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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [bfd/] [elf32-iq2000.c] - Blame information for rev 853

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1 227 jeremybenn 
/* IQ2000-specific support for 32-bit ELF.
2 
   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
3 
   Free Software Foundation, Inc.
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, MA 02110-1301, USA.  */
20 
 
21 
#include "sysdep.h"
22 
#include "bfd.h"
23 
#include "libbfd.h"
24 
#include "elf-bfd.h"
25 
#include "elf/iq2000.h"
26 
 
27 
/* Forward declarations.  */
28 
 
29 
static bfd_reloc_status_type iq2000_elf_howto_hi16_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
30 
 
31 
 
32 
static reloc_howto_type iq2000_elf_howto_table [] =
33 
{
34 
  /* This reloc does nothing.  */
35 
 
36 
  HOWTO (R_IQ2000_NONE,              /* type */
37 
         0,                           /* rightshift */
38 
         2,                          /* size (0 = byte, 1 = short, 2 = long) */
39 
         32,                         /* bitsize */
40 
         FALSE,                      /* pc_relative */
41 
         0,                           /* bitpos */
42 
         complain_overflow_bitfield, /* complain_on_overflow */
43 
         bfd_elf_generic_reloc,      /* special_function */
44 
         "R_IQ2000_NONE",            /* name */
45 
         FALSE,                      /* partial_inplace */
46 
         0,                           /* src_mask */
47 
         0,                           /* dst_mask */
48 
         FALSE),                     /* pcrel_offset */
49 
 
50 
  /* A 16 bit absolute relocation.  */
51 
  HOWTO (R_IQ2000_16,                /* type */
52 
         0,                           /* rightshift */
53 
         1,                          /* size (0 = byte, 1 = short, 2 = long) */
54 
         16,                         /* bitsize */
55 
         FALSE,                      /* pc_relative */
56 
         0,                           /* bitpos */
57 
         complain_overflow_bitfield, /* complain_on_overflow */
58 
         bfd_elf_generic_reloc,      /* special_function */
59 
         "R_IQ2000_16",              /* name */
60 
         FALSE,                      /* partial_inplace */
61 
         0x0000,                     /* src_mask */
62 
         0xffff,                     /* dst_mask */
63 
         FALSE),                     /* pcrel_offset */
64 
 
65 
  /* A 32 bit absolute relocation.  */
66 
  HOWTO (R_IQ2000_32,                /* type */
67 
         0,                           /* rightshift */
68 
         2,                          /* size (0 = byte, 1 = short, 2 = long) */
69 
         31,                         /* bitsize */
70 
         FALSE,                      /* pc_relative */
71 
         0,                           /* bitpos */
72 
         complain_overflow_bitfield, /* complain_on_overflow */
73 
         bfd_elf_generic_reloc,      /* special_function */
74 
         "R_IQ2000_32",              /* name */
75 
         FALSE,                      /* partial_inplace */
76 
         0x00000000,                 /* src_mask */
77 
         0x7fffffff,                 /* dst_mask */
78 
         FALSE),                     /* pcrel_offset */
79 
 
80 
  /* 26 bit branch address.  */
81 
  HOWTO (R_IQ2000_26,           /* type */
82 
         2,                     /* rightshift */
83 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
84 
         26,                    /* bitsize */
85 
         FALSE,                 /* pc_relative */
86 
         0,                      /* bitpos */
87 
         complain_overflow_dont, /* complain_on_overflow */
88 
                                /* This needs complex overflow
89 
                                   detection, because the upper four
90 
                                   bits must match the PC.  */
91 
         bfd_elf_generic_reloc, /* special_function */
92 
         "R_IQ2000_26",         /* name */
93 
         FALSE,                 /* partial_inplace */
94 
         0x00000000,            /* src_mask */
95 
         0x03ffffff,            /* dst_mask */
96 
         FALSE),                /* pcrel_offset */
97 
 
98 
  /* 16 bit PC relative reference.  */
99 
  HOWTO (R_IQ2000_PC16,         /* type */
100 
         2,                     /* rightshift */
101 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
102 
         16,                    /* bitsize */
103 
         TRUE,                  /* pc_relative */
104 
         0,                      /* bitpos */
105 
         complain_overflow_signed, /* complain_on_overflow */
106 
         bfd_elf_generic_reloc, /* special_function */
107 
         "R_IQ2000_PC16",       /* name */
108 
         FALSE,                 /* partial_inplace */
109 
         0x0000,                /* src_mask */
110 
         0xffff,                /* dst_mask */
111 
         TRUE),                 /* pcrel_offset */
112 
 
