 *)(r10 -8) = r1") 337 __xlated("...") 338 __xlated("3: r0 = &(void __percpu *)(r0)") 339 __xlated("...") 340 __xlated("5: r1 = *(u64 *)(r10 -8)") 341 __success 342 __naked void bad_fixed_read(void) 343 { 344 asm volatile ( 345 "r1 = 1;" 346 "*(u64 *)(r10 - 8) = r1;" 347 "call %[bpf_get_smp_processor_id];" 348 "r1 = *(u64 *)(r10 - 8);" 349 "r1 = r10;" 350 "r1 += -8;" 351 "r1 = *(u64 *)(r1 - 0);" 352 "exit;" 353 : 354 : __imm(bpf_get_smp_processor_id) 355 : __clobber_all); 356 } 357 358 SEC("raw_tp") 359 __arch_x86_64 360 __xlated("1: *(u64 *)(r10 -8) = r1") 361 __xlated("...") 362 __xlated("3: r0 = &(void __percpu *)(r0)") 363 __xlated("...") 364 __xlated("5: r1 = *(u64 *)(r10 -8)") 365 __success 366 __naked void bad_fixed_write(void) 367 { 368 asm volatile ( 369 "r1 = 1;" 370 "*(u64 *)(r10 - 8) = r1;" 371 "call %[bpf_get_smp_processor_id];" 372 "r1 = *(u64 *)(r10 - 8);" 373 "r1 = r10;" 374 "r1 += -8;" 375 "*(u64 *)(r1 - 0) = r1;" 376 "exit;" 377 : 378 : __imm(bpf_get_smp_processor_id) 379 : __clobber_all); 380 } 381 382 SEC("raw_tp") 383 __arch_x86_64 384 __xlated("6: *(u64 *)(r10 -16) = r1") 385 __xlated("...") 386 __xlated("8: r0 = &(void __percpu *)(r0)") 387 __xlated("...") 388 __xlated("10: r1 = *(u64 *)(r10 -16)") 389 __success 390 __naked void bad_varying_read(void) 391 { 392 asm volatile ( 393 "r6 = *(u64 *)(r1 + 0);" /* random scalar value */ 394 "r6 &= 0x7;" /* r6 range [0..7] */ 395 "r6 += 0x2;" /* r6 range [2..9] */ 396 "r7 = 0;" 397 "r7 -= r6;" /* r7 range [-9..-2] */ 398 "r1 = 1;" 399 "*(u64 *)(r10 - 16) = r1;" 400 "call %[bpf_get_smp_processor_id];" 401 "r1 = *(u64 *)(r10 - 16);" 402 "r1 = r10;" 403 "r1 += r7;" 404 "r1 = *(u8 *)(r1 - 0);" /* touches slot [-16..-9] where spills are stored */ 405 "exit;" 406 : 407 : __imm(bpf_get_smp_processor_id) 408 : __clobber_all); 409 } 410 411 SEC("raw_tp") 412 __arch_x86_64 413 __xlated("6: *(u64 *)(r10 -16) = r1") 414 __xlated("...") 415 __xlated("8: r0 = &(void __percpu *)(r0)") 416 __xlated("...") 417 __xlated("10: r1 = *(u64 *)(r10 -16)") 418 __success 419 __naked void bad_varying_write(void) 420 { 421 asm volatile ( 422 "r6 = *(u64 *)(r1 + 0);" /* random scalar value */ 423 "r6 &= 0x7;" /* r6 range [0..7] */ 424 "r6 += 0x2;" /* r6 range [2..9] */ 425 "r7 = 0;" 426 "r7 -= r6;" /* r7 range [-9..-2] */ 427 "r1 = 1;" 428 "*(u64 *)(r10 - 16) = r1;" 429 "call %[bpf_get_smp_processor_id];" 430 "r1 = *(u64 *)(r10 - 16);" 431 "r1 = r10;" 432 "r1 += r7;" 433 "*(u8 *)(r1 - 0) = r7;" /* touches slot [-16..-9] where spills are stored */ 434 "exit;" 435 : 436 : __imm(bpf_get_smp_processor_id) 437 : __clobber_all); 438 } 439 440 SEC("raw_tp") 441 __arch_x86_64 442 __xlated("1: *(u64 *)(r10 -8) = r1") 443 __xlated("...") 