1/* Ubicom IP2xxx specific support for 32-bit ELF 2 Copyright (C) 2000-2024 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "libbfd.h" 24#include "elf-bfd.h" 25#include "elf/ip2k.h" 26 27/* Struct used to pass miscellaneous paramaters which 28 helps to avoid overly long parameter lists. */ 29struct misc 30{ 31 Elf_Internal_Shdr * symtab_hdr; 32 Elf_Internal_Rela * irelbase; 33 bfd_byte * contents; 34 Elf_Internal_Sym * isymbuf; 35}; 36 37struct ip2k_opcode 38{ 39 unsigned short opcode; 40 unsigned short mask; 41}; 42 43static bool ip2k_relaxed = false; 44 45static const struct ip2k_opcode ip2k_page_opcode[] = 46{ 47 {0x0010, 0xFFF8}, /* Page. */ 48 {0x0000, 0x0000}, 49}; 50 51#define IS_PAGE_OPCODE(code) \ 52 ip2k_is_opcode (code, ip2k_page_opcode) 53 54static const struct ip2k_opcode ip2k_jmp_opcode[] = 55{ 56 {0xE000, 0xE000}, /* Jmp. */ 57 {0x0000, 0x0000}, 58}; 59 60#define IS_JMP_OPCODE(code) \ 61 ip2k_is_opcode (code, ip2k_jmp_opcode) 62 63static const struct ip2k_opcode ip2k_snc_opcode[] = 64{ 65 {0xA00B, 0xFFFF}, /* Snc. */ 66 {0x0000, 0x0000}, 67}; 68 69#define IS_SNC_OPCODE(code) \ 70 ip2k_is_opcode (code, ip2k_snc_opcode) 71 72static const struct ip2k_opcode ip2k_inc_1sp_opcode[] = 73{ 74 {0x2B81, 0xFFFF}, /* Inc 1(SP). */ 75 {0x0000, 0x0000}, 76}; 77 78#define IS_INC_1SP_OPCODE(code) \ 79 ip2k_is_opcode (code, ip2k_inc_1sp_opcode) 80 81static const struct ip2k_opcode ip2k_add_2sp_w_opcode[] = 82{ 83 {0x1F82, 0xFFFF}, /* Add 2(SP),w. */ 84 {0x0000, 0x0000}, 85}; 86 87#define IS_ADD_2SP_W_OPCODE(code) \ 88 ip2k_is_opcode (code, ip2k_add_2sp_w_opcode) 89 90static const struct ip2k_opcode ip2k_add_w_wreg_opcode[] = 91{ 92 {0x1C0A, 0xFFFF}, /* Add w,wreg. */ 93 {0x1E0A, 0xFFFF}, /* Add wreg,w. */ 94 {0x0000, 0x0000}, 95}; 96 97#define IS_ADD_W_WREG_OPCODE(code) \ 98 ip2k_is_opcode (code, ip2k_add_w_wreg_opcode) 99 100static const struct ip2k_opcode ip2k_add_pcl_w_opcode[] = 101{ 102 {0x1E09, 0xFFFF}, /* Add pcl,w. */ 103 {0x0000, 0x0000}, 104}; 105 106#define IS_ADD_PCL_W_OPCODE(code) \ 107 ip2k_is_opcode (code, ip2k_add_pcl_w_opcode) 108 109static const struct ip2k_opcode ip2k_skip_opcodes[] = 110{ 111 {0xB000, 0xF000}, /* sb */ 112 {0xA000, 0xF000}, /* snb */ 113 {0x7600, 0xFE00}, /* cse/csne #lit */ 114 {0x5800, 0xFC00}, /* incsnz */ 115 {0x4C00, 0xFC00}, /* decsnz */ 116 {0x4000, 0xFC00}, /* cse/csne */ 117 {0x3C00, 0xFC00}, /* incsz */ 118 {0x2C00, 0xFC00}, /* decsz */ 119 {0x0000, 0x0000}, 120}; 121 122#define IS_SKIP_OPCODE(code) \ 123 ip2k_is_opcode (code, ip2k_skip_opcodes) 124 125/* Relocation tables. */ 126static reloc_howto_type ip2k_elf_howto_table [] = 127{ 128#define IP2K_HOWTO(t,rs,s,bs,pr,bp,name,sm,dm) \ 129 HOWTO(t, /* type */ \ 130 rs, /* rightshift */ \ 131 s, /* size (0 = byte, 1 = short, 2 = long) */ \ 132 bs, /* bitsize */ \ 133 pr, /* pc_relative */ \ 134 bp, /* bitpos */ \ 135 complain_overflow_dont,/* complain_on_overflow */ \ 136 bfd_elf_generic_reloc,/* special_function */ \ 137 name, /* name */ \ 138 false, /* partial_inplace */ \ 139 sm, /* src_mask */ \ 140 dm, /* dst_mask */ \ 141 pr) /* pcrel_offset */ 142 143 /* This reloc does nothing. */ 144 IP2K_HOWTO (R_IP2K_NONE, 0,0,0, false, 0, "R_IP2K_NONE", 0, 0), 145 /* A 16 bit absolute relocation. */ 146 IP2K_HOWTO (R_IP2K_16, 0,2,16, false, 0, "R_IP2K_16", 0, 0xffff), 147 /* A 32 bit absolute relocation. */ 148 IP2K_HOWTO (R_IP2K_32, 0,4,32, false, 0, "R_IP2K_32", 0, 0xffffffff), 149 /* A 8-bit data relocation for the FR9 field. Ninth bit is computed specially. */ 150 IP2K_HOWTO (R_IP2K_FR9, 0,2,9, false, 0, "R_IP2K_FR9", 0, 0x00ff), 151 /* A 4-bit data relocation. */ 152 IP2K_HOWTO (R_IP2K_BANK, 8,2,4, false, 0, "R_IP2K_BANK", 0, 0x000f), 153 /* A 13-bit insn relocation - word address => right-shift 1 bit extra. */ 154 IP2K_HOWTO (R_IP2K_ADDR16CJP, 1,2,13, false, 0, "R_IP2K_ADDR16CJP", 0, 0x1fff), 155 /* A 3-bit insn relocation - word address => right-shift 1 bit extra. */ 156 IP2K_HOWTO (R_IP2K_PAGE3, 14,2,3, false, 0, "R_IP2K_PAGE3", 0, 0x0007), 157 /* Two 8-bit data relocations. */ 158 IP2K_HOWTO (R_IP2K_LO8DATA, 0,2,8, false, 0, "R_IP2K_LO8DATA", 0, 0x00ff), 159 IP2K_HOWTO (R_IP2K_HI8DATA, 8,2,8, false, 0, "R_IP2K_HI8DATA", 0, 0x00ff), 160 /* Two 8-bit insn relocations. word address => right-shift 1 bit extra. */ 161 IP2K_HOWTO (R_IP2K_LO8INSN, 1,2,8, false, 0, "R_IP2K_LO8INSN", 0, 0x00ff), 162 IP2K_HOWTO (R_IP2K_HI8INSN, 9,2,8, false, 0, "R_IP2K_HI8INSN", 0, 0x00ff), 163 164 /* Special 1 bit relocation for SKIP instructions. */ 165 IP2K_HOWTO (R_IP2K_PC_SKIP, 1,2,1, false, 12, "R_IP2K_PC_SKIP", 0xfffe, 0x1000), 166 /* 16 bit word address. */ 167 IP2K_HOWTO (R_IP2K_TEXT, 1,2,16, false, 0, "R_IP2K_TEXT", 0, 0xffff), 168 /* A 7-bit offset relocation for the FR9 field. Eigth and ninth bit comes from insn. */ 169 IP2K_HOWTO (R_IP2K_FR_OFFSET, 0,2,9, false, 0, "R_IP2K_FR_OFFSET", 0x180, 0x007f), 170 /* Bits 23:16 of an address. */ 171 IP2K_HOWTO (R_IP2K_EX8DATA, 16,2,8, false, 0, "R_IP2K_EX8DATA", 0, 0x00ff), 172}; 173 174 175/* Map BFD reloc types to IP2K ELF reloc types. */ 176 177static reloc_howto_type * 178ip2k_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 179 bfd_reloc_code_real_type code) 180{ 181 /* Note that the ip2k_elf_howto_table is indxed by the R_ 182 constants. Thus, the order that the howto records appear in the 183 table *must* match the order of the relocation