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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [bfd/] [nlm32-alpha.c] - Blame information for rev 816

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1 24 jeremybenn 
/* Support for 32-bit Alpha NLM (NetWare Loadable Module)
2 
   Copyright 1993, 1994, 2000, 2001, 2002, 2003, 2004, 2005, 2007
3 
   Free Software Foundation, Inc.
4 
   Written by Ian Lance Taylor, Cygnus Support.
5 
 
6 
   This file is part of BFD, the Binary File Descriptor library.
7 
 
8 
   This program is free software; you can redistribute it and/or modify
9 
   it under the terms of the GNU General Public License as published by
10 
   the Free Software Foundation; either version 3 of the License, or
11 
   (at your option) any later version.
12 
 
13 
   This program is distributed in the hope that it will be useful,
14 
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 
   GNU General Public License for more details.
17 
 
18 
   You should have received a copy of the GNU General Public License
19 
   along with this program; if not, write to the Free Software
20 
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 
   MA 02110-1301, USA.  */
22 
 
23 
 
24 
/* This file describes the 32 bit Alpha NLM format.  You might think
25 
   that an Alpha chip would use a 64 bit format, but, for some reason,
26 
   it doesn't.  */
27 
 
28 
#include "sysdep.h"
29 
#include "bfd.h"
30 
#include "libbfd.h"
31 
 
32 
#define ARCH_SIZE 32
33 
 
34 
#include "nlm/alpha-ext.h"
35 
#define Nlm_External_Fixed_Header       Nlm32_alpha_External_Fixed_Header
36 
 
37 
#include "libnlm.h"
38 
 
39 
/* Alpha NLM's have a prefix header before the standard NLM.  This
40 
   function reads it in, verifies the version, and seeks the bfd to
41 
   the location before the regular NLM header.  */
42 
 
43 
static bfd_boolean
44 
nlm_alpha_backend_object_p (bfd *abfd)
45 
{
46 
  struct nlm32_alpha_external_prefix_header s;
47 
  file_ptr size;
48 
 
49 
  if (bfd_bread (&s, (bfd_size_type) sizeof s, abfd) != sizeof s)
50 
    return FALSE;
51 
 
52 
  if (H_GET_32 (abfd, s.magic) != NLM32_ALPHA_MAGIC)
53 
    return FALSE;
54 
 
55 
  /* FIXME: Should we check the format number?  */
56 
 
57 
  /* Skip to the end of the header.  */
58 
  size = H_GET_32 (abfd, s.size);
59 
  if (bfd_seek (abfd, size, SEEK_SET) != 0)
60 
    return FALSE;
61 
 
62 
  return TRUE;
63 
}
64 
 
65 
/* Write out the prefix.  */
66 
 
67 
static bfd_boolean
68 
nlm_alpha_write_prefix (bfd *abfd)
69 
{
70 
  struct nlm32_alpha_external_prefix_header s;
71 
 
72 
  memset (&s, 0, sizeof s);
73 
  H_PUT_32 (abfd, NLM32_ALPHA_MAGIC, s.magic);
74 
  H_PUT_32 (abfd, 2, s.format);
75 
  H_PUT_32 (abfd, sizeof s, s.size);
76 
  if (bfd_bwrite (&s, (bfd_size_type) sizeof s, abfd) != sizeof s)
77 
    return FALSE;
78 
  return TRUE;
79 
}
80 
 
81 
#define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1)
82 
 
83 
/* How to process the various reloc types.  */
84 
 
85 
static reloc_howto_type nlm32_alpha_howto_table[] =
86 
{
87 
  /* Reloc type 0 is ignored by itself.  However, it appears after a
88 
     GPDISP reloc to identify the location where the low order 16 bits
89 
     of the gp register are loaded.  */
90 
  HOWTO (ALPHA_R_IGNORE,        /* Type.  */
91 
         0,                      /* Rightshift.  */
92 
         0,                      /* Size (0 = byte, 1 = short, 2 = long).  */
93 
         8,                     /* Bitsize.  */
94 
         FALSE,                 /* PC_relative.  */
95 
         0,                      /* Bitpos.  */
96 
         complain_overflow_dont, /* Complain_on_overflow.  */
97 
         0,                      /* Special_function.  */
98 
         "IGNORE",              /* Name.  */
99 
         FALSE,                 /* Partial_inplace.  */
100 
         0,                      /* Source mask.  */
101 
         0,                      /* Dest mask.  */
102 
         FALSE),                /* PCrel_offset.  */
103 
 
