| 1 | /* Ubicom IP2xxx specific support for 32-bit ELF |
| 2 | Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf/ip2k.h" |
| 27 | |
| 28 | /* Struct used to pass miscellaneous paramaters which |
| 29 | helps to avoid overly long parameter lists. */ |
| 30 | struct misc |
| 31 | { |
| 32 | Elf_Internal_Shdr * symtab_hdr; |
| 33 | Elf_Internal_Rela * irelbase; |
| 34 | bfd_byte * contents; |
| 35 | Elf_Internal_Sym * isymbuf; |
| 36 | }; |
| 37 | |
| 38 | struct ip2k_opcode |
| 39 | { |
| 40 | unsigned short opcode; |
| 41 | unsigned short mask; |
| 42 | }; |
| 43 | |
| 44 | static bfd_boolean ip2k_relaxed = FALSE; |
| 45 | |
| 46 | static const struct ip2k_opcode ip2k_page_opcode[] = |
| 47 | { |
| 48 | {0x0010, 0xFFF8}, /* Page. */ |
| 49 | {0x0000, 0x0000}, |
| 50 | }; |
| 51 | |
| 52 | #define IS_PAGE_OPCODE(code) \ |
| 53 | ip2k_is_opcode (code, ip2k_page_opcode) |
| 54 | |
| 55 | static const struct ip2k_opcode ip2k_jmp_opcode[] = |
| 56 | { |
| 57 | {0xE000, 0xE000}, /* Jmp. */ |
| 58 | {0x0000, 0x0000}, |
| 59 | }; |
| 60 | |
| 61 | #define IS_JMP_OPCODE(code) \ |
| 62 | ip2k_is_opcode (code, ip2k_jmp_opcode) |
| 63 | |
| 64 | static const struct ip2k_opcode ip2k_snc_opcode[] = |
| 65 | { |
| 66 | {0xA00B, 0xFFFF}, /* Snc. */ |
| 67 | {0x0000, 0x0000}, |
| 68 | }; |
| 69 | |
| 70 | #define IS_SNC_OPCODE(code) \ |
| 71 | ip2k_is_opcode (code, ip2k_snc_opcode) |
| 72 | |
| 73 | static const struct ip2k_opcode ip2k_inc_1sp_opcode[] = |
| 74 | { |
| 75 | {0x2B81, 0xFFFF}, /* Inc 1(SP). */ |
| 76 | {0x0000, 0x0000}, |
| 77 | }; |
| 78 | |
| 79 | #define IS_INC_1SP_OPCODE(code) \ |
| 80 | ip2k_is_opcode (code, ip2k_inc_1sp_opcode) |
| 81 | |
| 82 | static const struct ip2k_opcode ip2k_add_2sp_w_opcode[] = |
| 83 | { |
| 84 | {0x1F82, 0xFFFF}, /* Add 2(SP),w. */ |
| 85 | {0x0000, 0x0000}, |
| 86 | }; |
| 87 | |
| 88 | #define IS_ADD_2SP_W_OPCODE(code) \ |
| 89 | ip2k_is_opcode (code, ip2k_add_2sp_w_opcode) |
| 90 | |
| 91 | static const struct ip2k_opcode ip2k_add_w_wreg_opcode[] = |
| 92 | { |
| 93 | {0x1C0A, 0xFFFF}, /* Add w,wreg. */ |
| 94 | {0x1E0A, 0xFFFF}, /* Add wreg,w. */ |
| 95 | {0x0000, 0x0000}, |
| 96 | }; |
| 97 | |
| 98 | #define IS_ADD_W_WREG_OPCODE(code) \ |
| 99 | ip2k_is_opcode (code, ip2k_add_w_wreg_opcode) |
| 100 | |
| 101 | static const struct ip2k_opcode ip2k_add_pcl_w_opcode[] = |
| 102 | { |
| 103 | {0x1E09, 0xFFFF}, /* Add pcl,w. */ |
| 104 | {0x0000, 0x0000}, |
| 105 | }; |
| 106 | |
| 107 | #define IS_ADD_PCL_W_OPCODE(code) \ |
| 108 | ip2k_is_opcode (code, ip2k_add_pcl_w_opcode) |
| 109 | |
| 110 | static const struct ip2k_opcode ip2k_skip_opcodes[] = |
| 111 | { |
| 112 | {0xB000, 0xF000}, /* sb */ |
| 113 | {0xA000, 0xF000}, /* snb */ |
| 114 | {0x7600, 0xFE00}, /* cse/csne #lit */ |
| 115 | {0x5800, 0xFC00}, /* incsnz */ |
| 116 | {0x4C00, 0xFC00}, /* decsnz */ |
| 117 | {0x4000, 0xFC00}, /* cse/csne */ |
| 118 | {0x3C00, 0xFC00}, /* incsz */ |
| 119 | {0x2C00, 0xFC00}, /* decsz */ |
| 120 | {0x0000, 0x0000}, |
| 121 | }; |
| 122 | |
| 123 | #define IS_SKIP_OPCODE(code) \ |
| 124 | ip2k_is_opcode (code, ip2k_skip_opcodes) |
| 125 | |
| 126 | /* Relocation tables. */ |
| 127 | static reloc_howto_type ip2k_elf_howto_table [] = |
| 128 | { |
| 129 | #define IP2K_HOWTO(t,rs,s,bs,pr,bp,name,sm,dm) \ |
| 130 | HOWTO(t, /* type */ \ |
| 131 | rs, /* rightshift */ \ |
| 132 | s, /* size (0 = byte, 1 = short, 2 = long) */ \ |
| 133 | bs, /* bitsize */ \ |
| 134 | pr, /* pc_relative */ \ |
| 135 | bp, /* bitpos */ \ |
| 136 | complain_overflow_dont,/* complain_on_overflow */ \ |
| 137 | bfd_elf_generic_reloc,/* special_function */ \ |
| 138 | name, /* name */ \ |
| 139 | FALSE, /* partial_inplace */ \ |
| 140 | sm, /* src_mask */ \ |
| 141 | dm, /* dst_mask */ \ |
| 142 | pr) /* pcrel_offset */ |
| 143 | |
| 144 | /* This reloc does nothing. */ |
| 145 | IP2K_HOWTO (R_IP2K_NONE, 0,2,32, FALSE, 0, "R_IP2K_NONE", 0, 0), |
| 146 | /* A 16 bit absolute relocation. */ |
| 147 | IP2K_HOWTO (R_IP2K_16, 0,1,16, FALSE, 0, "R_IP2K_16", 0, 0xffff), |
| 148 | /* A 32 bit absolute relocation. */ |
| 149 | IP2K_HOWTO (R_IP2K_32, 0,2,32, FALSE, 0, "R_IP2K_32", 0, 0xffffffff), |
| 150 | /* A 8-bit data relocation for the FR9 field. Ninth bit is computed specially. */ |
| 151 | IP2K_HOWTO (R_IP2K_FR9, 0,1,9, FALSE, 0, "R_IP2K_FR9", 0, 0x00ff), |
| 152 | /* A 4-bit data relocation. */ |
| 153 | IP2K_HOWTO (R_IP2K_BANK, 8,1,4, FALSE, 0, "R_IP2K_BANK", 0, 0x000f), |
| 154 | /* A 13-bit insn relocation - word address => right-shift 1 bit extra. */ |
| 155 | IP2K_HOWTO (R_IP2K_ADDR16CJP, 1,1,13, FALSE, 0, "R_IP2K_ADDR16CJP", 0, 0x1fff), |
| 156 | /* A 3-bit insn relocation - word address => right-shift 1 bit extra. */ |
| 157 | IP2K_HOWTO (R_IP2K_PAGE3, 14,1,3, FALSE, 0, "R_IP2K_PAGE3", 0, 0x0007), |
| 158 | /* Two 8-bit data relocations. */ |
| 159 | IP2K_HOWTO (R_IP2K_LO8DATA, 0,1,8, FALSE, 0, "R_IP2K_LO8DATA", 0, 0x00ff), |
| 160 | IP2K_HOWTO (R_IP2K_HI8DATA, 8,1,8, FALSE, 0, "R_IP2K_HI8DATA", 0, 0x00ff), |
| 161 | /* Two 8-bit insn relocations. word address => right-shift 1 bit extra. */ |
| 162 | IP2K_HOWTO (R_IP2K_LO8INSN, 1,1,8, FALSE, 0, "R_IP2K_LO8INSN", 0, 0x00ff), |
| 163 | IP2K_HOWTO (R_IP2K_HI8INSN, 9,1,8, FALSE, 0, "R_IP2K_HI8INSN", 0, 0x00ff), |
| 164 | |
| 165 | /* Special 1 bit relocation for SKIP instructions. */ |
| 166 | IP2K_HOWTO (R_IP2K_PC_SKIP, 1,1,1, FALSE, 12, "R_IP2K_PC_SKIP", 0xfffe, 0x1000), |
| 167 | /* 16 bit word address. */ |
| 168 | IP2K_HOWTO (R_IP2K_TEXT, 1,1,16, FALSE, 0, "R_IP2K_TEXT", 0, 0xffff), |
| 169 | /* A 7-bit offset relocation for the FR9 field. Eigth and ninth bit comes from insn. */ |
| 170 | IP2K_HOWTO (R_IP2K_FR_OFFSET, 0,1,9, FALSE, 0, "R_IP2K_FR_OFFSET", 0x180, 0x007f), |
| 171 | /* Bits 23:16 of an address. */ |
| 172 | IP2K_HOWTO (R_IP2K_EX8DATA, 16,1,8, FALSE, 0, "R_IP2K_EX8DATA", 0, 0x00ff), |
| 173 | }; |
| 174 | |
| 175 | |
| 176 | /* Map BFD reloc types to IP2K ELF reloc types. */ |
| 177 | |
| 178 | static reloc_howto_type * |
| 179 | ip2k_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, |
| 180 | bfd_reloc_code_real_type code) |
| 181 | { |
| 182 | /* Note that the ip2k_elf_howto_table is indxed by the R_ |
| 183 | constants. Thus, the order that the howto records appear in the |
| 184 | table *must* match the order of the relocation types defined in |
| 185 | include/elf/ip2k.h. */ |
| 186 | |
| 187 | switch (code) |
| 188 | { |
| 189 | case BFD_RELOC_NONE: |
| 190 | return &ip2k_elf_howto_table[ (int) R_IP2K_NONE]; |
| 191 | case BFD_RELOC_16: |
| 192 | return &ip2k_elf_howto_table[ (int) R_IP2K_16]; |
| 193 | case BFD_RELOC_32: |
