bfd/coff-w65.c

   1 /* BFD back-end for WDC 65816 COFF binaries.
   2    Copyright (C) 1995-2017 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 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "coff/w65.h"
  27 #include "coff/internal.h"
  28 #include "libcoff.h"
  29
  30 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  31 static reloc_howto_type howto_table[] =
  32 {
  33   HOWTO (R_W65_ABS8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  34   HOWTO (R_W65_ABS16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  35   HOWTO (R_W65_ABS24,   0,  2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE),
  36   HOWTO (R_W65_ABS8S8,  0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  37   HOWTO (R_W65_ABS8S16, 0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  38   HOWTO (R_W65_ABS16S8, 1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  39   HOWTO (R_W65_ABS16S16,1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  40   HOWTO (R_W65_PCR8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE),
  41   HOWTO (R_W65_PCR16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE),
  42   HOWTO (R_W65_DP,      0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE),
  43 };
  44
  45 #define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0]))
  46
  47 /* Turn a howto into a reloc number.  */
  48
  49 #define SELECT_RELOC(x,howto) \
  50   { x.r_type = select_reloc(howto); }
  51
  52 #define BADMAG(x) (W65BADMAG(x))
  53 #define W65 1                   /* Customize coffcode.h */
  54 #define __A_MAGIC_SET__
  55
  56 /* Code to swap in the reloc */
  57 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  58 #define SWAP_OUT_RELOC_OFFSET   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 static int
  64 select_reloc (reloc_howto_type *howto)
  65 {
  66   return howto->type;
  67 }
  68
  69 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  70
  71 static void
  72 rtype2howto (arelent *internal,
  73              struct internal_reloc *dst)
  74 {
  75   if (dst->r_type > 0 && dst->r_type <= NUM_HOWTOS)
  76     internal->howto = howto_table + dst->r_type - 1;
  77   else
  78     internal->howto = NULL;
  79 }
  80
  81 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  82
  83 /* Perform any necessary magic to the addend in a reloc entry.  */
  84
  85 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  86  cache_ptr->addend =  ext_reloc.r_offset;
  87
  88 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  89  reloc_processing(relent, reloc, symbols, abfd, section)
  90
  91 static void
  92 reloc_processing (arelent * relent,
  93                   struct internal_reloc *reloc,
  94                   asymbol ** symbols,
  95                   bfd * abfd,
  96                   asection * section)
  97 {
  98   relent->address = reloc->r_vaddr;
  99   rtype2howto (relent, reloc);
 100
 101   if (((int) reloc->r_symndx) > 0)
 102     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 103   else
 104     relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
 105
 106   relent->addend = reloc->r_offset;
 107
 108   relent->address -= section->vma;
 109   /*  relent->section = 0;*/
 110 }
 111
 112 static int
 113 w65_reloc16_estimate (bfd *abfd,
 114                       asection *input_section,
 115                       arelent *reloc,
 116                       unsigned int shrink,
 117                       struct bfd_link_info *link_info)
 118 {
 119   bfd_vma value;
 120   bfd_vma dot;
 121   bfd_vma gap;
 122
 123   /* The address of the thing to be relocated will have moved back by
 124      the size of the shrink  - but we don't change reloc->address here,
 125      since we need it to know where the relocation lives in the source
 126      uncooked section.  */
 127
 128   /*  reloc->address -= shrink;   conceptual */
 129
 130   bfd_vma address = reloc->address - shrink;
 131
 132   switch (reloc->howto->type)
 133     {
 134     case R_MOV16B2:
 135     case R_JMP2:
 136       shrink+=2;
 137       break;
 138
 139       /* Thing is a move one byte.  */
 140     case R_MOV16B1:
 141       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 142
 143       if (value >= 0xff00)
 144         {
 145           /* Change the reloc type from 16bit, possible 8 to 8bit
 146              possible 16.  */
 147           reloc->howto = reloc->howto + 1;
 148           /* The place to relc moves back by one.  */
 149           /* This will be two bytes smaller in the long run.  */
 150           shrink += 2;
 151           bfd_perform_slip (abfd, 2, input_section, address);
 152         }
 153
 154       break;
 155       /* This is the 24 bit branch which could become an 8 bitter,
 156          the relocation points to the first byte of the insn, not the
 157          actual data.  */
 158
 159     case R_JMPL1:
 160       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 161
 162       dot = input_section->output_section->vma +
 163         input_section->output_offset + address;
 164
 165       /* See if the address we're looking at within 127 bytes of where
 166          we are, if so then we can use a small branch rather than the
 167          jump we were going to.  */
 168       gap = value - dot;
 169
 170       if (-120 < (long) gap && (long) gap < 120)
 171         {
 172           /* Change the reloc type from 24bit, possible 8 to 8bit
 173              possible 32.  */
 174           reloc->howto = reloc->howto + 1;
 175           /* This will be two bytes smaller in the long run.  */
 176           shrink += 2;
 177           bfd_perform_slip (abfd, 2, input_section, address);
 178         }
 179       break;
 180
 181     case R_JMP1:
 182       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 183
 184       dot = input_section->output_section->vma +
 185         input_section->output_offset + address;
 186
 187       /* See if the address we're looking at within 127 bytes of where
 188          we are, if so then we can use a small branch rather than the
 189          jump we were going to.  */
 190       gap = value - (dot - shrink);
 191
 192       if (-120 < (long) gap && (long) gap < 120)
 193         {
 194           /* Change the reloc type from 16bit, possible 8 to 8bit
 195              possible 16.  */
 196           reloc->howto = reloc->howto + 1;
