1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <bpf/btf.h>
4
5 static int duration = 0;
6
btf_dump_printf(void * ctx,const char * fmt,va_list args)7 void btf_dump_printf(void *ctx, const char *fmt, va_list args)
8 {
9 vfprintf(ctx, fmt, args);
10 }
11
12 static struct btf_dump_test_case {
13 const char *name;
14 const char *file;
15 bool known_ptr_sz;
16 } btf_dump_test_cases[] = {
17 {"btf_dump: syntax", "btf_dump_test_case_syntax", true},
18 {"btf_dump: ordering", "btf_dump_test_case_ordering", false},
19 {"btf_dump: padding", "btf_dump_test_case_padding", true},
20 {"btf_dump: packing", "btf_dump_test_case_packing", true},
21 {"btf_dump: bitfields", "btf_dump_test_case_bitfields", true},
22 {"btf_dump: multidim", "btf_dump_test_case_multidim", false},
23 {"btf_dump: namespacing", "btf_dump_test_case_namespacing", false},
24 };
25
btf_dump_all_types(const struct btf * btf,void * ctx)26 static int btf_dump_all_types(const struct btf *btf, void *ctx)
27 {
28 size_t type_cnt = btf__type_cnt(btf);
29 struct btf_dump *d;
30 int err = 0, id;
31
32 d = btf_dump__new(btf, btf_dump_printf, ctx, NULL);
33 err = libbpf_get_error(d);
34 if (err)
35 return err;
36
37 for (id = 1; id < type_cnt; id++) {
38 err = btf_dump__dump_type(d, id);
39 if (err)
40 goto done;
41 }
42
43 done:
44 btf_dump__free(d);
45 return err;
46 }
47
test_btf_dump_case(int n,struct btf_dump_test_case * t)48 static int test_btf_dump_case(int n, struct btf_dump_test_case *t)
49 {
50 char test_file[256], out_file[256], diff_cmd[1024];
51 struct btf *btf = NULL;
52 int err = 0, fd = -1;
53 FILE *f = NULL;
54
55 snprintf(test_file, sizeof(test_file), "%s.bpf.o", t->file);
56
57 btf = btf__parse_elf(test_file, NULL);
58 if (!ASSERT_OK_PTR(btf, "btf_parse_elf")) {
59 err = -PTR_ERR(btf);
60 btf = NULL;
61 goto done;
62 }
63
64 /* tests with t->known_ptr_sz have no "long" or "unsigned long" type,
65 * so it's impossible to determine correct pointer size; but if they
66 * do, it should be 8 regardless of host architecture, becaues BPF
67 * target is always 64-bit
68 */
69 if (!t->known_ptr_sz) {
70 btf__set_pointer_size(btf, 8);
71 } else {
72 CHECK(btf__pointer_size(btf) != 8, "ptr_sz", "exp %d, got %zu\n",
73 8, btf__pointer_size(btf));
74 }
75
76 snprintf(out_file, sizeof(out_file), "/tmp/%s.output.XXXXXX", t->file);
77 fd = mkstemp(out_file);
78 if (!ASSERT_GE(fd, 0, "create_tmp")) {
79 err = fd;
80 goto done;
81 }
82 f = fdopen(fd, "w");
83 if (CHECK(f == NULL, "open_tmp", "failed to open file: %s(%d)\n",
84 strerror(errno), errno)) {
85 close(fd);
86 goto done;
87 }
88
89 err = btf_dump_all_types(btf, f);
90 fclose(f);
91 close(fd);
92 if (CHECK(err, "btf_dump", "failure during C dumping: %d\n", err)) {
93 goto done;
94 }
95
96 snprintf(test_file, sizeof(test_file), "progs/%s.c", t->file);
97 if (access(test_file, R_OK) == -1)
98 /*
99 * When the test is run with O=, kselftest copies TEST_FILES
100 * without preserving the directory structure.
101 */
102 snprintf(test_file, sizeof(test_file), "%s.c", t->file);
103 /*
104 * Diff test output and expected test output, contained between
105 * START-EXPECTED-OUTPUT and END-EXPECTED-OUTPUT lines in test case.
106 * For expected output lines, everything before '*' is stripped out.
107 * Also lines containing comment start and comment end markers are
108 * ignored.
