| 1 | /* Ubicom IP2xxx specific support for 32-bit ELF |
| 2 | Copyright (C) 2000-2020 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. */ |
| 29 | struct misc |
| 30 | { |
| 31 | Elf_Internal_Shdr * symtab_hdr; |
| 32 | Elf_Internal_Rela * irelbase; |
| 33 | bfd_byte * contents; |
| 34 | Elf_Internal_Sym * isymbuf; |
| 35 | }; |
| 36 | |
| 37 | struct ip2k_opcode |
| 38 | { |
| 39 | unsigned short opcode; |
| 40 | unsigned short mask; |
| 41 | }; |
| 42 | |
| 43 | static bfd_boolean ip2k_relaxed = FALSE; |
| 44 | |
| 45 | static 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 | |
| 54 | static 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 | |
| 63 | static 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 | |
| 72 | static 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 | |
| 81 | static 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 | |
| 90 | static 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 | |
| 100 | static 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 | |
| 109 | static 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. */ |
| 126 | static 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, 0,3,0, FALSE, 0, "R_IP2K_NONE", 0, 0), |
| 145 | /* A 16 bit absolute relocation. */ |
| 146 | IP2K_HOWTO (R_IP2K_16, 0,1,16, FALSE, 0, "R_IP2K_16", 0, 0xffff), |
| 147 | /* A 32 bit absolute relocation. */ |
| 148 | IP2K_HOWTO (R_IP2K_32, 0,2,32, 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, 0,1,9, FALSE, 0, "R_IP2K_FR9", 0, 0x00ff), |
| 151 | /* A 4-bit data relocation. */ |
| 152 | IP2K_HOWTO (R_IP2K_BANK, 8,1,4, 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, 1,1,13, 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, 14,1,3, FALSE, 0, "R_IP2K_PAGE3", 0, 0x0007), |
| 157 | /* Two 8-bit data relocations. */ |
| 158 | IP2K_HOWTO (R_IP2K_LO8DATA, 0,1,8, FALSE, 0, "R_IP2K_LO8DATA", 0, 0x00ff), |
| 159 | IP2K_HOWTO (R_IP2K_HI8DATA, 8,1,8, 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, 1,1,8, FALSE, 0, "R_IP2K_LO8INSN", 0, 0x00ff), |
| 162 | IP2K_HOWTO (R_IP2K_HI8INSN, 9,1,8, FALSE, 0, "R_IP2K_HI8INSN", 0, 0x00ff), |
| 163 | |
| 164 | /* Special 1 bit relocation for SKIP instructions. */ |
| 165 | IP2K_HOWTO (R_IP2K_PC_SKIP, 1,1,1, FALSE, 12, "R_IP2K_PC_SKIP", 0xfffe, 0x1000), |
| 166 | /* 16 bit word address. */ |
| 167 | IP2K_HOWTO (R_IP2K_TEXT, 1,1,16, 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, 0,1,9, FALSE, 0, "R_IP2K_FR_OFFSET", 0x180, 0x007f), |
| 170 | /* Bits 23:16 of an address. */ |
| 171 | IP2K_HOWTO (R_IP2K_EX8DATA, 16,1,8, FALSE, 0, "R_IP2K_EX8DATA", 0, 0x00ff), |
| 172 | }; |
| 173 | |
| 174 | |
| 175 | /* Map BFD reloc types to IP2K ELF reloc types. */ |
| 176 | |
| 177 | static reloc_howto_type * |
| 178 | ip2k_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 | |
| 225 | static reloc_howto_type * |
| 226 | ip2k_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 | |
| 240 | static void |
| 241 | ip2k_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 | |
| 250 | static bfd_boolean |
| 251 | ip2k_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 | |
| 273 | static bfd_vma |
| 274 | symbol_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 | |
| 342 | static int |
| 343 | ip2k_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 | |
| 422 | static int |
| 423 | ip2k_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 | |
| 479 | static bfd_vma |
| 480 | ip2k_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 | |
| 533 | static bfd_boolean |
| 534 | ip2k_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 | |
| 568 | static void |
| 569 | adjust_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) |
| 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 | if (stabcontents != NULL) |
| 642 | free (stabcontents); |
| 643 | return; |
