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[/] [or1k/] [trunk/] [gdb-5.0/] [bfd/] [elf32-avr.c] - Blame information for rev 1765

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1 104 markom 
/* AVR-specific support for 32-bit ELF
2 
   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
3 
   Contributed by Denis Chertykov <denisc@overta.ru>
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
20 
 
21 
 
22 
#include "bfd.h"
23 
#include "sysdep.h"
24 
#include "libbfd.h"
25 
#include "elf-bfd.h"
26 
#include "elf/avr.h"
27 
 
28 
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
29 
  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
30 
static void avr_info_to_howto_rela
31 
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
32 
static asection *elf32_avr_gc_mark_hook
33 
  PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
34 
           struct elf_link_hash_entry *, Elf_Internal_Sym *));
35 
static boolean elf32_avr_gc_sweep_hook
36 
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
37 
           const Elf_Internal_Rela *));
38 
static boolean elf32_avr_check_relocs
39 
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
40 
           const Elf_Internal_Rela *));
41 
static bfd_reloc_status_type avr_final_link_relocate
42 
  PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
43 
           Elf_Internal_Rela *, bfd_vma));
44 
static boolean elf32_avr_relocate_section
45 
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
46 
           Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
47 
static void bfd_elf_avr_final_write_processing PARAMS ((bfd *, boolean));
48 
static boolean elf32_avr_object_p PARAMS ((bfd *));
49 
 
50 
 
51 
/* Use RELA instead of REL */
52 
#undef USE_REL
53 
 
54 
static reloc_howto_type elf_avr_howto_table[] =
55 
{
56 
  HOWTO (R_AVR_NONE,            /* type */
57 
         0,                      /* rightshift */
58 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
59 
         32,                    /* bitsize */
60 
         false,                 /* pc_relative */
61 
         0,                      /* bitpos */
62 
         complain_overflow_bitfield, /* complain_on_overflow */
63 
         bfd_elf_generic_reloc, /* special_function */
64 
         "R_AVR_NONE",          /* name */
65 
         false,                 /* partial_inplace */
66 
         0,                      /* src_mask */
67 
         0,                      /* dst_mask */
68 
         false),                /* pcrel_offset */
69 
 
70 
  HOWTO (R_AVR_32,              /* type */
71 
         0,                      /* rightshift */
72 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
73 
         32,                    /* bitsize */
74 
         false,                 /* pc_relative */
75 
         0,                      /* bitpos */
76 
         complain_overflow_bitfield, /* complain_on_overflow */
77 
         bfd_elf_generic_reloc, /* special_function */
78 
         "R_AVR_32",            /* name */
79 
         false,                 /* partial_inplace */
80 
         0xffffffff,            /* src_mask */
81 
         0xffffffff,            /* dst_mask */
82 
         false),                /* pcrel_offset */
83 
 
84 
  /* A 7 bit PC relative relocation.  */
85 
  HOWTO (R_AVR_7_PCREL,         /* type */
86 
         1,                     /* rightshift */
87 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
88 
         7,                     /* bitsize */
89 
         true,                  /* pc_relative */
90 
         3,                     /* bitpos */
91 
         complain_overflow_bitfield, /* complain_on_overflow */
92 
         bfd_elf_generic_reloc, /* special_function */
93 
         "R_AVR_7_PCREL",       /* name */
94 
         false,                 /* partial_inplace */
95 
         0xffff,                /* src_mask */
96 
         0xffff,                /* dst_mask */
97 
         true),                 /* pcrel_offset */
98 
 
99 
  /* A 13 bit PC relative relocation.  */
100 
  HOWTO (R_AVR_13_PCREL,        /* type */
101 
         1,                     /* rightshift */
102 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
103 
         13,                    /* bitsize */
104 
         true,                  /* pc_relative */
105 
         0,                      /* bitpos */
106 
         complain_overflow_bitfield, /* complain_on_overflow */
107 
         bfd_elf_generic_reloc, /* special_function */
108 
         "R_AVR_13_PCREL",      /* name */
109 
         false,                 /* partial_inplace */
110 
         0xfff,                 /* src_mask */
111 
         0xfff,                 /* dst_mask */
112 
         true),                 /* pcrel_offset */
113 
 
114 
  /* A 16 bit absolute relocation.  */
115 
  HOWTO (R_AVR_16,              /* type */
116 
         0,                      /* rightshift */
117 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
118 
         16,                    /* bitsize */
119 
         false,                 /* pc_relative */
120 
         0,                      /* bitpos */
121 
         complain_overflow_dont, /* complain_on_overflow */
122 
         bfd_elf_generic_reloc, /* special_function */
123 
         "R_AVR_16",            /* name */
124 
         false,                 /* partial_inplace */
125 
         0xffff,                /* src_mask */
126 
         0xffff,                /* dst_mask */
127 
         false),                /* pcrel_offset */
128 
 