types defined in 184 include/elf/ip2k.h. */ 185 186 switch (code) 187 { 188 case BFD_RELOC_NONE: 189 return &ip2k_elf_howto_table[ (int) R_IP2K_NONE]; 190 case BFD_RELOC_16: 191 return &ip2k_elf_howto_table[ (int) R_IP2K_16]; 192 case BFD_RELOC_32: 193 return &ip2k_elf_howto_table[ (int) R_IP2K_32]; 194 case BFD_RELOC_IP2K_FR9: 195 return &ip2k_elf_howto_table[ (int) R_IP2K_FR9]; 196 case BFD_RELOC_IP2K_BANK: 197 return &ip2k_elf_howto_table[ (int) R_IP2K_BANK]; 198 case BFD_RELOC_IP2K_ADDR16CJP: 199 return &ip2k_elf_howto_table[ (int) R_IP2K_ADDR16CJP]; 200 case BFD_RELOC_IP2K_PAGE3: 201 return &ip2k_elf_howto_table[ (int) R_IP2K_PAGE3]; 202 case BFD_RELOC_IP2K_LO8DATA: 203 return &ip2k_elf_howto_table[ (int) R_IP2K_LO8DATA]; 204 case BFD_RELOC_IP2K_HI8DATA: 205 return &ip2k_elf_howto_table[ (int) R_IP2K_HI8DATA]; 206 case BFD_RELOC_IP2K_LO8INSN: 207 return &ip2k_elf_howto_table[ (int) R_IP2K_LO8INSN]; 208 case BFD_RELOC_IP2K_HI8INSN: 209 return &ip2k_elf_howto_table[ (int) R_IP2K_HI8INSN]; 210 case BFD_RELOC_IP2K_PC_SKIP: 211 return &ip2k_elf_howto_table[ (int) R_IP2K_PC_SKIP]; 212 case BFD_RELOC_IP2K_TEXT: 213 return &ip2k_elf_howto_table[ (int) R_IP2K_TEXT]; 214 case BFD_RELOC_IP2K_FR_OFFSET: 215 return &ip2k_elf_howto_table[ (int) R_IP2K_FR_OFFSET]; 216 case BFD_RELOC_IP2K_EX8DATA: 217 return &ip2k_elf_howto_table[ (int) R_IP2K_EX8DATA]; 218 default: 219 /* Pacify gcc -Wall. */ 220 return NULL; 221 } 222 return NULL; 223} 224 225static reloc_howto_type * 226ip2k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) 227{ 228 unsigned int i; 229 230 for (i = 0; 231 i < sizeof (ip2k_elf_howto_table) / sizeof (ip2k_elf_howto_table[0]); 232 i++) 233 if (ip2k_elf_howto_table[i].name != NULL 234 && strcasecmp (ip2k_elf_howto_table[i].name, r_name) == 0) 235 return &ip2k_elf_howto_table[i]; 236 237 return NULL; 238} 239 240static void 241ip2k_get_mem (bfd *abfd ATTRIBUTE_UNUSED, 242 bfd_byte *addr, 243 int length, 244 bfd_byte *ptr) 245{ 246 while (length --) 247 * ptr ++ = bfd_get_8 (abfd, addr ++); 248} 249 250static bool 251ip2k_is_opcode (bfd_byte *code, const struct ip2k_opcode *opcodes) 252{ 253 unsigned short insn = (code[0] << 8) | code[1]; 254 255 while (opcodes->mask != 0) 256 { 257 if ((insn & opcodes->mask) == opcodes->opcode) 258 return true; 259 260 opcodes ++; 261 } 262 263 return false; 264} 265 266#define PAGENO(ABSADDR) ((ABSADDR) & 0xFFFFC000) 267#define BASEADDR(SEC) ((SEC)->output_section->vma + (SEC)->output_offset) 268 269#define UNDEFINED_SYMBOL (~(bfd_vma)0) 270 271/* Return the value of the symbol associated with the relocation IREL. */ 272 273static bfd_vma 274symbol_value (bfd *abfd, 275 Elf_Internal_Shdr *symtab_hdr, 276 Elf_Internal_Sym *isymbuf, 277 Elf_Internal_Rela *irel) 278{ 279 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 280 { 281 Elf_Internal_Sym *isym; 282 asection *sym_sec; 283 284 isym = isymbuf + ELF32_R_SYM (irel->r_info); 285 if (isym->st_shndx == SHN_UNDEF) 286 sym_sec = bfd_und_section_ptr; 287 else if (isym->st_shndx == SHN_ABS) 288 sym_sec = bfd_abs_section_ptr; 289 else if (isym->st_shndx == SHN_COMMON) 290 sym_sec = bfd_com_section_ptr; 291 else 292 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 293 294 return isym->st_value + BASEADDR (sym_sec); 295 } 296 else 297 { 298 unsigned long indx; 299 struct elf_link_hash_entry *h; 300 301 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 302 h = elf_sym_hashes (abfd)[indx]; 303 BFD_ASSERT (h != NULL); 304 305 if (h->root.type != bfd_link_hash_defined 306 && h->root.type != bfd_link_hash_defweak) 307 return UNDEFINED_SYMBOL; 308 309 return (h->root.u.def.value + BASEADDR (h->root.u.def.section)); 310 } 311} 312 313/* Determine if the instruction sequence matches that for 314 the prologue of a switch dispatch table with fewer than 315 128 entries. 316 317 sc 318 page $nnn0 319 jmp $nnn0 320 add w,wreg 321 add pcl,w 322 addr=> 323 page $nnn1 324 jmp $nnn1 325 page $nnn2 326 jmp $nnn2 327 ... 328 page $nnnN 329 jmp $nnnN 330 331 After relaxation. 332 sc 333 page $nnn0 334 jmp $nnn0 335 add pcl,w 336 addr=> 337 jmp $nnn1 338 jmp $nnn2 339 ... 340 jmp $nnnN */ 341 342static int 343ip2k_is_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, 344 asection *sec, 345 bfd_vma addr, 346 bfd_byte *contents) 347{ 348 bfd_byte code[4]; 349 int table_index = 0; 350 351 /* Check current page-jmp. */ 352 if (addr + 4 > sec->size) 353 return -1; 354 355 ip2k_get_mem (abfd, contents + addr, 4, code); 356 357 if ((! IS_PAGE_OPCODE (code + 0)) 358 || (! IS_JMP_OPCODE (code + 2))) 359 return -1; 360 361 /* Search back. */ 362 while (1) 363 { 364 if (addr < 4) 365 return -1; 366 367 /* Check previous 2 instructions. */ 368 ip2k_get_mem (abfd, contents + addr - 4, 4, code); 369 if ((IS_ADD_W_WREG_OPCODE (code + 0)) 370 && (IS_ADD_PCL_W_OPCODE (code + 2))) 371 return table_index; 372 373 if ((! IS_PAGE_OPCODE (code + 0)) 374 || (! IS_JMP_OPCODE (code + 2))) 375 return -1; 376 377 table_index++; 378 addr -= 4; 379 } 380} 381 382/* Determine if the instruction sequence matches that for 383 the prologue switch dispatch table with fewer than 384 256 entries but more than 127. 385 386 Before relaxation. 