104 
  /* A 32 bit reference to a symbol.  */
105 
  HOWTO (ALPHA_R_REFLONG,       /* Type.  */
106 
         0,                      /* Rightshift.  */
107 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
108 
         32,                    /* Bitsize.  */
109 
         FALSE,                 /* PC_relative.  */
110 
         0,                      /* Bitpos.  */
111 
         complain_overflow_bitfield, /* Complain_on_overflow.  */
112 
         0,                      /* Special_function.  */
113 
         "REFLONG",             /* Name.  */
114 
         TRUE,                  /* Partial_inplace.  */
115 
         0xffffffff,            /* Source mask.  */
116 
         0xffffffff,            /* Dest mask.  */
117 
         FALSE),                /* PCrel_offset.  */
118 
 
119 
  /* A 64 bit reference to a symbol.  */
120 
  HOWTO (ALPHA_R_REFQUAD,       /* Type.  */
121 
         0,                      /* Rightshift.  */
122 
         4,                     /* Size (0 = byte, 1 = short, 2 = long).  */
123 
         64,                    /* Bitsize.  */
124 
         FALSE,                 /* PC_relative.  */
125 
         0,                      /* Bitpos.  */
126 
         complain_overflow_bitfield, /* Complain_on_overflow.  */
127 
         0,                      /* Special_function.  */
128 
         "REFQUAD",             /* Name.  */
129 
         TRUE,                  /* Partial_inplace.  */
130 
         ONES (64),             /* Source mask.  */
131 
         ONES (64),             /* Dest mask.  */
132 
         FALSE),                /* PCrel_offset.  */
133 
 
134 
  /* A 32 bit GP relative offset.  This is just like REFLONG except
135 
     that when the value is used the value of the gp register will be
136 
     added in.  */
137 
  HOWTO (ALPHA_R_GPREL32,       /* Type.  */
138 
         0,                      /* Rightshift.  */
139 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
140 
         32,                    /* Bitsize.  */
141 
         FALSE,                 /* PC_relative.  */
142 
         0,                      /* Bitpos.  */
143 
         complain_overflow_bitfield, /* Complain_on_overflow.  */
144 
         0,                      /* Special_function.  */
145 
         "GPREL32",             /* Name.  */
146 
         TRUE,                  /* Partial_inplace.  */
147 
         0xffffffff,            /* Source mask.  */
148 
         0xffffffff,            /* Dest mask.  */
149 
         FALSE),                /* PCrel_offset.  */
150 
 
151 
  /* Used for an instruction that refers to memory off the GP
152 
     register.  The offset is 16 bits of the 32 bit instruction.  This
153 
     reloc always seems to be against the .lita section.  */
154 
  HOWTO (ALPHA_R_LITERAL,       /* Type.  */
155 
         0,                      /* Rightshift.  */
156 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
157 
         16,                    /* Bitsize.  */
158 
         FALSE,                 /* PC_relative.  */
159 
         0,                      /* Bitpos.  */
160 
         complain_overflow_signed, /* Complain_on_overflow.  */
161 
         0,                      /* Special_function.  */
162 
         "LITERAL",             /* Name.  */
163 
         TRUE,                  /* Partial_inplace.  */
164 
         0xffff,                /* Source mask.  */
165 
         0xffff,                /* Dest mask.  */
166 
         FALSE),                /* PCrel_offset.  */
167 
 
168 
  /* This reloc only appears immediately following a LITERAL reloc.
169 
     It identifies a use of the literal.  It seems that the linker can
170 
     use this to eliminate a portion of the .lita section.  The symbol
171 
     index is special: 1 means the literal address is in the base
172 
     register of a memory format instruction; 2 means the literal
173 
     address is in the byte offset register of a byte-manipulation
174 
     instruction; 3 means the literal address is in the target
175 
     register of a jsr instruction.  This does not actually do any
176 
     relocation.  */
177 
  HOWTO (ALPHA_R_LITUSE,        /* Type.  */
178 
         0,                      /* Rightshift.  */
179 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
180 
         32,                    /* Bitsize.  */
181 
         FALSE,                 /* PC_relative.  */
182 
         0,                      /* Bitpos.  */
183 
         complain_overflow_dont, /* Complain_on_overflow.  */
184 
         0,                      /* Special_function.  */
185 
         "LITUSE",              /* Name.  */
186 
         FALSE,                 /* Partial_inplace.  */
187 
         0,                      /* Source mask.  */
188 
         0,                      /* Dest mask.  */
189 
         FALSE),                /* PCrel_offset.  */
190 
 
191 
  /* Load the gp register.  This is always used for a ldah instruction
192 
     which loads the upper 16 bits of the gp register.  The next reloc
193 
     will be an IGNORE reloc which identifies the location of the lda
194 
     instruction which loads the lower 16 bits.  The symbol index of
195 
     the GPDISP instruction appears to actually be the number of bytes
196 
     between the ldah and lda instructions.  This gives two different
197 
     ways to determine where the lda instruction is; I don't know why
198 
     both are used.  The value to use for the relocation is the
199 
     difference between the GP value and the current location; the
200 
     load will always be done against a register holding the current
201 
     address.  */
202 
  HOWTO (ALPHA_R_GPDISP,        /* Type.  */
203 
         16,                    /* Rightshift.  */
204 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
205 
         16,                    /* Bitsize.  */
206 
         TRUE,                  /* PC_relative.  */
207 
         0,                      /* Bitpos.  */
208 
         complain_overflow_dont, /* Complain_on_overflow.  */
209 
         0,                      /* Special_function.  */
210 
         "GPDISP",              /* Name.  */
211 
         TRUE,                  /* Partial_inplace.  */
212 
         0xffff,                /* Source mask.  */
213 
         0xffff,                /* Dest mask.  */
214 
         TRUE),                 /* PCrel_offset.  */
215 
 