109 */
110 snprintf(diff_cmd, sizeof(diff_cmd),
111 "awk '/START-EXPECTED-OUTPUT/{out=1;next} "
112 "/END-EXPECTED-OUTPUT/{out=0} "
113 "/\\/\\*|\\*\\//{next} " /* ignore comment start/end lines */
114 "out {sub(/^[ \\t]*\\*/, \"\"); print}' '%s' | diff -u - '%s'",
115 test_file, out_file);
116 err = system(diff_cmd);
117 if (CHECK(err, "diff",
118 "differing test output, output=%s, err=%d, diff cmd:\n%s\n",
119 out_file, err, diff_cmd))
120 goto done;
121
122 remove(out_file);
123
124 done:
125 btf__free(btf);
126 return err;
127 }
128
129 static char *dump_buf;
130 static size_t dump_buf_sz;
131 static FILE *dump_buf_file;
132
test_btf_dump_incremental(void)133 static void test_btf_dump_incremental(void)
134 {
135 struct btf *btf = NULL;
136 struct btf_dump *d = NULL;
137 int id, err, i;
138
139 dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
140 if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
141 return;
142 btf = btf__new_empty();
143 if (!ASSERT_OK_PTR(btf, "new_empty"))
144 goto err_out;
145 d = btf_dump__new(btf, btf_dump_printf, dump_buf_file, NULL);
146 if (!ASSERT_OK(libbpf_get_error(d), "btf_dump__new"))
147 goto err_out;
148
149 /* First, generate BTF corresponding to the following C code:
150 *
151 * enum x;
152 *
153 * enum x { X = 1 };
154 *
155 * enum { Y = 1 };
156 *
157 * struct s;
158 *
159 * struct s { int x; };
160 *
161 */
162 id = btf__add_enum(btf, "x", 4);
163 ASSERT_EQ(id, 1, "enum_declaration_id");
164 id = btf__add_enum(btf, "x", 4);
165 ASSERT_EQ(id, 2, "named_enum_id");
166 err = btf__add_enum_value(btf, "X", 1);
167 ASSERT_OK(err, "named_enum_val_ok");
168
169 id = btf__add_enum(btf, NULL, 4);
170 ASSERT_EQ(id, 3, "anon_enum_id");
171 err = btf__add_enum_value(btf, "Y", 1);
172 ASSERT_OK(err, "anon_enum_val_ok");
173
174 id = btf__add_int(btf, "int", 4, BTF_INT_SIGNED);
175 ASSERT_EQ(id, 4, "int_id");
176
177 id = btf__add_fwd(btf, "s", BTF_FWD_STRUCT);
178 ASSERT_EQ(id, 5, "fwd_id");
179
180 id = btf__add_struct(btf, "s", 4);
181 ASSERT_EQ(id, 6, "struct_id");
182 err = btf__add_field(btf, "x", 4, 0, 0);
183 ASSERT_OK(err, "field_ok");
184
185 for (i = 1; i < btf__type_cnt(btf); i++) {
186 err = btf_dump__dump_type(d, i);
187 ASSERT_OK(err, "dump_type_ok");
188 }
189
190 fflush(dump_buf_file);
191 dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
192
193 ASSERT_STREQ(dump_buf,
194 "enum x;\n"
195 "\n"
196 "enum x {\n"
197 " X = 1,\n"
198 "};\n"
199 "\n"
200 "enum {\n"
201 " Y = 1,\n"
202 "};\n"
203 "\n"
204 "struct s;\n"
205 "\n"
206 "struct s {\n"
207 " int x;\n"
208 "};\n\n", "c_dump1");
209
210 /* Now, after dumping original BTF, append another struct that embeds
211 * anonymous enum. It also has a name conflict with the first struct:
212 *
213 * struct s___2 {
214 * enum { VAL___2 = 1 } x;
215 * struct s s;
216 * };
217 *
218 * This will test that btf_dump'er maintains internal state properly.
