bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2007 Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.
   5    Written by Steve Chamberlain, <sac@cygnus.com>.
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 #include "sysdep.h"
  25 #include "bfd.h"
  26 #include "libbfd.h"
  27 #include "bfdlink.h"
  28 #include "coff/z8k.h"
  29 #include "coff/internal.h"
  30 #include "libcoff.h"
  31
  32 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  33
  34 static reloc_howto_type r_imm32 =
  35 HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
  36        complain_overflow_bitfield, 0, "r_imm32", TRUE, 0xffffffff,
  37        0xffffffff, FALSE);
  38
  39 static reloc_howto_type r_imm4l =
  40 HOWTO (R_IMM4L, 0, 0, 4, FALSE, 0,
  41        complain_overflow_bitfield, 0, "r_imm4l", TRUE, 0xf, 0xf, FALSE);
  42
  43 static reloc_howto_type r_da =
  44 HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
  45        complain_overflow_bitfield, 0, "r_da", TRUE, 0x0000ffff, 0x0000ffff,
  46        FALSE);
  47
  48 static reloc_howto_type r_imm8 =
  49 HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
  50        complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
  51        FALSE);
  52
  53 static reloc_howto_type r_rel16 =
  54 HOWTO (R_REL16, 0, 1, 16, FALSE, 0,
  55        complain_overflow_bitfield, 0, "r_rel16", TRUE, 0x0000ffff, 0x0000ffff,
  56        TRUE);
  57
  58 static reloc_howto_type r_jr =
  59 HOWTO (R_JR, 1, 0, 8, TRUE, 0, complain_overflow_signed, 0,
  60        "r_jr", TRUE, 0xff, 0xff, TRUE);
  61
  62 static reloc_howto_type r_disp7 =
  63 HOWTO (R_DISP7, 0, 0, 7, TRUE, 0, complain_overflow_bitfield, 0,
  64        "r_disp7", TRUE, 0x7f, 0x7f, TRUE);
  65
  66 static reloc_howto_type r_callr =
  67 HOWTO (R_CALLR, 1, 1, 12, TRUE, 0, complain_overflow_signed, 0,
  68        "r_callr", TRUE, 0xfff, 0xfff, TRUE);
  69
  70 #define BADMAG(x) Z8KBADMAG(x)
  71 #define Z8K 1                   /* Customize coffcode.h.  */
  72 #define __A_MAGIC_SET__
  73
  74 /* Code to swap in the reloc.  */
  75 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  76 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  77 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  78   dst->r_stuff[0] = 'S'; \
  79   dst->r_stuff[1] = 'C';
  80
  81 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  82
  83 static void
  84 rtype2howto (arelent *internal, struct internal_reloc *dst)
  85 {
  86   switch (dst->r_type)
  87     {
  88     default:
  89       abort ();
  90       break;
  91     case R_IMM8:
  92       internal->howto = &r_imm8;
  93       break;
  94      case R_IMM16:
  95       internal->howto = &r_da;
  96       break;
  97     case R_JR:
  98       internal->howto = &r_jr;
  99       break;
 100     case R_DISP7:
 101       internal->howto = &r_disp7;
 102       break;
 103     case R_CALLR:
 104       internal->howto = &r_callr;
 105       break;
 106     case R_REL16:
 107       internal->howto = &r_rel16;
 108       break;
 109     case R_IMM32:
 110       internal->howto = &r_imm32;
 111       break;
 112     case R_IMM4L:
 113       internal->howto = &r_imm4l;
 114       break;
 115     }
 116 }
 117
 118 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
 119
 120 static reloc_howto_type *
 121 coff_z8k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 122                             bfd_reloc_code_real_type code)
 123 {
 124   switch (code)
 125     {
 126     case BFD_RELOC_8:           return & r_imm8;
 127     case BFD_RELOC_16:          return & r_da;
 128     case BFD_RELOC_32:          return & r_imm32;
 129     case BFD_RELOC_8_PCREL:     return & r_jr;
 130     case BFD_RELOC_16_PCREL:    return & r_rel16;
 131     case BFD_RELOC_Z8K_DISP7:   return & r_disp7;
 132     case BFD_RELOC_Z8K_CALLR:   return & r_callr;
 133     case BFD_RELOC_Z8K_IMM4L:   return & r_imm4l;
 134     default:                    BFD_FAIL ();
 135       return 0;
 136     }
 137 }
 138
 139 static reloc_howto_type *
 140 coff_z8k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 141                             const char *r_name)
 142 {
 143   if (strcasecmp (r_imm8.name, r_name) == 0)
 144     return &r_imm8;
 145   if (strcasecmp (r_da.name, r_name) == 0)
 146     return &r_da;
 147   if (strcasecmp (r_imm32.name, r_name) == 0)
 148     return &r_imm32;
