| 1 | /* BFD back-end for MIPS Extended-Coff files. |
| 2 | Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc. |
| 3 | Original version by Per Bothner. |
| 4 | Full support added by Ian Lance Taylor, ian@cygnus.com. |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "coff/internal.h" |
| 27 | #include "coff/sym.h" |
| 28 | #include "coff/symconst.h" |
| 29 | #include "coff/ecoff.h" |
| 30 | #include "coff/mips.h" |
| 31 | #include "libcoff.h" |
| 32 | #include "libecoff.h" |
| 33 | \f |
| 34 | /* Prototypes for static functions. */ |
| 35 | |
| 36 | static boolean mips_ecoff_bad_format_hook PARAMS ((bfd *abfd, PTR filehdr)); |
| 37 | static void mips_ecoff_swap_reloc_in PARAMS ((bfd *, PTR, |
| 38 | struct internal_reloc *)); |
| 39 | static void mips_ecoff_swap_reloc_out PARAMS ((bfd *, |
| 40 | const struct internal_reloc *, |
| 41 | PTR)); |
| 42 | static void mips_adjust_reloc_in PARAMS ((bfd *, |
| 43 | const struct internal_reloc *, |
| 44 | arelent *)); |
| 45 | static void mips_adjust_reloc_out PARAMS ((bfd *, const arelent *, |
| 46 | struct internal_reloc *)); |
| 47 | static bfd_reloc_status_type mips_generic_reloc PARAMS ((bfd *abfd, |
| 48 | arelent *reloc, |
| 49 | asymbol *symbol, |
| 50 | PTR data, |
| 51 | asection *section, |
| 52 | bfd *output_bfd, |
| 53 | char **error)); |
| 54 | static bfd_reloc_status_type mips_refhi_reloc PARAMS ((bfd *abfd, |
| 55 | arelent *reloc, |
| 56 | asymbol *symbol, |
| 57 | PTR data, |
| 58 | asection *section, |
| 59 | bfd *output_bfd, |
| 60 | char **error)); |
| 61 | static bfd_reloc_status_type mips_reflo_reloc PARAMS ((bfd *abfd, |
| 62 | arelent *reloc, |
| 63 | asymbol *symbol, |
| 64 | PTR data, |
| 65 | asection *section, |
| 66 | bfd *output_bfd, |
| 67 | char **error)); |
| 68 | static bfd_reloc_status_type mips_gprel_reloc PARAMS ((bfd *abfd, |
| 69 | arelent *reloc, |
| 70 | asymbol *symbol, |
| 71 | PTR data, |
| 72 | asection *section, |
| 73 | bfd *output_bfd, |
| 74 | char **error)); |
| 75 | static bfd_reloc_status_type mips_relhi_reloc PARAMS ((bfd *abfd, |
| 76 | arelent *reloc, |
| 77 | asymbol *symbol, |
| 78 | PTR data, |
| 79 | asection *section, |
| 80 | bfd *output_bfd, |
| 81 | char **error)); |
| 82 | static bfd_reloc_status_type mips_rello_reloc PARAMS ((bfd *abfd, |
| 83 | arelent *reloc, |
| 84 | asymbol *symbol, |
| 85 | PTR data, |
| 86 | asection *section, |
| 87 | bfd *output_bfd, |
| 88 | char **error)); |
| 89 | static bfd_reloc_status_type mips_switch_reloc PARAMS ((bfd *abfd, |
| 90 | arelent *reloc, |
| 91 | asymbol *symbol, |
| 92 | PTR data, |
| 93 | asection *section, |
| 94 | bfd *output_bfd, |
| 95 | char **error)); |
| 96 | static void mips_relocate_hi PARAMS ((struct internal_reloc *refhi, |
| 97 | struct internal_reloc *reflo, |
| 98 | bfd *input_bfd, |
| 99 | asection *input_section, |
| 100 | bfd_byte *contents, |
| 101 | size_t adjust, |
| 102 | bfd_vma relocation, |
| 103 | boolean pcrel)); |
| 104 | static boolean mips_relocate_section PARAMS ((bfd *, struct bfd_link_info *, |
| 105 | bfd *, asection *, |
| 106 | bfd_byte *, PTR)); |
| 107 | static boolean mips_relax_section PARAMS ((bfd *, asection *, |
| 108 | struct bfd_link_info *, |
| 109 | boolean *)); |
| 110 | static boolean mips_relax_pcrel16 PARAMS ((struct bfd_link_info *, bfd *, |
| 111 | asection *, |
| 112 | struct ecoff_link_hash_entry *, |
| 113 | bfd_byte *, bfd_vma)); |
| 114 | \f |
| 115 | /* ECOFF has COFF sections, but the debugging information is stored in |
| 116 | a completely different format. ECOFF targets use some of the |
| 117 | swapping routines from coffswap.h, and some of the generic COFF |
| 118 | routines in coffgen.c, but, unlike the real COFF targets, do not |
| 119 | use coffcode.h itself. |
| 120 | |
| 121 | Get the generic COFF swapping routines, except for the reloc, |
| 122 | symbol, and lineno ones. Give them ECOFF names. */ |
| 123 | #define MIPSECOFF |
| 124 | #define NO_COFF_RELOCS |
| 125 | #define NO_COFF_SYMBOLS |
| 126 | #define NO_COFF_LINENOS |
| 127 | #define coff_swap_filehdr_in mips_ecoff_swap_filehdr_in |
| 128 | #define coff_swap_filehdr_out mips_ecoff_swap_filehdr_out |
| 129 | #define coff_swap_aouthdr_in mips_ecoff_swap_aouthdr_in |
| 130 | #define coff_swap_aouthdr_out mips_ecoff_swap_aouthdr_out |
| 131 | #define coff_swap_scnhdr_in mips_ecoff_swap_scnhdr_in |
| 132 | #define coff_swap_scnhdr_out mips_ecoff_swap_scnhdr_out |
| 133 | #include "coffswap.h" |
| 134 | |
| 135 | /* Get the ECOFF swapping routines. */ |
| 136 | #define ECOFF_32 |
| 137 | #include "ecoffswap.h" |
| 138 | \f |
| 139 | /* How to process the various relocs types. */ |
| 140 | |
| 141 | static reloc_howto_type mips_howto_table[] = |
| 142 | { |
| 143 | /* Reloc type 0 is ignored. The reloc reading code ensures that |
| 144 | this is a reference to the .abs section, which will cause |
| 145 | bfd_perform_relocation to do nothing. */ |
| 146 | HOWTO (MIPS_R_IGNORE, /* type */ |
| 147 | 0, /* rightshift */ |
| 148 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 149 | 8, /* bitsize */ |
| 150 | false, /* pc_relative */ |
| 151 | 0, /* bitpos */ |
| 152 | complain_overflow_dont, /* complain_on_overflow */ |
| 153 | 0, /* special_function */ |
| 154 | "IGNORE", /* name */ |
| 155 | false, /* partial_inplace */ |
| 156 | 0, /* src_mask */ |
| 157 | 0, /* dst_mask */ |
| 158 | false), /* pcrel_offset */ |
| 159 | |
| 160 | /* A 16 bit reference to a symbol, normally from a data section. */ |
| 161 | HOWTO (MIPS_R_REFHALF, /* type */ |
| 162 | 0, /* rightshift */ |
| 163 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 164 | 16, /* bitsize */ |
| 165 | false, /* pc_relative */ |
| 166 | 0, /* bitpos */ |
| 167 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 168 | mips_generic_reloc, /* special_function */ |
| 169 | "REFHALF", /* name */ |
| 170 | true, /* partial_inplace */ |
| 171 | 0xffff, /* src_mask */ |
| 172 | 0xffff, /* dst_mask */ |
| 173 | false), /* pcrel_offset */ |
| 174 | |
| 175 | /* A 32 bit reference to a symbol, normally from a data section. */ |
| 176 | HOWTO (MIPS_R_REFWORD, /* type */ |
| 177 | 0, /* rightshift */ |
| 178 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 179 | 32, /* bitsize */ |
| 180 | false, /* pc_relative */ |
| 181 | 0, /* bitpos */ |
| 182 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 183 | mips_generic_reloc, /* special_function */ |
| 184 | "REFWORD", /* name */ |
| 185 | true, /* partial_inplace */ |
| 186 | 0xffffffff, /* src_mask */ |
| 187 | 0xffffffff, /* dst_mask */ |
| 188 | false), /* pcrel_offset */ |
| 189 | |
| 190 | /* A 26 bit absolute jump address. */ |
| 191 | HOWTO (MIPS_R_JMPADDR, /* type */ |
| 192 | 2, /* rightshift */ |
| 193 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 194 | 26, /* bitsize */ |
| 195 | false, /* pc_relative */ |
| 196 | 0, /* bitpos */ |
| 197 | complain_overflow_dont, /* complain_on_overflow */ |
| 198 | /* This needs complex overflow |
| 199 | detection, because the upper four |
| 200 | bits must match the PC. */ |
| 201 | mips_generic_reloc, /* special_function */ |
| 202 | "JMPADDR", /* name */ |
| 203 | true, /* partial_inplace */ |
| 204 | 0x3ffffff, /* src_mask */ |
| 205 | 0x3ffffff, /* dst_mask */ |
| 206 | false), /* pcrel_offset */ |
| 207 | |
| 208 | /* The high 16 bits of a symbol value. Handled by the function |
| 209 | mips_refhi_reloc. */ |
| 210 | HOWTO (MIPS_R_REFHI, /* type */ |
| 211 | 16, /* rightshift */ |
| 212 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 213 | 16, /* bitsize */ |
| 214 | false, /* pc_relative */ |
| 215 | 0, /* bitpos */ |
| 216 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 217 | mips_refhi_reloc, /* special_function */ |
| 218 | "REFHI", /* name */ |
| 219 | true, /* partial_inplace */ |
| 220 | 0xffff, /* src_mask */ |
| 221 | 0xffff, /* dst_mask */ |
| 222 | false), /* pcrel_offset */ |
| 223 | |
| 224 | /* The low 16 bits of a symbol value. */ |
| 225 | HOWTO (MIPS_R_REFLO, /* type */ |
| 226 | 0, /* rightshift */ |
| 227 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 228 | 16, /* bitsize */ |
| 229 | false, /* pc_relative */ |
| 230 | 0, /* bitpos */ |
| 231 | complain_overflow_dont, /* complain_on_overflow */ |
| 232 | mips_reflo_reloc, /* special_function */ |
| 233 | "REFLO", /* name */ |
| 234 | true, /* partial_inplace */ |
| 235 | 0xffff, /* src_mask */ |
| 236 | 0xffff, /* dst_mask */ |
| 237 | false), /* pcrel_offset */ |
| 238 | |
| 239 | /* A reference to an offset from the gp register. Handled by the |
| 240 | function mips_gprel_reloc. */ |
| 241 | HOWTO (MIPS_R_GPREL, /* type */ |
| 242 | 0, /* rightshift */ |
| 243 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 244 | 16, /* bitsize */ |
| 245 | false, /* pc_relative */ |
| 246 | 0, /* bitpos */ |
| 247 | complain_overflow_signed, /* complain_on_overflow */ |
| 248 | mips_gprel_reloc, /* special_function */ |
| 249 | "GPREL", /* name */ |
| 250 | true, /* partial_inplace */ |
| 251 | 0xffff, /* src_mask */ |
| 252 | 0xffff, /* dst_mask */ |
| 253 | false), /* pcrel_offset */ |
| 254 | |
| 255 | /* A reference to a literal using an offset from the gp register. |
| 256 | Handled by the function mips_gprel_reloc. */ |
| 257 | HOWTO (MIPS_R_LITERAL, /* type */ |
| 258 | 0, /* rightshift */ |
| 259 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 260 | 16, /* bitsize */ |
| 261 | false, /* pc_relative */ |
| 262 | 0, /* bitpos */ |
| 263 | complain_overflow_signed, /* complain_on_overflow */ |
| 264 | mips_gprel_reloc, /* special_function */ |
| 265 | "LITERAL", /* name */ |
| 266 | true, /* partial_inplace */ |
| 267 | 0xffff, /* src_mask */ |
| 268 | 0xffff, /* dst_mask */ |
| 269 | false), /* pcrel_offset */ |
| 270 | |
| 271 | { 8 }, |
| 272 | { 9 }, |
| 273 | { 10 }, |
| 274 | { 11 }, |
| 275 | |
| 276 | /* This reloc is a Cygnus extension used when generating position |
| 277 | independent code for embedded systems. It represents a 16 bit PC |
| 278 | relative reloc rightshifted twice as used in the MIPS branch |
| 279 | instructions. */ |
| 280 | HOWTO (MIPS_R_PCREL16, /* type */ |
| 281 | 2, /* rightshift */ |
| 282 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 283 | 16, /* bitsize */ |
| 284 | true, /* pc_relative */ |
| 285 | 0, /* bitpos */ |
| 286 | complain_overflow_signed, /* complain_on_overflow */ |
| 287 | mips_generic_reloc, /* special_function */ |
| 288 | "PCREL16", /* name */ |
| 289 | true, /* partial_inplace */ |
| 290 | 0xffff, /* src_mask */ |
| 291 | 0xffff, /* dst_mask */ |
| 292 | true), /* pcrel_offset */ |
| 293 | |
| 294 | /* This reloc is a Cygnus extension used when generating position |
| 295 | independent code for embedded systems. It represents the high 16 |
| 296 | bits of a PC relative reloc. The next reloc must be |
| 297 | MIPS_R_RELLO, and the addend is formed from the addends of the |
| 298 | two instructions, just as in MIPS_R_REFHI and MIPS_R_REFLO. The |
| 299 | final value is actually PC relative to the location of the |
| 300 | MIPS_R_RELLO reloc, not the MIPS_R_RELHI reloc. */ |
| 301 | HOWTO (MIPS_R_RELHI, /* type */ |
| 302 | 16, /* rightshift */ |
| 303 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 304 | 16, /* bitsize */ |
| 305 | true, /* pc_relative */ |
| 306 | 0, /* bitpos */ |
| 307 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 308 | mips_relhi_reloc, /* special_function */ |
| 309 | "RELHI", /* name */ |
| 310 | true, /* partial_inplace */ |
| 311 | 0xffff, /* src_mask */ |
| 312 | 0xffff, /* dst_mask */ |
| 313 | true), /* pcrel_offset */ |
| 314 | |
| 315 | /* This reloc is a Cygnus extension used when generating position |