387 push %lo8insn(label) ; Push address of table 388 push %hi8insn(label) 389 add w,wreg ; index*2 => offset 390 snc ; CARRY SET? 391 inc 1(sp) ; Propagate MSB into table address 392 add 2(sp),w ; Add low bits of offset to table address 393 snc ; and handle any carry-out 394 inc 1(sp) 395 addr=> 396 page __indjmp ; Do an indirect jump to that location 397 jmp __indjmp 398 label: ; case dispatch table starts here 399 page $nnn1 400 jmp $nnn1 401 page $nnn2 402 jmp $nnn2 403 ... 404 page $nnnN 405 jmp $nnnN 406 407 After relaxation. 408 push %lo8insn(label) ; Push address of table 409 push %hi8insn(label) 410 add 2(sp),w ; Add low bits of offset to table address 411 snc ; and handle any carry-out 412 inc 1(sp) 413 addr=> 414 page __indjmp ; Do an indirect jump to that location 415 jmp __indjmp 416 label: ; case dispatch table starts here 417 jmp $nnn1 418 jmp $nnn2 419 ... 420 jmp $nnnN */ 421 422static int 423ip2k_is_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, 424 asection *sec, 425 bfd_vma addr, 426 bfd_byte *contents) 427{ 428 bfd_byte code[16]; 429 int table_index = 0; 430 431 /* Check current page-jmp. */ 432 if (addr + 4 > sec->size) 433 return -1; 434 435 ip2k_get_mem (abfd, contents + addr, 4, code); 436 if ((! IS_PAGE_OPCODE (code + 0)) 437 || (! IS_JMP_OPCODE (code + 2))) 438 return -1; 439 440 /* Search back. */ 441 while (1) 442 { 443 if (addr < 16) 444 return -1; 445 446 /* Check previous 8 instructions. */ 447 ip2k_get_mem (abfd, contents + addr - 16, 16, code); 448 if ((IS_ADD_W_WREG_OPCODE (code + 0)) 449 && (IS_SNC_OPCODE (code + 2)) 450 && (IS_INC_1SP_OPCODE (code + 4)) 451 && (IS_ADD_2SP_W_OPCODE (code + 6)) 452 && (IS_SNC_OPCODE (code + 8)) 453 && (IS_INC_1SP_OPCODE (code + 10)) 454 && (IS_PAGE_OPCODE (code + 12)) 455 && (IS_JMP_OPCODE (code + 14))) 456 return table_index; 457 458 if ((IS_ADD_W_WREG_OPCODE (code + 2)) 459 && (IS_SNC_OPCODE (code + 4)) 460 && (IS_INC_1SP_OPCODE (code + 6)) 461 && (IS_ADD_2SP_W_OPCODE (code + 8)) 462 && (IS_SNC_OPCODE (code + 10)) 463 && (IS_INC_1SP_OPCODE (code + 12)) 464 && (IS_JMP_OPCODE (code + 14))) 465 return table_index; 466 467 if ((! IS_PAGE_OPCODE (code + 0)) 468 || (! IS_JMP_OPCODE (code + 2))) 469 return -1; 470 471 table_index++; 472 addr -= 4; 473 } 474} 475 476/* Returns the expected page state for the given instruction not including 477 the effect of page instructions. */ 478 479static bfd_vma 480ip2k_nominal_page_bits (bfd *abfd ATTRIBUTE_UNUSED, 481 asection *sec, 482 bfd_vma addr, 483 bfd_byte *contents) 484{ 485 bfd_vma page = PAGENO (BASEADDR (sec) + addr); 486 487 /* Check if section flows into this page. If not then the page 488 bits are assumed to match the PC. This will be true unless 489 the user has a page instruction without a call/jump, in which 490 case they are on their own. */ 491 if (PAGENO (BASEADDR (sec)) == page) 492 return page; 493 494 /* Section flows across page boundary. The page bits should match 495 the PC unless there is a possible flow from the previous page, 496 in which case it is not possible to determine the value of the 497 page bits. */ 498 while (PAGENO (BASEADDR (sec) + addr - 2) == page) 499 { 500 bfd_byte code[2]; 501 502 addr -= 2; 503 ip2k_get_mem (abfd, contents + addr, 2, code); 504 if (!IS_PAGE_OPCODE (code)) 505 continue; 506 507 /* Found a page instruction, check if jump table. */ 508 if (ip2k_is_switch_table_128 (abfd, sec, addr, contents) != -1) 509 /* Jump table => page is conditional. */ 510 continue; 511 512 if (ip2k_is_switch_table_256 (abfd, sec, addr, contents) != -1) 513 /* Jump table => page is conditional. */ 514 continue; 515 516 /* Found a page instruction, check if conditional. */ 517 if (addr >= 2) 518 { 519 ip2k_get_mem (abfd, contents + addr - 2, 2, code); 520 if (IS_SKIP_OPCODE (code)) 521 /* Page is conditional. */ 522 continue; 523 } 524 525 /* Unconditional page instruction => page bits should be correct. */ 526 return page; 527 } 528 529 /* Flow from previous page => page bits are impossible to determine. */ 530 return 0; 531} 532 533static bool 534ip2k_test_page_insn (bfd *abfd ATTRIBUTE_UNUSED, 535 asection *sec, 536 Elf_Internal_Rela *irel, 537 struct misc *misc) 538{ 539 bfd_vma symval; 540 541 /* Get the value of the symbol referred to by the reloc. */ 542 symval = symbol_value (abfd, misc->symtab_hdr, misc->isymbuf, irel); 543 if (symval == UNDEFINED_SYMBOL) 544 /* This appears to be a reference to an undefined 545 symbol. Just ignore it--it will be caught by the 546 regular reloc processing. */ 547 return false; 548 549 /* Test if we can delete this page instruction. */ 550 if (PAGENO (symval + irel->r_addend) != 551 ip2k_nominal_page_bits (abfd, sec, irel->r_offset, misc->contents)) 552 return false; 553 554 return true; 555} 556 557/* Parts of a Stabs entry. */ 558 559#define STRDXOFF 0 560#define TYPEOFF 4 561#define OTHEROFF 5 562#define DESCOFF 6 563#define VALOFF 8 564#define STABSIZE 12 565 566/* Adjust all the relocations entries after adding or inserting instructions. */ 567 568static void 569adjust_all_relocations (bfd *abfd, 570 asection *sec, 571 bfd_vma addr, 572 bfd_vma endaddr, 573 int count, 574 int noadj) 575{ 576 Elf_Internal_Shdr *symtab_hdr; 577 Elf_Internal_Sym *isymbuf, *isym, *isymend; 578 unsigned int shndx; 579 Elf_Internal_Rela *irel, *irelend, *irelbase; 580 struct elf_link_hash_entry **sym_hashes; 581 struct elf_link_hash_entry **end_hashes; 582 unsigned int symcount; 583 asection *stab; 584 585 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 586 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 