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| 1 | /* Machine-dependent ELF dynamic relocation inline functions. ARM version. |
|---|---|
| 2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef dl_machine_h |
| 20 | #define dl_machine_h |
| 21 | |
| 22 | #define ELF_MACHINE_NAME "ARM" |
| 23 | |
| 24 | #include <assert.h> |
| 25 | #include <sys/param.h> |
| 26 | #include <tls.h> |
| 27 | #include <dl-tlsdesc.h> |
| 28 | #include <dl-irel.h> |
| 29 | #include <dl-static-tls.h> |
| 30 | #include <dl-machine-rel.h> |
| 31 | |
| 32 | #ifndef CLEAR_CACHE |
| 33 | # error CLEAR_CACHE definition required to handle TEXTREL |
| 34 | #endif |
| 35 | |
| 36 | /* Return nonzero iff ELF header is compatible with the running host. */ |
| 37 | static inline int __attribute__ ((unused)) |
| 38 | elf_machine_matches_host (const Elf32_Ehdr *ehdr) |
| 39 | { |
| 40 | return ehdr->e_machine == EM_ARM; |
| 41 | } |
| 42 | |
| 43 | /* Return the run-time load address of the shared object. */ |
| 44 | static inline ElfW(Addr) __attribute__ ((unused)) |
| 45 | elf_machine_load_address (void) |
| 46 | { |
| 47 | extern const ElfW(Ehdr) __ehdr_start attribute_hidden; |
| 48 | return (ElfW(Addr)) &__ehdr_start; |
| 49 | } |
| 50 | |
| 51 | /* Return the link-time address of _DYNAMIC. */ |
| 52 | static inline ElfW(Addr) __attribute__ ((unused)) |
| 53 | elf_machine_dynamic (void) |
| 54 | { |
| 55 | extern ElfW(Dyn) _DYNAMIC[] attribute_hidden; |
| 56 | return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address (); |
| 57 | } |
| 58 | |
| 59 | /* Set up the loaded object described by L so its unrelocated PLT |
| 60 | entries will jump to the on-demand fixup code in dl-runtime.c. */ |
| 61 | |
| 62 | static inline int __attribute__ ((unused)) |
| 63 | elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], |
| 64 | int lazy, int profile) |
| 65 | { |
| 66 | Elf32_Addr *got; |
| 67 | extern void _dl_runtime_resolve (Elf32_Word); |
| 68 | extern void _dl_runtime_profile (Elf32_Word); |
| 69 | |
| 70 | if (l->l_info[DT_JMPREL] && lazy) |
| 71 | { |
| 72 | /* patb: this is different than i386 */ |
| 73 | /* The GOT entries for functions in the PLT have not yet been filled |
| 74 | in. Their initial contents will arrange when called to push an |
| 75 | index into the .got section, load ip with &_GLOBAL_OFFSET_TABLE_[3], |
| 76 | and then jump to _GLOBAL_OFFSET_TABLE[2]. */ |
| 77 | got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); |
| 78 | /* If a library is prelinked but we have to relocate anyway, |
| 79 | we have to be able to undo the prelinking of .got.plt. |
| 80 | The prelinker saved us here address of .plt. */ |
| 81 | if (got[1]) |
| 82 | l->l_mach.plt = got[1] + l->l_addr; |
| 83 | got[1] = (Elf32_Addr) l; /* Identify this shared object. */ |
| 84 | |
| 85 | /* The got[2] entry contains the address of a function which gets |
| 86 | called to get the address of a so far unresolved function and |
| 87 | jump to it. The profiling extension of the dynamic linker allows |
| 88 | to intercept the calls to collect information. In this case we |
| 89 | don't store the address in the GOT so that all future calls also |
| 90 | end in this function. */ |
| 91 | if (profile) |
| 92 | { |
| 93 | got[2] = (Elf32_Addr) &_dl_runtime_profile; |
| 94 | |
| 95 | if (GLRO(dl_profile) != NULL |
| 96 | && _dl_name_match_p (GLRO(dl_profile), l)) |
| 97 | /* Say that we really want profiling and the timers are |
