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1 104 markom 
/* Support for 32-bit Alpha NLM (NetWare Loadable Module)
2 
   Copyright (C) 1993 Free Software Foundation, Inc.
3 
   Written by Ian Lance Taylor, Cygnus Support.
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 
/* This file describes the 32 bit Alpha NLM format.  You might think
22 
   that an Alpha chip would use a 64 bit format, but, for some reason,
23 
   it doesn't.  */
24 
 
25 
#include "bfd.h"
26 
#include "sysdep.h"
27 
#include "libbfd.h"
28 
 
29 
#define ARCH_SIZE 32
30 
 
31 
#include "nlm/alpha-ext.h"
32 
#define Nlm_External_Fixed_Header       Nlm32_alpha_External_Fixed_Header
33 
 
34 
#include "libnlm.h"
35 
 
36 
static boolean nlm_alpha_backend_object_p
37 
  PARAMS ((bfd *));
38 
static boolean nlm_alpha_write_prefix
39 
  PARAMS ((bfd *));
40 
static boolean nlm_alpha_read_reloc
41 
  PARAMS ((bfd *, nlmNAME(symbol_type) *, asection **, arelent *));
42 
static boolean nlm_alpha_mangle_relocs
43 
  PARAMS ((bfd *, asection *, PTR, bfd_vma, bfd_size_type));
44 
static boolean nlm_alpha_read_import
45 
  PARAMS ((bfd *, nlmNAME(symbol_type) *));
46 
static boolean nlm_alpha_write_import
47 
  PARAMS ((bfd *, asection *, arelent *));
48 
static boolean nlm_alpha_set_public_section
49 
  PARAMS ((bfd *, nlmNAME(symbol_type) *));
50 
static bfd_vma nlm_alpha_get_public_offset
51 
  PARAMS ((bfd *, asymbol *));
52 
static boolean nlm_alpha_write_external
53 
  PARAMS ((bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *));
54 
 
55 
/* Alpha NLM's have a prefix header before the standard NLM.  This
56 
   function reads it in, verifies the version, and seeks the bfd to
57 
   the location before the regular NLM header.  */
58 
 
59 
static boolean
60 
nlm_alpha_backend_object_p (abfd)
61 
     bfd *abfd;
62 
{
63 
  struct nlm32_alpha_external_prefix_header s;
64 
  bfd_size_type size;
65 
 
66 
  if (bfd_read ((PTR) &s, sizeof s, 1, abfd) != sizeof s)
67 
    return false;
68 
 
69 
  if (bfd_h_get_32 (abfd, s.magic) != NLM32_ALPHA_MAGIC)
70 
    return false;
71 
 
72 
  /* FIXME: Should we check the format number?  */
73 
 
74 
  /* Skip to the end of the header.  */
75 
  size = bfd_h_get_32 (abfd, s.size);
76 
  if (bfd_seek (abfd, size, SEEK_SET) != 0)
77 
    return false;
78 
 
79 
  return true;
80 
}
81 
 
82 
/* Write out the prefix.  */
83 
 
84 
static boolean
85 
nlm_alpha_write_prefix (abfd)
86 
     bfd *abfd;
87 
{
88 
  struct nlm32_alpha_external_prefix_header s;
89 
 
90 
  memset (&s, 0, sizeof s);
91 
  bfd_h_put_32 (abfd, (bfd_vma) NLM32_ALPHA_MAGIC, s.magic);
92 
  bfd_h_put_32 (abfd, (bfd_vma) 2, s.format);
93 
  bfd_h_put_32 (abfd, (bfd_vma) sizeof s, s.size);
94 
  if (bfd_write ((PTR) &s, sizeof s, 1, abfd) != sizeof s)
95 
    return false;
96 
  return true;
97 
}
98 
 
99 
/* How to process the various reloc types.  */
100 
 
101 
static reloc_howto_type nlm32_alpha_howto_table[] =
102 
{
103 
  /* Reloc type 0 is ignored by itself.  However, it appears after a
104 
     GPDISP reloc to identify the location where the low order 16 bits
105 
     of the gp register are loaded.  */
106 
  HOWTO (ALPHA_R_IGNORE,        /* type */
107 
         0,                      /* rightshift */
108 
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
109 
         8,                     /* bitsize */
110 
         false,                 /* pc_relative */
111 
         0,                      /* bitpos */
112 
         complain_overflow_dont, /* complain_on_overflow */
113 
         0,                      /* special_function */
114 
         "IGNORE",              /* name */
115 
         false,                 /* partial_inplace */
116 
         0,                      /* src_mask */
117 
         0,                      /* dst_mask */
118 
         false),                /* pcrel_offset */
119 
 
