bfd/elf32-pj.c

   1 /* picoJava specific support for 32-bit ELF
   2    Copyright (C) 1999-2018 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 3 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,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "bfdlink.h"
  25 #include "libbfd.h"
  26 #include "elf-bfd.h"
  27 #include "elf/pj.h"
  28
  29 /* This function is used for normal relocs.  This is like the COFF
  30    function, and is almost certainly incorrect for other ELF targets.  */
  31
  32 static bfd_reloc_status_type
  33 pj_elf_reloc (bfd *abfd,
  34               arelent *reloc_entry,
  35               asymbol *symbol_in,
  36               void * data,
  37               asection *input_section,
  38               bfd *output_bfd,
  39               char **error_message ATTRIBUTE_UNUSED)
  40 {
  41   unsigned long insn;
  42   bfd_vma sym_value;
  43   enum elf_pj_reloc_type r_type;
  44   bfd_vma addr = reloc_entry->address;
  45   bfd_byte *hit_data = addr + (bfd_byte *) data;
  46
  47   r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
  48
  49   if (output_bfd != NULL)
  50     {
  51       /* Partial linking--do nothing.  */
  52       reloc_entry->address += input_section->output_offset;
  53       return bfd_reloc_ok;
  54     }
  55
  56   if (symbol_in != NULL
  57       && bfd_is_und_section (symbol_in->section))
  58     return bfd_reloc_undefined;
  59
  60   if (bfd_is_com_section (symbol_in->section))
  61     sym_value = 0;
  62   else
  63     sym_value = (symbol_in->value +
  64                  symbol_in->section->output_section->vma +
  65                  symbol_in->section->output_offset);
  66
  67   switch (r_type)
  68     {
  69     case R_PJ_DATA_DIR32:
  70       insn = bfd_get_32 (abfd, hit_data);
  71       insn += sym_value + reloc_entry->addend;
  72       bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
  73       break;
  74
  75       /* Relocations in code are always bigendian, no matter what the
  76          data endianness is.  */
  77
  78     case R_PJ_CODE_DIR32:
  79       insn = bfd_getb32 (hit_data);
  80       insn += sym_value + reloc_entry->addend;
  81       bfd_putb32 ((bfd_vma) insn, hit_data);
  82       break;
  83
  84     case R_PJ_CODE_REL16:
  85       insn = bfd_getb16 (hit_data);
  86       insn += sym_value + reloc_entry->addend
  87         -  (input_section->output_section->vma
  88             + input_section->output_offset);
  89       bfd_putb16 ((bfd_vma) insn, hit_data);
  90       break;
  91     case R_PJ_CODE_LO16:
  92       insn = bfd_getb16 (hit_data);
  93       insn += sym_value + reloc_entry->addend;
  94       bfd_putb16 ((bfd_vma) insn, hit_data);
  95       break;
  96
  97     case R_PJ_CODE_HI16:
  98       insn = bfd_getb16 (hit_data);
  99       insn += (sym_value + reloc_entry->addend) >> 16;
 100       bfd_putb16 ((bfd_vma) insn, hit_data);
 101       break;
 102
 103     default:
 104       abort ();
 105       break;
 106     }
 107
 108   return bfd_reloc_ok;
 109 }
 110
 111 static reloc_howto_type pj_elf_howto_table[] =
 112 {
 113   /* No relocation.  */
 114   HOWTO (R_PJ_NONE,             /* type */
 115          0,                     /* rightshift */
 116          3,                     /* size (0 = byte, 1 = short, 2 = long) */
 117          0,                     /* bitsize */
 118          FALSE,                 /* pc_relative */
 119          0,                     /* bitpos */
 120          complain_overflow_dont, /* complain_on_overflow */
 121          pj_elf_reloc,          /* special_function */
 122          "R_PJ_NONE",           /* name */
 123          FALSE,                 /* partial_inplace */
 124          0,                     /* src_mask */
 125          0,                     /* dst_mask */
 126          FALSE),                /* pcrel_offset */
 127
 128   /* 32 bit absolute relocation.  Setting partial_inplace to TRUE and
 129      src_mask to a non-zero value is similar to the COFF toolchain.  */
 130   HOWTO (R_PJ_DATA_DIR32,       /* type */
 131          0,                     /* rightshift */
 132          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 133          32,                    /* bitsize */
 134          FALSE,                 /* pc_relative */
 135          0,                     /* bitpos */
 136          complain_overflow_bitfield, /* complain_on_overflow */
 137          pj_elf_reloc,          /* special_function */
 138          "R_PJ_DIR32",          /* name */
 139          TRUE,                  /* partial_inplace */
 140          0xffffffff,            /* src_mask */
 141          0xffffffff,            /* dst_mask */
