bfd/elf32-xgate.c

   1 /* Freescale XGATE-specific support for 32-bit ELF
   2    Copyright (C) 2010-2022 Free Software Foundation, Inc.
   3    Contributed by Sean Keys(skeys@ipdatasys.com)
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "bfdlink.h"
  25 #include "libbfd.h"
  26 #include "elf-bfd.h"
  27 #include "elf/xgate.h"
  28 #include "opcode/xgate.h"
  29 #include "libiberty.h"
  30
  31 /* Forward declarations.  */
  32 static bfd_reloc_status_type xgate_elf_ignore_reloc
  33   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  34 static bfd_reloc_status_type xgate_elf_special_reloc
  35   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  36
  37 /* Use REL instead of RELA to save space */
  38 #define USE_REL 1
  39
  40 static reloc_howto_type elf_xgate_howto_table[] =
  41 {
  42   /* This reloc does nothing.  */
  43   HOWTO (R_XGATE_NONE, /* type */
  44          0, /* rightshift */
  45          3, /* size (0 = byte, 1 = short, 2 = long) */
  46          0, /* bitsize */
  47          false, /* pc_relative */
  48          0, /* bitpos */
  49          complain_overflow_dont,/* complain_on_overflow */
  50          bfd_elf_generic_reloc, /* special_function */
  51          "R_XGATE_NONE", /* name */
  52          false, /* partial_inplace */
  53          0, /* src_mask */
  54          0, /* dst_mask */
  55          false), /* pcrel_offset */
  56
  57   /* A 8 bit absolute relocation.  */
  58   HOWTO (R_XGATE_8, /* type */
  59          0, /* rightshift */
  60          0, /* size (0 = byte, 1 = short, 2 = long) */
  61          8, /* bitsize */
  62          false, /* pc_relative */
  63          0, /* bitpos */
  64          complain_overflow_bitfield, /* complain_on_overflow */
  65          bfd_elf_generic_reloc, /* special_function */
  66          "R_XGATE_8", /* name */
  67          false, /* partial_inplace */
  68          0x00ff, /* src_mask */
  69          0x00ff, /* dst_mask */
  70          false), /* pcrel_offset */
  71
  72   /* A 8 bit PC-rel relocation.  */
  73   HOWTO (R_XGATE_PCREL_8, /* type */
  74          0, /* rightshift */
  75          0, /* size (0 = byte, 1 = short, 2 = long) */
  76          8, /* bitsize */
  77          true, /* pc_relative */
  78          0, /* bitpos */
  79          complain_overflow_bitfield, /* complain_on_overflow */
  80          bfd_elf_generic_reloc, /* special_function */
  81          "R_XGATE_PCREL_8", /* name */
  82          false, /* partial_inplace */
  83          0x00ff, /* src_mask */
  84          0x00ff, /* dst_mask */
  85          true), /* pcrel_offset */
  86
  87   /* A 16 bit absolute relocation.  */
  88   HOWTO (R_XGATE_16, /* type */
  89          0, /* rightshift */
  90          1, /* size (0 = byte, 1 = short, 2 = long) */
  91          16, /* bitsize */
  92          false, /* pc_relative */
  93          0, /* bitpos */
  94          complain_overflow_dont /*bitfield */, /* complain_on_overflow */
  95          bfd_elf_generic_reloc, /* special_function */
  96          "R_XGATE_16", /* name */
  97          false, /* partial_inplace */
  98          0xffff, /* src_mask */
  99          0xffff, /* dst_mask */
 100          false), /* pcrel_offset */
 101
 102   /* A 32 bit absolute relocation.  This one is never used for the
 103      code relocation.  It's used by gas for -gstabs generation.  */
 104   HOWTO (R_XGATE_32, /* type */
 105          0, /* rightshift */
 106          2, /* size (0 = byte, 1 = short, 2 = long) */
 107          32, /* bitsize */
 108          false, /* pc_relative */
 109          0, /* bitpos */
 110          complain_overflow_bitfield, /* complain_on_overflow */
 111          bfd_elf_generic_reloc, /* special_function */
 112          "R_XGATE_32", /* name */
 113          false, /* partial_inplace */
 114          0xffffffff, /* src_mask */
 115          0xffffffff, /* dst_mask */
 116          false), /* pcrel_offset */
 117
 118   /* A 16 bit PC-rel relocation.  */
