| 1 | |
| 2 | #define __KERNEL__ |
| 3 | |
| 4 | #include <assert.h> |
| 5 | #include <sys/types.h> |
| 6 | #include <stdint.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | |
| 10 | #include <linux/compiler.h> |
| 11 | |
| 12 | #define min(a,b) (((a)<(b))?a:b) |
| 13 | #define max(a,b) (((a)>(b))?a:b) |
| 14 | #define BUG_ON(a) assert(!(a)) |
| 15 | |
| 16 | // Useful outside __KERNEL__. Not used here because inline is already redefined. |
| 17 | #define force_inline inline __attribute__((always_inline)) |
| 18 | |
| 19 | /* Calculate the offset needed to align the type */ |
| 20 | static inline unsigned int ltt_align(size_t align_drift, |
| 21 | size_t size_of_type) |
| 22 | { |
| 23 | size_t alignment = min(sizeof(void*), size_of_type); |
| 24 | |
| 25 | return ((alignment - align_drift) & (alignment-1)); |
| 26 | } |
| 27 | |
| 28 | |
| 29 | /* TEMPLATE */ |
| 30 | |
| 31 | enum lttng_tasklet_priority { |
| 32 | LTTNG_LOW, |
| 33 | LTTNG_HIGH, |
| 34 | }; |
| 35 | |
| 36 | enum lttng_irq_mode { |
| 37 | LTTNG_user, |
| 38 | LTTNG_kernel, |
| 39 | }; |
| 40 | |
| 41 | struct lttng_mystruct2 { |
| 42 | unsigned int irq_id; |
| 43 | enum lttng_irq_mode mode; |
| 44 | //struct lttng_mystruct teststr1; |
| 45 | }; |
| 46 | |
| 47 | |
| 48 | static inline size_t lttng_get_size_mystruct2( |
| 49 | struct lttng_mystruct2 * obj) |
| 50 | { |
| 51 | size_t size=0, locsize; |
| 52 | |
| 53 | locsize = sizeof(unsigned int); |
| 54 | size += ltt_align(size, locsize) + locsize; |
| 55 | |
| 56 | locsize = sizeof(enum lttng_irq_mode); |
| 57 | size += ltt_align(size, locsize) + locsize; |
| 58 | |
| 59 | BUG_ON(sizeof(struct lttng_mystruct2) != size); |
| 60 | |
| 61 | return sizeof(struct lttng_mystruct2); |
| 62 | } |
| 63 | |
| 64 | static inline size_t lttng_get_alignment_mystruct2( |
| 65 | struct lttng_mystruct2 *obj) |
| 66 | { |
| 67 | size_t align=0, localign; |
| 68 | |
| 69 | localign = sizeof(unsigned int); |
| 70 | align = max(align, localign); |
| 71 | |
| 72 | localign = sizeof(enum lttng_irq_mode); |
| 73 | align = max(align, localign); |
| 74 | |
| 75 | return align; |
| 76 | } |
| 77 | |
| 78 | static inline void lttng_write_mystruct2( |
| 79 | void **to_base, |
| 80 | size_t *to, |
| 81 | void **from, |
| 82 | size_t *len, |
| 83 | struct lttng_mystruct2 *obj) |
| 84 | { |
| 85 | size_t align, size; |
| 86 | |
| 87 | align = lttng_get_alignment_mystruct2(obj); |
| 88 | size = lttng_get_size_mystruct2(obj); |
| 89 | |
| 90 | if(*len == 0) { |
| 91 | *to += ltt_align(*to, align); /* align output */ |
| 92 | } else { |
| 93 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 94 | } |
| 95 | |
| 96 | *len += size; |
| 97 | } |
| 98 | |
| 99 | |
| 100 | |
| 101 | #define LTTNG_ARRAY_SIZE_mystruct_myarray 10 |
| 102 | typedef uint64_t lttng_array_mystruct_myarray[LTTNG_ARRAY_SIZE_mystruct_myarray]; |
| 103 | |
| 104 | static inline size_t lttng_get_size_array_mystruct_myarray( |
| 105 | lttng_array_mystruct_myarray obj) |
| 106 | { |
| 107 | size_t size=0, locsize; |
| 108 | |
| 109 | locsize = sizeof(uint64_t); |
| 110 | /* ltt_align == 0 always*/ |
| 111 | //size += ltt_align(size, locsize) + (LTTNG_ARRAY_SIZE_mystruct_myarray * locsize); |
| 112 | BUG_ON(ltt_align(size, locsize) != 0); |
| 113 | size += LTTNG_ARRAY_SIZE_mystruct_myarray * locsize; |
| 114 | |
| 115 | BUG_ON(sizeof(lttng_array_mystruct_myarray) != size); |
| 116 | |
| 117 | return sizeof(lttng_array_mystruct_myarray); |
| 118 | } |
| 119 | |