 142          FALSE),                /* pcrel_offset */
 143
 144   /* 32 bit PC relative relocation.  */
 145   HOWTO (R_PJ_CODE_REL32,       /* type */
 146          0,                     /* rightshift */
 147          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 148          32,                    /* bitsize */
 149          TRUE,                  /* pc_relative */
 150          0,                     /* bitpos */
 151          complain_overflow_signed, /* complain_on_overflow */
 152          pj_elf_reloc,          /* special_function */
 153          "R_PJ_REL32",          /* name */
 154          FALSE,                 /* partial_inplace */
 155          0,                     /* src_mask */
 156          0xffffffff,            /* dst_mask */
 157          TRUE),                 /* pcrel_offset */
 158
 159 /* 16 bit PC relative relocation.  */
 160   HOWTO (R_PJ_CODE_REL16,       /* type */
 161          0,                     /* rightshift */
 162          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 163          16,                    /* bitsize */
 164          TRUE,                  /* pc_relative */
 165          0,                     /* bitpos */
 166          complain_overflow_signed, /* complain_on_overf6w */
 167          pj_elf_reloc,          /* special_function */
 168          "R_PJ_REL16",          /* name */
 169          FALSE,                 /* partial_inplace */
 170          0xffff,                /* src_mask */
 171          0xffff,                /* dst_mask */
 172          TRUE),                 /* pcrel_offset */
 173   EMPTY_HOWTO (4),
 174   EMPTY_HOWTO (5),
 175   HOWTO (R_PJ_CODE_DIR32,       /* type */
 176          0,                     /* rightshift */
 177          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 178          32,                    /* bitsize */
 179          FALSE,                 /* pc_relative */
 180          0,                     /* bitpos */
 181          complain_overflow_bitfield, /* complain_on_overflow */
 182          pj_elf_reloc,          /* special_function */
 183          "R_PJ_CODE_DIR32",     /* name */
 184          TRUE,                  /* partial_inplace */
 185          0xffffffff,            /* src_mask */
 186          0xffffffff,            /* dst_mask */
 187          FALSE),                /* pcrel_offset */
 188
 189   EMPTY_HOWTO (7),
 190   EMPTY_HOWTO (8),
 191   EMPTY_HOWTO (9),
 192   EMPTY_HOWTO (10),
 193   EMPTY_HOWTO (11),
 194   EMPTY_HOWTO (12),
 195
 196   HOWTO (R_PJ_CODE_LO16,        /* type */
 197          0,                     /* rightshift */
 198          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 199          16,                    /* bitsize */
 200          FALSE,                 /* pc_relative */
 201          0,                     /* bitpos */
 202          complain_overflow_unsigned, /* complain_on_overflow */
 203          pj_elf_reloc,          /* special_function */
 204          "R_PJ_LO16",           /* name */
 205          FALSE,                 /* partial_inplace */
 206          0xffff,                /* src_mask */
 207          0xffff,                /* dst_mask */
 208          TRUE),                 /* pcrel_offset */
 209
 210     HOWTO (R_PJ_CODE_HI16,      /* type */
 211          16,                    /* rightshift */
 212          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 213          16,                    /* bitsize */
 214          FALSE,                 /* pc_relative */
 215          0,                     /* bitpos */
 216          complain_overflow_unsigned, /* complain_on_overflow */
 217          pj_elf_reloc,          /* special_function */
 218          "R_PJ_HI16",           /* name */
 219          FALSE,                 /* partial_inplace */
 220          0xffff,                /* src_mask */
 221          0xffff,                /* dst_mask */
 222          TRUE),                 /* pcrel_offset */
 223
 224   /* GNU extension to record C++ vtable hierarchy.  */
 225   HOWTO (R_PJ_GNU_VTINHERIT,    /* type */
 226          0,                     /* rightshift */
 227          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 228          0,                     /* bitsize */
 229          FALSE,                 /* pc_relative */
 230          0,                     /* bitpos */
 231          complain_overflow_dont, /* complain_on_overflow */
 232          NULL,                  /* special_function */
 233          "R_PJ_GNU_VTINHERIT",  /* name */
 234          FALSE,                 /* partial_inplace */
 235          0,                     /* src_mask */
 236          0,                     /* dst_mask */