444 __xlated("3: r0 = &(void __percpu *)(r0)") 445 __xlated("...") 446 __xlated("5: r1 = *(u64 *)(r10 -8)") 447 __success 448 __naked void bad_write_in_subprog(void) 449 { 450 asm volatile ( 451 "r1 = 1;" 452 "*(u64 *)(r10 - 8) = r1;" 453 "call %[bpf_get_smp_processor_id];" 454 "r1 = *(u64 *)(r10 - 8);" 455 "r1 = r10;" 456 "r1 += -8;" 457 "call bad_write_in_subprog_aux;" 458 "exit;" 459 : 460 : __imm(bpf_get_smp_processor_id) 461 : __clobber_all); 462 } 463 464 __used 465 __naked static void bad_write_in_subprog_aux(void) 466 { 467 asm volatile ( 468 "r0 = 1;" 469 "*(u64 *)(r1 - 0) = r0;" /* invalidates bpf_fastcall contract for caller: */ 470 "exit;" /* caller stack at -8 used outside of the pattern */ 471 ::: __clobber_all); 472 } 473 474 SEC("raw_tp") 475 __arch_x86_64 476 __xlated("1: *(u64 *)(r10 -8) = r1") 477 __xlated("...") 478 __xlated("3: r0 = &(void __percpu *)(r0)") 479 __xlated("...") 480 __xlated("5: r1 = *(u64 *)(r10 -8)") 481 __success 482 __naked void bad_helper_write(void) 483 { 484 asm volatile ( 485 "r1 = 1;" 486 /* bpf_fastcall pattern with stack offset -8 */ 487 "*(u64 *)(r10 - 8) = r1;" 488 "call %[bpf_get_smp_processor_id];" 489 "r1 = *(u64 *)(r10 - 8);" 490 "r1 = r10;" 491 "r1 += -8;" 492 "r2 = 1;" 493 "r3 = 42;" 494 /* read dst is fp[-8], thus bpf_fastcall rewrite not applied */ 495 "call %[bpf_probe_read_kernel];" 496 "exit;" 497 : 498 : __imm(bpf_get_smp_processor_id), 499 __imm(bpf_probe_read_kernel) 500 : __clobber_all); 501 } 502 503 SEC("raw_tp") 504 __arch_x86_64 505 /* main, not patched */ 506 __xlated("1: *(u64 *)(r10 -8) = r1") 507 __xlated("...") 508 __xlated("3: r0 = &(void __percpu *)(r0)") 509 __xlated("...") 510 __xlated("5: r1 = *(u64 *)(r10 -8)") 511 __xlated("...") 512 __xlated("9: call pc+1") 513 __xlated("...") 514 __xlated("10: exit") 515 /* subprogram, patched */ 516 __xlated("11: r1 = 1") 517 __xlated("...") 518 __xlated("13: r0 = &(void __percpu *)(r0)") 519 __xlated("...") 520 __xlated("15: exit") 521 __success 522 __naked void invalidate_one_subprog(void) 523 { 524 asm volatile ( 525 "r1 = 1;" 526 "*(u64 *)(r10 - 8) = r1;" 527 "call %[bpf_get_smp_processor_id];" 528 "r1 = *(u64 *)(r10 - 8);" 529 "r1 = r10;" 530 "r1 += -8;" 531 "r1 = *(u64 *)(r1 - 0);" 532 "call invalidate_one_subprog_aux;" 533 "exit;" 534 : 535 : __imm(bpf_get_smp_processor_id) 536 : __clobber_all); 537 } 538 539 __used 540 __naked static void invalidate_one_subprog_aux(void) 541 { 542 asm volatile ( 543 "r1 = 1;" 544 "*(u64 *)(r10 - 8) = r1;" 545 "call %[bpf_get_smp_processor_id];" 546 "r1 = *(u64 *)(r10 - 8);" 547 "exit;" 548 : 549 : __imm(bpf_get_smp_processor_id) 550 : __clobber_all); 551 } 552 553 SEC("raw_tp") 554 __arch_x86_64 555 /* main */ 556 __xlated("0: r1 = 1") 557 __xlated("...") 