 149   if (strcasecmp (r_jr.name, r_name) == 0)
 150     return &r_jr;
 151   if (strcasecmp (r_rel16.name, r_name) == 0)
 152     return &r_rel16;
 153   if (strcasecmp (r_disp7.name, r_name) == 0)
 154     return &r_disp7;
 155   if (strcasecmp (r_callr.name, r_name) == 0)
 156     return &r_callr;
 157   if (strcasecmp (r_imm4l.name, r_name) == 0)
 158     return &r_imm4l;
 159
 160   return NULL;
 161 }
 162
 163 /* Perform any necessary magic to the addend in a reloc entry.  */
 164
 165 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 166  cache_ptr->addend =  ext_reloc.r_offset;
 167
 168 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 169  reloc_processing(relent, reloc, symbols, abfd, section)
 170
 171 static void
 172 reloc_processing (arelent *relent,
 173                   struct internal_reloc *reloc,
 174                   asymbol **symbols,
 175                   bfd *abfd,
 176                   asection *section)
 177 {
 178   relent->address = reloc->r_vaddr;
 179   rtype2howto (relent, reloc);
 180
 181   if (reloc->r_symndx > 0)
 182     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 183   else
 184     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 185
 186   relent->addend = reloc->r_offset;
 187   relent->address -= section->vma;
 188 }
 189
 190 static void
 191 extra_case (bfd *in_abfd,
 192             struct bfd_link_info *link_info,
 193             struct bfd_link_order *link_order,
 194             arelent *reloc,
 195             bfd_byte *data,
 196             unsigned int *src_ptr,
 197             unsigned int *dst_ptr)
 198 {
 199   asection * input_section = link_order->u.indirect.section;
 200
 201   switch (reloc->howto->type)
 202     {
 203     case R_IMM8:
 204       bfd_put_8 (in_abfd,
 205                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 206                  data + *dst_ptr);
 207       (*dst_ptr) += 1;
 208       (*src_ptr) += 1;
 209       break;
 210
 211     case R_IMM32:
 212       /* If no flags are set, assume immediate value.  */
 213       if (! (*reloc->sym_ptr_ptr)->section->flags)
 214         {
 215           bfd_put_32 (in_abfd,
 216                       bfd_coff_reloc16_get_value (reloc, link_info,
 217                                                   input_section),
 218                       data + *dst_ptr);
 219         }
 220       else
 221         {
 222           bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 223                                                     input_section);
 224           /* Addresses are 23 bit, and the layout of those in a 32-bit
 225              value is as follows:
 226                1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
 227              (A - address bits,  x - ignore).  */
 228           dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
 229           bfd_put_32 (in_abfd, dst, data + *dst_ptr);
 230         }
 231       (*dst_ptr) += 4;
 232       (*src_ptr) += 4;
 233       break;
 234
 235     case R_IMM4L:
 236       bfd_put_8 (in_abfd,
 237                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 238                   | (0x0f
 239                      & bfd_coff_reloc16_get_value (reloc, link_info,
 240                                                    input_section))),
 241                  data + *dst_ptr);
 242       (*dst_ptr) += 1;
 243       (*src_ptr) += 1;
 244       break;
 245
 246     case R_IMM16:
 247       bfd_put_16 (in_abfd,
 248                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 249                   data + *dst_ptr);
 250       (*dst_ptr) += 2;
 251       (*src_ptr) += 2;
 252       break;
 253
 254     case R_JR:
 255       {
 256         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 257                                                   input_section);
 258         bfd_vma dot = (*dst_ptr
 259                        + input_section->output_offset
 260                        + input_section->output_section->vma);
 261         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 262                                      word and the pc's been incremented.  */
 263
 264         if (gap & 1)
 265           abort ();
 266         gap /= 2;
 267         if (gap > 128 || gap < -128)
 268           {
 269             if (! ((*link_info->callbacks->reloc_overflow)