219 * Note that VAL___2 enum value. It's because we've already emitted
220 * that enum as a global anonymous enum, so btf_dump will ensure that
221 * enum values don't conflict;
222 *
223 */
224 fseek(dump_buf_file, 0, SEEK_SET);
225
226 id = btf__add_struct(btf, "s", 4);
227 ASSERT_EQ(id, 7, "struct_id");
228 err = btf__add_field(btf, "x", 2, 0, 0);
229 ASSERT_OK(err, "field_ok");
230 err = btf__add_field(btf, "y", 3, 32, 0);
231 ASSERT_OK(err, "field_ok");
232 err = btf__add_field(btf, "s", 6, 64, 0);
233 ASSERT_OK(err, "field_ok");
234
235 for (i = 1; i < btf__type_cnt(btf); i++) {
236 err = btf_dump__dump_type(d, i);
237 ASSERT_OK(err, "dump_type_ok");
238 }
239
240 fflush(dump_buf_file);
241 dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
242 ASSERT_STREQ(dump_buf,
243 "struct s___2 {\n"
244 " enum x x;\n"
245 " enum {\n"
246 " Y___2 = 1,\n"
247 " } y;\n"
248 " struct s s;\n"
249 "};\n\n" , "c_dump1");
250
251 err_out:
252 fclose(dump_buf_file);
253 free(dump_buf);
254 btf_dump__free(d);
255 btf__free(btf);
256 }
257
258 #define STRSIZE 4096
259
btf_dump_snprintf(void * ctx,const char * fmt,va_list args)260 static void btf_dump_snprintf(void *ctx, const char *fmt, va_list args)
261 {
262 char *s = ctx, new[STRSIZE];
263
264 vsnprintf(new, STRSIZE, fmt, args);
265 if (strlen(s) < STRSIZE)
266 strncat(s, new, STRSIZE - strlen(s) - 1);
267 }
268
btf_dump_data(struct btf * btf,struct btf_dump * d,char * name,char * prefix,__u64 flags,void * ptr,size_t ptr_sz,char * str,const char * expected_val)269 static int btf_dump_data(struct btf *btf, struct btf_dump *d,
270 char *name, char *prefix, __u64 flags, void *ptr,
271 size_t ptr_sz, char *str, const char *expected_val)
272 {
273 DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
274 size_t type_sz;
275 __s32 type_id;
276 int ret = 0;
277
278 if (flags & BTF_F_COMPACT)
279 opts.compact = true;
280 if (flags & BTF_F_NONAME)
281 opts.skip_names = true;
282 if (flags & BTF_F_ZERO)
283 opts.emit_zeroes = true;
284 if (prefix) {
285 ASSERT_STRNEQ(name, prefix, strlen(prefix),
286 "verify prefix match");
287 name += strlen(prefix) + 1;
288 }
289 type_id = btf__find_by_name(btf, name);
290 if (!ASSERT_GE(type_id, 0, "find type id"))
291 return -ENOENT;
292 type_sz = btf__resolve_size(btf, type_id);
293 str[0] = '\0';
294 ret = btf_dump__dump_type_data(d, type_id, ptr, ptr_sz, &opts);
295 if (type_sz <= ptr_sz) {
296 if (!ASSERT_EQ(ret, type_sz, "failed/unexpected type_sz"))
297 return -EINVAL;
298 } else {
299 if (!ASSERT_EQ(ret, -E2BIG, "failed to return -E2BIG"))
300 return -EINVAL;
301 }
302 if (!ASSERT_STREQ(str, expected_val, "ensure expected/actual match"))
303 return -EFAULT;
304 return 0;
305 }
306
307 #define TEST_BTF_DUMP_DATA(_b, _d, _prefix, _str, _type, _flags, \
308 _expected, ...) \
309 do { \
310 char __ptrtype[64] = #_type; \
311 char *_ptrtype = (char *)__ptrtype; \
312 _type _ptrdata = __VA_ARGS__; \
313 void *_ptr = &_ptrdata; \
314 \
315 (void) btf_dump_data(_b, _d, _ptrtype, _prefix, _flags, \
316 _ptr, sizeof(_type), _str, \
317 _expected); \
318 } while (0)
319
320 /* Use where expected data string matches its stringified declaration */
321 #define TEST_BTF_DUMP_DATA_C(_b, _d, _prefix, _str, _type, _flags, \
322 ...) \
323 TEST_BTF_DUMP_DATA(_b, _d, _prefix, _str, _type, _flags, \
324 "(" #_type ")" #__VA_ARGS__, __VA_ARGS__)
325
326 /* overflow test; pass typesize < expected type size, ensure E2BIG returned */
327 #define TEST_BTF_DUMP_DATA_OVER(_b, _d, _prefix, _str, _type, _type_sz, \
328 _expected, ...) \
329 do { \
330 char __ptrtype[64] = #_type; \
331 char *_ptrtype = (char *)__ptrtype; \
332 _type _ptrdata = __VA_ARGS__; \
333 void *_ptr = &_ptrdata; \
334 \
335 (void) btf_dump_data(_b, _d, _ptrtype, _prefix, 0, \
336 _ptr, _type_sz, _str, _expected); \
337 } while (0)
338
339 #define TEST_BTF_DUMP_VAR(_b, _d, _prefix, _str, _var, _type, _flags, \
340 _expected, ...) \
341 do { \
342 _type _ptrdata = __VA_ARGS__; \
343 void *_ptr = &_ptrdata; \
344 \
345 (void) btf_dump_data(_b, _d, _var, _prefix, _flags, \
346 _ptr, sizeof(_type), _str, \
347 _expected); \
348 } while (0)
349
test_btf_dump_int_data(struct btf * btf,struct btf_dump * d,char * str)350 static void test_btf_dump_int_data(struct btf *btf, struct btf_dump *d,
351 char *str)
352 {
353 #ifdef __SIZEOF_INT128__
354 unsigned __int128 i = 0xffffffffffffffff;
355
356 /* this dance is required because we cannot directly initialize
357 * a 128-bit value to anything larger than a 64-bit value.