| 316 | independent code for embedded systems. It represents the low 16 |
| 317 | bits of a PC relative reloc. */ |
| 318 | HOWTO (MIPS_R_RELLO, /* type */ |
| 319 | 0, /* rightshift */ |
| 320 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 321 | 16, /* bitsize */ |
| 322 | true, /* pc_relative */ |
| 323 | 0, /* bitpos */ |
| 324 | complain_overflow_dont, /* complain_on_overflow */ |
| 325 | mips_rello_reloc, /* special_function */ |
| 326 | "RELLO", /* name */ |
| 327 | true, /* partial_inplace */ |
| 328 | 0xffff, /* src_mask */ |
| 329 | 0xffff, /* dst_mask */ |
| 330 | true), /* pcrel_offset */ |
| 331 | |
| 332 | { 15 }, |
| 333 | { 16 }, |
| 334 | { 17 }, |
| 335 | { 18 }, |
| 336 | { 19 }, |
| 337 | { 20 }, |
| 338 | { 21 }, |
| 339 | |
| 340 | /* This reloc is a Cygnus extension used when generating position |
| 341 | independent code for embedded systems. It represents an entry in |
| 342 | a switch table, which is the difference between two symbols in |
| 343 | the .text section. The symndx is actually the offset from the |
| 344 | reloc address to the subtrahend. See include/coff/mips.h for |
| 345 | more details. */ |
| 346 | HOWTO (MIPS_R_SWITCH, /* type */ |
| 347 | 0, /* rightshift */ |
| 348 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 349 | 32, /* bitsize */ |
| 350 | true, /* pc_relative */ |
| 351 | 0, /* bitpos */ |
| 352 | complain_overflow_dont, /* complain_on_overflow */ |
| 353 | mips_switch_reloc, /* special_function */ |
| 354 | "SWITCH", /* name */ |
| 355 | true, /* partial_inplace */ |
| 356 | 0xffffffff, /* src_mask */ |
| 357 | 0xffffffff, /* dst_mask */ |
| 358 | true) /* pcrel_offset */ |
| 359 | }; |
| 360 | |
| 361 | #define MIPS_HOWTO_COUNT \ |
| 362 | (sizeof mips_howto_table / sizeof mips_howto_table[0]) |
| 363 | |
| 364 | /* When the linker is doing relaxing, it may change a external PCREL16 |
| 365 | reloc. This typically represents an instruction like |
| 366 | bal foo |
| 367 | We change it to |
| 368 | .set noreorder |
| 369 | bal $L1 |
| 370 | lui $at,%hi(foo - $L1) |
| 371 | $L1: |
| 372 | addiu $at,%lo(foo - $L1) |
| 373 | addu $at,$at,$31 |
| 374 | jalr $at |
| 375 | PCREL16_EXPANSION_ADJUSTMENT is the number of bytes this changes the |
| 376 | instruction by. */ |
| 377 | |
| 378 | #define PCREL16_EXPANSION_ADJUSTMENT (4 * 4) |
| 379 | \f |
| 380 | /* See whether the magic number matches. */ |
| 381 | |
| 382 | static boolean |
| 383 | mips_ecoff_bad_format_hook (abfd, filehdr) |
| 384 | bfd *abfd; |
| 385 | PTR filehdr; |
| 386 | { |
| 387 | struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; |
| 388 | |
| 389 | switch (internal_f->f_magic) |
| 390 | { |
| 391 | case MIPS_MAGIC_1: |
| 392 | /* I don't know what endianness this implies. */ |
| 393 | return true; |
| 394 | |
| 395 | case MIPS_MAGIC_BIG: |
| 396 | case MIPS_MAGIC_BIG2: |
| 397 | case MIPS_MAGIC_BIG3: |
| 398 | return abfd->xvec->byteorder_big_p; |
| 399 | |
| 400 | case MIPS_MAGIC_LITTLE: |
| 401 | case MIPS_MAGIC_LITTLE2: |
| 402 | case MIPS_MAGIC_LITTLE3: |
| 403 | return abfd->xvec->byteorder_big_p == false; |
| 404 | |
| 405 | default: |
| 406 | return false; |
| 407 | } |
| 408 | } |
| 409 | \f |
| 410 | /* Reloc handling. MIPS ECOFF relocs are packed into 8 bytes in |
| 411 | external form. They use a bit which indicates whether the symbol |
| 412 | is external. */ |
| 413 | |
| 414 | /* Swap a reloc in. */ |
| 415 | |
| 416 | static void |
| 417 | mips_ecoff_swap_reloc_in (abfd, ext_ptr, intern) |
| 418 | bfd *abfd; |
| 419 | PTR ext_ptr; |
| 420 | struct internal_reloc *intern; |
| 421 | { |
| 422 | const RELOC *ext = (RELOC *) ext_ptr; |
| 423 | |
| 424 | intern->r_vaddr = bfd_h_get_32 (abfd, (bfd_byte *) ext->r_vaddr); |
| 425 | if (abfd->xvec->header_byteorder_big_p != false) |
| 426 | { |
| 427 | intern->r_symndx = (((int) ext->r_bits[0] |
| 428 | << RELOC_BITS0_SYMNDX_SH_LEFT_BIG) |
| 429 | | ((int) ext->r_bits[1] |
| 430 | << RELOC_BITS1_SYMNDX_SH_LEFT_BIG) |
| 431 | | ((int) ext->r_bits[2] |
| 432 | << RELOC_BITS2_SYMNDX_SH_LEFT_BIG)); |
| 433 | intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_BIG) |
| 434 | >> RELOC_BITS3_TYPE_SH_BIG); |
| 435 | intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0; |
| 436 | } |
| 437 | else |
| 438 | { |
| 439 | intern->r_symndx = (((int) ext->r_bits[0] |
| 440 | << RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE) |
| 441 | | ((int) ext->r_bits[1] |
| 442 | << RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE) |
| 443 | | ((int) ext->r_bits[2] |
| 444 | << RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE)); |
| 445 | intern->r_type = (((ext->r_bits[3] & RELOC_BITS3_TYPE_LITTLE) |
| 446 | >> RELOC_BITS3_TYPE_SH_LITTLE) |
| 447 | | ((ext->r_bits[3] & RELOC_BITS3_TYPEHI_LITTLE) |
| 448 | << RELOC_BITS3_TYPEHI_SH_LITTLE)); |
| 449 | intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0; |
| 450 | } |
| 451 | |
| 452 | /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or |
| 453 | MIPS_R_RELLO reloc, r_symndx is actually the offset from the |
| 454 | reloc address to the base of the difference (see |
| 455 | include/coff/mips.h for more details). We copy symndx into the |
| 456 | r_offset field so as not to confuse ecoff_slurp_reloc_table in |
| 457 | ecoff.c. In adjust_reloc_in we then copy r_offset into the reloc |
| 458 | addend. */ |
| 459 | if (intern->r_type == MIPS_R_SWITCH |
| 460 | || (! intern->r_extern |
| 461 | && (intern->r_type == MIPS_R_RELLO |
| 462 | || intern->r_type == MIPS_R_RELHI))) |
| 463 | { |
| 464 | BFD_ASSERT (! intern->r_extern); |
| 465 | intern->r_offset = intern->r_symndx; |
| 466 | if (intern->r_offset & 0x800000) |
| 467 | intern->r_offset -= 0x1000000; |
| 468 | intern->r_symndx = RELOC_SECTION_TEXT; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | /* Swap a reloc out. */ |
| 473 | |
| 474 | static void |
| 475 | mips_ecoff_swap_reloc_out (abfd, intern, dst) |
| 476 | bfd *abfd; |
| 477 | const struct internal_reloc *intern; |
| 478 | PTR dst; |
| 479 | { |
| 480 | RELOC *ext = (RELOC *) dst; |
| 481 | long r_symndx; |
| 482 | |
| 483 | BFD_ASSERT (intern->r_extern |
| 484 | || (intern->r_symndx >= 0 && intern->r_symndx <= 12)); |
| 485 | |
| 486 | /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELLO or |
| 487 | MIPS_R_RELHI reloc, we actually want to write the contents of |
| 488 | r_offset out as the symbol index. This undoes the change made by |
| 489 | mips_ecoff_swap_reloc_in. */ |
| 490 | if (intern->r_type != MIPS_R_SWITCH |
| 491 | && (intern->r_extern |
| 492 | || (intern->r_type != MIPS_R_RELHI |
| 493 | && intern->r_type != MIPS_R_RELLO))) |
| 494 | r_symndx = intern->r_symndx; |
| 495 | else |
| 496 | { |
| 497 | BFD_ASSERT (intern->r_symndx == RELOC_SECTION_TEXT); |
| 498 | r_symndx = intern->r_offset & 0xffffff; |
| 499 | } |
| 500 | |
| 501 | bfd_h_put_32 (abfd, intern->r_vaddr, (bfd_byte *) ext->r_vaddr); |
| 502 | if (abfd->xvec->header_byteorder_big_p != false) |
| 503 | { |
| 504 | ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_BIG; |
| 505 | ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_BIG; |
| 506 | ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_BIG; |
| 507 | ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_BIG) |
| 508 | & RELOC_BITS3_TYPE_BIG) |
| 509 | | (intern->r_extern ? RELOC_BITS3_EXTERN_BIG : 0)); |
| 510 | } |
| 511 | else |
| 512 | { |
| 513 | ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE; |
| 514 | ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE; |
| 515 | ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE; |
| 516 | ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_LITTLE) |
| 517 | & RELOC_BITS3_TYPE_LITTLE) |
| 518 | | ((intern->r_type >> RELOC_BITS3_TYPEHI_SH_LITTLE |
| 519 | & RELOC_BITS3_TYPEHI_LITTLE)) |
| 520 | | (intern->r_extern ? RELOC_BITS3_EXTERN_LITTLE : 0)); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | /* Finish canonicalizing a reloc. Part of this is generic to all |
| 525 | ECOFF targets, and that part is in ecoff.c. The rest is done in |
| 526 | this backend routine. It must fill in the howto field. */ |
| 527 | |
| 528 | static void |
| 529 | mips_adjust_reloc_in (abfd, intern, rptr) |
| 530 | bfd *abfd; |
| 531 | const struct internal_reloc *intern; |
| 532 | arelent *rptr; |
| 533 | { |
| 534 | if (intern->r_type > MIPS_R_SWITCH) |
| 535 | abort (); |
| 536 | |
| 537 | if (! intern->r_extern |
| 538 | && (intern->r_type == MIPS_R_GPREL |
| 539 | || intern->r_type == MIPS_R_LITERAL)) |
| 540 | rptr->addend += ecoff_data (abfd)->gp; |
| 541 | |
| 542 | /* If the type is MIPS_R_IGNORE, make sure this is a reference to |
| 543 | the absolute section so that the reloc is ignored. */ |
| 544 | if (intern->r_type == MIPS_R_IGNORE) |
| 545 | rptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 546 | |
| 547 | /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or |
| 548 | MIPS_R_RELLO reloc, we want the addend field of the BFD relocto |
| 549 | hold the value which was originally in the symndx field of the |
| 550 | internal MIPS ECOFF reloc. This value was copied into |
| 551 | intern->r_offset by mips_swap_reloc_in, and here we copy it into |
| 552 | the addend field. */ |
| 553 | if (intern->r_type == MIPS_R_SWITCH |
| 554 | || (! intern->r_extern |
| 555 | && (intern->r_type == MIPS_R_RELHI |
| 556 | || intern->r_type == MIPS_R_RELLO))) |
| 557 | rptr->addend = intern->r_offset; |
| 558 | |
| 559 | rptr->howto = &mips_howto_table[intern->r_type]; |
| 560 | } |
| 561 | |
| 562 | /* Make any adjustments needed to a reloc before writing it out. None |
| 563 | are needed for MIPS. */ |
| 564 | |
| 565 | static void |
| 566 | mips_adjust_reloc_out (abfd, rel, intern) |
| 567 | bfd *abfd; |
| 568 | const arelent *rel; |
| 569 | struct internal_reloc *intern; |
| 570 | { |
| 571 | /* For a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or |
| 572 | MIPS_R_RELLO reloc, we must copy rel->addend into |
| 573 | intern->r_offset. This will then be written out as the symbol |
| 574 | index by mips_ecoff_swap_reloc_out. This operation parallels the |
| 575 | action of mips_adjust_reloc_in. */ |
| 576 | if (intern->r_type == MIPS_R_SWITCH |
| 577 | || (! intern->r_extern |
| 578 | && (intern->r_type == MIPS_R_RELHI |
| 579 | || intern->r_type == MIPS_R_RELLO))) |
| 580 | intern->r_offset = rel->addend; |
| 581 | } |
| 582 | |
| 583 | /* ECOFF relocs are either against external symbols, or against |
| 584 | sections. If we are producing relocateable output, and the reloc |
| 585 | is against an external symbol, and nothing has given us any |
| 586 | additional addend, the resulting reloc will also be against the |
| 587 | same symbol. In such a case, we don't want to change anything |
| 588 | about the way the reloc is handled, since it will all be done at |
| 589 | final link time. Rather than put special case code into |
| 590 | bfd_perform_relocation, all the reloc types use this howto |
| 591 | function. It just short circuits the reloc if producing |
| 592 | relocateable output against an external symbol. */ |
| 593 | |
| 594 | static bfd_reloc_status_type |
| 595 | mips_generic_reloc (abfd, |
| 596 | reloc_entry, |
| 597 | symbol, |
| 598 | data, |
| 599 | input_section, |
| 600 | output_bfd, |
| 601 | error_message) |
| 602 | bfd *abfd; |
| 603 | arelent *reloc_entry; |
| 604 | asymbol *symbol; |
| 605 | PTR data; |
| 606 | asection *input_section; |
| 607 | bfd *output_bfd; |
| 608 | char **error_message; |
| 609 | { |
| 610 | if (output_bfd != (bfd *) NULL |
| 611 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 612 | && reloc_entry->addend == 0) |
| 613 | { |