120 
  /* A 32 bit reference to a symbol.  */
121 
  HOWTO (ALPHA_R_REFLONG,       /* type */
122 
         0,                      /* rightshift */
123 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
124 
         32,                    /* bitsize */
125 
         false,                 /* pc_relative */
126 
         0,                      /* bitpos */
127 
         complain_overflow_bitfield, /* complain_on_overflow */
128 
         0,                      /* special_function */
129 
         "REFLONG",             /* name */
130 
         true,                  /* partial_inplace */
131 
         0xffffffff,            /* src_mask */
132 
         0xffffffff,            /* dst_mask */
133 
         false),                /* pcrel_offset */
134 
 
135 
  /* A 64 bit reference to a symbol.  */
136 
  HOWTO (ALPHA_R_REFQUAD,       /* type */
137 
         0,                      /* rightshift */
138 
         4,                     /* size (0 = byte, 1 = short, 2 = long) */
139 
         64,                    /* bitsize */
140 
         false,                 /* pc_relative */
141 
         0,                      /* bitpos */
142 
         complain_overflow_bitfield, /* complain_on_overflow */
143 
         0,                      /* special_function */
144 
         "REFQUAD",             /* name */
145 
         true,                  /* partial_inplace */
146 
         0xffffffffffffffff,    /* src_mask */
147 
         0xffffffffffffffff,    /* dst_mask */
148 
         false),                /* pcrel_offset */
149 
 
150 
  /* A 32 bit GP relative offset.  This is just like REFLONG except
151 
     that when the value is used the value of the gp register will be
152 
     added in.  */
153 
  HOWTO (ALPHA_R_GPREL32,       /* type */
154 
         0,                      /* rightshift */
155 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
156 
         32,                    /* bitsize */
157 
         false,                 /* pc_relative */
158 
         0,                      /* bitpos */
159 
         complain_overflow_bitfield, /* complain_on_overflow */
160 
         0,                      /* special_function */
161 
         "GPREL32",             /* name */
162 
         true,                  /* partial_inplace */
163 
         0xffffffff,            /* src_mask */
164 
         0xffffffff,            /* dst_mask */
165 
         false),                /* pcrel_offset */
166 
 
167 
  /* Used for an instruction that refers to memory off the GP
168 
     register.  The offset is 16 bits of the 32 bit instruction.  This
169 
     reloc always seems to be against the .lita section.  */
170 
  HOWTO (ALPHA_R_LITERAL,       /* type */
171 
         0,                      /* rightshift */
172 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
173 
         16,                    /* bitsize */
174 
         false,                 /* pc_relative */
175 
         0,                      /* bitpos */
176 
         complain_overflow_signed, /* complain_on_overflow */
177 
         0,                      /* special_function */
178 
         "LITERAL",             /* name */
179 
         true,                  /* partial_inplace */
180 
         0xffff,                /* src_mask */
181 
         0xffff,                /* dst_mask */
182 
         false),                /* pcrel_offset */
183 
 
184 
  /* This reloc only appears immediately following a LITERAL reloc.
185 
     It identifies a use of the literal.  It seems that the linker can
186 
     use this to eliminate a portion of the .lita section.  The symbol
187 
     index is special: 1 means the literal address is in the base
188 
     register of a memory format instruction; 2 means the literal
189 
     address is in the byte offset register of a byte-manipulation
190 
     instruction; 3 means the literal address is in the target
191 
     register of a jsr instruction.  This does not actually do any
192 
     relocation.  */
193 
  HOWTO (ALPHA_R_LITUSE,        /* type */
194 
         0,                      /* rightshift */
195 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
196 
         32,                    /* bitsize */
197 
         false,                 /* pc_relative */
198 
         0,                      /* bitpos */
199 
         complain_overflow_dont, /* complain_on_overflow */
200 
         0,                      /* special_function */
201 
         "LITUSE",              /* name */
202 
         false,                 /* partial_inplace */
203 
         0,                      /* src_mask */
204 
         0,                      /* dst_mask */
205 
         false),                /* pcrel_offset */
206 
 
207 
  /* Load the gp register.  This is always used for a ldah instruction
208 
     which loads the upper 16 bits of the gp register.  The next reloc
209 
     will be an IGNORE reloc which identifies the location of the lda
210 
     instruction which loads the lower 16 bits.  The symbol index of
211 
     the GPDISP instruction appears to actually be the number of bytes
212 
     between the ldah and lda instructions.  This gives two different
213 
     ways to determine where the lda instruction is; I don't know why
214 
     both are used.  The value to use for the relocation is the
215 
     difference between the GP value and the current location; the
216 
     load will always be done against a register holding the current
217 
     address.  */
218 
  HOWTO (ALPHA_R_GPDISP,        /* type */
219 
         16,                    /* rightshift */
220 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
221 
         16,                    /* bitsize */
222 
         true,                  /* pc_relative */
223 
         0,                      /* bitpos */
224 
         complain_overflow_dont, /* complain_on_overflow */
225 
         0,                      /* special_function */
226 
         "GPDISP",              /* name */
227 
         true,                  /* partial_inplace */
228 
         0xffff,                /* src_mask */
229 
         0xffff,                /* dst_mask */
230 
         true),                 /* pcrel_offset */
231 
 