558 __xlated("2: r0 = &(void __percpu *)(r0)") 559 __xlated("...") 560 __xlated("4: call pc+1") 561 __xlated("5: exit") 562 /* subprogram */ 563 __xlated("6: r1 = 1") 564 __xlated("...") 565 __xlated("8: r0 = &(void __percpu *)(r0)") 566 __xlated("...") 567 __xlated("10: *(u64 *)(r10 -16) = r1") 568 __xlated("11: exit") 569 __success 570 __naked void subprogs_use_independent_offsets(void) 571 { 572 asm volatile ( 573 "r1 = 1;" 574 "*(u64 *)(r10 - 16) = r1;" 575 "call %[bpf_get_smp_processor_id];" 576 "r1 = *(u64 *)(r10 - 16);" 577 "call subprogs_use_independent_offsets_aux;" 578 "exit;" 579 : 580 : __imm(bpf_get_smp_processor_id) 581 : __clobber_all); 582 } 583 584 __used 585 __naked static void subprogs_use_independent_offsets_aux(void) 586 { 587 asm volatile ( 588 "r1 = 1;" 589 "*(u64 *)(r10 - 24) = r1;" 590 "call %[bpf_get_smp_processor_id];" 591 "r1 = *(u64 *)(r10 - 24);" 592 "*(u64 *)(r10 - 16) = r1;" 593 "exit;" 594 : 595 : __imm(bpf_get_smp_processor_id) 596 : __clobber_all); 597 } 598 599 SEC("raw_tp") 600 __arch_x86_64 601 __log_level(4) __msg("stack depth 8") 602 __xlated("2: r0 = &(void __percpu *)(r0)") 603 __success 604 __naked void helper_call_does_not_prevent_bpf_fastcall(void) 605 { 606 asm volatile ( 607 "r1 = 1;" 608 "*(u64 *)(r10 - 8) = r1;" 609 "call %[bpf_get_smp_processor_id];" 610 "r1 = *(u64 *)(r10 - 8);" 611 "*(u64 *)(r10 - 8) = r1;" 612 "call %[bpf_get_prandom_u32];" 613 "r1 = *(u64 *)(r10 - 8);" 614 "exit;" 615 : 616 : __imm(bpf_get_smp_processor_id), 617 __imm(bpf_get_prandom_u32) 618 : __clobber_all); 619 } 620 621 SEC("raw_tp") 622 __arch_x86_64 623 __log_level(4) __msg("stack depth 16") 624 /* may_goto counter at -16 */ 625 __xlated("0: *(u64 *)(r10 -16) =") 626 __xlated("1: r1 = 1") 627 __xlated("...") 628 __xlated("3: r0 = &(void __percpu *)(r0)") 629 __xlated("...") 630 /* may_goto expansion starts */ 631 __xlated("5: r11 = *(u64 *)(r10 -16)") 632 __xlated("6: if r11 == 0x0 goto pc+3") 633 __xlated("7: r11 -= 1") 634 __xlated("8: *(u64 *)(r10 -16) = r11") 635 /* may_goto expansion ends */ 636 __xlated("9: *(u64 *)(r10 -8) = r1") 637 __xlated("10: exit") 638 __success 639 __naked void may_goto_interaction(void) 640 { 641 asm volatile ( 642 "r1 = 1;" 643 "*(u64 *)(r10 - 16) = r1;" 644 "call %[bpf_get_smp_processor_id];" 645 "r1 = *(u64 *)(r10 - 16);" 646 ".8byte %[may_goto];" 647 /* just touch some stack at -8 */ 648 "*(u64 *)(r10 - 8) = r1;" 649 "exit;" 650 : 651 : __imm(bpf_get_smp_processor_id), 652 __imm_insn(may_goto, BPF_RAW_INSN(BPF_JMP | BPF_JCOND, 0, 0, +1 /* offset */, 0)) 653 : __clobber_all); 654 } 655 656 __used 657 __naked static void dummy_loop_callback(void) 658 { 659 asm volatile ( 660 "r0 = 0;" 661 "exit;" 662 ::: __clobber_all); 663 } 664 665 SEC("raw_tp") 666 __arch_x86_64 667 __log_level(4) __msg("stack depth 32+0") 668 __xlated("2: r1 = 1") 669 __xlated("3: w0 =") 670 __xlated("4: r0 = &(void __percpu *)(r0)") 671 __xlated("5: r0 = *(u32 *)(r0 +0)") 672 /* bpf_loop params setup */ 673 __xlated("6: r2 =") 674 __xlated("7: r3 = 0") 675 __xlated("8: r4 = 0") 676 __xlated("...") 677 /* ... part of the inlined bpf_loop */ 678 __xlated("12: *(u64 *)(r10 -32) = r6") 679 __xlated("13: *(u64 *)(r10 -24) = r7") 680 __xlated("14: *(u64 *)(r10 -16) = r8") 681 __xlated("...") 682 __xlated("21: call pc+8") /* dummy_loop_callback */ 683 /* ... last insns of the bpf_loop_interaction1 */ 684 __xlated("...") 685 __xlated("28: r0 = 0") 686 __xlated("29: exit") 687 /* dummy_loop_callback */ 688 __xlated("30: r0 = 0") 689 __xlated("31: exit") 690 __success 691 __naked int bpf_loop_interaction1(void) 692 { 693 asm volatile ( 694 "r1 = 1;" 695 /* bpf_fastcall stack region at -16, but could be removed */ 696 "*(u64 *)(r10 - 16) = r1;" 697 "call %[bpf_get_smp_processor_id];" 698 "r1 = *(u64 *)(r10 - 16);" 699 "r2 = %[dummy_loop_callback];" 700 "r3 = 0;" 701 "r4 = 0;" 702 "call %[bpf_loop];" 703 "r0 = 0;" 704 "exit;" 705 : 706 : __imm_ptr(dummy_loop_callback), 707 __imm(bpf_get_smp_processor_id), 708 __imm(bpf_loop) 709 : __clobber_common 710 ); 711 } 712 713 SEC("raw_tp") 714 __arch_x86_64 715 __log_level(4) __msg("stack depth 40+0") 716 /* call bpf_get_smp_processor_id */ 717 __xlated("2: r1 = 42") 718 __xlated("3: w0 =") 719 __xlated("4: r0 = &(void __percpu *)(r0)") 720 __xlated("5: r0 = *(u32 *)(r0 +0)") 721 /* call bpf_get_prandom_u32 */ 722 __xlated("6: *(u64 *)(r10 -16) = r1") 723 __xlated("7: call") 724 __xlated("8: r1 = *(u64 *)(r10 -16)") 725 __xlated("...") 726 /* ... part of the inlined bpf_loop */ 727 __xlated("15: *(u64 *)(r10 -40) = r6") 728 __xlated("16: *(u64 *)(r10 -32) = r7") 729 __xlated("17: *(u64 *)(r10 -24) = r8") 730 __success 731 __naked int bpf_loop_interaction2(void) 732 { 733 asm volatile ( 734 "r1 = 42;" 735 /* bpf_fastcall stack region at -16, cannot be removed */ 736 "*(u64 *)(r10 - 16) = r1;" 737 "call %[bpf_get_smp_processor_id];" 738 "r1 = *(u64 *)(r10 - 16);" 739 "*(u64 *)(r10 - 16) = r1;" 740 "call %[bpf_get_prandom_u32];" 741 "r1 = *(u64 *)(r10 - 16);" 742 "r2 = %[dummy_loop_callback];" 743 "r3 = 0;" 744 "r4 = 