358 */
359 i = (i << 64) | (i - 1);
360 #endif
361 /* simple int */
362 TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, 1234);
363 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
364 "1234", 1234);
365 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)1234", 1234);
366
367 /* zero value should be printed at toplevel */
368 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT, "(int)0", 0);
369 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
370 "0", 0);
371 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_ZERO,
372 "(int)0", 0);
373 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int,
374 BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
375 "0", 0);
376 TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, -4567);
377 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
378 "-4567", -4567);
379 TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)-4567", -4567);
380
381 TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, int, sizeof(int)-1, "", 1);
382
383 #ifdef __SIZEOF_INT128__
384 /* gcc encode unsigned __int128 type with name "__int128 unsigned" in dwarf,
385 * and clang encode it with name "unsigned __int128" in dwarf.
386 * Do an availability test for either variant before doing actual test.
387 */
388 if (btf__find_by_name(btf, "unsigned __int128") > 0) {
389 TEST_BTF_DUMP_DATA(btf, d, NULL, str, unsigned __int128, BTF_F_COMPACT,
390 "(unsigned __int128)0xffffffffffffffff",
391 0xffffffffffffffff);
392 ASSERT_OK(btf_dump_data(btf, d, "unsigned __int128", NULL, 0, &i, 16, str,
393 "(unsigned __int128)0xfffffffffffffffffffffffffffffffe"),
394 "dump unsigned __int128");
395 } else if (btf__find_by_name(btf, "__int128 unsigned") > 0) {
396 TEST_BTF_DUMP_DATA(btf, d, NULL, str, __int128 unsigned, BTF_F_COMPACT,
397 "(__int128 unsigned)0xffffffffffffffff",
398 0xffffffffffffffff);
399 ASSERT_OK(btf_dump_data(btf, d, "__int128 unsigned", NULL, 0, &i, 16, str,
400 "(__int128 unsigned)0xfffffffffffffffffffffffffffffffe"),
401 "dump unsigned __int128");
402 } else {
403 ASSERT_TRUE(false, "unsigned_int128_not_found");
404 }
405 #endif
406 }
407
test_btf_dump_float_data(struct btf * btf,struct btf_dump * d,char * str)408 static void test_btf_dump_float_data(struct btf *btf, struct btf_dump *d,
409 char *str)
410 {
411 float t1 = 1.234567;
412 float t2 = -1.234567;
413 float t3 = 0.0;
414 double t4 = 5.678912;
415 double t5 = -5.678912;
416 double t6 = 0.0;
417 long double t7 = 9.876543;
418 long double t8 = -9.876543;
419 long double t9 = 0.0;
420
421 /* since the kernel does not likely have any float types in its BTF, we
422 * will need to add some of various sizes.
423 */
424
425 ASSERT_GT(btf__add_float(btf, "test_float", 4), 0, "add float");
426 ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t1, 4, str,
427 "(test_float)1.234567"), "dump float");
428 ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t2, 4, str,
429 "(test_float)-1.234567"), "dump float");
430 ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t3, 4, str,
431 "(test_float)0.000000"), "dump float");
432
433 ASSERT_GT(btf__add_float(btf, "test_double", 8), 0, "add_double");
434 ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t4, 8, str,
435 "(test_double)5.678912"), "dump double");
436 ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t5, 8, str,
437 "(test_double)-5.678912"), "dump double");
438 ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t6, 8, str,
439 "(test_double)0.000000"), "dump double");
440
441 ASSERT_GT(btf__add_float(btf, "test_long_double", 16), 0, "add long double");
442 ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t7, 16,
443 str, "(test_long_double)9.876543"),
444 "dump long_double");
445 ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t8, 16,
446 str, "(test_long_double)-9.876543"),
447 "dump long_double");
448 ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t9, 16,
449 str, "(test_long_double)0.000000"),
450 "dump long_double");
451 }
452
test_btf_dump_char_data(struct btf * btf,struct btf_dump * d,char * str)453 static void test_btf_dump_char_data(struct btf *btf, struct btf_dump *d,
454 char *str)
455 {
456 /* simple char */
457 TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, char, BTF_F_COMPACT, 100);