232 
  /* A 21 bit branch.  The native assembler generates these for
233 
     branches within the text segment, and also fills in the PC
234 
     relative offset in the instruction.  It seems to me that this
235 
     reloc, unlike the others, is not partial_inplace.  */
236 
  HOWTO (ALPHA_R_BRADDR,        /* type */
237 
         2,                     /* rightshift */
238 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
239 
         21,                    /* bitsize */
240 
         true,                  /* pc_relative */
241 
         0,                      /* bitpos */
242 
         complain_overflow_signed, /* complain_on_overflow */
243 
         0,                      /* special_function */
244 
         "BRADDR",              /* name */
245 
         false,                 /* partial_inplace */
246 
         0,                      /* src_mask */
247 
         0x1fffff,              /* dst_mask */
248 
         false),                /* pcrel_offset */
249 
 
250 
  /* A hint for a jump to a register.  */
251 
  HOWTO (ALPHA_R_HINT,          /* type */
252 
         2,                     /* rightshift */
253 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
254 
         14,                    /* bitsize */
255 
         false,                 /* pc_relative */
256 
         0,                      /* bitpos */
257 
         complain_overflow_dont, /* complain_on_overflow */
258 
         0,                      /* special_function */
259 
         "HINT",                /* name */
260 
         true,                  /* partial_inplace */
261 
         0x3fff,                /* src_mask */
262 
         0x3fff,                /* dst_mask */
263 
         false),                /* pcrel_offset */
264 
 
265 
  /* 16 bit PC relative offset.  */
266 
  HOWTO (ALPHA_R_SREL16,        /* type */
267 
         0,                      /* rightshift */
268 
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
269 
         16,                    /* bitsize */
270 
         true,                  /* pc_relative */
271 
         0,                      /* bitpos */
272 
         complain_overflow_signed, /* complain_on_overflow */
273 
         0,                      /* special_function */
274 
         "SREL16",              /* name */
275 
         true,                  /* partial_inplace */
276 
         0xffff,                /* src_mask */
277 
         0xffff,                /* dst_mask */
278 
         false),                /* pcrel_offset */
279 
 
280 
  /* 32 bit PC relative offset.  */
281 
  HOWTO (ALPHA_R_SREL32,        /* type */
282 
         0,                      /* rightshift */
283 
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
284 
         32,                    /* bitsize */
285 
         true,                  /* pc_relative */
286 
         0,                      /* bitpos */
287 
         complain_overflow_signed, /* complain_on_overflow */
288 
         0,                      /* special_function */
289 
         "SREL32",              /* name */
290 
         true,                  /* partial_inplace */
291 
         0xffffffff,            /* src_mask */
292 
         0xffffffff,            /* dst_mask */
293 
         false),                /* pcrel_offset */
294 
 
295 
  /* A 64 bit PC relative offset.  */
296 
  HOWTO (ALPHA_R_SREL64,        /* type */
297 
         0,                      /* rightshift */
298 
         4,                     /* size (0 = byte, 1 = short, 2 = long) */
299 
         64,                    /* bitsize */
300 
         true,                  /* pc_relative */
301 
         0,                      /* bitpos */
302 
         complain_overflow_signed, /* complain_on_overflow */
303 
         0,                      /* special_function */
304 
         "SREL64",              /* name */
305 
         true,                  /* partial_inplace */
306 
         0xffffffffffffffff,    /* src_mask */
307 
         0xffffffffffffffff,    /* dst_mask */
308 
         false),                /* pcrel_offset */
309 
 
310 
  /* Push a value on the reloc evaluation stack.  */
311 
  HOWTO (ALPHA_R_OP_PUSH,       /* type */
312 
         0,                      /* rightshift */
313 
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
314 
         0,                      /* bitsize */
315 
         false,                 /* pc_relative */
316 
         0,                      /* bitpos */
317 
         complain_overflow_dont, /* complain_on_overflow */
318 
         0,                      /* special_function */
319 
         "OP_PUSH",             /* name */
320 
         false,                 /* partial_inplace */
321 
         0,                      /* src_mask */
322 
         0,                      /* dst_mask */
323 
         false),                /* pcrel_offset */
324 
 