216 
  /* A 21 bit branch.  The native assembler generates these for
217 
     branches within the text segment, and also fills in the PC
218 
     relative offset in the instruction.  It seems to me that this
219 
     reloc, unlike the others, is not partial_inplace.  */
220 
  HOWTO (ALPHA_R_BRADDR,        /* Type.  */
221 
         2,                     /* Rightshift.  */
222 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
223 
         21,                    /* Bitsize.  */
224 
         TRUE,                  /* PC_relative.  */
225 
         0,                      /* Bitpos.  */
226 
         complain_overflow_signed, /* Complain_on_overflow.  */
227 
         0,                      /* Special_function.  */
228 
         "BRADDR",              /* Name.  */
229 
         FALSE,                 /* Partial_inplace.  */
230 
         0,                      /* Source mask.  */
231 
         0x1fffff,              /* Dest mask.  */
232 
         FALSE),                /* PCrel_offset.  */
233 
 
234 
  /* A hint for a jump to a register.  */
235 
  HOWTO (ALPHA_R_HINT,          /* Type.  */
236 
         2,                     /* Rightshift.  */
237 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
238 
         14,                    /* Bitsize.  */
239 
         FALSE,                 /* PC_relative.  */
240 
         0,                      /* Bitpos.  */
241 
         complain_overflow_dont, /* Complain_on_overflow.  */
242 
         0,                      /* Special_function.  */
243 
         "HINT",                /* Name.  */
244 
         TRUE,                  /* Partial_inplace.  */
245 
         0x3fff,                /* Source mask.  */
246 
         0x3fff,                /* Dest mask.  */
247 
         FALSE),                /* PCrel_offset.  */
248 
 
249 
  /* 16 bit PC relative offset.  */
250 
  HOWTO (ALPHA_R_SREL16,        /* Type.  */
251 
         0,                      /* Rightshift.  */
252 
         1,                     /* Size (0 = byte, 1 = short, 2 = long).  */
253 
         16,                    /* Bitsize.  */
254 
         TRUE,                  /* PC_relative.  */
255 
         0,                      /* Bitpos.  */
256 
         complain_overflow_signed, /* Complain_on_overflow.  */
257 
         0,                      /* Special_function.  */
258 
         "SREL16",              /* Name.  */
259 
         TRUE,                  /* Partial_inplace.  */
260 
         0xffff,                /* Source mask.  */
261 
         0xffff,                /* Dest mask.  */
262 
         FALSE),                /* PCrel_offset.  */
263 
 
264 
  /* 32 bit PC relative offset.  */
265 
  HOWTO (ALPHA_R_SREL32,        /* Type.  */
266 
         0,                      /* Rightshift.  */
267 
         2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
268 
         32,                    /* Bitsize.  */
269 
         TRUE,                  /* PC_relative.  */
270 
         0,                      /* Bitpos.  */
271 
         complain_overflow_signed, /* Complain_on_overflow.  */
272 
         0,                      /* Special_function.  */
273 
         "SREL32",              /* Name.  */
274 
         TRUE,                  /* Partial_inplace.  */
275 
         0xffffffff,            /* Source mask.  */
276 
         0xffffffff,            /* Dest mask.  */
277 
         FALSE),                /* PCrel_offset.  */
278 
 
279 
  /* A 64 bit PC relative offset.  */
280 
  HOWTO (ALPHA_R_SREL64,        /* Type.  */
281 
         0,                      /* Rightshift.  */
282 
         4,                     /* Size (0 = byte, 1 = short, 2 = long).  */
283 
         64,                    /* Bitsize.  */
284 
         TRUE,                  /* PC_relative.  */
285 
         0,                      /* Bitpos.  */
286 
         complain_overflow_signed, /* Complain_on_overflow.  */
287 
         0,                      /* Special_function.  */
288 
         "SREL64",              /* Name.  */
289 
         TRUE,                  /* Partial_inplace.  */
290 
         ONES (64),             /* Source mask.  */
291 
         ONES (64),             /* Dest mask.  */
292 
         FALSE),                /* PCrel_offset.  */
293 
 