 119   HOWTO (R_XGATE_PCREL_16, /* type */
 120          0, /* rightshift */
 121          1, /* size (0 = byte, 1 = short, 2 = long) */
 122          16, /* bitsize */
 123          true, /* pc_relative */
 124          0, /* bitpos */
 125          complain_overflow_dont, /* complain_on_overflow */
 126          bfd_elf_generic_reloc, /* special_function */
 127          "R_XGATE_PCREL_16", /* name */
 128          false, /* partial_inplace */
 129          0xffff, /* src_mask */
 130          0xffff, /* dst_mask */
 131          true), /* pcrel_offset */
 132
 133   /* GNU extension to record C++ vtable hierarchy.  */
 134   HOWTO (R_XGATE_GNU_VTINHERIT, /* type */
 135          0, /* rightshift */
 136          1, /* size (0 = byte, 1 = short, 2 = long) */
 137          0, /* bitsize */
 138          false, /* pc_relative */
 139          0, /* bitpos */
 140          complain_overflow_dont, /* complain_on_overflow */
 141          NULL, /* special_function */
 142          "R_XGATE_GNU_VTINHERIT", /* name */
 143          false, /* partial_inplace */
 144          0, /* src_mask */
 145          0, /* dst_mask */
 146          false), /* pcrel_offset */
 147
 148   /* GNU extension to record C++ vtable member usage.  */
 149   HOWTO (R_XGATE_GNU_VTENTRY, /* type */
 150          0, /* rightshift */
 151          1, /* size (0 = byte, 1 = short, 2 = long) */
 152          0, /* bitsize */
 153          false, /* pc_relative */
 154          0, /* bitpos */
 155          complain_overflow_dont, /* complain_on_overflow */
 156          _bfd_elf_rel_vtable_reloc_fn, /* special_function */
 157          "R_XGATE_GNU_VTENTRY", /* name */
 158          false, /* partial_inplace */
 159          0, /* src_mask */
 160          0, /* dst_mask */
 161          false), /* pcrel_offset */
 162
 163   /* A 24 bit relocation.  */
 164   HOWTO (R_XGATE_24, /* type */
 165          0, /* rightshift */
 166          1, /* size (0 = byte, 1 = short, 2 = long) */
 167          16, /* bitsize */
 168          false, /* pc_relative */
 169          0, /* bitpos */
 170          complain_overflow_dont, /* complain_on_overflow */
 171          bfd_elf_generic_reloc, /* special_function */
 172          "R_XGATE_IMM8_LO", /* name */
 173          false, /* partial_inplace */
 174          0x00ff, /* src_mask */
 175          0x00ff, /* dst_mask */
 176          false), /* pcrel_offset */
 177
 178   /* A 16-bit low relocation.  */
 179   HOWTO (R_XGATE_LO16, /* type */
 180          8, /* rightshift */
 181          1, /* size (0 = byte, 1 = short, 2 = long) */
 182          16, /* bitsize */
 183          false, /* pc_relative */
 184          0, /* bitpos */
 185          complain_overflow_dont, /* complain_on_overflow */
 186          bfd_elf_generic_reloc, /* special_function */
 187          "R_XGATE_IMM8_HI", /* name */
 188          false, /* partial_inplace */
 189          0x00ff, /* src_mask */
 190          0x00ff, /* dst_mask */
 191          false), /* pcrel_offset */
 192
 193   /* A page relocation.  */
 194   HOWTO (R_XGATE_GPAGE, /* type */
 195          0, /* rightshift */
 196          0, /* size (0 = byte, 1 = short, 2 = long) */
 197          8, /* bitsize */
 198          false, /* pc_relative */
 199          0, /* bitpos */
 200          complain_overflow_dont, /* complain_on_overflow */
 201          xgate_elf_special_reloc,/* special_function */
 202          "R_XGATE_GPAGE", /* name */
 203          false, /* partial_inplace */
 204          0x00ff, /* src_mask */
 205          0x00ff, /* dst_mask */
 206          false), /* pcrel_offset */
 207
 208   /* A 9 bit absolute relocation.   */
 209   HOWTO (R_XGATE_PCREL_9, /* type */
 210          0, /* rightshift */
 211          1, /* size (0 = byte, 1 = short, 2 = long) */
 212          9, /* bitsize */
 213          true, /* pc_relative */
 214          0, /* bitpos */
 215          complain_overflow_bitfield, /* complain_on_overflow */
 216          bfd_elf_generic_reloc, /* special_function */