 270                    (link_info, NULL,
 271                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 272                     reloc->howto->name, reloc->addend, input_section->owner,
 273                     input_section, reloc->address)))
 274               abort ();
 275           }
 276         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 277         (*dst_ptr)++;
 278         (*src_ptr)++;
 279         break;
 280       }
 281
 282     case R_DISP7:
 283       {
 284         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 285                                                   input_section);
 286         bfd_vma dot = (*dst_ptr
 287                        + input_section->output_offset
 288                        + input_section->output_section->vma);
 289         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 290                                      word and the pc's been incremented.  */
 291
 292         if (gap & 1)
 293           abort ();
 294         gap /= 2;
 295
 296         if (gap > 0 || gap < -127)
 297           {
 298             if (! ((*link_info->callbacks->reloc_overflow)
 299                    (link_info, NULL,
 300                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 301                     reloc->howto->name, reloc->addend, input_section->owner,
 302                     input_section, reloc->address)))
 303               abort ();
 304           }
 305         bfd_put_8 (in_abfd,
 306                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 307                    data + *dst_ptr);
 308         (*dst_ptr)++;
 309         (*src_ptr)++;
 310         break;
 311       }
 312
 313     case R_CALLR:
 314       {
 315         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 316                                                   input_section);
 317         bfd_vma dot = (*dst_ptr
 318                        + input_section->output_offset
 319                        + input_section->output_section->vma);
 320         int gap = dst - dot - 2;
 321
 322         if (gap & 1)
 323           abort ();
 324         if (gap > 4096 || gap < -4095)
 325           {
 326             if (! ((*link_info->callbacks->reloc_overflow)
 327                    (link_info, NULL,
 328                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 329                     reloc->howto->name, reloc->addend, input_section->owner,
 330                     input_section, reloc->address)))
 331               abort ();
 332           }
 333         gap /= 2;
 334         bfd_put_16 (in_abfd,
 335                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 336                     data + *dst_ptr);
 337         (*dst_ptr) += 2;
 338         (*src_ptr) += 2;
 339         break;
 340       }
 341
 342     case R_REL16:
 343       {
 344         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 345                                                   input_section);
 346         bfd_vma dot = (*dst_ptr
 347                        + input_section->output_offset
 348                        + input_section->output_section->vma);
 349         int gap = dst - dot - 2;
 350
 351         if (gap > 32767 || gap < -32768)
 352           {
 353             if (! ((*link_info->callbacks->reloc_overflow)
 354                    (link_info, NULL,
 355                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 356                     reloc->howto->name, reloc->addend, input_section->owner,
 357                     input_section, reloc->address)))
 358               abort ();
 359           }
 360         bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
 361         (*dst_ptr) += 2;
 362         (*src_ptr) += 2;
 363         break;
 364       }
 365
 366     default:
 367       abort ();
 368     }
 369 }
 370
 371 #define coff_reloc16_extra_cases    extra_case
 372 #define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup
 373 #define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
 374
 375 #include "coffcode.h"
 376
 377 #undef  coff_bfd_get_relocated_section_contents
 378 #define coff_bfd_get_relocated_section_contents \
 379   bfd_coff_reloc16_get_relocated_section_contents
 380
 381 #undef  coff_bfd_relax_section
 382 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 383
 384 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)