587 588 shndx = _bfd_elf_section_from_bfd_section (abfd, sec); 589 590 irelbase = elf_section_data (sec)->relocs; 591 irelend = irelbase + sec->reloc_count; 592 593 for (irel = irelbase; irel < irelend; irel++) 594 { 595 if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE) 596 { 597 /* Get the value of the symbol referred to by the reloc. */ 598 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 599 { 600 asection *sym_sec; 601 602 /* A local symbol. */ 603 isym = isymbuf + ELF32_R_SYM (irel->r_info); 604 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 605 606 if (isym->st_shndx == shndx) 607 { 608 bfd_vma baseaddr = BASEADDR (sec); 609 bfd_vma symval = BASEADDR (sym_sec) + isym->st_value 610 + irel->r_addend; 611 612 if ((baseaddr + addr + noadj) <= symval 613 && symval < (baseaddr + endaddr)) 614 irel->r_addend += count; 615 } 616 } 617 } 618 619 /* Do this only for PC space relocations. */ 620 if (addr <= irel->r_offset && irel->r_offset < endaddr) 621 irel->r_offset += count; 622 } 623 624 /* Now fix the stab relocations. */ 625 stab = bfd_get_section_by_name (abfd, ".stab"); 626 if (stab && stab->reloc_count != 0) 627 { 628 bfd_byte *stabcontents, *stabend, *stabp; 629 bfd_size_type stab_size = stab->rawsize ? stab->rawsize : stab->size; 630 631 irelbase = elf_section_data (stab)->relocs; 632 irelend = irelbase + stab->reloc_count; 633 634 /* Pull out the contents of the stab section. */ 635 if (elf_section_data (stab)->this_hdr.contents != NULL) 636 stabcontents = elf_section_data (stab)->this_hdr.contents; 637 else 638 { 639 if (!bfd_malloc_and_get_section (abfd, stab, &stabcontents)) 640 { 641 free (stabcontents); 642 return; 643 } 644 645 /* We need to remember this. */ 646 elf_section_data (stab)->this_hdr.contents = stabcontents; 647 } 648 649 stabend = stabcontents + stab_size; 650 651 for (irel = irelbase; irel < irelend; irel++) 652 { 653 if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE) 654 { 655 /* Get the value of the symbol referred to by the reloc. */ 656 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 657 { 658 asection *sym_sec; 659 660 /* A local symbol. */ 661 isym = isymbuf + ELF32_R_SYM (irel->r_info); 662 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 663 664 if (sym_sec == sec) 665 { 666 const char *name; 667 unsigned char type; 668 bfd_vma value; 669 bfd_vma baseaddr = BASEADDR (sec); 670 bfd_vma symval = BASEADDR (sym_sec) + isym->st_value 671 + irel->r_addend; 672 673 if ((baseaddr + addr) <= symval 674 && symval <= (baseaddr + endaddr)) 675 irel->r_addend += count; 676 677 /* Go hunt up a function and fix its line info if needed. */ 678 stabp = stabcontents + irel->r_offset - 8; 679 680 /* Go pullout the stab entry. */ 681 type = bfd_h_get_8 (abfd, stabp + TYPEOFF); 682 value = bfd_h_get_32 (abfd, stabp + VALOFF); 683 684 name = bfd_get_stab_name (type); 685 686 if (strcmp (name, "FUN") == 0) 687 { 688 int function_adjusted = 0; 689 690 if (symval > (baseaddr + addr)) 691 /* Not in this function. */ 692 continue; 693 694 /* Hey we got a function hit. */ 695 stabp += STABSIZE; 696 for (;stabp < stabend; stabp += STABSIZE) 697 { 698 /* Go pullout the stab entry. */ 699 type = bfd_h_get_8 (abfd, stabp + TYPEOFF); 700 value = bfd_h_get_32 (abfd, stabp + VALOFF); 701 702 name = bfd_get_stab_name (type); 703 704 if (strcmp (name, "FUN") == 0) 705 { 706 /* Hit another function entry. */ 707 if (function_adjusted) 708 { 709 /* Adjust the value. */ 710 value += count; 711 712 /* We need to put it back. */ 713 bfd_h_put_32 (abfd, value,stabp + VALOFF); 714 } 715 716 /* And then bale out. */ 717 break; 718 } 719 720 if (strcmp (name, "SLINE") == 0) 721 { 722 /* Got a line entry. */ 723 if ((baseaddr + addr) <= (symval + value)) 724 { 725 /* Adjust the line entry. */ 726 value += count; 727 728 /* We need to put it back. */ 729 bfd_h_put_32 (abfd, value,stabp + VALOFF); 730 function_adjusted = 1; 731 } 732 } 733 } 734 } 735 } 736 } 737 } 738 } 739 } 740 741 /* When adding an instruction back it is sometimes necessary to move any 742 global or local symbol that was referencing the first instruction of 743 the moved block to refer to the first instruction of the inserted block. 744 745 For example adding a PAGE instruction before a CALL or JMP requires 746 that any label on the CALL or JMP is moved to the PAGE insn. */ 747 addr += noadj; 748 749 /* Adjust the local symbols defined in this section. */ 750 isymend = isymbuf + symtab_hdr->sh_info; 751 for (isym = isymbuf; isym < isymend; isym++) 752 { 753 if (isym->st_shndx == shndx 754 && addr <= isym->st_value 755 && isym->st_value < endaddr) 756 isym->st_value += count; 757 } 758 759 /* Now adjust the global symbols defined in this section. */ 760 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) 761 - symtab_hdr->sh_info); 762 sym_hashes = elf_sym_hashes (abfd); 763 end_hashes = sym_hashes + symcount; 764 for (; sym_hashes < end_hashes; sym_hashes++) 765 { 766 struct elf_link_hash_entry *sym_hash = *sym_hashes; 767 768 if ((sym_hash->root.type == bfd_link_hash_defined 769 || sym_hash->root.type == bfd_link_hash_defweak) 770 && sym_hash->root.u.def.section == sec) 771 { 772 if (addr <= sym_hash->root.u.def.value 773 && sym_hash->root.u.def.value < endaddr) 774 sym_hash->root.u.def.value += count; 775 } 776 } 777 778 return; 779} 780 781/* Delete some bytes from a section