325 
  /* Store the value from the stack at the given address.  Store it in
326 
     a bitfield of size r_size starting at bit position r_offset.  */
327 
  HOWTO (ALPHA_R_OP_STORE,      /* type */
328 
         0,                      /* rightshift */
329 
         4,                     /* size (0 = byte, 1 = short, 2 = long) */
330 
         64,                    /* bitsize */
331 
         false,                 /* pc_relative */
332 
         0,                      /* bitpos */
333 
         complain_overflow_dont, /* complain_on_overflow */
334 
         0,                      /* special_function */
335 
         "OP_STORE",            /* name */
336 
         false,                 /* partial_inplace */
337 
         0,                      /* src_mask */
338 
         0xffffffffffffffff,    /* dst_mask */
339 
         false),                /* pcrel_offset */
340 
 
341 
  /* Subtract the reloc address from the value on the top of the
342 
     relocation stack.  */
343 
  HOWTO (ALPHA_R_OP_PSUB,       /* type */
344 
         0,                      /* rightshift */
345 
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
346 
         0,                      /* bitsize */
347 
         false,                 /* pc_relative */
348 
         0,                      /* bitpos */
349 
         complain_overflow_dont, /* complain_on_overflow */
350 
         0,                      /* special_function */
351 
         "OP_PSUB",             /* name */
352 
         false,                 /* partial_inplace */
353 
         0,                      /* src_mask */
354 
         0,                      /* dst_mask */
355 
         false),                /* pcrel_offset */
356 
 
357 
  /* Shift the value on the top of the relocation stack right by the
358 
     given value.  */
359 
  HOWTO (ALPHA_R_OP_PRSHIFT,    /* type */
360 
         0,                      /* rightshift */
361 
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
362 
         0,                      /* bitsize */
363 
         false,                 /* pc_relative */
364 
         0,                      /* bitpos */
365 
         complain_overflow_dont, /* complain_on_overflow */
366 
         0,                       /* special_function */
367 
         "OP_PRSHIFT",          /* name */
368 
         false,                 /* partial_inplace */
369 
         0,                      /* src_mask */
370 
         0,                      /* dst_mask */
371 
         false),                /* pcrel_offset */
372 
 
373 
  /* Adjust the GP value for a new range in the object file.  */
374 
  HOWTO (ALPHA_R_GPVALUE,       /* type */
375 
         0,                      /* rightshift */
376 
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
377 
         0,                      /* bitsize */
378 
         false,                 /* pc_relative */
379 
         0,                      /* bitpos */
380 
         complain_overflow_dont, /* complain_on_overflow */
381 
         0,                      /* special_function */
382 
         "GPVALUE",             /* name */
383 
         false,                 /* partial_inplace */
384 
         0,                      /* src_mask */
385 
         0,                      /* dst_mask */
386 
         false)                 /* pcrel_offset */
387 
};
388 
 
389 
static reloc_howto_type nlm32_alpha_nw_howto =
390 
  HOWTO (ALPHA_R_NW_RELOC,      /* type */
391 
         0,                      /* rightshift */
392 
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
393 
         0,                      /* bitsize */
394 
         false,                 /* pc_relative */
395 
         0,                      /* bitpos */
396 
         complain_overflow_dont, /* complain_on_overflow */
397 
         0,                      /* special_function */
398 
         "NW_RELOC",            /* name */
399 
         false,                 /* partial_inplace */
400 
         0,                      /* src_mask */
401 
         0,                      /* dst_mask */
402 
         false);                /* pcrel_offset */
403 
 
404 
/* Read an Alpha NLM reloc.  This routine keeps some static data which
405 
   it uses when handling local relocs.  This only works correctly
406 
   because all the local relocs are read at once.  */
407 
 
408 
static boolean
409 
nlm_alpha_read_reloc (abfd, sym, secp, rel)
410 
     bfd *abfd;
411 
     nlmNAME(symbol_type) *sym;
412 
     asection **secp;
413 
     arelent *rel;
414 
{
415 
  static bfd_vma gp_value;
416 
  static bfd_vma lita_address;
417 
  struct nlm32_alpha_external_reloc ext;
418 
  bfd_vma r_vaddr;
419 
  long r_symndx;
420 
  int r_type, r_extern, r_offset, r_size;
421 
  asection *code_sec, *data_sec;
422 
 
423 
  /* Read the reloc from the file.  */
424 
  if (bfd_read (&ext, sizeof ext, 1, abfd) != sizeof ext)
425 
    return false;
426 
 
427 
  /* Swap in the reloc information.  */
428 
  r_vaddr = bfd_h_get_64 (abfd, (bfd_byte *) ext.r_vaddr);
429 
  r_symndx = bfd_h_get_32 (abfd, (bfd_byte *) ext.r_symndx);
430 
 
