bfd/elf32-pj.c

   1 /* picoJava specific support for 32-bit ELF
   2    Copyright 1999 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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
  35 static reloc_howto_type pj_elf_howto_table[] =
  36 {
  37   /* No relocation.  */
  38   HOWTO (R_PJ_NONE,             /* type */
  39          0,                     /* rightshift */
  40          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  41          0,                     /* bitsize */
  42          false,                 /* pc_relative */
  43          0,                     /* bitpos */
  44          complain_overflow_dont, /* complain_on_overflow */
  45          pj_elf_reloc,          /* special_function */
  46          "R_PJ_NONE",           /* name */
  47          false,                 /* partial_inplace */
  48          0,                     /* src_mask */
  49          0,                     /* dst_mask */
  50          false),                /* pcrel_offset */
  51
  52   /* 32 bit absolute relocation.  Setting partial_inplace to true and
  53      src_mask to a non-zero value is similar to the COFF toolchain.  */
  54   HOWTO (R_PJ_DATA_DIR32,               /* type */
  55          0,                     /* rightshift */
  56          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  57          32,                    /* bitsize */
  58          false,                 /* pc_relative */
  59          0,                     /* bitpos */
  60          complain_overflow_bitfield, /* complain_on_overflow */
  61          pj_elf_reloc,          /* special_function */
  62          "R_PJ_DIR32",          /* name */
  63          true,                  /* partial_inplace */
  64          0xffffffff,            /* src_mask */
  65          0xffffffff,            /* dst_mask */
  66          false),                /* pcrel_offset */
  67
  68   /* 32 bit PC relative relocation.  */
  69   HOWTO (R_PJ_CODE_REL32,               /* type */
  70          0,                     /* rightshift */
  71          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  72          32,                    /* bitsize */
  73          true,                  /* pc_relative */
  74          0,                     /* bitpos */
  75          complain_overflow_signed, /* complain_on_overflow */
  76          pj_elf_reloc,          /* special_function */
  77          "R_PJ_REL32",          /* name */
  78          false,                 /* partial_inplace */
  79          0,                     /* src_mask */
  80          0xffffffff,            /* dst_mask */
  81          true),                 /* pcrel_offset */
  82
  83 /* 16 bit PC relative relocation.  */
  84   HOWTO (R_PJ_CODE_REL16,               /* type */
  85          0,                     /* rightshift */
  86          1,                     /* size (0 = byte, 1 = short, 2 = long) */
  87          16,                    /* bitsize */
  88          true,                  /* pc_relative */
  89          0,                     /* bitpos */
  90          complain_overflow_signed, /* complain_on_overf6w */
  91          pj_elf_reloc,          /* special_function */
  92          "R_PJ_REL16",          /* name */
  93          false,                 /* partial_inplace */
  94          0xffff,                /* src_mask */
  95          0xffff,                /* dst_mask */
  96          true),                 /* pcrel_offset */
  97   EMPTY_HOWTO (4),
  98   EMPTY_HOWTO (5),
  99   HOWTO (R_PJ_CODE_DIR32,       /* type */
 100          0,                     /* rightshift */
 101          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 102          32,                    /* bitsize */
 103          false,                 /* pc_relative */
 104          0,                     /* bitpos */
 105          complain_overflow_bitfield, /* complain_on_overflow */
 106          pj_elf_reloc,          /* special_function */
 107          "R_PJ_CODE_DIR32",     /* name */
 108          true,                  /* partial_inplace */
 109          0xffffffff,            /* src_mask */
 110          0xffffffff,            /* dst_mask */
 111          false),                /* pcrel_offset */
 112
 113   EMPTY_HOWTO (7),
 114   EMPTY_HOWTO (8),
 115   EMPTY_HOWTO (9),
 116   EMPTY_HOWTO (10),
 117   EMPTY_HOWTO (11),
 118   EMPTY_HOWTO (12),