113 
  /* high 16 bits of symbol value.  */
114 
  HOWTO (R_IQ2000_HI16,         /* type */
115 
         16,                    /* rightshift */
116 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
117 
         15,                    /* bitsize */
118 
         FALSE,                 /* pc_relative */
119 
         0,                      /* bitpos */
120 
         complain_overflow_dont, /* complain_on_overflow */
121 
         iq2000_elf_howto_hi16_reloc,   /* special_function */
122 
         "R_IQ2000_HI16",       /* name */
123 
         FALSE,                 /* partial_inplace */
124 
         0x0000,                /* src_mask */
125 
         0x7fff,                /* dst_mask */
126 
         FALSE),                /* pcrel_offset */
127 
 
128 
  /* Low 16 bits of symbol value.  */
129 
  HOWTO (R_IQ2000_LO16,         /* type */
130 
         0,                      /* rightshift */
131 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
132 
         16,                    /* bitsize */
133 
         FALSE,                 /* pc_relative */
134 
         0,                      /* bitpos */
135 
         complain_overflow_dont, /* complain_on_overflow */
136 
         bfd_elf_generic_reloc, /* special_function */
137 
         "R_IQ2000_LO16",       /* name */
138 
         FALSE,                 /* partial_inplace */
139 
         0x0000,                /* src_mask */
140 
         0xffff,                /* dst_mask */
141 
         FALSE),                /* pcrel_offset */
142 
 
143 
  /* 16-bit jump offset.  */
144 
  HOWTO (R_IQ2000_OFFSET_16,    /* type */
145 
         2,                     /* rightshift */
146 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
147 
         16,                    /* bitsize */
148 
         FALSE,                 /* pc_relative */
149 
         0,                      /* bitpos */
150 
         complain_overflow_dont, /* complain_on_overflow */
151 
         bfd_elf_generic_reloc, /* special_function */
152 
         "R_IQ2000_OFFSET_16",  /* name */
153 
         FALSE,                 /* partial_inplace */
154 
         0x0000,                /* src_mask */
155 
         0xffff,                /* dst_mask */
156 
         FALSE),                /* pcrel_offset */
157 
 
158 
  /* 21-bit jump offset.  */
159 
  HOWTO (R_IQ2000_OFFSET_21,    /* type */
160 
         2,                     /* rightshift */
161 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
162 
         21,                    /* bitsize */
163 
         FALSE,                 /* pc_relative */
164 
         0,                      /* bitpos */
165 
         complain_overflow_dont, /* complain_on_overflow */
166 
         bfd_elf_generic_reloc, /* special_function */
167 
         "R_IQ2000_OFFSET_21",  /* name */
168 
         FALSE,                 /* partial_inplace */
169 
         0x000000,              /* src_mask */
170 
         0x1fffff,              /* dst_mask */
171 
         FALSE),                /* pcrel_offset */
172 
 
173 
  /* unsigned high 16 bits of value.  */
174 
  HOWTO (R_IQ2000_OFFSET_21,    /* type */
175 
         16,                    /* rightshift */
176 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
177 
         16,                    /* bitsize */
178 
         FALSE,                 /* pc_relative */
179 
         0,                      /* bitpos */
180 
         complain_overflow_dont, /* complain_on_overflow */
181 
         bfd_elf_generic_reloc, /* special_function */
182 
         "R_IQ2000_UHI16",      /* name */
183 
         FALSE,                 /* partial_inplace */
184 
         0x0000,                /* src_mask */
185 
         0x7fff,                /* dst_mask */
186 
         FALSE),                /* pcrel_offset */
187 
 
188 
  /* A 32 bit absolute debug relocation.  */
189 
  HOWTO (R_IQ2000_32_DEBUG,          /* type */
190 
         0,                           /* rightshift */
191 
         2,                          /* size (0 = byte, 1 = short, 2 = long) */
192 
         32,                         /* bitsize */
193 
         FALSE,                      /* pc_relative */
194 
         0,                           /* bitpos */
195 
         complain_overflow_bitfield, /* complain_on_overflow */
196 
         bfd_elf_generic_reloc,      /* special_function */
197 
         "R_IQ2000_32",              /* name */
198 
         FALSE,                      /* partial_inplace */
199 
         0x00000000,                 /* src_mask */
200 
         0xffffffff,                 /* dst_mask */
201 
         FALSE),                     /* pcrel_offset */
202 
 