129 
  /* A 16 bit absolute relocation for command address.  */
130 
  HOWTO (R_AVR_16_PM,           /* type */
131 
         1,                     /* rightshift */
132 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
133 
         16,                    /* bitsize */
134 
         false,                 /* pc_relative */
135 
         0,                      /* bitpos */
136 
         complain_overflow_bitfield, /* complain_on_overflow */
137 
         bfd_elf_generic_reloc, /* special_function */
138 
         "R_AVR_16_PM",         /* name */
139 
         false,                 /* partial_inplace */
140 
         0xffff,                /* src_mask */
141 
         0xffff,                /* dst_mask */
142 
         false),                /* pcrel_offset */
143 
  /* A low 8 bit absolute relocation of 16 bit address.
144 
     For LDI command.  */
145 
  HOWTO (R_AVR_LO8_LDI,         /* type */
146 
         0,                      /* rightshift */
147 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
148 
         8,                     /* bitsize */
149 
         false,                 /* pc_relative */
150 
         0,                      /* bitpos */
151 
         complain_overflow_dont, /* complain_on_overflow */
152 
         bfd_elf_generic_reloc, /* special_function */
153 
         "R_AVR_LO8_LDI",       /* name */
154 
         false,                 /* partial_inplace */
155 
         0xffff,                /* src_mask */
156 
         0xffff,                /* dst_mask */
157 
         false),                /* pcrel_offset */
158 
  /* A high 8 bit absolute relocation of 16 bit address.
159 
     For LDI command.  */
160 
  HOWTO (R_AVR_HI8_LDI,         /* type */
161 
         8,                     /* rightshift */
162 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
163 
         8,                     /* bitsize */
164 
         false,                 /* pc_relative */
165 
         0,                      /* bitpos */
166 
         complain_overflow_dont, /* complain_on_overflow */
167 
         bfd_elf_generic_reloc, /* special_function */
168 
         "R_AVR_HI8_LDI",       /* name */
169 
         false,                 /* partial_inplace */
170 
         0xffff,                /* src_mask */
171 
         0xffff,                /* dst_mask */
172 
         false),                /* pcrel_offset */
173 
  /* A high 6 bit absolute relocation of 22 bit address.
174 
     For LDI command.  */
175 
  HOWTO (R_AVR_HH8_LDI,         /* type */
176 
         16,                    /* rightshift */
177 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
178 
         8,                     /* bitsize */
179 
         false,                 /* pc_relative */
180 
         0,                      /* bitpos */
181 
         complain_overflow_dont, /* complain_on_overflow */
182 
         bfd_elf_generic_reloc, /* special_function */
183 
         "R_AVR_HH8_LDI",       /* name */
184 
         false,                 /* partial_inplace */
185 
         0xffff,                /* src_mask */
186 
         0xffff,                /* dst_mask */
187 
         false),                /* pcrel_offset */
188 
  /* A negative low 8 bit absolute relocation of 16 bit address.
189 
     For LDI command.  */
190 
  HOWTO (R_AVR_LO8_LDI_NEG,     /* type */
191 
         0,                      /* rightshift */
192 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
193 
         8,                     /* bitsize */
194 
         false,                 /* pc_relative */
195 
         0,                      /* bitpos */
196 
         complain_overflow_dont, /* complain_on_overflow */
197 
         bfd_elf_generic_reloc, /* special_function */
198 
         "R_AVR_LO8_LDI_NEG",   /* name */
199 
         false,                 /* partial_inplace */
200 
         0xffff,                /* src_mask */
201 
         0xffff,                /* dst_mask */
202 
         false),                /* pcrel_offset */
203 
  /* A hegative high 8 bit absolute relocation of 16 bit address.
204 
     For LDI command.  */
205 
  HOWTO (R_AVR_HI8_LDI_NEG,     /* type */
206 
         8,                     /* rightshift */
207 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
208 
         8,                     /* bitsize */
209 
         false,                 /* pc_relative */
210 
         0,                      /* bitpos */
211 
         complain_overflow_dont, /* complain_on_overflow */
212 
         bfd_elf_generic_reloc, /* special_function */
213 
         "R_AVR_HI8_LDI_NEG",   /* name */
214 
         false,                 /* partial_inplace */
215 
         0xffff,                /* src_mask */
216 
         0xffff,                /* dst_mask */
217 
         false),                /* pcrel_offset */
218 
  /* A hegative high 6 bit absolute relocation of 22 bit address.
219 
     For LDI command.  */
220 
  HOWTO (R_AVR_HH8_LDI_NEG,     /* type */
221 
         16,                    /* rightshift */
222 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
223 
         8,                     /* bitsize */
224 
         false,                 /* pc_relative */
225 
         0,                      /* bitpos */
226 
         complain_overflow_dont, /* complain_on_overflow */
227 
         bfd_elf_generic_reloc, /* special_function */
228 
         "R_AVR_HH8_LDI_NEG",   /* name */
229 
         false,                 /* partial_inplace */
230 
         0xffff,                /* src_mask */
231 
         0xffff,                /* dst_mask */
232 
         false),                /* pcrel_offset */
233 
  /* A low 8 bit absolute relocation of 24 bit program memory address.