| 194 | return &ip2k_elf_howto_table[ (int) R_IP2K_32]; |
| 195 | case BFD_RELOC_IP2K_FR9: |
| 196 | return &ip2k_elf_howto_table[ (int) R_IP2K_FR9]; |
| 197 | case BFD_RELOC_IP2K_BANK: |
| 198 | return &ip2k_elf_howto_table[ (int) R_IP2K_BANK]; |
| 199 | case BFD_RELOC_IP2K_ADDR16CJP: |
| 200 | return &ip2k_elf_howto_table[ (int) R_IP2K_ADDR16CJP]; |
| 201 | case BFD_RELOC_IP2K_PAGE3: |
| 202 | return &ip2k_elf_howto_table[ (int) R_IP2K_PAGE3]; |
| 203 | case BFD_RELOC_IP2K_LO8DATA: |
| 204 | return &ip2k_elf_howto_table[ (int) R_IP2K_LO8DATA]; |
| 205 | case BFD_RELOC_IP2K_HI8DATA: |
| 206 | return &ip2k_elf_howto_table[ (int) R_IP2K_HI8DATA]; |
| 207 | case BFD_RELOC_IP2K_LO8INSN: |
| 208 | return &ip2k_elf_howto_table[ (int) R_IP2K_LO8INSN]; |
| 209 | case BFD_RELOC_IP2K_HI8INSN: |
| 210 | return &ip2k_elf_howto_table[ (int) R_IP2K_HI8INSN]; |
| 211 | case BFD_RELOC_IP2K_PC_SKIP: |
| 212 | return &ip2k_elf_howto_table[ (int) R_IP2K_PC_SKIP]; |
| 213 | case BFD_RELOC_IP2K_TEXT: |
| 214 | return &ip2k_elf_howto_table[ (int) R_IP2K_TEXT]; |
| 215 | case BFD_RELOC_IP2K_FR_OFFSET: |
| 216 | return &ip2k_elf_howto_table[ (int) R_IP2K_FR_OFFSET]; |
| 217 | case BFD_RELOC_IP2K_EX8DATA: |
| 218 | return &ip2k_elf_howto_table[ (int) R_IP2K_EX8DATA]; |
| 219 | default: |
| 220 | /* Pacify gcc -Wall. */ |
| 221 | return NULL; |
| 222 | } |
| 223 | return NULL; |
| 224 | } |
| 225 | |
| 226 | static reloc_howto_type * |
| 227 | ip2k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) |
| 228 | { |
| 229 | unsigned int i; |
| 230 | |
| 231 | for (i = 0; |
| 232 | i < sizeof (ip2k_elf_howto_table) / sizeof (ip2k_elf_howto_table[0]); |
| 233 | i++) |
| 234 | if (ip2k_elf_howto_table[i].name != NULL |
| 235 | && strcasecmp (ip2k_elf_howto_table[i].name, r_name) == 0) |
| 236 | return &ip2k_elf_howto_table[i]; |
| 237 | |
| 238 | return NULL; |
| 239 | } |
| 240 | |
| 241 | static void |
| 242 | ip2k_get_mem (bfd *abfd ATTRIBUTE_UNUSED, |
| 243 | bfd_byte *addr, |
| 244 | int length, |
| 245 | bfd_byte *ptr) |
| 246 | { |
| 247 | while (length --) |
| 248 | * ptr ++ = bfd_get_8 (abfd, addr ++); |
| 249 | } |
| 250 | |
| 251 | static bfd_boolean |
| 252 | ip2k_is_opcode (bfd_byte *code, const struct ip2k_opcode *opcodes) |
| 253 | { |
| 254 | unsigned short insn = (code[0] << 8) | code[1]; |
| 255 | |
| 256 | while (opcodes->mask != 0) |
| 257 | { |
| 258 | if ((insn & opcodes->mask) == opcodes->opcode) |
| 259 | return TRUE; |
| 260 | |
| 261 | opcodes ++; |
| 262 | } |
| 263 | |
| 264 | return FALSE; |
| 265 | } |
| 266 | |
| 267 | #define PAGENO(ABSADDR) ((ABSADDR) & 0xFFFFC000) |
| 268 | #define BASEADDR(SEC) ((SEC)->output_section->vma + (SEC)->output_offset) |
| 269 | |
| 270 | #define UNDEFINED_SYMBOL (~(bfd_vma)0) |
| 271 | |
| 272 | /* Return the value of the symbol associated with the relocation IREL. */ |
| 273 | |
| 274 | static bfd_vma |
| 275 | symbol_value (bfd *abfd, |
| 276 | Elf_Internal_Shdr *symtab_hdr, |
| 277 | Elf_Internal_Sym *isymbuf, |
| 278 | Elf_Internal_Rela *irel) |
| 279 | { |
| 280 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 281 | { |
| 282 | Elf_Internal_Sym *isym; |
| 283 | asection *sym_sec; |
| 284 | |
| 285 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 286 | if (isym->st_shndx == SHN_UNDEF) |
| 287 | sym_sec = bfd_und_section_ptr; |
| 288 | else if (isym->st_shndx == SHN_ABS) |
| 289 | sym_sec = bfd_abs_section_ptr; |
| 290 | else if (isym->st_shndx == SHN_COMMON) |
| 291 | sym_sec = bfd_com_section_ptr; |
| 292 | else |
| 293 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 294 | |
| 295 | return isym->st_value + BASEADDR (sym_sec); |
| 296 | } |
| 297 | else |
| 298 | { |
| 299 | unsigned long indx; |
| 300 | struct elf_link_hash_entry *h; |
| 301 | |
| 302 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| 303 | h = elf_sym_hashes (abfd)[indx]; |
| 304 | BFD_ASSERT (h != NULL); |
| 305 | |
| 306 | if (h->root.type != bfd_link_hash_defined |
| 307 | && h->root.type != bfd_link_hash_defweak) |
| 308 | return UNDEFINED_SYMBOL; |
| 309 | |
| 310 | return (h->root.u.def.value + BASEADDR (h->root.u.def.section)); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | /* Determine if the instruction sequence matches that for |
| 315 | the prologue of a switch dispatch table with fewer than |
| 316 | 128 entries. |
| 317 | |
| 318 | sc |
| 319 | page $nnn0 |
| 320 | jmp $nnn0 |
| 321 | add w,wreg |
| 322 | add pcl,w |
| 323 | addr=> |
| 324 | page $nnn1 |
| 325 | jmp $nnn1 |
| 326 | page $nnn2 |
| 327 | jmp $nnn2 |
| 328 | ... |
| 329 | page $nnnN |
| 330 | jmp $nnnN |
| 331 | |
| 332 | After relaxation. |
| 333 | sc |
| 334 | page $nnn0 |
| 335 | jmp $nnn0 |
| 336 | add pcl,w |
| 337 | addr=> |
| 338 | jmp $nnn1 |
| 339 | jmp $nnn2 |
| 340 | ... |
| 341 | jmp $nnnN */ |
| 342 | |
| 343 | static int |
| 344 | ip2k_is_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, |
| 345 | asection *sec, |
| 346 | bfd_vma addr, |
| 347 | bfd_byte *contents) |
| 348 | { |
| 349 | bfd_byte code[4]; |
| 350 | int index = 0; |
| 351 | |
| 352 | /* Check current page-jmp. */ |
| 353 | if (addr + 4 > sec->size) |
| 354 | return -1; |
| 355 | |
| 356 | ip2k_get_mem (abfd, contents + addr, 4, code); |
| 357 | |
| 358 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 359 | || (! IS_JMP_OPCODE (code + 2))) |
| 360 | return -1; |
| 361 | |
| 362 | /* Search back. */ |
| 363 | while (1) |
| 364 | { |
| 365 | if (addr < 4) |
| 366 | return -1; |
| 367 | |
| 368 | /* Check previous 2 instructions. */ |
| 369 | ip2k_get_mem (abfd, contents + addr - 4, 4, code); |
| 370 | if ((IS_ADD_W_WREG_OPCODE (code + 0)) |
| 371 | && (IS_ADD_PCL_W_OPCODE (code + 2))) |
| 372 | return index; |
| 373 | |
| 374 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 375 | || (! IS_JMP_OPCODE (code + 2))) |
| 376 | return -1; |
| 377 | |
| 378 | index++; |
| 379 | addr -= 4; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | /* Determine if the instruction sequence matches that for |
| 384 | the prologue switch dispatch table with fewer than |
| 385 | 256 entries but more than 127. |
| 386 | |
| 387 | Before relaxation. |
| 388 | push %lo8insn(label) ; Push address of table |
| 389 | push %hi8insn(label) |
| 390 | add w,wreg ; index*2 => offset |
| 391 | snc ; CARRY SET? |
| 392 | inc 1(sp) ; Propagate MSB into table address |
| 393 | add 2(sp),w ; Add low bits of offset to table address |
| 394 | snc ; and handle any carry-out |
| 395 | inc 1(sp) |
| 396 | addr=> |
| 397 | page __indjmp ; Do an indirect jump to that location |
| 398 | jmp __indjmp |
| 399 | label: ; case dispatch table starts here |