294 
  /* Push a value on the reloc evaluation stack.  */
295 
  HOWTO (ALPHA_R_OP_PUSH,       /* Type.  */
296 
         0,                      /* Rightshift.  */
297 
         0,                      /* Size (0 = byte, 1 = short, 2 = long).  */
298 
         0,                      /* Bitsize.  */
299 
         FALSE,                 /* PC_relative.  */
300 
         0,                      /* Bitpos.  */
301 
         complain_overflow_dont, /* Complain_on_overflow.  */
302 
         0,                      /* Special_function.  */
303 
         "OP_PUSH",             /* Name.  */
304 
         FALSE,                 /* Partial_inplace.  */
305 
         0,                      /* Source mask.  */
306 
         0,                      /* Dest mask.  */
307 
         FALSE),                /* PCrel_offset.  */
308 
 
309 
  /* Store the value from the stack at the given address.  Store it in
310 
     a bitfield of size r_size starting at bit position r_offset.  */
311 
  HOWTO (ALPHA_R_OP_STORE,      /* Type.  */
312 
         0,                      /* Rightshift.  */
313 
         4,                     /* Size (0 = byte, 1 = short, 2 = long).  */
314 
         64,                    /* Bitsize.  */
315 
         FALSE,                 /* PC_relative.  */
316 
         0,                      /* Bitpos.  */
317 
         complain_overflow_dont, /* Complain_on_overflow.  */
318 
         0,                      /* Special_function.  */
319 
         "OP_STORE",            /* Name.  */
320 
         FALSE,                 /* Partial_inplace.  */
321 
         0,                      /* Source mask.  */
322 
         ONES (64),             /* Dest mask.  */
323 
         FALSE),                /* PCrel_offset.  */
324 
 
325 
  /* Subtract the reloc address from the value on the top of the
326 
     relocation stack.  */
327 
  HOWTO (ALPHA_R_OP_PSUB,       /* Type.  */
328 
         0,                      /* Rightshift.  */
329 
         0,                      /* Size (0 = byte, 1 = short, 2 = long).  */
330 
         0,                      /* Bitsize.  */
331 
         FALSE,                 /* PC_relative.  */
332 
         0,                      /* Bitpos.  */
333 
         complain_overflow_dont, /* Complain_on_overflow.  */
334 
         0,                      /* Special_function.  */
335 
         "OP_PSUB",             /* Name.  */
336 
         FALSE,                 /* Partial_inplace.  */
337 
         0,                      /* Source mask.  */
338 
         0,                      /* Dest mask.  */
339 
         FALSE),                /* PCrel_offset.  */
340 
 
341 
  /* Shift the value on the top of the relocation stack right by the
342 
     given value.  */
343 
  HOWTO (ALPHA_R_OP_PRSHIFT,    /* 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_PRSHIFT",          /* Name.  */
352 
         FALSE,                 /* Partial_inplace.  */
353 
         0,                      /* Source mask.  */
354 
         0,                      /* Dest mask.  */
355 
         FALSE),                /* PCrel_offset.  */
356 
 
357 
  /* Adjust the GP value for a new range in the object file.  */
358 
  HOWTO (ALPHA_R_GPVALUE,       /* Type.  */
359 
         0,                      /* Rightshift.  */
360 
         0,                      /* Size (0 = byte, 1 = short, 2 = long).  */
361 
         0,                      /* Bitsize.  */
362 
         FALSE,                 /* PC_relative.  */
363 
         0,                      /* Bitpos.  */
364 
         complain_overflow_dont, /* Complain_on_overflow.  */
365 
         0,                      /* Special_function.  */
366 
         "GPVALUE",             /* Name.  */
367 
         FALSE,                 /* Partial_inplace.  */
368 
         0,                      /* Source mask.  */
369 
         0,                      /* Dest mask.  */
370 
         FALSE)                 /* PCrel_offset.  */
371 
};
372 
 
373 
static reloc_howto_type nlm32_alpha_nw_howto =
374 
  HOWTO (ALPHA_R_NW_RELOC,      /* 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 
         "NW_RELOC",            /* Name.  */
383 
         FALSE,                 /* Partial_inplace.  */
384 
         0,                      /* Source mask.  */
385 
         0,                      /* Dest mask.  */
386 
         FALSE);                /* PCrel_offset.  */
387 
 
388 
/* Read an Alpha NLM reloc.  This routine keeps some static data which
389 
   it uses when handling local relocs.  This only works correctly
390 
   because all the local relocs are read at once.  */
391 
 
392 
static bfd_boolean
393 
nlm_alpha_read_reloc (bfd *abfd,
394 
                      nlmNAME (symbol_type) *sym,
395 
                      asection **secp,
396 
                      arelent *rel)
397 
{
398 
  static bfd_vma gp_value;
399 
  static bfd_vma lita_address;
400 
  struct nlm32_alpha_external_reloc ext;
401 
  bfd_vma r_vaddr;
402 
  long r_symndx;
403 
  int r_type, r_extern, r_offset, r_size;
404 
  asection *code_sec, *data_sec;
405 
 