 217          "R_XGATE_PCREL_9", /* name */
 218          false, /* partial_inplace */
 219          0xffff, /* src_mask */
 220          0xffff, /* dst_mask */
 221          true), /* pcrel_offset */
 222
 223   /* A 8 bit absolute relocation (upper address).  */
 224   HOWTO (R_XGATE_PCREL_10, /* type */
 225          8, /* rightshift */
 226          0, /* size (0 = byte, 1 = short, 2 = long) */
 227          10, /* bitsize */
 228          true, /* pc_relative */
 229          0, /* bitpos */
 230          complain_overflow_dont, /* complain_on_overflow */
 231          bfd_elf_generic_reloc, /* special_function */
 232          "R_XGATE_PCREL_10", /* name */
 233          false, /* partial_inplace */
 234          0x00ff, /* src_mask */
 235          0x00ff, /* dst_mask */
 236          true), /* pcrel_offset */
 237
 238   /* A 8 bit absolute relocation.  */
 239   HOWTO (R_XGATE_IMM8_LO, /* type */
 240          0, /* rightshift */
 241          1, /* size (0 = byte, 1 = short, 2 = long) */
 242          16, /* bitsize */
 243          false, /* pc_relative */
 244          0, /* bitpos */
 245          complain_overflow_dont, /* complain_on_overflow */
 246          bfd_elf_generic_reloc, /* special_function */
 247          "R_XGATE_IMM8_LO", /* name */
 248          false, /* partial_inplace */
 249          0xffff, /* src_mask */
 250          0xffff, /* dst_mask */
 251          false), /* pcrel_offset */
 252
 253   /* A 16 bit absolute relocation (upper address).  */
 254   HOWTO (R_XGATE_IMM8_HI, /* type */
 255          8, /* rightshift */
 256          1, /* size (0 = byte, 1 = short, 2 = long) */
 257          16, /* bitsize */
 258          false, /* pc_relative */
 259          0, /* bitpos */
 260          complain_overflow_dont, /* complain_on_overflow */
 261          bfd_elf_generic_reloc, /* special_function */
 262          "R_XGATE_IMM8_HI", /* name */
 263          false, /* partial_inplace */
 264          0x00ff, /* src_mask */
 265          0x00ff, /* dst_mask */
 266          false), /* pcrel_offset */
 267
 268   /* A 3 bit absolute relocation.  */
 269   HOWTO (R_XGATE_IMM3, /* type */
 270          8, /* rightshift */
 271          1, /* size (0 = byte, 1 = short, 2 = long) */
 272          16, /* bitsize */
 273          false, /* pc_relative */
 274          0, /* bitpos */
 275          complain_overflow_dont, /* complain_on_overflow */
 276          bfd_elf_generic_reloc, /* special_function */
 277          "R_XGATE_IMM3", /* name */
 278          false, /* partial_inplace */
 279          0x00ff, /* src_mask */
 280          0x00ff, /* dst_mask */
 281          false), /* pcrel_offset */
 282
 283   /* A 4 bit absolute relocation.  */
 284   HOWTO (R_XGATE_IMM4, /* type */
 285          8, /* rightshift */
 286          1, /* size (0 = byte, 1 = short, 2 = long) */
 287          16, /* bitsize */
 288          false, /* pc_relative */
 289          0, /* bitpos */
 290          complain_overflow_dont, /* complain_on_overflow */
 291          bfd_elf_generic_reloc, /* special_function */
 292          "R_XGATE_IMM4", /* name */
 293          false, /* partial_inplace */
 294          0x00ff, /* src_mask */
 295          0x00ff, /* dst_mask */
 296          false), /* pcrel_offset */
 297
 298   /* A 5 bit absolute relocation.  */
 299   HOWTO (R_XGATE_IMM5, /* type */
 300          8, /* rightshift */
 301          1, /* size (0 = byte, 1 = short, 2 = long) */
 302          16, /* bitsize */
 303          false, /* pc_relative */
 304          0, /* bitpos */
 305          complain_overflow_dont, /* complain_on_overflow */
 306          bfd_elf_generic_reloc, /* special_function */
 307          "R_XGATE_IMM5", /* name */
 308          false, /* partial_inplace */
 309          0x00ff, /* src_mask */
 310          0x00ff, /* dst_mask */
 311          false), /* pcrel_offset */
 312
 313   /* Mark beginning of a jump instruction (any form).  */