| 614 | reloc_entry->address += input_section->output_offset; |
| 615 | return bfd_reloc_ok; |
| 616 | } |
| 617 | |
| 618 | return bfd_reloc_continue; |
| 619 | } |
| 620 | |
| 621 | /* Do a REFHI relocation. This has to be done in combination with a |
| 622 | REFLO reloc, because there is a carry from the REFLO to the REFHI. |
| 623 | Here we just save the information we need; we do the actual |
| 624 | relocation when we see the REFLO. MIPS ECOFF requires that the |
| 625 | REFLO immediately follow the REFHI, so this ought to work. */ |
| 626 | |
| 627 | static bfd_byte *mips_refhi_addr; |
| 628 | static bfd_vma mips_refhi_addend; |
| 629 | |
| 630 | static bfd_reloc_status_type |
| 631 | mips_refhi_reloc (abfd, |
| 632 | reloc_entry, |
| 633 | symbol, |
| 634 | data, |
| 635 | input_section, |
| 636 | output_bfd, |
| 637 | error_message) |
| 638 | bfd *abfd; |
| 639 | arelent *reloc_entry; |
| 640 | asymbol *symbol; |
| 641 | PTR data; |
| 642 | asection *input_section; |
| 643 | bfd *output_bfd; |
| 644 | char **error_message; |
| 645 | { |
| 646 | bfd_reloc_status_type ret; |
| 647 | bfd_vma relocation; |
| 648 | |
| 649 | /* If we're relocating, and this an external symbol, we don't want |
| 650 | to change anything. */ |
| 651 | if (output_bfd != (bfd *) NULL |
| 652 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 653 | && reloc_entry->addend == 0) |
| 654 | { |
| 655 | reloc_entry->address += input_section->output_offset; |
| 656 | return bfd_reloc_ok; |
| 657 | } |
| 658 | |
| 659 | ret = bfd_reloc_ok; |
| 660 | if (bfd_is_und_section (symbol->section) |
| 661 | && output_bfd == (bfd *) NULL) |
| 662 | ret = bfd_reloc_undefined; |
| 663 | |
| 664 | if (bfd_is_com_section (symbol->section)) |
| 665 | relocation = 0; |
| 666 | else |
| 667 | relocation = symbol->value; |
| 668 | |
| 669 | relocation += symbol->section->output_section->vma; |
| 670 | relocation += symbol->section->output_offset; |
| 671 | relocation += reloc_entry->addend; |
| 672 | |
| 673 | if (reloc_entry->address > input_section->_cooked_size) |
| 674 | return bfd_reloc_outofrange; |
| 675 | |
| 676 | /* Save the information, and let REFLO do the actual relocation. */ |
| 677 | mips_refhi_addr = (bfd_byte *) data + reloc_entry->address; |
| 678 | mips_refhi_addend = relocation; |
| 679 | |
| 680 | if (output_bfd != (bfd *) NULL) |
| 681 | reloc_entry->address += input_section->output_offset; |
| 682 | |
| 683 | return ret; |
| 684 | } |
| 685 | |
| 686 | /* Do a REFLO relocation. This is a straightforward 16 bit inplace |
| 687 | relocation; this function exists in order to do the REFHI |
| 688 | relocation described above. */ |
| 689 | |
| 690 | static bfd_reloc_status_type |
| 691 | mips_reflo_reloc (abfd, |
| 692 | reloc_entry, |
| 693 | symbol, |
| 694 | data, |
| 695 | input_section, |
| 696 | output_bfd, |
| 697 | error_message) |
| 698 | bfd *abfd; |
| 699 | arelent *reloc_entry; |
| 700 | asymbol *symbol; |
| 701 | PTR data; |
| 702 | asection *input_section; |
| 703 | bfd *output_bfd; |
| 704 | char **error_message; |
| 705 | { |
| 706 | if (mips_refhi_addr != (bfd_byte *) NULL) |
| 707 | { |
| 708 | unsigned long insn; |
| 709 | unsigned long val; |
| 710 | unsigned long vallo; |
| 711 | |
| 712 | /* Do the REFHI relocation. Note that we actually don't need to |
| 713 | know anything about the REFLO itself, except where to find |
| 714 | the low 16 bits of the addend needed by the REFHI. */ |
| 715 | insn = bfd_get_32 (abfd, mips_refhi_addr); |
| 716 | vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address) |
| 717 | & 0xffff); |
| 718 | val = ((insn & 0xffff) << 16) + vallo; |
| 719 | val += mips_refhi_addend; |
| 720 | |
| 721 | /* The low order 16 bits are always treated as a signed value. |
| 722 | Therefore, a negative value in the low order bits requires an |
| 723 | adjustment in the high order bits. We need to make this |
| 724 | adjustment in two ways: once for the bits we took from the |
| 725 | data, and once for the bits we are putting back in to the |
| 726 | data. */ |
| 727 | if ((vallo & 0x8000) != 0) |
| 728 | val -= 0x10000; |
| 729 | if ((val & 0x8000) != 0) |
| 730 | val += 0x10000; |
| 731 | |
| 732 | insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); |
| 733 | bfd_put_32 (abfd, insn, mips_refhi_addr); |
| 734 | |
| 735 | mips_refhi_addr = (bfd_byte *) NULL; |
| 736 | } |
| 737 | |
| 738 | /* Now do the REFLO reloc in the usual way. */ |
| 739 | return mips_generic_reloc (abfd, reloc_entry, symbol, data, |
| 740 | input_section, output_bfd, error_message); |
| 741 | } |
| 742 | |
| 743 | /* Do a GPREL relocation. This is a 16 bit value which must become |
| 744 | the offset from the gp register. */ |
| 745 | |
| 746 | static bfd_reloc_status_type |
| 747 | mips_gprel_reloc (abfd, |
| 748 | reloc_entry, |
| 749 | symbol, |
| 750 | data, |
| 751 | input_section, |
| 752 | output_bfd, |
| 753 | error_message) |
| 754 | bfd *abfd; |
| 755 | arelent *reloc_entry; |
| 756 | asymbol *symbol; |
| 757 | PTR data; |
| 758 | asection *input_section; |
| 759 | bfd *output_bfd; |
| 760 | char **error_message; |
| 761 | { |
| 762 | boolean relocateable; |
| 763 | bfd_vma relocation; |
| 764 | unsigned long val; |
| 765 | unsigned long insn; |
| 766 | |
| 767 | /* If we're relocating, and this is an external symbol with no |
| 768 | addend, we don't want to change anything. We will only have an |
| 769 | addend if this is a newly created reloc, not read from an ECOFF |
| 770 | file. */ |
| 771 | if (output_bfd != (bfd *) NULL |
| 772 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 773 | && reloc_entry->addend == 0) |
| 774 | { |
| 775 | reloc_entry->address += input_section->output_offset; |
| 776 | return bfd_reloc_ok; |
| 777 | } |
| 778 | |
| 779 | if (output_bfd != (bfd *) NULL) |
| 780 | relocateable = true; |
| 781 | else |
| 782 | { |
| 783 | relocateable = false; |
| 784 | output_bfd = symbol->section->output_section->owner; |
| 785 | } |
| 786 | |
| 787 | if (bfd_is_und_section (symbol->section) |
| 788 | && relocateable == false) |
| 789 | return bfd_reloc_undefined; |
| 790 | |
| 791 | /* We have to figure out the gp value, so that we can adjust the |
| 792 | symbol value correctly. We look up the symbol _gp in the output |
| 793 | BFD. If we can't find it, we're stuck. We cache it in the ECOFF |
| 794 | target data. We don't need to adjust the symbol value for an |
| 795 | external symbol if we are producing relocateable output. */ |
| 796 | if (ecoff_data (output_bfd)->gp == 0 |
| 797 | && (relocateable == false |
| 798 | || (symbol->flags & BSF_SECTION_SYM) != 0)) |
| 799 | { |
| 800 | if (relocateable != false) |
| 801 | { |
| 802 | /* Make up a value. */ |
| 803 | ecoff_data (output_bfd)->gp = |
| 804 | symbol->section->output_section->vma + 0x4000; |
| 805 | } |
| 806 | else |
| 807 | { |
| 808 | unsigned int count; |
| 809 | asymbol **sym; |
| 810 | unsigned int i; |
| 811 | |
| 812 | count = bfd_get_symcount (output_bfd); |
| 813 | sym = bfd_get_outsymbols (output_bfd); |
| 814 | |
| 815 | if (sym == (asymbol **) NULL) |
| 816 | i = count; |
| 817 | else |
| 818 | { |
| 819 | for (i = 0; i < count; i++, sym++) |
| 820 | { |
| 821 | register CONST char *name; |
| 822 | |
| 823 | name = bfd_asymbol_name (*sym); |
| 824 | if (*name == '_' && strcmp (name, "_gp") == 0) |
| 825 | { |
| 826 | ecoff_data (output_bfd)->gp = bfd_asymbol_value (*sym); |
| 827 | break; |
| 828 | } |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | if (i >= count) |
| 833 | { |
| 834 | /* Only get the error once. */ |
| 835 | ecoff_data (output_bfd)->gp = 4; |
| 836 | *error_message = |
| 837 | (char *) "GP relative relocation when _gp not defined"; |
| 838 | return bfd_reloc_dangerous; |
| 839 | } |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | if (bfd_is_com_section (symbol->section)) |
| 844 | relocation = 0; |
| 845 | else |
| 846 | relocation = symbol->value; |
| 847 | |
| 848 | relocation += symbol->section->output_section->vma; |
| 849 | relocation += symbol->section->output_offset; |
| 850 | |
| 851 | if (reloc_entry->address > input_section->_cooked_size) |
| 852 | return bfd_reloc_outofrange; |
| 853 | |
| 854 | insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); |
| 855 | |
| 856 | /* Set val to the offset into the section or symbol. */ |
| 857 | val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff; |
| 858 | if (val & 0x8000) |
| 859 | val -= 0x10000; |
| 860 | |
| 861 | /* Adjust val for the final section location and GP value. If we |
| 862 | are producing relocateable output, we don't want to do this for |
| 863 | an external symbol. */ |
| 864 | if (relocateable == false |
| 865 | || (symbol->flags & BSF_SECTION_SYM) != 0) |
| 866 | val += relocation - ecoff_data (output_bfd)->gp; |
| 867 | |
| 868 | insn = (insn &~ 0xffff) | (val & 0xffff); |
| 869 | bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); |
| 870 | |
| 871 | if (relocateable != false) |
| 872 | reloc_entry->address += input_section->output_offset; |
| 873 | |
| 874 | /* Make sure it fit in 16 bits. */ |
| 875 | if (val >= 0x8000 && val < 0xffff8000) |
| 876 | return bfd_reloc_overflow; |
| 877 | |
| 878 | return bfd_reloc_ok; |
| 879 | } |
| 880 | |
| 881 | /* Do a RELHI relocation. We do this in conjunction with a RELLO |
| 882 | reloc, just as REFHI and REFLO are done together. RELHI and RELLO |
| 883 | are Cygnus extensions used when generating position independent |
| 884 | code for embedded systems. */ |
| 885 | |
| 886 | static bfd_byte *mips_relhi_addr; |
| 887 | static bfd_vma mips_relhi_addend; |
| 888 | |
| 889 | static bfd_reloc_status_type |
| 890 | mips_relhi_reloc (abfd, |
| 891 | reloc_entry, |
| 892 | symbol, |
| 893 | data, |
| 894 | input_section, |
| 895 | output_bfd, |
| 896 | error_message) |
| 897 | bfd *abfd; |
| 898 | arelent *reloc_entry; |
| 899 | asymbol *symbol; |
| 900 | PTR data; |
| 901 | asection *input_section; |
| 902 | bfd *output_bfd; |
| 903 | char **error_message; |
| 904 | { |
| 905 | bfd_reloc_status_type ret; |
| 906 | bfd_vma relocation; |
| 907 | |
| 908 | /* If this is a reloc against a section symbol, then it is correct |
| 909 | in the object file. The only time we want to change this case is |
| 910 | when we are relaxing, and that is handled entirely by |
| 911 | mips_relocate_section and never calls this function. */ |
| 912 | if ((symbol->flags & BSF_SECTION_SYM) != 0) |
| 913 | { |
| 914 | if (output_bfd != (bfd *) NULL) |
| 915 | reloc_entry->address += input_section->output_offset; |
| 916 | return bfd_reloc_ok; |
| 917 | } |
| 918 | |
| 919 | /* This is an external symbol. If we're relocating, we don't want |
| 920 | to change anything. */ |
| 921 | if (output_bfd != (bfd *) NULL) |
| 922 | { |
| 923 | reloc_entry->address += input_section->output_offset; |
| 924 | return bfd_reloc_ok; |
| 925 | } |
| 926 | |
| 927 | ret = bfd_reloc_ok; |
| 928 | if (bfd_is_und_section (symbol->section) |
| 929 | && output_bfd == (bfd *) NULL) |
| 930 | ret = bfd_reloc_undefined; |
| 931 | |
| 932 | if (bfd_is_com_section (symbol->section)) |
| 933 | relocation = 0; |
| 934 | else |
| 935 | relocation = symbol->value; |
| 936 | |
| 937 | relocation += symbol->section->output_section->vma; |
| 938 | relocation += symbol->section->output_offset; |
| 939 | relocation += reloc_entry->addend; |
| 940 | |
| 941 | if (reloc_entry->address > input_section->_cooked_size) |
| 942 | return bfd_reloc_outofrange; |
| 943 | |
| 944 | /* Save the information, and let RELLO do the actual relocation. */ |
| 945 | mips_relhi_addr = (bfd_byte *) data + reloc_entry->address; |
| 946 | mips_relhi_addend = relocation; |
| 947 | |
| 948 | if (output_bfd != (bfd *) NULL) |