406 
  /* Read the reloc from the file.  */
407 
  if (bfd_bread (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext)
408 
    return FALSE;
409 
 
410 
  /* Swap in the reloc information.  */
411 
  r_vaddr = H_GET_64 (abfd, ext.r_vaddr);
412 
  r_symndx = H_GET_32 (abfd, ext.r_symndx);
413 
 
414 
  BFD_ASSERT (bfd_little_endian (abfd));
415 
 
416 
  r_type = ((ext.r_bits[0] & RELOC_BITS0_TYPE_LITTLE)
417 
            >> RELOC_BITS0_TYPE_SH_LITTLE);
418 
  r_extern = (ext.r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0;
419 
  r_offset = ((ext.r_bits[1] & RELOC_BITS1_OFFSET_LITTLE)
420 
              >> RELOC_BITS1_OFFSET_SH_LITTLE);
421 
  /* Ignore the reserved bits.  */
422 
  r_size = ((ext.r_bits[3] & RELOC_BITS3_SIZE_LITTLE)
423 
            >> RELOC_BITS3_SIZE_SH_LITTLE);
424 
 
425 
  /* Fill in the BFD arelent structure.  */
426 
  code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
427 
  data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
428 
  if (r_extern)
429 
    {
430 
      /* External relocations are only used for imports.  */
431 
      BFD_ASSERT (sym != NULL);
432 
      /* We don't need to set sym_ptr_ptr for this case.  It is set in
433 
         nlm_canonicalize_reloc.  */
434 
      rel->sym_ptr_ptr = NULL;
435 
      rel->addend = 0;
436 
    }
437 
  else
438 
    {
439 
      /* Internal relocations are only used for local relocation
440 
         fixups.  If they are not NW_RELOC or GPDISP or IGNORE, they
441 
         must be against .text or .data.  */
442 
      BFD_ASSERT (r_type == ALPHA_R_NW_RELOC || sym == NULL);
443 
      if (r_type == ALPHA_R_NW_RELOC
444 
          || r_type == ALPHA_R_GPDISP
445 
          || r_type == ALPHA_R_IGNORE)
446 
        {
447 
          rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
448 
          rel->addend = 0;
449 
        }
450 
      else if (r_symndx == ALPHA_RELOC_SECTION_TEXT)
451 
        {
452 
          rel->sym_ptr_ptr = code_sec->symbol_ptr_ptr;
453 
          BFD_ASSERT (bfd_get_section_vma (abfd, code_sec) == 0);
454 
          rel->addend = 0;
455 
        }
456 
      else if (r_symndx == ALPHA_RELOC_SECTION_DATA)
457 
        {
458 
          rel->sym_ptr_ptr = data_sec->symbol_ptr_ptr;
459 
          rel->addend = - bfd_get_section_vma (abfd, data_sec);
460 
        }
461 
      else
462 
        {
463 
          BFD_ASSERT (0);
464 
          rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
465 
          rel->addend = 0;
466 
        }
467 
    }
468 
 
469 
  /* We use the address to determine whether the reloc is in the .text
470 
     or .data section.  R_NW_RELOC relocs don't really have a section,
471 
     so we put them in .text.  */
472 
  if (r_type == ALPHA_R_NW_RELOC
473 
      || r_vaddr < code_sec->size)
474 
    {
475 
      *secp = code_sec;
476 
      rel->address = r_vaddr;
477 
    }
478 
  else
479 
    {
480 
      *secp = data_sec;
481 
      rel->address = r_vaddr - code_sec->size;
482 
    }
483 
 
484 
  /* We must adjust the addend based on the type.  */
485 
  BFD_ASSERT ((r_type >= 0 && r_type <= ALPHA_R_GPVALUE)
486 
              || r_type == ALPHA_R_NW_RELOC);
487 
 
488 
  switch (r_type)
489 
    {
490 
    case ALPHA_R_BRADDR:
491 
    case ALPHA_R_SREL16:
492 
    case ALPHA_R_SREL32:
493 
    case ALPHA_R_SREL64:
494 
      /* The PC relative relocs do not seem to use the section VMA as
495 
         a negative addend.  */
496 
      rel->addend = 0;
497 
      break;
498 
 
499 
    case ALPHA_R_GPREL32:
500 
      /* Copy the gp value for this object file into the addend, to
501 
         ensure that we are not confused by the linker.  */
502 
      if (! r_extern)
503 
        rel->addend += gp_value;
504 
      break;
505 
 
506 
    case ALPHA_R_LITERAL:
507 
      BFD_ASSERT (! r_extern);
508 
      rel->addend += lita_address;
509 
      break;
510 
 