 314   HOWTO (R_XGATE_RL_JUMP, /* type */
 315          0, /* rightshift */
 316          1, /* size (0 = byte, 1 = short, 2 = long) */
 317          0, /* bitsize */
 318          false, /* pc_relative */
 319          0, /* bitpos */
 320          complain_overflow_dont, /* complain_on_overflow */
 321          xgate_elf_ignore_reloc, /* special_function */
 322          "R_XGATE_RL_JUMP", /* name */
 323          true, /* partial_inplace */
 324          0, /* src_mask */
 325          0, /* dst_mask */
 326          true), /* pcrel_offset */
 327
 328   /* Mark beginning of Gcc relaxation group instruction.  */
 329   HOWTO (R_XGATE_RL_GROUP, /* type */
 330          0, /* rightshift */
 331          1, /* size (0 = byte, 1 = short, 2 = long) */
 332          0, /* bitsize */
 333          false, /* pc_relative */
 334          0, /* bitpos */
 335          complain_overflow_dont, /* complain_on_overflow */
 336          xgate_elf_ignore_reloc, /* special_function */
 337          "R_XGATE_RL_GROUP", /* name */
 338          true, /* partial_inplace */
 339          0, /* src_mask */
 340          0, /* dst_mask */
 341          true), /* pcrel_offset */
 342 };
 343
 344 /* Map BFD reloc types to XGATE ELF reloc types.  */
 345
 346 struct xgate_reloc_map
 347 {
 348   bfd_reloc_code_real_type bfd_reloc_val;
 349   unsigned char elf_reloc_val;
 350 };
 351
 352 static const struct xgate_reloc_map xgate_reloc_map[] =
 353 {
 354   {BFD_RELOC_NONE, R_XGATE_NONE},
 355   {BFD_RELOC_8, R_XGATE_8},
 356   {BFD_RELOC_8_PCREL, R_XGATE_PCREL_8},
 357   {BFD_RELOC_16_PCREL, R_XGATE_PCREL_16},
 358   {BFD_RELOC_16, R_XGATE_16},
 359   {BFD_RELOC_32, R_XGATE_32},
 360
 361   {BFD_RELOC_VTABLE_INHERIT, R_XGATE_GNU_VTINHERIT},
 362   {BFD_RELOC_VTABLE_ENTRY, R_XGATE_GNU_VTENTRY},
 363
 364   {BFD_RELOC_XGATE_LO16, R_XGATE_LO16},
 365   {BFD_RELOC_XGATE_GPAGE, R_XGATE_GPAGE},
 366   {BFD_RELOC_XGATE_24, R_XGATE_24},
 367   {BFD_RELOC_XGATE_PCREL_9, R_XGATE_PCREL_9},
 368   {BFD_RELOC_XGATE_PCREL_10,  R_XGATE_PCREL_10},
 369   {BFD_RELOC_XGATE_IMM8_LO, R_XGATE_IMM8_LO},
 370   {BFD_RELOC_XGATE_IMM8_HI, R_XGATE_IMM8_HI},
 371   {BFD_RELOC_XGATE_IMM3, R_XGATE_IMM3},
 372   {BFD_RELOC_XGATE_IMM4, R_XGATE_IMM4},
 373   {BFD_RELOC_XGATE_IMM5, R_XGATE_IMM5},
 374
 375   {BFD_RELOC_XGATE_RL_JUMP, R_XGATE_RL_JUMP},
 376   {BFD_RELOC_XGATE_RL_GROUP, R_XGATE_RL_GROUP},
 377 };
 378
 379 static reloc_howto_type *
 380 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 381                                  bfd_reloc_code_real_type code)
 382 {
 383   unsigned int i;
 384
 385   for (i = 0; i < ARRAY_SIZE (xgate_reloc_map); i++)
 386     if (xgate_reloc_map[i].bfd_reloc_val == code)
 387       return &elf_xgate_howto_table[xgate_reloc_map[i].elf_reloc_val];
 388
 389   return NULL;
 390 }
 391
 392 static reloc_howto_type *
 393 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
 394 {
 395   unsigned int i;
 396
 397   for (i = 0; i < ARRAY_SIZE (elf_xgate_howto_table); i++)
 398     if (elf_xgate_howto_table[i].name != NULL
 399         && strcasecmp (elf_xgate_howto_table[i].name, r_name) == 0)
 400       return &elf_xgate_howto_table[i];
 401
 402   return NULL;
 403 }
 404
 405 /* Set the howto pointer for an XGATE ELF reloc.  */
 406
 407 static bool
 408 xgate_info_to_howto_rel (bfd *abfd,
 409                          arelent *cache_ptr,
 410                          Elf_Internal_Rela *dst)
 411 {
 412   unsigned int r_type;
 413
 414   r_type = ELF32_R_TYPE (dst->r_info);
 415   if (r_type >= (unsigned int) R_XGATE_max)
 416     {
 417       /* xgettext:c-format */
 418       _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 419                           abfd, r_type);
 420       bfd_set_error (bfd_error_bad_value);
 421       return false;
 422     }
 423   cache_ptr->howto = &elf_xgate_howto_table[r_type];
 424   return true;
 425 }
 426
 427 /* Specific sections:
 428  - The .page0 is a data section that is mapped in [0x0000..0x00FF].
