bfd/coff-w65.c

   1 /* BFD back-end for WDC 65816 COFF binaries.
   2    Copyright 1995, 96, 1997 Free Software Foundation, Inc.
   3    Written by Steve Chamberlain, <sac@cygnus.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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 #include "bfdlink.h"
  25 #include "coff/w65.h"
  26 #include "coff/internal.h"
  27 #include "libcoff.h"
  28
  29 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  30 static reloc_howto_type howto_table[] =
  31 {
  32   HOWTO (R_W65_ABS8,    0,  0, 8, false, 0, complain_overflow_bitfield, 0, "abs8", true, 0x000000ff, 0x000000ff, false),
  33   HOWTO (R_W65_ABS16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "abs16", true, 0x0000ffff, 0x0000ffff, false),
  34   HOWTO (R_W65_ABS24,   0,  2, 32, false, 0, complain_overflow_bitfield, 0, "abs24", true, 0x00ffffff, 0x00ffffff, false),
  35   HOWTO (R_W65_ABS8S8,  0,  0, 8, false, 0, complain_overflow_bitfield, 0, ">abs8", true, 0x000000ff, 0x000000ff, false),
  36   HOWTO (R_W65_ABS8S16, 0,  0, 8, false, 0, complain_overflow_bitfield, 0, "^abs8", true, 0x000000ff, 0x000000ff, false),
  37   HOWTO (R_W65_ABS16S8, 1,  0, 16, false, 0, complain_overflow_bitfield, 0, ">abs16", true, 0x0000ffff, 0x0000ffff, false),
  38   HOWTO (R_W65_ABS16S16,1,  0, 16, false, 0, complain_overflow_bitfield, 0, "^abs16", true, 0x0000ffff, 0x0000ffff, false),
  39   HOWTO (R_W65_PCR8,    0,  0, 8, false, 0, complain_overflow_bitfield, 0, "pcrel8", true, 0x000000ff, 0x000000ff, true),
  40   HOWTO (R_W65_PCR16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "pcrel16", true, 0x0000ffff, 0x0000ffff, true),
  41   HOWTO (R_W65_DP,    0,  0, 8, false, 0, complain_overflow_bitfield, 0, "dp", true, 0x000000ff, 0x000000ff, false),
  42
  43 };
  44
  45
  46 /* Turn a howto into a reloc number */
  47
  48 #define SELECT_RELOC(x,howto) \
  49   { x.r_type = select_reloc(howto); }
  50
  51 #define BADMAG(x) (W65BADMAG(x))
  52 #define W65 1                   /* Customize coffcode.h */
  53 #define __A_MAGIC_SET__
  54
  55
  56 /* Code to swap in the reloc */
  57 #define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
  58 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
  59 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  60   dst->r_stuff[0] = 'S'; \
  61   dst->r_stuff[1] = 'C';
  62
  63
  64 static int
  65 select_reloc (howto)
  66      reloc_howto_type *howto;
  67 {
  68   return howto->type ;
  69 }
  70
  71 /* Code to turn a r_type into a howto ptr, uses the above howto table
  72    */
  73
  74 static void
  75 rtype2howto (internal, dst)
  76      arelent *internal;
  77      struct internal_reloc *dst;
  78 {
  79       internal->howto = howto_table + dst->r_type - 1;
  80 }
  81
  82 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  83
  84
  85 /* Perform any necessary magic to the addend in a reloc entry */
  86
  87
  88 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  89  cache_ptr->addend =  ext_reloc.r_offset;
  90
  91
  92 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  93  reloc_processing(relent, reloc, symbols, abfd, section)
  94
  95 static void
  96 reloc_processing (relent, reloc, symbols, abfd, section)
  97      arelent * relent;
  98      struct internal_reloc *reloc;
  99      asymbol ** symbols;
 100      bfd * abfd;
 101      asection * section;
 102 {
 103   relent->address = reloc->r_vaddr;
 104   rtype2howto (relent, reloc);
 105
 106   if (((int) reloc->r_symndx) > 0)
 107     {
 108       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 109     }
 110   else
 111     {
 112       relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol);
 113     }
 114
 115
 116
 117   relent->addend = reloc->r_offset;
 118
 119   relent->address -= section->vma;
 120   /*  relent->section = 0;*/
 121 }
 122
 123
 124 static int
 125 h8300_reloc16_estimate(abfd, input_section, reloc, shrink, link_info)
 126      bfd *abfd;
 127      asection *input_section;
 128      arelent *reloc;
 129      unsigned int shrink;
 130      struct bfd_link_info *link_info;
 131 {
 132   bfd_vma value;
 133   bfd_vma dot;
 134   bfd_vma gap;
 135
 136   /* The address of the thing to be relocated will have moved back by
 137    the size of the shrink  - but we don't change reloc->address here,
 138    since we need it to know where the relocation lives in the source
 139    uncooked section */
 140
