1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ 3 #include <test_progs.h> 4 5 #define _SDT_HAS_SEMAPHORES 1 6 #include "../sdt.h" 7 8 #include "test_usdt.skel.h" 9 #include "test_urandom_usdt.skel.h" 10 11 int lets_test_this(int); 12 13 static volatile int idx = 2; 14 static volatile __u64 bla = 0xFEDCBA9876543210ULL; 15 static volatile short nums[] = {-1, -2, -3, -4}; 16 17 static volatile struct { 18 int x; 19 signed char y; 20 } t1 = { 1, -127 }; 21 22 #define SEC(name) __attribute__((section(name), used)) 23 24 unsigned short test_usdt0_semaphore SEC(".probes"); 25 unsigned short test_usdt3_semaphore SEC(".probes"); 26 unsigned short test_usdt12_semaphore SEC(".probes"); 27 28 static void __always_inline trigger_func(int x) { 29 long y = 42; 30 31 if (test_usdt0_semaphore) 32 STAP_PROBE(test, usdt0); 33 if (test_usdt3_semaphore) 34 STAP_PROBE3(test, usdt3, x, y, &bla); 35 if (test_usdt12_semaphore) { 36 STAP_PROBE12(test, usdt12, 37 x, x + 1, y, x + y, 5, 38 y / 7, bla, &bla, -9, nums[x], 39 nums[idx], t1.y); 40 } 41 } 42 43 #if defined(__x86_64__) || defined(__i386__) 44 /* 45 * SIB (Scale-Index-Base) addressing format: "size@(base_reg, index_reg, scale)" 46 * - 'size' is the size in bytes of the array element, and its sign indicates 47 * whether the type is signed (negative) or unsigned (positive). 48 * - 'base_reg' is the register holding the base address, normally rdx or edx 49 * - 'index_reg' is the register holding the index, normally rax or eax 50 * - 'scale' is the scaling factor (typically 1, 2, 4, or 8), which matches the 51 * size of the element type. 52 * 53 * For example, for an array of 'short' (signed 2-byte elements), the SIB spec would be: 54 * - size: -2 (negative because 'short' is signed) 55 * - scale: 2 (since sizeof(short) == 2) 56 * 57 * The resulting SIB format: "-2@(%%rdx,%%rax,2)" for x86_64, "-2@(%%edx,%%eax,2)" for i386 58 */ 59 static volatile short array[] = {-1, -2, -3, -4}; 60 61 #if defined(__x86_64__) 62 #define USDT_SIB_ARG_SPEC -2@(%%rdx,%%rax,2) 63 #else 64 #define USDT_SIB_ARG_SPEC -2@(%%edx,%%eax,2) 65 #endif 66 67 unsigned short test_usdt_sib_semaphore SEC(".probes"); 68 69 static void trigger_sib_spec(void) 70 { 71 /* 72 * Force SIB addressing with inline assembly. 73 * 74 * You must compile with -std=gnu99 or -std=c99 to use the 75 * STAP_PROBE_ASM macro. 76 * 77 * The STAP_PROBE_ASM macro generates a quoted string that gets 78 * inserted between the surrounding assembly instructions. In this 79 * case, USDT_SIB_ARG_SPEC is embedded directly into the instruction 80 * stream, creating a probe point between the asm statement boundaries. 81 * It works fine with gcc/clang. 82 * 83 * Register constraints: 84 * - "d"(array): Binds the 'array' variable to %rdx or %edx register 85 * - "a"(0): Binds the constant 0 to %rax or %eax register 86 * These ensure that when USDT_SIB_ARG_SPEC references %%rdx(%edx) and 87 * %%rax(%eax), they contain the expected values for SIB addressing. 