bfd/elf32-pj.c

   1 /* picoJava specific support for 32-bit ELF
   2    Copyright 1999, 2000, 2001, 2002 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 static bfd_reloc_status_type pj_elf_reloc
  29   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  30 static reloc_howto_type *pj_elf_reloc_type_lookup
  31   PARAMS ((bfd *, bfd_reloc_code_real_type));
  32 static void pj_elf_info_to_howto
  33   PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
  34 static void pj_elf_final_write_processing
  35   PARAMS ((bfd *, bfd_boolean));
  36
  37 static reloc_howto_type pj_elf_howto_table[] =
  38 {
  39   /* No relocation.  */
  40   HOWTO (R_PJ_NONE,             /* type */
  41          0,                     /* rightshift */
  42          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  43          0,                     /* bitsize */
  44          FALSE,                 /* pc_relative */
  45          0,                     /* bitpos */
  46          complain_overflow_dont, /* complain_on_overflow */
  47          pj_elf_reloc,          /* special_function */
  48          "R_PJ_NONE",           /* name */
  49          FALSE,                 /* partial_inplace */
  50          0,                     /* src_mask */
  51          0,                     /* dst_mask */
  52          FALSE),                /* pcrel_offset */
  53
  54   /* 32 bit absolute relocation.  Setting partial_inplace to TRUE and
  55      src_mask to a non-zero value is similar to the COFF toolchain.  */
  56   HOWTO (R_PJ_DATA_DIR32,               /* type */
  57          0,                     /* rightshift */
  58          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  59          32,                    /* bitsize */
  60          FALSE,                 /* pc_relative */
  61          0,                     /* bitpos */
  62          complain_overflow_bitfield, /* complain_on_overflow */
  63          pj_elf_reloc,          /* special_function */
  64          "R_PJ_DIR32",          /* name */
  65          TRUE,                  /* partial_inplace */
  66          0xffffffff,            /* src_mask */
  67          0xffffffff,            /* dst_mask */
  68          FALSE),                /* pcrel_offset */
  69
  70   /* 32 bit PC relative relocation.  */
  71   HOWTO (R_PJ_CODE_REL32,               /* type */
  72          0,                     /* rightshift */
  73          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  74          32,                    /* bitsize */
  75          TRUE,                  /* pc_relative */
  76          0,                     /* bitpos */
  77          complain_overflow_signed, /* complain_on_overflow */
  78          pj_elf_reloc,          /* special_function */
  79          "R_PJ_REL32",          /* name */
  80          FALSE,                 /* partial_inplace */
  81          0,                     /* src_mask */
  82          0xffffffff,            /* dst_mask */
  83          TRUE),                 /* pcrel_offset */
  84
  85 /* 16 bit PC relative relocation.  */
  86   HOWTO (R_PJ_CODE_REL16,               /* type */
  87          0,                     /* rightshift */
  88          1,                     /* size (0 = byte, 1 = short, 2 = long) */
  89          16,                    /* bitsize */
  90          TRUE,                  /* pc_relative */
  91          0,                     /* bitpos */
  92          complain_overflow_signed, /* complain_on_overf6w */
  93          pj_elf_reloc,          /* special_function */
  94          "R_PJ_REL16",          /* name */
  95          FALSE,                 /* partial_inplace */
  96          0xffff,                /* src_mask */
  97          0xffff,                /* dst_mask */
  98          TRUE),                 /* pcrel_offset */
  99   EMPTY_HOWTO (4),
 100   EMPTY_HOWTO (5),
 101   HOWTO (R_PJ_CODE_DIR32,       /* type */
 102          0,                     /* rightshift */
 103          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 104          32,                    /* bitsize */
 105          FALSE,                 /* pc_relative */
 106          0,                     /* bitpos */
 107          complain_overflow_bitfield, /* complain_on_overflow */
 108          pj_elf_reloc,          /* special_function */
 109          "R_PJ_CODE_DIR32",     /* name */
 110          TRUE,                  /* partial_inplace */
 111          0xffffffff,            /* src_mask */
 112          0xffffffff,            /* dst_mask */