| 400 | page $nnn1 |
| 401 | jmp $nnn1 |
| 402 | page $nnn2 |
| 403 | jmp $nnn2 |
| 404 | ... |
| 405 | page $nnnN |
| 406 | jmp $nnnN |
| 407 | |
| 408 | After relaxation. |
| 409 | push %lo8insn(label) ; Push address of table |
| 410 | push %hi8insn(label) |
| 411 | add 2(sp),w ; Add low bits of offset to table address |
| 412 | snc ; and handle any carry-out |
| 413 | inc 1(sp) |
| 414 | addr=> |
| 415 | page __indjmp ; Do an indirect jump to that location |
| 416 | jmp __indjmp |
| 417 | label: ; case dispatch table starts here |
| 418 | jmp $nnn1 |
| 419 | jmp $nnn2 |
| 420 | ... |
| 421 | jmp $nnnN */ |
| 422 | |
| 423 | static int |
| 424 | ip2k_is_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, |
| 425 | asection *sec, |
| 426 | bfd_vma addr, |
| 427 | bfd_byte *contents) |
| 428 | { |
| 429 | bfd_byte code[16]; |
| 430 | int index = 0; |
| 431 | |
| 432 | /* Check current page-jmp. */ |
| 433 | if (addr + 4 > sec->size) |
| 434 | return -1; |
| 435 | |
| 436 | ip2k_get_mem (abfd, contents + addr, 4, code); |
| 437 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 438 | || (! IS_JMP_OPCODE (code + 2))) |
| 439 | return -1; |
| 440 | |
| 441 | /* Search back. */ |
| 442 | while (1) |
| 443 | { |
| 444 | if (addr < 16) |
| 445 | return -1; |
| 446 | |
| 447 | /* Check previous 8 instructions. */ |
| 448 | ip2k_get_mem (abfd, contents + addr - 16, 16, code); |
| 449 | if ((IS_ADD_W_WREG_OPCODE (code + 0)) |
| 450 | && (IS_SNC_OPCODE (code + 2)) |
| 451 | && (IS_INC_1SP_OPCODE (code + 4)) |
| 452 | && (IS_ADD_2SP_W_OPCODE (code + 6)) |
| 453 | && (IS_SNC_OPCODE (code + 8)) |
| 454 | && (IS_INC_1SP_OPCODE (code + 10)) |
| 455 | && (IS_PAGE_OPCODE (code + 12)) |
| 456 | && (IS_JMP_OPCODE (code + 14))) |
| 457 | return index; |
| 458 | |
| 459 | if ((IS_ADD_W_WREG_OPCODE (code + 2)) |
| 460 | && (IS_SNC_OPCODE (code + 4)) |
| 461 | && (IS_INC_1SP_OPCODE (code + 6)) |
| 462 | && (IS_ADD_2SP_W_OPCODE (code + 8)) |
| 463 | && (IS_SNC_OPCODE (code + 10)) |
| 464 | && (IS_INC_1SP_OPCODE (code + 12)) |
| 465 | && (IS_JMP_OPCODE (code + 14))) |
| 466 | return index; |
| 467 | |
| 468 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 469 | || (! IS_JMP_OPCODE (code + 2))) |
| 470 | return -1; |
| 471 | |
| 472 | index++; |
| 473 | addr -= 4; |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | /* Returns the expected page state for the given instruction not including |
| 478 | the effect of page instructions. */ |
| 479 | |
| 480 | static bfd_vma |
| 481 | ip2k_nominal_page_bits (bfd *abfd ATTRIBUTE_UNUSED, |
| 482 | asection *sec, |
| 483 | bfd_vma addr, |
| 484 | bfd_byte *contents) |
| 485 | { |
| 486 | bfd_vma page = PAGENO (BASEADDR (sec) + addr); |
| 487 | |
| 488 | /* Check if section flows into this page. If not then the page |
| 489 | bits are assumed to match the PC. This will be true unless |
| 490 | the user has a page instruction without a call/jump, in which |
| 491 | case they are on their own. */ |
| 492 | if (PAGENO (BASEADDR (sec)) == page) |
| 493 | return page; |
| 494 | |
| 495 | /* Section flows across page boundary. The page bits should match |
| 496 | the PC unless there is a possible flow from the previous page, |
| 497 | in which case it is not possible to determine the value of the |
| 498 | page bits. */ |
| 499 | while (PAGENO (BASEADDR (sec) + addr - 2) == page) |
| 500 | { |
| 501 | bfd_byte code[2]; |
| 502 | |
| 503 | addr -= 2; |
| 504 | ip2k_get_mem (abfd, contents + addr, 2, code); |
| 505 | if (!IS_PAGE_OPCODE (code)) |
| 506 | continue; |
| 507 | |
| 508 | /* Found a page instruction, check if jump table. */ |
| 509 | if (ip2k_is_switch_table_128 (abfd, sec, addr, contents) != -1) |
| 510 | /* Jump table => page is conditional. */ |
| 511 | continue; |
| 512 | |
| 513 | if (ip2k_is_switch_table_256 (abfd, sec, addr, contents) != -1) |
| 514 | /* Jump table => page is conditional. */ |
| 515 | continue; |
| 516 | |
| 517 | /* Found a page instruction, check if conditional. */ |
| 518 | if (addr >= 2) |
| 519 | { |
| 520 | ip2k_get_mem (abfd, contents + addr - 2, 2, code); |
| 521 | if (IS_SKIP_OPCODE (code)) |
| 522 | /* Page is conditional. */ |
| 523 | continue; |
| 524 | } |
| 525 | |
| 526 | /* Unconditional page instruction => page bits should be correct. */ |
| 527 | return page; |
| 528 | } |
| 529 | |
| 530 | /* Flow from previous page => page bits are impossible to determine. */ |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static bfd_boolean |
| 535 | ip2k_test_page_insn (bfd *abfd ATTRIBUTE_UNUSED, |
| 536 | asection *sec, |
| 537 | Elf_Internal_Rela *irel, |
| 538 | struct misc *misc) |
| 539 | { |
| 540 | bfd_vma symval; |
| 541 | |
| 542 | /* Get the value of the symbol referred to by the reloc. */ |
| 543 | symval = symbol_value (abfd, misc->symtab_hdr, misc->isymbuf, irel); |
| 544 | if (symval == UNDEFINED_SYMBOL) |
| 545 | /* This appears to be a reference to an undefined |
| 546 | symbol. Just ignore it--it will be caught by the |
| 547 | regular reloc processing. */ |
| 548 | return FALSE; |
| 549 | |
| 550 | /* Test if we can delete this page instruction. */ |
| 551 | if (PAGENO (symval + irel->r_addend) != |
| 552 | ip2k_nominal_page_bits (abfd, sec, irel->r_offset, misc->contents)) |
| 553 | return FALSE; |
| 554 | |
| 555 | return TRUE; |
| 556 | } |
| 557 | |
| 558 | /* Parts of a Stabs entry. */ |
| 559 | |
| 560 | #define STRDXOFF 0 |
| 561 | #define TYPEOFF 4 |
| 562 | #define OTHEROFF 5 |
| 563 | #define DESCOFF 6 |
| 564 | #define VALOFF 8 |
| 565 | #define STABSIZE 12 |
| 566 | |
| 567 | /* Adjust all the relocations entries after adding or inserting instructions. */ |
| 568 | |
| 569 | static void |
| 570 | adjust_all_relocations (bfd *abfd, |
| 571 | asection *sec, |
| 572 | bfd_vma addr, |
| 573 | bfd_vma endaddr, |
| 574 | int count, |
| 575 | int noadj) |
| 576 | { |
| 577 | Elf_Internal_Shdr *symtab_hdr; |
| 578 | Elf_Internal_Sym *isymbuf, *isym, *isymend; |
| 579 | unsigned int shndx; |
| 580 | bfd_byte *contents; |
| 581 | Elf_Internal_Rela *irel, *irelend, *irelbase; |
| 582 | struct elf_link_hash_entry **sym_hashes; |
| 583 | struct elf_link_hash_entry **end_hashes; |
| 584 | unsigned int symcount; |
| 585 | asection *stab; |
| 586 | |
| 587 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 588 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 589 | |
| 590 | shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 591 | |
| 592 | contents = elf_section_data (sec)->this_hdr.contents; |
| 593 | |
| 594 | irelbase = elf_section_data (sec)->relocs; |
| 595 | irelend = irelbase + sec->reloc_count; |