431 
  BFD_ASSERT (bfd_little_endian (abfd));
432 
 
433 
  r_type = ((ext.r_bits[0] & RELOC_BITS0_TYPE_LITTLE)
434 
            >> RELOC_BITS0_TYPE_SH_LITTLE);
435 
  r_extern = (ext.r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0;
436 
  r_offset = ((ext.r_bits[1] & RELOC_BITS1_OFFSET_LITTLE)
437 
              >> RELOC_BITS1_OFFSET_SH_LITTLE);
438 
  /* Ignore the reserved bits.  */
439 
  r_size = ((ext.r_bits[3] & RELOC_BITS3_SIZE_LITTLE)
440 
            >> RELOC_BITS3_SIZE_SH_LITTLE);
441 
 
442 
  /* Fill in the BFD arelent structure.  */
443 
  code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
444 
  data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
445 
  if (r_extern)
446 
    {
447 
      /* External relocations are only used for imports.  */
448 
      BFD_ASSERT (sym != NULL);
449 
      /* We don't need to set sym_ptr_ptr for this case.  It is set in
450 
         nlm_canonicalize_reloc.  */
451 
      rel->sym_ptr_ptr = NULL;
452 
      rel->addend = 0;
453 
    }
454 
  else
455 
    {
456 
      /* Internal relocations are only used for local relocation
457 
         fixups.  If they are not NW_RELOC or GPDISP or IGNORE, they
458 
         must be against .text or .data.  */
459 
      BFD_ASSERT (r_type == ALPHA_R_NW_RELOC || sym == NULL);
460 
      if (r_type == ALPHA_R_NW_RELOC
461 
          || r_type == ALPHA_R_GPDISP
462 
          || r_type == ALPHA_R_IGNORE)
463 
        {
464 
          rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
465 
          rel->addend = 0;
466 
        }
467 
      else if (r_symndx == ALPHA_RELOC_SECTION_TEXT)
468 
        {
469 
          rel->sym_ptr_ptr = code_sec->symbol_ptr_ptr;
470 
          BFD_ASSERT (bfd_get_section_vma (abfd, code_sec) == 0);
471 
          rel->addend = 0;
472 
        }
473 
      else if (r_symndx == ALPHA_RELOC_SECTION_DATA)
474 
        {
475 
          rel->sym_ptr_ptr = data_sec->symbol_ptr_ptr;
476 
          rel->addend = - bfd_get_section_vma (abfd, data_sec);
477 
        }
478 
      else
479 
        {
480 
          BFD_ASSERT (0);
481 
          rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
482 
          rel->addend = 0;
483 
        }
484 
    }
485 
 
486 
  /* We use the address to determine whether the reloc is in the .text
487 
     or .data section.  R_NW_RELOC relocs don't really have a section,
488 
     so we put them in .text.  */
489 
  if (r_type == ALPHA_R_NW_RELOC
490 
      || r_vaddr < bfd_section_size (abfd, code_sec))
491 
    {
492 
      *secp = code_sec;
493 
      rel->address = r_vaddr;
494 
    }
495 
  else
496 
    {
497 
      *secp = data_sec;
498 
      rel->address = r_vaddr - bfd_section_size (abfd, code_sec);
499 
    }
500 
 
501 
  /* We must adjust the addend based on the type.  */
502 
  BFD_ASSERT ((r_type >= 0 && r_type <= ALPHA_R_GPVALUE)
503 
              || r_type == ALPHA_R_NW_RELOC);
504 
 
505 
  switch (r_type)
506 
    {
507 
    case ALPHA_R_BRADDR:
508 
    case ALPHA_R_SREL16:
509 
    case ALPHA_R_SREL32:
510 
    case ALPHA_R_SREL64:
511 
      /* The PC relative relocs do not seem to use the section VMA as
512 
         a negative addend.  */
513 
      rel->addend = 0;
514 
      break;
515 
 
516 
    case ALPHA_R_GPREL32:
517 
      /* Copy the gp value for this object file into the addend, to
518 
         ensure that we are not confused by the linker.  */
519 
      if (! r_extern)
520 
        rel->addend += gp_value;
521 
      break;
522 
 
523 
    case ALPHA_R_LITERAL:
524 
      BFD_ASSERT (! r_extern);
525 
      rel->addend += lita_address;
526 
      break;
527 
 
528 
    case ALPHA_R_LITUSE:
529 
    case ALPHA_R_GPDISP:
530 
      /* The LITUSE and GPDISP relocs do not use a symbol, or an
531 
         addend, but they do use a special code.  Put this code in the
532 
         addend field.  */
533 
      rel->addend = r_symndx;
534 
      rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
535 
      break;
536 
 
537 
    case ALPHA_R_OP_STORE:
538 
      /* The STORE reloc needs the size and offset fields.  We store
539 
         them in the addend.  */
540 
      BFD_ASSERT (r_offset < 256 && r_size < 256);
541 
      rel->addend = (r_offset << 8) + r_size;
542 
      break;
543 
 