| 120 | static inline size_t lttng_get_alignment_array_mystruct_myarray( |
| 121 | lttng_array_mystruct_myarray obj) |
| 122 | { |
| 123 | size_t align=0, localign; |
| 124 | |
| 125 | localign = sizeof(uint64_t); |
| 126 | align = max(align, localign); |
| 127 | |
| 128 | return align; |
| 129 | } |
| 130 | |
| 131 | |
| 132 | static inline void lttng_write_array_mystruct_myarray( |
| 133 | void **to_base, |
| 134 | size_t *to, |
| 135 | void **from, |
| 136 | size_t *len, |
| 137 | lttng_array_mystruct_myarray obj) |
| 138 | { |
| 139 | size_t align, size; |
| 140 | |
| 141 | align = lttng_get_alignment_array_mystruct_myarray(obj); |
| 142 | size = lttng_get_size_array_mystruct_myarray(obj); |
| 143 | |
| 144 | if(*len == 0) { |
| 145 | *to += ltt_align(*to, align); /* align output */ |
| 146 | } else { |
| 147 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 148 | } |
| 149 | |
| 150 | *len += size; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | typedef struct lttng_sequence_mystruct_mysequence lttng_sequence_mystruct_mysequence; |
| 155 | struct lttng_sequence_mystruct_mysequence { |
| 156 | unsigned int len; |
| 157 | double *array; |
| 158 | }; |
| 159 | |
| 160 | |
| 161 | static inline size_t lttng_get_size_sequence_mystruct_mysequence( |
| 162 | lttng_sequence_mystruct_mysequence *obj) |
| 163 | { |
| 164 | size_t size=0, locsize; |
| 165 | |
| 166 | locsize = sizeof(unsigned int); |
| 167 | size += ltt_align(size, locsize) + locsize; |
| 168 | |
| 169 | locsize = sizeof(double); |
| 170 | size += ltt_align(size, locsize) + (obj->len * locsize); |
| 171 | |
| 172 | /* Realign on arch size */ |
| 173 | locsize = sizeof(void *); |
| 174 | size += ltt_align(size, locsize); |
| 175 | |
| 176 | return size; |
| 177 | } |
| 178 | |
| 179 | static inline size_t lttng_get_alignment_sequence_mystruct_mysequence( |
| 180 | lttng_sequence_mystruct_mysequence *obj) |
| 181 | { |
| 182 | size_t align=0, localign; |
| 183 | |
| 184 | localign = sizeof(unsigned int); |
| 185 | align = max(align, localign); |
| 186 | |
| 187 | localign = sizeof(double); |
| 188 | align = max(align, localign); |
| 189 | |
| 190 | return align; |
| 191 | } |
| 192 | |
| 193 | |
| 194 | static inline void lttng_write_sequence_mystruct_mysequence( |
| 195 | void **to_base, |
| 196 | size_t *to, |
| 197 | void **from, |
| 198 | size_t *len, |
| 199 | lttng_sequence_mystruct_mysequence *obj) |
| 200 | { |
| 201 | size_t align; |
| 202 | void *varfrom; |
| 203 | size_t varlen=0; |
| 204 | |
| 205 | /* Flush pending memcpy */ |
| 206 | if(*len != 0) { |
| 207 | memcpy(*to_base+*to, *from, *len); |
| 208 | *to += *len; |
| 209 | *len = 0; |
| 210 | } |
| 211 | |
| 212 | align = lttng_get_alignment_sequence_mystruct_mysequence(obj); |
| 213 | //no need size = lttng_get_size_sequence_mystruct_mysequence(obj); |
| 214 | |
| 215 | /* Align output */ |
| 216 | *to += ltt_align(*to, align); /* *len = 0 in this function */ |
| 217 | |
| 218 | /* Copy members */ |
| 219 | *to += ltt_align(*to, sizeof(unsigned int)); |
| 220 | varfrom = &obj->len; |
| 221 | varlen += sizeof(unsigned int); |
| 222 | memcpy(*to_base+*to, varfrom, varlen); |
| 223 | *to += varlen; |
| 224 | varlen = 0; |
| 225 | |
| 226 | *to += ltt_align(*to, sizeof(double)); |
| 227 | varfrom = obj->array; |
| 228 | varlen += obj->len * sizeof(double); |
| 229 | memcpy(*to_base+*to, varfrom, varlen); |
| 230 | *to += varlen; |
| 231 | varlen = 0; |
| 232 | |
| 233 | /* Realign the *to_base on arch size, set *to to 0 */ |
