| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * sorttable.c: Sort the kernel's table |
| 4 | * |
| 5 | * Added ORC unwind tables sort support and other updates: |
| 6 | * Copyright (C) 1999-2019 Alibaba Group Holding Limited. by: |
| 7 | * Shile Zhang <shile.zhang@linux.alibaba.com> |
| 8 | * |
| 9 | * Copyright 2011 - 2012 Cavium, Inc. |
| 10 | * |
| 11 | * Based on code taken from recortmcount.c which is: |
| 12 | * |
| 13 | * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. |
| 14 | * |
| 15 | * Restructured to fit Linux format, as well as other updates: |
| 16 | * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc. |
| 17 | */ |
| 18 | |
| 19 | /* |
| 20 | * Strategy: alter the vmlinux file in-place. |
| 21 | */ |
| 22 | |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/mman.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <getopt.h> |
| 27 | #include <elf.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <stdbool.h> |
| 32 | #include <string.h> |
| 33 | #include <unistd.h> |
| 34 | #include <errno.h> |
| 35 | #include <pthread.h> |
| 36 | |
| 37 | #include <tools/be_byteshift.h> |
| 38 | #include <tools/le_byteshift.h> |
| 39 | |
| 40 | #ifndef EM_ARCOMPACT |
| 41 | #define EM_ARCOMPACT 93 |
| 42 | #endif |
| 43 | |
| 44 | #ifndef EM_XTENSA |
| 45 | #define EM_XTENSA 94 |
| 46 | #endif |
| 47 | |
| 48 | #ifndef EM_AARCH64 |
| 49 | #define EM_AARCH64 183 |
| 50 | #endif |
| 51 | |
| 52 | #ifndef EM_MICROBLAZE |
| 53 | #define EM_MICROBLAZE 189 |
| 54 | #endif |
| 55 | |
| 56 | #ifndef EM_ARCV2 |
| 57 | #define EM_ARCV2 195 |
| 58 | #endif |
| 59 | |
| 60 | #ifndef EM_RISCV |
| 61 | #define EM_RISCV 243 |
| 62 | #endif |
| 63 | |
| 64 | #ifndef EM_LOONGARCH |
| 65 | #define EM_LOONGARCH 258 |
| 66 | #endif |
| 67 | |
| 68 | typedef union { |
| 69 | Elf32_Ehdr e32; |
| 70 | Elf64_Ehdr e64; |
| 71 | } Elf_Ehdr; |
| 72 | |
| 73 | typedef union { |
| 74 | Elf32_Shdr e32; |
| 75 | Elf64_Shdr e64; |
| 76 | } Elf_Shdr; |
| 77 | |
| 78 | typedef union { |
| 79 | Elf32_Sym e32; |
| 80 | Elf64_Sym e64; |
| 81 | } Elf_Sym; |
| 82 | |
| 83 | typedef union { |
| 84 | Elf32_Rela e32; |
| 85 | Elf64_Rela e64; |
| 86 | } Elf_Rela; |
| 87 | |
| 88 | static uint32_t (*r)(const uint32_t *); |
| 89 | static uint16_t (*r2)(const uint16_t *); |
| 90 | static uint64_t (*r8)(const uint64_t *); |
| 91 | static void (*w)(uint32_t, uint32_t *); |
| 92 | static void (*w8)(uint64_t, uint64_t *); |
| 93 | typedef void (*table_sort_t)(char *, int); |
| 94 | |
| 95 | static struct elf_funcs { |
| 96 | int (*compare_extable)(const void *a, const void *b); |
| 97 | uint64_t (*ehdr_shoff)(Elf_Ehdr *ehdr); |
| 98 | uint16_t (*ehdr_shstrndx)(Elf_Ehdr *ehdr); |
| 99 | uint16_t (*ehdr_shentsize)(Elf_Ehdr *ehdr); |
| 100 | uint16_t (*ehdr_shnum)(Elf_Ehdr *ehdr); |
| 101 | uint64_t (*shdr_addr)(Elf_Shdr *shdr); |
| 102 | uint64_t (*shdr_offset)(Elf_Shdr *shdr); |
| 103 | uint64_t (*shdr_size)(Elf_Shdr *shdr); |
| 104 | uint64_t (*shdr_entsize)(Elf_Shdr *shdr); |
| 105 | uint32_t (*shdr_link)(Elf_Shdr *shdr); |
| 106 | uint32_t (*shdr_name)(Elf_Shdr *shdr); |
| 107 | uint32_t (*shdr_type)(Elf_Shdr *shdr); |
| 108 | uint8_t (*sym_type)(Elf_Sym *sym); |
| 109 | uint32_t (*sym_name)(Elf_Sym *sym); |
| 110 | uint64_t (*sym_value)(Elf_Sym *sym); |
| 111 | uint16_t (*sym_shndx)(Elf_Sym *sym); |
| 112 | uint64_t (*rela_offset)(Elf_Rela *rela); |
| 113 | uint64_t (*rela_info)(Elf_Rela *rela); |
| 114 | uint64_t (*rela_addend)(Elf_Rela *rela); |
| 115 | void (*rela_write_addend)(Elf_Rela *rela, uint64_t val); |
| 116 | } e; |
| 117 | |
| 118 | static uint64_t ehdr64_shoff(Elf_Ehdr *ehdr) |
| 119 | { |
| 120 | return r8(&ehdr->e64.e_shoff); |
| 121 | } |
| 122 | |
| 123 | static uint64_t ehdr32_shoff(Elf_Ehdr *ehdr) |
| 124 | { |
| 125 | return r(&ehdr->e32.e_shoff); |
| 126 | } |
| 127 | |
| 128 | static uint64_t ehdr_shoff(Elf_Ehdr *ehdr) |
| 129 | { |
| 130 | return e.ehdr_shoff(ehdr); |
| 131 | } |
| 132 | |
| 133 | #define EHDR_HALF(fn_name) \ |
| 134 | static uint16_t ehdr64_##fn_name(Elf_Ehdr *ehdr) \ |
| 135 | { \ |
| 136 | return r2(&ehdr->e64.e_##fn_name); \ |
| 137 | } \ |
| 138 | \ |
| 139 | static uint16_t ehdr32_##fn_name(Elf_Ehdr *ehdr) \ |
| 140 | { \ |
| 141 | return r2(&ehdr->e32.e_##fn_name); \ |
| 142 | } \ |
| 143 | \ |
| 144 | static uint16_t ehdr_##fn_name(Elf_Ehdr *ehdr) \ |
| 145 | { \ |
| 146 | return e.ehdr_##fn_name(ehdr); \ |
| 147 | } |
| 148 | |
| 149 | EHDR_HALF(shentsize) |
| 150 | EHDR_HALF(shstrndx) |
| 151 | EHDR_HALF(shnum) |
| 152 | |
| 153 | #define SHDR_WORD(fn_name) \ |
| 154 | static uint32_t shdr64_##fn_name(Elf_Shdr *shdr) \ |
| 155 | { \ |
| 156 | return r(&shdr->e64.sh_##fn_name); \ |
| 157 | } \ |
| 158 | \ |
| 159 | static uint32_t shdr32_##fn_name(Elf_Shdr *shdr) \ |
| 160 | { \ |
| 161 | return r(&shdr->e32.sh_##fn_name); \ |
| 162 | } \ |
| 163 | \ |
| 164 | static uint32_t shdr_##fn_name(Elf_Shdr *shdr) \ |
| 165 | { \ |
| 166 | return e.shdr_##fn_name(shdr); \ |
| 167 | } |
| 168 | |
| 169 | #define SHDR_ADDR(fn_name) \ |
| 170 | static uint64_t shdr64_##fn_name(Elf_Shdr *shdr) \ |
| 171 | { \ |
| 172 | return r8(&shdr->e64.sh_##fn_name); \ |
| 173 | } \ |
| 174 | \ |
| 175 | static uint64_t shdr32_##fn_name(Elf_Shdr *shdr) \ |
| 176 | { \ |
| 177 | return r(&shdr->e32.sh_##fn_name); \ |
| 178 | } \ |
| 179 | \ |
| 180 | static uint64_t shdr_##fn_name(Elf_Shdr *shdr) \ |
| 181 | { \ |
| 182 | return e.shdr_##fn_name(shdr); \ |
| 183 | } |
| 184 | |
| 185 | #define SHDR_WORD(fn_name) \ |
| 186 | static uint32_t shdr64_##fn_name(Elf_Shdr *shdr) \ |