while relaxing. */ 782 783static bool 784ip2k_elf_relax_delete_bytes (bfd *abfd, 785 asection *sec, 786 bfd_vma addr, 787 int count) 788{ 789 bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; 790 bfd_vma endaddr = sec->size; 791 792 /* Actually delete the bytes. */ 793 memmove (contents + addr, contents + addr + count, 794 endaddr - addr - count); 795 796 sec->size -= count; 797 798 adjust_all_relocations (abfd, sec, addr + count, endaddr, -count, 0); 799 return true; 800} 801 802static bool 803ip2k_delete_page_insn (bfd *abfd ATTRIBUTE_UNUSED, 804 asection *sec, 805 Elf_Internal_Rela *irel, 806 bool *again, 807 struct misc *misc) 808{ 809 /* Note that we've changed the relocs, section contents, etc. */ 810 elf_section_data (sec)->relocs = misc->irelbase; 811 elf_section_data (sec)->this_hdr.contents = misc->contents; 812 misc->symtab_hdr->contents = (bfd_byte *) misc->isymbuf; 813 814 /* Fix the relocation's type. */ 815 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_IP2K_NONE); 816 817 /* Delete the PAGE insn. */ 818 if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 2)) 819 return false; 820 821 /* Modified => will need to iterate relaxation again. */ 822 *again = true; 823 824 return true; 825} 826 827static bool 828ip2k_relax_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, 829 asection *sec, 830 Elf_Internal_Rela *irel, 831 bool *again, 832 struct misc *misc) 833{ 834 Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; 835 Elf_Internal_Rela *ireltest = irel; 836 bfd_byte code[4]; 837 bfd_vma addr; 838 839 /* Test all page instructions. */ 840 addr = irel->r_offset; 841 while (1) 842 { 843 if (addr + 4 > sec->size) 844 break; 845 846 ip2k_get_mem (abfd, misc->contents + addr, 4, code); 847 if ((! IS_PAGE_OPCODE (code + 0)) 848 || (! IS_JMP_OPCODE (code + 2))) 849 break; 850 851 /* Validate relocation entry (every entry should have a matching 852 relocation entry). */ 853 if (ireltest >= irelend) 854 { 855 _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); 856 return false; 857 } 858 859 if (ireltest->r_offset != addr) 860 { 861 _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); 862 return false; 863 } 864 865 if (! ip2k_test_page_insn (abfd, sec, ireltest, misc)) 866 /* Un-removable page insn => nothing can be done. */ 867 return true; 868 869 addr += 4; 870 ireltest += 2; 871 } 872 873 /* Relaxable. Adjust table header. */ 874 ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 4, code); 875 if ((! IS_ADD_W_WREG_OPCODE (code + 0)) 876 || (! IS_ADD_PCL_W_OPCODE (code + 2))) 877 { 878 _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); 879 return false; 880 } 881 882 if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset - 4, 2)) 883 return false; 884 885 *again = true; 886 887 /* Delete all page instructions in table. */ 888 while (irel < ireltest) 889 { 890 if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) 891 return false; 892 irel += 2; 893 } 894 895 return true; 896} 897 898static bool 899ip2k_relax_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, 900 asection *sec, 901 Elf_Internal_Rela *irel, 902 bool *again, 903 struct misc *misc) 904{ 905 Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; 906 Elf_Internal_Rela *ireltest = irel; 907 bfd_byte code[12]; 908 bfd_vma addr; 909 910 /* Test all page instructions. */ 911 addr = irel->r_offset; 912 913 while (1) 914 { 915 if (addr + 4 > sec->size) 916 break; 917 918 ip2k_get_mem (abfd, misc->contents + addr, 4, code); 919 920 if ((! IS_PAGE_OPCODE (code + 0)) 921 || (! IS_JMP_OPCODE (code + 2))) 922 break; 923 924 /* Validate relocation entry (every entry should have a matching 925 relocation entry). */ 926 if (ireltest >= irelend) 927 { 928 _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); 929 return false; 930 } 931 932 if (ireltest->r_offset != addr) 933 { 934 _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); 935 return false; 936 } 937 938 if (!ip2k_test_page_insn (abfd, sec, ireltest, misc)) 939 /* Un-removable page insn => nothing can be done. */ 940 return true; 941 942 addr += 4; 943 ireltest += 2; 944 } 945 946 /* Relaxable. Adjust table header. */ 947 ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 2, code); 948 if (IS_PAGE_OPCODE (code)) 949 addr = irel->r_offset - 16; 950 else 951 addr = irel->r_offset - 14; 952 953 ip2k_get_mem (abfd, misc->contents + addr, 12, code); 954 if ((!IS_ADD_W_WREG_OPCODE (code + 0)) 955 || (!IS_SNC_OPCODE (code + 2)) 956 || (!IS_INC_1SP_OPCODE (code + 4)) 957 || (!IS_ADD_2SP_W_OPCODE (code + 6)) 958 || (!IS_SNC_OPCODE (code + 8)) 959 || (!IS_INC_1SP_OPCODE (code + 10))) 960 { 961 _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); 962 return false; 963 } 964 965 /* Delete first 3 opcodes. */ 966 if (!ip2k_elf_relax_delete_bytes (abfd, sec, addr + 0, 6)) 967 return false; 968 969 *again = true; 970 971 /* Delete all page instructions in table. */ 972 while (irel < ireltest) 973 { 974 if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) 975 return false; 976 irel += 2; 977 } 978 979 return true; 980} 981 982/* This function handles relaxation of a section in a specific page. */ 983 984static bool 985ip2k_elf_relax_section_page (bfd *abfd, 986 asection *sec, 987 bool *again, 988 struct misc *misc, 989 unsigned long page_start, 990 unsigned long page_end) 991{ 992 Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; 