88 * 89 * The "memory" clobber prevents the compiler from reordering memory 90 * accesses around the probe point, ensuring that the probe behavior 91 * is predictable and consistent. 92 */ 93 asm volatile( 94 STAP_PROBE_ASM(test, usdt_sib, USDT_SIB_ARG_SPEC) 95 : 96 : "d"(array), "a"(0) 97 : "memory" 98 ); 99 } 100 #endif 101 102 static void subtest_basic_usdt(bool optimized) 103 { 104 LIBBPF_OPTS(bpf_usdt_opts, opts); 105 struct test_usdt *skel; 106 struct test_usdt__bss *bss; 107 int err, i, called; 108 const __u64 expected_cookie = 0xcafedeadbeeffeed; 109 110 #define TRIGGER(x) ({ \ 111 trigger_func(x); \ 112 if (optimized) \ 113 trigger_func(x); \ 114 optimized ? 2 : 1; \ 115 }) 116 117 skel = test_usdt__open_and_load(); 118 if (!ASSERT_OK_PTR(skel, "skel_open")) 119 return; 120 121 bss = skel->bss; 122 bss->my_pid = getpid(); 123 124 err = test_usdt__attach(skel); 125 if (!ASSERT_OK(err, "skel_attach")) 126 goto cleanup; 127 128 /* usdt0 won't be auto-attached */ 129 opts.usdt_cookie = expected_cookie; 130 skel->links.usdt0 = bpf_program__attach_usdt(skel->progs.usdt0, 131 0 /*self*/, "/proc/self/exe", 132 "test", "usdt0", &opts); 133 if (!ASSERT_OK_PTR(skel->links.usdt0, "usdt0_link")) 134 goto cleanup; 135 136 #if defined(__x86_64__) || defined(__i386__) 137 opts.usdt_cookie = expected_cookie; 138 skel->links.usdt_sib = bpf_program__attach_usdt(skel->progs.usdt_sib, 139 0 /*self*/, "/proc/self/exe", 140 "test", "usdt_sib", &opts); 141 if (!ASSERT_OK_PTR(skel->links.usdt_sib, "usdt_sib_link")) 142 goto cleanup; 143 #endif 144 145 called = TRIGGER(1); 146 147 ASSERT_EQ(bss->usdt0_called, called, "usdt0_called"); 148 ASSERT_EQ(bss->usdt3_called, called, "usdt3_called"); 149 ASSERT_EQ(bss->usdt12_called, called, "usdt12_called"); 150 151 ASSERT_EQ(bss->usdt0_cookie, expected_cookie, "usdt0_cookie"); 152 ASSERT_EQ(bss->usdt0_arg_cnt, 0, "usdt0_arg_cnt"); 153 ASSERT_EQ(bss->usdt0_arg_ret, -ENOENT, "usdt0_arg_ret"); 154 ASSERT_EQ(bss->usdt0_arg_size, -ENOENT, "usdt0_arg_size"); 155 156 /* auto-attached usdt3 gets default zero cookie value */ 157 ASSERT_EQ(bss->usdt3_cookie, 0, "usdt3_cookie"); 158 ASSERT_EQ(bss->usdt3_arg_cnt, 3, "usdt3_arg_cnt"); 159 160 ASSERT_EQ(bss->usdt3_arg_rets[0], 0, "usdt3_arg1_ret"); 161 ASSERT_EQ(bss->usdt3_arg_rets[1], 0, "usdt3_arg2_ret"); 162 ASSERT_EQ(bss->usdt3_arg_rets[2], 0, "usdt3_arg3_ret"); 163 ASSERT_EQ(bss->usdt3_args[0], 1, "usdt3_arg1"); 164 ASSERT_EQ(bss->usdt3_args[1], 42, "usdt3_arg2"); 165 ASSERT_EQ(bss->usdt3_args[2], (uintptr_t)&bla, "usdt3_arg3"); 166 ASSERT_EQ(bss->usdt3_arg_sizes[0], 4, "usdt3_arg1_size"); 167 ASSERT_EQ(bss->usdt3_arg_sizes[1], 8, "usdt3_arg2_size"); 168 ASSERT_EQ(bss->usdt3_arg_sizes[2], 8, "usdt3_arg3_size"); 169 170 /* auto-attached usdt12 gets default zero cookie value */ 171 ASSERT_EQ(bss->usdt12_cookie, 0, "usdt12_cookie"); 172 ASSERT_EQ(bss->usdt12_arg_cnt, 12, "usdt12_arg_cnt"); 173 174 ASSERT_EQ(bss->usdt12_args[0], 