bfd/elf32-pj.c

   1 /* picoJava specific support for 32-bit ELF
   2    Copyright (C) 1999-2024 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       && (symbol_in->flags & BSF_WEAK) == 0
  58       && bfd_is_und_section (symbol_in->section))
  59     return bfd_reloc_undefined;
  60
  61   if (bfd_is_com_section (symbol_in->section))
  62     sym_value = 0;
  63   else
  64     sym_value = (symbol_in->value +
  65                  symbol_in->section->output_section->vma +
  66                  symbol_in->section->output_offset);
  67
  68   switch (r_type)
  69     {
  70     case R_PJ_DATA_DIR32:
  71       insn = bfd_get_32 (abfd, hit_data);
  72       insn += sym_value + reloc_entry->addend;
  73       bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
  74       break;
  75
  76       /* Relocations in code are always bigendian, no matter what the
  77          data endianness is.  */
  78
  79     case R_PJ_CODE_DIR32:
  80       insn = bfd_getb32 (hit_data);
  81       insn += sym_value + reloc_entry->addend;
  82       bfd_putb32 ((bfd_vma) insn, hit_data);
  83       break;
  84
  85     case R_PJ_CODE_REL16:
  86       insn = bfd_getb16 (hit_data);
  87       insn += sym_value + reloc_entry->addend
  88         -  (input_section->output_section->vma
  89             + input_section->output_offset);
  90       bfd_putb16 ((bfd_vma) insn, hit_data);
  91       break;
  92     case R_PJ_CODE_LO16:
  93       insn = bfd_getb16 (hit_data);
  94       insn += sym_value + reloc_entry->addend;
  95       bfd_putb16 ((bfd_vma) insn, hit_data);
  96       break;
  97
  98     case R_PJ_CODE_HI16:
  99       insn = bfd_getb16 (hit_data);
 100       insn += (sym_value + reloc_entry->addend) >> 16;
 101       bfd_putb16 ((bfd_vma) insn, hit_data);
 102       break;
 103
 104     default:
 105       abort ();
 106       break;
 107     }
 108
 109   return bfd_reloc_ok;
 110 }
 111
 112 static reloc_howto_type pj_elf_howto_table[] =
 113 {
 114   /* No relocation.  */
 115   HOWTO (R_PJ_NONE,             /* type */
 116          0,                     /* rightshift */
 117          0,                     /* size */
 118          0,                     /* bitsize */
 119          false,                 /* pc_relative */
 120          0,                     /* bitpos */
 121          complain_overflow_dont, /* complain_on_overflow */
 122          pj_elf_reloc,          /* special_function */
 123          "R_PJ_NONE",           /* name */
 124          false,                 /* partial_inplace */
 125          0,                     /* src_mask */
 126          0,                     /* dst_mask */
 127          false),                /* pcrel_offset */
 128
 129   /* 32 bit absolute relocation.  Setting partial_inplace to TRUE and
 130      src_mask to a non-zero value is similar to the COFF toolchain.  */
 131   HOWTO (R_PJ_DATA_DIR32,       /* type */
 132          0,                     /* rightshift */
 133          4,                     /* size */
 134          32,                    /* bitsize */
 135          false,                 /* pc_relative */
 136          0,                     /* bitpos */
 137          complain_overflow_bitfield, /* complain_on_overflow */
 138          pj_elf_reloc,          /* special_function */
 139          "R_PJ_DIR32",          /* name */
 140          true,                  /* partial_inplace */
 141          0xffffffff,            /* src_mask */
 142          0xffffffff,            /* dst_mask */
 143          false),                /* pcrel_offset */
 144
 145   /* 32 bit PC relative relocation.  */
 146   HOWTO (R_PJ_CODE_REL32,       /* type */
 147          0,                     /* rightshift */
 148          4,                     /* size */
 149          32,                    /* bitsize */
 150          true,                  /* pc_relative */
 151          0,                     /* bitpos */
 152          complain_overflow_signed, /* complain_on_overflow */
 153          pj_elf_reloc,          /* special_function */
 154          "R_PJ_REL32",          /* name */
 155          false,                 /* partial_inplace */
 156          0,                     /* src_mask */
 157          0xffffffff,            /* dst_mask */