993 Elf_Internal_Rela *irel; 994 int switch_table_128; 995 int switch_table_256; 996 997 /* Walk thru the section looking for relaxation opportunities. */ 998 for (irel = misc->irelbase; irel < irelend; irel++) 999 { 1000 if (ELF32_R_TYPE (irel->r_info) != (int) R_IP2K_PAGE3) 1001 /* Ignore non page instructions. */ 1002 continue; 1003 1004 if (BASEADDR (sec) + irel->r_offset < page_start) 1005 /* Ignore page instructions on earlier page - they have 1006 already been processed. Remember that there is code flow 1007 that crosses a page boundary. */ 1008 continue; 1009 1010 if (BASEADDR (sec) + irel->r_offset > page_end) 1011 /* Flow beyond end of page => nothing more to do for this page. */ 1012 return true; 1013 1014 /* Detect switch tables. */ 1015 switch_table_128 = ip2k_is_switch_table_128 (abfd, sec, irel->r_offset, misc->contents); 1016 switch_table_256 = ip2k_is_switch_table_256 (abfd, sec, irel->r_offset, misc->contents); 1017 1018 if ((switch_table_128 > 0) || (switch_table_256 > 0)) 1019 /* If the index is greater than 0 then it has already been processed. */ 1020 continue; 1021 1022 if (switch_table_128 == 0) 1023 { 1024 if (!ip2k_relax_switch_table_128 (abfd, sec, irel, again, misc)) 1025 return false; 1026 1027 continue; 1028 } 1029 1030 if (switch_table_256 == 0) 1031 { 1032 if (!ip2k_relax_switch_table_256 (abfd, sec, irel, again, misc)) 1033 return false; 1034 1035 continue; 1036 } 1037 1038 /* Simple relax. */ 1039 if (ip2k_test_page_insn (abfd, sec, irel, misc)) 1040 { 1041 if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) 1042 return false; 1043 1044 continue; 1045 } 1046 } 1047 1048 return true; 1049} 1050 1051/* This function handles relaxing for the ip2k. 1052 1053 Principle: Start with the first page and remove page instructions that 1054 are not require on this first page. By removing page instructions more 1055 code will fit into this page - repeat until nothing more can be achieved 1056 for this page. Move on to the next page. 1057 1058 Processing the pages one at a time from the lowest page allows a removal 1059 only policy to be used - pages can be removed but are never reinserted. */ 1060 1061static bool 1062ip2k_elf_relax_section (bfd *abfd, 1063 asection *sec, 1064 struct bfd_link_info *link_info, 1065 bool *again) 1066{ 1067 Elf_Internal_Shdr *symtab_hdr; 1068 Elf_Internal_Rela *internal_relocs; 1069 bfd_byte *contents = NULL; 1070 Elf_Internal_Sym *isymbuf = NULL; 1071 static asection * first_section = NULL; 1072 static unsigned long search_addr; 1073 static unsigned long page_start = 0; 1074 static unsigned long page_end = 0; 1075 static unsigned int pass = 0; 1076 static bool new_pass = false; 1077 static bool changed = false; 1078 struct misc misc; 1079 1080 /* Assume nothing changes. */ 1081 *again = false; 1082 1083 if (first_section == NULL) 1084 { 1085 ip2k_relaxed = true; 1086 first_section = sec; 1087 } 1088 1089 if (first_section == sec) 1090 { 1091 pass++; 1092 new_pass = true; 1093 } 1094 1095 /* We don't have to do anything for a relocatable link, 1096 if this section does not have relocs, or if this is 1097 not a code section. */ 1098 if (bfd_link_relocatable (link_info) 1099 || sec->reloc_count == 0 1100 || (sec->flags & SEC_RELOC) == 0 1101 || (sec->flags & SEC_HAS_CONTENTS) == 0 1102 || (sec->flags & SEC_CODE) == 0) 1103 return true; 1104 1105 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1106 1107 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, 1108 link_info->keep_memory); 1109 if (internal_relocs == NULL) 1110 goto error_return; 1111 1112 /* Get section contents cached copy if it exists. */ 1113 if (contents == NULL) 1114 { 1115 /* Get cached copy if it exists. */ 1116 if (elf_section_data (sec)->this_hdr.contents != NULL) 1117 contents = elf_section_data (sec)->this_hdr.contents; 1118 else 1119 { 1120 /* Go get them off disk. */ 1121 if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1122 goto error_return; 1123 } 1124 } 1125 1126 /* Read this BFD's symbols cached copy if it exists. */ 1127 if (isymbuf == NULL && symtab_hdr->sh_info != 0) 1128 { 1129 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1130 if (isymbuf == NULL) 1131 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 1132 symtab_hdr->sh_info, 0, 1133 NULL, NULL, NULL); 1134 if (isymbuf == NULL) 1135 goto error_return; 1136 } 1137 1138 misc.symtab_hdr = symtab_hdr; 1139 misc.isymbuf = isymbuf; 1140 misc.irelbase = internal_relocs; 1141 misc.contents = contents; 1142 1143 /* This is where all the relaxation actually get done. */ 1144 if ((pass == 1) || (new_pass && !changed)) 1145 { 1146 /* On the first pass we simply search for the lowest page that 1147 we havn't relaxed yet. Note that the pass count is reset 1148 each time a page is complete in order to move on to the next page. 1149 If we can't find any more pages then we are finished. */ 1150 if (new_pass) 1151 { 1152 pass = 1; 1153 new_pass = false; 1154 changed = true; /* Pre-initialize to break out of pass 1. */ 1155 search_addr = 0xFFFFFFFF; 1156 } 1157 1158 if ((BASEADDR (sec) + sec->size < search_addr) 1159 && (BASEADDR (sec) + sec->size > page_end)) 1160 { 1161 if (BASEADDR (sec) <= page_end) 1162 search_addr = page_end + 1; 1163 else 1164 search_addr = BASEADDR (sec); 1165 1166 /* Found a page => more work to do. */ 1167 *again = true; 1168 } 1169 } 