458 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME,
459 "100", 100);
460 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, 0, "(char)100", 100);
461 /* zero value should be printed at toplevel */
462 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT,
463 "(char)0", 0);
464 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME,
465 "0", 0);
466 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_ZERO,
467 "(char)0", 0);
468 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
469 "0", 0);
470 TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, 0, "(char)0", 0);
471
472 TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, char, sizeof(char)-1, "", 100);
473 }
474
test_btf_dump_typedef_data(struct btf * btf,struct btf_dump * d,char * str)475 static void test_btf_dump_typedef_data(struct btf *btf, struct btf_dump *d,
476 char *str)
477 {
478 /* simple typedef */
479 TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, uint64_t, BTF_F_COMPACT, 100);
480 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
481 "1", 1);
482 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, 0, "(u64)1", 1);
483 /* zero value should be printed at toplevel */
484 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT, "(u64)0", 0);
485 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
486 "0", 0);
487 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_ZERO,
488 "(u64)0", 0);
489 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64,
490 BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
491 "0", 0);
492 TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, 0, "(u64)0", 0);
493
494 /* typedef struct */
495 TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, atomic_t, BTF_F_COMPACT,
496 {.counter = (int)1,});
497 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
498 "{1,}", { .counter = 1 });
499 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, 0,
500 "(atomic_t){\n"
501 " .counter = (int)1,\n"
502 "}",
503 {.counter = 1,});
504 /* typedef with 0 value should be printed at toplevel */
505 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT, "(atomic_t){}",
506 {.counter = 0,});
507 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
508 "{}", {.counter = 0,});
509 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, 0,
510 "(atomic_t){\n"
511 "}",
512 {.counter = 0,});
513 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_ZERO,
514 "(atomic_t){.counter = (int)0,}",
515 {.counter = 0,});
516 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t,
517 BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
518 "{0,}", {.counter = 0,});
519 TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_ZERO,
520 "(atomic_t){\n"
521 " .counter = (int)0,\n"
522 "}",
523 { .counter = 0,});
524
525 /* overflow should show type but not value since it overflows */
526 TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, atomic_t, sizeof(atomic_t)-1,
527 "(atomic_t){\n", { .counter = 1});
528 }
529
test_btf_dump_enum_data(struct btf * btf,struct btf_dump * d,char * str)530 static void test_btf_dump_enum_data(struct btf *btf, struct btf_dump *d,
531 char *str)
532 {
533 /* enum where enum value does (and does not) exist */
534 TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
535 BPF_MAP_CREATE);
536 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
537 "(enum bpf_cmd)BPF_MAP_CREATE", 0);
538 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
539 BTF_F_COMPACT | BTF_F_NONAME,
540 "BPF_MAP_CREATE",
541 BPF_MAP_CREATE);
542 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, 0,
543 "(enum bpf_cmd)BPF_MAP_CREATE",
544 BPF_MAP_CREATE);
545 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
546 BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
547 "BPF_MAP_CREATE", 0);
548 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
549 BTF_F_COMPACT | BTF_F_ZERO,
550 "(enum bpf_cmd)BPF_MAP_CREATE",
551 BPF_MAP_CREATE);
552 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
553 BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
554 "BPF_MAP_CREATE", BPF_MAP_CREATE);
555 TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT, 2000);
556 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
557 BTF_F_COMPACT | BTF_F_NONAME,
558 "2000", 2000);
559 TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, 0,