| 644 | } |
| 645 | |
| 646 | /* We need to remember this. */ |
| 647 | elf_section_data (stab)->this_hdr.contents = stabcontents; |
| 648 | } |
| 649 | |
| 650 | stabend = stabcontents + stab_size; |
| 651 | |
| 652 | for (irel = irelbase; irel < irelend; irel++) |
| 653 | { |
| 654 | if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE) |
| 655 | { |
| 656 | /* Get the value of the symbol referred to by the reloc. */ |
| 657 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 658 | { |
| 659 | asection *sym_sec; |
| 660 | |
| 661 | /* A local symbol. */ |
| 662 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 663 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 664 | |
| 665 | if (sym_sec == sec) |
| 666 | { |
| 667 | const char *name; |
| 668 | unsigned char type; |
| 669 | bfd_vma value; |
| 670 | bfd_vma baseaddr = BASEADDR (sec); |
| 671 | bfd_vma symval = BASEADDR (sym_sec) + isym->st_value |
| 672 | + irel->r_addend; |
| 673 | |
| 674 | if ((baseaddr + addr) <= symval |
| 675 | && symval <= (baseaddr + endaddr)) |
| 676 | irel->r_addend += count; |
| 677 | |
| 678 | /* Go hunt up a function and fix its line info if needed. */ |
| 679 | stabp = stabcontents + irel->r_offset - 8; |
| 680 | |
| 681 | /* Go pullout the stab entry. */ |
| 682 | type = bfd_h_get_8 (abfd, stabp + TYPEOFF); |
| 683 | value = bfd_h_get_32 (abfd, stabp + VALOFF); |
| 684 | |
| 685 | name = bfd_get_stab_name (type); |
| 686 | |
| 687 | if (strcmp (name, "FUN") == 0) |
| 688 | { |
| 689 | int function_adjusted = 0; |
| 690 | |
| 691 | if (symval > (baseaddr + addr)) |
| 692 | /* Not in this function. */ |
| 693 | continue; |
| 694 | |
| 695 | /* Hey we got a function hit. */ |
| 696 | stabp += STABSIZE; |
| 697 | for (;stabp < stabend; stabp += STABSIZE) |
| 698 | { |
| 699 | /* Go pullout the stab entry. */ |
| 700 | type = bfd_h_get_8 (abfd, stabp + TYPEOFF); |
| 701 | value = bfd_h_get_32 (abfd, stabp + VALOFF); |
| 702 | |
| 703 | name = bfd_get_stab_name (type); |
| 704 | |
| 705 | if (strcmp (name, "FUN") == 0) |
| 706 | { |
| 707 | /* Hit another function entry. */ |
| 708 | if (function_adjusted) |
| 709 | { |
| 710 | /* Adjust the value. */ |
| 711 | value += count; |
| 712 | |
| 713 | /* We need to put it back. */ |
| 714 | bfd_h_put_32 (abfd, value,stabp + VALOFF); |
| 715 | } |
| 716 | |
| 717 | /* And then bale out. */ |
| 718 | break; |
| 719 | } |
| 720 | |
| 721 | if (strcmp (name, "SLINE") == 0) |
| 722 | { |
| 723 | /* Got a line entry. */ |
| 724 | if ((baseaddr + addr) <= (symval + value)) |
| 725 | { |
| 726 | /* Adjust the line entry. */ |
| 727 | value += count; |
| 728 | |
| 729 | /* We need to put it back. */ |
| 730 | bfd_h_put_32 (abfd, value,stabp + VALOFF); |
| 731 | function_adjusted = 1; |
| 732 | } |
| 733 | } |
| 734 | } |
| 735 | } |
| 736 | } |
| 737 | } |
| 738 | } |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | /* When adding an instruction back it is sometimes necessary to move any |
| 743 | global or local symbol that was referencing the first instruction of |
| 744 | the moved block to refer to the first instruction of the inserted block. |
| 745 | |
| 746 | For example adding a PAGE instruction before a CALL or JMP requires |
| 747 | that any label on the CALL or JMP is moved to the PAGE insn. */ |
| 748 | addr += noadj; |
| 749 | |
| 750 | /* Adjust the local symbols defined in this section. */ |
| 751 | isymend = isymbuf + symtab_hdr->sh_info; |
| 752 | for (isym = isymbuf; isym < isymend; isym++) |
| 753 | { |
| 754 | if (isym->st_shndx == shndx |
| 755 | && addr <= isym->st_value |
| 756 | && isym->st_value < endaddr) |
| 757 | isym->st_value += count; |
| 758 | } |
| 759 | |
| 760 | /* Now adjust the global symbols defined in this section. */ |
| 761 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 762 | - symtab_hdr->sh_info); |