| 187 | { \ |
| 188 | return r(&shdr->e64.sh_##fn_name); \ |
| 189 | } \ |
| 190 | \ |
| 191 | static uint32_t shdr32_##fn_name(Elf_Shdr *shdr) \ |
| 192 | { \ |
| 193 | return r(&shdr->e32.sh_##fn_name); \ |
| 194 | } \ |
| 195 | static uint32_t shdr_##fn_name(Elf_Shdr *shdr) \ |
| 196 | { \ |
| 197 | return e.shdr_##fn_name(shdr); \ |
| 198 | } |
| 199 | |
| 200 | SHDR_ADDR(addr) |
| 201 | SHDR_ADDR(offset) |
| 202 | SHDR_ADDR(size) |
| 203 | SHDR_ADDR(entsize) |
| 204 | |
| 205 | SHDR_WORD(link) |
| 206 | SHDR_WORD(name) |
| 207 | SHDR_WORD(type) |
| 208 | |
| 209 | #define SYM_ADDR(fn_name) \ |
| 210 | static uint64_t sym64_##fn_name(Elf_Sym *sym) \ |
| 211 | { \ |
| 212 | return r8(&sym->e64.st_##fn_name); \ |
| 213 | } \ |
| 214 | \ |
| 215 | static uint64_t sym32_##fn_name(Elf_Sym *sym) \ |
| 216 | { \ |
| 217 | return r(&sym->e32.st_##fn_name); \ |
| 218 | } \ |
| 219 | \ |
| 220 | static uint64_t sym_##fn_name(Elf_Sym *sym) \ |
| 221 | { \ |
| 222 | return e.sym_##fn_name(sym); \ |
| 223 | } |
| 224 | |
| 225 | #define SYM_WORD(fn_name) \ |
| 226 | static uint32_t sym64_##fn_name(Elf_Sym *sym) \ |
| 227 | { \ |
| 228 | return r(&sym->e64.st_##fn_name); \ |
| 229 | } \ |
| 230 | \ |
| 231 | static uint32_t sym32_##fn_name(Elf_Sym *sym) \ |
| 232 | { \ |
| 233 | return r(&sym->e32.st_##fn_name); \ |
| 234 | } \ |
| 235 | \ |
| 236 | static uint32_t sym_##fn_name(Elf_Sym *sym) \ |
| 237 | { \ |
| 238 | return e.sym_##fn_name(sym); \ |
| 239 | } |
| 240 | |
| 241 | #define SYM_HALF(fn_name) \ |
| 242 | static uint16_t sym64_##fn_name(Elf_Sym *sym) \ |
| 243 | { \ |
| 244 | return r2(&sym->e64.st_##fn_name); \ |
| 245 | } \ |
| 246 | \ |
| 247 | static uint16_t sym32_##fn_name(Elf_Sym *sym) \ |
| 248 | { \ |
| 249 | return r2(&sym->e32.st_##fn_name); \ |
| 250 | } \ |
| 251 | \ |
| 252 | static uint16_t sym_##fn_name(Elf_Sym *sym) \ |
| 253 | { \ |
| 254 | return e.sym_##fn_name(sym); \ |
| 255 | } |
| 256 | |
| 257 | static uint8_t sym64_type(Elf_Sym *sym) |
| 258 | { |
| 259 | return ELF64_ST_TYPE(sym->e64.st_info); |
| 260 | } |
| 261 | |
| 262 | static uint8_t sym32_type(Elf_Sym *sym) |
| 263 | { |
| 264 | return ELF32_ST_TYPE(sym->e32.st_info); |
| 265 | } |
| 266 | |
| 267 | static uint8_t sym_type(Elf_Sym *sym) |
| 268 | { |
| 269 | return e.sym_type(sym); |
| 270 | } |
| 271 | |
| 272 | SYM_ADDR(value) |
| 273 | SYM_WORD(name) |
| 274 | SYM_HALF(shndx) |
| 275 | |
| 276 | #define __maybe_unused __attribute__((__unused__)) |
| 277 | |
| 278 | #define RELA_ADDR(fn_name) \ |
| 279 | static uint64_t rela64_##fn_name(Elf_Rela *rela) \ |
| 280 | { \ |
| 281 | return r8((uint64_t *)&rela->e64.r_##fn_name); \ |
| 282 | } \ |
| 283 | \ |
| 284 | static uint64_t rela32_##fn_name(Elf_Rela *rela) \ |
| 285 | { \ |
| 286 | return r((uint32_t *)&rela->e32.r_##fn_name); \ |
| 287 | } \ |
| 288 | \ |
| 289 | static uint64_t __maybe_unused rela_##fn_name(Elf_Rela *rela) \ |
| 290 | { \ |
| 291 | return e.rela_##fn_name(rela); \ |
| 292 | } |
| 293 | |
| 294 | RELA_ADDR(offset) |
| 295 | RELA_ADDR(info) |
| 296 | RELA_ADDR(addend) |
| 297 | |
| 298 | static void rela64_write_addend(Elf_Rela *rela, uint64_t val) |
| 299 | { |
| 300 | w8(val, (uint64_t *)&rela->e64.r_addend); |
| 301 | } |
| 302 | |
| 303 | static void rela32_write_addend(Elf_Rela *rela, uint64_t val) |
| 304 | { |
| 305 | w(val, (uint32_t *)&rela->e32.r_addend); |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Get the whole file as a programming convenience in order to avoid |
| 310 | * malloc+lseek+read+free of many pieces. If successful, then mmap |
| 311 | * avoids copying unused pieces; else just read the whole file. |
| 312 | * Open for both read and write. |
| 313 | */ |
| 314 | static void *mmap_file(char const *fname, size_t *size) |
| 315 | { |
| 316 | int fd; |
| 317 | struct stat sb; |
| 318 | void *addr = NULL; |
| 319 | |
| 320 | fd = open(fname, O_RDWR); |
| 321 | if (fd < 0) { |
| 322 | perror(fname); |
| 323 | return NULL; |
| 324 | } |
| 325 | if (fstat(fd, &sb) < 0) { |
| 326 | perror(fname); |
| 327 | goto out; |
| 328 | } |
| 329 | if (!S_ISREG(sb.st_mode)) { |
| 330 | fprintf(stderr, "not a regular file: %s\n", fname); |
| 331 | goto out; |
| 332 | } |
| 333 | |
| 334 | addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); |
| 335 | if (addr == MAP_FAILED) { |
| 336 | fprintf(stderr, "Could not mmap file: %s\n", fname); |
| 337 | goto out; |
| 338 | } |
| 339 | |
| 340 | *size = sb.st_size; |
| 341 | |
| 342 | out: |
| 343 | close(fd); |
| 344 | return addr; |
| 345 | } |
| 346 | |
| 347 | static uint32_t rbe(const uint32_t *x) |
| 348 | { |
| 349 | return get_unaligned_be32(x); |
| 350 | } |
| 351 | |
| 352 | static uint16_t r2be(const uint16_t *x) |
| 353 | { |
| 354 | return get_unaligned_be16(x); |
| 355 | } |
| 356 | |
| 357 | static uint64_t r8be(const uint64_t *x) |
| 358 | { |
| 359 | return get_unaligned_be64(x); |
| 360 | } |
| 361 | |
| 362 | static uint32_t rle(const uint32_t *x) |
| 363 | { |
| 364 | return get_unaligned_le32(x); |
| 365 | } |
| 366 | |
| 367 | static uint16_t r2le(const uint16_t *x) |
| 368 | { |
| 369 | return get_unaligned_le16(x); |
| 370 | } |
| 371 | |
| 372 | static uint64_t r8le(const uint64_t *x) |
| 373 | { |
| 374 | return get_unaligned_le64(x); |
| 375 | } |
| 376 | |
| 377 | static void wbe(uint32_t val, uint32_t *x) |
| 378 | { |
| 379 | put_unaligned_be32(val, x); |
| 380 | } |
| 381 | |
| 382 | static void wle(uint32_t val, uint32_t *x) |
| 383 | { |
| 384 | put_unaligned_le32(val, x); |
| 385 | } |
| 386 | |