1, "usdt12_arg1"); 175 ASSERT_EQ(bss->usdt12_args[1], 1 + 1, "usdt12_arg2"); 176 ASSERT_EQ(bss->usdt12_args[2], 42, "usdt12_arg3"); 177 ASSERT_EQ(bss->usdt12_args[3], 42 + 1, "usdt12_arg4"); 178 ASSERT_EQ(bss->usdt12_args[4], 5, "usdt12_arg5"); 179 ASSERT_EQ(bss->usdt12_args[5], 42 / 7, "usdt12_arg6"); 180 ASSERT_EQ(bss->usdt12_args[6], bla, "usdt12_arg7"); 181 ASSERT_EQ(bss->usdt12_args[7], (uintptr_t)&bla, "usdt12_arg8"); 182 ASSERT_EQ(bss->usdt12_args[8], -9, "usdt12_arg9"); 183 ASSERT_EQ(bss->usdt12_args[9], nums[1], "usdt12_arg10"); 184 ASSERT_EQ(bss->usdt12_args[10], nums[idx], "usdt12_arg11"); 185 ASSERT_EQ(bss->usdt12_args[11], t1.y, "usdt12_arg12"); 186 187 int usdt12_expected_arg_sizes[12] = { 4, 4, 8, 8, 4, 8, 8, 8, 4, 2, 2, 1 }; 188 189 for (i = 0; i < 12; i++) 190 ASSERT_EQ(bss->usdt12_arg_sizes[i], usdt12_expected_arg_sizes[i], "usdt12_arg_size"); 191 192 /* trigger_func() is marked __always_inline, so USDT invocations will be 193 * inlined in two different places, meaning that each USDT will have 194 * at least 2 different places to be attached to. This verifies that 195 * bpf_program__attach_usdt() handles this properly and attaches to 196 * all possible places of USDT invocation. 197 */ 198 called += TRIGGER(2); 199 200 ASSERT_EQ(bss->usdt0_called, called, "usdt0_called"); 201 ASSERT_EQ(bss->usdt3_called, called, "usdt3_called"); 202 ASSERT_EQ(bss->usdt12_called, called, "usdt12_called"); 203 204 /* only check values that depend on trigger_func()'s input value */ 205 ASSERT_EQ(bss->usdt3_args[0], 2, "usdt3_arg1"); 206 207 ASSERT_EQ(bss->usdt12_args[0], 2, "usdt12_arg1"); 208 ASSERT_EQ(bss->usdt12_args[1], 2 + 1, "usdt12_arg2"); 209 ASSERT_EQ(bss->usdt12_args[3], 42 + 2, "usdt12_arg4"); 210 ASSERT_EQ(bss->usdt12_args[9], nums[2], "usdt12_arg10"); 211 212 /* detach and re-attach usdt3 */ 213 bpf_link__destroy(skel->links.usdt3); 214 215 opts.usdt_cookie = 0xBADC00C51E; 216 skel->links.usdt3 = bpf_program__attach_usdt(skel->progs.usdt3, -1 /* any pid */, 217 "/proc/self/exe", "test", "usdt3", &opts); 218 if (!ASSERT_OK_PTR(skel->links.usdt3, "usdt3_reattach")) 219 goto cleanup; 220 221 called += TRIGGER(3); 222 223 ASSERT_EQ(bss->usdt3_called, called, "usdt3_called"); 224 /* this time usdt3 has custom cookie */ 225 ASSERT_EQ(bss->usdt3_cookie, 0xBADC00C51E, "usdt3_cookie"); 226 ASSERT_EQ(bss->usdt3_arg_cnt, 3, "usdt3_arg_cnt"); 227 228 ASSERT_EQ(bss->usdt3_arg_rets[0], 0, "usdt3_arg1_ret"); 229 ASSERT_EQ(bss->usdt3_arg_rets[1], 0, "usdt3_arg2_ret"); 230 ASSERT_EQ(bss->usdt3_arg_rets[2], 0, "usdt3_arg3_ret"); 231 ASSERT_EQ(bss->usdt3_args[0], 3, "usdt3_arg1"); 232 ASSERT_EQ(bss->usdt3_args[1], 42, "usdt3_arg2"); 233 ASSERT_EQ(bss->usdt3_args[2], (uintptr_t)&bla, "usdt3_arg3"); 234 235 #if defined(__x86_64__) || defined(__i386__) 236 trigger_sib_spec(); 237 ASSERT_EQ(bss->usdt_sib_called, 1, "usdt_sib_called"); 238 ASSERT_EQ(bss->usdt_sib_cookie, expected_cookie, "usdt_sib_cookie"); 239 