 113          FALSE),                /* pcrel_offset */
 114
 115   EMPTY_HOWTO (7),
 116   EMPTY_HOWTO (8),
 117   EMPTY_HOWTO (9),
 118   EMPTY_HOWTO (10),
 119   EMPTY_HOWTO (11),
 120   EMPTY_HOWTO (12),
 121
 122   HOWTO (R_PJ_CODE_LO16,        /* type */
 123          0,                     /* rightshift */
 124          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 125          16,                    /* bitsize */
 126          FALSE,                 /* pc_relative */
 127          0,                     /* bitpos */
 128          complain_overflow_unsigned, /* complain_on_overflow */
 129          pj_elf_reloc,          /* special_function */
 130          "R_PJ_LO16",           /* name */
 131          FALSE,                 /* partial_inplace */
 132          0xffff,                /* src_mask */
 133          0xffff,                /* dst_mask */
 134          TRUE),                 /* pcrel_offset */
 135
 136     HOWTO (R_PJ_CODE_HI16,      /* type */
 137          16,                    /* rightshift */
 138          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 139          16,                    /* bitsize */
 140          FALSE,                 /* pc_relative */
 141          0,                     /* bitpos */
 142          complain_overflow_unsigned, /* complain_on_overflow */
 143          pj_elf_reloc,          /* special_function */
 144          "R_PJ_HI16",           /* name */
 145          FALSE,                 /* partial_inplace */
 146          0xffff,                /* src_mask */
 147          0xffff,                /* dst_mask */
 148          TRUE),                 /* pcrel_offset */
 149
 150   /* GNU extension to record C++ vtable hierarchy */
 151   HOWTO (R_PJ_GNU_VTINHERIT,    /* type */
 152          0,                     /* rightshift */
 153          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 154          0,                     /* bitsize */
 155          FALSE,                 /* pc_relative */
 156          0,                     /* bitpos */
 157          complain_overflow_dont, /* complain_on_overflow */
 158          NULL,                  /* special_function */
 159          "R_PJ_GNU_VTINHERIT",  /* name */
 160          FALSE,                 /* partial_inplace */
 161          0,                     /* src_mask */
 162          0,                     /* dst_mask */
 163          FALSE),                /* pcrel_offset */
 164
 165   /* GNU extension to record C++ vtable member usage */
 166   HOWTO (R_PJ_GNU_VTENTRY,     /* type */
 167          0,                     /* rightshift */
 168          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 169          0,                     /* bitsize */
 170          FALSE,                 /* pc_relative */
 171          0,                     /* bitpos */
 172          complain_overflow_dont, /* complain_on_overflow */
 173          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 174          "R_PJ_GNU_VTENTRY",   /* name */
 175          FALSE,                 /* partial_inplace */
 176          0,                     /* src_mask */
 177          0,                     /* dst_mask */
 178          FALSE),                /* pcrel_offset */
 179 };
 180
 181 /* This function is used for normal relocs.  This is like the COFF
 182    function, and is almost certainly incorrect for other ELF targets.  */
 183
 184 static bfd_reloc_status_type
 185 pj_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
 186           error_message)
 187      bfd *abfd;
 188      arelent *reloc_entry;
 189      asymbol *symbol_in;
 190      PTR data;
 191      asection *input_section;
 192      bfd *output_bfd;
 193      char **error_message ATTRIBUTE_UNUSED;
 194 {
 195   unsigned long insn;
 196   bfd_vma sym_value;
 197   enum elf_pj_reloc_type r_type;
 198   bfd_vma addr = reloc_entry->address;
 199   bfd_byte *hit_data = addr + (bfd_byte *) data;
 200
 201   r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
 202
 203   if (output_bfd != NULL)
 204     {
 205       /* Partial linking--do nothing.  */
 206       reloc_entry->address += input_section->output_offset;
 207       return bfd_reloc_ok;
 208     }
 209
 210   if (symbol_in != NULL
 211       && bfd_is_und_section (symbol_in->section))
 212     return bfd_reloc_undefined;
 213
 214   if (bfd_is_com_section (symbol_in->section))
 215     sym_value = 0;
 216   else
 217     sym_value = (symbol_in->value +
 218                  symbol_in->section->output_section->vma +
