bfd/elf32-m68hc12.c

   1 /* Motorola 68HC12-specific support for 32-bit ELF
   2    Copyright 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Stephane Carrez (stcarrez@worldnet.fr)
   4    (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
   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 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "elf/m68hc11.h"
  27
  28 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  29 PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
  30 static void m68hc11_info_to_howto_rel
  31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
  32
  33 /* Use REL instead of RELA to save space */
  34 #define USE_REL
  35
  36 /* The Motorola 68HC11 microcontroler only addresses 64Kb.
  37    We must handle 8 and 16-bit relocations.  The 32-bit relocation
  38    is defined but not used except by gas when -gstabs is used (which
  39    is wrong).
  40    The 3-bit and 16-bit PC rel relocation is only used by 68HC12.  */
  41 static reloc_howto_type elf_m68hc11_howto_table[] = {
  42   /* This reloc does nothing.  */
  43   HOWTO (R_M68HC11_NONE,        /* type */
  44          0,                     /* rightshift */
  45          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  46          32,                    /* bitsize */
  47          false,                 /* pc_relative */
  48          0,                     /* bitpos */
  49          complain_overflow_bitfield,    /* complain_on_overflow */
  50          bfd_elf_generic_reloc, /* special_function */
  51          "R_M68HC11_NONE",      /* name */
  52          false,                 /* partial_inplace */
  53          0,                     /* src_mask */
  54          0,                     /* dst_mask */
  55          false),                /* pcrel_offset */
  56
  57   /* A 8 bit absolute relocation */
  58   HOWTO (R_M68HC11_8,           /* type */
  59          0,                     /* rightshift */
  60          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  61          8,                     /* bitsize */
  62          false,                 /* pc_relative */
  63          0,                     /* bitpos */
  64          complain_overflow_bitfield,    /* complain_on_overflow */
  65          bfd_elf_generic_reloc, /* special_function */
  66          "R_M68HC11_8",         /* name */
  67          false,                 /* partial_inplace */
  68          0x00ff,                /* src_mask */
  69          0x00ff,                /* dst_mask */
  70          false),                /* pcrel_offset */
  71
  72   /* A 8 bit absolute relocation (upper address) */
  73   HOWTO (R_M68HC11_HI8,         /* type */
  74          8,                     /* rightshift */
  75          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  76          8,                     /* bitsize */
  77          false,                 /* pc_relative */
  78          0,                     /* bitpos */
  79          complain_overflow_bitfield,    /* complain_on_overflow */
  80          bfd_elf_generic_reloc, /* special_function */
  81          "R_M68HC11_HI8",       /* name */
  82          false,                 /* partial_inplace */
  83          0x00ff,                /* src_mask */
  84          0x00ff,                /* dst_mask */
  85          false),                /* pcrel_offset */
  86
  87   /* A 8 bit absolute relocation (upper address) */
  88   HOWTO (R_M68HC11_LO8,         /* type */
  89          0,                     /* rightshift */
  90          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  91          8,                     /* bitsize */
  92          false,                 /* pc_relative */
  93          0,                     /* bitpos */
  94          complain_overflow_dont,        /* complain_on_overflow */
  95          bfd_elf_generic_reloc, /* special_function */
  96          "R_M68HC11_LO8",       /* name */
  97          false,                 /* partial_inplace */
  98          0x00ff,                /* src_mask */
  99          0x00ff,                /* dst_mask */
 100          false),                /* pcrel_offset */
 101
 102   /* A 8 bit PC-rel relocation */
 103   HOWTO (R_M68HC11_PCREL_8,     /* type */
 104          0,                     /* rightshift */
 105          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 106          8,                     /* bitsize */
 107          true,                  /* pc_relative */
 108          0,                     /* bitpos */
 109          complain_overflow_bitfield,    /* complain_on_overflow */
 110          bfd_elf_generic_reloc, /* special_function */
 111          "R_M68HC11_PCREL_8",   /* name */
 112          false,                 /* partial_inplace */
 113          0x0,                   /* src_mask */
 114          0x00ff,                /* dst_mask */
 115          false),                /* pcrel_offset */
 116
 117   /* A 16 bit absolute relocation */
 118   HOWTO (R_M68HC11_16,          /* type */
 119          0,                     /* rightshift */
 120          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 121          16,                    /* bitsize */
 122          false,                 /* pc_relative */
 123          0,                     /* bitpos */
 124          complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
 125          bfd_elf_generic_reloc, /* special_function */
 126          "R_M68HC11_16",        /* name */
 127          false,                 /* partial_inplace */
 128          0xffff,                /* src_mask */
 129          0xffff,                /* dst_mask */
 130          false),                /* pcrel_offset */
 131
 132   /* A 32 bit absolute relocation.  This one is never used for the
 133      code relocation.  It's used by gas for -gstabs generation.  */
 134   HOWTO (R_M68HC11_32,          /* type */
 135          0,                     /* rightshift */
 136          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 137          32,                    /* bitsize */
 138          false,                 /* pc_relative */
 139          0,                     /* bitpos */