| 949 | reloc_entry->address += input_section->output_offset; |
| 950 | |
| 951 | return ret; |
| 952 | } |
| 953 | |
| 954 | /* Do a RELLO relocation. This is a straightforward 16 bit PC |
| 955 | relative relocation; this function exists in order to do the RELHI |
| 956 | relocation described above. */ |
| 957 | |
| 958 | static bfd_reloc_status_type |
| 959 | mips_rello_reloc (abfd, |
| 960 | reloc_entry, |
| 961 | symbol, |
| 962 | data, |
| 963 | input_section, |
| 964 | output_bfd, |
| 965 | error_message) |
| 966 | bfd *abfd; |
| 967 | arelent *reloc_entry; |
| 968 | asymbol *symbol; |
| 969 | PTR data; |
| 970 | asection *input_section; |
| 971 | bfd *output_bfd; |
| 972 | char **error_message; |
| 973 | { |
| 974 | if (mips_relhi_addr != (bfd_byte *) NULL) |
| 975 | { |
| 976 | unsigned long insn; |
| 977 | unsigned long val; |
| 978 | unsigned long vallo; |
| 979 | |
| 980 | /* Do the RELHI relocation. Note that we actually don't need to |
| 981 | know anything about the RELLO itself, except where to find |
| 982 | the low 16 bits of the addend needed by the RELHI. */ |
| 983 | insn = bfd_get_32 (abfd, mips_relhi_addr); |
| 984 | vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address) |
| 985 | & 0xffff); |
| 986 | val = ((insn & 0xffff) << 16) + vallo; |
| 987 | val += mips_relhi_addend; |
| 988 | |
| 989 | /* If the symbol is defined, make val PC relative. If the |
| 990 | symbol is not defined we don't want to do this, because we |
| 991 | don't want the value in the object file to incorporate the |
| 992 | address of the reloc. */ |
| 993 | if (! bfd_is_und_section (bfd_get_section (symbol)) |
| 994 | && ! bfd_is_com_section (bfd_get_section (symbol))) |
| 995 | val -= (input_section->output_section->vma |
| 996 | + input_section->output_offset |
| 997 | + reloc_entry->address); |
| 998 | |
| 999 | /* The low order 16 bits are always treated as a signed value. |
| 1000 | Therefore, a negative value in the low order bits requires an |
| 1001 | adjustment in the high order bits. We need to make this |
| 1002 | adjustment in two ways: once for the bits we took from the |
| 1003 | data, and once for the bits we are putting back in to the |
| 1004 | data. */ |
| 1005 | if ((vallo & 0x8000) != 0) |
| 1006 | val -= 0x10000; |
| 1007 | if ((val & 0x8000) != 0) |
| 1008 | val += 0x10000; |
| 1009 | |
| 1010 | insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); |
| 1011 | bfd_put_32 (abfd, insn, mips_relhi_addr); |
| 1012 | |
| 1013 | mips_relhi_addr = (bfd_byte *) NULL; |
| 1014 | } |
| 1015 | |
| 1016 | /* If this is a reloc against a section symbol, then it is correct |
| 1017 | in the object file. The only time we want to change this case is |
| 1018 | when we are relaxing, and that is handled entirely by |
| 1019 | mips_relocate_section and never calls this function. */ |
| 1020 | if ((symbol->flags & BSF_SECTION_SYM) != 0) |
| 1021 | { |
| 1022 | if (output_bfd != (bfd *) NULL) |
| 1023 | reloc_entry->address += input_section->output_offset; |
| 1024 | return bfd_reloc_ok; |
| 1025 | } |
| 1026 | |
| 1027 | /* bfd_perform_relocation does not handle pcrel_offset relocations |
| 1028 | correctly when generating a relocateable file, so handle them |
| 1029 | directly here. */ |
| 1030 | if (output_bfd != (bfd *) NULL) |
| 1031 | { |
| 1032 | reloc_entry->address += input_section->output_offset; |
| 1033 | return bfd_reloc_ok; |
| 1034 | } |
| 1035 | |
| 1036 | /* Now do the RELLO reloc in the usual way. */ |
| 1037 | return mips_generic_reloc (abfd, reloc_entry, symbol, data, |
| 1038 | input_section, output_bfd, error_message); |
| 1039 | } |
| 1040 | |
| 1041 | /* This is the special function for the MIPS_R_SWITCH reloc. This |
| 1042 | special reloc is normally correct in the object file, and only |
| 1043 | requires special handling when relaxing. We don't want |
| 1044 | bfd_perform_relocation to tamper with it at all. */ |
| 1045 | |
| 1046 | /*ARGSUSED*/ |
| 1047 | static bfd_reloc_status_type |
| 1048 | mips_switch_reloc (abfd, |
| 1049 | reloc_entry, |
| 1050 | symbol, |
| 1051 | data, |
| 1052 | input_section, |
| 1053 | output_bfd, |
| 1054 | error_message) |
| 1055 | bfd *abfd; |
| 1056 | arelent *reloc_entry; |
| 1057 | asymbol *symbol; |
| 1058 | PTR data; |
| 1059 | asection *input_section; |
| 1060 | bfd *output_bfd; |
| 1061 | char **error_message; |
| 1062 | { |
| 1063 | return bfd_reloc_ok; |
| 1064 | } |
| 1065 | |
| 1066 | /* Get the howto structure for a generic reloc type. */ |
| 1067 | |
| 1068 | static CONST struct reloc_howto_struct * |
| 1069 | mips_bfd_reloc_type_lookup (abfd, code) |
| 1070 | bfd *abfd; |
| 1071 | bfd_reloc_code_real_type code; |
| 1072 | { |
| 1073 | int mips_type; |
| 1074 | |
| 1075 | switch (code) |
| 1076 | { |
| 1077 | case BFD_RELOC_16: |
| 1078 | mips_type = MIPS_R_REFHALF; |
| 1079 | break; |
| 1080 | case BFD_RELOC_32: |
| 1081 | case BFD_RELOC_CTOR: |
| 1082 | mips_type = MIPS_R_REFWORD; |
| 1083 | break; |
| 1084 | case BFD_RELOC_MIPS_JMP: |
| 1085 | mips_type = MIPS_R_JMPADDR; |
| 1086 | break; |
| 1087 | case BFD_RELOC_HI16_S: |
| 1088 | mips_type = MIPS_R_REFHI; |
| 1089 | break; |
| 1090 | case BFD_RELOC_LO16: |
| 1091 | mips_type = MIPS_R_REFLO; |
| 1092 | break; |
| 1093 | case BFD_RELOC_MIPS_GPREL: |
| 1094 | mips_type = MIPS_R_GPREL; |
| 1095 | break; |
| 1096 | case BFD_RELOC_MIPS_LITERAL: |
| 1097 | mips_type = MIPS_R_LITERAL; |
| 1098 | break; |
| 1099 | case BFD_RELOC_16_PCREL_S2: |
| 1100 | mips_type = MIPS_R_PCREL16; |
| 1101 | break; |
| 1102 | case BFD_RELOC_PCREL_HI16_S: |
| 1103 | mips_type = MIPS_R_RELHI; |
| 1104 | break; |
| 1105 | case BFD_RELOC_PCREL_LO16: |
| 1106 | mips_type = MIPS_R_RELLO; |
| 1107 | break; |
| 1108 | case BFD_RELOC_GPREL32: |
| 1109 | mips_type = MIPS_R_SWITCH; |
| 1110 | break; |
| 1111 | default: |
| 1112 | return (CONST struct reloc_howto_struct *) NULL; |
| 1113 | } |
| 1114 | |
| 1115 | return &mips_howto_table[mips_type]; |
| 1116 | } |
| 1117 | \f |
| 1118 | /* A helper routine for mips_relocate_section which handles the REFHI |
| 1119 | and RELHI relocations. The REFHI relocation must be followed by a |
| 1120 | REFLO relocation (and RELHI by a RELLO), and the addend used is |
| 1121 | formed from the addends of both instructions. */ |
| 1122 | |
| 1123 | static void |
| 1124 | mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents, adjust, |
| 1125 | relocation, pcrel) |
| 1126 | struct internal_reloc *refhi; |
| 1127 | struct internal_reloc *reflo; |
| 1128 | bfd *input_bfd; |
| 1129 | asection *input_section; |
| 1130 | bfd_byte *contents; |
| 1131 | size_t adjust; |
| 1132 | bfd_vma relocation; |
| 1133 | boolean pcrel; |
| 1134 | { |
| 1135 | unsigned long insn; |
| 1136 | unsigned long val; |
| 1137 | unsigned long vallo; |
| 1138 | |
| 1139 | insn = bfd_get_32 (input_bfd, |
| 1140 | contents + adjust + refhi->r_vaddr - input_section->vma); |
| 1141 | vallo = (bfd_get_32 (input_bfd, |
| 1142 | contents + adjust + reflo->r_vaddr - input_section->vma) |
| 1143 | & 0xffff); |
| 1144 | val = ((insn & 0xffff) << 16) + vallo; |
| 1145 | val += relocation; |
| 1146 | |
| 1147 | /* The low order 16 bits are always treated as a signed value. |
| 1148 | Therefore, a negative value in the low order bits requires an |
| 1149 | adjustment in the high order bits. We need to make this |
| 1150 | adjustment in two ways: once for the bits we took from the data, |
| 1151 | and once for the bits we are putting back in to the data. */ |
| 1152 | if ((vallo & 0x8000) != 0) |
| 1153 | val -= 0x10000; |
| 1154 | |
| 1155 | if (pcrel) |
| 1156 | val -= (input_section->output_section->vma |
| 1157 | + input_section->output_offset |
| 1158 | + (reflo->r_vaddr - input_section->vma + adjust)); |
| 1159 | |
| 1160 | if ((val & 0x8000) != 0) |
| 1161 | val += 0x10000; |
| 1162 | |
| 1163 | insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); |
| 1164 | bfd_put_32 (input_bfd, (bfd_vma) insn, |
| 1165 | contents + adjust + refhi->r_vaddr - input_section->vma); |
| 1166 | } |
| 1167 | |
| 1168 | /* Relocate a section while linking a MIPS ECOFF file. */ |
| 1169 | |
| 1170 | static boolean |
| 1171 | mips_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1172 | contents, external_relocs) |
| 1173 | bfd *output_bfd; |
| 1174 | struct bfd_link_info *info; |
| 1175 | bfd *input_bfd; |
| 1176 | asection *input_section; |
| 1177 | bfd_byte *contents; |
| 1178 | PTR external_relocs; |
| 1179 | { |
| 1180 | asection **symndx_to_section; |
| 1181 | struct ecoff_link_hash_entry **sym_hashes; |
| 1182 | bfd_vma gp; |
| 1183 | boolean gp_undefined; |
| 1184 | size_t adjust; |
| 1185 | long *offsets; |
| 1186 | struct external_reloc *ext_rel; |
| 1187 | struct external_reloc *ext_rel_end; |
| 1188 | unsigned int i; |
| 1189 | boolean got_lo; |
| 1190 | struct internal_reloc lo_int_rel; |
| 1191 | |
| 1192 | BFD_ASSERT (input_bfd->xvec->header_byteorder_big_p |
| 1193 | == output_bfd->xvec->header_byteorder_big_p); |
| 1194 | |
| 1195 | /* We keep a table mapping the symndx found in an internal reloc to |
| 1196 | the appropriate section. This is faster than looking up the |
| 1197 | section by name each time. */ |
| 1198 | symndx_to_section = ecoff_data (input_bfd)->symndx_to_section; |
| 1199 | if (symndx_to_section == (asection **) NULL) |
| 1200 | { |
| 1201 | symndx_to_section = ((asection **) |
| 1202 | bfd_alloc (input_bfd, |
| 1203 | (NUM_RELOC_SECTIONS |
| 1204 | * sizeof (asection *)))); |
| 1205 | if (!symndx_to_section) |
| 1206 | { |
| 1207 | bfd_set_error (bfd_error_no_memory); |
| 1208 | return false; |
| 1209 | } |
| 1210 | |
| 1211 | symndx_to_section[RELOC_SECTION_NONE] = NULL; |
| 1212 | symndx_to_section[RELOC_SECTION_TEXT] = |
| 1213 | bfd_get_section_by_name (input_bfd, ".text"); |
| 1214 | symndx_to_section[RELOC_SECTION_RDATA] = |
| 1215 | bfd_get_section_by_name (input_bfd, ".rdata"); |
| 1216 | symndx_to_section[RELOC_SECTION_DATA] = |
| 1217 | bfd_get_section_by_name (input_bfd, ".data"); |
| 1218 | symndx_to_section[RELOC_SECTION_SDATA] = |
| 1219 | bfd_get_section_by_name (input_bfd, ".sdata"); |
| 1220 | symndx_to_section[RELOC_SECTION_SBSS] = |
| 1221 | bfd_get_section_by_name (input_bfd, ".sbss"); |
| 1222 | symndx_to_section[RELOC_SECTION_BSS] = |
| 1223 | bfd_get_section_by_name (input_bfd, ".bss"); |
| 1224 | symndx_to_section[RELOC_SECTION_INIT] = |
| 1225 | bfd_get_section_by_name (input_bfd, ".init"); |
| 1226 | symndx_to_section[RELOC_SECTION_LIT8] = |
| 1227 | bfd_get_section_by_name (input_bfd, ".lit8"); |
| 1228 | symndx_to_section[RELOC_SECTION_LIT4] = |
| 1229 | bfd_get_section_by_name (input_bfd, ".lit4"); |
| 1230 | symndx_to_section[RELOC_SECTION_XDATA] = NULL; |
| 1231 | symndx_to_section[RELOC_SECTION_PDATA] = NULL; |
| 1232 | symndx_to_section[RELOC_SECTION_FINI] = |
| 1233 | bfd_get_section_by_name (input_bfd, ".fini"); |
| 1234 | symndx_to_section[RELOC_SECTION_LITA] = NULL; |
| 1235 | symndx_to_section[RELOC_SECTION_ABS] = NULL; |
| 1236 | |
| 1237 | ecoff_data (input_bfd)->symndx_to_section = symndx_to_section; |
| 1238 | } |
| 1239 | |
| 1240 | sym_hashes = ecoff_data (input_bfd)->sym_hashes; |
| 1241 | |
| 1242 | gp = ecoff_data (output_bfd)->gp; |
| 1243 | if (gp == 0) |
| 1244 | gp_undefined = true; |
| 1245 | else |
| 1246 | gp_undefined = false; |
| 1247 | |
| 1248 | got_lo = false; |
| 1249 | |
| 1250 | adjust = 0; |
| 1251 | |
| 1252 | if (ecoff_section_data (input_bfd, input_section) == NULL) |
| 1253 | offsets = NULL; |
| 1254 | else |
| 1255 | offsets = ecoff_section_data (input_bfd, input_section)->offsets; |
| 1256 | |
| 1257 | ext_rel = (struct external_reloc *) external_relocs; |