ASSERT_EQ(bss->usdt_sib_arg_cnt, 1, "usdt_sib_arg_cnt"); 240 ASSERT_EQ(bss->usdt_sib_arg, nums[0], "usdt_sib_arg"); 241 ASSERT_EQ(bss->usdt_sib_arg_ret, 0, "usdt_sib_arg_ret"); 242 ASSERT_EQ(bss->usdt_sib_arg_size, sizeof(nums[0]), "usdt_sib_arg_size"); 243 #endif 244 245 cleanup: 246 test_usdt__destroy(skel); 247 #undef TRIGGER 248 } 249 250 #ifdef __x86_64__ 251 extern void usdt_1(void); 252 extern void usdt_2(void); 253 254 static unsigned char nop1[1] = { 0x90 }; 255 static unsigned char nop1_nop5_combo[6] = { 0x90, 0x0f, 0x1f, 0x44, 0x00, 0x00 }; 256 257 static void *find_instr(void *fn, unsigned char *instr, size_t cnt) 258 { 259 int i; 260 261 for (i = 0; i < 10; i++) { 262 if (!memcmp(instr, fn + i, cnt)) 263 return fn + i; 264 } 265 return NULL; 266 } 267 268 static void subtest_optimized_attach(void) 269 { 270 struct test_usdt *skel; 271 __u8 *addr_1, *addr_2; 272 273 /* usdt_1 USDT probe has single nop instruction */ 274 addr_1 = find_instr(usdt_1, nop1_nop5_combo, 6); 275 if (!ASSERT_NULL(addr_1, "usdt_1_find_nop1_nop5_combo")) 276 return; 277 278 addr_1 = find_instr(usdt_1, nop1, 1); 279 if (!ASSERT_OK_PTR(addr_1, "usdt_1_find_nop1")) 280 return; 281 282 /* usdt_2 USDT probe has nop,nop5 instructions combo */ 283 addr_2 = find_instr(usdt_2, nop1_nop5_combo, 6); 284 if (!ASSERT_OK_PTR(addr_2, "usdt_2_find_nop1_nop5_combo")) 285 return; 286 287 skel = test_usdt__open_and_load(); 288 if (!ASSERT_OK_PTR(skel, "test_usdt__open_and_load")) 289 return; 290 291 skel->bss->expected_ip = (unsigned long) addr_1; 292 293 /* 294 * Attach program on top of usdt_1 which is single nop probe, 295 * so the probe won't get optimized. 296 */ 297 skel->links.usdt_executed = bpf_program__attach_usdt(skel->progs.usdt_executed, 298 0 /*self*/, "/proc/self/exe", 299 "optimized_attach", "usdt_1", NULL); 300 if (!ASSERT_OK_PTR(skel->links.usdt_executed, "bpf_program__attach_usdt")) 301 goto cleanup; 302 303 usdt_1(); 304 usdt_1(); 305 306 /* int3 is on addr_1 address */ 307 ASSERT_EQ(*addr_1, 0xcc, "int3"); 308 ASSERT_EQ(skel->bss->executed, 2, "executed"); 309 310 bpf_link__destroy(skel->links.usdt_executed); 311 312 /* we expect the nop5 ip */ 313 skel->bss->expected_ip = (unsigned long) addr_2 + 1; 314 315 /* 316 * Attach program on top of usdt_2 which is probe defined on top 317 * of nop1,nop5 combo, so the probe gets optimized on top of nop5. 318 */ 319 skel->links.usdt_executed = bpf_program__attach_usdt(skel->progs.usdt_executed, 320 0 /*self*/, "/proc/self/exe", 321 "optimized_attach", "usdt_2", NULL); 322 if (!ASSERT_OK_PTR(skel->links.usdt_executed, "bpf_program__attach_usdt")) 323 goto cleanup; 324 325 usdt_2(); 326 usdt_2(); 327 328 /* nop stays on addr_2 address */ 329 ASSERT_EQ(*addr_2, 0x90, "nop"); 330 331 /* call is on addr_2 + 1 address */ 332 ASSERT_EQ(*(addr_2 + 1), 0xe8, "call"); 333 ASSERT_EQ(skel->bss->executed, 4, "executed"); 334 335 cleanup: 336 test_usdt__destroy(skel); 337 } 338 #endif 339 340 unsigned short