0;" 745 "call %[bpf_loop];" 746 "r0 = 0;" 747 "exit;" 748 : 749 : __imm_ptr(dummy_loop_callback), 750 __imm(bpf_get_smp_processor_id), 751 __imm(bpf_get_prandom_u32), 752 __imm(bpf_loop) 753 : __clobber_common 754 ); 755 } 756 757 SEC("raw_tp") 758 __arch_x86_64 759 __log_level(4) 760 __msg("stack depth 512+0") 761 /* just to print xlated version when debugging */ 762 __xlated("r0 = &(void __percpu *)(r0)") 763 __success 764 /* cumulative_stack_depth() stack usage is MAX_BPF_STACK, 765 * called subprogram uses an additional slot for bpf_fastcall spill/fill, 766 * since bpf_fastcall spill/fill could be removed the program still fits 767 * in MAX_BPF_STACK and should be accepted. 768 */ 769 __naked int cumulative_stack_depth(void) 770 { 771 asm volatile( 772 "r1 = 42;" 773 "*(u64 *)(r10 - %[max_bpf_stack]) = r1;" 774 "call cumulative_stack_depth_subprog;" 775 "exit;" 776 : 777 : __imm_const(max_bpf_stack, MAX_BPF_STACK) 778 : __clobber_all 779 ); 780 } 781 782 __used 783 __naked static void cumulative_stack_depth_subprog(void) 784 { 785 asm volatile ( 786 "*(u64 *)(r10 - 8) = r1;" 787 "call %[bpf_get_smp_processor_id];" 788 "r1 = *(u64 *)(r10 - 8);" 789 "exit;" 790 :: __imm(bpf_get_smp_processor_id) : __clobber_all); 791 } 792 793 SEC("cgroup/getsockname_unix") 794 __xlated("0: r2 = 1") 795 /* bpf_cast_to_kern_ctx is replaced by a single assignment */ 796 __xlated("1: r0 = r1") 797 __xlated("2: r0 = r2") 798 __xlated("3: exit") 799 __success 800 __naked void kfunc_bpf_cast_to_kern_ctx(void) 801 { 802 asm volatile ( 803 "r2 = 1;" 804 "*(u64 *)(r10 - 32) = r2;" 805 "call %[bpf_cast_to_kern_ctx];" 806 "r2 = *(u64 *)(r10 - 32);" 807 "r0 = r2;" 808 "exit;" 809 : 810 : __imm(bpf_cast_to_kern_ctx) 811 : __clobber_all); 812 } 813 814 SEC("raw_tp") 815 __xlated("3: r3 = 1") 816 /* bpf_rdonly_cast is replaced by a single assignment */ 817 __xlated("4: r0 = r1") 818 __xlated("5: r0 = r3") 819 void kfunc_bpf_rdonly_cast(void) 820 { 821 asm volatile ( 822 "r2 = %[btf_id];" 823 "r3 = 1;" 824 "*(u64 *)(r10 - 32) = r3;" 825 "call %[bpf_rdonly_cast];" 826 "r3 = *(u64 *)(r10 - 32);" 827 "r0 = r3;" 828 : 829 : __imm(bpf_rdonly_cast), 830 [btf_id]"r"(bpf_core_type_id_kernel(union bpf_attr)) 831 : __clobber_common); 832 } 833 834 /* BTF FUNC records are not generated for kfuncs referenced 835 * from inline assembly. These records are necessary for 836 * libbpf to link the program. The function below is a hack 837 * to ensure that BTF FUNC records are generated. 838 */ 839 void kfunc_root(void) 840 { 841 bpf_cast_to_kern_ctx(0); 842 bpf_rdonly_cast(0, 0); 843 } 844 845 char _license[] SEC("license") = "GPL"; 846