| 763 | sym_hashes = elf_sym_hashes (abfd); |
| 764 | end_hashes = sym_hashes + symcount; |
| 765 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 766 | { |
| 767 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 768 | |
| 769 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 770 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 771 | && sym_hash->root.u.def.section == sec) |
| 772 | { |
| 773 | if (addr <= sym_hash->root.u.def.value |
| 774 | && sym_hash->root.u.def.value < endaddr) |
| 775 | sym_hash->root.u.def.value += count; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | /* Delete some bytes from a section while relaxing. */ |
| 783 | |
| 784 | static bfd_boolean |
| 785 | ip2k_elf_relax_delete_bytes (bfd *abfd, |
| 786 | asection *sec, |
| 787 | bfd_vma addr, |
| 788 | int count) |
| 789 | { |
| 790 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 791 | bfd_vma endaddr = sec->size; |
| 792 | |
| 793 | /* Actually delete the bytes. */ |
| 794 | memmove (contents + addr, contents + addr + count, |
| 795 | endaddr - addr - count); |
| 796 | |
| 797 | sec->size -= count; |
| 798 | |
| 799 | adjust_all_relocations (abfd, sec, addr + count, endaddr, -count, 0); |
| 800 | return TRUE; |
| 801 | } |
| 802 | |
| 803 | static bfd_boolean |
| 804 | ip2k_delete_page_insn (bfd *abfd ATTRIBUTE_UNUSED, |
| 805 | asection *sec, |
| 806 | Elf_Internal_Rela *irel, |
| 807 | bfd_boolean *again, |
| 808 | struct misc *misc) |
| 809 | { |
| 810 | /* Note that we've changed the relocs, section contents, etc. */ |
| 811 | elf_section_data (sec)->relocs = misc->irelbase; |
| 812 | elf_section_data (sec)->this_hdr.contents = misc->contents; |
| 813 | misc->symtab_hdr->contents = (bfd_byte *) misc->isymbuf; |
| 814 | |
| 815 | /* Fix the relocation's type. */ |
| 816 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_IP2K_NONE); |
| 817 | |
| 818 | /* Delete the PAGE insn. */ |
| 819 | if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 2)) |
| 820 | return FALSE; |
| 821 | |
| 822 | /* Modified => will need to iterate relaxation again. */ |
| 823 | *again = TRUE; |
| 824 | |
| 825 | return TRUE; |
| 826 | } |
| 827 | |
| 828 | static bfd_boolean |
| 829 | ip2k_relax_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, |
| 830 | asection *sec, |
| 831 | Elf_Internal_Rela *irel, |
| 832 | bfd_boolean *again, |
| 833 | struct misc *misc) |
| 834 | { |
| 835 | Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| 836 | Elf_Internal_Rela *ireltest = irel; |
| 837 | bfd_byte code[4]; |
| 838 | bfd_vma addr; |
| 839 | |
| 840 | /* Test all page instructions. */ |
| 841 | addr = irel->r_offset; |
| 842 | while (1) |
| 843 | { |
| 844 | if (addr + 4 > sec->size) |
| 845 | break; |
| 846 | |
| 847 | ip2k_get_mem (abfd, misc->contents + addr, 4, code); |
| 848 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 849 | || (! IS_JMP_OPCODE (code + 2))) |
| 850 | break; |
| 851 | |
| 852 | /* Validate relocation entry (every entry should have a matching |
| 853 | relocation entry). */ |
| 854 | if (ireltest >= irelend) |
| 855 | { |
| 856 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 857 | return FALSE; |
| 858 | } |
| 859 | |
| 860 | if (ireltest->r_offset != addr) |
| 861 | { |
| 862 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 863 | return FALSE; |
| 864 | } |
| 865 | |
| 866 | if (! ip2k_test_page_insn (abfd, sec, ireltest, misc)) |
| 867 | /* Un-removable page insn => nothing can be done. */ |
| 868 | return TRUE; |
| 869 | |
| 870 | addr += 4; |
| 871 | ireltest += 2; |
| 872 | } |
| 873 | |
| 874 | /* Relaxable. Adjust table header. */ |
| 875 | ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 4, code); |
| 876 | if ((! IS_ADD_W_WREG_OPCODE (code + 0)) |
| 877 | || (! IS_ADD_PCL_W_OPCODE (code + 2))) |