test_usdt_100_semaphore SEC(".probes"); 341 unsigned short test_usdt_300_semaphore SEC(".probes"); 342 unsigned short test_usdt_400_semaphore SEC(".probes"); 343 344 #define R10(F, X) F(X+0); F(X+1);F(X+2); F(X+3); F(X+4); \ 345 F(X+5); F(X+6); F(X+7); F(X+8); F(X+9); 346 #define R100(F, X) R10(F,X+ 0);R10(F,X+10);R10(F,X+20);R10(F,X+30);R10(F,X+40); \ 347 R10(F,X+50);R10(F,X+60);R10(F,X+70);R10(F,X+80);R10(F,X+90); 348 349 /* carefully control that we get exactly 100 inlines by preventing inlining */ 350 static void __always_inline f100(int x) 351 { 352 STAP_PROBE1(test, usdt_100, x); 353 } 354 355 __weak void trigger_100_usdts(void) 356 { 357 R100(f100, 0); 358 } 359 360 /* we shouldn't be able to attach to test:usdt2_300 USDT as we don't have as 361 * many slots for specs. It's important that each STAP_PROBE2() invocation 362 * (after untolling) gets different arg spec due to compiler inlining i as 363 * a constant 364 */ 365 static void __always_inline f300(int x) 366 { 367 STAP_PROBE1(test, usdt_300, x); 368 } 369 370 __weak void trigger_300_usdts(void) 371 { 372 R100(f300, 0); 373 R100(f300, 100); 374 R100(f300, 200); 375 } 376 377 static void __always_inline f400(int x __attribute__((unused))) 378 { 379 STAP_PROBE1(test, usdt_400, 400); 380 } 381 382 /* this time we have 400 different USDT call sites, but they have uniform 383 * argument location, so libbpf's spec string deduplication logic should keep 384 * spec count use very small and so we should be able to attach to all 400 385 * call sites 386 */ 387 __weak void trigger_400_usdts(void) 388 { 389 R100(f400, 0); 390 R100(f400, 100); 391 R100(f400, 200); 392 R100(f400, 300); 393 } 394 395 static void subtest_multispec_usdt(void) 396 { 397 LIBBPF_OPTS(bpf_usdt_opts, opts); 398 struct test_usdt *skel; 399 struct test_usdt__bss *bss; 400 int err, i; 401 402 skel = test_usdt__open_and_load(); 403 if (!ASSERT_OK_PTR(skel, "skel_open")) 404 return; 405 406 bss = skel->bss; 407 bss->my_pid = getpid(); 408 409 err = test_usdt__attach(skel); 410 if (!ASSERT_OK(err, "skel_attach")) 411 goto cleanup; 412 413 /* usdt_100 is auto-attached and there are 100 inlined call sites, 414 * let's validate that all of them are properly attached to and 415 * handled from BPF side 416 */ 417 trigger_100_usdts(); 418 419 ASSERT_EQ(bss->usdt_100_called, 100, "usdt_100_called"); 420 ASSERT_EQ(bss->usdt_100_sum, 99 * 100 / 2, "usdt_100_sum"); 421 422 /* Stress test free spec ID tracking. By default libbpf allows up to 423 * 256 specs to be used, so if we don't return free spec IDs back 424 * after few detachments and re-attachments we should run out of 425 * available spec IDs. 426 */ 427 for (i = 0; i < 2; i++) { 428 bpf_link__destroy(skel->links.usdt_100); 429 430 skel->links.usdt_100 = bpf_program__attach_usdt(skel->progs.usdt_100, -1, 431 "/proc/self/exe", 432 "test", "usdt_100", NULL); 433 if (!ASSERT_OK_PTR(skel->links.usdt_100, "usdt_100_reattach")) 434 goto cleanup; 435 