| 234 | *to = ltt_align(*to, sizeof(void *)); |
| 235 | *to_base = *to_base+*to; |
| 236 | *to = 0; |
| 237 | |
| 238 | /* Put source *from just after the C sequence */ |
| 239 | *from = obj+1; |
| 240 | } |
| 241 | |
| 242 | |
| 243 | |
| 244 | union lttng_mystruct_myunion { |
| 245 | double myfloat; |
| 246 | unsigned long myulong; |
| 247 | }; |
| 248 | |
| 249 | |
| 250 | static inline size_t lttng_get_size_mystruct_myunion( |
| 251 | union lttng_mystruct_myunion *obj) |
| 252 | { |
| 253 | size_t size=0, locsize; |
| 254 | |
| 255 | locsize = sizeof(double); |
| 256 | size = max(size, locsize); |
| 257 | |
| 258 | locsize = sizeof(unsigned long); |
| 259 | size = max(size, locsize); |
| 260 | |
| 261 | BUG_ON(size != sizeof(union lttng_mystruct_myunion)); |
| 262 | |
| 263 | return sizeof(union lttng_mystruct_myunion); |
| 264 | } |
| 265 | |
| 266 | |
| 267 | static inline size_t lttng_get_alignment_mystruct_myunion( |
| 268 | union lttng_mystruct_myunion *obj) |
| 269 | { |
| 270 | size_t align=0, localign; |
| 271 | |
| 272 | localign = sizeof(double); |
| 273 | align = max(align, localign); |
| 274 | |
| 275 | localign = sizeof(unsigned long); |
| 276 | align = max(align, localign); |
| 277 | |
| 278 | return align; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | static inline void lttng_write_mystruct_myunion( |
| 283 | void **to_base, |
| 284 | size_t *to, |
| 285 | void **from, |
| 286 | size_t *len, |
| 287 | union lttng_mystruct_myunion *obj) |
| 288 | { |
| 289 | size_t align, size; |
| 290 | |
| 291 | align = lttng_get_alignment_mystruct_myunion(obj); |
| 292 | size = lttng_get_size_mystruct_myunion(obj); |
| 293 | |
| 294 | if(*len == 0) { |
| 295 | *to += ltt_align(*to, align); /* align output */ |
| 296 | } else { |
| 297 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 298 | } |
| 299 | |
| 300 | *len += size; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | struct lttng_mystruct { |
| 305 | unsigned int irq_id; |
| 306 | enum lttng_irq_mode mode; |
| 307 | struct lttng_mystruct2 teststr; |
| 308 | lttng_array_mystruct_myarray myarray; |
| 309 | lttng_sequence_mystruct_mysequence mysequence; |
| 310 | union lttng_mystruct_myunion myunion; |
| 311 | }; |
| 312 | |
| 313 | static inline size_t lttng_get_size_mystruct( |
| 314 | struct lttng_mystruct *obj) |
| 315 | { |
| 316 | size_t size=0, locsize, localign; |
| 317 | |
| 318 | locsize = sizeof(unsigned int); |
| 319 | size += ltt_align(size, locsize) + locsize; |
| 320 | |
| 321 | locsize = sizeof(enum lttng_irq_mode); |
| 322 | size += ltt_align(size, locsize) + locsize; |
| 323 | |
| 324 | localign = lttng_get_alignment_mystruct2(&obj->teststr); |
| 325 | locsize = lttng_get_size_mystruct2(&obj->teststr); |
| 326 | size += ltt_align(size, localign) + locsize; |
| 327 | |
| 328 | localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray); |
| 329 | locsize = lttng_get_size_array_mystruct_myarray(obj->myarray); |
| 330 | size += ltt_align(size, localign) + locsize; |
| 331 | |
| 332 | localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence); |
| 333 | locsize = lttng_get_size_sequence_mystruct_mysequence(&obj->mysequence); |
| 334 | size += ltt_align(size, localign) + locsize; |
| 335 | |
| 336 | localign = lttng_get_alignment_mystruct_myunion(&obj->myunion); |
| 337 | locsize = lttng_get_size_mystruct_myunion(&obj->myunion); |
| 338 | size += ltt_align(size, localign) + locsize; |
| 339 | |
| 340 | return size; |
| 341 | } |
| 342 | |
| 343 | |