| 387 | static void w8be(uint64_t val, uint64_t *x) |
| 388 | { |
| 389 | put_unaligned_be64(val, x); |
| 390 | } |
| 391 | |
| 392 | static void w8le(uint64_t val, uint64_t *x) |
| 393 | { |
| 394 | put_unaligned_le64(val, x); |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of |
| 399 | * the way to -256..-1, to avoid conflicting with real section |
| 400 | * indices. |
| 401 | */ |
| 402 | #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1)) |
| 403 | |
| 404 | static inline int is_shndx_special(unsigned int i) |
| 405 | { |
| 406 | return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE; |
| 407 | } |
| 408 | |
| 409 | /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ |
| 410 | static inline unsigned int get_secindex(unsigned int shndx, |
| 411 | unsigned int sym_offs, |
| 412 | const Elf32_Word *symtab_shndx_start) |
| 413 | { |
| 414 | if (is_shndx_special(shndx)) |
| 415 | return SPECIAL(shndx); |
| 416 | if (shndx != SHN_XINDEX) |
| 417 | return shndx; |
| 418 | return r(&symtab_shndx_start[sym_offs]); |
| 419 | } |
| 420 | |
| 421 | static int compare_extable_32(const void *a, const void *b) |
| 422 | { |
| 423 | Elf32_Addr av = r(a); |
| 424 | Elf32_Addr bv = r(b); |
| 425 | |
| 426 | if (av < bv) |
| 427 | return -1; |
| 428 | return av > bv; |
| 429 | } |
| 430 | |
| 431 | static int compare_extable_64(const void *a, const void *b) |
| 432 | { |
| 433 | Elf64_Addr av = r8(a); |
| 434 | Elf64_Addr bv = r8(b); |
| 435 | |
| 436 | if (av < bv) |
| 437 | return -1; |
| 438 | return av > bv; |
| 439 | } |
| 440 | |
| 441 | static int compare_extable(const void *a, const void *b) |
| 442 | { |
| 443 | return e.compare_extable(a, b); |
| 444 | } |
| 445 | |
| 446 | static inline void *get_index(void *start, int entsize, int index) |
| 447 | { |
| 448 | return start + (entsize * index); |
| 449 | } |
| 450 | |
| 451 | static int extable_ent_size; |
| 452 | static int long_size; |
| 453 | |
| 454 | #define ERRSTR_MAXSZ 256 |
| 455 | |
| 456 | #ifdef UNWINDER_ORC_ENABLED |
| 457 | /* ORC unwinder only support X86_64 */ |
| 458 | #include <asm/orc_types.h> |
| 459 | |
| 460 | static char g_err[ERRSTR_MAXSZ]; |
| 461 | static int *g_orc_ip_table; |
| 462 | static struct orc_entry *g_orc_table; |
| 463 | |
| 464 | static pthread_t orc_sort_thread; |
| 465 | |
| 466 | static inline unsigned long orc_ip(const int *ip) |
| 467 | { |
| 468 | return (unsigned long)ip + *ip; |
| 469 | } |
| 470 | |
| 471 | static int orc_sort_cmp(const void *_a, const void *_b) |
| 472 | { |
| 473 | struct orc_entry *orc_a, *orc_b; |
| 474 | const int *a = g_orc_ip_table + *(int *)_a; |
| 475 | const int *b = g_orc_ip_table + *(int *)_b; |
| 476 | unsigned long a_val = orc_ip(a); |
| 477 | unsigned long b_val = orc_ip(b); |
| 478 | |
| 479 | if (a_val > b_val) |
| 480 | return 1; |
| 481 | if (a_val < b_val) |
| 482 | return -1; |
| 483 | |
| 484 | /* |
| 485 | * The "weak" section terminator entries need to always be on the left |
| 486 | * to ensure the lookup code skips them in favor of real entries. |
| 487 | * These terminator entries exist to handle any gaps created by |
| 488 | * whitelisted .o files which didn't get objtool generation. |
| 489 | */ |
| 490 | orc_a = g_orc_table + (a - g_orc_ip_table); |
| 491 | orc_b = g_orc_table + (b - g_orc_ip_table); |
| 492 | if (orc_a->type == ORC_TYPE_UNDEFINED && orc_b->type == ORC_TYPE_UNDEFINED) |
| 493 | return 0; |
| 494 | return orc_a->type == ORC_TYPE_UNDEFINED ? -1 : 1; |
| 495 | } |
| 496 | |
| 497 | static void *sort_orctable(void *arg) |
| 498 | { |
| 499 | int i; |
| 500 | int *idxs = NULL; |
| 501 | int *tmp_orc_ip_table = NULL; |
| 502 | struct orc_entry *tmp_orc_table = NULL; |
| 503 | unsigned int *orc_ip_size = (unsigned int *)arg; |
| 504 | unsigned int num_entries = *orc_ip_size / sizeof(int); |
| 505 | unsigned int orc_size = num_entries * sizeof(struct orc_entry); |
| 506 | |
| 507 | idxs = (int *)malloc(*orc_ip_size); |
| 508 | if (!idxs) { |
| 509 | snprintf(g_err, ERRSTR_MAXSZ, "malloc idxs: %s", |
| 510 | strerror(errno)); |
| 511 | pthread_exit(g_err); |
| 512 | } |
| 513 | |
| 514 | tmp_orc_ip_table = (int *)malloc(*orc_ip_size); |
| 515 | if (!tmp_orc_ip_table) { |
| 516 | snprintf(g_err, ERRSTR_MAXSZ, "malloc tmp_orc_ip_table: %s", |
| 517 | strerror(errno)); |
| 518 | pthread_exit(g_err); |
| 519 | } |
| 520 | |
| 521 | tmp_orc_table = (struct orc_entry *)malloc(orc_size); |
| 522 | if (!tmp_orc_table) { |
| 523 | snprintf(g_err, ERRSTR_MAXSZ, "malloc tmp_orc_table: %s", |
| 524 | strerror(errno)); |
| 525 | pthread_exit(g_err); |
| 526 | } |
| 527 | |
| 528 | /* initialize indices array, convert ip_table to absolute address */ |
| 529 | for (i = 0; i < num_entries; i++) { |
| 530 | idxs[i] = i; |
| 531 | tmp_orc_ip_table[i] = g_orc_ip_table[i] + i * sizeof(int); |
| 532 | } |
| 533 | memcpy(tmp_orc_table, g_orc_table, orc_size); |
| 534 | |
| 535 | qsort(idxs, num_entries, sizeof(int), orc_sort_cmp); |
| 536 | |
| 537 | for (i = 0; i < num_entries; i++) { |
| 538 | if (idxs[i] == i) |
| 539 | continue; |
| 540 | |
| 541 | /* convert back to relative address */ |
| 542 | g_orc_ip_table[i] = tmp_orc_ip_table[idxs[i]] - i * sizeof(int); |
| 543 | g_orc_table[i] = tmp_orc_table[idxs[i]]; |
| 544 | } |
| 545 | |
| 546 | free(idxs); |
| 547 | free(tmp_orc_ip_table); |
| 548 | free(tmp_orc_table); |
| 549 | pthread_exit(NULL); |
| 550 | } |
| 551 | #endif |
| 552 | |
| 553 | #ifdef MCOUNT_SORT_ENABLED |
| 554 | |
| 555 | static int compare_values_64(const void *a, const void *b) |
| 556 | { |
| 557 | uint64_t av = *(uint64_t *)a; |