| 596 | |
| 597 | for (irel = irelbase; irel < irelend; irel++) |
| 598 | { |
| 599 | if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE) |
| 600 | { |
| 601 | /* Get the value of the symbol referred to by the reloc. */ |
| 602 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 603 | { |
| 604 | asection *sym_sec; |
| 605 | |
| 606 | /* A local symbol. */ |
| 607 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 608 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 609 | |
| 610 | if (isym->st_shndx == shndx) |
| 611 | { |
| 612 | bfd_vma baseaddr = BASEADDR (sec); |
| 613 | bfd_vma symval = BASEADDR (sym_sec) + isym->st_value |
| 614 | + irel->r_addend; |
| 615 | |
| 616 | if ((baseaddr + addr + noadj) <= symval |
| 617 | && symval < (baseaddr + endaddr)) |
| 618 | irel->r_addend += count; |
| 619 | } |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /* Do this only for PC space relocations. */ |
| 624 | if (addr <= irel->r_offset && irel->r_offset < endaddr) |
| 625 | irel->r_offset += count; |
| 626 | } |
| 627 | |
| 628 | /* Now fix the stab relocations. */ |
| 629 | stab = bfd_get_section_by_name (abfd, ".stab"); |
| 630 | if (stab) |
| 631 | { |
| 632 | bfd_byte *stabcontents, *stabend, *stabp; |
| 633 | bfd_size_type stab_size = stab->rawsize ? stab->rawsize : stab->size; |
| 634 | |
| 635 | irelbase = elf_section_data (stab)->relocs; |
| 636 | irelend = irelbase + stab->reloc_count; |
| 637 | |
| 638 | /* Pull out the contents of the stab section. */ |
| 639 | if (elf_section_data (stab)->this_hdr.contents != NULL) |
| 640 | stabcontents = elf_section_data (stab)->this_hdr.contents; |
| 641 | else |
| 642 | { |
| 643 | if (!bfd_malloc_and_get_section (abfd, stab, &stabcontents)) |
| 644 | { |
| 645 | if (stabcontents != NULL) |
| 646 | free (stabcontents); |
| 647 | return; |
| 648 | } |
| 649 | |
| 650 | /* We need to remember this. */ |
| 651 | elf_section_data (stab)->this_hdr.contents = stabcontents; |
| 652 | } |
| 653 | |
| 654 | stabend = stabcontents + stab_size; |
| 655 | |
| 656 | for (irel = irelbase; irel < irelend; irel++) |
| 657 | { |
| 658 | if (ELF32_R_TYPE (irel->r_info) != R_IP2K_NONE) |
| 659 | { |
| 660 | /* Get the value of the symbol referred to by the reloc. */ |
| 661 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| 662 | { |
| 663 | asection *sym_sec; |
| 664 | |
| 665 | /* A local symbol. */ |
| 666 | isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| 667 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 668 | |
| 669 | if (sym_sec == sec) |
| 670 | { |
| 671 | const char *name; |
| 672 | unsigned long strx; |
| 673 | unsigned char type, other; |
| 674 | unsigned short desc; |
| 675 | bfd_vma value; |
| 676 | bfd_vma baseaddr = BASEADDR (sec); |
| 677 | bfd_vma symval = BASEADDR (sym_sec) + isym->st_value |
| 678 | + irel->r_addend; |
| 679 | |
| 680 | if ((baseaddr + addr) <= symval |
| 681 | && symval <= (baseaddr + endaddr)) |
| 682 | irel->r_addend += count; |
| 683 | |
| 684 | /* Go hunt up a function and fix its line info if needed. */ |
| 685 | stabp = stabcontents + irel->r_offset - 8; |
| 686 | |
| 687 | /* Go pullout the stab entry. */ |
| 688 | strx = bfd_h_get_32 (abfd, stabp + STRDXOFF); |
| 689 | type = bfd_h_get_8 (abfd, stabp + TYPEOFF); |
| 690 | other = bfd_h_get_8 (abfd, stabp + OTHEROFF); |
| 691 | desc = bfd_h_get_16 (abfd, stabp + DESCOFF); |
| 692 | value = bfd_h_get_32 (abfd, stabp + VALOFF); |
| 693 | |
| 694 | name = bfd_get_stab_name (type); |
| 695 | |
| 696 | if (strcmp (name, "FUN") == 0) |
| 697 | { |
| 698 | int function_adjusted = 0; |
| 699 | |
| 700 | if (symval > (baseaddr + addr)) |
| 701 | /* Not in this function. */ |
| 702 | continue; |
| 703 | |
| 704 | /* Hey we got a function hit. */ |
| 705 | stabp += STABSIZE; |
| 706 | for (;stabp < stabend; stabp += STABSIZE) |
| 707 | { |
| 708 | /* Go pullout the stab entry. */ |
| 709 | strx = bfd_h_get_32 (abfd, stabp + STRDXOFF); |
| 710 | type = bfd_h_get_8 (abfd, stabp + TYPEOFF); |
| 711 | other = bfd_h_get_8 (abfd, stabp + OTHEROFF); |
| 712 | desc = bfd_h_get_16 (abfd, stabp + DESCOFF); |
| 713 | value = bfd_h_get_32 (abfd, stabp + VALOFF); |
| 714 | |
| 715 | name = bfd_get_stab_name (type); |
| 716 | |
| 717 | if (strcmp (name, "FUN") == 0) |
| 718 | { |
| 719 | /* Hit another function entry. */ |
| 720 | if (function_adjusted) |
| 721 | { |
| 722 | /* Adjust the value. */ |
| 723 | value += count; |
| 724 | |
| 725 | /* We need to put it back. */ |
| 726 | bfd_h_put_32 (abfd, value,stabp + VALOFF); |
| 727 | } |
| 728 | |
| 729 | /* And then bale out. */ |
| 730 | break; |
| 731 | } |
| 732 | |
| 733 | if (strcmp (name, "SLINE") == 0) |
| 734 | { |
| 735 | /* Got a line entry. */ |
| 736 | if ((baseaddr + addr) <= (symval + value)) |
| 737 | { |
| 738 | /* Adjust the line entry. */ |
| 739 | value += count; |
| 740 | |
| 741 | /* We need to put it back. */ |
| 742 | bfd_h_put_32 (abfd, value,stabp + VALOFF); |
| 743 | function_adjusted = 1; |
| 744 | } |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | } |
| 749 | } |
| 750 | } |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | /* When adding an instruction back it is sometimes necessary to move any |
| 755 | global or local symbol that was referencing the first instruction of |
| 756 | the moved block to refer to the first instruction of the inserted block. |
| 757 | |
| 758 | For example adding a PAGE instruction before a CALL or JMP requires |
| 759 | that any label on the CALL or JMP is moved to the PAGE insn. */ |
| 760 | addr += noadj; |
| 761 | |
| 762 | /* Adjust the local symbols defined in this section. */ |
| 763 | isymend = isymbuf + symtab_hdr->sh_info; |
| 764 | for (isym = isymbuf; isym < isymend; isym++) |
| 765 | { |
| 766 | if (isym->st_shndx == shndx |
| 767 | && addr <= isym->st_value |
| 768 | && isym->st_value < endaddr) |
| 769 | isym->st_value += count; |
| 770 | } |
| 771 | |
| 772 | /* Now adjust the global symbols defined in this section. */ |
| 773 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| 774 | - symtab_hdr->sh_info); |
| 775 | sym_hashes = elf_sym_hashes (abfd); |
| 776 | end_hashes = sym_hashes + symcount; |
| 777 | for (; sym_hashes < end_hashes; sym_hashes++) |
| 778 | { |
| 779 | struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| 780 | |
| 781 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 782 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 783 | && sym_hash->root.u.def.section == sec) |
| 784 | { |
| 785 | if (addr <= sym_hash->root.u.def.value |
| 786 | && sym_hash->root.u.def.value < endaddr) |