 237          FALSE),                /* pcrel_offset */
 238
 239   /* GNU extension to record C++ vtable member usage.  */
 240   HOWTO (R_PJ_GNU_VTENTRY,     /* type */
 241          0,                     /* rightshift */
 242          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 243          0,                     /* bitsize */
 244          FALSE,                 /* pc_relative */
 245          0,                     /* bitpos */
 246          complain_overflow_dont, /* complain_on_overflow */
 247          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 248          "R_PJ_GNU_VTENTRY",   /* name */
 249          FALSE,                 /* partial_inplace */
 250          0,                     /* src_mask */
 251          0,                     /* dst_mask */
 252          FALSE),                /* pcrel_offset */
 253 };
 254
 255 /* This structure is used to map BFD reloc codes to PJ ELF relocs.  */
 256
 257 struct elf_reloc_map
 258 {
 259   bfd_reloc_code_real_type bfd_reloc_val;
 260   unsigned char elf_reloc_val;
 261 };
 262
 263 /* An array mapping BFD reloc codes to PJ ELF relocs.  */
 264
 265 static const struct elf_reloc_map pj_reloc_map[] =
 266 {
 267     { BFD_RELOC_NONE,           R_PJ_NONE          },
 268     { BFD_RELOC_32,             R_PJ_DATA_DIR32    },
 269     { BFD_RELOC_PJ_CODE_DIR16,  R_PJ_CODE_DIR16    },
 270     { BFD_RELOC_PJ_CODE_DIR32,  R_PJ_CODE_DIR32    },
 271     { BFD_RELOC_PJ_CODE_LO16,   R_PJ_CODE_LO16     },
 272     { BFD_RELOC_PJ_CODE_HI16,   R_PJ_CODE_HI16     },
 273     { BFD_RELOC_PJ_CODE_REL32,  R_PJ_CODE_REL32    },
 274     { BFD_RELOC_PJ_CODE_REL16,  R_PJ_CODE_REL16    },
 275     { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
 276     { BFD_RELOC_VTABLE_ENTRY,   R_PJ_GNU_VTENTRY   },
 277 };
 278
 279 /* Given a BFD reloc code, return the howto structure for the
 280    corresponding PJ ELf reloc.  */
 281
 282 static reloc_howto_type *
 283 pj_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 284                           bfd_reloc_code_real_type code)
 285 {
 286   unsigned int i;
 287
 288   for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
 289     if (pj_reloc_map[i].bfd_reloc_val == code)
 290       return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
 291
 292   return NULL;
 293 }
 294
 295 static reloc_howto_type *
 296 pj_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 297                           const char *r_name)
 298 {
 299   unsigned int i;
 300
 301   for (i = 0;
 302        i < sizeof (pj_elf_howto_table) / sizeof (pj_elf_howto_table[0]);
 303        i++)
 304     if (pj_elf_howto_table[i].name != NULL
 305         && strcasecmp (pj_elf_howto_table[i].name, r_name) == 0)
 306       return &pj_elf_howto_table[i];
 307
 308   return NULL;
 309 }
 310
 311 /* Given an ELF reloc, fill in the howto field of a relent.  */
 312
 313 static void
 314 pj_elf_info_to_howto (bfd *abfd,
 315                       arelent *cache_ptr,
 316                       Elf_Internal_Rela *dst)
 317 {
 318   unsigned int r;
 319
 320   r = ELF32_R_TYPE (dst->r_info);
 321
 322   if (r >= R_PJ_max)
 323     {
 324       /* xgettext:c-format */
 325       _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 326                           abfd, r);
 327       bfd_set_error (bfd_error_bad_value);
 328       r = R_PJ_NONE;
 329     }
 330
 331   cache_ptr->howto = &pj_elf_howto_table[r];
 332 }
 333
 334 /* Take this moment to fill in the special picoJava bits in the
 335    e_flags field.  */
 336
 337 static void
 338 pj_elf_final_write_processing (bfd *abfd,
 339                                bfd_boolean linker ATTRIBUTE_UNUSED)
 340 {
 341   elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
 342   elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
 343 }
 344
 345 #define TARGET_BIG_SYM          pj_elf32_vec
 346 #define TARGET_BIG_NAME         "elf32-pj"
 347 #define TARGET_LITTLE_SYM       pj_elf32_le_vec
 348 #define TARGET_LITTLE_NAME      "elf32-pjl"
 349 #define ELF_ARCH                bfd_arch_pj
 350 #define ELF_MACHINE_CODE        EM_PJ
 351 #define ELF_MACHINE_ALT1        EM_PJ_OLD
 352 #define ELF_MAXPAGESIZE         0x1000
 353 #define bfd_elf32_bfd_get_relocated_section_contents \
 354   bfd_generic_get_relocated_section_contents
 355 #define bfd_elf32_bfd_reloc_type_lookup         pj_elf_reloc_type_lookup
 356 #define bfd_elf32_bfd_reloc_name_lookup   pj_elf_reloc_name_lookup
 357 #define elf_backend_final_write_processing      pj_elf_final_write_processing
 358 #define elf_info_to_howto                       pj_elf_info_to_howto
 359 #include "elf32-target.h"