1170 else 1171 { 1172 if (new_pass) 1173 { 1174 new_pass = false; 1175 changed = false; 1176 page_start = PAGENO (search_addr); 1177 page_end = page_start | 0x00003FFF; 1178 } 1179 1180 /* Only process sections in range. */ 1181 if ((BASEADDR (sec) + sec->size >= page_start) 1182 && (BASEADDR (sec) <= page_end)) 1183 { 1184 if (!ip2k_elf_relax_section_page (abfd, sec, &changed, &misc, page_start, page_end)) 1185 return false; 1186 } 1187 *again = true; 1188 } 1189 1190 /* Perform some house keeping after relaxing the section. */ 1191 1192 if (isymbuf != NULL 1193 && symtab_hdr->contents != (unsigned char *) isymbuf) 1194 { 1195 if (! link_info->keep_memory) 1196 free (isymbuf); 1197 else 1198 symtab_hdr->contents = (unsigned char *) isymbuf; 1199 } 1200 1201 if (contents != NULL 1202 && elf_section_data (sec)->this_hdr.contents != contents) 1203 { 1204 if (! link_info->keep_memory) 1205 free (contents); 1206 else 1207 { 1208 /* Cache the section contents for elf_link_input_bfd. */ 1209 elf_section_data (sec)->this_hdr.contents = contents; 1210 } 1211 } 1212 1213 if (elf_section_data (sec)->relocs != internal_relocs) 1214 free (internal_relocs); 1215 1216 return true; 1217 1218 error_return: 1219 if (symtab_hdr->contents != (unsigned char *) isymbuf) 1220 free (isymbuf); 1221 if (elf_section_data (sec)->this_hdr.contents != contents) 1222 free (contents); 1223 if (elf_section_data (sec)->relocs != internal_relocs) 1224 free (internal_relocs); 1225 return false; 1226} 1227 1228/* Set the howto pointer for a IP2K ELF reloc. */ 1229 1230static bool 1231ip2k_info_to_howto_rela (bfd * abfd, 1232 arelent * cache_ptr, 1233 Elf_Internal_Rela * dst) 1234{ 1235 unsigned int r_type; 1236 1237 r_type = ELF32_R_TYPE (dst->r_info); 1238 if (r_type >= (unsigned int) R_IP2K_max) 1239 { 1240 /* xgettext:c-format */ 1241 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 1242 abfd, r_type); 1243 bfd_set_error (bfd_error_bad_value); 1244 return false; 1245 } 1246 cache_ptr->howto = & ip2k_elf_howto_table [r_type]; 1247 return true; 1248} 1249 1250/* Perform a single relocation. 1251 By default we use the standard BFD routines. */ 1252 1253static bfd_reloc_status_type 1254ip2k_final_link_relocate (reloc_howto_type * howto, 1255 bfd * input_bfd, 1256 asection * input_section, 1257 bfd_byte * contents, 1258 Elf_Internal_Rela * rel, 1259 bfd_vma relocation) 1260{ 1261 static bfd_vma page_addr = 0; 1262 1263 bfd_reloc_status_type r = bfd_reloc_ok; 1264 switch (howto->type) 1265 { 1266 /* Handle data space relocations. */ 1267 case R_IP2K_FR9: 1268 case R_IP2K_BANK: 1269 if ((relocation & IP2K_DATA_MASK) == IP2K_DATA_VALUE) 1270 relocation &= ~IP2K_DATA_MASK; 1271 else 1272 r = bfd_reloc_notsupported; 1273 break; 1274 1275 case R_IP2K_LO8DATA: 1276 case R_IP2K_HI8DATA: 1277 case R_IP2K_EX8DATA: 1278 break; 1279 1280 /* Handle insn space relocations. */ 1281 case R_IP2K_PAGE3: 1282 page_addr = BASEADDR (input_section) + rel->r_offset; 1283 if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) 1284 relocation &= ~IP2K_INSN_MASK; 1285 else 1286 r = bfd_reloc_notsupported; 1287 break; 1288 1289 case R_IP2K_ADDR16CJP: 1290 if (BASEADDR (input_section) + rel->r_offset != page_addr + 2) 1291 { 1292 /* No preceding page instruction, verify that it isn't needed. */ 1293 if (PAGENO (relocation + rel->r_addend) != 1294 ip2k_nominal_page_bits (input_bfd, input_section, 1295 rel->r_offset, contents)) 1296 /* xgettext:c-format */ 1297 _bfd_error_handler 1298 (_("ip2k linker: missing page instruction " 1299 "at %#" PRIx64 " (dest = %#" PRIx64 ")"), 1300 (uint64_t) (BASEADDR (input_section) + rel->r_offset), 1301 (uint64_t) (relocation + rel->r_addend)); 1302 } 1303 else if (ip2k_relaxed) 1304 { 1305 /* Preceding page instruction. Verify that the page instruction is 1306 really needed. One reason for the relaxation to miss a page is if 1307 the section is not marked as executable. */ 1308 if (!ip2k_is_switch_table_128 (input_bfd, input_section, 1309 rel->r_offset - 2, contents) 1310 && !ip2k_is_switch_table_256 (input_bfd, input_section, 1311 rel->r_offset - 2, contents) 1312 && (PAGENO (relocation + rel->r_addend) == 1313 ip2k_nominal_page_bits (input_bfd, input_section, 1314 rel->r_offset - 2, contents))) 1315 /* xgettext:c-format */ 1316 _bfd_error_handler 1317 (_("ip2k linker: redundant page instruction " 1318 "at %#" PRIx64 " (dest = %#" PRIx64 ")"), 1319 (uint64_t) page_addr, 1320 (uint64_t) (relocation + rel->r_addend)); 1321 } 1322 if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) 1323 relocation &= ~IP2K_INSN_MASK; 1324 else 1325 r = bfd_reloc_notsupported; 1326 break; 1327 1328 case R_IP2K_LO8INSN: 1329 case R_IP2K_HI8INSN: 1330 case R_IP2K_PC_SKIP: 1331 if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) 1332 relocation &= ~IP2K_INSN_MASK; 1333 else 1334 r = bfd_reloc_notsupported; 1335 break; 1336 1337 case R_IP2K_16: 1338 /* If this is a relocation involving a TEXT 1339 symbol, reduce it to a word address. */ 1340 if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) 1341 howto = &ip2k_elf_howto_table[ (int) R_IP2K_TEXT]; 1342 break; 1343 1344 /* Pass others through. */ 1345 default: 1346 break; 1347 } 1348 1349 /* Only install relocation if above tests did not disqualify it. */ 1350 if (r == bfd_reloc_ok) 1351 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1352 contents, rel->r_offset, 1353 relocation, rel->r_addend); 1354 1355 return r; 1356} 1357 1358/* Relocate a IP2K ELF section. 