544 
    case ALPHA_R_OP_PUSH:
545 
    case ALPHA_R_OP_PSUB:
546 
    case ALPHA_R_OP_PRSHIFT:
547 
      /* The PUSH, PSUB and PRSHIFT relocs do not actually use an
548 
         address.  I believe that the address supplied is really an
549 
         addend.  */
550 
      rel->addend = r_vaddr;
551 
      break;
552 
 
553 
    case ALPHA_R_GPVALUE:
554 
      /* Record the new gp value.  */
555 
      gp_value += r_symndx;
556 
      rel->addend = gp_value;
557 
      break;
558 
 
559 
    case ALPHA_R_IGNORE:
560 
      /* If the type is ALPHA_R_IGNORE, make sure this is a reference
561 
         to the absolute section so that the reloc is ignored.  For
562 
         some reason the address of this reloc type is not adjusted by
563 
         the section vma.  We record the gp value for this object file
564 
         here, for convenience when doing the GPDISP relocation.  */
565 
      rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
566 
      rel->address = r_vaddr;
567 
      rel->addend = gp_value;
568 
      break;
569 
 
570 
    case ALPHA_R_NW_RELOC:
571 
      /* If this is SETGP, we set the addend to 0.  Otherwise we set
572 
         the addend to the size of the .lita section (this is
573 
         r_symndx) plus 1.  We have already set the address of the
574 
         reloc to r_vaddr.  */
575 
      if (r_size == ALPHA_R_NW_RELOC_SETGP)
576 
        {
577 
          gp_value = r_vaddr;
578 
          rel->addend = 0;
579 
        }
580 
      else if (r_size == ALPHA_R_NW_RELOC_LITA)
581 
        {
582 
          lita_address = r_vaddr;
583 
          rel->addend = r_symndx + 1;
584 
        }
585 
      else
586 
        BFD_ASSERT (0);
587 
      rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
588 
      break;
589 
 
590 
    default:
591 
      break;
592 
    }
593 
 
594 
  if (r_type == ALPHA_R_NW_RELOC)
595 
    rel->howto = &nlm32_alpha_nw_howto;
596 
  else
597 
    rel->howto = &nlm32_alpha_howto_table[r_type];
598 
 
599 
  return true;
600 
}
601 
 
602 
/* Mangle Alpha NLM relocs for output.  */
603 
 
604 
static boolean
605 
nlm_alpha_mangle_relocs (abfd, sec, data, offset, count)
606 
     bfd *abfd;
607 
     asection *sec;
608 
     PTR data;
609 
     bfd_vma offset;
610 
     bfd_size_type count;
611 
{
612 
  return true;
613 
}
614 
 
615 
/* Read an ALPHA NLM import record */
616 
 
617 
static boolean
618 
nlm_alpha_read_import (abfd, sym)
619 
     bfd *abfd;
620 
     nlmNAME(symbol_type) *sym;
621 
{
622 
  struct nlm_relent *nlm_relocs;        /* relocation records for symbol */
623 
  bfd_size_type rcount;                 /* number of relocs */
624 
  bfd_byte temp[NLM_TARGET_LONG_SIZE];  /* temporary 32-bit value */
625 
  unsigned char symlength;              /* length of symbol name */
626 
  char *name;
627 
 
628 
  if (bfd_read ((PTR) &symlength, sizeof (symlength), 1, abfd)
629 
      != sizeof (symlength))
630 
    return false;
631 
  sym -> symbol.the_bfd = abfd;
632 
  name = bfd_alloc (abfd, symlength + 1);
633 
  if (name == NULL)
634 
    return false;
635 
  if (bfd_read (name, symlength, 1, abfd) != symlength)
636 
    return false;
637 
  name[symlength] = '\0';
638 
  sym -> symbol.name = name;
639 
  sym -> symbol.flags = 0;
640 
  sym -> symbol.value = 0;
641 
  sym -> symbol.section = bfd_und_section_ptr;
642 
  if (bfd_read ((PTR) temp, sizeof (temp), 1, abfd) != sizeof (temp))
643 
    return false;
644 
  rcount = bfd_h_get_32 (abfd, temp);
645 
  nlm_relocs = ((struct nlm_relent *)
646 
                bfd_alloc (abfd, rcount * sizeof (struct nlm_relent)));
647 
  if (!nlm_relocs)
648 
    return false;
649 
  sym -> relocs = nlm_relocs;
650 
  sym -> rcnt = 0;
651 
  while (sym -> rcnt < rcount)
652 
    {
653 
      asection *section;
654 
 