| 558 | uint64_t bv = *(uint64_t *)b; |
| 559 | |
| 560 | if (av < bv) |
| 561 | return -1; |
| 562 | return av > bv; |
| 563 | } |
| 564 | |
| 565 | static int compare_values_32(const void *a, const void *b) |
| 566 | { |
| 567 | uint32_t av = *(uint32_t *)a; |
| 568 | uint32_t bv = *(uint32_t *)b; |
| 569 | |
| 570 | if (av < bv) |
| 571 | return -1; |
| 572 | return av > bv; |
| 573 | } |
| 574 | |
| 575 | static int (*compare_values)(const void *a, const void *b); |
| 576 | |
| 577 | /* Only used for sorting mcount table */ |
| 578 | static void rela_write_addend(Elf_Rela *rela, uint64_t val) |
| 579 | { |
| 580 | e.rela_write_addend(rela, val); |
| 581 | } |
| 582 | |
| 583 | struct func_info { |
| 584 | uint64_t addr; |
| 585 | uint64_t size; |
| 586 | }; |
| 587 | |
| 588 | /* List of functions created by: nm -S vmlinux */ |
| 589 | static struct func_info *function_list; |
| 590 | static int function_list_size; |
| 591 | |
| 592 | /* Allocate functions in 1k blocks */ |
| 593 | #define FUNC_BLK_SIZE 1024 |
| 594 | #define FUNC_BLK_MASK (FUNC_BLK_SIZE - 1) |
| 595 | |
| 596 | static int add_field(uint64_t addr, uint64_t size) |
| 597 | { |
| 598 | struct func_info *fi; |
| 599 | int fsize = function_list_size; |
| 600 | |
| 601 | if (!(fsize & FUNC_BLK_MASK)) { |
| 602 | fsize += FUNC_BLK_SIZE; |
| 603 | fi = realloc(function_list, fsize * sizeof(struct func_info)); |
| 604 | if (!fi) |
| 605 | return -1; |
| 606 | function_list = fi; |
| 607 | } |
| 608 | fi = &function_list[function_list_size++]; |
| 609 | fi->addr = addr; |
| 610 | fi->size = size; |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | /* Used for when mcount/fentry is before the function entry */ |
| 615 | static int before_func; |
| 616 | |
| 617 | /* Only return match if the address lies inside the function size */ |
| 618 | static int cmp_func_addr(const void *K, const void *A) |
| 619 | { |
| 620 | uint64_t key = *(const uint64_t *)K; |
| 621 | const struct func_info *a = A; |
| 622 | |
| 623 | if (key + before_func < a->addr) |
| 624 | return -1; |
| 625 | return key >= a->addr + a->size; |
| 626 | } |
| 627 | |
| 628 | /* Find the function in function list that is bounded by the function size */ |
| 629 | static int find_func(uint64_t key) |
| 630 | { |
| 631 | return bsearch(&key, function_list, function_list_size, |
| 632 | sizeof(struct func_info), cmp_func_addr) != NULL; |
| 633 | } |
| 634 | |
| 635 | static int cmp_funcs(const void *A, const void *B) |
| 636 | { |
| 637 | const struct func_info *a = A; |
| 638 | const struct func_info *b = B; |
| 639 | |
| 640 | if (a->addr < b->addr) |
| 641 | return -1; |
| 642 | return a->addr > b->addr; |
| 643 | } |
| 644 | |
| 645 | static int parse_symbols(const char *fname) |
| 646 | { |
| 647 | FILE *fp; |
| 648 | char addr_str[20]; /* Only need 17, but round up to next int size */ |
| 649 | char size_str[20]; |
| 650 | char type; |
| 651 | |
| 652 | fp = fopen(fname, "r"); |
| 653 | if (!fp) { |
| 654 | perror(fname); |
| 655 | return -1; |
| 656 | } |
| 657 | |
| 658 | while (fscanf(fp, "%16s %16s %c %*s\n", addr_str, size_str, &type) == 3) { |
| 659 | uint64_t addr; |
| 660 | uint64_t size; |
| 661 | |
| 662 | /* Only care about functions */ |
| 663 | if (type != 't' && type != 'T' && type != 'W') |
| 664 | continue; |
| 665 | |
| 666 | addr = strtoull(addr_str, NULL, 16); |
| 667 | size = strtoull(size_str, NULL, 16); |
| 668 | if (add_field(addr, size) < 0) |
| 669 | return -1; |
| 670 | } |
| 671 | fclose(fp); |
| 672 | |
| 673 | qsort(function_list, function_list_size, sizeof(struct func_info), cmp_funcs); |
| 674 | |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | static pthread_t mcount_sort_thread; |
| 679 | static bool sort_reloc; |
| 680 | |
| 681 | static long rela_type; |
| 682 | |
| 683 | static char m_err[ERRSTR_MAXSZ]; |
| 684 | |
| 685 | struct elf_mcount_loc { |
| 686 | Elf_Ehdr *ehdr; |
| 687 | Elf_Shdr *init_data_sec; |
| 688 | uint64_t start_mcount_loc; |
| 689 | uint64_t stop_mcount_loc; |
| 690 | }; |
| 691 | |
| 692 | /* Fill the array with the content of the relocs */ |
| 693 | static int fill_relocs(void *ptr, uint64_t size, Elf_Ehdr *ehdr, uint64_t start_loc) |
| 694 | { |
| 695 | Elf_Shdr *shdr_start; |
| 696 | Elf_Rela *rel; |
| 697 | unsigned int shnum; |
| 698 | unsigned int count = 0; |
| 699 | int shentsize; |
| 700 | void *array_end = ptr + size; |
| 701 | |
| 702 | shdr_start = (Elf_Shdr *)((char *)ehdr + ehdr_shoff(ehdr)); |
| 703 | shentsize = ehdr_shentsize(ehdr); |
| 704 | |
| 705 | shnum = ehdr_shnum(ehdr); |
| 706 | if (shnum == SHN_UNDEF) |
| 707 | shnum = shdr_size(shdr_start); |
| 708 | |
| 709 | for (int i = 0; i < shnum; i++) { |
| 710 | Elf_Shdr *shdr = get_index(shdr_start, shentsize, i); |
| 711 | void *end; |
| 712 | |
| 713 | if (shdr_type(shdr) != SHT_RELA) |
| 714 | continue; |
| 715 | |
| 716 | rel = (void *)ehdr + shdr_offset(shdr); |
| 717 | end = (void *)rel + shdr_size(shdr); |
| 718 | |
| 719 | for (; (void *)rel < end; rel = (void *)rel + shdr_entsize(shdr)) { |
| 720 | uint64_t offset = rela_offset(rel); |
| 721 | |
| 722 | if (offset >= start_loc && offset < start_loc + size) { |
| 723 | if (ptr + long_size > array_end) { |
| 724 | snprintf(m_err, ERRSTR_MAXSZ, |
| 725 | "Too many relocations"); |
| 726 | return -1; |
| 727 | } |
| 728 | |
| 729 | /* Make sure this has the correct type */ |
| 730 | if (rela_info(rel) != rela_type) { |
| 731 | snprintf(m_err, ERRSTR_MAXSZ, |
| 732 | "rela has type %lx but expected %lx\n", |
| 733 | (long)rela_info(rel), rela_type); |