| 1258 | ext_rel_end = ext_rel + input_section->reloc_count; |
| 1259 | for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++) |
| 1260 | { |
| 1261 | struct internal_reloc int_rel; |
| 1262 | bfd_vma addend; |
| 1263 | reloc_howto_type *howto; |
| 1264 | struct ecoff_link_hash_entry *h = NULL; |
| 1265 | asection *s = NULL; |
| 1266 | bfd_vma relocation; |
| 1267 | bfd_reloc_status_type r; |
| 1268 | |
| 1269 | if (! got_lo) |
| 1270 | mips_ecoff_swap_reloc_in (input_bfd, (PTR) ext_rel, &int_rel); |
| 1271 | else |
| 1272 | { |
| 1273 | int_rel = lo_int_rel; |
| 1274 | got_lo = false; |
| 1275 | } |
| 1276 | |
| 1277 | BFD_ASSERT (int_rel.r_type |
| 1278 | < sizeof mips_howto_table / sizeof mips_howto_table[0]); |
| 1279 | |
| 1280 | /* The REFHI and RELHI relocs requires special handling. they |
| 1281 | must be followed by a REFLO or RELLO reloc, respectively, and |
| 1282 | the addend is formed from both relocs. */ |
| 1283 | if (int_rel.r_type == MIPS_R_REFHI |
| 1284 | || int_rel.r_type == MIPS_R_RELHI) |
| 1285 | { |
| 1286 | BFD_ASSERT ((ext_rel + 1) < ext_rel_end); |
| 1287 | mips_ecoff_swap_reloc_in (input_bfd, (PTR) (ext_rel + 1), |
| 1288 | &lo_int_rel); |
| 1289 | BFD_ASSERT ((lo_int_rel.r_type |
| 1290 | == (int_rel.r_type == MIPS_R_REFHI |
| 1291 | ? MIPS_R_REFLO |
| 1292 | : MIPS_R_RELLO)) |
| 1293 | && int_rel.r_extern == lo_int_rel.r_extern |
| 1294 | && int_rel.r_symndx == lo_int_rel.r_symndx); |
| 1295 | got_lo = true; |
| 1296 | } |
| 1297 | |
| 1298 | howto = &mips_howto_table[int_rel.r_type]; |
| 1299 | |
| 1300 | /* The SWITCH reloc must be handled specially. This reloc is |
| 1301 | marks the location of a difference between two portions of an |
| 1302 | object file. The symbol index does not reference a symbol, |
| 1303 | but is actually the offset from the reloc to the subtrahend |
| 1304 | of the difference. This reloc is correct in the object file, |
| 1305 | and needs no further adjustment, unless we are relaxing. If |
| 1306 | we are relaxing, we may have to add in an offset. Since no |
| 1307 | symbols are involved in this reloc, we handle it completely |
| 1308 | here. */ |
| 1309 | if (int_rel.r_type == MIPS_R_SWITCH) |
| 1310 | { |
| 1311 | if (offsets != NULL |
| 1312 | && offsets[i] != 0) |
| 1313 | { |
| 1314 | r = _bfd_relocate_contents (howto, input_bfd, |
| 1315 | (bfd_vma) offsets[i], |
| 1316 | (contents |
| 1317 | + adjust |
| 1318 | + int_rel.r_vaddr |
| 1319 | - input_section->vma)); |
| 1320 | BFD_ASSERT (r == bfd_reloc_ok); |
| 1321 | } |
| 1322 | |
| 1323 | continue; |
| 1324 | } |
| 1325 | |
| 1326 | if (int_rel.r_extern) |
| 1327 | { |
| 1328 | h = sym_hashes[int_rel.r_symndx]; |
| 1329 | /* If h is NULL, that means that there is a reloc against an |
| 1330 | external symbol which we thought was just a debugging |
| 1331 | symbol. This should not happen. */ |
| 1332 | if (h == (struct ecoff_link_hash_entry *) NULL) |
| 1333 | abort (); |
| 1334 | } |
| 1335 | else |
| 1336 | { |
| 1337 | if (int_rel.r_symndx < 0 || int_rel.r_symndx >= NUM_RELOC_SECTIONS) |
| 1338 | s = NULL; |
| 1339 | else |
| 1340 | s = symndx_to_section[int_rel.r_symndx]; |
| 1341 | |
| 1342 | if (s == (asection *) NULL) |
| 1343 | abort (); |
| 1344 | } |
| 1345 | |
| 1346 | /* The GPREL reloc uses an addend: the difference in the GP |
| 1347 | values. */ |
| 1348 | if (int_rel.r_type != MIPS_R_GPREL |
| 1349 | && int_rel.r_type != MIPS_R_LITERAL) |
| 1350 | addend = 0; |
| 1351 | else |
| 1352 | { |
| 1353 | if (gp_undefined) |
| 1354 | { |
| 1355 | if (! ((*info->callbacks->reloc_dangerous) |
| 1356 | (info, "GP relative relocation when GP not defined", |
| 1357 | input_bfd, input_section, |
| 1358 | int_rel.r_vaddr - input_section->vma))) |
| 1359 | return false; |
| 1360 | /* Only give the error once per link. */ |
| 1361 | ecoff_data (output_bfd)->gp = gp = 4; |
| 1362 | gp_undefined = false; |
| 1363 | } |
| 1364 | if (! int_rel.r_extern) |
| 1365 | { |
| 1366 | /* This is a relocation against a section. The current |
| 1367 | addend in the instruction is the difference between |
| 1368 | INPUT_SECTION->vma and the GP value of INPUT_BFD. We |
| 1369 | must change this to be the difference between the |
| 1370 | final definition (which will end up in RELOCATION) |
| 1371 | and the GP value of OUTPUT_BFD (which is in GP). */ |
| 1372 | addend = ecoff_data (input_bfd)->gp - gp; |
| 1373 | } |
| 1374 | else if (! info->relocateable |
| 1375 | || h->root.type == bfd_link_hash_defined) |
| 1376 | { |
| 1377 | /* This is a relocation against an undefined or common |
| 1378 | symbol. The current addend in the instruction is |
| 1379 | simply the desired offset into the symbol (normally |
| 1380 | zero). We are going to change this into a relocation |
| 1381 | against a defined symbol, so we want the instruction |
| 1382 | to hold the difference between the final definition |
| 1383 | of the symbol (which will end up in RELOCATION) and |
| 1384 | the GP value of OUTPUT_BFD (which is in GP). */ |
| 1385 | addend = - gp; |
| 1386 | } |
| 1387 | else |
| 1388 | { |
| 1389 | /* This is a relocation against an undefined or common |
| 1390 | symbol. The current addend in the instruction is |
| 1391 | simply the desired offset into the symbol (normally |
| 1392 | zero). We are generating relocateable output, and we |
| 1393 | aren't going to define this symbol, so we just leave |
| 1394 | the instruction alone. */ |
| 1395 | addend = 0; |
| 1396 | } |
| 1397 | } |
| 1398 | |
| 1399 | /* If we are relaxing, mips_relax_section may have set |
| 1400 | offsets[i] to some value. A value of 1 means we must expand |
| 1401 | a PC relative branch into a multi-instruction of sequence, |
| 1402 | and any other value is an addend. */ |
| 1403 | if (offsets != NULL |
| 1404 | && offsets[i] != 0) |
| 1405 | { |
| 1406 | BFD_ASSERT (! info->relocateable); |
| 1407 | BFD_ASSERT (int_rel.r_type == MIPS_R_PCREL16 |
| 1408 | || int_rel.r_type == MIPS_R_RELHI |
| 1409 | || int_rel.r_type == MIPS_R_RELLO); |
| 1410 | if (offsets[i] != 1) |
| 1411 | addend += offsets[i]; |
| 1412 | else |
| 1413 | { |
| 1414 | bfd_byte *here; |
| 1415 | |
| 1416 | BFD_ASSERT (int_rel.r_extern |
| 1417 | && int_rel.r_type == MIPS_R_PCREL16); |
| 1418 | |
| 1419 | /* Move the rest of the instructions up. */ |
| 1420 | here = (contents |
| 1421 | + adjust |
| 1422 | + int_rel.r_vaddr |
| 1423 | - input_section->vma); |
| 1424 | memmove (here + PCREL16_EXPANSION_ADJUSTMENT, here, |
| 1425 | (input_section->_raw_size |
| 1426 | - (int_rel.r_vaddr - input_section->vma))); |
| 1427 | |
| 1428 | /* Generate the new instructions. */ |
| 1429 | if (! mips_relax_pcrel16 (info, input_bfd, input_section, |
| 1430 | h, here, |
| 1431 | (input_section->output_section->vma |
| 1432 | + input_section->output_offset |
| 1433 | + (int_rel.r_vaddr |
| 1434 | - input_section->vma) |
| 1435 | + adjust))) |
| 1436 | return false; |
| 1437 | |
| 1438 | /* We must adjust everything else up a notch. */ |
| 1439 | adjust += PCREL16_EXPANSION_ADJUSTMENT; |
| 1440 | |
| 1441 | /* mips_relax_pcrel16 handles all the details of this |
| 1442 | relocation. */ |
| 1443 | continue; |
| 1444 | } |
| 1445 | } |
| 1446 | |
| 1447 | /* If we are relaxing, and this is a reloc against the .text |
| 1448 | segment, we may need to adjust it if some branches have been |
| 1449 | expanded. The reloc types which are likely to occur in the |
| 1450 | .text section are handled efficiently by mips_relax_section, |
| 1451 | and thus do not need to be handled here. */ |
| 1452 | if (ecoff_data (input_bfd)->debug_info.adjust != NULL |
| 1453 | && ! int_rel.r_extern |
| 1454 | && int_rel.r_symndx == RELOC_SECTION_TEXT |
| 1455 | && (strcmp (bfd_get_section_name (input_bfd, input_section), |
| 1456 | ".text") != 0 |
| 1457 | || (int_rel.r_type != MIPS_R_PCREL16 |
| 1458 | && int_rel.r_type != MIPS_R_SWITCH |
| 1459 | && int_rel.r_type != MIPS_R_RELHI |
| 1460 | && int_rel.r_type != MIPS_R_RELLO))) |
| 1461 | { |
| 1462 | bfd_vma adr; |
| 1463 | struct ecoff_value_adjust *a; |
| 1464 | |
| 1465 | /* We need to get the addend so that we know whether we need |
| 1466 | to adjust the address. */ |
| 1467 | BFD_ASSERT (int_rel.r_type == MIPS_R_REFWORD); |
| 1468 | |
| 1469 | adr = bfd_get_32 (input_bfd, |
| 1470 | (contents |
| 1471 | + adjust |
| 1472 | + int_rel.r_vaddr |
| 1473 | - input_section->vma)); |
| 1474 | |
| 1475 | for (a = ecoff_data (input_bfd)->debug_info.adjust; |
| 1476 | a != (struct ecoff_value_adjust *) NULL; |
| 1477 | a = a->next) |
| 1478 | { |
| 1479 | if (adr >= a->start && adr < a->end) |
| 1480 | addend += a->adjust; |
| 1481 | } |
| 1482 | } |
| 1483 | |
| 1484 | if (info->relocateable) |
| 1485 | { |
| 1486 | /* We are generating relocateable output, and must convert |
| 1487 | the existing reloc. */ |
| 1488 | if (int_rel.r_extern) |
| 1489 | { |
| 1490 | if (h->root.type == bfd_link_hash_defined) |
| 1491 | { |
| 1492 | const char *name; |
| 1493 | |
| 1494 | /* This symbol is defined in the output. Convert |
| 1495 | the reloc from being against the symbol to being |
| 1496 | against the section. */ |
| 1497 | |
| 1498 | /* Clear the r_extern bit. */ |
| 1499 | int_rel.r_extern = 0; |
| 1500 | |
| 1501 | /* Compute a new r_symndx value. */ |
| 1502 | s = h->root.u.def.section; |
| 1503 | name = bfd_get_section_name (output_bfd, |
| 1504 | s->output_section); |
| 1505 | |
| 1506 | int_rel.r_symndx = -1; |
| 1507 | switch (name[1]) |
| 1508 | { |
| 1509 | case 'b': |
| 1510 | if (strcmp (name, ".bss") == 0) |
| 1511 | int_rel.r_symndx = RELOC_SECTION_BSS; |
| 1512 | break; |
| 1513 | case 'd': |
| 1514 | if (strcmp (name, ".data") == 0) |
| 1515 | int_rel.r_symndx = RELOC_SECTION_DATA; |
| 1516 | break; |
| 1517 | case 'f': |
| 1518 | if (strcmp (name, ".fini") == 0) |
| 1519 | int_rel.r_symndx = RELOC_SECTION_FINI; |
| 1520 | break; |
| 1521 | case 'i': |
| 1522 | if (strcmp (name, ".init") == 0) |
| 1523 | int_rel.r_symndx = RELOC_SECTION_INIT; |
| 1524 | break; |
| 1525 | case 'l': |
| 1526 | if (strcmp (name, ".lit8") == 0) |
| 1527 | int_rel.r_symndx = RELOC_SECTION_LIT8; |
| 1528 | else if (strcmp (name, ".lit4") == 0) |
| 1529 | int_rel.r_symndx = RELOC_SECTION_LIT4; |
| 1530 | break; |
| 1531 | case 'r': |
| 1532 | if (strcmp (name, ".rdata") == 0) |
| 1533 | int_rel.r_symndx = RELOC_SECTION_RDATA; |
| 1534 | break; |
| 1535 | case 's': |
| 1536 | if (strcmp (name, ".sdata") == 0) |
| 1537 | int_rel.r_symndx = RELOC_SECTION_SDATA; |
| 1538 | else if (strcmp (name, ".sbss") == 0) |
| 1539 | int_rel.r_symndx = RELOC_SECTION_SBSS; |
| 1540 | break; |
| 1541 | case 't': |
| 1542 | if (strcmp (name, ".text") == 0) |
| 1543 | int_rel.r_symndx = RELOC_SECTION_TEXT; |
| 1544 | break; |
| 1545 | } |
| 1546 | |
| 1547 | if (int_rel.r_symndx == -1) |
| 1548 | abort (); |
| 1549 | |
| 1550 | /* Add the section VMA and the symbol value. */ |
| 1551 | relocation = (h->root.u.def.value |
| 1552 | + s->output_section->vma |
| 1553 | + s->output_offset); |
| 1554 | |
| 1555 | /* For a PC relative relocation, the object file |
| 1556 | currently holds just the addend. We must adjust |
| 1557 | by the address to get the right value. */ |
| 1558 | if (howto->pc_relative) |
| 1559 | { |
| 1560 | relocation -= int_rel.r_vaddr - input_section->vma; |
| 1561 | |
| 1562 | /* If we are converting a RELHI or RELLO reloc |
| 1563 | from being against an external symbol to |
| 1564 | being against a section, we must put a |
| 1565 | special value into the r_offset field. This |
| 1566 | value is the old addend. The r_offset for |
| 1567 | both the RELOHI and RELLO relocs are the |
| 1568 | same, and we set both when we see RELHI. */ |