655 
      if (nlm_alpha_read_reloc (abfd, sym, &section,
656 
                                &nlm_relocs -> reloc)
657 
          == false)
658 
        return false;
659 
      nlm_relocs -> section = section;
660 
      nlm_relocs++;
661 
      sym -> rcnt++;
662 
    }
663 
 
664 
  return true;
665 
}
666 
 
667 
/* Write an Alpha NLM reloc.  */
668 
 
669 
static boolean
670 
nlm_alpha_write_import (abfd, sec, rel)
671 
     bfd *abfd;
672 
     asection *sec;
673 
     arelent *rel;
674 
{
675 
  asymbol *sym;
676 
  bfd_vma r_vaddr;
677 
  long r_symndx;
678 
  int r_type, r_extern, r_offset, r_size;
679 
  struct nlm32_alpha_external_reloc ext;
680 
 
681 
  sym = *rel->sym_ptr_ptr;
682 
 
683 
  /* Get values for the relocation fields.  */
684 
  r_type = rel->howto->type;
685 
  if (r_type != ALPHA_R_NW_RELOC)
686 
    {
687 
      r_vaddr = bfd_get_section_vma (abfd, sec) + rel->address;
688 
      if ((sec->flags & SEC_CODE) == 0)
689 
        r_vaddr += bfd_section_size (abfd,
690 
                                     bfd_get_section_by_name (abfd,
691 
                                                              NLM_CODE_NAME));
692 
      if (bfd_is_und_section (bfd_get_section (sym)))
693 
        {
694 
          r_extern = 1;
695 
          r_symndx = 0;
696 
        }
697 
      else
698 
        {
699 
          r_extern = 0;
700 
          if (bfd_get_section_flags (abfd, bfd_get_section (sym)) & SEC_CODE)
701 
            r_symndx = ALPHA_RELOC_SECTION_TEXT;
702 
          else
703 
            r_symndx = ALPHA_RELOC_SECTION_DATA;
704 
        }
705 
      r_offset = 0;
706 
      r_size = 0;
707 
 
708 
      switch (r_type)
709 
        {
710 
        case ALPHA_R_LITUSE:
711 
        case ALPHA_R_GPDISP:
712 
          r_symndx = rel->addend;
713 
          break;
714 
 
715 
        case ALPHA_R_OP_STORE:
716 
          r_size = rel->addend & 0xff;
717 
          r_offset = (rel->addend >> 8) & 0xff;
718 
          break;
719 
 
720 
        case ALPHA_R_OP_PUSH:
721 
        case ALPHA_R_OP_PSUB:
722 
        case ALPHA_R_OP_PRSHIFT:
723 
          r_vaddr = rel->addend;
724 
          break;
725 
 
726 
        case ALPHA_R_IGNORE:
727 
          r_vaddr = rel->address;
728 
          break;
729 
 
730 
        default:
731 
          break;
732 
        }
733 
    }
734 
  else
735 
    {
736 
      /* r_type == ALPHA_R_NW_RELOC */
737 
      r_vaddr = rel->address;
738 
      if (rel->addend == 0)
739 
        {
740 
          r_symndx = 0;
741 
          r_size = ALPHA_R_NW_RELOC_SETGP;
742 
        }
743 
      else
744 
        {
745 
          r_symndx = rel->addend - 1;
746 
          r_size = ALPHA_R_NW_RELOC_LITA;
747 
        }
748 
      r_extern = 0;
749 
      r_offset = 0;
750 
    }
751 
 
752 
  /* Swap out the relocation fields.  */
753 
  bfd_h_put_64 (abfd, r_vaddr, (bfd_byte *) ext.r_vaddr);
754 
  bfd_h_put_32 (abfd, r_symndx, (bfd_byte *) ext.r_symndx);
755 
 
756 
  BFD_ASSERT (bfd_little_endian (abfd));
757 
 
758 
  ext.r_bits[0] = ((r_type << RELOC_BITS0_TYPE_SH_LITTLE)
759 
                   & RELOC_BITS0_TYPE_LITTLE);
760 
  ext.r_bits[1] = ((r_extern ? RELOC_BITS1_EXTERN_LITTLE : 0)
761 
                   | ((r_offset << RELOC_BITS1_OFFSET_SH_LITTLE)
762 
                      & RELOC_BITS1_OFFSET_LITTLE));
763 
  ext.r_bits[2] = 0;
764 
  ext.r_bits[3] = ((r_size << RELOC_BITS3_SIZE_SH_LITTLE)
765 
                   & RELOC_BITS3_SIZE_LITTLE);
766 
 
767 
  /* Write out the relocation.  */
768 
  if (bfd_write (&ext, sizeof ext, 1, abfd) != sizeof ext)
769 
    return false;
770 
 
