bfd/coff-w65.c

   1 /* BFD back-end for WDC 65816 COFF binaries.
   2    Copyright (C) 1995-2014 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 /* Turn a howto into a reloc number.  */
  46
  47 #define SELECT_RELOC(x,howto) \
  48   { x.r_type = select_reloc(howto); }
  49
  50 #define BADMAG(x) (W65BADMAG(x))
  51 #define W65 1                   /* Customize coffcode.h */
  52 #define __A_MAGIC_SET__
  53
  54 /* Code to swap in the reloc */
  55 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  56 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  57 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  58   dst->r_stuff[0] = 'S'; \
  59   dst->r_stuff[1] = 'C';
  60
  61 static int
  62 select_reloc (reloc_howto_type *howto)
  63 {
  64   return howto->type ;
  65 }
  66
  67 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  68
  69 static void
  70 rtype2howto (arelent *internal,
  71              struct internal_reloc *dst)
  72 {
  73   internal->howto = howto_table + dst->r_type - 1;
  74 }
  75
  76 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  77
  78 /* Perform any necessary magic to the addend in a reloc entry.  */
  79
  80 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  81  cache_ptr->addend =  ext_reloc.r_offset;
  82
  83 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  84  reloc_processing(relent, reloc, symbols, abfd, section)
  85
  86 static void
  87 reloc_processing (arelent * relent,
  88                   struct internal_reloc *reloc,
  89                   asymbol ** symbols,
  90                   bfd * abfd,
  91                   asection * section)
  92 {
  93   relent->address = reloc->r_vaddr;
  94   rtype2howto (relent, reloc);
  95
  96   if (((int) reloc->r_symndx) > 0)
  97     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
  98   else
  99     relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
 100
 101   relent->addend = reloc->r_offset;
 102
 103   relent->address -= section->vma;
 104   /*  relent->section = 0;*/
 105 }
 106
 107 static int
 108 w65_reloc16_estimate (bfd *abfd,
 109                       asection *input_section,
 110                       arelent *reloc,
 111                       unsigned int shrink,
 112                       struct bfd_link_info *link_info)
 113 {
 114   bfd_vma value;
 115   bfd_vma dot;
 116   bfd_vma gap;
 117
 118   /* The address of the thing to be relocated will have moved back by
 119      the size of the shrink  - but we don't change reloc->address here,
 120      since we need it to know where the relocation lives in the source
 121      uncooked section.  */
 122
 123   /*  reloc->address -= shrink;   conceptual */
 124
 125   bfd_vma address = reloc->address - shrink;
 126
 127   switch (reloc->howto->type)
 128     {
 129     case R_MOV16B2:
 130     case R_JMP2:
 131       shrink+=2;
 132       break;
 133
 134       /* Thing is a move one byte.  */
 135     case R_MOV16B1:
 136       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 137
 138       if (value >= 0xff00)
 139         {
 140           /* Change the reloc type from 16bit, possible 8 to 8bit
 141              possible 16.  */
 142           reloc->howto = reloc->howto + 1;
 143           /* The place to relc moves back by one.  */
 144           /* This will be two bytes smaller in the long run.  */
 145           shrink += 2;
 146           bfd_perform_slip (abfd, 2, input_section, address);
 147         }
 148
 149       break;
 150       /* This is the 24 bit branch which could become an 8 bitter,
 151          the relocation points to the first byte of the insn, not the
 152          actual data.  */
 153
 154     case R_JMPL1:
 155       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 156
 157       dot = input_section->output_section->vma +
 158         input_section->output_offset + address;
 159
 160       /* See if the address we're looking at within 127 bytes of where
 161          we are, if so then we can use a small branch rather than the
 162          jump we were going to.  */
 163       gap = value - dot;
 164
 165       if (-120 < (long) gap && (long) gap < 120)
 166         {
 167           /* Change the reloc type from 24bit, possible 8 to 8bit
 168              possible 32.  */
 169           reloc->howto = reloc->howto + 1;
 170           /* This will be two bytes smaller in the long run.  */
 171           shrink += 2;
 172           bfd_perform_slip (abfd, 2, input_section, address);
 173         }
 174       break;
 175
 176     case R_JMP1:
 177       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 178
 179       dot = input_section->output_section->vma +
 180         input_section->output_offset + address;
 181
 182       /* See if the address we're looking at within 127 bytes of where
 183          we are, if so then we can use a small branch rather than the
 184          jump we were going to.  */
 185       gap = value - (dot - shrink);
 186
 187       if (-120 < (long) gap && (long) gap < 120)
 188         {
 189           /* Change the reloc type from 16bit, possible 8 to 8bit
 190              possible 16.  */
 191           reloc->howto = reloc->howto + 1;
 192           /* The place to relc moves back by one.  */
 193
 194           /* This will be two bytes smaller in the long run.  */
 195           shrink += 2;
 196           bfd_perform_slip (abfd, 2, input_section, address);
 197         }
 198       break;
 199     }
 200
 201   return shrink;
 202 }
 203
 204 /* First phase of a relaxing link.  */
 205
 206 /* Reloc types
 207    large                small
 208    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 209    R_JMP1               R_JMP2          jmp or pcrel branch
 210    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 211    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b  */
 212
 213 static void
 214 w65_reloc16_extra_cases (bfd *abfd,