| 344 | static inline size_t lttng_get_alignment_mystruct( |
| 345 | struct lttng_mystruct *obj) |
| 346 | { |
| 347 | size_t align=0, localign; |
| 348 | |
| 349 | localign = sizeof(unsigned int); |
| 350 | align = max(align, localign); |
| 351 | |
| 352 | localign = sizeof(enum lttng_irq_mode); |
| 353 | align = max(align, localign); |
| 354 | |
| 355 | localign = lttng_get_alignment_mystruct2(&obj->teststr); |
| 356 | align = max(align, localign); |
| 357 | |
| 358 | localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray); |
| 359 | align = max(align, localign); |
| 360 | |
| 361 | localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence); |
| 362 | align = max(align, localign); |
| 363 | |
| 364 | localign = lttng_get_alignment_mystruct_myunion(&obj->myunion); |
| 365 | align = max(align, localign); |
| 366 | |
| 367 | return align; |
| 368 | } |
| 369 | |
| 370 | static inline void lttng_write_mystruct( |
| 371 | void **to_base, |
| 372 | size_t *to, |
| 373 | void **from, |
| 374 | size_t *len, |
| 375 | struct lttng_mystruct *obj) |
| 376 | { |
| 377 | size_t align, size; |
| 378 | |
| 379 | align = lttng_get_alignment_mystruct(obj); |
| 380 | // no need : contains variable size fields. |
| 381 | // locsize = lttng_get_size_mystruct(obj); |
| 382 | |
| 383 | if(*len == 0) { |
| 384 | *to += ltt_align(*to, align); /* align output */ |
| 385 | } else { |
| 386 | *len += ltt_align(*to+*len, align); /* C alignment, ok to do a memcpy of it */ |
| 387 | } |
| 388 | |
| 389 | /* Contains variable sized fields : must explode the structure */ |
| 390 | |
| 391 | size = sizeof(unsigned int); |
| 392 | size += ltt_align(*to+*len, size) + size; |
| 393 | *len += size; |
| 394 | |
| 395 | size = sizeof(enum lttng_irq_mode); |
| 396 | size += ltt_align(*to+*len, size) + size; |
| 397 | *len += size; |
| 398 | |
| 399 | lttng_write_mystruct2(to_base, to, from, len, &obj->teststr); |
| 400 | |
| 401 | lttng_write_array_mystruct_myarray(to_base, to, from, len, obj->myarray); |
| 402 | |
| 403 | /* Variable length field */ |
| 404 | lttng_write_sequence_mystruct_mysequence(to_base, to, from, len, &obj->mysequence); |
| 405 | //*to = 0; /* Force the compiler to know it's 0 */ |
| 406 | /* After this previous write, we are sure that *to is 0, and *to_base is |
| 407 | * aligned on the architecture size : to rest of alignment will be calculated |
| 408 | * statically. */ |
| 409 | |
| 410 | lttng_write_mystruct_myunion(to_base, to, from, len, &obj->myunion); |
| 411 | |
| 412 | /* Don't forget to flush last write..... */ |
| 413 | } |
| 414 | |
| 415 | |
| 416 | |
| 417 | |
| 418 | |
| 419 | |
| 420 | //void main() |
| 421 | void test() |
| 422 | { |
| 423 | struct lttng_mystruct test; |
| 424 | test.mysequence.len = 20; |
| 425 | test.mysequence.array = malloc(20); |
| 426 | |
| 427 | size_t size = lttng_get_size_mystruct(&test); |
| 428 | size_t align = lttng_get_alignment_mystruct(&test); |
| 429 | |
| 430 | void *buf = malloc(align + size); |
| 431 | void *to_base = buf; /* the buffer is allocated on arch_size alignment */ |
| 432 | size_t to = 0; |
| 433 | void *from = &test; |
| 434 | size_t len = 0; |
| 435 | |
| 436 | lttng_write_mystruct(&to_base, &to, &from, &len, &test); |
| 437 | /* Final flush */ |
| 438 | /* Flush pending memcpy */ |
| 439 | if(len != 0) { |
| 440 | memcpy(to_base+to, from, len); |
| 441 | to += len; |
| 442 | from += len; |
| 443 | len = 0; |
| 444 | } |
| 445 | |
| 446 | free(test.mysequence.array); |
| 447 | free(buf); |
| 448 | } |