bfd/coff-tic4x.c

   1 /* BFD back-end for TMS320C4X coff binaries.
   2    Copyright 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2005
   3    Free Software Foundation, Inc.
   4
   5    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz)
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 #include "bfd.h"
  25 #include "sysdep.h"
  26 #include "libbfd.h"
  27 #include "bfdlink.h"
  28 #include "coff/tic4x.h"
  29 #include "coff/internal.h"
  30 #include "libcoff.h"
  31
  32 #undef  F_LSYMS
  33 #define F_LSYMS         F_LSYMS_TICOFF
  34
  35 static bfd_boolean ticoff_bfd_is_local_label_name
  36     PARAMS ((bfd *, const char *));
  37 static bfd_reloc_status_type tic4x_relocation
  38     PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char ** ));
  39 static reloc_howto_type *tic4x_coff_reloc_type_lookup
  40     PARAMS ((bfd *, bfd_reloc_code_real_type ));
  41 static void tic4x_lookup_howto
  42     PARAMS ((arelent *, struct internal_reloc * ));
  43 static reloc_howto_type *coff_tic4x_rtype_to_howto
  44     PARAMS ((bfd *, asection *, struct internal_reloc *, struct coff_link_hash_entry *, struct internal_syment *, bfd_vma * ));
  45 static void tic4x_reloc_processing
  46     PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection * ));
  47
  48
  49 /* Replace the stock _bfd_coff_is_local_label_name to recognize TI COFF local
  50    labels.  */
  51 static bfd_boolean
  52 ticoff_bfd_is_local_label_name (abfd, name)
  53   bfd *abfd ATTRIBUTE_UNUSED;
  54   const char *name;
  55 {
  56   if (TICOFF_LOCAL_LABEL_P(name))
  57     return TRUE;
  58   return FALSE;
  59 }
  60
  61 #define coff_bfd_is_local_label_name ticoff_bfd_is_local_label_name
  62
  63 #define RELOC_PROCESSING(RELENT,RELOC,SYMS,ABFD,SECT)\
  64  tic4x_reloc_processing (RELENT,RELOC,SYMS,ABFD,SECT)
  65
  66 /* Customize coffcode.h; the default coff_ functions are set up to use
  67    COFF2; coff_bad_format_hook uses BADMAG, so set that for COFF2.
  68    The COFF1 and COFF0 vectors use custom _bad_format_hook procs
  69    instead of setting BADMAG.  */
  70 #define BADMAG(x) COFF2_BADMAG(x)
  71
  72 #undef coff_rtype_to_howto
  73 #define coff_rtype_to_howto coff_tic4x_rtype_to_howto
  74
  75 #include "coffcode.h"
  76
  77 static bfd_reloc_status_type
  78 tic4x_relocation (abfd, reloc_entry, symbol, data, input_section,
  79                   output_bfd, error_message)
  80   bfd *abfd ATTRIBUTE_UNUSED;
  81   arelent *reloc_entry;
  82   asymbol *symbol ATTRIBUTE_UNUSED;
  83   PTR data ATTRIBUTE_UNUSED;
  84   asection *input_section;
  85   bfd *output_bfd;
  86   char **error_message ATTRIBUTE_UNUSED;
  87 {
  88   if (output_bfd != (bfd *) NULL)
  89     {
  90       /* This is a partial relocation, and we want to apply the
  91          relocation to the reloc entry rather than the raw data.