234 
     For LDI command.  */
235 
  HOWTO (R_AVR_LO8_LDI_PM,      /* type */
236 
         1,                     /* rightshift */
237 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
238 
         8,                     /* bitsize */
239 
         false,                 /* pc_relative */
240 
         0,                      /* bitpos */
241 
         complain_overflow_dont, /* complain_on_overflow */
242 
         bfd_elf_generic_reloc, /* special_function */
243 
         "R_AVR_LO8_LDI_PM",    /* name */
244 
         false,                 /* partial_inplace */
245 
         0xffff,                /* src_mask */
246 
         0xffff,                /* dst_mask */
247 
         false),                /* pcrel_offset */
248 
  /* A high 8 bit absolute relocation of 16 bit program memory address.
249 
     For LDI command.  */
250 
  HOWTO (R_AVR_HI8_LDI_PM,      /* type */
251 
         9,                     /* rightshift */
252 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
253 
         8,                     /* bitsize */
254 
         false,                 /* pc_relative */
255 
         0,                      /* bitpos */
256 
         complain_overflow_dont, /* complain_on_overflow */
257 
         bfd_elf_generic_reloc, /* special_function */
258 
         "R_AVR_HI8_LDI_PM",    /* name */
259 
         false,                 /* partial_inplace */
260 
         0xffff,                /* src_mask */
261 
         0xffff,                /* dst_mask */
262 
         false),                /* pcrel_offset */
263 
  /* A high 8 bit absolute relocation of 24 bit program memory address.
264 
     For LDI command.  */
265 
  HOWTO (R_AVR_HH8_LDI_PM,      /* type */
266 
         17,                    /* rightshift */
267 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
268 
         8,                     /* bitsize */
269 
         false,                 /* pc_relative */
270 
         0,                      /* bitpos */
271 
         complain_overflow_dont, /* complain_on_overflow */
272 
         bfd_elf_generic_reloc, /* special_function */
273 
         "R_AVR_HH8_LDI_PM",    /* name */
274 
         false,                 /* partial_inplace */
275 
         0xffff,                /* src_mask */
276 
         0xffff,                /* dst_mask */
277 
         false),                /* pcrel_offset */
278 
  /* A low 8 bit absolute relocation of a negative 24 bit
279 
     program memory address.  For LDI command.  */
280 
  HOWTO (R_AVR_LO8_LDI_PM_NEG,  /* type */
281 
         1,                     /* rightshift */
282 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
283 
         8,                     /* bitsize */
284 
         false,                 /* pc_relative */
285 
         0,                      /* bitpos */
286 
         complain_overflow_dont, /* complain_on_overflow */
287 
         bfd_elf_generic_reloc, /* special_function */
288 
         "R_AVR_LO8_LDI_PM_NEG", /* name */
289 
         false,                 /* partial_inplace */
290 
         0xffff,                /* src_mask */
291 
         0xffff,                /* dst_mask */
292 
         false),                /* pcrel_offset */
293 
  /* A high 8 bit absolute relocation of a negative 16 bit
294 
     program memory address.  For LDI command.  */
295 
  HOWTO (R_AVR_HI8_LDI_PM_NEG,  /* type */
296 
         9,                     /* rightshift */
297 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
298 
         8,                     /* bitsize */
299 
         false,                 /* pc_relative */
300 
         0,                      /* bitpos */
301 
         complain_overflow_dont, /* complain_on_overflow */
302 
         bfd_elf_generic_reloc, /* special_function */
303 
         "R_AVR_HI8_LDI_PM_NEG", /* name */
304 
         false,                 /* partial_inplace */
305 
         0xffff,                /* src_mask */
306 
         0xffff,                /* dst_mask */
307 
         false),                /* pcrel_offset */
308 
  /* A high 8 bit absolute relocation of a negative 24 bit
309 
     program memory address.  For LDI command.  */
310 
  HOWTO (R_AVR_HH8_LDI_PM_NEG,  /* type */
311 
         17,                    /* rightshift */
312 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
313 
         8,                     /* bitsize */
314 
         false,                 /* pc_relative */
315 
         0,                      /* bitpos */
316 
         complain_overflow_dont, /* complain_on_overflow */
317 
         bfd_elf_generic_reloc, /* special_function */
318 
         "R_AVR_HH8_LDI_PM_NEG", /* name */
319 
         false,                 /* partial_inplace */
320 
         0xffff,                /* src_mask */
321 
         0xffff,                /* dst_mask */
322 
         false),                /* pcrel_offset */
323 
  /* Relocation for CALL command in ATmega.  */
324 
  HOWTO (R_AVR_CALL,            /* type */
325 
         1,                     /* rightshift */
326 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
327 
         23,                    /* bitsize */
328 
         false,                 /* pc_relative */
329 
         0,                      /* bitpos */
330 
         complain_overflow_dont, /* complain_on_overflow */
331 
         bfd_elf_generic_reloc, /* special_function */
332 
         "R_AVR_CALL",          /* name */
333 
         false,                 /* partial_inplace */
334 
         0xffffffff,            /* src_mask */
335 
         0xffffffff,            /* dst_mask */
336 
         false)                 /* pcrel_offset */
337 
};
338 
 