436 bss->usdt_100_sum = 0; 437 trigger_100_usdts(); 438 439 ASSERT_EQ(bss->usdt_100_called, (i + 1) * 100 + 100, "usdt_100_called"); 440 ASSERT_EQ(bss->usdt_100_sum, 99 * 100 / 2, "usdt_100_sum"); 441 } 442 443 /* Now let's step it up and try to attach USDT that requires more than 444 * 256 attach points with different specs for each. 445 * Note that we need trigger_300_usdts() only to actually have 300 446 * USDT call sites, we are not going to actually trace them. 447 */ 448 trigger_300_usdts(); 449 450 bpf_link__destroy(skel->links.usdt_100); 451 452 bss->usdt_100_called = 0; 453 bss->usdt_100_sum = 0; 454 455 /* If built with arm64/clang, there will be much less number of specs 456 * for usdt_300 call sites. 457 */ 458 #if !defined(__aarch64__) || !defined(__clang__) 459 /* we'll reuse usdt_100 BPF program for usdt_300 test */ 460 skel->links.usdt_100 = bpf_program__attach_usdt(skel->progs.usdt_100, -1, "/proc/self/exe", 461 "test", "usdt_300", NULL); 462 err = -errno; 463 if (!ASSERT_ERR_PTR(skel->links.usdt_100, "usdt_300_bad_attach")) 464 goto cleanup; 465 ASSERT_EQ(err, -E2BIG, "usdt_300_attach_err"); 466 467 /* let's check that there are no "dangling" BPF programs attached due 468 * to partial success of the above test:usdt_300 attachment 469 */ 470 f300(777); /* this is 301st instance of usdt_300 */ 471 472 ASSERT_EQ(bss->usdt_100_called, 0, "usdt_301_called"); 473 ASSERT_EQ(bss->usdt_100_sum, 0, "usdt_301_sum"); 474 #endif 475 476 /* This time we have USDT with 400 inlined invocations, but arg specs 477 * should be the same across all sites, so libbpf will only need to 478 * use one spec and thus we'll be able to attach 400 uprobes 479 * successfully. 480 * 481 * Again, we are reusing usdt_100 BPF program. 482 */ 483 skel->links.usdt_100 = bpf_program__attach_usdt(skel->progs.usdt_100, -1, 484 "/proc/self/exe", 485 "test", "usdt_400", NULL); 486 if (!ASSERT_OK_PTR(skel->links.usdt_100, "usdt_400_attach")) 487 goto cleanup; 488 489 trigger_400_usdts(); 490 491 ASSERT_EQ(bss->usdt_100_called, 400, "usdt_400_called"); 492 ASSERT_EQ(bss->usdt_100_sum, 400 * 400, "usdt_400_sum"); 493 494 cleanup: 495 test_usdt__destroy(skel); 496 } 497 498 static FILE *urand_spawn(int *pid) 499 { 500 FILE *f; 501 502 /* urandom_read's stdout is wired into f */ 503 f = popen("./urandom_read 1 report-pid", "r"); 504 if (!f) 505 return NULL; 506 507 if (fscanf(f, "%d", pid) != 1) { 508 pclose(f); 509 errno = EINVAL; 510 return NULL; 511 } 512 513 return f; 514 } 515 516 static int urand_trigger(FILE **urand_pipe) 517 { 518 int exit_code; 519 520 /* pclose() waits for child process to exit and returns their exit code */ 521 exit_code = pclose(*urand_pipe); 522 *urand_pipe = NULL; 523 524 return exit_code; 525 } 526 527 static void subtest_urandom_usdt(bool auto_attach) 528 { 529 struct test_urandom_usdt *skel; 530 struct test_urandom_usdt__bss *bss; 531 struct bpf_link *l; 532 FILE *urand_pipe = NULL; 533 int err, urand_pid = 