203 
};
204 
 
205 
/* GNU extension to record C++ vtable hierarchy.  */
206 
static reloc_howto_type iq2000_elf_vtinherit_howto =
207 
  HOWTO (R_IQ2000_GNU_VTINHERIT,    /* type */
208 
         0,                         /* rightshift */
209 
         2,                        /* size (0 = byte, 1 = short, 2 = long) */
210 
         0,                         /* bitsize */
211 
         FALSE,                    /* pc_relative */
212 
         0,                         /* bitpos */
213 
         complain_overflow_dont,   /* complain_on_overflow */
214 
         NULL,                     /* special_function */
215 
         "R_IQ2000_GNU_VTINHERIT",  /* name */
216 
         FALSE,                    /* partial_inplace */
217 
         0,                         /* src_mask */
218 
         0,                         /* dst_mask */
219 
         FALSE);                   /* pcrel_offset */
220 
 
221 
/* GNU extension to record C++ vtable member usage.  */
222 
static reloc_howto_type iq2000_elf_vtentry_howto =
223 
  HOWTO (R_IQ2000_GNU_VTENTRY,     /* type */
224 
         0,                         /* rightshift */
225 
         2,                        /* size (0 = byte, 1 = short, 2 = long) */
226 
         0,                         /* bitsize */
227 
         FALSE,                    /* pc_relative */
228 
         0,                         /* bitpos */
229 
         complain_overflow_dont,   /* complain_on_overflow */
230 
         NULL,                     /* special_function */
231 
         "R_IQ2000_GNU_VTENTRY",    /* name */
232 
         FALSE,                    /* partial_inplace */
233 
         0,                         /* src_mask */
234 
         0,                         /* dst_mask */
235 
         FALSE);                   /* pcrel_offset */
236 
 
237 
 
238 
static bfd_reloc_status_type
239 
iq2000_elf_howto_hi16_reloc (bfd *abfd ATTRIBUTE_UNUSED,
240 
                             arelent *reloc_entry,
241 
                             asymbol *symbol,
242 
                             void * data,
243 
                             asection *input_section,
244 
                             bfd *output_bfd,
245 
                             char **error_message ATTRIBUTE_UNUSED)
246 
{
247 
  bfd_reloc_status_type ret;
248 
  bfd_vma relocation;
249 
 
250 
  /* If we're relocating and this an external symbol,
251 
     we don't want to change anything.  */
252 
  if (output_bfd != (bfd *) NULL
253 
      && (symbol->flags & BSF_SECTION_SYM) == 0
254 
      && reloc_entry->addend == 0)
255 
    {
256 
      reloc_entry->address += input_section->output_offset;
257 
      return bfd_reloc_ok;
258 
    }
259 
 
260 
  if (bfd_is_com_section (symbol->section))
261 
    relocation = 0;
262 
  else
263 
    relocation = symbol->value;
264 
 
265 
  relocation += symbol->section->output_section->vma;
266 
  relocation += symbol->section->output_offset;
267 
  relocation += reloc_entry->addend;
268 
 
269 
  /* If %lo will have sign-extension, compensate by add 0x10000 to hi portion.  */
270 
  if (relocation & 0x8000)
271 
    reloc_entry->addend += 0x10000;
272 
 
273 
  /* Now do the reloc in the usual way.  */
274 
  ret = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
275 
                                input_section, output_bfd, error_message);
276 
 
277 
  /* Put it back the way it was.  */
278 
  if (relocation & 0x8000)
279 
    reloc_entry->addend -= 0x10000;
280 
 
281 
  return ret;
282 
}
283 
 
284 
static bfd_reloc_status_type
285 
iq2000_elf_relocate_hi16 (bfd *input_bfd,
286 
                          Elf_Internal_Rela *relhi,
287 
                          bfd_byte *contents,
288 
                          bfd_vma value)
289 
{
290 
  bfd_vma insn;
291 
 
292 
  insn = bfd_get_32 (input_bfd, contents + relhi->r_offset);
293 
 
294 
  value += relhi->r_addend;
295 
  value &= 0x7fffffff; /* Mask off top-bit which is Harvard mask bit.  */
296 
 
297 
  /* If top-bit of %lo value is on, this means that %lo will
298 
     sign-propagate and so we compensate by adding 1 to %hi value.  */
299 
  if (value & 0x8000)
300 
    value += 0x10000;
301 
 
302 
  value >>= 16;
303 
  insn = ((insn & ~0xFFFF) | value);
304 
 
305 
  bfd_put_32 (input_bfd, insn, contents + relhi->r_offset);
306 
  return bfd_reloc_ok;
307 
}
308 
 
309 
static bfd_reloc_status_type
310 
iq2000_elf_relocate_offset16 (bfd *input_bfd,
311 
                              Elf_Internal_Rela *rel,
312 
                              bfd_byte *contents,
313 
                              bfd_vma value,
314 
                              bfd_vma location)
315 
{
316 
  bfd_vma insn;
317 
  bfd_vma jtarget;
318 
 