511 
    case ALPHA_R_LITUSE:
512 
    case ALPHA_R_GPDISP:
513 
      /* The LITUSE and GPDISP relocs do not use a symbol, or an
514 
         addend, but they do use a special code.  Put this code in the
515 
         addend field.  */
516 
      rel->addend = r_symndx;
517 
      rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
518 
      break;
519 
 
520 
    case ALPHA_R_OP_STORE:
521 
      /* The STORE reloc needs the size and offset fields.  We store
522 
         them in the addend.  */
523 
      BFD_ASSERT (r_offset < 256 && r_size < 256);
524 
      rel->addend = (r_offset << 8) + r_size;
525 
      break;
526 
 
527 
    case ALPHA_R_OP_PUSH:
528 
    case ALPHA_R_OP_PSUB:
529 
    case ALPHA_R_OP_PRSHIFT:
530 
      /* The PUSH, PSUB and PRSHIFT relocs do not actually use an
531 
         address.  I believe that the address supplied is really an
532 
         addend.  */
533 
      rel->addend = r_vaddr;
534 
      break;
535 
 
536 
    case ALPHA_R_GPVALUE:
537 
      /* Record the new gp value.  */
538 
      gp_value += r_symndx;
539 
      rel->addend = gp_value;
540 
      break;
541 
 
542 
    case ALPHA_R_IGNORE:
543 
      /* If the type is ALPHA_R_IGNORE, make sure this is a reference
544 
         to the absolute section so that the reloc is ignored.  For
545 
         some reason the address of this reloc type is not adjusted by
546 
         the section vma.  We record the gp value for this object file
547 
         here, for convenience when doing the GPDISP relocation.  */
548 
      rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
549 
      rel->address = r_vaddr;
550 
      rel->addend = gp_value;
551 
      break;
552 
 
553 
    case ALPHA_R_NW_RELOC:
554 
      /* If this is SETGP, we set the addend to 0.  Otherwise we set
555 
         the addend to the size of the .lita section (this is
556 
         r_symndx) plus 1.  We have already set the address of the
557 
         reloc to r_vaddr.  */
558 
      if (r_size == ALPHA_R_NW_RELOC_SETGP)
559 
        {
560 
          gp_value = r_vaddr;
561 
          rel->addend = 0;
562 
        }
563 
      else if (r_size == ALPHA_R_NW_RELOC_LITA)
564 
        {
565 
          lita_address = r_vaddr;
566 
          rel->addend = r_symndx + 1;
567 
        }
568 
      else
569 
        BFD_ASSERT (0);
570 
      rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
571 
      break;
572 
 
573 
    default:
574 
      break;
575 
    }
576 
 
577 
  if (r_type == ALPHA_R_NW_RELOC)
578 
    rel->howto = &nlm32_alpha_nw_howto;
579 
  else
580 
    rel->howto = &nlm32_alpha_howto_table[r_type];
581 
 
582 
  return TRUE;
583 
}
584 
 
585 
/* Mangle Alpha NLM relocs for output.  */
586 
 
587 
static bfd_boolean
588 
nlm_alpha_mangle_relocs (bfd *abfd ATTRIBUTE_UNUSED,
589 
                         asection *sec ATTRIBUTE_UNUSED,
590 
                         const void * data ATTRIBUTE_UNUSED,
591 
                         bfd_vma offset ATTRIBUTE_UNUSED,
592 
                         bfd_size_type count ATTRIBUTE_UNUSED)
593 
{
594 
  return TRUE;
595 
}
596 
 
597 
/* Read an ALPHA NLM import record.  */
598 
 
599 
static bfd_boolean
600 
nlm_alpha_read_import (bfd *abfd, nlmNAME (symbol_type) * sym)
601 
{
602 
  struct nlm_relent *nlm_relocs;        /* Relocation records for symbol.  */
603 
  bfd_size_type rcount;                 /* Number of relocs.  */
604 
  bfd_byte temp[NLM_TARGET_LONG_SIZE];  /* Temporary 32-bit value.  */
605 
  unsigned char symlength;              /* Length of symbol name.  */
606 
  char *name;
607 
  bfd_size_type amt;
608 
 
609 
  if (bfd_bread (& symlength, (bfd_size_type) sizeof (symlength), abfd)
610 
      != sizeof (symlength))
611 
    return FALSE;
612 
  sym -> symbol.the_bfd = abfd;
613 
  name = bfd_alloc (abfd, (bfd_size_type) symlength + 1);
614 
  if (name == NULL)
615 
    return FALSE;
616 
  if (bfd_bread (name, (bfd_size_type) symlength, abfd) != symlength)
617 
    return FALSE;
618 
  name[symlength] = '\0';
619 
  sym -> symbol.name = name;
620 
  sym -> symbol.flags = 0;
621 
  sym -> symbol.value = 0;
622 
  sym -> symbol.section = bfd_und_section_ptr;
623 
  if (bfd_bread (temp, (bfd_size_type) sizeof (temp), abfd)
624 
      != sizeof (temp))
625 
    return FALSE;
626 
  rcount = H_GET_32 (abfd, temp);
627 
  amt = rcount * sizeof (struct nlm_relent);
628 
  nlm_relocs = bfd_alloc (abfd, amt);
629 
  if (!nlm_relocs)
630 
    return FALSE;
631 
  sym -> relocs = nlm_relocs;
632 
  sym -> rcnt = 0;
633 
  while (sym -> rcnt < rcount)
634 
    {
635 
      asection *section;
636 
 