 141   /*  reloc->address -= shrink;   conceptual */
 142
 143   bfd_vma address = reloc->address - shrink;
 144
 145
 146   switch (reloc->howto->type)
 147     {
 148     case R_MOV16B2:
 149     case R_JMP2:
 150       shrink+=2;
 151       break;
 152
 153       /* Thing is a move one byte */
 154     case R_MOV16B1:
 155       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 156
 157       if (value >= 0xff00)
 158         {
 159
 160           /* Change the reloc type from 16bit, possible 8 to 8bit
 161              possible 16 */
 162           reloc->howto = reloc->howto + 1;
 163           /* The place to relc moves back by one */
 164           /* This will be two bytes smaller in the long run */
 165           shrink +=2 ;
 166           bfd_perform_slip(abfd, 2, input_section, address);
 167         }
 168
 169       break;
 170       /* This is the 24 bit branch which could become an 8 bitter,
 171        the relocation points to the first byte of the insn, not the
 172        actual data */
 173
 174     case R_JMPL1:
 175       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 176
 177       dot = input_section->output_section->vma +
 178         input_section->output_offset + address;
 179
 180       /* See if the address we're looking at within 127 bytes of where
 181          we are, if so then we can use a small branch rather than the
 182          jump we were going to */
 183
 184       gap = value - dot ;
 185
 186       if (-120 < (long)gap && (long)gap < 120 )
 187         {
 188
 189           /* Change the reloc type from 24bit, possible 8 to 8bit
 190              possible 32 */
 191           reloc->howto = reloc->howto + 1;
 192           /* This will be two bytes smaller in the long run */
 193           shrink +=2 ;
 194           bfd_perform_slip(abfd, 2, input_section, address);
 195         }
 196       break;
 197
 198     case R_JMP1:
 199
 200       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 201
 202       dot = input_section->output_section->vma +
 203         input_section->output_offset + address;
 204
 205       /* See if the address we're looking at within 127 bytes of where
 206          we are, if so then we can use a small branch rather than the
 207          jump we were going to */
 208
 209       gap = value - (dot - shrink);
 210
 211
 212       if (-120 < (long)gap && (long)gap < 120 )
 213         {
 214
 215           /* Change the reloc type from 16bit, possible 8 to 8bit
 216              possible 16 */
 217           reloc->howto = reloc->howto + 1;
 218           /* The place to relc moves back by one */
 219
 220           /* This will be two bytes smaller in the long run */
 221           shrink +=2 ;
 222           bfd_perform_slip(abfd, 2, input_section, address);
 223         }
 224       break;
 225     }
 226
 227
 228   return shrink;
 229 }
 230
 231
 232 /* First phase of a relaxing link */
 233
 234 /* Reloc types
 235    large                small
 236    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 237    R_JMP1               R_JMP2          jmp or pcrel branch
 238    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 239    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b
 240
 241 */
 242
 243 static void
 244 h8300_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
 245                            dst_ptr)
 246      bfd *abfd;
 247      struct bfd_link_info *link_info;
 248      struct bfd_link_order *link_order;
 249      arelent *reloc;
 250      bfd_byte *data;
 251      unsigned int *src_ptr;
 252      unsigned int *dst_ptr;
 253 {
 254   unsigned int src_address = *src_ptr;
 255   unsigned int dst_address = *dst_ptr;
 256   asection *input_section = link_order->u.indirect.section;
 257
 258   switch (reloc->howto->type)
 259     {
 260     case R_W65_ABS8:
 261     case R_W65_DP:
 262       {
 263         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 264                                                        input_section);
 265         bfd_put_8 (abfd, gap, data + dst_address);
 266         dst_address += 1;
 267         src_address += 1;
 268       }
 269       break;
 270
 271     case R_W65_ABS8S8:
 272       {
 273         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 274                                                        input_section);
 275         gap >>= 8;
 276         bfd_put_8 (abfd, gap, data + dst_address);
 277         dst_address += 1;