1359 1360 The RELOCATE_SECTION function is called by the new ELF backend linker 1361 to handle the relocations for a section. 1362 1363 The relocs are always passed as Rela structures; if the section 1364 actually uses Rel structures, the r_addend field will always be 1365 zero. 1366 1367 This function is responsible for adjusting the section contents as 1368 necessary, and (if using Rela relocs and generating a relocatable 1369 output file) adjusting the reloc addend as necessary. 1370 1371 This function does not have to worry about setting the reloc 1372 address or the reloc symbol index. 1373 1374 LOCAL_SYMS is a pointer to the swapped in local symbols. 1375 1376 LOCAL_SECTIONS is an array giving the section in the input file 1377 corresponding to the st_shndx field of each local symbol. 1378 1379 The global hash table entry for the global symbols can be found 1380 via elf_sym_hashes (input_bfd). 1381 1382 When generating relocatable output, this function must handle 1383 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 1384 going to be the section symbol corresponding to the output 1385 section, which means that the addend must be adjusted 1386 accordingly. */ 1387 1388static int 1389ip2k_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1390 struct bfd_link_info *info, 1391 bfd *input_bfd, 1392 asection *input_section, 1393 bfd_byte *contents, 1394 Elf_Internal_Rela *relocs, 1395 Elf_Internal_Sym *local_syms, 1396 asection **local_sections) 1397{ 1398 Elf_Internal_Shdr *symtab_hdr; 1399 struct elf_link_hash_entry **sym_hashes; 1400 Elf_Internal_Rela *rel; 1401 Elf_Internal_Rela *relend; 1402 1403 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 1404 sym_hashes = elf_sym_hashes (input_bfd); 1405 relend = relocs + input_section->reloc_count; 1406 1407 for (rel = relocs; rel < relend; rel ++) 1408 { 1409 reloc_howto_type * howto; 1410 unsigned long r_symndx; 1411 Elf_Internal_Sym * sym; 1412 asection * sec; 1413 struct elf_link_hash_entry * h; 1414 bfd_vma relocation; 1415 bfd_reloc_status_type r; 1416 const char * name = NULL; 1417 int r_type; 1418 1419 r_type = ELF32_R_TYPE (rel->r_info); 1420 r_symndx = ELF32_R_SYM (rel->r_info); 1421 howto = ip2k_elf_howto_table + r_type; 1422 h = NULL; 1423 sym = NULL; 1424 sec = NULL; 1425 1426 if (r_symndx < symtab_hdr->sh_info) 1427 { 1428 sym = local_syms + r_symndx; 1429 sec = local_sections [r_symndx]; 1430 relocation = BASEADDR (sec) + sym->st_value; 1431 1432 name = bfd_elf_string_from_elf_section 1433 (input_bfd, symtab_hdr->sh_link, sym->st_name); 1434 name = name == NULL ? bfd_section_name (sec) : name; 1435 } 1436 else 1437 { 1438 bool warned, ignored; 1439 bool unresolved_reloc; 1440 1441 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1442 r_symndx, symtab_hdr, sym_hashes, 1443 h, sec, relocation, 1444 unresolved_reloc, warned, ignored); 1445 1446 name = h->root.root.string; 1447 } 1448 1449 if (sec != NULL && discarded_section (sec)) 1450 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1451 rel, 1, relend, howto, 0, contents); 1452 1453 if (bfd_link_relocatable (info)) 1454 continue; 1455 1456 /* Finally, the sole IP2K-specific part. */ 1457 r = ip2k_final_link_relocate (howto, input_bfd, input_section, 1458 contents, rel, relocation); 1459 1460 if (r != bfd_reloc_ok) 1461 { 1462 const char * msg = NULL; 1463 1464 switch (r) 1465 { 1466 case bfd_reloc_overflow: 1467 (*info->callbacks->reloc_overflow) 1468 (info, (h ? &h->root : NULL), name, howto->name, 1469 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1470 break; 1471 1472 case bfd_reloc_undefined: 1473 (*info->callbacks->undefined_symbol) 1474 (info, name, input_bfd, input_section, rel->r_offset, true); 1475 break; 1476 1477 case bfd_reloc_outofrange: 1478 msg = _("internal error: out of range error"); 1479 break; 1480 1481 /* This is how ip2k_final_link_relocate tells us of a non-kosher 1482 reference between insn & data address spaces. */ 1483 case bfd_reloc_notsupported: 1484 if (sym != NULL) /* Only if it's not an unresolved symbol. */ 1485 msg = _("unsupported relocation between data/insn address spaces"); 1486 break; 1487 1488 case bfd_reloc_dangerous: 1489 msg = _("internal error: dangerous relocation"); 1490 break; 1491 1492 default: 1493 msg = _("internal error: unknown error"); 1494 break; 1495 } 1496 1497 if (msg) 1498 (*info->callbacks->warning) (info, msg, name, input_bfd, 1499 input_section, rel->r_offset); 1500 } 1501 } 1502 1503 return true; 1504} 1505 1506#define TARGET_BIG_SYM ip2k_elf32_vec 1507#define TARGET_BIG_NAME "elf32-ip2k" 1508 1509#define ELF_ARCH bfd_arch_ip2k 1510#define ELF_MACHINE_CODE EM_IP2K 1511#define ELF_MACHINE_ALT1 EM_IP2K_OLD 1512#define ELF_MAXPAGESIZE 1 /* No pages on the IP2K. */ 1513 1514#define elf_info_to_howto_rel NULL 1515#define elf_info_to_howto ip2k_info_to_howto_rela 1516 1517#define elf_backend_can_gc_sections 1 1518#define elf_backend_rela_normal 1 1519#define elf_backend_relocate_section ip2k_elf_relocate_section 1520 1521#define elf_symbol_leading_char '_' 1522#define bfd_elf32_bfd_reloc_type_lookup ip2k_reloc_type_lookup 1523#define bfd_elf32_bfd_reloc_name_lookup ip2k_reloc_name_lookup 1524#define bfd_elf32_bfd_relax_section ip2k_elf_relax_section 1525 1526#include "elf32-target.h" 1527