| 98 | started. */ |
| 99 | GL(dl_profile_map) = l; |
| 100 | } |
| 101 | else |
| 102 | /* This function will get called to fix up the GOT entry indicated by |
| 103 | the offset on the stack, and then jump to the resolved address. */ |
| 104 | got[2] = (Elf32_Addr) &_dl_runtime_resolve; |
| 105 | } |
| 106 | |
| 107 | return lazy; |
| 108 | } |
| 109 | |
| 110 | #if defined(ARCH_HAS_BX) |
| 111 | #define BX(x) "bx\t" #x |
| 112 | #else |
| 113 | #define BX(x) "mov\tpc, " #x |
| 114 | #endif |
| 115 | |
| 116 | /* Mask identifying addresses reserved for the user program, |
| 117 | where the dynamic linker should not map anything. */ |
| 118 | #define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL |
| 119 | |
| 120 | /* Initial entry point code for the dynamic linker. |
| 121 | The C function `_dl_start' is the real entry point; |
| 122 | its return value is the user program's entry point. */ |
| 123 | |
| 124 | #define RTLD_START asm ("\ |
| 125 | .text\n\ |
| 126 | .globl _start\n\ |
| 127 | .type _start, %function\n\ |
| 128 | .globl _dl_start_user\n\ |
| 129 | .type _dl_start_user, %function\n\ |
| 130 | _start:\n\ |
| 131 | @ we are PIC code, so get global offset table\n\ |
| 132 | ldr sl, .L_GET_GOT\n\ |
| 133 | @ See if we were run as a command with the executable file\n\ |
| 134 | @ name as an extra leading argument.\n\ |
| 135 | ldr r4, .L_SKIP_ARGS\n\ |
| 136 | @ at start time, all the args are on the stack\n\ |
| 137 | mov r0, sp\n\ |
| 138 | bl _dl_start\n\ |
| 139 | @ returns user entry point in r0\n\ |
| 140 | _dl_start_user:\n\ |
| 141 | adr r6, .L_GET_GOT\n\ |
| 142 | add sl, sl, r6\n\ |
| 143 | ldr r4, [sl, r4]\n\ |
| 144 | @ save the entry point in another register\n\ |
| 145 | mov r6, r0\n\ |
| 146 | @ get the original arg count\n\ |
| 147 | ldr r1, [sp]\n\ |
| 148 | @ get the argv address\n\ |
| 149 | add r2, sp, #4\n\ |
| 150 | @ Fix up the stack if necessary.\n\ |
| 151 | cmp r4, #0\n\ |
| 152 | bne .L_fixup_stack\n\ |
| 153 | .L_done_fixup:\n\ |
| 154 | @ compute envp\n\ |
| 155 | add r3, r2, r1, lsl #2\n\ |
| 156 | add r3, r3, #4\n\ |
| 157 | @ now we call _dl_init\n\ |
| 158 | ldr r0, .L_LOADED\n\ |
| 159 | ldr r0, [sl, r0]\n\ |
| 160 | @ call _dl_init\n\ |
| 161 | bl _dl_init(PLT)\n\ |
| 162 | @ load the finalizer function\n\ |
| 163 | ldr r0, .L_FINI_PROC\n\ |
| 164 | add r0, sl, r0\n\ |
| 165 | @ jump to the user_s entry point\n\ |
| 166 | " BX(r6) "\n\ |
| 167 | \n\ |
| 168 | @ iWMMXt and EABI targets require the stack to be eight byte\n\ |
| 169 | @ aligned - shuffle arguments etc.\n\ |
| 170 | .L_fixup_stack:\n\ |
| 171 | @ subtract _dl_skip_args from original arg count\n\ |
| 172 | sub r1, r1, r4\n\ |
| 173 | @ store the new argc in the new stack location\n\ |
| 174 | str r1, [sp]\n\ |
| 175 | @ find the first unskipped argument\n\ |
| 176 | mov r3, r2\n\ |
| 177 | add r4, r2, r4, lsl #2\n\ |
| 178 | @ shuffle argv down\n\ |
| 179 | 1: ldr r5, [r4], #4\n\ |
| 180 | str r5, [r3], #4\n\ |
| 181 | cmp r5, #0\n\ |
| 182 | bne 1b\n\ |
| 183 | @ shuffle envp down\n\ |
| 184 | 1: ldr r5, [r4], #4\n\ |
| 185 | str r5, [r3], #4\n\ |
| 186 | cmp r5, #0\n\ |
| 187 | bne 1b\n\ |
| 188 | @ shuffle auxv down\n\ |
| 189 | 1: ldmia r4!, {r0, r5}\n\ |
| 190 | stmia r3!, {r0, r5}\n\ |
| 191 | cmp r0, #0\n\ |
| 192 | bne 1b\n\ |
| 193 | @ Update _dl_argv\n\ |
| 194 | ldr r3, .L_ARGV\n\ |
| 195 | str r2, [sl, r3]\n\ |
| 196 | b .L_done_fixup\n\ |
| 197 | \n\ |
| 198 | .L_GET_GOT:\n\ |