 158          true),                 /* pcrel_offset */
 159
 160 /* 16 bit PC relative relocation.  */
 161   HOWTO (R_PJ_CODE_REL16,       /* type */
 162          0,                     /* rightshift */
 163          2,                     /* size */
 164          16,                    /* bitsize */
 165          true,                  /* pc_relative */
 166          0,                     /* bitpos */
 167          complain_overflow_signed, /* complain_on_overf6w */
 168          pj_elf_reloc,          /* special_function */
 169          "R_PJ_REL16",          /* name */
 170          false,                 /* partial_inplace */
 171          0xffff,                /* src_mask */
 172          0xffff,                /* dst_mask */
 173          true),                 /* pcrel_offset */
 174   EMPTY_HOWTO (4),
 175   EMPTY_HOWTO (5),
 176   HOWTO (R_PJ_CODE_DIR32,       /* type */
 177          0,                     /* rightshift */
 178          4,                     /* size */
 179          32,                    /* bitsize */
 180          false,                 /* pc_relative */
 181          0,                     /* bitpos */
 182          complain_overflow_bitfield, /* complain_on_overflow */
 183          pj_elf_reloc,          /* special_function */
 184          "R_PJ_CODE_DIR32",     /* name */
 185          true,                  /* partial_inplace */
 186          0xffffffff,            /* src_mask */
 187          0xffffffff,            /* dst_mask */
 188          false),                /* pcrel_offset */
 189
 190   EMPTY_HOWTO (7),
 191   EMPTY_HOWTO (8),
 192   EMPTY_HOWTO (9),
 193   EMPTY_HOWTO (10),
 194   EMPTY_HOWTO (11),
 195   EMPTY_HOWTO (12),
 196
 197   HOWTO (R_PJ_CODE_LO16,        /* type */
 198          0,                     /* rightshift */
 199          2,                     /* size */
 200          16,                    /* bitsize */
 201          false,                 /* pc_relative */
 202          0,                     /* bitpos */
 203          complain_overflow_unsigned, /* complain_on_overflow */
 204          pj_elf_reloc,          /* special_function */
 205          "R_PJ_LO16",           /* name */
 206          false,                 /* partial_inplace */
 207          0xffff,                /* src_mask */
 208          0xffff,                /* dst_mask */
 209          true),                 /* pcrel_offset */
 210
 211     HOWTO (R_PJ_CODE_HI16,      /* type */
 212          16,                    /* rightshift */
 213          2,                     /* size */
 214          16,                    /* bitsize */
 215          false,                 /* pc_relative */
 216          0,                     /* bitpos */
 217          complain_overflow_unsigned, /* complain_on_overflow */
 218          pj_elf_reloc,          /* special_function */
 219          "R_PJ_HI16",           /* name */
 220          false,                 /* partial_inplace */
 221          0xffff,                /* src_mask */
 222          0xffff,                /* dst_mask */
 223          true),                 /* pcrel_offset */
 224
 225   /* GNU extension to record C++ vtable hierarchy.  */
 226   HOWTO (R_PJ_GNU_VTINHERIT,    /* type */
 227          0,                     /* rightshift */
 228          4,                     /* size */
 229          0,                     /* bitsize */
 230          false,                 /* pc_relative */
 231          0,                     /* bitpos */
 232          complain_overflow_dont, /* complain_on_overflow */
 233          NULL,                  /* special_function */
 234          "R_PJ_GNU_VTINHERIT",  /* name */
 235          false,                 /* partial_inplace */
 236          0,                     /* src_mask */
 237          0,                     /* dst_mask */
 238          false),                /* pcrel_offset */
 239
 240   /* GNU extension to record C++ vtable member usage.  */
 241   HOWTO (R_PJ_GNU_VTENTRY,     /* type */
 242          0,                     /* rightshift */
 243          4,                     /* size */
 244          0,                     /* bitsize */
 245          false,                 /* pc_relative */
 246          0,                     /* bitpos */