| 1569 | if (int_rel.r_type == MIPS_R_RELHI) |
| 1570 | { |
| 1571 | long addhi, addlo; |
| 1572 | |
| 1573 | addhi = bfd_get_32 (input_bfd, |
| 1574 | (contents |
| 1575 | + adjust |
| 1576 | + int_rel.r_vaddr |
| 1577 | - input_section->vma)); |
| 1578 | addhi &= 0xffff; |
| 1579 | if (addhi & 0x8000) |
| 1580 | addhi -= 0x10000; |
| 1581 | addhi <<= 16; |
| 1582 | |
| 1583 | addlo = bfd_get_32 (input_bfd, |
| 1584 | (contents |
| 1585 | + adjust |
| 1586 | + lo_int_rel.r_vaddr |
| 1587 | - input_section->vma)); |
| 1588 | addlo &= 0xffff; |
| 1589 | if (addlo & 0x8000) |
| 1590 | addlo -= 0x10000; |
| 1591 | |
| 1592 | int_rel.r_offset = addhi + addlo; |
| 1593 | lo_int_rel.r_offset = int_rel.r_offset; |
| 1594 | } |
| 1595 | } |
| 1596 | |
| 1597 | h = NULL; |
| 1598 | } |
| 1599 | else |
| 1600 | { |
| 1601 | /* Change the symndx value to the right one for the |
| 1602 | output BFD. */ |
| 1603 | int_rel.r_symndx = h->indx; |
| 1604 | if (int_rel.r_symndx == -1) |
| 1605 | { |
| 1606 | /* This symbol is not being written out. */ |
| 1607 | if (! ((*info->callbacks->unattached_reloc) |
| 1608 | (info, h->root.root.string, input_bfd, |
| 1609 | input_section, |
| 1610 | int_rel.r_vaddr - input_section->vma))) |
| 1611 | return false; |
| 1612 | int_rel.r_symndx = 0; |
| 1613 | } |
| 1614 | relocation = 0; |
| 1615 | } |
| 1616 | } |
| 1617 | else |
| 1618 | { |
| 1619 | /* This is a relocation against a section. Adjust the |
| 1620 | value by the amount the section moved. */ |
| 1621 | relocation = (s->output_section->vma |
| 1622 | + s->output_offset |
| 1623 | - s->vma); |
| 1624 | } |
| 1625 | |
| 1626 | relocation += addend; |
| 1627 | addend = 0; |
| 1628 | |
| 1629 | /* Adjust a PC relative relocation by removing the reference |
| 1630 | to the original address in the section and including the |
| 1631 | reference to the new address. However, external RELHI |
| 1632 | and RELLO relocs are PC relative, but don't include any |
| 1633 | reference to the address. The addend is merely an |
| 1634 | addend. */ |
| 1635 | if (howto->pc_relative |
| 1636 | && (! int_rel.r_extern |
| 1637 | || (int_rel.r_type != MIPS_R_RELHI |
| 1638 | && int_rel.r_type != MIPS_R_RELLO))) |
| 1639 | relocation -= (input_section->output_section->vma |
| 1640 | + input_section->output_offset |
| 1641 | - input_section->vma); |
| 1642 | |
| 1643 | /* Adjust the contents. */ |
| 1644 | if (relocation == 0) |
| 1645 | r = bfd_reloc_ok; |
| 1646 | else |
| 1647 | { |
| 1648 | if (int_rel.r_type != MIPS_R_REFHI |
| 1649 | && int_rel.r_type != MIPS_R_RELHI) |
| 1650 | r = _bfd_relocate_contents (howto, input_bfd, relocation, |
| 1651 | (contents |
| 1652 | + adjust |
| 1653 | + int_rel.r_vaddr |
| 1654 | - input_section->vma)); |
| 1655 | else |
| 1656 | { |
| 1657 | mips_relocate_hi (&int_rel, &lo_int_rel, |
| 1658 | input_bfd, input_section, contents, |
| 1659 | adjust, relocation, |
| 1660 | int_rel.r_type == MIPS_R_RELHI); |
| 1661 | r = bfd_reloc_ok; |
| 1662 | } |
| 1663 | } |
| 1664 | |
| 1665 | /* Adjust the reloc address. */ |
| 1666 | int_rel.r_vaddr += (input_section->output_section->vma |
| 1667 | + input_section->output_offset |
| 1668 | - input_section->vma); |
| 1669 | |
| 1670 | /* Save the changed reloc information. */ |
| 1671 | mips_ecoff_swap_reloc_out (input_bfd, &int_rel, (PTR) ext_rel); |
| 1672 | } |
| 1673 | else |
| 1674 | { |
| 1675 | /* We are producing a final executable. */ |
| 1676 | if (int_rel.r_extern) |
| 1677 | { |
| 1678 | /* This is a reloc against a symbol. */ |
| 1679 | if (h->root.type == bfd_link_hash_defined) |
| 1680 | { |
| 1681 | asection *hsec; |
| 1682 | |
| 1683 | hsec = h->root.u.def.section; |
| 1684 | relocation = (h->root.u.def.value |
| 1685 | + hsec->output_section->vma |
| 1686 | + hsec->output_offset); |
| 1687 | } |
| 1688 | else |
| 1689 | { |
| 1690 | if (! ((*info->callbacks->undefined_symbol) |
| 1691 | (info, h->root.root.string, input_bfd, |
| 1692 | input_section, |
| 1693 | int_rel.r_vaddr - input_section->vma))) |
| 1694 | return false; |
| 1695 | relocation = 0; |
| 1696 | } |
| 1697 | } |
| 1698 | else |
| 1699 | { |
| 1700 | /* This is a reloc against a section. */ |
| 1701 | relocation = (s->output_section->vma |
| 1702 | + s->output_offset |
| 1703 | - s->vma); |
| 1704 | |
| 1705 | /* A PC relative reloc is already correct in the object |
| 1706 | file. Make it look like a pcrel_offset relocation by |
| 1707 | adding in the start address. */ |
| 1708 | if (howto->pc_relative) |
| 1709 | { |
| 1710 | if (int_rel.r_type != MIPS_R_RELHI) |
| 1711 | relocation += int_rel.r_vaddr + adjust; |
| 1712 | else |
| 1713 | relocation += lo_int_rel.r_vaddr + adjust; |
| 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | if (int_rel.r_type != MIPS_R_REFHI |
| 1718 | && int_rel.r_type != MIPS_R_RELHI) |
| 1719 | r = _bfd_final_link_relocate (howto, |
| 1720 | input_bfd, |
| 1721 | input_section, |
| 1722 | contents, |
| 1723 | (int_rel.r_vaddr |
| 1724 | - input_section->vma |
| 1725 | + adjust), |
| 1726 | relocation, |
| 1727 | addend); |
| 1728 | else |
| 1729 | { |
| 1730 | mips_relocate_hi (&int_rel, &lo_int_rel, input_bfd, |
| 1731 | input_section, contents, adjust, |
| 1732 | relocation, |
| 1733 | int_rel.r_type == MIPS_R_RELHI); |
| 1734 | r = bfd_reloc_ok; |
| 1735 | } |
| 1736 | } |
| 1737 | |
| 1738 | /* MIPS_R_JMPADDR requires peculiar overflow detection. The |
| 1739 | instruction provides a 28 bit address (the two lower bits are |
| 1740 | implicit zeroes) which is combined with the upper four bits |
| 1741 | of the instruction address. */ |
| 1742 | if (r == bfd_reloc_ok |
| 1743 | && int_rel.r_type == MIPS_R_JMPADDR |
| 1744 | && (((relocation |
| 1745 | + addend |
| 1746 | + (int_rel.r_extern ? 0 : s->vma)) |
| 1747 | & 0xf0000000) |
| 1748 | != ((input_section->output_section->vma |
| 1749 | + input_section->output_offset |
| 1750 | + (int_rel.r_vaddr - input_section->vma) |
| 1751 | + adjust) |
| 1752 | & 0xf0000000))) |
| 1753 | r = bfd_reloc_overflow; |
| 1754 | |
| 1755 | if (r != bfd_reloc_ok) |
| 1756 | { |
| 1757 | switch (r) |
| 1758 | { |
| 1759 | default: |
| 1760 | case bfd_reloc_outofrange: |
| 1761 | abort (); |
| 1762 | case bfd_reloc_overflow: |
| 1763 | { |
| 1764 | const char *name; |
| 1765 | |
| 1766 | if (int_rel.r_extern) |
| 1767 | name = h->root.root.string; |
| 1768 | else |
| 1769 | name = bfd_section_name (input_bfd, s); |
| 1770 | if (! ((*info->callbacks->reloc_overflow) |
| 1771 | (info, name, howto->name, (bfd_vma) 0, |
| 1772 | input_bfd, input_section, |
| 1773 | int_rel.r_vaddr - input_section->vma))) |
| 1774 | return false; |
| 1775 | } |
| 1776 | break; |
| 1777 | } |
| 1778 | } |
| 1779 | } |
| 1780 | |
| 1781 | return true; |
| 1782 | } |
| 1783 | \f |
| 1784 | /* Relax a section when linking a MIPS ECOFF file. This is used for |
| 1785 | embedded PIC code, which always uses PC relative branches which |
| 1786 | only have an 18 bit range on MIPS. If a branch is not in range, we |
| 1787 | generate a long instruction sequence to compensate. Each time we |
| 1788 | find a branch to expand, we have to check all the others again to |
| 1789 | make sure they are still in range. This is slow, but it only has |
| 1790 | to be done when -relax is passed to the linker. |
| 1791 | |
| 1792 | This routine figures out which branches need to expand; the actual |
| 1793 | expansion is done in mips_relocate_section when the section |
| 1794 | contents are relocated. The information is stored in the offsets |
| 1795 | field of the ecoff_section_tdata structure. An offset of 1 means |
| 1796 | that the branch must be expanded into a multi-instruction PC |
| 1797 | relative branch (such an offset will only occur for a PC relative |
| 1798 | branch to an external symbol). Any other offset must be a multiple |
| 1799 | of four, and is the amount to change the branch by (such an offset |
| 1800 | will only occur for a PC relative branch within the same section). |
| 1801 | |
| 1802 | We do not modify the section relocs or contents themselves so that |
| 1803 | if memory usage becomes an issue we can discard them and read them |
| 1804 | again. The only information we must save in memory between this |
| 1805 | routine and the mips_relocate_section routine is the table of |
| 1806 | offsets. */ |
| 1807 | |
| 1808 | static boolean |
| 1809 | mips_relax_section (abfd, sec, info, again) |
| 1810 | bfd *abfd; |
| 1811 | asection *sec; |
| 1812 | struct bfd_link_info *info; |
| 1813 | boolean *again; |
| 1814 | { |
| 1815 | struct ecoff_section_tdata *section_tdata; |
| 1816 | bfd_byte *contents = NULL; |
| 1817 | long *offsets; |
| 1818 | struct external_reloc *ext_rel; |
| 1819 | struct external_reloc *ext_rel_end; |
| 1820 | unsigned int i; |
| 1821 | |
| 1822 | /* Assume we are not going to need another pass. */ |
| 1823 | *again = false; |
| 1824 | |
| 1825 | /* If we are not generating an ECOFF file, this is much too |
| 1826 | confusing to deal with. */ |
| 1827 | if (info->hash->creator->flavour != bfd_get_flavour (abfd)) |
| 1828 | return true; |
| 1829 | |
| 1830 | /* If there are no relocs, there is nothing to do. */ |
| 1831 | if (sec->reloc_count == 0) |
| 1832 | return true; |
| 1833 | |
| 1834 | /* We are only interested in PC relative relocs, and why would there |
| 1835 | ever be one from anything but the .text section? */ |
| 1836 | if (strcmp (bfd_get_section_name (abfd, sec), ".text") != 0) |
| 1837 | return true; |
| 1838 | |
| 1839 | /* Read in the relocs, if we haven't already got them. */ |
| 1840 | section_tdata = ecoff_section_data (abfd, sec); |
| 1841 | if (section_tdata == (struct ecoff_section_tdata *) NULL) |
| 1842 | { |
| 1843 | bfd_size_type external_reloc_size; |
| 1844 | bfd_size_type external_relocs_size; |
| 1845 | |
| 1846 | sec->used_by_bfd = |
| 1847 | (PTR) bfd_alloc_by_size_t (abfd, sizeof (struct ecoff_section_tdata)); |
| 1848 | if (sec->used_by_bfd == NULL) |
| 1849 | { |
| 1850 | bfd_set_error (bfd_error_no_memory); |
| 1851 | goto error_return; |
| 1852 | } |
| 1853 | |
| 1854 | section_tdata = ecoff_section_data (abfd, sec); |
| 1855 | section_tdata->contents = NULL; |
| 1856 | section_tdata->offsets = NULL; |
| 1857 | |
| 1858 | external_reloc_size = ecoff_backend (abfd)->external_reloc_size; |
| 1859 | external_relocs_size = external_reloc_size * sec->reloc_count; |
| 1860 | |
| 1861 | section_tdata->external_relocs = |
| 1862 | (PTR) bfd_alloc (abfd, external_relocs_size); |
| 1863 | if (section_tdata->external_relocs == NULL && external_relocs_size != 0) |
| 1864 | { |
| 1865 | bfd_set_error (bfd_error_no_memory); |
| 1866 | goto error_return; |
| 1867 | } |
| 1868 | |
| 1869 | if (bfd_seek (abfd, sec->rel_filepos, SEEK_SET) != 0 |
| 1870 | || (bfd_read (section_tdata->external_relocs, 1, |
| 1871 | external_relocs_size, abfd) |
| 1872 | != external_relocs_size)) |
| 1873 | goto error_return; |
| 1874 | |
| 1875 | /* We must initialize _cooked_size only the first time we are |
| 1876 | called. */ |
| 1877 | sec->_cooked_size = sec->_raw_size; |
| 1878 | } |
| 1879 | |
| 1880 | contents = section_tdata->contents; |
| 1881 | offsets = section_tdata->offsets; |
| 1882 | |
| 1883 | /* Look for any external PC relative relocs. Internal PC relative |
| 1884 | relocs are already correct in the object file, so they certainly |
| 1885 | can not overflow. */ |
| 1886 | ext_rel = (struct external_reloc *) section_tdata->external_relocs; |
| 1887 | ext_rel_end = ext_rel + sec->reloc_count; |
| 1888 | for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++) |
| 1889 | { |
| 1890 | struct internal_reloc int_rel; |
| 1891 | struct ecoff_link_hash_entry *h; |