637 
      if (! nlm_alpha_read_reloc (abfd, sym, &section, &nlm_relocs -> reloc))
638 
        return FALSE;
639 
      nlm_relocs -> section = section;
640 
      nlm_relocs++;
641 
      sym -> rcnt++;
642 
    }
643 
 
644 
  return TRUE;
645 
}
646 
 
647 
/* Write an Alpha NLM reloc.  */
648 
 
649 
static bfd_boolean
650 
nlm_alpha_write_import (bfd * abfd, asection * sec, arelent * rel)
651 
{
652 
  asymbol *sym;
653 
  bfd_vma r_vaddr;
654 
  long r_symndx;
655 
  int r_type, r_extern, r_offset, r_size;
656 
  struct nlm32_alpha_external_reloc ext;
657 
 
658 
  sym = *rel->sym_ptr_ptr;
659 
 
660 
  /* Get values for the relocation fields.  */
661 
  r_type = rel->howto->type;
662 
  if (r_type != ALPHA_R_NW_RELOC)
663 
    {
664 
      r_vaddr = bfd_get_section_vma (abfd, sec) + rel->address;
665 
      if ((sec->flags & SEC_CODE) == 0)
666 
        r_vaddr += bfd_get_section_by_name (abfd, NLM_CODE_NAME) -> size;
667 
      if (bfd_is_und_section (bfd_get_section (sym)))
668 
        {
669 
          r_extern = 1;
670 
          r_symndx = 0;
671 
        }
672 
      else
673 
        {
674 
          r_extern = 0;
675 
          if (bfd_get_section_flags (abfd, bfd_get_section (sym)) & SEC_CODE)
676 
            r_symndx = ALPHA_RELOC_SECTION_TEXT;
677 
          else
678 
            r_symndx = ALPHA_RELOC_SECTION_DATA;
679 
        }
680 
      r_offset = 0;
681 
      r_size = 0;
682 
 
683 
      switch (r_type)
684 
        {
685 
        case ALPHA_R_LITUSE:
686 
        case ALPHA_R_GPDISP:
687 
          r_symndx = rel->addend;
688 
          break;
689 
 
690 
        case ALPHA_R_OP_STORE:
691 
          r_size = rel->addend & 0xff;
692 
          r_offset = (rel->addend >> 8) & 0xff;
693 
          break;
694 
 
695 
        case ALPHA_R_OP_PUSH:
696 
        case ALPHA_R_OP_PSUB:
697 
        case ALPHA_R_OP_PRSHIFT:
698 
          r_vaddr = rel->addend;
699 
          break;
700 
 
701 
        case ALPHA_R_IGNORE:
702 
          r_vaddr = rel->address;
703 
          break;
704 
 
705 
        default:
706 
          break;
707 
        }
708 
    }
709 
  else
710 
    {
711 
      /* r_type == ALPHA_R_NW_RELOC.  */
712 
      r_vaddr = rel->address;
713 
      if (rel->addend == 0)
714 
        {
715 
          r_symndx = 0;
716 
          r_size = ALPHA_R_NW_RELOC_SETGP;
717 
        }
718 
      else
719 
        {
720 
          r_symndx = rel->addend - 1;
721 
          r_size = ALPHA_R_NW_RELOC_LITA;
722 
        }
723 
      r_extern = 0;
724 
      r_offset = 0;
725 
    }
726 
 
727 
  /* Swap out the relocation fields.  */
728 
  H_PUT_64 (abfd, r_vaddr, ext.r_vaddr);
729 
  H_PUT_32 (abfd, r_symndx, ext.r_symndx);
730 
 
731 
  BFD_ASSERT (bfd_little_endian (abfd));
732 
 
733 
  ext.r_bits[0] = ((r_type << RELOC_BITS0_TYPE_SH_LITTLE)
734 
                   & RELOC_BITS0_TYPE_LITTLE);
735 
  ext.r_bits[1] = ((r_extern ? RELOC_BITS1_EXTERN_LITTLE : 0)
736 
                   | ((r_offset << RELOC_BITS1_OFFSET_SH_LITTLE)
737 
                      & RELOC_BITS1_OFFSET_LITTLE));
738 
  ext.r_bits[2] = 0;
739 
  ext.r_bits[3] = ((r_size << RELOC_BITS3_SIZE_SH_LITTLE)
740 
                   & RELOC_BITS3_SIZE_LITTLE);
741 
 
