bfd/coff-m88k.c

   1 /* BFD back-end for Motorola 88000 COFF "Binary Compatability Standard" files.
   2    Copyright 1990, 91, 92, 93, 94, 95, 97, 98, 1999
   3    Free Software Foundation, Inc.
   4    Written by Cygnus Support.
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #define M88 1           /* Customize various include files */
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "coff/m88k.h"
  27 #include "coff/internal.h"
  28 #include "libcoff.h"
  29
  30 static boolean m88k_is_local_label_name PARAMS ((bfd *, const char *));
  31 static bfd_reloc_status_type m88k_special_reloc
  32   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  33 static void rtype2howto PARAMS ((arelent *, struct internal_reloc *));
  34 static void reloc_processing
  35   PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
  36
  37 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
  38
  39 #define GET_SCNHDR_NRELOC bfd_h_get_32
  40 #define GET_SCNHDR_NLNNO bfd_h_get_32
  41
  42 /* On coff-m88k, local labels start with '@'.  */
  43
  44 #define coff_bfd_is_local_label_name m88k_is_local_label_name
  45
  46 static boolean
  47 m88k_is_local_label_name (abfd, name)
  48      bfd *abfd ATTRIBUTE_UNUSED;
  49      const char *name;
  50 {
  51   return name[0] == '@';
  52 }
  53
  54 static bfd_reloc_status_type
  55 m88k_special_reloc (abfd, reloc_entry, symbol, data,
  56                     input_section, output_bfd, error_message)
  57      bfd *abfd;
  58      arelent *reloc_entry;
  59      asymbol *symbol;
  60      PTR data;
  61      asection *input_section;
  62      bfd *output_bfd;
  63      char **error_message ATTRIBUTE_UNUSED;
  64 {
  65   reloc_howto_type *howto = reloc_entry->howto;
  66
  67   switch (howto->type)
  68     {
  69     case R_HVRT16:
  70     case R_LVRT16:
  71       if (output_bfd != (bfd *) NULL)
  72         {
  73           /* This is a partial relocation, and we want to apply the
  74              relocation to the reloc entry rather than the raw data.
  75              Modify the reloc inplace to reflect what we now know.  */
  76
  77           reloc_entry->address += input_section->output_offset;
  78         }
  79       else
  80         {
  81           bfd_vma output_base = 0;
  82           bfd_vma addr = reloc_entry->address;
  83           bfd_vma x = bfd_get_16 (abfd, (bfd_byte *) data + addr);
  84           asection *reloc_target_output_section;
  85           long relocation = 0;
  86
  87           /* Work out which section the relocation is targetted at and the
  88              initial relocation command value.  */
  89
  90           /* Get symbol value.  (Common symbols are special.)  */
  91           if (bfd_is_com_section (symbol->section))
  92             relocation = 0;
  93           else
  94             relocation = symbol->value;
  95
  96           reloc_target_output_section = symbol->section->output_section;
  97
  98           /* Convert input-section-relative symbol value to absolute.  */
  99           if (output_bfd)
 100             output_base = 0;
 101           else
 102             output_base = reloc_target_output_section->vma;
 103
 104           relocation += output_base + symbol->section->output_offset;
 105
 106           /* Add in supplied addend.  */
 107           relocation += ((reloc_entry->addend << howto->bitsize) + x);
 108
 109           reloc_entry->addend = 0;
 110
 111           relocation >>= (bfd_vma) howto->rightshift;
 112
 113           /* Shift everything up to where it's going to be used */
 114
 115           relocation <<= (bfd_vma) howto->bitpos;
 116
 117           if (relocation)
 118               bfd_put_16 (abfd, relocation, (unsigned char *) data + addr);
 119         }
 120
 121       /* If we are not producing relocateable output, return an error if
 122          the symbol is not defined.  */
 123       if (bfd_is_und_section (symbol->section) && output_bfd == (bfd *) NULL)
 124         return bfd_reloc_undefined;
 125
 126       return bfd_reloc_ok;
 127
 128     default:
 129       if (output_bfd != (bfd *) NULL)
 130         {
 131           /* This is a partial relocation, and we want to apply the
 132              relocation to the reloc entry rather than the raw data.