| 1892 | asection *hsec; |
| 1893 | bfd_signed_vma relocation; |
| 1894 | struct external_reloc *adj_ext_rel; |
| 1895 | unsigned int adj_i; |
| 1896 | unsigned long ext_count; |
| 1897 | struct ecoff_link_hash_entry **adj_h_ptr; |
| 1898 | struct ecoff_link_hash_entry **adj_h_ptr_end; |
| 1899 | struct ecoff_value_adjust *adjust; |
| 1900 | |
| 1901 | /* If we have already expanded this reloc, we certainly don't |
| 1902 | need to do it again. */ |
| 1903 | if (offsets != (long *) NULL && offsets[i] == 1) |
| 1904 | continue; |
| 1905 | |
| 1906 | /* Quickly check that this reloc is external PCREL16. */ |
| 1907 | if (abfd->xvec->header_byteorder_big_p) |
| 1908 | { |
| 1909 | if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) == 0 |
| 1910 | || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG) |
| 1911 | >> RELOC_BITS3_TYPE_SH_BIG) |
| 1912 | != MIPS_R_PCREL16)) |
| 1913 | continue; |
| 1914 | } |
| 1915 | else |
| 1916 | { |
| 1917 | if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) == 0 |
| 1918 | || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE) |
| 1919 | >> RELOC_BITS3_TYPE_SH_LITTLE) |
| 1920 | != MIPS_R_PCREL16)) |
| 1921 | continue; |
| 1922 | } |
| 1923 | |
| 1924 | mips_ecoff_swap_reloc_in (abfd, (PTR) ext_rel, &int_rel); |
| 1925 | |
| 1926 | h = ecoff_data (abfd)->sym_hashes[int_rel.r_symndx]; |
| 1927 | if (h == (struct ecoff_link_hash_entry *) NULL) |
| 1928 | abort (); |
| 1929 | |
| 1930 | if (h->root.type != bfd_link_hash_defined) |
| 1931 | { |
| 1932 | /* Just ignore undefined symbols. These will presumably |
| 1933 | generate an error later in the link. */ |
| 1934 | continue; |
| 1935 | } |
| 1936 | |
| 1937 | /* Get the value of the symbol. */ |
| 1938 | hsec = h->root.u.def.section; |
| 1939 | relocation = (h->root.u.def.value |
| 1940 | + hsec->output_section->vma |
| 1941 | + hsec->output_offset); |
| 1942 | |
| 1943 | /* Subtract out the current address. */ |
| 1944 | relocation -= (sec->output_section->vma |
| 1945 | + sec->output_offset |
| 1946 | + (int_rel.r_vaddr - sec->vma)); |
| 1947 | |
| 1948 | /* The addend is stored in the object file. In the normal case |
| 1949 | of ``bal symbol'', the addend will be -4. It will only be |
| 1950 | different in the case of ``bal symbol+constant''. To avoid |
| 1951 | always reading in the section contents, we don't check the |
| 1952 | addend in the object file (we could easily check the contents |
| 1953 | if we happen to have already read them in, but I fear that |
| 1954 | this could be confusing). This means we will screw up if |
| 1955 | there is a branch to a symbol that is in range, but added to |
| 1956 | a constant which puts it out of range; in such a case the |
| 1957 | link will fail with a reloc overflow error. Since the |
| 1958 | compiler will never generate such code, it should be easy |
| 1959 | enough to work around it by changing the assembly code in the |
| 1960 | source file. */ |
| 1961 | relocation -= 4; |
| 1962 | |
| 1963 | /* Now RELOCATION is the number we want to put in the object |
| 1964 | file. See whether it fits. */ |
| 1965 | if (relocation >= -0x20000 && relocation < 0x20000) |
| 1966 | continue; |
| 1967 | |
| 1968 | /* Now that we know this reloc needs work, which will rarely |
| 1969 | happen, go ahead and grab the section contents. */ |
| 1970 | if (contents == (bfd_byte *) NULL) |
| 1971 | { |
| 1972 | if (info->keep_memory) |
| 1973 | contents = (bfd_byte *) bfd_alloc (abfd, sec->_raw_size); |
| 1974 | else |
| 1975 | contents = (bfd_byte *) malloc (sec->_raw_size); |
| 1976 | if (contents == (bfd_byte *) NULL) |
| 1977 | { |
| 1978 | bfd_set_error (bfd_error_no_memory); |
| 1979 | goto error_return; |
| 1980 | } |
| 1981 | if (! bfd_get_section_contents (abfd, sec, (PTR) contents, |
| 1982 | (file_ptr) 0, sec->_raw_size)) |
| 1983 | goto error_return; |
| 1984 | if (info->keep_memory) |
| 1985 | section_tdata->contents = contents; |
| 1986 | } |
| 1987 | |
| 1988 | /* We only support changing the bal instruction. It would be |
| 1989 | possible to handle other PC relative branches, but some of |
| 1990 | them (the conditional branches) would require a different |
| 1991 | length instruction sequence which would complicate both this |
| 1992 | routine and mips_relax_pcrel16. It could be written if |
| 1993 | somebody felt it were important. Ignoring this reloc will |
| 1994 | presumably cause a reloc overflow error later on. */ |
| 1995 | if (bfd_get_32 (abfd, contents + int_rel.r_vaddr - sec->vma) |
| 1996 | != 0x0411ffff) /* bgezal $0,. == bal . */ |
| 1997 | continue; |
| 1998 | |
| 1999 | /* Bother. We need to expand this reloc, and we will need to |
| 2000 | make another relaxation pass since this change may put other |
| 2001 | relocs out of range. We need to examine the local branches |
| 2002 | and we need to allocate memory to hold the offsets we must |
| 2003 | add to them. We also need to adjust the values of all |
| 2004 | symbols in the object file following this location. */ |
| 2005 | |
| 2006 | sec->_cooked_size += PCREL16_EXPANSION_ADJUSTMENT; |
| 2007 | *again = true; |
| 2008 | |
| 2009 | if (offsets == (long *) NULL) |
| 2010 | { |
| 2011 | size_t size; |
| 2012 | |
| 2013 | size = sec->reloc_count * sizeof (long); |
| 2014 | offsets = (long *) bfd_alloc_by_size_t (abfd, size); |
| 2015 | if (offsets == (long *) NULL) |
| 2016 | { |
| 2017 | bfd_set_error (bfd_error_no_memory); |
| 2018 | goto error_return; |
| 2019 | } |
| 2020 | memset (offsets, 0, size); |
| 2021 | section_tdata->offsets = offsets; |
| 2022 | } |
| 2023 | |
| 2024 | offsets[i] = 1; |
| 2025 | |
| 2026 | /* Now look for all PC relative references that cross this reloc |
| 2027 | and adjust their offsets. */ |
| 2028 | adj_ext_rel = (struct external_reloc *) section_tdata->external_relocs; |
| 2029 | for (adj_i = 0; adj_ext_rel < ext_rel_end; adj_ext_rel++, adj_i++) |
| 2030 | { |
| 2031 | struct internal_reloc adj_int_rel; |
| 2032 | bfd_vma start, stop; |
| 2033 | int change; |
| 2034 | |
| 2035 | mips_ecoff_swap_reloc_in (abfd, (PTR) adj_ext_rel, &adj_int_rel); |
| 2036 | |
| 2037 | if (adj_int_rel.r_type == MIPS_R_PCREL16) |
| 2038 | { |
| 2039 | unsigned long insn; |
| 2040 | |
| 2041 | /* We only care about local references. External ones |
| 2042 | will be relocated correctly anyhow. */ |
| 2043 | if (adj_int_rel.r_extern) |
| 2044 | continue; |
| 2045 | |
| 2046 | /* We are only interested in a PC relative reloc within |
| 2047 | this section. FIXME: Cross section PC relative |
| 2048 | relocs may not be handled correctly; does anybody |
| 2049 | care? */ |
| 2050 | if (adj_int_rel.r_symndx != RELOC_SECTION_TEXT) |
| 2051 | continue; |
| 2052 | |
| 2053 | start = adj_int_rel.r_vaddr; |
| 2054 | |
| 2055 | insn = bfd_get_32 (abfd, |
| 2056 | contents + adj_int_rel.r_vaddr - sec->vma); |
| 2057 | |
| 2058 | stop = (insn & 0xffff) << 2; |
| 2059 | if ((stop & 0x20000) != 0) |
| 2060 | stop -= 0x40000; |
| 2061 | stop += adj_int_rel.r_vaddr + 4; |
| 2062 | } |
| 2063 | else if (adj_int_rel.r_type == MIPS_R_RELHI) |
| 2064 | { |
| 2065 | struct internal_reloc rello; |
| 2066 | long addhi, addlo; |
| 2067 | |
| 2068 | /* The next reloc must be MIPS_R_RELLO, and we handle |
| 2069 | them together. */ |
| 2070 | BFD_ASSERT (adj_ext_rel + 1 < ext_rel_end); |
| 2071 | |
| 2072 | mips_ecoff_swap_reloc_in (abfd, (PTR) (adj_ext_rel + 1), &rello); |
| 2073 | |
| 2074 | BFD_ASSERT (rello.r_type == MIPS_R_RELLO); |
| 2075 | |
| 2076 | addhi = bfd_get_32 (abfd, |
| 2077 | contents + adj_int_rel.r_vaddr - sec->vma); |
| 2078 | addhi &= 0xffff; |
| 2079 | if (addhi & 0x8000) |
| 2080 | addhi -= 0x10000; |
| 2081 | addhi <<= 16; |
| 2082 | |
| 2083 | addlo = bfd_get_32 (abfd, contents + rello.r_vaddr - sec->vma); |
| 2084 | addlo &= 0xffff; |
| 2085 | if (addlo & 0x8000) |
| 2086 | addlo -= 0x10000; |
| 2087 | |
| 2088 | if (adj_int_rel.r_extern) |
| 2089 | { |
| 2090 | /* The value we want here is |
| 2091 | sym - RELLOaddr + addend |
| 2092 | which we can express as |
| 2093 | sym - (RELLOaddr - addend) |
| 2094 | Therefore if we are expanding the area between |
| 2095 | RELLOaddr and RELLOaddr - addend we must adjust |
| 2096 | the addend. This is admittedly ambiguous, since |
| 2097 | we might mean (sym + addend) - RELLOaddr, but in |
| 2098 | practice we don't, and there is no way to handle |
| 2099 | that case correctly since at this point we have |
| 2100 | no idea whether any reloc is being expanded |
| 2101 | between sym and sym + addend. */ |
| 2102 | start = rello.r_vaddr - (addhi + addlo); |
| 2103 | stop = rello.r_vaddr; |
| 2104 | } |
| 2105 | else |
| 2106 | { |
| 2107 | /* An internal RELHI/RELLO pair represents the |
| 2108 | difference between two addresses, $LC0 - foo. |
| 2109 | The symndx value is actually the difference |
| 2110 | between the reloc address and $LC0. This lets us |
| 2111 | compute $LC0, and, by considering the addend, |
| 2112 | foo. If the reloc we are expanding falls between |
| 2113 | those two relocs, we must adjust the addend. At |
| 2114 | this point, the symndx value is actually in the |
| 2115 | r_offset field, where it was put by |
| 2116 | mips_ecoff_swap_reloc_in. */ |
| 2117 | start = rello.r_vaddr - adj_int_rel.r_offset; |
| 2118 | stop = start + addhi + addlo; |
| 2119 | } |
| 2120 | } |
| 2121 | else if (adj_int_rel.r_type == MIPS_R_SWITCH) |
| 2122 | { |
| 2123 | /* A MIPS_R_SWITCH reloc represents a word of the form |
| 2124 | .word $L3-$LS12 |
| 2125 | The value in the object file is correct, assuming the |
| 2126 | original value of $L3. The symndx value is actually |
| 2127 | the difference between the reloc address and $LS12. |
| 2128 | This lets us compute the original value of $LS12 as |
| 2129 | vaddr - symndx |
| 2130 | and the original value of $L3 as |
| 2131 | vaddr - symndx + addend |
| 2132 | where addend is the value from the object file. At |
| 2133 | this point, the symndx value is actually found in the |
| 2134 | r_offset field, since it was moved by |
| 2135 | mips_ecoff_swap_reloc_in. */ |
| 2136 | start = adj_int_rel.r_vaddr - adj_int_rel.r_offset; |
| 2137 | stop = start + bfd_get_32 (abfd, |
| 2138 | (contents |
| 2139 | + adj_int_rel.r_vaddr |
| 2140 | - sec->vma)); |
| 2141 | } |
| 2142 | else |
| 2143 | continue; |
| 2144 | |
| 2145 | /* If the range expressed by this reloc, which is the |
| 2146 | distance between START and STOP crosses the reloc we are |
| 2147 | expanding, we must adjust the offset. The sign of the |
| 2148 | adjustment depends upon the direction in which the range |
| 2149 | crosses the reloc being expanded. */ |
| 2150 | if (start <= int_rel.r_vaddr && stop > int_rel.r_vaddr) |
| 2151 | change = PCREL16_EXPANSION_ADJUSTMENT; |
| 2152 | else if (start > int_rel.r_vaddr && stop <= int_rel.r_vaddr) |
| 2153 | change = - PCREL16_EXPANSION_ADJUSTMENT; |
| 2154 | else |
| 2155 | change = 0; |
| 2156 | |
| 2157 | offsets[adj_i] += change; |
| 2158 | |
| 2159 | if (adj_int_rel.r_type == MIPS_R_RELHI) |
| 2160 | { |
| 2161 | adj_ext_rel++; |
| 2162 | adj_i++; |
| 2163 | offsets[adj_i] += change; |
| 2164 | } |
| 2165 | } |
| 2166 | |
| 2167 | /* Find all symbols in this section defined by this object file |
| 2168 | and adjust their values. Note that we decide whether to |
| 2169 | adjust the value based on the value stored in the ECOFF EXTR |
| 2170 | structure, because the value stored in the hash table may |
| 2171 | have been changed by an earlier expanded reloc and thus may |
| 2172 | no longer correctly indicate whether the symbol is before or |
| 2173 | after the expanded reloc. */ |
| 2174 | ext_count = ecoff_data (abfd)->debug_info.symbolic_header.iextMax; |