| 787 | sym_hash->root.u.def.value += count; |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | return; |
| 792 | } |
| 793 | |
| 794 | /* Delete some bytes from a section while relaxing. */ |
| 795 | |
| 796 | static bfd_boolean |
| 797 | ip2k_elf_relax_delete_bytes (bfd *abfd, |
| 798 | asection *sec, |
| 799 | bfd_vma addr, |
| 800 | int count) |
| 801 | { |
| 802 | bfd_byte *contents = elf_section_data (sec)->this_hdr.contents; |
| 803 | bfd_vma endaddr = sec->size; |
| 804 | |
| 805 | /* Actually delete the bytes. */ |
| 806 | memmove (contents + addr, contents + addr + count, |
| 807 | endaddr - addr - count); |
| 808 | |
| 809 | sec->size -= count; |
| 810 | |
| 811 | adjust_all_relocations (abfd, sec, addr + count, endaddr, -count, 0); |
| 812 | return TRUE; |
| 813 | } |
| 814 | |
| 815 | static bfd_boolean |
| 816 | ip2k_delete_page_insn (bfd *abfd ATTRIBUTE_UNUSED, |
| 817 | asection *sec, |
| 818 | Elf_Internal_Rela *irel, |
| 819 | bfd_boolean *again, |
| 820 | struct misc *misc) |
| 821 | { |
| 822 | /* Note that we've changed the relocs, section contents, etc. */ |
| 823 | elf_section_data (sec)->relocs = misc->irelbase; |
| 824 | elf_section_data (sec)->this_hdr.contents = misc->contents; |
| 825 | misc->symtab_hdr->contents = (bfd_byte *) misc->isymbuf; |
| 826 | |
| 827 | /* Fix the relocation's type. */ |
| 828 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_IP2K_NONE); |
| 829 | |
| 830 | /* Delete the PAGE insn. */ |
| 831 | if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 2)) |
| 832 | return FALSE; |
| 833 | |
| 834 | /* Modified => will need to iterate relaxation again. */ |
| 835 | *again = TRUE; |
| 836 | |
| 837 | return TRUE; |
| 838 | } |
| 839 | |
| 840 | static bfd_boolean |
| 841 | ip2k_relax_switch_table_128 (bfd *abfd ATTRIBUTE_UNUSED, |
| 842 | asection *sec, |
| 843 | Elf_Internal_Rela *irel, |
| 844 | bfd_boolean *again, |
| 845 | struct misc *misc) |
| 846 | { |
| 847 | Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| 848 | Elf_Internal_Rela *ireltest = irel; |
| 849 | bfd_byte code[4]; |
| 850 | bfd_vma addr; |
| 851 | |
| 852 | /* Test all page instructions. */ |
| 853 | addr = irel->r_offset; |
| 854 | while (1) |
| 855 | { |
| 856 | if (addr + 4 > sec->size) |
| 857 | break; |
| 858 | |
| 859 | ip2k_get_mem (abfd, misc->contents + addr, 4, code); |
| 860 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 861 | || (! IS_JMP_OPCODE (code + 2))) |
| 862 | break; |
| 863 | |
| 864 | /* Validate relocation entry (every entry should have a matching |
| 865 | relocation entry). */ |
| 866 | if (ireltest >= irelend) |
| 867 | { |
| 868 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 869 | return FALSE; |
| 870 | } |
| 871 | |
| 872 | if (ireltest->r_offset != addr) |
| 873 | { |
| 874 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 875 | return FALSE; |
| 876 | } |
| 877 | |
| 878 | if (! ip2k_test_page_insn (abfd, sec, ireltest, misc)) |
| 879 | /* Un-removable page insn => nothing can be done. */ |
| 880 | return TRUE; |
| 881 | |
| 882 | addr += 4; |
| 883 | ireltest += 2; |
| 884 | } |
| 885 | |
| 886 | /* Relaxable. Adjust table header. */ |
| 887 | ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 4, code); |
| 888 | if ((! IS_ADD_W_WREG_OPCODE (code + 0)) |
| 889 | || (! IS_ADD_PCL_W_OPCODE (code + 2))) |
| 890 | { |
| 891 | _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); |
| 892 | return FALSE; |
| 893 | } |
| 894 | |
| 895 | if (!ip2k_elf_relax_delete_bytes (abfd, sec, irel->r_offset - 4, 2)) |
| 896 | return FALSE; |
| 897 | |
| 898 | *again = TRUE; |
| 899 | |
| 900 | /* Delete all page instructions in table. */ |
| 901 | while (irel < ireltest) |
| 902 | { |
| 903 | if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| 904 | return FALSE; |
| 905 | irel += 2; |
| 906 | } |
| 907 | |
| 908 | return TRUE; |
| 909 | } |
| 910 | |
| 911 | static bfd_boolean |
| 912 | ip2k_relax_switch_table_256 (bfd *abfd ATTRIBUTE_UNUSED, |
| 913 | asection *sec, |
| 914 | Elf_Internal_Rela *irel, |
| 915 | bfd_boolean *again, |
| 916 | struct misc *misc) |
| 917 | { |
| 918 | Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| 919 | Elf_Internal_Rela *ireltest = irel; |
| 920 | bfd_byte code[12]; |
| 921 | bfd_vma addr; |
| 922 | |
| 923 | /* Test all page instructions. */ |
| 924 | addr = irel->r_offset; |
| 925 | |
| 926 | while (1) |
| 927 | { |
| 928 | if (addr + 4 > sec->size) |
| 929 | break; |
| 930 | |
| 931 | ip2k_get_mem (abfd, misc->contents + addr, 4, code); |
| 932 | |
| 933 | if ((! IS_PAGE_OPCODE (code + 0)) |
| 934 | || (! IS_JMP_OPCODE (code + 2))) |
| 935 | break; |
| 936 | |
| 937 | /* Validate relocation entry (every entry should have a matching |
| 938 | relocation entry). */ |
| 939 | if (ireltest >= irelend) |
| 940 | { |
| 941 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 942 | return FALSE; |
| 943 | } |
| 944 | |
| 945 | if (ireltest->r_offset != addr) |
| 946 | { |
| 947 | _bfd_error_handler (_("ip2k relaxer: switch table without complete matching relocation information.")); |
| 948 | return FALSE; |
| 949 | } |
| 950 | |
| 951 | if (!ip2k_test_page_insn (abfd, sec, ireltest, misc)) |
| 952 | /* Un-removable page insn => nothing can be done. */ |
| 953 | return TRUE; |
| 954 | |
| 955 | addr += 4; |
| 956 | ireltest += 2; |
| 957 | } |
| 958 | |
| 959 | /* Relaxable. Adjust table header. */ |
| 960 | ip2k_get_mem (abfd, misc->contents + irel->r_offset - 4, 2, code); |
| 961 | if (IS_PAGE_OPCODE (code)) |
| 962 | addr = irel->r_offset - 16; |
| 963 | else |
| 964 | addr = irel->r_offset - 14; |
| 965 | |
| 966 | ip2k_get_mem (abfd, misc->contents + addr, 12, code); |
| 967 | if ((!IS_ADD_W_WREG_OPCODE (code + 0)) |
| 968 | || (!IS_SNC_OPCODE (code + 2)) |
| 969 | || (!IS_INC_1SP_OPCODE (code + 4)) |
| 970 | || (!IS_ADD_2SP_W_OPCODE (code + 6)) |
| 971 | || (!IS_SNC_OPCODE (code + 8)) |
| 972 | || (!IS_INC_1SP_OPCODE (code + 10))) |
| 973 | { |
| 974 | _bfd_error_handler (_("ip2k relaxer: switch table header corrupt.")); |
| 975 | return FALSE; |
| 976 | } |
| 977 | |
| 978 | /* Delete first 3 opcodes. */ |
| 979 | if (!ip2k_elf_relax_delete_bytes (abfd, sec, addr + 0, 6)) |
| 980 | return FALSE; |
| 981 | |
| 982 | *again = TRUE; |
| 983 | |
| 984 | /* Delete all page instructions in table. */ |
| 985 | while (irel < ireltest) |
| 986 | { |
| 987 | if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| 988 | return FALSE; |
| 989 | irel += 2; |
| 990 | } |
| 991 | |
| 992 | return TRUE; |
| 993 | } |
| 994 | |
| 995 | /* This function handles relaxation of a section in a specific page. */ |
| 996 | |