339 
/* Map BFD reloc types to AVR ELF reloc types.  */
340 
 
341 
struct avr_reloc_map
342 
{
343 
  bfd_reloc_code_real_type bfd_reloc_val;
344 
  unsigned int elf_reloc_val;
345 
};
346 
 
347 
 static const struct avr_reloc_map avr_reloc_map[] =
348 
{
349 
  { BFD_RELOC_NONE,                 R_AVR_NONE },
350 
  { BFD_RELOC_32,                   R_AVR_32 },
351 
  { BFD_RELOC_AVR_7_PCREL,          R_AVR_7_PCREL },
352 
  { BFD_RELOC_AVR_13_PCREL,         R_AVR_13_PCREL },
353 
  { BFD_RELOC_16,                   R_AVR_16 },
354 
  { BFD_RELOC_AVR_16_PM,            R_AVR_16_PM },
355 
  { BFD_RELOC_AVR_LO8_LDI,          R_AVR_LO8_LDI},
356 
  { BFD_RELOC_AVR_HI8_LDI,          R_AVR_HI8_LDI },
357 
  { BFD_RELOC_AVR_HH8_LDI,          R_AVR_HH8_LDI },
358 
  { BFD_RELOC_AVR_LO8_LDI_NEG,      R_AVR_LO8_LDI_NEG },
359 
  { BFD_RELOC_AVR_HI8_LDI_NEG,      R_AVR_HI8_LDI_NEG },
360 
  { BFD_RELOC_AVR_HH8_LDI_NEG,      R_AVR_HH8_LDI_NEG },
361 
  { BFD_RELOC_AVR_LO8_LDI_PM,       R_AVR_LO8_LDI_PM },
362 
  { BFD_RELOC_AVR_HI8_LDI_PM,       R_AVR_HI8_LDI_PM },
363 
  { BFD_RELOC_AVR_HH8_LDI_PM,       R_AVR_HH8_LDI_PM },
364 
  { BFD_RELOC_AVR_LO8_LDI_PM_NEG,   R_AVR_LO8_LDI_PM_NEG },
365 
  { BFD_RELOC_AVR_HI8_LDI_PM_NEG,   R_AVR_HI8_LDI_PM_NEG },
366 
  { BFD_RELOC_AVR_HH8_LDI_PM_NEG,   R_AVR_HH8_LDI_PM_NEG },
367 
  { BFD_RELOC_AVR_CALL,             R_AVR_CALL }
368 
};
369 
 
370 
static reloc_howto_type *
371 
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
372 
     bfd *abfd;
373 
     bfd_reloc_code_real_type code;
374 
{
375 
  unsigned int i;
376 
 
377 
  for (i = 0;
378 
       i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
379 
       i++)
380 
    {
381 
      if (avr_reloc_map[i].bfd_reloc_val == code)
382 
        return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];
383 
    }
384 
 
385 
  return NULL;
386 
}
387 
 
388 
/* Set the howto pointer for an AVR ELF reloc.  */
389 
 
390 
static void
391 
avr_info_to_howto_rela (abfd, cache_ptr, dst)
392 
     bfd *abfd;
393 
     arelent *cache_ptr;
394 
     Elf32_Internal_Rela *dst;
395 
{
396 
  unsigned int r_type;
397 
 
398 
  r_type = ELF32_R_TYPE (dst->r_info);
399 
  BFD_ASSERT (r_type < (unsigned int) R_AVR_max);
400 
  cache_ptr->howto = &elf_avr_howto_table[r_type];
401 
}
402 
 
403 
static asection *
404 
elf32_avr_gc_mark_hook (abfd, info, rel, h, sym)
405 
     bfd *abfd;
406 
     struct bfd_link_info *info;
407 
     Elf_Internal_Rela *rel;
408 
     struct elf_link_hash_entry *h;
409 
     Elf_Internal_Sym *sym;
410 
{
411 
  if (h != NULL)
412 
    {
413 
      switch (ELF32_R_TYPE (rel->r_info))
414 
        {
415 
        default:
416 
          switch (h->root.type)
417 
            {
418 
            case bfd_link_hash_defined:
419 
            case bfd_link_hash_defweak:
420 
              return h->root.u.def.section;
421 
 
422 
            case bfd_link_hash_common:
423 
              return h->root.u.c.p->section;
424 
 