| 734 | return -1; |
| 735 | } |
| 736 | |
| 737 | if (long_size == 4) |
| 738 | *(uint32_t *)ptr = rela_addend(rel); |
| 739 | else |
| 740 | *(uint64_t *)ptr = rela_addend(rel); |
| 741 | ptr += long_size; |
| 742 | count++; |
| 743 | } |
| 744 | } |
| 745 | } |
| 746 | return count; |
| 747 | } |
| 748 | |
| 749 | /* Put the sorted vals back into the relocation elements */ |
| 750 | static void replace_relocs(void *ptr, uint64_t size, Elf_Ehdr *ehdr, uint64_t start_loc) |
| 751 | { |
| 752 | Elf_Shdr *shdr_start; |
| 753 | Elf_Rela *rel; |
| 754 | unsigned int shnum; |
| 755 | int shentsize; |
| 756 | |
| 757 | shdr_start = (Elf_Shdr *)((char *)ehdr + ehdr_shoff(ehdr)); |
| 758 | shentsize = ehdr_shentsize(ehdr); |
| 759 | |
| 760 | shnum = ehdr_shnum(ehdr); |
| 761 | if (shnum == SHN_UNDEF) |
| 762 | shnum = shdr_size(shdr_start); |
| 763 | |
| 764 | for (int i = 0; i < shnum; i++) { |
| 765 | Elf_Shdr *shdr = get_index(shdr_start, shentsize, i); |
| 766 | void *end; |
| 767 | |
| 768 | if (shdr_type(shdr) != SHT_RELA) |
| 769 | continue; |
| 770 | |
| 771 | rel = (void *)ehdr + shdr_offset(shdr); |
| 772 | end = (void *)rel + shdr_size(shdr); |
| 773 | |
| 774 | for (; (void *)rel < end; rel = (void *)rel + shdr_entsize(shdr)) { |
| 775 | uint64_t offset = rela_offset(rel); |
| 776 | |
| 777 | if (offset >= start_loc && offset < start_loc + size) { |
| 778 | if (long_size == 4) |
| 779 | rela_write_addend(rel, *(uint32_t *)ptr); |
| 780 | else |
| 781 | rela_write_addend(rel, *(uint64_t *)ptr); |
| 782 | ptr += long_size; |
| 783 | } |
| 784 | } |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | static int fill_addrs(void *ptr, uint64_t size, void *addrs) |
| 789 | { |
| 790 | void *end = ptr + size; |
| 791 | int count = 0; |
| 792 | |
| 793 | for (; ptr < end; ptr += long_size, addrs += long_size, count++) { |
| 794 | if (long_size == 4) |
| 795 | *(uint32_t *)ptr = r(addrs); |
| 796 | else |
| 797 | *(uint64_t *)ptr = r8(addrs); |
| 798 | } |
| 799 | return count; |
| 800 | } |
| 801 | |
| 802 | static void replace_addrs(void *ptr, uint64_t size, void *addrs) |
| 803 | { |
| 804 | void *end = ptr + size; |
| 805 | |
| 806 | for (; ptr < end; ptr += long_size, addrs += long_size) { |
| 807 | if (long_size == 4) |
| 808 | w(*(uint32_t *)ptr, addrs); |
| 809 | else |
| 810 | w8(*(uint64_t *)ptr, addrs); |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | /* Sort the addresses stored between __start_mcount_loc to __stop_mcount_loc in vmlinux */ |
| 815 | static void *sort_mcount_loc(void *arg) |
| 816 | { |
| 817 | struct elf_mcount_loc *emloc = (struct elf_mcount_loc *)arg; |
| 818 | uint64_t offset = emloc->start_mcount_loc - shdr_addr(emloc->init_data_sec) |
| 819 | + shdr_offset(emloc->init_data_sec); |
| 820 | uint64_t size = emloc->stop_mcount_loc - emloc->start_mcount_loc; |
| 821 | unsigned char *start_loc = (void *)emloc->ehdr + offset; |
| 822 | Elf_Ehdr *ehdr = emloc->ehdr; |
| 823 | void *e_msg = NULL; |
| 824 | void *vals; |
| 825 | int count; |
| 826 | |
| 827 | vals = malloc(long_size * size); |
| 828 | if (!vals) { |
| 829 | snprintf(m_err, ERRSTR_MAXSZ, "Failed to allocate sort array"); |
| 830 | pthread_exit(m_err); |
| 831 | } |
| 832 | |
| 833 | if (sort_reloc) { |
| 834 | count = fill_relocs(vals, size, ehdr, emloc->start_mcount_loc); |
| 835 | /* gcc may use relocs to save the addresses, but clang does not. */ |
| 836 | if (!count) { |
| 837 | count = fill_addrs(vals, size, start_loc); |
| 838 | sort_reloc = 0; |
| 839 | } |
| 840 | } else |
| 841 | count = fill_addrs(vals, size, start_loc); |
| 842 | |
| 843 | if (count < 0) { |
| 844 | e_msg = m_err; |
| 845 | goto out; |
| 846 | } |
| 847 | |
| 848 | if (count != size / long_size) { |
| 849 | snprintf(m_err, ERRSTR_MAXSZ, "Expected %u mcount elements but found %u\n", |
| 850 | (int)(size / long_size), count); |
| 851 | e_msg = m_err; |
| 852 | goto out; |
| 853 | } |
| 854 | |
| 855 | /* zero out any locations not found by function list */ |
| 856 | if (function_list_size) { |
| 857 | for (void *ptr = vals; ptr < vals + size; ptr += long_size) { |
| 858 | uint64_t key; |
| 859 | |
| 860 | key = long_size == 4 ? *(uint32_t *)ptr : *(uint64_t *)ptr; |
| 861 | if (!find_func(key)) { |
| 862 | if (long_size == 4) |
| 863 | *(uint32_t *)ptr = 0; |
| 864 | else |
| 865 | *(uint64_t *)ptr = 0; |
| 866 | } |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | compare_values = long_size == 4 ? compare_values_32 : compare_values_64; |
| 871 | |
| 872 | qsort(vals, count, long_size, compare_values); |
| 873 | |
| 874 | if (sort_reloc) |
| 875 | replace_relocs(vals, size, ehdr, emloc->start_mcount_loc); |
| 876 | else |
| 877 | replace_addrs(vals, size, start_loc); |
| 878 | |
| 879 | out: |
| 880 | free(vals); |
| 881 | |
| 882 | pthread_exit(e_msg); |
| 883 | } |
| 884 | |
| 885 | /* Get the address of __start_mcount_loc and __stop_mcount_loc in System.map */ |
| 886 | static void get_mcount_loc(struct elf_mcount_loc *emloc, Elf_Shdr *symtab_sec, |
| 887 | const char *strtab) |
| 888 | { |
| 889 | Elf_Sym *sym, *end_sym; |
| 890 | int symentsize = shdr_entsize(symtab_sec); |
| 891 | int found = 0; |
| 892 | |
| 893 | sym = (void *)emloc->ehdr + shdr_offset(symtab_sec); |
| 894 | end_sym = (void *)sym + shdr_size(symtab_sec); |
| 895 | |
| 896 | while (sym < end_sym) { |
| 897 | if (!strcmp(strtab + sym_name(sym), "__start_mcount_loc")) { |
| 898 | emloc->start_mcount_loc = sym_value(sym); |
| 899 | if (++found == 2) |
| 900 | break; |
| 901 | } else if (!strcmp(strtab + sym_name(sym), "__stop_mcount_loc")) { |