319 
  insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
320 
 
321 
  value += rel->r_addend;
322 
 
323 
  if (value & 3)
324 
    return bfd_reloc_dangerous;
325 
 
326 
  jtarget = (value & 0x3fffc) | (location & 0xf0000000L);
327 
 
328 
  if (jtarget != value)
329 
    return bfd_reloc_overflow;
330 
 
331 
  insn = (insn & ~0xFFFF) | ((value >> 2) & 0xFFFF);
332 
 
333 
  bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
334 
  return bfd_reloc_ok;
335 
}
336 
 
337 
/* Map BFD reloc types to IQ2000 ELF reloc types.  */
338 
 
339 
static reloc_howto_type *
340 
iq2000_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
341 
                          bfd_reloc_code_real_type code)
342 
{
343 
  /* Note that the iq2000_elf_howto_table is indxed by the R_
344 
     constants.  Thus, the order that the howto records appear in the
345 
     table *must* match the order of the relocation types defined in
346 
     include/elf/iq2000.h.  */
347 
 
348 
  switch (code)
349 
    {
350 
    case BFD_RELOC_NONE:
351 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_NONE];
352 
    case BFD_RELOC_16:
353 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_16];
354 
    case BFD_RELOC_32:
355 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_32];
356 
    case BFD_RELOC_MIPS_JMP:
357 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_26];
358 
    case BFD_RELOC_IQ2000_OFFSET_16:
359 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_16];
360 
    case BFD_RELOC_IQ2000_OFFSET_21:
361 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_OFFSET_21];
362 
    case BFD_RELOC_16_PCREL_S2:
363 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_PC16];
364 
    case BFD_RELOC_HI16:
365 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_HI16];
366 
    case BFD_RELOC_IQ2000_UHI16:
367 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_UHI16];
368 
    case BFD_RELOC_LO16:
369 
      return &iq2000_elf_howto_table[ (int) R_IQ2000_LO16];
370 
    case BFD_RELOC_VTABLE_INHERIT:
371 
      return &iq2000_elf_vtinherit_howto;
372 
    case BFD_RELOC_VTABLE_ENTRY:
373 
      return &iq2000_elf_vtentry_howto;
374 
    default:
375 
      /* Pacify gcc -Wall.  */
376 
      return NULL;
377 
    }
378 
  return NULL;
379 
}
380 
 
381 
static reloc_howto_type *
382 
iq2000_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
383 
{
384 
  unsigned int i;
385 
 
386 
  for (i = 0;
387 
       i < (sizeof (iq2000_elf_howto_table)
388 
            / sizeof (iq2000_elf_howto_table[0]));
389 
       i++)
390 
    if (iq2000_elf_howto_table[i].name != NULL
391 
        && strcasecmp (iq2000_elf_howto_table[i].name, r_name) == 0)
392 
      return &iq2000_elf_howto_table[i];
393 
 
394 
  if (strcasecmp (iq2000_elf_vtinherit_howto.name, r_name) == 0)
395 
    return &iq2000_elf_vtinherit_howto;
396 
  if (strcasecmp (iq2000_elf_vtentry_howto.name, r_name) == 0)
397 
    return &iq2000_elf_vtentry_howto;
398 
 
399 
  return NULL;
400 
}
401 
 
402 
/* Perform a single relocation.  By default we use the standard BFD
403 
   routines.  */
404 
 
405 
static bfd_reloc_status_type
406 
iq2000_final_link_relocate (reloc_howto_type *  howto,
407 
                            bfd *               input_bfd,
408 
                            asection *          input_section,
409 
                            bfd_byte *          contents,
410 
                            Elf_Internal_Rela * rel,
411 
                            bfd_vma             relocation)
412 
{
413 
  return _bfd_final_link_relocate (howto, input_bfd, input_section,
414 
                                   contents, rel->r_offset,
415 
                                   relocation, rel->r_addend);
416 
}
417 
 
418 
/* Set the howto pointer for a IQ2000 ELF reloc.  */
419 
 
420 
static void
421 
iq2000_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
422 
                           arelent * cache_ptr,
423 
                           Elf_Internal_Rela * dst)
424 
{
425 
  unsigned int r_type;
426 
 
427 
  r_type = ELF32_R_TYPE (dst->r_info);
428 
  switch (r_type)
429 
    {
430 
    case R_IQ2000_GNU_VTINHERIT:
431 
      cache_ptr->howto = & iq2000_elf_vtinherit_howto;
432 
      break;
433 
 
434 
    case R_IQ2000_GNU_VTENTRY:
435 
      cache_ptr->howto = & iq2000_elf_vtentry_howto;
436 
      break;
437 
 
438 
    default:
439 
      cache_ptr->howto = & iq2000_elf_howto_table [r_type];
440 
      break;
441 
    }
442 
}
443 
 