560 "(enum bpf_cmd)2000", 2000);
561
562 TEST_BTF_DUMP_DATA_OVER(btf, d, "enum", str, enum bpf_cmd,
563 sizeof(enum bpf_cmd) - 1, "", BPF_MAP_CREATE);
564 }
565
test_btf_dump_struct_data(struct btf * btf,struct btf_dump * d,char * str)566 static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
567 char *str)
568 {
569 DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
570 char zero_data[512] = { };
571 char type_data[512];
572 void *fops = type_data;
573 void *skb = type_data;
574 size_t type_sz;
575 __s32 type_id;
576 char *cmpstr;
577 int ret;
578
579 memset(type_data, 255, sizeof(type_data));
580
581 /* simple struct */
582 TEST_BTF_DUMP_DATA_C(btf, d, "struct", str, struct btf_enum, BTF_F_COMPACT,
583 {.name_off = (__u32)3,.val = (__s32)-1,});
584 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
585 BTF_F_COMPACT | BTF_F_NONAME,
586 "{3,-1,}",
587 { .name_off = 3, .val = -1,});
588 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, 0,
589 "(struct btf_enum){\n"
590 " .name_off = (__u32)3,\n"
591 " .val = (__s32)-1,\n"
592 "}",
593 { .name_off = 3, .val = -1,});
594 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
595 BTF_F_COMPACT | BTF_F_NONAME,
596 "{-1,}",
597 { .name_off = 0, .val = -1,});
598 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
599 BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
600 "{0,-1,}",
601 { .name_off = 0, .val = -1,});
602 /* empty struct should be printed */
603 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, BTF_F_COMPACT,
604 "(struct btf_enum){}",
605 { .name_off = 0, .val = 0,});
606 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
607 BTF_F_COMPACT | BTF_F_NONAME,
608 "{}",
609 { .name_off = 0, .val = 0,});
610 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, 0,
611 "(struct btf_enum){\n"
612 "}",
613 { .name_off = 0, .val = 0,});
614 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
615 BTF_F_COMPACT | BTF_F_ZERO,
616 "(struct btf_enum){.name_off = (__u32)0,.val = (__s32)0,}",
617 { .name_off = 0, .val = 0,});
618 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
619 BTF_F_ZERO,
620 "(struct btf_enum){\n"
621 " .name_off = (__u32)0,\n"
622 " .val = (__s32)0,\n"
623 "}",
624 { .name_off = 0, .val = 0,});
625
626 /* struct with pointers */
627 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, BTF_F_COMPACT,
628 "(struct list_head){.next = (struct list_head *)0x1,}",
629 { .next = (struct list_head *)1 });
630 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, 0,
631 "(struct list_head){\n"
632 " .next = (struct list_head *)0x1,\n"
633 "}",
634 { .next = (struct list_head *)1 });
635 /* NULL pointer should not be displayed */
636 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, BTF_F_COMPACT,
637 "(struct list_head){}",
638 { .next = (struct list_head *)0 });
639 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, 0,
640 "(struct list_head){\n"
641 "}",
642 { .next = (struct list_head *)0 });
643
644 /* struct with function pointers */
645 type_id = btf__find_by_name(btf, "file_operations");
646 if (ASSERT_GT(type_id, 0, "find type id")) {
647 type_sz = btf__resolve_size(btf, type_id);
648 str[0] = '\0';
649
650 ret = btf_dump__dump_type_data(d, type_id, fops, type_sz, &opts);
651 ASSERT_EQ(ret, type_sz,
652 "unexpected return value dumping file_operations");
653 cmpstr =
654 "(struct file_operations){\n"
655 " .owner = (struct module *)0xffffffffffffffff,\n"
656 " .fop_flags = (fop_flags_t)4294967295,";
657
658 ASSERT_STRNEQ(str, cmpstr, strlen(cmpstr), "file_operations");
659 }
660
661 /* struct with char array */
662 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
663 "(struct bpf_prog_info){.name = (char[16])['f','o','o',],}",
664 { .name = "foo",});
665 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info,
666 BTF_F_COMPACT | BTF_F_NONAME,
667 "{['f','o','o',],}",
668 {.name = "foo",});
669 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, 0,
670 "(struct bpf_prog_info){\n"
671 " .name = (char[16])[\n"
672 " 'f',\n"
673 " 'o',\n"
674 " 'o',\n"
675 " ],\n"
676 "}",
677 {.name = "foo",});
678 /* leading null char means do not display string */
679 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
680 "(struct bpf_prog_info){}",
681 {.name = {'\0', 'f', 'o', 'o'}});