| 878 | { |
| 879 | _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); |
| 880 | return FALSE; |
| 881 | } |
| 882 | |
| 883 | if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset - 4, 2)) |
| 884 | return FALSE; |
| 885 | |
| 886 | *again = TRUE; |
| 887 | |
| 888 | /* Delete all page instructions in table. */ |
| 889 | while (irel < ireltest) |
| 890 | { |
| 891 | if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| 892 | return FALSE; |
| 893 | irel += 2; |
| 894 | } |
| 895 | |
| 896 | return TRUE; |
| 897 | } |
| 898 | |
| 899 | static bfd_boolean |
| 900 | ip2k_relax_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, |
| 901 | asection *sec, |
| 902 | Elf_Internal_Rela *irel, |
| 903 | bfd_boolean *again, |
| 904 | struct misc *misc) |
| 905 | { |
| 906 | Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| 907 | Elf_Internal_Rela *ireltest = irel; |
| 908 | bfd_byte code[12]; |
| 909 | bfd_vma addr; |
| 910 | |
| 911 | /* Test all page instructions. */ |
| 912 | addr = irel->r_offset; |
| 913 | |
| 914 | while (1) |
| 915 | { |
| 916 | if (addr + 4 > sec->size) |
| 917 | break; |
| 918 | |
| 919 | ip2k_get_mem (abfd, misc->contents + addr, 4, code); |
| 920 | |
| 921 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 922 | || (! IS_JMP_OPCODE (code + 2))) |
| 923 | break; |
| 924 | |
| 925 | /* Validate relocation entry (every entry should have a matching |
| 926 | relocation entry). */ |
| 927 | if (ireltest >= irelend) |
| 928 | { |
| 929 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 930 | return FALSE; |
| 931 | } |
| 932 | |
| 933 | if (ireltest->r_offset != addr) |
| 934 | { |
| 935 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 936 | return FALSE; |
| 937 | } |
| 938 | |
| 939 | if (!ip2k_test_page_insn (abfd, sec, ireltest, misc)) |
| 940 | /* Un-removable page insn => nothing can be done. */ |
| 941 | return TRUE; |
| 942 | |
| 943 | addr += 4; |
| 944 | ireltest += 2; |
| 945 | } |
| 946 | |
| 947 | /* Relaxable. Adjust table header. */ |
| 948 | ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 2, code); |
| 949 | if (IS_PAGE_OPCODE (code)) |
| 950 | addr = irel->r_offset - 16; |
| 951 | else |
| 952 | addr = irel->r_offset - 14; |
| 953 | |
| 954 | ip2k_get_mem (abfd, misc->contents + addr, 12, code); |
| 955 | if ((!IS_ADD_W_WREG_OPCODE (code + 0)) |
| 956 | || (!IS_SNC_OPCODE (code + 2)) |
| 957 | || (!IS_INC_1SP_OPCODE (code + 4)) |
| 958 | || (!IS_ADD_2SP_W_OPCODE (code + 6)) |
| 959 | || (!IS_SNC_OPCODE (code + 8)) |
| 960 | || (!IS_INC_1SP_OPCODE (code + 10))) |
| 961 | { |
| 962 | _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); |
| 963 | return FALSE; |
| 964 | } |
| 965 | |
| 966 | /* Delete first 3 opcodes. */ |
| 967 | if (!ip2k_elf_relax_delete_bytes (abfd, sec, addr + 0, 6)) |
| 968 | return FALSE; |
| 969 | |
| 970 | *again = TRUE; |
| 971 | |
| 972 | /* Delete all page instructions in table. */ |
| 973 | while (irel < ireltest) |
| 974 | { |
| 975 | if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| 976 | return FALSE; |
| 977 | irel += 2; |
| 978 | } |
| 979 | |
| 980 | return TRUE; |
| 981 | } |
| 982 | |
| 983 | /* This function handles relaxation of a section in a specific page. */ |
| 984 | |
| 985 | static bfd_boolean |
| 986 | ip2k_elf_relax_section_page (bfd *abfd, |
| 987 | asection *sec, |
| 988 | bfd_boolean *again, |
| 989 | struct misc *misc, |
| 990 | unsigned long page_start, |
| 991 | unsigned long page_end) |
| 992 | { |
| 993 | Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| 994 | Elf_Internal_Rela *irel; |
| 995 | int switch_table_128; |
| 996 | int switch_table_256; |
| 997 | |
| 998 | /* Walk thru the section looking for relaxation opportunities. */ |
| 999 | for (irel = misc->irelbase; irel < irelend; irel++) |
| 1000 | { |