444 
/* Look through the relocs for a section during the first phase.
445 
   Since we don't do .gots or .plts, we just need to consider the
446 
   virtual table relocs for gc.  */
447 
 
448 
static bfd_boolean
449 
iq2000_elf_check_relocs (bfd *abfd,
450 
                         struct bfd_link_info *info,
451 
                         asection *sec,
452 
                         const Elf_Internal_Rela *relocs)
453 
{
454 
  Elf_Internal_Shdr *symtab_hdr;
455 
  struct elf_link_hash_entry **sym_hashes;
456 
  const Elf_Internal_Rela *rel;
457 
  const Elf_Internal_Rela *rel_end;
458 
  bfd_boolean changed = FALSE;
459 
 
460 
  if (info->relocatable)
461 
    return TRUE;
462 
 
463 
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
464 
  sym_hashes = elf_sym_hashes (abfd);
465 
 
466 
  rel_end = relocs + sec->reloc_count;
467 
  for (rel = relocs; rel < rel_end; rel++)
468 
    {
469 
      struct elf_link_hash_entry *h;
470 
      unsigned long r_symndx;
471 
 
472 
      r_symndx = ELF32_R_SYM (rel->r_info);
473 
      if (r_symndx < symtab_hdr->sh_info)
474 
        h = NULL;
475 
      else
476 
        {
477 
          h = sym_hashes[r_symndx - symtab_hdr->sh_info];
478 
          while (h->root.type == bfd_link_hash_indirect
479 
                 || h->root.type == bfd_link_hash_warning)
480 
            h = (struct elf_link_hash_entry *) h->root.u.i.link;
481 
        }
482 
 
483 
      switch (ELF32_R_TYPE (rel->r_info))
484 
        {
485 
          /* This relocation describes the C++ object vtable
486 
             hierarchy.  Reconstruct it for later use during GC.  */
487 
        case R_IQ2000_GNU_VTINHERIT:
488 
          if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
489 
            return FALSE;
490 
          break;
491 
 
492 
          /* This relocation describes which C++ vtable entries
493 
             are actually used.  Record for later use during GC.  */
494 
        case R_IQ2000_GNU_VTENTRY:
495 
          BFD_ASSERT (h != NULL);
496 
          if (h != NULL
497 
              && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
498 
            return FALSE;
499 
          break;
500 
 
501 
        case R_IQ2000_32:
502 
          /* For debug section, change to special harvard-aware relocations.  */
503 
          if (CONST_STRNEQ (sec->name, ".debug")
504 
              || CONST_STRNEQ (sec->name, ".stab")
505 
              || CONST_STRNEQ (sec->name, ".eh_frame"))
506 
            {
507 
              ((Elf_Internal_Rela *) rel)->r_info
508 
                = ELF32_R_INFO (ELF32_R_SYM (rel->r_info), R_IQ2000_32_DEBUG);
509 
              changed = TRUE;
510 
            }
511 
          break;
512 
        }
513 
    }
514 
 
515 
  if (changed)
516 
    /* Note that we've changed relocs, otherwise if !info->keep_memory
517 
       we'll free the relocs and lose our changes.  */
518 
    elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
519 
 
520 
  return TRUE;
521 
}
522 
 
523 
 
524 
/* Relocate a IQ2000 ELF section.
525 
   There is some attempt to make this function usable for many architectures,
526 
   both USE_REL and USE_RELA ['twould be nice if such a critter existed],
527 
   if only to serve as a learning tool.
528 
 
529 
   The RELOCATE_SECTION function is called by the new ELF backend linker
530 
   to handle the relocations for a section.
531 
 
532 
   The relocs are always passed as Rela structures; if the section
533 
   actually uses Rel structures, the r_addend field will always be
534 
   zero.
535 
 
536 
   This function is responsible for adjusting the section contents as
537 
   necessary, and (if using Rela relocs and generating a relocatable
538 
   output file) adjusting the reloc addend as necessary.
539 
 
540 
   This function does not have to worry about setting the reloc
541 
   address or the reloc symbol index.
542 
 
543 
   LOCAL_SYMS is a pointer to the swapped in local symbols.
544 
 
545 
   LOCAL_SECTIONS is an array giving the section in the input file
546 
   corresponding to the st_shndx field of each local symbol.
547 
 
548 
   The global hash table entry for the global symbols can be found
549 
   via elf_sym_hashes (input_bfd).
550 
 
551 
   When generating relocatable output, this function must handle
552 
   STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
553 
   going to be the section symbol corresponding to the output
554 
   section, which means that the addend must be adjusted
555 
   accordingly.  */
556 
 