425 
            default:
426 
              break;
427 
            }
428 
        }
429 
    }
430 
  else
431 
    {
432 
      if (!(elf_bad_symtab (abfd)
433 
            && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
434 
          && !((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
435 
               && sym->st_shndx != SHN_COMMON))
436 
        {
437 
          return bfd_section_from_elf_index (abfd, sym->st_shndx);
438 
        }
439 
    }
440 
  return NULL;
441 
}
442 
 
443 
static boolean
444 
elf32_avr_gc_sweep_hook (abfd, info, sec, relocs)
445 
     bfd *abfd;
446 
     struct bfd_link_info *info;
447 
     asection *sec;
448 
     const Elf_Internal_Rela *relocs;
449 
{
450 
  /* We don't use got and plt entries for avr.  */
451 
  return true;
452 
}
453 
 
454 
/* Look through the relocs for a section during the first phase.
455 
   Since we don't do .gots or .plts, we just need to consider the
456 
   virtual table relocs for gc.  */
457 
 
458 
static boolean
459 
elf32_avr_check_relocs (abfd, info, sec, relocs)
460 
     bfd *abfd;
461 
     struct bfd_link_info *info;
462 
     asection *sec;
463 
     const Elf_Internal_Rela *relocs;
464 
{
465 
  Elf_Internal_Shdr *symtab_hdr;
466 
  struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
467 
  const Elf_Internal_Rela *rel;
468 
  const Elf_Internal_Rela *rel_end;
469 
 
470 
  if (info->relocateable)
471 
    return true;
472 
 
473 
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
474 
  sym_hashes = elf_sym_hashes (abfd);
475 
  sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
476 
  if (!elf_bad_symtab (abfd))
477 
    sym_hashes_end -= symtab_hdr->sh_info;
478 
 
479 
  rel_end = relocs + sec->reloc_count;
480 
  for (rel = relocs; rel < rel_end; rel++)
481 
    {
482 
      struct elf_link_hash_entry *h;
483 
      unsigned long r_symndx;
484 
 
485 
      r_symndx = ELF32_R_SYM (rel->r_info);
486 
      if (r_symndx < symtab_hdr->sh_info)
487 
        h = NULL;
488 
      else
489 
        h = sym_hashes[r_symndx - symtab_hdr->sh_info];
490 
    }
491 
 
492 
  return true;
493 
}
494 
 
495 
/* Perform a single relocation.  By default we use the standard BFD
496 
   routines, but a few relocs, we have to do them ourselves.  */
497 
 
498 
static bfd_reloc_status_type
499 
avr_final_link_relocate (howto, input_bfd, input_section,
500 
                         contents, rel, relocation)
501 
     reloc_howto_type *  howto;
502 
     bfd *               input_bfd;
503 
     asection *          input_section;
504 
     bfd_byte *          contents;
505 
     Elf_Internal_Rela * rel;
506 
     bfd_vma             relocation;
507 
{
508 
  bfd_reloc_status_type r = bfd_reloc_ok;
509 
  bfd_vma               x;
510 
  bfd_signed_vma        srel;
511 
 
512 
  switch (howto->type)
513 
    {
514 
    case R_AVR_7_PCREL:
515 
      contents += rel->r_offset;
516 
      srel = (bfd_signed_vma) relocation;
517 
      srel += rel->r_addend;
518 
      srel -= rel->r_offset;
519 
      srel -= 2;        /* Branch instructions add 2 to the PC... */
520 
      srel -= (input_section->output_section->vma +
521 
               input_section->output_offset);
522 
 
523 
      if (srel & 1)
524 
        return bfd_reloc_outofrange;
525 
      if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
526 
        return bfd_reloc_overflow;
527 
      x = bfd_get_16 (input_bfd, contents);
528 
      x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
529 
      bfd_put_16 (input_bfd, x, contents);
530 
      break;
531 
 
532 
    case R_AVR_13_PCREL:
533 
      contents   += rel->r_offset;
534 
      srel = (bfd_signed_vma) relocation;
535 
      srel += rel->r_addend;
536 
      srel -= rel->r_offset;
537 
      srel -= 2;        /* Branch instructions add 2 to the PC... */
538 
      srel -= (input_section->output_section->vma +
539 
               input_section->output_offset);
540 
 
541 
      if (srel & 1)
542 
        return bfd_reloc_outofrange;
543 
 
544 
      /* AVR addresses commands as words.  */
545 
      srel >>= 1;
546 
 
547 
      /* Check for overflow.  */
548 
      if (srel < -2048 || srel > 2047)
549 
        {
550 
          /* Apply WRAPAROUND if possible.  */
551 
          if (bfd_get_mach (input_bfd) == bfd_mach_avr2)
552 
            {
553 
              if (srel > 2047)
554 
                srel -= 4096;
555 
              else
556 
                srel += 4096;
557 
            }
558 
          else
559 
            return bfd_reloc_overflow;
560 
        }
561 
 