682 /* handle non-printable characters */
683 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
684 "(struct bpf_prog_info){.name = (char[16])[1,2,3,],}",
685 { .name = {1, 2, 3, 0}});
686
687 /* struct with non-char array */
688 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, BTF_F_COMPACT,
689 "(struct __sk_buff){.cb = (__u32[5])[1,2,3,4,5,],}",
690 { .cb = {1, 2, 3, 4, 5,},});
691 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff,
692 BTF_F_COMPACT | BTF_F_NONAME,
693 "{[1,2,3,4,5,],}",
694 { .cb = { 1, 2, 3, 4, 5},});
695 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, 0,
696 "(struct __sk_buff){\n"
697 " .cb = (__u32[5])[\n"
698 " 1,\n"
699 " 2,\n"
700 " 3,\n"
701 " 4,\n"
702 " 5,\n"
703 " ],\n"
704 "}",
705 { .cb = { 1, 2, 3, 4, 5},});
706 /* For non-char, arrays, show non-zero values only */
707 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, BTF_F_COMPACT,
708 "(struct __sk_buff){.cb = (__u32[5])[0,0,1,0,0,],}",
709 { .cb = { 0, 0, 1, 0, 0},});
710 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, 0,
711 "(struct __sk_buff){\n"
712 " .cb = (__u32[5])[\n"
713 " 0,\n"
714 " 0,\n"
715 " 1,\n"
716 " 0,\n"
717 " 0,\n"
718 " ],\n"
719 "}",
720 { .cb = { 0, 0, 1, 0, 0},});
721
722 /* struct with bitfields */
723 TEST_BTF_DUMP_DATA_C(btf, d, "struct", str, struct bpf_insn, BTF_F_COMPACT,
724 {.code = (__u8)1,.dst_reg = (__u8)0x2,.src_reg = (__u8)0x3,.off = (__s16)4,.imm = (__s32)5,});
725 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn,
726 BTF_F_COMPACT | BTF_F_NONAME,
727 "{1,0x2,0x3,4,5,}",
728 { .code = 1, .dst_reg = 0x2, .src_reg = 0x3, .off = 4,
729 .imm = 5,});
730 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn, 0,
731 "(struct bpf_insn){\n"
732 " .code = (__u8)1,\n"
733 " .dst_reg = (__u8)0x2,\n"
734 " .src_reg = (__u8)0x3,\n"
735 " .off = (__s16)4,\n"
736 " .imm = (__s32)5,\n"
737 "}",
738 {.code = 1, .dst_reg = 2, .src_reg = 3, .off = 4, .imm = 5});
739
740 /* zeroed bitfields should not be displayed */
741 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn, BTF_F_COMPACT,
742 "(struct bpf_insn){.dst_reg = (__u8)0x1,}",
743 { .code = 0, .dst_reg = 1});
744
745 /* struct with enum bitfield */
746 type_id = btf__find_by_name(btf, "fs_context");
747 if (ASSERT_GT(type_id, 0, "find fs_context")) {
748 type_sz = btf__resolve_size(btf, type_id);
749 str[0] = '\0';
750
751 opts.emit_zeroes = true;
752 ret = btf_dump__dump_type_data(d, type_id, zero_data, type_sz, &opts);
753 ASSERT_EQ(ret, type_sz,
754 "unexpected return value dumping fs_context");
755
756 ASSERT_NEQ(strstr(str, "FS_CONTEXT_FOR_MOUNT"), NULL,
757 "bitfield value not present");
758 }
759
760 /* struct with nested anon union */
761 TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_sock_ops, BTF_F_COMPACT,
762 "(struct bpf_sock_ops){.op = (__u32)1,(union){.args = (__u32[4])[1,2,3,4,],.reply = (__u32)1,.replylong = (__u32[4])[1,2,3,4,],},}",
763 { .op = 1, .args = { 1, 2, 3, 4}});
764
765 /* union with nested struct */
766 TEST_BTF_DUMP_DATA(btf, d, "union", str, union bpf_iter_link_info, BTF_F_COMPACT,
767 "(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},.cgroup = (struct){.order = (enum bpf_cgroup_iter_order)BPF_CGROUP_ITER_SELF_ONLY,.cgroup_fd = (__u32)1,},.task = (struct){.tid = (__u32)1,.pid = (__u32)1,},}",
768 { .cgroup = { .order = 1, .cgroup_fd = 1, }});
769
770 /* struct skb with nested structs/unions; because type output is so
771 * complex, we don't do a string comparison, just verify we return
772 * the type size as the amount of data displayed.
773 */
774 type_id = btf__find_by_name(btf, "sk_buff");
775 if (ASSERT_GT(type_id, 0, "find struct sk_buff")) {
776 type_sz = btf__resolve_size(btf, type_id);
777 str[0] = '\0';
778
779 ret = btf_dump__dump_type_data(d, type_id, skb, type_sz, &opts);
780 ASSERT_EQ(ret, type_sz,
781 "unexpected return value dumping sk_buff");
782 }
783
784 /* overflow bpf_sock_ops struct with final element nonzero/zero.
785 * Regardless of the value of the final field, we don't have all the
786 * data we need to display it, so we should trigger an overflow.
787 * In other words overflow checking should trump "is field zero?"
788 * checks because if we've overflowed, it shouldn't matter what the
789 * field is - we can't trust its value so shouldn't display it.