 247          complain_overflow_dont, /* complain_on_overflow */
 248          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 249          "R_PJ_GNU_VTENTRY",   /* name */
 250          false,                 /* partial_inplace */
 251          0,                     /* src_mask */
 252          0,                     /* dst_mask */
 253          false),                /* pcrel_offset */
 254 };
 255
 256 /* This structure is used to map BFD reloc codes to PJ ELF relocs.  */
 257
 258 struct elf_reloc_map
 259 {
 260   bfd_reloc_code_real_type bfd_reloc_val;
 261   unsigned char elf_reloc_val;
 262 };
 263
 264 /* An array mapping BFD reloc codes to PJ ELF relocs.  */
 265
 266 static const struct elf_reloc_map pj_reloc_map[] =
 267 {
 268     { BFD_RELOC_NONE,           R_PJ_NONE          },
 269     { BFD_RELOC_32,             R_PJ_DATA_DIR32    },
 270     { BFD_RELOC_PJ_CODE_DIR16,  R_PJ_CODE_DIR16    },
 271     { BFD_RELOC_PJ_CODE_DIR32,  R_PJ_CODE_DIR32    },
 272     { BFD_RELOC_PJ_CODE_LO16,   R_PJ_CODE_LO16     },
 273     { BFD_RELOC_PJ_CODE_HI16,   R_PJ_CODE_HI16     },
 274     { BFD_RELOC_PJ_CODE_REL32,  R_PJ_CODE_REL32    },
 275     { BFD_RELOC_PJ_CODE_REL16,  R_PJ_CODE_REL16    },
 276     { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
 277     { BFD_RELOC_VTABLE_ENTRY,   R_PJ_GNU_VTENTRY   },
 278 };
 279
 280 /* Given a BFD reloc code, return the howto structure for the
 281    corresponding PJ ELf reloc.  */
 282
 283 static reloc_howto_type *
 284 pj_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 285                           bfd_reloc_code_real_type code)
 286 {
 287   unsigned int i;
 288
 289   for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
 290     if (pj_reloc_map[i].bfd_reloc_val == code)
 291       return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
 292
 293   return NULL;
 294 }
 295
 296 static reloc_howto_type *
 297 pj_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 298                           const char *r_name)
 299 {
 300   unsigned int i;
 301
 302   for (i = 0;
 303        i < sizeof (pj_elf_howto_table) / sizeof (pj_elf_howto_table[0]);
 304        i++)
 305     if (pj_elf_howto_table[i].name != NULL
 306         && strcasecmp (pj_elf_howto_table[i].name, r_name) == 0)
 307       return &pj_elf_howto_table[i];
 308
 309   return NULL;
 310 }
 311
 312 /* Given an ELF reloc, fill in the howto field of a relent.  */
 313
 314 static bool
 315 pj_elf_info_to_howto (bfd *abfd,
 316                       arelent *cache_ptr,
 317                       Elf_Internal_Rela *dst)
 318 {
 319   unsigned int r;
 320
 321   r = ELF32_R_TYPE (dst->r_info);
 322
 323   if (r >= R_PJ_max)
 324     {
 325       /* xgettext:c-format */
 326       _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 327                           abfd, r);
 328       bfd_set_error (bfd_error_bad_value);
 329       return false;
 330     }
 331
 332   cache_ptr->howto = &pj_elf_howto_table[r];
 333   return true;
 334 }
 335
 336 /* Take this moment to fill in the special picoJava bits in the
 337    e_flags field.  */
 338
 339 static bool
 340 pj_elf_final_write_processing (bfd *abfd)
 341 {
 342   elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
 343   elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
 344   return _bfd_elf_final_write_processing (abfd);
 345 }
 346
 347 #define TARGET_BIG_SYM          pj_elf32_vec
 348 #define TARGET_BIG_NAME         "elf32-pj"
 349 #define TARGET_LITTLE_SYM       pj_elf32_le_vec
 350 #define TARGET_LITTLE_NAME      "elf32-pjl"
 351 #define ELF_ARCH                bfd_arch_pj
 352 #define ELF_MACHINE_CODE        EM_PJ
 353 #define ELF_MACHINE_ALT1        EM_PJ_OLD
 354 #define ELF_MAXPAGESIZE         0x1000
 355 #define bfd_elf32_bfd_get_relocated_section_contents \
 356   bfd_generic_get_relocated_section_contents
 357 #define bfd_elf32_bfd_reloc_type_lookup         pj_elf_reloc_type_lookup
 358 #define bfd_elf32_bfd_reloc_name_lookup   pj_elf_reloc_name_lookup
 359 #define elf_backend_final_write_processing      pj_elf_final_write_processing
 360 #define elf_info_to_howto                       pj_elf_info_to_howto
 361 #include "elf32-target.h"