| 199 | .word _GLOBAL_OFFSET_TABLE_ - .L_GET_GOT\n\ |
| 200 | .L_SKIP_ARGS:\n\ |
| 201 | .word _dl_skip_args(GOTOFF)\n\ |
| 202 | .L_FINI_PROC:\n\ |
| 203 | .word _dl_fini(GOTOFF)\n\ |
| 204 | .L_ARGV:\n\ |
| 205 | .word __GI__dl_argv(GOTOFF)\n\ |
| 206 | .L_LOADED:\n\ |
| 207 | .word _rtld_local(GOTOFF)\n\ |
| 208 | .previous\n\ |
| 209 | "); |
| 210 | |
| 211 | /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or |
| 212 | TLS variable, so undefined references should not be allowed to |
| 213 | define the value. |
| 214 | ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one |
| 215 | of the main executable's symbols, as for a COPY reloc. |
| 216 | ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA iff TYPE describes relocation against |
| 217 | protected data whose address may be external due to copy relocation. */ |
| 218 | #ifndef RTLD_BOOTSTRAP |
| 219 | # define elf_machine_type_class(type) \ |
| 220 | ((((type) == R_ARM_JUMP_SLOT || (type) == R_ARM_TLS_DTPMOD32 \ |
| 221 | || (type) == R_ARM_TLS_DTPOFF32 || (type) == R_ARM_TLS_TPOFF32 \ |
| 222 | || (type) == R_ARM_TLS_DESC) \ |
| 223 | * ELF_RTYPE_CLASS_PLT) \ |
| 224 | | (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY) \ |
| 225 | | (((type) == R_ARM_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) |
| 226 | #else |
| 227 | #define elf_machine_type_class(type) \ |
| 228 | ((((type) == R_ARM_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ |
| 229 | | (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY) \ |
| 230 | | (((type) == R_ARM_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) |
| 231 | #endif |
| 232 | |
| 233 | /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ |
| 234 | #define ELF_MACHINE_JMP_SLOT R_ARM_JUMP_SLOT |
| 235 | |
| 236 | /* We define an initialization functions. This is called very early in |
| 237 | _dl_sysdep_start. */ |
| 238 | #define DL_PLATFORM_INIT dl_platform_init () |
| 239 | |
| 240 | static inline void __attribute__ ((unused)) |
| 241 | dl_platform_init (void) |
| 242 | { |
| 243 | if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') |
| 244 | /* Avoid an empty string which would disturb us. */ |
| 245 | GLRO(dl_platform) = NULL; |
| 246 | } |
| 247 | |
| 248 | static inline Elf32_Addr |
| 249 | elf_machine_fixup_plt (struct link_map *map, lookup_t t, |
| 250 | const ElfW(Sym) *refsym, const ElfW(Sym) *sym, |
| 251 | const Elf32_Rel *reloc, |
| 252 | Elf32_Addr *reloc_addr, Elf32_Addr value) |
| 253 | { |
| 254 | return *reloc_addr = value; |
| 255 | } |
| 256 | |
| 257 | /* Return the final value of a plt relocation. */ |
| 258 | static inline Elf32_Addr |
| 259 | elf_machine_plt_value (struct link_map *map, const Elf32_Rel *reloc, |
| 260 | Elf32_Addr value) |
| 261 | { |
| 262 | return value; |
| 263 | } |
| 264 | |
| 265 | #endif /* !dl_machine_h */ |
| 266 | |
| 267 | |
| 268 | /* Names of the architecture-specific auditing callback functions. */ |
| 269 | #define ARCH_LA_PLTENTER arm_gnu_pltenter |
| 270 | #define ARCH_LA_PLTEXIT arm_gnu_pltexit |
| 271 | |
| 272 | #ifdef RESOLVE_MAP |
| 273 | /* Handle a PC24 reloc, including the out-of-range case. */ |
| 274 | static void |
| 275 | relocate_pc24 (struct link_map *map, Elf32_Addr value, |
| 276 | Elf32_Addr *const reloc_addr, Elf32_Sword addend) |
| 277 | { |
| 278 | Elf32_Addr new_value; |
| 279 | |
| 280 | /* Set NEW_VALUE based on V, and return true iff it overflows 24 bits. */ |
| 281 | inline bool set_new_value (Elf32_Addr v) |