557 
static bfd_boolean
558 
iq2000_elf_relocate_section (bfd *                   output_bfd ATTRIBUTE_UNUSED,
559 
                             struct bfd_link_info *  info,
560 
                             bfd *                   input_bfd,
561 
                             asection *              input_section,
562 
                             bfd_byte *              contents,
563 
                             Elf_Internal_Rela *     relocs,
564 
                             Elf_Internal_Sym *      local_syms,
565 
                             asection **             local_sections)
566 
{
567 
  Elf_Internal_Shdr *           symtab_hdr;
568 
  struct elf_link_hash_entry ** sym_hashes;
569 
  Elf_Internal_Rela *           rel;
570 
  Elf_Internal_Rela *           relend;
571 
 
572 
  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
573 
  sym_hashes = elf_sym_hashes (input_bfd);
574 
  relend     = relocs + input_section->reloc_count;
575 
 
576 
  for (rel = relocs; rel < relend; rel ++)
577 
    {
578 
      reloc_howto_type *           howto;
579 
      unsigned long                r_symndx;
580 
      Elf_Internal_Sym *           sym;
581 
      asection *                   sec;
582 
      struct elf_link_hash_entry * h;
583 
      bfd_vma                      relocation;
584 
      bfd_reloc_status_type        r;
585 
      const char *                 name = NULL;
586 
      int                          r_type;
587 
 
588 
      r_type = ELF32_R_TYPE (rel->r_info);
589 
 
590 
      if (   r_type == R_IQ2000_GNU_VTINHERIT
591 
          || r_type == R_IQ2000_GNU_VTENTRY)
592 
        continue;
593 
 
594 
      r_symndx = ELF32_R_SYM (rel->r_info);
595 
 
596 
      howto  = iq2000_elf_howto_table + ELF32_R_TYPE (rel->r_info);
597 
      h      = NULL;
598 
      sym    = NULL;
599 
      sec    = NULL;
600 
 
601 
      if (r_symndx < symtab_hdr->sh_info)
602 
        {
603 
          asection *osec;
604 
 
605 
          sym = local_syms + r_symndx;
606 
          osec = sec = local_sections [r_symndx];
607 
          if ((sec->flags & SEC_MERGE)
608 
              && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
609 
            /* This relocation is relative to a section symbol that is
610 
               going to be merged.  Change it so that it is relative
611 
               to the merged section symbol.  */
612 
            rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym, &sec,
613 
                                                    rel->r_addend);
614 
 
615 
          relocation = (sec->output_section->vma
616 
                        + sec->output_offset
617 
                        + sym->st_value);
618 
 
619 
          name = bfd_elf_string_from_elf_section
620 
            (input_bfd, symtab_hdr->sh_link, sym->st_name);
621 
          name = (name == NULL) ? bfd_section_name (input_bfd, osec) : name;
622 
        }
623 
      else
624 
        {
625 
          bfd_boolean unresolved_reloc;
626 
          bfd_boolean warned;
627 
 
628 
          RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
629 
                                   r_symndx, symtab_hdr, sym_hashes,
630 
                                   h, sec, relocation,
631 
                                   unresolved_reloc, warned);
632 
 
633 
          name = h->root.root.string;
634 
        }
635 
 
636 
      if (sec != NULL && elf_discarded_section (sec))
637 
        {
638 
          /* For relocs against symbols from removed linkonce sections,
639 
             or sections discarded by a linker script, we just want the
640 
             section contents zeroed.  Avoid any special processing.  */
641 
          _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
642 
          rel->r_info = 0;
643 
          rel->r_addend = 0;
644 
          continue;
645 
        }
646 
 
647 
      if (info->relocatable)
648 
        continue;
649 
 
650 
      switch (r_type)
651 
        {
652 
        case R_IQ2000_HI16:
653 
          r = iq2000_elf_relocate_hi16 (input_bfd, rel, contents, relocation);
654 
          break;
655 
 
656 
        case R_IQ2000_OFFSET_16:
657 
          r = iq2000_elf_relocate_offset16 (input_bfd, rel, contents, relocation,
658 
                                            input_section->output_section->vma
659 
                                            + input_section->output_offset
660 
                                            + rel->r_offset);
661 
          break;
662 
 
663 
        case R_IQ2000_PC16:
664 
          rel->r_addend -= 4;
665 
          /* Fall through.  */
666 
 
667 
        default:
668 
          r = iq2000_final_link_relocate (howto, input_bfd, input_section,
669 
                                         contents, rel, relocation);
670 
          break;
671 
        }
672 
 
673 
      if (r != bfd_reloc_ok)
674 
        {
675 
          const char * msg = (const char *) NULL;
676 
 
677 
          switch (r)
678 
            {
679 
            case bfd_reloc_overflow:
680 
              r = info->callbacks->reloc_overflow
681 
                (info, (h ? &h->root : NULL), name, howto->name,
682 
                 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
683 
              break;
684 
 