| 997 | static bfd_boolean |
| 998 | ip2k_elf_relax_section_page (bfd *abfd, |
| 999 | asection *sec, |
| 1000 | bfd_boolean *again, |
| 1001 | struct misc *misc, |
| 1002 | unsigned long page_start, |
| 1003 | unsigned long page_end) |
| 1004 | { |
| 1005 | Elf_Internal_Rela *irelend = misc->irelbase + sec->reloc_count; |
| 1006 | Elf_Internal_Rela *irel; |
| 1007 | int switch_table_128; |
| 1008 | int switch_table_256; |
| 1009 | |
| 1010 | /* Walk thru the section looking for relaxation opportunities. */ |
| 1011 | for (irel = misc->irelbase; irel < irelend; irel++) |
| 1012 | { |
| 1013 | if (ELF32_R_TYPE (irel->r_info) != (int) R_IP2K_PAGE3) |
| 1014 | /* Ignore non page instructions. */ |
| 1015 | continue; |
| 1016 | |
| 1017 | if (BASEADDR (sec) + irel->r_offset < page_start) |
| 1018 | /* Ignore page instructions on earlier page - they have |
| 1019 | already been processed. Remember that there is code flow |
| 1020 | that crosses a page boundary. */ |
| 1021 | continue; |
| 1022 | |
| 1023 | if (BASEADDR (sec) + irel->r_offset > page_end) |
| 1024 | /* Flow beyond end of page => nothing more to do for this page. */ |
| 1025 | return TRUE; |
| 1026 | |
| 1027 | /* Detect switch tables. */ |
| 1028 | switch_table_128 = ip2k_is_switch_table_128 (abfd, sec, irel->r_offset, misc->contents); |
| 1029 | switch_table_256 = ip2k_is_switch_table_256 (abfd, sec, irel->r_offset, misc->contents); |
| 1030 | |
| 1031 | if ((switch_table_128 > 0) || (switch_table_256 > 0)) |
| 1032 | /* If the index is greater than 0 then it has already been processed. */ |
| 1033 | continue; |
| 1034 | |
| 1035 | if (switch_table_128 == 0) |
| 1036 | { |
| 1037 | if (!ip2k_relax_switch_table_128 (abfd, sec, irel, again, misc)) |
| 1038 | return FALSE; |
| 1039 | |
| 1040 | continue; |
| 1041 | } |
| 1042 | |
| 1043 | if (switch_table_256 == 0) |
| 1044 | { |
| 1045 | if (!ip2k_relax_switch_table_256 (abfd, sec, irel, again, misc)) |
| 1046 | return FALSE; |
| 1047 | |
| 1048 | continue; |
| 1049 | } |
| 1050 | |
| 1051 | /* Simple relax. */ |
| 1052 | if (ip2k_test_page_insn (abfd, sec, irel, misc)) |
| 1053 | { |
| 1054 | if (!ip2k_delete_page_insn (abfd, sec, irel, again, misc)) |
| 1055 | return FALSE; |
| 1056 | |
| 1057 | continue; |
| 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | return TRUE; |
| 1062 | } |
| 1063 | |
| 1064 | /* This function handles relaxing for the ip2k. |
| 1065 | |
| 1066 | Principle: Start with the first page and remove page instructions that |
| 1067 | are not require on this first page. By removing page instructions more |
| 1068 | code will fit into this page - repeat until nothing more can be achieved |
| 1069 | for this page. Move on to the next page. |
| 1070 | |
| 1071 | Processing the pages one at a time from the lowest page allows a removal |
| 1072 | only policy to be used - pages can be removed but are never reinserted. */ |
| 1073 | |
| 1074 | static bfd_boolean |
| 1075 | ip2k_elf_relax_section (bfd *abfd, |
| 1076 | asection *sec, |
| 1077 | struct bfd_link_info *link_info, |
| 1078 | bfd_boolean *again) |
| 1079 | { |
| 1080 | Elf_Internal_Shdr *symtab_hdr; |
| 1081 | Elf_Internal_Rela *internal_relocs; |
| 1082 | bfd_byte *contents = NULL; |
| 1083 | Elf_Internal_Sym *isymbuf = NULL; |
| 1084 | static asection * first_section = NULL; |
| 1085 | static unsigned long search_addr; |
| 1086 | static unsigned long page_start = 0; |
| 1087 | static unsigned long page_end = 0; |
| 1088 | static unsigned int pass = 0; |
| 1089 | static bfd_boolean new_pass = FALSE; |
| 1090 | static bfd_boolean changed = FALSE; |
| 1091 | struct misc misc; |
| 1092 | asection *stab; |
| 1093 | |
| 1094 | /* Assume nothing changes. */ |
| 1095 | *again = FALSE; |
| 1096 | |
| 1097 | if (first_section == NULL) |
| 1098 | { |
| 1099 | ip2k_relaxed = TRUE; |
| 1100 | first_section = sec; |
| 1101 | } |
| 1102 | |
| 1103 | if (first_section == sec) |
| 1104 | { |
| 1105 | pass++; |
| 1106 | new_pass = TRUE; |
| 1107 | } |
| 1108 | |
| 1109 | /* We don't have to do anything for a relocatable link, |
| 1110 | if this section does not have relocs, or if this is |
| 1111 | not a code section. */ |
| 1112 | if (link_info->relocatable |
| 1113 | || (sec->flags & SEC_RELOC) == 0 |
| 1114 | || sec->reloc_count == 0 |
| 1115 | || (sec->flags & SEC_CODE) == 0) |
| 1116 | return TRUE; |
| 1117 | |
| 1118 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1119 | |
| 1120 | internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, |
| 1121 | link_info->keep_memory); |
| 1122 | if (internal_relocs == NULL) |
| 1123 | goto error_return; |
| 1124 | |
| 1125 | /* Make sure the stac.rela stuff gets read in. */ |
| 1126 | stab = bfd_get_section_by_name (abfd, ".stab"); |
| 1127 | |
| 1128 | if (stab) |
| 1129 | { |
| 1130 | /* So stab does exits. */ |
| 1131 | Elf_Internal_Rela * irelbase; |
| 1132 | |
| 1133 | irelbase = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL, |
| 1134 | link_info->keep_memory); |
| 1135 | } |
| 1136 | |
| 1137 | /* Get section contents cached copy if it exists. */ |
| 1138 | if (contents == NULL) |
| 1139 | { |
| 1140 | /* Get cached copy if it exists. */ |
| 1141 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1142 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1143 | else |
| 1144 | { |
| 1145 | /* Go get them off disk. */ |
| 1146 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1147 | goto error_return; |
| 1148 | } |
| 1149 | } |
| 1150 | |
| 1151 | /* Read this BFD's symbols cached copy if it exists. */ |
| 1152 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| 1153 | { |
| 1154 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 1155 | if (isymbuf == NULL) |
| 1156 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| 1157 | symtab_hdr->sh_info, 0, |
| 1158 | NULL, NULL, NULL); |
| 1159 | if (isymbuf == NULL) |
| 1160 | goto error_return; |
| 1161 | } |
| 1162 | |
| 1163 | misc.symtab_hdr = symtab_hdr; |
| 1164 | misc.isymbuf = isymbuf; |
| 1165 | misc.irelbase = internal_relocs; |
| 1166 | misc.contents = contents; |
| 1167 | |
| 1168 | /* This is where all the relaxation actually get done. */ |
| 1169 | if ((pass == 1) || (new_pass && !changed)) |
| 1170 | { |
| 1171 | /* On the first pass we simply search for the lowest page that |
| 1172 | we havn't relaxed yet. Note that the pass count is reset |
| 1173 | each time a page is complete in order to move on to the next page. |
| 1174 | If we can't find any more pages then we are finished. */ |
| 1175 | if (new_pass) |
| 1176 | { |
| 1177 | pass = 1; |
| 1178 | new_pass = FALSE; |