0; 534 535 skel = test_urandom_usdt__open_and_load(); 536 if (!ASSERT_OK_PTR(skel, "skel_open")) 537 return; 538 539 urand_pipe = urand_spawn(&urand_pid); 540 if (!ASSERT_OK_PTR(urand_pipe, "urand_spawn")) 541 goto cleanup; 542 543 bss = skel->bss; 544 bss->urand_pid = urand_pid; 545 546 if (auto_attach) { 547 err = test_urandom_usdt__attach(skel); 548 if (!ASSERT_OK(err, "skel_auto_attach")) 549 goto cleanup; 550 } else { 551 l = bpf_program__attach_usdt(skel->progs.urand_read_without_sema, 552 urand_pid, "./urandom_read", 553 "urand", "read_without_sema", NULL); 554 if (!ASSERT_OK_PTR(l, "urand_without_sema_attach")) 555 goto cleanup; 556 skel->links.urand_read_without_sema = l; 557 558 l = bpf_program__attach_usdt(skel->progs.urand_read_with_sema, 559 urand_pid, "./urandom_read", 560 "urand", "read_with_sema", NULL); 561 if (!ASSERT_OK_PTR(l, "urand_with_sema_attach")) 562 goto cleanup; 563 skel->links.urand_read_with_sema = l; 564 565 l = bpf_program__attach_usdt(skel->progs.urandlib_read_without_sema, 566 urand_pid, "./liburandom_read.so", 567 "urandlib", "read_without_sema", NULL); 568 if (!ASSERT_OK_PTR(l, "urandlib_without_sema_attach")) 569 goto cleanup; 570 skel->links.urandlib_read_without_sema = l; 571 572 l = bpf_program__attach_usdt(skel->progs.urandlib_read_with_sema, 573 urand_pid, "./liburandom_read.so", 574 "urandlib", "read_with_sema", NULL); 575 if (!ASSERT_OK_PTR(l, "urandlib_with_sema_attach")) 576 goto cleanup; 577 skel->links.urandlib_read_with_sema = l; 578 579 } 580 581 /* trigger urandom_read USDTs */ 582 ASSERT_OK(urand_trigger(&urand_pipe), "urand_exit_code"); 583 584 ASSERT_EQ(bss->urand_read_without_sema_call_cnt, 1, "urand_wo_sema_cnt"); 585 ASSERT_EQ(bss->urand_read_without_sema_buf_sz_sum, 256, "urand_wo_sema_sum"); 586 587 ASSERT_EQ(bss->urand_read_with_sema_call_cnt, 1, "urand_w_sema_cnt"); 588 ASSERT_EQ(bss->urand_read_with_sema_buf_sz_sum, 256, "urand_w_sema_sum"); 589 590 ASSERT_EQ(bss->urandlib_read_without_sema_call_cnt, 1, "urandlib_wo_sema_cnt"); 591 ASSERT_EQ(bss->urandlib_read_without_sema_buf_sz_sum, 256, "urandlib_wo_sema_sum"); 592 593 ASSERT_EQ(bss->urandlib_read_with_sema_call_cnt, 1, "urandlib_w_sema_cnt"); 594 ASSERT_EQ(bss->urandlib_read_with_sema_buf_sz_sum, 256, "urandlib_w_sema_sum"); 595 596 cleanup: 597 if (urand_pipe) 598 pclose(urand_pipe); 599 test_urandom_usdt__destroy(skel); 600 } 601 602 void test_usdt(void) 603 { 604 if (test__start_subtest("basic")) 605 subtest_basic_usdt(false); 606 #ifdef __x86_64__ 607 if (test__start_subtest("basic_optimized")) 608 subtest_basic_usdt(true); 609 if (test__start_subtest("optimized_attach")) 610 subtest_optimized_attach(); 611 #endif 612 if (test__start_subtest("multispec")) 613 subtest_multispec_usdt(); 614 if (test__start_subtest("urand_auto_attach")) 615 subtest_urandom_usdt(true /* auto_attach */); 616 if (test__start_subtest("urand_pid_attach")) 617 subtest_urandom_usdt(false /* auto_attach */); 618 } 619