562 
      x = bfd_get_16 (input_bfd, contents);
563 
      x = (x & 0xf000) | (srel & 0xfff);
564 
      bfd_put_16 (input_bfd, x, contents);
565 
      break;
566 
 
567 
    case R_AVR_LO8_LDI:
568 
      contents += rel->r_offset;
569 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
570 
      x = bfd_get_16 (input_bfd, contents);
571 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
572 
      bfd_put_16 (input_bfd, x, contents);
573 
      break;
574 
 
575 
    case R_AVR_HI8_LDI:
576 
      contents += rel->r_offset;
577 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
578 
      srel = (srel >> 8) & 0xff;
579 
      x = bfd_get_16 (input_bfd, contents);
580 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
581 
      bfd_put_16 (input_bfd, x, contents);
582 
      break;
583 
 
584 
    case R_AVR_HH8_LDI:
585 
      contents += rel->r_offset;
586 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
587 
      srel = (srel >> 16) & 0xff;
588 
      x = bfd_get_16 (input_bfd, contents);
589 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
590 
      bfd_put_16 (input_bfd, x, contents);
591 
      break;
592 
 
593 
    case R_AVR_LO8_LDI_NEG:
594 
      contents += rel->r_offset;
595 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
596 
      srel = -srel;
597 
      x = bfd_get_16 (input_bfd, contents);
598 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
599 
      bfd_put_16 (input_bfd, x, contents);
600 
      break;
601 
 
602 
    case R_AVR_HI8_LDI_NEG:
603 
      contents += rel->r_offset;
604 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
605 
      srel = -srel;
606 
      srel = (srel >> 8) & 0xff;
607 
      x = bfd_get_16 (input_bfd, contents);
608 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
609 
      bfd_put_16 (input_bfd, x, contents);
610 
      break;
611 
 
612 
    case R_AVR_HH8_LDI_NEG:
613 
      contents += rel->r_offset;
614 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
615 
      srel = -srel;
616 
      srel = (srel >> 16) & 0xff;
617 
      x = bfd_get_16 (input_bfd, contents);
618 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
619 
      bfd_put_16 (input_bfd, x, contents);
620 
      break;
621 
 
622 
    case R_AVR_LO8_LDI_PM:
623 
      contents += rel->r_offset;
624 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
625 
      if (srel & 1)
626 
        return bfd_reloc_outofrange;
627 
      srel = srel >> 1;
628 
      x = bfd_get_16 (input_bfd, contents);
629 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
630 
      bfd_put_16 (input_bfd, x, contents);
631 
      break;
632 
 
633 
    case R_AVR_HI8_LDI_PM:
634 
      contents += rel->r_offset;
635 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
636 
      if (srel & 1)
637 
        return bfd_reloc_outofrange;
638 
      srel = srel >> 1;
639 
      srel = (srel >> 8) & 0xff;
640 
      x = bfd_get_16 (input_bfd, contents);
641 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
642 
      bfd_put_16 (input_bfd, x, contents);
643 
      break;
644 
 
645 
    case R_AVR_HH8_LDI_PM:
646 
      contents += rel->r_offset;
647 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
648 
      if (srel & 1)
649 
        return bfd_reloc_outofrange;
650 
      srel = srel >> 1;
651 
      srel = (srel >> 16) & 0xff;
652 
      x = bfd_get_16 (input_bfd, contents);
653 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
654 
      bfd_put_16 (input_bfd, x, contents);
655 
      break;
656 
 
657 
    case R_AVR_LO8_LDI_PM_NEG:
658 
      contents += rel->r_offset;
659 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
660 
      srel = -srel;
661 
      if (srel & 1)
662 
        return bfd_reloc_outofrange;
663 
      srel = srel >> 1;
664 
      x = bfd_get_16 (input_bfd, contents);
665 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
666 
      bfd_put_16 (input_bfd, x, contents);
667 
      break;
668 
 
669 
    case R_AVR_HI8_LDI_PM_NEG:
670 
      contents += rel->r_offset;
671 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
672 
      srel = -srel;
673 
      if (srel & 1)
674 
        return bfd_reloc_outofrange;
675 
      srel = srel >> 1;
676 
      srel = (srel >> 8) & 0xff;
677 
      x = bfd_get_16 (input_bfd, contents);
678 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
679 
      bfd_put_16 (input_bfd, x, contents);
680 
      break;
681 
 
682 
    case R_AVR_HH8_LDI_PM_NEG:
683 
      contents += rel->r_offset;
684 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
685 
      srel = -srel;
686 
      if (srel & 1)
687 
        return bfd_reloc_outofrange;
688 
      srel = srel >> 1;
689 
      srel = (srel >> 16) & 0xff;
690 
      x = bfd_get_16 (input_bfd, contents);
691 
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
692 
      bfd_put_16 (input_bfd, x, contents);
693 
      break;
694 
 