| 1179 | changed = TRUE; /* Pre-initialize to break out of pass 1. */ |
| 1180 | search_addr = 0xFFFFFFFF; |
| 1181 | } |
| 1182 | |
| 1183 | if ((BASEADDR (sec) + sec->size < search_addr) |
| 1184 | && (BASEADDR (sec) + sec->size > page_end)) |
| 1185 | { |
| 1186 | if (BASEADDR (sec) <= page_end) |
| 1187 | search_addr = page_end + 1; |
| 1188 | else |
| 1189 | search_addr = BASEADDR (sec); |
| 1190 | |
| 1191 | /* Found a page => more work to do. */ |
| 1192 | *again = TRUE; |
| 1193 | } |
| 1194 | } |
| 1195 | else |
| 1196 | { |
| 1197 | if (new_pass) |
| 1198 | { |
| 1199 | new_pass = FALSE; |
| 1200 | changed = FALSE; |
| 1201 | page_start = PAGENO (search_addr); |
| 1202 | page_end = page_start | 0x00003FFF; |
| 1203 | } |
| 1204 | |
| 1205 | /* Only process sections in range. */ |
| 1206 | if ((BASEADDR (sec) + sec->size >= page_start) |
| 1207 | && (BASEADDR (sec) <= page_end)) |
| 1208 | { |
| 1209 | if (!ip2k_elf_relax_section_page (abfd, sec, &changed, &misc, page_start, page_end)) |
| 1210 | return FALSE; |
| 1211 | } |
| 1212 | *again = TRUE; |
| 1213 | } |
| 1214 | |
| 1215 | /* Perform some house keeping after relaxing the section. */ |
| 1216 | |
| 1217 | if (isymbuf != NULL |
| 1218 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1219 | { |
| 1220 | if (! link_info->keep_memory) |
| 1221 | free (isymbuf); |
| 1222 | else |
| 1223 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 1224 | } |
| 1225 | |
| 1226 | if (contents != NULL |
| 1227 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1228 | { |
| 1229 | if (! link_info->keep_memory) |
| 1230 | free (contents); |
| 1231 | else |
| 1232 | { |
| 1233 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1234 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | if (internal_relocs != NULL |
| 1239 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1240 | free (internal_relocs); |
| 1241 | |
| 1242 | return TRUE; |
| 1243 | |
| 1244 | error_return: |
| 1245 | if (isymbuf != NULL |
| 1246 | && symtab_hdr->contents != (unsigned char *) isymbuf) |
| 1247 | free (isymbuf); |
| 1248 | if (contents != NULL |
| 1249 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 1250 | free (contents); |
| 1251 | if (internal_relocs != NULL |
| 1252 | && elf_section_data (sec)->relocs != internal_relocs) |
| 1253 | free (internal_relocs); |
| 1254 | return FALSE; |
| 1255 | } |
| 1256 | |
| 1257 | /* Set the howto pointer for a IP2K ELF reloc. */ |
| 1258 | |
| 1259 | static void |
| 1260 | ip2k_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, |
| 1261 | arelent * cache_ptr, |
| 1262 | Elf_Internal_Rela * dst) |
| 1263 | { |
| 1264 | unsigned int r_type; |
| 1265 | |
| 1266 | r_type = ELF32_R_TYPE (dst->r_info); |
| 1267 | cache_ptr->howto = & ip2k_elf_howto_table [r_type]; |
| 1268 | } |
| 1269 | |
| 1270 | /* Perform a single relocation. |
| 1271 | By default we use the standard BFD routines. */ |
| 1272 | |
| 1273 | static bfd_reloc_status_type |
| 1274 | ip2k_final_link_relocate (reloc_howto_type * howto, |
| 1275 | bfd * input_bfd, |
| 1276 | asection * input_section, |
| 1277 | bfd_byte * contents, |
| 1278 | Elf_Internal_Rela * rel, |
| 1279 | bfd_vma relocation) |
| 1280 | { |
| 1281 | static bfd_vma page_addr = 0; |
| 1282 | |
| 1283 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 1284 | switch (howto->type) |
| 1285 | { |
| 1286 | /* Handle data space relocations. */ |
| 1287 | case R_IP2K_FR9: |
| 1288 | case R_IP2K_BANK: |
| 1289 | if ((relocation & IP2K_DATA_MASK) == IP2K_DATA_VALUE) |
| 1290 | relocation &= ~IP2K_DATA_MASK; |
| 1291 | else |
| 1292 | r = bfd_reloc_notsupported; |
| 1293 | break; |
| 1294 | |
| 1295 | case R_IP2K_LO8DATA: |
| 1296 | case R_IP2K_HI8DATA: |
| 1297 | case R_IP2K_EX8DATA: |
| 1298 | break; |
| 1299 | |
| 1300 | /* Handle insn space relocations. */ |
| 1301 | case R_IP2K_PAGE3: |
| 1302 | page_addr = BASEADDR (input_section) + rel->r_offset; |
| 1303 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1304 | relocation &= ~IP2K_INSN_MASK; |
| 1305 | else |
| 1306 | r = bfd_reloc_notsupported; |
| 1307 | break; |
| 1308 | |
| 1309 | case R_IP2K_ADDR16CJP: |
| 1310 | if (BASEADDR (input_section) + rel->r_offset != page_addr + 2) |
| 1311 | { |
| 1312 | /* No preceding page instruction, verify that it isn't needed. */ |
| 1313 | if (PAGENO (relocation + rel->r_addend) != |
| 1314 | ip2k_nominal_page_bits (input_bfd, input_section, |
| 1315 | rel->r_offset, contents)) |
| 1316 | _bfd_error_handler (_("ip2k linker: missing page instruction at 0x%08lx (dest = 0x%08lx)."), |
| 1317 | BASEADDR (input_section) + rel->r_offset, |
| 1318 | relocation + rel->r_addend); |
| 1319 | } |
| 1320 | else if (ip2k_relaxed) |
| 1321 | { |
| 1322 | /* Preceding page instruction. Verify that the page instruction is |
| 1323 | really needed. One reason for the relaxation to miss a page is if |
| 1324 | the section is not marked as executable. */ |
| 1325 | if (!ip2k_is_switch_table_128 (input_bfd, input_section, |
| 1326 | rel->r_offset - 2, contents) |
| 1327 | && !ip2k_is_switch_table_256 (input_bfd, input_section, |
| 1328 | rel->r_offset - 2, contents) |
| 1329 | && (PAGENO (relocation + rel->r_addend) == |
| 1330 | ip2k_nominal_page_bits (input_bfd, input_section, |
| 1331 | rel->r_offset - 2, contents))) |
| 1332 | _bfd_error_handler (_("ip2k linker: redundant page instruction at 0x%08lx (dest = 0x%08lx)."), |
| 1333 | page_addr, |
| 1334 | relocation + rel->r_addend); |
| 1335 | } |
| 1336 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1337 | relocation &= ~IP2K_INSN_MASK; |
| 1338 | else |
| 1339 | r = bfd_reloc_notsupported; |
| 1340 | break; |
| 1341 | |
| 1342 | case R_IP2K_LO8INSN: |
| 1343 | case R_IP2K_HI8INSN: |
| 1344 | case R_IP2K_PC_SKIP: |
| 1345 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1346 | relocation &= ~IP2K_INSN_MASK; |
| 1347 | else |
| 1348 | r = bfd_reloc_notsupported; |
| 1349 | break; |
| 1350 | |
| 1351 | case R_IP2K_16: |
| 1352 | /* If this is a relocation involving a TEXT |
| 1353 | symbol, reduce it to a word address. */ |
| 1354 | if ((relocation & IP2K_INSN_MASK) == IP2K_INSN_VALUE) |
| 1355 | howto = &ip2k_elf_howto_table[ (int) R_IP2K_TEXT]; |
| 1356 | break; |
| 1357 | |
| 1358 | /* Pass others through. */ |
| 1359 | default: |
| 1360 | break; |
| 1361 | } |
| 1362 | |
| 1363 | /* Only install relocation if above tests did not disqualify it. */ |
| 1364 | if (r == bfd_reloc_ok) |
| 1365 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 1366 | contents, rel->r_offset, |
| 1367 | relocation, rel->r_addend); |
| 1368 | |
| 1369 | return r; |
| 1370 | } |
| 1371 | |