 215                          struct bfd_link_info *link_info,
 216                          struct bfd_link_order *link_order,
 217                          arelent *reloc,
 218                          bfd_byte *data,
 219                          unsigned int *src_ptr,
 220                          unsigned int *dst_ptr)
 221 {
 222   unsigned int src_address = *src_ptr;
 223   unsigned int dst_address = *dst_ptr;
 224   asection *input_section = link_order->u.indirect.section;
 225
 226   switch (reloc->howto->type)
 227     {
 228     case R_W65_ABS8:
 229     case R_W65_DP:
 230       {
 231         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 232                                                        input_section);
 233         bfd_put_8 (abfd, gap, data + dst_address);
 234         dst_address += 1;
 235         src_address += 1;
 236       }
 237       break;
 238
 239     case R_W65_ABS8S8:
 240       {
 241         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 242                                                        input_section);
 243         gap >>= 8;
 244         bfd_put_8 (abfd, gap, data + dst_address);
 245         dst_address += 1;
 246         src_address += 1;
 247       }
 248       break;
 249
 250     case R_W65_ABS8S16:
 251       {
 252         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 253                                                        input_section);
 254         gap >>= 16;
 255         bfd_put_8 (abfd, gap, data + dst_address);
 256         dst_address += 1;
 257         src_address += 1;
 258       }
 259       break;
 260
 261     case R_W65_ABS16:
 262       {
 263         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 264                                                        input_section);
 265
 266         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 267         dst_address += 2;
 268         src_address += 2;
 269       }
 270       break;
 271     case R_W65_ABS16S8:
 272       {
 273         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 274                                                        input_section);
 275         gap >>= 8;
 276         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 277         dst_address += 2;
 278         src_address += 2;
 279       }
 280       break;
 281     case R_W65_ABS16S16:
 282       {
 283         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 284                                                        input_section);
 285         gap >>= 16;
 286         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 287         dst_address += 2;
 288         src_address += 2;
 289       }
 290       break;
 291
 292     case R_W65_ABS24:
 293       {
 294         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 295                                                        input_section);
 296         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 297         bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
 298         dst_address += 3;
 299         src_address += 3;
 300       }
 301       break;
 302
 303     case R_W65_PCR8:
 304       {
 305         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 306                                               input_section);
 307         bfd_vma dot = (dst_address
 308                        + input_section->output_offset
 309                        + input_section->output_section->vma);
 310
 311         gap -= dot + 1;
 312         if (gap < -128 || gap > 127)
 313           {
 314             if (! ((*link_info->callbacks->reloc_overflow)
 315                    (link_info, NULL,
 316                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 317                     reloc->howto->name, reloc->addend, input_section->owner,
 318                     input_section, reloc->address)))
 319               abort ();
 320           }
 321         bfd_put_8 (abfd, gap, data + dst_address);
 322         dst_address += 1;
 323         src_address += 1;
 324       }
 325       break;
 326
 327     case R_W65_PCR16:
 328       {
 329         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 330                                                   input_section);
 331         bfd_vma dot = (dst_address
 332                        + input_section->output_offset
 333                        + input_section->output_section->vma);
 334
 335         /* This wraps within the page, so ignore the relativeness, look at the
 336            high part.  */
 337         if ((gap & 0xf0000) != (dot & 0xf0000))
 338           {
 339             if (! ((*link_info->callbacks->reloc_overflow)
 340                    (link_info, NULL,
 341                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 342                     reloc->howto->name, reloc->addend, input_section->owner,
 343                     input_section, reloc->address)))
 344               abort ();
 345           }
 346
 347         gap -= dot + 2;
 348         bfd_put_16 (abfd, gap, data + dst_address);
 349         dst_address += 2;
 350         src_address += 2;
 351       }
 352       break;
 353     default:
 354       printf (_("ignoring reloc %s\n"), reloc->howto->name);
 355       break;
 356
 357     }
 358   *src_ptr = src_address;
 359   *dst_ptr = dst_address;
 360 }
 361
 362 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
 363 #define coff_reloc16_estimate w65_reloc16_estimate
 364
 365 #ifndef bfd_pe_print_pdata
 366 #define bfd_pe_print_pdata      NULL
 367 #endif
 368
 369 #include "coffcode.h"
 370
 371 #undef coff_bfd_get_relocated_section_contents
 372 #undef coff_bfd_relax_section
 373 #define coff_bfd_get_relocated_section_contents \
 374   bfd_coff_reloc16_get_relocated_section_contents
 375 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 376
 377 CREATE_LITTLE_COFF_TARGET_VEC (w65_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)