695 
    case R_AVR_CALL:
696 
      contents += rel->r_offset;
697 
      srel = (bfd_signed_vma) relocation + rel->r_addend;
698 
      if (srel & 1)
699 
        return bfd_reloc_outofrange;
700 
      srel = srel >> 1;
701 
      x = bfd_get_16 (input_bfd, contents);
702 
      x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
703 
      bfd_put_16 (input_bfd, x, contents);
704 
      bfd_put_16 (input_bfd, srel & 0xffff, contents+2);
705 
      break;
706 
 
707 
    default:
708 
      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
709 
                                    contents, rel->r_offset,
710 
                                    relocation, rel->r_addend);
711 
    }
712 
 
713 
  return r;
714 
}
715 
 
716 
/* Relocate an AVR ELF section.  */
717 
static boolean
718 
elf32_avr_relocate_section (output_bfd, info, input_bfd, input_section,
719 
                            contents, relocs, local_syms, local_sections)
720 
     bfd *output_bfd;
721 
     struct bfd_link_info *info;
722 
     bfd *input_bfd;
723 
     asection *input_section;
724 
     bfd_byte *contents;
725 
     Elf_Internal_Rela *relocs;
726 
     Elf_Internal_Sym *local_syms;
727 
     asection **local_sections;
728 
{
729 
  Elf_Internal_Shdr *           symtab_hdr;
730 
  struct elf_link_hash_entry ** sym_hashes;
731 
  Elf_Internal_Rela *           rel;
732 
  Elf_Internal_Rela *           relend;
733 
 
734 
  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
735 
  sym_hashes = elf_sym_hashes (input_bfd);
736 
  relend     = relocs + input_section->reloc_count;
737 
 
738 
  for (rel = relocs; rel < relend; rel ++)
739 
    {
740 
      reloc_howto_type *           howto;
741 
      unsigned long                r_symndx;
742 
      Elf_Internal_Sym *           sym;
743 
      asection *                   sec;
744 
      struct elf_link_hash_entry * h;
745 
      bfd_vma                      relocation;
746 
      bfd_reloc_status_type        r;
747 
      const char *                 name = NULL;
748 
      int                          r_type;
749 
 
750 
      r_type = ELF32_R_TYPE (rel->r_info);
751 
      r_symndx = ELF32_R_SYM (rel->r_info);
752 
 
753 
      if (info->relocateable)
754 
        {
755 
          /* This is a relocateable link.  We don't have to change
756 
             anything, unless the reloc is against a section symbol,
757 
             in which case we have to adjust according to where the
758 
             section symbol winds up in the output section.  */
759 
          if (r_symndx < symtab_hdr->sh_info)
760 
            {
761 
              sym = local_syms + r_symndx;
762 
 
763 
              if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
764 
                {
765 
                  sec = local_sections [r_symndx];
766 
                  rel->r_addend += sec->output_offset + sym->st_value;
767 
                }
768 
            }
769 
 
770 
          continue;
771 
        }
772 
 
773 
      /* This is a final link.  */
774 
      howto  = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info);
775 
      h      = NULL;
776 
      sym    = NULL;
777 
      sec    = NULL;
778 
 
779 
      if (r_symndx < symtab_hdr->sh_info)
780 
        {
781 
          sym = local_syms + r_symndx;
782 
          sec = local_sections [r_symndx];
783 
          relocation = (sec->output_section->vma
784 
                        + sec->output_offset
785 
                        + sym->st_value);
786 
 
787 
          name = bfd_elf_string_from_elf_section
788 
            (input_bfd, symtab_hdr->sh_link, sym->st_name);
789 
          name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
790 
        }
791 
      else
792 
        {
793 
          h = sym_hashes [r_symndx - symtab_hdr->sh_info];
794 
 
795 
          while (h->root.type == bfd_link_hash_indirect
796 
                 || h->root.type == bfd_link_hash_warning)
797 
            h = (struct elf_link_hash_entry *) h->root.u.i.link;
798 
 
799 
          name = h->root.root.string;
800 
 
801 
          if (h->root.type == bfd_link_hash_defined
802 
              || h->root.type == bfd_link_hash_defweak)
803 
            {
804 
              sec = h->root.u.def.section;
805 
              relocation = (h->root.u.def.value
806 
                            + sec->output_section->vma
807 
                            + sec->output_offset);
808 
            }
809 
          else if (h->root.type == bfd_link_hash_undefweak)
810 
            {
811 
              relocation = 0;
812 
            }
813 
          else
814 
            {
815 
              if (! ((*info->callbacks->undefined_symbol)
816 
                     (info, h->root.root.string, input_bfd,
817 
                      input_section, rel->r_offset, true)))
818 
                return false;
819 
              relocation = 0;
820 
            }
821 
        }
822 
 