742 
  /* Write out the relocation.  */
743 
  if (bfd_bwrite (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext)
744 
    return FALSE;
745 
 
746 
  return TRUE;
747 
}
748 
 
749 
/* Alpha NetWare does not use the high bit to determine whether a
750 
   public symbol is in the code segment or the data segment.  Instead,
751 
   it just uses the address.  The set_public_section and
752 
   get_public_offset routines override the default code which uses the
753 
   high bit.  */
754 
 
755 
/* Set the section for a public symbol.  */
756 
 
757 
static bfd_boolean
758 
nlm_alpha_set_public_section (bfd * abfd, nlmNAME (symbol_type) * sym)
759 
{
760 
  asection *code_sec, *data_sec;
761 
 
762 
  code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
763 
  data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
764 
  if (sym->symbol.value < code_sec->size)
765 
    {
766 
      sym->symbol.section = code_sec;
767 
      sym->symbol.flags |= BSF_FUNCTION;
768 
    }
769 
  else
770 
    {
771 
      sym->symbol.section = data_sec;
772 
      sym->symbol.value -= code_sec->size;
773 
      /* The data segment had better be aligned.  */
774 
      BFD_ASSERT ((code_sec->size & 0xf) == 0);
775 
    }
776 
  return TRUE;
777 
}
778 
 
779 
/* Get the offset to write out for a public symbol.  */
780 
 
781 
static bfd_vma
782 
nlm_alpha_get_public_offset (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym)
783 
{
784 
  return bfd_asymbol_value (sym);
785 
}
786 
 
787 
/* Write an Alpha NLM external symbol.  */
788 
 
789 
static bfd_boolean
790 
nlm_alpha_write_external (bfd *abfd,
791 
                          bfd_size_type count,
792 
                          asymbol *sym,
793 
                          struct reloc_and_sec *relocs)
794 
{
795 
  bfd_size_type i;
796 
  bfd_byte len;
797 
  unsigned char temp[NLM_TARGET_LONG_SIZE];
798 
  arelent r;
799 
 
800 
  len = strlen (sym->name);
801 
  if ((bfd_bwrite (&len, (bfd_size_type) sizeof (bfd_byte), abfd)
802 
       != sizeof (bfd_byte))
803 
      || bfd_bwrite (sym->name, (bfd_size_type) len, abfd) != len)
804 
    return FALSE;
805 
 
806 
  bfd_put_32 (abfd, count + 2, temp);
807 
  if (bfd_bwrite (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp))
808 
    return FALSE;
809 
 
810 
  /* The first two relocs for each external symbol are the .lita
811 
     address and the GP value.  */
812 
  r.sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
813 
  r.howto = &nlm32_alpha_nw_howto;
814 
 
815 
  r.address = nlm_alpha_backend_data (abfd)->lita_address;
816 
  r.addend = nlm_alpha_backend_data (abfd)->lita_size + 1;
817 
  if (! nlm_alpha_write_import (abfd, NULL, &r))
818 
    return FALSE;
819 
 
820 
  r.address = nlm_alpha_backend_data (abfd)->gp;
821 
  r.addend = 0;
822 
  if (! nlm_alpha_write_import (abfd, NULL, &r))
823 
    return FALSE;
824 
 
825 
  for (i = 0; i < count; i++)
826 
    if (! nlm_alpha_write_import (abfd, relocs[i].sec, relocs[i].rel))
827 
      return FALSE;
828 
 
829 
  return TRUE;
830 
}
831 
 
832 
#include "nlmswap.h"
833 
 
834 
static const struct nlm_backend_data nlm32_alpha_backend =
835 
{
836 
  "NetWare Alpha Module   \032",
837 
  sizeof (Nlm32_alpha_External_Fixed_Header),
838 
  sizeof (struct nlm32_alpha_external_prefix_header),
839 
  bfd_arch_alpha,
840 
  0,
841 
  TRUE, /* No uninitialized data permitted by Alpha NetWare.  */
842 
  nlm_alpha_backend_object_p,
843 
  nlm_alpha_write_prefix,
844 
  nlm_alpha_read_reloc,
845 
  nlm_alpha_mangle_relocs,
846 
  nlm_alpha_read_import,
847 
  nlm_alpha_write_import,
848 
  nlm_alpha_set_public_section,
849 
  nlm_alpha_get_public_offset,
850 
  nlm_swap_fixed_header_in,
851 
  nlm_swap_fixed_header_out,
852 
  nlm_alpha_write_external,
853 
  0,     /* Write_export.  */
854 
};
855 
 
856 
#define TARGET_LITTLE_NAME              "nlm32-alpha"
857 
#define TARGET_LITTLE_SYM               nlmNAME (alpha_vec)
858 
#define TARGET_BACKEND_DATA             & nlm32_alpha_backend
859 
 
860 
#include "nlm-target.h"

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