| 902 | emloc->stop_mcount_loc = sym_value(sym); |
| 903 | if (++found == 2) |
| 904 | break; |
| 905 | } |
| 906 | sym = (void *)sym + symentsize; |
| 907 | } |
| 908 | |
| 909 | if (!emloc->start_mcount_loc) { |
| 910 | fprintf(stderr, "get start_mcount_loc error!"); |
| 911 | return; |
| 912 | } |
| 913 | |
| 914 | if (!emloc->stop_mcount_loc) { |
| 915 | fprintf(stderr, "get stop_mcount_loc error!"); |
| 916 | return; |
| 917 | } |
| 918 | } |
| 919 | #else /* MCOUNT_SORT_ENABLED */ |
| 920 | static inline int parse_symbols(const char *fname) { return 0; } |
| 921 | #endif |
| 922 | |
| 923 | static int do_sort(Elf_Ehdr *ehdr, |
| 924 | char const *const fname, |
| 925 | table_sort_t custom_sort) |
| 926 | { |
| 927 | int rc = -1; |
| 928 | Elf_Shdr *shdr_start; |
| 929 | Elf_Shdr *strtab_sec = NULL; |
| 930 | Elf_Shdr *symtab_sec = NULL; |
| 931 | Elf_Shdr *extab_sec = NULL; |
| 932 | Elf_Shdr *string_sec; |
| 933 | Elf_Sym *sym; |
| 934 | const Elf_Sym *symtab; |
| 935 | Elf32_Word *symtab_shndx = NULL; |
| 936 | Elf_Sym *sort_needed_sym = NULL; |
| 937 | Elf_Shdr *sort_needed_sec; |
| 938 | uint32_t *sort_needed_loc; |
| 939 | void *sym_start; |
| 940 | void *sym_end; |
| 941 | const char *secstrings; |
| 942 | const char *strtab; |
| 943 | char *extab_image; |
| 944 | int sort_need_index; |
| 945 | int symentsize; |
| 946 | int shentsize; |
| 947 | int idx; |
| 948 | int i; |
| 949 | unsigned int shnum; |
| 950 | unsigned int shstrndx; |
| 951 | #ifdef MCOUNT_SORT_ENABLED |
| 952 | struct elf_mcount_loc mstruct = {0}; |
| 953 | #endif |
| 954 | #ifdef UNWINDER_ORC_ENABLED |
| 955 | unsigned int orc_ip_size = 0; |
| 956 | unsigned int orc_size = 0; |
| 957 | unsigned int orc_num_entries = 0; |
| 958 | #endif |
| 959 | |
| 960 | shdr_start = (Elf_Shdr *)((char *)ehdr + ehdr_shoff(ehdr)); |
| 961 | shentsize = ehdr_shentsize(ehdr); |
| 962 | |
| 963 | shstrndx = ehdr_shstrndx(ehdr); |
| 964 | if (shstrndx == SHN_XINDEX) |
| 965 | shstrndx = shdr_link(shdr_start); |
| 966 | string_sec = get_index(shdr_start, shentsize, shstrndx); |
| 967 | secstrings = (const char *)ehdr + shdr_offset(string_sec); |
| 968 | |
| 969 | shnum = ehdr_shnum(ehdr); |
| 970 | if (shnum == SHN_UNDEF) |
| 971 | shnum = shdr_size(shdr_start); |
| 972 | |
| 973 | for (i = 0; i < shnum; i++) { |
| 974 | Elf_Shdr *shdr = get_index(shdr_start, shentsize, i); |
| 975 | |
| 976 | idx = shdr_name(shdr); |
| 977 | if (!strcmp(secstrings + idx, "__ex_table")) |
| 978 | extab_sec = shdr; |
| 979 | if (!strcmp(secstrings + idx, ".symtab")) |
| 980 | symtab_sec = shdr; |
| 981 | if (!strcmp(secstrings + idx, ".strtab")) |
| 982 | strtab_sec = shdr; |
| 983 | |
| 984 | if (shdr_type(shdr) == SHT_SYMTAB_SHNDX) |
| 985 | symtab_shndx = (Elf32_Word *)((const char *)ehdr + |
| 986 | shdr_offset(shdr)); |
| 987 | |
| 988 | #ifdef MCOUNT_SORT_ENABLED |
| 989 | /* locate the .init.data section in vmlinux */ |
| 990 | if (!strcmp(secstrings + idx, ".init.data")) |
| 991 | mstruct.init_data_sec = shdr; |
| 992 | #endif |
| 993 | |
| 994 | #ifdef UNWINDER_ORC_ENABLED |
| 995 | /* locate the ORC unwind tables */ |
| 996 | if (!strcmp(secstrings + idx, ".orc_unwind_ip")) { |
| 997 | orc_ip_size = shdr_size(shdr); |
| 998 | g_orc_ip_table = (int *)((void *)ehdr + |
| 999 | shdr_offset(shdr)); |
| 1000 | } |
| 1001 | if (!strcmp(secstrings + idx, ".orc_unwind")) { |
| 1002 | orc_size = shdr_size(shdr); |
| 1003 | g_orc_table = (struct orc_entry *)((void *)ehdr + |
| 1004 | shdr_offset(shdr)); |
| 1005 | } |
| 1006 | #endif |
| 1007 | } /* for loop */ |
| 1008 | |
| 1009 | #ifdef UNWINDER_ORC_ENABLED |
| 1010 | if (!g_orc_ip_table || !g_orc_table) { |
| 1011 | fprintf(stderr, |
| 1012 | "incomplete ORC unwind tables in file: %s\n", fname); |
| 1013 | goto out; |
| 1014 | } |
| 1015 | |
| 1016 | orc_num_entries = orc_ip_size / sizeof(int); |
| 1017 | if (orc_ip_size % sizeof(int) != 0 || |
| 1018 | orc_size % sizeof(struct orc_entry) != 0 || |
| 1019 | orc_num_entries != orc_size / sizeof(struct orc_entry)) { |
| 1020 | fprintf(stderr, |
| 1021 | "inconsistent ORC unwind table entries in file: %s\n", |
| 1022 | fname); |
| 1023 | goto out; |
| 1024 | } |
| 1025 | |
| 1026 | /* create thread to sort ORC unwind tables concurrently */ |
| 1027 | if (pthread_create(&orc_sort_thread, NULL, |
| 1028 | sort_orctable, &orc_ip_size)) { |
| 1029 | fprintf(stderr, |
| 1030 | "pthread_create orc_sort_thread failed '%s': %s\n", |
| 1031 | strerror(errno), fname); |
| 1032 | goto out; |
| 1033 | } |
| 1034 | #endif |
| 1035 | if (!extab_sec) { |
| 1036 | fprintf(stderr, "no __ex_table in file: %s\n", fname); |
| 1037 | goto out; |
| 1038 | } |
| 1039 | |
| 1040 | if (!symtab_sec) { |
| 1041 | fprintf(stderr, "no .symtab in file: %s\n", fname); |
| 1042 | goto out; |
| 1043 | } |
| 1044 | |
| 1045 | if (!strtab_sec) { |
| 1046 | fprintf(stderr, "no .strtab in file: %s\n", fname); |
| 1047 | goto out; |
| 1048 | } |
| 1049 | |
| 1050 | extab_image = (void *)ehdr + shdr_offset(extab_sec); |
| 1051 | strtab = (const char *)ehdr + shdr_offset(strtab_sec); |
| 1052 | symtab = (const Elf_Sym *)((const char *)ehdr + shdr_offset(symtab_sec)); |
| 1053 | |
| 1054 | #ifdef MCOUNT_SORT_ENABLED |
| 1055 | mstruct.ehdr = ehdr; |
| 1056 | get_mcount_loc(&mstruct, symtab_sec, strtab); |
| 1057 | |
| 1058 | if (!mstruct.init_data_sec || !mstruct.start_mcount_loc || !mstruct.stop_mcount_loc) { |
| 1059 | fprintf(stderr, |
| 1060 | "incomplete mcount's sort in file: %s\n", |
| 1061 | fname); |
| 1062 | goto out; |
| 1063 | } |
| 1064 | |