| 282 | { |
| 283 | new_value = v + addend - (Elf32_Addr) reloc_addr; |
| 284 | Elf32_Addr topbits = new_value & 0xfe000000; |
| 285 | return topbits != 0xfe000000 && topbits != 0x00000000; |
| 286 | } |
| 287 | |
| 288 | if (set_new_value (value)) |
| 289 | { |
| 290 | /* The PC-relative address doesn't fit in 24 bits! */ |
| 291 | |
| 292 | static void *fix_page; |
| 293 | static size_t fix_offset; |
| 294 | if (fix_page == NULL) |
| 295 | { |
| 296 | void *new_page = __mmap (NULL, GLRO(dl_pagesize), |
| 297 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 298 | MAP_PRIVATE | MAP_ANON, -1, 0); |
| 299 | if (new_page == MAP_FAILED) |
| 300 | _dl_signal_error (0, map->l_name, NULL, |
| 301 | "could not map page for fixup"); |
| 302 | fix_page = new_page; |
| 303 | assert (fix_offset == 0); |
| 304 | } |
| 305 | |
| 306 | Elf32_Word *fix_address = fix_page + fix_offset; |
| 307 | fix_address[0] = 0xe51ff004; /* ldr pc, [pc, #-4] */ |
| 308 | fix_address[1] = value; |
| 309 | |
| 310 | fix_offset += sizeof fix_address[0] * 2; |
| 311 | if (fix_offset >= GLRO(dl_pagesize)) |
| 312 | { |
| 313 | fix_page = NULL; |
| 314 | fix_offset = 0; |
| 315 | } |
| 316 | |
| 317 | if (set_new_value ((Elf32_Addr) fix_address)) |
| 318 | _dl_signal_error (0, map->l_name, NULL, |
| 319 | "R_ARM_PC24 relocation out of range"); |
| 320 | } |
| 321 | |
| 322 | *reloc_addr = (*reloc_addr & 0xff000000) | ((new_value >> 2) & 0x00ffffff); |
| 323 | } |
| 324 | |
| 325 | /* Perform the relocation specified by RELOC and SYM (which is fully resolved). |
| 326 | MAP is the object containing the reloc. */ |
| 327 | |
| 328 | static inline void |
| 329 | __attribute__ ((always_inline)) |
| 330 | elf_machine_rel (struct link_map *map, struct r_scope_elem *scope[], |
| 331 | const Elf32_Rel *reloc, const Elf32_Sym *sym, |
| 332 | const struct r_found_version *version, |
| 333 | void *const reloc_addr_arg, int skip_ifunc) |
| 334 | { |
| 335 | Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| 336 | const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| 337 | |
| 338 | #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC |
| 339 | if (__builtin_expect (r_type == R_ARM_RELATIVE, 0)) |
| 340 | { |
| 341 | # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC |
| 342 | /* This is defined in rtld.c, but nowhere in the static libc.a; |
| 343 | make the reference weak so static programs can still link. |
| 344 | This declaration cannot be done when compiling rtld.c |
| 345 | (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the |
| 346 | common defn for _dl_rtld_map, which is incompatible with a |
| 347 | weak decl in the same file. */ |
| 348 | # ifndef SHARED |
| 349 | weak_extern (_dl_rtld_map); |
| 350 | # endif |
| 351 | if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */ |
| 352 | # endif |
| 353 | *reloc_addr += map->l_addr; |
| 354 | } |
| 355 | # ifndef RTLD_BOOTSTRAP |
| 356 | else if (__builtin_expect (r_type == R_ARM_NONE, 0)) |
| 357 | return; |
| 358 | # endif |
| 359 | else |
| 360 | #endif |
| 361 | { |
| 362 | const Elf32_Sym *const refsym = sym; |
| 363 | struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, |
| 364 | r_type); |
| 365 | Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true); |
| 366 | |
| 367 | if (sym != NULL |
| 368 | && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) |
| 369 | && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) |