685 
            case bfd_reloc_undefined:
686 
              r = info->callbacks->undefined_symbol
687 
                (info, name, input_bfd, input_section, rel->r_offset, TRUE);
688 
              break;
689 
 
690 
            case bfd_reloc_outofrange:
691 
              msg = _("internal error: out of range error");
692 
              break;
693 
 
694 
            case bfd_reloc_notsupported:
695 
              msg = _("internal error: unsupported relocation error");
696 
              break;
697 
 
698 
            case bfd_reloc_dangerous:
699 
              msg = _("internal error: dangerous relocation");
700 
              break;
701 
 
702 
            default:
703 
              msg = _("internal error: unknown error");
704 
              break;
705 
            }
706 
 
707 
          if (msg)
708 
            r = info->callbacks->warning
709 
              (info, msg, name, input_bfd, input_section, rel->r_offset);
710 
 
711 
          if (! r)
712 
            return FALSE;
713 
        }
714 
    }
715 
 
716 
  return TRUE;
717 
}
718 
 
719 
 
720 
/* Return the section that should be marked against GC for a given
721 
   relocation.  */
722 
 
723 
static asection *
724 
iq2000_elf_gc_mark_hook (asection *sec,
725 
                         struct bfd_link_info *info,
726 
                         Elf_Internal_Rela *rel,
727 
                         struct elf_link_hash_entry *h,
728 
                         Elf_Internal_Sym *sym)
729 
{
730 
  if (h != NULL)
731 
    switch (ELF32_R_TYPE (rel->r_info))
732 
      {
733 
      case R_IQ2000_GNU_VTINHERIT:
734 
      case R_IQ2000_GNU_VTENTRY:
735 
        return NULL;
736 
      }
737 
 
738 
  return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
739 
}
740 
 
741 
 
742 
/* Return the MACH for an e_flags value.  */
743 
 
744 
static int
745 
elf32_iq2000_machine (bfd *abfd)
746 
{
747 
  switch (elf_elfheader (abfd)->e_flags & EF_IQ2000_CPU_MASK)
748 
    {
749 
    case EF_IQ2000_CPU_IQ10:
750 
      return bfd_mach_iq10;
751 
 
752 
    case EF_IQ2000_CPU_IQ2000:
753 
    default:
754 
      return bfd_mach_iq2000;
755 
    }
756 
}
757 
 
758 
 
759 
/* Function to set the ELF flag bits.  */
760 
 
761 
static bfd_boolean
762 
iq2000_elf_set_private_flags (bfd *abfd, flagword flags)
763 
{
764 
  elf_elfheader (abfd)->e_flags = flags;
765 
  elf_flags_init (abfd) = TRUE;
766 
  return TRUE;
767 
}
768 
 
769 
/* Copy backend specific data from one object module to another.  */
770 
 
771 
static bfd_boolean
772 
iq2000_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
773 
{
774 
  if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
775 
      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
776 
    return TRUE;
777 
 
778 
  BFD_ASSERT (!elf_flags_init (obfd)
779 
              || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
780 
 
781 
  elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
782 
  elf_flags_init (obfd) = TRUE;
783 
 
784 
  /* Copy object attributes.  */
785 
  _bfd_elf_copy_obj_attributes (ibfd, obfd);
786 
 
787 
  return TRUE;
788 
}
789 
 
790 
/* Merge backend specific data from an object
791 
   file to the output object file when linking.  */
792 
 
793 
static bfd_boolean
794 
iq2000_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
795 
{
796 
  flagword old_flags, old_partial;
797 
  flagword new_flags, new_partial;
798 
  bfd_boolean error = FALSE;
799 
  char new_opt[80];
800 
  char old_opt[80];
801 
 
802 
  new_opt[0] = old_opt[0] = '\0';
803 
  new_flags = elf_elfheader (ibfd)->e_flags;
804 
  old_flags = elf_elfheader (obfd)->e_flags;
805 
 
806 
  if (!elf_flags_init (obfd))
807 
    {
808 
      /* First call, no flags set.  */
809 
      elf_flags_init (obfd) = TRUE;
810 
      elf_elfheader (obfd)->e_flags = new_flags;
811 
    }
812 
 
813 
  else if (new_flags != old_flags)
814 
    {
815 
      /* Warn if different cpu is used, but allow a
816 
         specific cpu to override the generic cpu.  */
817 
      new_partial = (new_flags & EF_IQ2000_CPU_MASK);
818 
      old_partial = (old_flags & EF_IQ2000_CPU_MASK);
819 
 