| 1065 | /* create thread to sort mcount_loc concurrently */ |
| 1066 | if (pthread_create(&mcount_sort_thread, NULL, &sort_mcount_loc, &mstruct)) { |
| 1067 | fprintf(stderr, |
| 1068 | "pthread_create mcount_sort_thread failed '%s': %s\n", |
| 1069 | strerror(errno), fname); |
| 1070 | goto out; |
| 1071 | } |
| 1072 | #endif |
| 1073 | |
| 1074 | if (custom_sort) { |
| 1075 | custom_sort(extab_image, shdr_size(extab_sec)); |
| 1076 | } else { |
| 1077 | int num_entries = shdr_size(extab_sec) / extable_ent_size; |
| 1078 | qsort(extab_image, num_entries, |
| 1079 | extable_ent_size, compare_extable); |
| 1080 | } |
| 1081 | |
| 1082 | /* find the flag main_extable_sort_needed */ |
| 1083 | sym_start = (void *)ehdr + shdr_offset(symtab_sec); |
| 1084 | sym_end = sym_start + shdr_size(symtab_sec); |
| 1085 | symentsize = shdr_entsize(symtab_sec); |
| 1086 | |
| 1087 | for (sym = sym_start; (void *)sym + symentsize < sym_end; |
| 1088 | sym = (void *)sym + symentsize) { |
| 1089 | if (sym_type(sym) != STT_OBJECT) |
| 1090 | continue; |
| 1091 | if (!strcmp(strtab + sym_name(sym), |
| 1092 | "main_extable_sort_needed")) { |
| 1093 | sort_needed_sym = sym; |
| 1094 | break; |
| 1095 | } |
| 1096 | } |
| 1097 | |
| 1098 | if (!sort_needed_sym) { |
| 1099 | fprintf(stderr, |
| 1100 | "no main_extable_sort_needed symbol in file: %s\n", |
| 1101 | fname); |
| 1102 | goto out; |
| 1103 | } |
| 1104 | |
| 1105 | sort_need_index = get_secindex(sym_shndx(sym), |
| 1106 | ((void *)sort_needed_sym - (void *)symtab) / symentsize, |
| 1107 | symtab_shndx); |
| 1108 | sort_needed_sec = get_index(shdr_start, shentsize, sort_need_index); |
| 1109 | sort_needed_loc = (void *)ehdr + |
| 1110 | shdr_offset(sort_needed_sec) + |
| 1111 | sym_value(sort_needed_sym) - shdr_addr(sort_needed_sec); |
| 1112 | |
| 1113 | /* extable has been sorted, clear the flag */ |
| 1114 | w(0, sort_needed_loc); |
| 1115 | rc = 0; |
| 1116 | |
| 1117 | out: |
| 1118 | #ifdef UNWINDER_ORC_ENABLED |
| 1119 | if (orc_sort_thread) { |
| 1120 | void *retval = NULL; |
| 1121 | /* wait for ORC tables sort done */ |
| 1122 | rc = pthread_join(orc_sort_thread, &retval); |
| 1123 | if (rc) { |
| 1124 | fprintf(stderr, |
| 1125 | "pthread_join failed '%s': %s\n", |
| 1126 | strerror(errno), fname); |
| 1127 | } else if (retval) { |
| 1128 | rc = -1; |
| 1129 | fprintf(stderr, |
| 1130 | "failed to sort ORC tables '%s': %s\n", |
| 1131 | (char *)retval, fname); |
| 1132 | } |
| 1133 | } |
| 1134 | #endif |
| 1135 | |
| 1136 | #ifdef MCOUNT_SORT_ENABLED |
| 1137 | if (mcount_sort_thread) { |
| 1138 | void *retval = NULL; |
| 1139 | /* wait for mcount sort done */ |
| 1140 | rc = pthread_join(mcount_sort_thread, &retval); |
| 1141 | if (rc) { |
| 1142 | fprintf(stderr, |
| 1143 | "pthread_join failed '%s': %s\n", |
| 1144 | strerror(errno), fname); |
| 1145 | } else if (retval) { |
| 1146 | rc = -1; |
| 1147 | fprintf(stderr, |
| 1148 | "failed to sort mcount '%s': %s\n", |
| 1149 | (char *)retval, fname); |
| 1150 | } |
| 1151 | } |
| 1152 | #endif |
| 1153 | return rc; |
| 1154 | } |
| 1155 | |
| 1156 | static int compare_relative_table(const void *a, const void *b) |
| 1157 | { |
| 1158 | int32_t av = (int32_t)r(a); |
| 1159 | int32_t bv = (int32_t)r(b); |
| 1160 | |
| 1161 | if (av < bv) |
| 1162 | return -1; |
| 1163 | if (av > bv) |
| 1164 | return 1; |
| 1165 | return 0; |
| 1166 | } |
| 1167 | |
| 1168 | static void sort_relative_table(char *extab_image, int image_size) |
| 1169 | { |
| 1170 | int i = 0; |
| 1171 | |
| 1172 | /* |
| 1173 | * Do the same thing the runtime sort does, first normalize to |
| 1174 | * being relative to the start of the section. |
| 1175 | */ |
| 1176 | while (i < image_size) { |
| 1177 | uint32_t *loc = (uint32_t *)(extab_image + i); |
| 1178 | w(r(loc) + i, loc); |
| 1179 | i += 4; |
| 1180 | } |
| 1181 | |
| 1182 | qsort(extab_image, image_size / 8, 8, compare_relative_table); |
| 1183 | |
| 1184 | /* Now denormalize. */ |
| 1185 | i = 0; |
| 1186 | while (i < image_size) { |
| 1187 | uint32_t *loc = (uint32_t *)(extab_image + i); |
| 1188 | w(r(loc) - i, loc); |
| 1189 | i += 4; |
| 1190 | } |
| 1191 | } |
| 1192 | |
| 1193 | static void sort_relative_table_with_data(char *extab_image, int image_size) |
| 1194 | { |
| 1195 | int i = 0; |
| 1196 | |
| 1197 | while (i < image_size) { |
| 1198 | uint32_t *loc = (uint32_t *)(extab_image + i); |
| 1199 | |
| 1200 | w(r(loc) + i, loc); |
| 1201 | w(r(loc + 1) + i + 4, loc + 1); |
| 1202 | /* Don't touch the fixup type or data */ |
| 1203 | |
| 1204 | i += sizeof(uint32_t) * 3; |
| 1205 | } |
| 1206 | |
| 1207 | qsort(extab_image, image_size / 12, 12, compare_relative_table); |
| 1208 | |
| 1209 | i = 0; |
| 1210 | while (i < image_size) { |
| 1211 | uint32_t *loc = (uint32_t *)(extab_image + i); |
| 1212 | |
| 1213 | w(r(loc) - i, loc); |
| 1214 | w(r(loc + 1) - (i + 4), loc + 1); |
| 1215 | /* Don't touch the fixup type or data */ |
| 1216 | |
| 1217 | i += sizeof(uint32_t) * 3; |
| 1218 | } |
| 1219 | } |
| 1220 | |
| 1221 | static int do_file(char const *const fname, void *addr) |
| 1222 | { |
| 1223 | Elf_Ehdr *ehdr = addr; |
| 1224 | table_sort_t custom_sort = NULL; |
| 1225 | |
| 1226 | switch (ehdr->e32.e_ident[EI_DATA]) { |
| 1227 | case ELFDATA2LSB: |
| 1228 | r = rle; |
| 1229 | r2 = r2le; |
| 1230 | r8 = r8le; |
| 1231 | w = wle; |
| 1232 | w8 = w8le; |
| 1233 | break; |
| 1234 | case ELFDATA2MSB: |
| 1235 | r = rbe; |
| 1236 | r2 = r2be; |
| 1237 | r8 = r8be; |
| 1238 | w = wbe; |
| 1239 | w8 = w8be; |
| 1240 | break; |
| 1241 | default: |