| 2175 | adj_h_ptr = ecoff_data (abfd)->sym_hashes; |
| 2176 | adj_h_ptr_end = adj_h_ptr + ext_count; |
| 2177 | for (; adj_h_ptr < adj_h_ptr_end; adj_h_ptr++) |
| 2178 | { |
| 2179 | struct ecoff_link_hash_entry *adj_h; |
| 2180 | |
| 2181 | adj_h = *adj_h_ptr; |
| 2182 | if (adj_h != (struct ecoff_link_hash_entry *) NULL |
| 2183 | && adj_h->root.type == bfd_link_hash_defined |
| 2184 | && adj_h->root.u.def.section == sec |
| 2185 | && adj_h->esym.asym.value > int_rel.r_vaddr) |
| 2186 | adj_h->root.u.def.value += PCREL16_EXPANSION_ADJUSTMENT; |
| 2187 | } |
| 2188 | |
| 2189 | /* Add an entry to the symbol value adjust list. This is used |
| 2190 | by bfd_ecoff_debug_accumulate to adjust the values of |
| 2191 | internal symbols and FDR's. */ |
| 2192 | adjust = ((struct ecoff_value_adjust *) |
| 2193 | bfd_alloc (abfd, sizeof (struct ecoff_value_adjust))); |
| 2194 | if (adjust == (struct ecoff_value_adjust *) NULL) |
| 2195 | { |
| 2196 | bfd_set_error (bfd_error_no_memory); |
| 2197 | goto error_return; |
| 2198 | } |
| 2199 | |
| 2200 | adjust->start = int_rel.r_vaddr; |
| 2201 | adjust->end = sec->vma + sec->_raw_size; |
| 2202 | adjust->adjust = PCREL16_EXPANSION_ADJUSTMENT; |
| 2203 | |
| 2204 | adjust->next = ecoff_data (abfd)->debug_info.adjust; |
| 2205 | ecoff_data (abfd)->debug_info.adjust = adjust; |
| 2206 | } |
| 2207 | |
| 2208 | if (contents != (bfd_byte *) NULL && ! info->keep_memory) |
| 2209 | free (contents); |
| 2210 | |
| 2211 | return true; |
| 2212 | |
| 2213 | error_return: |
| 2214 | if (contents != (bfd_byte *) NULL && ! info->keep_memory) |
| 2215 | free (contents); |
| 2216 | return false; |
| 2217 | } |
| 2218 | |
| 2219 | /* This routine is called from mips_relocate_section when a PC |
| 2220 | relative reloc must be expanded into the five instruction sequence. |
| 2221 | It handles all the details of the expansion, including resolving |
| 2222 | the reloc. */ |
| 2223 | |
| 2224 | static boolean |
| 2225 | mips_relax_pcrel16 (info, input_bfd, input_section, h, location, address) |
| 2226 | struct bfd_link_info *info; |
| 2227 | bfd *input_bfd; |
| 2228 | asection *input_section; |
| 2229 | struct ecoff_link_hash_entry *h; |
| 2230 | bfd_byte *location; |
| 2231 | bfd_vma address; |
| 2232 | { |
| 2233 | bfd_vma relocation; |
| 2234 | |
| 2235 | /* 0x0411ffff is bgezal $0,. == bal . */ |
| 2236 | BFD_ASSERT (bfd_get_32 (input_bfd, location) == 0x0411ffff); |
| 2237 | |
| 2238 | /* We need to compute the distance between the symbol and the |
| 2239 | current address plus eight. */ |
| 2240 | relocation = (h->root.u.def.value |
| 2241 | + h->root.u.def.section->output_section->vma |
| 2242 | + h->root.u.def.section->output_offset); |
| 2243 | relocation -= address + 8; |
| 2244 | |
| 2245 | /* If the lower half is negative, increment the upper 16 half. */ |
| 2246 | if ((relocation & 0x8000) != 0) |
| 2247 | relocation += 0x10000; |
| 2248 | |
| 2249 | bfd_put_32 (input_bfd, 0x04110001, location); /* bal .+8 */ |
| 2250 | bfd_put_32 (input_bfd, |
| 2251 | 0x3c010000 | ((relocation >> 16) & 0xffff), /* lui $at,XX */ |
| 2252 | location + 4); |
| 2253 | bfd_put_32 (input_bfd, |
| 2254 | 0x24210000 | (relocation & 0xffff), /* addiu $at,$at,XX */ |
| 2255 | location + 8); |
| 2256 | bfd_put_32 (input_bfd, 0x003f0821, location + 12); /* addu $at,$at,$ra */ |
| 2257 | bfd_put_32 (input_bfd, 0x0020f809, location + 16); /* jalr $at */ |
| 2258 | |
| 2259 | return true; |
| 2260 | } |
| 2261 | \f |
| 2262 | /* This is the ECOFF backend structure. The backend field of the |
| 2263 | target vector points to this. */ |
| 2264 | |
| 2265 | static const struct ecoff_backend_data mips_ecoff_backend_data = |
| 2266 | { |
| 2267 | /* COFF backend structure. */ |
| 2268 | { |
| 2269 | (void (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR))) bfd_void, /* aux_in */ |
| 2270 | (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_in */ |
| 2271 | (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_in */ |
| 2272 | (unsigned (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR)))bfd_void,/*aux_out*/ |
| 2273 | (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_out */ |
| 2274 | (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_out */ |
| 2275 | (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* reloc_out */ |
| 2276 | mips_ecoff_swap_filehdr_out, mips_ecoff_swap_aouthdr_out, |
| 2277 | mips_ecoff_swap_scnhdr_out, |
| 2278 | FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, 0, true, |
| 2279 | mips_ecoff_swap_filehdr_in, mips_ecoff_swap_aouthdr_in, |
| 2280 | mips_ecoff_swap_scnhdr_in, NULL, |
| 2281 | mips_ecoff_bad_format_hook, _bfd_ecoff_set_arch_mach_hook, |
| 2282 | _bfd_ecoff_mkobject_hook, _bfd_ecoff_styp_to_sec_flags, |
| 2283 | _bfd_ecoff_make_section_hook, _bfd_ecoff_set_alignment_hook, |
| 2284 | _bfd_ecoff_slurp_symbol_table, |
| 2285 | NULL, NULL, NULL, NULL, NULL, NULL |
| 2286 | }, |
| 2287 | /* Supported architecture. */ |
| 2288 | bfd_arch_mips, |
| 2289 | /* Initial portion of armap string. */ |
| 2290 | "__________", |
| 2291 | /* The page boundary used to align sections in a demand-paged |
| 2292 | executable file. E.g., 0x1000. */ |
| 2293 | 0x1000, |
| 2294 | /* True if the .rdata section is part of the text segment, as on the |
| 2295 | Alpha. False if .rdata is part of the data segment, as on the |
| 2296 | MIPS. */ |
| 2297 | false, |
| 2298 | /* Bitsize of constructor entries. */ |
| 2299 | 32, |
| 2300 | /* Reloc to use for constructor entries. */ |
| 2301 | &mips_howto_table[MIPS_R_REFWORD], |
| 2302 | { |
| 2303 | /* Symbol table magic number. */ |
| 2304 | magicSym, |
| 2305 | /* Alignment of debugging information. E.g., 4. */ |
| 2306 | 4, |
| 2307 | /* Sizes of external symbolic information. */ |
| 2308 | sizeof (struct hdr_ext), |
| 2309 | sizeof (struct dnr_ext), |
| 2310 | sizeof (struct pdr_ext), |
| 2311 | sizeof (struct sym_ext), |
| 2312 | sizeof (struct opt_ext), |
| 2313 | sizeof (struct fdr_ext), |
| 2314 | sizeof (struct rfd_ext), |
| 2315 | sizeof (struct ext_ext), |
| 2316 | /* Functions to swap in external symbolic data. */ |
| 2317 | ecoff_swap_hdr_in, |
| 2318 | ecoff_swap_dnr_in, |
| 2319 | ecoff_swap_pdr_in, |
| 2320 | ecoff_swap_sym_in, |
| 2321 | ecoff_swap_opt_in, |
| 2322 | ecoff_swap_fdr_in, |
| 2323 | ecoff_swap_rfd_in, |
| 2324 | ecoff_swap_ext_in, |
| 2325 | _bfd_ecoff_swap_tir_in, |
| 2326 | _bfd_ecoff_swap_rndx_in, |
| 2327 | /* Functions to swap out external symbolic data. */ |
| 2328 | ecoff_swap_hdr_out, |
| 2329 | ecoff_swap_dnr_out, |
| 2330 | ecoff_swap_pdr_out, |
| 2331 | ecoff_swap_sym_out, |
| 2332 | ecoff_swap_opt_out, |
| 2333 | ecoff_swap_fdr_out, |
| 2334 | ecoff_swap_rfd_out, |
| 2335 | ecoff_swap_ext_out, |
| 2336 | _bfd_ecoff_swap_tir_out, |
| 2337 | _bfd_ecoff_swap_rndx_out, |
| 2338 | /* Function to read in symbolic data. */ |
| 2339 | _bfd_ecoff_slurp_symbolic_info |
| 2340 | }, |
| 2341 | /* External reloc size. */ |
| 2342 | RELSZ, |
| 2343 | /* Reloc swapping functions. */ |
| 2344 | mips_ecoff_swap_reloc_in, |
| 2345 | mips_ecoff_swap_reloc_out, |
| 2346 | /* Backend reloc tweaking. */ |
| 2347 | mips_adjust_reloc_in, |
| 2348 | mips_adjust_reloc_out, |
| 2349 | /* Relocate section contents while linking. */ |
| 2350 | mips_relocate_section |
| 2351 | }; |
| 2352 | |
| 2353 | /* Looking up a reloc type is MIPS specific. */ |
| 2354 | #define _bfd_ecoff_bfd_reloc_type_lookup mips_bfd_reloc_type_lookup |
| 2355 | |
| 2356 | /* Getting relocated section contents is generic. */ |
| 2357 | #define _bfd_ecoff_bfd_get_relocated_section_contents \ |
| 2358 | bfd_generic_get_relocated_section_contents |
| 2359 | |
| 2360 | /* Relaxing sections is MIPS specific. */ |
| 2361 | #define _bfd_ecoff_bfd_relax_section mips_relax_section |
| 2362 | |
| 2363 | const bfd_target ecoff_little_vec = |
| 2364 | { |
| 2365 | "ecoff-littlemips", /* name */ |
| 2366 | bfd_target_ecoff_flavour, |
| 2367 | false, /* data byte order is little */ |
| 2368 | false, /* header byte order is little */ |
| 2369 | |
| 2370 | (HAS_RELOC | EXEC_P | /* object flags */ |
| 2371 | HAS_LINENO | HAS_DEBUG | |
| 2372 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), |
| 2373 | |
| 2374 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect |
| 2375 | flags */ |
| 2376 | 0, /* leading underscore */ |
| 2377 | ' ', /* ar_pad_char */ |
| 2378 | 15, /* ar_max_namelen */ |
| 2379 | 4, /* minimum alignment power */ |
| 2380 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 2381 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 2382 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ |
| 2383 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 2384 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 2385 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ |
| 2386 | |
| 2387 | {_bfd_dummy_target, coff_object_p, /* bfd_check_format */ |
| 2388 | _bfd_ecoff_archive_p, _bfd_dummy_target}, |
| 2389 | {bfd_false, _bfd_ecoff_mkobject, /* bfd_set_format */ |
| 2390 | _bfd_generic_mkarchive, bfd_false}, |
| 2391 | {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */ |
| 2392 | _bfd_write_archive_contents, bfd_false}, |
| 2393 | |
| 2394 | BFD_JUMP_TABLE_GENERIC (_bfd_ecoff), |
| 2395 | BFD_JUMP_TABLE_COPY (_bfd_ecoff), |
| 2396 | BFD_JUMP_TABLE_CORE (_bfd_nocore), |
| 2397 | BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff), |
| 2398 | BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff), |
| 2399 | BFD_JUMP_TABLE_RELOCS (_bfd_ecoff), |
| 2400 | BFD_JUMP_TABLE_WRITE (_bfd_ecoff), |
| 2401 | BFD_JUMP_TABLE_LINK (_bfd_ecoff), |
| 2402 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
| 2403 | |
| 2404 | (PTR) &mips_ecoff_backend_data |
| 2405 | }; |
| 2406 | |
| 2407 | const bfd_target ecoff_big_vec = |
| 2408 | { |
| 2409 | "ecoff-bigmips", /* name */ |
| 2410 | bfd_target_ecoff_flavour, |
| 2411 | true, /* data byte order is big */ |
| 2412 | true, /* header byte order is big */ |
| 2413 | |
| 2414 | (HAS_RELOC | EXEC_P | /* object flags */ |
| 2415 | HAS_LINENO | HAS_DEBUG | |
| 2416 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), |
| 2417 | |
| 2418 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect flags */ |
| 2419 | 0, /* leading underscore */ |
| 2420 | ' ', /* ar_pad_char */ |
| 2421 | 15, /* ar_max_namelen */ |
| 2422 | 4, /* minimum alignment power */ |
| 2423 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
| 2424 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
| 2425 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, |
| 2426 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
| 2427 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
| 2428 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, |
| 2429 | {_bfd_dummy_target, coff_object_p, /* bfd_check_format */ |
| 2430 | _bfd_ecoff_archive_p, _bfd_dummy_target}, |
| 2431 | {bfd_false, _bfd_ecoff_mkobject, /* bfd_set_format */ |
| 2432 | _bfd_generic_mkarchive, bfd_false}, |
| 2433 | {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */ |
| 2434 | _bfd_write_archive_contents, bfd_false}, |
| 2435 | |
| 2436 | BFD_JUMP_TABLE_GENERIC (_bfd_ecoff), |
| 2437 | BFD_JUMP_TABLE_COPY (_bfd_ecoff), |
| 2438 | BFD_JUMP_TABLE_CORE (_bfd_nocore), |
| 2439 | BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff), |
| 2440 | BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff), |
| 2441 | BFD_JUMP_TABLE_RELOCS (_bfd_ecoff), |
| 2442 | BFD_JUMP_TABLE_WRITE (_bfd_ecoff), |
| 2443 | BFD_JUMP_TABLE_LINK (_bfd_ecoff), |
| 2444 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
| 2445 | |
| 2446 | (PTR) &mips_ecoff_backend_data |
| 2447 | }; |