771 
  return true;
772 
}
773 
 
774 
/* Alpha NetWare does not use the high bit to determine whether a
775 
   public symbol is in the code segment or the data segment.  Instead,
776 
   it just uses the address.  The set_public_section and
777 
   get_public_offset routines override the default code which uses the
778 
   high bit.  */
779 
 
780 
/* Set the section for a public symbol.  */
781 
 
782 
static boolean
783 
nlm_alpha_set_public_section (abfd, sym)
784 
     bfd *abfd;
785 
     nlmNAME(symbol_type) *sym;
786 
{
787 
  asection *code_sec, *data_sec;
788 
 
789 
  code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
790 
  data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
791 
  if (sym->symbol.value < bfd_section_size (abfd, code_sec))
792 
    {
793 
      sym->symbol.section = code_sec;
794 
      sym->symbol.flags |= BSF_FUNCTION;
795 
    }
796 
  else
797 
    {
798 
      sym->symbol.section = data_sec;
799 
      sym->symbol.value -= bfd_section_size (abfd, code_sec);
800 
      /* The data segment had better be aligned.  */
801 
      BFD_ASSERT ((bfd_section_size (abfd, code_sec) & 0xf) == 0);
802 
    }
803 
  return true;
804 
}
805 
 
806 
/* Get the offset to write out for a public symbol.  */
807 
 
808 
static bfd_vma
809 
nlm_alpha_get_public_offset (abfd, sym)
810 
     bfd *abfd;
811 
     asymbol *sym;
812 
{
813 
  return bfd_asymbol_value (sym);
814 
}
815 
 
816 
/* Write an Alpha NLM external symbol.  */
817 
 
818 
static boolean
819 
nlm_alpha_write_external (abfd, count, sym, relocs)
820 
     bfd *abfd;
821 
     bfd_size_type count;
822 
     asymbol *sym;
823 
     struct reloc_and_sec *relocs;
824 
{
825 
  int i;
826 
  bfd_byte len;
827 
  unsigned char temp[NLM_TARGET_LONG_SIZE];
828 
  arelent r;
829 
 
830 
  len = strlen (sym->name);
831 
  if ((bfd_write (&len, sizeof (bfd_byte), 1, abfd) != sizeof(bfd_byte))
832 
      || bfd_write (sym->name, len, 1, abfd) != len)
833 
    return false;
834 
 
835 
  bfd_put_32 (abfd, count + 2, temp);
836 
  if (bfd_write (temp, sizeof (temp), 1, abfd) != sizeof (temp))
837 
    return false;
838 
 
839 
  /* The first two relocs for each external symbol are the .lita
840 
     address and the GP value.  */
841 
  r.sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
842 
  r.howto = &nlm32_alpha_nw_howto;
843 
 
844 
  r.address = nlm_alpha_backend_data (abfd)->lita_address;
845 
  r.addend = nlm_alpha_backend_data (abfd)->lita_size + 1;
846 
  if (nlm_alpha_write_import (abfd, (asection *) NULL, &r) == false)
847 
    return false;
848 
 
849 
  r.address = nlm_alpha_backend_data (abfd)->gp;
850 
  r.addend = 0;
851 
  if (nlm_alpha_write_import (abfd, (asection *) NULL, &r) == false)
852 
    return false;
853 
 
854 
  for (i = 0; i < count; i++)
855 
    {
856 
      if (nlm_alpha_write_import (abfd, relocs[i].sec,
857 
                                  relocs[i].rel) == false)
858 
        return false;
859 
    }
860 
 
861 
  return true;
862 
}
863 
 
864 
#include "nlmswap.h"
865 
 
866 
static const struct nlm_backend_data nlm32_alpha_backend =
867 
{
868 
  "NetWare Alpha Module   \032",
869 
  sizeof (Nlm32_alpha_External_Fixed_Header),
870 
  sizeof (struct nlm32_alpha_external_prefix_header),
871 
  bfd_arch_alpha,
872 
  0,
873 
  true, /* no uninitialized data permitted by Alpha NetWare.  */
874 
  nlm_alpha_backend_object_p,
875 
  nlm_alpha_write_prefix,
876 
  nlm_alpha_read_reloc,
877 
  nlm_alpha_mangle_relocs,
878 
  nlm_alpha_read_import,
879 
  nlm_alpha_write_import,
880 
  nlm_alpha_set_public_section,
881 
  nlm_alpha_get_public_offset,
882 
  nlm_swap_fixed_header_in,
883 
  nlm_swap_fixed_header_out,
884 
  nlm_alpha_write_external,
885 
  0,     /* write_export */
886 
};
887 
 
888 
#define TARGET_LITTLE_NAME              "nlm32-alpha"
889 
#define TARGET_LITTLE_SYM               nlmNAME(alpha_vec)
890 
#define TARGET_BACKEND_DATA             &nlm32_alpha_backend
891 
 
892 
#include "nlm-target.h"

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