| 1372 | /* Relocate a IP2K ELF section. |
| 1373 | |
| 1374 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 1375 | to handle the relocations for a section. |
| 1376 | |
| 1377 | The relocs are always passed as Rela structures; if the section |
| 1378 | actually uses Rel structures, the r_addend field will always be |
| 1379 | zero. |
| 1380 | |
| 1381 | This function is responsible for adjusting the section contents as |
| 1382 | necessary, and (if using Rela relocs and generating a relocatable |
| 1383 | output file) adjusting the reloc addend as necessary. |
| 1384 | |
| 1385 | This function does not have to worry about setting the reloc |
| 1386 | address or the reloc symbol index. |
| 1387 | |
| 1388 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 1389 | |
| 1390 | LOCAL_SECTIONS is an array giving the section in the input file |
| 1391 | corresponding to the st_shndx field of each local symbol. |
| 1392 | |
| 1393 | The global hash table entry for the global symbols can be found |
| 1394 | via elf_sym_hashes (input_bfd). |
| 1395 | |
| 1396 | When generating relocatable output, this function must handle |
| 1397 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 1398 | going to be the section symbol corresponding to the output |
| 1399 | section, which means that the addend must be adjusted |
| 1400 | accordingly. */ |
| 1401 | |
| 1402 | static bfd_boolean |
| 1403 | ip2k_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1404 | struct bfd_link_info *info, |
| 1405 | bfd *input_bfd, |
| 1406 | asection *input_section, |
| 1407 | bfd_byte *contents, |
| 1408 | Elf_Internal_Rela *relocs, |
| 1409 | Elf_Internal_Sym *local_syms, |
| 1410 | asection **local_sections) |
| 1411 | { |
| 1412 | Elf_Internal_Shdr *symtab_hdr; |
| 1413 | struct elf_link_hash_entry **sym_hashes; |
| 1414 | Elf_Internal_Rela *rel; |
| 1415 | Elf_Internal_Rela *relend; |
| 1416 | |
| 1417 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 1418 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1419 | relend = relocs + input_section->reloc_count; |
| 1420 | |
| 1421 | for (rel = relocs; rel < relend; rel ++) |
| 1422 | { |
| 1423 | reloc_howto_type * howto; |
| 1424 | unsigned long r_symndx; |
| 1425 | Elf_Internal_Sym * sym; |
| 1426 | asection * sec; |
| 1427 | struct elf_link_hash_entry * h; |
| 1428 | bfd_vma relocation; |
| 1429 | bfd_reloc_status_type r; |
| 1430 | const char * name = NULL; |
| 1431 | int r_type; |
| 1432 | |
| 1433 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1434 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1435 | howto = ip2k_elf_howto_table + ELF32_R_TYPE (rel->r_info); |
| 1436 | h = NULL; |
| 1437 | sym = NULL; |
| 1438 | sec = NULL; |
| 1439 | |
| 1440 | if (r_symndx < symtab_hdr->sh_info) |
| 1441 | { |
| 1442 | sym = local_syms + r_symndx; |
| 1443 | sec = local_sections [r_symndx]; |
| 1444 | relocation = BASEADDR (sec) + sym->st_value; |
| 1445 | |
| 1446 | name = bfd_elf_string_from_elf_section |
| 1447 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 1448 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 1449 | } |
| 1450 | else |
| 1451 | { |
| 1452 | bfd_boolean warned; |
| 1453 | bfd_boolean unresolved_reloc; |
| 1454 | |
| 1455 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 1456 | r_symndx, symtab_hdr, sym_hashes, |
| 1457 | h, sec, relocation, |
| 1458 | unresolved_reloc, warned); |
| 1459 | |
| 1460 | name = h->root.root.string; |
| 1461 | } |
| 1462 | |
| 1463 | if (sec != NULL && elf_discarded_section (sec)) |
| 1464 | { |
| 1465 | /* For relocs against symbols from removed linkonce sections, |
| 1466 | or sections discarded by a linker script, we just want the |
| 1467 | section contents zeroed. Avoid any special processing. */ |
| 1468 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 1469 | rel->r_info = 0; |
| 1470 | rel->r_addend = 0; |
| 1471 | continue; |
| 1472 | } |
| 1473 | |
| 1474 | if (info->relocatable) |
| 1475 | continue; |
| 1476 | |
| 1477 | /* Finally, the sole IP2K-specific part. */ |
| 1478 | r = ip2k_final_link_relocate (howto, input_bfd, input_section, |
| 1479 | contents, rel, relocation); |
| 1480 | |
| 1481 | if (r != bfd_reloc_ok) |
| 1482 | { |
| 1483 | const char * msg = NULL; |
| 1484 | |
| 1485 | switch (r) |
| 1486 | { |
| 1487 | case bfd_reloc_overflow: |
| 1488 | r = info->callbacks->reloc_overflow |
| 1489 | (info, (h ? &h->root : NULL), name, howto->name, |
| 1490 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 1491 | break; |
| 1492 | |
| 1493 | case bfd_reloc_undefined: |
| 1494 | r = info->callbacks->undefined_symbol |
| 1495 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
| 1496 | break; |
| 1497 | |
| 1498 | case bfd_reloc_outofrange: |
| 1499 | msg = _("internal error: out of range error"); |
| 1500 | break; |
| 1501 | |
| 1502 | /* This is how ip2k_final_link_relocate tells us of a non-kosher |
| 1503 | reference between insn & data address spaces. */ |
| 1504 | case bfd_reloc_notsupported: |
| 1505 | if (sym != NULL) /* Only if it's not an unresolved symbol. */ |
| 1506 | msg = _("unsupported relocation between data/insn address spaces"); |
| 1507 | break; |
| 1508 | |
| 1509 | case bfd_reloc_dangerous: |
| 1510 | msg = _("internal error: dangerous relocation"); |
| 1511 | break; |
| 1512 | |
| 1513 | default: |
| 1514 | msg = _("internal error: unknown error"); |
| 1515 | break; |
| 1516 | } |
| 1517 | |
| 1518 | if (msg) |
| 1519 | r = info->callbacks->warning |
| 1520 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 1521 | |
| 1522 | if (! r) |
| 1523 | return FALSE; |
| 1524 | } |
| 1525 | } |
| 1526 | |
| 1527 | return TRUE; |
| 1528 | } |
| 1529 | |
| 1530 | #define TARGET_BIG_SYM bfd_elf32_ip2k_vec |
| 1531 | #define TARGET_BIG_NAME "elf32-ip2k" |
| 1532 | |
| 1533 | #define ELF_ARCH bfd_arch_ip2k |
| 1534 | #define ELF_MACHINE_CODE EM_IP2K |
| 1535 | #define ELF_MACHINE_ALT1 EM_IP2K_OLD |
| 1536 | #define ELF_MAXPAGESIZE 1 /* No pages on the IP2K. */ |
| 1537 | |
| 1538 | #define elf_info_to_howto_rel NULL |
| 1539 | #define elf_info_to_howto ip2k_info_to_howto_rela |
| 1540 | |
| 1541 | #define elf_backend_can_gc_sections 1 |
| 1542 | #define elf_backend_rela_normal 1 |
| 1543 | #define elf_backend_relocate_section ip2k_elf_relocate_section |
| 1544 | |
| 1545 | #define elf_symbol_leading_char '_' |
| 1546 | #define bfd_elf32_bfd_reloc_type_lookup ip2k_reloc_type_lookup |
| 1547 | #define bfd_elf32_bfd_reloc_name_lookup ip2k_reloc_name_lookup |
| 1548 | #define bfd_elf32_bfd_relax_section ip2k_elf_relax_section |
| 1549 | |
| 1550 | #include "elf32-target.h" |