 140          complain_overflow_bitfield,    /* complain_on_overflow */
 141          bfd_elf_generic_reloc, /* special_function */
 142          "R_M68HC11_32",        /* name */
 143          false,                 /* partial_inplace */
 144          0xffffffff,            /* src_mask */
 145          0xffffffff,            /* dst_mask */
 146          false),                /* pcrel_offset */
 147
 148   /* A 3 bit absolute relocation */
 149   HOWTO (R_M68HC11_3B,          /* type */
 150          0,                     /* rightshift */
 151          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 152          3,                     /* bitsize */
 153          false,                 /* pc_relative */
 154          0,                     /* bitpos */
 155          complain_overflow_bitfield,    /* complain_on_overflow */
 156          bfd_elf_generic_reloc, /* special_function */
 157          "R_M68HC11_4B",        /* name */
 158          false,                 /* partial_inplace */
 159          0x003,                 /* src_mask */
 160          0x003,                 /* dst_mask */
 161          false),                /* pcrel_offset */
 162
 163   /* A 16 bit PC-rel relocation */
 164   HOWTO (R_M68HC11_PCREL_16,    /* type */
 165          0,                     /* rightshift */
 166          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 167          16,                    /* bitsize */
 168          true,                  /* pc_relative */
 169          0,                     /* bitpos */
 170          complain_overflow_dont,        /* complain_on_overflow */
 171          bfd_elf_generic_reloc, /* special_function */
 172          "R_M68HC11_PCREL_16",  /* name */
 173          false,                 /* partial_inplace */
 174          0x0,                   /* src_mask */
 175          0xffff,                /* dst_mask */
 176          false),                /* pcrel_offset */
 177
 178   /* GNU extension to record C++ vtable hierarchy */
 179   HOWTO (R_M68HC11_GNU_VTINHERIT,       /* type */
 180          0,                     /* rightshift */
 181          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 182          0,                     /* bitsize */
 183          false,                 /* pc_relative */
 184          0,                     /* bitpos */
 185          complain_overflow_dont,        /* complain_on_overflow */
 186          NULL,                  /* special_function */
 187          "R_M68HC11_GNU_VTINHERIT",     /* name */
 188          false,                 /* partial_inplace */
 189          0,                     /* src_mask */
 190          0,                     /* dst_mask */
 191          false),                /* pcrel_offset */
 192
 193   /* GNU extension to record C++ vtable member usage */
 194   HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
 195          0,                     /* rightshift */
 196          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 197          0,                     /* bitsize */
 198          false,                 /* pc_relative */
 199          0,                     /* bitpos */
 200          complain_overflow_dont,        /* complain_on_overflow */
 201          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 202          "R_M68HC11_GNU_VTENTRY",       /* name */
 203          false,                 /* partial_inplace */
 204          0,                     /* src_mask */
 205          0,                     /* dst_mask */
 206          false),                /* pcrel_offset */
 207 };
 208
 209 /* Map BFD reloc types to M68HC11 ELF reloc types.  */
 210
 211 struct m68hc11_reloc_map
 212 {
 213   bfd_reloc_code_real_type bfd_reloc_val;
 214   unsigned char elf_reloc_val;
 215 };
 216
 217 static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
 218   {BFD_RELOC_NONE, R_M68HC11_NONE,},
 219   {BFD_RELOC_8, R_M68HC11_8},
 220   {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
 221   {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
 222   {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
 223   {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
 224   {BFD_RELOC_16, R_M68HC11_16},
 225   {BFD_RELOC_32, R_M68HC11_32},
 226   {BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
 227
 228   /* The following relocs are defined but they probably don't work yet.  */
 229   {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
 230   {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
 231 };
 232
 233 static reloc_howto_type *
 234 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
 235      bfd *abfd ATTRIBUTE_UNUSED;
 236      bfd_reloc_code_real_type code;
 237 {
 238   unsigned int i;
 239
 240   for (i = 0;
 241        i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
 242        i++)
 243     {
 244       if (m68hc11_reloc_map[i].bfd_reloc_val == code)
 245         return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
 246     }
 247
 248   return NULL;
 249 }
 250
 251 /* Set the howto pointer for an M68HC11 ELF reloc.  */
 252
 253 static void
 254 m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
 255      bfd *abfd ATTRIBUTE_UNUSED;
 256      arelent *cache_ptr;
 257      Elf32_Internal_Rel *dst;
 258 {
 259   unsigned int r_type;
 260
 261   r_type = ELF32_R_TYPE (dst->r_info);
 262   BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
 263   cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
 264 }
 265
 266 /* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c.
 267    The Motorola spec says to use a different Elf machine code.  */
 268 #define ELF_ARCH                bfd_arch_m68hc12
 269 #define ELF_MACHINE_CODE        EM_68HC12
 270 #define ELF_MAXPAGESIZE         0x1000
 271
 272 #define TARGET_BIG_SYM          bfd_elf32_m68hc12_vec
 273 #define TARGET_BIG_NAME         "elf32-m68hc12"
 274
 275 #define elf_info_to_howto       0
 276 #define elf_info_to_howto_rel   m68hc11_info_to_howto_rel
 277 #define elf_backend_object_p    0
 278 #define elf_backend_final_write_processing      0
 279
 280 #include "elf32-target.h"