 119
 120   HOWTO (R_PJ_CODE_LO16,        /* type */
 121          0,                     /* rightshift */
 122          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 123          16,                    /* bitsize */
 124          false,                 /* pc_relative */
 125          0,                     /* bitpos */
 126          complain_overflow_unsigned, /* complain_on_overflow */
 127          pj_elf_reloc,          /* special_function */
 128          "R_PJ_LO16",           /* name */
 129          false,                 /* partial_inplace */
 130          0xffff,                /* src_mask */
 131          0xffff,                /* dst_mask */
 132          true),                 /* pcrel_offset */
 133
 134     HOWTO (R_PJ_CODE_HI16,      /* type */
 135          16,                    /* rightshift */
 136          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 137          16,                    /* bitsize */
 138          false,                 /* pc_relative */
 139          0,                     /* bitpos */
 140          complain_overflow_unsigned, /* complain_on_overflow */
 141          pj_elf_reloc,          /* special_function */
 142          "R_PJ_HI16",           /* name */
 143          false,                 /* partial_inplace */
 144          0xffff,                /* src_mask */
 145          0xffff,                /* dst_mask */
 146          true),                 /* pcrel_offset */
 147
 148   /* GNU extension to record C++ vtable hierarchy */
 149   HOWTO (R_PJ_GNU_VTINHERIT,    /* type */
 150          0,                     /* rightshift */
 151          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 152          0,                     /* bitsize */
 153          false,                 /* pc_relative */
 154          0,                     /* bitpos */
 155          complain_overflow_dont, /* complain_on_overflow */
 156          NULL,                  /* special_function */
 157          "R_PJ_GNU_VTINHERIT",  /* name */
 158          false,                 /* partial_inplace */
 159          0,                     /* src_mask */
 160          0,                     /* dst_mask */
 161          false),                /* pcrel_offset */
 162
 163   /* GNU extension to record C++ vtable member usage */
 164   HOWTO (R_PJ_GNU_VTENTRY,     /* type */
 165          0,                     /* rightshift */
 166          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 167          0,                     /* bitsize */
 168          false,                 /* pc_relative */
 169          0,                     /* bitpos */
 170          complain_overflow_dont, /* complain_on_overflow */
 171          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 172          "R_PJ_GNU_VTENTRY",   /* name */
 173          false,                 /* partial_inplace */
 174          0,                     /* src_mask */
 175          0,                     /* dst_mask */
 176          false),                /* pcrel_offset */
 177
 178 };
 179
 180 /* This function is used for normal relocs.  This is like the COFF
 181    function, and is almost certainly incorrect for other ELF targets.  */
 182
 183 static bfd_reloc_status_type
 184 pj_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
 185           error_message)
 186      bfd *abfd;
 187      arelent *reloc_entry;
 188      asymbol *symbol_in;
 189      PTR data;
 190      asection *input_section;
 191      bfd *output_bfd;
 192      char **error_message ATTRIBUTE_UNUSED;
 193 {
 194   unsigned long insn;
 195   bfd_vma sym_value;
 196   enum elf_pj_reloc_type r_type;
 197   bfd_vma addr = reloc_entry->address;
 198   bfd_byte *hit_data = addr + (bfd_byte *) data;
 199
 200   r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
 201
 202   if (output_bfd != NULL)
 203     {
 204       /* Partial linking--do nothing.  */
 205       reloc_entry->address += input_section->output_offset;
 206       return bfd_reloc_ok;
 207     }
 208
 209   if (symbol_in != NULL
 210       && bfd_is_und_section (symbol_in->section))
 211     return bfd_reloc_undefined;
 212
 213   if (bfd_is_com_section (symbol_in->section))
 214     sym_value = 0;
 215   else
 216     sym_value = (symbol_in->value +
 217                  symbol_in->section->output_section->vma +
 218                  symbol_in->section->output_offset);
