bfd/elf32-pj.c

   1 /* picoJava specific support for 32-bit ELF
   2    Copyright 1999, 2000, 2001, 2002, 2005 Free Software Foundation, Inc.
   3    Contributed by Steve Chamberlan of Transmeta (sac@pobox.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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "bfdlink.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "elf/pj.h"
  27
  28 /* This function is used for normal relocs.  This is like the COFF
  29    function, and is almost certainly incorrect for other ELF targets.  */
  30
  31 static bfd_reloc_status_type
  32 pj_elf_reloc (bfd *abfd,
  33               arelent *reloc_entry,
  34               asymbol *symbol_in,
  35               void * data,
  36               asection *input_section,
  37               bfd *output_bfd,
  38               char **error_message ATTRIBUTE_UNUSED)
  39 {
  40   unsigned long insn;
  41   bfd_vma sym_value;
  42   enum elf_pj_reloc_type r_type;
  43   bfd_vma addr = reloc_entry->address;
  44   bfd_byte *hit_data = addr + (bfd_byte *) data;
  45
  46   r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
  47
  48   if (output_bfd != NULL)
  49     {
  50       /* Partial linking--do nothing.  */
  51       reloc_entry->address += input_section->output_offset;
  52       return bfd_reloc_ok;
  53     }
  54
  55   if (symbol_in != NULL
  56       && bfd_is_und_section (symbol_in->section))
  57     return bfd_reloc_undefined;
  58
  59   if (bfd_is_com_section (symbol_in->section))
  60     sym_value = 0;
  61   else
  62     sym_value = (symbol_in->value +
  63                  symbol_in->section->output_section->vma +
  64                  symbol_in->section->output_offset);
  65
  66   switch (r_type)
  67     {
  68     case R_PJ_DATA_DIR32:
  69       insn = bfd_get_32 (abfd, hit_data);
  70       insn += sym_value + reloc_entry->addend;
  71       bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
  72       break;
  73
  74       /* Relocations in code are always bigendian, no matter what the
  75          data endianness is.  */
  76
  77     case R_PJ_CODE_DIR32:
  78       insn = bfd_getb32 (hit_data);
  79       insn += sym_value + reloc_entry->addend;
  80       bfd_putb32 ((bfd_vma) insn, hit_data);
  81       break;
  82
  83     case R_PJ_CODE_REL16:
  84       insn = bfd_getb16 (hit_data);
  85       insn += sym_value + reloc_entry->addend
  86         -  (input_section->output_section->vma
  87             + input_section->output_offset);
  88       bfd_putb16 ((bfd_vma) insn, hit_data);
  89       break;
  90     case R_PJ_CODE_LO16:
  91       insn = bfd_getb16 (hit_data);
  92       insn += sym_value + reloc_entry->addend;
  93       bfd_putb16 ((bfd_vma) insn, hit_data);
  94       break;
  95
  96     case R_PJ_CODE_HI16:
  97       insn = bfd_getb16 (hit_data);
  98       insn += (sym_value + reloc_entry->addend) >> 16;
  99       bfd_putb16 ((bfd_vma) insn, hit_data);
 100       break;
 101
 102     default:
 103       abort ();
 104       break;
 105     }
 106
 107   return bfd_reloc_ok;
 108 }
 109
 110 static reloc_howto_type pj_elf_howto_table[] =
 111 {
 112   /* No relocation.  */
 113   HOWTO (R_PJ_NONE,             /* type */
 114          0,                     /* rightshift */
 115          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 116          0,                     /* bitsize */
 117          FALSE,                 /* pc_relative */
 118          0,                     /* bitpos */
 119          complain_overflow_dont, /* complain_on_overflow */
 120          pj_elf_reloc,          /* special_function */
 121          "R_PJ_NONE",           /* name */
 122          FALSE,                 /* partial_inplace */
 123          0,                     /* src_mask */
 124          0,                     /* dst_mask */
 125          FALSE),                /* pcrel_offset */
 126
 127   /* 32 bit absolute relocation.  Setting partial_inplace to TRUE and
 128      src_mask to a non-zero value is similar to the COFF toolchain.  */
 129   HOWTO (R_PJ_DATA_DIR32,       /* type */
 130          0,                     /* rightshift */
 131          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 132          32,                    /* bitsize */
 133          FALSE,                 /* pc_relative */
 134          0,                     /* bitpos */
 135          complain_overflow_bitfield, /* complain_on_overflow */