823 
      r = avr_final_link_relocate (howto, input_bfd, input_section,
824 
                                   contents, rel, relocation);
825 
 
826 
      if (r != bfd_reloc_ok)
827 
        {
828 
          const char * msg = (const char *) NULL;
829 
 
830 
          switch (r)
831 
            {
832 
            case bfd_reloc_overflow:
833 
              r = info->callbacks->reloc_overflow
834 
                (info, name, howto->name, (bfd_vma) 0,
835 
                 input_bfd, input_section, rel->r_offset);
836 
              break;
837 
 
838 
            case bfd_reloc_undefined:
839 
              r = info->callbacks->undefined_symbol
840 
                (info, name, input_bfd, input_section, rel->r_offset, true);
841 
              break;
842 
 
843 
            case bfd_reloc_outofrange:
844 
              msg = _("internal error: out of range error");
845 
              break;
846 
 
847 
            case bfd_reloc_notsupported:
848 
              msg = _("internal error: unsupported relocation error");
849 
              break;
850 
 
851 
            case bfd_reloc_dangerous:
852 
              msg = _("internal error: dangerous relocation");
853 
              break;
854 
 
855 
            default:
856 
              msg = _("internal error: unknown error");
857 
              break;
858 
            }
859 
 
860 
          if (msg)
861 
            r = info->callbacks->warning
862 
              (info, msg, name, input_bfd, input_section, rel->r_offset);
863 
 
864 
          if (! r)
865 
            return false;
866 
        }
867 
    }
868 
 
869 
  return true;
870 
}
871 
 
872 
/* The final processing done just before writing out a AVR ELF object
873 
   file.  This gets the AVR architecture right based on the machine
874 
   number.  */
875 
 
876 
static void
877 
bfd_elf_avr_final_write_processing (abfd, linker)
878 
     bfd *abfd;
879 
     boolean linker ATTRIBUTE_UNUSED;
880 
{
881 
  unsigned long val;
882 
 
883 
  switch (bfd_get_mach (abfd))
884 
    {
885 
    default:
886 
    case bfd_mach_avr2:
887 
      val = E_AVR_MACH_AVR2;
888 
      break;
889 
 
890 
    case bfd_mach_avr1:
891 
      val = E_AVR_MACH_AVR1;
892 
      break;
893 
 
894 
    case bfd_mach_avr3:
895 
      val = E_AVR_MACH_AVR3;
896 
      break;
897 
 
898 
    case bfd_mach_avr4:
899 
      val = E_AVR_MACH_AVR4;
900 
      break;
901 
 
902 
    }
903 
 
904 
  elf_elfheader (abfd)->e_machine = EM_AVR;
905 
  elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
906 
  elf_elfheader (abfd)->e_flags |= val;
907 
}
908 
 
909 
/* Set the right machine number.  */
910 
 
911 
static boolean
912 
elf32_avr_object_p (abfd)
913 
     bfd *abfd;
914 
{
915 
  int e_set = bfd_mach_avr2;
916 
  if (elf_elfheader (abfd)->e_machine == EM_AVR)
917 
    {
918 
      int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;
919 
      switch (e_mach)
920 
        {
921 
        default:
922 
        case E_AVR_MACH_AVR2:
923 
          e_set = bfd_mach_avr2;
924 
          break;
925 
 
926 
        case E_AVR_MACH_AVR1:
927 
          e_set = bfd_mach_avr1;
928 
          break;
929 
 
930 
        case E_AVR_MACH_AVR3:
931 
          e_set = bfd_mach_avr3;
932 
          break;
933 
 
934 
        case E_AVR_MACH_AVR4:
935 
          e_set = bfd_mach_avr4;
936 
          break;
937 
        }
938 
    }
939 
  return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
940 
                                    e_set);
941 
}
942 
 
943 
 
944 
#define ELF_ARCH                bfd_arch_avr
945 
#define ELF_MACHINE_CODE        EM_AVR
946 
#define ELF_MAXPAGESIZE         1
947 
 
948 
#define TARGET_LITTLE_SYM       bfd_elf32_avr_vec
949 
#define TARGET_LITTLE_NAME      "elf32-avr"
950 
 
951 
#define elf_info_to_howto                    avr_info_to_howto_rela
952 
#define elf_info_to_howto_rel                NULL
953 
#define elf_backend_relocate_section         elf32_avr_relocate_section
954 
#define elf_backend_gc_mark_hook             elf32_avr_gc_mark_hook
955 
#define elf_backend_gc_sweep_hook            elf32_avr_gc_sweep_hook
956 
#define elf_backend_check_relocs             elf32_avr_check_relocs
957 
#define elf_backend_can_gc_sections          1
958 
#define elf_backend_final_write_processing \
959 
                                        bfd_elf_avr_final_write_processing
960 
#define elf_backend_object_p            elf32_avr_object_p
961 
 
962 
 
963 
#include "elf32-target.h"

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