 133              Modify the reloc inplace to reflect what we now know.  */
 134
 135           reloc_entry->address += input_section->output_offset;
 136           return bfd_reloc_ok;
 137         }
 138       break;
 139     }
 140
 141   if (output_bfd == (bfd *) NULL)
 142     return bfd_reloc_continue;
 143
 144   return bfd_reloc_ok;
 145 }
 146
 147 static reloc_howto_type howto_table[] =
 148 {
 149   HOWTO (R_PCR16L,                      /* type */
 150          02,                            /* rightshift */
 151          1,                             /* size (0 = byte, 1 = short, 2 = long) */
 152          16,                            /* bitsize */
 153          true,                          /* pc_relative */
 154          0,                             /* bitpos */
 155          complain_overflow_signed,      /* complain_on_overflow */
 156          m88k_special_reloc,            /* special_function */
 157          "PCR16L",                      /* name */
 158          false,                         /* partial_inplace */
 159          0x0000ffff,                    /* src_mask */
 160          0x0000ffff,                    /* dst_mask */
 161          true),                         /* pcrel_offset */
 162
 163   HOWTO (R_PCR26L,                      /* type */
 164          02,                            /* rightshift */
 165          2,                             /* size (0 = byte, 1 = short, 2 = long) */
 166          26,                            /* bitsize */
 167          true,                          /* pc_relative */
 168          0,                             /* bitpos */
 169          complain_overflow_signed,      /* complain_on_overflow */
 170          m88k_special_reloc,            /* special_function */
 171          "PCR26L",                      /* name */
 172          false,                         /* partial_inplace */
 173          0x03ffffff,                    /* src_mask */
 174          0x03ffffff,                    /* dst_mask */
 175          true),                         /* pcrel_offset */
 176
 177   HOWTO (R_VRT16,                       /* type */
 178          00,                            /* rightshift */
 179          1,                             /* size (0 = byte, 1 = short, 2 = long) */
 180          16,                            /* bitsize */
 181          false,                         /* pc_relative */
 182          0,                             /* bitpos */
 183          complain_overflow_bitfield,    /* complain_on_overflow */
 184          m88k_special_reloc,            /* special_function */
 185          "VRT16",                       /* name */
 186          false,                         /* partial_inplace */
 187          0x0000ffff,                    /* src_mask */
 188          0x0000ffff,                    /* dst_mask */
 189          true),                         /* pcrel_offset */
 190
 191   HOWTO (R_HVRT16,                      /* type */
 192          16,                            /* rightshift */
 193          1,                             /* size (0 = byte, 1 = short, 2 = long) */
 194          16,                            /* bitsize */
 195          false,                         /* pc_relative */
 196          0,                             /* bitpos */
 197          complain_overflow_dont,        /* complain_on_overflow */
 198          m88k_special_reloc,            /* special_function */
 199          "HVRT16",                      /* name */
 200          false,                         /* partial_inplace */
 201          0x0000ffff,                    /* src_mask */
 202          0x0000ffff,                    /* dst_mask */
 203          true),                         /* pcrel_offset */
 204
 205   HOWTO (R_LVRT16,                      /* type */
 206          00,                            /* rightshift */
 207          1,                             /* size (0 = byte, 1 = short, 2 = long) */
 208          16,                            /* bitsize */
 209          false,                         /* pc_relative */
 210          0,                             /* bitpos */
 211          complain_overflow_dont,        /* complain_on_overflow */
 212          m88k_special_reloc,            /* special_function */
 213          "LVRT16",                      /* name */
 214          false,                         /* partial_inplace */
 215          0x0000ffff,                    /* src_mask */
 216          0x0000ffff,                    /* dst_mask */
 217          true),                         /* pcrel_offset */
 218
 219   HOWTO (R_VRT32,                       /* type */
 220          00,                            /* rightshift */
 221          2,                             /* size (0 = byte, 1 = short, 2 = long) */
 222          32,                            /* bitsize */
 223          false,                         /* pc_relative */
 224          0,                             /* bitpos */
 225          complain_overflow_bitfield,    /* complain_on_overflow */
 226          m88k_special_reloc,            /* special_function */
 227          "VRT32",                       /* name */
 228          false,                         /* partial_inplace */
 229          0xffffffff,                    /* src_mask */
 230          0xffffffff,                    /* dst_mask */
 231          true),                         /* pcrel_offset */
 232 };
 233
 234 /* Code to turn an external r_type into a pointer to an entry in the
 235    above howto table.  */
 236 static void
 237 rtype2howto (cache_ptr, dst)
 238      arelent *cache_ptr;
 239      struct internal_reloc *dst;
 240 {
 241   if (dst->r_type >= R_PCR16L && dst->r_type <= R_VRT32)
 242     {
 243       cache_ptr->howto = howto_table + dst->r_type - R_PCR16L;
 244     }
 245   else
 246     {
 247       BFD_ASSERT (0);
 248     }
 249 }
 250
 251 #define RTYPE2HOWTO(cache_ptr, dst) rtype2howto (cache_ptr, dst)
 252
 253 /* Code to swap in the reloc offset */
 254 #define SWAP_IN_RELOC_OFFSET  bfd_h_get_16
 255 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_16
 256
 257 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section)     \
 258   reloc_processing(relent, reloc, symbols, abfd, section)
 259
 260 static void
 261 reloc_processing (relent, reloc, symbols, abfd, section)
 262      arelent *relent;
 263      struct internal_reloc *reloc;
 264      asymbol **symbols;
 265      bfd *abfd;
 266      asection *section;
 267 {
 268   relent->address = reloc->r_vaddr;
 269   rtype2howto (relent, reloc);
 270
 271   if (((int) reloc->r_symndx) > 0)
 272     {
 273       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 274     }
 275   else
 276     {
 277       relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 278     }
 279
 280   relent->addend = reloc->r_offset;
 281   relent->address -= section->vma;
 282 }
 283
 284 #define BADMAG(x) MC88BADMAG(x)
 285 #include "coffcode.h"
 286
 287 #undef coff_write_armap
 288
 289 CREATE_BIG_COFF_TARGET_VEC (m88kbcs_vec, "coff-m88kbcs", 0, 0, '_', NULL)