| 370 | && __builtin_expect (!skip_ifunc, 1)) |
| 371 | value = elf_ifunc_invoke (value); |
| 372 | |
| 373 | switch (r_type) |
| 374 | { |
| 375 | case R_ARM_COPY: |
| 376 | if (sym == NULL) |
| 377 | /* This can happen in trace mode if an object could not be |
| 378 | found. */ |
| 379 | break; |
| 380 | if (sym->st_size > refsym->st_size |
| 381 | || (GLRO(dl_verbose) && sym->st_size < refsym->st_size)) |
| 382 | { |
| 383 | const char *strtab; |
| 384 | |
| 385 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
| 386 | _dl_error_printf ("\ |
| 387 | %s: Symbol `%s' has different size in shared object, consider re-linking\n", |
| 388 | RTLD_PROGNAME, strtab + refsym->st_name); |
| 389 | } |
| 390 | memcpy (reloc_addr_arg, (void *) value, |
| 391 | MIN (sym->st_size, refsym->st_size)); |
| 392 | break; |
| 393 | case R_ARM_GLOB_DAT: |
| 394 | case R_ARM_JUMP_SLOT: |
| 395 | # ifdef RTLD_BOOTSTRAP |
| 396 | /* Fix weak undefined references. */ |
| 397 | if (sym != NULL && sym->st_value == 0) |
| 398 | *reloc_addr = 0; |
| 399 | else |
| 400 | # endif |
| 401 | *reloc_addr = value; |
| 402 | break; |
| 403 | case R_ARM_ABS32: |
| 404 | { |
| 405 | struct unaligned |
| 406 | { |
| 407 | Elf32_Addr x; |
| 408 | } __attribute__ ((packed, may_alias)); |
| 409 | # ifndef RTLD_BOOTSTRAP |
| 410 | /* This is defined in rtld.c, but nowhere in the static |
| 411 | libc.a; make the reference weak so static programs can |
| 412 | still link. This declaration cannot be done when |
| 413 | compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because |
| 414 | rtld.c contains the common defn for _dl_rtld_map, which |
| 415 | is incompatible with a weak decl in the same file. */ |
| 416 | # ifndef SHARED |
| 417 | weak_extern (_dl_rtld_map); |
| 418 | # endif |
| 419 | if (map == &GL(dl_rtld_map)) |
| 420 | /* Undo the relocation done here during bootstrapping. |
| 421 | Now we will relocate it anew, possibly using a |
| 422 | binding found in the user program or a loaded library |
| 423 | rather than the dynamic linker's built-in definitions |
| 424 | used while loading those libraries. */ |
| 425 | value -= SYMBOL_ADDRESS (map, refsym, true); |
| 426 | # endif |
| 427 | /* Support relocations on mis-aligned offsets. */ |
| 428 | ((struct unaligned *) reloc_addr)->x += value; |
| 429 | break; |
| 430 | } |
| 431 | case R_ARM_TLS_DESC: |
| 432 | { |
| 433 | struct tlsdesc *td = (struct tlsdesc *)reloc_addr; |
| 434 | |
| 435 | # ifndef RTLD_BOOTSTRAP |
| 436 | if (! sym) |
| 437 | td->entry = _dl_tlsdesc_undefweak; |
| 438 | else |
| 439 | # endif |
| 440 | { |
| 441 | if (ELF32_R_SYM (reloc->r_info) == STN_UNDEF) |
| 442 | value = td->argument.value; |
| 443 | else |
| 444 | value = sym->st_value; |
| 445 | |
| 446 | # ifndef RTLD_BOOTSTRAP |
| 447 | # ifndef SHARED |
| 448 | CHECK_STATIC_TLS (map, sym_map); |
| 449 | # else |
| 450 | if (!TRY_STATIC_TLS (map, sym_map)) |
| 451 | { |
| 452 | td->argument.pointer |
| 453 | = _dl_make_tlsdesc_dynamic (sym_map, value); |
| 454 | td->entry = _dl_tlsdesc_dynamic; |
| 455 | } |
| 456 | else |
| 457 | # endif |
| 458 | # endif |
| 459 | { |
| 460 | td->argument.value = value + sym_map->l_tls_offset; |
| 461 | td->entry = _dl_tlsdesc_return; |
| 462 | } |
| 463 | } |
| 464 | } |
| 465 | break; |
| 466 | case R_ARM_PC24: |
| 467 | relocate_pc24 (map, value, reloc_addr, |
| 468 | /* Sign-extend the 24-bit addend in the |
| 469 | instruction (which counts instructions), and |