 219                  symbol_in->section->output_offset);
 220
 221   switch (r_type)
 222     {
 223     case R_PJ_DATA_DIR32:
 224       insn = bfd_get_32 (abfd, hit_data);
 225       insn += sym_value + reloc_entry->addend;
 226       bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
 227       break;
 228
 229       /* Relocations in code are always bigendian, no matter what the
 230          data endianness is.  */
 231
 232     case R_PJ_CODE_DIR32:
 233       insn = bfd_getb32 (hit_data);
 234       insn += sym_value + reloc_entry->addend;
 235       bfd_putb32 ((bfd_vma) insn, hit_data);
 236       break;
 237
 238     case R_PJ_CODE_REL16:
 239       insn = bfd_getb16 (hit_data);
 240       insn += sym_value + reloc_entry->addend
 241         -  (input_section->output_section->vma
 242             + input_section->output_offset);
 243       bfd_putb16 ((bfd_vma) insn, hit_data);
 244       break;
 245     case R_PJ_CODE_LO16:
 246       insn = bfd_getb16 (hit_data);
 247       insn += sym_value + reloc_entry->addend;
 248       bfd_putb16 ((bfd_vma) insn, hit_data);
 249       break;
 250
 251     case R_PJ_CODE_HI16:
 252       insn = bfd_getb16 (hit_data);
 253       insn += (sym_value + reloc_entry->addend) >> 16;
 254       bfd_putb16 ((bfd_vma) insn, hit_data);
 255       break;
 256
 257     default:
 258       abort ();
 259       break;
 260     }
 261
 262   return bfd_reloc_ok;
 263 }
 264
 265 /* This structure is used to map BFD reloc codes to PJ ELF relocs.  */
 266
 267 struct elf_reloc_map
 268 {
 269   bfd_reloc_code_real_type bfd_reloc_val;
 270   unsigned char elf_reloc_val;
 271 };
 272
 273 /* An array mapping BFD reloc codes to PJ ELF relocs.  */
 274
 275 static const struct elf_reloc_map pj_reloc_map[] =
 276 {
 277     { BFD_RELOC_NONE,           R_PJ_NONE          },
 278     { BFD_RELOC_32,             R_PJ_DATA_DIR32    },
 279     { BFD_RELOC_PJ_CODE_DIR16,  R_PJ_CODE_DIR16    },
 280     { BFD_RELOC_PJ_CODE_DIR32,  R_PJ_CODE_DIR32    },
 281     { BFD_RELOC_PJ_CODE_LO16,   R_PJ_CODE_LO16     },
 282     { BFD_RELOC_PJ_CODE_HI16,   R_PJ_CODE_HI16     },
 283     { BFD_RELOC_PJ_CODE_REL32,  R_PJ_CODE_REL32    },
 284     { BFD_RELOC_PJ_CODE_REL16,  R_PJ_CODE_REL16    },
 285     { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
 286     { BFD_RELOC_VTABLE_ENTRY,   R_PJ_GNU_VTENTRY   },
 287 };
 288
 289 /* Given a BFD reloc code, return the howto structure for the
 290    corresponding PJ ELf reloc.  */
 291
 292 static reloc_howto_type *
 293 pj_elf_reloc_type_lookup (abfd, code)
 294      bfd *abfd ATTRIBUTE_UNUSED;
 295      bfd_reloc_code_real_type code;
 296 {
 297   unsigned int i;
 298
 299   for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
 300     {
 301       if (pj_reloc_map[i].bfd_reloc_val == code)
 302         return &pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
 303     }
 304
 305   return NULL;
 306 }
 307
 308 /* Given an ELF reloc, fill in the howto field of a relent.  */
 309
 310 static void
 311 pj_elf_info_to_howto (abfd, cache_ptr, dst)
 312      bfd *abfd ATTRIBUTE_UNUSED;
 313      arelent *cache_ptr;
 314      Elf_Internal_Rela *dst;
 315 {
 316   unsigned int r;
 317
 318   r = ELF32_R_TYPE (dst->r_info);
 319
 320   BFD_ASSERT (r < (unsigned int) R_PJ_max);
 321
 322   cache_ptr->howto = &pj_elf_howto_table[r];
 323 }
 324
 325 /* Take this moment to fill in the special picoJava bits in the
 326    e_flags field.  */
 327
 328 static void
 329 pj_elf_final_write_processing (abfd, linker)
 330      bfd *abfd;
 331      bfd_boolean linker ATTRIBUTE_UNUSED;
 332 {
 333     elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
 334     elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
 335 }
 336
 337 #define TARGET_BIG_SYM          bfd_elf32_pj_vec
 338 #define TARGET_BIG_NAME         "elf32-pj"
 339 #define TARGET_LITTLE_SYM       bfd_elf32_pjl_vec
 340 #define TARGET_LITTLE_NAME      "elf32-pjl"
 341 #define ELF_ARCH                bfd_arch_pj
 342 #define ELF_MACHINE_CODE        EM_PJ
 343 #define ELF_MACHINE_ALT1        EM_PJ_OLD
 344 #define ELF_MAXPAGESIZE         0x1000
 345 #define bfd_elf32_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
 346 #define bfd_elf32_bfd_reloc_type_lookup              pj_elf_reloc_type_lookup
 347 #define elf_backend_final_write_processing           pj_elf_final_write_processing
 348 #define elf_info_to_howto                            pj_elf_info_to_howto
 349 #include "elf32-target.h"