 429    Page0 accesses are faster on the M68HC12.
 430  - The .vectors is the section that represents the interrupt
 431    vectors.
 432  - The .xgate section is starts in 0xE08800 or as xgate sees it 0x0800. */
 433 static const struct bfd_elf_special_section elf32_xgate_special_sections[] =
 434 {
 435   { STRING_COMMA_LEN (".eeprom"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 436   { STRING_COMMA_LEN (".page0"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 437   { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
 438   { STRING_COMMA_LEN (".vectors"), 0, SHT_PROGBITS, SHF_ALLOC },
 439 /*{ STRING_COMMA_LEN (".xgate"),    0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 440   TODO finish this implementation */
 441   { NULL, 0, 0, 0, 0 }
 442 };
 443
 444 /* Hook called when reading symbols. */
 445
 446 static void
 447 elf32_xgate_backend_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
 448                                        asymbol *sym)
 449 {
 450   /* Mark xgate symbols.  */
 451   ((elf_symbol_type *) sym)->internal_elf_sym.st_target_internal = 1;
 452 }
 453
 454 /* This function is used for relocs which are only used for relaxing,
 455    which the linker should otherwise ignore.  */
 456
 457 static bfd_reloc_status_type
 458 xgate_elf_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED,
 459                         arelent *reloc_entry,
 460                         asymbol *symbol ATTRIBUTE_UNUSED,
 461                         void *data ATTRIBUTE_UNUSED,
 462                         asection *input_section,
 463                         bfd *output_bfd,
 464                         char **error_message ATTRIBUTE_UNUSED)
 465 {
 466   if (output_bfd != NULL)
 467     reloc_entry->address += input_section->output_offset;
 468   return bfd_reloc_ok;
 469 }
 470
 471 static bfd_reloc_status_type
 472 xgate_elf_special_reloc (bfd *abfd ATTRIBUTE_UNUSED,
 473                          arelent *reloc_entry ATTRIBUTE_UNUSED,
 474                          asymbol *symbol ATTRIBUTE_UNUSED,
 475                          void *data ATTRIBUTE_UNUSED,
 476                          asection *input_section ATTRIBUTE_UNUSED,
 477                          bfd *output_bfd ATTRIBUTE_UNUSED,
 478                          char **error_message ATTRIBUTE_UNUSED)
 479 {
 480   abort ();
 481 }
 482
 483 static bool
 484 _bfd_xgate_elf_print_private_bfd_data (bfd *abfd, void *ptr)
 485 {
 486   FILE *file = (FILE *) ptr;
 487
 488   BFD_ASSERT (abfd != NULL && ptr != NULL);
 489
 490   /* Print normal ELF private data.  */
 491   _bfd_elf_print_private_bfd_data (abfd, ptr);
 492
 493   /* xgettext:c-format */
 494   fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
 495
 496   if (elf_elfheader (abfd)->e_flags & E_XGATE_I32)
 497     fprintf (file, _("[abi=32-bit int, "));
 498   else
 499     fprintf (file, _("[abi=16-bit int, "));
 500
 501   if (elf_elfheader (abfd)->e_flags & E_XGATE_F64)
 502     fprintf (file, _("64-bit double, "));
 503   else
 504     fprintf (file, _("32-bit double, "));
 505   if (elf_elfheader (abfd)->e_flags & EF_XGATE_MACH)
 506     fprintf (file, _("cpu=XGATE]"));
 507   else
 508     fprintf (file, _("error reading cpu type from elf private data"));
 509   fputc ('\n', file);
 510
 511   return true;
 512 }
 513
 514 #define ELF_ARCH                             bfd_arch_xgate
 515 #define ELF_MACHINE_CODE                     EM_XGATE
 516
 517 #define ELF_MAXPAGESIZE                      0x1000
 518
 519 #define TARGET_BIG_SYM                       xgate_elf32_vec
 520 #define TARGET_BIG_NAME                      "elf32-xgate"
 521
 522 #define elf_info_to_howto_rel                xgate_info_to_howto_rel
 523 #define elf_backend_special_sections         elf32_xgate_special_sections
 524 #define elf_backend_symbol_processing        elf32_xgate_backend_symbol_processing
 525 #define bfd_elf32_bfd_print_private_bfd_data _bfd_xgate_elf_print_private_bfd_data
 526
 527 #include "elf32-target.h"