 197           /* The place to relc moves back by one.  */
 198
 199           /* This will be two bytes smaller in the long run.  */
 200           shrink += 2;
 201           bfd_perform_slip (abfd, 2, input_section, address);
 202         }
 203       break;
 204     }
 205
 206   return shrink;
 207 }
 208
 209 /* First phase of a relaxing link.  */
 210
 211 /* Reloc types
 212    large                small
 213    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 214    R_JMP1               R_JMP2          jmp or pcrel branch
 215    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 216    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b  */
 217
 218 static void
 219 w65_reloc16_extra_cases (bfd *abfd,
 220                          struct bfd_link_info *link_info,
 221                          struct bfd_link_order *link_order,
 222                          arelent *reloc,
 223                          bfd_byte *data,
 224                          unsigned int *src_ptr,
 225                          unsigned int *dst_ptr)
 226 {
 227   unsigned int src_address = *src_ptr;
 228   unsigned int dst_address = *dst_ptr;
 229   asection *input_section = link_order->u.indirect.section;
 230
 231   switch (reloc->howto->type)
 232     {
 233     case R_W65_ABS8:
 234     case R_W65_DP:
 235       {
 236         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 237                                                        input_section);
 238         bfd_put_8 (abfd, gap, data + dst_address);
 239         dst_address += 1;
 240         src_address += 1;
 241       }
 242       break;
 243
 244     case R_W65_ABS8S8:
 245       {
 246         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 247                                                        input_section);
 248         gap >>= 8;
 249         bfd_put_8 (abfd, gap, data + dst_address);
 250         dst_address += 1;
 251         src_address += 1;
 252       }
 253       break;
 254
 255     case R_W65_ABS8S16:
 256       {
 257         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 258                                                        input_section);
 259         gap >>= 16;
 260         bfd_put_8 (abfd, gap, data + dst_address);
 261         dst_address += 1;
 262         src_address += 1;
 263       }
 264       break;
 265
 266     case R_W65_ABS16:
 267       {
 268         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 269                                                        input_section);
 270
 271         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 272         dst_address += 2;
 273         src_address += 2;
 274       }
 275       break;
 276     case R_W65_ABS16S8:
 277       {
 278         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 279                                                        input_section);
 280         gap >>= 8;
 281         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 282         dst_address += 2;
 283         src_address += 2;
 284       }
 285       break;
 286     case R_W65_ABS16S16:
 287       {
 288         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 289                                                        input_section);
 290         gap >>= 16;
 291         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 292         dst_address += 2;
 293         src_address += 2;
 294       }
 295       break;
 296
 297     case R_W65_ABS24:
 298       {
 299         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 300                                                        input_section);
 301         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 302         bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
 303         dst_address += 3;
 304         src_address += 3;
 305       }
 306       break;
 307
 308     case R_W65_PCR8:
 309       {
 310         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 311                                               input_section);
 312         bfd_vma dot = (dst_address
 313                        + input_section->output_offset
 314                        + input_section->output_section->vma);
 315
 316         gap -= dot + 1;
 317         if (gap < -128 || gap > 127)
 318           (*link_info->callbacks->reloc_overflow)
 319             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 320              reloc->howto->name, reloc->addend, input_section->owner,
 321              input_section, reloc->address);
 322
 323         bfd_put_8 (abfd, gap, data + dst_address);
 324         dst_address += 1;
 325         src_address += 1;
 326       }
 327       break;
 328
 329     case R_W65_PCR16:
 330       {
 331         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 332                                                   input_section);
 333         bfd_vma dot = (dst_address
 334                        + input_section->output_offset
 335                        + input_section->output_section->vma);
 336
 337         /* This wraps within the page, so ignore the relativeness, look at the
 338            high part.  */
 339         if ((gap & 0xf0000) != (dot & 0xf0000))
 340           (*link_info->callbacks->reloc_overflow)
 341             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 342              reloc->howto->name, reloc->addend, input_section->owner,
 343              input_section, reloc->address);
 344
 345         gap -= dot + 2;
 346         bfd_put_16 (abfd, gap, data + dst_address);
 347         dst_address += 2;
 348         src_address += 2;
 349       }
 350       break;
 351     default:
 352       printf (_("ignoring reloc %s\n"), reloc->howto->name);
 353       break;
 354
 355     }
 356   *src_ptr = src_address;
 357   *dst_ptr = dst_address;
 358 }
 359
 360 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
 361 #define coff_reloc16_estimate w65_reloc16_estimate
 362
 363 #ifndef bfd_pe_print_pdata
 364 #define bfd_pe_print_pdata      NULL
 365 #endif
 366
 367 #include "coffcode.h"
 368
 369 #undef coff_bfd_get_relocated_section_contents
 370 #undef coff_bfd_relax_section
 371 #define coff_bfd_get_relocated_section_contents \
 372   bfd_coff_reloc16_get_relocated_section_contents
 373 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 374
 375 CREATE_LITTLE_COFF_TARGET_VEC (w65_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)