| 470 | then shift it up two so as to count bytes. */ |
| 471 | (((Elf32_Sword) *reloc_addr << 8) >> 8) << 2); |
| 472 | break; |
| 473 | #if !defined RTLD_BOOTSTRAP |
| 474 | case R_ARM_TLS_DTPMOD32: |
| 475 | /* Get the information from the link map returned by the |
| 476 | resolv function. */ |
| 477 | if (sym_map != NULL) |
| 478 | *reloc_addr = sym_map->l_tls_modid; |
| 479 | break; |
| 480 | |
| 481 | case R_ARM_TLS_DTPOFF32: |
| 482 | if (sym != NULL) |
| 483 | *reloc_addr += sym->st_value; |
| 484 | break; |
| 485 | |
| 486 | case R_ARM_TLS_TPOFF32: |
| 487 | if (sym != NULL) |
| 488 | { |
| 489 | CHECK_STATIC_TLS (map, sym_map); |
| 490 | *reloc_addr += sym->st_value + sym_map->l_tls_offset; |
| 491 | } |
| 492 | break; |
| 493 | case R_ARM_IRELATIVE: |
| 494 | value = map->l_addr + *reloc_addr; |
| 495 | if (__glibc_likely (!skip_ifunc)) |
| 496 | value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); |
| 497 | *reloc_addr = value; |
| 498 | break; |
| 499 | #endif |
| 500 | default: |
| 501 | _dl_reloc_bad_type (map, r_type, 0); |
| 502 | break; |
| 503 | } |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | # ifndef RTLD_BOOTSTRAP |
| 508 | static inline void |
| 509 | __attribute__ ((always_inline)) |
| 510 | elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[], |
| 511 | const Elf32_Rela *reloc, const Elf32_Sym *sym, |
| 512 | const struct r_found_version *version, |
| 513 | void *const reloc_addr_arg, int skip_ifunc) |
| 514 | { |
| 515 | Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| 516 | const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| 517 | |
| 518 | if (__builtin_expect (r_type == R_ARM_RELATIVE, 0)) |
| 519 | *reloc_addr = map->l_addr + reloc->r_addend; |
| 520 | else if (__builtin_expect (r_type == R_ARM_NONE, 0)) |
| 521 | return; |
| 522 | else |
| 523 | { |
| 524 | # ifndef RESOLVE_CONFLICT_FIND_MAP |
| 525 | const Elf32_Sym *const refsym = sym; |
| 526 | # endif |
| 527 | struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, r_type); |
| 528 | Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true); |
| 529 | |
| 530 | if (sym != NULL |
| 531 | && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) |
| 532 | && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) |
| 533 | && __builtin_expect (!skip_ifunc, 1)) |
| 534 | value = elf_ifunc_invoke (value); |
| 535 | |
| 536 | switch (r_type) |
| 537 | { |
| 538 | # ifndef RESOLVE_CONFLICT_FIND_MAP |
| 539 | /* Not needed for dl-conflict.c. */ |
| 540 | case R_ARM_COPY: |
| 541 | if (sym == NULL) |
| 542 | /* This can happen in trace mode if an object could not be |
| 543 | found. */ |
| 544 | break; |
| 545 | if (sym->st_size > refsym->st_size |
| 546 | || (GLRO(dl_verbose) && sym->st_size < refsym->st_size)) |
| 547 | { |
| 548 | const char *strtab; |
| 549 | |
| 550 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
| 551 | _dl_error_printf ("\ |
| 552 | %s: Symbol `%s' has different size in shared object, consider re-linking\n", |
| 553 | RTLD_PROGNAME, strtab + refsym->st_name); |
| 554 | } |
| 555 | memcpy (reloc_addr_arg, (void *) value, |
| 556 | MIN (sym->st_size, refsym->st_size)); |
| 557 | break; |
| 558 | # endif /* !RESOLVE_CONFLICT_FIND_MAP */ |
| 559 | case R_ARM_GLOB_DAT: |
| 560 | case R_ARM_JUMP_SLOT: |
| 561 | case R_ARM_ABS32: |
| 562 | *reloc_addr = value + reloc->r_addend; |
| 563 | break; |
| 564 | case R_ARM_PC24: |
| 565 | relocate_pc24 (map, value, reloc_addr, reloc->r_addend); |