820 
      if (new_partial != old_partial)
821 
        {
822 
          switch (new_partial)
823 
            {
824 
            case EF_IQ2000_CPU_IQ10:
825 
              strcat (new_opt, " -m10");
826 
              break;
827 
 
828 
            default:
829 
            case EF_IQ2000_CPU_IQ2000:
830 
              strcat (new_opt, " -m2000");
831 
              break;
832 
            }
833 
 
834 
          switch (old_partial)
835 
            {
836 
            case EF_IQ2000_CPU_IQ10:
837 
              strcat (old_opt, " -m10");
838 
              break;
839 
 
840 
            default:
841 
            case EF_IQ2000_CPU_IQ2000:
842 
              strcat (old_opt, " -m2000");
843 
              break;
844 
            }
845 
        }
846 
 
847 
      /* Print out any mismatches from above.  */
848 
      if (new_opt[0])
849 
        {
850 
          error = TRUE;
851 
          _bfd_error_handler
852 
            (_("%s: compiled with %s and linked with modules compiled with %s"),
853 
             bfd_get_filename (ibfd), new_opt, old_opt);
854 
        }
855 
 
856 
      new_flags &= ~ EF_IQ2000_ALL_FLAGS;
857 
      old_flags &= ~ EF_IQ2000_ALL_FLAGS;
858 
 
859 
      /* Warn about any other mismatches.  */
860 
      if (new_flags != old_flags)
861 
        {
862 
          error = TRUE;
863 
 
864 
          _bfd_error_handler
865 
            (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
866 
             bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
867 
        }
868 
    }
869 
 
870 
  if (error)
871 
    bfd_set_error (bfd_error_bad_value);
872 
 
873 
  return !error;
874 
}
875 
 
876 
 
877 
static bfd_boolean
878 
iq2000_elf_print_private_bfd_data (bfd *abfd, void * ptr)
879 
{
880 
  FILE *file = (FILE *) ptr;
881 
  flagword flags;
882 
 
883 
  BFD_ASSERT (abfd != NULL && ptr != NULL);
884 
 
885 
  /* Print normal ELF private data.  */
886 
  _bfd_elf_print_private_bfd_data (abfd, ptr);
887 
 
888 
  flags = elf_elfheader (abfd)->e_flags;
889 
  fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
890 
 
891 
  switch (flags & EF_IQ2000_CPU_MASK)
892 
    {
893 
    case EF_IQ2000_CPU_IQ10:
894 
      fprintf (file, " -m10");
895 
      break;
896 
    case EF_IQ2000_CPU_IQ2000:
897 
      fprintf (file, " -m2000");
898 
      break;
899 
    default:
900 
      break;
901 
    }
902 
 
903 
  fputc ('\n', file);
904 
  return TRUE;
905 
}
906 
 
907 
static
908 
bfd_boolean
909 
iq2000_elf_object_p (bfd *abfd)
910 
{
911 
  bfd_default_set_arch_mach (abfd, bfd_arch_iq2000,
912 
                             elf32_iq2000_machine (abfd));
913 
  return TRUE;
914 
}
915 
 
916 
 
917 
#define ELF_ARCH                bfd_arch_iq2000
918 
#define ELF_MACHINE_CODE        EM_IQ2000
919 
#define ELF_MAXPAGESIZE         0x1000
920 
 
921 
#define TARGET_BIG_SYM          bfd_elf32_iq2000_vec
922 
#define TARGET_BIG_NAME         "elf32-iq2000"
923 
 
924 
#define elf_info_to_howto_rel                   NULL
925 
#define elf_info_to_howto                       iq2000_info_to_howto_rela
926 
#define elf_backend_relocate_section            iq2000_elf_relocate_section
927 
#define elf_backend_gc_mark_hook                iq2000_elf_gc_mark_hook
928 
#define elf_backend_check_relocs                iq2000_elf_check_relocs
929 
#define elf_backend_object_p                    iq2000_elf_object_p
930 
#define elf_backend_rela_normal                 1
931 
 
932 
#define elf_backend_can_gc_sections             1
933 
 
934 
#define bfd_elf32_bfd_reloc_type_lookup         iq2000_reloc_type_lookup
935 
#define bfd_elf32_bfd_reloc_name_lookup iq2000_reloc_name_lookup
936 
#define bfd_elf32_bfd_set_private_flags         iq2000_elf_set_private_flags
937 
#define bfd_elf32_bfd_copy_private_bfd_data     iq2000_elf_copy_private_bfd_data
938 
#define bfd_elf32_bfd_merge_private_bfd_data    iq2000_elf_merge_private_bfd_data
939 
#define bfd_elf32_bfd_print_private_bfd_data    iq2000_elf_print_private_bfd_data
940 
 
941 
#include "elf32-target.h"

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