| 1242 | fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", |
| 1243 | ehdr->e32.e_ident[EI_DATA], fname); |
| 1244 | return -1; |
| 1245 | } |
| 1246 | |
| 1247 | if (memcmp(ELFMAG, ehdr->e32.e_ident, SELFMAG) != 0 || |
| 1248 | (r2(&ehdr->e32.e_type) != ET_EXEC && r2(&ehdr->e32.e_type) != ET_DYN) || |
| 1249 | ehdr->e32.e_ident[EI_VERSION] != EV_CURRENT) { |
| 1250 | fprintf(stderr, "unrecognized ET_EXEC/ET_DYN file %s\n", fname); |
| 1251 | return -1; |
| 1252 | } |
| 1253 | |
| 1254 | switch (r2(&ehdr->e32.e_machine)) { |
| 1255 | case EM_AARCH64: |
| 1256 | #ifdef MCOUNT_SORT_ENABLED |
| 1257 | sort_reloc = true; |
| 1258 | rela_type = 0x403; |
| 1259 | /* arm64 uses patchable function entry placing before function */ |
| 1260 | before_func = 8; |
| 1261 | #endif |
| 1262 | /* fallthrough */ |
| 1263 | case EM_386: |
| 1264 | case EM_LOONGARCH: |
| 1265 | case EM_RISCV: |
| 1266 | case EM_S390: |
| 1267 | case EM_X86_64: |
| 1268 | custom_sort = sort_relative_table_with_data; |
| 1269 | break; |
| 1270 | case EM_PARISC: |
| 1271 | case EM_PPC: |
| 1272 | case EM_PPC64: |
| 1273 | custom_sort = sort_relative_table; |
| 1274 | break; |
| 1275 | case EM_ARCOMPACT: |
| 1276 | case EM_ARCV2: |
| 1277 | case EM_ARM: |
| 1278 | case EM_MICROBLAZE: |
| 1279 | case EM_MIPS: |
| 1280 | case EM_XTENSA: |
| 1281 | break; |
| 1282 | default: |
| 1283 | fprintf(stderr, "unrecognized e_machine %d %s\n", |
| 1284 | r2(&ehdr->e32.e_machine), fname); |
| 1285 | return -1; |
| 1286 | } |
| 1287 | |
| 1288 | switch (ehdr->e32.e_ident[EI_CLASS]) { |
| 1289 | case ELFCLASS32: { |
| 1290 | struct elf_funcs efuncs = { |
| 1291 | .compare_extable = compare_extable_32, |
| 1292 | .ehdr_shoff = ehdr32_shoff, |
| 1293 | .ehdr_shentsize = ehdr32_shentsize, |
| 1294 | .ehdr_shstrndx = ehdr32_shstrndx, |
| 1295 | .ehdr_shnum = ehdr32_shnum, |
| 1296 | .shdr_addr = shdr32_addr, |
| 1297 | .shdr_offset = shdr32_offset, |
| 1298 | .shdr_link = shdr32_link, |
| 1299 | .shdr_size = shdr32_size, |
| 1300 | .shdr_name = shdr32_name, |
| 1301 | .shdr_type = shdr32_type, |
| 1302 | .shdr_entsize = shdr32_entsize, |
| 1303 | .sym_type = sym32_type, |
| 1304 | .sym_name = sym32_name, |
| 1305 | .sym_value = sym32_value, |
| 1306 | .sym_shndx = sym32_shndx, |
| 1307 | .rela_offset = rela32_offset, |
| 1308 | .rela_info = rela32_info, |
| 1309 | .rela_addend = rela32_addend, |
| 1310 | .rela_write_addend = rela32_write_addend, |
| 1311 | }; |
| 1312 | |
| 1313 | e = efuncs; |
| 1314 | long_size = 4; |
| 1315 | extable_ent_size = 8; |
| 1316 | |
| 1317 | if (r2(&ehdr->e32.e_ehsize) != sizeof(Elf32_Ehdr) || |
| 1318 | r2(&ehdr->e32.e_shentsize) != sizeof(Elf32_Shdr)) { |
| 1319 | fprintf(stderr, |
| 1320 | "unrecognized ET_EXEC/ET_DYN file: %s\n", fname); |
| 1321 | return -1; |
| 1322 | } |
| 1323 | |
| 1324 | } |
| 1325 | break; |
| 1326 | case ELFCLASS64: { |
| 1327 | struct elf_funcs efuncs = { |
| 1328 | .compare_extable = compare_extable_64, |
| 1329 | .ehdr_shoff = ehdr64_shoff, |
| 1330 | .ehdr_shentsize = ehdr64_shentsize, |
| 1331 | .ehdr_shstrndx = ehdr64_shstrndx, |
| 1332 | .ehdr_shnum = ehdr64_shnum, |
| 1333 | .shdr_addr = shdr64_addr, |
| 1334 | .shdr_offset = shdr64_offset, |
| 1335 | .shdr_link = shdr64_link, |
| 1336 | .shdr_size = shdr64_size, |
| 1337 | .shdr_name = shdr64_name, |
| 1338 | .shdr_type = shdr64_type, |
| 1339 | .shdr_entsize = shdr64_entsize, |
| 1340 | .sym_type = sym64_type, |
| 1341 | .sym_name = sym64_name, |
| 1342 | .sym_value = sym64_value, |
| 1343 | .sym_shndx = sym64_shndx, |
| 1344 | .rela_offset = rela64_offset, |
| 1345 | .rela_info = rela64_info, |
| 1346 | .rela_addend = rela64_addend, |
| 1347 | .rela_write_addend = rela64_write_addend, |
| 1348 | }; |
| 1349 | |
| 1350 | e = efuncs; |
| 1351 | long_size = 8; |
| 1352 | extable_ent_size = 16; |
| 1353 | |
| 1354 | if (r2(&ehdr->e64.e_ehsize) != sizeof(Elf64_Ehdr) || |
| 1355 | r2(&ehdr->e64.e_shentsize) != sizeof(Elf64_Shdr)) { |
| 1356 | fprintf(stderr, |
| 1357 | "unrecognized ET_EXEC/ET_DYN file: %s\n", |
| 1358 | fname); |
| 1359 | return -1; |
| 1360 | } |
| 1361 | |
| 1362 | } |
| 1363 | break; |
| 1364 | default: |
| 1365 | fprintf(stderr, "unrecognized ELF class %d %s\n", |
| 1366 | ehdr->e32.e_ident[EI_CLASS], fname); |
| 1367 | return -1; |
| 1368 | } |
| 1369 | |
| 1370 | return do_sort(ehdr, fname, custom_sort); |
| 1371 | } |
| 1372 | |
| 1373 | int main(int argc, char *argv[]) |
| 1374 | { |
| 1375 | int i, n_error = 0; /* gcc-4.3.0 false positive complaint */ |
| 1376 | size_t size = 0; |
| 1377 | void *addr = NULL; |
| 1378 | int c; |
| 1379 | |
| 1380 | while ((c = getopt(argc, argv, "s:")) >= 0) { |
| 1381 | switch (c) { |
| 1382 | case 's': |
| 1383 | if (parse_symbols(optarg) < 0) { |
| 1384 | fprintf(stderr, "Could not parse %s\n", optarg); |
| 1385 | return -1; |
| 1386 | } |
| 1387 | break; |
| 1388 | default: |
| 1389 | fprintf(stderr, "usage: sorttable [-s nm-file] vmlinux...\n"); |
| 1390 | return 0; |
| 1391 | } |
| 1392 | } |
| 1393 | |
| 1394 | if ((argc - optind) < 1) { |
| 1395 | fprintf(stderr, "usage: sorttable vmlinux...\n"); |
| 1396 | return 0; |
| 1397 | } |
| 1398 | |
| 1399 | /* Process each file in turn, allowing deep failure. */ |
| 1400 | for (i = optind; i < argc; i++) { |
| 1401 | addr = mmap_file(argv[i], &size); |
| 1402 | if (!addr) { |
| 1403 | ++n_error; |
| 1404 | continue; |
| 1405 | } |
| 1406 | |
| 1407 | if (do_file(argv[i], addr)) |
| 1408 | ++n_error; |
| 1409 | |
| 1410 | munmap(addr, size); |
| 1411 | } |
| 1412 | |
| 1413 | return !!n_error; |
| 1414 | } |