| 1001 | if (ELF32_R_TYPE (irel->r_info) != (int) R_IP2K_PAGE3) |
| 1002 | /* Ignore non page instructions. */ |
| 1003 | continue; |
| 1004 | |
| 1005 | if (BASEADDR (sec) + irel->r_offset < page_start) |
| 1006 | /* Ignore page instructions on earlier page - they have |
| 1007 | already been processed. Remember that there is code flow |
| 1008 | that crosses a page boundary. */ |
| 1009 | continue; |
| 1010 | |
| 1011 | if (BASEADDR (sec) + irel->r_offset > page_end) |
| 1012 | /* Flow beyond end of page => nothing more to do for this page. */ |
| 1013 | return TRUE; |
| 1014 | |
| 1015 | /* Detect switch tables. */ |
| 1016 | switch_table_128 = ip2k_is_switch_table_128 (abfd, sec, irel->r_offset, misc->contents); |
| 1017 | switch_table_256 = ip2k_is_switch_table_256 (abfd, sec, irel->r_offset, misc->contents); |
| 1018 | |
| 1019 | if ((switch_table_128 > 0) || (switch_table_256 > 0)) |
| 1020 | /* If the index is greater than 0 then it has already been processed. */ |
| 1021 | continue; |
| 1022 | |
| 1023 | if (switch_table_128 == 0) |
| 1024 | { |
| 1025 | if (!ip2k_relax_switch_table_128 (abfd, sec, irel, again, misc)) |
| 1026 | return FALSE; |
| 1027 | |
| 1028 | continue; |
| 1029 | } |
| 1030 | |
| 1031 | if (switch_table_256 == 0) |
| 1032 | { |
| 1033 | if (!ip2k_relax_switch_table_256 (abfd, sec, irel, again, misc)) |
| 1034 | return FALSE; |
| 1035 | |
| 1036 | continue; |
| 1037 | } |
| 1038 | |
| 1039 | /* Simple relax. */ |
| 1040 | if (ip2k_test_page_insn (abfd, sec, irel, misc)) |
| 1041 | { |
| 1042 | if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| 1043 | return FALSE; |
| 1044 | |
| 1045 | continue; |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | return TRUE; |
| 1050 | } |
| 1051 | |
| 1052 | /* This function handles relaxing for the ip2k. |
| 1053 | |
| 1054 | Principle: Start with the first page and remove page instructions that |
| 1055 | are not require on this first page. By removing page instructions more |
| 1056 | code will fit into this page - repeat until nothing more can be achieved |
| 1057 | for this page. Move on to the next page. |
| 1058 | |
| 1059 | Processing the pages one at a time from the lowest page allows a removal |
| 1060 | only policy to be used - pages can be removed but are never reinserted. */ |
| 1061 | |
| 1062 | static bfd_boolean |
| 1063 | ip2k_elf_relax_section (bfd *abfd, |
| 1064 | asection *sec, |
| 1065 | struct bfd_link_info *link_info, |
| 1066 | bfd_boolean *again) |
| 1067 | { |
| 1068 | Elf_Internal_Shdr *symtab_hdr; |
| 1069 | Elf_Internal_Rela *internal_relocs; |
| 1070 | bfd_byte *contents = NULL; |
| 1071 | Elf_Internal_Sym *isymbuf = NULL; |
| 1072 | static asection * first_section = NULL; |
| 1073 | static unsigned long search_addr; |
| 1074 | static unsigned long page_start = 0; |
| 1075 | static unsigned long page_end = 0; |
| 1076 | static unsigned int pass = 0; |
| 1077 | static bfd_boolean new_pass = FALSE; |
| 1078 | static bfd_boolean changed = FALSE; |
| 1079 | struct misc misc; |
| 1080 | |
| 1081 | /* Assume nothing changes. */ |
| 1082 | *again = FALSE; |
| 1083 | |
| 1084 | if (first_section == NULL) |
| 1085 | { |
| 1086 | ip2k_relaxed = TRUE; |
| 1087 | first_section = sec; |
| 1088 | } |
| 1089 | |
| 1090 | if (first_section == sec) |
| 1091 | { |
| 1092 | pass++; |
| 1093 | new_pass = TRUE; |
| 1094 | } |
| 1095 | |
| 1096 | /* We don't have to do anything for a relocatable link, |
| 1097 | if this section does not have relocs, or if this is |
| 1098 | not a code section. */ |
| 1099 | if (bfd_link_relocatable (link_info) |
| 1100 | || (sec->flags & SEC_RELOC) == 0 |
| 1101 | || sec->reloc_count == 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 (internal_relocs != NULL |
| 1214 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1215 | free (internal_relocs); |
| 1216 | |