790 */
791 TEST_BTF_DUMP_DATA_OVER(btf, d, "struct", str, struct bpf_sock_ops,
792 sizeof(struct bpf_sock_ops) - 1,
793 "(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
794 { .op = 1, .skb_hwtstamp = 2});
795 TEST_BTF_DUMP_DATA_OVER(btf, d, "struct", str, struct bpf_sock_ops,
796 sizeof(struct bpf_sock_ops) - 1,
797 "(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
798 { .op = 1, .skb_hwtstamp = 0});
799 }
800
test_btf_dump_var_data(struct btf * btf,struct btf_dump * d,char * str)801 static void test_btf_dump_var_data(struct btf *btf, struct btf_dump *d,
802 char *str)
803 {
804 #if 0
805 TEST_BTF_DUMP_VAR(btf, d, NULL, str, "cpu_number", int, BTF_F_COMPACT,
806 "int cpu_number = (int)100", 100);
807 #endif
808 TEST_BTF_DUMP_VAR(btf, d, NULL, str, "bpf_cgrp_storage_busy", int, BTF_F_COMPACT,
809 "static int bpf_cgrp_storage_busy = (int)2", 2);
810 }
811
test_btf_datasec(struct btf * btf,struct btf_dump * d,char * str,const char * name,const char * expected_val,void * data,size_t data_sz)812 static void test_btf_datasec(struct btf *btf, struct btf_dump *d, char *str,
813 const char *name, const char *expected_val,
814 void *data, size_t data_sz)
815 {
816 DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
817 int ret = 0, cmp;
818 size_t secsize;
819 __s32 type_id;
820
821 opts.compact = true;
822
823 type_id = btf__find_by_name(btf, name);
824 if (!ASSERT_GT(type_id, 0, "find type id"))
825 return;
826
827 secsize = btf__resolve_size(btf, type_id);
828 ASSERT_EQ(secsize, 0, "verify section size");
829
830 str[0] = '\0';
831 ret = btf_dump__dump_type_data(d, type_id, data, data_sz, &opts);
832 ASSERT_EQ(ret, 0, "unexpected return value");
833
834 cmp = strcmp(str, expected_val);
835 ASSERT_EQ(cmp, 0, "ensure expected/actual match");
836 }
837
test_btf_dump_datasec_data(char * str)838 static void test_btf_dump_datasec_data(char *str)
839 {
840 struct btf *btf;
841 char license[4] = "GPL";
842 struct btf_dump *d;
843
844 btf = btf__parse("xdping_kern.bpf.o", NULL);
845 if (!ASSERT_OK_PTR(btf, "xdping_kern.bpf.o BTF not found"))
846 return;
847
848 d = btf_dump__new(btf, btf_dump_snprintf, str, NULL);
849 if (!ASSERT_OK_PTR(d, "could not create BTF dump"))
850 goto out;
851
852 test_btf_datasec(btf, d, str, "license",
853 "SEC(\"license\") char[4] _license = (char[4])['G','P','L',];",
854 license, sizeof(license));
855 out:
856 btf_dump__free(d);
857 btf__free(btf);
858 }
859
test_btf_dump()860 void test_btf_dump() {
861 char str[STRSIZE];
862 struct btf_dump *d;
863 struct btf *btf;
864 int i;
865
866 for (i = 0; i < ARRAY_SIZE(btf_dump_test_cases); i++) {
867 struct btf_dump_test_case *t = &btf_dump_test_cases[i];
868
869 if (!test__start_subtest(t->name))
870 continue;
871
872 test_btf_dump_case(i, &btf_dump_test_cases[i]);
873 }
874 if (test__start_subtest("btf_dump: incremental"))
875 test_btf_dump_incremental();
876
877 btf = libbpf_find_kernel_btf();
878 if (!ASSERT_OK_PTR(btf, "no kernel BTF found"))
879 return;
880
881 d = btf_dump__new(btf, btf_dump_snprintf, str, NULL);
882 if (!ASSERT_OK_PTR(d, "could not create BTF dump"))
883 return;
884
885 /* Verify type display for various types. */
886 if (test__start_subtest("btf_dump: int_data"))
887 test_btf_dump_int_data(btf, d, str);
888 if (test__start_subtest("btf_dump: float_data"))
889 test_btf_dump_float_data(btf, d, str);
890 if (test__start_subtest("btf_dump: char_data"))
891 test_btf_dump_char_data(btf, d, str);
892 if (test__start_subtest("btf_dump: typedef_data"))
893 test_btf_dump_typedef_data(btf, d, str);
894 if (test__start_subtest("btf_dump: enum_data"))
895 test_btf_dump_enum_data(btf, d, str);
896 if (test__start_subtest("btf_dump: struct_data"))
897 test_btf_dump_struct_data(btf, d, str);
898 if (test__start_subtest("btf_dump: var_data"))
899 test_btf_dump_var_data(btf, d, str);
900 btf_dump__free(d);
901 btf__free(btf);
902
903 if (test__start_subtest("btf_dump: datasec_data"))
904 test_btf_dump_datasec_data(str);
905 }
906