 136          pj_elf_reloc,          /* special_function */
 137          "R_PJ_DIR32",          /* name */
 138          TRUE,                  /* partial_inplace */
 139          0xffffffff,            /* src_mask */
 140          0xffffffff,            /* dst_mask */
 141          FALSE),                /* pcrel_offset */
 142
 143   /* 32 bit PC relative relocation.  */
 144   HOWTO (R_PJ_CODE_REL32,       /* type */
 145          0,                     /* rightshift */
 146          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 147          32,                    /* bitsize */
 148          TRUE,                  /* pc_relative */
 149          0,                     /* bitpos */
 150          complain_overflow_signed, /* complain_on_overflow */
 151          pj_elf_reloc,          /* special_function */
 152          "R_PJ_REL32",          /* name */
 153          FALSE,                 /* partial_inplace */
 154          0,                     /* src_mask */
 155          0xffffffff,            /* dst_mask */
 156          TRUE),                 /* pcrel_offset */
 157
 158 /* 16 bit PC relative relocation.  */
 159   HOWTO (R_PJ_CODE_REL16,       /* type */
 160          0,                     /* rightshift */
 161          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 162          16,                    /* bitsize */
 163          TRUE,                  /* pc_relative */
 164          0,                     /* bitpos */
 165          complain_overflow_signed, /* complain_on_overf6w */
 166          pj_elf_reloc,          /* special_function */
 167          "R_PJ_REL16",          /* name */
 168          FALSE,                 /* partial_inplace */
 169          0xffff,                /* src_mask */
 170          0xffff,                /* dst_mask */
 171          TRUE),                 /* pcrel_offset */
 172   EMPTY_HOWTO (4),
 173   EMPTY_HOWTO (5),
 174   HOWTO (R_PJ_CODE_DIR32,       /* type */
 175          0,                     /* rightshift */
 176          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 177          32,                    /* bitsize */
 178          FALSE,                 /* pc_relative */
 179          0,                     /* bitpos */
 180          complain_overflow_bitfield, /* complain_on_overflow */
 181          pj_elf_reloc,          /* special_function */
 182          "R_PJ_CODE_DIR32",     /* name */
 183          TRUE,                  /* partial_inplace */
 184          0xffffffff,            /* src_mask */
 185          0xffffffff,            /* dst_mask */
 186          FALSE),                /* pcrel_offset */
 187
 188   EMPTY_HOWTO (7),
 189   EMPTY_HOWTO (8),
 190   EMPTY_HOWTO (9),
 191   EMPTY_HOWTO (10),
 192   EMPTY_HOWTO (11),
 193   EMPTY_HOWTO (12),
 194
 195   HOWTO (R_PJ_CODE_LO16,        /* type */
 196          0,                     /* rightshift */
 197          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 198          16,                    /* bitsize */
 199          FALSE,                 /* pc_relative */
 200          0,                     /* bitpos */
 201          complain_overflow_unsigned, /* complain_on_overflow */
 202          pj_elf_reloc,          /* special_function */
 203          "R_PJ_LO16",           /* name */
 204          FALSE,                 /* partial_inplace */
 205          0xffff,                /* src_mask */
 206          0xffff,                /* dst_mask */
 207          TRUE),                 /* pcrel_offset */
 208
 209     HOWTO (R_PJ_CODE_HI16,      /* type */
 210          16,                    /* rightshift */
 211          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 212          16,                    /* bitsize */
 213          FALSE,                 /* pc_relative */
 214          0,                     /* bitpos */
 215          complain_overflow_unsigned, /* complain_on_overflow */
 216          pj_elf_reloc,          /* special_function */
 217          "R_PJ_HI16",           /* name */
 218          FALSE,                 /* partial_inplace */
 219          0xffff,                /* src_mask */
 220          0xffff,                /* dst_mask */
 221          TRUE),                 /* pcrel_offset */
 222
 223   /* GNU extension to record C++ vtable hierarchy.  */
 224   HOWTO (R_PJ_GNU_VTINHERIT,    /* type */
 225          0,                     /* rightshift */
 226          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 227          0,                     /* bitsize */
 228          FALSE,                 /* pc_relative */
 229          0,                     /* bitpos */
 230          complain_overflow_dont, /* complain_on_overflow */
 231          NULL,                  /* special_function */
 232          "R_PJ_GNU_VTINHERIT",  /* name */
 233          FALSE,                 /* partial_inplace */
 234          0,                     /* src_mask */
 235          0,                     /* dst_mask */
 236          FALSE),                /* pcrel_offset */
 237
 238   /* GNU extension to record C++ vtable member usage.  */
 239   HOWTO (R_PJ_GNU_VTENTRY,     /* type */
 240          0,                     /* rightshift */
 241          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 242          0,                     /* bitsize */
 243          FALSE,                 /* pc_relative */
 244          0,                     /* bitpos */
 245          complain_overflow_dont, /* complain_on_overflow */
 246          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 247          "R_PJ_GNU_VTENTRY",   /* name */
 248          FALSE,                 /* partial_inplace */
 249          0,                     /* src_mask */
 250          0,                     /* dst_mask */
 251          FALSE),                /* pcrel_offset */
 252 };
 253
 254 /* This structure is used to map BFD reloc codes to PJ ELF relocs.  */
 255
 256 struct elf_reloc_map
 257 {
 258   bfd_reloc_code_real_type bfd_reloc_val;
 259   unsigned char elf_reloc_val;
 260 };
 261
 262 /* An array mapping BFD reloc codes to PJ ELF relocs.  */
 263
 264 static const struct elf_reloc_map pj_reloc_map[] =
 265 {
 266     { BFD_RELOC_NONE,           R_PJ_NONE          },
 267     { BFD_RELOC_32,             R_PJ_DATA_DIR32    },
 268     { BFD_RELOC_PJ_CODE_DIR16,  R_PJ_CODE_DIR16    },
 269     { BFD_RELOC_PJ_CODE_DIR32,  R_PJ_CODE_DIR32    },
 270     { BFD_RELOC_PJ_CODE_LO16,   R_PJ_CODE_LO16     },
 271     { BFD_RELOC_PJ_CODE_HI16,   R_PJ_CODE_HI16     },
 272     { BFD_RELOC_PJ_CODE_REL32,  R_PJ_CODE_REL32    },
 273     { BFD_RELOC_PJ_CODE_REL16,  R_PJ_CODE_REL16    },
 274     { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
 275     { BFD_RELOC_VTABLE_ENTRY,   R_PJ_GNU_VTENTRY   },
 276 };
 277
 278 /* Given a BFD reloc code, return the howto structure for the
 279    corresponding PJ ELf reloc.  */
 280
 281 static reloc_howto_type *
 282 pj_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 283                           bfd_reloc_code_real_type code)
 284 {
 285   unsigned int i;
 286
 287   for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
 288     if (pj_reloc_map[i].bfd_reloc_val == code)
 289       return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
 290
 291   return NULL;
 292 }
 293
 294 /* Given an ELF reloc, fill in the howto field of a relent.  */
 295
 296 static void
 297 pj_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
 298                       arelent *cache_ptr,
 299                       Elf_Internal_Rela *dst)
 300 {
 301   unsigned int r;
 302
 303   r = ELF32_R_TYPE (dst->r_info);
 304
 305   BFD_ASSERT (r < (unsigned int) R_PJ_max);
 306
 307   cache_ptr->howto = &pj_elf_howto_table[r];
 308 }
 309
 310 /* Take this moment to fill in the special picoJava bits in the
 311    e_flags field.  */
 312
 313 static void
 314 pj_elf_final_write_processing (bfd *abfd,
 315                                bfd_boolean linker ATTRIBUTE_UNUSED)
 316 {
 317   elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
 318   elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
 319 }
 320
 321 #define TARGET_BIG_SYM          bfd_elf32_pj_vec
 322 #define TARGET_BIG_NAME         "elf32-pj"
 323 #define TARGET_LITTLE_SYM       bfd_elf32_pjl_vec
 324 #define TARGET_LITTLE_NAME      "elf32-pjl"
 325 #define ELF_ARCH                bfd_arch_pj
 326 #define ELF_MACHINE_CODE        EM_PJ
 327 #define ELF_MACHINE_ALT1        EM_PJ_OLD
 328 #define ELF_MAXPAGESIZE         0x1000
 329 #define bfd_elf32_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
 330 #define bfd_elf32_bfd_reloc_type_lookup              pj_elf_reloc_type_lookup
 331 #define elf_backend_final_write_processing           pj_elf_final_write_processing
 332 #define elf_info_to_howto                            pj_elf_info_to_howto
 333 #include "elf32-target.h"