| 1217 | return TRUE; |
| 1218 | |
| 1219 | error_return: |
| 1220 | if (isymbuf != NULL |
| 1221 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1222 | free (isymbuf); |
| 1223 | if (contents != NULL |
| 1224 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1225 | free (contents); |
| 1226 | if (internal_relocs != NULL |
| 1227 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1228 | free (internal_relocs); |
| 1229 | return FALSE; |
| 1230 | } |
| 1231 | |
| 1232 | /* Set the howto pointer for a IP2K ELF reloc. */ |
| 1233 | |
| 1234 | static bfd_boolean |
| 1235 | ip2k_info_to_howto_rela (bfd * abfd, |
| 1236 | arelent * cache_ptr, |
| 1237 | Elf_Internal_Rela * dst) |
| 1238 | { |
| 1239 | unsigned int r_type; |
| 1240 | |
| 1241 | r_type = ELF32_R_TYPE (dst->r_info); |
| 1242 | if (r_type >= (unsigned int) R_IP2K_max) |
| 1243 | { |
| 1244 | /* xgettext:c-format */ |
| 1245 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 1246 | abfd, r_type); |
| 1247 | bfd_set_error (bfd_error_bad_value); |
| 1248 | return FALSE; |
| 1249 | } |
| 1250 | cache_ptr->howto = & ip2k_elf_howto_table [r_type]; |
| 1251 | return TRUE; |
| 1252 | } |
| 1253 | |
| 1254 | /* Perform a single relocation. |
| 1255 | By default we use the standard BFD routines. */ |
| 1256 | |
| 1257 | static bfd_reloc_status_type |
| 1258 | ip2k_final_link_relocate (reloc_howto_type * howto, |
| 1259 | bfd * input_bfd, |
| 1260 | asection * input_section, |
| 1261 | bfd_byte * contents, |
| 1262 | Elf_Internal_Rela * rel, |
| 1263 | bfd_vma relocation) |
| 1264 | { |
| 1265 | static bfd_vma page_addr = 0; |
| 1266 | |
| 1267 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 1268 | switch (howto->type) |
| 1269 | { |
| 1270 | /* Handle data space relocations. */ |
| 1271 | case R_IP2K_FR9: |
| 1272 | case R_IP2K_BANK: |
| 1273 | if ((relocation & IP2K_DATA_MASK) == IP2K_DATA_VALUE) |
| 1274 | relocation &= ~IP2K_DATA_MASK; |
| 1275 | else |
| 1276 | r = bfd_reloc_notsupported; |
| 1277 | break; |
| 1278 | |
| 1279 | case R_IP2K_LO8DATA: |
| 1280 | case R_IP2K_HI8DATA: |
| 1281 | case R_IP2K_EX8DATA: |
| 1282 | break; |
| 1283 | |
| 1284 | /* Handle insn space relocations. */ |
| 1285 | case R_IP2K_PAGE3: |
| 1286 | page_addr = BASEADDR (input_section) + rel->r_offset; |
| 1287 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1288 | relocation &= ~IP2K_INSN_MASK; |
| 1289 | else |
| 1290 | r = bfd_reloc_notsupported; |
| 1291 | break; |
| 1292 | |
| 1293 | case R_IP2K_ADDR16CJP: |
| 1294 | if (BASEADDR (input_section) + rel->r_offset != page_addr + 2) |
| 1295 | { |
| 1296 | /* No preceding page instruction, verify that it isn't needed. */ |
| 1297 | if (PAGENO (relocation + rel->r_addend) != |
| 1298 | ip2k_nominal_page_bits (input_bfd, input_section, |
| 1299 | rel->r_offset, contents)) |
| 1300 | /* xgettext:c-format */ |
| 1301 | _bfd_error_handler |
| 1302 | (_("ip2k linker: missing page instruction " |
| 1303 | "at %#" PRIx64 " (dest = %#" PRIx64 ")"), |
| 1304 | (uint64_t) (BASEADDR (input_section) + rel->r_offset), |
| 1305 | (uint64_t) (relocation + rel->r_addend)); |
| 1306 | } |
| 1307 | else if (ip2k_relaxed) |
| 1308 | { |
| 1309 | /* Preceding page instruction. Verify that the page instruction is |
| 1310 | really needed. One reason for the relaxation to miss a page is if |
| 1311 | the section is not marked as executable. */ |
| 1312 | if (!ip2k_is_switch_table_128 (input_bfd, input_section, |
| 1313 | rel->r_offset - 2, contents) |
| 1314 | && !ip2k_is_switch_table_256 (input_bfd, input_section, |
| 1315 | rel->r_offset - 2, contents) |
| 1316 | && (PAGENO (relocation + rel->r_addend) == |
| 1317 | ip2k_nominal_page_bits (input_bfd, input_section, |
| 1318 | rel->r_offset - 2, contents))) |
| 1319 | /* xgettext:c-format */ |
| 1320 | _bfd_error_handler |
| 1321 | (_("ip2k linker: redundant page instruction " |
| 1322 | "at %#" PRIx64 " (dest = %#" PRIx64 ")"), |
| 1323 | (uint64_t) page_addr, |
| 1324 | (uint64_t) (relocation + rel->r_addend)); |
| 1325 | } |
| 1326 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1327 | relocation &= ~IP2K_INSN_MASK; |
| 1328 | else |
| 1329 | r = bfd_reloc_notsupported; |
| 1330 | break; |
| 1331 | |
| 1332 | case R_IP2K_LO8INSN: |
| 1333 | case R_IP2K_HI8INSN: |
| 1334 | case R_IP2K_PC_SKIP: |
| 1335 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1336 | relocation &= ~IP2K_INSN_MASK; |
| 1337 | else |
| 1338 | r = bfd_reloc_notsupported; |
| 1339 | break; |
| 1340 | |
| 1341 | case R_IP2K_16: |
| 1342 | /* If this is a relocation involving a TEXT |
| 1343 | symbol, reduce it to a word address. */ |
| 1344 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1345 | howto = &ip2k_elf_howto_table[ (int) R_IP2K_TEXT]; |
| 1346 | break; |
| 1347 | |
| 1348 | /* Pass others through. */ |
| 1349 | default: |
| 1350 | break; |
| 1351 | } |
| 1352 | |
| 1353 | /* Only install relocation if above tests did not disqualify it. */ |
| 1354 | if (r == bfd_reloc_ok) |
| 1355 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1356 | contents, rel->r_offset, |
| 1357 | relocation, rel->r_addend); |
| 1358 | |
| 1359 | return r; |
| 1360 | } |
| 1361 | |
| 1362 | /* Relocate a IP2K ELF section. |
| 1363 | |
| 1364 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 1365 | to handle the relocations for a section. |
| 1366 | |
| 1367 | The relocs are always passed as Rela structures; if the section |
| 1368 | actually uses Rel structures, the r_addend field will always be |
| 1369 | zero. |
| 1370 | |
| 1371 | This function is responsible for adjusting the section contents as |
| 1372 | necessary, and (if using Rela relocs and generating a relocatable |
| 1373 | output file) adjusting the reloc addend as necessary. |
| 1374 | |
| 1375 | This function does not have to worry about setting the reloc |
| 1376 | address or the reloc symbol index. |
| 1377 | |
| 1378 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 1379 | |
| 1380 | LOCAL_SECTIONS is an array giving the section in the input file |
| 1381 | corresponding to the st_shndx field of each local symbol. |
| 1382 | |
| 1383 | The global hash table entry for the global symbols can be found |
| 1384 | via elf_sym_hashes (input_bfd). |
| 1385 | |
| 1386 | When generating relocatable output, this function must handle |
| 1387 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 1388 | going to be the section symbol corresponding to the output |
| 1389 | section, which means that the addend must be adjusted |
| 1390 | accordingly. */ |
| 1391 | |
| 1392 | static bfd_boolean |
| 1393 | ip2k_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1394 | struct bfd_link_info *info, |
| 1395 | bfd *input_bfd, |
| 1396 | asection *input_section, |
| 1397 | bfd_byte *contents, |
| 1398 | Elf_Internal_Rela *relocs, |
| 1399 | Elf_Internal_Sym *local_syms, |
| 1400 | asection **local_sections) |
| 1401 | { |
| 1402 | Elf_Internal_Shdr *symtab_hdr; |
| 1403 | struct elf_link_hash_entry **sym_hashes; |
| 1404 | Elf_Internal_Rela *rel; |
| 1405 | Elf_Internal_Rela *relend; |
| 1406 | |
| 1407 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1408 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1409 | relend = relocs + input_section->reloc_count; |
| 1410 | |
| 1411 | for (rel = relocs; rel < relend; rel ++) |
| 1412 | { |
| 1413 | reloc_howto_type * howto; |
| 1414 | unsigned long r_symndx; |
| 1415 | Elf_Internal_Sym * sym; |
| 1416 | asection * sec; |
| 1417 | struct elf_link_hash_entry * h; |
| 1418 | bfd_vma relocation; |
| 1419 | bfd_reloc_status_type r; |
| 1420 | const char * name = NULL; |
| 1421 | int r_type; |
| 1422 | |