 278         src_address += 1;
 279       }
 280       break;
 281
 282     case R_W65_ABS8S16:
 283       {
 284         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 285                                                        input_section);
 286         gap >>=16;
 287         bfd_put_8 (abfd, gap, data + dst_address);
 288         dst_address += 1;
 289         src_address += 1;
 290       }
 291       break;
 292
 293     case R_W65_ABS16:
 294       {
 295         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 296                                                        input_section);
 297
 298         bfd_put_16 (abfd, gap, data + dst_address);
 299         dst_address += 2;
 300         src_address += 2;
 301       }
 302       break;
 303     case R_W65_ABS16S8:
 304       {
 305         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 306                                                        input_section);
 307         gap >>= 8;
 308         bfd_put_16 (abfd, gap, data + dst_address);
 309         dst_address += 2;
 310         src_address += 2;
 311       }
 312       break;
 313     case R_W65_ABS16S16:
 314       {
 315         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 316                                                        input_section);
 317         gap >>= 16;
 318         bfd_put_16 (abfd, gap, data + dst_address);
 319         dst_address += 2;
 320         src_address += 2;
 321       }
 322       break;
 323
 324     case R_W65_ABS24:
 325       {
 326         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 327                                                        input_section);
 328         bfd_put_16 (abfd, gap, data + dst_address);
 329         bfd_put_8 (abfd, gap>>16, data+dst_address+2);
 330         dst_address += 3;
 331         src_address += 3;
 332       }
 333       break;
 334
 335     case R_W65_PCR8:
 336       {
 337         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 338                                               input_section);
 339         bfd_vma dot = link_order->offset
 340           + dst_address
 341             + link_order->u.indirect.section->output_section->vma;
 342
 343         gap -= dot + 1;
 344         if (gap < -128 || gap > 127) {
 345           if (! ((*link_info->callbacks->reloc_overflow)
 346                  (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 347                   reloc->howto->name, reloc->addend, input_section->owner,
 348                   input_section, reloc->address)))
 349             abort();
 350         }
 351         bfd_put_8 (abfd, gap, data + dst_address);
 352         dst_address += 1;
 353         src_address += 1;
 354       }
 355       break;
 356
 357     case R_W65_PCR16:
 358       {
 359         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 360                                                   input_section);
 361         bfd_vma dot = link_order->offset
 362           + dst_address
 363             + link_order->u.indirect.section->output_section->vma;
 364
 365
 366         /* This wraps within the page, so ignore the relativeness, look at the
 367            high part */
 368         if ((gap & 0xf0000) != (dot & 0xf0000)) {
 369           if (! ((*link_info->callbacks->reloc_overflow)
 370                  (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 371                   reloc->howto->name, reloc->addend, input_section->owner,
 372                   input_section, reloc->address)))
 373             abort();
 374         }
 375
 376         gap -= dot + 2;
 377         bfd_put_16 (abfd, gap, data + dst_address);
 378         dst_address += 2;
 379         src_address += 2;
 380       }
 381       break;
 382     default:
 383       printf(_("ignoring reloc %s\n"), reloc->howto->name);
 384       break;
 385
 386     }
 387   *src_ptr = src_address;
 388   *dst_ptr = dst_address;
 389
 390 }
 391
 392 #define coff_reloc16_extra_cases h8300_reloc16_extra_cases
 393 #define coff_reloc16_estimate h8300_reloc16_estimate
 394
 395 #include "coffcode.h"
 396
 397
 398 #undef coff_bfd_get_relocated_section_contents
 399 #undef coff_bfd_relax_section
 400 #define coff_bfd_get_relocated_section_contents \
 401   bfd_coff_reloc16_get_relocated_section_contents
 402 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 403
 404 CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL)