bfd/coff-tic4x.c

   1 /* BFD back-end for TMS320C4X coff binaries.
   2    Copyright (C) 1996-2020 Free Software Foundation, Inc.
   3
   4    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz)
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "libbfd.h"
  26 #include "bfdlink.h"
  27 #include "coff/tic4x.h"
  28 #include "coff/internal.h"
  29 #include "libcoff.h"
  30
  31 #undef  F_LSYMS
  32 #define F_LSYMS         F_LSYMS_TICOFF
  33
  34 static reloc_howto_type *
  35 coff_tic4x_rtype_to_howto (bfd *, asection *, struct internal_reloc *,
  36                            struct coff_link_hash_entry *,
  37                            struct internal_syment *,  bfd_vma *);
  38 static void
  39 tic4x_reloc_processing (arelent *, struct internal_reloc *,
  40                         asymbol **, bfd *, asection *);
  41
  42 /* Replace the stock _bfd_coff_is_local_label_name to recognize TI COFF local
  43    labels.  */
  44 static bfd_boolean
  45 ticoff_bfd_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED,
  46                                 const char *name)
  47 {
  48   if (TICOFF_LOCAL_LABEL_P(name))
  49     return TRUE;
  50   return FALSE;
  51 }
  52
  53 #define coff_bfd_is_local_label_name ticoff_bfd_is_local_label_name
  54
  55 #define RELOC_PROCESSING(RELENT,RELOC,SYMS,ABFD,SECT)\
  56  tic4x_reloc_processing (RELENT,RELOC,SYMS,ABFD,SECT)
  57
  58 /* Customize coffcode.h; the default coff_ functions are set up to use
  59    COFF2; coff_bad_format_hook uses BADMAG, so set that for COFF2.
  60    The COFF1 and COFF0 vectors use custom _bad_format_hook procs
  61    instead of setting BADMAG.  */
  62 #define BADMAG(x) COFF2_BADMAG(x)
  63
  64 #undef  coff_rtype_to_howto
  65 #define coff_rtype_to_howto     coff_tic4x_rtype_to_howto
  66
  67 #ifndef bfd_pe_print_pdata
  68 #define bfd_pe_print_pdata      NULL
  69 #endif
  70
  71 #include "coffcode.h"
  72
  73 static bfd_reloc_status_type
  74 tic4x_relocation (bfd *abfd ATTRIBUTE_UNUSED,
  75                   arelent *reloc_entry,
  76                   asymbol *symbol ATTRIBUTE_UNUSED,
  77                   void * data ATTRIBUTE_UNUSED,
  78                   asection *input_section,
  79                   bfd *output_bfd,
  80                   char **error_message ATTRIBUTE_UNUSED)
  81 {
  82   if (output_bfd != (bfd *) NULL)
  83     {
  84       /* This is a partial relocation, and we want to apply the
  85          relocation to the reloc entry rather than the raw data.
  86          Modify the reloc inplace to reflect what we now know.  */
  87       reloc_entry->address += input_section->output_offset;
  88       return bfd_reloc_ok;
  89     }
  90   return bfd_reloc_continue;
  91 }
  92
  93 reloc_howto_type tic4x_howto_table[] =
  94 {
  95     HOWTO(R_RELWORD,     0,  2, 16, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "RELWORD",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  96     HOWTO(R_REL24,       0,  2, 24, FALSE, 0, complain_overflow_bitfield, tic4x_relocation, "REL24",     TRUE, 0x00ffffff, 0x00ffffff, FALSE),
  97     HOWTO(R_RELLONG,     0,  2, 32, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "RELLONG",   TRUE, 0xffffffff, 0xffffffff, FALSE),
  98     HOWTO(R_PCRWORD,     0,  2, 16, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "PCRWORD",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  99     HOWTO(R_PCR24,       0,  2, 24, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "PCR24",     TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 100     HOWTO(R_PARTLS16,    0,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "PARTLS16",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 101     HOWTO(R_PARTMS8,    16,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "PARTMS8",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 102     HOWTO(R_RELWORD,     0,  2, 16, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "ARELWORD",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 103     HOWTO(R_REL24,       0,  2, 24, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "AREL24",    TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 104     HOWTO(R_RELLONG,     0,  2, 32, FALSE, 0, complain_overflow_signed,   tic4x_relocation, "ARELLONG",  TRUE, 0xffffffff, 0xffffffff, FALSE),
 105     HOWTO(R_PCRWORD,     0,  2, 16, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "APCRWORD",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 106     HOWTO(R_PCR24,       0,  2, 24, TRUE,  0, complain_overflow_signed,   tic4x_relocation, "APCR24",    TRUE, 0x00ffffff, 0x00ffffff, FALSE),
 107     HOWTO(R_PARTLS16,    0,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "APARTLS16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 108     HOWTO(R_PARTMS8,    16,  2, 16, FALSE, 0, complain_overflow_dont,     tic4x_relocation, "APARTMS8",  TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 109 };
 110 #define HOWTO_SIZE (sizeof(tic4x_howto_table) / sizeof(tic4x_howto_table[0]))
 111
 112 #undef coff_bfd_reloc_type_lookup
 113 #define coff_bfd_reloc_type_lookup tic4x_coff_reloc_type_lookup
 114 #undef coff_bfd_reloc_name_lookup
 115 #define coff_bfd_reloc_name_lookup tic4x_coff_reloc_name_lookup
 116
 117 /* For the case statement use the code values used tc_gen_reloc (defined in
 118    bfd/reloc.c) to map to the howto table entries.  */
 119
 120 static reloc_howto_type *
 121 tic4x_coff_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 122                               bfd_reloc_code_real_type code)
 123 {
 124   unsigned int type;
 125   unsigned int i;
 126
 127   switch (code)
 128     {
 129     case BFD_RELOC_32:          type = R_RELLONG; break;
 130     case BFD_RELOC_24:          type = R_REL24; break;
 131     case BFD_RELOC_16:          type = R_RELWORD; break;
 132     case BFD_RELOC_24_PCREL:    type = R_PCR24; break;
 133     case BFD_RELOC_16_PCREL:    type = R_PCRWORD; break;
 134     case BFD_RELOC_HI16:        type = R_PARTMS8; break;
 135     case BFD_RELOC_LO16:        type = R_PARTLS16; break;
 136     default:
 137       return NULL;
 138     }
 139
 140   for (i = 0; i < HOWTO_SIZE; i++)
 141     {
 142       if (tic4x_howto_table[i].type == type)
 143         return tic4x_howto_table + i;
 144     }
 145   return NULL;
 146 }
 147
 148 static reloc_howto_type *
 149 tic4x_coff_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 150                               const char *r_name)
 151 {
 152   unsigned int i;
 153
 154   for (i = 0;
 155        i < sizeof (tic4x_howto_table) / sizeof (tic4x_howto_table[0]);
 156        i++)
 157     if (tic4x_howto_table[i].name != NULL
 158         && strcasecmp (tic4x_howto_table[i].name, r_name) == 0)
 159       return &tic4x_howto_table[i];
 160
 161   return NULL;
 162 }
 163
 164 /* Code to turn a r_type into a howto ptr, uses the above howto table.
 165    Called after some initial checking by the tic4x_rtype_to_howto fn
 166    below.  */
 167 static void
 168 tic4x_lookup_howto (bfd *abfd,
 169                     arelent *internal,
 170                     struct internal_reloc *dst)
 171 {
 172   unsigned int i;
 173   int bank = (dst->r_symndx == -1) ? HOWTO_BANK : 0;
 174
 175   for (i = 0; i < HOWTO_SIZE; i++)
 176     {
 177       if (tic4x_howto_table[i].type == dst->r_type)
 178         {
 179           internal->howto = tic4x_howto_table + i + bank;
 180           return;
 181         }
 182     }
 183
 184   _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 185                       abfd, (unsigned int) dst->r_type);
 186   abort();
 187 }
 188
 189 static reloc_howto_type *
 190 coff_tic4x_rtype_to_howto (bfd *abfd,
 191                            asection *sec,
 192                            struct internal_reloc *rel,
 193                            struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
 194                            struct internal_syment *sym ATTRIBUTE_UNUSED,
 195                            bfd_vma *addendp)
 196 {
 197   arelent genrel;
 198
 199   if (rel->r_symndx == -1 && addendp != NULL)
 200     /* This is a TI "internal relocation", which means that the relocation
 201        amount is the amount by which the current section is being relocated
 202        in the output section.  */
 203     *addendp = (sec->output_section->vma + sec->output_offset) - sec->vma;
 204
 205   tic4x_lookup_howto (abfd, &genrel, rel);
 206
 207   return genrel.howto;
 208 }
 209
 210
 211 static void
 212 tic4x_reloc_processing (arelent *relent,
 213                         struct internal_reloc *reloc,
 214                         asymbol **symbols,
 215                         bfd *abfd,
 216                         asection *section)
 217 {
 218   asymbol *ptr;
 219
 220   relent->address = reloc->r_vaddr;
 221
 222   if (reloc->r_symndx != -1)
 223     {
 224       if (reloc->r_symndx < 0 || reloc->r_symndx >= obj_conv_table_size (abfd))
 225         {
 226           _bfd_error_handler
 227             /* xgettext: c-format */
 228             (_("%pB: warning: illegal symbol index %ld in relocs"),
 229              abfd, reloc->r_symndx);
 230           relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 231           ptr = NULL;
 232         }
 233       else
 234         {
 235           relent->sym_ptr_ptr = (symbols
 236                                  + obj_convert (abfd)[reloc->r_symndx]);
 237           ptr = *(relent->sym_ptr_ptr);
 238         }
 239     }
 240   else
 241     {
 242       relent->sym_ptr_ptr = section->symbol_ptr_ptr;
 243       ptr = *(relent->sym_ptr_ptr);
 244     }
 245
 246   /* The symbols definitions that we have read in have been relocated
 247      as if their sections started at 0.  But the offsets refering to
 248      the symbols in the raw data have not been modified, so we have to
 249      have a negative addend to compensate.
 250
 251      Note that symbols which used to be common must be left alone.  */
 252
 253   /* Calculate any reloc addend by looking at the symbol.  */
 254   CALC_ADDEND (abfd, ptr, *reloc, relent);
 255
 256   relent->address -= section->vma;
 257   /* !!     relent->section = (asection *) NULL;  */
 258
 259   /* Fill in the relent->howto field from reloc->r_type.  */
 260   tic4x_lookup_howto (abfd, relent, reloc);
 261 }
 262
 263
 264 /* TI COFF v0, DOS tools (little-endian headers).  */
 265 CREATE_LITTLE_COFF_TARGET_VEC(tic4x_coff0_vec, "coff0-tic4x",
 266                               0, SEC_CODE | SEC_READONLY, '_',
 267                               NULL, &ticoff0_swap_table);
 268
 269 /* TI COFF v0, SPARC tools (big-endian headers).  */
 270 CREATE_BIGHDR_COFF_TARGET_VEC(tic4x_coff0_beh_vec, "coff0-beh-tic4x",
 271                               0, SEC_CODE | SEC_READONLY, '_',
 272                               &tic4x_coff0_vec, &ticoff0_swap_table);
 273
 274 /* TI COFF v1, DOS tools (little-endian headers).  */
 275 CREATE_LITTLE_COFF_TARGET_VEC(tic4x_coff1_vec, "coff1-tic4x",
 276                               0, SEC_CODE | SEC_READONLY, '_',
 277                               &tic4x_coff0_beh_vec, &ticoff1_swap_table);
 278
 279 /* TI COFF v1, SPARC tools (big-endian headers).  */
 280 CREATE_BIGHDR_COFF_TARGET_VEC(tic4x_coff1_beh_vec, "coff1-beh-tic4x",
 281                               0, SEC_CODE | SEC_READONLY, '_',
 282                               &tic4x_coff1_vec, &ticoff1_swap_table);
 283
 284 /* TI COFF v2, TI DOS tools output (little-endian headers).  */
 285 CREATE_LITTLE_COFF_TARGET_VEC(tic4x_coff2_vec, "coff2-tic4x",
 286                               0, SEC_CODE | SEC_READONLY, '_',
 287                               &tic4x_coff1_beh_vec, COFF_SWAP_TABLE);
 288
 289 /* TI COFF v2, TI SPARC tools output (big-endian headers).  */
 290 CREATE_BIGHDR_COFF_TARGET_VEC(tic4x_coff2_beh_vec, "coff2-beh-tic4x",
 291                               0, SEC_CODE | SEC_READONLY, '_',
 292                               &tic4x_coff2_vec, COFF_SWAP_TABLE);