| 1423 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1424 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1425 | howto = ip2k_elf_howto_table + r_type; |
| 1426 | h = NULL; |
| 1427 | sym = NULL; |
| 1428 | sec = NULL; |
| 1429 | |
| 1430 | if (r_symndx < symtab_hdr->sh_info) |
| 1431 | { |
| 1432 | sym = local_syms + r_symndx; |
| 1433 | sec = local_sections [r_symndx]; |
| 1434 | relocation = BASEADDR (sec) + sym->st_value; |
| 1435 | |
| 1436 | name = bfd_elf_string_from_elf_section |
| 1437 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 1438 | name = name == NULL ? bfd_section_name (sec) : name; |
| 1439 | } |
| 1440 | else |
| 1441 | { |
| 1442 | bfd_boolean warned, ignored; |
| 1443 | bfd_boolean unresolved_reloc; |
| 1444 | |
| 1445 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1446 | r_symndx, symtab_hdr, sym_hashes, |
| 1447 | h, sec, relocation, |
| 1448 | unresolved_reloc, warned, ignored); |
| 1449 | |
| 1450 | name = h->root.root.string; |
| 1451 | } |
| 1452 | |
| 1453 | if (sec != NULL && discarded_section (sec)) |
| 1454 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 1455 | rel, 1, relend, howto, 0, contents); |
| 1456 | |
| 1457 | if (bfd_link_relocatable (info)) |
| 1458 | continue; |
| 1459 | |
| 1460 | /* Finally, the sole IP2K-specific part. */ |
| 1461 | r = ip2k_final_link_relocate (howto, input_bfd, input_section, |
| 1462 | contents, rel, relocation); |
| 1463 | |
| 1464 | if (r != bfd_reloc_ok) |
| 1465 | { |
| 1466 | const char * msg = NULL; |
| 1467 | |
| 1468 | switch (r) |
| 1469 | { |
| 1470 | case bfd_reloc_overflow: |
| 1471 | (*info->callbacks->reloc_overflow) |
| 1472 | (info, (h ? &h->root : NULL), name, howto->name, |
| 1473 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 1474 | break; |
| 1475 | |
| 1476 | case bfd_reloc_undefined: |
| 1477 | (*info->callbacks->undefined_symbol) |
| 1478 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 1479 | break; |
| 1480 | |
| 1481 | case bfd_reloc_outofrange: |
| 1482 | msg = _("internal error: out of range error"); |
| 1483 | break; |
| 1484 | |
| 1485 | /* This is how ip2k_final_link_relocate tells us of a non-kosher |
| 1486 | reference between insn & data address spaces. */ |
| 1487 | case bfd_reloc_notsupported: |
| 1488 | if (sym != NULL) /* Only if it's not an unresolved symbol. */ |
| 1489 | msg = _("unsupported relocation between data/insn address spaces"); |
| 1490 | break; |
| 1491 | |
| 1492 | case bfd_reloc_dangerous: |
| 1493 | msg = _("internal error: dangerous relocation"); |
| 1494 | break; |
| 1495 | |
| 1496 | default: |
| 1497 | msg = _("internal error: unknown error"); |
| 1498 | break; |
| 1499 | } |
| 1500 | |
| 1501 | if (msg) |
| 1502 | (*info->callbacks->warning) (info, msg, name, input_bfd, |
| 1503 | input_section, rel->r_offset); |
| 1504 | } |
| 1505 | } |
| 1506 | |
| 1507 | return TRUE; |
| 1508 | } |
| 1509 | |
| 1510 | #define TARGET_BIG_SYM ip2k_elf32_vec |
| 1511 | #define TARGET_BIG_NAME "elf32-ip2k" |
| 1512 | |
| 1513 | #define ELF_ARCH bfd_arch_ip2k |
| 1514 | #define ELF_MACHINE_CODE EM_IP2K |
| 1515 | #define ELF_MACHINE_ALT1 EM_IP2K_OLD |
| 1516 | #define ELF_MAXPAGESIZE 1 /* No pages on the IP2K. */ |
| 1517 | |
| 1518 | #define elf_info_to_howto_rel NULL |
| 1519 | #define elf_info_to_howto ip2k_info_to_howto_rela |
| 1520 | |
| 1521 | #define elf_backend_can_gc_sections 1 |
| 1522 | #define elf_backend_rela_normal 1 |
| 1523 | #define elf_backend_relocate_section ip2k_elf_relocate_section |
| 1524 | |
| 1525 | #define elf_symbol_leading_char '_' |
| 1526 | #define bfd_elf32_bfd_reloc_type_lookup ip2k_reloc_type_lookup |
| 1527 | #define bfd_elf32_bfd_reloc_name_lookup ip2k_reloc_name_lookup |
| 1528 | #define bfd_elf32_bfd_relax_section ip2k_elf_relax_section |
| 1529 | |
| 1530 | #include "elf32-target.h" |