  92          Modify the reloc inplace to reflect what we now know.  */
  93       reloc_entry->address += input_section->output_offset;
  94       return bfd_reloc_ok;
  95     }
  96   return bfd_reloc_continue;
  97 }
  98
  99 reloc_howto_type tic4x_howto_table[] =
 100 {
 101     HOWTO(R_RELWORD,     0,  2, 16, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "RELWORD",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 102     HOWTO(R_REL24,       0,  2, 24, FALSE, 0, complain_overflow_bitfield, tic4x_relocation, "REL24",     TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 103     HOWTO(R_RELLONG,     0,  2, 32, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "RELLONG",   TRUE, 0xffffffff, 0xffffffff, FALSE),
 104     HOWTO(R_PCRWORD,     0,  2, 16, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "PCRWORD",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 105     HOWTO(R_PCR24,       0,  2, 24, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "PCR24",     TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 106     HOWTO(R_PARTLS16,    0,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "PARTLS16",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 107     HOWTO(R_PARTMS8,    16,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "PARTMS8",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 108     HOWTO(R_RELWORD,     0,  2, 16, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "ARELWORD",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 109     HOWTO(R_REL24,       0,  2, 24, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "AREL24",    TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 110     HOWTO(R_RELLONG,     0,  2, 32, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "ARELLONG",  TRUE, 0xffffffff, 0xffffffff, FALSE),
 111     HOWTO(R_PCRWORD,     0,  2, 16, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "APCRWORD",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 112     HOWTO(R_PCR24,       0,  2, 24, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "APCR24",    TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 113     HOWTO(R_PARTLS16,    0,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "APARTLS16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 114     HOWTO(R_PARTMS8,    16,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "APARTMS8",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 115 };
 116 #define HOWTO_SIZE (sizeof(tic4x_howto_table) / sizeof(tic4x_howto_table[0]))
 117
 118 #undef coff_bfd_reloc_type_lookup
 119 #define coff_bfd_reloc_type_lookup tic4x_coff_reloc_type_lookup
 120
 121 /* For the case statement use the code values used tc_gen_reloc (defined in
 122    bfd/reloc.c) to map to the howto table entries.  */
 123
 124 static reloc_howto_type *
 125 tic4x_coff_reloc_type_lookup (abfd, code)
 126     bfd *abfd ATTRIBUTE_UNUSED;
 127     bfd_reloc_code_real_type code;
 128 {
 129   unsigned int type;
 130   unsigned int i;
 131
 132   switch (code)
 133     {
 134     case BFD_RELOC_32:          type = R_RELLONG; break;
 135     case BFD_RELOC_24:          type = R_REL24; break;
 136     case BFD_RELOC_16:          type = R_RELWORD; break;
 137     case BFD_RELOC_24_PCREL:    type = R_PCR24; break;
 138     case BFD_RELOC_16_PCREL:    type = R_PCRWORD; break;
 139     case BFD_RELOC_HI16:        type = R_PARTMS8; break;
 140     case BFD_RELOC_LO16:        type = R_PARTLS16; break;
 141     default:
 142       return NULL;
 143     }
 144
 145   for (i = 0; i < HOWTO_SIZE; i++)
 146     {
 147       if (tic4x_howto_table[i].type == type)
 148         return tic4x_howto_table + i;
 149     }
 150   return NULL;
 151 }
 152
 153
 154 /* Code to turn a r_type into a howto ptr, uses the above howto table.
 155    Called after some initial checking by the tic4x_rtype_to_howto fn
 156    below.  */
 157 static void
 158 tic4x_lookup_howto (internal, dst)
 159      arelent *internal;
 160      struct internal_reloc *dst;
 161 {
 162   unsigned int i;
 163   int bank = (dst->r_symndx == -1) ? HOWTO_BANK : 0;
 164
 165   for (i = 0; i < HOWTO_SIZE; i++)
 166     {
 167       if (tic4x_howto_table[i].type == dst->r_type)
 168         {
 169           internal->howto = tic4x_howto_table + i + bank;
 170           return;
 171         }
 172     }
 173
 174   (*_bfd_error_handler) (_("Unrecognized reloc type 0x%x"),
 175                          (unsigned int) dst->r_type);
 176   abort();
 177 }
 178
 179 static reloc_howto_type *
 180 coff_tic4x_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
 181      bfd *abfd ATTRIBUTE_UNUSED;
 182      asection *sec;
 183      struct internal_reloc *rel;
 184      struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
 185      struct internal_syment *sym ATTRIBUTE_UNUSED;
 186      bfd_vma *addendp;
 187 {
 188   arelent genrel;
 189
 190   if (rel->r_symndx == -1 && addendp != NULL)
 191     /* This is a TI "internal relocation", which means that the relocation
 192        amount is the amount by which the current section is being relocated
 193        in the output section.  */
 194     *addendp = (sec->output_section->vma + sec->output_offset) - sec->vma;
 195
 196   tic4x_lookup_howto (&genrel, rel);
 197
 198   return genrel.howto;
 199 }
 200
 201
 202 static void
 203 tic4x_reloc_processing (relent, reloc, symbols, abfd, section)
 204      arelent *relent;
 205      struct internal_reloc *reloc;
 206      asymbol **symbols;
 207      bfd *abfd;
 208      asection *section;
 209 {
 210   asymbol *ptr;
 211
 212   relent->address = reloc->r_vaddr;
 213
 214   if (reloc->r_symndx != -1)
 215     {
 216       if (reloc->r_symndx < 0 || reloc->r_symndx >= obj_conv_table_size (abfd))
 217         {
 218           (*_bfd_error_handler)
 219             (_("%s: warning: illegal symbol index %ld in relocs"),
 220              bfd_get_filename (abfd), reloc->r_symndx);
 221           relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 222           ptr = NULL;
 223         }
 224       else
 225         {
 226           relent->sym_ptr_ptr = (symbols
 227                                  + obj_convert (abfd)[reloc->r_symndx]);
 228           ptr = *(relent->sym_ptr_ptr);
 229         }
 230     }
 231   else
 232     {
 233       relent->sym_ptr_ptr = section->symbol_ptr_ptr;
 234       ptr = *(relent->sym_ptr_ptr);
 235     }
 236
 237   /* The symbols definitions that we have read in have been relocated
 238      as if their sections started at 0.  But the offsets refering to
 239      the symbols in the raw data have not been modified, so we have to
 240      have a negative addend to compensate.
 241
 242      Note that symbols which used to be common must be left alone.  */
 243
 244   /* Calculate any reloc addend by looking at the symbol.  */
 245   CALC_ADDEND (abfd, ptr, *reloc, relent);
 246
 247   relent->address -= section->vma;
 248   /* !!     relent->section = (asection *) NULL;  */
 249
 250   /* Fill in the relent->howto field from reloc->r_type.  */
 251   tic4x_lookup_howto (relent, reloc);
 252 }
 253
 254
 255 /* TI COFF v0, DOS tools (little-endian headers).  */
 256 CREATE_LITTLE_COFF_TARGET_VEC(tic4x_coff0_vec, "coff0-tic4x", HAS_LOAD_PAGE, 0, '_', NULL, (PTR)&ticoff0_swap_table);
 257
 258 /* TI COFF v0, SPARC tools (big-endian headers).  */
 259 CREATE_BIGHDR_COFF_TARGET_VEC(tic4x_coff0_beh_vec, "coff0-beh-tic4x", HAS_LOAD_PAGE, 0, '_', &tic4x_coff0_vec, (PTR)&ticoff0_swap_table);
 260
 261 /* TI COFF v1, DOS tools (little-endian headers).  */
 262 CREATE_LITTLE_COFF_TARGET_VEC(tic4x_coff1_vec, "coff1-tic4x", HAS_LOAD_PAGE, 0, '_', &tic4x_coff0_beh_vec, (PTR)&ticoff1_swap_table);
 263
 264 /* TI COFF v1, SPARC tools (big-endian headers).  */
 265 CREATE_BIGHDR_COFF_TARGET_VEC(tic4x_coff1_beh_vec, "coff1-beh-tic4x", HAS_LOAD_PAGE, 0, '_', &tic4x_coff1_vec, (PTR)&ticoff1_swap_table);
 266
 267 /* TI COFF v2, TI DOS tools output (little-endian headers).  */
 268 CREATE_LITTLE_COFF_TARGET_VEC(tic4x_coff2_vec, "coff2-tic4x", HAS_LOAD_PAGE, 0, '_', &tic4x_coff1_beh_vec, COFF_SWAP_TABLE);
 269
 270 /* TI COFF v2, TI SPARC tools output (big-endian headers).  */
 271 CREATE_BIGHDR_COFF_TARGET_VEC(tic4x_coff2_beh_vec, "coff2-beh-tic4x", HAS_LOAD_PAGE, 0, '_', &tic4x_coff2_vec, COFF_SWAP_TABLE);