 219
 220   switch (r_type)
 221     {
 222     case R_PJ_DATA_DIR32:
 223       insn = bfd_get_32 (abfd, hit_data);
 224       insn += sym_value + reloc_entry->addend;
 225       bfd_put_32 (abfd, insn, hit_data);
 226       break;
 227
 228       /* Relocations in code are always bigendian, no matter what the
 229          data endianness is.  */
 230
 231     case R_PJ_CODE_DIR32:
 232       insn = bfd_getb32 (hit_data);
 233       insn += sym_value + reloc_entry->addend;
 234       bfd_putb32 (insn, hit_data);
 235       break;
 236
 237     case R_PJ_CODE_REL16:
 238       insn = bfd_getb16 (hit_data);
 239       insn += sym_value + reloc_entry->addend
 240         -  (input_section->output_section->vma
 241             + input_section->output_offset);
 242       bfd_putb16 (insn, hit_data);
 243       break;
 244     case R_PJ_CODE_LO16:
 245       insn = bfd_getb16 (hit_data);
 246       insn += sym_value + reloc_entry->addend;
 247       bfd_putb16 (insn, hit_data);
 248       break;
 249
 250     case R_PJ_CODE_HI16:
 251       insn = bfd_getb16 (hit_data);
 252       insn += (sym_value + reloc_entry->addend) >> 16;
 253       bfd_putb16 (insn, hit_data);
 254       break;
 255
 256     default:
 257       abort ();
 258       break;
 259     }
 260
 261   return bfd_reloc_ok;
 262 }
 263
 264 /* This structure is used to map BFD reloc codes to PJ ELF relocs.  */
 265
 266 struct elf_reloc_map
 267 {
 268   bfd_reloc_code_real_type bfd_reloc_val;
 269   unsigned char elf_reloc_val;
 270 };
 271
 272 /* An array mapping BFD reloc codes to PJ ELF relocs.  */
 273
 274 static const struct elf_reloc_map pj_reloc_map[] =
 275 {
 276     { BFD_RELOC_NONE,           R_PJ_NONE          },
 277     { BFD_RELOC_32,             R_PJ_DATA_DIR32    },
 278     { BFD_RELOC_PJ_CODE_DIR16,  R_PJ_CODE_DIR16    },
 279     { BFD_RELOC_PJ_CODE_DIR32,  R_PJ_CODE_DIR32    },
 280     { BFD_RELOC_PJ_CODE_LO16,   R_PJ_CODE_LO16     },
 281     { BFD_RELOC_PJ_CODE_HI16,   R_PJ_CODE_HI16     },
 282     { BFD_RELOC_PJ_CODE_REL32,  R_PJ_CODE_REL32    },
 283     { BFD_RELOC_PJ_CODE_REL16,  R_PJ_CODE_REL16    },
 284     { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
 285     { BFD_RELOC_VTABLE_ENTRY,   R_PJ_GNU_VTENTRY   },
 286 };
 287
 288 /* Given a BFD reloc code, return the howto structure for the
 289    corresponding PJ ELf reloc.  */
 290
 291 static reloc_howto_type *
 292 pj_elf_reloc_type_lookup (abfd, code)
 293      bfd *abfd ATTRIBUTE_UNUSED;
 294      bfd_reloc_code_real_type code;
 295 {
 296   unsigned int i;
 297
 298   for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
 299     {
 300       if (pj_reloc_map[i].bfd_reloc_val == code)
 301         return &pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
 302     }
 303
 304   return NULL;
 305 }
 306
 307 /* Given an ELF reloc, fill in the howto field of a relent.  */
 308
 309 static void
 310 pj_elf_info_to_howto (abfd, cache_ptr, dst)
 311      bfd *abfd ATTRIBUTE_UNUSED;
 312      arelent *cache_ptr;
 313      Elf_Internal_Rela *dst;
 314 {
 315   unsigned int r;
 316
 317   r = ELF32_R_TYPE (dst->r_info);
 318
 319   BFD_ASSERT (r < (unsigned int) R_PJ_max);
 320
 321   cache_ptr->howto = &pj_elf_howto_table[r];
 322 }
 323
 324 /* Take this moment to fill in the special picoJava bits in the
 325    e_flags field.  */
 326
 327 static void
 328 pj_elf_final_write_processing (abfd, linker)
 329      bfd *abfd;
 330      boolean linker ATTRIBUTE_UNUSED;
 331 {
 332     elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
 333     elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
 334 }
 335
 336 #define TARGET_BIG_SYM          bfd_elf32_pj_vec
 337 #define TARGET_BIG_NAME         "elf32-pj"
 338 #define TARGET_LITTLE_SYM       bfd_elf32_pjl_vec
 339 #define TARGET_LITTLE_NAME      "elf32-pjl"
 340 #define ELF_ARCH                bfd_arch_pj
 341 #define ELF_MACHINE_CODE        EM_PJ
 342 #define ELF_MAXPAGESIZE         0x1000
 343 #define bfd_elf32_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
 344 #define bfd_elf32_bfd_reloc_type_lookup              pj_elf_reloc_type_lookup
 345 #define elf_backend_final_write_processing           pj_elf_final_write_processing
 346 #define elf_info_to_howto                            pj_elf_info_to_howto
 347 #include "elf32-target.h"