| 566 | break; |
| 567 | #if !defined RTLD_BOOTSTRAP |
| 568 | case R_ARM_TLS_DTPMOD32: |
| 569 | /* Get the information from the link map returned by the |
| 570 | resolv function. */ |
| 571 | if (sym_map != NULL) |
| 572 | *reloc_addr = sym_map->l_tls_modid; |
| 573 | break; |
| 574 | |
| 575 | case R_ARM_TLS_DTPOFF32: |
| 576 | *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend; |
| 577 | break; |
| 578 | |
| 579 | case R_ARM_TLS_TPOFF32: |
| 580 | if (sym != NULL) |
| 581 | { |
| 582 | CHECK_STATIC_TLS (map, sym_map); |
| 583 | *reloc_addr = (sym->st_value + sym_map->l_tls_offset |
| 584 | + reloc->r_addend); |
| 585 | } |
| 586 | break; |
| 587 | case R_ARM_IRELATIVE: |
| 588 | value = map->l_addr + reloc->r_addend; |
| 589 | if (__glibc_likely (!skip_ifunc)) |
| 590 | value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); |
| 591 | *reloc_addr = value; |
| 592 | break; |
| 593 | #endif |
| 594 | default: |
| 595 | _dl_reloc_bad_type (map, r_type, 0); |
| 596 | break; |
| 597 | } |
| 598 | } |
| 599 | } |
| 600 | # endif |
| 601 | |
| 602 | static inline void |
| 603 | __attribute__ ((always_inline)) |
| 604 | elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc, |
| 605 | void *const reloc_addr_arg) |
| 606 | { |
| 607 | Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| 608 | *reloc_addr += l_addr; |
| 609 | } |
| 610 | |
| 611 | # ifndef RTLD_BOOTSTRAP |
| 612 | static inline void |
| 613 | __attribute__ ((always_inline)) |
| 614 | elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| 615 | void *const reloc_addr_arg) |
| 616 | { |
| 617 | Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| 618 | *reloc_addr = l_addr + reloc->r_addend; |
| 619 | } |
| 620 | # endif |
| 621 | |
| 622 | static inline void |
| 623 | __attribute__ ((always_inline)) |
| 624 | elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[], |
| 625 | Elf32_Addr l_addr, const Elf32_Rel *reloc, |
| 626 | int skip_ifunc) |
| 627 | { |
| 628 | Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); |
| 629 | const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| 630 | /* Check for unexpected PLT reloc type. */ |
| 631 | if (__builtin_expect (r_type == R_ARM_JUMP_SLOT, 1)) |
| 632 | { |
| 633 | if (__builtin_expect (map->l_mach.plt, 0) == 0) |
| 634 | *reloc_addr += l_addr; |
| 635 | else |
| 636 | *reloc_addr = map->l_mach.plt; |
| 637 | } |
| 638 | else if (__builtin_expect (r_type == R_ARM_TLS_DESC, 1)) |
| 639 | { |
| 640 | const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info); |
| 641 | const ElfW (Sym) *symtab = (const void *)D_PTR (map, l_info[DT_SYMTAB]); |
| 642 | const ElfW (Sym) *sym = &symtab[symndx]; |
| 643 | const struct r_found_version *version = NULL; |
| 644 | |
| 645 | if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL) |
| 646 | { |
| 647 | const ElfW (Half) *vernum = |
| 648 | (const void *)D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); |
| 649 | version = &map->l_versions[vernum[symndx] & 0x7fff]; |
| 650 | } |
| 651 | |
| 652 | /* Always initialize TLS descriptors completely, because lazy |
| 653 | initialization requires synchronization at every TLS access. */ |
| 654 | elf_machine_rel (map, scope, reloc, sym, version, reloc_addr, skip_ifunc); |
| 655 | } |
| 656 | else |
| 657 | _dl_reloc_bad_type (map, r_type, 1); |
| 658 | } |
| 659 | |
| 660 | #endif /* RESOLVE_MAP */ |
| 661 |
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